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" |
d26e3629 | 21 | #include "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> |
af96c192 | 29 | #include "linux-ptrace.h" |
e3deef73 | 30 | #include "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 MM |
107 | #ifdef HAVE_LINUX_BTRACE |
108 | # include "linux-btrace.h" | |
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 | ||
638 | /* Attach to an inferior process. */ | |
639 | ||
95954743 PA |
640 | static void |
641 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 642 | { |
95954743 | 643 | ptid_t ptid; |
54a0b537 | 644 | struct lwp_info *new_lwp; |
611cb4a5 | 645 | |
b8e1b30e | 646 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 647 | != 0) |
da6d8c04 | 648 | { |
87b0bb13 JK |
649 | struct buffer buffer; |
650 | ||
95954743 | 651 | if (!initial) |
2d717e4f DJ |
652 | { |
653 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 654 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
655 | strerror (errno), errno); |
656 | fflush (stderr); | |
657 | return; | |
658 | } | |
5f572dec JK |
659 | |
660 | /* If we fail to attach to a process, report an error. */ | |
87b0bb13 JK |
661 | buffer_init (&buffer); |
662 | linux_ptrace_attach_warnings (lwpid, &buffer); | |
663 | buffer_grow_str0 (&buffer, ""); | |
664 | error ("%sCannot attach to lwp %ld: %s (%d)", buffer_finish (&buffer), | |
665 | lwpid, strerror (errno), errno); | |
da6d8c04 DJ |
666 | } |
667 | ||
95954743 | 668 | if (initial) |
e3deef73 LM |
669 | /* If lwp is the tgid, we handle adding existing threads later. |
670 | Otherwise we just add lwp without bothering about any other | |
671 | threads. */ | |
95954743 PA |
672 | ptid = ptid_build (lwpid, lwpid, 0); |
673 | else | |
674 | { | |
675 | /* Note that extracting the pid from the current inferior is | |
676 | safe, since we're always called in the context of the same | |
677 | process as this new thread. */ | |
d86d4aaf | 678 | int pid = pid_of (current_inferior); |
95954743 PA |
679 | ptid = ptid_build (pid, lwpid, 0); |
680 | } | |
24a09b5f | 681 | |
b3312d80 | 682 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 683 | |
a6dbe5df PA |
684 | /* We need to wait for SIGSTOP before being able to make the next |
685 | ptrace call on this LWP. */ | |
686 | new_lwp->must_set_ptrace_flags = 1; | |
687 | ||
644cebc9 | 688 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
689 | { |
690 | if (debug_threads) | |
87ce2a04 | 691 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
692 | |
693 | /* The process is definitely stopped. It is in a job control | |
694 | stop, unless the kernel predates the TASK_STOPPED / | |
695 | TASK_TRACED distinction, in which case it might be in a | |
696 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
697 | can kill it, signal it, et cetera. | |
698 | ||
699 | First make sure there is a pending SIGSTOP. Since we are | |
700 | already attached, the process can not transition from stopped | |
701 | to running without a PTRACE_CONT; so we know this signal will | |
702 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
703 | probably already in the queue (unless this kernel is old | |
704 | enough to use TASK_STOPPED for ptrace stops); but since | |
705 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
706 | kill_lwp (lwpid, SIGSTOP); | |
707 | ||
708 | /* Finally, resume the stopped process. This will deliver the | |
709 | SIGSTOP (or a higher priority signal, just like normal | |
710 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 711 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
712 | } |
713 | ||
0d62e5e8 | 714 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
715 | brings it to a halt. |
716 | ||
717 | There are several cases to consider here: | |
718 | ||
719 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 720 | of a new thread that is being created. |
d50171e4 PA |
721 | In this case we should ignore that SIGSTOP and resume the |
722 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 723 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 724 | resume_continue. |
0e21c1ec DE |
725 | |
726 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
727 | to it via attach_inferior. |
728 | In this case we want the process thread to stop. | |
d50171e4 PA |
729 | This is handled by having linux_attach set last_resume_kind == |
730 | resume_stop after we return. | |
e3deef73 LM |
731 | |
732 | If the pid we are attaching to is also the tgid, we attach to and | |
733 | stop all the existing threads. Otherwise, we attach to pid and | |
734 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
735 | |
736 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
737 | existing threads. |
738 | In this case we want the thread to stop. | |
739 | FIXME: This case is currently not properly handled. | |
740 | We should wait for the SIGSTOP but don't. Things work apparently | |
741 | because enough time passes between when we ptrace (ATTACH) and when | |
742 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
743 | |
744 | On the other hand, if we are currently trying to stop all threads, we | |
745 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 746 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
747 | end of the list, and so the new thread has not yet reached |
748 | wait_for_sigstop (but will). */ | |
d50171e4 | 749 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
750 | } |
751 | ||
95954743 PA |
752 | void |
753 | linux_attach_lwp (unsigned long lwpid) | |
754 | { | |
755 | linux_attach_lwp_1 (lwpid, 0); | |
756 | } | |
757 | ||
e3deef73 LM |
758 | /* Attach to PID. If PID is the tgid, attach to it and all |
759 | of its threads. */ | |
760 | ||
c52daf70 | 761 | static int |
a1928bad | 762 | linux_attach (unsigned long pid) |
0d62e5e8 | 763 | { |
e3deef73 LM |
764 | /* Attach to PID. We will check for other threads |
765 | soon. */ | |
95954743 | 766 | linux_attach_lwp_1 (pid, 1); |
95954743 | 767 | linux_add_process (pid, 1); |
0d62e5e8 | 768 | |
bd99dc85 PA |
769 | if (!non_stop) |
770 | { | |
8336d594 PA |
771 | struct thread_info *thread; |
772 | ||
773 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
774 | process. It will be collected by wait shortly. */ | |
775 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
776 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 777 | } |
0d62e5e8 | 778 | |
e3deef73 LM |
779 | if (linux_proc_get_tgid (pid) == pid) |
780 | { | |
781 | DIR *dir; | |
782 | char pathname[128]; | |
783 | ||
784 | sprintf (pathname, "/proc/%ld/task", pid); | |
785 | ||
786 | dir = opendir (pathname); | |
787 | ||
788 | if (!dir) | |
789 | { | |
790 | fprintf (stderr, "Could not open /proc/%ld/task.\n", pid); | |
791 | fflush (stderr); | |
792 | } | |
793 | else | |
794 | { | |
795 | /* At this point we attached to the tgid. Scan the task for | |
796 | existing threads. */ | |
797 | unsigned long lwp; | |
798 | int new_threads_found; | |
799 | int iterations = 0; | |
800 | struct dirent *dp; | |
801 | ||
802 | while (iterations < 2) | |
803 | { | |
804 | new_threads_found = 0; | |
805 | /* Add all the other threads. While we go through the | |
806 | threads, new threads may be spawned. Cycle through | |
807 | the list of threads until we have done two iterations without | |
808 | finding new threads. */ | |
809 | while ((dp = readdir (dir)) != NULL) | |
810 | { | |
811 | /* Fetch one lwp. */ | |
812 | lwp = strtoul (dp->d_name, NULL, 10); | |
813 | ||
814 | /* Is this a new thread? */ | |
815 | if (lwp | |
816 | && find_thread_ptid (ptid_build (pid, lwp, 0)) == NULL) | |
817 | { | |
818 | linux_attach_lwp_1 (lwp, 0); | |
819 | new_threads_found++; | |
820 | ||
821 | if (debug_threads) | |
87ce2a04 DE |
822 | debug_printf ("Found and attached to new lwp %ld\n", |
823 | lwp); | |
e3deef73 LM |
824 | } |
825 | } | |
826 | ||
827 | if (!new_threads_found) | |
828 | iterations++; | |
829 | else | |
830 | iterations = 0; | |
831 | ||
832 | rewinddir (dir); | |
833 | } | |
834 | closedir (dir); | |
835 | } | |
836 | } | |
837 | ||
95954743 PA |
838 | return 0; |
839 | } | |
840 | ||
841 | struct counter | |
842 | { | |
843 | int pid; | |
844 | int count; | |
845 | }; | |
846 | ||
847 | static int | |
848 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
849 | { | |
850 | struct counter *counter = args; | |
851 | ||
852 | if (ptid_get_pid (entry->id) == counter->pid) | |
853 | { | |
854 | if (++counter->count > 1) | |
855 | return 1; | |
856 | } | |
d61ddec4 | 857 | |
da6d8c04 DJ |
858 | return 0; |
859 | } | |
860 | ||
95954743 | 861 | static int |
fa96cb38 | 862 | last_thread_of_process_p (int pid) |
95954743 | 863 | { |
95954743 | 864 | struct counter counter = { pid , 0 }; |
da6d8c04 | 865 | |
95954743 PA |
866 | return (find_inferior (&all_threads, |
867 | second_thread_of_pid_p, &counter) == NULL); | |
868 | } | |
869 | ||
da84f473 PA |
870 | /* Kill LWP. */ |
871 | ||
872 | static void | |
873 | linux_kill_one_lwp (struct lwp_info *lwp) | |
874 | { | |
d86d4aaf DE |
875 | struct thread_info *thr = get_lwp_thread (lwp); |
876 | int pid = lwpid_of (thr); | |
da84f473 PA |
877 | |
878 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
879 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
880 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
881 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
882 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
883 | per process, not one for each thread. But since we still support | |
884 | linuxthreads, and we also support debugging programs using raw | |
885 | clone without CLONE_THREAD, we send one for each thread. For | |
886 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
887 | about some old kernels where PTRACE_KILL might work better | |
888 | (dubious if there are any such, but that's why it's paranoia), so | |
889 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
890 | everywhere. */ | |
891 | ||
892 | errno = 0; | |
893 | kill (pid, SIGKILL); | |
894 | if (debug_threads) | |
87ce2a04 | 895 | debug_printf ("LKL: kill (SIGKILL) %s, 0, 0 (%s)\n", |
d86d4aaf | 896 | target_pid_to_str (ptid_of (thr)), |
87ce2a04 | 897 | errno ? strerror (errno) : "OK"); |
da84f473 PA |
898 | |
899 | errno = 0; | |
b8e1b30e | 900 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 901 | if (debug_threads) |
87ce2a04 | 902 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", |
d86d4aaf | 903 | target_pid_to_str (ptid_of (thr)), |
87ce2a04 | 904 | errno ? strerror (errno) : "OK"); |
da84f473 PA |
905 | } |
906 | ||
907 | /* Callback for `find_inferior'. Kills an lwp of a given process, | |
908 | except the leader. */ | |
95954743 PA |
909 | |
910 | static int | |
da84f473 | 911 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 912 | { |
0d62e5e8 | 913 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 914 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 915 | int wstat; |
95954743 PA |
916 | int pid = * (int *) args; |
917 | ||
918 | if (ptid_get_pid (entry->id) != pid) | |
919 | return 0; | |
0d62e5e8 | 920 | |
fd500816 DJ |
921 | /* We avoid killing the first thread here, because of a Linux kernel (at |
922 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
923 | the children get a chance to be reaped, it will remain a zombie | |
924 | forever. */ | |
95954743 | 925 | |
d86d4aaf | 926 | if (lwpid_of (thread) == pid) |
95954743 PA |
927 | { |
928 | if (debug_threads) | |
87ce2a04 DE |
929 | debug_printf ("lkop: is last of process %s\n", |
930 | target_pid_to_str (entry->id)); | |
95954743 PA |
931 | return 0; |
932 | } | |
fd500816 | 933 | |
0d62e5e8 DJ |
934 | do |
935 | { | |
da84f473 | 936 | linux_kill_one_lwp (lwp); |
0d62e5e8 DJ |
937 | |
938 | /* Make sure it died. The loop is most likely unnecessary. */ | |
d86d4aaf | 939 | pid = linux_wait_for_event (thread->entry.id, &wstat, __WALL); |
bd99dc85 | 940 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
941 | |
942 | return 0; | |
da6d8c04 DJ |
943 | } |
944 | ||
95954743 PA |
945 | static int |
946 | linux_kill (int pid) | |
0d62e5e8 | 947 | { |
95954743 | 948 | struct process_info *process; |
54a0b537 | 949 | struct lwp_info *lwp; |
fd500816 | 950 | int wstat; |
95954743 | 951 | int lwpid; |
fd500816 | 952 | |
95954743 PA |
953 | process = find_process_pid (pid); |
954 | if (process == NULL) | |
955 | return -1; | |
9d606399 | 956 | |
f9e39928 PA |
957 | /* If we're killing a running inferior, make sure it is stopped |
958 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 959 | stop_all_lwps (0, NULL); |
f9e39928 | 960 | |
da84f473 | 961 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 962 | |
54a0b537 | 963 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 964 | thread in the list, so do so now. */ |
95954743 | 965 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 966 | |
784867a5 | 967 | if (lwp == NULL) |
fd500816 | 968 | { |
784867a5 | 969 | if (debug_threads) |
d86d4aaf DE |
970 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
971 | pid); | |
784867a5 JK |
972 | } |
973 | else | |
974 | { | |
d86d4aaf DE |
975 | struct thread_info *thr = get_lwp_thread (lwp); |
976 | ||
784867a5 | 977 | if (debug_threads) |
87ce2a04 | 978 | debug_printf ("lk_1: killing lwp %ld, for pid: %d\n", |
d86d4aaf | 979 | lwpid_of (thr), pid); |
fd500816 | 980 | |
784867a5 JK |
981 | do |
982 | { | |
da84f473 | 983 | linux_kill_one_lwp (lwp); |
784867a5 JK |
984 | |
985 | /* Make sure it died. The loop is most likely unnecessary. */ | |
d86d4aaf | 986 | lwpid = linux_wait_for_event (thr->entry.id, &wstat, __WALL); |
784867a5 JK |
987 | } while (lwpid > 0 && WIFSTOPPED (wstat)); |
988 | } | |
2d717e4f | 989 | |
8336d594 | 990 | the_target->mourn (process); |
f9e39928 PA |
991 | |
992 | /* Since we presently can only stop all lwps of all processes, we | |
993 | need to unstop lwps of other processes. */ | |
7984d532 | 994 | unstop_all_lwps (0, NULL); |
95954743 | 995 | return 0; |
0d62e5e8 DJ |
996 | } |
997 | ||
9b224c5e PA |
998 | /* Get pending signal of THREAD, for detaching purposes. This is the |
999 | signal the thread last stopped for, which we need to deliver to the | |
1000 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1001 | ||
1002 | static int | |
1003 | get_detach_signal (struct thread_info *thread) | |
1004 | { | |
a493e3e2 | 1005 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1006 | int status; |
1007 | struct lwp_info *lp = get_thread_lwp (thread); | |
1008 | ||
1009 | if (lp->status_pending_p) | |
1010 | status = lp->status_pending; | |
1011 | else | |
1012 | { | |
1013 | /* If the thread had been suspended by gdbserver, and it stopped | |
1014 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1015 | want to deliver that SIGSTOP. */ | |
1016 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1017 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1018 | return 0; |
1019 | ||
1020 | /* Otherwise, we may need to deliver the signal we | |
1021 | intercepted. */ | |
1022 | status = lp->last_status; | |
1023 | } | |
1024 | ||
1025 | if (!WIFSTOPPED (status)) | |
1026 | { | |
1027 | if (debug_threads) | |
87ce2a04 | 1028 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1029 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1030 | return 0; |
1031 | } | |
1032 | ||
1033 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
1034 | if (WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
1035 | { | |
1036 | if (debug_threads) | |
87ce2a04 DE |
1037 | debug_printf ("GPS: lwp %s had stopped with extended " |
1038 | "status: no pending signal\n", | |
d86d4aaf | 1039 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1040 | return 0; |
1041 | } | |
1042 | ||
2ea28649 | 1043 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1044 | |
1045 | if (program_signals_p && !program_signals[signo]) | |
1046 | { | |
1047 | if (debug_threads) | |
87ce2a04 | 1048 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1049 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1050 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1051 | return 0; |
1052 | } | |
1053 | else if (!program_signals_p | |
1054 | /* If we have no way to know which signals GDB does not | |
1055 | want to have passed to the program, assume | |
1056 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1057 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1058 | { |
1059 | if (debug_threads) | |
87ce2a04 DE |
1060 | debug_printf ("GPS: lwp %s had signal %s, " |
1061 | "but we don't know if we should pass it. " | |
1062 | "Default to not.\n", | |
d86d4aaf | 1063 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1064 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1065 | return 0; |
1066 | } | |
1067 | else | |
1068 | { | |
1069 | if (debug_threads) | |
87ce2a04 | 1070 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1071 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1072 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1073 | |
1074 | return WSTOPSIG (status); | |
1075 | } | |
1076 | } | |
1077 | ||
95954743 PA |
1078 | static int |
1079 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1080 | { |
1081 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1082 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1083 | int pid = * (int *) args; |
9b224c5e | 1084 | int sig; |
95954743 PA |
1085 | |
1086 | if (ptid_get_pid (entry->id) != pid) | |
1087 | return 0; | |
6ad8ae5c | 1088 | |
9b224c5e | 1089 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1090 | if (lwp->stop_expected) |
ae13219e | 1091 | { |
9b224c5e | 1092 | if (debug_threads) |
87ce2a04 | 1093 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1094 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1095 | |
d86d4aaf | 1096 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1097 | lwp->stop_expected = 0; |
ae13219e DJ |
1098 | } |
1099 | ||
1100 | /* Flush any pending changes to the process's registers. */ | |
d86d4aaf | 1101 | regcache_invalidate_thread (thread); |
ae13219e | 1102 | |
9b224c5e PA |
1103 | /* Pass on any pending signal for this thread. */ |
1104 | sig = get_detach_signal (thread); | |
1105 | ||
ae13219e | 1106 | /* Finally, let it resume. */ |
82bfbe7e PA |
1107 | if (the_low_target.prepare_to_resume != NULL) |
1108 | the_low_target.prepare_to_resume (lwp); | |
d86d4aaf | 1109 | if (ptrace (PTRACE_DETACH, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
b8e1b30e | 1110 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
9b224c5e | 1111 | error (_("Can't detach %s: %s"), |
d86d4aaf | 1112 | target_pid_to_str (ptid_of (thread)), |
9b224c5e | 1113 | strerror (errno)); |
bd99dc85 PA |
1114 | |
1115 | delete_lwp (lwp); | |
95954743 | 1116 | return 0; |
6ad8ae5c DJ |
1117 | } |
1118 | ||
95954743 PA |
1119 | static int |
1120 | linux_detach (int pid) | |
1121 | { | |
1122 | struct process_info *process; | |
1123 | ||
1124 | process = find_process_pid (pid); | |
1125 | if (process == NULL) | |
1126 | return -1; | |
1127 | ||
f9e39928 PA |
1128 | /* Stop all threads before detaching. First, ptrace requires that |
1129 | the thread is stopped to sucessfully detach. Second, thread_db | |
1130 | may need to uninstall thread event breakpoints from memory, which | |
1131 | only works with a stopped process anyway. */ | |
7984d532 | 1132 | stop_all_lwps (0, NULL); |
f9e39928 | 1133 | |
ca5c370d | 1134 | #ifdef USE_THREAD_DB |
8336d594 | 1135 | thread_db_detach (process); |
ca5c370d PA |
1136 | #endif |
1137 | ||
fa593d66 PA |
1138 | /* Stabilize threads (move out of jump pads). */ |
1139 | stabilize_threads (); | |
1140 | ||
95954743 | 1141 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1142 | |
1143 | the_target->mourn (process); | |
f9e39928 PA |
1144 | |
1145 | /* Since we presently can only stop all lwps of all processes, we | |
1146 | need to unstop lwps of other processes. */ | |
7984d532 | 1147 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1148 | return 0; |
1149 | } | |
1150 | ||
1151 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1152 | ||
1153 | static int | |
1154 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1155 | { | |
d86d4aaf DE |
1156 | struct thread_info *thread = (struct thread_info *) entry; |
1157 | struct lwp_info *lwp = get_thread_lwp (thread); | |
f9e39928 PA |
1158 | struct process_info *process = proc; |
1159 | ||
d86d4aaf | 1160 | if (pid_of (thread) == pid_of (process)) |
f9e39928 PA |
1161 | delete_lwp (lwp); |
1162 | ||
dd6953e1 | 1163 | return 0; |
6ad8ae5c DJ |
1164 | } |
1165 | ||
8336d594 PA |
1166 | static void |
1167 | linux_mourn (struct process_info *process) | |
1168 | { | |
1169 | struct process_info_private *priv; | |
1170 | ||
1171 | #ifdef USE_THREAD_DB | |
1172 | thread_db_mourn (process); | |
1173 | #endif | |
1174 | ||
d86d4aaf | 1175 | find_inferior (&all_threads, delete_lwp_callback, process); |
f9e39928 | 1176 | |
8336d594 PA |
1177 | /* Freeing all private data. */ |
1178 | priv = process->private; | |
1179 | free (priv->arch_private); | |
1180 | free (priv); | |
1181 | process->private = NULL; | |
505106cd PA |
1182 | |
1183 | remove_process (process); | |
8336d594 PA |
1184 | } |
1185 | ||
444d6139 | 1186 | static void |
95954743 | 1187 | linux_join (int pid) |
444d6139 | 1188 | { |
444d6139 PA |
1189 | int status, ret; |
1190 | ||
1191 | do { | |
95954743 | 1192 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1193 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1194 | break; | |
1195 | } while (ret != -1 || errno != ECHILD); | |
1196 | } | |
1197 | ||
6ad8ae5c | 1198 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1199 | static int |
95954743 | 1200 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1201 | { |
95954743 PA |
1202 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1203 | ||
1204 | /* We assume we always know if a thread exits. If a whole process | |
1205 | exited but we still haven't been able to report it to GDB, we'll | |
1206 | hold on to the last lwp of the dead process. */ | |
1207 | if (lwp != NULL) | |
1208 | return !lwp->dead; | |
0d62e5e8 DJ |
1209 | else |
1210 | return 0; | |
1211 | } | |
1212 | ||
6bf5e0ba | 1213 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1214 | static int |
d50171e4 | 1215 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1216 | { |
d86d4aaf DE |
1217 | struct thread_info *thread = (struct thread_info *) entry; |
1218 | struct lwp_info *lwp = get_thread_lwp (thread); | |
95954743 PA |
1219 | ptid_t ptid = * (ptid_t *) arg; |
1220 | ||
1221 | /* Check if we're only interested in events from a specific process | |
1222 | or its lwps. */ | |
1223 | if (!ptid_equal (minus_one_ptid, ptid) | |
d86d4aaf | 1224 | && ptid_get_pid (ptid) != ptid_get_pid (thread->entry.id)) |
95954743 | 1225 | return 0; |
0d62e5e8 | 1226 | |
d50171e4 PA |
1227 | /* If we got a `vCont;t', but we haven't reported a stop yet, do |
1228 | report any status pending the LWP may have. */ | |
8336d594 | 1229 | if (thread->last_resume_kind == resume_stop |
7984d532 | 1230 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) |
d50171e4 | 1231 | return 0; |
0d62e5e8 | 1232 | |
d50171e4 | 1233 | return lwp->status_pending_p; |
0d62e5e8 DJ |
1234 | } |
1235 | ||
95954743 PA |
1236 | static int |
1237 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1238 | { | |
1239 | ptid_t ptid = *(ptid_t *) data; | |
1240 | int lwp; | |
1241 | ||
1242 | if (ptid_get_lwp (ptid) != 0) | |
1243 | lwp = ptid_get_lwp (ptid); | |
1244 | else | |
1245 | lwp = ptid_get_pid (ptid); | |
1246 | ||
1247 | if (ptid_get_lwp (entry->id) == lwp) | |
1248 | return 1; | |
1249 | ||
1250 | return 0; | |
1251 | } | |
1252 | ||
1253 | struct lwp_info * | |
1254 | find_lwp_pid (ptid_t ptid) | |
1255 | { | |
d86d4aaf DE |
1256 | struct inferior_list_entry *thread |
1257 | = find_inferior (&all_threads, same_lwp, &ptid); | |
1258 | ||
1259 | if (thread == NULL) | |
1260 | return NULL; | |
1261 | ||
1262 | return get_thread_lwp ((struct thread_info *) thread); | |
95954743 PA |
1263 | } |
1264 | ||
fa96cb38 | 1265 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1266 | |
fa96cb38 PA |
1267 | static int |
1268 | num_lwps (int pid) | |
1269 | { | |
1270 | struct inferior_list_entry *inf, *tmp; | |
1271 | int count = 0; | |
0d62e5e8 | 1272 | |
fa96cb38 | 1273 | ALL_INFERIORS (&all_threads, inf, tmp) |
24a09b5f | 1274 | { |
fa96cb38 PA |
1275 | if (ptid_get_pid (inf->id) == pid) |
1276 | count++; | |
24a09b5f | 1277 | } |
3aee8918 | 1278 | |
fa96cb38 PA |
1279 | return count; |
1280 | } | |
d61ddec4 | 1281 | |
fa96cb38 PA |
1282 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1283 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1284 | |
fa96cb38 PA |
1285 | static void |
1286 | check_zombie_leaders (void) | |
1287 | { | |
1288 | struct process_info *proc, *tmp; | |
c3adc08c | 1289 | |
fa96cb38 | 1290 | ALL_PROCESSES (proc, tmp) |
c3adc08c | 1291 | { |
fa96cb38 PA |
1292 | pid_t leader_pid = pid_of (proc); |
1293 | struct lwp_info *leader_lp; | |
c3adc08c | 1294 | |
fa96cb38 | 1295 | leader_lp = find_lwp_pid (pid_to_ptid (leader_pid)); |
c3adc08c | 1296 | |
fa96cb38 PA |
1297 | if (debug_threads) |
1298 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1299 | "num_lwps=%d, zombie=%d\n", | |
1300 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1301 | linux_proc_pid_is_zombie (leader_pid)); | |
1302 | ||
1303 | if (leader_lp != NULL | |
1304 | /* Check if there are other threads in the group, as we may | |
1305 | have raced with the inferior simply exiting. */ | |
1306 | && !last_thread_of_process_p (leader_pid) | |
1307 | && linux_proc_pid_is_zombie (leader_pid)) | |
1308 | { | |
1309 | /* A leader zombie can mean one of two things: | |
1310 | ||
1311 | - It exited, and there's an exit status pending | |
1312 | available, or only the leader exited (not the whole | |
1313 | program). In the latter case, we can't waitpid the | |
1314 | leader's exit status until all other threads are gone. | |
1315 | ||
1316 | - There are 3 or more threads in the group, and a thread | |
1317 | other than the leader exec'd. On an exec, the Linux | |
1318 | kernel destroys all other threads (except the execing | |
1319 | one) in the thread group, and resets the execing thread's | |
1320 | tid to the tgid. No exit notification is sent for the | |
1321 | execing thread -- from the ptracer's perspective, it | |
1322 | appears as though the execing thread just vanishes. | |
1323 | Until we reap all other threads except the leader and the | |
1324 | execing thread, the leader will be zombie, and the | |
1325 | execing thread will be in `D (disc sleep)'. As soon as | |
1326 | all other threads are reaped, the execing thread changes | |
1327 | it's tid to the tgid, and the previous (zombie) leader | |
1328 | vanishes, giving place to the "new" leader. We could try | |
1329 | distinguishing the exit and exec cases, by waiting once | |
1330 | more, and seeing if something comes out, but it doesn't | |
1331 | sound useful. The previous leader _does_ go away, and | |
1332 | we'll re-add the new one once we see the exec event | |
1333 | (which is just the same as what would happen if the | |
1334 | previous leader did exit voluntarily before some other | |
1335 | thread execs). */ | |
c3adc08c | 1336 | |
fa96cb38 PA |
1337 | if (debug_threads) |
1338 | fprintf (stderr, | |
1339 | "CZL: Thread group leader %d zombie " | |
1340 | "(it exited, or another thread execd).\n", | |
1341 | leader_pid); | |
c3adc08c | 1342 | |
fa96cb38 | 1343 | delete_lwp (leader_lp); |
c3adc08c PA |
1344 | } |
1345 | } | |
fa96cb38 | 1346 | } |
c3adc08c | 1347 | |
fa96cb38 PA |
1348 | /* Callback for `find_inferior'. Returns the first LWP that is not |
1349 | stopped. ARG is a PTID filter. */ | |
d50171e4 | 1350 | |
fa96cb38 PA |
1351 | static int |
1352 | not_stopped_callback (struct inferior_list_entry *entry, void *arg) | |
1353 | { | |
1354 | struct thread_info *thr = (struct thread_info *) entry; | |
1355 | struct lwp_info *lwp; | |
1356 | ptid_t filter = *(ptid_t *) arg; | |
47c0c975 | 1357 | |
fa96cb38 PA |
1358 | if (!ptid_match (ptid_of (thr), filter)) |
1359 | return 0; | |
bd99dc85 | 1360 | |
fa96cb38 PA |
1361 | lwp = get_thread_lwp (thr); |
1362 | if (!lwp->stopped) | |
1363 | return 1; | |
1364 | ||
1365 | return 0; | |
0d62e5e8 | 1366 | } |
611cb4a5 | 1367 | |
219f2f23 PA |
1368 | /* This function should only be called if the LWP got a SIGTRAP. |
1369 | ||
1370 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1371 | event was handled, 0 otherwise. */ | |
1372 | ||
1373 | static int | |
1374 | handle_tracepoints (struct lwp_info *lwp) | |
1375 | { | |
1376 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1377 | int tpoint_related_event = 0; | |
1378 | ||
7984d532 PA |
1379 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1380 | uninsert tracepoints. To do this, we temporarily pause all | |
1381 | threads, unpatch away, and then unpause threads. We need to make | |
1382 | sure the unpausing doesn't resume LWP too. */ | |
1383 | lwp->suspended++; | |
1384 | ||
219f2f23 PA |
1385 | /* And we need to be sure that any all-threads-stopping doesn't try |
1386 | to move threads out of the jump pads, as it could deadlock the | |
1387 | inferior (LWP could be in the jump pad, maybe even holding the | |
1388 | lock.) */ | |
1389 | ||
1390 | /* Do any necessary step collect actions. */ | |
1391 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1392 | ||
fa593d66 PA |
1393 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1394 | ||
219f2f23 PA |
1395 | /* See if we just hit a tracepoint and do its main collect |
1396 | actions. */ | |
1397 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1398 | ||
7984d532 PA |
1399 | lwp->suspended--; |
1400 | ||
1401 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1402 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1403 | |
219f2f23 PA |
1404 | if (tpoint_related_event) |
1405 | { | |
1406 | if (debug_threads) | |
87ce2a04 | 1407 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1408 | return 1; |
1409 | } | |
1410 | ||
1411 | return 0; | |
1412 | } | |
1413 | ||
fa593d66 PA |
1414 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1415 | fast tracepoint. */ | |
1416 | ||
1417 | static int | |
1418 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1419 | struct fast_tpoint_collect_status *status) | |
1420 | { | |
1421 | CORE_ADDR thread_area; | |
d86d4aaf | 1422 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1423 | |
1424 | if (the_low_target.get_thread_area == NULL) | |
1425 | return 0; | |
1426 | ||
1427 | /* Get the thread area address. This is used to recognize which | |
1428 | thread is which when tracing with the in-process agent library. | |
1429 | We don't read anything from the address, and treat it as opaque; | |
1430 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 1431 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
fa593d66 PA |
1432 | return 0; |
1433 | ||
1434 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1435 | } | |
1436 | ||
1437 | /* The reason we resume in the caller, is because we want to be able | |
1438 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1439 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1440 | refuses to resume. */ | |
1441 | ||
1442 | static int | |
1443 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1444 | { | |
1445 | struct thread_info *saved_inferior; | |
1446 | ||
1447 | saved_inferior = current_inferior; | |
1448 | current_inferior = get_lwp_thread (lwp); | |
1449 | ||
1450 | if ((wstat == NULL | |
1451 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1452 | && supports_fast_tracepoints () | |
58b4daa5 | 1453 | && agent_loaded_p ()) |
fa593d66 PA |
1454 | { |
1455 | struct fast_tpoint_collect_status status; | |
1456 | int r; | |
1457 | ||
1458 | if (debug_threads) | |
87ce2a04 DE |
1459 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1460 | "jump pad.\n", | |
d86d4aaf | 1461 | lwpid_of (current_inferior)); |
fa593d66 PA |
1462 | |
1463 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1464 | ||
1465 | if (wstat == NULL | |
1466 | || (WSTOPSIG (*wstat) != SIGILL | |
1467 | && WSTOPSIG (*wstat) != SIGFPE | |
1468 | && WSTOPSIG (*wstat) != SIGSEGV | |
1469 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1470 | { | |
1471 | lwp->collecting_fast_tracepoint = r; | |
1472 | ||
1473 | if (r != 0) | |
1474 | { | |
1475 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1476 | { | |
1477 | /* Haven't executed the original instruction yet. | |
1478 | Set breakpoint there, and wait till it's hit, | |
1479 | then single-step until exiting the jump pad. */ | |
1480 | lwp->exit_jump_pad_bkpt | |
1481 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1482 | } | |
1483 | ||
1484 | if (debug_threads) | |
87ce2a04 DE |
1485 | debug_printf ("Checking whether LWP %ld needs to move out of " |
1486 | "the jump pad...it does\n", | |
d86d4aaf | 1487 | lwpid_of (current_inferior)); |
0cccb683 | 1488 | current_inferior = saved_inferior; |
fa593d66 PA |
1489 | |
1490 | return 1; | |
1491 | } | |
1492 | } | |
1493 | else | |
1494 | { | |
1495 | /* If we get a synchronous signal while collecting, *and* | |
1496 | while executing the (relocated) original instruction, | |
1497 | reset the PC to point at the tpoint address, before | |
1498 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1499 | report the signal to GDB, and pray for the best. */ | |
1500 | ||
1501 | lwp->collecting_fast_tracepoint = 0; | |
1502 | ||
1503 | if (r != 0 | |
1504 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1505 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1506 | { | |
1507 | siginfo_t info; | |
1508 | struct regcache *regcache; | |
1509 | ||
1510 | /* The si_addr on a few signals references the address | |
1511 | of the faulting instruction. Adjust that as | |
1512 | well. */ | |
1513 | if ((WSTOPSIG (*wstat) == SIGILL | |
1514 | || WSTOPSIG (*wstat) == SIGFPE | |
1515 | || WSTOPSIG (*wstat) == SIGBUS | |
1516 | || WSTOPSIG (*wstat) == SIGSEGV) | |
d86d4aaf | 1517 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_inferior), |
b8e1b30e | 1518 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
1519 | /* Final check just to make sure we don't clobber |
1520 | the siginfo of non-kernel-sent signals. */ | |
1521 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1522 | { | |
1523 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
d86d4aaf | 1524 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_inferior), |
b8e1b30e | 1525 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
1526 | } |
1527 | ||
d86d4aaf | 1528 | regcache = get_thread_regcache (current_inferior, 1); |
fa593d66 PA |
1529 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
1530 | lwp->stop_pc = status.tpoint_addr; | |
1531 | ||
1532 | /* Cancel any fast tracepoint lock this thread was | |
1533 | holding. */ | |
1534 | force_unlock_trace_buffer (); | |
1535 | } | |
1536 | ||
1537 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1538 | { | |
1539 | if (debug_threads) | |
87ce2a04 DE |
1540 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
1541 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
1542 | |
1543 | stop_all_lwps (1, lwp); | |
1544 | cancel_breakpoints (); | |
1545 | ||
1546 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1547 | lwp->exit_jump_pad_bkpt = NULL; | |
1548 | ||
1549 | unstop_all_lwps (1, lwp); | |
1550 | ||
1551 | gdb_assert (lwp->suspended >= 0); | |
1552 | } | |
1553 | } | |
1554 | } | |
1555 | ||
1556 | if (debug_threads) | |
87ce2a04 DE |
1557 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1558 | "jump pad...no\n", | |
d86d4aaf | 1559 | lwpid_of (current_inferior)); |
0cccb683 YQ |
1560 | |
1561 | current_inferior = saved_inferior; | |
fa593d66 PA |
1562 | return 0; |
1563 | } | |
1564 | ||
1565 | /* Enqueue one signal in the "signals to report later when out of the | |
1566 | jump pad" list. */ | |
1567 | ||
1568 | static void | |
1569 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1570 | { | |
1571 | struct pending_signals *p_sig; | |
d86d4aaf | 1572 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1573 | |
1574 | if (debug_threads) | |
87ce2a04 | 1575 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 1576 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1577 | |
1578 | if (debug_threads) | |
1579 | { | |
1580 | struct pending_signals *sig; | |
1581 | ||
1582 | for (sig = lwp->pending_signals_to_report; | |
1583 | sig != NULL; | |
1584 | sig = sig->prev) | |
87ce2a04 DE |
1585 | debug_printf (" Already queued %d\n", |
1586 | sig->signal); | |
fa593d66 | 1587 | |
87ce2a04 | 1588 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
1589 | } |
1590 | ||
1a981360 PA |
1591 | /* Don't enqueue non-RT signals if they are already in the deferred |
1592 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1593 | twice) */ | |
1594 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1595 | { | |
1596 | struct pending_signals *sig; | |
1597 | ||
1598 | for (sig = lwp->pending_signals_to_report; | |
1599 | sig != NULL; | |
1600 | sig = sig->prev) | |
1601 | { | |
1602 | if (sig->signal == WSTOPSIG (*wstat)) | |
1603 | { | |
1604 | if (debug_threads) | |
87ce2a04 DE |
1605 | debug_printf ("Not requeuing already queued non-RT signal %d" |
1606 | " for LWP %ld\n", | |
1607 | sig->signal, | |
d86d4aaf | 1608 | lwpid_of (thread)); |
1a981360 PA |
1609 | return; |
1610 | } | |
1611 | } | |
1612 | } | |
1613 | ||
fa593d66 PA |
1614 | p_sig = xmalloc (sizeof (*p_sig)); |
1615 | p_sig->prev = lwp->pending_signals_to_report; | |
1616 | p_sig->signal = WSTOPSIG (*wstat); | |
1617 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
d86d4aaf | 1618 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1619 | &p_sig->info); |
fa593d66 PA |
1620 | |
1621 | lwp->pending_signals_to_report = p_sig; | |
1622 | } | |
1623 | ||
1624 | /* Dequeue one signal from the "signals to report later when out of | |
1625 | the jump pad" list. */ | |
1626 | ||
1627 | static int | |
1628 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1629 | { | |
d86d4aaf DE |
1630 | struct thread_info *thread = get_lwp_thread (lwp); |
1631 | ||
fa593d66 PA |
1632 | if (lwp->pending_signals_to_report != NULL) |
1633 | { | |
1634 | struct pending_signals **p_sig; | |
1635 | ||
1636 | p_sig = &lwp->pending_signals_to_report; | |
1637 | while ((*p_sig)->prev != NULL) | |
1638 | p_sig = &(*p_sig)->prev; | |
1639 | ||
1640 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1641 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 1642 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1643 | &(*p_sig)->info); |
fa593d66 PA |
1644 | free (*p_sig); |
1645 | *p_sig = NULL; | |
1646 | ||
1647 | if (debug_threads) | |
87ce2a04 | 1648 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 1649 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1650 | |
1651 | if (debug_threads) | |
1652 | { | |
1653 | struct pending_signals *sig; | |
1654 | ||
1655 | for (sig = lwp->pending_signals_to_report; | |
1656 | sig != NULL; | |
1657 | sig = sig->prev) | |
87ce2a04 DE |
1658 | debug_printf (" Still queued %d\n", |
1659 | sig->signal); | |
fa593d66 | 1660 | |
87ce2a04 | 1661 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
1662 | } |
1663 | ||
1664 | return 1; | |
1665 | } | |
1666 | ||
1667 | return 0; | |
1668 | } | |
1669 | ||
d50171e4 PA |
1670 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1671 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1672 | will handle the current event, eventually we will resume this LWP, | |
1673 | and this breakpoint will trap again. */ | |
1674 | ||
1675 | static int | |
1676 | cancel_breakpoint (struct lwp_info *lwp) | |
1677 | { | |
1678 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1679 | |
1680 | /* There's nothing to do if we don't support breakpoints. */ | |
1681 | if (!supports_breakpoints ()) | |
1682 | return 0; | |
1683 | ||
d50171e4 PA |
1684 | /* breakpoint_at reads from current inferior. */ |
1685 | saved_inferior = current_inferior; | |
1686 | current_inferior = get_lwp_thread (lwp); | |
1687 | ||
1688 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1689 | { | |
1690 | if (debug_threads) | |
87ce2a04 | 1691 | debug_printf ("CB: Push back breakpoint for %s\n", |
d86d4aaf | 1692 | target_pid_to_str (ptid_of (current_inferior))); |
d50171e4 PA |
1693 | |
1694 | /* Back up the PC if necessary. */ | |
1695 | if (the_low_target.decr_pc_after_break) | |
1696 | { | |
1697 | struct regcache *regcache | |
fc7238bb | 1698 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1699 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1700 | } | |
1701 | ||
1702 | current_inferior = saved_inferior; | |
1703 | return 1; | |
1704 | } | |
1705 | else | |
1706 | { | |
1707 | if (debug_threads) | |
87ce2a04 DE |
1708 | debug_printf ("CB: No breakpoint found at %s for [%s]\n", |
1709 | paddress (lwp->stop_pc), | |
d86d4aaf | 1710 | target_pid_to_str (ptid_of (current_inferior))); |
d50171e4 PA |
1711 | } |
1712 | ||
1713 | current_inferior = saved_inferior; | |
1714 | return 0; | |
1715 | } | |
1716 | ||
fa96cb38 PA |
1717 | /* Do low-level handling of the event, and check if we should go on |
1718 | and pass it to caller code. Return the affected lwp if we are, or | |
1719 | NULL otherwise. */ | |
1720 | ||
1721 | static struct lwp_info * | |
1722 | linux_low_filter_event (ptid_t filter_ptid, int lwpid, int wstat) | |
1723 | { | |
1724 | struct lwp_info *child; | |
1725 | struct thread_info *thread; | |
1726 | ||
1727 | child = find_lwp_pid (pid_to_ptid (lwpid)); | |
1728 | ||
1729 | /* If we didn't find a process, one of two things presumably happened: | |
1730 | - A process we started and then detached from has exited. Ignore it. | |
1731 | - A process we are controlling has forked and the new child's stop | |
1732 | was reported to us by the kernel. Save its PID. */ | |
1733 | if (child == NULL && WIFSTOPPED (wstat)) | |
1734 | { | |
1735 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
1736 | return NULL; | |
1737 | } | |
1738 | else if (child == NULL) | |
1739 | return NULL; | |
1740 | ||
1741 | thread = get_lwp_thread (child); | |
1742 | ||
1743 | child->stopped = 1; | |
1744 | ||
1745 | child->last_status = wstat; | |
1746 | ||
1747 | if (WIFSTOPPED (wstat)) | |
1748 | { | |
1749 | struct process_info *proc; | |
1750 | ||
1751 | /* Architecture-specific setup after inferior is running. This | |
1752 | needs to happen after we have attached to the inferior and it | |
1753 | is stopped for the first time, but before we access any | |
1754 | inferior registers. */ | |
1755 | proc = find_process_pid (pid_of (thread)); | |
1756 | if (proc->private->new_inferior) | |
1757 | { | |
1758 | struct thread_info *saved_inferior; | |
1759 | ||
1760 | saved_inferior = current_inferior; | |
1761 | current_inferior = thread; | |
1762 | ||
1763 | the_low_target.arch_setup (); | |
1764 | ||
1765 | current_inferior = saved_inferior; | |
1766 | ||
1767 | proc->private->new_inferior = 0; | |
1768 | } | |
1769 | } | |
1770 | ||
1771 | /* Store the STOP_PC, with adjustment applied. This depends on the | |
1772 | architecture being defined already (so that CHILD has a valid | |
1773 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1774 | not). */ | |
1775 | if (WIFSTOPPED (wstat)) | |
1776 | { | |
1777 | if (debug_threads | |
1778 | && the_low_target.get_pc != NULL) | |
1779 | { | |
1780 | struct thread_info *saved_inferior; | |
1781 | struct regcache *regcache; | |
1782 | CORE_ADDR pc; | |
1783 | ||
1784 | saved_inferior = current_inferior; | |
1785 | current_inferior = thread; | |
1786 | regcache = get_thread_regcache (current_inferior, 1); | |
1787 | pc = (*the_low_target.get_pc) (regcache); | |
1788 | debug_printf ("linux_low_filter_event: pc is 0x%lx\n", (long) pc); | |
1789 | current_inferior = saved_inferior; | |
1790 | } | |
1791 | ||
1792 | child->stop_pc = get_stop_pc (child); | |
1793 | } | |
1794 | ||
1795 | /* Fetch the possibly triggered data watchpoint info and store it in | |
1796 | CHILD. | |
1797 | ||
1798 | On some archs, like x86, that use debug registers to set | |
1799 | watchpoints, it's possible that the way to know which watched | |
1800 | address trapped, is to check the register that is used to select | |
1801 | which address to watch. Problem is, between setting the | |
1802 | watchpoint and reading back which data address trapped, the user | |
1803 | may change the set of watchpoints, and, as a consequence, GDB | |
1804 | changes the debug registers in the inferior. To avoid reading | |
1805 | back a stale stopped-data-address when that happens, we cache in | |
1806 | LP the fact that a watchpoint trapped, and the corresponding data | |
1807 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1808 | changes the debug registers meanwhile, we have the cached data we | |
1809 | can rely on. */ | |
1810 | ||
1811 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP) | |
1812 | { | |
1813 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1814 | { | |
1815 | child->stopped_by_watchpoint = 0; | |
1816 | } | |
1817 | else | |
1818 | { | |
1819 | struct thread_info *saved_inferior; | |
1820 | ||
1821 | saved_inferior = current_inferior; | |
1822 | current_inferior = thread; | |
1823 | ||
1824 | child->stopped_by_watchpoint | |
1825 | = the_low_target.stopped_by_watchpoint (); | |
1826 | ||
1827 | if (child->stopped_by_watchpoint) | |
1828 | { | |
1829 | if (the_low_target.stopped_data_address != NULL) | |
1830 | child->stopped_data_address | |
1831 | = the_low_target.stopped_data_address (); | |
1832 | else | |
1833 | child->stopped_data_address = 0; | |
1834 | } | |
1835 | ||
1836 | current_inferior = saved_inferior; | |
1837 | } | |
1838 | } | |
1839 | ||
1840 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) | |
1841 | { | |
1842 | linux_enable_event_reporting (lwpid); | |
1843 | child->must_set_ptrace_flags = 0; | |
1844 | } | |
1845 | ||
1846 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP | |
1847 | && wstat >> 16 != 0) | |
1848 | { | |
1849 | handle_extended_wait (child, wstat); | |
1850 | return NULL; | |
1851 | } | |
1852 | ||
1853 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP | |
1854 | && child->stop_expected) | |
1855 | { | |
1856 | if (debug_threads) | |
1857 | debug_printf ("Expected stop.\n"); | |
1858 | child->stop_expected = 0; | |
1859 | ||
1860 | if (thread->last_resume_kind == resume_stop) | |
1861 | { | |
1862 | /* We want to report the stop to the core. Treat the | |
1863 | SIGSTOP as a normal event. */ | |
1864 | } | |
1865 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
1866 | { | |
1867 | /* Stopping threads. We don't want this SIGSTOP to end up | |
1868 | pending in the FILTER_PTID handling below. */ | |
1869 | return NULL; | |
1870 | } | |
1871 | else | |
1872 | { | |
1873 | /* Filter out the event. */ | |
1874 | linux_resume_one_lwp (child, child->stepping, 0, NULL); | |
1875 | return NULL; | |
1876 | } | |
1877 | } | |
1878 | ||
1879 | /* Check if the thread has exited. */ | |
1880 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat)) | |
1881 | && num_lwps (pid_of (thread)) > 1) | |
1882 | { | |
1883 | if (debug_threads) | |
1884 | debug_printf ("LLW: %d exited.\n", lwpid); | |
1885 | ||
1886 | /* If there is at least one more LWP, then the exit signal | |
1887 | was not the end of the debugged application and should be | |
1888 | ignored. */ | |
1889 | delete_lwp (child); | |
1890 | return NULL; | |
1891 | } | |
1892 | ||
1893 | if (!ptid_match (ptid_of (thread), filter_ptid)) | |
1894 | { | |
1895 | if (debug_threads) | |
1896 | debug_printf ("LWP %d got an event %06x, leaving pending.\n", | |
1897 | lwpid, wstat); | |
1898 | ||
1899 | if (WIFSTOPPED (wstat)) | |
1900 | { | |
1901 | child->status_pending_p = 1; | |
1902 | child->status_pending = wstat; | |
1903 | ||
1904 | if (WSTOPSIG (wstat) != SIGSTOP) | |
1905 | { | |
1906 | /* Cancel breakpoint hits. The breakpoint may be | |
1907 | removed before we fetch events from this process to | |
1908 | report to the core. It is best not to assume the | |
1909 | moribund breakpoints heuristic always handles these | |
1910 | cases --- it could be too many events go through to | |
1911 | the core before this one is handled. All-stop always | |
1912 | cancels breakpoint hits in all threads. */ | |
1913 | if (non_stop | |
1914 | && WSTOPSIG (wstat) == SIGTRAP | |
1915 | && cancel_breakpoint (child)) | |
1916 | { | |
1917 | /* Throw away the SIGTRAP. */ | |
1918 | child->status_pending_p = 0; | |
1919 | ||
1920 | if (debug_threads) | |
1921 | debug_printf ("LLW: LWP %d hit a breakpoint while" | |
1922 | " waiting for another process;" | |
1923 | " cancelled it\n", lwpid); | |
1924 | } | |
1925 | } | |
1926 | } | |
1927 | else if (WIFEXITED (wstat) || WIFSIGNALED (wstat)) | |
1928 | { | |
1929 | if (debug_threads) | |
1930 | debug_printf ("LLWE: process %d exited while fetching " | |
1931 | "event from another LWP\n", lwpid); | |
1932 | ||
1933 | /* This was the last lwp in the process. Since events are | |
1934 | serialized to GDB core, and we can't report this one | |
1935 | right now, but GDB core and the other target layers will | |
1936 | want to be notified about the exit code/signal, leave the | |
1937 | status pending for the next time we're able to report | |
1938 | it. */ | |
1939 | mark_lwp_dead (child, wstat); | |
1940 | } | |
1941 | ||
1942 | return NULL; | |
1943 | } | |
1944 | ||
1945 | return child; | |
1946 | } | |
1947 | ||
d50171e4 PA |
1948 | /* When the event-loop is doing a step-over, this points at the thread |
1949 | being stepped. */ | |
1950 | ptid_t step_over_bkpt; | |
1951 | ||
fa96cb38 PA |
1952 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
1953 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
1954 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
1955 | lwps of a thread group; or a PTID representing a single lwp. Store | |
1956 | the stop status through the status pointer WSTAT. OPTIONS is | |
1957 | passed to the waitpid call. Return 0 if no event was found and | |
1958 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
1959 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 1960 | |
0d62e5e8 | 1961 | static int |
fa96cb38 PA |
1962 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
1963 | int *wstatp, int options) | |
0d62e5e8 | 1964 | { |
d86d4aaf | 1965 | struct thread_info *event_thread; |
d50171e4 | 1966 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 1967 | sigset_t block_mask, prev_mask; |
d50171e4 | 1968 | |
fa96cb38 | 1969 | retry: |
d86d4aaf DE |
1970 | /* N.B. event_thread points to the thread_info struct that contains |
1971 | event_child. Keep them in sync. */ | |
1972 | event_thread = NULL; | |
d50171e4 PA |
1973 | event_child = NULL; |
1974 | requested_child = NULL; | |
0d62e5e8 | 1975 | |
95954743 | 1976 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1977 | |
fa96cb38 | 1978 | if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid)) |
0d62e5e8 | 1979 | { |
d86d4aaf | 1980 | event_thread = (struct thread_info *) |
fa96cb38 | 1981 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); |
d86d4aaf DE |
1982 | if (event_thread != NULL) |
1983 | event_child = get_thread_lwp (event_thread); | |
1984 | if (debug_threads && event_thread) | |
1985 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 1986 | } |
fa96cb38 | 1987 | else if (!ptid_equal (filter_ptid, null_ptid)) |
0d62e5e8 | 1988 | { |
fa96cb38 | 1989 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 1990 | |
bde24c0a | 1991 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
1992 | && requested_child->status_pending_p |
1993 | && requested_child->collecting_fast_tracepoint) | |
1994 | { | |
1995 | enqueue_one_deferred_signal (requested_child, | |
1996 | &requested_child->status_pending); | |
1997 | requested_child->status_pending_p = 0; | |
1998 | requested_child->status_pending = 0; | |
1999 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2000 | } | |
2001 | ||
2002 | if (requested_child->suspended | |
2003 | && requested_child->status_pending_p) | |
2004 | fatal ("requesting an event out of a suspended child?"); | |
2005 | ||
d50171e4 | 2006 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2007 | { |
2008 | event_child = requested_child; | |
2009 | event_thread = get_lwp_thread (event_child); | |
2010 | } | |
0d62e5e8 | 2011 | } |
611cb4a5 | 2012 | |
0d62e5e8 DJ |
2013 | if (event_child != NULL) |
2014 | { | |
bd99dc85 | 2015 | if (debug_threads) |
87ce2a04 | 2016 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2017 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2018 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2019 | event_child->status_pending_p = 0; |
2020 | event_child->status_pending = 0; | |
d86d4aaf DE |
2021 | current_inferior = event_thread; |
2022 | return lwpid_of (event_thread); | |
0d62e5e8 DJ |
2023 | } |
2024 | ||
fa96cb38 PA |
2025 | /* But if we don't find a pending event, we'll have to wait. |
2026 | ||
2027 | We only enter this loop if no process has a pending wait status. | |
2028 | Thus any action taken in response to a wait status inside this | |
2029 | loop is responding as soon as we detect the status, not after any | |
2030 | pending events. */ | |
d8301ad1 | 2031 | |
fa96cb38 PA |
2032 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2033 | all signals while here. */ | |
2034 | sigfillset (&block_mask); | |
2035 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2036 | ||
2037 | while (event_child == NULL) | |
0d62e5e8 | 2038 | { |
fa96cb38 | 2039 | pid_t ret = 0; |
0d62e5e8 | 2040 | |
fa96cb38 PA |
2041 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2042 | quirks: | |
0d62e5e8 | 2043 | |
fa96cb38 PA |
2044 | - If the thread group leader exits while other threads in the |
2045 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2046 | waitpid won't return an exit status until the other threads | |
2047 | in the group are reaped. | |
611cb4a5 | 2048 | |
fa96cb38 PA |
2049 | - When a non-leader thread execs, that thread just vanishes |
2050 | without reporting an exit (so we'd hang if we waited for it | |
2051 | explicitly in that case). The exec event is reported to | |
2052 | the TGID pid (although we don't currently enable exec | |
2053 | events). */ | |
2054 | errno = 0; | |
2055 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2056 | |
fa96cb38 PA |
2057 | if (debug_threads) |
2058 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2059 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2060 | |
fa96cb38 | 2061 | if (ret > 0) |
0d62e5e8 | 2062 | { |
89be2091 | 2063 | if (debug_threads) |
bd99dc85 | 2064 | { |
fa96cb38 PA |
2065 | debug_printf ("LLW: waitpid %ld received %s\n", |
2066 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2067 | } |
89be2091 | 2068 | |
fa96cb38 PA |
2069 | event_child = linux_low_filter_event (filter_ptid, |
2070 | ret, *wstatp); | |
2071 | if (event_child != NULL) | |
bd99dc85 | 2072 | { |
fa96cb38 PA |
2073 | /* We got an event to report to the core. */ |
2074 | event_thread = get_lwp_thread (event_child); | |
2075 | break; | |
bd99dc85 | 2076 | } |
89be2091 | 2077 | |
fa96cb38 PA |
2078 | /* Retry until nothing comes out of waitpid. A single |
2079 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2080 | continue; |
2081 | } | |
2082 | ||
fa96cb38 PA |
2083 | /* Check for zombie thread group leaders. Those can't be reaped |
2084 | until all other threads in the thread group are. */ | |
2085 | check_zombie_leaders (); | |
2086 | ||
2087 | /* If there are no resumed children left in the set of LWPs we | |
2088 | want to wait for, bail. We can't just block in | |
2089 | waitpid/sigsuspend, because lwps might have been left stopped | |
2090 | in trace-stop state, and we'd be stuck forever waiting for | |
2091 | their status to change (which would only happen if we resumed | |
2092 | them). Even if WNOHANG is set, this return code is preferred | |
2093 | over 0 (below), as it is more detailed. */ | |
2094 | if ((find_inferior (&all_threads, | |
2095 | not_stopped_callback, | |
2096 | &wait_ptid) == NULL)) | |
a6dbe5df | 2097 | { |
fa96cb38 PA |
2098 | if (debug_threads) |
2099 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2100 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2101 | return -1; | |
a6dbe5df PA |
2102 | } |
2103 | ||
fa96cb38 PA |
2104 | /* No interesting event to report to the caller. */ |
2105 | if ((options & WNOHANG)) | |
24a09b5f | 2106 | { |
fa96cb38 PA |
2107 | if (debug_threads) |
2108 | debug_printf ("WNOHANG set, no event found\n"); | |
2109 | ||
2110 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2111 | return 0; | |
24a09b5f DJ |
2112 | } |
2113 | ||
fa96cb38 PA |
2114 | /* Block until we get an event reported with SIGCHLD. */ |
2115 | if (debug_threads) | |
2116 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2117 | |
fa96cb38 PA |
2118 | sigsuspend (&prev_mask); |
2119 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2120 | goto retry; | |
2121 | } | |
d50171e4 | 2122 | |
fa96cb38 | 2123 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2124 | |
fa96cb38 | 2125 | current_inferior = event_thread; |
d50171e4 | 2126 | |
fa96cb38 PA |
2127 | /* Check for thread exit. */ |
2128 | if (! WIFSTOPPED (*wstatp)) | |
2129 | { | |
2130 | gdb_assert (last_thread_of_process_p (pid_of (event_thread))); | |
2131 | ||
2132 | if (debug_threads) | |
2133 | debug_printf ("LWP %d is the last lwp of process. " | |
2134 | "Process %ld exiting.\n", | |
2135 | pid_of (event_thread), lwpid_of (event_thread)); | |
d86d4aaf | 2136 | return lwpid_of (event_thread); |
611cb4a5 | 2137 | } |
0d62e5e8 | 2138 | |
fa96cb38 PA |
2139 | return lwpid_of (event_thread); |
2140 | } | |
2141 | ||
2142 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2143 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2144 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2145 | the stop status through the status pointer WSTAT. OPTIONS is | |
2146 | passed to the waitpid call. Return 0 if no event was found and | |
2147 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2148 | was found. Return the PID of the stopped child otherwise. */ | |
2149 | ||
2150 | static int | |
2151 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2152 | { | |
2153 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2154 | } |
2155 | ||
6bf5e0ba PA |
2156 | /* Count the LWP's that have had events. */ |
2157 | ||
2158 | static int | |
2159 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2160 | { | |
d86d4aaf DE |
2161 | struct thread_info *thread = (struct thread_info *) entry; |
2162 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba PA |
2163 | int *count = data; |
2164 | ||
2165 | gdb_assert (count != NULL); | |
2166 | ||
2167 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
2168 | should be reported to GDB. */ | |
8336d594 PA |
2169 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2170 | && thread->last_resume_kind != resume_stop | |
6bf5e0ba PA |
2171 | && lp->status_pending_p |
2172 | && WIFSTOPPED (lp->status_pending) | |
2173 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
2174 | && !breakpoint_inserted_here (lp->stop_pc)) | |
2175 | (*count)++; | |
2176 | ||
2177 | return 0; | |
2178 | } | |
2179 | ||
2180 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2181 | ||
2182 | static int | |
2183 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2184 | { | |
d86d4aaf DE |
2185 | struct thread_info *thread = (struct thread_info *) entry; |
2186 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba | 2187 | |
8336d594 PA |
2188 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2189 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2190 | && lp->status_pending_p) |
2191 | return 1; | |
2192 | else | |
2193 | return 0; | |
2194 | } | |
2195 | ||
2196 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
2197 | reported to GDB. */ | |
2198 | ||
2199 | static int | |
2200 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2201 | { | |
d86d4aaf DE |
2202 | struct thread_info *thread = (struct thread_info *) entry; |
2203 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba PA |
2204 | int *selector = data; |
2205 | ||
2206 | gdb_assert (selector != NULL); | |
2207 | ||
2208 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
2209 | if (thread->last_resume_kind != resume_stop |
2210 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2211 | && lp->status_pending_p |
2212 | && WIFSTOPPED (lp->status_pending) | |
2213 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
2214 | && !breakpoint_inserted_here (lp->stop_pc)) | |
2215 | if ((*selector)-- == 0) | |
2216 | return 1; | |
2217 | ||
2218 | return 0; | |
2219 | } | |
2220 | ||
2221 | static int | |
2222 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
2223 | { | |
d86d4aaf DE |
2224 | struct thread_info *thread = (struct thread_info *) entry; |
2225 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba PA |
2226 | struct lwp_info *event_lp = data; |
2227 | ||
2228 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2229 | if (lp == event_lp) | |
2230 | return 0; | |
2231 | ||
2232 | /* If a LWP other than the LWP that we're reporting an event for has | |
2233 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2234 | then just arrange for it to hit it again later. We don't keep | |
2235 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2236 | LWP. We will handle the current event, eventually we will resume | |
2237 | all LWPs, and this one will get its breakpoint trap again. | |
2238 | ||
2239 | If we do not do this, then we run the risk that the user will | |
2240 | delete or disable the breakpoint, but the LWP will have already | |
2241 | tripped on it. */ | |
2242 | ||
8336d594 PA |
2243 | if (thread->last_resume_kind != resume_stop |
2244 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2245 | && lp->status_pending_p |
2246 | && WIFSTOPPED (lp->status_pending) | |
2247 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
2248 | && !lp->stepping |
2249 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
2250 | && cancel_breakpoint (lp)) |
2251 | /* Throw away the SIGTRAP. */ | |
2252 | lp->status_pending_p = 0; | |
2253 | ||
2254 | return 0; | |
2255 | } | |
2256 | ||
7984d532 PA |
2257 | static void |
2258 | linux_cancel_breakpoints (void) | |
2259 | { | |
d86d4aaf | 2260 | find_inferior (&all_threads, cancel_breakpoints_callback, NULL); |
7984d532 PA |
2261 | } |
2262 | ||
6bf5e0ba PA |
2263 | /* Select one LWP out of those that have events pending. */ |
2264 | ||
2265 | static void | |
2266 | select_event_lwp (struct lwp_info **orig_lp) | |
2267 | { | |
2268 | int num_events = 0; | |
2269 | int random_selector; | |
d86d4aaf | 2270 | struct thread_info *event_thread; |
6bf5e0ba PA |
2271 | |
2272 | /* Give preference to any LWP that is being single-stepped. */ | |
d86d4aaf DE |
2273 | event_thread |
2274 | = (struct thread_info *) find_inferior (&all_threads, | |
2275 | select_singlestep_lwp_callback, | |
2276 | NULL); | |
2277 | if (event_thread != NULL) | |
6bf5e0ba PA |
2278 | { |
2279 | if (debug_threads) | |
87ce2a04 | 2280 | debug_printf ("SEL: Select single-step %s\n", |
d86d4aaf | 2281 | target_pid_to_str (ptid_of (event_thread))); |
6bf5e0ba PA |
2282 | } |
2283 | else | |
2284 | { | |
2285 | /* No single-stepping LWP. Select one at random, out of those | |
2286 | which have had SIGTRAP events. */ | |
2287 | ||
2288 | /* First see how many SIGTRAP events we have. */ | |
d86d4aaf | 2289 | find_inferior (&all_threads, count_events_callback, &num_events); |
6bf5e0ba PA |
2290 | |
2291 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2292 | random_selector = (int) | |
2293 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2294 | ||
2295 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2296 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2297 | num_events, random_selector); | |
6bf5e0ba | 2298 | |
d86d4aaf DE |
2299 | event_thread |
2300 | = (struct thread_info *) find_inferior (&all_threads, | |
2301 | select_event_lwp_callback, | |
2302 | &random_selector); | |
6bf5e0ba PA |
2303 | } |
2304 | ||
d86d4aaf | 2305 | if (event_thread != NULL) |
6bf5e0ba | 2306 | { |
d86d4aaf DE |
2307 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2308 | ||
6bf5e0ba PA |
2309 | /* Switch the event LWP. */ |
2310 | *orig_lp = event_lp; | |
2311 | } | |
2312 | } | |
2313 | ||
7984d532 PA |
2314 | /* Decrement the suspend count of an LWP. */ |
2315 | ||
2316 | static int | |
2317 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2318 | { | |
d86d4aaf DE |
2319 | struct thread_info *thread = (struct thread_info *) entry; |
2320 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
2321 | |
2322 | /* Ignore EXCEPT. */ | |
2323 | if (lwp == except) | |
2324 | return 0; | |
2325 | ||
2326 | lwp->suspended--; | |
2327 | ||
2328 | gdb_assert (lwp->suspended >= 0); | |
2329 | return 0; | |
2330 | } | |
2331 | ||
2332 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2333 | NULL. */ | |
2334 | ||
2335 | static void | |
2336 | unsuspend_all_lwps (struct lwp_info *except) | |
2337 | { | |
d86d4aaf | 2338 | find_inferior (&all_threads, unsuspend_one_lwp, except); |
7984d532 PA |
2339 | } |
2340 | ||
fa593d66 PA |
2341 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2342 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2343 | void *data); | |
2344 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2345 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2346 | struct target_waitstatus *ourstatus, | |
2347 | int target_options); | |
2348 | ||
2349 | /* Stabilize threads (move out of jump pads). | |
2350 | ||
2351 | If a thread is midway collecting a fast tracepoint, we need to | |
2352 | finish the collection and move it out of the jump pad before | |
2353 | reporting the signal. | |
2354 | ||
2355 | This avoids recursion while collecting (when a signal arrives | |
2356 | midway, and the signal handler itself collects), which would trash | |
2357 | the trace buffer. In case the user set a breakpoint in a signal | |
2358 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2359 | Most importantly, there are certain things we can't do safely if | |
2360 | threads are stopped in a jump pad (or in its callee's). For | |
2361 | example: | |
2362 | ||
2363 | - starting a new trace run. A thread still collecting the | |
2364 | previous run, could trash the trace buffer when resumed. The trace | |
2365 | buffer control structures would have been reset but the thread had | |
2366 | no way to tell. The thread could even midway memcpy'ing to the | |
2367 | buffer, which would mean that when resumed, it would clobber the | |
2368 | trace buffer that had been set for a new run. | |
2369 | ||
2370 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2371 | safely. Say you do tstart while a thread is stopped midway while | |
2372 | collecting. When the thread is later resumed, it finishes the | |
2373 | collection, and returns to the jump pad, to execute the original | |
2374 | instruction that was under the tracepoint jump at the time the | |
2375 | older run had been started. If the jump pad had been rewritten | |
2376 | since for something else in the new run, the thread would now | |
2377 | execute the wrong / random instructions. */ | |
2378 | ||
2379 | static void | |
2380 | linux_stabilize_threads (void) | |
2381 | { | |
2382 | struct thread_info *save_inferior; | |
d86d4aaf | 2383 | struct thread_info *thread_stuck; |
fa593d66 | 2384 | |
d86d4aaf DE |
2385 | thread_stuck |
2386 | = (struct thread_info *) find_inferior (&all_threads, | |
2387 | stuck_in_jump_pad_callback, | |
2388 | NULL); | |
2389 | if (thread_stuck != NULL) | |
fa593d66 | 2390 | { |
b4d51a55 | 2391 | if (debug_threads) |
87ce2a04 | 2392 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2393 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2394 | return; |
2395 | } | |
2396 | ||
2397 | save_inferior = current_inferior; | |
2398 | ||
2399 | stabilizing_threads = 1; | |
2400 | ||
2401 | /* Kick 'em all. */ | |
d86d4aaf | 2402 | for_each_inferior (&all_threads, move_out_of_jump_pad_callback); |
fa593d66 PA |
2403 | |
2404 | /* Loop until all are stopped out of the jump pads. */ | |
d86d4aaf | 2405 | while (find_inferior (&all_threads, lwp_running, NULL) != NULL) |
fa593d66 PA |
2406 | { |
2407 | struct target_waitstatus ourstatus; | |
2408 | struct lwp_info *lwp; | |
fa593d66 PA |
2409 | int wstat; |
2410 | ||
2411 | /* Note that we go through the full wait even loop. While | |
2412 | moving threads out of jump pad, we need to be able to step | |
2413 | over internal breakpoints and such. */ | |
32fcada3 | 2414 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2415 | |
2416 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2417 | { | |
2418 | lwp = get_thread_lwp (current_inferior); | |
2419 | ||
2420 | /* Lock it. */ | |
2421 | lwp->suspended++; | |
2422 | ||
a493e3e2 | 2423 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
fa593d66 PA |
2424 | || current_inferior->last_resume_kind == resume_stop) |
2425 | { | |
2ea28649 | 2426 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2427 | enqueue_one_deferred_signal (lwp, &wstat); |
2428 | } | |
2429 | } | |
2430 | } | |
2431 | ||
d86d4aaf | 2432 | find_inferior (&all_threads, unsuspend_one_lwp, NULL); |
fa593d66 PA |
2433 | |
2434 | stabilizing_threads = 0; | |
2435 | ||
2436 | current_inferior = save_inferior; | |
2437 | ||
b4d51a55 | 2438 | if (debug_threads) |
fa593d66 | 2439 | { |
d86d4aaf DE |
2440 | thread_stuck |
2441 | = (struct thread_info *) find_inferior (&all_threads, | |
2442 | stuck_in_jump_pad_callback, | |
2443 | NULL); | |
2444 | if (thread_stuck != NULL) | |
87ce2a04 | 2445 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2446 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2447 | } |
2448 | } | |
2449 | ||
0d62e5e8 | 2450 | /* Wait for process, returns status. */ |
da6d8c04 | 2451 | |
95954743 PA |
2452 | static ptid_t |
2453 | linux_wait_1 (ptid_t ptid, | |
2454 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2455 | { |
e5f1222d | 2456 | int w; |
fc7238bb | 2457 | struct lwp_info *event_child; |
bd99dc85 | 2458 | int options; |
bd99dc85 | 2459 | int pid; |
6bf5e0ba PA |
2460 | int step_over_finished; |
2461 | int bp_explains_trap; | |
2462 | int maybe_internal_trap; | |
2463 | int report_to_gdb; | |
219f2f23 | 2464 | int trace_event; |
c2d6af84 | 2465 | int in_step_range; |
bd99dc85 | 2466 | |
87ce2a04 DE |
2467 | if (debug_threads) |
2468 | { | |
2469 | debug_enter (); | |
2470 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
2471 | } | |
2472 | ||
bd99dc85 PA |
2473 | /* Translate generic target options into linux options. */ |
2474 | options = __WALL; | |
2475 | if (target_options & TARGET_WNOHANG) | |
2476 | options |= WNOHANG; | |
0d62e5e8 DJ |
2477 | |
2478 | retry: | |
fa593d66 PA |
2479 | bp_explains_trap = 0; |
2480 | trace_event = 0; | |
c2d6af84 | 2481 | in_step_range = 0; |
bd99dc85 PA |
2482 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2483 | ||
0d62e5e8 DJ |
2484 | /* If we were only supposed to resume one thread, only wait for |
2485 | that thread - if it's still alive. If it died, however - which | |
2486 | can happen if we're coming from the thread death case below - | |
2487 | then we need to make sure we restart the other threads. We could | |
2488 | pick a thread at random or restart all; restarting all is less | |
2489 | arbitrary. */ | |
95954743 PA |
2490 | if (!non_stop |
2491 | && !ptid_equal (cont_thread, null_ptid) | |
2492 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 2493 | { |
fc7238bb PA |
2494 | struct thread_info *thread; |
2495 | ||
bd99dc85 PA |
2496 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
2497 | cont_thread); | |
0d62e5e8 DJ |
2498 | |
2499 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 2500 | if (thread == NULL) |
64386c31 DJ |
2501 | { |
2502 | struct thread_resume resume_info; | |
95954743 | 2503 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
2504 | resume_info.kind = resume_continue; |
2505 | resume_info.sig = 0; | |
2bd7c093 | 2506 | linux_resume (&resume_info, 1); |
64386c31 | 2507 | } |
bd99dc85 | 2508 | else |
95954743 | 2509 | ptid = cont_thread; |
0d62e5e8 | 2510 | } |
da6d8c04 | 2511 | |
6bf5e0ba PA |
2512 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2513 | pid = linux_wait_for_event (ptid, &w, options); | |
2514 | else | |
2515 | { | |
2516 | if (debug_threads) | |
87ce2a04 DE |
2517 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
2518 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
2519 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
2520 | } | |
2521 | ||
fa96cb38 | 2522 | if (pid == 0) |
87ce2a04 | 2523 | { |
fa96cb38 PA |
2524 | gdb_assert (target_options & TARGET_WNOHANG); |
2525 | ||
87ce2a04 DE |
2526 | if (debug_threads) |
2527 | { | |
fa96cb38 PA |
2528 | debug_printf ("linux_wait_1 ret = null_ptid, " |
2529 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
2530 | debug_exit (); |
2531 | } | |
fa96cb38 PA |
2532 | |
2533 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
2534 | return null_ptid; |
2535 | } | |
fa96cb38 PA |
2536 | else if (pid == -1) |
2537 | { | |
2538 | if (debug_threads) | |
2539 | { | |
2540 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
2541 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
2542 | debug_exit (); | |
2543 | } | |
bd99dc85 | 2544 | |
fa96cb38 PA |
2545 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
2546 | return null_ptid; | |
2547 | } | |
0d62e5e8 | 2548 | |
fa96cb38 | 2549 | event_child = get_thread_lwp (current_inferior); |
0d62e5e8 | 2550 | |
fa96cb38 PA |
2551 | /* linux_wait_for_event only returns an exit status for the last |
2552 | child of a process. Report it. */ | |
2553 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 2554 | { |
fa96cb38 | 2555 | if (WIFEXITED (w)) |
0d62e5e8 | 2556 | { |
fa96cb38 PA |
2557 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
2558 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 2559 | |
fa96cb38 | 2560 | if (debug_threads) |
bd99dc85 | 2561 | { |
fa96cb38 PA |
2562 | debug_printf ("linux_wait_1 ret = %s, exited with " |
2563 | "retcode %d\n", | |
2564 | target_pid_to_str (ptid_of (current_inferior)), | |
2565 | WEXITSTATUS (w)); | |
2566 | debug_exit (); | |
bd99dc85 | 2567 | } |
fa96cb38 PA |
2568 | } |
2569 | else | |
2570 | { | |
2571 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2572 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 2573 | |
fa96cb38 PA |
2574 | if (debug_threads) |
2575 | { | |
2576 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
2577 | "signal %d\n", | |
2578 | target_pid_to_str (ptid_of (current_inferior)), | |
2579 | WTERMSIG (w)); | |
2580 | debug_exit (); | |
2581 | } | |
0d62e5e8 | 2582 | } |
fa96cb38 PA |
2583 | |
2584 | return ptid_of (current_inferior); | |
da6d8c04 DJ |
2585 | } |
2586 | ||
6bf5e0ba PA |
2587 | /* If this event was not handled before, and is not a SIGTRAP, we |
2588 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2589 | a breakpoint is inserted at the current PC. If this target does | |
2590 | not support internal breakpoints at all, we also report the | |
2591 | SIGTRAP without further processing; it's of no concern to us. */ | |
2592 | maybe_internal_trap | |
2593 | = (supports_breakpoints () | |
2594 | && (WSTOPSIG (w) == SIGTRAP | |
2595 | || ((WSTOPSIG (w) == SIGILL | |
2596 | || WSTOPSIG (w) == SIGSEGV) | |
2597 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2598 | ||
2599 | if (maybe_internal_trap) | |
2600 | { | |
2601 | /* Handle anything that requires bookkeeping before deciding to | |
2602 | report the event or continue waiting. */ | |
2603 | ||
2604 | /* First check if we can explain the SIGTRAP with an internal | |
2605 | breakpoint, or if we should possibly report the event to GDB. | |
2606 | Do this before anything that may remove or insert a | |
2607 | breakpoint. */ | |
2608 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2609 | ||
2610 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2611 | finished. If so, tweak the state machine accordingly, | |
2612 | reinsert breakpoints and delete any reinsert (software | |
2613 | single-step) breakpoints. */ | |
2614 | step_over_finished = finish_step_over (event_child); | |
2615 | ||
2616 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2617 | check_breakpoints (event_child->stop_pc); | |
2618 | ||
219f2f23 PA |
2619 | /* Handle tracepoint data collecting. This may overflow the |
2620 | trace buffer, and cause a tracing stop, removing | |
2621 | breakpoints. */ | |
2622 | trace_event = handle_tracepoints (event_child); | |
2623 | ||
6bf5e0ba PA |
2624 | if (bp_explains_trap) |
2625 | { | |
2626 | /* If we stepped or ran into an internal breakpoint, we've | |
2627 | already handled it. So next time we resume (from this | |
2628 | PC), we should step over it. */ | |
2629 | if (debug_threads) | |
87ce2a04 | 2630 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2631 | |
8b07ae33 PA |
2632 | if (breakpoint_here (event_child->stop_pc)) |
2633 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2634 | } |
2635 | } | |
2636 | else | |
2637 | { | |
2638 | /* We have some other signal, possibly a step-over dance was in | |
2639 | progress, and it should be cancelled too. */ | |
2640 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2641 | } |
2642 | ||
2643 | /* We have all the data we need. Either report the event to GDB, or | |
2644 | resume threads and keep waiting for more. */ | |
2645 | ||
2646 | /* If we're collecting a fast tracepoint, finish the collection and | |
2647 | move out of the jump pad before delivering a signal. See | |
2648 | linux_stabilize_threads. */ | |
2649 | ||
2650 | if (WIFSTOPPED (w) | |
2651 | && WSTOPSIG (w) != SIGTRAP | |
2652 | && supports_fast_tracepoints () | |
58b4daa5 | 2653 | && agent_loaded_p ()) |
fa593d66 PA |
2654 | { |
2655 | if (debug_threads) | |
87ce2a04 DE |
2656 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
2657 | "to defer or adjust it.\n", | |
d86d4aaf | 2658 | WSTOPSIG (w), lwpid_of (current_inferior)); |
fa593d66 PA |
2659 | |
2660 | /* Allow debugging the jump pad itself. */ | |
2661 | if (current_inferior->last_resume_kind != resume_step | |
2662 | && maybe_move_out_of_jump_pad (event_child, &w)) | |
2663 | { | |
2664 | enqueue_one_deferred_signal (event_child, &w); | |
2665 | ||
2666 | if (debug_threads) | |
87ce2a04 | 2667 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
d86d4aaf | 2668 | WSTOPSIG (w), lwpid_of (current_inferior)); |
fa593d66 PA |
2669 | |
2670 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
2671 | goto retry; | |
2672 | } | |
2673 | } | |
219f2f23 | 2674 | |
fa593d66 PA |
2675 | if (event_child->collecting_fast_tracepoint) |
2676 | { | |
2677 | if (debug_threads) | |
87ce2a04 DE |
2678 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
2679 | "Check if we're already there.\n", | |
d86d4aaf | 2680 | lwpid_of (current_inferior), |
87ce2a04 | 2681 | event_child->collecting_fast_tracepoint); |
fa593d66 PA |
2682 | |
2683 | trace_event = 1; | |
2684 | ||
2685 | event_child->collecting_fast_tracepoint | |
2686 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2687 | ||
2688 | if (event_child->collecting_fast_tracepoint != 1) | |
2689 | { | |
2690 | /* No longer need this breakpoint. */ | |
2691 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2692 | { | |
2693 | if (debug_threads) | |
87ce2a04 DE |
2694 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
2695 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2696 | |
2697 | /* Other running threads could hit this breakpoint. | |
2698 | We don't handle moribund locations like GDB does, | |
2699 | instead we always pause all threads when removing | |
2700 | breakpoints, so that any step-over or | |
2701 | decr_pc_after_break adjustment is always taken | |
2702 | care of while the breakpoint is still | |
2703 | inserted. */ | |
2704 | stop_all_lwps (1, event_child); | |
2705 | cancel_breakpoints (); | |
2706 | ||
2707 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2708 | event_child->exit_jump_pad_bkpt = NULL; | |
2709 | ||
2710 | unstop_all_lwps (1, event_child); | |
2711 | ||
2712 | gdb_assert (event_child->suspended >= 0); | |
2713 | } | |
2714 | } | |
2715 | ||
2716 | if (event_child->collecting_fast_tracepoint == 0) | |
2717 | { | |
2718 | if (debug_threads) | |
87ce2a04 DE |
2719 | debug_printf ("fast tracepoint finished " |
2720 | "collecting successfully.\n"); | |
fa593d66 PA |
2721 | |
2722 | /* We may have a deferred signal to report. */ | |
2723 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2724 | { | |
2725 | if (debug_threads) | |
87ce2a04 | 2726 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 2727 | } |
3c11dd79 | 2728 | else |
fa593d66 | 2729 | { |
3c11dd79 | 2730 | if (debug_threads) |
87ce2a04 | 2731 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
2732 | |
2733 | if (stabilizing_threads) | |
2734 | { | |
2735 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 2736 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
2737 | |
2738 | if (debug_threads) | |
2739 | { | |
2740 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
2741 | "while stabilizing threads\n", | |
d86d4aaf | 2742 | target_pid_to_str (ptid_of (current_inferior))); |
87ce2a04 DE |
2743 | debug_exit (); |
2744 | } | |
2745 | ||
d86d4aaf | 2746 | return ptid_of (current_inferior); |
fa593d66 PA |
2747 | } |
2748 | } | |
2749 | } | |
6bf5e0ba PA |
2750 | } |
2751 | ||
e471f25b PA |
2752 | /* Check whether GDB would be interested in this event. */ |
2753 | ||
2754 | /* If GDB is not interested in this signal, don't stop other | |
2755 | threads, and don't report it to GDB. Just resume the inferior | |
2756 | right away. We do this for threading-related signals as well as | |
2757 | any that GDB specifically requested we ignore. But never ignore | |
2758 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2759 | stepping - they may require special handling to skip the signal | |
2760 | handler. */ | |
2761 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2762 | thread library? */ | |
2763 | if (WIFSTOPPED (w) | |
2764 | && current_inferior->last_resume_kind != resume_step | |
2765 | && ( | |
1a981360 | 2766 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2767 | (current_process ()->private->thread_db != NULL |
2768 | && (WSTOPSIG (w) == __SIGRTMIN | |
2769 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2770 | || | |
2771 | #endif | |
2ea28649 | 2772 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b PA |
2773 | && !(WSTOPSIG (w) == SIGSTOP |
2774 | && current_inferior->last_resume_kind == resume_stop)))) | |
2775 | { | |
2776 | siginfo_t info, *info_p; | |
2777 | ||
2778 | if (debug_threads) | |
87ce2a04 | 2779 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
d86d4aaf | 2780 | WSTOPSIG (w), lwpid_of (current_inferior)); |
e471f25b | 2781 | |
d86d4aaf | 2782 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_inferior), |
b8e1b30e | 2783 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
2784 | info_p = &info; |
2785 | else | |
2786 | info_p = NULL; | |
2787 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2788 | WSTOPSIG (w), info_p); | |
2789 | goto retry; | |
2790 | } | |
2791 | ||
c2d6af84 PA |
2792 | /* Note that all addresses are always "out of the step range" when |
2793 | there's no range to begin with. */ | |
2794 | in_step_range = lwp_in_step_range (event_child); | |
2795 | ||
2796 | /* If GDB wanted this thread to single step, and the thread is out | |
2797 | of the step range, we always want to report the SIGTRAP, and let | |
2798 | GDB handle it. Watchpoints should always be reported. So should | |
2799 | signals we can't explain. A SIGTRAP we can't explain could be a | |
2800 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
2801 | do, we're be able to handle GDB breakpoints on top of internal | |
2802 | breakpoints, by handling the internal breakpoint and still | |
2803 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
2804 | won't see the breakpoint hit. */ | |
6bf5e0ba | 2805 | report_to_gdb = (!maybe_internal_trap |
c2d6af84 PA |
2806 | || (current_inferior->last_resume_kind == resume_step |
2807 | && !in_step_range) | |
6bf5e0ba | 2808 | || event_child->stopped_by_watchpoint |
c2d6af84 | 2809 | || (!step_over_finished && !in_step_range |
493e2a69 | 2810 | && !bp_explains_trap && !trace_event) |
9f3a5c85 | 2811 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 SS |
2812 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
2813 | && gdb_no_commands_at_breakpoint (event_child->stop_pc))); | |
2814 | ||
2815 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
2816 | |
2817 | /* We found no reason GDB would want us to stop. We either hit one | |
2818 | of our own breakpoints, or finished an internal step GDB | |
2819 | shouldn't know about. */ | |
2820 | if (!report_to_gdb) | |
2821 | { | |
2822 | if (debug_threads) | |
2823 | { | |
2824 | if (bp_explains_trap) | |
87ce2a04 | 2825 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2826 | if (step_over_finished) |
87ce2a04 | 2827 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 2828 | if (trace_event) |
87ce2a04 | 2829 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 2830 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
2831 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
2832 | paddress (event_child->stop_pc), | |
2833 | paddress (event_child->step_range_start), | |
2834 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
2835 | } |
2836 | ||
2837 | /* We're not reporting this breakpoint to GDB, so apply the | |
2838 | decr_pc_after_break adjustment to the inferior's regcache | |
2839 | ourselves. */ | |
2840 | ||
2841 | if (the_low_target.set_pc != NULL) | |
2842 | { | |
2843 | struct regcache *regcache | |
d86d4aaf | 2844 | = get_thread_regcache (current_inferior, 1); |
6bf5e0ba PA |
2845 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
2846 | } | |
2847 | ||
7984d532 PA |
2848 | /* We may have finished stepping over a breakpoint. If so, |
2849 | we've stopped and suspended all LWPs momentarily except the | |
2850 | stepping one. This is where we resume them all again. We're | |
2851 | going to keep waiting, so use proceed, which handles stepping | |
2852 | over the next breakpoint. */ | |
6bf5e0ba | 2853 | if (debug_threads) |
87ce2a04 | 2854 | debug_printf ("proceeding all threads.\n"); |
7984d532 PA |
2855 | |
2856 | if (step_over_finished) | |
2857 | unsuspend_all_lwps (event_child); | |
2858 | ||
6bf5e0ba PA |
2859 | proceed_all_lwps (); |
2860 | goto retry; | |
2861 | } | |
2862 | ||
2863 | if (debug_threads) | |
2864 | { | |
8336d594 | 2865 | if (current_inferior->last_resume_kind == resume_step) |
c2d6af84 PA |
2866 | { |
2867 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 2868 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 2869 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 2870 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 2871 | } |
6bf5e0ba | 2872 | if (event_child->stopped_by_watchpoint) |
87ce2a04 | 2873 | debug_printf ("Stopped by watchpoint.\n"); |
8b07ae33 | 2874 | if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 2875 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 2876 | if (debug_threads) |
87ce2a04 | 2877 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
2878 | } |
2879 | ||
2880 | /* Alright, we're going to report a stop. */ | |
2881 | ||
fa593d66 | 2882 | if (!non_stop && !stabilizing_threads) |
6bf5e0ba PA |
2883 | { |
2884 | /* In all-stop, stop all threads. */ | |
7984d532 | 2885 | stop_all_lwps (0, NULL); |
6bf5e0ba PA |
2886 | |
2887 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2888 | from among those that have had events. Giving equal priority | |
2889 | to all LWPs that have had events helps prevent | |
2890 | starvation. */ | |
2891 | if (ptid_equal (ptid, minus_one_ptid)) | |
2892 | { | |
2893 | event_child->status_pending_p = 1; | |
2894 | event_child->status_pending = w; | |
2895 | ||
2896 | select_event_lwp (&event_child); | |
2897 | ||
ee1e2d4f DE |
2898 | /* current_inferior and event_child must stay in sync. */ |
2899 | current_inferior = get_lwp_thread (event_child); | |
2900 | ||
6bf5e0ba PA |
2901 | event_child->status_pending_p = 0; |
2902 | w = event_child->status_pending; | |
2903 | } | |
2904 | ||
2905 | /* Now that we've selected our final event LWP, cancel any | |
2906 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
2907 | See the comment in cancel_breakpoints_callback to find out | |
2908 | why. */ | |
d86d4aaf | 2909 | find_inferior (&all_threads, cancel_breakpoints_callback, event_child); |
fa593d66 | 2910 | |
c03e6ccc YQ |
2911 | /* If we were going a step-over, all other threads but the stepping one |
2912 | had been paused in start_step_over, with their suspend counts | |
2913 | incremented. We don't want to do a full unstop/unpause, because we're | |
2914 | in all-stop mode (so we want threads stopped), but we still need to | |
2915 | unsuspend the other threads, to decrement their `suspended' count | |
2916 | back. */ | |
2917 | if (step_over_finished) | |
2918 | unsuspend_all_lwps (event_child); | |
2919 | ||
fa593d66 PA |
2920 | /* Stabilize threads (move out of jump pads). */ |
2921 | stabilize_threads (); | |
6bf5e0ba PA |
2922 | } |
2923 | else | |
2924 | { | |
2925 | /* If we just finished a step-over, then all threads had been | |
2926 | momentarily paused. In all-stop, that's fine, we want | |
2927 | threads stopped by now anyway. In non-stop, we need to | |
2928 | re-resume threads that GDB wanted to be running. */ | |
2929 | if (step_over_finished) | |
7984d532 | 2930 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2931 | } |
2932 | ||
5b1c542e | 2933 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2934 | |
8336d594 PA |
2935 | if (current_inferior->last_resume_kind == resume_stop |
2936 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
2937 | { |
2938 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2939 | and it stopped cleanly, so report as SIG0. The use of | |
2940 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 2941 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 2942 | } |
8336d594 PA |
2943 | else if (current_inferior->last_resume_kind == resume_stop |
2944 | && WSTOPSIG (w) != SIGSTOP) | |
bd99dc85 PA |
2945 | { |
2946 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2947 | but, it stopped for other reasons. */ |
2ea28649 | 2948 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2949 | } |
2950 | else | |
2951 | { | |
2ea28649 | 2952 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2953 | } |
2954 | ||
d50171e4 PA |
2955 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2956 | ||
bd99dc85 | 2957 | if (debug_threads) |
87ce2a04 DE |
2958 | { |
2959 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
d86d4aaf | 2960 | target_pid_to_str (ptid_of (current_inferior)), |
87ce2a04 DE |
2961 | ourstatus->kind, ourstatus->value.sig); |
2962 | debug_exit (); | |
2963 | } | |
bd99dc85 | 2964 | |
d86d4aaf | 2965 | return ptid_of (current_inferior); |
bd99dc85 PA |
2966 | } |
2967 | ||
2968 | /* Get rid of any pending event in the pipe. */ | |
2969 | static void | |
2970 | async_file_flush (void) | |
2971 | { | |
2972 | int ret; | |
2973 | char buf; | |
2974 | ||
2975 | do | |
2976 | ret = read (linux_event_pipe[0], &buf, 1); | |
2977 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2978 | } | |
2979 | ||
2980 | /* Put something in the pipe, so the event loop wakes up. */ | |
2981 | static void | |
2982 | async_file_mark (void) | |
2983 | { | |
2984 | int ret; | |
2985 | ||
2986 | async_file_flush (); | |
2987 | ||
2988 | do | |
2989 | ret = write (linux_event_pipe[1], "+", 1); | |
2990 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2991 | ||
2992 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
2993 | be awakened anyway. */ | |
2994 | } | |
2995 | ||
95954743 PA |
2996 | static ptid_t |
2997 | linux_wait (ptid_t ptid, | |
2998 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 2999 | { |
95954743 | 3000 | ptid_t event_ptid; |
bd99dc85 | 3001 | |
bd99dc85 PA |
3002 | /* Flush the async file first. */ |
3003 | if (target_is_async_p ()) | |
3004 | async_file_flush (); | |
3005 | ||
95954743 | 3006 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
3007 | |
3008 | /* If at least one stop was reported, there may be more. A single | |
3009 | SIGCHLD can signal more than one child stop. */ | |
3010 | if (target_is_async_p () | |
3011 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 3012 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
3013 | async_file_mark (); |
3014 | ||
3015 | return event_ptid; | |
da6d8c04 DJ |
3016 | } |
3017 | ||
c5f62d5f | 3018 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3019 | |
3020 | static int | |
a1928bad | 3021 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3022 | { |
c5f62d5f DE |
3023 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
3024 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 3025 | |
c5f62d5f DE |
3026 | #ifdef __NR_tkill |
3027 | { | |
3028 | static int tkill_failed; | |
fd500816 | 3029 | |
c5f62d5f DE |
3030 | if (!tkill_failed) |
3031 | { | |
3032 | int ret; | |
3033 | ||
3034 | errno = 0; | |
3035 | ret = syscall (__NR_tkill, lwpid, signo); | |
3036 | if (errno != ENOSYS) | |
3037 | return ret; | |
3038 | tkill_failed = 1; | |
3039 | } | |
3040 | } | |
fd500816 DJ |
3041 | #endif |
3042 | ||
3043 | return kill (lwpid, signo); | |
3044 | } | |
3045 | ||
964e4306 PA |
3046 | void |
3047 | linux_stop_lwp (struct lwp_info *lwp) | |
3048 | { | |
3049 | send_sigstop (lwp); | |
3050 | } | |
3051 | ||
0d62e5e8 | 3052 | static void |
02fc4de7 | 3053 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3054 | { |
bd99dc85 | 3055 | int pid; |
0d62e5e8 | 3056 | |
d86d4aaf | 3057 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3058 | |
0d62e5e8 DJ |
3059 | /* If we already have a pending stop signal for this process, don't |
3060 | send another. */ | |
54a0b537 | 3061 | if (lwp->stop_expected) |
0d62e5e8 | 3062 | { |
ae13219e | 3063 | if (debug_threads) |
87ce2a04 | 3064 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3065 | |
0d62e5e8 DJ |
3066 | return; |
3067 | } | |
3068 | ||
3069 | if (debug_threads) | |
87ce2a04 | 3070 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3071 | |
d50171e4 | 3072 | lwp->stop_expected = 1; |
bd99dc85 | 3073 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3074 | } |
3075 | ||
7984d532 PA |
3076 | static int |
3077 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 | 3078 | { |
d86d4aaf DE |
3079 | struct thread_info *thread = (struct thread_info *) entry; |
3080 | struct lwp_info *lwp = get_thread_lwp (thread); | |
02fc4de7 | 3081 | |
7984d532 PA |
3082 | /* Ignore EXCEPT. */ |
3083 | if (lwp == except) | |
3084 | return 0; | |
3085 | ||
02fc4de7 | 3086 | if (lwp->stopped) |
7984d532 | 3087 | return 0; |
02fc4de7 PA |
3088 | |
3089 | send_sigstop (lwp); | |
7984d532 PA |
3090 | return 0; |
3091 | } | |
3092 | ||
3093 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3094 | yet. */ | |
3095 | static int | |
3096 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
3097 | void *except) | |
3098 | { | |
d86d4aaf DE |
3099 | struct thread_info *thread = (struct thread_info *) entry; |
3100 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
3101 | |
3102 | /* Ignore EXCEPT. */ | |
3103 | if (lwp == except) | |
3104 | return 0; | |
3105 | ||
3106 | lwp->suspended++; | |
3107 | ||
3108 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
3109 | } |
3110 | ||
95954743 PA |
3111 | static void |
3112 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3113 | { | |
3114 | /* It's dead, really. */ | |
3115 | lwp->dead = 1; | |
3116 | ||
3117 | /* Store the exit status for later. */ | |
3118 | lwp->status_pending_p = 1; | |
3119 | lwp->status_pending = wstat; | |
3120 | ||
95954743 PA |
3121 | /* Prevent trying to stop it. */ |
3122 | lwp->stopped = 1; | |
3123 | ||
3124 | /* No further stops are expected from a dead lwp. */ | |
3125 | lwp->stop_expected = 0; | |
3126 | } | |
3127 | ||
fa96cb38 PA |
3128 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
3129 | ||
0d62e5e8 | 3130 | static void |
fa96cb38 | 3131 | wait_for_sigstop (void) |
0d62e5e8 | 3132 | { |
bd99dc85 | 3133 | struct thread_info *saved_inferior; |
95954743 | 3134 | ptid_t saved_tid; |
fa96cb38 PA |
3135 | int wstat; |
3136 | int ret; | |
0d62e5e8 DJ |
3137 | |
3138 | saved_inferior = current_inferior; | |
bd99dc85 | 3139 | if (saved_inferior != NULL) |
80894984 | 3140 | saved_tid = saved_inferior->entry.id; |
bd99dc85 | 3141 | else |
95954743 | 3142 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3143 | |
d50171e4 | 3144 | if (debug_threads) |
fa96cb38 | 3145 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3146 | |
fa96cb38 PA |
3147 | /* Passing NULL_PTID as filter indicates we want all events to be |
3148 | left pending. Eventually this returns when there are no | |
3149 | unwaited-for children left. */ | |
3150 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
3151 | &wstat, __WALL); | |
3152 | gdb_assert (ret == -1); | |
0d62e5e8 | 3153 | |
bd99dc85 | 3154 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
3155 | current_inferior = saved_inferior; |
3156 | else | |
3157 | { | |
3158 | if (debug_threads) | |
87ce2a04 | 3159 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3160 | |
bd99dc85 PA |
3161 | if (non_stop) |
3162 | { | |
3163 | /* We can't change the current inferior behind GDB's back, | |
3164 | otherwise, a subsequent command may apply to the wrong | |
3165 | process. */ | |
3166 | current_inferior = NULL; | |
3167 | } | |
3168 | else | |
3169 | { | |
3170 | /* Set a valid thread as current. */ | |
3171 | set_desired_inferior (0); | |
3172 | } | |
0d62e5e8 DJ |
3173 | } |
3174 | } | |
3175 | ||
fa593d66 PA |
3176 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3177 | move it out, because we need to report the stop event to GDB. For | |
3178 | example, if the user puts a breakpoint in the jump pad, it's | |
3179 | because she wants to debug it. */ | |
3180 | ||
3181 | static int | |
3182 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3183 | { | |
d86d4aaf DE |
3184 | struct thread_info *thread = (struct thread_info *) entry; |
3185 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3186 | |
3187 | gdb_assert (lwp->suspended == 0); | |
3188 | gdb_assert (lwp->stopped); | |
3189 | ||
3190 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3191 | return (supports_fast_tracepoints () | |
58b4daa5 | 3192 | && agent_loaded_p () |
fa593d66 PA |
3193 | && (gdb_breakpoint_here (lwp->stop_pc) |
3194 | || lwp->stopped_by_watchpoint | |
3195 | || thread->last_resume_kind == resume_step) | |
3196 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3197 | } | |
3198 | ||
3199 | static void | |
3200 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3201 | { | |
d86d4aaf DE |
3202 | struct thread_info *thread = (struct thread_info *) entry; |
3203 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3204 | int *wstat; |
3205 | ||
3206 | gdb_assert (lwp->suspended == 0); | |
3207 | gdb_assert (lwp->stopped); | |
3208 | ||
3209 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3210 | ||
3211 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3212 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
3213 | && !lwp->stopped_by_watchpoint | |
3214 | && thread->last_resume_kind != resume_step | |
3215 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3216 | { | |
3217 | if (debug_threads) | |
87ce2a04 | 3218 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3219 | lwpid_of (thread)); |
fa593d66 PA |
3220 | |
3221 | if (wstat) | |
3222 | { | |
3223 | lwp->status_pending_p = 0; | |
3224 | enqueue_one_deferred_signal (lwp, wstat); | |
3225 | ||
3226 | if (debug_threads) | |
87ce2a04 DE |
3227 | debug_printf ("Signal %d for LWP %ld deferred " |
3228 | "(in jump pad)\n", | |
d86d4aaf | 3229 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
3230 | } |
3231 | ||
3232 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3233 | } | |
3234 | else | |
3235 | lwp->suspended++; | |
3236 | } | |
3237 | ||
3238 | static int | |
3239 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3240 | { | |
d86d4aaf DE |
3241 | struct thread_info *thread = (struct thread_info *) entry; |
3242 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3243 | |
3244 | if (lwp->dead) | |
3245 | return 0; | |
3246 | if (lwp->stopped) | |
3247 | return 0; | |
3248 | return 1; | |
3249 | } | |
3250 | ||
7984d532 PA |
3251 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3252 | If SUSPEND, then also increase the suspend count of every LWP, | |
3253 | except EXCEPT. */ | |
3254 | ||
0d62e5e8 | 3255 | static void |
7984d532 | 3256 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3257 | { |
bde24c0a PA |
3258 | /* Should not be called recursively. */ |
3259 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3260 | ||
87ce2a04 DE |
3261 | if (debug_threads) |
3262 | { | |
3263 | debug_enter (); | |
3264 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
3265 | suspend ? "stop-and-suspend" : "stop", | |
3266 | except != NULL | |
d86d4aaf | 3267 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
3268 | : "none"); |
3269 | } | |
3270 | ||
bde24c0a PA |
3271 | stopping_threads = (suspend |
3272 | ? STOPPING_AND_SUSPENDING_THREADS | |
3273 | : STOPPING_THREADS); | |
7984d532 PA |
3274 | |
3275 | if (suspend) | |
d86d4aaf | 3276 | find_inferior (&all_threads, suspend_and_send_sigstop_callback, except); |
7984d532 | 3277 | else |
d86d4aaf | 3278 | find_inferior (&all_threads, send_sigstop_callback, except); |
fa96cb38 | 3279 | wait_for_sigstop (); |
bde24c0a | 3280 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
3281 | |
3282 | if (debug_threads) | |
3283 | { | |
3284 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
3285 | "back to !stopping\n"); | |
3286 | debug_exit (); | |
3287 | } | |
0d62e5e8 DJ |
3288 | } |
3289 | ||
da6d8c04 DJ |
3290 | /* Resume execution of the inferior process. |
3291 | If STEP is nonzero, single-step it. | |
3292 | If SIGNAL is nonzero, give it that signal. */ | |
3293 | ||
ce3a066d | 3294 | static void |
2acc282a | 3295 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 3296 | int step, int signal, siginfo_t *info) |
da6d8c04 | 3297 | { |
d86d4aaf | 3298 | struct thread_info *thread = get_lwp_thread (lwp); |
0d62e5e8 | 3299 | struct thread_info *saved_inferior; |
fa593d66 | 3300 | int fast_tp_collecting; |
0d62e5e8 | 3301 | |
54a0b537 | 3302 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3303 | return; |
3304 | ||
fa593d66 PA |
3305 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3306 | ||
3307 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3308 | ||
219f2f23 PA |
3309 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3310 | user used the "jump" command, or "set $pc = foo"). */ | |
3311 | if (lwp->stop_pc != get_pc (lwp)) | |
3312 | { | |
3313 | /* Collecting 'while-stepping' actions doesn't make sense | |
3314 | anymore. */ | |
d86d4aaf | 3315 | release_while_stepping_state_list (thread); |
219f2f23 PA |
3316 | } |
3317 | ||
0d62e5e8 DJ |
3318 | /* If we have pending signals or status, and a new signal, enqueue the |
3319 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3320 | breakpoint; it will be picked up again below. */ | |
3321 | if (signal != 0 | |
fa593d66 PA |
3322 | && (lwp->status_pending_p |
3323 | || lwp->pending_signals != NULL | |
3324 | || lwp->bp_reinsert != 0 | |
3325 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3326 | { |
3327 | struct pending_signals *p_sig; | |
bca929d3 | 3328 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3329 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3330 | p_sig->signal = signal; |
32ca6d61 DJ |
3331 | if (info == NULL) |
3332 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3333 | else | |
3334 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3335 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3336 | } |
3337 | ||
d50171e4 PA |
3338 | if (lwp->status_pending_p) |
3339 | { | |
3340 | if (debug_threads) | |
87ce2a04 DE |
3341 | debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);" |
3342 | " has pending status\n", | |
d86d4aaf | 3343 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3344 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
3345 | return; |
3346 | } | |
0d62e5e8 DJ |
3347 | |
3348 | saved_inferior = current_inferior; | |
d86d4aaf | 3349 | current_inferior = thread; |
0d62e5e8 DJ |
3350 | |
3351 | if (debug_threads) | |
87ce2a04 | 3352 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", |
d86d4aaf | 3353 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3354 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3355 | |
3356 | /* This bit needs some thinking about. If we get a signal that | |
3357 | we must report while a single-step reinsert is still pending, | |
3358 | we often end up resuming the thread. It might be better to | |
3359 | (ew) allow a stack of pending events; then we could be sure that | |
3360 | the reinsert happened right away and not lose any signals. | |
3361 | ||
3362 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3363 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3364 | complete correctness, so it won't solve that problem. It may be |
3365 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3366 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3367 | { |
3368 | if (debug_threads) | |
87ce2a04 DE |
3369 | debug_printf (" pending reinsert at 0x%s\n", |
3370 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 3371 | |
85e00e85 | 3372 | if (can_hardware_single_step ()) |
d50171e4 | 3373 | { |
fa593d66 PA |
3374 | if (fast_tp_collecting == 0) |
3375 | { | |
3376 | if (step == 0) | |
3377 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3378 | if (lwp->suspended) | |
3379 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3380 | lwp->suspended); | |
3381 | } | |
d50171e4 PA |
3382 | |
3383 | step = 1; | |
3384 | } | |
0d62e5e8 DJ |
3385 | |
3386 | /* Postpone any pending signal. It was enqueued above. */ | |
3387 | signal = 0; | |
3388 | } | |
3389 | ||
fa593d66 PA |
3390 | if (fast_tp_collecting == 1) |
3391 | { | |
3392 | if (debug_threads) | |
87ce2a04 DE |
3393 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3394 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 3395 | lwpid_of (thread)); |
fa593d66 PA |
3396 | |
3397 | /* Postpone any pending signal. It was enqueued above. */ | |
3398 | signal = 0; | |
3399 | } | |
3400 | else if (fast_tp_collecting == 2) | |
3401 | { | |
3402 | if (debug_threads) | |
87ce2a04 DE |
3403 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3404 | " single-stepping\n", | |
d86d4aaf | 3405 | lwpid_of (thread)); |
fa593d66 PA |
3406 | |
3407 | if (can_hardware_single_step ()) | |
3408 | step = 1; | |
3409 | else | |
3410 | fatal ("moving out of jump pad single-stepping" | |
3411 | " not implemented on this target"); | |
3412 | ||
3413 | /* Postpone any pending signal. It was enqueued above. */ | |
3414 | signal = 0; | |
3415 | } | |
3416 | ||
219f2f23 PA |
3417 | /* If we have while-stepping actions in this thread set it stepping. |
3418 | If we have a signal to deliver, it may or may not be set to | |
3419 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3420 | while-stepping into a signal handler. A possible smart thing to | |
3421 | do would be to set an internal breakpoint at the signal return | |
3422 | address, continue, and carry on catching this while-stepping | |
3423 | action only when that breakpoint is hit. A future | |
3424 | enhancement. */ | |
d86d4aaf | 3425 | if (thread->while_stepping != NULL |
219f2f23 PA |
3426 | && can_hardware_single_step ()) |
3427 | { | |
3428 | if (debug_threads) | |
87ce2a04 | 3429 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 3430 | lwpid_of (thread)); |
219f2f23 PA |
3431 | step = 1; |
3432 | } | |
3433 | ||
aa691b87 | 3434 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 3435 | { |
442ea881 PA |
3436 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
3437 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
87ce2a04 | 3438 | debug_printf (" resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
3439 | } |
3440 | ||
fa593d66 PA |
3441 | /* If we have pending signals, consume one unless we are trying to |
3442 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3443 | collect. */ | |
3444 | if (lwp->pending_signals != NULL | |
3445 | && lwp->bp_reinsert == 0 | |
3446 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3447 | { |
3448 | struct pending_signals **p_sig; | |
3449 | ||
54a0b537 | 3450 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3451 | while ((*p_sig)->prev != NULL) |
3452 | p_sig = &(*p_sig)->prev; | |
3453 | ||
3454 | signal = (*p_sig)->signal; | |
32ca6d61 | 3455 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 3456 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3457 | &(*p_sig)->info); |
32ca6d61 | 3458 | |
0d62e5e8 DJ |
3459 | free (*p_sig); |
3460 | *p_sig = NULL; | |
3461 | } | |
3462 | ||
aa5ca48f DE |
3463 | if (the_low_target.prepare_to_resume != NULL) |
3464 | the_low_target.prepare_to_resume (lwp); | |
3465 | ||
d86d4aaf | 3466 | regcache_invalidate_thread (thread); |
da6d8c04 | 3467 | errno = 0; |
54a0b537 | 3468 | lwp->stopped = 0; |
c3adc08c | 3469 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 3470 | lwp->stepping = step; |
d86d4aaf | 3471 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (thread), |
b8e1b30e | 3472 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
3473 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3474 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 3475 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 DJ |
3476 | |
3477 | current_inferior = saved_inferior; | |
da6d8c04 | 3478 | if (errno) |
3221518c UW |
3479 | { |
3480 | /* ESRCH from ptrace either means that the thread was already | |
3481 | running (an error) or that it is gone (a race condition). If | |
3482 | it's gone, we will get a notification the next time we wait, | |
3483 | so we can ignore the error. We could differentiate these | |
3484 | two, but it's tricky without waiting; the thread still exists | |
3485 | as a zombie, so sending it signal 0 would succeed. So just | |
3486 | ignore ESRCH. */ | |
3487 | if (errno == ESRCH) | |
3488 | return; | |
3489 | ||
3490 | perror_with_name ("ptrace"); | |
3491 | } | |
da6d8c04 DJ |
3492 | } |
3493 | ||
2bd7c093 PA |
3494 | struct thread_resume_array |
3495 | { | |
3496 | struct thread_resume *resume; | |
3497 | size_t n; | |
3498 | }; | |
64386c31 | 3499 | |
ebcf782c DE |
3500 | /* This function is called once per thread via find_inferior. |
3501 | ARG is a pointer to a thread_resume_array struct. | |
3502 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
3503 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
3504 | |
3505 | This algorithm is O(threads * resume elements), but resume elements | |
3506 | is small (and will remain small at least until GDB supports thread | |
3507 | suspension). */ | |
ebcf782c | 3508 | |
2bd7c093 PA |
3509 | static int |
3510 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3511 | { |
d86d4aaf DE |
3512 | struct thread_info *thread = (struct thread_info *) entry; |
3513 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3514 | int ndx; |
2bd7c093 | 3515 | struct thread_resume_array *r; |
64386c31 | 3516 | |
2bd7c093 | 3517 | r = arg; |
64386c31 | 3518 | |
2bd7c093 | 3519 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3520 | { |
3521 | ptid_t ptid = r->resume[ndx].thread; | |
3522 | if (ptid_equal (ptid, minus_one_ptid) | |
3523 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
3524 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
3525 | of PID'. */ | |
d86d4aaf | 3526 | || (ptid_get_pid (ptid) == pid_of (thread) |
0c9070b3 YQ |
3527 | && (ptid_is_pid (ptid) |
3528 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 3529 | { |
d50171e4 | 3530 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3531 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3532 | { |
3533 | if (debug_threads) | |
87ce2a04 DE |
3534 | debug_printf ("already %s LWP %ld at GDB's request\n", |
3535 | (thread->last_status.kind | |
3536 | == TARGET_WAITKIND_STOPPED) | |
3537 | ? "stopped" | |
3538 | : "stopping", | |
d86d4aaf | 3539 | lwpid_of (thread)); |
d50171e4 PA |
3540 | |
3541 | continue; | |
3542 | } | |
3543 | ||
95954743 | 3544 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3545 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 3546 | |
c2d6af84 PA |
3547 | lwp->step_range_start = lwp->resume->step_range_start; |
3548 | lwp->step_range_end = lwp->resume->step_range_end; | |
3549 | ||
fa593d66 PA |
3550 | /* If we had a deferred signal to report, dequeue one now. |
3551 | This can happen if LWP gets more than one signal while | |
3552 | trying to get out of a jump pad. */ | |
3553 | if (lwp->stopped | |
3554 | && !lwp->status_pending_p | |
3555 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3556 | { | |
3557 | lwp->status_pending_p = 1; | |
3558 | ||
3559 | if (debug_threads) | |
87ce2a04 DE |
3560 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
3561 | "leaving status pending.\n", | |
d86d4aaf DE |
3562 | WSTOPSIG (lwp->status_pending), |
3563 | lwpid_of (thread)); | |
fa593d66 PA |
3564 | } |
3565 | ||
95954743 PA |
3566 | return 0; |
3567 | } | |
3568 | } | |
2bd7c093 PA |
3569 | |
3570 | /* No resume action for this thread. */ | |
3571 | lwp->resume = NULL; | |
64386c31 | 3572 | |
2bd7c093 | 3573 | return 0; |
5544ad89 DJ |
3574 | } |
3575 | ||
20ad9378 DE |
3576 | /* find_inferior callback for linux_resume. |
3577 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 3578 | |
bd99dc85 PA |
3579 | static int |
3580 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3581 | { |
d86d4aaf DE |
3582 | struct thread_info *thread = (struct thread_info *) entry; |
3583 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3584 | |
bd99dc85 PA |
3585 | /* LWPs which will not be resumed are not interesting, because |
3586 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3587 | if (lwp->resume == NULL) |
bd99dc85 | 3588 | return 0; |
64386c31 | 3589 | |
bd99dc85 | 3590 | if (lwp->status_pending_p) |
d50171e4 PA |
3591 | * (int *) flag_p = 1; |
3592 | ||
3593 | return 0; | |
3594 | } | |
3595 | ||
3596 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3597 | internal breakpoint that we need to step over. It assumes that any | |
3598 | required STOP_PC adjustment has already been propagated to the | |
3599 | inferior's regcache. */ | |
3600 | ||
3601 | static int | |
3602 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3603 | { | |
d86d4aaf DE |
3604 | struct thread_info *thread = (struct thread_info *) entry; |
3605 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
3606 | struct thread_info *saved_inferior; |
3607 | CORE_ADDR pc; | |
3608 | ||
3609 | /* LWPs which will not be resumed are not interesting, because we | |
3610 | might not wait for them next time through linux_wait. */ | |
3611 | ||
3612 | if (!lwp->stopped) | |
3613 | { | |
3614 | if (debug_threads) | |
87ce2a04 | 3615 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 3616 | lwpid_of (thread)); |
d50171e4 PA |
3617 | return 0; |
3618 | } | |
3619 | ||
8336d594 | 3620 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3621 | { |
3622 | if (debug_threads) | |
87ce2a04 DE |
3623 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
3624 | " stopped\n", | |
d86d4aaf | 3625 | lwpid_of (thread)); |
d50171e4 PA |
3626 | return 0; |
3627 | } | |
3628 | ||
7984d532 PA |
3629 | gdb_assert (lwp->suspended >= 0); |
3630 | ||
3631 | if (lwp->suspended) | |
3632 | { | |
3633 | if (debug_threads) | |
87ce2a04 | 3634 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 3635 | lwpid_of (thread)); |
7984d532 PA |
3636 | return 0; |
3637 | } | |
3638 | ||
d50171e4 PA |
3639 | if (!lwp->need_step_over) |
3640 | { | |
3641 | if (debug_threads) | |
d86d4aaf | 3642 | debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread)); |
d50171e4 | 3643 | } |
5544ad89 | 3644 | |
bd99dc85 | 3645 | if (lwp->status_pending_p) |
d50171e4 PA |
3646 | { |
3647 | if (debug_threads) | |
87ce2a04 DE |
3648 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
3649 | " status.\n", | |
d86d4aaf | 3650 | lwpid_of (thread)); |
d50171e4 PA |
3651 | return 0; |
3652 | } | |
3653 | ||
3654 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3655 | or we have. */ | |
3656 | pc = get_pc (lwp); | |
3657 | ||
3658 | /* If the PC has changed since we stopped, then don't do anything, | |
3659 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3660 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3661 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3662 | command, or poked thread's registers herself. */ | |
3663 | if (pc != lwp->stop_pc) | |
3664 | { | |
3665 | if (debug_threads) | |
87ce2a04 DE |
3666 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
3667 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
3668 | lwpid_of (thread), |
3669 | paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
3670 | |
3671 | lwp->need_step_over = 0; | |
3672 | return 0; | |
3673 | } | |
3674 | ||
3675 | saved_inferior = current_inferior; | |
8336d594 | 3676 | current_inferior = thread; |
d50171e4 | 3677 | |
8b07ae33 | 3678 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3679 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3680 | { |
8b07ae33 | 3681 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
3682 | though. If the condition is being evaluated on the target's side |
3683 | and it evaluate to false, step over this breakpoint as well. */ | |
3684 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
3685 | && gdb_condition_true_at_breakpoint (pc) |
3686 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
3687 | { |
3688 | if (debug_threads) | |
87ce2a04 DE |
3689 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
3690 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 3691 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 3692 | |
8b07ae33 PA |
3693 | current_inferior = saved_inferior; |
3694 | return 0; | |
3695 | } | |
3696 | else | |
3697 | { | |
3698 | if (debug_threads) | |
87ce2a04 DE |
3699 | debug_printf ("Need step over [LWP %ld]? yes, " |
3700 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 3701 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 3702 | |
8b07ae33 PA |
3703 | /* We've found an lwp that needs stepping over --- return 1 so |
3704 | that find_inferior stops looking. */ | |
3705 | current_inferior = saved_inferior; | |
3706 | ||
3707 | /* If the step over is cancelled, this is set again. */ | |
3708 | lwp->need_step_over = 0; | |
3709 | return 1; | |
3710 | } | |
d50171e4 PA |
3711 | } |
3712 | ||
3713 | current_inferior = saved_inferior; | |
3714 | ||
3715 | if (debug_threads) | |
87ce2a04 DE |
3716 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
3717 | " at 0x%s\n", | |
d86d4aaf | 3718 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 3719 | |
bd99dc85 | 3720 | return 0; |
5544ad89 DJ |
3721 | } |
3722 | ||
d50171e4 PA |
3723 | /* Start a step-over operation on LWP. When LWP stopped at a |
3724 | breakpoint, to make progress, we need to remove the breakpoint out | |
3725 | of the way. If we let other threads run while we do that, they may | |
3726 | pass by the breakpoint location and miss hitting it. To avoid | |
3727 | that, a step-over momentarily stops all threads while LWP is | |
3728 | single-stepped while the breakpoint is temporarily uninserted from | |
3729 | the inferior. When the single-step finishes, we reinsert the | |
3730 | breakpoint, and let all threads that are supposed to be running, | |
3731 | run again. | |
3732 | ||
3733 | On targets that don't support hardware single-step, we don't | |
3734 | currently support full software single-stepping. Instead, we only | |
3735 | support stepping over the thread event breakpoint, by asking the | |
3736 | low target where to place a reinsert breakpoint. Since this | |
3737 | routine assumes the breakpoint being stepped over is a thread event | |
3738 | breakpoint, it usually assumes the return address of the current | |
3739 | function is a good enough place to set the reinsert breakpoint. */ | |
3740 | ||
3741 | static int | |
3742 | start_step_over (struct lwp_info *lwp) | |
3743 | { | |
d86d4aaf | 3744 | struct thread_info *thread = get_lwp_thread (lwp); |
d50171e4 PA |
3745 | struct thread_info *saved_inferior; |
3746 | CORE_ADDR pc; | |
3747 | int step; | |
3748 | ||
3749 | if (debug_threads) | |
87ce2a04 | 3750 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 3751 | lwpid_of (thread)); |
d50171e4 | 3752 | |
7984d532 PA |
3753 | stop_all_lwps (1, lwp); |
3754 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3755 | |
3756 | if (debug_threads) | |
87ce2a04 | 3757 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
3758 | |
3759 | /* Note, we should always reach here with an already adjusted PC, | |
3760 | either by GDB (if we're resuming due to GDB's request), or by our | |
3761 | caller, if we just finished handling an internal breakpoint GDB | |
3762 | shouldn't care about. */ | |
3763 | pc = get_pc (lwp); | |
3764 | ||
3765 | saved_inferior = current_inferior; | |
d86d4aaf | 3766 | current_inferior = thread; |
d50171e4 PA |
3767 | |
3768 | lwp->bp_reinsert = pc; | |
3769 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3770 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3771 | |
3772 | if (can_hardware_single_step ()) | |
3773 | { | |
3774 | step = 1; | |
3775 | } | |
3776 | else | |
3777 | { | |
3778 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3779 | set_reinsert_breakpoint (raddr); | |
3780 | step = 0; | |
3781 | } | |
3782 | ||
3783 | current_inferior = saved_inferior; | |
3784 | ||
3785 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3786 | ||
3787 | /* Require next event from this LWP. */ | |
d86d4aaf | 3788 | step_over_bkpt = thread->entry.id; |
d50171e4 PA |
3789 | return 1; |
3790 | } | |
3791 | ||
3792 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3793 | start_step_over, if still there, and delete any reinsert | |
3794 | breakpoints we've set, on non hardware single-step targets. */ | |
3795 | ||
3796 | static int | |
3797 | finish_step_over (struct lwp_info *lwp) | |
3798 | { | |
3799 | if (lwp->bp_reinsert != 0) | |
3800 | { | |
3801 | if (debug_threads) | |
87ce2a04 | 3802 | debug_printf ("Finished step over.\n"); |
d50171e4 PA |
3803 | |
3804 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3805 | may be no breakpoint to reinsert there by now. */ | |
3806 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3807 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3808 | |
3809 | lwp->bp_reinsert = 0; | |
3810 | ||
3811 | /* Delete any software-single-step reinsert breakpoints. No | |
3812 | longer needed. We don't have to worry about other threads | |
3813 | hitting this trap, and later not being able to explain it, | |
3814 | because we were stepping over a breakpoint, and we hold all | |
3815 | threads but LWP stopped while doing that. */ | |
3816 | if (!can_hardware_single_step ()) | |
3817 | delete_reinsert_breakpoints (); | |
3818 | ||
3819 | step_over_bkpt = null_ptid; | |
3820 | return 1; | |
3821 | } | |
3822 | else | |
3823 | return 0; | |
3824 | } | |
3825 | ||
5544ad89 DJ |
3826 | /* This function is called once per thread. We check the thread's resume |
3827 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3828 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3829 | |
bd99dc85 PA |
3830 | For threads which we aren't explicitly told otherwise, we preserve |
3831 | the stepping flag; this is used for stepping over gdbserver-placed | |
3832 | breakpoints. | |
3833 | ||
3834 | If pending_flags was set in any thread, we queue any needed | |
3835 | signals, since we won't actually resume. We already have a pending | |
3836 | event to report, so we don't need to preserve any step requests; | |
3837 | they should be re-issued if necessary. */ | |
3838 | ||
3839 | static int | |
3840 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3841 | { |
d86d4aaf DE |
3842 | struct thread_info *thread = (struct thread_info *) entry; |
3843 | struct lwp_info *lwp = get_thread_lwp (thread); | |
bd99dc85 | 3844 | int step; |
d50171e4 PA |
3845 | int leave_all_stopped = * (int *) arg; |
3846 | int leave_pending; | |
5544ad89 | 3847 | |
2bd7c093 | 3848 | if (lwp->resume == NULL) |
bd99dc85 | 3849 | return 0; |
5544ad89 | 3850 | |
bd99dc85 | 3851 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3852 | { |
bd99dc85 | 3853 | if (debug_threads) |
d86d4aaf | 3854 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
3855 | |
3856 | if (!lwp->stopped) | |
3857 | { | |
3858 | if (debug_threads) | |
d86d4aaf | 3859 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 3860 | |
d50171e4 PA |
3861 | /* Stop the thread, and wait for the event asynchronously, |
3862 | through the event loop. */ | |
02fc4de7 | 3863 | send_sigstop (lwp); |
bd99dc85 PA |
3864 | } |
3865 | else | |
3866 | { | |
3867 | if (debug_threads) | |
87ce2a04 | 3868 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 3869 | lwpid_of (thread)); |
d50171e4 PA |
3870 | |
3871 | /* The LWP may have been stopped in an internal event that | |
3872 | was not meant to be notified back to GDB (e.g., gdbserver | |
3873 | breakpoint), so we should be reporting a stop event in | |
3874 | this case too. */ | |
3875 | ||
3876 | /* If the thread already has a pending SIGSTOP, this is a | |
3877 | no-op. Otherwise, something later will presumably resume | |
3878 | the thread and this will cause it to cancel any pending | |
3879 | operation, due to last_resume_kind == resume_stop. If | |
3880 | the thread already has a pending status to report, we | |
3881 | will still report it the next time we wait - see | |
3882 | status_pending_p_callback. */ | |
1a981360 PA |
3883 | |
3884 | /* If we already have a pending signal to report, then | |
3885 | there's no need to queue a SIGSTOP, as this means we're | |
3886 | midway through moving the LWP out of the jumppad, and we | |
3887 | will report the pending signal as soon as that is | |
3888 | finished. */ | |
3889 | if (lwp->pending_signals_to_report == NULL) | |
3890 | send_sigstop (lwp); | |
bd99dc85 | 3891 | } |
32ca6d61 | 3892 | |
bd99dc85 PA |
3893 | /* For stop requests, we're done. */ |
3894 | lwp->resume = NULL; | |
fc7238bb | 3895 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3896 | return 0; |
5544ad89 DJ |
3897 | } |
3898 | ||
bd99dc85 PA |
3899 | /* If this thread which is about to be resumed has a pending status, |
3900 | then don't resume any threads - we can just report the pending | |
3901 | status. Make sure to queue any signals that would otherwise be | |
3902 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3903 | thread has a pending status. If there's a thread that needs the |
3904 | step-over-breakpoint dance, then don't resume any other thread | |
3905 | but that particular one. */ | |
3906 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3907 | |
d50171e4 | 3908 | if (!leave_pending) |
bd99dc85 PA |
3909 | { |
3910 | if (debug_threads) | |
d86d4aaf | 3911 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 3912 | |
d50171e4 | 3913 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3914 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3915 | } |
3916 | else | |
3917 | { | |
3918 | if (debug_threads) | |
d86d4aaf | 3919 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
5544ad89 | 3920 | |
bd99dc85 PA |
3921 | /* If we have a new signal, enqueue the signal. */ |
3922 | if (lwp->resume->sig != 0) | |
3923 | { | |
3924 | struct pending_signals *p_sig; | |
3925 | p_sig = xmalloc (sizeof (*p_sig)); | |
3926 | p_sig->prev = lwp->pending_signals; | |
3927 | p_sig->signal = lwp->resume->sig; | |
3928 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3929 | ||
3930 | /* If this is the same signal we were previously stopped by, | |
3931 | make sure to queue its siginfo. We can ignore the return | |
3932 | value of ptrace; if it fails, we'll skip | |
3933 | PTRACE_SETSIGINFO. */ | |
3934 | if (WIFSTOPPED (lwp->last_status) | |
3935 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
d86d4aaf | 3936 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3937 | &p_sig->info); |
bd99dc85 PA |
3938 | |
3939 | lwp->pending_signals = p_sig; | |
3940 | } | |
3941 | } | |
5544ad89 | 3942 | |
fc7238bb | 3943 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3944 | lwp->resume = NULL; |
5544ad89 | 3945 | return 0; |
0d62e5e8 DJ |
3946 | } |
3947 | ||
3948 | static void | |
2bd7c093 | 3949 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3950 | { |
2bd7c093 | 3951 | struct thread_resume_array array = { resume_info, n }; |
d86d4aaf | 3952 | struct thread_info *need_step_over = NULL; |
d50171e4 PA |
3953 | int any_pending; |
3954 | int leave_all_stopped; | |
c6ecbae5 | 3955 | |
87ce2a04 DE |
3956 | if (debug_threads) |
3957 | { | |
3958 | debug_enter (); | |
3959 | debug_printf ("linux_resume:\n"); | |
3960 | } | |
3961 | ||
2bd7c093 | 3962 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3963 | |
d50171e4 PA |
3964 | /* If there is a thread which would otherwise be resumed, which has |
3965 | a pending status, then don't resume any threads - we can just | |
3966 | report the pending status. Make sure to queue any signals that | |
3967 | would otherwise be sent. In non-stop mode, we'll apply this | |
3968 | logic to each thread individually. We consume all pending events | |
3969 | before considering to start a step-over (in all-stop). */ | |
3970 | any_pending = 0; | |
bd99dc85 | 3971 | if (!non_stop) |
d86d4aaf | 3972 | find_inferior (&all_threads, resume_status_pending_p, &any_pending); |
d50171e4 PA |
3973 | |
3974 | /* If there is a thread which would otherwise be resumed, which is | |
3975 | stopped at a breakpoint that needs stepping over, then don't | |
3976 | resume any threads - have it step over the breakpoint with all | |
3977 | other threads stopped, then resume all threads again. Make sure | |
3978 | to queue any signals that would otherwise be delivered or | |
3979 | queued. */ | |
3980 | if (!any_pending && supports_breakpoints ()) | |
3981 | need_step_over | |
d86d4aaf DE |
3982 | = (struct thread_info *) find_inferior (&all_threads, |
3983 | need_step_over_p, NULL); | |
d50171e4 PA |
3984 | |
3985 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
3986 | ||
3987 | if (debug_threads) | |
3988 | { | |
3989 | if (need_step_over != NULL) | |
87ce2a04 | 3990 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 3991 | else if (any_pending) |
87ce2a04 DE |
3992 | debug_printf ("Not resuming, all-stop and found " |
3993 | "an LWP with pending status\n"); | |
d50171e4 | 3994 | else |
87ce2a04 | 3995 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
3996 | } |
3997 | ||
3998 | /* Even if we're leaving threads stopped, queue all signals we'd | |
3999 | otherwise deliver. */ | |
4000 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
4001 | ||
4002 | if (need_step_over) | |
d86d4aaf | 4003 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4004 | |
4005 | if (debug_threads) | |
4006 | { | |
4007 | debug_printf ("linux_resume done\n"); | |
4008 | debug_exit (); | |
4009 | } | |
d50171e4 PA |
4010 | } |
4011 | ||
4012 | /* This function is called once per thread. We check the thread's | |
4013 | last resume request, which will tell us whether to resume, step, or | |
4014 | leave the thread stopped. Any signal the client requested to be | |
4015 | delivered has already been enqueued at this point. | |
4016 | ||
4017 | If any thread that GDB wants running is stopped at an internal | |
4018 | breakpoint that needs stepping over, we start a step-over operation | |
4019 | on that particular thread, and leave all others stopped. */ | |
4020 | ||
7984d532 PA |
4021 | static int |
4022 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 4023 | { |
d86d4aaf DE |
4024 | struct thread_info *thread = (struct thread_info *) entry; |
4025 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
4026 | int step; |
4027 | ||
7984d532 PA |
4028 | if (lwp == except) |
4029 | return 0; | |
d50171e4 PA |
4030 | |
4031 | if (debug_threads) | |
d86d4aaf | 4032 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4033 | |
4034 | if (!lwp->stopped) | |
4035 | { | |
4036 | if (debug_threads) | |
d86d4aaf | 4037 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
7984d532 | 4038 | return 0; |
d50171e4 PA |
4039 | } |
4040 | ||
02fc4de7 PA |
4041 | if (thread->last_resume_kind == resume_stop |
4042 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4043 | { |
4044 | if (debug_threads) | |
87ce2a04 | 4045 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4046 | lwpid_of (thread)); |
7984d532 | 4047 | return 0; |
d50171e4 PA |
4048 | } |
4049 | ||
4050 | if (lwp->status_pending_p) | |
4051 | { | |
4052 | if (debug_threads) | |
87ce2a04 | 4053 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4054 | lwpid_of (thread)); |
7984d532 | 4055 | return 0; |
d50171e4 PA |
4056 | } |
4057 | ||
7984d532 PA |
4058 | gdb_assert (lwp->suspended >= 0); |
4059 | ||
d50171e4 PA |
4060 | if (lwp->suspended) |
4061 | { | |
4062 | if (debug_threads) | |
d86d4aaf | 4063 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
7984d532 | 4064 | return 0; |
d50171e4 PA |
4065 | } |
4066 | ||
1a981360 PA |
4067 | if (thread->last_resume_kind == resume_stop |
4068 | && lwp->pending_signals_to_report == NULL | |
4069 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
4070 | { |
4071 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4072 | last_status.kind check above would catch it, and we wouldn't | |
4073 | reach here. This LWP may have been momentarily paused by a | |
4074 | stop_all_lwps call while handling for example, another LWP's | |
4075 | step-over. In that case, the pending expected SIGSTOP signal | |
4076 | that was queued at vCont;t handling time will have already | |
4077 | been consumed by wait_for_sigstop, and so we need to requeue | |
4078 | another one here. Note that if the LWP already has a SIGSTOP | |
4079 | pending, this is a no-op. */ | |
4080 | ||
4081 | if (debug_threads) | |
87ce2a04 DE |
4082 | debug_printf ("Client wants LWP %ld to stop. " |
4083 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 4084 | lwpid_of (thread)); |
02fc4de7 PA |
4085 | |
4086 | send_sigstop (lwp); | |
4087 | } | |
4088 | ||
8336d594 | 4089 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 4090 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
4091 | return 0; |
4092 | } | |
4093 | ||
4094 | static int | |
4095 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
4096 | { | |
d86d4aaf DE |
4097 | struct thread_info *thread = (struct thread_info *) entry; |
4098 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
4099 | |
4100 | if (lwp == except) | |
4101 | return 0; | |
4102 | ||
4103 | lwp->suspended--; | |
4104 | gdb_assert (lwp->suspended >= 0); | |
4105 | ||
4106 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
4107 | } |
4108 | ||
4109 | /* When we finish a step-over, set threads running again. If there's | |
4110 | another thread that may need a step-over, now's the time to start | |
4111 | it. Eventually, we'll move all threads past their breakpoints. */ | |
4112 | ||
4113 | static void | |
4114 | proceed_all_lwps (void) | |
4115 | { | |
d86d4aaf | 4116 | struct thread_info *need_step_over; |
d50171e4 PA |
4117 | |
4118 | /* If there is a thread which would otherwise be resumed, which is | |
4119 | stopped at a breakpoint that needs stepping over, then don't | |
4120 | resume any threads - have it step over the breakpoint with all | |
4121 | other threads stopped, then resume all threads again. */ | |
4122 | ||
4123 | if (supports_breakpoints ()) | |
4124 | { | |
4125 | need_step_over | |
d86d4aaf DE |
4126 | = (struct thread_info *) find_inferior (&all_threads, |
4127 | need_step_over_p, NULL); | |
d50171e4 PA |
4128 | |
4129 | if (need_step_over != NULL) | |
4130 | { | |
4131 | if (debug_threads) | |
87ce2a04 DE |
4132 | debug_printf ("proceed_all_lwps: found " |
4133 | "thread %ld needing a step-over\n", | |
4134 | lwpid_of (need_step_over)); | |
d50171e4 | 4135 | |
d86d4aaf | 4136 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
4137 | return; |
4138 | } | |
4139 | } | |
5544ad89 | 4140 | |
d50171e4 | 4141 | if (debug_threads) |
87ce2a04 | 4142 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 4143 | |
d86d4aaf | 4144 | find_inferior (&all_threads, proceed_one_lwp, NULL); |
d50171e4 PA |
4145 | } |
4146 | ||
4147 | /* Stopped LWPs that the client wanted to be running, that don't have | |
4148 | pending statuses, are set to run again, except for EXCEPT, if not | |
4149 | NULL. This undoes a stop_all_lwps call. */ | |
4150 | ||
4151 | static void | |
7984d532 | 4152 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 4153 | { |
5544ad89 DJ |
4154 | if (debug_threads) |
4155 | { | |
87ce2a04 | 4156 | debug_enter (); |
d50171e4 | 4157 | if (except) |
87ce2a04 | 4158 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 4159 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 4160 | else |
87ce2a04 | 4161 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
4162 | } |
4163 | ||
7984d532 | 4164 | if (unsuspend) |
d86d4aaf | 4165 | find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except); |
7984d532 | 4166 | else |
d86d4aaf | 4167 | find_inferior (&all_threads, proceed_one_lwp, except); |
87ce2a04 DE |
4168 | |
4169 | if (debug_threads) | |
4170 | { | |
4171 | debug_printf ("unstop_all_lwps done\n"); | |
4172 | debug_exit (); | |
4173 | } | |
0d62e5e8 DJ |
4174 | } |
4175 | ||
58caa3dc DJ |
4176 | |
4177 | #ifdef HAVE_LINUX_REGSETS | |
4178 | ||
1faeff08 MR |
4179 | #define use_linux_regsets 1 |
4180 | ||
030031ee PA |
4181 | /* Returns true if REGSET has been disabled. */ |
4182 | ||
4183 | static int | |
4184 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
4185 | { | |
4186 | return (info->disabled_regsets != NULL | |
4187 | && info->disabled_regsets[regset - info->regsets]); | |
4188 | } | |
4189 | ||
4190 | /* Disable REGSET. */ | |
4191 | ||
4192 | static void | |
4193 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
4194 | { | |
4195 | int dr_offset; | |
4196 | ||
4197 | dr_offset = regset - info->regsets; | |
4198 | if (info->disabled_regsets == NULL) | |
4199 | info->disabled_regsets = xcalloc (1, info->num_regsets); | |
4200 | info->disabled_regsets[dr_offset] = 1; | |
4201 | } | |
4202 | ||
58caa3dc | 4203 | static int |
3aee8918 PA |
4204 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
4205 | struct regcache *regcache) | |
58caa3dc DJ |
4206 | { |
4207 | struct regset_info *regset; | |
e9d25b98 | 4208 | int saw_general_regs = 0; |
95954743 | 4209 | int pid; |
1570b33e | 4210 | struct iovec iov; |
58caa3dc | 4211 | |
3aee8918 | 4212 | regset = regsets_info->regsets; |
58caa3dc | 4213 | |
d86d4aaf | 4214 | pid = lwpid_of (current_inferior); |
58caa3dc DJ |
4215 | while (regset->size >= 0) |
4216 | { | |
1570b33e L |
4217 | void *buf, *data; |
4218 | int nt_type, res; | |
58caa3dc | 4219 | |
030031ee | 4220 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
58caa3dc DJ |
4221 | { |
4222 | regset ++; | |
4223 | continue; | |
4224 | } | |
4225 | ||
bca929d3 | 4226 | buf = xmalloc (regset->size); |
1570b33e L |
4227 | |
4228 | nt_type = regset->nt_type; | |
4229 | if (nt_type) | |
4230 | { | |
4231 | iov.iov_base = buf; | |
4232 | iov.iov_len = regset->size; | |
4233 | data = (void *) &iov; | |
4234 | } | |
4235 | else | |
4236 | data = buf; | |
4237 | ||
dfb64f85 | 4238 | #ifndef __sparc__ |
f15f9948 | 4239 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4240 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4241 | #else |
1570b33e | 4242 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4243 | #endif |
58caa3dc DJ |
4244 | if (res < 0) |
4245 | { | |
4246 | if (errno == EIO) | |
4247 | { | |
52fa2412 | 4248 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4249 | this process mode. */ |
030031ee | 4250 | disable_regset (regsets_info, regset); |
fdeb2a12 | 4251 | free (buf); |
52fa2412 | 4252 | continue; |
58caa3dc DJ |
4253 | } |
4254 | else | |
4255 | { | |
0d62e5e8 | 4256 | char s[256]; |
95954743 PA |
4257 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4258 | pid); | |
0d62e5e8 | 4259 | perror (s); |
58caa3dc DJ |
4260 | } |
4261 | } | |
e9d25b98 DJ |
4262 | else if (regset->type == GENERAL_REGS) |
4263 | saw_general_regs = 1; | |
442ea881 | 4264 | regset->store_function (regcache, buf); |
58caa3dc | 4265 | regset ++; |
fdeb2a12 | 4266 | free (buf); |
58caa3dc | 4267 | } |
e9d25b98 DJ |
4268 | if (saw_general_regs) |
4269 | return 0; | |
4270 | else | |
4271 | return 1; | |
58caa3dc DJ |
4272 | } |
4273 | ||
4274 | static int | |
3aee8918 PA |
4275 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
4276 | struct regcache *regcache) | |
58caa3dc DJ |
4277 | { |
4278 | struct regset_info *regset; | |
e9d25b98 | 4279 | int saw_general_regs = 0; |
95954743 | 4280 | int pid; |
1570b33e | 4281 | struct iovec iov; |
58caa3dc | 4282 | |
3aee8918 | 4283 | regset = regsets_info->regsets; |
58caa3dc | 4284 | |
d86d4aaf | 4285 | pid = lwpid_of (current_inferior); |
58caa3dc DJ |
4286 | while (regset->size >= 0) |
4287 | { | |
1570b33e L |
4288 | void *buf, *data; |
4289 | int nt_type, res; | |
58caa3dc | 4290 | |
030031ee | 4291 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
58caa3dc DJ |
4292 | { |
4293 | regset ++; | |
4294 | continue; | |
4295 | } | |
4296 | ||
bca929d3 | 4297 | buf = xmalloc (regset->size); |
545587ee DJ |
4298 | |
4299 | /* First fill the buffer with the current register set contents, | |
4300 | in case there are any items in the kernel's regset that are | |
4301 | not in gdbserver's regcache. */ | |
1570b33e L |
4302 | |
4303 | nt_type = regset->nt_type; | |
4304 | if (nt_type) | |
4305 | { | |
4306 | iov.iov_base = buf; | |
4307 | iov.iov_len = regset->size; | |
4308 | data = (void *) &iov; | |
4309 | } | |
4310 | else | |
4311 | data = buf; | |
4312 | ||
dfb64f85 | 4313 | #ifndef __sparc__ |
f15f9948 | 4314 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4315 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4316 | #else |
689cc2ae | 4317 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4318 | #endif |
545587ee DJ |
4319 | |
4320 | if (res == 0) | |
4321 | { | |
4322 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4323 | regset->fill_function (regcache, buf); |
545587ee DJ |
4324 | |
4325 | /* Only now do we write the register set. */ | |
dfb64f85 | 4326 | #ifndef __sparc__ |
f15f9948 | 4327 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 4328 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4329 | #else |
1570b33e | 4330 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4331 | #endif |
545587ee DJ |
4332 | } |
4333 | ||
58caa3dc DJ |
4334 | if (res < 0) |
4335 | { | |
4336 | if (errno == EIO) | |
4337 | { | |
52fa2412 | 4338 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4339 | this process mode. */ |
030031ee | 4340 | disable_regset (regsets_info, regset); |
fdeb2a12 | 4341 | free (buf); |
52fa2412 | 4342 | continue; |
58caa3dc | 4343 | } |
3221518c UW |
4344 | else if (errno == ESRCH) |
4345 | { | |
1b3f6016 PA |
4346 | /* At this point, ESRCH should mean the process is |
4347 | already gone, in which case we simply ignore attempts | |
4348 | to change its registers. See also the related | |
4349 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4350 | free (buf); |
3221518c UW |
4351 | return 0; |
4352 | } | |
58caa3dc DJ |
4353 | else |
4354 | { | |
ce3a066d | 4355 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4356 | } |
4357 | } | |
e9d25b98 DJ |
4358 | else if (regset->type == GENERAL_REGS) |
4359 | saw_general_regs = 1; | |
58caa3dc | 4360 | regset ++; |
09ec9b38 | 4361 | free (buf); |
58caa3dc | 4362 | } |
e9d25b98 DJ |
4363 | if (saw_general_regs) |
4364 | return 0; | |
4365 | else | |
4366 | return 1; | |
58caa3dc DJ |
4367 | } |
4368 | ||
1faeff08 | 4369 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4370 | |
1faeff08 | 4371 | #define use_linux_regsets 0 |
3aee8918 PA |
4372 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
4373 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 4374 | |
58caa3dc | 4375 | #endif |
1faeff08 MR |
4376 | |
4377 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4378 | calls or 0 if it has to be transferred individually. */ | |
4379 | ||
4380 | static int | |
3aee8918 | 4381 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
4382 | { |
4383 | unsigned char mask = 1 << (regno % 8); | |
4384 | size_t index = regno / 8; | |
4385 | ||
4386 | return (use_linux_regsets | |
3aee8918 PA |
4387 | && (regs_info->regset_bitmap == NULL |
4388 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
4389 | } |
4390 | ||
58caa3dc | 4391 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4392 | |
4393 | int | |
3aee8918 | 4394 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
4395 | { |
4396 | int addr; | |
4397 | ||
3aee8918 | 4398 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
4399 | error ("Invalid register number %d.", regnum); |
4400 | ||
3aee8918 | 4401 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
4402 | |
4403 | return addr; | |
4404 | } | |
4405 | ||
4406 | /* Fetch one register. */ | |
4407 | static void | |
3aee8918 PA |
4408 | fetch_register (const struct usrregs_info *usrregs, |
4409 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4410 | { |
4411 | CORE_ADDR regaddr; | |
4412 | int i, size; | |
4413 | char *buf; | |
4414 | int pid; | |
4415 | ||
3aee8918 | 4416 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4417 | return; |
4418 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4419 | return; | |
4420 | ||
3aee8918 | 4421 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4422 | if (regaddr == -1) |
4423 | return; | |
4424 | ||
3aee8918 PA |
4425 | size = ((register_size (regcache->tdesc, regno) |
4426 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4427 | & -sizeof (PTRACE_XFER_TYPE)); |
4428 | buf = alloca (size); | |
4429 | ||
d86d4aaf | 4430 | pid = lwpid_of (current_inferior); |
1faeff08 MR |
4431 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4432 | { | |
4433 | errno = 0; | |
4434 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4435 | ptrace (PTRACE_PEEKUSER, pid, | |
4436 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4437 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4438 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
4439 | regaddr += sizeof (PTRACE_XFER_TYPE); |
4440 | if (errno != 0) | |
4441 | error ("reading register %d: %s", regno, strerror (errno)); | |
4442 | } | |
4443 | ||
4444 | if (the_low_target.supply_ptrace_register) | |
4445 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4446 | else | |
4447 | supply_register (regcache, regno, buf); | |
4448 | } | |
4449 | ||
4450 | /* Store one register. */ | |
4451 | static void | |
3aee8918 PA |
4452 | store_register (const struct usrregs_info *usrregs, |
4453 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4454 | { |
4455 | CORE_ADDR regaddr; | |
4456 | int i, size; | |
4457 | char *buf; | |
4458 | int pid; | |
4459 | ||
3aee8918 | 4460 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4461 | return; |
4462 | if ((*the_low_target.cannot_store_register) (regno)) | |
4463 | return; | |
4464 | ||
3aee8918 | 4465 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4466 | if (regaddr == -1) |
4467 | return; | |
4468 | ||
3aee8918 PA |
4469 | size = ((register_size (regcache->tdesc, regno) |
4470 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4471 | & -sizeof (PTRACE_XFER_TYPE)); |
4472 | buf = alloca (size); | |
4473 | memset (buf, 0, size); | |
4474 | ||
4475 | if (the_low_target.collect_ptrace_register) | |
4476 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4477 | else | |
4478 | collect_register (regcache, regno, buf); | |
4479 | ||
d86d4aaf | 4480 | pid = lwpid_of (current_inferior); |
1faeff08 MR |
4481 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4482 | { | |
4483 | errno = 0; | |
4484 | ptrace (PTRACE_POKEUSER, pid, | |
4485 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4486 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4487 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
4488 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
4489 | if (errno != 0) |
4490 | { | |
4491 | /* At this point, ESRCH should mean the process is | |
4492 | already gone, in which case we simply ignore attempts | |
4493 | to change its registers. See also the related | |
4494 | comment in linux_resume_one_lwp. */ | |
4495 | if (errno == ESRCH) | |
4496 | return; | |
4497 | ||
4498 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4499 | error ("writing register %d: %s", regno, strerror (errno)); | |
4500 | } | |
4501 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4502 | } | |
4503 | } | |
4504 | ||
4505 | /* Fetch all registers, or just one, from the child process. | |
4506 | If REGNO is -1, do this for all registers, skipping any that are | |
4507 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4508 | unless ALL is non-zero. | |
4509 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4510 | static void | |
3aee8918 PA |
4511 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
4512 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4513 | { |
3aee8918 PA |
4514 | struct usrregs_info *usr = regs_info->usrregs; |
4515 | ||
1faeff08 MR |
4516 | if (regno == -1) |
4517 | { | |
3aee8918 PA |
4518 | for (regno = 0; regno < usr->num_regs; regno++) |
4519 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4520 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
4521 | } |
4522 | else | |
3aee8918 | 4523 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
4524 | } |
4525 | ||
4526 | /* Store our register values back into the inferior. | |
4527 | If REGNO is -1, do this for all registers, skipping any that are | |
4528 | assumed to have been saved by regsets_store_inferior_registers, | |
4529 | unless ALL is non-zero. | |
4530 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4531 | static void | |
3aee8918 PA |
4532 | usr_store_inferior_registers (const struct regs_info *regs_info, |
4533 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4534 | { |
3aee8918 PA |
4535 | struct usrregs_info *usr = regs_info->usrregs; |
4536 | ||
1faeff08 MR |
4537 | if (regno == -1) |
4538 | { | |
3aee8918 PA |
4539 | for (regno = 0; regno < usr->num_regs; regno++) |
4540 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4541 | store_register (usr, regcache, regno); | |
1faeff08 MR |
4542 | } |
4543 | else | |
3aee8918 | 4544 | store_register (usr, regcache, regno); |
1faeff08 MR |
4545 | } |
4546 | ||
4547 | #else /* !HAVE_LINUX_USRREGS */ | |
4548 | ||
3aee8918 PA |
4549 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
4550 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 4551 | |
58caa3dc | 4552 | #endif |
1faeff08 MR |
4553 | |
4554 | ||
4555 | void | |
4556 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4557 | { | |
4558 | int use_regsets; | |
4559 | int all = 0; | |
3aee8918 | 4560 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4561 | |
4562 | if (regno == -1) | |
4563 | { | |
3aee8918 PA |
4564 | if (the_low_target.fetch_register != NULL |
4565 | && regs_info->usrregs != NULL) | |
4566 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
4567 | (*the_low_target.fetch_register) (regcache, regno); |
4568 | ||
3aee8918 PA |
4569 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
4570 | if (regs_info->usrregs != NULL) | |
4571 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
4572 | } |
4573 | else | |
4574 | { | |
c14dfd32 PA |
4575 | if (the_low_target.fetch_register != NULL |
4576 | && (*the_low_target.fetch_register) (regcache, regno)) | |
4577 | return; | |
4578 | ||
3aee8918 | 4579 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4580 | if (use_regsets) |
3aee8918 PA |
4581 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
4582 | regcache); | |
4583 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4584 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4585 | } |
58caa3dc DJ |
4586 | } |
4587 | ||
4588 | void | |
442ea881 | 4589 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 4590 | { |
1faeff08 MR |
4591 | int use_regsets; |
4592 | int all = 0; | |
3aee8918 | 4593 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4594 | |
4595 | if (regno == -1) | |
4596 | { | |
3aee8918 PA |
4597 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4598 | regcache); | |
4599 | if (regs_info->usrregs != NULL) | |
4600 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
4601 | } |
4602 | else | |
4603 | { | |
3aee8918 | 4604 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4605 | if (use_regsets) |
3aee8918 PA |
4606 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4607 | regcache); | |
4608 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4609 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4610 | } |
58caa3dc DJ |
4611 | } |
4612 | ||
da6d8c04 | 4613 | |
da6d8c04 DJ |
4614 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4615 | to debugger memory starting at MYADDR. */ | |
4616 | ||
c3e735a6 | 4617 | static int |
f450004a | 4618 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 4619 | { |
d86d4aaf | 4620 | int pid = lwpid_of (current_inferior); |
4934b29e MR |
4621 | register PTRACE_XFER_TYPE *buffer; |
4622 | register CORE_ADDR addr; | |
4623 | register int count; | |
4624 | char filename[64]; | |
da6d8c04 | 4625 | register int i; |
4934b29e | 4626 | int ret; |
fd462a61 | 4627 | int fd; |
fd462a61 DJ |
4628 | |
4629 | /* Try using /proc. Don't bother for one word. */ | |
4630 | if (len >= 3 * sizeof (long)) | |
4631 | { | |
4934b29e MR |
4632 | int bytes; |
4633 | ||
fd462a61 DJ |
4634 | /* We could keep this file open and cache it - possibly one per |
4635 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4636 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4637 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4638 | if (fd == -1) | |
4639 | goto no_proc; | |
4640 | ||
4641 | /* If pread64 is available, use it. It's faster if the kernel | |
4642 | supports it (only one syscall), and it's 64-bit safe even on | |
4643 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4644 | application). */ | |
4645 | #ifdef HAVE_PREAD64 | |
4934b29e | 4646 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 4647 | #else |
4934b29e MR |
4648 | bytes = -1; |
4649 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
4650 | bytes = read (fd, myaddr, len); | |
fd462a61 | 4651 | #endif |
fd462a61 DJ |
4652 | |
4653 | close (fd); | |
4934b29e MR |
4654 | if (bytes == len) |
4655 | return 0; | |
4656 | ||
4657 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
4658 | if (bytes > 0) | |
4659 | { | |
4660 | memaddr += bytes; | |
4661 | myaddr += bytes; | |
4662 | len -= bytes; | |
4663 | } | |
fd462a61 | 4664 | } |
da6d8c04 | 4665 | |
fd462a61 | 4666 | no_proc: |
4934b29e MR |
4667 | /* Round starting address down to longword boundary. */ |
4668 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4669 | /* Round ending address up; get number of longwords that makes. */ | |
4670 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4671 | / sizeof (PTRACE_XFER_TYPE)); | |
4672 | /* Allocate buffer of that many longwords. */ | |
4673 | buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4674 | ||
da6d8c04 | 4675 | /* Read all the longwords */ |
4934b29e | 4676 | errno = 0; |
da6d8c04 DJ |
4677 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
4678 | { | |
14ce3065 DE |
4679 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4680 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4681 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
4682 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4683 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 4684 | if (errno) |
4934b29e | 4685 | break; |
da6d8c04 | 4686 | } |
4934b29e | 4687 | ret = errno; |
da6d8c04 DJ |
4688 | |
4689 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
4690 | if (i > 0) |
4691 | { | |
4692 | i *= sizeof (PTRACE_XFER_TYPE); | |
4693 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
4694 | memcpy (myaddr, | |
4695 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4696 | i < len ? i : len); | |
4697 | } | |
c3e735a6 | 4698 | |
4934b29e | 4699 | return ret; |
da6d8c04 DJ |
4700 | } |
4701 | ||
93ae6fdc PA |
4702 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4703 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 4704 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 4705 | |
ce3a066d | 4706 | static int |
f450004a | 4707 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4708 | { |
4709 | register int i; | |
4710 | /* Round starting address down to longword boundary. */ | |
4711 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4712 | /* Round ending address up; get number of longwords that makes. */ | |
4713 | register int count | |
493e2a69 MS |
4714 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4715 | / sizeof (PTRACE_XFER_TYPE); | |
4716 | ||
da6d8c04 | 4717 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4718 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4719 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4720 | ||
d86d4aaf | 4721 | int pid = lwpid_of (current_inferior); |
da6d8c04 | 4722 | |
f0ae6fc3 PA |
4723 | if (len == 0) |
4724 | { | |
4725 | /* Zero length write always succeeds. */ | |
4726 | return 0; | |
4727 | } | |
4728 | ||
0d62e5e8 DJ |
4729 | if (debug_threads) |
4730 | { | |
58d6951d DJ |
4731 | /* Dump up to four bytes. */ |
4732 | unsigned int val = * (unsigned int *) myaddr; | |
4733 | if (len == 1) | |
4734 | val = val & 0xff; | |
4735 | else if (len == 2) | |
4736 | val = val & 0xffff; | |
4737 | else if (len == 3) | |
4738 | val = val & 0xffffff; | |
87ce2a04 DE |
4739 | debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), |
4740 | val, (long)memaddr); | |
0d62e5e8 DJ |
4741 | } |
4742 | ||
da6d8c04 DJ |
4743 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4744 | ||
93ae6fdc | 4745 | errno = 0; |
14ce3065 DE |
4746 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4747 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4748 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
4749 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4750 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
4751 | if (errno) |
4752 | return errno; | |
da6d8c04 DJ |
4753 | |
4754 | if (count > 1) | |
4755 | { | |
93ae6fdc | 4756 | errno = 0; |
da6d8c04 | 4757 | buffer[count - 1] |
95954743 | 4758 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4759 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4760 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4761 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 4762 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 4763 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
4764 | if (errno) |
4765 | return errno; | |
da6d8c04 DJ |
4766 | } |
4767 | ||
93ae6fdc | 4768 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4769 | |
493e2a69 MS |
4770 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4771 | myaddr, len); | |
da6d8c04 DJ |
4772 | |
4773 | /* Write the entire buffer. */ | |
4774 | ||
4775 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4776 | { | |
4777 | errno = 0; | |
14ce3065 DE |
4778 | ptrace (PTRACE_POKETEXT, pid, |
4779 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4780 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4781 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4782 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
4783 | if (errno) |
4784 | return errno; | |
4785 | } | |
4786 | ||
4787 | return 0; | |
4788 | } | |
2f2893d9 DJ |
4789 | |
4790 | static void | |
4791 | linux_look_up_symbols (void) | |
4792 | { | |
0d62e5e8 | 4793 | #ifdef USE_THREAD_DB |
95954743 PA |
4794 | struct process_info *proc = current_process (); |
4795 | ||
cdbfd419 | 4796 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4797 | return; |
4798 | ||
96d7229d LM |
4799 | /* If the kernel supports tracing clones, then we don't need to |
4800 | use the magic thread event breakpoint to learn about | |
4801 | threads. */ | |
4802 | thread_db_init (!linux_supports_traceclone ()); | |
0d62e5e8 DJ |
4803 | #endif |
4804 | } | |
4805 | ||
e5379b03 | 4806 | static void |
ef57601b | 4807 | linux_request_interrupt (void) |
e5379b03 | 4808 | { |
a1928bad | 4809 | extern unsigned long signal_pid; |
e5379b03 | 4810 | |
95954743 PA |
4811 | if (!ptid_equal (cont_thread, null_ptid) |
4812 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 4813 | { |
bd99dc85 | 4814 | int lwpid; |
e5379b03 | 4815 | |
d86d4aaf | 4816 | lwpid = lwpid_of (current_inferior); |
bd99dc85 | 4817 | kill_lwp (lwpid, SIGINT); |
e5379b03 DJ |
4818 | } |
4819 | else | |
ef57601b | 4820 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
4821 | } |
4822 | ||
aa691b87 RM |
4823 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4824 | to debugger memory starting at MYADDR. */ | |
4825 | ||
4826 | static int | |
f450004a | 4827 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4828 | { |
4829 | char filename[PATH_MAX]; | |
4830 | int fd, n; | |
d86d4aaf | 4831 | int pid = lwpid_of (current_inferior); |
aa691b87 | 4832 | |
6cebaf6e | 4833 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4834 | |
4835 | fd = open (filename, O_RDONLY); | |
4836 | if (fd < 0) | |
4837 | return -1; | |
4838 | ||
4839 | if (offset != (CORE_ADDR) 0 | |
4840 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4841 | n = -1; | |
4842 | else | |
4843 | n = read (fd, myaddr, len); | |
4844 | ||
4845 | close (fd); | |
4846 | ||
4847 | return n; | |
4848 | } | |
4849 | ||
d993e290 PA |
4850 | /* These breakpoint and watchpoint related wrapper functions simply |
4851 | pass on the function call if the target has registered a | |
4852 | corresponding function. */ | |
e013ee27 OF |
4853 | |
4854 | static int | |
d993e290 | 4855 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4856 | { |
d993e290 PA |
4857 | if (the_low_target.insert_point != NULL) |
4858 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
4859 | else |
4860 | /* Unsupported (see target.h). */ | |
4861 | return 1; | |
4862 | } | |
4863 | ||
4864 | static int | |
d993e290 | 4865 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4866 | { |
d993e290 PA |
4867 | if (the_low_target.remove_point != NULL) |
4868 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
4869 | else |
4870 | /* Unsupported (see target.h). */ | |
4871 | return 1; | |
4872 | } | |
4873 | ||
4874 | static int | |
4875 | linux_stopped_by_watchpoint (void) | |
4876 | { | |
c3adc08c PA |
4877 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4878 | ||
4879 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
4880 | } |
4881 | ||
4882 | static CORE_ADDR | |
4883 | linux_stopped_data_address (void) | |
4884 | { | |
c3adc08c PA |
4885 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4886 | ||
4887 | return lwp->stopped_data_address; | |
e013ee27 OF |
4888 | } |
4889 | ||
db0dfaa0 LM |
4890 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
4891 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
4892 | && defined(PT_TEXT_END_ADDR) | |
4893 | ||
4894 | /* This is only used for targets that define PT_TEXT_ADDR, | |
4895 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
4896 | the target has different ways of acquiring this information, like | |
4897 | loadmaps. */ | |
52fb6437 NS |
4898 | |
4899 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4900 | to tell gdb about. */ | |
4901 | ||
4902 | static int | |
4903 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4904 | { | |
52fb6437 | 4905 | unsigned long text, text_end, data; |
bd99dc85 | 4906 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
4907 | |
4908 | errno = 0; | |
4909 | ||
b8e1b30e LM |
4910 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
4911 | (PTRACE_TYPE_ARG4) 0); | |
4912 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
4913 | (PTRACE_TYPE_ARG4) 0); | |
4914 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
4915 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
4916 | |
4917 | if (errno == 0) | |
4918 | { | |
4919 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4920 | used by gdb) are relative to the beginning of the program, |
4921 | with the data segment immediately following the text segment. | |
4922 | However, the actual runtime layout in memory may put the data | |
4923 | somewhere else, so when we send gdb a data base-address, we | |
4924 | use the real data base address and subtract the compile-time | |
4925 | data base-address from it (which is just the length of the | |
4926 | text segment). BSS immediately follows data in both | |
4927 | cases. */ | |
52fb6437 NS |
4928 | *text_p = text; |
4929 | *data_p = data - (text_end - text); | |
1b3f6016 | 4930 | |
52fb6437 NS |
4931 | return 1; |
4932 | } | |
52fb6437 NS |
4933 | return 0; |
4934 | } | |
4935 | #endif | |
4936 | ||
07e059b5 VP |
4937 | static int |
4938 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4939 | unsigned char *readbuf, unsigned const char *writebuf, |
4940 | CORE_ADDR offset, int len) | |
07e059b5 | 4941 | { |
d26e3629 | 4942 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4943 | } |
4944 | ||
d0722149 DE |
4945 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4946 | layout of the inferiors' architecture. */ | |
4947 | ||
4948 | static void | |
a5362b9a | 4949 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
4950 | { |
4951 | int done = 0; | |
4952 | ||
4953 | if (the_low_target.siginfo_fixup != NULL) | |
4954 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4955 | ||
4956 | /* If there was no callback, or the callback didn't do anything, | |
4957 | then just do a straight memcpy. */ | |
4958 | if (!done) | |
4959 | { | |
4960 | if (direction == 1) | |
a5362b9a | 4961 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 4962 | else |
a5362b9a | 4963 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
4964 | } |
4965 | } | |
4966 | ||
4aa995e1 PA |
4967 | static int |
4968 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
4969 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
4970 | { | |
d0722149 | 4971 | int pid; |
a5362b9a TS |
4972 | siginfo_t siginfo; |
4973 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 PA |
4974 | |
4975 | if (current_inferior == NULL) | |
4976 | return -1; | |
4977 | ||
d86d4aaf | 4978 | pid = lwpid_of (current_inferior); |
4aa995e1 PA |
4979 | |
4980 | if (debug_threads) | |
87ce2a04 DE |
4981 | debug_printf ("%s siginfo for lwp %d.\n", |
4982 | readbuf != NULL ? "Reading" : "Writing", | |
4983 | pid); | |
4aa995e1 | 4984 | |
0adea5f7 | 4985 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
4986 | return -1; |
4987 | ||
b8e1b30e | 4988 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
4989 | return -1; |
4990 | ||
d0722149 DE |
4991 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
4992 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4993 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
4994 | with a 32-bit GDBSERVER, we need to convert it. */ | |
4995 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4996 | ||
4aa995e1 PA |
4997 | if (offset + len > sizeof (siginfo)) |
4998 | len = sizeof (siginfo) - offset; | |
4999 | ||
5000 | if (readbuf != NULL) | |
d0722149 | 5001 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
5002 | else |
5003 | { | |
d0722149 DE |
5004 | memcpy (inf_siginfo + offset, writebuf, len); |
5005 | ||
5006 | /* Convert back to ptrace layout before flushing it out. */ | |
5007 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
5008 | ||
b8e1b30e | 5009 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5010 | return -1; |
5011 | } | |
5012 | ||
5013 | return len; | |
5014 | } | |
5015 | ||
bd99dc85 PA |
5016 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5017 | so we notice when children change state; as the handler for the | |
5018 | sigsuspend in my_waitpid. */ | |
5019 | ||
5020 | static void | |
5021 | sigchld_handler (int signo) | |
5022 | { | |
5023 | int old_errno = errno; | |
5024 | ||
5025 | if (debug_threads) | |
e581f2b4 PA |
5026 | { |
5027 | do | |
5028 | { | |
5029 | /* fprintf is not async-signal-safe, so call write | |
5030 | directly. */ | |
5031 | if (write (2, "sigchld_handler\n", | |
5032 | sizeof ("sigchld_handler\n") - 1) < 0) | |
5033 | break; /* just ignore */ | |
5034 | } while (0); | |
5035 | } | |
bd99dc85 PA |
5036 | |
5037 | if (target_is_async_p ()) | |
5038 | async_file_mark (); /* trigger a linux_wait */ | |
5039 | ||
5040 | errno = old_errno; | |
5041 | } | |
5042 | ||
5043 | static int | |
5044 | linux_supports_non_stop (void) | |
5045 | { | |
5046 | return 1; | |
5047 | } | |
5048 | ||
5049 | static int | |
5050 | linux_async (int enable) | |
5051 | { | |
5052 | int previous = (linux_event_pipe[0] != -1); | |
5053 | ||
8336d594 | 5054 | if (debug_threads) |
87ce2a04 DE |
5055 | debug_printf ("linux_async (%d), previous=%d\n", |
5056 | enable, previous); | |
8336d594 | 5057 | |
bd99dc85 PA |
5058 | if (previous != enable) |
5059 | { | |
5060 | sigset_t mask; | |
5061 | sigemptyset (&mask); | |
5062 | sigaddset (&mask, SIGCHLD); | |
5063 | ||
5064 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
5065 | ||
5066 | if (enable) | |
5067 | { | |
5068 | if (pipe (linux_event_pipe) == -1) | |
5069 | fatal ("creating event pipe failed."); | |
5070 | ||
5071 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5072 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5073 | ||
5074 | /* Register the event loop handler. */ | |
5075 | add_file_handler (linux_event_pipe[0], | |
5076 | handle_target_event, NULL); | |
5077 | ||
5078 | /* Always trigger a linux_wait. */ | |
5079 | async_file_mark (); | |
5080 | } | |
5081 | else | |
5082 | { | |
5083 | delete_file_handler (linux_event_pipe[0]); | |
5084 | ||
5085 | close (linux_event_pipe[0]); | |
5086 | close (linux_event_pipe[1]); | |
5087 | linux_event_pipe[0] = -1; | |
5088 | linux_event_pipe[1] = -1; | |
5089 | } | |
5090 | ||
5091 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5092 | } | |
5093 | ||
5094 | return previous; | |
5095 | } | |
5096 | ||
5097 | static int | |
5098 | linux_start_non_stop (int nonstop) | |
5099 | { | |
5100 | /* Register or unregister from event-loop accordingly. */ | |
5101 | linux_async (nonstop); | |
5102 | return 0; | |
5103 | } | |
5104 | ||
cf8fd78b PA |
5105 | static int |
5106 | linux_supports_multi_process (void) | |
5107 | { | |
5108 | return 1; | |
5109 | } | |
5110 | ||
03583c20 UW |
5111 | static int |
5112 | linux_supports_disable_randomization (void) | |
5113 | { | |
5114 | #ifdef HAVE_PERSONALITY | |
5115 | return 1; | |
5116 | #else | |
5117 | return 0; | |
5118 | #endif | |
5119 | } | |
efcbbd14 | 5120 | |
d1feda86 YQ |
5121 | static int |
5122 | linux_supports_agent (void) | |
5123 | { | |
5124 | return 1; | |
5125 | } | |
5126 | ||
c2d6af84 PA |
5127 | static int |
5128 | linux_supports_range_stepping (void) | |
5129 | { | |
5130 | if (*the_low_target.supports_range_stepping == NULL) | |
5131 | return 0; | |
5132 | ||
5133 | return (*the_low_target.supports_range_stepping) (); | |
5134 | } | |
5135 | ||
efcbbd14 UW |
5136 | /* Enumerate spufs IDs for process PID. */ |
5137 | static int | |
5138 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
5139 | { | |
5140 | int pos = 0; | |
5141 | int written = 0; | |
5142 | char path[128]; | |
5143 | DIR *dir; | |
5144 | struct dirent *entry; | |
5145 | ||
5146 | sprintf (path, "/proc/%ld/fd", pid); | |
5147 | dir = opendir (path); | |
5148 | if (!dir) | |
5149 | return -1; | |
5150 | ||
5151 | rewinddir (dir); | |
5152 | while ((entry = readdir (dir)) != NULL) | |
5153 | { | |
5154 | struct stat st; | |
5155 | struct statfs stfs; | |
5156 | int fd; | |
5157 | ||
5158 | fd = atoi (entry->d_name); | |
5159 | if (!fd) | |
5160 | continue; | |
5161 | ||
5162 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
5163 | if (stat (path, &st) != 0) | |
5164 | continue; | |
5165 | if (!S_ISDIR (st.st_mode)) | |
5166 | continue; | |
5167 | ||
5168 | if (statfs (path, &stfs) != 0) | |
5169 | continue; | |
5170 | if (stfs.f_type != SPUFS_MAGIC) | |
5171 | continue; | |
5172 | ||
5173 | if (pos >= offset && pos + 4 <= offset + len) | |
5174 | { | |
5175 | *(unsigned int *)(buf + pos - offset) = fd; | |
5176 | written += 4; | |
5177 | } | |
5178 | pos += 4; | |
5179 | } | |
5180 | ||
5181 | closedir (dir); | |
5182 | return written; | |
5183 | } | |
5184 | ||
5185 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5186 | object type, using the /proc file system. */ | |
5187 | static int | |
5188 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
5189 | unsigned const char *writebuf, | |
5190 | CORE_ADDR offset, int len) | |
5191 | { | |
d86d4aaf | 5192 | long pid = lwpid_of (current_inferior); |
efcbbd14 UW |
5193 | char buf[128]; |
5194 | int fd = 0; | |
5195 | int ret = 0; | |
5196 | ||
5197 | if (!writebuf && !readbuf) | |
5198 | return -1; | |
5199 | ||
5200 | if (!*annex) | |
5201 | { | |
5202 | if (!readbuf) | |
5203 | return -1; | |
5204 | else | |
5205 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5206 | } | |
5207 | ||
5208 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5209 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5210 | if (fd <= 0) | |
5211 | return -1; | |
5212 | ||
5213 | if (offset != 0 | |
5214 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5215 | { | |
5216 | close (fd); | |
5217 | return 0; | |
5218 | } | |
5219 | ||
5220 | if (writebuf) | |
5221 | ret = write (fd, writebuf, (size_t) len); | |
5222 | else | |
5223 | ret = read (fd, readbuf, (size_t) len); | |
5224 | ||
5225 | close (fd); | |
5226 | return ret; | |
5227 | } | |
5228 | ||
723b724b | 5229 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5230 | struct target_loadseg |
5231 | { | |
5232 | /* Core address to which the segment is mapped. */ | |
5233 | Elf32_Addr addr; | |
5234 | /* VMA recorded in the program header. */ | |
5235 | Elf32_Addr p_vaddr; | |
5236 | /* Size of this segment in memory. */ | |
5237 | Elf32_Word p_memsz; | |
5238 | }; | |
5239 | ||
723b724b | 5240 | # if defined PT_GETDSBT |
78d85199 YQ |
5241 | struct target_loadmap |
5242 | { | |
5243 | /* Protocol version number, must be zero. */ | |
5244 | Elf32_Word version; | |
5245 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5246 | unsigned *dsbt_table; | |
5247 | unsigned dsbt_size, dsbt_index; | |
5248 | /* Number of segments in this map. */ | |
5249 | Elf32_Word nsegs; | |
5250 | /* The actual memory map. */ | |
5251 | struct target_loadseg segs[/*nsegs*/]; | |
5252 | }; | |
723b724b MF |
5253 | # define LINUX_LOADMAP PT_GETDSBT |
5254 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5255 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5256 | # else | |
5257 | struct target_loadmap | |
5258 | { | |
5259 | /* Protocol version number, must be zero. */ | |
5260 | Elf32_Half version; | |
5261 | /* Number of segments in this map. */ | |
5262 | Elf32_Half nsegs; | |
5263 | /* The actual memory map. */ | |
5264 | struct target_loadseg segs[/*nsegs*/]; | |
5265 | }; | |
5266 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5267 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5268 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5269 | # endif | |
78d85199 | 5270 | |
78d85199 YQ |
5271 | static int |
5272 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5273 | unsigned char *myaddr, unsigned int len) | |
5274 | { | |
2eec7d5b | 5275 | int pid = lwpid_of (current_inferior); |
78d85199 YQ |
5276 | int addr = -1; |
5277 | struct target_loadmap *data = NULL; | |
5278 | unsigned int actual_length, copy_length; | |
5279 | ||
5280 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5281 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5282 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5283 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5284 | else |
5285 | return -1; | |
5286 | ||
723b724b | 5287 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5288 | return -1; |
5289 | ||
5290 | if (data == NULL) | |
5291 | return -1; | |
5292 | ||
5293 | actual_length = sizeof (struct target_loadmap) | |
5294 | + sizeof (struct target_loadseg) * data->nsegs; | |
5295 | ||
5296 | if (offset < 0 || offset > actual_length) | |
5297 | return -1; | |
5298 | ||
5299 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5300 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5301 | return copy_length; | |
5302 | } | |
723b724b MF |
5303 | #else |
5304 | # define linux_read_loadmap NULL | |
5305 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5306 | |
1570b33e L |
5307 | static void |
5308 | linux_process_qsupported (const char *query) | |
5309 | { | |
5310 | if (the_low_target.process_qsupported != NULL) | |
5311 | the_low_target.process_qsupported (query); | |
5312 | } | |
5313 | ||
219f2f23 PA |
5314 | static int |
5315 | linux_supports_tracepoints (void) | |
5316 | { | |
5317 | if (*the_low_target.supports_tracepoints == NULL) | |
5318 | return 0; | |
5319 | ||
5320 | return (*the_low_target.supports_tracepoints) (); | |
5321 | } | |
5322 | ||
5323 | static CORE_ADDR | |
5324 | linux_read_pc (struct regcache *regcache) | |
5325 | { | |
5326 | if (the_low_target.get_pc == NULL) | |
5327 | return 0; | |
5328 | ||
5329 | return (*the_low_target.get_pc) (regcache); | |
5330 | } | |
5331 | ||
5332 | static void | |
5333 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5334 | { | |
5335 | gdb_assert (the_low_target.set_pc != NULL); | |
5336 | ||
5337 | (*the_low_target.set_pc) (regcache, pc); | |
5338 | } | |
5339 | ||
8336d594 PA |
5340 | static int |
5341 | linux_thread_stopped (struct thread_info *thread) | |
5342 | { | |
5343 | return get_thread_lwp (thread)->stopped; | |
5344 | } | |
5345 | ||
5346 | /* This exposes stop-all-threads functionality to other modules. */ | |
5347 | ||
5348 | static void | |
7984d532 | 5349 | linux_pause_all (int freeze) |
8336d594 | 5350 | { |
7984d532 PA |
5351 | stop_all_lwps (freeze, NULL); |
5352 | } | |
5353 | ||
5354 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5355 | modules. */ | |
5356 | ||
5357 | static void | |
5358 | linux_unpause_all (int unfreeze) | |
5359 | { | |
5360 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5361 | } |
5362 | ||
90d74c30 PA |
5363 | static int |
5364 | linux_prepare_to_access_memory (void) | |
5365 | { | |
5366 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5367 | running LWP. */ | |
5368 | if (non_stop) | |
5369 | linux_pause_all (1); | |
5370 | return 0; | |
5371 | } | |
5372 | ||
5373 | static void | |
0146f85b | 5374 | linux_done_accessing_memory (void) |
90d74c30 PA |
5375 | { |
5376 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5377 | running LWP. */ | |
5378 | if (non_stop) | |
5379 | linux_unpause_all (1); | |
5380 | } | |
5381 | ||
fa593d66 PA |
5382 | static int |
5383 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5384 | CORE_ADDR collector, | |
5385 | CORE_ADDR lockaddr, | |
5386 | ULONGEST orig_size, | |
5387 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5388 | CORE_ADDR *trampoline, |
5389 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5390 | unsigned char *jjump_pad_insn, |
5391 | ULONGEST *jjump_pad_insn_size, | |
5392 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5393 | CORE_ADDR *adjusted_insn_addr_end, |
5394 | char *err) | |
fa593d66 PA |
5395 | { |
5396 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5397 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5398 | jump_entry, trampoline, trampoline_size, |
5399 | jjump_pad_insn, jjump_pad_insn_size, | |
5400 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5401 | err); | |
fa593d66 PA |
5402 | } |
5403 | ||
6a271cae PA |
5404 | static struct emit_ops * |
5405 | linux_emit_ops (void) | |
5406 | { | |
5407 | if (the_low_target.emit_ops != NULL) | |
5408 | return (*the_low_target.emit_ops) (); | |
5409 | else | |
5410 | return NULL; | |
5411 | } | |
5412 | ||
405f8e94 SS |
5413 | static int |
5414 | linux_get_min_fast_tracepoint_insn_len (void) | |
5415 | { | |
5416 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5417 | } | |
5418 | ||
2268b414 JK |
5419 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5420 | ||
5421 | static int | |
5422 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5423 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5424 | { | |
5425 | char filename[PATH_MAX]; | |
5426 | int fd; | |
5427 | const int auxv_size = is_elf64 | |
5428 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5429 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5430 | ||
5431 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5432 | ||
5433 | fd = open (filename, O_RDONLY); | |
5434 | if (fd < 0) | |
5435 | return 1; | |
5436 | ||
5437 | *phdr_memaddr = 0; | |
5438 | *num_phdr = 0; | |
5439 | while (read (fd, buf, auxv_size) == auxv_size | |
5440 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5441 | { | |
5442 | if (is_elf64) | |
5443 | { | |
5444 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5445 | ||
5446 | switch (aux->a_type) | |
5447 | { | |
5448 | case AT_PHDR: | |
5449 | *phdr_memaddr = aux->a_un.a_val; | |
5450 | break; | |
5451 | case AT_PHNUM: | |
5452 | *num_phdr = aux->a_un.a_val; | |
5453 | break; | |
5454 | } | |
5455 | } | |
5456 | else | |
5457 | { | |
5458 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5459 | ||
5460 | switch (aux->a_type) | |
5461 | { | |
5462 | case AT_PHDR: | |
5463 | *phdr_memaddr = aux->a_un.a_val; | |
5464 | break; | |
5465 | case AT_PHNUM: | |
5466 | *num_phdr = aux->a_un.a_val; | |
5467 | break; | |
5468 | } | |
5469 | } | |
5470 | } | |
5471 | ||
5472 | close (fd); | |
5473 | ||
5474 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5475 | { | |
5476 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5477 | "phdr_memaddr = %ld, phdr_num = %d", | |
5478 | (long) *phdr_memaddr, *num_phdr); | |
5479 | return 2; | |
5480 | } | |
5481 | ||
5482 | return 0; | |
5483 | } | |
5484 | ||
5485 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5486 | ||
5487 | static CORE_ADDR | |
5488 | get_dynamic (const int pid, const int is_elf64) | |
5489 | { | |
5490 | CORE_ADDR phdr_memaddr, relocation; | |
5491 | int num_phdr, i; | |
5492 | unsigned char *phdr_buf; | |
5493 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5494 | ||
5495 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5496 | return 0; | |
5497 | ||
5498 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5499 | phdr_buf = alloca (num_phdr * phdr_size); | |
5500 | ||
5501 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5502 | return 0; | |
5503 | ||
5504 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5505 | non-zero for PIE ones. */ | |
5506 | relocation = -1; | |
5507 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5508 | if (is_elf64) | |
5509 | { | |
5510 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5511 | ||
5512 | if (p->p_type == PT_PHDR) | |
5513 | relocation = phdr_memaddr - p->p_vaddr; | |
5514 | } | |
5515 | else | |
5516 | { | |
5517 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5518 | ||
5519 | if (p->p_type == PT_PHDR) | |
5520 | relocation = phdr_memaddr - p->p_vaddr; | |
5521 | } | |
5522 | ||
5523 | if (relocation == -1) | |
5524 | { | |
e237a7e2 JK |
5525 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
5526 | any real world executables, including PIE executables, have always | |
5527 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
5528 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
5529 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
5530 | ||
5531 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
5532 | ||
5533 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
5534 | ||
2268b414 JK |
5535 | return 0; |
5536 | } | |
5537 | ||
5538 | for (i = 0; i < num_phdr; i++) | |
5539 | { | |
5540 | if (is_elf64) | |
5541 | { | |
5542 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5543 | ||
5544 | if (p->p_type == PT_DYNAMIC) | |
5545 | return p->p_vaddr + relocation; | |
5546 | } | |
5547 | else | |
5548 | { | |
5549 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5550 | ||
5551 | if (p->p_type == PT_DYNAMIC) | |
5552 | return p->p_vaddr + relocation; | |
5553 | } | |
5554 | } | |
5555 | ||
5556 | return 0; | |
5557 | } | |
5558 | ||
5559 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
5560 | can be 0 if the inferior does not yet have the library list initialized. |
5561 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
5562 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
5563 | |
5564 | static CORE_ADDR | |
5565 | get_r_debug (const int pid, const int is_elf64) | |
5566 | { | |
5567 | CORE_ADDR dynamic_memaddr; | |
5568 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5569 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 5570 | CORE_ADDR map = -1; |
2268b414 JK |
5571 | |
5572 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5573 | if (dynamic_memaddr == 0) | |
367ba2c2 | 5574 | return map; |
2268b414 JK |
5575 | |
5576 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5577 | { | |
5578 | if (is_elf64) | |
5579 | { | |
5580 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
75f62ce7 | 5581 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5582 | union |
5583 | { | |
5584 | Elf64_Xword map; | |
5585 | unsigned char buf[sizeof (Elf64_Xword)]; | |
5586 | } | |
5587 | rld_map; | |
5588 | ||
5589 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5590 | { | |
5591 | if (linux_read_memory (dyn->d_un.d_val, | |
5592 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5593 | return rld_map.map; | |
5594 | else | |
5595 | break; | |
5596 | } | |
75f62ce7 | 5597 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5598 | |
367ba2c2 MR |
5599 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5600 | map = dyn->d_un.d_val; | |
2268b414 JK |
5601 | |
5602 | if (dyn->d_tag == DT_NULL) | |
5603 | break; | |
5604 | } | |
5605 | else | |
5606 | { | |
5607 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
75f62ce7 | 5608 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5609 | union |
5610 | { | |
5611 | Elf32_Word map; | |
5612 | unsigned char buf[sizeof (Elf32_Word)]; | |
5613 | } | |
5614 | rld_map; | |
5615 | ||
5616 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5617 | { | |
5618 | if (linux_read_memory (dyn->d_un.d_val, | |
5619 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5620 | return rld_map.map; | |
5621 | else | |
5622 | break; | |
5623 | } | |
75f62ce7 | 5624 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5625 | |
367ba2c2 MR |
5626 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5627 | map = dyn->d_un.d_val; | |
2268b414 JK |
5628 | |
5629 | if (dyn->d_tag == DT_NULL) | |
5630 | break; | |
5631 | } | |
5632 | ||
5633 | dynamic_memaddr += dyn_size; | |
5634 | } | |
5635 | ||
367ba2c2 | 5636 | return map; |
2268b414 JK |
5637 | } |
5638 | ||
5639 | /* Read one pointer from MEMADDR in the inferior. */ | |
5640 | ||
5641 | static int | |
5642 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5643 | { | |
485f1ee4 PA |
5644 | int ret; |
5645 | ||
5646 | /* Go through a union so this works on either big or little endian | |
5647 | hosts, when the inferior's pointer size is smaller than the size | |
5648 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
5649 | same of the superior's. */ | |
5650 | union | |
5651 | { | |
5652 | CORE_ADDR core_addr; | |
5653 | unsigned int ui; | |
5654 | unsigned char uc; | |
5655 | } addr; | |
5656 | ||
5657 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
5658 | if (ret == 0) | |
5659 | { | |
5660 | if (ptr_size == sizeof (CORE_ADDR)) | |
5661 | *ptr = addr.core_addr; | |
5662 | else if (ptr_size == sizeof (unsigned int)) | |
5663 | *ptr = addr.ui; | |
5664 | else | |
5665 | gdb_assert_not_reached ("unhandled pointer size"); | |
5666 | } | |
5667 | return ret; | |
2268b414 JK |
5668 | } |
5669 | ||
5670 | struct link_map_offsets | |
5671 | { | |
5672 | /* Offset and size of r_debug.r_version. */ | |
5673 | int r_version_offset; | |
5674 | ||
5675 | /* Offset and size of r_debug.r_map. */ | |
5676 | int r_map_offset; | |
5677 | ||
5678 | /* Offset to l_addr field in struct link_map. */ | |
5679 | int l_addr_offset; | |
5680 | ||
5681 | /* Offset to l_name field in struct link_map. */ | |
5682 | int l_name_offset; | |
5683 | ||
5684 | /* Offset to l_ld field in struct link_map. */ | |
5685 | int l_ld_offset; | |
5686 | ||
5687 | /* Offset to l_next field in struct link_map. */ | |
5688 | int l_next_offset; | |
5689 | ||
5690 | /* Offset to l_prev field in struct link_map. */ | |
5691 | int l_prev_offset; | |
5692 | }; | |
5693 | ||
fb723180 | 5694 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
5695 | |
5696 | static int | |
5697 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5698 | unsigned const char *writebuf, | |
5699 | CORE_ADDR offset, int len) | |
5700 | { | |
5701 | char *document; | |
5702 | unsigned document_len; | |
5703 | struct process_info_private *const priv = current_process ()->private; | |
5704 | char filename[PATH_MAX]; | |
5705 | int pid, is_elf64; | |
5706 | ||
5707 | static const struct link_map_offsets lmo_32bit_offsets = | |
5708 | { | |
5709 | 0, /* r_version offset. */ | |
5710 | 4, /* r_debug.r_map offset. */ | |
5711 | 0, /* l_addr offset in link_map. */ | |
5712 | 4, /* l_name offset in link_map. */ | |
5713 | 8, /* l_ld offset in link_map. */ | |
5714 | 12, /* l_next offset in link_map. */ | |
5715 | 16 /* l_prev offset in link_map. */ | |
5716 | }; | |
5717 | ||
5718 | static const struct link_map_offsets lmo_64bit_offsets = | |
5719 | { | |
5720 | 0, /* r_version offset. */ | |
5721 | 8, /* r_debug.r_map offset. */ | |
5722 | 0, /* l_addr offset in link_map. */ | |
5723 | 8, /* l_name offset in link_map. */ | |
5724 | 16, /* l_ld offset in link_map. */ | |
5725 | 24, /* l_next offset in link_map. */ | |
5726 | 32 /* l_prev offset in link_map. */ | |
5727 | }; | |
5728 | const struct link_map_offsets *lmo; | |
214d508e | 5729 | unsigned int machine; |
b1fbec62 GB |
5730 | int ptr_size; |
5731 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
5732 | int allocated = 1024; | |
5733 | char *p; | |
5734 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
5735 | int header_done = 0; | |
2268b414 JK |
5736 | |
5737 | if (writebuf != NULL) | |
5738 | return -2; | |
5739 | if (readbuf == NULL) | |
5740 | return -1; | |
5741 | ||
d86d4aaf | 5742 | pid = lwpid_of (current_inferior); |
2268b414 | 5743 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 5744 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 5745 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 5746 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 5747 | |
b1fbec62 GB |
5748 | while (annex[0] != '\0') |
5749 | { | |
5750 | const char *sep; | |
5751 | CORE_ADDR *addrp; | |
5752 | int len; | |
2268b414 | 5753 | |
b1fbec62 GB |
5754 | sep = strchr (annex, '='); |
5755 | if (sep == NULL) | |
5756 | break; | |
0c5bf5a9 | 5757 | |
b1fbec62 GB |
5758 | len = sep - annex; |
5759 | if (len == 5 && strncmp (annex, "start", 5) == 0) | |
5760 | addrp = &lm_addr; | |
5761 | else if (len == 4 && strncmp (annex, "prev", 4) == 0) | |
5762 | addrp = &lm_prev; | |
5763 | else | |
5764 | { | |
5765 | annex = strchr (sep, ';'); | |
5766 | if (annex == NULL) | |
5767 | break; | |
5768 | annex++; | |
5769 | continue; | |
5770 | } | |
5771 | ||
5772 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 5773 | } |
b1fbec62 GB |
5774 | |
5775 | if (lm_addr == 0) | |
2268b414 | 5776 | { |
b1fbec62 GB |
5777 | int r_version = 0; |
5778 | ||
5779 | if (priv->r_debug == 0) | |
5780 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5781 | ||
5782 | /* We failed to find DT_DEBUG. Such situation will not change | |
5783 | for this inferior - do not retry it. Report it to GDB as | |
5784 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
5785 | if (priv->r_debug == (CORE_ADDR) -1) | |
5786 | return -1; | |
5787 | ||
5788 | if (priv->r_debug != 0) | |
2268b414 | 5789 | { |
b1fbec62 GB |
5790 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
5791 | (unsigned char *) &r_version, | |
5792 | sizeof (r_version)) != 0 | |
5793 | || r_version != 1) | |
5794 | { | |
5795 | warning ("unexpected r_debug version %d", r_version); | |
5796 | } | |
5797 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5798 | &lm_addr, ptr_size) != 0) | |
5799 | { | |
5800 | warning ("unable to read r_map from 0x%lx", | |
5801 | (long) priv->r_debug + lmo->r_map_offset); | |
5802 | } | |
2268b414 | 5803 | } |
b1fbec62 | 5804 | } |
2268b414 | 5805 | |
b1fbec62 GB |
5806 | document = xmalloc (allocated); |
5807 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
5808 | p = document + strlen (document); | |
5809 | ||
5810 | while (lm_addr | |
5811 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
5812 | &l_name, ptr_size) == 0 | |
5813 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
5814 | &l_addr, ptr_size) == 0 | |
5815 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
5816 | &l_ld, ptr_size) == 0 | |
5817 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
5818 | &l_prev, ptr_size) == 0 | |
5819 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
5820 | &l_next, ptr_size) == 0) | |
5821 | { | |
5822 | unsigned char libname[PATH_MAX]; | |
5823 | ||
5824 | if (lm_prev != l_prev) | |
2268b414 | 5825 | { |
b1fbec62 GB |
5826 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
5827 | (long) lm_prev, (long) l_prev); | |
5828 | break; | |
2268b414 JK |
5829 | } |
5830 | ||
d878444c JK |
5831 | /* Ignore the first entry even if it has valid name as the first entry |
5832 | corresponds to the main executable. The first entry should not be | |
5833 | skipped if the dynamic loader was loaded late by a static executable | |
5834 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
5835 | executable does not have PT_DYNAMIC present and this function already | |
5836 | exited above due to failed get_r_debug. */ | |
5837 | if (lm_prev == 0) | |
2268b414 | 5838 | { |
d878444c JK |
5839 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
5840 | p = p + strlen (p); | |
5841 | } | |
5842 | else | |
5843 | { | |
5844 | /* Not checking for error because reading may stop before | |
5845 | we've got PATH_MAX worth of characters. */ | |
5846 | libname[0] = '\0'; | |
5847 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
5848 | libname[sizeof (libname) - 1] = '\0'; | |
5849 | if (libname[0] != '\0') | |
2268b414 | 5850 | { |
d878444c JK |
5851 | /* 6x the size for xml_escape_text below. */ |
5852 | size_t len = 6 * strlen ((char *) libname); | |
5853 | char *name; | |
2268b414 | 5854 | |
d878444c JK |
5855 | if (!header_done) |
5856 | { | |
5857 | /* Terminate `<library-list-svr4'. */ | |
5858 | *p++ = '>'; | |
5859 | header_done = 1; | |
5860 | } | |
2268b414 | 5861 | |
d878444c JK |
5862 | while (allocated < p - document + len + 200) |
5863 | { | |
5864 | /* Expand to guarantee sufficient storage. */ | |
5865 | uintptr_t document_len = p - document; | |
2268b414 | 5866 | |
d878444c JK |
5867 | document = xrealloc (document, 2 * allocated); |
5868 | allocated *= 2; | |
5869 | p = document + document_len; | |
5870 | } | |
5871 | ||
5872 | name = xml_escape_text ((char *) libname); | |
5873 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
5874 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
5875 | name, (unsigned long) lm_addr, | |
5876 | (unsigned long) l_addr, (unsigned long) l_ld); | |
5877 | free (name); | |
5878 | } | |
0afae3cf | 5879 | } |
b1fbec62 GB |
5880 | |
5881 | lm_prev = lm_addr; | |
5882 | lm_addr = l_next; | |
2268b414 JK |
5883 | } |
5884 | ||
b1fbec62 GB |
5885 | if (!header_done) |
5886 | { | |
5887 | /* Empty list; terminate `<library-list-svr4'. */ | |
5888 | strcpy (p, "/>"); | |
5889 | } | |
5890 | else | |
5891 | strcpy (p, "</library-list-svr4>"); | |
5892 | ||
2268b414 JK |
5893 | document_len = strlen (document); |
5894 | if (offset < document_len) | |
5895 | document_len -= offset; | |
5896 | else | |
5897 | document_len = 0; | |
5898 | if (len > document_len) | |
5899 | len = document_len; | |
5900 | ||
5901 | memcpy (readbuf, document + offset, len); | |
5902 | xfree (document); | |
5903 | ||
5904 | return len; | |
5905 | } | |
5906 | ||
9accd112 MM |
5907 | #ifdef HAVE_LINUX_BTRACE |
5908 | ||
969c39fb | 5909 | /* See to_enable_btrace target method. */ |
9accd112 MM |
5910 | |
5911 | static struct btrace_target_info * | |
5912 | linux_low_enable_btrace (ptid_t ptid) | |
5913 | { | |
5914 | struct btrace_target_info *tinfo; | |
5915 | ||
5916 | tinfo = linux_enable_btrace (ptid); | |
3aee8918 | 5917 | |
9accd112 | 5918 | if (tinfo != NULL) |
3aee8918 PA |
5919 | { |
5920 | struct thread_info *thread = find_thread_ptid (ptid); | |
5921 | struct regcache *regcache = get_thread_regcache (thread, 0); | |
5922 | ||
5923 | tinfo->ptr_bits = register_size (regcache->tdesc, 0) * 8; | |
5924 | } | |
9accd112 MM |
5925 | |
5926 | return tinfo; | |
5927 | } | |
5928 | ||
969c39fb | 5929 | /* See to_disable_btrace target method. */ |
9accd112 | 5930 | |
969c39fb MM |
5931 | static int |
5932 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
5933 | { | |
5934 | enum btrace_error err; | |
5935 | ||
5936 | err = linux_disable_btrace (tinfo); | |
5937 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
5938 | } | |
5939 | ||
5940 | /* See to_read_btrace target method. */ | |
5941 | ||
5942 | static int | |
9accd112 MM |
5943 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
5944 | int type) | |
5945 | { | |
5946 | VEC (btrace_block_s) *btrace; | |
5947 | struct btrace_block *block; | |
969c39fb | 5948 | enum btrace_error err; |
9accd112 MM |
5949 | int i; |
5950 | ||
969c39fb MM |
5951 | btrace = NULL; |
5952 | err = linux_read_btrace (&btrace, tinfo, type); | |
5953 | if (err != BTRACE_ERR_NONE) | |
5954 | { | |
5955 | if (err == BTRACE_ERR_OVERFLOW) | |
5956 | buffer_grow_str0 (buffer, "E.Overflow."); | |
5957 | else | |
5958 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
5959 | ||
5960 | return -1; | |
5961 | } | |
9accd112 MM |
5962 | |
5963 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
5964 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
5965 | ||
5966 | for (i = 0; VEC_iterate (btrace_block_s, btrace, i, block); i++) | |
5967 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
5968 | paddress (block->begin), paddress (block->end)); | |
5969 | ||
969c39fb | 5970 | buffer_grow_str0 (buffer, "</btrace>\n"); |
9accd112 MM |
5971 | |
5972 | VEC_free (btrace_block_s, btrace); | |
969c39fb MM |
5973 | |
5974 | return 0; | |
9accd112 MM |
5975 | } |
5976 | #endif /* HAVE_LINUX_BTRACE */ | |
5977 | ||
ce3a066d DJ |
5978 | static struct target_ops linux_target_ops = { |
5979 | linux_create_inferior, | |
5980 | linux_attach, | |
5981 | linux_kill, | |
6ad8ae5c | 5982 | linux_detach, |
8336d594 | 5983 | linux_mourn, |
444d6139 | 5984 | linux_join, |
ce3a066d DJ |
5985 | linux_thread_alive, |
5986 | linux_resume, | |
5987 | linux_wait, | |
5988 | linux_fetch_registers, | |
5989 | linux_store_registers, | |
90d74c30 | 5990 | linux_prepare_to_access_memory, |
0146f85b | 5991 | linux_done_accessing_memory, |
ce3a066d DJ |
5992 | linux_read_memory, |
5993 | linux_write_memory, | |
2f2893d9 | 5994 | linux_look_up_symbols, |
ef57601b | 5995 | linux_request_interrupt, |
aa691b87 | 5996 | linux_read_auxv, |
d993e290 PA |
5997 | linux_insert_point, |
5998 | linux_remove_point, | |
e013ee27 OF |
5999 | linux_stopped_by_watchpoint, |
6000 | linux_stopped_data_address, | |
db0dfaa0 LM |
6001 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
6002 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
6003 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 6004 | linux_read_offsets, |
dae5f5cf DJ |
6005 | #else |
6006 | NULL, | |
6007 | #endif | |
6008 | #ifdef USE_THREAD_DB | |
6009 | thread_db_get_tls_address, | |
6010 | #else | |
6011 | NULL, | |
52fb6437 | 6012 | #endif |
efcbbd14 | 6013 | linux_qxfer_spu, |
59a016f0 | 6014 | hostio_last_error_from_errno, |
07e059b5 | 6015 | linux_qxfer_osdata, |
4aa995e1 | 6016 | linux_xfer_siginfo, |
bd99dc85 PA |
6017 | linux_supports_non_stop, |
6018 | linux_async, | |
6019 | linux_start_non_stop, | |
cdbfd419 PP |
6020 | linux_supports_multi_process, |
6021 | #ifdef USE_THREAD_DB | |
dc146f7c | 6022 | thread_db_handle_monitor_command, |
cdbfd419 | 6023 | #else |
dc146f7c | 6024 | NULL, |
cdbfd419 | 6025 | #endif |
d26e3629 | 6026 | linux_common_core_of_thread, |
78d85199 | 6027 | linux_read_loadmap, |
219f2f23 PA |
6028 | linux_process_qsupported, |
6029 | linux_supports_tracepoints, | |
6030 | linux_read_pc, | |
8336d594 PA |
6031 | linux_write_pc, |
6032 | linux_thread_stopped, | |
7984d532 | 6033 | NULL, |
711e434b | 6034 | linux_pause_all, |
7984d532 | 6035 | linux_unpause_all, |
fa593d66 PA |
6036 | linux_cancel_breakpoints, |
6037 | linux_stabilize_threads, | |
6a271cae | 6038 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
6039 | linux_emit_ops, |
6040 | linux_supports_disable_randomization, | |
405f8e94 | 6041 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 6042 | linux_qxfer_libraries_svr4, |
d1feda86 | 6043 | linux_supports_agent, |
9accd112 MM |
6044 | #ifdef HAVE_LINUX_BTRACE |
6045 | linux_supports_btrace, | |
6046 | linux_low_enable_btrace, | |
969c39fb | 6047 | linux_low_disable_btrace, |
9accd112 MM |
6048 | linux_low_read_btrace, |
6049 | #else | |
6050 | NULL, | |
6051 | NULL, | |
6052 | NULL, | |
6053 | NULL, | |
9accd112 | 6054 | #endif |
c2d6af84 | 6055 | linux_supports_range_stepping, |
ce3a066d DJ |
6056 | }; |
6057 | ||
0d62e5e8 DJ |
6058 | static void |
6059 | linux_init_signals () | |
6060 | { | |
6061 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
6062 | to find what the cancel signal actually is. */ | |
1a981360 | 6063 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 6064 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 6065 | #endif |
0d62e5e8 DJ |
6066 | } |
6067 | ||
3aee8918 PA |
6068 | #ifdef HAVE_LINUX_REGSETS |
6069 | void | |
6070 | initialize_regsets_info (struct regsets_info *info) | |
6071 | { | |
6072 | for (info->num_regsets = 0; | |
6073 | info->regsets[info->num_regsets].size >= 0; | |
6074 | info->num_regsets++) | |
6075 | ; | |
3aee8918 PA |
6076 | } |
6077 | #endif | |
6078 | ||
da6d8c04 DJ |
6079 | void |
6080 | initialize_low (void) | |
6081 | { | |
bd99dc85 PA |
6082 | struct sigaction sigchld_action; |
6083 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 6084 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
6085 | set_breakpoint_data (the_low_target.breakpoint, |
6086 | the_low_target.breakpoint_len); | |
0d62e5e8 | 6087 | linux_init_signals (); |
aa7c7447 | 6088 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
6089 | |
6090 | sigchld_action.sa_handler = sigchld_handler; | |
6091 | sigemptyset (&sigchld_action.sa_mask); | |
6092 | sigchld_action.sa_flags = SA_RESTART; | |
6093 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
6094 | |
6095 | initialize_low_arch (); | |
da6d8c04 | 6096 | } |