Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
ecd75fc8 | 2 | Copyright (C) 1995-2014 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 <stdio.h> |
da6d8c04 | 28 | #include <sys/ptrace.h> |
125f8a3d GB |
29 | #include "nat/linux-ptrace.h" |
30 | #include "nat/linux-procfs.h" | |
da6d8c04 DJ |
31 | #include <signal.h> |
32 | #include <sys/ioctl.h> | |
33 | #include <fcntl.h> | |
d07c63e7 | 34 | #include <string.h> |
0a30fbc4 DJ |
35 | #include <stdlib.h> |
36 | #include <unistd.h> | |
fa6a77dc | 37 | #include <errno.h> |
fd500816 | 38 | #include <sys/syscall.h> |
f9387fc3 | 39 | #include <sched.h> |
07e059b5 VP |
40 | #include <ctype.h> |
41 | #include <pwd.h> | |
42 | #include <sys/types.h> | |
43 | #include <dirent.h> | |
53ce3c39 | 44 | #include <sys/stat.h> |
efcbbd14 | 45 | #include <sys/vfs.h> |
1570b33e | 46 | #include <sys/uio.h> |
602e3198 | 47 | #include "filestuff.h" |
c144c7a0 | 48 | #include "tracepoint.h" |
533b0600 | 49 | #include "hostio.h" |
957f3f49 DE |
50 | #ifndef ELFMAG0 |
51 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
52 | then ELFMAG0 will have been defined. If it didn't get included by | |
53 | gdb_proc_service.h then including it will likely introduce a duplicate | |
54 | definition of elf_fpregset_t. */ | |
55 | #include <elf.h> | |
56 | #endif | |
efcbbd14 UW |
57 | |
58 | #ifndef SPUFS_MAGIC | |
59 | #define SPUFS_MAGIC 0x23c9b64e | |
60 | #endif | |
da6d8c04 | 61 | |
03583c20 UW |
62 | #ifdef HAVE_PERSONALITY |
63 | # include <sys/personality.h> | |
64 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
65 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
66 | # endif | |
67 | #endif | |
68 | ||
fd462a61 DJ |
69 | #ifndef O_LARGEFILE |
70 | #define O_LARGEFILE 0 | |
71 | #endif | |
72 | ||
ec8ebe72 DE |
73 | #ifndef W_STOPCODE |
74 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
75 | #endif | |
76 | ||
1a981360 PA |
77 | /* This is the kernel's hard limit. Not to be confused with |
78 | SIGRTMIN. */ | |
79 | #ifndef __SIGRTMIN | |
80 | #define __SIGRTMIN 32 | |
81 | #endif | |
82 | ||
db0dfaa0 LM |
83 | /* Some targets did not define these ptrace constants from the start, |
84 | so gdbserver defines them locally here. In the future, these may | |
85 | be removed after they are added to asm/ptrace.h. */ | |
86 | #if !(defined(PT_TEXT_ADDR) \ | |
87 | || defined(PT_DATA_ADDR) \ | |
88 | || defined(PT_TEXT_END_ADDR)) | |
89 | #if defined(__mcoldfire__) | |
90 | /* These are still undefined in 3.10 kernels. */ | |
91 | #define PT_TEXT_ADDR 49*4 | |
92 | #define PT_DATA_ADDR 50*4 | |
93 | #define PT_TEXT_END_ADDR 51*4 | |
94 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
95 | #elif defined(BFIN) | |
96 | #define PT_TEXT_ADDR 220 | |
97 | #define PT_TEXT_END_ADDR 224 | |
98 | #define PT_DATA_ADDR 228 | |
99 | /* These are still undefined in 3.10 kernels. */ | |
100 | #elif defined(__TMS320C6X__) | |
101 | #define PT_TEXT_ADDR (0x10000*4) | |
102 | #define PT_DATA_ADDR (0x10004*4) | |
103 | #define PT_TEXT_END_ADDR (0x10008*4) | |
104 | #endif | |
105 | #endif | |
106 | ||
9accd112 | 107 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 108 | # include "nat/linux-btrace.h" |
9accd112 MM |
109 | #endif |
110 | ||
8365dcf5 TJB |
111 | #ifndef HAVE_ELF32_AUXV_T |
112 | /* Copied from glibc's elf.h. */ | |
113 | typedef struct | |
114 | { | |
115 | uint32_t a_type; /* Entry type */ | |
116 | union | |
117 | { | |
118 | uint32_t a_val; /* Integer value */ | |
119 | /* We use to have pointer elements added here. We cannot do that, | |
120 | though, since it does not work when using 32-bit definitions | |
121 | on 64-bit platforms and vice versa. */ | |
122 | } a_un; | |
123 | } Elf32_auxv_t; | |
124 | #endif | |
125 | ||
126 | #ifndef HAVE_ELF64_AUXV_T | |
127 | /* Copied from glibc's elf.h. */ | |
128 | typedef struct | |
129 | { | |
130 | uint64_t a_type; /* Entry type */ | |
131 | union | |
132 | { | |
133 | uint64_t a_val; /* Integer value */ | |
134 | /* We use to have pointer elements added here. We cannot do that, | |
135 | though, since it does not work when using 32-bit definitions | |
136 | on 64-bit platforms and vice versa. */ | |
137 | } a_un; | |
138 | } Elf64_auxv_t; | |
139 | #endif | |
140 | ||
05044653 PA |
141 | /* A list of all unknown processes which receive stop signals. Some |
142 | other process will presumably claim each of these as forked | |
143 | children momentarily. */ | |
24a09b5f | 144 | |
05044653 PA |
145 | struct simple_pid_list |
146 | { | |
147 | /* The process ID. */ | |
148 | int pid; | |
149 | ||
150 | /* The status as reported by waitpid. */ | |
151 | int status; | |
152 | ||
153 | /* Next in chain. */ | |
154 | struct simple_pid_list *next; | |
155 | }; | |
156 | struct simple_pid_list *stopped_pids; | |
157 | ||
158 | /* Trivial list manipulation functions to keep track of a list of new | |
159 | stopped processes. */ | |
160 | ||
161 | static void | |
162 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
163 | { | |
164 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
165 | ||
166 | new_pid->pid = pid; | |
167 | new_pid->status = status; | |
168 | new_pid->next = *listp; | |
169 | *listp = new_pid; | |
170 | } | |
171 | ||
172 | static int | |
173 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
174 | { | |
175 | struct simple_pid_list **p; | |
176 | ||
177 | for (p = listp; *p != NULL; p = &(*p)->next) | |
178 | if ((*p)->pid == pid) | |
179 | { | |
180 | struct simple_pid_list *next = (*p)->next; | |
181 | ||
182 | *statusp = (*p)->status; | |
183 | xfree (*p); | |
184 | *p = next; | |
185 | return 1; | |
186 | } | |
187 | return 0; | |
188 | } | |
24a09b5f | 189 | |
bde24c0a PA |
190 | enum stopping_threads_kind |
191 | { | |
192 | /* Not stopping threads presently. */ | |
193 | NOT_STOPPING_THREADS, | |
194 | ||
195 | /* Stopping threads. */ | |
196 | STOPPING_THREADS, | |
197 | ||
198 | /* Stopping and suspending threads. */ | |
199 | STOPPING_AND_SUSPENDING_THREADS | |
200 | }; | |
201 | ||
202 | /* This is set while stop_all_lwps is in effect. */ | |
203 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
204 | |
205 | /* FIXME make into a target method? */ | |
24a09b5f | 206 | int using_threads = 1; |
24a09b5f | 207 | |
fa593d66 PA |
208 | /* True if we're presently stabilizing threads (moving them out of |
209 | jump pads). */ | |
210 | static int stabilizing_threads; | |
211 | ||
2acc282a | 212 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 213 | int step, int signal, siginfo_t *info); |
2bd7c093 | 214 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
215 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
216 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
fa96cb38 PA |
217 | static int linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
218 | int *wstat, int options); | |
95954743 | 219 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
b3312d80 | 220 | static struct lwp_info *add_lwp (ptid_t ptid); |
c35fafde | 221 | static int linux_stopped_by_watchpoint (void); |
95954743 | 222 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 223 | static void proceed_all_lwps (void); |
d50171e4 PA |
224 | static int finish_step_over (struct lwp_info *lwp); |
225 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
226 | static int kill_lwp (unsigned long lwpid, int signo); | |
227 | ||
228 | /* True if the low target can hardware single-step. Such targets | |
229 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
230 | ||
231 | static int | |
232 | can_hardware_single_step (void) | |
233 | { | |
234 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
235 | } | |
236 | ||
237 | /* True if the low target supports memory breakpoints. If so, we'll | |
238 | have a GET_PC implementation. */ | |
239 | ||
240 | static int | |
241 | supports_breakpoints (void) | |
242 | { | |
243 | return (the_low_target.get_pc != NULL); | |
244 | } | |
0d62e5e8 | 245 | |
fa593d66 PA |
246 | /* Returns true if this target can support fast tracepoints. This |
247 | does not mean that the in-process agent has been loaded in the | |
248 | inferior. */ | |
249 | ||
250 | static int | |
251 | supports_fast_tracepoints (void) | |
252 | { | |
253 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
254 | } | |
255 | ||
c2d6af84 PA |
256 | /* True if LWP is stopped in its stepping range. */ |
257 | ||
258 | static int | |
259 | lwp_in_step_range (struct lwp_info *lwp) | |
260 | { | |
261 | CORE_ADDR pc = lwp->stop_pc; | |
262 | ||
263 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
264 | } | |
265 | ||
0d62e5e8 DJ |
266 | struct pending_signals |
267 | { | |
268 | int signal; | |
32ca6d61 | 269 | siginfo_t info; |
0d62e5e8 DJ |
270 | struct pending_signals *prev; |
271 | }; | |
611cb4a5 | 272 | |
bd99dc85 PA |
273 | /* The read/write ends of the pipe registered as waitable file in the |
274 | event loop. */ | |
275 | static int linux_event_pipe[2] = { -1, -1 }; | |
276 | ||
277 | /* True if we're currently in async mode. */ | |
278 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
279 | ||
02fc4de7 | 280 | static void send_sigstop (struct lwp_info *lwp); |
fa96cb38 | 281 | static void wait_for_sigstop (void); |
bd99dc85 | 282 | |
d0722149 DE |
283 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
284 | ||
285 | static int | |
214d508e | 286 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 287 | { |
214d508e L |
288 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
289 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
290 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
291 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
292 | { | |
293 | *machine = header->e_machine; | |
294 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
295 | ||
296 | } | |
297 | *machine = EM_NONE; | |
298 | return -1; | |
d0722149 DE |
299 | } |
300 | ||
301 | /* Return non-zero if FILE is a 64-bit ELF file, | |
302 | zero if the file is not a 64-bit ELF file, | |
303 | and -1 if the file is not accessible or doesn't exist. */ | |
304 | ||
be07f1a2 | 305 | static int |
214d508e | 306 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 307 | { |
957f3f49 | 308 | Elf64_Ehdr header; |
d0722149 DE |
309 | int fd; |
310 | ||
311 | fd = open (file, O_RDONLY); | |
312 | if (fd < 0) | |
313 | return -1; | |
314 | ||
315 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
316 | { | |
317 | close (fd); | |
318 | return 0; | |
319 | } | |
320 | close (fd); | |
321 | ||
214d508e | 322 | return elf_64_header_p (&header, machine); |
d0722149 DE |
323 | } |
324 | ||
be07f1a2 PA |
325 | /* Accepts an integer PID; Returns true if the executable PID is |
326 | running is a 64-bit ELF file.. */ | |
327 | ||
328 | int | |
214d508e | 329 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 330 | { |
d8d2a3ee | 331 | char file[PATH_MAX]; |
be07f1a2 PA |
332 | |
333 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 334 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
335 | } |
336 | ||
bd99dc85 PA |
337 | static void |
338 | delete_lwp (struct lwp_info *lwp) | |
339 | { | |
fa96cb38 PA |
340 | struct thread_info *thr = get_lwp_thread (lwp); |
341 | ||
342 | if (debug_threads) | |
343 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
344 | ||
345 | remove_thread (thr); | |
aa5ca48f | 346 | free (lwp->arch_private); |
bd99dc85 PA |
347 | free (lwp); |
348 | } | |
349 | ||
95954743 PA |
350 | /* Add a process to the common process list, and set its private |
351 | data. */ | |
352 | ||
353 | static struct process_info * | |
354 | linux_add_process (int pid, int attached) | |
355 | { | |
356 | struct process_info *proc; | |
357 | ||
95954743 PA |
358 | proc = add_process (pid, attached); |
359 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
360 | ||
3aee8918 PA |
361 | /* Set the arch when the first LWP stops. */ |
362 | proc->private->new_inferior = 1; | |
363 | ||
aa5ca48f DE |
364 | if (the_low_target.new_process != NULL) |
365 | proc->private->arch_private = the_low_target.new_process (); | |
366 | ||
95954743 PA |
367 | return proc; |
368 | } | |
369 | ||
bd99dc85 PA |
370 | /* Handle a GNU/Linux extended wait response. If we see a clone |
371 | event, we need to add the new LWP to our list (and not report the | |
372 | trap to higher layers). */ | |
0d62e5e8 | 373 | |
24a09b5f | 374 | static void |
54a0b537 | 375 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
376 | { |
377 | int event = wstat >> 16; | |
d86d4aaf | 378 | struct thread_info *event_thr = get_lwp_thread (event_child); |
54a0b537 | 379 | struct lwp_info *new_lwp; |
24a09b5f DJ |
380 | |
381 | if (event == PTRACE_EVENT_CLONE) | |
382 | { | |
95954743 | 383 | ptid_t ptid; |
24a09b5f | 384 | unsigned long new_pid; |
05044653 | 385 | int ret, status; |
24a09b5f | 386 | |
d86d4aaf | 387 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 388 | &new_pid); |
24a09b5f DJ |
389 | |
390 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 391 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
392 | { |
393 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
394 | hits the SIGSTOP, but we're already attached. */ | |
395 | ||
97438e3f | 396 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
397 | |
398 | if (ret == -1) | |
399 | perror_with_name ("waiting for new child"); | |
400 | else if (ret != new_pid) | |
401 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 402 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
403 | warning ("wait returned unexpected status 0x%x", status); |
404 | } | |
405 | ||
fa96cb38 PA |
406 | if (debug_threads) |
407 | debug_printf ("HEW: Got clone event " | |
408 | "from LWP %ld, new child is LWP %ld\n", | |
409 | lwpid_of (event_thr), new_pid); | |
410 | ||
d86d4aaf | 411 | ptid = ptid_build (pid_of (event_thr), new_pid, 0); |
b3312d80 | 412 | new_lwp = add_lwp (ptid); |
24a09b5f | 413 | |
e27d73f6 DE |
414 | /* Either we're going to immediately resume the new thread |
415 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
416 | thinks the thread is currently running, so set this first | |
417 | before calling linux_resume_one_lwp. */ | |
418 | new_lwp->stopped = 1; | |
419 | ||
bde24c0a PA |
420 | /* If we're suspending all threads, leave this one suspended |
421 | too. */ | |
422 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
423 | new_lwp->suspended = 1; | |
424 | ||
da5898ce DJ |
425 | /* Normally we will get the pending SIGSTOP. But in some cases |
426 | we might get another signal delivered to the group first. | |
f21cc1a2 | 427 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
428 | if (WSTOPSIG (status) == SIGSTOP) |
429 | { | |
bde24c0a | 430 | if (stopping_threads != NOT_STOPPING_THREADS) |
d50171e4 PA |
431 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
432 | else | |
e27d73f6 | 433 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 434 | } |
24a09b5f | 435 | else |
da5898ce | 436 | { |
54a0b537 | 437 | new_lwp->stop_expected = 1; |
d50171e4 | 438 | |
bde24c0a | 439 | if (stopping_threads != NOT_STOPPING_THREADS) |
da5898ce | 440 | { |
d50171e4 | 441 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
442 | new_lwp->status_pending_p = 1; |
443 | new_lwp->status_pending = status; | |
da5898ce DJ |
444 | } |
445 | else | |
446 | /* Pass the signal on. This is what GDB does - except | |
447 | shouldn't we really report it instead? */ | |
e27d73f6 | 448 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 449 | } |
24a09b5f DJ |
450 | |
451 | /* Always resume the current thread. If we are stopping | |
452 | threads, it will have a pending SIGSTOP; we may as well | |
453 | collect it now. */ | |
2acc282a | 454 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
455 | } |
456 | } | |
457 | ||
d50171e4 PA |
458 | /* Return the PC as read from the regcache of LWP, without any |
459 | adjustment. */ | |
460 | ||
461 | static CORE_ADDR | |
462 | get_pc (struct lwp_info *lwp) | |
463 | { | |
464 | struct thread_info *saved_inferior; | |
465 | struct regcache *regcache; | |
466 | CORE_ADDR pc; | |
467 | ||
468 | if (the_low_target.get_pc == NULL) | |
469 | return 0; | |
470 | ||
471 | saved_inferior = current_inferior; | |
472 | current_inferior = get_lwp_thread (lwp); | |
473 | ||
474 | regcache = get_thread_regcache (current_inferior, 1); | |
475 | pc = (*the_low_target.get_pc) (regcache); | |
476 | ||
477 | if (debug_threads) | |
87ce2a04 | 478 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 PA |
479 | |
480 | current_inferior = saved_inferior; | |
481 | return pc; | |
482 | } | |
483 | ||
484 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
485 | The SIGTRAP could mean several things. |
486 | ||
487 | On i386, where decr_pc_after_break is non-zero: | |
488 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
489 | we will get only the one SIGTRAP (even if the instruction we | |
490 | stepped over was a breakpoint). The value of $eip will be the | |
491 | next instruction. | |
492 | If we continue the process using PTRACE_CONT, we will get a | |
493 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
494 | the instruction after the breakpoint (i.e. needs to be | |
495 | decremented). If we report the SIGTRAP to GDB, we must also | |
496 | report the undecremented PC. If we cancel the SIGTRAP, we | |
497 | must resume at the decremented PC. | |
498 | ||
499 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
500 | with hardware or kernel single-step: | |
501 | If we single-step over a breakpoint instruction, our PC will | |
502 | point at the following instruction. If we continue and hit a | |
503 | breakpoint instruction, our PC will point at the breakpoint | |
504 | instruction. */ | |
505 | ||
506 | static CORE_ADDR | |
d50171e4 | 507 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 508 | { |
d50171e4 PA |
509 | CORE_ADDR stop_pc; |
510 | ||
511 | if (the_low_target.get_pc == NULL) | |
512 | return 0; | |
0d62e5e8 | 513 | |
d50171e4 PA |
514 | stop_pc = get_pc (lwp); |
515 | ||
bdabb078 PA |
516 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
517 | && !lwp->stepping | |
518 | && !lwp->stopped_by_watchpoint | |
519 | && lwp->last_status >> 16 == 0) | |
47c0c975 DE |
520 | stop_pc -= the_low_target.decr_pc_after_break; |
521 | ||
522 | if (debug_threads) | |
87ce2a04 | 523 | debug_printf ("stop pc is 0x%lx\n", (long) stop_pc); |
47c0c975 DE |
524 | |
525 | return stop_pc; | |
0d62e5e8 | 526 | } |
ce3a066d | 527 | |
b3312d80 | 528 | static struct lwp_info * |
95954743 | 529 | add_lwp (ptid_t ptid) |
611cb4a5 | 530 | { |
54a0b537 | 531 | struct lwp_info *lwp; |
0d62e5e8 | 532 | |
54a0b537 PA |
533 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
534 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 535 | |
aa5ca48f DE |
536 | if (the_low_target.new_thread != NULL) |
537 | lwp->arch_private = the_low_target.new_thread (); | |
538 | ||
f7667f0d | 539 | lwp->thread = add_thread (ptid, lwp); |
0d62e5e8 | 540 | |
54a0b537 | 541 | return lwp; |
0d62e5e8 | 542 | } |
611cb4a5 | 543 | |
da6d8c04 DJ |
544 | /* Start an inferior process and returns its pid. |
545 | ALLARGS is a vector of program-name and args. */ | |
546 | ||
ce3a066d DJ |
547 | static int |
548 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 549 | { |
03583c20 UW |
550 | #ifdef HAVE_PERSONALITY |
551 | int personality_orig = 0, personality_set = 0; | |
552 | #endif | |
a6dbe5df | 553 | struct lwp_info *new_lwp; |
da6d8c04 | 554 | int pid; |
95954743 | 555 | ptid_t ptid; |
da6d8c04 | 556 | |
03583c20 UW |
557 | #ifdef HAVE_PERSONALITY |
558 | if (disable_randomization) | |
559 | { | |
560 | errno = 0; | |
561 | personality_orig = personality (0xffffffff); | |
562 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
563 | { | |
564 | personality_set = 1; | |
565 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
566 | } | |
567 | if (errno != 0 || (personality_set | |
568 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
569 | warning ("Error disabling address space randomization: %s", | |
570 | strerror (errno)); | |
571 | } | |
572 | #endif | |
573 | ||
42c81e2a | 574 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
575 | pid = vfork (); |
576 | #else | |
da6d8c04 | 577 | pid = fork (); |
52fb6437 | 578 | #endif |
da6d8c04 DJ |
579 | if (pid < 0) |
580 | perror_with_name ("fork"); | |
581 | ||
582 | if (pid == 0) | |
583 | { | |
602e3198 | 584 | close_most_fds (); |
b8e1b30e | 585 | ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da6d8c04 | 586 | |
1a981360 | 587 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 588 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 589 | #endif |
0d62e5e8 | 590 | |
a9fa9f7d DJ |
591 | setpgid (0, 0); |
592 | ||
e0f9f062 DE |
593 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
594 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
595 | Also, redirect stdin to /dev/null. */ | |
596 | if (remote_connection_is_stdio ()) | |
597 | { | |
598 | close (0); | |
599 | open ("/dev/null", O_RDONLY); | |
600 | dup2 (2, 1); | |
3e52c33d JK |
601 | if (write (2, "stdin/stdout redirected\n", |
602 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
603 | { |
604 | /* Errors ignored. */; | |
605 | } | |
e0f9f062 DE |
606 | } |
607 | ||
2b876972 DJ |
608 | execv (program, allargs); |
609 | if (errno == ENOENT) | |
610 | execvp (program, allargs); | |
da6d8c04 DJ |
611 | |
612 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 613 | strerror (errno)); |
da6d8c04 DJ |
614 | fflush (stderr); |
615 | _exit (0177); | |
616 | } | |
617 | ||
03583c20 UW |
618 | #ifdef HAVE_PERSONALITY |
619 | if (personality_set) | |
620 | { | |
621 | errno = 0; | |
622 | personality (personality_orig); | |
623 | if (errno != 0) | |
624 | warning ("Error restoring address space randomization: %s", | |
625 | strerror (errno)); | |
626 | } | |
627 | #endif | |
628 | ||
95954743 PA |
629 | linux_add_process (pid, 0); |
630 | ||
631 | ptid = ptid_build (pid, pid, 0); | |
632 | new_lwp = add_lwp (ptid); | |
a6dbe5df | 633 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 634 | |
a9fa9f7d | 635 | return pid; |
da6d8c04 DJ |
636 | } |
637 | ||
7ae1a6a6 PA |
638 | char * |
639 | linux_attach_fail_reason_string (ptid_t ptid, int err) | |
640 | { | |
641 | static char *reason_string; | |
642 | struct buffer buffer; | |
643 | char *warnings; | |
644 | long lwpid = ptid_get_lwp (ptid); | |
645 | ||
646 | xfree (reason_string); | |
647 | ||
648 | buffer_init (&buffer); | |
649 | linux_ptrace_attach_fail_reason (lwpid, &buffer); | |
650 | buffer_grow_str0 (&buffer, ""); | |
651 | warnings = buffer_finish (&buffer); | |
652 | if (warnings[0] != '\0') | |
653 | reason_string = xstrprintf ("%s (%d), %s", | |
654 | strerror (err), err, warnings); | |
655 | else | |
656 | reason_string = xstrprintf ("%s (%d)", | |
657 | strerror (err), err); | |
658 | xfree (warnings); | |
659 | return reason_string; | |
660 | } | |
661 | ||
da6d8c04 DJ |
662 | /* Attach to an inferior process. */ |
663 | ||
7ae1a6a6 PA |
664 | int |
665 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 666 | { |
54a0b537 | 667 | struct lwp_info *new_lwp; |
7ae1a6a6 | 668 | int lwpid = ptid_get_lwp (ptid); |
611cb4a5 | 669 | |
b8e1b30e | 670 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 671 | != 0) |
7ae1a6a6 | 672 | return errno; |
24a09b5f | 673 | |
b3312d80 | 674 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 675 | |
a6dbe5df PA |
676 | /* We need to wait for SIGSTOP before being able to make the next |
677 | ptrace call on this LWP. */ | |
678 | new_lwp->must_set_ptrace_flags = 1; | |
679 | ||
644cebc9 | 680 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
681 | { |
682 | if (debug_threads) | |
87ce2a04 | 683 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
684 | |
685 | /* The process is definitely stopped. It is in a job control | |
686 | stop, unless the kernel predates the TASK_STOPPED / | |
687 | TASK_TRACED distinction, in which case it might be in a | |
688 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
689 | can kill it, signal it, et cetera. | |
690 | ||
691 | First make sure there is a pending SIGSTOP. Since we are | |
692 | already attached, the process can not transition from stopped | |
693 | to running without a PTRACE_CONT; so we know this signal will | |
694 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
695 | probably already in the queue (unless this kernel is old | |
696 | enough to use TASK_STOPPED for ptrace stops); but since | |
697 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
698 | kill_lwp (lwpid, SIGSTOP); | |
699 | ||
700 | /* Finally, resume the stopped process. This will deliver the | |
701 | SIGSTOP (or a higher priority signal, just like normal | |
702 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 703 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
704 | } |
705 | ||
0d62e5e8 | 706 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
707 | brings it to a halt. |
708 | ||
709 | There are several cases to consider here: | |
710 | ||
711 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 712 | of a new thread that is being created. |
d50171e4 PA |
713 | In this case we should ignore that SIGSTOP and resume the |
714 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 715 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 716 | resume_continue. |
0e21c1ec DE |
717 | |
718 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
719 | to it via attach_inferior. |
720 | In this case we want the process thread to stop. | |
d50171e4 PA |
721 | This is handled by having linux_attach set last_resume_kind == |
722 | resume_stop after we return. | |
e3deef73 LM |
723 | |
724 | If the pid we are attaching to is also the tgid, we attach to and | |
725 | stop all the existing threads. Otherwise, we attach to pid and | |
726 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
727 | |
728 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
729 | existing threads. |
730 | In this case we want the thread to stop. | |
731 | FIXME: This case is currently not properly handled. | |
732 | We should wait for the SIGSTOP but don't. Things work apparently | |
733 | because enough time passes between when we ptrace (ATTACH) and when | |
734 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
735 | |
736 | On the other hand, if we are currently trying to stop all threads, we | |
737 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 738 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
739 | end of the list, and so the new thread has not yet reached |
740 | wait_for_sigstop (but will). */ | |
d50171e4 | 741 | new_lwp->stop_expected = 1; |
0d62e5e8 | 742 | |
7ae1a6a6 | 743 | return 0; |
95954743 PA |
744 | } |
745 | ||
e3deef73 LM |
746 | /* Attach to PID. If PID is the tgid, attach to it and all |
747 | of its threads. */ | |
748 | ||
c52daf70 | 749 | static int |
a1928bad | 750 | linux_attach (unsigned long pid) |
0d62e5e8 | 751 | { |
7ae1a6a6 PA |
752 | ptid_t ptid = ptid_build (pid, pid, 0); |
753 | int err; | |
754 | ||
e3deef73 LM |
755 | /* Attach to PID. We will check for other threads |
756 | soon. */ | |
7ae1a6a6 PA |
757 | err = linux_attach_lwp (ptid); |
758 | if (err != 0) | |
759 | error ("Cannot attach to process %ld: %s", | |
760 | pid, linux_attach_fail_reason_string (ptid, err)); | |
761 | ||
95954743 | 762 | linux_add_process (pid, 1); |
0d62e5e8 | 763 | |
bd99dc85 PA |
764 | if (!non_stop) |
765 | { | |
8336d594 PA |
766 | struct thread_info *thread; |
767 | ||
768 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
769 | process. It will be collected by wait shortly. */ | |
770 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
771 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 772 | } |
0d62e5e8 | 773 | |
e3deef73 LM |
774 | if (linux_proc_get_tgid (pid) == pid) |
775 | { | |
776 | DIR *dir; | |
777 | char pathname[128]; | |
778 | ||
779 | sprintf (pathname, "/proc/%ld/task", pid); | |
780 | ||
781 | dir = opendir (pathname); | |
782 | ||
783 | if (!dir) | |
784 | { | |
785 | fprintf (stderr, "Could not open /proc/%ld/task.\n", pid); | |
786 | fflush (stderr); | |
787 | } | |
788 | else | |
789 | { | |
790 | /* At this point we attached to the tgid. Scan the task for | |
791 | existing threads. */ | |
e3deef73 LM |
792 | int new_threads_found; |
793 | int iterations = 0; | |
e3deef73 LM |
794 | |
795 | while (iterations < 2) | |
796 | { | |
7ae1a6a6 PA |
797 | struct dirent *dp; |
798 | ||
e3deef73 LM |
799 | new_threads_found = 0; |
800 | /* Add all the other threads. While we go through the | |
801 | threads, new threads may be spawned. Cycle through | |
802 | the list of threads until we have done two iterations without | |
803 | finding new threads. */ | |
804 | while ((dp = readdir (dir)) != NULL) | |
805 | { | |
7ae1a6a6 PA |
806 | unsigned long lwp; |
807 | ptid_t ptid; | |
808 | ||
e3deef73 LM |
809 | /* Fetch one lwp. */ |
810 | lwp = strtoul (dp->d_name, NULL, 10); | |
811 | ||
7ae1a6a6 PA |
812 | ptid = ptid_build (pid, lwp, 0); |
813 | ||
e3deef73 | 814 | /* Is this a new thread? */ |
7ae1a6a6 | 815 | if (lwp != 0 && find_thread_ptid (ptid) == NULL) |
e3deef73 | 816 | { |
7ae1a6a6 | 817 | int err; |
e3deef73 LM |
818 | |
819 | if (debug_threads) | |
7ae1a6a6 PA |
820 | debug_printf ("Found new lwp %ld\n", lwp); |
821 | ||
822 | err = linux_attach_lwp (ptid); | |
823 | if (err != 0) | |
824 | warning ("Cannot attach to lwp %ld: %s", | |
825 | lwp, | |
826 | linux_attach_fail_reason_string (ptid, err)); | |
827 | ||
828 | new_threads_found++; | |
e3deef73 LM |
829 | } |
830 | } | |
831 | ||
832 | if (!new_threads_found) | |
833 | iterations++; | |
834 | else | |
835 | iterations = 0; | |
836 | ||
837 | rewinddir (dir); | |
838 | } | |
839 | closedir (dir); | |
840 | } | |
841 | } | |
842 | ||
95954743 PA |
843 | return 0; |
844 | } | |
845 | ||
846 | struct counter | |
847 | { | |
848 | int pid; | |
849 | int count; | |
850 | }; | |
851 | ||
852 | static int | |
853 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
854 | { | |
855 | struct counter *counter = args; | |
856 | ||
857 | if (ptid_get_pid (entry->id) == counter->pid) | |
858 | { | |
859 | if (++counter->count > 1) | |
860 | return 1; | |
861 | } | |
d61ddec4 | 862 | |
da6d8c04 DJ |
863 | return 0; |
864 | } | |
865 | ||
95954743 | 866 | static int |
fa96cb38 | 867 | last_thread_of_process_p (int pid) |
95954743 | 868 | { |
95954743 | 869 | struct counter counter = { pid , 0 }; |
da6d8c04 | 870 | |
95954743 PA |
871 | return (find_inferior (&all_threads, |
872 | second_thread_of_pid_p, &counter) == NULL); | |
873 | } | |
874 | ||
da84f473 PA |
875 | /* Kill LWP. */ |
876 | ||
877 | static void | |
878 | linux_kill_one_lwp (struct lwp_info *lwp) | |
879 | { | |
d86d4aaf DE |
880 | struct thread_info *thr = get_lwp_thread (lwp); |
881 | int pid = lwpid_of (thr); | |
da84f473 PA |
882 | |
883 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
884 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
885 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
886 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
887 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
888 | per process, not one for each thread. But since we still support | |
889 | linuxthreads, and we also support debugging programs using raw | |
890 | clone without CLONE_THREAD, we send one for each thread. For | |
891 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
892 | about some old kernels where PTRACE_KILL might work better | |
893 | (dubious if there are any such, but that's why it's paranoia), so | |
894 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
895 | everywhere. */ | |
896 | ||
897 | errno = 0; | |
69ff6be5 | 898 | kill_lwp (pid, SIGKILL); |
da84f473 | 899 | if (debug_threads) |
ce9e3fe7 PA |
900 | { |
901 | int save_errno = errno; | |
902 | ||
903 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
904 | target_pid_to_str (ptid_of (thr)), | |
905 | save_errno ? strerror (save_errno) : "OK"); | |
906 | } | |
da84f473 PA |
907 | |
908 | errno = 0; | |
b8e1b30e | 909 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 910 | if (debug_threads) |
ce9e3fe7 PA |
911 | { |
912 | int save_errno = errno; | |
913 | ||
914 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
915 | target_pid_to_str (ptid_of (thr)), | |
916 | save_errno ? strerror (save_errno) : "OK"); | |
917 | } | |
da84f473 PA |
918 | } |
919 | ||
e76126e8 PA |
920 | /* Kill LWP and wait for it to die. */ |
921 | ||
922 | static void | |
923 | kill_wait_lwp (struct lwp_info *lwp) | |
924 | { | |
925 | struct thread_info *thr = get_lwp_thread (lwp); | |
926 | int pid = ptid_get_pid (ptid_of (thr)); | |
927 | int lwpid = ptid_get_lwp (ptid_of (thr)); | |
928 | int wstat; | |
929 | int res; | |
930 | ||
931 | if (debug_threads) | |
932 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
933 | ||
934 | do | |
935 | { | |
936 | linux_kill_one_lwp (lwp); | |
937 | ||
938 | /* Make sure it died. Notes: | |
939 | ||
940 | - The loop is most likely unnecessary. | |
941 | ||
942 | - We don't use linux_wait_for_event as that could delete lwps | |
943 | while we're iterating over them. We're not interested in | |
944 | any pending status at this point, only in making sure all | |
945 | wait status on the kernel side are collected until the | |
946 | process is reaped. | |
947 | ||
948 | - We don't use __WALL here as the __WALL emulation relies on | |
949 | SIGCHLD, and killing a stopped process doesn't generate | |
950 | one, nor an exit status. | |
951 | */ | |
952 | res = my_waitpid (lwpid, &wstat, 0); | |
953 | if (res == -1 && errno == ECHILD) | |
954 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
955 | } while (res > 0 && WIFSTOPPED (wstat)); | |
956 | ||
957 | gdb_assert (res > 0); | |
958 | } | |
959 | ||
da84f473 PA |
960 | /* Callback for `find_inferior'. Kills an lwp of a given process, |
961 | except the leader. */ | |
95954743 PA |
962 | |
963 | static int | |
da84f473 | 964 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 965 | { |
0d62e5e8 | 966 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 967 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
968 | int pid = * (int *) args; |
969 | ||
970 | if (ptid_get_pid (entry->id) != pid) | |
971 | return 0; | |
0d62e5e8 | 972 | |
fd500816 DJ |
973 | /* We avoid killing the first thread here, because of a Linux kernel (at |
974 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
975 | the children get a chance to be reaped, it will remain a zombie | |
976 | forever. */ | |
95954743 | 977 | |
d86d4aaf | 978 | if (lwpid_of (thread) == pid) |
95954743 PA |
979 | { |
980 | if (debug_threads) | |
87ce2a04 DE |
981 | debug_printf ("lkop: is last of process %s\n", |
982 | target_pid_to_str (entry->id)); | |
95954743 PA |
983 | return 0; |
984 | } | |
fd500816 | 985 | |
e76126e8 | 986 | kill_wait_lwp (lwp); |
95954743 | 987 | return 0; |
da6d8c04 DJ |
988 | } |
989 | ||
95954743 PA |
990 | static int |
991 | linux_kill (int pid) | |
0d62e5e8 | 992 | { |
95954743 | 993 | struct process_info *process; |
54a0b537 | 994 | struct lwp_info *lwp; |
fd500816 | 995 | |
95954743 PA |
996 | process = find_process_pid (pid); |
997 | if (process == NULL) | |
998 | return -1; | |
9d606399 | 999 | |
f9e39928 PA |
1000 | /* If we're killing a running inferior, make sure it is stopped |
1001 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1002 | stop_all_lwps (0, NULL); |
f9e39928 | 1003 | |
da84f473 | 1004 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1005 | |
54a0b537 | 1006 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1007 | thread in the list, so do so now. */ |
95954743 | 1008 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1009 | |
784867a5 | 1010 | if (lwp == NULL) |
fd500816 | 1011 | { |
784867a5 | 1012 | if (debug_threads) |
d86d4aaf DE |
1013 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1014 | pid); | |
784867a5 JK |
1015 | } |
1016 | else | |
e76126e8 | 1017 | kill_wait_lwp (lwp); |
2d717e4f | 1018 | |
8336d594 | 1019 | the_target->mourn (process); |
f9e39928 PA |
1020 | |
1021 | /* Since we presently can only stop all lwps of all processes, we | |
1022 | need to unstop lwps of other processes. */ | |
7984d532 | 1023 | unstop_all_lwps (0, NULL); |
95954743 | 1024 | return 0; |
0d62e5e8 DJ |
1025 | } |
1026 | ||
9b224c5e PA |
1027 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1028 | signal the thread last stopped for, which we need to deliver to the | |
1029 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1030 | ||
1031 | static int | |
1032 | get_detach_signal (struct thread_info *thread) | |
1033 | { | |
a493e3e2 | 1034 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1035 | int status; |
1036 | struct lwp_info *lp = get_thread_lwp (thread); | |
1037 | ||
1038 | if (lp->status_pending_p) | |
1039 | status = lp->status_pending; | |
1040 | else | |
1041 | { | |
1042 | /* If the thread had been suspended by gdbserver, and it stopped | |
1043 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1044 | want to deliver that SIGSTOP. */ | |
1045 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1046 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1047 | return 0; |
1048 | ||
1049 | /* Otherwise, we may need to deliver the signal we | |
1050 | intercepted. */ | |
1051 | status = lp->last_status; | |
1052 | } | |
1053 | ||
1054 | if (!WIFSTOPPED (status)) | |
1055 | { | |
1056 | if (debug_threads) | |
87ce2a04 | 1057 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1058 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1059 | return 0; |
1060 | } | |
1061 | ||
1062 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
1063 | if (WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
1064 | { | |
1065 | if (debug_threads) | |
87ce2a04 DE |
1066 | debug_printf ("GPS: lwp %s had stopped with extended " |
1067 | "status: no pending signal\n", | |
d86d4aaf | 1068 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1069 | return 0; |
1070 | } | |
1071 | ||
2ea28649 | 1072 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1073 | |
1074 | if (program_signals_p && !program_signals[signo]) | |
1075 | { | |
1076 | if (debug_threads) | |
87ce2a04 | 1077 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1078 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1079 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1080 | return 0; |
1081 | } | |
1082 | else if (!program_signals_p | |
1083 | /* If we have no way to know which signals GDB does not | |
1084 | want to have passed to the program, assume | |
1085 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1086 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1087 | { |
1088 | if (debug_threads) | |
87ce2a04 DE |
1089 | debug_printf ("GPS: lwp %s had signal %s, " |
1090 | "but we don't know if we should pass it. " | |
1091 | "Default to not.\n", | |
d86d4aaf | 1092 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1093 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1094 | return 0; |
1095 | } | |
1096 | else | |
1097 | { | |
1098 | if (debug_threads) | |
87ce2a04 | 1099 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1100 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1101 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1102 | |
1103 | return WSTOPSIG (status); | |
1104 | } | |
1105 | } | |
1106 | ||
95954743 PA |
1107 | static int |
1108 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1109 | { |
1110 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1111 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1112 | int pid = * (int *) args; |
9b224c5e | 1113 | int sig; |
95954743 PA |
1114 | |
1115 | if (ptid_get_pid (entry->id) != pid) | |
1116 | return 0; | |
6ad8ae5c | 1117 | |
9b224c5e | 1118 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1119 | if (lwp->stop_expected) |
ae13219e | 1120 | { |
9b224c5e | 1121 | if (debug_threads) |
87ce2a04 | 1122 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1123 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1124 | |
d86d4aaf | 1125 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1126 | lwp->stop_expected = 0; |
ae13219e DJ |
1127 | } |
1128 | ||
1129 | /* Flush any pending changes to the process's registers. */ | |
d86d4aaf | 1130 | regcache_invalidate_thread (thread); |
ae13219e | 1131 | |
9b224c5e PA |
1132 | /* Pass on any pending signal for this thread. */ |
1133 | sig = get_detach_signal (thread); | |
1134 | ||
ae13219e | 1135 | /* Finally, let it resume. */ |
82bfbe7e PA |
1136 | if (the_low_target.prepare_to_resume != NULL) |
1137 | the_low_target.prepare_to_resume (lwp); | |
d86d4aaf | 1138 | if (ptrace (PTRACE_DETACH, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
b8e1b30e | 1139 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
9b224c5e | 1140 | error (_("Can't detach %s: %s"), |
d86d4aaf | 1141 | target_pid_to_str (ptid_of (thread)), |
9b224c5e | 1142 | strerror (errno)); |
bd99dc85 PA |
1143 | |
1144 | delete_lwp (lwp); | |
95954743 | 1145 | return 0; |
6ad8ae5c DJ |
1146 | } |
1147 | ||
95954743 PA |
1148 | static int |
1149 | linux_detach (int pid) | |
1150 | { | |
1151 | struct process_info *process; | |
1152 | ||
1153 | process = find_process_pid (pid); | |
1154 | if (process == NULL) | |
1155 | return -1; | |
1156 | ||
f9e39928 PA |
1157 | /* Stop all threads before detaching. First, ptrace requires that |
1158 | the thread is stopped to sucessfully detach. Second, thread_db | |
1159 | may need to uninstall thread event breakpoints from memory, which | |
1160 | only works with a stopped process anyway. */ | |
7984d532 | 1161 | stop_all_lwps (0, NULL); |
f9e39928 | 1162 | |
ca5c370d | 1163 | #ifdef USE_THREAD_DB |
8336d594 | 1164 | thread_db_detach (process); |
ca5c370d PA |
1165 | #endif |
1166 | ||
fa593d66 PA |
1167 | /* Stabilize threads (move out of jump pads). */ |
1168 | stabilize_threads (); | |
1169 | ||
95954743 | 1170 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1171 | |
1172 | the_target->mourn (process); | |
f9e39928 PA |
1173 | |
1174 | /* Since we presently can only stop all lwps of all processes, we | |
1175 | need to unstop lwps of other processes. */ | |
7984d532 | 1176 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1177 | return 0; |
1178 | } | |
1179 | ||
1180 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1181 | ||
1182 | static int | |
1183 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1184 | { | |
d86d4aaf DE |
1185 | struct thread_info *thread = (struct thread_info *) entry; |
1186 | struct lwp_info *lwp = get_thread_lwp (thread); | |
f9e39928 PA |
1187 | struct process_info *process = proc; |
1188 | ||
d86d4aaf | 1189 | if (pid_of (thread) == pid_of (process)) |
f9e39928 PA |
1190 | delete_lwp (lwp); |
1191 | ||
dd6953e1 | 1192 | return 0; |
6ad8ae5c DJ |
1193 | } |
1194 | ||
8336d594 PA |
1195 | static void |
1196 | linux_mourn (struct process_info *process) | |
1197 | { | |
1198 | struct process_info_private *priv; | |
1199 | ||
1200 | #ifdef USE_THREAD_DB | |
1201 | thread_db_mourn (process); | |
1202 | #endif | |
1203 | ||
d86d4aaf | 1204 | find_inferior (&all_threads, delete_lwp_callback, process); |
f9e39928 | 1205 | |
8336d594 PA |
1206 | /* Freeing all private data. */ |
1207 | priv = process->private; | |
1208 | free (priv->arch_private); | |
1209 | free (priv); | |
1210 | process->private = NULL; | |
505106cd PA |
1211 | |
1212 | remove_process (process); | |
8336d594 PA |
1213 | } |
1214 | ||
444d6139 | 1215 | static void |
95954743 | 1216 | linux_join (int pid) |
444d6139 | 1217 | { |
444d6139 PA |
1218 | int status, ret; |
1219 | ||
1220 | do { | |
95954743 | 1221 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1222 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1223 | break; | |
1224 | } while (ret != -1 || errno != ECHILD); | |
1225 | } | |
1226 | ||
6ad8ae5c | 1227 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1228 | static int |
95954743 | 1229 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1230 | { |
95954743 PA |
1231 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1232 | ||
1233 | /* We assume we always know if a thread exits. If a whole process | |
1234 | exited but we still haven't been able to report it to GDB, we'll | |
1235 | hold on to the last lwp of the dead process. */ | |
1236 | if (lwp != NULL) | |
1237 | return !lwp->dead; | |
0d62e5e8 DJ |
1238 | else |
1239 | return 0; | |
1240 | } | |
1241 | ||
6bf5e0ba | 1242 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1243 | static int |
d50171e4 | 1244 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1245 | { |
d86d4aaf DE |
1246 | struct thread_info *thread = (struct thread_info *) entry; |
1247 | struct lwp_info *lwp = get_thread_lwp (thread); | |
95954743 PA |
1248 | ptid_t ptid = * (ptid_t *) arg; |
1249 | ||
1250 | /* Check if we're only interested in events from a specific process | |
1251 | or its lwps. */ | |
1252 | if (!ptid_equal (minus_one_ptid, ptid) | |
d86d4aaf | 1253 | && ptid_get_pid (ptid) != ptid_get_pid (thread->entry.id)) |
95954743 | 1254 | return 0; |
0d62e5e8 | 1255 | |
d50171e4 PA |
1256 | /* If we got a `vCont;t', but we haven't reported a stop yet, do |
1257 | report any status pending the LWP may have. */ | |
8336d594 | 1258 | if (thread->last_resume_kind == resume_stop |
7984d532 | 1259 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) |
d50171e4 | 1260 | return 0; |
0d62e5e8 | 1261 | |
d50171e4 | 1262 | return lwp->status_pending_p; |
0d62e5e8 DJ |
1263 | } |
1264 | ||
95954743 PA |
1265 | static int |
1266 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1267 | { | |
1268 | ptid_t ptid = *(ptid_t *) data; | |
1269 | int lwp; | |
1270 | ||
1271 | if (ptid_get_lwp (ptid) != 0) | |
1272 | lwp = ptid_get_lwp (ptid); | |
1273 | else | |
1274 | lwp = ptid_get_pid (ptid); | |
1275 | ||
1276 | if (ptid_get_lwp (entry->id) == lwp) | |
1277 | return 1; | |
1278 | ||
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | struct lwp_info * | |
1283 | find_lwp_pid (ptid_t ptid) | |
1284 | { | |
d86d4aaf DE |
1285 | struct inferior_list_entry *thread |
1286 | = find_inferior (&all_threads, same_lwp, &ptid); | |
1287 | ||
1288 | if (thread == NULL) | |
1289 | return NULL; | |
1290 | ||
1291 | return get_thread_lwp ((struct thread_info *) thread); | |
95954743 PA |
1292 | } |
1293 | ||
fa96cb38 | 1294 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1295 | |
fa96cb38 PA |
1296 | static int |
1297 | num_lwps (int pid) | |
1298 | { | |
1299 | struct inferior_list_entry *inf, *tmp; | |
1300 | int count = 0; | |
0d62e5e8 | 1301 | |
fa96cb38 | 1302 | ALL_INFERIORS (&all_threads, inf, tmp) |
24a09b5f | 1303 | { |
fa96cb38 PA |
1304 | if (ptid_get_pid (inf->id) == pid) |
1305 | count++; | |
24a09b5f | 1306 | } |
3aee8918 | 1307 | |
fa96cb38 PA |
1308 | return count; |
1309 | } | |
d61ddec4 | 1310 | |
fa96cb38 PA |
1311 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1312 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1313 | |
fa96cb38 PA |
1314 | static void |
1315 | check_zombie_leaders (void) | |
1316 | { | |
1317 | struct process_info *proc, *tmp; | |
c3adc08c | 1318 | |
fa96cb38 | 1319 | ALL_PROCESSES (proc, tmp) |
c3adc08c | 1320 | { |
fa96cb38 PA |
1321 | pid_t leader_pid = pid_of (proc); |
1322 | struct lwp_info *leader_lp; | |
c3adc08c | 1323 | |
fa96cb38 | 1324 | leader_lp = find_lwp_pid (pid_to_ptid (leader_pid)); |
c3adc08c | 1325 | |
fa96cb38 PA |
1326 | if (debug_threads) |
1327 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1328 | "num_lwps=%d, zombie=%d\n", | |
1329 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1330 | linux_proc_pid_is_zombie (leader_pid)); | |
1331 | ||
1332 | if (leader_lp != NULL | |
1333 | /* Check if there are other threads in the group, as we may | |
1334 | have raced with the inferior simply exiting. */ | |
1335 | && !last_thread_of_process_p (leader_pid) | |
1336 | && linux_proc_pid_is_zombie (leader_pid)) | |
1337 | { | |
1338 | /* A leader zombie can mean one of two things: | |
1339 | ||
1340 | - It exited, and there's an exit status pending | |
1341 | available, or only the leader exited (not the whole | |
1342 | program). In the latter case, we can't waitpid the | |
1343 | leader's exit status until all other threads are gone. | |
1344 | ||
1345 | - There are 3 or more threads in the group, and a thread | |
1346 | other than the leader exec'd. On an exec, the Linux | |
1347 | kernel destroys all other threads (except the execing | |
1348 | one) in the thread group, and resets the execing thread's | |
1349 | tid to the tgid. No exit notification is sent for the | |
1350 | execing thread -- from the ptracer's perspective, it | |
1351 | appears as though the execing thread just vanishes. | |
1352 | Until we reap all other threads except the leader and the | |
1353 | execing thread, the leader will be zombie, and the | |
1354 | execing thread will be in `D (disc sleep)'. As soon as | |
1355 | all other threads are reaped, the execing thread changes | |
1356 | it's tid to the tgid, and the previous (zombie) leader | |
1357 | vanishes, giving place to the "new" leader. We could try | |
1358 | distinguishing the exit and exec cases, by waiting once | |
1359 | more, and seeing if something comes out, but it doesn't | |
1360 | sound useful. The previous leader _does_ go away, and | |
1361 | we'll re-add the new one once we see the exec event | |
1362 | (which is just the same as what would happen if the | |
1363 | previous leader did exit voluntarily before some other | |
1364 | thread execs). */ | |
c3adc08c | 1365 | |
fa96cb38 PA |
1366 | if (debug_threads) |
1367 | fprintf (stderr, | |
1368 | "CZL: Thread group leader %d zombie " | |
1369 | "(it exited, or another thread execd).\n", | |
1370 | leader_pid); | |
c3adc08c | 1371 | |
fa96cb38 | 1372 | delete_lwp (leader_lp); |
c3adc08c PA |
1373 | } |
1374 | } | |
fa96cb38 | 1375 | } |
c3adc08c | 1376 | |
fa96cb38 PA |
1377 | /* Callback for `find_inferior'. Returns the first LWP that is not |
1378 | stopped. ARG is a PTID filter. */ | |
d50171e4 | 1379 | |
fa96cb38 PA |
1380 | static int |
1381 | not_stopped_callback (struct inferior_list_entry *entry, void *arg) | |
1382 | { | |
1383 | struct thread_info *thr = (struct thread_info *) entry; | |
1384 | struct lwp_info *lwp; | |
1385 | ptid_t filter = *(ptid_t *) arg; | |
47c0c975 | 1386 | |
fa96cb38 PA |
1387 | if (!ptid_match (ptid_of (thr), filter)) |
1388 | return 0; | |
bd99dc85 | 1389 | |
fa96cb38 PA |
1390 | lwp = get_thread_lwp (thr); |
1391 | if (!lwp->stopped) | |
1392 | return 1; | |
1393 | ||
1394 | return 0; | |
0d62e5e8 | 1395 | } |
611cb4a5 | 1396 | |
219f2f23 PA |
1397 | /* This function should only be called if the LWP got a SIGTRAP. |
1398 | ||
1399 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1400 | event was handled, 0 otherwise. */ | |
1401 | ||
1402 | static int | |
1403 | handle_tracepoints (struct lwp_info *lwp) | |
1404 | { | |
1405 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1406 | int tpoint_related_event = 0; | |
1407 | ||
7984d532 PA |
1408 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1409 | uninsert tracepoints. To do this, we temporarily pause all | |
1410 | threads, unpatch away, and then unpause threads. We need to make | |
1411 | sure the unpausing doesn't resume LWP too. */ | |
1412 | lwp->suspended++; | |
1413 | ||
219f2f23 PA |
1414 | /* And we need to be sure that any all-threads-stopping doesn't try |
1415 | to move threads out of the jump pads, as it could deadlock the | |
1416 | inferior (LWP could be in the jump pad, maybe even holding the | |
1417 | lock.) */ | |
1418 | ||
1419 | /* Do any necessary step collect actions. */ | |
1420 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1421 | ||
fa593d66 PA |
1422 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1423 | ||
219f2f23 PA |
1424 | /* See if we just hit a tracepoint and do its main collect |
1425 | actions. */ | |
1426 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1427 | ||
7984d532 PA |
1428 | lwp->suspended--; |
1429 | ||
1430 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1431 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1432 | |
219f2f23 PA |
1433 | if (tpoint_related_event) |
1434 | { | |
1435 | if (debug_threads) | |
87ce2a04 | 1436 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1437 | return 1; |
1438 | } | |
1439 | ||
1440 | return 0; | |
1441 | } | |
1442 | ||
fa593d66 PA |
1443 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1444 | fast tracepoint. */ | |
1445 | ||
1446 | static int | |
1447 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1448 | struct fast_tpoint_collect_status *status) | |
1449 | { | |
1450 | CORE_ADDR thread_area; | |
d86d4aaf | 1451 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1452 | |
1453 | if (the_low_target.get_thread_area == NULL) | |
1454 | return 0; | |
1455 | ||
1456 | /* Get the thread area address. This is used to recognize which | |
1457 | thread is which when tracing with the in-process agent library. | |
1458 | We don't read anything from the address, and treat it as opaque; | |
1459 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 1460 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
fa593d66 PA |
1461 | return 0; |
1462 | ||
1463 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1464 | } | |
1465 | ||
1466 | /* The reason we resume in the caller, is because we want to be able | |
1467 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1468 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1469 | refuses to resume. */ | |
1470 | ||
1471 | static int | |
1472 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1473 | { | |
1474 | struct thread_info *saved_inferior; | |
1475 | ||
1476 | saved_inferior = current_inferior; | |
1477 | current_inferior = get_lwp_thread (lwp); | |
1478 | ||
1479 | if ((wstat == NULL | |
1480 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1481 | && supports_fast_tracepoints () | |
58b4daa5 | 1482 | && agent_loaded_p ()) |
fa593d66 PA |
1483 | { |
1484 | struct fast_tpoint_collect_status status; | |
1485 | int r; | |
1486 | ||
1487 | if (debug_threads) | |
87ce2a04 DE |
1488 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1489 | "jump pad.\n", | |
d86d4aaf | 1490 | lwpid_of (current_inferior)); |
fa593d66 PA |
1491 | |
1492 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1493 | ||
1494 | if (wstat == NULL | |
1495 | || (WSTOPSIG (*wstat) != SIGILL | |
1496 | && WSTOPSIG (*wstat) != SIGFPE | |
1497 | && WSTOPSIG (*wstat) != SIGSEGV | |
1498 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1499 | { | |
1500 | lwp->collecting_fast_tracepoint = r; | |
1501 | ||
1502 | if (r != 0) | |
1503 | { | |
1504 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1505 | { | |
1506 | /* Haven't executed the original instruction yet. | |
1507 | Set breakpoint there, and wait till it's hit, | |
1508 | then single-step until exiting the jump pad. */ | |
1509 | lwp->exit_jump_pad_bkpt | |
1510 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1511 | } | |
1512 | ||
1513 | if (debug_threads) | |
87ce2a04 DE |
1514 | debug_printf ("Checking whether LWP %ld needs to move out of " |
1515 | "the jump pad...it does\n", | |
d86d4aaf | 1516 | lwpid_of (current_inferior)); |
0cccb683 | 1517 | current_inferior = saved_inferior; |
fa593d66 PA |
1518 | |
1519 | return 1; | |
1520 | } | |
1521 | } | |
1522 | else | |
1523 | { | |
1524 | /* If we get a synchronous signal while collecting, *and* | |
1525 | while executing the (relocated) original instruction, | |
1526 | reset the PC to point at the tpoint address, before | |
1527 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1528 | report the signal to GDB, and pray for the best. */ | |
1529 | ||
1530 | lwp->collecting_fast_tracepoint = 0; | |
1531 | ||
1532 | if (r != 0 | |
1533 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1534 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1535 | { | |
1536 | siginfo_t info; | |
1537 | struct regcache *regcache; | |
1538 | ||
1539 | /* The si_addr on a few signals references the address | |
1540 | of the faulting instruction. Adjust that as | |
1541 | well. */ | |
1542 | if ((WSTOPSIG (*wstat) == SIGILL | |
1543 | || WSTOPSIG (*wstat) == SIGFPE | |
1544 | || WSTOPSIG (*wstat) == SIGBUS | |
1545 | || WSTOPSIG (*wstat) == SIGSEGV) | |
d86d4aaf | 1546 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_inferior), |
b8e1b30e | 1547 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
1548 | /* Final check just to make sure we don't clobber |
1549 | the siginfo of non-kernel-sent signals. */ | |
1550 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1551 | { | |
1552 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
d86d4aaf | 1553 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_inferior), |
b8e1b30e | 1554 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
1555 | } |
1556 | ||
d86d4aaf | 1557 | regcache = get_thread_regcache (current_inferior, 1); |
fa593d66 PA |
1558 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
1559 | lwp->stop_pc = status.tpoint_addr; | |
1560 | ||
1561 | /* Cancel any fast tracepoint lock this thread was | |
1562 | holding. */ | |
1563 | force_unlock_trace_buffer (); | |
1564 | } | |
1565 | ||
1566 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1567 | { | |
1568 | if (debug_threads) | |
87ce2a04 DE |
1569 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
1570 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
1571 | |
1572 | stop_all_lwps (1, lwp); | |
1573 | cancel_breakpoints (); | |
1574 | ||
1575 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1576 | lwp->exit_jump_pad_bkpt = NULL; | |
1577 | ||
1578 | unstop_all_lwps (1, lwp); | |
1579 | ||
1580 | gdb_assert (lwp->suspended >= 0); | |
1581 | } | |
1582 | } | |
1583 | } | |
1584 | ||
1585 | if (debug_threads) | |
87ce2a04 DE |
1586 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1587 | "jump pad...no\n", | |
d86d4aaf | 1588 | lwpid_of (current_inferior)); |
0cccb683 YQ |
1589 | |
1590 | current_inferior = saved_inferior; | |
fa593d66 PA |
1591 | return 0; |
1592 | } | |
1593 | ||
1594 | /* Enqueue one signal in the "signals to report later when out of the | |
1595 | jump pad" list. */ | |
1596 | ||
1597 | static void | |
1598 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1599 | { | |
1600 | struct pending_signals *p_sig; | |
d86d4aaf | 1601 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1602 | |
1603 | if (debug_threads) | |
87ce2a04 | 1604 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 1605 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1606 | |
1607 | if (debug_threads) | |
1608 | { | |
1609 | struct pending_signals *sig; | |
1610 | ||
1611 | for (sig = lwp->pending_signals_to_report; | |
1612 | sig != NULL; | |
1613 | sig = sig->prev) | |
87ce2a04 DE |
1614 | debug_printf (" Already queued %d\n", |
1615 | sig->signal); | |
fa593d66 | 1616 | |
87ce2a04 | 1617 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
1618 | } |
1619 | ||
1a981360 PA |
1620 | /* Don't enqueue non-RT signals if they are already in the deferred |
1621 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1622 | twice) */ | |
1623 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1624 | { | |
1625 | struct pending_signals *sig; | |
1626 | ||
1627 | for (sig = lwp->pending_signals_to_report; | |
1628 | sig != NULL; | |
1629 | sig = sig->prev) | |
1630 | { | |
1631 | if (sig->signal == WSTOPSIG (*wstat)) | |
1632 | { | |
1633 | if (debug_threads) | |
87ce2a04 DE |
1634 | debug_printf ("Not requeuing already queued non-RT signal %d" |
1635 | " for LWP %ld\n", | |
1636 | sig->signal, | |
d86d4aaf | 1637 | lwpid_of (thread)); |
1a981360 PA |
1638 | return; |
1639 | } | |
1640 | } | |
1641 | } | |
1642 | ||
fa593d66 PA |
1643 | p_sig = xmalloc (sizeof (*p_sig)); |
1644 | p_sig->prev = lwp->pending_signals_to_report; | |
1645 | p_sig->signal = WSTOPSIG (*wstat); | |
1646 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
d86d4aaf | 1647 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1648 | &p_sig->info); |
fa593d66 PA |
1649 | |
1650 | lwp->pending_signals_to_report = p_sig; | |
1651 | } | |
1652 | ||
1653 | /* Dequeue one signal from the "signals to report later when out of | |
1654 | the jump pad" list. */ | |
1655 | ||
1656 | static int | |
1657 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1658 | { | |
d86d4aaf DE |
1659 | struct thread_info *thread = get_lwp_thread (lwp); |
1660 | ||
fa593d66 PA |
1661 | if (lwp->pending_signals_to_report != NULL) |
1662 | { | |
1663 | struct pending_signals **p_sig; | |
1664 | ||
1665 | p_sig = &lwp->pending_signals_to_report; | |
1666 | while ((*p_sig)->prev != NULL) | |
1667 | p_sig = &(*p_sig)->prev; | |
1668 | ||
1669 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1670 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 1671 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1672 | &(*p_sig)->info); |
fa593d66 PA |
1673 | free (*p_sig); |
1674 | *p_sig = NULL; | |
1675 | ||
1676 | if (debug_threads) | |
87ce2a04 | 1677 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 1678 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1679 | |
1680 | if (debug_threads) | |
1681 | { | |
1682 | struct pending_signals *sig; | |
1683 | ||
1684 | for (sig = lwp->pending_signals_to_report; | |
1685 | sig != NULL; | |
1686 | sig = sig->prev) | |
87ce2a04 DE |
1687 | debug_printf (" Still queued %d\n", |
1688 | sig->signal); | |
fa593d66 | 1689 | |
87ce2a04 | 1690 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
1691 | } |
1692 | ||
1693 | return 1; | |
1694 | } | |
1695 | ||
1696 | return 0; | |
1697 | } | |
1698 | ||
d50171e4 PA |
1699 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1700 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1701 | will handle the current event, eventually we will resume this LWP, | |
1702 | and this breakpoint will trap again. */ | |
1703 | ||
1704 | static int | |
1705 | cancel_breakpoint (struct lwp_info *lwp) | |
1706 | { | |
1707 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1708 | |
1709 | /* There's nothing to do if we don't support breakpoints. */ | |
1710 | if (!supports_breakpoints ()) | |
1711 | return 0; | |
1712 | ||
d50171e4 PA |
1713 | /* breakpoint_at reads from current inferior. */ |
1714 | saved_inferior = current_inferior; | |
1715 | current_inferior = get_lwp_thread (lwp); | |
1716 | ||
1717 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1718 | { | |
1719 | if (debug_threads) | |
87ce2a04 | 1720 | debug_printf ("CB: Push back breakpoint for %s\n", |
d86d4aaf | 1721 | target_pid_to_str (ptid_of (current_inferior))); |
d50171e4 PA |
1722 | |
1723 | /* Back up the PC if necessary. */ | |
1724 | if (the_low_target.decr_pc_after_break) | |
1725 | { | |
1726 | struct regcache *regcache | |
fc7238bb | 1727 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1728 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1729 | } | |
1730 | ||
1731 | current_inferior = saved_inferior; | |
1732 | return 1; | |
1733 | } | |
1734 | else | |
1735 | { | |
1736 | if (debug_threads) | |
87ce2a04 DE |
1737 | debug_printf ("CB: No breakpoint found at %s for [%s]\n", |
1738 | paddress (lwp->stop_pc), | |
d86d4aaf | 1739 | target_pid_to_str (ptid_of (current_inferior))); |
d50171e4 PA |
1740 | } |
1741 | ||
1742 | current_inferior = saved_inferior; | |
1743 | return 0; | |
1744 | } | |
1745 | ||
fa96cb38 PA |
1746 | /* Do low-level handling of the event, and check if we should go on |
1747 | and pass it to caller code. Return the affected lwp if we are, or | |
1748 | NULL otherwise. */ | |
1749 | ||
1750 | static struct lwp_info * | |
1751 | linux_low_filter_event (ptid_t filter_ptid, int lwpid, int wstat) | |
1752 | { | |
1753 | struct lwp_info *child; | |
1754 | struct thread_info *thread; | |
1755 | ||
1756 | child = find_lwp_pid (pid_to_ptid (lwpid)); | |
1757 | ||
1758 | /* If we didn't find a process, one of two things presumably happened: | |
1759 | - A process we started and then detached from has exited. Ignore it. | |
1760 | - A process we are controlling has forked and the new child's stop | |
1761 | was reported to us by the kernel. Save its PID. */ | |
1762 | if (child == NULL && WIFSTOPPED (wstat)) | |
1763 | { | |
1764 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
1765 | return NULL; | |
1766 | } | |
1767 | else if (child == NULL) | |
1768 | return NULL; | |
1769 | ||
1770 | thread = get_lwp_thread (child); | |
1771 | ||
1772 | child->stopped = 1; | |
1773 | ||
1774 | child->last_status = wstat; | |
1775 | ||
1776 | if (WIFSTOPPED (wstat)) | |
1777 | { | |
1778 | struct process_info *proc; | |
1779 | ||
1780 | /* Architecture-specific setup after inferior is running. This | |
1781 | needs to happen after we have attached to the inferior and it | |
1782 | is stopped for the first time, but before we access any | |
1783 | inferior registers. */ | |
1784 | proc = find_process_pid (pid_of (thread)); | |
1785 | if (proc->private->new_inferior) | |
1786 | { | |
1787 | struct thread_info *saved_inferior; | |
1788 | ||
1789 | saved_inferior = current_inferior; | |
1790 | current_inferior = thread; | |
1791 | ||
1792 | the_low_target.arch_setup (); | |
1793 | ||
1794 | current_inferior = saved_inferior; | |
1795 | ||
1796 | proc->private->new_inferior = 0; | |
1797 | } | |
1798 | } | |
1799 | ||
1800 | /* Store the STOP_PC, with adjustment applied. This depends on the | |
1801 | architecture being defined already (so that CHILD has a valid | |
1802 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1803 | not). */ | |
1804 | if (WIFSTOPPED (wstat)) | |
1805 | { | |
1806 | if (debug_threads | |
1807 | && the_low_target.get_pc != NULL) | |
1808 | { | |
1809 | struct thread_info *saved_inferior; | |
1810 | struct regcache *regcache; | |
1811 | CORE_ADDR pc; | |
1812 | ||
1813 | saved_inferior = current_inferior; | |
1814 | current_inferior = thread; | |
1815 | regcache = get_thread_regcache (current_inferior, 1); | |
1816 | pc = (*the_low_target.get_pc) (regcache); | |
1817 | debug_printf ("linux_low_filter_event: pc is 0x%lx\n", (long) pc); | |
1818 | current_inferior = saved_inferior; | |
1819 | } | |
1820 | ||
1821 | child->stop_pc = get_stop_pc (child); | |
1822 | } | |
1823 | ||
1824 | /* Fetch the possibly triggered data watchpoint info and store it in | |
1825 | CHILD. | |
1826 | ||
1827 | On some archs, like x86, that use debug registers to set | |
1828 | watchpoints, it's possible that the way to know which watched | |
1829 | address trapped, is to check the register that is used to select | |
1830 | which address to watch. Problem is, between setting the | |
1831 | watchpoint and reading back which data address trapped, the user | |
1832 | may change the set of watchpoints, and, as a consequence, GDB | |
1833 | changes the debug registers in the inferior. To avoid reading | |
1834 | back a stale stopped-data-address when that happens, we cache in | |
1835 | LP the fact that a watchpoint trapped, and the corresponding data | |
1836 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1837 | changes the debug registers meanwhile, we have the cached data we | |
1838 | can rely on. */ | |
1839 | ||
1840 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP) | |
1841 | { | |
1842 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1843 | { | |
1844 | child->stopped_by_watchpoint = 0; | |
1845 | } | |
1846 | else | |
1847 | { | |
1848 | struct thread_info *saved_inferior; | |
1849 | ||
1850 | saved_inferior = current_inferior; | |
1851 | current_inferior = thread; | |
1852 | ||
1853 | child->stopped_by_watchpoint | |
1854 | = the_low_target.stopped_by_watchpoint (); | |
1855 | ||
1856 | if (child->stopped_by_watchpoint) | |
1857 | { | |
1858 | if (the_low_target.stopped_data_address != NULL) | |
1859 | child->stopped_data_address | |
1860 | = the_low_target.stopped_data_address (); | |
1861 | else | |
1862 | child->stopped_data_address = 0; | |
1863 | } | |
1864 | ||
1865 | current_inferior = saved_inferior; | |
1866 | } | |
1867 | } | |
1868 | ||
1869 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) | |
1870 | { | |
1871 | linux_enable_event_reporting (lwpid); | |
1872 | child->must_set_ptrace_flags = 0; | |
1873 | } | |
1874 | ||
1875 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP | |
1876 | && wstat >> 16 != 0) | |
1877 | { | |
1878 | handle_extended_wait (child, wstat); | |
1879 | return NULL; | |
1880 | } | |
1881 | ||
1882 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP | |
1883 | && child->stop_expected) | |
1884 | { | |
1885 | if (debug_threads) | |
1886 | debug_printf ("Expected stop.\n"); | |
1887 | child->stop_expected = 0; | |
1888 | ||
1889 | if (thread->last_resume_kind == resume_stop) | |
1890 | { | |
1891 | /* We want to report the stop to the core. Treat the | |
1892 | SIGSTOP as a normal event. */ | |
1893 | } | |
1894 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
1895 | { | |
1896 | /* Stopping threads. We don't want this SIGSTOP to end up | |
1897 | pending in the FILTER_PTID handling below. */ | |
1898 | return NULL; | |
1899 | } | |
1900 | else | |
1901 | { | |
1902 | /* Filter out the event. */ | |
1903 | linux_resume_one_lwp (child, child->stepping, 0, NULL); | |
1904 | return NULL; | |
1905 | } | |
1906 | } | |
1907 | ||
1908 | /* Check if the thread has exited. */ | |
1909 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat)) | |
1910 | && num_lwps (pid_of (thread)) > 1) | |
1911 | { | |
1912 | if (debug_threads) | |
1913 | debug_printf ("LLW: %d exited.\n", lwpid); | |
1914 | ||
1915 | /* If there is at least one more LWP, then the exit signal | |
1916 | was not the end of the debugged application and should be | |
1917 | ignored. */ | |
1918 | delete_lwp (child); | |
1919 | return NULL; | |
1920 | } | |
1921 | ||
1922 | if (!ptid_match (ptid_of (thread), filter_ptid)) | |
1923 | { | |
1924 | if (debug_threads) | |
1925 | debug_printf ("LWP %d got an event %06x, leaving pending.\n", | |
1926 | lwpid, wstat); | |
1927 | ||
1928 | if (WIFSTOPPED (wstat)) | |
1929 | { | |
1930 | child->status_pending_p = 1; | |
1931 | child->status_pending = wstat; | |
1932 | ||
1933 | if (WSTOPSIG (wstat) != SIGSTOP) | |
1934 | { | |
1935 | /* Cancel breakpoint hits. The breakpoint may be | |
1936 | removed before we fetch events from this process to | |
1937 | report to the core. It is best not to assume the | |
1938 | moribund breakpoints heuristic always handles these | |
1939 | cases --- it could be too many events go through to | |
1940 | the core before this one is handled. All-stop always | |
1941 | cancels breakpoint hits in all threads. */ | |
1942 | if (non_stop | |
1943 | && WSTOPSIG (wstat) == SIGTRAP | |
1944 | && cancel_breakpoint (child)) | |
1945 | { | |
1946 | /* Throw away the SIGTRAP. */ | |
1947 | child->status_pending_p = 0; | |
1948 | ||
1949 | if (debug_threads) | |
1950 | debug_printf ("LLW: LWP %d hit a breakpoint while" | |
1951 | " waiting for another process;" | |
1952 | " cancelled it\n", lwpid); | |
1953 | } | |
1954 | } | |
1955 | } | |
1956 | else if (WIFEXITED (wstat) || WIFSIGNALED (wstat)) | |
1957 | { | |
1958 | if (debug_threads) | |
1959 | debug_printf ("LLWE: process %d exited while fetching " | |
1960 | "event from another LWP\n", lwpid); | |
1961 | ||
1962 | /* This was the last lwp in the process. Since events are | |
1963 | serialized to GDB core, and we can't report this one | |
1964 | right now, but GDB core and the other target layers will | |
1965 | want to be notified about the exit code/signal, leave the | |
1966 | status pending for the next time we're able to report | |
1967 | it. */ | |
1968 | mark_lwp_dead (child, wstat); | |
1969 | } | |
1970 | ||
1971 | return NULL; | |
1972 | } | |
1973 | ||
1974 | return child; | |
1975 | } | |
1976 | ||
d50171e4 PA |
1977 | /* When the event-loop is doing a step-over, this points at the thread |
1978 | being stepped. */ | |
1979 | ptid_t step_over_bkpt; | |
1980 | ||
fa96cb38 PA |
1981 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
1982 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
1983 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
1984 | lwps of a thread group; or a PTID representing a single lwp. Store | |
1985 | the stop status through the status pointer WSTAT. OPTIONS is | |
1986 | passed to the waitpid call. Return 0 if no event was found and | |
1987 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
1988 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 1989 | |
0d62e5e8 | 1990 | static int |
fa96cb38 PA |
1991 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
1992 | int *wstatp, int options) | |
0d62e5e8 | 1993 | { |
d86d4aaf | 1994 | struct thread_info *event_thread; |
d50171e4 | 1995 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 1996 | sigset_t block_mask, prev_mask; |
d50171e4 | 1997 | |
fa96cb38 | 1998 | retry: |
d86d4aaf DE |
1999 | /* N.B. event_thread points to the thread_info struct that contains |
2000 | event_child. Keep them in sync. */ | |
2001 | event_thread = NULL; | |
d50171e4 PA |
2002 | event_child = NULL; |
2003 | requested_child = NULL; | |
0d62e5e8 | 2004 | |
95954743 | 2005 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2006 | |
fa96cb38 | 2007 | if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid)) |
0d62e5e8 | 2008 | { |
d86d4aaf | 2009 | event_thread = (struct thread_info *) |
fa96cb38 | 2010 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); |
d86d4aaf DE |
2011 | if (event_thread != NULL) |
2012 | event_child = get_thread_lwp (event_thread); | |
2013 | if (debug_threads && event_thread) | |
2014 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2015 | } |
fa96cb38 | 2016 | else if (!ptid_equal (filter_ptid, null_ptid)) |
0d62e5e8 | 2017 | { |
fa96cb38 | 2018 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2019 | |
bde24c0a | 2020 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
2021 | && requested_child->status_pending_p |
2022 | && requested_child->collecting_fast_tracepoint) | |
2023 | { | |
2024 | enqueue_one_deferred_signal (requested_child, | |
2025 | &requested_child->status_pending); | |
2026 | requested_child->status_pending_p = 0; | |
2027 | requested_child->status_pending = 0; | |
2028 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2029 | } | |
2030 | ||
2031 | if (requested_child->suspended | |
2032 | && requested_child->status_pending_p) | |
2033 | fatal ("requesting an event out of a suspended child?"); | |
2034 | ||
d50171e4 | 2035 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2036 | { |
2037 | event_child = requested_child; | |
2038 | event_thread = get_lwp_thread (event_child); | |
2039 | } | |
0d62e5e8 | 2040 | } |
611cb4a5 | 2041 | |
0d62e5e8 DJ |
2042 | if (event_child != NULL) |
2043 | { | |
bd99dc85 | 2044 | if (debug_threads) |
87ce2a04 | 2045 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2046 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2047 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2048 | event_child->status_pending_p = 0; |
2049 | event_child->status_pending = 0; | |
d86d4aaf DE |
2050 | current_inferior = event_thread; |
2051 | return lwpid_of (event_thread); | |
0d62e5e8 DJ |
2052 | } |
2053 | ||
fa96cb38 PA |
2054 | /* But if we don't find a pending event, we'll have to wait. |
2055 | ||
2056 | We only enter this loop if no process has a pending wait status. | |
2057 | Thus any action taken in response to a wait status inside this | |
2058 | loop is responding as soon as we detect the status, not after any | |
2059 | pending events. */ | |
d8301ad1 | 2060 | |
fa96cb38 PA |
2061 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2062 | all signals while here. */ | |
2063 | sigfillset (&block_mask); | |
2064 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2065 | ||
2066 | while (event_child == NULL) | |
0d62e5e8 | 2067 | { |
fa96cb38 | 2068 | pid_t ret = 0; |
0d62e5e8 | 2069 | |
fa96cb38 PA |
2070 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2071 | quirks: | |
0d62e5e8 | 2072 | |
fa96cb38 PA |
2073 | - If the thread group leader exits while other threads in the |
2074 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2075 | waitpid won't return an exit status until the other threads | |
2076 | in the group are reaped. | |
611cb4a5 | 2077 | |
fa96cb38 PA |
2078 | - When a non-leader thread execs, that thread just vanishes |
2079 | without reporting an exit (so we'd hang if we waited for it | |
2080 | explicitly in that case). The exec event is reported to | |
2081 | the TGID pid (although we don't currently enable exec | |
2082 | events). */ | |
2083 | errno = 0; | |
2084 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2085 | |
fa96cb38 PA |
2086 | if (debug_threads) |
2087 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2088 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2089 | |
fa96cb38 | 2090 | if (ret > 0) |
0d62e5e8 | 2091 | { |
89be2091 | 2092 | if (debug_threads) |
bd99dc85 | 2093 | { |
fa96cb38 PA |
2094 | debug_printf ("LLW: waitpid %ld received %s\n", |
2095 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2096 | } |
89be2091 | 2097 | |
fa96cb38 PA |
2098 | event_child = linux_low_filter_event (filter_ptid, |
2099 | ret, *wstatp); | |
2100 | if (event_child != NULL) | |
bd99dc85 | 2101 | { |
fa96cb38 PA |
2102 | /* We got an event to report to the core. */ |
2103 | event_thread = get_lwp_thread (event_child); | |
2104 | break; | |
bd99dc85 | 2105 | } |
89be2091 | 2106 | |
fa96cb38 PA |
2107 | /* Retry until nothing comes out of waitpid. A single |
2108 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2109 | continue; |
2110 | } | |
2111 | ||
fa96cb38 PA |
2112 | /* Check for zombie thread group leaders. Those can't be reaped |
2113 | until all other threads in the thread group are. */ | |
2114 | check_zombie_leaders (); | |
2115 | ||
2116 | /* If there are no resumed children left in the set of LWPs we | |
2117 | want to wait for, bail. We can't just block in | |
2118 | waitpid/sigsuspend, because lwps might have been left stopped | |
2119 | in trace-stop state, and we'd be stuck forever waiting for | |
2120 | their status to change (which would only happen if we resumed | |
2121 | them). Even if WNOHANG is set, this return code is preferred | |
2122 | over 0 (below), as it is more detailed. */ | |
2123 | if ((find_inferior (&all_threads, | |
2124 | not_stopped_callback, | |
2125 | &wait_ptid) == NULL)) | |
a6dbe5df | 2126 | { |
fa96cb38 PA |
2127 | if (debug_threads) |
2128 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2129 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2130 | return -1; | |
a6dbe5df PA |
2131 | } |
2132 | ||
fa96cb38 PA |
2133 | /* No interesting event to report to the caller. */ |
2134 | if ((options & WNOHANG)) | |
24a09b5f | 2135 | { |
fa96cb38 PA |
2136 | if (debug_threads) |
2137 | debug_printf ("WNOHANG set, no event found\n"); | |
2138 | ||
2139 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2140 | return 0; | |
24a09b5f DJ |
2141 | } |
2142 | ||
fa96cb38 PA |
2143 | /* Block until we get an event reported with SIGCHLD. */ |
2144 | if (debug_threads) | |
2145 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2146 | |
fa96cb38 PA |
2147 | sigsuspend (&prev_mask); |
2148 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2149 | goto retry; | |
2150 | } | |
d50171e4 | 2151 | |
fa96cb38 | 2152 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2153 | |
fa96cb38 | 2154 | current_inferior = event_thread; |
d50171e4 | 2155 | |
fa96cb38 PA |
2156 | /* Check for thread exit. */ |
2157 | if (! WIFSTOPPED (*wstatp)) | |
2158 | { | |
2159 | gdb_assert (last_thread_of_process_p (pid_of (event_thread))); | |
2160 | ||
2161 | if (debug_threads) | |
2162 | debug_printf ("LWP %d is the last lwp of process. " | |
2163 | "Process %ld exiting.\n", | |
2164 | pid_of (event_thread), lwpid_of (event_thread)); | |
d86d4aaf | 2165 | return lwpid_of (event_thread); |
611cb4a5 | 2166 | } |
0d62e5e8 | 2167 | |
fa96cb38 PA |
2168 | return lwpid_of (event_thread); |
2169 | } | |
2170 | ||
2171 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2172 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2173 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2174 | the stop status through the status pointer WSTAT. OPTIONS is | |
2175 | passed to the waitpid call. Return 0 if no event was found and | |
2176 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2177 | was found. Return the PID of the stopped child otherwise. */ | |
2178 | ||
2179 | static int | |
2180 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2181 | { | |
2182 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2183 | } |
2184 | ||
6bf5e0ba PA |
2185 | /* Count the LWP's that have had events. */ |
2186 | ||
2187 | static int | |
2188 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2189 | { | |
d86d4aaf DE |
2190 | struct thread_info *thread = (struct thread_info *) entry; |
2191 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba PA |
2192 | int *count = data; |
2193 | ||
2194 | gdb_assert (count != NULL); | |
2195 | ||
2196 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
2197 | should be reported to GDB. */ | |
8336d594 PA |
2198 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2199 | && thread->last_resume_kind != resume_stop | |
6bf5e0ba PA |
2200 | && lp->status_pending_p |
2201 | && WIFSTOPPED (lp->status_pending) | |
2202 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
2203 | && !breakpoint_inserted_here (lp->stop_pc)) | |
2204 | (*count)++; | |
2205 | ||
2206 | return 0; | |
2207 | } | |
2208 | ||
2209 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2210 | ||
2211 | static int | |
2212 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2213 | { | |
d86d4aaf DE |
2214 | struct thread_info *thread = (struct thread_info *) entry; |
2215 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba | 2216 | |
8336d594 PA |
2217 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2218 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2219 | && lp->status_pending_p) |
2220 | return 1; | |
2221 | else | |
2222 | return 0; | |
2223 | } | |
2224 | ||
2225 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
2226 | reported to GDB. */ | |
2227 | ||
2228 | static int | |
2229 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2230 | { | |
d86d4aaf DE |
2231 | struct thread_info *thread = (struct thread_info *) entry; |
2232 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba PA |
2233 | int *selector = data; |
2234 | ||
2235 | gdb_assert (selector != NULL); | |
2236 | ||
2237 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
2238 | if (thread->last_resume_kind != resume_stop |
2239 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2240 | && lp->status_pending_p |
2241 | && WIFSTOPPED (lp->status_pending) | |
2242 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
2243 | && !breakpoint_inserted_here (lp->stop_pc)) | |
2244 | if ((*selector)-- == 0) | |
2245 | return 1; | |
2246 | ||
2247 | return 0; | |
2248 | } | |
2249 | ||
2250 | static int | |
2251 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
2252 | { | |
d86d4aaf DE |
2253 | struct thread_info *thread = (struct thread_info *) entry; |
2254 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba PA |
2255 | struct lwp_info *event_lp = data; |
2256 | ||
2257 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2258 | if (lp == event_lp) | |
2259 | return 0; | |
2260 | ||
2261 | /* If a LWP other than the LWP that we're reporting an event for has | |
2262 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2263 | then just arrange for it to hit it again later. We don't keep | |
2264 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2265 | LWP. We will handle the current event, eventually we will resume | |
2266 | all LWPs, and this one will get its breakpoint trap again. | |
2267 | ||
2268 | If we do not do this, then we run the risk that the user will | |
2269 | delete or disable the breakpoint, but the LWP will have already | |
2270 | tripped on it. */ | |
2271 | ||
8336d594 PA |
2272 | if (thread->last_resume_kind != resume_stop |
2273 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2274 | && lp->status_pending_p |
2275 | && WIFSTOPPED (lp->status_pending) | |
2276 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
2277 | && !lp->stepping |
2278 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
2279 | && cancel_breakpoint (lp)) |
2280 | /* Throw away the SIGTRAP. */ | |
2281 | lp->status_pending_p = 0; | |
2282 | ||
2283 | return 0; | |
2284 | } | |
2285 | ||
7984d532 PA |
2286 | static void |
2287 | linux_cancel_breakpoints (void) | |
2288 | { | |
d86d4aaf | 2289 | find_inferior (&all_threads, cancel_breakpoints_callback, NULL); |
7984d532 PA |
2290 | } |
2291 | ||
6bf5e0ba PA |
2292 | /* Select one LWP out of those that have events pending. */ |
2293 | ||
2294 | static void | |
2295 | select_event_lwp (struct lwp_info **orig_lp) | |
2296 | { | |
2297 | int num_events = 0; | |
2298 | int random_selector; | |
d86d4aaf | 2299 | struct thread_info *event_thread; |
6bf5e0ba PA |
2300 | |
2301 | /* Give preference to any LWP that is being single-stepped. */ | |
d86d4aaf DE |
2302 | event_thread |
2303 | = (struct thread_info *) find_inferior (&all_threads, | |
2304 | select_singlestep_lwp_callback, | |
2305 | NULL); | |
2306 | if (event_thread != NULL) | |
6bf5e0ba PA |
2307 | { |
2308 | if (debug_threads) | |
87ce2a04 | 2309 | debug_printf ("SEL: Select single-step %s\n", |
d86d4aaf | 2310 | target_pid_to_str (ptid_of (event_thread))); |
6bf5e0ba PA |
2311 | } |
2312 | else | |
2313 | { | |
2314 | /* No single-stepping LWP. Select one at random, out of those | |
2315 | which have had SIGTRAP events. */ | |
2316 | ||
2317 | /* First see how many SIGTRAP events we have. */ | |
d86d4aaf | 2318 | find_inferior (&all_threads, count_events_callback, &num_events); |
6bf5e0ba PA |
2319 | |
2320 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2321 | random_selector = (int) | |
2322 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2323 | ||
2324 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2325 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2326 | num_events, random_selector); | |
6bf5e0ba | 2327 | |
d86d4aaf DE |
2328 | event_thread |
2329 | = (struct thread_info *) find_inferior (&all_threads, | |
2330 | select_event_lwp_callback, | |
2331 | &random_selector); | |
6bf5e0ba PA |
2332 | } |
2333 | ||
d86d4aaf | 2334 | if (event_thread != NULL) |
6bf5e0ba | 2335 | { |
d86d4aaf DE |
2336 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2337 | ||
6bf5e0ba PA |
2338 | /* Switch the event LWP. */ |
2339 | *orig_lp = event_lp; | |
2340 | } | |
2341 | } | |
2342 | ||
7984d532 PA |
2343 | /* Decrement the suspend count of an LWP. */ |
2344 | ||
2345 | static int | |
2346 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2347 | { | |
d86d4aaf DE |
2348 | struct thread_info *thread = (struct thread_info *) entry; |
2349 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
2350 | |
2351 | /* Ignore EXCEPT. */ | |
2352 | if (lwp == except) | |
2353 | return 0; | |
2354 | ||
2355 | lwp->suspended--; | |
2356 | ||
2357 | gdb_assert (lwp->suspended >= 0); | |
2358 | return 0; | |
2359 | } | |
2360 | ||
2361 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2362 | NULL. */ | |
2363 | ||
2364 | static void | |
2365 | unsuspend_all_lwps (struct lwp_info *except) | |
2366 | { | |
d86d4aaf | 2367 | find_inferior (&all_threads, unsuspend_one_lwp, except); |
7984d532 PA |
2368 | } |
2369 | ||
fa593d66 PA |
2370 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2371 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2372 | void *data); | |
2373 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2374 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2375 | struct target_waitstatus *ourstatus, | |
2376 | int target_options); | |
2377 | ||
2378 | /* Stabilize threads (move out of jump pads). | |
2379 | ||
2380 | If a thread is midway collecting a fast tracepoint, we need to | |
2381 | finish the collection and move it out of the jump pad before | |
2382 | reporting the signal. | |
2383 | ||
2384 | This avoids recursion while collecting (when a signal arrives | |
2385 | midway, and the signal handler itself collects), which would trash | |
2386 | the trace buffer. In case the user set a breakpoint in a signal | |
2387 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2388 | Most importantly, there are certain things we can't do safely if | |
2389 | threads are stopped in a jump pad (or in its callee's). For | |
2390 | example: | |
2391 | ||
2392 | - starting a new trace run. A thread still collecting the | |
2393 | previous run, could trash the trace buffer when resumed. The trace | |
2394 | buffer control structures would have been reset but the thread had | |
2395 | no way to tell. The thread could even midway memcpy'ing to the | |
2396 | buffer, which would mean that when resumed, it would clobber the | |
2397 | trace buffer that had been set for a new run. | |
2398 | ||
2399 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2400 | safely. Say you do tstart while a thread is stopped midway while | |
2401 | collecting. When the thread is later resumed, it finishes the | |
2402 | collection, and returns to the jump pad, to execute the original | |
2403 | instruction that was under the tracepoint jump at the time the | |
2404 | older run had been started. If the jump pad had been rewritten | |
2405 | since for something else in the new run, the thread would now | |
2406 | execute the wrong / random instructions. */ | |
2407 | ||
2408 | static void | |
2409 | linux_stabilize_threads (void) | |
2410 | { | |
2411 | struct thread_info *save_inferior; | |
d86d4aaf | 2412 | struct thread_info *thread_stuck; |
fa593d66 | 2413 | |
d86d4aaf DE |
2414 | thread_stuck |
2415 | = (struct thread_info *) find_inferior (&all_threads, | |
2416 | stuck_in_jump_pad_callback, | |
2417 | NULL); | |
2418 | if (thread_stuck != NULL) | |
fa593d66 | 2419 | { |
b4d51a55 | 2420 | if (debug_threads) |
87ce2a04 | 2421 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2422 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2423 | return; |
2424 | } | |
2425 | ||
2426 | save_inferior = current_inferior; | |
2427 | ||
2428 | stabilizing_threads = 1; | |
2429 | ||
2430 | /* Kick 'em all. */ | |
d86d4aaf | 2431 | for_each_inferior (&all_threads, move_out_of_jump_pad_callback); |
fa593d66 PA |
2432 | |
2433 | /* Loop until all are stopped out of the jump pads. */ | |
d86d4aaf | 2434 | while (find_inferior (&all_threads, lwp_running, NULL) != NULL) |
fa593d66 PA |
2435 | { |
2436 | struct target_waitstatus ourstatus; | |
2437 | struct lwp_info *lwp; | |
fa593d66 PA |
2438 | int wstat; |
2439 | ||
2440 | /* Note that we go through the full wait even loop. While | |
2441 | moving threads out of jump pad, we need to be able to step | |
2442 | over internal breakpoints and such. */ | |
32fcada3 | 2443 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2444 | |
2445 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2446 | { | |
2447 | lwp = get_thread_lwp (current_inferior); | |
2448 | ||
2449 | /* Lock it. */ | |
2450 | lwp->suspended++; | |
2451 | ||
a493e3e2 | 2452 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
fa593d66 PA |
2453 | || current_inferior->last_resume_kind == resume_stop) |
2454 | { | |
2ea28649 | 2455 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2456 | enqueue_one_deferred_signal (lwp, &wstat); |
2457 | } | |
2458 | } | |
2459 | } | |
2460 | ||
d86d4aaf | 2461 | find_inferior (&all_threads, unsuspend_one_lwp, NULL); |
fa593d66 PA |
2462 | |
2463 | stabilizing_threads = 0; | |
2464 | ||
2465 | current_inferior = save_inferior; | |
2466 | ||
b4d51a55 | 2467 | if (debug_threads) |
fa593d66 | 2468 | { |
d86d4aaf DE |
2469 | thread_stuck |
2470 | = (struct thread_info *) find_inferior (&all_threads, | |
2471 | stuck_in_jump_pad_callback, | |
2472 | NULL); | |
2473 | if (thread_stuck != NULL) | |
87ce2a04 | 2474 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2475 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2476 | } |
2477 | } | |
2478 | ||
0d62e5e8 | 2479 | /* Wait for process, returns status. */ |
da6d8c04 | 2480 | |
95954743 PA |
2481 | static ptid_t |
2482 | linux_wait_1 (ptid_t ptid, | |
2483 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2484 | { |
e5f1222d | 2485 | int w; |
fc7238bb | 2486 | struct lwp_info *event_child; |
bd99dc85 | 2487 | int options; |
bd99dc85 | 2488 | int pid; |
6bf5e0ba PA |
2489 | int step_over_finished; |
2490 | int bp_explains_trap; | |
2491 | int maybe_internal_trap; | |
2492 | int report_to_gdb; | |
219f2f23 | 2493 | int trace_event; |
c2d6af84 | 2494 | int in_step_range; |
bd99dc85 | 2495 | |
87ce2a04 DE |
2496 | if (debug_threads) |
2497 | { | |
2498 | debug_enter (); | |
2499 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
2500 | } | |
2501 | ||
bd99dc85 PA |
2502 | /* Translate generic target options into linux options. */ |
2503 | options = __WALL; | |
2504 | if (target_options & TARGET_WNOHANG) | |
2505 | options |= WNOHANG; | |
0d62e5e8 DJ |
2506 | |
2507 | retry: | |
fa593d66 PA |
2508 | bp_explains_trap = 0; |
2509 | trace_event = 0; | |
c2d6af84 | 2510 | in_step_range = 0; |
bd99dc85 PA |
2511 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2512 | ||
0d62e5e8 DJ |
2513 | /* If we were only supposed to resume one thread, only wait for |
2514 | that thread - if it's still alive. If it died, however - which | |
2515 | can happen if we're coming from the thread death case below - | |
2516 | then we need to make sure we restart the other threads. We could | |
2517 | pick a thread at random or restart all; restarting all is less | |
2518 | arbitrary. */ | |
95954743 PA |
2519 | if (!non_stop |
2520 | && !ptid_equal (cont_thread, null_ptid) | |
2521 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 2522 | { |
fc7238bb PA |
2523 | struct thread_info *thread; |
2524 | ||
bd99dc85 PA |
2525 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
2526 | cont_thread); | |
0d62e5e8 DJ |
2527 | |
2528 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 2529 | if (thread == NULL) |
64386c31 DJ |
2530 | { |
2531 | struct thread_resume resume_info; | |
95954743 | 2532 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
2533 | resume_info.kind = resume_continue; |
2534 | resume_info.sig = 0; | |
2bd7c093 | 2535 | linux_resume (&resume_info, 1); |
64386c31 | 2536 | } |
bd99dc85 | 2537 | else |
95954743 | 2538 | ptid = cont_thread; |
0d62e5e8 | 2539 | } |
da6d8c04 | 2540 | |
6bf5e0ba PA |
2541 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2542 | pid = linux_wait_for_event (ptid, &w, options); | |
2543 | else | |
2544 | { | |
2545 | if (debug_threads) | |
87ce2a04 DE |
2546 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
2547 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
2548 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
2549 | } | |
2550 | ||
fa96cb38 | 2551 | if (pid == 0) |
87ce2a04 | 2552 | { |
fa96cb38 PA |
2553 | gdb_assert (target_options & TARGET_WNOHANG); |
2554 | ||
87ce2a04 DE |
2555 | if (debug_threads) |
2556 | { | |
fa96cb38 PA |
2557 | debug_printf ("linux_wait_1 ret = null_ptid, " |
2558 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
2559 | debug_exit (); |
2560 | } | |
fa96cb38 PA |
2561 | |
2562 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
2563 | return null_ptid; |
2564 | } | |
fa96cb38 PA |
2565 | else if (pid == -1) |
2566 | { | |
2567 | if (debug_threads) | |
2568 | { | |
2569 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
2570 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
2571 | debug_exit (); | |
2572 | } | |
bd99dc85 | 2573 | |
fa96cb38 PA |
2574 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
2575 | return null_ptid; | |
2576 | } | |
0d62e5e8 | 2577 | |
fa96cb38 | 2578 | event_child = get_thread_lwp (current_inferior); |
0d62e5e8 | 2579 | |
fa96cb38 PA |
2580 | /* linux_wait_for_event only returns an exit status for the last |
2581 | child of a process. Report it. */ | |
2582 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 2583 | { |
fa96cb38 | 2584 | if (WIFEXITED (w)) |
0d62e5e8 | 2585 | { |
fa96cb38 PA |
2586 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
2587 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 2588 | |
fa96cb38 | 2589 | if (debug_threads) |
bd99dc85 | 2590 | { |
fa96cb38 PA |
2591 | debug_printf ("linux_wait_1 ret = %s, exited with " |
2592 | "retcode %d\n", | |
2593 | target_pid_to_str (ptid_of (current_inferior)), | |
2594 | WEXITSTATUS (w)); | |
2595 | debug_exit (); | |
bd99dc85 | 2596 | } |
fa96cb38 PA |
2597 | } |
2598 | else | |
2599 | { | |
2600 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2601 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 2602 | |
fa96cb38 PA |
2603 | if (debug_threads) |
2604 | { | |
2605 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
2606 | "signal %d\n", | |
2607 | target_pid_to_str (ptid_of (current_inferior)), | |
2608 | WTERMSIG (w)); | |
2609 | debug_exit (); | |
2610 | } | |
0d62e5e8 | 2611 | } |
fa96cb38 PA |
2612 | |
2613 | return ptid_of (current_inferior); | |
da6d8c04 DJ |
2614 | } |
2615 | ||
6bf5e0ba PA |
2616 | /* If this event was not handled before, and is not a SIGTRAP, we |
2617 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2618 | a breakpoint is inserted at the current PC. If this target does | |
2619 | not support internal breakpoints at all, we also report the | |
2620 | SIGTRAP without further processing; it's of no concern to us. */ | |
2621 | maybe_internal_trap | |
2622 | = (supports_breakpoints () | |
2623 | && (WSTOPSIG (w) == SIGTRAP | |
2624 | || ((WSTOPSIG (w) == SIGILL | |
2625 | || WSTOPSIG (w) == SIGSEGV) | |
2626 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2627 | ||
2628 | if (maybe_internal_trap) | |
2629 | { | |
2630 | /* Handle anything that requires bookkeeping before deciding to | |
2631 | report the event or continue waiting. */ | |
2632 | ||
2633 | /* First check if we can explain the SIGTRAP with an internal | |
2634 | breakpoint, or if we should possibly report the event to GDB. | |
2635 | Do this before anything that may remove or insert a | |
2636 | breakpoint. */ | |
2637 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2638 | ||
2639 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2640 | finished. If so, tweak the state machine accordingly, | |
2641 | reinsert breakpoints and delete any reinsert (software | |
2642 | single-step) breakpoints. */ | |
2643 | step_over_finished = finish_step_over (event_child); | |
2644 | ||
2645 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2646 | check_breakpoints (event_child->stop_pc); | |
2647 | ||
219f2f23 PA |
2648 | /* Handle tracepoint data collecting. This may overflow the |
2649 | trace buffer, and cause a tracing stop, removing | |
2650 | breakpoints. */ | |
2651 | trace_event = handle_tracepoints (event_child); | |
2652 | ||
6bf5e0ba PA |
2653 | if (bp_explains_trap) |
2654 | { | |
2655 | /* If we stepped or ran into an internal breakpoint, we've | |
2656 | already handled it. So next time we resume (from this | |
2657 | PC), we should step over it. */ | |
2658 | if (debug_threads) | |
87ce2a04 | 2659 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2660 | |
8b07ae33 PA |
2661 | if (breakpoint_here (event_child->stop_pc)) |
2662 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2663 | } |
2664 | } | |
2665 | else | |
2666 | { | |
2667 | /* We have some other signal, possibly a step-over dance was in | |
2668 | progress, and it should be cancelled too. */ | |
2669 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2670 | } |
2671 | ||
2672 | /* We have all the data we need. Either report the event to GDB, or | |
2673 | resume threads and keep waiting for more. */ | |
2674 | ||
2675 | /* If we're collecting a fast tracepoint, finish the collection and | |
2676 | move out of the jump pad before delivering a signal. See | |
2677 | linux_stabilize_threads. */ | |
2678 | ||
2679 | if (WIFSTOPPED (w) | |
2680 | && WSTOPSIG (w) != SIGTRAP | |
2681 | && supports_fast_tracepoints () | |
58b4daa5 | 2682 | && agent_loaded_p ()) |
fa593d66 PA |
2683 | { |
2684 | if (debug_threads) | |
87ce2a04 DE |
2685 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
2686 | "to defer or adjust it.\n", | |
d86d4aaf | 2687 | WSTOPSIG (w), lwpid_of (current_inferior)); |
fa593d66 PA |
2688 | |
2689 | /* Allow debugging the jump pad itself. */ | |
2690 | if (current_inferior->last_resume_kind != resume_step | |
2691 | && maybe_move_out_of_jump_pad (event_child, &w)) | |
2692 | { | |
2693 | enqueue_one_deferred_signal (event_child, &w); | |
2694 | ||
2695 | if (debug_threads) | |
87ce2a04 | 2696 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
d86d4aaf | 2697 | WSTOPSIG (w), lwpid_of (current_inferior)); |
fa593d66 PA |
2698 | |
2699 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
2700 | goto retry; | |
2701 | } | |
2702 | } | |
219f2f23 | 2703 | |
fa593d66 PA |
2704 | if (event_child->collecting_fast_tracepoint) |
2705 | { | |
2706 | if (debug_threads) | |
87ce2a04 DE |
2707 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
2708 | "Check if we're already there.\n", | |
d86d4aaf | 2709 | lwpid_of (current_inferior), |
87ce2a04 | 2710 | event_child->collecting_fast_tracepoint); |
fa593d66 PA |
2711 | |
2712 | trace_event = 1; | |
2713 | ||
2714 | event_child->collecting_fast_tracepoint | |
2715 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2716 | ||
2717 | if (event_child->collecting_fast_tracepoint != 1) | |
2718 | { | |
2719 | /* No longer need this breakpoint. */ | |
2720 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2721 | { | |
2722 | if (debug_threads) | |
87ce2a04 DE |
2723 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
2724 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2725 | |
2726 | /* Other running threads could hit this breakpoint. | |
2727 | We don't handle moribund locations like GDB does, | |
2728 | instead we always pause all threads when removing | |
2729 | breakpoints, so that any step-over or | |
2730 | decr_pc_after_break adjustment is always taken | |
2731 | care of while the breakpoint is still | |
2732 | inserted. */ | |
2733 | stop_all_lwps (1, event_child); | |
2734 | cancel_breakpoints (); | |
2735 | ||
2736 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2737 | event_child->exit_jump_pad_bkpt = NULL; | |
2738 | ||
2739 | unstop_all_lwps (1, event_child); | |
2740 | ||
2741 | gdb_assert (event_child->suspended >= 0); | |
2742 | } | |
2743 | } | |
2744 | ||
2745 | if (event_child->collecting_fast_tracepoint == 0) | |
2746 | { | |
2747 | if (debug_threads) | |
87ce2a04 DE |
2748 | debug_printf ("fast tracepoint finished " |
2749 | "collecting successfully.\n"); | |
fa593d66 PA |
2750 | |
2751 | /* We may have a deferred signal to report. */ | |
2752 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2753 | { | |
2754 | if (debug_threads) | |
87ce2a04 | 2755 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 2756 | } |
3c11dd79 | 2757 | else |
fa593d66 | 2758 | { |
3c11dd79 | 2759 | if (debug_threads) |
87ce2a04 | 2760 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
2761 | |
2762 | if (stabilizing_threads) | |
2763 | { | |
2764 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 2765 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
2766 | |
2767 | if (debug_threads) | |
2768 | { | |
2769 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
2770 | "while stabilizing threads\n", | |
d86d4aaf | 2771 | target_pid_to_str (ptid_of (current_inferior))); |
87ce2a04 DE |
2772 | debug_exit (); |
2773 | } | |
2774 | ||
d86d4aaf | 2775 | return ptid_of (current_inferior); |
fa593d66 PA |
2776 | } |
2777 | } | |
2778 | } | |
6bf5e0ba PA |
2779 | } |
2780 | ||
e471f25b PA |
2781 | /* Check whether GDB would be interested in this event. */ |
2782 | ||
2783 | /* If GDB is not interested in this signal, don't stop other | |
2784 | threads, and don't report it to GDB. Just resume the inferior | |
2785 | right away. We do this for threading-related signals as well as | |
2786 | any that GDB specifically requested we ignore. But never ignore | |
2787 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2788 | stepping - they may require special handling to skip the signal | |
2789 | handler. */ | |
2790 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2791 | thread library? */ | |
2792 | if (WIFSTOPPED (w) | |
2793 | && current_inferior->last_resume_kind != resume_step | |
2794 | && ( | |
1a981360 | 2795 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2796 | (current_process ()->private->thread_db != NULL |
2797 | && (WSTOPSIG (w) == __SIGRTMIN | |
2798 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2799 | || | |
2800 | #endif | |
2ea28649 | 2801 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b PA |
2802 | && !(WSTOPSIG (w) == SIGSTOP |
2803 | && current_inferior->last_resume_kind == resume_stop)))) | |
2804 | { | |
2805 | siginfo_t info, *info_p; | |
2806 | ||
2807 | if (debug_threads) | |
87ce2a04 | 2808 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
d86d4aaf | 2809 | WSTOPSIG (w), lwpid_of (current_inferior)); |
e471f25b | 2810 | |
d86d4aaf | 2811 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_inferior), |
b8e1b30e | 2812 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
2813 | info_p = &info; |
2814 | else | |
2815 | info_p = NULL; | |
2816 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2817 | WSTOPSIG (w), info_p); | |
2818 | goto retry; | |
2819 | } | |
2820 | ||
c2d6af84 PA |
2821 | /* Note that all addresses are always "out of the step range" when |
2822 | there's no range to begin with. */ | |
2823 | in_step_range = lwp_in_step_range (event_child); | |
2824 | ||
2825 | /* If GDB wanted this thread to single step, and the thread is out | |
2826 | of the step range, we always want to report the SIGTRAP, and let | |
2827 | GDB handle it. Watchpoints should always be reported. So should | |
2828 | signals we can't explain. A SIGTRAP we can't explain could be a | |
2829 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
2830 | do, we're be able to handle GDB breakpoints on top of internal | |
2831 | breakpoints, by handling the internal breakpoint and still | |
2832 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
2833 | won't see the breakpoint hit. */ | |
6bf5e0ba | 2834 | report_to_gdb = (!maybe_internal_trap |
c2d6af84 PA |
2835 | || (current_inferior->last_resume_kind == resume_step |
2836 | && !in_step_range) | |
6bf5e0ba | 2837 | || event_child->stopped_by_watchpoint |
c2d6af84 | 2838 | || (!step_over_finished && !in_step_range |
493e2a69 | 2839 | && !bp_explains_trap && !trace_event) |
9f3a5c85 | 2840 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 SS |
2841 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
2842 | && gdb_no_commands_at_breakpoint (event_child->stop_pc))); | |
2843 | ||
2844 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
2845 | |
2846 | /* We found no reason GDB would want us to stop. We either hit one | |
2847 | of our own breakpoints, or finished an internal step GDB | |
2848 | shouldn't know about. */ | |
2849 | if (!report_to_gdb) | |
2850 | { | |
2851 | if (debug_threads) | |
2852 | { | |
2853 | if (bp_explains_trap) | |
87ce2a04 | 2854 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2855 | if (step_over_finished) |
87ce2a04 | 2856 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 2857 | if (trace_event) |
87ce2a04 | 2858 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 2859 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
2860 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
2861 | paddress (event_child->stop_pc), | |
2862 | paddress (event_child->step_range_start), | |
2863 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
2864 | } |
2865 | ||
2866 | /* We're not reporting this breakpoint to GDB, so apply the | |
2867 | decr_pc_after_break adjustment to the inferior's regcache | |
2868 | ourselves. */ | |
2869 | ||
2870 | if (the_low_target.set_pc != NULL) | |
2871 | { | |
2872 | struct regcache *regcache | |
d86d4aaf | 2873 | = get_thread_regcache (current_inferior, 1); |
6bf5e0ba PA |
2874 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
2875 | } | |
2876 | ||
7984d532 PA |
2877 | /* We may have finished stepping over a breakpoint. If so, |
2878 | we've stopped and suspended all LWPs momentarily except the | |
2879 | stepping one. This is where we resume them all again. We're | |
2880 | going to keep waiting, so use proceed, which handles stepping | |
2881 | over the next breakpoint. */ | |
6bf5e0ba | 2882 | if (debug_threads) |
87ce2a04 | 2883 | debug_printf ("proceeding all threads.\n"); |
7984d532 PA |
2884 | |
2885 | if (step_over_finished) | |
2886 | unsuspend_all_lwps (event_child); | |
2887 | ||
6bf5e0ba PA |
2888 | proceed_all_lwps (); |
2889 | goto retry; | |
2890 | } | |
2891 | ||
2892 | if (debug_threads) | |
2893 | { | |
8336d594 | 2894 | if (current_inferior->last_resume_kind == resume_step) |
c2d6af84 PA |
2895 | { |
2896 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 2897 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 2898 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 2899 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 2900 | } |
6bf5e0ba | 2901 | if (event_child->stopped_by_watchpoint) |
87ce2a04 | 2902 | debug_printf ("Stopped by watchpoint.\n"); |
8b07ae33 | 2903 | if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 2904 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 2905 | if (debug_threads) |
87ce2a04 | 2906 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
2907 | } |
2908 | ||
2909 | /* Alright, we're going to report a stop. */ | |
2910 | ||
fa593d66 | 2911 | if (!non_stop && !stabilizing_threads) |
6bf5e0ba PA |
2912 | { |
2913 | /* In all-stop, stop all threads. */ | |
7984d532 | 2914 | stop_all_lwps (0, NULL); |
6bf5e0ba PA |
2915 | |
2916 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2917 | from among those that have had events. Giving equal priority | |
2918 | to all LWPs that have had events helps prevent | |
2919 | starvation. */ | |
2920 | if (ptid_equal (ptid, minus_one_ptid)) | |
2921 | { | |
2922 | event_child->status_pending_p = 1; | |
2923 | event_child->status_pending = w; | |
2924 | ||
2925 | select_event_lwp (&event_child); | |
2926 | ||
ee1e2d4f DE |
2927 | /* current_inferior and event_child must stay in sync. */ |
2928 | current_inferior = get_lwp_thread (event_child); | |
2929 | ||
6bf5e0ba PA |
2930 | event_child->status_pending_p = 0; |
2931 | w = event_child->status_pending; | |
2932 | } | |
2933 | ||
2934 | /* Now that we've selected our final event LWP, cancel any | |
2935 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
2936 | See the comment in cancel_breakpoints_callback to find out | |
2937 | why. */ | |
d86d4aaf | 2938 | find_inferior (&all_threads, cancel_breakpoints_callback, event_child); |
fa593d66 | 2939 | |
c03e6ccc YQ |
2940 | /* If we were going a step-over, all other threads but the stepping one |
2941 | had been paused in start_step_over, with their suspend counts | |
2942 | incremented. We don't want to do a full unstop/unpause, because we're | |
2943 | in all-stop mode (so we want threads stopped), but we still need to | |
2944 | unsuspend the other threads, to decrement their `suspended' count | |
2945 | back. */ | |
2946 | if (step_over_finished) | |
2947 | unsuspend_all_lwps (event_child); | |
2948 | ||
fa593d66 PA |
2949 | /* Stabilize threads (move out of jump pads). */ |
2950 | stabilize_threads (); | |
6bf5e0ba PA |
2951 | } |
2952 | else | |
2953 | { | |
2954 | /* If we just finished a step-over, then all threads had been | |
2955 | momentarily paused. In all-stop, that's fine, we want | |
2956 | threads stopped by now anyway. In non-stop, we need to | |
2957 | re-resume threads that GDB wanted to be running. */ | |
2958 | if (step_over_finished) | |
7984d532 | 2959 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2960 | } |
2961 | ||
5b1c542e | 2962 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2963 | |
8336d594 PA |
2964 | if (current_inferior->last_resume_kind == resume_stop |
2965 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
2966 | { |
2967 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2968 | and it stopped cleanly, so report as SIG0. The use of | |
2969 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 2970 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 2971 | } |
8336d594 PA |
2972 | else if (current_inferior->last_resume_kind == resume_stop |
2973 | && WSTOPSIG (w) != SIGSTOP) | |
bd99dc85 PA |
2974 | { |
2975 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2976 | but, it stopped for other reasons. */ |
2ea28649 | 2977 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2978 | } |
2979 | else | |
2980 | { | |
2ea28649 | 2981 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2982 | } |
2983 | ||
d50171e4 PA |
2984 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2985 | ||
bd99dc85 | 2986 | if (debug_threads) |
87ce2a04 DE |
2987 | { |
2988 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
d86d4aaf | 2989 | target_pid_to_str (ptid_of (current_inferior)), |
87ce2a04 DE |
2990 | ourstatus->kind, ourstatus->value.sig); |
2991 | debug_exit (); | |
2992 | } | |
bd99dc85 | 2993 | |
d86d4aaf | 2994 | return ptid_of (current_inferior); |
bd99dc85 PA |
2995 | } |
2996 | ||
2997 | /* Get rid of any pending event in the pipe. */ | |
2998 | static void | |
2999 | async_file_flush (void) | |
3000 | { | |
3001 | int ret; | |
3002 | char buf; | |
3003 | ||
3004 | do | |
3005 | ret = read (linux_event_pipe[0], &buf, 1); | |
3006 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3007 | } | |
3008 | ||
3009 | /* Put something in the pipe, so the event loop wakes up. */ | |
3010 | static void | |
3011 | async_file_mark (void) | |
3012 | { | |
3013 | int ret; | |
3014 | ||
3015 | async_file_flush (); | |
3016 | ||
3017 | do | |
3018 | ret = write (linux_event_pipe[1], "+", 1); | |
3019 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3020 | ||
3021 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3022 | be awakened anyway. */ | |
3023 | } | |
3024 | ||
95954743 PA |
3025 | static ptid_t |
3026 | linux_wait (ptid_t ptid, | |
3027 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 3028 | { |
95954743 | 3029 | ptid_t event_ptid; |
bd99dc85 | 3030 | |
bd99dc85 PA |
3031 | /* Flush the async file first. */ |
3032 | if (target_is_async_p ()) | |
3033 | async_file_flush (); | |
3034 | ||
95954743 | 3035 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
3036 | |
3037 | /* If at least one stop was reported, there may be more. A single | |
3038 | SIGCHLD can signal more than one child stop. */ | |
3039 | if (target_is_async_p () | |
3040 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 3041 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
3042 | async_file_mark (); |
3043 | ||
3044 | return event_ptid; | |
da6d8c04 DJ |
3045 | } |
3046 | ||
c5f62d5f | 3047 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3048 | |
3049 | static int | |
a1928bad | 3050 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3051 | { |
c5f62d5f DE |
3052 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
3053 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 3054 | |
c5f62d5f DE |
3055 | #ifdef __NR_tkill |
3056 | { | |
3057 | static int tkill_failed; | |
fd500816 | 3058 | |
c5f62d5f DE |
3059 | if (!tkill_failed) |
3060 | { | |
3061 | int ret; | |
3062 | ||
3063 | errno = 0; | |
3064 | ret = syscall (__NR_tkill, lwpid, signo); | |
3065 | if (errno != ENOSYS) | |
3066 | return ret; | |
3067 | tkill_failed = 1; | |
3068 | } | |
3069 | } | |
fd500816 DJ |
3070 | #endif |
3071 | ||
3072 | return kill (lwpid, signo); | |
3073 | } | |
3074 | ||
964e4306 PA |
3075 | void |
3076 | linux_stop_lwp (struct lwp_info *lwp) | |
3077 | { | |
3078 | send_sigstop (lwp); | |
3079 | } | |
3080 | ||
0d62e5e8 | 3081 | static void |
02fc4de7 | 3082 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3083 | { |
bd99dc85 | 3084 | int pid; |
0d62e5e8 | 3085 | |
d86d4aaf | 3086 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3087 | |
0d62e5e8 DJ |
3088 | /* If we already have a pending stop signal for this process, don't |
3089 | send another. */ | |
54a0b537 | 3090 | if (lwp->stop_expected) |
0d62e5e8 | 3091 | { |
ae13219e | 3092 | if (debug_threads) |
87ce2a04 | 3093 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3094 | |
0d62e5e8 DJ |
3095 | return; |
3096 | } | |
3097 | ||
3098 | if (debug_threads) | |
87ce2a04 | 3099 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3100 | |
d50171e4 | 3101 | lwp->stop_expected = 1; |
bd99dc85 | 3102 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3103 | } |
3104 | ||
7984d532 PA |
3105 | static int |
3106 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 | 3107 | { |
d86d4aaf DE |
3108 | struct thread_info *thread = (struct thread_info *) entry; |
3109 | struct lwp_info *lwp = get_thread_lwp (thread); | |
02fc4de7 | 3110 | |
7984d532 PA |
3111 | /* Ignore EXCEPT. */ |
3112 | if (lwp == except) | |
3113 | return 0; | |
3114 | ||
02fc4de7 | 3115 | if (lwp->stopped) |
7984d532 | 3116 | return 0; |
02fc4de7 PA |
3117 | |
3118 | send_sigstop (lwp); | |
7984d532 PA |
3119 | return 0; |
3120 | } | |
3121 | ||
3122 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3123 | yet. */ | |
3124 | static int | |
3125 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
3126 | void *except) | |
3127 | { | |
d86d4aaf DE |
3128 | struct thread_info *thread = (struct thread_info *) entry; |
3129 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
3130 | |
3131 | /* Ignore EXCEPT. */ | |
3132 | if (lwp == except) | |
3133 | return 0; | |
3134 | ||
3135 | lwp->suspended++; | |
3136 | ||
3137 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
3138 | } |
3139 | ||
95954743 PA |
3140 | static void |
3141 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3142 | { | |
3143 | /* It's dead, really. */ | |
3144 | lwp->dead = 1; | |
3145 | ||
3146 | /* Store the exit status for later. */ | |
3147 | lwp->status_pending_p = 1; | |
3148 | lwp->status_pending = wstat; | |
3149 | ||
95954743 PA |
3150 | /* Prevent trying to stop it. */ |
3151 | lwp->stopped = 1; | |
3152 | ||
3153 | /* No further stops are expected from a dead lwp. */ | |
3154 | lwp->stop_expected = 0; | |
3155 | } | |
3156 | ||
fa96cb38 PA |
3157 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
3158 | ||
0d62e5e8 | 3159 | static void |
fa96cb38 | 3160 | wait_for_sigstop (void) |
0d62e5e8 | 3161 | { |
bd99dc85 | 3162 | struct thread_info *saved_inferior; |
95954743 | 3163 | ptid_t saved_tid; |
fa96cb38 PA |
3164 | int wstat; |
3165 | int ret; | |
0d62e5e8 DJ |
3166 | |
3167 | saved_inferior = current_inferior; | |
bd99dc85 | 3168 | if (saved_inferior != NULL) |
80894984 | 3169 | saved_tid = saved_inferior->entry.id; |
bd99dc85 | 3170 | else |
95954743 | 3171 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3172 | |
d50171e4 | 3173 | if (debug_threads) |
fa96cb38 | 3174 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3175 | |
fa96cb38 PA |
3176 | /* Passing NULL_PTID as filter indicates we want all events to be |
3177 | left pending. Eventually this returns when there are no | |
3178 | unwaited-for children left. */ | |
3179 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
3180 | &wstat, __WALL); | |
3181 | gdb_assert (ret == -1); | |
0d62e5e8 | 3182 | |
bd99dc85 | 3183 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
3184 | current_inferior = saved_inferior; |
3185 | else | |
3186 | { | |
3187 | if (debug_threads) | |
87ce2a04 | 3188 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3189 | |
bd99dc85 PA |
3190 | if (non_stop) |
3191 | { | |
3192 | /* We can't change the current inferior behind GDB's back, | |
3193 | otherwise, a subsequent command may apply to the wrong | |
3194 | process. */ | |
3195 | current_inferior = NULL; | |
3196 | } | |
3197 | else | |
3198 | { | |
3199 | /* Set a valid thread as current. */ | |
3200 | set_desired_inferior (0); | |
3201 | } | |
0d62e5e8 DJ |
3202 | } |
3203 | } | |
3204 | ||
fa593d66 PA |
3205 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3206 | move it out, because we need to report the stop event to GDB. For | |
3207 | example, if the user puts a breakpoint in the jump pad, it's | |
3208 | because she wants to debug it. */ | |
3209 | ||
3210 | static int | |
3211 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3212 | { | |
d86d4aaf DE |
3213 | struct thread_info *thread = (struct thread_info *) entry; |
3214 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3215 | |
3216 | gdb_assert (lwp->suspended == 0); | |
3217 | gdb_assert (lwp->stopped); | |
3218 | ||
3219 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3220 | return (supports_fast_tracepoints () | |
58b4daa5 | 3221 | && agent_loaded_p () |
fa593d66 PA |
3222 | && (gdb_breakpoint_here (lwp->stop_pc) |
3223 | || lwp->stopped_by_watchpoint | |
3224 | || thread->last_resume_kind == resume_step) | |
3225 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3226 | } | |
3227 | ||
3228 | static void | |
3229 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3230 | { | |
d86d4aaf DE |
3231 | struct thread_info *thread = (struct thread_info *) entry; |
3232 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3233 | int *wstat; |
3234 | ||
3235 | gdb_assert (lwp->suspended == 0); | |
3236 | gdb_assert (lwp->stopped); | |
3237 | ||
3238 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3239 | ||
3240 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3241 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
3242 | && !lwp->stopped_by_watchpoint | |
3243 | && thread->last_resume_kind != resume_step | |
3244 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3245 | { | |
3246 | if (debug_threads) | |
87ce2a04 | 3247 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3248 | lwpid_of (thread)); |
fa593d66 PA |
3249 | |
3250 | if (wstat) | |
3251 | { | |
3252 | lwp->status_pending_p = 0; | |
3253 | enqueue_one_deferred_signal (lwp, wstat); | |
3254 | ||
3255 | if (debug_threads) | |
87ce2a04 DE |
3256 | debug_printf ("Signal %d for LWP %ld deferred " |
3257 | "(in jump pad)\n", | |
d86d4aaf | 3258 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
3259 | } |
3260 | ||
3261 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3262 | } | |
3263 | else | |
3264 | lwp->suspended++; | |
3265 | } | |
3266 | ||
3267 | static int | |
3268 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3269 | { | |
d86d4aaf DE |
3270 | struct thread_info *thread = (struct thread_info *) entry; |
3271 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3272 | |
3273 | if (lwp->dead) | |
3274 | return 0; | |
3275 | if (lwp->stopped) | |
3276 | return 0; | |
3277 | return 1; | |
3278 | } | |
3279 | ||
7984d532 PA |
3280 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3281 | If SUSPEND, then also increase the suspend count of every LWP, | |
3282 | except EXCEPT. */ | |
3283 | ||
0d62e5e8 | 3284 | static void |
7984d532 | 3285 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3286 | { |
bde24c0a PA |
3287 | /* Should not be called recursively. */ |
3288 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3289 | ||
87ce2a04 DE |
3290 | if (debug_threads) |
3291 | { | |
3292 | debug_enter (); | |
3293 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
3294 | suspend ? "stop-and-suspend" : "stop", | |
3295 | except != NULL | |
d86d4aaf | 3296 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
3297 | : "none"); |
3298 | } | |
3299 | ||
bde24c0a PA |
3300 | stopping_threads = (suspend |
3301 | ? STOPPING_AND_SUSPENDING_THREADS | |
3302 | : STOPPING_THREADS); | |
7984d532 PA |
3303 | |
3304 | if (suspend) | |
d86d4aaf | 3305 | find_inferior (&all_threads, suspend_and_send_sigstop_callback, except); |
7984d532 | 3306 | else |
d86d4aaf | 3307 | find_inferior (&all_threads, send_sigstop_callback, except); |
fa96cb38 | 3308 | wait_for_sigstop (); |
bde24c0a | 3309 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
3310 | |
3311 | if (debug_threads) | |
3312 | { | |
3313 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
3314 | "back to !stopping\n"); | |
3315 | debug_exit (); | |
3316 | } | |
0d62e5e8 DJ |
3317 | } |
3318 | ||
da6d8c04 DJ |
3319 | /* Resume execution of the inferior process. |
3320 | If STEP is nonzero, single-step it. | |
3321 | If SIGNAL is nonzero, give it that signal. */ | |
3322 | ||
ce3a066d | 3323 | static void |
2acc282a | 3324 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 3325 | int step, int signal, siginfo_t *info) |
da6d8c04 | 3326 | { |
d86d4aaf | 3327 | struct thread_info *thread = get_lwp_thread (lwp); |
0d62e5e8 | 3328 | struct thread_info *saved_inferior; |
fa593d66 | 3329 | int fast_tp_collecting; |
0d62e5e8 | 3330 | |
54a0b537 | 3331 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3332 | return; |
3333 | ||
fa593d66 PA |
3334 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3335 | ||
3336 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3337 | ||
219f2f23 PA |
3338 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3339 | user used the "jump" command, or "set $pc = foo"). */ | |
3340 | if (lwp->stop_pc != get_pc (lwp)) | |
3341 | { | |
3342 | /* Collecting 'while-stepping' actions doesn't make sense | |
3343 | anymore. */ | |
d86d4aaf | 3344 | release_while_stepping_state_list (thread); |
219f2f23 PA |
3345 | } |
3346 | ||
0d62e5e8 DJ |
3347 | /* If we have pending signals or status, and a new signal, enqueue the |
3348 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3349 | breakpoint; it will be picked up again below. */ | |
3350 | if (signal != 0 | |
fa593d66 PA |
3351 | && (lwp->status_pending_p |
3352 | || lwp->pending_signals != NULL | |
3353 | || lwp->bp_reinsert != 0 | |
3354 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3355 | { |
3356 | struct pending_signals *p_sig; | |
bca929d3 | 3357 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3358 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3359 | p_sig->signal = signal; |
32ca6d61 DJ |
3360 | if (info == NULL) |
3361 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3362 | else | |
3363 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3364 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3365 | } |
3366 | ||
d50171e4 PA |
3367 | if (lwp->status_pending_p) |
3368 | { | |
3369 | if (debug_threads) | |
87ce2a04 DE |
3370 | debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);" |
3371 | " has pending status\n", | |
d86d4aaf | 3372 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3373 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
3374 | return; |
3375 | } | |
0d62e5e8 DJ |
3376 | |
3377 | saved_inferior = current_inferior; | |
d86d4aaf | 3378 | current_inferior = thread; |
0d62e5e8 DJ |
3379 | |
3380 | if (debug_threads) | |
87ce2a04 | 3381 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", |
d86d4aaf | 3382 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3383 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3384 | |
3385 | /* This bit needs some thinking about. If we get a signal that | |
3386 | we must report while a single-step reinsert is still pending, | |
3387 | we often end up resuming the thread. It might be better to | |
3388 | (ew) allow a stack of pending events; then we could be sure that | |
3389 | the reinsert happened right away and not lose any signals. | |
3390 | ||
3391 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3392 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3393 | complete correctness, so it won't solve that problem. It may be |
3394 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3395 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3396 | { |
3397 | if (debug_threads) | |
87ce2a04 DE |
3398 | debug_printf (" pending reinsert at 0x%s\n", |
3399 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 3400 | |
85e00e85 | 3401 | if (can_hardware_single_step ()) |
d50171e4 | 3402 | { |
fa593d66 PA |
3403 | if (fast_tp_collecting == 0) |
3404 | { | |
3405 | if (step == 0) | |
3406 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3407 | if (lwp->suspended) | |
3408 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3409 | lwp->suspended); | |
3410 | } | |
d50171e4 PA |
3411 | |
3412 | step = 1; | |
3413 | } | |
0d62e5e8 DJ |
3414 | |
3415 | /* Postpone any pending signal. It was enqueued above. */ | |
3416 | signal = 0; | |
3417 | } | |
3418 | ||
fa593d66 PA |
3419 | if (fast_tp_collecting == 1) |
3420 | { | |
3421 | if (debug_threads) | |
87ce2a04 DE |
3422 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3423 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 3424 | lwpid_of (thread)); |
fa593d66 PA |
3425 | |
3426 | /* Postpone any pending signal. It was enqueued above. */ | |
3427 | signal = 0; | |
3428 | } | |
3429 | else if (fast_tp_collecting == 2) | |
3430 | { | |
3431 | if (debug_threads) | |
87ce2a04 DE |
3432 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3433 | " single-stepping\n", | |
d86d4aaf | 3434 | lwpid_of (thread)); |
fa593d66 PA |
3435 | |
3436 | if (can_hardware_single_step ()) | |
3437 | step = 1; | |
3438 | else | |
3439 | fatal ("moving out of jump pad single-stepping" | |
3440 | " not implemented on this target"); | |
3441 | ||
3442 | /* Postpone any pending signal. It was enqueued above. */ | |
3443 | signal = 0; | |
3444 | } | |
3445 | ||
219f2f23 PA |
3446 | /* If we have while-stepping actions in this thread set it stepping. |
3447 | If we have a signal to deliver, it may or may not be set to | |
3448 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3449 | while-stepping into a signal handler. A possible smart thing to | |
3450 | do would be to set an internal breakpoint at the signal return | |
3451 | address, continue, and carry on catching this while-stepping | |
3452 | action only when that breakpoint is hit. A future | |
3453 | enhancement. */ | |
d86d4aaf | 3454 | if (thread->while_stepping != NULL |
219f2f23 PA |
3455 | && can_hardware_single_step ()) |
3456 | { | |
3457 | if (debug_threads) | |
87ce2a04 | 3458 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 3459 | lwpid_of (thread)); |
219f2f23 PA |
3460 | step = 1; |
3461 | } | |
3462 | ||
aa691b87 | 3463 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 3464 | { |
442ea881 PA |
3465 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
3466 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
87ce2a04 | 3467 | debug_printf (" resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
3468 | } |
3469 | ||
fa593d66 PA |
3470 | /* If we have pending signals, consume one unless we are trying to |
3471 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3472 | collect. */ | |
3473 | if (lwp->pending_signals != NULL | |
3474 | && lwp->bp_reinsert == 0 | |
3475 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3476 | { |
3477 | struct pending_signals **p_sig; | |
3478 | ||
54a0b537 | 3479 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3480 | while ((*p_sig)->prev != NULL) |
3481 | p_sig = &(*p_sig)->prev; | |
3482 | ||
3483 | signal = (*p_sig)->signal; | |
32ca6d61 | 3484 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 3485 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3486 | &(*p_sig)->info); |
32ca6d61 | 3487 | |
0d62e5e8 DJ |
3488 | free (*p_sig); |
3489 | *p_sig = NULL; | |
3490 | } | |
3491 | ||
aa5ca48f DE |
3492 | if (the_low_target.prepare_to_resume != NULL) |
3493 | the_low_target.prepare_to_resume (lwp); | |
3494 | ||
d86d4aaf | 3495 | regcache_invalidate_thread (thread); |
da6d8c04 | 3496 | errno = 0; |
54a0b537 | 3497 | lwp->stopped = 0; |
c3adc08c | 3498 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 3499 | lwp->stepping = step; |
d86d4aaf | 3500 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (thread), |
b8e1b30e | 3501 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
3502 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3503 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 3504 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 DJ |
3505 | |
3506 | current_inferior = saved_inferior; | |
da6d8c04 | 3507 | if (errno) |
3221518c UW |
3508 | { |
3509 | /* ESRCH from ptrace either means that the thread was already | |
3510 | running (an error) or that it is gone (a race condition). If | |
3511 | it's gone, we will get a notification the next time we wait, | |
3512 | so we can ignore the error. We could differentiate these | |
3513 | two, but it's tricky without waiting; the thread still exists | |
3514 | as a zombie, so sending it signal 0 would succeed. So just | |
3515 | ignore ESRCH. */ | |
3516 | if (errno == ESRCH) | |
3517 | return; | |
3518 | ||
3519 | perror_with_name ("ptrace"); | |
3520 | } | |
da6d8c04 DJ |
3521 | } |
3522 | ||
2bd7c093 PA |
3523 | struct thread_resume_array |
3524 | { | |
3525 | struct thread_resume *resume; | |
3526 | size_t n; | |
3527 | }; | |
64386c31 | 3528 | |
ebcf782c DE |
3529 | /* This function is called once per thread via find_inferior. |
3530 | ARG is a pointer to a thread_resume_array struct. | |
3531 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
3532 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
3533 | |
3534 | This algorithm is O(threads * resume elements), but resume elements | |
3535 | is small (and will remain small at least until GDB supports thread | |
3536 | suspension). */ | |
ebcf782c | 3537 | |
2bd7c093 PA |
3538 | static int |
3539 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3540 | { |
d86d4aaf DE |
3541 | struct thread_info *thread = (struct thread_info *) entry; |
3542 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3543 | int ndx; |
2bd7c093 | 3544 | struct thread_resume_array *r; |
64386c31 | 3545 | |
2bd7c093 | 3546 | r = arg; |
64386c31 | 3547 | |
2bd7c093 | 3548 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3549 | { |
3550 | ptid_t ptid = r->resume[ndx].thread; | |
3551 | if (ptid_equal (ptid, minus_one_ptid) | |
3552 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
3553 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
3554 | of PID'. */ | |
d86d4aaf | 3555 | || (ptid_get_pid (ptid) == pid_of (thread) |
0c9070b3 YQ |
3556 | && (ptid_is_pid (ptid) |
3557 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 3558 | { |
d50171e4 | 3559 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3560 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3561 | { |
3562 | if (debug_threads) | |
87ce2a04 DE |
3563 | debug_printf ("already %s LWP %ld at GDB's request\n", |
3564 | (thread->last_status.kind | |
3565 | == TARGET_WAITKIND_STOPPED) | |
3566 | ? "stopped" | |
3567 | : "stopping", | |
d86d4aaf | 3568 | lwpid_of (thread)); |
d50171e4 PA |
3569 | |
3570 | continue; | |
3571 | } | |
3572 | ||
95954743 | 3573 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3574 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 3575 | |
c2d6af84 PA |
3576 | lwp->step_range_start = lwp->resume->step_range_start; |
3577 | lwp->step_range_end = lwp->resume->step_range_end; | |
3578 | ||
fa593d66 PA |
3579 | /* If we had a deferred signal to report, dequeue one now. |
3580 | This can happen if LWP gets more than one signal while | |
3581 | trying to get out of a jump pad. */ | |
3582 | if (lwp->stopped | |
3583 | && !lwp->status_pending_p | |
3584 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3585 | { | |
3586 | lwp->status_pending_p = 1; | |
3587 | ||
3588 | if (debug_threads) | |
87ce2a04 DE |
3589 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
3590 | "leaving status pending.\n", | |
d86d4aaf DE |
3591 | WSTOPSIG (lwp->status_pending), |
3592 | lwpid_of (thread)); | |
fa593d66 PA |
3593 | } |
3594 | ||
95954743 PA |
3595 | return 0; |
3596 | } | |
3597 | } | |
2bd7c093 PA |
3598 | |
3599 | /* No resume action for this thread. */ | |
3600 | lwp->resume = NULL; | |
64386c31 | 3601 | |
2bd7c093 | 3602 | return 0; |
5544ad89 DJ |
3603 | } |
3604 | ||
20ad9378 DE |
3605 | /* find_inferior callback for linux_resume. |
3606 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 3607 | |
bd99dc85 PA |
3608 | static int |
3609 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3610 | { |
d86d4aaf DE |
3611 | struct thread_info *thread = (struct thread_info *) entry; |
3612 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3613 | |
bd99dc85 PA |
3614 | /* LWPs which will not be resumed are not interesting, because |
3615 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3616 | if (lwp->resume == NULL) |
bd99dc85 | 3617 | return 0; |
64386c31 | 3618 | |
bd99dc85 | 3619 | if (lwp->status_pending_p) |
d50171e4 PA |
3620 | * (int *) flag_p = 1; |
3621 | ||
3622 | return 0; | |
3623 | } | |
3624 | ||
3625 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3626 | internal breakpoint that we need to step over. It assumes that any | |
3627 | required STOP_PC adjustment has already been propagated to the | |
3628 | inferior's regcache. */ | |
3629 | ||
3630 | static int | |
3631 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3632 | { | |
d86d4aaf DE |
3633 | struct thread_info *thread = (struct thread_info *) entry; |
3634 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
3635 | struct thread_info *saved_inferior; |
3636 | CORE_ADDR pc; | |
3637 | ||
3638 | /* LWPs which will not be resumed are not interesting, because we | |
3639 | might not wait for them next time through linux_wait. */ | |
3640 | ||
3641 | if (!lwp->stopped) | |
3642 | { | |
3643 | if (debug_threads) | |
87ce2a04 | 3644 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 3645 | lwpid_of (thread)); |
d50171e4 PA |
3646 | return 0; |
3647 | } | |
3648 | ||
8336d594 | 3649 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3650 | { |
3651 | if (debug_threads) | |
87ce2a04 DE |
3652 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
3653 | " stopped\n", | |
d86d4aaf | 3654 | lwpid_of (thread)); |
d50171e4 PA |
3655 | return 0; |
3656 | } | |
3657 | ||
7984d532 PA |
3658 | gdb_assert (lwp->suspended >= 0); |
3659 | ||
3660 | if (lwp->suspended) | |
3661 | { | |
3662 | if (debug_threads) | |
87ce2a04 | 3663 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 3664 | lwpid_of (thread)); |
7984d532 PA |
3665 | return 0; |
3666 | } | |
3667 | ||
d50171e4 PA |
3668 | if (!lwp->need_step_over) |
3669 | { | |
3670 | if (debug_threads) | |
d86d4aaf | 3671 | debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread)); |
d50171e4 | 3672 | } |
5544ad89 | 3673 | |
bd99dc85 | 3674 | if (lwp->status_pending_p) |
d50171e4 PA |
3675 | { |
3676 | if (debug_threads) | |
87ce2a04 DE |
3677 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
3678 | " status.\n", | |
d86d4aaf | 3679 | lwpid_of (thread)); |
d50171e4 PA |
3680 | return 0; |
3681 | } | |
3682 | ||
3683 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3684 | or we have. */ | |
3685 | pc = get_pc (lwp); | |
3686 | ||
3687 | /* If the PC has changed since we stopped, then don't do anything, | |
3688 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3689 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3690 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3691 | command, or poked thread's registers herself. */ | |
3692 | if (pc != lwp->stop_pc) | |
3693 | { | |
3694 | if (debug_threads) | |
87ce2a04 DE |
3695 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
3696 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
3697 | lwpid_of (thread), |
3698 | paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
3699 | |
3700 | lwp->need_step_over = 0; | |
3701 | return 0; | |
3702 | } | |
3703 | ||
3704 | saved_inferior = current_inferior; | |
8336d594 | 3705 | current_inferior = thread; |
d50171e4 | 3706 | |
8b07ae33 | 3707 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3708 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3709 | { |
8b07ae33 | 3710 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
3711 | though. If the condition is being evaluated on the target's side |
3712 | and it evaluate to false, step over this breakpoint as well. */ | |
3713 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
3714 | && gdb_condition_true_at_breakpoint (pc) |
3715 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
3716 | { |
3717 | if (debug_threads) | |
87ce2a04 DE |
3718 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
3719 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 3720 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 3721 | |
8b07ae33 PA |
3722 | current_inferior = saved_inferior; |
3723 | return 0; | |
3724 | } | |
3725 | else | |
3726 | { | |
3727 | if (debug_threads) | |
87ce2a04 DE |
3728 | debug_printf ("Need step over [LWP %ld]? yes, " |
3729 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 3730 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 3731 | |
8b07ae33 PA |
3732 | /* We've found an lwp that needs stepping over --- return 1 so |
3733 | that find_inferior stops looking. */ | |
3734 | current_inferior = saved_inferior; | |
3735 | ||
3736 | /* If the step over is cancelled, this is set again. */ | |
3737 | lwp->need_step_over = 0; | |
3738 | return 1; | |
3739 | } | |
d50171e4 PA |
3740 | } |
3741 | ||
3742 | current_inferior = saved_inferior; | |
3743 | ||
3744 | if (debug_threads) | |
87ce2a04 DE |
3745 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
3746 | " at 0x%s\n", | |
d86d4aaf | 3747 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 3748 | |
bd99dc85 | 3749 | return 0; |
5544ad89 DJ |
3750 | } |
3751 | ||
d50171e4 PA |
3752 | /* Start a step-over operation on LWP. When LWP stopped at a |
3753 | breakpoint, to make progress, we need to remove the breakpoint out | |
3754 | of the way. If we let other threads run while we do that, they may | |
3755 | pass by the breakpoint location and miss hitting it. To avoid | |
3756 | that, a step-over momentarily stops all threads while LWP is | |
3757 | single-stepped while the breakpoint is temporarily uninserted from | |
3758 | the inferior. When the single-step finishes, we reinsert the | |
3759 | breakpoint, and let all threads that are supposed to be running, | |
3760 | run again. | |
3761 | ||
3762 | On targets that don't support hardware single-step, we don't | |
3763 | currently support full software single-stepping. Instead, we only | |
3764 | support stepping over the thread event breakpoint, by asking the | |
3765 | low target where to place a reinsert breakpoint. Since this | |
3766 | routine assumes the breakpoint being stepped over is a thread event | |
3767 | breakpoint, it usually assumes the return address of the current | |
3768 | function is a good enough place to set the reinsert breakpoint. */ | |
3769 | ||
3770 | static int | |
3771 | start_step_over (struct lwp_info *lwp) | |
3772 | { | |
d86d4aaf | 3773 | struct thread_info *thread = get_lwp_thread (lwp); |
d50171e4 PA |
3774 | struct thread_info *saved_inferior; |
3775 | CORE_ADDR pc; | |
3776 | int step; | |
3777 | ||
3778 | if (debug_threads) | |
87ce2a04 | 3779 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 3780 | lwpid_of (thread)); |
d50171e4 | 3781 | |
7984d532 PA |
3782 | stop_all_lwps (1, lwp); |
3783 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3784 | |
3785 | if (debug_threads) | |
87ce2a04 | 3786 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
3787 | |
3788 | /* Note, we should always reach here with an already adjusted PC, | |
3789 | either by GDB (if we're resuming due to GDB's request), or by our | |
3790 | caller, if we just finished handling an internal breakpoint GDB | |
3791 | shouldn't care about. */ | |
3792 | pc = get_pc (lwp); | |
3793 | ||
3794 | saved_inferior = current_inferior; | |
d86d4aaf | 3795 | current_inferior = thread; |
d50171e4 PA |
3796 | |
3797 | lwp->bp_reinsert = pc; | |
3798 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3799 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3800 | |
3801 | if (can_hardware_single_step ()) | |
3802 | { | |
3803 | step = 1; | |
3804 | } | |
3805 | else | |
3806 | { | |
3807 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3808 | set_reinsert_breakpoint (raddr); | |
3809 | step = 0; | |
3810 | } | |
3811 | ||
3812 | current_inferior = saved_inferior; | |
3813 | ||
3814 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3815 | ||
3816 | /* Require next event from this LWP. */ | |
d86d4aaf | 3817 | step_over_bkpt = thread->entry.id; |
d50171e4 PA |
3818 | return 1; |
3819 | } | |
3820 | ||
3821 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3822 | start_step_over, if still there, and delete any reinsert | |
3823 | breakpoints we've set, on non hardware single-step targets. */ | |
3824 | ||
3825 | static int | |
3826 | finish_step_over (struct lwp_info *lwp) | |
3827 | { | |
3828 | if (lwp->bp_reinsert != 0) | |
3829 | { | |
3830 | if (debug_threads) | |
87ce2a04 | 3831 | debug_printf ("Finished step over.\n"); |
d50171e4 PA |
3832 | |
3833 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3834 | may be no breakpoint to reinsert there by now. */ | |
3835 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3836 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3837 | |
3838 | lwp->bp_reinsert = 0; | |
3839 | ||
3840 | /* Delete any software-single-step reinsert breakpoints. No | |
3841 | longer needed. We don't have to worry about other threads | |
3842 | hitting this trap, and later not being able to explain it, | |
3843 | because we were stepping over a breakpoint, and we hold all | |
3844 | threads but LWP stopped while doing that. */ | |
3845 | if (!can_hardware_single_step ()) | |
3846 | delete_reinsert_breakpoints (); | |
3847 | ||
3848 | step_over_bkpt = null_ptid; | |
3849 | return 1; | |
3850 | } | |
3851 | else | |
3852 | return 0; | |
3853 | } | |
3854 | ||
5544ad89 DJ |
3855 | /* This function is called once per thread. We check the thread's resume |
3856 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3857 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3858 | |
bd99dc85 PA |
3859 | For threads which we aren't explicitly told otherwise, we preserve |
3860 | the stepping flag; this is used for stepping over gdbserver-placed | |
3861 | breakpoints. | |
3862 | ||
3863 | If pending_flags was set in any thread, we queue any needed | |
3864 | signals, since we won't actually resume. We already have a pending | |
3865 | event to report, so we don't need to preserve any step requests; | |
3866 | they should be re-issued if necessary. */ | |
3867 | ||
3868 | static int | |
3869 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3870 | { |
d86d4aaf DE |
3871 | struct thread_info *thread = (struct thread_info *) entry; |
3872 | struct lwp_info *lwp = get_thread_lwp (thread); | |
bd99dc85 | 3873 | int step; |
d50171e4 PA |
3874 | int leave_all_stopped = * (int *) arg; |
3875 | int leave_pending; | |
5544ad89 | 3876 | |
2bd7c093 | 3877 | if (lwp->resume == NULL) |
bd99dc85 | 3878 | return 0; |
5544ad89 | 3879 | |
bd99dc85 | 3880 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3881 | { |
bd99dc85 | 3882 | if (debug_threads) |
d86d4aaf | 3883 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
3884 | |
3885 | if (!lwp->stopped) | |
3886 | { | |
3887 | if (debug_threads) | |
d86d4aaf | 3888 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 3889 | |
d50171e4 PA |
3890 | /* Stop the thread, and wait for the event asynchronously, |
3891 | through the event loop. */ | |
02fc4de7 | 3892 | send_sigstop (lwp); |
bd99dc85 PA |
3893 | } |
3894 | else | |
3895 | { | |
3896 | if (debug_threads) | |
87ce2a04 | 3897 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 3898 | lwpid_of (thread)); |
d50171e4 PA |
3899 | |
3900 | /* The LWP may have been stopped in an internal event that | |
3901 | was not meant to be notified back to GDB (e.g., gdbserver | |
3902 | breakpoint), so we should be reporting a stop event in | |
3903 | this case too. */ | |
3904 | ||
3905 | /* If the thread already has a pending SIGSTOP, this is a | |
3906 | no-op. Otherwise, something later will presumably resume | |
3907 | the thread and this will cause it to cancel any pending | |
3908 | operation, due to last_resume_kind == resume_stop. If | |
3909 | the thread already has a pending status to report, we | |
3910 | will still report it the next time we wait - see | |
3911 | status_pending_p_callback. */ | |
1a981360 PA |
3912 | |
3913 | /* If we already have a pending signal to report, then | |
3914 | there's no need to queue a SIGSTOP, as this means we're | |
3915 | midway through moving the LWP out of the jumppad, and we | |
3916 | will report the pending signal as soon as that is | |
3917 | finished. */ | |
3918 | if (lwp->pending_signals_to_report == NULL) | |
3919 | send_sigstop (lwp); | |
bd99dc85 | 3920 | } |
32ca6d61 | 3921 | |
bd99dc85 PA |
3922 | /* For stop requests, we're done. */ |
3923 | lwp->resume = NULL; | |
fc7238bb | 3924 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3925 | return 0; |
5544ad89 DJ |
3926 | } |
3927 | ||
bd99dc85 PA |
3928 | /* If this thread which is about to be resumed has a pending status, |
3929 | then don't resume any threads - we can just report the pending | |
3930 | status. Make sure to queue any signals that would otherwise be | |
3931 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3932 | thread has a pending status. If there's a thread that needs the |
3933 | step-over-breakpoint dance, then don't resume any other thread | |
3934 | but that particular one. */ | |
3935 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3936 | |
d50171e4 | 3937 | if (!leave_pending) |
bd99dc85 PA |
3938 | { |
3939 | if (debug_threads) | |
d86d4aaf | 3940 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 3941 | |
d50171e4 | 3942 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3943 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3944 | } |
3945 | else | |
3946 | { | |
3947 | if (debug_threads) | |
d86d4aaf | 3948 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
5544ad89 | 3949 | |
bd99dc85 PA |
3950 | /* If we have a new signal, enqueue the signal. */ |
3951 | if (lwp->resume->sig != 0) | |
3952 | { | |
3953 | struct pending_signals *p_sig; | |
3954 | p_sig = xmalloc (sizeof (*p_sig)); | |
3955 | p_sig->prev = lwp->pending_signals; | |
3956 | p_sig->signal = lwp->resume->sig; | |
3957 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3958 | ||
3959 | /* If this is the same signal we were previously stopped by, | |
3960 | make sure to queue its siginfo. We can ignore the return | |
3961 | value of ptrace; if it fails, we'll skip | |
3962 | PTRACE_SETSIGINFO. */ | |
3963 | if (WIFSTOPPED (lwp->last_status) | |
3964 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
d86d4aaf | 3965 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3966 | &p_sig->info); |
bd99dc85 PA |
3967 | |
3968 | lwp->pending_signals = p_sig; | |
3969 | } | |
3970 | } | |
5544ad89 | 3971 | |
fc7238bb | 3972 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3973 | lwp->resume = NULL; |
5544ad89 | 3974 | return 0; |
0d62e5e8 DJ |
3975 | } |
3976 | ||
3977 | static void | |
2bd7c093 | 3978 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3979 | { |
2bd7c093 | 3980 | struct thread_resume_array array = { resume_info, n }; |
d86d4aaf | 3981 | struct thread_info *need_step_over = NULL; |
d50171e4 PA |
3982 | int any_pending; |
3983 | int leave_all_stopped; | |
c6ecbae5 | 3984 | |
87ce2a04 DE |
3985 | if (debug_threads) |
3986 | { | |
3987 | debug_enter (); | |
3988 | debug_printf ("linux_resume:\n"); | |
3989 | } | |
3990 | ||
2bd7c093 | 3991 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3992 | |
d50171e4 PA |
3993 | /* If there is a thread which would otherwise be resumed, which has |
3994 | a pending status, then don't resume any threads - we can just | |
3995 | report the pending status. Make sure to queue any signals that | |
3996 | would otherwise be sent. In non-stop mode, we'll apply this | |
3997 | logic to each thread individually. We consume all pending events | |
3998 | before considering to start a step-over (in all-stop). */ | |
3999 | any_pending = 0; | |
bd99dc85 | 4000 | if (!non_stop) |
d86d4aaf | 4001 | find_inferior (&all_threads, resume_status_pending_p, &any_pending); |
d50171e4 PA |
4002 | |
4003 | /* If there is a thread which would otherwise be resumed, which is | |
4004 | stopped at a breakpoint that needs stepping over, then don't | |
4005 | resume any threads - have it step over the breakpoint with all | |
4006 | other threads stopped, then resume all threads again. Make sure | |
4007 | to queue any signals that would otherwise be delivered or | |
4008 | queued. */ | |
4009 | if (!any_pending && supports_breakpoints ()) | |
4010 | need_step_over | |
d86d4aaf DE |
4011 | = (struct thread_info *) find_inferior (&all_threads, |
4012 | need_step_over_p, NULL); | |
d50171e4 PA |
4013 | |
4014 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
4015 | ||
4016 | if (debug_threads) | |
4017 | { | |
4018 | if (need_step_over != NULL) | |
87ce2a04 | 4019 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 4020 | else if (any_pending) |
87ce2a04 DE |
4021 | debug_printf ("Not resuming, all-stop and found " |
4022 | "an LWP with pending status\n"); | |
d50171e4 | 4023 | else |
87ce2a04 | 4024 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4025 | } |
4026 | ||
4027 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4028 | otherwise deliver. */ | |
4029 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
4030 | ||
4031 | if (need_step_over) | |
d86d4aaf | 4032 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4033 | |
4034 | if (debug_threads) | |
4035 | { | |
4036 | debug_printf ("linux_resume done\n"); | |
4037 | debug_exit (); | |
4038 | } | |
d50171e4 PA |
4039 | } |
4040 | ||
4041 | /* This function is called once per thread. We check the thread's | |
4042 | last resume request, which will tell us whether to resume, step, or | |
4043 | leave the thread stopped. Any signal the client requested to be | |
4044 | delivered has already been enqueued at this point. | |
4045 | ||
4046 | If any thread that GDB wants running is stopped at an internal | |
4047 | breakpoint that needs stepping over, we start a step-over operation | |
4048 | on that particular thread, and leave all others stopped. */ | |
4049 | ||
7984d532 PA |
4050 | static int |
4051 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 4052 | { |
d86d4aaf DE |
4053 | struct thread_info *thread = (struct thread_info *) entry; |
4054 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
4055 | int step; |
4056 | ||
7984d532 PA |
4057 | if (lwp == except) |
4058 | return 0; | |
d50171e4 PA |
4059 | |
4060 | if (debug_threads) | |
d86d4aaf | 4061 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4062 | |
4063 | if (!lwp->stopped) | |
4064 | { | |
4065 | if (debug_threads) | |
d86d4aaf | 4066 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
7984d532 | 4067 | return 0; |
d50171e4 PA |
4068 | } |
4069 | ||
02fc4de7 PA |
4070 | if (thread->last_resume_kind == resume_stop |
4071 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4072 | { |
4073 | if (debug_threads) | |
87ce2a04 | 4074 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4075 | lwpid_of (thread)); |
7984d532 | 4076 | return 0; |
d50171e4 PA |
4077 | } |
4078 | ||
4079 | if (lwp->status_pending_p) | |
4080 | { | |
4081 | if (debug_threads) | |
87ce2a04 | 4082 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4083 | lwpid_of (thread)); |
7984d532 | 4084 | return 0; |
d50171e4 PA |
4085 | } |
4086 | ||
7984d532 PA |
4087 | gdb_assert (lwp->suspended >= 0); |
4088 | ||
d50171e4 PA |
4089 | if (lwp->suspended) |
4090 | { | |
4091 | if (debug_threads) | |
d86d4aaf | 4092 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
7984d532 | 4093 | return 0; |
d50171e4 PA |
4094 | } |
4095 | ||
1a981360 PA |
4096 | if (thread->last_resume_kind == resume_stop |
4097 | && lwp->pending_signals_to_report == NULL | |
4098 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
4099 | { |
4100 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4101 | last_status.kind check above would catch it, and we wouldn't | |
4102 | reach here. This LWP may have been momentarily paused by a | |
4103 | stop_all_lwps call while handling for example, another LWP's | |
4104 | step-over. In that case, the pending expected SIGSTOP signal | |
4105 | that was queued at vCont;t handling time will have already | |
4106 | been consumed by wait_for_sigstop, and so we need to requeue | |
4107 | another one here. Note that if the LWP already has a SIGSTOP | |
4108 | pending, this is a no-op. */ | |
4109 | ||
4110 | if (debug_threads) | |
87ce2a04 DE |
4111 | debug_printf ("Client wants LWP %ld to stop. " |
4112 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 4113 | lwpid_of (thread)); |
02fc4de7 PA |
4114 | |
4115 | send_sigstop (lwp); | |
4116 | } | |
4117 | ||
8336d594 | 4118 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 4119 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
4120 | return 0; |
4121 | } | |
4122 | ||
4123 | static int | |
4124 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
4125 | { | |
d86d4aaf DE |
4126 | struct thread_info *thread = (struct thread_info *) entry; |
4127 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
4128 | |
4129 | if (lwp == except) | |
4130 | return 0; | |
4131 | ||
4132 | lwp->suspended--; | |
4133 | gdb_assert (lwp->suspended >= 0); | |
4134 | ||
4135 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
4136 | } |
4137 | ||
4138 | /* When we finish a step-over, set threads running again. If there's | |
4139 | another thread that may need a step-over, now's the time to start | |
4140 | it. Eventually, we'll move all threads past their breakpoints. */ | |
4141 | ||
4142 | static void | |
4143 | proceed_all_lwps (void) | |
4144 | { | |
d86d4aaf | 4145 | struct thread_info *need_step_over; |
d50171e4 PA |
4146 | |
4147 | /* If there is a thread which would otherwise be resumed, which is | |
4148 | stopped at a breakpoint that needs stepping over, then don't | |
4149 | resume any threads - have it step over the breakpoint with all | |
4150 | other threads stopped, then resume all threads again. */ | |
4151 | ||
4152 | if (supports_breakpoints ()) | |
4153 | { | |
4154 | need_step_over | |
d86d4aaf DE |
4155 | = (struct thread_info *) find_inferior (&all_threads, |
4156 | need_step_over_p, NULL); | |
d50171e4 PA |
4157 | |
4158 | if (need_step_over != NULL) | |
4159 | { | |
4160 | if (debug_threads) | |
87ce2a04 DE |
4161 | debug_printf ("proceed_all_lwps: found " |
4162 | "thread %ld needing a step-over\n", | |
4163 | lwpid_of (need_step_over)); | |
d50171e4 | 4164 | |
d86d4aaf | 4165 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
4166 | return; |
4167 | } | |
4168 | } | |
5544ad89 | 4169 | |
d50171e4 | 4170 | if (debug_threads) |
87ce2a04 | 4171 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 4172 | |
d86d4aaf | 4173 | find_inferior (&all_threads, proceed_one_lwp, NULL); |
d50171e4 PA |
4174 | } |
4175 | ||
4176 | /* Stopped LWPs that the client wanted to be running, that don't have | |
4177 | pending statuses, are set to run again, except for EXCEPT, if not | |
4178 | NULL. This undoes a stop_all_lwps call. */ | |
4179 | ||
4180 | static void | |
7984d532 | 4181 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 4182 | { |
5544ad89 DJ |
4183 | if (debug_threads) |
4184 | { | |
87ce2a04 | 4185 | debug_enter (); |
d50171e4 | 4186 | if (except) |
87ce2a04 | 4187 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 4188 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 4189 | else |
87ce2a04 | 4190 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
4191 | } |
4192 | ||
7984d532 | 4193 | if (unsuspend) |
d86d4aaf | 4194 | find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except); |
7984d532 | 4195 | else |
d86d4aaf | 4196 | find_inferior (&all_threads, proceed_one_lwp, except); |
87ce2a04 DE |
4197 | |
4198 | if (debug_threads) | |
4199 | { | |
4200 | debug_printf ("unstop_all_lwps done\n"); | |
4201 | debug_exit (); | |
4202 | } | |
0d62e5e8 DJ |
4203 | } |
4204 | ||
58caa3dc DJ |
4205 | |
4206 | #ifdef HAVE_LINUX_REGSETS | |
4207 | ||
1faeff08 MR |
4208 | #define use_linux_regsets 1 |
4209 | ||
030031ee PA |
4210 | /* Returns true if REGSET has been disabled. */ |
4211 | ||
4212 | static int | |
4213 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
4214 | { | |
4215 | return (info->disabled_regsets != NULL | |
4216 | && info->disabled_regsets[regset - info->regsets]); | |
4217 | } | |
4218 | ||
4219 | /* Disable REGSET. */ | |
4220 | ||
4221 | static void | |
4222 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
4223 | { | |
4224 | int dr_offset; | |
4225 | ||
4226 | dr_offset = regset - info->regsets; | |
4227 | if (info->disabled_regsets == NULL) | |
4228 | info->disabled_regsets = xcalloc (1, info->num_regsets); | |
4229 | info->disabled_regsets[dr_offset] = 1; | |
4230 | } | |
4231 | ||
58caa3dc | 4232 | static int |
3aee8918 PA |
4233 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
4234 | struct regcache *regcache) | |
58caa3dc DJ |
4235 | { |
4236 | struct regset_info *regset; | |
e9d25b98 | 4237 | int saw_general_regs = 0; |
95954743 | 4238 | int pid; |
1570b33e | 4239 | struct iovec iov; |
58caa3dc | 4240 | |
3aee8918 | 4241 | regset = regsets_info->regsets; |
58caa3dc | 4242 | |
d86d4aaf | 4243 | pid = lwpid_of (current_inferior); |
58caa3dc DJ |
4244 | while (regset->size >= 0) |
4245 | { | |
1570b33e L |
4246 | void *buf, *data; |
4247 | int nt_type, res; | |
58caa3dc | 4248 | |
030031ee | 4249 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
58caa3dc DJ |
4250 | { |
4251 | regset ++; | |
4252 | continue; | |
4253 | } | |
4254 | ||
bca929d3 | 4255 | buf = xmalloc (regset->size); |
1570b33e L |
4256 | |
4257 | nt_type = regset->nt_type; | |
4258 | if (nt_type) | |
4259 | { | |
4260 | iov.iov_base = buf; | |
4261 | iov.iov_len = regset->size; | |
4262 | data = (void *) &iov; | |
4263 | } | |
4264 | else | |
4265 | data = buf; | |
4266 | ||
dfb64f85 | 4267 | #ifndef __sparc__ |
f15f9948 | 4268 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4269 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4270 | #else |
1570b33e | 4271 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4272 | #endif |
58caa3dc DJ |
4273 | if (res < 0) |
4274 | { | |
4275 | if (errno == EIO) | |
4276 | { | |
52fa2412 | 4277 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4278 | this process mode. */ |
030031ee | 4279 | disable_regset (regsets_info, regset); |
fdeb2a12 | 4280 | free (buf); |
52fa2412 | 4281 | continue; |
58caa3dc DJ |
4282 | } |
4283 | else | |
4284 | { | |
0d62e5e8 | 4285 | char s[256]; |
95954743 PA |
4286 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4287 | pid); | |
0d62e5e8 | 4288 | perror (s); |
58caa3dc DJ |
4289 | } |
4290 | } | |
e9d25b98 DJ |
4291 | else if (regset->type == GENERAL_REGS) |
4292 | saw_general_regs = 1; | |
442ea881 | 4293 | regset->store_function (regcache, buf); |
58caa3dc | 4294 | regset ++; |
fdeb2a12 | 4295 | free (buf); |
58caa3dc | 4296 | } |
e9d25b98 DJ |
4297 | if (saw_general_regs) |
4298 | return 0; | |
4299 | else | |
4300 | return 1; | |
58caa3dc DJ |
4301 | } |
4302 | ||
4303 | static int | |
3aee8918 PA |
4304 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
4305 | struct regcache *regcache) | |
58caa3dc DJ |
4306 | { |
4307 | struct regset_info *regset; | |
e9d25b98 | 4308 | int saw_general_regs = 0; |
95954743 | 4309 | int pid; |
1570b33e | 4310 | struct iovec iov; |
58caa3dc | 4311 | |
3aee8918 | 4312 | regset = regsets_info->regsets; |
58caa3dc | 4313 | |
d86d4aaf | 4314 | pid = lwpid_of (current_inferior); |
58caa3dc DJ |
4315 | while (regset->size >= 0) |
4316 | { | |
1570b33e L |
4317 | void *buf, *data; |
4318 | int nt_type, res; | |
58caa3dc | 4319 | |
030031ee | 4320 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
58caa3dc DJ |
4321 | { |
4322 | regset ++; | |
4323 | continue; | |
4324 | } | |
4325 | ||
bca929d3 | 4326 | buf = xmalloc (regset->size); |
545587ee DJ |
4327 | |
4328 | /* First fill the buffer with the current register set contents, | |
4329 | in case there are any items in the kernel's regset that are | |
4330 | not in gdbserver's regcache. */ | |
1570b33e L |
4331 | |
4332 | nt_type = regset->nt_type; | |
4333 | if (nt_type) | |
4334 | { | |
4335 | iov.iov_base = buf; | |
4336 | iov.iov_len = regset->size; | |
4337 | data = (void *) &iov; | |
4338 | } | |
4339 | else | |
4340 | data = buf; | |
4341 | ||
dfb64f85 | 4342 | #ifndef __sparc__ |
f15f9948 | 4343 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4344 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4345 | #else |
689cc2ae | 4346 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4347 | #endif |
545587ee DJ |
4348 | |
4349 | if (res == 0) | |
4350 | { | |
4351 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4352 | regset->fill_function (regcache, buf); |
545587ee DJ |
4353 | |
4354 | /* Only now do we write the register set. */ | |
dfb64f85 | 4355 | #ifndef __sparc__ |
f15f9948 | 4356 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 4357 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4358 | #else |
1570b33e | 4359 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4360 | #endif |
545587ee DJ |
4361 | } |
4362 | ||
58caa3dc DJ |
4363 | if (res < 0) |
4364 | { | |
4365 | if (errno == EIO) | |
4366 | { | |
52fa2412 | 4367 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4368 | this process mode. */ |
030031ee | 4369 | disable_regset (regsets_info, regset); |
fdeb2a12 | 4370 | free (buf); |
52fa2412 | 4371 | continue; |
58caa3dc | 4372 | } |
3221518c UW |
4373 | else if (errno == ESRCH) |
4374 | { | |
1b3f6016 PA |
4375 | /* At this point, ESRCH should mean the process is |
4376 | already gone, in which case we simply ignore attempts | |
4377 | to change its registers. See also the related | |
4378 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4379 | free (buf); |
3221518c UW |
4380 | return 0; |
4381 | } | |
58caa3dc DJ |
4382 | else |
4383 | { | |
ce3a066d | 4384 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4385 | } |
4386 | } | |
e9d25b98 DJ |
4387 | else if (regset->type == GENERAL_REGS) |
4388 | saw_general_regs = 1; | |
58caa3dc | 4389 | regset ++; |
09ec9b38 | 4390 | free (buf); |
58caa3dc | 4391 | } |
e9d25b98 DJ |
4392 | if (saw_general_regs) |
4393 | return 0; | |
4394 | else | |
4395 | return 1; | |
58caa3dc DJ |
4396 | } |
4397 | ||
1faeff08 | 4398 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4399 | |
1faeff08 | 4400 | #define use_linux_regsets 0 |
3aee8918 PA |
4401 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
4402 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 4403 | |
58caa3dc | 4404 | #endif |
1faeff08 MR |
4405 | |
4406 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4407 | calls or 0 if it has to be transferred individually. */ | |
4408 | ||
4409 | static int | |
3aee8918 | 4410 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
4411 | { |
4412 | unsigned char mask = 1 << (regno % 8); | |
4413 | size_t index = regno / 8; | |
4414 | ||
4415 | return (use_linux_regsets | |
3aee8918 PA |
4416 | && (regs_info->regset_bitmap == NULL |
4417 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
4418 | } |
4419 | ||
58caa3dc | 4420 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4421 | |
4422 | int | |
3aee8918 | 4423 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
4424 | { |
4425 | int addr; | |
4426 | ||
3aee8918 | 4427 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
4428 | error ("Invalid register number %d.", regnum); |
4429 | ||
3aee8918 | 4430 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
4431 | |
4432 | return addr; | |
4433 | } | |
4434 | ||
4435 | /* Fetch one register. */ | |
4436 | static void | |
3aee8918 PA |
4437 | fetch_register (const struct usrregs_info *usrregs, |
4438 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4439 | { |
4440 | CORE_ADDR regaddr; | |
4441 | int i, size; | |
4442 | char *buf; | |
4443 | int pid; | |
4444 | ||
3aee8918 | 4445 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4446 | return; |
4447 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4448 | return; | |
4449 | ||
3aee8918 | 4450 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4451 | if (regaddr == -1) |
4452 | return; | |
4453 | ||
3aee8918 PA |
4454 | size = ((register_size (regcache->tdesc, regno) |
4455 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4456 | & -sizeof (PTRACE_XFER_TYPE)); |
4457 | buf = alloca (size); | |
4458 | ||
d86d4aaf | 4459 | pid = lwpid_of (current_inferior); |
1faeff08 MR |
4460 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4461 | { | |
4462 | errno = 0; | |
4463 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4464 | ptrace (PTRACE_PEEKUSER, pid, | |
4465 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4466 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4467 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
4468 | regaddr += sizeof (PTRACE_XFER_TYPE); |
4469 | if (errno != 0) | |
4470 | error ("reading register %d: %s", regno, strerror (errno)); | |
4471 | } | |
4472 | ||
4473 | if (the_low_target.supply_ptrace_register) | |
4474 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4475 | else | |
4476 | supply_register (regcache, regno, buf); | |
4477 | } | |
4478 | ||
4479 | /* Store one register. */ | |
4480 | static void | |
3aee8918 PA |
4481 | store_register (const struct usrregs_info *usrregs, |
4482 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4483 | { |
4484 | CORE_ADDR regaddr; | |
4485 | int i, size; | |
4486 | char *buf; | |
4487 | int pid; | |
4488 | ||
3aee8918 | 4489 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4490 | return; |
4491 | if ((*the_low_target.cannot_store_register) (regno)) | |
4492 | return; | |
4493 | ||
3aee8918 | 4494 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4495 | if (regaddr == -1) |
4496 | return; | |
4497 | ||
3aee8918 PA |
4498 | size = ((register_size (regcache->tdesc, regno) |
4499 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4500 | & -sizeof (PTRACE_XFER_TYPE)); |
4501 | buf = alloca (size); | |
4502 | memset (buf, 0, size); | |
4503 | ||
4504 | if (the_low_target.collect_ptrace_register) | |
4505 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4506 | else | |
4507 | collect_register (regcache, regno, buf); | |
4508 | ||
d86d4aaf | 4509 | pid = lwpid_of (current_inferior); |
1faeff08 MR |
4510 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4511 | { | |
4512 | errno = 0; | |
4513 | ptrace (PTRACE_POKEUSER, pid, | |
4514 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4515 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4516 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
4517 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
4518 | if (errno != 0) |
4519 | { | |
4520 | /* At this point, ESRCH should mean the process is | |
4521 | already gone, in which case we simply ignore attempts | |
4522 | to change its registers. See also the related | |
4523 | comment in linux_resume_one_lwp. */ | |
4524 | if (errno == ESRCH) | |
4525 | return; | |
4526 | ||
4527 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4528 | error ("writing register %d: %s", regno, strerror (errno)); | |
4529 | } | |
4530 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4531 | } | |
4532 | } | |
4533 | ||
4534 | /* Fetch all registers, or just one, from the child process. | |
4535 | If REGNO is -1, do this for all registers, skipping any that are | |
4536 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4537 | unless ALL is non-zero. | |
4538 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4539 | static void | |
3aee8918 PA |
4540 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
4541 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4542 | { |
3aee8918 PA |
4543 | struct usrregs_info *usr = regs_info->usrregs; |
4544 | ||
1faeff08 MR |
4545 | if (regno == -1) |
4546 | { | |
3aee8918 PA |
4547 | for (regno = 0; regno < usr->num_regs; regno++) |
4548 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4549 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
4550 | } |
4551 | else | |
3aee8918 | 4552 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
4553 | } |
4554 | ||
4555 | /* Store our register values back into the inferior. | |
4556 | If REGNO is -1, do this for all registers, skipping any that are | |
4557 | assumed to have been saved by regsets_store_inferior_registers, | |
4558 | unless ALL is non-zero. | |
4559 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4560 | static void | |
3aee8918 PA |
4561 | usr_store_inferior_registers (const struct regs_info *regs_info, |
4562 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4563 | { |
3aee8918 PA |
4564 | struct usrregs_info *usr = regs_info->usrregs; |
4565 | ||
1faeff08 MR |
4566 | if (regno == -1) |
4567 | { | |
3aee8918 PA |
4568 | for (regno = 0; regno < usr->num_regs; regno++) |
4569 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4570 | store_register (usr, regcache, regno); | |
1faeff08 MR |
4571 | } |
4572 | else | |
3aee8918 | 4573 | store_register (usr, regcache, regno); |
1faeff08 MR |
4574 | } |
4575 | ||
4576 | #else /* !HAVE_LINUX_USRREGS */ | |
4577 | ||
3aee8918 PA |
4578 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
4579 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 4580 | |
58caa3dc | 4581 | #endif |
1faeff08 MR |
4582 | |
4583 | ||
4584 | void | |
4585 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4586 | { | |
4587 | int use_regsets; | |
4588 | int all = 0; | |
3aee8918 | 4589 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4590 | |
4591 | if (regno == -1) | |
4592 | { | |
3aee8918 PA |
4593 | if (the_low_target.fetch_register != NULL |
4594 | && regs_info->usrregs != NULL) | |
4595 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
4596 | (*the_low_target.fetch_register) (regcache, regno); |
4597 | ||
3aee8918 PA |
4598 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
4599 | if (regs_info->usrregs != NULL) | |
4600 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
4601 | } |
4602 | else | |
4603 | { | |
c14dfd32 PA |
4604 | if (the_low_target.fetch_register != NULL |
4605 | && (*the_low_target.fetch_register) (regcache, regno)) | |
4606 | return; | |
4607 | ||
3aee8918 | 4608 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4609 | if (use_regsets) |
3aee8918 PA |
4610 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
4611 | regcache); | |
4612 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4613 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4614 | } |
58caa3dc DJ |
4615 | } |
4616 | ||
4617 | void | |
442ea881 | 4618 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 4619 | { |
1faeff08 MR |
4620 | int use_regsets; |
4621 | int all = 0; | |
3aee8918 | 4622 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4623 | |
4624 | if (regno == -1) | |
4625 | { | |
3aee8918 PA |
4626 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4627 | regcache); | |
4628 | if (regs_info->usrregs != NULL) | |
4629 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
4630 | } |
4631 | else | |
4632 | { | |
3aee8918 | 4633 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4634 | if (use_regsets) |
3aee8918 PA |
4635 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4636 | regcache); | |
4637 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4638 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4639 | } |
58caa3dc DJ |
4640 | } |
4641 | ||
da6d8c04 | 4642 | |
da6d8c04 DJ |
4643 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4644 | to debugger memory starting at MYADDR. */ | |
4645 | ||
c3e735a6 | 4646 | static int |
f450004a | 4647 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 4648 | { |
d86d4aaf | 4649 | int pid = lwpid_of (current_inferior); |
4934b29e MR |
4650 | register PTRACE_XFER_TYPE *buffer; |
4651 | register CORE_ADDR addr; | |
4652 | register int count; | |
4653 | char filename[64]; | |
da6d8c04 | 4654 | register int i; |
4934b29e | 4655 | int ret; |
fd462a61 | 4656 | int fd; |
fd462a61 DJ |
4657 | |
4658 | /* Try using /proc. Don't bother for one word. */ | |
4659 | if (len >= 3 * sizeof (long)) | |
4660 | { | |
4934b29e MR |
4661 | int bytes; |
4662 | ||
fd462a61 DJ |
4663 | /* We could keep this file open and cache it - possibly one per |
4664 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4665 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4666 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4667 | if (fd == -1) | |
4668 | goto no_proc; | |
4669 | ||
4670 | /* If pread64 is available, use it. It's faster if the kernel | |
4671 | supports it (only one syscall), and it's 64-bit safe even on | |
4672 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4673 | application). */ | |
4674 | #ifdef HAVE_PREAD64 | |
4934b29e | 4675 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 4676 | #else |
4934b29e MR |
4677 | bytes = -1; |
4678 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
4679 | bytes = read (fd, myaddr, len); | |
fd462a61 | 4680 | #endif |
fd462a61 DJ |
4681 | |
4682 | close (fd); | |
4934b29e MR |
4683 | if (bytes == len) |
4684 | return 0; | |
4685 | ||
4686 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
4687 | if (bytes > 0) | |
4688 | { | |
4689 | memaddr += bytes; | |
4690 | myaddr += bytes; | |
4691 | len -= bytes; | |
4692 | } | |
fd462a61 | 4693 | } |
da6d8c04 | 4694 | |
fd462a61 | 4695 | no_proc: |
4934b29e MR |
4696 | /* Round starting address down to longword boundary. */ |
4697 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4698 | /* Round ending address up; get number of longwords that makes. */ | |
4699 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4700 | / sizeof (PTRACE_XFER_TYPE)); | |
4701 | /* Allocate buffer of that many longwords. */ | |
4702 | buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4703 | ||
da6d8c04 | 4704 | /* Read all the longwords */ |
4934b29e | 4705 | errno = 0; |
da6d8c04 DJ |
4706 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
4707 | { | |
14ce3065 DE |
4708 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4709 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4710 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
4711 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4712 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 4713 | if (errno) |
4934b29e | 4714 | break; |
da6d8c04 | 4715 | } |
4934b29e | 4716 | ret = errno; |
da6d8c04 DJ |
4717 | |
4718 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
4719 | if (i > 0) |
4720 | { | |
4721 | i *= sizeof (PTRACE_XFER_TYPE); | |
4722 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
4723 | memcpy (myaddr, | |
4724 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4725 | i < len ? i : len); | |
4726 | } | |
c3e735a6 | 4727 | |
4934b29e | 4728 | return ret; |
da6d8c04 DJ |
4729 | } |
4730 | ||
93ae6fdc PA |
4731 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4732 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 4733 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 4734 | |
ce3a066d | 4735 | static int |
f450004a | 4736 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4737 | { |
4738 | register int i; | |
4739 | /* Round starting address down to longword boundary. */ | |
4740 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4741 | /* Round ending address up; get number of longwords that makes. */ | |
4742 | register int count | |
493e2a69 MS |
4743 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4744 | / sizeof (PTRACE_XFER_TYPE); | |
4745 | ||
da6d8c04 | 4746 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4747 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4748 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4749 | ||
d86d4aaf | 4750 | int pid = lwpid_of (current_inferior); |
da6d8c04 | 4751 | |
f0ae6fc3 PA |
4752 | if (len == 0) |
4753 | { | |
4754 | /* Zero length write always succeeds. */ | |
4755 | return 0; | |
4756 | } | |
4757 | ||
0d62e5e8 DJ |
4758 | if (debug_threads) |
4759 | { | |
58d6951d DJ |
4760 | /* Dump up to four bytes. */ |
4761 | unsigned int val = * (unsigned int *) myaddr; | |
4762 | if (len == 1) | |
4763 | val = val & 0xff; | |
4764 | else if (len == 2) | |
4765 | val = val & 0xffff; | |
4766 | else if (len == 3) | |
4767 | val = val & 0xffffff; | |
87ce2a04 DE |
4768 | debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), |
4769 | val, (long)memaddr); | |
0d62e5e8 DJ |
4770 | } |
4771 | ||
da6d8c04 DJ |
4772 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4773 | ||
93ae6fdc | 4774 | errno = 0; |
14ce3065 DE |
4775 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4776 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4777 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
4778 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4779 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
4780 | if (errno) |
4781 | return errno; | |
da6d8c04 DJ |
4782 | |
4783 | if (count > 1) | |
4784 | { | |
93ae6fdc | 4785 | errno = 0; |
da6d8c04 | 4786 | buffer[count - 1] |
95954743 | 4787 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4788 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4789 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4790 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 4791 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 4792 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
4793 | if (errno) |
4794 | return errno; | |
da6d8c04 DJ |
4795 | } |
4796 | ||
93ae6fdc | 4797 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4798 | |
493e2a69 MS |
4799 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4800 | myaddr, len); | |
da6d8c04 DJ |
4801 | |
4802 | /* Write the entire buffer. */ | |
4803 | ||
4804 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4805 | { | |
4806 | errno = 0; | |
14ce3065 DE |
4807 | ptrace (PTRACE_POKETEXT, pid, |
4808 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4809 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4810 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4811 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
4812 | if (errno) |
4813 | return errno; | |
4814 | } | |
4815 | ||
4816 | return 0; | |
4817 | } | |
2f2893d9 DJ |
4818 | |
4819 | static void | |
4820 | linux_look_up_symbols (void) | |
4821 | { | |
0d62e5e8 | 4822 | #ifdef USE_THREAD_DB |
95954743 PA |
4823 | struct process_info *proc = current_process (); |
4824 | ||
cdbfd419 | 4825 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4826 | return; |
4827 | ||
96d7229d LM |
4828 | /* If the kernel supports tracing clones, then we don't need to |
4829 | use the magic thread event breakpoint to learn about | |
4830 | threads. */ | |
4831 | thread_db_init (!linux_supports_traceclone ()); | |
0d62e5e8 DJ |
4832 | #endif |
4833 | } | |
4834 | ||
e5379b03 | 4835 | static void |
ef57601b | 4836 | linux_request_interrupt (void) |
e5379b03 | 4837 | { |
a1928bad | 4838 | extern unsigned long signal_pid; |
e5379b03 | 4839 | |
95954743 PA |
4840 | if (!ptid_equal (cont_thread, null_ptid) |
4841 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 4842 | { |
bd99dc85 | 4843 | int lwpid; |
e5379b03 | 4844 | |
d86d4aaf | 4845 | lwpid = lwpid_of (current_inferior); |
bd99dc85 | 4846 | kill_lwp (lwpid, SIGINT); |
e5379b03 DJ |
4847 | } |
4848 | else | |
ef57601b | 4849 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
4850 | } |
4851 | ||
aa691b87 RM |
4852 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4853 | to debugger memory starting at MYADDR. */ | |
4854 | ||
4855 | static int | |
f450004a | 4856 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4857 | { |
4858 | char filename[PATH_MAX]; | |
4859 | int fd, n; | |
d86d4aaf | 4860 | int pid = lwpid_of (current_inferior); |
aa691b87 | 4861 | |
6cebaf6e | 4862 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4863 | |
4864 | fd = open (filename, O_RDONLY); | |
4865 | if (fd < 0) | |
4866 | return -1; | |
4867 | ||
4868 | if (offset != (CORE_ADDR) 0 | |
4869 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4870 | n = -1; | |
4871 | else | |
4872 | n = read (fd, myaddr, len); | |
4873 | ||
4874 | close (fd); | |
4875 | ||
4876 | return n; | |
4877 | } | |
4878 | ||
d993e290 PA |
4879 | /* These breakpoint and watchpoint related wrapper functions simply |
4880 | pass on the function call if the target has registered a | |
4881 | corresponding function. */ | |
e013ee27 OF |
4882 | |
4883 | static int | |
802e8e6d PA |
4884 | linux_supports_z_point_type (char z_type) |
4885 | { | |
4886 | return (the_low_target.supports_z_point_type != NULL | |
4887 | && the_low_target.supports_z_point_type (z_type)); | |
4888 | } | |
4889 | ||
4890 | static int | |
4891 | linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
4892 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 4893 | { |
d993e290 | 4894 | if (the_low_target.insert_point != NULL) |
802e8e6d | 4895 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
4896 | else |
4897 | /* Unsupported (see target.h). */ | |
4898 | return 1; | |
4899 | } | |
4900 | ||
4901 | static int | |
802e8e6d PA |
4902 | linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
4903 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 4904 | { |
d993e290 | 4905 | if (the_low_target.remove_point != NULL) |
802e8e6d | 4906 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
4907 | else |
4908 | /* Unsupported (see target.h). */ | |
4909 | return 1; | |
4910 | } | |
4911 | ||
4912 | static int | |
4913 | linux_stopped_by_watchpoint (void) | |
4914 | { | |
c3adc08c PA |
4915 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4916 | ||
4917 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
4918 | } |
4919 | ||
4920 | static CORE_ADDR | |
4921 | linux_stopped_data_address (void) | |
4922 | { | |
c3adc08c PA |
4923 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4924 | ||
4925 | return lwp->stopped_data_address; | |
e013ee27 OF |
4926 | } |
4927 | ||
db0dfaa0 LM |
4928 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
4929 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
4930 | && defined(PT_TEXT_END_ADDR) | |
4931 | ||
4932 | /* This is only used for targets that define PT_TEXT_ADDR, | |
4933 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
4934 | the target has different ways of acquiring this information, like | |
4935 | loadmaps. */ | |
52fb6437 NS |
4936 | |
4937 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4938 | to tell gdb about. */ | |
4939 | ||
4940 | static int | |
4941 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4942 | { | |
52fb6437 | 4943 | unsigned long text, text_end, data; |
bd99dc85 | 4944 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
4945 | |
4946 | errno = 0; | |
4947 | ||
b8e1b30e LM |
4948 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
4949 | (PTRACE_TYPE_ARG4) 0); | |
4950 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
4951 | (PTRACE_TYPE_ARG4) 0); | |
4952 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
4953 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
4954 | |
4955 | if (errno == 0) | |
4956 | { | |
4957 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4958 | used by gdb) are relative to the beginning of the program, |
4959 | with the data segment immediately following the text segment. | |
4960 | However, the actual runtime layout in memory may put the data | |
4961 | somewhere else, so when we send gdb a data base-address, we | |
4962 | use the real data base address and subtract the compile-time | |
4963 | data base-address from it (which is just the length of the | |
4964 | text segment). BSS immediately follows data in both | |
4965 | cases. */ | |
52fb6437 NS |
4966 | *text_p = text; |
4967 | *data_p = data - (text_end - text); | |
1b3f6016 | 4968 | |
52fb6437 NS |
4969 | return 1; |
4970 | } | |
52fb6437 NS |
4971 | return 0; |
4972 | } | |
4973 | #endif | |
4974 | ||
07e059b5 VP |
4975 | static int |
4976 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4977 | unsigned char *readbuf, unsigned const char *writebuf, |
4978 | CORE_ADDR offset, int len) | |
07e059b5 | 4979 | { |
d26e3629 | 4980 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4981 | } |
4982 | ||
d0722149 DE |
4983 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4984 | layout of the inferiors' architecture. */ | |
4985 | ||
4986 | static void | |
a5362b9a | 4987 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
4988 | { |
4989 | int done = 0; | |
4990 | ||
4991 | if (the_low_target.siginfo_fixup != NULL) | |
4992 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4993 | ||
4994 | /* If there was no callback, or the callback didn't do anything, | |
4995 | then just do a straight memcpy. */ | |
4996 | if (!done) | |
4997 | { | |
4998 | if (direction == 1) | |
a5362b9a | 4999 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 5000 | else |
a5362b9a | 5001 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
5002 | } |
5003 | } | |
5004 | ||
4aa995e1 PA |
5005 | static int |
5006 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
5007 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
5008 | { | |
d0722149 | 5009 | int pid; |
a5362b9a TS |
5010 | siginfo_t siginfo; |
5011 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 PA |
5012 | |
5013 | if (current_inferior == NULL) | |
5014 | return -1; | |
5015 | ||
d86d4aaf | 5016 | pid = lwpid_of (current_inferior); |
4aa995e1 PA |
5017 | |
5018 | if (debug_threads) | |
87ce2a04 DE |
5019 | debug_printf ("%s siginfo for lwp %d.\n", |
5020 | readbuf != NULL ? "Reading" : "Writing", | |
5021 | pid); | |
4aa995e1 | 5022 | |
0adea5f7 | 5023 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
5024 | return -1; |
5025 | ||
b8e1b30e | 5026 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5027 | return -1; |
5028 | ||
d0722149 DE |
5029 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
5030 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
5031 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
5032 | with a 32-bit GDBSERVER, we need to convert it. */ | |
5033 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
5034 | ||
4aa995e1 PA |
5035 | if (offset + len > sizeof (siginfo)) |
5036 | len = sizeof (siginfo) - offset; | |
5037 | ||
5038 | if (readbuf != NULL) | |
d0722149 | 5039 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
5040 | else |
5041 | { | |
d0722149 DE |
5042 | memcpy (inf_siginfo + offset, writebuf, len); |
5043 | ||
5044 | /* Convert back to ptrace layout before flushing it out. */ | |
5045 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
5046 | ||
b8e1b30e | 5047 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5048 | return -1; |
5049 | } | |
5050 | ||
5051 | return len; | |
5052 | } | |
5053 | ||
bd99dc85 PA |
5054 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5055 | so we notice when children change state; as the handler for the | |
5056 | sigsuspend in my_waitpid. */ | |
5057 | ||
5058 | static void | |
5059 | sigchld_handler (int signo) | |
5060 | { | |
5061 | int old_errno = errno; | |
5062 | ||
5063 | if (debug_threads) | |
e581f2b4 PA |
5064 | { |
5065 | do | |
5066 | { | |
5067 | /* fprintf is not async-signal-safe, so call write | |
5068 | directly. */ | |
5069 | if (write (2, "sigchld_handler\n", | |
5070 | sizeof ("sigchld_handler\n") - 1) < 0) | |
5071 | break; /* just ignore */ | |
5072 | } while (0); | |
5073 | } | |
bd99dc85 PA |
5074 | |
5075 | if (target_is_async_p ()) | |
5076 | async_file_mark (); /* trigger a linux_wait */ | |
5077 | ||
5078 | errno = old_errno; | |
5079 | } | |
5080 | ||
5081 | static int | |
5082 | linux_supports_non_stop (void) | |
5083 | { | |
5084 | return 1; | |
5085 | } | |
5086 | ||
5087 | static int | |
5088 | linux_async (int enable) | |
5089 | { | |
7089dca4 | 5090 | int previous = target_is_async_p (); |
bd99dc85 | 5091 | |
8336d594 | 5092 | if (debug_threads) |
87ce2a04 DE |
5093 | debug_printf ("linux_async (%d), previous=%d\n", |
5094 | enable, previous); | |
8336d594 | 5095 | |
bd99dc85 PA |
5096 | if (previous != enable) |
5097 | { | |
5098 | sigset_t mask; | |
5099 | sigemptyset (&mask); | |
5100 | sigaddset (&mask, SIGCHLD); | |
5101 | ||
5102 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
5103 | ||
5104 | if (enable) | |
5105 | { | |
5106 | if (pipe (linux_event_pipe) == -1) | |
5107 | fatal ("creating event pipe failed."); | |
5108 | ||
5109 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5110 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5111 | ||
5112 | /* Register the event loop handler. */ | |
5113 | add_file_handler (linux_event_pipe[0], | |
5114 | handle_target_event, NULL); | |
5115 | ||
5116 | /* Always trigger a linux_wait. */ | |
5117 | async_file_mark (); | |
5118 | } | |
5119 | else | |
5120 | { | |
5121 | delete_file_handler (linux_event_pipe[0]); | |
5122 | ||
5123 | close (linux_event_pipe[0]); | |
5124 | close (linux_event_pipe[1]); | |
5125 | linux_event_pipe[0] = -1; | |
5126 | linux_event_pipe[1] = -1; | |
5127 | } | |
5128 | ||
5129 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5130 | } | |
5131 | ||
5132 | return previous; | |
5133 | } | |
5134 | ||
5135 | static int | |
5136 | linux_start_non_stop (int nonstop) | |
5137 | { | |
5138 | /* Register or unregister from event-loop accordingly. */ | |
5139 | linux_async (nonstop); | |
5140 | return 0; | |
5141 | } | |
5142 | ||
cf8fd78b PA |
5143 | static int |
5144 | linux_supports_multi_process (void) | |
5145 | { | |
5146 | return 1; | |
5147 | } | |
5148 | ||
03583c20 UW |
5149 | static int |
5150 | linux_supports_disable_randomization (void) | |
5151 | { | |
5152 | #ifdef HAVE_PERSONALITY | |
5153 | return 1; | |
5154 | #else | |
5155 | return 0; | |
5156 | #endif | |
5157 | } | |
efcbbd14 | 5158 | |
d1feda86 YQ |
5159 | static int |
5160 | linux_supports_agent (void) | |
5161 | { | |
5162 | return 1; | |
5163 | } | |
5164 | ||
c2d6af84 PA |
5165 | static int |
5166 | linux_supports_range_stepping (void) | |
5167 | { | |
5168 | if (*the_low_target.supports_range_stepping == NULL) | |
5169 | return 0; | |
5170 | ||
5171 | return (*the_low_target.supports_range_stepping) (); | |
5172 | } | |
5173 | ||
efcbbd14 UW |
5174 | /* Enumerate spufs IDs for process PID. */ |
5175 | static int | |
5176 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
5177 | { | |
5178 | int pos = 0; | |
5179 | int written = 0; | |
5180 | char path[128]; | |
5181 | DIR *dir; | |
5182 | struct dirent *entry; | |
5183 | ||
5184 | sprintf (path, "/proc/%ld/fd", pid); | |
5185 | dir = opendir (path); | |
5186 | if (!dir) | |
5187 | return -1; | |
5188 | ||
5189 | rewinddir (dir); | |
5190 | while ((entry = readdir (dir)) != NULL) | |
5191 | { | |
5192 | struct stat st; | |
5193 | struct statfs stfs; | |
5194 | int fd; | |
5195 | ||
5196 | fd = atoi (entry->d_name); | |
5197 | if (!fd) | |
5198 | continue; | |
5199 | ||
5200 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
5201 | if (stat (path, &st) != 0) | |
5202 | continue; | |
5203 | if (!S_ISDIR (st.st_mode)) | |
5204 | continue; | |
5205 | ||
5206 | if (statfs (path, &stfs) != 0) | |
5207 | continue; | |
5208 | if (stfs.f_type != SPUFS_MAGIC) | |
5209 | continue; | |
5210 | ||
5211 | if (pos >= offset && pos + 4 <= offset + len) | |
5212 | { | |
5213 | *(unsigned int *)(buf + pos - offset) = fd; | |
5214 | written += 4; | |
5215 | } | |
5216 | pos += 4; | |
5217 | } | |
5218 | ||
5219 | closedir (dir); | |
5220 | return written; | |
5221 | } | |
5222 | ||
5223 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5224 | object type, using the /proc file system. */ | |
5225 | static int | |
5226 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
5227 | unsigned const char *writebuf, | |
5228 | CORE_ADDR offset, int len) | |
5229 | { | |
d86d4aaf | 5230 | long pid = lwpid_of (current_inferior); |
efcbbd14 UW |
5231 | char buf[128]; |
5232 | int fd = 0; | |
5233 | int ret = 0; | |
5234 | ||
5235 | if (!writebuf && !readbuf) | |
5236 | return -1; | |
5237 | ||
5238 | if (!*annex) | |
5239 | { | |
5240 | if (!readbuf) | |
5241 | return -1; | |
5242 | else | |
5243 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5244 | } | |
5245 | ||
5246 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5247 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5248 | if (fd <= 0) | |
5249 | return -1; | |
5250 | ||
5251 | if (offset != 0 | |
5252 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5253 | { | |
5254 | close (fd); | |
5255 | return 0; | |
5256 | } | |
5257 | ||
5258 | if (writebuf) | |
5259 | ret = write (fd, writebuf, (size_t) len); | |
5260 | else | |
5261 | ret = read (fd, readbuf, (size_t) len); | |
5262 | ||
5263 | close (fd); | |
5264 | return ret; | |
5265 | } | |
5266 | ||
723b724b | 5267 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5268 | struct target_loadseg |
5269 | { | |
5270 | /* Core address to which the segment is mapped. */ | |
5271 | Elf32_Addr addr; | |
5272 | /* VMA recorded in the program header. */ | |
5273 | Elf32_Addr p_vaddr; | |
5274 | /* Size of this segment in memory. */ | |
5275 | Elf32_Word p_memsz; | |
5276 | }; | |
5277 | ||
723b724b | 5278 | # if defined PT_GETDSBT |
78d85199 YQ |
5279 | struct target_loadmap |
5280 | { | |
5281 | /* Protocol version number, must be zero. */ | |
5282 | Elf32_Word version; | |
5283 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5284 | unsigned *dsbt_table; | |
5285 | unsigned dsbt_size, dsbt_index; | |
5286 | /* Number of segments in this map. */ | |
5287 | Elf32_Word nsegs; | |
5288 | /* The actual memory map. */ | |
5289 | struct target_loadseg segs[/*nsegs*/]; | |
5290 | }; | |
723b724b MF |
5291 | # define LINUX_LOADMAP PT_GETDSBT |
5292 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5293 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5294 | # else | |
5295 | struct target_loadmap | |
5296 | { | |
5297 | /* Protocol version number, must be zero. */ | |
5298 | Elf32_Half version; | |
5299 | /* Number of segments in this map. */ | |
5300 | Elf32_Half nsegs; | |
5301 | /* The actual memory map. */ | |
5302 | struct target_loadseg segs[/*nsegs*/]; | |
5303 | }; | |
5304 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5305 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5306 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5307 | # endif | |
78d85199 | 5308 | |
78d85199 YQ |
5309 | static int |
5310 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5311 | unsigned char *myaddr, unsigned int len) | |
5312 | { | |
2eec7d5b | 5313 | int pid = lwpid_of (current_inferior); |
78d85199 YQ |
5314 | int addr = -1; |
5315 | struct target_loadmap *data = NULL; | |
5316 | unsigned int actual_length, copy_length; | |
5317 | ||
5318 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5319 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5320 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5321 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5322 | else |
5323 | return -1; | |
5324 | ||
723b724b | 5325 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5326 | return -1; |
5327 | ||
5328 | if (data == NULL) | |
5329 | return -1; | |
5330 | ||
5331 | actual_length = sizeof (struct target_loadmap) | |
5332 | + sizeof (struct target_loadseg) * data->nsegs; | |
5333 | ||
5334 | if (offset < 0 || offset > actual_length) | |
5335 | return -1; | |
5336 | ||
5337 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5338 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5339 | return copy_length; | |
5340 | } | |
723b724b MF |
5341 | #else |
5342 | # define linux_read_loadmap NULL | |
5343 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5344 | |
1570b33e L |
5345 | static void |
5346 | linux_process_qsupported (const char *query) | |
5347 | { | |
5348 | if (the_low_target.process_qsupported != NULL) | |
5349 | the_low_target.process_qsupported (query); | |
5350 | } | |
5351 | ||
219f2f23 PA |
5352 | static int |
5353 | linux_supports_tracepoints (void) | |
5354 | { | |
5355 | if (*the_low_target.supports_tracepoints == NULL) | |
5356 | return 0; | |
5357 | ||
5358 | return (*the_low_target.supports_tracepoints) (); | |
5359 | } | |
5360 | ||
5361 | static CORE_ADDR | |
5362 | linux_read_pc (struct regcache *regcache) | |
5363 | { | |
5364 | if (the_low_target.get_pc == NULL) | |
5365 | return 0; | |
5366 | ||
5367 | return (*the_low_target.get_pc) (regcache); | |
5368 | } | |
5369 | ||
5370 | static void | |
5371 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5372 | { | |
5373 | gdb_assert (the_low_target.set_pc != NULL); | |
5374 | ||
5375 | (*the_low_target.set_pc) (regcache, pc); | |
5376 | } | |
5377 | ||
8336d594 PA |
5378 | static int |
5379 | linux_thread_stopped (struct thread_info *thread) | |
5380 | { | |
5381 | return get_thread_lwp (thread)->stopped; | |
5382 | } | |
5383 | ||
5384 | /* This exposes stop-all-threads functionality to other modules. */ | |
5385 | ||
5386 | static void | |
7984d532 | 5387 | linux_pause_all (int freeze) |
8336d594 | 5388 | { |
7984d532 PA |
5389 | stop_all_lwps (freeze, NULL); |
5390 | } | |
5391 | ||
5392 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5393 | modules. */ | |
5394 | ||
5395 | static void | |
5396 | linux_unpause_all (int unfreeze) | |
5397 | { | |
5398 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5399 | } |
5400 | ||
90d74c30 PA |
5401 | static int |
5402 | linux_prepare_to_access_memory (void) | |
5403 | { | |
5404 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5405 | running LWP. */ | |
5406 | if (non_stop) | |
5407 | linux_pause_all (1); | |
5408 | return 0; | |
5409 | } | |
5410 | ||
5411 | static void | |
0146f85b | 5412 | linux_done_accessing_memory (void) |
90d74c30 PA |
5413 | { |
5414 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5415 | running LWP. */ | |
5416 | if (non_stop) | |
5417 | linux_unpause_all (1); | |
5418 | } | |
5419 | ||
fa593d66 PA |
5420 | static int |
5421 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5422 | CORE_ADDR collector, | |
5423 | CORE_ADDR lockaddr, | |
5424 | ULONGEST orig_size, | |
5425 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5426 | CORE_ADDR *trampoline, |
5427 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5428 | unsigned char *jjump_pad_insn, |
5429 | ULONGEST *jjump_pad_insn_size, | |
5430 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5431 | CORE_ADDR *adjusted_insn_addr_end, |
5432 | char *err) | |
fa593d66 PA |
5433 | { |
5434 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5435 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5436 | jump_entry, trampoline, trampoline_size, |
5437 | jjump_pad_insn, jjump_pad_insn_size, | |
5438 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5439 | err); | |
fa593d66 PA |
5440 | } |
5441 | ||
6a271cae PA |
5442 | static struct emit_ops * |
5443 | linux_emit_ops (void) | |
5444 | { | |
5445 | if (the_low_target.emit_ops != NULL) | |
5446 | return (*the_low_target.emit_ops) (); | |
5447 | else | |
5448 | return NULL; | |
5449 | } | |
5450 | ||
405f8e94 SS |
5451 | static int |
5452 | linux_get_min_fast_tracepoint_insn_len (void) | |
5453 | { | |
5454 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5455 | } | |
5456 | ||
2268b414 JK |
5457 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5458 | ||
5459 | static int | |
5460 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5461 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5462 | { | |
5463 | char filename[PATH_MAX]; | |
5464 | int fd; | |
5465 | const int auxv_size = is_elf64 | |
5466 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5467 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5468 | ||
5469 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5470 | ||
5471 | fd = open (filename, O_RDONLY); | |
5472 | if (fd < 0) | |
5473 | return 1; | |
5474 | ||
5475 | *phdr_memaddr = 0; | |
5476 | *num_phdr = 0; | |
5477 | while (read (fd, buf, auxv_size) == auxv_size | |
5478 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5479 | { | |
5480 | if (is_elf64) | |
5481 | { | |
5482 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5483 | ||
5484 | switch (aux->a_type) | |
5485 | { | |
5486 | case AT_PHDR: | |
5487 | *phdr_memaddr = aux->a_un.a_val; | |
5488 | break; | |
5489 | case AT_PHNUM: | |
5490 | *num_phdr = aux->a_un.a_val; | |
5491 | break; | |
5492 | } | |
5493 | } | |
5494 | else | |
5495 | { | |
5496 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5497 | ||
5498 | switch (aux->a_type) | |
5499 | { | |
5500 | case AT_PHDR: | |
5501 | *phdr_memaddr = aux->a_un.a_val; | |
5502 | break; | |
5503 | case AT_PHNUM: | |
5504 | *num_phdr = aux->a_un.a_val; | |
5505 | break; | |
5506 | } | |
5507 | } | |
5508 | } | |
5509 | ||
5510 | close (fd); | |
5511 | ||
5512 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5513 | { | |
5514 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5515 | "phdr_memaddr = %ld, phdr_num = %d", | |
5516 | (long) *phdr_memaddr, *num_phdr); | |
5517 | return 2; | |
5518 | } | |
5519 | ||
5520 | return 0; | |
5521 | } | |
5522 | ||
5523 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5524 | ||
5525 | static CORE_ADDR | |
5526 | get_dynamic (const int pid, const int is_elf64) | |
5527 | { | |
5528 | CORE_ADDR phdr_memaddr, relocation; | |
5529 | int num_phdr, i; | |
5530 | unsigned char *phdr_buf; | |
5531 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5532 | ||
5533 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5534 | return 0; | |
5535 | ||
5536 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5537 | phdr_buf = alloca (num_phdr * phdr_size); | |
5538 | ||
5539 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5540 | return 0; | |
5541 | ||
5542 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5543 | non-zero for PIE ones. */ | |
5544 | relocation = -1; | |
5545 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5546 | if (is_elf64) | |
5547 | { | |
5548 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5549 | ||
5550 | if (p->p_type == PT_PHDR) | |
5551 | relocation = phdr_memaddr - p->p_vaddr; | |
5552 | } | |
5553 | else | |
5554 | { | |
5555 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5556 | ||
5557 | if (p->p_type == PT_PHDR) | |
5558 | relocation = phdr_memaddr - p->p_vaddr; | |
5559 | } | |
5560 | ||
5561 | if (relocation == -1) | |
5562 | { | |
e237a7e2 JK |
5563 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
5564 | any real world executables, including PIE executables, have always | |
5565 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
5566 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
5567 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
5568 | ||
5569 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
5570 | ||
5571 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
5572 | ||
2268b414 JK |
5573 | return 0; |
5574 | } | |
5575 | ||
5576 | for (i = 0; i < num_phdr; i++) | |
5577 | { | |
5578 | if (is_elf64) | |
5579 | { | |
5580 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5581 | ||
5582 | if (p->p_type == PT_DYNAMIC) | |
5583 | return p->p_vaddr + relocation; | |
5584 | } | |
5585 | else | |
5586 | { | |
5587 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5588 | ||
5589 | if (p->p_type == PT_DYNAMIC) | |
5590 | return p->p_vaddr + relocation; | |
5591 | } | |
5592 | } | |
5593 | ||
5594 | return 0; | |
5595 | } | |
5596 | ||
5597 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
5598 | can be 0 if the inferior does not yet have the library list initialized. |
5599 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
5600 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
5601 | |
5602 | static CORE_ADDR | |
5603 | get_r_debug (const int pid, const int is_elf64) | |
5604 | { | |
5605 | CORE_ADDR dynamic_memaddr; | |
5606 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5607 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 5608 | CORE_ADDR map = -1; |
2268b414 JK |
5609 | |
5610 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5611 | if (dynamic_memaddr == 0) | |
367ba2c2 | 5612 | return map; |
2268b414 JK |
5613 | |
5614 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5615 | { | |
5616 | if (is_elf64) | |
5617 | { | |
5618 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
75f62ce7 | 5619 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5620 | union |
5621 | { | |
5622 | Elf64_Xword map; | |
5623 | unsigned char buf[sizeof (Elf64_Xword)]; | |
5624 | } | |
5625 | rld_map; | |
5626 | ||
5627 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5628 | { | |
5629 | if (linux_read_memory (dyn->d_un.d_val, | |
5630 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5631 | return rld_map.map; | |
5632 | else | |
5633 | break; | |
5634 | } | |
75f62ce7 | 5635 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5636 | |
367ba2c2 MR |
5637 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5638 | map = dyn->d_un.d_val; | |
2268b414 JK |
5639 | |
5640 | if (dyn->d_tag == DT_NULL) | |
5641 | break; | |
5642 | } | |
5643 | else | |
5644 | { | |
5645 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
75f62ce7 | 5646 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5647 | union |
5648 | { | |
5649 | Elf32_Word map; | |
5650 | unsigned char buf[sizeof (Elf32_Word)]; | |
5651 | } | |
5652 | rld_map; | |
5653 | ||
5654 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5655 | { | |
5656 | if (linux_read_memory (dyn->d_un.d_val, | |
5657 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5658 | return rld_map.map; | |
5659 | else | |
5660 | break; | |
5661 | } | |
75f62ce7 | 5662 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5663 | |
367ba2c2 MR |
5664 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5665 | map = dyn->d_un.d_val; | |
2268b414 JK |
5666 | |
5667 | if (dyn->d_tag == DT_NULL) | |
5668 | break; | |
5669 | } | |
5670 | ||
5671 | dynamic_memaddr += dyn_size; | |
5672 | } | |
5673 | ||
367ba2c2 | 5674 | return map; |
2268b414 JK |
5675 | } |
5676 | ||
5677 | /* Read one pointer from MEMADDR in the inferior. */ | |
5678 | ||
5679 | static int | |
5680 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5681 | { | |
485f1ee4 PA |
5682 | int ret; |
5683 | ||
5684 | /* Go through a union so this works on either big or little endian | |
5685 | hosts, when the inferior's pointer size is smaller than the size | |
5686 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
5687 | same of the superior's. */ | |
5688 | union | |
5689 | { | |
5690 | CORE_ADDR core_addr; | |
5691 | unsigned int ui; | |
5692 | unsigned char uc; | |
5693 | } addr; | |
5694 | ||
5695 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
5696 | if (ret == 0) | |
5697 | { | |
5698 | if (ptr_size == sizeof (CORE_ADDR)) | |
5699 | *ptr = addr.core_addr; | |
5700 | else if (ptr_size == sizeof (unsigned int)) | |
5701 | *ptr = addr.ui; | |
5702 | else | |
5703 | gdb_assert_not_reached ("unhandled pointer size"); | |
5704 | } | |
5705 | return ret; | |
2268b414 JK |
5706 | } |
5707 | ||
5708 | struct link_map_offsets | |
5709 | { | |
5710 | /* Offset and size of r_debug.r_version. */ | |
5711 | int r_version_offset; | |
5712 | ||
5713 | /* Offset and size of r_debug.r_map. */ | |
5714 | int r_map_offset; | |
5715 | ||
5716 | /* Offset to l_addr field in struct link_map. */ | |
5717 | int l_addr_offset; | |
5718 | ||
5719 | /* Offset to l_name field in struct link_map. */ | |
5720 | int l_name_offset; | |
5721 | ||
5722 | /* Offset to l_ld field in struct link_map. */ | |
5723 | int l_ld_offset; | |
5724 | ||
5725 | /* Offset to l_next field in struct link_map. */ | |
5726 | int l_next_offset; | |
5727 | ||
5728 | /* Offset to l_prev field in struct link_map. */ | |
5729 | int l_prev_offset; | |
5730 | }; | |
5731 | ||
fb723180 | 5732 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
5733 | |
5734 | static int | |
5735 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5736 | unsigned const char *writebuf, | |
5737 | CORE_ADDR offset, int len) | |
5738 | { | |
5739 | char *document; | |
5740 | unsigned document_len; | |
5741 | struct process_info_private *const priv = current_process ()->private; | |
5742 | char filename[PATH_MAX]; | |
5743 | int pid, is_elf64; | |
5744 | ||
5745 | static const struct link_map_offsets lmo_32bit_offsets = | |
5746 | { | |
5747 | 0, /* r_version offset. */ | |
5748 | 4, /* r_debug.r_map offset. */ | |
5749 | 0, /* l_addr offset in link_map. */ | |
5750 | 4, /* l_name offset in link_map. */ | |
5751 | 8, /* l_ld offset in link_map. */ | |
5752 | 12, /* l_next offset in link_map. */ | |
5753 | 16 /* l_prev offset in link_map. */ | |
5754 | }; | |
5755 | ||
5756 | static const struct link_map_offsets lmo_64bit_offsets = | |
5757 | { | |
5758 | 0, /* r_version offset. */ | |
5759 | 8, /* r_debug.r_map offset. */ | |
5760 | 0, /* l_addr offset in link_map. */ | |
5761 | 8, /* l_name offset in link_map. */ | |
5762 | 16, /* l_ld offset in link_map. */ | |
5763 | 24, /* l_next offset in link_map. */ | |
5764 | 32 /* l_prev offset in link_map. */ | |
5765 | }; | |
5766 | const struct link_map_offsets *lmo; | |
214d508e | 5767 | unsigned int machine; |
b1fbec62 GB |
5768 | int ptr_size; |
5769 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
5770 | int allocated = 1024; | |
5771 | char *p; | |
5772 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
5773 | int header_done = 0; | |
2268b414 JK |
5774 | |
5775 | if (writebuf != NULL) | |
5776 | return -2; | |
5777 | if (readbuf == NULL) | |
5778 | return -1; | |
5779 | ||
d86d4aaf | 5780 | pid = lwpid_of (current_inferior); |
2268b414 | 5781 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 5782 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 5783 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 5784 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 5785 | |
b1fbec62 GB |
5786 | while (annex[0] != '\0') |
5787 | { | |
5788 | const char *sep; | |
5789 | CORE_ADDR *addrp; | |
5790 | int len; | |
2268b414 | 5791 | |
b1fbec62 GB |
5792 | sep = strchr (annex, '='); |
5793 | if (sep == NULL) | |
5794 | break; | |
0c5bf5a9 | 5795 | |
b1fbec62 GB |
5796 | len = sep - annex; |
5797 | if (len == 5 && strncmp (annex, "start", 5) == 0) | |
5798 | addrp = &lm_addr; | |
5799 | else if (len == 4 && strncmp (annex, "prev", 4) == 0) | |
5800 | addrp = &lm_prev; | |
5801 | else | |
5802 | { | |
5803 | annex = strchr (sep, ';'); | |
5804 | if (annex == NULL) | |
5805 | break; | |
5806 | annex++; | |
5807 | continue; | |
5808 | } | |
5809 | ||
5810 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 5811 | } |
b1fbec62 GB |
5812 | |
5813 | if (lm_addr == 0) | |
2268b414 | 5814 | { |
b1fbec62 GB |
5815 | int r_version = 0; |
5816 | ||
5817 | if (priv->r_debug == 0) | |
5818 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5819 | ||
5820 | /* We failed to find DT_DEBUG. Such situation will not change | |
5821 | for this inferior - do not retry it. Report it to GDB as | |
5822 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
5823 | if (priv->r_debug == (CORE_ADDR) -1) | |
5824 | return -1; | |
5825 | ||
5826 | if (priv->r_debug != 0) | |
2268b414 | 5827 | { |
b1fbec62 GB |
5828 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
5829 | (unsigned char *) &r_version, | |
5830 | sizeof (r_version)) != 0 | |
5831 | || r_version != 1) | |
5832 | { | |
5833 | warning ("unexpected r_debug version %d", r_version); | |
5834 | } | |
5835 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5836 | &lm_addr, ptr_size) != 0) | |
5837 | { | |
5838 | warning ("unable to read r_map from 0x%lx", | |
5839 | (long) priv->r_debug + lmo->r_map_offset); | |
5840 | } | |
2268b414 | 5841 | } |
b1fbec62 | 5842 | } |
2268b414 | 5843 | |
b1fbec62 GB |
5844 | document = xmalloc (allocated); |
5845 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
5846 | p = document + strlen (document); | |
5847 | ||
5848 | while (lm_addr | |
5849 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
5850 | &l_name, ptr_size) == 0 | |
5851 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
5852 | &l_addr, ptr_size) == 0 | |
5853 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
5854 | &l_ld, ptr_size) == 0 | |
5855 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
5856 | &l_prev, ptr_size) == 0 | |
5857 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
5858 | &l_next, ptr_size) == 0) | |
5859 | { | |
5860 | unsigned char libname[PATH_MAX]; | |
5861 | ||
5862 | if (lm_prev != l_prev) | |
2268b414 | 5863 | { |
b1fbec62 GB |
5864 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
5865 | (long) lm_prev, (long) l_prev); | |
5866 | break; | |
2268b414 JK |
5867 | } |
5868 | ||
d878444c JK |
5869 | /* Ignore the first entry even if it has valid name as the first entry |
5870 | corresponds to the main executable. The first entry should not be | |
5871 | skipped if the dynamic loader was loaded late by a static executable | |
5872 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
5873 | executable does not have PT_DYNAMIC present and this function already | |
5874 | exited above due to failed get_r_debug. */ | |
5875 | if (lm_prev == 0) | |
2268b414 | 5876 | { |
d878444c JK |
5877 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
5878 | p = p + strlen (p); | |
5879 | } | |
5880 | else | |
5881 | { | |
5882 | /* Not checking for error because reading may stop before | |
5883 | we've got PATH_MAX worth of characters. */ | |
5884 | libname[0] = '\0'; | |
5885 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
5886 | libname[sizeof (libname) - 1] = '\0'; | |
5887 | if (libname[0] != '\0') | |
2268b414 | 5888 | { |
d878444c JK |
5889 | /* 6x the size for xml_escape_text below. */ |
5890 | size_t len = 6 * strlen ((char *) libname); | |
5891 | char *name; | |
2268b414 | 5892 | |
d878444c JK |
5893 | if (!header_done) |
5894 | { | |
5895 | /* Terminate `<library-list-svr4'. */ | |
5896 | *p++ = '>'; | |
5897 | header_done = 1; | |
5898 | } | |
2268b414 | 5899 | |
d878444c JK |
5900 | while (allocated < p - document + len + 200) |
5901 | { | |
5902 | /* Expand to guarantee sufficient storage. */ | |
5903 | uintptr_t document_len = p - document; | |
2268b414 | 5904 | |
d878444c JK |
5905 | document = xrealloc (document, 2 * allocated); |
5906 | allocated *= 2; | |
5907 | p = document + document_len; | |
5908 | } | |
5909 | ||
5910 | name = xml_escape_text ((char *) libname); | |
5911 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
5912 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
5913 | name, (unsigned long) lm_addr, | |
5914 | (unsigned long) l_addr, (unsigned long) l_ld); | |
5915 | free (name); | |
5916 | } | |
0afae3cf | 5917 | } |
b1fbec62 GB |
5918 | |
5919 | lm_prev = lm_addr; | |
5920 | lm_addr = l_next; | |
2268b414 JK |
5921 | } |
5922 | ||
b1fbec62 GB |
5923 | if (!header_done) |
5924 | { | |
5925 | /* Empty list; terminate `<library-list-svr4'. */ | |
5926 | strcpy (p, "/>"); | |
5927 | } | |
5928 | else | |
5929 | strcpy (p, "</library-list-svr4>"); | |
5930 | ||
2268b414 JK |
5931 | document_len = strlen (document); |
5932 | if (offset < document_len) | |
5933 | document_len -= offset; | |
5934 | else | |
5935 | document_len = 0; | |
5936 | if (len > document_len) | |
5937 | len = document_len; | |
5938 | ||
5939 | memcpy (readbuf, document + offset, len); | |
5940 | xfree (document); | |
5941 | ||
5942 | return len; | |
5943 | } | |
5944 | ||
9accd112 MM |
5945 | #ifdef HAVE_LINUX_BTRACE |
5946 | ||
969c39fb | 5947 | /* See to_enable_btrace target method. */ |
9accd112 MM |
5948 | |
5949 | static struct btrace_target_info * | |
5950 | linux_low_enable_btrace (ptid_t ptid) | |
5951 | { | |
5952 | struct btrace_target_info *tinfo; | |
5953 | ||
5954 | tinfo = linux_enable_btrace (ptid); | |
3aee8918 | 5955 | |
9accd112 | 5956 | if (tinfo != NULL) |
3aee8918 PA |
5957 | { |
5958 | struct thread_info *thread = find_thread_ptid (ptid); | |
5959 | struct regcache *regcache = get_thread_regcache (thread, 0); | |
5960 | ||
5961 | tinfo->ptr_bits = register_size (regcache->tdesc, 0) * 8; | |
5962 | } | |
9accd112 MM |
5963 | |
5964 | return tinfo; | |
5965 | } | |
5966 | ||
969c39fb | 5967 | /* See to_disable_btrace target method. */ |
9accd112 | 5968 | |
969c39fb MM |
5969 | static int |
5970 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
5971 | { | |
5972 | enum btrace_error err; | |
5973 | ||
5974 | err = linux_disable_btrace (tinfo); | |
5975 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
5976 | } | |
5977 | ||
5978 | /* See to_read_btrace target method. */ | |
5979 | ||
5980 | static int | |
9accd112 MM |
5981 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
5982 | int type) | |
5983 | { | |
5984 | VEC (btrace_block_s) *btrace; | |
5985 | struct btrace_block *block; | |
969c39fb | 5986 | enum btrace_error err; |
9accd112 MM |
5987 | int i; |
5988 | ||
969c39fb MM |
5989 | btrace = NULL; |
5990 | err = linux_read_btrace (&btrace, tinfo, type); | |
5991 | if (err != BTRACE_ERR_NONE) | |
5992 | { | |
5993 | if (err == BTRACE_ERR_OVERFLOW) | |
5994 | buffer_grow_str0 (buffer, "E.Overflow."); | |
5995 | else | |
5996 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
5997 | ||
5998 | return -1; | |
5999 | } | |
9accd112 MM |
6000 | |
6001 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6002 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
6003 | ||
6004 | for (i = 0; VEC_iterate (btrace_block_s, btrace, i, block); i++) | |
6005 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
6006 | paddress (block->begin), paddress (block->end)); | |
6007 | ||
969c39fb | 6008 | buffer_grow_str0 (buffer, "</btrace>\n"); |
9accd112 MM |
6009 | |
6010 | VEC_free (btrace_block_s, btrace); | |
969c39fb MM |
6011 | |
6012 | return 0; | |
9accd112 MM |
6013 | } |
6014 | #endif /* HAVE_LINUX_BTRACE */ | |
6015 | ||
ce3a066d DJ |
6016 | static struct target_ops linux_target_ops = { |
6017 | linux_create_inferior, | |
6018 | linux_attach, | |
6019 | linux_kill, | |
6ad8ae5c | 6020 | linux_detach, |
8336d594 | 6021 | linux_mourn, |
444d6139 | 6022 | linux_join, |
ce3a066d DJ |
6023 | linux_thread_alive, |
6024 | linux_resume, | |
6025 | linux_wait, | |
6026 | linux_fetch_registers, | |
6027 | linux_store_registers, | |
90d74c30 | 6028 | linux_prepare_to_access_memory, |
0146f85b | 6029 | linux_done_accessing_memory, |
ce3a066d DJ |
6030 | linux_read_memory, |
6031 | linux_write_memory, | |
2f2893d9 | 6032 | linux_look_up_symbols, |
ef57601b | 6033 | linux_request_interrupt, |
aa691b87 | 6034 | linux_read_auxv, |
802e8e6d | 6035 | linux_supports_z_point_type, |
d993e290 PA |
6036 | linux_insert_point, |
6037 | linux_remove_point, | |
e013ee27 OF |
6038 | linux_stopped_by_watchpoint, |
6039 | linux_stopped_data_address, | |
db0dfaa0 LM |
6040 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
6041 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
6042 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 6043 | linux_read_offsets, |
dae5f5cf DJ |
6044 | #else |
6045 | NULL, | |
6046 | #endif | |
6047 | #ifdef USE_THREAD_DB | |
6048 | thread_db_get_tls_address, | |
6049 | #else | |
6050 | NULL, | |
52fb6437 | 6051 | #endif |
efcbbd14 | 6052 | linux_qxfer_spu, |
59a016f0 | 6053 | hostio_last_error_from_errno, |
07e059b5 | 6054 | linux_qxfer_osdata, |
4aa995e1 | 6055 | linux_xfer_siginfo, |
bd99dc85 PA |
6056 | linux_supports_non_stop, |
6057 | linux_async, | |
6058 | linux_start_non_stop, | |
cdbfd419 PP |
6059 | linux_supports_multi_process, |
6060 | #ifdef USE_THREAD_DB | |
dc146f7c | 6061 | thread_db_handle_monitor_command, |
cdbfd419 | 6062 | #else |
dc146f7c | 6063 | NULL, |
cdbfd419 | 6064 | #endif |
d26e3629 | 6065 | linux_common_core_of_thread, |
78d85199 | 6066 | linux_read_loadmap, |
219f2f23 PA |
6067 | linux_process_qsupported, |
6068 | linux_supports_tracepoints, | |
6069 | linux_read_pc, | |
8336d594 PA |
6070 | linux_write_pc, |
6071 | linux_thread_stopped, | |
7984d532 | 6072 | NULL, |
711e434b | 6073 | linux_pause_all, |
7984d532 | 6074 | linux_unpause_all, |
fa593d66 PA |
6075 | linux_cancel_breakpoints, |
6076 | linux_stabilize_threads, | |
6a271cae | 6077 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
6078 | linux_emit_ops, |
6079 | linux_supports_disable_randomization, | |
405f8e94 | 6080 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 6081 | linux_qxfer_libraries_svr4, |
d1feda86 | 6082 | linux_supports_agent, |
9accd112 MM |
6083 | #ifdef HAVE_LINUX_BTRACE |
6084 | linux_supports_btrace, | |
6085 | linux_low_enable_btrace, | |
969c39fb | 6086 | linux_low_disable_btrace, |
9accd112 MM |
6087 | linux_low_read_btrace, |
6088 | #else | |
6089 | NULL, | |
6090 | NULL, | |
6091 | NULL, | |
6092 | NULL, | |
9accd112 | 6093 | #endif |
c2d6af84 | 6094 | linux_supports_range_stepping, |
ce3a066d DJ |
6095 | }; |
6096 | ||
0d62e5e8 DJ |
6097 | static void |
6098 | linux_init_signals () | |
6099 | { | |
6100 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
6101 | to find what the cancel signal actually is. */ | |
1a981360 | 6102 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 6103 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 6104 | #endif |
0d62e5e8 DJ |
6105 | } |
6106 | ||
3aee8918 PA |
6107 | #ifdef HAVE_LINUX_REGSETS |
6108 | void | |
6109 | initialize_regsets_info (struct regsets_info *info) | |
6110 | { | |
6111 | for (info->num_regsets = 0; | |
6112 | info->regsets[info->num_regsets].size >= 0; | |
6113 | info->num_regsets++) | |
6114 | ; | |
3aee8918 PA |
6115 | } |
6116 | #endif | |
6117 | ||
da6d8c04 DJ |
6118 | void |
6119 | initialize_low (void) | |
6120 | { | |
bd99dc85 PA |
6121 | struct sigaction sigchld_action; |
6122 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 6123 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
6124 | set_breakpoint_data (the_low_target.breakpoint, |
6125 | the_low_target.breakpoint_len); | |
0d62e5e8 | 6126 | linux_init_signals (); |
aa7c7447 | 6127 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
6128 | |
6129 | sigchld_action.sa_handler = sigchld_handler; | |
6130 | sigemptyset (&sigchld_action.sa_mask); | |
6131 | sigchld_action.sa_flags = SA_RESTART; | |
6132 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
6133 | |
6134 | initialize_low_arch (); | |
da6d8c04 | 6135 | } |