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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" |
957f3f49 DE |
49 | #ifndef ELFMAG0 |
50 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
51 | then ELFMAG0 will have been defined. If it didn't get included by | |
52 | gdb_proc_service.h then including it will likely introduce a duplicate | |
53 | definition of elf_fpregset_t. */ | |
54 | #include <elf.h> | |
55 | #endif | |
14d2069a | 56 | #include "nat/linux-namespaces.h" |
efcbbd14 UW |
57 | |
58 | #ifndef SPUFS_MAGIC | |
59 | #define SPUFS_MAGIC 0x23c9b64e | |
60 | #endif | |
da6d8c04 | 61 | |
03583c20 UW |
62 | #ifdef HAVE_PERSONALITY |
63 | # include <sys/personality.h> | |
64 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
65 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
66 | # endif | |
67 | #endif | |
68 | ||
fd462a61 DJ |
69 | #ifndef O_LARGEFILE |
70 | #define O_LARGEFILE 0 | |
71 | #endif | |
1a981360 | 72 | |
db0dfaa0 LM |
73 | /* Some targets did not define these ptrace constants from the start, |
74 | so gdbserver defines them locally here. In the future, these may | |
75 | be removed after they are added to asm/ptrace.h. */ | |
76 | #if !(defined(PT_TEXT_ADDR) \ | |
77 | || defined(PT_DATA_ADDR) \ | |
78 | || defined(PT_TEXT_END_ADDR)) | |
79 | #if defined(__mcoldfire__) | |
80 | /* These are still undefined in 3.10 kernels. */ | |
81 | #define PT_TEXT_ADDR 49*4 | |
82 | #define PT_DATA_ADDR 50*4 | |
83 | #define PT_TEXT_END_ADDR 51*4 | |
84 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
85 | #elif defined(BFIN) | |
86 | #define PT_TEXT_ADDR 220 | |
87 | #define PT_TEXT_END_ADDR 224 | |
88 | #define PT_DATA_ADDR 228 | |
89 | /* These are still undefined in 3.10 kernels. */ | |
90 | #elif defined(__TMS320C6X__) | |
91 | #define PT_TEXT_ADDR (0x10000*4) | |
92 | #define PT_DATA_ADDR (0x10004*4) | |
93 | #define PT_TEXT_END_ADDR (0x10008*4) | |
94 | #endif | |
95 | #endif | |
96 | ||
9accd112 | 97 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 98 | # include "nat/linux-btrace.h" |
734b0e4b | 99 | # include "btrace-common.h" |
9accd112 MM |
100 | #endif |
101 | ||
8365dcf5 TJB |
102 | #ifndef HAVE_ELF32_AUXV_T |
103 | /* Copied from glibc's elf.h. */ | |
104 | typedef struct | |
105 | { | |
106 | uint32_t a_type; /* Entry type */ | |
107 | union | |
108 | { | |
109 | uint32_t a_val; /* Integer value */ | |
110 | /* We use to have pointer elements added here. We cannot do that, | |
111 | though, since it does not work when using 32-bit definitions | |
112 | on 64-bit platforms and vice versa. */ | |
113 | } a_un; | |
114 | } Elf32_auxv_t; | |
115 | #endif | |
116 | ||
117 | #ifndef HAVE_ELF64_AUXV_T | |
118 | /* Copied from glibc's elf.h. */ | |
119 | typedef struct | |
120 | { | |
121 | uint64_t a_type; /* Entry type */ | |
122 | union | |
123 | { | |
124 | uint64_t a_val; /* Integer value */ | |
125 | /* We use to have pointer elements added here. We cannot do that, | |
126 | though, since it does not work when using 32-bit definitions | |
127 | on 64-bit platforms and vice versa. */ | |
128 | } a_un; | |
129 | } Elf64_auxv_t; | |
130 | #endif | |
131 | ||
ded48a5e YQ |
132 | /* Does the current host support PTRACE_GETREGSET? */ |
133 | int have_ptrace_getregset = -1; | |
134 | ||
cff068da GB |
135 | /* LWP accessors. */ |
136 | ||
137 | /* See nat/linux-nat.h. */ | |
138 | ||
139 | ptid_t | |
140 | ptid_of_lwp (struct lwp_info *lwp) | |
141 | { | |
142 | return ptid_of (get_lwp_thread (lwp)); | |
143 | } | |
144 | ||
145 | /* See nat/linux-nat.h. */ | |
146 | ||
4b134ca1 GB |
147 | void |
148 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
149 | struct arch_lwp_info *info) | |
150 | { | |
151 | lwp->arch_private = info; | |
152 | } | |
153 | ||
154 | /* See nat/linux-nat.h. */ | |
155 | ||
156 | struct arch_lwp_info * | |
157 | lwp_arch_private_info (struct lwp_info *lwp) | |
158 | { | |
159 | return lwp->arch_private; | |
160 | } | |
161 | ||
162 | /* See nat/linux-nat.h. */ | |
163 | ||
cff068da GB |
164 | int |
165 | lwp_is_stopped (struct lwp_info *lwp) | |
166 | { | |
167 | return lwp->stopped; | |
168 | } | |
169 | ||
170 | /* See nat/linux-nat.h. */ | |
171 | ||
172 | enum target_stop_reason | |
173 | lwp_stop_reason (struct lwp_info *lwp) | |
174 | { | |
175 | return lwp->stop_reason; | |
176 | } | |
177 | ||
05044653 PA |
178 | /* A list of all unknown processes which receive stop signals. Some |
179 | other process will presumably claim each of these as forked | |
180 | children momentarily. */ | |
24a09b5f | 181 | |
05044653 PA |
182 | struct simple_pid_list |
183 | { | |
184 | /* The process ID. */ | |
185 | int pid; | |
186 | ||
187 | /* The status as reported by waitpid. */ | |
188 | int status; | |
189 | ||
190 | /* Next in chain. */ | |
191 | struct simple_pid_list *next; | |
192 | }; | |
193 | struct simple_pid_list *stopped_pids; | |
194 | ||
195 | /* Trivial list manipulation functions to keep track of a list of new | |
196 | stopped processes. */ | |
197 | ||
198 | static void | |
199 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
200 | { | |
8d749320 | 201 | struct simple_pid_list *new_pid = XNEW (struct simple_pid_list); |
05044653 PA |
202 | |
203 | new_pid->pid = pid; | |
204 | new_pid->status = status; | |
205 | new_pid->next = *listp; | |
206 | *listp = new_pid; | |
207 | } | |
208 | ||
209 | static int | |
210 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
211 | { | |
212 | struct simple_pid_list **p; | |
213 | ||
214 | for (p = listp; *p != NULL; p = &(*p)->next) | |
215 | if ((*p)->pid == pid) | |
216 | { | |
217 | struct simple_pid_list *next = (*p)->next; | |
218 | ||
219 | *statusp = (*p)->status; | |
220 | xfree (*p); | |
221 | *p = next; | |
222 | return 1; | |
223 | } | |
224 | return 0; | |
225 | } | |
24a09b5f | 226 | |
bde24c0a PA |
227 | enum stopping_threads_kind |
228 | { | |
229 | /* Not stopping threads presently. */ | |
230 | NOT_STOPPING_THREADS, | |
231 | ||
232 | /* Stopping threads. */ | |
233 | STOPPING_THREADS, | |
234 | ||
235 | /* Stopping and suspending threads. */ | |
236 | STOPPING_AND_SUSPENDING_THREADS | |
237 | }; | |
238 | ||
239 | /* This is set while stop_all_lwps is in effect. */ | |
240 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
241 | |
242 | /* FIXME make into a target method? */ | |
24a09b5f | 243 | int using_threads = 1; |
24a09b5f | 244 | |
fa593d66 PA |
245 | /* True if we're presently stabilizing threads (moving them out of |
246 | jump pads). */ | |
247 | static int stabilizing_threads; | |
248 | ||
2acc282a | 249 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 250 | int step, int signal, siginfo_t *info); |
2bd7c093 | 251 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
252 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
253 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
fa96cb38 PA |
254 | static int linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
255 | int *wstat, int options); | |
95954743 | 256 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
b3312d80 | 257 | static struct lwp_info *add_lwp (ptid_t ptid); |
94585166 | 258 | static void linux_mourn (struct process_info *process); |
c35fafde | 259 | static int linux_stopped_by_watchpoint (void); |
95954743 | 260 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
00db26fa | 261 | static int lwp_is_marked_dead (struct lwp_info *lwp); |
d50171e4 | 262 | static void proceed_all_lwps (void); |
d50171e4 | 263 | static int finish_step_over (struct lwp_info *lwp); |
d50171e4 | 264 | static int kill_lwp (unsigned long lwpid, int signo); |
863d01bd PA |
265 | static void enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info); |
266 | static void complete_ongoing_step_over (void); | |
ece66d65 | 267 | static int linux_low_ptrace_options (int attached); |
d50171e4 | 268 | |
582511be PA |
269 | /* When the event-loop is doing a step-over, this points at the thread |
270 | being stepped. */ | |
271 | ptid_t step_over_bkpt; | |
272 | ||
7d00775e | 273 | /* True if the low target can hardware single-step. */ |
d50171e4 PA |
274 | |
275 | static int | |
276 | can_hardware_single_step (void) | |
277 | { | |
7d00775e AT |
278 | if (the_low_target.supports_hardware_single_step != NULL) |
279 | return the_low_target.supports_hardware_single_step (); | |
280 | else | |
281 | return 0; | |
282 | } | |
283 | ||
284 | /* True if the low target can software single-step. Such targets | |
fa5308bd | 285 | implement the GET_NEXT_PCS callback. */ |
7d00775e AT |
286 | |
287 | static int | |
288 | can_software_single_step (void) | |
289 | { | |
fa5308bd | 290 | return (the_low_target.get_next_pcs != NULL); |
d50171e4 PA |
291 | } |
292 | ||
293 | /* True if the low target supports memory breakpoints. If so, we'll | |
294 | have a GET_PC implementation. */ | |
295 | ||
296 | static int | |
297 | supports_breakpoints (void) | |
298 | { | |
299 | return (the_low_target.get_pc != NULL); | |
300 | } | |
0d62e5e8 | 301 | |
fa593d66 PA |
302 | /* Returns true if this target can support fast tracepoints. This |
303 | does not mean that the in-process agent has been loaded in the | |
304 | inferior. */ | |
305 | ||
306 | static int | |
307 | supports_fast_tracepoints (void) | |
308 | { | |
309 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
310 | } | |
311 | ||
c2d6af84 PA |
312 | /* True if LWP is stopped in its stepping range. */ |
313 | ||
314 | static int | |
315 | lwp_in_step_range (struct lwp_info *lwp) | |
316 | { | |
317 | CORE_ADDR pc = lwp->stop_pc; | |
318 | ||
319 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
320 | } | |
321 | ||
0d62e5e8 DJ |
322 | struct pending_signals |
323 | { | |
324 | int signal; | |
32ca6d61 | 325 | siginfo_t info; |
0d62e5e8 DJ |
326 | struct pending_signals *prev; |
327 | }; | |
611cb4a5 | 328 | |
bd99dc85 PA |
329 | /* The read/write ends of the pipe registered as waitable file in the |
330 | event loop. */ | |
331 | static int linux_event_pipe[2] = { -1, -1 }; | |
332 | ||
333 | /* True if we're currently in async mode. */ | |
334 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
335 | ||
02fc4de7 | 336 | static void send_sigstop (struct lwp_info *lwp); |
fa96cb38 | 337 | static void wait_for_sigstop (void); |
bd99dc85 | 338 | |
d0722149 DE |
339 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
340 | ||
341 | static int | |
214d508e | 342 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 343 | { |
214d508e L |
344 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
345 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
346 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
347 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
348 | { | |
349 | *machine = header->e_machine; | |
350 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
351 | ||
352 | } | |
353 | *machine = EM_NONE; | |
354 | return -1; | |
d0722149 DE |
355 | } |
356 | ||
357 | /* Return non-zero if FILE is a 64-bit ELF file, | |
358 | zero if the file is not a 64-bit ELF file, | |
359 | and -1 if the file is not accessible or doesn't exist. */ | |
360 | ||
be07f1a2 | 361 | static int |
214d508e | 362 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 363 | { |
957f3f49 | 364 | Elf64_Ehdr header; |
d0722149 DE |
365 | int fd; |
366 | ||
367 | fd = open (file, O_RDONLY); | |
368 | if (fd < 0) | |
369 | return -1; | |
370 | ||
371 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
372 | { | |
373 | close (fd); | |
374 | return 0; | |
375 | } | |
376 | close (fd); | |
377 | ||
214d508e | 378 | return elf_64_header_p (&header, machine); |
d0722149 DE |
379 | } |
380 | ||
be07f1a2 PA |
381 | /* Accepts an integer PID; Returns true if the executable PID is |
382 | running is a 64-bit ELF file.. */ | |
383 | ||
384 | int | |
214d508e | 385 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 386 | { |
d8d2a3ee | 387 | char file[PATH_MAX]; |
be07f1a2 PA |
388 | |
389 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 390 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
391 | } |
392 | ||
bd99dc85 PA |
393 | static void |
394 | delete_lwp (struct lwp_info *lwp) | |
395 | { | |
fa96cb38 PA |
396 | struct thread_info *thr = get_lwp_thread (lwp); |
397 | ||
398 | if (debug_threads) | |
399 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
400 | ||
401 | remove_thread (thr); | |
aa5ca48f | 402 | free (lwp->arch_private); |
bd99dc85 PA |
403 | free (lwp); |
404 | } | |
405 | ||
95954743 PA |
406 | /* Add a process to the common process list, and set its private |
407 | data. */ | |
408 | ||
409 | static struct process_info * | |
410 | linux_add_process (int pid, int attached) | |
411 | { | |
412 | struct process_info *proc; | |
413 | ||
95954743 | 414 | proc = add_process (pid, attached); |
8d749320 | 415 | proc->priv = XCNEW (struct process_info_private); |
95954743 | 416 | |
aa5ca48f | 417 | if (the_low_target.new_process != NULL) |
fe978cb0 | 418 | proc->priv->arch_private = the_low_target.new_process (); |
aa5ca48f | 419 | |
95954743 PA |
420 | return proc; |
421 | } | |
422 | ||
582511be PA |
423 | static CORE_ADDR get_pc (struct lwp_info *lwp); |
424 | ||
ece66d65 | 425 | /* Call the target arch_setup function on the current thread. */ |
94585166 DB |
426 | |
427 | static void | |
428 | linux_arch_setup (void) | |
429 | { | |
430 | the_low_target.arch_setup (); | |
431 | } | |
432 | ||
433 | /* Call the target arch_setup function on THREAD. */ | |
434 | ||
435 | static void | |
436 | linux_arch_setup_thread (struct thread_info *thread) | |
437 | { | |
438 | struct thread_info *saved_thread; | |
439 | ||
440 | saved_thread = current_thread; | |
441 | current_thread = thread; | |
442 | ||
443 | linux_arch_setup (); | |
444 | ||
445 | current_thread = saved_thread; | |
446 | } | |
447 | ||
448 | /* Handle a GNU/Linux extended wait response. If we see a clone, | |
449 | fork, or vfork event, we need to add the new LWP to our list | |
450 | (and return 0 so as not to report the trap to higher layers). | |
451 | If we see an exec event, we will modify ORIG_EVENT_LWP to point | |
452 | to a new LWP representing the new program. */ | |
0d62e5e8 | 453 | |
de0d863e | 454 | static int |
94585166 | 455 | handle_extended_wait (struct lwp_info **orig_event_lwp, int wstat) |
24a09b5f | 456 | { |
94585166 | 457 | struct lwp_info *event_lwp = *orig_event_lwp; |
89a5711c | 458 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 459 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
54a0b537 | 460 | struct lwp_info *new_lwp; |
24a09b5f | 461 | |
65706a29 PA |
462 | gdb_assert (event_lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
463 | ||
c269dbdb DB |
464 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
465 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f | 466 | { |
95954743 | 467 | ptid_t ptid; |
24a09b5f | 468 | unsigned long new_pid; |
05044653 | 469 | int ret, status; |
24a09b5f | 470 | |
de0d863e | 471 | /* Get the pid of the new lwp. */ |
d86d4aaf | 472 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 473 | &new_pid); |
24a09b5f DJ |
474 | |
475 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 476 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
477 | { |
478 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
479 | hits the SIGSTOP, but we're already attached. */ | |
480 | ||
97438e3f | 481 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
482 | |
483 | if (ret == -1) | |
484 | perror_with_name ("waiting for new child"); | |
485 | else if (ret != new_pid) | |
486 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 487 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
488 | warning ("wait returned unexpected status 0x%x", status); |
489 | } | |
490 | ||
c269dbdb | 491 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
de0d863e DB |
492 | { |
493 | struct process_info *parent_proc; | |
494 | struct process_info *child_proc; | |
495 | struct lwp_info *child_lwp; | |
bfacd19d | 496 | struct thread_info *child_thr; |
de0d863e DB |
497 | struct target_desc *tdesc; |
498 | ||
499 | ptid = ptid_build (new_pid, new_pid, 0); | |
500 | ||
501 | if (debug_threads) | |
502 | { | |
503 | debug_printf ("HEW: Got fork event from LWP %ld, " | |
504 | "new child is %d\n", | |
505 | ptid_get_lwp (ptid_of (event_thr)), | |
506 | ptid_get_pid (ptid)); | |
507 | } | |
508 | ||
509 | /* Add the new process to the tables and clone the breakpoint | |
510 | lists of the parent. We need to do this even if the new process | |
511 | will be detached, since we will need the process object and the | |
512 | breakpoints to remove any breakpoints from memory when we | |
513 | detach, and the client side will access registers. */ | |
514 | child_proc = linux_add_process (new_pid, 0); | |
515 | gdb_assert (child_proc != NULL); | |
516 | child_lwp = add_lwp (ptid); | |
517 | gdb_assert (child_lwp != NULL); | |
518 | child_lwp->stopped = 1; | |
bfacd19d DB |
519 | child_lwp->must_set_ptrace_flags = 1; |
520 | child_lwp->status_pending_p = 0; | |
521 | child_thr = get_lwp_thread (child_lwp); | |
522 | child_thr->last_resume_kind = resume_stop; | |
998d452a PA |
523 | child_thr->last_status.kind = TARGET_WAITKIND_STOPPED; |
524 | ||
863d01bd PA |
525 | /* If we're suspending all threads, leave this one suspended |
526 | too. */ | |
527 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
528 | { | |
529 | if (debug_threads) | |
530 | debug_printf ("HEW: leaving child suspended\n"); | |
531 | child_lwp->suspended = 1; | |
532 | } | |
533 | ||
de0d863e DB |
534 | parent_proc = get_thread_process (event_thr); |
535 | child_proc->attached = parent_proc->attached; | |
536 | clone_all_breakpoints (&child_proc->breakpoints, | |
537 | &child_proc->raw_breakpoints, | |
538 | parent_proc->breakpoints); | |
539 | ||
8d749320 | 540 | tdesc = XNEW (struct target_desc); |
de0d863e DB |
541 | copy_target_description (tdesc, parent_proc->tdesc); |
542 | child_proc->tdesc = tdesc; | |
de0d863e | 543 | |
3a8a0396 DB |
544 | /* Clone arch-specific process data. */ |
545 | if (the_low_target.new_fork != NULL) | |
546 | the_low_target.new_fork (parent_proc, child_proc); | |
547 | ||
de0d863e | 548 | /* Save fork info in the parent thread. */ |
c269dbdb DB |
549 | if (event == PTRACE_EVENT_FORK) |
550 | event_lwp->waitstatus.kind = TARGET_WAITKIND_FORKED; | |
551 | else if (event == PTRACE_EVENT_VFORK) | |
552 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORKED; | |
553 | ||
de0d863e | 554 | event_lwp->waitstatus.value.related_pid = ptid; |
c269dbdb | 555 | |
de0d863e DB |
556 | /* The status_pending field contains bits denoting the |
557 | extended event, so when the pending event is handled, | |
558 | the handler will look at lwp->waitstatus. */ | |
559 | event_lwp->status_pending_p = 1; | |
560 | event_lwp->status_pending = wstat; | |
561 | ||
562 | /* Report the event. */ | |
563 | return 0; | |
564 | } | |
565 | ||
fa96cb38 PA |
566 | if (debug_threads) |
567 | debug_printf ("HEW: Got clone event " | |
568 | "from LWP %ld, new child is LWP %ld\n", | |
569 | lwpid_of (event_thr), new_pid); | |
570 | ||
d86d4aaf | 571 | ptid = ptid_build (pid_of (event_thr), new_pid, 0); |
b3312d80 | 572 | new_lwp = add_lwp (ptid); |
24a09b5f | 573 | |
e27d73f6 DE |
574 | /* Either we're going to immediately resume the new thread |
575 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
576 | thinks the thread is currently running, so set this first | |
577 | before calling linux_resume_one_lwp. */ | |
578 | new_lwp->stopped = 1; | |
579 | ||
bde24c0a PA |
580 | /* If we're suspending all threads, leave this one suspended |
581 | too. */ | |
582 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
583 | new_lwp->suspended = 1; | |
584 | ||
da5898ce DJ |
585 | /* Normally we will get the pending SIGSTOP. But in some cases |
586 | we might get another signal delivered to the group first. | |
f21cc1a2 | 587 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 588 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 589 | { |
54a0b537 | 590 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
591 | new_lwp->status_pending_p = 1; |
592 | new_lwp->status_pending = status; | |
da5898ce | 593 | } |
65706a29 PA |
594 | else if (report_thread_events) |
595 | { | |
596 | new_lwp->waitstatus.kind = TARGET_WAITKIND_THREAD_CREATED; | |
597 | new_lwp->status_pending_p = 1; | |
598 | new_lwp->status_pending = status; | |
599 | } | |
de0d863e DB |
600 | |
601 | /* Don't report the event. */ | |
602 | return 1; | |
24a09b5f | 603 | } |
c269dbdb DB |
604 | else if (event == PTRACE_EVENT_VFORK_DONE) |
605 | { | |
606 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
607 | ||
608 | /* Report the event. */ | |
609 | return 0; | |
610 | } | |
94585166 DB |
611 | else if (event == PTRACE_EVENT_EXEC && report_exec_events) |
612 | { | |
613 | struct process_info *proc; | |
614 | ptid_t event_ptid; | |
615 | pid_t event_pid; | |
616 | ||
617 | if (debug_threads) | |
618 | { | |
619 | debug_printf ("HEW: Got exec event from LWP %ld\n", | |
620 | lwpid_of (event_thr)); | |
621 | } | |
622 | ||
623 | /* Get the event ptid. */ | |
624 | event_ptid = ptid_of (event_thr); | |
625 | event_pid = ptid_get_pid (event_ptid); | |
626 | ||
627 | /* Delete the execing process and all its threads. */ | |
628 | proc = get_thread_process (event_thr); | |
629 | linux_mourn (proc); | |
630 | current_thread = NULL; | |
631 | ||
632 | /* Create a new process/lwp/thread. */ | |
633 | proc = linux_add_process (event_pid, 0); | |
634 | event_lwp = add_lwp (event_ptid); | |
635 | event_thr = get_lwp_thread (event_lwp); | |
636 | gdb_assert (current_thread == event_thr); | |
637 | linux_arch_setup_thread (event_thr); | |
638 | ||
639 | /* Set the event status. */ | |
640 | event_lwp->waitstatus.kind = TARGET_WAITKIND_EXECD; | |
641 | event_lwp->waitstatus.value.execd_pathname | |
642 | = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr))); | |
643 | ||
644 | /* Mark the exec status as pending. */ | |
645 | event_lwp->stopped = 1; | |
646 | event_lwp->status_pending_p = 1; | |
647 | event_lwp->status_pending = wstat; | |
648 | event_thr->last_resume_kind = resume_continue; | |
649 | event_thr->last_status.kind = TARGET_WAITKIND_IGNORE; | |
650 | ||
651 | /* Report the event. */ | |
652 | *orig_event_lwp = event_lwp; | |
653 | return 0; | |
654 | } | |
de0d863e DB |
655 | |
656 | internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event); | |
24a09b5f DJ |
657 | } |
658 | ||
d50171e4 PA |
659 | /* Return the PC as read from the regcache of LWP, without any |
660 | adjustment. */ | |
661 | ||
662 | static CORE_ADDR | |
663 | get_pc (struct lwp_info *lwp) | |
664 | { | |
0bfdf32f | 665 | struct thread_info *saved_thread; |
d50171e4 PA |
666 | struct regcache *regcache; |
667 | CORE_ADDR pc; | |
668 | ||
669 | if (the_low_target.get_pc == NULL) | |
670 | return 0; | |
671 | ||
0bfdf32f GB |
672 | saved_thread = current_thread; |
673 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 674 | |
0bfdf32f | 675 | regcache = get_thread_regcache (current_thread, 1); |
d50171e4 PA |
676 | pc = (*the_low_target.get_pc) (regcache); |
677 | ||
678 | if (debug_threads) | |
87ce2a04 | 679 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 680 | |
0bfdf32f | 681 | current_thread = saved_thread; |
d50171e4 PA |
682 | return pc; |
683 | } | |
684 | ||
685 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
686 | The SIGTRAP could mean several things. |
687 | ||
688 | On i386, where decr_pc_after_break is non-zero: | |
582511be PA |
689 | |
690 | If we were single-stepping this process using PTRACE_SINGLESTEP, we | |
691 | will get only the one SIGTRAP. The value of $eip will be the next | |
692 | instruction. If the instruction we stepped over was a breakpoint, | |
693 | we need to decrement the PC. | |
694 | ||
0d62e5e8 DJ |
695 | If we continue the process using PTRACE_CONT, we will get a |
696 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
697 | the instruction after the breakpoint (i.e. needs to be | |
698 | decremented). If we report the SIGTRAP to GDB, we must also | |
582511be | 699 | report the undecremented PC. If the breakpoint is removed, we |
0d62e5e8 DJ |
700 | must resume at the decremented PC. |
701 | ||
582511be PA |
702 | On a non-decr_pc_after_break machine with hardware or kernel |
703 | single-step: | |
704 | ||
705 | If we either single-step a breakpoint instruction, or continue and | |
706 | hit a breakpoint instruction, our PC will point at the breakpoint | |
0d62e5e8 DJ |
707 | instruction. */ |
708 | ||
582511be PA |
709 | static int |
710 | check_stopped_by_breakpoint (struct lwp_info *lwp) | |
0d62e5e8 | 711 | { |
582511be PA |
712 | CORE_ADDR pc; |
713 | CORE_ADDR sw_breakpoint_pc; | |
714 | struct thread_info *saved_thread; | |
3e572f71 PA |
715 | #if USE_SIGTRAP_SIGINFO |
716 | siginfo_t siginfo; | |
717 | #endif | |
d50171e4 PA |
718 | |
719 | if (the_low_target.get_pc == NULL) | |
720 | return 0; | |
0d62e5e8 | 721 | |
582511be PA |
722 | pc = get_pc (lwp); |
723 | sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break; | |
d50171e4 | 724 | |
582511be PA |
725 | /* breakpoint_at reads from the current thread. */ |
726 | saved_thread = current_thread; | |
727 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 728 | |
3e572f71 PA |
729 | #if USE_SIGTRAP_SIGINFO |
730 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
731 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
732 | { | |
733 | if (siginfo.si_signo == SIGTRAP) | |
734 | { | |
1db33b5a | 735 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) |
3e572f71 PA |
736 | { |
737 | if (debug_threads) | |
738 | { | |
739 | struct thread_info *thr = get_lwp_thread (lwp); | |
740 | ||
2bf6fb9d | 741 | debug_printf ("CSBB: %s stopped by software breakpoint\n", |
3e572f71 PA |
742 | target_pid_to_str (ptid_of (thr))); |
743 | } | |
744 | ||
745 | /* Back up the PC if necessary. */ | |
746 | if (pc != sw_breakpoint_pc) | |
747 | { | |
748 | struct regcache *regcache | |
749 | = get_thread_regcache (current_thread, 1); | |
750 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
751 | } | |
752 | ||
753 | lwp->stop_pc = sw_breakpoint_pc; | |
754 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
755 | current_thread = saved_thread; | |
756 | return 1; | |
757 | } | |
758 | else if (siginfo.si_code == TRAP_HWBKPT) | |
759 | { | |
760 | if (debug_threads) | |
761 | { | |
762 | struct thread_info *thr = get_lwp_thread (lwp); | |
763 | ||
2bf6fb9d PA |
764 | debug_printf ("CSBB: %s stopped by hardware " |
765 | "breakpoint/watchpoint\n", | |
3e572f71 PA |
766 | target_pid_to_str (ptid_of (thr))); |
767 | } | |
768 | ||
769 | lwp->stop_pc = pc; | |
770 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
771 | current_thread = saved_thread; | |
772 | return 1; | |
773 | } | |
2bf6fb9d PA |
774 | else if (siginfo.si_code == TRAP_TRACE) |
775 | { | |
776 | if (debug_threads) | |
777 | { | |
778 | struct thread_info *thr = get_lwp_thread (lwp); | |
779 | ||
780 | debug_printf ("CSBB: %s stopped by trace\n", | |
781 | target_pid_to_str (ptid_of (thr))); | |
782 | } | |
863d01bd PA |
783 | |
784 | lwp->stop_reason = TARGET_STOPPED_BY_SINGLE_STEP; | |
2bf6fb9d | 785 | } |
3e572f71 PA |
786 | } |
787 | } | |
788 | #else | |
582511be PA |
789 | /* We may have just stepped a breakpoint instruction. E.g., in |
790 | non-stop mode, GDB first tells the thread A to step a range, and | |
791 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
792 | case we need to report the breakpoint PC. */ |
793 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
582511be PA |
794 | && (*the_low_target.breakpoint_at) (sw_breakpoint_pc)) |
795 | { | |
796 | if (debug_threads) | |
797 | { | |
798 | struct thread_info *thr = get_lwp_thread (lwp); | |
799 | ||
800 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
801 | target_pid_to_str (ptid_of (thr))); | |
802 | } | |
803 | ||
804 | /* Back up the PC if necessary. */ | |
805 | if (pc != sw_breakpoint_pc) | |
806 | { | |
807 | struct regcache *regcache | |
808 | = get_thread_regcache (current_thread, 1); | |
809 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
810 | } | |
811 | ||
812 | lwp->stop_pc = sw_breakpoint_pc; | |
15c66dd6 | 813 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
582511be PA |
814 | current_thread = saved_thread; |
815 | return 1; | |
816 | } | |
817 | ||
818 | if (hardware_breakpoint_inserted_here (pc)) | |
819 | { | |
820 | if (debug_threads) | |
821 | { | |
822 | struct thread_info *thr = get_lwp_thread (lwp); | |
823 | ||
824 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
825 | target_pid_to_str (ptid_of (thr))); | |
826 | } | |
47c0c975 | 827 | |
582511be | 828 | lwp->stop_pc = pc; |
15c66dd6 | 829 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; |
582511be PA |
830 | current_thread = saved_thread; |
831 | return 1; | |
832 | } | |
3e572f71 | 833 | #endif |
582511be PA |
834 | |
835 | current_thread = saved_thread; | |
836 | return 0; | |
0d62e5e8 | 837 | } |
ce3a066d | 838 | |
b3312d80 | 839 | static struct lwp_info * |
95954743 | 840 | add_lwp (ptid_t ptid) |
611cb4a5 | 841 | { |
54a0b537 | 842 | struct lwp_info *lwp; |
0d62e5e8 | 843 | |
8d749320 | 844 | lwp = XCNEW (struct lwp_info); |
00db26fa PA |
845 | |
846 | lwp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
0d62e5e8 | 847 | |
aa5ca48f | 848 | if (the_low_target.new_thread != NULL) |
34c703da | 849 | the_low_target.new_thread (lwp); |
aa5ca48f | 850 | |
f7667f0d | 851 | lwp->thread = add_thread (ptid, lwp); |
0d62e5e8 | 852 | |
54a0b537 | 853 | return lwp; |
0d62e5e8 | 854 | } |
611cb4a5 | 855 | |
da6d8c04 DJ |
856 | /* Start an inferior process and returns its pid. |
857 | ALLARGS is a vector of program-name and args. */ | |
858 | ||
ce3a066d DJ |
859 | static int |
860 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 861 | { |
a6dbe5df | 862 | struct lwp_info *new_lwp; |
da6d8c04 | 863 | int pid; |
95954743 | 864 | ptid_t ptid; |
8cc73a39 SDJ |
865 | struct cleanup *restore_personality |
866 | = maybe_disable_address_space_randomization (disable_randomization); | |
03583c20 | 867 | |
42c81e2a | 868 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
869 | pid = vfork (); |
870 | #else | |
da6d8c04 | 871 | pid = fork (); |
52fb6437 | 872 | #endif |
da6d8c04 DJ |
873 | if (pid < 0) |
874 | perror_with_name ("fork"); | |
875 | ||
876 | if (pid == 0) | |
877 | { | |
602e3198 | 878 | close_most_fds (); |
b8e1b30e | 879 | ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da6d8c04 | 880 | |
a9fa9f7d DJ |
881 | setpgid (0, 0); |
882 | ||
e0f9f062 DE |
883 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
884 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
885 | Also, redirect stdin to /dev/null. */ | |
886 | if (remote_connection_is_stdio ()) | |
887 | { | |
888 | close (0); | |
889 | open ("/dev/null", O_RDONLY); | |
890 | dup2 (2, 1); | |
3e52c33d JK |
891 | if (write (2, "stdin/stdout redirected\n", |
892 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
893 | { |
894 | /* Errors ignored. */; | |
895 | } | |
e0f9f062 DE |
896 | } |
897 | ||
2b876972 DJ |
898 | execv (program, allargs); |
899 | if (errno == ENOENT) | |
900 | execvp (program, allargs); | |
da6d8c04 DJ |
901 | |
902 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 903 | strerror (errno)); |
da6d8c04 DJ |
904 | fflush (stderr); |
905 | _exit (0177); | |
906 | } | |
907 | ||
8cc73a39 | 908 | do_cleanups (restore_personality); |
03583c20 | 909 | |
55d7b841 | 910 | linux_add_process (pid, 0); |
95954743 PA |
911 | |
912 | ptid = ptid_build (pid, pid, 0); | |
913 | new_lwp = add_lwp (ptid); | |
a6dbe5df | 914 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 915 | |
a9fa9f7d | 916 | return pid; |
da6d8c04 DJ |
917 | } |
918 | ||
ece66d65 JS |
919 | /* Implement the post_create_inferior target_ops method. */ |
920 | ||
921 | static void | |
922 | linux_post_create_inferior (void) | |
923 | { | |
924 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
925 | ||
926 | linux_arch_setup (); | |
927 | ||
928 | if (lwp->must_set_ptrace_flags) | |
929 | { | |
930 | struct process_info *proc = current_process (); | |
931 | int options = linux_low_ptrace_options (proc->attached); | |
932 | ||
933 | linux_enable_event_reporting (lwpid_of (current_thread), options); | |
934 | lwp->must_set_ptrace_flags = 0; | |
935 | } | |
936 | } | |
937 | ||
8784d563 PA |
938 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
939 | error. */ | |
da6d8c04 | 940 | |
7ae1a6a6 PA |
941 | int |
942 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 943 | { |
54a0b537 | 944 | struct lwp_info *new_lwp; |
7ae1a6a6 | 945 | int lwpid = ptid_get_lwp (ptid); |
611cb4a5 | 946 | |
b8e1b30e | 947 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 948 | != 0) |
7ae1a6a6 | 949 | return errno; |
24a09b5f | 950 | |
b3312d80 | 951 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 952 | |
a6dbe5df PA |
953 | /* We need to wait for SIGSTOP before being able to make the next |
954 | ptrace call on this LWP. */ | |
955 | new_lwp->must_set_ptrace_flags = 1; | |
956 | ||
644cebc9 | 957 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
958 | { |
959 | if (debug_threads) | |
87ce2a04 | 960 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
961 | |
962 | /* The process is definitely stopped. It is in a job control | |
963 | stop, unless the kernel predates the TASK_STOPPED / | |
964 | TASK_TRACED distinction, in which case it might be in a | |
965 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
966 | can kill it, signal it, et cetera. | |
967 | ||
968 | First make sure there is a pending SIGSTOP. Since we are | |
969 | already attached, the process can not transition from stopped | |
970 | to running without a PTRACE_CONT; so we know this signal will | |
971 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
972 | probably already in the queue (unless this kernel is old | |
973 | enough to use TASK_STOPPED for ptrace stops); but since | |
974 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
975 | kill_lwp (lwpid, SIGSTOP); | |
976 | ||
977 | /* Finally, resume the stopped process. This will deliver the | |
978 | SIGSTOP (or a higher priority signal, just like normal | |
979 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 980 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
981 | } |
982 | ||
0d62e5e8 | 983 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
984 | brings it to a halt. |
985 | ||
986 | There are several cases to consider here: | |
987 | ||
988 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 989 | of a new thread that is being created. |
d50171e4 PA |
990 | In this case we should ignore that SIGSTOP and resume the |
991 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 992 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 993 | resume_continue. |
0e21c1ec DE |
994 | |
995 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
996 | to it via attach_inferior. |
997 | In this case we want the process thread to stop. | |
d50171e4 PA |
998 | This is handled by having linux_attach set last_resume_kind == |
999 | resume_stop after we return. | |
e3deef73 LM |
1000 | |
1001 | If the pid we are attaching to is also the tgid, we attach to and | |
1002 | stop all the existing threads. Otherwise, we attach to pid and | |
1003 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
1004 | |
1005 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
1006 | existing threads. |
1007 | In this case we want the thread to stop. | |
1008 | FIXME: This case is currently not properly handled. | |
1009 | We should wait for the SIGSTOP but don't. Things work apparently | |
1010 | because enough time passes between when we ptrace (ATTACH) and when | |
1011 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
1012 | |
1013 | On the other hand, if we are currently trying to stop all threads, we | |
1014 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 1015 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
1016 | end of the list, and so the new thread has not yet reached |
1017 | wait_for_sigstop (but will). */ | |
d50171e4 | 1018 | new_lwp->stop_expected = 1; |
0d62e5e8 | 1019 | |
7ae1a6a6 | 1020 | return 0; |
95954743 PA |
1021 | } |
1022 | ||
8784d563 PA |
1023 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
1024 | already attached. Returns true if a new LWP is found, false | |
1025 | otherwise. */ | |
1026 | ||
1027 | static int | |
1028 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1029 | { | |
1030 | /* Is this a new thread? */ | |
1031 | if (find_thread_ptid (ptid) == NULL) | |
1032 | { | |
1033 | int lwpid = ptid_get_lwp (ptid); | |
1034 | int err; | |
1035 | ||
1036 | if (debug_threads) | |
1037 | debug_printf ("Found new lwp %d\n", lwpid); | |
1038 | ||
1039 | err = linux_attach_lwp (ptid); | |
1040 | ||
1041 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
1042 | is returned if the thread's task still exists, and is marked | |
1043 | as exited or zombie, as well as other conditions, so in that | |
1044 | case, confirm the status in /proc/PID/status. */ | |
1045 | if (err == ESRCH | |
1046 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
1047 | { | |
1048 | if (debug_threads) | |
1049 | { | |
1050 | debug_printf ("Cannot attach to lwp %d: " | |
1051 | "thread is gone (%d: %s)\n", | |
1052 | lwpid, err, strerror (err)); | |
1053 | } | |
1054 | } | |
1055 | else if (err != 0) | |
1056 | { | |
1057 | warning (_("Cannot attach to lwp %d: %s"), | |
1058 | lwpid, | |
1059 | linux_ptrace_attach_fail_reason_string (ptid, err)); | |
1060 | } | |
1061 | ||
1062 | return 1; | |
1063 | } | |
1064 | return 0; | |
1065 | } | |
1066 | ||
500c1d85 PA |
1067 | static void async_file_mark (void); |
1068 | ||
e3deef73 LM |
1069 | /* Attach to PID. If PID is the tgid, attach to it and all |
1070 | of its threads. */ | |
1071 | ||
c52daf70 | 1072 | static int |
a1928bad | 1073 | linux_attach (unsigned long pid) |
0d62e5e8 | 1074 | { |
500c1d85 PA |
1075 | struct process_info *proc; |
1076 | struct thread_info *initial_thread; | |
7ae1a6a6 PA |
1077 | ptid_t ptid = ptid_build (pid, pid, 0); |
1078 | int err; | |
1079 | ||
e3deef73 LM |
1080 | /* Attach to PID. We will check for other threads |
1081 | soon. */ | |
7ae1a6a6 PA |
1082 | err = linux_attach_lwp (ptid); |
1083 | if (err != 0) | |
1084 | error ("Cannot attach to process %ld: %s", | |
8784d563 | 1085 | pid, linux_ptrace_attach_fail_reason_string (ptid, err)); |
7ae1a6a6 | 1086 | |
500c1d85 | 1087 | proc = linux_add_process (pid, 1); |
0d62e5e8 | 1088 | |
500c1d85 PA |
1089 | /* Don't ignore the initial SIGSTOP if we just attached to this |
1090 | process. It will be collected by wait shortly. */ | |
1091 | initial_thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
1092 | initial_thread->last_resume_kind = resume_stop; | |
0d62e5e8 | 1093 | |
8784d563 PA |
1094 | /* We must attach to every LWP. If /proc is mounted, use that to |
1095 | find them now. On the one hand, the inferior may be using raw | |
1096 | clone instead of using pthreads. On the other hand, even if it | |
1097 | is using pthreads, GDB may not be connected yet (thread_db needs | |
1098 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
1099 | structures in the inferior's address space to find the list of | |
1100 | threads/LWPs, and those structures may well be corrupted. Note | |
1101 | that once thread_db is loaded, we'll still use it to list threads | |
1102 | and associate pthread info with each LWP. */ | |
1103 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
500c1d85 PA |
1104 | |
1105 | /* GDB will shortly read the xml target description for this | |
1106 | process, to figure out the process' architecture. But the target | |
1107 | description is only filled in when the first process/thread in | |
1108 | the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do | |
1109 | that now, otherwise, if GDB is fast enough, it could read the | |
1110 | target description _before_ that initial stop. */ | |
1111 | if (non_stop) | |
1112 | { | |
1113 | struct lwp_info *lwp; | |
1114 | int wstat, lwpid; | |
1115 | ptid_t pid_ptid = pid_to_ptid (pid); | |
1116 | ||
1117 | lwpid = linux_wait_for_event_filtered (pid_ptid, pid_ptid, | |
1118 | &wstat, __WALL); | |
1119 | gdb_assert (lwpid > 0); | |
1120 | ||
1121 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); | |
1122 | ||
1123 | if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGSTOP) | |
1124 | { | |
1125 | lwp->status_pending_p = 1; | |
1126 | lwp->status_pending = wstat; | |
1127 | } | |
1128 | ||
1129 | initial_thread->last_resume_kind = resume_continue; | |
1130 | ||
1131 | async_file_mark (); | |
1132 | ||
1133 | gdb_assert (proc->tdesc != NULL); | |
1134 | } | |
1135 | ||
95954743 PA |
1136 | return 0; |
1137 | } | |
1138 | ||
1139 | struct counter | |
1140 | { | |
1141 | int pid; | |
1142 | int count; | |
1143 | }; | |
1144 | ||
1145 | static int | |
1146 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
1147 | { | |
9a3c8263 | 1148 | struct counter *counter = (struct counter *) args; |
95954743 PA |
1149 | |
1150 | if (ptid_get_pid (entry->id) == counter->pid) | |
1151 | { | |
1152 | if (++counter->count > 1) | |
1153 | return 1; | |
1154 | } | |
d61ddec4 | 1155 | |
da6d8c04 DJ |
1156 | return 0; |
1157 | } | |
1158 | ||
95954743 | 1159 | static int |
fa96cb38 | 1160 | last_thread_of_process_p (int pid) |
95954743 | 1161 | { |
95954743 | 1162 | struct counter counter = { pid , 0 }; |
da6d8c04 | 1163 | |
95954743 PA |
1164 | return (find_inferior (&all_threads, |
1165 | second_thread_of_pid_p, &counter) == NULL); | |
1166 | } | |
1167 | ||
da84f473 PA |
1168 | /* Kill LWP. */ |
1169 | ||
1170 | static void | |
1171 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1172 | { | |
d86d4aaf DE |
1173 | struct thread_info *thr = get_lwp_thread (lwp); |
1174 | int pid = lwpid_of (thr); | |
da84f473 PA |
1175 | |
1176 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1177 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1178 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1179 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1180 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1181 | per process, not one for each thread. But since we still support | |
4a6ed09b PA |
1182 | support debugging programs using raw clone without CLONE_THREAD, |
1183 | we send one for each thread. For years, we used PTRACE_KILL | |
1184 | only, so we're being a bit paranoid about some old kernels where | |
1185 | PTRACE_KILL might work better (dubious if there are any such, but | |
1186 | that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL | |
1187 | second, and so we're fine everywhere. */ | |
da84f473 PA |
1188 | |
1189 | errno = 0; | |
69ff6be5 | 1190 | kill_lwp (pid, SIGKILL); |
da84f473 | 1191 | if (debug_threads) |
ce9e3fe7 PA |
1192 | { |
1193 | int save_errno = errno; | |
1194 | ||
1195 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
1196 | target_pid_to_str (ptid_of (thr)), | |
1197 | save_errno ? strerror (save_errno) : "OK"); | |
1198 | } | |
da84f473 PA |
1199 | |
1200 | errno = 0; | |
b8e1b30e | 1201 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1202 | if (debug_threads) |
ce9e3fe7 PA |
1203 | { |
1204 | int save_errno = errno; | |
1205 | ||
1206 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
1207 | target_pid_to_str (ptid_of (thr)), | |
1208 | save_errno ? strerror (save_errno) : "OK"); | |
1209 | } | |
da84f473 PA |
1210 | } |
1211 | ||
e76126e8 PA |
1212 | /* Kill LWP and wait for it to die. */ |
1213 | ||
1214 | static void | |
1215 | kill_wait_lwp (struct lwp_info *lwp) | |
1216 | { | |
1217 | struct thread_info *thr = get_lwp_thread (lwp); | |
1218 | int pid = ptid_get_pid (ptid_of (thr)); | |
1219 | int lwpid = ptid_get_lwp (ptid_of (thr)); | |
1220 | int wstat; | |
1221 | int res; | |
1222 | ||
1223 | if (debug_threads) | |
1224 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
1225 | ||
1226 | do | |
1227 | { | |
1228 | linux_kill_one_lwp (lwp); | |
1229 | ||
1230 | /* Make sure it died. Notes: | |
1231 | ||
1232 | - The loop is most likely unnecessary. | |
1233 | ||
1234 | - We don't use linux_wait_for_event as that could delete lwps | |
1235 | while we're iterating over them. We're not interested in | |
1236 | any pending status at this point, only in making sure all | |
1237 | wait status on the kernel side are collected until the | |
1238 | process is reaped. | |
1239 | ||
1240 | - We don't use __WALL here as the __WALL emulation relies on | |
1241 | SIGCHLD, and killing a stopped process doesn't generate | |
1242 | one, nor an exit status. | |
1243 | */ | |
1244 | res = my_waitpid (lwpid, &wstat, 0); | |
1245 | if (res == -1 && errno == ECHILD) | |
1246 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1247 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1248 | ||
586b02a9 PA |
1249 | /* Even if it was stopped, the child may have already disappeared. |
1250 | E.g., if it was killed by SIGKILL. */ | |
1251 | if (res < 0 && errno != ECHILD) | |
1252 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1253 | } |
1254 | ||
da84f473 PA |
1255 | /* Callback for `find_inferior'. Kills an lwp of a given process, |
1256 | except the leader. */ | |
95954743 PA |
1257 | |
1258 | static int | |
da84f473 | 1259 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 1260 | { |
0d62e5e8 | 1261 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 1262 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
1263 | int pid = * (int *) args; |
1264 | ||
1265 | if (ptid_get_pid (entry->id) != pid) | |
1266 | return 0; | |
0d62e5e8 | 1267 | |
fd500816 DJ |
1268 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1269 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1270 | the children get a chance to be reaped, it will remain a zombie | |
1271 | forever. */ | |
95954743 | 1272 | |
d86d4aaf | 1273 | if (lwpid_of (thread) == pid) |
95954743 PA |
1274 | { |
1275 | if (debug_threads) | |
87ce2a04 DE |
1276 | debug_printf ("lkop: is last of process %s\n", |
1277 | target_pid_to_str (entry->id)); | |
95954743 PA |
1278 | return 0; |
1279 | } | |
fd500816 | 1280 | |
e76126e8 | 1281 | kill_wait_lwp (lwp); |
95954743 | 1282 | return 0; |
da6d8c04 DJ |
1283 | } |
1284 | ||
95954743 PA |
1285 | static int |
1286 | linux_kill (int pid) | |
0d62e5e8 | 1287 | { |
95954743 | 1288 | struct process_info *process; |
54a0b537 | 1289 | struct lwp_info *lwp; |
fd500816 | 1290 | |
95954743 PA |
1291 | process = find_process_pid (pid); |
1292 | if (process == NULL) | |
1293 | return -1; | |
9d606399 | 1294 | |
f9e39928 PA |
1295 | /* If we're killing a running inferior, make sure it is stopped |
1296 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1297 | stop_all_lwps (0, NULL); |
f9e39928 | 1298 | |
da84f473 | 1299 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1300 | |
54a0b537 | 1301 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1302 | thread in the list, so do so now. */ |
95954743 | 1303 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1304 | |
784867a5 | 1305 | if (lwp == NULL) |
fd500816 | 1306 | { |
784867a5 | 1307 | if (debug_threads) |
d86d4aaf DE |
1308 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1309 | pid); | |
784867a5 JK |
1310 | } |
1311 | else | |
e76126e8 | 1312 | kill_wait_lwp (lwp); |
2d717e4f | 1313 | |
8336d594 | 1314 | the_target->mourn (process); |
f9e39928 PA |
1315 | |
1316 | /* Since we presently can only stop all lwps of all processes, we | |
1317 | need to unstop lwps of other processes. */ | |
7984d532 | 1318 | unstop_all_lwps (0, NULL); |
95954743 | 1319 | return 0; |
0d62e5e8 DJ |
1320 | } |
1321 | ||
9b224c5e PA |
1322 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1323 | signal the thread last stopped for, which we need to deliver to the | |
1324 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1325 | ||
1326 | static int | |
1327 | get_detach_signal (struct thread_info *thread) | |
1328 | { | |
a493e3e2 | 1329 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1330 | int status; |
1331 | struct lwp_info *lp = get_thread_lwp (thread); | |
1332 | ||
1333 | if (lp->status_pending_p) | |
1334 | status = lp->status_pending; | |
1335 | else | |
1336 | { | |
1337 | /* If the thread had been suspended by gdbserver, and it stopped | |
1338 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1339 | want to deliver that SIGSTOP. */ | |
1340 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1341 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1342 | return 0; |
1343 | ||
1344 | /* Otherwise, we may need to deliver the signal we | |
1345 | intercepted. */ | |
1346 | status = lp->last_status; | |
1347 | } | |
1348 | ||
1349 | if (!WIFSTOPPED (status)) | |
1350 | { | |
1351 | if (debug_threads) | |
87ce2a04 | 1352 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1353 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1354 | return 0; |
1355 | } | |
1356 | ||
1357 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1358 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1359 | { |
1360 | if (debug_threads) | |
87ce2a04 DE |
1361 | debug_printf ("GPS: lwp %s had stopped with extended " |
1362 | "status: no pending signal\n", | |
d86d4aaf | 1363 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1364 | return 0; |
1365 | } | |
1366 | ||
2ea28649 | 1367 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1368 | |
1369 | if (program_signals_p && !program_signals[signo]) | |
1370 | { | |
1371 | if (debug_threads) | |
87ce2a04 | 1372 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1373 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1374 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1375 | return 0; |
1376 | } | |
1377 | else if (!program_signals_p | |
1378 | /* If we have no way to know which signals GDB does not | |
1379 | want to have passed to the program, assume | |
1380 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1381 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1382 | { |
1383 | if (debug_threads) | |
87ce2a04 DE |
1384 | debug_printf ("GPS: lwp %s had signal %s, " |
1385 | "but we don't know if we should pass it. " | |
1386 | "Default to not.\n", | |
d86d4aaf | 1387 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1388 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1389 | return 0; |
1390 | } | |
1391 | else | |
1392 | { | |
1393 | if (debug_threads) | |
87ce2a04 | 1394 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1395 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1396 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1397 | |
1398 | return WSTOPSIG (status); | |
1399 | } | |
1400 | } | |
1401 | ||
95954743 PA |
1402 | static int |
1403 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1404 | { |
1405 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1406 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1407 | int pid = * (int *) args; |
9b224c5e | 1408 | int sig; |
95954743 PA |
1409 | |
1410 | if (ptid_get_pid (entry->id) != pid) | |
1411 | return 0; | |
6ad8ae5c | 1412 | |
9b224c5e | 1413 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1414 | if (lwp->stop_expected) |
ae13219e | 1415 | { |
9b224c5e | 1416 | if (debug_threads) |
87ce2a04 | 1417 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1418 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1419 | |
d86d4aaf | 1420 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1421 | lwp->stop_expected = 0; |
ae13219e DJ |
1422 | } |
1423 | ||
1424 | /* Flush any pending changes to the process's registers. */ | |
d86d4aaf | 1425 | regcache_invalidate_thread (thread); |
ae13219e | 1426 | |
9b224c5e PA |
1427 | /* Pass on any pending signal for this thread. */ |
1428 | sig = get_detach_signal (thread); | |
1429 | ||
ae13219e | 1430 | /* Finally, let it resume. */ |
82bfbe7e PA |
1431 | if (the_low_target.prepare_to_resume != NULL) |
1432 | the_low_target.prepare_to_resume (lwp); | |
d86d4aaf | 1433 | if (ptrace (PTRACE_DETACH, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
b8e1b30e | 1434 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
9b224c5e | 1435 | error (_("Can't detach %s: %s"), |
d86d4aaf | 1436 | target_pid_to_str (ptid_of (thread)), |
9b224c5e | 1437 | strerror (errno)); |
bd99dc85 PA |
1438 | |
1439 | delete_lwp (lwp); | |
95954743 | 1440 | return 0; |
6ad8ae5c DJ |
1441 | } |
1442 | ||
95954743 PA |
1443 | static int |
1444 | linux_detach (int pid) | |
1445 | { | |
1446 | struct process_info *process; | |
1447 | ||
1448 | process = find_process_pid (pid); | |
1449 | if (process == NULL) | |
1450 | return -1; | |
1451 | ||
863d01bd PA |
1452 | /* As there's a step over already in progress, let it finish first, |
1453 | otherwise nesting a stabilize_threads operation on top gets real | |
1454 | messy. */ | |
1455 | complete_ongoing_step_over (); | |
1456 | ||
f9e39928 PA |
1457 | /* Stop all threads before detaching. First, ptrace requires that |
1458 | the thread is stopped to sucessfully detach. Second, thread_db | |
1459 | may need to uninstall thread event breakpoints from memory, which | |
1460 | only works with a stopped process anyway. */ | |
7984d532 | 1461 | stop_all_lwps (0, NULL); |
f9e39928 | 1462 | |
ca5c370d | 1463 | #ifdef USE_THREAD_DB |
8336d594 | 1464 | thread_db_detach (process); |
ca5c370d PA |
1465 | #endif |
1466 | ||
fa593d66 PA |
1467 | /* Stabilize threads (move out of jump pads). */ |
1468 | stabilize_threads (); | |
1469 | ||
95954743 | 1470 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1471 | |
1472 | the_target->mourn (process); | |
f9e39928 PA |
1473 | |
1474 | /* Since we presently can only stop all lwps of all processes, we | |
1475 | need to unstop lwps of other processes. */ | |
7984d532 | 1476 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1477 | return 0; |
1478 | } | |
1479 | ||
1480 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1481 | ||
1482 | static int | |
1483 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1484 | { | |
d86d4aaf DE |
1485 | struct thread_info *thread = (struct thread_info *) entry; |
1486 | struct lwp_info *lwp = get_thread_lwp (thread); | |
9a3c8263 | 1487 | struct process_info *process = (struct process_info *) proc; |
f9e39928 | 1488 | |
d86d4aaf | 1489 | if (pid_of (thread) == pid_of (process)) |
f9e39928 PA |
1490 | delete_lwp (lwp); |
1491 | ||
dd6953e1 | 1492 | return 0; |
6ad8ae5c DJ |
1493 | } |
1494 | ||
8336d594 PA |
1495 | static void |
1496 | linux_mourn (struct process_info *process) | |
1497 | { | |
1498 | struct process_info_private *priv; | |
1499 | ||
1500 | #ifdef USE_THREAD_DB | |
1501 | thread_db_mourn (process); | |
1502 | #endif | |
1503 | ||
d86d4aaf | 1504 | find_inferior (&all_threads, delete_lwp_callback, process); |
f9e39928 | 1505 | |
8336d594 | 1506 | /* Freeing all private data. */ |
fe978cb0 | 1507 | priv = process->priv; |
8336d594 PA |
1508 | free (priv->arch_private); |
1509 | free (priv); | |
fe978cb0 | 1510 | process->priv = NULL; |
505106cd PA |
1511 | |
1512 | remove_process (process); | |
8336d594 PA |
1513 | } |
1514 | ||
444d6139 | 1515 | static void |
95954743 | 1516 | linux_join (int pid) |
444d6139 | 1517 | { |
444d6139 PA |
1518 | int status, ret; |
1519 | ||
1520 | do { | |
95954743 | 1521 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1522 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1523 | break; | |
1524 | } while (ret != -1 || errno != ECHILD); | |
1525 | } | |
1526 | ||
6ad8ae5c | 1527 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1528 | static int |
95954743 | 1529 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1530 | { |
95954743 PA |
1531 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1532 | ||
1533 | /* We assume we always know if a thread exits. If a whole process | |
1534 | exited but we still haven't been able to report it to GDB, we'll | |
1535 | hold on to the last lwp of the dead process. */ | |
1536 | if (lwp != NULL) | |
00db26fa | 1537 | return !lwp_is_marked_dead (lwp); |
0d62e5e8 DJ |
1538 | else |
1539 | return 0; | |
1540 | } | |
1541 | ||
582511be PA |
1542 | /* Return 1 if this lwp still has an interesting status pending. If |
1543 | not (e.g., it had stopped for a breakpoint that is gone), return | |
1544 | false. */ | |
1545 | ||
1546 | static int | |
1547 | thread_still_has_status_pending_p (struct thread_info *thread) | |
1548 | { | |
1549 | struct lwp_info *lp = get_thread_lwp (thread); | |
1550 | ||
1551 | if (!lp->status_pending_p) | |
1552 | return 0; | |
1553 | ||
582511be | 1554 | if (thread->last_resume_kind != resume_stop |
15c66dd6 PA |
1555 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1556 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1557 | { |
1558 | struct thread_info *saved_thread; | |
1559 | CORE_ADDR pc; | |
1560 | int discard = 0; | |
1561 | ||
1562 | gdb_assert (lp->last_status != 0); | |
1563 | ||
1564 | pc = get_pc (lp); | |
1565 | ||
1566 | saved_thread = current_thread; | |
1567 | current_thread = thread; | |
1568 | ||
1569 | if (pc != lp->stop_pc) | |
1570 | { | |
1571 | if (debug_threads) | |
1572 | debug_printf ("PC of %ld changed\n", | |
1573 | lwpid_of (thread)); | |
1574 | discard = 1; | |
1575 | } | |
3e572f71 PA |
1576 | |
1577 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1578 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
582511be PA |
1579 | && !(*the_low_target.breakpoint_at) (pc)) |
1580 | { | |
1581 | if (debug_threads) | |
1582 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1583 | lwpid_of (thread)); | |
1584 | discard = 1; | |
1585 | } | |
15c66dd6 | 1586 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1587 | && !hardware_breakpoint_inserted_here (pc)) |
1588 | { | |
1589 | if (debug_threads) | |
1590 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1591 | lwpid_of (thread)); | |
1592 | discard = 1; | |
1593 | } | |
3e572f71 | 1594 | #endif |
582511be PA |
1595 | |
1596 | current_thread = saved_thread; | |
1597 | ||
1598 | if (discard) | |
1599 | { | |
1600 | if (debug_threads) | |
1601 | debug_printf ("discarding pending breakpoint status\n"); | |
1602 | lp->status_pending_p = 0; | |
1603 | return 0; | |
1604 | } | |
1605 | } | |
1606 | ||
1607 | return 1; | |
1608 | } | |
1609 | ||
a681f9c9 PA |
1610 | /* Returns true if LWP is resumed from the client's perspective. */ |
1611 | ||
1612 | static int | |
1613 | lwp_resumed (struct lwp_info *lwp) | |
1614 | { | |
1615 | struct thread_info *thread = get_lwp_thread (lwp); | |
1616 | ||
1617 | if (thread->last_resume_kind != resume_stop) | |
1618 | return 1; | |
1619 | ||
1620 | /* Did gdb send us a `vCont;t', but we haven't reported the | |
1621 | corresponding stop to gdb yet? If so, the thread is still | |
1622 | resumed/running from gdb's perspective. */ | |
1623 | if (thread->last_resume_kind == resume_stop | |
1624 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
1625 | return 1; | |
1626 | ||
1627 | return 0; | |
1628 | } | |
1629 | ||
6bf5e0ba | 1630 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1631 | static int |
d50171e4 | 1632 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1633 | { |
d86d4aaf | 1634 | struct thread_info *thread = (struct thread_info *) entry; |
582511be | 1635 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1636 | ptid_t ptid = * (ptid_t *) arg; |
1637 | ||
1638 | /* Check if we're only interested in events from a specific process | |
afa8d396 PA |
1639 | or a specific LWP. */ |
1640 | if (!ptid_match (ptid_of (thread), ptid)) | |
95954743 | 1641 | return 0; |
0d62e5e8 | 1642 | |
a681f9c9 PA |
1643 | if (!lwp_resumed (lp)) |
1644 | return 0; | |
1645 | ||
582511be PA |
1646 | if (lp->status_pending_p |
1647 | && !thread_still_has_status_pending_p (thread)) | |
1648 | { | |
1649 | linux_resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); | |
1650 | return 0; | |
1651 | } | |
0d62e5e8 | 1652 | |
582511be | 1653 | return lp->status_pending_p; |
0d62e5e8 DJ |
1654 | } |
1655 | ||
95954743 PA |
1656 | static int |
1657 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1658 | { | |
1659 | ptid_t ptid = *(ptid_t *) data; | |
1660 | int lwp; | |
1661 | ||
1662 | if (ptid_get_lwp (ptid) != 0) | |
1663 | lwp = ptid_get_lwp (ptid); | |
1664 | else | |
1665 | lwp = ptid_get_pid (ptid); | |
1666 | ||
1667 | if (ptid_get_lwp (entry->id) == lwp) | |
1668 | return 1; | |
1669 | ||
1670 | return 0; | |
1671 | } | |
1672 | ||
1673 | struct lwp_info * | |
1674 | find_lwp_pid (ptid_t ptid) | |
1675 | { | |
d86d4aaf DE |
1676 | struct inferior_list_entry *thread |
1677 | = find_inferior (&all_threads, same_lwp, &ptid); | |
1678 | ||
1679 | if (thread == NULL) | |
1680 | return NULL; | |
1681 | ||
1682 | return get_thread_lwp ((struct thread_info *) thread); | |
95954743 PA |
1683 | } |
1684 | ||
fa96cb38 | 1685 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1686 | |
fa96cb38 PA |
1687 | static int |
1688 | num_lwps (int pid) | |
1689 | { | |
1690 | struct inferior_list_entry *inf, *tmp; | |
1691 | int count = 0; | |
0d62e5e8 | 1692 | |
fa96cb38 | 1693 | ALL_INFERIORS (&all_threads, inf, tmp) |
24a09b5f | 1694 | { |
fa96cb38 PA |
1695 | if (ptid_get_pid (inf->id) == pid) |
1696 | count++; | |
24a09b5f | 1697 | } |
3aee8918 | 1698 | |
fa96cb38 PA |
1699 | return count; |
1700 | } | |
d61ddec4 | 1701 | |
6d4ee8c6 GB |
1702 | /* The arguments passed to iterate_over_lwps. */ |
1703 | ||
1704 | struct iterate_over_lwps_args | |
1705 | { | |
1706 | /* The FILTER argument passed to iterate_over_lwps. */ | |
1707 | ptid_t filter; | |
1708 | ||
1709 | /* The CALLBACK argument passed to iterate_over_lwps. */ | |
1710 | iterate_over_lwps_ftype *callback; | |
1711 | ||
1712 | /* The DATA argument passed to iterate_over_lwps. */ | |
1713 | void *data; | |
1714 | }; | |
1715 | ||
1716 | /* Callback for find_inferior used by iterate_over_lwps to filter | |
1717 | calls to the callback supplied to that function. Returning a | |
1718 | nonzero value causes find_inferiors to stop iterating and return | |
1719 | the current inferior_list_entry. Returning zero indicates that | |
1720 | find_inferiors should continue iterating. */ | |
1721 | ||
1722 | static int | |
1723 | iterate_over_lwps_filter (struct inferior_list_entry *entry, void *args_p) | |
1724 | { | |
1725 | struct iterate_over_lwps_args *args | |
1726 | = (struct iterate_over_lwps_args *) args_p; | |
1727 | ||
1728 | if (ptid_match (entry->id, args->filter)) | |
1729 | { | |
1730 | struct thread_info *thr = (struct thread_info *) entry; | |
1731 | struct lwp_info *lwp = get_thread_lwp (thr); | |
1732 | ||
1733 | return (*args->callback) (lwp, args->data); | |
1734 | } | |
1735 | ||
1736 | return 0; | |
1737 | } | |
1738 | ||
1739 | /* See nat/linux-nat.h. */ | |
1740 | ||
1741 | struct lwp_info * | |
1742 | iterate_over_lwps (ptid_t filter, | |
1743 | iterate_over_lwps_ftype callback, | |
1744 | void *data) | |
1745 | { | |
1746 | struct iterate_over_lwps_args args = {filter, callback, data}; | |
1747 | struct inferior_list_entry *entry; | |
1748 | ||
1749 | entry = find_inferior (&all_threads, iterate_over_lwps_filter, &args); | |
1750 | if (entry == NULL) | |
1751 | return NULL; | |
1752 | ||
1753 | return get_thread_lwp ((struct thread_info *) entry); | |
1754 | } | |
1755 | ||
fa96cb38 PA |
1756 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1757 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1758 | |
fa96cb38 PA |
1759 | static void |
1760 | check_zombie_leaders (void) | |
1761 | { | |
1762 | struct process_info *proc, *tmp; | |
c3adc08c | 1763 | |
fa96cb38 | 1764 | ALL_PROCESSES (proc, tmp) |
c3adc08c | 1765 | { |
fa96cb38 PA |
1766 | pid_t leader_pid = pid_of (proc); |
1767 | struct lwp_info *leader_lp; | |
c3adc08c | 1768 | |
fa96cb38 | 1769 | leader_lp = find_lwp_pid (pid_to_ptid (leader_pid)); |
c3adc08c | 1770 | |
fa96cb38 PA |
1771 | if (debug_threads) |
1772 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1773 | "num_lwps=%d, zombie=%d\n", | |
1774 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1775 | linux_proc_pid_is_zombie (leader_pid)); | |
1776 | ||
94585166 | 1777 | if (leader_lp != NULL && !leader_lp->stopped |
fa96cb38 PA |
1778 | /* Check if there are other threads in the group, as we may |
1779 | have raced with the inferior simply exiting. */ | |
1780 | && !last_thread_of_process_p (leader_pid) | |
1781 | && linux_proc_pid_is_zombie (leader_pid)) | |
1782 | { | |
1783 | /* A leader zombie can mean one of two things: | |
1784 | ||
1785 | - It exited, and there's an exit status pending | |
1786 | available, or only the leader exited (not the whole | |
1787 | program). In the latter case, we can't waitpid the | |
1788 | leader's exit status until all other threads are gone. | |
1789 | ||
1790 | - There are 3 or more threads in the group, and a thread | |
1791 | other than the leader exec'd. On an exec, the Linux | |
1792 | kernel destroys all other threads (except the execing | |
1793 | one) in the thread group, and resets the execing thread's | |
1794 | tid to the tgid. No exit notification is sent for the | |
1795 | execing thread -- from the ptracer's perspective, it | |
1796 | appears as though the execing thread just vanishes. | |
1797 | Until we reap all other threads except the leader and the | |
1798 | execing thread, the leader will be zombie, and the | |
1799 | execing thread will be in `D (disc sleep)'. As soon as | |
1800 | all other threads are reaped, the execing thread changes | |
1801 | it's tid to the tgid, and the previous (zombie) leader | |
1802 | vanishes, giving place to the "new" leader. We could try | |
1803 | distinguishing the exit and exec cases, by waiting once | |
1804 | more, and seeing if something comes out, but it doesn't | |
1805 | sound useful. The previous leader _does_ go away, and | |
1806 | we'll re-add the new one once we see the exec event | |
1807 | (which is just the same as what would happen if the | |
1808 | previous leader did exit voluntarily before some other | |
1809 | thread execs). */ | |
c3adc08c | 1810 | |
fa96cb38 PA |
1811 | if (debug_threads) |
1812 | fprintf (stderr, | |
1813 | "CZL: Thread group leader %d zombie " | |
1814 | "(it exited, or another thread execd).\n", | |
1815 | leader_pid); | |
c3adc08c | 1816 | |
fa96cb38 | 1817 | delete_lwp (leader_lp); |
c3adc08c PA |
1818 | } |
1819 | } | |
fa96cb38 | 1820 | } |
c3adc08c | 1821 | |
fa96cb38 PA |
1822 | /* Callback for `find_inferior'. Returns the first LWP that is not |
1823 | stopped. ARG is a PTID filter. */ | |
d50171e4 | 1824 | |
fa96cb38 PA |
1825 | static int |
1826 | not_stopped_callback (struct inferior_list_entry *entry, void *arg) | |
1827 | { | |
1828 | struct thread_info *thr = (struct thread_info *) entry; | |
1829 | struct lwp_info *lwp; | |
1830 | ptid_t filter = *(ptid_t *) arg; | |
47c0c975 | 1831 | |
fa96cb38 PA |
1832 | if (!ptid_match (ptid_of (thr), filter)) |
1833 | return 0; | |
bd99dc85 | 1834 | |
fa96cb38 PA |
1835 | lwp = get_thread_lwp (thr); |
1836 | if (!lwp->stopped) | |
1837 | return 1; | |
1838 | ||
1839 | return 0; | |
0d62e5e8 | 1840 | } |
611cb4a5 | 1841 | |
863d01bd PA |
1842 | /* Increment LWP's suspend count. */ |
1843 | ||
1844 | static void | |
1845 | lwp_suspended_inc (struct lwp_info *lwp) | |
1846 | { | |
1847 | lwp->suspended++; | |
1848 | ||
1849 | if (debug_threads && lwp->suspended > 4) | |
1850 | { | |
1851 | struct thread_info *thread = get_lwp_thread (lwp); | |
1852 | ||
1853 | debug_printf ("LWP %ld has a suspiciously high suspend count," | |
1854 | " suspended=%d\n", lwpid_of (thread), lwp->suspended); | |
1855 | } | |
1856 | } | |
1857 | ||
1858 | /* Decrement LWP's suspend count. */ | |
1859 | ||
1860 | static void | |
1861 | lwp_suspended_decr (struct lwp_info *lwp) | |
1862 | { | |
1863 | lwp->suspended--; | |
1864 | ||
1865 | if (lwp->suspended < 0) | |
1866 | { | |
1867 | struct thread_info *thread = get_lwp_thread (lwp); | |
1868 | ||
1869 | internal_error (__FILE__, __LINE__, | |
1870 | "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread), | |
1871 | lwp->suspended); | |
1872 | } | |
1873 | } | |
1874 | ||
219f2f23 PA |
1875 | /* This function should only be called if the LWP got a SIGTRAP. |
1876 | ||
1877 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1878 | event was handled, 0 otherwise. */ | |
1879 | ||
1880 | static int | |
1881 | handle_tracepoints (struct lwp_info *lwp) | |
1882 | { | |
1883 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1884 | int tpoint_related_event = 0; | |
1885 | ||
582511be PA |
1886 | gdb_assert (lwp->suspended == 0); |
1887 | ||
7984d532 PA |
1888 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1889 | uninsert tracepoints. To do this, we temporarily pause all | |
1890 | threads, unpatch away, and then unpause threads. We need to make | |
1891 | sure the unpausing doesn't resume LWP too. */ | |
863d01bd | 1892 | lwp_suspended_inc (lwp); |
7984d532 | 1893 | |
219f2f23 PA |
1894 | /* And we need to be sure that any all-threads-stopping doesn't try |
1895 | to move threads out of the jump pads, as it could deadlock the | |
1896 | inferior (LWP could be in the jump pad, maybe even holding the | |
1897 | lock.) */ | |
1898 | ||
1899 | /* Do any necessary step collect actions. */ | |
1900 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1901 | ||
fa593d66 PA |
1902 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1903 | ||
219f2f23 PA |
1904 | /* See if we just hit a tracepoint and do its main collect |
1905 | actions. */ | |
1906 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1907 | ||
863d01bd | 1908 | lwp_suspended_decr (lwp); |
7984d532 PA |
1909 | |
1910 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1911 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1912 | |
219f2f23 PA |
1913 | if (tpoint_related_event) |
1914 | { | |
1915 | if (debug_threads) | |
87ce2a04 | 1916 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1917 | return 1; |
1918 | } | |
1919 | ||
1920 | return 0; | |
1921 | } | |
1922 | ||
fa593d66 PA |
1923 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1924 | fast tracepoint. */ | |
1925 | ||
1926 | static int | |
1927 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1928 | struct fast_tpoint_collect_status *status) | |
1929 | { | |
1930 | CORE_ADDR thread_area; | |
d86d4aaf | 1931 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1932 | |
1933 | if (the_low_target.get_thread_area == NULL) | |
1934 | return 0; | |
1935 | ||
1936 | /* Get the thread area address. This is used to recognize which | |
1937 | thread is which when tracing with the in-process agent library. | |
1938 | We don't read anything from the address, and treat it as opaque; | |
1939 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 1940 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
fa593d66 PA |
1941 | return 0; |
1942 | ||
1943 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1944 | } | |
1945 | ||
1946 | /* The reason we resume in the caller, is because we want to be able | |
1947 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1948 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1949 | refuses to resume. */ | |
1950 | ||
1951 | static int | |
1952 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1953 | { | |
0bfdf32f | 1954 | struct thread_info *saved_thread; |
fa593d66 | 1955 | |
0bfdf32f GB |
1956 | saved_thread = current_thread; |
1957 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
1958 | |
1959 | if ((wstat == NULL | |
1960 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1961 | && supports_fast_tracepoints () | |
58b4daa5 | 1962 | && agent_loaded_p ()) |
fa593d66 PA |
1963 | { |
1964 | struct fast_tpoint_collect_status status; | |
1965 | int r; | |
1966 | ||
1967 | if (debug_threads) | |
87ce2a04 DE |
1968 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1969 | "jump pad.\n", | |
0bfdf32f | 1970 | lwpid_of (current_thread)); |
fa593d66 PA |
1971 | |
1972 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1973 | ||
1974 | if (wstat == NULL | |
1975 | || (WSTOPSIG (*wstat) != SIGILL | |
1976 | && WSTOPSIG (*wstat) != SIGFPE | |
1977 | && WSTOPSIG (*wstat) != SIGSEGV | |
1978 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1979 | { | |
1980 | lwp->collecting_fast_tracepoint = r; | |
1981 | ||
1982 | if (r != 0) | |
1983 | { | |
1984 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1985 | { | |
1986 | /* Haven't executed the original instruction yet. | |
1987 | Set breakpoint there, and wait till it's hit, | |
1988 | then single-step until exiting the jump pad. */ | |
1989 | lwp->exit_jump_pad_bkpt | |
1990 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1991 | } | |
1992 | ||
1993 | if (debug_threads) | |
87ce2a04 DE |
1994 | debug_printf ("Checking whether LWP %ld needs to move out of " |
1995 | "the jump pad...it does\n", | |
0bfdf32f GB |
1996 | lwpid_of (current_thread)); |
1997 | current_thread = saved_thread; | |
fa593d66 PA |
1998 | |
1999 | return 1; | |
2000 | } | |
2001 | } | |
2002 | else | |
2003 | { | |
2004 | /* If we get a synchronous signal while collecting, *and* | |
2005 | while executing the (relocated) original instruction, | |
2006 | reset the PC to point at the tpoint address, before | |
2007 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
2008 | report the signal to GDB, and pray for the best. */ | |
2009 | ||
2010 | lwp->collecting_fast_tracepoint = 0; | |
2011 | ||
2012 | if (r != 0 | |
2013 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
2014 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
2015 | { | |
2016 | siginfo_t info; | |
2017 | struct regcache *regcache; | |
2018 | ||
2019 | /* The si_addr on a few signals references the address | |
2020 | of the faulting instruction. Adjust that as | |
2021 | well. */ | |
2022 | if ((WSTOPSIG (*wstat) == SIGILL | |
2023 | || WSTOPSIG (*wstat) == SIGFPE | |
2024 | || WSTOPSIG (*wstat) == SIGBUS | |
2025 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 2026 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2027 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
2028 | /* Final check just to make sure we don't clobber |
2029 | the siginfo of non-kernel-sent signals. */ | |
2030 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
2031 | { | |
2032 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 2033 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2034 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
2035 | } |
2036 | ||
0bfdf32f | 2037 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
2038 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
2039 | lwp->stop_pc = status.tpoint_addr; | |
2040 | ||
2041 | /* Cancel any fast tracepoint lock this thread was | |
2042 | holding. */ | |
2043 | force_unlock_trace_buffer (); | |
2044 | } | |
2045 | ||
2046 | if (lwp->exit_jump_pad_bkpt != NULL) | |
2047 | { | |
2048 | if (debug_threads) | |
87ce2a04 DE |
2049 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
2050 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2051 | |
2052 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
2053 | |
2054 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
2055 | lwp->exit_jump_pad_bkpt = NULL; | |
2056 | ||
2057 | unstop_all_lwps (1, lwp); | |
2058 | ||
2059 | gdb_assert (lwp->suspended >= 0); | |
2060 | } | |
2061 | } | |
2062 | } | |
2063 | ||
2064 | if (debug_threads) | |
87ce2a04 DE |
2065 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2066 | "jump pad...no\n", | |
0bfdf32f | 2067 | lwpid_of (current_thread)); |
0cccb683 | 2068 | |
0bfdf32f | 2069 | current_thread = saved_thread; |
fa593d66 PA |
2070 | return 0; |
2071 | } | |
2072 | ||
2073 | /* Enqueue one signal in the "signals to report later when out of the | |
2074 | jump pad" list. */ | |
2075 | ||
2076 | static void | |
2077 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2078 | { | |
2079 | struct pending_signals *p_sig; | |
d86d4aaf | 2080 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2081 | |
2082 | if (debug_threads) | |
87ce2a04 | 2083 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 2084 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2085 | |
2086 | if (debug_threads) | |
2087 | { | |
2088 | struct pending_signals *sig; | |
2089 | ||
2090 | for (sig = lwp->pending_signals_to_report; | |
2091 | sig != NULL; | |
2092 | sig = sig->prev) | |
87ce2a04 DE |
2093 | debug_printf (" Already queued %d\n", |
2094 | sig->signal); | |
fa593d66 | 2095 | |
87ce2a04 | 2096 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
2097 | } |
2098 | ||
1a981360 PA |
2099 | /* Don't enqueue non-RT signals if they are already in the deferred |
2100 | queue. (SIGSTOP being the easiest signal to see ending up here | |
2101 | twice) */ | |
2102 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
2103 | { | |
2104 | struct pending_signals *sig; | |
2105 | ||
2106 | for (sig = lwp->pending_signals_to_report; | |
2107 | sig != NULL; | |
2108 | sig = sig->prev) | |
2109 | { | |
2110 | if (sig->signal == WSTOPSIG (*wstat)) | |
2111 | { | |
2112 | if (debug_threads) | |
87ce2a04 DE |
2113 | debug_printf ("Not requeuing already queued non-RT signal %d" |
2114 | " for LWP %ld\n", | |
2115 | sig->signal, | |
d86d4aaf | 2116 | lwpid_of (thread)); |
1a981360 PA |
2117 | return; |
2118 | } | |
2119 | } | |
2120 | } | |
2121 | ||
8d749320 | 2122 | p_sig = XCNEW (struct pending_signals); |
fa593d66 PA |
2123 | p_sig->prev = lwp->pending_signals_to_report; |
2124 | p_sig->signal = WSTOPSIG (*wstat); | |
8d749320 | 2125 | |
d86d4aaf | 2126 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2127 | &p_sig->info); |
fa593d66 PA |
2128 | |
2129 | lwp->pending_signals_to_report = p_sig; | |
2130 | } | |
2131 | ||
2132 | /* Dequeue one signal from the "signals to report later when out of | |
2133 | the jump pad" list. */ | |
2134 | ||
2135 | static int | |
2136 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2137 | { | |
d86d4aaf DE |
2138 | struct thread_info *thread = get_lwp_thread (lwp); |
2139 | ||
fa593d66 PA |
2140 | if (lwp->pending_signals_to_report != NULL) |
2141 | { | |
2142 | struct pending_signals **p_sig; | |
2143 | ||
2144 | p_sig = &lwp->pending_signals_to_report; | |
2145 | while ((*p_sig)->prev != NULL) | |
2146 | p_sig = &(*p_sig)->prev; | |
2147 | ||
2148 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
2149 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 2150 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2151 | &(*p_sig)->info); |
fa593d66 PA |
2152 | free (*p_sig); |
2153 | *p_sig = NULL; | |
2154 | ||
2155 | if (debug_threads) | |
87ce2a04 | 2156 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 2157 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2158 | |
2159 | if (debug_threads) | |
2160 | { | |
2161 | struct pending_signals *sig; | |
2162 | ||
2163 | for (sig = lwp->pending_signals_to_report; | |
2164 | sig != NULL; | |
2165 | sig = sig->prev) | |
87ce2a04 DE |
2166 | debug_printf (" Still queued %d\n", |
2167 | sig->signal); | |
fa593d66 | 2168 | |
87ce2a04 | 2169 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
2170 | } |
2171 | ||
2172 | return 1; | |
2173 | } | |
2174 | ||
2175 | return 0; | |
2176 | } | |
2177 | ||
582511be PA |
2178 | /* Fetch the possibly triggered data watchpoint info and store it in |
2179 | CHILD. | |
d50171e4 | 2180 | |
582511be PA |
2181 | On some archs, like x86, that use debug registers to set |
2182 | watchpoints, it's possible that the way to know which watched | |
2183 | address trapped, is to check the register that is used to select | |
2184 | which address to watch. Problem is, between setting the watchpoint | |
2185 | and reading back which data address trapped, the user may change | |
2186 | the set of watchpoints, and, as a consequence, GDB changes the | |
2187 | debug registers in the inferior. To avoid reading back a stale | |
2188 | stopped-data-address when that happens, we cache in LP the fact | |
2189 | that a watchpoint trapped, and the corresponding data address, as | |
2190 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
2191 | registers meanwhile, we have the cached data we can rely on. */ | |
d50171e4 | 2192 | |
582511be PA |
2193 | static int |
2194 | check_stopped_by_watchpoint (struct lwp_info *child) | |
2195 | { | |
2196 | if (the_low_target.stopped_by_watchpoint != NULL) | |
d50171e4 | 2197 | { |
582511be | 2198 | struct thread_info *saved_thread; |
d50171e4 | 2199 | |
582511be PA |
2200 | saved_thread = current_thread; |
2201 | current_thread = get_lwp_thread (child); | |
2202 | ||
2203 | if (the_low_target.stopped_by_watchpoint ()) | |
d50171e4 | 2204 | { |
15c66dd6 | 2205 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; |
582511be PA |
2206 | |
2207 | if (the_low_target.stopped_data_address != NULL) | |
2208 | child->stopped_data_address | |
2209 | = the_low_target.stopped_data_address (); | |
2210 | else | |
2211 | child->stopped_data_address = 0; | |
d50171e4 PA |
2212 | } |
2213 | ||
0bfdf32f | 2214 | current_thread = saved_thread; |
d50171e4 PA |
2215 | } |
2216 | ||
15c66dd6 | 2217 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
c4d9ceb6 YQ |
2218 | } |
2219 | ||
de0d863e DB |
2220 | /* Return the ptrace options that we want to try to enable. */ |
2221 | ||
2222 | static int | |
2223 | linux_low_ptrace_options (int attached) | |
2224 | { | |
2225 | int options = 0; | |
2226 | ||
2227 | if (!attached) | |
2228 | options |= PTRACE_O_EXITKILL; | |
2229 | ||
2230 | if (report_fork_events) | |
2231 | options |= PTRACE_O_TRACEFORK; | |
2232 | ||
c269dbdb DB |
2233 | if (report_vfork_events) |
2234 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); | |
2235 | ||
94585166 DB |
2236 | if (report_exec_events) |
2237 | options |= PTRACE_O_TRACEEXEC; | |
2238 | ||
de0d863e DB |
2239 | return options; |
2240 | } | |
2241 | ||
fa96cb38 PA |
2242 | /* Do low-level handling of the event, and check if we should go on |
2243 | and pass it to caller code. Return the affected lwp if we are, or | |
2244 | NULL otherwise. */ | |
2245 | ||
2246 | static struct lwp_info * | |
582511be | 2247 | linux_low_filter_event (int lwpid, int wstat) |
fa96cb38 PA |
2248 | { |
2249 | struct lwp_info *child; | |
2250 | struct thread_info *thread; | |
582511be | 2251 | int have_stop_pc = 0; |
fa96cb38 PA |
2252 | |
2253 | child = find_lwp_pid (pid_to_ptid (lwpid)); | |
2254 | ||
94585166 DB |
2255 | /* Check for stop events reported by a process we didn't already |
2256 | know about - anything not already in our LWP list. | |
2257 | ||
2258 | If we're expecting to receive stopped processes after | |
2259 | fork, vfork, and clone events, then we'll just add the | |
2260 | new one to our list and go back to waiting for the event | |
2261 | to be reported - the stopped process might be returned | |
2262 | from waitpid before or after the event is. | |
2263 | ||
2264 | But note the case of a non-leader thread exec'ing after the | |
2265 | leader having exited, and gone from our lists (because | |
2266 | check_zombie_leaders deleted it). The non-leader thread | |
2267 | changes its tid to the tgid. */ | |
2268 | ||
2269 | if (WIFSTOPPED (wstat) && child == NULL && WSTOPSIG (wstat) == SIGTRAP | |
2270 | && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC) | |
2271 | { | |
2272 | ptid_t child_ptid; | |
2273 | ||
2274 | /* A multi-thread exec after we had seen the leader exiting. */ | |
2275 | if (debug_threads) | |
2276 | { | |
2277 | debug_printf ("LLW: Re-adding thread group leader LWP %d" | |
2278 | "after exec.\n", lwpid); | |
2279 | } | |
2280 | ||
2281 | child_ptid = ptid_build (lwpid, lwpid, 0); | |
2282 | child = add_lwp (child_ptid); | |
2283 | child->stopped = 1; | |
2284 | current_thread = child->thread; | |
2285 | } | |
2286 | ||
fa96cb38 PA |
2287 | /* If we didn't find a process, one of two things presumably happened: |
2288 | - A process we started and then detached from has exited. Ignore it. | |
2289 | - A process we are controlling has forked and the new child's stop | |
2290 | was reported to us by the kernel. Save its PID. */ | |
2291 | if (child == NULL && WIFSTOPPED (wstat)) | |
2292 | { | |
2293 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2294 | return NULL; | |
2295 | } | |
2296 | else if (child == NULL) | |
2297 | return NULL; | |
2298 | ||
2299 | thread = get_lwp_thread (child); | |
2300 | ||
2301 | child->stopped = 1; | |
2302 | ||
2303 | child->last_status = wstat; | |
2304 | ||
582511be PA |
2305 | /* Check if the thread has exited. */ |
2306 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2307 | { | |
2308 | if (debug_threads) | |
2309 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
65706a29 PA |
2310 | /* If there is at least one more LWP, then the exit signal was |
2311 | not the end of the debugged application and should be | |
2312 | ignored, unless GDB wants to hear about thread exits. */ | |
2313 | if (report_thread_events | |
2314 | || last_thread_of_process_p (pid_of (thread))) | |
582511be | 2315 | { |
65706a29 PA |
2316 | /* Since events are serialized to GDB core, and we can't |
2317 | report this one right now. Leave the status pending for | |
2318 | the next time we're able to report it. */ | |
2319 | mark_lwp_dead (child, wstat); | |
2320 | return child; | |
582511be PA |
2321 | } |
2322 | else | |
2323 | { | |
65706a29 PA |
2324 | delete_lwp (child); |
2325 | return NULL; | |
582511be PA |
2326 | } |
2327 | } | |
2328 | ||
2329 | gdb_assert (WIFSTOPPED (wstat)); | |
2330 | ||
fa96cb38 PA |
2331 | if (WIFSTOPPED (wstat)) |
2332 | { | |
2333 | struct process_info *proc; | |
2334 | ||
c06cbd92 | 2335 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2336 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2337 | if (proc->tdesc == NULL) |
fa96cb38 | 2338 | { |
c06cbd92 YQ |
2339 | if (proc->attached) |
2340 | { | |
c06cbd92 YQ |
2341 | /* This needs to happen after we have attached to the |
2342 | inferior and it is stopped for the first time, but | |
2343 | before we access any inferior registers. */ | |
94585166 | 2344 | linux_arch_setup_thread (thread); |
c06cbd92 YQ |
2345 | } |
2346 | else | |
2347 | { | |
2348 | /* The process is started, but GDBserver will do | |
2349 | architecture-specific setup after the program stops at | |
2350 | the first instruction. */ | |
2351 | child->status_pending_p = 1; | |
2352 | child->status_pending = wstat; | |
2353 | return child; | |
2354 | } | |
fa96cb38 PA |
2355 | } |
2356 | } | |
2357 | ||
fa96cb38 PA |
2358 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2359 | { | |
beed38b8 | 2360 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2361 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2362 | |
de0d863e | 2363 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2364 | child->must_set_ptrace_flags = 0; |
2365 | } | |
2366 | ||
582511be PA |
2367 | /* Be careful to not overwrite stop_pc until |
2368 | check_stopped_by_breakpoint is called. */ | |
fa96cb38 | 2369 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2370 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2371 | { |
582511be | 2372 | child->stop_pc = get_pc (child); |
94585166 | 2373 | if (handle_extended_wait (&child, wstat)) |
de0d863e DB |
2374 | { |
2375 | /* The event has been handled, so just return without | |
2376 | reporting it. */ | |
2377 | return NULL; | |
2378 | } | |
fa96cb38 PA |
2379 | } |
2380 | ||
3e572f71 PA |
2381 | /* Check first whether this was a SW/HW breakpoint before checking |
2382 | watchpoints, because at least s390 can't tell the data address of | |
2383 | hardware watchpoint hits, and returns stopped-by-watchpoint as | |
2384 | long as there's a watchpoint set. */ | |
2385 | if (WIFSTOPPED (wstat) && linux_wstatus_maybe_breakpoint (wstat)) | |
582511be PA |
2386 | { |
2387 | if (check_stopped_by_breakpoint (child)) | |
2388 | have_stop_pc = 1; | |
2389 | } | |
2390 | ||
3e572f71 PA |
2391 | /* Note that TRAP_HWBKPT can indicate either a hardware breakpoint |
2392 | or hardware watchpoint. Check which is which if we got | |
863d01bd PA |
2393 | TARGET_STOPPED_BY_HW_BREAKPOINT. Likewise, we may have single |
2394 | stepped an instruction that triggered a watchpoint. In that | |
2395 | case, on some architectures (such as x86), instead of | |
2396 | TRAP_HWBKPT, si_code indicates TRAP_TRACE, and we need to check | |
2397 | the debug registers separately. */ | |
3e572f71 | 2398 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
863d01bd | 2399 | && child->stop_reason != TARGET_STOPPED_BY_SW_BREAKPOINT) |
3e572f71 PA |
2400 | check_stopped_by_watchpoint (child); |
2401 | ||
582511be PA |
2402 | if (!have_stop_pc) |
2403 | child->stop_pc = get_pc (child); | |
2404 | ||
fa96cb38 PA |
2405 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2406 | && child->stop_expected) | |
2407 | { | |
2408 | if (debug_threads) | |
2409 | debug_printf ("Expected stop.\n"); | |
2410 | child->stop_expected = 0; | |
2411 | ||
2412 | if (thread->last_resume_kind == resume_stop) | |
2413 | { | |
2414 | /* We want to report the stop to the core. Treat the | |
2415 | SIGSTOP as a normal event. */ | |
2bf6fb9d PA |
2416 | if (debug_threads) |
2417 | debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n", | |
2418 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2419 | } |
2420 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2421 | { | |
2422 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2423 | pending. */ |
2bf6fb9d PA |
2424 | if (debug_threads) |
2425 | debug_printf ("LLW: SIGSTOP caught for %s " | |
2426 | "while stopping threads.\n", | |
2427 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2428 | return NULL; |
2429 | } | |
2430 | else | |
2431 | { | |
2bf6fb9d PA |
2432 | /* This is a delayed SIGSTOP. Filter out the event. */ |
2433 | if (debug_threads) | |
2434 | debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", | |
2435 | child->stepping ? "step" : "continue", | |
2436 | target_pid_to_str (ptid_of (thread))); | |
2437 | ||
fa96cb38 PA |
2438 | linux_resume_one_lwp (child, child->stepping, 0, NULL); |
2439 | return NULL; | |
2440 | } | |
2441 | } | |
2442 | ||
582511be PA |
2443 | child->status_pending_p = 1; |
2444 | child->status_pending = wstat; | |
fa96cb38 PA |
2445 | return child; |
2446 | } | |
2447 | ||
20ba1ce6 PA |
2448 | /* Resume LWPs that are currently stopped without any pending status |
2449 | to report, but are resumed from the core's perspective. */ | |
2450 | ||
2451 | static void | |
2452 | resume_stopped_resumed_lwps (struct inferior_list_entry *entry) | |
2453 | { | |
2454 | struct thread_info *thread = (struct thread_info *) entry; | |
2455 | struct lwp_info *lp = get_thread_lwp (thread); | |
2456 | ||
2457 | if (lp->stopped | |
863d01bd | 2458 | && !lp->suspended |
20ba1ce6 | 2459 | && !lp->status_pending_p |
20ba1ce6 PA |
2460 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) |
2461 | { | |
2462 | int step = thread->last_resume_kind == resume_step; | |
2463 | ||
2464 | if (debug_threads) | |
2465 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2466 | target_pid_to_str (ptid_of (thread)), | |
2467 | paddress (lp->stop_pc), | |
2468 | step); | |
2469 | ||
2470 | linux_resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); | |
2471 | } | |
2472 | } | |
2473 | ||
fa96cb38 PA |
2474 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
2475 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
2476 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2477 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2478 | the stop status through the status pointer WSTAT. OPTIONS is | |
2479 | passed to the waitpid call. Return 0 if no event was found and | |
2480 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2481 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 2482 | |
0d62e5e8 | 2483 | static int |
fa96cb38 PA |
2484 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
2485 | int *wstatp, int options) | |
0d62e5e8 | 2486 | { |
d86d4aaf | 2487 | struct thread_info *event_thread; |
d50171e4 | 2488 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2489 | sigset_t block_mask, prev_mask; |
d50171e4 | 2490 | |
fa96cb38 | 2491 | retry: |
d86d4aaf DE |
2492 | /* N.B. event_thread points to the thread_info struct that contains |
2493 | event_child. Keep them in sync. */ | |
2494 | event_thread = NULL; | |
d50171e4 PA |
2495 | event_child = NULL; |
2496 | requested_child = NULL; | |
0d62e5e8 | 2497 | |
95954743 | 2498 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2499 | |
fa96cb38 | 2500 | if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid)) |
0d62e5e8 | 2501 | { |
d86d4aaf | 2502 | event_thread = (struct thread_info *) |
fa96cb38 | 2503 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); |
d86d4aaf DE |
2504 | if (event_thread != NULL) |
2505 | event_child = get_thread_lwp (event_thread); | |
2506 | if (debug_threads && event_thread) | |
2507 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2508 | } |
fa96cb38 | 2509 | else if (!ptid_equal (filter_ptid, null_ptid)) |
0d62e5e8 | 2510 | { |
fa96cb38 | 2511 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2512 | |
bde24c0a | 2513 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
2514 | && requested_child->status_pending_p |
2515 | && requested_child->collecting_fast_tracepoint) | |
2516 | { | |
2517 | enqueue_one_deferred_signal (requested_child, | |
2518 | &requested_child->status_pending); | |
2519 | requested_child->status_pending_p = 0; | |
2520 | requested_child->status_pending = 0; | |
2521 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2522 | } | |
2523 | ||
2524 | if (requested_child->suspended | |
2525 | && requested_child->status_pending_p) | |
38e08fca GB |
2526 | { |
2527 | internal_error (__FILE__, __LINE__, | |
2528 | "requesting an event out of a" | |
2529 | " suspended child?"); | |
2530 | } | |
fa593d66 | 2531 | |
d50171e4 | 2532 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2533 | { |
2534 | event_child = requested_child; | |
2535 | event_thread = get_lwp_thread (event_child); | |
2536 | } | |
0d62e5e8 | 2537 | } |
611cb4a5 | 2538 | |
0d62e5e8 DJ |
2539 | if (event_child != NULL) |
2540 | { | |
bd99dc85 | 2541 | if (debug_threads) |
87ce2a04 | 2542 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2543 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2544 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2545 | event_child->status_pending_p = 0; |
2546 | event_child->status_pending = 0; | |
0bfdf32f | 2547 | current_thread = event_thread; |
d86d4aaf | 2548 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2549 | } |
2550 | ||
fa96cb38 PA |
2551 | /* But if we don't find a pending event, we'll have to wait. |
2552 | ||
2553 | We only enter this loop if no process has a pending wait status. | |
2554 | Thus any action taken in response to a wait status inside this | |
2555 | loop is responding as soon as we detect the status, not after any | |
2556 | pending events. */ | |
d8301ad1 | 2557 | |
fa96cb38 PA |
2558 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2559 | all signals while here. */ | |
2560 | sigfillset (&block_mask); | |
2561 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2562 | ||
582511be PA |
2563 | /* Always pull all events out of the kernel. We'll randomly select |
2564 | an event LWP out of all that have events, to prevent | |
2565 | starvation. */ | |
fa96cb38 | 2566 | while (event_child == NULL) |
0d62e5e8 | 2567 | { |
fa96cb38 | 2568 | pid_t ret = 0; |
0d62e5e8 | 2569 | |
fa96cb38 PA |
2570 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2571 | quirks: | |
0d62e5e8 | 2572 | |
fa96cb38 PA |
2573 | - If the thread group leader exits while other threads in the |
2574 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2575 | waitpid won't return an exit status until the other threads | |
2576 | in the group are reaped. | |
611cb4a5 | 2577 | |
fa96cb38 PA |
2578 | - When a non-leader thread execs, that thread just vanishes |
2579 | without reporting an exit (so we'd hang if we waited for it | |
2580 | explicitly in that case). The exec event is reported to | |
94585166 | 2581 | the TGID pid. */ |
fa96cb38 PA |
2582 | errno = 0; |
2583 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2584 | |
fa96cb38 PA |
2585 | if (debug_threads) |
2586 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2587 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2588 | |
fa96cb38 | 2589 | if (ret > 0) |
0d62e5e8 | 2590 | { |
89be2091 | 2591 | if (debug_threads) |
bd99dc85 | 2592 | { |
fa96cb38 PA |
2593 | debug_printf ("LLW: waitpid %ld received %s\n", |
2594 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2595 | } |
89be2091 | 2596 | |
582511be PA |
2597 | /* Filter all events. IOW, leave all events pending. We'll |
2598 | randomly select an event LWP out of all that have events | |
2599 | below. */ | |
2600 | linux_low_filter_event (ret, *wstatp); | |
fa96cb38 PA |
2601 | /* Retry until nothing comes out of waitpid. A single |
2602 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2603 | continue; |
2604 | } | |
2605 | ||
20ba1ce6 PA |
2606 | /* Now that we've pulled all events out of the kernel, resume |
2607 | LWPs that don't have an interesting event to report. */ | |
2608 | if (stopping_threads == NOT_STOPPING_THREADS) | |
2609 | for_each_inferior (&all_threads, resume_stopped_resumed_lwps); | |
2610 | ||
2611 | /* ... and find an LWP with a status to report to the core, if | |
2612 | any. */ | |
582511be PA |
2613 | event_thread = (struct thread_info *) |
2614 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); | |
2615 | if (event_thread != NULL) | |
2616 | { | |
2617 | event_child = get_thread_lwp (event_thread); | |
2618 | *wstatp = event_child->status_pending; | |
2619 | event_child->status_pending_p = 0; | |
2620 | event_child->status_pending = 0; | |
2621 | break; | |
2622 | } | |
2623 | ||
fa96cb38 PA |
2624 | /* Check for zombie thread group leaders. Those can't be reaped |
2625 | until all other threads in the thread group are. */ | |
2626 | check_zombie_leaders (); | |
2627 | ||
2628 | /* If there are no resumed children left in the set of LWPs we | |
2629 | want to wait for, bail. We can't just block in | |
2630 | waitpid/sigsuspend, because lwps might have been left stopped | |
2631 | in trace-stop state, and we'd be stuck forever waiting for | |
2632 | their status to change (which would only happen if we resumed | |
2633 | them). Even if WNOHANG is set, this return code is preferred | |
2634 | over 0 (below), as it is more detailed. */ | |
2635 | if ((find_inferior (&all_threads, | |
2636 | not_stopped_callback, | |
2637 | &wait_ptid) == NULL)) | |
a6dbe5df | 2638 | { |
fa96cb38 PA |
2639 | if (debug_threads) |
2640 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2641 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2642 | return -1; | |
a6dbe5df PA |
2643 | } |
2644 | ||
fa96cb38 PA |
2645 | /* No interesting event to report to the caller. */ |
2646 | if ((options & WNOHANG)) | |
24a09b5f | 2647 | { |
fa96cb38 PA |
2648 | if (debug_threads) |
2649 | debug_printf ("WNOHANG set, no event found\n"); | |
2650 | ||
2651 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2652 | return 0; | |
24a09b5f DJ |
2653 | } |
2654 | ||
fa96cb38 PA |
2655 | /* Block until we get an event reported with SIGCHLD. */ |
2656 | if (debug_threads) | |
2657 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2658 | |
fa96cb38 PA |
2659 | sigsuspend (&prev_mask); |
2660 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2661 | goto retry; | |
2662 | } | |
d50171e4 | 2663 | |
fa96cb38 | 2664 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2665 | |
0bfdf32f | 2666 | current_thread = event_thread; |
d50171e4 | 2667 | |
fa96cb38 PA |
2668 | return lwpid_of (event_thread); |
2669 | } | |
2670 | ||
2671 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2672 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2673 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2674 | the stop status through the status pointer WSTAT. OPTIONS is | |
2675 | passed to the waitpid call. Return 0 if no event was found and | |
2676 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2677 | was found. Return the PID of the stopped child otherwise. */ | |
2678 | ||
2679 | static int | |
2680 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2681 | { | |
2682 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2683 | } |
2684 | ||
6bf5e0ba PA |
2685 | /* Count the LWP's that have had events. */ |
2686 | ||
2687 | static int | |
2688 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2689 | { | |
d86d4aaf | 2690 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2691 | struct lwp_info *lp = get_thread_lwp (thread); |
9a3c8263 | 2692 | int *count = (int *) data; |
6bf5e0ba PA |
2693 | |
2694 | gdb_assert (count != NULL); | |
2695 | ||
582511be | 2696 | /* Count only resumed LWPs that have an event pending. */ |
8336d594 | 2697 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2698 | && lp->status_pending_p) |
6bf5e0ba PA |
2699 | (*count)++; |
2700 | ||
2701 | return 0; | |
2702 | } | |
2703 | ||
2704 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2705 | ||
2706 | static int | |
2707 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2708 | { | |
d86d4aaf DE |
2709 | struct thread_info *thread = (struct thread_info *) entry; |
2710 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba | 2711 | |
8336d594 PA |
2712 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2713 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2714 | && lp->status_pending_p) |
2715 | return 1; | |
2716 | else | |
2717 | return 0; | |
2718 | } | |
2719 | ||
b90fc188 | 2720 | /* Select the Nth LWP that has had an event. */ |
6bf5e0ba PA |
2721 | |
2722 | static int | |
2723 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2724 | { | |
d86d4aaf | 2725 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2726 | struct lwp_info *lp = get_thread_lwp (thread); |
9a3c8263 | 2727 | int *selector = (int *) data; |
6bf5e0ba PA |
2728 | |
2729 | gdb_assert (selector != NULL); | |
2730 | ||
582511be | 2731 | /* Select only resumed LWPs that have an event pending. */ |
91baf43f | 2732 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2733 | && lp->status_pending_p) |
6bf5e0ba PA |
2734 | if ((*selector)-- == 0) |
2735 | return 1; | |
2736 | ||
2737 | return 0; | |
2738 | } | |
2739 | ||
6bf5e0ba PA |
2740 | /* Select one LWP out of those that have events pending. */ |
2741 | ||
2742 | static void | |
2743 | select_event_lwp (struct lwp_info **orig_lp) | |
2744 | { | |
2745 | int num_events = 0; | |
2746 | int random_selector; | |
582511be PA |
2747 | struct thread_info *event_thread = NULL; |
2748 | ||
2749 | /* In all-stop, give preference to the LWP that is being | |
2750 | single-stepped. There will be at most one, and it's the LWP that | |
2751 | the core is most interested in. If we didn't do this, then we'd | |
2752 | have to handle pending step SIGTRAPs somehow in case the core | |
2753 | later continues the previously-stepped thread, otherwise we'd | |
2754 | report the pending SIGTRAP, and the core, not having stepped the | |
2755 | thread, wouldn't understand what the trap was for, and therefore | |
2756 | would report it to the user as a random signal. */ | |
2757 | if (!non_stop) | |
6bf5e0ba | 2758 | { |
582511be PA |
2759 | event_thread |
2760 | = (struct thread_info *) find_inferior (&all_threads, | |
2761 | select_singlestep_lwp_callback, | |
2762 | NULL); | |
2763 | if (event_thread != NULL) | |
2764 | { | |
2765 | if (debug_threads) | |
2766 | debug_printf ("SEL: Select single-step %s\n", | |
2767 | target_pid_to_str (ptid_of (event_thread))); | |
2768 | } | |
6bf5e0ba | 2769 | } |
582511be | 2770 | if (event_thread == NULL) |
6bf5e0ba PA |
2771 | { |
2772 | /* No single-stepping LWP. Select one at random, out of those | |
b90fc188 | 2773 | which have had events. */ |
6bf5e0ba | 2774 | |
b90fc188 | 2775 | /* First see how many events we have. */ |
d86d4aaf | 2776 | find_inferior (&all_threads, count_events_callback, &num_events); |
8bf3b159 | 2777 | gdb_assert (num_events > 0); |
6bf5e0ba | 2778 | |
b90fc188 PA |
2779 | /* Now randomly pick a LWP out of those that have had |
2780 | events. */ | |
6bf5e0ba PA |
2781 | random_selector = (int) |
2782 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2783 | ||
2784 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2785 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2786 | num_events, random_selector); | |
6bf5e0ba | 2787 | |
d86d4aaf DE |
2788 | event_thread |
2789 | = (struct thread_info *) find_inferior (&all_threads, | |
2790 | select_event_lwp_callback, | |
2791 | &random_selector); | |
6bf5e0ba PA |
2792 | } |
2793 | ||
d86d4aaf | 2794 | if (event_thread != NULL) |
6bf5e0ba | 2795 | { |
d86d4aaf DE |
2796 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2797 | ||
6bf5e0ba PA |
2798 | /* Switch the event LWP. */ |
2799 | *orig_lp = event_lp; | |
2800 | } | |
2801 | } | |
2802 | ||
7984d532 PA |
2803 | /* Decrement the suspend count of an LWP. */ |
2804 | ||
2805 | static int | |
2806 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2807 | { | |
d86d4aaf DE |
2808 | struct thread_info *thread = (struct thread_info *) entry; |
2809 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
2810 | |
2811 | /* Ignore EXCEPT. */ | |
2812 | if (lwp == except) | |
2813 | return 0; | |
2814 | ||
863d01bd | 2815 | lwp_suspended_decr (lwp); |
7984d532 PA |
2816 | return 0; |
2817 | } | |
2818 | ||
2819 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2820 | NULL. */ | |
2821 | ||
2822 | static void | |
2823 | unsuspend_all_lwps (struct lwp_info *except) | |
2824 | { | |
d86d4aaf | 2825 | find_inferior (&all_threads, unsuspend_one_lwp, except); |
7984d532 PA |
2826 | } |
2827 | ||
fa593d66 PA |
2828 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2829 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2830 | void *data); | |
2831 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2832 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2833 | struct target_waitstatus *ourstatus, | |
2834 | int target_options); | |
2835 | ||
2836 | /* Stabilize threads (move out of jump pads). | |
2837 | ||
2838 | If a thread is midway collecting a fast tracepoint, we need to | |
2839 | finish the collection and move it out of the jump pad before | |
2840 | reporting the signal. | |
2841 | ||
2842 | This avoids recursion while collecting (when a signal arrives | |
2843 | midway, and the signal handler itself collects), which would trash | |
2844 | the trace buffer. In case the user set a breakpoint in a signal | |
2845 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2846 | Most importantly, there are certain things we can't do safely if | |
2847 | threads are stopped in a jump pad (or in its callee's). For | |
2848 | example: | |
2849 | ||
2850 | - starting a new trace run. A thread still collecting the | |
2851 | previous run, could trash the trace buffer when resumed. The trace | |
2852 | buffer control structures would have been reset but the thread had | |
2853 | no way to tell. The thread could even midway memcpy'ing to the | |
2854 | buffer, which would mean that when resumed, it would clobber the | |
2855 | trace buffer that had been set for a new run. | |
2856 | ||
2857 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2858 | safely. Say you do tstart while a thread is stopped midway while | |
2859 | collecting. When the thread is later resumed, it finishes the | |
2860 | collection, and returns to the jump pad, to execute the original | |
2861 | instruction that was under the tracepoint jump at the time the | |
2862 | older run had been started. If the jump pad had been rewritten | |
2863 | since for something else in the new run, the thread would now | |
2864 | execute the wrong / random instructions. */ | |
2865 | ||
2866 | static void | |
2867 | linux_stabilize_threads (void) | |
2868 | { | |
0bfdf32f | 2869 | struct thread_info *saved_thread; |
d86d4aaf | 2870 | struct thread_info *thread_stuck; |
fa593d66 | 2871 | |
d86d4aaf DE |
2872 | thread_stuck |
2873 | = (struct thread_info *) find_inferior (&all_threads, | |
2874 | stuck_in_jump_pad_callback, | |
2875 | NULL); | |
2876 | if (thread_stuck != NULL) | |
fa593d66 | 2877 | { |
b4d51a55 | 2878 | if (debug_threads) |
87ce2a04 | 2879 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2880 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2881 | return; |
2882 | } | |
2883 | ||
0bfdf32f | 2884 | saved_thread = current_thread; |
fa593d66 PA |
2885 | |
2886 | stabilizing_threads = 1; | |
2887 | ||
2888 | /* Kick 'em all. */ | |
d86d4aaf | 2889 | for_each_inferior (&all_threads, move_out_of_jump_pad_callback); |
fa593d66 PA |
2890 | |
2891 | /* Loop until all are stopped out of the jump pads. */ | |
d86d4aaf | 2892 | while (find_inferior (&all_threads, lwp_running, NULL) != NULL) |
fa593d66 PA |
2893 | { |
2894 | struct target_waitstatus ourstatus; | |
2895 | struct lwp_info *lwp; | |
fa593d66 PA |
2896 | int wstat; |
2897 | ||
2898 | /* Note that we go through the full wait even loop. While | |
2899 | moving threads out of jump pad, we need to be able to step | |
2900 | over internal breakpoints and such. */ | |
32fcada3 | 2901 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2902 | |
2903 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2904 | { | |
0bfdf32f | 2905 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2906 | |
2907 | /* Lock it. */ | |
863d01bd | 2908 | lwp_suspended_inc (lwp); |
fa593d66 | 2909 | |
a493e3e2 | 2910 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2911 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2912 | { |
2ea28649 | 2913 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2914 | enqueue_one_deferred_signal (lwp, &wstat); |
2915 | } | |
2916 | } | |
2917 | } | |
2918 | ||
d86d4aaf | 2919 | find_inferior (&all_threads, unsuspend_one_lwp, NULL); |
fa593d66 PA |
2920 | |
2921 | stabilizing_threads = 0; | |
2922 | ||
0bfdf32f | 2923 | current_thread = saved_thread; |
fa593d66 | 2924 | |
b4d51a55 | 2925 | if (debug_threads) |
fa593d66 | 2926 | { |
d86d4aaf DE |
2927 | thread_stuck |
2928 | = (struct thread_info *) find_inferior (&all_threads, | |
2929 | stuck_in_jump_pad_callback, | |
2930 | NULL); | |
2931 | if (thread_stuck != NULL) | |
87ce2a04 | 2932 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2933 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2934 | } |
2935 | } | |
2936 | ||
582511be PA |
2937 | /* Convenience function that is called when the kernel reports an |
2938 | event that is not passed out to GDB. */ | |
2939 | ||
2940 | static ptid_t | |
2941 | ignore_event (struct target_waitstatus *ourstatus) | |
2942 | { | |
2943 | /* If we got an event, there may still be others, as a single | |
2944 | SIGCHLD can indicate more than one child stopped. This forces | |
2945 | another target_wait call. */ | |
2946 | async_file_mark (); | |
2947 | ||
2948 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2949 | return null_ptid; | |
2950 | } | |
2951 | ||
65706a29 PA |
2952 | /* Convenience function that is called when the kernel reports an exit |
2953 | event. This decides whether to report the event to GDB as a | |
2954 | process exit event, a thread exit event, or to suppress the | |
2955 | event. */ | |
2956 | ||
2957 | static ptid_t | |
2958 | filter_exit_event (struct lwp_info *event_child, | |
2959 | struct target_waitstatus *ourstatus) | |
2960 | { | |
2961 | struct thread_info *thread = get_lwp_thread (event_child); | |
2962 | ptid_t ptid = ptid_of (thread); | |
2963 | ||
2964 | if (!last_thread_of_process_p (pid_of (thread))) | |
2965 | { | |
2966 | if (report_thread_events) | |
2967 | ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED; | |
2968 | else | |
2969 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2970 | ||
2971 | delete_lwp (event_child); | |
2972 | } | |
2973 | return ptid; | |
2974 | } | |
2975 | ||
0d62e5e8 | 2976 | /* Wait for process, returns status. */ |
da6d8c04 | 2977 | |
95954743 PA |
2978 | static ptid_t |
2979 | linux_wait_1 (ptid_t ptid, | |
2980 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2981 | { |
e5f1222d | 2982 | int w; |
fc7238bb | 2983 | struct lwp_info *event_child; |
bd99dc85 | 2984 | int options; |
bd99dc85 | 2985 | int pid; |
6bf5e0ba PA |
2986 | int step_over_finished; |
2987 | int bp_explains_trap; | |
2988 | int maybe_internal_trap; | |
2989 | int report_to_gdb; | |
219f2f23 | 2990 | int trace_event; |
c2d6af84 | 2991 | int in_step_range; |
f2faf941 | 2992 | int any_resumed; |
bd99dc85 | 2993 | |
87ce2a04 DE |
2994 | if (debug_threads) |
2995 | { | |
2996 | debug_enter (); | |
2997 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
2998 | } | |
2999 | ||
bd99dc85 PA |
3000 | /* Translate generic target options into linux options. */ |
3001 | options = __WALL; | |
3002 | if (target_options & TARGET_WNOHANG) | |
3003 | options |= WNOHANG; | |
0d62e5e8 | 3004 | |
fa593d66 PA |
3005 | bp_explains_trap = 0; |
3006 | trace_event = 0; | |
c2d6af84 | 3007 | in_step_range = 0; |
bd99dc85 PA |
3008 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
3009 | ||
f2faf941 PA |
3010 | /* Find a resumed LWP, if any. */ |
3011 | if (find_inferior (&all_threads, | |
3012 | status_pending_p_callback, | |
3013 | &minus_one_ptid) != NULL) | |
3014 | any_resumed = 1; | |
3015 | else if ((find_inferior (&all_threads, | |
3016 | not_stopped_callback, | |
3017 | &minus_one_ptid) != NULL)) | |
3018 | any_resumed = 1; | |
3019 | else | |
3020 | any_resumed = 0; | |
3021 | ||
6bf5e0ba PA |
3022 | if (ptid_equal (step_over_bkpt, null_ptid)) |
3023 | pid = linux_wait_for_event (ptid, &w, options); | |
3024 | else | |
3025 | { | |
3026 | if (debug_threads) | |
87ce2a04 DE |
3027 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
3028 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
3029 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
3030 | } | |
3031 | ||
f2faf941 | 3032 | if (pid == 0 || (pid == -1 && !any_resumed)) |
87ce2a04 | 3033 | { |
fa96cb38 PA |
3034 | gdb_assert (target_options & TARGET_WNOHANG); |
3035 | ||
87ce2a04 DE |
3036 | if (debug_threads) |
3037 | { | |
fa96cb38 PA |
3038 | debug_printf ("linux_wait_1 ret = null_ptid, " |
3039 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
3040 | debug_exit (); |
3041 | } | |
fa96cb38 PA |
3042 | |
3043 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
3044 | return null_ptid; |
3045 | } | |
fa96cb38 PA |
3046 | else if (pid == -1) |
3047 | { | |
3048 | if (debug_threads) | |
3049 | { | |
3050 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
3051 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
3052 | debug_exit (); | |
3053 | } | |
bd99dc85 | 3054 | |
fa96cb38 PA |
3055 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
3056 | return null_ptid; | |
3057 | } | |
0d62e5e8 | 3058 | |
0bfdf32f | 3059 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 3060 | |
fa96cb38 PA |
3061 | /* linux_wait_for_event only returns an exit status for the last |
3062 | child of a process. Report it. */ | |
3063 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 3064 | { |
fa96cb38 | 3065 | if (WIFEXITED (w)) |
0d62e5e8 | 3066 | { |
fa96cb38 PA |
3067 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
3068 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 3069 | |
fa96cb38 | 3070 | if (debug_threads) |
bd99dc85 | 3071 | { |
fa96cb38 PA |
3072 | debug_printf ("linux_wait_1 ret = %s, exited with " |
3073 | "retcode %d\n", | |
0bfdf32f | 3074 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3075 | WEXITSTATUS (w)); |
3076 | debug_exit (); | |
bd99dc85 | 3077 | } |
fa96cb38 PA |
3078 | } |
3079 | else | |
3080 | { | |
3081 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
3082 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 3083 | |
fa96cb38 PA |
3084 | if (debug_threads) |
3085 | { | |
3086 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
3087 | "signal %d\n", | |
0bfdf32f | 3088 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3089 | WTERMSIG (w)); |
3090 | debug_exit (); | |
3091 | } | |
0d62e5e8 | 3092 | } |
fa96cb38 | 3093 | |
65706a29 PA |
3094 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3095 | return filter_exit_event (event_child, ourstatus); | |
3096 | ||
0bfdf32f | 3097 | return ptid_of (current_thread); |
da6d8c04 DJ |
3098 | } |
3099 | ||
2d97cd35 AT |
3100 | /* If step-over executes a breakpoint instruction, in the case of a |
3101 | hardware single step it means a gdb/gdbserver breakpoint had been | |
3102 | planted on top of a permanent breakpoint, in the case of a software | |
3103 | single step it may just mean that gdbserver hit the reinsert breakpoint. | |
3104 | The PC has been adjusted by check_stopped_by_breakpoint to point at | |
3105 | the breakpoint address. | |
3106 | So in the case of the hardware single step advance the PC manually | |
3107 | past the breakpoint and in the case of software single step advance only | |
3108 | if it's not the reinsert_breakpoint we are hitting. | |
3109 | This avoids that a program would keep trapping a permanent breakpoint | |
3110 | forever. */ | |
8090aef2 | 3111 | if (!ptid_equal (step_over_bkpt, null_ptid) |
2d97cd35 AT |
3112 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
3113 | && (event_child->stepping | |
3114 | || !reinsert_breakpoint_inserted_here (event_child->stop_pc))) | |
8090aef2 | 3115 | { |
dd373349 AT |
3116 | int increment_pc = 0; |
3117 | int breakpoint_kind = 0; | |
3118 | CORE_ADDR stop_pc = event_child->stop_pc; | |
3119 | ||
769ef81f AT |
3120 | breakpoint_kind = |
3121 | the_target->breakpoint_kind_from_current_state (&stop_pc); | |
dd373349 | 3122 | the_target->sw_breakpoint_from_kind (breakpoint_kind, &increment_pc); |
8090aef2 PA |
3123 | |
3124 | if (debug_threads) | |
3125 | { | |
3126 | debug_printf ("step-over for %s executed software breakpoint\n", | |
3127 | target_pid_to_str (ptid_of (current_thread))); | |
3128 | } | |
3129 | ||
3130 | if (increment_pc != 0) | |
3131 | { | |
3132 | struct regcache *regcache | |
3133 | = get_thread_regcache (current_thread, 1); | |
3134 | ||
3135 | event_child->stop_pc += increment_pc; | |
3136 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
3137 | ||
3138 | if (!(*the_low_target.breakpoint_at) (event_child->stop_pc)) | |
15c66dd6 | 3139 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
3140 | } |
3141 | } | |
3142 | ||
6bf5e0ba PA |
3143 | /* If this event was not handled before, and is not a SIGTRAP, we |
3144 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
3145 | a breakpoint is inserted at the current PC. If this target does | |
3146 | not support internal breakpoints at all, we also report the | |
3147 | SIGTRAP without further processing; it's of no concern to us. */ | |
3148 | maybe_internal_trap | |
3149 | = (supports_breakpoints () | |
3150 | && (WSTOPSIG (w) == SIGTRAP | |
3151 | || ((WSTOPSIG (w) == SIGILL | |
3152 | || WSTOPSIG (w) == SIGSEGV) | |
3153 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
3154 | ||
3155 | if (maybe_internal_trap) | |
3156 | { | |
3157 | /* Handle anything that requires bookkeeping before deciding to | |
3158 | report the event or continue waiting. */ | |
3159 | ||
3160 | /* First check if we can explain the SIGTRAP with an internal | |
3161 | breakpoint, or if we should possibly report the event to GDB. | |
3162 | Do this before anything that may remove or insert a | |
3163 | breakpoint. */ | |
3164 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
3165 | ||
3166 | /* We have a SIGTRAP, possibly a step-over dance has just | |
3167 | finished. If so, tweak the state machine accordingly, | |
3168 | reinsert breakpoints and delete any reinsert (software | |
3169 | single-step) breakpoints. */ | |
3170 | step_over_finished = finish_step_over (event_child); | |
3171 | ||
3172 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
3173 | check_breakpoints (event_child->stop_pc); | |
3174 | ||
219f2f23 PA |
3175 | /* Handle tracepoint data collecting. This may overflow the |
3176 | trace buffer, and cause a tracing stop, removing | |
3177 | breakpoints. */ | |
3178 | trace_event = handle_tracepoints (event_child); | |
3179 | ||
6bf5e0ba PA |
3180 | if (bp_explains_trap) |
3181 | { | |
3182 | /* If we stepped or ran into an internal breakpoint, we've | |
3183 | already handled it. So next time we resume (from this | |
3184 | PC), we should step over it. */ | |
3185 | if (debug_threads) | |
87ce2a04 | 3186 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3187 | |
8b07ae33 PA |
3188 | if (breakpoint_here (event_child->stop_pc)) |
3189 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
3190 | } |
3191 | } | |
3192 | else | |
3193 | { | |
3194 | /* We have some other signal, possibly a step-over dance was in | |
3195 | progress, and it should be cancelled too. */ | |
3196 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
3197 | } |
3198 | ||
3199 | /* We have all the data we need. Either report the event to GDB, or | |
3200 | resume threads and keep waiting for more. */ | |
3201 | ||
3202 | /* If we're collecting a fast tracepoint, finish the collection and | |
3203 | move out of the jump pad before delivering a signal. See | |
3204 | linux_stabilize_threads. */ | |
3205 | ||
3206 | if (WIFSTOPPED (w) | |
3207 | && WSTOPSIG (w) != SIGTRAP | |
3208 | && supports_fast_tracepoints () | |
58b4daa5 | 3209 | && agent_loaded_p ()) |
fa593d66 PA |
3210 | { |
3211 | if (debug_threads) | |
87ce2a04 DE |
3212 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
3213 | "to defer or adjust it.\n", | |
0bfdf32f | 3214 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3215 | |
3216 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 3217 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
3218 | && maybe_move_out_of_jump_pad (event_child, &w)) |
3219 | { | |
3220 | enqueue_one_deferred_signal (event_child, &w); | |
3221 | ||
3222 | if (debug_threads) | |
87ce2a04 | 3223 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 3224 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3225 | |
3226 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
582511be PA |
3227 | |
3228 | return ignore_event (ourstatus); | |
fa593d66 PA |
3229 | } |
3230 | } | |
219f2f23 | 3231 | |
fa593d66 PA |
3232 | if (event_child->collecting_fast_tracepoint) |
3233 | { | |
3234 | if (debug_threads) | |
87ce2a04 DE |
3235 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
3236 | "Check if we're already there.\n", | |
0bfdf32f | 3237 | lwpid_of (current_thread), |
87ce2a04 | 3238 | event_child->collecting_fast_tracepoint); |
fa593d66 PA |
3239 | |
3240 | trace_event = 1; | |
3241 | ||
3242 | event_child->collecting_fast_tracepoint | |
3243 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3244 | ||
3245 | if (event_child->collecting_fast_tracepoint != 1) | |
3246 | { | |
3247 | /* No longer need this breakpoint. */ | |
3248 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3249 | { | |
3250 | if (debug_threads) | |
87ce2a04 DE |
3251 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
3252 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
3253 | |
3254 | /* Other running threads could hit this breakpoint. | |
3255 | We don't handle moribund locations like GDB does, | |
3256 | instead we always pause all threads when removing | |
3257 | breakpoints, so that any step-over or | |
3258 | decr_pc_after_break adjustment is always taken | |
3259 | care of while the breakpoint is still | |
3260 | inserted. */ | |
3261 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3262 | |
3263 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3264 | event_child->exit_jump_pad_bkpt = NULL; | |
3265 | ||
3266 | unstop_all_lwps (1, event_child); | |
3267 | ||
3268 | gdb_assert (event_child->suspended >= 0); | |
3269 | } | |
3270 | } | |
3271 | ||
3272 | if (event_child->collecting_fast_tracepoint == 0) | |
3273 | { | |
3274 | if (debug_threads) | |
87ce2a04 DE |
3275 | debug_printf ("fast tracepoint finished " |
3276 | "collecting successfully.\n"); | |
fa593d66 PA |
3277 | |
3278 | /* We may have a deferred signal to report. */ | |
3279 | if (dequeue_one_deferred_signal (event_child, &w)) | |
3280 | { | |
3281 | if (debug_threads) | |
87ce2a04 | 3282 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 3283 | } |
3c11dd79 | 3284 | else |
fa593d66 | 3285 | { |
3c11dd79 | 3286 | if (debug_threads) |
87ce2a04 | 3287 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
3288 | |
3289 | if (stabilizing_threads) | |
3290 | { | |
3291 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 3292 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
3293 | |
3294 | if (debug_threads) | |
3295 | { | |
3296 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
3297 | "while stabilizing threads\n", | |
0bfdf32f | 3298 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
3299 | debug_exit (); |
3300 | } | |
3301 | ||
0bfdf32f | 3302 | return ptid_of (current_thread); |
fa593d66 PA |
3303 | } |
3304 | } | |
3305 | } | |
6bf5e0ba PA |
3306 | } |
3307 | ||
e471f25b PA |
3308 | /* Check whether GDB would be interested in this event. */ |
3309 | ||
3310 | /* If GDB is not interested in this signal, don't stop other | |
3311 | threads, and don't report it to GDB. Just resume the inferior | |
3312 | right away. We do this for threading-related signals as well as | |
3313 | any that GDB specifically requested we ignore. But never ignore | |
3314 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3315 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3316 | handler. Also never ignore signals that could be caused by a |
3317 | breakpoint. */ | |
e471f25b | 3318 | if (WIFSTOPPED (w) |
0bfdf32f | 3319 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3320 | && ( |
1a981360 | 3321 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3322 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3323 | && (WSTOPSIG (w) == __SIGRTMIN |
3324 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3325 | || | |
3326 | #endif | |
2ea28649 | 3327 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3328 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3329 | && current_thread->last_resume_kind == resume_stop) |
3330 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3331 | { |
3332 | siginfo_t info, *info_p; | |
3333 | ||
3334 | if (debug_threads) | |
87ce2a04 | 3335 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 3336 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 3337 | |
0bfdf32f | 3338 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3339 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3340 | info_p = &info; |
3341 | else | |
3342 | info_p = NULL; | |
863d01bd PA |
3343 | |
3344 | if (step_over_finished) | |
3345 | { | |
3346 | /* We cancelled this thread's step-over above. We still | |
3347 | need to unsuspend all other LWPs, and set them back | |
3348 | running again while the signal handler runs. */ | |
3349 | unsuspend_all_lwps (event_child); | |
3350 | ||
3351 | /* Enqueue the pending signal info so that proceed_all_lwps | |
3352 | doesn't lose it. */ | |
3353 | enqueue_pending_signal (event_child, WSTOPSIG (w), info_p); | |
3354 | ||
3355 | proceed_all_lwps (); | |
3356 | } | |
3357 | else | |
3358 | { | |
3359 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3360 | WSTOPSIG (w), info_p); | |
3361 | } | |
582511be | 3362 | return ignore_event (ourstatus); |
e471f25b PA |
3363 | } |
3364 | ||
c2d6af84 PA |
3365 | /* Note that all addresses are always "out of the step range" when |
3366 | there's no range to begin with. */ | |
3367 | in_step_range = lwp_in_step_range (event_child); | |
3368 | ||
3369 | /* If GDB wanted this thread to single step, and the thread is out | |
3370 | of the step range, we always want to report the SIGTRAP, and let | |
3371 | GDB handle it. Watchpoints should always be reported. So should | |
3372 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3373 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3374 | do, we're be able to handle GDB breakpoints on top of internal | |
3375 | breakpoints, by handling the internal breakpoint and still | |
3376 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
863d01bd PA |
3377 | won't see the breakpoint hit. If we see a single-step event but |
3378 | the thread should be continuing, don't pass the trap to gdb. | |
3379 | That indicates that we had previously finished a single-step but | |
3380 | left the single-step pending -- see | |
3381 | complete_ongoing_step_over. */ | |
6bf5e0ba | 3382 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3383 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3384 | && !in_step_range) |
15c66dd6 | 3385 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
863d01bd PA |
3386 | || (!in_step_range |
3387 | && !bp_explains_trap | |
3388 | && !trace_event | |
3389 | && !step_over_finished | |
3390 | && !(current_thread->last_resume_kind == resume_continue | |
3391 | && event_child->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP)) | |
9f3a5c85 | 3392 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3393 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e | 3394 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
00db26fa | 3395 | || event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE); |
d3ce09f5 SS |
3396 | |
3397 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3398 | |
3399 | /* We found no reason GDB would want us to stop. We either hit one | |
3400 | of our own breakpoints, or finished an internal step GDB | |
3401 | shouldn't know about. */ | |
3402 | if (!report_to_gdb) | |
3403 | { | |
3404 | if (debug_threads) | |
3405 | { | |
3406 | if (bp_explains_trap) | |
87ce2a04 | 3407 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3408 | if (step_over_finished) |
87ce2a04 | 3409 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 3410 | if (trace_event) |
87ce2a04 | 3411 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 3412 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
3413 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
3414 | paddress (event_child->stop_pc), | |
3415 | paddress (event_child->step_range_start), | |
3416 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3417 | } |
3418 | ||
3419 | /* We're not reporting this breakpoint to GDB, so apply the | |
3420 | decr_pc_after_break adjustment to the inferior's regcache | |
3421 | ourselves. */ | |
3422 | ||
3423 | if (the_low_target.set_pc != NULL) | |
3424 | { | |
3425 | struct regcache *regcache | |
0bfdf32f | 3426 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
3427 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
3428 | } | |
3429 | ||
7984d532 PA |
3430 | /* We may have finished stepping over a breakpoint. If so, |
3431 | we've stopped and suspended all LWPs momentarily except the | |
3432 | stepping one. This is where we resume them all again. We're | |
3433 | going to keep waiting, so use proceed, which handles stepping | |
3434 | over the next breakpoint. */ | |
6bf5e0ba | 3435 | if (debug_threads) |
87ce2a04 | 3436 | debug_printf ("proceeding all threads.\n"); |
7984d532 PA |
3437 | |
3438 | if (step_over_finished) | |
3439 | unsuspend_all_lwps (event_child); | |
3440 | ||
6bf5e0ba | 3441 | proceed_all_lwps (); |
582511be | 3442 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3443 | } |
3444 | ||
3445 | if (debug_threads) | |
3446 | { | |
00db26fa | 3447 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
ad071a30 PA |
3448 | { |
3449 | char *str; | |
3450 | ||
3451 | str = target_waitstatus_to_string (&event_child->waitstatus); | |
3452 | debug_printf ("LWP %ld: extended event with waitstatus %s\n", | |
3453 | lwpid_of (get_lwp_thread (event_child)), str); | |
3454 | xfree (str); | |
3455 | } | |
0bfdf32f | 3456 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
3457 | { |
3458 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 3459 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 3460 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 3461 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 3462 | } |
15c66dd6 | 3463 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 3464 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 3465 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 3466 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 3467 | if (debug_threads) |
87ce2a04 | 3468 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
3469 | } |
3470 | ||
3471 | /* Alright, we're going to report a stop. */ | |
3472 | ||
582511be | 3473 | if (!stabilizing_threads) |
6bf5e0ba PA |
3474 | { |
3475 | /* In all-stop, stop all threads. */ | |
582511be PA |
3476 | if (!non_stop) |
3477 | stop_all_lwps (0, NULL); | |
6bf5e0ba PA |
3478 | |
3479 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3480 | from among those that have had events. Giving equal priority | |
3481 | to all LWPs that have had events helps prevent | |
3482 | starvation. */ | |
3483 | if (ptid_equal (ptid, minus_one_ptid)) | |
3484 | { | |
3485 | event_child->status_pending_p = 1; | |
3486 | event_child->status_pending = w; | |
3487 | ||
3488 | select_event_lwp (&event_child); | |
3489 | ||
0bfdf32f GB |
3490 | /* current_thread and event_child must stay in sync. */ |
3491 | current_thread = get_lwp_thread (event_child); | |
ee1e2d4f | 3492 | |
6bf5e0ba PA |
3493 | event_child->status_pending_p = 0; |
3494 | w = event_child->status_pending; | |
3495 | } | |
3496 | ||
c03e6ccc | 3497 | if (step_over_finished) |
582511be PA |
3498 | { |
3499 | if (!non_stop) | |
3500 | { | |
3501 | /* If we were doing a step-over, all other threads but | |
3502 | the stepping one had been paused in start_step_over, | |
3503 | with their suspend counts incremented. We don't want | |
3504 | to do a full unstop/unpause, because we're in | |
3505 | all-stop mode (so we want threads stopped), but we | |
3506 | still need to unsuspend the other threads, to | |
3507 | decrement their `suspended' count back. */ | |
3508 | unsuspend_all_lwps (event_child); | |
3509 | } | |
3510 | else | |
3511 | { | |
3512 | /* If we just finished a step-over, then all threads had | |
3513 | been momentarily paused. In all-stop, that's fine, | |
3514 | we want threads stopped by now anyway. In non-stop, | |
3515 | we need to re-resume threads that GDB wanted to be | |
3516 | running. */ | |
3517 | unstop_all_lwps (1, event_child); | |
3518 | } | |
3519 | } | |
c03e6ccc | 3520 | |
fa593d66 | 3521 | /* Stabilize threads (move out of jump pads). */ |
582511be PA |
3522 | if (!non_stop) |
3523 | stabilize_threads (); | |
6bf5e0ba PA |
3524 | } |
3525 | else | |
3526 | { | |
3527 | /* If we just finished a step-over, then all threads had been | |
3528 | momentarily paused. In all-stop, that's fine, we want | |
3529 | threads stopped by now anyway. In non-stop, we need to | |
3530 | re-resume threads that GDB wanted to be running. */ | |
3531 | if (step_over_finished) | |
7984d532 | 3532 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3533 | } |
3534 | ||
00db26fa | 3535 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
de0d863e | 3536 | { |
00db26fa PA |
3537 | /* If the reported event is an exit, fork, vfork or exec, let |
3538 | GDB know. */ | |
3539 | *ourstatus = event_child->waitstatus; | |
de0d863e DB |
3540 | /* Clear the event lwp's waitstatus since we handled it already. */ |
3541 | event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3542 | } | |
3543 | else | |
3544 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
5b1c542e | 3545 | |
582511be | 3546 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3547 | it was a software breakpoint, and the client doesn't know we can |
3548 | adjust the breakpoint ourselves. */ | |
3549 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3550 | && !swbreak_feature) | |
582511be PA |
3551 | { |
3552 | int decr_pc = the_low_target.decr_pc_after_break; | |
3553 | ||
3554 | if (decr_pc != 0) | |
3555 | { | |
3556 | struct regcache *regcache | |
3557 | = get_thread_regcache (current_thread, 1); | |
3558 | (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc); | |
3559 | } | |
3560 | } | |
3561 | ||
0bfdf32f | 3562 | if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3563 | && WSTOPSIG (w) == SIGSTOP) |
bd99dc85 PA |
3564 | { |
3565 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3566 | and it stopped cleanly, so report as SIG0. The use of | |
3567 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3568 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3569 | } |
0bfdf32f | 3570 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3571 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3572 | { |
3573 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3574 | but, it stopped for other reasons. */ |
2ea28649 | 3575 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 | 3576 | } |
de0d863e | 3577 | else if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
bd99dc85 | 3578 | { |
2ea28649 | 3579 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3580 | } |
3581 | ||
d50171e4 PA |
3582 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
3583 | ||
bd99dc85 | 3584 | if (debug_threads) |
87ce2a04 DE |
3585 | { |
3586 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
0bfdf32f | 3587 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3588 | ourstatus->kind, ourstatus->value.sig); |
3589 | debug_exit (); | |
3590 | } | |
bd99dc85 | 3591 | |
65706a29 PA |
3592 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3593 | return filter_exit_event (event_child, ourstatus); | |
3594 | ||
0bfdf32f | 3595 | return ptid_of (current_thread); |
bd99dc85 PA |
3596 | } |
3597 | ||
3598 | /* Get rid of any pending event in the pipe. */ | |
3599 | static void | |
3600 | async_file_flush (void) | |
3601 | { | |
3602 | int ret; | |
3603 | char buf; | |
3604 | ||
3605 | do | |
3606 | ret = read (linux_event_pipe[0], &buf, 1); | |
3607 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3608 | } | |
3609 | ||
3610 | /* Put something in the pipe, so the event loop wakes up. */ | |
3611 | static void | |
3612 | async_file_mark (void) | |
3613 | { | |
3614 | int ret; | |
3615 | ||
3616 | async_file_flush (); | |
3617 | ||
3618 | do | |
3619 | ret = write (linux_event_pipe[1], "+", 1); | |
3620 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3621 | ||
3622 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3623 | be awakened anyway. */ | |
3624 | } | |
3625 | ||
95954743 PA |
3626 | static ptid_t |
3627 | linux_wait (ptid_t ptid, | |
3628 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 3629 | { |
95954743 | 3630 | ptid_t event_ptid; |
bd99dc85 | 3631 | |
bd99dc85 PA |
3632 | /* Flush the async file first. */ |
3633 | if (target_is_async_p ()) | |
3634 | async_file_flush (); | |
3635 | ||
582511be PA |
3636 | do |
3637 | { | |
3638 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); | |
3639 | } | |
3640 | while ((target_options & TARGET_WNOHANG) == 0 | |
3641 | && ptid_equal (event_ptid, null_ptid) | |
3642 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); | |
bd99dc85 PA |
3643 | |
3644 | /* If at least one stop was reported, there may be more. A single | |
3645 | SIGCHLD can signal more than one child stop. */ | |
3646 | if (target_is_async_p () | |
3647 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 3648 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
3649 | async_file_mark (); |
3650 | ||
3651 | return event_ptid; | |
da6d8c04 DJ |
3652 | } |
3653 | ||
c5f62d5f | 3654 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3655 | |
3656 | static int | |
a1928bad | 3657 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3658 | { |
4a6ed09b | 3659 | int ret; |
fd500816 | 3660 | |
4a6ed09b PA |
3661 | errno = 0; |
3662 | ret = syscall (__NR_tkill, lwpid, signo); | |
3663 | if (errno == ENOSYS) | |
3664 | { | |
3665 | /* If tkill fails, then we are not using nptl threads, a | |
3666 | configuration we no longer support. */ | |
3667 | perror_with_name (("tkill")); | |
3668 | } | |
3669 | return ret; | |
fd500816 DJ |
3670 | } |
3671 | ||
964e4306 PA |
3672 | void |
3673 | linux_stop_lwp (struct lwp_info *lwp) | |
3674 | { | |
3675 | send_sigstop (lwp); | |
3676 | } | |
3677 | ||
0d62e5e8 | 3678 | static void |
02fc4de7 | 3679 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3680 | { |
bd99dc85 | 3681 | int pid; |
0d62e5e8 | 3682 | |
d86d4aaf | 3683 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3684 | |
0d62e5e8 DJ |
3685 | /* If we already have a pending stop signal for this process, don't |
3686 | send another. */ | |
54a0b537 | 3687 | if (lwp->stop_expected) |
0d62e5e8 | 3688 | { |
ae13219e | 3689 | if (debug_threads) |
87ce2a04 | 3690 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3691 | |
0d62e5e8 DJ |
3692 | return; |
3693 | } | |
3694 | ||
3695 | if (debug_threads) | |
87ce2a04 | 3696 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3697 | |
d50171e4 | 3698 | lwp->stop_expected = 1; |
bd99dc85 | 3699 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3700 | } |
3701 | ||
7984d532 PA |
3702 | static int |
3703 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 | 3704 | { |
d86d4aaf DE |
3705 | struct thread_info *thread = (struct thread_info *) entry; |
3706 | struct lwp_info *lwp = get_thread_lwp (thread); | |
02fc4de7 | 3707 | |
7984d532 PA |
3708 | /* Ignore EXCEPT. */ |
3709 | if (lwp == except) | |
3710 | return 0; | |
3711 | ||
02fc4de7 | 3712 | if (lwp->stopped) |
7984d532 | 3713 | return 0; |
02fc4de7 PA |
3714 | |
3715 | send_sigstop (lwp); | |
7984d532 PA |
3716 | return 0; |
3717 | } | |
3718 | ||
3719 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3720 | yet. */ | |
3721 | static int | |
3722 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
3723 | void *except) | |
3724 | { | |
d86d4aaf DE |
3725 | struct thread_info *thread = (struct thread_info *) entry; |
3726 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
3727 | |
3728 | /* Ignore EXCEPT. */ | |
3729 | if (lwp == except) | |
3730 | return 0; | |
3731 | ||
863d01bd | 3732 | lwp_suspended_inc (lwp); |
7984d532 PA |
3733 | |
3734 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
3735 | } |
3736 | ||
95954743 PA |
3737 | static void |
3738 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3739 | { | |
95954743 PA |
3740 | /* Store the exit status for later. */ |
3741 | lwp->status_pending_p = 1; | |
3742 | lwp->status_pending = wstat; | |
3743 | ||
00db26fa PA |
3744 | /* Store in waitstatus as well, as there's nothing else to process |
3745 | for this event. */ | |
3746 | if (WIFEXITED (wstat)) | |
3747 | { | |
3748 | lwp->waitstatus.kind = TARGET_WAITKIND_EXITED; | |
3749 | lwp->waitstatus.value.integer = WEXITSTATUS (wstat); | |
3750 | } | |
3751 | else if (WIFSIGNALED (wstat)) | |
3752 | { | |
3753 | lwp->waitstatus.kind = TARGET_WAITKIND_SIGNALLED; | |
3754 | lwp->waitstatus.value.sig = gdb_signal_from_host (WTERMSIG (wstat)); | |
3755 | } | |
3756 | ||
95954743 PA |
3757 | /* Prevent trying to stop it. */ |
3758 | lwp->stopped = 1; | |
3759 | ||
3760 | /* No further stops are expected from a dead lwp. */ | |
3761 | lwp->stop_expected = 0; | |
3762 | } | |
3763 | ||
00db26fa PA |
3764 | /* Return true if LWP has exited already, and has a pending exit event |
3765 | to report to GDB. */ | |
3766 | ||
3767 | static int | |
3768 | lwp_is_marked_dead (struct lwp_info *lwp) | |
3769 | { | |
3770 | return (lwp->status_pending_p | |
3771 | && (WIFEXITED (lwp->status_pending) | |
3772 | || WIFSIGNALED (lwp->status_pending))); | |
3773 | } | |
3774 | ||
fa96cb38 PA |
3775 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
3776 | ||
0d62e5e8 | 3777 | static void |
fa96cb38 | 3778 | wait_for_sigstop (void) |
0d62e5e8 | 3779 | { |
0bfdf32f | 3780 | struct thread_info *saved_thread; |
95954743 | 3781 | ptid_t saved_tid; |
fa96cb38 PA |
3782 | int wstat; |
3783 | int ret; | |
0d62e5e8 | 3784 | |
0bfdf32f GB |
3785 | saved_thread = current_thread; |
3786 | if (saved_thread != NULL) | |
3787 | saved_tid = saved_thread->entry.id; | |
bd99dc85 | 3788 | else |
95954743 | 3789 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3790 | |
d50171e4 | 3791 | if (debug_threads) |
fa96cb38 | 3792 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3793 | |
fa96cb38 PA |
3794 | /* Passing NULL_PTID as filter indicates we want all events to be |
3795 | left pending. Eventually this returns when there are no | |
3796 | unwaited-for children left. */ | |
3797 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
3798 | &wstat, __WALL); | |
3799 | gdb_assert (ret == -1); | |
0d62e5e8 | 3800 | |
0bfdf32f GB |
3801 | if (saved_thread == NULL || linux_thread_alive (saved_tid)) |
3802 | current_thread = saved_thread; | |
0d62e5e8 DJ |
3803 | else |
3804 | { | |
3805 | if (debug_threads) | |
87ce2a04 | 3806 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3807 | |
f0db101d PA |
3808 | /* We can't change the current inferior behind GDB's back, |
3809 | otherwise, a subsequent command may apply to the wrong | |
3810 | process. */ | |
3811 | current_thread = NULL; | |
0d62e5e8 DJ |
3812 | } |
3813 | } | |
3814 | ||
fa593d66 PA |
3815 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3816 | move it out, because we need to report the stop event to GDB. For | |
3817 | example, if the user puts a breakpoint in the jump pad, it's | |
3818 | because she wants to debug it. */ | |
3819 | ||
3820 | static int | |
3821 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3822 | { | |
d86d4aaf DE |
3823 | struct thread_info *thread = (struct thread_info *) entry; |
3824 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 | 3825 | |
863d01bd PA |
3826 | if (lwp->suspended != 0) |
3827 | { | |
3828 | internal_error (__FILE__, __LINE__, | |
3829 | "LWP %ld is suspended, suspended=%d\n", | |
3830 | lwpid_of (thread), lwp->suspended); | |
3831 | } | |
fa593d66 PA |
3832 | gdb_assert (lwp->stopped); |
3833 | ||
3834 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3835 | return (supports_fast_tracepoints () | |
58b4daa5 | 3836 | && agent_loaded_p () |
fa593d66 | 3837 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 3838 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3839 | || thread->last_resume_kind == resume_step) |
3840 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3841 | } | |
3842 | ||
3843 | static void | |
3844 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3845 | { | |
d86d4aaf | 3846 | struct thread_info *thread = (struct thread_info *) entry; |
f0ce0d3a | 3847 | struct thread_info *saved_thread; |
d86d4aaf | 3848 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 PA |
3849 | int *wstat; |
3850 | ||
863d01bd PA |
3851 | if (lwp->suspended != 0) |
3852 | { | |
3853 | internal_error (__FILE__, __LINE__, | |
3854 | "LWP %ld is suspended, suspended=%d\n", | |
3855 | lwpid_of (thread), lwp->suspended); | |
3856 | } | |
fa593d66 PA |
3857 | gdb_assert (lwp->stopped); |
3858 | ||
f0ce0d3a PA |
3859 | /* For gdb_breakpoint_here. */ |
3860 | saved_thread = current_thread; | |
3861 | current_thread = thread; | |
3862 | ||
fa593d66 PA |
3863 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; |
3864 | ||
3865 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3866 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 3867 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3868 | && thread->last_resume_kind != resume_step |
3869 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3870 | { | |
3871 | if (debug_threads) | |
87ce2a04 | 3872 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3873 | lwpid_of (thread)); |
fa593d66 PA |
3874 | |
3875 | if (wstat) | |
3876 | { | |
3877 | lwp->status_pending_p = 0; | |
3878 | enqueue_one_deferred_signal (lwp, wstat); | |
3879 | ||
3880 | if (debug_threads) | |
87ce2a04 DE |
3881 | debug_printf ("Signal %d for LWP %ld deferred " |
3882 | "(in jump pad)\n", | |
d86d4aaf | 3883 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
3884 | } |
3885 | ||
3886 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3887 | } | |
3888 | else | |
863d01bd | 3889 | lwp_suspended_inc (lwp); |
f0ce0d3a PA |
3890 | |
3891 | current_thread = saved_thread; | |
fa593d66 PA |
3892 | } |
3893 | ||
3894 | static int | |
3895 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3896 | { | |
d86d4aaf DE |
3897 | struct thread_info *thread = (struct thread_info *) entry; |
3898 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 | 3899 | |
00db26fa | 3900 | if (lwp_is_marked_dead (lwp)) |
fa593d66 PA |
3901 | return 0; |
3902 | if (lwp->stopped) | |
3903 | return 0; | |
3904 | return 1; | |
3905 | } | |
3906 | ||
7984d532 PA |
3907 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3908 | If SUSPEND, then also increase the suspend count of every LWP, | |
3909 | except EXCEPT. */ | |
3910 | ||
0d62e5e8 | 3911 | static void |
7984d532 | 3912 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3913 | { |
bde24c0a PA |
3914 | /* Should not be called recursively. */ |
3915 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3916 | ||
87ce2a04 DE |
3917 | if (debug_threads) |
3918 | { | |
3919 | debug_enter (); | |
3920 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
3921 | suspend ? "stop-and-suspend" : "stop", | |
3922 | except != NULL | |
d86d4aaf | 3923 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
3924 | : "none"); |
3925 | } | |
3926 | ||
bde24c0a PA |
3927 | stopping_threads = (suspend |
3928 | ? STOPPING_AND_SUSPENDING_THREADS | |
3929 | : STOPPING_THREADS); | |
7984d532 PA |
3930 | |
3931 | if (suspend) | |
d86d4aaf | 3932 | find_inferior (&all_threads, suspend_and_send_sigstop_callback, except); |
7984d532 | 3933 | else |
d86d4aaf | 3934 | find_inferior (&all_threads, send_sigstop_callback, except); |
fa96cb38 | 3935 | wait_for_sigstop (); |
bde24c0a | 3936 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
3937 | |
3938 | if (debug_threads) | |
3939 | { | |
3940 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
3941 | "back to !stopping\n"); | |
3942 | debug_exit (); | |
3943 | } | |
0d62e5e8 DJ |
3944 | } |
3945 | ||
863d01bd PA |
3946 | /* Enqueue one signal in the chain of signals which need to be |
3947 | delivered to this process on next resume. */ | |
3948 | ||
3949 | static void | |
3950 | enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info) | |
3951 | { | |
8d749320 | 3952 | struct pending_signals *p_sig = XNEW (struct pending_signals); |
863d01bd | 3953 | |
863d01bd PA |
3954 | p_sig->prev = lwp->pending_signals; |
3955 | p_sig->signal = signal; | |
3956 | if (info == NULL) | |
3957 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3958 | else | |
3959 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
3960 | lwp->pending_signals = p_sig; | |
3961 | } | |
3962 | ||
fa5308bd AT |
3963 | /* Install breakpoints for software single stepping. */ |
3964 | ||
3965 | static void | |
3966 | install_software_single_step_breakpoints (struct lwp_info *lwp) | |
3967 | { | |
3968 | int i; | |
3969 | CORE_ADDR pc; | |
3970 | struct regcache *regcache = get_thread_regcache (current_thread, 1); | |
3971 | VEC (CORE_ADDR) *next_pcs = NULL; | |
3972 | struct cleanup *old_chain = make_cleanup (VEC_cleanup (CORE_ADDR), &next_pcs); | |
3973 | ||
3974 | pc = get_pc (lwp); | |
3975 | next_pcs = (*the_low_target.get_next_pcs) (pc, regcache); | |
3976 | ||
3977 | for (i = 0; VEC_iterate (CORE_ADDR, next_pcs, i, pc); ++i) | |
3978 | set_reinsert_breakpoint (pc); | |
3979 | ||
3980 | do_cleanups (old_chain); | |
3981 | } | |
3982 | ||
7fe5e27e AT |
3983 | /* Single step via hardware or software single step. |
3984 | Return 1 if hardware single stepping, 0 if software single stepping | |
3985 | or can't single step. */ | |
3986 | ||
3987 | static int | |
3988 | single_step (struct lwp_info* lwp) | |
3989 | { | |
3990 | int step = 0; | |
3991 | ||
3992 | if (can_hardware_single_step ()) | |
3993 | { | |
3994 | step = 1; | |
3995 | } | |
3996 | else if (can_software_single_step ()) | |
3997 | { | |
3998 | install_software_single_step_breakpoints (lwp); | |
3999 | step = 0; | |
4000 | } | |
4001 | else | |
4002 | { | |
4003 | if (debug_threads) | |
4004 | debug_printf ("stepping is not implemented on this target"); | |
4005 | } | |
4006 | ||
4007 | return step; | |
4008 | } | |
4009 | ||
23f238d3 PA |
4010 | /* Resume execution of LWP. If STEP is nonzero, single-step it. If |
4011 | SIGNAL is nonzero, give it that signal. */ | |
da6d8c04 | 4012 | |
ce3a066d | 4013 | static void |
23f238d3 PA |
4014 | linux_resume_one_lwp_throw (struct lwp_info *lwp, |
4015 | int step, int signal, siginfo_t *info) | |
da6d8c04 | 4016 | { |
d86d4aaf | 4017 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4018 | struct thread_info *saved_thread; |
fa593d66 | 4019 | int fast_tp_collecting; |
c06cbd92 YQ |
4020 | struct process_info *proc = get_thread_process (thread); |
4021 | ||
4022 | /* Note that target description may not be initialised | |
4023 | (proc->tdesc == NULL) at this point because the program hasn't | |
4024 | stopped at the first instruction yet. It means GDBserver skips | |
4025 | the extra traps from the wrapper program (see option --wrapper). | |
4026 | Code in this function that requires register access should be | |
4027 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 4028 | |
54a0b537 | 4029 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
4030 | return; |
4031 | ||
65706a29 PA |
4032 | gdb_assert (lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
4033 | ||
fa593d66 PA |
4034 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
4035 | ||
4036 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
4037 | ||
219f2f23 PA |
4038 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
4039 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 4040 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
4041 | { |
4042 | /* Collecting 'while-stepping' actions doesn't make sense | |
4043 | anymore. */ | |
d86d4aaf | 4044 | release_while_stepping_state_list (thread); |
219f2f23 PA |
4045 | } |
4046 | ||
0d62e5e8 DJ |
4047 | /* If we have pending signals or status, and a new signal, enqueue the |
4048 | signal. Also enqueue the signal if we are waiting to reinsert a | |
4049 | breakpoint; it will be picked up again below. */ | |
4050 | if (signal != 0 | |
fa593d66 PA |
4051 | && (lwp->status_pending_p |
4052 | || lwp->pending_signals != NULL | |
4053 | || lwp->bp_reinsert != 0 | |
4054 | || fast_tp_collecting)) | |
0d62e5e8 | 4055 | { |
8d749320 SM |
4056 | struct pending_signals *p_sig = XNEW (struct pending_signals); |
4057 | ||
54a0b537 | 4058 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 4059 | p_sig->signal = signal; |
32ca6d61 DJ |
4060 | if (info == NULL) |
4061 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
4062 | else | |
4063 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 4064 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
4065 | } |
4066 | ||
d50171e4 PA |
4067 | if (lwp->status_pending_p) |
4068 | { | |
4069 | if (debug_threads) | |
87ce2a04 DE |
4070 | debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);" |
4071 | " has pending status\n", | |
d86d4aaf | 4072 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 4073 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
4074 | return; |
4075 | } | |
0d62e5e8 | 4076 | |
0bfdf32f GB |
4077 | saved_thread = current_thread; |
4078 | current_thread = thread; | |
0d62e5e8 DJ |
4079 | |
4080 | if (debug_threads) | |
87ce2a04 | 4081 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", |
d86d4aaf | 4082 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 4083 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
4084 | |
4085 | /* This bit needs some thinking about. If we get a signal that | |
4086 | we must report while a single-step reinsert is still pending, | |
4087 | we often end up resuming the thread. It might be better to | |
4088 | (ew) allow a stack of pending events; then we could be sure that | |
4089 | the reinsert happened right away and not lose any signals. | |
4090 | ||
4091 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 4092 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
4093 | complete correctness, so it won't solve that problem. It may be |
4094 | worthwhile just to solve this one, however. */ | |
54a0b537 | 4095 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
4096 | { |
4097 | if (debug_threads) | |
87ce2a04 DE |
4098 | debug_printf (" pending reinsert at 0x%s\n", |
4099 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 4100 | |
85e00e85 | 4101 | if (can_hardware_single_step ()) |
d50171e4 | 4102 | { |
fa593d66 PA |
4103 | if (fast_tp_collecting == 0) |
4104 | { | |
4105 | if (step == 0) | |
4106 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
4107 | if (lwp->suspended) | |
4108 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
4109 | lwp->suspended); | |
4110 | } | |
d50171e4 PA |
4111 | |
4112 | step = 1; | |
4113 | } | |
0d62e5e8 DJ |
4114 | |
4115 | /* Postpone any pending signal. It was enqueued above. */ | |
4116 | signal = 0; | |
4117 | } | |
4118 | ||
fa593d66 PA |
4119 | if (fast_tp_collecting == 1) |
4120 | { | |
4121 | if (debug_threads) | |
87ce2a04 DE |
4122 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4123 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 4124 | lwpid_of (thread)); |
fa593d66 PA |
4125 | |
4126 | /* Postpone any pending signal. It was enqueued above. */ | |
4127 | signal = 0; | |
4128 | } | |
4129 | else if (fast_tp_collecting == 2) | |
4130 | { | |
4131 | if (debug_threads) | |
87ce2a04 DE |
4132 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4133 | " single-stepping\n", | |
d86d4aaf | 4134 | lwpid_of (thread)); |
fa593d66 PA |
4135 | |
4136 | if (can_hardware_single_step ()) | |
4137 | step = 1; | |
4138 | else | |
38e08fca GB |
4139 | { |
4140 | internal_error (__FILE__, __LINE__, | |
4141 | "moving out of jump pad single-stepping" | |
4142 | " not implemented on this target"); | |
4143 | } | |
fa593d66 PA |
4144 | |
4145 | /* Postpone any pending signal. It was enqueued above. */ | |
4146 | signal = 0; | |
4147 | } | |
4148 | ||
219f2f23 PA |
4149 | /* If we have while-stepping actions in this thread set it stepping. |
4150 | If we have a signal to deliver, it may or may not be set to | |
4151 | SIG_IGN, we don't know. Assume so, and allow collecting | |
4152 | while-stepping into a signal handler. A possible smart thing to | |
4153 | do would be to set an internal breakpoint at the signal return | |
4154 | address, continue, and carry on catching this while-stepping | |
4155 | action only when that breakpoint is hit. A future | |
4156 | enhancement. */ | |
7fe5e27e | 4157 | if (thread->while_stepping != NULL) |
219f2f23 PA |
4158 | { |
4159 | if (debug_threads) | |
87ce2a04 | 4160 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 4161 | lwpid_of (thread)); |
7fe5e27e AT |
4162 | |
4163 | step = single_step (lwp); | |
219f2f23 PA |
4164 | } |
4165 | ||
c06cbd92 | 4166 | if (proc->tdesc != NULL && the_low_target.get_pc != NULL) |
0d62e5e8 | 4167 | { |
0bfdf32f | 4168 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be PA |
4169 | |
4170 | lwp->stop_pc = (*the_low_target.get_pc) (regcache); | |
4171 | ||
4172 | if (debug_threads) | |
4173 | { | |
4174 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
4175 | (long) lwp->stop_pc); | |
4176 | } | |
0d62e5e8 DJ |
4177 | } |
4178 | ||
fa593d66 PA |
4179 | /* If we have pending signals, consume one unless we are trying to |
4180 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
4181 | collect. */ | |
4182 | if (lwp->pending_signals != NULL | |
4183 | && lwp->bp_reinsert == 0 | |
4184 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
4185 | { |
4186 | struct pending_signals **p_sig; | |
4187 | ||
54a0b537 | 4188 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
4189 | while ((*p_sig)->prev != NULL) |
4190 | p_sig = &(*p_sig)->prev; | |
4191 | ||
4192 | signal = (*p_sig)->signal; | |
32ca6d61 | 4193 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 4194 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4195 | &(*p_sig)->info); |
32ca6d61 | 4196 | |
0d62e5e8 DJ |
4197 | free (*p_sig); |
4198 | *p_sig = NULL; | |
4199 | } | |
4200 | ||
aa5ca48f DE |
4201 | if (the_low_target.prepare_to_resume != NULL) |
4202 | the_low_target.prepare_to_resume (lwp); | |
4203 | ||
d86d4aaf | 4204 | regcache_invalidate_thread (thread); |
da6d8c04 | 4205 | errno = 0; |
54a0b537 | 4206 | lwp->stepping = step; |
d86d4aaf | 4207 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (thread), |
b8e1b30e | 4208 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
4209 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4210 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4211 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 4212 | |
0bfdf32f | 4213 | current_thread = saved_thread; |
da6d8c04 | 4214 | if (errno) |
23f238d3 PA |
4215 | perror_with_name ("resuming thread"); |
4216 | ||
4217 | /* Successfully resumed. Clear state that no longer makes sense, | |
4218 | and mark the LWP as running. Must not do this before resuming | |
4219 | otherwise if that fails other code will be confused. E.g., we'd | |
4220 | later try to stop the LWP and hang forever waiting for a stop | |
4221 | status. Note that we must not throw after this is cleared, | |
4222 | otherwise handle_zombie_lwp_error would get confused. */ | |
4223 | lwp->stopped = 0; | |
4224 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4225 | } | |
4226 | ||
4227 | /* Called when we try to resume a stopped LWP and that errors out. If | |
4228 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
4229 | or about to become), discard the error, clear any pending status | |
4230 | the LWP may have, and return true (we'll collect the exit status | |
4231 | soon enough). Otherwise, return false. */ | |
4232 | ||
4233 | static int | |
4234 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
4235 | { | |
4236 | struct thread_info *thread = get_lwp_thread (lp); | |
4237 | ||
4238 | /* If we get an error after resuming the LWP successfully, we'd | |
4239 | confuse !T state for the LWP being gone. */ | |
4240 | gdb_assert (lp->stopped); | |
4241 | ||
4242 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
4243 | because even if ptrace failed with ESRCH, the tracee may be "not | |
4244 | yet fully dead", but already refusing ptrace requests. In that | |
4245 | case the tracee has 'R (Running)' state for a little bit | |
4246 | (observed in Linux 3.18). See also the note on ESRCH in the | |
4247 | ptrace(2) man page. Instead, check whether the LWP has any state | |
4248 | other than ptrace-stopped. */ | |
4249 | ||
4250 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
4251 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 4252 | { |
23f238d3 PA |
4253 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
4254 | lp->status_pending_p = 0; | |
4255 | return 1; | |
4256 | } | |
4257 | return 0; | |
4258 | } | |
4259 | ||
4260 | /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP | |
4261 | disappears while we try to resume it. */ | |
3221518c | 4262 | |
23f238d3 PA |
4263 | static void |
4264 | linux_resume_one_lwp (struct lwp_info *lwp, | |
4265 | int step, int signal, siginfo_t *info) | |
4266 | { | |
4267 | TRY | |
4268 | { | |
4269 | linux_resume_one_lwp_throw (lwp, step, signal, info); | |
4270 | } | |
4271 | CATCH (ex, RETURN_MASK_ERROR) | |
4272 | { | |
4273 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
4274 | throw_exception (ex); | |
3221518c | 4275 | } |
23f238d3 | 4276 | END_CATCH |
da6d8c04 DJ |
4277 | } |
4278 | ||
2bd7c093 PA |
4279 | struct thread_resume_array |
4280 | { | |
4281 | struct thread_resume *resume; | |
4282 | size_t n; | |
4283 | }; | |
64386c31 | 4284 | |
ebcf782c DE |
4285 | /* This function is called once per thread via find_inferior. |
4286 | ARG is a pointer to a thread_resume_array struct. | |
4287 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
4288 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
4289 | |
4290 | This algorithm is O(threads * resume elements), but resume elements | |
4291 | is small (and will remain small at least until GDB supports thread | |
4292 | suspension). */ | |
ebcf782c | 4293 | |
2bd7c093 PA |
4294 | static int |
4295 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 4296 | { |
d86d4aaf DE |
4297 | struct thread_info *thread = (struct thread_info *) entry; |
4298 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 4299 | int ndx; |
2bd7c093 | 4300 | struct thread_resume_array *r; |
64386c31 | 4301 | |
9a3c8263 | 4302 | r = (struct thread_resume_array *) arg; |
64386c31 | 4303 | |
2bd7c093 | 4304 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
4305 | { |
4306 | ptid_t ptid = r->resume[ndx].thread; | |
4307 | if (ptid_equal (ptid, minus_one_ptid) | |
4308 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
4309 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
4310 | of PID'. */ | |
d86d4aaf | 4311 | || (ptid_get_pid (ptid) == pid_of (thread) |
0c9070b3 YQ |
4312 | && (ptid_is_pid (ptid) |
4313 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 4314 | { |
d50171e4 | 4315 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 4316 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4317 | { |
4318 | if (debug_threads) | |
87ce2a04 DE |
4319 | debug_printf ("already %s LWP %ld at GDB's request\n", |
4320 | (thread->last_status.kind | |
4321 | == TARGET_WAITKIND_STOPPED) | |
4322 | ? "stopped" | |
4323 | : "stopping", | |
d86d4aaf | 4324 | lwpid_of (thread)); |
d50171e4 PA |
4325 | |
4326 | continue; | |
4327 | } | |
4328 | ||
95954743 | 4329 | lwp->resume = &r->resume[ndx]; |
8336d594 | 4330 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 4331 | |
c2d6af84 PA |
4332 | lwp->step_range_start = lwp->resume->step_range_start; |
4333 | lwp->step_range_end = lwp->resume->step_range_end; | |
4334 | ||
fa593d66 PA |
4335 | /* If we had a deferred signal to report, dequeue one now. |
4336 | This can happen if LWP gets more than one signal while | |
4337 | trying to get out of a jump pad. */ | |
4338 | if (lwp->stopped | |
4339 | && !lwp->status_pending_p | |
4340 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
4341 | { | |
4342 | lwp->status_pending_p = 1; | |
4343 | ||
4344 | if (debug_threads) | |
87ce2a04 DE |
4345 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
4346 | "leaving status pending.\n", | |
d86d4aaf DE |
4347 | WSTOPSIG (lwp->status_pending), |
4348 | lwpid_of (thread)); | |
fa593d66 PA |
4349 | } |
4350 | ||
95954743 PA |
4351 | return 0; |
4352 | } | |
4353 | } | |
2bd7c093 PA |
4354 | |
4355 | /* No resume action for this thread. */ | |
4356 | lwp->resume = NULL; | |
64386c31 | 4357 | |
2bd7c093 | 4358 | return 0; |
5544ad89 DJ |
4359 | } |
4360 | ||
20ad9378 DE |
4361 | /* find_inferior callback for linux_resume. |
4362 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 4363 | |
bd99dc85 PA |
4364 | static int |
4365 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 4366 | { |
d86d4aaf DE |
4367 | struct thread_info *thread = (struct thread_info *) entry; |
4368 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 4369 | |
bd99dc85 PA |
4370 | /* LWPs which will not be resumed are not interesting, because |
4371 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4372 | if (lwp->resume == NULL) |
bd99dc85 | 4373 | return 0; |
64386c31 | 4374 | |
582511be | 4375 | if (thread_still_has_status_pending_p (thread)) |
d50171e4 PA |
4376 | * (int *) flag_p = 1; |
4377 | ||
4378 | return 0; | |
4379 | } | |
4380 | ||
4381 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
4382 | internal breakpoint that we need to step over. It assumes that any | |
4383 | required STOP_PC adjustment has already been propagated to the | |
4384 | inferior's regcache. */ | |
4385 | ||
4386 | static int | |
4387 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
4388 | { | |
d86d4aaf DE |
4389 | struct thread_info *thread = (struct thread_info *) entry; |
4390 | struct lwp_info *lwp = get_thread_lwp (thread); | |
0bfdf32f | 4391 | struct thread_info *saved_thread; |
d50171e4 | 4392 | CORE_ADDR pc; |
c06cbd92 YQ |
4393 | struct process_info *proc = get_thread_process (thread); |
4394 | ||
4395 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4396 | don't have to do step over. */ | |
4397 | if (proc->tdesc == NULL) | |
4398 | return 0; | |
d50171e4 PA |
4399 | |
4400 | /* LWPs which will not be resumed are not interesting, because we | |
4401 | might not wait for them next time through linux_wait. */ | |
4402 | ||
4403 | if (!lwp->stopped) | |
4404 | { | |
4405 | if (debug_threads) | |
87ce2a04 | 4406 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 4407 | lwpid_of (thread)); |
d50171e4 PA |
4408 | return 0; |
4409 | } | |
4410 | ||
8336d594 | 4411 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4412 | { |
4413 | if (debug_threads) | |
87ce2a04 DE |
4414 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
4415 | " stopped\n", | |
d86d4aaf | 4416 | lwpid_of (thread)); |
d50171e4 PA |
4417 | return 0; |
4418 | } | |
4419 | ||
7984d532 PA |
4420 | gdb_assert (lwp->suspended >= 0); |
4421 | ||
4422 | if (lwp->suspended) | |
4423 | { | |
4424 | if (debug_threads) | |
87ce2a04 | 4425 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 4426 | lwpid_of (thread)); |
7984d532 PA |
4427 | return 0; |
4428 | } | |
4429 | ||
d50171e4 PA |
4430 | if (!lwp->need_step_over) |
4431 | { | |
4432 | if (debug_threads) | |
d86d4aaf | 4433 | debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread)); |
d50171e4 | 4434 | } |
5544ad89 | 4435 | |
bd99dc85 | 4436 | if (lwp->status_pending_p) |
d50171e4 PA |
4437 | { |
4438 | if (debug_threads) | |
87ce2a04 DE |
4439 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
4440 | " status.\n", | |
d86d4aaf | 4441 | lwpid_of (thread)); |
d50171e4 PA |
4442 | return 0; |
4443 | } | |
4444 | ||
4445 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4446 | or we have. */ | |
4447 | pc = get_pc (lwp); | |
4448 | ||
4449 | /* If the PC has changed since we stopped, then don't do anything, | |
4450 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4451 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4452 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4453 | command, or poked thread's registers herself. */ | |
4454 | if (pc != lwp->stop_pc) | |
4455 | { | |
4456 | if (debug_threads) | |
87ce2a04 DE |
4457 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
4458 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
4459 | lwpid_of (thread), |
4460 | paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
4461 | |
4462 | lwp->need_step_over = 0; | |
4463 | return 0; | |
4464 | } | |
4465 | ||
0bfdf32f GB |
4466 | saved_thread = current_thread; |
4467 | current_thread = thread; | |
d50171e4 | 4468 | |
8b07ae33 | 4469 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4470 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4471 | { |
8b07ae33 | 4472 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4473 | though. If the condition is being evaluated on the target's side |
4474 | and it evaluate to false, step over this breakpoint as well. */ | |
4475 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4476 | && gdb_condition_true_at_breakpoint (pc) |
4477 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
4478 | { |
4479 | if (debug_threads) | |
87ce2a04 DE |
4480 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
4481 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 4482 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4483 | |
0bfdf32f | 4484 | current_thread = saved_thread; |
8b07ae33 PA |
4485 | return 0; |
4486 | } | |
4487 | else | |
4488 | { | |
4489 | if (debug_threads) | |
87ce2a04 DE |
4490 | debug_printf ("Need step over [LWP %ld]? yes, " |
4491 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 4492 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4493 | |
8b07ae33 PA |
4494 | /* We've found an lwp that needs stepping over --- return 1 so |
4495 | that find_inferior stops looking. */ | |
0bfdf32f | 4496 | current_thread = saved_thread; |
8b07ae33 PA |
4497 | |
4498 | /* If the step over is cancelled, this is set again. */ | |
4499 | lwp->need_step_over = 0; | |
4500 | return 1; | |
4501 | } | |
d50171e4 PA |
4502 | } |
4503 | ||
0bfdf32f | 4504 | current_thread = saved_thread; |
d50171e4 PA |
4505 | |
4506 | if (debug_threads) | |
87ce2a04 DE |
4507 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
4508 | " at 0x%s\n", | |
d86d4aaf | 4509 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 4510 | |
bd99dc85 | 4511 | return 0; |
5544ad89 DJ |
4512 | } |
4513 | ||
d50171e4 PA |
4514 | /* Start a step-over operation on LWP. When LWP stopped at a |
4515 | breakpoint, to make progress, we need to remove the breakpoint out | |
4516 | of the way. If we let other threads run while we do that, they may | |
4517 | pass by the breakpoint location and miss hitting it. To avoid | |
4518 | that, a step-over momentarily stops all threads while LWP is | |
4519 | single-stepped while the breakpoint is temporarily uninserted from | |
4520 | the inferior. When the single-step finishes, we reinsert the | |
4521 | breakpoint, and let all threads that are supposed to be running, | |
4522 | run again. | |
4523 | ||
4524 | On targets that don't support hardware single-step, we don't | |
4525 | currently support full software single-stepping. Instead, we only | |
4526 | support stepping over the thread event breakpoint, by asking the | |
4527 | low target where to place a reinsert breakpoint. Since this | |
4528 | routine assumes the breakpoint being stepped over is a thread event | |
4529 | breakpoint, it usually assumes the return address of the current | |
4530 | function is a good enough place to set the reinsert breakpoint. */ | |
4531 | ||
4532 | static int | |
4533 | start_step_over (struct lwp_info *lwp) | |
4534 | { | |
d86d4aaf | 4535 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4536 | struct thread_info *saved_thread; |
d50171e4 PA |
4537 | CORE_ADDR pc; |
4538 | int step; | |
4539 | ||
4540 | if (debug_threads) | |
87ce2a04 | 4541 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 4542 | lwpid_of (thread)); |
d50171e4 | 4543 | |
7984d532 | 4544 | stop_all_lwps (1, lwp); |
863d01bd PA |
4545 | |
4546 | if (lwp->suspended != 0) | |
4547 | { | |
4548 | internal_error (__FILE__, __LINE__, | |
4549 | "LWP %ld suspended=%d\n", lwpid_of (thread), | |
4550 | lwp->suspended); | |
4551 | } | |
d50171e4 PA |
4552 | |
4553 | if (debug_threads) | |
87ce2a04 | 4554 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
4555 | |
4556 | /* Note, we should always reach here with an already adjusted PC, | |
4557 | either by GDB (if we're resuming due to GDB's request), or by our | |
4558 | caller, if we just finished handling an internal breakpoint GDB | |
4559 | shouldn't care about. */ | |
4560 | pc = get_pc (lwp); | |
4561 | ||
0bfdf32f GB |
4562 | saved_thread = current_thread; |
4563 | current_thread = thread; | |
d50171e4 PA |
4564 | |
4565 | lwp->bp_reinsert = pc; | |
4566 | uninsert_breakpoints_at (pc); | |
fa593d66 | 4567 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 | 4568 | |
7fe5e27e | 4569 | step = single_step (lwp); |
d50171e4 | 4570 | |
0bfdf32f | 4571 | current_thread = saved_thread; |
d50171e4 PA |
4572 | |
4573 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
4574 | ||
4575 | /* Require next event from this LWP. */ | |
d86d4aaf | 4576 | step_over_bkpt = thread->entry.id; |
d50171e4 PA |
4577 | return 1; |
4578 | } | |
4579 | ||
4580 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
4581 | start_step_over, if still there, and delete any reinsert | |
4582 | breakpoints we've set, on non hardware single-step targets. */ | |
4583 | ||
4584 | static int | |
4585 | finish_step_over (struct lwp_info *lwp) | |
4586 | { | |
4587 | if (lwp->bp_reinsert != 0) | |
4588 | { | |
4589 | if (debug_threads) | |
87ce2a04 | 4590 | debug_printf ("Finished step over.\n"); |
d50171e4 PA |
4591 | |
4592 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
4593 | may be no breakpoint to reinsert there by now. */ | |
4594 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4595 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4596 | |
4597 | lwp->bp_reinsert = 0; | |
4598 | ||
4599 | /* Delete any software-single-step reinsert breakpoints. No | |
4600 | longer needed. We don't have to worry about other threads | |
4601 | hitting this trap, and later not being able to explain it, | |
4602 | because we were stepping over a breakpoint, and we hold all | |
4603 | threads but LWP stopped while doing that. */ | |
4604 | if (!can_hardware_single_step ()) | |
4605 | delete_reinsert_breakpoints (); | |
4606 | ||
4607 | step_over_bkpt = null_ptid; | |
4608 | return 1; | |
4609 | } | |
4610 | else | |
4611 | return 0; | |
4612 | } | |
4613 | ||
863d01bd PA |
4614 | /* If there's a step over in progress, wait until all threads stop |
4615 | (that is, until the stepping thread finishes its step), and | |
4616 | unsuspend all lwps. The stepping thread ends with its status | |
4617 | pending, which is processed later when we get back to processing | |
4618 | events. */ | |
4619 | ||
4620 | static void | |
4621 | complete_ongoing_step_over (void) | |
4622 | { | |
4623 | if (!ptid_equal (step_over_bkpt, null_ptid)) | |
4624 | { | |
4625 | struct lwp_info *lwp; | |
4626 | int wstat; | |
4627 | int ret; | |
4628 | ||
4629 | if (debug_threads) | |
4630 | debug_printf ("detach: step over in progress, finish it first\n"); | |
4631 | ||
4632 | /* Passing NULL_PTID as filter indicates we want all events to | |
4633 | be left pending. Eventually this returns when there are no | |
4634 | unwaited-for children left. */ | |
4635 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
4636 | &wstat, __WALL); | |
4637 | gdb_assert (ret == -1); | |
4638 | ||
4639 | lwp = find_lwp_pid (step_over_bkpt); | |
4640 | if (lwp != NULL) | |
4641 | finish_step_over (lwp); | |
4642 | step_over_bkpt = null_ptid; | |
4643 | unsuspend_all_lwps (lwp); | |
4644 | } | |
4645 | } | |
4646 | ||
5544ad89 DJ |
4647 | /* This function is called once per thread. We check the thread's resume |
4648 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 4649 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 4650 | |
bd99dc85 PA |
4651 | For threads which we aren't explicitly told otherwise, we preserve |
4652 | the stepping flag; this is used for stepping over gdbserver-placed | |
4653 | breakpoints. | |
4654 | ||
4655 | If pending_flags was set in any thread, we queue any needed | |
4656 | signals, since we won't actually resume. We already have a pending | |
4657 | event to report, so we don't need to preserve any step requests; | |
4658 | they should be re-issued if necessary. */ | |
4659 | ||
4660 | static int | |
4661 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 4662 | { |
d86d4aaf DE |
4663 | struct thread_info *thread = (struct thread_info *) entry; |
4664 | struct lwp_info *lwp = get_thread_lwp (thread); | |
bd99dc85 | 4665 | int step; |
d50171e4 PA |
4666 | int leave_all_stopped = * (int *) arg; |
4667 | int leave_pending; | |
5544ad89 | 4668 | |
2bd7c093 | 4669 | if (lwp->resume == NULL) |
bd99dc85 | 4670 | return 0; |
5544ad89 | 4671 | |
bd99dc85 | 4672 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 4673 | { |
bd99dc85 | 4674 | if (debug_threads) |
d86d4aaf | 4675 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
4676 | |
4677 | if (!lwp->stopped) | |
4678 | { | |
4679 | if (debug_threads) | |
d86d4aaf | 4680 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 4681 | |
d50171e4 PA |
4682 | /* Stop the thread, and wait for the event asynchronously, |
4683 | through the event loop. */ | |
02fc4de7 | 4684 | send_sigstop (lwp); |
bd99dc85 PA |
4685 | } |
4686 | else | |
4687 | { | |
4688 | if (debug_threads) | |
87ce2a04 | 4689 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 4690 | lwpid_of (thread)); |
d50171e4 PA |
4691 | |
4692 | /* The LWP may have been stopped in an internal event that | |
4693 | was not meant to be notified back to GDB (e.g., gdbserver | |
4694 | breakpoint), so we should be reporting a stop event in | |
4695 | this case too. */ | |
4696 | ||
4697 | /* If the thread already has a pending SIGSTOP, this is a | |
4698 | no-op. Otherwise, something later will presumably resume | |
4699 | the thread and this will cause it to cancel any pending | |
4700 | operation, due to last_resume_kind == resume_stop. If | |
4701 | the thread already has a pending status to report, we | |
4702 | will still report it the next time we wait - see | |
4703 | status_pending_p_callback. */ | |
1a981360 PA |
4704 | |
4705 | /* If we already have a pending signal to report, then | |
4706 | there's no need to queue a SIGSTOP, as this means we're | |
4707 | midway through moving the LWP out of the jumppad, and we | |
4708 | will report the pending signal as soon as that is | |
4709 | finished. */ | |
4710 | if (lwp->pending_signals_to_report == NULL) | |
4711 | send_sigstop (lwp); | |
bd99dc85 | 4712 | } |
32ca6d61 | 4713 | |
bd99dc85 PA |
4714 | /* For stop requests, we're done. */ |
4715 | lwp->resume = NULL; | |
fc7238bb | 4716 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4717 | return 0; |
5544ad89 DJ |
4718 | } |
4719 | ||
bd99dc85 | 4720 | /* If this thread which is about to be resumed has a pending status, |
863d01bd PA |
4721 | then don't resume it - we can just report the pending status. |
4722 | Likewise if it is suspended, because e.g., another thread is | |
4723 | stepping past a breakpoint. Make sure to queue any signals that | |
4724 | would otherwise be sent. In all-stop mode, we do this decision | |
4725 | based on if *any* thread has a pending status. If there's a | |
4726 | thread that needs the step-over-breakpoint dance, then don't | |
4727 | resume any other thread but that particular one. */ | |
4728 | leave_pending = (lwp->suspended | |
4729 | || lwp->status_pending_p | |
4730 | || leave_all_stopped); | |
5544ad89 | 4731 | |
d50171e4 | 4732 | if (!leave_pending) |
bd99dc85 PA |
4733 | { |
4734 | if (debug_threads) | |
d86d4aaf | 4735 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 4736 | |
d50171e4 | 4737 | step = (lwp->resume->kind == resume_step); |
2acc282a | 4738 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
4739 | } |
4740 | else | |
4741 | { | |
4742 | if (debug_threads) | |
d86d4aaf | 4743 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
5544ad89 | 4744 | |
bd99dc85 PA |
4745 | /* If we have a new signal, enqueue the signal. */ |
4746 | if (lwp->resume->sig != 0) | |
4747 | { | |
8d749320 SM |
4748 | struct pending_signals *p_sig = XCNEW (struct pending_signals); |
4749 | ||
bd99dc85 PA |
4750 | p_sig->prev = lwp->pending_signals; |
4751 | p_sig->signal = lwp->resume->sig; | |
bd99dc85 PA |
4752 | |
4753 | /* If this is the same signal we were previously stopped by, | |
4754 | make sure to queue its siginfo. We can ignore the return | |
4755 | value of ptrace; if it fails, we'll skip | |
4756 | PTRACE_SETSIGINFO. */ | |
4757 | if (WIFSTOPPED (lwp->last_status) | |
4758 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
d86d4aaf | 4759 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4760 | &p_sig->info); |
bd99dc85 PA |
4761 | |
4762 | lwp->pending_signals = p_sig; | |
4763 | } | |
4764 | } | |
5544ad89 | 4765 | |
fc7238bb | 4766 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4767 | lwp->resume = NULL; |
5544ad89 | 4768 | return 0; |
0d62e5e8 DJ |
4769 | } |
4770 | ||
4771 | static void | |
2bd7c093 | 4772 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 4773 | { |
2bd7c093 | 4774 | struct thread_resume_array array = { resume_info, n }; |
d86d4aaf | 4775 | struct thread_info *need_step_over = NULL; |
d50171e4 PA |
4776 | int any_pending; |
4777 | int leave_all_stopped; | |
c6ecbae5 | 4778 | |
87ce2a04 DE |
4779 | if (debug_threads) |
4780 | { | |
4781 | debug_enter (); | |
4782 | debug_printf ("linux_resume:\n"); | |
4783 | } | |
4784 | ||
2bd7c093 | 4785 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 4786 | |
d50171e4 PA |
4787 | /* If there is a thread which would otherwise be resumed, which has |
4788 | a pending status, then don't resume any threads - we can just | |
4789 | report the pending status. Make sure to queue any signals that | |
4790 | would otherwise be sent. In non-stop mode, we'll apply this | |
4791 | logic to each thread individually. We consume all pending events | |
4792 | before considering to start a step-over (in all-stop). */ | |
4793 | any_pending = 0; | |
bd99dc85 | 4794 | if (!non_stop) |
d86d4aaf | 4795 | find_inferior (&all_threads, resume_status_pending_p, &any_pending); |
d50171e4 PA |
4796 | |
4797 | /* If there is a thread which would otherwise be resumed, which is | |
4798 | stopped at a breakpoint that needs stepping over, then don't | |
4799 | resume any threads - have it step over the breakpoint with all | |
4800 | other threads stopped, then resume all threads again. Make sure | |
4801 | to queue any signals that would otherwise be delivered or | |
4802 | queued. */ | |
4803 | if (!any_pending && supports_breakpoints ()) | |
4804 | need_step_over | |
d86d4aaf DE |
4805 | = (struct thread_info *) find_inferior (&all_threads, |
4806 | need_step_over_p, NULL); | |
d50171e4 PA |
4807 | |
4808 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
4809 | ||
4810 | if (debug_threads) | |
4811 | { | |
4812 | if (need_step_over != NULL) | |
87ce2a04 | 4813 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 4814 | else if (any_pending) |
87ce2a04 DE |
4815 | debug_printf ("Not resuming, all-stop and found " |
4816 | "an LWP with pending status\n"); | |
d50171e4 | 4817 | else |
87ce2a04 | 4818 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4819 | } |
4820 | ||
4821 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4822 | otherwise deliver. */ | |
4823 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
4824 | ||
4825 | if (need_step_over) | |
d86d4aaf | 4826 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4827 | |
4828 | if (debug_threads) | |
4829 | { | |
4830 | debug_printf ("linux_resume done\n"); | |
4831 | debug_exit (); | |
4832 | } | |
1bebeeca PA |
4833 | |
4834 | /* We may have events that were pending that can/should be sent to | |
4835 | the client now. Trigger a linux_wait call. */ | |
4836 | if (target_is_async_p ()) | |
4837 | async_file_mark (); | |
d50171e4 PA |
4838 | } |
4839 | ||
4840 | /* This function is called once per thread. We check the thread's | |
4841 | last resume request, which will tell us whether to resume, step, or | |
4842 | leave the thread stopped. Any signal the client requested to be | |
4843 | delivered has already been enqueued at this point. | |
4844 | ||
4845 | If any thread that GDB wants running is stopped at an internal | |
4846 | breakpoint that needs stepping over, we start a step-over operation | |
4847 | on that particular thread, and leave all others stopped. */ | |
4848 | ||
7984d532 PA |
4849 | static int |
4850 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 4851 | { |
d86d4aaf DE |
4852 | struct thread_info *thread = (struct thread_info *) entry; |
4853 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
4854 | int step; |
4855 | ||
7984d532 PA |
4856 | if (lwp == except) |
4857 | return 0; | |
d50171e4 PA |
4858 | |
4859 | if (debug_threads) | |
d86d4aaf | 4860 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4861 | |
4862 | if (!lwp->stopped) | |
4863 | { | |
4864 | if (debug_threads) | |
d86d4aaf | 4865 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
7984d532 | 4866 | return 0; |
d50171e4 PA |
4867 | } |
4868 | ||
02fc4de7 PA |
4869 | if (thread->last_resume_kind == resume_stop |
4870 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4871 | { |
4872 | if (debug_threads) | |
87ce2a04 | 4873 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4874 | lwpid_of (thread)); |
7984d532 | 4875 | return 0; |
d50171e4 PA |
4876 | } |
4877 | ||
4878 | if (lwp->status_pending_p) | |
4879 | { | |
4880 | if (debug_threads) | |
87ce2a04 | 4881 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4882 | lwpid_of (thread)); |
7984d532 | 4883 | return 0; |
d50171e4 PA |
4884 | } |
4885 | ||
7984d532 PA |
4886 | gdb_assert (lwp->suspended >= 0); |
4887 | ||
d50171e4 PA |
4888 | if (lwp->suspended) |
4889 | { | |
4890 | if (debug_threads) | |
d86d4aaf | 4891 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
7984d532 | 4892 | return 0; |
d50171e4 PA |
4893 | } |
4894 | ||
1a981360 PA |
4895 | if (thread->last_resume_kind == resume_stop |
4896 | && lwp->pending_signals_to_report == NULL | |
4897 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
4898 | { |
4899 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4900 | last_status.kind check above would catch it, and we wouldn't | |
4901 | reach here. This LWP may have been momentarily paused by a | |
4902 | stop_all_lwps call while handling for example, another LWP's | |
4903 | step-over. In that case, the pending expected SIGSTOP signal | |
4904 | that was queued at vCont;t handling time will have already | |
4905 | been consumed by wait_for_sigstop, and so we need to requeue | |
4906 | another one here. Note that if the LWP already has a SIGSTOP | |
4907 | pending, this is a no-op. */ | |
4908 | ||
4909 | if (debug_threads) | |
87ce2a04 DE |
4910 | debug_printf ("Client wants LWP %ld to stop. " |
4911 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 4912 | lwpid_of (thread)); |
02fc4de7 PA |
4913 | |
4914 | send_sigstop (lwp); | |
4915 | } | |
4916 | ||
863d01bd PA |
4917 | if (thread->last_resume_kind == resume_step) |
4918 | { | |
4919 | if (debug_threads) | |
4920 | debug_printf (" stepping LWP %ld, client wants it stepping\n", | |
4921 | lwpid_of (thread)); | |
4922 | step = 1; | |
4923 | } | |
4924 | else if (lwp->bp_reinsert != 0) | |
4925 | { | |
4926 | if (debug_threads) | |
4927 | debug_printf (" stepping LWP %ld, reinsert set\n", | |
4928 | lwpid_of (thread)); | |
4929 | step = 1; | |
4930 | } | |
4931 | else | |
4932 | step = 0; | |
4933 | ||
d50171e4 | 4934 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
4935 | return 0; |
4936 | } | |
4937 | ||
4938 | static int | |
4939 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
4940 | { | |
d86d4aaf DE |
4941 | struct thread_info *thread = (struct thread_info *) entry; |
4942 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
4943 | |
4944 | if (lwp == except) | |
4945 | return 0; | |
4946 | ||
863d01bd | 4947 | lwp_suspended_decr (lwp); |
7984d532 PA |
4948 | |
4949 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
4950 | } |
4951 | ||
4952 | /* When we finish a step-over, set threads running again. If there's | |
4953 | another thread that may need a step-over, now's the time to start | |
4954 | it. Eventually, we'll move all threads past their breakpoints. */ | |
4955 | ||
4956 | static void | |
4957 | proceed_all_lwps (void) | |
4958 | { | |
d86d4aaf | 4959 | struct thread_info *need_step_over; |
d50171e4 PA |
4960 | |
4961 | /* If there is a thread which would otherwise be resumed, which is | |
4962 | stopped at a breakpoint that needs stepping over, then don't | |
4963 | resume any threads - have it step over the breakpoint with all | |
4964 | other threads stopped, then resume all threads again. */ | |
4965 | ||
4966 | if (supports_breakpoints ()) | |
4967 | { | |
4968 | need_step_over | |
d86d4aaf DE |
4969 | = (struct thread_info *) find_inferior (&all_threads, |
4970 | need_step_over_p, NULL); | |
d50171e4 PA |
4971 | |
4972 | if (need_step_over != NULL) | |
4973 | { | |
4974 | if (debug_threads) | |
87ce2a04 DE |
4975 | debug_printf ("proceed_all_lwps: found " |
4976 | "thread %ld needing a step-over\n", | |
4977 | lwpid_of (need_step_over)); | |
d50171e4 | 4978 | |
d86d4aaf | 4979 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
4980 | return; |
4981 | } | |
4982 | } | |
5544ad89 | 4983 | |
d50171e4 | 4984 | if (debug_threads) |
87ce2a04 | 4985 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 4986 | |
d86d4aaf | 4987 | find_inferior (&all_threads, proceed_one_lwp, NULL); |
d50171e4 PA |
4988 | } |
4989 | ||
4990 | /* Stopped LWPs that the client wanted to be running, that don't have | |
4991 | pending statuses, are set to run again, except for EXCEPT, if not | |
4992 | NULL. This undoes a stop_all_lwps call. */ | |
4993 | ||
4994 | static void | |
7984d532 | 4995 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 4996 | { |
5544ad89 DJ |
4997 | if (debug_threads) |
4998 | { | |
87ce2a04 | 4999 | debug_enter (); |
d50171e4 | 5000 | if (except) |
87ce2a04 | 5001 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 5002 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 5003 | else |
87ce2a04 | 5004 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
5005 | } |
5006 | ||
7984d532 | 5007 | if (unsuspend) |
d86d4aaf | 5008 | find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except); |
7984d532 | 5009 | else |
d86d4aaf | 5010 | find_inferior (&all_threads, proceed_one_lwp, except); |
87ce2a04 DE |
5011 | |
5012 | if (debug_threads) | |
5013 | { | |
5014 | debug_printf ("unstop_all_lwps done\n"); | |
5015 | debug_exit (); | |
5016 | } | |
0d62e5e8 DJ |
5017 | } |
5018 | ||
58caa3dc DJ |
5019 | |
5020 | #ifdef HAVE_LINUX_REGSETS | |
5021 | ||
1faeff08 MR |
5022 | #define use_linux_regsets 1 |
5023 | ||
030031ee PA |
5024 | /* Returns true if REGSET has been disabled. */ |
5025 | ||
5026 | static int | |
5027 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
5028 | { | |
5029 | return (info->disabled_regsets != NULL | |
5030 | && info->disabled_regsets[regset - info->regsets]); | |
5031 | } | |
5032 | ||
5033 | /* Disable REGSET. */ | |
5034 | ||
5035 | static void | |
5036 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
5037 | { | |
5038 | int dr_offset; | |
5039 | ||
5040 | dr_offset = regset - info->regsets; | |
5041 | if (info->disabled_regsets == NULL) | |
224c3ddb | 5042 | info->disabled_regsets = (char *) xcalloc (1, info->num_regsets); |
030031ee PA |
5043 | info->disabled_regsets[dr_offset] = 1; |
5044 | } | |
5045 | ||
58caa3dc | 5046 | static int |
3aee8918 PA |
5047 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
5048 | struct regcache *regcache) | |
58caa3dc DJ |
5049 | { |
5050 | struct regset_info *regset; | |
e9d25b98 | 5051 | int saw_general_regs = 0; |
95954743 | 5052 | int pid; |
1570b33e | 5053 | struct iovec iov; |
58caa3dc | 5054 | |
0bfdf32f | 5055 | pid = lwpid_of (current_thread); |
28eef672 | 5056 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5057 | { |
1570b33e L |
5058 | void *buf, *data; |
5059 | int nt_type, res; | |
58caa3dc | 5060 | |
030031ee | 5061 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 5062 | continue; |
58caa3dc | 5063 | |
bca929d3 | 5064 | buf = xmalloc (regset->size); |
1570b33e L |
5065 | |
5066 | nt_type = regset->nt_type; | |
5067 | if (nt_type) | |
5068 | { | |
5069 | iov.iov_base = buf; | |
5070 | iov.iov_len = regset->size; | |
5071 | data = (void *) &iov; | |
5072 | } | |
5073 | else | |
5074 | data = buf; | |
5075 | ||
dfb64f85 | 5076 | #ifndef __sparc__ |
f15f9948 | 5077 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5078 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5079 | #else |
1570b33e | 5080 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5081 | #endif |
58caa3dc DJ |
5082 | if (res < 0) |
5083 | { | |
5084 | if (errno == EIO) | |
5085 | { | |
52fa2412 | 5086 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 5087 | this process mode. */ |
030031ee | 5088 | disable_regset (regsets_info, regset); |
58caa3dc | 5089 | } |
e5a9158d AA |
5090 | else if (errno == ENODATA) |
5091 | { | |
5092 | /* ENODATA may be returned if the regset is currently | |
5093 | not "active". This can happen in normal operation, | |
5094 | so suppress the warning in this case. */ | |
5095 | } | |
58caa3dc DJ |
5096 | else |
5097 | { | |
0d62e5e8 | 5098 | char s[256]; |
95954743 PA |
5099 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
5100 | pid); | |
0d62e5e8 | 5101 | perror (s); |
58caa3dc DJ |
5102 | } |
5103 | } | |
098dbe61 AA |
5104 | else |
5105 | { | |
5106 | if (regset->type == GENERAL_REGS) | |
5107 | saw_general_regs = 1; | |
5108 | regset->store_function (regcache, buf); | |
5109 | } | |
fdeb2a12 | 5110 | free (buf); |
58caa3dc | 5111 | } |
e9d25b98 DJ |
5112 | if (saw_general_regs) |
5113 | return 0; | |
5114 | else | |
5115 | return 1; | |
58caa3dc DJ |
5116 | } |
5117 | ||
5118 | static int | |
3aee8918 PA |
5119 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
5120 | struct regcache *regcache) | |
58caa3dc DJ |
5121 | { |
5122 | struct regset_info *regset; | |
e9d25b98 | 5123 | int saw_general_regs = 0; |
95954743 | 5124 | int pid; |
1570b33e | 5125 | struct iovec iov; |
58caa3dc | 5126 | |
0bfdf32f | 5127 | pid = lwpid_of (current_thread); |
28eef672 | 5128 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5129 | { |
1570b33e L |
5130 | void *buf, *data; |
5131 | int nt_type, res; | |
58caa3dc | 5132 | |
feea5f36 AA |
5133 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
5134 | || regset->fill_function == NULL) | |
28eef672 | 5135 | continue; |
58caa3dc | 5136 | |
bca929d3 | 5137 | buf = xmalloc (regset->size); |
545587ee DJ |
5138 | |
5139 | /* First fill the buffer with the current register set contents, | |
5140 | in case there are any items in the kernel's regset that are | |
5141 | not in gdbserver's regcache. */ | |
1570b33e L |
5142 | |
5143 | nt_type = regset->nt_type; | |
5144 | if (nt_type) | |
5145 | { | |
5146 | iov.iov_base = buf; | |
5147 | iov.iov_len = regset->size; | |
5148 | data = (void *) &iov; | |
5149 | } | |
5150 | else | |
5151 | data = buf; | |
5152 | ||
dfb64f85 | 5153 | #ifndef __sparc__ |
f15f9948 | 5154 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5155 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5156 | #else |
689cc2ae | 5157 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5158 | #endif |
545587ee DJ |
5159 | |
5160 | if (res == 0) | |
5161 | { | |
5162 | /* Then overlay our cached registers on that. */ | |
442ea881 | 5163 | regset->fill_function (regcache, buf); |
545587ee DJ |
5164 | |
5165 | /* Only now do we write the register set. */ | |
dfb64f85 | 5166 | #ifndef __sparc__ |
f15f9948 | 5167 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 5168 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5169 | #else |
1570b33e | 5170 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 5171 | #endif |
545587ee DJ |
5172 | } |
5173 | ||
58caa3dc DJ |
5174 | if (res < 0) |
5175 | { | |
5176 | if (errno == EIO) | |
5177 | { | |
52fa2412 | 5178 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 5179 | this process mode. */ |
030031ee | 5180 | disable_regset (regsets_info, regset); |
58caa3dc | 5181 | } |
3221518c UW |
5182 | else if (errno == ESRCH) |
5183 | { | |
1b3f6016 PA |
5184 | /* At this point, ESRCH should mean the process is |
5185 | already gone, in which case we simply ignore attempts | |
5186 | to change its registers. See also the related | |
5187 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 5188 | free (buf); |
3221518c UW |
5189 | return 0; |
5190 | } | |
58caa3dc DJ |
5191 | else |
5192 | { | |
ce3a066d | 5193 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
5194 | } |
5195 | } | |
e9d25b98 DJ |
5196 | else if (regset->type == GENERAL_REGS) |
5197 | saw_general_regs = 1; | |
09ec9b38 | 5198 | free (buf); |
58caa3dc | 5199 | } |
e9d25b98 DJ |
5200 | if (saw_general_regs) |
5201 | return 0; | |
5202 | else | |
5203 | return 1; | |
58caa3dc DJ |
5204 | } |
5205 | ||
1faeff08 | 5206 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 5207 | |
1faeff08 | 5208 | #define use_linux_regsets 0 |
3aee8918 PA |
5209 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
5210 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 5211 | |
58caa3dc | 5212 | #endif |
1faeff08 MR |
5213 | |
5214 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
5215 | calls or 0 if it has to be transferred individually. */ | |
5216 | ||
5217 | static int | |
3aee8918 | 5218 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
5219 | { |
5220 | unsigned char mask = 1 << (regno % 8); | |
5221 | size_t index = regno / 8; | |
5222 | ||
5223 | return (use_linux_regsets | |
3aee8918 PA |
5224 | && (regs_info->regset_bitmap == NULL |
5225 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
5226 | } |
5227 | ||
58caa3dc | 5228 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
5229 | |
5230 | int | |
3aee8918 | 5231 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
5232 | { |
5233 | int addr; | |
5234 | ||
3aee8918 | 5235 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
5236 | error ("Invalid register number %d.", regnum); |
5237 | ||
3aee8918 | 5238 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
5239 | |
5240 | return addr; | |
5241 | } | |
5242 | ||
5243 | /* Fetch one register. */ | |
5244 | static void | |
3aee8918 PA |
5245 | fetch_register (const struct usrregs_info *usrregs, |
5246 | struct regcache *regcache, int regno) | |
1faeff08 MR |
5247 | { |
5248 | CORE_ADDR regaddr; | |
5249 | int i, size; | |
5250 | char *buf; | |
5251 | int pid; | |
5252 | ||
3aee8918 | 5253 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
5254 | return; |
5255 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
5256 | return; | |
5257 | ||
3aee8918 | 5258 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5259 | if (regaddr == -1) |
5260 | return; | |
5261 | ||
3aee8918 PA |
5262 | size = ((register_size (regcache->tdesc, regno) |
5263 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5264 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5265 | buf = (char *) alloca (size); |
1faeff08 | 5266 | |
0bfdf32f | 5267 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5268 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5269 | { | |
5270 | errno = 0; | |
5271 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
5272 | ptrace (PTRACE_PEEKUSER, pid, | |
5273 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5274 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5275 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
5276 | regaddr += sizeof (PTRACE_XFER_TYPE); |
5277 | if (errno != 0) | |
5278 | error ("reading register %d: %s", regno, strerror (errno)); | |
5279 | } | |
5280 | ||
5281 | if (the_low_target.supply_ptrace_register) | |
5282 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
5283 | else | |
5284 | supply_register (regcache, regno, buf); | |
5285 | } | |
5286 | ||
5287 | /* Store one register. */ | |
5288 | static void | |
3aee8918 PA |
5289 | store_register (const struct usrregs_info *usrregs, |
5290 | struct regcache *regcache, int regno) | |
1faeff08 MR |
5291 | { |
5292 | CORE_ADDR regaddr; | |
5293 | int i, size; | |
5294 | char *buf; | |
5295 | int pid; | |
5296 | ||
3aee8918 | 5297 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
5298 | return; |
5299 | if ((*the_low_target.cannot_store_register) (regno)) | |
5300 | return; | |
5301 | ||
3aee8918 | 5302 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5303 | if (regaddr == -1) |
5304 | return; | |
5305 | ||
3aee8918 PA |
5306 | size = ((register_size (regcache->tdesc, regno) |
5307 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5308 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5309 | buf = (char *) alloca (size); |
1faeff08 MR |
5310 | memset (buf, 0, size); |
5311 | ||
5312 | if (the_low_target.collect_ptrace_register) | |
5313 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
5314 | else | |
5315 | collect_register (regcache, regno, buf); | |
5316 | ||
0bfdf32f | 5317 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5318 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5319 | { | |
5320 | errno = 0; | |
5321 | ptrace (PTRACE_POKEUSER, pid, | |
5322 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5323 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5324 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
5325 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
5326 | if (errno != 0) |
5327 | { | |
5328 | /* At this point, ESRCH should mean the process is | |
5329 | already gone, in which case we simply ignore attempts | |
5330 | to change its registers. See also the related | |
5331 | comment in linux_resume_one_lwp. */ | |
5332 | if (errno == ESRCH) | |
5333 | return; | |
5334 | ||
5335 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
5336 | error ("writing register %d: %s", regno, strerror (errno)); | |
5337 | } | |
5338 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
5339 | } | |
5340 | } | |
5341 | ||
5342 | /* Fetch all registers, or just one, from the child process. | |
5343 | If REGNO is -1, do this for all registers, skipping any that are | |
5344 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
5345 | unless ALL is non-zero. | |
5346 | Otherwise, REGNO specifies which register (so we can save time). */ | |
5347 | static void | |
3aee8918 PA |
5348 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
5349 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 5350 | { |
3aee8918 PA |
5351 | struct usrregs_info *usr = regs_info->usrregs; |
5352 | ||
1faeff08 MR |
5353 | if (regno == -1) |
5354 | { | |
3aee8918 PA |
5355 | for (regno = 0; regno < usr->num_regs; regno++) |
5356 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5357 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
5358 | } |
5359 | else | |
3aee8918 | 5360 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
5361 | } |
5362 | ||
5363 | /* Store our register values back into the inferior. | |
5364 | If REGNO is -1, do this for all registers, skipping any that are | |
5365 | assumed to have been saved by regsets_store_inferior_registers, | |
5366 | unless ALL is non-zero. | |
5367 | Otherwise, REGNO specifies which register (so we can save time). */ | |
5368 | static void | |
3aee8918 PA |
5369 | usr_store_inferior_registers (const struct regs_info *regs_info, |
5370 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 5371 | { |
3aee8918 PA |
5372 | struct usrregs_info *usr = regs_info->usrregs; |
5373 | ||
1faeff08 MR |
5374 | if (regno == -1) |
5375 | { | |
3aee8918 PA |
5376 | for (regno = 0; regno < usr->num_regs; regno++) |
5377 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5378 | store_register (usr, regcache, regno); | |
1faeff08 MR |
5379 | } |
5380 | else | |
3aee8918 | 5381 | store_register (usr, regcache, regno); |
1faeff08 MR |
5382 | } |
5383 | ||
5384 | #else /* !HAVE_LINUX_USRREGS */ | |
5385 | ||
3aee8918 PA |
5386 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
5387 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 5388 | |
58caa3dc | 5389 | #endif |
1faeff08 MR |
5390 | |
5391 | ||
5392 | void | |
5393 | linux_fetch_registers (struct regcache *regcache, int regno) | |
5394 | { | |
5395 | int use_regsets; | |
5396 | int all = 0; | |
3aee8918 | 5397 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5398 | |
5399 | if (regno == -1) | |
5400 | { | |
3aee8918 PA |
5401 | if (the_low_target.fetch_register != NULL |
5402 | && regs_info->usrregs != NULL) | |
5403 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
5404 | (*the_low_target.fetch_register) (regcache, regno); |
5405 | ||
3aee8918 PA |
5406 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5407 | if (regs_info->usrregs != NULL) | |
5408 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5409 | } |
5410 | else | |
5411 | { | |
c14dfd32 PA |
5412 | if (the_low_target.fetch_register != NULL |
5413 | && (*the_low_target.fetch_register) (regcache, regno)) | |
5414 | return; | |
5415 | ||
3aee8918 | 5416 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5417 | if (use_regsets) |
3aee8918 PA |
5418 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5419 | regcache); | |
5420 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5421 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5422 | } |
58caa3dc DJ |
5423 | } |
5424 | ||
5425 | void | |
442ea881 | 5426 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 5427 | { |
1faeff08 MR |
5428 | int use_regsets; |
5429 | int all = 0; | |
3aee8918 | 5430 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5431 | |
5432 | if (regno == -1) | |
5433 | { | |
3aee8918 PA |
5434 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5435 | regcache); | |
5436 | if (regs_info->usrregs != NULL) | |
5437 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5438 | } |
5439 | else | |
5440 | { | |
3aee8918 | 5441 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5442 | if (use_regsets) |
3aee8918 PA |
5443 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5444 | regcache); | |
5445 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5446 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5447 | } |
58caa3dc DJ |
5448 | } |
5449 | ||
da6d8c04 | 5450 | |
da6d8c04 DJ |
5451 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
5452 | to debugger memory starting at MYADDR. */ | |
5453 | ||
c3e735a6 | 5454 | static int |
f450004a | 5455 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 5456 | { |
0bfdf32f | 5457 | int pid = lwpid_of (current_thread); |
4934b29e MR |
5458 | register PTRACE_XFER_TYPE *buffer; |
5459 | register CORE_ADDR addr; | |
5460 | register int count; | |
5461 | char filename[64]; | |
da6d8c04 | 5462 | register int i; |
4934b29e | 5463 | int ret; |
fd462a61 | 5464 | int fd; |
fd462a61 DJ |
5465 | |
5466 | /* Try using /proc. Don't bother for one word. */ | |
5467 | if (len >= 3 * sizeof (long)) | |
5468 | { | |
4934b29e MR |
5469 | int bytes; |
5470 | ||
fd462a61 DJ |
5471 | /* We could keep this file open and cache it - possibly one per |
5472 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5473 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5474 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5475 | if (fd == -1) | |
5476 | goto no_proc; | |
5477 | ||
5478 | /* If pread64 is available, use it. It's faster if the kernel | |
5479 | supports it (only one syscall), and it's 64-bit safe even on | |
5480 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5481 | application). */ | |
5482 | #ifdef HAVE_PREAD64 | |
4934b29e | 5483 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5484 | #else |
4934b29e MR |
5485 | bytes = -1; |
5486 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5487 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5488 | #endif |
fd462a61 DJ |
5489 | |
5490 | close (fd); | |
4934b29e MR |
5491 | if (bytes == len) |
5492 | return 0; | |
5493 | ||
5494 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5495 | if (bytes > 0) | |
5496 | { | |
5497 | memaddr += bytes; | |
5498 | myaddr += bytes; | |
5499 | len -= bytes; | |
5500 | } | |
fd462a61 | 5501 | } |
da6d8c04 | 5502 | |
fd462a61 | 5503 | no_proc: |
4934b29e MR |
5504 | /* Round starting address down to longword boundary. */ |
5505 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5506 | /* Round ending address up; get number of longwords that makes. */ | |
5507 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5508 | / sizeof (PTRACE_XFER_TYPE)); | |
5509 | /* Allocate buffer of that many longwords. */ | |
8d749320 | 5510 | buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
4934b29e | 5511 | |
da6d8c04 | 5512 | /* Read all the longwords */ |
4934b29e | 5513 | errno = 0; |
da6d8c04 DJ |
5514 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5515 | { | |
14ce3065 DE |
5516 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5517 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5518 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5519 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5520 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5521 | if (errno) |
4934b29e | 5522 | break; |
da6d8c04 | 5523 | } |
4934b29e | 5524 | ret = errno; |
da6d8c04 DJ |
5525 | |
5526 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5527 | if (i > 0) |
5528 | { | |
5529 | i *= sizeof (PTRACE_XFER_TYPE); | |
5530 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5531 | memcpy (myaddr, | |
5532 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5533 | i < len ? i : len); | |
5534 | } | |
c3e735a6 | 5535 | |
4934b29e | 5536 | return ret; |
da6d8c04 DJ |
5537 | } |
5538 | ||
93ae6fdc PA |
5539 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5540 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5541 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5542 | |
ce3a066d | 5543 | static int |
f450004a | 5544 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
5545 | { |
5546 | register int i; | |
5547 | /* Round starting address down to longword boundary. */ | |
5548 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5549 | /* Round ending address up; get number of longwords that makes. */ | |
5550 | register int count | |
493e2a69 MS |
5551 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5552 | / sizeof (PTRACE_XFER_TYPE); | |
5553 | ||
da6d8c04 | 5554 | /* Allocate buffer of that many longwords. */ |
8d749320 | 5555 | register PTRACE_XFER_TYPE *buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
493e2a69 | 5556 | |
0bfdf32f | 5557 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5558 | |
f0ae6fc3 PA |
5559 | if (len == 0) |
5560 | { | |
5561 | /* Zero length write always succeeds. */ | |
5562 | return 0; | |
5563 | } | |
5564 | ||
0d62e5e8 DJ |
5565 | if (debug_threads) |
5566 | { | |
58d6951d | 5567 | /* Dump up to four bytes. */ |
bf47e248 PA |
5568 | char str[4 * 2 + 1]; |
5569 | char *p = str; | |
5570 | int dump = len < 4 ? len : 4; | |
5571 | ||
5572 | for (i = 0; i < dump; i++) | |
5573 | { | |
5574 | sprintf (p, "%02x", myaddr[i]); | |
5575 | p += 2; | |
5576 | } | |
5577 | *p = '\0'; | |
5578 | ||
5579 | debug_printf ("Writing %s to 0x%08lx in process %d\n", | |
5580 | str, (long) memaddr, pid); | |
0d62e5e8 DJ |
5581 | } |
5582 | ||
da6d8c04 DJ |
5583 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
5584 | ||
93ae6fdc | 5585 | errno = 0; |
14ce3065 DE |
5586 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5587 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5588 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5589 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5590 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
5591 | if (errno) |
5592 | return errno; | |
da6d8c04 DJ |
5593 | |
5594 | if (count > 1) | |
5595 | { | |
93ae6fdc | 5596 | errno = 0; |
da6d8c04 | 5597 | buffer[count - 1] |
95954743 | 5598 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
5599 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
5600 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5601 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 5602 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 5603 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
5604 | if (errno) |
5605 | return errno; | |
da6d8c04 DJ |
5606 | } |
5607 | ||
93ae6fdc | 5608 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 5609 | |
493e2a69 MS |
5610 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
5611 | myaddr, len); | |
da6d8c04 DJ |
5612 | |
5613 | /* Write the entire buffer. */ | |
5614 | ||
5615 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
5616 | { | |
5617 | errno = 0; | |
14ce3065 DE |
5618 | ptrace (PTRACE_POKETEXT, pid, |
5619 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5620 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5621 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5622 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
5623 | if (errno) |
5624 | return errno; | |
5625 | } | |
5626 | ||
5627 | return 0; | |
5628 | } | |
2f2893d9 DJ |
5629 | |
5630 | static void | |
5631 | linux_look_up_symbols (void) | |
5632 | { | |
0d62e5e8 | 5633 | #ifdef USE_THREAD_DB |
95954743 PA |
5634 | struct process_info *proc = current_process (); |
5635 | ||
fe978cb0 | 5636 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
5637 | return; |
5638 | ||
9b4c5f87 | 5639 | thread_db_init (); |
0d62e5e8 DJ |
5640 | #endif |
5641 | } | |
5642 | ||
e5379b03 | 5643 | static void |
ef57601b | 5644 | linux_request_interrupt (void) |
e5379b03 | 5645 | { |
a1928bad | 5646 | extern unsigned long signal_pid; |
e5379b03 | 5647 | |
78708b7c PA |
5648 | /* Send a SIGINT to the process group. This acts just like the user |
5649 | typed a ^C on the controlling terminal. */ | |
5650 | kill (-signal_pid, SIGINT); | |
e5379b03 DJ |
5651 | } |
5652 | ||
aa691b87 RM |
5653 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
5654 | to debugger memory starting at MYADDR. */ | |
5655 | ||
5656 | static int | |
f450004a | 5657 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
5658 | { |
5659 | char filename[PATH_MAX]; | |
5660 | int fd, n; | |
0bfdf32f | 5661 | int pid = lwpid_of (current_thread); |
aa691b87 | 5662 | |
6cebaf6e | 5663 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
5664 | |
5665 | fd = open (filename, O_RDONLY); | |
5666 | if (fd < 0) | |
5667 | return -1; | |
5668 | ||
5669 | if (offset != (CORE_ADDR) 0 | |
5670 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5671 | n = -1; | |
5672 | else | |
5673 | n = read (fd, myaddr, len); | |
5674 | ||
5675 | close (fd); | |
5676 | ||
5677 | return n; | |
5678 | } | |
5679 | ||
d993e290 PA |
5680 | /* These breakpoint and watchpoint related wrapper functions simply |
5681 | pass on the function call if the target has registered a | |
5682 | corresponding function. */ | |
e013ee27 OF |
5683 | |
5684 | static int | |
802e8e6d PA |
5685 | linux_supports_z_point_type (char z_type) |
5686 | { | |
5687 | return (the_low_target.supports_z_point_type != NULL | |
5688 | && the_low_target.supports_z_point_type (z_type)); | |
5689 | } | |
5690 | ||
5691 | static int | |
5692 | linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5693 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5694 | { |
c8f4bfdd YQ |
5695 | if (type == raw_bkpt_type_sw) |
5696 | return insert_memory_breakpoint (bp); | |
5697 | else if (the_low_target.insert_point != NULL) | |
802e8e6d | 5698 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
5699 | else |
5700 | /* Unsupported (see target.h). */ | |
5701 | return 1; | |
5702 | } | |
5703 | ||
5704 | static int | |
802e8e6d PA |
5705 | linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
5706 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5707 | { |
c8f4bfdd YQ |
5708 | if (type == raw_bkpt_type_sw) |
5709 | return remove_memory_breakpoint (bp); | |
5710 | else if (the_low_target.remove_point != NULL) | |
802e8e6d | 5711 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
5712 | else |
5713 | /* Unsupported (see target.h). */ | |
5714 | return 1; | |
5715 | } | |
5716 | ||
3e572f71 PA |
5717 | /* Implement the to_stopped_by_sw_breakpoint target_ops |
5718 | method. */ | |
5719 | ||
5720 | static int | |
5721 | linux_stopped_by_sw_breakpoint (void) | |
5722 | { | |
5723 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5724 | ||
5725 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
5726 | } | |
5727 | ||
5728 | /* Implement the to_supports_stopped_by_sw_breakpoint target_ops | |
5729 | method. */ | |
5730 | ||
5731 | static int | |
5732 | linux_supports_stopped_by_sw_breakpoint (void) | |
5733 | { | |
5734 | return USE_SIGTRAP_SIGINFO; | |
5735 | } | |
5736 | ||
5737 | /* Implement the to_stopped_by_hw_breakpoint target_ops | |
5738 | method. */ | |
5739 | ||
5740 | static int | |
5741 | linux_stopped_by_hw_breakpoint (void) | |
5742 | { | |
5743 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5744 | ||
5745 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
5746 | } | |
5747 | ||
5748 | /* Implement the to_supports_stopped_by_hw_breakpoint target_ops | |
5749 | method. */ | |
5750 | ||
5751 | static int | |
5752 | linux_supports_stopped_by_hw_breakpoint (void) | |
5753 | { | |
5754 | return USE_SIGTRAP_SIGINFO; | |
5755 | } | |
5756 | ||
70b90b91 | 5757 | /* Implement the supports_hardware_single_step target_ops method. */ |
45614f15 YQ |
5758 | |
5759 | static int | |
70b90b91 | 5760 | linux_supports_hardware_single_step (void) |
45614f15 | 5761 | { |
45614f15 YQ |
5762 | return can_hardware_single_step (); |
5763 | } | |
5764 | ||
7d00775e AT |
5765 | static int |
5766 | linux_supports_software_single_step (void) | |
5767 | { | |
5768 | return can_software_single_step (); | |
5769 | } | |
5770 | ||
e013ee27 OF |
5771 | static int |
5772 | linux_stopped_by_watchpoint (void) | |
5773 | { | |
0bfdf32f | 5774 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 5775 | |
15c66dd6 | 5776 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
5777 | } |
5778 | ||
5779 | static CORE_ADDR | |
5780 | linux_stopped_data_address (void) | |
5781 | { | |
0bfdf32f | 5782 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
5783 | |
5784 | return lwp->stopped_data_address; | |
e013ee27 OF |
5785 | } |
5786 | ||
db0dfaa0 LM |
5787 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
5788 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
5789 | && defined(PT_TEXT_END_ADDR) | |
5790 | ||
5791 | /* This is only used for targets that define PT_TEXT_ADDR, | |
5792 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
5793 | the target has different ways of acquiring this information, like | |
5794 | loadmaps. */ | |
52fb6437 NS |
5795 | |
5796 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
5797 | to tell gdb about. */ | |
5798 | ||
5799 | static int | |
5800 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
5801 | { | |
52fb6437 | 5802 | unsigned long text, text_end, data; |
62828379 | 5803 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
5804 | |
5805 | errno = 0; | |
5806 | ||
b8e1b30e LM |
5807 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
5808 | (PTRACE_TYPE_ARG4) 0); | |
5809 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
5810 | (PTRACE_TYPE_ARG4) 0); | |
5811 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
5812 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
5813 | |
5814 | if (errno == 0) | |
5815 | { | |
5816 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
5817 | used by gdb) are relative to the beginning of the program, |
5818 | with the data segment immediately following the text segment. | |
5819 | However, the actual runtime layout in memory may put the data | |
5820 | somewhere else, so when we send gdb a data base-address, we | |
5821 | use the real data base address and subtract the compile-time | |
5822 | data base-address from it (which is just the length of the | |
5823 | text segment). BSS immediately follows data in both | |
5824 | cases. */ | |
52fb6437 NS |
5825 | *text_p = text; |
5826 | *data_p = data - (text_end - text); | |
1b3f6016 | 5827 | |
52fb6437 NS |
5828 | return 1; |
5829 | } | |
52fb6437 NS |
5830 | return 0; |
5831 | } | |
5832 | #endif | |
5833 | ||
07e059b5 VP |
5834 | static int |
5835 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
5836 | unsigned char *readbuf, unsigned const char *writebuf, |
5837 | CORE_ADDR offset, int len) | |
07e059b5 | 5838 | { |
d26e3629 | 5839 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5840 | } |
5841 | ||
d0722149 DE |
5842 | /* Convert a native/host siginfo object, into/from the siginfo in the |
5843 | layout of the inferiors' architecture. */ | |
5844 | ||
5845 | static void | |
a5362b9a | 5846 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
5847 | { |
5848 | int done = 0; | |
5849 | ||
5850 | if (the_low_target.siginfo_fixup != NULL) | |
5851 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
5852 | ||
5853 | /* If there was no callback, or the callback didn't do anything, | |
5854 | then just do a straight memcpy. */ | |
5855 | if (!done) | |
5856 | { | |
5857 | if (direction == 1) | |
a5362b9a | 5858 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 5859 | else |
a5362b9a | 5860 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
5861 | } |
5862 | } | |
5863 | ||
4aa995e1 PA |
5864 | static int |
5865 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
5866 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
5867 | { | |
d0722149 | 5868 | int pid; |
a5362b9a TS |
5869 | siginfo_t siginfo; |
5870 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 | 5871 | |
0bfdf32f | 5872 | if (current_thread == NULL) |
4aa995e1 PA |
5873 | return -1; |
5874 | ||
0bfdf32f | 5875 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
5876 | |
5877 | if (debug_threads) | |
87ce2a04 DE |
5878 | debug_printf ("%s siginfo for lwp %d.\n", |
5879 | readbuf != NULL ? "Reading" : "Writing", | |
5880 | pid); | |
4aa995e1 | 5881 | |
0adea5f7 | 5882 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
5883 | return -1; |
5884 | ||
b8e1b30e | 5885 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5886 | return -1; |
5887 | ||
d0722149 DE |
5888 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
5889 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
5890 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
5891 | with a 32-bit GDBSERVER, we need to convert it. */ | |
5892 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
5893 | ||
4aa995e1 PA |
5894 | if (offset + len > sizeof (siginfo)) |
5895 | len = sizeof (siginfo) - offset; | |
5896 | ||
5897 | if (readbuf != NULL) | |
d0722149 | 5898 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
5899 | else |
5900 | { | |
d0722149 DE |
5901 | memcpy (inf_siginfo + offset, writebuf, len); |
5902 | ||
5903 | /* Convert back to ptrace layout before flushing it out. */ | |
5904 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
5905 | ||
b8e1b30e | 5906 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5907 | return -1; |
5908 | } | |
5909 | ||
5910 | return len; | |
5911 | } | |
5912 | ||
bd99dc85 PA |
5913 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5914 | so we notice when children change state; as the handler for the | |
5915 | sigsuspend in my_waitpid. */ | |
5916 | ||
5917 | static void | |
5918 | sigchld_handler (int signo) | |
5919 | { | |
5920 | int old_errno = errno; | |
5921 | ||
5922 | if (debug_threads) | |
e581f2b4 PA |
5923 | { |
5924 | do | |
5925 | { | |
5926 | /* fprintf is not async-signal-safe, so call write | |
5927 | directly. */ | |
5928 | if (write (2, "sigchld_handler\n", | |
5929 | sizeof ("sigchld_handler\n") - 1) < 0) | |
5930 | break; /* just ignore */ | |
5931 | } while (0); | |
5932 | } | |
bd99dc85 PA |
5933 | |
5934 | if (target_is_async_p ()) | |
5935 | async_file_mark (); /* trigger a linux_wait */ | |
5936 | ||
5937 | errno = old_errno; | |
5938 | } | |
5939 | ||
5940 | static int | |
5941 | linux_supports_non_stop (void) | |
5942 | { | |
5943 | return 1; | |
5944 | } | |
5945 | ||
5946 | static int | |
5947 | linux_async (int enable) | |
5948 | { | |
7089dca4 | 5949 | int previous = target_is_async_p (); |
bd99dc85 | 5950 | |
8336d594 | 5951 | if (debug_threads) |
87ce2a04 DE |
5952 | debug_printf ("linux_async (%d), previous=%d\n", |
5953 | enable, previous); | |
8336d594 | 5954 | |
bd99dc85 PA |
5955 | if (previous != enable) |
5956 | { | |
5957 | sigset_t mask; | |
5958 | sigemptyset (&mask); | |
5959 | sigaddset (&mask, SIGCHLD); | |
5960 | ||
5961 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
5962 | ||
5963 | if (enable) | |
5964 | { | |
5965 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
5966 | { |
5967 | linux_event_pipe[0] = -1; | |
5968 | linux_event_pipe[1] = -1; | |
5969 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5970 | ||
5971 | warning ("creating event pipe failed."); | |
5972 | return previous; | |
5973 | } | |
bd99dc85 PA |
5974 | |
5975 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5976 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5977 | ||
5978 | /* Register the event loop handler. */ | |
5979 | add_file_handler (linux_event_pipe[0], | |
5980 | handle_target_event, NULL); | |
5981 | ||
5982 | /* Always trigger a linux_wait. */ | |
5983 | async_file_mark (); | |
5984 | } | |
5985 | else | |
5986 | { | |
5987 | delete_file_handler (linux_event_pipe[0]); | |
5988 | ||
5989 | close (linux_event_pipe[0]); | |
5990 | close (linux_event_pipe[1]); | |
5991 | linux_event_pipe[0] = -1; | |
5992 | linux_event_pipe[1] = -1; | |
5993 | } | |
5994 | ||
5995 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5996 | } | |
5997 | ||
5998 | return previous; | |
5999 | } | |
6000 | ||
6001 | static int | |
6002 | linux_start_non_stop (int nonstop) | |
6003 | { | |
6004 | /* Register or unregister from event-loop accordingly. */ | |
6005 | linux_async (nonstop); | |
aa96c426 GB |
6006 | |
6007 | if (target_is_async_p () != (nonstop != 0)) | |
6008 | return -1; | |
6009 | ||
bd99dc85 PA |
6010 | return 0; |
6011 | } | |
6012 | ||
cf8fd78b PA |
6013 | static int |
6014 | linux_supports_multi_process (void) | |
6015 | { | |
6016 | return 1; | |
6017 | } | |
6018 | ||
89245bc0 DB |
6019 | /* Check if fork events are supported. */ |
6020 | ||
6021 | static int | |
6022 | linux_supports_fork_events (void) | |
6023 | { | |
6024 | return linux_supports_tracefork (); | |
6025 | } | |
6026 | ||
6027 | /* Check if vfork events are supported. */ | |
6028 | ||
6029 | static int | |
6030 | linux_supports_vfork_events (void) | |
6031 | { | |
6032 | return linux_supports_tracefork (); | |
6033 | } | |
6034 | ||
94585166 DB |
6035 | /* Check if exec events are supported. */ |
6036 | ||
6037 | static int | |
6038 | linux_supports_exec_events (void) | |
6039 | { | |
6040 | return linux_supports_traceexec (); | |
6041 | } | |
6042 | ||
de0d863e DB |
6043 | /* Callback for 'find_inferior'. Set the (possibly changed) ptrace |
6044 | options for the specified lwp. */ | |
6045 | ||
6046 | static int | |
6047 | reset_lwp_ptrace_options_callback (struct inferior_list_entry *entry, | |
6048 | void *args) | |
6049 | { | |
6050 | struct thread_info *thread = (struct thread_info *) entry; | |
6051 | struct lwp_info *lwp = get_thread_lwp (thread); | |
6052 | ||
6053 | if (!lwp->stopped) | |
6054 | { | |
6055 | /* Stop the lwp so we can modify its ptrace options. */ | |
6056 | lwp->must_set_ptrace_flags = 1; | |
6057 | linux_stop_lwp (lwp); | |
6058 | } | |
6059 | else | |
6060 | { | |
6061 | /* Already stopped; go ahead and set the ptrace options. */ | |
6062 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
6063 | int options = linux_low_ptrace_options (proc->attached); | |
6064 | ||
6065 | linux_enable_event_reporting (lwpid_of (thread), options); | |
6066 | lwp->must_set_ptrace_flags = 0; | |
6067 | } | |
6068 | ||
6069 | return 0; | |
6070 | } | |
6071 | ||
6072 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the | |
6073 | ptrace flags for all inferiors. This is in case the new GDB connection | |
6074 | doesn't support the same set of events that the previous one did. */ | |
6075 | ||
6076 | static void | |
6077 | linux_handle_new_gdb_connection (void) | |
6078 | { | |
6079 | pid_t pid; | |
6080 | ||
6081 | /* Request that all the lwps reset their ptrace options. */ | |
6082 | find_inferior (&all_threads, reset_lwp_ptrace_options_callback , &pid); | |
6083 | } | |
6084 | ||
03583c20 UW |
6085 | static int |
6086 | linux_supports_disable_randomization (void) | |
6087 | { | |
6088 | #ifdef HAVE_PERSONALITY | |
6089 | return 1; | |
6090 | #else | |
6091 | return 0; | |
6092 | #endif | |
6093 | } | |
efcbbd14 | 6094 | |
d1feda86 YQ |
6095 | static int |
6096 | linux_supports_agent (void) | |
6097 | { | |
6098 | return 1; | |
6099 | } | |
6100 | ||
c2d6af84 PA |
6101 | static int |
6102 | linux_supports_range_stepping (void) | |
6103 | { | |
6104 | if (*the_low_target.supports_range_stepping == NULL) | |
6105 | return 0; | |
6106 | ||
6107 | return (*the_low_target.supports_range_stepping) (); | |
6108 | } | |
6109 | ||
efcbbd14 UW |
6110 | /* Enumerate spufs IDs for process PID. */ |
6111 | static int | |
6112 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
6113 | { | |
6114 | int pos = 0; | |
6115 | int written = 0; | |
6116 | char path[128]; | |
6117 | DIR *dir; | |
6118 | struct dirent *entry; | |
6119 | ||
6120 | sprintf (path, "/proc/%ld/fd", pid); | |
6121 | dir = opendir (path); | |
6122 | if (!dir) | |
6123 | return -1; | |
6124 | ||
6125 | rewinddir (dir); | |
6126 | while ((entry = readdir (dir)) != NULL) | |
6127 | { | |
6128 | struct stat st; | |
6129 | struct statfs stfs; | |
6130 | int fd; | |
6131 | ||
6132 | fd = atoi (entry->d_name); | |
6133 | if (!fd) | |
6134 | continue; | |
6135 | ||
6136 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
6137 | if (stat (path, &st) != 0) | |
6138 | continue; | |
6139 | if (!S_ISDIR (st.st_mode)) | |
6140 | continue; | |
6141 | ||
6142 | if (statfs (path, &stfs) != 0) | |
6143 | continue; | |
6144 | if (stfs.f_type != SPUFS_MAGIC) | |
6145 | continue; | |
6146 | ||
6147 | if (pos >= offset && pos + 4 <= offset + len) | |
6148 | { | |
6149 | *(unsigned int *)(buf + pos - offset) = fd; | |
6150 | written += 4; | |
6151 | } | |
6152 | pos += 4; | |
6153 | } | |
6154 | ||
6155 | closedir (dir); | |
6156 | return written; | |
6157 | } | |
6158 | ||
6159 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
6160 | object type, using the /proc file system. */ | |
6161 | static int | |
6162 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
6163 | unsigned const char *writebuf, | |
6164 | CORE_ADDR offset, int len) | |
6165 | { | |
0bfdf32f | 6166 | long pid = lwpid_of (current_thread); |
efcbbd14 UW |
6167 | char buf[128]; |
6168 | int fd = 0; | |
6169 | int ret = 0; | |
6170 | ||
6171 | if (!writebuf && !readbuf) | |
6172 | return -1; | |
6173 | ||
6174 | if (!*annex) | |
6175 | { | |
6176 | if (!readbuf) | |
6177 | return -1; | |
6178 | else | |
6179 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
6180 | } | |
6181 | ||
6182 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
6183 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
6184 | if (fd <= 0) | |
6185 | return -1; | |
6186 | ||
6187 | if (offset != 0 | |
6188 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
6189 | { | |
6190 | close (fd); | |
6191 | return 0; | |
6192 | } | |
6193 | ||
6194 | if (writebuf) | |
6195 | ret = write (fd, writebuf, (size_t) len); | |
6196 | else | |
6197 | ret = read (fd, readbuf, (size_t) len); | |
6198 | ||
6199 | close (fd); | |
6200 | return ret; | |
6201 | } | |
6202 | ||
723b724b | 6203 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
6204 | struct target_loadseg |
6205 | { | |
6206 | /* Core address to which the segment is mapped. */ | |
6207 | Elf32_Addr addr; | |
6208 | /* VMA recorded in the program header. */ | |
6209 | Elf32_Addr p_vaddr; | |
6210 | /* Size of this segment in memory. */ | |
6211 | Elf32_Word p_memsz; | |
6212 | }; | |
6213 | ||
723b724b | 6214 | # if defined PT_GETDSBT |
78d85199 YQ |
6215 | struct target_loadmap |
6216 | { | |
6217 | /* Protocol version number, must be zero. */ | |
6218 | Elf32_Word version; | |
6219 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
6220 | unsigned *dsbt_table; | |
6221 | unsigned dsbt_size, dsbt_index; | |
6222 | /* Number of segments in this map. */ | |
6223 | Elf32_Word nsegs; | |
6224 | /* The actual memory map. */ | |
6225 | struct target_loadseg segs[/*nsegs*/]; | |
6226 | }; | |
723b724b MF |
6227 | # define LINUX_LOADMAP PT_GETDSBT |
6228 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
6229 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
6230 | # else | |
6231 | struct target_loadmap | |
6232 | { | |
6233 | /* Protocol version number, must be zero. */ | |
6234 | Elf32_Half version; | |
6235 | /* Number of segments in this map. */ | |
6236 | Elf32_Half nsegs; | |
6237 | /* The actual memory map. */ | |
6238 | struct target_loadseg segs[/*nsegs*/]; | |
6239 | }; | |
6240 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
6241 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
6242 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
6243 | # endif | |
78d85199 | 6244 | |
78d85199 YQ |
6245 | static int |
6246 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
6247 | unsigned char *myaddr, unsigned int len) | |
6248 | { | |
0bfdf32f | 6249 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
6250 | int addr = -1; |
6251 | struct target_loadmap *data = NULL; | |
6252 | unsigned int actual_length, copy_length; | |
6253 | ||
6254 | if (strcmp (annex, "exec") == 0) | |
723b724b | 6255 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 6256 | else if (strcmp (annex, "interp") == 0) |
723b724b | 6257 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
6258 | else |
6259 | return -1; | |
6260 | ||
723b724b | 6261 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
6262 | return -1; |
6263 | ||
6264 | if (data == NULL) | |
6265 | return -1; | |
6266 | ||
6267 | actual_length = sizeof (struct target_loadmap) | |
6268 | + sizeof (struct target_loadseg) * data->nsegs; | |
6269 | ||
6270 | if (offset < 0 || offset > actual_length) | |
6271 | return -1; | |
6272 | ||
6273 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
6274 | memcpy (myaddr, (char *) data + offset, copy_length); | |
6275 | return copy_length; | |
6276 | } | |
723b724b MF |
6277 | #else |
6278 | # define linux_read_loadmap NULL | |
6279 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 6280 | |
1570b33e | 6281 | static void |
06e03fff | 6282 | linux_process_qsupported (char **features, int count) |
1570b33e L |
6283 | { |
6284 | if (the_low_target.process_qsupported != NULL) | |
06e03fff | 6285 | the_low_target.process_qsupported (features, count); |
1570b33e L |
6286 | } |
6287 | ||
219f2f23 PA |
6288 | static int |
6289 | linux_supports_tracepoints (void) | |
6290 | { | |
6291 | if (*the_low_target.supports_tracepoints == NULL) | |
6292 | return 0; | |
6293 | ||
6294 | return (*the_low_target.supports_tracepoints) (); | |
6295 | } | |
6296 | ||
6297 | static CORE_ADDR | |
6298 | linux_read_pc (struct regcache *regcache) | |
6299 | { | |
6300 | if (the_low_target.get_pc == NULL) | |
6301 | return 0; | |
6302 | ||
6303 | return (*the_low_target.get_pc) (regcache); | |
6304 | } | |
6305 | ||
6306 | static void | |
6307 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
6308 | { | |
6309 | gdb_assert (the_low_target.set_pc != NULL); | |
6310 | ||
6311 | (*the_low_target.set_pc) (regcache, pc); | |
6312 | } | |
6313 | ||
8336d594 PA |
6314 | static int |
6315 | linux_thread_stopped (struct thread_info *thread) | |
6316 | { | |
6317 | return get_thread_lwp (thread)->stopped; | |
6318 | } | |
6319 | ||
6320 | /* This exposes stop-all-threads functionality to other modules. */ | |
6321 | ||
6322 | static void | |
7984d532 | 6323 | linux_pause_all (int freeze) |
8336d594 | 6324 | { |
7984d532 PA |
6325 | stop_all_lwps (freeze, NULL); |
6326 | } | |
6327 | ||
6328 | /* This exposes unstop-all-threads functionality to other gdbserver | |
6329 | modules. */ | |
6330 | ||
6331 | static void | |
6332 | linux_unpause_all (int unfreeze) | |
6333 | { | |
6334 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
6335 | } |
6336 | ||
90d74c30 PA |
6337 | static int |
6338 | linux_prepare_to_access_memory (void) | |
6339 | { | |
6340 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6341 | running LWP. */ | |
6342 | if (non_stop) | |
6343 | linux_pause_all (1); | |
6344 | return 0; | |
6345 | } | |
6346 | ||
6347 | static void | |
0146f85b | 6348 | linux_done_accessing_memory (void) |
90d74c30 PA |
6349 | { |
6350 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6351 | running LWP. */ | |
6352 | if (non_stop) | |
6353 | linux_unpause_all (1); | |
6354 | } | |
6355 | ||
fa593d66 PA |
6356 | static int |
6357 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
6358 | CORE_ADDR collector, | |
6359 | CORE_ADDR lockaddr, | |
6360 | ULONGEST orig_size, | |
6361 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
6362 | CORE_ADDR *trampoline, |
6363 | ULONGEST *trampoline_size, | |
fa593d66 PA |
6364 | unsigned char *jjump_pad_insn, |
6365 | ULONGEST *jjump_pad_insn_size, | |
6366 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
6367 | CORE_ADDR *adjusted_insn_addr_end, |
6368 | char *err) | |
fa593d66 PA |
6369 | { |
6370 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
6371 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
6372 | jump_entry, trampoline, trampoline_size, |
6373 | jjump_pad_insn, jjump_pad_insn_size, | |
6374 | adjusted_insn_addr, adjusted_insn_addr_end, | |
6375 | err); | |
fa593d66 PA |
6376 | } |
6377 | ||
6a271cae PA |
6378 | static struct emit_ops * |
6379 | linux_emit_ops (void) | |
6380 | { | |
6381 | if (the_low_target.emit_ops != NULL) | |
6382 | return (*the_low_target.emit_ops) (); | |
6383 | else | |
6384 | return NULL; | |
6385 | } | |
6386 | ||
405f8e94 SS |
6387 | static int |
6388 | linux_get_min_fast_tracepoint_insn_len (void) | |
6389 | { | |
6390 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
6391 | } | |
6392 | ||
2268b414 JK |
6393 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
6394 | ||
6395 | static int | |
6396 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
6397 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
6398 | { | |
6399 | char filename[PATH_MAX]; | |
6400 | int fd; | |
6401 | const int auxv_size = is_elf64 | |
6402 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
6403 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
6404 | ||
6405 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
6406 | ||
6407 | fd = open (filename, O_RDONLY); | |
6408 | if (fd < 0) | |
6409 | return 1; | |
6410 | ||
6411 | *phdr_memaddr = 0; | |
6412 | *num_phdr = 0; | |
6413 | while (read (fd, buf, auxv_size) == auxv_size | |
6414 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6415 | { | |
6416 | if (is_elf64) | |
6417 | { | |
6418 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6419 | ||
6420 | switch (aux->a_type) | |
6421 | { | |
6422 | case AT_PHDR: | |
6423 | *phdr_memaddr = aux->a_un.a_val; | |
6424 | break; | |
6425 | case AT_PHNUM: | |
6426 | *num_phdr = aux->a_un.a_val; | |
6427 | break; | |
6428 | } | |
6429 | } | |
6430 | else | |
6431 | { | |
6432 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6433 | ||
6434 | switch (aux->a_type) | |
6435 | { | |
6436 | case AT_PHDR: | |
6437 | *phdr_memaddr = aux->a_un.a_val; | |
6438 | break; | |
6439 | case AT_PHNUM: | |
6440 | *num_phdr = aux->a_un.a_val; | |
6441 | break; | |
6442 | } | |
6443 | } | |
6444 | } | |
6445 | ||
6446 | close (fd); | |
6447 | ||
6448 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6449 | { | |
6450 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6451 | "phdr_memaddr = %ld, phdr_num = %d", | |
6452 | (long) *phdr_memaddr, *num_phdr); | |
6453 | return 2; | |
6454 | } | |
6455 | ||
6456 | return 0; | |
6457 | } | |
6458 | ||
6459 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6460 | ||
6461 | static CORE_ADDR | |
6462 | get_dynamic (const int pid, const int is_elf64) | |
6463 | { | |
6464 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6465 | int num_phdr, i; |
2268b414 | 6466 | unsigned char *phdr_buf; |
db1ff28b | 6467 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6468 | |
6469 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6470 | return 0; | |
6471 | ||
6472 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
224c3ddb | 6473 | phdr_buf = (unsigned char *) alloca (num_phdr * phdr_size); |
2268b414 JK |
6474 | |
6475 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6476 | return 0; | |
6477 | ||
6478 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6479 | non-zero for PIE ones. */ | |
6480 | relocation = -1; | |
db1ff28b JK |
6481 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6482 | if (is_elf64) | |
6483 | { | |
6484 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6485 | ||
6486 | if (p->p_type == PT_PHDR) | |
6487 | relocation = phdr_memaddr - p->p_vaddr; | |
6488 | } | |
6489 | else | |
6490 | { | |
6491 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6492 | ||
6493 | if (p->p_type == PT_PHDR) | |
6494 | relocation = phdr_memaddr - p->p_vaddr; | |
6495 | } | |
6496 | ||
2268b414 JK |
6497 | if (relocation == -1) |
6498 | { | |
e237a7e2 JK |
6499 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6500 | any real world executables, including PIE executables, have always | |
6501 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6502 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6503 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6504 | ||
6505 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6506 | ||
6507 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6508 | ||
2268b414 JK |
6509 | return 0; |
6510 | } | |
6511 | ||
db1ff28b JK |
6512 | for (i = 0; i < num_phdr; i++) |
6513 | { | |
6514 | if (is_elf64) | |
6515 | { | |
6516 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6517 | ||
6518 | if (p->p_type == PT_DYNAMIC) | |
6519 | return p->p_vaddr + relocation; | |
6520 | } | |
6521 | else | |
6522 | { | |
6523 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6524 | |
db1ff28b JK |
6525 | if (p->p_type == PT_DYNAMIC) |
6526 | return p->p_vaddr + relocation; | |
6527 | } | |
6528 | } | |
2268b414 JK |
6529 | |
6530 | return 0; | |
6531 | } | |
6532 | ||
6533 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6534 | can be 0 if the inferior does not yet have the library list initialized. |
6535 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6536 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6537 | |
6538 | static CORE_ADDR | |
6539 | get_r_debug (const int pid, const int is_elf64) | |
6540 | { | |
6541 | CORE_ADDR dynamic_memaddr; | |
6542 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6543 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6544 | CORE_ADDR map = -1; |
2268b414 JK |
6545 | |
6546 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6547 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6548 | return map; |
2268b414 JK |
6549 | |
6550 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6551 | { | |
6552 | if (is_elf64) | |
6553 | { | |
6554 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
a738da3a | 6555 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6556 | union |
6557 | { | |
6558 | Elf64_Xword map; | |
6559 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6560 | } | |
6561 | rld_map; | |
a738da3a MF |
6562 | #endif |
6563 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6564 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6565 | { | |
6566 | if (linux_read_memory (dyn->d_un.d_val, | |
6567 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6568 | return rld_map.map; | |
6569 | else | |
6570 | break; | |
6571 | } | |
75f62ce7 | 6572 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6573 | #ifdef DT_MIPS_RLD_MAP_REL |
6574 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6575 | { | |
6576 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6577 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6578 | return rld_map.map; | |
6579 | else | |
6580 | break; | |
6581 | } | |
6582 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6583 | |
367ba2c2 MR |
6584 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6585 | map = dyn->d_un.d_val; | |
2268b414 JK |
6586 | |
6587 | if (dyn->d_tag == DT_NULL) | |
6588 | break; | |
6589 | } | |
6590 | else | |
6591 | { | |
6592 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
a738da3a | 6593 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6594 | union |
6595 | { | |
6596 | Elf32_Word map; | |
6597 | unsigned char buf[sizeof (Elf32_Word)]; | |
6598 | } | |
6599 | rld_map; | |
a738da3a MF |
6600 | #endif |
6601 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6602 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6603 | { | |
6604 | if (linux_read_memory (dyn->d_un.d_val, | |
6605 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6606 | return rld_map.map; | |
6607 | else | |
6608 | break; | |
6609 | } | |
75f62ce7 | 6610 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6611 | #ifdef DT_MIPS_RLD_MAP_REL |
6612 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6613 | { | |
6614 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6615 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6616 | return rld_map.map; | |
6617 | else | |
6618 | break; | |
6619 | } | |
6620 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6621 | |
367ba2c2 MR |
6622 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6623 | map = dyn->d_un.d_val; | |
2268b414 JK |
6624 | |
6625 | if (dyn->d_tag == DT_NULL) | |
6626 | break; | |
6627 | } | |
6628 | ||
6629 | dynamic_memaddr += dyn_size; | |
6630 | } | |
6631 | ||
367ba2c2 | 6632 | return map; |
2268b414 JK |
6633 | } |
6634 | ||
6635 | /* Read one pointer from MEMADDR in the inferior. */ | |
6636 | ||
6637 | static int | |
6638 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
6639 | { | |
485f1ee4 PA |
6640 | int ret; |
6641 | ||
6642 | /* Go through a union so this works on either big or little endian | |
6643 | hosts, when the inferior's pointer size is smaller than the size | |
6644 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
6645 | same of the superior's. */ | |
6646 | union | |
6647 | { | |
6648 | CORE_ADDR core_addr; | |
6649 | unsigned int ui; | |
6650 | unsigned char uc; | |
6651 | } addr; | |
6652 | ||
6653 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
6654 | if (ret == 0) | |
6655 | { | |
6656 | if (ptr_size == sizeof (CORE_ADDR)) | |
6657 | *ptr = addr.core_addr; | |
6658 | else if (ptr_size == sizeof (unsigned int)) | |
6659 | *ptr = addr.ui; | |
6660 | else | |
6661 | gdb_assert_not_reached ("unhandled pointer size"); | |
6662 | } | |
6663 | return ret; | |
2268b414 JK |
6664 | } |
6665 | ||
6666 | struct link_map_offsets | |
6667 | { | |
6668 | /* Offset and size of r_debug.r_version. */ | |
6669 | int r_version_offset; | |
6670 | ||
6671 | /* Offset and size of r_debug.r_map. */ | |
6672 | int r_map_offset; | |
6673 | ||
6674 | /* Offset to l_addr field in struct link_map. */ | |
6675 | int l_addr_offset; | |
6676 | ||
6677 | /* Offset to l_name field in struct link_map. */ | |
6678 | int l_name_offset; | |
6679 | ||
6680 | /* Offset to l_ld field in struct link_map. */ | |
6681 | int l_ld_offset; | |
6682 | ||
6683 | /* Offset to l_next field in struct link_map. */ | |
6684 | int l_next_offset; | |
6685 | ||
6686 | /* Offset to l_prev field in struct link_map. */ | |
6687 | int l_prev_offset; | |
6688 | }; | |
6689 | ||
fb723180 | 6690 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
6691 | |
6692 | static int | |
6693 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
6694 | unsigned const char *writebuf, | |
6695 | CORE_ADDR offset, int len) | |
6696 | { | |
6697 | char *document; | |
6698 | unsigned document_len; | |
fe978cb0 | 6699 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
6700 | char filename[PATH_MAX]; |
6701 | int pid, is_elf64; | |
6702 | ||
6703 | static const struct link_map_offsets lmo_32bit_offsets = | |
6704 | { | |
6705 | 0, /* r_version offset. */ | |
6706 | 4, /* r_debug.r_map offset. */ | |
6707 | 0, /* l_addr offset in link_map. */ | |
6708 | 4, /* l_name offset in link_map. */ | |
6709 | 8, /* l_ld offset in link_map. */ | |
6710 | 12, /* l_next offset in link_map. */ | |
6711 | 16 /* l_prev offset in link_map. */ | |
6712 | }; | |
6713 | ||
6714 | static const struct link_map_offsets lmo_64bit_offsets = | |
6715 | { | |
6716 | 0, /* r_version offset. */ | |
6717 | 8, /* r_debug.r_map offset. */ | |
6718 | 0, /* l_addr offset in link_map. */ | |
6719 | 8, /* l_name offset in link_map. */ | |
6720 | 16, /* l_ld offset in link_map. */ | |
6721 | 24, /* l_next offset in link_map. */ | |
6722 | 32 /* l_prev offset in link_map. */ | |
6723 | }; | |
6724 | const struct link_map_offsets *lmo; | |
214d508e | 6725 | unsigned int machine; |
b1fbec62 GB |
6726 | int ptr_size; |
6727 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
6728 | int allocated = 1024; | |
6729 | char *p; | |
6730 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
6731 | int header_done = 0; | |
2268b414 JK |
6732 | |
6733 | if (writebuf != NULL) | |
6734 | return -2; | |
6735 | if (readbuf == NULL) | |
6736 | return -1; | |
6737 | ||
0bfdf32f | 6738 | pid = lwpid_of (current_thread); |
2268b414 | 6739 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 6740 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 6741 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 6742 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 6743 | |
b1fbec62 GB |
6744 | while (annex[0] != '\0') |
6745 | { | |
6746 | const char *sep; | |
6747 | CORE_ADDR *addrp; | |
6748 | int len; | |
2268b414 | 6749 | |
b1fbec62 GB |
6750 | sep = strchr (annex, '='); |
6751 | if (sep == NULL) | |
6752 | break; | |
0c5bf5a9 | 6753 | |
b1fbec62 | 6754 | len = sep - annex; |
61012eef | 6755 | if (len == 5 && startswith (annex, "start")) |
b1fbec62 | 6756 | addrp = &lm_addr; |
61012eef | 6757 | else if (len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
6758 | addrp = &lm_prev; |
6759 | else | |
6760 | { | |
6761 | annex = strchr (sep, ';'); | |
6762 | if (annex == NULL) | |
6763 | break; | |
6764 | annex++; | |
6765 | continue; | |
6766 | } | |
6767 | ||
6768 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 6769 | } |
b1fbec62 GB |
6770 | |
6771 | if (lm_addr == 0) | |
2268b414 | 6772 | { |
b1fbec62 GB |
6773 | int r_version = 0; |
6774 | ||
6775 | if (priv->r_debug == 0) | |
6776 | priv->r_debug = get_r_debug (pid, is_elf64); | |
6777 | ||
6778 | /* We failed to find DT_DEBUG. Such situation will not change | |
6779 | for this inferior - do not retry it. Report it to GDB as | |
6780 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
6781 | if (priv->r_debug == (CORE_ADDR) -1) | |
6782 | return -1; | |
6783 | ||
6784 | if (priv->r_debug != 0) | |
2268b414 | 6785 | { |
b1fbec62 GB |
6786 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
6787 | (unsigned char *) &r_version, | |
6788 | sizeof (r_version)) != 0 | |
6789 | || r_version != 1) | |
6790 | { | |
6791 | warning ("unexpected r_debug version %d", r_version); | |
6792 | } | |
6793 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
6794 | &lm_addr, ptr_size) != 0) | |
6795 | { | |
6796 | warning ("unable to read r_map from 0x%lx", | |
6797 | (long) priv->r_debug + lmo->r_map_offset); | |
6798 | } | |
2268b414 | 6799 | } |
b1fbec62 | 6800 | } |
2268b414 | 6801 | |
224c3ddb | 6802 | document = (char *) xmalloc (allocated); |
b1fbec62 GB |
6803 | strcpy (document, "<library-list-svr4 version=\"1.0\""); |
6804 | p = document + strlen (document); | |
6805 | ||
6806 | while (lm_addr | |
6807 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
6808 | &l_name, ptr_size) == 0 | |
6809 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
6810 | &l_addr, ptr_size) == 0 | |
6811 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
6812 | &l_ld, ptr_size) == 0 | |
6813 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
6814 | &l_prev, ptr_size) == 0 | |
6815 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
6816 | &l_next, ptr_size) == 0) | |
6817 | { | |
6818 | unsigned char libname[PATH_MAX]; | |
6819 | ||
6820 | if (lm_prev != l_prev) | |
2268b414 | 6821 | { |
b1fbec62 GB |
6822 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
6823 | (long) lm_prev, (long) l_prev); | |
6824 | break; | |
2268b414 JK |
6825 | } |
6826 | ||
d878444c JK |
6827 | /* Ignore the first entry even if it has valid name as the first entry |
6828 | corresponds to the main executable. The first entry should not be | |
6829 | skipped if the dynamic loader was loaded late by a static executable | |
6830 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
6831 | executable does not have PT_DYNAMIC present and this function already | |
6832 | exited above due to failed get_r_debug. */ | |
6833 | if (lm_prev == 0) | |
2268b414 | 6834 | { |
d878444c JK |
6835 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
6836 | p = p + strlen (p); | |
6837 | } | |
6838 | else | |
6839 | { | |
6840 | /* Not checking for error because reading may stop before | |
6841 | we've got PATH_MAX worth of characters. */ | |
6842 | libname[0] = '\0'; | |
6843 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
6844 | libname[sizeof (libname) - 1] = '\0'; | |
6845 | if (libname[0] != '\0') | |
2268b414 | 6846 | { |
d878444c JK |
6847 | /* 6x the size for xml_escape_text below. */ |
6848 | size_t len = 6 * strlen ((char *) libname); | |
6849 | char *name; | |
2268b414 | 6850 | |
d878444c JK |
6851 | if (!header_done) |
6852 | { | |
6853 | /* Terminate `<library-list-svr4'. */ | |
6854 | *p++ = '>'; | |
6855 | header_done = 1; | |
6856 | } | |
2268b414 | 6857 | |
db1ff28b | 6858 | while (allocated < p - document + len + 200) |
d878444c JK |
6859 | { |
6860 | /* Expand to guarantee sufficient storage. */ | |
6861 | uintptr_t document_len = p - document; | |
2268b414 | 6862 | |
224c3ddb | 6863 | document = (char *) xrealloc (document, 2 * allocated); |
d878444c JK |
6864 | allocated *= 2; |
6865 | p = document + document_len; | |
6866 | } | |
6867 | ||
6868 | name = xml_escape_text ((char *) libname); | |
6869 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
db1ff28b | 6870 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", |
d878444c JK |
6871 | name, (unsigned long) lm_addr, |
6872 | (unsigned long) l_addr, (unsigned long) l_ld); | |
6873 | free (name); | |
6874 | } | |
0afae3cf | 6875 | } |
b1fbec62 GB |
6876 | |
6877 | lm_prev = lm_addr; | |
6878 | lm_addr = l_next; | |
2268b414 JK |
6879 | } |
6880 | ||
b1fbec62 GB |
6881 | if (!header_done) |
6882 | { | |
6883 | /* Empty list; terminate `<library-list-svr4'. */ | |
6884 | strcpy (p, "/>"); | |
6885 | } | |
6886 | else | |
6887 | strcpy (p, "</library-list-svr4>"); | |
6888 | ||
2268b414 JK |
6889 | document_len = strlen (document); |
6890 | if (offset < document_len) | |
6891 | document_len -= offset; | |
6892 | else | |
6893 | document_len = 0; | |
6894 | if (len > document_len) | |
6895 | len = document_len; | |
6896 | ||
6897 | memcpy (readbuf, document + offset, len); | |
6898 | xfree (document); | |
6899 | ||
6900 | return len; | |
6901 | } | |
6902 | ||
9accd112 MM |
6903 | #ifdef HAVE_LINUX_BTRACE |
6904 | ||
969c39fb | 6905 | /* See to_disable_btrace target method. */ |
9accd112 | 6906 | |
969c39fb MM |
6907 | static int |
6908 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
6909 | { | |
6910 | enum btrace_error err; | |
6911 | ||
6912 | err = linux_disable_btrace (tinfo); | |
6913 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
6914 | } | |
6915 | ||
bc504a31 | 6916 | /* Encode an Intel Processor Trace configuration. */ |
b20a6524 MM |
6917 | |
6918 | static void | |
6919 | linux_low_encode_pt_config (struct buffer *buffer, | |
6920 | const struct btrace_data_pt_config *config) | |
6921 | { | |
6922 | buffer_grow_str (buffer, "<pt-config>\n"); | |
6923 | ||
6924 | switch (config->cpu.vendor) | |
6925 | { | |
6926 | case CV_INTEL: | |
6927 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
6928 | "model=\"%u\" stepping=\"%u\"/>\n", | |
6929 | config->cpu.family, config->cpu.model, | |
6930 | config->cpu.stepping); | |
6931 | break; | |
6932 | ||
6933 | default: | |
6934 | break; | |
6935 | } | |
6936 | ||
6937 | buffer_grow_str (buffer, "</pt-config>\n"); | |
6938 | } | |
6939 | ||
6940 | /* Encode a raw buffer. */ | |
6941 | ||
6942 | static void | |
6943 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
6944 | unsigned int size) | |
6945 | { | |
6946 | if (size == 0) | |
6947 | return; | |
6948 | ||
6949 | /* We use hex encoding - see common/rsp-low.h. */ | |
6950 | buffer_grow_str (buffer, "<raw>\n"); | |
6951 | ||
6952 | while (size-- > 0) | |
6953 | { | |
6954 | char elem[2]; | |
6955 | ||
6956 | elem[0] = tohex ((*data >> 4) & 0xf); | |
6957 | elem[1] = tohex (*data++ & 0xf); | |
6958 | ||
6959 | buffer_grow (buffer, elem, 2); | |
6960 | } | |
6961 | ||
6962 | buffer_grow_str (buffer, "</raw>\n"); | |
6963 | } | |
6964 | ||
969c39fb MM |
6965 | /* See to_read_btrace target method. */ |
6966 | ||
6967 | static int | |
9accd112 | 6968 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
add67df8 | 6969 | enum btrace_read_type type) |
9accd112 | 6970 | { |
734b0e4b | 6971 | struct btrace_data btrace; |
9accd112 | 6972 | struct btrace_block *block; |
969c39fb | 6973 | enum btrace_error err; |
9accd112 MM |
6974 | int i; |
6975 | ||
734b0e4b MM |
6976 | btrace_data_init (&btrace); |
6977 | ||
969c39fb MM |
6978 | err = linux_read_btrace (&btrace, tinfo, type); |
6979 | if (err != BTRACE_ERR_NONE) | |
6980 | { | |
6981 | if (err == BTRACE_ERR_OVERFLOW) | |
6982 | buffer_grow_str0 (buffer, "E.Overflow."); | |
6983 | else | |
6984 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
6985 | ||
b20a6524 | 6986 | goto err; |
969c39fb | 6987 | } |
9accd112 | 6988 | |
734b0e4b MM |
6989 | switch (btrace.format) |
6990 | { | |
6991 | case BTRACE_FORMAT_NONE: | |
6992 | buffer_grow_str0 (buffer, "E.No Trace."); | |
b20a6524 | 6993 | goto err; |
734b0e4b MM |
6994 | |
6995 | case BTRACE_FORMAT_BTS: | |
6996 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6997 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 6998 | |
734b0e4b MM |
6999 | for (i = 0; |
7000 | VEC_iterate (btrace_block_s, btrace.variant.bts.blocks, i, block); | |
7001 | i++) | |
7002 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
7003 | paddress (block->begin), paddress (block->end)); | |
9accd112 | 7004 | |
734b0e4b MM |
7005 | buffer_grow_str0 (buffer, "</btrace>\n"); |
7006 | break; | |
7007 | ||
b20a6524 MM |
7008 | case BTRACE_FORMAT_PT: |
7009 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7010 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
7011 | buffer_grow_str (buffer, "<pt>\n"); | |
7012 | ||
7013 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 7014 | |
b20a6524 MM |
7015 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
7016 | btrace.variant.pt.size); | |
7017 | ||
7018 | buffer_grow_str (buffer, "</pt>\n"); | |
7019 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
7020 | break; | |
7021 | ||
7022 | default: | |
7023 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
7024 | goto err; | |
734b0e4b | 7025 | } |
969c39fb | 7026 | |
734b0e4b | 7027 | btrace_data_fini (&btrace); |
969c39fb | 7028 | return 0; |
b20a6524 MM |
7029 | |
7030 | err: | |
7031 | btrace_data_fini (&btrace); | |
7032 | return -1; | |
9accd112 | 7033 | } |
f4abbc16 MM |
7034 | |
7035 | /* See to_btrace_conf target method. */ | |
7036 | ||
7037 | static int | |
7038 | linux_low_btrace_conf (const struct btrace_target_info *tinfo, | |
7039 | struct buffer *buffer) | |
7040 | { | |
7041 | const struct btrace_config *conf; | |
7042 | ||
7043 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
7044 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
7045 | ||
7046 | conf = linux_btrace_conf (tinfo); | |
7047 | if (conf != NULL) | |
7048 | { | |
7049 | switch (conf->format) | |
7050 | { | |
7051 | case BTRACE_FORMAT_NONE: | |
7052 | break; | |
7053 | ||
7054 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
7055 | buffer_xml_printf (buffer, "<bts"); |
7056 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
7057 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 7058 | break; |
b20a6524 MM |
7059 | |
7060 | case BTRACE_FORMAT_PT: | |
7061 | buffer_xml_printf (buffer, "<pt"); | |
7062 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
7063 | buffer_xml_printf (buffer, "/>\n"); | |
7064 | break; | |
f4abbc16 MM |
7065 | } |
7066 | } | |
7067 | ||
7068 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
7069 | return 0; | |
7070 | } | |
9accd112 MM |
7071 | #endif /* HAVE_LINUX_BTRACE */ |
7072 | ||
7b669087 GB |
7073 | /* See nat/linux-nat.h. */ |
7074 | ||
7075 | ptid_t | |
7076 | current_lwp_ptid (void) | |
7077 | { | |
7078 | return ptid_of (current_thread); | |
7079 | } | |
7080 | ||
dd373349 AT |
7081 | /* Implementation of the target_ops method "breakpoint_kind_from_pc". */ |
7082 | ||
7083 | static int | |
7084 | linux_breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
7085 | { | |
7086 | if (the_low_target.breakpoint_kind_from_pc != NULL) | |
7087 | return (*the_low_target.breakpoint_kind_from_pc) (pcptr); | |
7088 | else | |
1652a986 | 7089 | return default_breakpoint_kind_from_pc (pcptr); |
dd373349 AT |
7090 | } |
7091 | ||
7092 | /* Implementation of the target_ops method "sw_breakpoint_from_kind". */ | |
7093 | ||
7094 | static const gdb_byte * | |
7095 | linux_sw_breakpoint_from_kind (int kind, int *size) | |
7096 | { | |
7097 | gdb_assert (the_low_target.sw_breakpoint_from_kind != NULL); | |
7098 | ||
7099 | return (*the_low_target.sw_breakpoint_from_kind) (kind, size); | |
7100 | } | |
7101 | ||
769ef81f AT |
7102 | /* Implementation of the target_ops method |
7103 | "breakpoint_kind_from_current_state". */ | |
7104 | ||
7105 | static int | |
7106 | linux_breakpoint_kind_from_current_state (CORE_ADDR *pcptr) | |
7107 | { | |
7108 | if (the_low_target.breakpoint_kind_from_current_state != NULL) | |
7109 | return (*the_low_target.breakpoint_kind_from_current_state) (pcptr); | |
7110 | else | |
7111 | return linux_breakpoint_kind_from_pc (pcptr); | |
7112 | } | |
7113 | ||
ce3a066d DJ |
7114 | static struct target_ops linux_target_ops = { |
7115 | linux_create_inferior, | |
ece66d65 | 7116 | linux_post_create_inferior, |
ce3a066d DJ |
7117 | linux_attach, |
7118 | linux_kill, | |
6ad8ae5c | 7119 | linux_detach, |
8336d594 | 7120 | linux_mourn, |
444d6139 | 7121 | linux_join, |
ce3a066d DJ |
7122 | linux_thread_alive, |
7123 | linux_resume, | |
7124 | linux_wait, | |
7125 | linux_fetch_registers, | |
7126 | linux_store_registers, | |
90d74c30 | 7127 | linux_prepare_to_access_memory, |
0146f85b | 7128 | linux_done_accessing_memory, |
ce3a066d DJ |
7129 | linux_read_memory, |
7130 | linux_write_memory, | |
2f2893d9 | 7131 | linux_look_up_symbols, |
ef57601b | 7132 | linux_request_interrupt, |
aa691b87 | 7133 | linux_read_auxv, |
802e8e6d | 7134 | linux_supports_z_point_type, |
d993e290 PA |
7135 | linux_insert_point, |
7136 | linux_remove_point, | |
3e572f71 PA |
7137 | linux_stopped_by_sw_breakpoint, |
7138 | linux_supports_stopped_by_sw_breakpoint, | |
7139 | linux_stopped_by_hw_breakpoint, | |
7140 | linux_supports_stopped_by_hw_breakpoint, | |
70b90b91 | 7141 | linux_supports_hardware_single_step, |
e013ee27 OF |
7142 | linux_stopped_by_watchpoint, |
7143 | linux_stopped_data_address, | |
db0dfaa0 LM |
7144 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
7145 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
7146 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 7147 | linux_read_offsets, |
dae5f5cf DJ |
7148 | #else |
7149 | NULL, | |
7150 | #endif | |
7151 | #ifdef USE_THREAD_DB | |
7152 | thread_db_get_tls_address, | |
7153 | #else | |
7154 | NULL, | |
52fb6437 | 7155 | #endif |
efcbbd14 | 7156 | linux_qxfer_spu, |
59a016f0 | 7157 | hostio_last_error_from_errno, |
07e059b5 | 7158 | linux_qxfer_osdata, |
4aa995e1 | 7159 | linux_xfer_siginfo, |
bd99dc85 PA |
7160 | linux_supports_non_stop, |
7161 | linux_async, | |
7162 | linux_start_non_stop, | |
cdbfd419 | 7163 | linux_supports_multi_process, |
89245bc0 DB |
7164 | linux_supports_fork_events, |
7165 | linux_supports_vfork_events, | |
94585166 | 7166 | linux_supports_exec_events, |
de0d863e | 7167 | linux_handle_new_gdb_connection, |
cdbfd419 | 7168 | #ifdef USE_THREAD_DB |
dc146f7c | 7169 | thread_db_handle_monitor_command, |
cdbfd419 | 7170 | #else |
dc146f7c | 7171 | NULL, |
cdbfd419 | 7172 | #endif |
d26e3629 | 7173 | linux_common_core_of_thread, |
78d85199 | 7174 | linux_read_loadmap, |
219f2f23 PA |
7175 | linux_process_qsupported, |
7176 | linux_supports_tracepoints, | |
7177 | linux_read_pc, | |
8336d594 PA |
7178 | linux_write_pc, |
7179 | linux_thread_stopped, | |
7984d532 | 7180 | NULL, |
711e434b | 7181 | linux_pause_all, |
7984d532 | 7182 | linux_unpause_all, |
fa593d66 | 7183 | linux_stabilize_threads, |
6a271cae | 7184 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
7185 | linux_emit_ops, |
7186 | linux_supports_disable_randomization, | |
405f8e94 | 7187 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 7188 | linux_qxfer_libraries_svr4, |
d1feda86 | 7189 | linux_supports_agent, |
9accd112 MM |
7190 | #ifdef HAVE_LINUX_BTRACE |
7191 | linux_supports_btrace, | |
0568462b | 7192 | linux_enable_btrace, |
969c39fb | 7193 | linux_low_disable_btrace, |
9accd112 | 7194 | linux_low_read_btrace, |
f4abbc16 | 7195 | linux_low_btrace_conf, |
9accd112 MM |
7196 | #else |
7197 | NULL, | |
7198 | NULL, | |
7199 | NULL, | |
7200 | NULL, | |
f4abbc16 | 7201 | NULL, |
9accd112 | 7202 | #endif |
c2d6af84 | 7203 | linux_supports_range_stepping, |
e57f1de3 | 7204 | linux_proc_pid_to_exec_file, |
14d2069a GB |
7205 | linux_mntns_open_cloexec, |
7206 | linux_mntns_unlink, | |
7207 | linux_mntns_readlink, | |
dd373349 | 7208 | linux_breakpoint_kind_from_pc, |
79efa585 SM |
7209 | linux_sw_breakpoint_from_kind, |
7210 | linux_proc_tid_get_name, | |
7d00775e AT |
7211 | linux_breakpoint_kind_from_current_state, |
7212 | linux_supports_software_single_step | |
ce3a066d DJ |
7213 | }; |
7214 | ||
3aee8918 PA |
7215 | #ifdef HAVE_LINUX_REGSETS |
7216 | void | |
7217 | initialize_regsets_info (struct regsets_info *info) | |
7218 | { | |
7219 | for (info->num_regsets = 0; | |
7220 | info->regsets[info->num_regsets].size >= 0; | |
7221 | info->num_regsets++) | |
7222 | ; | |
3aee8918 PA |
7223 | } |
7224 | #endif | |
7225 | ||
da6d8c04 DJ |
7226 | void |
7227 | initialize_low (void) | |
7228 | { | |
bd99dc85 | 7229 | struct sigaction sigchld_action; |
dd373349 | 7230 | |
bd99dc85 | 7231 | memset (&sigchld_action, 0, sizeof (sigchld_action)); |
ce3a066d | 7232 | set_target_ops (&linux_target_ops); |
dd373349 | 7233 | |
aa7c7447 | 7234 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
7235 | |
7236 | sigchld_action.sa_handler = sigchld_handler; | |
7237 | sigemptyset (&sigchld_action.sa_mask); | |
7238 | sigchld_action.sa_flags = SA_RESTART; | |
7239 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
7240 | |
7241 | initialize_low_arch (); | |
89245bc0 DB |
7242 | |
7243 | linux_check_ptrace_features (); | |
da6d8c04 | 7244 | } |