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); |
710151dd | 823 | |
d6b0e80f | 824 | \f |
d6b0e80f | 825 | |
7b50312a PA |
826 | /* Destroy and free LP. */ |
827 | ||
828 | static void | |
829 | lwp_free (struct lwp_info *lp) | |
830 | { | |
831 | xfree (lp->arch_private); | |
832 | xfree (lp); | |
833 | } | |
834 | ||
774113b0 | 835 | /* Traversal function for purge_lwp_list. */ |
d90e17a7 | 836 | |
774113b0 PA |
837 | static int |
838 | lwp_lwpid_htab_remove_pid (void **slot, void *info) | |
d90e17a7 | 839 | { |
774113b0 PA |
840 | struct lwp_info *lp = (struct lwp_info *) *slot; |
841 | int pid = *(int *) info; | |
d90e17a7 | 842 | |
774113b0 | 843 | if (ptid_get_pid (lp->ptid) == pid) |
d90e17a7 | 844 | { |
774113b0 PA |
845 | htab_clear_slot (lwp_lwpid_htab, slot); |
846 | lwp_list_remove (lp); | |
847 | lwp_free (lp); | |
848 | } | |
d90e17a7 | 849 | |
774113b0 PA |
850 | return 1; |
851 | } | |
d90e17a7 | 852 | |
774113b0 PA |
853 | /* Remove all LWPs belong to PID from the lwp list. */ |
854 | ||
855 | static void | |
856 | purge_lwp_list (int pid) | |
857 | { | |
858 | htab_traverse_noresize (lwp_lwpid_htab, lwp_lwpid_htab_remove_pid, &pid); | |
d90e17a7 PA |
859 | } |
860 | ||
26cb8b7c PA |
861 | /* Add the LWP specified by PTID to the list. PTID is the first LWP |
862 | in the process. Return a pointer to the structure describing the | |
863 | new LWP. | |
864 | ||
865 | This differs from add_lwp in that we don't let the arch specific | |
866 | bits know about this new thread. Current clients of this callback | |
867 | take the opportunity to install watchpoints in the new thread, and | |
868 | we shouldn't do that for the first thread. If we're spawning a | |
869 | child ("run"), the thread executes the shell wrapper first, and we | |
870 | shouldn't touch it until it execs the program we want to debug. | |
871 | For "attach", it'd be okay to call the callback, but it's not | |
872 | necessary, because watchpoints can't yet have been inserted into | |
873 | the inferior. */ | |
d6b0e80f AC |
874 | |
875 | static struct lwp_info * | |
26cb8b7c | 876 | add_initial_lwp (ptid_t ptid) |
d6b0e80f AC |
877 | { |
878 | struct lwp_info *lp; | |
879 | ||
dfd4cc63 | 880 | gdb_assert (ptid_lwp_p (ptid)); |
d6b0e80f | 881 | |
8d749320 | 882 | lp = XNEW (struct lwp_info); |
d6b0e80f AC |
883 | |
884 | memset (lp, 0, sizeof (struct lwp_info)); | |
885 | ||
25289eb2 | 886 | lp->last_resume_kind = resume_continue; |
d6b0e80f AC |
887 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; |
888 | ||
889 | lp->ptid = ptid; | |
dc146f7c | 890 | lp->core = -1; |
d6b0e80f | 891 | |
774113b0 PA |
892 | /* Add to sorted-by-reverse-creation-order list. */ |
893 | lwp_list_add (lp); | |
894 | ||
895 | /* Add to keyed-by-pid htab. */ | |
896 | lwp_lwpid_htab_add_lwp (lp); | |
d6b0e80f | 897 | |
26cb8b7c PA |
898 | return lp; |
899 | } | |
900 | ||
901 | /* Add the LWP specified by PID to the list. Return a pointer to the | |
902 | structure describing the new LWP. The LWP should already be | |
903 | stopped. */ | |
904 | ||
905 | static struct lwp_info * | |
906 | add_lwp (ptid_t ptid) | |
907 | { | |
908 | struct lwp_info *lp; | |
909 | ||
910 | lp = add_initial_lwp (ptid); | |
911 | ||
6e012a6c PA |
912 | /* Let the arch specific bits know about this new thread. Current |
913 | clients of this callback take the opportunity to install | |
26cb8b7c PA |
914 | watchpoints in the new thread. We don't do this for the first |
915 | thread though. See add_initial_lwp. */ | |
916 | if (linux_nat_new_thread != NULL) | |
7b50312a | 917 | linux_nat_new_thread (lp); |
9f0bdab8 | 918 | |
d6b0e80f AC |
919 | return lp; |
920 | } | |
921 | ||
922 | /* Remove the LWP specified by PID from the list. */ | |
923 | ||
924 | static void | |
925 | delete_lwp (ptid_t ptid) | |
926 | { | |
774113b0 PA |
927 | struct lwp_info *lp; |
928 | void **slot; | |
929 | struct lwp_info dummy; | |
d6b0e80f | 930 | |
774113b0 PA |
931 | dummy.ptid = ptid; |
932 | slot = htab_find_slot (lwp_lwpid_htab, &dummy, NO_INSERT); | |
933 | if (slot == NULL) | |
934 | return; | |
d6b0e80f | 935 | |
774113b0 PA |
936 | lp = *(struct lwp_info **) slot; |
937 | gdb_assert (lp != NULL); | |
d6b0e80f | 938 | |
774113b0 | 939 | htab_clear_slot (lwp_lwpid_htab, slot); |
d6b0e80f | 940 | |
774113b0 PA |
941 | /* Remove from sorted-by-creation-order list. */ |
942 | lwp_list_remove (lp); | |
d6b0e80f | 943 | |
774113b0 | 944 | /* Release. */ |
7b50312a | 945 | lwp_free (lp); |
d6b0e80f AC |
946 | } |
947 | ||
948 | /* Return a pointer to the structure describing the LWP corresponding | |
949 | to PID. If no corresponding LWP could be found, return NULL. */ | |
950 | ||
951 | static struct lwp_info * | |
952 | find_lwp_pid (ptid_t ptid) | |
953 | { | |
954 | struct lwp_info *lp; | |
955 | int lwp; | |
774113b0 | 956 | struct lwp_info dummy; |
d6b0e80f | 957 | |
dfd4cc63 LM |
958 | if (ptid_lwp_p (ptid)) |
959 | lwp = ptid_get_lwp (ptid); | |
d6b0e80f | 960 | else |
dfd4cc63 | 961 | lwp = ptid_get_pid (ptid); |
d6b0e80f | 962 | |
774113b0 PA |
963 | dummy.ptid = ptid_build (0, lwp, 0); |
964 | lp = (struct lwp_info *) htab_find (lwp_lwpid_htab, &dummy); | |
965 | return lp; | |
d6b0e80f AC |
966 | } |
967 | ||
6d4ee8c6 | 968 | /* See nat/linux-nat.h. */ |
d6b0e80f AC |
969 | |
970 | struct lwp_info * | |
d90e17a7 | 971 | iterate_over_lwps (ptid_t filter, |
6d4ee8c6 | 972 | iterate_over_lwps_ftype callback, |
d90e17a7 | 973 | void *data) |
d6b0e80f AC |
974 | { |
975 | struct lwp_info *lp, *lpnext; | |
976 | ||
977 | for (lp = lwp_list; lp; lp = lpnext) | |
978 | { | |
979 | lpnext = lp->next; | |
d90e17a7 PA |
980 | |
981 | if (ptid_match (lp->ptid, filter)) | |
982 | { | |
6d4ee8c6 | 983 | if ((*callback) (lp, data) != 0) |
d90e17a7 PA |
984 | return lp; |
985 | } | |
d6b0e80f AC |
986 | } |
987 | ||
988 | return NULL; | |
989 | } | |
990 | ||
2277426b PA |
991 | /* Update our internal state when changing from one checkpoint to |
992 | another indicated by NEW_PTID. We can only switch single-threaded | |
993 | applications, so we only create one new LWP, and the previous list | |
994 | is discarded. */ | |
f973ed9c DJ |
995 | |
996 | void | |
997 | linux_nat_switch_fork (ptid_t new_ptid) | |
998 | { | |
999 | struct lwp_info *lp; | |
1000 | ||
dfd4cc63 | 1001 | purge_lwp_list (ptid_get_pid (inferior_ptid)); |
2277426b | 1002 | |
f973ed9c DJ |
1003 | lp = add_lwp (new_ptid); |
1004 | lp->stopped = 1; | |
e26af52f | 1005 | |
2277426b PA |
1006 | /* This changes the thread's ptid while preserving the gdb thread |
1007 | num. Also changes the inferior pid, while preserving the | |
1008 | inferior num. */ | |
1009 | thread_change_ptid (inferior_ptid, new_ptid); | |
1010 | ||
1011 | /* We've just told GDB core that the thread changed target id, but, | |
1012 | in fact, it really is a different thread, with different register | |
1013 | contents. */ | |
1014 | registers_changed (); | |
e26af52f DJ |
1015 | } |
1016 | ||
e26af52f DJ |
1017 | /* Handle the exit of a single thread LP. */ |
1018 | ||
1019 | static void | |
1020 | exit_lwp (struct lwp_info *lp) | |
1021 | { | |
e09875d4 | 1022 | struct thread_info *th = find_thread_ptid (lp->ptid); |
063bfe2e VP |
1023 | |
1024 | if (th) | |
e26af52f | 1025 | { |
17faa917 DJ |
1026 | if (print_thread_events) |
1027 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1028 | ||
4f8d22e3 | 1029 | delete_thread (lp->ptid); |
e26af52f DJ |
1030 | } |
1031 | ||
1032 | delete_lwp (lp->ptid); | |
1033 | } | |
1034 | ||
a0ef4274 DJ |
1035 | /* Wait for the LWP specified by LP, which we have just attached to. |
1036 | Returns a wait status for that LWP, to cache. */ | |
1037 | ||
1038 | static int | |
4a6ed09b | 1039 | linux_nat_post_attach_wait (ptid_t ptid, int first, int *signalled) |
a0ef4274 | 1040 | { |
dfd4cc63 | 1041 | pid_t new_pid, pid = ptid_get_lwp (ptid); |
a0ef4274 DJ |
1042 | int status; |
1043 | ||
644cebc9 | 1044 | if (linux_proc_pid_is_stopped (pid)) |
a0ef4274 DJ |
1045 | { |
1046 | if (debug_linux_nat) | |
1047 | fprintf_unfiltered (gdb_stdlog, | |
1048 | "LNPAW: Attaching to a stopped process\n"); | |
1049 | ||
1050 | /* The process is definitely stopped. It is in a job control | |
1051 | stop, unless the kernel predates the TASK_STOPPED / | |
1052 | TASK_TRACED distinction, in which case it might be in a | |
1053 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1054 | can kill it, signal it, et cetera. | |
1055 | ||
1056 | First make sure there is a pending SIGSTOP. Since we are | |
1057 | already attached, the process can not transition from stopped | |
1058 | to running without a PTRACE_CONT; so we know this signal will | |
1059 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1060 | probably already in the queue (unless this kernel is old | |
1061 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1062 | is not an RT signal, it can only be queued once. */ | |
1063 | kill_lwp (pid, SIGSTOP); | |
1064 | ||
1065 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1066 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1067 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1068 | } | |
1069 | ||
1070 | /* Make sure the initial process is stopped. The user-level threads | |
1071 | layer might want to poke around in the inferior, and that won't | |
1072 | work if things haven't stabilized yet. */ | |
4a6ed09b | 1073 | new_pid = my_waitpid (pid, &status, __WALL); |
dacc9cb2 PP |
1074 | gdb_assert (pid == new_pid); |
1075 | ||
1076 | if (!WIFSTOPPED (status)) | |
1077 | { | |
1078 | /* The pid we tried to attach has apparently just exited. */ | |
1079 | if (debug_linux_nat) | |
1080 | fprintf_unfiltered (gdb_stdlog, "LNPAW: Failed to stop %d: %s", | |
1081 | pid, status_to_str (status)); | |
1082 | return status; | |
1083 | } | |
a0ef4274 DJ |
1084 | |
1085 | if (WSTOPSIG (status) != SIGSTOP) | |
1086 | { | |
1087 | *signalled = 1; | |
1088 | if (debug_linux_nat) | |
1089 | fprintf_unfiltered (gdb_stdlog, | |
1090 | "LNPAW: Received %s after attaching\n", | |
1091 | status_to_str (status)); | |
1092 | } | |
1093 | ||
1094 | return status; | |
1095 | } | |
1096 | ||
b84876c2 | 1097 | static void |
136d6dae VP |
1098 | linux_nat_create_inferior (struct target_ops *ops, |
1099 | char *exec_file, char *allargs, char **env, | |
b84876c2 PA |
1100 | int from_tty) |
1101 | { | |
8cc73a39 SDJ |
1102 | struct cleanup *restore_personality |
1103 | = maybe_disable_address_space_randomization (disable_randomization); | |
b84876c2 PA |
1104 | |
1105 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1106 | we have to mask the async mode. */ | |
1107 | ||
2455069d | 1108 | /* Make sure we report all signals during startup. */ |
94bedb42 | 1109 | linux_nat_pass_signals (ops, 0, NULL); |
2455069d | 1110 | |
136d6dae | 1111 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 | 1112 | |
8cc73a39 | 1113 | do_cleanups (restore_personality); |
b84876c2 PA |
1114 | } |
1115 | ||
8784d563 PA |
1116 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
1117 | already attached. Returns true if a new LWP is found, false | |
1118 | otherwise. */ | |
1119 | ||
1120 | static int | |
1121 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1122 | { | |
1123 | struct lwp_info *lp; | |
1124 | ||
1125 | /* Ignore LWPs we're already attached to. */ | |
1126 | lp = find_lwp_pid (ptid); | |
1127 | if (lp == NULL) | |
1128 | { | |
1129 | int lwpid = ptid_get_lwp (ptid); | |
1130 | ||
1131 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) < 0) | |
1132 | { | |
1133 | int err = errno; | |
1134 | ||
1135 | /* Be quiet if we simply raced with the thread exiting. | |
1136 | EPERM is returned if the thread's task still exists, and | |
1137 | is marked as exited or zombie, as well as other | |
1138 | conditions, so in that case, confirm the status in | |
1139 | /proc/PID/status. */ | |
1140 | if (err == ESRCH | |
1141 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
1142 | { | |
1143 | if (debug_linux_nat) | |
1144 | { | |
1145 | fprintf_unfiltered (gdb_stdlog, | |
1146 | "Cannot attach to lwp %d: " | |
1147 | "thread is gone (%d: %s)\n", | |
1148 | lwpid, err, safe_strerror (err)); | |
1149 | } | |
1150 | } | |
1151 | else | |
1152 | { | |
f71f0b0d | 1153 | warning (_("Cannot attach to lwp %d: %s"), |
8784d563 PA |
1154 | lwpid, |
1155 | linux_ptrace_attach_fail_reason_string (ptid, | |
1156 | err)); | |
1157 | } | |
1158 | } | |
1159 | else | |
1160 | { | |
1161 | if (debug_linux_nat) | |
1162 | fprintf_unfiltered (gdb_stdlog, | |
1163 | "PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1164 | target_pid_to_str (ptid)); | |
1165 | ||
1166 | lp = add_lwp (ptid); | |
8784d563 PA |
1167 | |
1168 | /* The next time we wait for this LWP we'll see a SIGSTOP as | |
1169 | PTRACE_ATTACH brings it to a halt. */ | |
1170 | lp->signalled = 1; | |
1171 | ||
1172 | /* We need to wait for a stop before being able to make the | |
1173 | next ptrace call on this LWP. */ | |
1174 | lp->must_set_ptrace_flags = 1; | |
026a9174 PA |
1175 | |
1176 | /* So that wait collects the SIGSTOP. */ | |
1177 | lp->resumed = 1; | |
1178 | ||
1179 | /* Also add the LWP to gdb's thread list, in case a | |
1180 | matching libthread_db is not found (or the process uses | |
1181 | raw clone). */ | |
1182 | add_thread (lp->ptid); | |
1183 | set_running (lp->ptid, 1); | |
1184 | set_executing (lp->ptid, 1); | |
8784d563 PA |
1185 | } |
1186 | ||
1187 | return 1; | |
1188 | } | |
1189 | return 0; | |
1190 | } | |
1191 | ||
d6b0e80f | 1192 | static void |
c0939df1 | 1193 | linux_nat_attach (struct target_ops *ops, const char *args, int from_tty) |
d6b0e80f AC |
1194 | { |
1195 | struct lwp_info *lp; | |
d6b0e80f | 1196 | int status; |
af990527 | 1197 | ptid_t ptid; |
d6b0e80f | 1198 | |
2455069d | 1199 | /* Make sure we report all signals during attach. */ |
94bedb42 | 1200 | linux_nat_pass_signals (ops, 0, NULL); |
2455069d | 1201 | |
492d29ea | 1202 | TRY |
87b0bb13 JK |
1203 | { |
1204 | linux_ops->to_attach (ops, args, from_tty); | |
1205 | } | |
492d29ea | 1206 | CATCH (ex, RETURN_MASK_ERROR) |
87b0bb13 JK |
1207 | { |
1208 | pid_t pid = parse_pid_to_attach (args); | |
1209 | struct buffer buffer; | |
1210 | char *message, *buffer_s; | |
1211 | ||
1212 | message = xstrdup (ex.message); | |
1213 | make_cleanup (xfree, message); | |
1214 | ||
1215 | buffer_init (&buffer); | |
7ae1a6a6 | 1216 | linux_ptrace_attach_fail_reason (pid, &buffer); |
87b0bb13 JK |
1217 | |
1218 | buffer_grow_str0 (&buffer, ""); | |
1219 | buffer_s = buffer_finish (&buffer); | |
1220 | make_cleanup (xfree, buffer_s); | |
1221 | ||
7ae1a6a6 PA |
1222 | if (*buffer_s != '\0') |
1223 | throw_error (ex.error, "warning: %s\n%s", buffer_s, message); | |
1224 | else | |
1225 | throw_error (ex.error, "%s", message); | |
87b0bb13 | 1226 | } |
492d29ea | 1227 | END_CATCH |
d6b0e80f | 1228 | |
af990527 PA |
1229 | /* The ptrace base target adds the main thread with (pid,0,0) |
1230 | format. Decorate it with lwp info. */ | |
dfd4cc63 LM |
1231 | ptid = ptid_build (ptid_get_pid (inferior_ptid), |
1232 | ptid_get_pid (inferior_ptid), | |
1233 | 0); | |
af990527 PA |
1234 | thread_change_ptid (inferior_ptid, ptid); |
1235 | ||
9f0bdab8 | 1236 | /* Add the initial process as the first LWP to the list. */ |
26cb8b7c | 1237 | lp = add_initial_lwp (ptid); |
a0ef4274 | 1238 | |
4a6ed09b | 1239 | status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->signalled); |
dacc9cb2 PP |
1240 | if (!WIFSTOPPED (status)) |
1241 | { | |
1242 | if (WIFEXITED (status)) | |
1243 | { | |
1244 | int exit_code = WEXITSTATUS (status); | |
1245 | ||
1246 | target_terminal_ours (); | |
1247 | target_mourn_inferior (); | |
1248 | if (exit_code == 0) | |
1249 | error (_("Unable to attach: program exited normally.")); | |
1250 | else | |
1251 | error (_("Unable to attach: program exited with code %d."), | |
1252 | exit_code); | |
1253 | } | |
1254 | else if (WIFSIGNALED (status)) | |
1255 | { | |
2ea28649 | 1256 | enum gdb_signal signo; |
dacc9cb2 PP |
1257 | |
1258 | target_terminal_ours (); | |
1259 | target_mourn_inferior (); | |
1260 | ||
2ea28649 | 1261 | signo = gdb_signal_from_host (WTERMSIG (status)); |
dacc9cb2 PP |
1262 | error (_("Unable to attach: program terminated with signal " |
1263 | "%s, %s."), | |
2ea28649 PA |
1264 | gdb_signal_to_name (signo), |
1265 | gdb_signal_to_string (signo)); | |
dacc9cb2 PP |
1266 | } |
1267 | ||
1268 | internal_error (__FILE__, __LINE__, | |
1269 | _("unexpected status %d for PID %ld"), | |
dfd4cc63 | 1270 | status, (long) ptid_get_lwp (ptid)); |
dacc9cb2 PP |
1271 | } |
1272 | ||
a0ef4274 | 1273 | lp->stopped = 1; |
9f0bdab8 | 1274 | |
a0ef4274 | 1275 | /* Save the wait status to report later. */ |
d6b0e80f | 1276 | lp->resumed = 1; |
a0ef4274 DJ |
1277 | if (debug_linux_nat) |
1278 | fprintf_unfiltered (gdb_stdlog, | |
1279 | "LNA: waitpid %ld, saving status %s\n", | |
dfd4cc63 | 1280 | (long) ptid_get_pid (lp->ptid), status_to_str (status)); |
710151dd | 1281 | |
7feb7d06 PA |
1282 | lp->status = status; |
1283 | ||
8784d563 PA |
1284 | /* We must attach to every LWP. If /proc is mounted, use that to |
1285 | find them now. The inferior may be using raw clone instead of | |
1286 | using pthreads. But even if it is using pthreads, thread_db | |
1287 | walks structures in the inferior's address space to find the list | |
1288 | of threads/LWPs, and those structures may well be corrupted. | |
1289 | Note that once thread_db is loaded, we'll still use it to list | |
1290 | threads and associate pthread info with each LWP. */ | |
1291 | linux_proc_attach_tgid_threads (ptid_get_pid (lp->ptid), | |
1292 | attach_proc_task_lwp_callback); | |
1293 | ||
7feb7d06 | 1294 | if (target_can_async_p ()) |
6a3753b3 | 1295 | target_async (1); |
d6b0e80f AC |
1296 | } |
1297 | ||
a0ef4274 DJ |
1298 | /* Get pending status of LP. */ |
1299 | static int | |
1300 | get_pending_status (struct lwp_info *lp, int *status) | |
1301 | { | |
a493e3e2 | 1302 | enum gdb_signal signo = GDB_SIGNAL_0; |
ca2163eb PA |
1303 | |
1304 | /* If we paused threads momentarily, we may have stored pending | |
1305 | events in lp->status or lp->waitstatus (see stop_wait_callback), | |
1306 | and GDB core hasn't seen any signal for those threads. | |
1307 | Otherwise, the last signal reported to the core is found in the | |
1308 | thread object's stop_signal. | |
1309 | ||
1310 | There's a corner case that isn't handled here at present. Only | |
1311 | if the thread stopped with a TARGET_WAITKIND_STOPPED does | |
1312 | stop_signal make sense as a real signal to pass to the inferior. | |
1313 | Some catchpoint related events, like | |
1314 | TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set | |
a493e3e2 | 1315 | to GDB_SIGNAL_SIGTRAP when the catchpoint triggers. But, |
ca2163eb PA |
1316 | those traps are debug API (ptrace in our case) related and |
1317 | induced; the inferior wouldn't see them if it wasn't being | |
1318 | traced. Hence, we should never pass them to the inferior, even | |
1319 | when set to pass state. Since this corner case isn't handled by | |
1320 | infrun.c when proceeding with a signal, for consistency, neither | |
1321 | do we handle it here (or elsewhere in the file we check for | |
1322 | signal pass state). Normally SIGTRAP isn't set to pass state, so | |
1323 | this is really a corner case. */ | |
1324 | ||
1325 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
a493e3e2 | 1326 | signo = GDB_SIGNAL_0; /* a pending ptrace event, not a real signal. */ |
ca2163eb | 1327 | else if (lp->status) |
2ea28649 | 1328 | signo = gdb_signal_from_host (WSTOPSIG (lp->status)); |
fbea99ea | 1329 | else if (target_is_non_stop_p () && !is_executing (lp->ptid)) |
ca2163eb PA |
1330 | { |
1331 | struct thread_info *tp = find_thread_ptid (lp->ptid); | |
e0881a8e | 1332 | |
72b049d3 PA |
1333 | if (tp->suspend.waitstatus_pending_p) |
1334 | signo = tp->suspend.waitstatus.value.sig; | |
1335 | else | |
1336 | signo = tp->suspend.stop_signal; | |
ca2163eb | 1337 | } |
fbea99ea | 1338 | else if (!target_is_non_stop_p ()) |
a0ef4274 | 1339 | { |
ca2163eb PA |
1340 | struct target_waitstatus last; |
1341 | ptid_t last_ptid; | |
4c28f408 | 1342 | |
ca2163eb | 1343 | get_last_target_status (&last_ptid, &last); |
4c28f408 | 1344 | |
dfd4cc63 | 1345 | if (ptid_get_lwp (lp->ptid) == ptid_get_lwp (last_ptid)) |
ca2163eb | 1346 | { |
e09875d4 | 1347 | struct thread_info *tp = find_thread_ptid (lp->ptid); |
e0881a8e | 1348 | |
16c381f0 | 1349 | signo = tp->suspend.stop_signal; |
4c28f408 | 1350 | } |
ca2163eb | 1351 | } |
4c28f408 | 1352 | |
ca2163eb | 1353 | *status = 0; |
4c28f408 | 1354 | |
a493e3e2 | 1355 | if (signo == GDB_SIGNAL_0) |
ca2163eb PA |
1356 | { |
1357 | if (debug_linux_nat) | |
1358 | fprintf_unfiltered (gdb_stdlog, | |
1359 | "GPT: lwp %s has no pending signal\n", | |
1360 | target_pid_to_str (lp->ptid)); | |
1361 | } | |
1362 | else if (!signal_pass_state (signo)) | |
1363 | { | |
1364 | if (debug_linux_nat) | |
3e43a32a MS |
1365 | fprintf_unfiltered (gdb_stdlog, |
1366 | "GPT: lwp %s had signal %s, " | |
1367 | "but it is in no pass state\n", | |
ca2163eb | 1368 | target_pid_to_str (lp->ptid), |
2ea28649 | 1369 | gdb_signal_to_string (signo)); |
a0ef4274 | 1370 | } |
a0ef4274 | 1371 | else |
4c28f408 | 1372 | { |
2ea28649 | 1373 | *status = W_STOPCODE (gdb_signal_to_host (signo)); |
ca2163eb PA |
1374 | |
1375 | if (debug_linux_nat) | |
1376 | fprintf_unfiltered (gdb_stdlog, | |
1377 | "GPT: lwp %s has pending signal %s\n", | |
1378 | target_pid_to_str (lp->ptid), | |
2ea28649 | 1379 | gdb_signal_to_string (signo)); |
4c28f408 | 1380 | } |
a0ef4274 DJ |
1381 | |
1382 | return 0; | |
1383 | } | |
1384 | ||
d6b0e80f AC |
1385 | static int |
1386 | detach_callback (struct lwp_info *lp, void *data) | |
1387 | { | |
1388 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1389 | ||
1390 | if (debug_linux_nat && lp->status) | |
1391 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1392 | strsignal (WSTOPSIG (lp->status)), | |
1393 | target_pid_to_str (lp->ptid)); | |
1394 | ||
a0ef4274 DJ |
1395 | /* If there is a pending SIGSTOP, get rid of it. */ |
1396 | if (lp->signalled) | |
d6b0e80f | 1397 | { |
d6b0e80f AC |
1398 | if (debug_linux_nat) |
1399 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1400 | "DC: Sending SIGCONT to %s\n", |
1401 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1402 | |
dfd4cc63 | 1403 | kill_lwp (ptid_get_lwp (lp->ptid), SIGCONT); |
d6b0e80f | 1404 | lp->signalled = 0; |
d6b0e80f AC |
1405 | } |
1406 | ||
1407 | /* We don't actually detach from the LWP that has an id equal to the | |
1408 | overall process id just yet. */ | |
dfd4cc63 | 1409 | if (ptid_get_lwp (lp->ptid) != ptid_get_pid (lp->ptid)) |
d6b0e80f | 1410 | { |
a0ef4274 DJ |
1411 | int status = 0; |
1412 | ||
1413 | /* Pass on any pending signal for this LWP. */ | |
1414 | get_pending_status (lp, &status); | |
1415 | ||
7b50312a PA |
1416 | if (linux_nat_prepare_to_resume != NULL) |
1417 | linux_nat_prepare_to_resume (lp); | |
d6b0e80f | 1418 | errno = 0; |
dfd4cc63 | 1419 | if (ptrace (PTRACE_DETACH, ptid_get_lwp (lp->ptid), 0, |
a0ef4274 | 1420 | WSTOPSIG (status)) < 0) |
8a3fe4f8 | 1421 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1422 | safe_strerror (errno)); |
1423 | ||
1424 | if (debug_linux_nat) | |
1425 | fprintf_unfiltered (gdb_stdlog, | |
1426 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1427 | target_pid_to_str (lp->ptid), | |
7feb7d06 | 1428 | strsignal (WSTOPSIG (status))); |
d6b0e80f AC |
1429 | |
1430 | delete_lwp (lp->ptid); | |
1431 | } | |
1432 | ||
1433 | return 0; | |
1434 | } | |
1435 | ||
1436 | static void | |
52554a0e | 1437 | linux_nat_detach (struct target_ops *ops, const char *args, int from_tty) |
d6b0e80f | 1438 | { |
b84876c2 | 1439 | int pid; |
a0ef4274 | 1440 | int status; |
d90e17a7 PA |
1441 | struct lwp_info *main_lwp; |
1442 | ||
dfd4cc63 | 1443 | pid = ptid_get_pid (inferior_ptid); |
a0ef4274 | 1444 | |
ae5e0686 MK |
1445 | /* Don't unregister from the event loop, as there may be other |
1446 | inferiors running. */ | |
b84876c2 | 1447 | |
4c28f408 PA |
1448 | /* Stop all threads before detaching. ptrace requires that the |
1449 | thread is stopped to sucessfully detach. */ | |
d90e17a7 | 1450 | iterate_over_lwps (pid_to_ptid (pid), stop_callback, NULL); |
4c28f408 PA |
1451 | /* ... and wait until all of them have reported back that |
1452 | they're no longer running. */ | |
d90e17a7 | 1453 | iterate_over_lwps (pid_to_ptid (pid), stop_wait_callback, NULL); |
4c28f408 | 1454 | |
d90e17a7 | 1455 | iterate_over_lwps (pid_to_ptid (pid), detach_callback, NULL); |
d6b0e80f AC |
1456 | |
1457 | /* Only the initial process should be left right now. */ | |
dfd4cc63 | 1458 | gdb_assert (num_lwps (ptid_get_pid (inferior_ptid)) == 1); |
d90e17a7 PA |
1459 | |
1460 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
d6b0e80f | 1461 | |
a0ef4274 DJ |
1462 | /* Pass on any pending signal for the last LWP. */ |
1463 | if ((args == NULL || *args == '\0') | |
d90e17a7 | 1464 | && get_pending_status (main_lwp, &status) != -1 |
a0ef4274 DJ |
1465 | && WIFSTOPPED (status)) |
1466 | { | |
52554a0e TT |
1467 | char *tem; |
1468 | ||
a0ef4274 DJ |
1469 | /* Put the signal number in ARGS so that inf_ptrace_detach will |
1470 | pass it along with PTRACE_DETACH. */ | |
224c3ddb | 1471 | tem = (char *) alloca (8); |
cde33bf1 | 1472 | xsnprintf (tem, 8, "%d", (int) WSTOPSIG (status)); |
52554a0e | 1473 | args = tem; |
ddabfc73 TT |
1474 | if (debug_linux_nat) |
1475 | fprintf_unfiltered (gdb_stdlog, | |
1476 | "LND: Sending signal %s to %s\n", | |
1477 | args, | |
1478 | target_pid_to_str (main_lwp->ptid)); | |
a0ef4274 DJ |
1479 | } |
1480 | ||
7b50312a PA |
1481 | if (linux_nat_prepare_to_resume != NULL) |
1482 | linux_nat_prepare_to_resume (main_lwp); | |
d90e17a7 | 1483 | delete_lwp (main_lwp->ptid); |
b84876c2 | 1484 | |
7a7d3353 PA |
1485 | if (forks_exist_p ()) |
1486 | { | |
1487 | /* Multi-fork case. The current inferior_ptid is being detached | |
1488 | from, but there are other viable forks to debug. Detach from | |
1489 | the current fork, and context-switch to the first | |
1490 | available. */ | |
1491 | linux_fork_detach (args, from_tty); | |
7a7d3353 PA |
1492 | } |
1493 | else | |
1494 | linux_ops->to_detach (ops, args, from_tty); | |
d6b0e80f AC |
1495 | } |
1496 | ||
8a99810d PA |
1497 | /* Resume execution of the inferior process. If STEP is nonzero, |
1498 | single-step it. If SIGNAL is nonzero, give it that signal. */ | |
1499 | ||
1500 | static void | |
23f238d3 PA |
1501 | linux_resume_one_lwp_throw (struct lwp_info *lp, int step, |
1502 | enum gdb_signal signo) | |
8a99810d | 1503 | { |
8a99810d | 1504 | lp->step = step; |
9c02b525 PA |
1505 | |
1506 | /* stop_pc doubles as the PC the LWP had when it was last resumed. | |
1507 | We only presently need that if the LWP is stepped though (to | |
1508 | handle the case of stepping a breakpoint instruction). */ | |
1509 | if (step) | |
1510 | { | |
1511 | struct regcache *regcache = get_thread_regcache (lp->ptid); | |
1512 | ||
1513 | lp->stop_pc = regcache_read_pc (regcache); | |
1514 | } | |
1515 | else | |
1516 | lp->stop_pc = 0; | |
1517 | ||
8a99810d PA |
1518 | if (linux_nat_prepare_to_resume != NULL) |
1519 | linux_nat_prepare_to_resume (lp); | |
90ad5e1d | 1520 | linux_ops->to_resume (linux_ops, lp->ptid, step, signo); |
23f238d3 PA |
1521 | |
1522 | /* Successfully resumed. Clear state that no longer makes sense, | |
1523 | and mark the LWP as running. Must not do this before resuming | |
1524 | otherwise if that fails other code will be confused. E.g., we'd | |
1525 | later try to stop the LWP and hang forever waiting for a stop | |
1526 | status. Note that we must not throw after this is cleared, | |
1527 | otherwise handle_zombie_lwp_error would get confused. */ | |
8a99810d | 1528 | lp->stopped = 0; |
1ad3de98 | 1529 | lp->core = -1; |
23f238d3 | 1530 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8a99810d PA |
1531 | registers_changed_ptid (lp->ptid); |
1532 | } | |
1533 | ||
23f238d3 PA |
1534 | /* Called when we try to resume a stopped LWP and that errors out. If |
1535 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
1536 | or about to become), discard the error, clear any pending status | |
1537 | the LWP may have, and return true (we'll collect the exit status | |
1538 | soon enough). Otherwise, return false. */ | |
1539 | ||
1540 | static int | |
1541 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
1542 | { | |
1543 | /* If we get an error after resuming the LWP successfully, we'd | |
1544 | confuse !T state for the LWP being gone. */ | |
1545 | gdb_assert (lp->stopped); | |
1546 | ||
1547 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
1548 | because even if ptrace failed with ESRCH, the tracee may be "not | |
1549 | yet fully dead", but already refusing ptrace requests. In that | |
1550 | case the tracee has 'R (Running)' state for a little bit | |
1551 | (observed in Linux 3.18). See also the note on ESRCH in the | |
1552 | ptrace(2) man page. Instead, check whether the LWP has any state | |
1553 | other than ptrace-stopped. */ | |
1554 | ||
1555 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
1556 | if (linux_proc_pid_is_trace_stopped_nowarn (ptid_get_lwp (lp->ptid)) == 0) | |
1557 | { | |
1558 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
1559 | lp->status = 0; | |
1560 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
1561 | return 1; | |
1562 | } | |
1563 | return 0; | |
1564 | } | |
1565 | ||
1566 | /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP | |
1567 | disappears while we try to resume it. */ | |
1568 | ||
1569 | static void | |
1570 | linux_resume_one_lwp (struct lwp_info *lp, int step, enum gdb_signal signo) | |
1571 | { | |
1572 | TRY | |
1573 | { | |
1574 | linux_resume_one_lwp_throw (lp, step, signo); | |
1575 | } | |
1576 | CATCH (ex, RETURN_MASK_ERROR) | |
1577 | { | |
1578 | if (!check_ptrace_stopped_lwp_gone (lp)) | |
1579 | throw_exception (ex); | |
1580 | } | |
1581 | END_CATCH | |
1582 | } | |
1583 | ||
d6b0e80f AC |
1584 | /* Resume LP. */ |
1585 | ||
25289eb2 | 1586 | static void |
e5ef252a | 1587 | resume_lwp (struct lwp_info *lp, int step, enum gdb_signal signo) |
d6b0e80f | 1588 | { |
25289eb2 | 1589 | if (lp->stopped) |
6c95b8df | 1590 | { |
c9657e70 | 1591 | struct inferior *inf = find_inferior_ptid (lp->ptid); |
25289eb2 PA |
1592 | |
1593 | if (inf->vfork_child != NULL) | |
1594 | { | |
1595 | if (debug_linux_nat) | |
1596 | fprintf_unfiltered (gdb_stdlog, | |
1597 | "RC: Not resuming %s (vfork parent)\n", | |
1598 | target_pid_to_str (lp->ptid)); | |
1599 | } | |
8a99810d | 1600 | else if (!lwp_status_pending_p (lp)) |
25289eb2 PA |
1601 | { |
1602 | if (debug_linux_nat) | |
1603 | fprintf_unfiltered (gdb_stdlog, | |
e5ef252a PA |
1604 | "RC: Resuming sibling %s, %s, %s\n", |
1605 | target_pid_to_str (lp->ptid), | |
1606 | (signo != GDB_SIGNAL_0 | |
1607 | ? strsignal (gdb_signal_to_host (signo)) | |
1608 | : "0"), | |
1609 | step ? "step" : "resume"); | |
25289eb2 | 1610 | |
8a99810d | 1611 | linux_resume_one_lwp (lp, step, signo); |
25289eb2 PA |
1612 | } |
1613 | else | |
1614 | { | |
1615 | if (debug_linux_nat) | |
1616 | fprintf_unfiltered (gdb_stdlog, | |
1617 | "RC: Not resuming sibling %s (has pending)\n", | |
1618 | target_pid_to_str (lp->ptid)); | |
1619 | } | |
6c95b8df | 1620 | } |
25289eb2 | 1621 | else |
d6b0e80f | 1622 | { |
d90e17a7 PA |
1623 | if (debug_linux_nat) |
1624 | fprintf_unfiltered (gdb_stdlog, | |
25289eb2 | 1625 | "RC: Not resuming sibling %s (not stopped)\n", |
d6b0e80f | 1626 | target_pid_to_str (lp->ptid)); |
d6b0e80f | 1627 | } |
25289eb2 | 1628 | } |
d6b0e80f | 1629 | |
8817a6f2 PA |
1630 | /* Callback for iterate_over_lwps. If LWP is EXCEPT, do nothing. |
1631 | Resume LWP with the last stop signal, if it is in pass state. */ | |
e5ef252a | 1632 | |
25289eb2 | 1633 | static int |
8817a6f2 | 1634 | linux_nat_resume_callback (struct lwp_info *lp, void *except) |
25289eb2 | 1635 | { |
e5ef252a PA |
1636 | enum gdb_signal signo = GDB_SIGNAL_0; |
1637 | ||
8817a6f2 PA |
1638 | if (lp == except) |
1639 | return 0; | |
1640 | ||
e5ef252a PA |
1641 | if (lp->stopped) |
1642 | { | |
1643 | struct thread_info *thread; | |
1644 | ||
1645 | thread = find_thread_ptid (lp->ptid); | |
1646 | if (thread != NULL) | |
1647 | { | |
70509625 | 1648 | signo = thread->suspend.stop_signal; |
e5ef252a PA |
1649 | thread->suspend.stop_signal = GDB_SIGNAL_0; |
1650 | } | |
1651 | } | |
1652 | ||
1653 | resume_lwp (lp, 0, signo); | |
d6b0e80f AC |
1654 | return 0; |
1655 | } | |
1656 | ||
1657 | static int | |
1658 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1659 | { | |
1660 | lp->resumed = 0; | |
25289eb2 | 1661 | lp->last_resume_kind = resume_stop; |
d6b0e80f AC |
1662 | return 0; |
1663 | } | |
1664 | ||
1665 | static int | |
1666 | resume_set_callback (struct lwp_info *lp, void *data) | |
1667 | { | |
1668 | lp->resumed = 1; | |
25289eb2 | 1669 | lp->last_resume_kind = resume_continue; |
d6b0e80f AC |
1670 | return 0; |
1671 | } | |
1672 | ||
1673 | static void | |
28439f5e | 1674 | linux_nat_resume (struct target_ops *ops, |
2ea28649 | 1675 | ptid_t ptid, int step, enum gdb_signal signo) |
d6b0e80f AC |
1676 | { |
1677 | struct lwp_info *lp; | |
d90e17a7 | 1678 | int resume_many; |
d6b0e80f | 1679 | |
76f50ad1 DJ |
1680 | if (debug_linux_nat) |
1681 | fprintf_unfiltered (gdb_stdlog, | |
1682 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1683 | step ? "step" : "resume", | |
1684 | target_pid_to_str (ptid), | |
a493e3e2 | 1685 | (signo != GDB_SIGNAL_0 |
2ea28649 | 1686 | ? strsignal (gdb_signal_to_host (signo)) : "0"), |
76f50ad1 DJ |
1687 | target_pid_to_str (inferior_ptid)); |
1688 | ||
d6b0e80f | 1689 | /* A specific PTID means `step only this process id'. */ |
d90e17a7 PA |
1690 | resume_many = (ptid_equal (minus_one_ptid, ptid) |
1691 | || ptid_is_pid (ptid)); | |
4c28f408 | 1692 | |
e3e9f5a2 PA |
1693 | /* Mark the lwps we're resuming as resumed. */ |
1694 | iterate_over_lwps (ptid, resume_set_callback, NULL); | |
d6b0e80f | 1695 | |
d90e17a7 PA |
1696 | /* See if it's the current inferior that should be handled |
1697 | specially. */ | |
1698 | if (resume_many) | |
1699 | lp = find_lwp_pid (inferior_ptid); | |
1700 | else | |
1701 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1702 | gdb_assert (lp != NULL); |
d6b0e80f | 1703 | |
9f0bdab8 | 1704 | /* Remember if we're stepping. */ |
25289eb2 | 1705 | lp->last_resume_kind = step ? resume_step : resume_continue; |
d6b0e80f | 1706 | |
9f0bdab8 DJ |
1707 | /* If we have a pending wait status for this thread, there is no |
1708 | point in resuming the process. But first make sure that | |
1709 | linux_nat_wait won't preemptively handle the event - we | |
1710 | should never take this short-circuit if we are going to | |
1711 | leave LP running, since we have skipped resuming all the | |
1712 | other threads. This bit of code needs to be synchronized | |
1713 | with linux_nat_wait. */ | |
76f50ad1 | 1714 | |
9f0bdab8 DJ |
1715 | if (lp->status && WIFSTOPPED (lp->status)) |
1716 | { | |
2455069d UW |
1717 | if (!lp->step |
1718 | && WSTOPSIG (lp->status) | |
1719 | && sigismember (&pass_mask, WSTOPSIG (lp->status))) | |
d6b0e80f | 1720 | { |
9f0bdab8 DJ |
1721 | if (debug_linux_nat) |
1722 | fprintf_unfiltered (gdb_stdlog, | |
1723 | "LLR: Not short circuiting for ignored " | |
1724 | "status 0x%x\n", lp->status); | |
1725 | ||
d6b0e80f AC |
1726 | /* FIXME: What should we do if we are supposed to continue |
1727 | this thread with a signal? */ | |
a493e3e2 | 1728 | gdb_assert (signo == GDB_SIGNAL_0); |
2ea28649 | 1729 | signo = gdb_signal_from_host (WSTOPSIG (lp->status)); |
9f0bdab8 DJ |
1730 | lp->status = 0; |
1731 | } | |
1732 | } | |
76f50ad1 | 1733 | |
8a99810d | 1734 | if (lwp_status_pending_p (lp)) |
9f0bdab8 DJ |
1735 | { |
1736 | /* FIXME: What should we do if we are supposed to continue | |
1737 | this thread with a signal? */ | |
a493e3e2 | 1738 | gdb_assert (signo == GDB_SIGNAL_0); |
76f50ad1 | 1739 | |
9f0bdab8 DJ |
1740 | if (debug_linux_nat) |
1741 | fprintf_unfiltered (gdb_stdlog, | |
1742 | "LLR: Short circuiting for status 0x%x\n", | |
1743 | lp->status); | |
d6b0e80f | 1744 | |
7feb7d06 PA |
1745 | if (target_can_async_p ()) |
1746 | { | |
6a3753b3 | 1747 | target_async (1); |
7feb7d06 PA |
1748 | /* Tell the event loop we have something to process. */ |
1749 | async_file_mark (); | |
1750 | } | |
9f0bdab8 | 1751 | return; |
d6b0e80f AC |
1752 | } |
1753 | ||
d90e17a7 | 1754 | if (resume_many) |
8817a6f2 | 1755 | iterate_over_lwps (ptid, linux_nat_resume_callback, lp); |
d90e17a7 | 1756 | |
d6b0e80f AC |
1757 | if (debug_linux_nat) |
1758 | fprintf_unfiltered (gdb_stdlog, | |
1759 | "LLR: %s %s, %s (resume event thread)\n", | |
1760 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2bf6fb9d | 1761 | target_pid_to_str (lp->ptid), |
a493e3e2 | 1762 | (signo != GDB_SIGNAL_0 |
2ea28649 | 1763 | ? strsignal (gdb_signal_to_host (signo)) : "0")); |
b84876c2 | 1764 | |
2bf6fb9d PA |
1765 | linux_resume_one_lwp (lp, step, signo); |
1766 | ||
b84876c2 | 1767 | if (target_can_async_p ()) |
6a3753b3 | 1768 | target_async (1); |
d6b0e80f AC |
1769 | } |
1770 | ||
c5f62d5f | 1771 | /* Send a signal to an LWP. */ |
d6b0e80f AC |
1772 | |
1773 | static int | |
1774 | kill_lwp (int lwpid, int signo) | |
1775 | { | |
4a6ed09b | 1776 | int ret; |
d6b0e80f | 1777 | |
4a6ed09b PA |
1778 | errno = 0; |
1779 | ret = syscall (__NR_tkill, lwpid, signo); | |
1780 | if (errno == ENOSYS) | |
1781 | { | |
1782 | /* If tkill fails, then we are not using nptl threads, a | |
1783 | configuration we no longer support. */ | |
1784 | perror_with_name (("tkill")); | |
1785 | } | |
1786 | return ret; | |
d6b0e80f AC |
1787 | } |
1788 | ||
ca2163eb PA |
1789 | /* Handle a GNU/Linux syscall trap wait response. If we see a syscall |
1790 | event, check if the core is interested in it: if not, ignore the | |
1791 | event, and keep waiting; otherwise, we need to toggle the LWP's | |
1792 | syscall entry/exit status, since the ptrace event itself doesn't | |
1793 | indicate it, and report the trap to higher layers. */ | |
1794 | ||
1795 | static int | |
1796 | linux_handle_syscall_trap (struct lwp_info *lp, int stopping) | |
1797 | { | |
1798 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
1799 | struct gdbarch *gdbarch = target_thread_architecture (lp->ptid); | |
1800 | int syscall_number = (int) gdbarch_get_syscall_number (gdbarch, lp->ptid); | |
1801 | ||
1802 | if (stopping) | |
1803 | { | |
1804 | /* If we're stopping threads, there's a SIGSTOP pending, which | |
1805 | makes it so that the LWP reports an immediate syscall return, | |
1806 | followed by the SIGSTOP. Skip seeing that "return" using | |
1807 | PTRACE_CONT directly, and let stop_wait_callback collect the | |
1808 | SIGSTOP. Later when the thread is resumed, a new syscall | |
1809 | entry event. If we didn't do this (and returned 0), we'd | |
1810 | leave a syscall entry pending, and our caller, by using | |
1811 | PTRACE_CONT to collect the SIGSTOP, skips the syscall return | |
1812 | itself. Later, when the user re-resumes this LWP, we'd see | |
1813 | another syscall entry event and we'd mistake it for a return. | |
1814 | ||
1815 | If stop_wait_callback didn't force the SIGSTOP out of the LWP | |
1816 | (leaving immediately with LWP->signalled set, without issuing | |
1817 | a PTRACE_CONT), it would still be problematic to leave this | |
1818 | syscall enter pending, as later when the thread is resumed, | |
1819 | it would then see the same syscall exit mentioned above, | |
1820 | followed by the delayed SIGSTOP, while the syscall didn't | |
1821 | actually get to execute. It seems it would be even more | |
1822 | confusing to the user. */ | |
1823 | ||
1824 | if (debug_linux_nat) | |
1825 | fprintf_unfiltered (gdb_stdlog, | |
1826 | "LHST: ignoring syscall %d " | |
1827 | "for LWP %ld (stopping threads), " | |
1828 | "resuming with PTRACE_CONT for SIGSTOP\n", | |
1829 | syscall_number, | |
dfd4cc63 | 1830 | ptid_get_lwp (lp->ptid)); |
ca2163eb PA |
1831 | |
1832 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
dfd4cc63 | 1833 | ptrace (PTRACE_CONT, ptid_get_lwp (lp->ptid), 0, 0); |
8817a6f2 | 1834 | lp->stopped = 0; |
ca2163eb PA |
1835 | return 1; |
1836 | } | |
1837 | ||
bfd09d20 JS |
1838 | /* Always update the entry/return state, even if this particular |
1839 | syscall isn't interesting to the core now. In async mode, | |
1840 | the user could install a new catchpoint for this syscall | |
1841 | between syscall enter/return, and we'll need to know to | |
1842 | report a syscall return if that happens. */ | |
1843 | lp->syscall_state = (lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
1844 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
1845 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
1846 | ||
ca2163eb PA |
1847 | if (catch_syscall_enabled ()) |
1848 | { | |
ca2163eb PA |
1849 | if (catching_syscall_number (syscall_number)) |
1850 | { | |
1851 | /* Alright, an event to report. */ | |
1852 | ourstatus->kind = lp->syscall_state; | |
1853 | ourstatus->value.syscall_number = syscall_number; | |
1854 | ||
1855 | if (debug_linux_nat) | |
1856 | fprintf_unfiltered (gdb_stdlog, | |
1857 | "LHST: stopping for %s of syscall %d" | |
1858 | " for LWP %ld\n", | |
3e43a32a MS |
1859 | lp->syscall_state |
1860 | == TARGET_WAITKIND_SYSCALL_ENTRY | |
ca2163eb PA |
1861 | ? "entry" : "return", |
1862 | syscall_number, | |
dfd4cc63 | 1863 | ptid_get_lwp (lp->ptid)); |
ca2163eb PA |
1864 | return 0; |
1865 | } | |
1866 | ||
1867 | if (debug_linux_nat) | |
1868 | fprintf_unfiltered (gdb_stdlog, | |
1869 | "LHST: ignoring %s of syscall %d " | |
1870 | "for LWP %ld\n", | |
1871 | lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
1872 | ? "entry" : "return", | |
1873 | syscall_number, | |
dfd4cc63 | 1874 | ptid_get_lwp (lp->ptid)); |
ca2163eb PA |
1875 | } |
1876 | else | |
1877 | { | |
1878 | /* If we had been syscall tracing, and hence used PT_SYSCALL | |
1879 | before on this LWP, it could happen that the user removes all | |
1880 | syscall catchpoints before we get to process this event. | |
1881 | There are two noteworthy issues here: | |
1882 | ||
1883 | - When stopped at a syscall entry event, resuming with | |
1884 | PT_STEP still resumes executing the syscall and reports a | |
1885 | syscall return. | |
1886 | ||
1887 | - Only PT_SYSCALL catches syscall enters. If we last | |
1888 | single-stepped this thread, then this event can't be a | |
1889 | syscall enter. If we last single-stepped this thread, this | |
1890 | has to be a syscall exit. | |
1891 | ||
1892 | The points above mean that the next resume, be it PT_STEP or | |
1893 | PT_CONTINUE, can not trigger a syscall trace event. */ | |
1894 | if (debug_linux_nat) | |
1895 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
1896 | "LHST: caught syscall event " |
1897 | "with no syscall catchpoints." | |
ca2163eb PA |
1898 | " %d for LWP %ld, ignoring\n", |
1899 | syscall_number, | |
dfd4cc63 | 1900 | ptid_get_lwp (lp->ptid)); |
ca2163eb PA |
1901 | lp->syscall_state = TARGET_WAITKIND_IGNORE; |
1902 | } | |
1903 | ||
1904 | /* The core isn't interested in this event. For efficiency, avoid | |
1905 | stopping all threads only to have the core resume them all again. | |
1906 | Since we're not stopping threads, if we're still syscall tracing | |
1907 | and not stepping, we can't use PTRACE_CONT here, as we'd miss any | |
1908 | subsequent syscall. Simply resume using the inf-ptrace layer, | |
1909 | which knows when to use PT_SYSCALL or PT_CONTINUE. */ | |
1910 | ||
8a99810d | 1911 | linux_resume_one_lwp (lp, lp->step, GDB_SIGNAL_0); |
ca2163eb PA |
1912 | return 1; |
1913 | } | |
1914 | ||
3d799a95 DJ |
1915 | /* Handle a GNU/Linux extended wait response. If we see a clone |
1916 | event, we need to add the new LWP to our list (and not report the | |
1917 | trap to higher layers). This function returns non-zero if the | |
1918 | event should be ignored and we should wait again. If STOPPING is | |
1919 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
1920 | |
1921 | static int | |
4dd63d48 | 1922 | linux_handle_extended_wait (struct lwp_info *lp, int status) |
d6b0e80f | 1923 | { |
dfd4cc63 | 1924 | int pid = ptid_get_lwp (lp->ptid); |
3d799a95 | 1925 | struct target_waitstatus *ourstatus = &lp->waitstatus; |
89a5711c | 1926 | int event = linux_ptrace_get_extended_event (status); |
d6b0e80f | 1927 | |
bfd09d20 JS |
1928 | /* All extended events we currently use are mid-syscall. Only |
1929 | PTRACE_EVENT_STOP is delivered more like a signal-stop, but | |
1930 | you have to be using PTRACE_SEIZE to get that. */ | |
1931 | lp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
1932 | ||
3d799a95 DJ |
1933 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
1934 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 1935 | { |
3d799a95 DJ |
1936 | unsigned long new_pid; |
1937 | int ret; | |
1938 | ||
1939 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 1940 | |
3d799a95 DJ |
1941 | /* If we haven't already seen the new PID stop, wait for it now. */ |
1942 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
1943 | { | |
1944 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
1945 | hits the SIGSTOP, but we're already attached. */ | |
4a6ed09b | 1946 | ret = my_waitpid (new_pid, &status, __WALL); |
3d799a95 DJ |
1947 | if (ret == -1) |
1948 | perror_with_name (_("waiting for new child")); | |
1949 | else if (ret != new_pid) | |
1950 | internal_error (__FILE__, __LINE__, | |
1951 | _("wait returned unexpected PID %d"), ret); | |
1952 | else if (!WIFSTOPPED (status)) | |
1953 | internal_error (__FILE__, __LINE__, | |
1954 | _("wait returned unexpected status 0x%x"), status); | |
1955 | } | |
1956 | ||
3a3e9ee3 | 1957 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 | 1958 | |
26cb8b7c PA |
1959 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
1960 | { | |
1961 | /* The arch-specific native code may need to know about new | |
1962 | forks even if those end up never mapped to an | |
1963 | inferior. */ | |
1964 | if (linux_nat_new_fork != NULL) | |
1965 | linux_nat_new_fork (lp, new_pid); | |
1966 | } | |
1967 | ||
2277426b | 1968 | if (event == PTRACE_EVENT_FORK |
dfd4cc63 | 1969 | && linux_fork_checkpointing_p (ptid_get_pid (lp->ptid))) |
2277426b | 1970 | { |
2277426b PA |
1971 | /* Handle checkpointing by linux-fork.c here as a special |
1972 | case. We don't want the follow-fork-mode or 'catch fork' | |
1973 | to interfere with this. */ | |
1974 | ||
1975 | /* This won't actually modify the breakpoint list, but will | |
1976 | physically remove the breakpoints from the child. */ | |
d80ee84f | 1977 | detach_breakpoints (ptid_build (new_pid, new_pid, 0)); |
2277426b PA |
1978 | |
1979 | /* Retain child fork in ptrace (stopped) state. */ | |
14571dad MS |
1980 | if (!find_fork_pid (new_pid)) |
1981 | add_fork (new_pid); | |
2277426b PA |
1982 | |
1983 | /* Report as spurious, so that infrun doesn't want to follow | |
1984 | this fork. We're actually doing an infcall in | |
1985 | linux-fork.c. */ | |
1986 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
2277426b PA |
1987 | |
1988 | /* Report the stop to the core. */ | |
1989 | return 0; | |
1990 | } | |
1991 | ||
3d799a95 DJ |
1992 | if (event == PTRACE_EVENT_FORK) |
1993 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
1994 | else if (event == PTRACE_EVENT_VFORK) | |
1995 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
4dd63d48 | 1996 | else if (event == PTRACE_EVENT_CLONE) |
3d799a95 | 1997 | { |
78768c4a JK |
1998 | struct lwp_info *new_lp; |
1999 | ||
3d799a95 | 2000 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
78768c4a | 2001 | |
3c4d7e12 PA |
2002 | if (debug_linux_nat) |
2003 | fprintf_unfiltered (gdb_stdlog, | |
2004 | "LHEW: Got clone event " | |
2005 | "from LWP %d, new child is LWP %ld\n", | |
2006 | pid, new_pid); | |
2007 | ||
dfd4cc63 | 2008 | new_lp = add_lwp (ptid_build (ptid_get_pid (lp->ptid), new_pid, 0)); |
4c28f408 | 2009 | new_lp->stopped = 1; |
4dd63d48 | 2010 | new_lp->resumed = 1; |
d6b0e80f | 2011 | |
2db9a427 PA |
2012 | /* If the thread_db layer is active, let it record the user |
2013 | level thread id and status, and add the thread to GDB's | |
2014 | list. */ | |
2015 | if (!thread_db_notice_clone (lp->ptid, new_lp->ptid)) | |
3d799a95 | 2016 | { |
2db9a427 PA |
2017 | /* The process is not using thread_db. Add the LWP to |
2018 | GDB's list. */ | |
2019 | target_post_attach (ptid_get_lwp (new_lp->ptid)); | |
2020 | add_thread (new_lp->ptid); | |
2021 | } | |
4c28f408 | 2022 | |
2ee52aa4 | 2023 | /* Even if we're stopping the thread for some reason |
4dd63d48 PA |
2024 | internal to this module, from the perspective of infrun |
2025 | and the user/frontend, this new thread is running until | |
2026 | it next reports a stop. */ | |
2ee52aa4 | 2027 | set_running (new_lp->ptid, 1); |
4dd63d48 | 2028 | set_executing (new_lp->ptid, 1); |
4c28f408 | 2029 | |
4dd63d48 | 2030 | if (WSTOPSIG (status) != SIGSTOP) |
79395f92 | 2031 | { |
4dd63d48 PA |
2032 | /* This can happen if someone starts sending signals to |
2033 | the new thread before it gets a chance to run, which | |
2034 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
2035 | This is an unlikely case, and harder to handle for | |
2036 | fork / vfork than for clone, so we do not try - but | |
2037 | we handle it for clone events here. */ | |
2038 | ||
2039 | new_lp->signalled = 1; | |
2040 | ||
79395f92 PA |
2041 | /* We created NEW_LP so it cannot yet contain STATUS. */ |
2042 | gdb_assert (new_lp->status == 0); | |
2043 | ||
2044 | /* Save the wait status to report later. */ | |
2045 | if (debug_linux_nat) | |
2046 | fprintf_unfiltered (gdb_stdlog, | |
2047 | "LHEW: waitpid of new LWP %ld, " | |
2048 | "saving status %s\n", | |
dfd4cc63 | 2049 | (long) ptid_get_lwp (new_lp->ptid), |
79395f92 PA |
2050 | status_to_str (status)); |
2051 | new_lp->status = status; | |
2052 | } | |
aa01bd36 PA |
2053 | else if (report_thread_events) |
2054 | { | |
2055 | new_lp->waitstatus.kind = TARGET_WAITKIND_THREAD_CREATED; | |
2056 | new_lp->status = status; | |
2057 | } | |
79395f92 | 2058 | |
3d799a95 DJ |
2059 | return 1; |
2060 | } | |
2061 | ||
2062 | return 0; | |
d6b0e80f AC |
2063 | } |
2064 | ||
3d799a95 DJ |
2065 | if (event == PTRACE_EVENT_EXEC) |
2066 | { | |
a75724bc PA |
2067 | if (debug_linux_nat) |
2068 | fprintf_unfiltered (gdb_stdlog, | |
2069 | "LHEW: Got exec event from LWP %ld\n", | |
dfd4cc63 | 2070 | ptid_get_lwp (lp->ptid)); |
a75724bc | 2071 | |
3d799a95 DJ |
2072 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
2073 | ourstatus->value.execd_pathname | |
8dd27370 | 2074 | = xstrdup (linux_child_pid_to_exec_file (NULL, pid)); |
3d799a95 | 2075 | |
8af756ef PA |
2076 | /* The thread that execed must have been resumed, but, when a |
2077 | thread execs, it changes its tid to the tgid, and the old | |
2078 | tgid thread might have not been resumed. */ | |
2079 | lp->resumed = 1; | |
6c95b8df PA |
2080 | return 0; |
2081 | } | |
2082 | ||
2083 | if (event == PTRACE_EVENT_VFORK_DONE) | |
2084 | { | |
2085 | if (current_inferior ()->waiting_for_vfork_done) | |
3d799a95 | 2086 | { |
6c95b8df | 2087 | if (debug_linux_nat) |
3e43a32a MS |
2088 | fprintf_unfiltered (gdb_stdlog, |
2089 | "LHEW: Got expected PTRACE_EVENT_" | |
2090 | "VFORK_DONE from LWP %ld: stopping\n", | |
dfd4cc63 | 2091 | ptid_get_lwp (lp->ptid)); |
3d799a95 | 2092 | |
6c95b8df PA |
2093 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; |
2094 | return 0; | |
3d799a95 DJ |
2095 | } |
2096 | ||
6c95b8df | 2097 | if (debug_linux_nat) |
3e43a32a MS |
2098 | fprintf_unfiltered (gdb_stdlog, |
2099 | "LHEW: Got PTRACE_EVENT_VFORK_DONE " | |
20ba1ce6 | 2100 | "from LWP %ld: ignoring\n", |
dfd4cc63 | 2101 | ptid_get_lwp (lp->ptid)); |
6c95b8df | 2102 | return 1; |
3d799a95 DJ |
2103 | } |
2104 | ||
2105 | internal_error (__FILE__, __LINE__, | |
2106 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
2107 | } |
2108 | ||
2109 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has | |
2110 | exited. */ | |
2111 | ||
2112 | static int | |
2113 | wait_lwp (struct lwp_info *lp) | |
2114 | { | |
2115 | pid_t pid; | |
432b4d03 | 2116 | int status = 0; |
d6b0e80f | 2117 | int thread_dead = 0; |
432b4d03 | 2118 | sigset_t prev_mask; |
d6b0e80f AC |
2119 | |
2120 | gdb_assert (!lp->stopped); | |
2121 | gdb_assert (lp->status == 0); | |
2122 | ||
432b4d03 JK |
2123 | /* Make sure SIGCHLD is blocked for sigsuspend avoiding a race below. */ |
2124 | block_child_signals (&prev_mask); | |
2125 | ||
2126 | for (;;) | |
d6b0e80f | 2127 | { |
4a6ed09b | 2128 | pid = my_waitpid (ptid_get_lwp (lp->ptid), &status, __WALL | WNOHANG); |
a9f4bb21 PA |
2129 | if (pid == -1 && errno == ECHILD) |
2130 | { | |
2131 | /* The thread has previously exited. We need to delete it | |
4a6ed09b PA |
2132 | now because if this was a non-leader thread execing, we |
2133 | won't get an exit event. See comments on exec events at | |
2134 | the top of the file. */ | |
a9f4bb21 PA |
2135 | thread_dead = 1; |
2136 | if (debug_linux_nat) | |
2137 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
2138 | target_pid_to_str (lp->ptid)); | |
2139 | } | |
432b4d03 JK |
2140 | if (pid != 0) |
2141 | break; | |
2142 | ||
2143 | /* Bugs 10970, 12702. | |
2144 | Thread group leader may have exited in which case we'll lock up in | |
2145 | waitpid if there are other threads, even if they are all zombies too. | |
2146 | Basically, we're not supposed to use waitpid this way. | |
4a6ed09b PA |
2147 | tkill(pid,0) cannot be used here as it gets ESRCH for both |
2148 | for zombie and running processes. | |
432b4d03 JK |
2149 | |
2150 | As a workaround, check if we're waiting for the thread group leader and | |
2151 | if it's a zombie, and avoid calling waitpid if it is. | |
2152 | ||
2153 | This is racy, what if the tgl becomes a zombie right after we check? | |
2154 | Therefore always use WNOHANG with sigsuspend - it is equivalent to | |
5f572dec | 2155 | waiting waitpid but linux_proc_pid_is_zombie is safe this way. */ |
432b4d03 | 2156 | |
dfd4cc63 LM |
2157 | if (ptid_get_pid (lp->ptid) == ptid_get_lwp (lp->ptid) |
2158 | && linux_proc_pid_is_zombie (ptid_get_lwp (lp->ptid))) | |
d6b0e80f | 2159 | { |
d6b0e80f AC |
2160 | thread_dead = 1; |
2161 | if (debug_linux_nat) | |
432b4d03 JK |
2162 | fprintf_unfiltered (gdb_stdlog, |
2163 | "WL: Thread group leader %s vanished.\n", | |
d6b0e80f | 2164 | target_pid_to_str (lp->ptid)); |
432b4d03 | 2165 | break; |
d6b0e80f | 2166 | } |
432b4d03 JK |
2167 | |
2168 | /* Wait for next SIGCHLD and try again. This may let SIGCHLD handlers | |
2169 | get invoked despite our caller had them intentionally blocked by | |
2170 | block_child_signals. This is sensitive only to the loop of | |
2171 | linux_nat_wait_1 and there if we get called my_waitpid gets called | |
2172 | again before it gets to sigsuspend so we can safely let the handlers | |
2173 | get executed here. */ | |
2174 | ||
d36bf488 DE |
2175 | if (debug_linux_nat) |
2176 | fprintf_unfiltered (gdb_stdlog, "WL: about to sigsuspend\n"); | |
432b4d03 JK |
2177 | sigsuspend (&suspend_mask); |
2178 | } | |
2179 | ||
2180 | restore_child_signals_mask (&prev_mask); | |
2181 | ||
d6b0e80f AC |
2182 | if (!thread_dead) |
2183 | { | |
dfd4cc63 | 2184 | gdb_assert (pid == ptid_get_lwp (lp->ptid)); |
d6b0e80f AC |
2185 | |
2186 | if (debug_linux_nat) | |
2187 | { | |
2188 | fprintf_unfiltered (gdb_stdlog, | |
2189 | "WL: waitpid %s received %s\n", | |
2190 | target_pid_to_str (lp->ptid), | |
2191 | status_to_str (status)); | |
2192 | } | |
d6b0e80f | 2193 | |
a9f4bb21 PA |
2194 | /* Check if the thread has exited. */ |
2195 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
2196 | { | |
aa01bd36 PA |
2197 | if (report_thread_events |
2198 | || ptid_get_pid (lp->ptid) == ptid_get_lwp (lp->ptid)) | |
69dde7dc PA |
2199 | { |
2200 | if (debug_linux_nat) | |
aa01bd36 | 2201 | fprintf_unfiltered (gdb_stdlog, "WL: LWP %d exited.\n", |
69dde7dc PA |
2202 | ptid_get_pid (lp->ptid)); |
2203 | ||
aa01bd36 | 2204 | /* If this is the leader exiting, it means the whole |
69dde7dc PA |
2205 | process is gone. Store the status to report to the |
2206 | core. Store it in lp->waitstatus, because lp->status | |
2207 | would be ambiguous (W_EXITCODE(0,0) == 0). */ | |
2208 | store_waitstatus (&lp->waitstatus, status); | |
2209 | return 0; | |
2210 | } | |
2211 | ||
a9f4bb21 PA |
2212 | thread_dead = 1; |
2213 | if (debug_linux_nat) | |
2214 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
2215 | target_pid_to_str (lp->ptid)); | |
2216 | } | |
d6b0e80f AC |
2217 | } |
2218 | ||
2219 | if (thread_dead) | |
2220 | { | |
e26af52f | 2221 | exit_lwp (lp); |
d6b0e80f AC |
2222 | return 0; |
2223 | } | |
2224 | ||
2225 | gdb_assert (WIFSTOPPED (status)); | |
8817a6f2 | 2226 | lp->stopped = 1; |
d6b0e80f | 2227 | |
8784d563 PA |
2228 | if (lp->must_set_ptrace_flags) |
2229 | { | |
2230 | struct inferior *inf = find_inferior_pid (ptid_get_pid (lp->ptid)); | |
de0d863e | 2231 | int options = linux_nat_ptrace_options (inf->attach_flag); |
8784d563 | 2232 | |
de0d863e | 2233 | linux_enable_event_reporting (ptid_get_lwp (lp->ptid), options); |
8784d563 PA |
2234 | lp->must_set_ptrace_flags = 0; |
2235 | } | |
2236 | ||
ca2163eb PA |
2237 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
2238 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
2239 | { | |
2240 | /* No longer need the sysgood bit. The ptrace event ends up | |
2241 | recorded in lp->waitstatus if we care for it. We can carry | |
2242 | on handling the event like a regular SIGTRAP from here | |
2243 | on. */ | |
2244 | status = W_STOPCODE (SIGTRAP); | |
2245 | if (linux_handle_syscall_trap (lp, 1)) | |
2246 | return wait_lwp (lp); | |
2247 | } | |
bfd09d20 JS |
2248 | else |
2249 | { | |
2250 | /* Almost all other ptrace-stops are known to be outside of system | |
2251 | calls, with further exceptions in linux_handle_extended_wait. */ | |
2252 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2253 | } | |
ca2163eb | 2254 | |
d6b0e80f | 2255 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
89a5711c DB |
2256 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP |
2257 | && linux_is_extended_waitstatus (status)) | |
d6b0e80f AC |
2258 | { |
2259 | if (debug_linux_nat) | |
2260 | fprintf_unfiltered (gdb_stdlog, | |
2261 | "WL: Handling extended status 0x%06x\n", | |
2262 | status); | |
4dd63d48 | 2263 | linux_handle_extended_wait (lp, status); |
20ba1ce6 | 2264 | return 0; |
d6b0e80f AC |
2265 | } |
2266 | ||
2267 | return status; | |
2268 | } | |
2269 | ||
2270 | /* Send a SIGSTOP to LP. */ | |
2271 | ||
2272 | static int | |
2273 | stop_callback (struct lwp_info *lp, void *data) | |
2274 | { | |
2275 | if (!lp->stopped && !lp->signalled) | |
2276 | { | |
2277 | int ret; | |
2278 | ||
2279 | if (debug_linux_nat) | |
2280 | { | |
2281 | fprintf_unfiltered (gdb_stdlog, | |
2282 | "SC: kill %s **<SIGSTOP>**\n", | |
2283 | target_pid_to_str (lp->ptid)); | |
2284 | } | |
2285 | errno = 0; | |
dfd4cc63 | 2286 | ret = kill_lwp (ptid_get_lwp (lp->ptid), SIGSTOP); |
d6b0e80f AC |
2287 | if (debug_linux_nat) |
2288 | { | |
2289 | fprintf_unfiltered (gdb_stdlog, | |
2290 | "SC: lwp kill %d %s\n", | |
2291 | ret, | |
2292 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
2293 | } | |
2294 | ||
2295 | lp->signalled = 1; | |
2296 | gdb_assert (lp->status == 0); | |
2297 | } | |
2298 | ||
2299 | return 0; | |
2300 | } | |
2301 | ||
7b50312a PA |
2302 | /* Request a stop on LWP. */ |
2303 | ||
2304 | void | |
2305 | linux_stop_lwp (struct lwp_info *lwp) | |
2306 | { | |
2307 | stop_callback (lwp, NULL); | |
2308 | } | |
2309 | ||
2db9a427 PA |
2310 | /* See linux-nat.h */ |
2311 | ||
2312 | void | |
2313 | linux_stop_and_wait_all_lwps (void) | |
2314 | { | |
2315 | /* Stop all LWP's ... */ | |
2316 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); | |
2317 | ||
2318 | /* ... and wait until all of them have reported back that | |
2319 | they're no longer running. */ | |
2320 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); | |
2321 | } | |
2322 | ||
2323 | /* See linux-nat.h */ | |
2324 | ||
2325 | void | |
2326 | linux_unstop_all_lwps (void) | |
2327 | { | |
2328 | iterate_over_lwps (minus_one_ptid, | |
2329 | resume_stopped_resumed_lwps, &minus_one_ptid); | |
2330 | } | |
2331 | ||
57380f4e | 2332 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
2333 | |
2334 | static int | |
57380f4e DJ |
2335 | linux_nat_has_pending_sigint (int pid) |
2336 | { | |
2337 | sigset_t pending, blocked, ignored; | |
57380f4e DJ |
2338 | |
2339 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
2340 | ||
2341 | if (sigismember (&pending, SIGINT) | |
2342 | && !sigismember (&ignored, SIGINT)) | |
2343 | return 1; | |
2344 | ||
2345 | return 0; | |
2346 | } | |
2347 | ||
2348 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
2349 | ||
2350 | static int | |
2351 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2352 | { |
57380f4e DJ |
2353 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2354 | flag to consume the next one. */ | |
2355 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2356 | && WSTOPSIG (lp->status) == SIGINT) | |
2357 | lp->status = 0; | |
2358 | else | |
2359 | lp->ignore_sigint = 1; | |
2360 | ||
2361 | return 0; | |
2362 | } | |
2363 | ||
2364 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2365 | This function is called after we know the LWP has stopped; if the LWP | |
2366 | stopped before the expected SIGINT was delivered, then it will never have | |
2367 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2368 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2369 | |
57380f4e DJ |
2370 | static void |
2371 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2372 | { | |
2373 | if (!lp->ignore_sigint) | |
2374 | return; | |
2375 | ||
dfd4cc63 | 2376 | if (!linux_nat_has_pending_sigint (ptid_get_lwp (lp->ptid))) |
57380f4e DJ |
2377 | { |
2378 | if (debug_linux_nat) | |
2379 | fprintf_unfiltered (gdb_stdlog, | |
2380 | "MCIS: Clearing bogus flag for %s\n", | |
2381 | target_pid_to_str (lp->ptid)); | |
2382 | lp->ignore_sigint = 0; | |
2383 | } | |
2384 | } | |
2385 | ||
ebec9a0f PA |
2386 | /* Fetch the possible triggered data watchpoint info and store it in |
2387 | LP. | |
2388 | ||
2389 | On some archs, like x86, that use debug registers to set | |
2390 | watchpoints, it's possible that the way to know which watched | |
2391 | address trapped, is to check the register that is used to select | |
2392 | which address to watch. Problem is, between setting the watchpoint | |
2393 | and reading back which data address trapped, the user may change | |
2394 | the set of watchpoints, and, as a consequence, GDB changes the | |
2395 | debug registers in the inferior. To avoid reading back a stale | |
2396 | stopped-data-address when that happens, we cache in LP the fact | |
2397 | that a watchpoint trapped, and the corresponding data address, as | |
2398 | soon as we see LP stop with a SIGTRAP. If GDB changes the debug | |
2399 | registers meanwhile, we have the cached data we can rely on. */ | |
2400 | ||
9c02b525 PA |
2401 | static int |
2402 | check_stopped_by_watchpoint (struct lwp_info *lp) | |
ebec9a0f PA |
2403 | { |
2404 | struct cleanup *old_chain; | |
2405 | ||
2406 | if (linux_ops->to_stopped_by_watchpoint == NULL) | |
9c02b525 | 2407 | return 0; |
ebec9a0f PA |
2408 | |
2409 | old_chain = save_inferior_ptid (); | |
2410 | inferior_ptid = lp->ptid; | |
2411 | ||
9c02b525 | 2412 | if (linux_ops->to_stopped_by_watchpoint (linux_ops)) |
ebec9a0f | 2413 | { |
15c66dd6 | 2414 | lp->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; |
9c02b525 | 2415 | |
ebec9a0f PA |
2416 | if (linux_ops->to_stopped_data_address != NULL) |
2417 | lp->stopped_data_address_p = | |
2418 | linux_ops->to_stopped_data_address (¤t_target, | |
2419 | &lp->stopped_data_address); | |
2420 | else | |
2421 | lp->stopped_data_address_p = 0; | |
2422 | } | |
2423 | ||
2424 | do_cleanups (old_chain); | |
9c02b525 | 2425 | |
15c66dd6 | 2426 | return lp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
9c02b525 PA |
2427 | } |
2428 | ||
9c02b525 | 2429 | /* Returns true if the LWP had stopped for a watchpoint. */ |
ebec9a0f PA |
2430 | |
2431 | static int | |
6a109b6b | 2432 | linux_nat_stopped_by_watchpoint (struct target_ops *ops) |
ebec9a0f PA |
2433 | { |
2434 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2435 | ||
2436 | gdb_assert (lp != NULL); | |
2437 | ||
15c66dd6 | 2438 | return lp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
ebec9a0f PA |
2439 | } |
2440 | ||
2441 | static int | |
2442 | linux_nat_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p) | |
2443 | { | |
2444 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2445 | ||
2446 | gdb_assert (lp != NULL); | |
2447 | ||
2448 | *addr_p = lp->stopped_data_address; | |
2449 | ||
2450 | return lp->stopped_data_address_p; | |
2451 | } | |
2452 | ||
26ab7092 JK |
2453 | /* Commonly any breakpoint / watchpoint generate only SIGTRAP. */ |
2454 | ||
2455 | static int | |
2456 | sigtrap_is_event (int status) | |
2457 | { | |
2458 | return WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP; | |
2459 | } | |
2460 | ||
26ab7092 JK |
2461 | /* Set alternative SIGTRAP-like events recognizer. If |
2462 | breakpoint_inserted_here_p there then gdbarch_decr_pc_after_break will be | |
2463 | applied. */ | |
2464 | ||
2465 | void | |
2466 | linux_nat_set_status_is_event (struct target_ops *t, | |
2467 | int (*status_is_event) (int status)) | |
2468 | { | |
2469 | linux_nat_status_is_event = status_is_event; | |
2470 | } | |
2471 | ||
57380f4e DJ |
2472 | /* Wait until LP is stopped. */ |
2473 | ||
2474 | static int | |
2475 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2476 | { | |
c9657e70 | 2477 | struct inferior *inf = find_inferior_ptid (lp->ptid); |
6c95b8df PA |
2478 | |
2479 | /* If this is a vfork parent, bail out, it is not going to report | |
2480 | any SIGSTOP until the vfork is done with. */ | |
2481 | if (inf->vfork_child != NULL) | |
2482 | return 0; | |
2483 | ||
d6b0e80f AC |
2484 | if (!lp->stopped) |
2485 | { | |
2486 | int status; | |
2487 | ||
2488 | status = wait_lwp (lp); | |
2489 | if (status == 0) | |
2490 | return 0; | |
2491 | ||
57380f4e DJ |
2492 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2493 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2494 | { |
57380f4e | 2495 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2496 | |
2497 | errno = 0; | |
dfd4cc63 | 2498 | ptrace (PTRACE_CONT, ptid_get_lwp (lp->ptid), 0, 0); |
8817a6f2 | 2499 | lp->stopped = 0; |
d6b0e80f AC |
2500 | if (debug_linux_nat) |
2501 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2502 | "PTRACE_CONT %s, 0, 0 (%s) " |
2503 | "(discarding SIGINT)\n", | |
d6b0e80f AC |
2504 | target_pid_to_str (lp->ptid), |
2505 | errno ? safe_strerror (errno) : "OK"); | |
2506 | ||
57380f4e | 2507 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2508 | } |
2509 | ||
57380f4e DJ |
2510 | maybe_clear_ignore_sigint (lp); |
2511 | ||
d6b0e80f AC |
2512 | if (WSTOPSIG (status) != SIGSTOP) |
2513 | { | |
e5ef252a | 2514 | /* The thread was stopped with a signal other than SIGSTOP. */ |
7feb7d06 | 2515 | |
e5ef252a PA |
2516 | if (debug_linux_nat) |
2517 | fprintf_unfiltered (gdb_stdlog, | |
2518 | "SWC: Pending event %s in %s\n", | |
2519 | status_to_str ((int) status), | |
2520 | target_pid_to_str (lp->ptid)); | |
2521 | ||
2522 | /* Save the sigtrap event. */ | |
2523 | lp->status = status; | |
e5ef252a | 2524 | gdb_assert (lp->signalled); |
e7ad2f14 | 2525 | save_stop_reason (lp); |
d6b0e80f AC |
2526 | } |
2527 | else | |
2528 | { | |
2529 | /* We caught the SIGSTOP that we intended to catch, so | |
2530 | there's no SIGSTOP pending. */ | |
e5ef252a PA |
2531 | |
2532 | if (debug_linux_nat) | |
2533 | fprintf_unfiltered (gdb_stdlog, | |
2bf6fb9d | 2534 | "SWC: Expected SIGSTOP caught for %s.\n", |
e5ef252a PA |
2535 | target_pid_to_str (lp->ptid)); |
2536 | ||
e5ef252a PA |
2537 | /* Reset SIGNALLED only after the stop_wait_callback call |
2538 | above as it does gdb_assert on SIGNALLED. */ | |
d6b0e80f AC |
2539 | lp->signalled = 0; |
2540 | } | |
2541 | } | |
2542 | ||
2543 | return 0; | |
2544 | } | |
2545 | ||
9c02b525 PA |
2546 | /* Return non-zero if LP has a wait status pending. Discard the |
2547 | pending event and resume the LWP if the event that originally | |
2548 | caused the stop became uninteresting. */ | |
d6b0e80f AC |
2549 | |
2550 | static int | |
2551 | status_callback (struct lwp_info *lp, void *data) | |
2552 | { | |
2553 | /* Only report a pending wait status if we pretend that this has | |
2554 | indeed been resumed. */ | |
ca2163eb PA |
2555 | if (!lp->resumed) |
2556 | return 0; | |
2557 | ||
eb54c8bf PA |
2558 | if (!lwp_status_pending_p (lp)) |
2559 | return 0; | |
2560 | ||
15c66dd6 PA |
2561 | if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
2562 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) | |
9c02b525 PA |
2563 | { |
2564 | struct regcache *regcache = get_thread_regcache (lp->ptid); | |
9c02b525 PA |
2565 | CORE_ADDR pc; |
2566 | int discard = 0; | |
2567 | ||
9c02b525 PA |
2568 | pc = regcache_read_pc (regcache); |
2569 | ||
2570 | if (pc != lp->stop_pc) | |
2571 | { | |
2572 | if (debug_linux_nat) | |
2573 | fprintf_unfiltered (gdb_stdlog, | |
2574 | "SC: PC of %s changed. was=%s, now=%s\n", | |
2575 | target_pid_to_str (lp->ptid), | |
2576 | paddress (target_gdbarch (), lp->stop_pc), | |
2577 | paddress (target_gdbarch (), pc)); | |
2578 | discard = 1; | |
2579 | } | |
faf09f01 PA |
2580 | |
2581 | #if !USE_SIGTRAP_SIGINFO | |
9c02b525 PA |
2582 | else if (!breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) |
2583 | { | |
2584 | if (debug_linux_nat) | |
2585 | fprintf_unfiltered (gdb_stdlog, | |
2586 | "SC: previous breakpoint of %s, at %s gone\n", | |
2587 | target_pid_to_str (lp->ptid), | |
2588 | paddress (target_gdbarch (), lp->stop_pc)); | |
2589 | ||
2590 | discard = 1; | |
2591 | } | |
faf09f01 | 2592 | #endif |
9c02b525 PA |
2593 | |
2594 | if (discard) | |
2595 | { | |
2596 | if (debug_linux_nat) | |
2597 | fprintf_unfiltered (gdb_stdlog, | |
2598 | "SC: pending event of %s cancelled.\n", | |
2599 | target_pid_to_str (lp->ptid)); | |
2600 | ||
2601 | lp->status = 0; | |
2602 | linux_resume_one_lwp (lp, lp->step, GDB_SIGNAL_0); | |
2603 | return 0; | |
2604 | } | |
9c02b525 PA |
2605 | } |
2606 | ||
eb54c8bf | 2607 | return 1; |
d6b0e80f AC |
2608 | } |
2609 | ||
d6b0e80f AC |
2610 | /* Count the LWP's that have had events. */ |
2611 | ||
2612 | static int | |
2613 | count_events_callback (struct lwp_info *lp, void *data) | |
2614 | { | |
9a3c8263 | 2615 | int *count = (int *) data; |
d6b0e80f AC |
2616 | |
2617 | gdb_assert (count != NULL); | |
2618 | ||
9c02b525 PA |
2619 | /* Select only resumed LWPs that have an event pending. */ |
2620 | if (lp->resumed && lwp_status_pending_p (lp)) | |
d6b0e80f AC |
2621 | (*count)++; |
2622 | ||
2623 | return 0; | |
2624 | } | |
2625 | ||
2626 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2627 | ||
2628 | static int | |
2629 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2630 | { | |
25289eb2 PA |
2631 | if (lp->last_resume_kind == resume_step |
2632 | && lp->status != 0) | |
d6b0e80f AC |
2633 | return 1; |
2634 | else | |
2635 | return 0; | |
2636 | } | |
2637 | ||
8a99810d PA |
2638 | /* Returns true if LP has a status pending. */ |
2639 | ||
2640 | static int | |
2641 | lwp_status_pending_p (struct lwp_info *lp) | |
2642 | { | |
2643 | /* We check for lp->waitstatus in addition to lp->status, because we | |
2644 | can have pending process exits recorded in lp->status and | |
2645 | W_EXITCODE(0,0) happens to be 0. */ | |
2646 | return lp->status != 0 || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE; | |
2647 | } | |
2648 | ||
b90fc188 | 2649 | /* Select the Nth LWP that has had an event. */ |
d6b0e80f AC |
2650 | |
2651 | static int | |
2652 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2653 | { | |
9a3c8263 | 2654 | int *selector = (int *) data; |
d6b0e80f AC |
2655 | |
2656 | gdb_assert (selector != NULL); | |
2657 | ||
9c02b525 PA |
2658 | /* Select only resumed LWPs that have an event pending. */ |
2659 | if (lp->resumed && lwp_status_pending_p (lp)) | |
d6b0e80f AC |
2660 | if ((*selector)-- == 0) |
2661 | return 1; | |
2662 | ||
2663 | return 0; | |
2664 | } | |
2665 | ||
e7ad2f14 PA |
2666 | /* Called when the LWP stopped for a signal/trap. If it stopped for a |
2667 | trap check what caused it (breakpoint, watchpoint, trace, etc.), | |
2668 | and save the result in the LWP's stop_reason field. If it stopped | |
2669 | for a breakpoint, decrement the PC if necessary on the lwp's | |
2670 | architecture. */ | |
9c02b525 | 2671 | |
e7ad2f14 PA |
2672 | static void |
2673 | save_stop_reason (struct lwp_info *lp) | |
710151dd | 2674 | { |
e7ad2f14 PA |
2675 | struct regcache *regcache; |
2676 | struct gdbarch *gdbarch; | |
515630c5 | 2677 | CORE_ADDR pc; |
9c02b525 | 2678 | CORE_ADDR sw_bp_pc; |
faf09f01 PA |
2679 | #if USE_SIGTRAP_SIGINFO |
2680 | siginfo_t siginfo; | |
2681 | #endif | |
9c02b525 | 2682 | |
e7ad2f14 PA |
2683 | gdb_assert (lp->stop_reason == TARGET_STOPPED_BY_NO_REASON); |
2684 | gdb_assert (lp->status != 0); | |
2685 | ||
2686 | if (!linux_nat_status_is_event (lp->status)) | |
2687 | return; | |
2688 | ||
2689 | regcache = get_thread_regcache (lp->ptid); | |
2690 | gdbarch = get_regcache_arch (regcache); | |
2691 | ||
9c02b525 | 2692 | pc = regcache_read_pc (regcache); |
527a273a | 2693 | sw_bp_pc = pc - gdbarch_decr_pc_after_break (gdbarch); |
515630c5 | 2694 | |
faf09f01 PA |
2695 | #if USE_SIGTRAP_SIGINFO |
2696 | if (linux_nat_get_siginfo (lp->ptid, &siginfo)) | |
2697 | { | |
2698 | if (siginfo.si_signo == SIGTRAP) | |
2699 | { | |
e7ad2f14 PA |
2700 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code) |
2701 | && GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) | |
faf09f01 | 2702 | { |
e7ad2f14 PA |
2703 | /* The si_code is ambiguous on this arch -- check debug |
2704 | registers. */ | |
2705 | if (!check_stopped_by_watchpoint (lp)) | |
2706 | lp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
2707 | } | |
2708 | else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) | |
2709 | { | |
2710 | /* If we determine the LWP stopped for a SW breakpoint, | |
2711 | trust it. Particularly don't check watchpoint | |
2712 | registers, because at least on s390, we'd find | |
2713 | stopped-by-watchpoint as long as there's a watchpoint | |
2714 | set. */ | |
faf09f01 | 2715 | lp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
faf09f01 | 2716 | } |
e7ad2f14 | 2717 | else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) |
faf09f01 | 2718 | { |
e7ad2f14 PA |
2719 | /* This can indicate either a hardware breakpoint or |
2720 | hardware watchpoint. Check debug registers. */ | |
2721 | if (!check_stopped_by_watchpoint (lp)) | |
2722 | lp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
faf09f01 | 2723 | } |
2bf6fb9d PA |
2724 | else if (siginfo.si_code == TRAP_TRACE) |
2725 | { | |
2726 | if (debug_linux_nat) | |
2727 | fprintf_unfiltered (gdb_stdlog, | |
2728 | "CSBB: %s stopped by trace\n", | |
2729 | target_pid_to_str (lp->ptid)); | |
e7ad2f14 PA |
2730 | |
2731 | /* We may have single stepped an instruction that | |
2732 | triggered a watchpoint. In that case, on some | |
2733 | architectures (such as x86), instead of TRAP_HWBKPT, | |
2734 | si_code indicates TRAP_TRACE, and we need to check | |
2735 | the debug registers separately. */ | |
2736 | check_stopped_by_watchpoint (lp); | |
2bf6fb9d | 2737 | } |
faf09f01 PA |
2738 | } |
2739 | } | |
2740 | #else | |
9c02b525 PA |
2741 | if ((!lp->step || lp->stop_pc == sw_bp_pc) |
2742 | && software_breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
2743 | sw_bp_pc)) | |
710151dd | 2744 | { |
9c02b525 PA |
2745 | /* The LWP was either continued, or stepped a software |
2746 | breakpoint instruction. */ | |
e7ad2f14 PA |
2747 | lp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
2748 | } | |
2749 | ||
2750 | if (hardware_breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
2751 | lp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
2752 | ||
2753 | if (lp->stop_reason == TARGET_STOPPED_BY_NO_REASON) | |
2754 | check_stopped_by_watchpoint (lp); | |
2755 | #endif | |
2756 | ||
2757 | if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) | |
2758 | { | |
710151dd PA |
2759 | if (debug_linux_nat) |
2760 | fprintf_unfiltered (gdb_stdlog, | |
2bf6fb9d | 2761 | "CSBB: %s stopped by software breakpoint\n", |
710151dd PA |
2762 | target_pid_to_str (lp->ptid)); |
2763 | ||
2764 | /* Back up the PC if necessary. */ | |
9c02b525 PA |
2765 | if (pc != sw_bp_pc) |
2766 | regcache_write_pc (regcache, sw_bp_pc); | |
515630c5 | 2767 | |
e7ad2f14 PA |
2768 | /* Update this so we record the correct stop PC below. */ |
2769 | pc = sw_bp_pc; | |
710151dd | 2770 | } |
e7ad2f14 | 2771 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) |
9c02b525 PA |
2772 | { |
2773 | if (debug_linux_nat) | |
2774 | fprintf_unfiltered (gdb_stdlog, | |
e7ad2f14 PA |
2775 | "CSBB: %s stopped by hardware breakpoint\n", |
2776 | target_pid_to_str (lp->ptid)); | |
2777 | } | |
2778 | else if (lp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) | |
2779 | { | |
2780 | if (debug_linux_nat) | |
2781 | fprintf_unfiltered (gdb_stdlog, | |
2782 | "CSBB: %s stopped by hardware watchpoint\n", | |
9c02b525 | 2783 | target_pid_to_str (lp->ptid)); |
9c02b525 | 2784 | } |
d6b0e80f | 2785 | |
e7ad2f14 | 2786 | lp->stop_pc = pc; |
d6b0e80f AC |
2787 | } |
2788 | ||
faf09f01 PA |
2789 | |
2790 | /* Returns true if the LWP had stopped for a software breakpoint. */ | |
2791 | ||
2792 | static int | |
2793 | linux_nat_stopped_by_sw_breakpoint (struct target_ops *ops) | |
2794 | { | |
2795 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2796 | ||
2797 | gdb_assert (lp != NULL); | |
2798 | ||
2799 | return lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT; | |
2800 | } | |
2801 | ||
2802 | /* Implement the supports_stopped_by_sw_breakpoint method. */ | |
2803 | ||
2804 | static int | |
2805 | linux_nat_supports_stopped_by_sw_breakpoint (struct target_ops *ops) | |
2806 | { | |
2807 | return USE_SIGTRAP_SIGINFO; | |
2808 | } | |
2809 | ||
2810 | /* Returns true if the LWP had stopped for a hardware | |
2811 | breakpoint/watchpoint. */ | |
2812 | ||
2813 | static int | |
2814 | linux_nat_stopped_by_hw_breakpoint (struct target_ops *ops) | |
2815 | { | |
2816 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2817 | ||
2818 | gdb_assert (lp != NULL); | |
2819 | ||
2820 | return lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT; | |
2821 | } | |
2822 | ||
2823 | /* Implement the supports_stopped_by_hw_breakpoint method. */ | |
2824 | ||
2825 | static int | |
2826 | linux_nat_supports_stopped_by_hw_breakpoint (struct target_ops *ops) | |
2827 | { | |
2828 | return USE_SIGTRAP_SIGINFO; | |
2829 | } | |
2830 | ||
d6b0e80f AC |
2831 | /* Select one LWP out of those that have events pending. */ |
2832 | ||
2833 | static void | |
d90e17a7 | 2834 | select_event_lwp (ptid_t filter, struct lwp_info **orig_lp, int *status) |
d6b0e80f AC |
2835 | { |
2836 | int num_events = 0; | |
2837 | int random_selector; | |
9c02b525 | 2838 | struct lwp_info *event_lp = NULL; |
d6b0e80f | 2839 | |
ac264b3b | 2840 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
2841 | (*orig_lp)->status = *status; |
2842 | ||
9c02b525 PA |
2843 | /* In all-stop, give preference to the LWP that is being |
2844 | single-stepped. There will be at most one, and it will be the | |
2845 | LWP that the core is most interested in. If we didn't do this, | |
2846 | then we'd have to handle pending step SIGTRAPs somehow in case | |
2847 | the core later continues the previously-stepped thread, as | |
2848 | otherwise we'd report the pending SIGTRAP then, and the core, not | |
2849 | having stepped the thread, wouldn't understand what the trap was | |
2850 | for, and therefore would report it to the user as a random | |
2851 | signal. */ | |
fbea99ea | 2852 | if (!target_is_non_stop_p ()) |
d6b0e80f | 2853 | { |
9c02b525 PA |
2854 | event_lp = iterate_over_lwps (filter, |
2855 | select_singlestep_lwp_callback, NULL); | |
2856 | if (event_lp != NULL) | |
2857 | { | |
2858 | if (debug_linux_nat) | |
2859 | fprintf_unfiltered (gdb_stdlog, | |
2860 | "SEL: Select single-step %s\n", | |
2861 | target_pid_to_str (event_lp->ptid)); | |
2862 | } | |
d6b0e80f | 2863 | } |
9c02b525 PA |
2864 | |
2865 | if (event_lp == NULL) | |
d6b0e80f | 2866 | { |
9c02b525 | 2867 | /* Pick one at random, out of those which have had events. */ |
d6b0e80f | 2868 | |
9c02b525 | 2869 | /* First see how many events we have. */ |
d90e17a7 | 2870 | iterate_over_lwps (filter, count_events_callback, &num_events); |
8bf3b159 | 2871 | gdb_assert (num_events > 0); |
d6b0e80f | 2872 | |
9c02b525 PA |
2873 | /* Now randomly pick a LWP out of those that have had |
2874 | events. */ | |
d6b0e80f AC |
2875 | random_selector = (int) |
2876 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2877 | ||
2878 | if (debug_linux_nat && num_events > 1) | |
2879 | fprintf_unfiltered (gdb_stdlog, | |
9c02b525 | 2880 | "SEL: Found %d events, selecting #%d\n", |
d6b0e80f AC |
2881 | num_events, random_selector); |
2882 | ||
d90e17a7 PA |
2883 | event_lp = iterate_over_lwps (filter, |
2884 | select_event_lwp_callback, | |
d6b0e80f AC |
2885 | &random_selector); |
2886 | } | |
2887 | ||
2888 | if (event_lp != NULL) | |
2889 | { | |
2890 | /* Switch the event LWP. */ | |
2891 | *orig_lp = event_lp; | |
2892 | *status = event_lp->status; | |
2893 | } | |
2894 | ||
2895 | /* Flush the wait status for the event LWP. */ | |
2896 | (*orig_lp)->status = 0; | |
2897 | } | |
2898 | ||
2899 | /* Return non-zero if LP has been resumed. */ | |
2900 | ||
2901 | static int | |
2902 | resumed_callback (struct lwp_info *lp, void *data) | |
2903 | { | |
2904 | return lp->resumed; | |
2905 | } | |
2906 | ||
02f3fc28 | 2907 | /* Check if we should go on and pass this event to common code. |
9c02b525 | 2908 | Return the affected lwp if we are, or NULL otherwise. */ |
12d9289a | 2909 | |
02f3fc28 | 2910 | static struct lwp_info * |
9c02b525 | 2911 | linux_nat_filter_event (int lwpid, int status) |
02f3fc28 PA |
2912 | { |
2913 | struct lwp_info *lp; | |
89a5711c | 2914 | int event = linux_ptrace_get_extended_event (status); |
02f3fc28 PA |
2915 | |
2916 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
2917 | ||
2918 | /* Check for stop events reported by a process we didn't already | |
2919 | know about - anything not already in our LWP list. | |
2920 | ||
2921 | If we're expecting to receive stopped processes after | |
2922 | fork, vfork, and clone events, then we'll just add the | |
2923 | new one to our list and go back to waiting for the event | |
2924 | to be reported - the stopped process might be returned | |
0e5bf2a8 PA |
2925 | from waitpid before or after the event is. |
2926 | ||
2927 | But note the case of a non-leader thread exec'ing after the | |
2928 | leader having exited, and gone from our lists. The non-leader | |
2929 | thread changes its tid to the tgid. */ | |
2930 | ||
2931 | if (WIFSTOPPED (status) && lp == NULL | |
89a5711c | 2932 | && (WSTOPSIG (status) == SIGTRAP && event == PTRACE_EVENT_EXEC)) |
0e5bf2a8 PA |
2933 | { |
2934 | /* A multi-thread exec after we had seen the leader exiting. */ | |
2935 | if (debug_linux_nat) | |
2936 | fprintf_unfiltered (gdb_stdlog, | |
2937 | "LLW: Re-adding thread group leader LWP %d.\n", | |
2938 | lwpid); | |
2939 | ||
dfd4cc63 | 2940 | lp = add_lwp (ptid_build (lwpid, lwpid, 0)); |
0e5bf2a8 PA |
2941 | lp->stopped = 1; |
2942 | lp->resumed = 1; | |
2943 | add_thread (lp->ptid); | |
2944 | } | |
2945 | ||
02f3fc28 PA |
2946 | if (WIFSTOPPED (status) && !lp) |
2947 | { | |
3b27ef47 PA |
2948 | if (debug_linux_nat) |
2949 | fprintf_unfiltered (gdb_stdlog, | |
2950 | "LHEW: saving LWP %ld status %s in stopped_pids list\n", | |
2951 | (long) lwpid, status_to_str (status)); | |
84636d28 | 2952 | add_to_pid_list (&stopped_pids, lwpid, status); |
02f3fc28 PA |
2953 | return NULL; |
2954 | } | |
2955 | ||
2956 | /* Make sure we don't report an event for the exit of an LWP not in | |
1777feb0 | 2957 | our list, i.e. not part of the current process. This can happen |
fd62cb89 | 2958 | if we detach from a program we originally forked and then it |
02f3fc28 PA |
2959 | exits. */ |
2960 | if (!WIFSTOPPED (status) && !lp) | |
2961 | return NULL; | |
2962 | ||
8817a6f2 PA |
2963 | /* This LWP is stopped now. (And if dead, this prevents it from |
2964 | ever being continued.) */ | |
2965 | lp->stopped = 1; | |
2966 | ||
8784d563 PA |
2967 | if (WIFSTOPPED (status) && lp->must_set_ptrace_flags) |
2968 | { | |
2969 | struct inferior *inf = find_inferior_pid (ptid_get_pid (lp->ptid)); | |
de0d863e | 2970 | int options = linux_nat_ptrace_options (inf->attach_flag); |
8784d563 | 2971 | |
de0d863e | 2972 | linux_enable_event_reporting (ptid_get_lwp (lp->ptid), options); |
8784d563 PA |
2973 | lp->must_set_ptrace_flags = 0; |
2974 | } | |
2975 | ||
ca2163eb PA |
2976 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
2977 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
2978 | { | |
2979 | /* No longer need the sysgood bit. The ptrace event ends up | |
2980 | recorded in lp->waitstatus if we care for it. We can carry | |
2981 | on handling the event like a regular SIGTRAP from here | |
2982 | on. */ | |
2983 | status = W_STOPCODE (SIGTRAP); | |
2984 | if (linux_handle_syscall_trap (lp, 0)) | |
2985 | return NULL; | |
2986 | } | |
bfd09d20 JS |
2987 | else |
2988 | { | |
2989 | /* Almost all other ptrace-stops are known to be outside of system | |
2990 | calls, with further exceptions in linux_handle_extended_wait. */ | |
2991 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2992 | } | |
02f3fc28 | 2993 | |
ca2163eb | 2994 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
89a5711c DB |
2995 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP |
2996 | && linux_is_extended_waitstatus (status)) | |
02f3fc28 PA |
2997 | { |
2998 | if (debug_linux_nat) | |
2999 | fprintf_unfiltered (gdb_stdlog, | |
3000 | "LLW: Handling extended status 0x%06x\n", | |
3001 | status); | |
4dd63d48 | 3002 | if (linux_handle_extended_wait (lp, status)) |
02f3fc28 PA |
3003 | return NULL; |
3004 | } | |
3005 | ||
3006 | /* Check if the thread has exited. */ | |
9c02b525 PA |
3007 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
3008 | { | |
aa01bd36 PA |
3009 | if (!report_thread_events |
3010 | && num_lwps (ptid_get_pid (lp->ptid)) > 1) | |
02f3fc28 | 3011 | { |
9c02b525 PA |
3012 | if (debug_linux_nat) |
3013 | fprintf_unfiltered (gdb_stdlog, | |
3014 | "LLW: %s exited.\n", | |
3015 | target_pid_to_str (lp->ptid)); | |
3016 | ||
4a6ed09b PA |
3017 | /* If there is at least one more LWP, then the exit signal |
3018 | was not the end of the debugged application and should be | |
3019 | ignored. */ | |
3020 | exit_lwp (lp); | |
3021 | return NULL; | |
02f3fc28 PA |
3022 | } |
3023 | ||
77598427 PA |
3024 | /* Note that even if the leader was ptrace-stopped, it can still |
3025 | exit, if e.g., some other thread brings down the whole | |
3026 | process (calls `exit'). So don't assert that the lwp is | |
3027 | resumed. */ | |
02f3fc28 PA |
3028 | if (debug_linux_nat) |
3029 | fprintf_unfiltered (gdb_stdlog, | |
aa01bd36 | 3030 | "LWP %ld exited (resumed=%d)\n", |
77598427 | 3031 | ptid_get_lwp (lp->ptid), lp->resumed); |
02f3fc28 | 3032 | |
9c02b525 PA |
3033 | /* Dead LWP's aren't expected to reported a pending sigstop. */ |
3034 | lp->signalled = 0; | |
3035 | ||
3036 | /* Store the pending event in the waitstatus, because | |
3037 | W_EXITCODE(0,0) == 0. */ | |
3038 | store_waitstatus (&lp->waitstatus, status); | |
3039 | return lp; | |
02f3fc28 PA |
3040 | } |
3041 | ||
02f3fc28 PA |
3042 | /* Make sure we don't report a SIGSTOP that we sent ourselves in |
3043 | an attempt to stop an LWP. */ | |
3044 | if (lp->signalled | |
3045 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
3046 | { | |
02f3fc28 PA |
3047 | lp->signalled = 0; |
3048 | ||
2bf6fb9d | 3049 | if (lp->last_resume_kind == resume_stop) |
25289eb2 | 3050 | { |
2bf6fb9d PA |
3051 | if (debug_linux_nat) |
3052 | fprintf_unfiltered (gdb_stdlog, | |
3053 | "LLW: resume_stop SIGSTOP caught for %s.\n", | |
3054 | target_pid_to_str (lp->ptid)); | |
3055 | } | |
3056 | else | |
3057 | { | |
3058 | /* This is a delayed SIGSTOP. Filter out the event. */ | |
02f3fc28 | 3059 | |
25289eb2 PA |
3060 | if (debug_linux_nat) |
3061 | fprintf_unfiltered (gdb_stdlog, | |
2bf6fb9d | 3062 | "LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", |
25289eb2 PA |
3063 | lp->step ? |
3064 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3065 | target_pid_to_str (lp->ptid)); | |
02f3fc28 | 3066 | |
2bf6fb9d | 3067 | linux_resume_one_lwp (lp, lp->step, GDB_SIGNAL_0); |
25289eb2 | 3068 | gdb_assert (lp->resumed); |
25289eb2 PA |
3069 | return NULL; |
3070 | } | |
02f3fc28 PA |
3071 | } |
3072 | ||
57380f4e DJ |
3073 | /* Make sure we don't report a SIGINT that we have already displayed |
3074 | for another thread. */ | |
3075 | if (lp->ignore_sigint | |
3076 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
3077 | { | |
3078 | if (debug_linux_nat) | |
3079 | fprintf_unfiltered (gdb_stdlog, | |
3080 | "LLW: Delayed SIGINT caught for %s.\n", | |
3081 | target_pid_to_str (lp->ptid)); | |
3082 | ||
3083 | /* This is a delayed SIGINT. */ | |
3084 | lp->ignore_sigint = 0; | |
3085 | ||
8a99810d | 3086 | linux_resume_one_lwp (lp, lp->step, GDB_SIGNAL_0); |
57380f4e DJ |
3087 | if (debug_linux_nat) |
3088 | fprintf_unfiltered (gdb_stdlog, | |
3089 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
3090 | lp->step ? | |
3091 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3092 | target_pid_to_str (lp->ptid)); | |
57380f4e DJ |
3093 | gdb_assert (lp->resumed); |
3094 | ||
3095 | /* Discard the event. */ | |
3096 | return NULL; | |
3097 | } | |
3098 | ||
9c02b525 PA |
3099 | /* Don't report signals that GDB isn't interested in, such as |
3100 | signals that are neither printed nor stopped upon. Stopping all | |
3101 | threads can be a bit time-consuming so if we want decent | |
3102 | performance with heavily multi-threaded programs, especially when | |
3103 | they're using a high frequency timer, we'd better avoid it if we | |
3104 | can. */ | |
3105 | if (WIFSTOPPED (status)) | |
3106 | { | |
3107 | enum gdb_signal signo = gdb_signal_from_host (WSTOPSIG (status)); | |
3108 | ||
fbea99ea | 3109 | if (!target_is_non_stop_p ()) |
9c02b525 PA |
3110 | { |
3111 | /* Only do the below in all-stop, as we currently use SIGSTOP | |
3112 | to implement target_stop (see linux_nat_stop) in | |
3113 | non-stop. */ | |
3114 | if (signo == GDB_SIGNAL_INT && signal_pass_state (signo) == 0) | |
3115 | { | |
3116 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
3117 | forwarded to the entire process group, that is, all LWPs | |
3118 | will receive it - unless they're using CLONE_THREAD to | |
3119 | share signals. Since we only want to report it once, we | |
3120 | mark it as ignored for all LWPs except this one. */ | |
3121 | iterate_over_lwps (pid_to_ptid (ptid_get_pid (lp->ptid)), | |
3122 | set_ignore_sigint, NULL); | |
3123 | lp->ignore_sigint = 0; | |
3124 | } | |
3125 | else | |
3126 | maybe_clear_ignore_sigint (lp); | |
3127 | } | |
3128 | ||
3129 | /* When using hardware single-step, we need to report every signal. | |
c9587f88 AT |
3130 | Otherwise, signals in pass_mask may be short-circuited |
3131 | except signals that might be caused by a breakpoint. */ | |
9c02b525 | 3132 | if (!lp->step |
c9587f88 AT |
3133 | && WSTOPSIG (status) && sigismember (&pass_mask, WSTOPSIG (status)) |
3134 | && !linux_wstatus_maybe_breakpoint (status)) | |
9c02b525 PA |
3135 | { |
3136 | linux_resume_one_lwp (lp, lp->step, signo); | |
3137 | if (debug_linux_nat) | |
3138 | fprintf_unfiltered (gdb_stdlog, | |
3139 | "LLW: %s %s, %s (preempt 'handle')\n", | |
3140 | lp->step ? | |
3141 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3142 | target_pid_to_str (lp->ptid), | |
3143 | (signo != GDB_SIGNAL_0 | |
3144 | ? strsignal (gdb_signal_to_host (signo)) | |
3145 | : "0")); | |
3146 | return NULL; | |
3147 | } | |
3148 | } | |
3149 | ||
02f3fc28 PA |
3150 | /* An interesting event. */ |
3151 | gdb_assert (lp); | |
ca2163eb | 3152 | lp->status = status; |
e7ad2f14 | 3153 | save_stop_reason (lp); |
02f3fc28 PA |
3154 | return lp; |
3155 | } | |
3156 | ||
0e5bf2a8 PA |
3157 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
3158 | their exits until all other threads in the group have exited. */ | |
3159 | ||
3160 | static void | |
3161 | check_zombie_leaders (void) | |
3162 | { | |
3163 | struct inferior *inf; | |
3164 | ||
3165 | ALL_INFERIORS (inf) | |
3166 | { | |
3167 | struct lwp_info *leader_lp; | |
3168 | ||
3169 | if (inf->pid == 0) | |
3170 | continue; | |
3171 | ||
3172 | leader_lp = find_lwp_pid (pid_to_ptid (inf->pid)); | |
3173 | if (leader_lp != NULL | |
3174 | /* Check if there are other threads in the group, as we may | |
3175 | have raced with the inferior simply exiting. */ | |
3176 | && num_lwps (inf->pid) > 1 | |
5f572dec | 3177 | && linux_proc_pid_is_zombie (inf->pid)) |
0e5bf2a8 PA |
3178 | { |
3179 | if (debug_linux_nat) | |
3180 | fprintf_unfiltered (gdb_stdlog, | |
3181 | "CZL: Thread group leader %d zombie " | |
3182 | "(it exited, or another thread execd).\n", | |
3183 | inf->pid); | |
3184 | ||
3185 | /* A leader zombie can mean one of two things: | |
3186 | ||
3187 | - It exited, and there's an exit status pending | |
3188 | available, or only the leader exited (not the whole | |
3189 | program). In the latter case, we can't waitpid the | |
3190 | leader's exit status until all other threads are gone. | |
3191 | ||
3192 | - There are 3 or more threads in the group, and a thread | |
4a6ed09b PA |
3193 | other than the leader exec'd. See comments on exec |
3194 | events at the top of the file. We could try | |
0e5bf2a8 PA |
3195 | distinguishing the exit and exec cases, by waiting once |
3196 | more, and seeing if something comes out, but it doesn't | |
3197 | sound useful. The previous leader _does_ go away, and | |
3198 | we'll re-add the new one once we see the exec event | |
3199 | (which is just the same as what would happen if the | |
3200 | previous leader did exit voluntarily before some other | |
3201 | thread execs). */ | |
3202 | ||
3203 | if (debug_linux_nat) | |
3204 | fprintf_unfiltered (gdb_stdlog, | |
3205 | "CZL: Thread group leader %d vanished.\n", | |
3206 | inf->pid); | |
3207 | exit_lwp (leader_lp); | |
3208 | } | |
3209 | } | |
3210 | } | |
3211 | ||
aa01bd36 PA |
3212 | /* Convenience function that is called when the kernel reports an exit |
3213 | event. This decides whether to report the event to GDB as a | |
3214 | process exit event, a thread exit event, or to suppress the | |
3215 | event. */ | |
3216 | ||
3217 | static ptid_t | |
3218 | filter_exit_event (struct lwp_info *event_child, | |
3219 | struct target_waitstatus *ourstatus) | |
3220 | { | |
3221 | ptid_t ptid = event_child->ptid; | |
3222 | ||
3223 | if (num_lwps (ptid_get_pid (ptid)) > 1) | |
3224 | { | |
3225 | if (report_thread_events) | |
3226 | ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED; | |
3227 | else | |
3228 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3229 | ||
3230 | exit_lwp (event_child); | |
3231 | } | |
3232 | ||
3233 | return ptid; | |
3234 | } | |
3235 | ||
d6b0e80f | 3236 | static ptid_t |
7feb7d06 | 3237 | linux_nat_wait_1 (struct target_ops *ops, |
47608cb1 PA |
3238 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3239 | int target_options) | |
d6b0e80f | 3240 | { |
fc9b8e47 | 3241 | sigset_t prev_mask; |
4b60df3d | 3242 | enum resume_kind last_resume_kind; |
12d9289a | 3243 | struct lwp_info *lp; |
12d9289a | 3244 | int status; |
d6b0e80f | 3245 | |
01124a23 | 3246 | if (debug_linux_nat) |
b84876c2 PA |
3247 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); |
3248 | ||
f973ed9c DJ |
3249 | /* The first time we get here after starting a new inferior, we may |
3250 | not have added it to the LWP list yet - this is the earliest | |
3251 | moment at which we know its PID. */ | |
d90e17a7 | 3252 | if (ptid_is_pid (inferior_ptid)) |
f973ed9c | 3253 | { |
27c9d204 PA |
3254 | /* Upgrade the main thread's ptid. */ |
3255 | thread_change_ptid (inferior_ptid, | |
dfd4cc63 LM |
3256 | ptid_build (ptid_get_pid (inferior_ptid), |
3257 | ptid_get_pid (inferior_ptid), 0)); | |
27c9d204 | 3258 | |
26cb8b7c | 3259 | lp = add_initial_lwp (inferior_ptid); |
f973ed9c DJ |
3260 | lp->resumed = 1; |
3261 | } | |
3262 | ||
12696c10 | 3263 | /* Make sure SIGCHLD is blocked until the sigsuspend below. */ |
7feb7d06 | 3264 | block_child_signals (&prev_mask); |
d6b0e80f | 3265 | |
d6b0e80f | 3266 | /* First check if there is a LWP with a wait status pending. */ |
8a99810d PA |
3267 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
3268 | if (lp != NULL) | |
d6b0e80f AC |
3269 | { |
3270 | if (debug_linux_nat) | |
d6b0e80f AC |
3271 | fprintf_unfiltered (gdb_stdlog, |
3272 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3273 | status_to_str (lp->status), |
d6b0e80f | 3274 | target_pid_to_str (lp->ptid)); |
d6b0e80f AC |
3275 | } |
3276 | ||
9c02b525 PA |
3277 | /* But if we don't find a pending event, we'll have to wait. Always |
3278 | pull all events out of the kernel. We'll randomly select an | |
3279 | event LWP out of all that have events, to prevent starvation. */ | |
7feb7d06 | 3280 | |
d90e17a7 | 3281 | while (lp == NULL) |
d6b0e80f AC |
3282 | { |
3283 | pid_t lwpid; | |
3284 | ||
0e5bf2a8 PA |
3285 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
3286 | quirks: | |
3287 | ||
3288 | - If the thread group leader exits while other threads in the | |
3289 | thread group still exist, waitpid(TGID, ...) hangs. That | |
3290 | waitpid won't return an exit status until the other threads | |
3291 | in the group are reapped. | |
3292 | ||
3293 | - When a non-leader thread execs, that thread just vanishes | |
3294 | without reporting an exit (so we'd hang if we waited for it | |
3295 | explicitly in that case). The exec event is reported to | |
3296 | the TGID pid. */ | |
3297 | ||
3298 | errno = 0; | |
4a6ed09b | 3299 | lwpid = my_waitpid (-1, &status, __WALL | WNOHANG); |
0e5bf2a8 PA |
3300 | |
3301 | if (debug_linux_nat) | |
3302 | fprintf_unfiltered (gdb_stdlog, | |
3303 | "LNW: waitpid(-1, ...) returned %d, %s\n", | |
3304 | lwpid, errno ? safe_strerror (errno) : "ERRNO-OK"); | |
b84876c2 | 3305 | |
d6b0e80f AC |
3306 | if (lwpid > 0) |
3307 | { | |
d6b0e80f AC |
3308 | if (debug_linux_nat) |
3309 | { | |
3310 | fprintf_unfiltered (gdb_stdlog, | |
3311 | "LLW: waitpid %ld received %s\n", | |
3312 | (long) lwpid, status_to_str (status)); | |
3313 | } | |
3314 | ||
9c02b525 | 3315 | linux_nat_filter_event (lwpid, status); |
0e5bf2a8 PA |
3316 | /* Retry until nothing comes out of waitpid. A single |
3317 | SIGCHLD can indicate more than one child stopped. */ | |
3318 | continue; | |
d6b0e80f AC |
3319 | } |
3320 | ||
20ba1ce6 PA |
3321 | /* Now that we've pulled all events out of the kernel, resume |
3322 | LWPs that don't have an interesting event to report. */ | |
3323 | iterate_over_lwps (minus_one_ptid, | |
3324 | resume_stopped_resumed_lwps, &minus_one_ptid); | |
3325 | ||
3326 | /* ... and find an LWP with a status to report to the core, if | |
3327 | any. */ | |
9c02b525 PA |
3328 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
3329 | if (lp != NULL) | |
3330 | break; | |
3331 | ||
0e5bf2a8 PA |
3332 | /* Check for zombie thread group leaders. Those can't be reaped |
3333 | until all other threads in the thread group are. */ | |
3334 | check_zombie_leaders (); | |
d6b0e80f | 3335 | |
0e5bf2a8 PA |
3336 | /* If there are no resumed children left, bail. We'd be stuck |
3337 | forever in the sigsuspend call below otherwise. */ | |
3338 | if (iterate_over_lwps (ptid, resumed_callback, NULL) == NULL) | |
3339 | { | |
3340 | if (debug_linux_nat) | |
3341 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (no resumed LWP)\n"); | |
b84876c2 | 3342 | |
0e5bf2a8 | 3343 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
b84876c2 | 3344 | |
0e5bf2a8 PA |
3345 | restore_child_signals_mask (&prev_mask); |
3346 | return minus_one_ptid; | |
d6b0e80f | 3347 | } |
28736962 | 3348 | |
0e5bf2a8 PA |
3349 | /* No interesting event to report to the core. */ |
3350 | ||
3351 | if (target_options & TARGET_WNOHANG) | |
3352 | { | |
01124a23 | 3353 | if (debug_linux_nat) |
28736962 PA |
3354 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); |
3355 | ||
0e5bf2a8 | 3356 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
28736962 PA |
3357 | restore_child_signals_mask (&prev_mask); |
3358 | return minus_one_ptid; | |
3359 | } | |
d6b0e80f AC |
3360 | |
3361 | /* We shouldn't end up here unless we want to try again. */ | |
d90e17a7 | 3362 | gdb_assert (lp == NULL); |
0e5bf2a8 PA |
3363 | |
3364 | /* Block until we get an event reported with SIGCHLD. */ | |
d36bf488 DE |
3365 | if (debug_linux_nat) |
3366 | fprintf_unfiltered (gdb_stdlog, "LNW: about to sigsuspend\n"); | |
0e5bf2a8 | 3367 | sigsuspend (&suspend_mask); |
d6b0e80f AC |
3368 | } |
3369 | ||
d6b0e80f AC |
3370 | gdb_assert (lp); |
3371 | ||
ca2163eb PA |
3372 | status = lp->status; |
3373 | lp->status = 0; | |
3374 | ||
fbea99ea | 3375 | if (!target_is_non_stop_p ()) |
4c28f408 PA |
3376 | { |
3377 | /* Now stop all other LWP's ... */ | |
d90e17a7 | 3378 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); |
4c28f408 PA |
3379 | |
3380 | /* ... and wait until all of them have reported back that | |
3381 | they're no longer running. */ | |
d90e17a7 | 3382 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); |
9c02b525 PA |
3383 | } |
3384 | ||
3385 | /* If we're not waiting for a specific LWP, choose an event LWP from | |
3386 | among those that have had events. Giving equal priority to all | |
3387 | LWPs that have had events helps prevent starvation. */ | |
3388 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) | |
3389 | select_event_lwp (ptid, &lp, &status); | |
3390 | ||
3391 | gdb_assert (lp != NULL); | |
3392 | ||
3393 | /* Now that we've selected our final event LWP, un-adjust its PC if | |
faf09f01 PA |
3394 | it was a software breakpoint, and we can't reliably support the |
3395 | "stopped by software breakpoint" stop reason. */ | |
3396 | if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3397 | && !USE_SIGTRAP_SIGINFO) | |
9c02b525 PA |
3398 | { |
3399 | struct regcache *regcache = get_thread_regcache (lp->ptid); | |
3400 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
527a273a | 3401 | int decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
4c28f408 | 3402 | |
9c02b525 PA |
3403 | if (decr_pc != 0) |
3404 | { | |
3405 | CORE_ADDR pc; | |
d6b0e80f | 3406 | |
9c02b525 PA |
3407 | pc = regcache_read_pc (regcache); |
3408 | regcache_write_pc (regcache, pc + decr_pc); | |
3409 | } | |
3410 | } | |
e3e9f5a2 | 3411 | |
9c02b525 PA |
3412 | /* We'll need this to determine whether to report a SIGSTOP as |
3413 | GDB_SIGNAL_0. Need to take a copy because resume_clear_callback | |
3414 | clears it. */ | |
3415 | last_resume_kind = lp->last_resume_kind; | |
4b60df3d | 3416 | |
fbea99ea | 3417 | if (!target_is_non_stop_p ()) |
9c02b525 | 3418 | { |
e3e9f5a2 PA |
3419 | /* In all-stop, from the core's perspective, all LWPs are now |
3420 | stopped until a new resume action is sent over. */ | |
3421 | iterate_over_lwps (minus_one_ptid, resume_clear_callback, NULL); | |
3422 | } | |
3423 | else | |
25289eb2 | 3424 | { |
4b60df3d | 3425 | resume_clear_callback (lp, NULL); |
25289eb2 | 3426 | } |
d6b0e80f | 3427 | |
26ab7092 | 3428 | if (linux_nat_status_is_event (status)) |
d6b0e80f | 3429 | { |
d6b0e80f AC |
3430 | if (debug_linux_nat) |
3431 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
3432 | "LLW: trap ptid is %s.\n", |
3433 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 3434 | } |
d6b0e80f AC |
3435 | |
3436 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
3437 | { | |
3438 | *ourstatus = lp->waitstatus; | |
3439 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3440 | } | |
3441 | else | |
3442 | store_waitstatus (ourstatus, status); | |
3443 | ||
01124a23 | 3444 | if (debug_linux_nat) |
b84876c2 PA |
3445 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); |
3446 | ||
7feb7d06 | 3447 | restore_child_signals_mask (&prev_mask); |
1e225492 | 3448 | |
4b60df3d | 3449 | if (last_resume_kind == resume_stop |
25289eb2 PA |
3450 | && ourstatus->kind == TARGET_WAITKIND_STOPPED |
3451 | && WSTOPSIG (status) == SIGSTOP) | |
3452 | { | |
3453 | /* A thread that has been requested to stop by GDB with | |
3454 | target_stop, and it stopped cleanly, so report as SIG0. The | |
3455 | use of SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3456 | ourstatus->value.sig = GDB_SIGNAL_0; |
25289eb2 PA |
3457 | } |
3458 | ||
1e225492 JK |
3459 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
3460 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) | |
3461 | lp->core = -1; | |
3462 | else | |
2e794194 | 3463 | lp->core = linux_common_core_of_thread (lp->ptid); |
1e225492 | 3464 | |
aa01bd36 PA |
3465 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3466 | return filter_exit_event (lp, ourstatus); | |
3467 | ||
f973ed9c | 3468 | return lp->ptid; |
d6b0e80f AC |
3469 | } |
3470 | ||
e3e9f5a2 PA |
3471 | /* Resume LWPs that are currently stopped without any pending status |
3472 | to report, but are resumed from the core's perspective. */ | |
3473 | ||
3474 | static int | |
3475 | resume_stopped_resumed_lwps (struct lwp_info *lp, void *data) | |
3476 | { | |
9a3c8263 | 3477 | ptid_t *wait_ptid_p = (ptid_t *) data; |
e3e9f5a2 | 3478 | |
4dd63d48 PA |
3479 | if (!lp->stopped) |
3480 | { | |
3481 | if (debug_linux_nat) | |
3482 | fprintf_unfiltered (gdb_stdlog, | |
3483 | "RSRL: NOT resuming LWP %s, not stopped\n", | |
3484 | target_pid_to_str (lp->ptid)); | |
3485 | } | |
3486 | else if (!lp->resumed) | |
3487 | { | |
3488 | if (debug_linux_nat) | |
3489 | fprintf_unfiltered (gdb_stdlog, | |
3490 | "RSRL: NOT resuming LWP %s, not resumed\n", | |
3491 | target_pid_to_str (lp->ptid)); | |
3492 | } | |
3493 | else if (lwp_status_pending_p (lp)) | |
3494 | { | |
3495 | if (debug_linux_nat) | |
3496 | fprintf_unfiltered (gdb_stdlog, | |
3497 | "RSRL: NOT resuming LWP %s, has pending status\n", | |
3498 | target_pid_to_str (lp->ptid)); | |
3499 | } | |
3500 | else | |
e3e9f5a2 | 3501 | { |
336060f3 PA |
3502 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
3503 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
336060f3 | 3504 | |
23f238d3 | 3505 | TRY |
e3e9f5a2 | 3506 | { |
23f238d3 PA |
3507 | CORE_ADDR pc = regcache_read_pc (regcache); |
3508 | int leave_stopped = 0; | |
e3e9f5a2 | 3509 | |
23f238d3 PA |
3510 | /* Don't bother if there's a breakpoint at PC that we'd hit |
3511 | immediately, and we're not waiting for this LWP. */ | |
3512 | if (!ptid_match (lp->ptid, *wait_ptid_p)) | |
3513 | { | |
3514 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
3515 | leave_stopped = 1; | |
3516 | } | |
e3e9f5a2 | 3517 | |
23f238d3 PA |
3518 | if (!leave_stopped) |
3519 | { | |
3520 | if (debug_linux_nat) | |
3521 | fprintf_unfiltered (gdb_stdlog, | |
3522 | "RSRL: resuming stopped-resumed LWP %s at " | |
3523 | "%s: step=%d\n", | |
3524 | target_pid_to_str (lp->ptid), | |
3525 | paddress (gdbarch, pc), | |
3526 | lp->step); | |
3527 | ||
3528 | linux_resume_one_lwp_throw (lp, lp->step, GDB_SIGNAL_0); | |
3529 | } | |
3530 | } | |
3531 | CATCH (ex, RETURN_MASK_ERROR) | |
3532 | { | |
3533 | if (!check_ptrace_stopped_lwp_gone (lp)) | |
3534 | throw_exception (ex); | |
3535 | } | |
3536 | END_CATCH | |
e3e9f5a2 PA |
3537 | } |
3538 | ||
3539 | return 0; | |
3540 | } | |
3541 | ||
7feb7d06 PA |
3542 | static ptid_t |
3543 | linux_nat_wait (struct target_ops *ops, | |
47608cb1 PA |
3544 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3545 | int target_options) | |
7feb7d06 PA |
3546 | { |
3547 | ptid_t event_ptid; | |
3548 | ||
3549 | if (debug_linux_nat) | |
09826ec5 PA |
3550 | { |
3551 | char *options_string; | |
3552 | ||
3553 | options_string = target_options_to_string (target_options); | |
3554 | fprintf_unfiltered (gdb_stdlog, | |
3555 | "linux_nat_wait: [%s], [%s]\n", | |
3556 | target_pid_to_str (ptid), | |
3557 | options_string); | |
3558 | xfree (options_string); | |
3559 | } | |
7feb7d06 PA |
3560 | |
3561 | /* Flush the async file first. */ | |
d9d41e78 | 3562 | if (target_is_async_p ()) |
7feb7d06 PA |
3563 | async_file_flush (); |
3564 | ||
e3e9f5a2 PA |
3565 | /* Resume LWPs that are currently stopped without any pending status |
3566 | to report, but are resumed from the core's perspective. LWPs get | |
3567 | in this state if we find them stopping at a time we're not | |
3568 | interested in reporting the event (target_wait on a | |
3569 | specific_process, for example, see linux_nat_wait_1), and | |
3570 | meanwhile the event became uninteresting. Don't bother resuming | |
3571 | LWPs we're not going to wait for if they'd stop immediately. */ | |
fbea99ea | 3572 | if (target_is_non_stop_p ()) |
e3e9f5a2 PA |
3573 | iterate_over_lwps (minus_one_ptid, resume_stopped_resumed_lwps, &ptid); |
3574 | ||
47608cb1 | 3575 | event_ptid = linux_nat_wait_1 (ops, ptid, ourstatus, target_options); |
7feb7d06 PA |
3576 | |
3577 | /* If we requested any event, and something came out, assume there | |
3578 | may be more. If we requested a specific lwp or process, also | |
3579 | assume there may be more. */ | |
d9d41e78 | 3580 | if (target_is_async_p () |
6953d224 PA |
3581 | && ((ourstatus->kind != TARGET_WAITKIND_IGNORE |
3582 | && ourstatus->kind != TARGET_WAITKIND_NO_RESUMED) | |
7feb7d06 PA |
3583 | || !ptid_equal (ptid, minus_one_ptid))) |
3584 | async_file_mark (); | |
3585 | ||
7feb7d06 PA |
3586 | return event_ptid; |
3587 | } | |
3588 | ||
1d2736d4 PA |
3589 | /* Kill one LWP. */ |
3590 | ||
3591 | static void | |
3592 | kill_one_lwp (pid_t pid) | |
d6b0e80f | 3593 | { |
ed731959 JK |
3594 | /* PTRACE_KILL may resume the inferior. Send SIGKILL first. */ |
3595 | ||
3596 | errno = 0; | |
1d2736d4 | 3597 | kill_lwp (pid, SIGKILL); |
ed731959 | 3598 | if (debug_linux_nat) |
57745c90 PA |
3599 | { |
3600 | int save_errno = errno; | |
3601 | ||
3602 | fprintf_unfiltered (gdb_stdlog, | |
1d2736d4 | 3603 | "KC: kill (SIGKILL) %ld, 0, 0 (%s)\n", (long) pid, |
57745c90 PA |
3604 | save_errno ? safe_strerror (save_errno) : "OK"); |
3605 | } | |
ed731959 JK |
3606 | |
3607 | /* Some kernels ignore even SIGKILL for processes under ptrace. */ | |
3608 | ||
d6b0e80f | 3609 | errno = 0; |
1d2736d4 | 3610 | ptrace (PTRACE_KILL, pid, 0, 0); |
d6b0e80f | 3611 | if (debug_linux_nat) |
57745c90 PA |
3612 | { |
3613 | int save_errno = errno; | |
3614 | ||
3615 | fprintf_unfiltered (gdb_stdlog, | |
1d2736d4 | 3616 | "KC: PTRACE_KILL %ld, 0, 0 (%s)\n", (long) pid, |
57745c90 PA |
3617 | save_errno ? safe_strerror (save_errno) : "OK"); |
3618 | } | |
d6b0e80f AC |
3619 | } |
3620 | ||
1d2736d4 PA |
3621 | /* Wait for an LWP to die. */ |
3622 | ||
3623 | static void | |
3624 | kill_wait_one_lwp (pid_t pid) | |
d6b0e80f | 3625 | { |
1d2736d4 | 3626 | pid_t res; |
d6b0e80f AC |
3627 | |
3628 | /* We must make sure that there are no pending events (delayed | |
3629 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
3630 | program doesn't interfere with any following debugging session. */ | |
3631 | ||
d6b0e80f AC |
3632 | do |
3633 | { | |
1d2736d4 PA |
3634 | res = my_waitpid (pid, NULL, __WALL); |
3635 | if (res != (pid_t) -1) | |
d6b0e80f | 3636 | { |
e85a822c DJ |
3637 | if (debug_linux_nat) |
3638 | fprintf_unfiltered (gdb_stdlog, | |
1d2736d4 PA |
3639 | "KWC: wait %ld received unknown.\n", |
3640 | (long) pid); | |
4a6ed09b PA |
3641 | /* The Linux kernel sometimes fails to kill a thread |
3642 | completely after PTRACE_KILL; that goes from the stop | |
3643 | point in do_fork out to the one in get_signal_to_deliver | |
3644 | and waits again. So kill it again. */ | |
1d2736d4 | 3645 | kill_one_lwp (pid); |
d6b0e80f AC |
3646 | } |
3647 | } | |
1d2736d4 PA |
3648 | while (res == pid); |
3649 | ||
3650 | gdb_assert (res == -1 && errno == ECHILD); | |
3651 | } | |
3652 | ||
3653 | /* Callback for iterate_over_lwps. */ | |
d6b0e80f | 3654 | |
1d2736d4 PA |
3655 | static int |
3656 | kill_callback (struct lwp_info *lp, void *data) | |
3657 | { | |
3658 | kill_one_lwp (ptid_get_lwp (lp->ptid)); | |
d6b0e80f AC |
3659 | return 0; |
3660 | } | |
3661 | ||
1d2736d4 PA |
3662 | /* Callback for iterate_over_lwps. */ |
3663 | ||
3664 | static int | |
3665 | kill_wait_callback (struct lwp_info *lp, void *data) | |
3666 | { | |
3667 | kill_wait_one_lwp (ptid_get_lwp (lp->ptid)); | |
3668 | return 0; | |
3669 | } | |
3670 | ||
3671 | /* Kill the fork children of any threads of inferior INF that are | |
3672 | stopped at a fork event. */ | |
3673 | ||
3674 | static void | |
3675 | kill_unfollowed_fork_children (struct inferior *inf) | |
3676 | { | |
3677 | struct thread_info *thread; | |
3678 | ||
3679 | ALL_NON_EXITED_THREADS (thread) | |
3680 | if (thread->inf == inf) | |
3681 | { | |
3682 | struct target_waitstatus *ws = &thread->pending_follow; | |
3683 | ||
3684 | if (ws->kind == TARGET_WAITKIND_FORKED | |
3685 | || ws->kind == TARGET_WAITKIND_VFORKED) | |
3686 | { | |
3687 | ptid_t child_ptid = ws->value.related_pid; | |
3688 | int child_pid = ptid_get_pid (child_ptid); | |
3689 | int child_lwp = ptid_get_lwp (child_ptid); | |
1d2736d4 PA |
3690 | |
3691 | kill_one_lwp (child_lwp); | |
3692 | kill_wait_one_lwp (child_lwp); | |
3693 | ||
3694 | /* Let the arch-specific native code know this process is | |
3695 | gone. */ | |
3696 | linux_nat_forget_process (child_pid); | |
3697 | } | |
3698 | } | |
3699 | } | |
3700 | ||
d6b0e80f | 3701 | static void |
7d85a9c0 | 3702 | linux_nat_kill (struct target_ops *ops) |
d6b0e80f | 3703 | { |
f973ed9c DJ |
3704 | /* If we're stopped while forking and we haven't followed yet, |
3705 | kill the other task. We need to do this first because the | |
3706 | parent will be sleeping if this is a vfork. */ | |
1d2736d4 | 3707 | kill_unfollowed_fork_children (current_inferior ()); |
f973ed9c DJ |
3708 | |
3709 | if (forks_exist_p ()) | |
7feb7d06 | 3710 | linux_fork_killall (); |
f973ed9c DJ |
3711 | else |
3712 | { | |
d90e17a7 | 3713 | ptid_t ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
e0881a8e | 3714 | |
4c28f408 PA |
3715 | /* Stop all threads before killing them, since ptrace requires |
3716 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
d90e17a7 | 3717 | iterate_over_lwps (ptid, stop_callback, NULL); |
4c28f408 PA |
3718 | /* ... and wait until all of them have reported back that |
3719 | they're no longer running. */ | |
d90e17a7 | 3720 | iterate_over_lwps (ptid, stop_wait_callback, NULL); |
4c28f408 | 3721 | |
f973ed9c | 3722 | /* Kill all LWP's ... */ |
d90e17a7 | 3723 | iterate_over_lwps (ptid, kill_callback, NULL); |
f973ed9c DJ |
3724 | |
3725 | /* ... and wait until we've flushed all events. */ | |
d90e17a7 | 3726 | iterate_over_lwps (ptid, kill_wait_callback, NULL); |
f973ed9c DJ |
3727 | } |
3728 | ||
3729 | target_mourn_inferior (); | |
d6b0e80f AC |
3730 | } |
3731 | ||
3732 | static void | |
136d6dae | 3733 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 3734 | { |
26cb8b7c PA |
3735 | int pid = ptid_get_pid (inferior_ptid); |
3736 | ||
3737 | purge_lwp_list (pid); | |
d6b0e80f | 3738 | |
f973ed9c | 3739 | if (! forks_exist_p ()) |
d90e17a7 PA |
3740 | /* Normal case, no other forks available. */ |
3741 | linux_ops->to_mourn_inferior (ops); | |
f973ed9c DJ |
3742 | else |
3743 | /* Multi-fork case. The current inferior_ptid has exited, but | |
3744 | there are other viable forks to debug. Delete the exiting | |
3745 | one and context-switch to the first available. */ | |
3746 | linux_fork_mourn_inferior (); | |
26cb8b7c PA |
3747 | |
3748 | /* Let the arch-specific native code know this process is gone. */ | |
3749 | linux_nat_forget_process (pid); | |
d6b0e80f AC |
3750 | } |
3751 | ||
5b009018 PA |
3752 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3753 | layout of the inferiors' architecture. */ | |
3754 | ||
3755 | static void | |
a5362b9a | 3756 | siginfo_fixup (siginfo_t *siginfo, gdb_byte *inf_siginfo, int direction) |
5b009018 PA |
3757 | { |
3758 | int done = 0; | |
3759 | ||
3760 | if (linux_nat_siginfo_fixup != NULL) | |
3761 | done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction); | |
3762 | ||
3763 | /* If there was no callback, or the callback didn't do anything, | |
3764 | then just do a straight memcpy. */ | |
3765 | if (!done) | |
3766 | { | |
3767 | if (direction == 1) | |
a5362b9a | 3768 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
5b009018 | 3769 | else |
a5362b9a | 3770 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
5b009018 PA |
3771 | } |
3772 | } | |
3773 | ||
9b409511 | 3774 | static enum target_xfer_status |
4aa995e1 PA |
3775 | linux_xfer_siginfo (struct target_ops *ops, enum target_object object, |
3776 | const char *annex, gdb_byte *readbuf, | |
9b409511 YQ |
3777 | const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, |
3778 | ULONGEST *xfered_len) | |
4aa995e1 | 3779 | { |
4aa995e1 | 3780 | int pid; |
a5362b9a TS |
3781 | siginfo_t siginfo; |
3782 | gdb_byte inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 PA |
3783 | |
3784 | gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO); | |
3785 | gdb_assert (readbuf || writebuf); | |
3786 | ||
dfd4cc63 | 3787 | pid = ptid_get_lwp (inferior_ptid); |
4aa995e1 | 3788 | if (pid == 0) |
dfd4cc63 | 3789 | pid = ptid_get_pid (inferior_ptid); |
4aa995e1 PA |
3790 | |
3791 | if (offset > sizeof (siginfo)) | |
2ed4b548 | 3792 | return TARGET_XFER_E_IO; |
4aa995e1 PA |
3793 | |
3794 | errno = 0; | |
3795 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3796 | if (errno != 0) | |
2ed4b548 | 3797 | return TARGET_XFER_E_IO; |
4aa995e1 | 3798 | |
5b009018 PA |
3799 | /* When GDB is built as a 64-bit application, ptrace writes into |
3800 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
3801 | inferior with a 64-bit GDB should look the same as debugging it | |
3802 | with a 32-bit GDB, we need to convert it. GDB core always sees | |
3803 | the converted layout, so any read/write will have to be done | |
3804 | post-conversion. */ | |
3805 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
3806 | ||
4aa995e1 PA |
3807 | if (offset + len > sizeof (siginfo)) |
3808 | len = sizeof (siginfo) - offset; | |
3809 | ||
3810 | if (readbuf != NULL) | |
5b009018 | 3811 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
3812 | else |
3813 | { | |
5b009018 PA |
3814 | memcpy (inf_siginfo + offset, writebuf, len); |
3815 | ||
3816 | /* Convert back to ptrace layout before flushing it out. */ | |
3817 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
3818 | ||
4aa995e1 PA |
3819 | errno = 0; |
3820 | ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3821 | if (errno != 0) | |
2ed4b548 | 3822 | return TARGET_XFER_E_IO; |
4aa995e1 PA |
3823 | } |
3824 | ||
9b409511 YQ |
3825 | *xfered_len = len; |
3826 | return TARGET_XFER_OK; | |
4aa995e1 PA |
3827 | } |
3828 | ||
9b409511 | 3829 | static enum target_xfer_status |
10d6c8cd DJ |
3830 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, |
3831 | const char *annex, gdb_byte *readbuf, | |
3832 | const gdb_byte *writebuf, | |
9b409511 | 3833 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
d6b0e80f | 3834 | { |
4aa995e1 | 3835 | struct cleanup *old_chain; |
9b409511 | 3836 | enum target_xfer_status xfer; |
d6b0e80f | 3837 | |
4aa995e1 PA |
3838 | if (object == TARGET_OBJECT_SIGNAL_INFO) |
3839 | return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf, | |
9b409511 | 3840 | offset, len, xfered_len); |
4aa995e1 | 3841 | |
c35b1492 PA |
3842 | /* The target is connected but no live inferior is selected. Pass |
3843 | this request down to a lower stratum (e.g., the executable | |
3844 | file). */ | |
3845 | if (object == TARGET_OBJECT_MEMORY && ptid_equal (inferior_ptid, null_ptid)) | |
9b409511 | 3846 | return TARGET_XFER_EOF; |
c35b1492 | 3847 | |
4aa995e1 PA |
3848 | old_chain = save_inferior_ptid (); |
3849 | ||
dfd4cc63 LM |
3850 | if (ptid_lwp_p (inferior_ptid)) |
3851 | inferior_ptid = pid_to_ptid (ptid_get_lwp (inferior_ptid)); | |
d6b0e80f | 3852 | |
10d6c8cd | 3853 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
9b409511 | 3854 | offset, len, xfered_len); |
d6b0e80f AC |
3855 | |
3856 | do_cleanups (old_chain); | |
3857 | return xfer; | |
3858 | } | |
3859 | ||
28439f5e PA |
3860 | static int |
3861 | linux_nat_thread_alive (struct target_ops *ops, ptid_t ptid) | |
3862 | { | |
4a6ed09b PA |
3863 | /* As long as a PTID is in lwp list, consider it alive. */ |
3864 | return find_lwp_pid (ptid) != NULL; | |
28439f5e PA |
3865 | } |
3866 | ||
8a06aea7 PA |
3867 | /* Implement the to_update_thread_list target method for this |
3868 | target. */ | |
3869 | ||
3870 | static void | |
3871 | linux_nat_update_thread_list (struct target_ops *ops) | |
3872 | { | |
a6904d5a PA |
3873 | struct lwp_info *lwp; |
3874 | ||
4a6ed09b PA |
3875 | /* We add/delete threads from the list as clone/exit events are |
3876 | processed, so just try deleting exited threads still in the | |
3877 | thread list. */ | |
3878 | delete_exited_threads (); | |
a6904d5a PA |
3879 | |
3880 | /* Update the processor core that each lwp/thread was last seen | |
3881 | running on. */ | |
3882 | ALL_LWPS (lwp) | |
1ad3de98 PA |
3883 | { |
3884 | /* Avoid accessing /proc if the thread hasn't run since we last | |
3885 | time we fetched the thread's core. Accessing /proc becomes | |
3886 | noticeably expensive when we have thousands of LWPs. */ | |
3887 | if (lwp->core == -1) | |
3888 | lwp->core = linux_common_core_of_thread (lwp->ptid); | |
3889 | } | |
8a06aea7 PA |
3890 | } |
3891 | ||
d6b0e80f | 3892 | static char * |
117de6a9 | 3893 | linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid) |
d6b0e80f AC |
3894 | { |
3895 | static char buf[64]; | |
3896 | ||
dfd4cc63 LM |
3897 | if (ptid_lwp_p (ptid) |
3898 | && (ptid_get_pid (ptid) != ptid_get_lwp (ptid) | |
3899 | || num_lwps (ptid_get_pid (ptid)) > 1)) | |
d6b0e80f | 3900 | { |
dfd4cc63 | 3901 | snprintf (buf, sizeof (buf), "LWP %ld", ptid_get_lwp (ptid)); |
d6b0e80f AC |
3902 | return buf; |
3903 | } | |
3904 | ||
3905 | return normal_pid_to_str (ptid); | |
3906 | } | |
3907 | ||
73ede765 | 3908 | static const char * |
503a628d | 3909 | linux_nat_thread_name (struct target_ops *self, struct thread_info *thr) |
4694da01 | 3910 | { |
79efa585 | 3911 | return linux_proc_tid_get_name (thr->ptid); |
4694da01 TT |
3912 | } |
3913 | ||
dba24537 AC |
3914 | /* Accepts an integer PID; Returns a string representing a file that |
3915 | can be opened to get the symbols for the child process. */ | |
3916 | ||
6d8fd2b7 | 3917 | static char * |
8dd27370 | 3918 | linux_child_pid_to_exec_file (struct target_ops *self, int pid) |
dba24537 | 3919 | { |
e0d86d2c | 3920 | return linux_proc_pid_to_exec_file (pid); |
dba24537 AC |
3921 | } |
3922 | ||
10d6c8cd DJ |
3923 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
3924 | filesystem. Because we can use a single read() call for /proc, this | |
3925 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
3926 | but it doesn't support writes. */ | |
3927 | ||
9b409511 | 3928 | static enum target_xfer_status |
10d6c8cd DJ |
3929 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, |
3930 | const char *annex, gdb_byte *readbuf, | |
3931 | const gdb_byte *writebuf, | |
9b409511 | 3932 | ULONGEST offset, LONGEST len, ULONGEST *xfered_len) |
dba24537 | 3933 | { |
10d6c8cd DJ |
3934 | LONGEST ret; |
3935 | int fd; | |
dba24537 AC |
3936 | char filename[64]; |
3937 | ||
10d6c8cd | 3938 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
f486487f | 3939 | return TARGET_XFER_EOF; |
dba24537 AC |
3940 | |
3941 | /* Don't bother for one word. */ | |
3942 | if (len < 3 * sizeof (long)) | |
9b409511 | 3943 | return TARGET_XFER_EOF; |
dba24537 AC |
3944 | |
3945 | /* We could keep this file open and cache it - possibly one per | |
3946 | thread. That requires some juggling, but is even faster. */ | |
cde33bf1 YQ |
3947 | xsnprintf (filename, sizeof filename, "/proc/%d/mem", |
3948 | ptid_get_pid (inferior_ptid)); | |
614c279d | 3949 | fd = gdb_open_cloexec (filename, O_RDONLY | O_LARGEFILE, 0); |
dba24537 | 3950 | if (fd == -1) |
9b409511 | 3951 | return TARGET_XFER_EOF; |
dba24537 AC |
3952 | |
3953 | /* If pread64 is available, use it. It's faster if the kernel | |
3954 | supports it (only one syscall), and it's 64-bit safe even on | |
3955 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
3956 | application). */ | |
3957 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 3958 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 3959 | #else |
10d6c8cd | 3960 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
3961 | #endif |
3962 | ret = 0; | |
3963 | else | |
3964 | ret = len; | |
3965 | ||
3966 | close (fd); | |
9b409511 YQ |
3967 | |
3968 | if (ret == 0) | |
3969 | return TARGET_XFER_EOF; | |
3970 | else | |
3971 | { | |
3972 | *xfered_len = ret; | |
3973 | return TARGET_XFER_OK; | |
3974 | } | |
dba24537 AC |
3975 | } |
3976 | ||
efcbbd14 UW |
3977 | |
3978 | /* Enumerate spufs IDs for process PID. */ | |
3979 | static LONGEST | |
b55e14c7 | 3980 | spu_enumerate_spu_ids (int pid, gdb_byte *buf, ULONGEST offset, ULONGEST len) |
efcbbd14 | 3981 | { |
f5656ead | 3982 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
efcbbd14 UW |
3983 | LONGEST pos = 0; |
3984 | LONGEST written = 0; | |
3985 | char path[128]; | |
3986 | DIR *dir; | |
3987 | struct dirent *entry; | |
3988 | ||
3989 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
3990 | dir = opendir (path); | |
3991 | if (!dir) | |
3992 | return -1; | |
3993 | ||
3994 | rewinddir (dir); | |
3995 | while ((entry = readdir (dir)) != NULL) | |
3996 | { | |
3997 | struct stat st; | |
3998 | struct statfs stfs; | |
3999 | int fd; | |
4000 | ||
4001 | fd = atoi (entry->d_name); | |
4002 | if (!fd) | |
4003 | continue; | |
4004 | ||
4005 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4006 | if (stat (path, &st) != 0) | |
4007 | continue; | |
4008 | if (!S_ISDIR (st.st_mode)) | |
4009 | continue; | |
4010 | ||
4011 | if (statfs (path, &stfs) != 0) | |
4012 | continue; | |
4013 | if (stfs.f_type != SPUFS_MAGIC) | |
4014 | continue; | |
4015 | ||
4016 | if (pos >= offset && pos + 4 <= offset + len) | |
4017 | { | |
4018 | store_unsigned_integer (buf + pos - offset, 4, byte_order, fd); | |
4019 | written += 4; | |
4020 | } | |
4021 | pos += 4; | |
4022 | } | |
4023 | ||
4024 | closedir (dir); | |
4025 | return written; | |
4026 | } | |
4027 | ||
4028 | /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4029 | object type, using the /proc file system. */ | |
9b409511 YQ |
4030 | |
4031 | static enum target_xfer_status | |
efcbbd14 UW |
4032 | linux_proc_xfer_spu (struct target_ops *ops, enum target_object object, |
4033 | const char *annex, gdb_byte *readbuf, | |
4034 | const gdb_byte *writebuf, | |
9b409511 | 4035 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
efcbbd14 UW |
4036 | { |
4037 | char buf[128]; | |
4038 | int fd = 0; | |
4039 | int ret = -1; | |
dfd4cc63 | 4040 | int pid = ptid_get_pid (inferior_ptid); |
efcbbd14 UW |
4041 | |
4042 | if (!annex) | |
4043 | { | |
4044 | if (!readbuf) | |
2ed4b548 | 4045 | return TARGET_XFER_E_IO; |
efcbbd14 | 4046 | else |
9b409511 YQ |
4047 | { |
4048 | LONGEST l = spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4049 | ||
4050 | if (l < 0) | |
4051 | return TARGET_XFER_E_IO; | |
4052 | else if (l == 0) | |
4053 | return TARGET_XFER_EOF; | |
4054 | else | |
4055 | { | |
4056 | *xfered_len = (ULONGEST) l; | |
4057 | return TARGET_XFER_OK; | |
4058 | } | |
4059 | } | |
efcbbd14 UW |
4060 | } |
4061 | ||
4062 | xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex); | |
614c279d | 4063 | fd = gdb_open_cloexec (buf, writebuf? O_WRONLY : O_RDONLY, 0); |
efcbbd14 | 4064 | if (fd <= 0) |
2ed4b548 | 4065 | return TARGET_XFER_E_IO; |
efcbbd14 UW |
4066 | |
4067 | if (offset != 0 | |
4068 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4069 | { | |
4070 | close (fd); | |
9b409511 | 4071 | return TARGET_XFER_EOF; |
efcbbd14 UW |
4072 | } |
4073 | ||
4074 | if (writebuf) | |
4075 | ret = write (fd, writebuf, (size_t) len); | |
4076 | else if (readbuf) | |
4077 | ret = read (fd, readbuf, (size_t) len); | |
4078 | ||
4079 | close (fd); | |
9b409511 YQ |
4080 | |
4081 | if (ret < 0) | |
4082 | return TARGET_XFER_E_IO; | |
4083 | else if (ret == 0) | |
4084 | return TARGET_XFER_EOF; | |
4085 | else | |
4086 | { | |
4087 | *xfered_len = (ULONGEST) ret; | |
4088 | return TARGET_XFER_OK; | |
4089 | } | |
efcbbd14 UW |
4090 | } |
4091 | ||
4092 | ||
dba24537 AC |
4093 | /* Parse LINE as a signal set and add its set bits to SIGS. */ |
4094 | ||
4095 | static void | |
4096 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
4097 | { | |
4098 | int len = strlen (line) - 1; | |
4099 | const char *p; | |
4100 | int signum; | |
4101 | ||
4102 | if (line[len] != '\n') | |
8a3fe4f8 | 4103 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4104 | |
4105 | p = line; | |
4106 | signum = len * 4; | |
4107 | while (len-- > 0) | |
4108 | { | |
4109 | int digit; | |
4110 | ||
4111 | if (*p >= '0' && *p <= '9') | |
4112 | digit = *p - '0'; | |
4113 | else if (*p >= 'a' && *p <= 'f') | |
4114 | digit = *p - 'a' + 10; | |
4115 | else | |
8a3fe4f8 | 4116 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4117 | |
4118 | signum -= 4; | |
4119 | ||
4120 | if (digit & 1) | |
4121 | sigaddset (sigs, signum + 1); | |
4122 | if (digit & 2) | |
4123 | sigaddset (sigs, signum + 2); | |
4124 | if (digit & 4) | |
4125 | sigaddset (sigs, signum + 3); | |
4126 | if (digit & 8) | |
4127 | sigaddset (sigs, signum + 4); | |
4128 | ||
4129 | p++; | |
4130 | } | |
4131 | } | |
4132 | ||
4133 | /* Find process PID's pending signals from /proc/pid/status and set | |
4134 | SIGS to match. */ | |
4135 | ||
4136 | void | |
3e43a32a MS |
4137 | linux_proc_pending_signals (int pid, sigset_t *pending, |
4138 | sigset_t *blocked, sigset_t *ignored) | |
dba24537 AC |
4139 | { |
4140 | FILE *procfile; | |
d8d2a3ee | 4141 | char buffer[PATH_MAX], fname[PATH_MAX]; |
7c8a8b04 | 4142 | struct cleanup *cleanup; |
dba24537 AC |
4143 | |
4144 | sigemptyset (pending); | |
4145 | sigemptyset (blocked); | |
4146 | sigemptyset (ignored); | |
cde33bf1 | 4147 | xsnprintf (fname, sizeof fname, "/proc/%d/status", pid); |
614c279d | 4148 | procfile = gdb_fopen_cloexec (fname, "r"); |
dba24537 | 4149 | if (procfile == NULL) |
8a3fe4f8 | 4150 | error (_("Could not open %s"), fname); |
7c8a8b04 | 4151 | cleanup = make_cleanup_fclose (procfile); |
dba24537 | 4152 | |
d8d2a3ee | 4153 | while (fgets (buffer, PATH_MAX, procfile) != NULL) |
dba24537 AC |
4154 | { |
4155 | /* Normal queued signals are on the SigPnd line in the status | |
4156 | file. However, 2.6 kernels also have a "shared" pending | |
4157 | queue for delivering signals to a thread group, so check for | |
4158 | a ShdPnd line also. | |
4159 | ||
4160 | Unfortunately some Red Hat kernels include the shared pending | |
4161 | queue but not the ShdPnd status field. */ | |
4162 | ||
61012eef | 4163 | if (startswith (buffer, "SigPnd:\t")) |
dba24537 | 4164 | add_line_to_sigset (buffer + 8, pending); |
61012eef | 4165 | else if (startswith (buffer, "ShdPnd:\t")) |
dba24537 | 4166 | add_line_to_sigset (buffer + 8, pending); |
61012eef | 4167 | else if (startswith (buffer, "SigBlk:\t")) |
dba24537 | 4168 | add_line_to_sigset (buffer + 8, blocked); |
61012eef | 4169 | else if (startswith (buffer, "SigIgn:\t")) |
dba24537 AC |
4170 | add_line_to_sigset (buffer + 8, ignored); |
4171 | } | |
4172 | ||
7c8a8b04 | 4173 | do_cleanups (cleanup); |
dba24537 AC |
4174 | } |
4175 | ||
9b409511 | 4176 | static enum target_xfer_status |
07e059b5 | 4177 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, |
e0881a8e | 4178 | const char *annex, gdb_byte *readbuf, |
9b409511 YQ |
4179 | const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, |
4180 | ULONGEST *xfered_len) | |
07e059b5 | 4181 | { |
07e059b5 VP |
4182 | gdb_assert (object == TARGET_OBJECT_OSDATA); |
4183 | ||
9b409511 YQ |
4184 | *xfered_len = linux_common_xfer_osdata (annex, readbuf, offset, len); |
4185 | if (*xfered_len == 0) | |
4186 | return TARGET_XFER_EOF; | |
4187 | else | |
4188 | return TARGET_XFER_OK; | |
07e059b5 VP |
4189 | } |
4190 | ||
9b409511 | 4191 | static enum target_xfer_status |
10d6c8cd DJ |
4192 | linux_xfer_partial (struct target_ops *ops, enum target_object object, |
4193 | const char *annex, gdb_byte *readbuf, | |
9b409511 YQ |
4194 | const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, |
4195 | ULONGEST *xfered_len) | |
10d6c8cd | 4196 | { |
9b409511 | 4197 | enum target_xfer_status xfer; |
10d6c8cd DJ |
4198 | |
4199 | if (object == TARGET_OBJECT_AUXV) | |
9f2982ff | 4200 | return memory_xfer_auxv (ops, object, annex, readbuf, writebuf, |
9b409511 | 4201 | offset, len, xfered_len); |
10d6c8cd | 4202 | |
07e059b5 VP |
4203 | if (object == TARGET_OBJECT_OSDATA) |
4204 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
9b409511 | 4205 | offset, len, xfered_len); |
07e059b5 | 4206 | |
efcbbd14 UW |
4207 | if (object == TARGET_OBJECT_SPU) |
4208 | return linux_proc_xfer_spu (ops, object, annex, readbuf, writebuf, | |
9b409511 | 4209 | offset, len, xfered_len); |
efcbbd14 | 4210 | |
8f313923 JK |
4211 | /* GDB calculates all the addresses in possibly larget width of the address. |
4212 | Address width needs to be masked before its final use - either by | |
4213 | linux_proc_xfer_partial or inf_ptrace_xfer_partial. | |
4214 | ||
4215 | Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */ | |
4216 | ||
4217 | if (object == TARGET_OBJECT_MEMORY) | |
4218 | { | |
f5656ead | 4219 | int addr_bit = gdbarch_addr_bit (target_gdbarch ()); |
8f313923 JK |
4220 | |
4221 | if (addr_bit < (sizeof (ULONGEST) * HOST_CHAR_BIT)) | |
4222 | offset &= ((ULONGEST) 1 << addr_bit) - 1; | |
4223 | } | |
4224 | ||
10d6c8cd | 4225 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
9b409511 YQ |
4226 | offset, len, xfered_len); |
4227 | if (xfer != TARGET_XFER_EOF) | |
10d6c8cd DJ |
4228 | return xfer; |
4229 | ||
4230 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
9b409511 | 4231 | offset, len, xfered_len); |
10d6c8cd DJ |
4232 | } |
4233 | ||
5808517f YQ |
4234 | static void |
4235 | cleanup_target_stop (void *arg) | |
4236 | { | |
4237 | ptid_t *ptid = (ptid_t *) arg; | |
4238 | ||
4239 | gdb_assert (arg != NULL); | |
4240 | ||
4241 | /* Unpause all */ | |
a493e3e2 | 4242 | target_resume (*ptid, 0, GDB_SIGNAL_0); |
5808517f YQ |
4243 | } |
4244 | ||
4245 | static VEC(static_tracepoint_marker_p) * | |
c686c57f TT |
4246 | linux_child_static_tracepoint_markers_by_strid (struct target_ops *self, |
4247 | const char *strid) | |
5808517f YQ |
4248 | { |
4249 | char s[IPA_CMD_BUF_SIZE]; | |
4250 | struct cleanup *old_chain; | |
4251 | int pid = ptid_get_pid (inferior_ptid); | |
4252 | VEC(static_tracepoint_marker_p) *markers = NULL; | |
4253 | struct static_tracepoint_marker *marker = NULL; | |
4254 | char *p = s; | |
4255 | ptid_t ptid = ptid_build (pid, 0, 0); | |
4256 | ||
4257 | /* Pause all */ | |
4258 | target_stop (ptid); | |
4259 | ||
4260 | memcpy (s, "qTfSTM", sizeof ("qTfSTM")); | |
4261 | s[sizeof ("qTfSTM")] = 0; | |
4262 | ||
42476b70 | 4263 | agent_run_command (pid, s, strlen (s) + 1); |
5808517f YQ |
4264 | |
4265 | old_chain = make_cleanup (free_current_marker, &marker); | |
4266 | make_cleanup (cleanup_target_stop, &ptid); | |
4267 | ||
4268 | while (*p++ == 'm') | |
4269 | { | |
4270 | if (marker == NULL) | |
4271 | marker = XCNEW (struct static_tracepoint_marker); | |
4272 | ||
4273 | do | |
4274 | { | |
4275 | parse_static_tracepoint_marker_definition (p, &p, marker); | |
4276 | ||
4277 | if (strid == NULL || strcmp (strid, marker->str_id) == 0) | |
4278 | { | |
4279 | VEC_safe_push (static_tracepoint_marker_p, | |
4280 | markers, marker); | |
4281 | marker = NULL; | |
4282 | } | |
4283 | else | |
4284 | { | |
4285 | release_static_tracepoint_marker (marker); | |
4286 | memset (marker, 0, sizeof (*marker)); | |
4287 | } | |
4288 | } | |
4289 | while (*p++ == ','); /* comma-separated list */ | |
4290 | ||
4291 | memcpy (s, "qTsSTM", sizeof ("qTsSTM")); | |
4292 | s[sizeof ("qTsSTM")] = 0; | |
42476b70 | 4293 | agent_run_command (pid, s, strlen (s) + 1); |
5808517f YQ |
4294 | p = s; |
4295 | } | |
4296 | ||
4297 | do_cleanups (old_chain); | |
4298 | ||
4299 | return markers; | |
4300 | } | |
4301 | ||
e9efe249 | 4302 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
4303 | it with local methods. */ |
4304 | ||
910122bf UW |
4305 | static void |
4306 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 4307 | { |
6d8fd2b7 | 4308 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
eb73ad13 | 4309 | t->to_remove_fork_catchpoint = linux_child_remove_fork_catchpoint; |
6d8fd2b7 | 4310 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; |
eb73ad13 | 4311 | t->to_remove_vfork_catchpoint = linux_child_remove_vfork_catchpoint; |
6d8fd2b7 | 4312 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; |
eb73ad13 | 4313 | t->to_remove_exec_catchpoint = linux_child_remove_exec_catchpoint; |
a96d9b2e | 4314 | t->to_set_syscall_catchpoint = linux_child_set_syscall_catchpoint; |
6d8fd2b7 | 4315 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; |
10d6c8cd | 4316 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
4317 | t->to_post_attach = linux_child_post_attach; |
4318 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
4319 | |
4320 | super_xfer_partial = t->to_xfer_partial; | |
4321 | t->to_xfer_partial = linux_xfer_partial; | |
5808517f YQ |
4322 | |
4323 | t->to_static_tracepoint_markers_by_strid | |
4324 | = linux_child_static_tracepoint_markers_by_strid; | |
910122bf UW |
4325 | } |
4326 | ||
4327 | struct target_ops * | |
4328 | linux_target (void) | |
4329 | { | |
4330 | struct target_ops *t; | |
4331 | ||
4332 | t = inf_ptrace_target (); | |
4333 | linux_target_install_ops (t); | |
4334 | ||
4335 | return t; | |
4336 | } | |
4337 | ||
4338 | struct target_ops * | |
7714d83a | 4339 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
4340 | { |
4341 | struct target_ops *t; | |
4342 | ||
4343 | t = inf_ptrace_trad_target (register_u_offset); | |
4344 | linux_target_install_ops (t); | |
10d6c8cd | 4345 | |
10d6c8cd DJ |
4346 | return t; |
4347 | } | |
4348 | ||
b84876c2 PA |
4349 | /* target_is_async_p implementation. */ |
4350 | ||
4351 | static int | |
6a109b6b | 4352 | linux_nat_is_async_p (struct target_ops *ops) |
b84876c2 | 4353 | { |
198297aa | 4354 | return linux_is_async_p (); |
b84876c2 PA |
4355 | } |
4356 | ||
4357 | /* target_can_async_p implementation. */ | |
4358 | ||
4359 | static int | |
6a109b6b | 4360 | linux_nat_can_async_p (struct target_ops *ops) |
b84876c2 PA |
4361 | { |
4362 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 4363 | it explicitly with the "set target-async" command. |
b84876c2 | 4364 | Someday, linux will always be async. */ |
3dd5b83d | 4365 | return target_async_permitted; |
b84876c2 PA |
4366 | } |
4367 | ||
9908b566 | 4368 | static int |
2a9a2795 | 4369 | linux_nat_supports_non_stop (struct target_ops *self) |
9908b566 VP |
4370 | { |
4371 | return 1; | |
4372 | } | |
4373 | ||
fbea99ea PA |
4374 | /* to_always_non_stop_p implementation. */ |
4375 | ||
4376 | static int | |
4377 | linux_nat_always_non_stop_p (struct target_ops *self) | |
4378 | { | |
f12899e9 | 4379 | return 1; |
fbea99ea PA |
4380 | } |
4381 | ||
d90e17a7 PA |
4382 | /* True if we want to support multi-process. To be removed when GDB |
4383 | supports multi-exec. */ | |
4384 | ||
2277426b | 4385 | int linux_multi_process = 1; |
d90e17a7 PA |
4386 | |
4387 | static int | |
86ce2668 | 4388 | linux_nat_supports_multi_process (struct target_ops *self) |
d90e17a7 PA |
4389 | { |
4390 | return linux_multi_process; | |
4391 | } | |
4392 | ||
03583c20 | 4393 | static int |
2bfc0540 | 4394 | linux_nat_supports_disable_randomization (struct target_ops *self) |
03583c20 UW |
4395 | { |
4396 | #ifdef HAVE_PERSONALITY | |
4397 | return 1; | |
4398 | #else | |
4399 | return 0; | |
4400 | #endif | |
4401 | } | |
4402 | ||
b84876c2 PA |
4403 | static int async_terminal_is_ours = 1; |
4404 | ||
4d4ca2a1 DE |
4405 | /* target_terminal_inferior implementation. |
4406 | ||
4407 | This is a wrapper around child_terminal_inferior to add async support. */ | |
b84876c2 PA |
4408 | |
4409 | static void | |
d2f640d4 | 4410 | linux_nat_terminal_inferior (struct target_ops *self) |
b84876c2 | 4411 | { |
d6b64346 | 4412 | child_terminal_inferior (self); |
b84876c2 | 4413 | |
d9d2d8b6 | 4414 | /* Calls to target_terminal_*() are meant to be idempotent. */ |
b84876c2 PA |
4415 | if (!async_terminal_is_ours) |
4416 | return; | |
4417 | ||
b84876c2 PA |
4418 | async_terminal_is_ours = 0; |
4419 | set_sigint_trap (); | |
4420 | } | |
4421 | ||
4d4ca2a1 DE |
4422 | /* target_terminal_ours implementation. |
4423 | ||
4424 | This is a wrapper around child_terminal_ours to add async support (and | |
4425 | implement the target_terminal_ours vs target_terminal_ours_for_output | |
4426 | distinction). child_terminal_ours is currently no different than | |
4427 | child_terminal_ours_for_output. | |
4428 | We leave target_terminal_ours_for_output alone, leaving it to | |
4429 | child_terminal_ours_for_output. */ | |
b84876c2 | 4430 | |
2c0b251b | 4431 | static void |
e3594fd1 | 4432 | linux_nat_terminal_ours (struct target_ops *self) |
b84876c2 | 4433 | { |
b84876c2 PA |
4434 | /* GDB should never give the terminal to the inferior if the |
4435 | inferior is running in the background (run&, continue&, etc.), | |
4436 | but claiming it sure should. */ | |
d6b64346 | 4437 | child_terminal_ours (self); |
b84876c2 | 4438 | |
b84876c2 PA |
4439 | if (async_terminal_is_ours) |
4440 | return; | |
4441 | ||
4442 | clear_sigint_trap (); | |
b84876c2 PA |
4443 | async_terminal_is_ours = 1; |
4444 | } | |
4445 | ||
7feb7d06 PA |
4446 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4447 | so we notice when any child changes state, and notify the | |
4448 | event-loop; it allows us to use sigsuspend in linux_nat_wait_1 | |
4449 | above to wait for the arrival of a SIGCHLD. */ | |
4450 | ||
b84876c2 | 4451 | static void |
7feb7d06 | 4452 | sigchld_handler (int signo) |
b84876c2 | 4453 | { |
7feb7d06 PA |
4454 | int old_errno = errno; |
4455 | ||
01124a23 DE |
4456 | if (debug_linux_nat) |
4457 | ui_file_write_async_safe (gdb_stdlog, | |
4458 | "sigchld\n", sizeof ("sigchld\n") - 1); | |
7feb7d06 PA |
4459 | |
4460 | if (signo == SIGCHLD | |
4461 | && linux_nat_event_pipe[0] != -1) | |
4462 | async_file_mark (); /* Let the event loop know that there are | |
4463 | events to handle. */ | |
4464 | ||
4465 | errno = old_errno; | |
4466 | } | |
4467 | ||
4468 | /* Callback registered with the target events file descriptor. */ | |
4469 | ||
4470 | static void | |
4471 | handle_target_event (int error, gdb_client_data client_data) | |
4472 | { | |
6a3753b3 | 4473 | inferior_event_handler (INF_REG_EVENT, NULL); |
7feb7d06 PA |
4474 | } |
4475 | ||
4476 | /* Create/destroy the target events pipe. Returns previous state. */ | |
4477 | ||
4478 | static int | |
4479 | linux_async_pipe (int enable) | |
4480 | { | |
198297aa | 4481 | int previous = linux_is_async_p (); |
7feb7d06 PA |
4482 | |
4483 | if (previous != enable) | |
4484 | { | |
4485 | sigset_t prev_mask; | |
4486 | ||
12696c10 PA |
4487 | /* Block child signals while we create/destroy the pipe, as |
4488 | their handler writes to it. */ | |
7feb7d06 PA |
4489 | block_child_signals (&prev_mask); |
4490 | ||
4491 | if (enable) | |
4492 | { | |
614c279d | 4493 | if (gdb_pipe_cloexec (linux_nat_event_pipe) == -1) |
7feb7d06 PA |
4494 | internal_error (__FILE__, __LINE__, |
4495 | "creating event pipe failed."); | |
4496 | ||
4497 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4498 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4499 | } | |
4500 | else | |
4501 | { | |
4502 | close (linux_nat_event_pipe[0]); | |
4503 | close (linux_nat_event_pipe[1]); | |
4504 | linux_nat_event_pipe[0] = -1; | |
4505 | linux_nat_event_pipe[1] = -1; | |
4506 | } | |
4507 | ||
4508 | restore_child_signals_mask (&prev_mask); | |
4509 | } | |
4510 | ||
4511 | return previous; | |
b84876c2 PA |
4512 | } |
4513 | ||
4514 | /* target_async implementation. */ | |
4515 | ||
4516 | static void | |
6a3753b3 | 4517 | linux_nat_async (struct target_ops *ops, int enable) |
b84876c2 | 4518 | { |
6a3753b3 | 4519 | if (enable) |
b84876c2 | 4520 | { |
7feb7d06 PA |
4521 | if (!linux_async_pipe (1)) |
4522 | { | |
4523 | add_file_handler (linux_nat_event_pipe[0], | |
4524 | handle_target_event, NULL); | |
4525 | /* There may be pending events to handle. Tell the event loop | |
4526 | to poll them. */ | |
4527 | async_file_mark (); | |
4528 | } | |
b84876c2 PA |
4529 | } |
4530 | else | |
4531 | { | |
b84876c2 | 4532 | delete_file_handler (linux_nat_event_pipe[0]); |
7feb7d06 | 4533 | linux_async_pipe (0); |
b84876c2 PA |
4534 | } |
4535 | return; | |
4536 | } | |
4537 | ||
a493e3e2 | 4538 | /* Stop an LWP, and push a GDB_SIGNAL_0 stop status if no other |
252fbfc8 PA |
4539 | event came out. */ |
4540 | ||
4c28f408 | 4541 | static int |
252fbfc8 | 4542 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 4543 | { |
d90e17a7 | 4544 | if (!lwp->stopped) |
252fbfc8 | 4545 | { |
d90e17a7 PA |
4546 | if (debug_linux_nat) |
4547 | fprintf_unfiltered (gdb_stdlog, | |
4548 | "LNSL: running -> suspending %s\n", | |
4549 | target_pid_to_str (lwp->ptid)); | |
252fbfc8 | 4550 | |
252fbfc8 | 4551 | |
25289eb2 PA |
4552 | if (lwp->last_resume_kind == resume_stop) |
4553 | { | |
4554 | if (debug_linux_nat) | |
4555 | fprintf_unfiltered (gdb_stdlog, | |
4556 | "linux-nat: already stopping LWP %ld at " | |
4557 | "GDB's request\n", | |
4558 | ptid_get_lwp (lwp->ptid)); | |
4559 | return 0; | |
4560 | } | |
252fbfc8 | 4561 | |
25289eb2 PA |
4562 | stop_callback (lwp, NULL); |
4563 | lwp->last_resume_kind = resume_stop; | |
d90e17a7 PA |
4564 | } |
4565 | else | |
4566 | { | |
4567 | /* Already known to be stopped; do nothing. */ | |
252fbfc8 | 4568 | |
d90e17a7 PA |
4569 | if (debug_linux_nat) |
4570 | { | |
e09875d4 | 4571 | if (find_thread_ptid (lwp->ptid)->stop_requested) |
3e43a32a MS |
4572 | fprintf_unfiltered (gdb_stdlog, |
4573 | "LNSL: already stopped/stop_requested %s\n", | |
d90e17a7 PA |
4574 | target_pid_to_str (lwp->ptid)); |
4575 | else | |
3e43a32a MS |
4576 | fprintf_unfiltered (gdb_stdlog, |
4577 | "LNSL: already stopped/no " | |
4578 | "stop_requested yet %s\n", | |
d90e17a7 | 4579 | target_pid_to_str (lwp->ptid)); |
252fbfc8 PA |
4580 | } |
4581 | } | |
4c28f408 PA |
4582 | return 0; |
4583 | } | |
4584 | ||
4585 | static void | |
1eab8a48 | 4586 | linux_nat_stop (struct target_ops *self, ptid_t ptid) |
4c28f408 | 4587 | { |
bfedc46a PA |
4588 | iterate_over_lwps (ptid, linux_nat_stop_lwp, NULL); |
4589 | } | |
4590 | ||
d90e17a7 | 4591 | static void |
de90e03d | 4592 | linux_nat_close (struct target_ops *self) |
d90e17a7 PA |
4593 | { |
4594 | /* Unregister from the event loop. */ | |
9debeba0 | 4595 | if (linux_nat_is_async_p (self)) |
6a3753b3 | 4596 | linux_nat_async (self, 0); |
d90e17a7 | 4597 | |
d90e17a7 | 4598 | if (linux_ops->to_close) |
de90e03d | 4599 | linux_ops->to_close (linux_ops); |
6a3cb8e8 PA |
4600 | |
4601 | super_close (self); | |
d90e17a7 PA |
4602 | } |
4603 | ||
c0694254 PA |
4604 | /* When requests are passed down from the linux-nat layer to the |
4605 | single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are | |
4606 | used. The address space pointer is stored in the inferior object, | |
4607 | but the common code that is passed such ptid can't tell whether | |
4608 | lwpid is a "main" process id or not (it assumes so). We reverse | |
4609 | look up the "main" process id from the lwp here. */ | |
4610 | ||
70221824 | 4611 | static struct address_space * |
c0694254 PA |
4612 | linux_nat_thread_address_space (struct target_ops *t, ptid_t ptid) |
4613 | { | |
4614 | struct lwp_info *lwp; | |
4615 | struct inferior *inf; | |
4616 | int pid; | |
4617 | ||
dfd4cc63 | 4618 | if (ptid_get_lwp (ptid) == 0) |
c0694254 PA |
4619 | { |
4620 | /* An (lwpid,0,0) ptid. Look up the lwp object to get at the | |
4621 | tgid. */ | |
4622 | lwp = find_lwp_pid (ptid); | |
dfd4cc63 | 4623 | pid = ptid_get_pid (lwp->ptid); |
c0694254 PA |
4624 | } |
4625 | else | |
4626 | { | |
4627 | /* A (pid,lwpid,0) ptid. */ | |
dfd4cc63 | 4628 | pid = ptid_get_pid (ptid); |
c0694254 PA |
4629 | } |
4630 | ||
4631 | inf = find_inferior_pid (pid); | |
4632 | gdb_assert (inf != NULL); | |
4633 | return inf->aspace; | |
4634 | } | |
4635 | ||
dc146f7c VP |
4636 | /* Return the cached value of the processor core for thread PTID. */ |
4637 | ||
70221824 | 4638 | static int |
dc146f7c VP |
4639 | linux_nat_core_of_thread (struct target_ops *ops, ptid_t ptid) |
4640 | { | |
4641 | struct lwp_info *info = find_lwp_pid (ptid); | |
e0881a8e | 4642 | |
dc146f7c VP |
4643 | if (info) |
4644 | return info->core; | |
4645 | return -1; | |
4646 | } | |
4647 | ||
7a6a1731 GB |
4648 | /* Implementation of to_filesystem_is_local. */ |
4649 | ||
4650 | static int | |
4651 | linux_nat_filesystem_is_local (struct target_ops *ops) | |
4652 | { | |
4653 | struct inferior *inf = current_inferior (); | |
4654 | ||
4655 | if (inf->fake_pid_p || inf->pid == 0) | |
4656 | return 1; | |
4657 | ||
4658 | return linux_ns_same (inf->pid, LINUX_NS_MNT); | |
4659 | } | |
4660 | ||
4661 | /* Convert the INF argument passed to a to_fileio_* method | |
4662 | to a process ID suitable for passing to its corresponding | |
4663 | linux_mntns_* function. If INF is non-NULL then the | |
4664 | caller is requesting the filesystem seen by INF. If INF | |
4665 | is NULL then the caller is requesting the filesystem seen | |
4666 | by the GDB. We fall back to GDB's filesystem in the case | |
4667 | that INF is non-NULL but its PID is unknown. */ | |
4668 | ||
4669 | static pid_t | |
4670 | linux_nat_fileio_pid_of (struct inferior *inf) | |
4671 | { | |
4672 | if (inf == NULL || inf->fake_pid_p || inf->pid == 0) | |
4673 | return getpid (); | |
4674 | else | |
4675 | return inf->pid; | |
4676 | } | |
4677 | ||
4678 | /* Implementation of to_fileio_open. */ | |
4679 | ||
4680 | static int | |
4681 | linux_nat_fileio_open (struct target_ops *self, | |
4682 | struct inferior *inf, const char *filename, | |
4313b8c0 GB |
4683 | int flags, int mode, int warn_if_slow, |
4684 | int *target_errno) | |
7a6a1731 GB |
4685 | { |
4686 | int nat_flags; | |
4687 | mode_t nat_mode; | |
4688 | int fd; | |
4689 | ||
4690 | if (fileio_to_host_openflags (flags, &nat_flags) == -1 | |
4691 | || fileio_to_host_mode (mode, &nat_mode) == -1) | |
4692 | { | |
4693 | *target_errno = FILEIO_EINVAL; | |
4694 | return -1; | |
4695 | } | |
4696 | ||
4697 | fd = linux_mntns_open_cloexec (linux_nat_fileio_pid_of (inf), | |
4698 | filename, nat_flags, nat_mode); | |
4699 | if (fd == -1) | |
4700 | *target_errno = host_to_fileio_error (errno); | |
4701 | ||
4702 | return fd; | |
4703 | } | |
4704 | ||
4705 | /* Implementation of to_fileio_readlink. */ | |
4706 | ||
4707 | static char * | |
4708 | linux_nat_fileio_readlink (struct target_ops *self, | |
4709 | struct inferior *inf, const char *filename, | |
4710 | int *target_errno) | |
4711 | { | |
4712 | char buf[PATH_MAX]; | |
4713 | int len; | |
4714 | char *ret; | |
4715 | ||
4716 | len = linux_mntns_readlink (linux_nat_fileio_pid_of (inf), | |
4717 | filename, buf, sizeof (buf)); | |
4718 | if (len < 0) | |
4719 | { | |
4720 | *target_errno = host_to_fileio_error (errno); | |
4721 | return NULL; | |
4722 | } | |
4723 | ||
224c3ddb | 4724 | ret = (char *) xmalloc (len + 1); |
7a6a1731 GB |
4725 | memcpy (ret, buf, len); |
4726 | ret[len] = '\0'; | |
4727 | return ret; | |
4728 | } | |
4729 | ||
4730 | /* Implementation of to_fileio_unlink. */ | |
4731 | ||
4732 | static int | |
4733 | linux_nat_fileio_unlink (struct target_ops *self, | |
4734 | struct inferior *inf, const char *filename, | |
4735 | int *target_errno) | |
4736 | { | |
4737 | int ret; | |
4738 | ||
4739 | ret = linux_mntns_unlink (linux_nat_fileio_pid_of (inf), | |
4740 | filename); | |
4741 | if (ret == -1) | |
4742 | *target_errno = host_to_fileio_error (errno); | |
4743 | ||
4744 | return ret; | |
4745 | } | |
4746 | ||
aa01bd36 PA |
4747 | /* Implementation of the to_thread_events method. */ |
4748 | ||
4749 | static void | |
4750 | linux_nat_thread_events (struct target_ops *ops, int enable) | |
4751 | { | |
4752 | report_thread_events = enable; | |
4753 | } | |
4754 | ||
f973ed9c DJ |
4755 | void |
4756 | linux_nat_add_target (struct target_ops *t) | |
4757 | { | |
f973ed9c DJ |
4758 | /* Save the provided single-threaded target. We save this in a separate |
4759 | variable because another target we've inherited from (e.g. inf-ptrace) | |
4760 | may have saved a pointer to T; we want to use it for the final | |
4761 | process stratum target. */ | |
4762 | linux_ops_saved = *t; | |
4763 | linux_ops = &linux_ops_saved; | |
4764 | ||
4765 | /* Override some methods for multithreading. */ | |
b84876c2 | 4766 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
4767 | t->to_attach = linux_nat_attach; |
4768 | t->to_detach = linux_nat_detach; | |
4769 | t->to_resume = linux_nat_resume; | |
4770 | t->to_wait = linux_nat_wait; | |
2455069d | 4771 | t->to_pass_signals = linux_nat_pass_signals; |
f973ed9c DJ |
4772 | t->to_xfer_partial = linux_nat_xfer_partial; |
4773 | t->to_kill = linux_nat_kill; | |
4774 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
4775 | t->to_thread_alive = linux_nat_thread_alive; | |
8a06aea7 | 4776 | t->to_update_thread_list = linux_nat_update_thread_list; |
f973ed9c | 4777 | t->to_pid_to_str = linux_nat_pid_to_str; |
4694da01 | 4778 | t->to_thread_name = linux_nat_thread_name; |
f973ed9c | 4779 | t->to_has_thread_control = tc_schedlock; |
c0694254 | 4780 | t->to_thread_address_space = linux_nat_thread_address_space; |
ebec9a0f PA |
4781 | t->to_stopped_by_watchpoint = linux_nat_stopped_by_watchpoint; |
4782 | t->to_stopped_data_address = linux_nat_stopped_data_address; | |
faf09f01 PA |
4783 | t->to_stopped_by_sw_breakpoint = linux_nat_stopped_by_sw_breakpoint; |
4784 | t->to_supports_stopped_by_sw_breakpoint = linux_nat_supports_stopped_by_sw_breakpoint; | |
4785 | t->to_stopped_by_hw_breakpoint = linux_nat_stopped_by_hw_breakpoint; | |
4786 | t->to_supports_stopped_by_hw_breakpoint = linux_nat_supports_stopped_by_hw_breakpoint; | |
aa01bd36 | 4787 | t->to_thread_events = linux_nat_thread_events; |
f973ed9c | 4788 | |
b84876c2 PA |
4789 | t->to_can_async_p = linux_nat_can_async_p; |
4790 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 4791 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
fbea99ea | 4792 | t->to_always_non_stop_p = linux_nat_always_non_stop_p; |
b84876c2 | 4793 | t->to_async = linux_nat_async; |
b84876c2 PA |
4794 | t->to_terminal_inferior = linux_nat_terminal_inferior; |
4795 | t->to_terminal_ours = linux_nat_terminal_ours; | |
6a3cb8e8 PA |
4796 | |
4797 | super_close = t->to_close; | |
d90e17a7 | 4798 | t->to_close = linux_nat_close; |
b84876c2 | 4799 | |
4c28f408 PA |
4800 | t->to_stop = linux_nat_stop; |
4801 | ||
d90e17a7 PA |
4802 | t->to_supports_multi_process = linux_nat_supports_multi_process; |
4803 | ||
03583c20 UW |
4804 | t->to_supports_disable_randomization |
4805 | = linux_nat_supports_disable_randomization; | |
4806 | ||
dc146f7c VP |
4807 | t->to_core_of_thread = linux_nat_core_of_thread; |
4808 | ||
7a6a1731 GB |
4809 | t->to_filesystem_is_local = linux_nat_filesystem_is_local; |
4810 | t->to_fileio_open = linux_nat_fileio_open; | |
4811 | t->to_fileio_readlink = linux_nat_fileio_readlink; | |
4812 | t->to_fileio_unlink = linux_nat_fileio_unlink; | |
4813 | ||
f973ed9c DJ |
4814 | /* We don't change the stratum; this target will sit at |
4815 | process_stratum and thread_db will set at thread_stratum. This | |
4816 | is a little strange, since this is a multi-threaded-capable | |
4817 | target, but we want to be on the stack below thread_db, and we | |
4818 | also want to be used for single-threaded processes. */ | |
4819 | ||
4820 | add_target (t); | |
f973ed9c DJ |
4821 | } |
4822 | ||
9f0bdab8 DJ |
4823 | /* Register a method to call whenever a new thread is attached. */ |
4824 | void | |
7b50312a PA |
4825 | linux_nat_set_new_thread (struct target_ops *t, |
4826 | void (*new_thread) (struct lwp_info *)) | |
9f0bdab8 DJ |
4827 | { |
4828 | /* Save the pointer. We only support a single registered instance | |
4829 | of the GNU/Linux native target, so we do not need to map this to | |
4830 | T. */ | |
4831 | linux_nat_new_thread = new_thread; | |
4832 | } | |
4833 | ||
26cb8b7c PA |
4834 | /* See declaration in linux-nat.h. */ |
4835 | ||
4836 | void | |
4837 | linux_nat_set_new_fork (struct target_ops *t, | |
4838 | linux_nat_new_fork_ftype *new_fork) | |
4839 | { | |
4840 | /* Save the pointer. */ | |
4841 | linux_nat_new_fork = new_fork; | |
4842 | } | |
4843 | ||
4844 | /* See declaration in linux-nat.h. */ | |
4845 | ||
4846 | void | |
4847 | linux_nat_set_forget_process (struct target_ops *t, | |
4848 | linux_nat_forget_process_ftype *fn) | |
4849 | { | |
4850 | /* Save the pointer. */ | |
4851 | linux_nat_forget_process_hook = fn; | |
4852 | } | |
4853 | ||
4854 | /* See declaration in linux-nat.h. */ | |
4855 | ||
4856 | void | |
4857 | linux_nat_forget_process (pid_t pid) | |
4858 | { | |
4859 | if (linux_nat_forget_process_hook != NULL) | |
4860 | linux_nat_forget_process_hook (pid); | |
4861 | } | |
4862 | ||
5b009018 PA |
4863 | /* Register a method that converts a siginfo object between the layout |
4864 | that ptrace returns, and the layout in the architecture of the | |
4865 | inferior. */ | |
4866 | void | |
4867 | linux_nat_set_siginfo_fixup (struct target_ops *t, | |
a5362b9a | 4868 | int (*siginfo_fixup) (siginfo_t *, |
5b009018 PA |
4869 | gdb_byte *, |
4870 | int)) | |
4871 | { | |
4872 | /* Save the pointer. */ | |
4873 | linux_nat_siginfo_fixup = siginfo_fixup; | |
4874 | } | |
4875 | ||
7b50312a PA |
4876 | /* Register a method to call prior to resuming a thread. */ |
4877 | ||
4878 | void | |
4879 | linux_nat_set_prepare_to_resume (struct target_ops *t, | |
4880 | void (*prepare_to_resume) (struct lwp_info *)) | |
4881 | { | |
4882 | /* Save the pointer. */ | |
4883 | linux_nat_prepare_to_resume = prepare_to_resume; | |
4884 | } | |
4885 | ||
f865ee35 JK |
4886 | /* See linux-nat.h. */ |
4887 | ||
4888 | int | |
4889 | linux_nat_get_siginfo (ptid_t ptid, siginfo_t *siginfo) | |
9f0bdab8 | 4890 | { |
da559b09 | 4891 | int pid; |
9f0bdab8 | 4892 | |
dfd4cc63 | 4893 | pid = ptid_get_lwp (ptid); |
da559b09 | 4894 | if (pid == 0) |
dfd4cc63 | 4895 | pid = ptid_get_pid (ptid); |
f865ee35 | 4896 | |
da559b09 JK |
4897 | errno = 0; |
4898 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, siginfo); | |
4899 | if (errno != 0) | |
4900 | { | |
4901 | memset (siginfo, 0, sizeof (*siginfo)); | |
4902 | return 0; | |
4903 | } | |
f865ee35 | 4904 | return 1; |
9f0bdab8 DJ |
4905 | } |
4906 | ||
7b669087 GB |
4907 | /* See nat/linux-nat.h. */ |
4908 | ||
4909 | ptid_t | |
4910 | current_lwp_ptid (void) | |
4911 | { | |
4912 | gdb_assert (ptid_lwp_p (inferior_ptid)); | |
4913 | return inferior_ptid; | |
4914 | } | |
4915 | ||
2c0b251b PA |
4916 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
4917 | extern initialize_file_ftype _initialize_linux_nat; | |
4918 | ||
d6b0e80f AC |
4919 | void |
4920 | _initialize_linux_nat (void) | |
4921 | { | |
ccce17b0 YQ |
4922 | add_setshow_zuinteger_cmd ("lin-lwp", class_maintenance, |
4923 | &debug_linux_nat, _("\ | |
b84876c2 PA |
4924 | Set debugging of GNU/Linux lwp module."), _("\ |
4925 | Show debugging of GNU/Linux lwp module."), _("\ | |
4926 | Enables printf debugging output."), | |
ccce17b0 YQ |
4927 | NULL, |
4928 | show_debug_linux_nat, | |
4929 | &setdebuglist, &showdebuglist); | |
b84876c2 | 4930 | |
7a6a1731 GB |
4931 | add_setshow_boolean_cmd ("linux-namespaces", class_maintenance, |
4932 | &debug_linux_namespaces, _("\ | |
4933 | Set debugging of GNU/Linux namespaces module."), _("\ | |
4934 | Show debugging of GNU/Linux namespaces module."), _("\ | |
4935 | Enables printf debugging output."), | |
4936 | NULL, | |
4937 | NULL, | |
4938 | &setdebuglist, &showdebuglist); | |
4939 | ||
b84876c2 | 4940 | /* Save this mask as the default. */ |
d6b0e80f AC |
4941 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
4942 | ||
7feb7d06 PA |
4943 | /* Install a SIGCHLD handler. */ |
4944 | sigchld_action.sa_handler = sigchld_handler; | |
4945 | sigemptyset (&sigchld_action.sa_mask); | |
4946 | sigchld_action.sa_flags = SA_RESTART; | |
b84876c2 PA |
4947 | |
4948 | /* Make it the default. */ | |
7feb7d06 | 4949 | sigaction (SIGCHLD, &sigchld_action, NULL); |
d6b0e80f AC |
4950 | |
4951 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
4952 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
4953 | sigdelset (&suspend_mask, SIGCHLD); | |
4954 | ||
7feb7d06 | 4955 | sigemptyset (&blocked_mask); |
774113b0 PA |
4956 | |
4957 | lwp_lwpid_htab_create (); | |
d6b0e80f AC |
4958 | } |
4959 | \f | |
4960 | ||
4961 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
4962 | the GNU/Linux Threads library and therefore doesn't really belong | |
4963 | here. */ | |
4964 | ||
d6b0e80f AC |
4965 | /* Return the set of signals used by the threads library in *SET. */ |
4966 | ||
4967 | void | |
4968 | lin_thread_get_thread_signals (sigset_t *set) | |
4969 | { | |
d6b0e80f AC |
4970 | sigemptyset (set); |
4971 | ||
4a6ed09b PA |
4972 | /* NPTL reserves the first two RT signals, but does not provide any |
4973 | way for the debugger to query the signal numbers - fortunately | |
4974 | they don't change. */ | |
4975 | sigaddset (set, __SIGRTMIN); | |
4976 | sigaddset (set, __SIGRTMIN + 1); | |
d6b0e80f | 4977 | } |