1 /*
2 * Server-side ptrace support
3 *
4 * Copyright (C) 1999 Alexandre Julliard
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19 */
20
21 #include "config.h"
22 #include "wine/port.h"
23
24 #include <assert.h>
25 #include <errno.h>
26 #include <fcntl.h>
27 #include <stdio.h>
28 #include <signal.h>
29 #include <stdarg.h>
30 #include <sys/types.h>
31 #ifdef HAVE_SYS_PTRACE_H
32 # include <sys/ptrace.h>
33 #endif
34 #ifdef HAVE_SYS_PARAM_H
35 # include <sys/param.h>
36 #endif
37 #ifdef HAVE_SYS_WAIT_H
38 # include <sys/wait.h>
39 #endif
40 #ifdef HAVE_SYS_SYSCALL_H
41 # include <sys/syscall.h>
42 #endif
43 #ifdef HAVE_SYS_THR_H
44 # include <sys/ucontext.h>
45 # include <sys/thr.h>
46 #endif
47 #include <unistd.h>
48
49 #include "ntstatus.h"
50 #define WIN32_NO_STATUS
51 #include "winternl.h"
52
53 #include "file.h"
54 #include "process.h"
55 #include "thread.h"
56
57 #ifdef USE_PTRACE
58
59 #ifndef PTRACE_CONT
60 #define PTRACE_CONT PT_CONTINUE
61 #endif
62 #ifndef PTRACE_SINGLESTEP
63 #define PTRACE_SINGLESTEP PT_STEP
64 #endif
65 #ifndef PTRACE_ATTACH
66 #define PTRACE_ATTACH PT_ATTACH
67 #endif
68 #ifndef PTRACE_DETACH
69 #define PTRACE_DETACH PT_DETACH
70 #endif
71 #ifndef PTRACE_PEEKDATA
72 #define PTRACE_PEEKDATA PT_READ_D
73 #endif
74 #ifndef PTRACE_POKEDATA
75 #define PTRACE_POKEDATA PT_WRITE_D
76 #endif
77 #ifndef PTRACE_PEEKUSER
78 #define PTRACE_PEEKUSER PT_READ_U
79 #endif
80 #ifndef PTRACE_POKEUSER
81 #define PTRACE_POKEUSER PT_WRITE_U
82 #endif
83
84 #ifdef PT_GETDBREGS
85 #define PTRACE_GETDBREGS PT_GETDBREGS
86 #endif
87 #ifdef PT_SETDBREGS
88 #define PTRACE_SETDBREGS PT_SETDBREGS
89 #endif
90
91 #ifndef HAVE_SYS_PTRACE_H
92 #define PT_CONTINUE 0
93 #define PT_ATTACH 1
94 #define PT_DETACH 2
95 #define PT_READ_D 3
96 #define PT_WRITE_D 4
97 #define PT_STEP 5
98 static inline int ptrace(int req, ...) { errno = EPERM; return -1; /*FAIL*/ }
99 #endif /* HAVE_SYS_PTRACE_H */
100
101 /* handle a status returned by wait4 */
102 static int handle_child_status( struct thread *thread, int pid, int status, int want_sig )
103 {
104 if (WIFSTOPPED(status))
105 {
106 int sig = WSTOPSIG(status);
107 if (debug_level && thread)
108 fprintf( stderr, "%04x: *signal* signal=%d\n", thread->id, sig );
109 if (sig != want_sig)
110 {
111 /* ignore other signals for now */
112 ptrace( PTRACE_CONT, pid, (caddr_t)1, sig );
113 }
114 return sig;
115 }
116 if (thread && (WIFSIGNALED(status) || WIFEXITED(status)))
117 {
118 thread->unix_pid = -1;
119 thread->unix_tid = -1;
120 if (debug_level)
121 {
122 if (WIFSIGNALED(status))
123 fprintf( stderr, "%04x: *exited* signal=%d\n",
124 thread->id, WTERMSIG(status) );
125 else
126 fprintf( stderr, "%04x: *exited* status=%d\n",
127 thread->id, WEXITSTATUS(status) );
128 }
129 }
130 return 0;
131 }
132
133 /* wait4 wrapper to handle missing __WALL flag in older kernels */
134 static inline pid_t wait4_wrapper( pid_t pid, int *status, int options, struct rusage *usage )
135 {
136 #ifdef __WALL
137 static int wall_flag = __WALL;
138
139 for (;;)
140 {
141 pid_t ret = wait4( pid, status, options | wall_flag, usage );
142 if (ret != -1 || !wall_flag || errno != EINVAL) return ret;
143 wall_flag = 0;
144 }
145 #else
146 return wait4( pid, status, options, usage );
147 #endif
148 }
149
150 /* handle a SIGCHLD signal */
151 void sigchld_callback(void)
152 {
153 int pid, status;
154
155 for (;;)
156 {
157 if (!(pid = wait4_wrapper( -1, &status, WUNTRACED | WNOHANG, NULL ))) break;
158 if (pid != -1)
159 {
160 struct thread *thread = get_thread_from_tid( pid );
161 if (!thread) thread = get_thread_from_pid( pid );
162 handle_child_status( thread, pid, status, -1 );
163 }
164 else break;
165 }
166 }
167
168 /* return the Unix pid to use in ptrace calls for a given process */
169 static int get_ptrace_pid( struct thread *thread )
170 {
171 #ifdef linux /* linux always uses thread id */
172 if (thread->unix_tid != -1) return thread->unix_tid;
173 #endif
174 return thread->unix_pid;
175 }
176
177 /* return the Unix tid to use in ptrace calls for a given thread */
178 static int get_ptrace_tid( struct thread *thread )
179 {
180 if (thread->unix_tid != -1) return thread->unix_tid;
181 return thread->unix_pid;
182 }
183
184 /* wait for a ptraced child to get a certain signal */
185 static int wait4_thread( struct thread *thread, int signal )
186 {
187 int res, status;
188
189 start_watchdog();
190 for (;;)
191 {
192 if ((res = wait4_wrapper( get_ptrace_pid(thread), &status, WUNTRACED, NULL )) == -1)
193 {
194 if (errno == EINTR)
195 {
196 if (!watchdog_triggered()) continue;
197 if (debug_level) fprintf( stderr, "%04x: *watchdog* wait4 aborted\n", thread->id );
198 }
199 else if (errno == ECHILD) /* must have died */
200 {
201 thread->unix_pid = -1;
202 thread->unix_tid = -1;
203 }
204 else perror( "wait4" );
205 stop_watchdog();
206 return 0;
207 }
208 res = handle_child_status( thread, res, status, signal );
209 if (!res || res == signal) break;
210 }
211 stop_watchdog();
212 return (thread->unix_pid != -1);
213 }
214
215 /* send a signal to a specific thread */
216 static inline int tkill( int tgid, int pid, int sig )
217 {
218 #ifdef __linux__
219 int ret = syscall( SYS_tgkill, tgid, pid, sig );
220 if (ret < 0 && errno == ENOSYS) ret = syscall( SYS_tkill, pid, sig );
221 return ret;
222 #elif (defined(__FreeBSD__) || defined (__FreeBSD_kernel__)) && defined(HAVE_THR_KILL2)
223 return thr_kill2( tgid, pid, sig );
224 #else
225 errno = ENOSYS;
226 return -1;
227 #endif
228 }
229
230 /* initialize the process tracing mechanism */
231 void init_tracing_mechanism(void)
232 {
233 /* no initialization needed for ptrace */
234 }
235
236 /* initialize the per-process tracing mechanism */
237 void init_process_tracing( struct process *process )
238 {
239 /* ptrace setup is done on-demand */
240 }
241
242 /* terminate the per-process tracing mechanism */
243 void finish_process_tracing( struct process *process )
244 {
245 }
246
247 /* send a Unix signal to a specific thread */
248 int send_thread_signal( struct thread *thread, int sig )
249 {
250 int ret = -1;
251
252 if (thread->unix_pid != -1)
253 {
254 if (thread->unix_tid != -1)
255 {
256 ret = tkill( thread->unix_pid, thread->unix_tid, sig );
257 if (ret == -1 && errno == ENOSYS) ret = kill( thread->unix_pid, sig );
258 }
259 else ret = kill( thread->unix_pid, sig );
260
261 if (ret == -1 && errno == ESRCH) /* thread got killed */
262 {
263 thread->unix_pid = -1;
264 thread->unix_tid = -1;
265 }
266 }
267 if (debug_level && ret != -1)
268 fprintf( stderr, "%04x: *sent signal* signal=%d\n", thread->id, sig );
269 return (ret != -1);
270 }
271
272 /* resume a thread after we have used ptrace on it */
273 static void resume_after_ptrace( struct thread *thread )
274 {
275 if (thread->unix_pid == -1) return;
276 if (ptrace( PTRACE_DETACH, get_ptrace_pid(thread), (caddr_t)1, 0 ) == -1)
277 {
278 if (errno == ESRCH) thread->unix_pid = thread->unix_tid = -1; /* thread got killed */
279 }
280 }
281
282 /* suspend a thread to allow using ptrace on it */
283 /* you must do a resume_after_ptrace when finished with the thread */
284 static int suspend_for_ptrace( struct thread *thread )
285 {
286 /* can't stop a thread while initialisation is in progress */
287 if (thread->unix_pid == -1 || !is_process_init_done(thread->process)) goto error;
288
289 /* this may fail if the client is already being debugged */
290 if (ptrace( PTRACE_ATTACH, get_ptrace_pid(thread), 0, 0 ) == -1)
291 {
292 if (errno == ESRCH) thread->unix_pid = thread->unix_tid = -1; /* thread got killed */
293 goto error;
294 }
295 if (wait4_thread( thread, SIGSTOP )) return 1;
296 resume_after_ptrace( thread );
297 error:
298 set_error( STATUS_ACCESS_DENIED );
299 return 0;
300 }
301
302 /* read a long from a thread address space */
303 static long read_thread_long( struct thread *thread, long *addr, long *data )
304 {
305 errno = 0;
306 *data = ptrace( PTRACE_PEEKDATA, get_ptrace_pid(thread), (caddr_t)addr, 0 );
307 if ( *data == -1 && errno)
308 {
309 file_set_error();
310 return -1;
311 }
312 return 0;
313 }
314
315 /* write a long to a thread address space */
316 static long write_thread_long( struct thread *thread, long *addr, long data, unsigned long mask )
317 {
318 long res;
319 if (mask != ~0ul)
320 {
321 if (read_thread_long( thread, addr, &res ) == -1) return -1;
322 data = (data & mask) | (res & ~mask);
323 }
324 if ((res = ptrace( PTRACE_POKEDATA, get_ptrace_pid(thread), (caddr_t)addr, data )) == -1)
325 file_set_error();
326 return res;
327 }
328
329 /* return a thread of the process suitable for ptracing */
330 static struct thread *get_ptrace_thread( struct process *process )
331 {
332 struct thread *thread;
333
334 LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
335 {
336 if (thread->unix_pid != -1) return thread;
337 }
338 set_error( STATUS_ACCESS_DENIED ); /* process is dead */
339 return NULL;
340 }
341
342 /* read data from a process memory space */
343 int read_process_memory( struct process *process, client_ptr_t ptr, data_size_t size, char *dest )
344 {
345 struct thread *thread = get_ptrace_thread( process );
346 unsigned int first_offset, last_offset, len;
347 long data, *addr;
348
349 if (!thread) return 0;
350
351 if ((unsigned long)ptr != ptr)
352 {
353 set_error( STATUS_ACCESS_DENIED );
354 return 0;
355 }
356
357 first_offset = ptr % sizeof(long);
358 last_offset = (size + first_offset) % sizeof(long);
359 if (!last_offset) last_offset = sizeof(long);
360
361 addr = (long *)(unsigned long)(ptr - first_offset);
362 len = (size + first_offset + sizeof(long) - 1) / sizeof(long);
363
364 if (suspend_for_ptrace( thread ))
365 {
366 if (len > 3) /* /proc/pid/mem should be faster for large sizes */
367 {
368 char procmem[24];
369 int fd;
370
371 sprintf( procmem, "/proc/%u/mem", process->unix_pid );
372 if ((fd = open( procmem, O_RDONLY )) != -1)
373 {
374 ssize_t ret = pread( fd, dest, size, ptr );
375 close( fd );
376 if (ret == size)
377 {
378 len = 0;
379 goto done;
380 }
381 }
382 }
383
384 if (len > 1)
385 {
386 if (read_thread_long( thread, addr++, &data ) == -1) goto done;
387 memcpy( dest, (char *)&data + first_offset, sizeof(long) - first_offset );
388 dest += sizeof(long) - first_offset;
389 first_offset = 0;
390 len--;
391 }
392
393 while (len > 1)
394 {
395 if (read_thread_long( thread, addr++, &data ) == -1) goto done;
396 memcpy( dest, &data, sizeof(long) );
397 dest += sizeof(long);
398 len--;
399 }
400
401 if (read_thread_long( thread, addr++, &data ) == -1) goto done;
402 memcpy( dest, (char *)&data + first_offset, last_offset - first_offset );
403 len--;
404
405 done:
406 resume_after_ptrace( thread );
407 }
408 return !len;
409 }
410
411 /* make sure we can write to the whole address range */
412 /* len is the total size (in ints) */
413 static int check_process_write_access( struct thread *thread, long *addr, data_size_t len )
414 {
415 int page = get_page_size() / sizeof(int);
416
417 for (;;)
418 {
419 if (write_thread_long( thread, addr, 0, 0 ) == -1) return 0;
420 if (len <= page) break;
421 addr += page;
422 len -= page;
423 }
424 return (write_thread_long( thread, addr + len - 1, 0, 0 ) != -1);
425 }
426
427 /* write data to a process memory space */
428 int write_process_memory( struct process *process, client_ptr_t ptr, data_size_t size, const char *src )
429 {
430 struct thread *thread = get_ptrace_thread( process );
431 int ret = 0;
432 long data = 0;
433 data_size_t len;
434 long *addr;
435 unsigned long first_mask, first_offset, last_mask, last_offset;
436
437 if (!thread) return 0;
438
439 if ((unsigned long)ptr != ptr)
440 {
441 set_error( STATUS_ACCESS_DENIED );
442 return 0;
443 }
444
445 /* compute the mask for the first long */
446 first_mask = ~0;
447 first_offset = ptr % sizeof(long);
448 memset( &first_mask, 0, first_offset );
449
450 /* compute the mask for the last long */
451 last_offset = (size + first_offset) % sizeof(long);
452 if (!last_offset) last_offset = sizeof(long);
453 last_mask = 0;
454 memset( &last_mask, 0xff, last_offset );
455
456 addr = (long *)(unsigned long)(ptr - first_offset);
457 len = (size + first_offset + sizeof(long) - 1) / sizeof(long);
458
459 if (suspend_for_ptrace( thread ))
460 {
461 if (!check_process_write_access( thread, addr, len ))
462 {
463 set_error( STATUS_ACCESS_DENIED );
464 goto done;
465 }
466 /* first word is special */
467 if (len > 1)
468 {
469 memcpy( (char *)&data + first_offset, src, sizeof(long) - first_offset );
470 src += sizeof(long) - first_offset;
471 if (write_thread_long( thread, addr++, data, first_mask ) == -1) goto done;
472 first_offset = 0;
473 len--;
474 }
475 else last_mask &= first_mask;
476
477 while (len > 1)
478 {
479 memcpy( &data, src, sizeof(long) );
480 src += sizeof(long);
481 if (write_thread_long( thread, addr++, data, ~0ul ) == -1) goto done;
482 len--;
483 }
484
485 /* last word is special too */
486 memcpy( (char *)&data + first_offset, src, last_offset - first_offset );
487 if (write_thread_long( thread, addr, data, last_mask ) == -1) goto done;
488 ret = 1;
489
490 done:
491 resume_after_ptrace( thread );
492 }
493 return ret;
494 }
495
496 /* retrieve an LDT selector entry */
497 void get_selector_entry( struct thread *thread, int entry, unsigned int *base,
498 unsigned int *limit, unsigned char *flags )
499 {
500 if (!thread->process->ldt_copy)
501 {
502 set_error( STATUS_ACCESS_DENIED );
503 return;
504 }
505 if (entry >= 8192)
506 {
507 set_error( STATUS_ACCESS_VIOLATION );
508 return;
509 }
510 if (suspend_for_ptrace( thread ))
511 {
512 unsigned char flags_buf[sizeof(long)];
513 long *addr = (long *)(unsigned long)thread->process->ldt_copy + entry;
514 if (read_thread_long( thread, addr, (long *)base ) == -1) goto done;
515 if (read_thread_long( thread, addr + 8192, (long *)limit ) == -1) goto done;
516 addr = (long *)(unsigned long)thread->process->ldt_copy + 2*8192 + (entry / sizeof(long));
517 if (read_thread_long( thread, addr, (long *)flags_buf ) == -1) goto done;
518 *flags = flags_buf[entry % sizeof(long)];
519 done:
520 resume_after_ptrace( thread );
521 }
522 }
523
524
525 #if defined(linux) && (defined(__i386__) || defined(__x86_64__))
526
527 #ifdef HAVE_SYS_USER_H
528 # include <sys/user.h>
529 #endif
530
531 /* debug register offset in struct user */
532 #define DR_OFFSET(dr) ((((struct user *)0)->u_debugreg) + (dr))
533
534 /* retrieve the thread x86 registers */
535 void get_thread_context( struct thread *thread, context_t *context, unsigned int flags )
536 {
537 int i, pid = get_ptrace_tid(thread);
538 long data[8];
539
540 /* all other regs are handled on the client side */
541 assert( flags == SERVER_CTX_DEBUG_REGISTERS );
542
543 if (!suspend_for_ptrace( thread )) return;
544
545 for (i = 0; i < 8; i++)
546 {
547 if (i == 4 || i == 5) continue;
548 errno = 0;
549 data[i] = ptrace( PTRACE_PEEKUSER, pid, DR_OFFSET(i), 0 );
550 if ((data[i] == -1) && errno)
551 {
552 file_set_error();
553 goto done;
554 }
555 }
556 switch (context->cpu)
557 {
558 case CPU_x86:
559 context->debug.i386_regs.dr0 = data[0];
560 context->debug.i386_regs.dr1 = data[1];
561 context->debug.i386_regs.dr2 = data[2];
562 context->debug.i386_regs.dr3 = data[3];
563 context->debug.i386_regs.dr6 = data[6];
564 context->debug.i386_regs.dr7 = data[7];
565 break;
566 case CPU_x86_64:
567 context->debug.x86_64_regs.dr0 = data[0];
568 context->debug.x86_64_regs.dr1 = data[1];
569 context->debug.x86_64_regs.dr2 = data[2];
570 context->debug.x86_64_regs.dr3 = data[3];
571 context->debug.x86_64_regs.dr6 = data[6];
572 context->debug.x86_64_regs.dr7 = data[7];
573 break;
574 default:
575 set_error( STATUS_INVALID_PARAMETER );
576 goto done;
577 }
578 context->flags |= SERVER_CTX_DEBUG_REGISTERS;
579 done:
580 resume_after_ptrace( thread );
581 }
582
583 /* set the thread x86 registers */
584 void set_thread_context( struct thread *thread, const context_t *context, unsigned int flags )
585 {
586 int pid = get_ptrace_tid( thread );
587
588 /* all other regs are handled on the client side */
589 assert( flags == SERVER_CTX_DEBUG_REGISTERS );
590
591 if (!suspend_for_ptrace( thread )) return;
592
593 switch (context->cpu)
594 {
595 case CPU_x86:
596 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(0), context->debug.i386_regs.dr0 ) == -1) goto error;
597 if (thread->context) thread->context->debug.i386_regs.dr0 = context->debug.i386_regs.dr0;
598 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(1), context->debug.i386_regs.dr1 ) == -1) goto error;
599 if (thread->context) thread->context->debug.i386_regs.dr1 = context->debug.i386_regs.dr1;
600 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(2), context->debug.i386_regs.dr2 ) == -1) goto error;
601 if (thread->context) thread->context->debug.i386_regs.dr2 = context->debug.i386_regs.dr2;
602 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(3), context->debug.i386_regs.dr3 ) == -1) goto error;
603 if (thread->context) thread->context->debug.i386_regs.dr3 = context->debug.i386_regs.dr3;
604 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(6), context->debug.i386_regs.dr6 ) == -1) goto error;
605 if (thread->context) thread->context->debug.i386_regs.dr6 = context->debug.i386_regs.dr6;
606 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(7), context->debug.i386_regs.dr7 ) == -1) goto error;
607 if (thread->context) thread->context->debug.i386_regs.dr7 = context->debug.i386_regs.dr7;
608 break;
609 case CPU_x86_64:
610 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(0), context->debug.x86_64_regs.dr0 ) == -1) goto error;
611 if (thread->context) thread->context->debug.x86_64_regs.dr0 = context->debug.x86_64_regs.dr0;
612 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(1), context->debug.x86_64_regs.dr1 ) == -1) goto error;
613 if (thread->context) thread->context->debug.x86_64_regs.dr1 = context->debug.x86_64_regs.dr1;
614 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(2), context->debug.x86_64_regs.dr2 ) == -1) goto error;
615 if (thread->context) thread->context->debug.x86_64_regs.dr2 = context->debug.x86_64_regs.dr2;
616 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(3), context->debug.x86_64_regs.dr3 ) == -1) goto error;
617 if (thread->context) thread->context->debug.x86_64_regs.dr3 = context->debug.x86_64_regs.dr3;
618 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(6), context->debug.x86_64_regs.dr6 ) == -1) goto error;
619 if (thread->context) thread->context->debug.x86_64_regs.dr6 = context->debug.x86_64_regs.dr6;
620 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(7), context->debug.x86_64_regs.dr7 ) == -1) goto error;
621 if (thread->context) thread->context->debug.x86_64_regs.dr7 = context->debug.x86_64_regs.dr7;
622 break;
623 default:
624 set_error( STATUS_INVALID_PARAMETER );
625 }
626 resume_after_ptrace( thread );
627 return;
628 error:
629 file_set_error();
630 resume_after_ptrace( thread );
631 }
632
633 #elif defined(__i386__) && defined(PTRACE_GETDBREGS) && defined(PTRACE_SETDBREGS) && \
634 (defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__NetBSD__))
635
636 #include <machine/reg.h>
637
638 /* retrieve the thread x86 registers */
639 void get_thread_context( struct thread *thread, context_t *context, unsigned int flags )
640 {
641 int pid = get_ptrace_tid(thread);
642 struct dbreg dbregs;
643
644 /* all other regs are handled on the client side */
645 assert( flags == SERVER_CTX_DEBUG_REGISTERS );
646
647 if (!suspend_for_ptrace( thread )) return;
648
649 if (ptrace( PTRACE_GETDBREGS, pid, (caddr_t) &dbregs, 0 ) == -1) file_set_error();
650 else
651 {
652 #ifdef DBREG_DRX
653 /* needed for FreeBSD, the structure fields have changed under 5.x */
654 context->debug.i386_regs.dr0 = DBREG_DRX((&dbregs), 0);
655 context->debug.i386_regs.dr1 = DBREG_DRX((&dbregs), 1);
656 context->debug.i386_regs.dr2 = DBREG_DRX((&dbregs), 2);
657 context->debug.i386_regs.dr3 = DBREG_DRX((&dbregs), 3);
658 context->debug.i386_regs.dr6 = DBREG_DRX((&dbregs), 6);
659 context->debug.i386_regs.dr7 = DBREG_DRX((&dbregs), 7);
660 #else
661 context->debug.i386_regs.dr0 = dbregs.dr0;
662 context->debug.i386_regs.dr1 = dbregs.dr1;
663 context->debug.i386_regs.dr2 = dbregs.dr2;
664 context->debug.i386_regs.dr3 = dbregs.dr3;
665 context->debug.i386_regs.dr6 = dbregs.dr6;
666 context->debug.i386_regs.dr7 = dbregs.dr7;
667 #endif
668 context->flags |= SERVER_CTX_DEBUG_REGISTERS;
669 }
670 resume_after_ptrace( thread );
671 }
672
673 /* set the thread x86 registers */
674 void set_thread_context( struct thread *thread, const context_t *context, unsigned int flags )
675 {
676 int pid = get_ptrace_tid(thread);
677 struct dbreg dbregs;
678
679 /* all other regs are handled on the client side */
680 assert( flags == SERVER_CTX_DEBUG_REGISTERS );
681
682 if (!suspend_for_ptrace( thread )) return;
683
684 #ifdef DBREG_DRX
685 /* needed for FreeBSD, the structure fields have changed under 5.x */
686 DBREG_DRX((&dbregs), 0) = context->debug.i386_regs.dr0;
687 DBREG_DRX((&dbregs), 1) = context->debug.i386_regs.dr1;
688 DBREG_DRX((&dbregs), 2) = context->debug.i386_regs.dr2;
689 DBREG_DRX((&dbregs), 3) = context->debug.i386_regs.dr3;
690 DBREG_DRX((&dbregs), 4) = 0;
691 DBREG_DRX((&dbregs), 5) = 0;
692 DBREG_DRX((&dbregs), 6) = context->debug.i386_regs.dr6;
693 DBREG_DRX((&dbregs), 7) = context->debug.i386_regs.dr7;
694 #else
695 dbregs.dr0 = context->debug.i386_regs.dr0;
696 dbregs.dr1 = context->debug.i386_regs.dr1;
697 dbregs.dr2 = context->debug.i386_regs.dr2;
698 dbregs.dr3 = context->debug.i386_regs.dr3;
699 dbregs.dr4 = 0;
700 dbregs.dr5 = 0;
701 dbregs.dr6 = context->debug.i386_regs.dr6;
702 dbregs.dr7 = context->debug.i386_regs.dr7;
703 #endif
704 if (ptrace( PTRACE_SETDBREGS, pid, (caddr_t) &dbregs, 0 ) == -1) file_set_error();
705 else if (thread->context)
706 thread->context->debug.i386_regs = context->debug.i386_regs; /* update the cached values */
707 resume_after_ptrace( thread );
708 }
709
710 #else /* linux || __FreeBSD__ */
711
712 /* retrieve the thread x86 registers */
713 void get_thread_context( struct thread *thread, context_t *context, unsigned int flags )
714 {
715 }
716
717 /* set the thread x86 debug registers */
718 void set_thread_context( struct thread *thread, const context_t *context, unsigned int flags )
719 {
720 }
721
722 #endif /* linux || __FreeBSD__ */
723
724 #endif /* USE_PTRACE */
725
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