Sweden-Number/server/context_i386.c

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/*
* i386 register context support
*
* Copyright (C) 1999 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#ifdef __i386__
#include <assert.h>
#include <errno.h>
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#ifdef HAVE_SYS_REG_H
#include <sys/reg.h>
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#endif
#include <stdarg.h>
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#include <unistd.h>
#ifdef HAVE_SYS_PTRACE_H
# include <sys/ptrace.h>
#endif
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#include "windef.h"
#include "file.h"
#include "thread.h"
#include "request.h"
#ifndef PTRACE_PEEKUSER
# ifdef PTRACE_PEEKUSR /* libc5 uses USR not USER */
# define PTRACE_PEEKUSER PTRACE_PEEKUSR
# else
# define PTRACE_PEEKUSER PT_READ_U
# endif
#endif
#ifndef PTRACE_POKEUSER
# ifdef PTRACE_POKEUSR /* libc5 uses USR not USER */
# define PTRACE_POKEUSER PTRACE_POKEUSR
# else
# define PTRACE_POKEUSER PT_WRITE_U
# endif
#endif
#ifdef PT_GETDBREGS
#define PTRACE_GETDBREGS PT_GETDBREGS
#endif
#ifdef PT_SETDBREGS
#define PTRACE_SETDBREGS PT_SETDBREGS
#endif
#ifdef linux
#ifdef HAVE_SYS_USER_H
# include <sys/user.h>
#endif
/* debug register offset in struct user */
#define DR_OFFSET(dr) ((int)((((struct user *)0)->u_debugreg) + (dr)))
/* retrieve a debug register */
static inline int get_debug_reg( int pid, int num, DWORD *data )
{
int res;
errno = 0;
res = ptrace( PTRACE_PEEKUSER, pid, DR_OFFSET(num), 0 );
if ((res == -1) && errno)
{
file_set_error();
return -1;
}
*data = res;
return 0;
}
/* retrieve the thread x86 debug registers */
static int get_thread_debug_regs( struct thread *thread, CONTEXT *context )
{
int pid = get_ptrace_pid(thread);
if (get_debug_reg( pid, 0, &context->Dr0 ) == -1) goto error;
if (get_debug_reg( pid, 1, &context->Dr1 ) == -1) goto error;
if (get_debug_reg( pid, 2, &context->Dr2 ) == -1) goto error;
if (get_debug_reg( pid, 3, &context->Dr3 ) == -1) goto error;
if (get_debug_reg( pid, 6, &context->Dr6 ) == -1) goto error;
if (get_debug_reg( pid, 7, &context->Dr7 ) == -1) goto error;
return 1;
error:
file_set_error();
return 0;
}
/* set the thread x86 debug registers */
static int set_thread_debug_regs( struct thread *thread, const CONTEXT *context )
{
int pid = get_ptrace_pid(thread);
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(0), context->Dr0 ) == -1) goto error;
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(1), context->Dr1 ) == -1) goto error;
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(2), context->Dr2 ) == -1) goto error;
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(3), context->Dr3 ) == -1) goto error;
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(6), context->Dr6 ) == -1) goto error;
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(7), context->Dr7 ) == -1) goto error;
return 1;
error:
file_set_error();
return 0;
}
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__NetBSD__)
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#include <machine/reg.h>
/* retrieve the thread x86 debug registers */
static int get_thread_debug_regs( struct thread *thread, CONTEXT *context )
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{
#ifdef PTRACE_GETDBREGS
int pid = get_ptrace_pid(thread);
struct dbreg dbregs;
if (ptrace( PTRACE_GETDBREGS, pid, (caddr_t) &dbregs, 0 ) == -1)
goto error;
#ifdef DBREG_DRX
/* needed for FreeBSD, the structure fields have changed under 5.x */
context->Dr0 = DBREG_DRX((&dbregs), 0);
context->Dr1 = DBREG_DRX((&dbregs), 1);
context->Dr2 = DBREG_DRX((&dbregs), 2);
context->Dr3 = DBREG_DRX((&dbregs), 3);
context->Dr6 = DBREG_DRX((&dbregs), 6);
context->Dr7 = DBREG_DRX((&dbregs), 7);
#else
context->Dr0 = dbregs.dr0;
context->Dr1 = dbregs.dr1;
context->Dr2 = dbregs.dr2;
context->Dr3 = dbregs.dr3;
context->Dr6 = dbregs.dr6;
context->Dr7 = dbregs.dr7;
#endif
return 1;
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error:
file_set_error();
#endif
return 0;
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}
/* set the thread x86 debug registers */
static int set_thread_debug_regs( struct thread *thread, const CONTEXT *context )
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{
#ifdef PTRACE_SETDBREGS
int pid = get_ptrace_pid(thread);
struct dbreg dbregs;
#ifdef DBREG_DRX
/* needed for FreeBSD, the structure fields have changed under 5.x */
DBREG_DRX((&dbregs), 0) = context->Dr0;
DBREG_DRX((&dbregs), 1) = context->Dr1;
DBREG_DRX((&dbregs), 2) = context->Dr2;
DBREG_DRX((&dbregs), 3) = context->Dr3;
DBREG_DRX((&dbregs), 4) = 0;
DBREG_DRX((&dbregs), 5) = 0;
DBREG_DRX((&dbregs), 6) = context->Dr6;
DBREG_DRX((&dbregs), 7) = context->Dr7;
#else
dbregs.dr0 = context->Dr0;
dbregs.dr1 = context->Dr1;
dbregs.dr2 = context->Dr2;
dbregs.dr3 = context->Dr3;
dbregs.dr4 = 0;
dbregs.dr5 = 0;
dbregs.dr6 = context->Dr6;
dbregs.dr7 = context->Dr7;
#endif
if (ptrace( PTRACE_SETDBREGS, pid, (caddr_t) &dbregs, 0 ) != -1) return 1;
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file_set_error();
#endif
return 0;
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}
#else /* linux || __FreeBSD__ */
/* retrieve the thread x86 debug registers */
static int get_thread_debug_regs( struct thread *thread, CONTEXT *context )
{
return 0;
}
/* set the thread x86 debug registers */
static int set_thread_debug_regs( struct thread *thread, const CONTEXT *context )
{
return 0;
}
#endif /* linux || __FreeBSD__ */
/* copy a context structure according to the flags */
static void copy_context( CONTEXT *to, const CONTEXT *from, unsigned int flags )
{
if (flags & CONTEXT_CONTROL)
{
to->Ebp = from->Ebp;
to->Eip = from->Eip;
to->Esp = from->Esp;
to->SegCs = from->SegCs;
to->SegSs = from->SegSs;
to->EFlags = from->EFlags;
}
if (flags & CONTEXT_INTEGER)
{
to->Eax = from->Eax;
to->Ebx = from->Ebx;
to->Ecx = from->Ecx;
to->Edx = from->Edx;
to->Esi = from->Esi;
to->Edi = from->Edi;
}
if (flags & CONTEXT_SEGMENTS)
{
to->SegDs = from->SegDs;
to->SegEs = from->SegEs;
to->SegFs = from->SegFs;
to->SegGs = from->SegGs;
}
if (flags & CONTEXT_FLOATING_POINT)
{
to->FloatSave = from->FloatSave;
}
if (flags & CONTEXT_DEBUG_REGISTERS)
{
to->Dr0 = from->Dr0;
to->Dr1 = from->Dr1;
to->Dr2 = from->Dr2;
to->Dr3 = from->Dr3;
to->Dr6 = from->Dr6;
to->Dr7 = from->Dr7;
}
to->ContextFlags |= flags;
}
/* retrieve the current instruction pointer of a context */
void *get_context_ip( const CONTEXT *context )
{
return (void *)context->Eip;
}
/* retrieve the thread context */
void get_thread_context( struct thread *thread, CONTEXT *context, unsigned int flags )
{
context->ContextFlags |= CONTEXT_i386;
flags &= ~CONTEXT_i386; /* get rid of CPU id */
if (thread->context) /* thread is inside an exception event or suspended */
copy_context( context, thread->context, flags & ~CONTEXT_DEBUG_REGISTERS );
if ((flags & CONTEXT_DEBUG_REGISTERS) && suspend_for_ptrace( thread ))
{
if (get_thread_debug_regs( thread, context )) context->ContextFlags |= CONTEXT_DEBUG_REGISTERS;
resume_after_ptrace( thread );
}
}
/* set the thread context */
void set_thread_context( struct thread *thread, const CONTEXT *context, unsigned int flags )
{
flags &= ~CONTEXT_i386; /* get rid of CPU id */
if ((flags & CONTEXT_DEBUG_REGISTERS) && suspend_for_ptrace( thread ))
{
if (!set_thread_debug_regs( thread, context )) flags &= ~CONTEXT_DEBUG_REGISTERS;
resume_after_ptrace( thread );
}
if (thread->context) copy_context( thread->context, context, flags );
}
#endif /* __i386__ */