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