opcservices/tests: Fix copy-pasted copyright line.
[wine.git] / server / ptrace.c
blob4eda8ebec35142799bcb234da434303ed6f238c6
1 /*
2 * Server-side ptrace support
4 * Copyright (C) 1999 Alexandre Julliard
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.
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.
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
21 #include "config.h"
22 #include "wine/port.h"
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_UCONTEXT_H
44 # include <sys/ucontext.h>
45 #endif
46 #ifdef HAVE_SYS_THR_H
47 # include <sys/thr.h>
48 #endif
49 #include <unistd.h>
51 #include "ntstatus.h"
52 #define WIN32_NO_STATUS
53 #include "winternl.h"
55 #include "file.h"
56 #include "process.h"
57 #include "thread.h"
59 #ifdef USE_PTRACE
61 #ifndef PTRACE_CONT
62 #define PTRACE_CONT PT_CONTINUE
63 #endif
64 #ifndef PTRACE_SINGLESTEP
65 #define PTRACE_SINGLESTEP PT_STEP
66 #endif
67 #ifndef PTRACE_ATTACH
68 #define PTRACE_ATTACH PT_ATTACH
69 #endif
70 #ifndef PTRACE_DETACH
71 #define PTRACE_DETACH PT_DETACH
72 #endif
73 #ifndef PTRACE_PEEKDATA
74 #define PTRACE_PEEKDATA PT_READ_D
75 #endif
76 #ifndef PTRACE_POKEDATA
77 #define PTRACE_POKEDATA PT_WRITE_D
78 #endif
79 #ifndef PTRACE_PEEKUSER
80 #define PTRACE_PEEKUSER PT_READ_U
81 #endif
82 #ifndef PTRACE_POKEUSER
83 #define PTRACE_POKEUSER PT_WRITE_U
84 #endif
86 #ifdef PT_GETDBREGS
87 #define PTRACE_GETDBREGS PT_GETDBREGS
88 #endif
89 #ifdef PT_SETDBREGS
90 #define PTRACE_SETDBREGS PT_SETDBREGS
91 #endif
93 #ifndef HAVE_SYS_PTRACE_H
94 #define PT_CONTINUE 0
95 #define PT_ATTACH 1
96 #define PT_DETACH 2
97 #define PT_READ_D 3
98 #define PT_WRITE_D 4
99 #define PT_STEP 5
100 static inline int ptrace(int req, ...) { errno = EPERM; return -1; /*FAIL*/ }
101 #endif /* HAVE_SYS_PTRACE_H */
103 #ifndef __WALL
104 #define __WALL 0
105 #endif
107 /* handle a status returned by waitpid */
108 static int handle_child_status( struct thread *thread, int pid, int status, int want_sig )
110 if (WIFSTOPPED(status))
112 int sig = WSTOPSIG(status);
113 if (debug_level && thread)
114 fprintf( stderr, "%04x: *signal* signal=%d\n", thread->id, sig );
115 if (sig != want_sig)
117 /* ignore other signals for now */
118 ptrace( PTRACE_CONT, pid, (caddr_t)1, sig );
120 return sig;
122 if (thread && (WIFSIGNALED(status) || WIFEXITED(status)))
124 thread->unix_pid = -1;
125 thread->unix_tid = -1;
126 if (debug_level)
128 if (WIFSIGNALED(status))
129 fprintf( stderr, "%04x: *exited* signal=%d\n",
130 thread->id, WTERMSIG(status) );
131 else
132 fprintf( stderr, "%04x: *exited* status=%d\n",
133 thread->id, WEXITSTATUS(status) );
136 return 0;
139 /* handle a SIGCHLD signal */
140 void sigchld_callback(void)
142 int pid, status;
144 for (;;)
146 if (!(pid = waitpid( -1, &status, WUNTRACED | WNOHANG | __WALL ))) break;
147 if (pid != -1)
149 struct thread *thread = get_thread_from_tid( pid );
150 if (!thread) thread = get_thread_from_pid( pid );
151 handle_child_status( thread, pid, status, -1 );
153 else break;
157 /* return the Unix pid to use in ptrace calls for a given process */
158 static int get_ptrace_pid( struct thread *thread )
160 #ifdef linux /* linux always uses thread id */
161 if (thread->unix_tid != -1) return thread->unix_tid;
162 #endif
163 return thread->unix_pid;
166 /* return the Unix tid to use in ptrace calls for a given thread */
167 static int get_ptrace_tid( struct thread *thread )
169 if (thread->unix_tid != -1) return thread->unix_tid;
170 return thread->unix_pid;
173 /* wait for a ptraced child to get a certain signal */
174 static int waitpid_thread( struct thread *thread, int signal )
176 int res, status;
178 start_watchdog();
179 for (;;)
181 if ((res = waitpid( get_ptrace_pid(thread), &status, WUNTRACED | __WALL )) == -1)
183 if (errno == EINTR)
185 if (!watchdog_triggered()) continue;
186 if (debug_level) fprintf( stderr, "%04x: *watchdog* waitpid aborted\n", thread->id );
188 else if (errno == ECHILD) /* must have died */
190 thread->unix_pid = -1;
191 thread->unix_tid = -1;
193 else perror( "waitpid" );
194 stop_watchdog();
195 return 0;
197 res = handle_child_status( thread, res, status, signal );
198 if (!res || res == signal) break;
200 stop_watchdog();
201 return (thread->unix_pid != -1);
204 /* send a signal to a specific thread */
205 static inline int tkill( int tgid, int pid, int sig )
207 #ifdef __linux__
208 int ret = syscall( __NR_tgkill, tgid, pid, sig );
209 if (ret < 0 && errno == ENOSYS) ret = syscall( __NR_tkill, pid, sig );
210 return ret;
211 #elif (defined(__FreeBSD__) || defined (__FreeBSD_kernel__)) && defined(HAVE_THR_KILL2)
212 return thr_kill2( tgid, pid, sig );
213 #else
214 errno = ENOSYS;
215 return -1;
216 #endif
219 /* initialize the process tracing mechanism */
220 void init_tracing_mechanism(void)
222 /* no initialization needed for ptrace */
225 /* initialize the per-process tracing mechanism */
226 void init_process_tracing( struct process *process )
228 /* ptrace setup is done on-demand */
231 /* terminate the per-process tracing mechanism */
232 void finish_process_tracing( struct process *process )
236 /* send a Unix signal to a specific thread */
237 int send_thread_signal( struct thread *thread, int sig )
239 int ret = -1;
241 if (thread->unix_pid != -1)
243 if (thread->unix_tid != -1)
245 ret = tkill( thread->unix_pid, thread->unix_tid, sig );
246 if (ret == -1 && errno == ENOSYS) ret = kill( thread->unix_pid, sig );
248 else ret = kill( thread->unix_pid, sig );
250 if (ret == -1 && errno == ESRCH) /* thread got killed */
252 thread->unix_pid = -1;
253 thread->unix_tid = -1;
256 if (debug_level && ret != -1)
257 fprintf( stderr, "%04x: *sent signal* signal=%d\n", thread->id, sig );
258 return (ret != -1);
261 /* resume a thread after we have used ptrace on it */
262 static void resume_after_ptrace( struct thread *thread )
264 if (thread->unix_pid == -1) return;
265 if (ptrace( PTRACE_DETACH, get_ptrace_pid(thread), (caddr_t)1, 0 ) == -1)
267 if (errno == ESRCH) thread->unix_pid = thread->unix_tid = -1; /* thread got killed */
271 /* suspend a thread to allow using ptrace on it */
272 /* you must do a resume_after_ptrace when finished with the thread */
273 static int suspend_for_ptrace( struct thread *thread )
275 /* can't stop a thread while initialisation is in progress */
276 if (thread->unix_pid == -1 || !is_process_init_done(thread->process)) goto error;
278 /* this may fail if the client is already being debugged */
279 if (ptrace( PTRACE_ATTACH, get_ptrace_pid(thread), 0, 0 ) == -1)
281 if (errno == ESRCH) thread->unix_pid = thread->unix_tid = -1; /* thread got killed */
282 goto error;
284 if (waitpid_thread( thread, SIGSTOP )) return 1;
285 resume_after_ptrace( thread );
286 error:
287 set_error( STATUS_ACCESS_DENIED );
288 return 0;
291 /* read a long from a thread address space */
292 static int read_thread_long( struct thread *thread, void *addr, unsigned long *data )
294 errno = 0;
295 *data = ptrace( PTRACE_PEEKDATA, get_ptrace_pid(thread), (caddr_t)addr, 0 );
296 if ( *data == -1 && errno)
298 file_set_error();
299 return -1;
301 return 0;
304 static int read_thread_int( struct thread *thread, void *addr, unsigned int *data )
306 unsigned long long_data;
307 int ret;
309 ret = read_thread_long( thread, addr, &long_data );
310 *data = long_data;
311 return ret;
314 /* write a long to a thread address space */
315 static long write_thread_long( struct thread *thread, void *addr, unsigned long data, unsigned long mask )
317 unsigned long old_data;
318 int res;
320 if (mask != ~0ul)
322 if (read_thread_long( thread, addr, &old_data ) == -1) return -1;
323 data = (data & mask) | (old_data & ~mask);
325 if ((res = ptrace( PTRACE_POKEDATA, get_ptrace_pid(thread), (caddr_t)addr, data )) == -1)
326 file_set_error();
327 return res;
330 /* return a thread of the process suitable for ptracing */
331 static struct thread *get_ptrace_thread( struct process *process )
333 struct thread *thread;
335 LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
337 if (thread->unix_pid != -1) return thread;
339 set_error( STATUS_PROCESS_IS_TERMINATING ); /* process is dead */
340 return NULL;
343 /* read data from a process memory space */
344 int read_process_memory( struct process *process, client_ptr_t ptr, data_size_t size, char *dest )
346 struct thread *thread = get_ptrace_thread( process );
347 unsigned int first_offset, last_offset, len;
348 unsigned long data, *addr;
350 if (!thread) return 0;
352 if ((unsigned long)ptr != ptr)
354 set_error( STATUS_ACCESS_DENIED );
355 return 0;
358 first_offset = ptr % sizeof(long);
359 last_offset = (size + first_offset) % sizeof(long);
360 if (!last_offset) last_offset = sizeof(long);
362 addr = (unsigned long *)(unsigned long)(ptr - first_offset);
363 len = (size + first_offset + sizeof(long) - 1) / sizeof(long);
365 if (suspend_for_ptrace( thread ))
367 if (len > 3) /* /proc/pid/mem should be faster for large sizes */
369 char procmem[24];
370 int fd;
372 sprintf( procmem, "/proc/%u/mem", process->unix_pid );
373 if ((fd = open( procmem, O_RDONLY )) != -1)
375 ssize_t ret = pread( fd, dest, size, ptr );
376 close( fd );
377 if (ret == size)
379 len = 0;
380 goto done;
385 if (len > 1)
387 if (read_thread_long( thread, addr++, &data ) == -1) goto done;
388 memcpy( dest, (char *)&data + first_offset, sizeof(long) - first_offset );
389 dest += sizeof(long) - first_offset;
390 first_offset = 0;
391 len--;
394 while (len > 1)
396 if (read_thread_long( thread, addr++, &data ) == -1) goto done;
397 memcpy( dest, &data, sizeof(long) );
398 dest += sizeof(long);
399 len--;
402 if (read_thread_long( thread, addr++, &data ) == -1) goto done;
403 memcpy( dest, (char *)&data + first_offset, last_offset - first_offset );
404 len--;
406 done:
407 resume_after_ptrace( thread );
409 return !len;
412 /* make sure we can write to the whole address range */
413 /* len is the total size (in ints) */
414 static int check_process_write_access( struct thread *thread, long *addr, data_size_t len )
416 int page = get_page_size() / sizeof(int);
418 for (;;)
420 if (write_thread_long( thread, addr, 0, 0 ) == -1) return 0;
421 if (len <= page) break;
422 addr += page;
423 len -= page;
425 return (write_thread_long( thread, addr + len - 1, 0, 0 ) != -1);
428 /* write data to a process memory space */
429 int write_process_memory( struct process *process, client_ptr_t ptr, data_size_t size, const char *src )
431 struct thread *thread = get_ptrace_thread( process );
432 int ret = 0;
433 long data = 0;
434 data_size_t len;
435 long *addr;
436 unsigned long first_mask, first_offset, last_mask, last_offset;
438 if (!thread) return 0;
440 if ((unsigned long)ptr != ptr)
442 set_error( STATUS_ACCESS_DENIED );
443 return 0;
446 /* compute the mask for the first long */
447 first_mask = ~0;
448 first_offset = ptr % sizeof(long);
449 memset( &first_mask, 0, first_offset );
451 /* compute the mask for the last long */
452 last_offset = (size + first_offset) % sizeof(long);
453 if (!last_offset) last_offset = sizeof(long);
454 last_mask = 0;
455 memset( &last_mask, 0xff, last_offset );
457 addr = (long *)(unsigned long)(ptr - first_offset);
458 len = (size + first_offset + sizeof(long) - 1) / sizeof(long);
460 if (suspend_for_ptrace( thread ))
462 if (!check_process_write_access( thread, addr, len ))
464 set_error( STATUS_ACCESS_DENIED );
465 goto done;
468 if (len > 3)
470 char procmem[24];
471 int fd;
473 sprintf( procmem, "/proc/%u/mem", process->unix_pid );
474 if ((fd = open( procmem, O_WRONLY )) != -1)
476 ssize_t r = pwrite( fd, src, size, ptr );
477 close( fd );
478 if (r == size)
480 ret = 1;
481 goto done;
486 /* first word is special */
487 if (len > 1)
489 memcpy( (char *)&data + first_offset, src, sizeof(long) - first_offset );
490 src += sizeof(long) - first_offset;
491 if (write_thread_long( thread, addr++, data, first_mask ) == -1) goto done;
492 first_offset = 0;
493 len--;
495 else last_mask &= first_mask;
497 while (len > 1)
499 memcpy( &data, src, sizeof(long) );
500 src += sizeof(long);
501 if (write_thread_long( thread, addr++, data, ~0ul ) == -1) goto done;
502 len--;
505 /* last word is special too */
506 memcpy( (char *)&data + first_offset, src, last_offset - first_offset );
507 if (write_thread_long( thread, addr, data, last_mask ) == -1) goto done;
508 ret = 1;
510 done:
511 resume_after_ptrace( thread );
513 return ret;
516 /* retrieve an LDT selector entry */
517 void get_selector_entry( struct thread *thread, int entry, unsigned int *base,
518 unsigned int *limit, unsigned char *flags )
520 if (!thread->process->ldt_copy)
522 set_error( STATUS_ACCESS_DENIED );
523 return;
525 if (entry >= 8192)
527 set_error( STATUS_ACCESS_VIOLATION );
528 return;
530 if (suspend_for_ptrace( thread ))
532 unsigned int flags_buf;
533 unsigned long addr = (unsigned long)thread->process->ldt_copy + (entry * 4);
535 if (read_thread_int( thread, (void *)addr, base ) == -1) goto done;
536 if (read_thread_int( thread, (void *)(addr + (8192 * 4)), limit ) == -1) goto done;
537 addr = (unsigned long)thread->process->ldt_copy + (2 * 8192 * 4) + (entry & ~3);
538 if (read_thread_int( thread, (void *)addr, &flags_buf ) == -1) goto done;
539 *flags = flags_buf >> (entry & 3) * 8;
540 done:
541 resume_after_ptrace( thread );
546 #if defined(linux) && (defined(HAVE_SYS_USER_H) || defined(HAVE_ASM_USER_H)) \
547 && (defined(__i386__) || defined(__x86_64__))
549 #ifdef HAVE_SYS_USER_H
550 #include <sys/user.h>
551 #elif defined(HAVE_ASM_USER_H)
552 #include <asm/user.h>
553 #endif
555 /* debug register offset in struct user */
556 #define DR_OFFSET(dr) ((((struct user *)0)->u_debugreg) + (dr))
558 /* initialize registers in new thread if necessary */
559 void init_thread_context( struct thread *thread )
561 /* Linux doesn't clear all registers, but hopefully enough to avoid spurious breakpoints */
562 thread->system_regs = 0;
565 /* retrieve the thread x86 registers */
566 void get_thread_context( struct thread *thread, context_t *context, unsigned int flags )
568 int i, pid = get_ptrace_tid(thread);
569 long data[8];
571 /* all other regs are handled on the client side */
572 assert( flags == SERVER_CTX_DEBUG_REGISTERS );
574 if (!suspend_for_ptrace( thread )) return;
576 if (!(thread->system_regs & SERVER_CTX_DEBUG_REGISTERS))
578 /* caller has initialized everything to 0 already, just return */
579 context->flags |= SERVER_CTX_DEBUG_REGISTERS;
580 goto done;
583 for (i = 0; i < 8; i++)
585 if (i == 4 || i == 5) continue;
586 errno = 0;
587 data[i] = ptrace( PTRACE_PEEKUSER, pid, DR_OFFSET(i), 0 );
588 if ((data[i] == -1) && errno)
590 file_set_error();
591 goto done;
594 switch (context->cpu)
596 case CPU_x86:
597 context->debug.i386_regs.dr0 = data[0];
598 context->debug.i386_regs.dr1 = data[1];
599 context->debug.i386_regs.dr2 = data[2];
600 context->debug.i386_regs.dr3 = data[3];
601 context->debug.i386_regs.dr6 = data[6];
602 context->debug.i386_regs.dr7 = data[7];
603 break;
604 case CPU_x86_64:
605 context->debug.x86_64_regs.dr0 = data[0];
606 context->debug.x86_64_regs.dr1 = data[1];
607 context->debug.x86_64_regs.dr2 = data[2];
608 context->debug.x86_64_regs.dr3 = data[3];
609 context->debug.x86_64_regs.dr6 = data[6];
610 context->debug.x86_64_regs.dr7 = data[7];
611 break;
612 default:
613 set_error( STATUS_INVALID_PARAMETER );
614 goto done;
616 context->flags |= SERVER_CTX_DEBUG_REGISTERS;
617 done:
618 resume_after_ptrace( thread );
621 /* set the thread x86 registers */
622 void set_thread_context( struct thread *thread, const context_t *context, unsigned int flags )
624 int pid = get_ptrace_tid( thread );
626 /* all other regs are handled on the client side */
627 assert( flags == SERVER_CTX_DEBUG_REGISTERS );
629 if (!suspend_for_ptrace( thread )) return;
631 switch (context->cpu)
633 case CPU_x86:
634 /* Linux 2.6.33+ does DR0-DR3 alignment validation, so it has to know LEN bits first */
635 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(7), context->debug.i386_regs.dr7 & 0xffff0000 ) == -1) goto error;
636 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(0), context->debug.i386_regs.dr0 ) == -1) goto error;
637 if (thread->context) thread->context->debug.i386_regs.dr0 = context->debug.i386_regs.dr0;
638 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(1), context->debug.i386_regs.dr1 ) == -1) goto error;
639 if (thread->context) thread->context->debug.i386_regs.dr1 = context->debug.i386_regs.dr1;
640 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(2), context->debug.i386_regs.dr2 ) == -1) goto error;
641 if (thread->context) thread->context->debug.i386_regs.dr2 = context->debug.i386_regs.dr2;
642 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(3), context->debug.i386_regs.dr3 ) == -1) goto error;
643 if (thread->context) thread->context->debug.i386_regs.dr3 = context->debug.i386_regs.dr3;
644 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(6), context->debug.i386_regs.dr6 ) == -1) goto error;
645 if (thread->context) thread->context->debug.i386_regs.dr6 = context->debug.i386_regs.dr6;
646 /* Linux 2.6.33+ needs enable bits set briefly to update value returned by PEEKUSER later */
647 ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(7), context->debug.i386_regs.dr7 | 0x55 );
648 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(7), context->debug.i386_regs.dr7 ) == -1) goto error;
649 if (thread->context) thread->context->debug.i386_regs.dr7 = context->debug.i386_regs.dr7;
650 thread->system_regs |= SERVER_CTX_DEBUG_REGISTERS;
651 break;
652 case CPU_x86_64:
653 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(7), context->debug.x86_64_regs.dr7 & 0xffff0000 ) == -1) goto error;
654 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(0), context->debug.x86_64_regs.dr0 ) == -1) goto error;
655 if (thread->context) thread->context->debug.x86_64_regs.dr0 = context->debug.x86_64_regs.dr0;
656 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(1), context->debug.x86_64_regs.dr1 ) == -1) goto error;
657 if (thread->context) thread->context->debug.x86_64_regs.dr1 = context->debug.x86_64_regs.dr1;
658 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(2), context->debug.x86_64_regs.dr2 ) == -1) goto error;
659 if (thread->context) thread->context->debug.x86_64_regs.dr2 = context->debug.x86_64_regs.dr2;
660 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(3), context->debug.x86_64_regs.dr3 ) == -1) goto error;
661 if (thread->context) thread->context->debug.x86_64_regs.dr3 = context->debug.x86_64_regs.dr3;
662 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(6), context->debug.x86_64_regs.dr6 ) == -1) goto error;
663 if (thread->context) thread->context->debug.x86_64_regs.dr6 = context->debug.x86_64_regs.dr6;
664 ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(7), context->debug.x86_64_regs.dr7 | 0x55 );
665 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(7), context->debug.x86_64_regs.dr7 ) == -1) goto error;
666 if (thread->context) thread->context->debug.x86_64_regs.dr7 = context->debug.x86_64_regs.dr7;
667 thread->system_regs |= SERVER_CTX_DEBUG_REGISTERS;
668 break;
669 default:
670 set_error( STATUS_INVALID_PARAMETER );
672 resume_after_ptrace( thread );
673 return;
674 error:
675 file_set_error();
676 resume_after_ptrace( thread );
679 #elif defined(__i386__) && defined(PTRACE_GETDBREGS) && defined(PTRACE_SETDBREGS) && \
680 (defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__DragonFly__))
682 #include <machine/reg.h>
684 /* initialize registers in new thread if necessary */
685 void init_thread_context( struct thread *thread )
687 if (!(thread->system_regs & SERVER_CTX_DEBUG_REGISTERS)) return;
689 /* FreeBSD doesn't clear the debug registers in new threads */
690 if (suspend_for_ptrace( thread ))
692 struct dbreg dbregs;
694 memset( &dbregs, 0, sizeof(dbregs) );
695 ptrace( PTRACE_SETDBREGS, get_ptrace_tid( thread ), (caddr_t)&dbregs, 0 );
696 resume_after_ptrace( thread );
698 thread->system_regs = 0;
701 /* retrieve the thread x86 registers */
702 void get_thread_context( struct thread *thread, context_t *context, unsigned int flags )
704 int pid = get_ptrace_tid(thread);
705 struct dbreg dbregs;
707 /* all other regs are handled on the client side */
708 assert( flags == SERVER_CTX_DEBUG_REGISTERS );
710 if (!suspend_for_ptrace( thread )) return;
712 if (ptrace( PTRACE_GETDBREGS, pid, (caddr_t) &dbregs, 0 ) == -1) file_set_error();
713 else
715 #ifdef DBREG_DRX
716 /* needed for FreeBSD, the structure fields have changed under 5.x */
717 context->debug.i386_regs.dr0 = DBREG_DRX((&dbregs), 0);
718 context->debug.i386_regs.dr1 = DBREG_DRX((&dbregs), 1);
719 context->debug.i386_regs.dr2 = DBREG_DRX((&dbregs), 2);
720 context->debug.i386_regs.dr3 = DBREG_DRX((&dbregs), 3);
721 context->debug.i386_regs.dr6 = DBREG_DRX((&dbregs), 6);
722 context->debug.i386_regs.dr7 = DBREG_DRX((&dbregs), 7);
723 #else
724 context->debug.i386_regs.dr0 = dbregs.dr0;
725 context->debug.i386_regs.dr1 = dbregs.dr1;
726 context->debug.i386_regs.dr2 = dbregs.dr2;
727 context->debug.i386_regs.dr3 = dbregs.dr3;
728 context->debug.i386_regs.dr6 = dbregs.dr6;
729 context->debug.i386_regs.dr7 = dbregs.dr7;
730 #endif
731 context->flags |= SERVER_CTX_DEBUG_REGISTERS;
733 resume_after_ptrace( thread );
736 /* set the thread x86 registers */
737 void set_thread_context( struct thread *thread, const context_t *context, unsigned int flags )
739 int pid = get_ptrace_tid(thread);
740 struct dbreg dbregs;
742 /* all other regs are handled on the client side */
743 assert( flags == SERVER_CTX_DEBUG_REGISTERS );
745 if (!suspend_for_ptrace( thread )) return;
747 #ifdef DBREG_DRX
748 /* needed for FreeBSD, the structure fields have changed under 5.x */
749 DBREG_DRX((&dbregs), 0) = context->debug.i386_regs.dr0;
750 DBREG_DRX((&dbregs), 1) = context->debug.i386_regs.dr1;
751 DBREG_DRX((&dbregs), 2) = context->debug.i386_regs.dr2;
752 DBREG_DRX((&dbregs), 3) = context->debug.i386_regs.dr3;
753 DBREG_DRX((&dbregs), 4) = 0;
754 DBREG_DRX((&dbregs), 5) = 0;
755 DBREG_DRX((&dbregs), 6) = context->debug.i386_regs.dr6;
756 DBREG_DRX((&dbregs), 7) = context->debug.i386_regs.dr7;
757 #else
758 dbregs.dr0 = context->debug.i386_regs.dr0;
759 dbregs.dr1 = context->debug.i386_regs.dr1;
760 dbregs.dr2 = context->debug.i386_regs.dr2;
761 dbregs.dr3 = context->debug.i386_regs.dr3;
762 dbregs.dr4 = 0;
763 dbregs.dr5 = 0;
764 dbregs.dr6 = context->debug.i386_regs.dr6;
765 dbregs.dr7 = context->debug.i386_regs.dr7;
766 #endif
767 if (ptrace( PTRACE_SETDBREGS, pid, (caddr_t)&dbregs, 0 ) != -1)
769 if (thread->context)
770 thread->context->debug.i386_regs = context->debug.i386_regs; /* update the cached values */
771 thread->system_regs |= SERVER_CTX_DEBUG_REGISTERS;
773 else file_set_error();
775 resume_after_ptrace( thread );
778 #else /* linux || __FreeBSD__ */
780 /* initialize registers in new thread if necessary */
781 void init_thread_context( struct thread *thread )
785 /* retrieve the thread x86 registers */
786 void get_thread_context( struct thread *thread, context_t *context, unsigned int flags )
790 /* set the thread x86 debug registers */
791 void set_thread_context( struct thread *thread, const context_t *context, unsigned int flags )
795 #endif /* linux || __FreeBSD__ */
797 #endif /* USE_PTRACE */