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