Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
32d0add0 | 2 | Copyright (C) 1995-2015 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" |
700ca40f | 25 | #include "nat/linux-maps.h" |
da6d8c04 | 26 | |
96d7229d LM |
27 | #include "nat/linux-nat.h" |
28 | #include "nat/linux-waitpid.h" | |
8bdce1ff | 29 | #include "gdb_wait.h" |
da6d8c04 | 30 | #include <sys/ptrace.h> |
125f8a3d GB |
31 | #include "nat/linux-ptrace.h" |
32 | #include "nat/linux-procfs.h" | |
8cc73a39 | 33 | #include "nat/linux-personality.h" |
da6d8c04 DJ |
34 | #include <signal.h> |
35 | #include <sys/ioctl.h> | |
36 | #include <fcntl.h> | |
0a30fbc4 | 37 | #include <unistd.h> |
fd500816 | 38 | #include <sys/syscall.h> |
f9387fc3 | 39 | #include <sched.h> |
07e059b5 VP |
40 | #include <ctype.h> |
41 | #include <pwd.h> | |
42 | #include <sys/types.h> | |
43 | #include <dirent.h> | |
53ce3c39 | 44 | #include <sys/stat.h> |
efcbbd14 | 45 | #include <sys/vfs.h> |
1570b33e | 46 | #include <sys/uio.h> |
700ca40f | 47 | #include <search.h> |
602e3198 | 48 | #include "filestuff.h" |
c144c7a0 | 49 | #include "tracepoint.h" |
533b0600 | 50 | #include "hostio.h" |
700ca40f | 51 | #include "rsp-low.h" |
957f3f49 DE |
52 | #ifndef ELFMAG0 |
53 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
54 | then ELFMAG0 will have been defined. If it didn't get included by | |
55 | gdb_proc_service.h then including it will likely introduce a duplicate | |
56 | definition of elf_fpregset_t. */ | |
57 | #include <elf.h> | |
58 | #endif | |
14d2069a | 59 | #include "nat/linux-namespaces.h" |
efcbbd14 UW |
60 | |
61 | #ifndef SPUFS_MAGIC | |
62 | #define SPUFS_MAGIC 0x23c9b64e | |
63 | #endif | |
da6d8c04 | 64 | |
03583c20 UW |
65 | #ifdef HAVE_PERSONALITY |
66 | # include <sys/personality.h> | |
67 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
68 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
69 | # endif | |
70 | #endif | |
71 | ||
fd462a61 DJ |
72 | #ifndef O_LARGEFILE |
73 | #define O_LARGEFILE 0 | |
74 | #endif | |
75 | ||
ec8ebe72 DE |
76 | #ifndef W_STOPCODE |
77 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
78 | #endif | |
79 | ||
1a981360 PA |
80 | /* This is the kernel's hard limit. Not to be confused with |
81 | SIGRTMIN. */ | |
82 | #ifndef __SIGRTMIN | |
83 | #define __SIGRTMIN 32 | |
84 | #endif | |
85 | ||
db0dfaa0 LM |
86 | /* Some targets did not define these ptrace constants from the start, |
87 | so gdbserver defines them locally here. In the future, these may | |
88 | be removed after they are added to asm/ptrace.h. */ | |
89 | #if !(defined(PT_TEXT_ADDR) \ | |
90 | || defined(PT_DATA_ADDR) \ | |
91 | || defined(PT_TEXT_END_ADDR)) | |
92 | #if defined(__mcoldfire__) | |
93 | /* These are still undefined in 3.10 kernels. */ | |
94 | #define PT_TEXT_ADDR 49*4 | |
95 | #define PT_DATA_ADDR 50*4 | |
96 | #define PT_TEXT_END_ADDR 51*4 | |
97 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
98 | #elif defined(BFIN) | |
99 | #define PT_TEXT_ADDR 220 | |
100 | #define PT_TEXT_END_ADDR 224 | |
101 | #define PT_DATA_ADDR 228 | |
102 | /* These are still undefined in 3.10 kernels. */ | |
103 | #elif defined(__TMS320C6X__) | |
104 | #define PT_TEXT_ADDR (0x10000*4) | |
105 | #define PT_DATA_ADDR (0x10004*4) | |
106 | #define PT_TEXT_END_ADDR (0x10008*4) | |
107 | #endif | |
108 | #endif | |
109 | ||
9accd112 | 110 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 111 | # include "nat/linux-btrace.h" |
734b0e4b | 112 | # include "btrace-common.h" |
9accd112 MM |
113 | #endif |
114 | ||
8365dcf5 TJB |
115 | #ifndef HAVE_ELF32_AUXV_T |
116 | /* Copied from glibc's elf.h. */ | |
117 | typedef struct | |
118 | { | |
119 | uint32_t a_type; /* Entry type */ | |
120 | union | |
121 | { | |
122 | uint32_t a_val; /* Integer value */ | |
123 | /* We use to have pointer elements added here. We cannot do that, | |
124 | though, since it does not work when using 32-bit definitions | |
125 | on 64-bit platforms and vice versa. */ | |
126 | } a_un; | |
127 | } Elf32_auxv_t; | |
128 | #endif | |
129 | ||
130 | #ifndef HAVE_ELF64_AUXV_T | |
131 | /* Copied from glibc's elf.h. */ | |
132 | typedef struct | |
133 | { | |
134 | uint64_t a_type; /* Entry type */ | |
135 | union | |
136 | { | |
137 | uint64_t a_val; /* Integer value */ | |
138 | /* We use to have pointer elements added here. We cannot do that, | |
139 | though, since it does not work when using 32-bit definitions | |
140 | on 64-bit platforms and vice versa. */ | |
141 | } a_un; | |
142 | } Elf64_auxv_t; | |
143 | #endif | |
144 | ||
cff068da GB |
145 | /* LWP accessors. */ |
146 | ||
147 | /* See nat/linux-nat.h. */ | |
148 | ||
149 | ptid_t | |
150 | ptid_of_lwp (struct lwp_info *lwp) | |
151 | { | |
152 | return ptid_of (get_lwp_thread (lwp)); | |
153 | } | |
154 | ||
155 | /* See nat/linux-nat.h. */ | |
156 | ||
4b134ca1 GB |
157 | void |
158 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
159 | struct arch_lwp_info *info) | |
160 | { | |
161 | lwp->arch_private = info; | |
162 | } | |
163 | ||
164 | /* See nat/linux-nat.h. */ | |
165 | ||
166 | struct arch_lwp_info * | |
167 | lwp_arch_private_info (struct lwp_info *lwp) | |
168 | { | |
169 | return lwp->arch_private; | |
170 | } | |
171 | ||
172 | /* See nat/linux-nat.h. */ | |
173 | ||
cff068da GB |
174 | int |
175 | lwp_is_stopped (struct lwp_info *lwp) | |
176 | { | |
177 | return lwp->stopped; | |
178 | } | |
179 | ||
180 | /* See nat/linux-nat.h. */ | |
181 | ||
182 | enum target_stop_reason | |
183 | lwp_stop_reason (struct lwp_info *lwp) | |
184 | { | |
185 | return lwp->stop_reason; | |
186 | } | |
187 | ||
700ca40f JK |
188 | typedef union ElfXX_Ehdr |
189 | { | |
190 | Elf32_Ehdr _32; | |
191 | Elf64_Ehdr _64; | |
192 | } ElfXX_Ehdr; | |
193 | ||
194 | typedef union ElfXX_Phdr | |
195 | { | |
196 | Elf32_Phdr _32; | |
197 | Elf64_Phdr _64; | |
198 | } ElfXX_Phdr; | |
199 | ||
200 | typedef union ElfXX_Nhdr | |
201 | { | |
202 | Elf32_Nhdr _32; | |
203 | Elf64_Nhdr _64; | |
204 | } ElfXX_Nhdr; | |
205 | ||
206 | #define ELFXX_FLD(elf64, hdr, fld) ((elf64) ? (hdr)._64.fld : (hdr)._32.fld) | |
207 | #define ELFXX_SIZEOF(elf64, hdr) ((elf64) ? sizeof ((hdr)._64) \ | |
208 | : sizeof ((hdr)._32)) | |
209 | /* Round up to next 4 byte boundary. */ | |
210 | #define ELFXX_ROUNDUP_4(elf64, what) (((what) + 3) & ~(ULONGEST) 3) | |
211 | #define BUILD_ID_INVALID "?" | |
212 | ||
05044653 PA |
213 | /* A list of all unknown processes which receive stop signals. Some |
214 | other process will presumably claim each of these as forked | |
215 | children momentarily. */ | |
24a09b5f | 216 | |
05044653 PA |
217 | struct simple_pid_list |
218 | { | |
219 | /* The process ID. */ | |
220 | int pid; | |
221 | ||
222 | /* The status as reported by waitpid. */ | |
223 | int status; | |
224 | ||
225 | /* Next in chain. */ | |
226 | struct simple_pid_list *next; | |
227 | }; | |
228 | struct simple_pid_list *stopped_pids; | |
229 | ||
230 | /* Trivial list manipulation functions to keep track of a list of new | |
231 | stopped processes. */ | |
232 | ||
233 | static void | |
234 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
235 | { | |
236 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
237 | ||
238 | new_pid->pid = pid; | |
239 | new_pid->status = status; | |
240 | new_pid->next = *listp; | |
241 | *listp = new_pid; | |
242 | } | |
243 | ||
244 | static int | |
245 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
246 | { | |
247 | struct simple_pid_list **p; | |
248 | ||
249 | for (p = listp; *p != NULL; p = &(*p)->next) | |
250 | if ((*p)->pid == pid) | |
251 | { | |
252 | struct simple_pid_list *next = (*p)->next; | |
253 | ||
254 | *statusp = (*p)->status; | |
255 | xfree (*p); | |
256 | *p = next; | |
257 | return 1; | |
258 | } | |
259 | return 0; | |
260 | } | |
24a09b5f | 261 | |
bde24c0a PA |
262 | enum stopping_threads_kind |
263 | { | |
264 | /* Not stopping threads presently. */ | |
265 | NOT_STOPPING_THREADS, | |
266 | ||
267 | /* Stopping threads. */ | |
268 | STOPPING_THREADS, | |
269 | ||
270 | /* Stopping and suspending threads. */ | |
271 | STOPPING_AND_SUSPENDING_THREADS | |
272 | }; | |
273 | ||
274 | /* This is set while stop_all_lwps is in effect. */ | |
275 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
276 | |
277 | /* FIXME make into a target method? */ | |
24a09b5f | 278 | int using_threads = 1; |
24a09b5f | 279 | |
fa593d66 PA |
280 | /* True if we're presently stabilizing threads (moving them out of |
281 | jump pads). */ | |
282 | static int stabilizing_threads; | |
283 | ||
2acc282a | 284 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 285 | int step, int signal, siginfo_t *info); |
2bd7c093 | 286 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
287 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
288 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
fa96cb38 PA |
289 | static int linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
290 | int *wstat, int options); | |
95954743 | 291 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
b3312d80 | 292 | static struct lwp_info *add_lwp (ptid_t ptid); |
c35fafde | 293 | static int linux_stopped_by_watchpoint (void); |
95954743 | 294 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 295 | static void proceed_all_lwps (void); |
d50171e4 | 296 | static int finish_step_over (struct lwp_info *lwp); |
d50171e4 PA |
297 | static int kill_lwp (unsigned long lwpid, int signo); |
298 | ||
582511be PA |
299 | /* When the event-loop is doing a step-over, this points at the thread |
300 | being stepped. */ | |
301 | ptid_t step_over_bkpt; | |
302 | ||
d50171e4 PA |
303 | /* True if the low target can hardware single-step. Such targets |
304 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
305 | ||
306 | static int | |
307 | can_hardware_single_step (void) | |
308 | { | |
309 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
310 | } | |
311 | ||
312 | /* True if the low target supports memory breakpoints. If so, we'll | |
313 | have a GET_PC implementation. */ | |
314 | ||
315 | static int | |
316 | supports_breakpoints (void) | |
317 | { | |
318 | return (the_low_target.get_pc != NULL); | |
319 | } | |
0d62e5e8 | 320 | |
fa593d66 PA |
321 | /* Returns true if this target can support fast tracepoints. This |
322 | does not mean that the in-process agent has been loaded in the | |
323 | inferior. */ | |
324 | ||
325 | static int | |
326 | supports_fast_tracepoints (void) | |
327 | { | |
328 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
329 | } | |
330 | ||
c2d6af84 PA |
331 | /* True if LWP is stopped in its stepping range. */ |
332 | ||
333 | static int | |
334 | lwp_in_step_range (struct lwp_info *lwp) | |
335 | { | |
336 | CORE_ADDR pc = lwp->stop_pc; | |
337 | ||
338 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
339 | } | |
340 | ||
0d62e5e8 DJ |
341 | struct pending_signals |
342 | { | |
343 | int signal; | |
32ca6d61 | 344 | siginfo_t info; |
0d62e5e8 DJ |
345 | struct pending_signals *prev; |
346 | }; | |
611cb4a5 | 347 | |
bd99dc85 PA |
348 | /* The read/write ends of the pipe registered as waitable file in the |
349 | event loop. */ | |
350 | static int linux_event_pipe[2] = { -1, -1 }; | |
351 | ||
352 | /* True if we're currently in async mode. */ | |
353 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
354 | ||
02fc4de7 | 355 | static void send_sigstop (struct lwp_info *lwp); |
fa96cb38 | 356 | static void wait_for_sigstop (void); |
bd99dc85 | 357 | |
d0722149 DE |
358 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
359 | ||
360 | static int | |
214d508e | 361 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 362 | { |
214d508e L |
363 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
364 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
365 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
366 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
367 | { | |
368 | *machine = header->e_machine; | |
369 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
370 | ||
371 | } | |
372 | *machine = EM_NONE; | |
373 | return -1; | |
d0722149 DE |
374 | } |
375 | ||
376 | /* Return non-zero if FILE is a 64-bit ELF file, | |
377 | zero if the file is not a 64-bit ELF file, | |
378 | and -1 if the file is not accessible or doesn't exist. */ | |
379 | ||
be07f1a2 | 380 | static int |
214d508e | 381 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 382 | { |
957f3f49 | 383 | Elf64_Ehdr header; |
d0722149 DE |
384 | int fd; |
385 | ||
386 | fd = open (file, O_RDONLY); | |
387 | if (fd < 0) | |
388 | return -1; | |
389 | ||
390 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
391 | { | |
392 | close (fd); | |
393 | return 0; | |
394 | } | |
395 | close (fd); | |
396 | ||
214d508e | 397 | return elf_64_header_p (&header, machine); |
d0722149 DE |
398 | } |
399 | ||
be07f1a2 PA |
400 | /* Accepts an integer PID; Returns true if the executable PID is |
401 | running is a 64-bit ELF file.. */ | |
402 | ||
403 | int | |
214d508e | 404 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 405 | { |
d8d2a3ee | 406 | char file[PATH_MAX]; |
be07f1a2 PA |
407 | |
408 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 409 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
410 | } |
411 | ||
bd99dc85 PA |
412 | static void |
413 | delete_lwp (struct lwp_info *lwp) | |
414 | { | |
fa96cb38 PA |
415 | struct thread_info *thr = get_lwp_thread (lwp); |
416 | ||
417 | if (debug_threads) | |
418 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
419 | ||
420 | remove_thread (thr); | |
aa5ca48f | 421 | free (lwp->arch_private); |
bd99dc85 PA |
422 | free (lwp); |
423 | } | |
424 | ||
95954743 PA |
425 | /* Add a process to the common process list, and set its private |
426 | data. */ | |
427 | ||
428 | static struct process_info * | |
429 | linux_add_process (int pid, int attached) | |
430 | { | |
431 | struct process_info *proc; | |
432 | ||
95954743 | 433 | proc = add_process (pid, attached); |
fe978cb0 | 434 | proc->priv = xcalloc (1, sizeof (*proc->priv)); |
95954743 | 435 | |
3aee8918 | 436 | /* Set the arch when the first LWP stops. */ |
fe978cb0 | 437 | proc->priv->new_inferior = 1; |
3aee8918 | 438 | |
aa5ca48f | 439 | if (the_low_target.new_process != NULL) |
fe978cb0 | 440 | proc->priv->arch_private = the_low_target.new_process (); |
aa5ca48f | 441 | |
95954743 PA |
442 | return proc; |
443 | } | |
444 | ||
582511be PA |
445 | static CORE_ADDR get_pc (struct lwp_info *lwp); |
446 | ||
bd99dc85 | 447 | /* Handle a GNU/Linux extended wait response. If we see a clone |
de0d863e DB |
448 | event, we need to add the new LWP to our list (and return 0 so as |
449 | not to report the trap to higher layers). */ | |
0d62e5e8 | 450 | |
de0d863e DB |
451 | static int |
452 | handle_extended_wait (struct lwp_info *event_lwp, int wstat) | |
24a09b5f | 453 | { |
89a5711c | 454 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 455 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
54a0b537 | 456 | struct lwp_info *new_lwp; |
24a09b5f | 457 | |
c269dbdb DB |
458 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
459 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f | 460 | { |
95954743 | 461 | ptid_t ptid; |
24a09b5f | 462 | unsigned long new_pid; |
05044653 | 463 | int ret, status; |
24a09b5f | 464 | |
de0d863e | 465 | /* Get the pid of the new lwp. */ |
d86d4aaf | 466 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 467 | &new_pid); |
24a09b5f DJ |
468 | |
469 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 470 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
471 | { |
472 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
473 | hits the SIGSTOP, but we're already attached. */ | |
474 | ||
97438e3f | 475 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
476 | |
477 | if (ret == -1) | |
478 | perror_with_name ("waiting for new child"); | |
479 | else if (ret != new_pid) | |
480 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 481 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
482 | warning ("wait returned unexpected status 0x%x", status); |
483 | } | |
484 | ||
c269dbdb | 485 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
de0d863e DB |
486 | { |
487 | struct process_info *parent_proc; | |
488 | struct process_info *child_proc; | |
489 | struct lwp_info *child_lwp; | |
bfacd19d | 490 | struct thread_info *child_thr; |
de0d863e DB |
491 | struct target_desc *tdesc; |
492 | ||
493 | ptid = ptid_build (new_pid, new_pid, 0); | |
494 | ||
495 | if (debug_threads) | |
496 | { | |
497 | debug_printf ("HEW: Got fork event from LWP %ld, " | |
498 | "new child is %d\n", | |
499 | ptid_get_lwp (ptid_of (event_thr)), | |
500 | ptid_get_pid (ptid)); | |
501 | } | |
502 | ||
503 | /* Add the new process to the tables and clone the breakpoint | |
504 | lists of the parent. We need to do this even if the new process | |
505 | will be detached, since we will need the process object and the | |
506 | breakpoints to remove any breakpoints from memory when we | |
507 | detach, and the client side will access registers. */ | |
508 | child_proc = linux_add_process (new_pid, 0); | |
509 | gdb_assert (child_proc != NULL); | |
510 | child_lwp = add_lwp (ptid); | |
511 | gdb_assert (child_lwp != NULL); | |
512 | child_lwp->stopped = 1; | |
bfacd19d DB |
513 | child_lwp->must_set_ptrace_flags = 1; |
514 | child_lwp->status_pending_p = 0; | |
515 | child_thr = get_lwp_thread (child_lwp); | |
516 | child_thr->last_resume_kind = resume_stop; | |
de0d863e DB |
517 | parent_proc = get_thread_process (event_thr); |
518 | child_proc->attached = parent_proc->attached; | |
519 | clone_all_breakpoints (&child_proc->breakpoints, | |
520 | &child_proc->raw_breakpoints, | |
521 | parent_proc->breakpoints); | |
522 | ||
523 | tdesc = xmalloc (sizeof (struct target_desc)); | |
524 | copy_target_description (tdesc, parent_proc->tdesc); | |
525 | child_proc->tdesc = tdesc; | |
de0d863e | 526 | |
3a8a0396 DB |
527 | /* Clone arch-specific process data. */ |
528 | if (the_low_target.new_fork != NULL) | |
529 | the_low_target.new_fork (parent_proc, child_proc); | |
530 | ||
de0d863e | 531 | /* Save fork info in the parent thread. */ |
c269dbdb DB |
532 | if (event == PTRACE_EVENT_FORK) |
533 | event_lwp->waitstatus.kind = TARGET_WAITKIND_FORKED; | |
534 | else if (event == PTRACE_EVENT_VFORK) | |
535 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORKED; | |
536 | ||
de0d863e | 537 | event_lwp->waitstatus.value.related_pid = ptid; |
c269dbdb | 538 | |
de0d863e DB |
539 | /* The status_pending field contains bits denoting the |
540 | extended event, so when the pending event is handled, | |
541 | the handler will look at lwp->waitstatus. */ | |
542 | event_lwp->status_pending_p = 1; | |
543 | event_lwp->status_pending = wstat; | |
544 | ||
545 | /* Report the event. */ | |
546 | return 0; | |
547 | } | |
548 | ||
fa96cb38 PA |
549 | if (debug_threads) |
550 | debug_printf ("HEW: Got clone event " | |
551 | "from LWP %ld, new child is LWP %ld\n", | |
552 | lwpid_of (event_thr), new_pid); | |
553 | ||
d86d4aaf | 554 | ptid = ptid_build (pid_of (event_thr), new_pid, 0); |
b3312d80 | 555 | new_lwp = add_lwp (ptid); |
24a09b5f | 556 | |
e27d73f6 DE |
557 | /* Either we're going to immediately resume the new thread |
558 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
559 | thinks the thread is currently running, so set this first | |
560 | before calling linux_resume_one_lwp. */ | |
561 | new_lwp->stopped = 1; | |
562 | ||
bde24c0a PA |
563 | /* If we're suspending all threads, leave this one suspended |
564 | too. */ | |
565 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
566 | new_lwp->suspended = 1; | |
567 | ||
da5898ce DJ |
568 | /* Normally we will get the pending SIGSTOP. But in some cases |
569 | we might get another signal delivered to the group first. | |
f21cc1a2 | 570 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 571 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 572 | { |
54a0b537 | 573 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
574 | new_lwp->status_pending_p = 1; |
575 | new_lwp->status_pending = status; | |
da5898ce | 576 | } |
de0d863e DB |
577 | |
578 | /* Don't report the event. */ | |
579 | return 1; | |
24a09b5f | 580 | } |
c269dbdb DB |
581 | else if (event == PTRACE_EVENT_VFORK_DONE) |
582 | { | |
583 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
584 | ||
585 | /* Report the event. */ | |
586 | return 0; | |
587 | } | |
de0d863e DB |
588 | |
589 | internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event); | |
24a09b5f DJ |
590 | } |
591 | ||
d50171e4 PA |
592 | /* Return the PC as read from the regcache of LWP, without any |
593 | adjustment. */ | |
594 | ||
595 | static CORE_ADDR | |
596 | get_pc (struct lwp_info *lwp) | |
597 | { | |
0bfdf32f | 598 | struct thread_info *saved_thread; |
d50171e4 PA |
599 | struct regcache *regcache; |
600 | CORE_ADDR pc; | |
601 | ||
602 | if (the_low_target.get_pc == NULL) | |
603 | return 0; | |
604 | ||
0bfdf32f GB |
605 | saved_thread = current_thread; |
606 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 607 | |
0bfdf32f | 608 | regcache = get_thread_regcache (current_thread, 1); |
d50171e4 PA |
609 | pc = (*the_low_target.get_pc) (regcache); |
610 | ||
611 | if (debug_threads) | |
87ce2a04 | 612 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 613 | |
0bfdf32f | 614 | current_thread = saved_thread; |
d50171e4 PA |
615 | return pc; |
616 | } | |
617 | ||
618 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
619 | The SIGTRAP could mean several things. |
620 | ||
621 | On i386, where decr_pc_after_break is non-zero: | |
582511be PA |
622 | |
623 | If we were single-stepping this process using PTRACE_SINGLESTEP, we | |
624 | will get only the one SIGTRAP. The value of $eip will be the next | |
625 | instruction. If the instruction we stepped over was a breakpoint, | |
626 | we need to decrement the PC. | |
627 | ||
0d62e5e8 DJ |
628 | If we continue the process using PTRACE_CONT, we will get a |
629 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
630 | the instruction after the breakpoint (i.e. needs to be | |
631 | decremented). If we report the SIGTRAP to GDB, we must also | |
582511be | 632 | report the undecremented PC. If the breakpoint is removed, we |
0d62e5e8 DJ |
633 | must resume at the decremented PC. |
634 | ||
582511be PA |
635 | On a non-decr_pc_after_break machine with hardware or kernel |
636 | single-step: | |
637 | ||
638 | If we either single-step a breakpoint instruction, or continue and | |
639 | hit a breakpoint instruction, our PC will point at the breakpoint | |
0d62e5e8 DJ |
640 | instruction. */ |
641 | ||
582511be PA |
642 | static int |
643 | check_stopped_by_breakpoint (struct lwp_info *lwp) | |
0d62e5e8 | 644 | { |
582511be PA |
645 | CORE_ADDR pc; |
646 | CORE_ADDR sw_breakpoint_pc; | |
647 | struct thread_info *saved_thread; | |
3e572f71 PA |
648 | #if USE_SIGTRAP_SIGINFO |
649 | siginfo_t siginfo; | |
650 | #endif | |
d50171e4 PA |
651 | |
652 | if (the_low_target.get_pc == NULL) | |
653 | return 0; | |
0d62e5e8 | 654 | |
582511be PA |
655 | pc = get_pc (lwp); |
656 | sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break; | |
d50171e4 | 657 | |
582511be PA |
658 | /* breakpoint_at reads from the current thread. */ |
659 | saved_thread = current_thread; | |
660 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 661 | |
3e572f71 PA |
662 | #if USE_SIGTRAP_SIGINFO |
663 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
664 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
665 | { | |
666 | if (siginfo.si_signo == SIGTRAP) | |
667 | { | |
668 | if (siginfo.si_code == GDB_ARCH_TRAP_BRKPT) | |
669 | { | |
670 | if (debug_threads) | |
671 | { | |
672 | struct thread_info *thr = get_lwp_thread (lwp); | |
673 | ||
2bf6fb9d | 674 | debug_printf ("CSBB: %s stopped by software breakpoint\n", |
3e572f71 PA |
675 | target_pid_to_str (ptid_of (thr))); |
676 | } | |
677 | ||
678 | /* Back up the PC if necessary. */ | |
679 | if (pc != sw_breakpoint_pc) | |
680 | { | |
681 | struct regcache *regcache | |
682 | = get_thread_regcache (current_thread, 1); | |
683 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
684 | } | |
685 | ||
686 | lwp->stop_pc = sw_breakpoint_pc; | |
687 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
688 | current_thread = saved_thread; | |
689 | return 1; | |
690 | } | |
691 | else if (siginfo.si_code == TRAP_HWBKPT) | |
692 | { | |
693 | if (debug_threads) | |
694 | { | |
695 | struct thread_info *thr = get_lwp_thread (lwp); | |
696 | ||
2bf6fb9d PA |
697 | debug_printf ("CSBB: %s stopped by hardware " |
698 | "breakpoint/watchpoint\n", | |
3e572f71 PA |
699 | target_pid_to_str (ptid_of (thr))); |
700 | } | |
701 | ||
702 | lwp->stop_pc = pc; | |
703 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
704 | current_thread = saved_thread; | |
705 | return 1; | |
706 | } | |
2bf6fb9d PA |
707 | else if (siginfo.si_code == TRAP_TRACE) |
708 | { | |
709 | if (debug_threads) | |
710 | { | |
711 | struct thread_info *thr = get_lwp_thread (lwp); | |
712 | ||
713 | debug_printf ("CSBB: %s stopped by trace\n", | |
714 | target_pid_to_str (ptid_of (thr))); | |
715 | } | |
716 | } | |
3e572f71 PA |
717 | } |
718 | } | |
719 | #else | |
582511be PA |
720 | /* We may have just stepped a breakpoint instruction. E.g., in |
721 | non-stop mode, GDB first tells the thread A to step a range, and | |
722 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
723 | case we need to report the breakpoint PC. */ |
724 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
582511be PA |
725 | && (*the_low_target.breakpoint_at) (sw_breakpoint_pc)) |
726 | { | |
727 | if (debug_threads) | |
728 | { | |
729 | struct thread_info *thr = get_lwp_thread (lwp); | |
730 | ||
731 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
732 | target_pid_to_str (ptid_of (thr))); | |
733 | } | |
734 | ||
735 | /* Back up the PC if necessary. */ | |
736 | if (pc != sw_breakpoint_pc) | |
737 | { | |
738 | struct regcache *regcache | |
739 | = get_thread_regcache (current_thread, 1); | |
740 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
741 | } | |
742 | ||
743 | lwp->stop_pc = sw_breakpoint_pc; | |
15c66dd6 | 744 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
582511be PA |
745 | current_thread = saved_thread; |
746 | return 1; | |
747 | } | |
748 | ||
749 | if (hardware_breakpoint_inserted_here (pc)) | |
750 | { | |
751 | if (debug_threads) | |
752 | { | |
753 | struct thread_info *thr = get_lwp_thread (lwp); | |
754 | ||
755 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
756 | target_pid_to_str (ptid_of (thr))); | |
757 | } | |
47c0c975 | 758 | |
582511be | 759 | lwp->stop_pc = pc; |
15c66dd6 | 760 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; |
582511be PA |
761 | current_thread = saved_thread; |
762 | return 1; | |
763 | } | |
3e572f71 | 764 | #endif |
582511be PA |
765 | |
766 | current_thread = saved_thread; | |
767 | return 0; | |
0d62e5e8 | 768 | } |
ce3a066d | 769 | |
b3312d80 | 770 | static struct lwp_info * |
95954743 | 771 | add_lwp (ptid_t ptid) |
611cb4a5 | 772 | { |
54a0b537 | 773 | struct lwp_info *lwp; |
0d62e5e8 | 774 | |
54a0b537 PA |
775 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
776 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 777 | |
aa5ca48f | 778 | if (the_low_target.new_thread != NULL) |
34c703da | 779 | the_low_target.new_thread (lwp); |
aa5ca48f | 780 | |
f7667f0d | 781 | lwp->thread = add_thread (ptid, lwp); |
0d62e5e8 | 782 | |
54a0b537 | 783 | return lwp; |
0d62e5e8 | 784 | } |
611cb4a5 | 785 | |
da6d8c04 DJ |
786 | /* Start an inferior process and returns its pid. |
787 | ALLARGS is a vector of program-name and args. */ | |
788 | ||
ce3a066d DJ |
789 | static int |
790 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 791 | { |
a6dbe5df | 792 | struct lwp_info *new_lwp; |
da6d8c04 | 793 | int pid; |
95954743 | 794 | ptid_t ptid; |
8cc73a39 SDJ |
795 | struct cleanup *restore_personality |
796 | = maybe_disable_address_space_randomization (disable_randomization); | |
03583c20 | 797 | |
42c81e2a | 798 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
799 | pid = vfork (); |
800 | #else | |
da6d8c04 | 801 | pid = fork (); |
52fb6437 | 802 | #endif |
da6d8c04 DJ |
803 | if (pid < 0) |
804 | perror_with_name ("fork"); | |
805 | ||
806 | if (pid == 0) | |
807 | { | |
602e3198 | 808 | close_most_fds (); |
b8e1b30e | 809 | ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da6d8c04 | 810 | |
1a981360 | 811 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 812 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 813 | #endif |
0d62e5e8 | 814 | |
a9fa9f7d DJ |
815 | setpgid (0, 0); |
816 | ||
e0f9f062 DE |
817 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
818 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
819 | Also, redirect stdin to /dev/null. */ | |
820 | if (remote_connection_is_stdio ()) | |
821 | { | |
822 | close (0); | |
823 | open ("/dev/null", O_RDONLY); | |
824 | dup2 (2, 1); | |
3e52c33d JK |
825 | if (write (2, "stdin/stdout redirected\n", |
826 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
827 | { |
828 | /* Errors ignored. */; | |
829 | } | |
e0f9f062 DE |
830 | } |
831 | ||
2b876972 DJ |
832 | execv (program, allargs); |
833 | if (errno == ENOENT) | |
834 | execvp (program, allargs); | |
da6d8c04 DJ |
835 | |
836 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 837 | strerror (errno)); |
da6d8c04 DJ |
838 | fflush (stderr); |
839 | _exit (0177); | |
840 | } | |
841 | ||
8cc73a39 | 842 | do_cleanups (restore_personality); |
03583c20 | 843 | |
95954743 PA |
844 | linux_add_process (pid, 0); |
845 | ||
846 | ptid = ptid_build (pid, pid, 0); | |
847 | new_lwp = add_lwp (ptid); | |
a6dbe5df | 848 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 849 | |
a9fa9f7d | 850 | return pid; |
da6d8c04 DJ |
851 | } |
852 | ||
8784d563 PA |
853 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
854 | error. */ | |
da6d8c04 | 855 | |
7ae1a6a6 PA |
856 | int |
857 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 858 | { |
54a0b537 | 859 | struct lwp_info *new_lwp; |
7ae1a6a6 | 860 | int lwpid = ptid_get_lwp (ptid); |
611cb4a5 | 861 | |
b8e1b30e | 862 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 863 | != 0) |
7ae1a6a6 | 864 | return errno; |
24a09b5f | 865 | |
b3312d80 | 866 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 867 | |
a6dbe5df PA |
868 | /* We need to wait for SIGSTOP before being able to make the next |
869 | ptrace call on this LWP. */ | |
870 | new_lwp->must_set_ptrace_flags = 1; | |
871 | ||
644cebc9 | 872 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
873 | { |
874 | if (debug_threads) | |
87ce2a04 | 875 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
876 | |
877 | /* The process is definitely stopped. It is in a job control | |
878 | stop, unless the kernel predates the TASK_STOPPED / | |
879 | TASK_TRACED distinction, in which case it might be in a | |
880 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
881 | can kill it, signal it, et cetera. | |
882 | ||
883 | First make sure there is a pending SIGSTOP. Since we are | |
884 | already attached, the process can not transition from stopped | |
885 | to running without a PTRACE_CONT; so we know this signal will | |
886 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
887 | probably already in the queue (unless this kernel is old | |
888 | enough to use TASK_STOPPED for ptrace stops); but since | |
889 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
890 | kill_lwp (lwpid, SIGSTOP); | |
891 | ||
892 | /* Finally, resume the stopped process. This will deliver the | |
893 | SIGSTOP (or a higher priority signal, just like normal | |
894 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 895 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
896 | } |
897 | ||
0d62e5e8 | 898 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
899 | brings it to a halt. |
900 | ||
901 | There are several cases to consider here: | |
902 | ||
903 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 904 | of a new thread that is being created. |
d50171e4 PA |
905 | In this case we should ignore that SIGSTOP and resume the |
906 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 907 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 908 | resume_continue. |
0e21c1ec DE |
909 | |
910 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
911 | to it via attach_inferior. |
912 | In this case we want the process thread to stop. | |
d50171e4 PA |
913 | This is handled by having linux_attach set last_resume_kind == |
914 | resume_stop after we return. | |
e3deef73 LM |
915 | |
916 | If the pid we are attaching to is also the tgid, we attach to and | |
917 | stop all the existing threads. Otherwise, we attach to pid and | |
918 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
919 | |
920 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
921 | existing threads. |
922 | In this case we want the thread to stop. | |
923 | FIXME: This case is currently not properly handled. | |
924 | We should wait for the SIGSTOP but don't. Things work apparently | |
925 | because enough time passes between when we ptrace (ATTACH) and when | |
926 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
927 | |
928 | On the other hand, if we are currently trying to stop all threads, we | |
929 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 930 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
931 | end of the list, and so the new thread has not yet reached |
932 | wait_for_sigstop (but will). */ | |
d50171e4 | 933 | new_lwp->stop_expected = 1; |
0d62e5e8 | 934 | |
7ae1a6a6 | 935 | return 0; |
95954743 PA |
936 | } |
937 | ||
8784d563 PA |
938 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
939 | already attached. Returns true if a new LWP is found, false | |
940 | otherwise. */ | |
941 | ||
942 | static int | |
943 | attach_proc_task_lwp_callback (ptid_t ptid) | |
944 | { | |
945 | /* Is this a new thread? */ | |
946 | if (find_thread_ptid (ptid) == NULL) | |
947 | { | |
948 | int lwpid = ptid_get_lwp (ptid); | |
949 | int err; | |
950 | ||
951 | if (debug_threads) | |
952 | debug_printf ("Found new lwp %d\n", lwpid); | |
953 | ||
954 | err = linux_attach_lwp (ptid); | |
955 | ||
956 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
957 | is returned if the thread's task still exists, and is marked | |
958 | as exited or zombie, as well as other conditions, so in that | |
959 | case, confirm the status in /proc/PID/status. */ | |
960 | if (err == ESRCH | |
961 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
962 | { | |
963 | if (debug_threads) | |
964 | { | |
965 | debug_printf ("Cannot attach to lwp %d: " | |
966 | "thread is gone (%d: %s)\n", | |
967 | lwpid, err, strerror (err)); | |
968 | } | |
969 | } | |
970 | else if (err != 0) | |
971 | { | |
972 | warning (_("Cannot attach to lwp %d: %s"), | |
973 | lwpid, | |
974 | linux_ptrace_attach_fail_reason_string (ptid, err)); | |
975 | } | |
976 | ||
977 | return 1; | |
978 | } | |
979 | return 0; | |
980 | } | |
981 | ||
e3deef73 LM |
982 | /* Attach to PID. If PID is the tgid, attach to it and all |
983 | of its threads. */ | |
984 | ||
c52daf70 | 985 | static int |
a1928bad | 986 | linux_attach (unsigned long pid) |
0d62e5e8 | 987 | { |
7ae1a6a6 PA |
988 | ptid_t ptid = ptid_build (pid, pid, 0); |
989 | int err; | |
990 | ||
e3deef73 LM |
991 | /* Attach to PID. We will check for other threads |
992 | soon. */ | |
7ae1a6a6 PA |
993 | err = linux_attach_lwp (ptid); |
994 | if (err != 0) | |
995 | error ("Cannot attach to process %ld: %s", | |
8784d563 | 996 | pid, linux_ptrace_attach_fail_reason_string (ptid, err)); |
7ae1a6a6 | 997 | |
95954743 | 998 | linux_add_process (pid, 1); |
0d62e5e8 | 999 | |
bd99dc85 PA |
1000 | if (!non_stop) |
1001 | { | |
8336d594 PA |
1002 | struct thread_info *thread; |
1003 | ||
1004 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
1005 | process. It will be collected by wait shortly. */ | |
1006 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
1007 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 1008 | } |
0d62e5e8 | 1009 | |
8784d563 PA |
1010 | /* We must attach to every LWP. If /proc is mounted, use that to |
1011 | find them now. On the one hand, the inferior may be using raw | |
1012 | clone instead of using pthreads. On the other hand, even if it | |
1013 | is using pthreads, GDB may not be connected yet (thread_db needs | |
1014 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
1015 | structures in the inferior's address space to find the list of | |
1016 | threads/LWPs, and those structures may well be corrupted. Note | |
1017 | that once thread_db is loaded, we'll still use it to list threads | |
1018 | and associate pthread info with each LWP. */ | |
1019 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
95954743 PA |
1020 | return 0; |
1021 | } | |
1022 | ||
1023 | struct counter | |
1024 | { | |
1025 | int pid; | |
1026 | int count; | |
1027 | }; | |
1028 | ||
1029 | static int | |
1030 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
1031 | { | |
1032 | struct counter *counter = args; | |
1033 | ||
1034 | if (ptid_get_pid (entry->id) == counter->pid) | |
1035 | { | |
1036 | if (++counter->count > 1) | |
1037 | return 1; | |
1038 | } | |
d61ddec4 | 1039 | |
da6d8c04 DJ |
1040 | return 0; |
1041 | } | |
1042 | ||
95954743 | 1043 | static int |
fa96cb38 | 1044 | last_thread_of_process_p (int pid) |
95954743 | 1045 | { |
95954743 | 1046 | struct counter counter = { pid , 0 }; |
da6d8c04 | 1047 | |
95954743 PA |
1048 | return (find_inferior (&all_threads, |
1049 | second_thread_of_pid_p, &counter) == NULL); | |
1050 | } | |
1051 | ||
da84f473 PA |
1052 | /* Kill LWP. */ |
1053 | ||
1054 | static void | |
1055 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1056 | { | |
d86d4aaf DE |
1057 | struct thread_info *thr = get_lwp_thread (lwp); |
1058 | int pid = lwpid_of (thr); | |
da84f473 PA |
1059 | |
1060 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1061 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1062 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1063 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1064 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1065 | per process, not one for each thread. But since we still support | |
1066 | linuxthreads, and we also support debugging programs using raw | |
1067 | clone without CLONE_THREAD, we send one for each thread. For | |
1068 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
1069 | about some old kernels where PTRACE_KILL might work better | |
1070 | (dubious if there are any such, but that's why it's paranoia), so | |
1071 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
1072 | everywhere. */ | |
1073 | ||
1074 | errno = 0; | |
69ff6be5 | 1075 | kill_lwp (pid, SIGKILL); |
da84f473 | 1076 | if (debug_threads) |
ce9e3fe7 PA |
1077 | { |
1078 | int save_errno = errno; | |
1079 | ||
1080 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
1081 | target_pid_to_str (ptid_of (thr)), | |
1082 | save_errno ? strerror (save_errno) : "OK"); | |
1083 | } | |
da84f473 PA |
1084 | |
1085 | errno = 0; | |
b8e1b30e | 1086 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1087 | if (debug_threads) |
ce9e3fe7 PA |
1088 | { |
1089 | int save_errno = errno; | |
1090 | ||
1091 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
1092 | target_pid_to_str (ptid_of (thr)), | |
1093 | save_errno ? strerror (save_errno) : "OK"); | |
1094 | } | |
da84f473 PA |
1095 | } |
1096 | ||
e76126e8 PA |
1097 | /* Kill LWP and wait for it to die. */ |
1098 | ||
1099 | static void | |
1100 | kill_wait_lwp (struct lwp_info *lwp) | |
1101 | { | |
1102 | struct thread_info *thr = get_lwp_thread (lwp); | |
1103 | int pid = ptid_get_pid (ptid_of (thr)); | |
1104 | int lwpid = ptid_get_lwp (ptid_of (thr)); | |
1105 | int wstat; | |
1106 | int res; | |
1107 | ||
1108 | if (debug_threads) | |
1109 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
1110 | ||
1111 | do | |
1112 | { | |
1113 | linux_kill_one_lwp (lwp); | |
1114 | ||
1115 | /* Make sure it died. Notes: | |
1116 | ||
1117 | - The loop is most likely unnecessary. | |
1118 | ||
1119 | - We don't use linux_wait_for_event as that could delete lwps | |
1120 | while we're iterating over them. We're not interested in | |
1121 | any pending status at this point, only in making sure all | |
1122 | wait status on the kernel side are collected until the | |
1123 | process is reaped. | |
1124 | ||
1125 | - We don't use __WALL here as the __WALL emulation relies on | |
1126 | SIGCHLD, and killing a stopped process doesn't generate | |
1127 | one, nor an exit status. | |
1128 | */ | |
1129 | res = my_waitpid (lwpid, &wstat, 0); | |
1130 | if (res == -1 && errno == ECHILD) | |
1131 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1132 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1133 | ||
586b02a9 PA |
1134 | /* Even if it was stopped, the child may have already disappeared. |
1135 | E.g., if it was killed by SIGKILL. */ | |
1136 | if (res < 0 && errno != ECHILD) | |
1137 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1138 | } |
1139 | ||
da84f473 PA |
1140 | /* Callback for `find_inferior'. Kills an lwp of a given process, |
1141 | except the leader. */ | |
95954743 PA |
1142 | |
1143 | static int | |
da84f473 | 1144 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 1145 | { |
0d62e5e8 | 1146 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 1147 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
1148 | int pid = * (int *) args; |
1149 | ||
1150 | if (ptid_get_pid (entry->id) != pid) | |
1151 | return 0; | |
0d62e5e8 | 1152 | |
fd500816 DJ |
1153 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1154 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1155 | the children get a chance to be reaped, it will remain a zombie | |
1156 | forever. */ | |
95954743 | 1157 | |
d86d4aaf | 1158 | if (lwpid_of (thread) == pid) |
95954743 PA |
1159 | { |
1160 | if (debug_threads) | |
87ce2a04 DE |
1161 | debug_printf ("lkop: is last of process %s\n", |
1162 | target_pid_to_str (entry->id)); | |
95954743 PA |
1163 | return 0; |
1164 | } | |
fd500816 | 1165 | |
e76126e8 | 1166 | kill_wait_lwp (lwp); |
95954743 | 1167 | return 0; |
da6d8c04 DJ |
1168 | } |
1169 | ||
95954743 PA |
1170 | static int |
1171 | linux_kill (int pid) | |
0d62e5e8 | 1172 | { |
95954743 | 1173 | struct process_info *process; |
54a0b537 | 1174 | struct lwp_info *lwp; |
fd500816 | 1175 | |
95954743 PA |
1176 | process = find_process_pid (pid); |
1177 | if (process == NULL) | |
1178 | return -1; | |
9d606399 | 1179 | |
f9e39928 PA |
1180 | /* If we're killing a running inferior, make sure it is stopped |
1181 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1182 | stop_all_lwps (0, NULL); |
f9e39928 | 1183 | |
da84f473 | 1184 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1185 | |
54a0b537 | 1186 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1187 | thread in the list, so do so now. */ |
95954743 | 1188 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1189 | |
784867a5 | 1190 | if (lwp == NULL) |
fd500816 | 1191 | { |
784867a5 | 1192 | if (debug_threads) |
d86d4aaf DE |
1193 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1194 | pid); | |
784867a5 JK |
1195 | } |
1196 | else | |
e76126e8 | 1197 | kill_wait_lwp (lwp); |
2d717e4f | 1198 | |
8336d594 | 1199 | the_target->mourn (process); |
f9e39928 PA |
1200 | |
1201 | /* Since we presently can only stop all lwps of all processes, we | |
1202 | need to unstop lwps of other processes. */ | |
7984d532 | 1203 | unstop_all_lwps (0, NULL); |
95954743 | 1204 | return 0; |
0d62e5e8 DJ |
1205 | } |
1206 | ||
9b224c5e PA |
1207 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1208 | signal the thread last stopped for, which we need to deliver to the | |
1209 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1210 | ||
1211 | static int | |
1212 | get_detach_signal (struct thread_info *thread) | |
1213 | { | |
a493e3e2 | 1214 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1215 | int status; |
1216 | struct lwp_info *lp = get_thread_lwp (thread); | |
1217 | ||
1218 | if (lp->status_pending_p) | |
1219 | status = lp->status_pending; | |
1220 | else | |
1221 | { | |
1222 | /* If the thread had been suspended by gdbserver, and it stopped | |
1223 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1224 | want to deliver that SIGSTOP. */ | |
1225 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1226 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1227 | return 0; |
1228 | ||
1229 | /* Otherwise, we may need to deliver the signal we | |
1230 | intercepted. */ | |
1231 | status = lp->last_status; | |
1232 | } | |
1233 | ||
1234 | if (!WIFSTOPPED (status)) | |
1235 | { | |
1236 | if (debug_threads) | |
87ce2a04 | 1237 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1238 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1239 | return 0; |
1240 | } | |
1241 | ||
1242 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1243 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1244 | { |
1245 | if (debug_threads) | |
87ce2a04 DE |
1246 | debug_printf ("GPS: lwp %s had stopped with extended " |
1247 | "status: no pending signal\n", | |
d86d4aaf | 1248 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1249 | return 0; |
1250 | } | |
1251 | ||
2ea28649 | 1252 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1253 | |
1254 | if (program_signals_p && !program_signals[signo]) | |
1255 | { | |
1256 | if (debug_threads) | |
87ce2a04 | 1257 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1258 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1259 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1260 | return 0; |
1261 | } | |
1262 | else if (!program_signals_p | |
1263 | /* If we have no way to know which signals GDB does not | |
1264 | want to have passed to the program, assume | |
1265 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1266 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1267 | { |
1268 | if (debug_threads) | |
87ce2a04 DE |
1269 | debug_printf ("GPS: lwp %s had signal %s, " |
1270 | "but we don't know if we should pass it. " | |
1271 | "Default to not.\n", | |
d86d4aaf | 1272 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1273 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1274 | return 0; |
1275 | } | |
1276 | else | |
1277 | { | |
1278 | if (debug_threads) | |
87ce2a04 | 1279 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1280 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1281 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1282 | |
1283 | return WSTOPSIG (status); | |
1284 | } | |
1285 | } | |
1286 | ||
95954743 PA |
1287 | static int |
1288 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1289 | { |
1290 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1291 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1292 | int pid = * (int *) args; |
9b224c5e | 1293 | int sig; |
95954743 PA |
1294 | |
1295 | if (ptid_get_pid (entry->id) != pid) | |
1296 | return 0; | |
6ad8ae5c | 1297 | |
9b224c5e | 1298 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1299 | if (lwp->stop_expected) |
ae13219e | 1300 | { |
9b224c5e | 1301 | if (debug_threads) |
87ce2a04 | 1302 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1303 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1304 | |
d86d4aaf | 1305 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1306 | lwp->stop_expected = 0; |
ae13219e DJ |
1307 | } |
1308 | ||
1309 | /* Flush any pending changes to the process's registers. */ | |
d86d4aaf | 1310 | regcache_invalidate_thread (thread); |
ae13219e | 1311 | |
9b224c5e PA |
1312 | /* Pass on any pending signal for this thread. */ |
1313 | sig = get_detach_signal (thread); | |
1314 | ||
ae13219e | 1315 | /* Finally, let it resume. */ |
82bfbe7e PA |
1316 | if (the_low_target.prepare_to_resume != NULL) |
1317 | the_low_target.prepare_to_resume (lwp); | |
d86d4aaf | 1318 | if (ptrace (PTRACE_DETACH, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
b8e1b30e | 1319 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
9b224c5e | 1320 | error (_("Can't detach %s: %s"), |
d86d4aaf | 1321 | target_pid_to_str (ptid_of (thread)), |
9b224c5e | 1322 | strerror (errno)); |
bd99dc85 PA |
1323 | |
1324 | delete_lwp (lwp); | |
95954743 | 1325 | return 0; |
6ad8ae5c DJ |
1326 | } |
1327 | ||
95954743 PA |
1328 | static int |
1329 | linux_detach (int pid) | |
1330 | { | |
1331 | struct process_info *process; | |
1332 | ||
1333 | process = find_process_pid (pid); | |
1334 | if (process == NULL) | |
1335 | return -1; | |
1336 | ||
f9e39928 PA |
1337 | /* Stop all threads before detaching. First, ptrace requires that |
1338 | the thread is stopped to sucessfully detach. Second, thread_db | |
1339 | may need to uninstall thread event breakpoints from memory, which | |
1340 | only works with a stopped process anyway. */ | |
7984d532 | 1341 | stop_all_lwps (0, NULL); |
f9e39928 | 1342 | |
ca5c370d | 1343 | #ifdef USE_THREAD_DB |
8336d594 | 1344 | thread_db_detach (process); |
ca5c370d PA |
1345 | #endif |
1346 | ||
fa593d66 PA |
1347 | /* Stabilize threads (move out of jump pads). */ |
1348 | stabilize_threads (); | |
1349 | ||
95954743 | 1350 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1351 | |
1352 | the_target->mourn (process); | |
f9e39928 PA |
1353 | |
1354 | /* Since we presently can only stop all lwps of all processes, we | |
1355 | need to unstop lwps of other processes. */ | |
7984d532 | 1356 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1357 | return 0; |
1358 | } | |
1359 | ||
1360 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1361 | ||
1362 | static int | |
1363 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1364 | { | |
d86d4aaf DE |
1365 | struct thread_info *thread = (struct thread_info *) entry; |
1366 | struct lwp_info *lwp = get_thread_lwp (thread); | |
f9e39928 PA |
1367 | struct process_info *process = proc; |
1368 | ||
d86d4aaf | 1369 | if (pid_of (thread) == pid_of (process)) |
f9e39928 PA |
1370 | delete_lwp (lwp); |
1371 | ||
dd6953e1 | 1372 | return 0; |
6ad8ae5c DJ |
1373 | } |
1374 | ||
8336d594 PA |
1375 | static void |
1376 | linux_mourn (struct process_info *process) | |
1377 | { | |
1378 | struct process_info_private *priv; | |
1379 | ||
1380 | #ifdef USE_THREAD_DB | |
1381 | thread_db_mourn (process); | |
1382 | #endif | |
1383 | ||
d86d4aaf | 1384 | find_inferior (&all_threads, delete_lwp_callback, process); |
f9e39928 | 1385 | |
8336d594 | 1386 | /* Freeing all private data. */ |
fe978cb0 | 1387 | priv = process->priv; |
8336d594 PA |
1388 | free (priv->arch_private); |
1389 | free (priv); | |
fe978cb0 | 1390 | process->priv = NULL; |
505106cd PA |
1391 | |
1392 | remove_process (process); | |
8336d594 PA |
1393 | } |
1394 | ||
444d6139 | 1395 | static void |
95954743 | 1396 | linux_join (int pid) |
444d6139 | 1397 | { |
444d6139 PA |
1398 | int status, ret; |
1399 | ||
1400 | do { | |
95954743 | 1401 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1402 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1403 | break; | |
1404 | } while (ret != -1 || errno != ECHILD); | |
1405 | } | |
1406 | ||
6ad8ae5c | 1407 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1408 | static int |
95954743 | 1409 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1410 | { |
95954743 PA |
1411 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1412 | ||
1413 | /* We assume we always know if a thread exits. If a whole process | |
1414 | exited but we still haven't been able to report it to GDB, we'll | |
1415 | hold on to the last lwp of the dead process. */ | |
1416 | if (lwp != NULL) | |
1417 | return !lwp->dead; | |
0d62e5e8 DJ |
1418 | else |
1419 | return 0; | |
1420 | } | |
1421 | ||
582511be PA |
1422 | /* Return 1 if this lwp still has an interesting status pending. If |
1423 | not (e.g., it had stopped for a breakpoint that is gone), return | |
1424 | false. */ | |
1425 | ||
1426 | static int | |
1427 | thread_still_has_status_pending_p (struct thread_info *thread) | |
1428 | { | |
1429 | struct lwp_info *lp = get_thread_lwp (thread); | |
1430 | ||
1431 | if (!lp->status_pending_p) | |
1432 | return 0; | |
1433 | ||
1434 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1435 | report any status pending the LWP may have. */ | |
1436 | if (thread->last_resume_kind == resume_stop | |
1437 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
1438 | return 0; | |
1439 | ||
1440 | if (thread->last_resume_kind != resume_stop | |
15c66dd6 PA |
1441 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1442 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1443 | { |
1444 | struct thread_info *saved_thread; | |
1445 | CORE_ADDR pc; | |
1446 | int discard = 0; | |
1447 | ||
1448 | gdb_assert (lp->last_status != 0); | |
1449 | ||
1450 | pc = get_pc (lp); | |
1451 | ||
1452 | saved_thread = current_thread; | |
1453 | current_thread = thread; | |
1454 | ||
1455 | if (pc != lp->stop_pc) | |
1456 | { | |
1457 | if (debug_threads) | |
1458 | debug_printf ("PC of %ld changed\n", | |
1459 | lwpid_of (thread)); | |
1460 | discard = 1; | |
1461 | } | |
3e572f71 PA |
1462 | |
1463 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1464 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
582511be PA |
1465 | && !(*the_low_target.breakpoint_at) (pc)) |
1466 | { | |
1467 | if (debug_threads) | |
1468 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1469 | lwpid_of (thread)); | |
1470 | discard = 1; | |
1471 | } | |
15c66dd6 | 1472 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1473 | && !hardware_breakpoint_inserted_here (pc)) |
1474 | { | |
1475 | if (debug_threads) | |
1476 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1477 | lwpid_of (thread)); | |
1478 | discard = 1; | |
1479 | } | |
3e572f71 | 1480 | #endif |
582511be PA |
1481 | |
1482 | current_thread = saved_thread; | |
1483 | ||
1484 | if (discard) | |
1485 | { | |
1486 | if (debug_threads) | |
1487 | debug_printf ("discarding pending breakpoint status\n"); | |
1488 | lp->status_pending_p = 0; | |
1489 | return 0; | |
1490 | } | |
1491 | } | |
1492 | ||
1493 | return 1; | |
1494 | } | |
1495 | ||
6bf5e0ba | 1496 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1497 | static int |
d50171e4 | 1498 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1499 | { |
d86d4aaf | 1500 | struct thread_info *thread = (struct thread_info *) entry; |
582511be | 1501 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1502 | ptid_t ptid = * (ptid_t *) arg; |
1503 | ||
1504 | /* Check if we're only interested in events from a specific process | |
afa8d396 PA |
1505 | or a specific LWP. */ |
1506 | if (!ptid_match (ptid_of (thread), ptid)) | |
95954743 | 1507 | return 0; |
0d62e5e8 | 1508 | |
582511be PA |
1509 | if (lp->status_pending_p |
1510 | && !thread_still_has_status_pending_p (thread)) | |
1511 | { | |
1512 | linux_resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); | |
1513 | return 0; | |
1514 | } | |
0d62e5e8 | 1515 | |
582511be | 1516 | return lp->status_pending_p; |
0d62e5e8 DJ |
1517 | } |
1518 | ||
95954743 PA |
1519 | static int |
1520 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1521 | { | |
1522 | ptid_t ptid = *(ptid_t *) data; | |
1523 | int lwp; | |
1524 | ||
1525 | if (ptid_get_lwp (ptid) != 0) | |
1526 | lwp = ptid_get_lwp (ptid); | |
1527 | else | |
1528 | lwp = ptid_get_pid (ptid); | |
1529 | ||
1530 | if (ptid_get_lwp (entry->id) == lwp) | |
1531 | return 1; | |
1532 | ||
1533 | return 0; | |
1534 | } | |
1535 | ||
1536 | struct lwp_info * | |
1537 | find_lwp_pid (ptid_t ptid) | |
1538 | { | |
d86d4aaf DE |
1539 | struct inferior_list_entry *thread |
1540 | = find_inferior (&all_threads, same_lwp, &ptid); | |
1541 | ||
1542 | if (thread == NULL) | |
1543 | return NULL; | |
1544 | ||
1545 | return get_thread_lwp ((struct thread_info *) thread); | |
95954743 PA |
1546 | } |
1547 | ||
fa96cb38 | 1548 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1549 | |
fa96cb38 PA |
1550 | static int |
1551 | num_lwps (int pid) | |
1552 | { | |
1553 | struct inferior_list_entry *inf, *tmp; | |
1554 | int count = 0; | |
0d62e5e8 | 1555 | |
fa96cb38 | 1556 | ALL_INFERIORS (&all_threads, inf, tmp) |
24a09b5f | 1557 | { |
fa96cb38 PA |
1558 | if (ptid_get_pid (inf->id) == pid) |
1559 | count++; | |
24a09b5f | 1560 | } |
3aee8918 | 1561 | |
fa96cb38 PA |
1562 | return count; |
1563 | } | |
d61ddec4 | 1564 | |
6d4ee8c6 GB |
1565 | /* The arguments passed to iterate_over_lwps. */ |
1566 | ||
1567 | struct iterate_over_lwps_args | |
1568 | { | |
1569 | /* The FILTER argument passed to iterate_over_lwps. */ | |
1570 | ptid_t filter; | |
1571 | ||
1572 | /* The CALLBACK argument passed to iterate_over_lwps. */ | |
1573 | iterate_over_lwps_ftype *callback; | |
1574 | ||
1575 | /* The DATA argument passed to iterate_over_lwps. */ | |
1576 | void *data; | |
1577 | }; | |
1578 | ||
1579 | /* Callback for find_inferior used by iterate_over_lwps to filter | |
1580 | calls to the callback supplied to that function. Returning a | |
1581 | nonzero value causes find_inferiors to stop iterating and return | |
1582 | the current inferior_list_entry. Returning zero indicates that | |
1583 | find_inferiors should continue iterating. */ | |
1584 | ||
1585 | static int | |
1586 | iterate_over_lwps_filter (struct inferior_list_entry *entry, void *args_p) | |
1587 | { | |
1588 | struct iterate_over_lwps_args *args | |
1589 | = (struct iterate_over_lwps_args *) args_p; | |
1590 | ||
1591 | if (ptid_match (entry->id, args->filter)) | |
1592 | { | |
1593 | struct thread_info *thr = (struct thread_info *) entry; | |
1594 | struct lwp_info *lwp = get_thread_lwp (thr); | |
1595 | ||
1596 | return (*args->callback) (lwp, args->data); | |
1597 | } | |
1598 | ||
1599 | return 0; | |
1600 | } | |
1601 | ||
1602 | /* See nat/linux-nat.h. */ | |
1603 | ||
1604 | struct lwp_info * | |
1605 | iterate_over_lwps (ptid_t filter, | |
1606 | iterate_over_lwps_ftype callback, | |
1607 | void *data) | |
1608 | { | |
1609 | struct iterate_over_lwps_args args = {filter, callback, data}; | |
1610 | struct inferior_list_entry *entry; | |
1611 | ||
1612 | entry = find_inferior (&all_threads, iterate_over_lwps_filter, &args); | |
1613 | if (entry == NULL) | |
1614 | return NULL; | |
1615 | ||
1616 | return get_thread_lwp ((struct thread_info *) entry); | |
1617 | } | |
1618 | ||
fa96cb38 PA |
1619 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1620 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1621 | |
fa96cb38 PA |
1622 | static void |
1623 | check_zombie_leaders (void) | |
1624 | { | |
1625 | struct process_info *proc, *tmp; | |
c3adc08c | 1626 | |
fa96cb38 | 1627 | ALL_PROCESSES (proc, tmp) |
c3adc08c | 1628 | { |
fa96cb38 PA |
1629 | pid_t leader_pid = pid_of (proc); |
1630 | struct lwp_info *leader_lp; | |
c3adc08c | 1631 | |
fa96cb38 | 1632 | leader_lp = find_lwp_pid (pid_to_ptid (leader_pid)); |
c3adc08c | 1633 | |
fa96cb38 PA |
1634 | if (debug_threads) |
1635 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1636 | "num_lwps=%d, zombie=%d\n", | |
1637 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1638 | linux_proc_pid_is_zombie (leader_pid)); | |
1639 | ||
1640 | if (leader_lp != NULL | |
1641 | /* Check if there are other threads in the group, as we may | |
1642 | have raced with the inferior simply exiting. */ | |
1643 | && !last_thread_of_process_p (leader_pid) | |
1644 | && linux_proc_pid_is_zombie (leader_pid)) | |
1645 | { | |
1646 | /* A leader zombie can mean one of two things: | |
1647 | ||
1648 | - It exited, and there's an exit status pending | |
1649 | available, or only the leader exited (not the whole | |
1650 | program). In the latter case, we can't waitpid the | |
1651 | leader's exit status until all other threads are gone. | |
1652 | ||
1653 | - There are 3 or more threads in the group, and a thread | |
1654 | other than the leader exec'd. On an exec, the Linux | |
1655 | kernel destroys all other threads (except the execing | |
1656 | one) in the thread group, and resets the execing thread's | |
1657 | tid to the tgid. No exit notification is sent for the | |
1658 | execing thread -- from the ptracer's perspective, it | |
1659 | appears as though the execing thread just vanishes. | |
1660 | Until we reap all other threads except the leader and the | |
1661 | execing thread, the leader will be zombie, and the | |
1662 | execing thread will be in `D (disc sleep)'. As soon as | |
1663 | all other threads are reaped, the execing thread changes | |
1664 | it's tid to the tgid, and the previous (zombie) leader | |
1665 | vanishes, giving place to the "new" leader. We could try | |
1666 | distinguishing the exit and exec cases, by waiting once | |
1667 | more, and seeing if something comes out, but it doesn't | |
1668 | sound useful. The previous leader _does_ go away, and | |
1669 | we'll re-add the new one once we see the exec event | |
1670 | (which is just the same as what would happen if the | |
1671 | previous leader did exit voluntarily before some other | |
1672 | thread execs). */ | |
c3adc08c | 1673 | |
fa96cb38 PA |
1674 | if (debug_threads) |
1675 | fprintf (stderr, | |
1676 | "CZL: Thread group leader %d zombie " | |
1677 | "(it exited, or another thread execd).\n", | |
1678 | leader_pid); | |
c3adc08c | 1679 | |
fa96cb38 | 1680 | delete_lwp (leader_lp); |
c3adc08c PA |
1681 | } |
1682 | } | |
fa96cb38 | 1683 | } |
c3adc08c | 1684 | |
fa96cb38 PA |
1685 | /* Callback for `find_inferior'. Returns the first LWP that is not |
1686 | stopped. ARG is a PTID filter. */ | |
d50171e4 | 1687 | |
fa96cb38 PA |
1688 | static int |
1689 | not_stopped_callback (struct inferior_list_entry *entry, void *arg) | |
1690 | { | |
1691 | struct thread_info *thr = (struct thread_info *) entry; | |
1692 | struct lwp_info *lwp; | |
1693 | ptid_t filter = *(ptid_t *) arg; | |
47c0c975 | 1694 | |
fa96cb38 PA |
1695 | if (!ptid_match (ptid_of (thr), filter)) |
1696 | return 0; | |
bd99dc85 | 1697 | |
fa96cb38 PA |
1698 | lwp = get_thread_lwp (thr); |
1699 | if (!lwp->stopped) | |
1700 | return 1; | |
1701 | ||
1702 | return 0; | |
0d62e5e8 | 1703 | } |
611cb4a5 | 1704 | |
219f2f23 PA |
1705 | /* This function should only be called if the LWP got a SIGTRAP. |
1706 | ||
1707 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1708 | event was handled, 0 otherwise. */ | |
1709 | ||
1710 | static int | |
1711 | handle_tracepoints (struct lwp_info *lwp) | |
1712 | { | |
1713 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1714 | int tpoint_related_event = 0; | |
1715 | ||
582511be PA |
1716 | gdb_assert (lwp->suspended == 0); |
1717 | ||
7984d532 PA |
1718 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1719 | uninsert tracepoints. To do this, we temporarily pause all | |
1720 | threads, unpatch away, and then unpause threads. We need to make | |
1721 | sure the unpausing doesn't resume LWP too. */ | |
1722 | lwp->suspended++; | |
1723 | ||
219f2f23 PA |
1724 | /* And we need to be sure that any all-threads-stopping doesn't try |
1725 | to move threads out of the jump pads, as it could deadlock the | |
1726 | inferior (LWP could be in the jump pad, maybe even holding the | |
1727 | lock.) */ | |
1728 | ||
1729 | /* Do any necessary step collect actions. */ | |
1730 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1731 | ||
fa593d66 PA |
1732 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1733 | ||
219f2f23 PA |
1734 | /* See if we just hit a tracepoint and do its main collect |
1735 | actions. */ | |
1736 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1737 | ||
7984d532 PA |
1738 | lwp->suspended--; |
1739 | ||
1740 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1741 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1742 | |
219f2f23 PA |
1743 | if (tpoint_related_event) |
1744 | { | |
1745 | if (debug_threads) | |
87ce2a04 | 1746 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1747 | return 1; |
1748 | } | |
1749 | ||
1750 | return 0; | |
1751 | } | |
1752 | ||
fa593d66 PA |
1753 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1754 | fast tracepoint. */ | |
1755 | ||
1756 | static int | |
1757 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1758 | struct fast_tpoint_collect_status *status) | |
1759 | { | |
1760 | CORE_ADDR thread_area; | |
d86d4aaf | 1761 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1762 | |
1763 | if (the_low_target.get_thread_area == NULL) | |
1764 | return 0; | |
1765 | ||
1766 | /* Get the thread area address. This is used to recognize which | |
1767 | thread is which when tracing with the in-process agent library. | |
1768 | We don't read anything from the address, and treat it as opaque; | |
1769 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 1770 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
fa593d66 PA |
1771 | return 0; |
1772 | ||
1773 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1774 | } | |
1775 | ||
1776 | /* The reason we resume in the caller, is because we want to be able | |
1777 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1778 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1779 | refuses to resume. */ | |
1780 | ||
1781 | static int | |
1782 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1783 | { | |
0bfdf32f | 1784 | struct thread_info *saved_thread; |
fa593d66 | 1785 | |
0bfdf32f GB |
1786 | saved_thread = current_thread; |
1787 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
1788 | |
1789 | if ((wstat == NULL | |
1790 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1791 | && supports_fast_tracepoints () | |
58b4daa5 | 1792 | && agent_loaded_p ()) |
fa593d66 PA |
1793 | { |
1794 | struct fast_tpoint_collect_status status; | |
1795 | int r; | |
1796 | ||
1797 | if (debug_threads) | |
87ce2a04 DE |
1798 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1799 | "jump pad.\n", | |
0bfdf32f | 1800 | lwpid_of (current_thread)); |
fa593d66 PA |
1801 | |
1802 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1803 | ||
1804 | if (wstat == NULL | |
1805 | || (WSTOPSIG (*wstat) != SIGILL | |
1806 | && WSTOPSIG (*wstat) != SIGFPE | |
1807 | && WSTOPSIG (*wstat) != SIGSEGV | |
1808 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1809 | { | |
1810 | lwp->collecting_fast_tracepoint = r; | |
1811 | ||
1812 | if (r != 0) | |
1813 | { | |
1814 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1815 | { | |
1816 | /* Haven't executed the original instruction yet. | |
1817 | Set breakpoint there, and wait till it's hit, | |
1818 | then single-step until exiting the jump pad. */ | |
1819 | lwp->exit_jump_pad_bkpt | |
1820 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1821 | } | |
1822 | ||
1823 | if (debug_threads) | |
87ce2a04 DE |
1824 | debug_printf ("Checking whether LWP %ld needs to move out of " |
1825 | "the jump pad...it does\n", | |
0bfdf32f GB |
1826 | lwpid_of (current_thread)); |
1827 | current_thread = saved_thread; | |
fa593d66 PA |
1828 | |
1829 | return 1; | |
1830 | } | |
1831 | } | |
1832 | else | |
1833 | { | |
1834 | /* If we get a synchronous signal while collecting, *and* | |
1835 | while executing the (relocated) original instruction, | |
1836 | reset the PC to point at the tpoint address, before | |
1837 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1838 | report the signal to GDB, and pray for the best. */ | |
1839 | ||
1840 | lwp->collecting_fast_tracepoint = 0; | |
1841 | ||
1842 | if (r != 0 | |
1843 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1844 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1845 | { | |
1846 | siginfo_t info; | |
1847 | struct regcache *regcache; | |
1848 | ||
1849 | /* The si_addr on a few signals references the address | |
1850 | of the faulting instruction. Adjust that as | |
1851 | well. */ | |
1852 | if ((WSTOPSIG (*wstat) == SIGILL | |
1853 | || WSTOPSIG (*wstat) == SIGFPE | |
1854 | || WSTOPSIG (*wstat) == SIGBUS | |
1855 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 1856 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1857 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
1858 | /* Final check just to make sure we don't clobber |
1859 | the siginfo of non-kernel-sent signals. */ | |
1860 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1861 | { | |
1862 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 1863 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1864 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
1865 | } |
1866 | ||
0bfdf32f | 1867 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
1868 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
1869 | lwp->stop_pc = status.tpoint_addr; | |
1870 | ||
1871 | /* Cancel any fast tracepoint lock this thread was | |
1872 | holding. */ | |
1873 | force_unlock_trace_buffer (); | |
1874 | } | |
1875 | ||
1876 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1877 | { | |
1878 | if (debug_threads) | |
87ce2a04 DE |
1879 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
1880 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
1881 | |
1882 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
1883 | |
1884 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1885 | lwp->exit_jump_pad_bkpt = NULL; | |
1886 | ||
1887 | unstop_all_lwps (1, lwp); | |
1888 | ||
1889 | gdb_assert (lwp->suspended >= 0); | |
1890 | } | |
1891 | } | |
1892 | } | |
1893 | ||
1894 | if (debug_threads) | |
87ce2a04 DE |
1895 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1896 | "jump pad...no\n", | |
0bfdf32f | 1897 | lwpid_of (current_thread)); |
0cccb683 | 1898 | |
0bfdf32f | 1899 | current_thread = saved_thread; |
fa593d66 PA |
1900 | return 0; |
1901 | } | |
1902 | ||
1903 | /* Enqueue one signal in the "signals to report later when out of the | |
1904 | jump pad" list. */ | |
1905 | ||
1906 | static void | |
1907 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1908 | { | |
1909 | struct pending_signals *p_sig; | |
d86d4aaf | 1910 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1911 | |
1912 | if (debug_threads) | |
87ce2a04 | 1913 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 1914 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1915 | |
1916 | if (debug_threads) | |
1917 | { | |
1918 | struct pending_signals *sig; | |
1919 | ||
1920 | for (sig = lwp->pending_signals_to_report; | |
1921 | sig != NULL; | |
1922 | sig = sig->prev) | |
87ce2a04 DE |
1923 | debug_printf (" Already queued %d\n", |
1924 | sig->signal); | |
fa593d66 | 1925 | |
87ce2a04 | 1926 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
1927 | } |
1928 | ||
1a981360 PA |
1929 | /* Don't enqueue non-RT signals if they are already in the deferred |
1930 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1931 | twice) */ | |
1932 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1933 | { | |
1934 | struct pending_signals *sig; | |
1935 | ||
1936 | for (sig = lwp->pending_signals_to_report; | |
1937 | sig != NULL; | |
1938 | sig = sig->prev) | |
1939 | { | |
1940 | if (sig->signal == WSTOPSIG (*wstat)) | |
1941 | { | |
1942 | if (debug_threads) | |
87ce2a04 DE |
1943 | debug_printf ("Not requeuing already queued non-RT signal %d" |
1944 | " for LWP %ld\n", | |
1945 | sig->signal, | |
d86d4aaf | 1946 | lwpid_of (thread)); |
1a981360 PA |
1947 | return; |
1948 | } | |
1949 | } | |
1950 | } | |
1951 | ||
fa593d66 PA |
1952 | p_sig = xmalloc (sizeof (*p_sig)); |
1953 | p_sig->prev = lwp->pending_signals_to_report; | |
1954 | p_sig->signal = WSTOPSIG (*wstat); | |
1955 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
d86d4aaf | 1956 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1957 | &p_sig->info); |
fa593d66 PA |
1958 | |
1959 | lwp->pending_signals_to_report = p_sig; | |
1960 | } | |
1961 | ||
1962 | /* Dequeue one signal from the "signals to report later when out of | |
1963 | the jump pad" list. */ | |
1964 | ||
1965 | static int | |
1966 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1967 | { | |
d86d4aaf DE |
1968 | struct thread_info *thread = get_lwp_thread (lwp); |
1969 | ||
fa593d66 PA |
1970 | if (lwp->pending_signals_to_report != NULL) |
1971 | { | |
1972 | struct pending_signals **p_sig; | |
1973 | ||
1974 | p_sig = &lwp->pending_signals_to_report; | |
1975 | while ((*p_sig)->prev != NULL) | |
1976 | p_sig = &(*p_sig)->prev; | |
1977 | ||
1978 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1979 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 1980 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1981 | &(*p_sig)->info); |
fa593d66 PA |
1982 | free (*p_sig); |
1983 | *p_sig = NULL; | |
1984 | ||
1985 | if (debug_threads) | |
87ce2a04 | 1986 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 1987 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1988 | |
1989 | if (debug_threads) | |
1990 | { | |
1991 | struct pending_signals *sig; | |
1992 | ||
1993 | for (sig = lwp->pending_signals_to_report; | |
1994 | sig != NULL; | |
1995 | sig = sig->prev) | |
87ce2a04 DE |
1996 | debug_printf (" Still queued %d\n", |
1997 | sig->signal); | |
fa593d66 | 1998 | |
87ce2a04 | 1999 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
2000 | } |
2001 | ||
2002 | return 1; | |
2003 | } | |
2004 | ||
2005 | return 0; | |
2006 | } | |
2007 | ||
582511be PA |
2008 | /* Fetch the possibly triggered data watchpoint info and store it in |
2009 | CHILD. | |
d50171e4 | 2010 | |
582511be PA |
2011 | On some archs, like x86, that use debug registers to set |
2012 | watchpoints, it's possible that the way to know which watched | |
2013 | address trapped, is to check the register that is used to select | |
2014 | which address to watch. Problem is, between setting the watchpoint | |
2015 | and reading back which data address trapped, the user may change | |
2016 | the set of watchpoints, and, as a consequence, GDB changes the | |
2017 | debug registers in the inferior. To avoid reading back a stale | |
2018 | stopped-data-address when that happens, we cache in LP the fact | |
2019 | that a watchpoint trapped, and the corresponding data address, as | |
2020 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
2021 | registers meanwhile, we have the cached data we can rely on. */ | |
d50171e4 | 2022 | |
582511be PA |
2023 | static int |
2024 | check_stopped_by_watchpoint (struct lwp_info *child) | |
2025 | { | |
2026 | if (the_low_target.stopped_by_watchpoint != NULL) | |
d50171e4 | 2027 | { |
582511be | 2028 | struct thread_info *saved_thread; |
d50171e4 | 2029 | |
582511be PA |
2030 | saved_thread = current_thread; |
2031 | current_thread = get_lwp_thread (child); | |
2032 | ||
2033 | if (the_low_target.stopped_by_watchpoint ()) | |
d50171e4 | 2034 | { |
15c66dd6 | 2035 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; |
582511be PA |
2036 | |
2037 | if (the_low_target.stopped_data_address != NULL) | |
2038 | child->stopped_data_address | |
2039 | = the_low_target.stopped_data_address (); | |
2040 | else | |
2041 | child->stopped_data_address = 0; | |
d50171e4 PA |
2042 | } |
2043 | ||
0bfdf32f | 2044 | current_thread = saved_thread; |
d50171e4 PA |
2045 | } |
2046 | ||
15c66dd6 | 2047 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
c4d9ceb6 YQ |
2048 | } |
2049 | ||
de0d863e DB |
2050 | /* Return the ptrace options that we want to try to enable. */ |
2051 | ||
2052 | static int | |
2053 | linux_low_ptrace_options (int attached) | |
2054 | { | |
2055 | int options = 0; | |
2056 | ||
2057 | if (!attached) | |
2058 | options |= PTRACE_O_EXITKILL; | |
2059 | ||
2060 | if (report_fork_events) | |
2061 | options |= PTRACE_O_TRACEFORK; | |
2062 | ||
c269dbdb DB |
2063 | if (report_vfork_events) |
2064 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); | |
2065 | ||
de0d863e DB |
2066 | return options; |
2067 | } | |
2068 | ||
fa96cb38 PA |
2069 | /* Do low-level handling of the event, and check if we should go on |
2070 | and pass it to caller code. Return the affected lwp if we are, or | |
2071 | NULL otherwise. */ | |
2072 | ||
2073 | static struct lwp_info * | |
582511be | 2074 | linux_low_filter_event (int lwpid, int wstat) |
fa96cb38 PA |
2075 | { |
2076 | struct lwp_info *child; | |
2077 | struct thread_info *thread; | |
582511be | 2078 | int have_stop_pc = 0; |
fa96cb38 PA |
2079 | |
2080 | child = find_lwp_pid (pid_to_ptid (lwpid)); | |
2081 | ||
2082 | /* If we didn't find a process, one of two things presumably happened: | |
2083 | - A process we started and then detached from has exited. Ignore it. | |
2084 | - A process we are controlling has forked and the new child's stop | |
2085 | was reported to us by the kernel. Save its PID. */ | |
2086 | if (child == NULL && WIFSTOPPED (wstat)) | |
2087 | { | |
2088 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2089 | return NULL; | |
2090 | } | |
2091 | else if (child == NULL) | |
2092 | return NULL; | |
2093 | ||
2094 | thread = get_lwp_thread (child); | |
2095 | ||
2096 | child->stopped = 1; | |
2097 | ||
2098 | child->last_status = wstat; | |
2099 | ||
582511be PA |
2100 | /* Check if the thread has exited. */ |
2101 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2102 | { | |
2103 | if (debug_threads) | |
2104 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
2105 | if (num_lwps (pid_of (thread)) > 1) | |
2106 | { | |
2107 | ||
2108 | /* If there is at least one more LWP, then the exit signal was | |
2109 | not the end of the debugged application and should be | |
2110 | ignored. */ | |
2111 | delete_lwp (child); | |
2112 | return NULL; | |
2113 | } | |
2114 | else | |
2115 | { | |
2116 | /* This was the last lwp in the process. Since events are | |
2117 | serialized to GDB core, and we can't report this one | |
2118 | right now, but GDB core and the other target layers will | |
2119 | want to be notified about the exit code/signal, leave the | |
2120 | status pending for the next time we're able to report | |
2121 | it. */ | |
2122 | mark_lwp_dead (child, wstat); | |
2123 | return child; | |
2124 | } | |
2125 | } | |
2126 | ||
2127 | gdb_assert (WIFSTOPPED (wstat)); | |
2128 | ||
fa96cb38 PA |
2129 | if (WIFSTOPPED (wstat)) |
2130 | { | |
2131 | struct process_info *proc; | |
2132 | ||
2133 | /* Architecture-specific setup after inferior is running. This | |
2134 | needs to happen after we have attached to the inferior and it | |
2135 | is stopped for the first time, but before we access any | |
2136 | inferior registers. */ | |
2137 | proc = find_process_pid (pid_of (thread)); | |
fe978cb0 | 2138 | if (proc->priv->new_inferior) |
fa96cb38 | 2139 | { |
0bfdf32f | 2140 | struct thread_info *saved_thread; |
fa96cb38 | 2141 | |
0bfdf32f GB |
2142 | saved_thread = current_thread; |
2143 | current_thread = thread; | |
fa96cb38 PA |
2144 | |
2145 | the_low_target.arch_setup (); | |
2146 | ||
0bfdf32f | 2147 | current_thread = saved_thread; |
fa96cb38 | 2148 | |
fe978cb0 | 2149 | proc->priv->new_inferior = 0; |
fa96cb38 PA |
2150 | } |
2151 | } | |
2152 | ||
fa96cb38 PA |
2153 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2154 | { | |
beed38b8 | 2155 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2156 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2157 | |
de0d863e | 2158 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2159 | child->must_set_ptrace_flags = 0; |
2160 | } | |
2161 | ||
582511be PA |
2162 | /* Be careful to not overwrite stop_pc until |
2163 | check_stopped_by_breakpoint is called. */ | |
fa96cb38 | 2164 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2165 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2166 | { |
582511be | 2167 | child->stop_pc = get_pc (child); |
de0d863e DB |
2168 | if (handle_extended_wait (child, wstat)) |
2169 | { | |
2170 | /* The event has been handled, so just return without | |
2171 | reporting it. */ | |
2172 | return NULL; | |
2173 | } | |
fa96cb38 PA |
2174 | } |
2175 | ||
3e572f71 PA |
2176 | /* Check first whether this was a SW/HW breakpoint before checking |
2177 | watchpoints, because at least s390 can't tell the data address of | |
2178 | hardware watchpoint hits, and returns stopped-by-watchpoint as | |
2179 | long as there's a watchpoint set. */ | |
2180 | if (WIFSTOPPED (wstat) && linux_wstatus_maybe_breakpoint (wstat)) | |
582511be PA |
2181 | { |
2182 | if (check_stopped_by_breakpoint (child)) | |
2183 | have_stop_pc = 1; | |
2184 | } | |
2185 | ||
3e572f71 PA |
2186 | /* Note that TRAP_HWBKPT can indicate either a hardware breakpoint |
2187 | or hardware watchpoint. Check which is which if we got | |
2188 | TARGET_STOPPED_BY_HW_BREAKPOINT. */ | |
2189 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP | |
2190 | && (child->stop_reason == TARGET_STOPPED_BY_NO_REASON | |
2191 | || child->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
2192 | check_stopped_by_watchpoint (child); | |
2193 | ||
582511be PA |
2194 | if (!have_stop_pc) |
2195 | child->stop_pc = get_pc (child); | |
2196 | ||
fa96cb38 PA |
2197 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2198 | && child->stop_expected) | |
2199 | { | |
2200 | if (debug_threads) | |
2201 | debug_printf ("Expected stop.\n"); | |
2202 | child->stop_expected = 0; | |
2203 | ||
2204 | if (thread->last_resume_kind == resume_stop) | |
2205 | { | |
2206 | /* We want to report the stop to the core. Treat the | |
2207 | SIGSTOP as a normal event. */ | |
2bf6fb9d PA |
2208 | if (debug_threads) |
2209 | debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n", | |
2210 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2211 | } |
2212 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2213 | { | |
2214 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2215 | pending. */ |
2bf6fb9d PA |
2216 | if (debug_threads) |
2217 | debug_printf ("LLW: SIGSTOP caught for %s " | |
2218 | "while stopping threads.\n", | |
2219 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2220 | return NULL; |
2221 | } | |
2222 | else | |
2223 | { | |
2bf6fb9d PA |
2224 | /* This is a delayed SIGSTOP. Filter out the event. */ |
2225 | if (debug_threads) | |
2226 | debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", | |
2227 | child->stepping ? "step" : "continue", | |
2228 | target_pid_to_str (ptid_of (thread))); | |
2229 | ||
fa96cb38 PA |
2230 | linux_resume_one_lwp (child, child->stepping, 0, NULL); |
2231 | return NULL; | |
2232 | } | |
2233 | } | |
2234 | ||
582511be PA |
2235 | child->status_pending_p = 1; |
2236 | child->status_pending = wstat; | |
fa96cb38 PA |
2237 | return child; |
2238 | } | |
2239 | ||
20ba1ce6 PA |
2240 | /* Resume LWPs that are currently stopped without any pending status |
2241 | to report, but are resumed from the core's perspective. */ | |
2242 | ||
2243 | static void | |
2244 | resume_stopped_resumed_lwps (struct inferior_list_entry *entry) | |
2245 | { | |
2246 | struct thread_info *thread = (struct thread_info *) entry; | |
2247 | struct lwp_info *lp = get_thread_lwp (thread); | |
2248 | ||
2249 | if (lp->stopped | |
2250 | && !lp->status_pending_p | |
2251 | && thread->last_resume_kind != resume_stop | |
2252 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
2253 | { | |
2254 | int step = thread->last_resume_kind == resume_step; | |
2255 | ||
2256 | if (debug_threads) | |
2257 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2258 | target_pid_to_str (ptid_of (thread)), | |
2259 | paddress (lp->stop_pc), | |
2260 | step); | |
2261 | ||
2262 | linux_resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); | |
2263 | } | |
2264 | } | |
2265 | ||
fa96cb38 PA |
2266 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
2267 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
2268 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2269 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2270 | the stop status through the status pointer WSTAT. OPTIONS is | |
2271 | passed to the waitpid call. Return 0 if no event was found and | |
2272 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2273 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 2274 | |
0d62e5e8 | 2275 | static int |
fa96cb38 PA |
2276 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
2277 | int *wstatp, int options) | |
0d62e5e8 | 2278 | { |
d86d4aaf | 2279 | struct thread_info *event_thread; |
d50171e4 | 2280 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2281 | sigset_t block_mask, prev_mask; |
d50171e4 | 2282 | |
fa96cb38 | 2283 | retry: |
d86d4aaf DE |
2284 | /* N.B. event_thread points to the thread_info struct that contains |
2285 | event_child. Keep them in sync. */ | |
2286 | event_thread = NULL; | |
d50171e4 PA |
2287 | event_child = NULL; |
2288 | requested_child = NULL; | |
0d62e5e8 | 2289 | |
95954743 | 2290 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2291 | |
fa96cb38 | 2292 | if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid)) |
0d62e5e8 | 2293 | { |
d86d4aaf | 2294 | event_thread = (struct thread_info *) |
fa96cb38 | 2295 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); |
d86d4aaf DE |
2296 | if (event_thread != NULL) |
2297 | event_child = get_thread_lwp (event_thread); | |
2298 | if (debug_threads && event_thread) | |
2299 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2300 | } |
fa96cb38 | 2301 | else if (!ptid_equal (filter_ptid, null_ptid)) |
0d62e5e8 | 2302 | { |
fa96cb38 | 2303 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2304 | |
bde24c0a | 2305 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
2306 | && requested_child->status_pending_p |
2307 | && requested_child->collecting_fast_tracepoint) | |
2308 | { | |
2309 | enqueue_one_deferred_signal (requested_child, | |
2310 | &requested_child->status_pending); | |
2311 | requested_child->status_pending_p = 0; | |
2312 | requested_child->status_pending = 0; | |
2313 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2314 | } | |
2315 | ||
2316 | if (requested_child->suspended | |
2317 | && requested_child->status_pending_p) | |
38e08fca GB |
2318 | { |
2319 | internal_error (__FILE__, __LINE__, | |
2320 | "requesting an event out of a" | |
2321 | " suspended child?"); | |
2322 | } | |
fa593d66 | 2323 | |
d50171e4 | 2324 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2325 | { |
2326 | event_child = requested_child; | |
2327 | event_thread = get_lwp_thread (event_child); | |
2328 | } | |
0d62e5e8 | 2329 | } |
611cb4a5 | 2330 | |
0d62e5e8 DJ |
2331 | if (event_child != NULL) |
2332 | { | |
bd99dc85 | 2333 | if (debug_threads) |
87ce2a04 | 2334 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2335 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2336 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2337 | event_child->status_pending_p = 0; |
2338 | event_child->status_pending = 0; | |
0bfdf32f | 2339 | current_thread = event_thread; |
d86d4aaf | 2340 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2341 | } |
2342 | ||
fa96cb38 PA |
2343 | /* But if we don't find a pending event, we'll have to wait. |
2344 | ||
2345 | We only enter this loop if no process has a pending wait status. | |
2346 | Thus any action taken in response to a wait status inside this | |
2347 | loop is responding as soon as we detect the status, not after any | |
2348 | pending events. */ | |
d8301ad1 | 2349 | |
fa96cb38 PA |
2350 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2351 | all signals while here. */ | |
2352 | sigfillset (&block_mask); | |
2353 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2354 | ||
582511be PA |
2355 | /* Always pull all events out of the kernel. We'll randomly select |
2356 | an event LWP out of all that have events, to prevent | |
2357 | starvation. */ | |
fa96cb38 | 2358 | while (event_child == NULL) |
0d62e5e8 | 2359 | { |
fa96cb38 | 2360 | pid_t ret = 0; |
0d62e5e8 | 2361 | |
fa96cb38 PA |
2362 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2363 | quirks: | |
0d62e5e8 | 2364 | |
fa96cb38 PA |
2365 | - If the thread group leader exits while other threads in the |
2366 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2367 | waitpid won't return an exit status until the other threads | |
2368 | in the group are reaped. | |
611cb4a5 | 2369 | |
fa96cb38 PA |
2370 | - When a non-leader thread execs, that thread just vanishes |
2371 | without reporting an exit (so we'd hang if we waited for it | |
2372 | explicitly in that case). The exec event is reported to | |
2373 | the TGID pid (although we don't currently enable exec | |
2374 | events). */ | |
2375 | errno = 0; | |
2376 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2377 | |
fa96cb38 PA |
2378 | if (debug_threads) |
2379 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2380 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2381 | |
fa96cb38 | 2382 | if (ret > 0) |
0d62e5e8 | 2383 | { |
89be2091 | 2384 | if (debug_threads) |
bd99dc85 | 2385 | { |
fa96cb38 PA |
2386 | debug_printf ("LLW: waitpid %ld received %s\n", |
2387 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2388 | } |
89be2091 | 2389 | |
582511be PA |
2390 | /* Filter all events. IOW, leave all events pending. We'll |
2391 | randomly select an event LWP out of all that have events | |
2392 | below. */ | |
2393 | linux_low_filter_event (ret, *wstatp); | |
fa96cb38 PA |
2394 | /* Retry until nothing comes out of waitpid. A single |
2395 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2396 | continue; |
2397 | } | |
2398 | ||
20ba1ce6 PA |
2399 | /* Now that we've pulled all events out of the kernel, resume |
2400 | LWPs that don't have an interesting event to report. */ | |
2401 | if (stopping_threads == NOT_STOPPING_THREADS) | |
2402 | for_each_inferior (&all_threads, resume_stopped_resumed_lwps); | |
2403 | ||
2404 | /* ... and find an LWP with a status to report to the core, if | |
2405 | any. */ | |
582511be PA |
2406 | event_thread = (struct thread_info *) |
2407 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); | |
2408 | if (event_thread != NULL) | |
2409 | { | |
2410 | event_child = get_thread_lwp (event_thread); | |
2411 | *wstatp = event_child->status_pending; | |
2412 | event_child->status_pending_p = 0; | |
2413 | event_child->status_pending = 0; | |
2414 | break; | |
2415 | } | |
2416 | ||
fa96cb38 PA |
2417 | /* Check for zombie thread group leaders. Those can't be reaped |
2418 | until all other threads in the thread group are. */ | |
2419 | check_zombie_leaders (); | |
2420 | ||
2421 | /* If there are no resumed children left in the set of LWPs we | |
2422 | want to wait for, bail. We can't just block in | |
2423 | waitpid/sigsuspend, because lwps might have been left stopped | |
2424 | in trace-stop state, and we'd be stuck forever waiting for | |
2425 | their status to change (which would only happen if we resumed | |
2426 | them). Even if WNOHANG is set, this return code is preferred | |
2427 | over 0 (below), as it is more detailed. */ | |
2428 | if ((find_inferior (&all_threads, | |
2429 | not_stopped_callback, | |
2430 | &wait_ptid) == NULL)) | |
a6dbe5df | 2431 | { |
fa96cb38 PA |
2432 | if (debug_threads) |
2433 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2434 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2435 | return -1; | |
a6dbe5df PA |
2436 | } |
2437 | ||
fa96cb38 PA |
2438 | /* No interesting event to report to the caller. */ |
2439 | if ((options & WNOHANG)) | |
24a09b5f | 2440 | { |
fa96cb38 PA |
2441 | if (debug_threads) |
2442 | debug_printf ("WNOHANG set, no event found\n"); | |
2443 | ||
2444 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2445 | return 0; | |
24a09b5f DJ |
2446 | } |
2447 | ||
fa96cb38 PA |
2448 | /* Block until we get an event reported with SIGCHLD. */ |
2449 | if (debug_threads) | |
2450 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2451 | |
fa96cb38 PA |
2452 | sigsuspend (&prev_mask); |
2453 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2454 | goto retry; | |
2455 | } | |
d50171e4 | 2456 | |
fa96cb38 | 2457 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2458 | |
0bfdf32f | 2459 | current_thread = event_thread; |
d50171e4 | 2460 | |
fa96cb38 PA |
2461 | /* Check for thread exit. */ |
2462 | if (! WIFSTOPPED (*wstatp)) | |
2463 | { | |
2464 | gdb_assert (last_thread_of_process_p (pid_of (event_thread))); | |
2465 | ||
2466 | if (debug_threads) | |
2467 | debug_printf ("LWP %d is the last lwp of process. " | |
2468 | "Process %ld exiting.\n", | |
2469 | pid_of (event_thread), lwpid_of (event_thread)); | |
d86d4aaf | 2470 | return lwpid_of (event_thread); |
611cb4a5 | 2471 | } |
0d62e5e8 | 2472 | |
fa96cb38 PA |
2473 | return lwpid_of (event_thread); |
2474 | } | |
2475 | ||
2476 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2477 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2478 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2479 | the stop status through the status pointer WSTAT. OPTIONS is | |
2480 | passed to the waitpid call. Return 0 if no event was found and | |
2481 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2482 | was found. Return the PID of the stopped child otherwise. */ | |
2483 | ||
2484 | static int | |
2485 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2486 | { | |
2487 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2488 | } |
2489 | ||
6bf5e0ba PA |
2490 | /* Count the LWP's that have had events. */ |
2491 | ||
2492 | static int | |
2493 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2494 | { | |
d86d4aaf | 2495 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2496 | struct lwp_info *lp = get_thread_lwp (thread); |
6bf5e0ba PA |
2497 | int *count = data; |
2498 | ||
2499 | gdb_assert (count != NULL); | |
2500 | ||
582511be | 2501 | /* Count only resumed LWPs that have an event pending. */ |
8336d594 | 2502 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2503 | && lp->status_pending_p) |
6bf5e0ba PA |
2504 | (*count)++; |
2505 | ||
2506 | return 0; | |
2507 | } | |
2508 | ||
2509 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2510 | ||
2511 | static int | |
2512 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2513 | { | |
d86d4aaf DE |
2514 | struct thread_info *thread = (struct thread_info *) entry; |
2515 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba | 2516 | |
8336d594 PA |
2517 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2518 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2519 | && lp->status_pending_p) |
2520 | return 1; | |
2521 | else | |
2522 | return 0; | |
2523 | } | |
2524 | ||
b90fc188 | 2525 | /* Select the Nth LWP that has had an event. */ |
6bf5e0ba PA |
2526 | |
2527 | static int | |
2528 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2529 | { | |
d86d4aaf | 2530 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2531 | struct lwp_info *lp = get_thread_lwp (thread); |
6bf5e0ba PA |
2532 | int *selector = data; |
2533 | ||
2534 | gdb_assert (selector != NULL); | |
2535 | ||
582511be | 2536 | /* Select only resumed LWPs that have an event pending. */ |
91baf43f | 2537 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2538 | && lp->status_pending_p) |
6bf5e0ba PA |
2539 | if ((*selector)-- == 0) |
2540 | return 1; | |
2541 | ||
2542 | return 0; | |
2543 | } | |
2544 | ||
6bf5e0ba PA |
2545 | /* Select one LWP out of those that have events pending. */ |
2546 | ||
2547 | static void | |
2548 | select_event_lwp (struct lwp_info **orig_lp) | |
2549 | { | |
2550 | int num_events = 0; | |
2551 | int random_selector; | |
582511be PA |
2552 | struct thread_info *event_thread = NULL; |
2553 | ||
2554 | /* In all-stop, give preference to the LWP that is being | |
2555 | single-stepped. There will be at most one, and it's the LWP that | |
2556 | the core is most interested in. If we didn't do this, then we'd | |
2557 | have to handle pending step SIGTRAPs somehow in case the core | |
2558 | later continues the previously-stepped thread, otherwise we'd | |
2559 | report the pending SIGTRAP, and the core, not having stepped the | |
2560 | thread, wouldn't understand what the trap was for, and therefore | |
2561 | would report it to the user as a random signal. */ | |
2562 | if (!non_stop) | |
6bf5e0ba | 2563 | { |
582511be PA |
2564 | event_thread |
2565 | = (struct thread_info *) find_inferior (&all_threads, | |
2566 | select_singlestep_lwp_callback, | |
2567 | NULL); | |
2568 | if (event_thread != NULL) | |
2569 | { | |
2570 | if (debug_threads) | |
2571 | debug_printf ("SEL: Select single-step %s\n", | |
2572 | target_pid_to_str (ptid_of (event_thread))); | |
2573 | } | |
6bf5e0ba | 2574 | } |
582511be | 2575 | if (event_thread == NULL) |
6bf5e0ba PA |
2576 | { |
2577 | /* No single-stepping LWP. Select one at random, out of those | |
b90fc188 | 2578 | which have had events. */ |
6bf5e0ba | 2579 | |
b90fc188 | 2580 | /* First see how many events we have. */ |
d86d4aaf | 2581 | find_inferior (&all_threads, count_events_callback, &num_events); |
8bf3b159 | 2582 | gdb_assert (num_events > 0); |
6bf5e0ba | 2583 | |
b90fc188 PA |
2584 | /* Now randomly pick a LWP out of those that have had |
2585 | events. */ | |
6bf5e0ba PA |
2586 | random_selector = (int) |
2587 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2588 | ||
2589 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2590 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2591 | num_events, random_selector); | |
6bf5e0ba | 2592 | |
d86d4aaf DE |
2593 | event_thread |
2594 | = (struct thread_info *) find_inferior (&all_threads, | |
2595 | select_event_lwp_callback, | |
2596 | &random_selector); | |
6bf5e0ba PA |
2597 | } |
2598 | ||
d86d4aaf | 2599 | if (event_thread != NULL) |
6bf5e0ba | 2600 | { |
d86d4aaf DE |
2601 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2602 | ||
6bf5e0ba PA |
2603 | /* Switch the event LWP. */ |
2604 | *orig_lp = event_lp; | |
2605 | } | |
2606 | } | |
2607 | ||
7984d532 PA |
2608 | /* Decrement the suspend count of an LWP. */ |
2609 | ||
2610 | static int | |
2611 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2612 | { | |
d86d4aaf DE |
2613 | struct thread_info *thread = (struct thread_info *) entry; |
2614 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
2615 | |
2616 | /* Ignore EXCEPT. */ | |
2617 | if (lwp == except) | |
2618 | return 0; | |
2619 | ||
2620 | lwp->suspended--; | |
2621 | ||
2622 | gdb_assert (lwp->suspended >= 0); | |
2623 | return 0; | |
2624 | } | |
2625 | ||
2626 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2627 | NULL. */ | |
2628 | ||
2629 | static void | |
2630 | unsuspend_all_lwps (struct lwp_info *except) | |
2631 | { | |
d86d4aaf | 2632 | find_inferior (&all_threads, unsuspend_one_lwp, except); |
7984d532 PA |
2633 | } |
2634 | ||
fa593d66 PA |
2635 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2636 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2637 | void *data); | |
2638 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2639 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2640 | struct target_waitstatus *ourstatus, | |
2641 | int target_options); | |
2642 | ||
2643 | /* Stabilize threads (move out of jump pads). | |
2644 | ||
2645 | If a thread is midway collecting a fast tracepoint, we need to | |
2646 | finish the collection and move it out of the jump pad before | |
2647 | reporting the signal. | |
2648 | ||
2649 | This avoids recursion while collecting (when a signal arrives | |
2650 | midway, and the signal handler itself collects), which would trash | |
2651 | the trace buffer. In case the user set a breakpoint in a signal | |
2652 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2653 | Most importantly, there are certain things we can't do safely if | |
2654 | threads are stopped in a jump pad (or in its callee's). For | |
2655 | example: | |
2656 | ||
2657 | - starting a new trace run. A thread still collecting the | |
2658 | previous run, could trash the trace buffer when resumed. The trace | |
2659 | buffer control structures would have been reset but the thread had | |
2660 | no way to tell. The thread could even midway memcpy'ing to the | |
2661 | buffer, which would mean that when resumed, it would clobber the | |
2662 | trace buffer that had been set for a new run. | |
2663 | ||
2664 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2665 | safely. Say you do tstart while a thread is stopped midway while | |
2666 | collecting. When the thread is later resumed, it finishes the | |
2667 | collection, and returns to the jump pad, to execute the original | |
2668 | instruction that was under the tracepoint jump at the time the | |
2669 | older run had been started. If the jump pad had been rewritten | |
2670 | since for something else in the new run, the thread would now | |
2671 | execute the wrong / random instructions. */ | |
2672 | ||
2673 | static void | |
2674 | linux_stabilize_threads (void) | |
2675 | { | |
0bfdf32f | 2676 | struct thread_info *saved_thread; |
d86d4aaf | 2677 | struct thread_info *thread_stuck; |
fa593d66 | 2678 | |
d86d4aaf DE |
2679 | thread_stuck |
2680 | = (struct thread_info *) find_inferior (&all_threads, | |
2681 | stuck_in_jump_pad_callback, | |
2682 | NULL); | |
2683 | if (thread_stuck != NULL) | |
fa593d66 | 2684 | { |
b4d51a55 | 2685 | if (debug_threads) |
87ce2a04 | 2686 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2687 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2688 | return; |
2689 | } | |
2690 | ||
0bfdf32f | 2691 | saved_thread = current_thread; |
fa593d66 PA |
2692 | |
2693 | stabilizing_threads = 1; | |
2694 | ||
2695 | /* Kick 'em all. */ | |
d86d4aaf | 2696 | for_each_inferior (&all_threads, move_out_of_jump_pad_callback); |
fa593d66 PA |
2697 | |
2698 | /* Loop until all are stopped out of the jump pads. */ | |
d86d4aaf | 2699 | while (find_inferior (&all_threads, lwp_running, NULL) != NULL) |
fa593d66 PA |
2700 | { |
2701 | struct target_waitstatus ourstatus; | |
2702 | struct lwp_info *lwp; | |
fa593d66 PA |
2703 | int wstat; |
2704 | ||
2705 | /* Note that we go through the full wait even loop. While | |
2706 | moving threads out of jump pad, we need to be able to step | |
2707 | over internal breakpoints and such. */ | |
32fcada3 | 2708 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2709 | |
2710 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2711 | { | |
0bfdf32f | 2712 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2713 | |
2714 | /* Lock it. */ | |
2715 | lwp->suspended++; | |
2716 | ||
a493e3e2 | 2717 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2718 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2719 | { |
2ea28649 | 2720 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2721 | enqueue_one_deferred_signal (lwp, &wstat); |
2722 | } | |
2723 | } | |
2724 | } | |
2725 | ||
d86d4aaf | 2726 | find_inferior (&all_threads, unsuspend_one_lwp, NULL); |
fa593d66 PA |
2727 | |
2728 | stabilizing_threads = 0; | |
2729 | ||
0bfdf32f | 2730 | current_thread = saved_thread; |
fa593d66 | 2731 | |
b4d51a55 | 2732 | if (debug_threads) |
fa593d66 | 2733 | { |
d86d4aaf DE |
2734 | thread_stuck |
2735 | = (struct thread_info *) find_inferior (&all_threads, | |
2736 | stuck_in_jump_pad_callback, | |
2737 | NULL); | |
2738 | if (thread_stuck != NULL) | |
87ce2a04 | 2739 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2740 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2741 | } |
2742 | } | |
2743 | ||
582511be PA |
2744 | static void async_file_mark (void); |
2745 | ||
2746 | /* Convenience function that is called when the kernel reports an | |
2747 | event that is not passed out to GDB. */ | |
2748 | ||
2749 | static ptid_t | |
2750 | ignore_event (struct target_waitstatus *ourstatus) | |
2751 | { | |
2752 | /* If we got an event, there may still be others, as a single | |
2753 | SIGCHLD can indicate more than one child stopped. This forces | |
2754 | another target_wait call. */ | |
2755 | async_file_mark (); | |
2756 | ||
2757 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2758 | return null_ptid; | |
2759 | } | |
2760 | ||
de0d863e DB |
2761 | /* Return non-zero if WAITSTATUS reflects an extended linux |
2762 | event. Otherwise, return zero. */ | |
2763 | ||
2764 | static int | |
2765 | extended_event_reported (const struct target_waitstatus *waitstatus) | |
2766 | { | |
2767 | if (waitstatus == NULL) | |
2768 | return 0; | |
2769 | ||
c269dbdb DB |
2770 | return (waitstatus->kind == TARGET_WAITKIND_FORKED |
2771 | || waitstatus->kind == TARGET_WAITKIND_VFORKED | |
2772 | || waitstatus->kind == TARGET_WAITKIND_VFORK_DONE); | |
de0d863e DB |
2773 | } |
2774 | ||
0d62e5e8 | 2775 | /* Wait for process, returns status. */ |
da6d8c04 | 2776 | |
95954743 PA |
2777 | static ptid_t |
2778 | linux_wait_1 (ptid_t ptid, | |
2779 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2780 | { |
e5f1222d | 2781 | int w; |
fc7238bb | 2782 | struct lwp_info *event_child; |
bd99dc85 | 2783 | int options; |
bd99dc85 | 2784 | int pid; |
6bf5e0ba PA |
2785 | int step_over_finished; |
2786 | int bp_explains_trap; | |
2787 | int maybe_internal_trap; | |
2788 | int report_to_gdb; | |
219f2f23 | 2789 | int trace_event; |
c2d6af84 | 2790 | int in_step_range; |
bd99dc85 | 2791 | |
87ce2a04 DE |
2792 | if (debug_threads) |
2793 | { | |
2794 | debug_enter (); | |
2795 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
2796 | } | |
2797 | ||
bd99dc85 PA |
2798 | /* Translate generic target options into linux options. */ |
2799 | options = __WALL; | |
2800 | if (target_options & TARGET_WNOHANG) | |
2801 | options |= WNOHANG; | |
0d62e5e8 | 2802 | |
fa593d66 PA |
2803 | bp_explains_trap = 0; |
2804 | trace_event = 0; | |
c2d6af84 | 2805 | in_step_range = 0; |
bd99dc85 PA |
2806 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2807 | ||
6bf5e0ba PA |
2808 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2809 | pid = linux_wait_for_event (ptid, &w, options); | |
2810 | else | |
2811 | { | |
2812 | if (debug_threads) | |
87ce2a04 DE |
2813 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
2814 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
2815 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
2816 | } | |
2817 | ||
fa96cb38 | 2818 | if (pid == 0) |
87ce2a04 | 2819 | { |
fa96cb38 PA |
2820 | gdb_assert (target_options & TARGET_WNOHANG); |
2821 | ||
87ce2a04 DE |
2822 | if (debug_threads) |
2823 | { | |
fa96cb38 PA |
2824 | debug_printf ("linux_wait_1 ret = null_ptid, " |
2825 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
2826 | debug_exit (); |
2827 | } | |
fa96cb38 PA |
2828 | |
2829 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
2830 | return null_ptid; |
2831 | } | |
fa96cb38 PA |
2832 | else if (pid == -1) |
2833 | { | |
2834 | if (debug_threads) | |
2835 | { | |
2836 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
2837 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
2838 | debug_exit (); | |
2839 | } | |
bd99dc85 | 2840 | |
fa96cb38 PA |
2841 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
2842 | return null_ptid; | |
2843 | } | |
0d62e5e8 | 2844 | |
0bfdf32f | 2845 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 2846 | |
fa96cb38 PA |
2847 | /* linux_wait_for_event only returns an exit status for the last |
2848 | child of a process. Report it. */ | |
2849 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 2850 | { |
fa96cb38 | 2851 | if (WIFEXITED (w)) |
0d62e5e8 | 2852 | { |
fa96cb38 PA |
2853 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
2854 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 2855 | |
fa96cb38 | 2856 | if (debug_threads) |
bd99dc85 | 2857 | { |
fa96cb38 PA |
2858 | debug_printf ("linux_wait_1 ret = %s, exited with " |
2859 | "retcode %d\n", | |
0bfdf32f | 2860 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2861 | WEXITSTATUS (w)); |
2862 | debug_exit (); | |
bd99dc85 | 2863 | } |
fa96cb38 PA |
2864 | } |
2865 | else | |
2866 | { | |
2867 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2868 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 2869 | |
fa96cb38 PA |
2870 | if (debug_threads) |
2871 | { | |
2872 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
2873 | "signal %d\n", | |
0bfdf32f | 2874 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2875 | WTERMSIG (w)); |
2876 | debug_exit (); | |
2877 | } | |
0d62e5e8 | 2878 | } |
fa96cb38 | 2879 | |
0bfdf32f | 2880 | return ptid_of (current_thread); |
da6d8c04 DJ |
2881 | } |
2882 | ||
8090aef2 PA |
2883 | /* If step-over executes a breakpoint instruction, it means a |
2884 | gdb/gdbserver breakpoint had been planted on top of a permanent | |
2885 | breakpoint. The PC has been adjusted by | |
2886 | check_stopped_by_breakpoint to point at the breakpoint address. | |
2887 | Advance the PC manually past the breakpoint, otherwise the | |
2888 | program would keep trapping the permanent breakpoint forever. */ | |
2889 | if (!ptid_equal (step_over_bkpt, null_ptid) | |
15c66dd6 | 2890 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) |
8090aef2 | 2891 | { |
9beb7c4e | 2892 | unsigned int increment_pc = the_low_target.breakpoint_len; |
8090aef2 PA |
2893 | |
2894 | if (debug_threads) | |
2895 | { | |
2896 | debug_printf ("step-over for %s executed software breakpoint\n", | |
2897 | target_pid_to_str (ptid_of (current_thread))); | |
2898 | } | |
2899 | ||
2900 | if (increment_pc != 0) | |
2901 | { | |
2902 | struct regcache *regcache | |
2903 | = get_thread_regcache (current_thread, 1); | |
2904 | ||
2905 | event_child->stop_pc += increment_pc; | |
2906 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2907 | ||
2908 | if (!(*the_low_target.breakpoint_at) (event_child->stop_pc)) | |
15c66dd6 | 2909 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
2910 | } |
2911 | } | |
2912 | ||
6bf5e0ba PA |
2913 | /* If this event was not handled before, and is not a SIGTRAP, we |
2914 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2915 | a breakpoint is inserted at the current PC. If this target does | |
2916 | not support internal breakpoints at all, we also report the | |
2917 | SIGTRAP without further processing; it's of no concern to us. */ | |
2918 | maybe_internal_trap | |
2919 | = (supports_breakpoints () | |
2920 | && (WSTOPSIG (w) == SIGTRAP | |
2921 | || ((WSTOPSIG (w) == SIGILL | |
2922 | || WSTOPSIG (w) == SIGSEGV) | |
2923 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2924 | ||
2925 | if (maybe_internal_trap) | |
2926 | { | |
2927 | /* Handle anything that requires bookkeeping before deciding to | |
2928 | report the event or continue waiting. */ | |
2929 | ||
2930 | /* First check if we can explain the SIGTRAP with an internal | |
2931 | breakpoint, or if we should possibly report the event to GDB. | |
2932 | Do this before anything that may remove or insert a | |
2933 | breakpoint. */ | |
2934 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2935 | ||
2936 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2937 | finished. If so, tweak the state machine accordingly, | |
2938 | reinsert breakpoints and delete any reinsert (software | |
2939 | single-step) breakpoints. */ | |
2940 | step_over_finished = finish_step_over (event_child); | |
2941 | ||
2942 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2943 | check_breakpoints (event_child->stop_pc); | |
2944 | ||
219f2f23 PA |
2945 | /* Handle tracepoint data collecting. This may overflow the |
2946 | trace buffer, and cause a tracing stop, removing | |
2947 | breakpoints. */ | |
2948 | trace_event = handle_tracepoints (event_child); | |
2949 | ||
6bf5e0ba PA |
2950 | if (bp_explains_trap) |
2951 | { | |
2952 | /* If we stepped or ran into an internal breakpoint, we've | |
2953 | already handled it. So next time we resume (from this | |
2954 | PC), we should step over it. */ | |
2955 | if (debug_threads) | |
87ce2a04 | 2956 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2957 | |
8b07ae33 PA |
2958 | if (breakpoint_here (event_child->stop_pc)) |
2959 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2960 | } |
2961 | } | |
2962 | else | |
2963 | { | |
2964 | /* We have some other signal, possibly a step-over dance was in | |
2965 | progress, and it should be cancelled too. */ | |
2966 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2967 | } |
2968 | ||
2969 | /* We have all the data we need. Either report the event to GDB, or | |
2970 | resume threads and keep waiting for more. */ | |
2971 | ||
2972 | /* If we're collecting a fast tracepoint, finish the collection and | |
2973 | move out of the jump pad before delivering a signal. See | |
2974 | linux_stabilize_threads. */ | |
2975 | ||
2976 | if (WIFSTOPPED (w) | |
2977 | && WSTOPSIG (w) != SIGTRAP | |
2978 | && supports_fast_tracepoints () | |
58b4daa5 | 2979 | && agent_loaded_p ()) |
fa593d66 PA |
2980 | { |
2981 | if (debug_threads) | |
87ce2a04 DE |
2982 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
2983 | "to defer or adjust it.\n", | |
0bfdf32f | 2984 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
2985 | |
2986 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 2987 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
2988 | && maybe_move_out_of_jump_pad (event_child, &w)) |
2989 | { | |
2990 | enqueue_one_deferred_signal (event_child, &w); | |
2991 | ||
2992 | if (debug_threads) | |
87ce2a04 | 2993 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 2994 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
2995 | |
2996 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
582511be PA |
2997 | |
2998 | return ignore_event (ourstatus); | |
fa593d66 PA |
2999 | } |
3000 | } | |
219f2f23 | 3001 | |
fa593d66 PA |
3002 | if (event_child->collecting_fast_tracepoint) |
3003 | { | |
3004 | if (debug_threads) | |
87ce2a04 DE |
3005 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
3006 | "Check if we're already there.\n", | |
0bfdf32f | 3007 | lwpid_of (current_thread), |
87ce2a04 | 3008 | event_child->collecting_fast_tracepoint); |
fa593d66 PA |
3009 | |
3010 | trace_event = 1; | |
3011 | ||
3012 | event_child->collecting_fast_tracepoint | |
3013 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3014 | ||
3015 | if (event_child->collecting_fast_tracepoint != 1) | |
3016 | { | |
3017 | /* No longer need this breakpoint. */ | |
3018 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3019 | { | |
3020 | if (debug_threads) | |
87ce2a04 DE |
3021 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
3022 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
3023 | |
3024 | /* Other running threads could hit this breakpoint. | |
3025 | We don't handle moribund locations like GDB does, | |
3026 | instead we always pause all threads when removing | |
3027 | breakpoints, so that any step-over or | |
3028 | decr_pc_after_break adjustment is always taken | |
3029 | care of while the breakpoint is still | |
3030 | inserted. */ | |
3031 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3032 | |
3033 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3034 | event_child->exit_jump_pad_bkpt = NULL; | |
3035 | ||
3036 | unstop_all_lwps (1, event_child); | |
3037 | ||
3038 | gdb_assert (event_child->suspended >= 0); | |
3039 | } | |
3040 | } | |
3041 | ||
3042 | if (event_child->collecting_fast_tracepoint == 0) | |
3043 | { | |
3044 | if (debug_threads) | |
87ce2a04 DE |
3045 | debug_printf ("fast tracepoint finished " |
3046 | "collecting successfully.\n"); | |
fa593d66 PA |
3047 | |
3048 | /* We may have a deferred signal to report. */ | |
3049 | if (dequeue_one_deferred_signal (event_child, &w)) | |
3050 | { | |
3051 | if (debug_threads) | |
87ce2a04 | 3052 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 3053 | } |
3c11dd79 | 3054 | else |
fa593d66 | 3055 | { |
3c11dd79 | 3056 | if (debug_threads) |
87ce2a04 | 3057 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
3058 | |
3059 | if (stabilizing_threads) | |
3060 | { | |
3061 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 3062 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
3063 | |
3064 | if (debug_threads) | |
3065 | { | |
3066 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
3067 | "while stabilizing threads\n", | |
0bfdf32f | 3068 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
3069 | debug_exit (); |
3070 | } | |
3071 | ||
0bfdf32f | 3072 | return ptid_of (current_thread); |
fa593d66 PA |
3073 | } |
3074 | } | |
3075 | } | |
6bf5e0ba PA |
3076 | } |
3077 | ||
e471f25b PA |
3078 | /* Check whether GDB would be interested in this event. */ |
3079 | ||
3080 | /* If GDB is not interested in this signal, don't stop other | |
3081 | threads, and don't report it to GDB. Just resume the inferior | |
3082 | right away. We do this for threading-related signals as well as | |
3083 | any that GDB specifically requested we ignore. But never ignore | |
3084 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3085 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3086 | handler. Also never ignore signals that could be caused by a |
3087 | breakpoint. */ | |
e471f25b PA |
3088 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
3089 | thread library? */ | |
3090 | if (WIFSTOPPED (w) | |
0bfdf32f | 3091 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3092 | && ( |
1a981360 | 3093 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3094 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3095 | && (WSTOPSIG (w) == __SIGRTMIN |
3096 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3097 | || | |
3098 | #endif | |
2ea28649 | 3099 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3100 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3101 | && current_thread->last_resume_kind == resume_stop) |
3102 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3103 | { |
3104 | siginfo_t info, *info_p; | |
3105 | ||
3106 | if (debug_threads) | |
87ce2a04 | 3107 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 3108 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 3109 | |
0bfdf32f | 3110 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3111 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3112 | info_p = &info; |
3113 | else | |
3114 | info_p = NULL; | |
3115 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3116 | WSTOPSIG (w), info_p); | |
582511be | 3117 | return ignore_event (ourstatus); |
e471f25b PA |
3118 | } |
3119 | ||
c2d6af84 PA |
3120 | /* Note that all addresses are always "out of the step range" when |
3121 | there's no range to begin with. */ | |
3122 | in_step_range = lwp_in_step_range (event_child); | |
3123 | ||
3124 | /* If GDB wanted this thread to single step, and the thread is out | |
3125 | of the step range, we always want to report the SIGTRAP, and let | |
3126 | GDB handle it. Watchpoints should always be reported. So should | |
3127 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3128 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3129 | do, we're be able to handle GDB breakpoints on top of internal | |
3130 | breakpoints, by handling the internal breakpoint and still | |
3131 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
3132 | won't see the breakpoint hit. */ | |
6bf5e0ba | 3133 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3134 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3135 | && !in_step_range) |
15c66dd6 | 3136 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
c2d6af84 | 3137 | || (!step_over_finished && !in_step_range |
493e2a69 | 3138 | && !bp_explains_trap && !trace_event) |
9f3a5c85 | 3139 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3140 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e DB |
3141 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
3142 | || extended_event_reported (&event_child->waitstatus)); | |
d3ce09f5 SS |
3143 | |
3144 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3145 | |
3146 | /* We found no reason GDB would want us to stop. We either hit one | |
3147 | of our own breakpoints, or finished an internal step GDB | |
3148 | shouldn't know about. */ | |
3149 | if (!report_to_gdb) | |
3150 | { | |
3151 | if (debug_threads) | |
3152 | { | |
3153 | if (bp_explains_trap) | |
87ce2a04 | 3154 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3155 | if (step_over_finished) |
87ce2a04 | 3156 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 3157 | if (trace_event) |
87ce2a04 | 3158 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 3159 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
3160 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
3161 | paddress (event_child->stop_pc), | |
3162 | paddress (event_child->step_range_start), | |
3163 | paddress (event_child->step_range_end)); | |
de0d863e DB |
3164 | if (extended_event_reported (&event_child->waitstatus)) |
3165 | { | |
3166 | char *str = target_waitstatus_to_string (ourstatus); | |
3167 | debug_printf ("LWP %ld: extended event with waitstatus %s\n", | |
3168 | lwpid_of (get_lwp_thread (event_child)), str); | |
3169 | xfree (str); | |
3170 | } | |
6bf5e0ba PA |
3171 | } |
3172 | ||
3173 | /* We're not reporting this breakpoint to GDB, so apply the | |
3174 | decr_pc_after_break adjustment to the inferior's regcache | |
3175 | ourselves. */ | |
3176 | ||
3177 | if (the_low_target.set_pc != NULL) | |
3178 | { | |
3179 | struct regcache *regcache | |
0bfdf32f | 3180 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
3181 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
3182 | } | |
3183 | ||
7984d532 PA |
3184 | /* We may have finished stepping over a breakpoint. If so, |
3185 | we've stopped and suspended all LWPs momentarily except the | |
3186 | stepping one. This is where we resume them all again. We're | |
3187 | going to keep waiting, so use proceed, which handles stepping | |
3188 | over the next breakpoint. */ | |
6bf5e0ba | 3189 | if (debug_threads) |
87ce2a04 | 3190 | debug_printf ("proceeding all threads.\n"); |
7984d532 PA |
3191 | |
3192 | if (step_over_finished) | |
3193 | unsuspend_all_lwps (event_child); | |
3194 | ||
6bf5e0ba | 3195 | proceed_all_lwps (); |
582511be | 3196 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3197 | } |
3198 | ||
3199 | if (debug_threads) | |
3200 | { | |
0bfdf32f | 3201 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
3202 | { |
3203 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 3204 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 3205 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 3206 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 3207 | } |
15c66dd6 | 3208 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 3209 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 3210 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 3211 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 3212 | if (debug_threads) |
87ce2a04 | 3213 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
3214 | } |
3215 | ||
3216 | /* Alright, we're going to report a stop. */ | |
3217 | ||
582511be | 3218 | if (!stabilizing_threads) |
6bf5e0ba PA |
3219 | { |
3220 | /* In all-stop, stop all threads. */ | |
582511be PA |
3221 | if (!non_stop) |
3222 | stop_all_lwps (0, NULL); | |
6bf5e0ba PA |
3223 | |
3224 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3225 | from among those that have had events. Giving equal priority | |
3226 | to all LWPs that have had events helps prevent | |
3227 | starvation. */ | |
3228 | if (ptid_equal (ptid, minus_one_ptid)) | |
3229 | { | |
3230 | event_child->status_pending_p = 1; | |
3231 | event_child->status_pending = w; | |
3232 | ||
3233 | select_event_lwp (&event_child); | |
3234 | ||
0bfdf32f GB |
3235 | /* current_thread and event_child must stay in sync. */ |
3236 | current_thread = get_lwp_thread (event_child); | |
ee1e2d4f | 3237 | |
6bf5e0ba PA |
3238 | event_child->status_pending_p = 0; |
3239 | w = event_child->status_pending; | |
3240 | } | |
3241 | ||
c03e6ccc | 3242 | if (step_over_finished) |
582511be PA |
3243 | { |
3244 | if (!non_stop) | |
3245 | { | |
3246 | /* If we were doing a step-over, all other threads but | |
3247 | the stepping one had been paused in start_step_over, | |
3248 | with their suspend counts incremented. We don't want | |
3249 | to do a full unstop/unpause, because we're in | |
3250 | all-stop mode (so we want threads stopped), but we | |
3251 | still need to unsuspend the other threads, to | |
3252 | decrement their `suspended' count back. */ | |
3253 | unsuspend_all_lwps (event_child); | |
3254 | } | |
3255 | else | |
3256 | { | |
3257 | /* If we just finished a step-over, then all threads had | |
3258 | been momentarily paused. In all-stop, that's fine, | |
3259 | we want threads stopped by now anyway. In non-stop, | |
3260 | we need to re-resume threads that GDB wanted to be | |
3261 | running. */ | |
3262 | unstop_all_lwps (1, event_child); | |
3263 | } | |
3264 | } | |
c03e6ccc | 3265 | |
fa593d66 | 3266 | /* Stabilize threads (move out of jump pads). */ |
582511be PA |
3267 | if (!non_stop) |
3268 | stabilize_threads (); | |
6bf5e0ba PA |
3269 | } |
3270 | else | |
3271 | { | |
3272 | /* If we just finished a step-over, then all threads had been | |
3273 | momentarily paused. In all-stop, that's fine, we want | |
3274 | threads stopped by now anyway. In non-stop, we need to | |
3275 | re-resume threads that GDB wanted to be running. */ | |
3276 | if (step_over_finished) | |
7984d532 | 3277 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3278 | } |
3279 | ||
de0d863e DB |
3280 | if (extended_event_reported (&event_child->waitstatus)) |
3281 | { | |
3282 | /* If the reported event is a fork, vfork or exec, let GDB know. */ | |
3283 | ourstatus->kind = event_child->waitstatus.kind; | |
3284 | ourstatus->value = event_child->waitstatus.value; | |
3285 | ||
3286 | /* Clear the event lwp's waitstatus since we handled it already. */ | |
3287 | event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3288 | } | |
3289 | else | |
3290 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
5b1c542e | 3291 | |
582511be | 3292 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3293 | it was a software breakpoint, and the client doesn't know we can |
3294 | adjust the breakpoint ourselves. */ | |
3295 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3296 | && !swbreak_feature) | |
582511be PA |
3297 | { |
3298 | int decr_pc = the_low_target.decr_pc_after_break; | |
3299 | ||
3300 | if (decr_pc != 0) | |
3301 | { | |
3302 | struct regcache *regcache | |
3303 | = get_thread_regcache (current_thread, 1); | |
3304 | (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc); | |
3305 | } | |
3306 | } | |
3307 | ||
0bfdf32f | 3308 | if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3309 | && WSTOPSIG (w) == SIGSTOP) |
bd99dc85 PA |
3310 | { |
3311 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3312 | and it stopped cleanly, so report as SIG0. The use of | |
3313 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3314 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3315 | } |
0bfdf32f | 3316 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3317 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3318 | { |
3319 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3320 | but, it stopped for other reasons. */ |
2ea28649 | 3321 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 | 3322 | } |
de0d863e | 3323 | else if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
bd99dc85 | 3324 | { |
2ea28649 | 3325 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3326 | } |
3327 | ||
d50171e4 PA |
3328 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
3329 | ||
bd99dc85 | 3330 | if (debug_threads) |
87ce2a04 DE |
3331 | { |
3332 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
0bfdf32f | 3333 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3334 | ourstatus->kind, ourstatus->value.sig); |
3335 | debug_exit (); | |
3336 | } | |
bd99dc85 | 3337 | |
0bfdf32f | 3338 | return ptid_of (current_thread); |
bd99dc85 PA |
3339 | } |
3340 | ||
3341 | /* Get rid of any pending event in the pipe. */ | |
3342 | static void | |
3343 | async_file_flush (void) | |
3344 | { | |
3345 | int ret; | |
3346 | char buf; | |
3347 | ||
3348 | do | |
3349 | ret = read (linux_event_pipe[0], &buf, 1); | |
3350 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3351 | } | |
3352 | ||
3353 | /* Put something in the pipe, so the event loop wakes up. */ | |
3354 | static void | |
3355 | async_file_mark (void) | |
3356 | { | |
3357 | int ret; | |
3358 | ||
3359 | async_file_flush (); | |
3360 | ||
3361 | do | |
3362 | ret = write (linux_event_pipe[1], "+", 1); | |
3363 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3364 | ||
3365 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3366 | be awakened anyway. */ | |
3367 | } | |
3368 | ||
95954743 PA |
3369 | static ptid_t |
3370 | linux_wait (ptid_t ptid, | |
3371 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 3372 | { |
95954743 | 3373 | ptid_t event_ptid; |
bd99dc85 | 3374 | |
bd99dc85 PA |
3375 | /* Flush the async file first. */ |
3376 | if (target_is_async_p ()) | |
3377 | async_file_flush (); | |
3378 | ||
582511be PA |
3379 | do |
3380 | { | |
3381 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); | |
3382 | } | |
3383 | while ((target_options & TARGET_WNOHANG) == 0 | |
3384 | && ptid_equal (event_ptid, null_ptid) | |
3385 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); | |
bd99dc85 PA |
3386 | |
3387 | /* If at least one stop was reported, there may be more. A single | |
3388 | SIGCHLD can signal more than one child stop. */ | |
3389 | if (target_is_async_p () | |
3390 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 3391 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
3392 | async_file_mark (); |
3393 | ||
3394 | return event_ptid; | |
da6d8c04 DJ |
3395 | } |
3396 | ||
c5f62d5f | 3397 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3398 | |
3399 | static int | |
a1928bad | 3400 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3401 | { |
c5f62d5f DE |
3402 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
3403 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 3404 | |
c5f62d5f DE |
3405 | #ifdef __NR_tkill |
3406 | { | |
3407 | static int tkill_failed; | |
fd500816 | 3408 | |
c5f62d5f DE |
3409 | if (!tkill_failed) |
3410 | { | |
3411 | int ret; | |
3412 | ||
3413 | errno = 0; | |
3414 | ret = syscall (__NR_tkill, lwpid, signo); | |
3415 | if (errno != ENOSYS) | |
3416 | return ret; | |
3417 | tkill_failed = 1; | |
3418 | } | |
3419 | } | |
fd500816 DJ |
3420 | #endif |
3421 | ||
3422 | return kill (lwpid, signo); | |
3423 | } | |
3424 | ||
964e4306 PA |
3425 | void |
3426 | linux_stop_lwp (struct lwp_info *lwp) | |
3427 | { | |
3428 | send_sigstop (lwp); | |
3429 | } | |
3430 | ||
0d62e5e8 | 3431 | static void |
02fc4de7 | 3432 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3433 | { |
bd99dc85 | 3434 | int pid; |
0d62e5e8 | 3435 | |
d86d4aaf | 3436 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3437 | |
0d62e5e8 DJ |
3438 | /* If we already have a pending stop signal for this process, don't |
3439 | send another. */ | |
54a0b537 | 3440 | if (lwp->stop_expected) |
0d62e5e8 | 3441 | { |
ae13219e | 3442 | if (debug_threads) |
87ce2a04 | 3443 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3444 | |
0d62e5e8 DJ |
3445 | return; |
3446 | } | |
3447 | ||
3448 | if (debug_threads) | |
87ce2a04 | 3449 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3450 | |
d50171e4 | 3451 | lwp->stop_expected = 1; |
bd99dc85 | 3452 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3453 | } |
3454 | ||
7984d532 PA |
3455 | static int |
3456 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 | 3457 | { |
d86d4aaf DE |
3458 | struct thread_info *thread = (struct thread_info *) entry; |
3459 | struct lwp_info *lwp = get_thread_lwp (thread); | |
02fc4de7 | 3460 | |
7984d532 PA |
3461 | /* Ignore EXCEPT. */ |
3462 | if (lwp == except) | |
3463 | return 0; | |
3464 | ||
02fc4de7 | 3465 | if (lwp->stopped) |
7984d532 | 3466 | return 0; |
02fc4de7 PA |
3467 | |
3468 | send_sigstop (lwp); | |
7984d532 PA |
3469 | return 0; |
3470 | } | |
3471 | ||
3472 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3473 | yet. */ | |
3474 | static int | |
3475 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
3476 | void *except) | |
3477 | { | |
d86d4aaf DE |
3478 | struct thread_info *thread = (struct thread_info *) entry; |
3479 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
3480 | |
3481 | /* Ignore EXCEPT. */ | |
3482 | if (lwp == except) | |
3483 | return 0; | |
3484 | ||
3485 | lwp->suspended++; | |
3486 | ||
3487 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
3488 | } |
3489 | ||
95954743 PA |
3490 | static void |
3491 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3492 | { | |
3493 | /* It's dead, really. */ | |
3494 | lwp->dead = 1; | |
3495 | ||
3496 | /* Store the exit status for later. */ | |
3497 | lwp->status_pending_p = 1; | |
3498 | lwp->status_pending = wstat; | |
3499 | ||
95954743 PA |
3500 | /* Prevent trying to stop it. */ |
3501 | lwp->stopped = 1; | |
3502 | ||
3503 | /* No further stops are expected from a dead lwp. */ | |
3504 | lwp->stop_expected = 0; | |
3505 | } | |
3506 | ||
fa96cb38 PA |
3507 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
3508 | ||
0d62e5e8 | 3509 | static void |
fa96cb38 | 3510 | wait_for_sigstop (void) |
0d62e5e8 | 3511 | { |
0bfdf32f | 3512 | struct thread_info *saved_thread; |
95954743 | 3513 | ptid_t saved_tid; |
fa96cb38 PA |
3514 | int wstat; |
3515 | int ret; | |
0d62e5e8 | 3516 | |
0bfdf32f GB |
3517 | saved_thread = current_thread; |
3518 | if (saved_thread != NULL) | |
3519 | saved_tid = saved_thread->entry.id; | |
bd99dc85 | 3520 | else |
95954743 | 3521 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3522 | |
d50171e4 | 3523 | if (debug_threads) |
fa96cb38 | 3524 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3525 | |
fa96cb38 PA |
3526 | /* Passing NULL_PTID as filter indicates we want all events to be |
3527 | left pending. Eventually this returns when there are no | |
3528 | unwaited-for children left. */ | |
3529 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
3530 | &wstat, __WALL); | |
3531 | gdb_assert (ret == -1); | |
0d62e5e8 | 3532 | |
0bfdf32f GB |
3533 | if (saved_thread == NULL || linux_thread_alive (saved_tid)) |
3534 | current_thread = saved_thread; | |
0d62e5e8 DJ |
3535 | else |
3536 | { | |
3537 | if (debug_threads) | |
87ce2a04 | 3538 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3539 | |
bd99dc85 PA |
3540 | if (non_stop) |
3541 | { | |
3542 | /* We can't change the current inferior behind GDB's back, | |
3543 | otherwise, a subsequent command may apply to the wrong | |
3544 | process. */ | |
0bfdf32f | 3545 | current_thread = NULL; |
bd99dc85 PA |
3546 | } |
3547 | else | |
3548 | { | |
3549 | /* Set a valid thread as current. */ | |
0bfdf32f | 3550 | set_desired_thread (0); |
bd99dc85 | 3551 | } |
0d62e5e8 DJ |
3552 | } |
3553 | } | |
3554 | ||
fa593d66 PA |
3555 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3556 | move it out, because we need to report the stop event to GDB. For | |
3557 | example, if the user puts a breakpoint in the jump pad, it's | |
3558 | because she wants to debug it. */ | |
3559 | ||
3560 | static int | |
3561 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3562 | { | |
d86d4aaf DE |
3563 | struct thread_info *thread = (struct thread_info *) entry; |
3564 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3565 | |
3566 | gdb_assert (lwp->suspended == 0); | |
3567 | gdb_assert (lwp->stopped); | |
3568 | ||
3569 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3570 | return (supports_fast_tracepoints () | |
58b4daa5 | 3571 | && agent_loaded_p () |
fa593d66 | 3572 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 3573 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3574 | || thread->last_resume_kind == resume_step) |
3575 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3576 | } | |
3577 | ||
3578 | static void | |
3579 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3580 | { | |
d86d4aaf DE |
3581 | struct thread_info *thread = (struct thread_info *) entry; |
3582 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3583 | int *wstat; |
3584 | ||
3585 | gdb_assert (lwp->suspended == 0); | |
3586 | gdb_assert (lwp->stopped); | |
3587 | ||
3588 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3589 | ||
3590 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3591 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 3592 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3593 | && thread->last_resume_kind != resume_step |
3594 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3595 | { | |
3596 | if (debug_threads) | |
87ce2a04 | 3597 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3598 | lwpid_of (thread)); |
fa593d66 PA |
3599 | |
3600 | if (wstat) | |
3601 | { | |
3602 | lwp->status_pending_p = 0; | |
3603 | enqueue_one_deferred_signal (lwp, wstat); | |
3604 | ||
3605 | if (debug_threads) | |
87ce2a04 DE |
3606 | debug_printf ("Signal %d for LWP %ld deferred " |
3607 | "(in jump pad)\n", | |
d86d4aaf | 3608 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
3609 | } |
3610 | ||
3611 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3612 | } | |
3613 | else | |
3614 | lwp->suspended++; | |
3615 | } | |
3616 | ||
3617 | static int | |
3618 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3619 | { | |
d86d4aaf DE |
3620 | struct thread_info *thread = (struct thread_info *) entry; |
3621 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3622 | |
3623 | if (lwp->dead) | |
3624 | return 0; | |
3625 | if (lwp->stopped) | |
3626 | return 0; | |
3627 | return 1; | |
3628 | } | |
3629 | ||
7984d532 PA |
3630 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3631 | If SUSPEND, then also increase the suspend count of every LWP, | |
3632 | except EXCEPT. */ | |
3633 | ||
0d62e5e8 | 3634 | static void |
7984d532 | 3635 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3636 | { |
bde24c0a PA |
3637 | /* Should not be called recursively. */ |
3638 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3639 | ||
87ce2a04 DE |
3640 | if (debug_threads) |
3641 | { | |
3642 | debug_enter (); | |
3643 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
3644 | suspend ? "stop-and-suspend" : "stop", | |
3645 | except != NULL | |
d86d4aaf | 3646 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
3647 | : "none"); |
3648 | } | |
3649 | ||
bde24c0a PA |
3650 | stopping_threads = (suspend |
3651 | ? STOPPING_AND_SUSPENDING_THREADS | |
3652 | : STOPPING_THREADS); | |
7984d532 PA |
3653 | |
3654 | if (suspend) | |
d86d4aaf | 3655 | find_inferior (&all_threads, suspend_and_send_sigstop_callback, except); |
7984d532 | 3656 | else |
d86d4aaf | 3657 | find_inferior (&all_threads, send_sigstop_callback, except); |
fa96cb38 | 3658 | wait_for_sigstop (); |
bde24c0a | 3659 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
3660 | |
3661 | if (debug_threads) | |
3662 | { | |
3663 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
3664 | "back to !stopping\n"); | |
3665 | debug_exit (); | |
3666 | } | |
0d62e5e8 DJ |
3667 | } |
3668 | ||
23f238d3 PA |
3669 | /* Resume execution of LWP. If STEP is nonzero, single-step it. If |
3670 | SIGNAL is nonzero, give it that signal. */ | |
da6d8c04 | 3671 | |
ce3a066d | 3672 | static void |
23f238d3 PA |
3673 | linux_resume_one_lwp_throw (struct lwp_info *lwp, |
3674 | int step, int signal, siginfo_t *info) | |
da6d8c04 | 3675 | { |
d86d4aaf | 3676 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 3677 | struct thread_info *saved_thread; |
fa593d66 | 3678 | int fast_tp_collecting; |
0d62e5e8 | 3679 | |
54a0b537 | 3680 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3681 | return; |
3682 | ||
fa593d66 PA |
3683 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3684 | ||
3685 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3686 | ||
219f2f23 PA |
3687 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3688 | user used the "jump" command, or "set $pc = foo"). */ | |
3689 | if (lwp->stop_pc != get_pc (lwp)) | |
3690 | { | |
3691 | /* Collecting 'while-stepping' actions doesn't make sense | |
3692 | anymore. */ | |
d86d4aaf | 3693 | release_while_stepping_state_list (thread); |
219f2f23 PA |
3694 | } |
3695 | ||
0d62e5e8 DJ |
3696 | /* If we have pending signals or status, and a new signal, enqueue the |
3697 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3698 | breakpoint; it will be picked up again below. */ | |
3699 | if (signal != 0 | |
fa593d66 PA |
3700 | && (lwp->status_pending_p |
3701 | || lwp->pending_signals != NULL | |
3702 | || lwp->bp_reinsert != 0 | |
3703 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3704 | { |
3705 | struct pending_signals *p_sig; | |
bca929d3 | 3706 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3707 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3708 | p_sig->signal = signal; |
32ca6d61 DJ |
3709 | if (info == NULL) |
3710 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3711 | else | |
3712 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3713 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3714 | } |
3715 | ||
d50171e4 PA |
3716 | if (lwp->status_pending_p) |
3717 | { | |
3718 | if (debug_threads) | |
87ce2a04 DE |
3719 | debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);" |
3720 | " has pending status\n", | |
d86d4aaf | 3721 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3722 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
3723 | return; |
3724 | } | |
0d62e5e8 | 3725 | |
0bfdf32f GB |
3726 | saved_thread = current_thread; |
3727 | current_thread = thread; | |
0d62e5e8 DJ |
3728 | |
3729 | if (debug_threads) | |
87ce2a04 | 3730 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", |
d86d4aaf | 3731 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3732 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3733 | |
3734 | /* This bit needs some thinking about. If we get a signal that | |
3735 | we must report while a single-step reinsert is still pending, | |
3736 | we often end up resuming the thread. It might be better to | |
3737 | (ew) allow a stack of pending events; then we could be sure that | |
3738 | the reinsert happened right away and not lose any signals. | |
3739 | ||
3740 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3741 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3742 | complete correctness, so it won't solve that problem. It may be |
3743 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3744 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3745 | { |
3746 | if (debug_threads) | |
87ce2a04 DE |
3747 | debug_printf (" pending reinsert at 0x%s\n", |
3748 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 3749 | |
85e00e85 | 3750 | if (can_hardware_single_step ()) |
d50171e4 | 3751 | { |
fa593d66 PA |
3752 | if (fast_tp_collecting == 0) |
3753 | { | |
3754 | if (step == 0) | |
3755 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3756 | if (lwp->suspended) | |
3757 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3758 | lwp->suspended); | |
3759 | } | |
d50171e4 PA |
3760 | |
3761 | step = 1; | |
3762 | } | |
0d62e5e8 DJ |
3763 | |
3764 | /* Postpone any pending signal. It was enqueued above. */ | |
3765 | signal = 0; | |
3766 | } | |
3767 | ||
fa593d66 PA |
3768 | if (fast_tp_collecting == 1) |
3769 | { | |
3770 | if (debug_threads) | |
87ce2a04 DE |
3771 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3772 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 3773 | lwpid_of (thread)); |
fa593d66 PA |
3774 | |
3775 | /* Postpone any pending signal. It was enqueued above. */ | |
3776 | signal = 0; | |
3777 | } | |
3778 | else if (fast_tp_collecting == 2) | |
3779 | { | |
3780 | if (debug_threads) | |
87ce2a04 DE |
3781 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3782 | " single-stepping\n", | |
d86d4aaf | 3783 | lwpid_of (thread)); |
fa593d66 PA |
3784 | |
3785 | if (can_hardware_single_step ()) | |
3786 | step = 1; | |
3787 | else | |
38e08fca GB |
3788 | { |
3789 | internal_error (__FILE__, __LINE__, | |
3790 | "moving out of jump pad single-stepping" | |
3791 | " not implemented on this target"); | |
3792 | } | |
fa593d66 PA |
3793 | |
3794 | /* Postpone any pending signal. It was enqueued above. */ | |
3795 | signal = 0; | |
3796 | } | |
3797 | ||
219f2f23 PA |
3798 | /* If we have while-stepping actions in this thread set it stepping. |
3799 | If we have a signal to deliver, it may or may not be set to | |
3800 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3801 | while-stepping into a signal handler. A possible smart thing to | |
3802 | do would be to set an internal breakpoint at the signal return | |
3803 | address, continue, and carry on catching this while-stepping | |
3804 | action only when that breakpoint is hit. A future | |
3805 | enhancement. */ | |
d86d4aaf | 3806 | if (thread->while_stepping != NULL |
219f2f23 PA |
3807 | && can_hardware_single_step ()) |
3808 | { | |
3809 | if (debug_threads) | |
87ce2a04 | 3810 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 3811 | lwpid_of (thread)); |
219f2f23 PA |
3812 | step = 1; |
3813 | } | |
3814 | ||
582511be | 3815 | if (the_low_target.get_pc != NULL) |
0d62e5e8 | 3816 | { |
0bfdf32f | 3817 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be PA |
3818 | |
3819 | lwp->stop_pc = (*the_low_target.get_pc) (regcache); | |
3820 | ||
3821 | if (debug_threads) | |
3822 | { | |
3823 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
3824 | (long) lwp->stop_pc); | |
3825 | } | |
0d62e5e8 DJ |
3826 | } |
3827 | ||
fa593d66 PA |
3828 | /* If we have pending signals, consume one unless we are trying to |
3829 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3830 | collect. */ | |
3831 | if (lwp->pending_signals != NULL | |
3832 | && lwp->bp_reinsert == 0 | |
3833 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3834 | { |
3835 | struct pending_signals **p_sig; | |
3836 | ||
54a0b537 | 3837 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3838 | while ((*p_sig)->prev != NULL) |
3839 | p_sig = &(*p_sig)->prev; | |
3840 | ||
3841 | signal = (*p_sig)->signal; | |
32ca6d61 | 3842 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 3843 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3844 | &(*p_sig)->info); |
32ca6d61 | 3845 | |
0d62e5e8 DJ |
3846 | free (*p_sig); |
3847 | *p_sig = NULL; | |
3848 | } | |
3849 | ||
aa5ca48f DE |
3850 | if (the_low_target.prepare_to_resume != NULL) |
3851 | the_low_target.prepare_to_resume (lwp); | |
3852 | ||
d86d4aaf | 3853 | regcache_invalidate_thread (thread); |
da6d8c04 | 3854 | errno = 0; |
54a0b537 | 3855 | lwp->stepping = step; |
d86d4aaf | 3856 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (thread), |
b8e1b30e | 3857 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
3858 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3859 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 3860 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 3861 | |
0bfdf32f | 3862 | current_thread = saved_thread; |
da6d8c04 | 3863 | if (errno) |
23f238d3 PA |
3864 | perror_with_name ("resuming thread"); |
3865 | ||
3866 | /* Successfully resumed. Clear state that no longer makes sense, | |
3867 | and mark the LWP as running. Must not do this before resuming | |
3868 | otherwise if that fails other code will be confused. E.g., we'd | |
3869 | later try to stop the LWP and hang forever waiting for a stop | |
3870 | status. Note that we must not throw after this is cleared, | |
3871 | otherwise handle_zombie_lwp_error would get confused. */ | |
3872 | lwp->stopped = 0; | |
3873 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3874 | } | |
3875 | ||
3876 | /* Called when we try to resume a stopped LWP and that errors out. If | |
3877 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
3878 | or about to become), discard the error, clear any pending status | |
3879 | the LWP may have, and return true (we'll collect the exit status | |
3880 | soon enough). Otherwise, return false. */ | |
3881 | ||
3882 | static int | |
3883 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
3884 | { | |
3885 | struct thread_info *thread = get_lwp_thread (lp); | |
3886 | ||
3887 | /* If we get an error after resuming the LWP successfully, we'd | |
3888 | confuse !T state for the LWP being gone. */ | |
3889 | gdb_assert (lp->stopped); | |
3890 | ||
3891 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
3892 | because even if ptrace failed with ESRCH, the tracee may be "not | |
3893 | yet fully dead", but already refusing ptrace requests. In that | |
3894 | case the tracee has 'R (Running)' state for a little bit | |
3895 | (observed in Linux 3.18). See also the note on ESRCH in the | |
3896 | ptrace(2) man page. Instead, check whether the LWP has any state | |
3897 | other than ptrace-stopped. */ | |
3898 | ||
3899 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
3900 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 3901 | { |
23f238d3 PA |
3902 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
3903 | lp->status_pending_p = 0; | |
3904 | return 1; | |
3905 | } | |
3906 | return 0; | |
3907 | } | |
3908 | ||
3909 | /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP | |
3910 | disappears while we try to resume it. */ | |
3221518c | 3911 | |
23f238d3 PA |
3912 | static void |
3913 | linux_resume_one_lwp (struct lwp_info *lwp, | |
3914 | int step, int signal, siginfo_t *info) | |
3915 | { | |
3916 | TRY | |
3917 | { | |
3918 | linux_resume_one_lwp_throw (lwp, step, signal, info); | |
3919 | } | |
3920 | CATCH (ex, RETURN_MASK_ERROR) | |
3921 | { | |
3922 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
3923 | throw_exception (ex); | |
3221518c | 3924 | } |
23f238d3 | 3925 | END_CATCH |
da6d8c04 DJ |
3926 | } |
3927 | ||
2bd7c093 PA |
3928 | struct thread_resume_array |
3929 | { | |
3930 | struct thread_resume *resume; | |
3931 | size_t n; | |
3932 | }; | |
64386c31 | 3933 | |
ebcf782c DE |
3934 | /* This function is called once per thread via find_inferior. |
3935 | ARG is a pointer to a thread_resume_array struct. | |
3936 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
3937 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
3938 | |
3939 | This algorithm is O(threads * resume elements), but resume elements | |
3940 | is small (and will remain small at least until GDB supports thread | |
3941 | suspension). */ | |
ebcf782c | 3942 | |
2bd7c093 PA |
3943 | static int |
3944 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3945 | { |
d86d4aaf DE |
3946 | struct thread_info *thread = (struct thread_info *) entry; |
3947 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3948 | int ndx; |
2bd7c093 | 3949 | struct thread_resume_array *r; |
64386c31 | 3950 | |
2bd7c093 | 3951 | r = arg; |
64386c31 | 3952 | |
2bd7c093 | 3953 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3954 | { |
3955 | ptid_t ptid = r->resume[ndx].thread; | |
3956 | if (ptid_equal (ptid, minus_one_ptid) | |
3957 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
3958 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
3959 | of PID'. */ | |
d86d4aaf | 3960 | || (ptid_get_pid (ptid) == pid_of (thread) |
0c9070b3 YQ |
3961 | && (ptid_is_pid (ptid) |
3962 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 3963 | { |
d50171e4 | 3964 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3965 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3966 | { |
3967 | if (debug_threads) | |
87ce2a04 DE |
3968 | debug_printf ("already %s LWP %ld at GDB's request\n", |
3969 | (thread->last_status.kind | |
3970 | == TARGET_WAITKIND_STOPPED) | |
3971 | ? "stopped" | |
3972 | : "stopping", | |
d86d4aaf | 3973 | lwpid_of (thread)); |
d50171e4 PA |
3974 | |
3975 | continue; | |
3976 | } | |
3977 | ||
95954743 | 3978 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3979 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 3980 | |
c2d6af84 PA |
3981 | lwp->step_range_start = lwp->resume->step_range_start; |
3982 | lwp->step_range_end = lwp->resume->step_range_end; | |
3983 | ||
fa593d66 PA |
3984 | /* If we had a deferred signal to report, dequeue one now. |
3985 | This can happen if LWP gets more than one signal while | |
3986 | trying to get out of a jump pad. */ | |
3987 | if (lwp->stopped | |
3988 | && !lwp->status_pending_p | |
3989 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3990 | { | |
3991 | lwp->status_pending_p = 1; | |
3992 | ||
3993 | if (debug_threads) | |
87ce2a04 DE |
3994 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
3995 | "leaving status pending.\n", | |
d86d4aaf DE |
3996 | WSTOPSIG (lwp->status_pending), |
3997 | lwpid_of (thread)); | |
fa593d66 PA |
3998 | } |
3999 | ||
95954743 PA |
4000 | return 0; |
4001 | } | |
4002 | } | |
2bd7c093 PA |
4003 | |
4004 | /* No resume action for this thread. */ | |
4005 | lwp->resume = NULL; | |
64386c31 | 4006 | |
2bd7c093 | 4007 | return 0; |
5544ad89 DJ |
4008 | } |
4009 | ||
20ad9378 DE |
4010 | /* find_inferior callback for linux_resume. |
4011 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 4012 | |
bd99dc85 PA |
4013 | static int |
4014 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 4015 | { |
d86d4aaf DE |
4016 | struct thread_info *thread = (struct thread_info *) entry; |
4017 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 4018 | |
bd99dc85 PA |
4019 | /* LWPs which will not be resumed are not interesting, because |
4020 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4021 | if (lwp->resume == NULL) |
bd99dc85 | 4022 | return 0; |
64386c31 | 4023 | |
582511be | 4024 | if (thread_still_has_status_pending_p (thread)) |
d50171e4 PA |
4025 | * (int *) flag_p = 1; |
4026 | ||
4027 | return 0; | |
4028 | } | |
4029 | ||
4030 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
4031 | internal breakpoint that we need to step over. It assumes that any | |
4032 | required STOP_PC adjustment has already been propagated to the | |
4033 | inferior's regcache. */ | |
4034 | ||
4035 | static int | |
4036 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
4037 | { | |
d86d4aaf DE |
4038 | struct thread_info *thread = (struct thread_info *) entry; |
4039 | struct lwp_info *lwp = get_thread_lwp (thread); | |
0bfdf32f | 4040 | struct thread_info *saved_thread; |
d50171e4 PA |
4041 | CORE_ADDR pc; |
4042 | ||
4043 | /* LWPs which will not be resumed are not interesting, because we | |
4044 | might not wait for them next time through linux_wait. */ | |
4045 | ||
4046 | if (!lwp->stopped) | |
4047 | { | |
4048 | if (debug_threads) | |
87ce2a04 | 4049 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 4050 | lwpid_of (thread)); |
d50171e4 PA |
4051 | return 0; |
4052 | } | |
4053 | ||
8336d594 | 4054 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4055 | { |
4056 | if (debug_threads) | |
87ce2a04 DE |
4057 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
4058 | " stopped\n", | |
d86d4aaf | 4059 | lwpid_of (thread)); |
d50171e4 PA |
4060 | return 0; |
4061 | } | |
4062 | ||
7984d532 PA |
4063 | gdb_assert (lwp->suspended >= 0); |
4064 | ||
4065 | if (lwp->suspended) | |
4066 | { | |
4067 | if (debug_threads) | |
87ce2a04 | 4068 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 4069 | lwpid_of (thread)); |
7984d532 PA |
4070 | return 0; |
4071 | } | |
4072 | ||
d50171e4 PA |
4073 | if (!lwp->need_step_over) |
4074 | { | |
4075 | if (debug_threads) | |
d86d4aaf | 4076 | debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread)); |
d50171e4 | 4077 | } |
5544ad89 | 4078 | |
bd99dc85 | 4079 | if (lwp->status_pending_p) |
d50171e4 PA |
4080 | { |
4081 | if (debug_threads) | |
87ce2a04 DE |
4082 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
4083 | " status.\n", | |
d86d4aaf | 4084 | lwpid_of (thread)); |
d50171e4 PA |
4085 | return 0; |
4086 | } | |
4087 | ||
4088 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4089 | or we have. */ | |
4090 | pc = get_pc (lwp); | |
4091 | ||
4092 | /* If the PC has changed since we stopped, then don't do anything, | |
4093 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4094 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4095 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4096 | command, or poked thread's registers herself. */ | |
4097 | if (pc != lwp->stop_pc) | |
4098 | { | |
4099 | if (debug_threads) | |
87ce2a04 DE |
4100 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
4101 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
4102 | lwpid_of (thread), |
4103 | paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
4104 | |
4105 | lwp->need_step_over = 0; | |
4106 | return 0; | |
4107 | } | |
4108 | ||
0bfdf32f GB |
4109 | saved_thread = current_thread; |
4110 | current_thread = thread; | |
d50171e4 | 4111 | |
8b07ae33 | 4112 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4113 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4114 | { |
8b07ae33 | 4115 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4116 | though. If the condition is being evaluated on the target's side |
4117 | and it evaluate to false, step over this breakpoint as well. */ | |
4118 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4119 | && gdb_condition_true_at_breakpoint (pc) |
4120 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
4121 | { |
4122 | if (debug_threads) | |
87ce2a04 DE |
4123 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
4124 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 4125 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4126 | |
0bfdf32f | 4127 | current_thread = saved_thread; |
8b07ae33 PA |
4128 | return 0; |
4129 | } | |
4130 | else | |
4131 | { | |
4132 | if (debug_threads) | |
87ce2a04 DE |
4133 | debug_printf ("Need step over [LWP %ld]? yes, " |
4134 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 4135 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4136 | |
8b07ae33 PA |
4137 | /* We've found an lwp that needs stepping over --- return 1 so |
4138 | that find_inferior stops looking. */ | |
0bfdf32f | 4139 | current_thread = saved_thread; |
8b07ae33 PA |
4140 | |
4141 | /* If the step over is cancelled, this is set again. */ | |
4142 | lwp->need_step_over = 0; | |
4143 | return 1; | |
4144 | } | |
d50171e4 PA |
4145 | } |
4146 | ||
0bfdf32f | 4147 | current_thread = saved_thread; |
d50171e4 PA |
4148 | |
4149 | if (debug_threads) | |
87ce2a04 DE |
4150 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
4151 | " at 0x%s\n", | |
d86d4aaf | 4152 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 4153 | |
bd99dc85 | 4154 | return 0; |
5544ad89 DJ |
4155 | } |
4156 | ||
d50171e4 PA |
4157 | /* Start a step-over operation on LWP. When LWP stopped at a |
4158 | breakpoint, to make progress, we need to remove the breakpoint out | |
4159 | of the way. If we let other threads run while we do that, they may | |
4160 | pass by the breakpoint location and miss hitting it. To avoid | |
4161 | that, a step-over momentarily stops all threads while LWP is | |
4162 | single-stepped while the breakpoint is temporarily uninserted from | |
4163 | the inferior. When the single-step finishes, we reinsert the | |
4164 | breakpoint, and let all threads that are supposed to be running, | |
4165 | run again. | |
4166 | ||
4167 | On targets that don't support hardware single-step, we don't | |
4168 | currently support full software single-stepping. Instead, we only | |
4169 | support stepping over the thread event breakpoint, by asking the | |
4170 | low target where to place a reinsert breakpoint. Since this | |
4171 | routine assumes the breakpoint being stepped over is a thread event | |
4172 | breakpoint, it usually assumes the return address of the current | |
4173 | function is a good enough place to set the reinsert breakpoint. */ | |
4174 | ||
4175 | static int | |
4176 | start_step_over (struct lwp_info *lwp) | |
4177 | { | |
d86d4aaf | 4178 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4179 | struct thread_info *saved_thread; |
d50171e4 PA |
4180 | CORE_ADDR pc; |
4181 | int step; | |
4182 | ||
4183 | if (debug_threads) | |
87ce2a04 | 4184 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 4185 | lwpid_of (thread)); |
d50171e4 | 4186 | |
7984d532 PA |
4187 | stop_all_lwps (1, lwp); |
4188 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
4189 | |
4190 | if (debug_threads) | |
87ce2a04 | 4191 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
4192 | |
4193 | /* Note, we should always reach here with an already adjusted PC, | |
4194 | either by GDB (if we're resuming due to GDB's request), or by our | |
4195 | caller, if we just finished handling an internal breakpoint GDB | |
4196 | shouldn't care about. */ | |
4197 | pc = get_pc (lwp); | |
4198 | ||
0bfdf32f GB |
4199 | saved_thread = current_thread; |
4200 | current_thread = thread; | |
d50171e4 PA |
4201 | |
4202 | lwp->bp_reinsert = pc; | |
4203 | uninsert_breakpoints_at (pc); | |
fa593d66 | 4204 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
4205 | |
4206 | if (can_hardware_single_step ()) | |
4207 | { | |
4208 | step = 1; | |
4209 | } | |
4210 | else | |
4211 | { | |
4212 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
4213 | set_reinsert_breakpoint (raddr); | |
4214 | step = 0; | |
4215 | } | |
4216 | ||
0bfdf32f | 4217 | current_thread = saved_thread; |
d50171e4 PA |
4218 | |
4219 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
4220 | ||
4221 | /* Require next event from this LWP. */ | |
d86d4aaf | 4222 | step_over_bkpt = thread->entry.id; |
d50171e4 PA |
4223 | return 1; |
4224 | } | |
4225 | ||
4226 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
4227 | start_step_over, if still there, and delete any reinsert | |
4228 | breakpoints we've set, on non hardware single-step targets. */ | |
4229 | ||
4230 | static int | |
4231 | finish_step_over (struct lwp_info *lwp) | |
4232 | { | |
4233 | if (lwp->bp_reinsert != 0) | |
4234 | { | |
4235 | if (debug_threads) | |
87ce2a04 | 4236 | debug_printf ("Finished step over.\n"); |
d50171e4 PA |
4237 | |
4238 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
4239 | may be no breakpoint to reinsert there by now. */ | |
4240 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4241 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4242 | |
4243 | lwp->bp_reinsert = 0; | |
4244 | ||
4245 | /* Delete any software-single-step reinsert breakpoints. No | |
4246 | longer needed. We don't have to worry about other threads | |
4247 | hitting this trap, and later not being able to explain it, | |
4248 | because we were stepping over a breakpoint, and we hold all | |
4249 | threads but LWP stopped while doing that. */ | |
4250 | if (!can_hardware_single_step ()) | |
4251 | delete_reinsert_breakpoints (); | |
4252 | ||
4253 | step_over_bkpt = null_ptid; | |
4254 | return 1; | |
4255 | } | |
4256 | else | |
4257 | return 0; | |
4258 | } | |
4259 | ||
5544ad89 DJ |
4260 | /* This function is called once per thread. We check the thread's resume |
4261 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 4262 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 4263 | |
bd99dc85 PA |
4264 | For threads which we aren't explicitly told otherwise, we preserve |
4265 | the stepping flag; this is used for stepping over gdbserver-placed | |
4266 | breakpoints. | |
4267 | ||
4268 | If pending_flags was set in any thread, we queue any needed | |
4269 | signals, since we won't actually resume. We already have a pending | |
4270 | event to report, so we don't need to preserve any step requests; | |
4271 | they should be re-issued if necessary. */ | |
4272 | ||
4273 | static int | |
4274 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 4275 | { |
d86d4aaf DE |
4276 | struct thread_info *thread = (struct thread_info *) entry; |
4277 | struct lwp_info *lwp = get_thread_lwp (thread); | |
bd99dc85 | 4278 | int step; |
d50171e4 PA |
4279 | int leave_all_stopped = * (int *) arg; |
4280 | int leave_pending; | |
5544ad89 | 4281 | |
2bd7c093 | 4282 | if (lwp->resume == NULL) |
bd99dc85 | 4283 | return 0; |
5544ad89 | 4284 | |
bd99dc85 | 4285 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 4286 | { |
bd99dc85 | 4287 | if (debug_threads) |
d86d4aaf | 4288 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
4289 | |
4290 | if (!lwp->stopped) | |
4291 | { | |
4292 | if (debug_threads) | |
d86d4aaf | 4293 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 4294 | |
d50171e4 PA |
4295 | /* Stop the thread, and wait for the event asynchronously, |
4296 | through the event loop. */ | |
02fc4de7 | 4297 | send_sigstop (lwp); |
bd99dc85 PA |
4298 | } |
4299 | else | |
4300 | { | |
4301 | if (debug_threads) | |
87ce2a04 | 4302 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 4303 | lwpid_of (thread)); |
d50171e4 PA |
4304 | |
4305 | /* The LWP may have been stopped in an internal event that | |
4306 | was not meant to be notified back to GDB (e.g., gdbserver | |
4307 | breakpoint), so we should be reporting a stop event in | |
4308 | this case too. */ | |
4309 | ||
4310 | /* If the thread already has a pending SIGSTOP, this is a | |
4311 | no-op. Otherwise, something later will presumably resume | |
4312 | the thread and this will cause it to cancel any pending | |
4313 | operation, due to last_resume_kind == resume_stop. If | |
4314 | the thread already has a pending status to report, we | |
4315 | will still report it the next time we wait - see | |
4316 | status_pending_p_callback. */ | |
1a981360 PA |
4317 | |
4318 | /* If we already have a pending signal to report, then | |
4319 | there's no need to queue a SIGSTOP, as this means we're | |
4320 | midway through moving the LWP out of the jumppad, and we | |
4321 | will report the pending signal as soon as that is | |
4322 | finished. */ | |
4323 | if (lwp->pending_signals_to_report == NULL) | |
4324 | send_sigstop (lwp); | |
bd99dc85 | 4325 | } |
32ca6d61 | 4326 | |
bd99dc85 PA |
4327 | /* For stop requests, we're done. */ |
4328 | lwp->resume = NULL; | |
fc7238bb | 4329 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4330 | return 0; |
5544ad89 DJ |
4331 | } |
4332 | ||
bd99dc85 PA |
4333 | /* If this thread which is about to be resumed has a pending status, |
4334 | then don't resume any threads - we can just report the pending | |
4335 | status. Make sure to queue any signals that would otherwise be | |
4336 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
4337 | thread has a pending status. If there's a thread that needs the |
4338 | step-over-breakpoint dance, then don't resume any other thread | |
4339 | but that particular one. */ | |
4340 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 4341 | |
d50171e4 | 4342 | if (!leave_pending) |
bd99dc85 PA |
4343 | { |
4344 | if (debug_threads) | |
d86d4aaf | 4345 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 4346 | |
d50171e4 | 4347 | step = (lwp->resume->kind == resume_step); |
2acc282a | 4348 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
4349 | } |
4350 | else | |
4351 | { | |
4352 | if (debug_threads) | |
d86d4aaf | 4353 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
5544ad89 | 4354 | |
bd99dc85 PA |
4355 | /* If we have a new signal, enqueue the signal. */ |
4356 | if (lwp->resume->sig != 0) | |
4357 | { | |
4358 | struct pending_signals *p_sig; | |
4359 | p_sig = xmalloc (sizeof (*p_sig)); | |
4360 | p_sig->prev = lwp->pending_signals; | |
4361 | p_sig->signal = lwp->resume->sig; | |
4362 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
4363 | ||
4364 | /* If this is the same signal we were previously stopped by, | |
4365 | make sure to queue its siginfo. We can ignore the return | |
4366 | value of ptrace; if it fails, we'll skip | |
4367 | PTRACE_SETSIGINFO. */ | |
4368 | if (WIFSTOPPED (lwp->last_status) | |
4369 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
d86d4aaf | 4370 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4371 | &p_sig->info); |
bd99dc85 PA |
4372 | |
4373 | lwp->pending_signals = p_sig; | |
4374 | } | |
4375 | } | |
5544ad89 | 4376 | |
fc7238bb | 4377 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4378 | lwp->resume = NULL; |
5544ad89 | 4379 | return 0; |
0d62e5e8 DJ |
4380 | } |
4381 | ||
4382 | static void | |
2bd7c093 | 4383 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 4384 | { |
2bd7c093 | 4385 | struct thread_resume_array array = { resume_info, n }; |
d86d4aaf | 4386 | struct thread_info *need_step_over = NULL; |
d50171e4 PA |
4387 | int any_pending; |
4388 | int leave_all_stopped; | |
c6ecbae5 | 4389 | |
87ce2a04 DE |
4390 | if (debug_threads) |
4391 | { | |
4392 | debug_enter (); | |
4393 | debug_printf ("linux_resume:\n"); | |
4394 | } | |
4395 | ||
2bd7c093 | 4396 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 4397 | |
d50171e4 PA |
4398 | /* If there is a thread which would otherwise be resumed, which has |
4399 | a pending status, then don't resume any threads - we can just | |
4400 | report the pending status. Make sure to queue any signals that | |
4401 | would otherwise be sent. In non-stop mode, we'll apply this | |
4402 | logic to each thread individually. We consume all pending events | |
4403 | before considering to start a step-over (in all-stop). */ | |
4404 | any_pending = 0; | |
bd99dc85 | 4405 | if (!non_stop) |
d86d4aaf | 4406 | find_inferior (&all_threads, resume_status_pending_p, &any_pending); |
d50171e4 PA |
4407 | |
4408 | /* If there is a thread which would otherwise be resumed, which is | |
4409 | stopped at a breakpoint that needs stepping over, then don't | |
4410 | resume any threads - have it step over the breakpoint with all | |
4411 | other threads stopped, then resume all threads again. Make sure | |
4412 | to queue any signals that would otherwise be delivered or | |
4413 | queued. */ | |
4414 | if (!any_pending && supports_breakpoints ()) | |
4415 | need_step_over | |
d86d4aaf DE |
4416 | = (struct thread_info *) find_inferior (&all_threads, |
4417 | need_step_over_p, NULL); | |
d50171e4 PA |
4418 | |
4419 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
4420 | ||
4421 | if (debug_threads) | |
4422 | { | |
4423 | if (need_step_over != NULL) | |
87ce2a04 | 4424 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 4425 | else if (any_pending) |
87ce2a04 DE |
4426 | debug_printf ("Not resuming, all-stop and found " |
4427 | "an LWP with pending status\n"); | |
d50171e4 | 4428 | else |
87ce2a04 | 4429 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4430 | } |
4431 | ||
4432 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4433 | otherwise deliver. */ | |
4434 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
4435 | ||
4436 | if (need_step_over) | |
d86d4aaf | 4437 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4438 | |
4439 | if (debug_threads) | |
4440 | { | |
4441 | debug_printf ("linux_resume done\n"); | |
4442 | debug_exit (); | |
4443 | } | |
d50171e4 PA |
4444 | } |
4445 | ||
4446 | /* This function is called once per thread. We check the thread's | |
4447 | last resume request, which will tell us whether to resume, step, or | |
4448 | leave the thread stopped. Any signal the client requested to be | |
4449 | delivered has already been enqueued at this point. | |
4450 | ||
4451 | If any thread that GDB wants running is stopped at an internal | |
4452 | breakpoint that needs stepping over, we start a step-over operation | |
4453 | on that particular thread, and leave all others stopped. */ | |
4454 | ||
7984d532 PA |
4455 | static int |
4456 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 4457 | { |
d86d4aaf DE |
4458 | struct thread_info *thread = (struct thread_info *) entry; |
4459 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
4460 | int step; |
4461 | ||
7984d532 PA |
4462 | if (lwp == except) |
4463 | return 0; | |
d50171e4 PA |
4464 | |
4465 | if (debug_threads) | |
d86d4aaf | 4466 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4467 | |
4468 | if (!lwp->stopped) | |
4469 | { | |
4470 | if (debug_threads) | |
d86d4aaf | 4471 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
7984d532 | 4472 | return 0; |
d50171e4 PA |
4473 | } |
4474 | ||
02fc4de7 PA |
4475 | if (thread->last_resume_kind == resume_stop |
4476 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4477 | { |
4478 | if (debug_threads) | |
87ce2a04 | 4479 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4480 | lwpid_of (thread)); |
7984d532 | 4481 | return 0; |
d50171e4 PA |
4482 | } |
4483 | ||
4484 | if (lwp->status_pending_p) | |
4485 | { | |
4486 | if (debug_threads) | |
87ce2a04 | 4487 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4488 | lwpid_of (thread)); |
7984d532 | 4489 | return 0; |
d50171e4 PA |
4490 | } |
4491 | ||
7984d532 PA |
4492 | gdb_assert (lwp->suspended >= 0); |
4493 | ||
d50171e4 PA |
4494 | if (lwp->suspended) |
4495 | { | |
4496 | if (debug_threads) | |
d86d4aaf | 4497 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
7984d532 | 4498 | return 0; |
d50171e4 PA |
4499 | } |
4500 | ||
1a981360 PA |
4501 | if (thread->last_resume_kind == resume_stop |
4502 | && lwp->pending_signals_to_report == NULL | |
4503 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
4504 | { |
4505 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4506 | last_status.kind check above would catch it, and we wouldn't | |
4507 | reach here. This LWP may have been momentarily paused by a | |
4508 | stop_all_lwps call while handling for example, another LWP's | |
4509 | step-over. In that case, the pending expected SIGSTOP signal | |
4510 | that was queued at vCont;t handling time will have already | |
4511 | been consumed by wait_for_sigstop, and so we need to requeue | |
4512 | another one here. Note that if the LWP already has a SIGSTOP | |
4513 | pending, this is a no-op. */ | |
4514 | ||
4515 | if (debug_threads) | |
87ce2a04 DE |
4516 | debug_printf ("Client wants LWP %ld to stop. " |
4517 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 4518 | lwpid_of (thread)); |
02fc4de7 PA |
4519 | |
4520 | send_sigstop (lwp); | |
4521 | } | |
4522 | ||
8336d594 | 4523 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 4524 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
4525 | return 0; |
4526 | } | |
4527 | ||
4528 | static int | |
4529 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
4530 | { | |
d86d4aaf DE |
4531 | struct thread_info *thread = (struct thread_info *) entry; |
4532 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
4533 | |
4534 | if (lwp == except) | |
4535 | return 0; | |
4536 | ||
4537 | lwp->suspended--; | |
4538 | gdb_assert (lwp->suspended >= 0); | |
4539 | ||
4540 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
4541 | } |
4542 | ||
4543 | /* When we finish a step-over, set threads running again. If there's | |
4544 | another thread that may need a step-over, now's the time to start | |
4545 | it. Eventually, we'll move all threads past their breakpoints. */ | |
4546 | ||
4547 | static void | |
4548 | proceed_all_lwps (void) | |
4549 | { | |
d86d4aaf | 4550 | struct thread_info *need_step_over; |
d50171e4 PA |
4551 | |
4552 | /* If there is a thread which would otherwise be resumed, which is | |
4553 | stopped at a breakpoint that needs stepping over, then don't | |
4554 | resume any threads - have it step over the breakpoint with all | |
4555 | other threads stopped, then resume all threads again. */ | |
4556 | ||
4557 | if (supports_breakpoints ()) | |
4558 | { | |
4559 | need_step_over | |
d86d4aaf DE |
4560 | = (struct thread_info *) find_inferior (&all_threads, |
4561 | need_step_over_p, NULL); | |
d50171e4 PA |
4562 | |
4563 | if (need_step_over != NULL) | |
4564 | { | |
4565 | if (debug_threads) | |
87ce2a04 DE |
4566 | debug_printf ("proceed_all_lwps: found " |
4567 | "thread %ld needing a step-over\n", | |
4568 | lwpid_of (need_step_over)); | |
d50171e4 | 4569 | |
d86d4aaf | 4570 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
4571 | return; |
4572 | } | |
4573 | } | |
5544ad89 | 4574 | |
d50171e4 | 4575 | if (debug_threads) |
87ce2a04 | 4576 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 4577 | |
d86d4aaf | 4578 | find_inferior (&all_threads, proceed_one_lwp, NULL); |
d50171e4 PA |
4579 | } |
4580 | ||
4581 | /* Stopped LWPs that the client wanted to be running, that don't have | |
4582 | pending statuses, are set to run again, except for EXCEPT, if not | |
4583 | NULL. This undoes a stop_all_lwps call. */ | |
4584 | ||
4585 | static void | |
7984d532 | 4586 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 4587 | { |
5544ad89 DJ |
4588 | if (debug_threads) |
4589 | { | |
87ce2a04 | 4590 | debug_enter (); |
d50171e4 | 4591 | if (except) |
87ce2a04 | 4592 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 4593 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 4594 | else |
87ce2a04 | 4595 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
4596 | } |
4597 | ||
7984d532 | 4598 | if (unsuspend) |
d86d4aaf | 4599 | find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except); |
7984d532 | 4600 | else |
d86d4aaf | 4601 | find_inferior (&all_threads, proceed_one_lwp, except); |
87ce2a04 DE |
4602 | |
4603 | if (debug_threads) | |
4604 | { | |
4605 | debug_printf ("unstop_all_lwps done\n"); | |
4606 | debug_exit (); | |
4607 | } | |
0d62e5e8 DJ |
4608 | } |
4609 | ||
58caa3dc DJ |
4610 | |
4611 | #ifdef HAVE_LINUX_REGSETS | |
4612 | ||
1faeff08 MR |
4613 | #define use_linux_regsets 1 |
4614 | ||
030031ee PA |
4615 | /* Returns true if REGSET has been disabled. */ |
4616 | ||
4617 | static int | |
4618 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
4619 | { | |
4620 | return (info->disabled_regsets != NULL | |
4621 | && info->disabled_regsets[regset - info->regsets]); | |
4622 | } | |
4623 | ||
4624 | /* Disable REGSET. */ | |
4625 | ||
4626 | static void | |
4627 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
4628 | { | |
4629 | int dr_offset; | |
4630 | ||
4631 | dr_offset = regset - info->regsets; | |
4632 | if (info->disabled_regsets == NULL) | |
4633 | info->disabled_regsets = xcalloc (1, info->num_regsets); | |
4634 | info->disabled_regsets[dr_offset] = 1; | |
4635 | } | |
4636 | ||
58caa3dc | 4637 | static int |
3aee8918 PA |
4638 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
4639 | struct regcache *regcache) | |
58caa3dc DJ |
4640 | { |
4641 | struct regset_info *regset; | |
e9d25b98 | 4642 | int saw_general_regs = 0; |
95954743 | 4643 | int pid; |
1570b33e | 4644 | struct iovec iov; |
58caa3dc | 4645 | |
0bfdf32f | 4646 | pid = lwpid_of (current_thread); |
28eef672 | 4647 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4648 | { |
1570b33e L |
4649 | void *buf, *data; |
4650 | int nt_type, res; | |
58caa3dc | 4651 | |
030031ee | 4652 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 4653 | continue; |
58caa3dc | 4654 | |
bca929d3 | 4655 | buf = xmalloc (regset->size); |
1570b33e L |
4656 | |
4657 | nt_type = regset->nt_type; | |
4658 | if (nt_type) | |
4659 | { | |
4660 | iov.iov_base = buf; | |
4661 | iov.iov_len = regset->size; | |
4662 | data = (void *) &iov; | |
4663 | } | |
4664 | else | |
4665 | data = buf; | |
4666 | ||
dfb64f85 | 4667 | #ifndef __sparc__ |
f15f9948 | 4668 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4669 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4670 | #else |
1570b33e | 4671 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4672 | #endif |
58caa3dc DJ |
4673 | if (res < 0) |
4674 | { | |
4675 | if (errno == EIO) | |
4676 | { | |
52fa2412 | 4677 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4678 | this process mode. */ |
030031ee | 4679 | disable_regset (regsets_info, regset); |
58caa3dc | 4680 | } |
e5a9158d AA |
4681 | else if (errno == ENODATA) |
4682 | { | |
4683 | /* ENODATA may be returned if the regset is currently | |
4684 | not "active". This can happen in normal operation, | |
4685 | so suppress the warning in this case. */ | |
4686 | } | |
58caa3dc DJ |
4687 | else |
4688 | { | |
0d62e5e8 | 4689 | char s[256]; |
95954743 PA |
4690 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4691 | pid); | |
0d62e5e8 | 4692 | perror (s); |
58caa3dc DJ |
4693 | } |
4694 | } | |
098dbe61 AA |
4695 | else |
4696 | { | |
4697 | if (regset->type == GENERAL_REGS) | |
4698 | saw_general_regs = 1; | |
4699 | regset->store_function (regcache, buf); | |
4700 | } | |
fdeb2a12 | 4701 | free (buf); |
58caa3dc | 4702 | } |
e9d25b98 DJ |
4703 | if (saw_general_regs) |
4704 | return 0; | |
4705 | else | |
4706 | return 1; | |
58caa3dc DJ |
4707 | } |
4708 | ||
4709 | static int | |
3aee8918 PA |
4710 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
4711 | struct regcache *regcache) | |
58caa3dc DJ |
4712 | { |
4713 | struct regset_info *regset; | |
e9d25b98 | 4714 | int saw_general_regs = 0; |
95954743 | 4715 | int pid; |
1570b33e | 4716 | struct iovec iov; |
58caa3dc | 4717 | |
0bfdf32f | 4718 | pid = lwpid_of (current_thread); |
28eef672 | 4719 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4720 | { |
1570b33e L |
4721 | void *buf, *data; |
4722 | int nt_type, res; | |
58caa3dc | 4723 | |
feea5f36 AA |
4724 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
4725 | || regset->fill_function == NULL) | |
28eef672 | 4726 | continue; |
58caa3dc | 4727 | |
bca929d3 | 4728 | buf = xmalloc (regset->size); |
545587ee DJ |
4729 | |
4730 | /* First fill the buffer with the current register set contents, | |
4731 | in case there are any items in the kernel's regset that are | |
4732 | not in gdbserver's regcache. */ | |
1570b33e L |
4733 | |
4734 | nt_type = regset->nt_type; | |
4735 | if (nt_type) | |
4736 | { | |
4737 | iov.iov_base = buf; | |
4738 | iov.iov_len = regset->size; | |
4739 | data = (void *) &iov; | |
4740 | } | |
4741 | else | |
4742 | data = buf; | |
4743 | ||
dfb64f85 | 4744 | #ifndef __sparc__ |
f15f9948 | 4745 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4746 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4747 | #else |
689cc2ae | 4748 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4749 | #endif |
545587ee DJ |
4750 | |
4751 | if (res == 0) | |
4752 | { | |
4753 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4754 | regset->fill_function (regcache, buf); |
545587ee DJ |
4755 | |
4756 | /* Only now do we write the register set. */ | |
dfb64f85 | 4757 | #ifndef __sparc__ |
f15f9948 | 4758 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 4759 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4760 | #else |
1570b33e | 4761 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4762 | #endif |
545587ee DJ |
4763 | } |
4764 | ||
58caa3dc DJ |
4765 | if (res < 0) |
4766 | { | |
4767 | if (errno == EIO) | |
4768 | { | |
52fa2412 | 4769 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4770 | this process mode. */ |
030031ee | 4771 | disable_regset (regsets_info, regset); |
58caa3dc | 4772 | } |
3221518c UW |
4773 | else if (errno == ESRCH) |
4774 | { | |
1b3f6016 PA |
4775 | /* At this point, ESRCH should mean the process is |
4776 | already gone, in which case we simply ignore attempts | |
4777 | to change its registers. See also the related | |
4778 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4779 | free (buf); |
3221518c UW |
4780 | return 0; |
4781 | } | |
58caa3dc DJ |
4782 | else |
4783 | { | |
ce3a066d | 4784 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4785 | } |
4786 | } | |
e9d25b98 DJ |
4787 | else if (regset->type == GENERAL_REGS) |
4788 | saw_general_regs = 1; | |
09ec9b38 | 4789 | free (buf); |
58caa3dc | 4790 | } |
e9d25b98 DJ |
4791 | if (saw_general_regs) |
4792 | return 0; | |
4793 | else | |
4794 | return 1; | |
58caa3dc DJ |
4795 | } |
4796 | ||
1faeff08 | 4797 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4798 | |
1faeff08 | 4799 | #define use_linux_regsets 0 |
3aee8918 PA |
4800 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
4801 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 4802 | |
58caa3dc | 4803 | #endif |
1faeff08 MR |
4804 | |
4805 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4806 | calls or 0 if it has to be transferred individually. */ | |
4807 | ||
4808 | static int | |
3aee8918 | 4809 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
4810 | { |
4811 | unsigned char mask = 1 << (regno % 8); | |
4812 | size_t index = regno / 8; | |
4813 | ||
4814 | return (use_linux_regsets | |
3aee8918 PA |
4815 | && (regs_info->regset_bitmap == NULL |
4816 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
4817 | } |
4818 | ||
58caa3dc | 4819 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4820 | |
4821 | int | |
3aee8918 | 4822 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
4823 | { |
4824 | int addr; | |
4825 | ||
3aee8918 | 4826 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
4827 | error ("Invalid register number %d.", regnum); |
4828 | ||
3aee8918 | 4829 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
4830 | |
4831 | return addr; | |
4832 | } | |
4833 | ||
4834 | /* Fetch one register. */ | |
4835 | static void | |
3aee8918 PA |
4836 | fetch_register (const struct usrregs_info *usrregs, |
4837 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4838 | { |
4839 | CORE_ADDR regaddr; | |
4840 | int i, size; | |
4841 | char *buf; | |
4842 | int pid; | |
4843 | ||
3aee8918 | 4844 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4845 | return; |
4846 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4847 | return; | |
4848 | ||
3aee8918 | 4849 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4850 | if (regaddr == -1) |
4851 | return; | |
4852 | ||
3aee8918 PA |
4853 | size = ((register_size (regcache->tdesc, regno) |
4854 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4855 | & -sizeof (PTRACE_XFER_TYPE)); |
4856 | buf = alloca (size); | |
4857 | ||
0bfdf32f | 4858 | pid = lwpid_of (current_thread); |
1faeff08 MR |
4859 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4860 | { | |
4861 | errno = 0; | |
4862 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4863 | ptrace (PTRACE_PEEKUSER, pid, | |
4864 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4865 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4866 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
4867 | regaddr += sizeof (PTRACE_XFER_TYPE); |
4868 | if (errno != 0) | |
4869 | error ("reading register %d: %s", regno, strerror (errno)); | |
4870 | } | |
4871 | ||
4872 | if (the_low_target.supply_ptrace_register) | |
4873 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4874 | else | |
4875 | supply_register (regcache, regno, buf); | |
4876 | } | |
4877 | ||
4878 | /* Store one register. */ | |
4879 | static void | |
3aee8918 PA |
4880 | store_register (const struct usrregs_info *usrregs, |
4881 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4882 | { |
4883 | CORE_ADDR regaddr; | |
4884 | int i, size; | |
4885 | char *buf; | |
4886 | int pid; | |
4887 | ||
3aee8918 | 4888 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4889 | return; |
4890 | if ((*the_low_target.cannot_store_register) (regno)) | |
4891 | return; | |
4892 | ||
3aee8918 | 4893 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4894 | if (regaddr == -1) |
4895 | return; | |
4896 | ||
3aee8918 PA |
4897 | size = ((register_size (regcache->tdesc, regno) |
4898 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4899 | & -sizeof (PTRACE_XFER_TYPE)); |
4900 | buf = alloca (size); | |
4901 | memset (buf, 0, size); | |
4902 | ||
4903 | if (the_low_target.collect_ptrace_register) | |
4904 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4905 | else | |
4906 | collect_register (regcache, regno, buf); | |
4907 | ||
0bfdf32f | 4908 | pid = lwpid_of (current_thread); |
1faeff08 MR |
4909 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4910 | { | |
4911 | errno = 0; | |
4912 | ptrace (PTRACE_POKEUSER, pid, | |
4913 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4914 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4915 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
4916 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
4917 | if (errno != 0) |
4918 | { | |
4919 | /* At this point, ESRCH should mean the process is | |
4920 | already gone, in which case we simply ignore attempts | |
4921 | to change its registers. See also the related | |
4922 | comment in linux_resume_one_lwp. */ | |
4923 | if (errno == ESRCH) | |
4924 | return; | |
4925 | ||
4926 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4927 | error ("writing register %d: %s", regno, strerror (errno)); | |
4928 | } | |
4929 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4930 | } | |
4931 | } | |
4932 | ||
4933 | /* Fetch all registers, or just one, from the child process. | |
4934 | If REGNO is -1, do this for all registers, skipping any that are | |
4935 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4936 | unless ALL is non-zero. | |
4937 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4938 | static void | |
3aee8918 PA |
4939 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
4940 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4941 | { |
3aee8918 PA |
4942 | struct usrregs_info *usr = regs_info->usrregs; |
4943 | ||
1faeff08 MR |
4944 | if (regno == -1) |
4945 | { | |
3aee8918 PA |
4946 | for (regno = 0; regno < usr->num_regs; regno++) |
4947 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4948 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
4949 | } |
4950 | else | |
3aee8918 | 4951 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
4952 | } |
4953 | ||
4954 | /* Store our register values back into the inferior. | |
4955 | If REGNO is -1, do this for all registers, skipping any that are | |
4956 | assumed to have been saved by regsets_store_inferior_registers, | |
4957 | unless ALL is non-zero. | |
4958 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4959 | static void | |
3aee8918 PA |
4960 | usr_store_inferior_registers (const struct regs_info *regs_info, |
4961 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4962 | { |
3aee8918 PA |
4963 | struct usrregs_info *usr = regs_info->usrregs; |
4964 | ||
1faeff08 MR |
4965 | if (regno == -1) |
4966 | { | |
3aee8918 PA |
4967 | for (regno = 0; regno < usr->num_regs; regno++) |
4968 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4969 | store_register (usr, regcache, regno); | |
1faeff08 MR |
4970 | } |
4971 | else | |
3aee8918 | 4972 | store_register (usr, regcache, regno); |
1faeff08 MR |
4973 | } |
4974 | ||
4975 | #else /* !HAVE_LINUX_USRREGS */ | |
4976 | ||
3aee8918 PA |
4977 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
4978 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 4979 | |
58caa3dc | 4980 | #endif |
1faeff08 MR |
4981 | |
4982 | ||
4983 | void | |
4984 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4985 | { | |
4986 | int use_regsets; | |
4987 | int all = 0; | |
3aee8918 | 4988 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4989 | |
4990 | if (regno == -1) | |
4991 | { | |
3aee8918 PA |
4992 | if (the_low_target.fetch_register != NULL |
4993 | && regs_info->usrregs != NULL) | |
4994 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
4995 | (*the_low_target.fetch_register) (regcache, regno); |
4996 | ||
3aee8918 PA |
4997 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
4998 | if (regs_info->usrregs != NULL) | |
4999 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5000 | } |
5001 | else | |
5002 | { | |
c14dfd32 PA |
5003 | if (the_low_target.fetch_register != NULL |
5004 | && (*the_low_target.fetch_register) (regcache, regno)) | |
5005 | return; | |
5006 | ||
3aee8918 | 5007 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5008 | if (use_regsets) |
3aee8918 PA |
5009 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5010 | regcache); | |
5011 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5012 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5013 | } |
58caa3dc DJ |
5014 | } |
5015 | ||
5016 | void | |
442ea881 | 5017 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 5018 | { |
1faeff08 MR |
5019 | int use_regsets; |
5020 | int all = 0; | |
3aee8918 | 5021 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5022 | |
5023 | if (regno == -1) | |
5024 | { | |
3aee8918 PA |
5025 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5026 | regcache); | |
5027 | if (regs_info->usrregs != NULL) | |
5028 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5029 | } |
5030 | else | |
5031 | { | |
3aee8918 | 5032 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5033 | if (use_regsets) |
3aee8918 PA |
5034 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5035 | regcache); | |
5036 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5037 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5038 | } |
58caa3dc DJ |
5039 | } |
5040 | ||
da6d8c04 | 5041 | |
da6d8c04 DJ |
5042 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
5043 | to debugger memory starting at MYADDR. */ | |
5044 | ||
c3e735a6 | 5045 | static int |
f450004a | 5046 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 5047 | { |
0bfdf32f | 5048 | int pid = lwpid_of (current_thread); |
4934b29e MR |
5049 | register PTRACE_XFER_TYPE *buffer; |
5050 | register CORE_ADDR addr; | |
5051 | register int count; | |
5052 | char filename[64]; | |
da6d8c04 | 5053 | register int i; |
4934b29e | 5054 | int ret; |
fd462a61 | 5055 | int fd; |
fd462a61 DJ |
5056 | |
5057 | /* Try using /proc. Don't bother for one word. */ | |
5058 | if (len >= 3 * sizeof (long)) | |
5059 | { | |
4934b29e MR |
5060 | int bytes; |
5061 | ||
fd462a61 DJ |
5062 | /* We could keep this file open and cache it - possibly one per |
5063 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5064 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5065 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5066 | if (fd == -1) | |
5067 | goto no_proc; | |
5068 | ||
5069 | /* If pread64 is available, use it. It's faster if the kernel | |
5070 | supports it (only one syscall), and it's 64-bit safe even on | |
5071 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5072 | application). */ | |
5073 | #ifdef HAVE_PREAD64 | |
4934b29e | 5074 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5075 | #else |
4934b29e MR |
5076 | bytes = -1; |
5077 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5078 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5079 | #endif |
fd462a61 DJ |
5080 | |
5081 | close (fd); | |
4934b29e MR |
5082 | if (bytes == len) |
5083 | return 0; | |
5084 | ||
5085 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5086 | if (bytes > 0) | |
5087 | { | |
5088 | memaddr += bytes; | |
5089 | myaddr += bytes; | |
5090 | len -= bytes; | |
5091 | } | |
fd462a61 | 5092 | } |
da6d8c04 | 5093 | |
fd462a61 | 5094 | no_proc: |
4934b29e MR |
5095 | /* Round starting address down to longword boundary. */ |
5096 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5097 | /* Round ending address up; get number of longwords that makes. */ | |
5098 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5099 | / sizeof (PTRACE_XFER_TYPE)); | |
5100 | /* Allocate buffer of that many longwords. */ | |
5101 | buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
5102 | ||
da6d8c04 | 5103 | /* Read all the longwords */ |
4934b29e | 5104 | errno = 0; |
da6d8c04 DJ |
5105 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5106 | { | |
14ce3065 DE |
5107 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5108 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5109 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5110 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5111 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5112 | if (errno) |
4934b29e | 5113 | break; |
da6d8c04 | 5114 | } |
4934b29e | 5115 | ret = errno; |
da6d8c04 DJ |
5116 | |
5117 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5118 | if (i > 0) |
5119 | { | |
5120 | i *= sizeof (PTRACE_XFER_TYPE); | |
5121 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5122 | memcpy (myaddr, | |
5123 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5124 | i < len ? i : len); | |
5125 | } | |
c3e735a6 | 5126 | |
4934b29e | 5127 | return ret; |
da6d8c04 DJ |
5128 | } |
5129 | ||
93ae6fdc PA |
5130 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5131 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5132 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5133 | |
ce3a066d | 5134 | static int |
f450004a | 5135 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
5136 | { |
5137 | register int i; | |
5138 | /* Round starting address down to longword boundary. */ | |
5139 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5140 | /* Round ending address up; get number of longwords that makes. */ | |
5141 | register int count | |
493e2a69 MS |
5142 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5143 | / sizeof (PTRACE_XFER_TYPE); | |
5144 | ||
da6d8c04 | 5145 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
5146 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
5147 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
5148 | ||
0bfdf32f | 5149 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5150 | |
f0ae6fc3 PA |
5151 | if (len == 0) |
5152 | { | |
5153 | /* Zero length write always succeeds. */ | |
5154 | return 0; | |
5155 | } | |
5156 | ||
0d62e5e8 DJ |
5157 | if (debug_threads) |
5158 | { | |
58d6951d DJ |
5159 | /* Dump up to four bytes. */ |
5160 | unsigned int val = * (unsigned int *) myaddr; | |
5161 | if (len == 1) | |
5162 | val = val & 0xff; | |
5163 | else if (len == 2) | |
5164 | val = val & 0xffff; | |
5165 | else if (len == 3) | |
5166 | val = val & 0xffffff; | |
de0d863e DB |
5167 | debug_printf ("Writing %0*x to 0x%08lx in process %d\n", |
5168 | 2 * ((len < 4) ? len : 4), val, (long)memaddr, pid); | |
0d62e5e8 DJ |
5169 | } |
5170 | ||
da6d8c04 DJ |
5171 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
5172 | ||
93ae6fdc | 5173 | errno = 0; |
14ce3065 DE |
5174 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5175 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5176 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5177 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5178 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
5179 | if (errno) |
5180 | return errno; | |
da6d8c04 DJ |
5181 | |
5182 | if (count > 1) | |
5183 | { | |
93ae6fdc | 5184 | errno = 0; |
da6d8c04 | 5185 | buffer[count - 1] |
95954743 | 5186 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
5187 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
5188 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5189 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 5190 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 5191 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
5192 | if (errno) |
5193 | return errno; | |
da6d8c04 DJ |
5194 | } |
5195 | ||
93ae6fdc | 5196 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 5197 | |
493e2a69 MS |
5198 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
5199 | myaddr, len); | |
da6d8c04 DJ |
5200 | |
5201 | /* Write the entire buffer. */ | |
5202 | ||
5203 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
5204 | { | |
5205 | errno = 0; | |
14ce3065 DE |
5206 | ptrace (PTRACE_POKETEXT, pid, |
5207 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5208 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5209 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5210 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
5211 | if (errno) |
5212 | return errno; | |
5213 | } | |
5214 | ||
5215 | return 0; | |
5216 | } | |
2f2893d9 DJ |
5217 | |
5218 | static void | |
5219 | linux_look_up_symbols (void) | |
5220 | { | |
0d62e5e8 | 5221 | #ifdef USE_THREAD_DB |
95954743 PA |
5222 | struct process_info *proc = current_process (); |
5223 | ||
fe978cb0 | 5224 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
5225 | return; |
5226 | ||
96d7229d LM |
5227 | /* If the kernel supports tracing clones, then we don't need to |
5228 | use the magic thread event breakpoint to learn about | |
5229 | threads. */ | |
5230 | thread_db_init (!linux_supports_traceclone ()); | |
0d62e5e8 DJ |
5231 | #endif |
5232 | } | |
5233 | ||
e5379b03 | 5234 | static void |
ef57601b | 5235 | linux_request_interrupt (void) |
e5379b03 | 5236 | { |
a1928bad | 5237 | extern unsigned long signal_pid; |
e5379b03 | 5238 | |
78708b7c PA |
5239 | /* Send a SIGINT to the process group. This acts just like the user |
5240 | typed a ^C on the controlling terminal. */ | |
5241 | kill (-signal_pid, SIGINT); | |
e5379b03 DJ |
5242 | } |
5243 | ||
aa691b87 RM |
5244 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
5245 | to debugger memory starting at MYADDR. */ | |
5246 | ||
5247 | static int | |
f450004a | 5248 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
5249 | { |
5250 | char filename[PATH_MAX]; | |
5251 | int fd, n; | |
0bfdf32f | 5252 | int pid = lwpid_of (current_thread); |
aa691b87 | 5253 | |
6cebaf6e | 5254 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
5255 | |
5256 | fd = open (filename, O_RDONLY); | |
5257 | if (fd < 0) | |
5258 | return -1; | |
5259 | ||
5260 | if (offset != (CORE_ADDR) 0 | |
5261 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5262 | n = -1; | |
5263 | else | |
5264 | n = read (fd, myaddr, len); | |
5265 | ||
5266 | close (fd); | |
5267 | ||
5268 | return n; | |
5269 | } | |
5270 | ||
d993e290 PA |
5271 | /* These breakpoint and watchpoint related wrapper functions simply |
5272 | pass on the function call if the target has registered a | |
5273 | corresponding function. */ | |
e013ee27 OF |
5274 | |
5275 | static int | |
802e8e6d PA |
5276 | linux_supports_z_point_type (char z_type) |
5277 | { | |
5278 | return (the_low_target.supports_z_point_type != NULL | |
5279 | && the_low_target.supports_z_point_type (z_type)); | |
5280 | } | |
5281 | ||
5282 | static int | |
5283 | linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5284 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5285 | { |
c8f4bfdd YQ |
5286 | if (type == raw_bkpt_type_sw) |
5287 | return insert_memory_breakpoint (bp); | |
5288 | else if (the_low_target.insert_point != NULL) | |
802e8e6d | 5289 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
5290 | else |
5291 | /* Unsupported (see target.h). */ | |
5292 | return 1; | |
5293 | } | |
5294 | ||
5295 | static int | |
802e8e6d PA |
5296 | linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
5297 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5298 | { |
c8f4bfdd YQ |
5299 | if (type == raw_bkpt_type_sw) |
5300 | return remove_memory_breakpoint (bp); | |
5301 | else if (the_low_target.remove_point != NULL) | |
802e8e6d | 5302 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
5303 | else |
5304 | /* Unsupported (see target.h). */ | |
5305 | return 1; | |
5306 | } | |
5307 | ||
3e572f71 PA |
5308 | /* Implement the to_stopped_by_sw_breakpoint target_ops |
5309 | method. */ | |
5310 | ||
5311 | static int | |
5312 | linux_stopped_by_sw_breakpoint (void) | |
5313 | { | |
5314 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5315 | ||
5316 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
5317 | } | |
5318 | ||
5319 | /* Implement the to_supports_stopped_by_sw_breakpoint target_ops | |
5320 | method. */ | |
5321 | ||
5322 | static int | |
5323 | linux_supports_stopped_by_sw_breakpoint (void) | |
5324 | { | |
5325 | return USE_SIGTRAP_SIGINFO; | |
5326 | } | |
5327 | ||
5328 | /* Implement the to_stopped_by_hw_breakpoint target_ops | |
5329 | method. */ | |
5330 | ||
5331 | static int | |
5332 | linux_stopped_by_hw_breakpoint (void) | |
5333 | { | |
5334 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5335 | ||
5336 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
5337 | } | |
5338 | ||
5339 | /* Implement the to_supports_stopped_by_hw_breakpoint target_ops | |
5340 | method. */ | |
5341 | ||
5342 | static int | |
5343 | linux_supports_stopped_by_hw_breakpoint (void) | |
5344 | { | |
5345 | return USE_SIGTRAP_SIGINFO; | |
5346 | } | |
5347 | ||
45614f15 YQ |
5348 | /* Implement the supports_conditional_breakpoints target_ops |
5349 | method. */ | |
5350 | ||
5351 | static int | |
5352 | linux_supports_conditional_breakpoints (void) | |
5353 | { | |
5354 | /* GDBserver needs to step over the breakpoint if the condition is | |
5355 | false. GDBserver software single step is too simple, so disable | |
5356 | conditional breakpoints if the target doesn't have hardware single | |
5357 | step. */ | |
5358 | return can_hardware_single_step (); | |
5359 | } | |
5360 | ||
e013ee27 OF |
5361 | static int |
5362 | linux_stopped_by_watchpoint (void) | |
5363 | { | |
0bfdf32f | 5364 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 5365 | |
15c66dd6 | 5366 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
5367 | } |
5368 | ||
5369 | static CORE_ADDR | |
5370 | linux_stopped_data_address (void) | |
5371 | { | |
0bfdf32f | 5372 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
5373 | |
5374 | return lwp->stopped_data_address; | |
e013ee27 OF |
5375 | } |
5376 | ||
db0dfaa0 LM |
5377 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
5378 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
5379 | && defined(PT_TEXT_END_ADDR) | |
5380 | ||
5381 | /* This is only used for targets that define PT_TEXT_ADDR, | |
5382 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
5383 | the target has different ways of acquiring this information, like | |
5384 | loadmaps. */ | |
52fb6437 NS |
5385 | |
5386 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
5387 | to tell gdb about. */ | |
5388 | ||
5389 | static int | |
5390 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
5391 | { | |
52fb6437 | 5392 | unsigned long text, text_end, data; |
62828379 | 5393 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
5394 | |
5395 | errno = 0; | |
5396 | ||
b8e1b30e LM |
5397 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
5398 | (PTRACE_TYPE_ARG4) 0); | |
5399 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
5400 | (PTRACE_TYPE_ARG4) 0); | |
5401 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
5402 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
5403 | |
5404 | if (errno == 0) | |
5405 | { | |
5406 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
5407 | used by gdb) are relative to the beginning of the program, |
5408 | with the data segment immediately following the text segment. | |
5409 | However, the actual runtime layout in memory may put the data | |
5410 | somewhere else, so when we send gdb a data base-address, we | |
5411 | use the real data base address and subtract the compile-time | |
5412 | data base-address from it (which is just the length of the | |
5413 | text segment). BSS immediately follows data in both | |
5414 | cases. */ | |
52fb6437 NS |
5415 | *text_p = text; |
5416 | *data_p = data - (text_end - text); | |
1b3f6016 | 5417 | |
52fb6437 NS |
5418 | return 1; |
5419 | } | |
52fb6437 NS |
5420 | return 0; |
5421 | } | |
5422 | #endif | |
5423 | ||
07e059b5 VP |
5424 | static int |
5425 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
5426 | unsigned char *readbuf, unsigned const char *writebuf, |
5427 | CORE_ADDR offset, int len) | |
07e059b5 | 5428 | { |
d26e3629 | 5429 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5430 | } |
5431 | ||
d0722149 DE |
5432 | /* Convert a native/host siginfo object, into/from the siginfo in the |
5433 | layout of the inferiors' architecture. */ | |
5434 | ||
5435 | static void | |
a5362b9a | 5436 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
5437 | { |
5438 | int done = 0; | |
5439 | ||
5440 | if (the_low_target.siginfo_fixup != NULL) | |
5441 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
5442 | ||
5443 | /* If there was no callback, or the callback didn't do anything, | |
5444 | then just do a straight memcpy. */ | |
5445 | if (!done) | |
5446 | { | |
5447 | if (direction == 1) | |
a5362b9a | 5448 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 5449 | else |
a5362b9a | 5450 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
5451 | } |
5452 | } | |
5453 | ||
4aa995e1 PA |
5454 | static int |
5455 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
5456 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
5457 | { | |
d0722149 | 5458 | int pid; |
a5362b9a TS |
5459 | siginfo_t siginfo; |
5460 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 | 5461 | |
0bfdf32f | 5462 | if (current_thread == NULL) |
4aa995e1 PA |
5463 | return -1; |
5464 | ||
0bfdf32f | 5465 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
5466 | |
5467 | if (debug_threads) | |
87ce2a04 DE |
5468 | debug_printf ("%s siginfo for lwp %d.\n", |
5469 | readbuf != NULL ? "Reading" : "Writing", | |
5470 | pid); | |
4aa995e1 | 5471 | |
0adea5f7 | 5472 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
5473 | return -1; |
5474 | ||
b8e1b30e | 5475 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5476 | return -1; |
5477 | ||
d0722149 DE |
5478 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
5479 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
5480 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
5481 | with a 32-bit GDBSERVER, we need to convert it. */ | |
5482 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
5483 | ||
4aa995e1 PA |
5484 | if (offset + len > sizeof (siginfo)) |
5485 | len = sizeof (siginfo) - offset; | |
5486 | ||
5487 | if (readbuf != NULL) | |
d0722149 | 5488 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
5489 | else |
5490 | { | |
d0722149 DE |
5491 | memcpy (inf_siginfo + offset, writebuf, len); |
5492 | ||
5493 | /* Convert back to ptrace layout before flushing it out. */ | |
5494 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
5495 | ||
b8e1b30e | 5496 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5497 | return -1; |
5498 | } | |
5499 | ||
5500 | return len; | |
5501 | } | |
5502 | ||
bd99dc85 PA |
5503 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5504 | so we notice when children change state; as the handler for the | |
5505 | sigsuspend in my_waitpid. */ | |
5506 | ||
5507 | static void | |
5508 | sigchld_handler (int signo) | |
5509 | { | |
5510 | int old_errno = errno; | |
5511 | ||
5512 | if (debug_threads) | |
e581f2b4 PA |
5513 | { |
5514 | do | |
5515 | { | |
5516 | /* fprintf is not async-signal-safe, so call write | |
5517 | directly. */ | |
5518 | if (write (2, "sigchld_handler\n", | |
5519 | sizeof ("sigchld_handler\n") - 1) < 0) | |
5520 | break; /* just ignore */ | |
5521 | } while (0); | |
5522 | } | |
bd99dc85 PA |
5523 | |
5524 | if (target_is_async_p ()) | |
5525 | async_file_mark (); /* trigger a linux_wait */ | |
5526 | ||
5527 | errno = old_errno; | |
5528 | } | |
5529 | ||
5530 | static int | |
5531 | linux_supports_non_stop (void) | |
5532 | { | |
5533 | return 1; | |
5534 | } | |
5535 | ||
5536 | static int | |
5537 | linux_async (int enable) | |
5538 | { | |
7089dca4 | 5539 | int previous = target_is_async_p (); |
bd99dc85 | 5540 | |
8336d594 | 5541 | if (debug_threads) |
87ce2a04 DE |
5542 | debug_printf ("linux_async (%d), previous=%d\n", |
5543 | enable, previous); | |
8336d594 | 5544 | |
bd99dc85 PA |
5545 | if (previous != enable) |
5546 | { | |
5547 | sigset_t mask; | |
5548 | sigemptyset (&mask); | |
5549 | sigaddset (&mask, SIGCHLD); | |
5550 | ||
5551 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
5552 | ||
5553 | if (enable) | |
5554 | { | |
5555 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
5556 | { |
5557 | linux_event_pipe[0] = -1; | |
5558 | linux_event_pipe[1] = -1; | |
5559 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5560 | ||
5561 | warning ("creating event pipe failed."); | |
5562 | return previous; | |
5563 | } | |
bd99dc85 PA |
5564 | |
5565 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5566 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5567 | ||
5568 | /* Register the event loop handler. */ | |
5569 | add_file_handler (linux_event_pipe[0], | |
5570 | handle_target_event, NULL); | |
5571 | ||
5572 | /* Always trigger a linux_wait. */ | |
5573 | async_file_mark (); | |
5574 | } | |
5575 | else | |
5576 | { | |
5577 | delete_file_handler (linux_event_pipe[0]); | |
5578 | ||
5579 | close (linux_event_pipe[0]); | |
5580 | close (linux_event_pipe[1]); | |
5581 | linux_event_pipe[0] = -1; | |
5582 | linux_event_pipe[1] = -1; | |
5583 | } | |
5584 | ||
5585 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5586 | } | |
5587 | ||
5588 | return previous; | |
5589 | } | |
5590 | ||
5591 | static int | |
5592 | linux_start_non_stop (int nonstop) | |
5593 | { | |
5594 | /* Register or unregister from event-loop accordingly. */ | |
5595 | linux_async (nonstop); | |
aa96c426 GB |
5596 | |
5597 | if (target_is_async_p () != (nonstop != 0)) | |
5598 | return -1; | |
5599 | ||
bd99dc85 PA |
5600 | return 0; |
5601 | } | |
5602 | ||
cf8fd78b PA |
5603 | static int |
5604 | linux_supports_multi_process (void) | |
5605 | { | |
5606 | return 1; | |
5607 | } | |
5608 | ||
89245bc0 DB |
5609 | /* Check if fork events are supported. */ |
5610 | ||
5611 | static int | |
5612 | linux_supports_fork_events (void) | |
5613 | { | |
5614 | return linux_supports_tracefork (); | |
5615 | } | |
5616 | ||
5617 | /* Check if vfork events are supported. */ | |
5618 | ||
5619 | static int | |
5620 | linux_supports_vfork_events (void) | |
5621 | { | |
5622 | return linux_supports_tracefork (); | |
5623 | } | |
5624 | ||
de0d863e DB |
5625 | /* Callback for 'find_inferior'. Set the (possibly changed) ptrace |
5626 | options for the specified lwp. */ | |
5627 | ||
5628 | static int | |
5629 | reset_lwp_ptrace_options_callback (struct inferior_list_entry *entry, | |
5630 | void *args) | |
5631 | { | |
5632 | struct thread_info *thread = (struct thread_info *) entry; | |
5633 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5634 | ||
5635 | if (!lwp->stopped) | |
5636 | { | |
5637 | /* Stop the lwp so we can modify its ptrace options. */ | |
5638 | lwp->must_set_ptrace_flags = 1; | |
5639 | linux_stop_lwp (lwp); | |
5640 | } | |
5641 | else | |
5642 | { | |
5643 | /* Already stopped; go ahead and set the ptrace options. */ | |
5644 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
5645 | int options = linux_low_ptrace_options (proc->attached); | |
5646 | ||
5647 | linux_enable_event_reporting (lwpid_of (thread), options); | |
5648 | lwp->must_set_ptrace_flags = 0; | |
5649 | } | |
5650 | ||
5651 | return 0; | |
5652 | } | |
5653 | ||
5654 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the | |
5655 | ptrace flags for all inferiors. This is in case the new GDB connection | |
5656 | doesn't support the same set of events that the previous one did. */ | |
5657 | ||
5658 | static void | |
5659 | linux_handle_new_gdb_connection (void) | |
5660 | { | |
5661 | pid_t pid; | |
5662 | ||
5663 | /* Request that all the lwps reset their ptrace options. */ | |
5664 | find_inferior (&all_threads, reset_lwp_ptrace_options_callback , &pid); | |
5665 | } | |
5666 | ||
03583c20 UW |
5667 | static int |
5668 | linux_supports_disable_randomization (void) | |
5669 | { | |
5670 | #ifdef HAVE_PERSONALITY | |
5671 | return 1; | |
5672 | #else | |
5673 | return 0; | |
5674 | #endif | |
5675 | } | |
efcbbd14 | 5676 | |
d1feda86 YQ |
5677 | static int |
5678 | linux_supports_agent (void) | |
5679 | { | |
5680 | return 1; | |
5681 | } | |
5682 | ||
c2d6af84 PA |
5683 | static int |
5684 | linux_supports_range_stepping (void) | |
5685 | { | |
5686 | if (*the_low_target.supports_range_stepping == NULL) | |
5687 | return 0; | |
5688 | ||
5689 | return (*the_low_target.supports_range_stepping) (); | |
5690 | } | |
5691 | ||
efcbbd14 UW |
5692 | /* Enumerate spufs IDs for process PID. */ |
5693 | static int | |
5694 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
5695 | { | |
5696 | int pos = 0; | |
5697 | int written = 0; | |
5698 | char path[128]; | |
5699 | DIR *dir; | |
5700 | struct dirent *entry; | |
5701 | ||
5702 | sprintf (path, "/proc/%ld/fd", pid); | |
5703 | dir = opendir (path); | |
5704 | if (!dir) | |
5705 | return -1; | |
5706 | ||
5707 | rewinddir (dir); | |
5708 | while ((entry = readdir (dir)) != NULL) | |
5709 | { | |
5710 | struct stat st; | |
5711 | struct statfs stfs; | |
5712 | int fd; | |
5713 | ||
5714 | fd = atoi (entry->d_name); | |
5715 | if (!fd) | |
5716 | continue; | |
5717 | ||
5718 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
5719 | if (stat (path, &st) != 0) | |
5720 | continue; | |
5721 | if (!S_ISDIR (st.st_mode)) | |
5722 | continue; | |
5723 | ||
5724 | if (statfs (path, &stfs) != 0) | |
5725 | continue; | |
5726 | if (stfs.f_type != SPUFS_MAGIC) | |
5727 | continue; | |
5728 | ||
5729 | if (pos >= offset && pos + 4 <= offset + len) | |
5730 | { | |
5731 | *(unsigned int *)(buf + pos - offset) = fd; | |
5732 | written += 4; | |
5733 | } | |
5734 | pos += 4; | |
5735 | } | |
5736 | ||
5737 | closedir (dir); | |
5738 | return written; | |
5739 | } | |
5740 | ||
5741 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5742 | object type, using the /proc file system. */ | |
5743 | static int | |
5744 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
5745 | unsigned const char *writebuf, | |
5746 | CORE_ADDR offset, int len) | |
5747 | { | |
0bfdf32f | 5748 | long pid = lwpid_of (current_thread); |
efcbbd14 UW |
5749 | char buf[128]; |
5750 | int fd = 0; | |
5751 | int ret = 0; | |
5752 | ||
5753 | if (!writebuf && !readbuf) | |
5754 | return -1; | |
5755 | ||
5756 | if (!*annex) | |
5757 | { | |
5758 | if (!readbuf) | |
5759 | return -1; | |
5760 | else | |
5761 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5762 | } | |
5763 | ||
5764 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5765 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5766 | if (fd <= 0) | |
5767 | return -1; | |
5768 | ||
5769 | if (offset != 0 | |
5770 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5771 | { | |
5772 | close (fd); | |
5773 | return 0; | |
5774 | } | |
5775 | ||
5776 | if (writebuf) | |
5777 | ret = write (fd, writebuf, (size_t) len); | |
5778 | else | |
5779 | ret = read (fd, readbuf, (size_t) len); | |
5780 | ||
5781 | close (fd); | |
5782 | return ret; | |
5783 | } | |
5784 | ||
723b724b | 5785 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5786 | struct target_loadseg |
5787 | { | |
5788 | /* Core address to which the segment is mapped. */ | |
5789 | Elf32_Addr addr; | |
5790 | /* VMA recorded in the program header. */ | |
5791 | Elf32_Addr p_vaddr; | |
5792 | /* Size of this segment in memory. */ | |
5793 | Elf32_Word p_memsz; | |
5794 | }; | |
5795 | ||
723b724b | 5796 | # if defined PT_GETDSBT |
78d85199 YQ |
5797 | struct target_loadmap |
5798 | { | |
5799 | /* Protocol version number, must be zero. */ | |
5800 | Elf32_Word version; | |
5801 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5802 | unsigned *dsbt_table; | |
5803 | unsigned dsbt_size, dsbt_index; | |
5804 | /* Number of segments in this map. */ | |
5805 | Elf32_Word nsegs; | |
5806 | /* The actual memory map. */ | |
5807 | struct target_loadseg segs[/*nsegs*/]; | |
5808 | }; | |
723b724b MF |
5809 | # define LINUX_LOADMAP PT_GETDSBT |
5810 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5811 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5812 | # else | |
5813 | struct target_loadmap | |
5814 | { | |
5815 | /* Protocol version number, must be zero. */ | |
5816 | Elf32_Half version; | |
5817 | /* Number of segments in this map. */ | |
5818 | Elf32_Half nsegs; | |
5819 | /* The actual memory map. */ | |
5820 | struct target_loadseg segs[/*nsegs*/]; | |
5821 | }; | |
5822 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5823 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5824 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5825 | # endif | |
78d85199 | 5826 | |
78d85199 YQ |
5827 | static int |
5828 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5829 | unsigned char *myaddr, unsigned int len) | |
5830 | { | |
0bfdf32f | 5831 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
5832 | int addr = -1; |
5833 | struct target_loadmap *data = NULL; | |
5834 | unsigned int actual_length, copy_length; | |
5835 | ||
5836 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5837 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5838 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5839 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5840 | else |
5841 | return -1; | |
5842 | ||
723b724b | 5843 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5844 | return -1; |
5845 | ||
5846 | if (data == NULL) | |
5847 | return -1; | |
5848 | ||
5849 | actual_length = sizeof (struct target_loadmap) | |
5850 | + sizeof (struct target_loadseg) * data->nsegs; | |
5851 | ||
5852 | if (offset < 0 || offset > actual_length) | |
5853 | return -1; | |
5854 | ||
5855 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5856 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5857 | return copy_length; | |
5858 | } | |
723b724b MF |
5859 | #else |
5860 | # define linux_read_loadmap NULL | |
5861 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5862 | |
1570b33e L |
5863 | static void |
5864 | linux_process_qsupported (const char *query) | |
5865 | { | |
5866 | if (the_low_target.process_qsupported != NULL) | |
5867 | the_low_target.process_qsupported (query); | |
5868 | } | |
5869 | ||
219f2f23 PA |
5870 | static int |
5871 | linux_supports_tracepoints (void) | |
5872 | { | |
5873 | if (*the_low_target.supports_tracepoints == NULL) | |
5874 | return 0; | |
5875 | ||
5876 | return (*the_low_target.supports_tracepoints) (); | |
5877 | } | |
5878 | ||
5879 | static CORE_ADDR | |
5880 | linux_read_pc (struct regcache *regcache) | |
5881 | { | |
5882 | if (the_low_target.get_pc == NULL) | |
5883 | return 0; | |
5884 | ||
5885 | return (*the_low_target.get_pc) (regcache); | |
5886 | } | |
5887 | ||
5888 | static void | |
5889 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5890 | { | |
5891 | gdb_assert (the_low_target.set_pc != NULL); | |
5892 | ||
5893 | (*the_low_target.set_pc) (regcache, pc); | |
5894 | } | |
5895 | ||
8336d594 PA |
5896 | static int |
5897 | linux_thread_stopped (struct thread_info *thread) | |
5898 | { | |
5899 | return get_thread_lwp (thread)->stopped; | |
5900 | } | |
5901 | ||
5902 | /* This exposes stop-all-threads functionality to other modules. */ | |
5903 | ||
5904 | static void | |
7984d532 | 5905 | linux_pause_all (int freeze) |
8336d594 | 5906 | { |
7984d532 PA |
5907 | stop_all_lwps (freeze, NULL); |
5908 | } | |
5909 | ||
5910 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5911 | modules. */ | |
5912 | ||
5913 | static void | |
5914 | linux_unpause_all (int unfreeze) | |
5915 | { | |
5916 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5917 | } |
5918 | ||
90d74c30 PA |
5919 | static int |
5920 | linux_prepare_to_access_memory (void) | |
5921 | { | |
5922 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5923 | running LWP. */ | |
5924 | if (non_stop) | |
5925 | linux_pause_all (1); | |
5926 | return 0; | |
5927 | } | |
5928 | ||
5929 | static void | |
0146f85b | 5930 | linux_done_accessing_memory (void) |
90d74c30 PA |
5931 | { |
5932 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5933 | running LWP. */ | |
5934 | if (non_stop) | |
5935 | linux_unpause_all (1); | |
5936 | } | |
5937 | ||
fa593d66 PA |
5938 | static int |
5939 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5940 | CORE_ADDR collector, | |
5941 | CORE_ADDR lockaddr, | |
5942 | ULONGEST orig_size, | |
5943 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5944 | CORE_ADDR *trampoline, |
5945 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5946 | unsigned char *jjump_pad_insn, |
5947 | ULONGEST *jjump_pad_insn_size, | |
5948 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5949 | CORE_ADDR *adjusted_insn_addr_end, |
5950 | char *err) | |
fa593d66 PA |
5951 | { |
5952 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5953 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5954 | jump_entry, trampoline, trampoline_size, |
5955 | jjump_pad_insn, jjump_pad_insn_size, | |
5956 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5957 | err); | |
fa593d66 PA |
5958 | } |
5959 | ||
6a271cae PA |
5960 | static struct emit_ops * |
5961 | linux_emit_ops (void) | |
5962 | { | |
5963 | if (the_low_target.emit_ops != NULL) | |
5964 | return (*the_low_target.emit_ops) (); | |
5965 | else | |
5966 | return NULL; | |
5967 | } | |
5968 | ||
405f8e94 SS |
5969 | static int |
5970 | linux_get_min_fast_tracepoint_insn_len (void) | |
5971 | { | |
5972 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5973 | } | |
5974 | ||
2268b414 JK |
5975 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5976 | ||
5977 | static int | |
5978 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5979 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5980 | { | |
5981 | char filename[PATH_MAX]; | |
5982 | int fd; | |
5983 | const int auxv_size = is_elf64 | |
5984 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5985 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5986 | ||
5987 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5988 | ||
5989 | fd = open (filename, O_RDONLY); | |
5990 | if (fd < 0) | |
5991 | return 1; | |
5992 | ||
5993 | *phdr_memaddr = 0; | |
5994 | *num_phdr = 0; | |
5995 | while (read (fd, buf, auxv_size) == auxv_size | |
5996 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5997 | { | |
5998 | if (is_elf64) | |
5999 | { | |
6000 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6001 | ||
6002 | switch (aux->a_type) | |
6003 | { | |
6004 | case AT_PHDR: | |
6005 | *phdr_memaddr = aux->a_un.a_val; | |
6006 | break; | |
6007 | case AT_PHNUM: | |
6008 | *num_phdr = aux->a_un.a_val; | |
6009 | break; | |
6010 | } | |
6011 | } | |
6012 | else | |
6013 | { | |
6014 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6015 | ||
6016 | switch (aux->a_type) | |
6017 | { | |
6018 | case AT_PHDR: | |
6019 | *phdr_memaddr = aux->a_un.a_val; | |
6020 | break; | |
6021 | case AT_PHNUM: | |
6022 | *num_phdr = aux->a_un.a_val; | |
6023 | break; | |
6024 | } | |
6025 | } | |
6026 | } | |
6027 | ||
6028 | close (fd); | |
6029 | ||
6030 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6031 | { | |
6032 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6033 | "phdr_memaddr = %ld, phdr_num = %d", | |
6034 | (long) *phdr_memaddr, *num_phdr); | |
6035 | return 2; | |
6036 | } | |
6037 | ||
6038 | return 0; | |
6039 | } | |
6040 | ||
700ca40f JK |
6041 | /* Linearly traverse pheaders and look for P_TYPE pheader. */ |
6042 | ||
6043 | static const void * | |
6044 | find_phdr (const int is_elf64, const void *const phdr_begin, | |
6045 | const void *const phdr_end, const ULONGEST p_type) | |
6046 | { | |
6047 | #define PHDR_NEXT(hdrp) ((const void *) ((const gdb_byte *) (hdrp) + \ | |
6048 | ELFXX_SIZEOF (is_elf64, *hdrp))) | |
6049 | ||
6050 | const ElfXX_Phdr *phdr = phdr_begin; | |
6051 | ||
6052 | while (PHDR_NEXT (phdr) <= phdr_end) | |
6053 | { | |
6054 | if (ELFXX_FLD (is_elf64, *phdr, p_type) == p_type) | |
6055 | return phdr; | |
6056 | phdr = PHDR_NEXT (phdr); | |
6057 | } | |
6058 | ||
6059 | return NULL; | |
6060 | #undef PHDR_NEXT | |
6061 | } | |
6062 | ||
2268b414 JK |
6063 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ |
6064 | ||
6065 | static CORE_ADDR | |
6066 | get_dynamic (const int pid, const int is_elf64) | |
6067 | { | |
6068 | CORE_ADDR phdr_memaddr, relocation; | |
700ca40f | 6069 | int num_phdr; |
2268b414 | 6070 | unsigned char *phdr_buf; |
700ca40f JK |
6071 | const ElfXX_Phdr *phdr; |
6072 | const int phdr_size = ELFXX_SIZEOF (is_elf64, *phdr); | |
2268b414 JK |
6073 | |
6074 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6075 | return 0; | |
6076 | ||
6077 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
6078 | phdr_buf = alloca (num_phdr * phdr_size); | |
6079 | ||
6080 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6081 | return 0; | |
6082 | ||
6083 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6084 | non-zero for PIE ones. */ | |
6085 | relocation = -1; | |
700ca40f JK |
6086 | phdr = find_phdr (is_elf64, phdr_buf, phdr_buf + num_phdr * phdr_size, |
6087 | PT_PHDR); | |
6088 | if (phdr != NULL) | |
6089 | relocation = phdr_memaddr - ELFXX_FLD (is_elf64, *phdr, p_vaddr); | |
2268b414 JK |
6090 | if (relocation == -1) |
6091 | { | |
e237a7e2 JK |
6092 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6093 | any real world executables, including PIE executables, have always | |
6094 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6095 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6096 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6097 | ||
6098 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6099 | ||
6100 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6101 | ||
2268b414 JK |
6102 | return 0; |
6103 | } | |
6104 | ||
700ca40f JK |
6105 | phdr = find_phdr (is_elf64, phdr_buf, phdr_buf + num_phdr * phdr_size, |
6106 | PT_DYNAMIC); | |
2268b414 | 6107 | |
700ca40f JK |
6108 | if (phdr != NULL) |
6109 | return ELFXX_FLD (is_elf64, *phdr, p_vaddr) + relocation; | |
2268b414 JK |
6110 | |
6111 | return 0; | |
6112 | } | |
6113 | ||
6114 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6115 | can be 0 if the inferior does not yet have the library list initialized. |
6116 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6117 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6118 | |
6119 | static CORE_ADDR | |
6120 | get_r_debug (const int pid, const int is_elf64) | |
6121 | { | |
6122 | CORE_ADDR dynamic_memaddr; | |
6123 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6124 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6125 | CORE_ADDR map = -1; |
2268b414 JK |
6126 | |
6127 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6128 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6129 | return map; |
2268b414 JK |
6130 | |
6131 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6132 | { | |
6133 | if (is_elf64) | |
6134 | { | |
6135 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
75f62ce7 | 6136 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
6137 | union |
6138 | { | |
6139 | Elf64_Xword map; | |
6140 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6141 | } | |
6142 | rld_map; | |
6143 | ||
6144 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
6145 | { | |
6146 | if (linux_read_memory (dyn->d_un.d_val, | |
6147 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6148 | return rld_map.map; | |
6149 | else | |
6150 | break; | |
6151 | } | |
75f62ce7 | 6152 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 6153 | |
367ba2c2 MR |
6154 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6155 | map = dyn->d_un.d_val; | |
2268b414 JK |
6156 | |
6157 | if (dyn->d_tag == DT_NULL) | |
6158 | break; | |
6159 | } | |
6160 | else | |
6161 | { | |
6162 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
75f62ce7 | 6163 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
6164 | union |
6165 | { | |
6166 | Elf32_Word map; | |
6167 | unsigned char buf[sizeof (Elf32_Word)]; | |
6168 | } | |
6169 | rld_map; | |
6170 | ||
6171 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
6172 | { | |
6173 | if (linux_read_memory (dyn->d_un.d_val, | |
6174 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6175 | return rld_map.map; | |
6176 | else | |
6177 | break; | |
6178 | } | |
75f62ce7 | 6179 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 6180 | |
367ba2c2 MR |
6181 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6182 | map = dyn->d_un.d_val; | |
2268b414 JK |
6183 | |
6184 | if (dyn->d_tag == DT_NULL) | |
6185 | break; | |
6186 | } | |
6187 | ||
6188 | dynamic_memaddr += dyn_size; | |
6189 | } | |
6190 | ||
367ba2c2 | 6191 | return map; |
2268b414 JK |
6192 | } |
6193 | ||
6194 | /* Read one pointer from MEMADDR in the inferior. */ | |
6195 | ||
6196 | static int | |
6197 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
6198 | { | |
485f1ee4 PA |
6199 | int ret; |
6200 | ||
6201 | /* Go through a union so this works on either big or little endian | |
6202 | hosts, when the inferior's pointer size is smaller than the size | |
6203 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
6204 | same of the superior's. */ | |
6205 | union | |
6206 | { | |
6207 | CORE_ADDR core_addr; | |
6208 | unsigned int ui; | |
6209 | unsigned char uc; | |
6210 | } addr; | |
6211 | ||
6212 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
6213 | if (ret == 0) | |
6214 | { | |
6215 | if (ptr_size == sizeof (CORE_ADDR)) | |
6216 | *ptr = addr.core_addr; | |
6217 | else if (ptr_size == sizeof (unsigned int)) | |
6218 | *ptr = addr.ui; | |
6219 | else | |
6220 | gdb_assert_not_reached ("unhandled pointer size"); | |
6221 | } | |
6222 | return ret; | |
2268b414 JK |
6223 | } |
6224 | ||
6225 | struct link_map_offsets | |
6226 | { | |
6227 | /* Offset and size of r_debug.r_version. */ | |
6228 | int r_version_offset; | |
6229 | ||
6230 | /* Offset and size of r_debug.r_map. */ | |
6231 | int r_map_offset; | |
6232 | ||
6233 | /* Offset to l_addr field in struct link_map. */ | |
6234 | int l_addr_offset; | |
6235 | ||
6236 | /* Offset to l_name field in struct link_map. */ | |
6237 | int l_name_offset; | |
6238 | ||
6239 | /* Offset to l_ld field in struct link_map. */ | |
6240 | int l_ld_offset; | |
6241 | ||
6242 | /* Offset to l_next field in struct link_map. */ | |
6243 | int l_next_offset; | |
6244 | ||
6245 | /* Offset to l_prev field in struct link_map. */ | |
6246 | int l_prev_offset; | |
6247 | }; | |
6248 | ||
700ca40f JK |
6249 | |
6250 | /* Structure for holding a mapping. Only mapping | |
6251 | containing l_ld can have hex_build_id set. */ | |
6252 | ||
6253 | struct mapping_entry | |
6254 | { | |
6255 | /* Fields are populated from linux_find_memory_region parameters. */ | |
6256 | ||
6257 | ULONGEST vaddr; | |
6258 | ULONGEST size; | |
6259 | ULONGEST offset; | |
6260 | ULONGEST inode; | |
6261 | ||
6262 | /* Hex encoded string allocated using xmalloc, and | |
6263 | needs to be freed. It can be NULL. */ | |
6264 | ||
6265 | char *hex_build_id; | |
6266 | }; | |
6267 | ||
6268 | typedef struct mapping_entry mapping_entry_s; | |
6269 | ||
6270 | DEF_VEC_O(mapping_entry_s); | |
6271 | ||
6272 | /* Free vector of mapping_entry_s objects. */ | |
6273 | ||
6274 | static void | |
6275 | free_mapping_entry_vec (VEC (mapping_entry_s) *lst) | |
6276 | { | |
6277 | int ix; | |
6278 | mapping_entry_s *p; | |
6279 | ||
6280 | for (ix = 0; VEC_iterate (mapping_entry_s, lst, ix, p); ++ix) | |
6281 | xfree (p->hex_build_id); | |
6282 | ||
6283 | VEC_free (mapping_entry_s, lst); | |
6284 | } | |
6285 | ||
6286 | /* Used for finding a mapping containing the given | |
6287 | l_ld passed in K. */ | |
6288 | ||
6289 | static int | |
6290 | compare_mapping_entry_range (const void *const k, const void *const b) | |
6291 | { | |
6292 | const ULONGEST key = *(const CORE_ADDR *) k; | |
6293 | const mapping_entry_s *const p = b; | |
6294 | ||
6295 | if (key < p->vaddr) | |
6296 | return -1; | |
6297 | ||
6298 | if (key < p->vaddr + p->size) | |
6299 | return 0; | |
6300 | ||
6301 | return 1; | |
6302 | } | |
6303 | ||
6304 | struct find_memory_region_callback_data | |
6305 | { | |
6306 | unsigned is_elf64; | |
6307 | ||
6308 | /* Return. Must be freed with free_mapping_entry_vec. */ | |
6309 | VEC (mapping_entry_s) *list; | |
6310 | }; | |
6311 | ||
6312 | /* Read build-id from PT_NOTE. | |
6313 | Argument LOAD_ADDR represents run time virtual address corresponding to | |
6314 | the beginning of the first loadable segment. L_ADDR is displacement | |
6315 | as supplied by the dynamic linker. */ | |
6316 | ||
6317 | static void | |
6318 | read_build_id (struct find_memory_region_callback_data *const p, | |
6319 | mapping_entry_s *const bil, const CORE_ADDR load_addr, | |
6320 | const CORE_ADDR l_addr) | |
6321 | { | |
6322 | const int is_elf64 = p->is_elf64; | |
6323 | ElfXX_Ehdr ehdr; | |
6324 | ||
6325 | if (linux_read_memory (load_addr, (unsigned char *) &ehdr, | |
6326 | ELFXX_SIZEOF (is_elf64, ehdr)) == 0 | |
6327 | && ELFXX_FLD (is_elf64, ehdr, e_ident[EI_MAG0]) == ELFMAG0 | |
6328 | && ELFXX_FLD (is_elf64, ehdr, e_ident[EI_MAG1]) == ELFMAG1 | |
6329 | && ELFXX_FLD (is_elf64, ehdr, e_ident[EI_MAG2]) == ELFMAG2 | |
6330 | && ELFXX_FLD (is_elf64, ehdr, e_ident[EI_MAG3]) == ELFMAG3) | |
6331 | { | |
6332 | const ElfXX_Phdr *phdr; | |
6333 | void *phdr_buf; | |
6334 | const unsigned e_phentsize = ELFXX_FLD (is_elf64, ehdr, e_phentsize); | |
6335 | ||
6336 | if (ELFXX_FLD (is_elf64, ehdr, e_phnum) >= 100 | |
6337 | || e_phentsize != ELFXX_SIZEOF (is_elf64, *phdr)) | |
6338 | { | |
6339 | /* Basic sanity check failed. */ | |
6340 | warning (_("Could not identify program header at %s."), | |
6341 | paddress (load_addr)); | |
6342 | return; | |
6343 | } | |
6344 | ||
6345 | phdr_buf = alloca (ELFXX_FLD (is_elf64, ehdr, e_phnum) * e_phentsize); | |
6346 | ||
6347 | if (linux_read_memory (load_addr + ELFXX_FLD (is_elf64, ehdr, e_phoff), | |
6348 | phdr_buf, | |
6349 | ELFXX_FLD (is_elf64, ehdr, e_phnum) * e_phentsize) | |
6350 | != 0) | |
6351 | { | |
6352 | warning (_("Could not read program header at %s."), | |
6353 | paddress (load_addr)); | |
6354 | return; | |
6355 | } | |
6356 | ||
6357 | phdr = phdr_buf; | |
6358 | ||
6359 | for (;;) | |
6360 | { | |
6361 | gdb_byte *pt_note; | |
6362 | const gdb_byte *pt_end; | |
6363 | const ElfXX_Nhdr *nhdr; | |
6364 | CORE_ADDR note_addr; | |
6365 | ||
6366 | phdr = find_phdr (p->is_elf64, phdr, (gdb_byte *) phdr_buf | |
6367 | + ELFXX_FLD (is_elf64, ehdr, e_phnum) * e_phentsize, | |
6368 | PT_NOTE); | |
6369 | if (phdr == NULL) | |
6370 | break; | |
6371 | pt_note = xmalloc (ELFXX_FLD (is_elf64, *phdr, p_memsz)); | |
6372 | note_addr = ELFXX_FLD (is_elf64, *phdr, p_vaddr) + l_addr; | |
6373 | if (linux_read_memory (note_addr, pt_note, | |
6374 | ELFXX_FLD (is_elf64, *phdr, p_memsz)) != 0) | |
6375 | { | |
6376 | xfree (pt_note); | |
6377 | warning (_("Could not read note at address 0x%s"), | |
6378 | paddress (note_addr)); | |
6379 | break; | |
6380 | } | |
6381 | ||
6382 | pt_end = pt_note + ELFXX_FLD (is_elf64, *phdr, p_memsz); | |
6383 | nhdr = (void *) pt_note; | |
6384 | while ((const gdb_byte *) nhdr < pt_end) | |
6385 | { | |
6386 | const size_t namesz | |
6387 | = ELFXX_ROUNDUP_4 (is_elf64, ELFXX_FLD (is_elf64, *nhdr, | |
6388 | n_namesz)); | |
6389 | const size_t descsz | |
6390 | = ELFXX_ROUNDUP_4 (is_elf64, ELFXX_FLD (is_elf64, *nhdr, | |
6391 | n_descsz)); | |
6392 | const size_t note_sz = (ELFXX_SIZEOF (is_elf64, *nhdr) + namesz | |
6393 | + descsz); | |
6394 | ||
6395 | if (((const gdb_byte *) nhdr + note_sz) > pt_end || note_sz == 0 | |
6396 | || descsz == 0) | |
6397 | { | |
6398 | warning (_("Malformed PT_NOTE at address 0x%s\n"), | |
6399 | paddress (note_addr + (gdb_byte *) nhdr - pt_note)); | |
6400 | break; | |
6401 | } | |
6402 | if (ELFXX_FLD (is_elf64, *nhdr, n_type) == NT_GNU_BUILD_ID | |
6403 | && ELFXX_FLD (is_elf64, *nhdr, n_namesz) == 4) | |
6404 | { | |
6405 | const char gnu[4] = "GNU\0"; | |
6406 | const char *const pname | |
6407 | = (char *) nhdr + ELFXX_SIZEOF (is_elf64, *nhdr); | |
6408 | ||
6409 | if (memcmp (pname, gnu, 4) == 0) | |
6410 | { | |
6411 | const size_t n_descsz = ELFXX_FLD (is_elf64, *nhdr, | |
6412 | n_descsz); | |
6413 | ||
6414 | bil->hex_build_id = xmalloc (n_descsz * 2 + 1); | |
6415 | bin2hex ((const gdb_byte *) pname + namesz, | |
6416 | bil->hex_build_id, n_descsz); | |
6417 | xfree (pt_note); | |
6418 | return; | |
6419 | } | |
6420 | } | |
6421 | nhdr = (void *) ((gdb_byte *) nhdr + note_sz); | |
6422 | } | |
6423 | xfree (pt_note); | |
6424 | } | |
6425 | } | |
6426 | } | |
6427 | ||
6428 | static linux_find_memory_region_ftype find_memory_region_callback; | |
6429 | ||
6430 | /* Add mapping_entry. See linux_find_memory_ftype for the parameters | |
6431 | description. */ | |
6432 | ||
6433 | static int | |
6434 | find_memory_region_callback (ULONGEST vaddr, ULONGEST size, ULONGEST offset, | |
6435 | ULONGEST inode, int read, int write, int exec, | |
6436 | int modified, const char *filename, void *data) | |
6437 | { | |
6438 | if (inode != 0) | |
6439 | { | |
6440 | struct find_memory_region_callback_data *const p = data; | |
6441 | mapping_entry_s bil; | |
6442 | ||
6443 | bil.vaddr = vaddr; | |
6444 | bil.size = size; | |
6445 | bil.offset = offset; | |
6446 | bil.inode = inode; | |
6447 | bil.hex_build_id = NULL; | |
6448 | ||
6449 | VEC_safe_push (mapping_entry_s, p->list, &bil); | |
6450 | } | |
6451 | ||
6452 | /* Continue the traversal. */ | |
6453 | return 0; | |
6454 | } | |
6455 | ||
6456 | /* Linear reverse find starting from RBEGIN towards REND looking for | |
6457 | the lowest vaddr mapping of the same inode and zero offset. */ | |
6458 | ||
6459 | static mapping_entry_s * | |
6460 | lrfind_mapping_entry (mapping_entry_s *const rbegin, | |
6461 | const mapping_entry_s *const rend) | |
6462 | { | |
6463 | mapping_entry_s *p; | |
6464 | ||
6465 | for (p = rbegin - 1; p >= rend; --p) | |
6466 | if (p->offset == 0 && p->inode == rbegin->inode) | |
6467 | return p; | |
6468 | ||
6469 | return NULL; | |
6470 | } | |
6471 | ||
6472 | /* Get build-id for the given L_LD, where L_LD corresponds to | |
6473 | link_map.l_ld as specified by the dynamic linker. | |
6474 | DATA must point to already filled list of mapping_entry elements. | |
6475 | ||
6476 | If build-id had not been read, read it and cache in corresponding | |
6477 | list element. | |
6478 | ||
6479 | Return build_id as stored in the list element corresponding | |
6480 | to L_LD. | |
6481 | ||
6482 | NULL may be returned if build-id could not be fetched. | |
6483 | ||
6484 | Returned string must not be freed explicitly. */ | |
6485 | ||
6486 | static const char * | |
6487 | get_hex_build_id (const CORE_ADDR l_addr, const CORE_ADDR l_ld, | |
6488 | struct find_memory_region_callback_data *const data) | |
6489 | { | |
6490 | mapping_entry_s *bil; | |
6491 | ||
6492 | bil = bsearch (&l_ld, VEC_address (mapping_entry_s, data->list), | |
6493 | VEC_length (mapping_entry_s, data->list), | |
6494 | sizeof (mapping_entry_s), compare_mapping_entry_range); | |
6495 | ||
6496 | if (bil == NULL) | |
6497 | return NULL; | |
6498 | ||
6499 | if (bil->hex_build_id == NULL) | |
6500 | { | |
6501 | mapping_entry_s *bil_min; | |
6502 | ||
6503 | bil_min = lrfind_mapping_entry (bil, VEC_address (mapping_entry_s, | |
6504 | data->list)); | |
6505 | if (bil_min != NULL) | |
6506 | read_build_id (data, bil, bil_min->vaddr, l_addr); | |
6507 | else | |
6508 | { | |
6509 | /* Do not try to find hex_build_id again. */ | |
6510 | bil->hex_build_id = xstrdup (BUILD_ID_INVALID); | |
6511 | warning (_("Could not determine load address; mapping entry with " | |
6512 | "offset 0 corresponding to l_ld = 0x%s could not be " | |
6513 | "found; build-id can not be used."), | |
6514 | paddress (l_ld)); | |
6515 | } | |
6516 | } | |
6517 | ||
6518 | return bil->hex_build_id; | |
6519 | } | |
6520 | ||
fb723180 | 6521 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
6522 | |
6523 | static int | |
6524 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
6525 | unsigned const char *writebuf, | |
6526 | CORE_ADDR offset, int len) | |
6527 | { | |
6528 | char *document; | |
6529 | unsigned document_len; | |
fe978cb0 | 6530 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
6531 | char filename[PATH_MAX]; |
6532 | int pid, is_elf64; | |
700ca40f JK |
6533 | struct find_memory_region_callback_data data; |
6534 | ||
6535 | /* COREFILTER_ANON_PRIVATE and COREFILTER_ANON_SHARED do not have an | |
6536 | associated file so it is not expected it could have an ELF header. */ | |
6537 | const enum filterflags filterflags = (COREFILTER_MAPPED_PRIVATE | |
6538 | | COREFILTER_MAPPED_SHARED | |
6539 | | COREFILTER_ELF_HEADERS | |
6540 | | COREFILTER_HUGETLB_PRIVATE | |
6541 | | COREFILTER_HUGETLB_SHARED); | |
2268b414 JK |
6542 | |
6543 | static const struct link_map_offsets lmo_32bit_offsets = | |
6544 | { | |
6545 | 0, /* r_version offset. */ | |
6546 | 4, /* r_debug.r_map offset. */ | |
6547 | 0, /* l_addr offset in link_map. */ | |
6548 | 4, /* l_name offset in link_map. */ | |
6549 | 8, /* l_ld offset in link_map. */ | |
6550 | 12, /* l_next offset in link_map. */ | |
6551 | 16 /* l_prev offset in link_map. */ | |
6552 | }; | |
6553 | ||
6554 | static const struct link_map_offsets lmo_64bit_offsets = | |
6555 | { | |
6556 | 0, /* r_version offset. */ | |
6557 | 8, /* r_debug.r_map offset. */ | |
6558 | 0, /* l_addr offset in link_map. */ | |
6559 | 8, /* l_name offset in link_map. */ | |
6560 | 16, /* l_ld offset in link_map. */ | |
6561 | 24, /* l_next offset in link_map. */ | |
6562 | 32 /* l_prev offset in link_map. */ | |
6563 | }; | |
6564 | const struct link_map_offsets *lmo; | |
214d508e | 6565 | unsigned int machine; |
b1fbec62 GB |
6566 | int ptr_size; |
6567 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
6568 | int allocated = 1024; | |
6569 | char *p; | |
6570 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
6571 | int header_done = 0; | |
2268b414 JK |
6572 | |
6573 | if (writebuf != NULL) | |
6574 | return -2; | |
6575 | if (readbuf == NULL) | |
6576 | return -1; | |
6577 | ||
0bfdf32f | 6578 | pid = lwpid_of (current_thread); |
2268b414 | 6579 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 6580 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 6581 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 6582 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 6583 | |
700ca40f JK |
6584 | data.is_elf64 = is_elf64; |
6585 | data.list = NULL; | |
6586 | VEC_reserve (mapping_entry_s, data.list, 16); | |
6587 | if (linux_find_memory_regions_full (pid, filterflags, | |
6588 | find_memory_region_callback, &data) | |
6589 | < 0) | |
6590 | warning (_("Finding memory regions failed")); | |
6591 | ||
b1fbec62 GB |
6592 | while (annex[0] != '\0') |
6593 | { | |
6594 | const char *sep; | |
6595 | CORE_ADDR *addrp; | |
6596 | int len; | |
2268b414 | 6597 | |
b1fbec62 GB |
6598 | sep = strchr (annex, '='); |
6599 | if (sep == NULL) | |
6600 | break; | |
0c5bf5a9 | 6601 | |
b1fbec62 | 6602 | len = sep - annex; |
61012eef | 6603 | if (len == 5 && startswith (annex, "start")) |
b1fbec62 | 6604 | addrp = &lm_addr; |
61012eef | 6605 | else if (len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
6606 | addrp = &lm_prev; |
6607 | else | |
6608 | { | |
6609 | annex = strchr (sep, ';'); | |
6610 | if (annex == NULL) | |
6611 | break; | |
6612 | annex++; | |
6613 | continue; | |
6614 | } | |
6615 | ||
6616 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 6617 | } |
b1fbec62 GB |
6618 | |
6619 | if (lm_addr == 0) | |
2268b414 | 6620 | { |
b1fbec62 GB |
6621 | int r_version = 0; |
6622 | ||
6623 | if (priv->r_debug == 0) | |
6624 | priv->r_debug = get_r_debug (pid, is_elf64); | |
6625 | ||
6626 | /* We failed to find DT_DEBUG. Such situation will not change | |
6627 | for this inferior - do not retry it. Report it to GDB as | |
6628 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
6629 | if (priv->r_debug == (CORE_ADDR) -1) | |
6630 | return -1; | |
6631 | ||
6632 | if (priv->r_debug != 0) | |
2268b414 | 6633 | { |
b1fbec62 GB |
6634 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
6635 | (unsigned char *) &r_version, | |
6636 | sizeof (r_version)) != 0 | |
6637 | || r_version != 1) | |
6638 | { | |
6639 | warning ("unexpected r_debug version %d", r_version); | |
6640 | } | |
6641 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
6642 | &lm_addr, ptr_size) != 0) | |
6643 | { | |
6644 | warning ("unable to read r_map from 0x%lx", | |
6645 | (long) priv->r_debug + lmo->r_map_offset); | |
6646 | } | |
2268b414 | 6647 | } |
b1fbec62 | 6648 | } |
2268b414 | 6649 | |
b1fbec62 GB |
6650 | document = xmalloc (allocated); |
6651 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
6652 | p = document + strlen (document); | |
6653 | ||
6654 | while (lm_addr | |
6655 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
6656 | &l_name, ptr_size) == 0 | |
6657 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
6658 | &l_addr, ptr_size) == 0 | |
6659 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
6660 | &l_ld, ptr_size) == 0 | |
6661 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
6662 | &l_prev, ptr_size) == 0 | |
6663 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
6664 | &l_next, ptr_size) == 0) | |
6665 | { | |
6666 | unsigned char libname[PATH_MAX]; | |
6667 | ||
6668 | if (lm_prev != l_prev) | |
2268b414 | 6669 | { |
b1fbec62 GB |
6670 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
6671 | (long) lm_prev, (long) l_prev); | |
6672 | break; | |
2268b414 JK |
6673 | } |
6674 | ||
d878444c JK |
6675 | /* Ignore the first entry even if it has valid name as the first entry |
6676 | corresponds to the main executable. The first entry should not be | |
6677 | skipped if the dynamic loader was loaded late by a static executable | |
6678 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
6679 | executable does not have PT_DYNAMIC present and this function already | |
6680 | exited above due to failed get_r_debug. */ | |
6681 | if (lm_prev == 0) | |
2268b414 | 6682 | { |
d878444c JK |
6683 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
6684 | p = p + strlen (p); | |
6685 | } | |
6686 | else | |
6687 | { | |
6688 | /* Not checking for error because reading may stop before | |
6689 | we've got PATH_MAX worth of characters. */ | |
6690 | libname[0] = '\0'; | |
6691 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
6692 | libname[sizeof (libname) - 1] = '\0'; | |
6693 | if (libname[0] != '\0') | |
2268b414 | 6694 | { |
d878444c JK |
6695 | /* 6x the size for xml_escape_text below. */ |
6696 | size_t len = 6 * strlen ((char *) libname); | |
6697 | char *name; | |
700ca40f | 6698 | const char *hex_enc_build_id = NULL; |
2268b414 | 6699 | |
d878444c JK |
6700 | if (!header_done) |
6701 | { | |
6702 | /* Terminate `<library-list-svr4'. */ | |
6703 | *p++ = '>'; | |
6704 | header_done = 1; | |
6705 | } | |
2268b414 | 6706 | |
700ca40f JK |
6707 | hex_enc_build_id = get_hex_build_id (l_addr, l_ld, &data); |
6708 | ||
6709 | while (allocated < (p - document + len + 200 | |
6710 | + (hex_enc_build_id != NULL | |
6711 | ? strlen (hex_enc_build_id) : 0))) | |
d878444c JK |
6712 | { |
6713 | /* Expand to guarantee sufficient storage. */ | |
6714 | uintptr_t document_len = p - document; | |
2268b414 | 6715 | |
d878444c JK |
6716 | document = xrealloc (document, 2 * allocated); |
6717 | allocated *= 2; | |
6718 | p = document + document_len; | |
6719 | } | |
6720 | ||
6721 | name = xml_escape_text ((char *) libname); | |
6722 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
700ca40f | 6723 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"", |
d878444c JK |
6724 | name, (unsigned long) lm_addr, |
6725 | (unsigned long) l_addr, (unsigned long) l_ld); | |
700ca40f JK |
6726 | if (hex_enc_build_id != NULL |
6727 | && strcmp (hex_enc_build_id, BUILD_ID_INVALID) != 0) | |
6728 | p += sprintf (p, " build-id=\"%s\"", hex_enc_build_id); | |
6729 | p += sprintf (p, "/>"); | |
d878444c JK |
6730 | free (name); |
6731 | } | |
0afae3cf | 6732 | } |
b1fbec62 GB |
6733 | |
6734 | lm_prev = lm_addr; | |
6735 | lm_addr = l_next; | |
2268b414 JK |
6736 | } |
6737 | ||
b1fbec62 GB |
6738 | if (!header_done) |
6739 | { | |
6740 | /* Empty list; terminate `<library-list-svr4'. */ | |
6741 | strcpy (p, "/>"); | |
6742 | } | |
6743 | else | |
6744 | strcpy (p, "</library-list-svr4>"); | |
6745 | ||
2268b414 JK |
6746 | document_len = strlen (document); |
6747 | if (offset < document_len) | |
6748 | document_len -= offset; | |
6749 | else | |
6750 | document_len = 0; | |
6751 | if (len > document_len) | |
6752 | len = document_len; | |
6753 | ||
6754 | memcpy (readbuf, document + offset, len); | |
6755 | xfree (document); | |
700ca40f | 6756 | free_mapping_entry_vec (data.list); |
2268b414 JK |
6757 | |
6758 | return len; | |
6759 | } | |
6760 | ||
9accd112 MM |
6761 | #ifdef HAVE_LINUX_BTRACE |
6762 | ||
969c39fb | 6763 | /* See to_enable_btrace target method. */ |
9accd112 MM |
6764 | |
6765 | static struct btrace_target_info * | |
f4abbc16 | 6766 | linux_low_enable_btrace (ptid_t ptid, const struct btrace_config *conf) |
9accd112 MM |
6767 | { |
6768 | struct btrace_target_info *tinfo; | |
6769 | ||
f4abbc16 | 6770 | tinfo = linux_enable_btrace (ptid, conf); |
3aee8918 | 6771 | |
d68e53f4 | 6772 | if (tinfo != NULL && tinfo->ptr_bits == 0) |
3aee8918 PA |
6773 | { |
6774 | struct thread_info *thread = find_thread_ptid (ptid); | |
6775 | struct regcache *regcache = get_thread_regcache (thread, 0); | |
6776 | ||
6777 | tinfo->ptr_bits = register_size (regcache->tdesc, 0) * 8; | |
6778 | } | |
9accd112 MM |
6779 | |
6780 | return tinfo; | |
6781 | } | |
6782 | ||
969c39fb | 6783 | /* See to_disable_btrace target method. */ |
9accd112 | 6784 | |
969c39fb MM |
6785 | static int |
6786 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
6787 | { | |
6788 | enum btrace_error err; | |
6789 | ||
6790 | err = linux_disable_btrace (tinfo); | |
6791 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
6792 | } | |
6793 | ||
b20a6524 MM |
6794 | /* Encode an Intel(R) Processor Trace configuration. */ |
6795 | ||
6796 | static void | |
6797 | linux_low_encode_pt_config (struct buffer *buffer, | |
6798 | const struct btrace_data_pt_config *config) | |
6799 | { | |
6800 | buffer_grow_str (buffer, "<pt-config>\n"); | |
6801 | ||
6802 | switch (config->cpu.vendor) | |
6803 | { | |
6804 | case CV_INTEL: | |
6805 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
6806 | "model=\"%u\" stepping=\"%u\"/>\n", | |
6807 | config->cpu.family, config->cpu.model, | |
6808 | config->cpu.stepping); | |
6809 | break; | |
6810 | ||
6811 | default: | |
6812 | break; | |
6813 | } | |
6814 | ||
6815 | buffer_grow_str (buffer, "</pt-config>\n"); | |
6816 | } | |
6817 | ||
6818 | /* Encode a raw buffer. */ | |
6819 | ||
6820 | static void | |
6821 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
6822 | unsigned int size) | |
6823 | { | |
6824 | if (size == 0) | |
6825 | return; | |
6826 | ||
6827 | /* We use hex encoding - see common/rsp-low.h. */ | |
6828 | buffer_grow_str (buffer, "<raw>\n"); | |
6829 | ||
6830 | while (size-- > 0) | |
6831 | { | |
6832 | char elem[2]; | |
6833 | ||
6834 | elem[0] = tohex ((*data >> 4) & 0xf); | |
6835 | elem[1] = tohex (*data++ & 0xf); | |
6836 | ||
6837 | buffer_grow (buffer, elem, 2); | |
6838 | } | |
6839 | ||
6840 | buffer_grow_str (buffer, "</raw>\n"); | |
6841 | } | |
6842 | ||
969c39fb MM |
6843 | /* See to_read_btrace target method. */ |
6844 | ||
6845 | static int | |
9accd112 MM |
6846 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
6847 | int type) | |
6848 | { | |
734b0e4b | 6849 | struct btrace_data btrace; |
9accd112 | 6850 | struct btrace_block *block; |
969c39fb | 6851 | enum btrace_error err; |
9accd112 MM |
6852 | int i; |
6853 | ||
734b0e4b MM |
6854 | btrace_data_init (&btrace); |
6855 | ||
969c39fb MM |
6856 | err = linux_read_btrace (&btrace, tinfo, type); |
6857 | if (err != BTRACE_ERR_NONE) | |
6858 | { | |
6859 | if (err == BTRACE_ERR_OVERFLOW) | |
6860 | buffer_grow_str0 (buffer, "E.Overflow."); | |
6861 | else | |
6862 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
6863 | ||
b20a6524 | 6864 | goto err; |
969c39fb | 6865 | } |
9accd112 | 6866 | |
734b0e4b MM |
6867 | switch (btrace.format) |
6868 | { | |
6869 | case BTRACE_FORMAT_NONE: | |
6870 | buffer_grow_str0 (buffer, "E.No Trace."); | |
b20a6524 | 6871 | goto err; |
734b0e4b MM |
6872 | |
6873 | case BTRACE_FORMAT_BTS: | |
6874 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6875 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 6876 | |
734b0e4b MM |
6877 | for (i = 0; |
6878 | VEC_iterate (btrace_block_s, btrace.variant.bts.blocks, i, block); | |
6879 | i++) | |
6880 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
6881 | paddress (block->begin), paddress (block->end)); | |
9accd112 | 6882 | |
734b0e4b MM |
6883 | buffer_grow_str0 (buffer, "</btrace>\n"); |
6884 | break; | |
6885 | ||
b20a6524 MM |
6886 | case BTRACE_FORMAT_PT: |
6887 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6888 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
6889 | buffer_grow_str (buffer, "<pt>\n"); | |
6890 | ||
6891 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 6892 | |
b20a6524 MM |
6893 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
6894 | btrace.variant.pt.size); | |
6895 | ||
6896 | buffer_grow_str (buffer, "</pt>\n"); | |
6897 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
6898 | break; | |
6899 | ||
6900 | default: | |
6901 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
6902 | goto err; | |
734b0e4b | 6903 | } |
969c39fb | 6904 | |
734b0e4b | 6905 | btrace_data_fini (&btrace); |
969c39fb | 6906 | return 0; |
b20a6524 MM |
6907 | |
6908 | err: | |
6909 | btrace_data_fini (&btrace); | |
6910 | return -1; | |
9accd112 | 6911 | } |
f4abbc16 MM |
6912 | |
6913 | /* See to_btrace_conf target method. */ | |
6914 | ||
6915 | static int | |
6916 | linux_low_btrace_conf (const struct btrace_target_info *tinfo, | |
6917 | struct buffer *buffer) | |
6918 | { | |
6919 | const struct btrace_config *conf; | |
6920 | ||
6921 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
6922 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
6923 | ||
6924 | conf = linux_btrace_conf (tinfo); | |
6925 | if (conf != NULL) | |
6926 | { | |
6927 | switch (conf->format) | |
6928 | { | |
6929 | case BTRACE_FORMAT_NONE: | |
6930 | break; | |
6931 | ||
6932 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
6933 | buffer_xml_printf (buffer, "<bts"); |
6934 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
6935 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 6936 | break; |
b20a6524 MM |
6937 | |
6938 | case BTRACE_FORMAT_PT: | |
6939 | buffer_xml_printf (buffer, "<pt"); | |
6940 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
6941 | buffer_xml_printf (buffer, "/>\n"); | |
6942 | break; | |
f4abbc16 MM |
6943 | } |
6944 | } | |
6945 | ||
6946 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
6947 | return 0; | |
6948 | } | |
9accd112 MM |
6949 | #endif /* HAVE_LINUX_BTRACE */ |
6950 | ||
7b669087 GB |
6951 | /* See nat/linux-nat.h. */ |
6952 | ||
6953 | ptid_t | |
6954 | current_lwp_ptid (void) | |
6955 | { | |
6956 | return ptid_of (current_thread); | |
6957 | } | |
6958 | ||
ce3a066d DJ |
6959 | static struct target_ops linux_target_ops = { |
6960 | linux_create_inferior, | |
6961 | linux_attach, | |
6962 | linux_kill, | |
6ad8ae5c | 6963 | linux_detach, |
8336d594 | 6964 | linux_mourn, |
444d6139 | 6965 | linux_join, |
ce3a066d DJ |
6966 | linux_thread_alive, |
6967 | linux_resume, | |
6968 | linux_wait, | |
6969 | linux_fetch_registers, | |
6970 | linux_store_registers, | |
90d74c30 | 6971 | linux_prepare_to_access_memory, |
0146f85b | 6972 | linux_done_accessing_memory, |
ce3a066d DJ |
6973 | linux_read_memory, |
6974 | linux_write_memory, | |
2f2893d9 | 6975 | linux_look_up_symbols, |
ef57601b | 6976 | linux_request_interrupt, |
aa691b87 | 6977 | linux_read_auxv, |
802e8e6d | 6978 | linux_supports_z_point_type, |
d993e290 PA |
6979 | linux_insert_point, |
6980 | linux_remove_point, | |
3e572f71 PA |
6981 | linux_stopped_by_sw_breakpoint, |
6982 | linux_supports_stopped_by_sw_breakpoint, | |
6983 | linux_stopped_by_hw_breakpoint, | |
6984 | linux_supports_stopped_by_hw_breakpoint, | |
45614f15 | 6985 | linux_supports_conditional_breakpoints, |
e013ee27 OF |
6986 | linux_stopped_by_watchpoint, |
6987 | linux_stopped_data_address, | |
db0dfaa0 LM |
6988 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
6989 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
6990 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 6991 | linux_read_offsets, |
dae5f5cf DJ |
6992 | #else |
6993 | NULL, | |
6994 | #endif | |
6995 | #ifdef USE_THREAD_DB | |
6996 | thread_db_get_tls_address, | |
6997 | #else | |
6998 | NULL, | |
52fb6437 | 6999 | #endif |
efcbbd14 | 7000 | linux_qxfer_spu, |
59a016f0 | 7001 | hostio_last_error_from_errno, |
07e059b5 | 7002 | linux_qxfer_osdata, |
4aa995e1 | 7003 | linux_xfer_siginfo, |
bd99dc85 PA |
7004 | linux_supports_non_stop, |
7005 | linux_async, | |
7006 | linux_start_non_stop, | |
cdbfd419 | 7007 | linux_supports_multi_process, |
89245bc0 DB |
7008 | linux_supports_fork_events, |
7009 | linux_supports_vfork_events, | |
de0d863e | 7010 | linux_handle_new_gdb_connection, |
cdbfd419 | 7011 | #ifdef USE_THREAD_DB |
dc146f7c | 7012 | thread_db_handle_monitor_command, |
cdbfd419 | 7013 | #else |
dc146f7c | 7014 | NULL, |
cdbfd419 | 7015 | #endif |
d26e3629 | 7016 | linux_common_core_of_thread, |
78d85199 | 7017 | linux_read_loadmap, |
219f2f23 PA |
7018 | linux_process_qsupported, |
7019 | linux_supports_tracepoints, | |
7020 | linux_read_pc, | |
8336d594 PA |
7021 | linux_write_pc, |
7022 | linux_thread_stopped, | |
7984d532 | 7023 | NULL, |
711e434b | 7024 | linux_pause_all, |
7984d532 | 7025 | linux_unpause_all, |
fa593d66 | 7026 | linux_stabilize_threads, |
6a271cae | 7027 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
7028 | linux_emit_ops, |
7029 | linux_supports_disable_randomization, | |
405f8e94 | 7030 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 7031 | linux_qxfer_libraries_svr4, |
d1feda86 | 7032 | linux_supports_agent, |
9accd112 MM |
7033 | #ifdef HAVE_LINUX_BTRACE |
7034 | linux_supports_btrace, | |
7035 | linux_low_enable_btrace, | |
969c39fb | 7036 | linux_low_disable_btrace, |
9accd112 | 7037 | linux_low_read_btrace, |
f4abbc16 | 7038 | linux_low_btrace_conf, |
9accd112 MM |
7039 | #else |
7040 | NULL, | |
7041 | NULL, | |
7042 | NULL, | |
7043 | NULL, | |
f4abbc16 | 7044 | NULL, |
9accd112 | 7045 | #endif |
c2d6af84 | 7046 | linux_supports_range_stepping, |
e57f1de3 | 7047 | linux_proc_pid_to_exec_file, |
14d2069a GB |
7048 | linux_mntns_open_cloexec, |
7049 | linux_mntns_unlink, | |
7050 | linux_mntns_readlink, | |
ce3a066d DJ |
7051 | }; |
7052 | ||
0d62e5e8 DJ |
7053 | static void |
7054 | linux_init_signals () | |
7055 | { | |
7056 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
7057 | to find what the cancel signal actually is. */ | |
1a981360 | 7058 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 7059 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 7060 | #endif |
0d62e5e8 DJ |
7061 | } |
7062 | ||
3aee8918 PA |
7063 | #ifdef HAVE_LINUX_REGSETS |
7064 | void | |
7065 | initialize_regsets_info (struct regsets_info *info) | |
7066 | { | |
7067 | for (info->num_regsets = 0; | |
7068 | info->regsets[info->num_regsets].size >= 0; | |
7069 | info->num_regsets++) | |
7070 | ; | |
3aee8918 PA |
7071 | } |
7072 | #endif | |
7073 | ||
da6d8c04 DJ |
7074 | void |
7075 | initialize_low (void) | |
7076 | { | |
bd99dc85 PA |
7077 | struct sigaction sigchld_action; |
7078 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 7079 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
7080 | set_breakpoint_data (the_low_target.breakpoint, |
7081 | the_low_target.breakpoint_len); | |
0d62e5e8 | 7082 | linux_init_signals (); |
aa7c7447 | 7083 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
7084 | |
7085 | sigchld_action.sa_handler = sigchld_handler; | |
7086 | sigemptyset (&sigchld_action.sa_mask); | |
7087 | sigchld_action.sa_flags = SA_RESTART; | |
7088 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
7089 | |
7090 | initialize_low_arch (); | |
89245bc0 DB |
7091 | |
7092 | linux_check_ptrace_features (); | |
da6d8c04 | 7093 | } |