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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
618f726f | 2 | Copyright (C) 1995-2016 Free Software Foundation, Inc. |
da6d8c04 DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
da6d8c04 DJ |
9 | (at your option) any later version. |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
da6d8c04 DJ |
18 | |
19 | #include "server.h" | |
58caa3dc | 20 | #include "linux-low.h" |
125f8a3d | 21 | #include "nat/linux-osdata.h" |
58b4daa5 | 22 | #include "agent.h" |
de0d863e | 23 | #include "tdesc.h" |
b20a6524 | 24 | #include "rsp-low.h" |
da6d8c04 | 25 | |
96d7229d LM |
26 | #include "nat/linux-nat.h" |
27 | #include "nat/linux-waitpid.h" | |
8bdce1ff | 28 | #include "gdb_wait.h" |
5826e159 | 29 | #include "nat/gdb_ptrace.h" |
125f8a3d GB |
30 | #include "nat/linux-ptrace.h" |
31 | #include "nat/linux-procfs.h" | |
8cc73a39 | 32 | #include "nat/linux-personality.h" |
da6d8c04 DJ |
33 | #include <signal.h> |
34 | #include <sys/ioctl.h> | |
35 | #include <fcntl.h> | |
0a30fbc4 | 36 | #include <unistd.h> |
fd500816 | 37 | #include <sys/syscall.h> |
f9387fc3 | 38 | #include <sched.h> |
07e059b5 VP |
39 | #include <ctype.h> |
40 | #include <pwd.h> | |
41 | #include <sys/types.h> | |
42 | #include <dirent.h> | |
53ce3c39 | 43 | #include <sys/stat.h> |
efcbbd14 | 44 | #include <sys/vfs.h> |
1570b33e | 45 | #include <sys/uio.h> |
602e3198 | 46 | #include "filestuff.h" |
c144c7a0 | 47 | #include "tracepoint.h" |
533b0600 | 48 | #include "hostio.h" |
276d4552 | 49 | #include <inttypes.h> |
957f3f49 DE |
50 | #ifndef ELFMAG0 |
51 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
52 | then ELFMAG0 will have been defined. If it didn't get included by | |
53 | gdb_proc_service.h then including it will likely introduce a duplicate | |
54 | definition of elf_fpregset_t. */ | |
55 | #include <elf.h> | |
56 | #endif | |
14d2069a | 57 | #include "nat/linux-namespaces.h" |
efcbbd14 UW |
58 | |
59 | #ifndef SPUFS_MAGIC | |
60 | #define SPUFS_MAGIC 0x23c9b64e | |
61 | #endif | |
da6d8c04 | 62 | |
03583c20 UW |
63 | #ifdef HAVE_PERSONALITY |
64 | # include <sys/personality.h> | |
65 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
66 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
67 | # endif | |
68 | #endif | |
69 | ||
fd462a61 DJ |
70 | #ifndef O_LARGEFILE |
71 | #define O_LARGEFILE 0 | |
72 | #endif | |
1a981360 | 73 | |
db0dfaa0 LM |
74 | /* Some targets did not define these ptrace constants from the start, |
75 | so gdbserver defines them locally here. In the future, these may | |
76 | be removed after they are added to asm/ptrace.h. */ | |
77 | #if !(defined(PT_TEXT_ADDR) \ | |
78 | || defined(PT_DATA_ADDR) \ | |
79 | || defined(PT_TEXT_END_ADDR)) | |
80 | #if defined(__mcoldfire__) | |
81 | /* These are still undefined in 3.10 kernels. */ | |
82 | #define PT_TEXT_ADDR 49*4 | |
83 | #define PT_DATA_ADDR 50*4 | |
84 | #define PT_TEXT_END_ADDR 51*4 | |
85 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
86 | #elif defined(BFIN) | |
87 | #define PT_TEXT_ADDR 220 | |
88 | #define PT_TEXT_END_ADDR 224 | |
89 | #define PT_DATA_ADDR 228 | |
90 | /* These are still undefined in 3.10 kernels. */ | |
91 | #elif defined(__TMS320C6X__) | |
92 | #define PT_TEXT_ADDR (0x10000*4) | |
93 | #define PT_DATA_ADDR (0x10004*4) | |
94 | #define PT_TEXT_END_ADDR (0x10008*4) | |
95 | #endif | |
96 | #endif | |
97 | ||
9accd112 | 98 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 99 | # include "nat/linux-btrace.h" |
734b0e4b | 100 | # include "btrace-common.h" |
9accd112 MM |
101 | #endif |
102 | ||
8365dcf5 TJB |
103 | #ifndef HAVE_ELF32_AUXV_T |
104 | /* Copied from glibc's elf.h. */ | |
105 | typedef struct | |
106 | { | |
107 | uint32_t a_type; /* Entry type */ | |
108 | union | |
109 | { | |
110 | uint32_t a_val; /* Integer value */ | |
111 | /* We use to have pointer elements added here. We cannot do that, | |
112 | though, since it does not work when using 32-bit definitions | |
113 | on 64-bit platforms and vice versa. */ | |
114 | } a_un; | |
115 | } Elf32_auxv_t; | |
116 | #endif | |
117 | ||
118 | #ifndef HAVE_ELF64_AUXV_T | |
119 | /* Copied from glibc's elf.h. */ | |
120 | typedef struct | |
121 | { | |
122 | uint64_t a_type; /* Entry type */ | |
123 | union | |
124 | { | |
125 | uint64_t a_val; /* Integer value */ | |
126 | /* We use to have pointer elements added here. We cannot do that, | |
127 | though, since it does not work when using 32-bit definitions | |
128 | on 64-bit platforms and vice versa. */ | |
129 | } a_un; | |
130 | } Elf64_auxv_t; | |
131 | #endif | |
132 | ||
ded48a5e YQ |
133 | /* Does the current host support PTRACE_GETREGSET? */ |
134 | int have_ptrace_getregset = -1; | |
135 | ||
cff068da GB |
136 | /* LWP accessors. */ |
137 | ||
138 | /* See nat/linux-nat.h. */ | |
139 | ||
140 | ptid_t | |
141 | ptid_of_lwp (struct lwp_info *lwp) | |
142 | { | |
143 | return ptid_of (get_lwp_thread (lwp)); | |
144 | } | |
145 | ||
146 | /* See nat/linux-nat.h. */ | |
147 | ||
4b134ca1 GB |
148 | void |
149 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
150 | struct arch_lwp_info *info) | |
151 | { | |
152 | lwp->arch_private = info; | |
153 | } | |
154 | ||
155 | /* See nat/linux-nat.h. */ | |
156 | ||
157 | struct arch_lwp_info * | |
158 | lwp_arch_private_info (struct lwp_info *lwp) | |
159 | { | |
160 | return lwp->arch_private; | |
161 | } | |
162 | ||
163 | /* See nat/linux-nat.h. */ | |
164 | ||
cff068da GB |
165 | int |
166 | lwp_is_stopped (struct lwp_info *lwp) | |
167 | { | |
168 | return lwp->stopped; | |
169 | } | |
170 | ||
171 | /* See nat/linux-nat.h. */ | |
172 | ||
173 | enum target_stop_reason | |
174 | lwp_stop_reason (struct lwp_info *lwp) | |
175 | { | |
176 | return lwp->stop_reason; | |
177 | } | |
178 | ||
05044653 PA |
179 | /* A list of all unknown processes which receive stop signals. Some |
180 | other process will presumably claim each of these as forked | |
181 | children momentarily. */ | |
24a09b5f | 182 | |
05044653 PA |
183 | struct simple_pid_list |
184 | { | |
185 | /* The process ID. */ | |
186 | int pid; | |
187 | ||
188 | /* The status as reported by waitpid. */ | |
189 | int status; | |
190 | ||
191 | /* Next in chain. */ | |
192 | struct simple_pid_list *next; | |
193 | }; | |
194 | struct simple_pid_list *stopped_pids; | |
195 | ||
196 | /* Trivial list manipulation functions to keep track of a list of new | |
197 | stopped processes. */ | |
198 | ||
199 | static void | |
200 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
201 | { | |
8d749320 | 202 | struct simple_pid_list *new_pid = XNEW (struct simple_pid_list); |
05044653 PA |
203 | |
204 | new_pid->pid = pid; | |
205 | new_pid->status = status; | |
206 | new_pid->next = *listp; | |
207 | *listp = new_pid; | |
208 | } | |
209 | ||
210 | static int | |
211 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
212 | { | |
213 | struct simple_pid_list **p; | |
214 | ||
215 | for (p = listp; *p != NULL; p = &(*p)->next) | |
216 | if ((*p)->pid == pid) | |
217 | { | |
218 | struct simple_pid_list *next = (*p)->next; | |
219 | ||
220 | *statusp = (*p)->status; | |
221 | xfree (*p); | |
222 | *p = next; | |
223 | return 1; | |
224 | } | |
225 | return 0; | |
226 | } | |
24a09b5f | 227 | |
bde24c0a PA |
228 | enum stopping_threads_kind |
229 | { | |
230 | /* Not stopping threads presently. */ | |
231 | NOT_STOPPING_THREADS, | |
232 | ||
233 | /* Stopping threads. */ | |
234 | STOPPING_THREADS, | |
235 | ||
236 | /* Stopping and suspending threads. */ | |
237 | STOPPING_AND_SUSPENDING_THREADS | |
238 | }; | |
239 | ||
240 | /* This is set while stop_all_lwps is in effect. */ | |
241 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
242 | |
243 | /* FIXME make into a target method? */ | |
24a09b5f | 244 | int using_threads = 1; |
24a09b5f | 245 | |
fa593d66 PA |
246 | /* True if we're presently stabilizing threads (moving them out of |
247 | jump pads). */ | |
248 | static int stabilizing_threads; | |
249 | ||
2acc282a | 250 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 251 | int step, int signal, siginfo_t *info); |
2bd7c093 | 252 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
253 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
254 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
fa96cb38 PA |
255 | static int linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
256 | int *wstat, int options); | |
95954743 | 257 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
b3312d80 | 258 | static struct lwp_info *add_lwp (ptid_t ptid); |
94585166 | 259 | static void linux_mourn (struct process_info *process); |
c35fafde | 260 | static int linux_stopped_by_watchpoint (void); |
95954743 | 261 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
00db26fa | 262 | static int lwp_is_marked_dead (struct lwp_info *lwp); |
d50171e4 | 263 | static void proceed_all_lwps (void); |
d50171e4 | 264 | static int finish_step_over (struct lwp_info *lwp); |
d50171e4 | 265 | static int kill_lwp (unsigned long lwpid, int signo); |
863d01bd PA |
266 | static void enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info); |
267 | static void complete_ongoing_step_over (void); | |
ece66d65 | 268 | static int linux_low_ptrace_options (int attached); |
d50171e4 | 269 | |
582511be PA |
270 | /* When the event-loop is doing a step-over, this points at the thread |
271 | being stepped. */ | |
272 | ptid_t step_over_bkpt; | |
273 | ||
7d00775e | 274 | /* True if the low target can hardware single-step. */ |
d50171e4 PA |
275 | |
276 | static int | |
277 | can_hardware_single_step (void) | |
278 | { | |
7d00775e AT |
279 | if (the_low_target.supports_hardware_single_step != NULL) |
280 | return the_low_target.supports_hardware_single_step (); | |
281 | else | |
282 | return 0; | |
283 | } | |
284 | ||
285 | /* True if the low target can software single-step. Such targets | |
fa5308bd | 286 | implement the GET_NEXT_PCS callback. */ |
7d00775e AT |
287 | |
288 | static int | |
289 | can_software_single_step (void) | |
290 | { | |
fa5308bd | 291 | return (the_low_target.get_next_pcs != NULL); |
d50171e4 PA |
292 | } |
293 | ||
294 | /* True if the low target supports memory breakpoints. If so, we'll | |
295 | have a GET_PC implementation. */ | |
296 | ||
297 | static int | |
298 | supports_breakpoints (void) | |
299 | { | |
300 | return (the_low_target.get_pc != NULL); | |
301 | } | |
0d62e5e8 | 302 | |
fa593d66 PA |
303 | /* Returns true if this target can support fast tracepoints. This |
304 | does not mean that the in-process agent has been loaded in the | |
305 | inferior. */ | |
306 | ||
307 | static int | |
308 | supports_fast_tracepoints (void) | |
309 | { | |
310 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
311 | } | |
312 | ||
c2d6af84 PA |
313 | /* True if LWP is stopped in its stepping range. */ |
314 | ||
315 | static int | |
316 | lwp_in_step_range (struct lwp_info *lwp) | |
317 | { | |
318 | CORE_ADDR pc = lwp->stop_pc; | |
319 | ||
320 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
321 | } | |
322 | ||
0d62e5e8 DJ |
323 | struct pending_signals |
324 | { | |
325 | int signal; | |
32ca6d61 | 326 | siginfo_t info; |
0d62e5e8 DJ |
327 | struct pending_signals *prev; |
328 | }; | |
611cb4a5 | 329 | |
bd99dc85 PA |
330 | /* The read/write ends of the pipe registered as waitable file in the |
331 | event loop. */ | |
332 | static int linux_event_pipe[2] = { -1, -1 }; | |
333 | ||
334 | /* True if we're currently in async mode. */ | |
335 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
336 | ||
02fc4de7 | 337 | static void send_sigstop (struct lwp_info *lwp); |
fa96cb38 | 338 | static void wait_for_sigstop (void); |
bd99dc85 | 339 | |
d0722149 DE |
340 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
341 | ||
342 | static int | |
214d508e | 343 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 344 | { |
214d508e L |
345 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
346 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
347 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
348 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
349 | { | |
350 | *machine = header->e_machine; | |
351 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
352 | ||
353 | } | |
354 | *machine = EM_NONE; | |
355 | return -1; | |
d0722149 DE |
356 | } |
357 | ||
358 | /* Return non-zero if FILE is a 64-bit ELF file, | |
359 | zero if the file is not a 64-bit ELF file, | |
360 | and -1 if the file is not accessible or doesn't exist. */ | |
361 | ||
be07f1a2 | 362 | static int |
214d508e | 363 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 364 | { |
957f3f49 | 365 | Elf64_Ehdr header; |
d0722149 DE |
366 | int fd; |
367 | ||
368 | fd = open (file, O_RDONLY); | |
369 | if (fd < 0) | |
370 | return -1; | |
371 | ||
372 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
373 | { | |
374 | close (fd); | |
375 | return 0; | |
376 | } | |
377 | close (fd); | |
378 | ||
214d508e | 379 | return elf_64_header_p (&header, machine); |
d0722149 DE |
380 | } |
381 | ||
be07f1a2 PA |
382 | /* Accepts an integer PID; Returns true if the executable PID is |
383 | running is a 64-bit ELF file.. */ | |
384 | ||
385 | int | |
214d508e | 386 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 387 | { |
d8d2a3ee | 388 | char file[PATH_MAX]; |
be07f1a2 PA |
389 | |
390 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 391 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
392 | } |
393 | ||
bd99dc85 PA |
394 | static void |
395 | delete_lwp (struct lwp_info *lwp) | |
396 | { | |
fa96cb38 PA |
397 | struct thread_info *thr = get_lwp_thread (lwp); |
398 | ||
399 | if (debug_threads) | |
400 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
401 | ||
402 | remove_thread (thr); | |
aa5ca48f | 403 | free (lwp->arch_private); |
bd99dc85 PA |
404 | free (lwp); |
405 | } | |
406 | ||
95954743 PA |
407 | /* Add a process to the common process list, and set its private |
408 | data. */ | |
409 | ||
410 | static struct process_info * | |
411 | linux_add_process (int pid, int attached) | |
412 | { | |
413 | struct process_info *proc; | |
414 | ||
95954743 | 415 | proc = add_process (pid, attached); |
8d749320 | 416 | proc->priv = XCNEW (struct process_info_private); |
95954743 | 417 | |
aa5ca48f | 418 | if (the_low_target.new_process != NULL) |
fe978cb0 | 419 | proc->priv->arch_private = the_low_target.new_process (); |
aa5ca48f | 420 | |
95954743 PA |
421 | return proc; |
422 | } | |
423 | ||
582511be PA |
424 | static CORE_ADDR get_pc (struct lwp_info *lwp); |
425 | ||
ece66d65 | 426 | /* Call the target arch_setup function on the current thread. */ |
94585166 DB |
427 | |
428 | static void | |
429 | linux_arch_setup (void) | |
430 | { | |
431 | the_low_target.arch_setup (); | |
432 | } | |
433 | ||
434 | /* Call the target arch_setup function on THREAD. */ | |
435 | ||
436 | static void | |
437 | linux_arch_setup_thread (struct thread_info *thread) | |
438 | { | |
439 | struct thread_info *saved_thread; | |
440 | ||
441 | saved_thread = current_thread; | |
442 | current_thread = thread; | |
443 | ||
444 | linux_arch_setup (); | |
445 | ||
446 | current_thread = saved_thread; | |
447 | } | |
448 | ||
449 | /* Handle a GNU/Linux extended wait response. If we see a clone, | |
450 | fork, or vfork event, we need to add the new LWP to our list | |
451 | (and return 0 so as not to report the trap to higher layers). | |
452 | If we see an exec event, we will modify ORIG_EVENT_LWP to point | |
453 | to a new LWP representing the new program. */ | |
0d62e5e8 | 454 | |
de0d863e | 455 | static int |
94585166 | 456 | handle_extended_wait (struct lwp_info **orig_event_lwp, int wstat) |
24a09b5f | 457 | { |
94585166 | 458 | struct lwp_info *event_lwp = *orig_event_lwp; |
89a5711c | 459 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 460 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
54a0b537 | 461 | struct lwp_info *new_lwp; |
24a09b5f | 462 | |
65706a29 PA |
463 | gdb_assert (event_lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
464 | ||
82075af2 JS |
465 | /* All extended events we currently use are mid-syscall. Only |
466 | PTRACE_EVENT_STOP is delivered more like a signal-stop, but | |
467 | you have to be using PTRACE_SEIZE to get that. */ | |
468 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
469 | ||
c269dbdb DB |
470 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
471 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f | 472 | { |
95954743 | 473 | ptid_t ptid; |
24a09b5f | 474 | unsigned long new_pid; |
05044653 | 475 | int ret, status; |
24a09b5f | 476 | |
de0d863e | 477 | /* Get the pid of the new lwp. */ |
d86d4aaf | 478 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 479 | &new_pid); |
24a09b5f DJ |
480 | |
481 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 482 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
483 | { |
484 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
485 | hits the SIGSTOP, but we're already attached. */ | |
486 | ||
97438e3f | 487 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
488 | |
489 | if (ret == -1) | |
490 | perror_with_name ("waiting for new child"); | |
491 | else if (ret != new_pid) | |
492 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 493 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
494 | warning ("wait returned unexpected status 0x%x", status); |
495 | } | |
496 | ||
c269dbdb | 497 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
de0d863e DB |
498 | { |
499 | struct process_info *parent_proc; | |
500 | struct process_info *child_proc; | |
501 | struct lwp_info *child_lwp; | |
bfacd19d | 502 | struct thread_info *child_thr; |
de0d863e DB |
503 | struct target_desc *tdesc; |
504 | ||
505 | ptid = ptid_build (new_pid, new_pid, 0); | |
506 | ||
507 | if (debug_threads) | |
508 | { | |
509 | debug_printf ("HEW: Got fork event from LWP %ld, " | |
510 | "new child is %d\n", | |
511 | ptid_get_lwp (ptid_of (event_thr)), | |
512 | ptid_get_pid (ptid)); | |
513 | } | |
514 | ||
515 | /* Add the new process to the tables and clone the breakpoint | |
516 | lists of the parent. We need to do this even if the new process | |
517 | will be detached, since we will need the process object and the | |
518 | breakpoints to remove any breakpoints from memory when we | |
519 | detach, and the client side will access registers. */ | |
520 | child_proc = linux_add_process (new_pid, 0); | |
521 | gdb_assert (child_proc != NULL); | |
522 | child_lwp = add_lwp (ptid); | |
523 | gdb_assert (child_lwp != NULL); | |
524 | child_lwp->stopped = 1; | |
bfacd19d DB |
525 | child_lwp->must_set_ptrace_flags = 1; |
526 | child_lwp->status_pending_p = 0; | |
527 | child_thr = get_lwp_thread (child_lwp); | |
528 | child_thr->last_resume_kind = resume_stop; | |
998d452a PA |
529 | child_thr->last_status.kind = TARGET_WAITKIND_STOPPED; |
530 | ||
863d01bd PA |
531 | /* If we're suspending all threads, leave this one suspended |
532 | too. */ | |
533 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
534 | { | |
535 | if (debug_threads) | |
536 | debug_printf ("HEW: leaving child suspended\n"); | |
537 | child_lwp->suspended = 1; | |
538 | } | |
539 | ||
de0d863e DB |
540 | parent_proc = get_thread_process (event_thr); |
541 | child_proc->attached = parent_proc->attached; | |
542 | clone_all_breakpoints (&child_proc->breakpoints, | |
543 | &child_proc->raw_breakpoints, | |
544 | parent_proc->breakpoints); | |
545 | ||
8d749320 | 546 | tdesc = XNEW (struct target_desc); |
de0d863e DB |
547 | copy_target_description (tdesc, parent_proc->tdesc); |
548 | child_proc->tdesc = tdesc; | |
de0d863e | 549 | |
3a8a0396 DB |
550 | /* Clone arch-specific process data. */ |
551 | if (the_low_target.new_fork != NULL) | |
552 | the_low_target.new_fork (parent_proc, child_proc); | |
553 | ||
de0d863e | 554 | /* Save fork info in the parent thread. */ |
c269dbdb DB |
555 | if (event == PTRACE_EVENT_FORK) |
556 | event_lwp->waitstatus.kind = TARGET_WAITKIND_FORKED; | |
557 | else if (event == PTRACE_EVENT_VFORK) | |
558 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORKED; | |
559 | ||
de0d863e | 560 | event_lwp->waitstatus.value.related_pid = ptid; |
c269dbdb | 561 | |
de0d863e DB |
562 | /* The status_pending field contains bits denoting the |
563 | extended event, so when the pending event is handled, | |
564 | the handler will look at lwp->waitstatus. */ | |
565 | event_lwp->status_pending_p = 1; | |
566 | event_lwp->status_pending = wstat; | |
567 | ||
568 | /* Report the event. */ | |
569 | return 0; | |
570 | } | |
571 | ||
fa96cb38 PA |
572 | if (debug_threads) |
573 | debug_printf ("HEW: Got clone event " | |
574 | "from LWP %ld, new child is LWP %ld\n", | |
575 | lwpid_of (event_thr), new_pid); | |
576 | ||
d86d4aaf | 577 | ptid = ptid_build (pid_of (event_thr), new_pid, 0); |
b3312d80 | 578 | new_lwp = add_lwp (ptid); |
24a09b5f | 579 | |
e27d73f6 DE |
580 | /* Either we're going to immediately resume the new thread |
581 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
582 | thinks the thread is currently running, so set this first | |
583 | before calling linux_resume_one_lwp. */ | |
584 | new_lwp->stopped = 1; | |
585 | ||
bde24c0a PA |
586 | /* If we're suspending all threads, leave this one suspended |
587 | too. */ | |
588 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
589 | new_lwp->suspended = 1; | |
590 | ||
da5898ce DJ |
591 | /* Normally we will get the pending SIGSTOP. But in some cases |
592 | we might get another signal delivered to the group first. | |
f21cc1a2 | 593 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 594 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 595 | { |
54a0b537 | 596 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
597 | new_lwp->status_pending_p = 1; |
598 | new_lwp->status_pending = status; | |
da5898ce | 599 | } |
65706a29 PA |
600 | else if (report_thread_events) |
601 | { | |
602 | new_lwp->waitstatus.kind = TARGET_WAITKIND_THREAD_CREATED; | |
603 | new_lwp->status_pending_p = 1; | |
604 | new_lwp->status_pending = status; | |
605 | } | |
de0d863e DB |
606 | |
607 | /* Don't report the event. */ | |
608 | return 1; | |
24a09b5f | 609 | } |
c269dbdb DB |
610 | else if (event == PTRACE_EVENT_VFORK_DONE) |
611 | { | |
612 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
613 | ||
614 | /* Report the event. */ | |
615 | return 0; | |
616 | } | |
94585166 DB |
617 | else if (event == PTRACE_EVENT_EXEC && report_exec_events) |
618 | { | |
619 | struct process_info *proc; | |
82075af2 | 620 | VEC (int) *syscalls_to_catch; |
94585166 DB |
621 | ptid_t event_ptid; |
622 | pid_t event_pid; | |
623 | ||
624 | if (debug_threads) | |
625 | { | |
626 | debug_printf ("HEW: Got exec event from LWP %ld\n", | |
627 | lwpid_of (event_thr)); | |
628 | } | |
629 | ||
630 | /* Get the event ptid. */ | |
631 | event_ptid = ptid_of (event_thr); | |
632 | event_pid = ptid_get_pid (event_ptid); | |
633 | ||
82075af2 | 634 | /* Save the syscall list from the execing process. */ |
94585166 | 635 | proc = get_thread_process (event_thr); |
82075af2 JS |
636 | syscalls_to_catch = proc->syscalls_to_catch; |
637 | proc->syscalls_to_catch = NULL; | |
638 | ||
639 | /* Delete the execing process and all its threads. */ | |
94585166 DB |
640 | linux_mourn (proc); |
641 | current_thread = NULL; | |
642 | ||
643 | /* Create a new process/lwp/thread. */ | |
644 | proc = linux_add_process (event_pid, 0); | |
645 | event_lwp = add_lwp (event_ptid); | |
646 | event_thr = get_lwp_thread (event_lwp); | |
647 | gdb_assert (current_thread == event_thr); | |
648 | linux_arch_setup_thread (event_thr); | |
649 | ||
650 | /* Set the event status. */ | |
651 | event_lwp->waitstatus.kind = TARGET_WAITKIND_EXECD; | |
652 | event_lwp->waitstatus.value.execd_pathname | |
653 | = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr))); | |
654 | ||
655 | /* Mark the exec status as pending. */ | |
656 | event_lwp->stopped = 1; | |
657 | event_lwp->status_pending_p = 1; | |
658 | event_lwp->status_pending = wstat; | |
659 | event_thr->last_resume_kind = resume_continue; | |
660 | event_thr->last_status.kind = TARGET_WAITKIND_IGNORE; | |
661 | ||
82075af2 JS |
662 | /* Update syscall state in the new lwp, effectively mid-syscall too. */ |
663 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
664 | ||
665 | /* Restore the list to catch. Don't rely on the client, which is free | |
666 | to avoid sending a new list when the architecture doesn't change. | |
667 | Also, for ANY_SYSCALL, the architecture doesn't really matter. */ | |
668 | proc->syscalls_to_catch = syscalls_to_catch; | |
669 | ||
94585166 DB |
670 | /* Report the event. */ |
671 | *orig_event_lwp = event_lwp; | |
672 | return 0; | |
673 | } | |
de0d863e DB |
674 | |
675 | internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event); | |
24a09b5f DJ |
676 | } |
677 | ||
d50171e4 PA |
678 | /* Return the PC as read from the regcache of LWP, without any |
679 | adjustment. */ | |
680 | ||
681 | static CORE_ADDR | |
682 | get_pc (struct lwp_info *lwp) | |
683 | { | |
0bfdf32f | 684 | struct thread_info *saved_thread; |
d50171e4 PA |
685 | struct regcache *regcache; |
686 | CORE_ADDR pc; | |
687 | ||
688 | if (the_low_target.get_pc == NULL) | |
689 | return 0; | |
690 | ||
0bfdf32f GB |
691 | saved_thread = current_thread; |
692 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 693 | |
0bfdf32f | 694 | regcache = get_thread_regcache (current_thread, 1); |
d50171e4 PA |
695 | pc = (*the_low_target.get_pc) (regcache); |
696 | ||
697 | if (debug_threads) | |
87ce2a04 | 698 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 699 | |
0bfdf32f | 700 | current_thread = saved_thread; |
d50171e4 PA |
701 | return pc; |
702 | } | |
703 | ||
82075af2 JS |
704 | /* This function should only be called if LWP got a SYSCALL_SIGTRAP. |
705 | Fill *SYSNO with the syscall nr trapped. Fill *SYSRET with the | |
706 | return code. */ | |
707 | ||
708 | static void | |
709 | get_syscall_trapinfo (struct lwp_info *lwp, int *sysno, int *sysret) | |
710 | { | |
711 | struct thread_info *saved_thread; | |
712 | struct regcache *regcache; | |
713 | ||
714 | if (the_low_target.get_syscall_trapinfo == NULL) | |
715 | { | |
716 | /* If we cannot get the syscall trapinfo, report an unknown | |
717 | system call number and -ENOSYS return value. */ | |
718 | *sysno = UNKNOWN_SYSCALL; | |
719 | *sysret = -ENOSYS; | |
720 | return; | |
721 | } | |
722 | ||
723 | saved_thread = current_thread; | |
724 | current_thread = get_lwp_thread (lwp); | |
725 | ||
726 | regcache = get_thread_regcache (current_thread, 1); | |
727 | (*the_low_target.get_syscall_trapinfo) (regcache, sysno, sysret); | |
728 | ||
729 | if (debug_threads) | |
730 | { | |
731 | debug_printf ("get_syscall_trapinfo sysno %d sysret %d\n", | |
732 | *sysno, *sysret); | |
733 | } | |
734 | ||
735 | current_thread = saved_thread; | |
736 | } | |
737 | ||
e7ad2f14 | 738 | static int check_stopped_by_watchpoint (struct lwp_info *child); |
0d62e5e8 | 739 | |
e7ad2f14 PA |
740 | /* Called when the LWP stopped for a signal/trap. If it stopped for a |
741 | trap check what caused it (breakpoint, watchpoint, trace, etc.), | |
742 | and save the result in the LWP's stop_reason field. If it stopped | |
743 | for a breakpoint, decrement the PC if necessary on the lwp's | |
744 | architecture. Returns true if we now have the LWP's stop PC. */ | |
0d62e5e8 | 745 | |
582511be | 746 | static int |
e7ad2f14 | 747 | save_stop_reason (struct lwp_info *lwp) |
0d62e5e8 | 748 | { |
582511be PA |
749 | CORE_ADDR pc; |
750 | CORE_ADDR sw_breakpoint_pc; | |
751 | struct thread_info *saved_thread; | |
3e572f71 PA |
752 | #if USE_SIGTRAP_SIGINFO |
753 | siginfo_t siginfo; | |
754 | #endif | |
d50171e4 PA |
755 | |
756 | if (the_low_target.get_pc == NULL) | |
757 | return 0; | |
0d62e5e8 | 758 | |
582511be PA |
759 | pc = get_pc (lwp); |
760 | sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break; | |
d50171e4 | 761 | |
582511be PA |
762 | /* breakpoint_at reads from the current thread. */ |
763 | saved_thread = current_thread; | |
764 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 765 | |
3e572f71 PA |
766 | #if USE_SIGTRAP_SIGINFO |
767 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
768 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
769 | { | |
770 | if (siginfo.si_signo == SIGTRAP) | |
771 | { | |
e7ad2f14 PA |
772 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code) |
773 | && GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) | |
3e572f71 | 774 | { |
e7ad2f14 PA |
775 | /* The si_code is ambiguous on this arch -- check debug |
776 | registers. */ | |
777 | if (!check_stopped_by_watchpoint (lwp)) | |
778 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
779 | } | |
780 | else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) | |
781 | { | |
782 | /* If we determine the LWP stopped for a SW breakpoint, | |
783 | trust it. Particularly don't check watchpoint | |
784 | registers, because at least on s390, we'd find | |
785 | stopped-by-watchpoint as long as there's a watchpoint | |
786 | set. */ | |
3e572f71 | 787 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
3e572f71 | 788 | } |
e7ad2f14 | 789 | else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) |
3e572f71 | 790 | { |
e7ad2f14 PA |
791 | /* This can indicate either a hardware breakpoint or |
792 | hardware watchpoint. Check debug registers. */ | |
793 | if (!check_stopped_by_watchpoint (lwp)) | |
794 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
3e572f71 | 795 | } |
2bf6fb9d PA |
796 | else if (siginfo.si_code == TRAP_TRACE) |
797 | { | |
e7ad2f14 PA |
798 | /* We may have single stepped an instruction that |
799 | triggered a watchpoint. In that case, on some | |
800 | architectures (such as x86), instead of TRAP_HWBKPT, | |
801 | si_code indicates TRAP_TRACE, and we need to check | |
802 | the debug registers separately. */ | |
803 | if (!check_stopped_by_watchpoint (lwp)) | |
804 | lwp->stop_reason = TARGET_STOPPED_BY_SINGLE_STEP; | |
2bf6fb9d | 805 | } |
3e572f71 PA |
806 | } |
807 | } | |
808 | #else | |
582511be PA |
809 | /* We may have just stepped a breakpoint instruction. E.g., in |
810 | non-stop mode, GDB first tells the thread A to step a range, and | |
811 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
812 | case we need to report the breakpoint PC. */ |
813 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
582511be | 814 | && (*the_low_target.breakpoint_at) (sw_breakpoint_pc)) |
e7ad2f14 PA |
815 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
816 | ||
817 | if (hardware_breakpoint_inserted_here (pc)) | |
818 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
819 | ||
820 | if (lwp->stop_reason == TARGET_STOPPED_BY_NO_REASON) | |
821 | check_stopped_by_watchpoint (lwp); | |
822 | #endif | |
823 | ||
824 | if (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) | |
582511be PA |
825 | { |
826 | if (debug_threads) | |
827 | { | |
828 | struct thread_info *thr = get_lwp_thread (lwp); | |
829 | ||
830 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
831 | target_pid_to_str (ptid_of (thr))); | |
832 | } | |
833 | ||
834 | /* Back up the PC if necessary. */ | |
835 | if (pc != sw_breakpoint_pc) | |
e7ad2f14 | 836 | { |
582511be PA |
837 | struct regcache *regcache |
838 | = get_thread_regcache (current_thread, 1); | |
839 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
840 | } | |
841 | ||
e7ad2f14 PA |
842 | /* Update this so we record the correct stop PC below. */ |
843 | pc = sw_breakpoint_pc; | |
582511be | 844 | } |
e7ad2f14 | 845 | else if (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) |
582511be PA |
846 | { |
847 | if (debug_threads) | |
848 | { | |
849 | struct thread_info *thr = get_lwp_thread (lwp); | |
850 | ||
851 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
852 | target_pid_to_str (ptid_of (thr))); | |
853 | } | |
e7ad2f14 PA |
854 | } |
855 | else if (lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) | |
856 | { | |
857 | if (debug_threads) | |
858 | { | |
859 | struct thread_info *thr = get_lwp_thread (lwp); | |
47c0c975 | 860 | |
e7ad2f14 PA |
861 | debug_printf ("CSBB: %s stopped by hardware watchpoint\n", |
862 | target_pid_to_str (ptid_of (thr))); | |
863 | } | |
582511be | 864 | } |
e7ad2f14 PA |
865 | else if (lwp->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) |
866 | { | |
867 | if (debug_threads) | |
868 | { | |
869 | struct thread_info *thr = get_lwp_thread (lwp); | |
582511be | 870 | |
e7ad2f14 PA |
871 | debug_printf ("CSBB: %s stopped by trace\n", |
872 | target_pid_to_str (ptid_of (thr))); | |
873 | } | |
874 | } | |
875 | ||
876 | lwp->stop_pc = pc; | |
582511be | 877 | current_thread = saved_thread; |
e7ad2f14 | 878 | return 1; |
0d62e5e8 | 879 | } |
ce3a066d | 880 | |
b3312d80 | 881 | static struct lwp_info * |
95954743 | 882 | add_lwp (ptid_t ptid) |
611cb4a5 | 883 | { |
54a0b537 | 884 | struct lwp_info *lwp; |
0d62e5e8 | 885 | |
8d749320 | 886 | lwp = XCNEW (struct lwp_info); |
00db26fa PA |
887 | |
888 | lwp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
0d62e5e8 | 889 | |
aa5ca48f | 890 | if (the_low_target.new_thread != NULL) |
34c703da | 891 | the_low_target.new_thread (lwp); |
aa5ca48f | 892 | |
f7667f0d | 893 | lwp->thread = add_thread (ptid, lwp); |
0d62e5e8 | 894 | |
54a0b537 | 895 | return lwp; |
0d62e5e8 | 896 | } |
611cb4a5 | 897 | |
da6d8c04 DJ |
898 | /* Start an inferior process and returns its pid. |
899 | ALLARGS is a vector of program-name and args. */ | |
900 | ||
ce3a066d DJ |
901 | static int |
902 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 903 | { |
a6dbe5df | 904 | struct lwp_info *new_lwp; |
da6d8c04 | 905 | int pid; |
95954743 | 906 | ptid_t ptid; |
8cc73a39 SDJ |
907 | struct cleanup *restore_personality |
908 | = maybe_disable_address_space_randomization (disable_randomization); | |
03583c20 | 909 | |
42c81e2a | 910 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
911 | pid = vfork (); |
912 | #else | |
da6d8c04 | 913 | pid = fork (); |
52fb6437 | 914 | #endif |
da6d8c04 DJ |
915 | if (pid < 0) |
916 | perror_with_name ("fork"); | |
917 | ||
918 | if (pid == 0) | |
919 | { | |
602e3198 | 920 | close_most_fds (); |
b8e1b30e | 921 | ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da6d8c04 | 922 | |
a9fa9f7d DJ |
923 | setpgid (0, 0); |
924 | ||
e0f9f062 DE |
925 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
926 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
927 | Also, redirect stdin to /dev/null. */ | |
928 | if (remote_connection_is_stdio ()) | |
929 | { | |
930 | close (0); | |
931 | open ("/dev/null", O_RDONLY); | |
932 | dup2 (2, 1); | |
3e52c33d JK |
933 | if (write (2, "stdin/stdout redirected\n", |
934 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
935 | { |
936 | /* Errors ignored. */; | |
937 | } | |
e0f9f062 DE |
938 | } |
939 | ||
2b876972 DJ |
940 | execv (program, allargs); |
941 | if (errno == ENOENT) | |
942 | execvp (program, allargs); | |
da6d8c04 DJ |
943 | |
944 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 945 | strerror (errno)); |
da6d8c04 DJ |
946 | fflush (stderr); |
947 | _exit (0177); | |
948 | } | |
949 | ||
8cc73a39 | 950 | do_cleanups (restore_personality); |
03583c20 | 951 | |
55d7b841 | 952 | linux_add_process (pid, 0); |
95954743 PA |
953 | |
954 | ptid = ptid_build (pid, pid, 0); | |
955 | new_lwp = add_lwp (ptid); | |
a6dbe5df | 956 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 957 | |
a9fa9f7d | 958 | return pid; |
da6d8c04 DJ |
959 | } |
960 | ||
ece66d65 JS |
961 | /* Implement the post_create_inferior target_ops method. */ |
962 | ||
963 | static void | |
964 | linux_post_create_inferior (void) | |
965 | { | |
966 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
967 | ||
968 | linux_arch_setup (); | |
969 | ||
970 | if (lwp->must_set_ptrace_flags) | |
971 | { | |
972 | struct process_info *proc = current_process (); | |
973 | int options = linux_low_ptrace_options (proc->attached); | |
974 | ||
975 | linux_enable_event_reporting (lwpid_of (current_thread), options); | |
976 | lwp->must_set_ptrace_flags = 0; | |
977 | } | |
978 | } | |
979 | ||
8784d563 PA |
980 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
981 | error. */ | |
da6d8c04 | 982 | |
7ae1a6a6 PA |
983 | int |
984 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 985 | { |
54a0b537 | 986 | struct lwp_info *new_lwp; |
7ae1a6a6 | 987 | int lwpid = ptid_get_lwp (ptid); |
611cb4a5 | 988 | |
b8e1b30e | 989 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 990 | != 0) |
7ae1a6a6 | 991 | return errno; |
24a09b5f | 992 | |
b3312d80 | 993 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 994 | |
a6dbe5df PA |
995 | /* We need to wait for SIGSTOP before being able to make the next |
996 | ptrace call on this LWP. */ | |
997 | new_lwp->must_set_ptrace_flags = 1; | |
998 | ||
644cebc9 | 999 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
1000 | { |
1001 | if (debug_threads) | |
87ce2a04 | 1002 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
1003 | |
1004 | /* The process is definitely stopped. It is in a job control | |
1005 | stop, unless the kernel predates the TASK_STOPPED / | |
1006 | TASK_TRACED distinction, in which case it might be in a | |
1007 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1008 | can kill it, signal it, et cetera. | |
1009 | ||
1010 | First make sure there is a pending SIGSTOP. Since we are | |
1011 | already attached, the process can not transition from stopped | |
1012 | to running without a PTRACE_CONT; so we know this signal will | |
1013 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1014 | probably already in the queue (unless this kernel is old | |
1015 | enough to use TASK_STOPPED for ptrace stops); but since | |
1016 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
1017 | kill_lwp (lwpid, SIGSTOP); | |
1018 | ||
1019 | /* Finally, resume the stopped process. This will deliver the | |
1020 | SIGSTOP (or a higher priority signal, just like normal | |
1021 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 1022 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
1023 | } |
1024 | ||
0d62e5e8 | 1025 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
1026 | brings it to a halt. |
1027 | ||
1028 | There are several cases to consider here: | |
1029 | ||
1030 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 1031 | of a new thread that is being created. |
d50171e4 PA |
1032 | In this case we should ignore that SIGSTOP and resume the |
1033 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 1034 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 1035 | resume_continue. |
0e21c1ec DE |
1036 | |
1037 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
1038 | to it via attach_inferior. |
1039 | In this case we want the process thread to stop. | |
d50171e4 PA |
1040 | This is handled by having linux_attach set last_resume_kind == |
1041 | resume_stop after we return. | |
e3deef73 LM |
1042 | |
1043 | If the pid we are attaching to is also the tgid, we attach to and | |
1044 | stop all the existing threads. Otherwise, we attach to pid and | |
1045 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
1046 | |
1047 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
1048 | existing threads. |
1049 | In this case we want the thread to stop. | |
1050 | FIXME: This case is currently not properly handled. | |
1051 | We should wait for the SIGSTOP but don't. Things work apparently | |
1052 | because enough time passes between when we ptrace (ATTACH) and when | |
1053 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
1054 | |
1055 | On the other hand, if we are currently trying to stop all threads, we | |
1056 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 1057 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
1058 | end of the list, and so the new thread has not yet reached |
1059 | wait_for_sigstop (but will). */ | |
d50171e4 | 1060 | new_lwp->stop_expected = 1; |
0d62e5e8 | 1061 | |
7ae1a6a6 | 1062 | return 0; |
95954743 PA |
1063 | } |
1064 | ||
8784d563 PA |
1065 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
1066 | already attached. Returns true if a new LWP is found, false | |
1067 | otherwise. */ | |
1068 | ||
1069 | static int | |
1070 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1071 | { | |
1072 | /* Is this a new thread? */ | |
1073 | if (find_thread_ptid (ptid) == NULL) | |
1074 | { | |
1075 | int lwpid = ptid_get_lwp (ptid); | |
1076 | int err; | |
1077 | ||
1078 | if (debug_threads) | |
1079 | debug_printf ("Found new lwp %d\n", lwpid); | |
1080 | ||
1081 | err = linux_attach_lwp (ptid); | |
1082 | ||
1083 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
1084 | is returned if the thread's task still exists, and is marked | |
1085 | as exited or zombie, as well as other conditions, so in that | |
1086 | case, confirm the status in /proc/PID/status. */ | |
1087 | if (err == ESRCH | |
1088 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
1089 | { | |
1090 | if (debug_threads) | |
1091 | { | |
1092 | debug_printf ("Cannot attach to lwp %d: " | |
1093 | "thread is gone (%d: %s)\n", | |
1094 | lwpid, err, strerror (err)); | |
1095 | } | |
1096 | } | |
1097 | else if (err != 0) | |
1098 | { | |
1099 | warning (_("Cannot attach to lwp %d: %s"), | |
1100 | lwpid, | |
1101 | linux_ptrace_attach_fail_reason_string (ptid, err)); | |
1102 | } | |
1103 | ||
1104 | return 1; | |
1105 | } | |
1106 | return 0; | |
1107 | } | |
1108 | ||
500c1d85 PA |
1109 | static void async_file_mark (void); |
1110 | ||
e3deef73 LM |
1111 | /* Attach to PID. If PID is the tgid, attach to it and all |
1112 | of its threads. */ | |
1113 | ||
c52daf70 | 1114 | static int |
a1928bad | 1115 | linux_attach (unsigned long pid) |
0d62e5e8 | 1116 | { |
500c1d85 PA |
1117 | struct process_info *proc; |
1118 | struct thread_info *initial_thread; | |
7ae1a6a6 PA |
1119 | ptid_t ptid = ptid_build (pid, pid, 0); |
1120 | int err; | |
1121 | ||
e3deef73 LM |
1122 | /* Attach to PID. We will check for other threads |
1123 | soon. */ | |
7ae1a6a6 PA |
1124 | err = linux_attach_lwp (ptid); |
1125 | if (err != 0) | |
1126 | error ("Cannot attach to process %ld: %s", | |
8784d563 | 1127 | pid, linux_ptrace_attach_fail_reason_string (ptid, err)); |
7ae1a6a6 | 1128 | |
500c1d85 | 1129 | proc = linux_add_process (pid, 1); |
0d62e5e8 | 1130 | |
500c1d85 PA |
1131 | /* Don't ignore the initial SIGSTOP if we just attached to this |
1132 | process. It will be collected by wait shortly. */ | |
1133 | initial_thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
1134 | initial_thread->last_resume_kind = resume_stop; | |
0d62e5e8 | 1135 | |
8784d563 PA |
1136 | /* We must attach to every LWP. If /proc is mounted, use that to |
1137 | find them now. On the one hand, the inferior may be using raw | |
1138 | clone instead of using pthreads. On the other hand, even if it | |
1139 | is using pthreads, GDB may not be connected yet (thread_db needs | |
1140 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
1141 | structures in the inferior's address space to find the list of | |
1142 | threads/LWPs, and those structures may well be corrupted. Note | |
1143 | that once thread_db is loaded, we'll still use it to list threads | |
1144 | and associate pthread info with each LWP. */ | |
1145 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
500c1d85 PA |
1146 | |
1147 | /* GDB will shortly read the xml target description for this | |
1148 | process, to figure out the process' architecture. But the target | |
1149 | description is only filled in when the first process/thread in | |
1150 | the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do | |
1151 | that now, otherwise, if GDB is fast enough, it could read the | |
1152 | target description _before_ that initial stop. */ | |
1153 | if (non_stop) | |
1154 | { | |
1155 | struct lwp_info *lwp; | |
1156 | int wstat, lwpid; | |
1157 | ptid_t pid_ptid = pid_to_ptid (pid); | |
1158 | ||
1159 | lwpid = linux_wait_for_event_filtered (pid_ptid, pid_ptid, | |
1160 | &wstat, __WALL); | |
1161 | gdb_assert (lwpid > 0); | |
1162 | ||
1163 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); | |
1164 | ||
1165 | if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGSTOP) | |
1166 | { | |
1167 | lwp->status_pending_p = 1; | |
1168 | lwp->status_pending = wstat; | |
1169 | } | |
1170 | ||
1171 | initial_thread->last_resume_kind = resume_continue; | |
1172 | ||
1173 | async_file_mark (); | |
1174 | ||
1175 | gdb_assert (proc->tdesc != NULL); | |
1176 | } | |
1177 | ||
95954743 PA |
1178 | return 0; |
1179 | } | |
1180 | ||
1181 | struct counter | |
1182 | { | |
1183 | int pid; | |
1184 | int count; | |
1185 | }; | |
1186 | ||
1187 | static int | |
1188 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
1189 | { | |
9a3c8263 | 1190 | struct counter *counter = (struct counter *) args; |
95954743 PA |
1191 | |
1192 | if (ptid_get_pid (entry->id) == counter->pid) | |
1193 | { | |
1194 | if (++counter->count > 1) | |
1195 | return 1; | |
1196 | } | |
d61ddec4 | 1197 | |
da6d8c04 DJ |
1198 | return 0; |
1199 | } | |
1200 | ||
95954743 | 1201 | static int |
fa96cb38 | 1202 | last_thread_of_process_p (int pid) |
95954743 | 1203 | { |
95954743 | 1204 | struct counter counter = { pid , 0 }; |
da6d8c04 | 1205 | |
95954743 PA |
1206 | return (find_inferior (&all_threads, |
1207 | second_thread_of_pid_p, &counter) == NULL); | |
1208 | } | |
1209 | ||
da84f473 PA |
1210 | /* Kill LWP. */ |
1211 | ||
1212 | static void | |
1213 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1214 | { | |
d86d4aaf DE |
1215 | struct thread_info *thr = get_lwp_thread (lwp); |
1216 | int pid = lwpid_of (thr); | |
da84f473 PA |
1217 | |
1218 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1219 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1220 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1221 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1222 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1223 | per process, not one for each thread. But since we still support | |
4a6ed09b PA |
1224 | support debugging programs using raw clone without CLONE_THREAD, |
1225 | we send one for each thread. For years, we used PTRACE_KILL | |
1226 | only, so we're being a bit paranoid about some old kernels where | |
1227 | PTRACE_KILL might work better (dubious if there are any such, but | |
1228 | that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL | |
1229 | second, and so we're fine everywhere. */ | |
da84f473 PA |
1230 | |
1231 | errno = 0; | |
69ff6be5 | 1232 | kill_lwp (pid, SIGKILL); |
da84f473 | 1233 | if (debug_threads) |
ce9e3fe7 PA |
1234 | { |
1235 | int save_errno = errno; | |
1236 | ||
1237 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
1238 | target_pid_to_str (ptid_of (thr)), | |
1239 | save_errno ? strerror (save_errno) : "OK"); | |
1240 | } | |
da84f473 PA |
1241 | |
1242 | errno = 0; | |
b8e1b30e | 1243 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1244 | if (debug_threads) |
ce9e3fe7 PA |
1245 | { |
1246 | int save_errno = errno; | |
1247 | ||
1248 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
1249 | target_pid_to_str (ptid_of (thr)), | |
1250 | save_errno ? strerror (save_errno) : "OK"); | |
1251 | } | |
da84f473 PA |
1252 | } |
1253 | ||
e76126e8 PA |
1254 | /* Kill LWP and wait for it to die. */ |
1255 | ||
1256 | static void | |
1257 | kill_wait_lwp (struct lwp_info *lwp) | |
1258 | { | |
1259 | struct thread_info *thr = get_lwp_thread (lwp); | |
1260 | int pid = ptid_get_pid (ptid_of (thr)); | |
1261 | int lwpid = ptid_get_lwp (ptid_of (thr)); | |
1262 | int wstat; | |
1263 | int res; | |
1264 | ||
1265 | if (debug_threads) | |
1266 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
1267 | ||
1268 | do | |
1269 | { | |
1270 | linux_kill_one_lwp (lwp); | |
1271 | ||
1272 | /* Make sure it died. Notes: | |
1273 | ||
1274 | - The loop is most likely unnecessary. | |
1275 | ||
1276 | - We don't use linux_wait_for_event as that could delete lwps | |
1277 | while we're iterating over them. We're not interested in | |
1278 | any pending status at this point, only in making sure all | |
1279 | wait status on the kernel side are collected until the | |
1280 | process is reaped. | |
1281 | ||
1282 | - We don't use __WALL here as the __WALL emulation relies on | |
1283 | SIGCHLD, and killing a stopped process doesn't generate | |
1284 | one, nor an exit status. | |
1285 | */ | |
1286 | res = my_waitpid (lwpid, &wstat, 0); | |
1287 | if (res == -1 && errno == ECHILD) | |
1288 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1289 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1290 | ||
586b02a9 PA |
1291 | /* Even if it was stopped, the child may have already disappeared. |
1292 | E.g., if it was killed by SIGKILL. */ | |
1293 | if (res < 0 && errno != ECHILD) | |
1294 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1295 | } |
1296 | ||
da84f473 PA |
1297 | /* Callback for `find_inferior'. Kills an lwp of a given process, |
1298 | except the leader. */ | |
95954743 PA |
1299 | |
1300 | static int | |
da84f473 | 1301 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 1302 | { |
0d62e5e8 | 1303 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 1304 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
1305 | int pid = * (int *) args; |
1306 | ||
1307 | if (ptid_get_pid (entry->id) != pid) | |
1308 | return 0; | |
0d62e5e8 | 1309 | |
fd500816 DJ |
1310 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1311 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1312 | the children get a chance to be reaped, it will remain a zombie | |
1313 | forever. */ | |
95954743 | 1314 | |
d86d4aaf | 1315 | if (lwpid_of (thread) == pid) |
95954743 PA |
1316 | { |
1317 | if (debug_threads) | |
87ce2a04 DE |
1318 | debug_printf ("lkop: is last of process %s\n", |
1319 | target_pid_to_str (entry->id)); | |
95954743 PA |
1320 | return 0; |
1321 | } | |
fd500816 | 1322 | |
e76126e8 | 1323 | kill_wait_lwp (lwp); |
95954743 | 1324 | return 0; |
da6d8c04 DJ |
1325 | } |
1326 | ||
95954743 PA |
1327 | static int |
1328 | linux_kill (int pid) | |
0d62e5e8 | 1329 | { |
95954743 | 1330 | struct process_info *process; |
54a0b537 | 1331 | struct lwp_info *lwp; |
fd500816 | 1332 | |
95954743 PA |
1333 | process = find_process_pid (pid); |
1334 | if (process == NULL) | |
1335 | return -1; | |
9d606399 | 1336 | |
f9e39928 PA |
1337 | /* If we're killing a running inferior, make sure it is stopped |
1338 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1339 | stop_all_lwps (0, NULL); |
f9e39928 | 1340 | |
da84f473 | 1341 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1342 | |
54a0b537 | 1343 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1344 | thread in the list, so do so now. */ |
95954743 | 1345 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1346 | |
784867a5 | 1347 | if (lwp == NULL) |
fd500816 | 1348 | { |
784867a5 | 1349 | if (debug_threads) |
d86d4aaf DE |
1350 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1351 | pid); | |
784867a5 JK |
1352 | } |
1353 | else | |
e76126e8 | 1354 | kill_wait_lwp (lwp); |
2d717e4f | 1355 | |
8336d594 | 1356 | the_target->mourn (process); |
f9e39928 PA |
1357 | |
1358 | /* Since we presently can only stop all lwps of all processes, we | |
1359 | need to unstop lwps of other processes. */ | |
7984d532 | 1360 | unstop_all_lwps (0, NULL); |
95954743 | 1361 | return 0; |
0d62e5e8 DJ |
1362 | } |
1363 | ||
9b224c5e PA |
1364 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1365 | signal the thread last stopped for, which we need to deliver to the | |
1366 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1367 | ||
1368 | static int | |
1369 | get_detach_signal (struct thread_info *thread) | |
1370 | { | |
a493e3e2 | 1371 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1372 | int status; |
1373 | struct lwp_info *lp = get_thread_lwp (thread); | |
1374 | ||
1375 | if (lp->status_pending_p) | |
1376 | status = lp->status_pending; | |
1377 | else | |
1378 | { | |
1379 | /* If the thread had been suspended by gdbserver, and it stopped | |
1380 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1381 | want to deliver that SIGSTOP. */ | |
1382 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1383 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1384 | return 0; |
1385 | ||
1386 | /* Otherwise, we may need to deliver the signal we | |
1387 | intercepted. */ | |
1388 | status = lp->last_status; | |
1389 | } | |
1390 | ||
1391 | if (!WIFSTOPPED (status)) | |
1392 | { | |
1393 | if (debug_threads) | |
87ce2a04 | 1394 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1395 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1396 | return 0; |
1397 | } | |
1398 | ||
1399 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1400 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1401 | { |
1402 | if (debug_threads) | |
87ce2a04 DE |
1403 | debug_printf ("GPS: lwp %s had stopped with extended " |
1404 | "status: no pending signal\n", | |
d86d4aaf | 1405 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1406 | return 0; |
1407 | } | |
1408 | ||
2ea28649 | 1409 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1410 | |
1411 | if (program_signals_p && !program_signals[signo]) | |
1412 | { | |
1413 | if (debug_threads) | |
87ce2a04 | 1414 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1415 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1416 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1417 | return 0; |
1418 | } | |
1419 | else if (!program_signals_p | |
1420 | /* If we have no way to know which signals GDB does not | |
1421 | want to have passed to the program, assume | |
1422 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1423 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1424 | { |
1425 | if (debug_threads) | |
87ce2a04 DE |
1426 | debug_printf ("GPS: lwp %s had signal %s, " |
1427 | "but we don't know if we should pass it. " | |
1428 | "Default to not.\n", | |
d86d4aaf | 1429 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1430 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1431 | return 0; |
1432 | } | |
1433 | else | |
1434 | { | |
1435 | if (debug_threads) | |
87ce2a04 | 1436 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1437 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1438 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1439 | |
1440 | return WSTOPSIG (status); | |
1441 | } | |
1442 | } | |
1443 | ||
95954743 PA |
1444 | static int |
1445 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1446 | { |
1447 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1448 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1449 | int pid = * (int *) args; |
9b224c5e | 1450 | int sig; |
95954743 PA |
1451 | |
1452 | if (ptid_get_pid (entry->id) != pid) | |
1453 | return 0; | |
6ad8ae5c | 1454 | |
9b224c5e | 1455 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1456 | if (lwp->stop_expected) |
ae13219e | 1457 | { |
9b224c5e | 1458 | if (debug_threads) |
87ce2a04 | 1459 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1460 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1461 | |
d86d4aaf | 1462 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1463 | lwp->stop_expected = 0; |
ae13219e DJ |
1464 | } |
1465 | ||
1466 | /* Flush any pending changes to the process's registers. */ | |
d86d4aaf | 1467 | regcache_invalidate_thread (thread); |
ae13219e | 1468 | |
9b224c5e PA |
1469 | /* Pass on any pending signal for this thread. */ |
1470 | sig = get_detach_signal (thread); | |
1471 | ||
ae13219e | 1472 | /* Finally, let it resume. */ |
82bfbe7e PA |
1473 | if (the_low_target.prepare_to_resume != NULL) |
1474 | the_low_target.prepare_to_resume (lwp); | |
d86d4aaf | 1475 | if (ptrace (PTRACE_DETACH, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
b8e1b30e | 1476 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
9b224c5e | 1477 | error (_("Can't detach %s: %s"), |
d86d4aaf | 1478 | target_pid_to_str (ptid_of (thread)), |
9b224c5e | 1479 | strerror (errno)); |
bd99dc85 PA |
1480 | |
1481 | delete_lwp (lwp); | |
95954743 | 1482 | return 0; |
6ad8ae5c DJ |
1483 | } |
1484 | ||
95954743 PA |
1485 | static int |
1486 | linux_detach (int pid) | |
1487 | { | |
1488 | struct process_info *process; | |
1489 | ||
1490 | process = find_process_pid (pid); | |
1491 | if (process == NULL) | |
1492 | return -1; | |
1493 | ||
863d01bd PA |
1494 | /* As there's a step over already in progress, let it finish first, |
1495 | otherwise nesting a stabilize_threads operation on top gets real | |
1496 | messy. */ | |
1497 | complete_ongoing_step_over (); | |
1498 | ||
f9e39928 PA |
1499 | /* Stop all threads before detaching. First, ptrace requires that |
1500 | the thread is stopped to sucessfully detach. Second, thread_db | |
1501 | may need to uninstall thread event breakpoints from memory, which | |
1502 | only works with a stopped process anyway. */ | |
7984d532 | 1503 | stop_all_lwps (0, NULL); |
f9e39928 | 1504 | |
ca5c370d | 1505 | #ifdef USE_THREAD_DB |
8336d594 | 1506 | thread_db_detach (process); |
ca5c370d PA |
1507 | #endif |
1508 | ||
fa593d66 PA |
1509 | /* Stabilize threads (move out of jump pads). */ |
1510 | stabilize_threads (); | |
1511 | ||
95954743 | 1512 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1513 | |
1514 | the_target->mourn (process); | |
f9e39928 PA |
1515 | |
1516 | /* Since we presently can only stop all lwps of all processes, we | |
1517 | need to unstop lwps of other processes. */ | |
7984d532 | 1518 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1519 | return 0; |
1520 | } | |
1521 | ||
1522 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1523 | ||
1524 | static int | |
1525 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1526 | { | |
d86d4aaf DE |
1527 | struct thread_info *thread = (struct thread_info *) entry; |
1528 | struct lwp_info *lwp = get_thread_lwp (thread); | |
9a3c8263 | 1529 | struct process_info *process = (struct process_info *) proc; |
f9e39928 | 1530 | |
d86d4aaf | 1531 | if (pid_of (thread) == pid_of (process)) |
f9e39928 PA |
1532 | delete_lwp (lwp); |
1533 | ||
dd6953e1 | 1534 | return 0; |
6ad8ae5c DJ |
1535 | } |
1536 | ||
8336d594 PA |
1537 | static void |
1538 | linux_mourn (struct process_info *process) | |
1539 | { | |
1540 | struct process_info_private *priv; | |
1541 | ||
1542 | #ifdef USE_THREAD_DB | |
1543 | thread_db_mourn (process); | |
1544 | #endif | |
1545 | ||
d86d4aaf | 1546 | find_inferior (&all_threads, delete_lwp_callback, process); |
f9e39928 | 1547 | |
8336d594 | 1548 | /* Freeing all private data. */ |
fe978cb0 | 1549 | priv = process->priv; |
8336d594 PA |
1550 | free (priv->arch_private); |
1551 | free (priv); | |
fe978cb0 | 1552 | process->priv = NULL; |
505106cd PA |
1553 | |
1554 | remove_process (process); | |
8336d594 PA |
1555 | } |
1556 | ||
444d6139 | 1557 | static void |
95954743 | 1558 | linux_join (int pid) |
444d6139 | 1559 | { |
444d6139 PA |
1560 | int status, ret; |
1561 | ||
1562 | do { | |
95954743 | 1563 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1564 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1565 | break; | |
1566 | } while (ret != -1 || errno != ECHILD); | |
1567 | } | |
1568 | ||
6ad8ae5c | 1569 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1570 | static int |
95954743 | 1571 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1572 | { |
95954743 PA |
1573 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1574 | ||
1575 | /* We assume we always know if a thread exits. If a whole process | |
1576 | exited but we still haven't been able to report it to GDB, we'll | |
1577 | hold on to the last lwp of the dead process. */ | |
1578 | if (lwp != NULL) | |
00db26fa | 1579 | return !lwp_is_marked_dead (lwp); |
0d62e5e8 DJ |
1580 | else |
1581 | return 0; | |
1582 | } | |
1583 | ||
582511be PA |
1584 | /* Return 1 if this lwp still has an interesting status pending. If |
1585 | not (e.g., it had stopped for a breakpoint that is gone), return | |
1586 | false. */ | |
1587 | ||
1588 | static int | |
1589 | thread_still_has_status_pending_p (struct thread_info *thread) | |
1590 | { | |
1591 | struct lwp_info *lp = get_thread_lwp (thread); | |
1592 | ||
1593 | if (!lp->status_pending_p) | |
1594 | return 0; | |
1595 | ||
582511be | 1596 | if (thread->last_resume_kind != resume_stop |
15c66dd6 PA |
1597 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1598 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1599 | { |
1600 | struct thread_info *saved_thread; | |
1601 | CORE_ADDR pc; | |
1602 | int discard = 0; | |
1603 | ||
1604 | gdb_assert (lp->last_status != 0); | |
1605 | ||
1606 | pc = get_pc (lp); | |
1607 | ||
1608 | saved_thread = current_thread; | |
1609 | current_thread = thread; | |
1610 | ||
1611 | if (pc != lp->stop_pc) | |
1612 | { | |
1613 | if (debug_threads) | |
1614 | debug_printf ("PC of %ld changed\n", | |
1615 | lwpid_of (thread)); | |
1616 | discard = 1; | |
1617 | } | |
3e572f71 PA |
1618 | |
1619 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1620 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
582511be PA |
1621 | && !(*the_low_target.breakpoint_at) (pc)) |
1622 | { | |
1623 | if (debug_threads) | |
1624 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1625 | lwpid_of (thread)); | |
1626 | discard = 1; | |
1627 | } | |
15c66dd6 | 1628 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1629 | && !hardware_breakpoint_inserted_here (pc)) |
1630 | { | |
1631 | if (debug_threads) | |
1632 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1633 | lwpid_of (thread)); | |
1634 | discard = 1; | |
1635 | } | |
3e572f71 | 1636 | #endif |
582511be PA |
1637 | |
1638 | current_thread = saved_thread; | |
1639 | ||
1640 | if (discard) | |
1641 | { | |
1642 | if (debug_threads) | |
1643 | debug_printf ("discarding pending breakpoint status\n"); | |
1644 | lp->status_pending_p = 0; | |
1645 | return 0; | |
1646 | } | |
1647 | } | |
1648 | ||
1649 | return 1; | |
1650 | } | |
1651 | ||
a681f9c9 PA |
1652 | /* Returns true if LWP is resumed from the client's perspective. */ |
1653 | ||
1654 | static int | |
1655 | lwp_resumed (struct lwp_info *lwp) | |
1656 | { | |
1657 | struct thread_info *thread = get_lwp_thread (lwp); | |
1658 | ||
1659 | if (thread->last_resume_kind != resume_stop) | |
1660 | return 1; | |
1661 | ||
1662 | /* Did gdb send us a `vCont;t', but we haven't reported the | |
1663 | corresponding stop to gdb yet? If so, the thread is still | |
1664 | resumed/running from gdb's perspective. */ | |
1665 | if (thread->last_resume_kind == resume_stop | |
1666 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
1667 | return 1; | |
1668 | ||
1669 | return 0; | |
1670 | } | |
1671 | ||
6bf5e0ba | 1672 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1673 | static int |
d50171e4 | 1674 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1675 | { |
d86d4aaf | 1676 | struct thread_info *thread = (struct thread_info *) entry; |
582511be | 1677 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1678 | ptid_t ptid = * (ptid_t *) arg; |
1679 | ||
1680 | /* Check if we're only interested in events from a specific process | |
afa8d396 PA |
1681 | or a specific LWP. */ |
1682 | if (!ptid_match (ptid_of (thread), ptid)) | |
95954743 | 1683 | return 0; |
0d62e5e8 | 1684 | |
a681f9c9 PA |
1685 | if (!lwp_resumed (lp)) |
1686 | return 0; | |
1687 | ||
582511be PA |
1688 | if (lp->status_pending_p |
1689 | && !thread_still_has_status_pending_p (thread)) | |
1690 | { | |
1691 | linux_resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); | |
1692 | return 0; | |
1693 | } | |
0d62e5e8 | 1694 | |
582511be | 1695 | return lp->status_pending_p; |
0d62e5e8 DJ |
1696 | } |
1697 | ||
95954743 PA |
1698 | static int |
1699 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1700 | { | |
1701 | ptid_t ptid = *(ptid_t *) data; | |
1702 | int lwp; | |
1703 | ||
1704 | if (ptid_get_lwp (ptid) != 0) | |
1705 | lwp = ptid_get_lwp (ptid); | |
1706 | else | |
1707 | lwp = ptid_get_pid (ptid); | |
1708 | ||
1709 | if (ptid_get_lwp (entry->id) == lwp) | |
1710 | return 1; | |
1711 | ||
1712 | return 0; | |
1713 | } | |
1714 | ||
1715 | struct lwp_info * | |
1716 | find_lwp_pid (ptid_t ptid) | |
1717 | { | |
d86d4aaf DE |
1718 | struct inferior_list_entry *thread |
1719 | = find_inferior (&all_threads, same_lwp, &ptid); | |
1720 | ||
1721 | if (thread == NULL) | |
1722 | return NULL; | |
1723 | ||
1724 | return get_thread_lwp ((struct thread_info *) thread); | |
95954743 PA |
1725 | } |
1726 | ||
fa96cb38 | 1727 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1728 | |
fa96cb38 PA |
1729 | static int |
1730 | num_lwps (int pid) | |
1731 | { | |
1732 | struct inferior_list_entry *inf, *tmp; | |
1733 | int count = 0; | |
0d62e5e8 | 1734 | |
fa96cb38 | 1735 | ALL_INFERIORS (&all_threads, inf, tmp) |
24a09b5f | 1736 | { |
fa96cb38 PA |
1737 | if (ptid_get_pid (inf->id) == pid) |
1738 | count++; | |
24a09b5f | 1739 | } |
3aee8918 | 1740 | |
fa96cb38 PA |
1741 | return count; |
1742 | } | |
d61ddec4 | 1743 | |
6d4ee8c6 GB |
1744 | /* The arguments passed to iterate_over_lwps. */ |
1745 | ||
1746 | struct iterate_over_lwps_args | |
1747 | { | |
1748 | /* The FILTER argument passed to iterate_over_lwps. */ | |
1749 | ptid_t filter; | |
1750 | ||
1751 | /* The CALLBACK argument passed to iterate_over_lwps. */ | |
1752 | iterate_over_lwps_ftype *callback; | |
1753 | ||
1754 | /* The DATA argument passed to iterate_over_lwps. */ | |
1755 | void *data; | |
1756 | }; | |
1757 | ||
1758 | /* Callback for find_inferior used by iterate_over_lwps to filter | |
1759 | calls to the callback supplied to that function. Returning a | |
1760 | nonzero value causes find_inferiors to stop iterating and return | |
1761 | the current inferior_list_entry. Returning zero indicates that | |
1762 | find_inferiors should continue iterating. */ | |
1763 | ||
1764 | static int | |
1765 | iterate_over_lwps_filter (struct inferior_list_entry *entry, void *args_p) | |
1766 | { | |
1767 | struct iterate_over_lwps_args *args | |
1768 | = (struct iterate_over_lwps_args *) args_p; | |
1769 | ||
1770 | if (ptid_match (entry->id, args->filter)) | |
1771 | { | |
1772 | struct thread_info *thr = (struct thread_info *) entry; | |
1773 | struct lwp_info *lwp = get_thread_lwp (thr); | |
1774 | ||
1775 | return (*args->callback) (lwp, args->data); | |
1776 | } | |
1777 | ||
1778 | return 0; | |
1779 | } | |
1780 | ||
1781 | /* See nat/linux-nat.h. */ | |
1782 | ||
1783 | struct lwp_info * | |
1784 | iterate_over_lwps (ptid_t filter, | |
1785 | iterate_over_lwps_ftype callback, | |
1786 | void *data) | |
1787 | { | |
1788 | struct iterate_over_lwps_args args = {filter, callback, data}; | |
1789 | struct inferior_list_entry *entry; | |
1790 | ||
1791 | entry = find_inferior (&all_threads, iterate_over_lwps_filter, &args); | |
1792 | if (entry == NULL) | |
1793 | return NULL; | |
1794 | ||
1795 | return get_thread_lwp ((struct thread_info *) entry); | |
1796 | } | |
1797 | ||
fa96cb38 PA |
1798 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1799 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1800 | |
fa96cb38 PA |
1801 | static void |
1802 | check_zombie_leaders (void) | |
1803 | { | |
1804 | struct process_info *proc, *tmp; | |
c3adc08c | 1805 | |
fa96cb38 | 1806 | ALL_PROCESSES (proc, tmp) |
c3adc08c | 1807 | { |
fa96cb38 PA |
1808 | pid_t leader_pid = pid_of (proc); |
1809 | struct lwp_info *leader_lp; | |
c3adc08c | 1810 | |
fa96cb38 | 1811 | leader_lp = find_lwp_pid (pid_to_ptid (leader_pid)); |
c3adc08c | 1812 | |
fa96cb38 PA |
1813 | if (debug_threads) |
1814 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1815 | "num_lwps=%d, zombie=%d\n", | |
1816 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1817 | linux_proc_pid_is_zombie (leader_pid)); | |
1818 | ||
94585166 | 1819 | if (leader_lp != NULL && !leader_lp->stopped |
fa96cb38 PA |
1820 | /* Check if there are other threads in the group, as we may |
1821 | have raced with the inferior simply exiting. */ | |
1822 | && !last_thread_of_process_p (leader_pid) | |
1823 | && linux_proc_pid_is_zombie (leader_pid)) | |
1824 | { | |
1825 | /* A leader zombie can mean one of two things: | |
1826 | ||
1827 | - It exited, and there's an exit status pending | |
1828 | available, or only the leader exited (not the whole | |
1829 | program). In the latter case, we can't waitpid the | |
1830 | leader's exit status until all other threads are gone. | |
1831 | ||
1832 | - There are 3 or more threads in the group, and a thread | |
1833 | other than the leader exec'd. On an exec, the Linux | |
1834 | kernel destroys all other threads (except the execing | |
1835 | one) in the thread group, and resets the execing thread's | |
1836 | tid to the tgid. No exit notification is sent for the | |
1837 | execing thread -- from the ptracer's perspective, it | |
1838 | appears as though the execing thread just vanishes. | |
1839 | Until we reap all other threads except the leader and the | |
1840 | execing thread, the leader will be zombie, and the | |
1841 | execing thread will be in `D (disc sleep)'. As soon as | |
1842 | all other threads are reaped, the execing thread changes | |
1843 | it's tid to the tgid, and the previous (zombie) leader | |
1844 | vanishes, giving place to the "new" leader. We could try | |
1845 | distinguishing the exit and exec cases, by waiting once | |
1846 | more, and seeing if something comes out, but it doesn't | |
1847 | sound useful. The previous leader _does_ go away, and | |
1848 | we'll re-add the new one once we see the exec event | |
1849 | (which is just the same as what would happen if the | |
1850 | previous leader did exit voluntarily before some other | |
1851 | thread execs). */ | |
c3adc08c | 1852 | |
fa96cb38 PA |
1853 | if (debug_threads) |
1854 | fprintf (stderr, | |
1855 | "CZL: Thread group leader %d zombie " | |
1856 | "(it exited, or another thread execd).\n", | |
1857 | leader_pid); | |
c3adc08c | 1858 | |
fa96cb38 | 1859 | delete_lwp (leader_lp); |
c3adc08c PA |
1860 | } |
1861 | } | |
fa96cb38 | 1862 | } |
c3adc08c | 1863 | |
fa96cb38 PA |
1864 | /* Callback for `find_inferior'. Returns the first LWP that is not |
1865 | stopped. ARG is a PTID filter. */ | |
d50171e4 | 1866 | |
fa96cb38 PA |
1867 | static int |
1868 | not_stopped_callback (struct inferior_list_entry *entry, void *arg) | |
1869 | { | |
1870 | struct thread_info *thr = (struct thread_info *) entry; | |
1871 | struct lwp_info *lwp; | |
1872 | ptid_t filter = *(ptid_t *) arg; | |
47c0c975 | 1873 | |
fa96cb38 PA |
1874 | if (!ptid_match (ptid_of (thr), filter)) |
1875 | return 0; | |
bd99dc85 | 1876 | |
fa96cb38 PA |
1877 | lwp = get_thread_lwp (thr); |
1878 | if (!lwp->stopped) | |
1879 | return 1; | |
1880 | ||
1881 | return 0; | |
0d62e5e8 | 1882 | } |
611cb4a5 | 1883 | |
863d01bd PA |
1884 | /* Increment LWP's suspend count. */ |
1885 | ||
1886 | static void | |
1887 | lwp_suspended_inc (struct lwp_info *lwp) | |
1888 | { | |
1889 | lwp->suspended++; | |
1890 | ||
1891 | if (debug_threads && lwp->suspended > 4) | |
1892 | { | |
1893 | struct thread_info *thread = get_lwp_thread (lwp); | |
1894 | ||
1895 | debug_printf ("LWP %ld has a suspiciously high suspend count," | |
1896 | " suspended=%d\n", lwpid_of (thread), lwp->suspended); | |
1897 | } | |
1898 | } | |
1899 | ||
1900 | /* Decrement LWP's suspend count. */ | |
1901 | ||
1902 | static void | |
1903 | lwp_suspended_decr (struct lwp_info *lwp) | |
1904 | { | |
1905 | lwp->suspended--; | |
1906 | ||
1907 | if (lwp->suspended < 0) | |
1908 | { | |
1909 | struct thread_info *thread = get_lwp_thread (lwp); | |
1910 | ||
1911 | internal_error (__FILE__, __LINE__, | |
1912 | "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread), | |
1913 | lwp->suspended); | |
1914 | } | |
1915 | } | |
1916 | ||
219f2f23 PA |
1917 | /* This function should only be called if the LWP got a SIGTRAP. |
1918 | ||
1919 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1920 | event was handled, 0 otherwise. */ | |
1921 | ||
1922 | static int | |
1923 | handle_tracepoints (struct lwp_info *lwp) | |
1924 | { | |
1925 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1926 | int tpoint_related_event = 0; | |
1927 | ||
582511be PA |
1928 | gdb_assert (lwp->suspended == 0); |
1929 | ||
7984d532 PA |
1930 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1931 | uninsert tracepoints. To do this, we temporarily pause all | |
1932 | threads, unpatch away, and then unpause threads. We need to make | |
1933 | sure the unpausing doesn't resume LWP too. */ | |
863d01bd | 1934 | lwp_suspended_inc (lwp); |
7984d532 | 1935 | |
219f2f23 PA |
1936 | /* And we need to be sure that any all-threads-stopping doesn't try |
1937 | to move threads out of the jump pads, as it could deadlock the | |
1938 | inferior (LWP could be in the jump pad, maybe even holding the | |
1939 | lock.) */ | |
1940 | ||
1941 | /* Do any necessary step collect actions. */ | |
1942 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1943 | ||
fa593d66 PA |
1944 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1945 | ||
219f2f23 PA |
1946 | /* See if we just hit a tracepoint and do its main collect |
1947 | actions. */ | |
1948 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1949 | ||
863d01bd | 1950 | lwp_suspended_decr (lwp); |
7984d532 PA |
1951 | |
1952 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1953 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1954 | |
219f2f23 PA |
1955 | if (tpoint_related_event) |
1956 | { | |
1957 | if (debug_threads) | |
87ce2a04 | 1958 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1959 | return 1; |
1960 | } | |
1961 | ||
1962 | return 0; | |
1963 | } | |
1964 | ||
fa593d66 PA |
1965 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1966 | fast tracepoint. */ | |
1967 | ||
1968 | static int | |
1969 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1970 | struct fast_tpoint_collect_status *status) | |
1971 | { | |
1972 | CORE_ADDR thread_area; | |
d86d4aaf | 1973 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1974 | |
1975 | if (the_low_target.get_thread_area == NULL) | |
1976 | return 0; | |
1977 | ||
1978 | /* Get the thread area address. This is used to recognize which | |
1979 | thread is which when tracing with the in-process agent library. | |
1980 | We don't read anything from the address, and treat it as opaque; | |
1981 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 1982 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
fa593d66 PA |
1983 | return 0; |
1984 | ||
1985 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1986 | } | |
1987 | ||
1988 | /* The reason we resume in the caller, is because we want to be able | |
1989 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1990 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1991 | refuses to resume. */ | |
1992 | ||
1993 | static int | |
1994 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1995 | { | |
0bfdf32f | 1996 | struct thread_info *saved_thread; |
fa593d66 | 1997 | |
0bfdf32f GB |
1998 | saved_thread = current_thread; |
1999 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
2000 | |
2001 | if ((wstat == NULL | |
2002 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
2003 | && supports_fast_tracepoints () | |
58b4daa5 | 2004 | && agent_loaded_p ()) |
fa593d66 PA |
2005 | { |
2006 | struct fast_tpoint_collect_status status; | |
2007 | int r; | |
2008 | ||
2009 | if (debug_threads) | |
87ce2a04 DE |
2010 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2011 | "jump pad.\n", | |
0bfdf32f | 2012 | lwpid_of (current_thread)); |
fa593d66 PA |
2013 | |
2014 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
2015 | ||
2016 | if (wstat == NULL | |
2017 | || (WSTOPSIG (*wstat) != SIGILL | |
2018 | && WSTOPSIG (*wstat) != SIGFPE | |
2019 | && WSTOPSIG (*wstat) != SIGSEGV | |
2020 | && WSTOPSIG (*wstat) != SIGBUS)) | |
2021 | { | |
2022 | lwp->collecting_fast_tracepoint = r; | |
2023 | ||
2024 | if (r != 0) | |
2025 | { | |
2026 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
2027 | { | |
2028 | /* Haven't executed the original instruction yet. | |
2029 | Set breakpoint there, and wait till it's hit, | |
2030 | then single-step until exiting the jump pad. */ | |
2031 | lwp->exit_jump_pad_bkpt | |
2032 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
2033 | } | |
2034 | ||
2035 | if (debug_threads) | |
87ce2a04 DE |
2036 | debug_printf ("Checking whether LWP %ld needs to move out of " |
2037 | "the jump pad...it does\n", | |
0bfdf32f GB |
2038 | lwpid_of (current_thread)); |
2039 | current_thread = saved_thread; | |
fa593d66 PA |
2040 | |
2041 | return 1; | |
2042 | } | |
2043 | } | |
2044 | else | |
2045 | { | |
2046 | /* If we get a synchronous signal while collecting, *and* | |
2047 | while executing the (relocated) original instruction, | |
2048 | reset the PC to point at the tpoint address, before | |
2049 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
2050 | report the signal to GDB, and pray for the best. */ | |
2051 | ||
2052 | lwp->collecting_fast_tracepoint = 0; | |
2053 | ||
2054 | if (r != 0 | |
2055 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
2056 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
2057 | { | |
2058 | siginfo_t info; | |
2059 | struct regcache *regcache; | |
2060 | ||
2061 | /* The si_addr on a few signals references the address | |
2062 | of the faulting instruction. Adjust that as | |
2063 | well. */ | |
2064 | if ((WSTOPSIG (*wstat) == SIGILL | |
2065 | || WSTOPSIG (*wstat) == SIGFPE | |
2066 | || WSTOPSIG (*wstat) == SIGBUS | |
2067 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 2068 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2069 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
2070 | /* Final check just to make sure we don't clobber |
2071 | the siginfo of non-kernel-sent signals. */ | |
2072 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
2073 | { | |
2074 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 2075 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2076 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
2077 | } |
2078 | ||
0bfdf32f | 2079 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
2080 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
2081 | lwp->stop_pc = status.tpoint_addr; | |
2082 | ||
2083 | /* Cancel any fast tracepoint lock this thread was | |
2084 | holding. */ | |
2085 | force_unlock_trace_buffer (); | |
2086 | } | |
2087 | ||
2088 | if (lwp->exit_jump_pad_bkpt != NULL) | |
2089 | { | |
2090 | if (debug_threads) | |
87ce2a04 DE |
2091 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
2092 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2093 | |
2094 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
2095 | |
2096 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
2097 | lwp->exit_jump_pad_bkpt = NULL; | |
2098 | ||
2099 | unstop_all_lwps (1, lwp); | |
2100 | ||
2101 | gdb_assert (lwp->suspended >= 0); | |
2102 | } | |
2103 | } | |
2104 | } | |
2105 | ||
2106 | if (debug_threads) | |
87ce2a04 DE |
2107 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2108 | "jump pad...no\n", | |
0bfdf32f | 2109 | lwpid_of (current_thread)); |
0cccb683 | 2110 | |
0bfdf32f | 2111 | current_thread = saved_thread; |
fa593d66 PA |
2112 | return 0; |
2113 | } | |
2114 | ||
2115 | /* Enqueue one signal in the "signals to report later when out of the | |
2116 | jump pad" list. */ | |
2117 | ||
2118 | static void | |
2119 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2120 | { | |
2121 | struct pending_signals *p_sig; | |
d86d4aaf | 2122 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2123 | |
2124 | if (debug_threads) | |
87ce2a04 | 2125 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 2126 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2127 | |
2128 | if (debug_threads) | |
2129 | { | |
2130 | struct pending_signals *sig; | |
2131 | ||
2132 | for (sig = lwp->pending_signals_to_report; | |
2133 | sig != NULL; | |
2134 | sig = sig->prev) | |
87ce2a04 DE |
2135 | debug_printf (" Already queued %d\n", |
2136 | sig->signal); | |
fa593d66 | 2137 | |
87ce2a04 | 2138 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
2139 | } |
2140 | ||
1a981360 PA |
2141 | /* Don't enqueue non-RT signals if they are already in the deferred |
2142 | queue. (SIGSTOP being the easiest signal to see ending up here | |
2143 | twice) */ | |
2144 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
2145 | { | |
2146 | struct pending_signals *sig; | |
2147 | ||
2148 | for (sig = lwp->pending_signals_to_report; | |
2149 | sig != NULL; | |
2150 | sig = sig->prev) | |
2151 | { | |
2152 | if (sig->signal == WSTOPSIG (*wstat)) | |
2153 | { | |
2154 | if (debug_threads) | |
87ce2a04 DE |
2155 | debug_printf ("Not requeuing already queued non-RT signal %d" |
2156 | " for LWP %ld\n", | |
2157 | sig->signal, | |
d86d4aaf | 2158 | lwpid_of (thread)); |
1a981360 PA |
2159 | return; |
2160 | } | |
2161 | } | |
2162 | } | |
2163 | ||
8d749320 | 2164 | p_sig = XCNEW (struct pending_signals); |
fa593d66 PA |
2165 | p_sig->prev = lwp->pending_signals_to_report; |
2166 | p_sig->signal = WSTOPSIG (*wstat); | |
8d749320 | 2167 | |
d86d4aaf | 2168 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2169 | &p_sig->info); |
fa593d66 PA |
2170 | |
2171 | lwp->pending_signals_to_report = p_sig; | |
2172 | } | |
2173 | ||
2174 | /* Dequeue one signal from the "signals to report later when out of | |
2175 | the jump pad" list. */ | |
2176 | ||
2177 | static int | |
2178 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2179 | { | |
d86d4aaf DE |
2180 | struct thread_info *thread = get_lwp_thread (lwp); |
2181 | ||
fa593d66 PA |
2182 | if (lwp->pending_signals_to_report != NULL) |
2183 | { | |
2184 | struct pending_signals **p_sig; | |
2185 | ||
2186 | p_sig = &lwp->pending_signals_to_report; | |
2187 | while ((*p_sig)->prev != NULL) | |
2188 | p_sig = &(*p_sig)->prev; | |
2189 | ||
2190 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
2191 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 2192 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2193 | &(*p_sig)->info); |
fa593d66 PA |
2194 | free (*p_sig); |
2195 | *p_sig = NULL; | |
2196 | ||
2197 | if (debug_threads) | |
87ce2a04 | 2198 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 2199 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2200 | |
2201 | if (debug_threads) | |
2202 | { | |
2203 | struct pending_signals *sig; | |
2204 | ||
2205 | for (sig = lwp->pending_signals_to_report; | |
2206 | sig != NULL; | |
2207 | sig = sig->prev) | |
87ce2a04 DE |
2208 | debug_printf (" Still queued %d\n", |
2209 | sig->signal); | |
fa593d66 | 2210 | |
87ce2a04 | 2211 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
2212 | } |
2213 | ||
2214 | return 1; | |
2215 | } | |
2216 | ||
2217 | return 0; | |
2218 | } | |
2219 | ||
582511be PA |
2220 | /* Fetch the possibly triggered data watchpoint info and store it in |
2221 | CHILD. | |
d50171e4 | 2222 | |
582511be PA |
2223 | On some archs, like x86, that use debug registers to set |
2224 | watchpoints, it's possible that the way to know which watched | |
2225 | address trapped, is to check the register that is used to select | |
2226 | which address to watch. Problem is, between setting the watchpoint | |
2227 | and reading back which data address trapped, the user may change | |
2228 | the set of watchpoints, and, as a consequence, GDB changes the | |
2229 | debug registers in the inferior. To avoid reading back a stale | |
2230 | stopped-data-address when that happens, we cache in LP the fact | |
2231 | that a watchpoint trapped, and the corresponding data address, as | |
2232 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
2233 | registers meanwhile, we have the cached data we can rely on. */ | |
d50171e4 | 2234 | |
582511be PA |
2235 | static int |
2236 | check_stopped_by_watchpoint (struct lwp_info *child) | |
2237 | { | |
2238 | if (the_low_target.stopped_by_watchpoint != NULL) | |
d50171e4 | 2239 | { |
582511be | 2240 | struct thread_info *saved_thread; |
d50171e4 | 2241 | |
582511be PA |
2242 | saved_thread = current_thread; |
2243 | current_thread = get_lwp_thread (child); | |
2244 | ||
2245 | if (the_low_target.stopped_by_watchpoint ()) | |
d50171e4 | 2246 | { |
15c66dd6 | 2247 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; |
582511be PA |
2248 | |
2249 | if (the_low_target.stopped_data_address != NULL) | |
2250 | child->stopped_data_address | |
2251 | = the_low_target.stopped_data_address (); | |
2252 | else | |
2253 | child->stopped_data_address = 0; | |
d50171e4 PA |
2254 | } |
2255 | ||
0bfdf32f | 2256 | current_thread = saved_thread; |
d50171e4 PA |
2257 | } |
2258 | ||
15c66dd6 | 2259 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
c4d9ceb6 YQ |
2260 | } |
2261 | ||
de0d863e DB |
2262 | /* Return the ptrace options that we want to try to enable. */ |
2263 | ||
2264 | static int | |
2265 | linux_low_ptrace_options (int attached) | |
2266 | { | |
2267 | int options = 0; | |
2268 | ||
2269 | if (!attached) | |
2270 | options |= PTRACE_O_EXITKILL; | |
2271 | ||
2272 | if (report_fork_events) | |
2273 | options |= PTRACE_O_TRACEFORK; | |
2274 | ||
c269dbdb DB |
2275 | if (report_vfork_events) |
2276 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); | |
2277 | ||
94585166 DB |
2278 | if (report_exec_events) |
2279 | options |= PTRACE_O_TRACEEXEC; | |
2280 | ||
82075af2 JS |
2281 | options |= PTRACE_O_TRACESYSGOOD; |
2282 | ||
de0d863e DB |
2283 | return options; |
2284 | } | |
2285 | ||
fa96cb38 PA |
2286 | /* Do low-level handling of the event, and check if we should go on |
2287 | and pass it to caller code. Return the affected lwp if we are, or | |
2288 | NULL otherwise. */ | |
2289 | ||
2290 | static struct lwp_info * | |
582511be | 2291 | linux_low_filter_event (int lwpid, int wstat) |
fa96cb38 PA |
2292 | { |
2293 | struct lwp_info *child; | |
2294 | struct thread_info *thread; | |
582511be | 2295 | int have_stop_pc = 0; |
fa96cb38 PA |
2296 | |
2297 | child = find_lwp_pid (pid_to_ptid (lwpid)); | |
2298 | ||
94585166 DB |
2299 | /* Check for stop events reported by a process we didn't already |
2300 | know about - anything not already in our LWP list. | |
2301 | ||
2302 | If we're expecting to receive stopped processes after | |
2303 | fork, vfork, and clone events, then we'll just add the | |
2304 | new one to our list and go back to waiting for the event | |
2305 | to be reported - the stopped process might be returned | |
2306 | from waitpid before or after the event is. | |
2307 | ||
2308 | But note the case of a non-leader thread exec'ing after the | |
2309 | leader having exited, and gone from our lists (because | |
2310 | check_zombie_leaders deleted it). The non-leader thread | |
2311 | changes its tid to the tgid. */ | |
2312 | ||
2313 | if (WIFSTOPPED (wstat) && child == NULL && WSTOPSIG (wstat) == SIGTRAP | |
2314 | && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC) | |
2315 | { | |
2316 | ptid_t child_ptid; | |
2317 | ||
2318 | /* A multi-thread exec after we had seen the leader exiting. */ | |
2319 | if (debug_threads) | |
2320 | { | |
2321 | debug_printf ("LLW: Re-adding thread group leader LWP %d" | |
2322 | "after exec.\n", lwpid); | |
2323 | } | |
2324 | ||
2325 | child_ptid = ptid_build (lwpid, lwpid, 0); | |
2326 | child = add_lwp (child_ptid); | |
2327 | child->stopped = 1; | |
2328 | current_thread = child->thread; | |
2329 | } | |
2330 | ||
fa96cb38 PA |
2331 | /* If we didn't find a process, one of two things presumably happened: |
2332 | - A process we started and then detached from has exited. Ignore it. | |
2333 | - A process we are controlling has forked and the new child's stop | |
2334 | was reported to us by the kernel. Save its PID. */ | |
2335 | if (child == NULL && WIFSTOPPED (wstat)) | |
2336 | { | |
2337 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2338 | return NULL; | |
2339 | } | |
2340 | else if (child == NULL) | |
2341 | return NULL; | |
2342 | ||
2343 | thread = get_lwp_thread (child); | |
2344 | ||
2345 | child->stopped = 1; | |
2346 | ||
2347 | child->last_status = wstat; | |
2348 | ||
582511be PA |
2349 | /* Check if the thread has exited. */ |
2350 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2351 | { | |
2352 | if (debug_threads) | |
2353 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
65706a29 PA |
2354 | /* If there is at least one more LWP, then the exit signal was |
2355 | not the end of the debugged application and should be | |
2356 | ignored, unless GDB wants to hear about thread exits. */ | |
2357 | if (report_thread_events | |
2358 | || last_thread_of_process_p (pid_of (thread))) | |
582511be | 2359 | { |
65706a29 PA |
2360 | /* Since events are serialized to GDB core, and we can't |
2361 | report this one right now. Leave the status pending for | |
2362 | the next time we're able to report it. */ | |
2363 | mark_lwp_dead (child, wstat); | |
2364 | return child; | |
582511be PA |
2365 | } |
2366 | else | |
2367 | { | |
65706a29 PA |
2368 | delete_lwp (child); |
2369 | return NULL; | |
582511be PA |
2370 | } |
2371 | } | |
2372 | ||
2373 | gdb_assert (WIFSTOPPED (wstat)); | |
2374 | ||
fa96cb38 PA |
2375 | if (WIFSTOPPED (wstat)) |
2376 | { | |
2377 | struct process_info *proc; | |
2378 | ||
c06cbd92 | 2379 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2380 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2381 | if (proc->tdesc == NULL) |
fa96cb38 | 2382 | { |
c06cbd92 YQ |
2383 | if (proc->attached) |
2384 | { | |
c06cbd92 YQ |
2385 | /* This needs to happen after we have attached to the |
2386 | inferior and it is stopped for the first time, but | |
2387 | before we access any inferior registers. */ | |
94585166 | 2388 | linux_arch_setup_thread (thread); |
c06cbd92 YQ |
2389 | } |
2390 | else | |
2391 | { | |
2392 | /* The process is started, but GDBserver will do | |
2393 | architecture-specific setup after the program stops at | |
2394 | the first instruction. */ | |
2395 | child->status_pending_p = 1; | |
2396 | child->status_pending = wstat; | |
2397 | return child; | |
2398 | } | |
fa96cb38 PA |
2399 | } |
2400 | } | |
2401 | ||
fa96cb38 PA |
2402 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2403 | { | |
beed38b8 | 2404 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2405 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2406 | |
de0d863e | 2407 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2408 | child->must_set_ptrace_flags = 0; |
2409 | } | |
2410 | ||
82075af2 JS |
2411 | /* Always update syscall_state, even if it will be filtered later. */ |
2412 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SYSCALL_SIGTRAP) | |
2413 | { | |
2414 | child->syscall_state | |
2415 | = (child->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2416 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2417 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2418 | } | |
2419 | else | |
2420 | { | |
2421 | /* Almost all other ptrace-stops are known to be outside of system | |
2422 | calls, with further exceptions in handle_extended_wait. */ | |
2423 | child->syscall_state = TARGET_WAITKIND_IGNORE; | |
2424 | } | |
2425 | ||
e7ad2f14 PA |
2426 | /* Be careful to not overwrite stop_pc until save_stop_reason is |
2427 | called. */ | |
fa96cb38 | 2428 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2429 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2430 | { |
582511be | 2431 | child->stop_pc = get_pc (child); |
94585166 | 2432 | if (handle_extended_wait (&child, wstat)) |
de0d863e DB |
2433 | { |
2434 | /* The event has been handled, so just return without | |
2435 | reporting it. */ | |
2436 | return NULL; | |
2437 | } | |
fa96cb38 PA |
2438 | } |
2439 | ||
3e572f71 | 2440 | if (WIFSTOPPED (wstat) && linux_wstatus_maybe_breakpoint (wstat)) |
582511be | 2441 | { |
e7ad2f14 | 2442 | if (save_stop_reason (child)) |
582511be PA |
2443 | have_stop_pc = 1; |
2444 | } | |
2445 | ||
2446 | if (!have_stop_pc) | |
2447 | child->stop_pc = get_pc (child); | |
2448 | ||
fa96cb38 PA |
2449 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2450 | && child->stop_expected) | |
2451 | { | |
2452 | if (debug_threads) | |
2453 | debug_printf ("Expected stop.\n"); | |
2454 | child->stop_expected = 0; | |
2455 | ||
2456 | if (thread->last_resume_kind == resume_stop) | |
2457 | { | |
2458 | /* We want to report the stop to the core. Treat the | |
2459 | SIGSTOP as a normal event. */ | |
2bf6fb9d PA |
2460 | if (debug_threads) |
2461 | debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n", | |
2462 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2463 | } |
2464 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2465 | { | |
2466 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2467 | pending. */ |
2bf6fb9d PA |
2468 | if (debug_threads) |
2469 | debug_printf ("LLW: SIGSTOP caught for %s " | |
2470 | "while stopping threads.\n", | |
2471 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2472 | return NULL; |
2473 | } | |
2474 | else | |
2475 | { | |
2bf6fb9d PA |
2476 | /* This is a delayed SIGSTOP. Filter out the event. */ |
2477 | if (debug_threads) | |
2478 | debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", | |
2479 | child->stepping ? "step" : "continue", | |
2480 | target_pid_to_str (ptid_of (thread))); | |
2481 | ||
fa96cb38 PA |
2482 | linux_resume_one_lwp (child, child->stepping, 0, NULL); |
2483 | return NULL; | |
2484 | } | |
2485 | } | |
2486 | ||
582511be PA |
2487 | child->status_pending_p = 1; |
2488 | child->status_pending = wstat; | |
fa96cb38 PA |
2489 | return child; |
2490 | } | |
2491 | ||
20ba1ce6 PA |
2492 | /* Resume LWPs that are currently stopped without any pending status |
2493 | to report, but are resumed from the core's perspective. */ | |
2494 | ||
2495 | static void | |
2496 | resume_stopped_resumed_lwps (struct inferior_list_entry *entry) | |
2497 | { | |
2498 | struct thread_info *thread = (struct thread_info *) entry; | |
2499 | struct lwp_info *lp = get_thread_lwp (thread); | |
2500 | ||
2501 | if (lp->stopped | |
863d01bd | 2502 | && !lp->suspended |
20ba1ce6 | 2503 | && !lp->status_pending_p |
20ba1ce6 PA |
2504 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) |
2505 | { | |
2506 | int step = thread->last_resume_kind == resume_step; | |
2507 | ||
2508 | if (debug_threads) | |
2509 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2510 | target_pid_to_str (ptid_of (thread)), | |
2511 | paddress (lp->stop_pc), | |
2512 | step); | |
2513 | ||
2514 | linux_resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); | |
2515 | } | |
2516 | } | |
2517 | ||
fa96cb38 PA |
2518 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
2519 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
2520 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2521 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2522 | the stop status through the status pointer WSTAT. OPTIONS is | |
2523 | passed to the waitpid call. Return 0 if no event was found and | |
2524 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2525 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 2526 | |
0d62e5e8 | 2527 | static int |
fa96cb38 PA |
2528 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
2529 | int *wstatp, int options) | |
0d62e5e8 | 2530 | { |
d86d4aaf | 2531 | struct thread_info *event_thread; |
d50171e4 | 2532 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2533 | sigset_t block_mask, prev_mask; |
d50171e4 | 2534 | |
fa96cb38 | 2535 | retry: |
d86d4aaf DE |
2536 | /* N.B. event_thread points to the thread_info struct that contains |
2537 | event_child. Keep them in sync. */ | |
2538 | event_thread = NULL; | |
d50171e4 PA |
2539 | event_child = NULL; |
2540 | requested_child = NULL; | |
0d62e5e8 | 2541 | |
95954743 | 2542 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2543 | |
fa96cb38 | 2544 | if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid)) |
0d62e5e8 | 2545 | { |
d86d4aaf | 2546 | event_thread = (struct thread_info *) |
fa96cb38 | 2547 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); |
d86d4aaf DE |
2548 | if (event_thread != NULL) |
2549 | event_child = get_thread_lwp (event_thread); | |
2550 | if (debug_threads && event_thread) | |
2551 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2552 | } |
fa96cb38 | 2553 | else if (!ptid_equal (filter_ptid, null_ptid)) |
0d62e5e8 | 2554 | { |
fa96cb38 | 2555 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2556 | |
bde24c0a | 2557 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
2558 | && requested_child->status_pending_p |
2559 | && requested_child->collecting_fast_tracepoint) | |
2560 | { | |
2561 | enqueue_one_deferred_signal (requested_child, | |
2562 | &requested_child->status_pending); | |
2563 | requested_child->status_pending_p = 0; | |
2564 | requested_child->status_pending = 0; | |
2565 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2566 | } | |
2567 | ||
2568 | if (requested_child->suspended | |
2569 | && requested_child->status_pending_p) | |
38e08fca GB |
2570 | { |
2571 | internal_error (__FILE__, __LINE__, | |
2572 | "requesting an event out of a" | |
2573 | " suspended child?"); | |
2574 | } | |
fa593d66 | 2575 | |
d50171e4 | 2576 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2577 | { |
2578 | event_child = requested_child; | |
2579 | event_thread = get_lwp_thread (event_child); | |
2580 | } | |
0d62e5e8 | 2581 | } |
611cb4a5 | 2582 | |
0d62e5e8 DJ |
2583 | if (event_child != NULL) |
2584 | { | |
bd99dc85 | 2585 | if (debug_threads) |
87ce2a04 | 2586 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2587 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2588 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2589 | event_child->status_pending_p = 0; |
2590 | event_child->status_pending = 0; | |
0bfdf32f | 2591 | current_thread = event_thread; |
d86d4aaf | 2592 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2593 | } |
2594 | ||
fa96cb38 PA |
2595 | /* But if we don't find a pending event, we'll have to wait. |
2596 | ||
2597 | We only enter this loop if no process has a pending wait status. | |
2598 | Thus any action taken in response to a wait status inside this | |
2599 | loop is responding as soon as we detect the status, not after any | |
2600 | pending events. */ | |
d8301ad1 | 2601 | |
fa96cb38 PA |
2602 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2603 | all signals while here. */ | |
2604 | sigfillset (&block_mask); | |
2605 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2606 | ||
582511be PA |
2607 | /* Always pull all events out of the kernel. We'll randomly select |
2608 | an event LWP out of all that have events, to prevent | |
2609 | starvation. */ | |
fa96cb38 | 2610 | while (event_child == NULL) |
0d62e5e8 | 2611 | { |
fa96cb38 | 2612 | pid_t ret = 0; |
0d62e5e8 | 2613 | |
fa96cb38 PA |
2614 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2615 | quirks: | |
0d62e5e8 | 2616 | |
fa96cb38 PA |
2617 | - If the thread group leader exits while other threads in the |
2618 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2619 | waitpid won't return an exit status until the other threads | |
2620 | in the group are reaped. | |
611cb4a5 | 2621 | |
fa96cb38 PA |
2622 | - When a non-leader thread execs, that thread just vanishes |
2623 | without reporting an exit (so we'd hang if we waited for it | |
2624 | explicitly in that case). The exec event is reported to | |
94585166 | 2625 | the TGID pid. */ |
fa96cb38 PA |
2626 | errno = 0; |
2627 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2628 | |
fa96cb38 PA |
2629 | if (debug_threads) |
2630 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2631 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2632 | |
fa96cb38 | 2633 | if (ret > 0) |
0d62e5e8 | 2634 | { |
89be2091 | 2635 | if (debug_threads) |
bd99dc85 | 2636 | { |
fa96cb38 PA |
2637 | debug_printf ("LLW: waitpid %ld received %s\n", |
2638 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2639 | } |
89be2091 | 2640 | |
582511be PA |
2641 | /* Filter all events. IOW, leave all events pending. We'll |
2642 | randomly select an event LWP out of all that have events | |
2643 | below. */ | |
2644 | linux_low_filter_event (ret, *wstatp); | |
fa96cb38 PA |
2645 | /* Retry until nothing comes out of waitpid. A single |
2646 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2647 | continue; |
2648 | } | |
2649 | ||
20ba1ce6 PA |
2650 | /* Now that we've pulled all events out of the kernel, resume |
2651 | LWPs that don't have an interesting event to report. */ | |
2652 | if (stopping_threads == NOT_STOPPING_THREADS) | |
2653 | for_each_inferior (&all_threads, resume_stopped_resumed_lwps); | |
2654 | ||
2655 | /* ... and find an LWP with a status to report to the core, if | |
2656 | any. */ | |
582511be PA |
2657 | event_thread = (struct thread_info *) |
2658 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); | |
2659 | if (event_thread != NULL) | |
2660 | { | |
2661 | event_child = get_thread_lwp (event_thread); | |
2662 | *wstatp = event_child->status_pending; | |
2663 | event_child->status_pending_p = 0; | |
2664 | event_child->status_pending = 0; | |
2665 | break; | |
2666 | } | |
2667 | ||
fa96cb38 PA |
2668 | /* Check for zombie thread group leaders. Those can't be reaped |
2669 | until all other threads in the thread group are. */ | |
2670 | check_zombie_leaders (); | |
2671 | ||
2672 | /* If there are no resumed children left in the set of LWPs we | |
2673 | want to wait for, bail. We can't just block in | |
2674 | waitpid/sigsuspend, because lwps might have been left stopped | |
2675 | in trace-stop state, and we'd be stuck forever waiting for | |
2676 | their status to change (which would only happen if we resumed | |
2677 | them). Even if WNOHANG is set, this return code is preferred | |
2678 | over 0 (below), as it is more detailed. */ | |
2679 | if ((find_inferior (&all_threads, | |
2680 | not_stopped_callback, | |
2681 | &wait_ptid) == NULL)) | |
a6dbe5df | 2682 | { |
fa96cb38 PA |
2683 | if (debug_threads) |
2684 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2685 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2686 | return -1; | |
a6dbe5df PA |
2687 | } |
2688 | ||
fa96cb38 PA |
2689 | /* No interesting event to report to the caller. */ |
2690 | if ((options & WNOHANG)) | |
24a09b5f | 2691 | { |
fa96cb38 PA |
2692 | if (debug_threads) |
2693 | debug_printf ("WNOHANG set, no event found\n"); | |
2694 | ||
2695 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2696 | return 0; | |
24a09b5f DJ |
2697 | } |
2698 | ||
fa96cb38 PA |
2699 | /* Block until we get an event reported with SIGCHLD. */ |
2700 | if (debug_threads) | |
2701 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2702 | |
fa96cb38 PA |
2703 | sigsuspend (&prev_mask); |
2704 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2705 | goto retry; | |
2706 | } | |
d50171e4 | 2707 | |
fa96cb38 | 2708 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2709 | |
0bfdf32f | 2710 | current_thread = event_thread; |
d50171e4 | 2711 | |
fa96cb38 PA |
2712 | return lwpid_of (event_thread); |
2713 | } | |
2714 | ||
2715 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2716 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2717 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2718 | the stop status through the status pointer WSTAT. OPTIONS is | |
2719 | passed to the waitpid call. Return 0 if no event was found and | |
2720 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2721 | was found. Return the PID of the stopped child otherwise. */ | |
2722 | ||
2723 | static int | |
2724 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2725 | { | |
2726 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2727 | } |
2728 | ||
6bf5e0ba PA |
2729 | /* Count the LWP's that have had events. */ |
2730 | ||
2731 | static int | |
2732 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2733 | { | |
d86d4aaf | 2734 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2735 | struct lwp_info *lp = get_thread_lwp (thread); |
9a3c8263 | 2736 | int *count = (int *) data; |
6bf5e0ba PA |
2737 | |
2738 | gdb_assert (count != NULL); | |
2739 | ||
582511be | 2740 | /* Count only resumed LWPs that have an event pending. */ |
8336d594 | 2741 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2742 | && lp->status_pending_p) |
6bf5e0ba PA |
2743 | (*count)++; |
2744 | ||
2745 | return 0; | |
2746 | } | |
2747 | ||
2748 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2749 | ||
2750 | static int | |
2751 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2752 | { | |
d86d4aaf DE |
2753 | struct thread_info *thread = (struct thread_info *) entry; |
2754 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba | 2755 | |
8336d594 PA |
2756 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2757 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2758 | && lp->status_pending_p) |
2759 | return 1; | |
2760 | else | |
2761 | return 0; | |
2762 | } | |
2763 | ||
b90fc188 | 2764 | /* Select the Nth LWP that has had an event. */ |
6bf5e0ba PA |
2765 | |
2766 | static int | |
2767 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2768 | { | |
d86d4aaf | 2769 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2770 | struct lwp_info *lp = get_thread_lwp (thread); |
9a3c8263 | 2771 | int *selector = (int *) data; |
6bf5e0ba PA |
2772 | |
2773 | gdb_assert (selector != NULL); | |
2774 | ||
582511be | 2775 | /* Select only resumed LWPs that have an event pending. */ |
91baf43f | 2776 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2777 | && lp->status_pending_p) |
6bf5e0ba PA |
2778 | if ((*selector)-- == 0) |
2779 | return 1; | |
2780 | ||
2781 | return 0; | |
2782 | } | |
2783 | ||
6bf5e0ba PA |
2784 | /* Select one LWP out of those that have events pending. */ |
2785 | ||
2786 | static void | |
2787 | select_event_lwp (struct lwp_info **orig_lp) | |
2788 | { | |
2789 | int num_events = 0; | |
2790 | int random_selector; | |
582511be PA |
2791 | struct thread_info *event_thread = NULL; |
2792 | ||
2793 | /* In all-stop, give preference to the LWP that is being | |
2794 | single-stepped. There will be at most one, and it's the LWP that | |
2795 | the core is most interested in. If we didn't do this, then we'd | |
2796 | have to handle pending step SIGTRAPs somehow in case the core | |
2797 | later continues the previously-stepped thread, otherwise we'd | |
2798 | report the pending SIGTRAP, and the core, not having stepped the | |
2799 | thread, wouldn't understand what the trap was for, and therefore | |
2800 | would report it to the user as a random signal. */ | |
2801 | if (!non_stop) | |
6bf5e0ba | 2802 | { |
582511be PA |
2803 | event_thread |
2804 | = (struct thread_info *) find_inferior (&all_threads, | |
2805 | select_singlestep_lwp_callback, | |
2806 | NULL); | |
2807 | if (event_thread != NULL) | |
2808 | { | |
2809 | if (debug_threads) | |
2810 | debug_printf ("SEL: Select single-step %s\n", | |
2811 | target_pid_to_str (ptid_of (event_thread))); | |
2812 | } | |
6bf5e0ba | 2813 | } |
582511be | 2814 | if (event_thread == NULL) |
6bf5e0ba PA |
2815 | { |
2816 | /* No single-stepping LWP. Select one at random, out of those | |
b90fc188 | 2817 | which have had events. */ |
6bf5e0ba | 2818 | |
b90fc188 | 2819 | /* First see how many events we have. */ |
d86d4aaf | 2820 | find_inferior (&all_threads, count_events_callback, &num_events); |
8bf3b159 | 2821 | gdb_assert (num_events > 0); |
6bf5e0ba | 2822 | |
b90fc188 PA |
2823 | /* Now randomly pick a LWP out of those that have had |
2824 | events. */ | |
6bf5e0ba PA |
2825 | random_selector = (int) |
2826 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2827 | ||
2828 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2829 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2830 | num_events, random_selector); | |
6bf5e0ba | 2831 | |
d86d4aaf DE |
2832 | event_thread |
2833 | = (struct thread_info *) find_inferior (&all_threads, | |
2834 | select_event_lwp_callback, | |
2835 | &random_selector); | |
6bf5e0ba PA |
2836 | } |
2837 | ||
d86d4aaf | 2838 | if (event_thread != NULL) |
6bf5e0ba | 2839 | { |
d86d4aaf DE |
2840 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2841 | ||
6bf5e0ba PA |
2842 | /* Switch the event LWP. */ |
2843 | *orig_lp = event_lp; | |
2844 | } | |
2845 | } | |
2846 | ||
7984d532 PA |
2847 | /* Decrement the suspend count of an LWP. */ |
2848 | ||
2849 | static int | |
2850 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2851 | { | |
d86d4aaf DE |
2852 | struct thread_info *thread = (struct thread_info *) entry; |
2853 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
2854 | |
2855 | /* Ignore EXCEPT. */ | |
2856 | if (lwp == except) | |
2857 | return 0; | |
2858 | ||
863d01bd | 2859 | lwp_suspended_decr (lwp); |
7984d532 PA |
2860 | return 0; |
2861 | } | |
2862 | ||
2863 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2864 | NULL. */ | |
2865 | ||
2866 | static void | |
2867 | unsuspend_all_lwps (struct lwp_info *except) | |
2868 | { | |
d86d4aaf | 2869 | find_inferior (&all_threads, unsuspend_one_lwp, except); |
7984d532 PA |
2870 | } |
2871 | ||
fa593d66 PA |
2872 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2873 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2874 | void *data); | |
2875 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2876 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2877 | struct target_waitstatus *ourstatus, | |
2878 | int target_options); | |
2879 | ||
2880 | /* Stabilize threads (move out of jump pads). | |
2881 | ||
2882 | If a thread is midway collecting a fast tracepoint, we need to | |
2883 | finish the collection and move it out of the jump pad before | |
2884 | reporting the signal. | |
2885 | ||
2886 | This avoids recursion while collecting (when a signal arrives | |
2887 | midway, and the signal handler itself collects), which would trash | |
2888 | the trace buffer. In case the user set a breakpoint in a signal | |
2889 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2890 | Most importantly, there are certain things we can't do safely if | |
2891 | threads are stopped in a jump pad (or in its callee's). For | |
2892 | example: | |
2893 | ||
2894 | - starting a new trace run. A thread still collecting the | |
2895 | previous run, could trash the trace buffer when resumed. The trace | |
2896 | buffer control structures would have been reset but the thread had | |
2897 | no way to tell. The thread could even midway memcpy'ing to the | |
2898 | buffer, which would mean that when resumed, it would clobber the | |
2899 | trace buffer that had been set for a new run. | |
2900 | ||
2901 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2902 | safely. Say you do tstart while a thread is stopped midway while | |
2903 | collecting. When the thread is later resumed, it finishes the | |
2904 | collection, and returns to the jump pad, to execute the original | |
2905 | instruction that was under the tracepoint jump at the time the | |
2906 | older run had been started. If the jump pad had been rewritten | |
2907 | since for something else in the new run, the thread would now | |
2908 | execute the wrong / random instructions. */ | |
2909 | ||
2910 | static void | |
2911 | linux_stabilize_threads (void) | |
2912 | { | |
0bfdf32f | 2913 | struct thread_info *saved_thread; |
d86d4aaf | 2914 | struct thread_info *thread_stuck; |
fa593d66 | 2915 | |
d86d4aaf DE |
2916 | thread_stuck |
2917 | = (struct thread_info *) find_inferior (&all_threads, | |
2918 | stuck_in_jump_pad_callback, | |
2919 | NULL); | |
2920 | if (thread_stuck != NULL) | |
fa593d66 | 2921 | { |
b4d51a55 | 2922 | if (debug_threads) |
87ce2a04 | 2923 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2924 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2925 | return; |
2926 | } | |
2927 | ||
0bfdf32f | 2928 | saved_thread = current_thread; |
fa593d66 PA |
2929 | |
2930 | stabilizing_threads = 1; | |
2931 | ||
2932 | /* Kick 'em all. */ | |
d86d4aaf | 2933 | for_each_inferior (&all_threads, move_out_of_jump_pad_callback); |
fa593d66 PA |
2934 | |
2935 | /* Loop until all are stopped out of the jump pads. */ | |
d86d4aaf | 2936 | while (find_inferior (&all_threads, lwp_running, NULL) != NULL) |
fa593d66 PA |
2937 | { |
2938 | struct target_waitstatus ourstatus; | |
2939 | struct lwp_info *lwp; | |
fa593d66 PA |
2940 | int wstat; |
2941 | ||
2942 | /* Note that we go through the full wait even loop. While | |
2943 | moving threads out of jump pad, we need to be able to step | |
2944 | over internal breakpoints and such. */ | |
32fcada3 | 2945 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2946 | |
2947 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2948 | { | |
0bfdf32f | 2949 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2950 | |
2951 | /* Lock it. */ | |
863d01bd | 2952 | lwp_suspended_inc (lwp); |
fa593d66 | 2953 | |
a493e3e2 | 2954 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2955 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2956 | { |
2ea28649 | 2957 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2958 | enqueue_one_deferred_signal (lwp, &wstat); |
2959 | } | |
2960 | } | |
2961 | } | |
2962 | ||
d86d4aaf | 2963 | find_inferior (&all_threads, unsuspend_one_lwp, NULL); |
fa593d66 PA |
2964 | |
2965 | stabilizing_threads = 0; | |
2966 | ||
0bfdf32f | 2967 | current_thread = saved_thread; |
fa593d66 | 2968 | |
b4d51a55 | 2969 | if (debug_threads) |
fa593d66 | 2970 | { |
d86d4aaf DE |
2971 | thread_stuck |
2972 | = (struct thread_info *) find_inferior (&all_threads, | |
2973 | stuck_in_jump_pad_callback, | |
2974 | NULL); | |
2975 | if (thread_stuck != NULL) | |
87ce2a04 | 2976 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2977 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2978 | } |
2979 | } | |
2980 | ||
582511be PA |
2981 | /* Convenience function that is called when the kernel reports an |
2982 | event that is not passed out to GDB. */ | |
2983 | ||
2984 | static ptid_t | |
2985 | ignore_event (struct target_waitstatus *ourstatus) | |
2986 | { | |
2987 | /* If we got an event, there may still be others, as a single | |
2988 | SIGCHLD can indicate more than one child stopped. This forces | |
2989 | another target_wait call. */ | |
2990 | async_file_mark (); | |
2991 | ||
2992 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2993 | return null_ptid; | |
2994 | } | |
2995 | ||
65706a29 PA |
2996 | /* Convenience function that is called when the kernel reports an exit |
2997 | event. This decides whether to report the event to GDB as a | |
2998 | process exit event, a thread exit event, or to suppress the | |
2999 | event. */ | |
3000 | ||
3001 | static ptid_t | |
3002 | filter_exit_event (struct lwp_info *event_child, | |
3003 | struct target_waitstatus *ourstatus) | |
3004 | { | |
3005 | struct thread_info *thread = get_lwp_thread (event_child); | |
3006 | ptid_t ptid = ptid_of (thread); | |
3007 | ||
3008 | if (!last_thread_of_process_p (pid_of (thread))) | |
3009 | { | |
3010 | if (report_thread_events) | |
3011 | ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED; | |
3012 | else | |
3013 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3014 | ||
3015 | delete_lwp (event_child); | |
3016 | } | |
3017 | return ptid; | |
3018 | } | |
3019 | ||
82075af2 JS |
3020 | /* Returns 1 if GDB is interested in any event_child syscalls. */ |
3021 | ||
3022 | static int | |
3023 | gdb_catching_syscalls_p (struct lwp_info *event_child) | |
3024 | { | |
3025 | struct thread_info *thread = get_lwp_thread (event_child); | |
3026 | struct process_info *proc = get_thread_process (thread); | |
3027 | ||
3028 | return !VEC_empty (int, proc->syscalls_to_catch); | |
3029 | } | |
3030 | ||
3031 | /* Returns 1 if GDB is interested in the event_child syscall. | |
3032 | Only to be called when stopped reason is SYSCALL_SIGTRAP. */ | |
3033 | ||
3034 | static int | |
3035 | gdb_catch_this_syscall_p (struct lwp_info *event_child) | |
3036 | { | |
3037 | int i, iter; | |
3038 | int sysno, sysret; | |
3039 | struct thread_info *thread = get_lwp_thread (event_child); | |
3040 | struct process_info *proc = get_thread_process (thread); | |
3041 | ||
3042 | if (VEC_empty (int, proc->syscalls_to_catch)) | |
3043 | return 0; | |
3044 | ||
3045 | if (VEC_index (int, proc->syscalls_to_catch, 0) == ANY_SYSCALL) | |
3046 | return 1; | |
3047 | ||
3048 | get_syscall_trapinfo (event_child, &sysno, &sysret); | |
3049 | for (i = 0; | |
3050 | VEC_iterate (int, proc->syscalls_to_catch, i, iter); | |
3051 | i++) | |
3052 | if (iter == sysno) | |
3053 | return 1; | |
3054 | ||
3055 | return 0; | |
3056 | } | |
3057 | ||
0d62e5e8 | 3058 | /* Wait for process, returns status. */ |
da6d8c04 | 3059 | |
95954743 PA |
3060 | static ptid_t |
3061 | linux_wait_1 (ptid_t ptid, | |
3062 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 3063 | { |
e5f1222d | 3064 | int w; |
fc7238bb | 3065 | struct lwp_info *event_child; |
bd99dc85 | 3066 | int options; |
bd99dc85 | 3067 | int pid; |
6bf5e0ba PA |
3068 | int step_over_finished; |
3069 | int bp_explains_trap; | |
3070 | int maybe_internal_trap; | |
3071 | int report_to_gdb; | |
219f2f23 | 3072 | int trace_event; |
c2d6af84 | 3073 | int in_step_range; |
f2faf941 | 3074 | int any_resumed; |
bd99dc85 | 3075 | |
87ce2a04 DE |
3076 | if (debug_threads) |
3077 | { | |
3078 | debug_enter (); | |
3079 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
3080 | } | |
3081 | ||
bd99dc85 PA |
3082 | /* Translate generic target options into linux options. */ |
3083 | options = __WALL; | |
3084 | if (target_options & TARGET_WNOHANG) | |
3085 | options |= WNOHANG; | |
0d62e5e8 | 3086 | |
fa593d66 PA |
3087 | bp_explains_trap = 0; |
3088 | trace_event = 0; | |
c2d6af84 | 3089 | in_step_range = 0; |
bd99dc85 PA |
3090 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
3091 | ||
f2faf941 PA |
3092 | /* Find a resumed LWP, if any. */ |
3093 | if (find_inferior (&all_threads, | |
3094 | status_pending_p_callback, | |
3095 | &minus_one_ptid) != NULL) | |
3096 | any_resumed = 1; | |
3097 | else if ((find_inferior (&all_threads, | |
3098 | not_stopped_callback, | |
3099 | &minus_one_ptid) != NULL)) | |
3100 | any_resumed = 1; | |
3101 | else | |
3102 | any_resumed = 0; | |
3103 | ||
6bf5e0ba PA |
3104 | if (ptid_equal (step_over_bkpt, null_ptid)) |
3105 | pid = linux_wait_for_event (ptid, &w, options); | |
3106 | else | |
3107 | { | |
3108 | if (debug_threads) | |
87ce2a04 DE |
3109 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
3110 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
3111 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
3112 | } | |
3113 | ||
f2faf941 | 3114 | if (pid == 0 || (pid == -1 && !any_resumed)) |
87ce2a04 | 3115 | { |
fa96cb38 PA |
3116 | gdb_assert (target_options & TARGET_WNOHANG); |
3117 | ||
87ce2a04 DE |
3118 | if (debug_threads) |
3119 | { | |
fa96cb38 PA |
3120 | debug_printf ("linux_wait_1 ret = null_ptid, " |
3121 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
3122 | debug_exit (); |
3123 | } | |
fa96cb38 PA |
3124 | |
3125 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
3126 | return null_ptid; |
3127 | } | |
fa96cb38 PA |
3128 | else if (pid == -1) |
3129 | { | |
3130 | if (debug_threads) | |
3131 | { | |
3132 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
3133 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
3134 | debug_exit (); | |
3135 | } | |
bd99dc85 | 3136 | |
fa96cb38 PA |
3137 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
3138 | return null_ptid; | |
3139 | } | |
0d62e5e8 | 3140 | |
0bfdf32f | 3141 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 3142 | |
fa96cb38 PA |
3143 | /* linux_wait_for_event only returns an exit status for the last |
3144 | child of a process. Report it. */ | |
3145 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 3146 | { |
fa96cb38 | 3147 | if (WIFEXITED (w)) |
0d62e5e8 | 3148 | { |
fa96cb38 PA |
3149 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
3150 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 3151 | |
fa96cb38 | 3152 | if (debug_threads) |
bd99dc85 | 3153 | { |
fa96cb38 PA |
3154 | debug_printf ("linux_wait_1 ret = %s, exited with " |
3155 | "retcode %d\n", | |
0bfdf32f | 3156 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3157 | WEXITSTATUS (w)); |
3158 | debug_exit (); | |
bd99dc85 | 3159 | } |
fa96cb38 PA |
3160 | } |
3161 | else | |
3162 | { | |
3163 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
3164 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 3165 | |
fa96cb38 PA |
3166 | if (debug_threads) |
3167 | { | |
3168 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
3169 | "signal %d\n", | |
0bfdf32f | 3170 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3171 | WTERMSIG (w)); |
3172 | debug_exit (); | |
3173 | } | |
0d62e5e8 | 3174 | } |
fa96cb38 | 3175 | |
65706a29 PA |
3176 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3177 | return filter_exit_event (event_child, ourstatus); | |
3178 | ||
0bfdf32f | 3179 | return ptid_of (current_thread); |
da6d8c04 DJ |
3180 | } |
3181 | ||
2d97cd35 AT |
3182 | /* If step-over executes a breakpoint instruction, in the case of a |
3183 | hardware single step it means a gdb/gdbserver breakpoint had been | |
3184 | planted on top of a permanent breakpoint, in the case of a software | |
3185 | single step it may just mean that gdbserver hit the reinsert breakpoint. | |
e7ad2f14 | 3186 | The PC has been adjusted by save_stop_reason to point at |
2d97cd35 AT |
3187 | the breakpoint address. |
3188 | So in the case of the hardware single step advance the PC manually | |
3189 | past the breakpoint and in the case of software single step advance only | |
3190 | if it's not the reinsert_breakpoint we are hitting. | |
3191 | This avoids that a program would keep trapping a permanent breakpoint | |
3192 | forever. */ | |
8090aef2 | 3193 | if (!ptid_equal (step_over_bkpt, null_ptid) |
2d97cd35 AT |
3194 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
3195 | && (event_child->stepping | |
3196 | || !reinsert_breakpoint_inserted_here (event_child->stop_pc))) | |
8090aef2 | 3197 | { |
dd373349 AT |
3198 | int increment_pc = 0; |
3199 | int breakpoint_kind = 0; | |
3200 | CORE_ADDR stop_pc = event_child->stop_pc; | |
3201 | ||
769ef81f AT |
3202 | breakpoint_kind = |
3203 | the_target->breakpoint_kind_from_current_state (&stop_pc); | |
dd373349 | 3204 | the_target->sw_breakpoint_from_kind (breakpoint_kind, &increment_pc); |
8090aef2 PA |
3205 | |
3206 | if (debug_threads) | |
3207 | { | |
3208 | debug_printf ("step-over for %s executed software breakpoint\n", | |
3209 | target_pid_to_str (ptid_of (current_thread))); | |
3210 | } | |
3211 | ||
3212 | if (increment_pc != 0) | |
3213 | { | |
3214 | struct regcache *regcache | |
3215 | = get_thread_regcache (current_thread, 1); | |
3216 | ||
3217 | event_child->stop_pc += increment_pc; | |
3218 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
3219 | ||
3220 | if (!(*the_low_target.breakpoint_at) (event_child->stop_pc)) | |
15c66dd6 | 3221 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
3222 | } |
3223 | } | |
3224 | ||
6bf5e0ba PA |
3225 | /* If this event was not handled before, and is not a SIGTRAP, we |
3226 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
3227 | a breakpoint is inserted at the current PC. If this target does | |
3228 | not support internal breakpoints at all, we also report the | |
3229 | SIGTRAP without further processing; it's of no concern to us. */ | |
3230 | maybe_internal_trap | |
3231 | = (supports_breakpoints () | |
3232 | && (WSTOPSIG (w) == SIGTRAP | |
3233 | || ((WSTOPSIG (w) == SIGILL | |
3234 | || WSTOPSIG (w) == SIGSEGV) | |
3235 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
3236 | ||
3237 | if (maybe_internal_trap) | |
3238 | { | |
3239 | /* Handle anything that requires bookkeeping before deciding to | |
3240 | report the event or continue waiting. */ | |
3241 | ||
3242 | /* First check if we can explain the SIGTRAP with an internal | |
3243 | breakpoint, or if we should possibly report the event to GDB. | |
3244 | Do this before anything that may remove or insert a | |
3245 | breakpoint. */ | |
3246 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
3247 | ||
3248 | /* We have a SIGTRAP, possibly a step-over dance has just | |
3249 | finished. If so, tweak the state machine accordingly, | |
3250 | reinsert breakpoints and delete any reinsert (software | |
3251 | single-step) breakpoints. */ | |
3252 | step_over_finished = finish_step_over (event_child); | |
3253 | ||
3254 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
3255 | check_breakpoints (event_child->stop_pc); | |
3256 | ||
219f2f23 PA |
3257 | /* Handle tracepoint data collecting. This may overflow the |
3258 | trace buffer, and cause a tracing stop, removing | |
3259 | breakpoints. */ | |
3260 | trace_event = handle_tracepoints (event_child); | |
3261 | ||
6bf5e0ba PA |
3262 | if (bp_explains_trap) |
3263 | { | |
3264 | /* If we stepped or ran into an internal breakpoint, we've | |
3265 | already handled it. So next time we resume (from this | |
3266 | PC), we should step over it. */ | |
3267 | if (debug_threads) | |
87ce2a04 | 3268 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3269 | |
8b07ae33 PA |
3270 | if (breakpoint_here (event_child->stop_pc)) |
3271 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
3272 | } |
3273 | } | |
3274 | else | |
3275 | { | |
3276 | /* We have some other signal, possibly a step-over dance was in | |
3277 | progress, and it should be cancelled too. */ | |
3278 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
3279 | } |
3280 | ||
3281 | /* We have all the data we need. Either report the event to GDB, or | |
3282 | resume threads and keep waiting for more. */ | |
3283 | ||
3284 | /* If we're collecting a fast tracepoint, finish the collection and | |
3285 | move out of the jump pad before delivering a signal. See | |
3286 | linux_stabilize_threads. */ | |
3287 | ||
3288 | if (WIFSTOPPED (w) | |
3289 | && WSTOPSIG (w) != SIGTRAP | |
3290 | && supports_fast_tracepoints () | |
58b4daa5 | 3291 | && agent_loaded_p ()) |
fa593d66 PA |
3292 | { |
3293 | if (debug_threads) | |
87ce2a04 DE |
3294 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
3295 | "to defer or adjust it.\n", | |
0bfdf32f | 3296 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3297 | |
3298 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 3299 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
3300 | && maybe_move_out_of_jump_pad (event_child, &w)) |
3301 | { | |
3302 | enqueue_one_deferred_signal (event_child, &w); | |
3303 | ||
3304 | if (debug_threads) | |
87ce2a04 | 3305 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 3306 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3307 | |
3308 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
582511be PA |
3309 | |
3310 | return ignore_event (ourstatus); | |
fa593d66 PA |
3311 | } |
3312 | } | |
219f2f23 | 3313 | |
fa593d66 PA |
3314 | if (event_child->collecting_fast_tracepoint) |
3315 | { | |
3316 | if (debug_threads) | |
87ce2a04 DE |
3317 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
3318 | "Check if we're already there.\n", | |
0bfdf32f | 3319 | lwpid_of (current_thread), |
87ce2a04 | 3320 | event_child->collecting_fast_tracepoint); |
fa593d66 PA |
3321 | |
3322 | trace_event = 1; | |
3323 | ||
3324 | event_child->collecting_fast_tracepoint | |
3325 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3326 | ||
3327 | if (event_child->collecting_fast_tracepoint != 1) | |
3328 | { | |
3329 | /* No longer need this breakpoint. */ | |
3330 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3331 | { | |
3332 | if (debug_threads) | |
87ce2a04 DE |
3333 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
3334 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
3335 | |
3336 | /* Other running threads could hit this breakpoint. | |
3337 | We don't handle moribund locations like GDB does, | |
3338 | instead we always pause all threads when removing | |
3339 | breakpoints, so that any step-over or | |
3340 | decr_pc_after_break adjustment is always taken | |
3341 | care of while the breakpoint is still | |
3342 | inserted. */ | |
3343 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3344 | |
3345 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3346 | event_child->exit_jump_pad_bkpt = NULL; | |
3347 | ||
3348 | unstop_all_lwps (1, event_child); | |
3349 | ||
3350 | gdb_assert (event_child->suspended >= 0); | |
3351 | } | |
3352 | } | |
3353 | ||
3354 | if (event_child->collecting_fast_tracepoint == 0) | |
3355 | { | |
3356 | if (debug_threads) | |
87ce2a04 DE |
3357 | debug_printf ("fast tracepoint finished " |
3358 | "collecting successfully.\n"); | |
fa593d66 PA |
3359 | |
3360 | /* We may have a deferred signal to report. */ | |
3361 | if (dequeue_one_deferred_signal (event_child, &w)) | |
3362 | { | |
3363 | if (debug_threads) | |
87ce2a04 | 3364 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 3365 | } |
3c11dd79 | 3366 | else |
fa593d66 | 3367 | { |
3c11dd79 | 3368 | if (debug_threads) |
87ce2a04 | 3369 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
3370 | |
3371 | if (stabilizing_threads) | |
3372 | { | |
3373 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 3374 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
3375 | |
3376 | if (debug_threads) | |
3377 | { | |
3378 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
3379 | "while stabilizing threads\n", | |
0bfdf32f | 3380 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
3381 | debug_exit (); |
3382 | } | |
3383 | ||
0bfdf32f | 3384 | return ptid_of (current_thread); |
fa593d66 PA |
3385 | } |
3386 | } | |
3387 | } | |
6bf5e0ba PA |
3388 | } |
3389 | ||
e471f25b PA |
3390 | /* Check whether GDB would be interested in this event. */ |
3391 | ||
82075af2 JS |
3392 | /* Check if GDB is interested in this syscall. */ |
3393 | if (WIFSTOPPED (w) | |
3394 | && WSTOPSIG (w) == SYSCALL_SIGTRAP | |
3395 | && !gdb_catch_this_syscall_p (event_child)) | |
3396 | { | |
3397 | if (debug_threads) | |
3398 | { | |
3399 | debug_printf ("Ignored syscall for LWP %ld.\n", | |
3400 | lwpid_of (current_thread)); | |
3401 | } | |
3402 | ||
3403 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3404 | 0, NULL); | |
3405 | return ignore_event (ourstatus); | |
3406 | } | |
3407 | ||
e471f25b PA |
3408 | /* If GDB is not interested in this signal, don't stop other |
3409 | threads, and don't report it to GDB. Just resume the inferior | |
3410 | right away. We do this for threading-related signals as well as | |
3411 | any that GDB specifically requested we ignore. But never ignore | |
3412 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3413 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3414 | handler. Also never ignore signals that could be caused by a |
3415 | breakpoint. */ | |
e471f25b | 3416 | if (WIFSTOPPED (w) |
0bfdf32f | 3417 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3418 | && ( |
1a981360 | 3419 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3420 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3421 | && (WSTOPSIG (w) == __SIGRTMIN |
3422 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3423 | || | |
3424 | #endif | |
2ea28649 | 3425 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3426 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3427 | && current_thread->last_resume_kind == resume_stop) |
3428 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3429 | { |
3430 | siginfo_t info, *info_p; | |
3431 | ||
3432 | if (debug_threads) | |
87ce2a04 | 3433 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 3434 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 3435 | |
0bfdf32f | 3436 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3437 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3438 | info_p = &info; |
3439 | else | |
3440 | info_p = NULL; | |
863d01bd PA |
3441 | |
3442 | if (step_over_finished) | |
3443 | { | |
3444 | /* We cancelled this thread's step-over above. We still | |
3445 | need to unsuspend all other LWPs, and set them back | |
3446 | running again while the signal handler runs. */ | |
3447 | unsuspend_all_lwps (event_child); | |
3448 | ||
3449 | /* Enqueue the pending signal info so that proceed_all_lwps | |
3450 | doesn't lose it. */ | |
3451 | enqueue_pending_signal (event_child, WSTOPSIG (w), info_p); | |
3452 | ||
3453 | proceed_all_lwps (); | |
3454 | } | |
3455 | else | |
3456 | { | |
3457 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3458 | WSTOPSIG (w), info_p); | |
3459 | } | |
582511be | 3460 | return ignore_event (ourstatus); |
e471f25b PA |
3461 | } |
3462 | ||
c2d6af84 PA |
3463 | /* Note that all addresses are always "out of the step range" when |
3464 | there's no range to begin with. */ | |
3465 | in_step_range = lwp_in_step_range (event_child); | |
3466 | ||
3467 | /* If GDB wanted this thread to single step, and the thread is out | |
3468 | of the step range, we always want to report the SIGTRAP, and let | |
3469 | GDB handle it. Watchpoints should always be reported. So should | |
3470 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3471 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3472 | do, we're be able to handle GDB breakpoints on top of internal | |
3473 | breakpoints, by handling the internal breakpoint and still | |
3474 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
863d01bd PA |
3475 | won't see the breakpoint hit. If we see a single-step event but |
3476 | the thread should be continuing, don't pass the trap to gdb. | |
3477 | That indicates that we had previously finished a single-step but | |
3478 | left the single-step pending -- see | |
3479 | complete_ongoing_step_over. */ | |
6bf5e0ba | 3480 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3481 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3482 | && !in_step_range) |
15c66dd6 | 3483 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
863d01bd PA |
3484 | || (!in_step_range |
3485 | && !bp_explains_trap | |
3486 | && !trace_event | |
3487 | && !step_over_finished | |
3488 | && !(current_thread->last_resume_kind == resume_continue | |
3489 | && event_child->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP)) | |
9f3a5c85 | 3490 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3491 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e | 3492 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
00db26fa | 3493 | || event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE); |
d3ce09f5 SS |
3494 | |
3495 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3496 | |
3497 | /* We found no reason GDB would want us to stop. We either hit one | |
3498 | of our own breakpoints, or finished an internal step GDB | |
3499 | shouldn't know about. */ | |
3500 | if (!report_to_gdb) | |
3501 | { | |
3502 | if (debug_threads) | |
3503 | { | |
3504 | if (bp_explains_trap) | |
87ce2a04 | 3505 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3506 | if (step_over_finished) |
87ce2a04 | 3507 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 3508 | if (trace_event) |
87ce2a04 | 3509 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 3510 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
3511 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
3512 | paddress (event_child->stop_pc), | |
3513 | paddress (event_child->step_range_start), | |
3514 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3515 | } |
3516 | ||
3517 | /* We're not reporting this breakpoint to GDB, so apply the | |
3518 | decr_pc_after_break adjustment to the inferior's regcache | |
3519 | ourselves. */ | |
3520 | ||
3521 | if (the_low_target.set_pc != NULL) | |
3522 | { | |
3523 | struct regcache *regcache | |
0bfdf32f | 3524 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
3525 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
3526 | } | |
3527 | ||
7984d532 PA |
3528 | /* We may have finished stepping over a breakpoint. If so, |
3529 | we've stopped and suspended all LWPs momentarily except the | |
3530 | stepping one. This is where we resume them all again. We're | |
3531 | going to keep waiting, so use proceed, which handles stepping | |
3532 | over the next breakpoint. */ | |
6bf5e0ba | 3533 | if (debug_threads) |
87ce2a04 | 3534 | debug_printf ("proceeding all threads.\n"); |
7984d532 PA |
3535 | |
3536 | if (step_over_finished) | |
3537 | unsuspend_all_lwps (event_child); | |
3538 | ||
6bf5e0ba | 3539 | proceed_all_lwps (); |
582511be | 3540 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3541 | } |
3542 | ||
3543 | if (debug_threads) | |
3544 | { | |
00db26fa | 3545 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
ad071a30 PA |
3546 | { |
3547 | char *str; | |
3548 | ||
3549 | str = target_waitstatus_to_string (&event_child->waitstatus); | |
3550 | debug_printf ("LWP %ld: extended event with waitstatus %s\n", | |
3551 | lwpid_of (get_lwp_thread (event_child)), str); | |
3552 | xfree (str); | |
3553 | } | |
0bfdf32f | 3554 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
3555 | { |
3556 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 3557 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 3558 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 3559 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 3560 | } |
15c66dd6 | 3561 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 3562 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 3563 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 3564 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 3565 | if (debug_threads) |
87ce2a04 | 3566 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
3567 | } |
3568 | ||
3569 | /* Alright, we're going to report a stop. */ | |
3570 | ||
582511be | 3571 | if (!stabilizing_threads) |
6bf5e0ba PA |
3572 | { |
3573 | /* In all-stop, stop all threads. */ | |
582511be PA |
3574 | if (!non_stop) |
3575 | stop_all_lwps (0, NULL); | |
6bf5e0ba PA |
3576 | |
3577 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3578 | from among those that have had events. Giving equal priority | |
3579 | to all LWPs that have had events helps prevent | |
3580 | starvation. */ | |
3581 | if (ptid_equal (ptid, minus_one_ptid)) | |
3582 | { | |
3583 | event_child->status_pending_p = 1; | |
3584 | event_child->status_pending = w; | |
3585 | ||
3586 | select_event_lwp (&event_child); | |
3587 | ||
0bfdf32f GB |
3588 | /* current_thread and event_child must stay in sync. */ |
3589 | current_thread = get_lwp_thread (event_child); | |
ee1e2d4f | 3590 | |
6bf5e0ba PA |
3591 | event_child->status_pending_p = 0; |
3592 | w = event_child->status_pending; | |
3593 | } | |
3594 | ||
c03e6ccc | 3595 | if (step_over_finished) |
582511be PA |
3596 | { |
3597 | if (!non_stop) | |
3598 | { | |
3599 | /* If we were doing a step-over, all other threads but | |
3600 | the stepping one had been paused in start_step_over, | |
3601 | with their suspend counts incremented. We don't want | |
3602 | to do a full unstop/unpause, because we're in | |
3603 | all-stop mode (so we want threads stopped), but we | |
3604 | still need to unsuspend the other threads, to | |
3605 | decrement their `suspended' count back. */ | |
3606 | unsuspend_all_lwps (event_child); | |
3607 | } | |
3608 | else | |
3609 | { | |
3610 | /* If we just finished a step-over, then all threads had | |
3611 | been momentarily paused. In all-stop, that's fine, | |
3612 | we want threads stopped by now anyway. In non-stop, | |
3613 | we need to re-resume threads that GDB wanted to be | |
3614 | running. */ | |
3615 | unstop_all_lwps (1, event_child); | |
3616 | } | |
3617 | } | |
c03e6ccc | 3618 | |
fa593d66 | 3619 | /* Stabilize threads (move out of jump pads). */ |
582511be PA |
3620 | if (!non_stop) |
3621 | stabilize_threads (); | |
6bf5e0ba PA |
3622 | } |
3623 | else | |
3624 | { | |
3625 | /* If we just finished a step-over, then all threads had been | |
3626 | momentarily paused. In all-stop, that's fine, we want | |
3627 | threads stopped by now anyway. In non-stop, we need to | |
3628 | re-resume threads that GDB wanted to be running. */ | |
3629 | if (step_over_finished) | |
7984d532 | 3630 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3631 | } |
3632 | ||
00db26fa | 3633 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
de0d863e | 3634 | { |
00db26fa PA |
3635 | /* If the reported event is an exit, fork, vfork or exec, let |
3636 | GDB know. */ | |
3637 | *ourstatus = event_child->waitstatus; | |
de0d863e DB |
3638 | /* Clear the event lwp's waitstatus since we handled it already. */ |
3639 | event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3640 | } | |
3641 | else | |
3642 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
5b1c542e | 3643 | |
582511be | 3644 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3645 | it was a software breakpoint, and the client doesn't know we can |
3646 | adjust the breakpoint ourselves. */ | |
3647 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3648 | && !swbreak_feature) | |
582511be PA |
3649 | { |
3650 | int decr_pc = the_low_target.decr_pc_after_break; | |
3651 | ||
3652 | if (decr_pc != 0) | |
3653 | { | |
3654 | struct regcache *regcache | |
3655 | = get_thread_regcache (current_thread, 1); | |
3656 | (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc); | |
3657 | } | |
3658 | } | |
3659 | ||
82075af2 JS |
3660 | if (WSTOPSIG (w) == SYSCALL_SIGTRAP) |
3661 | { | |
3662 | int sysret; | |
3663 | ||
3664 | get_syscall_trapinfo (event_child, | |
3665 | &ourstatus->value.syscall_number, &sysret); | |
3666 | ourstatus->kind = event_child->syscall_state; | |
3667 | } | |
3668 | else if (current_thread->last_resume_kind == resume_stop | |
3669 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
3670 | { |
3671 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3672 | and it stopped cleanly, so report as SIG0. The use of | |
3673 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3674 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3675 | } |
0bfdf32f | 3676 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3677 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3678 | { |
3679 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3680 | but, it stopped for other reasons. */ |
2ea28649 | 3681 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 | 3682 | } |
de0d863e | 3683 | else if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
bd99dc85 | 3684 | { |
2ea28649 | 3685 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3686 | } |
3687 | ||
d50171e4 PA |
3688 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
3689 | ||
bd99dc85 | 3690 | if (debug_threads) |
87ce2a04 DE |
3691 | { |
3692 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
0bfdf32f | 3693 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3694 | ourstatus->kind, ourstatus->value.sig); |
3695 | debug_exit (); | |
3696 | } | |
bd99dc85 | 3697 | |
65706a29 PA |
3698 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3699 | return filter_exit_event (event_child, ourstatus); | |
3700 | ||
0bfdf32f | 3701 | return ptid_of (current_thread); |
bd99dc85 PA |
3702 | } |
3703 | ||
3704 | /* Get rid of any pending event in the pipe. */ | |
3705 | static void | |
3706 | async_file_flush (void) | |
3707 | { | |
3708 | int ret; | |
3709 | char buf; | |
3710 | ||
3711 | do | |
3712 | ret = read (linux_event_pipe[0], &buf, 1); | |
3713 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3714 | } | |
3715 | ||
3716 | /* Put something in the pipe, so the event loop wakes up. */ | |
3717 | static void | |
3718 | async_file_mark (void) | |
3719 | { | |
3720 | int ret; | |
3721 | ||
3722 | async_file_flush (); | |
3723 | ||
3724 | do | |
3725 | ret = write (linux_event_pipe[1], "+", 1); | |
3726 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3727 | ||
3728 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3729 | be awakened anyway. */ | |
3730 | } | |
3731 | ||
95954743 PA |
3732 | static ptid_t |
3733 | linux_wait (ptid_t ptid, | |
3734 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 3735 | { |
95954743 | 3736 | ptid_t event_ptid; |
bd99dc85 | 3737 | |
bd99dc85 PA |
3738 | /* Flush the async file first. */ |
3739 | if (target_is_async_p ()) | |
3740 | async_file_flush (); | |
3741 | ||
582511be PA |
3742 | do |
3743 | { | |
3744 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); | |
3745 | } | |
3746 | while ((target_options & TARGET_WNOHANG) == 0 | |
3747 | && ptid_equal (event_ptid, null_ptid) | |
3748 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); | |
bd99dc85 PA |
3749 | |
3750 | /* If at least one stop was reported, there may be more. A single | |
3751 | SIGCHLD can signal more than one child stop. */ | |
3752 | if (target_is_async_p () | |
3753 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 3754 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
3755 | async_file_mark (); |
3756 | ||
3757 | return event_ptid; | |
da6d8c04 DJ |
3758 | } |
3759 | ||
c5f62d5f | 3760 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3761 | |
3762 | static int | |
a1928bad | 3763 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3764 | { |
4a6ed09b | 3765 | int ret; |
fd500816 | 3766 | |
4a6ed09b PA |
3767 | errno = 0; |
3768 | ret = syscall (__NR_tkill, lwpid, signo); | |
3769 | if (errno == ENOSYS) | |
3770 | { | |
3771 | /* If tkill fails, then we are not using nptl threads, a | |
3772 | configuration we no longer support. */ | |
3773 | perror_with_name (("tkill")); | |
3774 | } | |
3775 | return ret; | |
fd500816 DJ |
3776 | } |
3777 | ||
964e4306 PA |
3778 | void |
3779 | linux_stop_lwp (struct lwp_info *lwp) | |
3780 | { | |
3781 | send_sigstop (lwp); | |
3782 | } | |
3783 | ||
0d62e5e8 | 3784 | static void |
02fc4de7 | 3785 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3786 | { |
bd99dc85 | 3787 | int pid; |
0d62e5e8 | 3788 | |
d86d4aaf | 3789 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3790 | |
0d62e5e8 DJ |
3791 | /* If we already have a pending stop signal for this process, don't |
3792 | send another. */ | |
54a0b537 | 3793 | if (lwp->stop_expected) |
0d62e5e8 | 3794 | { |
ae13219e | 3795 | if (debug_threads) |
87ce2a04 | 3796 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3797 | |
0d62e5e8 DJ |
3798 | return; |
3799 | } | |
3800 | ||
3801 | if (debug_threads) | |
87ce2a04 | 3802 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3803 | |
d50171e4 | 3804 | lwp->stop_expected = 1; |
bd99dc85 | 3805 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3806 | } |
3807 | ||
7984d532 PA |
3808 | static int |
3809 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 | 3810 | { |
d86d4aaf DE |
3811 | struct thread_info *thread = (struct thread_info *) entry; |
3812 | struct lwp_info *lwp = get_thread_lwp (thread); | |
02fc4de7 | 3813 | |
7984d532 PA |
3814 | /* Ignore EXCEPT. */ |
3815 | if (lwp == except) | |
3816 | return 0; | |
3817 | ||
02fc4de7 | 3818 | if (lwp->stopped) |
7984d532 | 3819 | return 0; |
02fc4de7 PA |
3820 | |
3821 | send_sigstop (lwp); | |
7984d532 PA |
3822 | return 0; |
3823 | } | |
3824 | ||
3825 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3826 | yet. */ | |
3827 | static int | |
3828 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
3829 | void *except) | |
3830 | { | |
d86d4aaf DE |
3831 | struct thread_info *thread = (struct thread_info *) entry; |
3832 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
3833 | |
3834 | /* Ignore EXCEPT. */ | |
3835 | if (lwp == except) | |
3836 | return 0; | |
3837 | ||
863d01bd | 3838 | lwp_suspended_inc (lwp); |
7984d532 PA |
3839 | |
3840 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
3841 | } |
3842 | ||
95954743 PA |
3843 | static void |
3844 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3845 | { | |
95954743 PA |
3846 | /* Store the exit status for later. */ |
3847 | lwp->status_pending_p = 1; | |
3848 | lwp->status_pending = wstat; | |
3849 | ||
00db26fa PA |
3850 | /* Store in waitstatus as well, as there's nothing else to process |
3851 | for this event. */ | |
3852 | if (WIFEXITED (wstat)) | |
3853 | { | |
3854 | lwp->waitstatus.kind = TARGET_WAITKIND_EXITED; | |
3855 | lwp->waitstatus.value.integer = WEXITSTATUS (wstat); | |
3856 | } | |
3857 | else if (WIFSIGNALED (wstat)) | |
3858 | { | |
3859 | lwp->waitstatus.kind = TARGET_WAITKIND_SIGNALLED; | |
3860 | lwp->waitstatus.value.sig = gdb_signal_from_host (WTERMSIG (wstat)); | |
3861 | } | |
3862 | ||
95954743 PA |
3863 | /* Prevent trying to stop it. */ |
3864 | lwp->stopped = 1; | |
3865 | ||
3866 | /* No further stops are expected from a dead lwp. */ | |
3867 | lwp->stop_expected = 0; | |
3868 | } | |
3869 | ||
00db26fa PA |
3870 | /* Return true if LWP has exited already, and has a pending exit event |
3871 | to report to GDB. */ | |
3872 | ||
3873 | static int | |
3874 | lwp_is_marked_dead (struct lwp_info *lwp) | |
3875 | { | |
3876 | return (lwp->status_pending_p | |
3877 | && (WIFEXITED (lwp->status_pending) | |
3878 | || WIFSIGNALED (lwp->status_pending))); | |
3879 | } | |
3880 | ||
fa96cb38 PA |
3881 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
3882 | ||
0d62e5e8 | 3883 | static void |
fa96cb38 | 3884 | wait_for_sigstop (void) |
0d62e5e8 | 3885 | { |
0bfdf32f | 3886 | struct thread_info *saved_thread; |
95954743 | 3887 | ptid_t saved_tid; |
fa96cb38 PA |
3888 | int wstat; |
3889 | int ret; | |
0d62e5e8 | 3890 | |
0bfdf32f GB |
3891 | saved_thread = current_thread; |
3892 | if (saved_thread != NULL) | |
3893 | saved_tid = saved_thread->entry.id; | |
bd99dc85 | 3894 | else |
95954743 | 3895 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3896 | |
d50171e4 | 3897 | if (debug_threads) |
fa96cb38 | 3898 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3899 | |
fa96cb38 PA |
3900 | /* Passing NULL_PTID as filter indicates we want all events to be |
3901 | left pending. Eventually this returns when there are no | |
3902 | unwaited-for children left. */ | |
3903 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
3904 | &wstat, __WALL); | |
3905 | gdb_assert (ret == -1); | |
0d62e5e8 | 3906 | |
0bfdf32f GB |
3907 | if (saved_thread == NULL || linux_thread_alive (saved_tid)) |
3908 | current_thread = saved_thread; | |
0d62e5e8 DJ |
3909 | else |
3910 | { | |
3911 | if (debug_threads) | |
87ce2a04 | 3912 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3913 | |
f0db101d PA |
3914 | /* We can't change the current inferior behind GDB's back, |
3915 | otherwise, a subsequent command may apply to the wrong | |
3916 | process. */ | |
3917 | current_thread = NULL; | |
0d62e5e8 DJ |
3918 | } |
3919 | } | |
3920 | ||
fa593d66 PA |
3921 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3922 | move it out, because we need to report the stop event to GDB. For | |
3923 | example, if the user puts a breakpoint in the jump pad, it's | |
3924 | because she wants to debug it. */ | |
3925 | ||
3926 | static int | |
3927 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3928 | { | |
d86d4aaf DE |
3929 | struct thread_info *thread = (struct thread_info *) entry; |
3930 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 | 3931 | |
863d01bd PA |
3932 | if (lwp->suspended != 0) |
3933 | { | |
3934 | internal_error (__FILE__, __LINE__, | |
3935 | "LWP %ld is suspended, suspended=%d\n", | |
3936 | lwpid_of (thread), lwp->suspended); | |
3937 | } | |
fa593d66 PA |
3938 | gdb_assert (lwp->stopped); |
3939 | ||
3940 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3941 | return (supports_fast_tracepoints () | |
58b4daa5 | 3942 | && agent_loaded_p () |
fa593d66 | 3943 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 3944 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3945 | || thread->last_resume_kind == resume_step) |
3946 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3947 | } | |
3948 | ||
3949 | static void | |
3950 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3951 | { | |
d86d4aaf | 3952 | struct thread_info *thread = (struct thread_info *) entry; |
f0ce0d3a | 3953 | struct thread_info *saved_thread; |
d86d4aaf | 3954 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 PA |
3955 | int *wstat; |
3956 | ||
863d01bd PA |
3957 | if (lwp->suspended != 0) |
3958 | { | |
3959 | internal_error (__FILE__, __LINE__, | |
3960 | "LWP %ld is suspended, suspended=%d\n", | |
3961 | lwpid_of (thread), lwp->suspended); | |
3962 | } | |
fa593d66 PA |
3963 | gdb_assert (lwp->stopped); |
3964 | ||
f0ce0d3a PA |
3965 | /* For gdb_breakpoint_here. */ |
3966 | saved_thread = current_thread; | |
3967 | current_thread = thread; | |
3968 | ||
fa593d66 PA |
3969 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; |
3970 | ||
3971 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3972 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 3973 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3974 | && thread->last_resume_kind != resume_step |
3975 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3976 | { | |
3977 | if (debug_threads) | |
87ce2a04 | 3978 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3979 | lwpid_of (thread)); |
fa593d66 PA |
3980 | |
3981 | if (wstat) | |
3982 | { | |
3983 | lwp->status_pending_p = 0; | |
3984 | enqueue_one_deferred_signal (lwp, wstat); | |
3985 | ||
3986 | if (debug_threads) | |
87ce2a04 DE |
3987 | debug_printf ("Signal %d for LWP %ld deferred " |
3988 | "(in jump pad)\n", | |
d86d4aaf | 3989 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
3990 | } |
3991 | ||
3992 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3993 | } | |
3994 | else | |
863d01bd | 3995 | lwp_suspended_inc (lwp); |
f0ce0d3a PA |
3996 | |
3997 | current_thread = saved_thread; | |
fa593d66 PA |
3998 | } |
3999 | ||
4000 | static int | |
4001 | lwp_running (struct inferior_list_entry *entry, void *data) | |
4002 | { | |
d86d4aaf DE |
4003 | struct thread_info *thread = (struct thread_info *) entry; |
4004 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 | 4005 | |
00db26fa | 4006 | if (lwp_is_marked_dead (lwp)) |
fa593d66 PA |
4007 | return 0; |
4008 | if (lwp->stopped) | |
4009 | return 0; | |
4010 | return 1; | |
4011 | } | |
4012 | ||
7984d532 PA |
4013 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
4014 | If SUSPEND, then also increase the suspend count of every LWP, | |
4015 | except EXCEPT. */ | |
4016 | ||
0d62e5e8 | 4017 | static void |
7984d532 | 4018 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 4019 | { |
bde24c0a PA |
4020 | /* Should not be called recursively. */ |
4021 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
4022 | ||
87ce2a04 DE |
4023 | if (debug_threads) |
4024 | { | |
4025 | debug_enter (); | |
4026 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
4027 | suspend ? "stop-and-suspend" : "stop", | |
4028 | except != NULL | |
d86d4aaf | 4029 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
4030 | : "none"); |
4031 | } | |
4032 | ||
bde24c0a PA |
4033 | stopping_threads = (suspend |
4034 | ? STOPPING_AND_SUSPENDING_THREADS | |
4035 | : STOPPING_THREADS); | |
7984d532 PA |
4036 | |
4037 | if (suspend) | |
d86d4aaf | 4038 | find_inferior (&all_threads, suspend_and_send_sigstop_callback, except); |
7984d532 | 4039 | else |
d86d4aaf | 4040 | find_inferior (&all_threads, send_sigstop_callback, except); |
fa96cb38 | 4041 | wait_for_sigstop (); |
bde24c0a | 4042 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
4043 | |
4044 | if (debug_threads) | |
4045 | { | |
4046 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
4047 | "back to !stopping\n"); | |
4048 | debug_exit (); | |
4049 | } | |
0d62e5e8 DJ |
4050 | } |
4051 | ||
863d01bd PA |
4052 | /* Enqueue one signal in the chain of signals which need to be |
4053 | delivered to this process on next resume. */ | |
4054 | ||
4055 | static void | |
4056 | enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info) | |
4057 | { | |
8d749320 | 4058 | struct pending_signals *p_sig = XNEW (struct pending_signals); |
863d01bd | 4059 | |
863d01bd PA |
4060 | p_sig->prev = lwp->pending_signals; |
4061 | p_sig->signal = signal; | |
4062 | if (info == NULL) | |
4063 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
4064 | else | |
4065 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
4066 | lwp->pending_signals = p_sig; | |
4067 | } | |
4068 | ||
fa5308bd AT |
4069 | /* Install breakpoints for software single stepping. */ |
4070 | ||
4071 | static void | |
4072 | install_software_single_step_breakpoints (struct lwp_info *lwp) | |
4073 | { | |
4074 | int i; | |
4075 | CORE_ADDR pc; | |
4076 | struct regcache *regcache = get_thread_regcache (current_thread, 1); | |
4077 | VEC (CORE_ADDR) *next_pcs = NULL; | |
4078 | struct cleanup *old_chain = make_cleanup (VEC_cleanup (CORE_ADDR), &next_pcs); | |
4079 | ||
4d18591b | 4080 | next_pcs = (*the_low_target.get_next_pcs) (regcache); |
fa5308bd AT |
4081 | |
4082 | for (i = 0; VEC_iterate (CORE_ADDR, next_pcs, i, pc); ++i) | |
4083 | set_reinsert_breakpoint (pc); | |
4084 | ||
4085 | do_cleanups (old_chain); | |
4086 | } | |
4087 | ||
7fe5e27e AT |
4088 | /* Single step via hardware or software single step. |
4089 | Return 1 if hardware single stepping, 0 if software single stepping | |
4090 | or can't single step. */ | |
4091 | ||
4092 | static int | |
4093 | single_step (struct lwp_info* lwp) | |
4094 | { | |
4095 | int step = 0; | |
4096 | ||
4097 | if (can_hardware_single_step ()) | |
4098 | { | |
4099 | step = 1; | |
4100 | } | |
4101 | else if (can_software_single_step ()) | |
4102 | { | |
4103 | install_software_single_step_breakpoints (lwp); | |
4104 | step = 0; | |
4105 | } | |
4106 | else | |
4107 | { | |
4108 | if (debug_threads) | |
4109 | debug_printf ("stepping is not implemented on this target"); | |
4110 | } | |
4111 | ||
4112 | return step; | |
4113 | } | |
4114 | ||
23f238d3 PA |
4115 | /* Resume execution of LWP. If STEP is nonzero, single-step it. If |
4116 | SIGNAL is nonzero, give it that signal. */ | |
da6d8c04 | 4117 | |
ce3a066d | 4118 | static void |
23f238d3 PA |
4119 | linux_resume_one_lwp_throw (struct lwp_info *lwp, |
4120 | int step, int signal, siginfo_t *info) | |
da6d8c04 | 4121 | { |
d86d4aaf | 4122 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4123 | struct thread_info *saved_thread; |
fa593d66 | 4124 | int fast_tp_collecting; |
82075af2 | 4125 | int ptrace_request; |
c06cbd92 YQ |
4126 | struct process_info *proc = get_thread_process (thread); |
4127 | ||
4128 | /* Note that target description may not be initialised | |
4129 | (proc->tdesc == NULL) at this point because the program hasn't | |
4130 | stopped at the first instruction yet. It means GDBserver skips | |
4131 | the extra traps from the wrapper program (see option --wrapper). | |
4132 | Code in this function that requires register access should be | |
4133 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 4134 | |
54a0b537 | 4135 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
4136 | return; |
4137 | ||
65706a29 PA |
4138 | gdb_assert (lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
4139 | ||
fa593d66 PA |
4140 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
4141 | ||
4142 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
4143 | ||
219f2f23 PA |
4144 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
4145 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 4146 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
4147 | { |
4148 | /* Collecting 'while-stepping' actions doesn't make sense | |
4149 | anymore. */ | |
d86d4aaf | 4150 | release_while_stepping_state_list (thread); |
219f2f23 PA |
4151 | } |
4152 | ||
0d62e5e8 DJ |
4153 | /* If we have pending signals or status, and a new signal, enqueue the |
4154 | signal. Also enqueue the signal if we are waiting to reinsert a | |
4155 | breakpoint; it will be picked up again below. */ | |
4156 | if (signal != 0 | |
fa593d66 PA |
4157 | && (lwp->status_pending_p |
4158 | || lwp->pending_signals != NULL | |
4159 | || lwp->bp_reinsert != 0 | |
4160 | || fast_tp_collecting)) | |
fdbd04a8 | 4161 | enqueue_pending_signal (lwp, signal, info); |
0d62e5e8 | 4162 | |
d50171e4 PA |
4163 | if (lwp->status_pending_p) |
4164 | { | |
4165 | if (debug_threads) | |
87ce2a04 DE |
4166 | debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);" |
4167 | " has pending status\n", | |
d86d4aaf | 4168 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 4169 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
4170 | return; |
4171 | } | |
0d62e5e8 | 4172 | |
0bfdf32f GB |
4173 | saved_thread = current_thread; |
4174 | current_thread = thread; | |
0d62e5e8 DJ |
4175 | |
4176 | if (debug_threads) | |
87ce2a04 | 4177 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", |
d86d4aaf | 4178 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 4179 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
4180 | |
4181 | /* This bit needs some thinking about. If we get a signal that | |
4182 | we must report while a single-step reinsert is still pending, | |
4183 | we often end up resuming the thread. It might be better to | |
4184 | (ew) allow a stack of pending events; then we could be sure that | |
4185 | the reinsert happened right away and not lose any signals. | |
4186 | ||
4187 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 4188 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
4189 | complete correctness, so it won't solve that problem. It may be |
4190 | worthwhile just to solve this one, however. */ | |
54a0b537 | 4191 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
4192 | { |
4193 | if (debug_threads) | |
87ce2a04 DE |
4194 | debug_printf (" pending reinsert at 0x%s\n", |
4195 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 4196 | |
85e00e85 | 4197 | if (can_hardware_single_step ()) |
d50171e4 | 4198 | { |
fa593d66 PA |
4199 | if (fast_tp_collecting == 0) |
4200 | { | |
4201 | if (step == 0) | |
4202 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
4203 | if (lwp->suspended) | |
4204 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
4205 | lwp->suspended); | |
4206 | } | |
d50171e4 PA |
4207 | |
4208 | step = 1; | |
4209 | } | |
0d62e5e8 DJ |
4210 | |
4211 | /* Postpone any pending signal. It was enqueued above. */ | |
4212 | signal = 0; | |
4213 | } | |
4214 | ||
fa593d66 PA |
4215 | if (fast_tp_collecting == 1) |
4216 | { | |
4217 | if (debug_threads) | |
87ce2a04 DE |
4218 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4219 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 4220 | lwpid_of (thread)); |
fa593d66 PA |
4221 | |
4222 | /* Postpone any pending signal. It was enqueued above. */ | |
4223 | signal = 0; | |
4224 | } | |
4225 | else if (fast_tp_collecting == 2) | |
4226 | { | |
4227 | if (debug_threads) | |
87ce2a04 DE |
4228 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4229 | " single-stepping\n", | |
d86d4aaf | 4230 | lwpid_of (thread)); |
fa593d66 PA |
4231 | |
4232 | if (can_hardware_single_step ()) | |
4233 | step = 1; | |
4234 | else | |
38e08fca GB |
4235 | { |
4236 | internal_error (__FILE__, __LINE__, | |
4237 | "moving out of jump pad single-stepping" | |
4238 | " not implemented on this target"); | |
4239 | } | |
fa593d66 PA |
4240 | |
4241 | /* Postpone any pending signal. It was enqueued above. */ | |
4242 | signal = 0; | |
4243 | } | |
4244 | ||
219f2f23 PA |
4245 | /* If we have while-stepping actions in this thread set it stepping. |
4246 | If we have a signal to deliver, it may or may not be set to | |
4247 | SIG_IGN, we don't know. Assume so, and allow collecting | |
4248 | while-stepping into a signal handler. A possible smart thing to | |
4249 | do would be to set an internal breakpoint at the signal return | |
4250 | address, continue, and carry on catching this while-stepping | |
4251 | action only when that breakpoint is hit. A future | |
4252 | enhancement. */ | |
7fe5e27e | 4253 | if (thread->while_stepping != NULL) |
219f2f23 PA |
4254 | { |
4255 | if (debug_threads) | |
87ce2a04 | 4256 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 4257 | lwpid_of (thread)); |
7fe5e27e AT |
4258 | |
4259 | step = single_step (lwp); | |
219f2f23 PA |
4260 | } |
4261 | ||
c06cbd92 | 4262 | if (proc->tdesc != NULL && the_low_target.get_pc != NULL) |
0d62e5e8 | 4263 | { |
0bfdf32f | 4264 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be PA |
4265 | |
4266 | lwp->stop_pc = (*the_low_target.get_pc) (regcache); | |
4267 | ||
4268 | if (debug_threads) | |
4269 | { | |
4270 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
4271 | (long) lwp->stop_pc); | |
4272 | } | |
0d62e5e8 DJ |
4273 | } |
4274 | ||
fa593d66 PA |
4275 | /* If we have pending signals, consume one unless we are trying to |
4276 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
4277 | collect. */ | |
4278 | if (lwp->pending_signals != NULL | |
4279 | && lwp->bp_reinsert == 0 | |
4280 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
4281 | { |
4282 | struct pending_signals **p_sig; | |
4283 | ||
54a0b537 | 4284 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
4285 | while ((*p_sig)->prev != NULL) |
4286 | p_sig = &(*p_sig)->prev; | |
4287 | ||
4288 | signal = (*p_sig)->signal; | |
32ca6d61 | 4289 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 4290 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4291 | &(*p_sig)->info); |
32ca6d61 | 4292 | |
0d62e5e8 DJ |
4293 | free (*p_sig); |
4294 | *p_sig = NULL; | |
4295 | } | |
4296 | ||
aa5ca48f DE |
4297 | if (the_low_target.prepare_to_resume != NULL) |
4298 | the_low_target.prepare_to_resume (lwp); | |
4299 | ||
d86d4aaf | 4300 | regcache_invalidate_thread (thread); |
da6d8c04 | 4301 | errno = 0; |
54a0b537 | 4302 | lwp->stepping = step; |
82075af2 JS |
4303 | if (step) |
4304 | ptrace_request = PTRACE_SINGLESTEP; | |
4305 | else if (gdb_catching_syscalls_p (lwp)) | |
4306 | ptrace_request = PTRACE_SYSCALL; | |
4307 | else | |
4308 | ptrace_request = PTRACE_CONT; | |
4309 | ptrace (ptrace_request, | |
4310 | lwpid_of (thread), | |
b8e1b30e | 4311 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
4312 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4313 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4314 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 4315 | |
0bfdf32f | 4316 | current_thread = saved_thread; |
da6d8c04 | 4317 | if (errno) |
23f238d3 PA |
4318 | perror_with_name ("resuming thread"); |
4319 | ||
4320 | /* Successfully resumed. Clear state that no longer makes sense, | |
4321 | and mark the LWP as running. Must not do this before resuming | |
4322 | otherwise if that fails other code will be confused. E.g., we'd | |
4323 | later try to stop the LWP and hang forever waiting for a stop | |
4324 | status. Note that we must not throw after this is cleared, | |
4325 | otherwise handle_zombie_lwp_error would get confused. */ | |
4326 | lwp->stopped = 0; | |
4327 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4328 | } | |
4329 | ||
4330 | /* Called when we try to resume a stopped LWP and that errors out. If | |
4331 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
4332 | or about to become), discard the error, clear any pending status | |
4333 | the LWP may have, and return true (we'll collect the exit status | |
4334 | soon enough). Otherwise, return false. */ | |
4335 | ||
4336 | static int | |
4337 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
4338 | { | |
4339 | struct thread_info *thread = get_lwp_thread (lp); | |
4340 | ||
4341 | /* If we get an error after resuming the LWP successfully, we'd | |
4342 | confuse !T state for the LWP being gone. */ | |
4343 | gdb_assert (lp->stopped); | |
4344 | ||
4345 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
4346 | because even if ptrace failed with ESRCH, the tracee may be "not | |
4347 | yet fully dead", but already refusing ptrace requests. In that | |
4348 | case the tracee has 'R (Running)' state for a little bit | |
4349 | (observed in Linux 3.18). See also the note on ESRCH in the | |
4350 | ptrace(2) man page. Instead, check whether the LWP has any state | |
4351 | other than ptrace-stopped. */ | |
4352 | ||
4353 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
4354 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 4355 | { |
23f238d3 PA |
4356 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
4357 | lp->status_pending_p = 0; | |
4358 | return 1; | |
4359 | } | |
4360 | return 0; | |
4361 | } | |
4362 | ||
4363 | /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP | |
4364 | disappears while we try to resume it. */ | |
3221518c | 4365 | |
23f238d3 PA |
4366 | static void |
4367 | linux_resume_one_lwp (struct lwp_info *lwp, | |
4368 | int step, int signal, siginfo_t *info) | |
4369 | { | |
4370 | TRY | |
4371 | { | |
4372 | linux_resume_one_lwp_throw (lwp, step, signal, info); | |
4373 | } | |
4374 | CATCH (ex, RETURN_MASK_ERROR) | |
4375 | { | |
4376 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
4377 | throw_exception (ex); | |
3221518c | 4378 | } |
23f238d3 | 4379 | END_CATCH |
da6d8c04 DJ |
4380 | } |
4381 | ||
2bd7c093 PA |
4382 | struct thread_resume_array |
4383 | { | |
4384 | struct thread_resume *resume; | |
4385 | size_t n; | |
4386 | }; | |
64386c31 | 4387 | |
ebcf782c DE |
4388 | /* This function is called once per thread via find_inferior. |
4389 | ARG is a pointer to a thread_resume_array struct. | |
4390 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
4391 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
4392 | |
4393 | This algorithm is O(threads * resume elements), but resume elements | |
4394 | is small (and will remain small at least until GDB supports thread | |
4395 | suspension). */ | |
ebcf782c | 4396 | |
2bd7c093 PA |
4397 | static int |
4398 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 4399 | { |
d86d4aaf DE |
4400 | struct thread_info *thread = (struct thread_info *) entry; |
4401 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 4402 | int ndx; |
2bd7c093 | 4403 | struct thread_resume_array *r; |
64386c31 | 4404 | |
9a3c8263 | 4405 | r = (struct thread_resume_array *) arg; |
64386c31 | 4406 | |
2bd7c093 | 4407 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
4408 | { |
4409 | ptid_t ptid = r->resume[ndx].thread; | |
4410 | if (ptid_equal (ptid, minus_one_ptid) | |
4411 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
4412 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
4413 | of PID'. */ | |
d86d4aaf | 4414 | || (ptid_get_pid (ptid) == pid_of (thread) |
0c9070b3 YQ |
4415 | && (ptid_is_pid (ptid) |
4416 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 4417 | { |
d50171e4 | 4418 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 4419 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4420 | { |
4421 | if (debug_threads) | |
87ce2a04 DE |
4422 | debug_printf ("already %s LWP %ld at GDB's request\n", |
4423 | (thread->last_status.kind | |
4424 | == TARGET_WAITKIND_STOPPED) | |
4425 | ? "stopped" | |
4426 | : "stopping", | |
d86d4aaf | 4427 | lwpid_of (thread)); |
d50171e4 PA |
4428 | |
4429 | continue; | |
4430 | } | |
4431 | ||
95954743 | 4432 | lwp->resume = &r->resume[ndx]; |
8336d594 | 4433 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 4434 | |
c2d6af84 PA |
4435 | lwp->step_range_start = lwp->resume->step_range_start; |
4436 | lwp->step_range_end = lwp->resume->step_range_end; | |
4437 | ||
fa593d66 PA |
4438 | /* If we had a deferred signal to report, dequeue one now. |
4439 | This can happen if LWP gets more than one signal while | |
4440 | trying to get out of a jump pad. */ | |
4441 | if (lwp->stopped | |
4442 | && !lwp->status_pending_p | |
4443 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
4444 | { | |
4445 | lwp->status_pending_p = 1; | |
4446 | ||
4447 | if (debug_threads) | |
87ce2a04 DE |
4448 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
4449 | "leaving status pending.\n", | |
d86d4aaf DE |
4450 | WSTOPSIG (lwp->status_pending), |
4451 | lwpid_of (thread)); | |
fa593d66 PA |
4452 | } |
4453 | ||
95954743 PA |
4454 | return 0; |
4455 | } | |
4456 | } | |
2bd7c093 PA |
4457 | |
4458 | /* No resume action for this thread. */ | |
4459 | lwp->resume = NULL; | |
64386c31 | 4460 | |
2bd7c093 | 4461 | return 0; |
5544ad89 DJ |
4462 | } |
4463 | ||
20ad9378 DE |
4464 | /* find_inferior callback for linux_resume. |
4465 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 4466 | |
bd99dc85 PA |
4467 | static int |
4468 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 4469 | { |
d86d4aaf DE |
4470 | struct thread_info *thread = (struct thread_info *) entry; |
4471 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 4472 | |
bd99dc85 PA |
4473 | /* LWPs which will not be resumed are not interesting, because |
4474 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4475 | if (lwp->resume == NULL) |
bd99dc85 | 4476 | return 0; |
64386c31 | 4477 | |
582511be | 4478 | if (thread_still_has_status_pending_p (thread)) |
d50171e4 PA |
4479 | * (int *) flag_p = 1; |
4480 | ||
4481 | return 0; | |
4482 | } | |
4483 | ||
4484 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
4485 | internal breakpoint that we need to step over. It assumes that any | |
4486 | required STOP_PC adjustment has already been propagated to the | |
4487 | inferior's regcache. */ | |
4488 | ||
4489 | static int | |
4490 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
4491 | { | |
d86d4aaf DE |
4492 | struct thread_info *thread = (struct thread_info *) entry; |
4493 | struct lwp_info *lwp = get_thread_lwp (thread); | |
0bfdf32f | 4494 | struct thread_info *saved_thread; |
d50171e4 | 4495 | CORE_ADDR pc; |
c06cbd92 YQ |
4496 | struct process_info *proc = get_thread_process (thread); |
4497 | ||
4498 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4499 | don't have to do step over. */ | |
4500 | if (proc->tdesc == NULL) | |
4501 | return 0; | |
d50171e4 PA |
4502 | |
4503 | /* LWPs which will not be resumed are not interesting, because we | |
4504 | might not wait for them next time through linux_wait. */ | |
4505 | ||
4506 | if (!lwp->stopped) | |
4507 | { | |
4508 | if (debug_threads) | |
87ce2a04 | 4509 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 4510 | lwpid_of (thread)); |
d50171e4 PA |
4511 | return 0; |
4512 | } | |
4513 | ||
8336d594 | 4514 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4515 | { |
4516 | if (debug_threads) | |
87ce2a04 DE |
4517 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
4518 | " stopped\n", | |
d86d4aaf | 4519 | lwpid_of (thread)); |
d50171e4 PA |
4520 | return 0; |
4521 | } | |
4522 | ||
7984d532 PA |
4523 | gdb_assert (lwp->suspended >= 0); |
4524 | ||
4525 | if (lwp->suspended) | |
4526 | { | |
4527 | if (debug_threads) | |
87ce2a04 | 4528 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 4529 | lwpid_of (thread)); |
7984d532 PA |
4530 | return 0; |
4531 | } | |
4532 | ||
d50171e4 PA |
4533 | if (!lwp->need_step_over) |
4534 | { | |
4535 | if (debug_threads) | |
d86d4aaf | 4536 | debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread)); |
d50171e4 | 4537 | } |
5544ad89 | 4538 | |
bd99dc85 | 4539 | if (lwp->status_pending_p) |
d50171e4 PA |
4540 | { |
4541 | if (debug_threads) | |
87ce2a04 DE |
4542 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
4543 | " status.\n", | |
d86d4aaf | 4544 | lwpid_of (thread)); |
d50171e4 PA |
4545 | return 0; |
4546 | } | |
4547 | ||
4548 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4549 | or we have. */ | |
4550 | pc = get_pc (lwp); | |
4551 | ||
4552 | /* If the PC has changed since we stopped, then don't do anything, | |
4553 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4554 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4555 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4556 | command, or poked thread's registers herself. */ | |
4557 | if (pc != lwp->stop_pc) | |
4558 | { | |
4559 | if (debug_threads) | |
87ce2a04 DE |
4560 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
4561 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
4562 | lwpid_of (thread), |
4563 | paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
4564 | |
4565 | lwp->need_step_over = 0; | |
4566 | return 0; | |
4567 | } | |
4568 | ||
0bfdf32f GB |
4569 | saved_thread = current_thread; |
4570 | current_thread = thread; | |
d50171e4 | 4571 | |
8b07ae33 | 4572 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4573 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4574 | { |
8b07ae33 | 4575 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4576 | though. If the condition is being evaluated on the target's side |
4577 | and it evaluate to false, step over this breakpoint as well. */ | |
4578 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4579 | && gdb_condition_true_at_breakpoint (pc) |
4580 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
4581 | { |
4582 | if (debug_threads) | |
87ce2a04 DE |
4583 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
4584 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 4585 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4586 | |
0bfdf32f | 4587 | current_thread = saved_thread; |
8b07ae33 PA |
4588 | return 0; |
4589 | } | |
4590 | else | |
4591 | { | |
4592 | if (debug_threads) | |
87ce2a04 DE |
4593 | debug_printf ("Need step over [LWP %ld]? yes, " |
4594 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 4595 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4596 | |
8b07ae33 PA |
4597 | /* We've found an lwp that needs stepping over --- return 1 so |
4598 | that find_inferior stops looking. */ | |
0bfdf32f | 4599 | current_thread = saved_thread; |
8b07ae33 PA |
4600 | |
4601 | /* If the step over is cancelled, this is set again. */ | |
4602 | lwp->need_step_over = 0; | |
4603 | return 1; | |
4604 | } | |
d50171e4 PA |
4605 | } |
4606 | ||
0bfdf32f | 4607 | current_thread = saved_thread; |
d50171e4 PA |
4608 | |
4609 | if (debug_threads) | |
87ce2a04 DE |
4610 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
4611 | " at 0x%s\n", | |
d86d4aaf | 4612 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 4613 | |
bd99dc85 | 4614 | return 0; |
5544ad89 DJ |
4615 | } |
4616 | ||
d50171e4 PA |
4617 | /* Start a step-over operation on LWP. When LWP stopped at a |
4618 | breakpoint, to make progress, we need to remove the breakpoint out | |
4619 | of the way. If we let other threads run while we do that, they may | |
4620 | pass by the breakpoint location and miss hitting it. To avoid | |
4621 | that, a step-over momentarily stops all threads while LWP is | |
4622 | single-stepped while the breakpoint is temporarily uninserted from | |
4623 | the inferior. When the single-step finishes, we reinsert the | |
4624 | breakpoint, and let all threads that are supposed to be running, | |
4625 | run again. | |
4626 | ||
4627 | On targets that don't support hardware single-step, we don't | |
4628 | currently support full software single-stepping. Instead, we only | |
4629 | support stepping over the thread event breakpoint, by asking the | |
4630 | low target where to place a reinsert breakpoint. Since this | |
4631 | routine assumes the breakpoint being stepped over is a thread event | |
4632 | breakpoint, it usually assumes the return address of the current | |
4633 | function is a good enough place to set the reinsert breakpoint. */ | |
4634 | ||
4635 | static int | |
4636 | start_step_over (struct lwp_info *lwp) | |
4637 | { | |
d86d4aaf | 4638 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4639 | struct thread_info *saved_thread; |
d50171e4 PA |
4640 | CORE_ADDR pc; |
4641 | int step; | |
4642 | ||
4643 | if (debug_threads) | |
87ce2a04 | 4644 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 4645 | lwpid_of (thread)); |
d50171e4 | 4646 | |
7984d532 | 4647 | stop_all_lwps (1, lwp); |
863d01bd PA |
4648 | |
4649 | if (lwp->suspended != 0) | |
4650 | { | |
4651 | internal_error (__FILE__, __LINE__, | |
4652 | "LWP %ld suspended=%d\n", lwpid_of (thread), | |
4653 | lwp->suspended); | |
4654 | } | |
d50171e4 PA |
4655 | |
4656 | if (debug_threads) | |
87ce2a04 | 4657 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
4658 | |
4659 | /* Note, we should always reach here with an already adjusted PC, | |
4660 | either by GDB (if we're resuming due to GDB's request), or by our | |
4661 | caller, if we just finished handling an internal breakpoint GDB | |
4662 | shouldn't care about. */ | |
4663 | pc = get_pc (lwp); | |
4664 | ||
0bfdf32f GB |
4665 | saved_thread = current_thread; |
4666 | current_thread = thread; | |
d50171e4 PA |
4667 | |
4668 | lwp->bp_reinsert = pc; | |
4669 | uninsert_breakpoints_at (pc); | |
fa593d66 | 4670 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 | 4671 | |
7fe5e27e | 4672 | step = single_step (lwp); |
d50171e4 | 4673 | |
0bfdf32f | 4674 | current_thread = saved_thread; |
d50171e4 PA |
4675 | |
4676 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
4677 | ||
4678 | /* Require next event from this LWP. */ | |
d86d4aaf | 4679 | step_over_bkpt = thread->entry.id; |
d50171e4 PA |
4680 | return 1; |
4681 | } | |
4682 | ||
4683 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
4684 | start_step_over, if still there, and delete any reinsert | |
4685 | breakpoints we've set, on non hardware single-step targets. */ | |
4686 | ||
4687 | static int | |
4688 | finish_step_over (struct lwp_info *lwp) | |
4689 | { | |
4690 | if (lwp->bp_reinsert != 0) | |
4691 | { | |
4692 | if (debug_threads) | |
87ce2a04 | 4693 | debug_printf ("Finished step over.\n"); |
d50171e4 PA |
4694 | |
4695 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
4696 | may be no breakpoint to reinsert there by now. */ | |
4697 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4698 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4699 | |
4700 | lwp->bp_reinsert = 0; | |
4701 | ||
4702 | /* Delete any software-single-step reinsert breakpoints. No | |
4703 | longer needed. We don't have to worry about other threads | |
4704 | hitting this trap, and later not being able to explain it, | |
4705 | because we were stepping over a breakpoint, and we hold all | |
4706 | threads but LWP stopped while doing that. */ | |
4707 | if (!can_hardware_single_step ()) | |
4708 | delete_reinsert_breakpoints (); | |
4709 | ||
4710 | step_over_bkpt = null_ptid; | |
4711 | return 1; | |
4712 | } | |
4713 | else | |
4714 | return 0; | |
4715 | } | |
4716 | ||
863d01bd PA |
4717 | /* If there's a step over in progress, wait until all threads stop |
4718 | (that is, until the stepping thread finishes its step), and | |
4719 | unsuspend all lwps. The stepping thread ends with its status | |
4720 | pending, which is processed later when we get back to processing | |
4721 | events. */ | |
4722 | ||
4723 | static void | |
4724 | complete_ongoing_step_over (void) | |
4725 | { | |
4726 | if (!ptid_equal (step_over_bkpt, null_ptid)) | |
4727 | { | |
4728 | struct lwp_info *lwp; | |
4729 | int wstat; | |
4730 | int ret; | |
4731 | ||
4732 | if (debug_threads) | |
4733 | debug_printf ("detach: step over in progress, finish it first\n"); | |
4734 | ||
4735 | /* Passing NULL_PTID as filter indicates we want all events to | |
4736 | be left pending. Eventually this returns when there are no | |
4737 | unwaited-for children left. */ | |
4738 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
4739 | &wstat, __WALL); | |
4740 | gdb_assert (ret == -1); | |
4741 | ||
4742 | lwp = find_lwp_pid (step_over_bkpt); | |
4743 | if (lwp != NULL) | |
4744 | finish_step_over (lwp); | |
4745 | step_over_bkpt = null_ptid; | |
4746 | unsuspend_all_lwps (lwp); | |
4747 | } | |
4748 | } | |
4749 | ||
5544ad89 DJ |
4750 | /* This function is called once per thread. We check the thread's resume |
4751 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 4752 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 4753 | |
bd99dc85 PA |
4754 | For threads which we aren't explicitly told otherwise, we preserve |
4755 | the stepping flag; this is used for stepping over gdbserver-placed | |
4756 | breakpoints. | |
4757 | ||
4758 | If pending_flags was set in any thread, we queue any needed | |
4759 | signals, since we won't actually resume. We already have a pending | |
4760 | event to report, so we don't need to preserve any step requests; | |
4761 | they should be re-issued if necessary. */ | |
4762 | ||
4763 | static int | |
4764 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 4765 | { |
d86d4aaf DE |
4766 | struct thread_info *thread = (struct thread_info *) entry; |
4767 | struct lwp_info *lwp = get_thread_lwp (thread); | |
bd99dc85 | 4768 | int step; |
d50171e4 PA |
4769 | int leave_all_stopped = * (int *) arg; |
4770 | int leave_pending; | |
5544ad89 | 4771 | |
2bd7c093 | 4772 | if (lwp->resume == NULL) |
bd99dc85 | 4773 | return 0; |
5544ad89 | 4774 | |
bd99dc85 | 4775 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 4776 | { |
bd99dc85 | 4777 | if (debug_threads) |
d86d4aaf | 4778 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
4779 | |
4780 | if (!lwp->stopped) | |
4781 | { | |
4782 | if (debug_threads) | |
d86d4aaf | 4783 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 4784 | |
d50171e4 PA |
4785 | /* Stop the thread, and wait for the event asynchronously, |
4786 | through the event loop. */ | |
02fc4de7 | 4787 | send_sigstop (lwp); |
bd99dc85 PA |
4788 | } |
4789 | else | |
4790 | { | |
4791 | if (debug_threads) | |
87ce2a04 | 4792 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 4793 | lwpid_of (thread)); |
d50171e4 PA |
4794 | |
4795 | /* The LWP may have been stopped in an internal event that | |
4796 | was not meant to be notified back to GDB (e.g., gdbserver | |
4797 | breakpoint), so we should be reporting a stop event in | |
4798 | this case too. */ | |
4799 | ||
4800 | /* If the thread already has a pending SIGSTOP, this is a | |
4801 | no-op. Otherwise, something later will presumably resume | |
4802 | the thread and this will cause it to cancel any pending | |
4803 | operation, due to last_resume_kind == resume_stop. If | |
4804 | the thread already has a pending status to report, we | |
4805 | will still report it the next time we wait - see | |
4806 | status_pending_p_callback. */ | |
1a981360 PA |
4807 | |
4808 | /* If we already have a pending signal to report, then | |
4809 | there's no need to queue a SIGSTOP, as this means we're | |
4810 | midway through moving the LWP out of the jumppad, and we | |
4811 | will report the pending signal as soon as that is | |
4812 | finished. */ | |
4813 | if (lwp->pending_signals_to_report == NULL) | |
4814 | send_sigstop (lwp); | |
bd99dc85 | 4815 | } |
32ca6d61 | 4816 | |
bd99dc85 PA |
4817 | /* For stop requests, we're done. */ |
4818 | lwp->resume = NULL; | |
fc7238bb | 4819 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4820 | return 0; |
5544ad89 DJ |
4821 | } |
4822 | ||
bd99dc85 | 4823 | /* If this thread which is about to be resumed has a pending status, |
863d01bd PA |
4824 | then don't resume it - we can just report the pending status. |
4825 | Likewise if it is suspended, because e.g., another thread is | |
4826 | stepping past a breakpoint. Make sure to queue any signals that | |
4827 | would otherwise be sent. In all-stop mode, we do this decision | |
4828 | based on if *any* thread has a pending status. If there's a | |
4829 | thread that needs the step-over-breakpoint dance, then don't | |
4830 | resume any other thread but that particular one. */ | |
4831 | leave_pending = (lwp->suspended | |
4832 | || lwp->status_pending_p | |
4833 | || leave_all_stopped); | |
5544ad89 | 4834 | |
d50171e4 | 4835 | if (!leave_pending) |
bd99dc85 PA |
4836 | { |
4837 | if (debug_threads) | |
d86d4aaf | 4838 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 4839 | |
d50171e4 | 4840 | step = (lwp->resume->kind == resume_step); |
2acc282a | 4841 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
4842 | } |
4843 | else | |
4844 | { | |
4845 | if (debug_threads) | |
d86d4aaf | 4846 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
5544ad89 | 4847 | |
bd99dc85 PA |
4848 | /* If we have a new signal, enqueue the signal. */ |
4849 | if (lwp->resume->sig != 0) | |
4850 | { | |
8d749320 SM |
4851 | struct pending_signals *p_sig = XCNEW (struct pending_signals); |
4852 | ||
bd99dc85 PA |
4853 | p_sig->prev = lwp->pending_signals; |
4854 | p_sig->signal = lwp->resume->sig; | |
bd99dc85 PA |
4855 | |
4856 | /* If this is the same signal we were previously stopped by, | |
4857 | make sure to queue its siginfo. We can ignore the return | |
4858 | value of ptrace; if it fails, we'll skip | |
4859 | PTRACE_SETSIGINFO. */ | |
4860 | if (WIFSTOPPED (lwp->last_status) | |
4861 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
d86d4aaf | 4862 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4863 | &p_sig->info); |
bd99dc85 PA |
4864 | |
4865 | lwp->pending_signals = p_sig; | |
4866 | } | |
4867 | } | |
5544ad89 | 4868 | |
fc7238bb | 4869 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4870 | lwp->resume = NULL; |
5544ad89 | 4871 | return 0; |
0d62e5e8 DJ |
4872 | } |
4873 | ||
4874 | static void | |
2bd7c093 | 4875 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 4876 | { |
2bd7c093 | 4877 | struct thread_resume_array array = { resume_info, n }; |
d86d4aaf | 4878 | struct thread_info *need_step_over = NULL; |
d50171e4 PA |
4879 | int any_pending; |
4880 | int leave_all_stopped; | |
c6ecbae5 | 4881 | |
87ce2a04 DE |
4882 | if (debug_threads) |
4883 | { | |
4884 | debug_enter (); | |
4885 | debug_printf ("linux_resume:\n"); | |
4886 | } | |
4887 | ||
2bd7c093 | 4888 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 4889 | |
d50171e4 PA |
4890 | /* If there is a thread which would otherwise be resumed, which has |
4891 | a pending status, then don't resume any threads - we can just | |
4892 | report the pending status. Make sure to queue any signals that | |
4893 | would otherwise be sent. In non-stop mode, we'll apply this | |
4894 | logic to each thread individually. We consume all pending events | |
4895 | before considering to start a step-over (in all-stop). */ | |
4896 | any_pending = 0; | |
bd99dc85 | 4897 | if (!non_stop) |
d86d4aaf | 4898 | find_inferior (&all_threads, resume_status_pending_p, &any_pending); |
d50171e4 PA |
4899 | |
4900 | /* If there is a thread which would otherwise be resumed, which is | |
4901 | stopped at a breakpoint that needs stepping over, then don't | |
4902 | resume any threads - have it step over the breakpoint with all | |
4903 | other threads stopped, then resume all threads again. Make sure | |
4904 | to queue any signals that would otherwise be delivered or | |
4905 | queued. */ | |
4906 | if (!any_pending && supports_breakpoints ()) | |
4907 | need_step_over | |
d86d4aaf DE |
4908 | = (struct thread_info *) find_inferior (&all_threads, |
4909 | need_step_over_p, NULL); | |
d50171e4 PA |
4910 | |
4911 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
4912 | ||
4913 | if (debug_threads) | |
4914 | { | |
4915 | if (need_step_over != NULL) | |
87ce2a04 | 4916 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 4917 | else if (any_pending) |
87ce2a04 DE |
4918 | debug_printf ("Not resuming, all-stop and found " |
4919 | "an LWP with pending status\n"); | |
d50171e4 | 4920 | else |
87ce2a04 | 4921 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4922 | } |
4923 | ||
4924 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4925 | otherwise deliver. */ | |
4926 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
4927 | ||
4928 | if (need_step_over) | |
d86d4aaf | 4929 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4930 | |
4931 | if (debug_threads) | |
4932 | { | |
4933 | debug_printf ("linux_resume done\n"); | |
4934 | debug_exit (); | |
4935 | } | |
1bebeeca PA |
4936 | |
4937 | /* We may have events that were pending that can/should be sent to | |
4938 | the client now. Trigger a linux_wait call. */ | |
4939 | if (target_is_async_p ()) | |
4940 | async_file_mark (); | |
d50171e4 PA |
4941 | } |
4942 | ||
4943 | /* This function is called once per thread. We check the thread's | |
4944 | last resume request, which will tell us whether to resume, step, or | |
4945 | leave the thread stopped. Any signal the client requested to be | |
4946 | delivered has already been enqueued at this point. | |
4947 | ||
4948 | If any thread that GDB wants running is stopped at an internal | |
4949 | breakpoint that needs stepping over, we start a step-over operation | |
4950 | on that particular thread, and leave all others stopped. */ | |
4951 | ||
7984d532 PA |
4952 | static int |
4953 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 4954 | { |
d86d4aaf DE |
4955 | struct thread_info *thread = (struct thread_info *) entry; |
4956 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
4957 | int step; |
4958 | ||
7984d532 PA |
4959 | if (lwp == except) |
4960 | return 0; | |
d50171e4 PA |
4961 | |
4962 | if (debug_threads) | |
d86d4aaf | 4963 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4964 | |
4965 | if (!lwp->stopped) | |
4966 | { | |
4967 | if (debug_threads) | |
d86d4aaf | 4968 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
7984d532 | 4969 | return 0; |
d50171e4 PA |
4970 | } |
4971 | ||
02fc4de7 PA |
4972 | if (thread->last_resume_kind == resume_stop |
4973 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4974 | { |
4975 | if (debug_threads) | |
87ce2a04 | 4976 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4977 | lwpid_of (thread)); |
7984d532 | 4978 | return 0; |
d50171e4 PA |
4979 | } |
4980 | ||
4981 | if (lwp->status_pending_p) | |
4982 | { | |
4983 | if (debug_threads) | |
87ce2a04 | 4984 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4985 | lwpid_of (thread)); |
7984d532 | 4986 | return 0; |
d50171e4 PA |
4987 | } |
4988 | ||
7984d532 PA |
4989 | gdb_assert (lwp->suspended >= 0); |
4990 | ||
d50171e4 PA |
4991 | if (lwp->suspended) |
4992 | { | |
4993 | if (debug_threads) | |
d86d4aaf | 4994 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
7984d532 | 4995 | return 0; |
d50171e4 PA |
4996 | } |
4997 | ||
1a981360 PA |
4998 | if (thread->last_resume_kind == resume_stop |
4999 | && lwp->pending_signals_to_report == NULL | |
5000 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
5001 | { |
5002 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
5003 | last_status.kind check above would catch it, and we wouldn't | |
5004 | reach here. This LWP may have been momentarily paused by a | |
5005 | stop_all_lwps call while handling for example, another LWP's | |
5006 | step-over. In that case, the pending expected SIGSTOP signal | |
5007 | that was queued at vCont;t handling time will have already | |
5008 | been consumed by wait_for_sigstop, and so we need to requeue | |
5009 | another one here. Note that if the LWP already has a SIGSTOP | |
5010 | pending, this is a no-op. */ | |
5011 | ||
5012 | if (debug_threads) | |
87ce2a04 DE |
5013 | debug_printf ("Client wants LWP %ld to stop. " |
5014 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 5015 | lwpid_of (thread)); |
02fc4de7 PA |
5016 | |
5017 | send_sigstop (lwp); | |
5018 | } | |
5019 | ||
863d01bd PA |
5020 | if (thread->last_resume_kind == resume_step) |
5021 | { | |
5022 | if (debug_threads) | |
5023 | debug_printf (" stepping LWP %ld, client wants it stepping\n", | |
5024 | lwpid_of (thread)); | |
5025 | step = 1; | |
5026 | } | |
5027 | else if (lwp->bp_reinsert != 0) | |
5028 | { | |
5029 | if (debug_threads) | |
5030 | debug_printf (" stepping LWP %ld, reinsert set\n", | |
5031 | lwpid_of (thread)); | |
5032 | step = 1; | |
5033 | } | |
5034 | else | |
5035 | step = 0; | |
5036 | ||
d50171e4 | 5037 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
5038 | return 0; |
5039 | } | |
5040 | ||
5041 | static int | |
5042 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
5043 | { | |
d86d4aaf DE |
5044 | struct thread_info *thread = (struct thread_info *) entry; |
5045 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
5046 | |
5047 | if (lwp == except) | |
5048 | return 0; | |
5049 | ||
863d01bd | 5050 | lwp_suspended_decr (lwp); |
7984d532 PA |
5051 | |
5052 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
5053 | } |
5054 | ||
5055 | /* When we finish a step-over, set threads running again. If there's | |
5056 | another thread that may need a step-over, now's the time to start | |
5057 | it. Eventually, we'll move all threads past their breakpoints. */ | |
5058 | ||
5059 | static void | |
5060 | proceed_all_lwps (void) | |
5061 | { | |
d86d4aaf | 5062 | struct thread_info *need_step_over; |
d50171e4 PA |
5063 | |
5064 | /* If there is a thread which would otherwise be resumed, which is | |
5065 | stopped at a breakpoint that needs stepping over, then don't | |
5066 | resume any threads - have it step over the breakpoint with all | |
5067 | other threads stopped, then resume all threads again. */ | |
5068 | ||
5069 | if (supports_breakpoints ()) | |
5070 | { | |
5071 | need_step_over | |
d86d4aaf DE |
5072 | = (struct thread_info *) find_inferior (&all_threads, |
5073 | need_step_over_p, NULL); | |
d50171e4 PA |
5074 | |
5075 | if (need_step_over != NULL) | |
5076 | { | |
5077 | if (debug_threads) | |
87ce2a04 DE |
5078 | debug_printf ("proceed_all_lwps: found " |
5079 | "thread %ld needing a step-over\n", | |
5080 | lwpid_of (need_step_over)); | |
d50171e4 | 5081 | |
d86d4aaf | 5082 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
5083 | return; |
5084 | } | |
5085 | } | |
5544ad89 | 5086 | |
d50171e4 | 5087 | if (debug_threads) |
87ce2a04 | 5088 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 5089 | |
d86d4aaf | 5090 | find_inferior (&all_threads, proceed_one_lwp, NULL); |
d50171e4 PA |
5091 | } |
5092 | ||
5093 | /* Stopped LWPs that the client wanted to be running, that don't have | |
5094 | pending statuses, are set to run again, except for EXCEPT, if not | |
5095 | NULL. This undoes a stop_all_lwps call. */ | |
5096 | ||
5097 | static void | |
7984d532 | 5098 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 5099 | { |
5544ad89 DJ |
5100 | if (debug_threads) |
5101 | { | |
87ce2a04 | 5102 | debug_enter (); |
d50171e4 | 5103 | if (except) |
87ce2a04 | 5104 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 5105 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 5106 | else |
87ce2a04 | 5107 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
5108 | } |
5109 | ||
7984d532 | 5110 | if (unsuspend) |
d86d4aaf | 5111 | find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except); |
7984d532 | 5112 | else |
d86d4aaf | 5113 | find_inferior (&all_threads, proceed_one_lwp, except); |
87ce2a04 DE |
5114 | |
5115 | if (debug_threads) | |
5116 | { | |
5117 | debug_printf ("unstop_all_lwps done\n"); | |
5118 | debug_exit (); | |
5119 | } | |
0d62e5e8 DJ |
5120 | } |
5121 | ||
58caa3dc DJ |
5122 | |
5123 | #ifdef HAVE_LINUX_REGSETS | |
5124 | ||
1faeff08 MR |
5125 | #define use_linux_regsets 1 |
5126 | ||
030031ee PA |
5127 | /* Returns true if REGSET has been disabled. */ |
5128 | ||
5129 | static int | |
5130 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
5131 | { | |
5132 | return (info->disabled_regsets != NULL | |
5133 | && info->disabled_regsets[regset - info->regsets]); | |
5134 | } | |
5135 | ||
5136 | /* Disable REGSET. */ | |
5137 | ||
5138 | static void | |
5139 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
5140 | { | |
5141 | int dr_offset; | |
5142 | ||
5143 | dr_offset = regset - info->regsets; | |
5144 | if (info->disabled_regsets == NULL) | |
224c3ddb | 5145 | info->disabled_regsets = (char *) xcalloc (1, info->num_regsets); |
030031ee PA |
5146 | info->disabled_regsets[dr_offset] = 1; |
5147 | } | |
5148 | ||
58caa3dc | 5149 | static int |
3aee8918 PA |
5150 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
5151 | struct regcache *regcache) | |
58caa3dc DJ |
5152 | { |
5153 | struct regset_info *regset; | |
e9d25b98 | 5154 | int saw_general_regs = 0; |
95954743 | 5155 | int pid; |
1570b33e | 5156 | struct iovec iov; |
58caa3dc | 5157 | |
0bfdf32f | 5158 | pid = lwpid_of (current_thread); |
28eef672 | 5159 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5160 | { |
1570b33e L |
5161 | void *buf, *data; |
5162 | int nt_type, res; | |
58caa3dc | 5163 | |
030031ee | 5164 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 5165 | continue; |
58caa3dc | 5166 | |
bca929d3 | 5167 | buf = xmalloc (regset->size); |
1570b33e L |
5168 | |
5169 | nt_type = regset->nt_type; | |
5170 | if (nt_type) | |
5171 | { | |
5172 | iov.iov_base = buf; | |
5173 | iov.iov_len = regset->size; | |
5174 | data = (void *) &iov; | |
5175 | } | |
5176 | else | |
5177 | data = buf; | |
5178 | ||
dfb64f85 | 5179 | #ifndef __sparc__ |
f15f9948 | 5180 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5181 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5182 | #else |
1570b33e | 5183 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5184 | #endif |
58caa3dc DJ |
5185 | if (res < 0) |
5186 | { | |
5187 | if (errno == EIO) | |
5188 | { | |
52fa2412 | 5189 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 5190 | this process mode. */ |
030031ee | 5191 | disable_regset (regsets_info, regset); |
58caa3dc | 5192 | } |
e5a9158d AA |
5193 | else if (errno == ENODATA) |
5194 | { | |
5195 | /* ENODATA may be returned if the regset is currently | |
5196 | not "active". This can happen in normal operation, | |
5197 | so suppress the warning in this case. */ | |
5198 | } | |
58caa3dc DJ |
5199 | else |
5200 | { | |
0d62e5e8 | 5201 | char s[256]; |
95954743 PA |
5202 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
5203 | pid); | |
0d62e5e8 | 5204 | perror (s); |
58caa3dc DJ |
5205 | } |
5206 | } | |
098dbe61 AA |
5207 | else |
5208 | { | |
5209 | if (regset->type == GENERAL_REGS) | |
5210 | saw_general_regs = 1; | |
5211 | regset->store_function (regcache, buf); | |
5212 | } | |
fdeb2a12 | 5213 | free (buf); |
58caa3dc | 5214 | } |
e9d25b98 DJ |
5215 | if (saw_general_regs) |
5216 | return 0; | |
5217 | else | |
5218 | return 1; | |
58caa3dc DJ |
5219 | } |
5220 | ||
5221 | static int | |
3aee8918 PA |
5222 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
5223 | struct regcache *regcache) | |
58caa3dc DJ |
5224 | { |
5225 | struct regset_info *regset; | |
e9d25b98 | 5226 | int saw_general_regs = 0; |
95954743 | 5227 | int pid; |
1570b33e | 5228 | struct iovec iov; |
58caa3dc | 5229 | |
0bfdf32f | 5230 | pid = lwpid_of (current_thread); |
28eef672 | 5231 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5232 | { |
1570b33e L |
5233 | void *buf, *data; |
5234 | int nt_type, res; | |
58caa3dc | 5235 | |
feea5f36 AA |
5236 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
5237 | || regset->fill_function == NULL) | |
28eef672 | 5238 | continue; |
58caa3dc | 5239 | |
bca929d3 | 5240 | buf = xmalloc (regset->size); |
545587ee DJ |
5241 | |
5242 | /* First fill the buffer with the current register set contents, | |
5243 | in case there are any items in the kernel's regset that are | |
5244 | not in gdbserver's regcache. */ | |
1570b33e L |
5245 | |
5246 | nt_type = regset->nt_type; | |
5247 | if (nt_type) | |
5248 | { | |
5249 | iov.iov_base = buf; | |
5250 | iov.iov_len = regset->size; | |
5251 | data = (void *) &iov; | |
5252 | } | |
5253 | else | |
5254 | data = buf; | |
5255 | ||
dfb64f85 | 5256 | #ifndef __sparc__ |
f15f9948 | 5257 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5258 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5259 | #else |
689cc2ae | 5260 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5261 | #endif |
545587ee DJ |
5262 | |
5263 | if (res == 0) | |
5264 | { | |
5265 | /* Then overlay our cached registers on that. */ | |
442ea881 | 5266 | regset->fill_function (regcache, buf); |
545587ee DJ |
5267 | |
5268 | /* Only now do we write the register set. */ | |
dfb64f85 | 5269 | #ifndef __sparc__ |
f15f9948 | 5270 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 5271 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5272 | #else |
1570b33e | 5273 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 5274 | #endif |
545587ee DJ |
5275 | } |
5276 | ||
58caa3dc DJ |
5277 | if (res < 0) |
5278 | { | |
5279 | if (errno == EIO) | |
5280 | { | |
52fa2412 | 5281 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 5282 | this process mode. */ |
030031ee | 5283 | disable_regset (regsets_info, regset); |
58caa3dc | 5284 | } |
3221518c UW |
5285 | else if (errno == ESRCH) |
5286 | { | |
1b3f6016 PA |
5287 | /* At this point, ESRCH should mean the process is |
5288 | already gone, in which case we simply ignore attempts | |
5289 | to change its registers. See also the related | |
5290 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 5291 | free (buf); |
3221518c UW |
5292 | return 0; |
5293 | } | |
58caa3dc DJ |
5294 | else |
5295 | { | |
ce3a066d | 5296 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
5297 | } |
5298 | } | |
e9d25b98 DJ |
5299 | else if (regset->type == GENERAL_REGS) |
5300 | saw_general_regs = 1; | |
09ec9b38 | 5301 | free (buf); |
58caa3dc | 5302 | } |
e9d25b98 DJ |
5303 | if (saw_general_regs) |
5304 | return 0; | |
5305 | else | |
5306 | return 1; | |
58caa3dc DJ |
5307 | } |
5308 | ||
1faeff08 | 5309 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 5310 | |
1faeff08 | 5311 | #define use_linux_regsets 0 |
3aee8918 PA |
5312 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
5313 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 5314 | |
58caa3dc | 5315 | #endif |
1faeff08 MR |
5316 | |
5317 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
5318 | calls or 0 if it has to be transferred individually. */ | |
5319 | ||
5320 | static int | |
3aee8918 | 5321 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
5322 | { |
5323 | unsigned char mask = 1 << (regno % 8); | |
5324 | size_t index = regno / 8; | |
5325 | ||
5326 | return (use_linux_regsets | |
3aee8918 PA |
5327 | && (regs_info->regset_bitmap == NULL |
5328 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
5329 | } |
5330 | ||
58caa3dc | 5331 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 | 5332 | |
5b3da067 | 5333 | static int |
3aee8918 | 5334 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
5335 | { |
5336 | int addr; | |
5337 | ||
3aee8918 | 5338 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
5339 | error ("Invalid register number %d.", regnum); |
5340 | ||
3aee8918 | 5341 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
5342 | |
5343 | return addr; | |
5344 | } | |
5345 | ||
5346 | /* Fetch one register. */ | |
5347 | static void | |
3aee8918 PA |
5348 | fetch_register (const struct usrregs_info *usrregs, |
5349 | struct regcache *regcache, int regno) | |
1faeff08 MR |
5350 | { |
5351 | CORE_ADDR regaddr; | |
5352 | int i, size; | |
5353 | char *buf; | |
5354 | int pid; | |
5355 | ||
3aee8918 | 5356 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
5357 | return; |
5358 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
5359 | return; | |
5360 | ||
3aee8918 | 5361 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5362 | if (regaddr == -1) |
5363 | return; | |
5364 | ||
3aee8918 PA |
5365 | size = ((register_size (regcache->tdesc, regno) |
5366 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5367 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5368 | buf = (char *) alloca (size); |
1faeff08 | 5369 | |
0bfdf32f | 5370 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5371 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5372 | { | |
5373 | errno = 0; | |
5374 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
5375 | ptrace (PTRACE_PEEKUSER, pid, | |
5376 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5377 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5378 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
5379 | regaddr += sizeof (PTRACE_XFER_TYPE); |
5380 | if (errno != 0) | |
5381 | error ("reading register %d: %s", regno, strerror (errno)); | |
5382 | } | |
5383 | ||
5384 | if (the_low_target.supply_ptrace_register) | |
5385 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
5386 | else | |
5387 | supply_register (regcache, regno, buf); | |
5388 | } | |
5389 | ||
5390 | /* Store one register. */ | |
5391 | static void | |
3aee8918 PA |
5392 | store_register (const struct usrregs_info *usrregs, |
5393 | struct regcache *regcache, int regno) | |
1faeff08 MR |
5394 | { |
5395 | CORE_ADDR regaddr; | |
5396 | int i, size; | |
5397 | char *buf; | |
5398 | int pid; | |
5399 | ||
3aee8918 | 5400 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
5401 | return; |
5402 | if ((*the_low_target.cannot_store_register) (regno)) | |
5403 | return; | |
5404 | ||
3aee8918 | 5405 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5406 | if (regaddr == -1) |
5407 | return; | |
5408 | ||
3aee8918 PA |
5409 | size = ((register_size (regcache->tdesc, regno) |
5410 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5411 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5412 | buf = (char *) alloca (size); |
1faeff08 MR |
5413 | memset (buf, 0, size); |
5414 | ||
5415 | if (the_low_target.collect_ptrace_register) | |
5416 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
5417 | else | |
5418 | collect_register (regcache, regno, buf); | |
5419 | ||
0bfdf32f | 5420 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5421 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5422 | { | |
5423 | errno = 0; | |
5424 | ptrace (PTRACE_POKEUSER, pid, | |
5425 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5426 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5427 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
5428 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
5429 | if (errno != 0) |
5430 | { | |
5431 | /* At this point, ESRCH should mean the process is | |
5432 | already gone, in which case we simply ignore attempts | |
5433 | to change its registers. See also the related | |
5434 | comment in linux_resume_one_lwp. */ | |
5435 | if (errno == ESRCH) | |
5436 | return; | |
5437 | ||
5438 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
5439 | error ("writing register %d: %s", regno, strerror (errno)); | |
5440 | } | |
5441 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
5442 | } | |
5443 | } | |
5444 | ||
5445 | /* Fetch all registers, or just one, from the child process. | |
5446 | If REGNO is -1, do this for all registers, skipping any that are | |
5447 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
5448 | unless ALL is non-zero. | |
5449 | Otherwise, REGNO specifies which register (so we can save time). */ | |
5450 | static void | |
3aee8918 PA |
5451 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
5452 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 5453 | { |
3aee8918 PA |
5454 | struct usrregs_info *usr = regs_info->usrregs; |
5455 | ||
1faeff08 MR |
5456 | if (regno == -1) |
5457 | { | |
3aee8918 PA |
5458 | for (regno = 0; regno < usr->num_regs; regno++) |
5459 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5460 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
5461 | } |
5462 | else | |
3aee8918 | 5463 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
5464 | } |
5465 | ||
5466 | /* Store our register values back into the inferior. | |
5467 | If REGNO is -1, do this for all registers, skipping any that are | |
5468 | assumed to have been saved by regsets_store_inferior_registers, | |
5469 | unless ALL is non-zero. | |
5470 | Otherwise, REGNO specifies which register (so we can save time). */ | |
5471 | static void | |
3aee8918 PA |
5472 | usr_store_inferior_registers (const struct regs_info *regs_info, |
5473 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 5474 | { |
3aee8918 PA |
5475 | struct usrregs_info *usr = regs_info->usrregs; |
5476 | ||
1faeff08 MR |
5477 | if (regno == -1) |
5478 | { | |
3aee8918 PA |
5479 | for (regno = 0; regno < usr->num_regs; regno++) |
5480 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5481 | store_register (usr, regcache, regno); | |
1faeff08 MR |
5482 | } |
5483 | else | |
3aee8918 | 5484 | store_register (usr, regcache, regno); |
1faeff08 MR |
5485 | } |
5486 | ||
5487 | #else /* !HAVE_LINUX_USRREGS */ | |
5488 | ||
3aee8918 PA |
5489 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
5490 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 5491 | |
58caa3dc | 5492 | #endif |
1faeff08 MR |
5493 | |
5494 | ||
5b3da067 | 5495 | static void |
1faeff08 MR |
5496 | linux_fetch_registers (struct regcache *regcache, int regno) |
5497 | { | |
5498 | int use_regsets; | |
5499 | int all = 0; | |
3aee8918 | 5500 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5501 | |
5502 | if (regno == -1) | |
5503 | { | |
3aee8918 PA |
5504 | if (the_low_target.fetch_register != NULL |
5505 | && regs_info->usrregs != NULL) | |
5506 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
5507 | (*the_low_target.fetch_register) (regcache, regno); |
5508 | ||
3aee8918 PA |
5509 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5510 | if (regs_info->usrregs != NULL) | |
5511 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5512 | } |
5513 | else | |
5514 | { | |
c14dfd32 PA |
5515 | if (the_low_target.fetch_register != NULL |
5516 | && (*the_low_target.fetch_register) (regcache, regno)) | |
5517 | return; | |
5518 | ||
3aee8918 | 5519 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5520 | if (use_regsets) |
3aee8918 PA |
5521 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5522 | regcache); | |
5523 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5524 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5525 | } |
58caa3dc DJ |
5526 | } |
5527 | ||
5b3da067 | 5528 | static void |
442ea881 | 5529 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 5530 | { |
1faeff08 MR |
5531 | int use_regsets; |
5532 | int all = 0; | |
3aee8918 | 5533 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5534 | |
5535 | if (regno == -1) | |
5536 | { | |
3aee8918 PA |
5537 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5538 | regcache); | |
5539 | if (regs_info->usrregs != NULL) | |
5540 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5541 | } |
5542 | else | |
5543 | { | |
3aee8918 | 5544 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5545 | if (use_regsets) |
3aee8918 PA |
5546 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5547 | regcache); | |
5548 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5549 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5550 | } |
58caa3dc DJ |
5551 | } |
5552 | ||
da6d8c04 | 5553 | |
da6d8c04 DJ |
5554 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
5555 | to debugger memory starting at MYADDR. */ | |
5556 | ||
c3e735a6 | 5557 | static int |
f450004a | 5558 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 5559 | { |
0bfdf32f | 5560 | int pid = lwpid_of (current_thread); |
4934b29e MR |
5561 | register PTRACE_XFER_TYPE *buffer; |
5562 | register CORE_ADDR addr; | |
5563 | register int count; | |
5564 | char filename[64]; | |
da6d8c04 | 5565 | register int i; |
4934b29e | 5566 | int ret; |
fd462a61 | 5567 | int fd; |
fd462a61 DJ |
5568 | |
5569 | /* Try using /proc. Don't bother for one word. */ | |
5570 | if (len >= 3 * sizeof (long)) | |
5571 | { | |
4934b29e MR |
5572 | int bytes; |
5573 | ||
fd462a61 DJ |
5574 | /* We could keep this file open and cache it - possibly one per |
5575 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5576 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5577 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5578 | if (fd == -1) | |
5579 | goto no_proc; | |
5580 | ||
5581 | /* If pread64 is available, use it. It's faster if the kernel | |
5582 | supports it (only one syscall), and it's 64-bit safe even on | |
5583 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5584 | application). */ | |
5585 | #ifdef HAVE_PREAD64 | |
4934b29e | 5586 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5587 | #else |
4934b29e MR |
5588 | bytes = -1; |
5589 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5590 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5591 | #endif |
fd462a61 DJ |
5592 | |
5593 | close (fd); | |
4934b29e MR |
5594 | if (bytes == len) |
5595 | return 0; | |
5596 | ||
5597 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5598 | if (bytes > 0) | |
5599 | { | |
5600 | memaddr += bytes; | |
5601 | myaddr += bytes; | |
5602 | len -= bytes; | |
5603 | } | |
fd462a61 | 5604 | } |
da6d8c04 | 5605 | |
fd462a61 | 5606 | no_proc: |
4934b29e MR |
5607 | /* Round starting address down to longword boundary. */ |
5608 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5609 | /* Round ending address up; get number of longwords that makes. */ | |
5610 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5611 | / sizeof (PTRACE_XFER_TYPE)); | |
5612 | /* Allocate buffer of that many longwords. */ | |
8d749320 | 5613 | buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
4934b29e | 5614 | |
da6d8c04 | 5615 | /* Read all the longwords */ |
4934b29e | 5616 | errno = 0; |
da6d8c04 DJ |
5617 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5618 | { | |
14ce3065 DE |
5619 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5620 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5621 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5622 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5623 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5624 | if (errno) |
4934b29e | 5625 | break; |
da6d8c04 | 5626 | } |
4934b29e | 5627 | ret = errno; |
da6d8c04 DJ |
5628 | |
5629 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5630 | if (i > 0) |
5631 | { | |
5632 | i *= sizeof (PTRACE_XFER_TYPE); | |
5633 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5634 | memcpy (myaddr, | |
5635 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5636 | i < len ? i : len); | |
5637 | } | |
c3e735a6 | 5638 | |
4934b29e | 5639 | return ret; |
da6d8c04 DJ |
5640 | } |
5641 | ||
93ae6fdc PA |
5642 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5643 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5644 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5645 | |
ce3a066d | 5646 | static int |
f450004a | 5647 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
5648 | { |
5649 | register int i; | |
5650 | /* Round starting address down to longword boundary. */ | |
5651 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5652 | /* Round ending address up; get number of longwords that makes. */ | |
5653 | register int count | |
493e2a69 MS |
5654 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5655 | / sizeof (PTRACE_XFER_TYPE); | |
5656 | ||
da6d8c04 | 5657 | /* Allocate buffer of that many longwords. */ |
8d749320 | 5658 | register PTRACE_XFER_TYPE *buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
493e2a69 | 5659 | |
0bfdf32f | 5660 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5661 | |
f0ae6fc3 PA |
5662 | if (len == 0) |
5663 | { | |
5664 | /* Zero length write always succeeds. */ | |
5665 | return 0; | |
5666 | } | |
5667 | ||
0d62e5e8 DJ |
5668 | if (debug_threads) |
5669 | { | |
58d6951d | 5670 | /* Dump up to four bytes. */ |
bf47e248 PA |
5671 | char str[4 * 2 + 1]; |
5672 | char *p = str; | |
5673 | int dump = len < 4 ? len : 4; | |
5674 | ||
5675 | for (i = 0; i < dump; i++) | |
5676 | { | |
5677 | sprintf (p, "%02x", myaddr[i]); | |
5678 | p += 2; | |
5679 | } | |
5680 | *p = '\0'; | |
5681 | ||
5682 | debug_printf ("Writing %s to 0x%08lx in process %d\n", | |
5683 | str, (long) memaddr, pid); | |
0d62e5e8 DJ |
5684 | } |
5685 | ||
da6d8c04 DJ |
5686 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
5687 | ||
93ae6fdc | 5688 | errno = 0; |
14ce3065 DE |
5689 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5690 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5691 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5692 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5693 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
5694 | if (errno) |
5695 | return errno; | |
da6d8c04 DJ |
5696 | |
5697 | if (count > 1) | |
5698 | { | |
93ae6fdc | 5699 | errno = 0; |
da6d8c04 | 5700 | buffer[count - 1] |
95954743 | 5701 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
5702 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
5703 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5704 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 5705 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 5706 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
5707 | if (errno) |
5708 | return errno; | |
da6d8c04 DJ |
5709 | } |
5710 | ||
93ae6fdc | 5711 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 5712 | |
493e2a69 MS |
5713 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
5714 | myaddr, len); | |
da6d8c04 DJ |
5715 | |
5716 | /* Write the entire buffer. */ | |
5717 | ||
5718 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
5719 | { | |
5720 | errno = 0; | |
14ce3065 DE |
5721 | ptrace (PTRACE_POKETEXT, pid, |
5722 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5723 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5724 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5725 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
5726 | if (errno) |
5727 | return errno; | |
5728 | } | |
5729 | ||
5730 | return 0; | |
5731 | } | |
2f2893d9 DJ |
5732 | |
5733 | static void | |
5734 | linux_look_up_symbols (void) | |
5735 | { | |
0d62e5e8 | 5736 | #ifdef USE_THREAD_DB |
95954743 PA |
5737 | struct process_info *proc = current_process (); |
5738 | ||
fe978cb0 | 5739 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
5740 | return; |
5741 | ||
9b4c5f87 | 5742 | thread_db_init (); |
0d62e5e8 DJ |
5743 | #endif |
5744 | } | |
5745 | ||
e5379b03 | 5746 | static void |
ef57601b | 5747 | linux_request_interrupt (void) |
e5379b03 | 5748 | { |
a1928bad | 5749 | extern unsigned long signal_pid; |
e5379b03 | 5750 | |
78708b7c PA |
5751 | /* Send a SIGINT to the process group. This acts just like the user |
5752 | typed a ^C on the controlling terminal. */ | |
5753 | kill (-signal_pid, SIGINT); | |
e5379b03 DJ |
5754 | } |
5755 | ||
aa691b87 RM |
5756 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
5757 | to debugger memory starting at MYADDR. */ | |
5758 | ||
5759 | static int | |
f450004a | 5760 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
5761 | { |
5762 | char filename[PATH_MAX]; | |
5763 | int fd, n; | |
0bfdf32f | 5764 | int pid = lwpid_of (current_thread); |
aa691b87 | 5765 | |
6cebaf6e | 5766 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
5767 | |
5768 | fd = open (filename, O_RDONLY); | |
5769 | if (fd < 0) | |
5770 | return -1; | |
5771 | ||
5772 | if (offset != (CORE_ADDR) 0 | |
5773 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5774 | n = -1; | |
5775 | else | |
5776 | n = read (fd, myaddr, len); | |
5777 | ||
5778 | close (fd); | |
5779 | ||
5780 | return n; | |
5781 | } | |
5782 | ||
d993e290 PA |
5783 | /* These breakpoint and watchpoint related wrapper functions simply |
5784 | pass on the function call if the target has registered a | |
5785 | corresponding function. */ | |
e013ee27 OF |
5786 | |
5787 | static int | |
802e8e6d PA |
5788 | linux_supports_z_point_type (char z_type) |
5789 | { | |
5790 | return (the_low_target.supports_z_point_type != NULL | |
5791 | && the_low_target.supports_z_point_type (z_type)); | |
5792 | } | |
5793 | ||
5794 | static int | |
5795 | linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5796 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5797 | { |
c8f4bfdd YQ |
5798 | if (type == raw_bkpt_type_sw) |
5799 | return insert_memory_breakpoint (bp); | |
5800 | else if (the_low_target.insert_point != NULL) | |
802e8e6d | 5801 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
5802 | else |
5803 | /* Unsupported (see target.h). */ | |
5804 | return 1; | |
5805 | } | |
5806 | ||
5807 | static int | |
802e8e6d PA |
5808 | linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
5809 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5810 | { |
c8f4bfdd YQ |
5811 | if (type == raw_bkpt_type_sw) |
5812 | return remove_memory_breakpoint (bp); | |
5813 | else if (the_low_target.remove_point != NULL) | |
802e8e6d | 5814 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
5815 | else |
5816 | /* Unsupported (see target.h). */ | |
5817 | return 1; | |
5818 | } | |
5819 | ||
3e572f71 PA |
5820 | /* Implement the to_stopped_by_sw_breakpoint target_ops |
5821 | method. */ | |
5822 | ||
5823 | static int | |
5824 | linux_stopped_by_sw_breakpoint (void) | |
5825 | { | |
5826 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5827 | ||
5828 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
5829 | } | |
5830 | ||
5831 | /* Implement the to_supports_stopped_by_sw_breakpoint target_ops | |
5832 | method. */ | |
5833 | ||
5834 | static int | |
5835 | linux_supports_stopped_by_sw_breakpoint (void) | |
5836 | { | |
5837 | return USE_SIGTRAP_SIGINFO; | |
5838 | } | |
5839 | ||
5840 | /* Implement the to_stopped_by_hw_breakpoint target_ops | |
5841 | method. */ | |
5842 | ||
5843 | static int | |
5844 | linux_stopped_by_hw_breakpoint (void) | |
5845 | { | |
5846 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5847 | ||
5848 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
5849 | } | |
5850 | ||
5851 | /* Implement the to_supports_stopped_by_hw_breakpoint target_ops | |
5852 | method. */ | |
5853 | ||
5854 | static int | |
5855 | linux_supports_stopped_by_hw_breakpoint (void) | |
5856 | { | |
5857 | return USE_SIGTRAP_SIGINFO; | |
5858 | } | |
5859 | ||
70b90b91 | 5860 | /* Implement the supports_hardware_single_step target_ops method. */ |
45614f15 YQ |
5861 | |
5862 | static int | |
70b90b91 | 5863 | linux_supports_hardware_single_step (void) |
45614f15 | 5864 | { |
45614f15 YQ |
5865 | return can_hardware_single_step (); |
5866 | } | |
5867 | ||
7d00775e AT |
5868 | static int |
5869 | linux_supports_software_single_step (void) | |
5870 | { | |
5871 | return can_software_single_step (); | |
5872 | } | |
5873 | ||
e013ee27 OF |
5874 | static int |
5875 | linux_stopped_by_watchpoint (void) | |
5876 | { | |
0bfdf32f | 5877 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 5878 | |
15c66dd6 | 5879 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
5880 | } |
5881 | ||
5882 | static CORE_ADDR | |
5883 | linux_stopped_data_address (void) | |
5884 | { | |
0bfdf32f | 5885 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
5886 | |
5887 | return lwp->stopped_data_address; | |
e013ee27 OF |
5888 | } |
5889 | ||
db0dfaa0 LM |
5890 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
5891 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
5892 | && defined(PT_TEXT_END_ADDR) | |
5893 | ||
5894 | /* This is only used for targets that define PT_TEXT_ADDR, | |
5895 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
5896 | the target has different ways of acquiring this information, like | |
5897 | loadmaps. */ | |
52fb6437 NS |
5898 | |
5899 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
5900 | to tell gdb about. */ | |
5901 | ||
5902 | static int | |
5903 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
5904 | { | |
52fb6437 | 5905 | unsigned long text, text_end, data; |
62828379 | 5906 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
5907 | |
5908 | errno = 0; | |
5909 | ||
b8e1b30e LM |
5910 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
5911 | (PTRACE_TYPE_ARG4) 0); | |
5912 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
5913 | (PTRACE_TYPE_ARG4) 0); | |
5914 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
5915 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
5916 | |
5917 | if (errno == 0) | |
5918 | { | |
5919 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
5920 | used by gdb) are relative to the beginning of the program, |
5921 | with the data segment immediately following the text segment. | |
5922 | However, the actual runtime layout in memory may put the data | |
5923 | somewhere else, so when we send gdb a data base-address, we | |
5924 | use the real data base address and subtract the compile-time | |
5925 | data base-address from it (which is just the length of the | |
5926 | text segment). BSS immediately follows data in both | |
5927 | cases. */ | |
52fb6437 NS |
5928 | *text_p = text; |
5929 | *data_p = data - (text_end - text); | |
1b3f6016 | 5930 | |
52fb6437 NS |
5931 | return 1; |
5932 | } | |
52fb6437 NS |
5933 | return 0; |
5934 | } | |
5935 | #endif | |
5936 | ||
07e059b5 VP |
5937 | static int |
5938 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
5939 | unsigned char *readbuf, unsigned const char *writebuf, |
5940 | CORE_ADDR offset, int len) | |
07e059b5 | 5941 | { |
d26e3629 | 5942 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5943 | } |
5944 | ||
d0722149 DE |
5945 | /* Convert a native/host siginfo object, into/from the siginfo in the |
5946 | layout of the inferiors' architecture. */ | |
5947 | ||
5948 | static void | |
8adce034 | 5949 | siginfo_fixup (siginfo_t *siginfo, gdb_byte *inf_siginfo, int direction) |
d0722149 DE |
5950 | { |
5951 | int done = 0; | |
5952 | ||
5953 | if (the_low_target.siginfo_fixup != NULL) | |
5954 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
5955 | ||
5956 | /* If there was no callback, or the callback didn't do anything, | |
5957 | then just do a straight memcpy. */ | |
5958 | if (!done) | |
5959 | { | |
5960 | if (direction == 1) | |
a5362b9a | 5961 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 5962 | else |
a5362b9a | 5963 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
5964 | } |
5965 | } | |
5966 | ||
4aa995e1 PA |
5967 | static int |
5968 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
5969 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
5970 | { | |
d0722149 | 5971 | int pid; |
a5362b9a | 5972 | siginfo_t siginfo; |
8adce034 | 5973 | gdb_byte inf_siginfo[sizeof (siginfo_t)]; |
4aa995e1 | 5974 | |
0bfdf32f | 5975 | if (current_thread == NULL) |
4aa995e1 PA |
5976 | return -1; |
5977 | ||
0bfdf32f | 5978 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
5979 | |
5980 | if (debug_threads) | |
87ce2a04 DE |
5981 | debug_printf ("%s siginfo for lwp %d.\n", |
5982 | readbuf != NULL ? "Reading" : "Writing", | |
5983 | pid); | |
4aa995e1 | 5984 | |
0adea5f7 | 5985 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
5986 | return -1; |
5987 | ||
b8e1b30e | 5988 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5989 | return -1; |
5990 | ||
d0722149 DE |
5991 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
5992 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
5993 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
5994 | with a 32-bit GDBSERVER, we need to convert it. */ | |
5995 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
5996 | ||
4aa995e1 PA |
5997 | if (offset + len > sizeof (siginfo)) |
5998 | len = sizeof (siginfo) - offset; | |
5999 | ||
6000 | if (readbuf != NULL) | |
d0722149 | 6001 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
6002 | else |
6003 | { | |
d0722149 DE |
6004 | memcpy (inf_siginfo + offset, writebuf, len); |
6005 | ||
6006 | /* Convert back to ptrace layout before flushing it out. */ | |
6007 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
6008 | ||
b8e1b30e | 6009 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6010 | return -1; |
6011 | } | |
6012 | ||
6013 | return len; | |
6014 | } | |
6015 | ||
bd99dc85 PA |
6016 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
6017 | so we notice when children change state; as the handler for the | |
6018 | sigsuspend in my_waitpid. */ | |
6019 | ||
6020 | static void | |
6021 | sigchld_handler (int signo) | |
6022 | { | |
6023 | int old_errno = errno; | |
6024 | ||
6025 | if (debug_threads) | |
e581f2b4 PA |
6026 | { |
6027 | do | |
6028 | { | |
6029 | /* fprintf is not async-signal-safe, so call write | |
6030 | directly. */ | |
6031 | if (write (2, "sigchld_handler\n", | |
6032 | sizeof ("sigchld_handler\n") - 1) < 0) | |
6033 | break; /* just ignore */ | |
6034 | } while (0); | |
6035 | } | |
bd99dc85 PA |
6036 | |
6037 | if (target_is_async_p ()) | |
6038 | async_file_mark (); /* trigger a linux_wait */ | |
6039 | ||
6040 | errno = old_errno; | |
6041 | } | |
6042 | ||
6043 | static int | |
6044 | linux_supports_non_stop (void) | |
6045 | { | |
6046 | return 1; | |
6047 | } | |
6048 | ||
6049 | static int | |
6050 | linux_async (int enable) | |
6051 | { | |
7089dca4 | 6052 | int previous = target_is_async_p (); |
bd99dc85 | 6053 | |
8336d594 | 6054 | if (debug_threads) |
87ce2a04 DE |
6055 | debug_printf ("linux_async (%d), previous=%d\n", |
6056 | enable, previous); | |
8336d594 | 6057 | |
bd99dc85 PA |
6058 | if (previous != enable) |
6059 | { | |
6060 | sigset_t mask; | |
6061 | sigemptyset (&mask); | |
6062 | sigaddset (&mask, SIGCHLD); | |
6063 | ||
6064 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
6065 | ||
6066 | if (enable) | |
6067 | { | |
6068 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
6069 | { |
6070 | linux_event_pipe[0] = -1; | |
6071 | linux_event_pipe[1] = -1; | |
6072 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
6073 | ||
6074 | warning ("creating event pipe failed."); | |
6075 | return previous; | |
6076 | } | |
bd99dc85 PA |
6077 | |
6078 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
6079 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
6080 | ||
6081 | /* Register the event loop handler. */ | |
6082 | add_file_handler (linux_event_pipe[0], | |
6083 | handle_target_event, NULL); | |
6084 | ||
6085 | /* Always trigger a linux_wait. */ | |
6086 | async_file_mark (); | |
6087 | } | |
6088 | else | |
6089 | { | |
6090 | delete_file_handler (linux_event_pipe[0]); | |
6091 | ||
6092 | close (linux_event_pipe[0]); | |
6093 | close (linux_event_pipe[1]); | |
6094 | linux_event_pipe[0] = -1; | |
6095 | linux_event_pipe[1] = -1; | |
6096 | } | |
6097 | ||
6098 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
6099 | } | |
6100 | ||
6101 | return previous; | |
6102 | } | |
6103 | ||
6104 | static int | |
6105 | linux_start_non_stop (int nonstop) | |
6106 | { | |
6107 | /* Register or unregister from event-loop accordingly. */ | |
6108 | linux_async (nonstop); | |
aa96c426 GB |
6109 | |
6110 | if (target_is_async_p () != (nonstop != 0)) | |
6111 | return -1; | |
6112 | ||
bd99dc85 PA |
6113 | return 0; |
6114 | } | |
6115 | ||
cf8fd78b PA |
6116 | static int |
6117 | linux_supports_multi_process (void) | |
6118 | { | |
6119 | return 1; | |
6120 | } | |
6121 | ||
89245bc0 DB |
6122 | /* Check if fork events are supported. */ |
6123 | ||
6124 | static int | |
6125 | linux_supports_fork_events (void) | |
6126 | { | |
6127 | return linux_supports_tracefork (); | |
6128 | } | |
6129 | ||
6130 | /* Check if vfork events are supported. */ | |
6131 | ||
6132 | static int | |
6133 | linux_supports_vfork_events (void) | |
6134 | { | |
6135 | return linux_supports_tracefork (); | |
6136 | } | |
6137 | ||
94585166 DB |
6138 | /* Check if exec events are supported. */ |
6139 | ||
6140 | static int | |
6141 | linux_supports_exec_events (void) | |
6142 | { | |
6143 | return linux_supports_traceexec (); | |
6144 | } | |
6145 | ||
de0d863e DB |
6146 | /* Callback for 'find_inferior'. Set the (possibly changed) ptrace |
6147 | options for the specified lwp. */ | |
6148 | ||
6149 | static int | |
6150 | reset_lwp_ptrace_options_callback (struct inferior_list_entry *entry, | |
6151 | void *args) | |
6152 | { | |
6153 | struct thread_info *thread = (struct thread_info *) entry; | |
6154 | struct lwp_info *lwp = get_thread_lwp (thread); | |
6155 | ||
6156 | if (!lwp->stopped) | |
6157 | { | |
6158 | /* Stop the lwp so we can modify its ptrace options. */ | |
6159 | lwp->must_set_ptrace_flags = 1; | |
6160 | linux_stop_lwp (lwp); | |
6161 | } | |
6162 | else | |
6163 | { | |
6164 | /* Already stopped; go ahead and set the ptrace options. */ | |
6165 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
6166 | int options = linux_low_ptrace_options (proc->attached); | |
6167 | ||
6168 | linux_enable_event_reporting (lwpid_of (thread), options); | |
6169 | lwp->must_set_ptrace_flags = 0; | |
6170 | } | |
6171 | ||
6172 | return 0; | |
6173 | } | |
6174 | ||
6175 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the | |
6176 | ptrace flags for all inferiors. This is in case the new GDB connection | |
6177 | doesn't support the same set of events that the previous one did. */ | |
6178 | ||
6179 | static void | |
6180 | linux_handle_new_gdb_connection (void) | |
6181 | { | |
6182 | pid_t pid; | |
6183 | ||
6184 | /* Request that all the lwps reset their ptrace options. */ | |
6185 | find_inferior (&all_threads, reset_lwp_ptrace_options_callback , &pid); | |
6186 | } | |
6187 | ||
03583c20 UW |
6188 | static int |
6189 | linux_supports_disable_randomization (void) | |
6190 | { | |
6191 | #ifdef HAVE_PERSONALITY | |
6192 | return 1; | |
6193 | #else | |
6194 | return 0; | |
6195 | #endif | |
6196 | } | |
efcbbd14 | 6197 | |
d1feda86 YQ |
6198 | static int |
6199 | linux_supports_agent (void) | |
6200 | { | |
6201 | return 1; | |
6202 | } | |
6203 | ||
c2d6af84 PA |
6204 | static int |
6205 | linux_supports_range_stepping (void) | |
6206 | { | |
6207 | if (*the_low_target.supports_range_stepping == NULL) | |
6208 | return 0; | |
6209 | ||
6210 | return (*the_low_target.supports_range_stepping) (); | |
6211 | } | |
6212 | ||
efcbbd14 UW |
6213 | /* Enumerate spufs IDs for process PID. */ |
6214 | static int | |
6215 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
6216 | { | |
6217 | int pos = 0; | |
6218 | int written = 0; | |
6219 | char path[128]; | |
6220 | DIR *dir; | |
6221 | struct dirent *entry; | |
6222 | ||
6223 | sprintf (path, "/proc/%ld/fd", pid); | |
6224 | dir = opendir (path); | |
6225 | if (!dir) | |
6226 | return -1; | |
6227 | ||
6228 | rewinddir (dir); | |
6229 | while ((entry = readdir (dir)) != NULL) | |
6230 | { | |
6231 | struct stat st; | |
6232 | struct statfs stfs; | |
6233 | int fd; | |
6234 | ||
6235 | fd = atoi (entry->d_name); | |
6236 | if (!fd) | |
6237 | continue; | |
6238 | ||
6239 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
6240 | if (stat (path, &st) != 0) | |
6241 | continue; | |
6242 | if (!S_ISDIR (st.st_mode)) | |
6243 | continue; | |
6244 | ||
6245 | if (statfs (path, &stfs) != 0) | |
6246 | continue; | |
6247 | if (stfs.f_type != SPUFS_MAGIC) | |
6248 | continue; | |
6249 | ||
6250 | if (pos >= offset && pos + 4 <= offset + len) | |
6251 | { | |
6252 | *(unsigned int *)(buf + pos - offset) = fd; | |
6253 | written += 4; | |
6254 | } | |
6255 | pos += 4; | |
6256 | } | |
6257 | ||
6258 | closedir (dir); | |
6259 | return written; | |
6260 | } | |
6261 | ||
6262 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
6263 | object type, using the /proc file system. */ | |
6264 | static int | |
6265 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
6266 | unsigned const char *writebuf, | |
6267 | CORE_ADDR offset, int len) | |
6268 | { | |
0bfdf32f | 6269 | long pid = lwpid_of (current_thread); |
efcbbd14 UW |
6270 | char buf[128]; |
6271 | int fd = 0; | |
6272 | int ret = 0; | |
6273 | ||
6274 | if (!writebuf && !readbuf) | |
6275 | return -1; | |
6276 | ||
6277 | if (!*annex) | |
6278 | { | |
6279 | if (!readbuf) | |
6280 | return -1; | |
6281 | else | |
6282 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
6283 | } | |
6284 | ||
6285 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
6286 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
6287 | if (fd <= 0) | |
6288 | return -1; | |
6289 | ||
6290 | if (offset != 0 | |
6291 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
6292 | { | |
6293 | close (fd); | |
6294 | return 0; | |
6295 | } | |
6296 | ||
6297 | if (writebuf) | |
6298 | ret = write (fd, writebuf, (size_t) len); | |
6299 | else | |
6300 | ret = read (fd, readbuf, (size_t) len); | |
6301 | ||
6302 | close (fd); | |
6303 | return ret; | |
6304 | } | |
6305 | ||
723b724b | 6306 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
6307 | struct target_loadseg |
6308 | { | |
6309 | /* Core address to which the segment is mapped. */ | |
6310 | Elf32_Addr addr; | |
6311 | /* VMA recorded in the program header. */ | |
6312 | Elf32_Addr p_vaddr; | |
6313 | /* Size of this segment in memory. */ | |
6314 | Elf32_Word p_memsz; | |
6315 | }; | |
6316 | ||
723b724b | 6317 | # if defined PT_GETDSBT |
78d85199 YQ |
6318 | struct target_loadmap |
6319 | { | |
6320 | /* Protocol version number, must be zero. */ | |
6321 | Elf32_Word version; | |
6322 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
6323 | unsigned *dsbt_table; | |
6324 | unsigned dsbt_size, dsbt_index; | |
6325 | /* Number of segments in this map. */ | |
6326 | Elf32_Word nsegs; | |
6327 | /* The actual memory map. */ | |
6328 | struct target_loadseg segs[/*nsegs*/]; | |
6329 | }; | |
723b724b MF |
6330 | # define LINUX_LOADMAP PT_GETDSBT |
6331 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
6332 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
6333 | # else | |
6334 | struct target_loadmap | |
6335 | { | |
6336 | /* Protocol version number, must be zero. */ | |
6337 | Elf32_Half version; | |
6338 | /* Number of segments in this map. */ | |
6339 | Elf32_Half nsegs; | |
6340 | /* The actual memory map. */ | |
6341 | struct target_loadseg segs[/*nsegs*/]; | |
6342 | }; | |
6343 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
6344 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
6345 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
6346 | # endif | |
78d85199 | 6347 | |
78d85199 YQ |
6348 | static int |
6349 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
6350 | unsigned char *myaddr, unsigned int len) | |
6351 | { | |
0bfdf32f | 6352 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
6353 | int addr = -1; |
6354 | struct target_loadmap *data = NULL; | |
6355 | unsigned int actual_length, copy_length; | |
6356 | ||
6357 | if (strcmp (annex, "exec") == 0) | |
723b724b | 6358 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 6359 | else if (strcmp (annex, "interp") == 0) |
723b724b | 6360 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
6361 | else |
6362 | return -1; | |
6363 | ||
723b724b | 6364 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
6365 | return -1; |
6366 | ||
6367 | if (data == NULL) | |
6368 | return -1; | |
6369 | ||
6370 | actual_length = sizeof (struct target_loadmap) | |
6371 | + sizeof (struct target_loadseg) * data->nsegs; | |
6372 | ||
6373 | if (offset < 0 || offset > actual_length) | |
6374 | return -1; | |
6375 | ||
6376 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
6377 | memcpy (myaddr, (char *) data + offset, copy_length); | |
6378 | return copy_length; | |
6379 | } | |
723b724b MF |
6380 | #else |
6381 | # define linux_read_loadmap NULL | |
6382 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 6383 | |
1570b33e | 6384 | static void |
06e03fff | 6385 | linux_process_qsupported (char **features, int count) |
1570b33e L |
6386 | { |
6387 | if (the_low_target.process_qsupported != NULL) | |
06e03fff | 6388 | the_low_target.process_qsupported (features, count); |
1570b33e L |
6389 | } |
6390 | ||
82075af2 JS |
6391 | static int |
6392 | linux_supports_catch_syscall (void) | |
6393 | { | |
6394 | return (the_low_target.get_syscall_trapinfo != NULL | |
6395 | && linux_supports_tracesysgood ()); | |
6396 | } | |
6397 | ||
ae91f625 MK |
6398 | static int |
6399 | linux_get_ipa_tdesc_idx (void) | |
6400 | { | |
6401 | if (the_low_target.get_ipa_tdesc_idx == NULL) | |
6402 | return 0; | |
6403 | ||
6404 | return (*the_low_target.get_ipa_tdesc_idx) (); | |
6405 | } | |
6406 | ||
219f2f23 PA |
6407 | static int |
6408 | linux_supports_tracepoints (void) | |
6409 | { | |
6410 | if (*the_low_target.supports_tracepoints == NULL) | |
6411 | return 0; | |
6412 | ||
6413 | return (*the_low_target.supports_tracepoints) (); | |
6414 | } | |
6415 | ||
6416 | static CORE_ADDR | |
6417 | linux_read_pc (struct regcache *regcache) | |
6418 | { | |
6419 | if (the_low_target.get_pc == NULL) | |
6420 | return 0; | |
6421 | ||
6422 | return (*the_low_target.get_pc) (regcache); | |
6423 | } | |
6424 | ||
6425 | static void | |
6426 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
6427 | { | |
6428 | gdb_assert (the_low_target.set_pc != NULL); | |
6429 | ||
6430 | (*the_low_target.set_pc) (regcache, pc); | |
6431 | } | |
6432 | ||
8336d594 PA |
6433 | static int |
6434 | linux_thread_stopped (struct thread_info *thread) | |
6435 | { | |
6436 | return get_thread_lwp (thread)->stopped; | |
6437 | } | |
6438 | ||
6439 | /* This exposes stop-all-threads functionality to other modules. */ | |
6440 | ||
6441 | static void | |
7984d532 | 6442 | linux_pause_all (int freeze) |
8336d594 | 6443 | { |
7984d532 PA |
6444 | stop_all_lwps (freeze, NULL); |
6445 | } | |
6446 | ||
6447 | /* This exposes unstop-all-threads functionality to other gdbserver | |
6448 | modules. */ | |
6449 | ||
6450 | static void | |
6451 | linux_unpause_all (int unfreeze) | |
6452 | { | |
6453 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
6454 | } |
6455 | ||
90d74c30 PA |
6456 | static int |
6457 | linux_prepare_to_access_memory (void) | |
6458 | { | |
6459 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6460 | running LWP. */ | |
6461 | if (non_stop) | |
6462 | linux_pause_all (1); | |
6463 | return 0; | |
6464 | } | |
6465 | ||
6466 | static void | |
0146f85b | 6467 | linux_done_accessing_memory (void) |
90d74c30 PA |
6468 | { |
6469 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6470 | running LWP. */ | |
6471 | if (non_stop) | |
6472 | linux_unpause_all (1); | |
6473 | } | |
6474 | ||
fa593d66 PA |
6475 | static int |
6476 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
6477 | CORE_ADDR collector, | |
6478 | CORE_ADDR lockaddr, | |
6479 | ULONGEST orig_size, | |
6480 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
6481 | CORE_ADDR *trampoline, |
6482 | ULONGEST *trampoline_size, | |
fa593d66 PA |
6483 | unsigned char *jjump_pad_insn, |
6484 | ULONGEST *jjump_pad_insn_size, | |
6485 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
6486 | CORE_ADDR *adjusted_insn_addr_end, |
6487 | char *err) | |
fa593d66 PA |
6488 | { |
6489 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
6490 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
6491 | jump_entry, trampoline, trampoline_size, |
6492 | jjump_pad_insn, jjump_pad_insn_size, | |
6493 | adjusted_insn_addr, adjusted_insn_addr_end, | |
6494 | err); | |
fa593d66 PA |
6495 | } |
6496 | ||
6a271cae PA |
6497 | static struct emit_ops * |
6498 | linux_emit_ops (void) | |
6499 | { | |
6500 | if (the_low_target.emit_ops != NULL) | |
6501 | return (*the_low_target.emit_ops) (); | |
6502 | else | |
6503 | return NULL; | |
6504 | } | |
6505 | ||
405f8e94 SS |
6506 | static int |
6507 | linux_get_min_fast_tracepoint_insn_len (void) | |
6508 | { | |
6509 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
6510 | } | |
6511 | ||
2268b414 JK |
6512 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
6513 | ||
6514 | static int | |
6515 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
6516 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
6517 | { | |
6518 | char filename[PATH_MAX]; | |
6519 | int fd; | |
6520 | const int auxv_size = is_elf64 | |
6521 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
6522 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
6523 | ||
6524 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
6525 | ||
6526 | fd = open (filename, O_RDONLY); | |
6527 | if (fd < 0) | |
6528 | return 1; | |
6529 | ||
6530 | *phdr_memaddr = 0; | |
6531 | *num_phdr = 0; | |
6532 | while (read (fd, buf, auxv_size) == auxv_size | |
6533 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6534 | { | |
6535 | if (is_elf64) | |
6536 | { | |
6537 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6538 | ||
6539 | switch (aux->a_type) | |
6540 | { | |
6541 | case AT_PHDR: | |
6542 | *phdr_memaddr = aux->a_un.a_val; | |
6543 | break; | |
6544 | case AT_PHNUM: | |
6545 | *num_phdr = aux->a_un.a_val; | |
6546 | break; | |
6547 | } | |
6548 | } | |
6549 | else | |
6550 | { | |
6551 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6552 | ||
6553 | switch (aux->a_type) | |
6554 | { | |
6555 | case AT_PHDR: | |
6556 | *phdr_memaddr = aux->a_un.a_val; | |
6557 | break; | |
6558 | case AT_PHNUM: | |
6559 | *num_phdr = aux->a_un.a_val; | |
6560 | break; | |
6561 | } | |
6562 | } | |
6563 | } | |
6564 | ||
6565 | close (fd); | |
6566 | ||
6567 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6568 | { | |
6569 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6570 | "phdr_memaddr = %ld, phdr_num = %d", | |
6571 | (long) *phdr_memaddr, *num_phdr); | |
6572 | return 2; | |
6573 | } | |
6574 | ||
6575 | return 0; | |
6576 | } | |
6577 | ||
6578 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6579 | ||
6580 | static CORE_ADDR | |
6581 | get_dynamic (const int pid, const int is_elf64) | |
6582 | { | |
6583 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6584 | int num_phdr, i; |
2268b414 | 6585 | unsigned char *phdr_buf; |
db1ff28b | 6586 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6587 | |
6588 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6589 | return 0; | |
6590 | ||
6591 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
224c3ddb | 6592 | phdr_buf = (unsigned char *) alloca (num_phdr * phdr_size); |
2268b414 JK |
6593 | |
6594 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6595 | return 0; | |
6596 | ||
6597 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6598 | non-zero for PIE ones. */ | |
6599 | relocation = -1; | |
db1ff28b JK |
6600 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6601 | if (is_elf64) | |
6602 | { | |
6603 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6604 | ||
6605 | if (p->p_type == PT_PHDR) | |
6606 | relocation = phdr_memaddr - p->p_vaddr; | |
6607 | } | |
6608 | else | |
6609 | { | |
6610 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6611 | ||
6612 | if (p->p_type == PT_PHDR) | |
6613 | relocation = phdr_memaddr - p->p_vaddr; | |
6614 | } | |
6615 | ||
2268b414 JK |
6616 | if (relocation == -1) |
6617 | { | |
e237a7e2 JK |
6618 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6619 | any real world executables, including PIE executables, have always | |
6620 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6621 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6622 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6623 | ||
6624 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6625 | ||
6626 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6627 | ||
2268b414 JK |
6628 | return 0; |
6629 | } | |
6630 | ||
db1ff28b JK |
6631 | for (i = 0; i < num_phdr; i++) |
6632 | { | |
6633 | if (is_elf64) | |
6634 | { | |
6635 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6636 | ||
6637 | if (p->p_type == PT_DYNAMIC) | |
6638 | return p->p_vaddr + relocation; | |
6639 | } | |
6640 | else | |
6641 | { | |
6642 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6643 | |
db1ff28b JK |
6644 | if (p->p_type == PT_DYNAMIC) |
6645 | return p->p_vaddr + relocation; | |
6646 | } | |
6647 | } | |
2268b414 JK |
6648 | |
6649 | return 0; | |
6650 | } | |
6651 | ||
6652 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6653 | can be 0 if the inferior does not yet have the library list initialized. |
6654 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6655 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6656 | |
6657 | static CORE_ADDR | |
6658 | get_r_debug (const int pid, const int is_elf64) | |
6659 | { | |
6660 | CORE_ADDR dynamic_memaddr; | |
6661 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6662 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6663 | CORE_ADDR map = -1; |
2268b414 JK |
6664 | |
6665 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6666 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6667 | return map; |
2268b414 JK |
6668 | |
6669 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6670 | { | |
6671 | if (is_elf64) | |
6672 | { | |
6673 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
a738da3a | 6674 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6675 | union |
6676 | { | |
6677 | Elf64_Xword map; | |
6678 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6679 | } | |
6680 | rld_map; | |
a738da3a MF |
6681 | #endif |
6682 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6683 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6684 | { | |
6685 | if (linux_read_memory (dyn->d_un.d_val, | |
6686 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6687 | return rld_map.map; | |
6688 | else | |
6689 | break; | |
6690 | } | |
75f62ce7 | 6691 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6692 | #ifdef DT_MIPS_RLD_MAP_REL |
6693 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6694 | { | |
6695 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6696 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6697 | return rld_map.map; | |
6698 | else | |
6699 | break; | |
6700 | } | |
6701 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6702 | |
367ba2c2 MR |
6703 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6704 | map = dyn->d_un.d_val; | |
2268b414 JK |
6705 | |
6706 | if (dyn->d_tag == DT_NULL) | |
6707 | break; | |
6708 | } | |
6709 | else | |
6710 | { | |
6711 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
a738da3a | 6712 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6713 | union |
6714 | { | |
6715 | Elf32_Word map; | |
6716 | unsigned char buf[sizeof (Elf32_Word)]; | |
6717 | } | |
6718 | rld_map; | |
a738da3a MF |
6719 | #endif |
6720 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6721 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6722 | { | |
6723 | if (linux_read_memory (dyn->d_un.d_val, | |
6724 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6725 | return rld_map.map; | |
6726 | else | |
6727 | break; | |
6728 | } | |
75f62ce7 | 6729 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6730 | #ifdef DT_MIPS_RLD_MAP_REL |
6731 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6732 | { | |
6733 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6734 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6735 | return rld_map.map; | |
6736 | else | |
6737 | break; | |
6738 | } | |
6739 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6740 | |
367ba2c2 MR |
6741 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6742 | map = dyn->d_un.d_val; | |
2268b414 JK |
6743 | |
6744 | if (dyn->d_tag == DT_NULL) | |
6745 | break; | |
6746 | } | |
6747 | ||
6748 | dynamic_memaddr += dyn_size; | |
6749 | } | |
6750 | ||
367ba2c2 | 6751 | return map; |
2268b414 JK |
6752 | } |
6753 | ||
6754 | /* Read one pointer from MEMADDR in the inferior. */ | |
6755 | ||
6756 | static int | |
6757 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
6758 | { | |
485f1ee4 PA |
6759 | int ret; |
6760 | ||
6761 | /* Go through a union so this works on either big or little endian | |
6762 | hosts, when the inferior's pointer size is smaller than the size | |
6763 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
6764 | same of the superior's. */ | |
6765 | union | |
6766 | { | |
6767 | CORE_ADDR core_addr; | |
6768 | unsigned int ui; | |
6769 | unsigned char uc; | |
6770 | } addr; | |
6771 | ||
6772 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
6773 | if (ret == 0) | |
6774 | { | |
6775 | if (ptr_size == sizeof (CORE_ADDR)) | |
6776 | *ptr = addr.core_addr; | |
6777 | else if (ptr_size == sizeof (unsigned int)) | |
6778 | *ptr = addr.ui; | |
6779 | else | |
6780 | gdb_assert_not_reached ("unhandled pointer size"); | |
6781 | } | |
6782 | return ret; | |
2268b414 JK |
6783 | } |
6784 | ||
6785 | struct link_map_offsets | |
6786 | { | |
6787 | /* Offset and size of r_debug.r_version. */ | |
6788 | int r_version_offset; | |
6789 | ||
6790 | /* Offset and size of r_debug.r_map. */ | |
6791 | int r_map_offset; | |
6792 | ||
6793 | /* Offset to l_addr field in struct link_map. */ | |
6794 | int l_addr_offset; | |
6795 | ||
6796 | /* Offset to l_name field in struct link_map. */ | |
6797 | int l_name_offset; | |
6798 | ||
6799 | /* Offset to l_ld field in struct link_map. */ | |
6800 | int l_ld_offset; | |
6801 | ||
6802 | /* Offset to l_next field in struct link_map. */ | |
6803 | int l_next_offset; | |
6804 | ||
6805 | /* Offset to l_prev field in struct link_map. */ | |
6806 | int l_prev_offset; | |
6807 | }; | |
6808 | ||
fb723180 | 6809 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
6810 | |
6811 | static int | |
6812 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
6813 | unsigned const char *writebuf, | |
6814 | CORE_ADDR offset, int len) | |
6815 | { | |
6816 | char *document; | |
6817 | unsigned document_len; | |
fe978cb0 | 6818 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
6819 | char filename[PATH_MAX]; |
6820 | int pid, is_elf64; | |
6821 | ||
6822 | static const struct link_map_offsets lmo_32bit_offsets = | |
6823 | { | |
6824 | 0, /* r_version offset. */ | |
6825 | 4, /* r_debug.r_map offset. */ | |
6826 | 0, /* l_addr offset in link_map. */ | |
6827 | 4, /* l_name offset in link_map. */ | |
6828 | 8, /* l_ld offset in link_map. */ | |
6829 | 12, /* l_next offset in link_map. */ | |
6830 | 16 /* l_prev offset in link_map. */ | |
6831 | }; | |
6832 | ||
6833 | static const struct link_map_offsets lmo_64bit_offsets = | |
6834 | { | |
6835 | 0, /* r_version offset. */ | |
6836 | 8, /* r_debug.r_map offset. */ | |
6837 | 0, /* l_addr offset in link_map. */ | |
6838 | 8, /* l_name offset in link_map. */ | |
6839 | 16, /* l_ld offset in link_map. */ | |
6840 | 24, /* l_next offset in link_map. */ | |
6841 | 32 /* l_prev offset in link_map. */ | |
6842 | }; | |
6843 | const struct link_map_offsets *lmo; | |
214d508e | 6844 | unsigned int machine; |
b1fbec62 GB |
6845 | int ptr_size; |
6846 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
6847 | int allocated = 1024; | |
6848 | char *p; | |
6849 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
6850 | int header_done = 0; | |
2268b414 JK |
6851 | |
6852 | if (writebuf != NULL) | |
6853 | return -2; | |
6854 | if (readbuf == NULL) | |
6855 | return -1; | |
6856 | ||
0bfdf32f | 6857 | pid = lwpid_of (current_thread); |
2268b414 | 6858 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 6859 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 6860 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 6861 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 6862 | |
b1fbec62 GB |
6863 | while (annex[0] != '\0') |
6864 | { | |
6865 | const char *sep; | |
6866 | CORE_ADDR *addrp; | |
6867 | int len; | |
2268b414 | 6868 | |
b1fbec62 GB |
6869 | sep = strchr (annex, '='); |
6870 | if (sep == NULL) | |
6871 | break; | |
0c5bf5a9 | 6872 | |
b1fbec62 | 6873 | len = sep - annex; |
61012eef | 6874 | if (len == 5 && startswith (annex, "start")) |
b1fbec62 | 6875 | addrp = &lm_addr; |
61012eef | 6876 | else if (len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
6877 | addrp = &lm_prev; |
6878 | else | |
6879 | { | |
6880 | annex = strchr (sep, ';'); | |
6881 | if (annex == NULL) | |
6882 | break; | |
6883 | annex++; | |
6884 | continue; | |
6885 | } | |
6886 | ||
6887 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 6888 | } |
b1fbec62 GB |
6889 | |
6890 | if (lm_addr == 0) | |
2268b414 | 6891 | { |
b1fbec62 GB |
6892 | int r_version = 0; |
6893 | ||
6894 | if (priv->r_debug == 0) | |
6895 | priv->r_debug = get_r_debug (pid, is_elf64); | |
6896 | ||
6897 | /* We failed to find DT_DEBUG. Such situation will not change | |
6898 | for this inferior - do not retry it. Report it to GDB as | |
6899 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
6900 | if (priv->r_debug == (CORE_ADDR) -1) | |
6901 | return -1; | |
6902 | ||
6903 | if (priv->r_debug != 0) | |
2268b414 | 6904 | { |
b1fbec62 GB |
6905 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
6906 | (unsigned char *) &r_version, | |
6907 | sizeof (r_version)) != 0 | |
6908 | || r_version != 1) | |
6909 | { | |
6910 | warning ("unexpected r_debug version %d", r_version); | |
6911 | } | |
6912 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
6913 | &lm_addr, ptr_size) != 0) | |
6914 | { | |
6915 | warning ("unable to read r_map from 0x%lx", | |
6916 | (long) priv->r_debug + lmo->r_map_offset); | |
6917 | } | |
2268b414 | 6918 | } |
b1fbec62 | 6919 | } |
2268b414 | 6920 | |
224c3ddb | 6921 | document = (char *) xmalloc (allocated); |
b1fbec62 GB |
6922 | strcpy (document, "<library-list-svr4 version=\"1.0\""); |
6923 | p = document + strlen (document); | |
6924 | ||
6925 | while (lm_addr | |
6926 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
6927 | &l_name, ptr_size) == 0 | |
6928 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
6929 | &l_addr, ptr_size) == 0 | |
6930 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
6931 | &l_ld, ptr_size) == 0 | |
6932 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
6933 | &l_prev, ptr_size) == 0 | |
6934 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
6935 | &l_next, ptr_size) == 0) | |
6936 | { | |
6937 | unsigned char libname[PATH_MAX]; | |
6938 | ||
6939 | if (lm_prev != l_prev) | |
2268b414 | 6940 | { |
b1fbec62 GB |
6941 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
6942 | (long) lm_prev, (long) l_prev); | |
6943 | break; | |
2268b414 JK |
6944 | } |
6945 | ||
d878444c JK |
6946 | /* Ignore the first entry even if it has valid name as the first entry |
6947 | corresponds to the main executable. The first entry should not be | |
6948 | skipped if the dynamic loader was loaded late by a static executable | |
6949 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
6950 | executable does not have PT_DYNAMIC present and this function already | |
6951 | exited above due to failed get_r_debug. */ | |
6952 | if (lm_prev == 0) | |
2268b414 | 6953 | { |
d878444c JK |
6954 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
6955 | p = p + strlen (p); | |
6956 | } | |
6957 | else | |
6958 | { | |
6959 | /* Not checking for error because reading may stop before | |
6960 | we've got PATH_MAX worth of characters. */ | |
6961 | libname[0] = '\0'; | |
6962 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
6963 | libname[sizeof (libname) - 1] = '\0'; | |
6964 | if (libname[0] != '\0') | |
2268b414 | 6965 | { |
d878444c JK |
6966 | /* 6x the size for xml_escape_text below. */ |
6967 | size_t len = 6 * strlen ((char *) libname); | |
6968 | char *name; | |
2268b414 | 6969 | |
d878444c JK |
6970 | if (!header_done) |
6971 | { | |
6972 | /* Terminate `<library-list-svr4'. */ | |
6973 | *p++ = '>'; | |
6974 | header_done = 1; | |
6975 | } | |
2268b414 | 6976 | |
db1ff28b | 6977 | while (allocated < p - document + len + 200) |
d878444c JK |
6978 | { |
6979 | /* Expand to guarantee sufficient storage. */ | |
6980 | uintptr_t document_len = p - document; | |
2268b414 | 6981 | |
224c3ddb | 6982 | document = (char *) xrealloc (document, 2 * allocated); |
d878444c JK |
6983 | allocated *= 2; |
6984 | p = document + document_len; | |
6985 | } | |
6986 | ||
6987 | name = xml_escape_text ((char *) libname); | |
6988 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
db1ff28b | 6989 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", |
d878444c JK |
6990 | name, (unsigned long) lm_addr, |
6991 | (unsigned long) l_addr, (unsigned long) l_ld); | |
6992 | free (name); | |
6993 | } | |
0afae3cf | 6994 | } |
b1fbec62 GB |
6995 | |
6996 | lm_prev = lm_addr; | |
6997 | lm_addr = l_next; | |
2268b414 JK |
6998 | } |
6999 | ||
b1fbec62 GB |
7000 | if (!header_done) |
7001 | { | |
7002 | /* Empty list; terminate `<library-list-svr4'. */ | |
7003 | strcpy (p, "/>"); | |
7004 | } | |
7005 | else | |
7006 | strcpy (p, "</library-list-svr4>"); | |
7007 | ||
2268b414 JK |
7008 | document_len = strlen (document); |
7009 | if (offset < document_len) | |
7010 | document_len -= offset; | |
7011 | else | |
7012 | document_len = 0; | |
7013 | if (len > document_len) | |
7014 | len = document_len; | |
7015 | ||
7016 | memcpy (readbuf, document + offset, len); | |
7017 | xfree (document); | |
7018 | ||
7019 | return len; | |
7020 | } | |
7021 | ||
9accd112 MM |
7022 | #ifdef HAVE_LINUX_BTRACE |
7023 | ||
969c39fb | 7024 | /* See to_disable_btrace target method. */ |
9accd112 | 7025 | |
969c39fb MM |
7026 | static int |
7027 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
7028 | { | |
7029 | enum btrace_error err; | |
7030 | ||
7031 | err = linux_disable_btrace (tinfo); | |
7032 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
7033 | } | |
7034 | ||
bc504a31 | 7035 | /* Encode an Intel Processor Trace configuration. */ |
b20a6524 MM |
7036 | |
7037 | static void | |
7038 | linux_low_encode_pt_config (struct buffer *buffer, | |
7039 | const struct btrace_data_pt_config *config) | |
7040 | { | |
7041 | buffer_grow_str (buffer, "<pt-config>\n"); | |
7042 | ||
7043 | switch (config->cpu.vendor) | |
7044 | { | |
7045 | case CV_INTEL: | |
7046 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
7047 | "model=\"%u\" stepping=\"%u\"/>\n", | |
7048 | config->cpu.family, config->cpu.model, | |
7049 | config->cpu.stepping); | |
7050 | break; | |
7051 | ||
7052 | default: | |
7053 | break; | |
7054 | } | |
7055 | ||
7056 | buffer_grow_str (buffer, "</pt-config>\n"); | |
7057 | } | |
7058 | ||
7059 | /* Encode a raw buffer. */ | |
7060 | ||
7061 | static void | |
7062 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
7063 | unsigned int size) | |
7064 | { | |
7065 | if (size == 0) | |
7066 | return; | |
7067 | ||
7068 | /* We use hex encoding - see common/rsp-low.h. */ | |
7069 | buffer_grow_str (buffer, "<raw>\n"); | |
7070 | ||
7071 | while (size-- > 0) | |
7072 | { | |
7073 | char elem[2]; | |
7074 | ||
7075 | elem[0] = tohex ((*data >> 4) & 0xf); | |
7076 | elem[1] = tohex (*data++ & 0xf); | |
7077 | ||
7078 | buffer_grow (buffer, elem, 2); | |
7079 | } | |
7080 | ||
7081 | buffer_grow_str (buffer, "</raw>\n"); | |
7082 | } | |
7083 | ||
969c39fb MM |
7084 | /* See to_read_btrace target method. */ |
7085 | ||
7086 | static int | |
9accd112 | 7087 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
add67df8 | 7088 | enum btrace_read_type type) |
9accd112 | 7089 | { |
734b0e4b | 7090 | struct btrace_data btrace; |
9accd112 | 7091 | struct btrace_block *block; |
969c39fb | 7092 | enum btrace_error err; |
9accd112 MM |
7093 | int i; |
7094 | ||
734b0e4b MM |
7095 | btrace_data_init (&btrace); |
7096 | ||
969c39fb MM |
7097 | err = linux_read_btrace (&btrace, tinfo, type); |
7098 | if (err != BTRACE_ERR_NONE) | |
7099 | { | |
7100 | if (err == BTRACE_ERR_OVERFLOW) | |
7101 | buffer_grow_str0 (buffer, "E.Overflow."); | |
7102 | else | |
7103 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
7104 | ||
b20a6524 | 7105 | goto err; |
969c39fb | 7106 | } |
9accd112 | 7107 | |
734b0e4b MM |
7108 | switch (btrace.format) |
7109 | { | |
7110 | case BTRACE_FORMAT_NONE: | |
7111 | buffer_grow_str0 (buffer, "E.No Trace."); | |
b20a6524 | 7112 | goto err; |
734b0e4b MM |
7113 | |
7114 | case BTRACE_FORMAT_BTS: | |
7115 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7116 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 7117 | |
734b0e4b MM |
7118 | for (i = 0; |
7119 | VEC_iterate (btrace_block_s, btrace.variant.bts.blocks, i, block); | |
7120 | i++) | |
7121 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
7122 | paddress (block->begin), paddress (block->end)); | |
9accd112 | 7123 | |
734b0e4b MM |
7124 | buffer_grow_str0 (buffer, "</btrace>\n"); |
7125 | break; | |
7126 | ||
b20a6524 MM |
7127 | case BTRACE_FORMAT_PT: |
7128 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7129 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
7130 | buffer_grow_str (buffer, "<pt>\n"); | |
7131 | ||
7132 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 7133 | |
b20a6524 MM |
7134 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
7135 | btrace.variant.pt.size); | |
7136 | ||
7137 | buffer_grow_str (buffer, "</pt>\n"); | |
7138 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
7139 | break; | |
7140 | ||
7141 | default: | |
7142 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
7143 | goto err; | |
734b0e4b | 7144 | } |
969c39fb | 7145 | |
734b0e4b | 7146 | btrace_data_fini (&btrace); |
969c39fb | 7147 | return 0; |
b20a6524 MM |
7148 | |
7149 | err: | |
7150 | btrace_data_fini (&btrace); | |
7151 | return -1; | |
9accd112 | 7152 | } |
f4abbc16 MM |
7153 | |
7154 | /* See to_btrace_conf target method. */ | |
7155 | ||
7156 | static int | |
7157 | linux_low_btrace_conf (const struct btrace_target_info *tinfo, | |
7158 | struct buffer *buffer) | |
7159 | { | |
7160 | const struct btrace_config *conf; | |
7161 | ||
7162 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
7163 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
7164 | ||
7165 | conf = linux_btrace_conf (tinfo); | |
7166 | if (conf != NULL) | |
7167 | { | |
7168 | switch (conf->format) | |
7169 | { | |
7170 | case BTRACE_FORMAT_NONE: | |
7171 | break; | |
7172 | ||
7173 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
7174 | buffer_xml_printf (buffer, "<bts"); |
7175 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
7176 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 7177 | break; |
b20a6524 MM |
7178 | |
7179 | case BTRACE_FORMAT_PT: | |
7180 | buffer_xml_printf (buffer, "<pt"); | |
7181 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
7182 | buffer_xml_printf (buffer, "/>\n"); | |
7183 | break; | |
f4abbc16 MM |
7184 | } |
7185 | } | |
7186 | ||
7187 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
7188 | return 0; | |
7189 | } | |
9accd112 MM |
7190 | #endif /* HAVE_LINUX_BTRACE */ |
7191 | ||
7b669087 GB |
7192 | /* See nat/linux-nat.h. */ |
7193 | ||
7194 | ptid_t | |
7195 | current_lwp_ptid (void) | |
7196 | { | |
7197 | return ptid_of (current_thread); | |
7198 | } | |
7199 | ||
dd373349 AT |
7200 | /* Implementation of the target_ops method "breakpoint_kind_from_pc". */ |
7201 | ||
7202 | static int | |
7203 | linux_breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
7204 | { | |
7205 | if (the_low_target.breakpoint_kind_from_pc != NULL) | |
7206 | return (*the_low_target.breakpoint_kind_from_pc) (pcptr); | |
7207 | else | |
1652a986 | 7208 | return default_breakpoint_kind_from_pc (pcptr); |
dd373349 AT |
7209 | } |
7210 | ||
7211 | /* Implementation of the target_ops method "sw_breakpoint_from_kind". */ | |
7212 | ||
7213 | static const gdb_byte * | |
7214 | linux_sw_breakpoint_from_kind (int kind, int *size) | |
7215 | { | |
7216 | gdb_assert (the_low_target.sw_breakpoint_from_kind != NULL); | |
7217 | ||
7218 | return (*the_low_target.sw_breakpoint_from_kind) (kind, size); | |
7219 | } | |
7220 | ||
769ef81f AT |
7221 | /* Implementation of the target_ops method |
7222 | "breakpoint_kind_from_current_state". */ | |
7223 | ||
7224 | static int | |
7225 | linux_breakpoint_kind_from_current_state (CORE_ADDR *pcptr) | |
7226 | { | |
7227 | if (the_low_target.breakpoint_kind_from_current_state != NULL) | |
7228 | return (*the_low_target.breakpoint_kind_from_current_state) (pcptr); | |
7229 | else | |
7230 | return linux_breakpoint_kind_from_pc (pcptr); | |
7231 | } | |
7232 | ||
276d4552 YQ |
7233 | /* Default implementation of linux_target_ops method "set_pc" for |
7234 | 32-bit pc register which is literally named "pc". */ | |
7235 | ||
7236 | void | |
7237 | linux_set_pc_32bit (struct regcache *regcache, CORE_ADDR pc) | |
7238 | { | |
7239 | uint32_t newpc = pc; | |
7240 | ||
7241 | supply_register_by_name (regcache, "pc", &newpc); | |
7242 | } | |
7243 | ||
7244 | /* Default implementation of linux_target_ops method "get_pc" for | |
7245 | 32-bit pc register which is literally named "pc". */ | |
7246 | ||
7247 | CORE_ADDR | |
7248 | linux_get_pc_32bit (struct regcache *regcache) | |
7249 | { | |
7250 | uint32_t pc; | |
7251 | ||
7252 | collect_register_by_name (regcache, "pc", &pc); | |
7253 | if (debug_threads) | |
7254 | debug_printf ("stop pc is 0x%" PRIx32 "\n", pc); | |
7255 | return pc; | |
7256 | } | |
7257 | ||
6f69e520 YQ |
7258 | /* Default implementation of linux_target_ops method "set_pc" for |
7259 | 64-bit pc register which is literally named "pc". */ | |
7260 | ||
7261 | void | |
7262 | linux_set_pc_64bit (struct regcache *regcache, CORE_ADDR pc) | |
7263 | { | |
7264 | uint64_t newpc = pc; | |
7265 | ||
7266 | supply_register_by_name (regcache, "pc", &newpc); | |
7267 | } | |
7268 | ||
7269 | /* Default implementation of linux_target_ops method "get_pc" for | |
7270 | 64-bit pc register which is literally named "pc". */ | |
7271 | ||
7272 | CORE_ADDR | |
7273 | linux_get_pc_64bit (struct regcache *regcache) | |
7274 | { | |
7275 | uint64_t pc; | |
7276 | ||
7277 | collect_register_by_name (regcache, "pc", &pc); | |
7278 | if (debug_threads) | |
7279 | debug_printf ("stop pc is 0x%" PRIx64 "\n", pc); | |
7280 | return pc; | |
7281 | } | |
7282 | ||
7283 | ||
ce3a066d DJ |
7284 | static struct target_ops linux_target_ops = { |
7285 | linux_create_inferior, | |
ece66d65 | 7286 | linux_post_create_inferior, |
ce3a066d DJ |
7287 | linux_attach, |
7288 | linux_kill, | |
6ad8ae5c | 7289 | linux_detach, |
8336d594 | 7290 | linux_mourn, |
444d6139 | 7291 | linux_join, |
ce3a066d DJ |
7292 | linux_thread_alive, |
7293 | linux_resume, | |
7294 | linux_wait, | |
7295 | linux_fetch_registers, | |
7296 | linux_store_registers, | |
90d74c30 | 7297 | linux_prepare_to_access_memory, |
0146f85b | 7298 | linux_done_accessing_memory, |
ce3a066d DJ |
7299 | linux_read_memory, |
7300 | linux_write_memory, | |
2f2893d9 | 7301 | linux_look_up_symbols, |
ef57601b | 7302 | linux_request_interrupt, |
aa691b87 | 7303 | linux_read_auxv, |
802e8e6d | 7304 | linux_supports_z_point_type, |
d993e290 PA |
7305 | linux_insert_point, |
7306 | linux_remove_point, | |
3e572f71 PA |
7307 | linux_stopped_by_sw_breakpoint, |
7308 | linux_supports_stopped_by_sw_breakpoint, | |
7309 | linux_stopped_by_hw_breakpoint, | |
7310 | linux_supports_stopped_by_hw_breakpoint, | |
70b90b91 | 7311 | linux_supports_hardware_single_step, |
e013ee27 OF |
7312 | linux_stopped_by_watchpoint, |
7313 | linux_stopped_data_address, | |
db0dfaa0 LM |
7314 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
7315 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
7316 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 7317 | linux_read_offsets, |
dae5f5cf DJ |
7318 | #else |
7319 | NULL, | |
7320 | #endif | |
7321 | #ifdef USE_THREAD_DB | |
7322 | thread_db_get_tls_address, | |
7323 | #else | |
7324 | NULL, | |
52fb6437 | 7325 | #endif |
efcbbd14 | 7326 | linux_qxfer_spu, |
59a016f0 | 7327 | hostio_last_error_from_errno, |
07e059b5 | 7328 | linux_qxfer_osdata, |
4aa995e1 | 7329 | linux_xfer_siginfo, |
bd99dc85 PA |
7330 | linux_supports_non_stop, |
7331 | linux_async, | |
7332 | linux_start_non_stop, | |
cdbfd419 | 7333 | linux_supports_multi_process, |
89245bc0 DB |
7334 | linux_supports_fork_events, |
7335 | linux_supports_vfork_events, | |
94585166 | 7336 | linux_supports_exec_events, |
de0d863e | 7337 | linux_handle_new_gdb_connection, |
cdbfd419 | 7338 | #ifdef USE_THREAD_DB |
dc146f7c | 7339 | thread_db_handle_monitor_command, |
cdbfd419 | 7340 | #else |
dc146f7c | 7341 | NULL, |
cdbfd419 | 7342 | #endif |
d26e3629 | 7343 | linux_common_core_of_thread, |
78d85199 | 7344 | linux_read_loadmap, |
219f2f23 PA |
7345 | linux_process_qsupported, |
7346 | linux_supports_tracepoints, | |
7347 | linux_read_pc, | |
8336d594 PA |
7348 | linux_write_pc, |
7349 | linux_thread_stopped, | |
7984d532 | 7350 | NULL, |
711e434b | 7351 | linux_pause_all, |
7984d532 | 7352 | linux_unpause_all, |
fa593d66 | 7353 | linux_stabilize_threads, |
6a271cae | 7354 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
7355 | linux_emit_ops, |
7356 | linux_supports_disable_randomization, | |
405f8e94 | 7357 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 7358 | linux_qxfer_libraries_svr4, |
d1feda86 | 7359 | linux_supports_agent, |
9accd112 MM |
7360 | #ifdef HAVE_LINUX_BTRACE |
7361 | linux_supports_btrace, | |
0568462b | 7362 | linux_enable_btrace, |
969c39fb | 7363 | linux_low_disable_btrace, |
9accd112 | 7364 | linux_low_read_btrace, |
f4abbc16 | 7365 | linux_low_btrace_conf, |
9accd112 MM |
7366 | #else |
7367 | NULL, | |
7368 | NULL, | |
7369 | NULL, | |
7370 | NULL, | |
f4abbc16 | 7371 | NULL, |
9accd112 | 7372 | #endif |
c2d6af84 | 7373 | linux_supports_range_stepping, |
e57f1de3 | 7374 | linux_proc_pid_to_exec_file, |
14d2069a GB |
7375 | linux_mntns_open_cloexec, |
7376 | linux_mntns_unlink, | |
7377 | linux_mntns_readlink, | |
dd373349 | 7378 | linux_breakpoint_kind_from_pc, |
79efa585 SM |
7379 | linux_sw_breakpoint_from_kind, |
7380 | linux_proc_tid_get_name, | |
7d00775e | 7381 | linux_breakpoint_kind_from_current_state, |
82075af2 JS |
7382 | linux_supports_software_single_step, |
7383 | linux_supports_catch_syscall, | |
ae91f625 | 7384 | linux_get_ipa_tdesc_idx, |
ce3a066d DJ |
7385 | }; |
7386 | ||
3aee8918 PA |
7387 | #ifdef HAVE_LINUX_REGSETS |
7388 | void | |
7389 | initialize_regsets_info (struct regsets_info *info) | |
7390 | { | |
7391 | for (info->num_regsets = 0; | |
7392 | info->regsets[info->num_regsets].size >= 0; | |
7393 | info->num_regsets++) | |
7394 | ; | |
3aee8918 PA |
7395 | } |
7396 | #endif | |
7397 | ||
da6d8c04 DJ |
7398 | void |
7399 | initialize_low (void) | |
7400 | { | |
bd99dc85 | 7401 | struct sigaction sigchld_action; |
dd373349 | 7402 | |
bd99dc85 | 7403 | memset (&sigchld_action, 0, sizeof (sigchld_action)); |
ce3a066d | 7404 | set_target_ops (&linux_target_ops); |
dd373349 | 7405 | |
aa7c7447 | 7406 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
7407 | |
7408 | sigchld_action.sa_handler = sigchld_handler; | |
7409 | sigemptyset (&sigchld_action.sa_mask); | |
7410 | sigchld_action.sa_flags = SA_RESTART; | |
7411 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
7412 | |
7413 | initialize_low_arch (); | |
89245bc0 DB |
7414 | |
7415 | linux_check_ptrace_features (); | |
da6d8c04 | 7416 | } |