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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
32d0add0 | 2 | Copyright (C) 1995-2015 Free Software Foundation, Inc. |
da6d8c04 DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
da6d8c04 DJ |
9 | (at your option) any later version. |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
da6d8c04 DJ |
18 | |
19 | #include "server.h" | |
58caa3dc | 20 | #include "linux-low.h" |
125f8a3d | 21 | #include "nat/linux-osdata.h" |
58b4daa5 | 22 | #include "agent.h" |
da6d8c04 | 23 | |
96d7229d LM |
24 | #include "nat/linux-nat.h" |
25 | #include "nat/linux-waitpid.h" | |
8bdce1ff | 26 | #include "gdb_wait.h" |
da6d8c04 | 27 | #include <sys/ptrace.h> |
125f8a3d GB |
28 | #include "nat/linux-ptrace.h" |
29 | #include "nat/linux-procfs.h" | |
da6d8c04 DJ |
30 | #include <signal.h> |
31 | #include <sys/ioctl.h> | |
32 | #include <fcntl.h> | |
0a30fbc4 | 33 | #include <unistd.h> |
fd500816 | 34 | #include <sys/syscall.h> |
f9387fc3 | 35 | #include <sched.h> |
07e059b5 VP |
36 | #include <ctype.h> |
37 | #include <pwd.h> | |
38 | #include <sys/types.h> | |
39 | #include <dirent.h> | |
53ce3c39 | 40 | #include <sys/stat.h> |
efcbbd14 | 41 | #include <sys/vfs.h> |
1570b33e | 42 | #include <sys/uio.h> |
602e3198 | 43 | #include "filestuff.h" |
c144c7a0 | 44 | #include "tracepoint.h" |
533b0600 | 45 | #include "hostio.h" |
957f3f49 DE |
46 | #ifndef ELFMAG0 |
47 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
48 | then ELFMAG0 will have been defined. If it didn't get included by | |
49 | gdb_proc_service.h then including it will likely introduce a duplicate | |
50 | definition of elf_fpregset_t. */ | |
51 | #include <elf.h> | |
52 | #endif | |
efcbbd14 UW |
53 | |
54 | #ifndef SPUFS_MAGIC | |
55 | #define SPUFS_MAGIC 0x23c9b64e | |
56 | #endif | |
da6d8c04 | 57 | |
03583c20 UW |
58 | #ifdef HAVE_PERSONALITY |
59 | # include <sys/personality.h> | |
60 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
61 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
62 | # endif | |
63 | #endif | |
64 | ||
fd462a61 DJ |
65 | #ifndef O_LARGEFILE |
66 | #define O_LARGEFILE 0 | |
67 | #endif | |
68 | ||
ec8ebe72 DE |
69 | #ifndef W_STOPCODE |
70 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
71 | #endif | |
72 | ||
1a981360 PA |
73 | /* This is the kernel's hard limit. Not to be confused with |
74 | SIGRTMIN. */ | |
75 | #ifndef __SIGRTMIN | |
76 | #define __SIGRTMIN 32 | |
77 | #endif | |
78 | ||
db0dfaa0 LM |
79 | /* Some targets did not define these ptrace constants from the start, |
80 | so gdbserver defines them locally here. In the future, these may | |
81 | be removed after they are added to asm/ptrace.h. */ | |
82 | #if !(defined(PT_TEXT_ADDR) \ | |
83 | || defined(PT_DATA_ADDR) \ | |
84 | || defined(PT_TEXT_END_ADDR)) | |
85 | #if defined(__mcoldfire__) | |
86 | /* These are still undefined in 3.10 kernels. */ | |
87 | #define PT_TEXT_ADDR 49*4 | |
88 | #define PT_DATA_ADDR 50*4 | |
89 | #define PT_TEXT_END_ADDR 51*4 | |
90 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
91 | #elif defined(BFIN) | |
92 | #define PT_TEXT_ADDR 220 | |
93 | #define PT_TEXT_END_ADDR 224 | |
94 | #define PT_DATA_ADDR 228 | |
95 | /* These are still undefined in 3.10 kernels. */ | |
96 | #elif defined(__TMS320C6X__) | |
97 | #define PT_TEXT_ADDR (0x10000*4) | |
98 | #define PT_DATA_ADDR (0x10004*4) | |
99 | #define PT_TEXT_END_ADDR (0x10008*4) | |
100 | #endif | |
101 | #endif | |
102 | ||
9accd112 | 103 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 104 | # include "nat/linux-btrace.h" |
9accd112 MM |
105 | #endif |
106 | ||
8365dcf5 TJB |
107 | #ifndef HAVE_ELF32_AUXV_T |
108 | /* Copied from glibc's elf.h. */ | |
109 | typedef struct | |
110 | { | |
111 | uint32_t a_type; /* Entry type */ | |
112 | union | |
113 | { | |
114 | uint32_t a_val; /* Integer value */ | |
115 | /* We use to have pointer elements added here. We cannot do that, | |
116 | though, since it does not work when using 32-bit definitions | |
117 | on 64-bit platforms and vice versa. */ | |
118 | } a_un; | |
119 | } Elf32_auxv_t; | |
120 | #endif | |
121 | ||
122 | #ifndef HAVE_ELF64_AUXV_T | |
123 | /* Copied from glibc's elf.h. */ | |
124 | typedef struct | |
125 | { | |
126 | uint64_t a_type; /* Entry type */ | |
127 | union | |
128 | { | |
129 | uint64_t a_val; /* Integer value */ | |
130 | /* We use to have pointer elements added here. We cannot do that, | |
131 | though, since it does not work when using 32-bit definitions | |
132 | on 64-bit platforms and vice versa. */ | |
133 | } a_un; | |
134 | } Elf64_auxv_t; | |
135 | #endif | |
136 | ||
05044653 PA |
137 | /* A list of all unknown processes which receive stop signals. Some |
138 | other process will presumably claim each of these as forked | |
139 | children momentarily. */ | |
24a09b5f | 140 | |
05044653 PA |
141 | struct simple_pid_list |
142 | { | |
143 | /* The process ID. */ | |
144 | int pid; | |
145 | ||
146 | /* The status as reported by waitpid. */ | |
147 | int status; | |
148 | ||
149 | /* Next in chain. */ | |
150 | struct simple_pid_list *next; | |
151 | }; | |
152 | struct simple_pid_list *stopped_pids; | |
153 | ||
154 | /* Trivial list manipulation functions to keep track of a list of new | |
155 | stopped processes. */ | |
156 | ||
157 | static void | |
158 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
159 | { | |
160 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
161 | ||
162 | new_pid->pid = pid; | |
163 | new_pid->status = status; | |
164 | new_pid->next = *listp; | |
165 | *listp = new_pid; | |
166 | } | |
167 | ||
168 | static int | |
169 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
170 | { | |
171 | struct simple_pid_list **p; | |
172 | ||
173 | for (p = listp; *p != NULL; p = &(*p)->next) | |
174 | if ((*p)->pid == pid) | |
175 | { | |
176 | struct simple_pid_list *next = (*p)->next; | |
177 | ||
178 | *statusp = (*p)->status; | |
179 | xfree (*p); | |
180 | *p = next; | |
181 | return 1; | |
182 | } | |
183 | return 0; | |
184 | } | |
24a09b5f | 185 | |
bde24c0a PA |
186 | enum stopping_threads_kind |
187 | { | |
188 | /* Not stopping threads presently. */ | |
189 | NOT_STOPPING_THREADS, | |
190 | ||
191 | /* Stopping threads. */ | |
192 | STOPPING_THREADS, | |
193 | ||
194 | /* Stopping and suspending threads. */ | |
195 | STOPPING_AND_SUSPENDING_THREADS | |
196 | }; | |
197 | ||
198 | /* This is set while stop_all_lwps is in effect. */ | |
199 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
200 | |
201 | /* FIXME make into a target method? */ | |
24a09b5f | 202 | int using_threads = 1; |
24a09b5f | 203 | |
fa593d66 PA |
204 | /* True if we're presently stabilizing threads (moving them out of |
205 | jump pads). */ | |
206 | static int stabilizing_threads; | |
207 | ||
2acc282a | 208 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 209 | int step, int signal, siginfo_t *info); |
2bd7c093 | 210 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
211 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
212 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
fa96cb38 PA |
213 | static int linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
214 | int *wstat, int options); | |
95954743 | 215 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
b3312d80 | 216 | static struct lwp_info *add_lwp (ptid_t ptid); |
c35fafde | 217 | static int linux_stopped_by_watchpoint (void); |
95954743 | 218 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 219 | static void proceed_all_lwps (void); |
d50171e4 PA |
220 | static int finish_step_over (struct lwp_info *lwp); |
221 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
222 | static int kill_lwp (unsigned long lwpid, int signo); | |
223 | ||
224 | /* True if the low target can hardware single-step. Such targets | |
225 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
226 | ||
227 | static int | |
228 | can_hardware_single_step (void) | |
229 | { | |
230 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
231 | } | |
232 | ||
233 | /* True if the low target supports memory breakpoints. If so, we'll | |
234 | have a GET_PC implementation. */ | |
235 | ||
236 | static int | |
237 | supports_breakpoints (void) | |
238 | { | |
239 | return (the_low_target.get_pc != NULL); | |
240 | } | |
0d62e5e8 | 241 | |
fa593d66 PA |
242 | /* Returns true if this target can support fast tracepoints. This |
243 | does not mean that the in-process agent has been loaded in the | |
244 | inferior. */ | |
245 | ||
246 | static int | |
247 | supports_fast_tracepoints (void) | |
248 | { | |
249 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
250 | } | |
251 | ||
c2d6af84 PA |
252 | /* True if LWP is stopped in its stepping range. */ |
253 | ||
254 | static int | |
255 | lwp_in_step_range (struct lwp_info *lwp) | |
256 | { | |
257 | CORE_ADDR pc = lwp->stop_pc; | |
258 | ||
259 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
260 | } | |
261 | ||
0d62e5e8 DJ |
262 | struct pending_signals |
263 | { | |
264 | int signal; | |
32ca6d61 | 265 | siginfo_t info; |
0d62e5e8 DJ |
266 | struct pending_signals *prev; |
267 | }; | |
611cb4a5 | 268 | |
bd99dc85 PA |
269 | /* The read/write ends of the pipe registered as waitable file in the |
270 | event loop. */ | |
271 | static int linux_event_pipe[2] = { -1, -1 }; | |
272 | ||
273 | /* True if we're currently in async mode. */ | |
274 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
275 | ||
02fc4de7 | 276 | static void send_sigstop (struct lwp_info *lwp); |
fa96cb38 | 277 | static void wait_for_sigstop (void); |
bd99dc85 | 278 | |
d0722149 DE |
279 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
280 | ||
281 | static int | |
214d508e | 282 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 283 | { |
214d508e L |
284 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
285 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
286 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
287 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
288 | { | |
289 | *machine = header->e_machine; | |
290 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
291 | ||
292 | } | |
293 | *machine = EM_NONE; | |
294 | return -1; | |
d0722149 DE |
295 | } |
296 | ||
297 | /* Return non-zero if FILE is a 64-bit ELF file, | |
298 | zero if the file is not a 64-bit ELF file, | |
299 | and -1 if the file is not accessible or doesn't exist. */ | |
300 | ||
be07f1a2 | 301 | static int |
214d508e | 302 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 303 | { |
957f3f49 | 304 | Elf64_Ehdr header; |
d0722149 DE |
305 | int fd; |
306 | ||
307 | fd = open (file, O_RDONLY); | |
308 | if (fd < 0) | |
309 | return -1; | |
310 | ||
311 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
312 | { | |
313 | close (fd); | |
314 | return 0; | |
315 | } | |
316 | close (fd); | |
317 | ||
214d508e | 318 | return elf_64_header_p (&header, machine); |
d0722149 DE |
319 | } |
320 | ||
be07f1a2 PA |
321 | /* Accepts an integer PID; Returns true if the executable PID is |
322 | running is a 64-bit ELF file.. */ | |
323 | ||
324 | int | |
214d508e | 325 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 326 | { |
d8d2a3ee | 327 | char file[PATH_MAX]; |
be07f1a2 PA |
328 | |
329 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 330 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
331 | } |
332 | ||
bd99dc85 PA |
333 | static void |
334 | delete_lwp (struct lwp_info *lwp) | |
335 | { | |
fa96cb38 PA |
336 | struct thread_info *thr = get_lwp_thread (lwp); |
337 | ||
338 | if (debug_threads) | |
339 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
340 | ||
341 | remove_thread (thr); | |
aa5ca48f | 342 | free (lwp->arch_private); |
bd99dc85 PA |
343 | free (lwp); |
344 | } | |
345 | ||
95954743 PA |
346 | /* Add a process to the common process list, and set its private |
347 | data. */ | |
348 | ||
349 | static struct process_info * | |
350 | linux_add_process (int pid, int attached) | |
351 | { | |
352 | struct process_info *proc; | |
353 | ||
95954743 PA |
354 | proc = add_process (pid, attached); |
355 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
356 | ||
3aee8918 PA |
357 | /* Set the arch when the first LWP stops. */ |
358 | proc->private->new_inferior = 1; | |
359 | ||
aa5ca48f DE |
360 | if (the_low_target.new_process != NULL) |
361 | proc->private->arch_private = the_low_target.new_process (); | |
362 | ||
95954743 PA |
363 | return proc; |
364 | } | |
365 | ||
bd99dc85 PA |
366 | /* Handle a GNU/Linux extended wait response. If we see a clone |
367 | event, we need to add the new LWP to our list (and not report the | |
368 | trap to higher layers). */ | |
0d62e5e8 | 369 | |
24a09b5f | 370 | static void |
54a0b537 | 371 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f | 372 | { |
89a5711c | 373 | int event = linux_ptrace_get_extended_event (wstat); |
d86d4aaf | 374 | struct thread_info *event_thr = get_lwp_thread (event_child); |
54a0b537 | 375 | struct lwp_info *new_lwp; |
24a09b5f DJ |
376 | |
377 | if (event == PTRACE_EVENT_CLONE) | |
378 | { | |
95954743 | 379 | ptid_t ptid; |
24a09b5f | 380 | unsigned long new_pid; |
05044653 | 381 | int ret, status; |
24a09b5f | 382 | |
d86d4aaf | 383 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 384 | &new_pid); |
24a09b5f DJ |
385 | |
386 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 387 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
388 | { |
389 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
390 | hits the SIGSTOP, but we're already attached. */ | |
391 | ||
97438e3f | 392 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
393 | |
394 | if (ret == -1) | |
395 | perror_with_name ("waiting for new child"); | |
396 | else if (ret != new_pid) | |
397 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 398 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
399 | warning ("wait returned unexpected status 0x%x", status); |
400 | } | |
401 | ||
fa96cb38 PA |
402 | if (debug_threads) |
403 | debug_printf ("HEW: Got clone event " | |
404 | "from LWP %ld, new child is LWP %ld\n", | |
405 | lwpid_of (event_thr), new_pid); | |
406 | ||
d86d4aaf | 407 | ptid = ptid_build (pid_of (event_thr), new_pid, 0); |
b3312d80 | 408 | new_lwp = add_lwp (ptid); |
24a09b5f | 409 | |
e27d73f6 DE |
410 | /* Either we're going to immediately resume the new thread |
411 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
412 | thinks the thread is currently running, so set this first | |
413 | before calling linux_resume_one_lwp. */ | |
414 | new_lwp->stopped = 1; | |
415 | ||
bde24c0a PA |
416 | /* If we're suspending all threads, leave this one suspended |
417 | too. */ | |
418 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
419 | new_lwp->suspended = 1; | |
420 | ||
da5898ce DJ |
421 | /* Normally we will get the pending SIGSTOP. But in some cases |
422 | we might get another signal delivered to the group first. | |
f21cc1a2 | 423 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
424 | if (WSTOPSIG (status) == SIGSTOP) |
425 | { | |
bde24c0a | 426 | if (stopping_threads != NOT_STOPPING_THREADS) |
d50171e4 PA |
427 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
428 | else | |
e27d73f6 | 429 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 430 | } |
24a09b5f | 431 | else |
da5898ce | 432 | { |
54a0b537 | 433 | new_lwp->stop_expected = 1; |
d50171e4 | 434 | |
bde24c0a | 435 | if (stopping_threads != NOT_STOPPING_THREADS) |
da5898ce | 436 | { |
d50171e4 | 437 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
438 | new_lwp->status_pending_p = 1; |
439 | new_lwp->status_pending = status; | |
da5898ce DJ |
440 | } |
441 | else | |
442 | /* Pass the signal on. This is what GDB does - except | |
443 | shouldn't we really report it instead? */ | |
e27d73f6 | 444 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 445 | } |
24a09b5f DJ |
446 | |
447 | /* Always resume the current thread. If we are stopping | |
448 | threads, it will have a pending SIGSTOP; we may as well | |
449 | collect it now. */ | |
2acc282a | 450 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
451 | } |
452 | } | |
453 | ||
d50171e4 PA |
454 | /* Return the PC as read from the regcache of LWP, without any |
455 | adjustment. */ | |
456 | ||
457 | static CORE_ADDR | |
458 | get_pc (struct lwp_info *lwp) | |
459 | { | |
0bfdf32f | 460 | struct thread_info *saved_thread; |
d50171e4 PA |
461 | struct regcache *regcache; |
462 | CORE_ADDR pc; | |
463 | ||
464 | if (the_low_target.get_pc == NULL) | |
465 | return 0; | |
466 | ||
0bfdf32f GB |
467 | saved_thread = current_thread; |
468 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 469 | |
0bfdf32f | 470 | regcache = get_thread_regcache (current_thread, 1); |
d50171e4 PA |
471 | pc = (*the_low_target.get_pc) (regcache); |
472 | ||
473 | if (debug_threads) | |
87ce2a04 | 474 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 475 | |
0bfdf32f | 476 | current_thread = saved_thread; |
d50171e4 PA |
477 | return pc; |
478 | } | |
479 | ||
480 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
481 | The SIGTRAP could mean several things. |
482 | ||
483 | On i386, where decr_pc_after_break is non-zero: | |
484 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
485 | we will get only the one SIGTRAP (even if the instruction we | |
486 | stepped over was a breakpoint). The value of $eip will be the | |
487 | next instruction. | |
488 | If we continue the process using PTRACE_CONT, we will get a | |
489 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
490 | the instruction after the breakpoint (i.e. needs to be | |
491 | decremented). If we report the SIGTRAP to GDB, we must also | |
492 | report the undecremented PC. If we cancel the SIGTRAP, we | |
493 | must resume at the decremented PC. | |
494 | ||
495 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
496 | with hardware or kernel single-step: | |
497 | If we single-step over a breakpoint instruction, our PC will | |
498 | point at the following instruction. If we continue and hit a | |
499 | breakpoint instruction, our PC will point at the breakpoint | |
500 | instruction. */ | |
501 | ||
502 | static CORE_ADDR | |
d50171e4 | 503 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 504 | { |
d50171e4 PA |
505 | CORE_ADDR stop_pc; |
506 | ||
507 | if (the_low_target.get_pc == NULL) | |
508 | return 0; | |
0d62e5e8 | 509 | |
d50171e4 PA |
510 | stop_pc = get_pc (lwp); |
511 | ||
bdabb078 PA |
512 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
513 | && !lwp->stepping | |
514 | && !lwp->stopped_by_watchpoint | |
89a5711c | 515 | && !linux_is_extended_waitstatus (lwp->last_status)) |
47c0c975 DE |
516 | stop_pc -= the_low_target.decr_pc_after_break; |
517 | ||
518 | if (debug_threads) | |
87ce2a04 | 519 | debug_printf ("stop pc is 0x%lx\n", (long) stop_pc); |
47c0c975 DE |
520 | |
521 | return stop_pc; | |
0d62e5e8 | 522 | } |
ce3a066d | 523 | |
b3312d80 | 524 | static struct lwp_info * |
95954743 | 525 | add_lwp (ptid_t ptid) |
611cb4a5 | 526 | { |
54a0b537 | 527 | struct lwp_info *lwp; |
0d62e5e8 | 528 | |
54a0b537 PA |
529 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
530 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 531 | |
aa5ca48f DE |
532 | if (the_low_target.new_thread != NULL) |
533 | lwp->arch_private = the_low_target.new_thread (); | |
534 | ||
f7667f0d | 535 | lwp->thread = add_thread (ptid, lwp); |
0d62e5e8 | 536 | |
54a0b537 | 537 | return lwp; |
0d62e5e8 | 538 | } |
611cb4a5 | 539 | |
da6d8c04 DJ |
540 | /* Start an inferior process and returns its pid. |
541 | ALLARGS is a vector of program-name and args. */ | |
542 | ||
ce3a066d DJ |
543 | static int |
544 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 545 | { |
03583c20 UW |
546 | #ifdef HAVE_PERSONALITY |
547 | int personality_orig = 0, personality_set = 0; | |
548 | #endif | |
a6dbe5df | 549 | struct lwp_info *new_lwp; |
da6d8c04 | 550 | int pid; |
95954743 | 551 | ptid_t ptid; |
da6d8c04 | 552 | |
03583c20 UW |
553 | #ifdef HAVE_PERSONALITY |
554 | if (disable_randomization) | |
555 | { | |
556 | errno = 0; | |
557 | personality_orig = personality (0xffffffff); | |
558 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
559 | { | |
560 | personality_set = 1; | |
561 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
562 | } | |
563 | if (errno != 0 || (personality_set | |
564 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
565 | warning ("Error disabling address space randomization: %s", | |
566 | strerror (errno)); | |
567 | } | |
568 | #endif | |
569 | ||
42c81e2a | 570 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
571 | pid = vfork (); |
572 | #else | |
da6d8c04 | 573 | pid = fork (); |
52fb6437 | 574 | #endif |
da6d8c04 DJ |
575 | if (pid < 0) |
576 | perror_with_name ("fork"); | |
577 | ||
578 | if (pid == 0) | |
579 | { | |
602e3198 | 580 | close_most_fds (); |
b8e1b30e | 581 | ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da6d8c04 | 582 | |
1a981360 | 583 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 584 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 585 | #endif |
0d62e5e8 | 586 | |
a9fa9f7d DJ |
587 | setpgid (0, 0); |
588 | ||
e0f9f062 DE |
589 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
590 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
591 | Also, redirect stdin to /dev/null. */ | |
592 | if (remote_connection_is_stdio ()) | |
593 | { | |
594 | close (0); | |
595 | open ("/dev/null", O_RDONLY); | |
596 | dup2 (2, 1); | |
3e52c33d JK |
597 | if (write (2, "stdin/stdout redirected\n", |
598 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
599 | { |
600 | /* Errors ignored. */; | |
601 | } | |
e0f9f062 DE |
602 | } |
603 | ||
2b876972 DJ |
604 | execv (program, allargs); |
605 | if (errno == ENOENT) | |
606 | execvp (program, allargs); | |
da6d8c04 DJ |
607 | |
608 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 609 | strerror (errno)); |
da6d8c04 DJ |
610 | fflush (stderr); |
611 | _exit (0177); | |
612 | } | |
613 | ||
03583c20 UW |
614 | #ifdef HAVE_PERSONALITY |
615 | if (personality_set) | |
616 | { | |
617 | errno = 0; | |
618 | personality (personality_orig); | |
619 | if (errno != 0) | |
620 | warning ("Error restoring address space randomization: %s", | |
621 | strerror (errno)); | |
622 | } | |
623 | #endif | |
624 | ||
95954743 PA |
625 | linux_add_process (pid, 0); |
626 | ||
627 | ptid = ptid_build (pid, pid, 0); | |
628 | new_lwp = add_lwp (ptid); | |
a6dbe5df | 629 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 630 | |
a9fa9f7d | 631 | return pid; |
da6d8c04 DJ |
632 | } |
633 | ||
8784d563 PA |
634 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
635 | error. */ | |
da6d8c04 | 636 | |
7ae1a6a6 PA |
637 | int |
638 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 639 | { |
54a0b537 | 640 | struct lwp_info *new_lwp; |
7ae1a6a6 | 641 | int lwpid = ptid_get_lwp (ptid); |
611cb4a5 | 642 | |
b8e1b30e | 643 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 644 | != 0) |
7ae1a6a6 | 645 | return errno; |
24a09b5f | 646 | |
b3312d80 | 647 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 648 | |
a6dbe5df PA |
649 | /* We need to wait for SIGSTOP before being able to make the next |
650 | ptrace call on this LWP. */ | |
651 | new_lwp->must_set_ptrace_flags = 1; | |
652 | ||
644cebc9 | 653 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
654 | { |
655 | if (debug_threads) | |
87ce2a04 | 656 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
657 | |
658 | /* The process is definitely stopped. It is in a job control | |
659 | stop, unless the kernel predates the TASK_STOPPED / | |
660 | TASK_TRACED distinction, in which case it might be in a | |
661 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
662 | can kill it, signal it, et cetera. | |
663 | ||
664 | First make sure there is a pending SIGSTOP. Since we are | |
665 | already attached, the process can not transition from stopped | |
666 | to running without a PTRACE_CONT; so we know this signal will | |
667 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
668 | probably already in the queue (unless this kernel is old | |
669 | enough to use TASK_STOPPED for ptrace stops); but since | |
670 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
671 | kill_lwp (lwpid, SIGSTOP); | |
672 | ||
673 | /* Finally, resume the stopped process. This will deliver the | |
674 | SIGSTOP (or a higher priority signal, just like normal | |
675 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 676 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
677 | } |
678 | ||
0d62e5e8 | 679 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
680 | brings it to a halt. |
681 | ||
682 | There are several cases to consider here: | |
683 | ||
684 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 685 | of a new thread that is being created. |
d50171e4 PA |
686 | In this case we should ignore that SIGSTOP and resume the |
687 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 688 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 689 | resume_continue. |
0e21c1ec DE |
690 | |
691 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
692 | to it via attach_inferior. |
693 | In this case we want the process thread to stop. | |
d50171e4 PA |
694 | This is handled by having linux_attach set last_resume_kind == |
695 | resume_stop after we return. | |
e3deef73 LM |
696 | |
697 | If the pid we are attaching to is also the tgid, we attach to and | |
698 | stop all the existing threads. Otherwise, we attach to pid and | |
699 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
700 | |
701 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
702 | existing threads. |
703 | In this case we want the thread to stop. | |
704 | FIXME: This case is currently not properly handled. | |
705 | We should wait for the SIGSTOP but don't. Things work apparently | |
706 | because enough time passes between when we ptrace (ATTACH) and when | |
707 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
708 | |
709 | On the other hand, if we are currently trying to stop all threads, we | |
710 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 711 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
712 | end of the list, and so the new thread has not yet reached |
713 | wait_for_sigstop (but will). */ | |
d50171e4 | 714 | new_lwp->stop_expected = 1; |
0d62e5e8 | 715 | |
7ae1a6a6 | 716 | return 0; |
95954743 PA |
717 | } |
718 | ||
8784d563 PA |
719 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
720 | already attached. Returns true if a new LWP is found, false | |
721 | otherwise. */ | |
722 | ||
723 | static int | |
724 | attach_proc_task_lwp_callback (ptid_t ptid) | |
725 | { | |
726 | /* Is this a new thread? */ | |
727 | if (find_thread_ptid (ptid) == NULL) | |
728 | { | |
729 | int lwpid = ptid_get_lwp (ptid); | |
730 | int err; | |
731 | ||
732 | if (debug_threads) | |
733 | debug_printf ("Found new lwp %d\n", lwpid); | |
734 | ||
735 | err = linux_attach_lwp (ptid); | |
736 | ||
737 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
738 | is returned if the thread's task still exists, and is marked | |
739 | as exited or zombie, as well as other conditions, so in that | |
740 | case, confirm the status in /proc/PID/status. */ | |
741 | if (err == ESRCH | |
742 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
743 | { | |
744 | if (debug_threads) | |
745 | { | |
746 | debug_printf ("Cannot attach to lwp %d: " | |
747 | "thread is gone (%d: %s)\n", | |
748 | lwpid, err, strerror (err)); | |
749 | } | |
750 | } | |
751 | else if (err != 0) | |
752 | { | |
753 | warning (_("Cannot attach to lwp %d: %s"), | |
754 | lwpid, | |
755 | linux_ptrace_attach_fail_reason_string (ptid, err)); | |
756 | } | |
757 | ||
758 | return 1; | |
759 | } | |
760 | return 0; | |
761 | } | |
762 | ||
e3deef73 LM |
763 | /* Attach to PID. If PID is the tgid, attach to it and all |
764 | of its threads. */ | |
765 | ||
c52daf70 | 766 | static int |
a1928bad | 767 | linux_attach (unsigned long pid) |
0d62e5e8 | 768 | { |
7ae1a6a6 PA |
769 | ptid_t ptid = ptid_build (pid, pid, 0); |
770 | int err; | |
771 | ||
e3deef73 LM |
772 | /* Attach to PID. We will check for other threads |
773 | soon. */ | |
7ae1a6a6 PA |
774 | err = linux_attach_lwp (ptid); |
775 | if (err != 0) | |
776 | error ("Cannot attach to process %ld: %s", | |
8784d563 | 777 | pid, linux_ptrace_attach_fail_reason_string (ptid, err)); |
7ae1a6a6 | 778 | |
95954743 | 779 | linux_add_process (pid, 1); |
0d62e5e8 | 780 | |
bd99dc85 PA |
781 | if (!non_stop) |
782 | { | |
8336d594 PA |
783 | struct thread_info *thread; |
784 | ||
785 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
786 | process. It will be collected by wait shortly. */ | |
787 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
788 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 789 | } |
0d62e5e8 | 790 | |
8784d563 PA |
791 | /* We must attach to every LWP. If /proc is mounted, use that to |
792 | find them now. On the one hand, the inferior may be using raw | |
793 | clone instead of using pthreads. On the other hand, even if it | |
794 | is using pthreads, GDB may not be connected yet (thread_db needs | |
795 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
796 | structures in the inferior's address space to find the list of | |
797 | threads/LWPs, and those structures may well be corrupted. Note | |
798 | that once thread_db is loaded, we'll still use it to list threads | |
799 | and associate pthread info with each LWP. */ | |
800 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
95954743 PA |
801 | return 0; |
802 | } | |
803 | ||
804 | struct counter | |
805 | { | |
806 | int pid; | |
807 | int count; | |
808 | }; | |
809 | ||
810 | static int | |
811 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
812 | { | |
813 | struct counter *counter = args; | |
814 | ||
815 | if (ptid_get_pid (entry->id) == counter->pid) | |
816 | { | |
817 | if (++counter->count > 1) | |
818 | return 1; | |
819 | } | |
d61ddec4 | 820 | |
da6d8c04 DJ |
821 | return 0; |
822 | } | |
823 | ||
95954743 | 824 | static int |
fa96cb38 | 825 | last_thread_of_process_p (int pid) |
95954743 | 826 | { |
95954743 | 827 | struct counter counter = { pid , 0 }; |
da6d8c04 | 828 | |
95954743 PA |
829 | return (find_inferior (&all_threads, |
830 | second_thread_of_pid_p, &counter) == NULL); | |
831 | } | |
832 | ||
da84f473 PA |
833 | /* Kill LWP. */ |
834 | ||
835 | static void | |
836 | linux_kill_one_lwp (struct lwp_info *lwp) | |
837 | { | |
d86d4aaf DE |
838 | struct thread_info *thr = get_lwp_thread (lwp); |
839 | int pid = lwpid_of (thr); | |
da84f473 PA |
840 | |
841 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
842 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
843 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
844 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
845 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
846 | per process, not one for each thread. But since we still support | |
847 | linuxthreads, and we also support debugging programs using raw | |
848 | clone without CLONE_THREAD, we send one for each thread. For | |
849 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
850 | about some old kernels where PTRACE_KILL might work better | |
851 | (dubious if there are any such, but that's why it's paranoia), so | |
852 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
853 | everywhere. */ | |
854 | ||
855 | errno = 0; | |
69ff6be5 | 856 | kill_lwp (pid, SIGKILL); |
da84f473 | 857 | if (debug_threads) |
ce9e3fe7 PA |
858 | { |
859 | int save_errno = errno; | |
860 | ||
861 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
862 | target_pid_to_str (ptid_of (thr)), | |
863 | save_errno ? strerror (save_errno) : "OK"); | |
864 | } | |
da84f473 PA |
865 | |
866 | errno = 0; | |
b8e1b30e | 867 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 868 | if (debug_threads) |
ce9e3fe7 PA |
869 | { |
870 | int save_errno = errno; | |
871 | ||
872 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
873 | target_pid_to_str (ptid_of (thr)), | |
874 | save_errno ? strerror (save_errno) : "OK"); | |
875 | } | |
da84f473 PA |
876 | } |
877 | ||
e76126e8 PA |
878 | /* Kill LWP and wait for it to die. */ |
879 | ||
880 | static void | |
881 | kill_wait_lwp (struct lwp_info *lwp) | |
882 | { | |
883 | struct thread_info *thr = get_lwp_thread (lwp); | |
884 | int pid = ptid_get_pid (ptid_of (thr)); | |
885 | int lwpid = ptid_get_lwp (ptid_of (thr)); | |
886 | int wstat; | |
887 | int res; | |
888 | ||
889 | if (debug_threads) | |
890 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
891 | ||
892 | do | |
893 | { | |
894 | linux_kill_one_lwp (lwp); | |
895 | ||
896 | /* Make sure it died. Notes: | |
897 | ||
898 | - The loop is most likely unnecessary. | |
899 | ||
900 | - We don't use linux_wait_for_event as that could delete lwps | |
901 | while we're iterating over them. We're not interested in | |
902 | any pending status at this point, only in making sure all | |
903 | wait status on the kernel side are collected until the | |
904 | process is reaped. | |
905 | ||
906 | - We don't use __WALL here as the __WALL emulation relies on | |
907 | SIGCHLD, and killing a stopped process doesn't generate | |
908 | one, nor an exit status. | |
909 | */ | |
910 | res = my_waitpid (lwpid, &wstat, 0); | |
911 | if (res == -1 && errno == ECHILD) | |
912 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
913 | } while (res > 0 && WIFSTOPPED (wstat)); | |
914 | ||
915 | gdb_assert (res > 0); | |
916 | } | |
917 | ||
da84f473 PA |
918 | /* Callback for `find_inferior'. Kills an lwp of a given process, |
919 | except the leader. */ | |
95954743 PA |
920 | |
921 | static int | |
da84f473 | 922 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 923 | { |
0d62e5e8 | 924 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 925 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
926 | int pid = * (int *) args; |
927 | ||
928 | if (ptid_get_pid (entry->id) != pid) | |
929 | return 0; | |
0d62e5e8 | 930 | |
fd500816 DJ |
931 | /* We avoid killing the first thread here, because of a Linux kernel (at |
932 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
933 | the children get a chance to be reaped, it will remain a zombie | |
934 | forever. */ | |
95954743 | 935 | |
d86d4aaf | 936 | if (lwpid_of (thread) == pid) |
95954743 PA |
937 | { |
938 | if (debug_threads) | |
87ce2a04 DE |
939 | debug_printf ("lkop: is last of process %s\n", |
940 | target_pid_to_str (entry->id)); | |
95954743 PA |
941 | return 0; |
942 | } | |
fd500816 | 943 | |
e76126e8 | 944 | kill_wait_lwp (lwp); |
95954743 | 945 | return 0; |
da6d8c04 DJ |
946 | } |
947 | ||
95954743 PA |
948 | static int |
949 | linux_kill (int pid) | |
0d62e5e8 | 950 | { |
95954743 | 951 | struct process_info *process; |
54a0b537 | 952 | struct lwp_info *lwp; |
fd500816 | 953 | |
95954743 PA |
954 | process = find_process_pid (pid); |
955 | if (process == NULL) | |
956 | return -1; | |
9d606399 | 957 | |
f9e39928 PA |
958 | /* If we're killing a running inferior, make sure it is stopped |
959 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 960 | stop_all_lwps (0, NULL); |
f9e39928 | 961 | |
da84f473 | 962 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 963 | |
54a0b537 | 964 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 965 | thread in the list, so do so now. */ |
95954743 | 966 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 967 | |
784867a5 | 968 | if (lwp == NULL) |
fd500816 | 969 | { |
784867a5 | 970 | if (debug_threads) |
d86d4aaf DE |
971 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
972 | pid); | |
784867a5 JK |
973 | } |
974 | else | |
e76126e8 | 975 | kill_wait_lwp (lwp); |
2d717e4f | 976 | |
8336d594 | 977 | the_target->mourn (process); |
f9e39928 PA |
978 | |
979 | /* Since we presently can only stop all lwps of all processes, we | |
980 | need to unstop lwps of other processes. */ | |
7984d532 | 981 | unstop_all_lwps (0, NULL); |
95954743 | 982 | return 0; |
0d62e5e8 DJ |
983 | } |
984 | ||
9b224c5e PA |
985 | /* Get pending signal of THREAD, for detaching purposes. This is the |
986 | signal the thread last stopped for, which we need to deliver to the | |
987 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
988 | ||
989 | static int | |
990 | get_detach_signal (struct thread_info *thread) | |
991 | { | |
a493e3e2 | 992 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
993 | int status; |
994 | struct lwp_info *lp = get_thread_lwp (thread); | |
995 | ||
996 | if (lp->status_pending_p) | |
997 | status = lp->status_pending; | |
998 | else | |
999 | { | |
1000 | /* If the thread had been suspended by gdbserver, and it stopped | |
1001 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1002 | want to deliver that SIGSTOP. */ | |
1003 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1004 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1005 | return 0; |
1006 | ||
1007 | /* Otherwise, we may need to deliver the signal we | |
1008 | intercepted. */ | |
1009 | status = lp->last_status; | |
1010 | } | |
1011 | ||
1012 | if (!WIFSTOPPED (status)) | |
1013 | { | |
1014 | if (debug_threads) | |
87ce2a04 | 1015 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1016 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1017 | return 0; |
1018 | } | |
1019 | ||
1020 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1021 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1022 | { |
1023 | if (debug_threads) | |
87ce2a04 DE |
1024 | debug_printf ("GPS: lwp %s had stopped with extended " |
1025 | "status: no pending signal\n", | |
d86d4aaf | 1026 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1027 | return 0; |
1028 | } | |
1029 | ||
2ea28649 | 1030 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1031 | |
1032 | if (program_signals_p && !program_signals[signo]) | |
1033 | { | |
1034 | if (debug_threads) | |
87ce2a04 | 1035 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1036 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1037 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1038 | return 0; |
1039 | } | |
1040 | else if (!program_signals_p | |
1041 | /* If we have no way to know which signals GDB does not | |
1042 | want to have passed to the program, assume | |
1043 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1044 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1045 | { |
1046 | if (debug_threads) | |
87ce2a04 DE |
1047 | debug_printf ("GPS: lwp %s had signal %s, " |
1048 | "but we don't know if we should pass it. " | |
1049 | "Default to not.\n", | |
d86d4aaf | 1050 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1051 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1052 | return 0; |
1053 | } | |
1054 | else | |
1055 | { | |
1056 | if (debug_threads) | |
87ce2a04 | 1057 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1058 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1059 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1060 | |
1061 | return WSTOPSIG (status); | |
1062 | } | |
1063 | } | |
1064 | ||
95954743 PA |
1065 | static int |
1066 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1067 | { |
1068 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1069 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1070 | int pid = * (int *) args; |
9b224c5e | 1071 | int sig; |
95954743 PA |
1072 | |
1073 | if (ptid_get_pid (entry->id) != pid) | |
1074 | return 0; | |
6ad8ae5c | 1075 | |
9b224c5e | 1076 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1077 | if (lwp->stop_expected) |
ae13219e | 1078 | { |
9b224c5e | 1079 | if (debug_threads) |
87ce2a04 | 1080 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1081 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1082 | |
d86d4aaf | 1083 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1084 | lwp->stop_expected = 0; |
ae13219e DJ |
1085 | } |
1086 | ||
1087 | /* Flush any pending changes to the process's registers. */ | |
d86d4aaf | 1088 | regcache_invalidate_thread (thread); |
ae13219e | 1089 | |
9b224c5e PA |
1090 | /* Pass on any pending signal for this thread. */ |
1091 | sig = get_detach_signal (thread); | |
1092 | ||
ae13219e | 1093 | /* Finally, let it resume. */ |
82bfbe7e PA |
1094 | if (the_low_target.prepare_to_resume != NULL) |
1095 | the_low_target.prepare_to_resume (lwp); | |
d86d4aaf | 1096 | if (ptrace (PTRACE_DETACH, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
b8e1b30e | 1097 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
9b224c5e | 1098 | error (_("Can't detach %s: %s"), |
d86d4aaf | 1099 | target_pid_to_str (ptid_of (thread)), |
9b224c5e | 1100 | strerror (errno)); |
bd99dc85 PA |
1101 | |
1102 | delete_lwp (lwp); | |
95954743 | 1103 | return 0; |
6ad8ae5c DJ |
1104 | } |
1105 | ||
95954743 PA |
1106 | static int |
1107 | linux_detach (int pid) | |
1108 | { | |
1109 | struct process_info *process; | |
1110 | ||
1111 | process = find_process_pid (pid); | |
1112 | if (process == NULL) | |
1113 | return -1; | |
1114 | ||
f9e39928 PA |
1115 | /* Stop all threads before detaching. First, ptrace requires that |
1116 | the thread is stopped to sucessfully detach. Second, thread_db | |
1117 | may need to uninstall thread event breakpoints from memory, which | |
1118 | only works with a stopped process anyway. */ | |
7984d532 | 1119 | stop_all_lwps (0, NULL); |
f9e39928 | 1120 | |
ca5c370d | 1121 | #ifdef USE_THREAD_DB |
8336d594 | 1122 | thread_db_detach (process); |
ca5c370d PA |
1123 | #endif |
1124 | ||
fa593d66 PA |
1125 | /* Stabilize threads (move out of jump pads). */ |
1126 | stabilize_threads (); | |
1127 | ||
95954743 | 1128 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1129 | |
1130 | the_target->mourn (process); | |
f9e39928 PA |
1131 | |
1132 | /* Since we presently can only stop all lwps of all processes, we | |
1133 | need to unstop lwps of other processes. */ | |
7984d532 | 1134 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1135 | return 0; |
1136 | } | |
1137 | ||
1138 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1139 | ||
1140 | static int | |
1141 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1142 | { | |
d86d4aaf DE |
1143 | struct thread_info *thread = (struct thread_info *) entry; |
1144 | struct lwp_info *lwp = get_thread_lwp (thread); | |
f9e39928 PA |
1145 | struct process_info *process = proc; |
1146 | ||
d86d4aaf | 1147 | if (pid_of (thread) == pid_of (process)) |
f9e39928 PA |
1148 | delete_lwp (lwp); |
1149 | ||
dd6953e1 | 1150 | return 0; |
6ad8ae5c DJ |
1151 | } |
1152 | ||
8336d594 PA |
1153 | static void |
1154 | linux_mourn (struct process_info *process) | |
1155 | { | |
1156 | struct process_info_private *priv; | |
1157 | ||
1158 | #ifdef USE_THREAD_DB | |
1159 | thread_db_mourn (process); | |
1160 | #endif | |
1161 | ||
d86d4aaf | 1162 | find_inferior (&all_threads, delete_lwp_callback, process); |
f9e39928 | 1163 | |
8336d594 PA |
1164 | /* Freeing all private data. */ |
1165 | priv = process->private; | |
1166 | free (priv->arch_private); | |
1167 | free (priv); | |
1168 | process->private = NULL; | |
505106cd PA |
1169 | |
1170 | remove_process (process); | |
8336d594 PA |
1171 | } |
1172 | ||
444d6139 | 1173 | static void |
95954743 | 1174 | linux_join (int pid) |
444d6139 | 1175 | { |
444d6139 PA |
1176 | int status, ret; |
1177 | ||
1178 | do { | |
95954743 | 1179 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1180 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1181 | break; | |
1182 | } while (ret != -1 || errno != ECHILD); | |
1183 | } | |
1184 | ||
6ad8ae5c | 1185 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1186 | static int |
95954743 | 1187 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1188 | { |
95954743 PA |
1189 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1190 | ||
1191 | /* We assume we always know if a thread exits. If a whole process | |
1192 | exited but we still haven't been able to report it to GDB, we'll | |
1193 | hold on to the last lwp of the dead process. */ | |
1194 | if (lwp != NULL) | |
1195 | return !lwp->dead; | |
0d62e5e8 DJ |
1196 | else |
1197 | return 0; | |
1198 | } | |
1199 | ||
6bf5e0ba | 1200 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1201 | static int |
d50171e4 | 1202 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1203 | { |
d86d4aaf DE |
1204 | struct thread_info *thread = (struct thread_info *) entry; |
1205 | struct lwp_info *lwp = get_thread_lwp (thread); | |
95954743 PA |
1206 | ptid_t ptid = * (ptid_t *) arg; |
1207 | ||
1208 | /* Check if we're only interested in events from a specific process | |
1209 | or its lwps. */ | |
1210 | if (!ptid_equal (minus_one_ptid, ptid) | |
d86d4aaf | 1211 | && ptid_get_pid (ptid) != ptid_get_pid (thread->entry.id)) |
95954743 | 1212 | return 0; |
0d62e5e8 | 1213 | |
d50171e4 PA |
1214 | /* If we got a `vCont;t', but we haven't reported a stop yet, do |
1215 | report any status pending the LWP may have. */ | |
8336d594 | 1216 | if (thread->last_resume_kind == resume_stop |
7984d532 | 1217 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) |
d50171e4 | 1218 | return 0; |
0d62e5e8 | 1219 | |
d50171e4 | 1220 | return lwp->status_pending_p; |
0d62e5e8 DJ |
1221 | } |
1222 | ||
95954743 PA |
1223 | static int |
1224 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1225 | { | |
1226 | ptid_t ptid = *(ptid_t *) data; | |
1227 | int lwp; | |
1228 | ||
1229 | if (ptid_get_lwp (ptid) != 0) | |
1230 | lwp = ptid_get_lwp (ptid); | |
1231 | else | |
1232 | lwp = ptid_get_pid (ptid); | |
1233 | ||
1234 | if (ptid_get_lwp (entry->id) == lwp) | |
1235 | return 1; | |
1236 | ||
1237 | return 0; | |
1238 | } | |
1239 | ||
1240 | struct lwp_info * | |
1241 | find_lwp_pid (ptid_t ptid) | |
1242 | { | |
d86d4aaf DE |
1243 | struct inferior_list_entry *thread |
1244 | = find_inferior (&all_threads, same_lwp, &ptid); | |
1245 | ||
1246 | if (thread == NULL) | |
1247 | return NULL; | |
1248 | ||
1249 | return get_thread_lwp ((struct thread_info *) thread); | |
95954743 PA |
1250 | } |
1251 | ||
fa96cb38 | 1252 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1253 | |
fa96cb38 PA |
1254 | static int |
1255 | num_lwps (int pid) | |
1256 | { | |
1257 | struct inferior_list_entry *inf, *tmp; | |
1258 | int count = 0; | |
0d62e5e8 | 1259 | |
fa96cb38 | 1260 | ALL_INFERIORS (&all_threads, inf, tmp) |
24a09b5f | 1261 | { |
fa96cb38 PA |
1262 | if (ptid_get_pid (inf->id) == pid) |
1263 | count++; | |
24a09b5f | 1264 | } |
3aee8918 | 1265 | |
fa96cb38 PA |
1266 | return count; |
1267 | } | |
d61ddec4 | 1268 | |
fa96cb38 PA |
1269 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1270 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1271 | |
fa96cb38 PA |
1272 | static void |
1273 | check_zombie_leaders (void) | |
1274 | { | |
1275 | struct process_info *proc, *tmp; | |
c3adc08c | 1276 | |
fa96cb38 | 1277 | ALL_PROCESSES (proc, tmp) |
c3adc08c | 1278 | { |
fa96cb38 PA |
1279 | pid_t leader_pid = pid_of (proc); |
1280 | struct lwp_info *leader_lp; | |
c3adc08c | 1281 | |
fa96cb38 | 1282 | leader_lp = find_lwp_pid (pid_to_ptid (leader_pid)); |
c3adc08c | 1283 | |
fa96cb38 PA |
1284 | if (debug_threads) |
1285 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1286 | "num_lwps=%d, zombie=%d\n", | |
1287 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1288 | linux_proc_pid_is_zombie (leader_pid)); | |
1289 | ||
1290 | if (leader_lp != NULL | |
1291 | /* Check if there are other threads in the group, as we may | |
1292 | have raced with the inferior simply exiting. */ | |
1293 | && !last_thread_of_process_p (leader_pid) | |
1294 | && linux_proc_pid_is_zombie (leader_pid)) | |
1295 | { | |
1296 | /* A leader zombie can mean one of two things: | |
1297 | ||
1298 | - It exited, and there's an exit status pending | |
1299 | available, or only the leader exited (not the whole | |
1300 | program). In the latter case, we can't waitpid the | |
1301 | leader's exit status until all other threads are gone. | |
1302 | ||
1303 | - There are 3 or more threads in the group, and a thread | |
1304 | other than the leader exec'd. On an exec, the Linux | |
1305 | kernel destroys all other threads (except the execing | |
1306 | one) in the thread group, and resets the execing thread's | |
1307 | tid to the tgid. No exit notification is sent for the | |
1308 | execing thread -- from the ptracer's perspective, it | |
1309 | appears as though the execing thread just vanishes. | |
1310 | Until we reap all other threads except the leader and the | |
1311 | execing thread, the leader will be zombie, and the | |
1312 | execing thread will be in `D (disc sleep)'. As soon as | |
1313 | all other threads are reaped, the execing thread changes | |
1314 | it's tid to the tgid, and the previous (zombie) leader | |
1315 | vanishes, giving place to the "new" leader. We could try | |
1316 | distinguishing the exit and exec cases, by waiting once | |
1317 | more, and seeing if something comes out, but it doesn't | |
1318 | sound useful. The previous leader _does_ go away, and | |
1319 | we'll re-add the new one once we see the exec event | |
1320 | (which is just the same as what would happen if the | |
1321 | previous leader did exit voluntarily before some other | |
1322 | thread execs). */ | |
c3adc08c | 1323 | |
fa96cb38 PA |
1324 | if (debug_threads) |
1325 | fprintf (stderr, | |
1326 | "CZL: Thread group leader %d zombie " | |
1327 | "(it exited, or another thread execd).\n", | |
1328 | leader_pid); | |
c3adc08c | 1329 | |
fa96cb38 | 1330 | delete_lwp (leader_lp); |
c3adc08c PA |
1331 | } |
1332 | } | |
fa96cb38 | 1333 | } |
c3adc08c | 1334 | |
fa96cb38 PA |
1335 | /* Callback for `find_inferior'. Returns the first LWP that is not |
1336 | stopped. ARG is a PTID filter. */ | |
d50171e4 | 1337 | |
fa96cb38 PA |
1338 | static int |
1339 | not_stopped_callback (struct inferior_list_entry *entry, void *arg) | |
1340 | { | |
1341 | struct thread_info *thr = (struct thread_info *) entry; | |
1342 | struct lwp_info *lwp; | |
1343 | ptid_t filter = *(ptid_t *) arg; | |
47c0c975 | 1344 | |
fa96cb38 PA |
1345 | if (!ptid_match (ptid_of (thr), filter)) |
1346 | return 0; | |
bd99dc85 | 1347 | |
fa96cb38 PA |
1348 | lwp = get_thread_lwp (thr); |
1349 | if (!lwp->stopped) | |
1350 | return 1; | |
1351 | ||
1352 | return 0; | |
0d62e5e8 | 1353 | } |
611cb4a5 | 1354 | |
219f2f23 PA |
1355 | /* This function should only be called if the LWP got a SIGTRAP. |
1356 | ||
1357 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1358 | event was handled, 0 otherwise. */ | |
1359 | ||
1360 | static int | |
1361 | handle_tracepoints (struct lwp_info *lwp) | |
1362 | { | |
1363 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1364 | int tpoint_related_event = 0; | |
1365 | ||
7984d532 PA |
1366 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1367 | uninsert tracepoints. To do this, we temporarily pause all | |
1368 | threads, unpatch away, and then unpause threads. We need to make | |
1369 | sure the unpausing doesn't resume LWP too. */ | |
1370 | lwp->suspended++; | |
1371 | ||
219f2f23 PA |
1372 | /* And we need to be sure that any all-threads-stopping doesn't try |
1373 | to move threads out of the jump pads, as it could deadlock the | |
1374 | inferior (LWP could be in the jump pad, maybe even holding the | |
1375 | lock.) */ | |
1376 | ||
1377 | /* Do any necessary step collect actions. */ | |
1378 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1379 | ||
fa593d66 PA |
1380 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1381 | ||
219f2f23 PA |
1382 | /* See if we just hit a tracepoint and do its main collect |
1383 | actions. */ | |
1384 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1385 | ||
7984d532 PA |
1386 | lwp->suspended--; |
1387 | ||
1388 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1389 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1390 | |
219f2f23 PA |
1391 | if (tpoint_related_event) |
1392 | { | |
1393 | if (debug_threads) | |
87ce2a04 | 1394 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1395 | return 1; |
1396 | } | |
1397 | ||
1398 | return 0; | |
1399 | } | |
1400 | ||
fa593d66 PA |
1401 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1402 | fast tracepoint. */ | |
1403 | ||
1404 | static int | |
1405 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1406 | struct fast_tpoint_collect_status *status) | |
1407 | { | |
1408 | CORE_ADDR thread_area; | |
d86d4aaf | 1409 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1410 | |
1411 | if (the_low_target.get_thread_area == NULL) | |
1412 | return 0; | |
1413 | ||
1414 | /* Get the thread area address. This is used to recognize which | |
1415 | thread is which when tracing with the in-process agent library. | |
1416 | We don't read anything from the address, and treat it as opaque; | |
1417 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 1418 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
fa593d66 PA |
1419 | return 0; |
1420 | ||
1421 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1422 | } | |
1423 | ||
1424 | /* The reason we resume in the caller, is because we want to be able | |
1425 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1426 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1427 | refuses to resume. */ | |
1428 | ||
1429 | static int | |
1430 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1431 | { | |
0bfdf32f | 1432 | struct thread_info *saved_thread; |
fa593d66 | 1433 | |
0bfdf32f GB |
1434 | saved_thread = current_thread; |
1435 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
1436 | |
1437 | if ((wstat == NULL | |
1438 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1439 | && supports_fast_tracepoints () | |
58b4daa5 | 1440 | && agent_loaded_p ()) |
fa593d66 PA |
1441 | { |
1442 | struct fast_tpoint_collect_status status; | |
1443 | int r; | |
1444 | ||
1445 | if (debug_threads) | |
87ce2a04 DE |
1446 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1447 | "jump pad.\n", | |
0bfdf32f | 1448 | lwpid_of (current_thread)); |
fa593d66 PA |
1449 | |
1450 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1451 | ||
1452 | if (wstat == NULL | |
1453 | || (WSTOPSIG (*wstat) != SIGILL | |
1454 | && WSTOPSIG (*wstat) != SIGFPE | |
1455 | && WSTOPSIG (*wstat) != SIGSEGV | |
1456 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1457 | { | |
1458 | lwp->collecting_fast_tracepoint = r; | |
1459 | ||
1460 | if (r != 0) | |
1461 | { | |
1462 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1463 | { | |
1464 | /* Haven't executed the original instruction yet. | |
1465 | Set breakpoint there, and wait till it's hit, | |
1466 | then single-step until exiting the jump pad. */ | |
1467 | lwp->exit_jump_pad_bkpt | |
1468 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1469 | } | |
1470 | ||
1471 | if (debug_threads) | |
87ce2a04 DE |
1472 | debug_printf ("Checking whether LWP %ld needs to move out of " |
1473 | "the jump pad...it does\n", | |
0bfdf32f GB |
1474 | lwpid_of (current_thread)); |
1475 | current_thread = saved_thread; | |
fa593d66 PA |
1476 | |
1477 | return 1; | |
1478 | } | |
1479 | } | |
1480 | else | |
1481 | { | |
1482 | /* If we get a synchronous signal while collecting, *and* | |
1483 | while executing the (relocated) original instruction, | |
1484 | reset the PC to point at the tpoint address, before | |
1485 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1486 | report the signal to GDB, and pray for the best. */ | |
1487 | ||
1488 | lwp->collecting_fast_tracepoint = 0; | |
1489 | ||
1490 | if (r != 0 | |
1491 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1492 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1493 | { | |
1494 | siginfo_t info; | |
1495 | struct regcache *regcache; | |
1496 | ||
1497 | /* The si_addr on a few signals references the address | |
1498 | of the faulting instruction. Adjust that as | |
1499 | well. */ | |
1500 | if ((WSTOPSIG (*wstat) == SIGILL | |
1501 | || WSTOPSIG (*wstat) == SIGFPE | |
1502 | || WSTOPSIG (*wstat) == SIGBUS | |
1503 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 1504 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1505 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
1506 | /* Final check just to make sure we don't clobber |
1507 | the siginfo of non-kernel-sent signals. */ | |
1508 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1509 | { | |
1510 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 1511 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1512 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
1513 | } |
1514 | ||
0bfdf32f | 1515 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
1516 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
1517 | lwp->stop_pc = status.tpoint_addr; | |
1518 | ||
1519 | /* Cancel any fast tracepoint lock this thread was | |
1520 | holding. */ | |
1521 | force_unlock_trace_buffer (); | |
1522 | } | |
1523 | ||
1524 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1525 | { | |
1526 | if (debug_threads) | |
87ce2a04 DE |
1527 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
1528 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
1529 | |
1530 | stop_all_lwps (1, lwp); | |
1531 | cancel_breakpoints (); | |
1532 | ||
1533 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1534 | lwp->exit_jump_pad_bkpt = NULL; | |
1535 | ||
1536 | unstop_all_lwps (1, lwp); | |
1537 | ||
1538 | gdb_assert (lwp->suspended >= 0); | |
1539 | } | |
1540 | } | |
1541 | } | |
1542 | ||
1543 | if (debug_threads) | |
87ce2a04 DE |
1544 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1545 | "jump pad...no\n", | |
0bfdf32f | 1546 | lwpid_of (current_thread)); |
0cccb683 | 1547 | |
0bfdf32f | 1548 | current_thread = saved_thread; |
fa593d66 PA |
1549 | return 0; |
1550 | } | |
1551 | ||
1552 | /* Enqueue one signal in the "signals to report later when out of the | |
1553 | jump pad" list. */ | |
1554 | ||
1555 | static void | |
1556 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1557 | { | |
1558 | struct pending_signals *p_sig; | |
d86d4aaf | 1559 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1560 | |
1561 | if (debug_threads) | |
87ce2a04 | 1562 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 1563 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1564 | |
1565 | if (debug_threads) | |
1566 | { | |
1567 | struct pending_signals *sig; | |
1568 | ||
1569 | for (sig = lwp->pending_signals_to_report; | |
1570 | sig != NULL; | |
1571 | sig = sig->prev) | |
87ce2a04 DE |
1572 | debug_printf (" Already queued %d\n", |
1573 | sig->signal); | |
fa593d66 | 1574 | |
87ce2a04 | 1575 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
1576 | } |
1577 | ||
1a981360 PA |
1578 | /* Don't enqueue non-RT signals if they are already in the deferred |
1579 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1580 | twice) */ | |
1581 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1582 | { | |
1583 | struct pending_signals *sig; | |
1584 | ||
1585 | for (sig = lwp->pending_signals_to_report; | |
1586 | sig != NULL; | |
1587 | sig = sig->prev) | |
1588 | { | |
1589 | if (sig->signal == WSTOPSIG (*wstat)) | |
1590 | { | |
1591 | if (debug_threads) | |
87ce2a04 DE |
1592 | debug_printf ("Not requeuing already queued non-RT signal %d" |
1593 | " for LWP %ld\n", | |
1594 | sig->signal, | |
d86d4aaf | 1595 | lwpid_of (thread)); |
1a981360 PA |
1596 | return; |
1597 | } | |
1598 | } | |
1599 | } | |
1600 | ||
fa593d66 PA |
1601 | p_sig = xmalloc (sizeof (*p_sig)); |
1602 | p_sig->prev = lwp->pending_signals_to_report; | |
1603 | p_sig->signal = WSTOPSIG (*wstat); | |
1604 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
d86d4aaf | 1605 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1606 | &p_sig->info); |
fa593d66 PA |
1607 | |
1608 | lwp->pending_signals_to_report = p_sig; | |
1609 | } | |
1610 | ||
1611 | /* Dequeue one signal from the "signals to report later when out of | |
1612 | the jump pad" list. */ | |
1613 | ||
1614 | static int | |
1615 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1616 | { | |
d86d4aaf DE |
1617 | struct thread_info *thread = get_lwp_thread (lwp); |
1618 | ||
fa593d66 PA |
1619 | if (lwp->pending_signals_to_report != NULL) |
1620 | { | |
1621 | struct pending_signals **p_sig; | |
1622 | ||
1623 | p_sig = &lwp->pending_signals_to_report; | |
1624 | while ((*p_sig)->prev != NULL) | |
1625 | p_sig = &(*p_sig)->prev; | |
1626 | ||
1627 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1628 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 1629 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1630 | &(*p_sig)->info); |
fa593d66 PA |
1631 | free (*p_sig); |
1632 | *p_sig = NULL; | |
1633 | ||
1634 | if (debug_threads) | |
87ce2a04 | 1635 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 1636 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1637 | |
1638 | if (debug_threads) | |
1639 | { | |
1640 | struct pending_signals *sig; | |
1641 | ||
1642 | for (sig = lwp->pending_signals_to_report; | |
1643 | sig != NULL; | |
1644 | sig = sig->prev) | |
87ce2a04 DE |
1645 | debug_printf (" Still queued %d\n", |
1646 | sig->signal); | |
fa593d66 | 1647 | |
87ce2a04 | 1648 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
1649 | } |
1650 | ||
1651 | return 1; | |
1652 | } | |
1653 | ||
1654 | return 0; | |
1655 | } | |
1656 | ||
d50171e4 PA |
1657 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1658 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1659 | will handle the current event, eventually we will resume this LWP, | |
1660 | and this breakpoint will trap again. */ | |
1661 | ||
1662 | static int | |
1663 | cancel_breakpoint (struct lwp_info *lwp) | |
1664 | { | |
0bfdf32f | 1665 | struct thread_info *saved_thread; |
d50171e4 PA |
1666 | |
1667 | /* There's nothing to do if we don't support breakpoints. */ | |
1668 | if (!supports_breakpoints ()) | |
1669 | return 0; | |
1670 | ||
d50171e4 | 1671 | /* breakpoint_at reads from current inferior. */ |
0bfdf32f GB |
1672 | saved_thread = current_thread; |
1673 | current_thread = get_lwp_thread (lwp); | |
d50171e4 PA |
1674 | |
1675 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1676 | { | |
1677 | if (debug_threads) | |
87ce2a04 | 1678 | debug_printf ("CB: Push back breakpoint for %s\n", |
0bfdf32f | 1679 | target_pid_to_str (ptid_of (current_thread))); |
d50171e4 PA |
1680 | |
1681 | /* Back up the PC if necessary. */ | |
1682 | if (the_low_target.decr_pc_after_break) | |
1683 | { | |
1684 | struct regcache *regcache | |
0bfdf32f | 1685 | = get_thread_regcache (current_thread, 1); |
d50171e4 PA |
1686 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1687 | } | |
1688 | ||
0bfdf32f | 1689 | current_thread = saved_thread; |
d50171e4 PA |
1690 | return 1; |
1691 | } | |
1692 | else | |
1693 | { | |
1694 | if (debug_threads) | |
87ce2a04 DE |
1695 | debug_printf ("CB: No breakpoint found at %s for [%s]\n", |
1696 | paddress (lwp->stop_pc), | |
0bfdf32f | 1697 | target_pid_to_str (ptid_of (current_thread))); |
d50171e4 PA |
1698 | } |
1699 | ||
0bfdf32f | 1700 | current_thread = saved_thread; |
d50171e4 PA |
1701 | return 0; |
1702 | } | |
1703 | ||
c4d9ceb6 YQ |
1704 | /* Return true if the event in LP may be caused by breakpoint. */ |
1705 | ||
1706 | static int | |
1707 | lp_status_maybe_breakpoint (struct lwp_info *lp) | |
1708 | { | |
1709 | return (lp->status_pending_p | |
1710 | && WIFSTOPPED (lp->status_pending) | |
1711 | && (WSTOPSIG (lp->status_pending) == SIGTRAP | |
1712 | /* SIGILL and SIGSEGV are also treated as traps in case a | |
1713 | breakpoint is inserted at the current PC. */ | |
1714 | || WSTOPSIG (lp->status_pending) == SIGILL | |
1715 | || WSTOPSIG (lp->status_pending) == SIGSEGV)); | |
1716 | } | |
1717 | ||
fa96cb38 PA |
1718 | /* Do low-level handling of the event, and check if we should go on |
1719 | and pass it to caller code. Return the affected lwp if we are, or | |
1720 | NULL otherwise. */ | |
1721 | ||
1722 | static struct lwp_info * | |
1723 | linux_low_filter_event (ptid_t filter_ptid, int lwpid, int wstat) | |
1724 | { | |
1725 | struct lwp_info *child; | |
1726 | struct thread_info *thread; | |
1727 | ||
1728 | child = find_lwp_pid (pid_to_ptid (lwpid)); | |
1729 | ||
1730 | /* If we didn't find a process, one of two things presumably happened: | |
1731 | - A process we started and then detached from has exited. Ignore it. | |
1732 | - A process we are controlling has forked and the new child's stop | |
1733 | was reported to us by the kernel. Save its PID. */ | |
1734 | if (child == NULL && WIFSTOPPED (wstat)) | |
1735 | { | |
1736 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
1737 | return NULL; | |
1738 | } | |
1739 | else if (child == NULL) | |
1740 | return NULL; | |
1741 | ||
1742 | thread = get_lwp_thread (child); | |
1743 | ||
1744 | child->stopped = 1; | |
1745 | ||
1746 | child->last_status = wstat; | |
1747 | ||
1748 | if (WIFSTOPPED (wstat)) | |
1749 | { | |
1750 | struct process_info *proc; | |
1751 | ||
1752 | /* Architecture-specific setup after inferior is running. This | |
1753 | needs to happen after we have attached to the inferior and it | |
1754 | is stopped for the first time, but before we access any | |
1755 | inferior registers. */ | |
1756 | proc = find_process_pid (pid_of (thread)); | |
1757 | if (proc->private->new_inferior) | |
1758 | { | |
0bfdf32f | 1759 | struct thread_info *saved_thread; |
fa96cb38 | 1760 | |
0bfdf32f GB |
1761 | saved_thread = current_thread; |
1762 | current_thread = thread; | |
fa96cb38 PA |
1763 | |
1764 | the_low_target.arch_setup (); | |
1765 | ||
0bfdf32f | 1766 | current_thread = saved_thread; |
fa96cb38 PA |
1767 | |
1768 | proc->private->new_inferior = 0; | |
1769 | } | |
1770 | } | |
1771 | ||
1772 | /* Store the STOP_PC, with adjustment applied. This depends on the | |
1773 | architecture being defined already (so that CHILD has a valid | |
1774 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1775 | not). */ | |
1776 | if (WIFSTOPPED (wstat)) | |
1777 | { | |
1778 | if (debug_threads | |
1779 | && the_low_target.get_pc != NULL) | |
1780 | { | |
0bfdf32f | 1781 | struct thread_info *saved_thread; |
fa96cb38 PA |
1782 | struct regcache *regcache; |
1783 | CORE_ADDR pc; | |
1784 | ||
0bfdf32f GB |
1785 | saved_thread = current_thread; |
1786 | current_thread = thread; | |
1787 | regcache = get_thread_regcache (current_thread, 1); | |
fa96cb38 PA |
1788 | pc = (*the_low_target.get_pc) (regcache); |
1789 | debug_printf ("linux_low_filter_event: pc is 0x%lx\n", (long) pc); | |
0bfdf32f | 1790 | current_thread = saved_thread; |
fa96cb38 PA |
1791 | } |
1792 | ||
1793 | child->stop_pc = get_stop_pc (child); | |
1794 | } | |
1795 | ||
1796 | /* Fetch the possibly triggered data watchpoint info and store it in | |
1797 | CHILD. | |
1798 | ||
1799 | On some archs, like x86, that use debug registers to set | |
1800 | watchpoints, it's possible that the way to know which watched | |
1801 | address trapped, is to check the register that is used to select | |
1802 | which address to watch. Problem is, between setting the | |
1803 | watchpoint and reading back which data address trapped, the user | |
1804 | may change the set of watchpoints, and, as a consequence, GDB | |
1805 | changes the debug registers in the inferior. To avoid reading | |
1806 | back a stale stopped-data-address when that happens, we cache in | |
1807 | LP the fact that a watchpoint trapped, and the corresponding data | |
1808 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1809 | changes the debug registers meanwhile, we have the cached data we | |
1810 | can rely on. */ | |
1811 | ||
1812 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP) | |
1813 | { | |
1814 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1815 | { | |
1816 | child->stopped_by_watchpoint = 0; | |
1817 | } | |
1818 | else | |
1819 | { | |
0bfdf32f | 1820 | struct thread_info *saved_thread; |
fa96cb38 | 1821 | |
0bfdf32f GB |
1822 | saved_thread = current_thread; |
1823 | current_thread = thread; | |
fa96cb38 PA |
1824 | |
1825 | child->stopped_by_watchpoint | |
1826 | = the_low_target.stopped_by_watchpoint (); | |
1827 | ||
1828 | if (child->stopped_by_watchpoint) | |
1829 | { | |
1830 | if (the_low_target.stopped_data_address != NULL) | |
1831 | child->stopped_data_address | |
1832 | = the_low_target.stopped_data_address (); | |
1833 | else | |
1834 | child->stopped_data_address = 0; | |
1835 | } | |
1836 | ||
0bfdf32f | 1837 | current_thread = saved_thread; |
fa96cb38 PA |
1838 | } |
1839 | } | |
1840 | ||
1841 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) | |
1842 | { | |
beed38b8 JB |
1843 | struct process_info *proc = find_process_pid (pid_of (thread)); |
1844 | ||
1845 | linux_enable_event_reporting (lwpid, proc->attached); | |
fa96cb38 PA |
1846 | child->must_set_ptrace_flags = 0; |
1847 | } | |
1848 | ||
1849 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP | |
89a5711c | 1850 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 PA |
1851 | { |
1852 | handle_extended_wait (child, wstat); | |
1853 | return NULL; | |
1854 | } | |
1855 | ||
1856 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP | |
1857 | && child->stop_expected) | |
1858 | { | |
1859 | if (debug_threads) | |
1860 | debug_printf ("Expected stop.\n"); | |
1861 | child->stop_expected = 0; | |
1862 | ||
1863 | if (thread->last_resume_kind == resume_stop) | |
1864 | { | |
1865 | /* We want to report the stop to the core. Treat the | |
1866 | SIGSTOP as a normal event. */ | |
1867 | } | |
1868 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
1869 | { | |
1870 | /* Stopping threads. We don't want this SIGSTOP to end up | |
1871 | pending in the FILTER_PTID handling below. */ | |
1872 | return NULL; | |
1873 | } | |
1874 | else | |
1875 | { | |
1876 | /* Filter out the event. */ | |
1877 | linux_resume_one_lwp (child, child->stepping, 0, NULL); | |
1878 | return NULL; | |
1879 | } | |
1880 | } | |
1881 | ||
1882 | /* Check if the thread has exited. */ | |
1883 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat)) | |
1884 | && num_lwps (pid_of (thread)) > 1) | |
1885 | { | |
1886 | if (debug_threads) | |
1887 | debug_printf ("LLW: %d exited.\n", lwpid); | |
1888 | ||
1889 | /* If there is at least one more LWP, then the exit signal | |
1890 | was not the end of the debugged application and should be | |
1891 | ignored. */ | |
1892 | delete_lwp (child); | |
1893 | return NULL; | |
1894 | } | |
1895 | ||
1896 | if (!ptid_match (ptid_of (thread), filter_ptid)) | |
1897 | { | |
1898 | if (debug_threads) | |
1899 | debug_printf ("LWP %d got an event %06x, leaving pending.\n", | |
1900 | lwpid, wstat); | |
1901 | ||
1902 | if (WIFSTOPPED (wstat)) | |
1903 | { | |
1904 | child->status_pending_p = 1; | |
1905 | child->status_pending = wstat; | |
1906 | ||
1907 | if (WSTOPSIG (wstat) != SIGSTOP) | |
1908 | { | |
1909 | /* Cancel breakpoint hits. The breakpoint may be | |
1910 | removed before we fetch events from this process to | |
1911 | report to the core. It is best not to assume the | |
1912 | moribund breakpoints heuristic always handles these | |
1913 | cases --- it could be too many events go through to | |
1914 | the core before this one is handled. All-stop always | |
1915 | cancels breakpoint hits in all threads. */ | |
1916 | if (non_stop | |
c4d9ceb6 | 1917 | && lp_status_maybe_breakpoint (child) |
fa96cb38 PA |
1918 | && cancel_breakpoint (child)) |
1919 | { | |
1920 | /* Throw away the SIGTRAP. */ | |
1921 | child->status_pending_p = 0; | |
1922 | ||
1923 | if (debug_threads) | |
1924 | debug_printf ("LLW: LWP %d hit a breakpoint while" | |
1925 | " waiting for another process;" | |
1926 | " cancelled it\n", lwpid); | |
1927 | } | |
1928 | } | |
1929 | } | |
1930 | else if (WIFEXITED (wstat) || WIFSIGNALED (wstat)) | |
1931 | { | |
1932 | if (debug_threads) | |
1933 | debug_printf ("LLWE: process %d exited while fetching " | |
1934 | "event from another LWP\n", lwpid); | |
1935 | ||
1936 | /* This was the last lwp in the process. Since events are | |
1937 | serialized to GDB core, and we can't report this one | |
1938 | right now, but GDB core and the other target layers will | |
1939 | want to be notified about the exit code/signal, leave the | |
1940 | status pending for the next time we're able to report | |
1941 | it. */ | |
1942 | mark_lwp_dead (child, wstat); | |
1943 | } | |
1944 | ||
1945 | return NULL; | |
1946 | } | |
1947 | ||
1948 | return child; | |
1949 | } | |
1950 | ||
d50171e4 PA |
1951 | /* When the event-loop is doing a step-over, this points at the thread |
1952 | being stepped. */ | |
1953 | ptid_t step_over_bkpt; | |
1954 | ||
fa96cb38 PA |
1955 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
1956 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
1957 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
1958 | lwps of a thread group; or a PTID representing a single lwp. Store | |
1959 | the stop status through the status pointer WSTAT. OPTIONS is | |
1960 | passed to the waitpid call. Return 0 if no event was found and | |
1961 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
1962 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 1963 | |
0d62e5e8 | 1964 | static int |
fa96cb38 PA |
1965 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
1966 | int *wstatp, int options) | |
0d62e5e8 | 1967 | { |
d86d4aaf | 1968 | struct thread_info *event_thread; |
d50171e4 | 1969 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 1970 | sigset_t block_mask, prev_mask; |
d50171e4 | 1971 | |
fa96cb38 | 1972 | retry: |
d86d4aaf DE |
1973 | /* N.B. event_thread points to the thread_info struct that contains |
1974 | event_child. Keep them in sync. */ | |
1975 | event_thread = NULL; | |
d50171e4 PA |
1976 | event_child = NULL; |
1977 | requested_child = NULL; | |
0d62e5e8 | 1978 | |
95954743 | 1979 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1980 | |
fa96cb38 | 1981 | if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid)) |
0d62e5e8 | 1982 | { |
d86d4aaf | 1983 | event_thread = (struct thread_info *) |
fa96cb38 | 1984 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); |
d86d4aaf DE |
1985 | if (event_thread != NULL) |
1986 | event_child = get_thread_lwp (event_thread); | |
1987 | if (debug_threads && event_thread) | |
1988 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 1989 | } |
fa96cb38 | 1990 | else if (!ptid_equal (filter_ptid, null_ptid)) |
0d62e5e8 | 1991 | { |
fa96cb38 | 1992 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 1993 | |
bde24c0a | 1994 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
1995 | && requested_child->status_pending_p |
1996 | && requested_child->collecting_fast_tracepoint) | |
1997 | { | |
1998 | enqueue_one_deferred_signal (requested_child, | |
1999 | &requested_child->status_pending); | |
2000 | requested_child->status_pending_p = 0; | |
2001 | requested_child->status_pending = 0; | |
2002 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2003 | } | |
2004 | ||
2005 | if (requested_child->suspended | |
2006 | && requested_child->status_pending_p) | |
38e08fca GB |
2007 | { |
2008 | internal_error (__FILE__, __LINE__, | |
2009 | "requesting an event out of a" | |
2010 | " suspended child?"); | |
2011 | } | |
fa593d66 | 2012 | |
d50171e4 | 2013 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2014 | { |
2015 | event_child = requested_child; | |
2016 | event_thread = get_lwp_thread (event_child); | |
2017 | } | |
0d62e5e8 | 2018 | } |
611cb4a5 | 2019 | |
0d62e5e8 DJ |
2020 | if (event_child != NULL) |
2021 | { | |
bd99dc85 | 2022 | if (debug_threads) |
87ce2a04 | 2023 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2024 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2025 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2026 | event_child->status_pending_p = 0; |
2027 | event_child->status_pending = 0; | |
0bfdf32f | 2028 | current_thread = event_thread; |
d86d4aaf | 2029 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2030 | } |
2031 | ||
fa96cb38 PA |
2032 | /* But if we don't find a pending event, we'll have to wait. |
2033 | ||
2034 | We only enter this loop if no process has a pending wait status. | |
2035 | Thus any action taken in response to a wait status inside this | |
2036 | loop is responding as soon as we detect the status, not after any | |
2037 | pending events. */ | |
d8301ad1 | 2038 | |
fa96cb38 PA |
2039 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2040 | all signals while here. */ | |
2041 | sigfillset (&block_mask); | |
2042 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2043 | ||
2044 | while (event_child == NULL) | |
0d62e5e8 | 2045 | { |
fa96cb38 | 2046 | pid_t ret = 0; |
0d62e5e8 | 2047 | |
fa96cb38 PA |
2048 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2049 | quirks: | |
0d62e5e8 | 2050 | |
fa96cb38 PA |
2051 | - If the thread group leader exits while other threads in the |
2052 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2053 | waitpid won't return an exit status until the other threads | |
2054 | in the group are reaped. | |
611cb4a5 | 2055 | |
fa96cb38 PA |
2056 | - When a non-leader thread execs, that thread just vanishes |
2057 | without reporting an exit (so we'd hang if we waited for it | |
2058 | explicitly in that case). The exec event is reported to | |
2059 | the TGID pid (although we don't currently enable exec | |
2060 | events). */ | |
2061 | errno = 0; | |
2062 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2063 | |
fa96cb38 PA |
2064 | if (debug_threads) |
2065 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2066 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2067 | |
fa96cb38 | 2068 | if (ret > 0) |
0d62e5e8 | 2069 | { |
89be2091 | 2070 | if (debug_threads) |
bd99dc85 | 2071 | { |
fa96cb38 PA |
2072 | debug_printf ("LLW: waitpid %ld received %s\n", |
2073 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2074 | } |
89be2091 | 2075 | |
fa96cb38 PA |
2076 | event_child = linux_low_filter_event (filter_ptid, |
2077 | ret, *wstatp); | |
2078 | if (event_child != NULL) | |
bd99dc85 | 2079 | { |
fa96cb38 PA |
2080 | /* We got an event to report to the core. */ |
2081 | event_thread = get_lwp_thread (event_child); | |
2082 | break; | |
bd99dc85 | 2083 | } |
89be2091 | 2084 | |
fa96cb38 PA |
2085 | /* Retry until nothing comes out of waitpid. A single |
2086 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2087 | continue; |
2088 | } | |
2089 | ||
fa96cb38 PA |
2090 | /* Check for zombie thread group leaders. Those can't be reaped |
2091 | until all other threads in the thread group are. */ | |
2092 | check_zombie_leaders (); | |
2093 | ||
2094 | /* If there are no resumed children left in the set of LWPs we | |
2095 | want to wait for, bail. We can't just block in | |
2096 | waitpid/sigsuspend, because lwps might have been left stopped | |
2097 | in trace-stop state, and we'd be stuck forever waiting for | |
2098 | their status to change (which would only happen if we resumed | |
2099 | them). Even if WNOHANG is set, this return code is preferred | |
2100 | over 0 (below), as it is more detailed. */ | |
2101 | if ((find_inferior (&all_threads, | |
2102 | not_stopped_callback, | |
2103 | &wait_ptid) == NULL)) | |
a6dbe5df | 2104 | { |
fa96cb38 PA |
2105 | if (debug_threads) |
2106 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2107 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2108 | return -1; | |
a6dbe5df PA |
2109 | } |
2110 | ||
fa96cb38 PA |
2111 | /* No interesting event to report to the caller. */ |
2112 | if ((options & WNOHANG)) | |
24a09b5f | 2113 | { |
fa96cb38 PA |
2114 | if (debug_threads) |
2115 | debug_printf ("WNOHANG set, no event found\n"); | |
2116 | ||
2117 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2118 | return 0; | |
24a09b5f DJ |
2119 | } |
2120 | ||
fa96cb38 PA |
2121 | /* Block until we get an event reported with SIGCHLD. */ |
2122 | if (debug_threads) | |
2123 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2124 | |
fa96cb38 PA |
2125 | sigsuspend (&prev_mask); |
2126 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2127 | goto retry; | |
2128 | } | |
d50171e4 | 2129 | |
fa96cb38 | 2130 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2131 | |
0bfdf32f | 2132 | current_thread = event_thread; |
d50171e4 | 2133 | |
fa96cb38 PA |
2134 | /* Check for thread exit. */ |
2135 | if (! WIFSTOPPED (*wstatp)) | |
2136 | { | |
2137 | gdb_assert (last_thread_of_process_p (pid_of (event_thread))); | |
2138 | ||
2139 | if (debug_threads) | |
2140 | debug_printf ("LWP %d is the last lwp of process. " | |
2141 | "Process %ld exiting.\n", | |
2142 | pid_of (event_thread), lwpid_of (event_thread)); | |
d86d4aaf | 2143 | return lwpid_of (event_thread); |
611cb4a5 | 2144 | } |
0d62e5e8 | 2145 | |
fa96cb38 PA |
2146 | return lwpid_of (event_thread); |
2147 | } | |
2148 | ||
2149 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2150 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2151 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2152 | the stop status through the status pointer WSTAT. OPTIONS is | |
2153 | passed to the waitpid call. Return 0 if no event was found and | |
2154 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2155 | was found. Return the PID of the stopped child otherwise. */ | |
2156 | ||
2157 | static int | |
2158 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2159 | { | |
2160 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2161 | } |
2162 | ||
6bf5e0ba PA |
2163 | /* Count the LWP's that have had events. */ |
2164 | ||
2165 | static int | |
2166 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2167 | { | |
d86d4aaf DE |
2168 | struct thread_info *thread = (struct thread_info *) entry; |
2169 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba PA |
2170 | int *count = data; |
2171 | ||
2172 | gdb_assert (count != NULL); | |
2173 | ||
2174 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
2175 | should be reported to GDB. */ | |
8336d594 PA |
2176 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2177 | && thread->last_resume_kind != resume_stop | |
c4d9ceb6 | 2178 | && lp_status_maybe_breakpoint (lp) |
6bf5e0ba PA |
2179 | && !breakpoint_inserted_here (lp->stop_pc)) |
2180 | (*count)++; | |
2181 | ||
2182 | return 0; | |
2183 | } | |
2184 | ||
2185 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2186 | ||
2187 | static int | |
2188 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2189 | { | |
d86d4aaf DE |
2190 | struct thread_info *thread = (struct thread_info *) entry; |
2191 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba | 2192 | |
8336d594 PA |
2193 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2194 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2195 | && lp->status_pending_p) |
2196 | return 1; | |
2197 | else | |
2198 | return 0; | |
2199 | } | |
2200 | ||
2201 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
2202 | reported to GDB. */ | |
2203 | ||
2204 | static int | |
2205 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2206 | { | |
d86d4aaf DE |
2207 | struct thread_info *thread = (struct thread_info *) entry; |
2208 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba PA |
2209 | int *selector = data; |
2210 | ||
2211 | gdb_assert (selector != NULL); | |
2212 | ||
2213 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
2214 | if (thread->last_resume_kind != resume_stop |
2215 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
c4d9ceb6 | 2216 | && lp_status_maybe_breakpoint (lp) |
6bf5e0ba PA |
2217 | && !breakpoint_inserted_here (lp->stop_pc)) |
2218 | if ((*selector)-- == 0) | |
2219 | return 1; | |
2220 | ||
2221 | return 0; | |
2222 | } | |
2223 | ||
2224 | static int | |
2225 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
2226 | { | |
d86d4aaf DE |
2227 | struct thread_info *thread = (struct thread_info *) entry; |
2228 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba PA |
2229 | struct lwp_info *event_lp = data; |
2230 | ||
2231 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2232 | if (lp == event_lp) | |
2233 | return 0; | |
2234 | ||
2235 | /* If a LWP other than the LWP that we're reporting an event for has | |
2236 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2237 | then just arrange for it to hit it again later. We don't keep | |
2238 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2239 | LWP. We will handle the current event, eventually we will resume | |
2240 | all LWPs, and this one will get its breakpoint trap again. | |
2241 | ||
2242 | If we do not do this, then we run the risk that the user will | |
2243 | delete or disable the breakpoint, but the LWP will have already | |
2244 | tripped on it. */ | |
2245 | ||
8336d594 PA |
2246 | if (thread->last_resume_kind != resume_stop |
2247 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
c4d9ceb6 | 2248 | && lp_status_maybe_breakpoint (lp) |
bdabb078 PA |
2249 | && !lp->stepping |
2250 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
2251 | && cancel_breakpoint (lp)) |
2252 | /* Throw away the SIGTRAP. */ | |
2253 | lp->status_pending_p = 0; | |
2254 | ||
2255 | return 0; | |
2256 | } | |
2257 | ||
7984d532 PA |
2258 | static void |
2259 | linux_cancel_breakpoints (void) | |
2260 | { | |
d86d4aaf | 2261 | find_inferior (&all_threads, cancel_breakpoints_callback, NULL); |
7984d532 PA |
2262 | } |
2263 | ||
6bf5e0ba PA |
2264 | /* Select one LWP out of those that have events pending. */ |
2265 | ||
2266 | static void | |
2267 | select_event_lwp (struct lwp_info **orig_lp) | |
2268 | { | |
2269 | int num_events = 0; | |
2270 | int random_selector; | |
d86d4aaf | 2271 | struct thread_info *event_thread; |
6bf5e0ba PA |
2272 | |
2273 | /* Give preference to any LWP that is being single-stepped. */ | |
d86d4aaf DE |
2274 | event_thread |
2275 | = (struct thread_info *) find_inferior (&all_threads, | |
2276 | select_singlestep_lwp_callback, | |
2277 | NULL); | |
2278 | if (event_thread != NULL) | |
6bf5e0ba PA |
2279 | { |
2280 | if (debug_threads) | |
87ce2a04 | 2281 | debug_printf ("SEL: Select single-step %s\n", |
d86d4aaf | 2282 | target_pid_to_str (ptid_of (event_thread))); |
6bf5e0ba PA |
2283 | } |
2284 | else | |
2285 | { | |
2286 | /* No single-stepping LWP. Select one at random, out of those | |
2287 | which have had SIGTRAP events. */ | |
2288 | ||
2289 | /* First see how many SIGTRAP events we have. */ | |
d86d4aaf | 2290 | find_inferior (&all_threads, count_events_callback, &num_events); |
6bf5e0ba PA |
2291 | |
2292 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2293 | random_selector = (int) | |
2294 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2295 | ||
2296 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2297 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2298 | num_events, random_selector); | |
6bf5e0ba | 2299 | |
d86d4aaf DE |
2300 | event_thread |
2301 | = (struct thread_info *) find_inferior (&all_threads, | |
2302 | select_event_lwp_callback, | |
2303 | &random_selector); | |
6bf5e0ba PA |
2304 | } |
2305 | ||
d86d4aaf | 2306 | if (event_thread != NULL) |
6bf5e0ba | 2307 | { |
d86d4aaf DE |
2308 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2309 | ||
6bf5e0ba PA |
2310 | /* Switch the event LWP. */ |
2311 | *orig_lp = event_lp; | |
2312 | } | |
2313 | } | |
2314 | ||
7984d532 PA |
2315 | /* Decrement the suspend count of an LWP. */ |
2316 | ||
2317 | static int | |
2318 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2319 | { | |
d86d4aaf DE |
2320 | struct thread_info *thread = (struct thread_info *) entry; |
2321 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
2322 | |
2323 | /* Ignore EXCEPT. */ | |
2324 | if (lwp == except) | |
2325 | return 0; | |
2326 | ||
2327 | lwp->suspended--; | |
2328 | ||
2329 | gdb_assert (lwp->suspended >= 0); | |
2330 | return 0; | |
2331 | } | |
2332 | ||
2333 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2334 | NULL. */ | |
2335 | ||
2336 | static void | |
2337 | unsuspend_all_lwps (struct lwp_info *except) | |
2338 | { | |
d86d4aaf | 2339 | find_inferior (&all_threads, unsuspend_one_lwp, except); |
7984d532 PA |
2340 | } |
2341 | ||
fa593d66 PA |
2342 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2343 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2344 | void *data); | |
2345 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2346 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2347 | struct target_waitstatus *ourstatus, | |
2348 | int target_options); | |
2349 | ||
2350 | /* Stabilize threads (move out of jump pads). | |
2351 | ||
2352 | If a thread is midway collecting a fast tracepoint, we need to | |
2353 | finish the collection and move it out of the jump pad before | |
2354 | reporting the signal. | |
2355 | ||
2356 | This avoids recursion while collecting (when a signal arrives | |
2357 | midway, and the signal handler itself collects), which would trash | |
2358 | the trace buffer. In case the user set a breakpoint in a signal | |
2359 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2360 | Most importantly, there are certain things we can't do safely if | |
2361 | threads are stopped in a jump pad (or in its callee's). For | |
2362 | example: | |
2363 | ||
2364 | - starting a new trace run. A thread still collecting the | |
2365 | previous run, could trash the trace buffer when resumed. The trace | |
2366 | buffer control structures would have been reset but the thread had | |
2367 | no way to tell. The thread could even midway memcpy'ing to the | |
2368 | buffer, which would mean that when resumed, it would clobber the | |
2369 | trace buffer that had been set for a new run. | |
2370 | ||
2371 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2372 | safely. Say you do tstart while a thread is stopped midway while | |
2373 | collecting. When the thread is later resumed, it finishes the | |
2374 | collection, and returns to the jump pad, to execute the original | |
2375 | instruction that was under the tracepoint jump at the time the | |
2376 | older run had been started. If the jump pad had been rewritten | |
2377 | since for something else in the new run, the thread would now | |
2378 | execute the wrong / random instructions. */ | |
2379 | ||
2380 | static void | |
2381 | linux_stabilize_threads (void) | |
2382 | { | |
0bfdf32f | 2383 | struct thread_info *saved_thread; |
d86d4aaf | 2384 | struct thread_info *thread_stuck; |
fa593d66 | 2385 | |
d86d4aaf DE |
2386 | thread_stuck |
2387 | = (struct thread_info *) find_inferior (&all_threads, | |
2388 | stuck_in_jump_pad_callback, | |
2389 | NULL); | |
2390 | if (thread_stuck != NULL) | |
fa593d66 | 2391 | { |
b4d51a55 | 2392 | if (debug_threads) |
87ce2a04 | 2393 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2394 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2395 | return; |
2396 | } | |
2397 | ||
0bfdf32f | 2398 | saved_thread = current_thread; |
fa593d66 PA |
2399 | |
2400 | stabilizing_threads = 1; | |
2401 | ||
2402 | /* Kick 'em all. */ | |
d86d4aaf | 2403 | for_each_inferior (&all_threads, move_out_of_jump_pad_callback); |
fa593d66 PA |
2404 | |
2405 | /* Loop until all are stopped out of the jump pads. */ | |
d86d4aaf | 2406 | while (find_inferior (&all_threads, lwp_running, NULL) != NULL) |
fa593d66 PA |
2407 | { |
2408 | struct target_waitstatus ourstatus; | |
2409 | struct lwp_info *lwp; | |
fa593d66 PA |
2410 | int wstat; |
2411 | ||
2412 | /* Note that we go through the full wait even loop. While | |
2413 | moving threads out of jump pad, we need to be able to step | |
2414 | over internal breakpoints and such. */ | |
32fcada3 | 2415 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2416 | |
2417 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2418 | { | |
0bfdf32f | 2419 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2420 | |
2421 | /* Lock it. */ | |
2422 | lwp->suspended++; | |
2423 | ||
a493e3e2 | 2424 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2425 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2426 | { |
2ea28649 | 2427 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2428 | enqueue_one_deferred_signal (lwp, &wstat); |
2429 | } | |
2430 | } | |
2431 | } | |
2432 | ||
d86d4aaf | 2433 | find_inferior (&all_threads, unsuspend_one_lwp, NULL); |
fa593d66 PA |
2434 | |
2435 | stabilizing_threads = 0; | |
2436 | ||
0bfdf32f | 2437 | current_thread = saved_thread; |
fa593d66 | 2438 | |
b4d51a55 | 2439 | if (debug_threads) |
fa593d66 | 2440 | { |
d86d4aaf DE |
2441 | thread_stuck |
2442 | = (struct thread_info *) find_inferior (&all_threads, | |
2443 | stuck_in_jump_pad_callback, | |
2444 | NULL); | |
2445 | if (thread_stuck != NULL) | |
87ce2a04 | 2446 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2447 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2448 | } |
2449 | } | |
2450 | ||
0d62e5e8 | 2451 | /* Wait for process, returns status. */ |
da6d8c04 | 2452 | |
95954743 PA |
2453 | static ptid_t |
2454 | linux_wait_1 (ptid_t ptid, | |
2455 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2456 | { |
e5f1222d | 2457 | int w; |
fc7238bb | 2458 | struct lwp_info *event_child; |
bd99dc85 | 2459 | int options; |
bd99dc85 | 2460 | int pid; |
6bf5e0ba PA |
2461 | int step_over_finished; |
2462 | int bp_explains_trap; | |
2463 | int maybe_internal_trap; | |
2464 | int report_to_gdb; | |
219f2f23 | 2465 | int trace_event; |
c2d6af84 | 2466 | int in_step_range; |
bd99dc85 | 2467 | |
87ce2a04 DE |
2468 | if (debug_threads) |
2469 | { | |
2470 | debug_enter (); | |
2471 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
2472 | } | |
2473 | ||
bd99dc85 PA |
2474 | /* Translate generic target options into linux options. */ |
2475 | options = __WALL; | |
2476 | if (target_options & TARGET_WNOHANG) | |
2477 | options |= WNOHANG; | |
0d62e5e8 DJ |
2478 | |
2479 | retry: | |
fa593d66 PA |
2480 | bp_explains_trap = 0; |
2481 | trace_event = 0; | |
c2d6af84 | 2482 | in_step_range = 0; |
bd99dc85 PA |
2483 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2484 | ||
6bf5e0ba PA |
2485 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2486 | pid = linux_wait_for_event (ptid, &w, options); | |
2487 | else | |
2488 | { | |
2489 | if (debug_threads) | |
87ce2a04 DE |
2490 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
2491 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
2492 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
2493 | } | |
2494 | ||
fa96cb38 | 2495 | if (pid == 0) |
87ce2a04 | 2496 | { |
fa96cb38 PA |
2497 | gdb_assert (target_options & TARGET_WNOHANG); |
2498 | ||
87ce2a04 DE |
2499 | if (debug_threads) |
2500 | { | |
fa96cb38 PA |
2501 | debug_printf ("linux_wait_1 ret = null_ptid, " |
2502 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
2503 | debug_exit (); |
2504 | } | |
fa96cb38 PA |
2505 | |
2506 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
2507 | return null_ptid; |
2508 | } | |
fa96cb38 PA |
2509 | else if (pid == -1) |
2510 | { | |
2511 | if (debug_threads) | |
2512 | { | |
2513 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
2514 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
2515 | debug_exit (); | |
2516 | } | |
bd99dc85 | 2517 | |
fa96cb38 PA |
2518 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
2519 | return null_ptid; | |
2520 | } | |
0d62e5e8 | 2521 | |
0bfdf32f | 2522 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 2523 | |
fa96cb38 PA |
2524 | /* linux_wait_for_event only returns an exit status for the last |
2525 | child of a process. Report it. */ | |
2526 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 2527 | { |
fa96cb38 | 2528 | if (WIFEXITED (w)) |
0d62e5e8 | 2529 | { |
fa96cb38 PA |
2530 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
2531 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 2532 | |
fa96cb38 | 2533 | if (debug_threads) |
bd99dc85 | 2534 | { |
fa96cb38 PA |
2535 | debug_printf ("linux_wait_1 ret = %s, exited with " |
2536 | "retcode %d\n", | |
0bfdf32f | 2537 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2538 | WEXITSTATUS (w)); |
2539 | debug_exit (); | |
bd99dc85 | 2540 | } |
fa96cb38 PA |
2541 | } |
2542 | else | |
2543 | { | |
2544 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2545 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 2546 | |
fa96cb38 PA |
2547 | if (debug_threads) |
2548 | { | |
2549 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
2550 | "signal %d\n", | |
0bfdf32f | 2551 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2552 | WTERMSIG (w)); |
2553 | debug_exit (); | |
2554 | } | |
0d62e5e8 | 2555 | } |
fa96cb38 | 2556 | |
0bfdf32f | 2557 | return ptid_of (current_thread); |
da6d8c04 DJ |
2558 | } |
2559 | ||
6bf5e0ba PA |
2560 | /* If this event was not handled before, and is not a SIGTRAP, we |
2561 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2562 | a breakpoint is inserted at the current PC. If this target does | |
2563 | not support internal breakpoints at all, we also report the | |
2564 | SIGTRAP without further processing; it's of no concern to us. */ | |
2565 | maybe_internal_trap | |
2566 | = (supports_breakpoints () | |
2567 | && (WSTOPSIG (w) == SIGTRAP | |
2568 | || ((WSTOPSIG (w) == SIGILL | |
2569 | || WSTOPSIG (w) == SIGSEGV) | |
2570 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2571 | ||
2572 | if (maybe_internal_trap) | |
2573 | { | |
2574 | /* Handle anything that requires bookkeeping before deciding to | |
2575 | report the event or continue waiting. */ | |
2576 | ||
2577 | /* First check if we can explain the SIGTRAP with an internal | |
2578 | breakpoint, or if we should possibly report the event to GDB. | |
2579 | Do this before anything that may remove or insert a | |
2580 | breakpoint. */ | |
2581 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2582 | ||
2583 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2584 | finished. If so, tweak the state machine accordingly, | |
2585 | reinsert breakpoints and delete any reinsert (software | |
2586 | single-step) breakpoints. */ | |
2587 | step_over_finished = finish_step_over (event_child); | |
2588 | ||
2589 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2590 | check_breakpoints (event_child->stop_pc); | |
2591 | ||
219f2f23 PA |
2592 | /* Handle tracepoint data collecting. This may overflow the |
2593 | trace buffer, and cause a tracing stop, removing | |
2594 | breakpoints. */ | |
2595 | trace_event = handle_tracepoints (event_child); | |
2596 | ||
6bf5e0ba PA |
2597 | if (bp_explains_trap) |
2598 | { | |
2599 | /* If we stepped or ran into an internal breakpoint, we've | |
2600 | already handled it. So next time we resume (from this | |
2601 | PC), we should step over it. */ | |
2602 | if (debug_threads) | |
87ce2a04 | 2603 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2604 | |
8b07ae33 PA |
2605 | if (breakpoint_here (event_child->stop_pc)) |
2606 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2607 | } |
2608 | } | |
2609 | else | |
2610 | { | |
2611 | /* We have some other signal, possibly a step-over dance was in | |
2612 | progress, and it should be cancelled too. */ | |
2613 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2614 | } |
2615 | ||
2616 | /* We have all the data we need. Either report the event to GDB, or | |
2617 | resume threads and keep waiting for more. */ | |
2618 | ||
2619 | /* If we're collecting a fast tracepoint, finish the collection and | |
2620 | move out of the jump pad before delivering a signal. See | |
2621 | linux_stabilize_threads. */ | |
2622 | ||
2623 | if (WIFSTOPPED (w) | |
2624 | && WSTOPSIG (w) != SIGTRAP | |
2625 | && supports_fast_tracepoints () | |
58b4daa5 | 2626 | && agent_loaded_p ()) |
fa593d66 PA |
2627 | { |
2628 | if (debug_threads) | |
87ce2a04 DE |
2629 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
2630 | "to defer or adjust it.\n", | |
0bfdf32f | 2631 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
2632 | |
2633 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 2634 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
2635 | && maybe_move_out_of_jump_pad (event_child, &w)) |
2636 | { | |
2637 | enqueue_one_deferred_signal (event_child, &w); | |
2638 | ||
2639 | if (debug_threads) | |
87ce2a04 | 2640 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 2641 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
2642 | |
2643 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
2644 | goto retry; | |
2645 | } | |
2646 | } | |
219f2f23 | 2647 | |
fa593d66 PA |
2648 | if (event_child->collecting_fast_tracepoint) |
2649 | { | |
2650 | if (debug_threads) | |
87ce2a04 DE |
2651 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
2652 | "Check if we're already there.\n", | |
0bfdf32f | 2653 | lwpid_of (current_thread), |
87ce2a04 | 2654 | event_child->collecting_fast_tracepoint); |
fa593d66 PA |
2655 | |
2656 | trace_event = 1; | |
2657 | ||
2658 | event_child->collecting_fast_tracepoint | |
2659 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2660 | ||
2661 | if (event_child->collecting_fast_tracepoint != 1) | |
2662 | { | |
2663 | /* No longer need this breakpoint. */ | |
2664 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2665 | { | |
2666 | if (debug_threads) | |
87ce2a04 DE |
2667 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
2668 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2669 | |
2670 | /* Other running threads could hit this breakpoint. | |
2671 | We don't handle moribund locations like GDB does, | |
2672 | instead we always pause all threads when removing | |
2673 | breakpoints, so that any step-over or | |
2674 | decr_pc_after_break adjustment is always taken | |
2675 | care of while the breakpoint is still | |
2676 | inserted. */ | |
2677 | stop_all_lwps (1, event_child); | |
2678 | cancel_breakpoints (); | |
2679 | ||
2680 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2681 | event_child->exit_jump_pad_bkpt = NULL; | |
2682 | ||
2683 | unstop_all_lwps (1, event_child); | |
2684 | ||
2685 | gdb_assert (event_child->suspended >= 0); | |
2686 | } | |
2687 | } | |
2688 | ||
2689 | if (event_child->collecting_fast_tracepoint == 0) | |
2690 | { | |
2691 | if (debug_threads) | |
87ce2a04 DE |
2692 | debug_printf ("fast tracepoint finished " |
2693 | "collecting successfully.\n"); | |
fa593d66 PA |
2694 | |
2695 | /* We may have a deferred signal to report. */ | |
2696 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2697 | { | |
2698 | if (debug_threads) | |
87ce2a04 | 2699 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 2700 | } |
3c11dd79 | 2701 | else |
fa593d66 | 2702 | { |
3c11dd79 | 2703 | if (debug_threads) |
87ce2a04 | 2704 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
2705 | |
2706 | if (stabilizing_threads) | |
2707 | { | |
2708 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 2709 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
2710 | |
2711 | if (debug_threads) | |
2712 | { | |
2713 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
2714 | "while stabilizing threads\n", | |
0bfdf32f | 2715 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
2716 | debug_exit (); |
2717 | } | |
2718 | ||
0bfdf32f | 2719 | return ptid_of (current_thread); |
fa593d66 PA |
2720 | } |
2721 | } | |
2722 | } | |
6bf5e0ba PA |
2723 | } |
2724 | ||
e471f25b PA |
2725 | /* Check whether GDB would be interested in this event. */ |
2726 | ||
2727 | /* If GDB is not interested in this signal, don't stop other | |
2728 | threads, and don't report it to GDB. Just resume the inferior | |
2729 | right away. We do this for threading-related signals as well as | |
2730 | any that GDB specifically requested we ignore. But never ignore | |
2731 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2732 | stepping - they may require special handling to skip the signal | |
2733 | handler. */ | |
2734 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2735 | thread library? */ | |
2736 | if (WIFSTOPPED (w) | |
0bfdf32f | 2737 | && current_thread->last_resume_kind != resume_step |
e471f25b | 2738 | && ( |
1a981360 | 2739 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2740 | (current_process ()->private->thread_db != NULL |
2741 | && (WSTOPSIG (w) == __SIGRTMIN | |
2742 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2743 | || | |
2744 | #endif | |
2ea28649 | 2745 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 2746 | && !(WSTOPSIG (w) == SIGSTOP |
0bfdf32f | 2747 | && current_thread->last_resume_kind == resume_stop)))) |
e471f25b PA |
2748 | { |
2749 | siginfo_t info, *info_p; | |
2750 | ||
2751 | if (debug_threads) | |
87ce2a04 | 2752 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 2753 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 2754 | |
0bfdf32f | 2755 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2756 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
2757 | info_p = &info; |
2758 | else | |
2759 | info_p = NULL; | |
2760 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2761 | WSTOPSIG (w), info_p); | |
2762 | goto retry; | |
2763 | } | |
2764 | ||
c2d6af84 PA |
2765 | /* Note that all addresses are always "out of the step range" when |
2766 | there's no range to begin with. */ | |
2767 | in_step_range = lwp_in_step_range (event_child); | |
2768 | ||
2769 | /* If GDB wanted this thread to single step, and the thread is out | |
2770 | of the step range, we always want to report the SIGTRAP, and let | |
2771 | GDB handle it. Watchpoints should always be reported. So should | |
2772 | signals we can't explain. A SIGTRAP we can't explain could be a | |
2773 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
2774 | do, we're be able to handle GDB breakpoints on top of internal | |
2775 | breakpoints, by handling the internal breakpoint and still | |
2776 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
2777 | won't see the breakpoint hit. */ | |
6bf5e0ba | 2778 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 2779 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 2780 | && !in_step_range) |
6bf5e0ba | 2781 | || event_child->stopped_by_watchpoint |
c2d6af84 | 2782 | || (!step_over_finished && !in_step_range |
493e2a69 | 2783 | && !bp_explains_trap && !trace_event) |
9f3a5c85 | 2784 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 SS |
2785 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
2786 | && gdb_no_commands_at_breakpoint (event_child->stop_pc))); | |
2787 | ||
2788 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
2789 | |
2790 | /* We found no reason GDB would want us to stop. We either hit one | |
2791 | of our own breakpoints, or finished an internal step GDB | |
2792 | shouldn't know about. */ | |
2793 | if (!report_to_gdb) | |
2794 | { | |
2795 | if (debug_threads) | |
2796 | { | |
2797 | if (bp_explains_trap) | |
87ce2a04 | 2798 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2799 | if (step_over_finished) |
87ce2a04 | 2800 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 2801 | if (trace_event) |
87ce2a04 | 2802 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 2803 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
2804 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
2805 | paddress (event_child->stop_pc), | |
2806 | paddress (event_child->step_range_start), | |
2807 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
2808 | } |
2809 | ||
2810 | /* We're not reporting this breakpoint to GDB, so apply the | |
2811 | decr_pc_after_break adjustment to the inferior's regcache | |
2812 | ourselves. */ | |
2813 | ||
2814 | if (the_low_target.set_pc != NULL) | |
2815 | { | |
2816 | struct regcache *regcache | |
0bfdf32f | 2817 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
2818 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
2819 | } | |
2820 | ||
7984d532 PA |
2821 | /* We may have finished stepping over a breakpoint. If so, |
2822 | we've stopped and suspended all LWPs momentarily except the | |
2823 | stepping one. This is where we resume them all again. We're | |
2824 | going to keep waiting, so use proceed, which handles stepping | |
2825 | over the next breakpoint. */ | |
6bf5e0ba | 2826 | if (debug_threads) |
87ce2a04 | 2827 | debug_printf ("proceeding all threads.\n"); |
7984d532 PA |
2828 | |
2829 | if (step_over_finished) | |
2830 | unsuspend_all_lwps (event_child); | |
2831 | ||
6bf5e0ba PA |
2832 | proceed_all_lwps (); |
2833 | goto retry; | |
2834 | } | |
2835 | ||
2836 | if (debug_threads) | |
2837 | { | |
0bfdf32f | 2838 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
2839 | { |
2840 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 2841 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 2842 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 2843 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 2844 | } |
6bf5e0ba | 2845 | if (event_child->stopped_by_watchpoint) |
87ce2a04 | 2846 | debug_printf ("Stopped by watchpoint.\n"); |
8b07ae33 | 2847 | if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 2848 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 2849 | if (debug_threads) |
87ce2a04 | 2850 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
2851 | } |
2852 | ||
2853 | /* Alright, we're going to report a stop. */ | |
2854 | ||
fa593d66 | 2855 | if (!non_stop && !stabilizing_threads) |
6bf5e0ba PA |
2856 | { |
2857 | /* In all-stop, stop all threads. */ | |
7984d532 | 2858 | stop_all_lwps (0, NULL); |
6bf5e0ba PA |
2859 | |
2860 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2861 | from among those that have had events. Giving equal priority | |
2862 | to all LWPs that have had events helps prevent | |
2863 | starvation. */ | |
2864 | if (ptid_equal (ptid, minus_one_ptid)) | |
2865 | { | |
2866 | event_child->status_pending_p = 1; | |
2867 | event_child->status_pending = w; | |
2868 | ||
2869 | select_event_lwp (&event_child); | |
2870 | ||
0bfdf32f GB |
2871 | /* current_thread and event_child must stay in sync. */ |
2872 | current_thread = get_lwp_thread (event_child); | |
ee1e2d4f | 2873 | |
6bf5e0ba PA |
2874 | event_child->status_pending_p = 0; |
2875 | w = event_child->status_pending; | |
2876 | } | |
2877 | ||
2878 | /* Now that we've selected our final event LWP, cancel any | |
2879 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
2880 | See the comment in cancel_breakpoints_callback to find out | |
2881 | why. */ | |
d86d4aaf | 2882 | find_inferior (&all_threads, cancel_breakpoints_callback, event_child); |
fa593d66 | 2883 | |
c03e6ccc YQ |
2884 | /* If we were going a step-over, all other threads but the stepping one |
2885 | had been paused in start_step_over, with their suspend counts | |
2886 | incremented. We don't want to do a full unstop/unpause, because we're | |
2887 | in all-stop mode (so we want threads stopped), but we still need to | |
2888 | unsuspend the other threads, to decrement their `suspended' count | |
2889 | back. */ | |
2890 | if (step_over_finished) | |
2891 | unsuspend_all_lwps (event_child); | |
2892 | ||
fa593d66 PA |
2893 | /* Stabilize threads (move out of jump pads). */ |
2894 | stabilize_threads (); | |
6bf5e0ba PA |
2895 | } |
2896 | else | |
2897 | { | |
2898 | /* If we just finished a step-over, then all threads had been | |
2899 | momentarily paused. In all-stop, that's fine, we want | |
2900 | threads stopped by now anyway. In non-stop, we need to | |
2901 | re-resume threads that GDB wanted to be running. */ | |
2902 | if (step_over_finished) | |
7984d532 | 2903 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2904 | } |
2905 | ||
5b1c542e | 2906 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2907 | |
0bfdf32f | 2908 | if (current_thread->last_resume_kind == resume_stop |
8336d594 | 2909 | && WSTOPSIG (w) == SIGSTOP) |
bd99dc85 PA |
2910 | { |
2911 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2912 | and it stopped cleanly, so report as SIG0. The use of | |
2913 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 2914 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 2915 | } |
0bfdf32f | 2916 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 2917 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
2918 | { |
2919 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2920 | but, it stopped for other reasons. */ |
2ea28649 | 2921 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2922 | } |
2923 | else | |
2924 | { | |
2ea28649 | 2925 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2926 | } |
2927 | ||
d50171e4 PA |
2928 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2929 | ||
bd99dc85 | 2930 | if (debug_threads) |
87ce2a04 DE |
2931 | { |
2932 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
0bfdf32f | 2933 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
2934 | ourstatus->kind, ourstatus->value.sig); |
2935 | debug_exit (); | |
2936 | } | |
bd99dc85 | 2937 | |
0bfdf32f | 2938 | return ptid_of (current_thread); |
bd99dc85 PA |
2939 | } |
2940 | ||
2941 | /* Get rid of any pending event in the pipe. */ | |
2942 | static void | |
2943 | async_file_flush (void) | |
2944 | { | |
2945 | int ret; | |
2946 | char buf; | |
2947 | ||
2948 | do | |
2949 | ret = read (linux_event_pipe[0], &buf, 1); | |
2950 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2951 | } | |
2952 | ||
2953 | /* Put something in the pipe, so the event loop wakes up. */ | |
2954 | static void | |
2955 | async_file_mark (void) | |
2956 | { | |
2957 | int ret; | |
2958 | ||
2959 | async_file_flush (); | |
2960 | ||
2961 | do | |
2962 | ret = write (linux_event_pipe[1], "+", 1); | |
2963 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2964 | ||
2965 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
2966 | be awakened anyway. */ | |
2967 | } | |
2968 | ||
95954743 PA |
2969 | static ptid_t |
2970 | linux_wait (ptid_t ptid, | |
2971 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 2972 | { |
95954743 | 2973 | ptid_t event_ptid; |
bd99dc85 | 2974 | |
bd99dc85 PA |
2975 | /* Flush the async file first. */ |
2976 | if (target_is_async_p ()) | |
2977 | async_file_flush (); | |
2978 | ||
95954743 | 2979 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
2980 | |
2981 | /* If at least one stop was reported, there may be more. A single | |
2982 | SIGCHLD can signal more than one child stop. */ | |
2983 | if (target_is_async_p () | |
2984 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 2985 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
2986 | async_file_mark (); |
2987 | ||
2988 | return event_ptid; | |
da6d8c04 DJ |
2989 | } |
2990 | ||
c5f62d5f | 2991 | /* Send a signal to an LWP. */ |
fd500816 DJ |
2992 | |
2993 | static int | |
a1928bad | 2994 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 2995 | { |
c5f62d5f DE |
2996 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2997 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 2998 | |
c5f62d5f DE |
2999 | #ifdef __NR_tkill |
3000 | { | |
3001 | static int tkill_failed; | |
fd500816 | 3002 | |
c5f62d5f DE |
3003 | if (!tkill_failed) |
3004 | { | |
3005 | int ret; | |
3006 | ||
3007 | errno = 0; | |
3008 | ret = syscall (__NR_tkill, lwpid, signo); | |
3009 | if (errno != ENOSYS) | |
3010 | return ret; | |
3011 | tkill_failed = 1; | |
3012 | } | |
3013 | } | |
fd500816 DJ |
3014 | #endif |
3015 | ||
3016 | return kill (lwpid, signo); | |
3017 | } | |
3018 | ||
964e4306 PA |
3019 | void |
3020 | linux_stop_lwp (struct lwp_info *lwp) | |
3021 | { | |
3022 | send_sigstop (lwp); | |
3023 | } | |
3024 | ||
0d62e5e8 | 3025 | static void |
02fc4de7 | 3026 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3027 | { |
bd99dc85 | 3028 | int pid; |
0d62e5e8 | 3029 | |
d86d4aaf | 3030 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3031 | |
0d62e5e8 DJ |
3032 | /* If we already have a pending stop signal for this process, don't |
3033 | send another. */ | |
54a0b537 | 3034 | if (lwp->stop_expected) |
0d62e5e8 | 3035 | { |
ae13219e | 3036 | if (debug_threads) |
87ce2a04 | 3037 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3038 | |
0d62e5e8 DJ |
3039 | return; |
3040 | } | |
3041 | ||
3042 | if (debug_threads) | |
87ce2a04 | 3043 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3044 | |
d50171e4 | 3045 | lwp->stop_expected = 1; |
bd99dc85 | 3046 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3047 | } |
3048 | ||
7984d532 PA |
3049 | static int |
3050 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 | 3051 | { |
d86d4aaf DE |
3052 | struct thread_info *thread = (struct thread_info *) entry; |
3053 | struct lwp_info *lwp = get_thread_lwp (thread); | |
02fc4de7 | 3054 | |
7984d532 PA |
3055 | /* Ignore EXCEPT. */ |
3056 | if (lwp == except) | |
3057 | return 0; | |
3058 | ||
02fc4de7 | 3059 | if (lwp->stopped) |
7984d532 | 3060 | return 0; |
02fc4de7 PA |
3061 | |
3062 | send_sigstop (lwp); | |
7984d532 PA |
3063 | return 0; |
3064 | } | |
3065 | ||
3066 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3067 | yet. */ | |
3068 | static int | |
3069 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
3070 | void *except) | |
3071 | { | |
d86d4aaf DE |
3072 | struct thread_info *thread = (struct thread_info *) entry; |
3073 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
3074 | |
3075 | /* Ignore EXCEPT. */ | |
3076 | if (lwp == except) | |
3077 | return 0; | |
3078 | ||
3079 | lwp->suspended++; | |
3080 | ||
3081 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
3082 | } |
3083 | ||
95954743 PA |
3084 | static void |
3085 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3086 | { | |
3087 | /* It's dead, really. */ | |
3088 | lwp->dead = 1; | |
3089 | ||
3090 | /* Store the exit status for later. */ | |
3091 | lwp->status_pending_p = 1; | |
3092 | lwp->status_pending = wstat; | |
3093 | ||
95954743 PA |
3094 | /* Prevent trying to stop it. */ |
3095 | lwp->stopped = 1; | |
3096 | ||
3097 | /* No further stops are expected from a dead lwp. */ | |
3098 | lwp->stop_expected = 0; | |
3099 | } | |
3100 | ||
fa96cb38 PA |
3101 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
3102 | ||
0d62e5e8 | 3103 | static void |
fa96cb38 | 3104 | wait_for_sigstop (void) |
0d62e5e8 | 3105 | { |
0bfdf32f | 3106 | struct thread_info *saved_thread; |
95954743 | 3107 | ptid_t saved_tid; |
fa96cb38 PA |
3108 | int wstat; |
3109 | int ret; | |
0d62e5e8 | 3110 | |
0bfdf32f GB |
3111 | saved_thread = current_thread; |
3112 | if (saved_thread != NULL) | |
3113 | saved_tid = saved_thread->entry.id; | |
bd99dc85 | 3114 | else |
95954743 | 3115 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3116 | |
d50171e4 | 3117 | if (debug_threads) |
fa96cb38 | 3118 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3119 | |
fa96cb38 PA |
3120 | /* Passing NULL_PTID as filter indicates we want all events to be |
3121 | left pending. Eventually this returns when there are no | |
3122 | unwaited-for children left. */ | |
3123 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
3124 | &wstat, __WALL); | |
3125 | gdb_assert (ret == -1); | |
0d62e5e8 | 3126 | |
0bfdf32f GB |
3127 | if (saved_thread == NULL || linux_thread_alive (saved_tid)) |
3128 | current_thread = saved_thread; | |
0d62e5e8 DJ |
3129 | else |
3130 | { | |
3131 | if (debug_threads) | |
87ce2a04 | 3132 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3133 | |
bd99dc85 PA |
3134 | if (non_stop) |
3135 | { | |
3136 | /* We can't change the current inferior behind GDB's back, | |
3137 | otherwise, a subsequent command may apply to the wrong | |
3138 | process. */ | |
0bfdf32f | 3139 | current_thread = NULL; |
bd99dc85 PA |
3140 | } |
3141 | else | |
3142 | { | |
3143 | /* Set a valid thread as current. */ | |
0bfdf32f | 3144 | set_desired_thread (0); |
bd99dc85 | 3145 | } |
0d62e5e8 DJ |
3146 | } |
3147 | } | |
3148 | ||
fa593d66 PA |
3149 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3150 | move it out, because we need to report the stop event to GDB. For | |
3151 | example, if the user puts a breakpoint in the jump pad, it's | |
3152 | because she wants to debug it. */ | |
3153 | ||
3154 | static int | |
3155 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3156 | { | |
d86d4aaf DE |
3157 | struct thread_info *thread = (struct thread_info *) entry; |
3158 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3159 | |
3160 | gdb_assert (lwp->suspended == 0); | |
3161 | gdb_assert (lwp->stopped); | |
3162 | ||
3163 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3164 | return (supports_fast_tracepoints () | |
58b4daa5 | 3165 | && agent_loaded_p () |
fa593d66 PA |
3166 | && (gdb_breakpoint_here (lwp->stop_pc) |
3167 | || lwp->stopped_by_watchpoint | |
3168 | || thread->last_resume_kind == resume_step) | |
3169 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3170 | } | |
3171 | ||
3172 | static void | |
3173 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3174 | { | |
d86d4aaf DE |
3175 | struct thread_info *thread = (struct thread_info *) entry; |
3176 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3177 | int *wstat; |
3178 | ||
3179 | gdb_assert (lwp->suspended == 0); | |
3180 | gdb_assert (lwp->stopped); | |
3181 | ||
3182 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3183 | ||
3184 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3185 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
3186 | && !lwp->stopped_by_watchpoint | |
3187 | && thread->last_resume_kind != resume_step | |
3188 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3189 | { | |
3190 | if (debug_threads) | |
87ce2a04 | 3191 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3192 | lwpid_of (thread)); |
fa593d66 PA |
3193 | |
3194 | if (wstat) | |
3195 | { | |
3196 | lwp->status_pending_p = 0; | |
3197 | enqueue_one_deferred_signal (lwp, wstat); | |
3198 | ||
3199 | if (debug_threads) | |
87ce2a04 DE |
3200 | debug_printf ("Signal %d for LWP %ld deferred " |
3201 | "(in jump pad)\n", | |
d86d4aaf | 3202 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
3203 | } |
3204 | ||
3205 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3206 | } | |
3207 | else | |
3208 | lwp->suspended++; | |
3209 | } | |
3210 | ||
3211 | static int | |
3212 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3213 | { | |
d86d4aaf DE |
3214 | struct thread_info *thread = (struct thread_info *) entry; |
3215 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3216 | |
3217 | if (lwp->dead) | |
3218 | return 0; | |
3219 | if (lwp->stopped) | |
3220 | return 0; | |
3221 | return 1; | |
3222 | } | |
3223 | ||
7984d532 PA |
3224 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3225 | If SUSPEND, then also increase the suspend count of every LWP, | |
3226 | except EXCEPT. */ | |
3227 | ||
0d62e5e8 | 3228 | static void |
7984d532 | 3229 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3230 | { |
bde24c0a PA |
3231 | /* Should not be called recursively. */ |
3232 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3233 | ||
87ce2a04 DE |
3234 | if (debug_threads) |
3235 | { | |
3236 | debug_enter (); | |
3237 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
3238 | suspend ? "stop-and-suspend" : "stop", | |
3239 | except != NULL | |
d86d4aaf | 3240 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
3241 | : "none"); |
3242 | } | |
3243 | ||
bde24c0a PA |
3244 | stopping_threads = (suspend |
3245 | ? STOPPING_AND_SUSPENDING_THREADS | |
3246 | : STOPPING_THREADS); | |
7984d532 PA |
3247 | |
3248 | if (suspend) | |
d86d4aaf | 3249 | find_inferior (&all_threads, suspend_and_send_sigstop_callback, except); |
7984d532 | 3250 | else |
d86d4aaf | 3251 | find_inferior (&all_threads, send_sigstop_callback, except); |
fa96cb38 | 3252 | wait_for_sigstop (); |
bde24c0a | 3253 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
3254 | |
3255 | if (debug_threads) | |
3256 | { | |
3257 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
3258 | "back to !stopping\n"); | |
3259 | debug_exit (); | |
3260 | } | |
0d62e5e8 DJ |
3261 | } |
3262 | ||
da6d8c04 DJ |
3263 | /* Resume execution of the inferior process. |
3264 | If STEP is nonzero, single-step it. | |
3265 | If SIGNAL is nonzero, give it that signal. */ | |
3266 | ||
ce3a066d | 3267 | static void |
2acc282a | 3268 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 3269 | int step, int signal, siginfo_t *info) |
da6d8c04 | 3270 | { |
d86d4aaf | 3271 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 3272 | struct thread_info *saved_thread; |
fa593d66 | 3273 | int fast_tp_collecting; |
0d62e5e8 | 3274 | |
54a0b537 | 3275 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3276 | return; |
3277 | ||
fa593d66 PA |
3278 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3279 | ||
3280 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3281 | ||
219f2f23 PA |
3282 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3283 | user used the "jump" command, or "set $pc = foo"). */ | |
3284 | if (lwp->stop_pc != get_pc (lwp)) | |
3285 | { | |
3286 | /* Collecting 'while-stepping' actions doesn't make sense | |
3287 | anymore. */ | |
d86d4aaf | 3288 | release_while_stepping_state_list (thread); |
219f2f23 PA |
3289 | } |
3290 | ||
0d62e5e8 DJ |
3291 | /* If we have pending signals or status, and a new signal, enqueue the |
3292 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3293 | breakpoint; it will be picked up again below. */ | |
3294 | if (signal != 0 | |
fa593d66 PA |
3295 | && (lwp->status_pending_p |
3296 | || lwp->pending_signals != NULL | |
3297 | || lwp->bp_reinsert != 0 | |
3298 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3299 | { |
3300 | struct pending_signals *p_sig; | |
bca929d3 | 3301 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3302 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3303 | p_sig->signal = signal; |
32ca6d61 DJ |
3304 | if (info == NULL) |
3305 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3306 | else | |
3307 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3308 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3309 | } |
3310 | ||
d50171e4 PA |
3311 | if (lwp->status_pending_p) |
3312 | { | |
3313 | if (debug_threads) | |
87ce2a04 DE |
3314 | debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);" |
3315 | " has pending status\n", | |
d86d4aaf | 3316 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3317 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
3318 | return; |
3319 | } | |
0d62e5e8 | 3320 | |
0bfdf32f GB |
3321 | saved_thread = current_thread; |
3322 | current_thread = thread; | |
0d62e5e8 DJ |
3323 | |
3324 | if (debug_threads) | |
87ce2a04 | 3325 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", |
d86d4aaf | 3326 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3327 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3328 | |
3329 | /* This bit needs some thinking about. If we get a signal that | |
3330 | we must report while a single-step reinsert is still pending, | |
3331 | we often end up resuming the thread. It might be better to | |
3332 | (ew) allow a stack of pending events; then we could be sure that | |
3333 | the reinsert happened right away and not lose any signals. | |
3334 | ||
3335 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3336 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3337 | complete correctness, so it won't solve that problem. It may be |
3338 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3339 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3340 | { |
3341 | if (debug_threads) | |
87ce2a04 DE |
3342 | debug_printf (" pending reinsert at 0x%s\n", |
3343 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 3344 | |
85e00e85 | 3345 | if (can_hardware_single_step ()) |
d50171e4 | 3346 | { |
fa593d66 PA |
3347 | if (fast_tp_collecting == 0) |
3348 | { | |
3349 | if (step == 0) | |
3350 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3351 | if (lwp->suspended) | |
3352 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3353 | lwp->suspended); | |
3354 | } | |
d50171e4 PA |
3355 | |
3356 | step = 1; | |
3357 | } | |
0d62e5e8 DJ |
3358 | |
3359 | /* Postpone any pending signal. It was enqueued above. */ | |
3360 | signal = 0; | |
3361 | } | |
3362 | ||
fa593d66 PA |
3363 | if (fast_tp_collecting == 1) |
3364 | { | |
3365 | if (debug_threads) | |
87ce2a04 DE |
3366 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3367 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 3368 | lwpid_of (thread)); |
fa593d66 PA |
3369 | |
3370 | /* Postpone any pending signal. It was enqueued above. */ | |
3371 | signal = 0; | |
3372 | } | |
3373 | else if (fast_tp_collecting == 2) | |
3374 | { | |
3375 | if (debug_threads) | |
87ce2a04 DE |
3376 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3377 | " single-stepping\n", | |
d86d4aaf | 3378 | lwpid_of (thread)); |
fa593d66 PA |
3379 | |
3380 | if (can_hardware_single_step ()) | |
3381 | step = 1; | |
3382 | else | |
38e08fca GB |
3383 | { |
3384 | internal_error (__FILE__, __LINE__, | |
3385 | "moving out of jump pad single-stepping" | |
3386 | " not implemented on this target"); | |
3387 | } | |
fa593d66 PA |
3388 | |
3389 | /* Postpone any pending signal. It was enqueued above. */ | |
3390 | signal = 0; | |
3391 | } | |
3392 | ||
219f2f23 PA |
3393 | /* If we have while-stepping actions in this thread set it stepping. |
3394 | If we have a signal to deliver, it may or may not be set to | |
3395 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3396 | while-stepping into a signal handler. A possible smart thing to | |
3397 | do would be to set an internal breakpoint at the signal return | |
3398 | address, continue, and carry on catching this while-stepping | |
3399 | action only when that breakpoint is hit. A future | |
3400 | enhancement. */ | |
d86d4aaf | 3401 | if (thread->while_stepping != NULL |
219f2f23 PA |
3402 | && can_hardware_single_step ()) |
3403 | { | |
3404 | if (debug_threads) | |
87ce2a04 | 3405 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 3406 | lwpid_of (thread)); |
219f2f23 PA |
3407 | step = 1; |
3408 | } | |
3409 | ||
aa691b87 | 3410 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 3411 | { |
0bfdf32f | 3412 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
442ea881 | 3413 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); |
87ce2a04 | 3414 | debug_printf (" resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
3415 | } |
3416 | ||
fa593d66 PA |
3417 | /* If we have pending signals, consume one unless we are trying to |
3418 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3419 | collect. */ | |
3420 | if (lwp->pending_signals != NULL | |
3421 | && lwp->bp_reinsert == 0 | |
3422 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3423 | { |
3424 | struct pending_signals **p_sig; | |
3425 | ||
54a0b537 | 3426 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3427 | while ((*p_sig)->prev != NULL) |
3428 | p_sig = &(*p_sig)->prev; | |
3429 | ||
3430 | signal = (*p_sig)->signal; | |
32ca6d61 | 3431 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 3432 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3433 | &(*p_sig)->info); |
32ca6d61 | 3434 | |
0d62e5e8 DJ |
3435 | free (*p_sig); |
3436 | *p_sig = NULL; | |
3437 | } | |
3438 | ||
aa5ca48f DE |
3439 | if (the_low_target.prepare_to_resume != NULL) |
3440 | the_low_target.prepare_to_resume (lwp); | |
3441 | ||
d86d4aaf | 3442 | regcache_invalidate_thread (thread); |
da6d8c04 | 3443 | errno = 0; |
54a0b537 | 3444 | lwp->stopped = 0; |
c3adc08c | 3445 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 3446 | lwp->stepping = step; |
d86d4aaf | 3447 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (thread), |
b8e1b30e | 3448 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
3449 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3450 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 3451 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 3452 | |
0bfdf32f | 3453 | current_thread = saved_thread; |
da6d8c04 | 3454 | if (errno) |
3221518c UW |
3455 | { |
3456 | /* ESRCH from ptrace either means that the thread was already | |
3457 | running (an error) or that it is gone (a race condition). If | |
3458 | it's gone, we will get a notification the next time we wait, | |
3459 | so we can ignore the error. We could differentiate these | |
3460 | two, but it's tricky without waiting; the thread still exists | |
3461 | as a zombie, so sending it signal 0 would succeed. So just | |
3462 | ignore ESRCH. */ | |
3463 | if (errno == ESRCH) | |
3464 | return; | |
3465 | ||
3466 | perror_with_name ("ptrace"); | |
3467 | } | |
da6d8c04 DJ |
3468 | } |
3469 | ||
2bd7c093 PA |
3470 | struct thread_resume_array |
3471 | { | |
3472 | struct thread_resume *resume; | |
3473 | size_t n; | |
3474 | }; | |
64386c31 | 3475 | |
ebcf782c DE |
3476 | /* This function is called once per thread via find_inferior. |
3477 | ARG is a pointer to a thread_resume_array struct. | |
3478 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
3479 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
3480 | |
3481 | This algorithm is O(threads * resume elements), but resume elements | |
3482 | is small (and will remain small at least until GDB supports thread | |
3483 | suspension). */ | |
ebcf782c | 3484 | |
2bd7c093 PA |
3485 | static int |
3486 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3487 | { |
d86d4aaf DE |
3488 | struct thread_info *thread = (struct thread_info *) entry; |
3489 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3490 | int ndx; |
2bd7c093 | 3491 | struct thread_resume_array *r; |
64386c31 | 3492 | |
2bd7c093 | 3493 | r = arg; |
64386c31 | 3494 | |
2bd7c093 | 3495 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3496 | { |
3497 | ptid_t ptid = r->resume[ndx].thread; | |
3498 | if (ptid_equal (ptid, minus_one_ptid) | |
3499 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
3500 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
3501 | of PID'. */ | |
d86d4aaf | 3502 | || (ptid_get_pid (ptid) == pid_of (thread) |
0c9070b3 YQ |
3503 | && (ptid_is_pid (ptid) |
3504 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 3505 | { |
d50171e4 | 3506 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3507 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3508 | { |
3509 | if (debug_threads) | |
87ce2a04 DE |
3510 | debug_printf ("already %s LWP %ld at GDB's request\n", |
3511 | (thread->last_status.kind | |
3512 | == TARGET_WAITKIND_STOPPED) | |
3513 | ? "stopped" | |
3514 | : "stopping", | |
d86d4aaf | 3515 | lwpid_of (thread)); |
d50171e4 PA |
3516 | |
3517 | continue; | |
3518 | } | |
3519 | ||
95954743 | 3520 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3521 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 3522 | |
c2d6af84 PA |
3523 | lwp->step_range_start = lwp->resume->step_range_start; |
3524 | lwp->step_range_end = lwp->resume->step_range_end; | |
3525 | ||
fa593d66 PA |
3526 | /* If we had a deferred signal to report, dequeue one now. |
3527 | This can happen if LWP gets more than one signal while | |
3528 | trying to get out of a jump pad. */ | |
3529 | if (lwp->stopped | |
3530 | && !lwp->status_pending_p | |
3531 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3532 | { | |
3533 | lwp->status_pending_p = 1; | |
3534 | ||
3535 | if (debug_threads) | |
87ce2a04 DE |
3536 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
3537 | "leaving status pending.\n", | |
d86d4aaf DE |
3538 | WSTOPSIG (lwp->status_pending), |
3539 | lwpid_of (thread)); | |
fa593d66 PA |
3540 | } |
3541 | ||
95954743 PA |
3542 | return 0; |
3543 | } | |
3544 | } | |
2bd7c093 PA |
3545 | |
3546 | /* No resume action for this thread. */ | |
3547 | lwp->resume = NULL; | |
64386c31 | 3548 | |
2bd7c093 | 3549 | return 0; |
5544ad89 DJ |
3550 | } |
3551 | ||
20ad9378 DE |
3552 | /* find_inferior callback for linux_resume. |
3553 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 3554 | |
bd99dc85 PA |
3555 | static int |
3556 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3557 | { |
d86d4aaf DE |
3558 | struct thread_info *thread = (struct thread_info *) entry; |
3559 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3560 | |
bd99dc85 PA |
3561 | /* LWPs which will not be resumed are not interesting, because |
3562 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3563 | if (lwp->resume == NULL) |
bd99dc85 | 3564 | return 0; |
64386c31 | 3565 | |
bd99dc85 | 3566 | if (lwp->status_pending_p) |
d50171e4 PA |
3567 | * (int *) flag_p = 1; |
3568 | ||
3569 | return 0; | |
3570 | } | |
3571 | ||
3572 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3573 | internal breakpoint that we need to step over. It assumes that any | |
3574 | required STOP_PC adjustment has already been propagated to the | |
3575 | inferior's regcache. */ | |
3576 | ||
3577 | static int | |
3578 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3579 | { | |
d86d4aaf DE |
3580 | struct thread_info *thread = (struct thread_info *) entry; |
3581 | struct lwp_info *lwp = get_thread_lwp (thread); | |
0bfdf32f | 3582 | struct thread_info *saved_thread; |
d50171e4 PA |
3583 | CORE_ADDR pc; |
3584 | ||
3585 | /* LWPs which will not be resumed are not interesting, because we | |
3586 | might not wait for them next time through linux_wait. */ | |
3587 | ||
3588 | if (!lwp->stopped) | |
3589 | { | |
3590 | if (debug_threads) | |
87ce2a04 | 3591 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 3592 | lwpid_of (thread)); |
d50171e4 PA |
3593 | return 0; |
3594 | } | |
3595 | ||
8336d594 | 3596 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3597 | { |
3598 | if (debug_threads) | |
87ce2a04 DE |
3599 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
3600 | " stopped\n", | |
d86d4aaf | 3601 | lwpid_of (thread)); |
d50171e4 PA |
3602 | return 0; |
3603 | } | |
3604 | ||
7984d532 PA |
3605 | gdb_assert (lwp->suspended >= 0); |
3606 | ||
3607 | if (lwp->suspended) | |
3608 | { | |
3609 | if (debug_threads) | |
87ce2a04 | 3610 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 3611 | lwpid_of (thread)); |
7984d532 PA |
3612 | return 0; |
3613 | } | |
3614 | ||
d50171e4 PA |
3615 | if (!lwp->need_step_over) |
3616 | { | |
3617 | if (debug_threads) | |
d86d4aaf | 3618 | debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread)); |
d50171e4 | 3619 | } |
5544ad89 | 3620 | |
bd99dc85 | 3621 | if (lwp->status_pending_p) |
d50171e4 PA |
3622 | { |
3623 | if (debug_threads) | |
87ce2a04 DE |
3624 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
3625 | " status.\n", | |
d86d4aaf | 3626 | lwpid_of (thread)); |
d50171e4 PA |
3627 | return 0; |
3628 | } | |
3629 | ||
3630 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3631 | or we have. */ | |
3632 | pc = get_pc (lwp); | |
3633 | ||
3634 | /* If the PC has changed since we stopped, then don't do anything, | |
3635 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3636 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3637 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3638 | command, or poked thread's registers herself. */ | |
3639 | if (pc != lwp->stop_pc) | |
3640 | { | |
3641 | if (debug_threads) | |
87ce2a04 DE |
3642 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
3643 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
3644 | lwpid_of (thread), |
3645 | paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
3646 | |
3647 | lwp->need_step_over = 0; | |
3648 | return 0; | |
3649 | } | |
3650 | ||
0bfdf32f GB |
3651 | saved_thread = current_thread; |
3652 | current_thread = thread; | |
d50171e4 | 3653 | |
8b07ae33 | 3654 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3655 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3656 | { |
8b07ae33 | 3657 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
3658 | though. If the condition is being evaluated on the target's side |
3659 | and it evaluate to false, step over this breakpoint as well. */ | |
3660 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
3661 | && gdb_condition_true_at_breakpoint (pc) |
3662 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
3663 | { |
3664 | if (debug_threads) | |
87ce2a04 DE |
3665 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
3666 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 3667 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 3668 | |
0bfdf32f | 3669 | current_thread = saved_thread; |
8b07ae33 PA |
3670 | return 0; |
3671 | } | |
3672 | else | |
3673 | { | |
3674 | if (debug_threads) | |
87ce2a04 DE |
3675 | debug_printf ("Need step over [LWP %ld]? yes, " |
3676 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 3677 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 3678 | |
8b07ae33 PA |
3679 | /* We've found an lwp that needs stepping over --- return 1 so |
3680 | that find_inferior stops looking. */ | |
0bfdf32f | 3681 | current_thread = saved_thread; |
8b07ae33 PA |
3682 | |
3683 | /* If the step over is cancelled, this is set again. */ | |
3684 | lwp->need_step_over = 0; | |
3685 | return 1; | |
3686 | } | |
d50171e4 PA |
3687 | } |
3688 | ||
0bfdf32f | 3689 | current_thread = saved_thread; |
d50171e4 PA |
3690 | |
3691 | if (debug_threads) | |
87ce2a04 DE |
3692 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
3693 | " at 0x%s\n", | |
d86d4aaf | 3694 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 3695 | |
bd99dc85 | 3696 | return 0; |
5544ad89 DJ |
3697 | } |
3698 | ||
d50171e4 PA |
3699 | /* Start a step-over operation on LWP. When LWP stopped at a |
3700 | breakpoint, to make progress, we need to remove the breakpoint out | |
3701 | of the way. If we let other threads run while we do that, they may | |
3702 | pass by the breakpoint location and miss hitting it. To avoid | |
3703 | that, a step-over momentarily stops all threads while LWP is | |
3704 | single-stepped while the breakpoint is temporarily uninserted from | |
3705 | the inferior. When the single-step finishes, we reinsert the | |
3706 | breakpoint, and let all threads that are supposed to be running, | |
3707 | run again. | |
3708 | ||
3709 | On targets that don't support hardware single-step, we don't | |
3710 | currently support full software single-stepping. Instead, we only | |
3711 | support stepping over the thread event breakpoint, by asking the | |
3712 | low target where to place a reinsert breakpoint. Since this | |
3713 | routine assumes the breakpoint being stepped over is a thread event | |
3714 | breakpoint, it usually assumes the return address of the current | |
3715 | function is a good enough place to set the reinsert breakpoint. */ | |
3716 | ||
3717 | static int | |
3718 | start_step_over (struct lwp_info *lwp) | |
3719 | { | |
d86d4aaf | 3720 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 3721 | struct thread_info *saved_thread; |
d50171e4 PA |
3722 | CORE_ADDR pc; |
3723 | int step; | |
3724 | ||
3725 | if (debug_threads) | |
87ce2a04 | 3726 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 3727 | lwpid_of (thread)); |
d50171e4 | 3728 | |
7984d532 PA |
3729 | stop_all_lwps (1, lwp); |
3730 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3731 | |
3732 | if (debug_threads) | |
87ce2a04 | 3733 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
3734 | |
3735 | /* Note, we should always reach here with an already adjusted PC, | |
3736 | either by GDB (if we're resuming due to GDB's request), or by our | |
3737 | caller, if we just finished handling an internal breakpoint GDB | |
3738 | shouldn't care about. */ | |
3739 | pc = get_pc (lwp); | |
3740 | ||
0bfdf32f GB |
3741 | saved_thread = current_thread; |
3742 | current_thread = thread; | |
d50171e4 PA |
3743 | |
3744 | lwp->bp_reinsert = pc; | |
3745 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3746 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3747 | |
3748 | if (can_hardware_single_step ()) | |
3749 | { | |
3750 | step = 1; | |
3751 | } | |
3752 | else | |
3753 | { | |
3754 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3755 | set_reinsert_breakpoint (raddr); | |
3756 | step = 0; | |
3757 | } | |
3758 | ||
0bfdf32f | 3759 | current_thread = saved_thread; |
d50171e4 PA |
3760 | |
3761 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3762 | ||
3763 | /* Require next event from this LWP. */ | |
d86d4aaf | 3764 | step_over_bkpt = thread->entry.id; |
d50171e4 PA |
3765 | return 1; |
3766 | } | |
3767 | ||
3768 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3769 | start_step_over, if still there, and delete any reinsert | |
3770 | breakpoints we've set, on non hardware single-step targets. */ | |
3771 | ||
3772 | static int | |
3773 | finish_step_over (struct lwp_info *lwp) | |
3774 | { | |
3775 | if (lwp->bp_reinsert != 0) | |
3776 | { | |
3777 | if (debug_threads) | |
87ce2a04 | 3778 | debug_printf ("Finished step over.\n"); |
d50171e4 PA |
3779 | |
3780 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3781 | may be no breakpoint to reinsert there by now. */ | |
3782 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3783 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3784 | |
3785 | lwp->bp_reinsert = 0; | |
3786 | ||
3787 | /* Delete any software-single-step reinsert breakpoints. No | |
3788 | longer needed. We don't have to worry about other threads | |
3789 | hitting this trap, and later not being able to explain it, | |
3790 | because we were stepping over a breakpoint, and we hold all | |
3791 | threads but LWP stopped while doing that. */ | |
3792 | if (!can_hardware_single_step ()) | |
3793 | delete_reinsert_breakpoints (); | |
3794 | ||
3795 | step_over_bkpt = null_ptid; | |
3796 | return 1; | |
3797 | } | |
3798 | else | |
3799 | return 0; | |
3800 | } | |
3801 | ||
5544ad89 DJ |
3802 | /* This function is called once per thread. We check the thread's resume |
3803 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3804 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3805 | |
bd99dc85 PA |
3806 | For threads which we aren't explicitly told otherwise, we preserve |
3807 | the stepping flag; this is used for stepping over gdbserver-placed | |
3808 | breakpoints. | |
3809 | ||
3810 | If pending_flags was set in any thread, we queue any needed | |
3811 | signals, since we won't actually resume. We already have a pending | |
3812 | event to report, so we don't need to preserve any step requests; | |
3813 | they should be re-issued if necessary. */ | |
3814 | ||
3815 | static int | |
3816 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3817 | { |
d86d4aaf DE |
3818 | struct thread_info *thread = (struct thread_info *) entry; |
3819 | struct lwp_info *lwp = get_thread_lwp (thread); | |
bd99dc85 | 3820 | int step; |
d50171e4 PA |
3821 | int leave_all_stopped = * (int *) arg; |
3822 | int leave_pending; | |
5544ad89 | 3823 | |
2bd7c093 | 3824 | if (lwp->resume == NULL) |
bd99dc85 | 3825 | return 0; |
5544ad89 | 3826 | |
bd99dc85 | 3827 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3828 | { |
bd99dc85 | 3829 | if (debug_threads) |
d86d4aaf | 3830 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
3831 | |
3832 | if (!lwp->stopped) | |
3833 | { | |
3834 | if (debug_threads) | |
d86d4aaf | 3835 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 3836 | |
d50171e4 PA |
3837 | /* Stop the thread, and wait for the event asynchronously, |
3838 | through the event loop. */ | |
02fc4de7 | 3839 | send_sigstop (lwp); |
bd99dc85 PA |
3840 | } |
3841 | else | |
3842 | { | |
3843 | if (debug_threads) | |
87ce2a04 | 3844 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 3845 | lwpid_of (thread)); |
d50171e4 PA |
3846 | |
3847 | /* The LWP may have been stopped in an internal event that | |
3848 | was not meant to be notified back to GDB (e.g., gdbserver | |
3849 | breakpoint), so we should be reporting a stop event in | |
3850 | this case too. */ | |
3851 | ||
3852 | /* If the thread already has a pending SIGSTOP, this is a | |
3853 | no-op. Otherwise, something later will presumably resume | |
3854 | the thread and this will cause it to cancel any pending | |
3855 | operation, due to last_resume_kind == resume_stop. If | |
3856 | the thread already has a pending status to report, we | |
3857 | will still report it the next time we wait - see | |
3858 | status_pending_p_callback. */ | |
1a981360 PA |
3859 | |
3860 | /* If we already have a pending signal to report, then | |
3861 | there's no need to queue a SIGSTOP, as this means we're | |
3862 | midway through moving the LWP out of the jumppad, and we | |
3863 | will report the pending signal as soon as that is | |
3864 | finished. */ | |
3865 | if (lwp->pending_signals_to_report == NULL) | |
3866 | send_sigstop (lwp); | |
bd99dc85 | 3867 | } |
32ca6d61 | 3868 | |
bd99dc85 PA |
3869 | /* For stop requests, we're done. */ |
3870 | lwp->resume = NULL; | |
fc7238bb | 3871 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3872 | return 0; |
5544ad89 DJ |
3873 | } |
3874 | ||
bd99dc85 PA |
3875 | /* If this thread which is about to be resumed has a pending status, |
3876 | then don't resume any threads - we can just report the pending | |
3877 | status. Make sure to queue any signals that would otherwise be | |
3878 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3879 | thread has a pending status. If there's a thread that needs the |
3880 | step-over-breakpoint dance, then don't resume any other thread | |
3881 | but that particular one. */ | |
3882 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3883 | |
d50171e4 | 3884 | if (!leave_pending) |
bd99dc85 PA |
3885 | { |
3886 | if (debug_threads) | |
d86d4aaf | 3887 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 3888 | |
d50171e4 | 3889 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3890 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3891 | } |
3892 | else | |
3893 | { | |
3894 | if (debug_threads) | |
d86d4aaf | 3895 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
5544ad89 | 3896 | |
bd99dc85 PA |
3897 | /* If we have a new signal, enqueue the signal. */ |
3898 | if (lwp->resume->sig != 0) | |
3899 | { | |
3900 | struct pending_signals *p_sig; | |
3901 | p_sig = xmalloc (sizeof (*p_sig)); | |
3902 | p_sig->prev = lwp->pending_signals; | |
3903 | p_sig->signal = lwp->resume->sig; | |
3904 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3905 | ||
3906 | /* If this is the same signal we were previously stopped by, | |
3907 | make sure to queue its siginfo. We can ignore the return | |
3908 | value of ptrace; if it fails, we'll skip | |
3909 | PTRACE_SETSIGINFO. */ | |
3910 | if (WIFSTOPPED (lwp->last_status) | |
3911 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
d86d4aaf | 3912 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3913 | &p_sig->info); |
bd99dc85 PA |
3914 | |
3915 | lwp->pending_signals = p_sig; | |
3916 | } | |
3917 | } | |
5544ad89 | 3918 | |
fc7238bb | 3919 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3920 | lwp->resume = NULL; |
5544ad89 | 3921 | return 0; |
0d62e5e8 DJ |
3922 | } |
3923 | ||
3924 | static void | |
2bd7c093 | 3925 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3926 | { |
2bd7c093 | 3927 | struct thread_resume_array array = { resume_info, n }; |
d86d4aaf | 3928 | struct thread_info *need_step_over = NULL; |
d50171e4 PA |
3929 | int any_pending; |
3930 | int leave_all_stopped; | |
c6ecbae5 | 3931 | |
87ce2a04 DE |
3932 | if (debug_threads) |
3933 | { | |
3934 | debug_enter (); | |
3935 | debug_printf ("linux_resume:\n"); | |
3936 | } | |
3937 | ||
2bd7c093 | 3938 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3939 | |
d50171e4 PA |
3940 | /* If there is a thread which would otherwise be resumed, which has |
3941 | a pending status, then don't resume any threads - we can just | |
3942 | report the pending status. Make sure to queue any signals that | |
3943 | would otherwise be sent. In non-stop mode, we'll apply this | |
3944 | logic to each thread individually. We consume all pending events | |
3945 | before considering to start a step-over (in all-stop). */ | |
3946 | any_pending = 0; | |
bd99dc85 | 3947 | if (!non_stop) |
d86d4aaf | 3948 | find_inferior (&all_threads, resume_status_pending_p, &any_pending); |
d50171e4 PA |
3949 | |
3950 | /* If there is a thread which would otherwise be resumed, which is | |
3951 | stopped at a breakpoint that needs stepping over, then don't | |
3952 | resume any threads - have it step over the breakpoint with all | |
3953 | other threads stopped, then resume all threads again. Make sure | |
3954 | to queue any signals that would otherwise be delivered or | |
3955 | queued. */ | |
3956 | if (!any_pending && supports_breakpoints ()) | |
3957 | need_step_over | |
d86d4aaf DE |
3958 | = (struct thread_info *) find_inferior (&all_threads, |
3959 | need_step_over_p, NULL); | |
d50171e4 PA |
3960 | |
3961 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
3962 | ||
3963 | if (debug_threads) | |
3964 | { | |
3965 | if (need_step_over != NULL) | |
87ce2a04 | 3966 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 3967 | else if (any_pending) |
87ce2a04 DE |
3968 | debug_printf ("Not resuming, all-stop and found " |
3969 | "an LWP with pending status\n"); | |
d50171e4 | 3970 | else |
87ce2a04 | 3971 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
3972 | } |
3973 | ||
3974 | /* Even if we're leaving threads stopped, queue all signals we'd | |
3975 | otherwise deliver. */ | |
3976 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
3977 | ||
3978 | if (need_step_over) | |
d86d4aaf | 3979 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
3980 | |
3981 | if (debug_threads) | |
3982 | { | |
3983 | debug_printf ("linux_resume done\n"); | |
3984 | debug_exit (); | |
3985 | } | |
d50171e4 PA |
3986 | } |
3987 | ||
3988 | /* This function is called once per thread. We check the thread's | |
3989 | last resume request, which will tell us whether to resume, step, or | |
3990 | leave the thread stopped. Any signal the client requested to be | |
3991 | delivered has already been enqueued at this point. | |
3992 | ||
3993 | If any thread that GDB wants running is stopped at an internal | |
3994 | breakpoint that needs stepping over, we start a step-over operation | |
3995 | on that particular thread, and leave all others stopped. */ | |
3996 | ||
7984d532 PA |
3997 | static int |
3998 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 3999 | { |
d86d4aaf DE |
4000 | struct thread_info *thread = (struct thread_info *) entry; |
4001 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
4002 | int step; |
4003 | ||
7984d532 PA |
4004 | if (lwp == except) |
4005 | return 0; | |
d50171e4 PA |
4006 | |
4007 | if (debug_threads) | |
d86d4aaf | 4008 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4009 | |
4010 | if (!lwp->stopped) | |
4011 | { | |
4012 | if (debug_threads) | |
d86d4aaf | 4013 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
7984d532 | 4014 | return 0; |
d50171e4 PA |
4015 | } |
4016 | ||
02fc4de7 PA |
4017 | if (thread->last_resume_kind == resume_stop |
4018 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4019 | { |
4020 | if (debug_threads) | |
87ce2a04 | 4021 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4022 | lwpid_of (thread)); |
7984d532 | 4023 | return 0; |
d50171e4 PA |
4024 | } |
4025 | ||
4026 | if (lwp->status_pending_p) | |
4027 | { | |
4028 | if (debug_threads) | |
87ce2a04 | 4029 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4030 | lwpid_of (thread)); |
7984d532 | 4031 | return 0; |
d50171e4 PA |
4032 | } |
4033 | ||
7984d532 PA |
4034 | gdb_assert (lwp->suspended >= 0); |
4035 | ||
d50171e4 PA |
4036 | if (lwp->suspended) |
4037 | { | |
4038 | if (debug_threads) | |
d86d4aaf | 4039 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
7984d532 | 4040 | return 0; |
d50171e4 PA |
4041 | } |
4042 | ||
1a981360 PA |
4043 | if (thread->last_resume_kind == resume_stop |
4044 | && lwp->pending_signals_to_report == NULL | |
4045 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
4046 | { |
4047 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4048 | last_status.kind check above would catch it, and we wouldn't | |
4049 | reach here. This LWP may have been momentarily paused by a | |
4050 | stop_all_lwps call while handling for example, another LWP's | |
4051 | step-over. In that case, the pending expected SIGSTOP signal | |
4052 | that was queued at vCont;t handling time will have already | |
4053 | been consumed by wait_for_sigstop, and so we need to requeue | |
4054 | another one here. Note that if the LWP already has a SIGSTOP | |
4055 | pending, this is a no-op. */ | |
4056 | ||
4057 | if (debug_threads) | |
87ce2a04 DE |
4058 | debug_printf ("Client wants LWP %ld to stop. " |
4059 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 4060 | lwpid_of (thread)); |
02fc4de7 PA |
4061 | |
4062 | send_sigstop (lwp); | |
4063 | } | |
4064 | ||
8336d594 | 4065 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 4066 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
4067 | return 0; |
4068 | } | |
4069 | ||
4070 | static int | |
4071 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
4072 | { | |
d86d4aaf DE |
4073 | struct thread_info *thread = (struct thread_info *) entry; |
4074 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
4075 | |
4076 | if (lwp == except) | |
4077 | return 0; | |
4078 | ||
4079 | lwp->suspended--; | |
4080 | gdb_assert (lwp->suspended >= 0); | |
4081 | ||
4082 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
4083 | } |
4084 | ||
4085 | /* When we finish a step-over, set threads running again. If there's | |
4086 | another thread that may need a step-over, now's the time to start | |
4087 | it. Eventually, we'll move all threads past their breakpoints. */ | |
4088 | ||
4089 | static void | |
4090 | proceed_all_lwps (void) | |
4091 | { | |
d86d4aaf | 4092 | struct thread_info *need_step_over; |
d50171e4 PA |
4093 | |
4094 | /* If there is a thread which would otherwise be resumed, which is | |
4095 | stopped at a breakpoint that needs stepping over, then don't | |
4096 | resume any threads - have it step over the breakpoint with all | |
4097 | other threads stopped, then resume all threads again. */ | |
4098 | ||
4099 | if (supports_breakpoints ()) | |
4100 | { | |
4101 | need_step_over | |
d86d4aaf DE |
4102 | = (struct thread_info *) find_inferior (&all_threads, |
4103 | need_step_over_p, NULL); | |
d50171e4 PA |
4104 | |
4105 | if (need_step_over != NULL) | |
4106 | { | |
4107 | if (debug_threads) | |
87ce2a04 DE |
4108 | debug_printf ("proceed_all_lwps: found " |
4109 | "thread %ld needing a step-over\n", | |
4110 | lwpid_of (need_step_over)); | |
d50171e4 | 4111 | |
d86d4aaf | 4112 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
4113 | return; |
4114 | } | |
4115 | } | |
5544ad89 | 4116 | |
d50171e4 | 4117 | if (debug_threads) |
87ce2a04 | 4118 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 4119 | |
d86d4aaf | 4120 | find_inferior (&all_threads, proceed_one_lwp, NULL); |
d50171e4 PA |
4121 | } |
4122 | ||
4123 | /* Stopped LWPs that the client wanted to be running, that don't have | |
4124 | pending statuses, are set to run again, except for EXCEPT, if not | |
4125 | NULL. This undoes a stop_all_lwps call. */ | |
4126 | ||
4127 | static void | |
7984d532 | 4128 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 4129 | { |
5544ad89 DJ |
4130 | if (debug_threads) |
4131 | { | |
87ce2a04 | 4132 | debug_enter (); |
d50171e4 | 4133 | if (except) |
87ce2a04 | 4134 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 4135 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 4136 | else |
87ce2a04 | 4137 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
4138 | } |
4139 | ||
7984d532 | 4140 | if (unsuspend) |
d86d4aaf | 4141 | find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except); |
7984d532 | 4142 | else |
d86d4aaf | 4143 | find_inferior (&all_threads, proceed_one_lwp, except); |
87ce2a04 DE |
4144 | |
4145 | if (debug_threads) | |
4146 | { | |
4147 | debug_printf ("unstop_all_lwps done\n"); | |
4148 | debug_exit (); | |
4149 | } | |
0d62e5e8 DJ |
4150 | } |
4151 | ||
58caa3dc DJ |
4152 | |
4153 | #ifdef HAVE_LINUX_REGSETS | |
4154 | ||
1faeff08 MR |
4155 | #define use_linux_regsets 1 |
4156 | ||
030031ee PA |
4157 | /* Returns true if REGSET has been disabled. */ |
4158 | ||
4159 | static int | |
4160 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
4161 | { | |
4162 | return (info->disabled_regsets != NULL | |
4163 | && info->disabled_regsets[regset - info->regsets]); | |
4164 | } | |
4165 | ||
4166 | /* Disable REGSET. */ | |
4167 | ||
4168 | static void | |
4169 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
4170 | { | |
4171 | int dr_offset; | |
4172 | ||
4173 | dr_offset = regset - info->regsets; | |
4174 | if (info->disabled_regsets == NULL) | |
4175 | info->disabled_regsets = xcalloc (1, info->num_regsets); | |
4176 | info->disabled_regsets[dr_offset] = 1; | |
4177 | } | |
4178 | ||
58caa3dc | 4179 | static int |
3aee8918 PA |
4180 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
4181 | struct regcache *regcache) | |
58caa3dc DJ |
4182 | { |
4183 | struct regset_info *regset; | |
e9d25b98 | 4184 | int saw_general_regs = 0; |
95954743 | 4185 | int pid; |
1570b33e | 4186 | struct iovec iov; |
58caa3dc | 4187 | |
0bfdf32f | 4188 | pid = lwpid_of (current_thread); |
28eef672 | 4189 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4190 | { |
1570b33e L |
4191 | void *buf, *data; |
4192 | int nt_type, res; | |
58caa3dc | 4193 | |
030031ee | 4194 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 4195 | continue; |
58caa3dc | 4196 | |
bca929d3 | 4197 | buf = xmalloc (regset->size); |
1570b33e L |
4198 | |
4199 | nt_type = regset->nt_type; | |
4200 | if (nt_type) | |
4201 | { | |
4202 | iov.iov_base = buf; | |
4203 | iov.iov_len = regset->size; | |
4204 | data = (void *) &iov; | |
4205 | } | |
4206 | else | |
4207 | data = buf; | |
4208 | ||
dfb64f85 | 4209 | #ifndef __sparc__ |
f15f9948 | 4210 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4211 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4212 | #else |
1570b33e | 4213 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4214 | #endif |
58caa3dc DJ |
4215 | if (res < 0) |
4216 | { | |
4217 | if (errno == EIO) | |
4218 | { | |
52fa2412 | 4219 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4220 | this process mode. */ |
030031ee | 4221 | disable_regset (regsets_info, regset); |
58caa3dc | 4222 | } |
e5a9158d AA |
4223 | else if (errno == ENODATA) |
4224 | { | |
4225 | /* ENODATA may be returned if the regset is currently | |
4226 | not "active". This can happen in normal operation, | |
4227 | so suppress the warning in this case. */ | |
4228 | } | |
58caa3dc DJ |
4229 | else |
4230 | { | |
0d62e5e8 | 4231 | char s[256]; |
95954743 PA |
4232 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4233 | pid); | |
0d62e5e8 | 4234 | perror (s); |
58caa3dc DJ |
4235 | } |
4236 | } | |
098dbe61 AA |
4237 | else |
4238 | { | |
4239 | if (regset->type == GENERAL_REGS) | |
4240 | saw_general_regs = 1; | |
4241 | regset->store_function (regcache, buf); | |
4242 | } | |
fdeb2a12 | 4243 | free (buf); |
58caa3dc | 4244 | } |
e9d25b98 DJ |
4245 | if (saw_general_regs) |
4246 | return 0; | |
4247 | else | |
4248 | return 1; | |
58caa3dc DJ |
4249 | } |
4250 | ||
4251 | static int | |
3aee8918 PA |
4252 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
4253 | struct regcache *regcache) | |
58caa3dc DJ |
4254 | { |
4255 | struct regset_info *regset; | |
e9d25b98 | 4256 | int saw_general_regs = 0; |
95954743 | 4257 | int pid; |
1570b33e | 4258 | struct iovec iov; |
58caa3dc | 4259 | |
0bfdf32f | 4260 | pid = lwpid_of (current_thread); |
28eef672 | 4261 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4262 | { |
1570b33e L |
4263 | void *buf, *data; |
4264 | int nt_type, res; | |
58caa3dc | 4265 | |
feea5f36 AA |
4266 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
4267 | || regset->fill_function == NULL) | |
28eef672 | 4268 | continue; |
58caa3dc | 4269 | |
bca929d3 | 4270 | buf = xmalloc (regset->size); |
545587ee DJ |
4271 | |
4272 | /* First fill the buffer with the current register set contents, | |
4273 | in case there are any items in the kernel's regset that are | |
4274 | not in gdbserver's regcache. */ | |
1570b33e L |
4275 | |
4276 | nt_type = regset->nt_type; | |
4277 | if (nt_type) | |
4278 | { | |
4279 | iov.iov_base = buf; | |
4280 | iov.iov_len = regset->size; | |
4281 | data = (void *) &iov; | |
4282 | } | |
4283 | else | |
4284 | data = buf; | |
4285 | ||
dfb64f85 | 4286 | #ifndef __sparc__ |
f15f9948 | 4287 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4288 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4289 | #else |
689cc2ae | 4290 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4291 | #endif |
545587ee DJ |
4292 | |
4293 | if (res == 0) | |
4294 | { | |
4295 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4296 | regset->fill_function (regcache, buf); |
545587ee DJ |
4297 | |
4298 | /* Only now do we write the register set. */ | |
dfb64f85 | 4299 | #ifndef __sparc__ |
f15f9948 | 4300 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 4301 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4302 | #else |
1570b33e | 4303 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4304 | #endif |
545587ee DJ |
4305 | } |
4306 | ||
58caa3dc DJ |
4307 | if (res < 0) |
4308 | { | |
4309 | if (errno == EIO) | |
4310 | { | |
52fa2412 | 4311 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4312 | this process mode. */ |
030031ee | 4313 | disable_regset (regsets_info, regset); |
58caa3dc | 4314 | } |
3221518c UW |
4315 | else if (errno == ESRCH) |
4316 | { | |
1b3f6016 PA |
4317 | /* At this point, ESRCH should mean the process is |
4318 | already gone, in which case we simply ignore attempts | |
4319 | to change its registers. See also the related | |
4320 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4321 | free (buf); |
3221518c UW |
4322 | return 0; |
4323 | } | |
58caa3dc DJ |
4324 | else |
4325 | { | |
ce3a066d | 4326 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4327 | } |
4328 | } | |
e9d25b98 DJ |
4329 | else if (regset->type == GENERAL_REGS) |
4330 | saw_general_regs = 1; | |
09ec9b38 | 4331 | free (buf); |
58caa3dc | 4332 | } |
e9d25b98 DJ |
4333 | if (saw_general_regs) |
4334 | return 0; | |
4335 | else | |
4336 | return 1; | |
58caa3dc DJ |
4337 | } |
4338 | ||
1faeff08 | 4339 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4340 | |
1faeff08 | 4341 | #define use_linux_regsets 0 |
3aee8918 PA |
4342 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
4343 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 4344 | |
58caa3dc | 4345 | #endif |
1faeff08 MR |
4346 | |
4347 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4348 | calls or 0 if it has to be transferred individually. */ | |
4349 | ||
4350 | static int | |
3aee8918 | 4351 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
4352 | { |
4353 | unsigned char mask = 1 << (regno % 8); | |
4354 | size_t index = regno / 8; | |
4355 | ||
4356 | return (use_linux_regsets | |
3aee8918 PA |
4357 | && (regs_info->regset_bitmap == NULL |
4358 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
4359 | } |
4360 | ||
58caa3dc | 4361 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4362 | |
4363 | int | |
3aee8918 | 4364 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
4365 | { |
4366 | int addr; | |
4367 | ||
3aee8918 | 4368 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
4369 | error ("Invalid register number %d.", regnum); |
4370 | ||
3aee8918 | 4371 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
4372 | |
4373 | return addr; | |
4374 | } | |
4375 | ||
4376 | /* Fetch one register. */ | |
4377 | static void | |
3aee8918 PA |
4378 | fetch_register (const struct usrregs_info *usrregs, |
4379 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4380 | { |
4381 | CORE_ADDR regaddr; | |
4382 | int i, size; | |
4383 | char *buf; | |
4384 | int pid; | |
4385 | ||
3aee8918 | 4386 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4387 | return; |
4388 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4389 | return; | |
4390 | ||
3aee8918 | 4391 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4392 | if (regaddr == -1) |
4393 | return; | |
4394 | ||
3aee8918 PA |
4395 | size = ((register_size (regcache->tdesc, regno) |
4396 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4397 | & -sizeof (PTRACE_XFER_TYPE)); |
4398 | buf = alloca (size); | |
4399 | ||
0bfdf32f | 4400 | pid = lwpid_of (current_thread); |
1faeff08 MR |
4401 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4402 | { | |
4403 | errno = 0; | |
4404 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4405 | ptrace (PTRACE_PEEKUSER, pid, | |
4406 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4407 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4408 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
4409 | regaddr += sizeof (PTRACE_XFER_TYPE); |
4410 | if (errno != 0) | |
4411 | error ("reading register %d: %s", regno, strerror (errno)); | |
4412 | } | |
4413 | ||
4414 | if (the_low_target.supply_ptrace_register) | |
4415 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4416 | else | |
4417 | supply_register (regcache, regno, buf); | |
4418 | } | |
4419 | ||
4420 | /* Store one register. */ | |
4421 | static void | |
3aee8918 PA |
4422 | store_register (const struct usrregs_info *usrregs, |
4423 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4424 | { |
4425 | CORE_ADDR regaddr; | |
4426 | int i, size; | |
4427 | char *buf; | |
4428 | int pid; | |
4429 | ||
3aee8918 | 4430 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4431 | return; |
4432 | if ((*the_low_target.cannot_store_register) (regno)) | |
4433 | return; | |
4434 | ||
3aee8918 | 4435 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4436 | if (regaddr == -1) |
4437 | return; | |
4438 | ||
3aee8918 PA |
4439 | size = ((register_size (regcache->tdesc, regno) |
4440 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4441 | & -sizeof (PTRACE_XFER_TYPE)); |
4442 | buf = alloca (size); | |
4443 | memset (buf, 0, size); | |
4444 | ||
4445 | if (the_low_target.collect_ptrace_register) | |
4446 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4447 | else | |
4448 | collect_register (regcache, regno, buf); | |
4449 | ||
0bfdf32f | 4450 | pid = lwpid_of (current_thread); |
1faeff08 MR |
4451 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4452 | { | |
4453 | errno = 0; | |
4454 | ptrace (PTRACE_POKEUSER, pid, | |
4455 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4456 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4457 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
4458 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
4459 | if (errno != 0) |
4460 | { | |
4461 | /* At this point, ESRCH should mean the process is | |
4462 | already gone, in which case we simply ignore attempts | |
4463 | to change its registers. See also the related | |
4464 | comment in linux_resume_one_lwp. */ | |
4465 | if (errno == ESRCH) | |
4466 | return; | |
4467 | ||
4468 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4469 | error ("writing register %d: %s", regno, strerror (errno)); | |
4470 | } | |
4471 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4472 | } | |
4473 | } | |
4474 | ||
4475 | /* Fetch all registers, or just one, from the child process. | |
4476 | If REGNO is -1, do this for all registers, skipping any that are | |
4477 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4478 | unless ALL is non-zero. | |
4479 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4480 | static void | |
3aee8918 PA |
4481 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
4482 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4483 | { |
3aee8918 PA |
4484 | struct usrregs_info *usr = regs_info->usrregs; |
4485 | ||
1faeff08 MR |
4486 | if (regno == -1) |
4487 | { | |
3aee8918 PA |
4488 | for (regno = 0; regno < usr->num_regs; regno++) |
4489 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4490 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
4491 | } |
4492 | else | |
3aee8918 | 4493 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
4494 | } |
4495 | ||
4496 | /* Store our register values back into the inferior. | |
4497 | If REGNO is -1, do this for all registers, skipping any that are | |
4498 | assumed to have been saved by regsets_store_inferior_registers, | |
4499 | unless ALL is non-zero. | |
4500 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4501 | static void | |
3aee8918 PA |
4502 | usr_store_inferior_registers (const struct regs_info *regs_info, |
4503 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4504 | { |
3aee8918 PA |
4505 | struct usrregs_info *usr = regs_info->usrregs; |
4506 | ||
1faeff08 MR |
4507 | if (regno == -1) |
4508 | { | |
3aee8918 PA |
4509 | for (regno = 0; regno < usr->num_regs; regno++) |
4510 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4511 | store_register (usr, regcache, regno); | |
1faeff08 MR |
4512 | } |
4513 | else | |
3aee8918 | 4514 | store_register (usr, regcache, regno); |
1faeff08 MR |
4515 | } |
4516 | ||
4517 | #else /* !HAVE_LINUX_USRREGS */ | |
4518 | ||
3aee8918 PA |
4519 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
4520 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 4521 | |
58caa3dc | 4522 | #endif |
1faeff08 MR |
4523 | |
4524 | ||
4525 | void | |
4526 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4527 | { | |
4528 | int use_regsets; | |
4529 | int all = 0; | |
3aee8918 | 4530 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4531 | |
4532 | if (regno == -1) | |
4533 | { | |
3aee8918 PA |
4534 | if (the_low_target.fetch_register != NULL |
4535 | && regs_info->usrregs != NULL) | |
4536 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
4537 | (*the_low_target.fetch_register) (regcache, regno); |
4538 | ||
3aee8918 PA |
4539 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
4540 | if (regs_info->usrregs != NULL) | |
4541 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
4542 | } |
4543 | else | |
4544 | { | |
c14dfd32 PA |
4545 | if (the_low_target.fetch_register != NULL |
4546 | && (*the_low_target.fetch_register) (regcache, regno)) | |
4547 | return; | |
4548 | ||
3aee8918 | 4549 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4550 | if (use_regsets) |
3aee8918 PA |
4551 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
4552 | regcache); | |
4553 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4554 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4555 | } |
58caa3dc DJ |
4556 | } |
4557 | ||
4558 | void | |
442ea881 | 4559 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 4560 | { |
1faeff08 MR |
4561 | int use_regsets; |
4562 | int all = 0; | |
3aee8918 | 4563 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4564 | |
4565 | if (regno == -1) | |
4566 | { | |
3aee8918 PA |
4567 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4568 | regcache); | |
4569 | if (regs_info->usrregs != NULL) | |
4570 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
4571 | } |
4572 | else | |
4573 | { | |
3aee8918 | 4574 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4575 | if (use_regsets) |
3aee8918 PA |
4576 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4577 | regcache); | |
4578 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4579 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4580 | } |
58caa3dc DJ |
4581 | } |
4582 | ||
da6d8c04 | 4583 | |
da6d8c04 DJ |
4584 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4585 | to debugger memory starting at MYADDR. */ | |
4586 | ||
c3e735a6 | 4587 | static int |
f450004a | 4588 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 4589 | { |
0bfdf32f | 4590 | int pid = lwpid_of (current_thread); |
4934b29e MR |
4591 | register PTRACE_XFER_TYPE *buffer; |
4592 | register CORE_ADDR addr; | |
4593 | register int count; | |
4594 | char filename[64]; | |
da6d8c04 | 4595 | register int i; |
4934b29e | 4596 | int ret; |
fd462a61 | 4597 | int fd; |
fd462a61 DJ |
4598 | |
4599 | /* Try using /proc. Don't bother for one word. */ | |
4600 | if (len >= 3 * sizeof (long)) | |
4601 | { | |
4934b29e MR |
4602 | int bytes; |
4603 | ||
fd462a61 DJ |
4604 | /* We could keep this file open and cache it - possibly one per |
4605 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4606 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4607 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4608 | if (fd == -1) | |
4609 | goto no_proc; | |
4610 | ||
4611 | /* If pread64 is available, use it. It's faster if the kernel | |
4612 | supports it (only one syscall), and it's 64-bit safe even on | |
4613 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4614 | application). */ | |
4615 | #ifdef HAVE_PREAD64 | |
4934b29e | 4616 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 4617 | #else |
4934b29e MR |
4618 | bytes = -1; |
4619 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
4620 | bytes = read (fd, myaddr, len); | |
fd462a61 | 4621 | #endif |
fd462a61 DJ |
4622 | |
4623 | close (fd); | |
4934b29e MR |
4624 | if (bytes == len) |
4625 | return 0; | |
4626 | ||
4627 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
4628 | if (bytes > 0) | |
4629 | { | |
4630 | memaddr += bytes; | |
4631 | myaddr += bytes; | |
4632 | len -= bytes; | |
4633 | } | |
fd462a61 | 4634 | } |
da6d8c04 | 4635 | |
fd462a61 | 4636 | no_proc: |
4934b29e MR |
4637 | /* Round starting address down to longword boundary. */ |
4638 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4639 | /* Round ending address up; get number of longwords that makes. */ | |
4640 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4641 | / sizeof (PTRACE_XFER_TYPE)); | |
4642 | /* Allocate buffer of that many longwords. */ | |
4643 | buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4644 | ||
da6d8c04 | 4645 | /* Read all the longwords */ |
4934b29e | 4646 | errno = 0; |
da6d8c04 DJ |
4647 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
4648 | { | |
14ce3065 DE |
4649 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4650 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4651 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
4652 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4653 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 4654 | if (errno) |
4934b29e | 4655 | break; |
da6d8c04 | 4656 | } |
4934b29e | 4657 | ret = errno; |
da6d8c04 DJ |
4658 | |
4659 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
4660 | if (i > 0) |
4661 | { | |
4662 | i *= sizeof (PTRACE_XFER_TYPE); | |
4663 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
4664 | memcpy (myaddr, | |
4665 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4666 | i < len ? i : len); | |
4667 | } | |
c3e735a6 | 4668 | |
4934b29e | 4669 | return ret; |
da6d8c04 DJ |
4670 | } |
4671 | ||
93ae6fdc PA |
4672 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4673 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 4674 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 4675 | |
ce3a066d | 4676 | static int |
f450004a | 4677 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4678 | { |
4679 | register int i; | |
4680 | /* Round starting address down to longword boundary. */ | |
4681 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4682 | /* Round ending address up; get number of longwords that makes. */ | |
4683 | register int count | |
493e2a69 MS |
4684 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4685 | / sizeof (PTRACE_XFER_TYPE); | |
4686 | ||
da6d8c04 | 4687 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4688 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4689 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4690 | ||
0bfdf32f | 4691 | int pid = lwpid_of (current_thread); |
da6d8c04 | 4692 | |
f0ae6fc3 PA |
4693 | if (len == 0) |
4694 | { | |
4695 | /* Zero length write always succeeds. */ | |
4696 | return 0; | |
4697 | } | |
4698 | ||
0d62e5e8 DJ |
4699 | if (debug_threads) |
4700 | { | |
58d6951d DJ |
4701 | /* Dump up to four bytes. */ |
4702 | unsigned int val = * (unsigned int *) myaddr; | |
4703 | if (len == 1) | |
4704 | val = val & 0xff; | |
4705 | else if (len == 2) | |
4706 | val = val & 0xffff; | |
4707 | else if (len == 3) | |
4708 | val = val & 0xffffff; | |
87ce2a04 DE |
4709 | debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), |
4710 | val, (long)memaddr); | |
0d62e5e8 DJ |
4711 | } |
4712 | ||
da6d8c04 DJ |
4713 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4714 | ||
93ae6fdc | 4715 | errno = 0; |
14ce3065 DE |
4716 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4717 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4718 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
4719 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4720 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
4721 | if (errno) |
4722 | return errno; | |
da6d8c04 DJ |
4723 | |
4724 | if (count > 1) | |
4725 | { | |
93ae6fdc | 4726 | errno = 0; |
da6d8c04 | 4727 | buffer[count - 1] |
95954743 | 4728 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4729 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4730 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4731 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 4732 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 4733 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
4734 | if (errno) |
4735 | return errno; | |
da6d8c04 DJ |
4736 | } |
4737 | ||
93ae6fdc | 4738 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4739 | |
493e2a69 MS |
4740 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4741 | myaddr, len); | |
da6d8c04 DJ |
4742 | |
4743 | /* Write the entire buffer. */ | |
4744 | ||
4745 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4746 | { | |
4747 | errno = 0; | |
14ce3065 DE |
4748 | ptrace (PTRACE_POKETEXT, pid, |
4749 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4750 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4751 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4752 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
4753 | if (errno) |
4754 | return errno; | |
4755 | } | |
4756 | ||
4757 | return 0; | |
4758 | } | |
2f2893d9 DJ |
4759 | |
4760 | static void | |
4761 | linux_look_up_symbols (void) | |
4762 | { | |
0d62e5e8 | 4763 | #ifdef USE_THREAD_DB |
95954743 PA |
4764 | struct process_info *proc = current_process (); |
4765 | ||
cdbfd419 | 4766 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4767 | return; |
4768 | ||
96d7229d LM |
4769 | /* If the kernel supports tracing clones, then we don't need to |
4770 | use the magic thread event breakpoint to learn about | |
4771 | threads. */ | |
4772 | thread_db_init (!linux_supports_traceclone ()); | |
0d62e5e8 DJ |
4773 | #endif |
4774 | } | |
4775 | ||
e5379b03 | 4776 | static void |
ef57601b | 4777 | linux_request_interrupt (void) |
e5379b03 | 4778 | { |
a1928bad | 4779 | extern unsigned long signal_pid; |
e5379b03 | 4780 | |
78708b7c PA |
4781 | /* Send a SIGINT to the process group. This acts just like the user |
4782 | typed a ^C on the controlling terminal. */ | |
4783 | kill (-signal_pid, SIGINT); | |
e5379b03 DJ |
4784 | } |
4785 | ||
aa691b87 RM |
4786 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4787 | to debugger memory starting at MYADDR. */ | |
4788 | ||
4789 | static int | |
f450004a | 4790 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4791 | { |
4792 | char filename[PATH_MAX]; | |
4793 | int fd, n; | |
0bfdf32f | 4794 | int pid = lwpid_of (current_thread); |
aa691b87 | 4795 | |
6cebaf6e | 4796 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4797 | |
4798 | fd = open (filename, O_RDONLY); | |
4799 | if (fd < 0) | |
4800 | return -1; | |
4801 | ||
4802 | if (offset != (CORE_ADDR) 0 | |
4803 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4804 | n = -1; | |
4805 | else | |
4806 | n = read (fd, myaddr, len); | |
4807 | ||
4808 | close (fd); | |
4809 | ||
4810 | return n; | |
4811 | } | |
4812 | ||
d993e290 PA |
4813 | /* These breakpoint and watchpoint related wrapper functions simply |
4814 | pass on the function call if the target has registered a | |
4815 | corresponding function. */ | |
e013ee27 OF |
4816 | |
4817 | static int | |
802e8e6d PA |
4818 | linux_supports_z_point_type (char z_type) |
4819 | { | |
4820 | return (the_low_target.supports_z_point_type != NULL | |
4821 | && the_low_target.supports_z_point_type (z_type)); | |
4822 | } | |
4823 | ||
4824 | static int | |
4825 | linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
4826 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 4827 | { |
d993e290 | 4828 | if (the_low_target.insert_point != NULL) |
802e8e6d | 4829 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
4830 | else |
4831 | /* Unsupported (see target.h). */ | |
4832 | return 1; | |
4833 | } | |
4834 | ||
4835 | static int | |
802e8e6d PA |
4836 | linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
4837 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 4838 | { |
d993e290 | 4839 | if (the_low_target.remove_point != NULL) |
802e8e6d | 4840 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
4841 | else |
4842 | /* Unsupported (see target.h). */ | |
4843 | return 1; | |
4844 | } | |
4845 | ||
4846 | static int | |
4847 | linux_stopped_by_watchpoint (void) | |
4848 | { | |
0bfdf32f | 4849 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
4850 | |
4851 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
4852 | } |
4853 | ||
4854 | static CORE_ADDR | |
4855 | linux_stopped_data_address (void) | |
4856 | { | |
0bfdf32f | 4857 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
4858 | |
4859 | return lwp->stopped_data_address; | |
e013ee27 OF |
4860 | } |
4861 | ||
db0dfaa0 LM |
4862 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
4863 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
4864 | && defined(PT_TEXT_END_ADDR) | |
4865 | ||
4866 | /* This is only used for targets that define PT_TEXT_ADDR, | |
4867 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
4868 | the target has different ways of acquiring this information, like | |
4869 | loadmaps. */ | |
52fb6437 NS |
4870 | |
4871 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4872 | to tell gdb about. */ | |
4873 | ||
4874 | static int | |
4875 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4876 | { | |
52fb6437 | 4877 | unsigned long text, text_end, data; |
0bfdf32f | 4878 | int pid = lwpid_of (get_thread_lwp (current_thread)); |
52fb6437 NS |
4879 | |
4880 | errno = 0; | |
4881 | ||
b8e1b30e LM |
4882 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
4883 | (PTRACE_TYPE_ARG4) 0); | |
4884 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
4885 | (PTRACE_TYPE_ARG4) 0); | |
4886 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
4887 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
4888 | |
4889 | if (errno == 0) | |
4890 | { | |
4891 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4892 | used by gdb) are relative to the beginning of the program, |
4893 | with the data segment immediately following the text segment. | |
4894 | However, the actual runtime layout in memory may put the data | |
4895 | somewhere else, so when we send gdb a data base-address, we | |
4896 | use the real data base address and subtract the compile-time | |
4897 | data base-address from it (which is just the length of the | |
4898 | text segment). BSS immediately follows data in both | |
4899 | cases. */ | |
52fb6437 NS |
4900 | *text_p = text; |
4901 | *data_p = data - (text_end - text); | |
1b3f6016 | 4902 | |
52fb6437 NS |
4903 | return 1; |
4904 | } | |
52fb6437 NS |
4905 | return 0; |
4906 | } | |
4907 | #endif | |
4908 | ||
07e059b5 VP |
4909 | static int |
4910 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4911 | unsigned char *readbuf, unsigned const char *writebuf, |
4912 | CORE_ADDR offset, int len) | |
07e059b5 | 4913 | { |
d26e3629 | 4914 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4915 | } |
4916 | ||
d0722149 DE |
4917 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4918 | layout of the inferiors' architecture. */ | |
4919 | ||
4920 | static void | |
a5362b9a | 4921 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
4922 | { |
4923 | int done = 0; | |
4924 | ||
4925 | if (the_low_target.siginfo_fixup != NULL) | |
4926 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4927 | ||
4928 | /* If there was no callback, or the callback didn't do anything, | |
4929 | then just do a straight memcpy. */ | |
4930 | if (!done) | |
4931 | { | |
4932 | if (direction == 1) | |
a5362b9a | 4933 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 4934 | else |
a5362b9a | 4935 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
4936 | } |
4937 | } | |
4938 | ||
4aa995e1 PA |
4939 | static int |
4940 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
4941 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
4942 | { | |
d0722149 | 4943 | int pid; |
a5362b9a TS |
4944 | siginfo_t siginfo; |
4945 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 | 4946 | |
0bfdf32f | 4947 | if (current_thread == NULL) |
4aa995e1 PA |
4948 | return -1; |
4949 | ||
0bfdf32f | 4950 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
4951 | |
4952 | if (debug_threads) | |
87ce2a04 DE |
4953 | debug_printf ("%s siginfo for lwp %d.\n", |
4954 | readbuf != NULL ? "Reading" : "Writing", | |
4955 | pid); | |
4aa995e1 | 4956 | |
0adea5f7 | 4957 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
4958 | return -1; |
4959 | ||
b8e1b30e | 4960 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
4961 | return -1; |
4962 | ||
d0722149 DE |
4963 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
4964 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4965 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
4966 | with a 32-bit GDBSERVER, we need to convert it. */ | |
4967 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4968 | ||
4aa995e1 PA |
4969 | if (offset + len > sizeof (siginfo)) |
4970 | len = sizeof (siginfo) - offset; | |
4971 | ||
4972 | if (readbuf != NULL) | |
d0722149 | 4973 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4974 | else |
4975 | { | |
d0722149 DE |
4976 | memcpy (inf_siginfo + offset, writebuf, len); |
4977 | ||
4978 | /* Convert back to ptrace layout before flushing it out. */ | |
4979 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4980 | ||
b8e1b30e | 4981 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
4982 | return -1; |
4983 | } | |
4984 | ||
4985 | return len; | |
4986 | } | |
4987 | ||
bd99dc85 PA |
4988 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4989 | so we notice when children change state; as the handler for the | |
4990 | sigsuspend in my_waitpid. */ | |
4991 | ||
4992 | static void | |
4993 | sigchld_handler (int signo) | |
4994 | { | |
4995 | int old_errno = errno; | |
4996 | ||
4997 | if (debug_threads) | |
e581f2b4 PA |
4998 | { |
4999 | do | |
5000 | { | |
5001 | /* fprintf is not async-signal-safe, so call write | |
5002 | directly. */ | |
5003 | if (write (2, "sigchld_handler\n", | |
5004 | sizeof ("sigchld_handler\n") - 1) < 0) | |
5005 | break; /* just ignore */ | |
5006 | } while (0); | |
5007 | } | |
bd99dc85 PA |
5008 | |
5009 | if (target_is_async_p ()) | |
5010 | async_file_mark (); /* trigger a linux_wait */ | |
5011 | ||
5012 | errno = old_errno; | |
5013 | } | |
5014 | ||
5015 | static int | |
5016 | linux_supports_non_stop (void) | |
5017 | { | |
5018 | return 1; | |
5019 | } | |
5020 | ||
5021 | static int | |
5022 | linux_async (int enable) | |
5023 | { | |
7089dca4 | 5024 | int previous = target_is_async_p (); |
bd99dc85 | 5025 | |
8336d594 | 5026 | if (debug_threads) |
87ce2a04 DE |
5027 | debug_printf ("linux_async (%d), previous=%d\n", |
5028 | enable, previous); | |
8336d594 | 5029 | |
bd99dc85 PA |
5030 | if (previous != enable) |
5031 | { | |
5032 | sigset_t mask; | |
5033 | sigemptyset (&mask); | |
5034 | sigaddset (&mask, SIGCHLD); | |
5035 | ||
5036 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
5037 | ||
5038 | if (enable) | |
5039 | { | |
5040 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
5041 | { |
5042 | linux_event_pipe[0] = -1; | |
5043 | linux_event_pipe[1] = -1; | |
5044 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5045 | ||
5046 | warning ("creating event pipe failed."); | |
5047 | return previous; | |
5048 | } | |
bd99dc85 PA |
5049 | |
5050 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5051 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5052 | ||
5053 | /* Register the event loop handler. */ | |
5054 | add_file_handler (linux_event_pipe[0], | |
5055 | handle_target_event, NULL); | |
5056 | ||
5057 | /* Always trigger a linux_wait. */ | |
5058 | async_file_mark (); | |
5059 | } | |
5060 | else | |
5061 | { | |
5062 | delete_file_handler (linux_event_pipe[0]); | |
5063 | ||
5064 | close (linux_event_pipe[0]); | |
5065 | close (linux_event_pipe[1]); | |
5066 | linux_event_pipe[0] = -1; | |
5067 | linux_event_pipe[1] = -1; | |
5068 | } | |
5069 | ||
5070 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5071 | } | |
5072 | ||
5073 | return previous; | |
5074 | } | |
5075 | ||
5076 | static int | |
5077 | linux_start_non_stop (int nonstop) | |
5078 | { | |
5079 | /* Register or unregister from event-loop accordingly. */ | |
5080 | linux_async (nonstop); | |
aa96c426 GB |
5081 | |
5082 | if (target_is_async_p () != (nonstop != 0)) | |
5083 | return -1; | |
5084 | ||
bd99dc85 PA |
5085 | return 0; |
5086 | } | |
5087 | ||
cf8fd78b PA |
5088 | static int |
5089 | linux_supports_multi_process (void) | |
5090 | { | |
5091 | return 1; | |
5092 | } | |
5093 | ||
03583c20 UW |
5094 | static int |
5095 | linux_supports_disable_randomization (void) | |
5096 | { | |
5097 | #ifdef HAVE_PERSONALITY | |
5098 | return 1; | |
5099 | #else | |
5100 | return 0; | |
5101 | #endif | |
5102 | } | |
efcbbd14 | 5103 | |
d1feda86 YQ |
5104 | static int |
5105 | linux_supports_agent (void) | |
5106 | { | |
5107 | return 1; | |
5108 | } | |
5109 | ||
c2d6af84 PA |
5110 | static int |
5111 | linux_supports_range_stepping (void) | |
5112 | { | |
5113 | if (*the_low_target.supports_range_stepping == NULL) | |
5114 | return 0; | |
5115 | ||
5116 | return (*the_low_target.supports_range_stepping) (); | |
5117 | } | |
5118 | ||
efcbbd14 UW |
5119 | /* Enumerate spufs IDs for process PID. */ |
5120 | static int | |
5121 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
5122 | { | |
5123 | int pos = 0; | |
5124 | int written = 0; | |
5125 | char path[128]; | |
5126 | DIR *dir; | |
5127 | struct dirent *entry; | |
5128 | ||
5129 | sprintf (path, "/proc/%ld/fd", pid); | |
5130 | dir = opendir (path); | |
5131 | if (!dir) | |
5132 | return -1; | |
5133 | ||
5134 | rewinddir (dir); | |
5135 | while ((entry = readdir (dir)) != NULL) | |
5136 | { | |
5137 | struct stat st; | |
5138 | struct statfs stfs; | |
5139 | int fd; | |
5140 | ||
5141 | fd = atoi (entry->d_name); | |
5142 | if (!fd) | |
5143 | continue; | |
5144 | ||
5145 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
5146 | if (stat (path, &st) != 0) | |
5147 | continue; | |
5148 | if (!S_ISDIR (st.st_mode)) | |
5149 | continue; | |
5150 | ||
5151 | if (statfs (path, &stfs) != 0) | |
5152 | continue; | |
5153 | if (stfs.f_type != SPUFS_MAGIC) | |
5154 | continue; | |
5155 | ||
5156 | if (pos >= offset && pos + 4 <= offset + len) | |
5157 | { | |
5158 | *(unsigned int *)(buf + pos - offset) = fd; | |
5159 | written += 4; | |
5160 | } | |
5161 | pos += 4; | |
5162 | } | |
5163 | ||
5164 | closedir (dir); | |
5165 | return written; | |
5166 | } | |
5167 | ||
5168 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5169 | object type, using the /proc file system. */ | |
5170 | static int | |
5171 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
5172 | unsigned const char *writebuf, | |
5173 | CORE_ADDR offset, int len) | |
5174 | { | |
0bfdf32f | 5175 | long pid = lwpid_of (current_thread); |
efcbbd14 UW |
5176 | char buf[128]; |
5177 | int fd = 0; | |
5178 | int ret = 0; | |
5179 | ||
5180 | if (!writebuf && !readbuf) | |
5181 | return -1; | |
5182 | ||
5183 | if (!*annex) | |
5184 | { | |
5185 | if (!readbuf) | |
5186 | return -1; | |
5187 | else | |
5188 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5189 | } | |
5190 | ||
5191 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5192 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5193 | if (fd <= 0) | |
5194 | return -1; | |
5195 | ||
5196 | if (offset != 0 | |
5197 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5198 | { | |
5199 | close (fd); | |
5200 | return 0; | |
5201 | } | |
5202 | ||
5203 | if (writebuf) | |
5204 | ret = write (fd, writebuf, (size_t) len); | |
5205 | else | |
5206 | ret = read (fd, readbuf, (size_t) len); | |
5207 | ||
5208 | close (fd); | |
5209 | return ret; | |
5210 | } | |
5211 | ||
723b724b | 5212 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5213 | struct target_loadseg |
5214 | { | |
5215 | /* Core address to which the segment is mapped. */ | |
5216 | Elf32_Addr addr; | |
5217 | /* VMA recorded in the program header. */ | |
5218 | Elf32_Addr p_vaddr; | |
5219 | /* Size of this segment in memory. */ | |
5220 | Elf32_Word p_memsz; | |
5221 | }; | |
5222 | ||
723b724b | 5223 | # if defined PT_GETDSBT |
78d85199 YQ |
5224 | struct target_loadmap |
5225 | { | |
5226 | /* Protocol version number, must be zero. */ | |
5227 | Elf32_Word version; | |
5228 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5229 | unsigned *dsbt_table; | |
5230 | unsigned dsbt_size, dsbt_index; | |
5231 | /* Number of segments in this map. */ | |
5232 | Elf32_Word nsegs; | |
5233 | /* The actual memory map. */ | |
5234 | struct target_loadseg segs[/*nsegs*/]; | |
5235 | }; | |
723b724b MF |
5236 | # define LINUX_LOADMAP PT_GETDSBT |
5237 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5238 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5239 | # else | |
5240 | struct target_loadmap | |
5241 | { | |
5242 | /* Protocol version number, must be zero. */ | |
5243 | Elf32_Half version; | |
5244 | /* Number of segments in this map. */ | |
5245 | Elf32_Half nsegs; | |
5246 | /* The actual memory map. */ | |
5247 | struct target_loadseg segs[/*nsegs*/]; | |
5248 | }; | |
5249 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5250 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5251 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5252 | # endif | |
78d85199 | 5253 | |
78d85199 YQ |
5254 | static int |
5255 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5256 | unsigned char *myaddr, unsigned int len) | |
5257 | { | |
0bfdf32f | 5258 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
5259 | int addr = -1; |
5260 | struct target_loadmap *data = NULL; | |
5261 | unsigned int actual_length, copy_length; | |
5262 | ||
5263 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5264 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5265 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5266 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5267 | else |
5268 | return -1; | |
5269 | ||
723b724b | 5270 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5271 | return -1; |
5272 | ||
5273 | if (data == NULL) | |
5274 | return -1; | |
5275 | ||
5276 | actual_length = sizeof (struct target_loadmap) | |
5277 | + sizeof (struct target_loadseg) * data->nsegs; | |
5278 | ||
5279 | if (offset < 0 || offset > actual_length) | |
5280 | return -1; | |
5281 | ||
5282 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5283 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5284 | return copy_length; | |
5285 | } | |
723b724b MF |
5286 | #else |
5287 | # define linux_read_loadmap NULL | |
5288 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5289 | |
1570b33e L |
5290 | static void |
5291 | linux_process_qsupported (const char *query) | |
5292 | { | |
5293 | if (the_low_target.process_qsupported != NULL) | |
5294 | the_low_target.process_qsupported (query); | |
5295 | } | |
5296 | ||
219f2f23 PA |
5297 | static int |
5298 | linux_supports_tracepoints (void) | |
5299 | { | |
5300 | if (*the_low_target.supports_tracepoints == NULL) | |
5301 | return 0; | |
5302 | ||
5303 | return (*the_low_target.supports_tracepoints) (); | |
5304 | } | |
5305 | ||
5306 | static CORE_ADDR | |
5307 | linux_read_pc (struct regcache *regcache) | |
5308 | { | |
5309 | if (the_low_target.get_pc == NULL) | |
5310 | return 0; | |
5311 | ||
5312 | return (*the_low_target.get_pc) (regcache); | |
5313 | } | |
5314 | ||
5315 | static void | |
5316 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5317 | { | |
5318 | gdb_assert (the_low_target.set_pc != NULL); | |
5319 | ||
5320 | (*the_low_target.set_pc) (regcache, pc); | |
5321 | } | |
5322 | ||
8336d594 PA |
5323 | static int |
5324 | linux_thread_stopped (struct thread_info *thread) | |
5325 | { | |
5326 | return get_thread_lwp (thread)->stopped; | |
5327 | } | |
5328 | ||
5329 | /* This exposes stop-all-threads functionality to other modules. */ | |
5330 | ||
5331 | static void | |
7984d532 | 5332 | linux_pause_all (int freeze) |
8336d594 | 5333 | { |
7984d532 PA |
5334 | stop_all_lwps (freeze, NULL); |
5335 | } | |
5336 | ||
5337 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5338 | modules. */ | |
5339 | ||
5340 | static void | |
5341 | linux_unpause_all (int unfreeze) | |
5342 | { | |
5343 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5344 | } |
5345 | ||
90d74c30 PA |
5346 | static int |
5347 | linux_prepare_to_access_memory (void) | |
5348 | { | |
5349 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5350 | running LWP. */ | |
5351 | if (non_stop) | |
5352 | linux_pause_all (1); | |
5353 | return 0; | |
5354 | } | |
5355 | ||
5356 | static void | |
0146f85b | 5357 | linux_done_accessing_memory (void) |
90d74c30 PA |
5358 | { |
5359 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5360 | running LWP. */ | |
5361 | if (non_stop) | |
5362 | linux_unpause_all (1); | |
5363 | } | |
5364 | ||
fa593d66 PA |
5365 | static int |
5366 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5367 | CORE_ADDR collector, | |
5368 | CORE_ADDR lockaddr, | |
5369 | ULONGEST orig_size, | |
5370 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5371 | CORE_ADDR *trampoline, |
5372 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5373 | unsigned char *jjump_pad_insn, |
5374 | ULONGEST *jjump_pad_insn_size, | |
5375 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5376 | CORE_ADDR *adjusted_insn_addr_end, |
5377 | char *err) | |
fa593d66 PA |
5378 | { |
5379 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5380 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5381 | jump_entry, trampoline, trampoline_size, |
5382 | jjump_pad_insn, jjump_pad_insn_size, | |
5383 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5384 | err); | |
fa593d66 PA |
5385 | } |
5386 | ||
6a271cae PA |
5387 | static struct emit_ops * |
5388 | linux_emit_ops (void) | |
5389 | { | |
5390 | if (the_low_target.emit_ops != NULL) | |
5391 | return (*the_low_target.emit_ops) (); | |
5392 | else | |
5393 | return NULL; | |
5394 | } | |
5395 | ||
405f8e94 SS |
5396 | static int |
5397 | linux_get_min_fast_tracepoint_insn_len (void) | |
5398 | { | |
5399 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5400 | } | |
5401 | ||
2268b414 JK |
5402 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5403 | ||
5404 | static int | |
5405 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5406 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5407 | { | |
5408 | char filename[PATH_MAX]; | |
5409 | int fd; | |
5410 | const int auxv_size = is_elf64 | |
5411 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5412 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5413 | ||
5414 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5415 | ||
5416 | fd = open (filename, O_RDONLY); | |
5417 | if (fd < 0) | |
5418 | return 1; | |
5419 | ||
5420 | *phdr_memaddr = 0; | |
5421 | *num_phdr = 0; | |
5422 | while (read (fd, buf, auxv_size) == auxv_size | |
5423 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5424 | { | |
5425 | if (is_elf64) | |
5426 | { | |
5427 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5428 | ||
5429 | switch (aux->a_type) | |
5430 | { | |
5431 | case AT_PHDR: | |
5432 | *phdr_memaddr = aux->a_un.a_val; | |
5433 | break; | |
5434 | case AT_PHNUM: | |
5435 | *num_phdr = aux->a_un.a_val; | |
5436 | break; | |
5437 | } | |
5438 | } | |
5439 | else | |
5440 | { | |
5441 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5442 | ||
5443 | switch (aux->a_type) | |
5444 | { | |
5445 | case AT_PHDR: | |
5446 | *phdr_memaddr = aux->a_un.a_val; | |
5447 | break; | |
5448 | case AT_PHNUM: | |
5449 | *num_phdr = aux->a_un.a_val; | |
5450 | break; | |
5451 | } | |
5452 | } | |
5453 | } | |
5454 | ||
5455 | close (fd); | |
5456 | ||
5457 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5458 | { | |
5459 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5460 | "phdr_memaddr = %ld, phdr_num = %d", | |
5461 | (long) *phdr_memaddr, *num_phdr); | |
5462 | return 2; | |
5463 | } | |
5464 | ||
5465 | return 0; | |
5466 | } | |
5467 | ||
5468 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5469 | ||
5470 | static CORE_ADDR | |
5471 | get_dynamic (const int pid, const int is_elf64) | |
5472 | { | |
5473 | CORE_ADDR phdr_memaddr, relocation; | |
5474 | int num_phdr, i; | |
5475 | unsigned char *phdr_buf; | |
5476 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5477 | ||
5478 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5479 | return 0; | |
5480 | ||
5481 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5482 | phdr_buf = alloca (num_phdr * phdr_size); | |
5483 | ||
5484 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5485 | return 0; | |
5486 | ||
5487 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5488 | non-zero for PIE ones. */ | |
5489 | relocation = -1; | |
5490 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5491 | if (is_elf64) | |
5492 | { | |
5493 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5494 | ||
5495 | if (p->p_type == PT_PHDR) | |
5496 | relocation = phdr_memaddr - p->p_vaddr; | |
5497 | } | |
5498 | else | |
5499 | { | |
5500 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5501 | ||
5502 | if (p->p_type == PT_PHDR) | |
5503 | relocation = phdr_memaddr - p->p_vaddr; | |
5504 | } | |
5505 | ||
5506 | if (relocation == -1) | |
5507 | { | |
e237a7e2 JK |
5508 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
5509 | any real world executables, including PIE executables, have always | |
5510 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
5511 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
5512 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
5513 | ||
5514 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
5515 | ||
5516 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
5517 | ||
2268b414 JK |
5518 | return 0; |
5519 | } | |
5520 | ||
5521 | for (i = 0; i < num_phdr; i++) | |
5522 | { | |
5523 | if (is_elf64) | |
5524 | { | |
5525 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5526 | ||
5527 | if (p->p_type == PT_DYNAMIC) | |
5528 | return p->p_vaddr + relocation; | |
5529 | } | |
5530 | else | |
5531 | { | |
5532 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5533 | ||
5534 | if (p->p_type == PT_DYNAMIC) | |
5535 | return p->p_vaddr + relocation; | |
5536 | } | |
5537 | } | |
5538 | ||
5539 | return 0; | |
5540 | } | |
5541 | ||
5542 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
5543 | can be 0 if the inferior does not yet have the library list initialized. |
5544 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
5545 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
5546 | |
5547 | static CORE_ADDR | |
5548 | get_r_debug (const int pid, const int is_elf64) | |
5549 | { | |
5550 | CORE_ADDR dynamic_memaddr; | |
5551 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5552 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 5553 | CORE_ADDR map = -1; |
2268b414 JK |
5554 | |
5555 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5556 | if (dynamic_memaddr == 0) | |
367ba2c2 | 5557 | return map; |
2268b414 JK |
5558 | |
5559 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5560 | { | |
5561 | if (is_elf64) | |
5562 | { | |
5563 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
75f62ce7 | 5564 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5565 | union |
5566 | { | |
5567 | Elf64_Xword map; | |
5568 | unsigned char buf[sizeof (Elf64_Xword)]; | |
5569 | } | |
5570 | rld_map; | |
5571 | ||
5572 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5573 | { | |
5574 | if (linux_read_memory (dyn->d_un.d_val, | |
5575 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5576 | return rld_map.map; | |
5577 | else | |
5578 | break; | |
5579 | } | |
75f62ce7 | 5580 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5581 | |
367ba2c2 MR |
5582 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5583 | map = dyn->d_un.d_val; | |
2268b414 JK |
5584 | |
5585 | if (dyn->d_tag == DT_NULL) | |
5586 | break; | |
5587 | } | |
5588 | else | |
5589 | { | |
5590 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
75f62ce7 | 5591 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5592 | union |
5593 | { | |
5594 | Elf32_Word map; | |
5595 | unsigned char buf[sizeof (Elf32_Word)]; | |
5596 | } | |
5597 | rld_map; | |
5598 | ||
5599 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5600 | { | |
5601 | if (linux_read_memory (dyn->d_un.d_val, | |
5602 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5603 | return rld_map.map; | |
5604 | else | |
5605 | break; | |
5606 | } | |
75f62ce7 | 5607 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5608 | |
367ba2c2 MR |
5609 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5610 | map = dyn->d_un.d_val; | |
2268b414 JK |
5611 | |
5612 | if (dyn->d_tag == DT_NULL) | |
5613 | break; | |
5614 | } | |
5615 | ||
5616 | dynamic_memaddr += dyn_size; | |
5617 | } | |
5618 | ||
367ba2c2 | 5619 | return map; |
2268b414 JK |
5620 | } |
5621 | ||
5622 | /* Read one pointer from MEMADDR in the inferior. */ | |
5623 | ||
5624 | static int | |
5625 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5626 | { | |
485f1ee4 PA |
5627 | int ret; |
5628 | ||
5629 | /* Go through a union so this works on either big or little endian | |
5630 | hosts, when the inferior's pointer size is smaller than the size | |
5631 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
5632 | same of the superior's. */ | |
5633 | union | |
5634 | { | |
5635 | CORE_ADDR core_addr; | |
5636 | unsigned int ui; | |
5637 | unsigned char uc; | |
5638 | } addr; | |
5639 | ||
5640 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
5641 | if (ret == 0) | |
5642 | { | |
5643 | if (ptr_size == sizeof (CORE_ADDR)) | |
5644 | *ptr = addr.core_addr; | |
5645 | else if (ptr_size == sizeof (unsigned int)) | |
5646 | *ptr = addr.ui; | |
5647 | else | |
5648 | gdb_assert_not_reached ("unhandled pointer size"); | |
5649 | } | |
5650 | return ret; | |
2268b414 JK |
5651 | } |
5652 | ||
5653 | struct link_map_offsets | |
5654 | { | |
5655 | /* Offset and size of r_debug.r_version. */ | |
5656 | int r_version_offset; | |
5657 | ||
5658 | /* Offset and size of r_debug.r_map. */ | |
5659 | int r_map_offset; | |
5660 | ||
5661 | /* Offset to l_addr field in struct link_map. */ | |
5662 | int l_addr_offset; | |
5663 | ||
5664 | /* Offset to l_name field in struct link_map. */ | |
5665 | int l_name_offset; | |
5666 | ||
5667 | /* Offset to l_ld field in struct link_map. */ | |
5668 | int l_ld_offset; | |
5669 | ||
5670 | /* Offset to l_next field in struct link_map. */ | |
5671 | int l_next_offset; | |
5672 | ||
5673 | /* Offset to l_prev field in struct link_map. */ | |
5674 | int l_prev_offset; | |
5675 | }; | |
5676 | ||
fb723180 | 5677 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
5678 | |
5679 | static int | |
5680 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5681 | unsigned const char *writebuf, | |
5682 | CORE_ADDR offset, int len) | |
5683 | { | |
5684 | char *document; | |
5685 | unsigned document_len; | |
5686 | struct process_info_private *const priv = current_process ()->private; | |
5687 | char filename[PATH_MAX]; | |
5688 | int pid, is_elf64; | |
5689 | ||
5690 | static const struct link_map_offsets lmo_32bit_offsets = | |
5691 | { | |
5692 | 0, /* r_version offset. */ | |
5693 | 4, /* r_debug.r_map offset. */ | |
5694 | 0, /* l_addr offset in link_map. */ | |
5695 | 4, /* l_name offset in link_map. */ | |
5696 | 8, /* l_ld offset in link_map. */ | |
5697 | 12, /* l_next offset in link_map. */ | |
5698 | 16 /* l_prev offset in link_map. */ | |
5699 | }; | |
5700 | ||
5701 | static const struct link_map_offsets lmo_64bit_offsets = | |
5702 | { | |
5703 | 0, /* r_version offset. */ | |
5704 | 8, /* r_debug.r_map offset. */ | |
5705 | 0, /* l_addr offset in link_map. */ | |
5706 | 8, /* l_name offset in link_map. */ | |
5707 | 16, /* l_ld offset in link_map. */ | |
5708 | 24, /* l_next offset in link_map. */ | |
5709 | 32 /* l_prev offset in link_map. */ | |
5710 | }; | |
5711 | const struct link_map_offsets *lmo; | |
214d508e | 5712 | unsigned int machine; |
b1fbec62 GB |
5713 | int ptr_size; |
5714 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
5715 | int allocated = 1024; | |
5716 | char *p; | |
5717 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
5718 | int header_done = 0; | |
2268b414 JK |
5719 | |
5720 | if (writebuf != NULL) | |
5721 | return -2; | |
5722 | if (readbuf == NULL) | |
5723 | return -1; | |
5724 | ||
0bfdf32f | 5725 | pid = lwpid_of (current_thread); |
2268b414 | 5726 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 5727 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 5728 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 5729 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 5730 | |
b1fbec62 GB |
5731 | while (annex[0] != '\0') |
5732 | { | |
5733 | const char *sep; | |
5734 | CORE_ADDR *addrp; | |
5735 | int len; | |
2268b414 | 5736 | |
b1fbec62 GB |
5737 | sep = strchr (annex, '='); |
5738 | if (sep == NULL) | |
5739 | break; | |
0c5bf5a9 | 5740 | |
b1fbec62 GB |
5741 | len = sep - annex; |
5742 | if (len == 5 && strncmp (annex, "start", 5) == 0) | |
5743 | addrp = &lm_addr; | |
5744 | else if (len == 4 && strncmp (annex, "prev", 4) == 0) | |
5745 | addrp = &lm_prev; | |
5746 | else | |
5747 | { | |
5748 | annex = strchr (sep, ';'); | |
5749 | if (annex == NULL) | |
5750 | break; | |
5751 | annex++; | |
5752 | continue; | |
5753 | } | |
5754 | ||
5755 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 5756 | } |
b1fbec62 GB |
5757 | |
5758 | if (lm_addr == 0) | |
2268b414 | 5759 | { |
b1fbec62 GB |
5760 | int r_version = 0; |
5761 | ||
5762 | if (priv->r_debug == 0) | |
5763 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5764 | ||
5765 | /* We failed to find DT_DEBUG. Such situation will not change | |
5766 | for this inferior - do not retry it. Report it to GDB as | |
5767 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
5768 | if (priv->r_debug == (CORE_ADDR) -1) | |
5769 | return -1; | |
5770 | ||
5771 | if (priv->r_debug != 0) | |
2268b414 | 5772 | { |
b1fbec62 GB |
5773 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
5774 | (unsigned char *) &r_version, | |
5775 | sizeof (r_version)) != 0 | |
5776 | || r_version != 1) | |
5777 | { | |
5778 | warning ("unexpected r_debug version %d", r_version); | |
5779 | } | |
5780 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5781 | &lm_addr, ptr_size) != 0) | |
5782 | { | |
5783 | warning ("unable to read r_map from 0x%lx", | |
5784 | (long) priv->r_debug + lmo->r_map_offset); | |
5785 | } | |
2268b414 | 5786 | } |
b1fbec62 | 5787 | } |
2268b414 | 5788 | |
b1fbec62 GB |
5789 | document = xmalloc (allocated); |
5790 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
5791 | p = document + strlen (document); | |
5792 | ||
5793 | while (lm_addr | |
5794 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
5795 | &l_name, ptr_size) == 0 | |
5796 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
5797 | &l_addr, ptr_size) == 0 | |
5798 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
5799 | &l_ld, ptr_size) == 0 | |
5800 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
5801 | &l_prev, ptr_size) == 0 | |
5802 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
5803 | &l_next, ptr_size) == 0) | |
5804 | { | |
5805 | unsigned char libname[PATH_MAX]; | |
5806 | ||
5807 | if (lm_prev != l_prev) | |
2268b414 | 5808 | { |
b1fbec62 GB |
5809 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
5810 | (long) lm_prev, (long) l_prev); | |
5811 | break; | |
2268b414 JK |
5812 | } |
5813 | ||
d878444c JK |
5814 | /* Ignore the first entry even if it has valid name as the first entry |
5815 | corresponds to the main executable. The first entry should not be | |
5816 | skipped if the dynamic loader was loaded late by a static executable | |
5817 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
5818 | executable does not have PT_DYNAMIC present and this function already | |
5819 | exited above due to failed get_r_debug. */ | |
5820 | if (lm_prev == 0) | |
2268b414 | 5821 | { |
d878444c JK |
5822 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
5823 | p = p + strlen (p); | |
5824 | } | |
5825 | else | |
5826 | { | |
5827 | /* Not checking for error because reading may stop before | |
5828 | we've got PATH_MAX worth of characters. */ | |
5829 | libname[0] = '\0'; | |
5830 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
5831 | libname[sizeof (libname) - 1] = '\0'; | |
5832 | if (libname[0] != '\0') | |
2268b414 | 5833 | { |
d878444c JK |
5834 | /* 6x the size for xml_escape_text below. */ |
5835 | size_t len = 6 * strlen ((char *) libname); | |
5836 | char *name; | |
2268b414 | 5837 | |
d878444c JK |
5838 | if (!header_done) |
5839 | { | |
5840 | /* Terminate `<library-list-svr4'. */ | |
5841 | *p++ = '>'; | |
5842 | header_done = 1; | |
5843 | } | |
2268b414 | 5844 | |
d878444c JK |
5845 | while (allocated < p - document + len + 200) |
5846 | { | |
5847 | /* Expand to guarantee sufficient storage. */ | |
5848 | uintptr_t document_len = p - document; | |
2268b414 | 5849 | |
d878444c JK |
5850 | document = xrealloc (document, 2 * allocated); |
5851 | allocated *= 2; | |
5852 | p = document + document_len; | |
5853 | } | |
5854 | ||
5855 | name = xml_escape_text ((char *) libname); | |
5856 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
5857 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
5858 | name, (unsigned long) lm_addr, | |
5859 | (unsigned long) l_addr, (unsigned long) l_ld); | |
5860 | free (name); | |
5861 | } | |
0afae3cf | 5862 | } |
b1fbec62 GB |
5863 | |
5864 | lm_prev = lm_addr; | |
5865 | lm_addr = l_next; | |
2268b414 JK |
5866 | } |
5867 | ||
b1fbec62 GB |
5868 | if (!header_done) |
5869 | { | |
5870 | /* Empty list; terminate `<library-list-svr4'. */ | |
5871 | strcpy (p, "/>"); | |
5872 | } | |
5873 | else | |
5874 | strcpy (p, "</library-list-svr4>"); | |
5875 | ||
2268b414 JK |
5876 | document_len = strlen (document); |
5877 | if (offset < document_len) | |
5878 | document_len -= offset; | |
5879 | else | |
5880 | document_len = 0; | |
5881 | if (len > document_len) | |
5882 | len = document_len; | |
5883 | ||
5884 | memcpy (readbuf, document + offset, len); | |
5885 | xfree (document); | |
5886 | ||
5887 | return len; | |
5888 | } | |
5889 | ||
9accd112 MM |
5890 | #ifdef HAVE_LINUX_BTRACE |
5891 | ||
969c39fb | 5892 | /* See to_enable_btrace target method. */ |
9accd112 MM |
5893 | |
5894 | static struct btrace_target_info * | |
5895 | linux_low_enable_btrace (ptid_t ptid) | |
5896 | { | |
5897 | struct btrace_target_info *tinfo; | |
5898 | ||
5899 | tinfo = linux_enable_btrace (ptid); | |
3aee8918 | 5900 | |
9accd112 | 5901 | if (tinfo != NULL) |
3aee8918 PA |
5902 | { |
5903 | struct thread_info *thread = find_thread_ptid (ptid); | |
5904 | struct regcache *regcache = get_thread_regcache (thread, 0); | |
5905 | ||
5906 | tinfo->ptr_bits = register_size (regcache->tdesc, 0) * 8; | |
5907 | } | |
9accd112 MM |
5908 | |
5909 | return tinfo; | |
5910 | } | |
5911 | ||
969c39fb | 5912 | /* See to_disable_btrace target method. */ |
9accd112 | 5913 | |
969c39fb MM |
5914 | static int |
5915 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
5916 | { | |
5917 | enum btrace_error err; | |
5918 | ||
5919 | err = linux_disable_btrace (tinfo); | |
5920 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
5921 | } | |
5922 | ||
5923 | /* See to_read_btrace target method. */ | |
5924 | ||
5925 | static int | |
9accd112 MM |
5926 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
5927 | int type) | |
5928 | { | |
5929 | VEC (btrace_block_s) *btrace; | |
5930 | struct btrace_block *block; | |
969c39fb | 5931 | enum btrace_error err; |
9accd112 MM |
5932 | int i; |
5933 | ||
969c39fb MM |
5934 | btrace = NULL; |
5935 | err = linux_read_btrace (&btrace, tinfo, type); | |
5936 | if (err != BTRACE_ERR_NONE) | |
5937 | { | |
5938 | if (err == BTRACE_ERR_OVERFLOW) | |
5939 | buffer_grow_str0 (buffer, "E.Overflow."); | |
5940 | else | |
5941 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
5942 | ||
5943 | return -1; | |
5944 | } | |
9accd112 MM |
5945 | |
5946 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
5947 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
5948 | ||
5949 | for (i = 0; VEC_iterate (btrace_block_s, btrace, i, block); i++) | |
5950 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
5951 | paddress (block->begin), paddress (block->end)); | |
5952 | ||
969c39fb | 5953 | buffer_grow_str0 (buffer, "</btrace>\n"); |
9accd112 MM |
5954 | |
5955 | VEC_free (btrace_block_s, btrace); | |
969c39fb MM |
5956 | |
5957 | return 0; | |
9accd112 MM |
5958 | } |
5959 | #endif /* HAVE_LINUX_BTRACE */ | |
5960 | ||
ce3a066d DJ |
5961 | static struct target_ops linux_target_ops = { |
5962 | linux_create_inferior, | |
5963 | linux_attach, | |
5964 | linux_kill, | |
6ad8ae5c | 5965 | linux_detach, |
8336d594 | 5966 | linux_mourn, |
444d6139 | 5967 | linux_join, |
ce3a066d DJ |
5968 | linux_thread_alive, |
5969 | linux_resume, | |
5970 | linux_wait, | |
5971 | linux_fetch_registers, | |
5972 | linux_store_registers, | |
90d74c30 | 5973 | linux_prepare_to_access_memory, |
0146f85b | 5974 | linux_done_accessing_memory, |
ce3a066d DJ |
5975 | linux_read_memory, |
5976 | linux_write_memory, | |
2f2893d9 | 5977 | linux_look_up_symbols, |
ef57601b | 5978 | linux_request_interrupt, |
aa691b87 | 5979 | linux_read_auxv, |
802e8e6d | 5980 | linux_supports_z_point_type, |
d993e290 PA |
5981 | linux_insert_point, |
5982 | linux_remove_point, | |
e013ee27 OF |
5983 | linux_stopped_by_watchpoint, |
5984 | linux_stopped_data_address, | |
db0dfaa0 LM |
5985 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
5986 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
5987 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 5988 | linux_read_offsets, |
dae5f5cf DJ |
5989 | #else |
5990 | NULL, | |
5991 | #endif | |
5992 | #ifdef USE_THREAD_DB | |
5993 | thread_db_get_tls_address, | |
5994 | #else | |
5995 | NULL, | |
52fb6437 | 5996 | #endif |
efcbbd14 | 5997 | linux_qxfer_spu, |
59a016f0 | 5998 | hostio_last_error_from_errno, |
07e059b5 | 5999 | linux_qxfer_osdata, |
4aa995e1 | 6000 | linux_xfer_siginfo, |
bd99dc85 PA |
6001 | linux_supports_non_stop, |
6002 | linux_async, | |
6003 | linux_start_non_stop, | |
cdbfd419 PP |
6004 | linux_supports_multi_process, |
6005 | #ifdef USE_THREAD_DB | |
dc146f7c | 6006 | thread_db_handle_monitor_command, |
cdbfd419 | 6007 | #else |
dc146f7c | 6008 | NULL, |
cdbfd419 | 6009 | #endif |
d26e3629 | 6010 | linux_common_core_of_thread, |
78d85199 | 6011 | linux_read_loadmap, |
219f2f23 PA |
6012 | linux_process_qsupported, |
6013 | linux_supports_tracepoints, | |
6014 | linux_read_pc, | |
8336d594 PA |
6015 | linux_write_pc, |
6016 | linux_thread_stopped, | |
7984d532 | 6017 | NULL, |
711e434b | 6018 | linux_pause_all, |
7984d532 | 6019 | linux_unpause_all, |
fa593d66 PA |
6020 | linux_cancel_breakpoints, |
6021 | linux_stabilize_threads, | |
6a271cae | 6022 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
6023 | linux_emit_ops, |
6024 | linux_supports_disable_randomization, | |
405f8e94 | 6025 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 6026 | linux_qxfer_libraries_svr4, |
d1feda86 | 6027 | linux_supports_agent, |
9accd112 MM |
6028 | #ifdef HAVE_LINUX_BTRACE |
6029 | linux_supports_btrace, | |
6030 | linux_low_enable_btrace, | |
969c39fb | 6031 | linux_low_disable_btrace, |
9accd112 MM |
6032 | linux_low_read_btrace, |
6033 | #else | |
6034 | NULL, | |
6035 | NULL, | |
6036 | NULL, | |
6037 | NULL, | |
9accd112 | 6038 | #endif |
c2d6af84 | 6039 | linux_supports_range_stepping, |
ce3a066d DJ |
6040 | }; |
6041 | ||
0d62e5e8 DJ |
6042 | static void |
6043 | linux_init_signals () | |
6044 | { | |
6045 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
6046 | to find what the cancel signal actually is. */ | |
1a981360 | 6047 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 6048 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 6049 | #endif |
0d62e5e8 DJ |
6050 | } |
6051 | ||
3aee8918 PA |
6052 | #ifdef HAVE_LINUX_REGSETS |
6053 | void | |
6054 | initialize_regsets_info (struct regsets_info *info) | |
6055 | { | |
6056 | for (info->num_regsets = 0; | |
6057 | info->regsets[info->num_regsets].size >= 0; | |
6058 | info->num_regsets++) | |
6059 | ; | |
3aee8918 PA |
6060 | } |
6061 | #endif | |
6062 | ||
da6d8c04 DJ |
6063 | void |
6064 | initialize_low (void) | |
6065 | { | |
bd99dc85 PA |
6066 | struct sigaction sigchld_action; |
6067 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 6068 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
6069 | set_breakpoint_data (the_low_target.breakpoint, |
6070 | the_low_target.breakpoint_len); | |
0d62e5e8 | 6071 | linux_init_signals (); |
aa7c7447 | 6072 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
6073 | |
6074 | sigchld_action.sa_handler = sigchld_handler; | |
6075 | sigemptyset (&sigchld_action.sa_mask); | |
6076 | sigchld_action.sa_flags = SA_RESTART; | |
6077 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
6078 | |
6079 | initialize_low_arch (); | |
da6d8c04 | 6080 | } |