Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
545587ee | 2 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, |
6aba47ca | 3 | 2006, 2007 Free Software Foundation, Inc. |
da6d8c04 DJ |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
6f0f660e EZ |
19 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. */ | |
da6d8c04 DJ |
21 | |
22 | #include "server.h" | |
58caa3dc | 23 | #include "linux-low.h" |
da6d8c04 | 24 | |
58caa3dc | 25 | #include <sys/wait.h> |
da6d8c04 DJ |
26 | #include <stdio.h> |
27 | #include <sys/param.h> | |
28 | #include <sys/dir.h> | |
29 | #include <sys/ptrace.h> | |
30 | #include <sys/user.h> | |
31 | #include <signal.h> | |
32 | #include <sys/ioctl.h> | |
33 | #include <fcntl.h> | |
d07c63e7 | 34 | #include <string.h> |
0a30fbc4 DJ |
35 | #include <stdlib.h> |
36 | #include <unistd.h> | |
fa6a77dc | 37 | #include <errno.h> |
fd500816 | 38 | #include <sys/syscall.h> |
da6d8c04 | 39 | |
32ca6d61 DJ |
40 | #ifndef PTRACE_GETSIGINFO |
41 | # define PTRACE_GETSIGINFO 0x4202 | |
42 | # define PTRACE_SETSIGINFO 0x4203 | |
43 | #endif | |
44 | ||
42c81e2a DJ |
45 | #ifdef __UCLIBC__ |
46 | #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) | |
47 | #define HAS_NOMMU | |
48 | #endif | |
49 | #endif | |
50 | ||
0d62e5e8 DJ |
51 | /* ``all_threads'' is keyed by the LWP ID - it should be the thread ID instead, |
52 | however. This requires changing the ID in place when we go from !using_threads | |
53 | to using_threads, immediately. | |
611cb4a5 | 54 | |
0d62e5e8 DJ |
55 | ``all_processes'' is keyed by the process ID - which on Linux is (presently) |
56 | the same as the LWP ID. */ | |
57 | ||
58 | struct inferior_list all_processes; | |
59 | ||
60 | /* FIXME this is a bit of a hack, and could be removed. */ | |
61 | int stopping_threads; | |
62 | ||
63 | /* FIXME make into a target method? */ | |
64 | int using_threads; | |
65 | ||
66 | static void linux_resume_one_process (struct inferior_list_entry *entry, | |
32ca6d61 | 67 | int step, int signal, siginfo_t *info); |
64386c31 | 68 | static void linux_resume (struct thread_resume *resume_info); |
0d62e5e8 DJ |
69 | static void stop_all_processes (void); |
70 | static int linux_wait_for_event (struct thread_info *child); | |
ae13219e | 71 | static int check_removed_breakpoint (struct process_info *event_child); |
0d62e5e8 DJ |
72 | |
73 | struct pending_signals | |
74 | { | |
75 | int signal; | |
32ca6d61 | 76 | siginfo_t info; |
0d62e5e8 DJ |
77 | struct pending_signals *prev; |
78 | }; | |
611cb4a5 | 79 | |
d844cde6 | 80 | #define PTRACE_ARG3_TYPE long |
c6ecbae5 | 81 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 82 | |
58caa3dc DJ |
83 | #ifdef HAVE_LINUX_REGSETS |
84 | static int use_regsets_p = 1; | |
85 | #endif | |
86 | ||
0d62e5e8 DJ |
87 | #define pid_of(proc) ((proc)->head.id) |
88 | ||
89 | /* FIXME: Delete eventually. */ | |
90 | #define inferior_pid (pid_of (get_thread_process (current_inferior))) | |
91 | ||
92 | /* This function should only be called if the process got a SIGTRAP. | |
93 | The SIGTRAP could mean several things. | |
94 | ||
95 | On i386, where decr_pc_after_break is non-zero: | |
96 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
97 | we will get only the one SIGTRAP (even if the instruction we | |
98 | stepped over was a breakpoint). The value of $eip will be the | |
99 | next instruction. | |
100 | If we continue the process using PTRACE_CONT, we will get a | |
101 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
102 | the instruction after the breakpoint (i.e. needs to be | |
103 | decremented). If we report the SIGTRAP to GDB, we must also | |
104 | report the undecremented PC. If we cancel the SIGTRAP, we | |
105 | must resume at the decremented PC. | |
106 | ||
107 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
108 | with hardware or kernel single-step: | |
109 | If we single-step over a breakpoint instruction, our PC will | |
110 | point at the following instruction. If we continue and hit a | |
111 | breakpoint instruction, our PC will point at the breakpoint | |
112 | instruction. */ | |
113 | ||
114 | static CORE_ADDR | |
115 | get_stop_pc (void) | |
116 | { | |
117 | CORE_ADDR stop_pc = (*the_low_target.get_pc) (); | |
118 | ||
119 | if (get_thread_process (current_inferior)->stepping) | |
120 | return stop_pc; | |
121 | else | |
122 | return stop_pc - the_low_target.decr_pc_after_break; | |
123 | } | |
ce3a066d | 124 | |
0d62e5e8 | 125 | static void * |
a1928bad | 126 | add_process (unsigned long pid) |
611cb4a5 | 127 | { |
0d62e5e8 DJ |
128 | struct process_info *process; |
129 | ||
130 | process = (struct process_info *) malloc (sizeof (*process)); | |
131 | memset (process, 0, sizeof (*process)); | |
132 | ||
133 | process->head.id = pid; | |
134 | ||
135 | /* Default to tid == lwpid == pid. */ | |
136 | process->tid = pid; | |
137 | process->lwpid = pid; | |
138 | ||
139 | add_inferior_to_list (&all_processes, &process->head); | |
140 | ||
141 | return process; | |
142 | } | |
611cb4a5 | 143 | |
da6d8c04 DJ |
144 | /* Start an inferior process and returns its pid. |
145 | ALLARGS is a vector of program-name and args. */ | |
146 | ||
ce3a066d DJ |
147 | static int |
148 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 149 | { |
0d62e5e8 | 150 | void *new_process; |
da6d8c04 DJ |
151 | int pid; |
152 | ||
42c81e2a | 153 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
154 | pid = vfork (); |
155 | #else | |
da6d8c04 | 156 | pid = fork (); |
52fb6437 | 157 | #endif |
da6d8c04 DJ |
158 | if (pid < 0) |
159 | perror_with_name ("fork"); | |
160 | ||
161 | if (pid == 0) | |
162 | { | |
163 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
164 | ||
254787d4 | 165 | signal (__SIGRTMIN + 1, SIG_DFL); |
0d62e5e8 | 166 | |
a9fa9f7d DJ |
167 | setpgid (0, 0); |
168 | ||
2b876972 DJ |
169 | execv (program, allargs); |
170 | if (errno == ENOENT) | |
171 | execvp (program, allargs); | |
da6d8c04 DJ |
172 | |
173 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 174 | strerror (errno)); |
da6d8c04 DJ |
175 | fflush (stderr); |
176 | _exit (0177); | |
177 | } | |
178 | ||
0d62e5e8 | 179 | new_process = add_process (pid); |
a06660f7 | 180 | add_thread (pid, new_process, pid); |
611cb4a5 | 181 | |
a9fa9f7d | 182 | return pid; |
da6d8c04 DJ |
183 | } |
184 | ||
185 | /* Attach to an inferior process. */ | |
186 | ||
0d62e5e8 | 187 | void |
a1928bad | 188 | linux_attach_lwp (unsigned long pid, unsigned long tid) |
da6d8c04 | 189 | { |
0d62e5e8 | 190 | struct process_info *new_process; |
611cb4a5 | 191 | |
da6d8c04 DJ |
192 | if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0) |
193 | { | |
a1928bad | 194 | fprintf (stderr, "Cannot attach to process %ld: %s (%d)\n", pid, |
43d5792c | 195 | strerror (errno), errno); |
da6d8c04 | 196 | fflush (stderr); |
0d62e5e8 DJ |
197 | |
198 | /* If we fail to attach to an LWP, just return. */ | |
199 | if (!using_threads) | |
200 | _exit (0177); | |
201 | return; | |
da6d8c04 DJ |
202 | } |
203 | ||
0d62e5e8 | 204 | new_process = (struct process_info *) add_process (pid); |
a06660f7 | 205 | add_thread (tid, new_process, pid); |
0d62e5e8 DJ |
206 | |
207 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH | |
208 | brings it to a halt. We should ignore that SIGSTOP and resume the process | |
209 | (unless this is the first process, in which case the flag will be cleared | |
210 | in linux_attach). | |
211 | ||
212 | On the other hand, if we are currently trying to stop all threads, we | |
213 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
214 | because we are guaranteed that add_process added us to the end of the | |
215 | list, and so the new thread has not yet reached wait_for_sigstop (but | |
216 | will). */ | |
217 | if (! stopping_threads) | |
218 | new_process->stop_expected = 1; | |
219 | } | |
220 | ||
221 | int | |
a1928bad | 222 | linux_attach (unsigned long pid) |
0d62e5e8 DJ |
223 | { |
224 | struct process_info *process; | |
225 | ||
226 | linux_attach_lwp (pid, pid); | |
227 | ||
ae13219e DJ |
228 | /* Don't ignore the initial SIGSTOP if we just attached to this process. |
229 | It will be collected by wait shortly. */ | |
0d62e5e8 DJ |
230 | process = (struct process_info *) find_inferior_id (&all_processes, pid); |
231 | process->stop_expected = 0; | |
232 | ||
da6d8c04 DJ |
233 | return 0; |
234 | } | |
235 | ||
236 | /* Kill the inferior process. Make us have no inferior. */ | |
237 | ||
ce3a066d | 238 | static void |
0d62e5e8 | 239 | linux_kill_one_process (struct inferior_list_entry *entry) |
da6d8c04 | 240 | { |
0d62e5e8 DJ |
241 | struct thread_info *thread = (struct thread_info *) entry; |
242 | struct process_info *process = get_thread_process (thread); | |
243 | int wstat; | |
244 | ||
fd500816 DJ |
245 | /* We avoid killing the first thread here, because of a Linux kernel (at |
246 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
247 | the children get a chance to be reaped, it will remain a zombie | |
248 | forever. */ | |
249 | if (entry == all_threads.head) | |
250 | return; | |
251 | ||
0d62e5e8 DJ |
252 | do |
253 | { | |
254 | ptrace (PTRACE_KILL, pid_of (process), 0, 0); | |
255 | ||
256 | /* Make sure it died. The loop is most likely unnecessary. */ | |
257 | wstat = linux_wait_for_event (thread); | |
258 | } while (WIFSTOPPED (wstat)); | |
da6d8c04 DJ |
259 | } |
260 | ||
0d62e5e8 DJ |
261 | static void |
262 | linux_kill (void) | |
263 | { | |
fd500816 | 264 | struct thread_info *thread = (struct thread_info *) all_threads.head; |
9d606399 | 265 | struct process_info *process; |
fd500816 DJ |
266 | int wstat; |
267 | ||
9d606399 DJ |
268 | if (thread == NULL) |
269 | return; | |
270 | ||
0d62e5e8 | 271 | for_each_inferior (&all_threads, linux_kill_one_process); |
fd500816 DJ |
272 | |
273 | /* See the comment in linux_kill_one_process. We did not kill the first | |
274 | thread in the list, so do so now. */ | |
9d606399 | 275 | process = get_thread_process (thread); |
fd500816 DJ |
276 | do |
277 | { | |
278 | ptrace (PTRACE_KILL, pid_of (process), 0, 0); | |
279 | ||
280 | /* Make sure it died. The loop is most likely unnecessary. */ | |
281 | wstat = linux_wait_for_event (thread); | |
282 | } while (WIFSTOPPED (wstat)); | |
0d62e5e8 DJ |
283 | } |
284 | ||
6ad8ae5c DJ |
285 | static void |
286 | linux_detach_one_process (struct inferior_list_entry *entry) | |
287 | { | |
288 | struct thread_info *thread = (struct thread_info *) entry; | |
289 | struct process_info *process = get_thread_process (thread); | |
290 | ||
ae13219e DJ |
291 | /* Make sure the process isn't stopped at a breakpoint that's |
292 | no longer there. */ | |
293 | check_removed_breakpoint (process); | |
294 | ||
295 | /* If this process is stopped but is expecting a SIGSTOP, then make | |
296 | sure we take care of that now. This isn't absolutely guaranteed | |
297 | to collect the SIGSTOP, but is fairly likely to. */ | |
298 | if (process->stop_expected) | |
299 | { | |
300 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ | |
301 | process->stop_expected = 0; | |
302 | if (process->stopped) | |
303 | linux_resume_one_process (&process->head, 0, 0, NULL); | |
304 | linux_wait_for_event (thread); | |
305 | } | |
306 | ||
307 | /* Flush any pending changes to the process's registers. */ | |
308 | regcache_invalidate_one ((struct inferior_list_entry *) | |
309 | get_process_thread (process)); | |
310 | ||
311 | /* Finally, let it resume. */ | |
6ad8ae5c DJ |
312 | ptrace (PTRACE_DETACH, pid_of (process), 0, 0); |
313 | } | |
314 | ||
dd6953e1 | 315 | static int |
6ad8ae5c DJ |
316 | linux_detach (void) |
317 | { | |
ae13219e | 318 | delete_all_breakpoints (); |
6ad8ae5c | 319 | for_each_inferior (&all_threads, linux_detach_one_process); |
ae13219e | 320 | clear_inferiors (); |
dd6953e1 | 321 | return 0; |
6ad8ae5c DJ |
322 | } |
323 | ||
444d6139 PA |
324 | static void |
325 | linux_join (void) | |
326 | { | |
327 | extern unsigned long signal_pid; | |
328 | int status, ret; | |
329 | ||
330 | do { | |
331 | ret = waitpid (signal_pid, &status, 0); | |
332 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
333 | break; | |
334 | } while (ret != -1 || errno != ECHILD); | |
335 | } | |
336 | ||
6ad8ae5c | 337 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 338 | static int |
a1928bad | 339 | linux_thread_alive (unsigned long tid) |
0d62e5e8 DJ |
340 | { |
341 | if (find_inferior_id (&all_threads, tid) != NULL) | |
342 | return 1; | |
343 | else | |
344 | return 0; | |
345 | } | |
346 | ||
347 | /* Return nonzero if this process stopped at a breakpoint which | |
348 | no longer appears to be inserted. Also adjust the PC | |
349 | appropriately to resume where the breakpoint used to be. */ | |
ce3a066d | 350 | static int |
0d62e5e8 | 351 | check_removed_breakpoint (struct process_info *event_child) |
da6d8c04 | 352 | { |
0d62e5e8 DJ |
353 | CORE_ADDR stop_pc; |
354 | struct thread_info *saved_inferior; | |
355 | ||
356 | if (event_child->pending_is_breakpoint == 0) | |
357 | return 0; | |
358 | ||
359 | if (debug_threads) | |
ae13219e DJ |
360 | fprintf (stderr, "Checking for breakpoint in process %ld.\n", |
361 | event_child->lwpid); | |
0d62e5e8 DJ |
362 | |
363 | saved_inferior = current_inferior; | |
364 | current_inferior = get_process_thread (event_child); | |
365 | ||
366 | stop_pc = get_stop_pc (); | |
367 | ||
368 | /* If the PC has changed since we stopped, then we shouldn't do | |
369 | anything. This happens if, for instance, GDB handled the | |
370 | decr_pc_after_break subtraction itself. */ | |
371 | if (stop_pc != event_child->pending_stop_pc) | |
372 | { | |
373 | if (debug_threads) | |
ae13219e DJ |
374 | fprintf (stderr, "Ignoring, PC was changed. Old PC was 0x%08llx\n", |
375 | event_child->pending_stop_pc); | |
0d62e5e8 DJ |
376 | |
377 | event_child->pending_is_breakpoint = 0; | |
378 | current_inferior = saved_inferior; | |
379 | return 0; | |
380 | } | |
381 | ||
382 | /* If the breakpoint is still there, we will report hitting it. */ | |
383 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
384 | { | |
385 | if (debug_threads) | |
386 | fprintf (stderr, "Ignoring, breakpoint is still present.\n"); | |
387 | current_inferior = saved_inferior; | |
388 | return 0; | |
389 | } | |
390 | ||
391 | if (debug_threads) | |
392 | fprintf (stderr, "Removed breakpoint.\n"); | |
393 | ||
394 | /* For decr_pc_after_break targets, here is where we perform the | |
395 | decrement. We go immediately from this function to resuming, | |
396 | and can not safely call get_stop_pc () again. */ | |
397 | if (the_low_target.set_pc != NULL) | |
398 | (*the_low_target.set_pc) (stop_pc); | |
399 | ||
400 | /* We consumed the pending SIGTRAP. */ | |
5544ad89 | 401 | event_child->pending_is_breakpoint = 0; |
0d62e5e8 DJ |
402 | event_child->status_pending_p = 0; |
403 | event_child->status_pending = 0; | |
404 | ||
405 | current_inferior = saved_inferior; | |
da6d8c04 DJ |
406 | return 1; |
407 | } | |
408 | ||
0d62e5e8 DJ |
409 | /* Return 1 if this process has an interesting status pending. This function |
410 | may silently resume an inferior process. */ | |
611cb4a5 | 411 | static int |
0d62e5e8 DJ |
412 | status_pending_p (struct inferior_list_entry *entry, void *dummy) |
413 | { | |
414 | struct process_info *process = (struct process_info *) entry; | |
415 | ||
416 | if (process->status_pending_p) | |
417 | if (check_removed_breakpoint (process)) | |
418 | { | |
419 | /* This thread was stopped at a breakpoint, and the breakpoint | |
420 | is now gone. We were told to continue (or step...) all threads, | |
421 | so GDB isn't trying to single-step past this breakpoint. | |
422 | So instead of reporting the old SIGTRAP, pretend we got to | |
423 | the breakpoint just after it was removed instead of just | |
424 | before; resume the process. */ | |
32ca6d61 | 425 | linux_resume_one_process (&process->head, 0, 0, NULL); |
0d62e5e8 DJ |
426 | return 0; |
427 | } | |
428 | ||
429 | return process->status_pending_p; | |
430 | } | |
431 | ||
432 | static void | |
433 | linux_wait_for_process (struct process_info **childp, int *wstatp) | |
611cb4a5 | 434 | { |
0d62e5e8 DJ |
435 | int ret; |
436 | int to_wait_for = -1; | |
437 | ||
438 | if (*childp != NULL) | |
439 | to_wait_for = (*childp)->lwpid; | |
611cb4a5 DJ |
440 | |
441 | while (1) | |
442 | { | |
0d62e5e8 DJ |
443 | ret = waitpid (to_wait_for, wstatp, WNOHANG); |
444 | ||
445 | if (ret == -1) | |
446 | { | |
447 | if (errno != ECHILD) | |
448 | perror_with_name ("waitpid"); | |
449 | } | |
450 | else if (ret > 0) | |
451 | break; | |
452 | ||
453 | ret = waitpid (to_wait_for, wstatp, WNOHANG | __WCLONE); | |
454 | ||
455 | if (ret == -1) | |
456 | { | |
457 | if (errno != ECHILD) | |
458 | perror_with_name ("waitpid (WCLONE)"); | |
459 | } | |
460 | else if (ret > 0) | |
461 | break; | |
462 | ||
463 | usleep (1000); | |
464 | } | |
465 | ||
466 | if (debug_threads | |
467 | && (!WIFSTOPPED (*wstatp) | |
468 | || (WSTOPSIG (*wstatp) != 32 | |
469 | && WSTOPSIG (*wstatp) != 33))) | |
470 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
471 | ||
472 | if (to_wait_for == -1) | |
473 | *childp = (struct process_info *) find_inferior_id (&all_processes, ret); | |
474 | ||
475 | (*childp)->stopped = 1; | |
476 | (*childp)->pending_is_breakpoint = 0; | |
477 | ||
32ca6d61 DJ |
478 | (*childp)->last_status = *wstatp; |
479 | ||
0d62e5e8 DJ |
480 | if (debug_threads |
481 | && WIFSTOPPED (*wstatp)) | |
482 | { | |
483 | current_inferior = (struct thread_info *) | |
484 | find_inferior_id (&all_threads, (*childp)->tid); | |
485 | /* For testing only; i386_stop_pc prints out a diagnostic. */ | |
486 | if (the_low_target.get_pc != NULL) | |
487 | get_stop_pc (); | |
488 | } | |
489 | } | |
611cb4a5 | 490 | |
0d62e5e8 DJ |
491 | static int |
492 | linux_wait_for_event (struct thread_info *child) | |
493 | { | |
494 | CORE_ADDR stop_pc; | |
495 | struct process_info *event_child; | |
496 | int wstat; | |
497 | ||
498 | /* Check for a process with a pending status. */ | |
499 | /* It is possible that the user changed the pending task's registers since | |
500 | it stopped. We correctly handle the change of PC if we hit a breakpoint | |
e5379b03 | 501 | (in check_removed_breakpoint); signals should be reported anyway. */ |
0d62e5e8 DJ |
502 | if (child == NULL) |
503 | { | |
504 | event_child = (struct process_info *) | |
505 | find_inferior (&all_processes, status_pending_p, NULL); | |
506 | if (debug_threads && event_child) | |
a1928bad | 507 | fprintf (stderr, "Got a pending child %ld\n", event_child->lwpid); |
0d62e5e8 DJ |
508 | } |
509 | else | |
510 | { | |
511 | event_child = get_thread_process (child); | |
512 | if (event_child->status_pending_p | |
513 | && check_removed_breakpoint (event_child)) | |
514 | event_child = NULL; | |
515 | } | |
611cb4a5 | 516 | |
0d62e5e8 DJ |
517 | if (event_child != NULL) |
518 | { | |
519 | if (event_child->status_pending_p) | |
611cb4a5 | 520 | { |
0d62e5e8 | 521 | if (debug_threads) |
a1928bad | 522 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", |
0d62e5e8 DJ |
523 | event_child->lwpid, event_child->status_pending); |
524 | wstat = event_child->status_pending; | |
525 | event_child->status_pending_p = 0; | |
526 | event_child->status_pending = 0; | |
527 | current_inferior = get_process_thread (event_child); | |
528 | return wstat; | |
529 | } | |
530 | } | |
531 | ||
532 | /* We only enter this loop if no process has a pending wait status. Thus | |
533 | any action taken in response to a wait status inside this loop is | |
534 | responding as soon as we detect the status, not after any pending | |
535 | events. */ | |
536 | while (1) | |
537 | { | |
538 | if (child == NULL) | |
539 | event_child = NULL; | |
540 | else | |
541 | event_child = get_thread_process (child); | |
542 | ||
543 | linux_wait_for_process (&event_child, &wstat); | |
544 | ||
545 | if (event_child == NULL) | |
546 | error ("event from unknown child"); | |
611cb4a5 | 547 | |
0d62e5e8 DJ |
548 | current_inferior = (struct thread_info *) |
549 | find_inferior_id (&all_threads, event_child->tid); | |
550 | ||
89be2091 DJ |
551 | /* Check for thread exit. */ |
552 | if (using_threads && ! WIFSTOPPED (wstat)) | |
0d62e5e8 | 553 | { |
89be2091 DJ |
554 | if (debug_threads) |
555 | fprintf (stderr, "Thread %ld (LWP %ld) exiting\n", | |
556 | event_child->tid, event_child->head.id); | |
557 | ||
558 | /* If the last thread is exiting, just return. */ | |
559 | if (all_threads.head == all_threads.tail) | |
560 | return wstat; | |
561 | ||
562 | dead_thread_notify (event_child->tid); | |
563 | ||
564 | remove_inferior (&all_processes, &event_child->head); | |
565 | free (event_child); | |
566 | remove_thread (current_inferior); | |
567 | current_inferior = (struct thread_info *) all_threads.head; | |
568 | ||
569 | /* If we were waiting for this particular child to do something... | |
570 | well, it did something. */ | |
571 | if (child != NULL) | |
572 | return wstat; | |
573 | ||
574 | /* Wait for a more interesting event. */ | |
575 | continue; | |
576 | } | |
577 | ||
578 | if (using_threads | |
579 | && WIFSTOPPED (wstat) | |
580 | && WSTOPSIG (wstat) == SIGSTOP | |
581 | && event_child->stop_expected) | |
582 | { | |
583 | if (debug_threads) | |
584 | fprintf (stderr, "Expected stop.\n"); | |
585 | event_child->stop_expected = 0; | |
586 | linux_resume_one_process (&event_child->head, | |
587 | event_child->stepping, 0, NULL); | |
588 | continue; | |
589 | } | |
590 | ||
591 | /* If GDB is not interested in this signal, don't stop other | |
592 | threads, and don't report it to GDB. Just resume the | |
593 | inferior right away. We do this for threading-related | |
594 | signals as well as any that GDB specifically requested | |
595 | we ignore. But never ignore SIGSTOP if we sent it | |
596 | ourselves. */ | |
597 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
598 | thread library? */ | |
599 | if (WIFSTOPPED (wstat) | |
600 | && ((using_threads && (WSTOPSIG (wstat) == __SIGRTMIN | |
601 | || WSTOPSIG (wstat) == __SIGRTMIN + 1)) | |
602 | || (pass_signals[target_signal_from_host (WSTOPSIG (wstat))] | |
603 | && (WSTOPSIG (wstat) != SIGSTOP | |
604 | || !event_child->sigstop_sent)))) | |
605 | { | |
606 | siginfo_t info, *info_p; | |
607 | ||
608 | if (debug_threads) | |
609 | fprintf (stderr, "Ignored signal %d for %ld (LWP %ld).\n", | |
610 | WSTOPSIG (wstat), event_child->tid, | |
611 | event_child->head.id); | |
612 | ||
613 | if (ptrace (PTRACE_GETSIGINFO, event_child->lwpid, 0, &info) == 0) | |
614 | info_p = &info; | |
615 | else | |
616 | info_p = NULL; | |
617 | linux_resume_one_process (&event_child->head, | |
618 | event_child->stepping, | |
619 | WSTOPSIG (wstat), info_p); | |
620 | continue; | |
0d62e5e8 | 621 | } |
611cb4a5 | 622 | |
0d62e5e8 DJ |
623 | /* If this event was not handled above, and is not a SIGTRAP, report |
624 | it. */ | |
625 | if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGTRAP) | |
626 | return wstat; | |
611cb4a5 | 627 | |
0d62e5e8 DJ |
628 | /* If this target does not support breakpoints, we simply report the |
629 | SIGTRAP; it's of no concern to us. */ | |
630 | if (the_low_target.get_pc == NULL) | |
631 | return wstat; | |
632 | ||
633 | stop_pc = get_stop_pc (); | |
634 | ||
635 | /* bp_reinsert will only be set if we were single-stepping. | |
636 | Notice that we will resume the process after hitting | |
637 | a gdbserver breakpoint; single-stepping to/over one | |
638 | is not supported (yet). */ | |
639 | if (event_child->bp_reinsert != 0) | |
640 | { | |
641 | if (debug_threads) | |
642 | fprintf (stderr, "Reinserted breakpoint.\n"); | |
643 | reinsert_breakpoint (event_child->bp_reinsert); | |
644 | event_child->bp_reinsert = 0; | |
645 | ||
646 | /* Clear the single-stepping flag and SIGTRAP as we resume. */ | |
32ca6d61 | 647 | linux_resume_one_process (&event_child->head, 0, 0, NULL); |
0d62e5e8 DJ |
648 | continue; |
649 | } | |
650 | ||
651 | if (debug_threads) | |
652 | fprintf (stderr, "Hit a (non-reinsert) breakpoint.\n"); | |
653 | ||
654 | if (check_breakpoints (stop_pc) != 0) | |
655 | { | |
656 | /* We hit one of our own breakpoints. We mark it as a pending | |
e5379b03 | 657 | breakpoint, so that check_removed_breakpoint () will do the PC |
0d62e5e8 DJ |
658 | adjustment for us at the appropriate time. */ |
659 | event_child->pending_is_breakpoint = 1; | |
660 | event_child->pending_stop_pc = stop_pc; | |
661 | ||
662 | /* Now we need to put the breakpoint back. We continue in the event | |
663 | loop instead of simply replacing the breakpoint right away, | |
664 | in order to not lose signals sent to the thread that hit the | |
665 | breakpoint. Unfortunately this increases the window where another | |
666 | thread could sneak past the removed breakpoint. For the current | |
667 | use of server-side breakpoints (thread creation) this is | |
668 | acceptable; but it needs to be considered before this breakpoint | |
669 | mechanism can be used in more general ways. For some breakpoints | |
670 | it may be necessary to stop all other threads, but that should | |
671 | be avoided where possible. | |
672 | ||
673 | If breakpoint_reinsert_addr is NULL, that means that we can | |
674 | use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint, | |
675 | mark it for reinsertion, and single-step. | |
676 | ||
677 | Otherwise, call the target function to figure out where we need | |
678 | our temporary breakpoint, create it, and continue executing this | |
679 | process. */ | |
680 | if (the_low_target.breakpoint_reinsert_addr == NULL) | |
681 | { | |
682 | event_child->bp_reinsert = stop_pc; | |
683 | uninsert_breakpoint (stop_pc); | |
32ca6d61 | 684 | linux_resume_one_process (&event_child->head, 1, 0, NULL); |
0d62e5e8 DJ |
685 | } |
686 | else | |
687 | { | |
688 | reinsert_breakpoint_by_bp | |
689 | (stop_pc, (*the_low_target.breakpoint_reinsert_addr) ()); | |
32ca6d61 | 690 | linux_resume_one_process (&event_child->head, 0, 0, NULL); |
611cb4a5 | 691 | } |
0d62e5e8 DJ |
692 | |
693 | continue; | |
694 | } | |
695 | ||
696 | /* If we were single-stepping, we definitely want to report the | |
697 | SIGTRAP. The single-step operation has completed, so also | |
aa691b87 | 698 | clear the stepping flag; in general this does not matter, |
0d62e5e8 DJ |
699 | because the SIGTRAP will be reported to the client, which |
700 | will give us a new action for this thread, but clear it for | |
701 | consistency anyway. It's safe to clear the stepping flag | |
702 | because the only consumer of get_stop_pc () after this point | |
e5379b03 | 703 | is check_removed_breakpoint, and pending_is_breakpoint is not |
0d62e5e8 DJ |
704 | set. It might be wiser to use a step_completed flag instead. */ |
705 | if (event_child->stepping) | |
706 | { | |
707 | event_child->stepping = 0; | |
708 | return wstat; | |
709 | } | |
710 | ||
711 | /* A SIGTRAP that we can't explain. It may have been a breakpoint. | |
712 | Check if it is a breakpoint, and if so mark the process information | |
713 | accordingly. This will handle both the necessary fiddling with the | |
714 | PC on decr_pc_after_break targets and suppressing extra threads | |
715 | hitting a breakpoint if two hit it at once and then GDB removes it | |
716 | after the first is reported. Arguably it would be better to report | |
717 | multiple threads hitting breakpoints simultaneously, but the current | |
718 | remote protocol does not allow this. */ | |
719 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
720 | { | |
721 | event_child->pending_is_breakpoint = 1; | |
722 | event_child->pending_stop_pc = stop_pc; | |
611cb4a5 DJ |
723 | } |
724 | ||
725 | return wstat; | |
726 | } | |
0d62e5e8 | 727 | |
611cb4a5 DJ |
728 | /* NOTREACHED */ |
729 | return 0; | |
730 | } | |
731 | ||
0d62e5e8 | 732 | /* Wait for process, returns status. */ |
da6d8c04 | 733 | |
ce3a066d DJ |
734 | static unsigned char |
735 | linux_wait (char *status) | |
da6d8c04 | 736 | { |
e5f1222d | 737 | int w; |
0d62e5e8 DJ |
738 | struct thread_info *child = NULL; |
739 | ||
740 | retry: | |
741 | /* If we were only supposed to resume one thread, only wait for | |
742 | that thread - if it's still alive. If it died, however - which | |
743 | can happen if we're coming from the thread death case below - | |
744 | then we need to make sure we restart the other threads. We could | |
745 | pick a thread at random or restart all; restarting all is less | |
746 | arbitrary. */ | |
d592fa2f | 747 | if (cont_thread != 0 && cont_thread != -1) |
0d62e5e8 DJ |
748 | { |
749 | child = (struct thread_info *) find_inferior_id (&all_threads, | |
750 | cont_thread); | |
751 | ||
752 | /* No stepping, no signal - unless one is pending already, of course. */ | |
753 | if (child == NULL) | |
64386c31 DJ |
754 | { |
755 | struct thread_resume resume_info; | |
756 | resume_info.thread = -1; | |
757 | resume_info.step = resume_info.sig = resume_info.leave_stopped = 0; | |
758 | linux_resume (&resume_info); | |
759 | } | |
0d62e5e8 | 760 | } |
da6d8c04 DJ |
761 | |
762 | enable_async_io (); | |
62ea82f5 | 763 | unblock_async_io (); |
0d62e5e8 DJ |
764 | w = linux_wait_for_event (child); |
765 | stop_all_processes (); | |
da6d8c04 | 766 | disable_async_io (); |
da6d8c04 | 767 | |
0d62e5e8 DJ |
768 | /* If we are waiting for a particular child, and it exited, |
769 | linux_wait_for_event will return its exit status. Similarly if | |
770 | the last child exited. If this is not the last child, however, | |
771 | do not report it as exited until there is a 'thread exited' response | |
772 | available in the remote protocol. Instead, just wait for another event. | |
773 | This should be safe, because if the thread crashed we will already | |
774 | have reported the termination signal to GDB; that should stop any | |
775 | in-progress stepping operations, etc. | |
776 | ||
777 | Report the exit status of the last thread to exit. This matches | |
778 | LinuxThreads' behavior. */ | |
779 | ||
780 | if (all_threads.head == all_threads.tail) | |
da6d8c04 | 781 | { |
0d62e5e8 DJ |
782 | if (WIFEXITED (w)) |
783 | { | |
784 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
785 | *status = 'W'; | |
786 | clear_inferiors (); | |
075b3282 DJ |
787 | free (all_processes.head); |
788 | all_processes.head = all_processes.tail = NULL; | |
b80864fb | 789 | return WEXITSTATUS (w); |
0d62e5e8 DJ |
790 | } |
791 | else if (!WIFSTOPPED (w)) | |
792 | { | |
793 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
0d62e5e8 | 794 | *status = 'X'; |
075b3282 DJ |
795 | clear_inferiors (); |
796 | free (all_processes.head); | |
797 | all_processes.head = all_processes.tail = NULL; | |
b80864fb | 798 | return target_signal_from_host (WTERMSIG (w)); |
0d62e5e8 | 799 | } |
da6d8c04 | 800 | } |
0d62e5e8 | 801 | else |
da6d8c04 | 802 | { |
0d62e5e8 DJ |
803 | if (!WIFSTOPPED (w)) |
804 | goto retry; | |
da6d8c04 DJ |
805 | } |
806 | ||
da6d8c04 | 807 | *status = 'T'; |
b80864fb | 808 | return target_signal_from_host (WSTOPSIG (w)); |
da6d8c04 DJ |
809 | } |
810 | ||
fd500816 DJ |
811 | /* Send a signal to an LWP. For LinuxThreads, kill is enough; however, if |
812 | thread groups are in use, we need to use tkill. */ | |
813 | ||
814 | static int | |
a1928bad | 815 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 DJ |
816 | { |
817 | static int tkill_failed; | |
818 | ||
819 | errno = 0; | |
820 | ||
821 | #ifdef SYS_tkill | |
822 | if (!tkill_failed) | |
823 | { | |
824 | int ret = syscall (SYS_tkill, lwpid, signo); | |
825 | if (errno != ENOSYS) | |
826 | return ret; | |
827 | errno = 0; | |
828 | tkill_failed = 1; | |
829 | } | |
830 | #endif | |
831 | ||
832 | return kill (lwpid, signo); | |
833 | } | |
834 | ||
0d62e5e8 DJ |
835 | static void |
836 | send_sigstop (struct inferior_list_entry *entry) | |
837 | { | |
838 | struct process_info *process = (struct process_info *) entry; | |
839 | ||
840 | if (process->stopped) | |
841 | return; | |
842 | ||
843 | /* If we already have a pending stop signal for this process, don't | |
844 | send another. */ | |
845 | if (process->stop_expected) | |
846 | { | |
ae13219e DJ |
847 | if (debug_threads) |
848 | fprintf (stderr, "Have pending sigstop for process %ld\n", | |
849 | process->lwpid); | |
850 | ||
851 | /* We clear the stop_expected flag so that wait_for_sigstop | |
852 | will receive the SIGSTOP event (instead of silently resuming and | |
853 | waiting again). It'll be reset below. */ | |
0d62e5e8 DJ |
854 | process->stop_expected = 0; |
855 | return; | |
856 | } | |
857 | ||
858 | if (debug_threads) | |
a1928bad | 859 | fprintf (stderr, "Sending sigstop to process %ld\n", process->head.id); |
0d62e5e8 | 860 | |
fd500816 | 861 | kill_lwp (process->head.id, SIGSTOP); |
0d62e5e8 DJ |
862 | process->sigstop_sent = 1; |
863 | } | |
864 | ||
865 | static void | |
866 | wait_for_sigstop (struct inferior_list_entry *entry) | |
867 | { | |
868 | struct process_info *process = (struct process_info *) entry; | |
869 | struct thread_info *saved_inferior, *thread; | |
a1928bad DJ |
870 | int wstat; |
871 | unsigned long saved_tid; | |
0d62e5e8 DJ |
872 | |
873 | if (process->stopped) | |
874 | return; | |
875 | ||
876 | saved_inferior = current_inferior; | |
877 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
878 | thread = (struct thread_info *) find_inferior_id (&all_threads, | |
879 | process->tid); | |
880 | wstat = linux_wait_for_event (thread); | |
881 | ||
882 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
883 | and record the pending SIGSTOP. If the process exited, just | |
884 | return. */ | |
885 | if (WIFSTOPPED (wstat) | |
886 | && WSTOPSIG (wstat) != SIGSTOP) | |
887 | { | |
888 | if (debug_threads) | |
ae13219e DJ |
889 | fprintf (stderr, "Process %ld (thread %ld) " |
890 | "stopped with non-sigstop status %06x\n", | |
891 | process->lwpid, process->tid, wstat); | |
0d62e5e8 DJ |
892 | process->status_pending_p = 1; |
893 | process->status_pending = wstat; | |
894 | process->stop_expected = 1; | |
895 | } | |
896 | ||
897 | if (linux_thread_alive (saved_tid)) | |
898 | current_inferior = saved_inferior; | |
899 | else | |
900 | { | |
901 | if (debug_threads) | |
902 | fprintf (stderr, "Previously current thread died.\n"); | |
903 | ||
904 | /* Set a valid thread as current. */ | |
905 | set_desired_inferior (0); | |
906 | } | |
907 | } | |
908 | ||
909 | static void | |
910 | stop_all_processes (void) | |
911 | { | |
912 | stopping_threads = 1; | |
913 | for_each_inferior (&all_processes, send_sigstop); | |
914 | for_each_inferior (&all_processes, wait_for_sigstop); | |
915 | stopping_threads = 0; | |
916 | } | |
917 | ||
da6d8c04 DJ |
918 | /* Resume execution of the inferior process. |
919 | If STEP is nonzero, single-step it. | |
920 | If SIGNAL is nonzero, give it that signal. */ | |
921 | ||
ce3a066d | 922 | static void |
0d62e5e8 | 923 | linux_resume_one_process (struct inferior_list_entry *entry, |
32ca6d61 | 924 | int step, int signal, siginfo_t *info) |
da6d8c04 | 925 | { |
0d62e5e8 DJ |
926 | struct process_info *process = (struct process_info *) entry; |
927 | struct thread_info *saved_inferior; | |
928 | ||
929 | if (process->stopped == 0) | |
930 | return; | |
931 | ||
932 | /* If we have pending signals or status, and a new signal, enqueue the | |
933 | signal. Also enqueue the signal if we are waiting to reinsert a | |
934 | breakpoint; it will be picked up again below. */ | |
935 | if (signal != 0 | |
936 | && (process->status_pending_p || process->pending_signals != NULL | |
937 | || process->bp_reinsert != 0)) | |
938 | { | |
939 | struct pending_signals *p_sig; | |
940 | p_sig = malloc (sizeof (*p_sig)); | |
941 | p_sig->prev = process->pending_signals; | |
942 | p_sig->signal = signal; | |
32ca6d61 DJ |
943 | if (info == NULL) |
944 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
945 | else | |
946 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
0d62e5e8 DJ |
947 | process->pending_signals = p_sig; |
948 | } | |
949 | ||
e5379b03 | 950 | if (process->status_pending_p && !check_removed_breakpoint (process)) |
0d62e5e8 DJ |
951 | return; |
952 | ||
953 | saved_inferior = current_inferior; | |
954 | current_inferior = get_process_thread (process); | |
955 | ||
956 | if (debug_threads) | |
a1928bad | 957 | fprintf (stderr, "Resuming process %ld (%s, signal %d, stop %s)\n", inferior_pid, |
0d62e5e8 DJ |
958 | step ? "step" : "continue", signal, |
959 | process->stop_expected ? "expected" : "not expected"); | |
960 | ||
961 | /* This bit needs some thinking about. If we get a signal that | |
962 | we must report while a single-step reinsert is still pending, | |
963 | we often end up resuming the thread. It might be better to | |
964 | (ew) allow a stack of pending events; then we could be sure that | |
965 | the reinsert happened right away and not lose any signals. | |
966 | ||
967 | Making this stack would also shrink the window in which breakpoints are | |
968 | uninserted (see comment in linux_wait_for_process) but not enough for | |
969 | complete correctness, so it won't solve that problem. It may be | |
970 | worthwhile just to solve this one, however. */ | |
971 | if (process->bp_reinsert != 0) | |
972 | { | |
973 | if (debug_threads) | |
974 | fprintf (stderr, " pending reinsert at %08lx", (long)process->bp_reinsert); | |
975 | if (step == 0) | |
976 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
977 | step = 1; | |
978 | ||
979 | /* Postpone any pending signal. It was enqueued above. */ | |
980 | signal = 0; | |
981 | } | |
982 | ||
983 | check_removed_breakpoint (process); | |
984 | ||
aa691b87 | 985 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 DJ |
986 | { |
987 | fprintf (stderr, " "); | |
52fb6437 | 988 | (*the_low_target.get_pc) (); |
0d62e5e8 DJ |
989 | } |
990 | ||
991 | /* If we have pending signals, consume one unless we are trying to reinsert | |
992 | a breakpoint. */ | |
993 | if (process->pending_signals != NULL && process->bp_reinsert == 0) | |
994 | { | |
995 | struct pending_signals **p_sig; | |
996 | ||
997 | p_sig = &process->pending_signals; | |
998 | while ((*p_sig)->prev != NULL) | |
999 | p_sig = &(*p_sig)->prev; | |
1000 | ||
1001 | signal = (*p_sig)->signal; | |
32ca6d61 DJ |
1002 | if ((*p_sig)->info.si_signo != 0) |
1003 | ptrace (PTRACE_SETSIGINFO, process->lwpid, 0, &(*p_sig)->info); | |
1004 | ||
0d62e5e8 DJ |
1005 | free (*p_sig); |
1006 | *p_sig = NULL; | |
1007 | } | |
1008 | ||
1009 | regcache_invalidate_one ((struct inferior_list_entry *) | |
1010 | get_process_thread (process)); | |
da6d8c04 | 1011 | errno = 0; |
0d62e5e8 DJ |
1012 | process->stopped = 0; |
1013 | process->stepping = step; | |
1014 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, process->lwpid, 0, signal); | |
1015 | ||
1016 | current_inferior = saved_inferior; | |
da6d8c04 DJ |
1017 | if (errno) |
1018 | perror_with_name ("ptrace"); | |
1019 | } | |
1020 | ||
64386c31 DJ |
1021 | static struct thread_resume *resume_ptr; |
1022 | ||
1023 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
1024 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
1025 | resume request. | |
1026 | ||
1027 | This algorithm is O(threads * resume elements), but resume elements | |
1028 | is small (and will remain small at least until GDB supports thread | |
1029 | suspension). */ | |
0d62e5e8 | 1030 | static void |
5544ad89 | 1031 | linux_set_resume_request (struct inferior_list_entry *entry) |
0d62e5e8 DJ |
1032 | { |
1033 | struct process_info *process; | |
64386c31 | 1034 | struct thread_info *thread; |
5544ad89 | 1035 | int ndx; |
64386c31 DJ |
1036 | |
1037 | thread = (struct thread_info *) entry; | |
1038 | process = get_thread_process (thread); | |
1039 | ||
1040 | ndx = 0; | |
1041 | while (resume_ptr[ndx].thread != -1 && resume_ptr[ndx].thread != entry->id) | |
1042 | ndx++; | |
1043 | ||
5544ad89 DJ |
1044 | process->resume = &resume_ptr[ndx]; |
1045 | } | |
1046 | ||
1047 | /* This function is called once per thread. We check the thread's resume | |
1048 | request, which will tell us whether to resume, step, or leave the thread | |
1049 | stopped; and what signal, if any, it should be sent. For threads which | |
1050 | we aren't explicitly told otherwise, we preserve the stepping flag; this | |
1051 | is used for stepping over gdbserver-placed breakpoints. */ | |
1052 | ||
1053 | static void | |
1054 | linux_continue_one_thread (struct inferior_list_entry *entry) | |
1055 | { | |
1056 | struct process_info *process; | |
1057 | struct thread_info *thread; | |
1058 | int step; | |
1059 | ||
1060 | thread = (struct thread_info *) entry; | |
1061 | process = get_thread_process (thread); | |
1062 | ||
1063 | if (process->resume->leave_stopped) | |
64386c31 DJ |
1064 | return; |
1065 | ||
5544ad89 DJ |
1066 | if (process->resume->thread == -1) |
1067 | step = process->stepping || process->resume->step; | |
64386c31 | 1068 | else |
5544ad89 DJ |
1069 | step = process->resume->step; |
1070 | ||
32ca6d61 | 1071 | linux_resume_one_process (&process->head, step, process->resume->sig, NULL); |
c6ecbae5 | 1072 | |
5544ad89 DJ |
1073 | process->resume = NULL; |
1074 | } | |
1075 | ||
1076 | /* This function is called once per thread. We check the thread's resume | |
1077 | request, which will tell us whether to resume, step, or leave the thread | |
1078 | stopped; and what signal, if any, it should be sent. We queue any needed | |
1079 | signals, since we won't actually resume. We already have a pending event | |
1080 | to report, so we don't need to preserve any step requests; they should | |
1081 | be re-issued if necessary. */ | |
1082 | ||
1083 | static void | |
1084 | linux_queue_one_thread (struct inferior_list_entry *entry) | |
1085 | { | |
1086 | struct process_info *process; | |
1087 | struct thread_info *thread; | |
1088 | ||
1089 | thread = (struct thread_info *) entry; | |
1090 | process = get_thread_process (thread); | |
1091 | ||
1092 | if (process->resume->leave_stopped) | |
1093 | return; | |
1094 | ||
1095 | /* If we have a new signal, enqueue the signal. */ | |
1096 | if (process->resume->sig != 0) | |
1097 | { | |
1098 | struct pending_signals *p_sig; | |
1099 | p_sig = malloc (sizeof (*p_sig)); | |
1100 | p_sig->prev = process->pending_signals; | |
1101 | p_sig->signal = process->resume->sig; | |
32ca6d61 DJ |
1102 | memset (&p_sig->info, 0, sizeof (siginfo_t)); |
1103 | ||
1104 | /* If this is the same signal we were previously stopped by, | |
1105 | make sure to queue its siginfo. We can ignore the return | |
1106 | value of ptrace; if it fails, we'll skip | |
1107 | PTRACE_SETSIGINFO. */ | |
1108 | if (WIFSTOPPED (process->last_status) | |
1109 | && WSTOPSIG (process->last_status) == process->resume->sig) | |
1110 | ptrace (PTRACE_GETSIGINFO, process->lwpid, 0, &p_sig->info); | |
1111 | ||
5544ad89 DJ |
1112 | process->pending_signals = p_sig; |
1113 | } | |
1114 | ||
1115 | process->resume = NULL; | |
1116 | } | |
1117 | ||
1118 | /* Set DUMMY if this process has an interesting status pending. */ | |
1119 | static int | |
1120 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
1121 | { | |
1122 | struct process_info *process = (struct process_info *) entry; | |
1123 | ||
1124 | /* Processes which will not be resumed are not interesting, because | |
1125 | we might not wait for them next time through linux_wait. */ | |
1126 | if (process->resume->leave_stopped) | |
1127 | return 0; | |
1128 | ||
1129 | /* If this thread has a removed breakpoint, we won't have any | |
1130 | events to report later, so check now. check_removed_breakpoint | |
1131 | may clear status_pending_p. We avoid calling check_removed_breakpoint | |
1132 | for any thread that we are not otherwise going to resume - this | |
1133 | lets us preserve stopped status when two threads hit a breakpoint. | |
1134 | GDB removes the breakpoint to single-step a particular thread | |
1135 | past it, then re-inserts it and resumes all threads. We want | |
1136 | to report the second thread without resuming it in the interim. */ | |
1137 | if (process->status_pending_p) | |
1138 | check_removed_breakpoint (process); | |
1139 | ||
1140 | if (process->status_pending_p) | |
1141 | * (int *) flag_p = 1; | |
1142 | ||
1143 | return 0; | |
0d62e5e8 DJ |
1144 | } |
1145 | ||
1146 | static void | |
64386c31 | 1147 | linux_resume (struct thread_resume *resume_info) |
0d62e5e8 | 1148 | { |
5544ad89 | 1149 | int pending_flag; |
c6ecbae5 | 1150 | |
5544ad89 | 1151 | /* Yes, the use of a global here is rather ugly. */ |
64386c31 | 1152 | resume_ptr = resume_info; |
5544ad89 DJ |
1153 | |
1154 | for_each_inferior (&all_threads, linux_set_resume_request); | |
1155 | ||
1156 | /* If there is a thread which would otherwise be resumed, which | |
1157 | has a pending status, then don't resume any threads - we can just | |
1158 | report the pending status. Make sure to queue any signals | |
1159 | that would otherwise be sent. */ | |
1160 | pending_flag = 0; | |
1161 | find_inferior (&all_processes, resume_status_pending_p, &pending_flag); | |
1162 | ||
1163 | if (debug_threads) | |
1164 | { | |
1165 | if (pending_flag) | |
1166 | fprintf (stderr, "Not resuming, pending status\n"); | |
1167 | else | |
1168 | fprintf (stderr, "Resuming, no pending status\n"); | |
1169 | } | |
1170 | ||
1171 | if (pending_flag) | |
1172 | for_each_inferior (&all_threads, linux_queue_one_thread); | |
1173 | else | |
62ea82f5 DJ |
1174 | { |
1175 | block_async_io (); | |
1176 | enable_async_io (); | |
1177 | for_each_inferior (&all_threads, linux_continue_one_thread); | |
1178 | } | |
0d62e5e8 DJ |
1179 | } |
1180 | ||
1181 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
1182 | |
1183 | int | |
0a30fbc4 | 1184 | register_addr (int regnum) |
da6d8c04 DJ |
1185 | { |
1186 | int addr; | |
1187 | ||
2ec06d2e | 1188 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
1189 | error ("Invalid register number %d.", regnum); |
1190 | ||
2ec06d2e | 1191 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
1192 | |
1193 | return addr; | |
1194 | } | |
1195 | ||
58caa3dc | 1196 | /* Fetch one register. */ |
da6d8c04 DJ |
1197 | static void |
1198 | fetch_register (int regno) | |
1199 | { | |
1200 | CORE_ADDR regaddr; | |
48d93c75 | 1201 | int i, size; |
0d62e5e8 | 1202 | char *buf; |
da6d8c04 | 1203 | |
2ec06d2e | 1204 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 1205 | return; |
2ec06d2e | 1206 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 1207 | return; |
da6d8c04 | 1208 | |
0a30fbc4 DJ |
1209 | regaddr = register_addr (regno); |
1210 | if (regaddr == -1) | |
1211 | return; | |
48d93c75 UW |
1212 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
1213 | & - sizeof (PTRACE_XFER_TYPE); | |
1214 | buf = alloca (size); | |
1215 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
1216 | { |
1217 | errno = 0; | |
0d62e5e8 | 1218 | *(PTRACE_XFER_TYPE *) (buf + i) = |
da6d8c04 DJ |
1219 | ptrace (PTRACE_PEEKUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, 0); |
1220 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
1221 | if (errno != 0) | |
1222 | { | |
1223 | /* Warning, not error, in case we are attached; sometimes the | |
1224 | kernel doesn't let us at the registers. */ | |
1225 | char *err = strerror (errno); | |
1226 | char *msg = alloca (strlen (err) + 128); | |
1227 | sprintf (msg, "reading register %d: %s", regno, err); | |
1228 | error (msg); | |
1229 | goto error_exit; | |
1230 | } | |
1231 | } | |
5a1f5858 DJ |
1232 | if (the_low_target.left_pad_xfer |
1233 | && register_size (regno) < sizeof (PTRACE_XFER_TYPE)) | |
1234 | supply_register (regno, (buf + sizeof (PTRACE_XFER_TYPE) | |
1235 | - register_size (regno))); | |
1236 | else | |
1237 | supply_register (regno, buf); | |
0d62e5e8 | 1238 | |
da6d8c04 DJ |
1239 | error_exit:; |
1240 | } | |
1241 | ||
1242 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc DJ |
1243 | static void |
1244 | usr_fetch_inferior_registers (int regno) | |
da6d8c04 DJ |
1245 | { |
1246 | if (regno == -1 || regno == 0) | |
2ec06d2e | 1247 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
da6d8c04 DJ |
1248 | fetch_register (regno); |
1249 | else | |
1250 | fetch_register (regno); | |
1251 | } | |
1252 | ||
1253 | /* Store our register values back into the inferior. | |
1254 | If REGNO is -1, do this for all registers. | |
1255 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc DJ |
1256 | static void |
1257 | usr_store_inferior_registers (int regno) | |
da6d8c04 DJ |
1258 | { |
1259 | CORE_ADDR regaddr; | |
48d93c75 | 1260 | int i, size; |
0d62e5e8 | 1261 | char *buf; |
da6d8c04 DJ |
1262 | |
1263 | if (regno >= 0) | |
1264 | { | |
2ec06d2e | 1265 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
1266 | return; |
1267 | ||
bc1e36ca | 1268 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
1269 | return; |
1270 | ||
1271 | regaddr = register_addr (regno); | |
1272 | if (regaddr == -1) | |
da6d8c04 | 1273 | return; |
da6d8c04 | 1274 | errno = 0; |
48d93c75 UW |
1275 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
1276 | & - sizeof (PTRACE_XFER_TYPE); | |
1277 | buf = alloca (size); | |
1278 | memset (buf, 0, size); | |
5a1f5858 DJ |
1279 | if (the_low_target.left_pad_xfer |
1280 | && register_size (regno) < sizeof (PTRACE_XFER_TYPE)) | |
1281 | collect_register (regno, (buf + sizeof (PTRACE_XFER_TYPE) | |
1282 | - register_size (regno))); | |
1283 | else | |
1284 | collect_register (regno, buf); | |
48d93c75 | 1285 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 1286 | { |
0a30fbc4 DJ |
1287 | errno = 0; |
1288 | ptrace (PTRACE_POKEUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, | |
2ff29de4 | 1289 | *(PTRACE_XFER_TYPE *) (buf + i)); |
da6d8c04 DJ |
1290 | if (errno != 0) |
1291 | { | |
bc1e36ca DJ |
1292 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
1293 | { | |
1294 | char *err = strerror (errno); | |
1295 | char *msg = alloca (strlen (err) + 128); | |
1296 | sprintf (msg, "writing register %d: %s", | |
1297 | regno, err); | |
1298 | error (msg); | |
1299 | return; | |
1300 | } | |
da6d8c04 | 1301 | } |
2ff29de4 | 1302 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 1303 | } |
da6d8c04 DJ |
1304 | } |
1305 | else | |
2ec06d2e | 1306 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
0d62e5e8 | 1307 | usr_store_inferior_registers (regno); |
da6d8c04 | 1308 | } |
58caa3dc DJ |
1309 | #endif /* HAVE_LINUX_USRREGS */ |
1310 | ||
1311 | ||
1312 | ||
1313 | #ifdef HAVE_LINUX_REGSETS | |
1314 | ||
1315 | static int | |
0d62e5e8 | 1316 | regsets_fetch_inferior_registers () |
58caa3dc DJ |
1317 | { |
1318 | struct regset_info *regset; | |
e9d25b98 | 1319 | int saw_general_regs = 0; |
58caa3dc DJ |
1320 | |
1321 | regset = target_regsets; | |
1322 | ||
1323 | while (regset->size >= 0) | |
1324 | { | |
1325 | void *buf; | |
1326 | int res; | |
1327 | ||
1328 | if (regset->size == 0) | |
1329 | { | |
1330 | regset ++; | |
1331 | continue; | |
1332 | } | |
1333 | ||
1334 | buf = malloc (regset->size); | |
d06f167a | 1335 | res = ptrace (regset->get_request, inferior_pid, 0, buf); |
58caa3dc DJ |
1336 | if (res < 0) |
1337 | { | |
1338 | if (errno == EIO) | |
1339 | { | |
1340 | /* If we get EIO on the first regset, do not try regsets again. | |
1341 | If we get EIO on a later regset, disable that regset. */ | |
1342 | if (regset == target_regsets) | |
1343 | { | |
1344 | use_regsets_p = 0; | |
1345 | return -1; | |
1346 | } | |
1347 | else | |
1348 | { | |
1349 | regset->size = 0; | |
1350 | continue; | |
1351 | } | |
1352 | } | |
1353 | else | |
1354 | { | |
0d62e5e8 | 1355 | char s[256]; |
a1928bad | 1356 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%ld", |
0d62e5e8 DJ |
1357 | inferior_pid); |
1358 | perror (s); | |
58caa3dc DJ |
1359 | } |
1360 | } | |
e9d25b98 DJ |
1361 | else if (regset->type == GENERAL_REGS) |
1362 | saw_general_regs = 1; | |
58caa3dc DJ |
1363 | regset->store_function (buf); |
1364 | regset ++; | |
1365 | } | |
e9d25b98 DJ |
1366 | if (saw_general_regs) |
1367 | return 0; | |
1368 | else | |
1369 | return 1; | |
58caa3dc DJ |
1370 | } |
1371 | ||
1372 | static int | |
0d62e5e8 | 1373 | regsets_store_inferior_registers () |
58caa3dc DJ |
1374 | { |
1375 | struct regset_info *regset; | |
e9d25b98 | 1376 | int saw_general_regs = 0; |
58caa3dc DJ |
1377 | |
1378 | regset = target_regsets; | |
1379 | ||
1380 | while (regset->size >= 0) | |
1381 | { | |
1382 | void *buf; | |
1383 | int res; | |
1384 | ||
1385 | if (regset->size == 0) | |
1386 | { | |
1387 | regset ++; | |
1388 | continue; | |
1389 | } | |
1390 | ||
1391 | buf = malloc (regset->size); | |
545587ee DJ |
1392 | |
1393 | /* First fill the buffer with the current register set contents, | |
1394 | in case there are any items in the kernel's regset that are | |
1395 | not in gdbserver's regcache. */ | |
1396 | res = ptrace (regset->get_request, inferior_pid, 0, buf); | |
1397 | ||
1398 | if (res == 0) | |
1399 | { | |
1400 | /* Then overlay our cached registers on that. */ | |
1401 | regset->fill_function (buf); | |
1402 | ||
1403 | /* Only now do we write the register set. */ | |
1404 | res = ptrace (regset->set_request, inferior_pid, 0, buf); | |
1405 | } | |
1406 | ||
58caa3dc DJ |
1407 | if (res < 0) |
1408 | { | |
1409 | if (errno == EIO) | |
1410 | { | |
1411 | /* If we get EIO on the first regset, do not try regsets again. | |
1412 | If we get EIO on a later regset, disable that regset. */ | |
1413 | if (regset == target_regsets) | |
1414 | { | |
1415 | use_regsets_p = 0; | |
1416 | return -1; | |
1417 | } | |
1418 | else | |
1419 | { | |
1420 | regset->size = 0; | |
1421 | continue; | |
1422 | } | |
1423 | } | |
1424 | else | |
1425 | { | |
ce3a066d | 1426 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
1427 | } |
1428 | } | |
e9d25b98 DJ |
1429 | else if (regset->type == GENERAL_REGS) |
1430 | saw_general_regs = 1; | |
58caa3dc | 1431 | regset ++; |
09ec9b38 | 1432 | free (buf); |
58caa3dc | 1433 | } |
e9d25b98 DJ |
1434 | if (saw_general_regs) |
1435 | return 0; | |
1436 | else | |
1437 | return 1; | |
ce3a066d | 1438 | return 0; |
58caa3dc DJ |
1439 | } |
1440 | ||
1441 | #endif /* HAVE_LINUX_REGSETS */ | |
1442 | ||
1443 | ||
1444 | void | |
ce3a066d | 1445 | linux_fetch_registers (int regno) |
58caa3dc DJ |
1446 | { |
1447 | #ifdef HAVE_LINUX_REGSETS | |
1448 | if (use_regsets_p) | |
1449 | { | |
1450 | if (regsets_fetch_inferior_registers () == 0) | |
1451 | return; | |
1452 | } | |
1453 | #endif | |
1454 | #ifdef HAVE_LINUX_USRREGS | |
1455 | usr_fetch_inferior_registers (regno); | |
1456 | #endif | |
1457 | } | |
1458 | ||
1459 | void | |
ce3a066d | 1460 | linux_store_registers (int regno) |
58caa3dc DJ |
1461 | { |
1462 | #ifdef HAVE_LINUX_REGSETS | |
1463 | if (use_regsets_p) | |
1464 | { | |
1465 | if (regsets_store_inferior_registers () == 0) | |
1466 | return; | |
1467 | } | |
1468 | #endif | |
1469 | #ifdef HAVE_LINUX_USRREGS | |
1470 | usr_store_inferior_registers (regno); | |
1471 | #endif | |
1472 | } | |
1473 | ||
da6d8c04 | 1474 | |
da6d8c04 DJ |
1475 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
1476 | to debugger memory starting at MYADDR. */ | |
1477 | ||
c3e735a6 | 1478 | static int |
f450004a | 1479 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
1480 | { |
1481 | register int i; | |
1482 | /* Round starting address down to longword boundary. */ | |
1483 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
1484 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
1485 | register int count |
1486 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
1487 | / sizeof (PTRACE_XFER_TYPE); |
1488 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 1489 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 DJ |
1490 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
1491 | ||
1492 | /* Read all the longwords */ | |
1493 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
1494 | { | |
c3e735a6 | 1495 | errno = 0; |
d844cde6 | 1496 | buffer[i] = ptrace (PTRACE_PEEKTEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr, 0); |
c3e735a6 DJ |
1497 | if (errno) |
1498 | return errno; | |
da6d8c04 DJ |
1499 | } |
1500 | ||
1501 | /* Copy appropriate bytes out of the buffer. */ | |
1502 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), len); | |
c3e735a6 DJ |
1503 | |
1504 | return 0; | |
da6d8c04 DJ |
1505 | } |
1506 | ||
1507 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
1508 | to inferior's memory at MEMADDR. | |
1509 | On failure (cannot write the inferior) | |
1510 | returns the value of errno. */ | |
1511 | ||
ce3a066d | 1512 | static int |
f450004a | 1513 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
1514 | { |
1515 | register int i; | |
1516 | /* Round starting address down to longword boundary. */ | |
1517 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
1518 | /* Round ending address up; get number of longwords that makes. */ | |
1519 | register int count | |
1520 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); | |
1521 | /* Allocate buffer of that many longwords. */ | |
1522 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
1523 | extern int errno; | |
1524 | ||
0d62e5e8 DJ |
1525 | if (debug_threads) |
1526 | { | |
1527 | fprintf (stderr, "Writing %02x to %08lx\n", (unsigned)myaddr[0], (long)memaddr); | |
1528 | } | |
1529 | ||
da6d8c04 DJ |
1530 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
1531 | ||
d844cde6 DJ |
1532 | buffer[0] = ptrace (PTRACE_PEEKTEXT, inferior_pid, |
1533 | (PTRACE_ARG3_TYPE) addr, 0); | |
da6d8c04 DJ |
1534 | |
1535 | if (count > 1) | |
1536 | { | |
1537 | buffer[count - 1] | |
1538 | = ptrace (PTRACE_PEEKTEXT, inferior_pid, | |
d844cde6 DJ |
1539 | (PTRACE_ARG3_TYPE) (addr + (count - 1) |
1540 | * sizeof (PTRACE_XFER_TYPE)), | |
1541 | 0); | |
da6d8c04 DJ |
1542 | } |
1543 | ||
1544 | /* Copy data to be written over corresponding part of buffer */ | |
1545 | ||
1546 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); | |
1547 | ||
1548 | /* Write the entire buffer. */ | |
1549 | ||
1550 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
1551 | { | |
1552 | errno = 0; | |
d844cde6 | 1553 | ptrace (PTRACE_POKETEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr, buffer[i]); |
da6d8c04 DJ |
1554 | if (errno) |
1555 | return errno; | |
1556 | } | |
1557 | ||
1558 | return 0; | |
1559 | } | |
2f2893d9 DJ |
1560 | |
1561 | static void | |
1562 | linux_look_up_symbols (void) | |
1563 | { | |
0d62e5e8 DJ |
1564 | #ifdef USE_THREAD_DB |
1565 | if (using_threads) | |
1566 | return; | |
1567 | ||
1568 | using_threads = thread_db_init (); | |
1569 | #endif | |
1570 | } | |
1571 | ||
e5379b03 | 1572 | static void |
ef57601b | 1573 | linux_request_interrupt (void) |
e5379b03 | 1574 | { |
a1928bad | 1575 | extern unsigned long signal_pid; |
e5379b03 | 1576 | |
d592fa2f | 1577 | if (cont_thread != 0 && cont_thread != -1) |
e5379b03 DJ |
1578 | { |
1579 | struct process_info *process; | |
1580 | ||
1581 | process = get_thread_process (current_inferior); | |
ef57601b | 1582 | kill_lwp (process->lwpid, SIGINT); |
e5379b03 DJ |
1583 | } |
1584 | else | |
ef57601b | 1585 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
1586 | } |
1587 | ||
aa691b87 RM |
1588 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
1589 | to debugger memory starting at MYADDR. */ | |
1590 | ||
1591 | static int | |
f450004a | 1592 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
1593 | { |
1594 | char filename[PATH_MAX]; | |
1595 | int fd, n; | |
1596 | ||
a1928bad | 1597 | snprintf (filename, sizeof filename, "/proc/%ld/auxv", inferior_pid); |
aa691b87 RM |
1598 | |
1599 | fd = open (filename, O_RDONLY); | |
1600 | if (fd < 0) | |
1601 | return -1; | |
1602 | ||
1603 | if (offset != (CORE_ADDR) 0 | |
1604 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
1605 | n = -1; | |
1606 | else | |
1607 | n = read (fd, myaddr, len); | |
1608 | ||
1609 | close (fd); | |
1610 | ||
1611 | return n; | |
1612 | } | |
1613 | ||
e013ee27 OF |
1614 | /* These watchpoint related wrapper functions simply pass on the function call |
1615 | if the target has registered a corresponding function. */ | |
1616 | ||
1617 | static int | |
1618 | linux_insert_watchpoint (char type, CORE_ADDR addr, int len) | |
1619 | { | |
1620 | if (the_low_target.insert_watchpoint != NULL) | |
1621 | return the_low_target.insert_watchpoint (type, addr, len); | |
1622 | else | |
1623 | /* Unsupported (see target.h). */ | |
1624 | return 1; | |
1625 | } | |
1626 | ||
1627 | static int | |
1628 | linux_remove_watchpoint (char type, CORE_ADDR addr, int len) | |
1629 | { | |
1630 | if (the_low_target.remove_watchpoint != NULL) | |
1631 | return the_low_target.remove_watchpoint (type, addr, len); | |
1632 | else | |
1633 | /* Unsupported (see target.h). */ | |
1634 | return 1; | |
1635 | } | |
1636 | ||
1637 | static int | |
1638 | linux_stopped_by_watchpoint (void) | |
1639 | { | |
1640 | if (the_low_target.stopped_by_watchpoint != NULL) | |
1641 | return the_low_target.stopped_by_watchpoint (); | |
1642 | else | |
1643 | return 0; | |
1644 | } | |
1645 | ||
1646 | static CORE_ADDR | |
1647 | linux_stopped_data_address (void) | |
1648 | { | |
1649 | if (the_low_target.stopped_data_address != NULL) | |
1650 | return the_low_target.stopped_data_address (); | |
1651 | else | |
1652 | return 0; | |
1653 | } | |
1654 | ||
42c81e2a | 1655 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
1656 | #if defined(__mcoldfire__) |
1657 | /* These should really be defined in the kernel's ptrace.h header. */ | |
1658 | #define PT_TEXT_ADDR 49*4 | |
1659 | #define PT_DATA_ADDR 50*4 | |
1660 | #define PT_TEXT_END_ADDR 51*4 | |
1661 | #endif | |
1662 | ||
1663 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
1664 | to tell gdb about. */ | |
1665 | ||
1666 | static int | |
1667 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
1668 | { | |
1669 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
1670 | unsigned long text, text_end, data; | |
1671 | int pid = get_thread_process (current_inferior)->head.id; | |
1672 | ||
1673 | errno = 0; | |
1674 | ||
1675 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
1676 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
1677 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
1678 | ||
1679 | if (errno == 0) | |
1680 | { | |
1681 | /* Both text and data offsets produced at compile-time (and so | |
1682 | used by gdb) are relative to the beginning of the program, | |
1683 | with the data segment immediately following the text segment. | |
1684 | However, the actual runtime layout in memory may put the data | |
1685 | somewhere else, so when we send gdb a data base-address, we | |
1686 | use the real data base address and subtract the compile-time | |
1687 | data base-address from it (which is just the length of the | |
1688 | text segment). BSS immediately follows data in both | |
1689 | cases. */ | |
1690 | *text_p = text; | |
1691 | *data_p = data - (text_end - text); | |
1692 | ||
1693 | return 1; | |
1694 | } | |
1695 | #endif | |
1696 | return 0; | |
1697 | } | |
1698 | #endif | |
1699 | ||
23181151 DJ |
1700 | static const char * |
1701 | linux_arch_string (void) | |
1702 | { | |
1703 | return the_low_target.arch_string; | |
1704 | } | |
1705 | ||
ce3a066d DJ |
1706 | static struct target_ops linux_target_ops = { |
1707 | linux_create_inferior, | |
1708 | linux_attach, | |
1709 | linux_kill, | |
6ad8ae5c | 1710 | linux_detach, |
444d6139 | 1711 | linux_join, |
ce3a066d DJ |
1712 | linux_thread_alive, |
1713 | linux_resume, | |
1714 | linux_wait, | |
1715 | linux_fetch_registers, | |
1716 | linux_store_registers, | |
1717 | linux_read_memory, | |
1718 | linux_write_memory, | |
2f2893d9 | 1719 | linux_look_up_symbols, |
ef57601b | 1720 | linux_request_interrupt, |
aa691b87 | 1721 | linux_read_auxv, |
e013ee27 OF |
1722 | linux_insert_watchpoint, |
1723 | linux_remove_watchpoint, | |
1724 | linux_stopped_by_watchpoint, | |
1725 | linux_stopped_data_address, | |
42c81e2a | 1726 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 1727 | linux_read_offsets, |
dae5f5cf DJ |
1728 | #else |
1729 | NULL, | |
1730 | #endif | |
1731 | #ifdef USE_THREAD_DB | |
1732 | thread_db_get_tls_address, | |
1733 | #else | |
1734 | NULL, | |
52fb6437 | 1735 | #endif |
23181151 | 1736 | linux_arch_string, |
ce3a066d DJ |
1737 | }; |
1738 | ||
0d62e5e8 DJ |
1739 | static void |
1740 | linux_init_signals () | |
1741 | { | |
1742 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
1743 | to find what the cancel signal actually is. */ | |
254787d4 | 1744 | signal (__SIGRTMIN+1, SIG_IGN); |
0d62e5e8 DJ |
1745 | } |
1746 | ||
da6d8c04 DJ |
1747 | void |
1748 | initialize_low (void) | |
1749 | { | |
0d62e5e8 | 1750 | using_threads = 0; |
ce3a066d | 1751 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
1752 | set_breakpoint_data (the_low_target.breakpoint, |
1753 | the_low_target.breakpoint_len); | |
0a30fbc4 | 1754 | init_registers (); |
0d62e5e8 | 1755 | linux_init_signals (); |
da6d8c04 | 1756 | } |