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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
32d0add0 | 2 | Copyright (C) 1995-2015 Free Software Foundation, Inc. |
da6d8c04 DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
da6d8c04 DJ |
9 | (at your option) any later version. |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
da6d8c04 DJ |
18 | |
19 | #include "server.h" | |
58caa3dc | 20 | #include "linux-low.h" |
125f8a3d | 21 | #include "nat/linux-osdata.h" |
58b4daa5 | 22 | #include "agent.h" |
de0d863e | 23 | #include "tdesc.h" |
b20a6524 | 24 | #include "rsp-low.h" |
da6d8c04 | 25 | |
96d7229d LM |
26 | #include "nat/linux-nat.h" |
27 | #include "nat/linux-waitpid.h" | |
8bdce1ff | 28 | #include "gdb_wait.h" |
da6d8c04 | 29 | #include <sys/ptrace.h> |
125f8a3d GB |
30 | #include "nat/linux-ptrace.h" |
31 | #include "nat/linux-procfs.h" | |
8cc73a39 | 32 | #include "nat/linux-personality.h" |
da6d8c04 DJ |
33 | #include <signal.h> |
34 | #include <sys/ioctl.h> | |
35 | #include <fcntl.h> | |
0a30fbc4 | 36 | #include <unistd.h> |
fd500816 | 37 | #include <sys/syscall.h> |
f9387fc3 | 38 | #include <sched.h> |
07e059b5 VP |
39 | #include <ctype.h> |
40 | #include <pwd.h> | |
41 | #include <sys/types.h> | |
42 | #include <dirent.h> | |
53ce3c39 | 43 | #include <sys/stat.h> |
efcbbd14 | 44 | #include <sys/vfs.h> |
1570b33e | 45 | #include <sys/uio.h> |
602e3198 | 46 | #include "filestuff.h" |
c144c7a0 | 47 | #include "tracepoint.h" |
533b0600 | 48 | #include "hostio.h" |
957f3f49 DE |
49 | #ifndef ELFMAG0 |
50 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
51 | then ELFMAG0 will have been defined. If it didn't get included by | |
52 | gdb_proc_service.h then including it will likely introduce a duplicate | |
53 | definition of elf_fpregset_t. */ | |
54 | #include <elf.h> | |
55 | #endif | |
14d2069a | 56 | #include "nat/linux-namespaces.h" |
efcbbd14 UW |
57 | |
58 | #ifndef SPUFS_MAGIC | |
59 | #define SPUFS_MAGIC 0x23c9b64e | |
60 | #endif | |
da6d8c04 | 61 | |
03583c20 UW |
62 | #ifdef HAVE_PERSONALITY |
63 | # include <sys/personality.h> | |
64 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
65 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
66 | # endif | |
67 | #endif | |
68 | ||
fd462a61 DJ |
69 | #ifndef O_LARGEFILE |
70 | #define O_LARGEFILE 0 | |
71 | #endif | |
72 | ||
ec8ebe72 DE |
73 | #ifndef W_STOPCODE |
74 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
75 | #endif | |
76 | ||
1a981360 PA |
77 | /* This is the kernel's hard limit. Not to be confused with |
78 | SIGRTMIN. */ | |
79 | #ifndef __SIGRTMIN | |
80 | #define __SIGRTMIN 32 | |
81 | #endif | |
82 | ||
db0dfaa0 LM |
83 | /* Some targets did not define these ptrace constants from the start, |
84 | so gdbserver defines them locally here. In the future, these may | |
85 | be removed after they are added to asm/ptrace.h. */ | |
86 | #if !(defined(PT_TEXT_ADDR) \ | |
87 | || defined(PT_DATA_ADDR) \ | |
88 | || defined(PT_TEXT_END_ADDR)) | |
89 | #if defined(__mcoldfire__) | |
90 | /* These are still undefined in 3.10 kernels. */ | |
91 | #define PT_TEXT_ADDR 49*4 | |
92 | #define PT_DATA_ADDR 50*4 | |
93 | #define PT_TEXT_END_ADDR 51*4 | |
94 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
95 | #elif defined(BFIN) | |
96 | #define PT_TEXT_ADDR 220 | |
97 | #define PT_TEXT_END_ADDR 224 | |
98 | #define PT_DATA_ADDR 228 | |
99 | /* These are still undefined in 3.10 kernels. */ | |
100 | #elif defined(__TMS320C6X__) | |
101 | #define PT_TEXT_ADDR (0x10000*4) | |
102 | #define PT_DATA_ADDR (0x10004*4) | |
103 | #define PT_TEXT_END_ADDR (0x10008*4) | |
104 | #endif | |
105 | #endif | |
106 | ||
9accd112 | 107 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 108 | # include "nat/linux-btrace.h" |
734b0e4b | 109 | # include "btrace-common.h" |
9accd112 MM |
110 | #endif |
111 | ||
8365dcf5 TJB |
112 | #ifndef HAVE_ELF32_AUXV_T |
113 | /* Copied from glibc's elf.h. */ | |
114 | typedef struct | |
115 | { | |
116 | uint32_t a_type; /* Entry type */ | |
117 | union | |
118 | { | |
119 | uint32_t a_val; /* Integer value */ | |
120 | /* We use to have pointer elements added here. We cannot do that, | |
121 | though, since it does not work when using 32-bit definitions | |
122 | on 64-bit platforms and vice versa. */ | |
123 | } a_un; | |
124 | } Elf32_auxv_t; | |
125 | #endif | |
126 | ||
127 | #ifndef HAVE_ELF64_AUXV_T | |
128 | /* Copied from glibc's elf.h. */ | |
129 | typedef struct | |
130 | { | |
131 | uint64_t a_type; /* Entry type */ | |
132 | union | |
133 | { | |
134 | uint64_t a_val; /* Integer value */ | |
135 | /* We use to have pointer elements added here. We cannot do that, | |
136 | though, since it does not work when using 32-bit definitions | |
137 | on 64-bit platforms and vice versa. */ | |
138 | } a_un; | |
139 | } Elf64_auxv_t; | |
140 | #endif | |
141 | ||
cff068da GB |
142 | /* LWP accessors. */ |
143 | ||
144 | /* See nat/linux-nat.h. */ | |
145 | ||
146 | ptid_t | |
147 | ptid_of_lwp (struct lwp_info *lwp) | |
148 | { | |
149 | return ptid_of (get_lwp_thread (lwp)); | |
150 | } | |
151 | ||
152 | /* See nat/linux-nat.h. */ | |
153 | ||
4b134ca1 GB |
154 | void |
155 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
156 | struct arch_lwp_info *info) | |
157 | { | |
158 | lwp->arch_private = info; | |
159 | } | |
160 | ||
161 | /* See nat/linux-nat.h. */ | |
162 | ||
163 | struct arch_lwp_info * | |
164 | lwp_arch_private_info (struct lwp_info *lwp) | |
165 | { | |
166 | return lwp->arch_private; | |
167 | } | |
168 | ||
169 | /* See nat/linux-nat.h. */ | |
170 | ||
cff068da GB |
171 | int |
172 | lwp_is_stopped (struct lwp_info *lwp) | |
173 | { | |
174 | return lwp->stopped; | |
175 | } | |
176 | ||
177 | /* See nat/linux-nat.h. */ | |
178 | ||
179 | enum target_stop_reason | |
180 | lwp_stop_reason (struct lwp_info *lwp) | |
181 | { | |
182 | return lwp->stop_reason; | |
183 | } | |
184 | ||
05044653 PA |
185 | /* A list of all unknown processes which receive stop signals. Some |
186 | other process will presumably claim each of these as forked | |
187 | children momentarily. */ | |
24a09b5f | 188 | |
05044653 PA |
189 | struct simple_pid_list |
190 | { | |
191 | /* The process ID. */ | |
192 | int pid; | |
193 | ||
194 | /* The status as reported by waitpid. */ | |
195 | int status; | |
196 | ||
197 | /* Next in chain. */ | |
198 | struct simple_pid_list *next; | |
199 | }; | |
200 | struct simple_pid_list *stopped_pids; | |
201 | ||
202 | /* Trivial list manipulation functions to keep track of a list of new | |
203 | stopped processes. */ | |
204 | ||
205 | static void | |
206 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
207 | { | |
208 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
209 | ||
210 | new_pid->pid = pid; | |
211 | new_pid->status = status; | |
212 | new_pid->next = *listp; | |
213 | *listp = new_pid; | |
214 | } | |
215 | ||
216 | static int | |
217 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
218 | { | |
219 | struct simple_pid_list **p; | |
220 | ||
221 | for (p = listp; *p != NULL; p = &(*p)->next) | |
222 | if ((*p)->pid == pid) | |
223 | { | |
224 | struct simple_pid_list *next = (*p)->next; | |
225 | ||
226 | *statusp = (*p)->status; | |
227 | xfree (*p); | |
228 | *p = next; | |
229 | return 1; | |
230 | } | |
231 | return 0; | |
232 | } | |
24a09b5f | 233 | |
bde24c0a PA |
234 | enum stopping_threads_kind |
235 | { | |
236 | /* Not stopping threads presently. */ | |
237 | NOT_STOPPING_THREADS, | |
238 | ||
239 | /* Stopping threads. */ | |
240 | STOPPING_THREADS, | |
241 | ||
242 | /* Stopping and suspending threads. */ | |
243 | STOPPING_AND_SUSPENDING_THREADS | |
244 | }; | |
245 | ||
246 | /* This is set while stop_all_lwps is in effect. */ | |
247 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
248 | |
249 | /* FIXME make into a target method? */ | |
24a09b5f | 250 | int using_threads = 1; |
24a09b5f | 251 | |
fa593d66 PA |
252 | /* True if we're presently stabilizing threads (moving them out of |
253 | jump pads). */ | |
254 | static int stabilizing_threads; | |
255 | ||
2acc282a | 256 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 257 | int step, int signal, siginfo_t *info); |
2bd7c093 | 258 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
259 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
260 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
fa96cb38 PA |
261 | static int linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
262 | int *wstat, int options); | |
95954743 | 263 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
b3312d80 | 264 | static struct lwp_info *add_lwp (ptid_t ptid); |
c35fafde | 265 | static int linux_stopped_by_watchpoint (void); |
95954743 | 266 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 267 | static void proceed_all_lwps (void); |
d50171e4 | 268 | static int finish_step_over (struct lwp_info *lwp); |
d50171e4 PA |
269 | static int kill_lwp (unsigned long lwpid, int signo); |
270 | ||
582511be PA |
271 | /* When the event-loop is doing a step-over, this points at the thread |
272 | being stepped. */ | |
273 | ptid_t step_over_bkpt; | |
274 | ||
d50171e4 PA |
275 | /* True if the low target can hardware single-step. Such targets |
276 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
277 | ||
278 | static int | |
279 | can_hardware_single_step (void) | |
280 | { | |
281 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
282 | } | |
283 | ||
284 | /* True if the low target supports memory breakpoints. If so, we'll | |
285 | have a GET_PC implementation. */ | |
286 | ||
287 | static int | |
288 | supports_breakpoints (void) | |
289 | { | |
290 | return (the_low_target.get_pc != NULL); | |
291 | } | |
0d62e5e8 | 292 | |
fa593d66 PA |
293 | /* Returns true if this target can support fast tracepoints. This |
294 | does not mean that the in-process agent has been loaded in the | |
295 | inferior. */ | |
296 | ||
297 | static int | |
298 | supports_fast_tracepoints (void) | |
299 | { | |
300 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
301 | } | |
302 | ||
c2d6af84 PA |
303 | /* True if LWP is stopped in its stepping range. */ |
304 | ||
305 | static int | |
306 | lwp_in_step_range (struct lwp_info *lwp) | |
307 | { | |
308 | CORE_ADDR pc = lwp->stop_pc; | |
309 | ||
310 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
311 | } | |
312 | ||
0d62e5e8 DJ |
313 | struct pending_signals |
314 | { | |
315 | int signal; | |
32ca6d61 | 316 | siginfo_t info; |
0d62e5e8 DJ |
317 | struct pending_signals *prev; |
318 | }; | |
611cb4a5 | 319 | |
bd99dc85 PA |
320 | /* The read/write ends of the pipe registered as waitable file in the |
321 | event loop. */ | |
322 | static int linux_event_pipe[2] = { -1, -1 }; | |
323 | ||
324 | /* True if we're currently in async mode. */ | |
325 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
326 | ||
02fc4de7 | 327 | static void send_sigstop (struct lwp_info *lwp); |
fa96cb38 | 328 | static void wait_for_sigstop (void); |
bd99dc85 | 329 | |
d0722149 DE |
330 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
331 | ||
332 | static int | |
214d508e | 333 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 334 | { |
214d508e L |
335 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
336 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
337 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
338 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
339 | { | |
340 | *machine = header->e_machine; | |
341 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
342 | ||
343 | } | |
344 | *machine = EM_NONE; | |
345 | return -1; | |
d0722149 DE |
346 | } |
347 | ||
348 | /* Return non-zero if FILE is a 64-bit ELF file, | |
349 | zero if the file is not a 64-bit ELF file, | |
350 | and -1 if the file is not accessible or doesn't exist. */ | |
351 | ||
be07f1a2 | 352 | static int |
214d508e | 353 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 354 | { |
957f3f49 | 355 | Elf64_Ehdr header; |
d0722149 DE |
356 | int fd; |
357 | ||
358 | fd = open (file, O_RDONLY); | |
359 | if (fd < 0) | |
360 | return -1; | |
361 | ||
362 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
363 | { | |
364 | close (fd); | |
365 | return 0; | |
366 | } | |
367 | close (fd); | |
368 | ||
214d508e | 369 | return elf_64_header_p (&header, machine); |
d0722149 DE |
370 | } |
371 | ||
be07f1a2 PA |
372 | /* Accepts an integer PID; Returns true if the executable PID is |
373 | running is a 64-bit ELF file.. */ | |
374 | ||
375 | int | |
214d508e | 376 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 377 | { |
d8d2a3ee | 378 | char file[PATH_MAX]; |
be07f1a2 PA |
379 | |
380 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 381 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
382 | } |
383 | ||
bd99dc85 PA |
384 | static void |
385 | delete_lwp (struct lwp_info *lwp) | |
386 | { | |
fa96cb38 PA |
387 | struct thread_info *thr = get_lwp_thread (lwp); |
388 | ||
389 | if (debug_threads) | |
390 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
391 | ||
392 | remove_thread (thr); | |
aa5ca48f | 393 | free (lwp->arch_private); |
bd99dc85 PA |
394 | free (lwp); |
395 | } | |
396 | ||
95954743 PA |
397 | /* Add a process to the common process list, and set its private |
398 | data. */ | |
399 | ||
400 | static struct process_info * | |
401 | linux_add_process (int pid, int attached) | |
402 | { | |
403 | struct process_info *proc; | |
404 | ||
95954743 | 405 | proc = add_process (pid, attached); |
fe978cb0 | 406 | proc->priv = xcalloc (1, sizeof (*proc->priv)); |
95954743 | 407 | |
aa5ca48f | 408 | if (the_low_target.new_process != NULL) |
fe978cb0 | 409 | proc->priv->arch_private = the_low_target.new_process (); |
aa5ca48f | 410 | |
95954743 PA |
411 | return proc; |
412 | } | |
413 | ||
582511be PA |
414 | static CORE_ADDR get_pc (struct lwp_info *lwp); |
415 | ||
bd99dc85 | 416 | /* Handle a GNU/Linux extended wait response. If we see a clone |
de0d863e DB |
417 | event, we need to add the new LWP to our list (and return 0 so as |
418 | not to report the trap to higher layers). */ | |
0d62e5e8 | 419 | |
de0d863e DB |
420 | static int |
421 | handle_extended_wait (struct lwp_info *event_lwp, int wstat) | |
24a09b5f | 422 | { |
89a5711c | 423 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 424 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
54a0b537 | 425 | struct lwp_info *new_lwp; |
24a09b5f | 426 | |
c269dbdb DB |
427 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
428 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f | 429 | { |
95954743 | 430 | ptid_t ptid; |
24a09b5f | 431 | unsigned long new_pid; |
05044653 | 432 | int ret, status; |
24a09b5f | 433 | |
de0d863e | 434 | /* Get the pid of the new lwp. */ |
d86d4aaf | 435 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 436 | &new_pid); |
24a09b5f DJ |
437 | |
438 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 439 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
440 | { |
441 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
442 | hits the SIGSTOP, but we're already attached. */ | |
443 | ||
97438e3f | 444 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
445 | |
446 | if (ret == -1) | |
447 | perror_with_name ("waiting for new child"); | |
448 | else if (ret != new_pid) | |
449 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 450 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
451 | warning ("wait returned unexpected status 0x%x", status); |
452 | } | |
453 | ||
c269dbdb | 454 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
de0d863e DB |
455 | { |
456 | struct process_info *parent_proc; | |
457 | struct process_info *child_proc; | |
458 | struct lwp_info *child_lwp; | |
bfacd19d | 459 | struct thread_info *child_thr; |
de0d863e DB |
460 | struct target_desc *tdesc; |
461 | ||
462 | ptid = ptid_build (new_pid, new_pid, 0); | |
463 | ||
464 | if (debug_threads) | |
465 | { | |
466 | debug_printf ("HEW: Got fork event from LWP %ld, " | |
467 | "new child is %d\n", | |
468 | ptid_get_lwp (ptid_of (event_thr)), | |
469 | ptid_get_pid (ptid)); | |
470 | } | |
471 | ||
472 | /* Add the new process to the tables and clone the breakpoint | |
473 | lists of the parent. We need to do this even if the new process | |
474 | will be detached, since we will need the process object and the | |
475 | breakpoints to remove any breakpoints from memory when we | |
476 | detach, and the client side will access registers. */ | |
477 | child_proc = linux_add_process (new_pid, 0); | |
478 | gdb_assert (child_proc != NULL); | |
479 | child_lwp = add_lwp (ptid); | |
480 | gdb_assert (child_lwp != NULL); | |
481 | child_lwp->stopped = 1; | |
bfacd19d DB |
482 | child_lwp->must_set_ptrace_flags = 1; |
483 | child_lwp->status_pending_p = 0; | |
484 | child_thr = get_lwp_thread (child_lwp); | |
485 | child_thr->last_resume_kind = resume_stop; | |
de0d863e DB |
486 | parent_proc = get_thread_process (event_thr); |
487 | child_proc->attached = parent_proc->attached; | |
488 | clone_all_breakpoints (&child_proc->breakpoints, | |
489 | &child_proc->raw_breakpoints, | |
490 | parent_proc->breakpoints); | |
491 | ||
492 | tdesc = xmalloc (sizeof (struct target_desc)); | |
493 | copy_target_description (tdesc, parent_proc->tdesc); | |
494 | child_proc->tdesc = tdesc; | |
de0d863e | 495 | |
3a8a0396 DB |
496 | /* Clone arch-specific process data. */ |
497 | if (the_low_target.new_fork != NULL) | |
498 | the_low_target.new_fork (parent_proc, child_proc); | |
499 | ||
de0d863e | 500 | /* Save fork info in the parent thread. */ |
c269dbdb DB |
501 | if (event == PTRACE_EVENT_FORK) |
502 | event_lwp->waitstatus.kind = TARGET_WAITKIND_FORKED; | |
503 | else if (event == PTRACE_EVENT_VFORK) | |
504 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORKED; | |
505 | ||
de0d863e | 506 | event_lwp->waitstatus.value.related_pid = ptid; |
c269dbdb | 507 | |
de0d863e DB |
508 | /* The status_pending field contains bits denoting the |
509 | extended event, so when the pending event is handled, | |
510 | the handler will look at lwp->waitstatus. */ | |
511 | event_lwp->status_pending_p = 1; | |
512 | event_lwp->status_pending = wstat; | |
513 | ||
514 | /* Report the event. */ | |
515 | return 0; | |
516 | } | |
517 | ||
fa96cb38 PA |
518 | if (debug_threads) |
519 | debug_printf ("HEW: Got clone event " | |
520 | "from LWP %ld, new child is LWP %ld\n", | |
521 | lwpid_of (event_thr), new_pid); | |
522 | ||
d86d4aaf | 523 | ptid = ptid_build (pid_of (event_thr), new_pid, 0); |
b3312d80 | 524 | new_lwp = add_lwp (ptid); |
24a09b5f | 525 | |
e27d73f6 DE |
526 | /* Either we're going to immediately resume the new thread |
527 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
528 | thinks the thread is currently running, so set this first | |
529 | before calling linux_resume_one_lwp. */ | |
530 | new_lwp->stopped = 1; | |
531 | ||
bde24c0a PA |
532 | /* If we're suspending all threads, leave this one suspended |
533 | too. */ | |
534 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
535 | new_lwp->suspended = 1; | |
536 | ||
da5898ce DJ |
537 | /* Normally we will get the pending SIGSTOP. But in some cases |
538 | we might get another signal delivered to the group first. | |
f21cc1a2 | 539 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 540 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 541 | { |
54a0b537 | 542 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
543 | new_lwp->status_pending_p = 1; |
544 | new_lwp->status_pending = status; | |
da5898ce | 545 | } |
de0d863e DB |
546 | |
547 | /* Don't report the event. */ | |
548 | return 1; | |
24a09b5f | 549 | } |
c269dbdb DB |
550 | else if (event == PTRACE_EVENT_VFORK_DONE) |
551 | { | |
552 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
553 | ||
554 | /* Report the event. */ | |
555 | return 0; | |
556 | } | |
de0d863e DB |
557 | |
558 | internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event); | |
24a09b5f DJ |
559 | } |
560 | ||
d50171e4 PA |
561 | /* Return the PC as read from the regcache of LWP, without any |
562 | adjustment. */ | |
563 | ||
564 | static CORE_ADDR | |
565 | get_pc (struct lwp_info *lwp) | |
566 | { | |
0bfdf32f | 567 | struct thread_info *saved_thread; |
d50171e4 PA |
568 | struct regcache *regcache; |
569 | CORE_ADDR pc; | |
570 | ||
571 | if (the_low_target.get_pc == NULL) | |
572 | return 0; | |
573 | ||
0bfdf32f GB |
574 | saved_thread = current_thread; |
575 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 576 | |
0bfdf32f | 577 | regcache = get_thread_regcache (current_thread, 1); |
d50171e4 PA |
578 | pc = (*the_low_target.get_pc) (regcache); |
579 | ||
580 | if (debug_threads) | |
87ce2a04 | 581 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 582 | |
0bfdf32f | 583 | current_thread = saved_thread; |
d50171e4 PA |
584 | return pc; |
585 | } | |
586 | ||
587 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
588 | The SIGTRAP could mean several things. |
589 | ||
590 | On i386, where decr_pc_after_break is non-zero: | |
582511be PA |
591 | |
592 | If we were single-stepping this process using PTRACE_SINGLESTEP, we | |
593 | will get only the one SIGTRAP. The value of $eip will be the next | |
594 | instruction. If the instruction we stepped over was a breakpoint, | |
595 | we need to decrement the PC. | |
596 | ||
0d62e5e8 DJ |
597 | If we continue the process using PTRACE_CONT, we will get a |
598 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
599 | the instruction after the breakpoint (i.e. needs to be | |
600 | decremented). If we report the SIGTRAP to GDB, we must also | |
582511be | 601 | report the undecremented PC. If the breakpoint is removed, we |
0d62e5e8 DJ |
602 | must resume at the decremented PC. |
603 | ||
582511be PA |
604 | On a non-decr_pc_after_break machine with hardware or kernel |
605 | single-step: | |
606 | ||
607 | If we either single-step a breakpoint instruction, or continue and | |
608 | hit a breakpoint instruction, our PC will point at the breakpoint | |
0d62e5e8 DJ |
609 | instruction. */ |
610 | ||
582511be PA |
611 | static int |
612 | check_stopped_by_breakpoint (struct lwp_info *lwp) | |
0d62e5e8 | 613 | { |
582511be PA |
614 | CORE_ADDR pc; |
615 | CORE_ADDR sw_breakpoint_pc; | |
616 | struct thread_info *saved_thread; | |
3e572f71 PA |
617 | #if USE_SIGTRAP_SIGINFO |
618 | siginfo_t siginfo; | |
619 | #endif | |
d50171e4 PA |
620 | |
621 | if (the_low_target.get_pc == NULL) | |
622 | return 0; | |
0d62e5e8 | 623 | |
582511be PA |
624 | pc = get_pc (lwp); |
625 | sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break; | |
d50171e4 | 626 | |
582511be PA |
627 | /* breakpoint_at reads from the current thread. */ |
628 | saved_thread = current_thread; | |
629 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 630 | |
3e572f71 PA |
631 | #if USE_SIGTRAP_SIGINFO |
632 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
633 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
634 | { | |
635 | if (siginfo.si_signo == SIGTRAP) | |
636 | { | |
637 | if (siginfo.si_code == GDB_ARCH_TRAP_BRKPT) | |
638 | { | |
639 | if (debug_threads) | |
640 | { | |
641 | struct thread_info *thr = get_lwp_thread (lwp); | |
642 | ||
2bf6fb9d | 643 | debug_printf ("CSBB: %s stopped by software breakpoint\n", |
3e572f71 PA |
644 | target_pid_to_str (ptid_of (thr))); |
645 | } | |
646 | ||
647 | /* Back up the PC if necessary. */ | |
648 | if (pc != sw_breakpoint_pc) | |
649 | { | |
650 | struct regcache *regcache | |
651 | = get_thread_regcache (current_thread, 1); | |
652 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
653 | } | |
654 | ||
655 | lwp->stop_pc = sw_breakpoint_pc; | |
656 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
657 | current_thread = saved_thread; | |
658 | return 1; | |
659 | } | |
660 | else if (siginfo.si_code == TRAP_HWBKPT) | |
661 | { | |
662 | if (debug_threads) | |
663 | { | |
664 | struct thread_info *thr = get_lwp_thread (lwp); | |
665 | ||
2bf6fb9d PA |
666 | debug_printf ("CSBB: %s stopped by hardware " |
667 | "breakpoint/watchpoint\n", | |
3e572f71 PA |
668 | target_pid_to_str (ptid_of (thr))); |
669 | } | |
670 | ||
671 | lwp->stop_pc = pc; | |
672 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
673 | current_thread = saved_thread; | |
674 | return 1; | |
675 | } | |
2bf6fb9d PA |
676 | else if (siginfo.si_code == TRAP_TRACE) |
677 | { | |
678 | if (debug_threads) | |
679 | { | |
680 | struct thread_info *thr = get_lwp_thread (lwp); | |
681 | ||
682 | debug_printf ("CSBB: %s stopped by trace\n", | |
683 | target_pid_to_str (ptid_of (thr))); | |
684 | } | |
685 | } | |
3e572f71 PA |
686 | } |
687 | } | |
688 | #else | |
582511be PA |
689 | /* We may have just stepped a breakpoint instruction. E.g., in |
690 | non-stop mode, GDB first tells the thread A to step a range, and | |
691 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
692 | case we need to report the breakpoint PC. */ |
693 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
582511be PA |
694 | && (*the_low_target.breakpoint_at) (sw_breakpoint_pc)) |
695 | { | |
696 | if (debug_threads) | |
697 | { | |
698 | struct thread_info *thr = get_lwp_thread (lwp); | |
699 | ||
700 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
701 | target_pid_to_str (ptid_of (thr))); | |
702 | } | |
703 | ||
704 | /* Back up the PC if necessary. */ | |
705 | if (pc != sw_breakpoint_pc) | |
706 | { | |
707 | struct regcache *regcache | |
708 | = get_thread_regcache (current_thread, 1); | |
709 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
710 | } | |
711 | ||
712 | lwp->stop_pc = sw_breakpoint_pc; | |
15c66dd6 | 713 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
582511be PA |
714 | current_thread = saved_thread; |
715 | return 1; | |
716 | } | |
717 | ||
718 | if (hardware_breakpoint_inserted_here (pc)) | |
719 | { | |
720 | if (debug_threads) | |
721 | { | |
722 | struct thread_info *thr = get_lwp_thread (lwp); | |
723 | ||
724 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
725 | target_pid_to_str (ptid_of (thr))); | |
726 | } | |
47c0c975 | 727 | |
582511be | 728 | lwp->stop_pc = pc; |
15c66dd6 | 729 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; |
582511be PA |
730 | current_thread = saved_thread; |
731 | return 1; | |
732 | } | |
3e572f71 | 733 | #endif |
582511be PA |
734 | |
735 | current_thread = saved_thread; | |
736 | return 0; | |
0d62e5e8 | 737 | } |
ce3a066d | 738 | |
b3312d80 | 739 | static struct lwp_info * |
95954743 | 740 | add_lwp (ptid_t ptid) |
611cb4a5 | 741 | { |
54a0b537 | 742 | struct lwp_info *lwp; |
0d62e5e8 | 743 | |
54a0b537 PA |
744 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
745 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 746 | |
aa5ca48f | 747 | if (the_low_target.new_thread != NULL) |
34c703da | 748 | the_low_target.new_thread (lwp); |
aa5ca48f | 749 | |
f7667f0d | 750 | lwp->thread = add_thread (ptid, lwp); |
0d62e5e8 | 751 | |
54a0b537 | 752 | return lwp; |
0d62e5e8 | 753 | } |
611cb4a5 | 754 | |
da6d8c04 DJ |
755 | /* Start an inferior process and returns its pid. |
756 | ALLARGS is a vector of program-name and args. */ | |
757 | ||
ce3a066d DJ |
758 | static int |
759 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 760 | { |
a6dbe5df | 761 | struct lwp_info *new_lwp; |
da6d8c04 | 762 | int pid; |
95954743 | 763 | ptid_t ptid; |
8cc73a39 SDJ |
764 | struct cleanup *restore_personality |
765 | = maybe_disable_address_space_randomization (disable_randomization); | |
5ae3ebba | 766 | struct process_info *proc; |
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 | |
5ae3ebba YQ |
814 | proc = linux_add_process (pid, 0); |
815 | /* Set the arch when the first LWP stops. */ | |
816 | proc->priv->new_inferior = 1; | |
95954743 PA |
817 | |
818 | ptid = ptid_build (pid, pid, 0); | |
819 | new_lwp = add_lwp (ptid); | |
a6dbe5df | 820 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 821 | |
a9fa9f7d | 822 | return pid; |
da6d8c04 DJ |
823 | } |
824 | ||
8784d563 PA |
825 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
826 | error. */ | |
da6d8c04 | 827 | |
7ae1a6a6 PA |
828 | int |
829 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 830 | { |
54a0b537 | 831 | struct lwp_info *new_lwp; |
7ae1a6a6 | 832 | int lwpid = ptid_get_lwp (ptid); |
611cb4a5 | 833 | |
b8e1b30e | 834 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 835 | != 0) |
7ae1a6a6 | 836 | return errno; |
24a09b5f | 837 | |
b3312d80 | 838 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 839 | |
a6dbe5df PA |
840 | /* We need to wait for SIGSTOP before being able to make the next |
841 | ptrace call on this LWP. */ | |
842 | new_lwp->must_set_ptrace_flags = 1; | |
843 | ||
644cebc9 | 844 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
845 | { |
846 | if (debug_threads) | |
87ce2a04 | 847 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
848 | |
849 | /* The process is definitely stopped. It is in a job control | |
850 | stop, unless the kernel predates the TASK_STOPPED / | |
851 | TASK_TRACED distinction, in which case it might be in a | |
852 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
853 | can kill it, signal it, et cetera. | |
854 | ||
855 | First make sure there is a pending SIGSTOP. Since we are | |
856 | already attached, the process can not transition from stopped | |
857 | to running without a PTRACE_CONT; so we know this signal will | |
858 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
859 | probably already in the queue (unless this kernel is old | |
860 | enough to use TASK_STOPPED for ptrace stops); but since | |
861 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
862 | kill_lwp (lwpid, SIGSTOP); | |
863 | ||
864 | /* Finally, resume the stopped process. This will deliver the | |
865 | SIGSTOP (or a higher priority signal, just like normal | |
866 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 867 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
868 | } |
869 | ||
0d62e5e8 | 870 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
871 | brings it to a halt. |
872 | ||
873 | There are several cases to consider here: | |
874 | ||
875 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 876 | of a new thread that is being created. |
d50171e4 PA |
877 | In this case we should ignore that SIGSTOP and resume the |
878 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 879 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 880 | resume_continue. |
0e21c1ec DE |
881 | |
882 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
883 | to it via attach_inferior. |
884 | In this case we want the process thread to stop. | |
d50171e4 PA |
885 | This is handled by having linux_attach set last_resume_kind == |
886 | resume_stop after we return. | |
e3deef73 LM |
887 | |
888 | If the pid we are attaching to is also the tgid, we attach to and | |
889 | stop all the existing threads. Otherwise, we attach to pid and | |
890 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
891 | |
892 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
893 | existing threads. |
894 | In this case we want the thread to stop. | |
895 | FIXME: This case is currently not properly handled. | |
896 | We should wait for the SIGSTOP but don't. Things work apparently | |
897 | because enough time passes between when we ptrace (ATTACH) and when | |
898 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
899 | |
900 | On the other hand, if we are currently trying to stop all threads, we | |
901 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 902 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
903 | end of the list, and so the new thread has not yet reached |
904 | wait_for_sigstop (but will). */ | |
d50171e4 | 905 | new_lwp->stop_expected = 1; |
0d62e5e8 | 906 | |
7ae1a6a6 | 907 | return 0; |
95954743 PA |
908 | } |
909 | ||
8784d563 PA |
910 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
911 | already attached. Returns true if a new LWP is found, false | |
912 | otherwise. */ | |
913 | ||
914 | static int | |
915 | attach_proc_task_lwp_callback (ptid_t ptid) | |
916 | { | |
917 | /* Is this a new thread? */ | |
918 | if (find_thread_ptid (ptid) == NULL) | |
919 | { | |
920 | int lwpid = ptid_get_lwp (ptid); | |
921 | int err; | |
922 | ||
923 | if (debug_threads) | |
924 | debug_printf ("Found new lwp %d\n", lwpid); | |
925 | ||
926 | err = linux_attach_lwp (ptid); | |
927 | ||
928 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
929 | is returned if the thread's task still exists, and is marked | |
930 | as exited or zombie, as well as other conditions, so in that | |
931 | case, confirm the status in /proc/PID/status. */ | |
932 | if (err == ESRCH | |
933 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
934 | { | |
935 | if (debug_threads) | |
936 | { | |
937 | debug_printf ("Cannot attach to lwp %d: " | |
938 | "thread is gone (%d: %s)\n", | |
939 | lwpid, err, strerror (err)); | |
940 | } | |
941 | } | |
942 | else if (err != 0) | |
943 | { | |
944 | warning (_("Cannot attach to lwp %d: %s"), | |
945 | lwpid, | |
946 | linux_ptrace_attach_fail_reason_string (ptid, err)); | |
947 | } | |
948 | ||
949 | return 1; | |
950 | } | |
951 | return 0; | |
952 | } | |
953 | ||
e3deef73 LM |
954 | /* Attach to PID. If PID is the tgid, attach to it and all |
955 | of its threads. */ | |
956 | ||
c52daf70 | 957 | static int |
a1928bad | 958 | linux_attach (unsigned long pid) |
0d62e5e8 | 959 | { |
7ae1a6a6 PA |
960 | ptid_t ptid = ptid_build (pid, pid, 0); |
961 | int err; | |
5ae3ebba | 962 | struct process_info *proc; |
7ae1a6a6 | 963 | |
e3deef73 LM |
964 | /* Attach to PID. We will check for other threads |
965 | soon. */ | |
7ae1a6a6 PA |
966 | err = linux_attach_lwp (ptid); |
967 | if (err != 0) | |
968 | error ("Cannot attach to process %ld: %s", | |
8784d563 | 969 | pid, linux_ptrace_attach_fail_reason_string (ptid, err)); |
7ae1a6a6 | 970 | |
5ae3ebba YQ |
971 | proc = linux_add_process (pid, 1); |
972 | /* Set the arch when the first LWP stops. */ | |
973 | proc->priv->new_inferior = 1; | |
0d62e5e8 | 974 | |
bd99dc85 PA |
975 | if (!non_stop) |
976 | { | |
8336d594 PA |
977 | struct thread_info *thread; |
978 | ||
979 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
980 | process. It will be collected by wait shortly. */ | |
981 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
982 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 983 | } |
0d62e5e8 | 984 | |
8784d563 PA |
985 | /* We must attach to every LWP. If /proc is mounted, use that to |
986 | find them now. On the one hand, the inferior may be using raw | |
987 | clone instead of using pthreads. On the other hand, even if it | |
988 | is using pthreads, GDB may not be connected yet (thread_db needs | |
989 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
990 | structures in the inferior's address space to find the list of | |
991 | threads/LWPs, and those structures may well be corrupted. Note | |
992 | that once thread_db is loaded, we'll still use it to list threads | |
993 | and associate pthread info with each LWP. */ | |
994 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
95954743 PA |
995 | return 0; |
996 | } | |
997 | ||
998 | struct counter | |
999 | { | |
1000 | int pid; | |
1001 | int count; | |
1002 | }; | |
1003 | ||
1004 | static int | |
1005 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
1006 | { | |
1007 | struct counter *counter = args; | |
1008 | ||
1009 | if (ptid_get_pid (entry->id) == counter->pid) | |
1010 | { | |
1011 | if (++counter->count > 1) | |
1012 | return 1; | |
1013 | } | |
d61ddec4 | 1014 | |
da6d8c04 DJ |
1015 | return 0; |
1016 | } | |
1017 | ||
95954743 | 1018 | static int |
fa96cb38 | 1019 | last_thread_of_process_p (int pid) |
95954743 | 1020 | { |
95954743 | 1021 | struct counter counter = { pid , 0 }; |
da6d8c04 | 1022 | |
95954743 PA |
1023 | return (find_inferior (&all_threads, |
1024 | second_thread_of_pid_p, &counter) == NULL); | |
1025 | } | |
1026 | ||
da84f473 PA |
1027 | /* Kill LWP. */ |
1028 | ||
1029 | static void | |
1030 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1031 | { | |
d86d4aaf DE |
1032 | struct thread_info *thr = get_lwp_thread (lwp); |
1033 | int pid = lwpid_of (thr); | |
da84f473 PA |
1034 | |
1035 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1036 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1037 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1038 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1039 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1040 | per process, not one for each thread. But since we still support | |
1041 | linuxthreads, and we also support debugging programs using raw | |
1042 | clone without CLONE_THREAD, we send one for each thread. For | |
1043 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
1044 | about some old kernels where PTRACE_KILL might work better | |
1045 | (dubious if there are any such, but that's why it's paranoia), so | |
1046 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
1047 | everywhere. */ | |
1048 | ||
1049 | errno = 0; | |
69ff6be5 | 1050 | kill_lwp (pid, SIGKILL); |
da84f473 | 1051 | if (debug_threads) |
ce9e3fe7 PA |
1052 | { |
1053 | int save_errno = errno; | |
1054 | ||
1055 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
1056 | target_pid_to_str (ptid_of (thr)), | |
1057 | save_errno ? strerror (save_errno) : "OK"); | |
1058 | } | |
da84f473 PA |
1059 | |
1060 | errno = 0; | |
b8e1b30e | 1061 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1062 | if (debug_threads) |
ce9e3fe7 PA |
1063 | { |
1064 | int save_errno = errno; | |
1065 | ||
1066 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
1067 | target_pid_to_str (ptid_of (thr)), | |
1068 | save_errno ? strerror (save_errno) : "OK"); | |
1069 | } | |
da84f473 PA |
1070 | } |
1071 | ||
e76126e8 PA |
1072 | /* Kill LWP and wait for it to die. */ |
1073 | ||
1074 | static void | |
1075 | kill_wait_lwp (struct lwp_info *lwp) | |
1076 | { | |
1077 | struct thread_info *thr = get_lwp_thread (lwp); | |
1078 | int pid = ptid_get_pid (ptid_of (thr)); | |
1079 | int lwpid = ptid_get_lwp (ptid_of (thr)); | |
1080 | int wstat; | |
1081 | int res; | |
1082 | ||
1083 | if (debug_threads) | |
1084 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
1085 | ||
1086 | do | |
1087 | { | |
1088 | linux_kill_one_lwp (lwp); | |
1089 | ||
1090 | /* Make sure it died. Notes: | |
1091 | ||
1092 | - The loop is most likely unnecessary. | |
1093 | ||
1094 | - We don't use linux_wait_for_event as that could delete lwps | |
1095 | while we're iterating over them. We're not interested in | |
1096 | any pending status at this point, only in making sure all | |
1097 | wait status on the kernel side are collected until the | |
1098 | process is reaped. | |
1099 | ||
1100 | - We don't use __WALL here as the __WALL emulation relies on | |
1101 | SIGCHLD, and killing a stopped process doesn't generate | |
1102 | one, nor an exit status. | |
1103 | */ | |
1104 | res = my_waitpid (lwpid, &wstat, 0); | |
1105 | if (res == -1 && errno == ECHILD) | |
1106 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1107 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1108 | ||
586b02a9 PA |
1109 | /* Even if it was stopped, the child may have already disappeared. |
1110 | E.g., if it was killed by SIGKILL. */ | |
1111 | if (res < 0 && errno != ECHILD) | |
1112 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1113 | } |
1114 | ||
da84f473 PA |
1115 | /* Callback for `find_inferior'. Kills an lwp of a given process, |
1116 | except the leader. */ | |
95954743 PA |
1117 | |
1118 | static int | |
da84f473 | 1119 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 1120 | { |
0d62e5e8 | 1121 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 1122 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
1123 | int pid = * (int *) args; |
1124 | ||
1125 | if (ptid_get_pid (entry->id) != pid) | |
1126 | return 0; | |
0d62e5e8 | 1127 | |
fd500816 DJ |
1128 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1129 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1130 | the children get a chance to be reaped, it will remain a zombie | |
1131 | forever. */ | |
95954743 | 1132 | |
d86d4aaf | 1133 | if (lwpid_of (thread) == pid) |
95954743 PA |
1134 | { |
1135 | if (debug_threads) | |
87ce2a04 DE |
1136 | debug_printf ("lkop: is last of process %s\n", |
1137 | target_pid_to_str (entry->id)); | |
95954743 PA |
1138 | return 0; |
1139 | } | |
fd500816 | 1140 | |
e76126e8 | 1141 | kill_wait_lwp (lwp); |
95954743 | 1142 | return 0; |
da6d8c04 DJ |
1143 | } |
1144 | ||
95954743 PA |
1145 | static int |
1146 | linux_kill (int pid) | |
0d62e5e8 | 1147 | { |
95954743 | 1148 | struct process_info *process; |
54a0b537 | 1149 | struct lwp_info *lwp; |
fd500816 | 1150 | |
95954743 PA |
1151 | process = find_process_pid (pid); |
1152 | if (process == NULL) | |
1153 | return -1; | |
9d606399 | 1154 | |
f9e39928 PA |
1155 | /* If we're killing a running inferior, make sure it is stopped |
1156 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1157 | stop_all_lwps (0, NULL); |
f9e39928 | 1158 | |
da84f473 | 1159 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1160 | |
54a0b537 | 1161 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1162 | thread in the list, so do so now. */ |
95954743 | 1163 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1164 | |
784867a5 | 1165 | if (lwp == NULL) |
fd500816 | 1166 | { |
784867a5 | 1167 | if (debug_threads) |
d86d4aaf DE |
1168 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1169 | pid); | |
784867a5 JK |
1170 | } |
1171 | else | |
e76126e8 | 1172 | kill_wait_lwp (lwp); |
2d717e4f | 1173 | |
8336d594 | 1174 | the_target->mourn (process); |
f9e39928 PA |
1175 | |
1176 | /* Since we presently can only stop all lwps of all processes, we | |
1177 | need to unstop lwps of other processes. */ | |
7984d532 | 1178 | unstop_all_lwps (0, NULL); |
95954743 | 1179 | return 0; |
0d62e5e8 DJ |
1180 | } |
1181 | ||
9b224c5e PA |
1182 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1183 | signal the thread last stopped for, which we need to deliver to the | |
1184 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1185 | ||
1186 | static int | |
1187 | get_detach_signal (struct thread_info *thread) | |
1188 | { | |
a493e3e2 | 1189 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1190 | int status; |
1191 | struct lwp_info *lp = get_thread_lwp (thread); | |
1192 | ||
1193 | if (lp->status_pending_p) | |
1194 | status = lp->status_pending; | |
1195 | else | |
1196 | { | |
1197 | /* If the thread had been suspended by gdbserver, and it stopped | |
1198 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1199 | want to deliver that SIGSTOP. */ | |
1200 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1201 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1202 | return 0; |
1203 | ||
1204 | /* Otherwise, we may need to deliver the signal we | |
1205 | intercepted. */ | |
1206 | status = lp->last_status; | |
1207 | } | |
1208 | ||
1209 | if (!WIFSTOPPED (status)) | |
1210 | { | |
1211 | if (debug_threads) | |
87ce2a04 | 1212 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1213 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1214 | return 0; |
1215 | } | |
1216 | ||
1217 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1218 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1219 | { |
1220 | if (debug_threads) | |
87ce2a04 DE |
1221 | debug_printf ("GPS: lwp %s had stopped with extended " |
1222 | "status: no pending signal\n", | |
d86d4aaf | 1223 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1224 | return 0; |
1225 | } | |
1226 | ||
2ea28649 | 1227 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1228 | |
1229 | if (program_signals_p && !program_signals[signo]) | |
1230 | { | |
1231 | if (debug_threads) | |
87ce2a04 | 1232 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1233 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1234 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1235 | return 0; |
1236 | } | |
1237 | else if (!program_signals_p | |
1238 | /* If we have no way to know which signals GDB does not | |
1239 | want to have passed to the program, assume | |
1240 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1241 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1242 | { |
1243 | if (debug_threads) | |
87ce2a04 DE |
1244 | debug_printf ("GPS: lwp %s had signal %s, " |
1245 | "but we don't know if we should pass it. " | |
1246 | "Default to not.\n", | |
d86d4aaf | 1247 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1248 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1249 | return 0; |
1250 | } | |
1251 | else | |
1252 | { | |
1253 | if (debug_threads) | |
87ce2a04 | 1254 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1255 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1256 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1257 | |
1258 | return WSTOPSIG (status); | |
1259 | } | |
1260 | } | |
1261 | ||
95954743 PA |
1262 | static int |
1263 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1264 | { |
1265 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1266 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1267 | int pid = * (int *) args; |
9b224c5e | 1268 | int sig; |
95954743 PA |
1269 | |
1270 | if (ptid_get_pid (entry->id) != pid) | |
1271 | return 0; | |
6ad8ae5c | 1272 | |
9b224c5e | 1273 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1274 | if (lwp->stop_expected) |
ae13219e | 1275 | { |
9b224c5e | 1276 | if (debug_threads) |
87ce2a04 | 1277 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1278 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1279 | |
d86d4aaf | 1280 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1281 | lwp->stop_expected = 0; |
ae13219e DJ |
1282 | } |
1283 | ||
1284 | /* Flush any pending changes to the process's registers. */ | |
d86d4aaf | 1285 | regcache_invalidate_thread (thread); |
ae13219e | 1286 | |
9b224c5e PA |
1287 | /* Pass on any pending signal for this thread. */ |
1288 | sig = get_detach_signal (thread); | |
1289 | ||
ae13219e | 1290 | /* Finally, let it resume. */ |
82bfbe7e PA |
1291 | if (the_low_target.prepare_to_resume != NULL) |
1292 | the_low_target.prepare_to_resume (lwp); | |
d86d4aaf | 1293 | if (ptrace (PTRACE_DETACH, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
b8e1b30e | 1294 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
9b224c5e | 1295 | error (_("Can't detach %s: %s"), |
d86d4aaf | 1296 | target_pid_to_str (ptid_of (thread)), |
9b224c5e | 1297 | strerror (errno)); |
bd99dc85 PA |
1298 | |
1299 | delete_lwp (lwp); | |
95954743 | 1300 | return 0; |
6ad8ae5c DJ |
1301 | } |
1302 | ||
95954743 PA |
1303 | static int |
1304 | linux_detach (int pid) | |
1305 | { | |
1306 | struct process_info *process; | |
1307 | ||
1308 | process = find_process_pid (pid); | |
1309 | if (process == NULL) | |
1310 | return -1; | |
1311 | ||
f9e39928 PA |
1312 | /* Stop all threads before detaching. First, ptrace requires that |
1313 | the thread is stopped to sucessfully detach. Second, thread_db | |
1314 | may need to uninstall thread event breakpoints from memory, which | |
1315 | only works with a stopped process anyway. */ | |
7984d532 | 1316 | stop_all_lwps (0, NULL); |
f9e39928 | 1317 | |
ca5c370d | 1318 | #ifdef USE_THREAD_DB |
8336d594 | 1319 | thread_db_detach (process); |
ca5c370d PA |
1320 | #endif |
1321 | ||
fa593d66 PA |
1322 | /* Stabilize threads (move out of jump pads). */ |
1323 | stabilize_threads (); | |
1324 | ||
95954743 | 1325 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1326 | |
1327 | the_target->mourn (process); | |
f9e39928 PA |
1328 | |
1329 | /* Since we presently can only stop all lwps of all processes, we | |
1330 | need to unstop lwps of other processes. */ | |
7984d532 | 1331 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1332 | return 0; |
1333 | } | |
1334 | ||
1335 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1336 | ||
1337 | static int | |
1338 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1339 | { | |
d86d4aaf DE |
1340 | struct thread_info *thread = (struct thread_info *) entry; |
1341 | struct lwp_info *lwp = get_thread_lwp (thread); | |
f9e39928 PA |
1342 | struct process_info *process = proc; |
1343 | ||
d86d4aaf | 1344 | if (pid_of (thread) == pid_of (process)) |
f9e39928 PA |
1345 | delete_lwp (lwp); |
1346 | ||
dd6953e1 | 1347 | return 0; |
6ad8ae5c DJ |
1348 | } |
1349 | ||
8336d594 PA |
1350 | static void |
1351 | linux_mourn (struct process_info *process) | |
1352 | { | |
1353 | struct process_info_private *priv; | |
1354 | ||
1355 | #ifdef USE_THREAD_DB | |
1356 | thread_db_mourn (process); | |
1357 | #endif | |
1358 | ||
d86d4aaf | 1359 | find_inferior (&all_threads, delete_lwp_callback, process); |
f9e39928 | 1360 | |
8336d594 | 1361 | /* Freeing all private data. */ |
fe978cb0 | 1362 | priv = process->priv; |
8336d594 PA |
1363 | free (priv->arch_private); |
1364 | free (priv); | |
fe978cb0 | 1365 | process->priv = NULL; |
505106cd PA |
1366 | |
1367 | remove_process (process); | |
8336d594 PA |
1368 | } |
1369 | ||
444d6139 | 1370 | static void |
95954743 | 1371 | linux_join (int pid) |
444d6139 | 1372 | { |
444d6139 PA |
1373 | int status, ret; |
1374 | ||
1375 | do { | |
95954743 | 1376 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1377 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1378 | break; | |
1379 | } while (ret != -1 || errno != ECHILD); | |
1380 | } | |
1381 | ||
6ad8ae5c | 1382 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1383 | static int |
95954743 | 1384 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1385 | { |
95954743 PA |
1386 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1387 | ||
1388 | /* We assume we always know if a thread exits. If a whole process | |
1389 | exited but we still haven't been able to report it to GDB, we'll | |
1390 | hold on to the last lwp of the dead process. */ | |
1391 | if (lwp != NULL) | |
1392 | return !lwp->dead; | |
0d62e5e8 DJ |
1393 | else |
1394 | return 0; | |
1395 | } | |
1396 | ||
582511be PA |
1397 | /* Return 1 if this lwp still has an interesting status pending. If |
1398 | not (e.g., it had stopped for a breakpoint that is gone), return | |
1399 | false. */ | |
1400 | ||
1401 | static int | |
1402 | thread_still_has_status_pending_p (struct thread_info *thread) | |
1403 | { | |
1404 | struct lwp_info *lp = get_thread_lwp (thread); | |
1405 | ||
1406 | if (!lp->status_pending_p) | |
1407 | return 0; | |
1408 | ||
1409 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1410 | report any status pending the LWP may have. */ | |
1411 | if (thread->last_resume_kind == resume_stop | |
1412 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
1413 | return 0; | |
1414 | ||
1415 | if (thread->last_resume_kind != resume_stop | |
15c66dd6 PA |
1416 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1417 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1418 | { |
1419 | struct thread_info *saved_thread; | |
1420 | CORE_ADDR pc; | |
1421 | int discard = 0; | |
1422 | ||
1423 | gdb_assert (lp->last_status != 0); | |
1424 | ||
1425 | pc = get_pc (lp); | |
1426 | ||
1427 | saved_thread = current_thread; | |
1428 | current_thread = thread; | |
1429 | ||
1430 | if (pc != lp->stop_pc) | |
1431 | { | |
1432 | if (debug_threads) | |
1433 | debug_printf ("PC of %ld changed\n", | |
1434 | lwpid_of (thread)); | |
1435 | discard = 1; | |
1436 | } | |
3e572f71 PA |
1437 | |
1438 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1439 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
582511be PA |
1440 | && !(*the_low_target.breakpoint_at) (pc)) |
1441 | { | |
1442 | if (debug_threads) | |
1443 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1444 | lwpid_of (thread)); | |
1445 | discard = 1; | |
1446 | } | |
15c66dd6 | 1447 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1448 | && !hardware_breakpoint_inserted_here (pc)) |
1449 | { | |
1450 | if (debug_threads) | |
1451 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1452 | lwpid_of (thread)); | |
1453 | discard = 1; | |
1454 | } | |
3e572f71 | 1455 | #endif |
582511be PA |
1456 | |
1457 | current_thread = saved_thread; | |
1458 | ||
1459 | if (discard) | |
1460 | { | |
1461 | if (debug_threads) | |
1462 | debug_printf ("discarding pending breakpoint status\n"); | |
1463 | lp->status_pending_p = 0; | |
1464 | return 0; | |
1465 | } | |
1466 | } | |
1467 | ||
1468 | return 1; | |
1469 | } | |
1470 | ||
6bf5e0ba | 1471 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1472 | static int |
d50171e4 | 1473 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1474 | { |
d86d4aaf | 1475 | struct thread_info *thread = (struct thread_info *) entry; |
582511be | 1476 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1477 | ptid_t ptid = * (ptid_t *) arg; |
1478 | ||
1479 | /* Check if we're only interested in events from a specific process | |
afa8d396 PA |
1480 | or a specific LWP. */ |
1481 | if (!ptid_match (ptid_of (thread), ptid)) | |
95954743 | 1482 | return 0; |
0d62e5e8 | 1483 | |
582511be PA |
1484 | if (lp->status_pending_p |
1485 | && !thread_still_has_status_pending_p (thread)) | |
1486 | { | |
1487 | linux_resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); | |
1488 | return 0; | |
1489 | } | |
0d62e5e8 | 1490 | |
582511be | 1491 | return lp->status_pending_p; |
0d62e5e8 DJ |
1492 | } |
1493 | ||
95954743 PA |
1494 | static int |
1495 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1496 | { | |
1497 | ptid_t ptid = *(ptid_t *) data; | |
1498 | int lwp; | |
1499 | ||
1500 | if (ptid_get_lwp (ptid) != 0) | |
1501 | lwp = ptid_get_lwp (ptid); | |
1502 | else | |
1503 | lwp = ptid_get_pid (ptid); | |
1504 | ||
1505 | if (ptid_get_lwp (entry->id) == lwp) | |
1506 | return 1; | |
1507 | ||
1508 | return 0; | |
1509 | } | |
1510 | ||
1511 | struct lwp_info * | |
1512 | find_lwp_pid (ptid_t ptid) | |
1513 | { | |
d86d4aaf DE |
1514 | struct inferior_list_entry *thread |
1515 | = find_inferior (&all_threads, same_lwp, &ptid); | |
1516 | ||
1517 | if (thread == NULL) | |
1518 | return NULL; | |
1519 | ||
1520 | return get_thread_lwp ((struct thread_info *) thread); | |
95954743 PA |
1521 | } |
1522 | ||
fa96cb38 | 1523 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1524 | |
fa96cb38 PA |
1525 | static int |
1526 | num_lwps (int pid) | |
1527 | { | |
1528 | struct inferior_list_entry *inf, *tmp; | |
1529 | int count = 0; | |
0d62e5e8 | 1530 | |
fa96cb38 | 1531 | ALL_INFERIORS (&all_threads, inf, tmp) |
24a09b5f | 1532 | { |
fa96cb38 PA |
1533 | if (ptid_get_pid (inf->id) == pid) |
1534 | count++; | |
24a09b5f | 1535 | } |
3aee8918 | 1536 | |
fa96cb38 PA |
1537 | return count; |
1538 | } | |
d61ddec4 | 1539 | |
6d4ee8c6 GB |
1540 | /* The arguments passed to iterate_over_lwps. */ |
1541 | ||
1542 | struct iterate_over_lwps_args | |
1543 | { | |
1544 | /* The FILTER argument passed to iterate_over_lwps. */ | |
1545 | ptid_t filter; | |
1546 | ||
1547 | /* The CALLBACK argument passed to iterate_over_lwps. */ | |
1548 | iterate_over_lwps_ftype *callback; | |
1549 | ||
1550 | /* The DATA argument passed to iterate_over_lwps. */ | |
1551 | void *data; | |
1552 | }; | |
1553 | ||
1554 | /* Callback for find_inferior used by iterate_over_lwps to filter | |
1555 | calls to the callback supplied to that function. Returning a | |
1556 | nonzero value causes find_inferiors to stop iterating and return | |
1557 | the current inferior_list_entry. Returning zero indicates that | |
1558 | find_inferiors should continue iterating. */ | |
1559 | ||
1560 | static int | |
1561 | iterate_over_lwps_filter (struct inferior_list_entry *entry, void *args_p) | |
1562 | { | |
1563 | struct iterate_over_lwps_args *args | |
1564 | = (struct iterate_over_lwps_args *) args_p; | |
1565 | ||
1566 | if (ptid_match (entry->id, args->filter)) | |
1567 | { | |
1568 | struct thread_info *thr = (struct thread_info *) entry; | |
1569 | struct lwp_info *lwp = get_thread_lwp (thr); | |
1570 | ||
1571 | return (*args->callback) (lwp, args->data); | |
1572 | } | |
1573 | ||
1574 | return 0; | |
1575 | } | |
1576 | ||
1577 | /* See nat/linux-nat.h. */ | |
1578 | ||
1579 | struct lwp_info * | |
1580 | iterate_over_lwps (ptid_t filter, | |
1581 | iterate_over_lwps_ftype callback, | |
1582 | void *data) | |
1583 | { | |
1584 | struct iterate_over_lwps_args args = {filter, callback, data}; | |
1585 | struct inferior_list_entry *entry; | |
1586 | ||
1587 | entry = find_inferior (&all_threads, iterate_over_lwps_filter, &args); | |
1588 | if (entry == NULL) | |
1589 | return NULL; | |
1590 | ||
1591 | return get_thread_lwp ((struct thread_info *) entry); | |
1592 | } | |
1593 | ||
fa96cb38 PA |
1594 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1595 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1596 | |
fa96cb38 PA |
1597 | static void |
1598 | check_zombie_leaders (void) | |
1599 | { | |
1600 | struct process_info *proc, *tmp; | |
c3adc08c | 1601 | |
fa96cb38 | 1602 | ALL_PROCESSES (proc, tmp) |
c3adc08c | 1603 | { |
fa96cb38 PA |
1604 | pid_t leader_pid = pid_of (proc); |
1605 | struct lwp_info *leader_lp; | |
c3adc08c | 1606 | |
fa96cb38 | 1607 | leader_lp = find_lwp_pid (pid_to_ptid (leader_pid)); |
c3adc08c | 1608 | |
fa96cb38 PA |
1609 | if (debug_threads) |
1610 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1611 | "num_lwps=%d, zombie=%d\n", | |
1612 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1613 | linux_proc_pid_is_zombie (leader_pid)); | |
1614 | ||
1615 | if (leader_lp != NULL | |
1616 | /* Check if there are other threads in the group, as we may | |
1617 | have raced with the inferior simply exiting. */ | |
1618 | && !last_thread_of_process_p (leader_pid) | |
1619 | && linux_proc_pid_is_zombie (leader_pid)) | |
1620 | { | |
1621 | /* A leader zombie can mean one of two things: | |
1622 | ||
1623 | - It exited, and there's an exit status pending | |
1624 | available, or only the leader exited (not the whole | |
1625 | program). In the latter case, we can't waitpid the | |
1626 | leader's exit status until all other threads are gone. | |
1627 | ||
1628 | - There are 3 or more threads in the group, and a thread | |
1629 | other than the leader exec'd. On an exec, the Linux | |
1630 | kernel destroys all other threads (except the execing | |
1631 | one) in the thread group, and resets the execing thread's | |
1632 | tid to the tgid. No exit notification is sent for the | |
1633 | execing thread -- from the ptracer's perspective, it | |
1634 | appears as though the execing thread just vanishes. | |
1635 | Until we reap all other threads except the leader and the | |
1636 | execing thread, the leader will be zombie, and the | |
1637 | execing thread will be in `D (disc sleep)'. As soon as | |
1638 | all other threads are reaped, the execing thread changes | |
1639 | it's tid to the tgid, and the previous (zombie) leader | |
1640 | vanishes, giving place to the "new" leader. We could try | |
1641 | distinguishing the exit and exec cases, by waiting once | |
1642 | more, and seeing if something comes out, but it doesn't | |
1643 | sound useful. The previous leader _does_ go away, and | |
1644 | we'll re-add the new one once we see the exec event | |
1645 | (which is just the same as what would happen if the | |
1646 | previous leader did exit voluntarily before some other | |
1647 | thread execs). */ | |
c3adc08c | 1648 | |
fa96cb38 PA |
1649 | if (debug_threads) |
1650 | fprintf (stderr, | |
1651 | "CZL: Thread group leader %d zombie " | |
1652 | "(it exited, or another thread execd).\n", | |
1653 | leader_pid); | |
c3adc08c | 1654 | |
fa96cb38 | 1655 | delete_lwp (leader_lp); |
c3adc08c PA |
1656 | } |
1657 | } | |
fa96cb38 | 1658 | } |
c3adc08c | 1659 | |
fa96cb38 PA |
1660 | /* Callback for `find_inferior'. Returns the first LWP that is not |
1661 | stopped. ARG is a PTID filter. */ | |
d50171e4 | 1662 | |
fa96cb38 PA |
1663 | static int |
1664 | not_stopped_callback (struct inferior_list_entry *entry, void *arg) | |
1665 | { | |
1666 | struct thread_info *thr = (struct thread_info *) entry; | |
1667 | struct lwp_info *lwp; | |
1668 | ptid_t filter = *(ptid_t *) arg; | |
47c0c975 | 1669 | |
fa96cb38 PA |
1670 | if (!ptid_match (ptid_of (thr), filter)) |
1671 | return 0; | |
bd99dc85 | 1672 | |
fa96cb38 PA |
1673 | lwp = get_thread_lwp (thr); |
1674 | if (!lwp->stopped) | |
1675 | return 1; | |
1676 | ||
1677 | return 0; | |
0d62e5e8 | 1678 | } |
611cb4a5 | 1679 | |
219f2f23 PA |
1680 | /* This function should only be called if the LWP got a SIGTRAP. |
1681 | ||
1682 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1683 | event was handled, 0 otherwise. */ | |
1684 | ||
1685 | static int | |
1686 | handle_tracepoints (struct lwp_info *lwp) | |
1687 | { | |
1688 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1689 | int tpoint_related_event = 0; | |
1690 | ||
582511be PA |
1691 | gdb_assert (lwp->suspended == 0); |
1692 | ||
7984d532 PA |
1693 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1694 | uninsert tracepoints. To do this, we temporarily pause all | |
1695 | threads, unpatch away, and then unpause threads. We need to make | |
1696 | sure the unpausing doesn't resume LWP too. */ | |
1697 | lwp->suspended++; | |
1698 | ||
219f2f23 PA |
1699 | /* And we need to be sure that any all-threads-stopping doesn't try |
1700 | to move threads out of the jump pads, as it could deadlock the | |
1701 | inferior (LWP could be in the jump pad, maybe even holding the | |
1702 | lock.) */ | |
1703 | ||
1704 | /* Do any necessary step collect actions. */ | |
1705 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1706 | ||
fa593d66 PA |
1707 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1708 | ||
219f2f23 PA |
1709 | /* See if we just hit a tracepoint and do its main collect |
1710 | actions. */ | |
1711 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1712 | ||
7984d532 PA |
1713 | lwp->suspended--; |
1714 | ||
1715 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1716 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1717 | |
219f2f23 PA |
1718 | if (tpoint_related_event) |
1719 | { | |
1720 | if (debug_threads) | |
87ce2a04 | 1721 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1722 | return 1; |
1723 | } | |
1724 | ||
1725 | return 0; | |
1726 | } | |
1727 | ||
fa593d66 PA |
1728 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1729 | fast tracepoint. */ | |
1730 | ||
1731 | static int | |
1732 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1733 | struct fast_tpoint_collect_status *status) | |
1734 | { | |
1735 | CORE_ADDR thread_area; | |
d86d4aaf | 1736 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1737 | |
1738 | if (the_low_target.get_thread_area == NULL) | |
1739 | return 0; | |
1740 | ||
1741 | /* Get the thread area address. This is used to recognize which | |
1742 | thread is which when tracing with the in-process agent library. | |
1743 | We don't read anything from the address, and treat it as opaque; | |
1744 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 1745 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
fa593d66 PA |
1746 | return 0; |
1747 | ||
1748 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1749 | } | |
1750 | ||
1751 | /* The reason we resume in the caller, is because we want to be able | |
1752 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1753 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1754 | refuses to resume. */ | |
1755 | ||
1756 | static int | |
1757 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1758 | { | |
0bfdf32f | 1759 | struct thread_info *saved_thread; |
fa593d66 | 1760 | |
0bfdf32f GB |
1761 | saved_thread = current_thread; |
1762 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
1763 | |
1764 | if ((wstat == NULL | |
1765 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1766 | && supports_fast_tracepoints () | |
58b4daa5 | 1767 | && agent_loaded_p ()) |
fa593d66 PA |
1768 | { |
1769 | struct fast_tpoint_collect_status status; | |
1770 | int r; | |
1771 | ||
1772 | if (debug_threads) | |
87ce2a04 DE |
1773 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1774 | "jump pad.\n", | |
0bfdf32f | 1775 | lwpid_of (current_thread)); |
fa593d66 PA |
1776 | |
1777 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1778 | ||
1779 | if (wstat == NULL | |
1780 | || (WSTOPSIG (*wstat) != SIGILL | |
1781 | && WSTOPSIG (*wstat) != SIGFPE | |
1782 | && WSTOPSIG (*wstat) != SIGSEGV | |
1783 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1784 | { | |
1785 | lwp->collecting_fast_tracepoint = r; | |
1786 | ||
1787 | if (r != 0) | |
1788 | { | |
1789 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1790 | { | |
1791 | /* Haven't executed the original instruction yet. | |
1792 | Set breakpoint there, and wait till it's hit, | |
1793 | then single-step until exiting the jump pad. */ | |
1794 | lwp->exit_jump_pad_bkpt | |
1795 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1796 | } | |
1797 | ||
1798 | if (debug_threads) | |
87ce2a04 DE |
1799 | debug_printf ("Checking whether LWP %ld needs to move out of " |
1800 | "the jump pad...it does\n", | |
0bfdf32f GB |
1801 | lwpid_of (current_thread)); |
1802 | current_thread = saved_thread; | |
fa593d66 PA |
1803 | |
1804 | return 1; | |
1805 | } | |
1806 | } | |
1807 | else | |
1808 | { | |
1809 | /* If we get a synchronous signal while collecting, *and* | |
1810 | while executing the (relocated) original instruction, | |
1811 | reset the PC to point at the tpoint address, before | |
1812 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1813 | report the signal to GDB, and pray for the best. */ | |
1814 | ||
1815 | lwp->collecting_fast_tracepoint = 0; | |
1816 | ||
1817 | if (r != 0 | |
1818 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1819 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1820 | { | |
1821 | siginfo_t info; | |
1822 | struct regcache *regcache; | |
1823 | ||
1824 | /* The si_addr on a few signals references the address | |
1825 | of the faulting instruction. Adjust that as | |
1826 | well. */ | |
1827 | if ((WSTOPSIG (*wstat) == SIGILL | |
1828 | || WSTOPSIG (*wstat) == SIGFPE | |
1829 | || WSTOPSIG (*wstat) == SIGBUS | |
1830 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 1831 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1832 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
1833 | /* Final check just to make sure we don't clobber |
1834 | the siginfo of non-kernel-sent signals. */ | |
1835 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1836 | { | |
1837 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 1838 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1839 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
1840 | } |
1841 | ||
0bfdf32f | 1842 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
1843 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
1844 | lwp->stop_pc = status.tpoint_addr; | |
1845 | ||
1846 | /* Cancel any fast tracepoint lock this thread was | |
1847 | holding. */ | |
1848 | force_unlock_trace_buffer (); | |
1849 | } | |
1850 | ||
1851 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1852 | { | |
1853 | if (debug_threads) | |
87ce2a04 DE |
1854 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
1855 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
1856 | |
1857 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
1858 | |
1859 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1860 | lwp->exit_jump_pad_bkpt = NULL; | |
1861 | ||
1862 | unstop_all_lwps (1, lwp); | |
1863 | ||
1864 | gdb_assert (lwp->suspended >= 0); | |
1865 | } | |
1866 | } | |
1867 | } | |
1868 | ||
1869 | if (debug_threads) | |
87ce2a04 DE |
1870 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1871 | "jump pad...no\n", | |
0bfdf32f | 1872 | lwpid_of (current_thread)); |
0cccb683 | 1873 | |
0bfdf32f | 1874 | current_thread = saved_thread; |
fa593d66 PA |
1875 | return 0; |
1876 | } | |
1877 | ||
1878 | /* Enqueue one signal in the "signals to report later when out of the | |
1879 | jump pad" list. */ | |
1880 | ||
1881 | static void | |
1882 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1883 | { | |
1884 | struct pending_signals *p_sig; | |
d86d4aaf | 1885 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1886 | |
1887 | if (debug_threads) | |
87ce2a04 | 1888 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 1889 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1890 | |
1891 | if (debug_threads) | |
1892 | { | |
1893 | struct pending_signals *sig; | |
1894 | ||
1895 | for (sig = lwp->pending_signals_to_report; | |
1896 | sig != NULL; | |
1897 | sig = sig->prev) | |
87ce2a04 DE |
1898 | debug_printf (" Already queued %d\n", |
1899 | sig->signal); | |
fa593d66 | 1900 | |
87ce2a04 | 1901 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
1902 | } |
1903 | ||
1a981360 PA |
1904 | /* Don't enqueue non-RT signals if they are already in the deferred |
1905 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1906 | twice) */ | |
1907 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1908 | { | |
1909 | struct pending_signals *sig; | |
1910 | ||
1911 | for (sig = lwp->pending_signals_to_report; | |
1912 | sig != NULL; | |
1913 | sig = sig->prev) | |
1914 | { | |
1915 | if (sig->signal == WSTOPSIG (*wstat)) | |
1916 | { | |
1917 | if (debug_threads) | |
87ce2a04 DE |
1918 | debug_printf ("Not requeuing already queued non-RT signal %d" |
1919 | " for LWP %ld\n", | |
1920 | sig->signal, | |
d86d4aaf | 1921 | lwpid_of (thread)); |
1a981360 PA |
1922 | return; |
1923 | } | |
1924 | } | |
1925 | } | |
1926 | ||
fa593d66 PA |
1927 | p_sig = xmalloc (sizeof (*p_sig)); |
1928 | p_sig->prev = lwp->pending_signals_to_report; | |
1929 | p_sig->signal = WSTOPSIG (*wstat); | |
1930 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
d86d4aaf | 1931 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1932 | &p_sig->info); |
fa593d66 PA |
1933 | |
1934 | lwp->pending_signals_to_report = p_sig; | |
1935 | } | |
1936 | ||
1937 | /* Dequeue one signal from the "signals to report later when out of | |
1938 | the jump pad" list. */ | |
1939 | ||
1940 | static int | |
1941 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1942 | { | |
d86d4aaf DE |
1943 | struct thread_info *thread = get_lwp_thread (lwp); |
1944 | ||
fa593d66 PA |
1945 | if (lwp->pending_signals_to_report != NULL) |
1946 | { | |
1947 | struct pending_signals **p_sig; | |
1948 | ||
1949 | p_sig = &lwp->pending_signals_to_report; | |
1950 | while ((*p_sig)->prev != NULL) | |
1951 | p_sig = &(*p_sig)->prev; | |
1952 | ||
1953 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1954 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 1955 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1956 | &(*p_sig)->info); |
fa593d66 PA |
1957 | free (*p_sig); |
1958 | *p_sig = NULL; | |
1959 | ||
1960 | if (debug_threads) | |
87ce2a04 | 1961 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 1962 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1963 | |
1964 | if (debug_threads) | |
1965 | { | |
1966 | struct pending_signals *sig; | |
1967 | ||
1968 | for (sig = lwp->pending_signals_to_report; | |
1969 | sig != NULL; | |
1970 | sig = sig->prev) | |
87ce2a04 DE |
1971 | debug_printf (" Still queued %d\n", |
1972 | sig->signal); | |
fa593d66 | 1973 | |
87ce2a04 | 1974 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
1975 | } |
1976 | ||
1977 | return 1; | |
1978 | } | |
1979 | ||
1980 | return 0; | |
1981 | } | |
1982 | ||
582511be PA |
1983 | /* Fetch the possibly triggered data watchpoint info and store it in |
1984 | CHILD. | |
d50171e4 | 1985 | |
582511be PA |
1986 | On some archs, like x86, that use debug registers to set |
1987 | watchpoints, it's possible that the way to know which watched | |
1988 | address trapped, is to check the register that is used to select | |
1989 | which address to watch. Problem is, between setting the watchpoint | |
1990 | and reading back which data address trapped, the user may change | |
1991 | the set of watchpoints, and, as a consequence, GDB changes the | |
1992 | debug registers in the inferior. To avoid reading back a stale | |
1993 | stopped-data-address when that happens, we cache in LP the fact | |
1994 | that a watchpoint trapped, and the corresponding data address, as | |
1995 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
1996 | registers meanwhile, we have the cached data we can rely on. */ | |
d50171e4 | 1997 | |
582511be PA |
1998 | static int |
1999 | check_stopped_by_watchpoint (struct lwp_info *child) | |
2000 | { | |
2001 | if (the_low_target.stopped_by_watchpoint != NULL) | |
d50171e4 | 2002 | { |
582511be | 2003 | struct thread_info *saved_thread; |
d50171e4 | 2004 | |
582511be PA |
2005 | saved_thread = current_thread; |
2006 | current_thread = get_lwp_thread (child); | |
2007 | ||
2008 | if (the_low_target.stopped_by_watchpoint ()) | |
d50171e4 | 2009 | { |
15c66dd6 | 2010 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; |
582511be PA |
2011 | |
2012 | if (the_low_target.stopped_data_address != NULL) | |
2013 | child->stopped_data_address | |
2014 | = the_low_target.stopped_data_address (); | |
2015 | else | |
2016 | child->stopped_data_address = 0; | |
d50171e4 PA |
2017 | } |
2018 | ||
0bfdf32f | 2019 | current_thread = saved_thread; |
d50171e4 PA |
2020 | } |
2021 | ||
15c66dd6 | 2022 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
c4d9ceb6 YQ |
2023 | } |
2024 | ||
de0d863e DB |
2025 | /* Return the ptrace options that we want to try to enable. */ |
2026 | ||
2027 | static int | |
2028 | linux_low_ptrace_options (int attached) | |
2029 | { | |
2030 | int options = 0; | |
2031 | ||
2032 | if (!attached) | |
2033 | options |= PTRACE_O_EXITKILL; | |
2034 | ||
2035 | if (report_fork_events) | |
2036 | options |= PTRACE_O_TRACEFORK; | |
2037 | ||
c269dbdb DB |
2038 | if (report_vfork_events) |
2039 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); | |
2040 | ||
de0d863e DB |
2041 | return options; |
2042 | } | |
2043 | ||
fa96cb38 PA |
2044 | /* Do low-level handling of the event, and check if we should go on |
2045 | and pass it to caller code. Return the affected lwp if we are, or | |
2046 | NULL otherwise. */ | |
2047 | ||
2048 | static struct lwp_info * | |
582511be | 2049 | linux_low_filter_event (int lwpid, int wstat) |
fa96cb38 PA |
2050 | { |
2051 | struct lwp_info *child; | |
2052 | struct thread_info *thread; | |
582511be | 2053 | int have_stop_pc = 0; |
fa96cb38 PA |
2054 | |
2055 | child = find_lwp_pid (pid_to_ptid (lwpid)); | |
2056 | ||
2057 | /* If we didn't find a process, one of two things presumably happened: | |
2058 | - A process we started and then detached from has exited. Ignore it. | |
2059 | - A process we are controlling has forked and the new child's stop | |
2060 | was reported to us by the kernel. Save its PID. */ | |
2061 | if (child == NULL && WIFSTOPPED (wstat)) | |
2062 | { | |
2063 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2064 | return NULL; | |
2065 | } | |
2066 | else if (child == NULL) | |
2067 | return NULL; | |
2068 | ||
2069 | thread = get_lwp_thread (child); | |
2070 | ||
2071 | child->stopped = 1; | |
2072 | ||
2073 | child->last_status = wstat; | |
2074 | ||
582511be PA |
2075 | /* Check if the thread has exited. */ |
2076 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2077 | { | |
2078 | if (debug_threads) | |
2079 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
2080 | if (num_lwps (pid_of (thread)) > 1) | |
2081 | { | |
2082 | ||
2083 | /* If there is at least one more LWP, then the exit signal was | |
2084 | not the end of the debugged application and should be | |
2085 | ignored. */ | |
2086 | delete_lwp (child); | |
2087 | return NULL; | |
2088 | } | |
2089 | else | |
2090 | { | |
2091 | /* This was the last lwp in the process. Since events are | |
2092 | serialized to GDB core, and we can't report this one | |
2093 | right now, but GDB core and the other target layers will | |
2094 | want to be notified about the exit code/signal, leave the | |
2095 | status pending for the next time we're able to report | |
2096 | it. */ | |
2097 | mark_lwp_dead (child, wstat); | |
2098 | return child; | |
2099 | } | |
2100 | } | |
2101 | ||
2102 | gdb_assert (WIFSTOPPED (wstat)); | |
2103 | ||
fa96cb38 PA |
2104 | if (WIFSTOPPED (wstat)) |
2105 | { | |
2106 | struct process_info *proc; | |
2107 | ||
2108 | /* Architecture-specific setup after inferior is running. This | |
2109 | needs to happen after we have attached to the inferior and it | |
2110 | is stopped for the first time, but before we access any | |
2111 | inferior registers. */ | |
2112 | proc = find_process_pid (pid_of (thread)); | |
fe978cb0 | 2113 | if (proc->priv->new_inferior) |
fa96cb38 | 2114 | { |
0bfdf32f | 2115 | struct thread_info *saved_thread; |
fa96cb38 | 2116 | |
0bfdf32f GB |
2117 | saved_thread = current_thread; |
2118 | current_thread = thread; | |
fa96cb38 PA |
2119 | |
2120 | the_low_target.arch_setup (); | |
2121 | ||
0bfdf32f | 2122 | current_thread = saved_thread; |
fa96cb38 | 2123 | |
fe978cb0 | 2124 | proc->priv->new_inferior = 0; |
fa96cb38 PA |
2125 | } |
2126 | } | |
2127 | ||
fa96cb38 PA |
2128 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2129 | { | |
beed38b8 | 2130 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2131 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2132 | |
de0d863e | 2133 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2134 | child->must_set_ptrace_flags = 0; |
2135 | } | |
2136 | ||
582511be PA |
2137 | /* Be careful to not overwrite stop_pc until |
2138 | check_stopped_by_breakpoint is called. */ | |
fa96cb38 | 2139 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2140 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2141 | { |
582511be | 2142 | child->stop_pc = get_pc (child); |
de0d863e DB |
2143 | if (handle_extended_wait (child, wstat)) |
2144 | { | |
2145 | /* The event has been handled, so just return without | |
2146 | reporting it. */ | |
2147 | return NULL; | |
2148 | } | |
fa96cb38 PA |
2149 | } |
2150 | ||
3e572f71 PA |
2151 | /* Check first whether this was a SW/HW breakpoint before checking |
2152 | watchpoints, because at least s390 can't tell the data address of | |
2153 | hardware watchpoint hits, and returns stopped-by-watchpoint as | |
2154 | long as there's a watchpoint set. */ | |
2155 | if (WIFSTOPPED (wstat) && linux_wstatus_maybe_breakpoint (wstat)) | |
582511be PA |
2156 | { |
2157 | if (check_stopped_by_breakpoint (child)) | |
2158 | have_stop_pc = 1; | |
2159 | } | |
2160 | ||
3e572f71 PA |
2161 | /* Note that TRAP_HWBKPT can indicate either a hardware breakpoint |
2162 | or hardware watchpoint. Check which is which if we got | |
2163 | TARGET_STOPPED_BY_HW_BREAKPOINT. */ | |
2164 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP | |
2165 | && (child->stop_reason == TARGET_STOPPED_BY_NO_REASON | |
2166 | || child->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
2167 | check_stopped_by_watchpoint (child); | |
2168 | ||
582511be PA |
2169 | if (!have_stop_pc) |
2170 | child->stop_pc = get_pc (child); | |
2171 | ||
fa96cb38 PA |
2172 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2173 | && child->stop_expected) | |
2174 | { | |
2175 | if (debug_threads) | |
2176 | debug_printf ("Expected stop.\n"); | |
2177 | child->stop_expected = 0; | |
2178 | ||
2179 | if (thread->last_resume_kind == resume_stop) | |
2180 | { | |
2181 | /* We want to report the stop to the core. Treat the | |
2182 | SIGSTOP as a normal event. */ | |
2bf6fb9d PA |
2183 | if (debug_threads) |
2184 | debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n", | |
2185 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2186 | } |
2187 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2188 | { | |
2189 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2190 | pending. */ |
2bf6fb9d PA |
2191 | if (debug_threads) |
2192 | debug_printf ("LLW: SIGSTOP caught for %s " | |
2193 | "while stopping threads.\n", | |
2194 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2195 | return NULL; |
2196 | } | |
2197 | else | |
2198 | { | |
2bf6fb9d PA |
2199 | /* This is a delayed SIGSTOP. Filter out the event. */ |
2200 | if (debug_threads) | |
2201 | debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", | |
2202 | child->stepping ? "step" : "continue", | |
2203 | target_pid_to_str (ptid_of (thread))); | |
2204 | ||
fa96cb38 PA |
2205 | linux_resume_one_lwp (child, child->stepping, 0, NULL); |
2206 | return NULL; | |
2207 | } | |
2208 | } | |
2209 | ||
582511be PA |
2210 | child->status_pending_p = 1; |
2211 | child->status_pending = wstat; | |
fa96cb38 PA |
2212 | return child; |
2213 | } | |
2214 | ||
20ba1ce6 PA |
2215 | /* Resume LWPs that are currently stopped without any pending status |
2216 | to report, but are resumed from the core's perspective. */ | |
2217 | ||
2218 | static void | |
2219 | resume_stopped_resumed_lwps (struct inferior_list_entry *entry) | |
2220 | { | |
2221 | struct thread_info *thread = (struct thread_info *) entry; | |
2222 | struct lwp_info *lp = get_thread_lwp (thread); | |
2223 | ||
2224 | if (lp->stopped | |
2225 | && !lp->status_pending_p | |
2226 | && thread->last_resume_kind != resume_stop | |
2227 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
2228 | { | |
2229 | int step = thread->last_resume_kind == resume_step; | |
2230 | ||
2231 | if (debug_threads) | |
2232 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2233 | target_pid_to_str (ptid_of (thread)), | |
2234 | paddress (lp->stop_pc), | |
2235 | step); | |
2236 | ||
2237 | linux_resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); | |
2238 | } | |
2239 | } | |
2240 | ||
fa96cb38 PA |
2241 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
2242 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
2243 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2244 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2245 | the stop status through the status pointer WSTAT. OPTIONS is | |
2246 | passed to the waitpid call. Return 0 if no event was found and | |
2247 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2248 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 2249 | |
0d62e5e8 | 2250 | static int |
fa96cb38 PA |
2251 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
2252 | int *wstatp, int options) | |
0d62e5e8 | 2253 | { |
d86d4aaf | 2254 | struct thread_info *event_thread; |
d50171e4 | 2255 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2256 | sigset_t block_mask, prev_mask; |
d50171e4 | 2257 | |
fa96cb38 | 2258 | retry: |
d86d4aaf DE |
2259 | /* N.B. event_thread points to the thread_info struct that contains |
2260 | event_child. Keep them in sync. */ | |
2261 | event_thread = NULL; | |
d50171e4 PA |
2262 | event_child = NULL; |
2263 | requested_child = NULL; | |
0d62e5e8 | 2264 | |
95954743 | 2265 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2266 | |
fa96cb38 | 2267 | if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid)) |
0d62e5e8 | 2268 | { |
d86d4aaf | 2269 | event_thread = (struct thread_info *) |
fa96cb38 | 2270 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); |
d86d4aaf DE |
2271 | if (event_thread != NULL) |
2272 | event_child = get_thread_lwp (event_thread); | |
2273 | if (debug_threads && event_thread) | |
2274 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2275 | } |
fa96cb38 | 2276 | else if (!ptid_equal (filter_ptid, null_ptid)) |
0d62e5e8 | 2277 | { |
fa96cb38 | 2278 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2279 | |
bde24c0a | 2280 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
2281 | && requested_child->status_pending_p |
2282 | && requested_child->collecting_fast_tracepoint) | |
2283 | { | |
2284 | enqueue_one_deferred_signal (requested_child, | |
2285 | &requested_child->status_pending); | |
2286 | requested_child->status_pending_p = 0; | |
2287 | requested_child->status_pending = 0; | |
2288 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2289 | } | |
2290 | ||
2291 | if (requested_child->suspended | |
2292 | && requested_child->status_pending_p) | |
38e08fca GB |
2293 | { |
2294 | internal_error (__FILE__, __LINE__, | |
2295 | "requesting an event out of a" | |
2296 | " suspended child?"); | |
2297 | } | |
fa593d66 | 2298 | |
d50171e4 | 2299 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2300 | { |
2301 | event_child = requested_child; | |
2302 | event_thread = get_lwp_thread (event_child); | |
2303 | } | |
0d62e5e8 | 2304 | } |
611cb4a5 | 2305 | |
0d62e5e8 DJ |
2306 | if (event_child != NULL) |
2307 | { | |
bd99dc85 | 2308 | if (debug_threads) |
87ce2a04 | 2309 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2310 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2311 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2312 | event_child->status_pending_p = 0; |
2313 | event_child->status_pending = 0; | |
0bfdf32f | 2314 | current_thread = event_thread; |
d86d4aaf | 2315 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2316 | } |
2317 | ||
fa96cb38 PA |
2318 | /* But if we don't find a pending event, we'll have to wait. |
2319 | ||
2320 | We only enter this loop if no process has a pending wait status. | |
2321 | Thus any action taken in response to a wait status inside this | |
2322 | loop is responding as soon as we detect the status, not after any | |
2323 | pending events. */ | |
d8301ad1 | 2324 | |
fa96cb38 PA |
2325 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2326 | all signals while here. */ | |
2327 | sigfillset (&block_mask); | |
2328 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2329 | ||
582511be PA |
2330 | /* Always pull all events out of the kernel. We'll randomly select |
2331 | an event LWP out of all that have events, to prevent | |
2332 | starvation. */ | |
fa96cb38 | 2333 | while (event_child == NULL) |
0d62e5e8 | 2334 | { |
fa96cb38 | 2335 | pid_t ret = 0; |
0d62e5e8 | 2336 | |
fa96cb38 PA |
2337 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2338 | quirks: | |
0d62e5e8 | 2339 | |
fa96cb38 PA |
2340 | - If the thread group leader exits while other threads in the |
2341 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2342 | waitpid won't return an exit status until the other threads | |
2343 | in the group are reaped. | |
611cb4a5 | 2344 | |
fa96cb38 PA |
2345 | - When a non-leader thread execs, that thread just vanishes |
2346 | without reporting an exit (so we'd hang if we waited for it | |
2347 | explicitly in that case). The exec event is reported to | |
2348 | the TGID pid (although we don't currently enable exec | |
2349 | events). */ | |
2350 | errno = 0; | |
2351 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2352 | |
fa96cb38 PA |
2353 | if (debug_threads) |
2354 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2355 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2356 | |
fa96cb38 | 2357 | if (ret > 0) |
0d62e5e8 | 2358 | { |
89be2091 | 2359 | if (debug_threads) |
bd99dc85 | 2360 | { |
fa96cb38 PA |
2361 | debug_printf ("LLW: waitpid %ld received %s\n", |
2362 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2363 | } |
89be2091 | 2364 | |
582511be PA |
2365 | /* Filter all events. IOW, leave all events pending. We'll |
2366 | randomly select an event LWP out of all that have events | |
2367 | below. */ | |
2368 | linux_low_filter_event (ret, *wstatp); | |
fa96cb38 PA |
2369 | /* Retry until nothing comes out of waitpid. A single |
2370 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2371 | continue; |
2372 | } | |
2373 | ||
20ba1ce6 PA |
2374 | /* Now that we've pulled all events out of the kernel, resume |
2375 | LWPs that don't have an interesting event to report. */ | |
2376 | if (stopping_threads == NOT_STOPPING_THREADS) | |
2377 | for_each_inferior (&all_threads, resume_stopped_resumed_lwps); | |
2378 | ||
2379 | /* ... and find an LWP with a status to report to the core, if | |
2380 | any. */ | |
582511be PA |
2381 | event_thread = (struct thread_info *) |
2382 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); | |
2383 | if (event_thread != NULL) | |
2384 | { | |
2385 | event_child = get_thread_lwp (event_thread); | |
2386 | *wstatp = event_child->status_pending; | |
2387 | event_child->status_pending_p = 0; | |
2388 | event_child->status_pending = 0; | |
2389 | break; | |
2390 | } | |
2391 | ||
fa96cb38 PA |
2392 | /* Check for zombie thread group leaders. Those can't be reaped |
2393 | until all other threads in the thread group are. */ | |
2394 | check_zombie_leaders (); | |
2395 | ||
2396 | /* If there are no resumed children left in the set of LWPs we | |
2397 | want to wait for, bail. We can't just block in | |
2398 | waitpid/sigsuspend, because lwps might have been left stopped | |
2399 | in trace-stop state, and we'd be stuck forever waiting for | |
2400 | their status to change (which would only happen if we resumed | |
2401 | them). Even if WNOHANG is set, this return code is preferred | |
2402 | over 0 (below), as it is more detailed. */ | |
2403 | if ((find_inferior (&all_threads, | |
2404 | not_stopped_callback, | |
2405 | &wait_ptid) == NULL)) | |
a6dbe5df | 2406 | { |
fa96cb38 PA |
2407 | if (debug_threads) |
2408 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2409 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2410 | return -1; | |
a6dbe5df PA |
2411 | } |
2412 | ||
fa96cb38 PA |
2413 | /* No interesting event to report to the caller. */ |
2414 | if ((options & WNOHANG)) | |
24a09b5f | 2415 | { |
fa96cb38 PA |
2416 | if (debug_threads) |
2417 | debug_printf ("WNOHANG set, no event found\n"); | |
2418 | ||
2419 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2420 | return 0; | |
24a09b5f DJ |
2421 | } |
2422 | ||
fa96cb38 PA |
2423 | /* Block until we get an event reported with SIGCHLD. */ |
2424 | if (debug_threads) | |
2425 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2426 | |
fa96cb38 PA |
2427 | sigsuspend (&prev_mask); |
2428 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2429 | goto retry; | |
2430 | } | |
d50171e4 | 2431 | |
fa96cb38 | 2432 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2433 | |
0bfdf32f | 2434 | current_thread = event_thread; |
d50171e4 | 2435 | |
fa96cb38 PA |
2436 | /* Check for thread exit. */ |
2437 | if (! WIFSTOPPED (*wstatp)) | |
2438 | { | |
2439 | gdb_assert (last_thread_of_process_p (pid_of (event_thread))); | |
2440 | ||
2441 | if (debug_threads) | |
2442 | debug_printf ("LWP %d is the last lwp of process. " | |
2443 | "Process %ld exiting.\n", | |
2444 | pid_of (event_thread), lwpid_of (event_thread)); | |
d86d4aaf | 2445 | return lwpid_of (event_thread); |
611cb4a5 | 2446 | } |
0d62e5e8 | 2447 | |
fa96cb38 PA |
2448 | return lwpid_of (event_thread); |
2449 | } | |
2450 | ||
2451 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2452 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2453 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2454 | the stop status through the status pointer WSTAT. OPTIONS is | |
2455 | passed to the waitpid call. Return 0 if no event was found and | |
2456 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2457 | was found. Return the PID of the stopped child otherwise. */ | |
2458 | ||
2459 | static int | |
2460 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2461 | { | |
2462 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2463 | } |
2464 | ||
6bf5e0ba PA |
2465 | /* Count the LWP's that have had events. */ |
2466 | ||
2467 | static int | |
2468 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2469 | { | |
d86d4aaf | 2470 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2471 | struct lwp_info *lp = get_thread_lwp (thread); |
6bf5e0ba PA |
2472 | int *count = data; |
2473 | ||
2474 | gdb_assert (count != NULL); | |
2475 | ||
582511be | 2476 | /* Count only resumed LWPs that have an event pending. */ |
8336d594 | 2477 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2478 | && lp->status_pending_p) |
6bf5e0ba PA |
2479 | (*count)++; |
2480 | ||
2481 | return 0; | |
2482 | } | |
2483 | ||
2484 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2485 | ||
2486 | static int | |
2487 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2488 | { | |
d86d4aaf DE |
2489 | struct thread_info *thread = (struct thread_info *) entry; |
2490 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba | 2491 | |
8336d594 PA |
2492 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2493 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2494 | && lp->status_pending_p) |
2495 | return 1; | |
2496 | else | |
2497 | return 0; | |
2498 | } | |
2499 | ||
b90fc188 | 2500 | /* Select the Nth LWP that has had an event. */ |
6bf5e0ba PA |
2501 | |
2502 | static int | |
2503 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2504 | { | |
d86d4aaf | 2505 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2506 | struct lwp_info *lp = get_thread_lwp (thread); |
6bf5e0ba PA |
2507 | int *selector = data; |
2508 | ||
2509 | gdb_assert (selector != NULL); | |
2510 | ||
582511be | 2511 | /* Select only resumed LWPs that have an event pending. */ |
91baf43f | 2512 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2513 | && lp->status_pending_p) |
6bf5e0ba PA |
2514 | if ((*selector)-- == 0) |
2515 | return 1; | |
2516 | ||
2517 | return 0; | |
2518 | } | |
2519 | ||
6bf5e0ba PA |
2520 | /* Select one LWP out of those that have events pending. */ |
2521 | ||
2522 | static void | |
2523 | select_event_lwp (struct lwp_info **orig_lp) | |
2524 | { | |
2525 | int num_events = 0; | |
2526 | int random_selector; | |
582511be PA |
2527 | struct thread_info *event_thread = NULL; |
2528 | ||
2529 | /* In all-stop, give preference to the LWP that is being | |
2530 | single-stepped. There will be at most one, and it's the LWP that | |
2531 | the core is most interested in. If we didn't do this, then we'd | |
2532 | have to handle pending step SIGTRAPs somehow in case the core | |
2533 | later continues the previously-stepped thread, otherwise we'd | |
2534 | report the pending SIGTRAP, and the core, not having stepped the | |
2535 | thread, wouldn't understand what the trap was for, and therefore | |
2536 | would report it to the user as a random signal. */ | |
2537 | if (!non_stop) | |
6bf5e0ba | 2538 | { |
582511be PA |
2539 | event_thread |
2540 | = (struct thread_info *) find_inferior (&all_threads, | |
2541 | select_singlestep_lwp_callback, | |
2542 | NULL); | |
2543 | if (event_thread != NULL) | |
2544 | { | |
2545 | if (debug_threads) | |
2546 | debug_printf ("SEL: Select single-step %s\n", | |
2547 | target_pid_to_str (ptid_of (event_thread))); | |
2548 | } | |
6bf5e0ba | 2549 | } |
582511be | 2550 | if (event_thread == NULL) |
6bf5e0ba PA |
2551 | { |
2552 | /* No single-stepping LWP. Select one at random, out of those | |
b90fc188 | 2553 | which have had events. */ |
6bf5e0ba | 2554 | |
b90fc188 | 2555 | /* First see how many events we have. */ |
d86d4aaf | 2556 | find_inferior (&all_threads, count_events_callback, &num_events); |
8bf3b159 | 2557 | gdb_assert (num_events > 0); |
6bf5e0ba | 2558 | |
b90fc188 PA |
2559 | /* Now randomly pick a LWP out of those that have had |
2560 | events. */ | |
6bf5e0ba PA |
2561 | random_selector = (int) |
2562 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2563 | ||
2564 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2565 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2566 | num_events, random_selector); | |
6bf5e0ba | 2567 | |
d86d4aaf DE |
2568 | event_thread |
2569 | = (struct thread_info *) find_inferior (&all_threads, | |
2570 | select_event_lwp_callback, | |
2571 | &random_selector); | |
6bf5e0ba PA |
2572 | } |
2573 | ||
d86d4aaf | 2574 | if (event_thread != NULL) |
6bf5e0ba | 2575 | { |
d86d4aaf DE |
2576 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2577 | ||
6bf5e0ba PA |
2578 | /* Switch the event LWP. */ |
2579 | *orig_lp = event_lp; | |
2580 | } | |
2581 | } | |
2582 | ||
7984d532 PA |
2583 | /* Decrement the suspend count of an LWP. */ |
2584 | ||
2585 | static int | |
2586 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2587 | { | |
d86d4aaf DE |
2588 | struct thread_info *thread = (struct thread_info *) entry; |
2589 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
2590 | |
2591 | /* Ignore EXCEPT. */ | |
2592 | if (lwp == except) | |
2593 | return 0; | |
2594 | ||
2595 | lwp->suspended--; | |
2596 | ||
2597 | gdb_assert (lwp->suspended >= 0); | |
2598 | return 0; | |
2599 | } | |
2600 | ||
2601 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2602 | NULL. */ | |
2603 | ||
2604 | static void | |
2605 | unsuspend_all_lwps (struct lwp_info *except) | |
2606 | { | |
d86d4aaf | 2607 | find_inferior (&all_threads, unsuspend_one_lwp, except); |
7984d532 PA |
2608 | } |
2609 | ||
fa593d66 PA |
2610 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2611 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2612 | void *data); | |
2613 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2614 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2615 | struct target_waitstatus *ourstatus, | |
2616 | int target_options); | |
2617 | ||
2618 | /* Stabilize threads (move out of jump pads). | |
2619 | ||
2620 | If a thread is midway collecting a fast tracepoint, we need to | |
2621 | finish the collection and move it out of the jump pad before | |
2622 | reporting the signal. | |
2623 | ||
2624 | This avoids recursion while collecting (when a signal arrives | |
2625 | midway, and the signal handler itself collects), which would trash | |
2626 | the trace buffer. In case the user set a breakpoint in a signal | |
2627 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2628 | Most importantly, there are certain things we can't do safely if | |
2629 | threads are stopped in a jump pad (or in its callee's). For | |
2630 | example: | |
2631 | ||
2632 | - starting a new trace run. A thread still collecting the | |
2633 | previous run, could trash the trace buffer when resumed. The trace | |
2634 | buffer control structures would have been reset but the thread had | |
2635 | no way to tell. The thread could even midway memcpy'ing to the | |
2636 | buffer, which would mean that when resumed, it would clobber the | |
2637 | trace buffer that had been set for a new run. | |
2638 | ||
2639 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2640 | safely. Say you do tstart while a thread is stopped midway while | |
2641 | collecting. When the thread is later resumed, it finishes the | |
2642 | collection, and returns to the jump pad, to execute the original | |
2643 | instruction that was under the tracepoint jump at the time the | |
2644 | older run had been started. If the jump pad had been rewritten | |
2645 | since for something else in the new run, the thread would now | |
2646 | execute the wrong / random instructions. */ | |
2647 | ||
2648 | static void | |
2649 | linux_stabilize_threads (void) | |
2650 | { | |
0bfdf32f | 2651 | struct thread_info *saved_thread; |
d86d4aaf | 2652 | struct thread_info *thread_stuck; |
fa593d66 | 2653 | |
d86d4aaf DE |
2654 | thread_stuck |
2655 | = (struct thread_info *) find_inferior (&all_threads, | |
2656 | stuck_in_jump_pad_callback, | |
2657 | NULL); | |
2658 | if (thread_stuck != NULL) | |
fa593d66 | 2659 | { |
b4d51a55 | 2660 | if (debug_threads) |
87ce2a04 | 2661 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2662 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2663 | return; |
2664 | } | |
2665 | ||
0bfdf32f | 2666 | saved_thread = current_thread; |
fa593d66 PA |
2667 | |
2668 | stabilizing_threads = 1; | |
2669 | ||
2670 | /* Kick 'em all. */ | |
d86d4aaf | 2671 | for_each_inferior (&all_threads, move_out_of_jump_pad_callback); |
fa593d66 PA |
2672 | |
2673 | /* Loop until all are stopped out of the jump pads. */ | |
d86d4aaf | 2674 | while (find_inferior (&all_threads, lwp_running, NULL) != NULL) |
fa593d66 PA |
2675 | { |
2676 | struct target_waitstatus ourstatus; | |
2677 | struct lwp_info *lwp; | |
fa593d66 PA |
2678 | int wstat; |
2679 | ||
2680 | /* Note that we go through the full wait even loop. While | |
2681 | moving threads out of jump pad, we need to be able to step | |
2682 | over internal breakpoints and such. */ | |
32fcada3 | 2683 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2684 | |
2685 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2686 | { | |
0bfdf32f | 2687 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2688 | |
2689 | /* Lock it. */ | |
2690 | lwp->suspended++; | |
2691 | ||
a493e3e2 | 2692 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2693 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2694 | { |
2ea28649 | 2695 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2696 | enqueue_one_deferred_signal (lwp, &wstat); |
2697 | } | |
2698 | } | |
2699 | } | |
2700 | ||
d86d4aaf | 2701 | find_inferior (&all_threads, unsuspend_one_lwp, NULL); |
fa593d66 PA |
2702 | |
2703 | stabilizing_threads = 0; | |
2704 | ||
0bfdf32f | 2705 | current_thread = saved_thread; |
fa593d66 | 2706 | |
b4d51a55 | 2707 | if (debug_threads) |
fa593d66 | 2708 | { |
d86d4aaf DE |
2709 | thread_stuck |
2710 | = (struct thread_info *) find_inferior (&all_threads, | |
2711 | stuck_in_jump_pad_callback, | |
2712 | NULL); | |
2713 | if (thread_stuck != NULL) | |
87ce2a04 | 2714 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2715 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2716 | } |
2717 | } | |
2718 | ||
582511be PA |
2719 | static void async_file_mark (void); |
2720 | ||
2721 | /* Convenience function that is called when the kernel reports an | |
2722 | event that is not passed out to GDB. */ | |
2723 | ||
2724 | static ptid_t | |
2725 | ignore_event (struct target_waitstatus *ourstatus) | |
2726 | { | |
2727 | /* If we got an event, there may still be others, as a single | |
2728 | SIGCHLD can indicate more than one child stopped. This forces | |
2729 | another target_wait call. */ | |
2730 | async_file_mark (); | |
2731 | ||
2732 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2733 | return null_ptid; | |
2734 | } | |
2735 | ||
de0d863e DB |
2736 | /* Return non-zero if WAITSTATUS reflects an extended linux |
2737 | event. Otherwise, return zero. */ | |
2738 | ||
2739 | static int | |
2740 | extended_event_reported (const struct target_waitstatus *waitstatus) | |
2741 | { | |
2742 | if (waitstatus == NULL) | |
2743 | return 0; | |
2744 | ||
c269dbdb DB |
2745 | return (waitstatus->kind == TARGET_WAITKIND_FORKED |
2746 | || waitstatus->kind == TARGET_WAITKIND_VFORKED | |
2747 | || waitstatus->kind == TARGET_WAITKIND_VFORK_DONE); | |
de0d863e DB |
2748 | } |
2749 | ||
0d62e5e8 | 2750 | /* Wait for process, returns status. */ |
da6d8c04 | 2751 | |
95954743 PA |
2752 | static ptid_t |
2753 | linux_wait_1 (ptid_t ptid, | |
2754 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2755 | { |
e5f1222d | 2756 | int w; |
fc7238bb | 2757 | struct lwp_info *event_child; |
bd99dc85 | 2758 | int options; |
bd99dc85 | 2759 | int pid; |
6bf5e0ba PA |
2760 | int step_over_finished; |
2761 | int bp_explains_trap; | |
2762 | int maybe_internal_trap; | |
2763 | int report_to_gdb; | |
219f2f23 | 2764 | int trace_event; |
c2d6af84 | 2765 | int in_step_range; |
bd99dc85 | 2766 | |
87ce2a04 DE |
2767 | if (debug_threads) |
2768 | { | |
2769 | debug_enter (); | |
2770 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
2771 | } | |
2772 | ||
bd99dc85 PA |
2773 | /* Translate generic target options into linux options. */ |
2774 | options = __WALL; | |
2775 | if (target_options & TARGET_WNOHANG) | |
2776 | options |= WNOHANG; | |
0d62e5e8 | 2777 | |
fa593d66 PA |
2778 | bp_explains_trap = 0; |
2779 | trace_event = 0; | |
c2d6af84 | 2780 | in_step_range = 0; |
bd99dc85 PA |
2781 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2782 | ||
6bf5e0ba PA |
2783 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2784 | pid = linux_wait_for_event (ptid, &w, options); | |
2785 | else | |
2786 | { | |
2787 | if (debug_threads) | |
87ce2a04 DE |
2788 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
2789 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
2790 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
2791 | } | |
2792 | ||
fa96cb38 | 2793 | if (pid == 0) |
87ce2a04 | 2794 | { |
fa96cb38 PA |
2795 | gdb_assert (target_options & TARGET_WNOHANG); |
2796 | ||
87ce2a04 DE |
2797 | if (debug_threads) |
2798 | { | |
fa96cb38 PA |
2799 | debug_printf ("linux_wait_1 ret = null_ptid, " |
2800 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
2801 | debug_exit (); |
2802 | } | |
fa96cb38 PA |
2803 | |
2804 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
2805 | return null_ptid; |
2806 | } | |
fa96cb38 PA |
2807 | else if (pid == -1) |
2808 | { | |
2809 | if (debug_threads) | |
2810 | { | |
2811 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
2812 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
2813 | debug_exit (); | |
2814 | } | |
bd99dc85 | 2815 | |
fa96cb38 PA |
2816 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
2817 | return null_ptid; | |
2818 | } | |
0d62e5e8 | 2819 | |
0bfdf32f | 2820 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 2821 | |
fa96cb38 PA |
2822 | /* linux_wait_for_event only returns an exit status for the last |
2823 | child of a process. Report it. */ | |
2824 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 2825 | { |
fa96cb38 | 2826 | if (WIFEXITED (w)) |
0d62e5e8 | 2827 | { |
fa96cb38 PA |
2828 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
2829 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 2830 | |
fa96cb38 | 2831 | if (debug_threads) |
bd99dc85 | 2832 | { |
fa96cb38 PA |
2833 | debug_printf ("linux_wait_1 ret = %s, exited with " |
2834 | "retcode %d\n", | |
0bfdf32f | 2835 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2836 | WEXITSTATUS (w)); |
2837 | debug_exit (); | |
bd99dc85 | 2838 | } |
fa96cb38 PA |
2839 | } |
2840 | else | |
2841 | { | |
2842 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2843 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 2844 | |
fa96cb38 PA |
2845 | if (debug_threads) |
2846 | { | |
2847 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
2848 | "signal %d\n", | |
0bfdf32f | 2849 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2850 | WTERMSIG (w)); |
2851 | debug_exit (); | |
2852 | } | |
0d62e5e8 | 2853 | } |
fa96cb38 | 2854 | |
0bfdf32f | 2855 | return ptid_of (current_thread); |
da6d8c04 DJ |
2856 | } |
2857 | ||
8090aef2 PA |
2858 | /* If step-over executes a breakpoint instruction, it means a |
2859 | gdb/gdbserver breakpoint had been planted on top of a permanent | |
2860 | breakpoint. The PC has been adjusted by | |
2861 | check_stopped_by_breakpoint to point at the breakpoint address. | |
2862 | Advance the PC manually past the breakpoint, otherwise the | |
2863 | program would keep trapping the permanent breakpoint forever. */ | |
2864 | if (!ptid_equal (step_over_bkpt, null_ptid) | |
15c66dd6 | 2865 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) |
8090aef2 | 2866 | { |
9beb7c4e | 2867 | unsigned int increment_pc = the_low_target.breakpoint_len; |
8090aef2 PA |
2868 | |
2869 | if (debug_threads) | |
2870 | { | |
2871 | debug_printf ("step-over for %s executed software breakpoint\n", | |
2872 | target_pid_to_str (ptid_of (current_thread))); | |
2873 | } | |
2874 | ||
2875 | if (increment_pc != 0) | |
2876 | { | |
2877 | struct regcache *regcache | |
2878 | = get_thread_regcache (current_thread, 1); | |
2879 | ||
2880 | event_child->stop_pc += increment_pc; | |
2881 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2882 | ||
2883 | if (!(*the_low_target.breakpoint_at) (event_child->stop_pc)) | |
15c66dd6 | 2884 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
2885 | } |
2886 | } | |
2887 | ||
6bf5e0ba PA |
2888 | /* If this event was not handled before, and is not a SIGTRAP, we |
2889 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2890 | a breakpoint is inserted at the current PC. If this target does | |
2891 | not support internal breakpoints at all, we also report the | |
2892 | SIGTRAP without further processing; it's of no concern to us. */ | |
2893 | maybe_internal_trap | |
2894 | = (supports_breakpoints () | |
2895 | && (WSTOPSIG (w) == SIGTRAP | |
2896 | || ((WSTOPSIG (w) == SIGILL | |
2897 | || WSTOPSIG (w) == SIGSEGV) | |
2898 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2899 | ||
2900 | if (maybe_internal_trap) | |
2901 | { | |
2902 | /* Handle anything that requires bookkeeping before deciding to | |
2903 | report the event or continue waiting. */ | |
2904 | ||
2905 | /* First check if we can explain the SIGTRAP with an internal | |
2906 | breakpoint, or if we should possibly report the event to GDB. | |
2907 | Do this before anything that may remove or insert a | |
2908 | breakpoint. */ | |
2909 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2910 | ||
2911 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2912 | finished. If so, tweak the state machine accordingly, | |
2913 | reinsert breakpoints and delete any reinsert (software | |
2914 | single-step) breakpoints. */ | |
2915 | step_over_finished = finish_step_over (event_child); | |
2916 | ||
2917 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2918 | check_breakpoints (event_child->stop_pc); | |
2919 | ||
219f2f23 PA |
2920 | /* Handle tracepoint data collecting. This may overflow the |
2921 | trace buffer, and cause a tracing stop, removing | |
2922 | breakpoints. */ | |
2923 | trace_event = handle_tracepoints (event_child); | |
2924 | ||
6bf5e0ba PA |
2925 | if (bp_explains_trap) |
2926 | { | |
2927 | /* If we stepped or ran into an internal breakpoint, we've | |
2928 | already handled it. So next time we resume (from this | |
2929 | PC), we should step over it. */ | |
2930 | if (debug_threads) | |
87ce2a04 | 2931 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2932 | |
8b07ae33 PA |
2933 | if (breakpoint_here (event_child->stop_pc)) |
2934 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2935 | } |
2936 | } | |
2937 | else | |
2938 | { | |
2939 | /* We have some other signal, possibly a step-over dance was in | |
2940 | progress, and it should be cancelled too. */ | |
2941 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2942 | } |
2943 | ||
2944 | /* We have all the data we need. Either report the event to GDB, or | |
2945 | resume threads and keep waiting for more. */ | |
2946 | ||
2947 | /* If we're collecting a fast tracepoint, finish the collection and | |
2948 | move out of the jump pad before delivering a signal. See | |
2949 | linux_stabilize_threads. */ | |
2950 | ||
2951 | if (WIFSTOPPED (w) | |
2952 | && WSTOPSIG (w) != SIGTRAP | |
2953 | && supports_fast_tracepoints () | |
58b4daa5 | 2954 | && agent_loaded_p ()) |
fa593d66 PA |
2955 | { |
2956 | if (debug_threads) | |
87ce2a04 DE |
2957 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
2958 | "to defer or adjust it.\n", | |
0bfdf32f | 2959 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
2960 | |
2961 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 2962 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
2963 | && maybe_move_out_of_jump_pad (event_child, &w)) |
2964 | { | |
2965 | enqueue_one_deferred_signal (event_child, &w); | |
2966 | ||
2967 | if (debug_threads) | |
87ce2a04 | 2968 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 2969 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
2970 | |
2971 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
582511be PA |
2972 | |
2973 | return ignore_event (ourstatus); | |
fa593d66 PA |
2974 | } |
2975 | } | |
219f2f23 | 2976 | |
fa593d66 PA |
2977 | if (event_child->collecting_fast_tracepoint) |
2978 | { | |
2979 | if (debug_threads) | |
87ce2a04 DE |
2980 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
2981 | "Check if we're already there.\n", | |
0bfdf32f | 2982 | lwpid_of (current_thread), |
87ce2a04 | 2983 | event_child->collecting_fast_tracepoint); |
fa593d66 PA |
2984 | |
2985 | trace_event = 1; | |
2986 | ||
2987 | event_child->collecting_fast_tracepoint | |
2988 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2989 | ||
2990 | if (event_child->collecting_fast_tracepoint != 1) | |
2991 | { | |
2992 | /* No longer need this breakpoint. */ | |
2993 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2994 | { | |
2995 | if (debug_threads) | |
87ce2a04 DE |
2996 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
2997 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2998 | |
2999 | /* Other running threads could hit this breakpoint. | |
3000 | We don't handle moribund locations like GDB does, | |
3001 | instead we always pause all threads when removing | |
3002 | breakpoints, so that any step-over or | |
3003 | decr_pc_after_break adjustment is always taken | |
3004 | care of while the breakpoint is still | |
3005 | inserted. */ | |
3006 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3007 | |
3008 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3009 | event_child->exit_jump_pad_bkpt = NULL; | |
3010 | ||
3011 | unstop_all_lwps (1, event_child); | |
3012 | ||
3013 | gdb_assert (event_child->suspended >= 0); | |
3014 | } | |
3015 | } | |
3016 | ||
3017 | if (event_child->collecting_fast_tracepoint == 0) | |
3018 | { | |
3019 | if (debug_threads) | |
87ce2a04 DE |
3020 | debug_printf ("fast tracepoint finished " |
3021 | "collecting successfully.\n"); | |
fa593d66 PA |
3022 | |
3023 | /* We may have a deferred signal to report. */ | |
3024 | if (dequeue_one_deferred_signal (event_child, &w)) | |
3025 | { | |
3026 | if (debug_threads) | |
87ce2a04 | 3027 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 3028 | } |
3c11dd79 | 3029 | else |
fa593d66 | 3030 | { |
3c11dd79 | 3031 | if (debug_threads) |
87ce2a04 | 3032 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
3033 | |
3034 | if (stabilizing_threads) | |
3035 | { | |
3036 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 3037 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
3038 | |
3039 | if (debug_threads) | |
3040 | { | |
3041 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
3042 | "while stabilizing threads\n", | |
0bfdf32f | 3043 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
3044 | debug_exit (); |
3045 | } | |
3046 | ||
0bfdf32f | 3047 | return ptid_of (current_thread); |
fa593d66 PA |
3048 | } |
3049 | } | |
3050 | } | |
6bf5e0ba PA |
3051 | } |
3052 | ||
e471f25b PA |
3053 | /* Check whether GDB would be interested in this event. */ |
3054 | ||
3055 | /* If GDB is not interested in this signal, don't stop other | |
3056 | threads, and don't report it to GDB. Just resume the inferior | |
3057 | right away. We do this for threading-related signals as well as | |
3058 | any that GDB specifically requested we ignore. But never ignore | |
3059 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3060 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3061 | handler. Also never ignore signals that could be caused by a |
3062 | breakpoint. */ | |
e471f25b PA |
3063 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
3064 | thread library? */ | |
3065 | if (WIFSTOPPED (w) | |
0bfdf32f | 3066 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3067 | && ( |
1a981360 | 3068 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3069 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3070 | && (WSTOPSIG (w) == __SIGRTMIN |
3071 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3072 | || | |
3073 | #endif | |
2ea28649 | 3074 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3075 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3076 | && current_thread->last_resume_kind == resume_stop) |
3077 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3078 | { |
3079 | siginfo_t info, *info_p; | |
3080 | ||
3081 | if (debug_threads) | |
87ce2a04 | 3082 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 3083 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 3084 | |
0bfdf32f | 3085 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3086 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3087 | info_p = &info; |
3088 | else | |
3089 | info_p = NULL; | |
3090 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3091 | WSTOPSIG (w), info_p); | |
582511be | 3092 | return ignore_event (ourstatus); |
e471f25b PA |
3093 | } |
3094 | ||
c2d6af84 PA |
3095 | /* Note that all addresses are always "out of the step range" when |
3096 | there's no range to begin with. */ | |
3097 | in_step_range = lwp_in_step_range (event_child); | |
3098 | ||
3099 | /* If GDB wanted this thread to single step, and the thread is out | |
3100 | of the step range, we always want to report the SIGTRAP, and let | |
3101 | GDB handle it. Watchpoints should always be reported. So should | |
3102 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3103 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3104 | do, we're be able to handle GDB breakpoints on top of internal | |
3105 | breakpoints, by handling the internal breakpoint and still | |
3106 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
3107 | won't see the breakpoint hit. */ | |
6bf5e0ba | 3108 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3109 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3110 | && !in_step_range) |
15c66dd6 | 3111 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
c2d6af84 | 3112 | || (!step_over_finished && !in_step_range |
493e2a69 | 3113 | && !bp_explains_trap && !trace_event) |
9f3a5c85 | 3114 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3115 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e DB |
3116 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
3117 | || extended_event_reported (&event_child->waitstatus)); | |
d3ce09f5 SS |
3118 | |
3119 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3120 | |
3121 | /* We found no reason GDB would want us to stop. We either hit one | |
3122 | of our own breakpoints, or finished an internal step GDB | |
3123 | shouldn't know about. */ | |
3124 | if (!report_to_gdb) | |
3125 | { | |
3126 | if (debug_threads) | |
3127 | { | |
3128 | if (bp_explains_trap) | |
87ce2a04 | 3129 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3130 | if (step_over_finished) |
87ce2a04 | 3131 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 3132 | if (trace_event) |
87ce2a04 | 3133 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 3134 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
3135 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
3136 | paddress (event_child->stop_pc), | |
3137 | paddress (event_child->step_range_start), | |
3138 | paddress (event_child->step_range_end)); | |
de0d863e DB |
3139 | if (extended_event_reported (&event_child->waitstatus)) |
3140 | { | |
3141 | char *str = target_waitstatus_to_string (ourstatus); | |
3142 | debug_printf ("LWP %ld: extended event with waitstatus %s\n", | |
3143 | lwpid_of (get_lwp_thread (event_child)), str); | |
3144 | xfree (str); | |
3145 | } | |
6bf5e0ba PA |
3146 | } |
3147 | ||
3148 | /* We're not reporting this breakpoint to GDB, so apply the | |
3149 | decr_pc_after_break adjustment to the inferior's regcache | |
3150 | ourselves. */ | |
3151 | ||
3152 | if (the_low_target.set_pc != NULL) | |
3153 | { | |
3154 | struct regcache *regcache | |
0bfdf32f | 3155 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
3156 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
3157 | } | |
3158 | ||
7984d532 PA |
3159 | /* We may have finished stepping over a breakpoint. If so, |
3160 | we've stopped and suspended all LWPs momentarily except the | |
3161 | stepping one. This is where we resume them all again. We're | |
3162 | going to keep waiting, so use proceed, which handles stepping | |
3163 | over the next breakpoint. */ | |
6bf5e0ba | 3164 | if (debug_threads) |
87ce2a04 | 3165 | debug_printf ("proceeding all threads.\n"); |
7984d532 PA |
3166 | |
3167 | if (step_over_finished) | |
3168 | unsuspend_all_lwps (event_child); | |
3169 | ||
6bf5e0ba | 3170 | proceed_all_lwps (); |
582511be | 3171 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3172 | } |
3173 | ||
3174 | if (debug_threads) | |
3175 | { | |
0bfdf32f | 3176 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
3177 | { |
3178 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 3179 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 3180 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 3181 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 3182 | } |
15c66dd6 | 3183 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 3184 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 3185 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 3186 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 3187 | if (debug_threads) |
87ce2a04 | 3188 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
3189 | } |
3190 | ||
3191 | /* Alright, we're going to report a stop. */ | |
3192 | ||
582511be | 3193 | if (!stabilizing_threads) |
6bf5e0ba PA |
3194 | { |
3195 | /* In all-stop, stop all threads. */ | |
582511be PA |
3196 | if (!non_stop) |
3197 | stop_all_lwps (0, NULL); | |
6bf5e0ba PA |
3198 | |
3199 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3200 | from among those that have had events. Giving equal priority | |
3201 | to all LWPs that have had events helps prevent | |
3202 | starvation. */ | |
3203 | if (ptid_equal (ptid, minus_one_ptid)) | |
3204 | { | |
3205 | event_child->status_pending_p = 1; | |
3206 | event_child->status_pending = w; | |
3207 | ||
3208 | select_event_lwp (&event_child); | |
3209 | ||
0bfdf32f GB |
3210 | /* current_thread and event_child must stay in sync. */ |
3211 | current_thread = get_lwp_thread (event_child); | |
ee1e2d4f | 3212 | |
6bf5e0ba PA |
3213 | event_child->status_pending_p = 0; |
3214 | w = event_child->status_pending; | |
3215 | } | |
3216 | ||
c03e6ccc | 3217 | if (step_over_finished) |
582511be PA |
3218 | { |
3219 | if (!non_stop) | |
3220 | { | |
3221 | /* If we were doing a step-over, all other threads but | |
3222 | the stepping one had been paused in start_step_over, | |
3223 | with their suspend counts incremented. We don't want | |
3224 | to do a full unstop/unpause, because we're in | |
3225 | all-stop mode (so we want threads stopped), but we | |
3226 | still need to unsuspend the other threads, to | |
3227 | decrement their `suspended' count back. */ | |
3228 | unsuspend_all_lwps (event_child); | |
3229 | } | |
3230 | else | |
3231 | { | |
3232 | /* If we just finished a step-over, then all threads had | |
3233 | been momentarily paused. In all-stop, that's fine, | |
3234 | we want threads stopped by now anyway. In non-stop, | |
3235 | we need to re-resume threads that GDB wanted to be | |
3236 | running. */ | |
3237 | unstop_all_lwps (1, event_child); | |
3238 | } | |
3239 | } | |
c03e6ccc | 3240 | |
fa593d66 | 3241 | /* Stabilize threads (move out of jump pads). */ |
582511be PA |
3242 | if (!non_stop) |
3243 | stabilize_threads (); | |
6bf5e0ba PA |
3244 | } |
3245 | else | |
3246 | { | |
3247 | /* If we just finished a step-over, then all threads had been | |
3248 | momentarily paused. In all-stop, that's fine, we want | |
3249 | threads stopped by now anyway. In non-stop, we need to | |
3250 | re-resume threads that GDB wanted to be running. */ | |
3251 | if (step_over_finished) | |
7984d532 | 3252 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3253 | } |
3254 | ||
de0d863e DB |
3255 | if (extended_event_reported (&event_child->waitstatus)) |
3256 | { | |
3257 | /* If the reported event is a fork, vfork or exec, let GDB know. */ | |
3258 | ourstatus->kind = event_child->waitstatus.kind; | |
3259 | ourstatus->value = event_child->waitstatus.value; | |
3260 | ||
3261 | /* Clear the event lwp's waitstatus since we handled it already. */ | |
3262 | event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3263 | } | |
3264 | else | |
3265 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
5b1c542e | 3266 | |
582511be | 3267 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3268 | it was a software breakpoint, and the client doesn't know we can |
3269 | adjust the breakpoint ourselves. */ | |
3270 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3271 | && !swbreak_feature) | |
582511be PA |
3272 | { |
3273 | int decr_pc = the_low_target.decr_pc_after_break; | |
3274 | ||
3275 | if (decr_pc != 0) | |
3276 | { | |
3277 | struct regcache *regcache | |
3278 | = get_thread_regcache (current_thread, 1); | |
3279 | (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc); | |
3280 | } | |
3281 | } | |
3282 | ||
0bfdf32f | 3283 | 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, | |
3287 | and it stopped cleanly, so report as SIG0. The use of | |
3288 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3289 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3290 | } |
0bfdf32f | 3291 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3292 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3293 | { |
3294 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3295 | but, it stopped for other reasons. */ |
2ea28649 | 3296 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 | 3297 | } |
de0d863e | 3298 | else if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
bd99dc85 | 3299 | { |
2ea28649 | 3300 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3301 | } |
3302 | ||
d50171e4 PA |
3303 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
3304 | ||
bd99dc85 | 3305 | if (debug_threads) |
87ce2a04 DE |
3306 | { |
3307 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
0bfdf32f | 3308 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3309 | ourstatus->kind, ourstatus->value.sig); |
3310 | debug_exit (); | |
3311 | } | |
bd99dc85 | 3312 | |
0bfdf32f | 3313 | return ptid_of (current_thread); |
bd99dc85 PA |
3314 | } |
3315 | ||
3316 | /* Get rid of any pending event in the pipe. */ | |
3317 | static void | |
3318 | async_file_flush (void) | |
3319 | { | |
3320 | int ret; | |
3321 | char buf; | |
3322 | ||
3323 | do | |
3324 | ret = read (linux_event_pipe[0], &buf, 1); | |
3325 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3326 | } | |
3327 | ||
3328 | /* Put something in the pipe, so the event loop wakes up. */ | |
3329 | static void | |
3330 | async_file_mark (void) | |
3331 | { | |
3332 | int ret; | |
3333 | ||
3334 | async_file_flush (); | |
3335 | ||
3336 | do | |
3337 | ret = write (linux_event_pipe[1], "+", 1); | |
3338 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3339 | ||
3340 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3341 | be awakened anyway. */ | |
3342 | } | |
3343 | ||
95954743 PA |
3344 | static ptid_t |
3345 | linux_wait (ptid_t ptid, | |
3346 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 3347 | { |
95954743 | 3348 | ptid_t event_ptid; |
bd99dc85 | 3349 | |
bd99dc85 PA |
3350 | /* Flush the async file first. */ |
3351 | if (target_is_async_p ()) | |
3352 | async_file_flush (); | |
3353 | ||
582511be PA |
3354 | do |
3355 | { | |
3356 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); | |
3357 | } | |
3358 | while ((target_options & TARGET_WNOHANG) == 0 | |
3359 | && ptid_equal (event_ptid, null_ptid) | |
3360 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); | |
bd99dc85 PA |
3361 | |
3362 | /* If at least one stop was reported, there may be more. A single | |
3363 | SIGCHLD can signal more than one child stop. */ | |
3364 | if (target_is_async_p () | |
3365 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 3366 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
3367 | async_file_mark (); |
3368 | ||
3369 | return event_ptid; | |
da6d8c04 DJ |
3370 | } |
3371 | ||
c5f62d5f | 3372 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3373 | |
3374 | static int | |
a1928bad | 3375 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3376 | { |
c5f62d5f DE |
3377 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
3378 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 3379 | |
c5f62d5f DE |
3380 | #ifdef __NR_tkill |
3381 | { | |
3382 | static int tkill_failed; | |
fd500816 | 3383 | |
c5f62d5f DE |
3384 | if (!tkill_failed) |
3385 | { | |
3386 | int ret; | |
3387 | ||
3388 | errno = 0; | |
3389 | ret = syscall (__NR_tkill, lwpid, signo); | |
3390 | if (errno != ENOSYS) | |
3391 | return ret; | |
3392 | tkill_failed = 1; | |
3393 | } | |
3394 | } | |
fd500816 DJ |
3395 | #endif |
3396 | ||
3397 | return kill (lwpid, signo); | |
3398 | } | |
3399 | ||
964e4306 PA |
3400 | void |
3401 | linux_stop_lwp (struct lwp_info *lwp) | |
3402 | { | |
3403 | send_sigstop (lwp); | |
3404 | } | |
3405 | ||
0d62e5e8 | 3406 | static void |
02fc4de7 | 3407 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3408 | { |
bd99dc85 | 3409 | int pid; |
0d62e5e8 | 3410 | |
d86d4aaf | 3411 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3412 | |
0d62e5e8 DJ |
3413 | /* If we already have a pending stop signal for this process, don't |
3414 | send another. */ | |
54a0b537 | 3415 | if (lwp->stop_expected) |
0d62e5e8 | 3416 | { |
ae13219e | 3417 | if (debug_threads) |
87ce2a04 | 3418 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3419 | |
0d62e5e8 DJ |
3420 | return; |
3421 | } | |
3422 | ||
3423 | if (debug_threads) | |
87ce2a04 | 3424 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3425 | |
d50171e4 | 3426 | lwp->stop_expected = 1; |
bd99dc85 | 3427 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3428 | } |
3429 | ||
7984d532 PA |
3430 | static int |
3431 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 | 3432 | { |
d86d4aaf DE |
3433 | struct thread_info *thread = (struct thread_info *) entry; |
3434 | struct lwp_info *lwp = get_thread_lwp (thread); | |
02fc4de7 | 3435 | |
7984d532 PA |
3436 | /* Ignore EXCEPT. */ |
3437 | if (lwp == except) | |
3438 | return 0; | |
3439 | ||
02fc4de7 | 3440 | if (lwp->stopped) |
7984d532 | 3441 | return 0; |
02fc4de7 PA |
3442 | |
3443 | send_sigstop (lwp); | |
7984d532 PA |
3444 | return 0; |
3445 | } | |
3446 | ||
3447 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3448 | yet. */ | |
3449 | static int | |
3450 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
3451 | void *except) | |
3452 | { | |
d86d4aaf DE |
3453 | struct thread_info *thread = (struct thread_info *) entry; |
3454 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
3455 | |
3456 | /* Ignore EXCEPT. */ | |
3457 | if (lwp == except) | |
3458 | return 0; | |
3459 | ||
3460 | lwp->suspended++; | |
3461 | ||
3462 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
3463 | } |
3464 | ||
95954743 PA |
3465 | static void |
3466 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3467 | { | |
3468 | /* It's dead, really. */ | |
3469 | lwp->dead = 1; | |
3470 | ||
3471 | /* Store the exit status for later. */ | |
3472 | lwp->status_pending_p = 1; | |
3473 | lwp->status_pending = wstat; | |
3474 | ||
95954743 PA |
3475 | /* Prevent trying to stop it. */ |
3476 | lwp->stopped = 1; | |
3477 | ||
3478 | /* No further stops are expected from a dead lwp. */ | |
3479 | lwp->stop_expected = 0; | |
3480 | } | |
3481 | ||
fa96cb38 PA |
3482 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
3483 | ||
0d62e5e8 | 3484 | static void |
fa96cb38 | 3485 | wait_for_sigstop (void) |
0d62e5e8 | 3486 | { |
0bfdf32f | 3487 | struct thread_info *saved_thread; |
95954743 | 3488 | ptid_t saved_tid; |
fa96cb38 PA |
3489 | int wstat; |
3490 | int ret; | |
0d62e5e8 | 3491 | |
0bfdf32f GB |
3492 | saved_thread = current_thread; |
3493 | if (saved_thread != NULL) | |
3494 | saved_tid = saved_thread->entry.id; | |
bd99dc85 | 3495 | else |
95954743 | 3496 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3497 | |
d50171e4 | 3498 | if (debug_threads) |
fa96cb38 | 3499 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3500 | |
fa96cb38 PA |
3501 | /* Passing NULL_PTID as filter indicates we want all events to be |
3502 | left pending. Eventually this returns when there are no | |
3503 | unwaited-for children left. */ | |
3504 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
3505 | &wstat, __WALL); | |
3506 | gdb_assert (ret == -1); | |
0d62e5e8 | 3507 | |
0bfdf32f GB |
3508 | if (saved_thread == NULL || linux_thread_alive (saved_tid)) |
3509 | current_thread = saved_thread; | |
0d62e5e8 DJ |
3510 | else |
3511 | { | |
3512 | if (debug_threads) | |
87ce2a04 | 3513 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3514 | |
bd99dc85 PA |
3515 | if (non_stop) |
3516 | { | |
3517 | /* We can't change the current inferior behind GDB's back, | |
3518 | otherwise, a subsequent command may apply to the wrong | |
3519 | process. */ | |
0bfdf32f | 3520 | current_thread = NULL; |
bd99dc85 PA |
3521 | } |
3522 | else | |
3523 | { | |
3524 | /* Set a valid thread as current. */ | |
0bfdf32f | 3525 | set_desired_thread (0); |
bd99dc85 | 3526 | } |
0d62e5e8 DJ |
3527 | } |
3528 | } | |
3529 | ||
fa593d66 PA |
3530 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3531 | move it out, because we need to report the stop event to GDB. For | |
3532 | example, if the user puts a breakpoint in the jump pad, it's | |
3533 | because she wants to debug it. */ | |
3534 | ||
3535 | static int | |
3536 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3537 | { | |
d86d4aaf DE |
3538 | struct thread_info *thread = (struct thread_info *) entry; |
3539 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3540 | |
3541 | gdb_assert (lwp->suspended == 0); | |
3542 | gdb_assert (lwp->stopped); | |
3543 | ||
3544 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3545 | return (supports_fast_tracepoints () | |
58b4daa5 | 3546 | && agent_loaded_p () |
fa593d66 | 3547 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 3548 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3549 | || thread->last_resume_kind == resume_step) |
3550 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3551 | } | |
3552 | ||
3553 | static void | |
3554 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3555 | { | |
d86d4aaf DE |
3556 | struct thread_info *thread = (struct thread_info *) entry; |
3557 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3558 | int *wstat; |
3559 | ||
3560 | gdb_assert (lwp->suspended == 0); | |
3561 | gdb_assert (lwp->stopped); | |
3562 | ||
3563 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3564 | ||
3565 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3566 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 3567 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3568 | && thread->last_resume_kind != resume_step |
3569 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3570 | { | |
3571 | if (debug_threads) | |
87ce2a04 | 3572 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3573 | lwpid_of (thread)); |
fa593d66 PA |
3574 | |
3575 | if (wstat) | |
3576 | { | |
3577 | lwp->status_pending_p = 0; | |
3578 | enqueue_one_deferred_signal (lwp, wstat); | |
3579 | ||
3580 | if (debug_threads) | |
87ce2a04 DE |
3581 | debug_printf ("Signal %d for LWP %ld deferred " |
3582 | "(in jump pad)\n", | |
d86d4aaf | 3583 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
3584 | } |
3585 | ||
3586 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3587 | } | |
3588 | else | |
3589 | lwp->suspended++; | |
3590 | } | |
3591 | ||
3592 | static int | |
3593 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3594 | { | |
d86d4aaf DE |
3595 | struct thread_info *thread = (struct thread_info *) entry; |
3596 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3597 | |
3598 | if (lwp->dead) | |
3599 | return 0; | |
3600 | if (lwp->stopped) | |
3601 | return 0; | |
3602 | return 1; | |
3603 | } | |
3604 | ||
7984d532 PA |
3605 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3606 | If SUSPEND, then also increase the suspend count of every LWP, | |
3607 | except EXCEPT. */ | |
3608 | ||
0d62e5e8 | 3609 | static void |
7984d532 | 3610 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3611 | { |
bde24c0a PA |
3612 | /* Should not be called recursively. */ |
3613 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3614 | ||
87ce2a04 DE |
3615 | if (debug_threads) |
3616 | { | |
3617 | debug_enter (); | |
3618 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
3619 | suspend ? "stop-and-suspend" : "stop", | |
3620 | except != NULL | |
d86d4aaf | 3621 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
3622 | : "none"); |
3623 | } | |
3624 | ||
bde24c0a PA |
3625 | stopping_threads = (suspend |
3626 | ? STOPPING_AND_SUSPENDING_THREADS | |
3627 | : STOPPING_THREADS); | |
7984d532 PA |
3628 | |
3629 | if (suspend) | |
d86d4aaf | 3630 | find_inferior (&all_threads, suspend_and_send_sigstop_callback, except); |
7984d532 | 3631 | else |
d86d4aaf | 3632 | find_inferior (&all_threads, send_sigstop_callback, except); |
fa96cb38 | 3633 | wait_for_sigstop (); |
bde24c0a | 3634 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
3635 | |
3636 | if (debug_threads) | |
3637 | { | |
3638 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
3639 | "back to !stopping\n"); | |
3640 | debug_exit (); | |
3641 | } | |
0d62e5e8 DJ |
3642 | } |
3643 | ||
23f238d3 PA |
3644 | /* Resume execution of LWP. If STEP is nonzero, single-step it. If |
3645 | SIGNAL is nonzero, give it that signal. */ | |
da6d8c04 | 3646 | |
ce3a066d | 3647 | static void |
23f238d3 PA |
3648 | linux_resume_one_lwp_throw (struct lwp_info *lwp, |
3649 | int step, int signal, siginfo_t *info) | |
da6d8c04 | 3650 | { |
d86d4aaf | 3651 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 3652 | struct thread_info *saved_thread; |
fa593d66 | 3653 | int fast_tp_collecting; |
0d62e5e8 | 3654 | |
54a0b537 | 3655 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3656 | return; |
3657 | ||
fa593d66 PA |
3658 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3659 | ||
3660 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3661 | ||
219f2f23 PA |
3662 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3663 | user used the "jump" command, or "set $pc = foo"). */ | |
3664 | if (lwp->stop_pc != get_pc (lwp)) | |
3665 | { | |
3666 | /* Collecting 'while-stepping' actions doesn't make sense | |
3667 | anymore. */ | |
d86d4aaf | 3668 | release_while_stepping_state_list (thread); |
219f2f23 PA |
3669 | } |
3670 | ||
0d62e5e8 DJ |
3671 | /* If we have pending signals or status, and a new signal, enqueue the |
3672 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3673 | breakpoint; it will be picked up again below. */ | |
3674 | if (signal != 0 | |
fa593d66 PA |
3675 | && (lwp->status_pending_p |
3676 | || lwp->pending_signals != NULL | |
3677 | || lwp->bp_reinsert != 0 | |
3678 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3679 | { |
3680 | struct pending_signals *p_sig; | |
bca929d3 | 3681 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3682 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3683 | p_sig->signal = signal; |
32ca6d61 DJ |
3684 | if (info == NULL) |
3685 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3686 | else | |
3687 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3688 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3689 | } |
3690 | ||
d50171e4 PA |
3691 | if (lwp->status_pending_p) |
3692 | { | |
3693 | if (debug_threads) | |
87ce2a04 DE |
3694 | debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);" |
3695 | " has pending status\n", | |
d86d4aaf | 3696 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3697 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
3698 | return; |
3699 | } | |
0d62e5e8 | 3700 | |
0bfdf32f GB |
3701 | saved_thread = current_thread; |
3702 | current_thread = thread; | |
0d62e5e8 DJ |
3703 | |
3704 | if (debug_threads) | |
87ce2a04 | 3705 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", |
d86d4aaf | 3706 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3707 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3708 | |
3709 | /* This bit needs some thinking about. If we get a signal that | |
3710 | we must report while a single-step reinsert is still pending, | |
3711 | we often end up resuming the thread. It might be better to | |
3712 | (ew) allow a stack of pending events; then we could be sure that | |
3713 | the reinsert happened right away and not lose any signals. | |
3714 | ||
3715 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3716 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3717 | complete correctness, so it won't solve that problem. It may be |
3718 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3719 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3720 | { |
3721 | if (debug_threads) | |
87ce2a04 DE |
3722 | debug_printf (" pending reinsert at 0x%s\n", |
3723 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 3724 | |
85e00e85 | 3725 | if (can_hardware_single_step ()) |
d50171e4 | 3726 | { |
fa593d66 PA |
3727 | if (fast_tp_collecting == 0) |
3728 | { | |
3729 | if (step == 0) | |
3730 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3731 | if (lwp->suspended) | |
3732 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3733 | lwp->suspended); | |
3734 | } | |
d50171e4 PA |
3735 | |
3736 | step = 1; | |
3737 | } | |
0d62e5e8 DJ |
3738 | |
3739 | /* Postpone any pending signal. It was enqueued above. */ | |
3740 | signal = 0; | |
3741 | } | |
3742 | ||
fa593d66 PA |
3743 | if (fast_tp_collecting == 1) |
3744 | { | |
3745 | if (debug_threads) | |
87ce2a04 DE |
3746 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3747 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 3748 | lwpid_of (thread)); |
fa593d66 PA |
3749 | |
3750 | /* Postpone any pending signal. It was enqueued above. */ | |
3751 | signal = 0; | |
3752 | } | |
3753 | else if (fast_tp_collecting == 2) | |
3754 | { | |
3755 | if (debug_threads) | |
87ce2a04 DE |
3756 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3757 | " single-stepping\n", | |
d86d4aaf | 3758 | lwpid_of (thread)); |
fa593d66 PA |
3759 | |
3760 | if (can_hardware_single_step ()) | |
3761 | step = 1; | |
3762 | else | |
38e08fca GB |
3763 | { |
3764 | internal_error (__FILE__, __LINE__, | |
3765 | "moving out of jump pad single-stepping" | |
3766 | " not implemented on this target"); | |
3767 | } | |
fa593d66 PA |
3768 | |
3769 | /* Postpone any pending signal. It was enqueued above. */ | |
3770 | signal = 0; | |
3771 | } | |
3772 | ||
219f2f23 PA |
3773 | /* If we have while-stepping actions in this thread set it stepping. |
3774 | If we have a signal to deliver, it may or may not be set to | |
3775 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3776 | while-stepping into a signal handler. A possible smart thing to | |
3777 | do would be to set an internal breakpoint at the signal return | |
3778 | address, continue, and carry on catching this while-stepping | |
3779 | action only when that breakpoint is hit. A future | |
3780 | enhancement. */ | |
d86d4aaf | 3781 | if (thread->while_stepping != NULL |
219f2f23 PA |
3782 | && can_hardware_single_step ()) |
3783 | { | |
3784 | if (debug_threads) | |
87ce2a04 | 3785 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 3786 | lwpid_of (thread)); |
219f2f23 PA |
3787 | step = 1; |
3788 | } | |
3789 | ||
582511be | 3790 | if (the_low_target.get_pc != NULL) |
0d62e5e8 | 3791 | { |
0bfdf32f | 3792 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be PA |
3793 | |
3794 | lwp->stop_pc = (*the_low_target.get_pc) (regcache); | |
3795 | ||
3796 | if (debug_threads) | |
3797 | { | |
3798 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
3799 | (long) lwp->stop_pc); | |
3800 | } | |
0d62e5e8 DJ |
3801 | } |
3802 | ||
fa593d66 PA |
3803 | /* If we have pending signals, consume one unless we are trying to |
3804 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3805 | collect. */ | |
3806 | if (lwp->pending_signals != NULL | |
3807 | && lwp->bp_reinsert == 0 | |
3808 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3809 | { |
3810 | struct pending_signals **p_sig; | |
3811 | ||
54a0b537 | 3812 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3813 | while ((*p_sig)->prev != NULL) |
3814 | p_sig = &(*p_sig)->prev; | |
3815 | ||
3816 | signal = (*p_sig)->signal; | |
32ca6d61 | 3817 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 3818 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3819 | &(*p_sig)->info); |
32ca6d61 | 3820 | |
0d62e5e8 DJ |
3821 | free (*p_sig); |
3822 | *p_sig = NULL; | |
3823 | } | |
3824 | ||
aa5ca48f DE |
3825 | if (the_low_target.prepare_to_resume != NULL) |
3826 | the_low_target.prepare_to_resume (lwp); | |
3827 | ||
d86d4aaf | 3828 | regcache_invalidate_thread (thread); |
da6d8c04 | 3829 | errno = 0; |
54a0b537 | 3830 | lwp->stepping = step; |
d86d4aaf | 3831 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (thread), |
b8e1b30e | 3832 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
3833 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3834 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 3835 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 3836 | |
0bfdf32f | 3837 | current_thread = saved_thread; |
da6d8c04 | 3838 | if (errno) |
23f238d3 PA |
3839 | perror_with_name ("resuming thread"); |
3840 | ||
3841 | /* Successfully resumed. Clear state that no longer makes sense, | |
3842 | and mark the LWP as running. Must not do this before resuming | |
3843 | otherwise if that fails other code will be confused. E.g., we'd | |
3844 | later try to stop the LWP and hang forever waiting for a stop | |
3845 | status. Note that we must not throw after this is cleared, | |
3846 | otherwise handle_zombie_lwp_error would get confused. */ | |
3847 | lwp->stopped = 0; | |
3848 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3849 | } | |
3850 | ||
3851 | /* Called when we try to resume a stopped LWP and that errors out. If | |
3852 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
3853 | or about to become), discard the error, clear any pending status | |
3854 | the LWP may have, and return true (we'll collect the exit status | |
3855 | soon enough). Otherwise, return false. */ | |
3856 | ||
3857 | static int | |
3858 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
3859 | { | |
3860 | struct thread_info *thread = get_lwp_thread (lp); | |
3861 | ||
3862 | /* If we get an error after resuming the LWP successfully, we'd | |
3863 | confuse !T state for the LWP being gone. */ | |
3864 | gdb_assert (lp->stopped); | |
3865 | ||
3866 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
3867 | because even if ptrace failed with ESRCH, the tracee may be "not | |
3868 | yet fully dead", but already refusing ptrace requests. In that | |
3869 | case the tracee has 'R (Running)' state for a little bit | |
3870 | (observed in Linux 3.18). See also the note on ESRCH in the | |
3871 | ptrace(2) man page. Instead, check whether the LWP has any state | |
3872 | other than ptrace-stopped. */ | |
3873 | ||
3874 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
3875 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 3876 | { |
23f238d3 PA |
3877 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
3878 | lp->status_pending_p = 0; | |
3879 | return 1; | |
3880 | } | |
3881 | return 0; | |
3882 | } | |
3883 | ||
3884 | /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP | |
3885 | disappears while we try to resume it. */ | |
3221518c | 3886 | |
23f238d3 PA |
3887 | static void |
3888 | linux_resume_one_lwp (struct lwp_info *lwp, | |
3889 | int step, int signal, siginfo_t *info) | |
3890 | { | |
3891 | TRY | |
3892 | { | |
3893 | linux_resume_one_lwp_throw (lwp, step, signal, info); | |
3894 | } | |
3895 | CATCH (ex, RETURN_MASK_ERROR) | |
3896 | { | |
3897 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
3898 | throw_exception (ex); | |
3221518c | 3899 | } |
23f238d3 | 3900 | END_CATCH |
da6d8c04 DJ |
3901 | } |
3902 | ||
2bd7c093 PA |
3903 | struct thread_resume_array |
3904 | { | |
3905 | struct thread_resume *resume; | |
3906 | size_t n; | |
3907 | }; | |
64386c31 | 3908 | |
ebcf782c DE |
3909 | /* This function is called once per thread via find_inferior. |
3910 | ARG is a pointer to a thread_resume_array struct. | |
3911 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
3912 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
3913 | |
3914 | This algorithm is O(threads * resume elements), but resume elements | |
3915 | is small (and will remain small at least until GDB supports thread | |
3916 | suspension). */ | |
ebcf782c | 3917 | |
2bd7c093 PA |
3918 | static int |
3919 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3920 | { |
d86d4aaf DE |
3921 | struct thread_info *thread = (struct thread_info *) entry; |
3922 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3923 | int ndx; |
2bd7c093 | 3924 | struct thread_resume_array *r; |
64386c31 | 3925 | |
2bd7c093 | 3926 | r = arg; |
64386c31 | 3927 | |
2bd7c093 | 3928 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3929 | { |
3930 | ptid_t ptid = r->resume[ndx].thread; | |
3931 | if (ptid_equal (ptid, minus_one_ptid) | |
3932 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
3933 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
3934 | of PID'. */ | |
d86d4aaf | 3935 | || (ptid_get_pid (ptid) == pid_of (thread) |
0c9070b3 YQ |
3936 | && (ptid_is_pid (ptid) |
3937 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 3938 | { |
d50171e4 | 3939 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3940 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3941 | { |
3942 | if (debug_threads) | |
87ce2a04 DE |
3943 | debug_printf ("already %s LWP %ld at GDB's request\n", |
3944 | (thread->last_status.kind | |
3945 | == TARGET_WAITKIND_STOPPED) | |
3946 | ? "stopped" | |
3947 | : "stopping", | |
d86d4aaf | 3948 | lwpid_of (thread)); |
d50171e4 PA |
3949 | |
3950 | continue; | |
3951 | } | |
3952 | ||
95954743 | 3953 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3954 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 3955 | |
c2d6af84 PA |
3956 | lwp->step_range_start = lwp->resume->step_range_start; |
3957 | lwp->step_range_end = lwp->resume->step_range_end; | |
3958 | ||
fa593d66 PA |
3959 | /* If we had a deferred signal to report, dequeue one now. |
3960 | This can happen if LWP gets more than one signal while | |
3961 | trying to get out of a jump pad. */ | |
3962 | if (lwp->stopped | |
3963 | && !lwp->status_pending_p | |
3964 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3965 | { | |
3966 | lwp->status_pending_p = 1; | |
3967 | ||
3968 | if (debug_threads) | |
87ce2a04 DE |
3969 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
3970 | "leaving status pending.\n", | |
d86d4aaf DE |
3971 | WSTOPSIG (lwp->status_pending), |
3972 | lwpid_of (thread)); | |
fa593d66 PA |
3973 | } |
3974 | ||
95954743 PA |
3975 | return 0; |
3976 | } | |
3977 | } | |
2bd7c093 PA |
3978 | |
3979 | /* No resume action for this thread. */ | |
3980 | lwp->resume = NULL; | |
64386c31 | 3981 | |
2bd7c093 | 3982 | return 0; |
5544ad89 DJ |
3983 | } |
3984 | ||
20ad9378 DE |
3985 | /* find_inferior callback for linux_resume. |
3986 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 3987 | |
bd99dc85 PA |
3988 | static int |
3989 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3990 | { |
d86d4aaf DE |
3991 | struct thread_info *thread = (struct thread_info *) entry; |
3992 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3993 | |
bd99dc85 PA |
3994 | /* LWPs which will not be resumed are not interesting, because |
3995 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3996 | if (lwp->resume == NULL) |
bd99dc85 | 3997 | return 0; |
64386c31 | 3998 | |
582511be | 3999 | if (thread_still_has_status_pending_p (thread)) |
d50171e4 PA |
4000 | * (int *) flag_p = 1; |
4001 | ||
4002 | return 0; | |
4003 | } | |
4004 | ||
4005 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
4006 | internal breakpoint that we need to step over. It assumes that any | |
4007 | required STOP_PC adjustment has already been propagated to the | |
4008 | inferior's regcache. */ | |
4009 | ||
4010 | static int | |
4011 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
4012 | { | |
d86d4aaf DE |
4013 | struct thread_info *thread = (struct thread_info *) entry; |
4014 | struct lwp_info *lwp = get_thread_lwp (thread); | |
0bfdf32f | 4015 | struct thread_info *saved_thread; |
d50171e4 PA |
4016 | CORE_ADDR pc; |
4017 | ||
4018 | /* LWPs which will not be resumed are not interesting, because we | |
4019 | might not wait for them next time through linux_wait. */ | |
4020 | ||
4021 | if (!lwp->stopped) | |
4022 | { | |
4023 | if (debug_threads) | |
87ce2a04 | 4024 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 4025 | lwpid_of (thread)); |
d50171e4 PA |
4026 | return 0; |
4027 | } | |
4028 | ||
8336d594 | 4029 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4030 | { |
4031 | if (debug_threads) | |
87ce2a04 DE |
4032 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
4033 | " stopped\n", | |
d86d4aaf | 4034 | lwpid_of (thread)); |
d50171e4 PA |
4035 | return 0; |
4036 | } | |
4037 | ||
7984d532 PA |
4038 | gdb_assert (lwp->suspended >= 0); |
4039 | ||
4040 | if (lwp->suspended) | |
4041 | { | |
4042 | if (debug_threads) | |
87ce2a04 | 4043 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 4044 | lwpid_of (thread)); |
7984d532 PA |
4045 | return 0; |
4046 | } | |
4047 | ||
d50171e4 PA |
4048 | if (!lwp->need_step_over) |
4049 | { | |
4050 | if (debug_threads) | |
d86d4aaf | 4051 | debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread)); |
d50171e4 | 4052 | } |
5544ad89 | 4053 | |
bd99dc85 | 4054 | if (lwp->status_pending_p) |
d50171e4 PA |
4055 | { |
4056 | if (debug_threads) | |
87ce2a04 DE |
4057 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
4058 | " status.\n", | |
d86d4aaf | 4059 | lwpid_of (thread)); |
d50171e4 PA |
4060 | return 0; |
4061 | } | |
4062 | ||
4063 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4064 | or we have. */ | |
4065 | pc = get_pc (lwp); | |
4066 | ||
4067 | /* If the PC has changed since we stopped, then don't do anything, | |
4068 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4069 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4070 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4071 | command, or poked thread's registers herself. */ | |
4072 | if (pc != lwp->stop_pc) | |
4073 | { | |
4074 | if (debug_threads) | |
87ce2a04 DE |
4075 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
4076 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
4077 | lwpid_of (thread), |
4078 | paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
4079 | |
4080 | lwp->need_step_over = 0; | |
4081 | return 0; | |
4082 | } | |
4083 | ||
0bfdf32f GB |
4084 | saved_thread = current_thread; |
4085 | current_thread = thread; | |
d50171e4 | 4086 | |
8b07ae33 | 4087 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4088 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4089 | { |
8b07ae33 | 4090 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4091 | though. If the condition is being evaluated on the target's side |
4092 | and it evaluate to false, step over this breakpoint as well. */ | |
4093 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4094 | && gdb_condition_true_at_breakpoint (pc) |
4095 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
4096 | { |
4097 | if (debug_threads) | |
87ce2a04 DE |
4098 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
4099 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 4100 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4101 | |
0bfdf32f | 4102 | current_thread = saved_thread; |
8b07ae33 PA |
4103 | return 0; |
4104 | } | |
4105 | else | |
4106 | { | |
4107 | if (debug_threads) | |
87ce2a04 DE |
4108 | debug_printf ("Need step over [LWP %ld]? yes, " |
4109 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 4110 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4111 | |
8b07ae33 PA |
4112 | /* We've found an lwp that needs stepping over --- return 1 so |
4113 | that find_inferior stops looking. */ | |
0bfdf32f | 4114 | current_thread = saved_thread; |
8b07ae33 PA |
4115 | |
4116 | /* If the step over is cancelled, this is set again. */ | |
4117 | lwp->need_step_over = 0; | |
4118 | return 1; | |
4119 | } | |
d50171e4 PA |
4120 | } |
4121 | ||
0bfdf32f | 4122 | current_thread = saved_thread; |
d50171e4 PA |
4123 | |
4124 | if (debug_threads) | |
87ce2a04 DE |
4125 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
4126 | " at 0x%s\n", | |
d86d4aaf | 4127 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 4128 | |
bd99dc85 | 4129 | return 0; |
5544ad89 DJ |
4130 | } |
4131 | ||
d50171e4 PA |
4132 | /* Start a step-over operation on LWP. When LWP stopped at a |
4133 | breakpoint, to make progress, we need to remove the breakpoint out | |
4134 | of the way. If we let other threads run while we do that, they may | |
4135 | pass by the breakpoint location and miss hitting it. To avoid | |
4136 | that, a step-over momentarily stops all threads while LWP is | |
4137 | single-stepped while the breakpoint is temporarily uninserted from | |
4138 | the inferior. When the single-step finishes, we reinsert the | |
4139 | breakpoint, and let all threads that are supposed to be running, | |
4140 | run again. | |
4141 | ||
4142 | On targets that don't support hardware single-step, we don't | |
4143 | currently support full software single-stepping. Instead, we only | |
4144 | support stepping over the thread event breakpoint, by asking the | |
4145 | low target where to place a reinsert breakpoint. Since this | |
4146 | routine assumes the breakpoint being stepped over is a thread event | |
4147 | breakpoint, it usually assumes the return address of the current | |
4148 | function is a good enough place to set the reinsert breakpoint. */ | |
4149 | ||
4150 | static int | |
4151 | start_step_over (struct lwp_info *lwp) | |
4152 | { | |
d86d4aaf | 4153 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4154 | struct thread_info *saved_thread; |
d50171e4 PA |
4155 | CORE_ADDR pc; |
4156 | int step; | |
4157 | ||
4158 | if (debug_threads) | |
87ce2a04 | 4159 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 4160 | lwpid_of (thread)); |
d50171e4 | 4161 | |
7984d532 PA |
4162 | stop_all_lwps (1, lwp); |
4163 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
4164 | |
4165 | if (debug_threads) | |
87ce2a04 | 4166 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
4167 | |
4168 | /* Note, we should always reach here with an already adjusted PC, | |
4169 | either by GDB (if we're resuming due to GDB's request), or by our | |
4170 | caller, if we just finished handling an internal breakpoint GDB | |
4171 | shouldn't care about. */ | |
4172 | pc = get_pc (lwp); | |
4173 | ||
0bfdf32f GB |
4174 | saved_thread = current_thread; |
4175 | current_thread = thread; | |
d50171e4 PA |
4176 | |
4177 | lwp->bp_reinsert = pc; | |
4178 | uninsert_breakpoints_at (pc); | |
fa593d66 | 4179 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
4180 | |
4181 | if (can_hardware_single_step ()) | |
4182 | { | |
4183 | step = 1; | |
4184 | } | |
4185 | else | |
4186 | { | |
4187 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
4188 | set_reinsert_breakpoint (raddr); | |
4189 | step = 0; | |
4190 | } | |
4191 | ||
0bfdf32f | 4192 | current_thread = saved_thread; |
d50171e4 PA |
4193 | |
4194 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
4195 | ||
4196 | /* Require next event from this LWP. */ | |
d86d4aaf | 4197 | step_over_bkpt = thread->entry.id; |
d50171e4 PA |
4198 | return 1; |
4199 | } | |
4200 | ||
4201 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
4202 | start_step_over, if still there, and delete any reinsert | |
4203 | breakpoints we've set, on non hardware single-step targets. */ | |
4204 | ||
4205 | static int | |
4206 | finish_step_over (struct lwp_info *lwp) | |
4207 | { | |
4208 | if (lwp->bp_reinsert != 0) | |
4209 | { | |
4210 | if (debug_threads) | |
87ce2a04 | 4211 | debug_printf ("Finished step over.\n"); |
d50171e4 PA |
4212 | |
4213 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
4214 | may be no breakpoint to reinsert there by now. */ | |
4215 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4216 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4217 | |
4218 | lwp->bp_reinsert = 0; | |
4219 | ||
4220 | /* Delete any software-single-step reinsert breakpoints. No | |
4221 | longer needed. We don't have to worry about other threads | |
4222 | hitting this trap, and later not being able to explain it, | |
4223 | because we were stepping over a breakpoint, and we hold all | |
4224 | threads but LWP stopped while doing that. */ | |
4225 | if (!can_hardware_single_step ()) | |
4226 | delete_reinsert_breakpoints (); | |
4227 | ||
4228 | step_over_bkpt = null_ptid; | |
4229 | return 1; | |
4230 | } | |
4231 | else | |
4232 | return 0; | |
4233 | } | |
4234 | ||
5544ad89 DJ |
4235 | /* This function is called once per thread. We check the thread's resume |
4236 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 4237 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 4238 | |
bd99dc85 PA |
4239 | For threads which we aren't explicitly told otherwise, we preserve |
4240 | the stepping flag; this is used for stepping over gdbserver-placed | |
4241 | breakpoints. | |
4242 | ||
4243 | If pending_flags was set in any thread, we queue any needed | |
4244 | signals, since we won't actually resume. We already have a pending | |
4245 | event to report, so we don't need to preserve any step requests; | |
4246 | they should be re-issued if necessary. */ | |
4247 | ||
4248 | static int | |
4249 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 4250 | { |
d86d4aaf DE |
4251 | struct thread_info *thread = (struct thread_info *) entry; |
4252 | struct lwp_info *lwp = get_thread_lwp (thread); | |
bd99dc85 | 4253 | int step; |
d50171e4 PA |
4254 | int leave_all_stopped = * (int *) arg; |
4255 | int leave_pending; | |
5544ad89 | 4256 | |
2bd7c093 | 4257 | if (lwp->resume == NULL) |
bd99dc85 | 4258 | return 0; |
5544ad89 | 4259 | |
bd99dc85 | 4260 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 4261 | { |
bd99dc85 | 4262 | if (debug_threads) |
d86d4aaf | 4263 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
4264 | |
4265 | if (!lwp->stopped) | |
4266 | { | |
4267 | if (debug_threads) | |
d86d4aaf | 4268 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 4269 | |
d50171e4 PA |
4270 | /* Stop the thread, and wait for the event asynchronously, |
4271 | through the event loop. */ | |
02fc4de7 | 4272 | send_sigstop (lwp); |
bd99dc85 PA |
4273 | } |
4274 | else | |
4275 | { | |
4276 | if (debug_threads) | |
87ce2a04 | 4277 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 4278 | lwpid_of (thread)); |
d50171e4 PA |
4279 | |
4280 | /* The LWP may have been stopped in an internal event that | |
4281 | was not meant to be notified back to GDB (e.g., gdbserver | |
4282 | breakpoint), so we should be reporting a stop event in | |
4283 | this case too. */ | |
4284 | ||
4285 | /* If the thread already has a pending SIGSTOP, this is a | |
4286 | no-op. Otherwise, something later will presumably resume | |
4287 | the thread and this will cause it to cancel any pending | |
4288 | operation, due to last_resume_kind == resume_stop. If | |
4289 | the thread already has a pending status to report, we | |
4290 | will still report it the next time we wait - see | |
4291 | status_pending_p_callback. */ | |
1a981360 PA |
4292 | |
4293 | /* If we already have a pending signal to report, then | |
4294 | there's no need to queue a SIGSTOP, as this means we're | |
4295 | midway through moving the LWP out of the jumppad, and we | |
4296 | will report the pending signal as soon as that is | |
4297 | finished. */ | |
4298 | if (lwp->pending_signals_to_report == NULL) | |
4299 | send_sigstop (lwp); | |
bd99dc85 | 4300 | } |
32ca6d61 | 4301 | |
bd99dc85 PA |
4302 | /* For stop requests, we're done. */ |
4303 | lwp->resume = NULL; | |
fc7238bb | 4304 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4305 | return 0; |
5544ad89 DJ |
4306 | } |
4307 | ||
bd99dc85 PA |
4308 | /* If this thread which is about to be resumed has a pending status, |
4309 | then don't resume any threads - we can just report the pending | |
4310 | status. Make sure to queue any signals that would otherwise be | |
4311 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
4312 | thread has a pending status. If there's a thread that needs the |
4313 | step-over-breakpoint dance, then don't resume any other thread | |
4314 | but that particular one. */ | |
4315 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 4316 | |
d50171e4 | 4317 | if (!leave_pending) |
bd99dc85 PA |
4318 | { |
4319 | if (debug_threads) | |
d86d4aaf | 4320 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 4321 | |
d50171e4 | 4322 | step = (lwp->resume->kind == resume_step); |
2acc282a | 4323 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
4324 | } |
4325 | else | |
4326 | { | |
4327 | if (debug_threads) | |
d86d4aaf | 4328 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
5544ad89 | 4329 | |
bd99dc85 PA |
4330 | /* If we have a new signal, enqueue the signal. */ |
4331 | if (lwp->resume->sig != 0) | |
4332 | { | |
4333 | struct pending_signals *p_sig; | |
4334 | p_sig = xmalloc (sizeof (*p_sig)); | |
4335 | p_sig->prev = lwp->pending_signals; | |
4336 | p_sig->signal = lwp->resume->sig; | |
4337 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
4338 | ||
4339 | /* If this is the same signal we were previously stopped by, | |
4340 | make sure to queue its siginfo. We can ignore the return | |
4341 | value of ptrace; if it fails, we'll skip | |
4342 | PTRACE_SETSIGINFO. */ | |
4343 | if (WIFSTOPPED (lwp->last_status) | |
4344 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
d86d4aaf | 4345 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4346 | &p_sig->info); |
bd99dc85 PA |
4347 | |
4348 | lwp->pending_signals = p_sig; | |
4349 | } | |
4350 | } | |
5544ad89 | 4351 | |
fc7238bb | 4352 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4353 | lwp->resume = NULL; |
5544ad89 | 4354 | return 0; |
0d62e5e8 DJ |
4355 | } |
4356 | ||
4357 | static void | |
2bd7c093 | 4358 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 4359 | { |
2bd7c093 | 4360 | struct thread_resume_array array = { resume_info, n }; |
d86d4aaf | 4361 | struct thread_info *need_step_over = NULL; |
d50171e4 PA |
4362 | int any_pending; |
4363 | int leave_all_stopped; | |
c6ecbae5 | 4364 | |
87ce2a04 DE |
4365 | if (debug_threads) |
4366 | { | |
4367 | debug_enter (); | |
4368 | debug_printf ("linux_resume:\n"); | |
4369 | } | |
4370 | ||
2bd7c093 | 4371 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 4372 | |
d50171e4 PA |
4373 | /* If there is a thread which would otherwise be resumed, which has |
4374 | a pending status, then don't resume any threads - we can just | |
4375 | report the pending status. Make sure to queue any signals that | |
4376 | would otherwise be sent. In non-stop mode, we'll apply this | |
4377 | logic to each thread individually. We consume all pending events | |
4378 | before considering to start a step-over (in all-stop). */ | |
4379 | any_pending = 0; | |
bd99dc85 | 4380 | if (!non_stop) |
d86d4aaf | 4381 | find_inferior (&all_threads, resume_status_pending_p, &any_pending); |
d50171e4 PA |
4382 | |
4383 | /* If there is a thread which would otherwise be resumed, which is | |
4384 | stopped at a breakpoint that needs stepping over, then don't | |
4385 | resume any threads - have it step over the breakpoint with all | |
4386 | other threads stopped, then resume all threads again. Make sure | |
4387 | to queue any signals that would otherwise be delivered or | |
4388 | queued. */ | |
4389 | if (!any_pending && supports_breakpoints ()) | |
4390 | need_step_over | |
d86d4aaf DE |
4391 | = (struct thread_info *) find_inferior (&all_threads, |
4392 | need_step_over_p, NULL); | |
d50171e4 PA |
4393 | |
4394 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
4395 | ||
4396 | if (debug_threads) | |
4397 | { | |
4398 | if (need_step_over != NULL) | |
87ce2a04 | 4399 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 4400 | else if (any_pending) |
87ce2a04 DE |
4401 | debug_printf ("Not resuming, all-stop and found " |
4402 | "an LWP with pending status\n"); | |
d50171e4 | 4403 | else |
87ce2a04 | 4404 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4405 | } |
4406 | ||
4407 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4408 | otherwise deliver. */ | |
4409 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
4410 | ||
4411 | if (need_step_over) | |
d86d4aaf | 4412 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4413 | |
4414 | if (debug_threads) | |
4415 | { | |
4416 | debug_printf ("linux_resume done\n"); | |
4417 | debug_exit (); | |
4418 | } | |
d50171e4 PA |
4419 | } |
4420 | ||
4421 | /* This function is called once per thread. We check the thread's | |
4422 | last resume request, which will tell us whether to resume, step, or | |
4423 | leave the thread stopped. Any signal the client requested to be | |
4424 | delivered has already been enqueued at this point. | |
4425 | ||
4426 | If any thread that GDB wants running is stopped at an internal | |
4427 | breakpoint that needs stepping over, we start a step-over operation | |
4428 | on that particular thread, and leave all others stopped. */ | |
4429 | ||
7984d532 PA |
4430 | static int |
4431 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 4432 | { |
d86d4aaf DE |
4433 | struct thread_info *thread = (struct thread_info *) entry; |
4434 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
4435 | int step; |
4436 | ||
7984d532 PA |
4437 | if (lwp == except) |
4438 | return 0; | |
d50171e4 PA |
4439 | |
4440 | if (debug_threads) | |
d86d4aaf | 4441 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4442 | |
4443 | if (!lwp->stopped) | |
4444 | { | |
4445 | if (debug_threads) | |
d86d4aaf | 4446 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
7984d532 | 4447 | return 0; |
d50171e4 PA |
4448 | } |
4449 | ||
02fc4de7 PA |
4450 | if (thread->last_resume_kind == resume_stop |
4451 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4452 | { |
4453 | if (debug_threads) | |
87ce2a04 | 4454 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4455 | lwpid_of (thread)); |
7984d532 | 4456 | return 0; |
d50171e4 PA |
4457 | } |
4458 | ||
4459 | if (lwp->status_pending_p) | |
4460 | { | |
4461 | if (debug_threads) | |
87ce2a04 | 4462 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4463 | lwpid_of (thread)); |
7984d532 | 4464 | return 0; |
d50171e4 PA |
4465 | } |
4466 | ||
7984d532 PA |
4467 | gdb_assert (lwp->suspended >= 0); |
4468 | ||
d50171e4 PA |
4469 | if (lwp->suspended) |
4470 | { | |
4471 | if (debug_threads) | |
d86d4aaf | 4472 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
7984d532 | 4473 | return 0; |
d50171e4 PA |
4474 | } |
4475 | ||
1a981360 PA |
4476 | if (thread->last_resume_kind == resume_stop |
4477 | && lwp->pending_signals_to_report == NULL | |
4478 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
4479 | { |
4480 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4481 | last_status.kind check above would catch it, and we wouldn't | |
4482 | reach here. This LWP may have been momentarily paused by a | |
4483 | stop_all_lwps call while handling for example, another LWP's | |
4484 | step-over. In that case, the pending expected SIGSTOP signal | |
4485 | that was queued at vCont;t handling time will have already | |
4486 | been consumed by wait_for_sigstop, and so we need to requeue | |
4487 | another one here. Note that if the LWP already has a SIGSTOP | |
4488 | pending, this is a no-op. */ | |
4489 | ||
4490 | if (debug_threads) | |
87ce2a04 DE |
4491 | debug_printf ("Client wants LWP %ld to stop. " |
4492 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 4493 | lwpid_of (thread)); |
02fc4de7 PA |
4494 | |
4495 | send_sigstop (lwp); | |
4496 | } | |
4497 | ||
8336d594 | 4498 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 4499 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
4500 | return 0; |
4501 | } | |
4502 | ||
4503 | static int | |
4504 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
4505 | { | |
d86d4aaf DE |
4506 | struct thread_info *thread = (struct thread_info *) entry; |
4507 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
4508 | |
4509 | if (lwp == except) | |
4510 | return 0; | |
4511 | ||
4512 | lwp->suspended--; | |
4513 | gdb_assert (lwp->suspended >= 0); | |
4514 | ||
4515 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
4516 | } |
4517 | ||
4518 | /* When we finish a step-over, set threads running again. If there's | |
4519 | another thread that may need a step-over, now's the time to start | |
4520 | it. Eventually, we'll move all threads past their breakpoints. */ | |
4521 | ||
4522 | static void | |
4523 | proceed_all_lwps (void) | |
4524 | { | |
d86d4aaf | 4525 | struct thread_info *need_step_over; |
d50171e4 PA |
4526 | |
4527 | /* If there is a thread which would otherwise be resumed, which is | |
4528 | stopped at a breakpoint that needs stepping over, then don't | |
4529 | resume any threads - have it step over the breakpoint with all | |
4530 | other threads stopped, then resume all threads again. */ | |
4531 | ||
4532 | if (supports_breakpoints ()) | |
4533 | { | |
4534 | need_step_over | |
d86d4aaf DE |
4535 | = (struct thread_info *) find_inferior (&all_threads, |
4536 | need_step_over_p, NULL); | |
d50171e4 PA |
4537 | |
4538 | if (need_step_over != NULL) | |
4539 | { | |
4540 | if (debug_threads) | |
87ce2a04 DE |
4541 | debug_printf ("proceed_all_lwps: found " |
4542 | "thread %ld needing a step-over\n", | |
4543 | lwpid_of (need_step_over)); | |
d50171e4 | 4544 | |
d86d4aaf | 4545 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
4546 | return; |
4547 | } | |
4548 | } | |
5544ad89 | 4549 | |
d50171e4 | 4550 | if (debug_threads) |
87ce2a04 | 4551 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 4552 | |
d86d4aaf | 4553 | find_inferior (&all_threads, proceed_one_lwp, NULL); |
d50171e4 PA |
4554 | } |
4555 | ||
4556 | /* Stopped LWPs that the client wanted to be running, that don't have | |
4557 | pending statuses, are set to run again, except for EXCEPT, if not | |
4558 | NULL. This undoes a stop_all_lwps call. */ | |
4559 | ||
4560 | static void | |
7984d532 | 4561 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 4562 | { |
5544ad89 DJ |
4563 | if (debug_threads) |
4564 | { | |
87ce2a04 | 4565 | debug_enter (); |
d50171e4 | 4566 | if (except) |
87ce2a04 | 4567 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 4568 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 4569 | else |
87ce2a04 | 4570 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
4571 | } |
4572 | ||
7984d532 | 4573 | if (unsuspend) |
d86d4aaf | 4574 | find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except); |
7984d532 | 4575 | else |
d86d4aaf | 4576 | find_inferior (&all_threads, proceed_one_lwp, except); |
87ce2a04 DE |
4577 | |
4578 | if (debug_threads) | |
4579 | { | |
4580 | debug_printf ("unstop_all_lwps done\n"); | |
4581 | debug_exit (); | |
4582 | } | |
0d62e5e8 DJ |
4583 | } |
4584 | ||
58caa3dc DJ |
4585 | |
4586 | #ifdef HAVE_LINUX_REGSETS | |
4587 | ||
1faeff08 MR |
4588 | #define use_linux_regsets 1 |
4589 | ||
030031ee PA |
4590 | /* Returns true if REGSET has been disabled. */ |
4591 | ||
4592 | static int | |
4593 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
4594 | { | |
4595 | return (info->disabled_regsets != NULL | |
4596 | && info->disabled_regsets[regset - info->regsets]); | |
4597 | } | |
4598 | ||
4599 | /* Disable REGSET. */ | |
4600 | ||
4601 | static void | |
4602 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
4603 | { | |
4604 | int dr_offset; | |
4605 | ||
4606 | dr_offset = regset - info->regsets; | |
4607 | if (info->disabled_regsets == NULL) | |
4608 | info->disabled_regsets = xcalloc (1, info->num_regsets); | |
4609 | info->disabled_regsets[dr_offset] = 1; | |
4610 | } | |
4611 | ||
58caa3dc | 4612 | static int |
3aee8918 PA |
4613 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
4614 | struct regcache *regcache) | |
58caa3dc DJ |
4615 | { |
4616 | struct regset_info *regset; | |
e9d25b98 | 4617 | int saw_general_regs = 0; |
95954743 | 4618 | int pid; |
1570b33e | 4619 | struct iovec iov; |
58caa3dc | 4620 | |
0bfdf32f | 4621 | pid = lwpid_of (current_thread); |
28eef672 | 4622 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4623 | { |
1570b33e L |
4624 | void *buf, *data; |
4625 | int nt_type, res; | |
58caa3dc | 4626 | |
030031ee | 4627 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 4628 | continue; |
58caa3dc | 4629 | |
bca929d3 | 4630 | buf = xmalloc (regset->size); |
1570b33e L |
4631 | |
4632 | nt_type = regset->nt_type; | |
4633 | if (nt_type) | |
4634 | { | |
4635 | iov.iov_base = buf; | |
4636 | iov.iov_len = regset->size; | |
4637 | data = (void *) &iov; | |
4638 | } | |
4639 | else | |
4640 | data = buf; | |
4641 | ||
dfb64f85 | 4642 | #ifndef __sparc__ |
f15f9948 | 4643 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4644 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4645 | #else |
1570b33e | 4646 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4647 | #endif |
58caa3dc DJ |
4648 | if (res < 0) |
4649 | { | |
4650 | if (errno == EIO) | |
4651 | { | |
52fa2412 | 4652 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4653 | this process mode. */ |
030031ee | 4654 | disable_regset (regsets_info, regset); |
58caa3dc | 4655 | } |
e5a9158d AA |
4656 | else if (errno == ENODATA) |
4657 | { | |
4658 | /* ENODATA may be returned if the regset is currently | |
4659 | not "active". This can happen in normal operation, | |
4660 | so suppress the warning in this case. */ | |
4661 | } | |
58caa3dc DJ |
4662 | else |
4663 | { | |
0d62e5e8 | 4664 | char s[256]; |
95954743 PA |
4665 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4666 | pid); | |
0d62e5e8 | 4667 | perror (s); |
58caa3dc DJ |
4668 | } |
4669 | } | |
098dbe61 AA |
4670 | else |
4671 | { | |
4672 | if (regset->type == GENERAL_REGS) | |
4673 | saw_general_regs = 1; | |
4674 | regset->store_function (regcache, buf); | |
4675 | } | |
fdeb2a12 | 4676 | free (buf); |
58caa3dc | 4677 | } |
e9d25b98 DJ |
4678 | if (saw_general_regs) |
4679 | return 0; | |
4680 | else | |
4681 | return 1; | |
58caa3dc DJ |
4682 | } |
4683 | ||
4684 | static int | |
3aee8918 PA |
4685 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
4686 | struct regcache *regcache) | |
58caa3dc DJ |
4687 | { |
4688 | struct regset_info *regset; | |
e9d25b98 | 4689 | int saw_general_regs = 0; |
95954743 | 4690 | int pid; |
1570b33e | 4691 | struct iovec iov; |
58caa3dc | 4692 | |
0bfdf32f | 4693 | pid = lwpid_of (current_thread); |
28eef672 | 4694 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4695 | { |
1570b33e L |
4696 | void *buf, *data; |
4697 | int nt_type, res; | |
58caa3dc | 4698 | |
feea5f36 AA |
4699 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
4700 | || regset->fill_function == NULL) | |
28eef672 | 4701 | continue; |
58caa3dc | 4702 | |
bca929d3 | 4703 | buf = xmalloc (regset->size); |
545587ee DJ |
4704 | |
4705 | /* First fill the buffer with the current register set contents, | |
4706 | in case there are any items in the kernel's regset that are | |
4707 | not in gdbserver's regcache. */ | |
1570b33e L |
4708 | |
4709 | nt_type = regset->nt_type; | |
4710 | if (nt_type) | |
4711 | { | |
4712 | iov.iov_base = buf; | |
4713 | iov.iov_len = regset->size; | |
4714 | data = (void *) &iov; | |
4715 | } | |
4716 | else | |
4717 | data = buf; | |
4718 | ||
dfb64f85 | 4719 | #ifndef __sparc__ |
f15f9948 | 4720 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4721 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4722 | #else |
689cc2ae | 4723 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4724 | #endif |
545587ee DJ |
4725 | |
4726 | if (res == 0) | |
4727 | { | |
4728 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4729 | regset->fill_function (regcache, buf); |
545587ee DJ |
4730 | |
4731 | /* Only now do we write the register set. */ | |
dfb64f85 | 4732 | #ifndef __sparc__ |
f15f9948 | 4733 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 4734 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4735 | #else |
1570b33e | 4736 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4737 | #endif |
545587ee DJ |
4738 | } |
4739 | ||
58caa3dc DJ |
4740 | if (res < 0) |
4741 | { | |
4742 | if (errno == EIO) | |
4743 | { | |
52fa2412 | 4744 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4745 | this process mode. */ |
030031ee | 4746 | disable_regset (regsets_info, regset); |
58caa3dc | 4747 | } |
3221518c UW |
4748 | else if (errno == ESRCH) |
4749 | { | |
1b3f6016 PA |
4750 | /* At this point, ESRCH should mean the process is |
4751 | already gone, in which case we simply ignore attempts | |
4752 | to change its registers. See also the related | |
4753 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4754 | free (buf); |
3221518c UW |
4755 | return 0; |
4756 | } | |
58caa3dc DJ |
4757 | else |
4758 | { | |
ce3a066d | 4759 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4760 | } |
4761 | } | |
e9d25b98 DJ |
4762 | else if (regset->type == GENERAL_REGS) |
4763 | saw_general_regs = 1; | |
09ec9b38 | 4764 | free (buf); |
58caa3dc | 4765 | } |
e9d25b98 DJ |
4766 | if (saw_general_regs) |
4767 | return 0; | |
4768 | else | |
4769 | return 1; | |
58caa3dc DJ |
4770 | } |
4771 | ||
1faeff08 | 4772 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4773 | |
1faeff08 | 4774 | #define use_linux_regsets 0 |
3aee8918 PA |
4775 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
4776 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 4777 | |
58caa3dc | 4778 | #endif |
1faeff08 MR |
4779 | |
4780 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4781 | calls or 0 if it has to be transferred individually. */ | |
4782 | ||
4783 | static int | |
3aee8918 | 4784 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
4785 | { |
4786 | unsigned char mask = 1 << (regno % 8); | |
4787 | size_t index = regno / 8; | |
4788 | ||
4789 | return (use_linux_regsets | |
3aee8918 PA |
4790 | && (regs_info->regset_bitmap == NULL |
4791 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
4792 | } |
4793 | ||
58caa3dc | 4794 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4795 | |
4796 | int | |
3aee8918 | 4797 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
4798 | { |
4799 | int addr; | |
4800 | ||
3aee8918 | 4801 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
4802 | error ("Invalid register number %d.", regnum); |
4803 | ||
3aee8918 | 4804 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
4805 | |
4806 | return addr; | |
4807 | } | |
4808 | ||
4809 | /* Fetch one register. */ | |
4810 | static void | |
3aee8918 PA |
4811 | fetch_register (const struct usrregs_info *usrregs, |
4812 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4813 | { |
4814 | CORE_ADDR regaddr; | |
4815 | int i, size; | |
4816 | char *buf; | |
4817 | int pid; | |
4818 | ||
3aee8918 | 4819 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4820 | return; |
4821 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4822 | return; | |
4823 | ||
3aee8918 | 4824 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4825 | if (regaddr == -1) |
4826 | return; | |
4827 | ||
3aee8918 PA |
4828 | size = ((register_size (regcache->tdesc, regno) |
4829 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4830 | & -sizeof (PTRACE_XFER_TYPE)); |
4831 | buf = alloca (size); | |
4832 | ||
0bfdf32f | 4833 | pid = lwpid_of (current_thread); |
1faeff08 MR |
4834 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4835 | { | |
4836 | errno = 0; | |
4837 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4838 | ptrace (PTRACE_PEEKUSER, pid, | |
4839 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4840 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4841 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
4842 | regaddr += sizeof (PTRACE_XFER_TYPE); |
4843 | if (errno != 0) | |
4844 | error ("reading register %d: %s", regno, strerror (errno)); | |
4845 | } | |
4846 | ||
4847 | if (the_low_target.supply_ptrace_register) | |
4848 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4849 | else | |
4850 | supply_register (regcache, regno, buf); | |
4851 | } | |
4852 | ||
4853 | /* Store one register. */ | |
4854 | static void | |
3aee8918 PA |
4855 | store_register (const struct usrregs_info *usrregs, |
4856 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4857 | { |
4858 | CORE_ADDR regaddr; | |
4859 | int i, size; | |
4860 | char *buf; | |
4861 | int pid; | |
4862 | ||
3aee8918 | 4863 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4864 | return; |
4865 | if ((*the_low_target.cannot_store_register) (regno)) | |
4866 | return; | |
4867 | ||
3aee8918 | 4868 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4869 | if (regaddr == -1) |
4870 | return; | |
4871 | ||
3aee8918 PA |
4872 | size = ((register_size (regcache->tdesc, regno) |
4873 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4874 | & -sizeof (PTRACE_XFER_TYPE)); |
4875 | buf = alloca (size); | |
4876 | memset (buf, 0, size); | |
4877 | ||
4878 | if (the_low_target.collect_ptrace_register) | |
4879 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4880 | else | |
4881 | collect_register (regcache, regno, buf); | |
4882 | ||
0bfdf32f | 4883 | pid = lwpid_of (current_thread); |
1faeff08 MR |
4884 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4885 | { | |
4886 | errno = 0; | |
4887 | ptrace (PTRACE_POKEUSER, pid, | |
4888 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4889 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4890 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
4891 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
4892 | if (errno != 0) |
4893 | { | |
4894 | /* At this point, ESRCH should mean the process is | |
4895 | already gone, in which case we simply ignore attempts | |
4896 | to change its registers. See also the related | |
4897 | comment in linux_resume_one_lwp. */ | |
4898 | if (errno == ESRCH) | |
4899 | return; | |
4900 | ||
4901 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4902 | error ("writing register %d: %s", regno, strerror (errno)); | |
4903 | } | |
4904 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4905 | } | |
4906 | } | |
4907 | ||
4908 | /* Fetch all registers, or just one, from the child process. | |
4909 | If REGNO is -1, do this for all registers, skipping any that are | |
4910 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4911 | unless ALL is non-zero. | |
4912 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4913 | static void | |
3aee8918 PA |
4914 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
4915 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4916 | { |
3aee8918 PA |
4917 | struct usrregs_info *usr = regs_info->usrregs; |
4918 | ||
1faeff08 MR |
4919 | if (regno == -1) |
4920 | { | |
3aee8918 PA |
4921 | for (regno = 0; regno < usr->num_regs; regno++) |
4922 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4923 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
4924 | } |
4925 | else | |
3aee8918 | 4926 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
4927 | } |
4928 | ||
4929 | /* Store our register values back into the inferior. | |
4930 | If REGNO is -1, do this for all registers, skipping any that are | |
4931 | assumed to have been saved by regsets_store_inferior_registers, | |
4932 | unless ALL is non-zero. | |
4933 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4934 | static void | |
3aee8918 PA |
4935 | usr_store_inferior_registers (const struct regs_info *regs_info, |
4936 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4937 | { |
3aee8918 PA |
4938 | struct usrregs_info *usr = regs_info->usrregs; |
4939 | ||
1faeff08 MR |
4940 | if (regno == -1) |
4941 | { | |
3aee8918 PA |
4942 | for (regno = 0; regno < usr->num_regs; regno++) |
4943 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4944 | store_register (usr, regcache, regno); | |
1faeff08 MR |
4945 | } |
4946 | else | |
3aee8918 | 4947 | store_register (usr, regcache, regno); |
1faeff08 MR |
4948 | } |
4949 | ||
4950 | #else /* !HAVE_LINUX_USRREGS */ | |
4951 | ||
3aee8918 PA |
4952 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
4953 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 4954 | |
58caa3dc | 4955 | #endif |
1faeff08 MR |
4956 | |
4957 | ||
4958 | void | |
4959 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4960 | { | |
4961 | int use_regsets; | |
4962 | int all = 0; | |
3aee8918 | 4963 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4964 | |
4965 | if (regno == -1) | |
4966 | { | |
3aee8918 PA |
4967 | if (the_low_target.fetch_register != NULL |
4968 | && regs_info->usrregs != NULL) | |
4969 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
4970 | (*the_low_target.fetch_register) (regcache, regno); |
4971 | ||
3aee8918 PA |
4972 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
4973 | if (regs_info->usrregs != NULL) | |
4974 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
4975 | } |
4976 | else | |
4977 | { | |
c14dfd32 PA |
4978 | if (the_low_target.fetch_register != NULL |
4979 | && (*the_low_target.fetch_register) (regcache, regno)) | |
4980 | return; | |
4981 | ||
3aee8918 | 4982 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4983 | if (use_regsets) |
3aee8918 PA |
4984 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
4985 | regcache); | |
4986 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4987 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4988 | } |
58caa3dc DJ |
4989 | } |
4990 | ||
4991 | void | |
442ea881 | 4992 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 4993 | { |
1faeff08 MR |
4994 | int use_regsets; |
4995 | int all = 0; | |
3aee8918 | 4996 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4997 | |
4998 | if (regno == -1) | |
4999 | { | |
3aee8918 PA |
5000 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5001 | regcache); | |
5002 | if (regs_info->usrregs != NULL) | |
5003 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5004 | } |
5005 | else | |
5006 | { | |
3aee8918 | 5007 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5008 | if (use_regsets) |
3aee8918 PA |
5009 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5010 | regcache); | |
5011 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5012 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5013 | } |
58caa3dc DJ |
5014 | } |
5015 | ||
da6d8c04 | 5016 | |
da6d8c04 DJ |
5017 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
5018 | to debugger memory starting at MYADDR. */ | |
5019 | ||
c3e735a6 | 5020 | static int |
f450004a | 5021 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 5022 | { |
0bfdf32f | 5023 | int pid = lwpid_of (current_thread); |
4934b29e MR |
5024 | register PTRACE_XFER_TYPE *buffer; |
5025 | register CORE_ADDR addr; | |
5026 | register int count; | |
5027 | char filename[64]; | |
da6d8c04 | 5028 | register int i; |
4934b29e | 5029 | int ret; |
fd462a61 | 5030 | int fd; |
fd462a61 DJ |
5031 | |
5032 | /* Try using /proc. Don't bother for one word. */ | |
5033 | if (len >= 3 * sizeof (long)) | |
5034 | { | |
4934b29e MR |
5035 | int bytes; |
5036 | ||
fd462a61 DJ |
5037 | /* We could keep this file open and cache it - possibly one per |
5038 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5039 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5040 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5041 | if (fd == -1) | |
5042 | goto no_proc; | |
5043 | ||
5044 | /* If pread64 is available, use it. It's faster if the kernel | |
5045 | supports it (only one syscall), and it's 64-bit safe even on | |
5046 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5047 | application). */ | |
5048 | #ifdef HAVE_PREAD64 | |
4934b29e | 5049 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5050 | #else |
4934b29e MR |
5051 | bytes = -1; |
5052 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5053 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5054 | #endif |
fd462a61 DJ |
5055 | |
5056 | close (fd); | |
4934b29e MR |
5057 | if (bytes == len) |
5058 | return 0; | |
5059 | ||
5060 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5061 | if (bytes > 0) | |
5062 | { | |
5063 | memaddr += bytes; | |
5064 | myaddr += bytes; | |
5065 | len -= bytes; | |
5066 | } | |
fd462a61 | 5067 | } |
da6d8c04 | 5068 | |
fd462a61 | 5069 | no_proc: |
4934b29e MR |
5070 | /* Round starting address down to longword boundary. */ |
5071 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5072 | /* Round ending address up; get number of longwords that makes. */ | |
5073 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5074 | / sizeof (PTRACE_XFER_TYPE)); | |
5075 | /* Allocate buffer of that many longwords. */ | |
5076 | buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
5077 | ||
da6d8c04 | 5078 | /* Read all the longwords */ |
4934b29e | 5079 | errno = 0; |
da6d8c04 DJ |
5080 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5081 | { | |
14ce3065 DE |
5082 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5083 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5084 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5085 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5086 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5087 | if (errno) |
4934b29e | 5088 | break; |
da6d8c04 | 5089 | } |
4934b29e | 5090 | ret = errno; |
da6d8c04 DJ |
5091 | |
5092 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5093 | if (i > 0) |
5094 | { | |
5095 | i *= sizeof (PTRACE_XFER_TYPE); | |
5096 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5097 | memcpy (myaddr, | |
5098 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5099 | i < len ? i : len); | |
5100 | } | |
c3e735a6 | 5101 | |
4934b29e | 5102 | return ret; |
da6d8c04 DJ |
5103 | } |
5104 | ||
93ae6fdc PA |
5105 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5106 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5107 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5108 | |
ce3a066d | 5109 | static int |
f450004a | 5110 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
5111 | { |
5112 | register int i; | |
5113 | /* Round starting address down to longword boundary. */ | |
5114 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5115 | /* Round ending address up; get number of longwords that makes. */ | |
5116 | register int count | |
493e2a69 MS |
5117 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5118 | / sizeof (PTRACE_XFER_TYPE); | |
5119 | ||
da6d8c04 | 5120 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
5121 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
5122 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
5123 | ||
0bfdf32f | 5124 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5125 | |
f0ae6fc3 PA |
5126 | if (len == 0) |
5127 | { | |
5128 | /* Zero length write always succeeds. */ | |
5129 | return 0; | |
5130 | } | |
5131 | ||
0d62e5e8 DJ |
5132 | if (debug_threads) |
5133 | { | |
58d6951d DJ |
5134 | /* Dump up to four bytes. */ |
5135 | unsigned int val = * (unsigned int *) myaddr; | |
5136 | if (len == 1) | |
5137 | val = val & 0xff; | |
5138 | else if (len == 2) | |
5139 | val = val & 0xffff; | |
5140 | else if (len == 3) | |
5141 | val = val & 0xffffff; | |
de0d863e DB |
5142 | debug_printf ("Writing %0*x to 0x%08lx in process %d\n", |
5143 | 2 * ((len < 4) ? len : 4), val, (long)memaddr, pid); | |
0d62e5e8 DJ |
5144 | } |
5145 | ||
da6d8c04 DJ |
5146 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
5147 | ||
93ae6fdc | 5148 | errno = 0; |
14ce3065 DE |
5149 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5150 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5151 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5152 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5153 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
5154 | if (errno) |
5155 | return errno; | |
da6d8c04 DJ |
5156 | |
5157 | if (count > 1) | |
5158 | { | |
93ae6fdc | 5159 | errno = 0; |
da6d8c04 | 5160 | buffer[count - 1] |
95954743 | 5161 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
5162 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
5163 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5164 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 5165 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 5166 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
5167 | if (errno) |
5168 | return errno; | |
da6d8c04 DJ |
5169 | } |
5170 | ||
93ae6fdc | 5171 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 5172 | |
493e2a69 MS |
5173 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
5174 | myaddr, len); | |
da6d8c04 DJ |
5175 | |
5176 | /* Write the entire buffer. */ | |
5177 | ||
5178 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
5179 | { | |
5180 | errno = 0; | |
14ce3065 DE |
5181 | ptrace (PTRACE_POKETEXT, pid, |
5182 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5183 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5184 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5185 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
5186 | if (errno) |
5187 | return errno; | |
5188 | } | |
5189 | ||
5190 | return 0; | |
5191 | } | |
2f2893d9 DJ |
5192 | |
5193 | static void | |
5194 | linux_look_up_symbols (void) | |
5195 | { | |
0d62e5e8 | 5196 | #ifdef USE_THREAD_DB |
95954743 PA |
5197 | struct process_info *proc = current_process (); |
5198 | ||
fe978cb0 | 5199 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
5200 | return; |
5201 | ||
96d7229d LM |
5202 | /* If the kernel supports tracing clones, then we don't need to |
5203 | use the magic thread event breakpoint to learn about | |
5204 | threads. */ | |
5205 | thread_db_init (!linux_supports_traceclone ()); | |
0d62e5e8 DJ |
5206 | #endif |
5207 | } | |
5208 | ||
e5379b03 | 5209 | static void |
ef57601b | 5210 | linux_request_interrupt (void) |
e5379b03 | 5211 | { |
a1928bad | 5212 | extern unsigned long signal_pid; |
e5379b03 | 5213 | |
78708b7c PA |
5214 | /* Send a SIGINT to the process group. This acts just like the user |
5215 | typed a ^C on the controlling terminal. */ | |
5216 | kill (-signal_pid, SIGINT); | |
e5379b03 DJ |
5217 | } |
5218 | ||
aa691b87 RM |
5219 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
5220 | to debugger memory starting at MYADDR. */ | |
5221 | ||
5222 | static int | |
f450004a | 5223 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
5224 | { |
5225 | char filename[PATH_MAX]; | |
5226 | int fd, n; | |
0bfdf32f | 5227 | int pid = lwpid_of (current_thread); |
aa691b87 | 5228 | |
6cebaf6e | 5229 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
5230 | |
5231 | fd = open (filename, O_RDONLY); | |
5232 | if (fd < 0) | |
5233 | return -1; | |
5234 | ||
5235 | if (offset != (CORE_ADDR) 0 | |
5236 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5237 | n = -1; | |
5238 | else | |
5239 | n = read (fd, myaddr, len); | |
5240 | ||
5241 | close (fd); | |
5242 | ||
5243 | return n; | |
5244 | } | |
5245 | ||
d993e290 PA |
5246 | /* These breakpoint and watchpoint related wrapper functions simply |
5247 | pass on the function call if the target has registered a | |
5248 | corresponding function. */ | |
e013ee27 OF |
5249 | |
5250 | static int | |
802e8e6d PA |
5251 | linux_supports_z_point_type (char z_type) |
5252 | { | |
5253 | return (the_low_target.supports_z_point_type != NULL | |
5254 | && the_low_target.supports_z_point_type (z_type)); | |
5255 | } | |
5256 | ||
5257 | static int | |
5258 | linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5259 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5260 | { |
c8f4bfdd YQ |
5261 | if (type == raw_bkpt_type_sw) |
5262 | return insert_memory_breakpoint (bp); | |
5263 | else if (the_low_target.insert_point != NULL) | |
802e8e6d | 5264 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
5265 | else |
5266 | /* Unsupported (see target.h). */ | |
5267 | return 1; | |
5268 | } | |
5269 | ||
5270 | static int | |
802e8e6d PA |
5271 | linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
5272 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5273 | { |
c8f4bfdd YQ |
5274 | if (type == raw_bkpt_type_sw) |
5275 | return remove_memory_breakpoint (bp); | |
5276 | else if (the_low_target.remove_point != NULL) | |
802e8e6d | 5277 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
5278 | else |
5279 | /* Unsupported (see target.h). */ | |
5280 | return 1; | |
5281 | } | |
5282 | ||
3e572f71 PA |
5283 | /* Implement the to_stopped_by_sw_breakpoint target_ops |
5284 | method. */ | |
5285 | ||
5286 | static int | |
5287 | linux_stopped_by_sw_breakpoint (void) | |
5288 | { | |
5289 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5290 | ||
5291 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
5292 | } | |
5293 | ||
5294 | /* Implement the to_supports_stopped_by_sw_breakpoint target_ops | |
5295 | method. */ | |
5296 | ||
5297 | static int | |
5298 | linux_supports_stopped_by_sw_breakpoint (void) | |
5299 | { | |
5300 | return USE_SIGTRAP_SIGINFO; | |
5301 | } | |
5302 | ||
5303 | /* Implement the to_stopped_by_hw_breakpoint target_ops | |
5304 | method. */ | |
5305 | ||
5306 | static int | |
5307 | linux_stopped_by_hw_breakpoint (void) | |
5308 | { | |
5309 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5310 | ||
5311 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
5312 | } | |
5313 | ||
5314 | /* Implement the to_supports_stopped_by_hw_breakpoint target_ops | |
5315 | method. */ | |
5316 | ||
5317 | static int | |
5318 | linux_supports_stopped_by_hw_breakpoint (void) | |
5319 | { | |
5320 | return USE_SIGTRAP_SIGINFO; | |
5321 | } | |
5322 | ||
45614f15 YQ |
5323 | /* Implement the supports_conditional_breakpoints target_ops |
5324 | method. */ | |
5325 | ||
5326 | static int | |
5327 | linux_supports_conditional_breakpoints (void) | |
5328 | { | |
5329 | /* GDBserver needs to step over the breakpoint if the condition is | |
5330 | false. GDBserver software single step is too simple, so disable | |
5331 | conditional breakpoints if the target doesn't have hardware single | |
5332 | step. */ | |
5333 | return can_hardware_single_step (); | |
5334 | } | |
5335 | ||
e013ee27 OF |
5336 | static int |
5337 | linux_stopped_by_watchpoint (void) | |
5338 | { | |
0bfdf32f | 5339 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 5340 | |
15c66dd6 | 5341 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
5342 | } |
5343 | ||
5344 | static CORE_ADDR | |
5345 | linux_stopped_data_address (void) | |
5346 | { | |
0bfdf32f | 5347 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
5348 | |
5349 | return lwp->stopped_data_address; | |
e013ee27 OF |
5350 | } |
5351 | ||
db0dfaa0 LM |
5352 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
5353 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
5354 | && defined(PT_TEXT_END_ADDR) | |
5355 | ||
5356 | /* This is only used for targets that define PT_TEXT_ADDR, | |
5357 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
5358 | the target has different ways of acquiring this information, like | |
5359 | loadmaps. */ | |
52fb6437 NS |
5360 | |
5361 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
5362 | to tell gdb about. */ | |
5363 | ||
5364 | static int | |
5365 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
5366 | { | |
52fb6437 | 5367 | unsigned long text, text_end, data; |
62828379 | 5368 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
5369 | |
5370 | errno = 0; | |
5371 | ||
b8e1b30e LM |
5372 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
5373 | (PTRACE_TYPE_ARG4) 0); | |
5374 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
5375 | (PTRACE_TYPE_ARG4) 0); | |
5376 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
5377 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
5378 | |
5379 | if (errno == 0) | |
5380 | { | |
5381 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
5382 | used by gdb) are relative to the beginning of the program, |
5383 | with the data segment immediately following the text segment. | |
5384 | However, the actual runtime layout in memory may put the data | |
5385 | somewhere else, so when we send gdb a data base-address, we | |
5386 | use the real data base address and subtract the compile-time | |
5387 | data base-address from it (which is just the length of the | |
5388 | text segment). BSS immediately follows data in both | |
5389 | cases. */ | |
52fb6437 NS |
5390 | *text_p = text; |
5391 | *data_p = data - (text_end - text); | |
1b3f6016 | 5392 | |
52fb6437 NS |
5393 | return 1; |
5394 | } | |
52fb6437 NS |
5395 | return 0; |
5396 | } | |
5397 | #endif | |
5398 | ||
07e059b5 VP |
5399 | static int |
5400 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
5401 | unsigned char *readbuf, unsigned const char *writebuf, |
5402 | CORE_ADDR offset, int len) | |
07e059b5 | 5403 | { |
d26e3629 | 5404 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5405 | } |
5406 | ||
d0722149 DE |
5407 | /* Convert a native/host siginfo object, into/from the siginfo in the |
5408 | layout of the inferiors' architecture. */ | |
5409 | ||
5410 | static void | |
a5362b9a | 5411 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
5412 | { |
5413 | int done = 0; | |
5414 | ||
5415 | if (the_low_target.siginfo_fixup != NULL) | |
5416 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
5417 | ||
5418 | /* If there was no callback, or the callback didn't do anything, | |
5419 | then just do a straight memcpy. */ | |
5420 | if (!done) | |
5421 | { | |
5422 | if (direction == 1) | |
a5362b9a | 5423 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 5424 | else |
a5362b9a | 5425 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
5426 | } |
5427 | } | |
5428 | ||
4aa995e1 PA |
5429 | static int |
5430 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
5431 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
5432 | { | |
d0722149 | 5433 | int pid; |
a5362b9a TS |
5434 | siginfo_t siginfo; |
5435 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 | 5436 | |
0bfdf32f | 5437 | if (current_thread == NULL) |
4aa995e1 PA |
5438 | return -1; |
5439 | ||
0bfdf32f | 5440 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
5441 | |
5442 | if (debug_threads) | |
87ce2a04 DE |
5443 | debug_printf ("%s siginfo for lwp %d.\n", |
5444 | readbuf != NULL ? "Reading" : "Writing", | |
5445 | pid); | |
4aa995e1 | 5446 | |
0adea5f7 | 5447 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
5448 | return -1; |
5449 | ||
b8e1b30e | 5450 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5451 | return -1; |
5452 | ||
d0722149 DE |
5453 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
5454 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
5455 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
5456 | with a 32-bit GDBSERVER, we need to convert it. */ | |
5457 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
5458 | ||
4aa995e1 PA |
5459 | if (offset + len > sizeof (siginfo)) |
5460 | len = sizeof (siginfo) - offset; | |
5461 | ||
5462 | if (readbuf != NULL) | |
d0722149 | 5463 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
5464 | else |
5465 | { | |
d0722149 DE |
5466 | memcpy (inf_siginfo + offset, writebuf, len); |
5467 | ||
5468 | /* Convert back to ptrace layout before flushing it out. */ | |
5469 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
5470 | ||
b8e1b30e | 5471 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5472 | return -1; |
5473 | } | |
5474 | ||
5475 | return len; | |
5476 | } | |
5477 | ||
bd99dc85 PA |
5478 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5479 | so we notice when children change state; as the handler for the | |
5480 | sigsuspend in my_waitpid. */ | |
5481 | ||
5482 | static void | |
5483 | sigchld_handler (int signo) | |
5484 | { | |
5485 | int old_errno = errno; | |
5486 | ||
5487 | if (debug_threads) | |
e581f2b4 PA |
5488 | { |
5489 | do | |
5490 | { | |
5491 | /* fprintf is not async-signal-safe, so call write | |
5492 | directly. */ | |
5493 | if (write (2, "sigchld_handler\n", | |
5494 | sizeof ("sigchld_handler\n") - 1) < 0) | |
5495 | break; /* just ignore */ | |
5496 | } while (0); | |
5497 | } | |
bd99dc85 PA |
5498 | |
5499 | if (target_is_async_p ()) | |
5500 | async_file_mark (); /* trigger a linux_wait */ | |
5501 | ||
5502 | errno = old_errno; | |
5503 | } | |
5504 | ||
5505 | static int | |
5506 | linux_supports_non_stop (void) | |
5507 | { | |
5508 | return 1; | |
5509 | } | |
5510 | ||
5511 | static int | |
5512 | linux_async (int enable) | |
5513 | { | |
7089dca4 | 5514 | int previous = target_is_async_p (); |
bd99dc85 | 5515 | |
8336d594 | 5516 | if (debug_threads) |
87ce2a04 DE |
5517 | debug_printf ("linux_async (%d), previous=%d\n", |
5518 | enable, previous); | |
8336d594 | 5519 | |
bd99dc85 PA |
5520 | if (previous != enable) |
5521 | { | |
5522 | sigset_t mask; | |
5523 | sigemptyset (&mask); | |
5524 | sigaddset (&mask, SIGCHLD); | |
5525 | ||
5526 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
5527 | ||
5528 | if (enable) | |
5529 | { | |
5530 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
5531 | { |
5532 | linux_event_pipe[0] = -1; | |
5533 | linux_event_pipe[1] = -1; | |
5534 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5535 | ||
5536 | warning ("creating event pipe failed."); | |
5537 | return previous; | |
5538 | } | |
bd99dc85 PA |
5539 | |
5540 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5541 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5542 | ||
5543 | /* Register the event loop handler. */ | |
5544 | add_file_handler (linux_event_pipe[0], | |
5545 | handle_target_event, NULL); | |
5546 | ||
5547 | /* Always trigger a linux_wait. */ | |
5548 | async_file_mark (); | |
5549 | } | |
5550 | else | |
5551 | { | |
5552 | delete_file_handler (linux_event_pipe[0]); | |
5553 | ||
5554 | close (linux_event_pipe[0]); | |
5555 | close (linux_event_pipe[1]); | |
5556 | linux_event_pipe[0] = -1; | |
5557 | linux_event_pipe[1] = -1; | |
5558 | } | |
5559 | ||
5560 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5561 | } | |
5562 | ||
5563 | return previous; | |
5564 | } | |
5565 | ||
5566 | static int | |
5567 | linux_start_non_stop (int nonstop) | |
5568 | { | |
5569 | /* Register or unregister from event-loop accordingly. */ | |
5570 | linux_async (nonstop); | |
aa96c426 GB |
5571 | |
5572 | if (target_is_async_p () != (nonstop != 0)) | |
5573 | return -1; | |
5574 | ||
bd99dc85 PA |
5575 | return 0; |
5576 | } | |
5577 | ||
cf8fd78b PA |
5578 | static int |
5579 | linux_supports_multi_process (void) | |
5580 | { | |
5581 | return 1; | |
5582 | } | |
5583 | ||
89245bc0 DB |
5584 | /* Check if fork events are supported. */ |
5585 | ||
5586 | static int | |
5587 | linux_supports_fork_events (void) | |
5588 | { | |
5589 | return linux_supports_tracefork (); | |
5590 | } | |
5591 | ||
5592 | /* Check if vfork events are supported. */ | |
5593 | ||
5594 | static int | |
5595 | linux_supports_vfork_events (void) | |
5596 | { | |
5597 | return linux_supports_tracefork (); | |
5598 | } | |
5599 | ||
de0d863e DB |
5600 | /* Callback for 'find_inferior'. Set the (possibly changed) ptrace |
5601 | options for the specified lwp. */ | |
5602 | ||
5603 | static int | |
5604 | reset_lwp_ptrace_options_callback (struct inferior_list_entry *entry, | |
5605 | void *args) | |
5606 | { | |
5607 | struct thread_info *thread = (struct thread_info *) entry; | |
5608 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5609 | ||
5610 | if (!lwp->stopped) | |
5611 | { | |
5612 | /* Stop the lwp so we can modify its ptrace options. */ | |
5613 | lwp->must_set_ptrace_flags = 1; | |
5614 | linux_stop_lwp (lwp); | |
5615 | } | |
5616 | else | |
5617 | { | |
5618 | /* Already stopped; go ahead and set the ptrace options. */ | |
5619 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
5620 | int options = linux_low_ptrace_options (proc->attached); | |
5621 | ||
5622 | linux_enable_event_reporting (lwpid_of (thread), options); | |
5623 | lwp->must_set_ptrace_flags = 0; | |
5624 | } | |
5625 | ||
5626 | return 0; | |
5627 | } | |
5628 | ||
5629 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the | |
5630 | ptrace flags for all inferiors. This is in case the new GDB connection | |
5631 | doesn't support the same set of events that the previous one did. */ | |
5632 | ||
5633 | static void | |
5634 | linux_handle_new_gdb_connection (void) | |
5635 | { | |
5636 | pid_t pid; | |
5637 | ||
5638 | /* Request that all the lwps reset their ptrace options. */ | |
5639 | find_inferior (&all_threads, reset_lwp_ptrace_options_callback , &pid); | |
5640 | } | |
5641 | ||
03583c20 UW |
5642 | static int |
5643 | linux_supports_disable_randomization (void) | |
5644 | { | |
5645 | #ifdef HAVE_PERSONALITY | |
5646 | return 1; | |
5647 | #else | |
5648 | return 0; | |
5649 | #endif | |
5650 | } | |
efcbbd14 | 5651 | |
d1feda86 YQ |
5652 | static int |
5653 | linux_supports_agent (void) | |
5654 | { | |
5655 | return 1; | |
5656 | } | |
5657 | ||
c2d6af84 PA |
5658 | static int |
5659 | linux_supports_range_stepping (void) | |
5660 | { | |
5661 | if (*the_low_target.supports_range_stepping == NULL) | |
5662 | return 0; | |
5663 | ||
5664 | return (*the_low_target.supports_range_stepping) (); | |
5665 | } | |
5666 | ||
efcbbd14 UW |
5667 | /* Enumerate spufs IDs for process PID. */ |
5668 | static int | |
5669 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
5670 | { | |
5671 | int pos = 0; | |
5672 | int written = 0; | |
5673 | char path[128]; | |
5674 | DIR *dir; | |
5675 | struct dirent *entry; | |
5676 | ||
5677 | sprintf (path, "/proc/%ld/fd", pid); | |
5678 | dir = opendir (path); | |
5679 | if (!dir) | |
5680 | return -1; | |
5681 | ||
5682 | rewinddir (dir); | |
5683 | while ((entry = readdir (dir)) != NULL) | |
5684 | { | |
5685 | struct stat st; | |
5686 | struct statfs stfs; | |
5687 | int fd; | |
5688 | ||
5689 | fd = atoi (entry->d_name); | |
5690 | if (!fd) | |
5691 | continue; | |
5692 | ||
5693 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
5694 | if (stat (path, &st) != 0) | |
5695 | continue; | |
5696 | if (!S_ISDIR (st.st_mode)) | |
5697 | continue; | |
5698 | ||
5699 | if (statfs (path, &stfs) != 0) | |
5700 | continue; | |
5701 | if (stfs.f_type != SPUFS_MAGIC) | |
5702 | continue; | |
5703 | ||
5704 | if (pos >= offset && pos + 4 <= offset + len) | |
5705 | { | |
5706 | *(unsigned int *)(buf + pos - offset) = fd; | |
5707 | written += 4; | |
5708 | } | |
5709 | pos += 4; | |
5710 | } | |
5711 | ||
5712 | closedir (dir); | |
5713 | return written; | |
5714 | } | |
5715 | ||
5716 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5717 | object type, using the /proc file system. */ | |
5718 | static int | |
5719 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
5720 | unsigned const char *writebuf, | |
5721 | CORE_ADDR offset, int len) | |
5722 | { | |
0bfdf32f | 5723 | long pid = lwpid_of (current_thread); |
efcbbd14 UW |
5724 | char buf[128]; |
5725 | int fd = 0; | |
5726 | int ret = 0; | |
5727 | ||
5728 | if (!writebuf && !readbuf) | |
5729 | return -1; | |
5730 | ||
5731 | if (!*annex) | |
5732 | { | |
5733 | if (!readbuf) | |
5734 | return -1; | |
5735 | else | |
5736 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5737 | } | |
5738 | ||
5739 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5740 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5741 | if (fd <= 0) | |
5742 | return -1; | |
5743 | ||
5744 | if (offset != 0 | |
5745 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5746 | { | |
5747 | close (fd); | |
5748 | return 0; | |
5749 | } | |
5750 | ||
5751 | if (writebuf) | |
5752 | ret = write (fd, writebuf, (size_t) len); | |
5753 | else | |
5754 | ret = read (fd, readbuf, (size_t) len); | |
5755 | ||
5756 | close (fd); | |
5757 | return ret; | |
5758 | } | |
5759 | ||
723b724b | 5760 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5761 | struct target_loadseg |
5762 | { | |
5763 | /* Core address to which the segment is mapped. */ | |
5764 | Elf32_Addr addr; | |
5765 | /* VMA recorded in the program header. */ | |
5766 | Elf32_Addr p_vaddr; | |
5767 | /* Size of this segment in memory. */ | |
5768 | Elf32_Word p_memsz; | |
5769 | }; | |
5770 | ||
723b724b | 5771 | # if defined PT_GETDSBT |
78d85199 YQ |
5772 | struct target_loadmap |
5773 | { | |
5774 | /* Protocol version number, must be zero. */ | |
5775 | Elf32_Word version; | |
5776 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5777 | unsigned *dsbt_table; | |
5778 | unsigned dsbt_size, dsbt_index; | |
5779 | /* Number of segments in this map. */ | |
5780 | Elf32_Word nsegs; | |
5781 | /* The actual memory map. */ | |
5782 | struct target_loadseg segs[/*nsegs*/]; | |
5783 | }; | |
723b724b MF |
5784 | # define LINUX_LOADMAP PT_GETDSBT |
5785 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5786 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5787 | # else | |
5788 | struct target_loadmap | |
5789 | { | |
5790 | /* Protocol version number, must be zero. */ | |
5791 | Elf32_Half version; | |
5792 | /* Number of segments in this map. */ | |
5793 | Elf32_Half nsegs; | |
5794 | /* The actual memory map. */ | |
5795 | struct target_loadseg segs[/*nsegs*/]; | |
5796 | }; | |
5797 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5798 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5799 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5800 | # endif | |
78d85199 | 5801 | |
78d85199 YQ |
5802 | static int |
5803 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5804 | unsigned char *myaddr, unsigned int len) | |
5805 | { | |
0bfdf32f | 5806 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
5807 | int addr = -1; |
5808 | struct target_loadmap *data = NULL; | |
5809 | unsigned int actual_length, copy_length; | |
5810 | ||
5811 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5812 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5813 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5814 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5815 | else |
5816 | return -1; | |
5817 | ||
723b724b | 5818 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5819 | return -1; |
5820 | ||
5821 | if (data == NULL) | |
5822 | return -1; | |
5823 | ||
5824 | actual_length = sizeof (struct target_loadmap) | |
5825 | + sizeof (struct target_loadseg) * data->nsegs; | |
5826 | ||
5827 | if (offset < 0 || offset > actual_length) | |
5828 | return -1; | |
5829 | ||
5830 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5831 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5832 | return copy_length; | |
5833 | } | |
723b724b MF |
5834 | #else |
5835 | # define linux_read_loadmap NULL | |
5836 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5837 | |
1570b33e L |
5838 | static void |
5839 | linux_process_qsupported (const char *query) | |
5840 | { | |
5841 | if (the_low_target.process_qsupported != NULL) | |
5842 | the_low_target.process_qsupported (query); | |
5843 | } | |
5844 | ||
219f2f23 PA |
5845 | static int |
5846 | linux_supports_tracepoints (void) | |
5847 | { | |
5848 | if (*the_low_target.supports_tracepoints == NULL) | |
5849 | return 0; | |
5850 | ||
5851 | return (*the_low_target.supports_tracepoints) (); | |
5852 | } | |
5853 | ||
5854 | static CORE_ADDR | |
5855 | linux_read_pc (struct regcache *regcache) | |
5856 | { | |
5857 | if (the_low_target.get_pc == NULL) | |
5858 | return 0; | |
5859 | ||
5860 | return (*the_low_target.get_pc) (regcache); | |
5861 | } | |
5862 | ||
5863 | static void | |
5864 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5865 | { | |
5866 | gdb_assert (the_low_target.set_pc != NULL); | |
5867 | ||
5868 | (*the_low_target.set_pc) (regcache, pc); | |
5869 | } | |
5870 | ||
8336d594 PA |
5871 | static int |
5872 | linux_thread_stopped (struct thread_info *thread) | |
5873 | { | |
5874 | return get_thread_lwp (thread)->stopped; | |
5875 | } | |
5876 | ||
5877 | /* This exposes stop-all-threads functionality to other modules. */ | |
5878 | ||
5879 | static void | |
7984d532 | 5880 | linux_pause_all (int freeze) |
8336d594 | 5881 | { |
7984d532 PA |
5882 | stop_all_lwps (freeze, NULL); |
5883 | } | |
5884 | ||
5885 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5886 | modules. */ | |
5887 | ||
5888 | static void | |
5889 | linux_unpause_all (int unfreeze) | |
5890 | { | |
5891 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5892 | } |
5893 | ||
90d74c30 PA |
5894 | static int |
5895 | linux_prepare_to_access_memory (void) | |
5896 | { | |
5897 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5898 | running LWP. */ | |
5899 | if (non_stop) | |
5900 | linux_pause_all (1); | |
5901 | return 0; | |
5902 | } | |
5903 | ||
5904 | static void | |
0146f85b | 5905 | linux_done_accessing_memory (void) |
90d74c30 PA |
5906 | { |
5907 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5908 | running LWP. */ | |
5909 | if (non_stop) | |
5910 | linux_unpause_all (1); | |
5911 | } | |
5912 | ||
fa593d66 PA |
5913 | static int |
5914 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5915 | CORE_ADDR collector, | |
5916 | CORE_ADDR lockaddr, | |
5917 | ULONGEST orig_size, | |
5918 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5919 | CORE_ADDR *trampoline, |
5920 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5921 | unsigned char *jjump_pad_insn, |
5922 | ULONGEST *jjump_pad_insn_size, | |
5923 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5924 | CORE_ADDR *adjusted_insn_addr_end, |
5925 | char *err) | |
fa593d66 PA |
5926 | { |
5927 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5928 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5929 | jump_entry, trampoline, trampoline_size, |
5930 | jjump_pad_insn, jjump_pad_insn_size, | |
5931 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5932 | err); | |
fa593d66 PA |
5933 | } |
5934 | ||
6a271cae PA |
5935 | static struct emit_ops * |
5936 | linux_emit_ops (void) | |
5937 | { | |
5938 | if (the_low_target.emit_ops != NULL) | |
5939 | return (*the_low_target.emit_ops) (); | |
5940 | else | |
5941 | return NULL; | |
5942 | } | |
5943 | ||
405f8e94 SS |
5944 | static int |
5945 | linux_get_min_fast_tracepoint_insn_len (void) | |
5946 | { | |
5947 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5948 | } | |
5949 | ||
2268b414 JK |
5950 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5951 | ||
5952 | static int | |
5953 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5954 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5955 | { | |
5956 | char filename[PATH_MAX]; | |
5957 | int fd; | |
5958 | const int auxv_size = is_elf64 | |
5959 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5960 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5961 | ||
5962 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5963 | ||
5964 | fd = open (filename, O_RDONLY); | |
5965 | if (fd < 0) | |
5966 | return 1; | |
5967 | ||
5968 | *phdr_memaddr = 0; | |
5969 | *num_phdr = 0; | |
5970 | while (read (fd, buf, auxv_size) == auxv_size | |
5971 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5972 | { | |
5973 | if (is_elf64) | |
5974 | { | |
5975 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5976 | ||
5977 | switch (aux->a_type) | |
5978 | { | |
5979 | case AT_PHDR: | |
5980 | *phdr_memaddr = aux->a_un.a_val; | |
5981 | break; | |
5982 | case AT_PHNUM: | |
5983 | *num_phdr = aux->a_un.a_val; | |
5984 | break; | |
5985 | } | |
5986 | } | |
5987 | else | |
5988 | { | |
5989 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5990 | ||
5991 | switch (aux->a_type) | |
5992 | { | |
5993 | case AT_PHDR: | |
5994 | *phdr_memaddr = aux->a_un.a_val; | |
5995 | break; | |
5996 | case AT_PHNUM: | |
5997 | *num_phdr = aux->a_un.a_val; | |
5998 | break; | |
5999 | } | |
6000 | } | |
6001 | } | |
6002 | ||
6003 | close (fd); | |
6004 | ||
6005 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6006 | { | |
6007 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6008 | "phdr_memaddr = %ld, phdr_num = %d", | |
6009 | (long) *phdr_memaddr, *num_phdr); | |
6010 | return 2; | |
6011 | } | |
6012 | ||
6013 | return 0; | |
6014 | } | |
6015 | ||
6016 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6017 | ||
6018 | static CORE_ADDR | |
6019 | get_dynamic (const int pid, const int is_elf64) | |
6020 | { | |
6021 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6022 | int num_phdr, i; |
2268b414 | 6023 | unsigned char *phdr_buf; |
db1ff28b | 6024 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6025 | |
6026 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6027 | return 0; | |
6028 | ||
6029 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
6030 | phdr_buf = alloca (num_phdr * phdr_size); | |
6031 | ||
6032 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6033 | return 0; | |
6034 | ||
6035 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6036 | non-zero for PIE ones. */ | |
6037 | relocation = -1; | |
db1ff28b JK |
6038 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6039 | if (is_elf64) | |
6040 | { | |
6041 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6042 | ||
6043 | if (p->p_type == PT_PHDR) | |
6044 | relocation = phdr_memaddr - p->p_vaddr; | |
6045 | } | |
6046 | else | |
6047 | { | |
6048 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6049 | ||
6050 | if (p->p_type == PT_PHDR) | |
6051 | relocation = phdr_memaddr - p->p_vaddr; | |
6052 | } | |
6053 | ||
2268b414 JK |
6054 | if (relocation == -1) |
6055 | { | |
e237a7e2 JK |
6056 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6057 | any real world executables, including PIE executables, have always | |
6058 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6059 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6060 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6061 | ||
6062 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6063 | ||
6064 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6065 | ||
2268b414 JK |
6066 | return 0; |
6067 | } | |
6068 | ||
db1ff28b JK |
6069 | for (i = 0; i < num_phdr; i++) |
6070 | { | |
6071 | if (is_elf64) | |
6072 | { | |
6073 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6074 | ||
6075 | if (p->p_type == PT_DYNAMIC) | |
6076 | return p->p_vaddr + relocation; | |
6077 | } | |
6078 | else | |
6079 | { | |
6080 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6081 | |
db1ff28b JK |
6082 | if (p->p_type == PT_DYNAMIC) |
6083 | return p->p_vaddr + relocation; | |
6084 | } | |
6085 | } | |
2268b414 JK |
6086 | |
6087 | return 0; | |
6088 | } | |
6089 | ||
6090 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6091 | can be 0 if the inferior does not yet have the library list initialized. |
6092 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6093 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6094 | |
6095 | static CORE_ADDR | |
6096 | get_r_debug (const int pid, const int is_elf64) | |
6097 | { | |
6098 | CORE_ADDR dynamic_memaddr; | |
6099 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6100 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6101 | CORE_ADDR map = -1; |
2268b414 JK |
6102 | |
6103 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6104 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6105 | return map; |
2268b414 JK |
6106 | |
6107 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6108 | { | |
6109 | if (is_elf64) | |
6110 | { | |
6111 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
75f62ce7 | 6112 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
6113 | union |
6114 | { | |
6115 | Elf64_Xword map; | |
6116 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6117 | } | |
6118 | rld_map; | |
6119 | ||
6120 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
6121 | { | |
6122 | if (linux_read_memory (dyn->d_un.d_val, | |
6123 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6124 | return rld_map.map; | |
6125 | else | |
6126 | break; | |
6127 | } | |
75f62ce7 | 6128 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 6129 | |
367ba2c2 MR |
6130 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6131 | map = dyn->d_un.d_val; | |
2268b414 JK |
6132 | |
6133 | if (dyn->d_tag == DT_NULL) | |
6134 | break; | |
6135 | } | |
6136 | else | |
6137 | { | |
6138 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
75f62ce7 | 6139 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
6140 | union |
6141 | { | |
6142 | Elf32_Word map; | |
6143 | unsigned char buf[sizeof (Elf32_Word)]; | |
6144 | } | |
6145 | rld_map; | |
6146 | ||
6147 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
6148 | { | |
6149 | if (linux_read_memory (dyn->d_un.d_val, | |
6150 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6151 | return rld_map.map; | |
6152 | else | |
6153 | break; | |
6154 | } | |
75f62ce7 | 6155 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 6156 | |
367ba2c2 MR |
6157 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6158 | map = dyn->d_un.d_val; | |
2268b414 JK |
6159 | |
6160 | if (dyn->d_tag == DT_NULL) | |
6161 | break; | |
6162 | } | |
6163 | ||
6164 | dynamic_memaddr += dyn_size; | |
6165 | } | |
6166 | ||
367ba2c2 | 6167 | return map; |
2268b414 JK |
6168 | } |
6169 | ||
6170 | /* Read one pointer from MEMADDR in the inferior. */ | |
6171 | ||
6172 | static int | |
6173 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
6174 | { | |
485f1ee4 PA |
6175 | int ret; |
6176 | ||
6177 | /* Go through a union so this works on either big or little endian | |
6178 | hosts, when the inferior's pointer size is smaller than the size | |
6179 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
6180 | same of the superior's. */ | |
6181 | union | |
6182 | { | |
6183 | CORE_ADDR core_addr; | |
6184 | unsigned int ui; | |
6185 | unsigned char uc; | |
6186 | } addr; | |
6187 | ||
6188 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
6189 | if (ret == 0) | |
6190 | { | |
6191 | if (ptr_size == sizeof (CORE_ADDR)) | |
6192 | *ptr = addr.core_addr; | |
6193 | else if (ptr_size == sizeof (unsigned int)) | |
6194 | *ptr = addr.ui; | |
6195 | else | |
6196 | gdb_assert_not_reached ("unhandled pointer size"); | |
6197 | } | |
6198 | return ret; | |
2268b414 JK |
6199 | } |
6200 | ||
6201 | struct link_map_offsets | |
6202 | { | |
6203 | /* Offset and size of r_debug.r_version. */ | |
6204 | int r_version_offset; | |
6205 | ||
6206 | /* Offset and size of r_debug.r_map. */ | |
6207 | int r_map_offset; | |
6208 | ||
6209 | /* Offset to l_addr field in struct link_map. */ | |
6210 | int l_addr_offset; | |
6211 | ||
6212 | /* Offset to l_name field in struct link_map. */ | |
6213 | int l_name_offset; | |
6214 | ||
6215 | /* Offset to l_ld field in struct link_map. */ | |
6216 | int l_ld_offset; | |
6217 | ||
6218 | /* Offset to l_next field in struct link_map. */ | |
6219 | int l_next_offset; | |
6220 | ||
6221 | /* Offset to l_prev field in struct link_map. */ | |
6222 | int l_prev_offset; | |
6223 | }; | |
6224 | ||
fb723180 | 6225 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
6226 | |
6227 | static int | |
6228 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
6229 | unsigned const char *writebuf, | |
6230 | CORE_ADDR offset, int len) | |
6231 | { | |
6232 | char *document; | |
6233 | unsigned document_len; | |
fe978cb0 | 6234 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
6235 | char filename[PATH_MAX]; |
6236 | int pid, is_elf64; | |
6237 | ||
6238 | static const struct link_map_offsets lmo_32bit_offsets = | |
6239 | { | |
6240 | 0, /* r_version offset. */ | |
6241 | 4, /* r_debug.r_map offset. */ | |
6242 | 0, /* l_addr offset in link_map. */ | |
6243 | 4, /* l_name offset in link_map. */ | |
6244 | 8, /* l_ld offset in link_map. */ | |
6245 | 12, /* l_next offset in link_map. */ | |
6246 | 16 /* l_prev offset in link_map. */ | |
6247 | }; | |
6248 | ||
6249 | static const struct link_map_offsets lmo_64bit_offsets = | |
6250 | { | |
6251 | 0, /* r_version offset. */ | |
6252 | 8, /* r_debug.r_map offset. */ | |
6253 | 0, /* l_addr offset in link_map. */ | |
6254 | 8, /* l_name offset in link_map. */ | |
6255 | 16, /* l_ld offset in link_map. */ | |
6256 | 24, /* l_next offset in link_map. */ | |
6257 | 32 /* l_prev offset in link_map. */ | |
6258 | }; | |
6259 | const struct link_map_offsets *lmo; | |
214d508e | 6260 | unsigned int machine; |
b1fbec62 GB |
6261 | int ptr_size; |
6262 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
6263 | int allocated = 1024; | |
6264 | char *p; | |
6265 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
6266 | int header_done = 0; | |
2268b414 JK |
6267 | |
6268 | if (writebuf != NULL) | |
6269 | return -2; | |
6270 | if (readbuf == NULL) | |
6271 | return -1; | |
6272 | ||
0bfdf32f | 6273 | pid = lwpid_of (current_thread); |
2268b414 | 6274 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 6275 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 6276 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 6277 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 6278 | |
b1fbec62 GB |
6279 | while (annex[0] != '\0') |
6280 | { | |
6281 | const char *sep; | |
6282 | CORE_ADDR *addrp; | |
6283 | int len; | |
2268b414 | 6284 | |
b1fbec62 GB |
6285 | sep = strchr (annex, '='); |
6286 | if (sep == NULL) | |
6287 | break; | |
0c5bf5a9 | 6288 | |
b1fbec62 | 6289 | len = sep - annex; |
61012eef | 6290 | if (len == 5 && startswith (annex, "start")) |
b1fbec62 | 6291 | addrp = &lm_addr; |
61012eef | 6292 | else if (len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
6293 | addrp = &lm_prev; |
6294 | else | |
6295 | { | |
6296 | annex = strchr (sep, ';'); | |
6297 | if (annex == NULL) | |
6298 | break; | |
6299 | annex++; | |
6300 | continue; | |
6301 | } | |
6302 | ||
6303 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 6304 | } |
b1fbec62 GB |
6305 | |
6306 | if (lm_addr == 0) | |
2268b414 | 6307 | { |
b1fbec62 GB |
6308 | int r_version = 0; |
6309 | ||
6310 | if (priv->r_debug == 0) | |
6311 | priv->r_debug = get_r_debug (pid, is_elf64); | |
6312 | ||
6313 | /* We failed to find DT_DEBUG. Such situation will not change | |
6314 | for this inferior - do not retry it. Report it to GDB as | |
6315 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
6316 | if (priv->r_debug == (CORE_ADDR) -1) | |
6317 | return -1; | |
6318 | ||
6319 | if (priv->r_debug != 0) | |
2268b414 | 6320 | { |
b1fbec62 GB |
6321 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
6322 | (unsigned char *) &r_version, | |
6323 | sizeof (r_version)) != 0 | |
6324 | || r_version != 1) | |
6325 | { | |
6326 | warning ("unexpected r_debug version %d", r_version); | |
6327 | } | |
6328 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
6329 | &lm_addr, ptr_size) != 0) | |
6330 | { | |
6331 | warning ("unable to read r_map from 0x%lx", | |
6332 | (long) priv->r_debug + lmo->r_map_offset); | |
6333 | } | |
2268b414 | 6334 | } |
b1fbec62 | 6335 | } |
2268b414 | 6336 | |
b1fbec62 GB |
6337 | document = xmalloc (allocated); |
6338 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
6339 | p = document + strlen (document); | |
6340 | ||
6341 | while (lm_addr | |
6342 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
6343 | &l_name, ptr_size) == 0 | |
6344 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
6345 | &l_addr, ptr_size) == 0 | |
6346 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
6347 | &l_ld, ptr_size) == 0 | |
6348 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
6349 | &l_prev, ptr_size) == 0 | |
6350 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
6351 | &l_next, ptr_size) == 0) | |
6352 | { | |
6353 | unsigned char libname[PATH_MAX]; | |
6354 | ||
6355 | if (lm_prev != l_prev) | |
2268b414 | 6356 | { |
b1fbec62 GB |
6357 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
6358 | (long) lm_prev, (long) l_prev); | |
6359 | break; | |
2268b414 JK |
6360 | } |
6361 | ||
d878444c JK |
6362 | /* Ignore the first entry even if it has valid name as the first entry |
6363 | corresponds to the main executable. The first entry should not be | |
6364 | skipped if the dynamic loader was loaded late by a static executable | |
6365 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
6366 | executable does not have PT_DYNAMIC present and this function already | |
6367 | exited above due to failed get_r_debug. */ | |
6368 | if (lm_prev == 0) | |
2268b414 | 6369 | { |
d878444c JK |
6370 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
6371 | p = p + strlen (p); | |
6372 | } | |
6373 | else | |
6374 | { | |
6375 | /* Not checking for error because reading may stop before | |
6376 | we've got PATH_MAX worth of characters. */ | |
6377 | libname[0] = '\0'; | |
6378 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
6379 | libname[sizeof (libname) - 1] = '\0'; | |
6380 | if (libname[0] != '\0') | |
2268b414 | 6381 | { |
d878444c JK |
6382 | /* 6x the size for xml_escape_text below. */ |
6383 | size_t len = 6 * strlen ((char *) libname); | |
6384 | char *name; | |
2268b414 | 6385 | |
d878444c JK |
6386 | if (!header_done) |
6387 | { | |
6388 | /* Terminate `<library-list-svr4'. */ | |
6389 | *p++ = '>'; | |
6390 | header_done = 1; | |
6391 | } | |
2268b414 | 6392 | |
db1ff28b | 6393 | while (allocated < p - document + len + 200) |
d878444c JK |
6394 | { |
6395 | /* Expand to guarantee sufficient storage. */ | |
6396 | uintptr_t document_len = p - document; | |
2268b414 | 6397 | |
d878444c JK |
6398 | document = xrealloc (document, 2 * allocated); |
6399 | allocated *= 2; | |
6400 | p = document + document_len; | |
6401 | } | |
6402 | ||
6403 | name = xml_escape_text ((char *) libname); | |
6404 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
db1ff28b | 6405 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", |
d878444c JK |
6406 | name, (unsigned long) lm_addr, |
6407 | (unsigned long) l_addr, (unsigned long) l_ld); | |
6408 | free (name); | |
6409 | } | |
0afae3cf | 6410 | } |
b1fbec62 GB |
6411 | |
6412 | lm_prev = lm_addr; | |
6413 | lm_addr = l_next; | |
2268b414 JK |
6414 | } |
6415 | ||
b1fbec62 GB |
6416 | if (!header_done) |
6417 | { | |
6418 | /* Empty list; terminate `<library-list-svr4'. */ | |
6419 | strcpy (p, "/>"); | |
6420 | } | |
6421 | else | |
6422 | strcpy (p, "</library-list-svr4>"); | |
6423 | ||
2268b414 JK |
6424 | document_len = strlen (document); |
6425 | if (offset < document_len) | |
6426 | document_len -= offset; | |
6427 | else | |
6428 | document_len = 0; | |
6429 | if (len > document_len) | |
6430 | len = document_len; | |
6431 | ||
6432 | memcpy (readbuf, document + offset, len); | |
6433 | xfree (document); | |
6434 | ||
6435 | return len; | |
6436 | } | |
6437 | ||
9accd112 MM |
6438 | #ifdef HAVE_LINUX_BTRACE |
6439 | ||
969c39fb | 6440 | /* See to_enable_btrace target method. */ |
9accd112 MM |
6441 | |
6442 | static struct btrace_target_info * | |
f4abbc16 | 6443 | linux_low_enable_btrace (ptid_t ptid, const struct btrace_config *conf) |
9accd112 MM |
6444 | { |
6445 | struct btrace_target_info *tinfo; | |
6446 | ||
f4abbc16 | 6447 | tinfo = linux_enable_btrace (ptid, conf); |
3aee8918 | 6448 | |
d68e53f4 | 6449 | if (tinfo != NULL && tinfo->ptr_bits == 0) |
3aee8918 PA |
6450 | { |
6451 | struct thread_info *thread = find_thread_ptid (ptid); | |
6452 | struct regcache *regcache = get_thread_regcache (thread, 0); | |
6453 | ||
6454 | tinfo->ptr_bits = register_size (regcache->tdesc, 0) * 8; | |
6455 | } | |
9accd112 MM |
6456 | |
6457 | return tinfo; | |
6458 | } | |
6459 | ||
969c39fb | 6460 | /* See to_disable_btrace target method. */ |
9accd112 | 6461 | |
969c39fb MM |
6462 | static int |
6463 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
6464 | { | |
6465 | enum btrace_error err; | |
6466 | ||
6467 | err = linux_disable_btrace (tinfo); | |
6468 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
6469 | } | |
6470 | ||
b20a6524 MM |
6471 | /* Encode an Intel(R) Processor Trace configuration. */ |
6472 | ||
6473 | static void | |
6474 | linux_low_encode_pt_config (struct buffer *buffer, | |
6475 | const struct btrace_data_pt_config *config) | |
6476 | { | |
6477 | buffer_grow_str (buffer, "<pt-config>\n"); | |
6478 | ||
6479 | switch (config->cpu.vendor) | |
6480 | { | |
6481 | case CV_INTEL: | |
6482 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
6483 | "model=\"%u\" stepping=\"%u\"/>\n", | |
6484 | config->cpu.family, config->cpu.model, | |
6485 | config->cpu.stepping); | |
6486 | break; | |
6487 | ||
6488 | default: | |
6489 | break; | |
6490 | } | |
6491 | ||
6492 | buffer_grow_str (buffer, "</pt-config>\n"); | |
6493 | } | |
6494 | ||
6495 | /* Encode a raw buffer. */ | |
6496 | ||
6497 | static void | |
6498 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
6499 | unsigned int size) | |
6500 | { | |
6501 | if (size == 0) | |
6502 | return; | |
6503 | ||
6504 | /* We use hex encoding - see common/rsp-low.h. */ | |
6505 | buffer_grow_str (buffer, "<raw>\n"); | |
6506 | ||
6507 | while (size-- > 0) | |
6508 | { | |
6509 | char elem[2]; | |
6510 | ||
6511 | elem[0] = tohex ((*data >> 4) & 0xf); | |
6512 | elem[1] = tohex (*data++ & 0xf); | |
6513 | ||
6514 | buffer_grow (buffer, elem, 2); | |
6515 | } | |
6516 | ||
6517 | buffer_grow_str (buffer, "</raw>\n"); | |
6518 | } | |
6519 | ||
969c39fb MM |
6520 | /* See to_read_btrace target method. */ |
6521 | ||
6522 | static int | |
9accd112 MM |
6523 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
6524 | int type) | |
6525 | { | |
734b0e4b | 6526 | struct btrace_data btrace; |
9accd112 | 6527 | struct btrace_block *block; |
969c39fb | 6528 | enum btrace_error err; |
9accd112 MM |
6529 | int i; |
6530 | ||
734b0e4b MM |
6531 | btrace_data_init (&btrace); |
6532 | ||
969c39fb MM |
6533 | err = linux_read_btrace (&btrace, tinfo, type); |
6534 | if (err != BTRACE_ERR_NONE) | |
6535 | { | |
6536 | if (err == BTRACE_ERR_OVERFLOW) | |
6537 | buffer_grow_str0 (buffer, "E.Overflow."); | |
6538 | else | |
6539 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
6540 | ||
b20a6524 | 6541 | goto err; |
969c39fb | 6542 | } |
9accd112 | 6543 | |
734b0e4b MM |
6544 | switch (btrace.format) |
6545 | { | |
6546 | case BTRACE_FORMAT_NONE: | |
6547 | buffer_grow_str0 (buffer, "E.No Trace."); | |
b20a6524 | 6548 | goto err; |
734b0e4b MM |
6549 | |
6550 | case BTRACE_FORMAT_BTS: | |
6551 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6552 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 6553 | |
734b0e4b MM |
6554 | for (i = 0; |
6555 | VEC_iterate (btrace_block_s, btrace.variant.bts.blocks, i, block); | |
6556 | i++) | |
6557 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
6558 | paddress (block->begin), paddress (block->end)); | |
9accd112 | 6559 | |
734b0e4b MM |
6560 | buffer_grow_str0 (buffer, "</btrace>\n"); |
6561 | break; | |
6562 | ||
b20a6524 MM |
6563 | case BTRACE_FORMAT_PT: |
6564 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6565 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
6566 | buffer_grow_str (buffer, "<pt>\n"); | |
6567 | ||
6568 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 6569 | |
b20a6524 MM |
6570 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
6571 | btrace.variant.pt.size); | |
6572 | ||
6573 | buffer_grow_str (buffer, "</pt>\n"); | |
6574 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
6575 | break; | |
6576 | ||
6577 | default: | |
6578 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
6579 | goto err; | |
734b0e4b | 6580 | } |
969c39fb | 6581 | |
734b0e4b | 6582 | btrace_data_fini (&btrace); |
969c39fb | 6583 | return 0; |
b20a6524 MM |
6584 | |
6585 | err: | |
6586 | btrace_data_fini (&btrace); | |
6587 | return -1; | |
9accd112 | 6588 | } |
f4abbc16 MM |
6589 | |
6590 | /* See to_btrace_conf target method. */ | |
6591 | ||
6592 | static int | |
6593 | linux_low_btrace_conf (const struct btrace_target_info *tinfo, | |
6594 | struct buffer *buffer) | |
6595 | { | |
6596 | const struct btrace_config *conf; | |
6597 | ||
6598 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
6599 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
6600 | ||
6601 | conf = linux_btrace_conf (tinfo); | |
6602 | if (conf != NULL) | |
6603 | { | |
6604 | switch (conf->format) | |
6605 | { | |
6606 | case BTRACE_FORMAT_NONE: | |
6607 | break; | |
6608 | ||
6609 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
6610 | buffer_xml_printf (buffer, "<bts"); |
6611 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
6612 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 6613 | break; |
b20a6524 MM |
6614 | |
6615 | case BTRACE_FORMAT_PT: | |
6616 | buffer_xml_printf (buffer, "<pt"); | |
6617 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
6618 | buffer_xml_printf (buffer, "/>\n"); | |
6619 | break; | |
f4abbc16 MM |
6620 | } |
6621 | } | |
6622 | ||
6623 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
6624 | return 0; | |
6625 | } | |
9accd112 MM |
6626 | #endif /* HAVE_LINUX_BTRACE */ |
6627 | ||
7b669087 GB |
6628 | /* See nat/linux-nat.h. */ |
6629 | ||
6630 | ptid_t | |
6631 | current_lwp_ptid (void) | |
6632 | { | |
6633 | return ptid_of (current_thread); | |
6634 | } | |
6635 | ||
ce3a066d DJ |
6636 | static struct target_ops linux_target_ops = { |
6637 | linux_create_inferior, | |
6638 | linux_attach, | |
6639 | linux_kill, | |
6ad8ae5c | 6640 | linux_detach, |
8336d594 | 6641 | linux_mourn, |
444d6139 | 6642 | linux_join, |
ce3a066d DJ |
6643 | linux_thread_alive, |
6644 | linux_resume, | |
6645 | linux_wait, | |
6646 | linux_fetch_registers, | |
6647 | linux_store_registers, | |
90d74c30 | 6648 | linux_prepare_to_access_memory, |
0146f85b | 6649 | linux_done_accessing_memory, |
ce3a066d DJ |
6650 | linux_read_memory, |
6651 | linux_write_memory, | |
2f2893d9 | 6652 | linux_look_up_symbols, |
ef57601b | 6653 | linux_request_interrupt, |
aa691b87 | 6654 | linux_read_auxv, |
802e8e6d | 6655 | linux_supports_z_point_type, |
d993e290 PA |
6656 | linux_insert_point, |
6657 | linux_remove_point, | |
3e572f71 PA |
6658 | linux_stopped_by_sw_breakpoint, |
6659 | linux_supports_stopped_by_sw_breakpoint, | |
6660 | linux_stopped_by_hw_breakpoint, | |
6661 | linux_supports_stopped_by_hw_breakpoint, | |
45614f15 | 6662 | linux_supports_conditional_breakpoints, |
e013ee27 OF |
6663 | linux_stopped_by_watchpoint, |
6664 | linux_stopped_data_address, | |
db0dfaa0 LM |
6665 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
6666 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
6667 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 6668 | linux_read_offsets, |
dae5f5cf DJ |
6669 | #else |
6670 | NULL, | |
6671 | #endif | |
6672 | #ifdef USE_THREAD_DB | |
6673 | thread_db_get_tls_address, | |
6674 | #else | |
6675 | NULL, | |
52fb6437 | 6676 | #endif |
efcbbd14 | 6677 | linux_qxfer_spu, |
59a016f0 | 6678 | hostio_last_error_from_errno, |
07e059b5 | 6679 | linux_qxfer_osdata, |
4aa995e1 | 6680 | linux_xfer_siginfo, |
bd99dc85 PA |
6681 | linux_supports_non_stop, |
6682 | linux_async, | |
6683 | linux_start_non_stop, | |
cdbfd419 | 6684 | linux_supports_multi_process, |
89245bc0 DB |
6685 | linux_supports_fork_events, |
6686 | linux_supports_vfork_events, | |
de0d863e | 6687 | linux_handle_new_gdb_connection, |
cdbfd419 | 6688 | #ifdef USE_THREAD_DB |
dc146f7c | 6689 | thread_db_handle_monitor_command, |
cdbfd419 | 6690 | #else |
dc146f7c | 6691 | NULL, |
cdbfd419 | 6692 | #endif |
d26e3629 | 6693 | linux_common_core_of_thread, |
78d85199 | 6694 | linux_read_loadmap, |
219f2f23 PA |
6695 | linux_process_qsupported, |
6696 | linux_supports_tracepoints, | |
6697 | linux_read_pc, | |
8336d594 PA |
6698 | linux_write_pc, |
6699 | linux_thread_stopped, | |
7984d532 | 6700 | NULL, |
711e434b | 6701 | linux_pause_all, |
7984d532 | 6702 | linux_unpause_all, |
fa593d66 | 6703 | linux_stabilize_threads, |
6a271cae | 6704 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
6705 | linux_emit_ops, |
6706 | linux_supports_disable_randomization, | |
405f8e94 | 6707 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 6708 | linux_qxfer_libraries_svr4, |
d1feda86 | 6709 | linux_supports_agent, |
9accd112 MM |
6710 | #ifdef HAVE_LINUX_BTRACE |
6711 | linux_supports_btrace, | |
6712 | linux_low_enable_btrace, | |
969c39fb | 6713 | linux_low_disable_btrace, |
9accd112 | 6714 | linux_low_read_btrace, |
f4abbc16 | 6715 | linux_low_btrace_conf, |
9accd112 MM |
6716 | #else |
6717 | NULL, | |
6718 | NULL, | |
6719 | NULL, | |
6720 | NULL, | |
f4abbc16 | 6721 | NULL, |
9accd112 | 6722 | #endif |
c2d6af84 | 6723 | linux_supports_range_stepping, |
e57f1de3 | 6724 | linux_proc_pid_to_exec_file, |
14d2069a GB |
6725 | linux_mntns_open_cloexec, |
6726 | linux_mntns_unlink, | |
6727 | linux_mntns_readlink, | |
ce3a066d DJ |
6728 | }; |
6729 | ||
0d62e5e8 DJ |
6730 | static void |
6731 | linux_init_signals () | |
6732 | { | |
6733 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
6734 | to find what the cancel signal actually is. */ | |
1a981360 | 6735 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 6736 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 6737 | #endif |
0d62e5e8 DJ |
6738 | } |
6739 | ||
3aee8918 PA |
6740 | #ifdef HAVE_LINUX_REGSETS |
6741 | void | |
6742 | initialize_regsets_info (struct regsets_info *info) | |
6743 | { | |
6744 | for (info->num_regsets = 0; | |
6745 | info->regsets[info->num_regsets].size >= 0; | |
6746 | info->num_regsets++) | |
6747 | ; | |
3aee8918 PA |
6748 | } |
6749 | #endif | |
6750 | ||
da6d8c04 DJ |
6751 | void |
6752 | initialize_low (void) | |
6753 | { | |
bd99dc85 PA |
6754 | struct sigaction sigchld_action; |
6755 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 6756 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
6757 | set_breakpoint_data (the_low_target.breakpoint, |
6758 | the_low_target.breakpoint_len); | |
0d62e5e8 | 6759 | linux_init_signals (); |
aa7c7447 | 6760 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
6761 | |
6762 | sigchld_action.sa_handler = sigchld_handler; | |
6763 | sigemptyset (&sigchld_action.sa_mask); | |
6764 | sigchld_action.sa_flags = SA_RESTART; | |
6765 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
6766 | |
6767 | initialize_low_arch (); | |
89245bc0 DB |
6768 | |
6769 | linux_check_ptrace_features (); | |
da6d8c04 | 6770 | } |