Commit | Line | Data |
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3993f6b1 | 1 | /* GNU/Linux native-dependent code common to multiple platforms. |
dba24537 | 2 | |
e2882c85 | 3 | Copyright (C) 2001-2018 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 | ||
466eecee SM |
200 | /* The method to call, if any, when a thread is destroyed. */ |
201 | static void (*linux_nat_delete_thread) (struct arch_lwp_info *); | |
202 | ||
26cb8b7c PA |
203 | /* The method to call, if any, when a new fork is attached. */ |
204 | static linux_nat_new_fork_ftype *linux_nat_new_fork; | |
205 | ||
206 | /* The method to call, if any, when a process is no longer | |
207 | attached. */ | |
208 | static linux_nat_forget_process_ftype *linux_nat_forget_process_hook; | |
209 | ||
7b50312a PA |
210 | /* Hook to call prior to resuming a thread. */ |
211 | static void (*linux_nat_prepare_to_resume) (struct lwp_info *); | |
9f0bdab8 | 212 | |
5b009018 PA |
213 | /* The method to call, if any, when the siginfo object needs to be |
214 | converted between the layout returned by ptrace, and the layout in | |
215 | the architecture of the inferior. */ | |
a5362b9a | 216 | static int (*linux_nat_siginfo_fixup) (siginfo_t *, |
5b009018 PA |
217 | gdb_byte *, |
218 | int); | |
219 | ||
ac264b3b MS |
220 | /* The saved to_xfer_partial method, inherited from inf-ptrace.c. |
221 | Called by our to_xfer_partial. */ | |
4ac248ca | 222 | static target_xfer_partial_ftype *super_xfer_partial; |
10d6c8cd | 223 | |
6a3cb8e8 PA |
224 | /* The saved to_close method, inherited from inf-ptrace.c. |
225 | Called by our to_close. */ | |
226 | static void (*super_close) (struct target_ops *); | |
227 | ||
ccce17b0 | 228 | static unsigned int debug_linux_nat; |
920d2a44 AC |
229 | static void |
230 | show_debug_linux_nat (struct ui_file *file, int from_tty, | |
231 | struct cmd_list_element *c, const char *value) | |
232 | { | |
233 | fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"), | |
234 | value); | |
235 | } | |
d6b0e80f | 236 | |
ae087d01 DJ |
237 | struct simple_pid_list |
238 | { | |
239 | int pid; | |
3d799a95 | 240 | int status; |
ae087d01 DJ |
241 | struct simple_pid_list *next; |
242 | }; | |
243 | struct simple_pid_list *stopped_pids; | |
244 | ||
aa01bd36 PA |
245 | /* Whether target_thread_events is in effect. */ |
246 | static int report_thread_events; | |
247 | ||
3dd5b83d PA |
248 | /* Async mode support. */ |
249 | ||
b84876c2 PA |
250 | /* The read/write ends of the pipe registered as waitable file in the |
251 | event loop. */ | |
252 | static int linux_nat_event_pipe[2] = { -1, -1 }; | |
253 | ||
198297aa PA |
254 | /* True if we're currently in async mode. */ |
255 | #define linux_is_async_p() (linux_nat_event_pipe[0] != -1) | |
256 | ||
7feb7d06 | 257 | /* Flush the event pipe. */ |
b84876c2 | 258 | |
7feb7d06 PA |
259 | static void |
260 | async_file_flush (void) | |
b84876c2 | 261 | { |
7feb7d06 PA |
262 | int ret; |
263 | char buf; | |
b84876c2 | 264 | |
7feb7d06 | 265 | do |
b84876c2 | 266 | { |
7feb7d06 | 267 | ret = read (linux_nat_event_pipe[0], &buf, 1); |
b84876c2 | 268 | } |
7feb7d06 | 269 | while (ret >= 0 || (ret == -1 && errno == EINTR)); |
b84876c2 PA |
270 | } |
271 | ||
7feb7d06 PA |
272 | /* Put something (anything, doesn't matter what, or how much) in event |
273 | pipe, so that the select/poll in the event-loop realizes we have | |
274 | something to process. */ | |
252fbfc8 | 275 | |
b84876c2 | 276 | static void |
7feb7d06 | 277 | async_file_mark (void) |
b84876c2 | 278 | { |
7feb7d06 | 279 | int ret; |
b84876c2 | 280 | |
7feb7d06 PA |
281 | /* It doesn't really matter what the pipe contains, as long we end |
282 | up with something in it. Might as well flush the previous | |
283 | left-overs. */ | |
284 | async_file_flush (); | |
b84876c2 | 285 | |
7feb7d06 | 286 | do |
b84876c2 | 287 | { |
7feb7d06 | 288 | ret = write (linux_nat_event_pipe[1], "+", 1); |
b84876c2 | 289 | } |
7feb7d06 | 290 | while (ret == -1 && errno == EINTR); |
b84876c2 | 291 | |
7feb7d06 PA |
292 | /* Ignore EAGAIN. If the pipe is full, the event loop will already |
293 | be awakened anyway. */ | |
b84876c2 PA |
294 | } |
295 | ||
7feb7d06 PA |
296 | static int kill_lwp (int lwpid, int signo); |
297 | ||
298 | static int stop_callback (struct lwp_info *lp, void *data); | |
2db9a427 | 299 | static int resume_stopped_resumed_lwps (struct lwp_info *lp, void *data); |
7feb7d06 PA |
300 | |
301 | static void block_child_signals (sigset_t *prev_mask); | |
302 | static void restore_child_signals_mask (sigset_t *prev_mask); | |
2277426b PA |
303 | |
304 | struct lwp_info; | |
305 | static struct lwp_info *add_lwp (ptid_t ptid); | |
306 | static void purge_lwp_list (int pid); | |
4403d8e9 | 307 | static void delete_lwp (ptid_t ptid); |
2277426b PA |
308 | static struct lwp_info *find_lwp_pid (ptid_t ptid); |
309 | ||
8a99810d PA |
310 | static int lwp_status_pending_p (struct lwp_info *lp); |
311 | ||
9c02b525 PA |
312 | static int sigtrap_is_event (int status); |
313 | static int (*linux_nat_status_is_event) (int status) = sigtrap_is_event; | |
314 | ||
e7ad2f14 PA |
315 | static void save_stop_reason (struct lwp_info *lp); |
316 | ||
cff068da GB |
317 | \f |
318 | /* LWP accessors. */ | |
319 | ||
320 | /* See nat/linux-nat.h. */ | |
321 | ||
322 | ptid_t | |
323 | ptid_of_lwp (struct lwp_info *lwp) | |
324 | { | |
325 | return lwp->ptid; | |
326 | } | |
327 | ||
328 | /* See nat/linux-nat.h. */ | |
329 | ||
4b134ca1 GB |
330 | void |
331 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
332 | struct arch_lwp_info *info) | |
333 | { | |
334 | lwp->arch_private = info; | |
335 | } | |
336 | ||
337 | /* See nat/linux-nat.h. */ | |
338 | ||
339 | struct arch_lwp_info * | |
340 | lwp_arch_private_info (struct lwp_info *lwp) | |
341 | { | |
342 | return lwp->arch_private; | |
343 | } | |
344 | ||
345 | /* See nat/linux-nat.h. */ | |
346 | ||
cff068da GB |
347 | int |
348 | lwp_is_stopped (struct lwp_info *lwp) | |
349 | { | |
350 | return lwp->stopped; | |
351 | } | |
352 | ||
353 | /* See nat/linux-nat.h. */ | |
354 | ||
355 | enum target_stop_reason | |
356 | lwp_stop_reason (struct lwp_info *lwp) | |
357 | { | |
358 | return lwp->stop_reason; | |
359 | } | |
360 | ||
0e00e962 AA |
361 | /* See nat/linux-nat.h. */ |
362 | ||
363 | int | |
364 | lwp_is_stepping (struct lwp_info *lwp) | |
365 | { | |
366 | return lwp->step; | |
367 | } | |
368 | ||
ae087d01 DJ |
369 | \f |
370 | /* Trivial list manipulation functions to keep track of a list of | |
371 | new stopped processes. */ | |
372 | static void | |
3d799a95 | 373 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) |
ae087d01 | 374 | { |
8d749320 | 375 | struct simple_pid_list *new_pid = XNEW (struct simple_pid_list); |
e0881a8e | 376 | |
ae087d01 | 377 | new_pid->pid = pid; |
3d799a95 | 378 | new_pid->status = status; |
ae087d01 DJ |
379 | new_pid->next = *listp; |
380 | *listp = new_pid; | |
381 | } | |
382 | ||
383 | static int | |
46a96992 | 384 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) |
ae087d01 DJ |
385 | { |
386 | struct simple_pid_list **p; | |
387 | ||
388 | for (p = listp; *p != NULL; p = &(*p)->next) | |
389 | if ((*p)->pid == pid) | |
390 | { | |
391 | struct simple_pid_list *next = (*p)->next; | |
e0881a8e | 392 | |
46a96992 | 393 | *statusp = (*p)->status; |
ae087d01 DJ |
394 | xfree (*p); |
395 | *p = next; | |
396 | return 1; | |
397 | } | |
398 | return 0; | |
399 | } | |
400 | ||
de0d863e DB |
401 | /* Return the ptrace options that we want to try to enable. */ |
402 | ||
403 | static int | |
404 | linux_nat_ptrace_options (int attached) | |
405 | { | |
406 | int options = 0; | |
407 | ||
408 | if (!attached) | |
409 | options |= PTRACE_O_EXITKILL; | |
410 | ||
411 | options |= (PTRACE_O_TRACESYSGOOD | |
412 | | PTRACE_O_TRACEVFORKDONE | |
413 | | PTRACE_O_TRACEVFORK | |
414 | | PTRACE_O_TRACEFORK | |
415 | | PTRACE_O_TRACEEXEC); | |
416 | ||
417 | return options; | |
418 | } | |
419 | ||
96d7229d | 420 | /* Initialize ptrace warnings and check for supported ptrace |
beed38b8 JB |
421 | features given PID. |
422 | ||
423 | ATTACHED should be nonzero iff we attached to the inferior. */ | |
3993f6b1 DJ |
424 | |
425 | static void | |
beed38b8 | 426 | linux_init_ptrace (pid_t pid, int attached) |
3993f6b1 | 427 | { |
de0d863e DB |
428 | int options = linux_nat_ptrace_options (attached); |
429 | ||
430 | linux_enable_event_reporting (pid, options); | |
96d7229d | 431 | linux_ptrace_init_warnings (); |
4de4c07c DJ |
432 | } |
433 | ||
6d8fd2b7 | 434 | static void |
f045800c | 435 | linux_child_post_attach (struct target_ops *self, int pid) |
4de4c07c | 436 | { |
beed38b8 | 437 | linux_init_ptrace (pid, 1); |
4de4c07c DJ |
438 | } |
439 | ||
10d6c8cd | 440 | static void |
2e97a79e | 441 | linux_child_post_startup_inferior (struct target_ops *self, ptid_t ptid) |
4de4c07c | 442 | { |
beed38b8 | 443 | linux_init_ptrace (ptid_get_pid (ptid), 0); |
4de4c07c DJ |
444 | } |
445 | ||
4403d8e9 JK |
446 | /* Return the number of known LWPs in the tgid given by PID. */ |
447 | ||
448 | static int | |
449 | num_lwps (int pid) | |
450 | { | |
451 | int count = 0; | |
452 | struct lwp_info *lp; | |
453 | ||
454 | for (lp = lwp_list; lp; lp = lp->next) | |
455 | if (ptid_get_pid (lp->ptid) == pid) | |
456 | count++; | |
457 | ||
458 | return count; | |
459 | } | |
460 | ||
461 | /* Call delete_lwp with prototype compatible for make_cleanup. */ | |
462 | ||
463 | static void | |
464 | delete_lwp_cleanup (void *lp_voidp) | |
465 | { | |
9a3c8263 | 466 | struct lwp_info *lp = (struct lwp_info *) lp_voidp; |
4403d8e9 JK |
467 | |
468 | delete_lwp (lp->ptid); | |
469 | } | |
470 | ||
d83ad864 DB |
471 | /* Target hook for follow_fork. On entry inferior_ptid must be the |
472 | ptid of the followed inferior. At return, inferior_ptid will be | |
473 | unchanged. */ | |
474 | ||
6d8fd2b7 | 475 | static int |
07107ca6 LM |
476 | linux_child_follow_fork (struct target_ops *ops, int follow_child, |
477 | int detach_fork) | |
3993f6b1 | 478 | { |
d83ad864 | 479 | if (!follow_child) |
4de4c07c | 480 | { |
6c95b8df | 481 | struct lwp_info *child_lp = NULL; |
d83ad864 | 482 | int status = W_STOPCODE (0); |
d83ad864 | 483 | int has_vforked; |
79639e11 | 484 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
485 | int parent_pid, child_pid; |
486 | ||
487 | has_vforked = (inferior_thread ()->pending_follow.kind | |
488 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
489 | parent_ptid = inferior_ptid; |
490 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
491 | parent_pid = ptid_get_lwp (parent_ptid); | |
492 | child_pid = ptid_get_lwp (child_ptid); | |
4de4c07c | 493 | |
1777feb0 | 494 | /* We're already attached to the parent, by default. */ |
2989a365 | 495 | child_lp = add_lwp (child_ptid); |
d83ad864 DB |
496 | child_lp->stopped = 1; |
497 | child_lp->last_resume_kind = resume_stop; | |
4de4c07c | 498 | |
ac264b3b MS |
499 | /* Detach new forked process? */ |
500 | if (detach_fork) | |
f75c00e4 | 501 | { |
2989a365 TT |
502 | struct cleanup *old_chain = make_cleanup (delete_lwp_cleanup, |
503 | child_lp); | |
4403d8e9 | 504 | |
4403d8e9 JK |
505 | if (linux_nat_prepare_to_resume != NULL) |
506 | linux_nat_prepare_to_resume (child_lp); | |
c077881a HZ |
507 | |
508 | /* When debugging an inferior in an architecture that supports | |
509 | hardware single stepping on a kernel without commit | |
510 | 6580807da14c423f0d0a708108e6df6ebc8bc83d, the vfork child | |
511 | process starts with the TIF_SINGLESTEP/X86_EFLAGS_TF bits | |
512 | set if the parent process had them set. | |
513 | To work around this, single step the child process | |
514 | once before detaching to clear the flags. */ | |
515 | ||
2fd9d7ca PA |
516 | /* Note that we consult the parent's architecture instead of |
517 | the child's because there's no inferior for the child at | |
518 | this point. */ | |
c077881a | 519 | if (!gdbarch_software_single_step_p (target_thread_architecture |
2fd9d7ca | 520 | (parent_ptid))) |
c077881a | 521 | { |
c077881a HZ |
522 | linux_disable_event_reporting (child_pid); |
523 | if (ptrace (PTRACE_SINGLESTEP, child_pid, 0, 0) < 0) | |
524 | perror_with_name (_("Couldn't do single step")); | |
525 | if (my_waitpid (child_pid, &status, 0) < 0) | |
526 | perror_with_name (_("Couldn't wait vfork process")); | |
527 | } | |
528 | ||
529 | if (WIFSTOPPED (status)) | |
9caaaa83 PA |
530 | { |
531 | int signo; | |
532 | ||
533 | signo = WSTOPSIG (status); | |
534 | if (signo != 0 | |
535 | && !signal_pass_state (gdb_signal_from_host (signo))) | |
536 | signo = 0; | |
537 | ptrace (PTRACE_DETACH, child_pid, 0, signo); | |
538 | } | |
4403d8e9 JK |
539 | |
540 | do_cleanups (old_chain); | |
ac264b3b MS |
541 | } |
542 | else | |
543 | { | |
2989a365 TT |
544 | scoped_restore save_inferior_ptid |
545 | = make_scoped_restore (&inferior_ptid); | |
546 | inferior_ptid = child_ptid; | |
547 | ||
6c95b8df | 548 | /* Let the thread_db layer learn about this new process. */ |
2277426b | 549 | check_for_thread_db (); |
ac264b3b | 550 | } |
9016a515 DJ |
551 | |
552 | if (has_vforked) | |
553 | { | |
3ced3da4 | 554 | struct lwp_info *parent_lp; |
6c95b8df | 555 | |
79639e11 | 556 | parent_lp = find_lwp_pid (parent_ptid); |
96d7229d | 557 | gdb_assert (linux_supports_tracefork () >= 0); |
3ced3da4 | 558 | |
96d7229d | 559 | if (linux_supports_tracevforkdone ()) |
9016a515 | 560 | { |
6c95b8df PA |
561 | if (debug_linux_nat) |
562 | fprintf_unfiltered (gdb_stdlog, | |
563 | "LCFF: waiting for VFORK_DONE on %d\n", | |
564 | parent_pid); | |
3ced3da4 | 565 | parent_lp->stopped = 1; |
9016a515 | 566 | |
6c95b8df PA |
567 | /* We'll handle the VFORK_DONE event like any other |
568 | event, in target_wait. */ | |
9016a515 DJ |
569 | } |
570 | else | |
571 | { | |
572 | /* We can't insert breakpoints until the child has | |
573 | finished with the shared memory region. We need to | |
574 | wait until that happens. Ideal would be to just | |
575 | call: | |
576 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
577 | - waitpid (parent_pid, &status, __WALL); | |
578 | However, most architectures can't handle a syscall | |
579 | being traced on the way out if it wasn't traced on | |
580 | the way in. | |
581 | ||
582 | We might also think to loop, continuing the child | |
583 | until it exits or gets a SIGTRAP. One problem is | |
584 | that the child might call ptrace with PTRACE_TRACEME. | |
585 | ||
586 | There's no simple and reliable way to figure out when | |
587 | the vforked child will be done with its copy of the | |
588 | shared memory. We could step it out of the syscall, | |
589 | two instructions, let it go, and then single-step the | |
590 | parent once. When we have hardware single-step, this | |
591 | would work; with software single-step it could still | |
592 | be made to work but we'd have to be able to insert | |
593 | single-step breakpoints in the child, and we'd have | |
594 | to insert -just- the single-step breakpoint in the | |
595 | parent. Very awkward. | |
596 | ||
597 | In the end, the best we can do is to make sure it | |
598 | runs for a little while. Hopefully it will be out of | |
599 | range of any breakpoints we reinsert. Usually this | |
600 | is only the single-step breakpoint at vfork's return | |
601 | point. */ | |
602 | ||
6c95b8df PA |
603 | if (debug_linux_nat) |
604 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
605 | "LCFF: no VFORK_DONE " |
606 | "support, sleeping a bit\n"); | |
6c95b8df | 607 | |
9016a515 | 608 | usleep (10000); |
9016a515 | 609 | |
6c95b8df PA |
610 | /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event, |
611 | and leave it pending. The next linux_nat_resume call | |
612 | will notice a pending event, and bypasses actually | |
613 | resuming the inferior. */ | |
3ced3da4 PA |
614 | parent_lp->status = 0; |
615 | parent_lp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
616 | parent_lp->stopped = 1; | |
6c95b8df PA |
617 | |
618 | /* If we're in async mode, need to tell the event loop | |
619 | there's something here to process. */ | |
d9d41e78 | 620 | if (target_is_async_p ()) |
6c95b8df PA |
621 | async_file_mark (); |
622 | } | |
9016a515 | 623 | } |
4de4c07c | 624 | } |
3993f6b1 | 625 | else |
4de4c07c | 626 | { |
3ced3da4 | 627 | struct lwp_info *child_lp; |
4de4c07c | 628 | |
3ced3da4 PA |
629 | child_lp = add_lwp (inferior_ptid); |
630 | child_lp->stopped = 1; | |
25289eb2 | 631 | child_lp->last_resume_kind = resume_stop; |
6c95b8df | 632 | |
6c95b8df | 633 | /* Let the thread_db layer learn about this new process. */ |
ef29ce1a | 634 | check_for_thread_db (); |
4de4c07c DJ |
635 | } |
636 | ||
637 | return 0; | |
638 | } | |
639 | ||
4de4c07c | 640 | \f |
77b06cd7 | 641 | static int |
a863b201 | 642 | linux_child_insert_fork_catchpoint (struct target_ops *self, int pid) |
4de4c07c | 643 | { |
96d7229d | 644 | return !linux_supports_tracefork (); |
3993f6b1 DJ |
645 | } |
646 | ||
eb73ad13 | 647 | static int |
973fc227 | 648 | linux_child_remove_fork_catchpoint (struct target_ops *self, int pid) |
eb73ad13 PA |
649 | { |
650 | return 0; | |
651 | } | |
652 | ||
77b06cd7 | 653 | static int |
3ecc7da0 | 654 | linux_child_insert_vfork_catchpoint (struct target_ops *self, int pid) |
3993f6b1 | 655 | { |
96d7229d | 656 | return !linux_supports_tracefork (); |
3993f6b1 DJ |
657 | } |
658 | ||
eb73ad13 | 659 | static int |
e98cf0cd | 660 | linux_child_remove_vfork_catchpoint (struct target_ops *self, int pid) |
eb73ad13 PA |
661 | { |
662 | return 0; | |
663 | } | |
664 | ||
77b06cd7 | 665 | static int |
ba025e51 | 666 | linux_child_insert_exec_catchpoint (struct target_ops *self, int pid) |
3993f6b1 | 667 | { |
96d7229d | 668 | return !linux_supports_tracefork (); |
3993f6b1 DJ |
669 | } |
670 | ||
eb73ad13 | 671 | static int |
758e29d2 | 672 | linux_child_remove_exec_catchpoint (struct target_ops *self, int pid) |
eb73ad13 PA |
673 | { |
674 | return 0; | |
675 | } | |
676 | ||
a96d9b2e | 677 | static int |
ff214e67 | 678 | linux_child_set_syscall_catchpoint (struct target_ops *self, |
649a140c PA |
679 | int pid, bool needed, int any_count, |
680 | gdb::array_view<const int> syscall_counts) | |
a96d9b2e | 681 | { |
96d7229d | 682 | if (!linux_supports_tracesysgood ()) |
77b06cd7 TJB |
683 | return 1; |
684 | ||
a96d9b2e SDJ |
685 | /* On GNU/Linux, we ignore the arguments. It means that we only |
686 | enable the syscall catchpoints, but do not disable them. | |
77b06cd7 | 687 | |
649a140c | 688 | Also, we do not use the `syscall_counts' information because we do not |
a96d9b2e SDJ |
689 | filter system calls here. We let GDB do the logic for us. */ |
690 | return 0; | |
691 | } | |
692 | ||
774113b0 PA |
693 | /* List of known LWPs, keyed by LWP PID. This speeds up the common |
694 | case of mapping a PID returned from the kernel to our corresponding | |
695 | lwp_info data structure. */ | |
696 | static htab_t lwp_lwpid_htab; | |
697 | ||
698 | /* Calculate a hash from a lwp_info's LWP PID. */ | |
699 | ||
700 | static hashval_t | |
701 | lwp_info_hash (const void *ap) | |
702 | { | |
703 | const struct lwp_info *lp = (struct lwp_info *) ap; | |
704 | pid_t pid = ptid_get_lwp (lp->ptid); | |
705 | ||
706 | return iterative_hash_object (pid, 0); | |
707 | } | |
708 | ||
709 | /* Equality function for the lwp_info hash table. Compares the LWP's | |
710 | PID. */ | |
711 | ||
712 | static int | |
713 | lwp_lwpid_htab_eq (const void *a, const void *b) | |
714 | { | |
715 | const struct lwp_info *entry = (const struct lwp_info *) a; | |
716 | const struct lwp_info *element = (const struct lwp_info *) b; | |
717 | ||
718 | return ptid_get_lwp (entry->ptid) == ptid_get_lwp (element->ptid); | |
719 | } | |
720 | ||
721 | /* Create the lwp_lwpid_htab hash table. */ | |
722 | ||
723 | static void | |
724 | lwp_lwpid_htab_create (void) | |
725 | { | |
726 | lwp_lwpid_htab = htab_create (100, lwp_info_hash, lwp_lwpid_htab_eq, NULL); | |
727 | } | |
728 | ||
729 | /* Add LP to the hash table. */ | |
730 | ||
731 | static void | |
732 | lwp_lwpid_htab_add_lwp (struct lwp_info *lp) | |
733 | { | |
734 | void **slot; | |
735 | ||
736 | slot = htab_find_slot (lwp_lwpid_htab, lp, INSERT); | |
737 | gdb_assert (slot != NULL && *slot == NULL); | |
738 | *slot = lp; | |
739 | } | |
740 | ||
741 | /* Head of doubly-linked list of known LWPs. Sorted by reverse | |
742 | creation order. This order is assumed in some cases. E.g., | |
743 | reaping status after killing alls lwps of a process: the leader LWP | |
744 | must be reaped last. */ | |
9f0bdab8 | 745 | struct lwp_info *lwp_list; |
774113b0 PA |
746 | |
747 | /* Add LP to sorted-by-reverse-creation-order doubly-linked list. */ | |
748 | ||
749 | static void | |
750 | lwp_list_add (struct lwp_info *lp) | |
751 | { | |
752 | lp->next = lwp_list; | |
753 | if (lwp_list != NULL) | |
754 | lwp_list->prev = lp; | |
755 | lwp_list = lp; | |
756 | } | |
757 | ||
758 | /* Remove LP from sorted-by-reverse-creation-order doubly-linked | |
759 | list. */ | |
760 | ||
761 | static void | |
762 | lwp_list_remove (struct lwp_info *lp) | |
763 | { | |
764 | /* Remove from sorted-by-creation-order list. */ | |
765 | if (lp->next != NULL) | |
766 | lp->next->prev = lp->prev; | |
767 | if (lp->prev != NULL) | |
768 | lp->prev->next = lp->next; | |
769 | if (lp == lwp_list) | |
770 | lwp_list = lp->next; | |
771 | } | |
772 | ||
d6b0e80f AC |
773 | \f |
774 | ||
d6b0e80f AC |
775 | /* Original signal mask. */ |
776 | static sigset_t normal_mask; | |
777 | ||
778 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
779 | _initialize_linux_nat. */ | |
780 | static sigset_t suspend_mask; | |
781 | ||
7feb7d06 PA |
782 | /* Signals to block to make that sigsuspend work. */ |
783 | static sigset_t blocked_mask; | |
784 | ||
785 | /* SIGCHLD action. */ | |
786 | struct sigaction sigchld_action; | |
b84876c2 | 787 | |
7feb7d06 PA |
788 | /* Block child signals (SIGCHLD and linux threads signals), and store |
789 | the previous mask in PREV_MASK. */ | |
84e46146 | 790 | |
7feb7d06 PA |
791 | static void |
792 | block_child_signals (sigset_t *prev_mask) | |
793 | { | |
794 | /* Make sure SIGCHLD is blocked. */ | |
795 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
796 | sigaddset (&blocked_mask, SIGCHLD); | |
797 | ||
798 | sigprocmask (SIG_BLOCK, &blocked_mask, prev_mask); | |
799 | } | |
800 | ||
801 | /* Restore child signals mask, previously returned by | |
802 | block_child_signals. */ | |
803 | ||
804 | static void | |
805 | restore_child_signals_mask (sigset_t *prev_mask) | |
806 | { | |
807 | sigprocmask (SIG_SETMASK, prev_mask, NULL); | |
808 | } | |
2455069d UW |
809 | |
810 | /* Mask of signals to pass directly to the inferior. */ | |
811 | static sigset_t pass_mask; | |
812 | ||
813 | /* Update signals to pass to the inferior. */ | |
814 | static void | |
94bedb42 TT |
815 | linux_nat_pass_signals (struct target_ops *self, |
816 | int numsigs, unsigned char *pass_signals) | |
2455069d UW |
817 | { |
818 | int signo; | |
819 | ||
820 | sigemptyset (&pass_mask); | |
821 | ||
822 | for (signo = 1; signo < NSIG; signo++) | |
823 | { | |
2ea28649 | 824 | int target_signo = gdb_signal_from_host (signo); |
2455069d UW |
825 | if (target_signo < numsigs && pass_signals[target_signo]) |
826 | sigaddset (&pass_mask, signo); | |
827 | } | |
828 | } | |
829 | ||
d6b0e80f AC |
830 | \f |
831 | ||
832 | /* Prototypes for local functions. */ | |
833 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
8dd27370 | 834 | static char *linux_child_pid_to_exec_file (struct target_ops *self, int pid); |
20ba1ce6 | 835 | static int resume_stopped_resumed_lwps (struct lwp_info *lp, void *data); |
ced2dffb | 836 | static int check_ptrace_stopped_lwp_gone (struct lwp_info *lp); |
710151dd | 837 | |
d6b0e80f | 838 | \f |
d6b0e80f | 839 | |
7b50312a PA |
840 | /* Destroy and free LP. */ |
841 | ||
842 | static void | |
843 | lwp_free (struct lwp_info *lp) | |
844 | { | |
466eecee SM |
845 | /* Let the arch specific bits release arch_lwp_info. */ |
846 | if (linux_nat_delete_thread != NULL) | |
847 | linux_nat_delete_thread (lp->arch_private); | |
848 | else | |
849 | gdb_assert (lp->arch_private == NULL); | |
850 | ||
7b50312a PA |
851 | xfree (lp); |
852 | } | |
853 | ||
774113b0 | 854 | /* Traversal function for purge_lwp_list. */ |
d90e17a7 | 855 | |
774113b0 PA |
856 | static int |
857 | lwp_lwpid_htab_remove_pid (void **slot, void *info) | |
d90e17a7 | 858 | { |
774113b0 PA |
859 | struct lwp_info *lp = (struct lwp_info *) *slot; |
860 | int pid = *(int *) info; | |
d90e17a7 | 861 | |
774113b0 | 862 | if (ptid_get_pid (lp->ptid) == pid) |
d90e17a7 | 863 | { |
774113b0 PA |
864 | htab_clear_slot (lwp_lwpid_htab, slot); |
865 | lwp_list_remove (lp); | |
866 | lwp_free (lp); | |
867 | } | |
d90e17a7 | 868 | |
774113b0 PA |
869 | return 1; |
870 | } | |
d90e17a7 | 871 | |
774113b0 PA |
872 | /* Remove all LWPs belong to PID from the lwp list. */ |
873 | ||
874 | static void | |
875 | purge_lwp_list (int pid) | |
876 | { | |
877 | htab_traverse_noresize (lwp_lwpid_htab, lwp_lwpid_htab_remove_pid, &pid); | |
d90e17a7 PA |
878 | } |
879 | ||
26cb8b7c PA |
880 | /* Add the LWP specified by PTID to the list. PTID is the first LWP |
881 | in the process. Return a pointer to the structure describing the | |
882 | new LWP. | |
883 | ||
884 | This differs from add_lwp in that we don't let the arch specific | |
885 | bits know about this new thread. Current clients of this callback | |
886 | take the opportunity to install watchpoints in the new thread, and | |
887 | we shouldn't do that for the first thread. If we're spawning a | |
888 | child ("run"), the thread executes the shell wrapper first, and we | |
889 | shouldn't touch it until it execs the program we want to debug. | |
890 | For "attach", it'd be okay to call the callback, but it's not | |
891 | necessary, because watchpoints can't yet have been inserted into | |
892 | the inferior. */ | |
d6b0e80f AC |
893 | |
894 | static struct lwp_info * | |
26cb8b7c | 895 | add_initial_lwp (ptid_t ptid) |
d6b0e80f AC |
896 | { |
897 | struct lwp_info *lp; | |
898 | ||
dfd4cc63 | 899 | gdb_assert (ptid_lwp_p (ptid)); |
d6b0e80f | 900 | |
8d749320 | 901 | lp = XNEW (struct lwp_info); |
d6b0e80f AC |
902 | |
903 | memset (lp, 0, sizeof (struct lwp_info)); | |
904 | ||
25289eb2 | 905 | lp->last_resume_kind = resume_continue; |
d6b0e80f AC |
906 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; |
907 | ||
908 | lp->ptid = ptid; | |
dc146f7c | 909 | lp->core = -1; |
d6b0e80f | 910 | |
774113b0 PA |
911 | /* Add to sorted-by-reverse-creation-order list. */ |
912 | lwp_list_add (lp); | |
913 | ||
914 | /* Add to keyed-by-pid htab. */ | |
915 | lwp_lwpid_htab_add_lwp (lp); | |
d6b0e80f | 916 | |
26cb8b7c PA |
917 | return lp; |
918 | } | |
919 | ||
920 | /* Add the LWP specified by PID to the list. Return a pointer to the | |
921 | structure describing the new LWP. The LWP should already be | |
922 | stopped. */ | |
923 | ||
924 | static struct lwp_info * | |
925 | add_lwp (ptid_t ptid) | |
926 | { | |
927 | struct lwp_info *lp; | |
928 | ||
929 | lp = add_initial_lwp (ptid); | |
930 | ||
6e012a6c PA |
931 | /* Let the arch specific bits know about this new thread. Current |
932 | clients of this callback take the opportunity to install | |
26cb8b7c PA |
933 | watchpoints in the new thread. We don't do this for the first |
934 | thread though. See add_initial_lwp. */ | |
935 | if (linux_nat_new_thread != NULL) | |
7b50312a | 936 | linux_nat_new_thread (lp); |
9f0bdab8 | 937 | |
d6b0e80f AC |
938 | return lp; |
939 | } | |
940 | ||
941 | /* Remove the LWP specified by PID from the list. */ | |
942 | ||
943 | static void | |
944 | delete_lwp (ptid_t ptid) | |
945 | { | |
774113b0 PA |
946 | struct lwp_info *lp; |
947 | void **slot; | |
948 | struct lwp_info dummy; | |
d6b0e80f | 949 | |
774113b0 PA |
950 | dummy.ptid = ptid; |
951 | slot = htab_find_slot (lwp_lwpid_htab, &dummy, NO_INSERT); | |
952 | if (slot == NULL) | |
953 | return; | |
d6b0e80f | 954 | |
774113b0 PA |
955 | lp = *(struct lwp_info **) slot; |
956 | gdb_assert (lp != NULL); | |
d6b0e80f | 957 | |
774113b0 | 958 | htab_clear_slot (lwp_lwpid_htab, slot); |
d6b0e80f | 959 | |
774113b0 PA |
960 | /* Remove from sorted-by-creation-order list. */ |
961 | lwp_list_remove (lp); | |
d6b0e80f | 962 | |
774113b0 | 963 | /* Release. */ |
7b50312a | 964 | lwp_free (lp); |
d6b0e80f AC |
965 | } |
966 | ||
967 | /* Return a pointer to the structure describing the LWP corresponding | |
968 | to PID. If no corresponding LWP could be found, return NULL. */ | |
969 | ||
970 | static struct lwp_info * | |
971 | find_lwp_pid (ptid_t ptid) | |
972 | { | |
973 | struct lwp_info *lp; | |
974 | int lwp; | |
774113b0 | 975 | struct lwp_info dummy; |
d6b0e80f | 976 | |
dfd4cc63 LM |
977 | if (ptid_lwp_p (ptid)) |
978 | lwp = ptid_get_lwp (ptid); | |
d6b0e80f | 979 | else |
dfd4cc63 | 980 | lwp = ptid_get_pid (ptid); |
d6b0e80f | 981 | |
774113b0 PA |
982 | dummy.ptid = ptid_build (0, lwp, 0); |
983 | lp = (struct lwp_info *) htab_find (lwp_lwpid_htab, &dummy); | |
984 | return lp; | |
d6b0e80f AC |
985 | } |
986 | ||
6d4ee8c6 | 987 | /* See nat/linux-nat.h. */ |
d6b0e80f AC |
988 | |
989 | struct lwp_info * | |
d90e17a7 | 990 | iterate_over_lwps (ptid_t filter, |
6d4ee8c6 | 991 | iterate_over_lwps_ftype callback, |
d90e17a7 | 992 | void *data) |
d6b0e80f AC |
993 | { |
994 | struct lwp_info *lp, *lpnext; | |
995 | ||
996 | for (lp = lwp_list; lp; lp = lpnext) | |
997 | { | |
998 | lpnext = lp->next; | |
d90e17a7 PA |
999 | |
1000 | if (ptid_match (lp->ptid, filter)) | |
1001 | { | |
6d4ee8c6 | 1002 | if ((*callback) (lp, data) != 0) |
d90e17a7 PA |
1003 | return lp; |
1004 | } | |
d6b0e80f AC |
1005 | } |
1006 | ||
1007 | return NULL; | |
1008 | } | |
1009 | ||
2277426b PA |
1010 | /* Update our internal state when changing from one checkpoint to |
1011 | another indicated by NEW_PTID. We can only switch single-threaded | |
1012 | applications, so we only create one new LWP, and the previous list | |
1013 | is discarded. */ | |
f973ed9c DJ |
1014 | |
1015 | void | |
1016 | linux_nat_switch_fork (ptid_t new_ptid) | |
1017 | { | |
1018 | struct lwp_info *lp; | |
1019 | ||
dfd4cc63 | 1020 | purge_lwp_list (ptid_get_pid (inferior_ptid)); |
2277426b | 1021 | |
f973ed9c DJ |
1022 | lp = add_lwp (new_ptid); |
1023 | lp->stopped = 1; | |
e26af52f | 1024 | |
2277426b PA |
1025 | /* This changes the thread's ptid while preserving the gdb thread |
1026 | num. Also changes the inferior pid, while preserving the | |
1027 | inferior num. */ | |
1028 | thread_change_ptid (inferior_ptid, new_ptid); | |
1029 | ||
1030 | /* We've just told GDB core that the thread changed target id, but, | |
1031 | in fact, it really is a different thread, with different register | |
1032 | contents. */ | |
1033 | registers_changed (); | |
e26af52f DJ |
1034 | } |
1035 | ||
e26af52f DJ |
1036 | /* Handle the exit of a single thread LP. */ |
1037 | ||
1038 | static void | |
1039 | exit_lwp (struct lwp_info *lp) | |
1040 | { | |
e09875d4 | 1041 | struct thread_info *th = find_thread_ptid (lp->ptid); |
063bfe2e VP |
1042 | |
1043 | if (th) | |
e26af52f | 1044 | { |
17faa917 DJ |
1045 | if (print_thread_events) |
1046 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1047 | ||
4f8d22e3 | 1048 | delete_thread (lp->ptid); |
e26af52f DJ |
1049 | } |
1050 | ||
1051 | delete_lwp (lp->ptid); | |
1052 | } | |
1053 | ||
a0ef4274 DJ |
1054 | /* Wait for the LWP specified by LP, which we have just attached to. |
1055 | Returns a wait status for that LWP, to cache. */ | |
1056 | ||
1057 | static int | |
22827c51 | 1058 | linux_nat_post_attach_wait (ptid_t ptid, int *signalled) |
a0ef4274 | 1059 | { |
dfd4cc63 | 1060 | pid_t new_pid, pid = ptid_get_lwp (ptid); |
a0ef4274 DJ |
1061 | int status; |
1062 | ||
644cebc9 | 1063 | if (linux_proc_pid_is_stopped (pid)) |
a0ef4274 DJ |
1064 | { |
1065 | if (debug_linux_nat) | |
1066 | fprintf_unfiltered (gdb_stdlog, | |
1067 | "LNPAW: Attaching to a stopped process\n"); | |
1068 | ||
1069 | /* The process is definitely stopped. It is in a job control | |
1070 | stop, unless the kernel predates the TASK_STOPPED / | |
1071 | TASK_TRACED distinction, in which case it might be in a | |
1072 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1073 | can kill it, signal it, et cetera. | |
1074 | ||
1075 | First make sure there is a pending SIGSTOP. Since we are | |
1076 | already attached, the process can not transition from stopped | |
1077 | to running without a PTRACE_CONT; so we know this signal will | |
1078 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1079 | probably already in the queue (unless this kernel is old | |
1080 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1081 | is not an RT signal, it can only be queued once. */ | |
1082 | kill_lwp (pid, SIGSTOP); | |
1083 | ||
1084 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1085 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1086 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1087 | } | |
1088 | ||
1089 | /* Make sure the initial process is stopped. The user-level threads | |
1090 | layer might want to poke around in the inferior, and that won't | |
1091 | work if things haven't stabilized yet. */ | |
4a6ed09b | 1092 | new_pid = my_waitpid (pid, &status, __WALL); |
dacc9cb2 PP |
1093 | gdb_assert (pid == new_pid); |
1094 | ||
1095 | if (!WIFSTOPPED (status)) | |
1096 | { | |
1097 | /* The pid we tried to attach has apparently just exited. */ | |
1098 | if (debug_linux_nat) | |
1099 | fprintf_unfiltered (gdb_stdlog, "LNPAW: Failed to stop %d: %s", | |
1100 | pid, status_to_str (status)); | |
1101 | return status; | |
1102 | } | |
a0ef4274 DJ |
1103 | |
1104 | if (WSTOPSIG (status) != SIGSTOP) | |
1105 | { | |
1106 | *signalled = 1; | |
1107 | if (debug_linux_nat) | |
1108 | fprintf_unfiltered (gdb_stdlog, | |
1109 | "LNPAW: Received %s after attaching\n", | |
1110 | status_to_str (status)); | |
1111 | } | |
1112 | ||
1113 | return status; | |
1114 | } | |
1115 | ||
b84876c2 | 1116 | static void |
136d6dae | 1117 | linux_nat_create_inferior (struct target_ops *ops, |
7c5ded6a SDJ |
1118 | const char *exec_file, const std::string &allargs, |
1119 | char **env, int from_tty) | |
b84876c2 | 1120 | { |
41272101 TT |
1121 | maybe_disable_address_space_randomization restore_personality |
1122 | (disable_randomization); | |
b84876c2 PA |
1123 | |
1124 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1125 | we have to mask the async mode. */ | |
1126 | ||
2455069d | 1127 | /* Make sure we report all signals during startup. */ |
94bedb42 | 1128 | linux_nat_pass_signals (ops, 0, NULL); |
2455069d | 1129 | |
136d6dae | 1130 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 PA |
1131 | } |
1132 | ||
8784d563 PA |
1133 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
1134 | already attached. Returns true if a new LWP is found, false | |
1135 | otherwise. */ | |
1136 | ||
1137 | static int | |
1138 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1139 | { | |
1140 | struct lwp_info *lp; | |
1141 | ||
1142 | /* Ignore LWPs we're already attached to. */ | |
1143 | lp = find_lwp_pid (ptid); | |
1144 | if (lp == NULL) | |
1145 | { | |
1146 | int lwpid = ptid_get_lwp (ptid); | |
1147 | ||
1148 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) < 0) | |
1149 | { | |
1150 | int err = errno; | |
1151 | ||
1152 | /* Be quiet if we simply raced with the thread exiting. | |
1153 | EPERM is returned if the thread's task still exists, and | |
1154 | is marked as exited or zombie, as well as other | |
1155 | conditions, so in that case, confirm the status in | |
1156 | /proc/PID/status. */ | |
1157 | if (err == ESRCH | |
1158 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
1159 | { | |
1160 | if (debug_linux_nat) | |
1161 | { | |
1162 | fprintf_unfiltered (gdb_stdlog, | |
1163 | "Cannot attach to lwp %d: " | |
1164 | "thread is gone (%d: %s)\n", | |
1165 | lwpid, err, safe_strerror (err)); | |
1166 | } | |
1167 | } | |
1168 | else | |
1169 | { | |
4d9b86e1 SM |
1170 | std::string reason |
1171 | = linux_ptrace_attach_fail_reason_string (ptid, err); | |
1172 | ||
f71f0b0d | 1173 | warning (_("Cannot attach to lwp %d: %s"), |
4d9b86e1 | 1174 | lwpid, reason.c_str ()); |
8784d563 PA |
1175 | } |
1176 | } | |
1177 | else | |
1178 | { | |
1179 | if (debug_linux_nat) | |
1180 | fprintf_unfiltered (gdb_stdlog, | |
1181 | "PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1182 | target_pid_to_str (ptid)); | |
1183 | ||
1184 | lp = add_lwp (ptid); | |
8784d563 PA |
1185 | |
1186 | /* The next time we wait for this LWP we'll see a SIGSTOP as | |
1187 | PTRACE_ATTACH brings it to a halt. */ | |
1188 | lp->signalled = 1; | |
1189 | ||
1190 | /* We need to wait for a stop before being able to make the | |
1191 | next ptrace call on this LWP. */ | |
1192 | lp->must_set_ptrace_flags = 1; | |
026a9174 PA |
1193 | |
1194 | /* So that wait collects the SIGSTOP. */ | |
1195 | lp->resumed = 1; | |
1196 | ||
1197 | /* Also add the LWP to gdb's thread list, in case a | |
1198 | matching libthread_db is not found (or the process uses | |
1199 | raw clone). */ | |
1200 | add_thread (lp->ptid); | |
1201 | set_running (lp->ptid, 1); | |
1202 | set_executing (lp->ptid, 1); | |
8784d563 PA |
1203 | } |
1204 | ||
1205 | return 1; | |
1206 | } | |
1207 | return 0; | |
1208 | } | |
1209 | ||
d6b0e80f | 1210 | static void |
c0939df1 | 1211 | linux_nat_attach (struct target_ops *ops, const char *args, int from_tty) |
d6b0e80f AC |
1212 | { |
1213 | struct lwp_info *lp; | |
d6b0e80f | 1214 | int status; |
af990527 | 1215 | ptid_t ptid; |
d6b0e80f | 1216 | |
2455069d | 1217 | /* Make sure we report all signals during attach. */ |
94bedb42 | 1218 | linux_nat_pass_signals (ops, 0, NULL); |
2455069d | 1219 | |
492d29ea | 1220 | TRY |
87b0bb13 JK |
1221 | { |
1222 | linux_ops->to_attach (ops, args, from_tty); | |
1223 | } | |
492d29ea | 1224 | CATCH (ex, RETURN_MASK_ERROR) |
87b0bb13 JK |
1225 | { |
1226 | pid_t pid = parse_pid_to_attach (args); | |
4d9b86e1 | 1227 | std::string reason = linux_ptrace_attach_fail_reason (pid); |
87b0bb13 | 1228 | |
4d9b86e1 SM |
1229 | if (!reason.empty ()) |
1230 | throw_error (ex.error, "warning: %s\n%s", reason.c_str (), ex.message); | |
7ae1a6a6 | 1231 | else |
a7b2d0fb | 1232 | throw_error (ex.error, "%s", ex.message); |
87b0bb13 | 1233 | } |
492d29ea | 1234 | END_CATCH |
d6b0e80f | 1235 | |
af990527 PA |
1236 | /* The ptrace base target adds the main thread with (pid,0,0) |
1237 | format. Decorate it with lwp info. */ | |
dfd4cc63 LM |
1238 | ptid = ptid_build (ptid_get_pid (inferior_ptid), |
1239 | ptid_get_pid (inferior_ptid), | |
1240 | 0); | |
af990527 PA |
1241 | thread_change_ptid (inferior_ptid, ptid); |
1242 | ||
9f0bdab8 | 1243 | /* Add the initial process as the first LWP to the list. */ |
26cb8b7c | 1244 | lp = add_initial_lwp (ptid); |
a0ef4274 | 1245 | |
22827c51 | 1246 | status = linux_nat_post_attach_wait (lp->ptid, &lp->signalled); |
dacc9cb2 PP |
1247 | if (!WIFSTOPPED (status)) |
1248 | { | |
1249 | if (WIFEXITED (status)) | |
1250 | { | |
1251 | int exit_code = WEXITSTATUS (status); | |
1252 | ||
223ffa71 | 1253 | target_terminal::ours (); |
bc1e6c81 | 1254 | target_mourn_inferior (inferior_ptid); |
dacc9cb2 PP |
1255 | if (exit_code == 0) |
1256 | error (_("Unable to attach: program exited normally.")); | |
1257 | else | |
1258 | error (_("Unable to attach: program exited with code %d."), | |
1259 | exit_code); | |
1260 | } | |
1261 | else if (WIFSIGNALED (status)) | |
1262 | { | |
2ea28649 | 1263 | enum gdb_signal signo; |
dacc9cb2 | 1264 | |
223ffa71 | 1265 | target_terminal::ours (); |
bc1e6c81 | 1266 | target_mourn_inferior (inferior_ptid); |
dacc9cb2 | 1267 | |
2ea28649 | 1268 | signo = gdb_signal_from_host (WTERMSIG (status)); |
dacc9cb2 PP |
1269 | error (_("Unable to attach: program terminated with signal " |
1270 | "%s, %s."), | |
2ea28649 PA |
1271 | gdb_signal_to_name (signo), |
1272 | gdb_signal_to_string (signo)); | |
dacc9cb2 PP |
1273 | } |
1274 | ||
1275 | internal_error (__FILE__, __LINE__, | |
1276 | _("unexpected status %d for PID %ld"), | |
dfd4cc63 | 1277 | status, (long) ptid_get_lwp (ptid)); |
dacc9cb2 PP |
1278 | } |
1279 | ||
a0ef4274 | 1280 | lp->stopped = 1; |
9f0bdab8 | 1281 | |
a0ef4274 | 1282 | /* Save the wait status to report later. */ |
d6b0e80f | 1283 | lp->resumed = 1; |
a0ef4274 DJ |
1284 | if (debug_linux_nat) |
1285 | fprintf_unfiltered (gdb_stdlog, | |
1286 | "LNA: waitpid %ld, saving status %s\n", | |
dfd4cc63 | 1287 | (long) ptid_get_pid (lp->ptid), status_to_str (status)); |
710151dd | 1288 | |
7feb7d06 PA |
1289 | lp->status = status; |
1290 | ||
8784d563 PA |
1291 | /* We must attach to every LWP. If /proc is mounted, use that to |
1292 | find them now. The inferior may be using raw clone instead of | |
1293 | using pthreads. But even if it is using pthreads, thread_db | |
1294 | walks structures in the inferior's address space to find the list | |
1295 | of threads/LWPs, and those structures may well be corrupted. | |
1296 | Note that once thread_db is loaded, we'll still use it to list | |
1297 | threads and associate pthread info with each LWP. */ | |
1298 | linux_proc_attach_tgid_threads (ptid_get_pid (lp->ptid), | |
1299 | attach_proc_task_lwp_callback); | |
1300 | ||
7feb7d06 | 1301 | if (target_can_async_p ()) |
6a3753b3 | 1302 | target_async (1); |
d6b0e80f AC |
1303 | } |
1304 | ||
ced2dffb PA |
1305 | /* Get pending signal of THREAD as a host signal number, for detaching |
1306 | purposes. This is the signal the thread last stopped for, which we | |
1307 | need to deliver to the thread when detaching, otherwise, it'd be | |
1308 | suppressed/lost. */ | |
1309 | ||
a0ef4274 | 1310 | static int |
ced2dffb | 1311 | get_detach_signal (struct lwp_info *lp) |
a0ef4274 | 1312 | { |
a493e3e2 | 1313 | enum gdb_signal signo = GDB_SIGNAL_0; |
ca2163eb PA |
1314 | |
1315 | /* If we paused threads momentarily, we may have stored pending | |
1316 | events in lp->status or lp->waitstatus (see stop_wait_callback), | |
1317 | and GDB core hasn't seen any signal for those threads. | |
1318 | Otherwise, the last signal reported to the core is found in the | |
1319 | thread object's stop_signal. | |
1320 | ||
1321 | There's a corner case that isn't handled here at present. Only | |
1322 | if the thread stopped with a TARGET_WAITKIND_STOPPED does | |
1323 | stop_signal make sense as a real signal to pass to the inferior. | |
1324 | Some catchpoint related events, like | |
1325 | TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set | |
a493e3e2 | 1326 | to GDB_SIGNAL_SIGTRAP when the catchpoint triggers. But, |
ca2163eb PA |
1327 | those traps are debug API (ptrace in our case) related and |
1328 | induced; the inferior wouldn't see them if it wasn't being | |
1329 | traced. Hence, we should never pass them to the inferior, even | |
1330 | when set to pass state. Since this corner case isn't handled by | |
1331 | infrun.c when proceeding with a signal, for consistency, neither | |
1332 | do we handle it here (or elsewhere in the file we check for | |
1333 | signal pass state). Normally SIGTRAP isn't set to pass state, so | |
1334 | this is really a corner case. */ | |
1335 | ||
1336 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
a493e3e2 | 1337 | signo = GDB_SIGNAL_0; /* a pending ptrace event, not a real signal. */ |
ca2163eb | 1338 | else if (lp->status) |
2ea28649 | 1339 | signo = gdb_signal_from_host (WSTOPSIG (lp->status)); |
fbea99ea | 1340 | else if (target_is_non_stop_p () && !is_executing (lp->ptid)) |
ca2163eb PA |
1341 | { |
1342 | struct thread_info *tp = find_thread_ptid (lp->ptid); | |
e0881a8e | 1343 | |
72b049d3 PA |
1344 | if (tp->suspend.waitstatus_pending_p) |
1345 | signo = tp->suspend.waitstatus.value.sig; | |
1346 | else | |
1347 | signo = tp->suspend.stop_signal; | |
ca2163eb | 1348 | } |
fbea99ea | 1349 | else if (!target_is_non_stop_p ()) |
a0ef4274 | 1350 | { |
ca2163eb PA |
1351 | struct target_waitstatus last; |
1352 | ptid_t last_ptid; | |
4c28f408 | 1353 | |
ca2163eb | 1354 | get_last_target_status (&last_ptid, &last); |
4c28f408 | 1355 | |
dfd4cc63 | 1356 | if (ptid_get_lwp (lp->ptid) == ptid_get_lwp (last_ptid)) |
ca2163eb | 1357 | { |
e09875d4 | 1358 | struct thread_info *tp = find_thread_ptid (lp->ptid); |
e0881a8e | 1359 | |
16c381f0 | 1360 | signo = tp->suspend.stop_signal; |
4c28f408 | 1361 | } |
ca2163eb | 1362 | } |
4c28f408 | 1363 | |
a493e3e2 | 1364 | if (signo == GDB_SIGNAL_0) |
ca2163eb PA |
1365 | { |
1366 | if (debug_linux_nat) | |
1367 | fprintf_unfiltered (gdb_stdlog, | |
1368 | "GPT: lwp %s has no pending signal\n", | |
1369 | target_pid_to_str (lp->ptid)); | |
1370 | } | |
1371 | else if (!signal_pass_state (signo)) | |
1372 | { | |
1373 | if (debug_linux_nat) | |
3e43a32a MS |
1374 | fprintf_unfiltered (gdb_stdlog, |
1375 | "GPT: lwp %s had signal %s, " | |
1376 | "but it is in no pass state\n", | |
ca2163eb | 1377 | target_pid_to_str (lp->ptid), |
2ea28649 | 1378 | gdb_signal_to_string (signo)); |
a0ef4274 | 1379 | } |
a0ef4274 | 1380 | else |
4c28f408 | 1381 | { |
ca2163eb PA |
1382 | if (debug_linux_nat) |
1383 | fprintf_unfiltered (gdb_stdlog, | |
1384 | "GPT: lwp %s has pending signal %s\n", | |
1385 | target_pid_to_str (lp->ptid), | |
2ea28649 | 1386 | gdb_signal_to_string (signo)); |
ced2dffb PA |
1387 | |
1388 | return gdb_signal_to_host (signo); | |
4c28f408 | 1389 | } |
a0ef4274 DJ |
1390 | |
1391 | return 0; | |
1392 | } | |
1393 | ||
ced2dffb PA |
1394 | /* Detach from LP. If SIGNO_P is non-NULL, then it points to the |
1395 | signal number that should be passed to the LWP when detaching. | |
1396 | Otherwise pass any pending signal the LWP may have, if any. */ | |
1397 | ||
1398 | static void | |
1399 | detach_one_lwp (struct lwp_info *lp, int *signo_p) | |
d6b0e80f | 1400 | { |
ced2dffb PA |
1401 | int lwpid = ptid_get_lwp (lp->ptid); |
1402 | int signo; | |
1403 | ||
d6b0e80f AC |
1404 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); |
1405 | ||
1406 | if (debug_linux_nat && lp->status) | |
1407 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1408 | strsignal (WSTOPSIG (lp->status)), | |
1409 | target_pid_to_str (lp->ptid)); | |
1410 | ||
a0ef4274 DJ |
1411 | /* If there is a pending SIGSTOP, get rid of it. */ |
1412 | if (lp->signalled) | |
d6b0e80f | 1413 | { |
d6b0e80f AC |
1414 | if (debug_linux_nat) |
1415 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1416 | "DC: Sending SIGCONT to %s\n", |
1417 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1418 | |
ced2dffb | 1419 | kill_lwp (lwpid, SIGCONT); |
d6b0e80f | 1420 | lp->signalled = 0; |
d6b0e80f AC |
1421 | } |
1422 | ||
ced2dffb | 1423 | if (signo_p == NULL) |
d6b0e80f | 1424 | { |
a0ef4274 | 1425 | /* Pass on any pending signal for this LWP. */ |
ced2dffb PA |
1426 | signo = get_detach_signal (lp); |
1427 | } | |
1428 | else | |
1429 | signo = *signo_p; | |
a0ef4274 | 1430 | |
ced2dffb PA |
1431 | /* Preparing to resume may try to write registers, and fail if the |
1432 | lwp is zombie. If that happens, ignore the error. We'll handle | |
1433 | it below, when detach fails with ESRCH. */ | |
1434 | TRY | |
1435 | { | |
7b50312a PA |
1436 | if (linux_nat_prepare_to_resume != NULL) |
1437 | linux_nat_prepare_to_resume (lp); | |
ced2dffb PA |
1438 | } |
1439 | CATCH (ex, RETURN_MASK_ERROR) | |
1440 | { | |
1441 | if (!check_ptrace_stopped_lwp_gone (lp)) | |
1442 | throw_exception (ex); | |
1443 | } | |
1444 | END_CATCH | |
d6b0e80f | 1445 | |
ced2dffb PA |
1446 | if (ptrace (PTRACE_DETACH, lwpid, 0, signo) < 0) |
1447 | { | |
1448 | int save_errno = errno; | |
1449 | ||
1450 | /* We know the thread exists, so ESRCH must mean the lwp is | |
1451 | zombie. This can happen if one of the already-detached | |
1452 | threads exits the whole thread group. In that case we're | |
1453 | still attached, and must reap the lwp. */ | |
1454 | if (save_errno == ESRCH) | |
1455 | { | |
1456 | int ret, status; | |
d6b0e80f | 1457 | |
ced2dffb PA |
1458 | ret = my_waitpid (lwpid, &status, __WALL); |
1459 | if (ret == -1) | |
1460 | { | |
1461 | warning (_("Couldn't reap LWP %d while detaching: %s"), | |
1462 | lwpid, strerror (errno)); | |
1463 | } | |
1464 | else if (!WIFEXITED (status) && !WIFSIGNALED (status)) | |
1465 | { | |
1466 | warning (_("Reaping LWP %d while detaching " | |
1467 | "returned unexpected status 0x%x"), | |
1468 | lwpid, status); | |
1469 | } | |
1470 | } | |
1471 | else | |
1472 | { | |
1473 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), | |
1474 | safe_strerror (save_errno)); | |
1475 | } | |
d6b0e80f | 1476 | } |
ced2dffb PA |
1477 | else if (debug_linux_nat) |
1478 | { | |
1479 | fprintf_unfiltered (gdb_stdlog, | |
1480 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1481 | target_pid_to_str (lp->ptid), | |
1482 | strsignal (signo)); | |
1483 | } | |
1484 | ||
1485 | delete_lwp (lp->ptid); | |
1486 | } | |
d6b0e80f | 1487 | |
ced2dffb PA |
1488 | static int |
1489 | detach_callback (struct lwp_info *lp, void *data) | |
1490 | { | |
1491 | /* We don't actually detach from the thread group leader just yet. | |
1492 | If the thread group exits, we must reap the zombie clone lwps | |
1493 | before we're able to reap the leader. */ | |
1494 | if (ptid_get_lwp (lp->ptid) != ptid_get_pid (lp->ptid)) | |
1495 | detach_one_lwp (lp, NULL); | |
d6b0e80f AC |
1496 | return 0; |
1497 | } | |
1498 | ||
1499 | static void | |
6e1e1966 | 1500 | linux_nat_detach (struct target_ops *ops, inferior *inf, int from_tty) |
d6b0e80f | 1501 | { |
b84876c2 | 1502 | int pid; |
d90e17a7 PA |
1503 | struct lwp_info *main_lwp; |
1504 | ||
dfd4cc63 | 1505 | pid = ptid_get_pid (inferior_ptid); |
a0ef4274 | 1506 | |
ae5e0686 MK |
1507 | /* Don't unregister from the event loop, as there may be other |
1508 | inferiors running. */ | |
b84876c2 | 1509 | |
4c28f408 PA |
1510 | /* Stop all threads before detaching. ptrace requires that the |
1511 | thread is stopped to sucessfully detach. */ | |
d90e17a7 | 1512 | iterate_over_lwps (pid_to_ptid (pid), stop_callback, NULL); |
4c28f408 PA |
1513 | /* ... and wait until all of them have reported back that |
1514 | they're no longer running. */ | |
d90e17a7 | 1515 | iterate_over_lwps (pid_to_ptid (pid), stop_wait_callback, NULL); |
4c28f408 | 1516 | |
d90e17a7 | 1517 | iterate_over_lwps (pid_to_ptid (pid), detach_callback, NULL); |
d6b0e80f AC |
1518 | |
1519 | /* Only the initial process should be left right now. */ | |
dfd4cc63 | 1520 | gdb_assert (num_lwps (ptid_get_pid (inferior_ptid)) == 1); |
d90e17a7 PA |
1521 | |
1522 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
d6b0e80f | 1523 | |
7a7d3353 PA |
1524 | if (forks_exist_p ()) |
1525 | { | |
1526 | /* Multi-fork case. The current inferior_ptid is being detached | |
1527 | from, but there are other viable forks to debug. Detach from | |
1528 | the current fork, and context-switch to the first | |
1529 | available. */ | |
6bd6f3b6 | 1530 | linux_fork_detach (from_tty); |
7a7d3353 PA |
1531 | } |
1532 | else | |
ced2dffb | 1533 | { |
ced2dffb PA |
1534 | target_announce_detach (from_tty); |
1535 | ||
6bd6f3b6 SM |
1536 | /* Pass on any pending signal for the last LWP. */ |
1537 | int signo = get_detach_signal (main_lwp); | |
ced2dffb PA |
1538 | |
1539 | detach_one_lwp (main_lwp, &signo); | |
1540 | ||
1541 | inf_ptrace_detach_success (ops); | |
1542 | } | |
d6b0e80f AC |
1543 | } |
1544 | ||
8a99810d PA |
1545 | /* Resume execution of the inferior process. If STEP is nonzero, |
1546 | single-step it. If SIGNAL is nonzero, give it that signal. */ | |
1547 | ||
1548 | static void | |
23f238d3 PA |
1549 | linux_resume_one_lwp_throw (struct lwp_info *lp, int step, |
1550 | enum gdb_signal signo) | |
8a99810d | 1551 | { |
8a99810d | 1552 | lp->step = step; |
9c02b525 PA |
1553 | |
1554 | /* stop_pc doubles as the PC the LWP had when it was last resumed. | |
1555 | We only presently need that if the LWP is stepped though (to | |
1556 | handle the case of stepping a breakpoint instruction). */ | |
1557 | if (step) | |
1558 | { | |
1559 | struct regcache *regcache = get_thread_regcache (lp->ptid); | |
1560 | ||
1561 | lp->stop_pc = regcache_read_pc (regcache); | |
1562 | } | |
1563 | else | |
1564 | lp->stop_pc = 0; | |
1565 | ||
8a99810d PA |
1566 | if (linux_nat_prepare_to_resume != NULL) |
1567 | linux_nat_prepare_to_resume (lp); | |
90ad5e1d | 1568 | linux_ops->to_resume (linux_ops, lp->ptid, step, signo); |
23f238d3 PA |
1569 | |
1570 | /* Successfully resumed. Clear state that no longer makes sense, | |
1571 | and mark the LWP as running. Must not do this before resuming | |
1572 | otherwise if that fails other code will be confused. E.g., we'd | |
1573 | later try to stop the LWP and hang forever waiting for a stop | |
1574 | status. Note that we must not throw after this is cleared, | |
1575 | otherwise handle_zombie_lwp_error would get confused. */ | |
8a99810d | 1576 | lp->stopped = 0; |
1ad3de98 | 1577 | lp->core = -1; |
23f238d3 | 1578 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8a99810d PA |
1579 | registers_changed_ptid (lp->ptid); |
1580 | } | |
1581 | ||
23f238d3 PA |
1582 | /* Called when we try to resume a stopped LWP and that errors out. If |
1583 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
1584 | or about to become), discard the error, clear any pending status | |
1585 | the LWP may have, and return true (we'll collect the exit status | |
1586 | soon enough). Otherwise, return false. */ | |
1587 | ||
1588 | static int | |
1589 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
1590 | { | |
1591 | /* If we get an error after resuming the LWP successfully, we'd | |
1592 | confuse !T state for the LWP being gone. */ | |
1593 | gdb_assert (lp->stopped); | |
1594 | ||
1595 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
1596 | because even if ptrace failed with ESRCH, the tracee may be "not | |
1597 | yet fully dead", but already refusing ptrace requests. In that | |
1598 | case the tracee has 'R (Running)' state for a little bit | |
1599 | (observed in Linux 3.18). See also the note on ESRCH in the | |
1600 | ptrace(2) man page. Instead, check whether the LWP has any state | |
1601 | other than ptrace-stopped. */ | |
1602 | ||
1603 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
1604 | if (linux_proc_pid_is_trace_stopped_nowarn (ptid_get_lwp (lp->ptid)) == 0) | |
1605 | { | |
1606 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
1607 | lp->status = 0; | |
1608 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
1609 | return 1; | |
1610 | } | |
1611 | return 0; | |
1612 | } | |
1613 | ||
1614 | /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP | |
1615 | disappears while we try to resume it. */ | |
1616 | ||
1617 | static void | |
1618 | linux_resume_one_lwp (struct lwp_info *lp, int step, enum gdb_signal signo) | |
1619 | { | |
1620 | TRY | |
1621 | { | |
1622 | linux_resume_one_lwp_throw (lp, step, signo); | |
1623 | } | |
1624 | CATCH (ex, RETURN_MASK_ERROR) | |
1625 | { | |
1626 | if (!check_ptrace_stopped_lwp_gone (lp)) | |
1627 | throw_exception (ex); | |
1628 | } | |
1629 | END_CATCH | |
1630 | } | |
1631 | ||
d6b0e80f AC |
1632 | /* Resume LP. */ |
1633 | ||
25289eb2 | 1634 | static void |
e5ef252a | 1635 | resume_lwp (struct lwp_info *lp, int step, enum gdb_signal signo) |
d6b0e80f | 1636 | { |
25289eb2 | 1637 | if (lp->stopped) |
6c95b8df | 1638 | { |
c9657e70 | 1639 | struct inferior *inf = find_inferior_ptid (lp->ptid); |
25289eb2 PA |
1640 | |
1641 | if (inf->vfork_child != NULL) | |
1642 | { | |
1643 | if (debug_linux_nat) | |
1644 | fprintf_unfiltered (gdb_stdlog, | |
1645 | "RC: Not resuming %s (vfork parent)\n", | |
1646 | target_pid_to_str (lp->ptid)); | |
1647 | } | |
8a99810d | 1648 | else if (!lwp_status_pending_p (lp)) |
25289eb2 PA |
1649 | { |
1650 | if (debug_linux_nat) | |
1651 | fprintf_unfiltered (gdb_stdlog, | |
e5ef252a PA |
1652 | "RC: Resuming sibling %s, %s, %s\n", |
1653 | target_pid_to_str (lp->ptid), | |
1654 | (signo != GDB_SIGNAL_0 | |
1655 | ? strsignal (gdb_signal_to_host (signo)) | |
1656 | : "0"), | |
1657 | step ? "step" : "resume"); | |
25289eb2 | 1658 | |
8a99810d | 1659 | linux_resume_one_lwp (lp, step, signo); |
25289eb2 PA |
1660 | } |
1661 | else | |
1662 | { | |
1663 | if (debug_linux_nat) | |
1664 | fprintf_unfiltered (gdb_stdlog, | |
1665 | "RC: Not resuming sibling %s (has pending)\n", | |
1666 | target_pid_to_str (lp->ptid)); | |
1667 | } | |
6c95b8df | 1668 | } |
25289eb2 | 1669 | else |
d6b0e80f | 1670 | { |
d90e17a7 PA |
1671 | if (debug_linux_nat) |
1672 | fprintf_unfiltered (gdb_stdlog, | |
25289eb2 | 1673 | "RC: Not resuming sibling %s (not stopped)\n", |
d6b0e80f | 1674 | target_pid_to_str (lp->ptid)); |
d6b0e80f | 1675 | } |
25289eb2 | 1676 | } |
d6b0e80f | 1677 | |
8817a6f2 PA |
1678 | /* Callback for iterate_over_lwps. If LWP is EXCEPT, do nothing. |
1679 | Resume LWP with the last stop signal, if it is in pass state. */ | |
e5ef252a | 1680 | |
25289eb2 | 1681 | static int |
8817a6f2 | 1682 | linux_nat_resume_callback (struct lwp_info *lp, void *except) |
25289eb2 | 1683 | { |
e5ef252a PA |
1684 | enum gdb_signal signo = GDB_SIGNAL_0; |
1685 | ||
8817a6f2 PA |
1686 | if (lp == except) |
1687 | return 0; | |
1688 | ||
e5ef252a PA |
1689 | if (lp->stopped) |
1690 | { | |
1691 | struct thread_info *thread; | |
1692 | ||
1693 | thread = find_thread_ptid (lp->ptid); | |
1694 | if (thread != NULL) | |
1695 | { | |
70509625 | 1696 | signo = thread->suspend.stop_signal; |
e5ef252a PA |
1697 | thread->suspend.stop_signal = GDB_SIGNAL_0; |
1698 | } | |
1699 | } | |
1700 | ||
1701 | resume_lwp (lp, 0, signo); | |
d6b0e80f AC |
1702 | return 0; |
1703 | } | |
1704 | ||
1705 | static int | |
1706 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1707 | { | |
1708 | lp->resumed = 0; | |
25289eb2 | 1709 | lp->last_resume_kind = resume_stop; |
d6b0e80f AC |
1710 | return 0; |
1711 | } | |
1712 | ||
1713 | static int | |
1714 | resume_set_callback (struct lwp_info *lp, void *data) | |
1715 | { | |
1716 | lp->resumed = 1; | |
25289eb2 | 1717 | lp->last_resume_kind = resume_continue; |
d6b0e80f AC |
1718 | return 0; |
1719 | } | |
1720 | ||
1721 | static void | |
28439f5e | 1722 | linux_nat_resume (struct target_ops *ops, |
2ea28649 | 1723 | ptid_t ptid, int step, enum gdb_signal signo) |
d6b0e80f AC |
1724 | { |
1725 | struct lwp_info *lp; | |
d90e17a7 | 1726 | int resume_many; |
d6b0e80f | 1727 | |
76f50ad1 DJ |
1728 | if (debug_linux_nat) |
1729 | fprintf_unfiltered (gdb_stdlog, | |
1730 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1731 | step ? "step" : "resume", | |
1732 | target_pid_to_str (ptid), | |
a493e3e2 | 1733 | (signo != GDB_SIGNAL_0 |
2ea28649 | 1734 | ? strsignal (gdb_signal_to_host (signo)) : "0"), |
76f50ad1 DJ |
1735 | target_pid_to_str (inferior_ptid)); |
1736 | ||
d6b0e80f | 1737 | /* A specific PTID means `step only this process id'. */ |
d90e17a7 PA |
1738 | resume_many = (ptid_equal (minus_one_ptid, ptid) |
1739 | || ptid_is_pid (ptid)); | |
4c28f408 | 1740 | |
e3e9f5a2 PA |
1741 | /* Mark the lwps we're resuming as resumed. */ |
1742 | iterate_over_lwps (ptid, resume_set_callback, NULL); | |
d6b0e80f | 1743 | |
d90e17a7 PA |
1744 | /* See if it's the current inferior that should be handled |
1745 | specially. */ | |
1746 | if (resume_many) | |
1747 | lp = find_lwp_pid (inferior_ptid); | |
1748 | else | |
1749 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1750 | gdb_assert (lp != NULL); |
d6b0e80f | 1751 | |
9f0bdab8 | 1752 | /* Remember if we're stepping. */ |
25289eb2 | 1753 | lp->last_resume_kind = step ? resume_step : resume_continue; |
d6b0e80f | 1754 | |
9f0bdab8 DJ |
1755 | /* If we have a pending wait status for this thread, there is no |
1756 | point in resuming the process. But first make sure that | |
1757 | linux_nat_wait won't preemptively handle the event - we | |
1758 | should never take this short-circuit if we are going to | |
1759 | leave LP running, since we have skipped resuming all the | |
1760 | other threads. This bit of code needs to be synchronized | |
1761 | with linux_nat_wait. */ | |
76f50ad1 | 1762 | |
9f0bdab8 DJ |
1763 | if (lp->status && WIFSTOPPED (lp->status)) |
1764 | { | |
2455069d UW |
1765 | if (!lp->step |
1766 | && WSTOPSIG (lp->status) | |
1767 | && sigismember (&pass_mask, WSTOPSIG (lp->status))) | |
d6b0e80f | 1768 | { |
9f0bdab8 DJ |
1769 | if (debug_linux_nat) |
1770 | fprintf_unfiltered (gdb_stdlog, | |
1771 | "LLR: Not short circuiting for ignored " | |
1772 | "status 0x%x\n", lp->status); | |
1773 | ||
d6b0e80f AC |
1774 | /* FIXME: What should we do if we are supposed to continue |
1775 | this thread with a signal? */ | |
a493e3e2 | 1776 | gdb_assert (signo == GDB_SIGNAL_0); |
2ea28649 | 1777 | signo = gdb_signal_from_host (WSTOPSIG (lp->status)); |
9f0bdab8 DJ |
1778 | lp->status = 0; |
1779 | } | |
1780 | } | |
76f50ad1 | 1781 | |
8a99810d | 1782 | if (lwp_status_pending_p (lp)) |
9f0bdab8 DJ |
1783 | { |
1784 | /* FIXME: What should we do if we are supposed to continue | |
1785 | this thread with a signal? */ | |
a493e3e2 | 1786 | gdb_assert (signo == GDB_SIGNAL_0); |
76f50ad1 | 1787 | |
9f0bdab8 DJ |
1788 | if (debug_linux_nat) |
1789 | fprintf_unfiltered (gdb_stdlog, | |
1790 | "LLR: Short circuiting for status 0x%x\n", | |
1791 | lp->status); | |
d6b0e80f | 1792 | |
7feb7d06 PA |
1793 | if (target_can_async_p ()) |
1794 | { | |
6a3753b3 | 1795 | target_async (1); |
7feb7d06 PA |
1796 | /* Tell the event loop we have something to process. */ |
1797 | async_file_mark (); | |
1798 | } | |
9f0bdab8 | 1799 | return; |
d6b0e80f AC |
1800 | } |
1801 | ||
d90e17a7 | 1802 | if (resume_many) |
8817a6f2 | 1803 | iterate_over_lwps (ptid, linux_nat_resume_callback, lp); |
d90e17a7 | 1804 | |
d6b0e80f AC |
1805 | if (debug_linux_nat) |
1806 | fprintf_unfiltered (gdb_stdlog, | |
1807 | "LLR: %s %s, %s (resume event thread)\n", | |
1808 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2bf6fb9d | 1809 | target_pid_to_str (lp->ptid), |
a493e3e2 | 1810 | (signo != GDB_SIGNAL_0 |
2ea28649 | 1811 | ? strsignal (gdb_signal_to_host (signo)) : "0")); |
b84876c2 | 1812 | |
2bf6fb9d PA |
1813 | linux_resume_one_lwp (lp, step, signo); |
1814 | ||
b84876c2 | 1815 | if (target_can_async_p ()) |
6a3753b3 | 1816 | target_async (1); |
d6b0e80f AC |
1817 | } |
1818 | ||
c5f62d5f | 1819 | /* Send a signal to an LWP. */ |
d6b0e80f AC |
1820 | |
1821 | static int | |
1822 | kill_lwp (int lwpid, int signo) | |
1823 | { | |
4a6ed09b | 1824 | int ret; |
d6b0e80f | 1825 | |
4a6ed09b PA |
1826 | errno = 0; |
1827 | ret = syscall (__NR_tkill, lwpid, signo); | |
1828 | if (errno == ENOSYS) | |
1829 | { | |
1830 | /* If tkill fails, then we are not using nptl threads, a | |
1831 | configuration we no longer support. */ | |
1832 | perror_with_name (("tkill")); | |
1833 | } | |
1834 | return ret; | |
d6b0e80f AC |
1835 | } |
1836 | ||
ca2163eb PA |
1837 | /* Handle a GNU/Linux syscall trap wait response. If we see a syscall |
1838 | event, check if the core is interested in it: if not, ignore the | |
1839 | event, and keep waiting; otherwise, we need to toggle the LWP's | |
1840 | syscall entry/exit status, since the ptrace event itself doesn't | |
1841 | indicate it, and report the trap to higher layers. */ | |
1842 | ||
1843 | static int | |
1844 | linux_handle_syscall_trap (struct lwp_info *lp, int stopping) | |
1845 | { | |
1846 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
1847 | struct gdbarch *gdbarch = target_thread_architecture (lp->ptid); | |
1848 | int syscall_number = (int) gdbarch_get_syscall_number (gdbarch, lp->ptid); | |
1849 | ||
1850 | if (stopping) | |
1851 | { | |
1852 | /* If we're stopping threads, there's a SIGSTOP pending, which | |
1853 | makes it so that the LWP reports an immediate syscall return, | |
1854 | followed by the SIGSTOP. Skip seeing that "return" using | |
1855 | PTRACE_CONT directly, and let stop_wait_callback collect the | |
1856 | SIGSTOP. Later when the thread is resumed, a new syscall | |
1857 | entry event. If we didn't do this (and returned 0), we'd | |
1858 | leave a syscall entry pending, and our caller, by using | |
1859 | PTRACE_CONT to collect the SIGSTOP, skips the syscall return | |
1860 | itself. Later, when the user re-resumes this LWP, we'd see | |
1861 | another syscall entry event and we'd mistake it for a return. | |
1862 | ||
1863 | If stop_wait_callback didn't force the SIGSTOP out of the LWP | |
1864 | (leaving immediately with LWP->signalled set, without issuing | |
1865 | a PTRACE_CONT), it would still be problematic to leave this | |
1866 | syscall enter pending, as later when the thread is resumed, | |
1867 | it would then see the same syscall exit mentioned above, | |
1868 | followed by the delayed SIGSTOP, while the syscall didn't | |
1869 | actually get to execute. It seems it would be even more | |
1870 | confusing to the user. */ | |
1871 | ||
1872 | if (debug_linux_nat) | |
1873 | fprintf_unfiltered (gdb_stdlog, | |
1874 | "LHST: ignoring syscall %d " | |
1875 | "for LWP %ld (stopping threads), " | |
1876 | "resuming with PTRACE_CONT for SIGSTOP\n", | |
1877 | syscall_number, | |
dfd4cc63 | 1878 | ptid_get_lwp (lp->ptid)); |
ca2163eb PA |
1879 | |
1880 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
dfd4cc63 | 1881 | ptrace (PTRACE_CONT, ptid_get_lwp (lp->ptid), 0, 0); |
8817a6f2 | 1882 | lp->stopped = 0; |
ca2163eb PA |
1883 | return 1; |
1884 | } | |
1885 | ||
bfd09d20 JS |
1886 | /* Always update the entry/return state, even if this particular |
1887 | syscall isn't interesting to the core now. In async mode, | |
1888 | the user could install a new catchpoint for this syscall | |
1889 | between syscall enter/return, and we'll need to know to | |
1890 | report a syscall return if that happens. */ | |
1891 | lp->syscall_state = (lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
1892 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
1893 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
1894 | ||
ca2163eb PA |
1895 | if (catch_syscall_enabled ()) |
1896 | { | |
ca2163eb PA |
1897 | if (catching_syscall_number (syscall_number)) |
1898 | { | |
1899 | /* Alright, an event to report. */ | |
1900 | ourstatus->kind = lp->syscall_state; | |
1901 | ourstatus->value.syscall_number = syscall_number; | |
1902 | ||
1903 | if (debug_linux_nat) | |
1904 | fprintf_unfiltered (gdb_stdlog, | |
1905 | "LHST: stopping for %s of syscall %d" | |
1906 | " for LWP %ld\n", | |
3e43a32a MS |
1907 | lp->syscall_state |
1908 | == TARGET_WAITKIND_SYSCALL_ENTRY | |
ca2163eb PA |
1909 | ? "entry" : "return", |
1910 | syscall_number, | |
dfd4cc63 | 1911 | ptid_get_lwp (lp->ptid)); |
ca2163eb PA |
1912 | return 0; |
1913 | } | |
1914 | ||
1915 | if (debug_linux_nat) | |
1916 | fprintf_unfiltered (gdb_stdlog, | |
1917 | "LHST: ignoring %s of syscall %d " | |
1918 | "for LWP %ld\n", | |
1919 | lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
1920 | ? "entry" : "return", | |
1921 | syscall_number, | |
dfd4cc63 | 1922 | ptid_get_lwp (lp->ptid)); |
ca2163eb PA |
1923 | } |
1924 | else | |
1925 | { | |
1926 | /* If we had been syscall tracing, and hence used PT_SYSCALL | |
1927 | before on this LWP, it could happen that the user removes all | |
1928 | syscall catchpoints before we get to process this event. | |
1929 | There are two noteworthy issues here: | |
1930 | ||
1931 | - When stopped at a syscall entry event, resuming with | |
1932 | PT_STEP still resumes executing the syscall and reports a | |
1933 | syscall return. | |
1934 | ||
1935 | - Only PT_SYSCALL catches syscall enters. If we last | |
1936 | single-stepped this thread, then this event can't be a | |
1937 | syscall enter. If we last single-stepped this thread, this | |
1938 | has to be a syscall exit. | |
1939 | ||
1940 | The points above mean that the next resume, be it PT_STEP or | |
1941 | PT_CONTINUE, can not trigger a syscall trace event. */ | |
1942 | if (debug_linux_nat) | |
1943 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
1944 | "LHST: caught syscall event " |
1945 | "with no syscall catchpoints." | |
ca2163eb PA |
1946 | " %d for LWP %ld, ignoring\n", |
1947 | syscall_number, | |
dfd4cc63 | 1948 | ptid_get_lwp (lp->ptid)); |
ca2163eb PA |
1949 | lp->syscall_state = TARGET_WAITKIND_IGNORE; |
1950 | } | |
1951 | ||
1952 | /* The core isn't interested in this event. For efficiency, avoid | |
1953 | stopping all threads only to have the core resume them all again. | |
1954 | Since we're not stopping threads, if we're still syscall tracing | |
1955 | and not stepping, we can't use PTRACE_CONT here, as we'd miss any | |
1956 | subsequent syscall. Simply resume using the inf-ptrace layer, | |
1957 | which knows when to use PT_SYSCALL or PT_CONTINUE. */ | |
1958 | ||
8a99810d | 1959 | linux_resume_one_lwp (lp, lp->step, GDB_SIGNAL_0); |
ca2163eb PA |
1960 | return 1; |
1961 | } | |
1962 | ||
3d799a95 DJ |
1963 | /* Handle a GNU/Linux extended wait response. If we see a clone |
1964 | event, we need to add the new LWP to our list (and not report the | |
1965 | trap to higher layers). This function returns non-zero if the | |
1966 | event should be ignored and we should wait again. If STOPPING is | |
1967 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
1968 | |
1969 | static int | |
4dd63d48 | 1970 | linux_handle_extended_wait (struct lwp_info *lp, int status) |
d6b0e80f | 1971 | { |
dfd4cc63 | 1972 | int pid = ptid_get_lwp (lp->ptid); |
3d799a95 | 1973 | struct target_waitstatus *ourstatus = &lp->waitstatus; |
89a5711c | 1974 | int event = linux_ptrace_get_extended_event (status); |
d6b0e80f | 1975 | |
bfd09d20 JS |
1976 | /* All extended events we currently use are mid-syscall. Only |
1977 | PTRACE_EVENT_STOP is delivered more like a signal-stop, but | |
1978 | you have to be using PTRACE_SEIZE to get that. */ | |
1979 | lp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
1980 | ||
3d799a95 DJ |
1981 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
1982 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 1983 | { |
3d799a95 DJ |
1984 | unsigned long new_pid; |
1985 | int ret; | |
1986 | ||
1987 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 1988 | |
3d799a95 DJ |
1989 | /* If we haven't already seen the new PID stop, wait for it now. */ |
1990 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
1991 | { | |
1992 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
1993 | hits the SIGSTOP, but we're already attached. */ | |
4a6ed09b | 1994 | ret = my_waitpid (new_pid, &status, __WALL); |
3d799a95 DJ |
1995 | if (ret == -1) |
1996 | perror_with_name (_("waiting for new child")); | |
1997 | else if (ret != new_pid) | |
1998 | internal_error (__FILE__, __LINE__, | |
1999 | _("wait returned unexpected PID %d"), ret); | |
2000 | else if (!WIFSTOPPED (status)) | |
2001 | internal_error (__FILE__, __LINE__, | |
2002 | _("wait returned unexpected status 0x%x"), status); | |
2003 | } | |
2004 | ||
3a3e9ee3 | 2005 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 | 2006 | |
26cb8b7c PA |
2007 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
2008 | { | |
2009 | /* The arch-specific native code may need to know about new | |
2010 | forks even if those end up never mapped to an | |
2011 | inferior. */ | |
2012 | if (linux_nat_new_fork != NULL) | |
2013 | linux_nat_new_fork (lp, new_pid); | |
2014 | } | |
2015 | ||
2277426b | 2016 | if (event == PTRACE_EVENT_FORK |
dfd4cc63 | 2017 | && linux_fork_checkpointing_p (ptid_get_pid (lp->ptid))) |
2277426b | 2018 | { |
2277426b PA |
2019 | /* Handle checkpointing by linux-fork.c here as a special |
2020 | case. We don't want the follow-fork-mode or 'catch fork' | |
2021 | to interfere with this. */ | |
2022 | ||
2023 | /* This won't actually modify the breakpoint list, but will | |
2024 | physically remove the breakpoints from the child. */ | |
d80ee84f | 2025 | detach_breakpoints (ptid_build (new_pid, new_pid, 0)); |
2277426b PA |
2026 | |
2027 | /* Retain child fork in ptrace (stopped) state. */ | |
14571dad MS |
2028 | if (!find_fork_pid (new_pid)) |
2029 | add_fork (new_pid); | |
2277426b PA |
2030 | |
2031 | /* Report as spurious, so that infrun doesn't want to follow | |
2032 | this fork. We're actually doing an infcall in | |
2033 | linux-fork.c. */ | |
2034 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
2277426b PA |
2035 | |
2036 | /* Report the stop to the core. */ | |
2037 | return 0; | |
2038 | } | |
2039 | ||
3d799a95 DJ |
2040 | if (event == PTRACE_EVENT_FORK) |
2041 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
2042 | else if (event == PTRACE_EVENT_VFORK) | |
2043 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
4dd63d48 | 2044 | else if (event == PTRACE_EVENT_CLONE) |
3d799a95 | 2045 | { |
78768c4a JK |
2046 | struct lwp_info *new_lp; |
2047 | ||
3d799a95 | 2048 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
78768c4a | 2049 | |
3c4d7e12 PA |
2050 | if (debug_linux_nat) |
2051 | fprintf_unfiltered (gdb_stdlog, | |
2052 | "LHEW: Got clone event " | |
2053 | "from LWP %d, new child is LWP %ld\n", | |
2054 | pid, new_pid); | |
2055 | ||
dfd4cc63 | 2056 | new_lp = add_lwp (ptid_build (ptid_get_pid (lp->ptid), new_pid, 0)); |
4c28f408 | 2057 | new_lp->stopped = 1; |
4dd63d48 | 2058 | new_lp->resumed = 1; |
d6b0e80f | 2059 | |
2db9a427 PA |
2060 | /* If the thread_db layer is active, let it record the user |
2061 | level thread id and status, and add the thread to GDB's | |
2062 | list. */ | |
2063 | if (!thread_db_notice_clone (lp->ptid, new_lp->ptid)) | |
3d799a95 | 2064 | { |
2db9a427 PA |
2065 | /* The process is not using thread_db. Add the LWP to |
2066 | GDB's list. */ | |
2067 | target_post_attach (ptid_get_lwp (new_lp->ptid)); | |
2068 | add_thread (new_lp->ptid); | |
2069 | } | |
4c28f408 | 2070 | |
2ee52aa4 | 2071 | /* Even if we're stopping the thread for some reason |
4dd63d48 PA |
2072 | internal to this module, from the perspective of infrun |
2073 | and the user/frontend, this new thread is running until | |
2074 | it next reports a stop. */ | |
2ee52aa4 | 2075 | set_running (new_lp->ptid, 1); |
4dd63d48 | 2076 | set_executing (new_lp->ptid, 1); |
4c28f408 | 2077 | |
4dd63d48 | 2078 | if (WSTOPSIG (status) != SIGSTOP) |
79395f92 | 2079 | { |
4dd63d48 PA |
2080 | /* This can happen if someone starts sending signals to |
2081 | the new thread before it gets a chance to run, which | |
2082 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
2083 | This is an unlikely case, and harder to handle for | |
2084 | fork / vfork than for clone, so we do not try - but | |
2085 | we handle it for clone events here. */ | |
2086 | ||
2087 | new_lp->signalled = 1; | |
2088 | ||
79395f92 PA |
2089 | /* We created NEW_LP so it cannot yet contain STATUS. */ |
2090 | gdb_assert (new_lp->status == 0); | |
2091 | ||
2092 | /* Save the wait status to report later. */ | |
2093 | if (debug_linux_nat) | |
2094 | fprintf_unfiltered (gdb_stdlog, | |
2095 | "LHEW: waitpid of new LWP %ld, " | |
2096 | "saving status %s\n", | |
dfd4cc63 | 2097 | (long) ptid_get_lwp (new_lp->ptid), |
79395f92 PA |
2098 | status_to_str (status)); |
2099 | new_lp->status = status; | |
2100 | } | |
aa01bd36 PA |
2101 | else if (report_thread_events) |
2102 | { | |
2103 | new_lp->waitstatus.kind = TARGET_WAITKIND_THREAD_CREATED; | |
2104 | new_lp->status = status; | |
2105 | } | |
79395f92 | 2106 | |
3d799a95 DJ |
2107 | return 1; |
2108 | } | |
2109 | ||
2110 | return 0; | |
d6b0e80f AC |
2111 | } |
2112 | ||
3d799a95 DJ |
2113 | if (event == PTRACE_EVENT_EXEC) |
2114 | { | |
a75724bc PA |
2115 | if (debug_linux_nat) |
2116 | fprintf_unfiltered (gdb_stdlog, | |
2117 | "LHEW: Got exec event from LWP %ld\n", | |
dfd4cc63 | 2118 | ptid_get_lwp (lp->ptid)); |
a75724bc | 2119 | |
3d799a95 DJ |
2120 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
2121 | ourstatus->value.execd_pathname | |
8dd27370 | 2122 | = xstrdup (linux_child_pid_to_exec_file (NULL, pid)); |
3d799a95 | 2123 | |
8af756ef PA |
2124 | /* The thread that execed must have been resumed, but, when a |
2125 | thread execs, it changes its tid to the tgid, and the old | |
2126 | tgid thread might have not been resumed. */ | |
2127 | lp->resumed = 1; | |
6c95b8df PA |
2128 | return 0; |
2129 | } | |
2130 | ||
2131 | if (event == PTRACE_EVENT_VFORK_DONE) | |
2132 | { | |
2133 | if (current_inferior ()->waiting_for_vfork_done) | |
3d799a95 | 2134 | { |
6c95b8df | 2135 | if (debug_linux_nat) |
3e43a32a MS |
2136 | fprintf_unfiltered (gdb_stdlog, |
2137 | "LHEW: Got expected PTRACE_EVENT_" | |
2138 | "VFORK_DONE from LWP %ld: stopping\n", | |
dfd4cc63 | 2139 | ptid_get_lwp (lp->ptid)); |
3d799a95 | 2140 | |
6c95b8df PA |
2141 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; |
2142 | return 0; | |
3d799a95 DJ |
2143 | } |
2144 | ||
6c95b8df | 2145 | if (debug_linux_nat) |
3e43a32a MS |
2146 | fprintf_unfiltered (gdb_stdlog, |
2147 | "LHEW: Got PTRACE_EVENT_VFORK_DONE " | |
20ba1ce6 | 2148 | "from LWP %ld: ignoring\n", |
dfd4cc63 | 2149 | ptid_get_lwp (lp->ptid)); |
6c95b8df | 2150 | return 1; |
3d799a95 DJ |
2151 | } |
2152 | ||
2153 | internal_error (__FILE__, __LINE__, | |
2154 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
2155 | } |
2156 | ||
2157 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has | |
2158 | exited. */ | |
2159 | ||
2160 | static int | |
2161 | wait_lwp (struct lwp_info *lp) | |
2162 | { | |
2163 | pid_t pid; | |
432b4d03 | 2164 | int status = 0; |
d6b0e80f | 2165 | int thread_dead = 0; |
432b4d03 | 2166 | sigset_t prev_mask; |
d6b0e80f AC |
2167 | |
2168 | gdb_assert (!lp->stopped); | |
2169 | gdb_assert (lp->status == 0); | |
2170 | ||
432b4d03 JK |
2171 | /* Make sure SIGCHLD is blocked for sigsuspend avoiding a race below. */ |
2172 | block_child_signals (&prev_mask); | |
2173 | ||
2174 | for (;;) | |
d6b0e80f | 2175 | { |
4a6ed09b | 2176 | pid = my_waitpid (ptid_get_lwp (lp->ptid), &status, __WALL | WNOHANG); |
a9f4bb21 PA |
2177 | if (pid == -1 && errno == ECHILD) |
2178 | { | |
2179 | /* The thread has previously exited. We need to delete it | |
4a6ed09b PA |
2180 | now because if this was a non-leader thread execing, we |
2181 | won't get an exit event. See comments on exec events at | |
2182 | the top of the file. */ | |
a9f4bb21 PA |
2183 | thread_dead = 1; |
2184 | if (debug_linux_nat) | |
2185 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
2186 | target_pid_to_str (lp->ptid)); | |
2187 | } | |
432b4d03 JK |
2188 | if (pid != 0) |
2189 | break; | |
2190 | ||
2191 | /* Bugs 10970, 12702. | |
2192 | Thread group leader may have exited in which case we'll lock up in | |
2193 | waitpid if there are other threads, even if they are all zombies too. | |
2194 | Basically, we're not supposed to use waitpid this way. | |
4a6ed09b PA |
2195 | tkill(pid,0) cannot be used here as it gets ESRCH for both |
2196 | for zombie and running processes. | |
432b4d03 JK |
2197 | |
2198 | As a workaround, check if we're waiting for the thread group leader and | |
2199 | if it's a zombie, and avoid calling waitpid if it is. | |
2200 | ||
2201 | This is racy, what if the tgl becomes a zombie right after we check? | |
2202 | Therefore always use WNOHANG with sigsuspend - it is equivalent to | |
5f572dec | 2203 | waiting waitpid but linux_proc_pid_is_zombie is safe this way. */ |
432b4d03 | 2204 | |
dfd4cc63 LM |
2205 | if (ptid_get_pid (lp->ptid) == ptid_get_lwp (lp->ptid) |
2206 | && linux_proc_pid_is_zombie (ptid_get_lwp (lp->ptid))) | |
d6b0e80f | 2207 | { |
d6b0e80f AC |
2208 | thread_dead = 1; |
2209 | if (debug_linux_nat) | |
432b4d03 JK |
2210 | fprintf_unfiltered (gdb_stdlog, |
2211 | "WL: Thread group leader %s vanished.\n", | |
d6b0e80f | 2212 | target_pid_to_str (lp->ptid)); |
432b4d03 | 2213 | break; |
d6b0e80f | 2214 | } |
432b4d03 JK |
2215 | |
2216 | /* Wait for next SIGCHLD and try again. This may let SIGCHLD handlers | |
2217 | get invoked despite our caller had them intentionally blocked by | |
2218 | block_child_signals. This is sensitive only to the loop of | |
2219 | linux_nat_wait_1 and there if we get called my_waitpid gets called | |
2220 | again before it gets to sigsuspend so we can safely let the handlers | |
2221 | get executed here. */ | |
2222 | ||
d36bf488 DE |
2223 | if (debug_linux_nat) |
2224 | fprintf_unfiltered (gdb_stdlog, "WL: about to sigsuspend\n"); | |
432b4d03 JK |
2225 | sigsuspend (&suspend_mask); |
2226 | } | |
2227 | ||
2228 | restore_child_signals_mask (&prev_mask); | |
2229 | ||
d6b0e80f AC |
2230 | if (!thread_dead) |
2231 | { | |
dfd4cc63 | 2232 | gdb_assert (pid == ptid_get_lwp (lp->ptid)); |
d6b0e80f AC |
2233 | |
2234 | if (debug_linux_nat) | |
2235 | { | |
2236 | fprintf_unfiltered (gdb_stdlog, | |
2237 | "WL: waitpid %s received %s\n", | |
2238 | target_pid_to_str (lp->ptid), | |
2239 | status_to_str (status)); | |
2240 | } | |
d6b0e80f | 2241 | |
a9f4bb21 PA |
2242 | /* Check if the thread has exited. */ |
2243 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
2244 | { | |
aa01bd36 PA |
2245 | if (report_thread_events |
2246 | || ptid_get_pid (lp->ptid) == ptid_get_lwp (lp->ptid)) | |
69dde7dc PA |
2247 | { |
2248 | if (debug_linux_nat) | |
aa01bd36 | 2249 | fprintf_unfiltered (gdb_stdlog, "WL: LWP %d exited.\n", |
69dde7dc PA |
2250 | ptid_get_pid (lp->ptid)); |
2251 | ||
aa01bd36 | 2252 | /* If this is the leader exiting, it means the whole |
69dde7dc PA |
2253 | process is gone. Store the status to report to the |
2254 | core. Store it in lp->waitstatus, because lp->status | |
2255 | would be ambiguous (W_EXITCODE(0,0) == 0). */ | |
2256 | store_waitstatus (&lp->waitstatus, status); | |
2257 | return 0; | |
2258 | } | |
2259 | ||
a9f4bb21 PA |
2260 | thread_dead = 1; |
2261 | if (debug_linux_nat) | |
2262 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
2263 | target_pid_to_str (lp->ptid)); | |
2264 | } | |
d6b0e80f AC |
2265 | } |
2266 | ||
2267 | if (thread_dead) | |
2268 | { | |
e26af52f | 2269 | exit_lwp (lp); |
d6b0e80f AC |
2270 | return 0; |
2271 | } | |
2272 | ||
2273 | gdb_assert (WIFSTOPPED (status)); | |
8817a6f2 | 2274 | lp->stopped = 1; |
d6b0e80f | 2275 | |
8784d563 PA |
2276 | if (lp->must_set_ptrace_flags) |
2277 | { | |
2278 | struct inferior *inf = find_inferior_pid (ptid_get_pid (lp->ptid)); | |
de0d863e | 2279 | int options = linux_nat_ptrace_options (inf->attach_flag); |
8784d563 | 2280 | |
de0d863e | 2281 | linux_enable_event_reporting (ptid_get_lwp (lp->ptid), options); |
8784d563 PA |
2282 | lp->must_set_ptrace_flags = 0; |
2283 | } | |
2284 | ||
ca2163eb PA |
2285 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
2286 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
2287 | { | |
2288 | /* No longer need the sysgood bit. The ptrace event ends up | |
2289 | recorded in lp->waitstatus if we care for it. We can carry | |
2290 | on handling the event like a regular SIGTRAP from here | |
2291 | on. */ | |
2292 | status = W_STOPCODE (SIGTRAP); | |
2293 | if (linux_handle_syscall_trap (lp, 1)) | |
2294 | return wait_lwp (lp); | |
2295 | } | |
bfd09d20 JS |
2296 | else |
2297 | { | |
2298 | /* Almost all other ptrace-stops are known to be outside of system | |
2299 | calls, with further exceptions in linux_handle_extended_wait. */ | |
2300 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2301 | } | |
ca2163eb | 2302 | |
d6b0e80f | 2303 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
89a5711c DB |
2304 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP |
2305 | && linux_is_extended_waitstatus (status)) | |
d6b0e80f AC |
2306 | { |
2307 | if (debug_linux_nat) | |
2308 | fprintf_unfiltered (gdb_stdlog, | |
2309 | "WL: Handling extended status 0x%06x\n", | |
2310 | status); | |
4dd63d48 | 2311 | linux_handle_extended_wait (lp, status); |
20ba1ce6 | 2312 | return 0; |
d6b0e80f AC |
2313 | } |
2314 | ||
2315 | return status; | |
2316 | } | |
2317 | ||
2318 | /* Send a SIGSTOP to LP. */ | |
2319 | ||
2320 | static int | |
2321 | stop_callback (struct lwp_info *lp, void *data) | |
2322 | { | |
2323 | if (!lp->stopped && !lp->signalled) | |
2324 | { | |
2325 | int ret; | |
2326 | ||
2327 | if (debug_linux_nat) | |
2328 | { | |
2329 | fprintf_unfiltered (gdb_stdlog, | |
2330 | "SC: kill %s **<SIGSTOP>**\n", | |
2331 | target_pid_to_str (lp->ptid)); | |
2332 | } | |
2333 | errno = 0; | |
dfd4cc63 | 2334 | ret = kill_lwp (ptid_get_lwp (lp->ptid), SIGSTOP); |
d6b0e80f AC |
2335 | if (debug_linux_nat) |
2336 | { | |
2337 | fprintf_unfiltered (gdb_stdlog, | |
2338 | "SC: lwp kill %d %s\n", | |
2339 | ret, | |
2340 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
2341 | } | |
2342 | ||
2343 | lp->signalled = 1; | |
2344 | gdb_assert (lp->status == 0); | |
2345 | } | |
2346 | ||
2347 | return 0; | |
2348 | } | |
2349 | ||
7b50312a PA |
2350 | /* Request a stop on LWP. */ |
2351 | ||
2352 | void | |
2353 | linux_stop_lwp (struct lwp_info *lwp) | |
2354 | { | |
2355 | stop_callback (lwp, NULL); | |
2356 | } | |
2357 | ||
2db9a427 PA |
2358 | /* See linux-nat.h */ |
2359 | ||
2360 | void | |
2361 | linux_stop_and_wait_all_lwps (void) | |
2362 | { | |
2363 | /* Stop all LWP's ... */ | |
2364 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); | |
2365 | ||
2366 | /* ... and wait until all of them have reported back that | |
2367 | they're no longer running. */ | |
2368 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); | |
2369 | } | |
2370 | ||
2371 | /* See linux-nat.h */ | |
2372 | ||
2373 | void | |
2374 | linux_unstop_all_lwps (void) | |
2375 | { | |
2376 | iterate_over_lwps (minus_one_ptid, | |
2377 | resume_stopped_resumed_lwps, &minus_one_ptid); | |
2378 | } | |
2379 | ||
57380f4e | 2380 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
2381 | |
2382 | static int | |
57380f4e DJ |
2383 | linux_nat_has_pending_sigint (int pid) |
2384 | { | |
2385 | sigset_t pending, blocked, ignored; | |
57380f4e DJ |
2386 | |
2387 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
2388 | ||
2389 | if (sigismember (&pending, SIGINT) | |
2390 | && !sigismember (&ignored, SIGINT)) | |
2391 | return 1; | |
2392 | ||
2393 | return 0; | |
2394 | } | |
2395 | ||
2396 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
2397 | ||
2398 | static int | |
2399 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2400 | { |
57380f4e DJ |
2401 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2402 | flag to consume the next one. */ | |
2403 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2404 | && WSTOPSIG (lp->status) == SIGINT) | |
2405 | lp->status = 0; | |
2406 | else | |
2407 | lp->ignore_sigint = 1; | |
2408 | ||
2409 | return 0; | |
2410 | } | |
2411 | ||
2412 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2413 | This function is called after we know the LWP has stopped; if the LWP | |
2414 | stopped before the expected SIGINT was delivered, then it will never have | |
2415 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2416 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2417 | |
57380f4e DJ |
2418 | static void |
2419 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2420 | { | |
2421 | if (!lp->ignore_sigint) | |
2422 | return; | |
2423 | ||
dfd4cc63 | 2424 | if (!linux_nat_has_pending_sigint (ptid_get_lwp (lp->ptid))) |
57380f4e DJ |
2425 | { |
2426 | if (debug_linux_nat) | |
2427 | fprintf_unfiltered (gdb_stdlog, | |
2428 | "MCIS: Clearing bogus flag for %s\n", | |
2429 | target_pid_to_str (lp->ptid)); | |
2430 | lp->ignore_sigint = 0; | |
2431 | } | |
2432 | } | |
2433 | ||
ebec9a0f PA |
2434 | /* Fetch the possible triggered data watchpoint info and store it in |
2435 | LP. | |
2436 | ||
2437 | On some archs, like x86, that use debug registers to set | |
2438 | watchpoints, it's possible that the way to know which watched | |
2439 | address trapped, is to check the register that is used to select | |
2440 | which address to watch. Problem is, between setting the watchpoint | |
2441 | and reading back which data address trapped, the user may change | |
2442 | the set of watchpoints, and, as a consequence, GDB changes the | |
2443 | debug registers in the inferior. To avoid reading back a stale | |
2444 | stopped-data-address when that happens, we cache in LP the fact | |
2445 | that a watchpoint trapped, and the corresponding data address, as | |
2446 | soon as we see LP stop with a SIGTRAP. If GDB changes the debug | |
2447 | registers meanwhile, we have the cached data we can rely on. */ | |
2448 | ||
9c02b525 PA |
2449 | static int |
2450 | check_stopped_by_watchpoint (struct lwp_info *lp) | |
ebec9a0f | 2451 | { |
ebec9a0f | 2452 | if (linux_ops->to_stopped_by_watchpoint == NULL) |
9c02b525 | 2453 | return 0; |
ebec9a0f | 2454 | |
2989a365 | 2455 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
ebec9a0f PA |
2456 | inferior_ptid = lp->ptid; |
2457 | ||
9c02b525 | 2458 | if (linux_ops->to_stopped_by_watchpoint (linux_ops)) |
ebec9a0f | 2459 | { |
15c66dd6 | 2460 | lp->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; |
9c02b525 | 2461 | |
ebec9a0f PA |
2462 | if (linux_ops->to_stopped_data_address != NULL) |
2463 | lp->stopped_data_address_p = | |
2464 | linux_ops->to_stopped_data_address (¤t_target, | |
2465 | &lp->stopped_data_address); | |
2466 | else | |
2467 | lp->stopped_data_address_p = 0; | |
2468 | } | |
2469 | ||
15c66dd6 | 2470 | return lp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
9c02b525 PA |
2471 | } |
2472 | ||
9c02b525 | 2473 | /* Returns true if the LWP had stopped for a watchpoint. */ |
ebec9a0f PA |
2474 | |
2475 | static int | |
6a109b6b | 2476 | linux_nat_stopped_by_watchpoint (struct target_ops *ops) |
ebec9a0f PA |
2477 | { |
2478 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2479 | ||
2480 | gdb_assert (lp != NULL); | |
2481 | ||
15c66dd6 | 2482 | return lp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
ebec9a0f PA |
2483 | } |
2484 | ||
2485 | static int | |
2486 | linux_nat_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p) | |
2487 | { | |
2488 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2489 | ||
2490 | gdb_assert (lp != NULL); | |
2491 | ||
2492 | *addr_p = lp->stopped_data_address; | |
2493 | ||
2494 | return lp->stopped_data_address_p; | |
2495 | } | |
2496 | ||
26ab7092 JK |
2497 | /* Commonly any breakpoint / watchpoint generate only SIGTRAP. */ |
2498 | ||
2499 | static int | |
2500 | sigtrap_is_event (int status) | |
2501 | { | |
2502 | return WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP; | |
2503 | } | |
2504 | ||
26ab7092 JK |
2505 | /* Set alternative SIGTRAP-like events recognizer. If |
2506 | breakpoint_inserted_here_p there then gdbarch_decr_pc_after_break will be | |
2507 | applied. */ | |
2508 | ||
2509 | void | |
2510 | linux_nat_set_status_is_event (struct target_ops *t, | |
2511 | int (*status_is_event) (int status)) | |
2512 | { | |
2513 | linux_nat_status_is_event = status_is_event; | |
2514 | } | |
2515 | ||
57380f4e DJ |
2516 | /* Wait until LP is stopped. */ |
2517 | ||
2518 | static int | |
2519 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2520 | { | |
c9657e70 | 2521 | struct inferior *inf = find_inferior_ptid (lp->ptid); |
6c95b8df PA |
2522 | |
2523 | /* If this is a vfork parent, bail out, it is not going to report | |
2524 | any SIGSTOP until the vfork is done with. */ | |
2525 | if (inf->vfork_child != NULL) | |
2526 | return 0; | |
2527 | ||
d6b0e80f AC |
2528 | if (!lp->stopped) |
2529 | { | |
2530 | int status; | |
2531 | ||
2532 | status = wait_lwp (lp); | |
2533 | if (status == 0) | |
2534 | return 0; | |
2535 | ||
57380f4e DJ |
2536 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2537 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2538 | { |
57380f4e | 2539 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2540 | |
2541 | errno = 0; | |
dfd4cc63 | 2542 | ptrace (PTRACE_CONT, ptid_get_lwp (lp->ptid), 0, 0); |
8817a6f2 | 2543 | lp->stopped = 0; |
d6b0e80f AC |
2544 | if (debug_linux_nat) |
2545 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2546 | "PTRACE_CONT %s, 0, 0 (%s) " |
2547 | "(discarding SIGINT)\n", | |
d6b0e80f AC |
2548 | target_pid_to_str (lp->ptid), |
2549 | errno ? safe_strerror (errno) : "OK"); | |
2550 | ||
57380f4e | 2551 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2552 | } |
2553 | ||
57380f4e DJ |
2554 | maybe_clear_ignore_sigint (lp); |
2555 | ||
d6b0e80f AC |
2556 | if (WSTOPSIG (status) != SIGSTOP) |
2557 | { | |
e5ef252a | 2558 | /* The thread was stopped with a signal other than SIGSTOP. */ |
7feb7d06 | 2559 | |
e5ef252a PA |
2560 | if (debug_linux_nat) |
2561 | fprintf_unfiltered (gdb_stdlog, | |
2562 | "SWC: Pending event %s in %s\n", | |
2563 | status_to_str ((int) status), | |
2564 | target_pid_to_str (lp->ptid)); | |
2565 | ||
2566 | /* Save the sigtrap event. */ | |
2567 | lp->status = status; | |
e5ef252a | 2568 | gdb_assert (lp->signalled); |
e7ad2f14 | 2569 | save_stop_reason (lp); |
d6b0e80f AC |
2570 | } |
2571 | else | |
2572 | { | |
2573 | /* We caught the SIGSTOP that we intended to catch, so | |
2574 | there's no SIGSTOP pending. */ | |
e5ef252a PA |
2575 | |
2576 | if (debug_linux_nat) | |
2577 | fprintf_unfiltered (gdb_stdlog, | |
2bf6fb9d | 2578 | "SWC: Expected SIGSTOP caught for %s.\n", |
e5ef252a PA |
2579 | target_pid_to_str (lp->ptid)); |
2580 | ||
e5ef252a PA |
2581 | /* Reset SIGNALLED only after the stop_wait_callback call |
2582 | above as it does gdb_assert on SIGNALLED. */ | |
d6b0e80f AC |
2583 | lp->signalled = 0; |
2584 | } | |
2585 | } | |
2586 | ||
2587 | return 0; | |
2588 | } | |
2589 | ||
9c02b525 PA |
2590 | /* Return non-zero if LP has a wait status pending. Discard the |
2591 | pending event and resume the LWP if the event that originally | |
2592 | caused the stop became uninteresting. */ | |
d6b0e80f AC |
2593 | |
2594 | static int | |
2595 | status_callback (struct lwp_info *lp, void *data) | |
2596 | { | |
2597 | /* Only report a pending wait status if we pretend that this has | |
2598 | indeed been resumed. */ | |
ca2163eb PA |
2599 | if (!lp->resumed) |
2600 | return 0; | |
2601 | ||
eb54c8bf PA |
2602 | if (!lwp_status_pending_p (lp)) |
2603 | return 0; | |
2604 | ||
15c66dd6 PA |
2605 | if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
2606 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) | |
9c02b525 PA |
2607 | { |
2608 | struct regcache *regcache = get_thread_regcache (lp->ptid); | |
9c02b525 PA |
2609 | CORE_ADDR pc; |
2610 | int discard = 0; | |
2611 | ||
9c02b525 PA |
2612 | pc = regcache_read_pc (regcache); |
2613 | ||
2614 | if (pc != lp->stop_pc) | |
2615 | { | |
2616 | if (debug_linux_nat) | |
2617 | fprintf_unfiltered (gdb_stdlog, | |
2618 | "SC: PC of %s changed. was=%s, now=%s\n", | |
2619 | target_pid_to_str (lp->ptid), | |
2620 | paddress (target_gdbarch (), lp->stop_pc), | |
2621 | paddress (target_gdbarch (), pc)); | |
2622 | discard = 1; | |
2623 | } | |
faf09f01 PA |
2624 | |
2625 | #if !USE_SIGTRAP_SIGINFO | |
a01bda52 | 2626 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
9c02b525 PA |
2627 | { |
2628 | if (debug_linux_nat) | |
2629 | fprintf_unfiltered (gdb_stdlog, | |
2630 | "SC: previous breakpoint of %s, at %s gone\n", | |
2631 | target_pid_to_str (lp->ptid), | |
2632 | paddress (target_gdbarch (), lp->stop_pc)); | |
2633 | ||
2634 | discard = 1; | |
2635 | } | |
faf09f01 | 2636 | #endif |
9c02b525 PA |
2637 | |
2638 | if (discard) | |
2639 | { | |
2640 | if (debug_linux_nat) | |
2641 | fprintf_unfiltered (gdb_stdlog, | |
2642 | "SC: pending event of %s cancelled.\n", | |
2643 | target_pid_to_str (lp->ptid)); | |
2644 | ||
2645 | lp->status = 0; | |
2646 | linux_resume_one_lwp (lp, lp->step, GDB_SIGNAL_0); | |
2647 | return 0; | |
2648 | } | |
9c02b525 PA |
2649 | } |
2650 | ||
eb54c8bf | 2651 | return 1; |
d6b0e80f AC |
2652 | } |
2653 | ||
d6b0e80f AC |
2654 | /* Count the LWP's that have had events. */ |
2655 | ||
2656 | static int | |
2657 | count_events_callback (struct lwp_info *lp, void *data) | |
2658 | { | |
9a3c8263 | 2659 | int *count = (int *) data; |
d6b0e80f AC |
2660 | |
2661 | gdb_assert (count != NULL); | |
2662 | ||
9c02b525 PA |
2663 | /* Select only resumed LWPs that have an event pending. */ |
2664 | if (lp->resumed && lwp_status_pending_p (lp)) | |
d6b0e80f AC |
2665 | (*count)++; |
2666 | ||
2667 | return 0; | |
2668 | } | |
2669 | ||
2670 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2671 | ||
2672 | static int | |
2673 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2674 | { | |
25289eb2 PA |
2675 | if (lp->last_resume_kind == resume_step |
2676 | && lp->status != 0) | |
d6b0e80f AC |
2677 | return 1; |
2678 | else | |
2679 | return 0; | |
2680 | } | |
2681 | ||
8a99810d PA |
2682 | /* Returns true if LP has a status pending. */ |
2683 | ||
2684 | static int | |
2685 | lwp_status_pending_p (struct lwp_info *lp) | |
2686 | { | |
2687 | /* We check for lp->waitstatus in addition to lp->status, because we | |
2688 | can have pending process exits recorded in lp->status and | |
2689 | W_EXITCODE(0,0) happens to be 0. */ | |
2690 | return lp->status != 0 || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE; | |
2691 | } | |
2692 | ||
b90fc188 | 2693 | /* Select the Nth LWP that has had an event. */ |
d6b0e80f AC |
2694 | |
2695 | static int | |
2696 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2697 | { | |
9a3c8263 | 2698 | int *selector = (int *) data; |
d6b0e80f AC |
2699 | |
2700 | gdb_assert (selector != NULL); | |
2701 | ||
9c02b525 PA |
2702 | /* Select only resumed LWPs that have an event pending. */ |
2703 | if (lp->resumed && lwp_status_pending_p (lp)) | |
d6b0e80f AC |
2704 | if ((*selector)-- == 0) |
2705 | return 1; | |
2706 | ||
2707 | return 0; | |
2708 | } | |
2709 | ||
e7ad2f14 PA |
2710 | /* Called when the LWP stopped for a signal/trap. If it stopped for a |
2711 | trap check what caused it (breakpoint, watchpoint, trace, etc.), | |
2712 | and save the result in the LWP's stop_reason field. If it stopped | |
2713 | for a breakpoint, decrement the PC if necessary on the lwp's | |
2714 | architecture. */ | |
9c02b525 | 2715 | |
e7ad2f14 PA |
2716 | static void |
2717 | save_stop_reason (struct lwp_info *lp) | |
710151dd | 2718 | { |
e7ad2f14 PA |
2719 | struct regcache *regcache; |
2720 | struct gdbarch *gdbarch; | |
515630c5 | 2721 | CORE_ADDR pc; |
9c02b525 | 2722 | CORE_ADDR sw_bp_pc; |
faf09f01 PA |
2723 | #if USE_SIGTRAP_SIGINFO |
2724 | siginfo_t siginfo; | |
2725 | #endif | |
9c02b525 | 2726 | |
e7ad2f14 PA |
2727 | gdb_assert (lp->stop_reason == TARGET_STOPPED_BY_NO_REASON); |
2728 | gdb_assert (lp->status != 0); | |
2729 | ||
2730 | if (!linux_nat_status_is_event (lp->status)) | |
2731 | return; | |
2732 | ||
2733 | regcache = get_thread_regcache (lp->ptid); | |
ac7936df | 2734 | gdbarch = regcache->arch (); |
e7ad2f14 | 2735 | |
9c02b525 | 2736 | pc = regcache_read_pc (regcache); |
527a273a | 2737 | sw_bp_pc = pc - gdbarch_decr_pc_after_break (gdbarch); |
515630c5 | 2738 | |
faf09f01 PA |
2739 | #if USE_SIGTRAP_SIGINFO |
2740 | if (linux_nat_get_siginfo (lp->ptid, &siginfo)) | |
2741 | { | |
2742 | if (siginfo.si_signo == SIGTRAP) | |
2743 | { | |
e7ad2f14 PA |
2744 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code) |
2745 | && GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) | |
faf09f01 | 2746 | { |
e7ad2f14 PA |
2747 | /* The si_code is ambiguous on this arch -- check debug |
2748 | registers. */ | |
2749 | if (!check_stopped_by_watchpoint (lp)) | |
2750 | lp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
2751 | } | |
2752 | else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) | |
2753 | { | |
2754 | /* If we determine the LWP stopped for a SW breakpoint, | |
2755 | trust it. Particularly don't check watchpoint | |
2756 | registers, because at least on s390, we'd find | |
2757 | stopped-by-watchpoint as long as there's a watchpoint | |
2758 | set. */ | |
faf09f01 | 2759 | lp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
faf09f01 | 2760 | } |
e7ad2f14 | 2761 | else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) |
faf09f01 | 2762 | { |
e7ad2f14 PA |
2763 | /* This can indicate either a hardware breakpoint or |
2764 | hardware watchpoint. Check debug registers. */ | |
2765 | if (!check_stopped_by_watchpoint (lp)) | |
2766 | lp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
faf09f01 | 2767 | } |
2bf6fb9d PA |
2768 | else if (siginfo.si_code == TRAP_TRACE) |
2769 | { | |
2770 | if (debug_linux_nat) | |
2771 | fprintf_unfiltered (gdb_stdlog, | |
2772 | "CSBB: %s stopped by trace\n", | |
2773 | target_pid_to_str (lp->ptid)); | |
e7ad2f14 PA |
2774 | |
2775 | /* We may have single stepped an instruction that | |
2776 | triggered a watchpoint. In that case, on some | |
2777 | architectures (such as x86), instead of TRAP_HWBKPT, | |
2778 | si_code indicates TRAP_TRACE, and we need to check | |
2779 | the debug registers separately. */ | |
2780 | check_stopped_by_watchpoint (lp); | |
2bf6fb9d | 2781 | } |
faf09f01 PA |
2782 | } |
2783 | } | |
2784 | #else | |
9c02b525 | 2785 | if ((!lp->step || lp->stop_pc == sw_bp_pc) |
a01bda52 | 2786 | && software_breakpoint_inserted_here_p (regcache->aspace (), |
9c02b525 | 2787 | sw_bp_pc)) |
710151dd | 2788 | { |
9c02b525 PA |
2789 | /* The LWP was either continued, or stepped a software |
2790 | breakpoint instruction. */ | |
e7ad2f14 PA |
2791 | lp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
2792 | } | |
2793 | ||
a01bda52 | 2794 | if (hardware_breakpoint_inserted_here_p (regcache->aspace (), pc)) |
e7ad2f14 PA |
2795 | lp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; |
2796 | ||
2797 | if (lp->stop_reason == TARGET_STOPPED_BY_NO_REASON) | |
2798 | check_stopped_by_watchpoint (lp); | |
2799 | #endif | |
2800 | ||
2801 | if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) | |
2802 | { | |
710151dd PA |
2803 | if (debug_linux_nat) |
2804 | fprintf_unfiltered (gdb_stdlog, | |
2bf6fb9d | 2805 | "CSBB: %s stopped by software breakpoint\n", |
710151dd PA |
2806 | target_pid_to_str (lp->ptid)); |
2807 | ||
2808 | /* Back up the PC if necessary. */ | |
9c02b525 PA |
2809 | if (pc != sw_bp_pc) |
2810 | regcache_write_pc (regcache, sw_bp_pc); | |
515630c5 | 2811 | |
e7ad2f14 PA |
2812 | /* Update this so we record the correct stop PC below. */ |
2813 | pc = sw_bp_pc; | |
710151dd | 2814 | } |
e7ad2f14 | 2815 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) |
9c02b525 PA |
2816 | { |
2817 | if (debug_linux_nat) | |
2818 | fprintf_unfiltered (gdb_stdlog, | |
e7ad2f14 PA |
2819 | "CSBB: %s stopped by hardware breakpoint\n", |
2820 | target_pid_to_str (lp->ptid)); | |
2821 | } | |
2822 | else if (lp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) | |
2823 | { | |
2824 | if (debug_linux_nat) | |
2825 | fprintf_unfiltered (gdb_stdlog, | |
2826 | "CSBB: %s stopped by hardware watchpoint\n", | |
9c02b525 | 2827 | target_pid_to_str (lp->ptid)); |
9c02b525 | 2828 | } |
d6b0e80f | 2829 | |
e7ad2f14 | 2830 | lp->stop_pc = pc; |
d6b0e80f AC |
2831 | } |
2832 | ||
faf09f01 PA |
2833 | |
2834 | /* Returns true if the LWP had stopped for a software breakpoint. */ | |
2835 | ||
2836 | static int | |
2837 | linux_nat_stopped_by_sw_breakpoint (struct target_ops *ops) | |
2838 | { | |
2839 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2840 | ||
2841 | gdb_assert (lp != NULL); | |
2842 | ||
2843 | return lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT; | |
2844 | } | |
2845 | ||
2846 | /* Implement the supports_stopped_by_sw_breakpoint method. */ | |
2847 | ||
2848 | static int | |
2849 | linux_nat_supports_stopped_by_sw_breakpoint (struct target_ops *ops) | |
2850 | { | |
2851 | return USE_SIGTRAP_SIGINFO; | |
2852 | } | |
2853 | ||
2854 | /* Returns true if the LWP had stopped for a hardware | |
2855 | breakpoint/watchpoint. */ | |
2856 | ||
2857 | static int | |
2858 | linux_nat_stopped_by_hw_breakpoint (struct target_ops *ops) | |
2859 | { | |
2860 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2861 | ||
2862 | gdb_assert (lp != NULL); | |
2863 | ||
2864 | return lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT; | |
2865 | } | |
2866 | ||
2867 | /* Implement the supports_stopped_by_hw_breakpoint method. */ | |
2868 | ||
2869 | static int | |
2870 | linux_nat_supports_stopped_by_hw_breakpoint (struct target_ops *ops) | |
2871 | { | |
2872 | return USE_SIGTRAP_SIGINFO; | |
2873 | } | |
2874 | ||
d6b0e80f AC |
2875 | /* Select one LWP out of those that have events pending. */ |
2876 | ||
2877 | static void | |
d90e17a7 | 2878 | select_event_lwp (ptid_t filter, struct lwp_info **orig_lp, int *status) |
d6b0e80f AC |
2879 | { |
2880 | int num_events = 0; | |
2881 | int random_selector; | |
9c02b525 | 2882 | struct lwp_info *event_lp = NULL; |
d6b0e80f | 2883 | |
ac264b3b | 2884 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
2885 | (*orig_lp)->status = *status; |
2886 | ||
9c02b525 PA |
2887 | /* In all-stop, give preference to the LWP that is being |
2888 | single-stepped. There will be at most one, and it will be the | |
2889 | LWP that the core is most interested in. If we didn't do this, | |
2890 | then we'd have to handle pending step SIGTRAPs somehow in case | |
2891 | the core later continues the previously-stepped thread, as | |
2892 | otherwise we'd report the pending SIGTRAP then, and the core, not | |
2893 | having stepped the thread, wouldn't understand what the trap was | |
2894 | for, and therefore would report it to the user as a random | |
2895 | signal. */ | |
fbea99ea | 2896 | if (!target_is_non_stop_p ()) |
d6b0e80f | 2897 | { |
9c02b525 PA |
2898 | event_lp = iterate_over_lwps (filter, |
2899 | select_singlestep_lwp_callback, NULL); | |
2900 | if (event_lp != NULL) | |
2901 | { | |
2902 | if (debug_linux_nat) | |
2903 | fprintf_unfiltered (gdb_stdlog, | |
2904 | "SEL: Select single-step %s\n", | |
2905 | target_pid_to_str (event_lp->ptid)); | |
2906 | } | |
d6b0e80f | 2907 | } |
9c02b525 PA |
2908 | |
2909 | if (event_lp == NULL) | |
d6b0e80f | 2910 | { |
9c02b525 | 2911 | /* Pick one at random, out of those which have had events. */ |
d6b0e80f | 2912 | |
9c02b525 | 2913 | /* First see how many events we have. */ |
d90e17a7 | 2914 | iterate_over_lwps (filter, count_events_callback, &num_events); |
8bf3b159 | 2915 | gdb_assert (num_events > 0); |
d6b0e80f | 2916 | |
9c02b525 PA |
2917 | /* Now randomly pick a LWP out of those that have had |
2918 | events. */ | |
d6b0e80f AC |
2919 | random_selector = (int) |
2920 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2921 | ||
2922 | if (debug_linux_nat && num_events > 1) | |
2923 | fprintf_unfiltered (gdb_stdlog, | |
9c02b525 | 2924 | "SEL: Found %d events, selecting #%d\n", |
d6b0e80f AC |
2925 | num_events, random_selector); |
2926 | ||
d90e17a7 PA |
2927 | event_lp = iterate_over_lwps (filter, |
2928 | select_event_lwp_callback, | |
d6b0e80f AC |
2929 | &random_selector); |
2930 | } | |
2931 | ||
2932 | if (event_lp != NULL) | |
2933 | { | |
2934 | /* Switch the event LWP. */ | |
2935 | *orig_lp = event_lp; | |
2936 | *status = event_lp->status; | |
2937 | } | |
2938 | ||
2939 | /* Flush the wait status for the event LWP. */ | |
2940 | (*orig_lp)->status = 0; | |
2941 | } | |
2942 | ||
2943 | /* Return non-zero if LP has been resumed. */ | |
2944 | ||
2945 | static int | |
2946 | resumed_callback (struct lwp_info *lp, void *data) | |
2947 | { | |
2948 | return lp->resumed; | |
2949 | } | |
2950 | ||
02f3fc28 | 2951 | /* Check if we should go on and pass this event to common code. |
9c02b525 | 2952 | Return the affected lwp if we are, or NULL otherwise. */ |
12d9289a | 2953 | |
02f3fc28 | 2954 | static struct lwp_info * |
9c02b525 | 2955 | linux_nat_filter_event (int lwpid, int status) |
02f3fc28 PA |
2956 | { |
2957 | struct lwp_info *lp; | |
89a5711c | 2958 | int event = linux_ptrace_get_extended_event (status); |
02f3fc28 PA |
2959 | |
2960 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
2961 | ||
2962 | /* Check for stop events reported by a process we didn't already | |
2963 | know about - anything not already in our LWP list. | |
2964 | ||
2965 | If we're expecting to receive stopped processes after | |
2966 | fork, vfork, and clone events, then we'll just add the | |
2967 | new one to our list and go back to waiting for the event | |
2968 | to be reported - the stopped process might be returned | |
0e5bf2a8 PA |
2969 | from waitpid before or after the event is. |
2970 | ||
2971 | But note the case of a non-leader thread exec'ing after the | |
2972 | leader having exited, and gone from our lists. The non-leader | |
2973 | thread changes its tid to the tgid. */ | |
2974 | ||
2975 | if (WIFSTOPPED (status) && lp == NULL | |
89a5711c | 2976 | && (WSTOPSIG (status) == SIGTRAP && event == PTRACE_EVENT_EXEC)) |
0e5bf2a8 PA |
2977 | { |
2978 | /* A multi-thread exec after we had seen the leader exiting. */ | |
2979 | if (debug_linux_nat) | |
2980 | fprintf_unfiltered (gdb_stdlog, | |
2981 | "LLW: Re-adding thread group leader LWP %d.\n", | |
2982 | lwpid); | |
2983 | ||
dfd4cc63 | 2984 | lp = add_lwp (ptid_build (lwpid, lwpid, 0)); |
0e5bf2a8 PA |
2985 | lp->stopped = 1; |
2986 | lp->resumed = 1; | |
2987 | add_thread (lp->ptid); | |
2988 | } | |
2989 | ||
02f3fc28 PA |
2990 | if (WIFSTOPPED (status) && !lp) |
2991 | { | |
3b27ef47 PA |
2992 | if (debug_linux_nat) |
2993 | fprintf_unfiltered (gdb_stdlog, | |
2994 | "LHEW: saving LWP %ld status %s in stopped_pids list\n", | |
2995 | (long) lwpid, status_to_str (status)); | |
84636d28 | 2996 | add_to_pid_list (&stopped_pids, lwpid, status); |
02f3fc28 PA |
2997 | return NULL; |
2998 | } | |
2999 | ||
3000 | /* Make sure we don't report an event for the exit of an LWP not in | |
1777feb0 | 3001 | our list, i.e. not part of the current process. This can happen |
fd62cb89 | 3002 | if we detach from a program we originally forked and then it |
02f3fc28 PA |
3003 | exits. */ |
3004 | if (!WIFSTOPPED (status) && !lp) | |
3005 | return NULL; | |
3006 | ||
8817a6f2 PA |
3007 | /* This LWP is stopped now. (And if dead, this prevents it from |
3008 | ever being continued.) */ | |
3009 | lp->stopped = 1; | |
3010 | ||
8784d563 PA |
3011 | if (WIFSTOPPED (status) && lp->must_set_ptrace_flags) |
3012 | { | |
3013 | struct inferior *inf = find_inferior_pid (ptid_get_pid (lp->ptid)); | |
de0d863e | 3014 | int options = linux_nat_ptrace_options (inf->attach_flag); |
8784d563 | 3015 | |
de0d863e | 3016 | linux_enable_event_reporting (ptid_get_lwp (lp->ptid), options); |
8784d563 PA |
3017 | lp->must_set_ptrace_flags = 0; |
3018 | } | |
3019 | ||
ca2163eb PA |
3020 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
3021 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
3022 | { | |
3023 | /* No longer need the sysgood bit. The ptrace event ends up | |
3024 | recorded in lp->waitstatus if we care for it. We can carry | |
3025 | on handling the event like a regular SIGTRAP from here | |
3026 | on. */ | |
3027 | status = W_STOPCODE (SIGTRAP); | |
3028 | if (linux_handle_syscall_trap (lp, 0)) | |
3029 | return NULL; | |
3030 | } | |
bfd09d20 JS |
3031 | else |
3032 | { | |
3033 | /* Almost all other ptrace-stops are known to be outside of system | |
3034 | calls, with further exceptions in linux_handle_extended_wait. */ | |
3035 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
3036 | } | |
02f3fc28 | 3037 | |
ca2163eb | 3038 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
89a5711c DB |
3039 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP |
3040 | && linux_is_extended_waitstatus (status)) | |
02f3fc28 PA |
3041 | { |
3042 | if (debug_linux_nat) | |
3043 | fprintf_unfiltered (gdb_stdlog, | |
3044 | "LLW: Handling extended status 0x%06x\n", | |
3045 | status); | |
4dd63d48 | 3046 | if (linux_handle_extended_wait (lp, status)) |
02f3fc28 PA |
3047 | return NULL; |
3048 | } | |
3049 | ||
3050 | /* Check if the thread has exited. */ | |
9c02b525 PA |
3051 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
3052 | { | |
aa01bd36 PA |
3053 | if (!report_thread_events |
3054 | && num_lwps (ptid_get_pid (lp->ptid)) > 1) | |
02f3fc28 | 3055 | { |
9c02b525 PA |
3056 | if (debug_linux_nat) |
3057 | fprintf_unfiltered (gdb_stdlog, | |
3058 | "LLW: %s exited.\n", | |
3059 | target_pid_to_str (lp->ptid)); | |
3060 | ||
4a6ed09b PA |
3061 | /* If there is at least one more LWP, then the exit signal |
3062 | was not the end of the debugged application and should be | |
3063 | ignored. */ | |
3064 | exit_lwp (lp); | |
3065 | return NULL; | |
02f3fc28 PA |
3066 | } |
3067 | ||
77598427 PA |
3068 | /* Note that even if the leader was ptrace-stopped, it can still |
3069 | exit, if e.g., some other thread brings down the whole | |
3070 | process (calls `exit'). So don't assert that the lwp is | |
3071 | resumed. */ | |
02f3fc28 PA |
3072 | if (debug_linux_nat) |
3073 | fprintf_unfiltered (gdb_stdlog, | |
aa01bd36 | 3074 | "LWP %ld exited (resumed=%d)\n", |
77598427 | 3075 | ptid_get_lwp (lp->ptid), lp->resumed); |
02f3fc28 | 3076 | |
9c02b525 PA |
3077 | /* Dead LWP's aren't expected to reported a pending sigstop. */ |
3078 | lp->signalled = 0; | |
3079 | ||
3080 | /* Store the pending event in the waitstatus, because | |
3081 | W_EXITCODE(0,0) == 0. */ | |
3082 | store_waitstatus (&lp->waitstatus, status); | |
3083 | return lp; | |
02f3fc28 PA |
3084 | } |
3085 | ||
02f3fc28 PA |
3086 | /* Make sure we don't report a SIGSTOP that we sent ourselves in |
3087 | an attempt to stop an LWP. */ | |
3088 | if (lp->signalled | |
3089 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
3090 | { | |
02f3fc28 PA |
3091 | lp->signalled = 0; |
3092 | ||
2bf6fb9d | 3093 | if (lp->last_resume_kind == resume_stop) |
25289eb2 | 3094 | { |
2bf6fb9d PA |
3095 | if (debug_linux_nat) |
3096 | fprintf_unfiltered (gdb_stdlog, | |
3097 | "LLW: resume_stop SIGSTOP caught for %s.\n", | |
3098 | target_pid_to_str (lp->ptid)); | |
3099 | } | |
3100 | else | |
3101 | { | |
3102 | /* This is a delayed SIGSTOP. Filter out the event. */ | |
02f3fc28 | 3103 | |
25289eb2 PA |
3104 | if (debug_linux_nat) |
3105 | fprintf_unfiltered (gdb_stdlog, | |
2bf6fb9d | 3106 | "LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", |
25289eb2 PA |
3107 | lp->step ? |
3108 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3109 | target_pid_to_str (lp->ptid)); | |
02f3fc28 | 3110 | |
2bf6fb9d | 3111 | linux_resume_one_lwp (lp, lp->step, GDB_SIGNAL_0); |
25289eb2 | 3112 | gdb_assert (lp->resumed); |
25289eb2 PA |
3113 | return NULL; |
3114 | } | |
02f3fc28 PA |
3115 | } |
3116 | ||
57380f4e DJ |
3117 | /* Make sure we don't report a SIGINT that we have already displayed |
3118 | for another thread. */ | |
3119 | if (lp->ignore_sigint | |
3120 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
3121 | { | |
3122 | if (debug_linux_nat) | |
3123 | fprintf_unfiltered (gdb_stdlog, | |
3124 | "LLW: Delayed SIGINT caught for %s.\n", | |
3125 | target_pid_to_str (lp->ptid)); | |
3126 | ||
3127 | /* This is a delayed SIGINT. */ | |
3128 | lp->ignore_sigint = 0; | |
3129 | ||
8a99810d | 3130 | linux_resume_one_lwp (lp, lp->step, GDB_SIGNAL_0); |
57380f4e DJ |
3131 | if (debug_linux_nat) |
3132 | fprintf_unfiltered (gdb_stdlog, | |
3133 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
3134 | lp->step ? | |
3135 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3136 | target_pid_to_str (lp->ptid)); | |
57380f4e DJ |
3137 | gdb_assert (lp->resumed); |
3138 | ||
3139 | /* Discard the event. */ | |
3140 | return NULL; | |
3141 | } | |
3142 | ||
9c02b525 PA |
3143 | /* Don't report signals that GDB isn't interested in, such as |
3144 | signals that are neither printed nor stopped upon. Stopping all | |
3145 | threads can be a bit time-consuming so if we want decent | |
3146 | performance with heavily multi-threaded programs, especially when | |
3147 | they're using a high frequency timer, we'd better avoid it if we | |
3148 | can. */ | |
3149 | if (WIFSTOPPED (status)) | |
3150 | { | |
3151 | enum gdb_signal signo = gdb_signal_from_host (WSTOPSIG (status)); | |
3152 | ||
fbea99ea | 3153 | if (!target_is_non_stop_p ()) |
9c02b525 PA |
3154 | { |
3155 | /* Only do the below in all-stop, as we currently use SIGSTOP | |
3156 | to implement target_stop (see linux_nat_stop) in | |
3157 | non-stop. */ | |
3158 | if (signo == GDB_SIGNAL_INT && signal_pass_state (signo) == 0) | |
3159 | { | |
3160 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
3161 | forwarded to the entire process group, that is, all LWPs | |
3162 | will receive it - unless they're using CLONE_THREAD to | |
3163 | share signals. Since we only want to report it once, we | |
3164 | mark it as ignored for all LWPs except this one. */ | |
3165 | iterate_over_lwps (pid_to_ptid (ptid_get_pid (lp->ptid)), | |
3166 | set_ignore_sigint, NULL); | |
3167 | lp->ignore_sigint = 0; | |
3168 | } | |
3169 | else | |
3170 | maybe_clear_ignore_sigint (lp); | |
3171 | } | |
3172 | ||
3173 | /* When using hardware single-step, we need to report every signal. | |
c9587f88 AT |
3174 | Otherwise, signals in pass_mask may be short-circuited |
3175 | except signals that might be caused by a breakpoint. */ | |
9c02b525 | 3176 | if (!lp->step |
c9587f88 AT |
3177 | && WSTOPSIG (status) && sigismember (&pass_mask, WSTOPSIG (status)) |
3178 | && !linux_wstatus_maybe_breakpoint (status)) | |
9c02b525 PA |
3179 | { |
3180 | linux_resume_one_lwp (lp, lp->step, signo); | |
3181 | if (debug_linux_nat) | |
3182 | fprintf_unfiltered (gdb_stdlog, | |
3183 | "LLW: %s %s, %s (preempt 'handle')\n", | |
3184 | lp->step ? | |
3185 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3186 | target_pid_to_str (lp->ptid), | |
3187 | (signo != GDB_SIGNAL_0 | |
3188 | ? strsignal (gdb_signal_to_host (signo)) | |
3189 | : "0")); | |
3190 | return NULL; | |
3191 | } | |
3192 | } | |
3193 | ||
02f3fc28 PA |
3194 | /* An interesting event. */ |
3195 | gdb_assert (lp); | |
ca2163eb | 3196 | lp->status = status; |
e7ad2f14 | 3197 | save_stop_reason (lp); |
02f3fc28 PA |
3198 | return lp; |
3199 | } | |
3200 | ||
0e5bf2a8 PA |
3201 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
3202 | their exits until all other threads in the group have exited. */ | |
3203 | ||
3204 | static void | |
3205 | check_zombie_leaders (void) | |
3206 | { | |
3207 | struct inferior *inf; | |
3208 | ||
3209 | ALL_INFERIORS (inf) | |
3210 | { | |
3211 | struct lwp_info *leader_lp; | |
3212 | ||
3213 | if (inf->pid == 0) | |
3214 | continue; | |
3215 | ||
3216 | leader_lp = find_lwp_pid (pid_to_ptid (inf->pid)); | |
3217 | if (leader_lp != NULL | |
3218 | /* Check if there are other threads in the group, as we may | |
3219 | have raced with the inferior simply exiting. */ | |
3220 | && num_lwps (inf->pid) > 1 | |
5f572dec | 3221 | && linux_proc_pid_is_zombie (inf->pid)) |
0e5bf2a8 PA |
3222 | { |
3223 | if (debug_linux_nat) | |
3224 | fprintf_unfiltered (gdb_stdlog, | |
3225 | "CZL: Thread group leader %d zombie " | |
3226 | "(it exited, or another thread execd).\n", | |
3227 | inf->pid); | |
3228 | ||
3229 | /* A leader zombie can mean one of two things: | |
3230 | ||
3231 | - It exited, and there's an exit status pending | |
3232 | available, or only the leader exited (not the whole | |
3233 | program). In the latter case, we can't waitpid the | |
3234 | leader's exit status until all other threads are gone. | |
3235 | ||
3236 | - There are 3 or more threads in the group, and a thread | |
4a6ed09b PA |
3237 | other than the leader exec'd. See comments on exec |
3238 | events at the top of the file. We could try | |
0e5bf2a8 PA |
3239 | distinguishing the exit and exec cases, by waiting once |
3240 | more, and seeing if something comes out, but it doesn't | |
3241 | sound useful. The previous leader _does_ go away, and | |
3242 | we'll re-add the new one once we see the exec event | |
3243 | (which is just the same as what would happen if the | |
3244 | previous leader did exit voluntarily before some other | |
3245 | thread execs). */ | |
3246 | ||
3247 | if (debug_linux_nat) | |
3248 | fprintf_unfiltered (gdb_stdlog, | |
3249 | "CZL: Thread group leader %d vanished.\n", | |
3250 | inf->pid); | |
3251 | exit_lwp (leader_lp); | |
3252 | } | |
3253 | } | |
3254 | } | |
3255 | ||
aa01bd36 PA |
3256 | /* Convenience function that is called when the kernel reports an exit |
3257 | event. This decides whether to report the event to GDB as a | |
3258 | process exit event, a thread exit event, or to suppress the | |
3259 | event. */ | |
3260 | ||
3261 | static ptid_t | |
3262 | filter_exit_event (struct lwp_info *event_child, | |
3263 | struct target_waitstatus *ourstatus) | |
3264 | { | |
3265 | ptid_t ptid = event_child->ptid; | |
3266 | ||
3267 | if (num_lwps (ptid_get_pid (ptid)) > 1) | |
3268 | { | |
3269 | if (report_thread_events) | |
3270 | ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED; | |
3271 | else | |
3272 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3273 | ||
3274 | exit_lwp (event_child); | |
3275 | } | |
3276 | ||
3277 | return ptid; | |
3278 | } | |
3279 | ||
d6b0e80f | 3280 | static ptid_t |
7feb7d06 | 3281 | linux_nat_wait_1 (struct target_ops *ops, |
47608cb1 PA |
3282 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3283 | int target_options) | |
d6b0e80f | 3284 | { |
fc9b8e47 | 3285 | sigset_t prev_mask; |
4b60df3d | 3286 | enum resume_kind last_resume_kind; |
12d9289a | 3287 | struct lwp_info *lp; |
12d9289a | 3288 | int status; |
d6b0e80f | 3289 | |
01124a23 | 3290 | if (debug_linux_nat) |
b84876c2 PA |
3291 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); |
3292 | ||
f973ed9c DJ |
3293 | /* The first time we get here after starting a new inferior, we may |
3294 | not have added it to the LWP list yet - this is the earliest | |
3295 | moment at which we know its PID. */ | |
d90e17a7 | 3296 | if (ptid_is_pid (inferior_ptid)) |
f973ed9c | 3297 | { |
27c9d204 PA |
3298 | /* Upgrade the main thread's ptid. */ |
3299 | thread_change_ptid (inferior_ptid, | |
dfd4cc63 LM |
3300 | ptid_build (ptid_get_pid (inferior_ptid), |
3301 | ptid_get_pid (inferior_ptid), 0)); | |
27c9d204 | 3302 | |
26cb8b7c | 3303 | lp = add_initial_lwp (inferior_ptid); |
f973ed9c DJ |
3304 | lp->resumed = 1; |
3305 | } | |
3306 | ||
12696c10 | 3307 | /* Make sure SIGCHLD is blocked until the sigsuspend below. */ |
7feb7d06 | 3308 | block_child_signals (&prev_mask); |
d6b0e80f | 3309 | |
d6b0e80f | 3310 | /* First check if there is a LWP with a wait status pending. */ |
8a99810d PA |
3311 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
3312 | if (lp != NULL) | |
d6b0e80f AC |
3313 | { |
3314 | if (debug_linux_nat) | |
d6b0e80f AC |
3315 | fprintf_unfiltered (gdb_stdlog, |
3316 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3317 | status_to_str (lp->status), |
d6b0e80f | 3318 | target_pid_to_str (lp->ptid)); |
d6b0e80f AC |
3319 | } |
3320 | ||
9c02b525 PA |
3321 | /* But if we don't find a pending event, we'll have to wait. Always |
3322 | pull all events out of the kernel. We'll randomly select an | |
3323 | event LWP out of all that have events, to prevent starvation. */ | |
7feb7d06 | 3324 | |
d90e17a7 | 3325 | while (lp == NULL) |
d6b0e80f AC |
3326 | { |
3327 | pid_t lwpid; | |
3328 | ||
0e5bf2a8 PA |
3329 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
3330 | quirks: | |
3331 | ||
3332 | - If the thread group leader exits while other threads in the | |
3333 | thread group still exist, waitpid(TGID, ...) hangs. That | |
3334 | waitpid won't return an exit status until the other threads | |
3335 | in the group are reapped. | |
3336 | ||
3337 | - When a non-leader thread execs, that thread just vanishes | |
3338 | without reporting an exit (so we'd hang if we waited for it | |
3339 | explicitly in that case). The exec event is reported to | |
3340 | the TGID pid. */ | |
3341 | ||
3342 | errno = 0; | |
4a6ed09b | 3343 | lwpid = my_waitpid (-1, &status, __WALL | WNOHANG); |
0e5bf2a8 PA |
3344 | |
3345 | if (debug_linux_nat) | |
3346 | fprintf_unfiltered (gdb_stdlog, | |
3347 | "LNW: waitpid(-1, ...) returned %d, %s\n", | |
3348 | lwpid, errno ? safe_strerror (errno) : "ERRNO-OK"); | |
b84876c2 | 3349 | |
d6b0e80f AC |
3350 | if (lwpid > 0) |
3351 | { | |
d6b0e80f AC |
3352 | if (debug_linux_nat) |
3353 | { | |
3354 | fprintf_unfiltered (gdb_stdlog, | |
3355 | "LLW: waitpid %ld received %s\n", | |
3356 | (long) lwpid, status_to_str (status)); | |
3357 | } | |
3358 | ||
9c02b525 | 3359 | linux_nat_filter_event (lwpid, status); |
0e5bf2a8 PA |
3360 | /* Retry until nothing comes out of waitpid. A single |
3361 | SIGCHLD can indicate more than one child stopped. */ | |
3362 | continue; | |
d6b0e80f AC |
3363 | } |
3364 | ||
20ba1ce6 PA |
3365 | /* Now that we've pulled all events out of the kernel, resume |
3366 | LWPs that don't have an interesting event to report. */ | |
3367 | iterate_over_lwps (minus_one_ptid, | |
3368 | resume_stopped_resumed_lwps, &minus_one_ptid); | |
3369 | ||
3370 | /* ... and find an LWP with a status to report to the core, if | |
3371 | any. */ | |
9c02b525 PA |
3372 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
3373 | if (lp != NULL) | |
3374 | break; | |
3375 | ||
0e5bf2a8 PA |
3376 | /* Check for zombie thread group leaders. Those can't be reaped |
3377 | until all other threads in the thread group are. */ | |
3378 | check_zombie_leaders (); | |
d6b0e80f | 3379 | |
0e5bf2a8 PA |
3380 | /* If there are no resumed children left, bail. We'd be stuck |
3381 | forever in the sigsuspend call below otherwise. */ | |
3382 | if (iterate_over_lwps (ptid, resumed_callback, NULL) == NULL) | |
3383 | { | |
3384 | if (debug_linux_nat) | |
3385 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (no resumed LWP)\n"); | |
b84876c2 | 3386 | |
0e5bf2a8 | 3387 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
b84876c2 | 3388 | |
0e5bf2a8 PA |
3389 | restore_child_signals_mask (&prev_mask); |
3390 | return minus_one_ptid; | |
d6b0e80f | 3391 | } |
28736962 | 3392 | |
0e5bf2a8 PA |
3393 | /* No interesting event to report to the core. */ |
3394 | ||
3395 | if (target_options & TARGET_WNOHANG) | |
3396 | { | |
01124a23 | 3397 | if (debug_linux_nat) |
28736962 PA |
3398 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); |
3399 | ||
0e5bf2a8 | 3400 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
28736962 PA |
3401 | restore_child_signals_mask (&prev_mask); |
3402 | return minus_one_ptid; | |
3403 | } | |
d6b0e80f AC |
3404 | |
3405 | /* We shouldn't end up here unless we want to try again. */ | |
d90e17a7 | 3406 | gdb_assert (lp == NULL); |
0e5bf2a8 PA |
3407 | |
3408 | /* Block until we get an event reported with SIGCHLD. */ | |
d36bf488 DE |
3409 | if (debug_linux_nat) |
3410 | fprintf_unfiltered (gdb_stdlog, "LNW: about to sigsuspend\n"); | |
0e5bf2a8 | 3411 | sigsuspend (&suspend_mask); |
d6b0e80f AC |
3412 | } |
3413 | ||
d6b0e80f AC |
3414 | gdb_assert (lp); |
3415 | ||
ca2163eb PA |
3416 | status = lp->status; |
3417 | lp->status = 0; | |
3418 | ||
fbea99ea | 3419 | if (!target_is_non_stop_p ()) |
4c28f408 PA |
3420 | { |
3421 | /* Now stop all other LWP's ... */ | |
d90e17a7 | 3422 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); |
4c28f408 PA |
3423 | |
3424 | /* ... and wait until all of them have reported back that | |
3425 | they're no longer running. */ | |
d90e17a7 | 3426 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); |
9c02b525 PA |
3427 | } |
3428 | ||
3429 | /* If we're not waiting for a specific LWP, choose an event LWP from | |
3430 | among those that have had events. Giving equal priority to all | |
3431 | LWPs that have had events helps prevent starvation. */ | |
3432 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) | |
3433 | select_event_lwp (ptid, &lp, &status); | |
3434 | ||
3435 | gdb_assert (lp != NULL); | |
3436 | ||
3437 | /* Now that we've selected our final event LWP, un-adjust its PC if | |
faf09f01 PA |
3438 | it was a software breakpoint, and we can't reliably support the |
3439 | "stopped by software breakpoint" stop reason. */ | |
3440 | if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3441 | && !USE_SIGTRAP_SIGINFO) | |
9c02b525 PA |
3442 | { |
3443 | struct regcache *regcache = get_thread_regcache (lp->ptid); | |
ac7936df | 3444 | struct gdbarch *gdbarch = regcache->arch (); |
527a273a | 3445 | int decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
4c28f408 | 3446 | |
9c02b525 PA |
3447 | if (decr_pc != 0) |
3448 | { | |
3449 | CORE_ADDR pc; | |
d6b0e80f | 3450 | |
9c02b525 PA |
3451 | pc = regcache_read_pc (regcache); |
3452 | regcache_write_pc (regcache, pc + decr_pc); | |
3453 | } | |
3454 | } | |
e3e9f5a2 | 3455 | |
9c02b525 PA |
3456 | /* We'll need this to determine whether to report a SIGSTOP as |
3457 | GDB_SIGNAL_0. Need to take a copy because resume_clear_callback | |
3458 | clears it. */ | |
3459 | last_resume_kind = lp->last_resume_kind; | |
4b60df3d | 3460 | |
fbea99ea | 3461 | if (!target_is_non_stop_p ()) |
9c02b525 | 3462 | { |
e3e9f5a2 PA |
3463 | /* In all-stop, from the core's perspective, all LWPs are now |
3464 | stopped until a new resume action is sent over. */ | |
3465 | iterate_over_lwps (minus_one_ptid, resume_clear_callback, NULL); | |
3466 | } | |
3467 | else | |
25289eb2 | 3468 | { |
4b60df3d | 3469 | resume_clear_callback (lp, NULL); |
25289eb2 | 3470 | } |
d6b0e80f | 3471 | |
26ab7092 | 3472 | if (linux_nat_status_is_event (status)) |
d6b0e80f | 3473 | { |
d6b0e80f AC |
3474 | if (debug_linux_nat) |
3475 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
3476 | "LLW: trap ptid is %s.\n", |
3477 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 3478 | } |
d6b0e80f AC |
3479 | |
3480 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
3481 | { | |
3482 | *ourstatus = lp->waitstatus; | |
3483 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3484 | } | |
3485 | else | |
3486 | store_waitstatus (ourstatus, status); | |
3487 | ||
01124a23 | 3488 | if (debug_linux_nat) |
b84876c2 PA |
3489 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); |
3490 | ||
7feb7d06 | 3491 | restore_child_signals_mask (&prev_mask); |
1e225492 | 3492 | |
4b60df3d | 3493 | if (last_resume_kind == resume_stop |
25289eb2 PA |
3494 | && ourstatus->kind == TARGET_WAITKIND_STOPPED |
3495 | && WSTOPSIG (status) == SIGSTOP) | |
3496 | { | |
3497 | /* A thread that has been requested to stop by GDB with | |
3498 | target_stop, and it stopped cleanly, so report as SIG0. The | |
3499 | use of SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3500 | ourstatus->value.sig = GDB_SIGNAL_0; |
25289eb2 PA |
3501 | } |
3502 | ||
1e225492 JK |
3503 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
3504 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) | |
3505 | lp->core = -1; | |
3506 | else | |
2e794194 | 3507 | lp->core = linux_common_core_of_thread (lp->ptid); |
1e225492 | 3508 | |
aa01bd36 PA |
3509 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3510 | return filter_exit_event (lp, ourstatus); | |
3511 | ||
f973ed9c | 3512 | return lp->ptid; |
d6b0e80f AC |
3513 | } |
3514 | ||
e3e9f5a2 PA |
3515 | /* Resume LWPs that are currently stopped without any pending status |
3516 | to report, but are resumed from the core's perspective. */ | |
3517 | ||
3518 | static int | |
3519 | resume_stopped_resumed_lwps (struct lwp_info *lp, void *data) | |
3520 | { | |
9a3c8263 | 3521 | ptid_t *wait_ptid_p = (ptid_t *) data; |
e3e9f5a2 | 3522 | |
4dd63d48 PA |
3523 | if (!lp->stopped) |
3524 | { | |
3525 | if (debug_linux_nat) | |
3526 | fprintf_unfiltered (gdb_stdlog, | |
3527 | "RSRL: NOT resuming LWP %s, not stopped\n", | |
3528 | target_pid_to_str (lp->ptid)); | |
3529 | } | |
3530 | else if (!lp->resumed) | |
3531 | { | |
3532 | if (debug_linux_nat) | |
3533 | fprintf_unfiltered (gdb_stdlog, | |
3534 | "RSRL: NOT resuming LWP %s, not resumed\n", | |
3535 | target_pid_to_str (lp->ptid)); | |
3536 | } | |
3537 | else if (lwp_status_pending_p (lp)) | |
3538 | { | |
3539 | if (debug_linux_nat) | |
3540 | fprintf_unfiltered (gdb_stdlog, | |
3541 | "RSRL: NOT resuming LWP %s, has pending status\n", | |
3542 | target_pid_to_str (lp->ptid)); | |
3543 | } | |
3544 | else | |
e3e9f5a2 | 3545 | { |
336060f3 | 3546 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
ac7936df | 3547 | struct gdbarch *gdbarch = regcache->arch (); |
336060f3 | 3548 | |
23f238d3 | 3549 | TRY |
e3e9f5a2 | 3550 | { |
23f238d3 PA |
3551 | CORE_ADDR pc = regcache_read_pc (regcache); |
3552 | int leave_stopped = 0; | |
e3e9f5a2 | 3553 | |
23f238d3 PA |
3554 | /* Don't bother if there's a breakpoint at PC that we'd hit |
3555 | immediately, and we're not waiting for this LWP. */ | |
3556 | if (!ptid_match (lp->ptid, *wait_ptid_p)) | |
3557 | { | |
a01bda52 | 3558 | if (breakpoint_inserted_here_p (regcache->aspace (), pc)) |
23f238d3 PA |
3559 | leave_stopped = 1; |
3560 | } | |
e3e9f5a2 | 3561 | |
23f238d3 PA |
3562 | if (!leave_stopped) |
3563 | { | |
3564 | if (debug_linux_nat) | |
3565 | fprintf_unfiltered (gdb_stdlog, | |
3566 | "RSRL: resuming stopped-resumed LWP %s at " | |
3567 | "%s: step=%d\n", | |
3568 | target_pid_to_str (lp->ptid), | |
3569 | paddress (gdbarch, pc), | |
3570 | lp->step); | |
3571 | ||
3572 | linux_resume_one_lwp_throw (lp, lp->step, GDB_SIGNAL_0); | |
3573 | } | |
3574 | } | |
3575 | CATCH (ex, RETURN_MASK_ERROR) | |
3576 | { | |
3577 | if (!check_ptrace_stopped_lwp_gone (lp)) | |
3578 | throw_exception (ex); | |
3579 | } | |
3580 | END_CATCH | |
e3e9f5a2 PA |
3581 | } |
3582 | ||
3583 | return 0; | |
3584 | } | |
3585 | ||
7feb7d06 PA |
3586 | static ptid_t |
3587 | linux_nat_wait (struct target_ops *ops, | |
47608cb1 PA |
3588 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3589 | int target_options) | |
7feb7d06 PA |
3590 | { |
3591 | ptid_t event_ptid; | |
3592 | ||
3593 | if (debug_linux_nat) | |
09826ec5 PA |
3594 | { |
3595 | char *options_string; | |
3596 | ||
3597 | options_string = target_options_to_string (target_options); | |
3598 | fprintf_unfiltered (gdb_stdlog, | |
3599 | "linux_nat_wait: [%s], [%s]\n", | |
3600 | target_pid_to_str (ptid), | |
3601 | options_string); | |
3602 | xfree (options_string); | |
3603 | } | |
7feb7d06 PA |
3604 | |
3605 | /* Flush the async file first. */ | |
d9d41e78 | 3606 | if (target_is_async_p ()) |
7feb7d06 PA |
3607 | async_file_flush (); |
3608 | ||
e3e9f5a2 PA |
3609 | /* Resume LWPs that are currently stopped without any pending status |
3610 | to report, but are resumed from the core's perspective. LWPs get | |
3611 | in this state if we find them stopping at a time we're not | |
3612 | interested in reporting the event (target_wait on a | |
3613 | specific_process, for example, see linux_nat_wait_1), and | |
3614 | meanwhile the event became uninteresting. Don't bother resuming | |
3615 | LWPs we're not going to wait for if they'd stop immediately. */ | |
fbea99ea | 3616 | if (target_is_non_stop_p ()) |
e3e9f5a2 PA |
3617 | iterate_over_lwps (minus_one_ptid, resume_stopped_resumed_lwps, &ptid); |
3618 | ||
47608cb1 | 3619 | event_ptid = linux_nat_wait_1 (ops, ptid, ourstatus, target_options); |
7feb7d06 PA |
3620 | |
3621 | /* If we requested any event, and something came out, assume there | |
3622 | may be more. If we requested a specific lwp or process, also | |
3623 | assume there may be more. */ | |
d9d41e78 | 3624 | if (target_is_async_p () |
6953d224 PA |
3625 | && ((ourstatus->kind != TARGET_WAITKIND_IGNORE |
3626 | && ourstatus->kind != TARGET_WAITKIND_NO_RESUMED) | |
7feb7d06 PA |
3627 | || !ptid_equal (ptid, minus_one_ptid))) |
3628 | async_file_mark (); | |
3629 | ||
7feb7d06 PA |
3630 | return event_ptid; |
3631 | } | |
3632 | ||
1d2736d4 PA |
3633 | /* Kill one LWP. */ |
3634 | ||
3635 | static void | |
3636 | kill_one_lwp (pid_t pid) | |
d6b0e80f | 3637 | { |
ed731959 JK |
3638 | /* PTRACE_KILL may resume the inferior. Send SIGKILL first. */ |
3639 | ||
3640 | errno = 0; | |
1d2736d4 | 3641 | kill_lwp (pid, SIGKILL); |
ed731959 | 3642 | if (debug_linux_nat) |
57745c90 PA |
3643 | { |
3644 | int save_errno = errno; | |
3645 | ||
3646 | fprintf_unfiltered (gdb_stdlog, | |
1d2736d4 | 3647 | "KC: kill (SIGKILL) %ld, 0, 0 (%s)\n", (long) pid, |
57745c90 PA |
3648 | save_errno ? safe_strerror (save_errno) : "OK"); |
3649 | } | |
ed731959 JK |
3650 | |
3651 | /* Some kernels ignore even SIGKILL for processes under ptrace. */ | |
3652 | ||
d6b0e80f | 3653 | errno = 0; |
1d2736d4 | 3654 | ptrace (PTRACE_KILL, pid, 0, 0); |
d6b0e80f | 3655 | if (debug_linux_nat) |
57745c90 PA |
3656 | { |
3657 | int save_errno = errno; | |
3658 | ||
3659 | fprintf_unfiltered (gdb_stdlog, | |
1d2736d4 | 3660 | "KC: PTRACE_KILL %ld, 0, 0 (%s)\n", (long) pid, |
57745c90 PA |
3661 | save_errno ? safe_strerror (save_errno) : "OK"); |
3662 | } | |
d6b0e80f AC |
3663 | } |
3664 | ||
1d2736d4 PA |
3665 | /* Wait for an LWP to die. */ |
3666 | ||
3667 | static void | |
3668 | kill_wait_one_lwp (pid_t pid) | |
d6b0e80f | 3669 | { |
1d2736d4 | 3670 | pid_t res; |
d6b0e80f AC |
3671 | |
3672 | /* We must make sure that there are no pending events (delayed | |
3673 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
3674 | program doesn't interfere with any following debugging session. */ | |
3675 | ||
d6b0e80f AC |
3676 | do |
3677 | { | |
1d2736d4 PA |
3678 | res = my_waitpid (pid, NULL, __WALL); |
3679 | if (res != (pid_t) -1) | |
d6b0e80f | 3680 | { |
e85a822c DJ |
3681 | if (debug_linux_nat) |
3682 | fprintf_unfiltered (gdb_stdlog, | |
1d2736d4 PA |
3683 | "KWC: wait %ld received unknown.\n", |
3684 | (long) pid); | |
4a6ed09b PA |
3685 | /* The Linux kernel sometimes fails to kill a thread |
3686 | completely after PTRACE_KILL; that goes from the stop | |
3687 | point in do_fork out to the one in get_signal_to_deliver | |
3688 | and waits again. So kill it again. */ | |
1d2736d4 | 3689 | kill_one_lwp (pid); |
d6b0e80f AC |
3690 | } |
3691 | } | |
1d2736d4 PA |
3692 | while (res == pid); |
3693 | ||
3694 | gdb_assert (res == -1 && errno == ECHILD); | |
3695 | } | |
3696 | ||
3697 | /* Callback for iterate_over_lwps. */ | |
d6b0e80f | 3698 | |
1d2736d4 PA |
3699 | static int |
3700 | kill_callback (struct lwp_info *lp, void *data) | |
3701 | { | |
3702 | kill_one_lwp (ptid_get_lwp (lp->ptid)); | |
d6b0e80f AC |
3703 | return 0; |
3704 | } | |
3705 | ||
1d2736d4 PA |
3706 | /* Callback for iterate_over_lwps. */ |
3707 | ||
3708 | static int | |
3709 | kill_wait_callback (struct lwp_info *lp, void *data) | |
3710 | { | |
3711 | kill_wait_one_lwp (ptid_get_lwp (lp->ptid)); | |
3712 | return 0; | |
3713 | } | |
3714 | ||
3715 | /* Kill the fork children of any threads of inferior INF that are | |
3716 | stopped at a fork event. */ | |
3717 | ||
3718 | static void | |
3719 | kill_unfollowed_fork_children (struct inferior *inf) | |
3720 | { | |
3721 | struct thread_info *thread; | |
3722 | ||
3723 | ALL_NON_EXITED_THREADS (thread) | |
3724 | if (thread->inf == inf) | |
3725 | { | |
3726 | struct target_waitstatus *ws = &thread->pending_follow; | |
3727 | ||
3728 | if (ws->kind == TARGET_WAITKIND_FORKED | |
3729 | || ws->kind == TARGET_WAITKIND_VFORKED) | |
3730 | { | |
3731 | ptid_t child_ptid = ws->value.related_pid; | |
3732 | int child_pid = ptid_get_pid (child_ptid); | |
3733 | int child_lwp = ptid_get_lwp (child_ptid); | |
1d2736d4 PA |
3734 | |
3735 | kill_one_lwp (child_lwp); | |
3736 | kill_wait_one_lwp (child_lwp); | |
3737 | ||
3738 | /* Let the arch-specific native code know this process is | |
3739 | gone. */ | |
3740 | linux_nat_forget_process (child_pid); | |
3741 | } | |
3742 | } | |
3743 | } | |
3744 | ||
d6b0e80f | 3745 | static void |
7d85a9c0 | 3746 | linux_nat_kill (struct target_ops *ops) |
d6b0e80f | 3747 | { |
f973ed9c DJ |
3748 | /* If we're stopped while forking and we haven't followed yet, |
3749 | kill the other task. We need to do this first because the | |
3750 | parent will be sleeping if this is a vfork. */ | |
1d2736d4 | 3751 | kill_unfollowed_fork_children (current_inferior ()); |
f973ed9c DJ |
3752 | |
3753 | if (forks_exist_p ()) | |
7feb7d06 | 3754 | linux_fork_killall (); |
f973ed9c DJ |
3755 | else |
3756 | { | |
d90e17a7 | 3757 | ptid_t ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
e0881a8e | 3758 | |
4c28f408 PA |
3759 | /* Stop all threads before killing them, since ptrace requires |
3760 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
d90e17a7 | 3761 | iterate_over_lwps (ptid, stop_callback, NULL); |
4c28f408 PA |
3762 | /* ... and wait until all of them have reported back that |
3763 | they're no longer running. */ | |
d90e17a7 | 3764 | iterate_over_lwps (ptid, stop_wait_callback, NULL); |
4c28f408 | 3765 | |
f973ed9c | 3766 | /* Kill all LWP's ... */ |
d90e17a7 | 3767 | iterate_over_lwps (ptid, kill_callback, NULL); |
f973ed9c DJ |
3768 | |
3769 | /* ... and wait until we've flushed all events. */ | |
d90e17a7 | 3770 | iterate_over_lwps (ptid, kill_wait_callback, NULL); |
f973ed9c DJ |
3771 | } |
3772 | ||
bc1e6c81 | 3773 | target_mourn_inferior (inferior_ptid); |
d6b0e80f AC |
3774 | } |
3775 | ||
3776 | static void | |
136d6dae | 3777 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 3778 | { |
26cb8b7c PA |
3779 | int pid = ptid_get_pid (inferior_ptid); |
3780 | ||
3781 | purge_lwp_list (pid); | |
d6b0e80f | 3782 | |
f973ed9c | 3783 | if (! forks_exist_p ()) |
d90e17a7 PA |
3784 | /* Normal case, no other forks available. */ |
3785 | linux_ops->to_mourn_inferior (ops); | |
f973ed9c DJ |
3786 | else |
3787 | /* Multi-fork case. The current inferior_ptid has exited, but | |
3788 | there are other viable forks to debug. Delete the exiting | |
3789 | one and context-switch to the first available. */ | |
3790 | linux_fork_mourn_inferior (); | |
26cb8b7c PA |
3791 | |
3792 | /* Let the arch-specific native code know this process is gone. */ | |
3793 | linux_nat_forget_process (pid); | |
d6b0e80f AC |
3794 | } |
3795 | ||
5b009018 PA |
3796 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3797 | layout of the inferiors' architecture. */ | |
3798 | ||
3799 | static void | |
a5362b9a | 3800 | siginfo_fixup (siginfo_t *siginfo, gdb_byte *inf_siginfo, int direction) |
5b009018 PA |
3801 | { |
3802 | int done = 0; | |
3803 | ||
3804 | if (linux_nat_siginfo_fixup != NULL) | |
3805 | done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction); | |
3806 | ||
3807 | /* If there was no callback, or the callback didn't do anything, | |
3808 | then just do a straight memcpy. */ | |
3809 | if (!done) | |
3810 | { | |
3811 | if (direction == 1) | |
a5362b9a | 3812 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
5b009018 | 3813 | else |
a5362b9a | 3814 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
5b009018 PA |
3815 | } |
3816 | } | |
3817 | ||
9b409511 | 3818 | static enum target_xfer_status |
4aa995e1 PA |
3819 | linux_xfer_siginfo (struct target_ops *ops, enum target_object object, |
3820 | const char *annex, gdb_byte *readbuf, | |
9b409511 YQ |
3821 | const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, |
3822 | ULONGEST *xfered_len) | |
4aa995e1 | 3823 | { |
4aa995e1 | 3824 | int pid; |
a5362b9a TS |
3825 | siginfo_t siginfo; |
3826 | gdb_byte inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 PA |
3827 | |
3828 | gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO); | |
3829 | gdb_assert (readbuf || writebuf); | |
3830 | ||
dfd4cc63 | 3831 | pid = ptid_get_lwp (inferior_ptid); |
4aa995e1 | 3832 | if (pid == 0) |
dfd4cc63 | 3833 | pid = ptid_get_pid (inferior_ptid); |
4aa995e1 PA |
3834 | |
3835 | if (offset > sizeof (siginfo)) | |
2ed4b548 | 3836 | return TARGET_XFER_E_IO; |
4aa995e1 PA |
3837 | |
3838 | errno = 0; | |
3839 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3840 | if (errno != 0) | |
2ed4b548 | 3841 | return TARGET_XFER_E_IO; |
4aa995e1 | 3842 | |
5b009018 PA |
3843 | /* When GDB is built as a 64-bit application, ptrace writes into |
3844 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
3845 | inferior with a 64-bit GDB should look the same as debugging it | |
3846 | with a 32-bit GDB, we need to convert it. GDB core always sees | |
3847 | the converted layout, so any read/write will have to be done | |
3848 | post-conversion. */ | |
3849 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
3850 | ||
4aa995e1 PA |
3851 | if (offset + len > sizeof (siginfo)) |
3852 | len = sizeof (siginfo) - offset; | |
3853 | ||
3854 | if (readbuf != NULL) | |
5b009018 | 3855 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
3856 | else |
3857 | { | |
5b009018 PA |
3858 | memcpy (inf_siginfo + offset, writebuf, len); |
3859 | ||
3860 | /* Convert back to ptrace layout before flushing it out. */ | |
3861 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
3862 | ||
4aa995e1 PA |
3863 | errno = 0; |
3864 | ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3865 | if (errno != 0) | |
2ed4b548 | 3866 | return TARGET_XFER_E_IO; |
4aa995e1 PA |
3867 | } |
3868 | ||
9b409511 YQ |
3869 | *xfered_len = len; |
3870 | return TARGET_XFER_OK; | |
4aa995e1 PA |
3871 | } |
3872 | ||
9b409511 | 3873 | static enum target_xfer_status |
10d6c8cd DJ |
3874 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, |
3875 | const char *annex, gdb_byte *readbuf, | |
3876 | const gdb_byte *writebuf, | |
9b409511 | 3877 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
d6b0e80f | 3878 | { |
9b409511 | 3879 | enum target_xfer_status xfer; |
d6b0e80f | 3880 | |
4aa995e1 PA |
3881 | if (object == TARGET_OBJECT_SIGNAL_INFO) |
3882 | return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf, | |
9b409511 | 3883 | offset, len, xfered_len); |
4aa995e1 | 3884 | |
c35b1492 PA |
3885 | /* The target is connected but no live inferior is selected. Pass |
3886 | this request down to a lower stratum (e.g., the executable | |
3887 | file). */ | |
3888 | if (object == TARGET_OBJECT_MEMORY && ptid_equal (inferior_ptid, null_ptid)) | |
9b409511 | 3889 | return TARGET_XFER_EOF; |
c35b1492 | 3890 | |
10d6c8cd | 3891 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
9b409511 | 3892 | offset, len, xfered_len); |
d6b0e80f | 3893 | |
d6b0e80f AC |
3894 | return xfer; |
3895 | } | |
3896 | ||
28439f5e PA |
3897 | static int |
3898 | linux_nat_thread_alive (struct target_ops *ops, ptid_t ptid) | |
3899 | { | |
4a6ed09b PA |
3900 | /* As long as a PTID is in lwp list, consider it alive. */ |
3901 | return find_lwp_pid (ptid) != NULL; | |
28439f5e PA |
3902 | } |
3903 | ||
8a06aea7 PA |
3904 | /* Implement the to_update_thread_list target method for this |
3905 | target. */ | |
3906 | ||
3907 | static void | |
3908 | linux_nat_update_thread_list (struct target_ops *ops) | |
3909 | { | |
a6904d5a PA |
3910 | struct lwp_info *lwp; |
3911 | ||
4a6ed09b PA |
3912 | /* We add/delete threads from the list as clone/exit events are |
3913 | processed, so just try deleting exited threads still in the | |
3914 | thread list. */ | |
3915 | delete_exited_threads (); | |
a6904d5a PA |
3916 | |
3917 | /* Update the processor core that each lwp/thread was last seen | |
3918 | running on. */ | |
3919 | ALL_LWPS (lwp) | |
1ad3de98 PA |
3920 | { |
3921 | /* Avoid accessing /proc if the thread hasn't run since we last | |
3922 | time we fetched the thread's core. Accessing /proc becomes | |
3923 | noticeably expensive when we have thousands of LWPs. */ | |
3924 | if (lwp->core == -1) | |
3925 | lwp->core = linux_common_core_of_thread (lwp->ptid); | |
3926 | } | |
8a06aea7 PA |
3927 | } |
3928 | ||
7a114964 | 3929 | static const char * |
117de6a9 | 3930 | linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid) |
d6b0e80f AC |
3931 | { |
3932 | static char buf[64]; | |
3933 | ||
dfd4cc63 LM |
3934 | if (ptid_lwp_p (ptid) |
3935 | && (ptid_get_pid (ptid) != ptid_get_lwp (ptid) | |
3936 | || num_lwps (ptid_get_pid (ptid)) > 1)) | |
d6b0e80f | 3937 | { |
dfd4cc63 | 3938 | snprintf (buf, sizeof (buf), "LWP %ld", ptid_get_lwp (ptid)); |
d6b0e80f AC |
3939 | return buf; |
3940 | } | |
3941 | ||
3942 | return normal_pid_to_str (ptid); | |
3943 | } | |
3944 | ||
73ede765 | 3945 | static const char * |
503a628d | 3946 | linux_nat_thread_name (struct target_ops *self, struct thread_info *thr) |
4694da01 | 3947 | { |
79efa585 | 3948 | return linux_proc_tid_get_name (thr->ptid); |
4694da01 TT |
3949 | } |
3950 | ||
dba24537 AC |
3951 | /* Accepts an integer PID; Returns a string representing a file that |
3952 | can be opened to get the symbols for the child process. */ | |
3953 | ||
6d8fd2b7 | 3954 | static char * |
8dd27370 | 3955 | linux_child_pid_to_exec_file (struct target_ops *self, int pid) |
dba24537 | 3956 | { |
e0d86d2c | 3957 | return linux_proc_pid_to_exec_file (pid); |
dba24537 AC |
3958 | } |
3959 | ||
a379284a AA |
3960 | /* Implement the to_xfer_partial target method using /proc/<pid>/mem. |
3961 | Because we can use a single read/write call, this can be much more | |
3962 | efficient than banging away at PTRACE_PEEKTEXT. */ | |
10d6c8cd | 3963 | |
9b409511 | 3964 | static enum target_xfer_status |
10d6c8cd DJ |
3965 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, |
3966 | const char *annex, gdb_byte *readbuf, | |
3967 | const gdb_byte *writebuf, | |
9b409511 | 3968 | ULONGEST offset, LONGEST len, ULONGEST *xfered_len) |
dba24537 | 3969 | { |
10d6c8cd DJ |
3970 | LONGEST ret; |
3971 | int fd; | |
dba24537 AC |
3972 | char filename[64]; |
3973 | ||
a379284a | 3974 | if (object != TARGET_OBJECT_MEMORY) |
f486487f | 3975 | return TARGET_XFER_EOF; |
dba24537 AC |
3976 | |
3977 | /* Don't bother for one word. */ | |
3978 | if (len < 3 * sizeof (long)) | |
9b409511 | 3979 | return TARGET_XFER_EOF; |
dba24537 AC |
3980 | |
3981 | /* We could keep this file open and cache it - possibly one per | |
3982 | thread. That requires some juggling, but is even faster. */ | |
b67aeab0 SM |
3983 | xsnprintf (filename, sizeof filename, "/proc/%ld/mem", |
3984 | ptid_get_lwp (inferior_ptid)); | |
a379284a AA |
3985 | fd = gdb_open_cloexec (filename, ((readbuf ? O_RDONLY : O_WRONLY) |
3986 | | O_LARGEFILE), 0); | |
dba24537 | 3987 | if (fd == -1) |
9b409511 | 3988 | return TARGET_XFER_EOF; |
dba24537 | 3989 | |
a379284a AA |
3990 | /* Use pread64/pwrite64 if available, since they save a syscall and can |
3991 | handle 64-bit offsets even on 32-bit platforms (for instance, SPARC | |
3992 | debugging a SPARC64 application). */ | |
dba24537 | 3993 | #ifdef HAVE_PREAD64 |
a379284a AA |
3994 | ret = (readbuf ? pread64 (fd, readbuf, len, offset) |
3995 | : pwrite64 (fd, writebuf, len, offset)); | |
dba24537 | 3996 | #else |
a379284a AA |
3997 | ret = lseek (fd, offset, SEEK_SET); |
3998 | if (ret != -1) | |
3999 | ret = (readbuf ? read (fd, readbuf, len) | |
4000 | : write (fd, writebuf, len)); | |
dba24537 | 4001 | #endif |
dba24537 AC |
4002 | |
4003 | close (fd); | |
9b409511 | 4004 | |
a379284a | 4005 | if (ret == -1 || ret == 0) |
9b409511 YQ |
4006 | return TARGET_XFER_EOF; |
4007 | else | |
4008 | { | |
4009 | *xfered_len = ret; | |
4010 | return TARGET_XFER_OK; | |
4011 | } | |
dba24537 AC |
4012 | } |
4013 | ||
efcbbd14 UW |
4014 | |
4015 | /* Enumerate spufs IDs for process PID. */ | |
4016 | static LONGEST | |
b55e14c7 | 4017 | spu_enumerate_spu_ids (int pid, gdb_byte *buf, ULONGEST offset, ULONGEST len) |
efcbbd14 | 4018 | { |
f5656ead | 4019 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
efcbbd14 UW |
4020 | LONGEST pos = 0; |
4021 | LONGEST written = 0; | |
4022 | char path[128]; | |
4023 | DIR *dir; | |
4024 | struct dirent *entry; | |
4025 | ||
4026 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4027 | dir = opendir (path); | |
4028 | if (!dir) | |
4029 | return -1; | |
4030 | ||
4031 | rewinddir (dir); | |
4032 | while ((entry = readdir (dir)) != NULL) | |
4033 | { | |
4034 | struct stat st; | |
4035 | struct statfs stfs; | |
4036 | int fd; | |
4037 | ||
4038 | fd = atoi (entry->d_name); | |
4039 | if (!fd) | |
4040 | continue; | |
4041 | ||
4042 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4043 | if (stat (path, &st) != 0) | |
4044 | continue; | |
4045 | if (!S_ISDIR (st.st_mode)) | |
4046 | continue; | |
4047 | ||
4048 | if (statfs (path, &stfs) != 0) | |
4049 | continue; | |
4050 | if (stfs.f_type != SPUFS_MAGIC) | |
4051 | continue; | |
4052 | ||
4053 | if (pos >= offset && pos + 4 <= offset + len) | |
4054 | { | |
4055 | store_unsigned_integer (buf + pos - offset, 4, byte_order, fd); | |
4056 | written += 4; | |
4057 | } | |
4058 | pos += 4; | |
4059 | } | |
4060 | ||
4061 | closedir (dir); | |
4062 | return written; | |
4063 | } | |
4064 | ||
4065 | /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4066 | object type, using the /proc file system. */ | |
9b409511 YQ |
4067 | |
4068 | static enum target_xfer_status | |
efcbbd14 UW |
4069 | linux_proc_xfer_spu (struct target_ops *ops, enum target_object object, |
4070 | const char *annex, gdb_byte *readbuf, | |
4071 | const gdb_byte *writebuf, | |
9b409511 | 4072 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
efcbbd14 UW |
4073 | { |
4074 | char buf[128]; | |
4075 | int fd = 0; | |
4076 | int ret = -1; | |
b67aeab0 | 4077 | int pid = ptid_get_lwp (inferior_ptid); |
efcbbd14 UW |
4078 | |
4079 | if (!annex) | |
4080 | { | |
4081 | if (!readbuf) | |
2ed4b548 | 4082 | return TARGET_XFER_E_IO; |
efcbbd14 | 4083 | else |
9b409511 YQ |
4084 | { |
4085 | LONGEST l = spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4086 | ||
4087 | if (l < 0) | |
4088 | return TARGET_XFER_E_IO; | |
4089 | else if (l == 0) | |
4090 | return TARGET_XFER_EOF; | |
4091 | else | |
4092 | { | |
4093 | *xfered_len = (ULONGEST) l; | |
4094 | return TARGET_XFER_OK; | |
4095 | } | |
4096 | } | |
efcbbd14 UW |
4097 | } |
4098 | ||
4099 | xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex); | |
614c279d | 4100 | fd = gdb_open_cloexec (buf, writebuf? O_WRONLY : O_RDONLY, 0); |
efcbbd14 | 4101 | if (fd <= 0) |
2ed4b548 | 4102 | return TARGET_XFER_E_IO; |
efcbbd14 UW |
4103 | |
4104 | if (offset != 0 | |
4105 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4106 | { | |
4107 | close (fd); | |
9b409511 | 4108 | return TARGET_XFER_EOF; |
efcbbd14 UW |
4109 | } |
4110 | ||
4111 | if (writebuf) | |
4112 | ret = write (fd, writebuf, (size_t) len); | |
4113 | else if (readbuf) | |
4114 | ret = read (fd, readbuf, (size_t) len); | |
4115 | ||
4116 | close (fd); | |
9b409511 YQ |
4117 | |
4118 | if (ret < 0) | |
4119 | return TARGET_XFER_E_IO; | |
4120 | else if (ret == 0) | |
4121 | return TARGET_XFER_EOF; | |
4122 | else | |
4123 | { | |
4124 | *xfered_len = (ULONGEST) ret; | |
4125 | return TARGET_XFER_OK; | |
4126 | } | |
efcbbd14 UW |
4127 | } |
4128 | ||
4129 | ||
dba24537 AC |
4130 | /* Parse LINE as a signal set and add its set bits to SIGS. */ |
4131 | ||
4132 | static void | |
4133 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
4134 | { | |
4135 | int len = strlen (line) - 1; | |
4136 | const char *p; | |
4137 | int signum; | |
4138 | ||
4139 | if (line[len] != '\n') | |
8a3fe4f8 | 4140 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4141 | |
4142 | p = line; | |
4143 | signum = len * 4; | |
4144 | while (len-- > 0) | |
4145 | { | |
4146 | int digit; | |
4147 | ||
4148 | if (*p >= '0' && *p <= '9') | |
4149 | digit = *p - '0'; | |
4150 | else if (*p >= 'a' && *p <= 'f') | |
4151 | digit = *p - 'a' + 10; | |
4152 | else | |
8a3fe4f8 | 4153 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4154 | |
4155 | signum -= 4; | |
4156 | ||
4157 | if (digit & 1) | |
4158 | sigaddset (sigs, signum + 1); | |
4159 | if (digit & 2) | |
4160 | sigaddset (sigs, signum + 2); | |
4161 | if (digit & 4) | |
4162 | sigaddset (sigs, signum + 3); | |
4163 | if (digit & 8) | |
4164 | sigaddset (sigs, signum + 4); | |
4165 | ||
4166 | p++; | |
4167 | } | |
4168 | } | |
4169 | ||
4170 | /* Find process PID's pending signals from /proc/pid/status and set | |
4171 | SIGS to match. */ | |
4172 | ||
4173 | void | |
3e43a32a MS |
4174 | linux_proc_pending_signals (int pid, sigset_t *pending, |
4175 | sigset_t *blocked, sigset_t *ignored) | |
dba24537 | 4176 | { |
d8d2a3ee | 4177 | char buffer[PATH_MAX], fname[PATH_MAX]; |
dba24537 AC |
4178 | |
4179 | sigemptyset (pending); | |
4180 | sigemptyset (blocked); | |
4181 | sigemptyset (ignored); | |
cde33bf1 | 4182 | xsnprintf (fname, sizeof fname, "/proc/%d/status", pid); |
d419f42d | 4183 | gdb_file_up procfile = gdb_fopen_cloexec (fname, "r"); |
dba24537 | 4184 | if (procfile == NULL) |
8a3fe4f8 | 4185 | error (_("Could not open %s"), fname); |
dba24537 | 4186 | |
d419f42d | 4187 | while (fgets (buffer, PATH_MAX, procfile.get ()) != NULL) |
dba24537 AC |
4188 | { |
4189 | /* Normal queued signals are on the SigPnd line in the status | |
4190 | file. However, 2.6 kernels also have a "shared" pending | |
4191 | queue for delivering signals to a thread group, so check for | |
4192 | a ShdPnd line also. | |
4193 | ||
4194 | Unfortunately some Red Hat kernels include the shared pending | |
4195 | queue but not the ShdPnd status field. */ | |
4196 | ||
61012eef | 4197 | if (startswith (buffer, "SigPnd:\t")) |
dba24537 | 4198 | add_line_to_sigset (buffer + 8, pending); |
61012eef | 4199 | else if (startswith (buffer, "ShdPnd:\t")) |
dba24537 | 4200 | add_line_to_sigset (buffer + 8, pending); |
61012eef | 4201 | else if (startswith (buffer, "SigBlk:\t")) |
dba24537 | 4202 | add_line_to_sigset (buffer + 8, blocked); |
61012eef | 4203 | else if (startswith (buffer, "SigIgn:\t")) |
dba24537 AC |
4204 | add_line_to_sigset (buffer + 8, ignored); |
4205 | } | |
dba24537 AC |
4206 | } |
4207 | ||
9b409511 | 4208 | static enum target_xfer_status |
07e059b5 | 4209 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, |
e0881a8e | 4210 | const char *annex, gdb_byte *readbuf, |
9b409511 YQ |
4211 | const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, |
4212 | ULONGEST *xfered_len) | |
07e059b5 | 4213 | { |
07e059b5 VP |
4214 | gdb_assert (object == TARGET_OBJECT_OSDATA); |
4215 | ||
9b409511 YQ |
4216 | *xfered_len = linux_common_xfer_osdata (annex, readbuf, offset, len); |
4217 | if (*xfered_len == 0) | |
4218 | return TARGET_XFER_EOF; | |
4219 | else | |
4220 | return TARGET_XFER_OK; | |
07e059b5 VP |
4221 | } |
4222 | ||
9b409511 | 4223 | static enum target_xfer_status |
10d6c8cd DJ |
4224 | linux_xfer_partial (struct target_ops *ops, enum target_object object, |
4225 | const char *annex, gdb_byte *readbuf, | |
9b409511 YQ |
4226 | const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, |
4227 | ULONGEST *xfered_len) | |
10d6c8cd | 4228 | { |
9b409511 | 4229 | enum target_xfer_status xfer; |
10d6c8cd DJ |
4230 | |
4231 | if (object == TARGET_OBJECT_AUXV) | |
9f2982ff | 4232 | return memory_xfer_auxv (ops, object, annex, readbuf, writebuf, |
9b409511 | 4233 | offset, len, xfered_len); |
10d6c8cd | 4234 | |
07e059b5 VP |
4235 | if (object == TARGET_OBJECT_OSDATA) |
4236 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
9b409511 | 4237 | offset, len, xfered_len); |
07e059b5 | 4238 | |
efcbbd14 UW |
4239 | if (object == TARGET_OBJECT_SPU) |
4240 | return linux_proc_xfer_spu (ops, object, annex, readbuf, writebuf, | |
9b409511 | 4241 | offset, len, xfered_len); |
efcbbd14 | 4242 | |
8f313923 JK |
4243 | /* GDB calculates all the addresses in possibly larget width of the address. |
4244 | Address width needs to be masked before its final use - either by | |
4245 | linux_proc_xfer_partial or inf_ptrace_xfer_partial. | |
4246 | ||
4247 | Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */ | |
4248 | ||
4249 | if (object == TARGET_OBJECT_MEMORY) | |
4250 | { | |
f5656ead | 4251 | int addr_bit = gdbarch_addr_bit (target_gdbarch ()); |
8f313923 JK |
4252 | |
4253 | if (addr_bit < (sizeof (ULONGEST) * HOST_CHAR_BIT)) | |
4254 | offset &= ((ULONGEST) 1 << addr_bit) - 1; | |
4255 | } | |
4256 | ||
10d6c8cd | 4257 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
9b409511 YQ |
4258 | offset, len, xfered_len); |
4259 | if (xfer != TARGET_XFER_EOF) | |
10d6c8cd DJ |
4260 | return xfer; |
4261 | ||
4262 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
9b409511 | 4263 | offset, len, xfered_len); |
10d6c8cd DJ |
4264 | } |
4265 | ||
5808517f YQ |
4266 | static void |
4267 | cleanup_target_stop (void *arg) | |
4268 | { | |
4269 | ptid_t *ptid = (ptid_t *) arg; | |
4270 | ||
4271 | gdb_assert (arg != NULL); | |
4272 | ||
4273 | /* Unpause all */ | |
049a8570 | 4274 | target_continue_no_signal (*ptid); |
5808517f YQ |
4275 | } |
4276 | ||
4277 | static VEC(static_tracepoint_marker_p) * | |
c686c57f TT |
4278 | linux_child_static_tracepoint_markers_by_strid (struct target_ops *self, |
4279 | const char *strid) | |
5808517f YQ |
4280 | { |
4281 | char s[IPA_CMD_BUF_SIZE]; | |
4282 | struct cleanup *old_chain; | |
4283 | int pid = ptid_get_pid (inferior_ptid); | |
4284 | VEC(static_tracepoint_marker_p) *markers = NULL; | |
4285 | struct static_tracepoint_marker *marker = NULL; | |
256642e8 | 4286 | const char *p = s; |
5808517f YQ |
4287 | ptid_t ptid = ptid_build (pid, 0, 0); |
4288 | ||
4289 | /* Pause all */ | |
4290 | target_stop (ptid); | |
4291 | ||
4292 | memcpy (s, "qTfSTM", sizeof ("qTfSTM")); | |
4293 | s[sizeof ("qTfSTM")] = 0; | |
4294 | ||
42476b70 | 4295 | agent_run_command (pid, s, strlen (s) + 1); |
5808517f YQ |
4296 | |
4297 | old_chain = make_cleanup (free_current_marker, &marker); | |
4298 | make_cleanup (cleanup_target_stop, &ptid); | |
4299 | ||
4300 | while (*p++ == 'm') | |
4301 | { | |
4302 | if (marker == NULL) | |
4303 | marker = XCNEW (struct static_tracepoint_marker); | |
4304 | ||
4305 | do | |
4306 | { | |
4307 | parse_static_tracepoint_marker_definition (p, &p, marker); | |
4308 | ||
4309 | if (strid == NULL || strcmp (strid, marker->str_id) == 0) | |
4310 | { | |
4311 | VEC_safe_push (static_tracepoint_marker_p, | |
4312 | markers, marker); | |
4313 | marker = NULL; | |
4314 | } | |
4315 | else | |
4316 | { | |
4317 | release_static_tracepoint_marker (marker); | |
4318 | memset (marker, 0, sizeof (*marker)); | |
4319 | } | |
4320 | } | |
4321 | while (*p++ == ','); /* comma-separated list */ | |
4322 | ||
4323 | memcpy (s, "qTsSTM", sizeof ("qTsSTM")); | |
4324 | s[sizeof ("qTsSTM")] = 0; | |
42476b70 | 4325 | agent_run_command (pid, s, strlen (s) + 1); |
5808517f YQ |
4326 | p = s; |
4327 | } | |
4328 | ||
4329 | do_cleanups (old_chain); | |
4330 | ||
4331 | return markers; | |
4332 | } | |
4333 | ||
e9efe249 | 4334 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
4335 | it with local methods. */ |
4336 | ||
910122bf UW |
4337 | static void |
4338 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 4339 | { |
6d8fd2b7 | 4340 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
eb73ad13 | 4341 | t->to_remove_fork_catchpoint = linux_child_remove_fork_catchpoint; |
6d8fd2b7 | 4342 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; |
eb73ad13 | 4343 | t->to_remove_vfork_catchpoint = linux_child_remove_vfork_catchpoint; |
6d8fd2b7 | 4344 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; |
eb73ad13 | 4345 | t->to_remove_exec_catchpoint = linux_child_remove_exec_catchpoint; |
a96d9b2e | 4346 | t->to_set_syscall_catchpoint = linux_child_set_syscall_catchpoint; |
6d8fd2b7 | 4347 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; |
10d6c8cd | 4348 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
4349 | t->to_post_attach = linux_child_post_attach; |
4350 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
4351 | |
4352 | super_xfer_partial = t->to_xfer_partial; | |
4353 | t->to_xfer_partial = linux_xfer_partial; | |
5808517f YQ |
4354 | |
4355 | t->to_static_tracepoint_markers_by_strid | |
4356 | = linux_child_static_tracepoint_markers_by_strid; | |
910122bf UW |
4357 | } |
4358 | ||
4359 | struct target_ops * | |
4360 | linux_target (void) | |
4361 | { | |
4362 | struct target_ops *t; | |
4363 | ||
4364 | t = inf_ptrace_target (); | |
4365 | linux_target_install_ops (t); | |
4366 | ||
4367 | return t; | |
4368 | } | |
4369 | ||
4370 | struct target_ops * | |
7714d83a | 4371 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
4372 | { |
4373 | struct target_ops *t; | |
4374 | ||
4375 | t = inf_ptrace_trad_target (register_u_offset); | |
4376 | linux_target_install_ops (t); | |
10d6c8cd | 4377 | |
10d6c8cd DJ |
4378 | return t; |
4379 | } | |
4380 | ||
b84876c2 PA |
4381 | /* target_is_async_p implementation. */ |
4382 | ||
4383 | static int | |
6a109b6b | 4384 | linux_nat_is_async_p (struct target_ops *ops) |
b84876c2 | 4385 | { |
198297aa | 4386 | return linux_is_async_p (); |
b84876c2 PA |
4387 | } |
4388 | ||
4389 | /* target_can_async_p implementation. */ | |
4390 | ||
4391 | static int | |
6a109b6b | 4392 | linux_nat_can_async_p (struct target_ops *ops) |
b84876c2 | 4393 | { |
fde1b17d SM |
4394 | /* We're always async, unless the user explicitly prevented it with the |
4395 | "maint set target-async" command. */ | |
3dd5b83d | 4396 | return target_async_permitted; |
b84876c2 PA |
4397 | } |
4398 | ||
9908b566 | 4399 | static int |
2a9a2795 | 4400 | linux_nat_supports_non_stop (struct target_ops *self) |
9908b566 VP |
4401 | { |
4402 | return 1; | |
4403 | } | |
4404 | ||
fbea99ea PA |
4405 | /* to_always_non_stop_p implementation. */ |
4406 | ||
4407 | static int | |
4408 | linux_nat_always_non_stop_p (struct target_ops *self) | |
4409 | { | |
f12899e9 | 4410 | return 1; |
fbea99ea PA |
4411 | } |
4412 | ||
d90e17a7 PA |
4413 | /* True if we want to support multi-process. To be removed when GDB |
4414 | supports multi-exec. */ | |
4415 | ||
2277426b | 4416 | int linux_multi_process = 1; |
d90e17a7 PA |
4417 | |
4418 | static int | |
86ce2668 | 4419 | linux_nat_supports_multi_process (struct target_ops *self) |
d90e17a7 PA |
4420 | { |
4421 | return linux_multi_process; | |
4422 | } | |
4423 | ||
03583c20 | 4424 | static int |
2bfc0540 | 4425 | linux_nat_supports_disable_randomization (struct target_ops *self) |
03583c20 UW |
4426 | { |
4427 | #ifdef HAVE_PERSONALITY | |
4428 | return 1; | |
4429 | #else | |
4430 | return 0; | |
4431 | #endif | |
4432 | } | |
4433 | ||
b84876c2 PA |
4434 | static int async_terminal_is_ours = 1; |
4435 | ||
4d4ca2a1 DE |
4436 | /* target_terminal_inferior implementation. |
4437 | ||
4438 | This is a wrapper around child_terminal_inferior to add async support. */ | |
b84876c2 PA |
4439 | |
4440 | static void | |
d2f640d4 | 4441 | linux_nat_terminal_inferior (struct target_ops *self) |
b84876c2 | 4442 | { |
d6b64346 | 4443 | child_terminal_inferior (self); |
b84876c2 | 4444 | |
d9d2d8b6 | 4445 | /* Calls to target_terminal_*() are meant to be idempotent. */ |
b84876c2 PA |
4446 | if (!async_terminal_is_ours) |
4447 | return; | |
4448 | ||
b84876c2 PA |
4449 | async_terminal_is_ours = 0; |
4450 | set_sigint_trap (); | |
4451 | } | |
4452 | ||
223ffa71 | 4453 | /* target_terminal::ours implementation. |
4d4ca2a1 DE |
4454 | |
4455 | This is a wrapper around child_terminal_ours to add async support (and | |
223ffa71 | 4456 | implement the target_terminal::ours vs target_terminal::ours_for_output |
4d4ca2a1 DE |
4457 | distinction). child_terminal_ours is currently no different than |
4458 | child_terminal_ours_for_output. | |
223ffa71 | 4459 | We leave target_terminal::ours_for_output alone, leaving it to |
4d4ca2a1 | 4460 | child_terminal_ours_for_output. */ |
b84876c2 | 4461 | |
2c0b251b | 4462 | static void |
e3594fd1 | 4463 | linux_nat_terminal_ours (struct target_ops *self) |
b84876c2 | 4464 | { |
b84876c2 PA |
4465 | /* GDB should never give the terminal to the inferior if the |
4466 | inferior is running in the background (run&, continue&, etc.), | |
4467 | but claiming it sure should. */ | |
d6b64346 | 4468 | child_terminal_ours (self); |
b84876c2 | 4469 | |
b84876c2 PA |
4470 | if (async_terminal_is_ours) |
4471 | return; | |
4472 | ||
4473 | clear_sigint_trap (); | |
b84876c2 PA |
4474 | async_terminal_is_ours = 1; |
4475 | } | |
4476 | ||
7feb7d06 PA |
4477 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4478 | so we notice when any child changes state, and notify the | |
4479 | event-loop; it allows us to use sigsuspend in linux_nat_wait_1 | |
4480 | above to wait for the arrival of a SIGCHLD. */ | |
4481 | ||
b84876c2 | 4482 | static void |
7feb7d06 | 4483 | sigchld_handler (int signo) |
b84876c2 | 4484 | { |
7feb7d06 PA |
4485 | int old_errno = errno; |
4486 | ||
01124a23 DE |
4487 | if (debug_linux_nat) |
4488 | ui_file_write_async_safe (gdb_stdlog, | |
4489 | "sigchld\n", sizeof ("sigchld\n") - 1); | |
7feb7d06 PA |
4490 | |
4491 | if (signo == SIGCHLD | |
4492 | && linux_nat_event_pipe[0] != -1) | |
4493 | async_file_mark (); /* Let the event loop know that there are | |
4494 | events to handle. */ | |
4495 | ||
4496 | errno = old_errno; | |
4497 | } | |
4498 | ||
4499 | /* Callback registered with the target events file descriptor. */ | |
4500 | ||
4501 | static void | |
4502 | handle_target_event (int error, gdb_client_data client_data) | |
4503 | { | |
6a3753b3 | 4504 | inferior_event_handler (INF_REG_EVENT, NULL); |
7feb7d06 PA |
4505 | } |
4506 | ||
4507 | /* Create/destroy the target events pipe. Returns previous state. */ | |
4508 | ||
4509 | static int | |
4510 | linux_async_pipe (int enable) | |
4511 | { | |
198297aa | 4512 | int previous = linux_is_async_p (); |
7feb7d06 PA |
4513 | |
4514 | if (previous != enable) | |
4515 | { | |
4516 | sigset_t prev_mask; | |
4517 | ||
12696c10 PA |
4518 | /* Block child signals while we create/destroy the pipe, as |
4519 | their handler writes to it. */ | |
7feb7d06 PA |
4520 | block_child_signals (&prev_mask); |
4521 | ||
4522 | if (enable) | |
4523 | { | |
614c279d | 4524 | if (gdb_pipe_cloexec (linux_nat_event_pipe) == -1) |
7feb7d06 PA |
4525 | internal_error (__FILE__, __LINE__, |
4526 | "creating event pipe failed."); | |
4527 | ||
4528 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4529 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4530 | } | |
4531 | else | |
4532 | { | |
4533 | close (linux_nat_event_pipe[0]); | |
4534 | close (linux_nat_event_pipe[1]); | |
4535 | linux_nat_event_pipe[0] = -1; | |
4536 | linux_nat_event_pipe[1] = -1; | |
4537 | } | |
4538 | ||
4539 | restore_child_signals_mask (&prev_mask); | |
4540 | } | |
4541 | ||
4542 | return previous; | |
b84876c2 PA |
4543 | } |
4544 | ||
4545 | /* target_async implementation. */ | |
4546 | ||
4547 | static void | |
6a3753b3 | 4548 | linux_nat_async (struct target_ops *ops, int enable) |
b84876c2 | 4549 | { |
6a3753b3 | 4550 | if (enable) |
b84876c2 | 4551 | { |
7feb7d06 PA |
4552 | if (!linux_async_pipe (1)) |
4553 | { | |
4554 | add_file_handler (linux_nat_event_pipe[0], | |
4555 | handle_target_event, NULL); | |
4556 | /* There may be pending events to handle. Tell the event loop | |
4557 | to poll them. */ | |
4558 | async_file_mark (); | |
4559 | } | |
b84876c2 PA |
4560 | } |
4561 | else | |
4562 | { | |
b84876c2 | 4563 | delete_file_handler (linux_nat_event_pipe[0]); |
7feb7d06 | 4564 | linux_async_pipe (0); |
b84876c2 PA |
4565 | } |
4566 | return; | |
4567 | } | |
4568 | ||
a493e3e2 | 4569 | /* Stop an LWP, and push a GDB_SIGNAL_0 stop status if no other |
252fbfc8 PA |
4570 | event came out. */ |
4571 | ||
4c28f408 | 4572 | static int |
252fbfc8 | 4573 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 4574 | { |
d90e17a7 | 4575 | if (!lwp->stopped) |
252fbfc8 | 4576 | { |
d90e17a7 PA |
4577 | if (debug_linux_nat) |
4578 | fprintf_unfiltered (gdb_stdlog, | |
4579 | "LNSL: running -> suspending %s\n", | |
4580 | target_pid_to_str (lwp->ptid)); | |
252fbfc8 | 4581 | |
252fbfc8 | 4582 | |
25289eb2 PA |
4583 | if (lwp->last_resume_kind == resume_stop) |
4584 | { | |
4585 | if (debug_linux_nat) | |
4586 | fprintf_unfiltered (gdb_stdlog, | |
4587 | "linux-nat: already stopping LWP %ld at " | |
4588 | "GDB's request\n", | |
4589 | ptid_get_lwp (lwp->ptid)); | |
4590 | return 0; | |
4591 | } | |
252fbfc8 | 4592 | |
25289eb2 PA |
4593 | stop_callback (lwp, NULL); |
4594 | lwp->last_resume_kind = resume_stop; | |
d90e17a7 PA |
4595 | } |
4596 | else | |
4597 | { | |
4598 | /* Already known to be stopped; do nothing. */ | |
252fbfc8 | 4599 | |
d90e17a7 PA |
4600 | if (debug_linux_nat) |
4601 | { | |
e09875d4 | 4602 | if (find_thread_ptid (lwp->ptid)->stop_requested) |
3e43a32a MS |
4603 | fprintf_unfiltered (gdb_stdlog, |
4604 | "LNSL: already stopped/stop_requested %s\n", | |
d90e17a7 PA |
4605 | target_pid_to_str (lwp->ptid)); |
4606 | else | |
3e43a32a MS |
4607 | fprintf_unfiltered (gdb_stdlog, |
4608 | "LNSL: already stopped/no " | |
4609 | "stop_requested yet %s\n", | |
d90e17a7 | 4610 | target_pid_to_str (lwp->ptid)); |
252fbfc8 PA |
4611 | } |
4612 | } | |
4c28f408 PA |
4613 | return 0; |
4614 | } | |
4615 | ||
4616 | static void | |
1eab8a48 | 4617 | linux_nat_stop (struct target_ops *self, ptid_t ptid) |
4c28f408 | 4618 | { |
bfedc46a PA |
4619 | iterate_over_lwps (ptid, linux_nat_stop_lwp, NULL); |
4620 | } | |
4621 | ||
d90e17a7 | 4622 | static void |
de90e03d | 4623 | linux_nat_close (struct target_ops *self) |
d90e17a7 PA |
4624 | { |
4625 | /* Unregister from the event loop. */ | |
9debeba0 | 4626 | if (linux_nat_is_async_p (self)) |
6a3753b3 | 4627 | linux_nat_async (self, 0); |
d90e17a7 | 4628 | |
d90e17a7 | 4629 | if (linux_ops->to_close) |
de90e03d | 4630 | linux_ops->to_close (linux_ops); |
6a3cb8e8 PA |
4631 | |
4632 | super_close (self); | |
d90e17a7 PA |
4633 | } |
4634 | ||
c0694254 PA |
4635 | /* When requests are passed down from the linux-nat layer to the |
4636 | single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are | |
4637 | used. The address space pointer is stored in the inferior object, | |
4638 | but the common code that is passed such ptid can't tell whether | |
4639 | lwpid is a "main" process id or not (it assumes so). We reverse | |
4640 | look up the "main" process id from the lwp here. */ | |
4641 | ||
70221824 | 4642 | static struct address_space * |
c0694254 PA |
4643 | linux_nat_thread_address_space (struct target_ops *t, ptid_t ptid) |
4644 | { | |
4645 | struct lwp_info *lwp; | |
4646 | struct inferior *inf; | |
4647 | int pid; | |
4648 | ||
dfd4cc63 | 4649 | if (ptid_get_lwp (ptid) == 0) |
c0694254 PA |
4650 | { |
4651 | /* An (lwpid,0,0) ptid. Look up the lwp object to get at the | |
4652 | tgid. */ | |
4653 | lwp = find_lwp_pid (ptid); | |
dfd4cc63 | 4654 | pid = ptid_get_pid (lwp->ptid); |
c0694254 PA |
4655 | } |
4656 | else | |
4657 | { | |
4658 | /* A (pid,lwpid,0) ptid. */ | |
dfd4cc63 | 4659 | pid = ptid_get_pid (ptid); |
c0694254 PA |
4660 | } |
4661 | ||
4662 | inf = find_inferior_pid (pid); | |
4663 | gdb_assert (inf != NULL); | |
4664 | return inf->aspace; | |
4665 | } | |
4666 | ||
dc146f7c VP |
4667 | /* Return the cached value of the processor core for thread PTID. */ |
4668 | ||
70221824 | 4669 | static int |
dc146f7c VP |
4670 | linux_nat_core_of_thread (struct target_ops *ops, ptid_t ptid) |
4671 | { | |
4672 | struct lwp_info *info = find_lwp_pid (ptid); | |
e0881a8e | 4673 | |
dc146f7c VP |
4674 | if (info) |
4675 | return info->core; | |
4676 | return -1; | |
4677 | } | |
4678 | ||
7a6a1731 GB |
4679 | /* Implementation of to_filesystem_is_local. */ |
4680 | ||
4681 | static int | |
4682 | linux_nat_filesystem_is_local (struct target_ops *ops) | |
4683 | { | |
4684 | struct inferior *inf = current_inferior (); | |
4685 | ||
4686 | if (inf->fake_pid_p || inf->pid == 0) | |
4687 | return 1; | |
4688 | ||
4689 | return linux_ns_same (inf->pid, LINUX_NS_MNT); | |
4690 | } | |
4691 | ||
4692 | /* Convert the INF argument passed to a to_fileio_* method | |
4693 | to a process ID suitable for passing to its corresponding | |
4694 | linux_mntns_* function. If INF is non-NULL then the | |
4695 | caller is requesting the filesystem seen by INF. If INF | |
4696 | is NULL then the caller is requesting the filesystem seen | |
4697 | by the GDB. We fall back to GDB's filesystem in the case | |
4698 | that INF is non-NULL but its PID is unknown. */ | |
4699 | ||
4700 | static pid_t | |
4701 | linux_nat_fileio_pid_of (struct inferior *inf) | |
4702 | { | |
4703 | if (inf == NULL || inf->fake_pid_p || inf->pid == 0) | |
4704 | return getpid (); | |
4705 | else | |
4706 | return inf->pid; | |
4707 | } | |
4708 | ||
4709 | /* Implementation of to_fileio_open. */ | |
4710 | ||
4711 | static int | |
4712 | linux_nat_fileio_open (struct target_ops *self, | |
4713 | struct inferior *inf, const char *filename, | |
4313b8c0 GB |
4714 | int flags, int mode, int warn_if_slow, |
4715 | int *target_errno) | |
7a6a1731 GB |
4716 | { |
4717 | int nat_flags; | |
4718 | mode_t nat_mode; | |
4719 | int fd; | |
4720 | ||
4721 | if (fileio_to_host_openflags (flags, &nat_flags) == -1 | |
4722 | || fileio_to_host_mode (mode, &nat_mode) == -1) | |
4723 | { | |
4724 | *target_errno = FILEIO_EINVAL; | |
4725 | return -1; | |
4726 | } | |
4727 | ||
4728 | fd = linux_mntns_open_cloexec (linux_nat_fileio_pid_of (inf), | |
4729 | filename, nat_flags, nat_mode); | |
4730 | if (fd == -1) | |
4731 | *target_errno = host_to_fileio_error (errno); | |
4732 | ||
4733 | return fd; | |
4734 | } | |
4735 | ||
4736 | /* Implementation of to_fileio_readlink. */ | |
4737 | ||
4738 | static char * | |
4739 | linux_nat_fileio_readlink (struct target_ops *self, | |
4740 | struct inferior *inf, const char *filename, | |
4741 | int *target_errno) | |
4742 | { | |
4743 | char buf[PATH_MAX]; | |
4744 | int len; | |
4745 | char *ret; | |
4746 | ||
4747 | len = linux_mntns_readlink (linux_nat_fileio_pid_of (inf), | |
4748 | filename, buf, sizeof (buf)); | |
4749 | if (len < 0) | |
4750 | { | |
4751 | *target_errno = host_to_fileio_error (errno); | |
4752 | return NULL; | |
4753 | } | |
4754 | ||
224c3ddb | 4755 | ret = (char *) xmalloc (len + 1); |
7a6a1731 GB |
4756 | memcpy (ret, buf, len); |
4757 | ret[len] = '\0'; | |
4758 | return ret; | |
4759 | } | |
4760 | ||
4761 | /* Implementation of to_fileio_unlink. */ | |
4762 | ||
4763 | static int | |
4764 | linux_nat_fileio_unlink (struct target_ops *self, | |
4765 | struct inferior *inf, const char *filename, | |
4766 | int *target_errno) | |
4767 | { | |
4768 | int ret; | |
4769 | ||
4770 | ret = linux_mntns_unlink (linux_nat_fileio_pid_of (inf), | |
4771 | filename); | |
4772 | if (ret == -1) | |
4773 | *target_errno = host_to_fileio_error (errno); | |
4774 | ||
4775 | return ret; | |
4776 | } | |
4777 | ||
aa01bd36 PA |
4778 | /* Implementation of the to_thread_events method. */ |
4779 | ||
4780 | static void | |
4781 | linux_nat_thread_events (struct target_ops *ops, int enable) | |
4782 | { | |
4783 | report_thread_events = enable; | |
4784 | } | |
4785 | ||
f973ed9c DJ |
4786 | void |
4787 | linux_nat_add_target (struct target_ops *t) | |
4788 | { | |
f973ed9c DJ |
4789 | /* Save the provided single-threaded target. We save this in a separate |
4790 | variable because another target we've inherited from (e.g. inf-ptrace) | |
4791 | may have saved a pointer to T; we want to use it for the final | |
4792 | process stratum target. */ | |
4793 | linux_ops_saved = *t; | |
4794 | linux_ops = &linux_ops_saved; | |
4795 | ||
4796 | /* Override some methods for multithreading. */ | |
b84876c2 | 4797 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
4798 | t->to_attach = linux_nat_attach; |
4799 | t->to_detach = linux_nat_detach; | |
4800 | t->to_resume = linux_nat_resume; | |
4801 | t->to_wait = linux_nat_wait; | |
2455069d | 4802 | t->to_pass_signals = linux_nat_pass_signals; |
f973ed9c DJ |
4803 | t->to_xfer_partial = linux_nat_xfer_partial; |
4804 | t->to_kill = linux_nat_kill; | |
4805 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
4806 | t->to_thread_alive = linux_nat_thread_alive; | |
8a06aea7 | 4807 | t->to_update_thread_list = linux_nat_update_thread_list; |
f973ed9c | 4808 | t->to_pid_to_str = linux_nat_pid_to_str; |
4694da01 | 4809 | t->to_thread_name = linux_nat_thread_name; |
f973ed9c | 4810 | t->to_has_thread_control = tc_schedlock; |
c0694254 | 4811 | t->to_thread_address_space = linux_nat_thread_address_space; |
ebec9a0f PA |
4812 | t->to_stopped_by_watchpoint = linux_nat_stopped_by_watchpoint; |
4813 | t->to_stopped_data_address = linux_nat_stopped_data_address; | |
faf09f01 PA |
4814 | t->to_stopped_by_sw_breakpoint = linux_nat_stopped_by_sw_breakpoint; |
4815 | t->to_supports_stopped_by_sw_breakpoint = linux_nat_supports_stopped_by_sw_breakpoint; | |
4816 | t->to_stopped_by_hw_breakpoint = linux_nat_stopped_by_hw_breakpoint; | |
4817 | t->to_supports_stopped_by_hw_breakpoint = linux_nat_supports_stopped_by_hw_breakpoint; | |
aa01bd36 | 4818 | t->to_thread_events = linux_nat_thread_events; |
f973ed9c | 4819 | |
b84876c2 PA |
4820 | t->to_can_async_p = linux_nat_can_async_p; |
4821 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 4822 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
fbea99ea | 4823 | t->to_always_non_stop_p = linux_nat_always_non_stop_p; |
b84876c2 | 4824 | t->to_async = linux_nat_async; |
b84876c2 PA |
4825 | t->to_terminal_inferior = linux_nat_terminal_inferior; |
4826 | t->to_terminal_ours = linux_nat_terminal_ours; | |
6a3cb8e8 PA |
4827 | |
4828 | super_close = t->to_close; | |
d90e17a7 | 4829 | t->to_close = linux_nat_close; |
b84876c2 | 4830 | |
4c28f408 PA |
4831 | t->to_stop = linux_nat_stop; |
4832 | ||
d90e17a7 PA |
4833 | t->to_supports_multi_process = linux_nat_supports_multi_process; |
4834 | ||
03583c20 UW |
4835 | t->to_supports_disable_randomization |
4836 | = linux_nat_supports_disable_randomization; | |
4837 | ||
dc146f7c VP |
4838 | t->to_core_of_thread = linux_nat_core_of_thread; |
4839 | ||
7a6a1731 GB |
4840 | t->to_filesystem_is_local = linux_nat_filesystem_is_local; |
4841 | t->to_fileio_open = linux_nat_fileio_open; | |
4842 | t->to_fileio_readlink = linux_nat_fileio_readlink; | |
4843 | t->to_fileio_unlink = linux_nat_fileio_unlink; | |
4844 | ||
f973ed9c DJ |
4845 | /* We don't change the stratum; this target will sit at |
4846 | process_stratum and thread_db will set at thread_stratum. This | |
4847 | is a little strange, since this is a multi-threaded-capable | |
4848 | target, but we want to be on the stack below thread_db, and we | |
4849 | also want to be used for single-threaded processes. */ | |
4850 | ||
4851 | add_target (t); | |
f973ed9c DJ |
4852 | } |
4853 | ||
9f0bdab8 DJ |
4854 | /* Register a method to call whenever a new thread is attached. */ |
4855 | void | |
7b50312a PA |
4856 | linux_nat_set_new_thread (struct target_ops *t, |
4857 | void (*new_thread) (struct lwp_info *)) | |
9f0bdab8 DJ |
4858 | { |
4859 | /* Save the pointer. We only support a single registered instance | |
4860 | of the GNU/Linux native target, so we do not need to map this to | |
4861 | T. */ | |
4862 | linux_nat_new_thread = new_thread; | |
4863 | } | |
4864 | ||
466eecee SM |
4865 | /* Register a method to call whenever a new thread is attached. */ |
4866 | void | |
4867 | linux_nat_set_delete_thread (struct target_ops *t, | |
4868 | void (*delete_thread) (struct arch_lwp_info *)) | |
4869 | { | |
4870 | /* Save the pointer. We only support a single registered instance | |
4871 | of the GNU/Linux native target, so we do not need to map this to | |
4872 | T. */ | |
4873 | linux_nat_delete_thread = delete_thread; | |
4874 | } | |
4875 | ||
26cb8b7c PA |
4876 | /* See declaration in linux-nat.h. */ |
4877 | ||
4878 | void | |
4879 | linux_nat_set_new_fork (struct target_ops *t, | |
4880 | linux_nat_new_fork_ftype *new_fork) | |
4881 | { | |
4882 | /* Save the pointer. */ | |
4883 | linux_nat_new_fork = new_fork; | |
4884 | } | |
4885 | ||
4886 | /* See declaration in linux-nat.h. */ | |
4887 | ||
4888 | void | |
4889 | linux_nat_set_forget_process (struct target_ops *t, | |
4890 | linux_nat_forget_process_ftype *fn) | |
4891 | { | |
4892 | /* Save the pointer. */ | |
4893 | linux_nat_forget_process_hook = fn; | |
4894 | } | |
4895 | ||
4896 | /* See declaration in linux-nat.h. */ | |
4897 | ||
4898 | void | |
4899 | linux_nat_forget_process (pid_t pid) | |
4900 | { | |
4901 | if (linux_nat_forget_process_hook != NULL) | |
4902 | linux_nat_forget_process_hook (pid); | |
4903 | } | |
4904 | ||
5b009018 PA |
4905 | /* Register a method that converts a siginfo object between the layout |
4906 | that ptrace returns, and the layout in the architecture of the | |
4907 | inferior. */ | |
4908 | void | |
4909 | linux_nat_set_siginfo_fixup (struct target_ops *t, | |
a5362b9a | 4910 | int (*siginfo_fixup) (siginfo_t *, |
5b009018 PA |
4911 | gdb_byte *, |
4912 | int)) | |
4913 | { | |
4914 | /* Save the pointer. */ | |
4915 | linux_nat_siginfo_fixup = siginfo_fixup; | |
4916 | } | |
4917 | ||
7b50312a PA |
4918 | /* Register a method to call prior to resuming a thread. */ |
4919 | ||
4920 | void | |
4921 | linux_nat_set_prepare_to_resume (struct target_ops *t, | |
4922 | void (*prepare_to_resume) (struct lwp_info *)) | |
4923 | { | |
4924 | /* Save the pointer. */ | |
4925 | linux_nat_prepare_to_resume = prepare_to_resume; | |
4926 | } | |
4927 | ||
f865ee35 JK |
4928 | /* See linux-nat.h. */ |
4929 | ||
4930 | int | |
4931 | linux_nat_get_siginfo (ptid_t ptid, siginfo_t *siginfo) | |
9f0bdab8 | 4932 | { |
da559b09 | 4933 | int pid; |
9f0bdab8 | 4934 | |
dfd4cc63 | 4935 | pid = ptid_get_lwp (ptid); |
da559b09 | 4936 | if (pid == 0) |
dfd4cc63 | 4937 | pid = ptid_get_pid (ptid); |
f865ee35 | 4938 | |
da559b09 JK |
4939 | errno = 0; |
4940 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, siginfo); | |
4941 | if (errno != 0) | |
4942 | { | |
4943 | memset (siginfo, 0, sizeof (*siginfo)); | |
4944 | return 0; | |
4945 | } | |
f865ee35 | 4946 | return 1; |
9f0bdab8 DJ |
4947 | } |
4948 | ||
7b669087 GB |
4949 | /* See nat/linux-nat.h. */ |
4950 | ||
4951 | ptid_t | |
4952 | current_lwp_ptid (void) | |
4953 | { | |
4954 | gdb_assert (ptid_lwp_p (inferior_ptid)); | |
4955 | return inferior_ptid; | |
4956 | } | |
4957 | ||
d6b0e80f AC |
4958 | void |
4959 | _initialize_linux_nat (void) | |
4960 | { | |
ccce17b0 YQ |
4961 | add_setshow_zuinteger_cmd ("lin-lwp", class_maintenance, |
4962 | &debug_linux_nat, _("\ | |
b84876c2 PA |
4963 | Set debugging of GNU/Linux lwp module."), _("\ |
4964 | Show debugging of GNU/Linux lwp module."), _("\ | |
4965 | Enables printf debugging output."), | |
ccce17b0 YQ |
4966 | NULL, |
4967 | show_debug_linux_nat, | |
4968 | &setdebuglist, &showdebuglist); | |
b84876c2 | 4969 | |
7a6a1731 GB |
4970 | add_setshow_boolean_cmd ("linux-namespaces", class_maintenance, |
4971 | &debug_linux_namespaces, _("\ | |
4972 | Set debugging of GNU/Linux namespaces module."), _("\ | |
4973 | Show debugging of GNU/Linux namespaces module."), _("\ | |
4974 | Enables printf debugging output."), | |
4975 | NULL, | |
4976 | NULL, | |
4977 | &setdebuglist, &showdebuglist); | |
4978 | ||
b84876c2 | 4979 | /* Save this mask as the default. */ |
d6b0e80f AC |
4980 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
4981 | ||
7feb7d06 PA |
4982 | /* Install a SIGCHLD handler. */ |
4983 | sigchld_action.sa_handler = sigchld_handler; | |
4984 | sigemptyset (&sigchld_action.sa_mask); | |
4985 | sigchld_action.sa_flags = SA_RESTART; | |
b84876c2 PA |
4986 | |
4987 | /* Make it the default. */ | |
7feb7d06 | 4988 | sigaction (SIGCHLD, &sigchld_action, NULL); |
d6b0e80f AC |
4989 | |
4990 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
4991 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
4992 | sigdelset (&suspend_mask, SIGCHLD); | |
4993 | ||
7feb7d06 | 4994 | sigemptyset (&blocked_mask); |
774113b0 PA |
4995 | |
4996 | lwp_lwpid_htab_create (); | |
d6b0e80f AC |
4997 | } |
4998 | \f | |
4999 | ||
5000 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
5001 | the GNU/Linux Threads library and therefore doesn't really belong | |
5002 | here. */ | |
5003 | ||
d6b0e80f AC |
5004 | /* Return the set of signals used by the threads library in *SET. */ |
5005 | ||
5006 | void | |
5007 | lin_thread_get_thread_signals (sigset_t *set) | |
5008 | { | |
d6b0e80f AC |
5009 | sigemptyset (set); |
5010 | ||
4a6ed09b PA |
5011 | /* NPTL reserves the first two RT signals, but does not provide any |
5012 | way for the debugger to query the signal numbers - fortunately | |
5013 | they don't change. */ | |
5014 | sigaddset (set, __SIGRTMIN); | |
5015 | sigaddset (set, __SIGRTMIN + 1); | |
d6b0e80f | 5016 | } |