Sweden-Number/library/ldt.c

211 lines
6.6 KiB
C

/*
* LDT manipulation functions
*
* Copyright 1993 Robert J. Amstadt
* Copyright 1995 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"
#include "wine/port.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "winbase.h"
#define WINE_EXPORT_LDT_COPY
#include "wine/library.h"
#ifdef __i386__
#ifdef linux
#ifdef HAVE_SYS_SYSCALL_H
# include <sys/syscall.h>
#endif
struct modify_ldt_s
{
unsigned int entry_number;
unsigned long base_addr;
unsigned int limit;
unsigned int seg_32bit : 1;
unsigned int contents : 2;
unsigned int read_exec_only : 1;
unsigned int limit_in_pages : 1;
unsigned int seg_not_present : 1;
unsigned int useable:1;
};
static inline int modify_ldt( int func, struct modify_ldt_s *ptr,
unsigned long count )
{
int res;
#ifdef __PIC__
__asm__ __volatile__( "pushl %%ebx\n\t"
"movl %2,%%ebx\n\t"
"int $0x80\n\t"
"popl %%ebx"
: "=a" (res)
: "0" (SYS_modify_ldt),
"r" (func),
"c" (ptr),
"d" (count) );
#else
__asm__ __volatile__("int $0x80"
: "=a" (res)
: "0" (SYS_modify_ldt),
"b" (func),
"c" (ptr),
"d" (count) );
#endif /* __PIC__ */
if (res >= 0) return res;
errno = -res;
return -1;
}
#endif /* linux */
#if defined(__svr4__) || defined(_SCO_DS)
#include <sys/sysi86.h>
extern int sysi86(int,void*);
#ifndef __sun__
#include <sys/seg.h>
#endif
#endif
#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
#include <machine/segments.h>
extern int i386_get_ldt(int, union descriptor *, int);
extern int i386_set_ldt(int, union descriptor *, int);
#endif /* __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
#endif /* __i386__ */
/* local copy of the LDT */
struct __wine_ldt_copy wine_ldt_copy;
/***********************************************************************
* ldt_get_entry
*
* Retrieve an LDT entry.
*/
void wine_ldt_get_entry( unsigned short sel, LDT_ENTRY *entry )
{
int index = sel >> 3;
wine_ldt_set_base( entry, wine_ldt_copy.base[index] );
wine_ldt_set_limit( entry, wine_ldt_copy.limit[index] );
wine_ldt_set_flags( entry, wine_ldt_copy.flags[index] );
}
/***********************************************************************
* ldt_set_entry
*
* Set an LDT entry.
*/
int wine_ldt_set_entry( unsigned short sel, const LDT_ENTRY *entry )
{
int ret = 0, index = sel >> 3;
/* Entry 0 must not be modified; its base and limit are always 0 */
if (!index) return 0;
#ifdef __i386__
#ifdef linux
{
struct modify_ldt_s ldt_info;
ldt_info.entry_number = index;
ldt_info.base_addr = (unsigned long)wine_ldt_get_base(entry);
ldt_info.limit = entry->LimitLow | (entry->HighWord.Bits.LimitHi << 16);
ldt_info.seg_32bit = entry->HighWord.Bits.Default_Big;
ldt_info.contents = (entry->HighWord.Bits.Type >> 2) & 3;
ldt_info.read_exec_only = !(entry->HighWord.Bits.Type & 2);
ldt_info.limit_in_pages = entry->HighWord.Bits.Granularity;
ldt_info.seg_not_present = !entry->HighWord.Bits.Pres;
ldt_info.useable = entry->HighWord.Bits.Sys;
if ((ret = modify_ldt(0x11, &ldt_info, sizeof(ldt_info))) < 0)
perror( "modify_ldt" );
}
#endif /* linux */
#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
{
LDT_ENTRY entry_copy = *entry;
/* The kernel will only let us set LDTs with user priority level */
if (entry_copy.HighWord.Bits.Pres
&& entry_copy.HighWord.Bits.Dpl != 3)
entry_copy.HighWord.Bits.Dpl = 3;
ret = i386_set_ldt(index, (union descriptor *)&entry_copy, 1);
if (ret < 0)
{
perror("i386_set_ldt");
fprintf( stderr, "Did you reconfigure the kernel with \"options USER_LDT\"?\n" );
exit(1);
}
}
#endif /* __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
#if defined(__svr4__) || defined(_SCO_DS)
{
struct ssd ldt_mod;
ldt_mod.sel = sel;
ldt_mod.bo = (unsigned long)wine_ldt_get_base(entry);
ldt_mod.ls = entry->LimitLow | (entry->HighWord.Bits.LimitHi << 16);
ldt_mod.acc1 = entry->HighWord.Bytes.Flags1;
ldt_mod.acc2 = entry->HighWord.Bytes.Flags2 >> 4;
if ((ret = sysi86(SI86DSCR, &ldt_mod)) == -1) perror("sysi86");
}
#endif
#endif /* __i386__ */
if (ret >= 0)
{
wine_ldt_copy.base[index] = wine_ldt_get_base(entry);
wine_ldt_copy.limit[index] = wine_ldt_get_limit(entry);
wine_ldt_copy.flags[index] = (entry->HighWord.Bits.Type |
(entry->HighWord.Bits.Default_Big ? WINE_LDT_FLAGS_32BIT : 0) |
(wine_ldt_copy.flags[index] & WINE_LDT_FLAGS_ALLOCATED));
}
return ret;
}
/***********************************************************************
* selector access functions
*/
#ifdef __i386__
# ifndef _MSC_VER
/* Nothing needs to be done for MS C, it will do with inline versions from the winnt.h */
__ASM_GLOBAL_FUNC( wine_get_cs, "movw %cs,%ax\n\tret" )
__ASM_GLOBAL_FUNC( wine_get_ds, "movw %ds,%ax\n\tret" )
__ASM_GLOBAL_FUNC( wine_get_es, "movw %es,%ax\n\tret" )
__ASM_GLOBAL_FUNC( wine_get_fs, "movw %fs,%ax\n\tret" )
__ASM_GLOBAL_FUNC( wine_get_gs, "movw %gs,%ax\n\tret" )
__ASM_GLOBAL_FUNC( wine_get_ss, "movw %ss,%ax\n\tret" )
__ASM_GLOBAL_FUNC( wine_set_fs, "movl 4(%esp),%eax\n\tmovw %ax,%fs\n\tret" )
__ASM_GLOBAL_FUNC( wine_set_gs, "movl 4(%esp),%eax\n\tmovw %ax,%gs\n\tret" )
# endif /* defined(_MSC_VER) */
#endif /* defined(__i386__) */