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