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