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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 | |
1a981360 | 72 | |
db0dfaa0 LM |
73 | /* Some targets did not define these ptrace constants from the start, |
74 | so gdbserver defines them locally here. In the future, these may | |
75 | be removed after they are added to asm/ptrace.h. */ | |
76 | #if !(defined(PT_TEXT_ADDR) \ | |
77 | || defined(PT_DATA_ADDR) \ | |
78 | || defined(PT_TEXT_END_ADDR)) | |
79 | #if defined(__mcoldfire__) | |
80 | /* These are still undefined in 3.10 kernels. */ | |
81 | #define PT_TEXT_ADDR 49*4 | |
82 | #define PT_DATA_ADDR 50*4 | |
83 | #define PT_TEXT_END_ADDR 51*4 | |
84 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
85 | #elif defined(BFIN) | |
86 | #define PT_TEXT_ADDR 220 | |
87 | #define PT_TEXT_END_ADDR 224 | |
88 | #define PT_DATA_ADDR 228 | |
89 | /* These are still undefined in 3.10 kernels. */ | |
90 | #elif defined(__TMS320C6X__) | |
91 | #define PT_TEXT_ADDR (0x10000*4) | |
92 | #define PT_DATA_ADDR (0x10004*4) | |
93 | #define PT_TEXT_END_ADDR (0x10008*4) | |
94 | #endif | |
95 | #endif | |
96 | ||
9accd112 | 97 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 98 | # include "nat/linux-btrace.h" |
734b0e4b | 99 | # include "btrace-common.h" |
9accd112 MM |
100 | #endif |
101 | ||
8365dcf5 TJB |
102 | #ifndef HAVE_ELF32_AUXV_T |
103 | /* Copied from glibc's elf.h. */ | |
104 | typedef struct | |
105 | { | |
106 | uint32_t a_type; /* Entry type */ | |
107 | union | |
108 | { | |
109 | uint32_t a_val; /* Integer value */ | |
110 | /* We use to have pointer elements added here. We cannot do that, | |
111 | though, since it does not work when using 32-bit definitions | |
112 | on 64-bit platforms and vice versa. */ | |
113 | } a_un; | |
114 | } Elf32_auxv_t; | |
115 | #endif | |
116 | ||
117 | #ifndef HAVE_ELF64_AUXV_T | |
118 | /* Copied from glibc's elf.h. */ | |
119 | typedef struct | |
120 | { | |
121 | uint64_t a_type; /* Entry type */ | |
122 | union | |
123 | { | |
124 | uint64_t a_val; /* Integer value */ | |
125 | /* We use to have pointer elements added here. We cannot do that, | |
126 | though, since it does not work when using 32-bit definitions | |
127 | on 64-bit platforms and vice versa. */ | |
128 | } a_un; | |
129 | } Elf64_auxv_t; | |
130 | #endif | |
131 | ||
ded48a5e YQ |
132 | /* Does the current host support PTRACE_GETREGSET? */ |
133 | int have_ptrace_getregset = -1; | |
134 | ||
cff068da GB |
135 | /* LWP accessors. */ |
136 | ||
137 | /* See nat/linux-nat.h. */ | |
138 | ||
139 | ptid_t | |
140 | ptid_of_lwp (struct lwp_info *lwp) | |
141 | { | |
142 | return ptid_of (get_lwp_thread (lwp)); | |
143 | } | |
144 | ||
145 | /* See nat/linux-nat.h. */ | |
146 | ||
4b134ca1 GB |
147 | void |
148 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
149 | struct arch_lwp_info *info) | |
150 | { | |
151 | lwp->arch_private = info; | |
152 | } | |
153 | ||
154 | /* See nat/linux-nat.h. */ | |
155 | ||
156 | struct arch_lwp_info * | |
157 | lwp_arch_private_info (struct lwp_info *lwp) | |
158 | { | |
159 | return lwp->arch_private; | |
160 | } | |
161 | ||
162 | /* See nat/linux-nat.h. */ | |
163 | ||
cff068da GB |
164 | int |
165 | lwp_is_stopped (struct lwp_info *lwp) | |
166 | { | |
167 | return lwp->stopped; | |
168 | } | |
169 | ||
170 | /* See nat/linux-nat.h. */ | |
171 | ||
172 | enum target_stop_reason | |
173 | lwp_stop_reason (struct lwp_info *lwp) | |
174 | { | |
175 | return lwp->stop_reason; | |
176 | } | |
177 | ||
05044653 PA |
178 | /* A list of all unknown processes which receive stop signals. Some |
179 | other process will presumably claim each of these as forked | |
180 | children momentarily. */ | |
24a09b5f | 181 | |
05044653 PA |
182 | struct simple_pid_list |
183 | { | |
184 | /* The process ID. */ | |
185 | int pid; | |
186 | ||
187 | /* The status as reported by waitpid. */ | |
188 | int status; | |
189 | ||
190 | /* Next in chain. */ | |
191 | struct simple_pid_list *next; | |
192 | }; | |
193 | struct simple_pid_list *stopped_pids; | |
194 | ||
195 | /* Trivial list manipulation functions to keep track of a list of new | |
196 | stopped processes. */ | |
197 | ||
198 | static void | |
199 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
200 | { | |
8d749320 | 201 | struct simple_pid_list *new_pid = XNEW (struct simple_pid_list); |
05044653 PA |
202 | |
203 | new_pid->pid = pid; | |
204 | new_pid->status = status; | |
205 | new_pid->next = *listp; | |
206 | *listp = new_pid; | |
207 | } | |
208 | ||
209 | static int | |
210 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
211 | { | |
212 | struct simple_pid_list **p; | |
213 | ||
214 | for (p = listp; *p != NULL; p = &(*p)->next) | |
215 | if ((*p)->pid == pid) | |
216 | { | |
217 | struct simple_pid_list *next = (*p)->next; | |
218 | ||
219 | *statusp = (*p)->status; | |
220 | xfree (*p); | |
221 | *p = next; | |
222 | return 1; | |
223 | } | |
224 | return 0; | |
225 | } | |
24a09b5f | 226 | |
bde24c0a PA |
227 | enum stopping_threads_kind |
228 | { | |
229 | /* Not stopping threads presently. */ | |
230 | NOT_STOPPING_THREADS, | |
231 | ||
232 | /* Stopping threads. */ | |
233 | STOPPING_THREADS, | |
234 | ||
235 | /* Stopping and suspending threads. */ | |
236 | STOPPING_AND_SUSPENDING_THREADS | |
237 | }; | |
238 | ||
239 | /* This is set while stop_all_lwps is in effect. */ | |
240 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
241 | |
242 | /* FIXME make into a target method? */ | |
24a09b5f | 243 | int using_threads = 1; |
24a09b5f | 244 | |
fa593d66 PA |
245 | /* True if we're presently stabilizing threads (moving them out of |
246 | jump pads). */ | |
247 | static int stabilizing_threads; | |
248 | ||
2acc282a | 249 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 250 | int step, int signal, siginfo_t *info); |
2bd7c093 | 251 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
252 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
253 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
fa96cb38 PA |
254 | static int linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
255 | int *wstat, int options); | |
95954743 | 256 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
b3312d80 | 257 | static struct lwp_info *add_lwp (ptid_t ptid); |
94585166 | 258 | static void linux_mourn (struct process_info *process); |
c35fafde | 259 | static int linux_stopped_by_watchpoint (void); |
95954743 | 260 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
00db26fa | 261 | static int lwp_is_marked_dead (struct lwp_info *lwp); |
d50171e4 | 262 | static void proceed_all_lwps (void); |
d50171e4 | 263 | static int finish_step_over (struct lwp_info *lwp); |
d50171e4 | 264 | static int kill_lwp (unsigned long lwpid, int signo); |
863d01bd PA |
265 | static void enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info); |
266 | static void complete_ongoing_step_over (void); | |
d50171e4 | 267 | |
582511be PA |
268 | /* When the event-loop is doing a step-over, this points at the thread |
269 | being stepped. */ | |
270 | ptid_t step_over_bkpt; | |
271 | ||
d50171e4 PA |
272 | /* True if the low target can hardware single-step. Such targets |
273 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
274 | ||
275 | static int | |
276 | can_hardware_single_step (void) | |
277 | { | |
278 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
279 | } | |
280 | ||
281 | /* True if the low target supports memory breakpoints. If so, we'll | |
282 | have a GET_PC implementation. */ | |
283 | ||
284 | static int | |
285 | supports_breakpoints (void) | |
286 | { | |
287 | return (the_low_target.get_pc != NULL); | |
288 | } | |
0d62e5e8 | 289 | |
fa593d66 PA |
290 | /* Returns true if this target can support fast tracepoints. This |
291 | does not mean that the in-process agent has been loaded in the | |
292 | inferior. */ | |
293 | ||
294 | static int | |
295 | supports_fast_tracepoints (void) | |
296 | { | |
297 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
298 | } | |
299 | ||
c2d6af84 PA |
300 | /* True if LWP is stopped in its stepping range. */ |
301 | ||
302 | static int | |
303 | lwp_in_step_range (struct lwp_info *lwp) | |
304 | { | |
305 | CORE_ADDR pc = lwp->stop_pc; | |
306 | ||
307 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
308 | } | |
309 | ||
0d62e5e8 DJ |
310 | struct pending_signals |
311 | { | |
312 | int signal; | |
32ca6d61 | 313 | siginfo_t info; |
0d62e5e8 DJ |
314 | struct pending_signals *prev; |
315 | }; | |
611cb4a5 | 316 | |
bd99dc85 PA |
317 | /* The read/write ends of the pipe registered as waitable file in the |
318 | event loop. */ | |
319 | static int linux_event_pipe[2] = { -1, -1 }; | |
320 | ||
321 | /* True if we're currently in async mode. */ | |
322 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
323 | ||
02fc4de7 | 324 | static void send_sigstop (struct lwp_info *lwp); |
fa96cb38 | 325 | static void wait_for_sigstop (void); |
bd99dc85 | 326 | |
d0722149 DE |
327 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
328 | ||
329 | static int | |
214d508e | 330 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 331 | { |
214d508e L |
332 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
333 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
334 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
335 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
336 | { | |
337 | *machine = header->e_machine; | |
338 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
339 | ||
340 | } | |
341 | *machine = EM_NONE; | |
342 | return -1; | |
d0722149 DE |
343 | } |
344 | ||
345 | /* Return non-zero if FILE is a 64-bit ELF file, | |
346 | zero if the file is not a 64-bit ELF file, | |
347 | and -1 if the file is not accessible or doesn't exist. */ | |
348 | ||
be07f1a2 | 349 | static int |
214d508e | 350 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 351 | { |
957f3f49 | 352 | Elf64_Ehdr header; |
d0722149 DE |
353 | int fd; |
354 | ||
355 | fd = open (file, O_RDONLY); | |
356 | if (fd < 0) | |
357 | return -1; | |
358 | ||
359 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
360 | { | |
361 | close (fd); | |
362 | return 0; | |
363 | } | |
364 | close (fd); | |
365 | ||
214d508e | 366 | return elf_64_header_p (&header, machine); |
d0722149 DE |
367 | } |
368 | ||
be07f1a2 PA |
369 | /* Accepts an integer PID; Returns true if the executable PID is |
370 | running is a 64-bit ELF file.. */ | |
371 | ||
372 | int | |
214d508e | 373 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 374 | { |
d8d2a3ee | 375 | char file[PATH_MAX]; |
be07f1a2 PA |
376 | |
377 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 378 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
379 | } |
380 | ||
bd99dc85 PA |
381 | static void |
382 | delete_lwp (struct lwp_info *lwp) | |
383 | { | |
fa96cb38 PA |
384 | struct thread_info *thr = get_lwp_thread (lwp); |
385 | ||
386 | if (debug_threads) | |
387 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
388 | ||
389 | remove_thread (thr); | |
aa5ca48f | 390 | free (lwp->arch_private); |
bd99dc85 PA |
391 | free (lwp); |
392 | } | |
393 | ||
95954743 PA |
394 | /* Add a process to the common process list, and set its private |
395 | data. */ | |
396 | ||
397 | static struct process_info * | |
398 | linux_add_process (int pid, int attached) | |
399 | { | |
400 | struct process_info *proc; | |
401 | ||
95954743 | 402 | proc = add_process (pid, attached); |
8d749320 | 403 | proc->priv = XCNEW (struct process_info_private); |
95954743 | 404 | |
aa5ca48f | 405 | if (the_low_target.new_process != NULL) |
fe978cb0 | 406 | proc->priv->arch_private = the_low_target.new_process (); |
aa5ca48f | 407 | |
95954743 PA |
408 | return proc; |
409 | } | |
410 | ||
582511be PA |
411 | static CORE_ADDR get_pc (struct lwp_info *lwp); |
412 | ||
94585166 DB |
413 | /* Implement the arch_setup target_ops method. */ |
414 | ||
415 | static void | |
416 | linux_arch_setup (void) | |
417 | { | |
418 | the_low_target.arch_setup (); | |
419 | } | |
420 | ||
421 | /* Call the target arch_setup function on THREAD. */ | |
422 | ||
423 | static void | |
424 | linux_arch_setup_thread (struct thread_info *thread) | |
425 | { | |
426 | struct thread_info *saved_thread; | |
427 | ||
428 | saved_thread = current_thread; | |
429 | current_thread = thread; | |
430 | ||
431 | linux_arch_setup (); | |
432 | ||
433 | current_thread = saved_thread; | |
434 | } | |
435 | ||
436 | /* Handle a GNU/Linux extended wait response. If we see a clone, | |
437 | fork, or vfork event, we need to add the new LWP to our list | |
438 | (and return 0 so as not to report the trap to higher layers). | |
439 | If we see an exec event, we will modify ORIG_EVENT_LWP to point | |
440 | to a new LWP representing the new program. */ | |
0d62e5e8 | 441 | |
de0d863e | 442 | static int |
94585166 | 443 | handle_extended_wait (struct lwp_info **orig_event_lwp, int wstat) |
24a09b5f | 444 | { |
94585166 | 445 | struct lwp_info *event_lwp = *orig_event_lwp; |
89a5711c | 446 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 447 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
54a0b537 | 448 | struct lwp_info *new_lwp; |
24a09b5f | 449 | |
65706a29 PA |
450 | gdb_assert (event_lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
451 | ||
c269dbdb DB |
452 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
453 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f | 454 | { |
95954743 | 455 | ptid_t ptid; |
24a09b5f | 456 | unsigned long new_pid; |
05044653 | 457 | int ret, status; |
24a09b5f | 458 | |
de0d863e | 459 | /* Get the pid of the new lwp. */ |
d86d4aaf | 460 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 461 | &new_pid); |
24a09b5f DJ |
462 | |
463 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 464 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
465 | { |
466 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
467 | hits the SIGSTOP, but we're already attached. */ | |
468 | ||
97438e3f | 469 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
470 | |
471 | if (ret == -1) | |
472 | perror_with_name ("waiting for new child"); | |
473 | else if (ret != new_pid) | |
474 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 475 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
476 | warning ("wait returned unexpected status 0x%x", status); |
477 | } | |
478 | ||
c269dbdb | 479 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
de0d863e DB |
480 | { |
481 | struct process_info *parent_proc; | |
482 | struct process_info *child_proc; | |
483 | struct lwp_info *child_lwp; | |
bfacd19d | 484 | struct thread_info *child_thr; |
de0d863e DB |
485 | struct target_desc *tdesc; |
486 | ||
487 | ptid = ptid_build (new_pid, new_pid, 0); | |
488 | ||
489 | if (debug_threads) | |
490 | { | |
491 | debug_printf ("HEW: Got fork event from LWP %ld, " | |
492 | "new child is %d\n", | |
493 | ptid_get_lwp (ptid_of (event_thr)), | |
494 | ptid_get_pid (ptid)); | |
495 | } | |
496 | ||
497 | /* Add the new process to the tables and clone the breakpoint | |
498 | lists of the parent. We need to do this even if the new process | |
499 | will be detached, since we will need the process object and the | |
500 | breakpoints to remove any breakpoints from memory when we | |
501 | detach, and the client side will access registers. */ | |
502 | child_proc = linux_add_process (new_pid, 0); | |
503 | gdb_assert (child_proc != NULL); | |
504 | child_lwp = add_lwp (ptid); | |
505 | gdb_assert (child_lwp != NULL); | |
506 | child_lwp->stopped = 1; | |
bfacd19d DB |
507 | child_lwp->must_set_ptrace_flags = 1; |
508 | child_lwp->status_pending_p = 0; | |
509 | child_thr = get_lwp_thread (child_lwp); | |
510 | child_thr->last_resume_kind = resume_stop; | |
998d452a PA |
511 | child_thr->last_status.kind = TARGET_WAITKIND_STOPPED; |
512 | ||
863d01bd PA |
513 | /* If we're suspending all threads, leave this one suspended |
514 | too. */ | |
515 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
516 | { | |
517 | if (debug_threads) | |
518 | debug_printf ("HEW: leaving child suspended\n"); | |
519 | child_lwp->suspended = 1; | |
520 | } | |
521 | ||
de0d863e DB |
522 | parent_proc = get_thread_process (event_thr); |
523 | child_proc->attached = parent_proc->attached; | |
524 | clone_all_breakpoints (&child_proc->breakpoints, | |
525 | &child_proc->raw_breakpoints, | |
526 | parent_proc->breakpoints); | |
527 | ||
8d749320 | 528 | tdesc = XNEW (struct target_desc); |
de0d863e DB |
529 | copy_target_description (tdesc, parent_proc->tdesc); |
530 | child_proc->tdesc = tdesc; | |
de0d863e | 531 | |
3a8a0396 DB |
532 | /* Clone arch-specific process data. */ |
533 | if (the_low_target.new_fork != NULL) | |
534 | the_low_target.new_fork (parent_proc, child_proc); | |
535 | ||
de0d863e | 536 | /* Save fork info in the parent thread. */ |
c269dbdb DB |
537 | if (event == PTRACE_EVENT_FORK) |
538 | event_lwp->waitstatus.kind = TARGET_WAITKIND_FORKED; | |
539 | else if (event == PTRACE_EVENT_VFORK) | |
540 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORKED; | |
541 | ||
de0d863e | 542 | event_lwp->waitstatus.value.related_pid = ptid; |
c269dbdb | 543 | |
de0d863e DB |
544 | /* The status_pending field contains bits denoting the |
545 | extended event, so when the pending event is handled, | |
546 | the handler will look at lwp->waitstatus. */ | |
547 | event_lwp->status_pending_p = 1; | |
548 | event_lwp->status_pending = wstat; | |
549 | ||
550 | /* Report the event. */ | |
551 | return 0; | |
552 | } | |
553 | ||
fa96cb38 PA |
554 | if (debug_threads) |
555 | debug_printf ("HEW: Got clone event " | |
556 | "from LWP %ld, new child is LWP %ld\n", | |
557 | lwpid_of (event_thr), new_pid); | |
558 | ||
d86d4aaf | 559 | ptid = ptid_build (pid_of (event_thr), new_pid, 0); |
b3312d80 | 560 | new_lwp = add_lwp (ptid); |
24a09b5f | 561 | |
e27d73f6 DE |
562 | /* Either we're going to immediately resume the new thread |
563 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
564 | thinks the thread is currently running, so set this first | |
565 | before calling linux_resume_one_lwp. */ | |
566 | new_lwp->stopped = 1; | |
567 | ||
bde24c0a PA |
568 | /* If we're suspending all threads, leave this one suspended |
569 | too. */ | |
570 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
571 | new_lwp->suspended = 1; | |
572 | ||
da5898ce DJ |
573 | /* Normally we will get the pending SIGSTOP. But in some cases |
574 | we might get another signal delivered to the group first. | |
f21cc1a2 | 575 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 576 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 577 | { |
54a0b537 | 578 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
579 | new_lwp->status_pending_p = 1; |
580 | new_lwp->status_pending = status; | |
da5898ce | 581 | } |
65706a29 PA |
582 | else if (report_thread_events) |
583 | { | |
584 | new_lwp->waitstatus.kind = TARGET_WAITKIND_THREAD_CREATED; | |
585 | new_lwp->status_pending_p = 1; | |
586 | new_lwp->status_pending = status; | |
587 | } | |
de0d863e DB |
588 | |
589 | /* Don't report the event. */ | |
590 | return 1; | |
24a09b5f | 591 | } |
c269dbdb DB |
592 | else if (event == PTRACE_EVENT_VFORK_DONE) |
593 | { | |
594 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
595 | ||
596 | /* Report the event. */ | |
597 | return 0; | |
598 | } | |
94585166 DB |
599 | else if (event == PTRACE_EVENT_EXEC && report_exec_events) |
600 | { | |
601 | struct process_info *proc; | |
602 | ptid_t event_ptid; | |
603 | pid_t event_pid; | |
604 | ||
605 | if (debug_threads) | |
606 | { | |
607 | debug_printf ("HEW: Got exec event from LWP %ld\n", | |
608 | lwpid_of (event_thr)); | |
609 | } | |
610 | ||
611 | /* Get the event ptid. */ | |
612 | event_ptid = ptid_of (event_thr); | |
613 | event_pid = ptid_get_pid (event_ptid); | |
614 | ||
615 | /* Delete the execing process and all its threads. */ | |
616 | proc = get_thread_process (event_thr); | |
617 | linux_mourn (proc); | |
618 | current_thread = NULL; | |
619 | ||
620 | /* Create a new process/lwp/thread. */ | |
621 | proc = linux_add_process (event_pid, 0); | |
622 | event_lwp = add_lwp (event_ptid); | |
623 | event_thr = get_lwp_thread (event_lwp); | |
624 | gdb_assert (current_thread == event_thr); | |
625 | linux_arch_setup_thread (event_thr); | |
626 | ||
627 | /* Set the event status. */ | |
628 | event_lwp->waitstatus.kind = TARGET_WAITKIND_EXECD; | |
629 | event_lwp->waitstatus.value.execd_pathname | |
630 | = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr))); | |
631 | ||
632 | /* Mark the exec status as pending. */ | |
633 | event_lwp->stopped = 1; | |
634 | event_lwp->status_pending_p = 1; | |
635 | event_lwp->status_pending = wstat; | |
636 | event_thr->last_resume_kind = resume_continue; | |
637 | event_thr->last_status.kind = TARGET_WAITKIND_IGNORE; | |
638 | ||
639 | /* Report the event. */ | |
640 | *orig_event_lwp = event_lwp; | |
641 | return 0; | |
642 | } | |
de0d863e DB |
643 | |
644 | internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event); | |
24a09b5f DJ |
645 | } |
646 | ||
d50171e4 PA |
647 | /* Return the PC as read from the regcache of LWP, without any |
648 | adjustment. */ | |
649 | ||
650 | static CORE_ADDR | |
651 | get_pc (struct lwp_info *lwp) | |
652 | { | |
0bfdf32f | 653 | struct thread_info *saved_thread; |
d50171e4 PA |
654 | struct regcache *regcache; |
655 | CORE_ADDR pc; | |
656 | ||
657 | if (the_low_target.get_pc == NULL) | |
658 | return 0; | |
659 | ||
0bfdf32f GB |
660 | saved_thread = current_thread; |
661 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 662 | |
0bfdf32f | 663 | regcache = get_thread_regcache (current_thread, 1); |
d50171e4 PA |
664 | pc = (*the_low_target.get_pc) (regcache); |
665 | ||
666 | if (debug_threads) | |
87ce2a04 | 667 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 668 | |
0bfdf32f | 669 | current_thread = saved_thread; |
d50171e4 PA |
670 | return pc; |
671 | } | |
672 | ||
673 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
674 | The SIGTRAP could mean several things. |
675 | ||
676 | On i386, where decr_pc_after_break is non-zero: | |
582511be PA |
677 | |
678 | If we were single-stepping this process using PTRACE_SINGLESTEP, we | |
679 | will get only the one SIGTRAP. The value of $eip will be the next | |
680 | instruction. If the instruction we stepped over was a breakpoint, | |
681 | we need to decrement the PC. | |
682 | ||
0d62e5e8 DJ |
683 | If we continue the process using PTRACE_CONT, we will get a |
684 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
685 | the instruction after the breakpoint (i.e. needs to be | |
686 | decremented). If we report the SIGTRAP to GDB, we must also | |
582511be | 687 | report the undecremented PC. If the breakpoint is removed, we |
0d62e5e8 DJ |
688 | must resume at the decremented PC. |
689 | ||
582511be PA |
690 | On a non-decr_pc_after_break machine with hardware or kernel |
691 | single-step: | |
692 | ||
693 | If we either single-step a breakpoint instruction, or continue and | |
694 | hit a breakpoint instruction, our PC will point at the breakpoint | |
0d62e5e8 DJ |
695 | instruction. */ |
696 | ||
582511be PA |
697 | static int |
698 | check_stopped_by_breakpoint (struct lwp_info *lwp) | |
0d62e5e8 | 699 | { |
582511be PA |
700 | CORE_ADDR pc; |
701 | CORE_ADDR sw_breakpoint_pc; | |
702 | struct thread_info *saved_thread; | |
3e572f71 PA |
703 | #if USE_SIGTRAP_SIGINFO |
704 | siginfo_t siginfo; | |
705 | #endif | |
d50171e4 PA |
706 | |
707 | if (the_low_target.get_pc == NULL) | |
708 | return 0; | |
0d62e5e8 | 709 | |
582511be PA |
710 | pc = get_pc (lwp); |
711 | sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break; | |
d50171e4 | 712 | |
582511be PA |
713 | /* breakpoint_at reads from the current thread. */ |
714 | saved_thread = current_thread; | |
715 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 716 | |
3e572f71 PA |
717 | #if USE_SIGTRAP_SIGINFO |
718 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
719 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
720 | { | |
721 | if (siginfo.si_signo == SIGTRAP) | |
722 | { | |
1db33b5a | 723 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) |
3e572f71 PA |
724 | { |
725 | if (debug_threads) | |
726 | { | |
727 | struct thread_info *thr = get_lwp_thread (lwp); | |
728 | ||
2bf6fb9d | 729 | debug_printf ("CSBB: %s stopped by software breakpoint\n", |
3e572f71 PA |
730 | target_pid_to_str (ptid_of (thr))); |
731 | } | |
732 | ||
733 | /* Back up the PC if necessary. */ | |
734 | if (pc != sw_breakpoint_pc) | |
735 | { | |
736 | struct regcache *regcache | |
737 | = get_thread_regcache (current_thread, 1); | |
738 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
739 | } | |
740 | ||
741 | lwp->stop_pc = sw_breakpoint_pc; | |
742 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
743 | current_thread = saved_thread; | |
744 | return 1; | |
745 | } | |
746 | else if (siginfo.si_code == TRAP_HWBKPT) | |
747 | { | |
748 | if (debug_threads) | |
749 | { | |
750 | struct thread_info *thr = get_lwp_thread (lwp); | |
751 | ||
2bf6fb9d PA |
752 | debug_printf ("CSBB: %s stopped by hardware " |
753 | "breakpoint/watchpoint\n", | |
3e572f71 PA |
754 | target_pid_to_str (ptid_of (thr))); |
755 | } | |
756 | ||
757 | lwp->stop_pc = pc; | |
758 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
759 | current_thread = saved_thread; | |
760 | return 1; | |
761 | } | |
2bf6fb9d PA |
762 | else if (siginfo.si_code == TRAP_TRACE) |
763 | { | |
764 | if (debug_threads) | |
765 | { | |
766 | struct thread_info *thr = get_lwp_thread (lwp); | |
767 | ||
768 | debug_printf ("CSBB: %s stopped by trace\n", | |
769 | target_pid_to_str (ptid_of (thr))); | |
770 | } | |
863d01bd PA |
771 | |
772 | lwp->stop_reason = TARGET_STOPPED_BY_SINGLE_STEP; | |
2bf6fb9d | 773 | } |
3e572f71 PA |
774 | } |
775 | } | |
776 | #else | |
582511be PA |
777 | /* We may have just stepped a breakpoint instruction. E.g., in |
778 | non-stop mode, GDB first tells the thread A to step a range, and | |
779 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
780 | case we need to report the breakpoint PC. */ |
781 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
582511be PA |
782 | && (*the_low_target.breakpoint_at) (sw_breakpoint_pc)) |
783 | { | |
784 | if (debug_threads) | |
785 | { | |
786 | struct thread_info *thr = get_lwp_thread (lwp); | |
787 | ||
788 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
789 | target_pid_to_str (ptid_of (thr))); | |
790 | } | |
791 | ||
792 | /* Back up the PC if necessary. */ | |
793 | if (pc != sw_breakpoint_pc) | |
794 | { | |
795 | struct regcache *regcache | |
796 | = get_thread_regcache (current_thread, 1); | |
797 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
798 | } | |
799 | ||
800 | lwp->stop_pc = sw_breakpoint_pc; | |
15c66dd6 | 801 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
582511be PA |
802 | current_thread = saved_thread; |
803 | return 1; | |
804 | } | |
805 | ||
806 | if (hardware_breakpoint_inserted_here (pc)) | |
807 | { | |
808 | if (debug_threads) | |
809 | { | |
810 | struct thread_info *thr = get_lwp_thread (lwp); | |
811 | ||
812 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
813 | target_pid_to_str (ptid_of (thr))); | |
814 | } | |
47c0c975 | 815 | |
582511be | 816 | lwp->stop_pc = pc; |
15c66dd6 | 817 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; |
582511be PA |
818 | current_thread = saved_thread; |
819 | return 1; | |
820 | } | |
3e572f71 | 821 | #endif |
582511be PA |
822 | |
823 | current_thread = saved_thread; | |
824 | return 0; | |
0d62e5e8 | 825 | } |
ce3a066d | 826 | |
b3312d80 | 827 | static struct lwp_info * |
95954743 | 828 | add_lwp (ptid_t ptid) |
611cb4a5 | 829 | { |
54a0b537 | 830 | struct lwp_info *lwp; |
0d62e5e8 | 831 | |
8d749320 | 832 | lwp = XCNEW (struct lwp_info); |
00db26fa PA |
833 | |
834 | lwp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
0d62e5e8 | 835 | |
aa5ca48f | 836 | if (the_low_target.new_thread != NULL) |
34c703da | 837 | the_low_target.new_thread (lwp); |
aa5ca48f | 838 | |
f7667f0d | 839 | lwp->thread = add_thread (ptid, lwp); |
0d62e5e8 | 840 | |
54a0b537 | 841 | return lwp; |
0d62e5e8 | 842 | } |
611cb4a5 | 843 | |
da6d8c04 DJ |
844 | /* Start an inferior process and returns its pid. |
845 | ALLARGS is a vector of program-name and args. */ | |
846 | ||
ce3a066d DJ |
847 | static int |
848 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 849 | { |
a6dbe5df | 850 | struct lwp_info *new_lwp; |
da6d8c04 | 851 | int pid; |
95954743 | 852 | ptid_t ptid; |
8cc73a39 SDJ |
853 | struct cleanup *restore_personality |
854 | = maybe_disable_address_space_randomization (disable_randomization); | |
03583c20 | 855 | |
42c81e2a | 856 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
857 | pid = vfork (); |
858 | #else | |
da6d8c04 | 859 | pid = fork (); |
52fb6437 | 860 | #endif |
da6d8c04 DJ |
861 | if (pid < 0) |
862 | perror_with_name ("fork"); | |
863 | ||
864 | if (pid == 0) | |
865 | { | |
602e3198 | 866 | close_most_fds (); |
b8e1b30e | 867 | ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da6d8c04 | 868 | |
1a981360 | 869 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 870 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 871 | #endif |
0d62e5e8 | 872 | |
a9fa9f7d DJ |
873 | setpgid (0, 0); |
874 | ||
e0f9f062 DE |
875 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
876 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
877 | Also, redirect stdin to /dev/null. */ | |
878 | if (remote_connection_is_stdio ()) | |
879 | { | |
880 | close (0); | |
881 | open ("/dev/null", O_RDONLY); | |
882 | dup2 (2, 1); | |
3e52c33d JK |
883 | if (write (2, "stdin/stdout redirected\n", |
884 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
885 | { |
886 | /* Errors ignored. */; | |
887 | } | |
e0f9f062 DE |
888 | } |
889 | ||
2b876972 DJ |
890 | execv (program, allargs); |
891 | if (errno == ENOENT) | |
892 | execvp (program, allargs); | |
da6d8c04 DJ |
893 | |
894 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 895 | strerror (errno)); |
da6d8c04 DJ |
896 | fflush (stderr); |
897 | _exit (0177); | |
898 | } | |
899 | ||
8cc73a39 | 900 | do_cleanups (restore_personality); |
03583c20 | 901 | |
55d7b841 | 902 | linux_add_process (pid, 0); |
95954743 PA |
903 | |
904 | ptid = ptid_build (pid, pid, 0); | |
905 | new_lwp = add_lwp (ptid); | |
a6dbe5df | 906 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 907 | |
a9fa9f7d | 908 | return pid; |
da6d8c04 DJ |
909 | } |
910 | ||
8784d563 PA |
911 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
912 | error. */ | |
da6d8c04 | 913 | |
7ae1a6a6 PA |
914 | int |
915 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 916 | { |
54a0b537 | 917 | struct lwp_info *new_lwp; |
7ae1a6a6 | 918 | int lwpid = ptid_get_lwp (ptid); |
611cb4a5 | 919 | |
b8e1b30e | 920 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 921 | != 0) |
7ae1a6a6 | 922 | return errno; |
24a09b5f | 923 | |
b3312d80 | 924 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 925 | |
a6dbe5df PA |
926 | /* We need to wait for SIGSTOP before being able to make the next |
927 | ptrace call on this LWP. */ | |
928 | new_lwp->must_set_ptrace_flags = 1; | |
929 | ||
644cebc9 | 930 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
931 | { |
932 | if (debug_threads) | |
87ce2a04 | 933 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
934 | |
935 | /* The process is definitely stopped. It is in a job control | |
936 | stop, unless the kernel predates the TASK_STOPPED / | |
937 | TASK_TRACED distinction, in which case it might be in a | |
938 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
939 | can kill it, signal it, et cetera. | |
940 | ||
941 | First make sure there is a pending SIGSTOP. Since we are | |
942 | already attached, the process can not transition from stopped | |
943 | to running without a PTRACE_CONT; so we know this signal will | |
944 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
945 | probably already in the queue (unless this kernel is old | |
946 | enough to use TASK_STOPPED for ptrace stops); but since | |
947 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
948 | kill_lwp (lwpid, SIGSTOP); | |
949 | ||
950 | /* Finally, resume the stopped process. This will deliver the | |
951 | SIGSTOP (or a higher priority signal, just like normal | |
952 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 953 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
954 | } |
955 | ||
0d62e5e8 | 956 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
957 | brings it to a halt. |
958 | ||
959 | There are several cases to consider here: | |
960 | ||
961 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 962 | of a new thread that is being created. |
d50171e4 PA |
963 | In this case we should ignore that SIGSTOP and resume the |
964 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 965 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 966 | resume_continue. |
0e21c1ec DE |
967 | |
968 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
969 | to it via attach_inferior. |
970 | In this case we want the process thread to stop. | |
d50171e4 PA |
971 | This is handled by having linux_attach set last_resume_kind == |
972 | resume_stop after we return. | |
e3deef73 LM |
973 | |
974 | If the pid we are attaching to is also the tgid, we attach to and | |
975 | stop all the existing threads. Otherwise, we attach to pid and | |
976 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
977 | |
978 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
979 | existing threads. |
980 | In this case we want the thread to stop. | |
981 | FIXME: This case is currently not properly handled. | |
982 | We should wait for the SIGSTOP but don't. Things work apparently | |
983 | because enough time passes between when we ptrace (ATTACH) and when | |
984 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
985 | |
986 | On the other hand, if we are currently trying to stop all threads, we | |
987 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 988 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
989 | end of the list, and so the new thread has not yet reached |
990 | wait_for_sigstop (but will). */ | |
d50171e4 | 991 | new_lwp->stop_expected = 1; |
0d62e5e8 | 992 | |
7ae1a6a6 | 993 | return 0; |
95954743 PA |
994 | } |
995 | ||
8784d563 PA |
996 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
997 | already attached. Returns true if a new LWP is found, false | |
998 | otherwise. */ | |
999 | ||
1000 | static int | |
1001 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1002 | { | |
1003 | /* Is this a new thread? */ | |
1004 | if (find_thread_ptid (ptid) == NULL) | |
1005 | { | |
1006 | int lwpid = ptid_get_lwp (ptid); | |
1007 | int err; | |
1008 | ||
1009 | if (debug_threads) | |
1010 | debug_printf ("Found new lwp %d\n", lwpid); | |
1011 | ||
1012 | err = linux_attach_lwp (ptid); | |
1013 | ||
1014 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
1015 | is returned if the thread's task still exists, and is marked | |
1016 | as exited or zombie, as well as other conditions, so in that | |
1017 | case, confirm the status in /proc/PID/status. */ | |
1018 | if (err == ESRCH | |
1019 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
1020 | { | |
1021 | if (debug_threads) | |
1022 | { | |
1023 | debug_printf ("Cannot attach to lwp %d: " | |
1024 | "thread is gone (%d: %s)\n", | |
1025 | lwpid, err, strerror (err)); | |
1026 | } | |
1027 | } | |
1028 | else if (err != 0) | |
1029 | { | |
1030 | warning (_("Cannot attach to lwp %d: %s"), | |
1031 | lwpid, | |
1032 | linux_ptrace_attach_fail_reason_string (ptid, err)); | |
1033 | } | |
1034 | ||
1035 | return 1; | |
1036 | } | |
1037 | return 0; | |
1038 | } | |
1039 | ||
500c1d85 PA |
1040 | static void async_file_mark (void); |
1041 | ||
e3deef73 LM |
1042 | /* Attach to PID. If PID is the tgid, attach to it and all |
1043 | of its threads. */ | |
1044 | ||
c52daf70 | 1045 | static int |
a1928bad | 1046 | linux_attach (unsigned long pid) |
0d62e5e8 | 1047 | { |
500c1d85 PA |
1048 | struct process_info *proc; |
1049 | struct thread_info *initial_thread; | |
7ae1a6a6 PA |
1050 | ptid_t ptid = ptid_build (pid, pid, 0); |
1051 | int err; | |
1052 | ||
e3deef73 LM |
1053 | /* Attach to PID. We will check for other threads |
1054 | soon. */ | |
7ae1a6a6 PA |
1055 | err = linux_attach_lwp (ptid); |
1056 | if (err != 0) | |
1057 | error ("Cannot attach to process %ld: %s", | |
8784d563 | 1058 | pid, linux_ptrace_attach_fail_reason_string (ptid, err)); |
7ae1a6a6 | 1059 | |
500c1d85 | 1060 | proc = linux_add_process (pid, 1); |
0d62e5e8 | 1061 | |
500c1d85 PA |
1062 | /* Don't ignore the initial SIGSTOP if we just attached to this |
1063 | process. It will be collected by wait shortly. */ | |
1064 | initial_thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
1065 | initial_thread->last_resume_kind = resume_stop; | |
0d62e5e8 | 1066 | |
8784d563 PA |
1067 | /* We must attach to every LWP. If /proc is mounted, use that to |
1068 | find them now. On the one hand, the inferior may be using raw | |
1069 | clone instead of using pthreads. On the other hand, even if it | |
1070 | is using pthreads, GDB may not be connected yet (thread_db needs | |
1071 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
1072 | structures in the inferior's address space to find the list of | |
1073 | threads/LWPs, and those structures may well be corrupted. Note | |
1074 | that once thread_db is loaded, we'll still use it to list threads | |
1075 | and associate pthread info with each LWP. */ | |
1076 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
500c1d85 PA |
1077 | |
1078 | /* GDB will shortly read the xml target description for this | |
1079 | process, to figure out the process' architecture. But the target | |
1080 | description is only filled in when the first process/thread in | |
1081 | the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do | |
1082 | that now, otherwise, if GDB is fast enough, it could read the | |
1083 | target description _before_ that initial stop. */ | |
1084 | if (non_stop) | |
1085 | { | |
1086 | struct lwp_info *lwp; | |
1087 | int wstat, lwpid; | |
1088 | ptid_t pid_ptid = pid_to_ptid (pid); | |
1089 | ||
1090 | lwpid = linux_wait_for_event_filtered (pid_ptid, pid_ptid, | |
1091 | &wstat, __WALL); | |
1092 | gdb_assert (lwpid > 0); | |
1093 | ||
1094 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); | |
1095 | ||
1096 | if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGSTOP) | |
1097 | { | |
1098 | lwp->status_pending_p = 1; | |
1099 | lwp->status_pending = wstat; | |
1100 | } | |
1101 | ||
1102 | initial_thread->last_resume_kind = resume_continue; | |
1103 | ||
1104 | async_file_mark (); | |
1105 | ||
1106 | gdb_assert (proc->tdesc != NULL); | |
1107 | } | |
1108 | ||
95954743 PA |
1109 | return 0; |
1110 | } | |
1111 | ||
1112 | struct counter | |
1113 | { | |
1114 | int pid; | |
1115 | int count; | |
1116 | }; | |
1117 | ||
1118 | static int | |
1119 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
1120 | { | |
9a3c8263 | 1121 | struct counter *counter = (struct counter *) args; |
95954743 PA |
1122 | |
1123 | if (ptid_get_pid (entry->id) == counter->pid) | |
1124 | { | |
1125 | if (++counter->count > 1) | |
1126 | return 1; | |
1127 | } | |
d61ddec4 | 1128 | |
da6d8c04 DJ |
1129 | return 0; |
1130 | } | |
1131 | ||
95954743 | 1132 | static int |
fa96cb38 | 1133 | last_thread_of_process_p (int pid) |
95954743 | 1134 | { |
95954743 | 1135 | struct counter counter = { pid , 0 }; |
da6d8c04 | 1136 | |
95954743 PA |
1137 | return (find_inferior (&all_threads, |
1138 | second_thread_of_pid_p, &counter) == NULL); | |
1139 | } | |
1140 | ||
da84f473 PA |
1141 | /* Kill LWP. */ |
1142 | ||
1143 | static void | |
1144 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1145 | { | |
d86d4aaf DE |
1146 | struct thread_info *thr = get_lwp_thread (lwp); |
1147 | int pid = lwpid_of (thr); | |
da84f473 PA |
1148 | |
1149 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1150 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1151 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1152 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1153 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1154 | per process, not one for each thread. But since we still support | |
1155 | linuxthreads, and we also support debugging programs using raw | |
1156 | clone without CLONE_THREAD, we send one for each thread. For | |
1157 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
1158 | about some old kernels where PTRACE_KILL might work better | |
1159 | (dubious if there are any such, but that's why it's paranoia), so | |
1160 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
1161 | everywhere. */ | |
1162 | ||
1163 | errno = 0; | |
69ff6be5 | 1164 | kill_lwp (pid, SIGKILL); |
da84f473 | 1165 | if (debug_threads) |
ce9e3fe7 PA |
1166 | { |
1167 | int save_errno = errno; | |
1168 | ||
1169 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
1170 | target_pid_to_str (ptid_of (thr)), | |
1171 | save_errno ? strerror (save_errno) : "OK"); | |
1172 | } | |
da84f473 PA |
1173 | |
1174 | errno = 0; | |
b8e1b30e | 1175 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1176 | if (debug_threads) |
ce9e3fe7 PA |
1177 | { |
1178 | int save_errno = errno; | |
1179 | ||
1180 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
1181 | target_pid_to_str (ptid_of (thr)), | |
1182 | save_errno ? strerror (save_errno) : "OK"); | |
1183 | } | |
da84f473 PA |
1184 | } |
1185 | ||
e76126e8 PA |
1186 | /* Kill LWP and wait for it to die. */ |
1187 | ||
1188 | static void | |
1189 | kill_wait_lwp (struct lwp_info *lwp) | |
1190 | { | |
1191 | struct thread_info *thr = get_lwp_thread (lwp); | |
1192 | int pid = ptid_get_pid (ptid_of (thr)); | |
1193 | int lwpid = ptid_get_lwp (ptid_of (thr)); | |
1194 | int wstat; | |
1195 | int res; | |
1196 | ||
1197 | if (debug_threads) | |
1198 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
1199 | ||
1200 | do | |
1201 | { | |
1202 | linux_kill_one_lwp (lwp); | |
1203 | ||
1204 | /* Make sure it died. Notes: | |
1205 | ||
1206 | - The loop is most likely unnecessary. | |
1207 | ||
1208 | - We don't use linux_wait_for_event as that could delete lwps | |
1209 | while we're iterating over them. We're not interested in | |
1210 | any pending status at this point, only in making sure all | |
1211 | wait status on the kernel side are collected until the | |
1212 | process is reaped. | |
1213 | ||
1214 | - We don't use __WALL here as the __WALL emulation relies on | |
1215 | SIGCHLD, and killing a stopped process doesn't generate | |
1216 | one, nor an exit status. | |
1217 | */ | |
1218 | res = my_waitpid (lwpid, &wstat, 0); | |
1219 | if (res == -1 && errno == ECHILD) | |
1220 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1221 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1222 | ||
586b02a9 PA |
1223 | /* Even if it was stopped, the child may have already disappeared. |
1224 | E.g., if it was killed by SIGKILL. */ | |
1225 | if (res < 0 && errno != ECHILD) | |
1226 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1227 | } |
1228 | ||
da84f473 PA |
1229 | /* Callback for `find_inferior'. Kills an lwp of a given process, |
1230 | except the leader. */ | |
95954743 PA |
1231 | |
1232 | static int | |
da84f473 | 1233 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 1234 | { |
0d62e5e8 | 1235 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 1236 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
1237 | int pid = * (int *) args; |
1238 | ||
1239 | if (ptid_get_pid (entry->id) != pid) | |
1240 | return 0; | |
0d62e5e8 | 1241 | |
fd500816 DJ |
1242 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1243 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1244 | the children get a chance to be reaped, it will remain a zombie | |
1245 | forever. */ | |
95954743 | 1246 | |
d86d4aaf | 1247 | if (lwpid_of (thread) == pid) |
95954743 PA |
1248 | { |
1249 | if (debug_threads) | |
87ce2a04 DE |
1250 | debug_printf ("lkop: is last of process %s\n", |
1251 | target_pid_to_str (entry->id)); | |
95954743 PA |
1252 | return 0; |
1253 | } | |
fd500816 | 1254 | |
e76126e8 | 1255 | kill_wait_lwp (lwp); |
95954743 | 1256 | return 0; |
da6d8c04 DJ |
1257 | } |
1258 | ||
95954743 PA |
1259 | static int |
1260 | linux_kill (int pid) | |
0d62e5e8 | 1261 | { |
95954743 | 1262 | struct process_info *process; |
54a0b537 | 1263 | struct lwp_info *lwp; |
fd500816 | 1264 | |
95954743 PA |
1265 | process = find_process_pid (pid); |
1266 | if (process == NULL) | |
1267 | return -1; | |
9d606399 | 1268 | |
f9e39928 PA |
1269 | /* If we're killing a running inferior, make sure it is stopped |
1270 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1271 | stop_all_lwps (0, NULL); |
f9e39928 | 1272 | |
da84f473 | 1273 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1274 | |
54a0b537 | 1275 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1276 | thread in the list, so do so now. */ |
95954743 | 1277 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1278 | |
784867a5 | 1279 | if (lwp == NULL) |
fd500816 | 1280 | { |
784867a5 | 1281 | if (debug_threads) |
d86d4aaf DE |
1282 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1283 | pid); | |
784867a5 JK |
1284 | } |
1285 | else | |
e76126e8 | 1286 | kill_wait_lwp (lwp); |
2d717e4f | 1287 | |
8336d594 | 1288 | the_target->mourn (process); |
f9e39928 PA |
1289 | |
1290 | /* Since we presently can only stop all lwps of all processes, we | |
1291 | need to unstop lwps of other processes. */ | |
7984d532 | 1292 | unstop_all_lwps (0, NULL); |
95954743 | 1293 | return 0; |
0d62e5e8 DJ |
1294 | } |
1295 | ||
9b224c5e PA |
1296 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1297 | signal the thread last stopped for, which we need to deliver to the | |
1298 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1299 | ||
1300 | static int | |
1301 | get_detach_signal (struct thread_info *thread) | |
1302 | { | |
a493e3e2 | 1303 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1304 | int status; |
1305 | struct lwp_info *lp = get_thread_lwp (thread); | |
1306 | ||
1307 | if (lp->status_pending_p) | |
1308 | status = lp->status_pending; | |
1309 | else | |
1310 | { | |
1311 | /* If the thread had been suspended by gdbserver, and it stopped | |
1312 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1313 | want to deliver that SIGSTOP. */ | |
1314 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1315 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1316 | return 0; |
1317 | ||
1318 | /* Otherwise, we may need to deliver the signal we | |
1319 | intercepted. */ | |
1320 | status = lp->last_status; | |
1321 | } | |
1322 | ||
1323 | if (!WIFSTOPPED (status)) | |
1324 | { | |
1325 | if (debug_threads) | |
87ce2a04 | 1326 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1327 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1328 | return 0; |
1329 | } | |
1330 | ||
1331 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1332 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1333 | { |
1334 | if (debug_threads) | |
87ce2a04 DE |
1335 | debug_printf ("GPS: lwp %s had stopped with extended " |
1336 | "status: no pending signal\n", | |
d86d4aaf | 1337 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1338 | return 0; |
1339 | } | |
1340 | ||
2ea28649 | 1341 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1342 | |
1343 | if (program_signals_p && !program_signals[signo]) | |
1344 | { | |
1345 | if (debug_threads) | |
87ce2a04 | 1346 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1347 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1348 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1349 | return 0; |
1350 | } | |
1351 | else if (!program_signals_p | |
1352 | /* If we have no way to know which signals GDB does not | |
1353 | want to have passed to the program, assume | |
1354 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1355 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1356 | { |
1357 | if (debug_threads) | |
87ce2a04 DE |
1358 | debug_printf ("GPS: lwp %s had signal %s, " |
1359 | "but we don't know if we should pass it. " | |
1360 | "Default to not.\n", | |
d86d4aaf | 1361 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1362 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1363 | return 0; |
1364 | } | |
1365 | else | |
1366 | { | |
1367 | if (debug_threads) | |
87ce2a04 | 1368 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1369 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1370 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1371 | |
1372 | return WSTOPSIG (status); | |
1373 | } | |
1374 | } | |
1375 | ||
95954743 PA |
1376 | static int |
1377 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1378 | { |
1379 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1380 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1381 | int pid = * (int *) args; |
9b224c5e | 1382 | int sig; |
95954743 PA |
1383 | |
1384 | if (ptid_get_pid (entry->id) != pid) | |
1385 | return 0; | |
6ad8ae5c | 1386 | |
9b224c5e | 1387 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1388 | if (lwp->stop_expected) |
ae13219e | 1389 | { |
9b224c5e | 1390 | if (debug_threads) |
87ce2a04 | 1391 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1392 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1393 | |
d86d4aaf | 1394 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1395 | lwp->stop_expected = 0; |
ae13219e DJ |
1396 | } |
1397 | ||
1398 | /* Flush any pending changes to the process's registers. */ | |
d86d4aaf | 1399 | regcache_invalidate_thread (thread); |
ae13219e | 1400 | |
9b224c5e PA |
1401 | /* Pass on any pending signal for this thread. */ |
1402 | sig = get_detach_signal (thread); | |
1403 | ||
ae13219e | 1404 | /* Finally, let it resume. */ |
82bfbe7e PA |
1405 | if (the_low_target.prepare_to_resume != NULL) |
1406 | the_low_target.prepare_to_resume (lwp); | |
d86d4aaf | 1407 | if (ptrace (PTRACE_DETACH, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
b8e1b30e | 1408 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
9b224c5e | 1409 | error (_("Can't detach %s: %s"), |
d86d4aaf | 1410 | target_pid_to_str (ptid_of (thread)), |
9b224c5e | 1411 | strerror (errno)); |
bd99dc85 PA |
1412 | |
1413 | delete_lwp (lwp); | |
95954743 | 1414 | return 0; |
6ad8ae5c DJ |
1415 | } |
1416 | ||
95954743 PA |
1417 | static int |
1418 | linux_detach (int pid) | |
1419 | { | |
1420 | struct process_info *process; | |
1421 | ||
1422 | process = find_process_pid (pid); | |
1423 | if (process == NULL) | |
1424 | return -1; | |
1425 | ||
863d01bd PA |
1426 | /* As there's a step over already in progress, let it finish first, |
1427 | otherwise nesting a stabilize_threads operation on top gets real | |
1428 | messy. */ | |
1429 | complete_ongoing_step_over (); | |
1430 | ||
f9e39928 PA |
1431 | /* Stop all threads before detaching. First, ptrace requires that |
1432 | the thread is stopped to sucessfully detach. Second, thread_db | |
1433 | may need to uninstall thread event breakpoints from memory, which | |
1434 | only works with a stopped process anyway. */ | |
7984d532 | 1435 | stop_all_lwps (0, NULL); |
f9e39928 | 1436 | |
ca5c370d | 1437 | #ifdef USE_THREAD_DB |
8336d594 | 1438 | thread_db_detach (process); |
ca5c370d PA |
1439 | #endif |
1440 | ||
fa593d66 PA |
1441 | /* Stabilize threads (move out of jump pads). */ |
1442 | stabilize_threads (); | |
1443 | ||
95954743 | 1444 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1445 | |
1446 | the_target->mourn (process); | |
f9e39928 PA |
1447 | |
1448 | /* Since we presently can only stop all lwps of all processes, we | |
1449 | need to unstop lwps of other processes. */ | |
7984d532 | 1450 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1451 | return 0; |
1452 | } | |
1453 | ||
1454 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1455 | ||
1456 | static int | |
1457 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1458 | { | |
d86d4aaf DE |
1459 | struct thread_info *thread = (struct thread_info *) entry; |
1460 | struct lwp_info *lwp = get_thread_lwp (thread); | |
9a3c8263 | 1461 | struct process_info *process = (struct process_info *) proc; |
f9e39928 | 1462 | |
d86d4aaf | 1463 | if (pid_of (thread) == pid_of (process)) |
f9e39928 PA |
1464 | delete_lwp (lwp); |
1465 | ||
dd6953e1 | 1466 | return 0; |
6ad8ae5c DJ |
1467 | } |
1468 | ||
8336d594 PA |
1469 | static void |
1470 | linux_mourn (struct process_info *process) | |
1471 | { | |
1472 | struct process_info_private *priv; | |
1473 | ||
1474 | #ifdef USE_THREAD_DB | |
1475 | thread_db_mourn (process); | |
1476 | #endif | |
1477 | ||
d86d4aaf | 1478 | find_inferior (&all_threads, delete_lwp_callback, process); |
f9e39928 | 1479 | |
8336d594 | 1480 | /* Freeing all private data. */ |
fe978cb0 | 1481 | priv = process->priv; |
8336d594 PA |
1482 | free (priv->arch_private); |
1483 | free (priv); | |
fe978cb0 | 1484 | process->priv = NULL; |
505106cd PA |
1485 | |
1486 | remove_process (process); | |
8336d594 PA |
1487 | } |
1488 | ||
444d6139 | 1489 | static void |
95954743 | 1490 | linux_join (int pid) |
444d6139 | 1491 | { |
444d6139 PA |
1492 | int status, ret; |
1493 | ||
1494 | do { | |
95954743 | 1495 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1496 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1497 | break; | |
1498 | } while (ret != -1 || errno != ECHILD); | |
1499 | } | |
1500 | ||
6ad8ae5c | 1501 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1502 | static int |
95954743 | 1503 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1504 | { |
95954743 PA |
1505 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1506 | ||
1507 | /* We assume we always know if a thread exits. If a whole process | |
1508 | exited but we still haven't been able to report it to GDB, we'll | |
1509 | hold on to the last lwp of the dead process. */ | |
1510 | if (lwp != NULL) | |
00db26fa | 1511 | return !lwp_is_marked_dead (lwp); |
0d62e5e8 DJ |
1512 | else |
1513 | return 0; | |
1514 | } | |
1515 | ||
582511be PA |
1516 | /* Return 1 if this lwp still has an interesting status pending. If |
1517 | not (e.g., it had stopped for a breakpoint that is gone), return | |
1518 | false. */ | |
1519 | ||
1520 | static int | |
1521 | thread_still_has_status_pending_p (struct thread_info *thread) | |
1522 | { | |
1523 | struct lwp_info *lp = get_thread_lwp (thread); | |
1524 | ||
1525 | if (!lp->status_pending_p) | |
1526 | return 0; | |
1527 | ||
582511be | 1528 | if (thread->last_resume_kind != resume_stop |
15c66dd6 PA |
1529 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1530 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1531 | { |
1532 | struct thread_info *saved_thread; | |
1533 | CORE_ADDR pc; | |
1534 | int discard = 0; | |
1535 | ||
1536 | gdb_assert (lp->last_status != 0); | |
1537 | ||
1538 | pc = get_pc (lp); | |
1539 | ||
1540 | saved_thread = current_thread; | |
1541 | current_thread = thread; | |
1542 | ||
1543 | if (pc != lp->stop_pc) | |
1544 | { | |
1545 | if (debug_threads) | |
1546 | debug_printf ("PC of %ld changed\n", | |
1547 | lwpid_of (thread)); | |
1548 | discard = 1; | |
1549 | } | |
3e572f71 PA |
1550 | |
1551 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1552 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
582511be PA |
1553 | && !(*the_low_target.breakpoint_at) (pc)) |
1554 | { | |
1555 | if (debug_threads) | |
1556 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1557 | lwpid_of (thread)); | |
1558 | discard = 1; | |
1559 | } | |
15c66dd6 | 1560 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1561 | && !hardware_breakpoint_inserted_here (pc)) |
1562 | { | |
1563 | if (debug_threads) | |
1564 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1565 | lwpid_of (thread)); | |
1566 | discard = 1; | |
1567 | } | |
3e572f71 | 1568 | #endif |
582511be PA |
1569 | |
1570 | current_thread = saved_thread; | |
1571 | ||
1572 | if (discard) | |
1573 | { | |
1574 | if (debug_threads) | |
1575 | debug_printf ("discarding pending breakpoint status\n"); | |
1576 | lp->status_pending_p = 0; | |
1577 | return 0; | |
1578 | } | |
1579 | } | |
1580 | ||
1581 | return 1; | |
1582 | } | |
1583 | ||
a681f9c9 PA |
1584 | /* Returns true if LWP is resumed from the client's perspective. */ |
1585 | ||
1586 | static int | |
1587 | lwp_resumed (struct lwp_info *lwp) | |
1588 | { | |
1589 | struct thread_info *thread = get_lwp_thread (lwp); | |
1590 | ||
1591 | if (thread->last_resume_kind != resume_stop) | |
1592 | return 1; | |
1593 | ||
1594 | /* Did gdb send us a `vCont;t', but we haven't reported the | |
1595 | corresponding stop to gdb yet? If so, the thread is still | |
1596 | resumed/running from gdb's perspective. */ | |
1597 | if (thread->last_resume_kind == resume_stop | |
1598 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
1599 | return 1; | |
1600 | ||
1601 | return 0; | |
1602 | } | |
1603 | ||
6bf5e0ba | 1604 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1605 | static int |
d50171e4 | 1606 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1607 | { |
d86d4aaf | 1608 | struct thread_info *thread = (struct thread_info *) entry; |
582511be | 1609 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1610 | ptid_t ptid = * (ptid_t *) arg; |
1611 | ||
1612 | /* Check if we're only interested in events from a specific process | |
afa8d396 PA |
1613 | or a specific LWP. */ |
1614 | if (!ptid_match (ptid_of (thread), ptid)) | |
95954743 | 1615 | return 0; |
0d62e5e8 | 1616 | |
a681f9c9 PA |
1617 | if (!lwp_resumed (lp)) |
1618 | return 0; | |
1619 | ||
582511be PA |
1620 | if (lp->status_pending_p |
1621 | && !thread_still_has_status_pending_p (thread)) | |
1622 | { | |
1623 | linux_resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); | |
1624 | return 0; | |
1625 | } | |
0d62e5e8 | 1626 | |
582511be | 1627 | return lp->status_pending_p; |
0d62e5e8 DJ |
1628 | } |
1629 | ||
95954743 PA |
1630 | static int |
1631 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1632 | { | |
1633 | ptid_t ptid = *(ptid_t *) data; | |
1634 | int lwp; | |
1635 | ||
1636 | if (ptid_get_lwp (ptid) != 0) | |
1637 | lwp = ptid_get_lwp (ptid); | |
1638 | else | |
1639 | lwp = ptid_get_pid (ptid); | |
1640 | ||
1641 | if (ptid_get_lwp (entry->id) == lwp) | |
1642 | return 1; | |
1643 | ||
1644 | return 0; | |
1645 | } | |
1646 | ||
1647 | struct lwp_info * | |
1648 | find_lwp_pid (ptid_t ptid) | |
1649 | { | |
d86d4aaf DE |
1650 | struct inferior_list_entry *thread |
1651 | = find_inferior (&all_threads, same_lwp, &ptid); | |
1652 | ||
1653 | if (thread == NULL) | |
1654 | return NULL; | |
1655 | ||
1656 | return get_thread_lwp ((struct thread_info *) thread); | |
95954743 PA |
1657 | } |
1658 | ||
fa96cb38 | 1659 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1660 | |
fa96cb38 PA |
1661 | static int |
1662 | num_lwps (int pid) | |
1663 | { | |
1664 | struct inferior_list_entry *inf, *tmp; | |
1665 | int count = 0; | |
0d62e5e8 | 1666 | |
fa96cb38 | 1667 | ALL_INFERIORS (&all_threads, inf, tmp) |
24a09b5f | 1668 | { |
fa96cb38 PA |
1669 | if (ptid_get_pid (inf->id) == pid) |
1670 | count++; | |
24a09b5f | 1671 | } |
3aee8918 | 1672 | |
fa96cb38 PA |
1673 | return count; |
1674 | } | |
d61ddec4 | 1675 | |
6d4ee8c6 GB |
1676 | /* The arguments passed to iterate_over_lwps. */ |
1677 | ||
1678 | struct iterate_over_lwps_args | |
1679 | { | |
1680 | /* The FILTER argument passed to iterate_over_lwps. */ | |
1681 | ptid_t filter; | |
1682 | ||
1683 | /* The CALLBACK argument passed to iterate_over_lwps. */ | |
1684 | iterate_over_lwps_ftype *callback; | |
1685 | ||
1686 | /* The DATA argument passed to iterate_over_lwps. */ | |
1687 | void *data; | |
1688 | }; | |
1689 | ||
1690 | /* Callback for find_inferior used by iterate_over_lwps to filter | |
1691 | calls to the callback supplied to that function. Returning a | |
1692 | nonzero value causes find_inferiors to stop iterating and return | |
1693 | the current inferior_list_entry. Returning zero indicates that | |
1694 | find_inferiors should continue iterating. */ | |
1695 | ||
1696 | static int | |
1697 | iterate_over_lwps_filter (struct inferior_list_entry *entry, void *args_p) | |
1698 | { | |
1699 | struct iterate_over_lwps_args *args | |
1700 | = (struct iterate_over_lwps_args *) args_p; | |
1701 | ||
1702 | if (ptid_match (entry->id, args->filter)) | |
1703 | { | |
1704 | struct thread_info *thr = (struct thread_info *) entry; | |
1705 | struct lwp_info *lwp = get_thread_lwp (thr); | |
1706 | ||
1707 | return (*args->callback) (lwp, args->data); | |
1708 | } | |
1709 | ||
1710 | return 0; | |
1711 | } | |
1712 | ||
1713 | /* See nat/linux-nat.h. */ | |
1714 | ||
1715 | struct lwp_info * | |
1716 | iterate_over_lwps (ptid_t filter, | |
1717 | iterate_over_lwps_ftype callback, | |
1718 | void *data) | |
1719 | { | |
1720 | struct iterate_over_lwps_args args = {filter, callback, data}; | |
1721 | struct inferior_list_entry *entry; | |
1722 | ||
1723 | entry = find_inferior (&all_threads, iterate_over_lwps_filter, &args); | |
1724 | if (entry == NULL) | |
1725 | return NULL; | |
1726 | ||
1727 | return get_thread_lwp ((struct thread_info *) entry); | |
1728 | } | |
1729 | ||
fa96cb38 PA |
1730 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1731 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1732 | |
fa96cb38 PA |
1733 | static void |
1734 | check_zombie_leaders (void) | |
1735 | { | |
1736 | struct process_info *proc, *tmp; | |
c3adc08c | 1737 | |
fa96cb38 | 1738 | ALL_PROCESSES (proc, tmp) |
c3adc08c | 1739 | { |
fa96cb38 PA |
1740 | pid_t leader_pid = pid_of (proc); |
1741 | struct lwp_info *leader_lp; | |
c3adc08c | 1742 | |
fa96cb38 | 1743 | leader_lp = find_lwp_pid (pid_to_ptid (leader_pid)); |
c3adc08c | 1744 | |
fa96cb38 PA |
1745 | if (debug_threads) |
1746 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1747 | "num_lwps=%d, zombie=%d\n", | |
1748 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1749 | linux_proc_pid_is_zombie (leader_pid)); | |
1750 | ||
94585166 | 1751 | if (leader_lp != NULL && !leader_lp->stopped |
fa96cb38 PA |
1752 | /* Check if there are other threads in the group, as we may |
1753 | have raced with the inferior simply exiting. */ | |
1754 | && !last_thread_of_process_p (leader_pid) | |
1755 | && linux_proc_pid_is_zombie (leader_pid)) | |
1756 | { | |
1757 | /* A leader zombie can mean one of two things: | |
1758 | ||
1759 | - It exited, and there's an exit status pending | |
1760 | available, or only the leader exited (not the whole | |
1761 | program). In the latter case, we can't waitpid the | |
1762 | leader's exit status until all other threads are gone. | |
1763 | ||
1764 | - There are 3 or more threads in the group, and a thread | |
1765 | other than the leader exec'd. On an exec, the Linux | |
1766 | kernel destroys all other threads (except the execing | |
1767 | one) in the thread group, and resets the execing thread's | |
1768 | tid to the tgid. No exit notification is sent for the | |
1769 | execing thread -- from the ptracer's perspective, it | |
1770 | appears as though the execing thread just vanishes. | |
1771 | Until we reap all other threads except the leader and the | |
1772 | execing thread, the leader will be zombie, and the | |
1773 | execing thread will be in `D (disc sleep)'. As soon as | |
1774 | all other threads are reaped, the execing thread changes | |
1775 | it's tid to the tgid, and the previous (zombie) leader | |
1776 | vanishes, giving place to the "new" leader. We could try | |
1777 | distinguishing the exit and exec cases, by waiting once | |
1778 | more, and seeing if something comes out, but it doesn't | |
1779 | sound useful. The previous leader _does_ go away, and | |
1780 | we'll re-add the new one once we see the exec event | |
1781 | (which is just the same as what would happen if the | |
1782 | previous leader did exit voluntarily before some other | |
1783 | thread execs). */ | |
c3adc08c | 1784 | |
fa96cb38 PA |
1785 | if (debug_threads) |
1786 | fprintf (stderr, | |
1787 | "CZL: Thread group leader %d zombie " | |
1788 | "(it exited, or another thread execd).\n", | |
1789 | leader_pid); | |
c3adc08c | 1790 | |
fa96cb38 | 1791 | delete_lwp (leader_lp); |
c3adc08c PA |
1792 | } |
1793 | } | |
fa96cb38 | 1794 | } |
c3adc08c | 1795 | |
fa96cb38 PA |
1796 | /* Callback for `find_inferior'. Returns the first LWP that is not |
1797 | stopped. ARG is a PTID filter. */ | |
d50171e4 | 1798 | |
fa96cb38 PA |
1799 | static int |
1800 | not_stopped_callback (struct inferior_list_entry *entry, void *arg) | |
1801 | { | |
1802 | struct thread_info *thr = (struct thread_info *) entry; | |
1803 | struct lwp_info *lwp; | |
1804 | ptid_t filter = *(ptid_t *) arg; | |
47c0c975 | 1805 | |
fa96cb38 PA |
1806 | if (!ptid_match (ptid_of (thr), filter)) |
1807 | return 0; | |
bd99dc85 | 1808 | |
fa96cb38 PA |
1809 | lwp = get_thread_lwp (thr); |
1810 | if (!lwp->stopped) | |
1811 | return 1; | |
1812 | ||
1813 | return 0; | |
0d62e5e8 | 1814 | } |
611cb4a5 | 1815 | |
863d01bd PA |
1816 | /* Increment LWP's suspend count. */ |
1817 | ||
1818 | static void | |
1819 | lwp_suspended_inc (struct lwp_info *lwp) | |
1820 | { | |
1821 | lwp->suspended++; | |
1822 | ||
1823 | if (debug_threads && lwp->suspended > 4) | |
1824 | { | |
1825 | struct thread_info *thread = get_lwp_thread (lwp); | |
1826 | ||
1827 | debug_printf ("LWP %ld has a suspiciously high suspend count," | |
1828 | " suspended=%d\n", lwpid_of (thread), lwp->suspended); | |
1829 | } | |
1830 | } | |
1831 | ||
1832 | /* Decrement LWP's suspend count. */ | |
1833 | ||
1834 | static void | |
1835 | lwp_suspended_decr (struct lwp_info *lwp) | |
1836 | { | |
1837 | lwp->suspended--; | |
1838 | ||
1839 | if (lwp->suspended < 0) | |
1840 | { | |
1841 | struct thread_info *thread = get_lwp_thread (lwp); | |
1842 | ||
1843 | internal_error (__FILE__, __LINE__, | |
1844 | "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread), | |
1845 | lwp->suspended); | |
1846 | } | |
1847 | } | |
1848 | ||
219f2f23 PA |
1849 | /* This function should only be called if the LWP got a SIGTRAP. |
1850 | ||
1851 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1852 | event was handled, 0 otherwise. */ | |
1853 | ||
1854 | static int | |
1855 | handle_tracepoints (struct lwp_info *lwp) | |
1856 | { | |
1857 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1858 | int tpoint_related_event = 0; | |
1859 | ||
582511be PA |
1860 | gdb_assert (lwp->suspended == 0); |
1861 | ||
7984d532 PA |
1862 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1863 | uninsert tracepoints. To do this, we temporarily pause all | |
1864 | threads, unpatch away, and then unpause threads. We need to make | |
1865 | sure the unpausing doesn't resume LWP too. */ | |
863d01bd | 1866 | lwp_suspended_inc (lwp); |
7984d532 | 1867 | |
219f2f23 PA |
1868 | /* And we need to be sure that any all-threads-stopping doesn't try |
1869 | to move threads out of the jump pads, as it could deadlock the | |
1870 | inferior (LWP could be in the jump pad, maybe even holding the | |
1871 | lock.) */ | |
1872 | ||
1873 | /* Do any necessary step collect actions. */ | |
1874 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1875 | ||
fa593d66 PA |
1876 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1877 | ||
219f2f23 PA |
1878 | /* See if we just hit a tracepoint and do its main collect |
1879 | actions. */ | |
1880 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1881 | ||
863d01bd | 1882 | lwp_suspended_decr (lwp); |
7984d532 PA |
1883 | |
1884 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1885 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1886 | |
219f2f23 PA |
1887 | if (tpoint_related_event) |
1888 | { | |
1889 | if (debug_threads) | |
87ce2a04 | 1890 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1891 | return 1; |
1892 | } | |
1893 | ||
1894 | return 0; | |
1895 | } | |
1896 | ||
fa593d66 PA |
1897 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1898 | fast tracepoint. */ | |
1899 | ||
1900 | static int | |
1901 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1902 | struct fast_tpoint_collect_status *status) | |
1903 | { | |
1904 | CORE_ADDR thread_area; | |
d86d4aaf | 1905 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1906 | |
1907 | if (the_low_target.get_thread_area == NULL) | |
1908 | return 0; | |
1909 | ||
1910 | /* Get the thread area address. This is used to recognize which | |
1911 | thread is which when tracing with the in-process agent library. | |
1912 | We don't read anything from the address, and treat it as opaque; | |
1913 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 1914 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
fa593d66 PA |
1915 | return 0; |
1916 | ||
1917 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1918 | } | |
1919 | ||
1920 | /* The reason we resume in the caller, is because we want to be able | |
1921 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1922 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1923 | refuses to resume. */ | |
1924 | ||
1925 | static int | |
1926 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1927 | { | |
0bfdf32f | 1928 | struct thread_info *saved_thread; |
fa593d66 | 1929 | |
0bfdf32f GB |
1930 | saved_thread = current_thread; |
1931 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
1932 | |
1933 | if ((wstat == NULL | |
1934 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1935 | && supports_fast_tracepoints () | |
58b4daa5 | 1936 | && agent_loaded_p ()) |
fa593d66 PA |
1937 | { |
1938 | struct fast_tpoint_collect_status status; | |
1939 | int r; | |
1940 | ||
1941 | if (debug_threads) | |
87ce2a04 DE |
1942 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1943 | "jump pad.\n", | |
0bfdf32f | 1944 | lwpid_of (current_thread)); |
fa593d66 PA |
1945 | |
1946 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1947 | ||
1948 | if (wstat == NULL | |
1949 | || (WSTOPSIG (*wstat) != SIGILL | |
1950 | && WSTOPSIG (*wstat) != SIGFPE | |
1951 | && WSTOPSIG (*wstat) != SIGSEGV | |
1952 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1953 | { | |
1954 | lwp->collecting_fast_tracepoint = r; | |
1955 | ||
1956 | if (r != 0) | |
1957 | { | |
1958 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1959 | { | |
1960 | /* Haven't executed the original instruction yet. | |
1961 | Set breakpoint there, and wait till it's hit, | |
1962 | then single-step until exiting the jump pad. */ | |
1963 | lwp->exit_jump_pad_bkpt | |
1964 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1965 | } | |
1966 | ||
1967 | if (debug_threads) | |
87ce2a04 DE |
1968 | debug_printf ("Checking whether LWP %ld needs to move out of " |
1969 | "the jump pad...it does\n", | |
0bfdf32f GB |
1970 | lwpid_of (current_thread)); |
1971 | current_thread = saved_thread; | |
fa593d66 PA |
1972 | |
1973 | return 1; | |
1974 | } | |
1975 | } | |
1976 | else | |
1977 | { | |
1978 | /* If we get a synchronous signal while collecting, *and* | |
1979 | while executing the (relocated) original instruction, | |
1980 | reset the PC to point at the tpoint address, before | |
1981 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1982 | report the signal to GDB, and pray for the best. */ | |
1983 | ||
1984 | lwp->collecting_fast_tracepoint = 0; | |
1985 | ||
1986 | if (r != 0 | |
1987 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1988 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1989 | { | |
1990 | siginfo_t info; | |
1991 | struct regcache *regcache; | |
1992 | ||
1993 | /* The si_addr on a few signals references the address | |
1994 | of the faulting instruction. Adjust that as | |
1995 | well. */ | |
1996 | if ((WSTOPSIG (*wstat) == SIGILL | |
1997 | || WSTOPSIG (*wstat) == SIGFPE | |
1998 | || WSTOPSIG (*wstat) == SIGBUS | |
1999 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 2000 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2001 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
2002 | /* Final check just to make sure we don't clobber |
2003 | the siginfo of non-kernel-sent signals. */ | |
2004 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
2005 | { | |
2006 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 2007 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2008 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
2009 | } |
2010 | ||
0bfdf32f | 2011 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
2012 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
2013 | lwp->stop_pc = status.tpoint_addr; | |
2014 | ||
2015 | /* Cancel any fast tracepoint lock this thread was | |
2016 | holding. */ | |
2017 | force_unlock_trace_buffer (); | |
2018 | } | |
2019 | ||
2020 | if (lwp->exit_jump_pad_bkpt != NULL) | |
2021 | { | |
2022 | if (debug_threads) | |
87ce2a04 DE |
2023 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
2024 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2025 | |
2026 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
2027 | |
2028 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
2029 | lwp->exit_jump_pad_bkpt = NULL; | |
2030 | ||
2031 | unstop_all_lwps (1, lwp); | |
2032 | ||
2033 | gdb_assert (lwp->suspended >= 0); | |
2034 | } | |
2035 | } | |
2036 | } | |
2037 | ||
2038 | if (debug_threads) | |
87ce2a04 DE |
2039 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2040 | "jump pad...no\n", | |
0bfdf32f | 2041 | lwpid_of (current_thread)); |
0cccb683 | 2042 | |
0bfdf32f | 2043 | current_thread = saved_thread; |
fa593d66 PA |
2044 | return 0; |
2045 | } | |
2046 | ||
2047 | /* Enqueue one signal in the "signals to report later when out of the | |
2048 | jump pad" list. */ | |
2049 | ||
2050 | static void | |
2051 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2052 | { | |
2053 | struct pending_signals *p_sig; | |
d86d4aaf | 2054 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2055 | |
2056 | if (debug_threads) | |
87ce2a04 | 2057 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 2058 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2059 | |
2060 | if (debug_threads) | |
2061 | { | |
2062 | struct pending_signals *sig; | |
2063 | ||
2064 | for (sig = lwp->pending_signals_to_report; | |
2065 | sig != NULL; | |
2066 | sig = sig->prev) | |
87ce2a04 DE |
2067 | debug_printf (" Already queued %d\n", |
2068 | sig->signal); | |
fa593d66 | 2069 | |
87ce2a04 | 2070 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
2071 | } |
2072 | ||
1a981360 PA |
2073 | /* Don't enqueue non-RT signals if they are already in the deferred |
2074 | queue. (SIGSTOP being the easiest signal to see ending up here | |
2075 | twice) */ | |
2076 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
2077 | { | |
2078 | struct pending_signals *sig; | |
2079 | ||
2080 | for (sig = lwp->pending_signals_to_report; | |
2081 | sig != NULL; | |
2082 | sig = sig->prev) | |
2083 | { | |
2084 | if (sig->signal == WSTOPSIG (*wstat)) | |
2085 | { | |
2086 | if (debug_threads) | |
87ce2a04 DE |
2087 | debug_printf ("Not requeuing already queued non-RT signal %d" |
2088 | " for LWP %ld\n", | |
2089 | sig->signal, | |
d86d4aaf | 2090 | lwpid_of (thread)); |
1a981360 PA |
2091 | return; |
2092 | } | |
2093 | } | |
2094 | } | |
2095 | ||
8d749320 | 2096 | p_sig = XCNEW (struct pending_signals); |
fa593d66 PA |
2097 | p_sig->prev = lwp->pending_signals_to_report; |
2098 | p_sig->signal = WSTOPSIG (*wstat); | |
8d749320 | 2099 | |
d86d4aaf | 2100 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2101 | &p_sig->info); |
fa593d66 PA |
2102 | |
2103 | lwp->pending_signals_to_report = p_sig; | |
2104 | } | |
2105 | ||
2106 | /* Dequeue one signal from the "signals to report later when out of | |
2107 | the jump pad" list. */ | |
2108 | ||
2109 | static int | |
2110 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2111 | { | |
d86d4aaf DE |
2112 | struct thread_info *thread = get_lwp_thread (lwp); |
2113 | ||
fa593d66 PA |
2114 | if (lwp->pending_signals_to_report != NULL) |
2115 | { | |
2116 | struct pending_signals **p_sig; | |
2117 | ||
2118 | p_sig = &lwp->pending_signals_to_report; | |
2119 | while ((*p_sig)->prev != NULL) | |
2120 | p_sig = &(*p_sig)->prev; | |
2121 | ||
2122 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
2123 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 2124 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2125 | &(*p_sig)->info); |
fa593d66 PA |
2126 | free (*p_sig); |
2127 | *p_sig = NULL; | |
2128 | ||
2129 | if (debug_threads) | |
87ce2a04 | 2130 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 2131 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2132 | |
2133 | if (debug_threads) | |
2134 | { | |
2135 | struct pending_signals *sig; | |
2136 | ||
2137 | for (sig = lwp->pending_signals_to_report; | |
2138 | sig != NULL; | |
2139 | sig = sig->prev) | |
87ce2a04 DE |
2140 | debug_printf (" Still queued %d\n", |
2141 | sig->signal); | |
fa593d66 | 2142 | |
87ce2a04 | 2143 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
2144 | } |
2145 | ||
2146 | return 1; | |
2147 | } | |
2148 | ||
2149 | return 0; | |
2150 | } | |
2151 | ||
582511be PA |
2152 | /* Fetch the possibly triggered data watchpoint info and store it in |
2153 | CHILD. | |
d50171e4 | 2154 | |
582511be PA |
2155 | On some archs, like x86, that use debug registers to set |
2156 | watchpoints, it's possible that the way to know which watched | |
2157 | address trapped, is to check the register that is used to select | |
2158 | which address to watch. Problem is, between setting the watchpoint | |
2159 | and reading back which data address trapped, the user may change | |
2160 | the set of watchpoints, and, as a consequence, GDB changes the | |
2161 | debug registers in the inferior. To avoid reading back a stale | |
2162 | stopped-data-address when that happens, we cache in LP the fact | |
2163 | that a watchpoint trapped, and the corresponding data address, as | |
2164 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
2165 | registers meanwhile, we have the cached data we can rely on. */ | |
d50171e4 | 2166 | |
582511be PA |
2167 | static int |
2168 | check_stopped_by_watchpoint (struct lwp_info *child) | |
2169 | { | |
2170 | if (the_low_target.stopped_by_watchpoint != NULL) | |
d50171e4 | 2171 | { |
582511be | 2172 | struct thread_info *saved_thread; |
d50171e4 | 2173 | |
582511be PA |
2174 | saved_thread = current_thread; |
2175 | current_thread = get_lwp_thread (child); | |
2176 | ||
2177 | if (the_low_target.stopped_by_watchpoint ()) | |
d50171e4 | 2178 | { |
15c66dd6 | 2179 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; |
582511be PA |
2180 | |
2181 | if (the_low_target.stopped_data_address != NULL) | |
2182 | child->stopped_data_address | |
2183 | = the_low_target.stopped_data_address (); | |
2184 | else | |
2185 | child->stopped_data_address = 0; | |
d50171e4 PA |
2186 | } |
2187 | ||
0bfdf32f | 2188 | current_thread = saved_thread; |
d50171e4 PA |
2189 | } |
2190 | ||
15c66dd6 | 2191 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
c4d9ceb6 YQ |
2192 | } |
2193 | ||
de0d863e DB |
2194 | /* Return the ptrace options that we want to try to enable. */ |
2195 | ||
2196 | static int | |
2197 | linux_low_ptrace_options (int attached) | |
2198 | { | |
2199 | int options = 0; | |
2200 | ||
2201 | if (!attached) | |
2202 | options |= PTRACE_O_EXITKILL; | |
2203 | ||
2204 | if (report_fork_events) | |
2205 | options |= PTRACE_O_TRACEFORK; | |
2206 | ||
c269dbdb DB |
2207 | if (report_vfork_events) |
2208 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); | |
2209 | ||
94585166 DB |
2210 | if (report_exec_events) |
2211 | options |= PTRACE_O_TRACEEXEC; | |
2212 | ||
de0d863e DB |
2213 | return options; |
2214 | } | |
2215 | ||
fa96cb38 PA |
2216 | /* Do low-level handling of the event, and check if we should go on |
2217 | and pass it to caller code. Return the affected lwp if we are, or | |
2218 | NULL otherwise. */ | |
2219 | ||
2220 | static struct lwp_info * | |
582511be | 2221 | linux_low_filter_event (int lwpid, int wstat) |
fa96cb38 PA |
2222 | { |
2223 | struct lwp_info *child; | |
2224 | struct thread_info *thread; | |
582511be | 2225 | int have_stop_pc = 0; |
fa96cb38 PA |
2226 | |
2227 | child = find_lwp_pid (pid_to_ptid (lwpid)); | |
2228 | ||
94585166 DB |
2229 | /* Check for stop events reported by a process we didn't already |
2230 | know about - anything not already in our LWP list. | |
2231 | ||
2232 | If we're expecting to receive stopped processes after | |
2233 | fork, vfork, and clone events, then we'll just add the | |
2234 | new one to our list and go back to waiting for the event | |
2235 | to be reported - the stopped process might be returned | |
2236 | from waitpid before or after the event is. | |
2237 | ||
2238 | But note the case of a non-leader thread exec'ing after the | |
2239 | leader having exited, and gone from our lists (because | |
2240 | check_zombie_leaders deleted it). The non-leader thread | |
2241 | changes its tid to the tgid. */ | |
2242 | ||
2243 | if (WIFSTOPPED (wstat) && child == NULL && WSTOPSIG (wstat) == SIGTRAP | |
2244 | && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC) | |
2245 | { | |
2246 | ptid_t child_ptid; | |
2247 | ||
2248 | /* A multi-thread exec after we had seen the leader exiting. */ | |
2249 | if (debug_threads) | |
2250 | { | |
2251 | debug_printf ("LLW: Re-adding thread group leader LWP %d" | |
2252 | "after exec.\n", lwpid); | |
2253 | } | |
2254 | ||
2255 | child_ptid = ptid_build (lwpid, lwpid, 0); | |
2256 | child = add_lwp (child_ptid); | |
2257 | child->stopped = 1; | |
2258 | current_thread = child->thread; | |
2259 | } | |
2260 | ||
fa96cb38 PA |
2261 | /* If we didn't find a process, one of two things presumably happened: |
2262 | - A process we started and then detached from has exited. Ignore it. | |
2263 | - A process we are controlling has forked and the new child's stop | |
2264 | was reported to us by the kernel. Save its PID. */ | |
2265 | if (child == NULL && WIFSTOPPED (wstat)) | |
2266 | { | |
2267 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2268 | return NULL; | |
2269 | } | |
2270 | else if (child == NULL) | |
2271 | return NULL; | |
2272 | ||
2273 | thread = get_lwp_thread (child); | |
2274 | ||
2275 | child->stopped = 1; | |
2276 | ||
2277 | child->last_status = wstat; | |
2278 | ||
582511be PA |
2279 | /* Check if the thread has exited. */ |
2280 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2281 | { | |
2282 | if (debug_threads) | |
2283 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
65706a29 PA |
2284 | /* If there is at least one more LWP, then the exit signal was |
2285 | not the end of the debugged application and should be | |
2286 | ignored, unless GDB wants to hear about thread exits. */ | |
2287 | if (report_thread_events | |
2288 | || last_thread_of_process_p (pid_of (thread))) | |
582511be | 2289 | { |
65706a29 PA |
2290 | /* Since events are serialized to GDB core, and we can't |
2291 | report this one right now. Leave the status pending for | |
2292 | the next time we're able to report it. */ | |
2293 | mark_lwp_dead (child, wstat); | |
2294 | return child; | |
582511be PA |
2295 | } |
2296 | else | |
2297 | { | |
65706a29 PA |
2298 | delete_lwp (child); |
2299 | return NULL; | |
582511be PA |
2300 | } |
2301 | } | |
2302 | ||
2303 | gdb_assert (WIFSTOPPED (wstat)); | |
2304 | ||
fa96cb38 PA |
2305 | if (WIFSTOPPED (wstat)) |
2306 | { | |
2307 | struct process_info *proc; | |
2308 | ||
c06cbd92 | 2309 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2310 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2311 | if (proc->tdesc == NULL) |
fa96cb38 | 2312 | { |
c06cbd92 YQ |
2313 | if (proc->attached) |
2314 | { | |
c06cbd92 YQ |
2315 | /* This needs to happen after we have attached to the |
2316 | inferior and it is stopped for the first time, but | |
2317 | before we access any inferior registers. */ | |
94585166 | 2318 | linux_arch_setup_thread (thread); |
c06cbd92 YQ |
2319 | } |
2320 | else | |
2321 | { | |
2322 | /* The process is started, but GDBserver will do | |
2323 | architecture-specific setup after the program stops at | |
2324 | the first instruction. */ | |
2325 | child->status_pending_p = 1; | |
2326 | child->status_pending = wstat; | |
2327 | return child; | |
2328 | } | |
fa96cb38 PA |
2329 | } |
2330 | } | |
2331 | ||
fa96cb38 PA |
2332 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2333 | { | |
beed38b8 | 2334 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2335 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2336 | |
de0d863e | 2337 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2338 | child->must_set_ptrace_flags = 0; |
2339 | } | |
2340 | ||
582511be PA |
2341 | /* Be careful to not overwrite stop_pc until |
2342 | check_stopped_by_breakpoint is called. */ | |
fa96cb38 | 2343 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2344 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2345 | { |
582511be | 2346 | child->stop_pc = get_pc (child); |
94585166 | 2347 | if (handle_extended_wait (&child, wstat)) |
de0d863e DB |
2348 | { |
2349 | /* The event has been handled, so just return without | |
2350 | reporting it. */ | |
2351 | return NULL; | |
2352 | } | |
fa96cb38 PA |
2353 | } |
2354 | ||
3e572f71 PA |
2355 | /* Check first whether this was a SW/HW breakpoint before checking |
2356 | watchpoints, because at least s390 can't tell the data address of | |
2357 | hardware watchpoint hits, and returns stopped-by-watchpoint as | |
2358 | long as there's a watchpoint set. */ | |
2359 | if (WIFSTOPPED (wstat) && linux_wstatus_maybe_breakpoint (wstat)) | |
582511be PA |
2360 | { |
2361 | if (check_stopped_by_breakpoint (child)) | |
2362 | have_stop_pc = 1; | |
2363 | } | |
2364 | ||
3e572f71 PA |
2365 | /* Note that TRAP_HWBKPT can indicate either a hardware breakpoint |
2366 | or hardware watchpoint. Check which is which if we got | |
863d01bd PA |
2367 | TARGET_STOPPED_BY_HW_BREAKPOINT. Likewise, we may have single |
2368 | stepped an instruction that triggered a watchpoint. In that | |
2369 | case, on some architectures (such as x86), instead of | |
2370 | TRAP_HWBKPT, si_code indicates TRAP_TRACE, and we need to check | |
2371 | the debug registers separately. */ | |
3e572f71 | 2372 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
863d01bd | 2373 | && child->stop_reason != TARGET_STOPPED_BY_SW_BREAKPOINT) |
3e572f71 PA |
2374 | check_stopped_by_watchpoint (child); |
2375 | ||
582511be PA |
2376 | if (!have_stop_pc) |
2377 | child->stop_pc = get_pc (child); | |
2378 | ||
fa96cb38 PA |
2379 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2380 | && child->stop_expected) | |
2381 | { | |
2382 | if (debug_threads) | |
2383 | debug_printf ("Expected stop.\n"); | |
2384 | child->stop_expected = 0; | |
2385 | ||
2386 | if (thread->last_resume_kind == resume_stop) | |
2387 | { | |
2388 | /* We want to report the stop to the core. Treat the | |
2389 | SIGSTOP as a normal event. */ | |
2bf6fb9d PA |
2390 | if (debug_threads) |
2391 | debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n", | |
2392 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2393 | } |
2394 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2395 | { | |
2396 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2397 | pending. */ |
2bf6fb9d PA |
2398 | if (debug_threads) |
2399 | debug_printf ("LLW: SIGSTOP caught for %s " | |
2400 | "while stopping threads.\n", | |
2401 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2402 | return NULL; |
2403 | } | |
2404 | else | |
2405 | { | |
2bf6fb9d PA |
2406 | /* This is a delayed SIGSTOP. Filter out the event. */ |
2407 | if (debug_threads) | |
2408 | debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", | |
2409 | child->stepping ? "step" : "continue", | |
2410 | target_pid_to_str (ptid_of (thread))); | |
2411 | ||
fa96cb38 PA |
2412 | linux_resume_one_lwp (child, child->stepping, 0, NULL); |
2413 | return NULL; | |
2414 | } | |
2415 | } | |
2416 | ||
582511be PA |
2417 | child->status_pending_p = 1; |
2418 | child->status_pending = wstat; | |
fa96cb38 PA |
2419 | return child; |
2420 | } | |
2421 | ||
20ba1ce6 PA |
2422 | /* Resume LWPs that are currently stopped without any pending status |
2423 | to report, but are resumed from the core's perspective. */ | |
2424 | ||
2425 | static void | |
2426 | resume_stopped_resumed_lwps (struct inferior_list_entry *entry) | |
2427 | { | |
2428 | struct thread_info *thread = (struct thread_info *) entry; | |
2429 | struct lwp_info *lp = get_thread_lwp (thread); | |
2430 | ||
2431 | if (lp->stopped | |
863d01bd | 2432 | && !lp->suspended |
20ba1ce6 | 2433 | && !lp->status_pending_p |
20ba1ce6 PA |
2434 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) |
2435 | { | |
2436 | int step = thread->last_resume_kind == resume_step; | |
2437 | ||
2438 | if (debug_threads) | |
2439 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2440 | target_pid_to_str (ptid_of (thread)), | |
2441 | paddress (lp->stop_pc), | |
2442 | step); | |
2443 | ||
2444 | linux_resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); | |
2445 | } | |
2446 | } | |
2447 | ||
fa96cb38 PA |
2448 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
2449 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
2450 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2451 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2452 | the stop status through the status pointer WSTAT. OPTIONS is | |
2453 | passed to the waitpid call. Return 0 if no event was found and | |
2454 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2455 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 2456 | |
0d62e5e8 | 2457 | static int |
fa96cb38 PA |
2458 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
2459 | int *wstatp, int options) | |
0d62e5e8 | 2460 | { |
d86d4aaf | 2461 | struct thread_info *event_thread; |
d50171e4 | 2462 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2463 | sigset_t block_mask, prev_mask; |
d50171e4 | 2464 | |
fa96cb38 | 2465 | retry: |
d86d4aaf DE |
2466 | /* N.B. event_thread points to the thread_info struct that contains |
2467 | event_child. Keep them in sync. */ | |
2468 | event_thread = NULL; | |
d50171e4 PA |
2469 | event_child = NULL; |
2470 | requested_child = NULL; | |
0d62e5e8 | 2471 | |
95954743 | 2472 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2473 | |
fa96cb38 | 2474 | if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid)) |
0d62e5e8 | 2475 | { |
d86d4aaf | 2476 | event_thread = (struct thread_info *) |
fa96cb38 | 2477 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); |
d86d4aaf DE |
2478 | if (event_thread != NULL) |
2479 | event_child = get_thread_lwp (event_thread); | |
2480 | if (debug_threads && event_thread) | |
2481 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2482 | } |
fa96cb38 | 2483 | else if (!ptid_equal (filter_ptid, null_ptid)) |
0d62e5e8 | 2484 | { |
fa96cb38 | 2485 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2486 | |
bde24c0a | 2487 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
2488 | && requested_child->status_pending_p |
2489 | && requested_child->collecting_fast_tracepoint) | |
2490 | { | |
2491 | enqueue_one_deferred_signal (requested_child, | |
2492 | &requested_child->status_pending); | |
2493 | requested_child->status_pending_p = 0; | |
2494 | requested_child->status_pending = 0; | |
2495 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2496 | } | |
2497 | ||
2498 | if (requested_child->suspended | |
2499 | && requested_child->status_pending_p) | |
38e08fca GB |
2500 | { |
2501 | internal_error (__FILE__, __LINE__, | |
2502 | "requesting an event out of a" | |
2503 | " suspended child?"); | |
2504 | } | |
fa593d66 | 2505 | |
d50171e4 | 2506 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2507 | { |
2508 | event_child = requested_child; | |
2509 | event_thread = get_lwp_thread (event_child); | |
2510 | } | |
0d62e5e8 | 2511 | } |
611cb4a5 | 2512 | |
0d62e5e8 DJ |
2513 | if (event_child != NULL) |
2514 | { | |
bd99dc85 | 2515 | if (debug_threads) |
87ce2a04 | 2516 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2517 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2518 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2519 | event_child->status_pending_p = 0; |
2520 | event_child->status_pending = 0; | |
0bfdf32f | 2521 | current_thread = event_thread; |
d86d4aaf | 2522 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2523 | } |
2524 | ||
fa96cb38 PA |
2525 | /* But if we don't find a pending event, we'll have to wait. |
2526 | ||
2527 | We only enter this loop if no process has a pending wait status. | |
2528 | Thus any action taken in response to a wait status inside this | |
2529 | loop is responding as soon as we detect the status, not after any | |
2530 | pending events. */ | |
d8301ad1 | 2531 | |
fa96cb38 PA |
2532 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2533 | all signals while here. */ | |
2534 | sigfillset (&block_mask); | |
2535 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2536 | ||
582511be PA |
2537 | /* Always pull all events out of the kernel. We'll randomly select |
2538 | an event LWP out of all that have events, to prevent | |
2539 | starvation. */ | |
fa96cb38 | 2540 | while (event_child == NULL) |
0d62e5e8 | 2541 | { |
fa96cb38 | 2542 | pid_t ret = 0; |
0d62e5e8 | 2543 | |
fa96cb38 PA |
2544 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2545 | quirks: | |
0d62e5e8 | 2546 | |
fa96cb38 PA |
2547 | - If the thread group leader exits while other threads in the |
2548 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2549 | waitpid won't return an exit status until the other threads | |
2550 | in the group are reaped. | |
611cb4a5 | 2551 | |
fa96cb38 PA |
2552 | - When a non-leader thread execs, that thread just vanishes |
2553 | without reporting an exit (so we'd hang if we waited for it | |
2554 | explicitly in that case). The exec event is reported to | |
94585166 | 2555 | the TGID pid. */ |
fa96cb38 PA |
2556 | errno = 0; |
2557 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2558 | |
fa96cb38 PA |
2559 | if (debug_threads) |
2560 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2561 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2562 | |
fa96cb38 | 2563 | if (ret > 0) |
0d62e5e8 | 2564 | { |
89be2091 | 2565 | if (debug_threads) |
bd99dc85 | 2566 | { |
fa96cb38 PA |
2567 | debug_printf ("LLW: waitpid %ld received %s\n", |
2568 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2569 | } |
89be2091 | 2570 | |
582511be PA |
2571 | /* Filter all events. IOW, leave all events pending. We'll |
2572 | randomly select an event LWP out of all that have events | |
2573 | below. */ | |
2574 | linux_low_filter_event (ret, *wstatp); | |
fa96cb38 PA |
2575 | /* Retry until nothing comes out of waitpid. A single |
2576 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2577 | continue; |
2578 | } | |
2579 | ||
20ba1ce6 PA |
2580 | /* Now that we've pulled all events out of the kernel, resume |
2581 | LWPs that don't have an interesting event to report. */ | |
2582 | if (stopping_threads == NOT_STOPPING_THREADS) | |
2583 | for_each_inferior (&all_threads, resume_stopped_resumed_lwps); | |
2584 | ||
2585 | /* ... and find an LWP with a status to report to the core, if | |
2586 | any. */ | |
582511be PA |
2587 | event_thread = (struct thread_info *) |
2588 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); | |
2589 | if (event_thread != NULL) | |
2590 | { | |
2591 | event_child = get_thread_lwp (event_thread); | |
2592 | *wstatp = event_child->status_pending; | |
2593 | event_child->status_pending_p = 0; | |
2594 | event_child->status_pending = 0; | |
2595 | break; | |
2596 | } | |
2597 | ||
fa96cb38 PA |
2598 | /* Check for zombie thread group leaders. Those can't be reaped |
2599 | until all other threads in the thread group are. */ | |
2600 | check_zombie_leaders (); | |
2601 | ||
2602 | /* If there are no resumed children left in the set of LWPs we | |
2603 | want to wait for, bail. We can't just block in | |
2604 | waitpid/sigsuspend, because lwps might have been left stopped | |
2605 | in trace-stop state, and we'd be stuck forever waiting for | |
2606 | their status to change (which would only happen if we resumed | |
2607 | them). Even if WNOHANG is set, this return code is preferred | |
2608 | over 0 (below), as it is more detailed. */ | |
2609 | if ((find_inferior (&all_threads, | |
2610 | not_stopped_callback, | |
2611 | &wait_ptid) == NULL)) | |
a6dbe5df | 2612 | { |
fa96cb38 PA |
2613 | if (debug_threads) |
2614 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2615 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2616 | return -1; | |
a6dbe5df PA |
2617 | } |
2618 | ||
fa96cb38 PA |
2619 | /* No interesting event to report to the caller. */ |
2620 | if ((options & WNOHANG)) | |
24a09b5f | 2621 | { |
fa96cb38 PA |
2622 | if (debug_threads) |
2623 | debug_printf ("WNOHANG set, no event found\n"); | |
2624 | ||
2625 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2626 | return 0; | |
24a09b5f DJ |
2627 | } |
2628 | ||
fa96cb38 PA |
2629 | /* Block until we get an event reported with SIGCHLD. */ |
2630 | if (debug_threads) | |
2631 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2632 | |
fa96cb38 PA |
2633 | sigsuspend (&prev_mask); |
2634 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2635 | goto retry; | |
2636 | } | |
d50171e4 | 2637 | |
fa96cb38 | 2638 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2639 | |
0bfdf32f | 2640 | current_thread = event_thread; |
d50171e4 | 2641 | |
fa96cb38 PA |
2642 | return lwpid_of (event_thread); |
2643 | } | |
2644 | ||
2645 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2646 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2647 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2648 | the stop status through the status pointer WSTAT. OPTIONS is | |
2649 | passed to the waitpid call. Return 0 if no event was found and | |
2650 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2651 | was found. Return the PID of the stopped child otherwise. */ | |
2652 | ||
2653 | static int | |
2654 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2655 | { | |
2656 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2657 | } |
2658 | ||
6bf5e0ba PA |
2659 | /* Count the LWP's that have had events. */ |
2660 | ||
2661 | static int | |
2662 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2663 | { | |
d86d4aaf | 2664 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2665 | struct lwp_info *lp = get_thread_lwp (thread); |
9a3c8263 | 2666 | int *count = (int *) data; |
6bf5e0ba PA |
2667 | |
2668 | gdb_assert (count != NULL); | |
2669 | ||
582511be | 2670 | /* Count only resumed LWPs that have an event pending. */ |
8336d594 | 2671 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2672 | && lp->status_pending_p) |
6bf5e0ba PA |
2673 | (*count)++; |
2674 | ||
2675 | return 0; | |
2676 | } | |
2677 | ||
2678 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2679 | ||
2680 | static int | |
2681 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2682 | { | |
d86d4aaf DE |
2683 | struct thread_info *thread = (struct thread_info *) entry; |
2684 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba | 2685 | |
8336d594 PA |
2686 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2687 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2688 | && lp->status_pending_p) |
2689 | return 1; | |
2690 | else | |
2691 | return 0; | |
2692 | } | |
2693 | ||
b90fc188 | 2694 | /* Select the Nth LWP that has had an event. */ |
6bf5e0ba PA |
2695 | |
2696 | static int | |
2697 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2698 | { | |
d86d4aaf | 2699 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2700 | struct lwp_info *lp = get_thread_lwp (thread); |
9a3c8263 | 2701 | int *selector = (int *) data; |
6bf5e0ba PA |
2702 | |
2703 | gdb_assert (selector != NULL); | |
2704 | ||
582511be | 2705 | /* Select only resumed LWPs that have an event pending. */ |
91baf43f | 2706 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2707 | && lp->status_pending_p) |
6bf5e0ba PA |
2708 | if ((*selector)-- == 0) |
2709 | return 1; | |
2710 | ||
2711 | return 0; | |
2712 | } | |
2713 | ||
6bf5e0ba PA |
2714 | /* Select one LWP out of those that have events pending. */ |
2715 | ||
2716 | static void | |
2717 | select_event_lwp (struct lwp_info **orig_lp) | |
2718 | { | |
2719 | int num_events = 0; | |
2720 | int random_selector; | |
582511be PA |
2721 | struct thread_info *event_thread = NULL; |
2722 | ||
2723 | /* In all-stop, give preference to the LWP that is being | |
2724 | single-stepped. There will be at most one, and it's the LWP that | |
2725 | the core is most interested in. If we didn't do this, then we'd | |
2726 | have to handle pending step SIGTRAPs somehow in case the core | |
2727 | later continues the previously-stepped thread, otherwise we'd | |
2728 | report the pending SIGTRAP, and the core, not having stepped the | |
2729 | thread, wouldn't understand what the trap was for, and therefore | |
2730 | would report it to the user as a random signal. */ | |
2731 | if (!non_stop) | |
6bf5e0ba | 2732 | { |
582511be PA |
2733 | event_thread |
2734 | = (struct thread_info *) find_inferior (&all_threads, | |
2735 | select_singlestep_lwp_callback, | |
2736 | NULL); | |
2737 | if (event_thread != NULL) | |
2738 | { | |
2739 | if (debug_threads) | |
2740 | debug_printf ("SEL: Select single-step %s\n", | |
2741 | target_pid_to_str (ptid_of (event_thread))); | |
2742 | } | |
6bf5e0ba | 2743 | } |
582511be | 2744 | if (event_thread == NULL) |
6bf5e0ba PA |
2745 | { |
2746 | /* No single-stepping LWP. Select one at random, out of those | |
b90fc188 | 2747 | which have had events. */ |
6bf5e0ba | 2748 | |
b90fc188 | 2749 | /* First see how many events we have. */ |
d86d4aaf | 2750 | find_inferior (&all_threads, count_events_callback, &num_events); |
8bf3b159 | 2751 | gdb_assert (num_events > 0); |
6bf5e0ba | 2752 | |
b90fc188 PA |
2753 | /* Now randomly pick a LWP out of those that have had |
2754 | events. */ | |
6bf5e0ba PA |
2755 | random_selector = (int) |
2756 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2757 | ||
2758 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2759 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2760 | num_events, random_selector); | |
6bf5e0ba | 2761 | |
d86d4aaf DE |
2762 | event_thread |
2763 | = (struct thread_info *) find_inferior (&all_threads, | |
2764 | select_event_lwp_callback, | |
2765 | &random_selector); | |
6bf5e0ba PA |
2766 | } |
2767 | ||
d86d4aaf | 2768 | if (event_thread != NULL) |
6bf5e0ba | 2769 | { |
d86d4aaf DE |
2770 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2771 | ||
6bf5e0ba PA |
2772 | /* Switch the event LWP. */ |
2773 | *orig_lp = event_lp; | |
2774 | } | |
2775 | } | |
2776 | ||
7984d532 PA |
2777 | /* Decrement the suspend count of an LWP. */ |
2778 | ||
2779 | static int | |
2780 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2781 | { | |
d86d4aaf DE |
2782 | struct thread_info *thread = (struct thread_info *) entry; |
2783 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
2784 | |
2785 | /* Ignore EXCEPT. */ | |
2786 | if (lwp == except) | |
2787 | return 0; | |
2788 | ||
863d01bd | 2789 | lwp_suspended_decr (lwp); |
7984d532 PA |
2790 | return 0; |
2791 | } | |
2792 | ||
2793 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2794 | NULL. */ | |
2795 | ||
2796 | static void | |
2797 | unsuspend_all_lwps (struct lwp_info *except) | |
2798 | { | |
d86d4aaf | 2799 | find_inferior (&all_threads, unsuspend_one_lwp, except); |
7984d532 PA |
2800 | } |
2801 | ||
fa593d66 PA |
2802 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2803 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2804 | void *data); | |
2805 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2806 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2807 | struct target_waitstatus *ourstatus, | |
2808 | int target_options); | |
2809 | ||
2810 | /* Stabilize threads (move out of jump pads). | |
2811 | ||
2812 | If a thread is midway collecting a fast tracepoint, we need to | |
2813 | finish the collection and move it out of the jump pad before | |
2814 | reporting the signal. | |
2815 | ||
2816 | This avoids recursion while collecting (when a signal arrives | |
2817 | midway, and the signal handler itself collects), which would trash | |
2818 | the trace buffer. In case the user set a breakpoint in a signal | |
2819 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2820 | Most importantly, there are certain things we can't do safely if | |
2821 | threads are stopped in a jump pad (or in its callee's). For | |
2822 | example: | |
2823 | ||
2824 | - starting a new trace run. A thread still collecting the | |
2825 | previous run, could trash the trace buffer when resumed. The trace | |
2826 | buffer control structures would have been reset but the thread had | |
2827 | no way to tell. The thread could even midway memcpy'ing to the | |
2828 | buffer, which would mean that when resumed, it would clobber the | |
2829 | trace buffer that had been set for a new run. | |
2830 | ||
2831 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2832 | safely. Say you do tstart while a thread is stopped midway while | |
2833 | collecting. When the thread is later resumed, it finishes the | |
2834 | collection, and returns to the jump pad, to execute the original | |
2835 | instruction that was under the tracepoint jump at the time the | |
2836 | older run had been started. If the jump pad had been rewritten | |
2837 | since for something else in the new run, the thread would now | |
2838 | execute the wrong / random instructions. */ | |
2839 | ||
2840 | static void | |
2841 | linux_stabilize_threads (void) | |
2842 | { | |
0bfdf32f | 2843 | struct thread_info *saved_thread; |
d86d4aaf | 2844 | struct thread_info *thread_stuck; |
fa593d66 | 2845 | |
d86d4aaf DE |
2846 | thread_stuck |
2847 | = (struct thread_info *) find_inferior (&all_threads, | |
2848 | stuck_in_jump_pad_callback, | |
2849 | NULL); | |
2850 | if (thread_stuck != NULL) | |
fa593d66 | 2851 | { |
b4d51a55 | 2852 | if (debug_threads) |
87ce2a04 | 2853 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2854 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2855 | return; |
2856 | } | |
2857 | ||
0bfdf32f | 2858 | saved_thread = current_thread; |
fa593d66 PA |
2859 | |
2860 | stabilizing_threads = 1; | |
2861 | ||
2862 | /* Kick 'em all. */ | |
d86d4aaf | 2863 | for_each_inferior (&all_threads, move_out_of_jump_pad_callback); |
fa593d66 PA |
2864 | |
2865 | /* Loop until all are stopped out of the jump pads. */ | |
d86d4aaf | 2866 | while (find_inferior (&all_threads, lwp_running, NULL) != NULL) |
fa593d66 PA |
2867 | { |
2868 | struct target_waitstatus ourstatus; | |
2869 | struct lwp_info *lwp; | |
fa593d66 PA |
2870 | int wstat; |
2871 | ||
2872 | /* Note that we go through the full wait even loop. While | |
2873 | moving threads out of jump pad, we need to be able to step | |
2874 | over internal breakpoints and such. */ | |
32fcada3 | 2875 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2876 | |
2877 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2878 | { | |
0bfdf32f | 2879 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2880 | |
2881 | /* Lock it. */ | |
863d01bd | 2882 | lwp_suspended_inc (lwp); |
fa593d66 | 2883 | |
a493e3e2 | 2884 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2885 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2886 | { |
2ea28649 | 2887 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2888 | enqueue_one_deferred_signal (lwp, &wstat); |
2889 | } | |
2890 | } | |
2891 | } | |
2892 | ||
d86d4aaf | 2893 | find_inferior (&all_threads, unsuspend_one_lwp, NULL); |
fa593d66 PA |
2894 | |
2895 | stabilizing_threads = 0; | |
2896 | ||
0bfdf32f | 2897 | current_thread = saved_thread; |
fa593d66 | 2898 | |
b4d51a55 | 2899 | if (debug_threads) |
fa593d66 | 2900 | { |
d86d4aaf DE |
2901 | thread_stuck |
2902 | = (struct thread_info *) find_inferior (&all_threads, | |
2903 | stuck_in_jump_pad_callback, | |
2904 | NULL); | |
2905 | if (thread_stuck != NULL) | |
87ce2a04 | 2906 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2907 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2908 | } |
2909 | } | |
2910 | ||
582511be PA |
2911 | /* Convenience function that is called when the kernel reports an |
2912 | event that is not passed out to GDB. */ | |
2913 | ||
2914 | static ptid_t | |
2915 | ignore_event (struct target_waitstatus *ourstatus) | |
2916 | { | |
2917 | /* If we got an event, there may still be others, as a single | |
2918 | SIGCHLD can indicate more than one child stopped. This forces | |
2919 | another target_wait call. */ | |
2920 | async_file_mark (); | |
2921 | ||
2922 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2923 | return null_ptid; | |
2924 | } | |
2925 | ||
65706a29 PA |
2926 | /* Convenience function that is called when the kernel reports an exit |
2927 | event. This decides whether to report the event to GDB as a | |
2928 | process exit event, a thread exit event, or to suppress the | |
2929 | event. */ | |
2930 | ||
2931 | static ptid_t | |
2932 | filter_exit_event (struct lwp_info *event_child, | |
2933 | struct target_waitstatus *ourstatus) | |
2934 | { | |
2935 | struct thread_info *thread = get_lwp_thread (event_child); | |
2936 | ptid_t ptid = ptid_of (thread); | |
2937 | ||
2938 | if (!last_thread_of_process_p (pid_of (thread))) | |
2939 | { | |
2940 | if (report_thread_events) | |
2941 | ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED; | |
2942 | else | |
2943 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2944 | ||
2945 | delete_lwp (event_child); | |
2946 | } | |
2947 | return ptid; | |
2948 | } | |
2949 | ||
0d62e5e8 | 2950 | /* Wait for process, returns status. */ |
da6d8c04 | 2951 | |
95954743 PA |
2952 | static ptid_t |
2953 | linux_wait_1 (ptid_t ptid, | |
2954 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2955 | { |
e5f1222d | 2956 | int w; |
fc7238bb | 2957 | struct lwp_info *event_child; |
bd99dc85 | 2958 | int options; |
bd99dc85 | 2959 | int pid; |
6bf5e0ba PA |
2960 | int step_over_finished; |
2961 | int bp_explains_trap; | |
2962 | int maybe_internal_trap; | |
2963 | int report_to_gdb; | |
219f2f23 | 2964 | int trace_event; |
c2d6af84 | 2965 | int in_step_range; |
f2faf941 | 2966 | int any_resumed; |
bd99dc85 | 2967 | |
87ce2a04 DE |
2968 | if (debug_threads) |
2969 | { | |
2970 | debug_enter (); | |
2971 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
2972 | } | |
2973 | ||
bd99dc85 PA |
2974 | /* Translate generic target options into linux options. */ |
2975 | options = __WALL; | |
2976 | if (target_options & TARGET_WNOHANG) | |
2977 | options |= WNOHANG; | |
0d62e5e8 | 2978 | |
fa593d66 PA |
2979 | bp_explains_trap = 0; |
2980 | trace_event = 0; | |
c2d6af84 | 2981 | in_step_range = 0; |
bd99dc85 PA |
2982 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2983 | ||
f2faf941 PA |
2984 | /* Find a resumed LWP, if any. */ |
2985 | if (find_inferior (&all_threads, | |
2986 | status_pending_p_callback, | |
2987 | &minus_one_ptid) != NULL) | |
2988 | any_resumed = 1; | |
2989 | else if ((find_inferior (&all_threads, | |
2990 | not_stopped_callback, | |
2991 | &minus_one_ptid) != NULL)) | |
2992 | any_resumed = 1; | |
2993 | else | |
2994 | any_resumed = 0; | |
2995 | ||
6bf5e0ba PA |
2996 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2997 | pid = linux_wait_for_event (ptid, &w, options); | |
2998 | else | |
2999 | { | |
3000 | if (debug_threads) | |
87ce2a04 DE |
3001 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
3002 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
3003 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
3004 | } | |
3005 | ||
f2faf941 | 3006 | if (pid == 0 || (pid == -1 && !any_resumed)) |
87ce2a04 | 3007 | { |
fa96cb38 PA |
3008 | gdb_assert (target_options & TARGET_WNOHANG); |
3009 | ||
87ce2a04 DE |
3010 | if (debug_threads) |
3011 | { | |
fa96cb38 PA |
3012 | debug_printf ("linux_wait_1 ret = null_ptid, " |
3013 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
3014 | debug_exit (); |
3015 | } | |
fa96cb38 PA |
3016 | |
3017 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
3018 | return null_ptid; |
3019 | } | |
fa96cb38 PA |
3020 | else if (pid == -1) |
3021 | { | |
3022 | if (debug_threads) | |
3023 | { | |
3024 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
3025 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
3026 | debug_exit (); | |
3027 | } | |
bd99dc85 | 3028 | |
fa96cb38 PA |
3029 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
3030 | return null_ptid; | |
3031 | } | |
0d62e5e8 | 3032 | |
0bfdf32f | 3033 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 3034 | |
fa96cb38 PA |
3035 | /* linux_wait_for_event only returns an exit status for the last |
3036 | child of a process. Report it. */ | |
3037 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 3038 | { |
fa96cb38 | 3039 | if (WIFEXITED (w)) |
0d62e5e8 | 3040 | { |
fa96cb38 PA |
3041 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
3042 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 3043 | |
fa96cb38 | 3044 | if (debug_threads) |
bd99dc85 | 3045 | { |
fa96cb38 PA |
3046 | debug_printf ("linux_wait_1 ret = %s, exited with " |
3047 | "retcode %d\n", | |
0bfdf32f | 3048 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3049 | WEXITSTATUS (w)); |
3050 | debug_exit (); | |
bd99dc85 | 3051 | } |
fa96cb38 PA |
3052 | } |
3053 | else | |
3054 | { | |
3055 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
3056 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 3057 | |
fa96cb38 PA |
3058 | if (debug_threads) |
3059 | { | |
3060 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
3061 | "signal %d\n", | |
0bfdf32f | 3062 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3063 | WTERMSIG (w)); |
3064 | debug_exit (); | |
3065 | } | |
0d62e5e8 | 3066 | } |
fa96cb38 | 3067 | |
65706a29 PA |
3068 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3069 | return filter_exit_event (event_child, ourstatus); | |
3070 | ||
0bfdf32f | 3071 | return ptid_of (current_thread); |
da6d8c04 DJ |
3072 | } |
3073 | ||
2d97cd35 AT |
3074 | /* If step-over executes a breakpoint instruction, in the case of a |
3075 | hardware single step it means a gdb/gdbserver breakpoint had been | |
3076 | planted on top of a permanent breakpoint, in the case of a software | |
3077 | single step it may just mean that gdbserver hit the reinsert breakpoint. | |
3078 | The PC has been adjusted by check_stopped_by_breakpoint to point at | |
3079 | the breakpoint address. | |
3080 | So in the case of the hardware single step advance the PC manually | |
3081 | past the breakpoint and in the case of software single step advance only | |
3082 | if it's not the reinsert_breakpoint we are hitting. | |
3083 | This avoids that a program would keep trapping a permanent breakpoint | |
3084 | forever. */ | |
8090aef2 | 3085 | if (!ptid_equal (step_over_bkpt, null_ptid) |
2d97cd35 AT |
3086 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
3087 | && (event_child->stepping | |
3088 | || !reinsert_breakpoint_inserted_here (event_child->stop_pc))) | |
8090aef2 | 3089 | { |
dd373349 AT |
3090 | int increment_pc = 0; |
3091 | int breakpoint_kind = 0; | |
3092 | CORE_ADDR stop_pc = event_child->stop_pc; | |
3093 | ||
769ef81f AT |
3094 | breakpoint_kind = |
3095 | the_target->breakpoint_kind_from_current_state (&stop_pc); | |
dd373349 | 3096 | the_target->sw_breakpoint_from_kind (breakpoint_kind, &increment_pc); |
8090aef2 PA |
3097 | |
3098 | if (debug_threads) | |
3099 | { | |
3100 | debug_printf ("step-over for %s executed software breakpoint\n", | |
3101 | target_pid_to_str (ptid_of (current_thread))); | |
3102 | } | |
3103 | ||
3104 | if (increment_pc != 0) | |
3105 | { | |
3106 | struct regcache *regcache | |
3107 | = get_thread_regcache (current_thread, 1); | |
3108 | ||
3109 | event_child->stop_pc += increment_pc; | |
3110 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
3111 | ||
3112 | if (!(*the_low_target.breakpoint_at) (event_child->stop_pc)) | |
15c66dd6 | 3113 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
3114 | } |
3115 | } | |
3116 | ||
6bf5e0ba PA |
3117 | /* If this event was not handled before, and is not a SIGTRAP, we |
3118 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
3119 | a breakpoint is inserted at the current PC. If this target does | |
3120 | not support internal breakpoints at all, we also report the | |
3121 | SIGTRAP without further processing; it's of no concern to us. */ | |
3122 | maybe_internal_trap | |
3123 | = (supports_breakpoints () | |
3124 | && (WSTOPSIG (w) == SIGTRAP | |
3125 | || ((WSTOPSIG (w) == SIGILL | |
3126 | || WSTOPSIG (w) == SIGSEGV) | |
3127 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
3128 | ||
3129 | if (maybe_internal_trap) | |
3130 | { | |
3131 | /* Handle anything that requires bookkeeping before deciding to | |
3132 | report the event or continue waiting. */ | |
3133 | ||
3134 | /* First check if we can explain the SIGTRAP with an internal | |
3135 | breakpoint, or if we should possibly report the event to GDB. | |
3136 | Do this before anything that may remove or insert a | |
3137 | breakpoint. */ | |
3138 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
3139 | ||
3140 | /* We have a SIGTRAP, possibly a step-over dance has just | |
3141 | finished. If so, tweak the state machine accordingly, | |
3142 | reinsert breakpoints and delete any reinsert (software | |
3143 | single-step) breakpoints. */ | |
3144 | step_over_finished = finish_step_over (event_child); | |
3145 | ||
3146 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
3147 | check_breakpoints (event_child->stop_pc); | |
3148 | ||
219f2f23 PA |
3149 | /* Handle tracepoint data collecting. This may overflow the |
3150 | trace buffer, and cause a tracing stop, removing | |
3151 | breakpoints. */ | |
3152 | trace_event = handle_tracepoints (event_child); | |
3153 | ||
6bf5e0ba PA |
3154 | if (bp_explains_trap) |
3155 | { | |
3156 | /* If we stepped or ran into an internal breakpoint, we've | |
3157 | already handled it. So next time we resume (from this | |
3158 | PC), we should step over it. */ | |
3159 | if (debug_threads) | |
87ce2a04 | 3160 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3161 | |
8b07ae33 PA |
3162 | if (breakpoint_here (event_child->stop_pc)) |
3163 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
3164 | } |
3165 | } | |
3166 | else | |
3167 | { | |
3168 | /* We have some other signal, possibly a step-over dance was in | |
3169 | progress, and it should be cancelled too. */ | |
3170 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
3171 | } |
3172 | ||
3173 | /* We have all the data we need. Either report the event to GDB, or | |
3174 | resume threads and keep waiting for more. */ | |
3175 | ||
3176 | /* If we're collecting a fast tracepoint, finish the collection and | |
3177 | move out of the jump pad before delivering a signal. See | |
3178 | linux_stabilize_threads. */ | |
3179 | ||
3180 | if (WIFSTOPPED (w) | |
3181 | && WSTOPSIG (w) != SIGTRAP | |
3182 | && supports_fast_tracepoints () | |
58b4daa5 | 3183 | && agent_loaded_p ()) |
fa593d66 PA |
3184 | { |
3185 | if (debug_threads) | |
87ce2a04 DE |
3186 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
3187 | "to defer or adjust it.\n", | |
0bfdf32f | 3188 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3189 | |
3190 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 3191 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
3192 | && maybe_move_out_of_jump_pad (event_child, &w)) |
3193 | { | |
3194 | enqueue_one_deferred_signal (event_child, &w); | |
3195 | ||
3196 | if (debug_threads) | |
87ce2a04 | 3197 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 3198 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3199 | |
3200 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
582511be PA |
3201 | |
3202 | return ignore_event (ourstatus); | |
fa593d66 PA |
3203 | } |
3204 | } | |
219f2f23 | 3205 | |
fa593d66 PA |
3206 | if (event_child->collecting_fast_tracepoint) |
3207 | { | |
3208 | if (debug_threads) | |
87ce2a04 DE |
3209 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
3210 | "Check if we're already there.\n", | |
0bfdf32f | 3211 | lwpid_of (current_thread), |
87ce2a04 | 3212 | event_child->collecting_fast_tracepoint); |
fa593d66 PA |
3213 | |
3214 | trace_event = 1; | |
3215 | ||
3216 | event_child->collecting_fast_tracepoint | |
3217 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3218 | ||
3219 | if (event_child->collecting_fast_tracepoint != 1) | |
3220 | { | |
3221 | /* No longer need this breakpoint. */ | |
3222 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3223 | { | |
3224 | if (debug_threads) | |
87ce2a04 DE |
3225 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
3226 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
3227 | |
3228 | /* Other running threads could hit this breakpoint. | |
3229 | We don't handle moribund locations like GDB does, | |
3230 | instead we always pause all threads when removing | |
3231 | breakpoints, so that any step-over or | |
3232 | decr_pc_after_break adjustment is always taken | |
3233 | care of while the breakpoint is still | |
3234 | inserted. */ | |
3235 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3236 | |
3237 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3238 | event_child->exit_jump_pad_bkpt = NULL; | |
3239 | ||
3240 | unstop_all_lwps (1, event_child); | |
3241 | ||
3242 | gdb_assert (event_child->suspended >= 0); | |
3243 | } | |
3244 | } | |
3245 | ||
3246 | if (event_child->collecting_fast_tracepoint == 0) | |
3247 | { | |
3248 | if (debug_threads) | |
87ce2a04 DE |
3249 | debug_printf ("fast tracepoint finished " |
3250 | "collecting successfully.\n"); | |
fa593d66 PA |
3251 | |
3252 | /* We may have a deferred signal to report. */ | |
3253 | if (dequeue_one_deferred_signal (event_child, &w)) | |
3254 | { | |
3255 | if (debug_threads) | |
87ce2a04 | 3256 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 3257 | } |
3c11dd79 | 3258 | else |
fa593d66 | 3259 | { |
3c11dd79 | 3260 | if (debug_threads) |
87ce2a04 | 3261 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
3262 | |
3263 | if (stabilizing_threads) | |
3264 | { | |
3265 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 3266 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
3267 | |
3268 | if (debug_threads) | |
3269 | { | |
3270 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
3271 | "while stabilizing threads\n", | |
0bfdf32f | 3272 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
3273 | debug_exit (); |
3274 | } | |
3275 | ||
0bfdf32f | 3276 | return ptid_of (current_thread); |
fa593d66 PA |
3277 | } |
3278 | } | |
3279 | } | |
6bf5e0ba PA |
3280 | } |
3281 | ||
e471f25b PA |
3282 | /* Check whether GDB would be interested in this event. */ |
3283 | ||
3284 | /* If GDB is not interested in this signal, don't stop other | |
3285 | threads, and don't report it to GDB. Just resume the inferior | |
3286 | right away. We do this for threading-related signals as well as | |
3287 | any that GDB specifically requested we ignore. But never ignore | |
3288 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3289 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3290 | handler. Also never ignore signals that could be caused by a |
3291 | breakpoint. */ | |
e471f25b PA |
3292 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
3293 | thread library? */ | |
3294 | if (WIFSTOPPED (w) | |
0bfdf32f | 3295 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3296 | && ( |
1a981360 | 3297 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3298 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3299 | && (WSTOPSIG (w) == __SIGRTMIN |
3300 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3301 | || | |
3302 | #endif | |
2ea28649 | 3303 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3304 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3305 | && current_thread->last_resume_kind == resume_stop) |
3306 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3307 | { |
3308 | siginfo_t info, *info_p; | |
3309 | ||
3310 | if (debug_threads) | |
87ce2a04 | 3311 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 3312 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 3313 | |
0bfdf32f | 3314 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3315 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3316 | info_p = &info; |
3317 | else | |
3318 | info_p = NULL; | |
863d01bd PA |
3319 | |
3320 | if (step_over_finished) | |
3321 | { | |
3322 | /* We cancelled this thread's step-over above. We still | |
3323 | need to unsuspend all other LWPs, and set them back | |
3324 | running again while the signal handler runs. */ | |
3325 | unsuspend_all_lwps (event_child); | |
3326 | ||
3327 | /* Enqueue the pending signal info so that proceed_all_lwps | |
3328 | doesn't lose it. */ | |
3329 | enqueue_pending_signal (event_child, WSTOPSIG (w), info_p); | |
3330 | ||
3331 | proceed_all_lwps (); | |
3332 | } | |
3333 | else | |
3334 | { | |
3335 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3336 | WSTOPSIG (w), info_p); | |
3337 | } | |
582511be | 3338 | return ignore_event (ourstatus); |
e471f25b PA |
3339 | } |
3340 | ||
c2d6af84 PA |
3341 | /* Note that all addresses are always "out of the step range" when |
3342 | there's no range to begin with. */ | |
3343 | in_step_range = lwp_in_step_range (event_child); | |
3344 | ||
3345 | /* If GDB wanted this thread to single step, and the thread is out | |
3346 | of the step range, we always want to report the SIGTRAP, and let | |
3347 | GDB handle it. Watchpoints should always be reported. So should | |
3348 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3349 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3350 | do, we're be able to handle GDB breakpoints on top of internal | |
3351 | breakpoints, by handling the internal breakpoint and still | |
3352 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
863d01bd PA |
3353 | won't see the breakpoint hit. If we see a single-step event but |
3354 | the thread should be continuing, don't pass the trap to gdb. | |
3355 | That indicates that we had previously finished a single-step but | |
3356 | left the single-step pending -- see | |
3357 | complete_ongoing_step_over. */ | |
6bf5e0ba | 3358 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3359 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3360 | && !in_step_range) |
15c66dd6 | 3361 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
863d01bd PA |
3362 | || (!in_step_range |
3363 | && !bp_explains_trap | |
3364 | && !trace_event | |
3365 | && !step_over_finished | |
3366 | && !(current_thread->last_resume_kind == resume_continue | |
3367 | && event_child->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP)) | |
9f3a5c85 | 3368 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3369 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e | 3370 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
00db26fa | 3371 | || event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE); |
d3ce09f5 SS |
3372 | |
3373 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3374 | |
3375 | /* We found no reason GDB would want us to stop. We either hit one | |
3376 | of our own breakpoints, or finished an internal step GDB | |
3377 | shouldn't know about. */ | |
3378 | if (!report_to_gdb) | |
3379 | { | |
3380 | if (debug_threads) | |
3381 | { | |
3382 | if (bp_explains_trap) | |
87ce2a04 | 3383 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3384 | if (step_over_finished) |
87ce2a04 | 3385 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 3386 | if (trace_event) |
87ce2a04 | 3387 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 3388 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
3389 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
3390 | paddress (event_child->stop_pc), | |
3391 | paddress (event_child->step_range_start), | |
3392 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3393 | } |
3394 | ||
3395 | /* We're not reporting this breakpoint to GDB, so apply the | |
3396 | decr_pc_after_break adjustment to the inferior's regcache | |
3397 | ourselves. */ | |
3398 | ||
3399 | if (the_low_target.set_pc != NULL) | |
3400 | { | |
3401 | struct regcache *regcache | |
0bfdf32f | 3402 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
3403 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
3404 | } | |
3405 | ||
7984d532 PA |
3406 | /* We may have finished stepping over a breakpoint. If so, |
3407 | we've stopped and suspended all LWPs momentarily except the | |
3408 | stepping one. This is where we resume them all again. We're | |
3409 | going to keep waiting, so use proceed, which handles stepping | |
3410 | over the next breakpoint. */ | |
6bf5e0ba | 3411 | if (debug_threads) |
87ce2a04 | 3412 | debug_printf ("proceeding all threads.\n"); |
7984d532 PA |
3413 | |
3414 | if (step_over_finished) | |
3415 | unsuspend_all_lwps (event_child); | |
3416 | ||
6bf5e0ba | 3417 | proceed_all_lwps (); |
582511be | 3418 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3419 | } |
3420 | ||
3421 | if (debug_threads) | |
3422 | { | |
00db26fa | 3423 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
ad071a30 PA |
3424 | { |
3425 | char *str; | |
3426 | ||
3427 | str = target_waitstatus_to_string (&event_child->waitstatus); | |
3428 | debug_printf ("LWP %ld: extended event with waitstatus %s\n", | |
3429 | lwpid_of (get_lwp_thread (event_child)), str); | |
3430 | xfree (str); | |
3431 | } | |
0bfdf32f | 3432 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
3433 | { |
3434 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 3435 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 3436 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 3437 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 3438 | } |
15c66dd6 | 3439 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 3440 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 3441 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 3442 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 3443 | if (debug_threads) |
87ce2a04 | 3444 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
3445 | } |
3446 | ||
3447 | /* Alright, we're going to report a stop. */ | |
3448 | ||
582511be | 3449 | if (!stabilizing_threads) |
6bf5e0ba PA |
3450 | { |
3451 | /* In all-stop, stop all threads. */ | |
582511be PA |
3452 | if (!non_stop) |
3453 | stop_all_lwps (0, NULL); | |
6bf5e0ba PA |
3454 | |
3455 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3456 | from among those that have had events. Giving equal priority | |
3457 | to all LWPs that have had events helps prevent | |
3458 | starvation. */ | |
3459 | if (ptid_equal (ptid, minus_one_ptid)) | |
3460 | { | |
3461 | event_child->status_pending_p = 1; | |
3462 | event_child->status_pending = w; | |
3463 | ||
3464 | select_event_lwp (&event_child); | |
3465 | ||
0bfdf32f GB |
3466 | /* current_thread and event_child must stay in sync. */ |
3467 | current_thread = get_lwp_thread (event_child); | |
ee1e2d4f | 3468 | |
6bf5e0ba PA |
3469 | event_child->status_pending_p = 0; |
3470 | w = event_child->status_pending; | |
3471 | } | |
3472 | ||
c03e6ccc | 3473 | if (step_over_finished) |
582511be PA |
3474 | { |
3475 | if (!non_stop) | |
3476 | { | |
3477 | /* If we were doing a step-over, all other threads but | |
3478 | the stepping one had been paused in start_step_over, | |
3479 | with their suspend counts incremented. We don't want | |
3480 | to do a full unstop/unpause, because we're in | |
3481 | all-stop mode (so we want threads stopped), but we | |
3482 | still need to unsuspend the other threads, to | |
3483 | decrement their `suspended' count back. */ | |
3484 | unsuspend_all_lwps (event_child); | |
3485 | } | |
3486 | else | |
3487 | { | |
3488 | /* If we just finished a step-over, then all threads had | |
3489 | been momentarily paused. In all-stop, that's fine, | |
3490 | we want threads stopped by now anyway. In non-stop, | |
3491 | we need to re-resume threads that GDB wanted to be | |
3492 | running. */ | |
3493 | unstop_all_lwps (1, event_child); | |
3494 | } | |
3495 | } | |
c03e6ccc | 3496 | |
fa593d66 | 3497 | /* Stabilize threads (move out of jump pads). */ |
582511be PA |
3498 | if (!non_stop) |
3499 | stabilize_threads (); | |
6bf5e0ba PA |
3500 | } |
3501 | else | |
3502 | { | |
3503 | /* If we just finished a step-over, then all threads had been | |
3504 | momentarily paused. In all-stop, that's fine, we want | |
3505 | threads stopped by now anyway. In non-stop, we need to | |
3506 | re-resume threads that GDB wanted to be running. */ | |
3507 | if (step_over_finished) | |
7984d532 | 3508 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3509 | } |
3510 | ||
00db26fa | 3511 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
de0d863e | 3512 | { |
00db26fa PA |
3513 | /* If the reported event is an exit, fork, vfork or exec, let |
3514 | GDB know. */ | |
3515 | *ourstatus = event_child->waitstatus; | |
de0d863e DB |
3516 | /* Clear the event lwp's waitstatus since we handled it already. */ |
3517 | event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3518 | } | |
3519 | else | |
3520 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
5b1c542e | 3521 | |
582511be | 3522 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3523 | it was a software breakpoint, and the client doesn't know we can |
3524 | adjust the breakpoint ourselves. */ | |
3525 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3526 | && !swbreak_feature) | |
582511be PA |
3527 | { |
3528 | int decr_pc = the_low_target.decr_pc_after_break; | |
3529 | ||
3530 | if (decr_pc != 0) | |
3531 | { | |
3532 | struct regcache *regcache | |
3533 | = get_thread_regcache (current_thread, 1); | |
3534 | (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc); | |
3535 | } | |
3536 | } | |
3537 | ||
0bfdf32f | 3538 | if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3539 | && WSTOPSIG (w) == SIGSTOP) |
bd99dc85 PA |
3540 | { |
3541 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3542 | and it stopped cleanly, so report as SIG0. The use of | |
3543 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3544 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3545 | } |
0bfdf32f | 3546 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3547 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3548 | { |
3549 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3550 | but, it stopped for other reasons. */ |
2ea28649 | 3551 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 | 3552 | } |
de0d863e | 3553 | else if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
bd99dc85 | 3554 | { |
2ea28649 | 3555 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3556 | } |
3557 | ||
d50171e4 PA |
3558 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
3559 | ||
bd99dc85 | 3560 | if (debug_threads) |
87ce2a04 DE |
3561 | { |
3562 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
0bfdf32f | 3563 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3564 | ourstatus->kind, ourstatus->value.sig); |
3565 | debug_exit (); | |
3566 | } | |
bd99dc85 | 3567 | |
65706a29 PA |
3568 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3569 | return filter_exit_event (event_child, ourstatus); | |
3570 | ||
0bfdf32f | 3571 | return ptid_of (current_thread); |
bd99dc85 PA |
3572 | } |
3573 | ||
3574 | /* Get rid of any pending event in the pipe. */ | |
3575 | static void | |
3576 | async_file_flush (void) | |
3577 | { | |
3578 | int ret; | |
3579 | char buf; | |
3580 | ||
3581 | do | |
3582 | ret = read (linux_event_pipe[0], &buf, 1); | |
3583 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3584 | } | |
3585 | ||
3586 | /* Put something in the pipe, so the event loop wakes up. */ | |
3587 | static void | |
3588 | async_file_mark (void) | |
3589 | { | |
3590 | int ret; | |
3591 | ||
3592 | async_file_flush (); | |
3593 | ||
3594 | do | |
3595 | ret = write (linux_event_pipe[1], "+", 1); | |
3596 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3597 | ||
3598 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3599 | be awakened anyway. */ | |
3600 | } | |
3601 | ||
95954743 PA |
3602 | static ptid_t |
3603 | linux_wait (ptid_t ptid, | |
3604 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 3605 | { |
95954743 | 3606 | ptid_t event_ptid; |
bd99dc85 | 3607 | |
bd99dc85 PA |
3608 | /* Flush the async file first. */ |
3609 | if (target_is_async_p ()) | |
3610 | async_file_flush (); | |
3611 | ||
582511be PA |
3612 | do |
3613 | { | |
3614 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); | |
3615 | } | |
3616 | while ((target_options & TARGET_WNOHANG) == 0 | |
3617 | && ptid_equal (event_ptid, null_ptid) | |
3618 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); | |
bd99dc85 PA |
3619 | |
3620 | /* If at least one stop was reported, there may be more. A single | |
3621 | SIGCHLD can signal more than one child stop. */ | |
3622 | if (target_is_async_p () | |
3623 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 3624 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
3625 | async_file_mark (); |
3626 | ||
3627 | return event_ptid; | |
da6d8c04 DJ |
3628 | } |
3629 | ||
c5f62d5f | 3630 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3631 | |
3632 | static int | |
a1928bad | 3633 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3634 | { |
c5f62d5f DE |
3635 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
3636 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 3637 | |
c5f62d5f DE |
3638 | #ifdef __NR_tkill |
3639 | { | |
3640 | static int tkill_failed; | |
fd500816 | 3641 | |
c5f62d5f DE |
3642 | if (!tkill_failed) |
3643 | { | |
3644 | int ret; | |
3645 | ||
3646 | errno = 0; | |
3647 | ret = syscall (__NR_tkill, lwpid, signo); | |
3648 | if (errno != ENOSYS) | |
3649 | return ret; | |
3650 | tkill_failed = 1; | |
3651 | } | |
3652 | } | |
fd500816 DJ |
3653 | #endif |
3654 | ||
3655 | return kill (lwpid, signo); | |
3656 | } | |
3657 | ||
964e4306 PA |
3658 | void |
3659 | linux_stop_lwp (struct lwp_info *lwp) | |
3660 | { | |
3661 | send_sigstop (lwp); | |
3662 | } | |
3663 | ||
0d62e5e8 | 3664 | static void |
02fc4de7 | 3665 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3666 | { |
bd99dc85 | 3667 | int pid; |
0d62e5e8 | 3668 | |
d86d4aaf | 3669 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3670 | |
0d62e5e8 DJ |
3671 | /* If we already have a pending stop signal for this process, don't |
3672 | send another. */ | |
54a0b537 | 3673 | if (lwp->stop_expected) |
0d62e5e8 | 3674 | { |
ae13219e | 3675 | if (debug_threads) |
87ce2a04 | 3676 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3677 | |
0d62e5e8 DJ |
3678 | return; |
3679 | } | |
3680 | ||
3681 | if (debug_threads) | |
87ce2a04 | 3682 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3683 | |
d50171e4 | 3684 | lwp->stop_expected = 1; |
bd99dc85 | 3685 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3686 | } |
3687 | ||
7984d532 PA |
3688 | static int |
3689 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 | 3690 | { |
d86d4aaf DE |
3691 | struct thread_info *thread = (struct thread_info *) entry; |
3692 | struct lwp_info *lwp = get_thread_lwp (thread); | |
02fc4de7 | 3693 | |
7984d532 PA |
3694 | /* Ignore EXCEPT. */ |
3695 | if (lwp == except) | |
3696 | return 0; | |
3697 | ||
02fc4de7 | 3698 | if (lwp->stopped) |
7984d532 | 3699 | return 0; |
02fc4de7 PA |
3700 | |
3701 | send_sigstop (lwp); | |
7984d532 PA |
3702 | return 0; |
3703 | } | |
3704 | ||
3705 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3706 | yet. */ | |
3707 | static int | |
3708 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
3709 | void *except) | |
3710 | { | |
d86d4aaf DE |
3711 | struct thread_info *thread = (struct thread_info *) entry; |
3712 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
3713 | |
3714 | /* Ignore EXCEPT. */ | |
3715 | if (lwp == except) | |
3716 | return 0; | |
3717 | ||
863d01bd | 3718 | lwp_suspended_inc (lwp); |
7984d532 PA |
3719 | |
3720 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
3721 | } |
3722 | ||
95954743 PA |
3723 | static void |
3724 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3725 | { | |
95954743 PA |
3726 | /* Store the exit status for later. */ |
3727 | lwp->status_pending_p = 1; | |
3728 | lwp->status_pending = wstat; | |
3729 | ||
00db26fa PA |
3730 | /* Store in waitstatus as well, as there's nothing else to process |
3731 | for this event. */ | |
3732 | if (WIFEXITED (wstat)) | |
3733 | { | |
3734 | lwp->waitstatus.kind = TARGET_WAITKIND_EXITED; | |
3735 | lwp->waitstatus.value.integer = WEXITSTATUS (wstat); | |
3736 | } | |
3737 | else if (WIFSIGNALED (wstat)) | |
3738 | { | |
3739 | lwp->waitstatus.kind = TARGET_WAITKIND_SIGNALLED; | |
3740 | lwp->waitstatus.value.sig = gdb_signal_from_host (WTERMSIG (wstat)); | |
3741 | } | |
3742 | ||
95954743 PA |
3743 | /* Prevent trying to stop it. */ |
3744 | lwp->stopped = 1; | |
3745 | ||
3746 | /* No further stops are expected from a dead lwp. */ | |
3747 | lwp->stop_expected = 0; | |
3748 | } | |
3749 | ||
00db26fa PA |
3750 | /* Return true if LWP has exited already, and has a pending exit event |
3751 | to report to GDB. */ | |
3752 | ||
3753 | static int | |
3754 | lwp_is_marked_dead (struct lwp_info *lwp) | |
3755 | { | |
3756 | return (lwp->status_pending_p | |
3757 | && (WIFEXITED (lwp->status_pending) | |
3758 | || WIFSIGNALED (lwp->status_pending))); | |
3759 | } | |
3760 | ||
fa96cb38 PA |
3761 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
3762 | ||
0d62e5e8 | 3763 | static void |
fa96cb38 | 3764 | wait_for_sigstop (void) |
0d62e5e8 | 3765 | { |
0bfdf32f | 3766 | struct thread_info *saved_thread; |
95954743 | 3767 | ptid_t saved_tid; |
fa96cb38 PA |
3768 | int wstat; |
3769 | int ret; | |
0d62e5e8 | 3770 | |
0bfdf32f GB |
3771 | saved_thread = current_thread; |
3772 | if (saved_thread != NULL) | |
3773 | saved_tid = saved_thread->entry.id; | |
bd99dc85 | 3774 | else |
95954743 | 3775 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3776 | |
d50171e4 | 3777 | if (debug_threads) |
fa96cb38 | 3778 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3779 | |
fa96cb38 PA |
3780 | /* Passing NULL_PTID as filter indicates we want all events to be |
3781 | left pending. Eventually this returns when there are no | |
3782 | unwaited-for children left. */ | |
3783 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
3784 | &wstat, __WALL); | |
3785 | gdb_assert (ret == -1); | |
0d62e5e8 | 3786 | |
0bfdf32f GB |
3787 | if (saved_thread == NULL || linux_thread_alive (saved_tid)) |
3788 | current_thread = saved_thread; | |
0d62e5e8 DJ |
3789 | else |
3790 | { | |
3791 | if (debug_threads) | |
87ce2a04 | 3792 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3793 | |
f0db101d PA |
3794 | /* We can't change the current inferior behind GDB's back, |
3795 | otherwise, a subsequent command may apply to the wrong | |
3796 | process. */ | |
3797 | current_thread = NULL; | |
0d62e5e8 DJ |
3798 | } |
3799 | } | |
3800 | ||
fa593d66 PA |
3801 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3802 | move it out, because we need to report the stop event to GDB. For | |
3803 | example, if the user puts a breakpoint in the jump pad, it's | |
3804 | because she wants to debug it. */ | |
3805 | ||
3806 | static int | |
3807 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3808 | { | |
d86d4aaf DE |
3809 | struct thread_info *thread = (struct thread_info *) entry; |
3810 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 | 3811 | |
863d01bd PA |
3812 | if (lwp->suspended != 0) |
3813 | { | |
3814 | internal_error (__FILE__, __LINE__, | |
3815 | "LWP %ld is suspended, suspended=%d\n", | |
3816 | lwpid_of (thread), lwp->suspended); | |
3817 | } | |
fa593d66 PA |
3818 | gdb_assert (lwp->stopped); |
3819 | ||
3820 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3821 | return (supports_fast_tracepoints () | |
58b4daa5 | 3822 | && agent_loaded_p () |
fa593d66 | 3823 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 3824 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3825 | || thread->last_resume_kind == resume_step) |
3826 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3827 | } | |
3828 | ||
3829 | static void | |
3830 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3831 | { | |
d86d4aaf | 3832 | struct thread_info *thread = (struct thread_info *) entry; |
f0ce0d3a | 3833 | struct thread_info *saved_thread; |
d86d4aaf | 3834 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 PA |
3835 | int *wstat; |
3836 | ||
863d01bd PA |
3837 | if (lwp->suspended != 0) |
3838 | { | |
3839 | internal_error (__FILE__, __LINE__, | |
3840 | "LWP %ld is suspended, suspended=%d\n", | |
3841 | lwpid_of (thread), lwp->suspended); | |
3842 | } | |
fa593d66 PA |
3843 | gdb_assert (lwp->stopped); |
3844 | ||
f0ce0d3a PA |
3845 | /* For gdb_breakpoint_here. */ |
3846 | saved_thread = current_thread; | |
3847 | current_thread = thread; | |
3848 | ||
fa593d66 PA |
3849 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; |
3850 | ||
3851 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3852 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 3853 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3854 | && thread->last_resume_kind != resume_step |
3855 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3856 | { | |
3857 | if (debug_threads) | |
87ce2a04 | 3858 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3859 | lwpid_of (thread)); |
fa593d66 PA |
3860 | |
3861 | if (wstat) | |
3862 | { | |
3863 | lwp->status_pending_p = 0; | |
3864 | enqueue_one_deferred_signal (lwp, wstat); | |
3865 | ||
3866 | if (debug_threads) | |
87ce2a04 DE |
3867 | debug_printf ("Signal %d for LWP %ld deferred " |
3868 | "(in jump pad)\n", | |
d86d4aaf | 3869 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
3870 | } |
3871 | ||
3872 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3873 | } | |
3874 | else | |
863d01bd | 3875 | lwp_suspended_inc (lwp); |
f0ce0d3a PA |
3876 | |
3877 | current_thread = saved_thread; | |
fa593d66 PA |
3878 | } |
3879 | ||
3880 | static int | |
3881 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3882 | { | |
d86d4aaf DE |
3883 | struct thread_info *thread = (struct thread_info *) entry; |
3884 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 | 3885 | |
00db26fa | 3886 | if (lwp_is_marked_dead (lwp)) |
fa593d66 PA |
3887 | return 0; |
3888 | if (lwp->stopped) | |
3889 | return 0; | |
3890 | return 1; | |
3891 | } | |
3892 | ||
7984d532 PA |
3893 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3894 | If SUSPEND, then also increase the suspend count of every LWP, | |
3895 | except EXCEPT. */ | |
3896 | ||
0d62e5e8 | 3897 | static void |
7984d532 | 3898 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3899 | { |
bde24c0a PA |
3900 | /* Should not be called recursively. */ |
3901 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3902 | ||
87ce2a04 DE |
3903 | if (debug_threads) |
3904 | { | |
3905 | debug_enter (); | |
3906 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
3907 | suspend ? "stop-and-suspend" : "stop", | |
3908 | except != NULL | |
d86d4aaf | 3909 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
3910 | : "none"); |
3911 | } | |
3912 | ||
bde24c0a PA |
3913 | stopping_threads = (suspend |
3914 | ? STOPPING_AND_SUSPENDING_THREADS | |
3915 | : STOPPING_THREADS); | |
7984d532 PA |
3916 | |
3917 | if (suspend) | |
d86d4aaf | 3918 | find_inferior (&all_threads, suspend_and_send_sigstop_callback, except); |
7984d532 | 3919 | else |
d86d4aaf | 3920 | find_inferior (&all_threads, send_sigstop_callback, except); |
fa96cb38 | 3921 | wait_for_sigstop (); |
bde24c0a | 3922 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
3923 | |
3924 | if (debug_threads) | |
3925 | { | |
3926 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
3927 | "back to !stopping\n"); | |
3928 | debug_exit (); | |
3929 | } | |
0d62e5e8 DJ |
3930 | } |
3931 | ||
863d01bd PA |
3932 | /* Enqueue one signal in the chain of signals which need to be |
3933 | delivered to this process on next resume. */ | |
3934 | ||
3935 | static void | |
3936 | enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info) | |
3937 | { | |
8d749320 | 3938 | struct pending_signals *p_sig = XNEW (struct pending_signals); |
863d01bd | 3939 | |
863d01bd PA |
3940 | p_sig->prev = lwp->pending_signals; |
3941 | p_sig->signal = signal; | |
3942 | if (info == NULL) | |
3943 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3944 | else | |
3945 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
3946 | lwp->pending_signals = p_sig; | |
3947 | } | |
3948 | ||
23f238d3 PA |
3949 | /* Resume execution of LWP. If STEP is nonzero, single-step it. If |
3950 | SIGNAL is nonzero, give it that signal. */ | |
da6d8c04 | 3951 | |
ce3a066d | 3952 | static void |
23f238d3 PA |
3953 | linux_resume_one_lwp_throw (struct lwp_info *lwp, |
3954 | int step, int signal, siginfo_t *info) | |
da6d8c04 | 3955 | { |
d86d4aaf | 3956 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 3957 | struct thread_info *saved_thread; |
fa593d66 | 3958 | int fast_tp_collecting; |
c06cbd92 YQ |
3959 | struct process_info *proc = get_thread_process (thread); |
3960 | ||
3961 | /* Note that target description may not be initialised | |
3962 | (proc->tdesc == NULL) at this point because the program hasn't | |
3963 | stopped at the first instruction yet. It means GDBserver skips | |
3964 | the extra traps from the wrapper program (see option --wrapper). | |
3965 | Code in this function that requires register access should be | |
3966 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 3967 | |
54a0b537 | 3968 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3969 | return; |
3970 | ||
65706a29 PA |
3971 | gdb_assert (lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
3972 | ||
fa593d66 PA |
3973 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3974 | ||
3975 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3976 | ||
219f2f23 PA |
3977 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3978 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 3979 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
3980 | { |
3981 | /* Collecting 'while-stepping' actions doesn't make sense | |
3982 | anymore. */ | |
d86d4aaf | 3983 | release_while_stepping_state_list (thread); |
219f2f23 PA |
3984 | } |
3985 | ||
0d62e5e8 DJ |
3986 | /* If we have pending signals or status, and a new signal, enqueue the |
3987 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3988 | breakpoint; it will be picked up again below. */ | |
3989 | if (signal != 0 | |
fa593d66 PA |
3990 | && (lwp->status_pending_p |
3991 | || lwp->pending_signals != NULL | |
3992 | || lwp->bp_reinsert != 0 | |
3993 | || fast_tp_collecting)) | |
0d62e5e8 | 3994 | { |
8d749320 SM |
3995 | struct pending_signals *p_sig = XNEW (struct pending_signals); |
3996 | ||
54a0b537 | 3997 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3998 | p_sig->signal = signal; |
32ca6d61 DJ |
3999 | if (info == NULL) |
4000 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
4001 | else | |
4002 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 4003 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
4004 | } |
4005 | ||
d50171e4 PA |
4006 | if (lwp->status_pending_p) |
4007 | { | |
4008 | if (debug_threads) | |
87ce2a04 DE |
4009 | debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);" |
4010 | " has pending status\n", | |
d86d4aaf | 4011 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 4012 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
4013 | return; |
4014 | } | |
0d62e5e8 | 4015 | |
0bfdf32f GB |
4016 | saved_thread = current_thread; |
4017 | current_thread = thread; | |
0d62e5e8 DJ |
4018 | |
4019 | if (debug_threads) | |
87ce2a04 | 4020 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", |
d86d4aaf | 4021 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 4022 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
4023 | |
4024 | /* This bit needs some thinking about. If we get a signal that | |
4025 | we must report while a single-step reinsert is still pending, | |
4026 | we often end up resuming the thread. It might be better to | |
4027 | (ew) allow a stack of pending events; then we could be sure that | |
4028 | the reinsert happened right away and not lose any signals. | |
4029 | ||
4030 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 4031 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
4032 | complete correctness, so it won't solve that problem. It may be |
4033 | worthwhile just to solve this one, however. */ | |
54a0b537 | 4034 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
4035 | { |
4036 | if (debug_threads) | |
87ce2a04 DE |
4037 | debug_printf (" pending reinsert at 0x%s\n", |
4038 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 4039 | |
85e00e85 | 4040 | if (can_hardware_single_step ()) |
d50171e4 | 4041 | { |
fa593d66 PA |
4042 | if (fast_tp_collecting == 0) |
4043 | { | |
4044 | if (step == 0) | |
4045 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
4046 | if (lwp->suspended) | |
4047 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
4048 | lwp->suspended); | |
4049 | } | |
d50171e4 PA |
4050 | |
4051 | step = 1; | |
4052 | } | |
0d62e5e8 DJ |
4053 | |
4054 | /* Postpone any pending signal. It was enqueued above. */ | |
4055 | signal = 0; | |
4056 | } | |
4057 | ||
fa593d66 PA |
4058 | if (fast_tp_collecting == 1) |
4059 | { | |
4060 | if (debug_threads) | |
87ce2a04 DE |
4061 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4062 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 4063 | lwpid_of (thread)); |
fa593d66 PA |
4064 | |
4065 | /* Postpone any pending signal. It was enqueued above. */ | |
4066 | signal = 0; | |
4067 | } | |
4068 | else if (fast_tp_collecting == 2) | |
4069 | { | |
4070 | if (debug_threads) | |
87ce2a04 DE |
4071 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4072 | " single-stepping\n", | |
d86d4aaf | 4073 | lwpid_of (thread)); |
fa593d66 PA |
4074 | |
4075 | if (can_hardware_single_step ()) | |
4076 | step = 1; | |
4077 | else | |
38e08fca GB |
4078 | { |
4079 | internal_error (__FILE__, __LINE__, | |
4080 | "moving out of jump pad single-stepping" | |
4081 | " not implemented on this target"); | |
4082 | } | |
fa593d66 PA |
4083 | |
4084 | /* Postpone any pending signal. It was enqueued above. */ | |
4085 | signal = 0; | |
4086 | } | |
4087 | ||
219f2f23 PA |
4088 | /* If we have while-stepping actions in this thread set it stepping. |
4089 | If we have a signal to deliver, it may or may not be set to | |
4090 | SIG_IGN, we don't know. Assume so, and allow collecting | |
4091 | while-stepping into a signal handler. A possible smart thing to | |
4092 | do would be to set an internal breakpoint at the signal return | |
4093 | address, continue, and carry on catching this while-stepping | |
4094 | action only when that breakpoint is hit. A future | |
4095 | enhancement. */ | |
d86d4aaf | 4096 | if (thread->while_stepping != NULL |
219f2f23 PA |
4097 | && can_hardware_single_step ()) |
4098 | { | |
4099 | if (debug_threads) | |
87ce2a04 | 4100 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 4101 | lwpid_of (thread)); |
219f2f23 PA |
4102 | step = 1; |
4103 | } | |
4104 | ||
c06cbd92 | 4105 | if (proc->tdesc != NULL && the_low_target.get_pc != NULL) |
0d62e5e8 | 4106 | { |
0bfdf32f | 4107 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be PA |
4108 | |
4109 | lwp->stop_pc = (*the_low_target.get_pc) (regcache); | |
4110 | ||
4111 | if (debug_threads) | |
4112 | { | |
4113 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
4114 | (long) lwp->stop_pc); | |
4115 | } | |
0d62e5e8 DJ |
4116 | } |
4117 | ||
fa593d66 PA |
4118 | /* If we have pending signals, consume one unless we are trying to |
4119 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
4120 | collect. */ | |
4121 | if (lwp->pending_signals != NULL | |
4122 | && lwp->bp_reinsert == 0 | |
4123 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
4124 | { |
4125 | struct pending_signals **p_sig; | |
4126 | ||
54a0b537 | 4127 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
4128 | while ((*p_sig)->prev != NULL) |
4129 | p_sig = &(*p_sig)->prev; | |
4130 | ||
4131 | signal = (*p_sig)->signal; | |
32ca6d61 | 4132 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 4133 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4134 | &(*p_sig)->info); |
32ca6d61 | 4135 | |
0d62e5e8 DJ |
4136 | free (*p_sig); |
4137 | *p_sig = NULL; | |
4138 | } | |
4139 | ||
aa5ca48f DE |
4140 | if (the_low_target.prepare_to_resume != NULL) |
4141 | the_low_target.prepare_to_resume (lwp); | |
4142 | ||
d86d4aaf | 4143 | regcache_invalidate_thread (thread); |
da6d8c04 | 4144 | errno = 0; |
54a0b537 | 4145 | lwp->stepping = step; |
d86d4aaf | 4146 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (thread), |
b8e1b30e | 4147 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
4148 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4149 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4150 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 4151 | |
0bfdf32f | 4152 | current_thread = saved_thread; |
da6d8c04 | 4153 | if (errno) |
23f238d3 PA |
4154 | perror_with_name ("resuming thread"); |
4155 | ||
4156 | /* Successfully resumed. Clear state that no longer makes sense, | |
4157 | and mark the LWP as running. Must not do this before resuming | |
4158 | otherwise if that fails other code will be confused. E.g., we'd | |
4159 | later try to stop the LWP and hang forever waiting for a stop | |
4160 | status. Note that we must not throw after this is cleared, | |
4161 | otherwise handle_zombie_lwp_error would get confused. */ | |
4162 | lwp->stopped = 0; | |
4163 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4164 | } | |
4165 | ||
4166 | /* Called when we try to resume a stopped LWP and that errors out. If | |
4167 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
4168 | or about to become), discard the error, clear any pending status | |
4169 | the LWP may have, and return true (we'll collect the exit status | |
4170 | soon enough). Otherwise, return false. */ | |
4171 | ||
4172 | static int | |
4173 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
4174 | { | |
4175 | struct thread_info *thread = get_lwp_thread (lp); | |
4176 | ||
4177 | /* If we get an error after resuming the LWP successfully, we'd | |
4178 | confuse !T state for the LWP being gone. */ | |
4179 | gdb_assert (lp->stopped); | |
4180 | ||
4181 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
4182 | because even if ptrace failed with ESRCH, the tracee may be "not | |
4183 | yet fully dead", but already refusing ptrace requests. In that | |
4184 | case the tracee has 'R (Running)' state for a little bit | |
4185 | (observed in Linux 3.18). See also the note on ESRCH in the | |
4186 | ptrace(2) man page. Instead, check whether the LWP has any state | |
4187 | other than ptrace-stopped. */ | |
4188 | ||
4189 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
4190 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 4191 | { |
23f238d3 PA |
4192 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
4193 | lp->status_pending_p = 0; | |
4194 | return 1; | |
4195 | } | |
4196 | return 0; | |
4197 | } | |
4198 | ||
4199 | /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP | |
4200 | disappears while we try to resume it. */ | |
3221518c | 4201 | |
23f238d3 PA |
4202 | static void |
4203 | linux_resume_one_lwp (struct lwp_info *lwp, | |
4204 | int step, int signal, siginfo_t *info) | |
4205 | { | |
4206 | TRY | |
4207 | { | |
4208 | linux_resume_one_lwp_throw (lwp, step, signal, info); | |
4209 | } | |
4210 | CATCH (ex, RETURN_MASK_ERROR) | |
4211 | { | |
4212 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
4213 | throw_exception (ex); | |
3221518c | 4214 | } |
23f238d3 | 4215 | END_CATCH |
da6d8c04 DJ |
4216 | } |
4217 | ||
2bd7c093 PA |
4218 | struct thread_resume_array |
4219 | { | |
4220 | struct thread_resume *resume; | |
4221 | size_t n; | |
4222 | }; | |
64386c31 | 4223 | |
ebcf782c DE |
4224 | /* This function is called once per thread via find_inferior. |
4225 | ARG is a pointer to a thread_resume_array struct. | |
4226 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
4227 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
4228 | |
4229 | This algorithm is O(threads * resume elements), but resume elements | |
4230 | is small (and will remain small at least until GDB supports thread | |
4231 | suspension). */ | |
ebcf782c | 4232 | |
2bd7c093 PA |
4233 | static int |
4234 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 4235 | { |
d86d4aaf DE |
4236 | struct thread_info *thread = (struct thread_info *) entry; |
4237 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 4238 | int ndx; |
2bd7c093 | 4239 | struct thread_resume_array *r; |
64386c31 | 4240 | |
9a3c8263 | 4241 | r = (struct thread_resume_array *) arg; |
64386c31 | 4242 | |
2bd7c093 | 4243 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
4244 | { |
4245 | ptid_t ptid = r->resume[ndx].thread; | |
4246 | if (ptid_equal (ptid, minus_one_ptid) | |
4247 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
4248 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
4249 | of PID'. */ | |
d86d4aaf | 4250 | || (ptid_get_pid (ptid) == pid_of (thread) |
0c9070b3 YQ |
4251 | && (ptid_is_pid (ptid) |
4252 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 4253 | { |
d50171e4 | 4254 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 4255 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4256 | { |
4257 | if (debug_threads) | |
87ce2a04 DE |
4258 | debug_printf ("already %s LWP %ld at GDB's request\n", |
4259 | (thread->last_status.kind | |
4260 | == TARGET_WAITKIND_STOPPED) | |
4261 | ? "stopped" | |
4262 | : "stopping", | |
d86d4aaf | 4263 | lwpid_of (thread)); |
d50171e4 PA |
4264 | |
4265 | continue; | |
4266 | } | |
4267 | ||
95954743 | 4268 | lwp->resume = &r->resume[ndx]; |
8336d594 | 4269 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 4270 | |
c2d6af84 PA |
4271 | lwp->step_range_start = lwp->resume->step_range_start; |
4272 | lwp->step_range_end = lwp->resume->step_range_end; | |
4273 | ||
fa593d66 PA |
4274 | /* If we had a deferred signal to report, dequeue one now. |
4275 | This can happen if LWP gets more than one signal while | |
4276 | trying to get out of a jump pad. */ | |
4277 | if (lwp->stopped | |
4278 | && !lwp->status_pending_p | |
4279 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
4280 | { | |
4281 | lwp->status_pending_p = 1; | |
4282 | ||
4283 | if (debug_threads) | |
87ce2a04 DE |
4284 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
4285 | "leaving status pending.\n", | |
d86d4aaf DE |
4286 | WSTOPSIG (lwp->status_pending), |
4287 | lwpid_of (thread)); | |
fa593d66 PA |
4288 | } |
4289 | ||
95954743 PA |
4290 | return 0; |
4291 | } | |
4292 | } | |
2bd7c093 PA |
4293 | |
4294 | /* No resume action for this thread. */ | |
4295 | lwp->resume = NULL; | |
64386c31 | 4296 | |
2bd7c093 | 4297 | return 0; |
5544ad89 DJ |
4298 | } |
4299 | ||
20ad9378 DE |
4300 | /* find_inferior callback for linux_resume. |
4301 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 4302 | |
bd99dc85 PA |
4303 | static int |
4304 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 4305 | { |
d86d4aaf DE |
4306 | struct thread_info *thread = (struct thread_info *) entry; |
4307 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 4308 | |
bd99dc85 PA |
4309 | /* LWPs which will not be resumed are not interesting, because |
4310 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4311 | if (lwp->resume == NULL) |
bd99dc85 | 4312 | return 0; |
64386c31 | 4313 | |
582511be | 4314 | if (thread_still_has_status_pending_p (thread)) |
d50171e4 PA |
4315 | * (int *) flag_p = 1; |
4316 | ||
4317 | return 0; | |
4318 | } | |
4319 | ||
4320 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
4321 | internal breakpoint that we need to step over. It assumes that any | |
4322 | required STOP_PC adjustment has already been propagated to the | |
4323 | inferior's regcache. */ | |
4324 | ||
4325 | static int | |
4326 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
4327 | { | |
d86d4aaf DE |
4328 | struct thread_info *thread = (struct thread_info *) entry; |
4329 | struct lwp_info *lwp = get_thread_lwp (thread); | |
0bfdf32f | 4330 | struct thread_info *saved_thread; |
d50171e4 | 4331 | CORE_ADDR pc; |
c06cbd92 YQ |
4332 | struct process_info *proc = get_thread_process (thread); |
4333 | ||
4334 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4335 | don't have to do step over. */ | |
4336 | if (proc->tdesc == NULL) | |
4337 | return 0; | |
d50171e4 PA |
4338 | |
4339 | /* LWPs which will not be resumed are not interesting, because we | |
4340 | might not wait for them next time through linux_wait. */ | |
4341 | ||
4342 | if (!lwp->stopped) | |
4343 | { | |
4344 | if (debug_threads) | |
87ce2a04 | 4345 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 4346 | lwpid_of (thread)); |
d50171e4 PA |
4347 | return 0; |
4348 | } | |
4349 | ||
8336d594 | 4350 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4351 | { |
4352 | if (debug_threads) | |
87ce2a04 DE |
4353 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
4354 | " stopped\n", | |
d86d4aaf | 4355 | lwpid_of (thread)); |
d50171e4 PA |
4356 | return 0; |
4357 | } | |
4358 | ||
7984d532 PA |
4359 | gdb_assert (lwp->suspended >= 0); |
4360 | ||
4361 | if (lwp->suspended) | |
4362 | { | |
4363 | if (debug_threads) | |
87ce2a04 | 4364 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 4365 | lwpid_of (thread)); |
7984d532 PA |
4366 | return 0; |
4367 | } | |
4368 | ||
d50171e4 PA |
4369 | if (!lwp->need_step_over) |
4370 | { | |
4371 | if (debug_threads) | |
d86d4aaf | 4372 | debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread)); |
d50171e4 | 4373 | } |
5544ad89 | 4374 | |
bd99dc85 | 4375 | if (lwp->status_pending_p) |
d50171e4 PA |
4376 | { |
4377 | if (debug_threads) | |
87ce2a04 DE |
4378 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
4379 | " status.\n", | |
d86d4aaf | 4380 | lwpid_of (thread)); |
d50171e4 PA |
4381 | return 0; |
4382 | } | |
4383 | ||
4384 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4385 | or we have. */ | |
4386 | pc = get_pc (lwp); | |
4387 | ||
4388 | /* If the PC has changed since we stopped, then don't do anything, | |
4389 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4390 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4391 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4392 | command, or poked thread's registers herself. */ | |
4393 | if (pc != lwp->stop_pc) | |
4394 | { | |
4395 | if (debug_threads) | |
87ce2a04 DE |
4396 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
4397 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
4398 | lwpid_of (thread), |
4399 | paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
4400 | |
4401 | lwp->need_step_over = 0; | |
4402 | return 0; | |
4403 | } | |
4404 | ||
0bfdf32f GB |
4405 | saved_thread = current_thread; |
4406 | current_thread = thread; | |
d50171e4 | 4407 | |
8b07ae33 | 4408 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4409 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4410 | { |
8b07ae33 | 4411 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4412 | though. If the condition is being evaluated on the target's side |
4413 | and it evaluate to false, step over this breakpoint as well. */ | |
4414 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4415 | && gdb_condition_true_at_breakpoint (pc) |
4416 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
4417 | { |
4418 | if (debug_threads) | |
87ce2a04 DE |
4419 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
4420 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 4421 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4422 | |
0bfdf32f | 4423 | current_thread = saved_thread; |
8b07ae33 PA |
4424 | return 0; |
4425 | } | |
4426 | else | |
4427 | { | |
4428 | if (debug_threads) | |
87ce2a04 DE |
4429 | debug_printf ("Need step over [LWP %ld]? yes, " |
4430 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 4431 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4432 | |
8b07ae33 PA |
4433 | /* We've found an lwp that needs stepping over --- return 1 so |
4434 | that find_inferior stops looking. */ | |
0bfdf32f | 4435 | current_thread = saved_thread; |
8b07ae33 PA |
4436 | |
4437 | /* If the step over is cancelled, this is set again. */ | |
4438 | lwp->need_step_over = 0; | |
4439 | return 1; | |
4440 | } | |
d50171e4 PA |
4441 | } |
4442 | ||
0bfdf32f | 4443 | current_thread = saved_thread; |
d50171e4 PA |
4444 | |
4445 | if (debug_threads) | |
87ce2a04 DE |
4446 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
4447 | " at 0x%s\n", | |
d86d4aaf | 4448 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 4449 | |
bd99dc85 | 4450 | return 0; |
5544ad89 DJ |
4451 | } |
4452 | ||
d50171e4 PA |
4453 | /* Start a step-over operation on LWP. When LWP stopped at a |
4454 | breakpoint, to make progress, we need to remove the breakpoint out | |
4455 | of the way. If we let other threads run while we do that, they may | |
4456 | pass by the breakpoint location and miss hitting it. To avoid | |
4457 | that, a step-over momentarily stops all threads while LWP is | |
4458 | single-stepped while the breakpoint is temporarily uninserted from | |
4459 | the inferior. When the single-step finishes, we reinsert the | |
4460 | breakpoint, and let all threads that are supposed to be running, | |
4461 | run again. | |
4462 | ||
4463 | On targets that don't support hardware single-step, we don't | |
4464 | currently support full software single-stepping. Instead, we only | |
4465 | support stepping over the thread event breakpoint, by asking the | |
4466 | low target where to place a reinsert breakpoint. Since this | |
4467 | routine assumes the breakpoint being stepped over is a thread event | |
4468 | breakpoint, it usually assumes the return address of the current | |
4469 | function is a good enough place to set the reinsert breakpoint. */ | |
4470 | ||
4471 | static int | |
4472 | start_step_over (struct lwp_info *lwp) | |
4473 | { | |
d86d4aaf | 4474 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4475 | struct thread_info *saved_thread; |
d50171e4 PA |
4476 | CORE_ADDR pc; |
4477 | int step; | |
4478 | ||
4479 | if (debug_threads) | |
87ce2a04 | 4480 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 4481 | lwpid_of (thread)); |
d50171e4 | 4482 | |
7984d532 | 4483 | stop_all_lwps (1, lwp); |
863d01bd PA |
4484 | |
4485 | if (lwp->suspended != 0) | |
4486 | { | |
4487 | internal_error (__FILE__, __LINE__, | |
4488 | "LWP %ld suspended=%d\n", lwpid_of (thread), | |
4489 | lwp->suspended); | |
4490 | } | |
d50171e4 PA |
4491 | |
4492 | if (debug_threads) | |
87ce2a04 | 4493 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
4494 | |
4495 | /* Note, we should always reach here with an already adjusted PC, | |
4496 | either by GDB (if we're resuming due to GDB's request), or by our | |
4497 | caller, if we just finished handling an internal breakpoint GDB | |
4498 | shouldn't care about. */ | |
4499 | pc = get_pc (lwp); | |
4500 | ||
0bfdf32f GB |
4501 | saved_thread = current_thread; |
4502 | current_thread = thread; | |
d50171e4 PA |
4503 | |
4504 | lwp->bp_reinsert = pc; | |
4505 | uninsert_breakpoints_at (pc); | |
fa593d66 | 4506 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
4507 | |
4508 | if (can_hardware_single_step ()) | |
4509 | { | |
4510 | step = 1; | |
4511 | } | |
4512 | else | |
4513 | { | |
4514 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
4515 | set_reinsert_breakpoint (raddr); | |
4516 | step = 0; | |
4517 | } | |
4518 | ||
0bfdf32f | 4519 | current_thread = saved_thread; |
d50171e4 PA |
4520 | |
4521 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
4522 | ||
4523 | /* Require next event from this LWP. */ | |
d86d4aaf | 4524 | step_over_bkpt = thread->entry.id; |
d50171e4 PA |
4525 | return 1; |
4526 | } | |
4527 | ||
4528 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
4529 | start_step_over, if still there, and delete any reinsert | |
4530 | breakpoints we've set, on non hardware single-step targets. */ | |
4531 | ||
4532 | static int | |
4533 | finish_step_over (struct lwp_info *lwp) | |
4534 | { | |
4535 | if (lwp->bp_reinsert != 0) | |
4536 | { | |
4537 | if (debug_threads) | |
87ce2a04 | 4538 | debug_printf ("Finished step over.\n"); |
d50171e4 PA |
4539 | |
4540 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
4541 | may be no breakpoint to reinsert there by now. */ | |
4542 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4543 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4544 | |
4545 | lwp->bp_reinsert = 0; | |
4546 | ||
4547 | /* Delete any software-single-step reinsert breakpoints. No | |
4548 | longer needed. We don't have to worry about other threads | |
4549 | hitting this trap, and later not being able to explain it, | |
4550 | because we were stepping over a breakpoint, and we hold all | |
4551 | threads but LWP stopped while doing that. */ | |
4552 | if (!can_hardware_single_step ()) | |
4553 | delete_reinsert_breakpoints (); | |
4554 | ||
4555 | step_over_bkpt = null_ptid; | |
4556 | return 1; | |
4557 | } | |
4558 | else | |
4559 | return 0; | |
4560 | } | |
4561 | ||
863d01bd PA |
4562 | /* If there's a step over in progress, wait until all threads stop |
4563 | (that is, until the stepping thread finishes its step), and | |
4564 | unsuspend all lwps. The stepping thread ends with its status | |
4565 | pending, which is processed later when we get back to processing | |
4566 | events. */ | |
4567 | ||
4568 | static void | |
4569 | complete_ongoing_step_over (void) | |
4570 | { | |
4571 | if (!ptid_equal (step_over_bkpt, null_ptid)) | |
4572 | { | |
4573 | struct lwp_info *lwp; | |
4574 | int wstat; | |
4575 | int ret; | |
4576 | ||
4577 | if (debug_threads) | |
4578 | debug_printf ("detach: step over in progress, finish it first\n"); | |
4579 | ||
4580 | /* Passing NULL_PTID as filter indicates we want all events to | |
4581 | be left pending. Eventually this returns when there are no | |
4582 | unwaited-for children left. */ | |
4583 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
4584 | &wstat, __WALL); | |
4585 | gdb_assert (ret == -1); | |
4586 | ||
4587 | lwp = find_lwp_pid (step_over_bkpt); | |
4588 | if (lwp != NULL) | |
4589 | finish_step_over (lwp); | |
4590 | step_over_bkpt = null_ptid; | |
4591 | unsuspend_all_lwps (lwp); | |
4592 | } | |
4593 | } | |
4594 | ||
5544ad89 DJ |
4595 | /* This function is called once per thread. We check the thread's resume |
4596 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 4597 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 4598 | |
bd99dc85 PA |
4599 | For threads which we aren't explicitly told otherwise, we preserve |
4600 | the stepping flag; this is used for stepping over gdbserver-placed | |
4601 | breakpoints. | |
4602 | ||
4603 | If pending_flags was set in any thread, we queue any needed | |
4604 | signals, since we won't actually resume. We already have a pending | |
4605 | event to report, so we don't need to preserve any step requests; | |
4606 | they should be re-issued if necessary. */ | |
4607 | ||
4608 | static int | |
4609 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 4610 | { |
d86d4aaf DE |
4611 | struct thread_info *thread = (struct thread_info *) entry; |
4612 | struct lwp_info *lwp = get_thread_lwp (thread); | |
bd99dc85 | 4613 | int step; |
d50171e4 PA |
4614 | int leave_all_stopped = * (int *) arg; |
4615 | int leave_pending; | |
5544ad89 | 4616 | |
2bd7c093 | 4617 | if (lwp->resume == NULL) |
bd99dc85 | 4618 | return 0; |
5544ad89 | 4619 | |
bd99dc85 | 4620 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 4621 | { |
bd99dc85 | 4622 | if (debug_threads) |
d86d4aaf | 4623 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
4624 | |
4625 | if (!lwp->stopped) | |
4626 | { | |
4627 | if (debug_threads) | |
d86d4aaf | 4628 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 4629 | |
d50171e4 PA |
4630 | /* Stop the thread, and wait for the event asynchronously, |
4631 | through the event loop. */ | |
02fc4de7 | 4632 | send_sigstop (lwp); |
bd99dc85 PA |
4633 | } |
4634 | else | |
4635 | { | |
4636 | if (debug_threads) | |
87ce2a04 | 4637 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 4638 | lwpid_of (thread)); |
d50171e4 PA |
4639 | |
4640 | /* The LWP may have been stopped in an internal event that | |
4641 | was not meant to be notified back to GDB (e.g., gdbserver | |
4642 | breakpoint), so we should be reporting a stop event in | |
4643 | this case too. */ | |
4644 | ||
4645 | /* If the thread already has a pending SIGSTOP, this is a | |
4646 | no-op. Otherwise, something later will presumably resume | |
4647 | the thread and this will cause it to cancel any pending | |
4648 | operation, due to last_resume_kind == resume_stop. If | |
4649 | the thread already has a pending status to report, we | |
4650 | will still report it the next time we wait - see | |
4651 | status_pending_p_callback. */ | |
1a981360 PA |
4652 | |
4653 | /* If we already have a pending signal to report, then | |
4654 | there's no need to queue a SIGSTOP, as this means we're | |
4655 | midway through moving the LWP out of the jumppad, and we | |
4656 | will report the pending signal as soon as that is | |
4657 | finished. */ | |
4658 | if (lwp->pending_signals_to_report == NULL) | |
4659 | send_sigstop (lwp); | |
bd99dc85 | 4660 | } |
32ca6d61 | 4661 | |
bd99dc85 PA |
4662 | /* For stop requests, we're done. */ |
4663 | lwp->resume = NULL; | |
fc7238bb | 4664 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4665 | return 0; |
5544ad89 DJ |
4666 | } |
4667 | ||
bd99dc85 | 4668 | /* If this thread which is about to be resumed has a pending status, |
863d01bd PA |
4669 | then don't resume it - we can just report the pending status. |
4670 | Likewise if it is suspended, because e.g., another thread is | |
4671 | stepping past a breakpoint. Make sure to queue any signals that | |
4672 | would otherwise be sent. In all-stop mode, we do this decision | |
4673 | based on if *any* thread has a pending status. If there's a | |
4674 | thread that needs the step-over-breakpoint dance, then don't | |
4675 | resume any other thread but that particular one. */ | |
4676 | leave_pending = (lwp->suspended | |
4677 | || lwp->status_pending_p | |
4678 | || leave_all_stopped); | |
5544ad89 | 4679 | |
d50171e4 | 4680 | if (!leave_pending) |
bd99dc85 PA |
4681 | { |
4682 | if (debug_threads) | |
d86d4aaf | 4683 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 4684 | |
d50171e4 | 4685 | step = (lwp->resume->kind == resume_step); |
2acc282a | 4686 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
4687 | } |
4688 | else | |
4689 | { | |
4690 | if (debug_threads) | |
d86d4aaf | 4691 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
5544ad89 | 4692 | |
bd99dc85 PA |
4693 | /* If we have a new signal, enqueue the signal. */ |
4694 | if (lwp->resume->sig != 0) | |
4695 | { | |
8d749320 SM |
4696 | struct pending_signals *p_sig = XCNEW (struct pending_signals); |
4697 | ||
bd99dc85 PA |
4698 | p_sig->prev = lwp->pending_signals; |
4699 | p_sig->signal = lwp->resume->sig; | |
bd99dc85 PA |
4700 | |
4701 | /* If this is the same signal we were previously stopped by, | |
4702 | make sure to queue its siginfo. We can ignore the return | |
4703 | value of ptrace; if it fails, we'll skip | |
4704 | PTRACE_SETSIGINFO. */ | |
4705 | if (WIFSTOPPED (lwp->last_status) | |
4706 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
d86d4aaf | 4707 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4708 | &p_sig->info); |
bd99dc85 PA |
4709 | |
4710 | lwp->pending_signals = p_sig; | |
4711 | } | |
4712 | } | |
5544ad89 | 4713 | |
fc7238bb | 4714 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4715 | lwp->resume = NULL; |
5544ad89 | 4716 | return 0; |
0d62e5e8 DJ |
4717 | } |
4718 | ||
4719 | static void | |
2bd7c093 | 4720 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 4721 | { |
2bd7c093 | 4722 | struct thread_resume_array array = { resume_info, n }; |
d86d4aaf | 4723 | struct thread_info *need_step_over = NULL; |
d50171e4 PA |
4724 | int any_pending; |
4725 | int leave_all_stopped; | |
c6ecbae5 | 4726 | |
87ce2a04 DE |
4727 | if (debug_threads) |
4728 | { | |
4729 | debug_enter (); | |
4730 | debug_printf ("linux_resume:\n"); | |
4731 | } | |
4732 | ||
2bd7c093 | 4733 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 4734 | |
d50171e4 PA |
4735 | /* If there is a thread which would otherwise be resumed, which has |
4736 | a pending status, then don't resume any threads - we can just | |
4737 | report the pending status. Make sure to queue any signals that | |
4738 | would otherwise be sent. In non-stop mode, we'll apply this | |
4739 | logic to each thread individually. We consume all pending events | |
4740 | before considering to start a step-over (in all-stop). */ | |
4741 | any_pending = 0; | |
bd99dc85 | 4742 | if (!non_stop) |
d86d4aaf | 4743 | find_inferior (&all_threads, resume_status_pending_p, &any_pending); |
d50171e4 PA |
4744 | |
4745 | /* If there is a thread which would otherwise be resumed, which is | |
4746 | stopped at a breakpoint that needs stepping over, then don't | |
4747 | resume any threads - have it step over the breakpoint with all | |
4748 | other threads stopped, then resume all threads again. Make sure | |
4749 | to queue any signals that would otherwise be delivered or | |
4750 | queued. */ | |
4751 | if (!any_pending && supports_breakpoints ()) | |
4752 | need_step_over | |
d86d4aaf DE |
4753 | = (struct thread_info *) find_inferior (&all_threads, |
4754 | need_step_over_p, NULL); | |
d50171e4 PA |
4755 | |
4756 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
4757 | ||
4758 | if (debug_threads) | |
4759 | { | |
4760 | if (need_step_over != NULL) | |
87ce2a04 | 4761 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 4762 | else if (any_pending) |
87ce2a04 DE |
4763 | debug_printf ("Not resuming, all-stop and found " |
4764 | "an LWP with pending status\n"); | |
d50171e4 | 4765 | else |
87ce2a04 | 4766 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4767 | } |
4768 | ||
4769 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4770 | otherwise deliver. */ | |
4771 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
4772 | ||
4773 | if (need_step_over) | |
d86d4aaf | 4774 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4775 | |
4776 | if (debug_threads) | |
4777 | { | |
4778 | debug_printf ("linux_resume done\n"); | |
4779 | debug_exit (); | |
4780 | } | |
1bebeeca PA |
4781 | |
4782 | /* We may have events that were pending that can/should be sent to | |
4783 | the client now. Trigger a linux_wait call. */ | |
4784 | if (target_is_async_p ()) | |
4785 | async_file_mark (); | |
d50171e4 PA |
4786 | } |
4787 | ||
4788 | /* This function is called once per thread. We check the thread's | |
4789 | last resume request, which will tell us whether to resume, step, or | |
4790 | leave the thread stopped. Any signal the client requested to be | |
4791 | delivered has already been enqueued at this point. | |
4792 | ||
4793 | If any thread that GDB wants running is stopped at an internal | |
4794 | breakpoint that needs stepping over, we start a step-over operation | |
4795 | on that particular thread, and leave all others stopped. */ | |
4796 | ||
7984d532 PA |
4797 | static int |
4798 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 4799 | { |
d86d4aaf DE |
4800 | struct thread_info *thread = (struct thread_info *) entry; |
4801 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
4802 | int step; |
4803 | ||
7984d532 PA |
4804 | if (lwp == except) |
4805 | return 0; | |
d50171e4 PA |
4806 | |
4807 | if (debug_threads) | |
d86d4aaf | 4808 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4809 | |
4810 | if (!lwp->stopped) | |
4811 | { | |
4812 | if (debug_threads) | |
d86d4aaf | 4813 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
7984d532 | 4814 | return 0; |
d50171e4 PA |
4815 | } |
4816 | ||
02fc4de7 PA |
4817 | if (thread->last_resume_kind == resume_stop |
4818 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4819 | { |
4820 | if (debug_threads) | |
87ce2a04 | 4821 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4822 | lwpid_of (thread)); |
7984d532 | 4823 | return 0; |
d50171e4 PA |
4824 | } |
4825 | ||
4826 | if (lwp->status_pending_p) | |
4827 | { | |
4828 | if (debug_threads) | |
87ce2a04 | 4829 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4830 | lwpid_of (thread)); |
7984d532 | 4831 | return 0; |
d50171e4 PA |
4832 | } |
4833 | ||
7984d532 PA |
4834 | gdb_assert (lwp->suspended >= 0); |
4835 | ||
d50171e4 PA |
4836 | if (lwp->suspended) |
4837 | { | |
4838 | if (debug_threads) | |
d86d4aaf | 4839 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
7984d532 | 4840 | return 0; |
d50171e4 PA |
4841 | } |
4842 | ||
1a981360 PA |
4843 | if (thread->last_resume_kind == resume_stop |
4844 | && lwp->pending_signals_to_report == NULL | |
4845 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
4846 | { |
4847 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4848 | last_status.kind check above would catch it, and we wouldn't | |
4849 | reach here. This LWP may have been momentarily paused by a | |
4850 | stop_all_lwps call while handling for example, another LWP's | |
4851 | step-over. In that case, the pending expected SIGSTOP signal | |
4852 | that was queued at vCont;t handling time will have already | |
4853 | been consumed by wait_for_sigstop, and so we need to requeue | |
4854 | another one here. Note that if the LWP already has a SIGSTOP | |
4855 | pending, this is a no-op. */ | |
4856 | ||
4857 | if (debug_threads) | |
87ce2a04 DE |
4858 | debug_printf ("Client wants LWP %ld to stop. " |
4859 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 4860 | lwpid_of (thread)); |
02fc4de7 PA |
4861 | |
4862 | send_sigstop (lwp); | |
4863 | } | |
4864 | ||
863d01bd PA |
4865 | if (thread->last_resume_kind == resume_step) |
4866 | { | |
4867 | if (debug_threads) | |
4868 | debug_printf (" stepping LWP %ld, client wants it stepping\n", | |
4869 | lwpid_of (thread)); | |
4870 | step = 1; | |
4871 | } | |
4872 | else if (lwp->bp_reinsert != 0) | |
4873 | { | |
4874 | if (debug_threads) | |
4875 | debug_printf (" stepping LWP %ld, reinsert set\n", | |
4876 | lwpid_of (thread)); | |
4877 | step = 1; | |
4878 | } | |
4879 | else | |
4880 | step = 0; | |
4881 | ||
d50171e4 | 4882 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
4883 | return 0; |
4884 | } | |
4885 | ||
4886 | static int | |
4887 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
4888 | { | |
d86d4aaf DE |
4889 | struct thread_info *thread = (struct thread_info *) entry; |
4890 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
4891 | |
4892 | if (lwp == except) | |
4893 | return 0; | |
4894 | ||
863d01bd | 4895 | lwp_suspended_decr (lwp); |
7984d532 PA |
4896 | |
4897 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
4898 | } |
4899 | ||
4900 | /* When we finish a step-over, set threads running again. If there's | |
4901 | another thread that may need a step-over, now's the time to start | |
4902 | it. Eventually, we'll move all threads past their breakpoints. */ | |
4903 | ||
4904 | static void | |
4905 | proceed_all_lwps (void) | |
4906 | { | |
d86d4aaf | 4907 | struct thread_info *need_step_over; |
d50171e4 PA |
4908 | |
4909 | /* If there is a thread which would otherwise be resumed, which is | |
4910 | stopped at a breakpoint that needs stepping over, then don't | |
4911 | resume any threads - have it step over the breakpoint with all | |
4912 | other threads stopped, then resume all threads again. */ | |
4913 | ||
4914 | if (supports_breakpoints ()) | |
4915 | { | |
4916 | need_step_over | |
d86d4aaf DE |
4917 | = (struct thread_info *) find_inferior (&all_threads, |
4918 | need_step_over_p, NULL); | |
d50171e4 PA |
4919 | |
4920 | if (need_step_over != NULL) | |
4921 | { | |
4922 | if (debug_threads) | |
87ce2a04 DE |
4923 | debug_printf ("proceed_all_lwps: found " |
4924 | "thread %ld needing a step-over\n", | |
4925 | lwpid_of (need_step_over)); | |
d50171e4 | 4926 | |
d86d4aaf | 4927 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
4928 | return; |
4929 | } | |
4930 | } | |
5544ad89 | 4931 | |
d50171e4 | 4932 | if (debug_threads) |
87ce2a04 | 4933 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 4934 | |
d86d4aaf | 4935 | find_inferior (&all_threads, proceed_one_lwp, NULL); |
d50171e4 PA |
4936 | } |
4937 | ||
4938 | /* Stopped LWPs that the client wanted to be running, that don't have | |
4939 | pending statuses, are set to run again, except for EXCEPT, if not | |
4940 | NULL. This undoes a stop_all_lwps call. */ | |
4941 | ||
4942 | static void | |
7984d532 | 4943 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 4944 | { |
5544ad89 DJ |
4945 | if (debug_threads) |
4946 | { | |
87ce2a04 | 4947 | debug_enter (); |
d50171e4 | 4948 | if (except) |
87ce2a04 | 4949 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 4950 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 4951 | else |
87ce2a04 | 4952 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
4953 | } |
4954 | ||
7984d532 | 4955 | if (unsuspend) |
d86d4aaf | 4956 | find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except); |
7984d532 | 4957 | else |
d86d4aaf | 4958 | find_inferior (&all_threads, proceed_one_lwp, except); |
87ce2a04 DE |
4959 | |
4960 | if (debug_threads) | |
4961 | { | |
4962 | debug_printf ("unstop_all_lwps done\n"); | |
4963 | debug_exit (); | |
4964 | } | |
0d62e5e8 DJ |
4965 | } |
4966 | ||
58caa3dc DJ |
4967 | |
4968 | #ifdef HAVE_LINUX_REGSETS | |
4969 | ||
1faeff08 MR |
4970 | #define use_linux_regsets 1 |
4971 | ||
030031ee PA |
4972 | /* Returns true if REGSET has been disabled. */ |
4973 | ||
4974 | static int | |
4975 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
4976 | { | |
4977 | return (info->disabled_regsets != NULL | |
4978 | && info->disabled_regsets[regset - info->regsets]); | |
4979 | } | |
4980 | ||
4981 | /* Disable REGSET. */ | |
4982 | ||
4983 | static void | |
4984 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
4985 | { | |
4986 | int dr_offset; | |
4987 | ||
4988 | dr_offset = regset - info->regsets; | |
4989 | if (info->disabled_regsets == NULL) | |
224c3ddb | 4990 | info->disabled_regsets = (char *) xcalloc (1, info->num_regsets); |
030031ee PA |
4991 | info->disabled_regsets[dr_offset] = 1; |
4992 | } | |
4993 | ||
58caa3dc | 4994 | static int |
3aee8918 PA |
4995 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
4996 | struct regcache *regcache) | |
58caa3dc DJ |
4997 | { |
4998 | struct regset_info *regset; | |
e9d25b98 | 4999 | int saw_general_regs = 0; |
95954743 | 5000 | int pid; |
1570b33e | 5001 | struct iovec iov; |
58caa3dc | 5002 | |
0bfdf32f | 5003 | pid = lwpid_of (current_thread); |
28eef672 | 5004 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5005 | { |
1570b33e L |
5006 | void *buf, *data; |
5007 | int nt_type, res; | |
58caa3dc | 5008 | |
030031ee | 5009 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 5010 | continue; |
58caa3dc | 5011 | |
bca929d3 | 5012 | buf = xmalloc (regset->size); |
1570b33e L |
5013 | |
5014 | nt_type = regset->nt_type; | |
5015 | if (nt_type) | |
5016 | { | |
5017 | iov.iov_base = buf; | |
5018 | iov.iov_len = regset->size; | |
5019 | data = (void *) &iov; | |
5020 | } | |
5021 | else | |
5022 | data = buf; | |
5023 | ||
dfb64f85 | 5024 | #ifndef __sparc__ |
f15f9948 | 5025 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5026 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5027 | #else |
1570b33e | 5028 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5029 | #endif |
58caa3dc DJ |
5030 | if (res < 0) |
5031 | { | |
5032 | if (errno == EIO) | |
5033 | { | |
52fa2412 | 5034 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 5035 | this process mode. */ |
030031ee | 5036 | disable_regset (regsets_info, regset); |
58caa3dc | 5037 | } |
e5a9158d AA |
5038 | else if (errno == ENODATA) |
5039 | { | |
5040 | /* ENODATA may be returned if the regset is currently | |
5041 | not "active". This can happen in normal operation, | |
5042 | so suppress the warning in this case. */ | |
5043 | } | |
58caa3dc DJ |
5044 | else |
5045 | { | |
0d62e5e8 | 5046 | char s[256]; |
95954743 PA |
5047 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
5048 | pid); | |
0d62e5e8 | 5049 | perror (s); |
58caa3dc DJ |
5050 | } |
5051 | } | |
098dbe61 AA |
5052 | else |
5053 | { | |
5054 | if (regset->type == GENERAL_REGS) | |
5055 | saw_general_regs = 1; | |
5056 | regset->store_function (regcache, buf); | |
5057 | } | |
fdeb2a12 | 5058 | free (buf); |
58caa3dc | 5059 | } |
e9d25b98 DJ |
5060 | if (saw_general_regs) |
5061 | return 0; | |
5062 | else | |
5063 | return 1; | |
58caa3dc DJ |
5064 | } |
5065 | ||
5066 | static int | |
3aee8918 PA |
5067 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
5068 | struct regcache *regcache) | |
58caa3dc DJ |
5069 | { |
5070 | struct regset_info *regset; | |
e9d25b98 | 5071 | int saw_general_regs = 0; |
95954743 | 5072 | int pid; |
1570b33e | 5073 | struct iovec iov; |
58caa3dc | 5074 | |
0bfdf32f | 5075 | pid = lwpid_of (current_thread); |
28eef672 | 5076 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5077 | { |
1570b33e L |
5078 | void *buf, *data; |
5079 | int nt_type, res; | |
58caa3dc | 5080 | |
feea5f36 AA |
5081 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
5082 | || regset->fill_function == NULL) | |
28eef672 | 5083 | continue; |
58caa3dc | 5084 | |
bca929d3 | 5085 | buf = xmalloc (regset->size); |
545587ee DJ |
5086 | |
5087 | /* First fill the buffer with the current register set contents, | |
5088 | in case there are any items in the kernel's regset that are | |
5089 | not in gdbserver's regcache. */ | |
1570b33e L |
5090 | |
5091 | nt_type = regset->nt_type; | |
5092 | if (nt_type) | |
5093 | { | |
5094 | iov.iov_base = buf; | |
5095 | iov.iov_len = regset->size; | |
5096 | data = (void *) &iov; | |
5097 | } | |
5098 | else | |
5099 | data = buf; | |
5100 | ||
dfb64f85 | 5101 | #ifndef __sparc__ |
f15f9948 | 5102 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5103 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5104 | #else |
689cc2ae | 5105 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5106 | #endif |
545587ee DJ |
5107 | |
5108 | if (res == 0) | |
5109 | { | |
5110 | /* Then overlay our cached registers on that. */ | |
442ea881 | 5111 | regset->fill_function (regcache, buf); |
545587ee DJ |
5112 | |
5113 | /* Only now do we write the register set. */ | |
dfb64f85 | 5114 | #ifndef __sparc__ |
f15f9948 | 5115 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 5116 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5117 | #else |
1570b33e | 5118 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 5119 | #endif |
545587ee DJ |
5120 | } |
5121 | ||
58caa3dc DJ |
5122 | if (res < 0) |
5123 | { | |
5124 | if (errno == EIO) | |
5125 | { | |
52fa2412 | 5126 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 5127 | this process mode. */ |
030031ee | 5128 | disable_regset (regsets_info, regset); |
58caa3dc | 5129 | } |
3221518c UW |
5130 | else if (errno == ESRCH) |
5131 | { | |
1b3f6016 PA |
5132 | /* At this point, ESRCH should mean the process is |
5133 | already gone, in which case we simply ignore attempts | |
5134 | to change its registers. See also the related | |
5135 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 5136 | free (buf); |
3221518c UW |
5137 | return 0; |
5138 | } | |
58caa3dc DJ |
5139 | else |
5140 | { | |
ce3a066d | 5141 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
5142 | } |
5143 | } | |
e9d25b98 DJ |
5144 | else if (regset->type == GENERAL_REGS) |
5145 | saw_general_regs = 1; | |
09ec9b38 | 5146 | free (buf); |
58caa3dc | 5147 | } |
e9d25b98 DJ |
5148 | if (saw_general_regs) |
5149 | return 0; | |
5150 | else | |
5151 | return 1; | |
58caa3dc DJ |
5152 | } |
5153 | ||
1faeff08 | 5154 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 5155 | |
1faeff08 | 5156 | #define use_linux_regsets 0 |
3aee8918 PA |
5157 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
5158 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 5159 | |
58caa3dc | 5160 | #endif |
1faeff08 MR |
5161 | |
5162 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
5163 | calls or 0 if it has to be transferred individually. */ | |
5164 | ||
5165 | static int | |
3aee8918 | 5166 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
5167 | { |
5168 | unsigned char mask = 1 << (regno % 8); | |
5169 | size_t index = regno / 8; | |
5170 | ||
5171 | return (use_linux_regsets | |
3aee8918 PA |
5172 | && (regs_info->regset_bitmap == NULL |
5173 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
5174 | } |
5175 | ||
58caa3dc | 5176 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
5177 | |
5178 | int | |
3aee8918 | 5179 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
5180 | { |
5181 | int addr; | |
5182 | ||
3aee8918 | 5183 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
5184 | error ("Invalid register number %d.", regnum); |
5185 | ||
3aee8918 | 5186 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
5187 | |
5188 | return addr; | |
5189 | } | |
5190 | ||
5191 | /* Fetch one register. */ | |
5192 | static void | |
3aee8918 PA |
5193 | fetch_register (const struct usrregs_info *usrregs, |
5194 | struct regcache *regcache, int regno) | |
1faeff08 MR |
5195 | { |
5196 | CORE_ADDR regaddr; | |
5197 | int i, size; | |
5198 | char *buf; | |
5199 | int pid; | |
5200 | ||
3aee8918 | 5201 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
5202 | return; |
5203 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
5204 | return; | |
5205 | ||
3aee8918 | 5206 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5207 | if (regaddr == -1) |
5208 | return; | |
5209 | ||
3aee8918 PA |
5210 | size = ((register_size (regcache->tdesc, regno) |
5211 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5212 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5213 | buf = (char *) alloca (size); |
1faeff08 | 5214 | |
0bfdf32f | 5215 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5216 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5217 | { | |
5218 | errno = 0; | |
5219 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
5220 | ptrace (PTRACE_PEEKUSER, pid, | |
5221 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5222 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5223 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
5224 | regaddr += sizeof (PTRACE_XFER_TYPE); |
5225 | if (errno != 0) | |
5226 | error ("reading register %d: %s", regno, strerror (errno)); | |
5227 | } | |
5228 | ||
5229 | if (the_low_target.supply_ptrace_register) | |
5230 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
5231 | else | |
5232 | supply_register (regcache, regno, buf); | |
5233 | } | |
5234 | ||
5235 | /* Store one register. */ | |
5236 | static void | |
3aee8918 PA |
5237 | store_register (const struct usrregs_info *usrregs, |
5238 | struct regcache *regcache, int regno) | |
1faeff08 MR |
5239 | { |
5240 | CORE_ADDR regaddr; | |
5241 | int i, size; | |
5242 | char *buf; | |
5243 | int pid; | |
5244 | ||
3aee8918 | 5245 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
5246 | return; |
5247 | if ((*the_low_target.cannot_store_register) (regno)) | |
5248 | return; | |
5249 | ||
3aee8918 | 5250 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5251 | if (regaddr == -1) |
5252 | return; | |
5253 | ||
3aee8918 PA |
5254 | size = ((register_size (regcache->tdesc, regno) |
5255 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5256 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5257 | buf = (char *) alloca (size); |
1faeff08 MR |
5258 | memset (buf, 0, size); |
5259 | ||
5260 | if (the_low_target.collect_ptrace_register) | |
5261 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
5262 | else | |
5263 | collect_register (regcache, regno, buf); | |
5264 | ||
0bfdf32f | 5265 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5266 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5267 | { | |
5268 | errno = 0; | |
5269 | ptrace (PTRACE_POKEUSER, pid, | |
5270 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5271 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5272 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
5273 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
5274 | if (errno != 0) |
5275 | { | |
5276 | /* At this point, ESRCH should mean the process is | |
5277 | already gone, in which case we simply ignore attempts | |
5278 | to change its registers. See also the related | |
5279 | comment in linux_resume_one_lwp. */ | |
5280 | if (errno == ESRCH) | |
5281 | return; | |
5282 | ||
5283 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
5284 | error ("writing register %d: %s", regno, strerror (errno)); | |
5285 | } | |
5286 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
5287 | } | |
5288 | } | |
5289 | ||
5290 | /* Fetch all registers, or just one, from the child process. | |
5291 | If REGNO is -1, do this for all registers, skipping any that are | |
5292 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
5293 | unless ALL is non-zero. | |
5294 | Otherwise, REGNO specifies which register (so we can save time). */ | |
5295 | static void | |
3aee8918 PA |
5296 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
5297 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 5298 | { |
3aee8918 PA |
5299 | struct usrregs_info *usr = regs_info->usrregs; |
5300 | ||
1faeff08 MR |
5301 | if (regno == -1) |
5302 | { | |
3aee8918 PA |
5303 | for (regno = 0; regno < usr->num_regs; regno++) |
5304 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5305 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
5306 | } |
5307 | else | |
3aee8918 | 5308 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
5309 | } |
5310 | ||
5311 | /* Store our register values back into the inferior. | |
5312 | If REGNO is -1, do this for all registers, skipping any that are | |
5313 | assumed to have been saved by regsets_store_inferior_registers, | |
5314 | unless ALL is non-zero. | |
5315 | Otherwise, REGNO specifies which register (so we can save time). */ | |
5316 | static void | |
3aee8918 PA |
5317 | usr_store_inferior_registers (const struct regs_info *regs_info, |
5318 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 5319 | { |
3aee8918 PA |
5320 | struct usrregs_info *usr = regs_info->usrregs; |
5321 | ||
1faeff08 MR |
5322 | if (regno == -1) |
5323 | { | |
3aee8918 PA |
5324 | for (regno = 0; regno < usr->num_regs; regno++) |
5325 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5326 | store_register (usr, regcache, regno); | |
1faeff08 MR |
5327 | } |
5328 | else | |
3aee8918 | 5329 | store_register (usr, regcache, regno); |
1faeff08 MR |
5330 | } |
5331 | ||
5332 | #else /* !HAVE_LINUX_USRREGS */ | |
5333 | ||
3aee8918 PA |
5334 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
5335 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 5336 | |
58caa3dc | 5337 | #endif |
1faeff08 MR |
5338 | |
5339 | ||
5340 | void | |
5341 | linux_fetch_registers (struct regcache *regcache, int regno) | |
5342 | { | |
5343 | int use_regsets; | |
5344 | int all = 0; | |
3aee8918 | 5345 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5346 | |
5347 | if (regno == -1) | |
5348 | { | |
3aee8918 PA |
5349 | if (the_low_target.fetch_register != NULL |
5350 | && regs_info->usrregs != NULL) | |
5351 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
5352 | (*the_low_target.fetch_register) (regcache, regno); |
5353 | ||
3aee8918 PA |
5354 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5355 | if (regs_info->usrregs != NULL) | |
5356 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5357 | } |
5358 | else | |
5359 | { | |
c14dfd32 PA |
5360 | if (the_low_target.fetch_register != NULL |
5361 | && (*the_low_target.fetch_register) (regcache, regno)) | |
5362 | return; | |
5363 | ||
3aee8918 | 5364 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5365 | if (use_regsets) |
3aee8918 PA |
5366 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5367 | regcache); | |
5368 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5369 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5370 | } |
58caa3dc DJ |
5371 | } |
5372 | ||
5373 | void | |
442ea881 | 5374 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 5375 | { |
1faeff08 MR |
5376 | int use_regsets; |
5377 | int all = 0; | |
3aee8918 | 5378 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5379 | |
5380 | if (regno == -1) | |
5381 | { | |
3aee8918 PA |
5382 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5383 | regcache); | |
5384 | if (regs_info->usrregs != NULL) | |
5385 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5386 | } |
5387 | else | |
5388 | { | |
3aee8918 | 5389 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5390 | if (use_regsets) |
3aee8918 PA |
5391 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5392 | regcache); | |
5393 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5394 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5395 | } |
58caa3dc DJ |
5396 | } |
5397 | ||
da6d8c04 | 5398 | |
da6d8c04 DJ |
5399 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
5400 | to debugger memory starting at MYADDR. */ | |
5401 | ||
c3e735a6 | 5402 | static int |
f450004a | 5403 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 5404 | { |
0bfdf32f | 5405 | int pid = lwpid_of (current_thread); |
4934b29e MR |
5406 | register PTRACE_XFER_TYPE *buffer; |
5407 | register CORE_ADDR addr; | |
5408 | register int count; | |
5409 | char filename[64]; | |
da6d8c04 | 5410 | register int i; |
4934b29e | 5411 | int ret; |
fd462a61 | 5412 | int fd; |
fd462a61 DJ |
5413 | |
5414 | /* Try using /proc. Don't bother for one word. */ | |
5415 | if (len >= 3 * sizeof (long)) | |
5416 | { | |
4934b29e MR |
5417 | int bytes; |
5418 | ||
fd462a61 DJ |
5419 | /* We could keep this file open and cache it - possibly one per |
5420 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5421 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5422 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5423 | if (fd == -1) | |
5424 | goto no_proc; | |
5425 | ||
5426 | /* If pread64 is available, use it. It's faster if the kernel | |
5427 | supports it (only one syscall), and it's 64-bit safe even on | |
5428 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5429 | application). */ | |
5430 | #ifdef HAVE_PREAD64 | |
4934b29e | 5431 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5432 | #else |
4934b29e MR |
5433 | bytes = -1; |
5434 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5435 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5436 | #endif |
fd462a61 DJ |
5437 | |
5438 | close (fd); | |
4934b29e MR |
5439 | if (bytes == len) |
5440 | return 0; | |
5441 | ||
5442 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5443 | if (bytes > 0) | |
5444 | { | |
5445 | memaddr += bytes; | |
5446 | myaddr += bytes; | |
5447 | len -= bytes; | |
5448 | } | |
fd462a61 | 5449 | } |
da6d8c04 | 5450 | |
fd462a61 | 5451 | no_proc: |
4934b29e MR |
5452 | /* Round starting address down to longword boundary. */ |
5453 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5454 | /* Round ending address up; get number of longwords that makes. */ | |
5455 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5456 | / sizeof (PTRACE_XFER_TYPE)); | |
5457 | /* Allocate buffer of that many longwords. */ | |
8d749320 | 5458 | buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
4934b29e | 5459 | |
da6d8c04 | 5460 | /* Read all the longwords */ |
4934b29e | 5461 | errno = 0; |
da6d8c04 DJ |
5462 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5463 | { | |
14ce3065 DE |
5464 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5465 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5466 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5467 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5468 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5469 | if (errno) |
4934b29e | 5470 | break; |
da6d8c04 | 5471 | } |
4934b29e | 5472 | ret = errno; |
da6d8c04 DJ |
5473 | |
5474 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5475 | if (i > 0) |
5476 | { | |
5477 | i *= sizeof (PTRACE_XFER_TYPE); | |
5478 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5479 | memcpy (myaddr, | |
5480 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5481 | i < len ? i : len); | |
5482 | } | |
c3e735a6 | 5483 | |
4934b29e | 5484 | return ret; |
da6d8c04 DJ |
5485 | } |
5486 | ||
93ae6fdc PA |
5487 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5488 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5489 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5490 | |
ce3a066d | 5491 | static int |
f450004a | 5492 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
5493 | { |
5494 | register int i; | |
5495 | /* Round starting address down to longword boundary. */ | |
5496 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5497 | /* Round ending address up; get number of longwords that makes. */ | |
5498 | register int count | |
493e2a69 MS |
5499 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5500 | / sizeof (PTRACE_XFER_TYPE); | |
5501 | ||
da6d8c04 | 5502 | /* Allocate buffer of that many longwords. */ |
8d749320 | 5503 | register PTRACE_XFER_TYPE *buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
493e2a69 | 5504 | |
0bfdf32f | 5505 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5506 | |
f0ae6fc3 PA |
5507 | if (len == 0) |
5508 | { | |
5509 | /* Zero length write always succeeds. */ | |
5510 | return 0; | |
5511 | } | |
5512 | ||
0d62e5e8 DJ |
5513 | if (debug_threads) |
5514 | { | |
58d6951d | 5515 | /* Dump up to four bytes. */ |
bf47e248 PA |
5516 | char str[4 * 2 + 1]; |
5517 | char *p = str; | |
5518 | int dump = len < 4 ? len : 4; | |
5519 | ||
5520 | for (i = 0; i < dump; i++) | |
5521 | { | |
5522 | sprintf (p, "%02x", myaddr[i]); | |
5523 | p += 2; | |
5524 | } | |
5525 | *p = '\0'; | |
5526 | ||
5527 | debug_printf ("Writing %s to 0x%08lx in process %d\n", | |
5528 | str, (long) memaddr, pid); | |
0d62e5e8 DJ |
5529 | } |
5530 | ||
da6d8c04 DJ |
5531 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
5532 | ||
93ae6fdc | 5533 | errno = 0; |
14ce3065 DE |
5534 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5535 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5536 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5537 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5538 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
5539 | if (errno) |
5540 | return errno; | |
da6d8c04 DJ |
5541 | |
5542 | if (count > 1) | |
5543 | { | |
93ae6fdc | 5544 | errno = 0; |
da6d8c04 | 5545 | buffer[count - 1] |
95954743 | 5546 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
5547 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
5548 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5549 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 5550 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 5551 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
5552 | if (errno) |
5553 | return errno; | |
da6d8c04 DJ |
5554 | } |
5555 | ||
93ae6fdc | 5556 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 5557 | |
493e2a69 MS |
5558 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
5559 | myaddr, len); | |
da6d8c04 DJ |
5560 | |
5561 | /* Write the entire buffer. */ | |
5562 | ||
5563 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
5564 | { | |
5565 | errno = 0; | |
14ce3065 DE |
5566 | ptrace (PTRACE_POKETEXT, pid, |
5567 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5568 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5569 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5570 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
5571 | if (errno) |
5572 | return errno; | |
5573 | } | |
5574 | ||
5575 | return 0; | |
5576 | } | |
2f2893d9 DJ |
5577 | |
5578 | static void | |
5579 | linux_look_up_symbols (void) | |
5580 | { | |
0d62e5e8 | 5581 | #ifdef USE_THREAD_DB |
95954743 PA |
5582 | struct process_info *proc = current_process (); |
5583 | ||
fe978cb0 | 5584 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
5585 | return; |
5586 | ||
96d7229d LM |
5587 | /* If the kernel supports tracing clones, then we don't need to |
5588 | use the magic thread event breakpoint to learn about | |
5589 | threads. */ | |
5590 | thread_db_init (!linux_supports_traceclone ()); | |
0d62e5e8 DJ |
5591 | #endif |
5592 | } | |
5593 | ||
e5379b03 | 5594 | static void |
ef57601b | 5595 | linux_request_interrupt (void) |
e5379b03 | 5596 | { |
a1928bad | 5597 | extern unsigned long signal_pid; |
e5379b03 | 5598 | |
78708b7c PA |
5599 | /* Send a SIGINT to the process group. This acts just like the user |
5600 | typed a ^C on the controlling terminal. */ | |
5601 | kill (-signal_pid, SIGINT); | |
e5379b03 DJ |
5602 | } |
5603 | ||
aa691b87 RM |
5604 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
5605 | to debugger memory starting at MYADDR. */ | |
5606 | ||
5607 | static int | |
f450004a | 5608 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
5609 | { |
5610 | char filename[PATH_MAX]; | |
5611 | int fd, n; | |
0bfdf32f | 5612 | int pid = lwpid_of (current_thread); |
aa691b87 | 5613 | |
6cebaf6e | 5614 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
5615 | |
5616 | fd = open (filename, O_RDONLY); | |
5617 | if (fd < 0) | |
5618 | return -1; | |
5619 | ||
5620 | if (offset != (CORE_ADDR) 0 | |
5621 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5622 | n = -1; | |
5623 | else | |
5624 | n = read (fd, myaddr, len); | |
5625 | ||
5626 | close (fd); | |
5627 | ||
5628 | return n; | |
5629 | } | |
5630 | ||
d993e290 PA |
5631 | /* These breakpoint and watchpoint related wrapper functions simply |
5632 | pass on the function call if the target has registered a | |
5633 | corresponding function. */ | |
e013ee27 OF |
5634 | |
5635 | static int | |
802e8e6d PA |
5636 | linux_supports_z_point_type (char z_type) |
5637 | { | |
5638 | return (the_low_target.supports_z_point_type != NULL | |
5639 | && the_low_target.supports_z_point_type (z_type)); | |
5640 | } | |
5641 | ||
5642 | static int | |
5643 | linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5644 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5645 | { |
c8f4bfdd YQ |
5646 | if (type == raw_bkpt_type_sw) |
5647 | return insert_memory_breakpoint (bp); | |
5648 | else if (the_low_target.insert_point != NULL) | |
802e8e6d | 5649 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
5650 | else |
5651 | /* Unsupported (see target.h). */ | |
5652 | return 1; | |
5653 | } | |
5654 | ||
5655 | static int | |
802e8e6d PA |
5656 | linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
5657 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5658 | { |
c8f4bfdd YQ |
5659 | if (type == raw_bkpt_type_sw) |
5660 | return remove_memory_breakpoint (bp); | |
5661 | else if (the_low_target.remove_point != NULL) | |
802e8e6d | 5662 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
5663 | else |
5664 | /* Unsupported (see target.h). */ | |
5665 | return 1; | |
5666 | } | |
5667 | ||
3e572f71 PA |
5668 | /* Implement the to_stopped_by_sw_breakpoint target_ops |
5669 | method. */ | |
5670 | ||
5671 | static int | |
5672 | linux_stopped_by_sw_breakpoint (void) | |
5673 | { | |
5674 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5675 | ||
5676 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
5677 | } | |
5678 | ||
5679 | /* Implement the to_supports_stopped_by_sw_breakpoint target_ops | |
5680 | method. */ | |
5681 | ||
5682 | static int | |
5683 | linux_supports_stopped_by_sw_breakpoint (void) | |
5684 | { | |
5685 | return USE_SIGTRAP_SIGINFO; | |
5686 | } | |
5687 | ||
5688 | /* Implement the to_stopped_by_hw_breakpoint target_ops | |
5689 | method. */ | |
5690 | ||
5691 | static int | |
5692 | linux_stopped_by_hw_breakpoint (void) | |
5693 | { | |
5694 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5695 | ||
5696 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
5697 | } | |
5698 | ||
5699 | /* Implement the to_supports_stopped_by_hw_breakpoint target_ops | |
5700 | method. */ | |
5701 | ||
5702 | static int | |
5703 | linux_supports_stopped_by_hw_breakpoint (void) | |
5704 | { | |
5705 | return USE_SIGTRAP_SIGINFO; | |
5706 | } | |
5707 | ||
70b90b91 | 5708 | /* Implement the supports_hardware_single_step target_ops method. */ |
45614f15 YQ |
5709 | |
5710 | static int | |
70b90b91 | 5711 | linux_supports_hardware_single_step (void) |
45614f15 | 5712 | { |
45614f15 YQ |
5713 | return can_hardware_single_step (); |
5714 | } | |
5715 | ||
e013ee27 OF |
5716 | static int |
5717 | linux_stopped_by_watchpoint (void) | |
5718 | { | |
0bfdf32f | 5719 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 5720 | |
15c66dd6 | 5721 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
5722 | } |
5723 | ||
5724 | static CORE_ADDR | |
5725 | linux_stopped_data_address (void) | |
5726 | { | |
0bfdf32f | 5727 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
5728 | |
5729 | return lwp->stopped_data_address; | |
e013ee27 OF |
5730 | } |
5731 | ||
db0dfaa0 LM |
5732 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
5733 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
5734 | && defined(PT_TEXT_END_ADDR) | |
5735 | ||
5736 | /* This is only used for targets that define PT_TEXT_ADDR, | |
5737 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
5738 | the target has different ways of acquiring this information, like | |
5739 | loadmaps. */ | |
52fb6437 NS |
5740 | |
5741 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
5742 | to tell gdb about. */ | |
5743 | ||
5744 | static int | |
5745 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
5746 | { | |
52fb6437 | 5747 | unsigned long text, text_end, data; |
62828379 | 5748 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
5749 | |
5750 | errno = 0; | |
5751 | ||
b8e1b30e LM |
5752 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
5753 | (PTRACE_TYPE_ARG4) 0); | |
5754 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
5755 | (PTRACE_TYPE_ARG4) 0); | |
5756 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
5757 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
5758 | |
5759 | if (errno == 0) | |
5760 | { | |
5761 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
5762 | used by gdb) are relative to the beginning of the program, |
5763 | with the data segment immediately following the text segment. | |
5764 | However, the actual runtime layout in memory may put the data | |
5765 | somewhere else, so when we send gdb a data base-address, we | |
5766 | use the real data base address and subtract the compile-time | |
5767 | data base-address from it (which is just the length of the | |
5768 | text segment). BSS immediately follows data in both | |
5769 | cases. */ | |
52fb6437 NS |
5770 | *text_p = text; |
5771 | *data_p = data - (text_end - text); | |
1b3f6016 | 5772 | |
52fb6437 NS |
5773 | return 1; |
5774 | } | |
52fb6437 NS |
5775 | return 0; |
5776 | } | |
5777 | #endif | |
5778 | ||
07e059b5 VP |
5779 | static int |
5780 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
5781 | unsigned char *readbuf, unsigned const char *writebuf, |
5782 | CORE_ADDR offset, int len) | |
07e059b5 | 5783 | { |
d26e3629 | 5784 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5785 | } |
5786 | ||
d0722149 DE |
5787 | /* Convert a native/host siginfo object, into/from the siginfo in the |
5788 | layout of the inferiors' architecture. */ | |
5789 | ||
5790 | static void | |
a5362b9a | 5791 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
5792 | { |
5793 | int done = 0; | |
5794 | ||
5795 | if (the_low_target.siginfo_fixup != NULL) | |
5796 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
5797 | ||
5798 | /* If there was no callback, or the callback didn't do anything, | |
5799 | then just do a straight memcpy. */ | |
5800 | if (!done) | |
5801 | { | |
5802 | if (direction == 1) | |
a5362b9a | 5803 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 5804 | else |
a5362b9a | 5805 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
5806 | } |
5807 | } | |
5808 | ||
4aa995e1 PA |
5809 | static int |
5810 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
5811 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
5812 | { | |
d0722149 | 5813 | int pid; |
a5362b9a TS |
5814 | siginfo_t siginfo; |
5815 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 | 5816 | |
0bfdf32f | 5817 | if (current_thread == NULL) |
4aa995e1 PA |
5818 | return -1; |
5819 | ||
0bfdf32f | 5820 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
5821 | |
5822 | if (debug_threads) | |
87ce2a04 DE |
5823 | debug_printf ("%s siginfo for lwp %d.\n", |
5824 | readbuf != NULL ? "Reading" : "Writing", | |
5825 | pid); | |
4aa995e1 | 5826 | |
0adea5f7 | 5827 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
5828 | return -1; |
5829 | ||
b8e1b30e | 5830 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5831 | return -1; |
5832 | ||
d0722149 DE |
5833 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
5834 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
5835 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
5836 | with a 32-bit GDBSERVER, we need to convert it. */ | |
5837 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
5838 | ||
4aa995e1 PA |
5839 | if (offset + len > sizeof (siginfo)) |
5840 | len = sizeof (siginfo) - offset; | |
5841 | ||
5842 | if (readbuf != NULL) | |
d0722149 | 5843 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
5844 | else |
5845 | { | |
d0722149 DE |
5846 | memcpy (inf_siginfo + offset, writebuf, len); |
5847 | ||
5848 | /* Convert back to ptrace layout before flushing it out. */ | |
5849 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
5850 | ||
b8e1b30e | 5851 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5852 | return -1; |
5853 | } | |
5854 | ||
5855 | return len; | |
5856 | } | |
5857 | ||
bd99dc85 PA |
5858 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5859 | so we notice when children change state; as the handler for the | |
5860 | sigsuspend in my_waitpid. */ | |
5861 | ||
5862 | static void | |
5863 | sigchld_handler (int signo) | |
5864 | { | |
5865 | int old_errno = errno; | |
5866 | ||
5867 | if (debug_threads) | |
e581f2b4 PA |
5868 | { |
5869 | do | |
5870 | { | |
5871 | /* fprintf is not async-signal-safe, so call write | |
5872 | directly. */ | |
5873 | if (write (2, "sigchld_handler\n", | |
5874 | sizeof ("sigchld_handler\n") - 1) < 0) | |
5875 | break; /* just ignore */ | |
5876 | } while (0); | |
5877 | } | |
bd99dc85 PA |
5878 | |
5879 | if (target_is_async_p ()) | |
5880 | async_file_mark (); /* trigger a linux_wait */ | |
5881 | ||
5882 | errno = old_errno; | |
5883 | } | |
5884 | ||
5885 | static int | |
5886 | linux_supports_non_stop (void) | |
5887 | { | |
5888 | return 1; | |
5889 | } | |
5890 | ||
5891 | static int | |
5892 | linux_async (int enable) | |
5893 | { | |
7089dca4 | 5894 | int previous = target_is_async_p (); |
bd99dc85 | 5895 | |
8336d594 | 5896 | if (debug_threads) |
87ce2a04 DE |
5897 | debug_printf ("linux_async (%d), previous=%d\n", |
5898 | enable, previous); | |
8336d594 | 5899 | |
bd99dc85 PA |
5900 | if (previous != enable) |
5901 | { | |
5902 | sigset_t mask; | |
5903 | sigemptyset (&mask); | |
5904 | sigaddset (&mask, SIGCHLD); | |
5905 | ||
5906 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
5907 | ||
5908 | if (enable) | |
5909 | { | |
5910 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
5911 | { |
5912 | linux_event_pipe[0] = -1; | |
5913 | linux_event_pipe[1] = -1; | |
5914 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5915 | ||
5916 | warning ("creating event pipe failed."); | |
5917 | return previous; | |
5918 | } | |
bd99dc85 PA |
5919 | |
5920 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5921 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5922 | ||
5923 | /* Register the event loop handler. */ | |
5924 | add_file_handler (linux_event_pipe[0], | |
5925 | handle_target_event, NULL); | |
5926 | ||
5927 | /* Always trigger a linux_wait. */ | |
5928 | async_file_mark (); | |
5929 | } | |
5930 | else | |
5931 | { | |
5932 | delete_file_handler (linux_event_pipe[0]); | |
5933 | ||
5934 | close (linux_event_pipe[0]); | |
5935 | close (linux_event_pipe[1]); | |
5936 | linux_event_pipe[0] = -1; | |
5937 | linux_event_pipe[1] = -1; | |
5938 | } | |
5939 | ||
5940 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5941 | } | |
5942 | ||
5943 | return previous; | |
5944 | } | |
5945 | ||
5946 | static int | |
5947 | linux_start_non_stop (int nonstop) | |
5948 | { | |
5949 | /* Register or unregister from event-loop accordingly. */ | |
5950 | linux_async (nonstop); | |
aa96c426 GB |
5951 | |
5952 | if (target_is_async_p () != (nonstop != 0)) | |
5953 | return -1; | |
5954 | ||
bd99dc85 PA |
5955 | return 0; |
5956 | } | |
5957 | ||
cf8fd78b PA |
5958 | static int |
5959 | linux_supports_multi_process (void) | |
5960 | { | |
5961 | return 1; | |
5962 | } | |
5963 | ||
89245bc0 DB |
5964 | /* Check if fork events are supported. */ |
5965 | ||
5966 | static int | |
5967 | linux_supports_fork_events (void) | |
5968 | { | |
5969 | return linux_supports_tracefork (); | |
5970 | } | |
5971 | ||
5972 | /* Check if vfork events are supported. */ | |
5973 | ||
5974 | static int | |
5975 | linux_supports_vfork_events (void) | |
5976 | { | |
5977 | return linux_supports_tracefork (); | |
5978 | } | |
5979 | ||
94585166 DB |
5980 | /* Check if exec events are supported. */ |
5981 | ||
5982 | static int | |
5983 | linux_supports_exec_events (void) | |
5984 | { | |
5985 | return linux_supports_traceexec (); | |
5986 | } | |
5987 | ||
de0d863e DB |
5988 | /* Callback for 'find_inferior'. Set the (possibly changed) ptrace |
5989 | options for the specified lwp. */ | |
5990 | ||
5991 | static int | |
5992 | reset_lwp_ptrace_options_callback (struct inferior_list_entry *entry, | |
5993 | void *args) | |
5994 | { | |
5995 | struct thread_info *thread = (struct thread_info *) entry; | |
5996 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5997 | ||
5998 | if (!lwp->stopped) | |
5999 | { | |
6000 | /* Stop the lwp so we can modify its ptrace options. */ | |
6001 | lwp->must_set_ptrace_flags = 1; | |
6002 | linux_stop_lwp (lwp); | |
6003 | } | |
6004 | else | |
6005 | { | |
6006 | /* Already stopped; go ahead and set the ptrace options. */ | |
6007 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
6008 | int options = linux_low_ptrace_options (proc->attached); | |
6009 | ||
6010 | linux_enable_event_reporting (lwpid_of (thread), options); | |
6011 | lwp->must_set_ptrace_flags = 0; | |
6012 | } | |
6013 | ||
6014 | return 0; | |
6015 | } | |
6016 | ||
6017 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the | |
6018 | ptrace flags for all inferiors. This is in case the new GDB connection | |
6019 | doesn't support the same set of events that the previous one did. */ | |
6020 | ||
6021 | static void | |
6022 | linux_handle_new_gdb_connection (void) | |
6023 | { | |
6024 | pid_t pid; | |
6025 | ||
6026 | /* Request that all the lwps reset their ptrace options. */ | |
6027 | find_inferior (&all_threads, reset_lwp_ptrace_options_callback , &pid); | |
6028 | } | |
6029 | ||
03583c20 UW |
6030 | static int |
6031 | linux_supports_disable_randomization (void) | |
6032 | { | |
6033 | #ifdef HAVE_PERSONALITY | |
6034 | return 1; | |
6035 | #else | |
6036 | return 0; | |
6037 | #endif | |
6038 | } | |
efcbbd14 | 6039 | |
d1feda86 YQ |
6040 | static int |
6041 | linux_supports_agent (void) | |
6042 | { | |
6043 | return 1; | |
6044 | } | |
6045 | ||
c2d6af84 PA |
6046 | static int |
6047 | linux_supports_range_stepping (void) | |
6048 | { | |
6049 | if (*the_low_target.supports_range_stepping == NULL) | |
6050 | return 0; | |
6051 | ||
6052 | return (*the_low_target.supports_range_stepping) (); | |
6053 | } | |
6054 | ||
efcbbd14 UW |
6055 | /* Enumerate spufs IDs for process PID. */ |
6056 | static int | |
6057 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
6058 | { | |
6059 | int pos = 0; | |
6060 | int written = 0; | |
6061 | char path[128]; | |
6062 | DIR *dir; | |
6063 | struct dirent *entry; | |
6064 | ||
6065 | sprintf (path, "/proc/%ld/fd", pid); | |
6066 | dir = opendir (path); | |
6067 | if (!dir) | |
6068 | return -1; | |
6069 | ||
6070 | rewinddir (dir); | |
6071 | while ((entry = readdir (dir)) != NULL) | |
6072 | { | |
6073 | struct stat st; | |
6074 | struct statfs stfs; | |
6075 | int fd; | |
6076 | ||
6077 | fd = atoi (entry->d_name); | |
6078 | if (!fd) | |
6079 | continue; | |
6080 | ||
6081 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
6082 | if (stat (path, &st) != 0) | |
6083 | continue; | |
6084 | if (!S_ISDIR (st.st_mode)) | |
6085 | continue; | |
6086 | ||
6087 | if (statfs (path, &stfs) != 0) | |
6088 | continue; | |
6089 | if (stfs.f_type != SPUFS_MAGIC) | |
6090 | continue; | |
6091 | ||
6092 | if (pos >= offset && pos + 4 <= offset + len) | |
6093 | { | |
6094 | *(unsigned int *)(buf + pos - offset) = fd; | |
6095 | written += 4; | |
6096 | } | |
6097 | pos += 4; | |
6098 | } | |
6099 | ||
6100 | closedir (dir); | |
6101 | return written; | |
6102 | } | |
6103 | ||
6104 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
6105 | object type, using the /proc file system. */ | |
6106 | static int | |
6107 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
6108 | unsigned const char *writebuf, | |
6109 | CORE_ADDR offset, int len) | |
6110 | { | |
0bfdf32f | 6111 | long pid = lwpid_of (current_thread); |
efcbbd14 UW |
6112 | char buf[128]; |
6113 | int fd = 0; | |
6114 | int ret = 0; | |
6115 | ||
6116 | if (!writebuf && !readbuf) | |
6117 | return -1; | |
6118 | ||
6119 | if (!*annex) | |
6120 | { | |
6121 | if (!readbuf) | |
6122 | return -1; | |
6123 | else | |
6124 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
6125 | } | |
6126 | ||
6127 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
6128 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
6129 | if (fd <= 0) | |
6130 | return -1; | |
6131 | ||
6132 | if (offset != 0 | |
6133 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
6134 | { | |
6135 | close (fd); | |
6136 | return 0; | |
6137 | } | |
6138 | ||
6139 | if (writebuf) | |
6140 | ret = write (fd, writebuf, (size_t) len); | |
6141 | else | |
6142 | ret = read (fd, readbuf, (size_t) len); | |
6143 | ||
6144 | close (fd); | |
6145 | return ret; | |
6146 | } | |
6147 | ||
723b724b | 6148 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
6149 | struct target_loadseg |
6150 | { | |
6151 | /* Core address to which the segment is mapped. */ | |
6152 | Elf32_Addr addr; | |
6153 | /* VMA recorded in the program header. */ | |
6154 | Elf32_Addr p_vaddr; | |
6155 | /* Size of this segment in memory. */ | |
6156 | Elf32_Word p_memsz; | |
6157 | }; | |
6158 | ||
723b724b | 6159 | # if defined PT_GETDSBT |
78d85199 YQ |
6160 | struct target_loadmap |
6161 | { | |
6162 | /* Protocol version number, must be zero. */ | |
6163 | Elf32_Word version; | |
6164 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
6165 | unsigned *dsbt_table; | |
6166 | unsigned dsbt_size, dsbt_index; | |
6167 | /* Number of segments in this map. */ | |
6168 | Elf32_Word nsegs; | |
6169 | /* The actual memory map. */ | |
6170 | struct target_loadseg segs[/*nsegs*/]; | |
6171 | }; | |
723b724b MF |
6172 | # define LINUX_LOADMAP PT_GETDSBT |
6173 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
6174 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
6175 | # else | |
6176 | struct target_loadmap | |
6177 | { | |
6178 | /* Protocol version number, must be zero. */ | |
6179 | Elf32_Half version; | |
6180 | /* Number of segments in this map. */ | |
6181 | Elf32_Half nsegs; | |
6182 | /* The actual memory map. */ | |
6183 | struct target_loadseg segs[/*nsegs*/]; | |
6184 | }; | |
6185 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
6186 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
6187 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
6188 | # endif | |
78d85199 | 6189 | |
78d85199 YQ |
6190 | static int |
6191 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
6192 | unsigned char *myaddr, unsigned int len) | |
6193 | { | |
0bfdf32f | 6194 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
6195 | int addr = -1; |
6196 | struct target_loadmap *data = NULL; | |
6197 | unsigned int actual_length, copy_length; | |
6198 | ||
6199 | if (strcmp (annex, "exec") == 0) | |
723b724b | 6200 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 6201 | else if (strcmp (annex, "interp") == 0) |
723b724b | 6202 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
6203 | else |
6204 | return -1; | |
6205 | ||
723b724b | 6206 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
6207 | return -1; |
6208 | ||
6209 | if (data == NULL) | |
6210 | return -1; | |
6211 | ||
6212 | actual_length = sizeof (struct target_loadmap) | |
6213 | + sizeof (struct target_loadseg) * data->nsegs; | |
6214 | ||
6215 | if (offset < 0 || offset > actual_length) | |
6216 | return -1; | |
6217 | ||
6218 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
6219 | memcpy (myaddr, (char *) data + offset, copy_length); | |
6220 | return copy_length; | |
6221 | } | |
723b724b MF |
6222 | #else |
6223 | # define linux_read_loadmap NULL | |
6224 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 6225 | |
1570b33e | 6226 | static void |
06e03fff | 6227 | linux_process_qsupported (char **features, int count) |
1570b33e L |
6228 | { |
6229 | if (the_low_target.process_qsupported != NULL) | |
06e03fff | 6230 | the_low_target.process_qsupported (features, count); |
1570b33e L |
6231 | } |
6232 | ||
219f2f23 PA |
6233 | static int |
6234 | linux_supports_tracepoints (void) | |
6235 | { | |
6236 | if (*the_low_target.supports_tracepoints == NULL) | |
6237 | return 0; | |
6238 | ||
6239 | return (*the_low_target.supports_tracepoints) (); | |
6240 | } | |
6241 | ||
6242 | static CORE_ADDR | |
6243 | linux_read_pc (struct regcache *regcache) | |
6244 | { | |
6245 | if (the_low_target.get_pc == NULL) | |
6246 | return 0; | |
6247 | ||
6248 | return (*the_low_target.get_pc) (regcache); | |
6249 | } | |
6250 | ||
6251 | static void | |
6252 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
6253 | { | |
6254 | gdb_assert (the_low_target.set_pc != NULL); | |
6255 | ||
6256 | (*the_low_target.set_pc) (regcache, pc); | |
6257 | } | |
6258 | ||
8336d594 PA |
6259 | static int |
6260 | linux_thread_stopped (struct thread_info *thread) | |
6261 | { | |
6262 | return get_thread_lwp (thread)->stopped; | |
6263 | } | |
6264 | ||
6265 | /* This exposes stop-all-threads functionality to other modules. */ | |
6266 | ||
6267 | static void | |
7984d532 | 6268 | linux_pause_all (int freeze) |
8336d594 | 6269 | { |
7984d532 PA |
6270 | stop_all_lwps (freeze, NULL); |
6271 | } | |
6272 | ||
6273 | /* This exposes unstop-all-threads functionality to other gdbserver | |
6274 | modules. */ | |
6275 | ||
6276 | static void | |
6277 | linux_unpause_all (int unfreeze) | |
6278 | { | |
6279 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
6280 | } |
6281 | ||
90d74c30 PA |
6282 | static int |
6283 | linux_prepare_to_access_memory (void) | |
6284 | { | |
6285 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6286 | running LWP. */ | |
6287 | if (non_stop) | |
6288 | linux_pause_all (1); | |
6289 | return 0; | |
6290 | } | |
6291 | ||
6292 | static void | |
0146f85b | 6293 | linux_done_accessing_memory (void) |
90d74c30 PA |
6294 | { |
6295 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6296 | running LWP. */ | |
6297 | if (non_stop) | |
6298 | linux_unpause_all (1); | |
6299 | } | |
6300 | ||
fa593d66 PA |
6301 | static int |
6302 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
6303 | CORE_ADDR collector, | |
6304 | CORE_ADDR lockaddr, | |
6305 | ULONGEST orig_size, | |
6306 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
6307 | CORE_ADDR *trampoline, |
6308 | ULONGEST *trampoline_size, | |
fa593d66 PA |
6309 | unsigned char *jjump_pad_insn, |
6310 | ULONGEST *jjump_pad_insn_size, | |
6311 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
6312 | CORE_ADDR *adjusted_insn_addr_end, |
6313 | char *err) | |
fa593d66 PA |
6314 | { |
6315 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
6316 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
6317 | jump_entry, trampoline, trampoline_size, |
6318 | jjump_pad_insn, jjump_pad_insn_size, | |
6319 | adjusted_insn_addr, adjusted_insn_addr_end, | |
6320 | err); | |
fa593d66 PA |
6321 | } |
6322 | ||
6a271cae PA |
6323 | static struct emit_ops * |
6324 | linux_emit_ops (void) | |
6325 | { | |
6326 | if (the_low_target.emit_ops != NULL) | |
6327 | return (*the_low_target.emit_ops) (); | |
6328 | else | |
6329 | return NULL; | |
6330 | } | |
6331 | ||
405f8e94 SS |
6332 | static int |
6333 | linux_get_min_fast_tracepoint_insn_len (void) | |
6334 | { | |
6335 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
6336 | } | |
6337 | ||
2268b414 JK |
6338 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
6339 | ||
6340 | static int | |
6341 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
6342 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
6343 | { | |
6344 | char filename[PATH_MAX]; | |
6345 | int fd; | |
6346 | const int auxv_size = is_elf64 | |
6347 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
6348 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
6349 | ||
6350 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
6351 | ||
6352 | fd = open (filename, O_RDONLY); | |
6353 | if (fd < 0) | |
6354 | return 1; | |
6355 | ||
6356 | *phdr_memaddr = 0; | |
6357 | *num_phdr = 0; | |
6358 | while (read (fd, buf, auxv_size) == auxv_size | |
6359 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6360 | { | |
6361 | if (is_elf64) | |
6362 | { | |
6363 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6364 | ||
6365 | switch (aux->a_type) | |
6366 | { | |
6367 | case AT_PHDR: | |
6368 | *phdr_memaddr = aux->a_un.a_val; | |
6369 | break; | |
6370 | case AT_PHNUM: | |
6371 | *num_phdr = aux->a_un.a_val; | |
6372 | break; | |
6373 | } | |
6374 | } | |
6375 | else | |
6376 | { | |
6377 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6378 | ||
6379 | switch (aux->a_type) | |
6380 | { | |
6381 | case AT_PHDR: | |
6382 | *phdr_memaddr = aux->a_un.a_val; | |
6383 | break; | |
6384 | case AT_PHNUM: | |
6385 | *num_phdr = aux->a_un.a_val; | |
6386 | break; | |
6387 | } | |
6388 | } | |
6389 | } | |
6390 | ||
6391 | close (fd); | |
6392 | ||
6393 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6394 | { | |
6395 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6396 | "phdr_memaddr = %ld, phdr_num = %d", | |
6397 | (long) *phdr_memaddr, *num_phdr); | |
6398 | return 2; | |
6399 | } | |
6400 | ||
6401 | return 0; | |
6402 | } | |
6403 | ||
6404 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6405 | ||
6406 | static CORE_ADDR | |
6407 | get_dynamic (const int pid, const int is_elf64) | |
6408 | { | |
6409 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6410 | int num_phdr, i; |
2268b414 | 6411 | unsigned char *phdr_buf; |
db1ff28b | 6412 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6413 | |
6414 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6415 | return 0; | |
6416 | ||
6417 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
224c3ddb | 6418 | phdr_buf = (unsigned char *) alloca (num_phdr * phdr_size); |
2268b414 JK |
6419 | |
6420 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6421 | return 0; | |
6422 | ||
6423 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6424 | non-zero for PIE ones. */ | |
6425 | relocation = -1; | |
db1ff28b JK |
6426 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6427 | if (is_elf64) | |
6428 | { | |
6429 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6430 | ||
6431 | if (p->p_type == PT_PHDR) | |
6432 | relocation = phdr_memaddr - p->p_vaddr; | |
6433 | } | |
6434 | else | |
6435 | { | |
6436 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6437 | ||
6438 | if (p->p_type == PT_PHDR) | |
6439 | relocation = phdr_memaddr - p->p_vaddr; | |
6440 | } | |
6441 | ||
2268b414 JK |
6442 | if (relocation == -1) |
6443 | { | |
e237a7e2 JK |
6444 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6445 | any real world executables, including PIE executables, have always | |
6446 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6447 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6448 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6449 | ||
6450 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6451 | ||
6452 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6453 | ||
2268b414 JK |
6454 | return 0; |
6455 | } | |
6456 | ||
db1ff28b JK |
6457 | for (i = 0; i < num_phdr; i++) |
6458 | { | |
6459 | if (is_elf64) | |
6460 | { | |
6461 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6462 | ||
6463 | if (p->p_type == PT_DYNAMIC) | |
6464 | return p->p_vaddr + relocation; | |
6465 | } | |
6466 | else | |
6467 | { | |
6468 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6469 | |
db1ff28b JK |
6470 | if (p->p_type == PT_DYNAMIC) |
6471 | return p->p_vaddr + relocation; | |
6472 | } | |
6473 | } | |
2268b414 JK |
6474 | |
6475 | return 0; | |
6476 | } | |
6477 | ||
6478 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6479 | can be 0 if the inferior does not yet have the library list initialized. |
6480 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6481 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6482 | |
6483 | static CORE_ADDR | |
6484 | get_r_debug (const int pid, const int is_elf64) | |
6485 | { | |
6486 | CORE_ADDR dynamic_memaddr; | |
6487 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6488 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6489 | CORE_ADDR map = -1; |
2268b414 JK |
6490 | |
6491 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6492 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6493 | return map; |
2268b414 JK |
6494 | |
6495 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6496 | { | |
6497 | if (is_elf64) | |
6498 | { | |
6499 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
a738da3a | 6500 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6501 | union |
6502 | { | |
6503 | Elf64_Xword map; | |
6504 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6505 | } | |
6506 | rld_map; | |
a738da3a MF |
6507 | #endif |
6508 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6509 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6510 | { | |
6511 | if (linux_read_memory (dyn->d_un.d_val, | |
6512 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6513 | return rld_map.map; | |
6514 | else | |
6515 | break; | |
6516 | } | |
75f62ce7 | 6517 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6518 | #ifdef DT_MIPS_RLD_MAP_REL |
6519 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6520 | { | |
6521 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6522 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6523 | return rld_map.map; | |
6524 | else | |
6525 | break; | |
6526 | } | |
6527 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6528 | |
367ba2c2 MR |
6529 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6530 | map = dyn->d_un.d_val; | |
2268b414 JK |
6531 | |
6532 | if (dyn->d_tag == DT_NULL) | |
6533 | break; | |
6534 | } | |
6535 | else | |
6536 | { | |
6537 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
a738da3a | 6538 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6539 | union |
6540 | { | |
6541 | Elf32_Word map; | |
6542 | unsigned char buf[sizeof (Elf32_Word)]; | |
6543 | } | |
6544 | rld_map; | |
a738da3a MF |
6545 | #endif |
6546 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6547 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6548 | { | |
6549 | if (linux_read_memory (dyn->d_un.d_val, | |
6550 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6551 | return rld_map.map; | |
6552 | else | |
6553 | break; | |
6554 | } | |
75f62ce7 | 6555 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6556 | #ifdef DT_MIPS_RLD_MAP_REL |
6557 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6558 | { | |
6559 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6560 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6561 | return rld_map.map; | |
6562 | else | |
6563 | break; | |
6564 | } | |
6565 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6566 | |
367ba2c2 MR |
6567 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6568 | map = dyn->d_un.d_val; | |
2268b414 JK |
6569 | |
6570 | if (dyn->d_tag == DT_NULL) | |
6571 | break; | |
6572 | } | |
6573 | ||
6574 | dynamic_memaddr += dyn_size; | |
6575 | } | |
6576 | ||
367ba2c2 | 6577 | return map; |
2268b414 JK |
6578 | } |
6579 | ||
6580 | /* Read one pointer from MEMADDR in the inferior. */ | |
6581 | ||
6582 | static int | |
6583 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
6584 | { | |
485f1ee4 PA |
6585 | int ret; |
6586 | ||
6587 | /* Go through a union so this works on either big or little endian | |
6588 | hosts, when the inferior's pointer size is smaller than the size | |
6589 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
6590 | same of the superior's. */ | |
6591 | union | |
6592 | { | |
6593 | CORE_ADDR core_addr; | |
6594 | unsigned int ui; | |
6595 | unsigned char uc; | |
6596 | } addr; | |
6597 | ||
6598 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
6599 | if (ret == 0) | |
6600 | { | |
6601 | if (ptr_size == sizeof (CORE_ADDR)) | |
6602 | *ptr = addr.core_addr; | |
6603 | else if (ptr_size == sizeof (unsigned int)) | |
6604 | *ptr = addr.ui; | |
6605 | else | |
6606 | gdb_assert_not_reached ("unhandled pointer size"); | |
6607 | } | |
6608 | return ret; | |
2268b414 JK |
6609 | } |
6610 | ||
6611 | struct link_map_offsets | |
6612 | { | |
6613 | /* Offset and size of r_debug.r_version. */ | |
6614 | int r_version_offset; | |
6615 | ||
6616 | /* Offset and size of r_debug.r_map. */ | |
6617 | int r_map_offset; | |
6618 | ||
6619 | /* Offset to l_addr field in struct link_map. */ | |
6620 | int l_addr_offset; | |
6621 | ||
6622 | /* Offset to l_name field in struct link_map. */ | |
6623 | int l_name_offset; | |
6624 | ||
6625 | /* Offset to l_ld field in struct link_map. */ | |
6626 | int l_ld_offset; | |
6627 | ||
6628 | /* Offset to l_next field in struct link_map. */ | |
6629 | int l_next_offset; | |
6630 | ||
6631 | /* Offset to l_prev field in struct link_map. */ | |
6632 | int l_prev_offset; | |
6633 | }; | |
6634 | ||
fb723180 | 6635 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
6636 | |
6637 | static int | |
6638 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
6639 | unsigned const char *writebuf, | |
6640 | CORE_ADDR offset, int len) | |
6641 | { | |
6642 | char *document; | |
6643 | unsigned document_len; | |
fe978cb0 | 6644 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
6645 | char filename[PATH_MAX]; |
6646 | int pid, is_elf64; | |
6647 | ||
6648 | static const struct link_map_offsets lmo_32bit_offsets = | |
6649 | { | |
6650 | 0, /* r_version offset. */ | |
6651 | 4, /* r_debug.r_map offset. */ | |
6652 | 0, /* l_addr offset in link_map. */ | |
6653 | 4, /* l_name offset in link_map. */ | |
6654 | 8, /* l_ld offset in link_map. */ | |
6655 | 12, /* l_next offset in link_map. */ | |
6656 | 16 /* l_prev offset in link_map. */ | |
6657 | }; | |
6658 | ||
6659 | static const struct link_map_offsets lmo_64bit_offsets = | |
6660 | { | |
6661 | 0, /* r_version offset. */ | |
6662 | 8, /* r_debug.r_map offset. */ | |
6663 | 0, /* l_addr offset in link_map. */ | |
6664 | 8, /* l_name offset in link_map. */ | |
6665 | 16, /* l_ld offset in link_map. */ | |
6666 | 24, /* l_next offset in link_map. */ | |
6667 | 32 /* l_prev offset in link_map. */ | |
6668 | }; | |
6669 | const struct link_map_offsets *lmo; | |
214d508e | 6670 | unsigned int machine; |
b1fbec62 GB |
6671 | int ptr_size; |
6672 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
6673 | int allocated = 1024; | |
6674 | char *p; | |
6675 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
6676 | int header_done = 0; | |
2268b414 JK |
6677 | |
6678 | if (writebuf != NULL) | |
6679 | return -2; | |
6680 | if (readbuf == NULL) | |
6681 | return -1; | |
6682 | ||
0bfdf32f | 6683 | pid = lwpid_of (current_thread); |
2268b414 | 6684 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 6685 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 6686 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 6687 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 6688 | |
b1fbec62 GB |
6689 | while (annex[0] != '\0') |
6690 | { | |
6691 | const char *sep; | |
6692 | CORE_ADDR *addrp; | |
6693 | int len; | |
2268b414 | 6694 | |
b1fbec62 GB |
6695 | sep = strchr (annex, '='); |
6696 | if (sep == NULL) | |
6697 | break; | |
0c5bf5a9 | 6698 | |
b1fbec62 | 6699 | len = sep - annex; |
61012eef | 6700 | if (len == 5 && startswith (annex, "start")) |
b1fbec62 | 6701 | addrp = &lm_addr; |
61012eef | 6702 | else if (len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
6703 | addrp = &lm_prev; |
6704 | else | |
6705 | { | |
6706 | annex = strchr (sep, ';'); | |
6707 | if (annex == NULL) | |
6708 | break; | |
6709 | annex++; | |
6710 | continue; | |
6711 | } | |
6712 | ||
6713 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 6714 | } |
b1fbec62 GB |
6715 | |
6716 | if (lm_addr == 0) | |
2268b414 | 6717 | { |
b1fbec62 GB |
6718 | int r_version = 0; |
6719 | ||
6720 | if (priv->r_debug == 0) | |
6721 | priv->r_debug = get_r_debug (pid, is_elf64); | |
6722 | ||
6723 | /* We failed to find DT_DEBUG. Such situation will not change | |
6724 | for this inferior - do not retry it. Report it to GDB as | |
6725 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
6726 | if (priv->r_debug == (CORE_ADDR) -1) | |
6727 | return -1; | |
6728 | ||
6729 | if (priv->r_debug != 0) | |
2268b414 | 6730 | { |
b1fbec62 GB |
6731 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
6732 | (unsigned char *) &r_version, | |
6733 | sizeof (r_version)) != 0 | |
6734 | || r_version != 1) | |
6735 | { | |
6736 | warning ("unexpected r_debug version %d", r_version); | |
6737 | } | |
6738 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
6739 | &lm_addr, ptr_size) != 0) | |
6740 | { | |
6741 | warning ("unable to read r_map from 0x%lx", | |
6742 | (long) priv->r_debug + lmo->r_map_offset); | |
6743 | } | |
2268b414 | 6744 | } |
b1fbec62 | 6745 | } |
2268b414 | 6746 | |
224c3ddb | 6747 | document = (char *) xmalloc (allocated); |
b1fbec62 GB |
6748 | strcpy (document, "<library-list-svr4 version=\"1.0\""); |
6749 | p = document + strlen (document); | |
6750 | ||
6751 | while (lm_addr | |
6752 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
6753 | &l_name, ptr_size) == 0 | |
6754 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
6755 | &l_addr, ptr_size) == 0 | |
6756 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
6757 | &l_ld, ptr_size) == 0 | |
6758 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
6759 | &l_prev, ptr_size) == 0 | |
6760 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
6761 | &l_next, ptr_size) == 0) | |
6762 | { | |
6763 | unsigned char libname[PATH_MAX]; | |
6764 | ||
6765 | if (lm_prev != l_prev) | |
2268b414 | 6766 | { |
b1fbec62 GB |
6767 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
6768 | (long) lm_prev, (long) l_prev); | |
6769 | break; | |
2268b414 JK |
6770 | } |
6771 | ||
d878444c JK |
6772 | /* Ignore the first entry even if it has valid name as the first entry |
6773 | corresponds to the main executable. The first entry should not be | |
6774 | skipped if the dynamic loader was loaded late by a static executable | |
6775 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
6776 | executable does not have PT_DYNAMIC present and this function already | |
6777 | exited above due to failed get_r_debug. */ | |
6778 | if (lm_prev == 0) | |
2268b414 | 6779 | { |
d878444c JK |
6780 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
6781 | p = p + strlen (p); | |
6782 | } | |
6783 | else | |
6784 | { | |
6785 | /* Not checking for error because reading may stop before | |
6786 | we've got PATH_MAX worth of characters. */ | |
6787 | libname[0] = '\0'; | |
6788 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
6789 | libname[sizeof (libname) - 1] = '\0'; | |
6790 | if (libname[0] != '\0') | |
2268b414 | 6791 | { |
d878444c JK |
6792 | /* 6x the size for xml_escape_text below. */ |
6793 | size_t len = 6 * strlen ((char *) libname); | |
6794 | char *name; | |
2268b414 | 6795 | |
d878444c JK |
6796 | if (!header_done) |
6797 | { | |
6798 | /* Terminate `<library-list-svr4'. */ | |
6799 | *p++ = '>'; | |
6800 | header_done = 1; | |
6801 | } | |
2268b414 | 6802 | |
db1ff28b | 6803 | while (allocated < p - document + len + 200) |
d878444c JK |
6804 | { |
6805 | /* Expand to guarantee sufficient storage. */ | |
6806 | uintptr_t document_len = p - document; | |
2268b414 | 6807 | |
224c3ddb | 6808 | document = (char *) xrealloc (document, 2 * allocated); |
d878444c JK |
6809 | allocated *= 2; |
6810 | p = document + document_len; | |
6811 | } | |
6812 | ||
6813 | name = xml_escape_text ((char *) libname); | |
6814 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
db1ff28b | 6815 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", |
d878444c JK |
6816 | name, (unsigned long) lm_addr, |
6817 | (unsigned long) l_addr, (unsigned long) l_ld); | |
6818 | free (name); | |
6819 | } | |
0afae3cf | 6820 | } |
b1fbec62 GB |
6821 | |
6822 | lm_prev = lm_addr; | |
6823 | lm_addr = l_next; | |
2268b414 JK |
6824 | } |
6825 | ||
b1fbec62 GB |
6826 | if (!header_done) |
6827 | { | |
6828 | /* Empty list; terminate `<library-list-svr4'. */ | |
6829 | strcpy (p, "/>"); | |
6830 | } | |
6831 | else | |
6832 | strcpy (p, "</library-list-svr4>"); | |
6833 | ||
2268b414 JK |
6834 | document_len = strlen (document); |
6835 | if (offset < document_len) | |
6836 | document_len -= offset; | |
6837 | else | |
6838 | document_len = 0; | |
6839 | if (len > document_len) | |
6840 | len = document_len; | |
6841 | ||
6842 | memcpy (readbuf, document + offset, len); | |
6843 | xfree (document); | |
6844 | ||
6845 | return len; | |
6846 | } | |
6847 | ||
9accd112 MM |
6848 | #ifdef HAVE_LINUX_BTRACE |
6849 | ||
969c39fb | 6850 | /* See to_disable_btrace target method. */ |
9accd112 | 6851 | |
969c39fb MM |
6852 | static int |
6853 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
6854 | { | |
6855 | enum btrace_error err; | |
6856 | ||
6857 | err = linux_disable_btrace (tinfo); | |
6858 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
6859 | } | |
6860 | ||
b20a6524 MM |
6861 | /* Encode an Intel(R) Processor Trace configuration. */ |
6862 | ||
6863 | static void | |
6864 | linux_low_encode_pt_config (struct buffer *buffer, | |
6865 | const struct btrace_data_pt_config *config) | |
6866 | { | |
6867 | buffer_grow_str (buffer, "<pt-config>\n"); | |
6868 | ||
6869 | switch (config->cpu.vendor) | |
6870 | { | |
6871 | case CV_INTEL: | |
6872 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
6873 | "model=\"%u\" stepping=\"%u\"/>\n", | |
6874 | config->cpu.family, config->cpu.model, | |
6875 | config->cpu.stepping); | |
6876 | break; | |
6877 | ||
6878 | default: | |
6879 | break; | |
6880 | } | |
6881 | ||
6882 | buffer_grow_str (buffer, "</pt-config>\n"); | |
6883 | } | |
6884 | ||
6885 | /* Encode a raw buffer. */ | |
6886 | ||
6887 | static void | |
6888 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
6889 | unsigned int size) | |
6890 | { | |
6891 | if (size == 0) | |
6892 | return; | |
6893 | ||
6894 | /* We use hex encoding - see common/rsp-low.h. */ | |
6895 | buffer_grow_str (buffer, "<raw>\n"); | |
6896 | ||
6897 | while (size-- > 0) | |
6898 | { | |
6899 | char elem[2]; | |
6900 | ||
6901 | elem[0] = tohex ((*data >> 4) & 0xf); | |
6902 | elem[1] = tohex (*data++ & 0xf); | |
6903 | ||
6904 | buffer_grow (buffer, elem, 2); | |
6905 | } | |
6906 | ||
6907 | buffer_grow_str (buffer, "</raw>\n"); | |
6908 | } | |
6909 | ||
969c39fb MM |
6910 | /* See to_read_btrace target method. */ |
6911 | ||
6912 | static int | |
9accd112 | 6913 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
add67df8 | 6914 | enum btrace_read_type type) |
9accd112 | 6915 | { |
734b0e4b | 6916 | struct btrace_data btrace; |
9accd112 | 6917 | struct btrace_block *block; |
969c39fb | 6918 | enum btrace_error err; |
9accd112 MM |
6919 | int i; |
6920 | ||
734b0e4b MM |
6921 | btrace_data_init (&btrace); |
6922 | ||
969c39fb MM |
6923 | err = linux_read_btrace (&btrace, tinfo, type); |
6924 | if (err != BTRACE_ERR_NONE) | |
6925 | { | |
6926 | if (err == BTRACE_ERR_OVERFLOW) | |
6927 | buffer_grow_str0 (buffer, "E.Overflow."); | |
6928 | else | |
6929 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
6930 | ||
b20a6524 | 6931 | goto err; |
969c39fb | 6932 | } |
9accd112 | 6933 | |
734b0e4b MM |
6934 | switch (btrace.format) |
6935 | { | |
6936 | case BTRACE_FORMAT_NONE: | |
6937 | buffer_grow_str0 (buffer, "E.No Trace."); | |
b20a6524 | 6938 | goto err; |
734b0e4b MM |
6939 | |
6940 | case BTRACE_FORMAT_BTS: | |
6941 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6942 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 6943 | |
734b0e4b MM |
6944 | for (i = 0; |
6945 | VEC_iterate (btrace_block_s, btrace.variant.bts.blocks, i, block); | |
6946 | i++) | |
6947 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
6948 | paddress (block->begin), paddress (block->end)); | |
9accd112 | 6949 | |
734b0e4b MM |
6950 | buffer_grow_str0 (buffer, "</btrace>\n"); |
6951 | break; | |
6952 | ||
b20a6524 MM |
6953 | case BTRACE_FORMAT_PT: |
6954 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6955 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
6956 | buffer_grow_str (buffer, "<pt>\n"); | |
6957 | ||
6958 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 6959 | |
b20a6524 MM |
6960 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
6961 | btrace.variant.pt.size); | |
6962 | ||
6963 | buffer_grow_str (buffer, "</pt>\n"); | |
6964 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
6965 | break; | |
6966 | ||
6967 | default: | |
6968 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
6969 | goto err; | |
734b0e4b | 6970 | } |
969c39fb | 6971 | |
734b0e4b | 6972 | btrace_data_fini (&btrace); |
969c39fb | 6973 | return 0; |
b20a6524 MM |
6974 | |
6975 | err: | |
6976 | btrace_data_fini (&btrace); | |
6977 | return -1; | |
9accd112 | 6978 | } |
f4abbc16 MM |
6979 | |
6980 | /* See to_btrace_conf target method. */ | |
6981 | ||
6982 | static int | |
6983 | linux_low_btrace_conf (const struct btrace_target_info *tinfo, | |
6984 | struct buffer *buffer) | |
6985 | { | |
6986 | const struct btrace_config *conf; | |
6987 | ||
6988 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
6989 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
6990 | ||
6991 | conf = linux_btrace_conf (tinfo); | |
6992 | if (conf != NULL) | |
6993 | { | |
6994 | switch (conf->format) | |
6995 | { | |
6996 | case BTRACE_FORMAT_NONE: | |
6997 | break; | |
6998 | ||
6999 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
7000 | buffer_xml_printf (buffer, "<bts"); |
7001 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
7002 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 7003 | break; |
b20a6524 MM |
7004 | |
7005 | case BTRACE_FORMAT_PT: | |
7006 | buffer_xml_printf (buffer, "<pt"); | |
7007 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
7008 | buffer_xml_printf (buffer, "/>\n"); | |
7009 | break; | |
f4abbc16 MM |
7010 | } |
7011 | } | |
7012 | ||
7013 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
7014 | return 0; | |
7015 | } | |
9accd112 MM |
7016 | #endif /* HAVE_LINUX_BTRACE */ |
7017 | ||
7b669087 GB |
7018 | /* See nat/linux-nat.h. */ |
7019 | ||
7020 | ptid_t | |
7021 | current_lwp_ptid (void) | |
7022 | { | |
7023 | return ptid_of (current_thread); | |
7024 | } | |
7025 | ||
dd373349 AT |
7026 | /* Implementation of the target_ops method "breakpoint_kind_from_pc". */ |
7027 | ||
7028 | static int | |
7029 | linux_breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
7030 | { | |
7031 | if (the_low_target.breakpoint_kind_from_pc != NULL) | |
7032 | return (*the_low_target.breakpoint_kind_from_pc) (pcptr); | |
7033 | else | |
1652a986 | 7034 | return default_breakpoint_kind_from_pc (pcptr); |
dd373349 AT |
7035 | } |
7036 | ||
7037 | /* Implementation of the target_ops method "sw_breakpoint_from_kind". */ | |
7038 | ||
7039 | static const gdb_byte * | |
7040 | linux_sw_breakpoint_from_kind (int kind, int *size) | |
7041 | { | |
7042 | gdb_assert (the_low_target.sw_breakpoint_from_kind != NULL); | |
7043 | ||
7044 | return (*the_low_target.sw_breakpoint_from_kind) (kind, size); | |
7045 | } | |
7046 | ||
769ef81f AT |
7047 | /* Implementation of the target_ops method |
7048 | "breakpoint_kind_from_current_state". */ | |
7049 | ||
7050 | static int | |
7051 | linux_breakpoint_kind_from_current_state (CORE_ADDR *pcptr) | |
7052 | { | |
7053 | if (the_low_target.breakpoint_kind_from_current_state != NULL) | |
7054 | return (*the_low_target.breakpoint_kind_from_current_state) (pcptr); | |
7055 | else | |
7056 | return linux_breakpoint_kind_from_pc (pcptr); | |
7057 | } | |
7058 | ||
ce3a066d DJ |
7059 | static struct target_ops linux_target_ops = { |
7060 | linux_create_inferior, | |
c06cbd92 | 7061 | linux_arch_setup, |
ce3a066d DJ |
7062 | linux_attach, |
7063 | linux_kill, | |
6ad8ae5c | 7064 | linux_detach, |
8336d594 | 7065 | linux_mourn, |
444d6139 | 7066 | linux_join, |
ce3a066d DJ |
7067 | linux_thread_alive, |
7068 | linux_resume, | |
7069 | linux_wait, | |
7070 | linux_fetch_registers, | |
7071 | linux_store_registers, | |
90d74c30 | 7072 | linux_prepare_to_access_memory, |
0146f85b | 7073 | linux_done_accessing_memory, |
ce3a066d DJ |
7074 | linux_read_memory, |
7075 | linux_write_memory, | |
2f2893d9 | 7076 | linux_look_up_symbols, |
ef57601b | 7077 | linux_request_interrupt, |
aa691b87 | 7078 | linux_read_auxv, |
802e8e6d | 7079 | linux_supports_z_point_type, |
d993e290 PA |
7080 | linux_insert_point, |
7081 | linux_remove_point, | |
3e572f71 PA |
7082 | linux_stopped_by_sw_breakpoint, |
7083 | linux_supports_stopped_by_sw_breakpoint, | |
7084 | linux_stopped_by_hw_breakpoint, | |
7085 | linux_supports_stopped_by_hw_breakpoint, | |
70b90b91 | 7086 | linux_supports_hardware_single_step, |
e013ee27 OF |
7087 | linux_stopped_by_watchpoint, |
7088 | linux_stopped_data_address, | |
db0dfaa0 LM |
7089 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
7090 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
7091 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 7092 | linux_read_offsets, |
dae5f5cf DJ |
7093 | #else |
7094 | NULL, | |
7095 | #endif | |
7096 | #ifdef USE_THREAD_DB | |
7097 | thread_db_get_tls_address, | |
7098 | #else | |
7099 | NULL, | |
52fb6437 | 7100 | #endif |
efcbbd14 | 7101 | linux_qxfer_spu, |
59a016f0 | 7102 | hostio_last_error_from_errno, |
07e059b5 | 7103 | linux_qxfer_osdata, |
4aa995e1 | 7104 | linux_xfer_siginfo, |
bd99dc85 PA |
7105 | linux_supports_non_stop, |
7106 | linux_async, | |
7107 | linux_start_non_stop, | |
cdbfd419 | 7108 | linux_supports_multi_process, |
89245bc0 DB |
7109 | linux_supports_fork_events, |
7110 | linux_supports_vfork_events, | |
94585166 | 7111 | linux_supports_exec_events, |
de0d863e | 7112 | linux_handle_new_gdb_connection, |
cdbfd419 | 7113 | #ifdef USE_THREAD_DB |
dc146f7c | 7114 | thread_db_handle_monitor_command, |
cdbfd419 | 7115 | #else |
dc146f7c | 7116 | NULL, |
cdbfd419 | 7117 | #endif |
d26e3629 | 7118 | linux_common_core_of_thread, |
78d85199 | 7119 | linux_read_loadmap, |
219f2f23 PA |
7120 | linux_process_qsupported, |
7121 | linux_supports_tracepoints, | |
7122 | linux_read_pc, | |
8336d594 PA |
7123 | linux_write_pc, |
7124 | linux_thread_stopped, | |
7984d532 | 7125 | NULL, |
711e434b | 7126 | linux_pause_all, |
7984d532 | 7127 | linux_unpause_all, |
fa593d66 | 7128 | linux_stabilize_threads, |
6a271cae | 7129 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
7130 | linux_emit_ops, |
7131 | linux_supports_disable_randomization, | |
405f8e94 | 7132 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 7133 | linux_qxfer_libraries_svr4, |
d1feda86 | 7134 | linux_supports_agent, |
9accd112 MM |
7135 | #ifdef HAVE_LINUX_BTRACE |
7136 | linux_supports_btrace, | |
0568462b | 7137 | linux_enable_btrace, |
969c39fb | 7138 | linux_low_disable_btrace, |
9accd112 | 7139 | linux_low_read_btrace, |
f4abbc16 | 7140 | linux_low_btrace_conf, |
9accd112 MM |
7141 | #else |
7142 | NULL, | |
7143 | NULL, | |
7144 | NULL, | |
7145 | NULL, | |
f4abbc16 | 7146 | NULL, |
9accd112 | 7147 | #endif |
c2d6af84 | 7148 | linux_supports_range_stepping, |
e57f1de3 | 7149 | linux_proc_pid_to_exec_file, |
14d2069a GB |
7150 | linux_mntns_open_cloexec, |
7151 | linux_mntns_unlink, | |
7152 | linux_mntns_readlink, | |
dd373349 | 7153 | linux_breakpoint_kind_from_pc, |
79efa585 SM |
7154 | linux_sw_breakpoint_from_kind, |
7155 | linux_proc_tid_get_name, | |
769ef81f | 7156 | linux_breakpoint_kind_from_current_state |
ce3a066d DJ |
7157 | }; |
7158 | ||
0d62e5e8 DJ |
7159 | static void |
7160 | linux_init_signals () | |
7161 | { | |
7162 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
7163 | to find what the cancel signal actually is. */ | |
1a981360 | 7164 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 7165 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 7166 | #endif |
0d62e5e8 DJ |
7167 | } |
7168 | ||
3aee8918 PA |
7169 | #ifdef HAVE_LINUX_REGSETS |
7170 | void | |
7171 | initialize_regsets_info (struct regsets_info *info) | |
7172 | { | |
7173 | for (info->num_regsets = 0; | |
7174 | info->regsets[info->num_regsets].size >= 0; | |
7175 | info->num_regsets++) | |
7176 | ; | |
3aee8918 PA |
7177 | } |
7178 | #endif | |
7179 | ||
da6d8c04 DJ |
7180 | void |
7181 | initialize_low (void) | |
7182 | { | |
bd99dc85 | 7183 | struct sigaction sigchld_action; |
dd373349 | 7184 | |
bd99dc85 | 7185 | memset (&sigchld_action, 0, sizeof (sigchld_action)); |
ce3a066d | 7186 | set_target_ops (&linux_target_ops); |
dd373349 | 7187 | |
0d62e5e8 | 7188 | linux_init_signals (); |
aa7c7447 | 7189 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
7190 | |
7191 | sigchld_action.sa_handler = sigchld_handler; | |
7192 | sigemptyset (&sigchld_action.sa_mask); | |
7193 | sigchld_action.sa_flags = SA_RESTART; | |
7194 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
7195 | |
7196 | initialize_low_arch (); | |
89245bc0 DB |
7197 | |
7198 | linux_check_ptrace_features (); | |
da6d8c04 | 7199 | } |