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