Commit | Line | Data |
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3993f6b1 | 1 | /* GNU/Linux native-dependent code common to multiple platforms. |
dba24537 | 2 | |
618f726f | 3 | Copyright (C) 2001-2016 Free Software Foundation, Inc. |
3993f6b1 DJ |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
3993f6b1 DJ |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
3993f6b1 DJ |
19 | |
20 | #include "defs.h" | |
21 | #include "inferior.h" | |
45741a9c | 22 | #include "infrun.h" |
3993f6b1 | 23 | #include "target.h" |
96d7229d LM |
24 | #include "nat/linux-nat.h" |
25 | #include "nat/linux-waitpid.h" | |
3993f6b1 | 26 | #include "gdb_wait.h" |
d6b0e80f AC |
27 | #include <unistd.h> |
28 | #include <sys/syscall.h> | |
5826e159 | 29 | #include "nat/gdb_ptrace.h" |
0274a8ce | 30 | #include "linux-nat.h" |
125f8a3d GB |
31 | #include "nat/linux-ptrace.h" |
32 | #include "nat/linux-procfs.h" | |
8cc73a39 | 33 | #include "nat/linux-personality.h" |
ac264b3b | 34 | #include "linux-fork.h" |
d6b0e80f AC |
35 | #include "gdbthread.h" |
36 | #include "gdbcmd.h" | |
37 | #include "regcache.h" | |
4f844a66 | 38 | #include "regset.h" |
dab06dbe | 39 | #include "inf-child.h" |
10d6c8cd DJ |
40 | #include "inf-ptrace.h" |
41 | #include "auxv.h" | |
1777feb0 | 42 | #include <sys/procfs.h> /* for elf_gregset etc. */ |
dba24537 AC |
43 | #include "elf-bfd.h" /* for elfcore_write_* */ |
44 | #include "gregset.h" /* for gregset */ | |
45 | #include "gdbcore.h" /* for get_exec_file */ | |
46 | #include <ctype.h> /* for isdigit */ | |
53ce3c39 | 47 | #include <sys/stat.h> /* for struct stat */ |
dba24537 | 48 | #include <fcntl.h> /* for O_RDONLY */ |
b84876c2 PA |
49 | #include "inf-loop.h" |
50 | #include "event-loop.h" | |
51 | #include "event-top.h" | |
07e059b5 VP |
52 | #include <pwd.h> |
53 | #include <sys/types.h> | |
2978b111 | 54 | #include <dirent.h> |
07e059b5 | 55 | #include "xml-support.h" |
efcbbd14 | 56 | #include <sys/vfs.h> |
6c95b8df | 57 | #include "solib.h" |
125f8a3d | 58 | #include "nat/linux-osdata.h" |
6432734d | 59 | #include "linux-tdep.h" |
7dcd53a0 | 60 | #include "symfile.h" |
5808517f YQ |
61 | #include "agent.h" |
62 | #include "tracepoint.h" | |
87b0bb13 | 63 | #include "buffer.h" |
6ecd4729 | 64 | #include "target-descriptions.h" |
614c279d | 65 | #include "filestuff.h" |
77e371c0 | 66 | #include "objfiles.h" |
7a6a1731 GB |
67 | #include "nat/linux-namespaces.h" |
68 | #include "fileio.h" | |
efcbbd14 UW |
69 | |
70 | #ifndef SPUFS_MAGIC | |
71 | #define SPUFS_MAGIC 0x23c9b64e | |
72 | #endif | |
dba24537 | 73 | |
1777feb0 | 74 | /* This comment documents high-level logic of this file. |
8a77dff3 VP |
75 | |
76 | Waiting for events in sync mode | |
77 | =============================== | |
78 | ||
4a6ed09b PA |
79 | When waiting for an event in a specific thread, we just use waitpid, |
80 | passing the specific pid, and not passing WNOHANG. | |
81 | ||
82 | When waiting for an event in all threads, waitpid is not quite good: | |
83 | ||
84 | - If the thread group leader exits while other threads in the thread | |
85 | group still exist, waitpid(TGID, ...) hangs. That waitpid won't | |
86 | return an exit status until the other threads in the group are | |
87 | reaped. | |
88 | ||
89 | - When a non-leader thread execs, that thread just vanishes without | |
90 | reporting an exit (so we'd hang if we waited for it explicitly in | |
91 | that case). The exec event is instead reported to the TGID pid. | |
92 | ||
93 | The solution is to always use -1 and WNOHANG, together with | |
94 | sigsuspend. | |
95 | ||
96 | First, we use non-blocking waitpid to check for events. If nothing is | |
97 | found, we use sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, | |
98 | it means something happened to a child process. As soon as we know | |
99 | there's an event, we get back to calling nonblocking waitpid. | |
100 | ||
101 | Note that SIGCHLD should be blocked between waitpid and sigsuspend | |
102 | calls, so that we don't miss a signal. If SIGCHLD arrives in between, | |
103 | when it's blocked, the signal becomes pending and sigsuspend | |
104 | immediately notices it and returns. | |
105 | ||
106 | Waiting for events in async mode (TARGET_WNOHANG) | |
107 | ================================================= | |
8a77dff3 | 108 | |
7feb7d06 PA |
109 | In async mode, GDB should always be ready to handle both user input |
110 | and target events, so neither blocking waitpid nor sigsuspend are | |
111 | viable options. Instead, we should asynchronously notify the GDB main | |
112 | event loop whenever there's an unprocessed event from the target. We | |
113 | detect asynchronous target events by handling SIGCHLD signals. To | |
114 | notify the event loop about target events, the self-pipe trick is used | |
115 | --- a pipe is registered as waitable event source in the event loop, | |
116 | the event loop select/poll's on the read end of this pipe (as well on | |
117 | other event sources, e.g., stdin), and the SIGCHLD handler writes a | |
118 | byte to this pipe. This is more portable than relying on | |
119 | pselect/ppoll, since on kernels that lack those syscalls, libc | |
120 | emulates them with select/poll+sigprocmask, and that is racy | |
121 | (a.k.a. plain broken). | |
122 | ||
123 | Obviously, if we fail to notify the event loop if there's a target | |
124 | event, it's bad. OTOH, if we notify the event loop when there's no | |
125 | event from the target, linux_nat_wait will detect that there's no real | |
126 | event to report, and return event of type TARGET_WAITKIND_IGNORE. | |
127 | This is mostly harmless, but it will waste time and is better avoided. | |
128 | ||
129 | The main design point is that every time GDB is outside linux-nat.c, | |
130 | we have a SIGCHLD handler installed that is called when something | |
131 | happens to the target and notifies the GDB event loop. Whenever GDB | |
132 | core decides to handle the event, and calls into linux-nat.c, we | |
133 | process things as in sync mode, except that the we never block in | |
134 | sigsuspend. | |
135 | ||
136 | While processing an event, we may end up momentarily blocked in | |
137 | waitpid calls. Those waitpid calls, while blocking, are guarantied to | |
138 | return quickly. E.g., in all-stop mode, before reporting to the core | |
139 | that an LWP hit a breakpoint, all LWPs are stopped by sending them | |
140 | SIGSTOP, and synchronously waiting for the SIGSTOP to be reported. | |
141 | Note that this is different from blocking indefinitely waiting for the | |
142 | next event --- here, we're already handling an event. | |
8a77dff3 VP |
143 | |
144 | Use of signals | |
145 | ============== | |
146 | ||
147 | We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another | |
148 | signal is not entirely significant; we just need for a signal to be delivered, | |
149 | so that we can intercept it. SIGSTOP's advantage is that it can not be | |
150 | blocked. A disadvantage is that it is not a real-time signal, so it can only | |
151 | be queued once; we do not keep track of other sources of SIGSTOP. | |
152 | ||
153 | Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't | |
154 | use them, because they have special behavior when the signal is generated - | |
155 | not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL | |
156 | kills the entire thread group. | |
157 | ||
158 | A delivered SIGSTOP would stop the entire thread group, not just the thread we | |
159 | tkill'd. But we never let the SIGSTOP be delivered; we always intercept and | |
160 | cancel it (by PTRACE_CONT without passing SIGSTOP). | |
161 | ||
162 | We could use a real-time signal instead. This would solve those problems; we | |
163 | could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB. | |
164 | But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH | |
165 | generates it, and there are races with trying to find a signal that is not | |
4a6ed09b PA |
166 | blocked. |
167 | ||
168 | Exec events | |
169 | =========== | |
170 | ||
171 | The case of a thread group (process) with 3 or more threads, and a | |
172 | thread other than the leader execs is worth detailing: | |
173 | ||
174 | On an exec, the Linux kernel destroys all threads except the execing | |
175 | one in the thread group, and resets the execing thread's tid to the | |
176 | tgid. No exit notification is sent for the execing thread -- from the | |
177 | ptracer's perspective, it appears as though the execing thread just | |
178 | vanishes. Until we reap all other threads except the leader and the | |
179 | execing thread, the leader will be zombie, and the execing thread will | |
180 | be in `D (disc sleep)' state. As soon as all other threads are | |
181 | reaped, the execing thread changes its tid to the tgid, and the | |
182 | previous (zombie) leader vanishes, giving place to the "new" | |
183 | leader. */ | |
a0ef4274 | 184 | |
dba24537 AC |
185 | #ifndef O_LARGEFILE |
186 | #define O_LARGEFILE 0 | |
187 | #endif | |
0274a8ce | 188 | |
433bbbf8 | 189 | /* Does the current host support PTRACE_GETREGSET? */ |
0bdb2f78 | 190 | enum tribool have_ptrace_getregset = TRIBOOL_UNKNOWN; |
433bbbf8 | 191 | |
10d6c8cd DJ |
192 | /* The single-threaded native GNU/Linux target_ops. We save a pointer for |
193 | the use of the multi-threaded target. */ | |
194 | static struct target_ops *linux_ops; | |
f973ed9c | 195 | static struct target_ops linux_ops_saved; |
10d6c8cd | 196 | |
9f0bdab8 | 197 | /* The method to call, if any, when a new thread is attached. */ |
7b50312a PA |
198 | static void (*linux_nat_new_thread) (struct lwp_info *); |
199 | ||
26cb8b7c PA |
200 | /* The method to call, if any, when a new fork is attached. */ |
201 | static linux_nat_new_fork_ftype *linux_nat_new_fork; | |
202 | ||
203 | /* The method to call, if any, when a process is no longer | |
204 | attached. */ | |
205 | static linux_nat_forget_process_ftype *linux_nat_forget_process_hook; | |
206 | ||
7b50312a PA |
207 | /* Hook to call prior to resuming a thread. */ |
208 | static void (*linux_nat_prepare_to_resume) (struct lwp_info *); | |
9f0bdab8 | 209 | |
5b009018 PA |
210 | /* The method to call, if any, when the siginfo object needs to be |
211 | converted between the layout returned by ptrace, and the layout in | |
212 | the architecture of the inferior. */ | |
a5362b9a | 213 | static int (*linux_nat_siginfo_fixup) (siginfo_t *, |
5b009018 PA |
214 | gdb_byte *, |
215 | int); | |
216 | ||
ac264b3b MS |
217 | /* The saved to_xfer_partial method, inherited from inf-ptrace.c. |
218 | Called by our to_xfer_partial. */ | |
4ac248ca | 219 | static target_xfer_partial_ftype *super_xfer_partial; |
10d6c8cd | 220 | |
6a3cb8e8 PA |
221 | /* The saved to_close method, inherited from inf-ptrace.c. |
222 | Called by our to_close. */ | |
223 | static void (*super_close) (struct target_ops *); | |
224 | ||
ccce17b0 | 225 | static unsigned int debug_linux_nat; |
920d2a44 AC |
226 | static void |
227 | show_debug_linux_nat (struct ui_file *file, int from_tty, | |
228 | struct cmd_list_element *c, const char *value) | |
229 | { | |
230 | fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"), | |
231 | value); | |
232 | } | |
d6b0e80f | 233 | |
ae087d01 DJ |
234 | struct simple_pid_list |
235 | { | |
236 | int pid; | |
3d799a95 | 237 | int status; |
ae087d01 DJ |
238 | struct simple_pid_list *next; |
239 | }; | |
240 | struct simple_pid_list *stopped_pids; | |
241 | ||
aa01bd36 PA |
242 | /* Whether target_thread_events is in effect. */ |
243 | static int report_thread_events; | |
244 | ||
3dd5b83d PA |
245 | /* Async mode support. */ |
246 | ||
b84876c2 PA |
247 | /* The read/write ends of the pipe registered as waitable file in the |
248 | event loop. */ | |
249 | static int linux_nat_event_pipe[2] = { -1, -1 }; | |
250 | ||
198297aa PA |
251 | /* True if we're currently in async mode. */ |
252 | #define linux_is_async_p() (linux_nat_event_pipe[0] != -1) | |
253 | ||
7feb7d06 | 254 | /* Flush the event pipe. */ |
b84876c2 | 255 | |
7feb7d06 PA |
256 | static void |
257 | async_file_flush (void) | |
b84876c2 | 258 | { |
7feb7d06 PA |
259 | int ret; |
260 | char buf; | |
b84876c2 | 261 | |
7feb7d06 | 262 | do |
b84876c2 | 263 | { |
7feb7d06 | 264 | ret = read (linux_nat_event_pipe[0], &buf, 1); |
b84876c2 | 265 | } |
7feb7d06 | 266 | while (ret >= 0 || (ret == -1 && errno == EINTR)); |
b84876c2 PA |
267 | } |
268 | ||
7feb7d06 PA |
269 | /* Put something (anything, doesn't matter what, or how much) in event |
270 | pipe, so that the select/poll in the event-loop realizes we have | |
271 | something to process. */ | |
252fbfc8 | 272 | |
b84876c2 | 273 | static void |
7feb7d06 | 274 | async_file_mark (void) |
b84876c2 | 275 | { |
7feb7d06 | 276 | int ret; |
b84876c2 | 277 | |
7feb7d06 PA |
278 | /* It doesn't really matter what the pipe contains, as long we end |
279 | up with something in it. Might as well flush the previous | |
280 | left-overs. */ | |
281 | async_file_flush (); | |
b84876c2 | 282 | |
7feb7d06 | 283 | do |
b84876c2 | 284 | { |
7feb7d06 | 285 | ret = write (linux_nat_event_pipe[1], "+", 1); |
b84876c2 | 286 | } |
7feb7d06 | 287 | while (ret == -1 && errno == EINTR); |
b84876c2 | 288 | |
7feb7d06 PA |
289 | /* Ignore EAGAIN. If the pipe is full, the event loop will already |
290 | be awakened anyway. */ | |
b84876c2 PA |
291 | } |
292 | ||
7feb7d06 PA |
293 | static int kill_lwp (int lwpid, int signo); |
294 | ||
295 | static int stop_callback (struct lwp_info *lp, void *data); | |
2db9a427 | 296 | static int resume_stopped_resumed_lwps (struct lwp_info *lp, void *data); |
7feb7d06 PA |
297 | |
298 | static void block_child_signals (sigset_t *prev_mask); | |
299 | static void restore_child_signals_mask (sigset_t *prev_mask); | |
2277426b PA |
300 | |
301 | struct lwp_info; | |
302 | static struct lwp_info *add_lwp (ptid_t ptid); | |
303 | static void purge_lwp_list (int pid); | |
4403d8e9 | 304 | static void delete_lwp (ptid_t ptid); |
2277426b PA |
305 | static struct lwp_info *find_lwp_pid (ptid_t ptid); |
306 | ||
8a99810d PA |
307 | static int lwp_status_pending_p (struct lwp_info *lp); |
308 | ||
9c02b525 PA |
309 | static int sigtrap_is_event (int status); |
310 | static int (*linux_nat_status_is_event) (int status) = sigtrap_is_event; | |
311 | ||
e7ad2f14 PA |
312 | static void save_stop_reason (struct lwp_info *lp); |
313 | ||
cff068da GB |
314 | \f |
315 | /* LWP accessors. */ | |
316 | ||
317 | /* See nat/linux-nat.h. */ | |
318 | ||
319 | ptid_t | |
320 | ptid_of_lwp (struct lwp_info *lwp) | |
321 | { | |
322 | return lwp->ptid; | |
323 | } | |
324 | ||
325 | /* See nat/linux-nat.h. */ | |
326 | ||
4b134ca1 GB |
327 | void |
328 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
329 | struct arch_lwp_info *info) | |
330 | { | |
331 | lwp->arch_private = info; | |
332 | } | |
333 | ||
334 | /* See nat/linux-nat.h. */ | |
335 | ||
336 | struct arch_lwp_info * | |
337 | lwp_arch_private_info (struct lwp_info *lwp) | |
338 | { | |
339 | return lwp->arch_private; | |
340 | } | |
341 | ||
342 | /* See nat/linux-nat.h. */ | |
343 | ||
cff068da GB |
344 | int |
345 | lwp_is_stopped (struct lwp_info *lwp) | |
346 | { | |
347 | return lwp->stopped; | |
348 | } | |
349 | ||
350 | /* See nat/linux-nat.h. */ | |
351 | ||
352 | enum target_stop_reason | |
353 | lwp_stop_reason (struct lwp_info *lwp) | |
354 | { | |
355 | return lwp->stop_reason; | |
356 | } | |
357 | ||
ae087d01 DJ |
358 | \f |
359 | /* Trivial list manipulation functions to keep track of a list of | |
360 | new stopped processes. */ | |
361 | static void | |
3d799a95 | 362 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) |
ae087d01 | 363 | { |
8d749320 | 364 | struct simple_pid_list *new_pid = XNEW (struct simple_pid_list); |
e0881a8e | 365 | |
ae087d01 | 366 | new_pid->pid = pid; |
3d799a95 | 367 | new_pid->status = status; |
ae087d01 DJ |
368 | new_pid->next = *listp; |
369 | *listp = new_pid; | |
370 | } | |
371 | ||
372 | static int | |
46a96992 | 373 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) |
ae087d01 DJ |
374 | { |
375 | struct simple_pid_list **p; | |
376 | ||
377 | for (p = listp; *p != NULL; p = &(*p)->next) | |
378 | if ((*p)->pid == pid) | |
379 | { | |
380 | struct simple_pid_list *next = (*p)->next; | |
e0881a8e | 381 | |
46a96992 | 382 | *statusp = (*p)->status; |
ae087d01 DJ |
383 | xfree (*p); |
384 | *p = next; | |
385 | return 1; | |
386 | } | |
387 | return 0; | |
388 | } | |
389 | ||
de0d863e DB |
390 | /* Return the ptrace options that we want to try to enable. */ |
391 | ||
392 | static int | |
393 | linux_nat_ptrace_options (int attached) | |
394 | { | |
395 | int options = 0; | |
396 | ||
397 | if (!attached) | |
398 | options |= PTRACE_O_EXITKILL; | |
399 | ||
400 | options |= (PTRACE_O_TRACESYSGOOD | |
401 | | PTRACE_O_TRACEVFORKDONE | |
402 | | PTRACE_O_TRACEVFORK | |
403 | | PTRACE_O_TRACEFORK | |
404 | | PTRACE_O_TRACEEXEC); | |
405 | ||
406 | return options; | |
407 | } | |
408 | ||
96d7229d | 409 | /* Initialize ptrace warnings and check for supported ptrace |
beed38b8 JB |
410 | features given PID. |
411 | ||
412 | ATTACHED should be nonzero iff we attached to the inferior. */ | |
3993f6b1 DJ |
413 | |
414 | static void | |
beed38b8 | 415 | linux_init_ptrace (pid_t pid, int attached) |
3993f6b1 | 416 | { |
de0d863e DB |
417 | int options = linux_nat_ptrace_options (attached); |
418 | ||
419 | linux_enable_event_reporting (pid, options); | |
96d7229d | 420 | linux_ptrace_init_warnings (); |
4de4c07c DJ |
421 | } |
422 | ||
6d8fd2b7 | 423 | static void |
f045800c | 424 | linux_child_post_attach (struct target_ops *self, int pid) |
4de4c07c | 425 | { |
beed38b8 | 426 | linux_init_ptrace (pid, 1); |
4de4c07c DJ |
427 | } |
428 | ||
10d6c8cd | 429 | static void |
2e97a79e | 430 | linux_child_post_startup_inferior (struct target_ops *self, ptid_t ptid) |
4de4c07c | 431 | { |
beed38b8 | 432 | linux_init_ptrace (ptid_get_pid (ptid), 0); |
4de4c07c DJ |
433 | } |
434 | ||
4403d8e9 JK |
435 | /* Return the number of known LWPs in the tgid given by PID. */ |
436 | ||
437 | static int | |
438 | num_lwps (int pid) | |
439 | { | |
440 | int count = 0; | |
441 | struct lwp_info *lp; | |
442 | ||
443 | for (lp = lwp_list; lp; lp = lp->next) | |
444 | if (ptid_get_pid (lp->ptid) == pid) | |
445 | count++; | |
446 | ||
447 | return count; | |
448 | } | |
449 | ||
450 | /* Call delete_lwp with prototype compatible for make_cleanup. */ | |
451 | ||
452 | static void | |
453 | delete_lwp_cleanup (void *lp_voidp) | |
454 | { | |
9a3c8263 | 455 | struct lwp_info *lp = (struct lwp_info *) lp_voidp; |
4403d8e9 JK |
456 | |
457 | delete_lwp (lp->ptid); | |
458 | } | |
459 | ||
d83ad864 DB |
460 | /* Target hook for follow_fork. On entry inferior_ptid must be the |
461 | ptid of the followed inferior. At return, inferior_ptid will be | |
462 | unchanged. */ | |
463 | ||
6d8fd2b7 | 464 | static int |
07107ca6 LM |
465 | linux_child_follow_fork (struct target_ops *ops, int follow_child, |
466 | int detach_fork) | |
3993f6b1 | 467 | { |
d83ad864 | 468 | if (!follow_child) |
4de4c07c | 469 | { |
6c95b8df | 470 | struct lwp_info *child_lp = NULL; |
d83ad864 DB |
471 | int status = W_STOPCODE (0); |
472 | struct cleanup *old_chain; | |
473 | int has_vforked; | |
79639e11 | 474 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
475 | int parent_pid, child_pid; |
476 | ||
477 | has_vforked = (inferior_thread ()->pending_follow.kind | |
478 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
479 | parent_ptid = inferior_ptid; |
480 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
481 | parent_pid = ptid_get_lwp (parent_ptid); | |
482 | child_pid = ptid_get_lwp (child_ptid); | |
4de4c07c | 483 | |
1777feb0 | 484 | /* We're already attached to the parent, by default. */ |
d83ad864 | 485 | old_chain = save_inferior_ptid (); |
79639e11 | 486 | inferior_ptid = child_ptid; |
d83ad864 DB |
487 | child_lp = add_lwp (inferior_ptid); |
488 | child_lp->stopped = 1; | |
489 | child_lp->last_resume_kind = resume_stop; | |
4de4c07c | 490 | |
ac264b3b MS |
491 | /* Detach new forked process? */ |
492 | if (detach_fork) | |
f75c00e4 | 493 | { |
4403d8e9 JK |
494 | make_cleanup (delete_lwp_cleanup, child_lp); |
495 | ||
4403d8e9 JK |
496 | if (linux_nat_prepare_to_resume != NULL) |
497 | linux_nat_prepare_to_resume (child_lp); | |
c077881a HZ |
498 | |
499 | /* When debugging an inferior in an architecture that supports | |
500 | hardware single stepping on a kernel without commit | |
501 | 6580807da14c423f0d0a708108e6df6ebc8bc83d, the vfork child | |
502 | process starts with the TIF_SINGLESTEP/X86_EFLAGS_TF bits | |
503 | set if the parent process had them set. | |
504 | To work around this, single step the child process | |
505 | once before detaching to clear the flags. */ | |
506 | ||
507 | if (!gdbarch_software_single_step_p (target_thread_architecture | |
508 | (child_lp->ptid))) | |
509 | { | |
c077881a HZ |
510 | linux_disable_event_reporting (child_pid); |
511 | if (ptrace (PTRACE_SINGLESTEP, child_pid, 0, 0) < 0) | |
512 | perror_with_name (_("Couldn't do single step")); | |
513 | if (my_waitpid (child_pid, &status, 0) < 0) | |
514 | perror_with_name (_("Couldn't wait vfork process")); | |
515 | } | |
516 | ||
517 | if (WIFSTOPPED (status)) | |
9caaaa83 PA |
518 | { |
519 | int signo; | |
520 | ||
521 | signo = WSTOPSIG (status); | |
522 | if (signo != 0 | |
523 | && !signal_pass_state (gdb_signal_from_host (signo))) | |
524 | signo = 0; | |
525 | ptrace (PTRACE_DETACH, child_pid, 0, signo); | |
526 | } | |
4403d8e9 | 527 | |
d83ad864 | 528 | /* Resets value of inferior_ptid to parent ptid. */ |
4403d8e9 | 529 | do_cleanups (old_chain); |
ac264b3b MS |
530 | } |
531 | else | |
532 | { | |
6c95b8df | 533 | /* Let the thread_db layer learn about this new process. */ |
2277426b | 534 | check_for_thread_db (); |
ac264b3b | 535 | } |
9016a515 | 536 | |
d83ad864 DB |
537 | do_cleanups (old_chain); |
538 | ||
9016a515 DJ |
539 | if (has_vforked) |
540 | { | |
3ced3da4 | 541 | struct lwp_info *parent_lp; |
6c95b8df | 542 | |
79639e11 | 543 | parent_lp = find_lwp_pid (parent_ptid); |
96d7229d | 544 | gdb_assert (linux_supports_tracefork () >= 0); |
3ced3da4 | 545 | |
96d7229d | 546 | if (linux_supports_tracevforkdone ()) |
9016a515 | 547 | { |
6c95b8df PA |
548 | if (debug_linux_nat) |
549 | fprintf_unfiltered (gdb_stdlog, | |
550 | "LCFF: waiting for VFORK_DONE on %d\n", | |
551 | parent_pid); | |
3ced3da4 | 552 | parent_lp->stopped = 1; |
9016a515 | 553 | |
6c95b8df PA |
554 | /* We'll handle the VFORK_DONE event like any other |
555 | event, in target_wait. */ | |
9016a515 DJ |
556 | } |
557 | else | |
558 | { | |
559 | /* We can't insert breakpoints until the child has | |
560 | finished with the shared memory region. We need to | |
561 | wait until that happens. Ideal would be to just | |
562 | call: | |
563 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
564 | - waitpid (parent_pid, &status, __WALL); | |
565 | However, most architectures can't handle a syscall | |
566 | being traced on the way out if it wasn't traced on | |
567 | the way in. | |
568 | ||
569 | We might also think to loop, continuing the child | |
570 | until it exits or gets a SIGTRAP. One problem is | |
571 | that the child might call ptrace with PTRACE_TRACEME. | |
572 | ||
573 | There's no simple and reliable way to figure out when | |
574 | the vforked child will be done with its copy of the | |
575 | shared memory. We could step it out of the syscall, | |
576 | two instructions, let it go, and then single-step the | |
577 | parent once. When we have hardware single-step, this | |
578 | would work; with software single-step it could still | |
579 | be made to work but we'd have to be able to insert | |
580 | single-step breakpoints in the child, and we'd have | |
581 | to insert -just- the single-step breakpoint in the | |
582 | parent. Very awkward. | |
583 | ||
584 | In the end, the best we can do is to make sure it | |
585 | runs for a little while. Hopefully it will be out of | |
586 | range of any breakpoints we reinsert. Usually this | |
587 | is only the single-step breakpoint at vfork's return | |
588 | point. */ | |
589 | ||
6c95b8df PA |
590 | if (debug_linux_nat) |
591 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
592 | "LCFF: no VFORK_DONE " |
593 | "support, sleeping a bit\n"); | |
6c95b8df | 594 | |
9016a515 | 595 | usleep (10000); |
9016a515 | 596 | |
6c95b8df PA |
597 | /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event, |
598 | and leave it pending. The next linux_nat_resume call | |
599 | will notice a pending event, and bypasses actually | |
600 | resuming the inferior. */ | |
3ced3da4 PA |
601 | parent_lp->status = 0; |
602 | parent_lp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
603 | parent_lp->stopped = 1; | |
6c95b8df PA |
604 | |
605 | /* If we're in async mode, need to tell the event loop | |
606 | there's something here to process. */ | |
d9d41e78 | 607 | if (target_is_async_p ()) |
6c95b8df PA |
608 | async_file_mark (); |
609 | } | |
9016a515 | 610 | } |
4de4c07c | 611 | } |
3993f6b1 | 612 | else |
4de4c07c | 613 | { |
3ced3da4 | 614 | struct lwp_info *child_lp; |
4de4c07c | 615 | |
3ced3da4 PA |
616 | child_lp = add_lwp (inferior_ptid); |
617 | child_lp->stopped = 1; | |
25289eb2 | 618 | child_lp->last_resume_kind = resume_stop; |
6c95b8df | 619 | |
6c95b8df | 620 | /* Let the thread_db layer learn about this new process. */ |
ef29ce1a | 621 | check_for_thread_db (); |
4de4c07c DJ |
622 | } |
623 | ||
624 | return 0; | |
625 | } | |
626 | ||
4de4c07c | 627 | \f |
77b06cd7 | 628 | static int |
a863b201 | 629 | linux_child_insert_fork_catchpoint (struct target_ops *self, int pid) |
4de4c07c | 630 | { |
96d7229d | 631 | return !linux_supports_tracefork (); |
3993f6b1 DJ |
632 | } |
633 | ||
eb73ad13 | 634 | static int |
973fc227 | 635 | linux_child_remove_fork_catchpoint (struct target_ops *self, int pid) |
eb73ad13 PA |
636 | { |
637 | return 0; | |
638 | } | |
639 | ||
77b06cd7 | 640 | static int |
3ecc7da0 | 641 | linux_child_insert_vfork_catchpoint (struct target_ops *self, int pid) |
3993f6b1 | 642 | { |
96d7229d | 643 | return !linux_supports_tracefork (); |
3993f6b1 DJ |
644 | } |
645 | ||
eb73ad13 | 646 | static int |
e98cf0cd | 647 | linux_child_remove_vfork_catchpoint (struct target_ops *self, int pid) |
eb73ad13 PA |
648 | { |
649 | return 0; | |
650 | } | |
651 | ||
77b06cd7 | 652 | static int |
ba025e51 | 653 | linux_child_insert_exec_catchpoint (struct target_ops *self, int pid) |
3993f6b1 | 654 | { |
96d7229d | 655 | return !linux_supports_tracefork (); |
3993f6b1 DJ |
656 | } |
657 | ||
eb73ad13 | 658 | static int |
758e29d2 | 659 | linux_child_remove_exec_catchpoint (struct target_ops *self, int pid) |
eb73ad13 PA |
660 | { |
661 | return 0; | |
662 | } | |
663 | ||
a96d9b2e | 664 | static int |
ff214e67 TT |
665 | linux_child_set_syscall_catchpoint (struct target_ops *self, |
666 | int pid, int needed, int any_count, | |
a96d9b2e SDJ |
667 | int table_size, int *table) |
668 | { | |
96d7229d | 669 | if (!linux_supports_tracesysgood ()) |
77b06cd7 TJB |
670 | return 1; |
671 | ||
a96d9b2e SDJ |
672 | /* On GNU/Linux, we ignore the arguments. It means that we only |
673 | enable the syscall catchpoints, but do not disable them. | |
77b06cd7 | 674 | |
a96d9b2e SDJ |
675 | Also, we do not use the `table' information because we do not |
676 | filter system calls here. We let GDB do the logic for us. */ | |
677 | return 0; | |
678 | } | |
679 | ||
774113b0 PA |
680 | /* List of known LWPs, keyed by LWP PID. This speeds up the common |
681 | case of mapping a PID returned from the kernel to our corresponding | |
682 | lwp_info data structure. */ | |
683 | static htab_t lwp_lwpid_htab; | |
684 | ||
685 | /* Calculate a hash from a lwp_info's LWP PID. */ | |
686 | ||
687 | static hashval_t | |
688 | lwp_info_hash (const void *ap) | |
689 | { | |
690 | const struct lwp_info *lp = (struct lwp_info *) ap; | |
691 | pid_t pid = ptid_get_lwp (lp->ptid); | |
692 | ||
693 | return iterative_hash_object (pid, 0); | |
694 | } | |
695 | ||
696 | /* Equality function for the lwp_info hash table. Compares the LWP's | |
697 | PID. */ | |
698 | ||
699 | static int | |
700 | lwp_lwpid_htab_eq (const void *a, const void *b) | |
701 | { | |
702 | const struct lwp_info *entry = (const struct lwp_info *) a; | |
703 | const struct lwp_info *element = (const struct lwp_info *) b; | |
704 | ||
705 | return ptid_get_lwp (entry->ptid) == ptid_get_lwp (element->ptid); | |
706 | } | |
707 | ||
708 | /* Create the lwp_lwpid_htab hash table. */ | |
709 | ||
710 | static void | |
711 | lwp_lwpid_htab_create (void) | |
712 | { | |
713 | lwp_lwpid_htab = htab_create (100, lwp_info_hash, lwp_lwpid_htab_eq, NULL); | |
714 | } | |
715 | ||
716 | /* Add LP to the hash table. */ | |
717 | ||
718 | static void | |
719 | lwp_lwpid_htab_add_lwp (struct lwp_info *lp) | |
720 | { | |
721 | void **slot; | |
722 | ||
723 | slot = htab_find_slot (lwp_lwpid_htab, lp, INSERT); | |
724 | gdb_assert (slot != NULL && *slot == NULL); | |
725 | *slot = lp; | |
726 | } | |
727 | ||
728 | /* Head of doubly-linked list of known LWPs. Sorted by reverse | |
729 | creation order. This order is assumed in some cases. E.g., | |
730 | reaping status after killing alls lwps of a process: the leader LWP | |
731 | must be reaped last. */ | |
9f0bdab8 | 732 | struct lwp_info *lwp_list; |
774113b0 PA |
733 | |
734 | /* Add LP to sorted-by-reverse-creation-order doubly-linked list. */ | |
735 | ||
736 | static void | |
737 | lwp_list_add (struct lwp_info *lp) | |
738 | { | |
739 | lp->next = lwp_list; | |
740 | if (lwp_list != NULL) | |
741 | lwp_list->prev = lp; | |
742 | lwp_list = lp; | |
743 | } | |
744 | ||
745 | /* Remove LP from sorted-by-reverse-creation-order doubly-linked | |
746 | list. */ | |
747 | ||
748 | static void | |
749 | lwp_list_remove (struct lwp_info *lp) | |
750 | { | |
751 | /* Remove from sorted-by-creation-order list. */ | |
752 | if (lp->next != NULL) | |
753 | lp->next->prev = lp->prev; | |
754 | if (lp->prev != NULL) | |
755 | lp->prev->next = lp->next; | |
756 | if (lp == lwp_list) | |
757 | lwp_list = lp->next; | |
758 | } | |
759 | ||
d6b0e80f AC |
760 | \f |
761 | ||
d6b0e80f AC |
762 | /* Original signal mask. */ |
763 | static sigset_t normal_mask; | |
764 | ||
765 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
766 | _initialize_linux_nat. */ | |
767 | static sigset_t suspend_mask; | |
768 | ||
7feb7d06 PA |
769 | /* Signals to block to make that sigsuspend work. */ |
770 | static sigset_t blocked_mask; | |
771 | ||
772 | /* SIGCHLD action. */ | |
773 | struct sigaction sigchld_action; | |
b84876c2 | 774 | |
7feb7d06 PA |
775 | /* Block child signals (SIGCHLD and linux threads signals), and store |
776 | the previous mask in PREV_MASK. */ | |
84e46146 | 777 | |
7feb7d06 PA |
778 | static void |
779 | block_child_signals (sigset_t *prev_mask) | |
780 | { | |
781 | /* Make sure SIGCHLD is blocked. */ | |
782 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
783 | sigaddset (&blocked_mask, SIGCHLD); | |
784 | ||
785 | sigprocmask (SIG_BLOCK, &blocked_mask, prev_mask); | |
786 | } | |
787 | ||
788 | /* Restore child signals mask, previously returned by | |
789 | block_child_signals. */ | |
790 | ||
791 | static void | |
792 | restore_child_signals_mask (sigset_t *prev_mask) | |
793 | { | |
794 | sigprocmask (SIG_SETMASK, prev_mask, NULL); | |
795 | } | |
2455069d UW |
796 | |
797 | /* Mask of signals to pass directly to the inferior. */ | |
798 | static sigset_t pass_mask; | |
799 | ||
800 | /* Update signals to pass to the inferior. */ | |
801 | static void | |
94bedb42 TT |
802 | linux_nat_pass_signals (struct target_ops *self, |
803 | int numsigs, unsigned char *pass_signals) | |
2455069d UW |
804 | { |
805 | int signo; | |
806 | ||
807 | sigemptyset (&pass_mask); | |
808 | ||
809 | for (signo = 1; signo < NSIG; signo++) | |
810 | { | |
2ea28649 | 811 | int target_signo = gdb_signal_from_host (signo); |
2455069d UW |
812 | if (target_signo < numsigs && pass_signals[target_signo]) |
813 | sigaddset (&pass_mask, signo); | |
814 | } | |
815 | } | |
816 | ||
d6b0e80f AC |
817 | \f |
818 | ||
819 | /* Prototypes for local functions. */ | |
820 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
8dd27370 | 821 | static char *linux_child_pid_to_exec_file (struct target_ops *self, int pid); |
20ba1ce6 | 822 | static int resume_stopped_resumed_lwps (struct lwp_info *lp, void *data); |
ced2dffb | 823 | static int check_ptrace_stopped_lwp_gone (struct lwp_info *lp); |
710151dd | 824 | |
d6b0e80f | 825 | \f |
d6b0e80f | 826 | |
7b50312a PA |
827 | /* Destroy and free LP. */ |
828 | ||
829 | static void | |
830 | lwp_free (struct lwp_info *lp) | |
831 | { | |
832 | xfree (lp->arch_private); | |
833 | xfree (lp); | |
834 | } | |
835 | ||
774113b0 | 836 | /* Traversal function for purge_lwp_list. */ |
d90e17a7 | 837 | |
774113b0 PA |
838 | static int |
839 | lwp_lwpid_htab_remove_pid (void **slot, void *info) | |
d90e17a7 | 840 | { |
774113b0 PA |
841 | struct lwp_info *lp = (struct lwp_info *) *slot; |
842 | int pid = *(int *) info; | |
d90e17a7 | 843 | |
774113b0 | 844 | if (ptid_get_pid (lp->ptid) == pid) |
d90e17a7 | 845 | { |
774113b0 PA |
846 | htab_clear_slot (lwp_lwpid_htab, slot); |
847 | lwp_list_remove (lp); | |
848 | lwp_free (lp); | |
849 | } | |
d90e17a7 | 850 | |
774113b0 PA |
851 | return 1; |
852 | } | |
d90e17a7 | 853 | |
774113b0 PA |
854 | /* Remove all LWPs belong to PID from the lwp list. */ |
855 | ||
856 | static void | |
857 | purge_lwp_list (int pid) | |
858 | { | |
859 | htab_traverse_noresize (lwp_lwpid_htab, lwp_lwpid_htab_remove_pid, &pid); | |
d90e17a7 PA |
860 | } |
861 | ||
26cb8b7c PA |
862 | /* Add the LWP specified by PTID to the list. PTID is the first LWP |
863 | in the process. Return a pointer to the structure describing the | |
864 | new LWP. | |
865 | ||
866 | This differs from add_lwp in that we don't let the arch specific | |
867 | bits know about this new thread. Current clients of this callback | |
868 | take the opportunity to install watchpoints in the new thread, and | |
869 | we shouldn't do that for the first thread. If we're spawning a | |
870 | child ("run"), the thread executes the shell wrapper first, and we | |
871 | shouldn't touch it until it execs the program we want to debug. | |
872 | For "attach", it'd be okay to call the callback, but it's not | |
873 | necessary, because watchpoints can't yet have been inserted into | |
874 | the inferior. */ | |
d6b0e80f AC |
875 | |
876 | static struct lwp_info * | |
26cb8b7c | 877 | add_initial_lwp (ptid_t ptid) |
d6b0e80f AC |
878 | { |
879 | struct lwp_info *lp; | |
880 | ||
dfd4cc63 | 881 | gdb_assert (ptid_lwp_p (ptid)); |
d6b0e80f | 882 | |
8d749320 | 883 | lp = XNEW (struct lwp_info); |
d6b0e80f AC |
884 | |
885 | memset (lp, 0, sizeof (struct lwp_info)); | |
886 | ||
25289eb2 | 887 | lp->last_resume_kind = resume_continue; |
d6b0e80f AC |
888 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; |
889 | ||
890 | lp->ptid = ptid; | |
dc146f7c | 891 | lp->core = -1; |
d6b0e80f | 892 | |
774113b0 PA |
893 | /* Add to sorted-by-reverse-creation-order list. */ |
894 | lwp_list_add (lp); | |
895 | ||
896 | /* Add to keyed-by-pid htab. */ | |
897 | lwp_lwpid_htab_add_lwp (lp); | |
d6b0e80f | 898 | |
26cb8b7c PA |
899 | return lp; |
900 | } | |
901 | ||
902 | /* Add the LWP specified by PID to the list. Return a pointer to the | |
903 | structure describing the new LWP. The LWP should already be | |
904 | stopped. */ | |
905 | ||
906 | static struct lwp_info * | |
907 | add_lwp (ptid_t ptid) | |
908 | { | |
909 | struct lwp_info *lp; | |
910 | ||
911 | lp = add_initial_lwp (ptid); | |
912 | ||
6e012a6c PA |
913 | /* Let the arch specific bits know about this new thread. Current |
914 | clients of this callback take the opportunity to install | |
26cb8b7c PA |
915 | watchpoints in the new thread. We don't do this for the first |
916 | thread though. See add_initial_lwp. */ | |
917 | if (linux_nat_new_thread != NULL) | |
7b50312a | 918 | linux_nat_new_thread (lp); |
9f0bdab8 | 919 | |
d6b0e80f AC |
920 | return lp; |
921 | } | |
922 | ||
923 | /* Remove the LWP specified by PID from the list. */ | |
924 | ||
925 | static void | |
926 | delete_lwp (ptid_t ptid) | |
927 | { | |
774113b0 PA |
928 | struct lwp_info *lp; |
929 | void **slot; | |
930 | struct lwp_info dummy; | |
d6b0e80f | 931 | |
774113b0 PA |
932 | dummy.ptid = ptid; |
933 | slot = htab_find_slot (lwp_lwpid_htab, &dummy, NO_INSERT); | |
934 | if (slot == NULL) | |
935 | return; | |
d6b0e80f | 936 | |
774113b0 PA |
937 | lp = *(struct lwp_info **) slot; |
938 | gdb_assert (lp != NULL); | |
d6b0e80f | 939 | |
774113b0 | 940 | htab_clear_slot (lwp_lwpid_htab, slot); |
d6b0e80f | 941 | |
774113b0 PA |
942 | /* Remove from sorted-by-creation-order list. */ |
943 | lwp_list_remove (lp); | |
d6b0e80f | 944 | |
774113b0 | 945 | /* Release. */ |
7b50312a | 946 | lwp_free (lp); |
d6b0e80f AC |
947 | } |
948 | ||
949 | /* Return a pointer to the structure describing the LWP corresponding | |
950 | to PID. If no corresponding LWP could be found, return NULL. */ | |
951 | ||
952 | static struct lwp_info * | |
953 | find_lwp_pid (ptid_t ptid) | |
954 | { | |
955 | struct lwp_info *lp; | |
956 | int lwp; | |
774113b0 | 957 | struct lwp_info dummy; |
d6b0e80f | 958 | |
dfd4cc63 LM |
959 | if (ptid_lwp_p (ptid)) |
960 | lwp = ptid_get_lwp (ptid); | |
d6b0e80f | 961 | else |
dfd4cc63 | 962 | lwp = ptid_get_pid (ptid); |
d6b0e80f | 963 | |
774113b0 PA |
964 | dummy.ptid = ptid_build (0, lwp, 0); |
965 | lp = (struct lwp_info *) htab_find (lwp_lwpid_htab, &dummy); | |
966 | return lp; | |
d6b0e80f AC |
967 | } |
968 | ||
6d4ee8c6 | 969 | /* See nat/linux-nat.h. */ |
d6b0e80f AC |
970 | |
971 | struct lwp_info * | |
d90e17a7 | 972 | iterate_over_lwps (ptid_t filter, |
6d4ee8c6 | 973 | iterate_over_lwps_ftype callback, |
d90e17a7 | 974 | void *data) |
d6b0e80f AC |
975 | { |
976 | struct lwp_info *lp, *lpnext; | |
977 | ||
978 | for (lp = lwp_list; lp; lp = lpnext) | |
979 | { | |
980 | lpnext = lp->next; | |
d90e17a7 PA |
981 | |
982 | if (ptid_match (lp->ptid, filter)) | |
983 | { | |
6d4ee8c6 | 984 | if ((*callback) (lp, data) != 0) |
d90e17a7 PA |
985 | return lp; |
986 | } | |
d6b0e80f AC |
987 | } |
988 | ||
989 | return NULL; | |
990 | } | |
991 | ||
2277426b PA |
992 | /* Update our internal state when changing from one checkpoint to |
993 | another indicated by NEW_PTID. We can only switch single-threaded | |
994 | applications, so we only create one new LWP, and the previous list | |
995 | is discarded. */ | |
f973ed9c DJ |
996 | |
997 | void | |
998 | linux_nat_switch_fork (ptid_t new_ptid) | |
999 | { | |
1000 | struct lwp_info *lp; | |
1001 | ||
dfd4cc63 | 1002 | purge_lwp_list (ptid_get_pid (inferior_ptid)); |
2277426b | 1003 | |
f973ed9c DJ |
1004 | lp = add_lwp (new_ptid); |
1005 | lp->stopped = 1; | |
e26af52f | 1006 | |
2277426b PA |
1007 | /* This changes the thread's ptid while preserving the gdb thread |
1008 | num. Also changes the inferior pid, while preserving the | |
1009 | inferior num. */ | |
1010 | thread_change_ptid (inferior_ptid, new_ptid); | |
1011 | ||
1012 | /* We've just told GDB core that the thread changed target id, but, | |
1013 | in fact, it really is a different thread, with different register | |
1014 | contents. */ | |
1015 | registers_changed (); | |
e26af52f DJ |
1016 | } |
1017 | ||
e26af52f DJ |
1018 | /* Handle the exit of a single thread LP. */ |
1019 | ||
1020 | static void | |
1021 | exit_lwp (struct lwp_info *lp) | |
1022 | { | |
e09875d4 | 1023 | struct thread_info *th = find_thread_ptid (lp->ptid); |
063bfe2e VP |
1024 | |
1025 | if (th) | |
e26af52f | 1026 | { |
17faa917 DJ |
1027 | if (print_thread_events) |
1028 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1029 | ||
4f8d22e3 | 1030 | delete_thread (lp->ptid); |
e26af52f DJ |
1031 | } |
1032 | ||
1033 | delete_lwp (lp->ptid); | |
1034 | } | |
1035 | ||
a0ef4274 DJ |
1036 | /* Wait for the LWP specified by LP, which we have just attached to. |
1037 | Returns a wait status for that LWP, to cache. */ | |
1038 | ||
1039 | static int | |
4a6ed09b | 1040 | linux_nat_post_attach_wait (ptid_t ptid, int first, int *signalled) |
a0ef4274 | 1041 | { |
dfd4cc63 | 1042 | pid_t new_pid, pid = ptid_get_lwp (ptid); |
a0ef4274 DJ |
1043 | int status; |
1044 | ||
644cebc9 | 1045 | if (linux_proc_pid_is_stopped (pid)) |
a0ef4274 DJ |
1046 | { |
1047 | if (debug_linux_nat) | |
1048 | fprintf_unfiltered (gdb_stdlog, | |
1049 | "LNPAW: Attaching to a stopped process\n"); | |
1050 | ||
1051 | /* The process is definitely stopped. It is in a job control | |
1052 | stop, unless the kernel predates the TASK_STOPPED / | |
1053 | TASK_TRACED distinction, in which case it might be in a | |
1054 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1055 | can kill it, signal it, et cetera. | |
1056 | ||
1057 | First make sure there is a pending SIGSTOP. Since we are | |
1058 | already attached, the process can not transition from stopped | |
1059 | to running without a PTRACE_CONT; so we know this signal will | |
1060 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1061 | probably already in the queue (unless this kernel is old | |
1062 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1063 | is not an RT signal, it can only be queued once. */ | |
1064 | kill_lwp (pid, SIGSTOP); | |
1065 | ||
1066 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1067 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1068 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1069 | } | |
1070 | ||
1071 | /* Make sure the initial process is stopped. The user-level threads | |
1072 | layer might want to poke around in the inferior, and that won't | |
1073 | work if things haven't stabilized yet. */ | |
4a6ed09b | 1074 | new_pid = my_waitpid (pid, &status, __WALL); |
dacc9cb2 PP |
1075 | gdb_assert (pid == new_pid); |
1076 | ||
1077 | if (!WIFSTOPPED (status)) | |
1078 | { | |
1079 | /* The pid we tried to attach has apparently just exited. */ | |
1080 | if (debug_linux_nat) | |
1081 | fprintf_unfiltered (gdb_stdlog, "LNPAW: Failed to stop %d: %s", | |
1082 | pid, status_to_str (status)); | |
1083 | return status; | |
1084 | } | |
a0ef4274 DJ |
1085 | |
1086 | if (WSTOPSIG (status) != SIGSTOP) | |
1087 | { | |
1088 | *signalled = 1; | |
1089 | if (debug_linux_nat) | |
1090 | fprintf_unfiltered (gdb_stdlog, | |
1091 | "LNPAW: Received %s after attaching\n", | |
1092 | status_to_str (status)); | |
1093 | } | |
1094 | ||
1095 | return status; | |
1096 | } | |
1097 | ||
b84876c2 | 1098 | static void |
136d6dae VP |
1099 | linux_nat_create_inferior (struct target_ops *ops, |
1100 | char *exec_file, char *allargs, char **env, | |
b84876c2 PA |
1101 | int from_tty) |
1102 | { | |
8cc73a39 SDJ |
1103 | struct cleanup *restore_personality |
1104 | = maybe_disable_address_space_randomization (disable_randomization); | |
b84876c2 PA |
1105 | |
1106 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1107 | we have to mask the async mode. */ | |
1108 | ||
2455069d | 1109 | /* Make sure we report all signals during startup. */ |
94bedb42 | 1110 | linux_nat_pass_signals (ops, 0, NULL); |
2455069d | 1111 | |
136d6dae | 1112 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 | 1113 | |
8cc73a39 | 1114 | do_cleanups (restore_personality); |
b84876c2 PA |
1115 | } |
1116 | ||
8784d563 PA |
1117 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
1118 | already attached. Returns true if a new LWP is found, false | |
1119 | otherwise. */ | |
1120 | ||
1121 | static int | |
1122 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1123 | { | |
1124 | struct lwp_info *lp; | |
1125 | ||
1126 | /* Ignore LWPs we're already attached to. */ | |
1127 | lp = find_lwp_pid (ptid); | |
1128 | if (lp == NULL) | |
1129 | { | |
1130 | int lwpid = ptid_get_lwp (ptid); | |
1131 | ||
1132 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) < 0) | |
1133 | { | |
1134 | int err = errno; | |
1135 | ||
1136 | /* Be quiet if we simply raced with the thread exiting. | |
1137 | EPERM is returned if the thread's task still exists, and | |
1138 | is marked as exited or zombie, as well as other | |
1139 | conditions, so in that case, confirm the status in | |
1140 | /proc/PID/status. */ | |
1141 | if (err == ESRCH | |
1142 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
1143 | { | |
1144 | if (debug_linux_nat) | |
1145 | { | |
1146 | fprintf_unfiltered (gdb_stdlog, | |
1147 | "Cannot attach to lwp %d: " | |
1148 | "thread is gone (%d: %s)\n", | |
1149 | lwpid, err, safe_strerror (err)); | |
1150 | } | |
1151 | } | |
1152 | else | |
1153 | { | |
f71f0b0d | 1154 | warning (_("Cannot attach to lwp %d: %s"), |
8784d563 PA |
1155 | lwpid, |
1156 | linux_ptrace_attach_fail_reason_string (ptid, | |
1157 | err)); | |
1158 | } | |
1159 | } | |
1160 | else | |
1161 | { | |
1162 | if (debug_linux_nat) | |
1163 | fprintf_unfiltered (gdb_stdlog, | |
1164 | "PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1165 | target_pid_to_str (ptid)); | |
1166 | ||
1167 | lp = add_lwp (ptid); | |
8784d563 PA |
1168 | |
1169 | /* The next time we wait for this LWP we'll see a SIGSTOP as | |
1170 | PTRACE_ATTACH brings it to a halt. */ | |
1171 | lp->signalled = 1; | |
1172 | ||
1173 | /* We need to wait for a stop before being able to make the | |
1174 | next ptrace call on this LWP. */ | |
1175 | lp->must_set_ptrace_flags = 1; | |
026a9174 PA |
1176 | |
1177 | /* So that wait collects the SIGSTOP. */ | |
1178 | lp->resumed = 1; | |
1179 | ||
1180 | /* Also add the LWP to gdb's thread list, in case a | |
1181 | matching libthread_db is not found (or the process uses | |
1182 | raw clone). */ | |
1183 | add_thread (lp->ptid); | |
1184 | set_running (lp->ptid, 1); | |
1185 | set_executing (lp->ptid, 1); | |
8784d563 PA |
1186 | } |
1187 | ||
1188 | return 1; | |
1189 | } | |
1190 | return 0; | |
1191 | } | |
1192 | ||
d6b0e80f | 1193 | static void |
c0939df1 | 1194 | linux_nat_attach (struct target_ops *ops, const char *args, int from_tty) |
d6b0e80f AC |
1195 | { |
1196 | struct lwp_info *lp; | |
d6b0e80f | 1197 | int status; |
af990527 | 1198 | ptid_t ptid; |
d6b0e80f | 1199 | |
2455069d | 1200 | /* Make sure we report all signals during attach. */ |
94bedb42 | 1201 | linux_nat_pass_signals (ops, 0, NULL); |
2455069d | 1202 | |
492d29ea | 1203 | TRY |
87b0bb13 JK |
1204 | { |
1205 | linux_ops->to_attach (ops, args, from_tty); | |
1206 | } | |
492d29ea | 1207 | CATCH (ex, RETURN_MASK_ERROR) |
87b0bb13 JK |
1208 | { |
1209 | pid_t pid = parse_pid_to_attach (args); | |
1210 | struct buffer buffer; | |
1211 | char *message, *buffer_s; | |
1212 | ||
1213 | message = xstrdup (ex.message); | |
1214 | make_cleanup (xfree, message); | |
1215 | ||
1216 | buffer_init (&buffer); | |
7ae1a6a6 | 1217 | linux_ptrace_attach_fail_reason (pid, &buffer); |
87b0bb13 JK |
1218 | |
1219 | buffer_grow_str0 (&buffer, ""); | |
1220 | buffer_s = buffer_finish (&buffer); | |
1221 | make_cleanup (xfree, buffer_s); | |
1222 | ||
7ae1a6a6 PA |
1223 | if (*buffer_s != '\0') |
1224 | throw_error (ex.error, "warning: %s\n%s", buffer_s, message); | |
1225 | else | |
1226 | throw_error (ex.error, "%s", message); | |
87b0bb13 | 1227 | } |
492d29ea | 1228 | END_CATCH |
d6b0e80f | 1229 | |
af990527 PA |
1230 | /* The ptrace base target adds the main thread with (pid,0,0) |
1231 | format. Decorate it with lwp info. */ | |
dfd4cc63 LM |
1232 | ptid = ptid_build (ptid_get_pid (inferior_ptid), |
1233 | ptid_get_pid (inferior_ptid), | |
1234 | 0); | |
af990527 PA |
1235 | thread_change_ptid (inferior_ptid, ptid); |
1236 | ||
9f0bdab8 | 1237 | /* Add the initial process as the first LWP to the list. */ |
26cb8b7c | 1238 | lp = add_initial_lwp (ptid); |
a0ef4274 | 1239 | |
4a6ed09b | 1240 | status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->signalled); |
dacc9cb2 PP |
1241 | if (!WIFSTOPPED (status)) |
1242 | { | |
1243 | if (WIFEXITED (status)) | |
1244 | { | |
1245 | int exit_code = WEXITSTATUS (status); | |
1246 | ||
1247 | target_terminal_ours (); | |
1248 | target_mourn_inferior (); | |
1249 | if (exit_code == 0) | |
1250 | error (_("Unable to attach: program exited normally.")); | |
1251 | else | |
1252 | error (_("Unable to attach: program exited with code %d."), | |
1253 | exit_code); | |
1254 | } | |
1255 | else if (WIFSIGNALED (status)) | |
1256 | { | |
2ea28649 | 1257 | enum gdb_signal signo; |
dacc9cb2 PP |
1258 | |
1259 | target_terminal_ours (); | |
1260 | target_mourn_inferior (); | |
1261 | ||
2ea28649 | 1262 | signo = gdb_signal_from_host (WTERMSIG (status)); |
dacc9cb2 PP |
1263 | error (_("Unable to attach: program terminated with signal " |
1264 | "%s, %s."), | |
2ea28649 PA |
1265 | gdb_signal_to_name (signo), |
1266 | gdb_signal_to_string (signo)); | |
dacc9cb2 PP |
1267 | } |
1268 | ||
1269 | internal_error (__FILE__, __LINE__, | |
1270 | _("unexpected status %d for PID %ld"), | |
dfd4cc63 | 1271 | status, (long) ptid_get_lwp (ptid)); |
dacc9cb2 PP |
1272 | } |
1273 | ||
a0ef4274 | 1274 | lp->stopped = 1; |
9f0bdab8 | 1275 | |
a0ef4274 | 1276 | /* Save the wait status to report later. */ |
d6b0e80f | 1277 | lp->resumed = 1; |
a0ef4274 DJ |
1278 | if (debug_linux_nat) |
1279 | fprintf_unfiltered (gdb_stdlog, | |
1280 | "LNA: waitpid %ld, saving status %s\n", | |
dfd4cc63 | 1281 | (long) ptid_get_pid (lp->ptid), status_to_str (status)); |
710151dd | 1282 | |
7feb7d06 PA |
1283 | lp->status = status; |
1284 | ||
8784d563 PA |
1285 | /* We must attach to every LWP. If /proc is mounted, use that to |
1286 | find them now. The inferior may be using raw clone instead of | |
1287 | using pthreads. But even if it is using pthreads, thread_db | |
1288 | walks structures in the inferior's address space to find the list | |
1289 | of threads/LWPs, and those structures may well be corrupted. | |
1290 | Note that once thread_db is loaded, we'll still use it to list | |
1291 | threads and associate pthread info with each LWP. */ | |
1292 | linux_proc_attach_tgid_threads (ptid_get_pid (lp->ptid), | |
1293 | attach_proc_task_lwp_callback); | |
1294 | ||
7feb7d06 | 1295 | if (target_can_async_p ()) |
6a3753b3 | 1296 | target_async (1); |
d6b0e80f AC |
1297 | } |
1298 | ||
ced2dffb PA |
1299 | /* Get pending signal of THREAD as a host signal number, for detaching |
1300 | purposes. This is the signal the thread last stopped for, which we | |
1301 | need to deliver to the thread when detaching, otherwise, it'd be | |
1302 | suppressed/lost. */ | |
1303 | ||
a0ef4274 | 1304 | static int |
ced2dffb | 1305 | get_detach_signal (struct lwp_info *lp) |
a0ef4274 | 1306 | { |
a493e3e2 | 1307 | enum gdb_signal signo = GDB_SIGNAL_0; |
ca2163eb PA |
1308 | |
1309 | /* If we paused threads momentarily, we may have stored pending | |
1310 | events in lp->status or lp->waitstatus (see stop_wait_callback), | |
1311 | and GDB core hasn't seen any signal for those threads. | |
1312 | Otherwise, the last signal reported to the core is found in the | |
1313 | thread object's stop_signal. | |
1314 | ||
1315 | There's a corner case that isn't handled here at present. Only | |
1316 | if the thread stopped with a TARGET_WAITKIND_STOPPED does | |
1317 | stop_signal make sense as a real signal to pass to the inferior. | |
1318 | Some catchpoint related events, like | |
1319 | TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set | |
a493e3e2 | 1320 | to GDB_SIGNAL_SIGTRAP when the catchpoint triggers. But, |
ca2163eb PA |
1321 | those traps are debug API (ptrace in our case) related and |
1322 | induced; the inferior wouldn't see them if it wasn't being | |
1323 | traced. Hence, we should never pass them to the inferior, even | |
1324 | when set to pass state. Since this corner case isn't handled by | |
1325 | infrun.c when proceeding with a signal, for consistency, neither | |
1326 | do we handle it here (or elsewhere in the file we check for | |
1327 | signal pass state). Normally SIGTRAP isn't set to pass state, so | |
1328 | this is really a corner case. */ | |
1329 | ||
1330 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
a493e3e2 | 1331 | signo = GDB_SIGNAL_0; /* a pending ptrace event, not a real signal. */ |
ca2163eb | 1332 | else if (lp->status) |
2ea28649 | 1333 | signo = gdb_signal_from_host (WSTOPSIG (lp->status)); |
fbea99ea | 1334 | else if (target_is_non_stop_p () && !is_executing (lp->ptid)) |
ca2163eb PA |
1335 | { |
1336 | struct thread_info *tp = find_thread_ptid (lp->ptid); | |
e0881a8e | 1337 | |
72b049d3 PA |
1338 | if (tp->suspend.waitstatus_pending_p) |
1339 | signo = tp->suspend.waitstatus.value.sig; | |
1340 | else | |
1341 | signo = tp->suspend.stop_signal; | |
ca2163eb | 1342 | } |
fbea99ea | 1343 | else if (!target_is_non_stop_p ()) |
a0ef4274 | 1344 | { |
ca2163eb PA |
1345 | struct target_waitstatus last; |
1346 | ptid_t last_ptid; | |
4c28f408 | 1347 | |
ca2163eb | 1348 | get_last_target_status (&last_ptid, &last); |
4c28f408 | 1349 | |
dfd4cc63 | 1350 | if (ptid_get_lwp (lp->ptid) == ptid_get_lwp (last_ptid)) |
ca2163eb | 1351 | { |
e09875d4 | 1352 | struct thread_info *tp = find_thread_ptid (lp->ptid); |
e0881a8e | 1353 | |
16c381f0 | 1354 | signo = tp->suspend.stop_signal; |
4c28f408 | 1355 | } |
ca2163eb | 1356 | } |
4c28f408 | 1357 | |
a493e3e2 | 1358 | if (signo == GDB_SIGNAL_0) |
ca2163eb PA |
1359 | { |
1360 | if (debug_linux_nat) | |
1361 | fprintf_unfiltered (gdb_stdlog, | |
1362 | "GPT: lwp %s has no pending signal\n", | |
1363 | target_pid_to_str (lp->ptid)); | |
1364 | } | |
1365 | else if (!signal_pass_state (signo)) | |
1366 | { | |
1367 | if (debug_linux_nat) | |
3e43a32a MS |
1368 | fprintf_unfiltered (gdb_stdlog, |
1369 | "GPT: lwp %s had signal %s, " | |
1370 | "but it is in no pass state\n", | |
ca2163eb | 1371 | target_pid_to_str (lp->ptid), |
2ea28649 | 1372 | gdb_signal_to_string (signo)); |
a0ef4274 | 1373 | } |
a0ef4274 | 1374 | else |
4c28f408 | 1375 | { |
ca2163eb PA |
1376 | if (debug_linux_nat) |
1377 | fprintf_unfiltered (gdb_stdlog, | |
1378 | "GPT: lwp %s has pending signal %s\n", | |
1379 | target_pid_to_str (lp->ptid), | |
2ea28649 | 1380 | gdb_signal_to_string (signo)); |
ced2dffb PA |
1381 | |
1382 | return gdb_signal_to_host (signo); | |
4c28f408 | 1383 | } |
a0ef4274 DJ |
1384 | |
1385 | return 0; | |
1386 | } | |
1387 | ||
ced2dffb PA |
1388 | /* Detach from LP. If SIGNO_P is non-NULL, then it points to the |
1389 | signal number that should be passed to the LWP when detaching. | |
1390 | Otherwise pass any pending signal the LWP may have, if any. */ | |
1391 | ||
1392 | static void | |
1393 | detach_one_lwp (struct lwp_info *lp, int *signo_p) | |
d6b0e80f | 1394 | { |
ced2dffb PA |
1395 | int lwpid = ptid_get_lwp (lp->ptid); |
1396 | int signo; | |
1397 | ||
d6b0e80f AC |
1398 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); |
1399 | ||
1400 | if (debug_linux_nat && lp->status) | |
1401 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1402 | strsignal (WSTOPSIG (lp->status)), | |
1403 | target_pid_to_str (lp->ptid)); | |
1404 | ||
a0ef4274 DJ |
1405 | /* If there is a pending SIGSTOP, get rid of it. */ |
1406 | if (lp->signalled) | |
d6b0e80f | 1407 | { |
d6b0e80f AC |
1408 | if (debug_linux_nat) |
1409 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1410 | "DC: Sending SIGCONT to %s\n", |
1411 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1412 | |
ced2dffb | 1413 | kill_lwp (lwpid, SIGCONT); |
d6b0e80f | 1414 | lp->signalled = 0; |
d6b0e80f AC |
1415 | } |
1416 | ||
ced2dffb | 1417 | if (signo_p == NULL) |
d6b0e80f | 1418 | { |
a0ef4274 | 1419 | /* Pass on any pending signal for this LWP. */ |
ced2dffb PA |
1420 | signo = get_detach_signal (lp); |
1421 | } | |
1422 | else | |
1423 | signo = *signo_p; | |
a0ef4274 | 1424 | |
ced2dffb PA |
1425 | /* Preparing to resume may try to write registers, and fail if the |
1426 | lwp is zombie. If that happens, ignore the error. We'll handle | |
1427 | it below, when detach fails with ESRCH. */ | |
1428 | TRY | |
1429 | { | |
7b50312a PA |
1430 | if (linux_nat_prepare_to_resume != NULL) |
1431 | linux_nat_prepare_to_resume (lp); | |
ced2dffb PA |
1432 | } |
1433 | CATCH (ex, RETURN_MASK_ERROR) | |
1434 | { | |
1435 | if (!check_ptrace_stopped_lwp_gone (lp)) | |
1436 | throw_exception (ex); | |
1437 | } | |
1438 | END_CATCH | |
d6b0e80f | 1439 | |
ced2dffb PA |
1440 | if (ptrace (PTRACE_DETACH, lwpid, 0, signo) < 0) |
1441 | { | |
1442 | int save_errno = errno; | |
1443 | ||
1444 | /* We know the thread exists, so ESRCH must mean the lwp is | |
1445 | zombie. This can happen if one of the already-detached | |
1446 | threads exits the whole thread group. In that case we're | |
1447 | still attached, and must reap the lwp. */ | |
1448 | if (save_errno == ESRCH) | |
1449 | { | |
1450 | int ret, status; | |
d6b0e80f | 1451 | |
ced2dffb PA |
1452 | ret = my_waitpid (lwpid, &status, __WALL); |
1453 | if (ret == -1) | |
1454 | { | |
1455 | warning (_("Couldn't reap LWP %d while detaching: %s"), | |
1456 | lwpid, strerror (errno)); | |
1457 | } | |
1458 | else if (!WIFEXITED (status) && !WIFSIGNALED (status)) | |
1459 | { | |
1460 | warning (_("Reaping LWP %d while detaching " | |
1461 | "returned unexpected status 0x%x"), | |
1462 | lwpid, status); | |
1463 | } | |
1464 | } | |
1465 | else | |
1466 | { | |
1467 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), | |
1468 | safe_strerror (save_errno)); | |
1469 | } | |
d6b0e80f | 1470 | } |
ced2dffb PA |
1471 | else if (debug_linux_nat) |
1472 | { | |
1473 | fprintf_unfiltered (gdb_stdlog, | |
1474 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1475 | target_pid_to_str (lp->ptid), | |
1476 | strsignal (signo)); | |
1477 | } | |
1478 | ||
1479 | delete_lwp (lp->ptid); | |
1480 | } | |
d6b0e80f | 1481 | |
ced2dffb PA |
1482 | static int |
1483 | detach_callback (struct lwp_info *lp, void *data) | |
1484 | { | |
1485 | /* We don't actually detach from the thread group leader just yet. | |
1486 | If the thread group exits, we must reap the zombie clone lwps | |
1487 | before we're able to reap the leader. */ | |
1488 | if (ptid_get_lwp (lp->ptid) != ptid_get_pid (lp->ptid)) | |
1489 | detach_one_lwp (lp, NULL); | |
d6b0e80f AC |
1490 | return 0; |
1491 | } | |
1492 | ||
1493 | static void | |
52554a0e | 1494 | linux_nat_detach (struct target_ops *ops, const char *args, int from_tty) |
d6b0e80f | 1495 | { |
b84876c2 | 1496 | int pid; |
d90e17a7 PA |
1497 | struct lwp_info *main_lwp; |
1498 | ||
dfd4cc63 | 1499 | pid = ptid_get_pid (inferior_ptid); |
a0ef4274 | 1500 | |
ae5e0686 MK |
1501 | /* Don't unregister from the event loop, as there may be other |
1502 | inferiors running. */ | |
b84876c2 | 1503 | |
4c28f408 PA |
1504 | /* Stop all threads before detaching. ptrace requires that the |
1505 | thread is stopped to sucessfully detach. */ | |
d90e17a7 | 1506 | iterate_over_lwps (pid_to_ptid (pid), stop_callback, NULL); |
4c28f408 PA |
1507 | /* ... and wait until all of them have reported back that |
1508 | they're no longer running. */ | |
d90e17a7 | 1509 | iterate_over_lwps (pid_to_ptid (pid), stop_wait_callback, NULL); |
4c28f408 | 1510 | |
d90e17a7 | 1511 | iterate_over_lwps (pid_to_ptid (pid), detach_callback, NULL); |
d6b0e80f AC |
1512 | |
1513 | /* Only the initial process should be left right now. */ | |
dfd4cc63 | 1514 | gdb_assert (num_lwps (ptid_get_pid (inferior_ptid)) == 1); |
d90e17a7 PA |
1515 | |
1516 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
d6b0e80f | 1517 | |
7a7d3353 PA |
1518 | if (forks_exist_p ()) |
1519 | { | |
1520 | /* Multi-fork case. The current inferior_ptid is being detached | |
1521 | from, but there are other viable forks to debug. Detach from | |
1522 | the current fork, and context-switch to the first | |
1523 | available. */ | |
1524 | linux_fork_detach (args, from_tty); | |
7a7d3353 PA |
1525 | } |
1526 | else | |
ced2dffb PA |
1527 | { |
1528 | int signo; | |
1529 | ||
1530 | target_announce_detach (from_tty); | |
1531 | ||
1532 | /* Pass on any pending signal for the last LWP, unless the user | |
1533 | requested detaching with a different signal (most likely 0, | |
1534 | meaning, discard the signal). */ | |
1535 | if (args != NULL) | |
1536 | signo = atoi (args); | |
1537 | else | |
1538 | signo = get_detach_signal (main_lwp); | |
1539 | ||
1540 | detach_one_lwp (main_lwp, &signo); | |
1541 | ||
1542 | inf_ptrace_detach_success (ops); | |
1543 | } | |
1544 | delete_lwp (main_lwp->ptid); | |
d6b0e80f AC |
1545 | } |
1546 | ||
8a99810d PA |
1547 | /* Resume execution of the inferior process. If STEP is nonzero, |
1548 | single-step it. If SIGNAL is nonzero, give it that signal. */ | |
1549 | ||
1550 | static void | |
23f238d3 PA |
1551 | linux_resume_one_lwp_throw (struct lwp_info *lp, int step, |
1552 | enum gdb_signal signo) | |
8a99810d | 1553 | { |
8a99810d | 1554 | lp->step = step; |
9c02b525 PA |
1555 | |
1556 | /* stop_pc doubles as the PC the LWP had when it was last resumed. | |
1557 | We only presently need that if the LWP is stepped though (to | |
1558 | handle the case of stepping a breakpoint instruction). */ | |
1559 | if (step) | |
1560 | { | |
1561 | struct regcache *regcache = get_thread_regcache (lp->ptid); | |
1562 | ||
1563 | lp->stop_pc = regcache_read_pc (regcache); | |
1564 | } | |
1565 | else | |
1566 | lp->stop_pc = 0; | |
1567 | ||
8a99810d PA |
1568 | if (linux_nat_prepare_to_resume != NULL) |
1569 | linux_nat_prepare_to_resume (lp); | |
90ad5e1d | 1570 | linux_ops->to_resume (linux_ops, lp->ptid, step, signo); |
23f238d3 PA |
1571 | |
1572 | /* Successfully resumed. Clear state that no longer makes sense, | |
1573 | and mark the LWP as running. Must not do this before resuming | |
1574 | otherwise if that fails other code will be confused. E.g., we'd | |
1575 | later try to stop the LWP and hang forever waiting for a stop | |
1576 | status. Note that we must not throw after this is cleared, | |
1577 | otherwise handle_zombie_lwp_error would get confused. */ | |
8a99810d | 1578 | lp->stopped = 0; |
1ad3de98 | 1579 | lp->core = -1; |
23f238d3 | 1580 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8a99810d PA |
1581 | registers_changed_ptid (lp->ptid); |
1582 | } | |
1583 | ||
23f238d3 PA |
1584 | /* Called when we try to resume a stopped LWP and that errors out. If |
1585 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
1586 | or about to become), discard the error, clear any pending status | |
1587 | the LWP may have, and return true (we'll collect the exit status | |
1588 | soon enough). Otherwise, return false. */ | |
1589 | ||
1590 | static int | |
1591 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
1592 | { | |
1593 | /* If we get an error after resuming the LWP successfully, we'd | |
1594 | confuse !T state for the LWP being gone. */ | |
1595 | gdb_assert (lp->stopped); | |
1596 | ||
1597 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
1598 | because even if ptrace failed with ESRCH, the tracee may be "not | |
1599 | yet fully dead", but already refusing ptrace requests. In that | |
1600 | case the tracee has 'R (Running)' state for a little bit | |
1601 | (observed in Linux 3.18). See also the note on ESRCH in the | |
1602 | ptrace(2) man page. Instead, check whether the LWP has any state | |
1603 | other than ptrace-stopped. */ | |
1604 | ||
1605 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
1606 | if (linux_proc_pid_is_trace_stopped_nowarn (ptid_get_lwp (lp->ptid)) == 0) | |
1607 | { | |
1608 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
1609 | lp->status = 0; | |
1610 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
1611 | return 1; | |
1612 | } | |
1613 | return 0; | |
1614 | } | |
1615 | ||
1616 | /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP | |
1617 | disappears while we try to resume it. */ | |
1618 | ||
1619 | static void | |
1620 | linux_resume_one_lwp (struct lwp_info *lp, int step, enum gdb_signal signo) | |
1621 | { | |
1622 | TRY | |
1623 | { | |
1624 | linux_resume_one_lwp_throw (lp, step, signo); | |
1625 | } | |
1626 | CATCH (ex, RETURN_MASK_ERROR) | |
1627 | { | |
1628 | if (!check_ptrace_stopped_lwp_gone (lp)) | |
1629 | throw_exception (ex); | |
1630 | } | |
1631 | END_CATCH | |
1632 | } | |
1633 | ||
d6b0e80f AC |
1634 | /* Resume LP. */ |
1635 | ||
25289eb2 | 1636 | static void |
e5ef252a | 1637 | resume_lwp (struct lwp_info *lp, int step, enum gdb_signal signo) |
d6b0e80f | 1638 | { |
25289eb2 | 1639 | if (lp->stopped) |
6c95b8df | 1640 | { |
c9657e70 | 1641 | struct inferior *inf = find_inferior_ptid (lp->ptid); |
25289eb2 PA |
1642 | |
1643 | if (inf->vfork_child != NULL) | |
1644 | { | |
1645 | if (debug_linux_nat) | |
1646 | fprintf_unfiltered (gdb_stdlog, | |
1647 | "RC: Not resuming %s (vfork parent)\n", | |
1648 | target_pid_to_str (lp->ptid)); | |
1649 | } | |
8a99810d | 1650 | else if (!lwp_status_pending_p (lp)) |
25289eb2 PA |
1651 | { |
1652 | if (debug_linux_nat) | |
1653 | fprintf_unfiltered (gdb_stdlog, | |
e5ef252a PA |
1654 | "RC: Resuming sibling %s, %s, %s\n", |
1655 | target_pid_to_str (lp->ptid), | |
1656 | (signo != GDB_SIGNAL_0 | |
1657 | ? strsignal (gdb_signal_to_host (signo)) | |
1658 | : "0"), | |
1659 | step ? "step" : "resume"); | |
25289eb2 | 1660 | |
8a99810d | 1661 | linux_resume_one_lwp (lp, step, signo); |
25289eb2 PA |
1662 | } |
1663 | else | |
1664 | { | |
1665 | if (debug_linux_nat) | |
1666 | fprintf_unfiltered (gdb_stdlog, | |
1667 | "RC: Not resuming sibling %s (has pending)\n", | |
1668 | target_pid_to_str (lp->ptid)); | |
1669 | } | |
6c95b8df | 1670 | } |
25289eb2 | 1671 | else |
d6b0e80f | 1672 | { |
d90e17a7 PA |
1673 | if (debug_linux_nat) |
1674 | fprintf_unfiltered (gdb_stdlog, | |
25289eb2 | 1675 | "RC: Not resuming sibling %s (not stopped)\n", |
d6b0e80f | 1676 | target_pid_to_str (lp->ptid)); |
d6b0e80f | 1677 | } |
25289eb2 | 1678 | } |
d6b0e80f | 1679 | |
8817a6f2 PA |
1680 | /* Callback for iterate_over_lwps. If LWP is EXCEPT, do nothing. |
1681 | Resume LWP with the last stop signal, if it is in pass state. */ | |
e5ef252a | 1682 | |
25289eb2 | 1683 | static int |
8817a6f2 | 1684 | linux_nat_resume_callback (struct lwp_info *lp, void *except) |
25289eb2 | 1685 | { |
e5ef252a PA |
1686 | enum gdb_signal signo = GDB_SIGNAL_0; |
1687 | ||
8817a6f2 PA |
1688 | if (lp == except) |
1689 | return 0; | |
1690 | ||
e5ef252a PA |
1691 | if (lp->stopped) |
1692 | { | |
1693 | struct thread_info *thread; | |
1694 | ||
1695 | thread = find_thread_ptid (lp->ptid); | |
1696 | if (thread != NULL) | |
1697 | { | |
70509625 | 1698 | signo = thread->suspend.stop_signal; |
e5ef252a PA |
1699 | thread->suspend.stop_signal = GDB_SIGNAL_0; |
1700 | } | |
1701 | } | |
1702 | ||
1703 | resume_lwp (lp, 0, signo); | |
d6b0e80f AC |
1704 | return 0; |
1705 | } | |
1706 | ||
1707 | static int | |
1708 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1709 | { | |
1710 | lp->resumed = 0; | |
25289eb2 | 1711 | lp->last_resume_kind = resume_stop; |
d6b0e80f AC |
1712 | return 0; |
1713 | } | |
1714 | ||
1715 | static int | |
1716 | resume_set_callback (struct lwp_info *lp, void *data) | |
1717 | { | |
1718 | lp->resumed = 1; | |
25289eb2 | 1719 | lp->last_resume_kind = resume_continue; |
d6b0e80f AC |
1720 | return 0; |
1721 | } | |
1722 | ||
1723 | static void | |
28439f5e | 1724 | linux_nat_resume (struct target_ops *ops, |
2ea28649 | 1725 | ptid_t ptid, int step, enum gdb_signal signo) |
d6b0e80f AC |
1726 | { |
1727 | struct lwp_info *lp; | |
d90e17a7 | 1728 | int resume_many; |
d6b0e80f | 1729 | |
76f50ad1 DJ |
1730 | if (debug_linux_nat) |
1731 | fprintf_unfiltered (gdb_stdlog, | |
1732 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1733 | step ? "step" : "resume", | |
1734 | target_pid_to_str (ptid), | |
a493e3e2 | 1735 | (signo != GDB_SIGNAL_0 |
2ea28649 | 1736 | ? strsignal (gdb_signal_to_host (signo)) : "0"), |
76f50ad1 DJ |
1737 | target_pid_to_str (inferior_ptid)); |
1738 | ||
d6b0e80f | 1739 | /* A specific PTID means `step only this process id'. */ |
d90e17a7 PA |
1740 | resume_many = (ptid_equal (minus_one_ptid, ptid) |
1741 | || ptid_is_pid (ptid)); | |
4c28f408 | 1742 | |
e3e9f5a2 PA |
1743 | /* Mark the lwps we're resuming as resumed. */ |
1744 | iterate_over_lwps (ptid, resume_set_callback, NULL); | |
d6b0e80f | 1745 | |
d90e17a7 PA |
1746 | /* See if it's the current inferior that should be handled |
1747 | specially. */ | |
1748 | if (resume_many) | |
1749 | lp = find_lwp_pid (inferior_ptid); | |
1750 | else | |
1751 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1752 | gdb_assert (lp != NULL); |
d6b0e80f | 1753 | |
9f0bdab8 | 1754 | /* Remember if we're stepping. */ |
25289eb2 | 1755 | lp->last_resume_kind = step ? resume_step : resume_continue; |
d6b0e80f | 1756 | |
9f0bdab8 DJ |
1757 | /* If we have a pending wait status for this thread, there is no |
1758 | point in resuming the process. But first make sure that | |
1759 | linux_nat_wait won't preemptively handle the event - we | |
1760 | should never take this short-circuit if we are going to | |
1761 | leave LP running, since we have skipped resuming all the | |
1762 | other threads. This bit of code needs to be synchronized | |
1763 | with linux_nat_wait. */ | |
76f50ad1 | 1764 | |
9f0bdab8 DJ |
1765 | if (lp->status && WIFSTOPPED (lp->status)) |
1766 | { | |
2455069d UW |
1767 | if (!lp->step |
1768 | && WSTOPSIG (lp->status) | |
1769 | && sigismember (&pass_mask, WSTOPSIG (lp->status))) | |
d6b0e80f | 1770 | { |
9f0bdab8 DJ |
1771 | if (debug_linux_nat) |
1772 | fprintf_unfiltered (gdb_stdlog, | |
1773 | "LLR: Not short circuiting for ignored " | |
1774 | "status 0x%x\n", lp->status); | |
1775 | ||
d6b0e80f AC |
1776 | /* FIXME: What should we do if we are supposed to continue |
1777 | this thread with a signal? */ | |
a493e3e2 | 1778 | gdb_assert (signo == GDB_SIGNAL_0); |
2ea28649 | 1779 | signo = gdb_signal_from_host (WSTOPSIG (lp->status)); |
9f0bdab8 DJ |
1780 | lp->status = 0; |
1781 | } | |
1782 | } | |
76f50ad1 | 1783 | |
8a99810d | 1784 | if (lwp_status_pending_p (lp)) |
9f0bdab8 DJ |
1785 | { |
1786 | /* FIXME: What should we do if we are supposed to continue | |
1787 | this thread with a signal? */ | |
a493e3e2 | 1788 | gdb_assert (signo == GDB_SIGNAL_0); |
76f50ad1 | 1789 | |
9f0bdab8 DJ |
1790 | if (debug_linux_nat) |
1791 | fprintf_unfiltered (gdb_stdlog, | |
1792 | "LLR: Short circuiting for status 0x%x\n", | |
1793 | lp->status); | |
d6b0e80f | 1794 | |
7feb7d06 PA |
1795 | if (target_can_async_p ()) |
1796 | { | |
6a3753b3 | 1797 | target_async (1); |
7feb7d06 PA |
1798 | /* Tell the event loop we have something to process. */ |
1799 | async_file_mark (); | |
1800 | } | |
9f0bdab8 | 1801 | return; |
d6b0e80f AC |
1802 | } |
1803 | ||
d90e17a7 | 1804 | if (resume_many) |
8817a6f2 | 1805 | iterate_over_lwps (ptid, linux_nat_resume_callback, lp); |
d90e17a7 | 1806 | |
d6b0e80f AC |
1807 | if (debug_linux_nat) |
1808 | fprintf_unfiltered (gdb_stdlog, | |
1809 | "LLR: %s %s, %s (resume event thread)\n", | |
1810 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2bf6fb9d | 1811 | target_pid_to_str (lp->ptid), |
a493e3e2 | 1812 | (signo != GDB_SIGNAL_0 |
2ea28649 | 1813 | ? strsignal (gdb_signal_to_host (signo)) : "0")); |
b84876c2 | 1814 | |
2bf6fb9d PA |
1815 | linux_resume_one_lwp (lp, step, signo); |
1816 | ||
b84876c2 | 1817 | if (target_can_async_p ()) |
6a3753b3 | 1818 | target_async (1); |
d6b0e80f AC |
1819 | } |
1820 | ||
c5f62d5f | 1821 | /* Send a signal to an LWP. */ |
d6b0e80f AC |
1822 | |
1823 | static int | |
1824 | kill_lwp (int lwpid, int signo) | |
1825 | { | |
4a6ed09b | 1826 | int ret; |
d6b0e80f | 1827 | |
4a6ed09b PA |
1828 | errno = 0; |
1829 | ret = syscall (__NR_tkill, lwpid, signo); | |
1830 | if (errno == ENOSYS) | |
1831 | { | |
1832 | /* If tkill fails, then we are not using nptl threads, a | |
1833 | configuration we no longer support. */ | |
1834 | perror_with_name (("tkill")); | |
1835 | } | |
1836 | return ret; | |
d6b0e80f AC |
1837 | } |
1838 | ||
ca2163eb PA |
1839 | /* Handle a GNU/Linux syscall trap wait response. If we see a syscall |
1840 | event, check if the core is interested in it: if not, ignore the | |
1841 | event, and keep waiting; otherwise, we need to toggle the LWP's | |
1842 | syscall entry/exit status, since the ptrace event itself doesn't | |
1843 | indicate it, and report the trap to higher layers. */ | |
1844 | ||
1845 | static int | |
1846 | linux_handle_syscall_trap (struct lwp_info *lp, int stopping) | |
1847 | { | |
1848 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
1849 | struct gdbarch *gdbarch = target_thread_architecture (lp->ptid); | |
1850 | int syscall_number = (int) gdbarch_get_syscall_number (gdbarch, lp->ptid); | |
1851 | ||
1852 | if (stopping) | |
1853 | { | |
1854 | /* If we're stopping threads, there's a SIGSTOP pending, which | |
1855 | makes it so that the LWP reports an immediate syscall return, | |
1856 | followed by the SIGSTOP. Skip seeing that "return" using | |
1857 | PTRACE_CONT directly, and let stop_wait_callback collect the | |
1858 | SIGSTOP. Later when the thread is resumed, a new syscall | |
1859 | entry event. If we didn't do this (and returned 0), we'd | |
1860 | leave a syscall entry pending, and our caller, by using | |
1861 | PTRACE_CONT to collect the SIGSTOP, skips the syscall return | |
1862 | itself. Later, when the user re-resumes this LWP, we'd see | |
1863 | another syscall entry event and we'd mistake it for a return. | |
1864 | ||
1865 | If stop_wait_callback didn't force the SIGSTOP out of the LWP | |
1866 | (leaving immediately with LWP->signalled set, without issuing | |
1867 | a PTRACE_CONT), it would still be problematic to leave this | |
1868 | syscall enter pending, as later when the thread is resumed, | |
1869 | it would then see the same syscall exit mentioned above, | |
1870 | followed by the delayed SIGSTOP, while the syscall didn't | |
1871 | actually get to execute. It seems it would be even more | |
1872 | confusing to the user. */ | |
1873 | ||
1874 | if (debug_linux_nat) | |
1875 | fprintf_unfiltered (gdb_stdlog, | |
1876 | "LHST: ignoring syscall %d " | |
1877 | "for LWP %ld (stopping threads), " | |
1878 | "resuming with PTRACE_CONT for SIGSTOP\n", | |
1879 | syscall_number, | |
dfd4cc63 | 1880 | ptid_get_lwp (lp->ptid)); |
ca2163eb PA |
1881 | |
1882 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
dfd4cc63 | 1883 | ptrace (PTRACE_CONT, ptid_get_lwp (lp->ptid), 0, 0); |
8817a6f2 | 1884 | lp->stopped = 0; |
ca2163eb PA |
1885 | return 1; |
1886 | } | |
1887 | ||
bfd09d20 JS |
1888 | /* Always update the entry/return state, even if this particular |
1889 | syscall isn't interesting to the core now. In async mode, | |
1890 | the user could install a new catchpoint for this syscall | |
1891 | between syscall enter/return, and we'll need to know to | |
1892 | report a syscall return if that happens. */ | |
1893 | lp->syscall_state = (lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
1894 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
1895 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
1896 | ||
ca2163eb PA |
1897 | if (catch_syscall_enabled ()) |
1898 | { | |
ca2163eb PA |
1899 | if (catching_syscall_number (syscall_number)) |
1900 | { | |
1901 | /* Alright, an event to report. */ | |
1902 | ourstatus->kind = lp->syscall_state; | |
1903 | ourstatus->value.syscall_number = syscall_number; | |
1904 | ||
1905 | if (debug_linux_nat) | |
1906 | fprintf_unfiltered (gdb_stdlog, | |
1907 | "LHST: stopping for %s of syscall %d" | |
1908 | " for LWP %ld\n", | |
3e43a32a MS |
1909 | lp->syscall_state |
1910 | == TARGET_WAITKIND_SYSCALL_ENTRY | |
ca2163eb PA |
1911 | ? "entry" : "return", |
1912 | syscall_number, | |
dfd4cc63 | 1913 | ptid_get_lwp (lp->ptid)); |
ca2163eb PA |
1914 | return 0; |
1915 | } | |
1916 | ||
1917 | if (debug_linux_nat) | |
1918 | fprintf_unfiltered (gdb_stdlog, | |
1919 | "LHST: ignoring %s of syscall %d " | |
1920 | "for LWP %ld\n", | |
1921 | lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
1922 | ? "entry" : "return", | |
1923 | syscall_number, | |
dfd4cc63 | 1924 | ptid_get_lwp (lp->ptid)); |
ca2163eb PA |
1925 | } |
1926 | else | |
1927 | { | |
1928 | /* If we had been syscall tracing, and hence used PT_SYSCALL | |
1929 | before on this LWP, it could happen that the user removes all | |
1930 | syscall catchpoints before we get to process this event. | |
1931 | There are two noteworthy issues here: | |
1932 | ||
1933 | - When stopped at a syscall entry event, resuming with | |
1934 | PT_STEP still resumes executing the syscall and reports a | |
1935 | syscall return. | |
1936 | ||
1937 | - Only PT_SYSCALL catches syscall enters. If we last | |
1938 | single-stepped this thread, then this event can't be a | |
1939 | syscall enter. If we last single-stepped this thread, this | |
1940 | has to be a syscall exit. | |
1941 | ||
1942 | The points above mean that the next resume, be it PT_STEP or | |
1943 | PT_CONTINUE, can not trigger a syscall trace event. */ | |
1944 | if (debug_linux_nat) | |
1945 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
1946 | "LHST: caught syscall event " |
1947 | "with no syscall catchpoints." | |
ca2163eb PA |
1948 | " %d for LWP %ld, ignoring\n", |
1949 | syscall_number, | |
dfd4cc63 | 1950 | ptid_get_lwp (lp->ptid)); |
ca2163eb PA |
1951 | lp->syscall_state = TARGET_WAITKIND_IGNORE; |
1952 | } | |
1953 | ||
1954 | /* The core isn't interested in this event. For efficiency, avoid | |
1955 | stopping all threads only to have the core resume them all again. | |
1956 | Since we're not stopping threads, if we're still syscall tracing | |
1957 | and not stepping, we can't use PTRACE_CONT here, as we'd miss any | |
1958 | subsequent syscall. Simply resume using the inf-ptrace layer, | |
1959 | which knows when to use PT_SYSCALL or PT_CONTINUE. */ | |
1960 | ||
8a99810d | 1961 | linux_resume_one_lwp (lp, lp->step, GDB_SIGNAL_0); |
ca2163eb PA |
1962 | return 1; |
1963 | } | |
1964 | ||
3d799a95 DJ |
1965 | /* Handle a GNU/Linux extended wait response. If we see a clone |
1966 | event, we need to add the new LWP to our list (and not report the | |
1967 | trap to higher layers). This function returns non-zero if the | |
1968 | event should be ignored and we should wait again. If STOPPING is | |
1969 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
1970 | |
1971 | static int | |
4dd63d48 | 1972 | linux_handle_extended_wait (struct lwp_info *lp, int status) |
d6b0e80f | 1973 | { |
dfd4cc63 | 1974 | int pid = ptid_get_lwp (lp->ptid); |
3d799a95 | 1975 | struct target_waitstatus *ourstatus = &lp->waitstatus; |
89a5711c | 1976 | int event = linux_ptrace_get_extended_event (status); |
d6b0e80f | 1977 | |
bfd09d20 JS |
1978 | /* All extended events we currently use are mid-syscall. Only |
1979 | PTRACE_EVENT_STOP is delivered more like a signal-stop, but | |
1980 | you have to be using PTRACE_SEIZE to get that. */ | |
1981 | lp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
1982 | ||
3d799a95 DJ |
1983 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
1984 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 1985 | { |
3d799a95 DJ |
1986 | unsigned long new_pid; |
1987 | int ret; | |
1988 | ||
1989 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 1990 | |
3d799a95 DJ |
1991 | /* If we haven't already seen the new PID stop, wait for it now. */ |
1992 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
1993 | { | |
1994 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
1995 | hits the SIGSTOP, but we're already attached. */ | |
4a6ed09b | 1996 | ret = my_waitpid (new_pid, &status, __WALL); |
3d799a95 DJ |
1997 | if (ret == -1) |
1998 | perror_with_name (_("waiting for new child")); | |
1999 | else if (ret != new_pid) | |
2000 | internal_error (__FILE__, __LINE__, | |
2001 | _("wait returned unexpected PID %d"), ret); | |
2002 | else if (!WIFSTOPPED (status)) | |
2003 | internal_error (__FILE__, __LINE__, | |
2004 | _("wait returned unexpected status 0x%x"), status); | |
2005 | } | |
2006 | ||
3a3e9ee3 | 2007 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 | 2008 | |
26cb8b7c PA |
2009 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
2010 | { | |
2011 | /* The arch-specific native code may need to know about new | |
2012 | forks even if those end up never mapped to an | |
2013 | inferior. */ | |
2014 | if (linux_nat_new_fork != NULL) | |
2015 | linux_nat_new_fork (lp, new_pid); | |
2016 | } | |
2017 | ||
2277426b | 2018 | if (event == PTRACE_EVENT_FORK |
dfd4cc63 | 2019 | && linux_fork_checkpointing_p (ptid_get_pid (lp->ptid))) |
2277426b | 2020 | { |
2277426b PA |
2021 | /* Handle checkpointing by linux-fork.c here as a special |
2022 | case. We don't want the follow-fork-mode or 'catch fork' | |
2023 | to interfere with this. */ | |
2024 | ||
2025 | /* This won't actually modify the breakpoint list, but will | |
2026 | physically remove the breakpoints from the child. */ | |
d80ee84f | 2027 | detach_breakpoints (ptid_build (new_pid, new_pid, 0)); |
2277426b PA |
2028 | |
2029 | /* Retain child fork in ptrace (stopped) state. */ | |
14571dad MS |
2030 | if (!find_fork_pid (new_pid)) |
2031 | add_fork (new_pid); | |
2277426b PA |
2032 | |
2033 | /* Report as spurious, so that infrun doesn't want to follow | |
2034 | this fork. We're actually doing an infcall in | |
2035 | linux-fork.c. */ | |
2036 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
2277426b PA |
2037 | |
2038 | /* Report the stop to the core. */ | |
2039 | return 0; | |
2040 | } | |
2041 | ||
3d799a95 DJ |
2042 | if (event == PTRACE_EVENT_FORK) |
2043 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
2044 | else if (event == PTRACE_EVENT_VFORK) | |
2045 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
4dd63d48 | 2046 | else if (event == PTRACE_EVENT_CLONE) |
3d799a95 | 2047 | { |
78768c4a JK |
2048 | struct lwp_info *new_lp; |
2049 | ||
3d799a95 | 2050 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
78768c4a | 2051 | |
3c4d7e12 PA |
2052 | if (debug_linux_nat) |
2053 | fprintf_unfiltered (gdb_stdlog, | |
2054 | "LHEW: Got clone event " | |
2055 | "from LWP %d, new child is LWP %ld\n", | |
2056 | pid, new_pid); | |
2057 | ||
dfd4cc63 | 2058 | new_lp = add_lwp (ptid_build (ptid_get_pid (lp->ptid), new_pid, 0)); |
4c28f408 | 2059 | new_lp->stopped = 1; |
4dd63d48 | 2060 | new_lp->resumed = 1; |
d6b0e80f | 2061 | |
2db9a427 PA |
2062 | /* If the thread_db layer is active, let it record the user |
2063 | level thread id and status, and add the thread to GDB's | |
2064 | list. */ | |
2065 | if (!thread_db_notice_clone (lp->ptid, new_lp->ptid)) | |
3d799a95 | 2066 | { |
2db9a427 PA |
2067 | /* The process is not using thread_db. Add the LWP to |
2068 | GDB's list. */ | |
2069 | target_post_attach (ptid_get_lwp (new_lp->ptid)); | |
2070 | add_thread (new_lp->ptid); | |
2071 | } | |
4c28f408 | 2072 | |
2ee52aa4 | 2073 | /* Even if we're stopping the thread for some reason |
4dd63d48 PA |
2074 | internal to this module, from the perspective of infrun |
2075 | and the user/frontend, this new thread is running until | |
2076 | it next reports a stop. */ | |
2ee52aa4 | 2077 | set_running (new_lp->ptid, 1); |
4dd63d48 | 2078 | set_executing (new_lp->ptid, 1); |
4c28f408 | 2079 | |
4dd63d48 | 2080 | if (WSTOPSIG (status) != SIGSTOP) |
79395f92 | 2081 | { |
4dd63d48 PA |
2082 | /* This can happen if someone starts sending signals to |
2083 | the new thread before it gets a chance to run, which | |
2084 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
2085 | This is an unlikely case, and harder to handle for | |
2086 | fork / vfork than for clone, so we do not try - but | |
2087 | we handle it for clone events here. */ | |
2088 | ||
2089 | new_lp->signalled = 1; | |
2090 | ||
79395f92 PA |
2091 | /* We created NEW_LP so it cannot yet contain STATUS. */ |
2092 | gdb_assert (new_lp->status == 0); | |
2093 | ||
2094 | /* Save the wait status to report later. */ | |
2095 | if (debug_linux_nat) | |
2096 | fprintf_unfiltered (gdb_stdlog, | |
2097 | "LHEW: waitpid of new LWP %ld, " | |
2098 | "saving status %s\n", | |
dfd4cc63 | 2099 | (long) ptid_get_lwp (new_lp->ptid), |
79395f92 PA |
2100 | status_to_str (status)); |
2101 | new_lp->status = status; | |
2102 | } | |
aa01bd36 PA |
2103 | else if (report_thread_events) |
2104 | { | |
2105 | new_lp->waitstatus.kind = TARGET_WAITKIND_THREAD_CREATED; | |
2106 | new_lp->status = status; | |
2107 | } | |
79395f92 | 2108 | |
3d799a95 DJ |
2109 | return 1; |
2110 | } | |
2111 | ||
2112 | return 0; | |
d6b0e80f AC |
2113 | } |
2114 | ||
3d799a95 DJ |
2115 | if (event == PTRACE_EVENT_EXEC) |
2116 | { | |
a75724bc PA |
2117 | if (debug_linux_nat) |
2118 | fprintf_unfiltered (gdb_stdlog, | |
2119 | "LHEW: Got exec event from LWP %ld\n", | |
dfd4cc63 | 2120 | ptid_get_lwp (lp->ptid)); |
a75724bc | 2121 | |
3d799a95 DJ |
2122 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
2123 | ourstatus->value.execd_pathname | |
8dd27370 | 2124 | = xstrdup (linux_child_pid_to_exec_file (NULL, pid)); |
3d799a95 | 2125 | |
8af756ef PA |
2126 | /* The thread that execed must have been resumed, but, when a |
2127 | thread execs, it changes its tid to the tgid, and the old | |
2128 | tgid thread might have not been resumed. */ | |
2129 | lp->resumed = 1; | |
6c95b8df PA |
2130 | return 0; |
2131 | } | |
2132 | ||
2133 | if (event == PTRACE_EVENT_VFORK_DONE) | |
2134 | { | |
2135 | if (current_inferior ()->waiting_for_vfork_done) | |
3d799a95 | 2136 | { |
6c95b8df | 2137 | if (debug_linux_nat) |
3e43a32a MS |
2138 | fprintf_unfiltered (gdb_stdlog, |
2139 | "LHEW: Got expected PTRACE_EVENT_" | |
2140 | "VFORK_DONE from LWP %ld: stopping\n", | |
dfd4cc63 | 2141 | ptid_get_lwp (lp->ptid)); |
3d799a95 | 2142 | |
6c95b8df PA |
2143 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; |
2144 | return 0; | |
3d799a95 DJ |
2145 | } |
2146 | ||
6c95b8df | 2147 | if (debug_linux_nat) |
3e43a32a MS |
2148 | fprintf_unfiltered (gdb_stdlog, |
2149 | "LHEW: Got PTRACE_EVENT_VFORK_DONE " | |
20ba1ce6 | 2150 | "from LWP %ld: ignoring\n", |
dfd4cc63 | 2151 | ptid_get_lwp (lp->ptid)); |
6c95b8df | 2152 | return 1; |
3d799a95 DJ |
2153 | } |
2154 | ||
2155 | internal_error (__FILE__, __LINE__, | |
2156 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
2157 | } |
2158 | ||
2159 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has | |
2160 | exited. */ | |
2161 | ||
2162 | static int | |
2163 | wait_lwp (struct lwp_info *lp) | |
2164 | { | |
2165 | pid_t pid; | |
432b4d03 | 2166 | int status = 0; |
d6b0e80f | 2167 | int thread_dead = 0; |
432b4d03 | 2168 | sigset_t prev_mask; |
d6b0e80f AC |
2169 | |
2170 | gdb_assert (!lp->stopped); | |
2171 | gdb_assert (lp->status == 0); | |
2172 | ||
432b4d03 JK |
2173 | /* Make sure SIGCHLD is blocked for sigsuspend avoiding a race below. */ |
2174 | block_child_signals (&prev_mask); | |
2175 | ||
2176 | for (;;) | |
d6b0e80f | 2177 | { |
4a6ed09b | 2178 | pid = my_waitpid (ptid_get_lwp (lp->ptid), &status, __WALL | WNOHANG); |
a9f4bb21 PA |
2179 | if (pid == -1 && errno == ECHILD) |
2180 | { | |
2181 | /* The thread has previously exited. We need to delete it | |
4a6ed09b PA |
2182 | now because if this was a non-leader thread execing, we |
2183 | won't get an exit event. See comments on exec events at | |
2184 | the top of the file. */ | |
a9f4bb21 PA |
2185 | thread_dead = 1; |
2186 | if (debug_linux_nat) | |
2187 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
2188 | target_pid_to_str (lp->ptid)); | |
2189 | } | |
432b4d03 JK |
2190 | if (pid != 0) |
2191 | break; | |
2192 | ||
2193 | /* Bugs 10970, 12702. | |
2194 | Thread group leader may have exited in which case we'll lock up in | |
2195 | waitpid if there are other threads, even if they are all zombies too. | |
2196 | Basically, we're not supposed to use waitpid this way. | |
4a6ed09b PA |
2197 | tkill(pid,0) cannot be used here as it gets ESRCH for both |
2198 | for zombie and running processes. | |
432b4d03 JK |
2199 | |
2200 | As a workaround, check if we're waiting for the thread group leader and | |
2201 | if it's a zombie, and avoid calling waitpid if it is. | |
2202 | ||
2203 | This is racy, what if the tgl becomes a zombie right after we check? | |
2204 | Therefore always use WNOHANG with sigsuspend - it is equivalent to | |
5f572dec | 2205 | waiting waitpid but linux_proc_pid_is_zombie is safe this way. */ |
432b4d03 | 2206 | |
dfd4cc63 LM |
2207 | if (ptid_get_pid (lp->ptid) == ptid_get_lwp (lp->ptid) |
2208 | && linux_proc_pid_is_zombie (ptid_get_lwp (lp->ptid))) | |
d6b0e80f | 2209 | { |
d6b0e80f AC |
2210 | thread_dead = 1; |
2211 | if (debug_linux_nat) | |
432b4d03 JK |
2212 | fprintf_unfiltered (gdb_stdlog, |
2213 | "WL: Thread group leader %s vanished.\n", | |
d6b0e80f | 2214 | target_pid_to_str (lp->ptid)); |
432b4d03 | 2215 | break; |
d6b0e80f | 2216 | } |
432b4d03 JK |
2217 | |
2218 | /* Wait for next SIGCHLD and try again. This may let SIGCHLD handlers | |
2219 | get invoked despite our caller had them intentionally blocked by | |
2220 | block_child_signals. This is sensitive only to the loop of | |
2221 | linux_nat_wait_1 and there if we get called my_waitpid gets called | |
2222 | again before it gets to sigsuspend so we can safely let the handlers | |
2223 | get executed here. */ | |
2224 | ||
d36bf488 DE |
2225 | if (debug_linux_nat) |
2226 | fprintf_unfiltered (gdb_stdlog, "WL: about to sigsuspend\n"); | |
432b4d03 JK |
2227 | sigsuspend (&suspend_mask); |
2228 | } | |
2229 | ||
2230 | restore_child_signals_mask (&prev_mask); | |
2231 | ||
d6b0e80f AC |
2232 | if (!thread_dead) |
2233 | { | |
dfd4cc63 | 2234 | gdb_assert (pid == ptid_get_lwp (lp->ptid)); |
d6b0e80f AC |
2235 | |
2236 | if (debug_linux_nat) | |
2237 | { | |
2238 | fprintf_unfiltered (gdb_stdlog, | |
2239 | "WL: waitpid %s received %s\n", | |
2240 | target_pid_to_str (lp->ptid), | |
2241 | status_to_str (status)); | |
2242 | } | |
d6b0e80f | 2243 | |
a9f4bb21 PA |
2244 | /* Check if the thread has exited. */ |
2245 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
2246 | { | |
aa01bd36 PA |
2247 | if (report_thread_events |
2248 | || ptid_get_pid (lp->ptid) == ptid_get_lwp (lp->ptid)) | |
69dde7dc PA |
2249 | { |
2250 | if (debug_linux_nat) | |
aa01bd36 | 2251 | fprintf_unfiltered (gdb_stdlog, "WL: LWP %d exited.\n", |
69dde7dc PA |
2252 | ptid_get_pid (lp->ptid)); |
2253 | ||
aa01bd36 | 2254 | /* If this is the leader exiting, it means the whole |
69dde7dc PA |
2255 | process is gone. Store the status to report to the |
2256 | core. Store it in lp->waitstatus, because lp->status | |
2257 | would be ambiguous (W_EXITCODE(0,0) == 0). */ | |
2258 | store_waitstatus (&lp->waitstatus, status); | |
2259 | return 0; | |
2260 | } | |
2261 | ||
a9f4bb21 PA |
2262 | thread_dead = 1; |
2263 | if (debug_linux_nat) | |
2264 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
2265 | target_pid_to_str (lp->ptid)); | |
2266 | } | |
d6b0e80f AC |
2267 | } |
2268 | ||
2269 | if (thread_dead) | |
2270 | { | |
e26af52f | 2271 | exit_lwp (lp); |
d6b0e80f AC |
2272 | return 0; |
2273 | } | |
2274 | ||
2275 | gdb_assert (WIFSTOPPED (status)); | |
8817a6f2 | 2276 | lp->stopped = 1; |
d6b0e80f | 2277 | |
8784d563 PA |
2278 | if (lp->must_set_ptrace_flags) |
2279 | { | |
2280 | struct inferior *inf = find_inferior_pid (ptid_get_pid (lp->ptid)); | |
de0d863e | 2281 | int options = linux_nat_ptrace_options (inf->attach_flag); |
8784d563 | 2282 | |
de0d863e | 2283 | linux_enable_event_reporting (ptid_get_lwp (lp->ptid), options); |
8784d563 PA |
2284 | lp->must_set_ptrace_flags = 0; |
2285 | } | |
2286 | ||
ca2163eb PA |
2287 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
2288 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
2289 | { | |
2290 | /* No longer need the sysgood bit. The ptrace event ends up | |
2291 | recorded in lp->waitstatus if we care for it. We can carry | |
2292 | on handling the event like a regular SIGTRAP from here | |
2293 | on. */ | |
2294 | status = W_STOPCODE (SIGTRAP); | |
2295 | if (linux_handle_syscall_trap (lp, 1)) | |
2296 | return wait_lwp (lp); | |
2297 | } | |
bfd09d20 JS |
2298 | else |
2299 | { | |
2300 | /* Almost all other ptrace-stops are known to be outside of system | |
2301 | calls, with further exceptions in linux_handle_extended_wait. */ | |
2302 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2303 | } | |
ca2163eb | 2304 | |
d6b0e80f | 2305 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
89a5711c DB |
2306 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP |
2307 | && linux_is_extended_waitstatus (status)) | |
d6b0e80f AC |
2308 | { |
2309 | if (debug_linux_nat) | |
2310 | fprintf_unfiltered (gdb_stdlog, | |
2311 | "WL: Handling extended status 0x%06x\n", | |
2312 | status); | |
4dd63d48 | 2313 | linux_handle_extended_wait (lp, status); |
20ba1ce6 | 2314 | return 0; |
d6b0e80f AC |
2315 | } |
2316 | ||
2317 | return status; | |
2318 | } | |
2319 | ||
2320 | /* Send a SIGSTOP to LP. */ | |
2321 | ||
2322 | static int | |
2323 | stop_callback (struct lwp_info *lp, void *data) | |
2324 | { | |
2325 | if (!lp->stopped && !lp->signalled) | |
2326 | { | |
2327 | int ret; | |
2328 | ||
2329 | if (debug_linux_nat) | |
2330 | { | |
2331 | fprintf_unfiltered (gdb_stdlog, | |
2332 | "SC: kill %s **<SIGSTOP>**\n", | |
2333 | target_pid_to_str (lp->ptid)); | |
2334 | } | |
2335 | errno = 0; | |
dfd4cc63 | 2336 | ret = kill_lwp (ptid_get_lwp (lp->ptid), SIGSTOP); |
d6b0e80f AC |
2337 | if (debug_linux_nat) |
2338 | { | |
2339 | fprintf_unfiltered (gdb_stdlog, | |
2340 | "SC: lwp kill %d %s\n", | |
2341 | ret, | |
2342 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
2343 | } | |
2344 | ||
2345 | lp->signalled = 1; | |
2346 | gdb_assert (lp->status == 0); | |
2347 | } | |
2348 | ||
2349 | return 0; | |
2350 | } | |
2351 | ||
7b50312a PA |
2352 | /* Request a stop on LWP. */ |
2353 | ||
2354 | void | |
2355 | linux_stop_lwp (struct lwp_info *lwp) | |
2356 | { | |
2357 | stop_callback (lwp, NULL); | |
2358 | } | |
2359 | ||
2db9a427 PA |
2360 | /* See linux-nat.h */ |
2361 | ||
2362 | void | |
2363 | linux_stop_and_wait_all_lwps (void) | |
2364 | { | |
2365 | /* Stop all LWP's ... */ | |
2366 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); | |
2367 | ||
2368 | /* ... and wait until all of them have reported back that | |
2369 | they're no longer running. */ | |
2370 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); | |
2371 | } | |
2372 | ||
2373 | /* See linux-nat.h */ | |
2374 | ||
2375 | void | |
2376 | linux_unstop_all_lwps (void) | |
2377 | { | |
2378 | iterate_over_lwps (minus_one_ptid, | |
2379 | resume_stopped_resumed_lwps, &minus_one_ptid); | |
2380 | } | |
2381 | ||
57380f4e | 2382 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
2383 | |
2384 | static int | |
57380f4e DJ |
2385 | linux_nat_has_pending_sigint (int pid) |
2386 | { | |
2387 | sigset_t pending, blocked, ignored; | |
57380f4e DJ |
2388 | |
2389 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
2390 | ||
2391 | if (sigismember (&pending, SIGINT) | |
2392 | && !sigismember (&ignored, SIGINT)) | |
2393 | return 1; | |
2394 | ||
2395 | return 0; | |
2396 | } | |
2397 | ||
2398 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
2399 | ||
2400 | static int | |
2401 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2402 | { |
57380f4e DJ |
2403 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2404 | flag to consume the next one. */ | |
2405 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2406 | && WSTOPSIG (lp->status) == SIGINT) | |
2407 | lp->status = 0; | |
2408 | else | |
2409 | lp->ignore_sigint = 1; | |
2410 | ||
2411 | return 0; | |
2412 | } | |
2413 | ||
2414 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2415 | This function is called after we know the LWP has stopped; if the LWP | |
2416 | stopped before the expected SIGINT was delivered, then it will never have | |
2417 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2418 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2419 | |
57380f4e DJ |
2420 | static void |
2421 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2422 | { | |
2423 | if (!lp->ignore_sigint) | |
2424 | return; | |
2425 | ||
dfd4cc63 | 2426 | if (!linux_nat_has_pending_sigint (ptid_get_lwp (lp->ptid))) |
57380f4e DJ |
2427 | { |
2428 | if (debug_linux_nat) | |
2429 | fprintf_unfiltered (gdb_stdlog, | |
2430 | "MCIS: Clearing bogus flag for %s\n", | |
2431 | target_pid_to_str (lp->ptid)); | |
2432 | lp->ignore_sigint = 0; | |
2433 | } | |
2434 | } | |
2435 | ||
ebec9a0f PA |
2436 | /* Fetch the possible triggered data watchpoint info and store it in |
2437 | LP. | |
2438 | ||
2439 | On some archs, like x86, that use debug registers to set | |
2440 | watchpoints, it's possible that the way to know which watched | |
2441 | address trapped, is to check the register that is used to select | |
2442 | which address to watch. Problem is, between setting the watchpoint | |
2443 | and reading back which data address trapped, the user may change | |
2444 | the set of watchpoints, and, as a consequence, GDB changes the | |
2445 | debug registers in the inferior. To avoid reading back a stale | |
2446 | stopped-data-address when that happens, we cache in LP the fact | |
2447 | that a watchpoint trapped, and the corresponding data address, as | |
2448 | soon as we see LP stop with a SIGTRAP. If GDB changes the debug | |
2449 | registers meanwhile, we have the cached data we can rely on. */ | |
2450 | ||
9c02b525 PA |
2451 | static int |
2452 | check_stopped_by_watchpoint (struct lwp_info *lp) | |
ebec9a0f PA |
2453 | { |
2454 | struct cleanup *old_chain; | |
2455 | ||
2456 | if (linux_ops->to_stopped_by_watchpoint == NULL) | |
9c02b525 | 2457 | return 0; |
ebec9a0f PA |
2458 | |
2459 | old_chain = save_inferior_ptid (); | |
2460 | inferior_ptid = lp->ptid; | |
2461 | ||
9c02b525 | 2462 | if (linux_ops->to_stopped_by_watchpoint (linux_ops)) |
ebec9a0f | 2463 | { |
15c66dd6 | 2464 | lp->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; |
9c02b525 | 2465 | |
ebec9a0f PA |
2466 | if (linux_ops->to_stopped_data_address != NULL) |
2467 | lp->stopped_data_address_p = | |
2468 | linux_ops->to_stopped_data_address (¤t_target, | |
2469 | &lp->stopped_data_address); | |
2470 | else | |
2471 | lp->stopped_data_address_p = 0; | |
2472 | } | |
2473 | ||
2474 | do_cleanups (old_chain); | |
9c02b525 | 2475 | |
15c66dd6 | 2476 | return lp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
9c02b525 PA |
2477 | } |
2478 | ||
9c02b525 | 2479 | /* Returns true if the LWP had stopped for a watchpoint. */ |
ebec9a0f PA |
2480 | |
2481 | static int | |
6a109b6b | 2482 | linux_nat_stopped_by_watchpoint (struct target_ops *ops) |
ebec9a0f PA |
2483 | { |
2484 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2485 | ||
2486 | gdb_assert (lp != NULL); | |
2487 | ||
15c66dd6 | 2488 | return lp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
ebec9a0f PA |
2489 | } |
2490 | ||
2491 | static int | |
2492 | linux_nat_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p) | |
2493 | { | |
2494 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2495 | ||
2496 | gdb_assert (lp != NULL); | |
2497 | ||
2498 | *addr_p = lp->stopped_data_address; | |
2499 | ||
2500 | return lp->stopped_data_address_p; | |
2501 | } | |
2502 | ||
26ab7092 JK |
2503 | /* Commonly any breakpoint / watchpoint generate only SIGTRAP. */ |
2504 | ||
2505 | static int | |
2506 | sigtrap_is_event (int status) | |
2507 | { | |
2508 | return WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP; | |
2509 | } | |
2510 | ||
26ab7092 JK |
2511 | /* Set alternative SIGTRAP-like events recognizer. If |
2512 | breakpoint_inserted_here_p there then gdbarch_decr_pc_after_break will be | |
2513 | applied. */ | |
2514 | ||
2515 | void | |
2516 | linux_nat_set_status_is_event (struct target_ops *t, | |
2517 | int (*status_is_event) (int status)) | |
2518 | { | |
2519 | linux_nat_status_is_event = status_is_event; | |
2520 | } | |
2521 | ||
57380f4e DJ |
2522 | /* Wait until LP is stopped. */ |
2523 | ||
2524 | static int | |
2525 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2526 | { | |
c9657e70 | 2527 | struct inferior *inf = find_inferior_ptid (lp->ptid); |
6c95b8df PA |
2528 | |
2529 | /* If this is a vfork parent, bail out, it is not going to report | |
2530 | any SIGSTOP until the vfork is done with. */ | |
2531 | if (inf->vfork_child != NULL) | |
2532 | return 0; | |
2533 | ||
d6b0e80f AC |
2534 | if (!lp->stopped) |
2535 | { | |
2536 | int status; | |
2537 | ||
2538 | status = wait_lwp (lp); | |
2539 | if (status == 0) | |
2540 | return 0; | |
2541 | ||
57380f4e DJ |
2542 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2543 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2544 | { |
57380f4e | 2545 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2546 | |
2547 | errno = 0; | |
dfd4cc63 | 2548 | ptrace (PTRACE_CONT, ptid_get_lwp (lp->ptid), 0, 0); |
8817a6f2 | 2549 | lp->stopped = 0; |
d6b0e80f AC |
2550 | if (debug_linux_nat) |
2551 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2552 | "PTRACE_CONT %s, 0, 0 (%s) " |
2553 | "(discarding SIGINT)\n", | |
d6b0e80f AC |
2554 | target_pid_to_str (lp->ptid), |
2555 | errno ? safe_strerror (errno) : "OK"); | |
2556 | ||
57380f4e | 2557 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2558 | } |
2559 | ||
57380f4e DJ |
2560 | maybe_clear_ignore_sigint (lp); |
2561 | ||
d6b0e80f AC |
2562 | if (WSTOPSIG (status) != SIGSTOP) |
2563 | { | |
e5ef252a | 2564 | /* The thread was stopped with a signal other than SIGSTOP. */ |
7feb7d06 | 2565 | |
e5ef252a PA |
2566 | if (debug_linux_nat) |
2567 | fprintf_unfiltered (gdb_stdlog, | |
2568 | "SWC: Pending event %s in %s\n", | |
2569 | status_to_str ((int) status), | |
2570 | target_pid_to_str (lp->ptid)); | |
2571 | ||
2572 | /* Save the sigtrap event. */ | |
2573 | lp->status = status; | |
e5ef252a | 2574 | gdb_assert (lp->signalled); |
e7ad2f14 | 2575 | save_stop_reason (lp); |
d6b0e80f AC |
2576 | } |
2577 | else | |
2578 | { | |
2579 | /* We caught the SIGSTOP that we intended to catch, so | |
2580 | there's no SIGSTOP pending. */ | |
e5ef252a PA |
2581 | |
2582 | if (debug_linux_nat) | |
2583 | fprintf_unfiltered (gdb_stdlog, | |
2bf6fb9d | 2584 | "SWC: Expected SIGSTOP caught for %s.\n", |
e5ef252a PA |
2585 | target_pid_to_str (lp->ptid)); |
2586 | ||
e5ef252a PA |
2587 | /* Reset SIGNALLED only after the stop_wait_callback call |
2588 | above as it does gdb_assert on SIGNALLED. */ | |
d6b0e80f AC |
2589 | lp->signalled = 0; |
2590 | } | |
2591 | } | |
2592 | ||
2593 | return 0; | |
2594 | } | |
2595 | ||
9c02b525 PA |
2596 | /* Return non-zero if LP has a wait status pending. Discard the |
2597 | pending event and resume the LWP if the event that originally | |
2598 | caused the stop became uninteresting. */ | |
d6b0e80f AC |
2599 | |
2600 | static int | |
2601 | status_callback (struct lwp_info *lp, void *data) | |
2602 | { | |
2603 | /* Only report a pending wait status if we pretend that this has | |
2604 | indeed been resumed. */ | |
ca2163eb PA |
2605 | if (!lp->resumed) |
2606 | return 0; | |
2607 | ||
eb54c8bf PA |
2608 | if (!lwp_status_pending_p (lp)) |
2609 | return 0; | |
2610 | ||
15c66dd6 PA |
2611 | if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
2612 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) | |
9c02b525 PA |
2613 | { |
2614 | struct regcache *regcache = get_thread_regcache (lp->ptid); | |
9c02b525 PA |
2615 | CORE_ADDR pc; |
2616 | int discard = 0; | |
2617 | ||
9c02b525 PA |
2618 | pc = regcache_read_pc (regcache); |
2619 | ||
2620 | if (pc != lp->stop_pc) | |
2621 | { | |
2622 | if (debug_linux_nat) | |
2623 | fprintf_unfiltered (gdb_stdlog, | |
2624 | "SC: PC of %s changed. was=%s, now=%s\n", | |
2625 | target_pid_to_str (lp->ptid), | |
2626 | paddress (target_gdbarch (), lp->stop_pc), | |
2627 | paddress (target_gdbarch (), pc)); | |
2628 | discard = 1; | |
2629 | } | |
faf09f01 PA |
2630 | |
2631 | #if !USE_SIGTRAP_SIGINFO | |
9c02b525 PA |
2632 | else if (!breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) |
2633 | { | |
2634 | if (debug_linux_nat) | |
2635 | fprintf_unfiltered (gdb_stdlog, | |
2636 | "SC: previous breakpoint of %s, at %s gone\n", | |
2637 | target_pid_to_str (lp->ptid), | |
2638 | paddress (target_gdbarch (), lp->stop_pc)); | |
2639 | ||
2640 | discard = 1; | |
2641 | } | |
faf09f01 | 2642 | #endif |
9c02b525 PA |
2643 | |
2644 | if (discard) | |
2645 | { | |
2646 | if (debug_linux_nat) | |
2647 | fprintf_unfiltered (gdb_stdlog, | |
2648 | "SC: pending event of %s cancelled.\n", | |
2649 | target_pid_to_str (lp->ptid)); | |
2650 | ||
2651 | lp->status = 0; | |
2652 | linux_resume_one_lwp (lp, lp->step, GDB_SIGNAL_0); | |
2653 | return 0; | |
2654 | } | |
9c02b525 PA |
2655 | } |
2656 | ||
eb54c8bf | 2657 | return 1; |
d6b0e80f AC |
2658 | } |
2659 | ||
d6b0e80f AC |
2660 | /* Count the LWP's that have had events. */ |
2661 | ||
2662 | static int | |
2663 | count_events_callback (struct lwp_info *lp, void *data) | |
2664 | { | |
9a3c8263 | 2665 | int *count = (int *) data; |
d6b0e80f AC |
2666 | |
2667 | gdb_assert (count != NULL); | |
2668 | ||
9c02b525 PA |
2669 | /* Select only resumed LWPs that have an event pending. */ |
2670 | if (lp->resumed && lwp_status_pending_p (lp)) | |
d6b0e80f AC |
2671 | (*count)++; |
2672 | ||
2673 | return 0; | |
2674 | } | |
2675 | ||
2676 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2677 | ||
2678 | static int | |
2679 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2680 | { | |
25289eb2 PA |
2681 | if (lp->last_resume_kind == resume_step |
2682 | && lp->status != 0) | |
d6b0e80f AC |
2683 | return 1; |
2684 | else | |
2685 | return 0; | |
2686 | } | |
2687 | ||
8a99810d PA |
2688 | /* Returns true if LP has a status pending. */ |
2689 | ||
2690 | static int | |
2691 | lwp_status_pending_p (struct lwp_info *lp) | |
2692 | { | |
2693 | /* We check for lp->waitstatus in addition to lp->status, because we | |
2694 | can have pending process exits recorded in lp->status and | |
2695 | W_EXITCODE(0,0) happens to be 0. */ | |
2696 | return lp->status != 0 || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE; | |
2697 | } | |
2698 | ||
b90fc188 | 2699 | /* Select the Nth LWP that has had an event. */ |
d6b0e80f AC |
2700 | |
2701 | static int | |
2702 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2703 | { | |
9a3c8263 | 2704 | int *selector = (int *) data; |
d6b0e80f AC |
2705 | |
2706 | gdb_assert (selector != NULL); | |
2707 | ||
9c02b525 PA |
2708 | /* Select only resumed LWPs that have an event pending. */ |
2709 | if (lp->resumed && lwp_status_pending_p (lp)) | |
d6b0e80f AC |
2710 | if ((*selector)-- == 0) |
2711 | return 1; | |
2712 | ||
2713 | return 0; | |
2714 | } | |
2715 | ||
e7ad2f14 PA |
2716 | /* Called when the LWP stopped for a signal/trap. If it stopped for a |
2717 | trap check what caused it (breakpoint, watchpoint, trace, etc.), | |
2718 | and save the result in the LWP's stop_reason field. If it stopped | |
2719 | for a breakpoint, decrement the PC if necessary on the lwp's | |
2720 | architecture. */ | |
9c02b525 | 2721 | |
e7ad2f14 PA |
2722 | static void |
2723 | save_stop_reason (struct lwp_info *lp) | |
710151dd | 2724 | { |
e7ad2f14 PA |
2725 | struct regcache *regcache; |
2726 | struct gdbarch *gdbarch; | |
515630c5 | 2727 | CORE_ADDR pc; |
9c02b525 | 2728 | CORE_ADDR sw_bp_pc; |
faf09f01 PA |
2729 | #if USE_SIGTRAP_SIGINFO |
2730 | siginfo_t siginfo; | |
2731 | #endif | |
9c02b525 | 2732 | |
e7ad2f14 PA |
2733 | gdb_assert (lp->stop_reason == TARGET_STOPPED_BY_NO_REASON); |
2734 | gdb_assert (lp->status != 0); | |
2735 | ||
2736 | if (!linux_nat_status_is_event (lp->status)) | |
2737 | return; | |
2738 | ||
2739 | regcache = get_thread_regcache (lp->ptid); | |
2740 | gdbarch = get_regcache_arch (regcache); | |
2741 | ||
9c02b525 | 2742 | pc = regcache_read_pc (regcache); |
527a273a | 2743 | sw_bp_pc = pc - gdbarch_decr_pc_after_break (gdbarch); |
515630c5 | 2744 | |
faf09f01 PA |
2745 | #if USE_SIGTRAP_SIGINFO |
2746 | if (linux_nat_get_siginfo (lp->ptid, &siginfo)) | |
2747 | { | |
2748 | if (siginfo.si_signo == SIGTRAP) | |
2749 | { | |
e7ad2f14 PA |
2750 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code) |
2751 | && GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) | |
faf09f01 | 2752 | { |
e7ad2f14 PA |
2753 | /* The si_code is ambiguous on this arch -- check debug |
2754 | registers. */ | |
2755 | if (!check_stopped_by_watchpoint (lp)) | |
2756 | lp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
2757 | } | |
2758 | else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) | |
2759 | { | |
2760 | /* If we determine the LWP stopped for a SW breakpoint, | |
2761 | trust it. Particularly don't check watchpoint | |
2762 | registers, because at least on s390, we'd find | |
2763 | stopped-by-watchpoint as long as there's a watchpoint | |
2764 | set. */ | |
faf09f01 | 2765 | lp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
faf09f01 | 2766 | } |
e7ad2f14 | 2767 | else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) |
faf09f01 | 2768 | { |
e7ad2f14 PA |
2769 | /* This can indicate either a hardware breakpoint or |
2770 | hardware watchpoint. Check debug registers. */ | |
2771 | if (!check_stopped_by_watchpoint (lp)) | |
2772 | lp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
faf09f01 | 2773 | } |
2bf6fb9d PA |
2774 | else if (siginfo.si_code == TRAP_TRACE) |
2775 | { | |
2776 | if (debug_linux_nat) | |
2777 | fprintf_unfiltered (gdb_stdlog, | |
2778 | "CSBB: %s stopped by trace\n", | |
2779 | target_pid_to_str (lp->ptid)); | |
e7ad2f14 PA |
2780 | |
2781 | /* We may have single stepped an instruction that | |
2782 | triggered a watchpoint. In that case, on some | |
2783 | architectures (such as x86), instead of TRAP_HWBKPT, | |
2784 | si_code indicates TRAP_TRACE, and we need to check | |
2785 | the debug registers separately. */ | |
2786 | check_stopped_by_watchpoint (lp); | |
2bf6fb9d | 2787 | } |
faf09f01 PA |
2788 | } |
2789 | } | |
2790 | #else | |
9c02b525 PA |
2791 | if ((!lp->step || lp->stop_pc == sw_bp_pc) |
2792 | && software_breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
2793 | sw_bp_pc)) | |
710151dd | 2794 | { |
9c02b525 PA |
2795 | /* The LWP was either continued, or stepped a software |
2796 | breakpoint instruction. */ | |
e7ad2f14 PA |
2797 | lp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
2798 | } | |
2799 | ||
2800 | if (hardware_breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
2801 | lp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
2802 | ||
2803 | if (lp->stop_reason == TARGET_STOPPED_BY_NO_REASON) | |
2804 | check_stopped_by_watchpoint (lp); | |
2805 | #endif | |
2806 | ||
2807 | if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) | |
2808 | { | |
710151dd PA |
2809 | if (debug_linux_nat) |
2810 | fprintf_unfiltered (gdb_stdlog, | |
2bf6fb9d | 2811 | "CSBB: %s stopped by software breakpoint\n", |
710151dd PA |
2812 | target_pid_to_str (lp->ptid)); |
2813 | ||
2814 | /* Back up the PC if necessary. */ | |
9c02b525 PA |
2815 | if (pc != sw_bp_pc) |
2816 | regcache_write_pc (regcache, sw_bp_pc); | |
515630c5 | 2817 | |
e7ad2f14 PA |
2818 | /* Update this so we record the correct stop PC below. */ |
2819 | pc = sw_bp_pc; | |
710151dd | 2820 | } |
e7ad2f14 | 2821 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) |
9c02b525 PA |
2822 | { |
2823 | if (debug_linux_nat) | |
2824 | fprintf_unfiltered (gdb_stdlog, | |
e7ad2f14 PA |
2825 | "CSBB: %s stopped by hardware breakpoint\n", |
2826 | target_pid_to_str (lp->ptid)); | |
2827 | } | |
2828 | else if (lp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) | |
2829 | { | |
2830 | if (debug_linux_nat) | |
2831 | fprintf_unfiltered (gdb_stdlog, | |
2832 | "CSBB: %s stopped by hardware watchpoint\n", | |
9c02b525 | 2833 | target_pid_to_str (lp->ptid)); |
9c02b525 | 2834 | } |
d6b0e80f | 2835 | |
e7ad2f14 | 2836 | lp->stop_pc = pc; |
d6b0e80f AC |
2837 | } |
2838 | ||
faf09f01 PA |
2839 | |
2840 | /* Returns true if the LWP had stopped for a software breakpoint. */ | |
2841 | ||
2842 | static int | |
2843 | linux_nat_stopped_by_sw_breakpoint (struct target_ops *ops) | |
2844 | { | |
2845 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2846 | ||
2847 | gdb_assert (lp != NULL); | |
2848 | ||
2849 | return lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT; | |
2850 | } | |
2851 | ||
2852 | /* Implement the supports_stopped_by_sw_breakpoint method. */ | |
2853 | ||
2854 | static int | |
2855 | linux_nat_supports_stopped_by_sw_breakpoint (struct target_ops *ops) | |
2856 | { | |
2857 | return USE_SIGTRAP_SIGINFO; | |
2858 | } | |
2859 | ||
2860 | /* Returns true if the LWP had stopped for a hardware | |
2861 | breakpoint/watchpoint. */ | |
2862 | ||
2863 | static int | |
2864 | linux_nat_stopped_by_hw_breakpoint (struct target_ops *ops) | |
2865 | { | |
2866 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2867 | ||
2868 | gdb_assert (lp != NULL); | |
2869 | ||
2870 | return lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT; | |
2871 | } | |
2872 | ||
2873 | /* Implement the supports_stopped_by_hw_breakpoint method. */ | |
2874 | ||
2875 | static int | |
2876 | linux_nat_supports_stopped_by_hw_breakpoint (struct target_ops *ops) | |
2877 | { | |
2878 | return USE_SIGTRAP_SIGINFO; | |
2879 | } | |
2880 | ||
d6b0e80f AC |
2881 | /* Select one LWP out of those that have events pending. */ |
2882 | ||
2883 | static void | |
d90e17a7 | 2884 | select_event_lwp (ptid_t filter, struct lwp_info **orig_lp, int *status) |
d6b0e80f AC |
2885 | { |
2886 | int num_events = 0; | |
2887 | int random_selector; | |
9c02b525 | 2888 | struct lwp_info *event_lp = NULL; |
d6b0e80f | 2889 | |
ac264b3b | 2890 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
2891 | (*orig_lp)->status = *status; |
2892 | ||
9c02b525 PA |
2893 | /* In all-stop, give preference to the LWP that is being |
2894 | single-stepped. There will be at most one, and it will be the | |
2895 | LWP that the core is most interested in. If we didn't do this, | |
2896 | then we'd have to handle pending step SIGTRAPs somehow in case | |
2897 | the core later continues the previously-stepped thread, as | |
2898 | otherwise we'd report the pending SIGTRAP then, and the core, not | |
2899 | having stepped the thread, wouldn't understand what the trap was | |
2900 | for, and therefore would report it to the user as a random | |
2901 | signal. */ | |
fbea99ea | 2902 | if (!target_is_non_stop_p ()) |
d6b0e80f | 2903 | { |
9c02b525 PA |
2904 | event_lp = iterate_over_lwps (filter, |
2905 | select_singlestep_lwp_callback, NULL); | |
2906 | if (event_lp != NULL) | |
2907 | { | |
2908 | if (debug_linux_nat) | |
2909 | fprintf_unfiltered (gdb_stdlog, | |
2910 | "SEL: Select single-step %s\n", | |
2911 | target_pid_to_str (event_lp->ptid)); | |
2912 | } | |
d6b0e80f | 2913 | } |
9c02b525 PA |
2914 | |
2915 | if (event_lp == NULL) | |
d6b0e80f | 2916 | { |
9c02b525 | 2917 | /* Pick one at random, out of those which have had events. */ |
d6b0e80f | 2918 | |
9c02b525 | 2919 | /* First see how many events we have. */ |
d90e17a7 | 2920 | iterate_over_lwps (filter, count_events_callback, &num_events); |
8bf3b159 | 2921 | gdb_assert (num_events > 0); |
d6b0e80f | 2922 | |
9c02b525 PA |
2923 | /* Now randomly pick a LWP out of those that have had |
2924 | events. */ | |
d6b0e80f AC |
2925 | random_selector = (int) |
2926 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2927 | ||
2928 | if (debug_linux_nat && num_events > 1) | |
2929 | fprintf_unfiltered (gdb_stdlog, | |
9c02b525 | 2930 | "SEL: Found %d events, selecting #%d\n", |
d6b0e80f AC |
2931 | num_events, random_selector); |
2932 | ||
d90e17a7 PA |
2933 | event_lp = iterate_over_lwps (filter, |
2934 | select_event_lwp_callback, | |
d6b0e80f AC |
2935 | &random_selector); |
2936 | } | |
2937 | ||
2938 | if (event_lp != NULL) | |
2939 | { | |
2940 | /* Switch the event LWP. */ | |
2941 | *orig_lp = event_lp; | |
2942 | *status = event_lp->status; | |
2943 | } | |
2944 | ||
2945 | /* Flush the wait status for the event LWP. */ | |
2946 | (*orig_lp)->status = 0; | |
2947 | } | |
2948 | ||
2949 | /* Return non-zero if LP has been resumed. */ | |
2950 | ||
2951 | static int | |
2952 | resumed_callback (struct lwp_info *lp, void *data) | |
2953 | { | |
2954 | return lp->resumed; | |
2955 | } | |
2956 | ||
02f3fc28 | 2957 | /* Check if we should go on and pass this event to common code. |
9c02b525 | 2958 | Return the affected lwp if we are, or NULL otherwise. */ |
12d9289a | 2959 | |
02f3fc28 | 2960 | static struct lwp_info * |
9c02b525 | 2961 | linux_nat_filter_event (int lwpid, int status) |
02f3fc28 PA |
2962 | { |
2963 | struct lwp_info *lp; | |
89a5711c | 2964 | int event = linux_ptrace_get_extended_event (status); |
02f3fc28 PA |
2965 | |
2966 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
2967 | ||
2968 | /* Check for stop events reported by a process we didn't already | |
2969 | know about - anything not already in our LWP list. | |
2970 | ||
2971 | If we're expecting to receive stopped processes after | |
2972 | fork, vfork, and clone events, then we'll just add the | |
2973 | new one to our list and go back to waiting for the event | |
2974 | to be reported - the stopped process might be returned | |
0e5bf2a8 PA |
2975 | from waitpid before or after the event is. |
2976 | ||
2977 | But note the case of a non-leader thread exec'ing after the | |
2978 | leader having exited, and gone from our lists. The non-leader | |
2979 | thread changes its tid to the tgid. */ | |
2980 | ||
2981 | if (WIFSTOPPED (status) && lp == NULL | |
89a5711c | 2982 | && (WSTOPSIG (status) == SIGTRAP && event == PTRACE_EVENT_EXEC)) |
0e5bf2a8 PA |
2983 | { |
2984 | /* A multi-thread exec after we had seen the leader exiting. */ | |
2985 | if (debug_linux_nat) | |
2986 | fprintf_unfiltered (gdb_stdlog, | |
2987 | "LLW: Re-adding thread group leader LWP %d.\n", | |
2988 | lwpid); | |
2989 | ||
dfd4cc63 | 2990 | lp = add_lwp (ptid_build (lwpid, lwpid, 0)); |
0e5bf2a8 PA |
2991 | lp->stopped = 1; |
2992 | lp->resumed = 1; | |
2993 | add_thread (lp->ptid); | |
2994 | } | |
2995 | ||
02f3fc28 PA |
2996 | if (WIFSTOPPED (status) && !lp) |
2997 | { | |
3b27ef47 PA |
2998 | if (debug_linux_nat) |
2999 | fprintf_unfiltered (gdb_stdlog, | |
3000 | "LHEW: saving LWP %ld status %s in stopped_pids list\n", | |
3001 | (long) lwpid, status_to_str (status)); | |
84636d28 | 3002 | add_to_pid_list (&stopped_pids, lwpid, status); |
02f3fc28 PA |
3003 | return NULL; |
3004 | } | |
3005 | ||
3006 | /* Make sure we don't report an event for the exit of an LWP not in | |
1777feb0 | 3007 | our list, i.e. not part of the current process. This can happen |
fd62cb89 | 3008 | if we detach from a program we originally forked and then it |
02f3fc28 PA |
3009 | exits. */ |
3010 | if (!WIFSTOPPED (status) && !lp) | |
3011 | return NULL; | |
3012 | ||
8817a6f2 PA |
3013 | /* This LWP is stopped now. (And if dead, this prevents it from |
3014 | ever being continued.) */ | |
3015 | lp->stopped = 1; | |
3016 | ||
8784d563 PA |
3017 | if (WIFSTOPPED (status) && lp->must_set_ptrace_flags) |
3018 | { | |
3019 | struct inferior *inf = find_inferior_pid (ptid_get_pid (lp->ptid)); | |
de0d863e | 3020 | int options = linux_nat_ptrace_options (inf->attach_flag); |
8784d563 | 3021 | |
de0d863e | 3022 | linux_enable_event_reporting (ptid_get_lwp (lp->ptid), options); |
8784d563 PA |
3023 | lp->must_set_ptrace_flags = 0; |
3024 | } | |
3025 | ||
ca2163eb PA |
3026 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
3027 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
3028 | { | |
3029 | /* No longer need the sysgood bit. The ptrace event ends up | |
3030 | recorded in lp->waitstatus if we care for it. We can carry | |
3031 | on handling the event like a regular SIGTRAP from here | |
3032 | on. */ | |
3033 | status = W_STOPCODE (SIGTRAP); | |
3034 | if (linux_handle_syscall_trap (lp, 0)) | |
3035 | return NULL; | |
3036 | } | |
bfd09d20 JS |
3037 | else |
3038 | { | |
3039 | /* Almost all other ptrace-stops are known to be outside of system | |
3040 | calls, with further exceptions in linux_handle_extended_wait. */ | |
3041 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
3042 | } | |
02f3fc28 | 3043 | |
ca2163eb | 3044 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
89a5711c DB |
3045 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP |
3046 | && linux_is_extended_waitstatus (status)) | |
02f3fc28 PA |
3047 | { |
3048 | if (debug_linux_nat) | |
3049 | fprintf_unfiltered (gdb_stdlog, | |
3050 | "LLW: Handling extended status 0x%06x\n", | |
3051 | status); | |
4dd63d48 | 3052 | if (linux_handle_extended_wait (lp, status)) |
02f3fc28 PA |
3053 | return NULL; |
3054 | } | |
3055 | ||
3056 | /* Check if the thread has exited. */ | |
9c02b525 PA |
3057 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
3058 | { | |
aa01bd36 PA |
3059 | if (!report_thread_events |
3060 | && num_lwps (ptid_get_pid (lp->ptid)) > 1) | |
02f3fc28 | 3061 | { |
9c02b525 PA |
3062 | if (debug_linux_nat) |
3063 | fprintf_unfiltered (gdb_stdlog, | |
3064 | "LLW: %s exited.\n", | |
3065 | target_pid_to_str (lp->ptid)); | |
3066 | ||
4a6ed09b PA |
3067 | /* If there is at least one more LWP, then the exit signal |
3068 | was not the end of the debugged application and should be | |
3069 | ignored. */ | |
3070 | exit_lwp (lp); | |
3071 | return NULL; | |
02f3fc28 PA |
3072 | } |
3073 | ||
77598427 PA |
3074 | /* Note that even if the leader was ptrace-stopped, it can still |
3075 | exit, if e.g., some other thread brings down the whole | |
3076 | process (calls `exit'). So don't assert that the lwp is | |
3077 | resumed. */ | |
02f3fc28 PA |
3078 | if (debug_linux_nat) |
3079 | fprintf_unfiltered (gdb_stdlog, | |
aa01bd36 | 3080 | "LWP %ld exited (resumed=%d)\n", |
77598427 | 3081 | ptid_get_lwp (lp->ptid), lp->resumed); |
02f3fc28 | 3082 | |
9c02b525 PA |
3083 | /* Dead LWP's aren't expected to reported a pending sigstop. */ |
3084 | lp->signalled = 0; | |
3085 | ||
3086 | /* Store the pending event in the waitstatus, because | |
3087 | W_EXITCODE(0,0) == 0. */ | |
3088 | store_waitstatus (&lp->waitstatus, status); | |
3089 | return lp; | |
02f3fc28 PA |
3090 | } |
3091 | ||
02f3fc28 PA |
3092 | /* Make sure we don't report a SIGSTOP that we sent ourselves in |
3093 | an attempt to stop an LWP. */ | |
3094 | if (lp->signalled | |
3095 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
3096 | { | |
02f3fc28 PA |
3097 | lp->signalled = 0; |
3098 | ||
2bf6fb9d | 3099 | if (lp->last_resume_kind == resume_stop) |
25289eb2 | 3100 | { |
2bf6fb9d PA |
3101 | if (debug_linux_nat) |
3102 | fprintf_unfiltered (gdb_stdlog, | |
3103 | "LLW: resume_stop SIGSTOP caught for %s.\n", | |
3104 | target_pid_to_str (lp->ptid)); | |
3105 | } | |
3106 | else | |
3107 | { | |
3108 | /* This is a delayed SIGSTOP. Filter out the event. */ | |
02f3fc28 | 3109 | |
25289eb2 PA |
3110 | if (debug_linux_nat) |
3111 | fprintf_unfiltered (gdb_stdlog, | |
2bf6fb9d | 3112 | "LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", |
25289eb2 PA |
3113 | lp->step ? |
3114 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3115 | target_pid_to_str (lp->ptid)); | |
02f3fc28 | 3116 | |
2bf6fb9d | 3117 | linux_resume_one_lwp (lp, lp->step, GDB_SIGNAL_0); |
25289eb2 | 3118 | gdb_assert (lp->resumed); |
25289eb2 PA |
3119 | return NULL; |
3120 | } | |
02f3fc28 PA |
3121 | } |
3122 | ||
57380f4e DJ |
3123 | /* Make sure we don't report a SIGINT that we have already displayed |
3124 | for another thread. */ | |
3125 | if (lp->ignore_sigint | |
3126 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
3127 | { | |
3128 | if (debug_linux_nat) | |
3129 | fprintf_unfiltered (gdb_stdlog, | |
3130 | "LLW: Delayed SIGINT caught for %s.\n", | |
3131 | target_pid_to_str (lp->ptid)); | |
3132 | ||
3133 | /* This is a delayed SIGINT. */ | |
3134 | lp->ignore_sigint = 0; | |
3135 | ||
8a99810d | 3136 | linux_resume_one_lwp (lp, lp->step, GDB_SIGNAL_0); |
57380f4e DJ |
3137 | if (debug_linux_nat) |
3138 | fprintf_unfiltered (gdb_stdlog, | |
3139 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
3140 | lp->step ? | |
3141 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3142 | target_pid_to_str (lp->ptid)); | |
57380f4e DJ |
3143 | gdb_assert (lp->resumed); |
3144 | ||
3145 | /* Discard the event. */ | |
3146 | return NULL; | |
3147 | } | |
3148 | ||
9c02b525 PA |
3149 | /* Don't report signals that GDB isn't interested in, such as |
3150 | signals that are neither printed nor stopped upon. Stopping all | |
3151 | threads can be a bit time-consuming so if we want decent | |
3152 | performance with heavily multi-threaded programs, especially when | |
3153 | they're using a high frequency timer, we'd better avoid it if we | |
3154 | can. */ | |
3155 | if (WIFSTOPPED (status)) | |
3156 | { | |
3157 | enum gdb_signal signo = gdb_signal_from_host (WSTOPSIG (status)); | |
3158 | ||
fbea99ea | 3159 | if (!target_is_non_stop_p ()) |
9c02b525 PA |
3160 | { |
3161 | /* Only do the below in all-stop, as we currently use SIGSTOP | |
3162 | to implement target_stop (see linux_nat_stop) in | |
3163 | non-stop. */ | |
3164 | if (signo == GDB_SIGNAL_INT && signal_pass_state (signo) == 0) | |
3165 | { | |
3166 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
3167 | forwarded to the entire process group, that is, all LWPs | |
3168 | will receive it - unless they're using CLONE_THREAD to | |
3169 | share signals. Since we only want to report it once, we | |
3170 | mark it as ignored for all LWPs except this one. */ | |
3171 | iterate_over_lwps (pid_to_ptid (ptid_get_pid (lp->ptid)), | |
3172 | set_ignore_sigint, NULL); | |
3173 | lp->ignore_sigint = 0; | |
3174 | } | |
3175 | else | |
3176 | maybe_clear_ignore_sigint (lp); | |
3177 | } | |
3178 | ||
3179 | /* When using hardware single-step, we need to report every signal. | |
c9587f88 AT |
3180 | Otherwise, signals in pass_mask may be short-circuited |
3181 | except signals that might be caused by a breakpoint. */ | |
9c02b525 | 3182 | if (!lp->step |
c9587f88 AT |
3183 | && WSTOPSIG (status) && sigismember (&pass_mask, WSTOPSIG (status)) |
3184 | && !linux_wstatus_maybe_breakpoint (status)) | |
9c02b525 PA |
3185 | { |
3186 | linux_resume_one_lwp (lp, lp->step, signo); | |
3187 | if (debug_linux_nat) | |
3188 | fprintf_unfiltered (gdb_stdlog, | |
3189 | "LLW: %s %s, %s (preempt 'handle')\n", | |
3190 | lp->step ? | |
3191 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3192 | target_pid_to_str (lp->ptid), | |
3193 | (signo != GDB_SIGNAL_0 | |
3194 | ? strsignal (gdb_signal_to_host (signo)) | |
3195 | : "0")); | |
3196 | return NULL; | |
3197 | } | |
3198 | } | |
3199 | ||
02f3fc28 PA |
3200 | /* An interesting event. */ |
3201 | gdb_assert (lp); | |
ca2163eb | 3202 | lp->status = status; |
e7ad2f14 | 3203 | save_stop_reason (lp); |
02f3fc28 PA |
3204 | return lp; |
3205 | } | |
3206 | ||
0e5bf2a8 PA |
3207 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
3208 | their exits until all other threads in the group have exited. */ | |
3209 | ||
3210 | static void | |
3211 | check_zombie_leaders (void) | |
3212 | { | |
3213 | struct inferior *inf; | |
3214 | ||
3215 | ALL_INFERIORS (inf) | |
3216 | { | |
3217 | struct lwp_info *leader_lp; | |
3218 | ||
3219 | if (inf->pid == 0) | |
3220 | continue; | |
3221 | ||
3222 | leader_lp = find_lwp_pid (pid_to_ptid (inf->pid)); | |
3223 | if (leader_lp != NULL | |
3224 | /* Check if there are other threads in the group, as we may | |
3225 | have raced with the inferior simply exiting. */ | |
3226 | && num_lwps (inf->pid) > 1 | |
5f572dec | 3227 | && linux_proc_pid_is_zombie (inf->pid)) |
0e5bf2a8 PA |
3228 | { |
3229 | if (debug_linux_nat) | |
3230 | fprintf_unfiltered (gdb_stdlog, | |
3231 | "CZL: Thread group leader %d zombie " | |
3232 | "(it exited, or another thread execd).\n", | |
3233 | inf->pid); | |
3234 | ||
3235 | /* A leader zombie can mean one of two things: | |
3236 | ||
3237 | - It exited, and there's an exit status pending | |
3238 | available, or only the leader exited (not the whole | |
3239 | program). In the latter case, we can't waitpid the | |
3240 | leader's exit status until all other threads are gone. | |
3241 | ||
3242 | - There are 3 or more threads in the group, and a thread | |
4a6ed09b PA |
3243 | other than the leader exec'd. See comments on exec |
3244 | events at the top of the file. We could try | |
0e5bf2a8 PA |
3245 | distinguishing the exit and exec cases, by waiting once |
3246 | more, and seeing if something comes out, but it doesn't | |
3247 | sound useful. The previous leader _does_ go away, and | |
3248 | we'll re-add the new one once we see the exec event | |
3249 | (which is just the same as what would happen if the | |
3250 | previous leader did exit voluntarily before some other | |
3251 | thread execs). */ | |
3252 | ||
3253 | if (debug_linux_nat) | |
3254 | fprintf_unfiltered (gdb_stdlog, | |
3255 | "CZL: Thread group leader %d vanished.\n", | |
3256 | inf->pid); | |
3257 | exit_lwp (leader_lp); | |
3258 | } | |
3259 | } | |
3260 | } | |
3261 | ||
aa01bd36 PA |
3262 | /* Convenience function that is called when the kernel reports an exit |
3263 | event. This decides whether to report the event to GDB as a | |
3264 | process exit event, a thread exit event, or to suppress the | |
3265 | event. */ | |
3266 | ||
3267 | static ptid_t | |
3268 | filter_exit_event (struct lwp_info *event_child, | |
3269 | struct target_waitstatus *ourstatus) | |
3270 | { | |
3271 | ptid_t ptid = event_child->ptid; | |
3272 | ||
3273 | if (num_lwps (ptid_get_pid (ptid)) > 1) | |
3274 | { | |
3275 | if (report_thread_events) | |
3276 | ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED; | |
3277 | else | |
3278 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3279 | ||
3280 | exit_lwp (event_child); | |
3281 | } | |
3282 | ||
3283 | return ptid; | |
3284 | } | |
3285 | ||
d6b0e80f | 3286 | static ptid_t |
7feb7d06 | 3287 | linux_nat_wait_1 (struct target_ops *ops, |
47608cb1 PA |
3288 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3289 | int target_options) | |
d6b0e80f | 3290 | { |
fc9b8e47 | 3291 | sigset_t prev_mask; |
4b60df3d | 3292 | enum resume_kind last_resume_kind; |
12d9289a | 3293 | struct lwp_info *lp; |
12d9289a | 3294 | int status; |
d6b0e80f | 3295 | |
01124a23 | 3296 | if (debug_linux_nat) |
b84876c2 PA |
3297 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); |
3298 | ||
f973ed9c DJ |
3299 | /* The first time we get here after starting a new inferior, we may |
3300 | not have added it to the LWP list yet - this is the earliest | |
3301 | moment at which we know its PID. */ | |
d90e17a7 | 3302 | if (ptid_is_pid (inferior_ptid)) |
f973ed9c | 3303 | { |
27c9d204 PA |
3304 | /* Upgrade the main thread's ptid. */ |
3305 | thread_change_ptid (inferior_ptid, | |
dfd4cc63 LM |
3306 | ptid_build (ptid_get_pid (inferior_ptid), |
3307 | ptid_get_pid (inferior_ptid), 0)); | |
27c9d204 | 3308 | |
26cb8b7c | 3309 | lp = add_initial_lwp (inferior_ptid); |
f973ed9c DJ |
3310 | lp->resumed = 1; |
3311 | } | |
3312 | ||
12696c10 | 3313 | /* Make sure SIGCHLD is blocked until the sigsuspend below. */ |
7feb7d06 | 3314 | block_child_signals (&prev_mask); |
d6b0e80f | 3315 | |
d6b0e80f | 3316 | /* First check if there is a LWP with a wait status pending. */ |
8a99810d PA |
3317 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
3318 | if (lp != NULL) | |
d6b0e80f AC |
3319 | { |
3320 | if (debug_linux_nat) | |
d6b0e80f AC |
3321 | fprintf_unfiltered (gdb_stdlog, |
3322 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3323 | status_to_str (lp->status), |
d6b0e80f | 3324 | target_pid_to_str (lp->ptid)); |
d6b0e80f AC |
3325 | } |
3326 | ||
9c02b525 PA |
3327 | /* But if we don't find a pending event, we'll have to wait. Always |
3328 | pull all events out of the kernel. We'll randomly select an | |
3329 | event LWP out of all that have events, to prevent starvation. */ | |
7feb7d06 | 3330 | |
d90e17a7 | 3331 | while (lp == NULL) |
d6b0e80f AC |
3332 | { |
3333 | pid_t lwpid; | |
3334 | ||
0e5bf2a8 PA |
3335 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
3336 | quirks: | |
3337 | ||
3338 | - If the thread group leader exits while other threads in the | |
3339 | thread group still exist, waitpid(TGID, ...) hangs. That | |
3340 | waitpid won't return an exit status until the other threads | |
3341 | in the group are reapped. | |
3342 | ||
3343 | - When a non-leader thread execs, that thread just vanishes | |
3344 | without reporting an exit (so we'd hang if we waited for it | |
3345 | explicitly in that case). The exec event is reported to | |
3346 | the TGID pid. */ | |
3347 | ||
3348 | errno = 0; | |
4a6ed09b | 3349 | lwpid = my_waitpid (-1, &status, __WALL | WNOHANG); |
0e5bf2a8 PA |
3350 | |
3351 | if (debug_linux_nat) | |
3352 | fprintf_unfiltered (gdb_stdlog, | |
3353 | "LNW: waitpid(-1, ...) returned %d, %s\n", | |
3354 | lwpid, errno ? safe_strerror (errno) : "ERRNO-OK"); | |
b84876c2 | 3355 | |
d6b0e80f AC |
3356 | if (lwpid > 0) |
3357 | { | |
d6b0e80f AC |
3358 | if (debug_linux_nat) |
3359 | { | |
3360 | fprintf_unfiltered (gdb_stdlog, | |
3361 | "LLW: waitpid %ld received %s\n", | |
3362 | (long) lwpid, status_to_str (status)); | |
3363 | } | |
3364 | ||
9c02b525 | 3365 | linux_nat_filter_event (lwpid, status); |
0e5bf2a8 PA |
3366 | /* Retry until nothing comes out of waitpid. A single |
3367 | SIGCHLD can indicate more than one child stopped. */ | |
3368 | continue; | |
d6b0e80f AC |
3369 | } |
3370 | ||
20ba1ce6 PA |
3371 | /* Now that we've pulled all events out of the kernel, resume |
3372 | LWPs that don't have an interesting event to report. */ | |
3373 | iterate_over_lwps (minus_one_ptid, | |
3374 | resume_stopped_resumed_lwps, &minus_one_ptid); | |
3375 | ||
3376 | /* ... and find an LWP with a status to report to the core, if | |
3377 | any. */ | |
9c02b525 PA |
3378 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
3379 | if (lp != NULL) | |
3380 | break; | |
3381 | ||
0e5bf2a8 PA |
3382 | /* Check for zombie thread group leaders. Those can't be reaped |
3383 | until all other threads in the thread group are. */ | |
3384 | check_zombie_leaders (); | |
d6b0e80f | 3385 | |
0e5bf2a8 PA |
3386 | /* If there are no resumed children left, bail. We'd be stuck |
3387 | forever in the sigsuspend call below otherwise. */ | |
3388 | if (iterate_over_lwps (ptid, resumed_callback, NULL) == NULL) | |
3389 | { | |
3390 | if (debug_linux_nat) | |
3391 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (no resumed LWP)\n"); | |
b84876c2 | 3392 | |
0e5bf2a8 | 3393 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
b84876c2 | 3394 | |
0e5bf2a8 PA |
3395 | restore_child_signals_mask (&prev_mask); |
3396 | return minus_one_ptid; | |
d6b0e80f | 3397 | } |
28736962 | 3398 | |
0e5bf2a8 PA |
3399 | /* No interesting event to report to the core. */ |
3400 | ||
3401 | if (target_options & TARGET_WNOHANG) | |
3402 | { | |
01124a23 | 3403 | if (debug_linux_nat) |
28736962 PA |
3404 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); |
3405 | ||
0e5bf2a8 | 3406 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
28736962 PA |
3407 | restore_child_signals_mask (&prev_mask); |
3408 | return minus_one_ptid; | |
3409 | } | |
d6b0e80f AC |
3410 | |
3411 | /* We shouldn't end up here unless we want to try again. */ | |
d90e17a7 | 3412 | gdb_assert (lp == NULL); |
0e5bf2a8 PA |
3413 | |
3414 | /* Block until we get an event reported with SIGCHLD. */ | |
d36bf488 DE |
3415 | if (debug_linux_nat) |
3416 | fprintf_unfiltered (gdb_stdlog, "LNW: about to sigsuspend\n"); | |
0e5bf2a8 | 3417 | sigsuspend (&suspend_mask); |
d6b0e80f AC |
3418 | } |
3419 | ||
d6b0e80f AC |
3420 | gdb_assert (lp); |
3421 | ||
ca2163eb PA |
3422 | status = lp->status; |
3423 | lp->status = 0; | |
3424 | ||
fbea99ea | 3425 | if (!target_is_non_stop_p ()) |
4c28f408 PA |
3426 | { |
3427 | /* Now stop all other LWP's ... */ | |
d90e17a7 | 3428 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); |
4c28f408 PA |
3429 | |
3430 | /* ... and wait until all of them have reported back that | |
3431 | they're no longer running. */ | |
d90e17a7 | 3432 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); |
9c02b525 PA |
3433 | } |
3434 | ||
3435 | /* If we're not waiting for a specific LWP, choose an event LWP from | |
3436 | among those that have had events. Giving equal priority to all | |
3437 | LWPs that have had events helps prevent starvation. */ | |
3438 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) | |
3439 | select_event_lwp (ptid, &lp, &status); | |
3440 | ||
3441 | gdb_assert (lp != NULL); | |
3442 | ||
3443 | /* Now that we've selected our final event LWP, un-adjust its PC if | |
faf09f01 PA |
3444 | it was a software breakpoint, and we can't reliably support the |
3445 | "stopped by software breakpoint" stop reason. */ | |
3446 | if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3447 | && !USE_SIGTRAP_SIGINFO) | |
9c02b525 PA |
3448 | { |
3449 | struct regcache *regcache = get_thread_regcache (lp->ptid); | |
3450 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
527a273a | 3451 | int decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
4c28f408 | 3452 | |
9c02b525 PA |
3453 | if (decr_pc != 0) |
3454 | { | |
3455 | CORE_ADDR pc; | |
d6b0e80f | 3456 | |
9c02b525 PA |
3457 | pc = regcache_read_pc (regcache); |
3458 | regcache_write_pc (regcache, pc + decr_pc); | |
3459 | } | |
3460 | } | |
e3e9f5a2 | 3461 | |
9c02b525 PA |
3462 | /* We'll need this to determine whether to report a SIGSTOP as |
3463 | GDB_SIGNAL_0. Need to take a copy because resume_clear_callback | |
3464 | clears it. */ | |
3465 | last_resume_kind = lp->last_resume_kind; | |
4b60df3d | 3466 | |
fbea99ea | 3467 | if (!target_is_non_stop_p ()) |
9c02b525 | 3468 | { |
e3e9f5a2 PA |
3469 | /* In all-stop, from the core's perspective, all LWPs are now |
3470 | stopped until a new resume action is sent over. */ | |
3471 | iterate_over_lwps (minus_one_ptid, resume_clear_callback, NULL); | |
3472 | } | |
3473 | else | |
25289eb2 | 3474 | { |
4b60df3d | 3475 | resume_clear_callback (lp, NULL); |
25289eb2 | 3476 | } |
d6b0e80f | 3477 | |
26ab7092 | 3478 | if (linux_nat_status_is_event (status)) |
d6b0e80f | 3479 | { |
d6b0e80f AC |
3480 | if (debug_linux_nat) |
3481 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
3482 | "LLW: trap ptid is %s.\n", |
3483 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 3484 | } |
d6b0e80f AC |
3485 | |
3486 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
3487 | { | |
3488 | *ourstatus = lp->waitstatus; | |
3489 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3490 | } | |
3491 | else | |
3492 | store_waitstatus (ourstatus, status); | |
3493 | ||
01124a23 | 3494 | if (debug_linux_nat) |
b84876c2 PA |
3495 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); |
3496 | ||
7feb7d06 | 3497 | restore_child_signals_mask (&prev_mask); |
1e225492 | 3498 | |
4b60df3d | 3499 | if (last_resume_kind == resume_stop |
25289eb2 PA |
3500 | && ourstatus->kind == TARGET_WAITKIND_STOPPED |
3501 | && WSTOPSIG (status) == SIGSTOP) | |
3502 | { | |
3503 | /* A thread that has been requested to stop by GDB with | |
3504 | target_stop, and it stopped cleanly, so report as SIG0. The | |
3505 | use of SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3506 | ourstatus->value.sig = GDB_SIGNAL_0; |
25289eb2 PA |
3507 | } |
3508 | ||
1e225492 JK |
3509 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
3510 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) | |
3511 | lp->core = -1; | |
3512 | else | |
2e794194 | 3513 | lp->core = linux_common_core_of_thread (lp->ptid); |
1e225492 | 3514 | |
aa01bd36 PA |
3515 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3516 | return filter_exit_event (lp, ourstatus); | |
3517 | ||
f973ed9c | 3518 | return lp->ptid; |
d6b0e80f AC |
3519 | } |
3520 | ||
e3e9f5a2 PA |
3521 | /* Resume LWPs that are currently stopped without any pending status |
3522 | to report, but are resumed from the core's perspective. */ | |
3523 | ||
3524 | static int | |
3525 | resume_stopped_resumed_lwps (struct lwp_info *lp, void *data) | |
3526 | { | |
9a3c8263 | 3527 | ptid_t *wait_ptid_p = (ptid_t *) data; |
e3e9f5a2 | 3528 | |
4dd63d48 PA |
3529 | if (!lp->stopped) |
3530 | { | |
3531 | if (debug_linux_nat) | |
3532 | fprintf_unfiltered (gdb_stdlog, | |
3533 | "RSRL: NOT resuming LWP %s, not stopped\n", | |
3534 | target_pid_to_str (lp->ptid)); | |
3535 | } | |
3536 | else if (!lp->resumed) | |
3537 | { | |
3538 | if (debug_linux_nat) | |
3539 | fprintf_unfiltered (gdb_stdlog, | |
3540 | "RSRL: NOT resuming LWP %s, not resumed\n", | |
3541 | target_pid_to_str (lp->ptid)); | |
3542 | } | |
3543 | else if (lwp_status_pending_p (lp)) | |
3544 | { | |
3545 | if (debug_linux_nat) | |
3546 | fprintf_unfiltered (gdb_stdlog, | |
3547 | "RSRL: NOT resuming LWP %s, has pending status\n", | |
3548 | target_pid_to_str (lp->ptid)); | |
3549 | } | |
3550 | else | |
e3e9f5a2 | 3551 | { |
336060f3 PA |
3552 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
3553 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
336060f3 | 3554 | |
23f238d3 | 3555 | TRY |
e3e9f5a2 | 3556 | { |
23f238d3 PA |
3557 | CORE_ADDR pc = regcache_read_pc (regcache); |
3558 | int leave_stopped = 0; | |
e3e9f5a2 | 3559 | |
23f238d3 PA |
3560 | /* Don't bother if there's a breakpoint at PC that we'd hit |
3561 | immediately, and we're not waiting for this LWP. */ | |
3562 | if (!ptid_match (lp->ptid, *wait_ptid_p)) | |
3563 | { | |
3564 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
3565 | leave_stopped = 1; | |
3566 | } | |
e3e9f5a2 | 3567 | |
23f238d3 PA |
3568 | if (!leave_stopped) |
3569 | { | |
3570 | if (debug_linux_nat) | |
3571 | fprintf_unfiltered (gdb_stdlog, | |
3572 | "RSRL: resuming stopped-resumed LWP %s at " | |
3573 | "%s: step=%d\n", | |
3574 | target_pid_to_str (lp->ptid), | |
3575 | paddress (gdbarch, pc), | |
3576 | lp->step); | |
3577 | ||
3578 | linux_resume_one_lwp_throw (lp, lp->step, GDB_SIGNAL_0); | |
3579 | } | |
3580 | } | |
3581 | CATCH (ex, RETURN_MASK_ERROR) | |
3582 | { | |
3583 | if (!check_ptrace_stopped_lwp_gone (lp)) | |
3584 | throw_exception (ex); | |
3585 | } | |
3586 | END_CATCH | |
e3e9f5a2 PA |
3587 | } |
3588 | ||
3589 | return 0; | |
3590 | } | |
3591 | ||
7feb7d06 PA |
3592 | static ptid_t |
3593 | linux_nat_wait (struct target_ops *ops, | |
47608cb1 PA |
3594 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3595 | int target_options) | |
7feb7d06 PA |
3596 | { |
3597 | ptid_t event_ptid; | |
3598 | ||
3599 | if (debug_linux_nat) | |
09826ec5 PA |
3600 | { |
3601 | char *options_string; | |
3602 | ||
3603 | options_string = target_options_to_string (target_options); | |
3604 | fprintf_unfiltered (gdb_stdlog, | |
3605 | "linux_nat_wait: [%s], [%s]\n", | |
3606 | target_pid_to_str (ptid), | |
3607 | options_string); | |
3608 | xfree (options_string); | |
3609 | } | |
7feb7d06 PA |
3610 | |
3611 | /* Flush the async file first. */ | |
d9d41e78 | 3612 | if (target_is_async_p ()) |
7feb7d06 PA |
3613 | async_file_flush (); |
3614 | ||
e3e9f5a2 PA |
3615 | /* Resume LWPs that are currently stopped without any pending status |
3616 | to report, but are resumed from the core's perspective. LWPs get | |
3617 | in this state if we find them stopping at a time we're not | |
3618 | interested in reporting the event (target_wait on a | |
3619 | specific_process, for example, see linux_nat_wait_1), and | |
3620 | meanwhile the event became uninteresting. Don't bother resuming | |
3621 | LWPs we're not going to wait for if they'd stop immediately. */ | |
fbea99ea | 3622 | if (target_is_non_stop_p ()) |
e3e9f5a2 PA |
3623 | iterate_over_lwps (minus_one_ptid, resume_stopped_resumed_lwps, &ptid); |
3624 | ||
47608cb1 | 3625 | event_ptid = linux_nat_wait_1 (ops, ptid, ourstatus, target_options); |
7feb7d06 PA |
3626 | |
3627 | /* If we requested any event, and something came out, assume there | |
3628 | may be more. If we requested a specific lwp or process, also | |
3629 | assume there may be more. */ | |
d9d41e78 | 3630 | if (target_is_async_p () |
6953d224 PA |
3631 | && ((ourstatus->kind != TARGET_WAITKIND_IGNORE |
3632 | && ourstatus->kind != TARGET_WAITKIND_NO_RESUMED) | |
7feb7d06 PA |
3633 | || !ptid_equal (ptid, minus_one_ptid))) |
3634 | async_file_mark (); | |
3635 | ||
7feb7d06 PA |
3636 | return event_ptid; |
3637 | } | |
3638 | ||
1d2736d4 PA |
3639 | /* Kill one LWP. */ |
3640 | ||
3641 | static void | |
3642 | kill_one_lwp (pid_t pid) | |
d6b0e80f | 3643 | { |
ed731959 JK |
3644 | /* PTRACE_KILL may resume the inferior. Send SIGKILL first. */ |
3645 | ||
3646 | errno = 0; | |
1d2736d4 | 3647 | kill_lwp (pid, SIGKILL); |
ed731959 | 3648 | if (debug_linux_nat) |
57745c90 PA |
3649 | { |
3650 | int save_errno = errno; | |
3651 | ||
3652 | fprintf_unfiltered (gdb_stdlog, | |
1d2736d4 | 3653 | "KC: kill (SIGKILL) %ld, 0, 0 (%s)\n", (long) pid, |
57745c90 PA |
3654 | save_errno ? safe_strerror (save_errno) : "OK"); |
3655 | } | |
ed731959 JK |
3656 | |
3657 | /* Some kernels ignore even SIGKILL for processes under ptrace. */ | |
3658 | ||
d6b0e80f | 3659 | errno = 0; |
1d2736d4 | 3660 | ptrace (PTRACE_KILL, pid, 0, 0); |
d6b0e80f | 3661 | if (debug_linux_nat) |
57745c90 PA |
3662 | { |
3663 | int save_errno = errno; | |
3664 | ||
3665 | fprintf_unfiltered (gdb_stdlog, | |
1d2736d4 | 3666 | "KC: PTRACE_KILL %ld, 0, 0 (%s)\n", (long) pid, |
57745c90 PA |
3667 | save_errno ? safe_strerror (save_errno) : "OK"); |
3668 | } | |
d6b0e80f AC |
3669 | } |
3670 | ||
1d2736d4 PA |
3671 | /* Wait for an LWP to die. */ |
3672 | ||
3673 | static void | |
3674 | kill_wait_one_lwp (pid_t pid) | |
d6b0e80f | 3675 | { |
1d2736d4 | 3676 | pid_t res; |
d6b0e80f AC |
3677 | |
3678 | /* We must make sure that there are no pending events (delayed | |
3679 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
3680 | program doesn't interfere with any following debugging session. */ | |
3681 | ||
d6b0e80f AC |
3682 | do |
3683 | { | |
1d2736d4 PA |
3684 | res = my_waitpid (pid, NULL, __WALL); |
3685 | if (res != (pid_t) -1) | |
d6b0e80f | 3686 | { |
e85a822c DJ |
3687 | if (debug_linux_nat) |
3688 | fprintf_unfiltered (gdb_stdlog, | |
1d2736d4 PA |
3689 | "KWC: wait %ld received unknown.\n", |
3690 | (long) pid); | |
4a6ed09b PA |
3691 | /* The Linux kernel sometimes fails to kill a thread |
3692 | completely after PTRACE_KILL; that goes from the stop | |
3693 | point in do_fork out to the one in get_signal_to_deliver | |
3694 | and waits again. So kill it again. */ | |
1d2736d4 | 3695 | kill_one_lwp (pid); |
d6b0e80f AC |
3696 | } |
3697 | } | |
1d2736d4 PA |
3698 | while (res == pid); |
3699 | ||
3700 | gdb_assert (res == -1 && errno == ECHILD); | |
3701 | } | |
3702 | ||
3703 | /* Callback for iterate_over_lwps. */ | |
d6b0e80f | 3704 | |
1d2736d4 PA |
3705 | static int |
3706 | kill_callback (struct lwp_info *lp, void *data) | |
3707 | { | |
3708 | kill_one_lwp (ptid_get_lwp (lp->ptid)); | |
d6b0e80f AC |
3709 | return 0; |
3710 | } | |
3711 | ||
1d2736d4 PA |
3712 | /* Callback for iterate_over_lwps. */ |
3713 | ||
3714 | static int | |
3715 | kill_wait_callback (struct lwp_info *lp, void *data) | |
3716 | { | |
3717 | kill_wait_one_lwp (ptid_get_lwp (lp->ptid)); | |
3718 | return 0; | |
3719 | } | |
3720 | ||
3721 | /* Kill the fork children of any threads of inferior INF that are | |
3722 | stopped at a fork event. */ | |
3723 | ||
3724 | static void | |
3725 | kill_unfollowed_fork_children (struct inferior *inf) | |
3726 | { | |
3727 | struct thread_info *thread; | |
3728 | ||
3729 | ALL_NON_EXITED_THREADS (thread) | |
3730 | if (thread->inf == inf) | |
3731 | { | |
3732 | struct target_waitstatus *ws = &thread->pending_follow; | |
3733 | ||
3734 | if (ws->kind == TARGET_WAITKIND_FORKED | |
3735 | || ws->kind == TARGET_WAITKIND_VFORKED) | |
3736 | { | |
3737 | ptid_t child_ptid = ws->value.related_pid; | |
3738 | int child_pid = ptid_get_pid (child_ptid); | |
3739 | int child_lwp = ptid_get_lwp (child_ptid); | |
1d2736d4 PA |
3740 | |
3741 | kill_one_lwp (child_lwp); | |
3742 | kill_wait_one_lwp (child_lwp); | |
3743 | ||
3744 | /* Let the arch-specific native code know this process is | |
3745 | gone. */ | |
3746 | linux_nat_forget_process (child_pid); | |
3747 | } | |
3748 | } | |
3749 | } | |
3750 | ||
d6b0e80f | 3751 | static void |
7d85a9c0 | 3752 | linux_nat_kill (struct target_ops *ops) |
d6b0e80f | 3753 | { |
f973ed9c DJ |
3754 | /* If we're stopped while forking and we haven't followed yet, |
3755 | kill the other task. We need to do this first because the | |
3756 | parent will be sleeping if this is a vfork. */ | |
1d2736d4 | 3757 | kill_unfollowed_fork_children (current_inferior ()); |
f973ed9c DJ |
3758 | |
3759 | if (forks_exist_p ()) | |
7feb7d06 | 3760 | linux_fork_killall (); |
f973ed9c DJ |
3761 | else |
3762 | { | |
d90e17a7 | 3763 | ptid_t ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
e0881a8e | 3764 | |
4c28f408 PA |
3765 | /* Stop all threads before killing them, since ptrace requires |
3766 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
d90e17a7 | 3767 | iterate_over_lwps (ptid, stop_callback, NULL); |
4c28f408 PA |
3768 | /* ... and wait until all of them have reported back that |
3769 | they're no longer running. */ | |
d90e17a7 | 3770 | iterate_over_lwps (ptid, stop_wait_callback, NULL); |
4c28f408 | 3771 | |
f973ed9c | 3772 | /* Kill all LWP's ... */ |
d90e17a7 | 3773 | iterate_over_lwps (ptid, kill_callback, NULL); |
f973ed9c DJ |
3774 | |
3775 | /* ... and wait until we've flushed all events. */ | |
d90e17a7 | 3776 | iterate_over_lwps (ptid, kill_wait_callback, NULL); |
f973ed9c DJ |
3777 | } |
3778 | ||
3779 | target_mourn_inferior (); | |
d6b0e80f AC |
3780 | } |
3781 | ||
3782 | static void | |
136d6dae | 3783 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 3784 | { |
26cb8b7c PA |
3785 | int pid = ptid_get_pid (inferior_ptid); |
3786 | ||
3787 | purge_lwp_list (pid); | |
d6b0e80f | 3788 | |
f973ed9c | 3789 | if (! forks_exist_p ()) |
d90e17a7 PA |
3790 | /* Normal case, no other forks available. */ |
3791 | linux_ops->to_mourn_inferior (ops); | |
f973ed9c DJ |
3792 | else |
3793 | /* Multi-fork case. The current inferior_ptid has exited, but | |
3794 | there are other viable forks to debug. Delete the exiting | |
3795 | one and context-switch to the first available. */ | |
3796 | linux_fork_mourn_inferior (); | |
26cb8b7c PA |
3797 | |
3798 | /* Let the arch-specific native code know this process is gone. */ | |
3799 | linux_nat_forget_process (pid); | |
d6b0e80f AC |
3800 | } |
3801 | ||
5b009018 PA |
3802 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3803 | layout of the inferiors' architecture. */ | |
3804 | ||
3805 | static void | |
a5362b9a | 3806 | siginfo_fixup (siginfo_t *siginfo, gdb_byte *inf_siginfo, int direction) |
5b009018 PA |
3807 | { |
3808 | int done = 0; | |
3809 | ||
3810 | if (linux_nat_siginfo_fixup != NULL) | |
3811 | done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction); | |
3812 | ||
3813 | /* If there was no callback, or the callback didn't do anything, | |
3814 | then just do a straight memcpy. */ | |
3815 | if (!done) | |
3816 | { | |
3817 | if (direction == 1) | |
a5362b9a | 3818 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
5b009018 | 3819 | else |
a5362b9a | 3820 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
5b009018 PA |
3821 | } |
3822 | } | |
3823 | ||
9b409511 | 3824 | static enum target_xfer_status |
4aa995e1 PA |
3825 | linux_xfer_siginfo (struct target_ops *ops, enum target_object object, |
3826 | const char *annex, gdb_byte *readbuf, | |
9b409511 YQ |
3827 | const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, |
3828 | ULONGEST *xfered_len) | |
4aa995e1 | 3829 | { |
4aa995e1 | 3830 | int pid; |
a5362b9a TS |
3831 | siginfo_t siginfo; |
3832 | gdb_byte inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 PA |
3833 | |
3834 | gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO); | |
3835 | gdb_assert (readbuf || writebuf); | |
3836 | ||
dfd4cc63 | 3837 | pid = ptid_get_lwp (inferior_ptid); |
4aa995e1 | 3838 | if (pid == 0) |
dfd4cc63 | 3839 | pid = ptid_get_pid (inferior_ptid); |
4aa995e1 PA |
3840 | |
3841 | if (offset > sizeof (siginfo)) | |
2ed4b548 | 3842 | return TARGET_XFER_E_IO; |
4aa995e1 PA |
3843 | |
3844 | errno = 0; | |
3845 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3846 | if (errno != 0) | |
2ed4b548 | 3847 | return TARGET_XFER_E_IO; |
4aa995e1 | 3848 | |
5b009018 PA |
3849 | /* When GDB is built as a 64-bit application, ptrace writes into |
3850 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
3851 | inferior with a 64-bit GDB should look the same as debugging it | |
3852 | with a 32-bit GDB, we need to convert it. GDB core always sees | |
3853 | the converted layout, so any read/write will have to be done | |
3854 | post-conversion. */ | |
3855 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
3856 | ||
4aa995e1 PA |
3857 | if (offset + len > sizeof (siginfo)) |
3858 | len = sizeof (siginfo) - offset; | |
3859 | ||
3860 | if (readbuf != NULL) | |
5b009018 | 3861 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
3862 | else |
3863 | { | |
5b009018 PA |
3864 | memcpy (inf_siginfo + offset, writebuf, len); |
3865 | ||
3866 | /* Convert back to ptrace layout before flushing it out. */ | |
3867 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
3868 | ||
4aa995e1 PA |
3869 | errno = 0; |
3870 | ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3871 | if (errno != 0) | |
2ed4b548 | 3872 | return TARGET_XFER_E_IO; |
4aa995e1 PA |
3873 | } |
3874 | ||
9b409511 YQ |
3875 | *xfered_len = len; |
3876 | return TARGET_XFER_OK; | |
4aa995e1 PA |
3877 | } |
3878 | ||
9b409511 | 3879 | static enum target_xfer_status |
10d6c8cd DJ |
3880 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, |
3881 | const char *annex, gdb_byte *readbuf, | |
3882 | const gdb_byte *writebuf, | |
9b409511 | 3883 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
d6b0e80f | 3884 | { |
4aa995e1 | 3885 | struct cleanup *old_chain; |
9b409511 | 3886 | enum target_xfer_status xfer; |
d6b0e80f | 3887 | |
4aa995e1 PA |
3888 | if (object == TARGET_OBJECT_SIGNAL_INFO) |
3889 | return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf, | |
9b409511 | 3890 | offset, len, xfered_len); |
4aa995e1 | 3891 | |
c35b1492 PA |
3892 | /* The target is connected but no live inferior is selected. Pass |
3893 | this request down to a lower stratum (e.g., the executable | |
3894 | file). */ | |
3895 | if (object == TARGET_OBJECT_MEMORY && ptid_equal (inferior_ptid, null_ptid)) | |
9b409511 | 3896 | return TARGET_XFER_EOF; |
c35b1492 | 3897 | |
4aa995e1 PA |
3898 | old_chain = save_inferior_ptid (); |
3899 | ||
dfd4cc63 LM |
3900 | if (ptid_lwp_p (inferior_ptid)) |
3901 | inferior_ptid = pid_to_ptid (ptid_get_lwp (inferior_ptid)); | |
d6b0e80f | 3902 | |
10d6c8cd | 3903 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
9b409511 | 3904 | offset, len, xfered_len); |
d6b0e80f AC |
3905 | |
3906 | do_cleanups (old_chain); | |
3907 | return xfer; | |
3908 | } | |
3909 | ||
28439f5e PA |
3910 | static int |
3911 | linux_nat_thread_alive (struct target_ops *ops, ptid_t ptid) | |
3912 | { | |
4a6ed09b PA |
3913 | /* As long as a PTID is in lwp list, consider it alive. */ |
3914 | return find_lwp_pid (ptid) != NULL; | |
28439f5e PA |
3915 | } |
3916 | ||
8a06aea7 PA |
3917 | /* Implement the to_update_thread_list target method for this |
3918 | target. */ | |
3919 | ||
3920 | static void | |
3921 | linux_nat_update_thread_list (struct target_ops *ops) | |
3922 | { | |
a6904d5a PA |
3923 | struct lwp_info *lwp; |
3924 | ||
4a6ed09b PA |
3925 | /* We add/delete threads from the list as clone/exit events are |
3926 | processed, so just try deleting exited threads still in the | |
3927 | thread list. */ | |
3928 | delete_exited_threads (); | |
a6904d5a PA |
3929 | |
3930 | /* Update the processor core that each lwp/thread was last seen | |
3931 | running on. */ | |
3932 | ALL_LWPS (lwp) | |
1ad3de98 PA |
3933 | { |
3934 | /* Avoid accessing /proc if the thread hasn't run since we last | |
3935 | time we fetched the thread's core. Accessing /proc becomes | |
3936 | noticeably expensive when we have thousands of LWPs. */ | |
3937 | if (lwp->core == -1) | |
3938 | lwp->core = linux_common_core_of_thread (lwp->ptid); | |
3939 | } | |
8a06aea7 PA |
3940 | } |
3941 | ||
d6b0e80f | 3942 | static char * |
117de6a9 | 3943 | linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid) |
d6b0e80f AC |
3944 | { |
3945 | static char buf[64]; | |
3946 | ||
dfd4cc63 LM |
3947 | if (ptid_lwp_p (ptid) |
3948 | && (ptid_get_pid (ptid) != ptid_get_lwp (ptid) | |
3949 | || num_lwps (ptid_get_pid (ptid)) > 1)) | |
d6b0e80f | 3950 | { |
dfd4cc63 | 3951 | snprintf (buf, sizeof (buf), "LWP %ld", ptid_get_lwp (ptid)); |
d6b0e80f AC |
3952 | return buf; |
3953 | } | |
3954 | ||
3955 | return normal_pid_to_str (ptid); | |
3956 | } | |
3957 | ||
73ede765 | 3958 | static const char * |
503a628d | 3959 | linux_nat_thread_name (struct target_ops *self, struct thread_info *thr) |
4694da01 | 3960 | { |
79efa585 | 3961 | return linux_proc_tid_get_name (thr->ptid); |
4694da01 TT |
3962 | } |
3963 | ||
dba24537 AC |
3964 | /* Accepts an integer PID; Returns a string representing a file that |
3965 | can be opened to get the symbols for the child process. */ | |
3966 | ||
6d8fd2b7 | 3967 | static char * |
8dd27370 | 3968 | linux_child_pid_to_exec_file (struct target_ops *self, int pid) |
dba24537 | 3969 | { |
e0d86d2c | 3970 | return linux_proc_pid_to_exec_file (pid); |
dba24537 AC |
3971 | } |
3972 | ||
10d6c8cd DJ |
3973 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
3974 | filesystem. Because we can use a single read() call for /proc, this | |
3975 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
3976 | but it doesn't support writes. */ | |
3977 | ||
9b409511 | 3978 | static enum target_xfer_status |
10d6c8cd DJ |
3979 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, |
3980 | const char *annex, gdb_byte *readbuf, | |
3981 | const gdb_byte *writebuf, | |
9b409511 | 3982 | ULONGEST offset, LONGEST len, ULONGEST *xfered_len) |
dba24537 | 3983 | { |
10d6c8cd DJ |
3984 | LONGEST ret; |
3985 | int fd; | |
dba24537 AC |
3986 | char filename[64]; |
3987 | ||
10d6c8cd | 3988 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
f486487f | 3989 | return TARGET_XFER_EOF; |
dba24537 AC |
3990 | |
3991 | /* Don't bother for one word. */ | |
3992 | if (len < 3 * sizeof (long)) | |
9b409511 | 3993 | return TARGET_XFER_EOF; |
dba24537 AC |
3994 | |
3995 | /* We could keep this file open and cache it - possibly one per | |
3996 | thread. That requires some juggling, but is even faster. */ | |
cde33bf1 YQ |
3997 | xsnprintf (filename, sizeof filename, "/proc/%d/mem", |
3998 | ptid_get_pid (inferior_ptid)); | |
614c279d | 3999 | fd = gdb_open_cloexec (filename, O_RDONLY | O_LARGEFILE, 0); |
dba24537 | 4000 | if (fd == -1) |
9b409511 | 4001 | return TARGET_XFER_EOF; |
dba24537 AC |
4002 | |
4003 | /* If pread64 is available, use it. It's faster if the kernel | |
4004 | supports it (only one syscall), and it's 64-bit safe even on | |
4005 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4006 | application). */ | |
4007 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 4008 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 4009 | #else |
10d6c8cd | 4010 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
4011 | #endif |
4012 | ret = 0; | |
4013 | else | |
4014 | ret = len; | |
4015 | ||
4016 | close (fd); | |
9b409511 YQ |
4017 | |
4018 | if (ret == 0) | |
4019 | return TARGET_XFER_EOF; | |
4020 | else | |
4021 | { | |
4022 | *xfered_len = ret; | |
4023 | return TARGET_XFER_OK; | |
4024 | } | |
dba24537 AC |
4025 | } |
4026 | ||
efcbbd14 UW |
4027 | |
4028 | /* Enumerate spufs IDs for process PID. */ | |
4029 | static LONGEST | |
b55e14c7 | 4030 | spu_enumerate_spu_ids (int pid, gdb_byte *buf, ULONGEST offset, ULONGEST len) |
efcbbd14 | 4031 | { |
f5656ead | 4032 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
efcbbd14 UW |
4033 | LONGEST pos = 0; |
4034 | LONGEST written = 0; | |
4035 | char path[128]; | |
4036 | DIR *dir; | |
4037 | struct dirent *entry; | |
4038 | ||
4039 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4040 | dir = opendir (path); | |
4041 | if (!dir) | |
4042 | return -1; | |
4043 | ||
4044 | rewinddir (dir); | |
4045 | while ((entry = readdir (dir)) != NULL) | |
4046 | { | |
4047 | struct stat st; | |
4048 | struct statfs stfs; | |
4049 | int fd; | |
4050 | ||
4051 | fd = atoi (entry->d_name); | |
4052 | if (!fd) | |
4053 | continue; | |
4054 | ||
4055 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4056 | if (stat (path, &st) != 0) | |
4057 | continue; | |
4058 | if (!S_ISDIR (st.st_mode)) | |
4059 | continue; | |
4060 | ||
4061 | if (statfs (path, &stfs) != 0) | |
4062 | continue; | |
4063 | if (stfs.f_type != SPUFS_MAGIC) | |
4064 | continue; | |
4065 | ||
4066 | if (pos >= offset && pos + 4 <= offset + len) | |
4067 | { | |
4068 | store_unsigned_integer (buf + pos - offset, 4, byte_order, fd); | |
4069 | written += 4; | |
4070 | } | |
4071 | pos += 4; | |
4072 | } | |
4073 | ||
4074 | closedir (dir); | |
4075 | return written; | |
4076 | } | |
4077 | ||
4078 | /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4079 | object type, using the /proc file system. */ | |
9b409511 YQ |
4080 | |
4081 | static enum target_xfer_status | |
efcbbd14 UW |
4082 | linux_proc_xfer_spu (struct target_ops *ops, enum target_object object, |
4083 | const char *annex, gdb_byte *readbuf, | |
4084 | const gdb_byte *writebuf, | |
9b409511 | 4085 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
efcbbd14 UW |
4086 | { |
4087 | char buf[128]; | |
4088 | int fd = 0; | |
4089 | int ret = -1; | |
dfd4cc63 | 4090 | int pid = ptid_get_pid (inferior_ptid); |
efcbbd14 UW |
4091 | |
4092 | if (!annex) | |
4093 | { | |
4094 | if (!readbuf) | |
2ed4b548 | 4095 | return TARGET_XFER_E_IO; |
efcbbd14 | 4096 | else |
9b409511 YQ |
4097 | { |
4098 | LONGEST l = spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4099 | ||
4100 | if (l < 0) | |
4101 | return TARGET_XFER_E_IO; | |
4102 | else if (l == 0) | |
4103 | return TARGET_XFER_EOF; | |
4104 | else | |
4105 | { | |
4106 | *xfered_len = (ULONGEST) l; | |
4107 | return TARGET_XFER_OK; | |
4108 | } | |
4109 | } | |
efcbbd14 UW |
4110 | } |
4111 | ||
4112 | xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex); | |
614c279d | 4113 | fd = gdb_open_cloexec (buf, writebuf? O_WRONLY : O_RDONLY, 0); |
efcbbd14 | 4114 | if (fd <= 0) |
2ed4b548 | 4115 | return TARGET_XFER_E_IO; |
efcbbd14 UW |
4116 | |
4117 | if (offset != 0 | |
4118 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4119 | { | |
4120 | close (fd); | |
9b409511 | 4121 | return TARGET_XFER_EOF; |
efcbbd14 UW |
4122 | } |
4123 | ||
4124 | if (writebuf) | |
4125 | ret = write (fd, writebuf, (size_t) len); | |
4126 | else if (readbuf) | |
4127 | ret = read (fd, readbuf, (size_t) len); | |
4128 | ||
4129 | close (fd); | |
9b409511 YQ |
4130 | |
4131 | if (ret < 0) | |
4132 | return TARGET_XFER_E_IO; | |
4133 | else if (ret == 0) | |
4134 | return TARGET_XFER_EOF; | |
4135 | else | |
4136 | { | |
4137 | *xfered_len = (ULONGEST) ret; | |
4138 | return TARGET_XFER_OK; | |
4139 | } | |
efcbbd14 UW |
4140 | } |
4141 | ||
4142 | ||
dba24537 AC |
4143 | /* Parse LINE as a signal set and add its set bits to SIGS. */ |
4144 | ||
4145 | static void | |
4146 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
4147 | { | |
4148 | int len = strlen (line) - 1; | |
4149 | const char *p; | |
4150 | int signum; | |
4151 | ||
4152 | if (line[len] != '\n') | |
8a3fe4f8 | 4153 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4154 | |
4155 | p = line; | |
4156 | signum = len * 4; | |
4157 | while (len-- > 0) | |
4158 | { | |
4159 | int digit; | |
4160 | ||
4161 | if (*p >= '0' && *p <= '9') | |
4162 | digit = *p - '0'; | |
4163 | else if (*p >= 'a' && *p <= 'f') | |
4164 | digit = *p - 'a' + 10; | |
4165 | else | |
8a3fe4f8 | 4166 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4167 | |
4168 | signum -= 4; | |
4169 | ||
4170 | if (digit & 1) | |
4171 | sigaddset (sigs, signum + 1); | |
4172 | if (digit & 2) | |
4173 | sigaddset (sigs, signum + 2); | |
4174 | if (digit & 4) | |
4175 | sigaddset (sigs, signum + 3); | |
4176 | if (digit & 8) | |
4177 | sigaddset (sigs, signum + 4); | |
4178 | ||
4179 | p++; | |
4180 | } | |
4181 | } | |
4182 | ||
4183 | /* Find process PID's pending signals from /proc/pid/status and set | |
4184 | SIGS to match. */ | |
4185 | ||
4186 | void | |
3e43a32a MS |
4187 | linux_proc_pending_signals (int pid, sigset_t *pending, |
4188 | sigset_t *blocked, sigset_t *ignored) | |
dba24537 AC |
4189 | { |
4190 | FILE *procfile; | |
d8d2a3ee | 4191 | char buffer[PATH_MAX], fname[PATH_MAX]; |
7c8a8b04 | 4192 | struct cleanup *cleanup; |
dba24537 AC |
4193 | |
4194 | sigemptyset (pending); | |
4195 | sigemptyset (blocked); | |
4196 | sigemptyset (ignored); | |
cde33bf1 | 4197 | xsnprintf (fname, sizeof fname, "/proc/%d/status", pid); |
614c279d | 4198 | procfile = gdb_fopen_cloexec (fname, "r"); |
dba24537 | 4199 | if (procfile == NULL) |
8a3fe4f8 | 4200 | error (_("Could not open %s"), fname); |
7c8a8b04 | 4201 | cleanup = make_cleanup_fclose (procfile); |
dba24537 | 4202 | |
d8d2a3ee | 4203 | while (fgets (buffer, PATH_MAX, procfile) != NULL) |
dba24537 AC |
4204 | { |
4205 | /* Normal queued signals are on the SigPnd line in the status | |
4206 | file. However, 2.6 kernels also have a "shared" pending | |
4207 | queue for delivering signals to a thread group, so check for | |
4208 | a ShdPnd line also. | |
4209 | ||
4210 | Unfortunately some Red Hat kernels include the shared pending | |
4211 | queue but not the ShdPnd status field. */ | |
4212 | ||
61012eef | 4213 | if (startswith (buffer, "SigPnd:\t")) |
dba24537 | 4214 | add_line_to_sigset (buffer + 8, pending); |
61012eef | 4215 | else if (startswith (buffer, "ShdPnd:\t")) |
dba24537 | 4216 | add_line_to_sigset (buffer + 8, pending); |
61012eef | 4217 | else if (startswith (buffer, "SigBlk:\t")) |
dba24537 | 4218 | add_line_to_sigset (buffer + 8, blocked); |
61012eef | 4219 | else if (startswith (buffer, "SigIgn:\t")) |
dba24537 AC |
4220 | add_line_to_sigset (buffer + 8, ignored); |
4221 | } | |
4222 | ||
7c8a8b04 | 4223 | do_cleanups (cleanup); |
dba24537 AC |
4224 | } |
4225 | ||
9b409511 | 4226 | static enum target_xfer_status |
07e059b5 | 4227 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, |
e0881a8e | 4228 | const char *annex, gdb_byte *readbuf, |
9b409511 YQ |
4229 | const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, |
4230 | ULONGEST *xfered_len) | |
07e059b5 | 4231 | { |
07e059b5 VP |
4232 | gdb_assert (object == TARGET_OBJECT_OSDATA); |
4233 | ||
9b409511 YQ |
4234 | *xfered_len = linux_common_xfer_osdata (annex, readbuf, offset, len); |
4235 | if (*xfered_len == 0) | |
4236 | return TARGET_XFER_EOF; | |
4237 | else | |
4238 | return TARGET_XFER_OK; | |
07e059b5 VP |
4239 | } |
4240 | ||
9b409511 | 4241 | static enum target_xfer_status |
10d6c8cd DJ |
4242 | linux_xfer_partial (struct target_ops *ops, enum target_object object, |
4243 | const char *annex, gdb_byte *readbuf, | |
9b409511 YQ |
4244 | const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, |
4245 | ULONGEST *xfered_len) | |
10d6c8cd | 4246 | { |
9b409511 | 4247 | enum target_xfer_status xfer; |
10d6c8cd DJ |
4248 | |
4249 | if (object == TARGET_OBJECT_AUXV) | |
9f2982ff | 4250 | return memory_xfer_auxv (ops, object, annex, readbuf, writebuf, |
9b409511 | 4251 | offset, len, xfered_len); |
10d6c8cd | 4252 | |
07e059b5 VP |
4253 | if (object == TARGET_OBJECT_OSDATA) |
4254 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
9b409511 | 4255 | offset, len, xfered_len); |
07e059b5 | 4256 | |
efcbbd14 UW |
4257 | if (object == TARGET_OBJECT_SPU) |
4258 | return linux_proc_xfer_spu (ops, object, annex, readbuf, writebuf, | |
9b409511 | 4259 | offset, len, xfered_len); |
efcbbd14 | 4260 | |
8f313923 JK |
4261 | /* GDB calculates all the addresses in possibly larget width of the address. |
4262 | Address width needs to be masked before its final use - either by | |
4263 | linux_proc_xfer_partial or inf_ptrace_xfer_partial. | |
4264 | ||
4265 | Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */ | |
4266 | ||
4267 | if (object == TARGET_OBJECT_MEMORY) | |
4268 | { | |
f5656ead | 4269 | int addr_bit = gdbarch_addr_bit (target_gdbarch ()); |
8f313923 JK |
4270 | |
4271 | if (addr_bit < (sizeof (ULONGEST) * HOST_CHAR_BIT)) | |
4272 | offset &= ((ULONGEST) 1 << addr_bit) - 1; | |
4273 | } | |
4274 | ||
10d6c8cd | 4275 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
9b409511 YQ |
4276 | offset, len, xfered_len); |
4277 | if (xfer != TARGET_XFER_EOF) | |
10d6c8cd DJ |
4278 | return xfer; |
4279 | ||
4280 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
9b409511 | 4281 | offset, len, xfered_len); |
10d6c8cd DJ |
4282 | } |
4283 | ||
5808517f YQ |
4284 | static void |
4285 | cleanup_target_stop (void *arg) | |
4286 | { | |
4287 | ptid_t *ptid = (ptid_t *) arg; | |
4288 | ||
4289 | gdb_assert (arg != NULL); | |
4290 | ||
4291 | /* Unpause all */ | |
a493e3e2 | 4292 | target_resume (*ptid, 0, GDB_SIGNAL_0); |
5808517f YQ |
4293 | } |
4294 | ||
4295 | static VEC(static_tracepoint_marker_p) * | |
c686c57f TT |
4296 | linux_child_static_tracepoint_markers_by_strid (struct target_ops *self, |
4297 | const char *strid) | |
5808517f YQ |
4298 | { |
4299 | char s[IPA_CMD_BUF_SIZE]; | |
4300 | struct cleanup *old_chain; | |
4301 | int pid = ptid_get_pid (inferior_ptid); | |
4302 | VEC(static_tracepoint_marker_p) *markers = NULL; | |
4303 | struct static_tracepoint_marker *marker = NULL; | |
4304 | char *p = s; | |
4305 | ptid_t ptid = ptid_build (pid, 0, 0); | |
4306 | ||
4307 | /* Pause all */ | |
4308 | target_stop (ptid); | |
4309 | ||
4310 | memcpy (s, "qTfSTM", sizeof ("qTfSTM")); | |
4311 | s[sizeof ("qTfSTM")] = 0; | |
4312 | ||
42476b70 | 4313 | agent_run_command (pid, s, strlen (s) + 1); |
5808517f YQ |
4314 | |
4315 | old_chain = make_cleanup (free_current_marker, &marker); | |
4316 | make_cleanup (cleanup_target_stop, &ptid); | |
4317 | ||
4318 | while (*p++ == 'm') | |
4319 | { | |
4320 | if (marker == NULL) | |
4321 | marker = XCNEW (struct static_tracepoint_marker); | |
4322 | ||
4323 | do | |
4324 | { | |
4325 | parse_static_tracepoint_marker_definition (p, &p, marker); | |
4326 | ||
4327 | if (strid == NULL || strcmp (strid, marker->str_id) == 0) | |
4328 | { | |
4329 | VEC_safe_push (static_tracepoint_marker_p, | |
4330 | markers, marker); | |
4331 | marker = NULL; | |
4332 | } | |
4333 | else | |
4334 | { | |
4335 | release_static_tracepoint_marker (marker); | |
4336 | memset (marker, 0, sizeof (*marker)); | |
4337 | } | |
4338 | } | |
4339 | while (*p++ == ','); /* comma-separated list */ | |
4340 | ||
4341 | memcpy (s, "qTsSTM", sizeof ("qTsSTM")); | |
4342 | s[sizeof ("qTsSTM")] = 0; | |
42476b70 | 4343 | agent_run_command (pid, s, strlen (s) + 1); |
5808517f YQ |
4344 | p = s; |
4345 | } | |
4346 | ||
4347 | do_cleanups (old_chain); | |
4348 | ||
4349 | return markers; | |
4350 | } | |
4351 | ||
e9efe249 | 4352 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
4353 | it with local methods. */ |
4354 | ||
910122bf UW |
4355 | static void |
4356 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 4357 | { |
6d8fd2b7 | 4358 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
eb73ad13 | 4359 | t->to_remove_fork_catchpoint = linux_child_remove_fork_catchpoint; |
6d8fd2b7 | 4360 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; |
eb73ad13 | 4361 | t->to_remove_vfork_catchpoint = linux_child_remove_vfork_catchpoint; |
6d8fd2b7 | 4362 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; |
eb73ad13 | 4363 | t->to_remove_exec_catchpoint = linux_child_remove_exec_catchpoint; |
a96d9b2e | 4364 | t->to_set_syscall_catchpoint = linux_child_set_syscall_catchpoint; |
6d8fd2b7 | 4365 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; |
10d6c8cd | 4366 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
4367 | t->to_post_attach = linux_child_post_attach; |
4368 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
4369 | |
4370 | super_xfer_partial = t->to_xfer_partial; | |
4371 | t->to_xfer_partial = linux_xfer_partial; | |
5808517f YQ |
4372 | |
4373 | t->to_static_tracepoint_markers_by_strid | |
4374 | = linux_child_static_tracepoint_markers_by_strid; | |
910122bf UW |
4375 | } |
4376 | ||
4377 | struct target_ops * | |
4378 | linux_target (void) | |
4379 | { | |
4380 | struct target_ops *t; | |
4381 | ||
4382 | t = inf_ptrace_target (); | |
4383 | linux_target_install_ops (t); | |
4384 | ||
4385 | return t; | |
4386 | } | |
4387 | ||
4388 | struct target_ops * | |
7714d83a | 4389 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
4390 | { |
4391 | struct target_ops *t; | |
4392 | ||
4393 | t = inf_ptrace_trad_target (register_u_offset); | |
4394 | linux_target_install_ops (t); | |
10d6c8cd | 4395 | |
10d6c8cd DJ |
4396 | return t; |
4397 | } | |
4398 | ||
b84876c2 PA |
4399 | /* target_is_async_p implementation. */ |
4400 | ||
4401 | static int | |
6a109b6b | 4402 | linux_nat_is_async_p (struct target_ops *ops) |
b84876c2 | 4403 | { |
198297aa | 4404 | return linux_is_async_p (); |
b84876c2 PA |
4405 | } |
4406 | ||
4407 | /* target_can_async_p implementation. */ | |
4408 | ||
4409 | static int | |
6a109b6b | 4410 | linux_nat_can_async_p (struct target_ops *ops) |
b84876c2 PA |
4411 | { |
4412 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 4413 | it explicitly with the "set target-async" command. |
b84876c2 | 4414 | Someday, linux will always be async. */ |
3dd5b83d | 4415 | return target_async_permitted; |
b84876c2 PA |
4416 | } |
4417 | ||
9908b566 | 4418 | static int |
2a9a2795 | 4419 | linux_nat_supports_non_stop (struct target_ops *self) |
9908b566 VP |
4420 | { |
4421 | return 1; | |
4422 | } | |
4423 | ||
fbea99ea PA |
4424 | /* to_always_non_stop_p implementation. */ |
4425 | ||
4426 | static int | |
4427 | linux_nat_always_non_stop_p (struct target_ops *self) | |
4428 | { | |
f12899e9 | 4429 | return 1; |
fbea99ea PA |
4430 | } |
4431 | ||
d90e17a7 PA |
4432 | /* True if we want to support multi-process. To be removed when GDB |
4433 | supports multi-exec. */ | |
4434 | ||
2277426b | 4435 | int linux_multi_process = 1; |
d90e17a7 PA |
4436 | |
4437 | static int | |
86ce2668 | 4438 | linux_nat_supports_multi_process (struct target_ops *self) |
d90e17a7 PA |
4439 | { |
4440 | return linux_multi_process; | |
4441 | } | |
4442 | ||
03583c20 | 4443 | static int |
2bfc0540 | 4444 | linux_nat_supports_disable_randomization (struct target_ops *self) |
03583c20 UW |
4445 | { |
4446 | #ifdef HAVE_PERSONALITY | |
4447 | return 1; | |
4448 | #else | |
4449 | return 0; | |
4450 | #endif | |
4451 | } | |
4452 | ||
b84876c2 PA |
4453 | static int async_terminal_is_ours = 1; |
4454 | ||
4d4ca2a1 DE |
4455 | /* target_terminal_inferior implementation. |
4456 | ||
4457 | This is a wrapper around child_terminal_inferior to add async support. */ | |
b84876c2 PA |
4458 | |
4459 | static void | |
d2f640d4 | 4460 | linux_nat_terminal_inferior (struct target_ops *self) |
b84876c2 | 4461 | { |
d6b64346 | 4462 | child_terminal_inferior (self); |
b84876c2 | 4463 | |
d9d2d8b6 | 4464 | /* Calls to target_terminal_*() are meant to be idempotent. */ |
b84876c2 PA |
4465 | if (!async_terminal_is_ours) |
4466 | return; | |
4467 | ||
b84876c2 PA |
4468 | async_terminal_is_ours = 0; |
4469 | set_sigint_trap (); | |
4470 | } | |
4471 | ||
4d4ca2a1 DE |
4472 | /* target_terminal_ours implementation. |
4473 | ||
4474 | This is a wrapper around child_terminal_ours to add async support (and | |
4475 | implement the target_terminal_ours vs target_terminal_ours_for_output | |
4476 | distinction). child_terminal_ours is currently no different than | |
4477 | child_terminal_ours_for_output. | |
4478 | We leave target_terminal_ours_for_output alone, leaving it to | |
4479 | child_terminal_ours_for_output. */ | |
b84876c2 | 4480 | |
2c0b251b | 4481 | static void |
e3594fd1 | 4482 | linux_nat_terminal_ours (struct target_ops *self) |
b84876c2 | 4483 | { |
b84876c2 PA |
4484 | /* GDB should never give the terminal to the inferior if the |
4485 | inferior is running in the background (run&, continue&, etc.), | |
4486 | but claiming it sure should. */ | |
d6b64346 | 4487 | child_terminal_ours (self); |
b84876c2 | 4488 | |
b84876c2 PA |
4489 | if (async_terminal_is_ours) |
4490 | return; | |
4491 | ||
4492 | clear_sigint_trap (); | |
b84876c2 PA |
4493 | async_terminal_is_ours = 1; |
4494 | } | |
4495 | ||
7feb7d06 PA |
4496 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4497 | so we notice when any child changes state, and notify the | |
4498 | event-loop; it allows us to use sigsuspend in linux_nat_wait_1 | |
4499 | above to wait for the arrival of a SIGCHLD. */ | |
4500 | ||
b84876c2 | 4501 | static void |
7feb7d06 | 4502 | sigchld_handler (int signo) |
b84876c2 | 4503 | { |
7feb7d06 PA |
4504 | int old_errno = errno; |
4505 | ||
01124a23 DE |
4506 | if (debug_linux_nat) |
4507 | ui_file_write_async_safe (gdb_stdlog, | |
4508 | "sigchld\n", sizeof ("sigchld\n") - 1); | |
7feb7d06 PA |
4509 | |
4510 | if (signo == SIGCHLD | |
4511 | && linux_nat_event_pipe[0] != -1) | |
4512 | async_file_mark (); /* Let the event loop know that there are | |
4513 | events to handle. */ | |
4514 | ||
4515 | errno = old_errno; | |
4516 | } | |
4517 | ||
4518 | /* Callback registered with the target events file descriptor. */ | |
4519 | ||
4520 | static void | |
4521 | handle_target_event (int error, gdb_client_data client_data) | |
4522 | { | |
6a3753b3 | 4523 | inferior_event_handler (INF_REG_EVENT, NULL); |
7feb7d06 PA |
4524 | } |
4525 | ||
4526 | /* Create/destroy the target events pipe. Returns previous state. */ | |
4527 | ||
4528 | static int | |
4529 | linux_async_pipe (int enable) | |
4530 | { | |
198297aa | 4531 | int previous = linux_is_async_p (); |
7feb7d06 PA |
4532 | |
4533 | if (previous != enable) | |
4534 | { | |
4535 | sigset_t prev_mask; | |
4536 | ||
12696c10 PA |
4537 | /* Block child signals while we create/destroy the pipe, as |
4538 | their handler writes to it. */ | |
7feb7d06 PA |
4539 | block_child_signals (&prev_mask); |
4540 | ||
4541 | if (enable) | |
4542 | { | |
614c279d | 4543 | if (gdb_pipe_cloexec (linux_nat_event_pipe) == -1) |
7feb7d06 PA |
4544 | internal_error (__FILE__, __LINE__, |
4545 | "creating event pipe failed."); | |
4546 | ||
4547 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4548 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4549 | } | |
4550 | else | |
4551 | { | |
4552 | close (linux_nat_event_pipe[0]); | |
4553 | close (linux_nat_event_pipe[1]); | |
4554 | linux_nat_event_pipe[0] = -1; | |
4555 | linux_nat_event_pipe[1] = -1; | |
4556 | } | |
4557 | ||
4558 | restore_child_signals_mask (&prev_mask); | |
4559 | } | |
4560 | ||
4561 | return previous; | |
b84876c2 PA |
4562 | } |
4563 | ||
4564 | /* target_async implementation. */ | |
4565 | ||
4566 | static void | |
6a3753b3 | 4567 | linux_nat_async (struct target_ops *ops, int enable) |
b84876c2 | 4568 | { |
6a3753b3 | 4569 | if (enable) |
b84876c2 | 4570 | { |
7feb7d06 PA |
4571 | if (!linux_async_pipe (1)) |
4572 | { | |
4573 | add_file_handler (linux_nat_event_pipe[0], | |
4574 | handle_target_event, NULL); | |
4575 | /* There may be pending events to handle. Tell the event loop | |
4576 | to poll them. */ | |
4577 | async_file_mark (); | |
4578 | } | |
b84876c2 PA |
4579 | } |
4580 | else | |
4581 | { | |
b84876c2 | 4582 | delete_file_handler (linux_nat_event_pipe[0]); |
7feb7d06 | 4583 | linux_async_pipe (0); |
b84876c2 PA |
4584 | } |
4585 | return; | |
4586 | } | |
4587 | ||
a493e3e2 | 4588 | /* Stop an LWP, and push a GDB_SIGNAL_0 stop status if no other |
252fbfc8 PA |
4589 | event came out. */ |
4590 | ||
4c28f408 | 4591 | static int |
252fbfc8 | 4592 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 4593 | { |
d90e17a7 | 4594 | if (!lwp->stopped) |
252fbfc8 | 4595 | { |
d90e17a7 PA |
4596 | if (debug_linux_nat) |
4597 | fprintf_unfiltered (gdb_stdlog, | |
4598 | "LNSL: running -> suspending %s\n", | |
4599 | target_pid_to_str (lwp->ptid)); | |
252fbfc8 | 4600 | |
252fbfc8 | 4601 | |
25289eb2 PA |
4602 | if (lwp->last_resume_kind == resume_stop) |
4603 | { | |
4604 | if (debug_linux_nat) | |
4605 | fprintf_unfiltered (gdb_stdlog, | |
4606 | "linux-nat: already stopping LWP %ld at " | |
4607 | "GDB's request\n", | |
4608 | ptid_get_lwp (lwp->ptid)); | |
4609 | return 0; | |
4610 | } | |
252fbfc8 | 4611 | |
25289eb2 PA |
4612 | stop_callback (lwp, NULL); |
4613 | lwp->last_resume_kind = resume_stop; | |
d90e17a7 PA |
4614 | } |
4615 | else | |
4616 | { | |
4617 | /* Already known to be stopped; do nothing. */ | |
252fbfc8 | 4618 | |
d90e17a7 PA |
4619 | if (debug_linux_nat) |
4620 | { | |
e09875d4 | 4621 | if (find_thread_ptid (lwp->ptid)->stop_requested) |
3e43a32a MS |
4622 | fprintf_unfiltered (gdb_stdlog, |
4623 | "LNSL: already stopped/stop_requested %s\n", | |
d90e17a7 PA |
4624 | target_pid_to_str (lwp->ptid)); |
4625 | else | |
3e43a32a MS |
4626 | fprintf_unfiltered (gdb_stdlog, |
4627 | "LNSL: already stopped/no " | |
4628 | "stop_requested yet %s\n", | |
d90e17a7 | 4629 | target_pid_to_str (lwp->ptid)); |
252fbfc8 PA |
4630 | } |
4631 | } | |
4c28f408 PA |
4632 | return 0; |
4633 | } | |
4634 | ||
4635 | static void | |
1eab8a48 | 4636 | linux_nat_stop (struct target_ops *self, ptid_t ptid) |
4c28f408 | 4637 | { |
bfedc46a PA |
4638 | iterate_over_lwps (ptid, linux_nat_stop_lwp, NULL); |
4639 | } | |
4640 | ||
d90e17a7 | 4641 | static void |
de90e03d | 4642 | linux_nat_close (struct target_ops *self) |
d90e17a7 PA |
4643 | { |
4644 | /* Unregister from the event loop. */ | |
9debeba0 | 4645 | if (linux_nat_is_async_p (self)) |
6a3753b3 | 4646 | linux_nat_async (self, 0); |
d90e17a7 | 4647 | |
d90e17a7 | 4648 | if (linux_ops->to_close) |
de90e03d | 4649 | linux_ops->to_close (linux_ops); |
6a3cb8e8 PA |
4650 | |
4651 | super_close (self); | |
d90e17a7 PA |
4652 | } |
4653 | ||
c0694254 PA |
4654 | /* When requests are passed down from the linux-nat layer to the |
4655 | single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are | |
4656 | used. The address space pointer is stored in the inferior object, | |
4657 | but the common code that is passed such ptid can't tell whether | |
4658 | lwpid is a "main" process id or not (it assumes so). We reverse | |
4659 | look up the "main" process id from the lwp here. */ | |
4660 | ||
70221824 | 4661 | static struct address_space * |
c0694254 PA |
4662 | linux_nat_thread_address_space (struct target_ops *t, ptid_t ptid) |
4663 | { | |
4664 | struct lwp_info *lwp; | |
4665 | struct inferior *inf; | |
4666 | int pid; | |
4667 | ||
dfd4cc63 | 4668 | if (ptid_get_lwp (ptid) == 0) |
c0694254 PA |
4669 | { |
4670 | /* An (lwpid,0,0) ptid. Look up the lwp object to get at the | |
4671 | tgid. */ | |
4672 | lwp = find_lwp_pid (ptid); | |
dfd4cc63 | 4673 | pid = ptid_get_pid (lwp->ptid); |
c0694254 PA |
4674 | } |
4675 | else | |
4676 | { | |
4677 | /* A (pid,lwpid,0) ptid. */ | |
dfd4cc63 | 4678 | pid = ptid_get_pid (ptid); |
c0694254 PA |
4679 | } |
4680 | ||
4681 | inf = find_inferior_pid (pid); | |
4682 | gdb_assert (inf != NULL); | |
4683 | return inf->aspace; | |
4684 | } | |
4685 | ||
dc146f7c VP |
4686 | /* Return the cached value of the processor core for thread PTID. */ |
4687 | ||
70221824 | 4688 | static int |
dc146f7c VP |
4689 | linux_nat_core_of_thread (struct target_ops *ops, ptid_t ptid) |
4690 | { | |
4691 | struct lwp_info *info = find_lwp_pid (ptid); | |
e0881a8e | 4692 | |
dc146f7c VP |
4693 | if (info) |
4694 | return info->core; | |
4695 | return -1; | |
4696 | } | |
4697 | ||
7a6a1731 GB |
4698 | /* Implementation of to_filesystem_is_local. */ |
4699 | ||
4700 | static int | |
4701 | linux_nat_filesystem_is_local (struct target_ops *ops) | |
4702 | { | |
4703 | struct inferior *inf = current_inferior (); | |
4704 | ||
4705 | if (inf->fake_pid_p || inf->pid == 0) | |
4706 | return 1; | |
4707 | ||
4708 | return linux_ns_same (inf->pid, LINUX_NS_MNT); | |
4709 | } | |
4710 | ||
4711 | /* Convert the INF argument passed to a to_fileio_* method | |
4712 | to a process ID suitable for passing to its corresponding | |
4713 | linux_mntns_* function. If INF is non-NULL then the | |
4714 | caller is requesting the filesystem seen by INF. If INF | |
4715 | is NULL then the caller is requesting the filesystem seen | |
4716 | by the GDB. We fall back to GDB's filesystem in the case | |
4717 | that INF is non-NULL but its PID is unknown. */ | |
4718 | ||
4719 | static pid_t | |
4720 | linux_nat_fileio_pid_of (struct inferior *inf) | |
4721 | { | |
4722 | if (inf == NULL || inf->fake_pid_p || inf->pid == 0) | |
4723 | return getpid (); | |
4724 | else | |
4725 | return inf->pid; | |
4726 | } | |
4727 | ||
4728 | /* Implementation of to_fileio_open. */ | |
4729 | ||
4730 | static int | |
4731 | linux_nat_fileio_open (struct target_ops *self, | |
4732 | struct inferior *inf, const char *filename, | |
4313b8c0 GB |
4733 | int flags, int mode, int warn_if_slow, |
4734 | int *target_errno) | |
7a6a1731 GB |
4735 | { |
4736 | int nat_flags; | |
4737 | mode_t nat_mode; | |
4738 | int fd; | |
4739 | ||
4740 | if (fileio_to_host_openflags (flags, &nat_flags) == -1 | |
4741 | || fileio_to_host_mode (mode, &nat_mode) == -1) | |
4742 | { | |
4743 | *target_errno = FILEIO_EINVAL; | |
4744 | return -1; | |
4745 | } | |
4746 | ||
4747 | fd = linux_mntns_open_cloexec (linux_nat_fileio_pid_of (inf), | |
4748 | filename, nat_flags, nat_mode); | |
4749 | if (fd == -1) | |
4750 | *target_errno = host_to_fileio_error (errno); | |
4751 | ||
4752 | return fd; | |
4753 | } | |
4754 | ||
4755 | /* Implementation of to_fileio_readlink. */ | |
4756 | ||
4757 | static char * | |
4758 | linux_nat_fileio_readlink (struct target_ops *self, | |
4759 | struct inferior *inf, const char *filename, | |
4760 | int *target_errno) | |
4761 | { | |
4762 | char buf[PATH_MAX]; | |
4763 | int len; | |
4764 | char *ret; | |
4765 | ||
4766 | len = linux_mntns_readlink (linux_nat_fileio_pid_of (inf), | |
4767 | filename, buf, sizeof (buf)); | |
4768 | if (len < 0) | |
4769 | { | |
4770 | *target_errno = host_to_fileio_error (errno); | |
4771 | return NULL; | |
4772 | } | |
4773 | ||
224c3ddb | 4774 | ret = (char *) xmalloc (len + 1); |
7a6a1731 GB |
4775 | memcpy (ret, buf, len); |
4776 | ret[len] = '\0'; | |
4777 | return ret; | |
4778 | } | |
4779 | ||
4780 | /* Implementation of to_fileio_unlink. */ | |
4781 | ||
4782 | static int | |
4783 | linux_nat_fileio_unlink (struct target_ops *self, | |
4784 | struct inferior *inf, const char *filename, | |
4785 | int *target_errno) | |
4786 | { | |
4787 | int ret; | |
4788 | ||
4789 | ret = linux_mntns_unlink (linux_nat_fileio_pid_of (inf), | |
4790 | filename); | |
4791 | if (ret == -1) | |
4792 | *target_errno = host_to_fileio_error (errno); | |
4793 | ||
4794 | return ret; | |
4795 | } | |
4796 | ||
aa01bd36 PA |
4797 | /* Implementation of the to_thread_events method. */ |
4798 | ||
4799 | static void | |
4800 | linux_nat_thread_events (struct target_ops *ops, int enable) | |
4801 | { | |
4802 | report_thread_events = enable; | |
4803 | } | |
4804 | ||
f973ed9c DJ |
4805 | void |
4806 | linux_nat_add_target (struct target_ops *t) | |
4807 | { | |
f973ed9c DJ |
4808 | /* Save the provided single-threaded target. We save this in a separate |
4809 | variable because another target we've inherited from (e.g. inf-ptrace) | |
4810 | may have saved a pointer to T; we want to use it for the final | |
4811 | process stratum target. */ | |
4812 | linux_ops_saved = *t; | |
4813 | linux_ops = &linux_ops_saved; | |
4814 | ||
4815 | /* Override some methods for multithreading. */ | |
b84876c2 | 4816 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
4817 | t->to_attach = linux_nat_attach; |
4818 | t->to_detach = linux_nat_detach; | |
4819 | t->to_resume = linux_nat_resume; | |
4820 | t->to_wait = linux_nat_wait; | |
2455069d | 4821 | t->to_pass_signals = linux_nat_pass_signals; |
f973ed9c DJ |
4822 | t->to_xfer_partial = linux_nat_xfer_partial; |
4823 | t->to_kill = linux_nat_kill; | |
4824 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
4825 | t->to_thread_alive = linux_nat_thread_alive; | |
8a06aea7 | 4826 | t->to_update_thread_list = linux_nat_update_thread_list; |
f973ed9c | 4827 | t->to_pid_to_str = linux_nat_pid_to_str; |
4694da01 | 4828 | t->to_thread_name = linux_nat_thread_name; |
f973ed9c | 4829 | t->to_has_thread_control = tc_schedlock; |
c0694254 | 4830 | t->to_thread_address_space = linux_nat_thread_address_space; |
ebec9a0f PA |
4831 | t->to_stopped_by_watchpoint = linux_nat_stopped_by_watchpoint; |
4832 | t->to_stopped_data_address = linux_nat_stopped_data_address; | |
faf09f01 PA |
4833 | t->to_stopped_by_sw_breakpoint = linux_nat_stopped_by_sw_breakpoint; |
4834 | t->to_supports_stopped_by_sw_breakpoint = linux_nat_supports_stopped_by_sw_breakpoint; | |
4835 | t->to_stopped_by_hw_breakpoint = linux_nat_stopped_by_hw_breakpoint; | |
4836 | t->to_supports_stopped_by_hw_breakpoint = linux_nat_supports_stopped_by_hw_breakpoint; | |
aa01bd36 | 4837 | t->to_thread_events = linux_nat_thread_events; |
f973ed9c | 4838 | |
b84876c2 PA |
4839 | t->to_can_async_p = linux_nat_can_async_p; |
4840 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 4841 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
fbea99ea | 4842 | t->to_always_non_stop_p = linux_nat_always_non_stop_p; |
b84876c2 | 4843 | t->to_async = linux_nat_async; |
b84876c2 PA |
4844 | t->to_terminal_inferior = linux_nat_terminal_inferior; |
4845 | t->to_terminal_ours = linux_nat_terminal_ours; | |
6a3cb8e8 PA |
4846 | |
4847 | super_close = t->to_close; | |
d90e17a7 | 4848 | t->to_close = linux_nat_close; |
b84876c2 | 4849 | |
4c28f408 PA |
4850 | t->to_stop = linux_nat_stop; |
4851 | ||
d90e17a7 PA |
4852 | t->to_supports_multi_process = linux_nat_supports_multi_process; |
4853 | ||
03583c20 UW |
4854 | t->to_supports_disable_randomization |
4855 | = linux_nat_supports_disable_randomization; | |
4856 | ||
dc146f7c VP |
4857 | t->to_core_of_thread = linux_nat_core_of_thread; |
4858 | ||
7a6a1731 GB |
4859 | t->to_filesystem_is_local = linux_nat_filesystem_is_local; |
4860 | t->to_fileio_open = linux_nat_fileio_open; | |
4861 | t->to_fileio_readlink = linux_nat_fileio_readlink; | |
4862 | t->to_fileio_unlink = linux_nat_fileio_unlink; | |
4863 | ||
f973ed9c DJ |
4864 | /* We don't change the stratum; this target will sit at |
4865 | process_stratum and thread_db will set at thread_stratum. This | |
4866 | is a little strange, since this is a multi-threaded-capable | |
4867 | target, but we want to be on the stack below thread_db, and we | |
4868 | also want to be used for single-threaded processes. */ | |
4869 | ||
4870 | add_target (t); | |
f973ed9c DJ |
4871 | } |
4872 | ||
9f0bdab8 DJ |
4873 | /* Register a method to call whenever a new thread is attached. */ |
4874 | void | |
7b50312a PA |
4875 | linux_nat_set_new_thread (struct target_ops *t, |
4876 | void (*new_thread) (struct lwp_info *)) | |
9f0bdab8 DJ |
4877 | { |
4878 | /* Save the pointer. We only support a single registered instance | |
4879 | of the GNU/Linux native target, so we do not need to map this to | |
4880 | T. */ | |
4881 | linux_nat_new_thread = new_thread; | |
4882 | } | |
4883 | ||
26cb8b7c PA |
4884 | /* See declaration in linux-nat.h. */ |
4885 | ||
4886 | void | |
4887 | linux_nat_set_new_fork (struct target_ops *t, | |
4888 | linux_nat_new_fork_ftype *new_fork) | |
4889 | { | |
4890 | /* Save the pointer. */ | |
4891 | linux_nat_new_fork = new_fork; | |
4892 | } | |
4893 | ||
4894 | /* See declaration in linux-nat.h. */ | |
4895 | ||
4896 | void | |
4897 | linux_nat_set_forget_process (struct target_ops *t, | |
4898 | linux_nat_forget_process_ftype *fn) | |
4899 | { | |
4900 | /* Save the pointer. */ | |
4901 | linux_nat_forget_process_hook = fn; | |
4902 | } | |
4903 | ||
4904 | /* See declaration in linux-nat.h. */ | |
4905 | ||
4906 | void | |
4907 | linux_nat_forget_process (pid_t pid) | |
4908 | { | |
4909 | if (linux_nat_forget_process_hook != NULL) | |
4910 | linux_nat_forget_process_hook (pid); | |
4911 | } | |
4912 | ||
5b009018 PA |
4913 | /* Register a method that converts a siginfo object between the layout |
4914 | that ptrace returns, and the layout in the architecture of the | |
4915 | inferior. */ | |
4916 | void | |
4917 | linux_nat_set_siginfo_fixup (struct target_ops *t, | |
a5362b9a | 4918 | int (*siginfo_fixup) (siginfo_t *, |
5b009018 PA |
4919 | gdb_byte *, |
4920 | int)) | |
4921 | { | |
4922 | /* Save the pointer. */ | |
4923 | linux_nat_siginfo_fixup = siginfo_fixup; | |
4924 | } | |
4925 | ||
7b50312a PA |
4926 | /* Register a method to call prior to resuming a thread. */ |
4927 | ||
4928 | void | |
4929 | linux_nat_set_prepare_to_resume (struct target_ops *t, | |
4930 | void (*prepare_to_resume) (struct lwp_info *)) | |
4931 | { | |
4932 | /* Save the pointer. */ | |
4933 | linux_nat_prepare_to_resume = prepare_to_resume; | |
4934 | } | |
4935 | ||
f865ee35 JK |
4936 | /* See linux-nat.h. */ |
4937 | ||
4938 | int | |
4939 | linux_nat_get_siginfo (ptid_t ptid, siginfo_t *siginfo) | |
9f0bdab8 | 4940 | { |
da559b09 | 4941 | int pid; |
9f0bdab8 | 4942 | |
dfd4cc63 | 4943 | pid = ptid_get_lwp (ptid); |
da559b09 | 4944 | if (pid == 0) |
dfd4cc63 | 4945 | pid = ptid_get_pid (ptid); |
f865ee35 | 4946 | |
da559b09 JK |
4947 | errno = 0; |
4948 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, siginfo); | |
4949 | if (errno != 0) | |
4950 | { | |
4951 | memset (siginfo, 0, sizeof (*siginfo)); | |
4952 | return 0; | |
4953 | } | |
f865ee35 | 4954 | return 1; |
9f0bdab8 DJ |
4955 | } |
4956 | ||
7b669087 GB |
4957 | /* See nat/linux-nat.h. */ |
4958 | ||
4959 | ptid_t | |
4960 | current_lwp_ptid (void) | |
4961 | { | |
4962 | gdb_assert (ptid_lwp_p (inferior_ptid)); | |
4963 | return inferior_ptid; | |
4964 | } | |
4965 | ||
2c0b251b PA |
4966 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
4967 | extern initialize_file_ftype _initialize_linux_nat; | |
4968 | ||
d6b0e80f AC |
4969 | void |
4970 | _initialize_linux_nat (void) | |
4971 | { | |
ccce17b0 YQ |
4972 | add_setshow_zuinteger_cmd ("lin-lwp", class_maintenance, |
4973 | &debug_linux_nat, _("\ | |
b84876c2 PA |
4974 | Set debugging of GNU/Linux lwp module."), _("\ |
4975 | Show debugging of GNU/Linux lwp module."), _("\ | |
4976 | Enables printf debugging output."), | |
ccce17b0 YQ |
4977 | NULL, |
4978 | show_debug_linux_nat, | |
4979 | &setdebuglist, &showdebuglist); | |
b84876c2 | 4980 | |
7a6a1731 GB |
4981 | add_setshow_boolean_cmd ("linux-namespaces", class_maintenance, |
4982 | &debug_linux_namespaces, _("\ | |
4983 | Set debugging of GNU/Linux namespaces module."), _("\ | |
4984 | Show debugging of GNU/Linux namespaces module."), _("\ | |
4985 | Enables printf debugging output."), | |
4986 | NULL, | |
4987 | NULL, | |
4988 | &setdebuglist, &showdebuglist); | |
4989 | ||
b84876c2 | 4990 | /* Save this mask as the default. */ |
d6b0e80f AC |
4991 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
4992 | ||
7feb7d06 PA |
4993 | /* Install a SIGCHLD handler. */ |
4994 | sigchld_action.sa_handler = sigchld_handler; | |
4995 | sigemptyset (&sigchld_action.sa_mask); | |
4996 | sigchld_action.sa_flags = SA_RESTART; | |
b84876c2 PA |
4997 | |
4998 | /* Make it the default. */ | |
7feb7d06 | 4999 | sigaction (SIGCHLD, &sigchld_action, NULL); |
d6b0e80f AC |
5000 | |
5001 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
5002 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
5003 | sigdelset (&suspend_mask, SIGCHLD); | |
5004 | ||
7feb7d06 | 5005 | sigemptyset (&blocked_mask); |
774113b0 PA |
5006 | |
5007 | lwp_lwpid_htab_create (); | |
d6b0e80f AC |
5008 | } |
5009 | \f | |
5010 | ||
5011 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
5012 | the GNU/Linux Threads library and therefore doesn't really belong | |
5013 | here. */ | |
5014 | ||
d6b0e80f AC |
5015 | /* Return the set of signals used by the threads library in *SET. */ |
5016 | ||
5017 | void | |
5018 | lin_thread_get_thread_signals (sigset_t *set) | |
5019 | { | |
d6b0e80f AC |
5020 | sigemptyset (set); |
5021 | ||
4a6ed09b PA |
5022 | /* NPTL reserves the first two RT signals, but does not provide any |
5023 | way for the debugger to query the signal numbers - fortunately | |
5024 | they don't change. */ | |
5025 | sigaddset (set, __SIGRTMIN); | |
5026 | sigaddset (set, __SIGRTMIN + 1); | |
d6b0e80f | 5027 | } |