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