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