mirror of
https://github.com/reactos/wine.git
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210 lines
6.6 KiB
C
210 lines
6.6 KiB
C
/*
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* LDT manipulation functions
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*
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* Copyright 1993 Robert J. Amstadt
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* Copyright 1995 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include "winbase.h"
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#include "wine/library.h"
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#ifdef __i386__
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#ifdef linux
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#ifdef HAVE_SYS_SYSCALL_H
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# include <sys/syscall.h>
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#endif
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struct modify_ldt_s
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{
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unsigned int entry_number;
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unsigned long base_addr;
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unsigned int limit;
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unsigned int seg_32bit : 1;
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unsigned int contents : 2;
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unsigned int read_exec_only : 1;
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unsigned int limit_in_pages : 1;
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unsigned int seg_not_present : 1;
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unsigned int useable:1;
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};
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static inline int modify_ldt( int func, struct modify_ldt_s *ptr,
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unsigned long count )
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{
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int res;
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#ifdef __PIC__
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__asm__ __volatile__( "pushl %%ebx\n\t"
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"movl %2,%%ebx\n\t"
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"int $0x80\n\t"
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"popl %%ebx"
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: "=a" (res)
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: "0" (SYS_modify_ldt),
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"r" (func),
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"c" (ptr),
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"d" (count) );
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#else
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__asm__ __volatile__("int $0x80"
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: "=a" (res)
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: "0" (SYS_modify_ldt),
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"b" (func),
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"c" (ptr),
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"d" (count) );
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#endif /* __PIC__ */
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if (res >= 0) return res;
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errno = -res;
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return -1;
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}
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#endif /* linux */
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#if defined(__svr4__) || defined(_SCO_DS)
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#include <sys/sysi86.h>
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extern int sysi86(int,void*);
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#ifndef __sun__
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#include <sys/seg.h>
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#endif
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#endif
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#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
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#include <machine/segments.h>
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extern int i386_get_ldt(int, union descriptor *, int);
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extern int i386_set_ldt(int, union descriptor *, int);
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#endif /* __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
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#endif /* __i386__ */
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/* local copy of the LDT */
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struct __wine_ldt_copy wine_ldt_copy;
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/***********************************************************************
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* ldt_get_entry
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*
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* Retrieve an LDT entry.
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*/
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void wine_ldt_get_entry( unsigned short sel, LDT_ENTRY *entry )
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{
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int index = sel >> 3;
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wine_ldt_set_base( entry, wine_ldt_copy.base[index] );
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wine_ldt_set_limit( entry, wine_ldt_copy.limit[index] );
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wine_ldt_set_flags( entry, wine_ldt_copy.flags[index] );
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}
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/***********************************************************************
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* ldt_set_entry
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*
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* Set an LDT entry.
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*/
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int wine_ldt_set_entry( unsigned short sel, const LDT_ENTRY *entry )
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{
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int ret = 0, index = sel >> 3;
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/* Entry 0 must not be modified; its base and limit are always 0 */
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if (!index) return 0;
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#ifdef __i386__
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#ifdef linux
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{
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struct modify_ldt_s ldt_info;
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ldt_info.entry_number = index;
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ldt_info.base_addr = (unsigned long)wine_ldt_get_base(entry);
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ldt_info.limit = entry->LimitLow | (entry->HighWord.Bits.LimitHi << 16);
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ldt_info.seg_32bit = entry->HighWord.Bits.Default_Big;
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ldt_info.contents = (entry->HighWord.Bits.Type >> 2) & 3;
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ldt_info.read_exec_only = !(entry->HighWord.Bits.Type & 2);
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ldt_info.limit_in_pages = entry->HighWord.Bits.Granularity;
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ldt_info.seg_not_present = !entry->HighWord.Bits.Pres;
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ldt_info.useable = entry->HighWord.Bits.Sys;
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if ((ret = modify_ldt(0x11, &ldt_info, sizeof(ldt_info))) < 0)
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perror( "modify_ldt" );
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}
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#endif /* linux */
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#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
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{
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LDT_ENTRY entry_copy = *entry;
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/* The kernel will only let us set LDTs with user priority level */
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if (entry_copy.HighWord.Bits.Pres
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&& entry_copy.HighWord.Bits.Dpl != 3)
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entry_copy.HighWord.Bits.Dpl = 3;
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ret = i386_set_ldt(index, (union descriptor *)&entry_copy, 1);
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if (ret < 0)
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{
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perror("i386_set_ldt");
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fprintf( stderr, "Did you reconfigure the kernel with \"options USER_LDT\"?\n" );
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exit(1);
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}
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}
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#endif /* __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
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#if defined(__svr4__) || defined(_SCO_DS)
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{
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struct ssd ldt_mod;
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ldt_mod.sel = sel;
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ldt_mod.bo = (unsigned long)wine_ldt_get_base(entry);
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ldt_mod.ls = entry->LimitLow | (entry->HighWord.Bits.LimitHi << 16);
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ldt_mod.acc1 = entry->HighWord.Bytes.Flags1;
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ldt_mod.acc2 = entry->HighWord.Bytes.Flags2 >> 4;
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if ((ret = sysi86(SI86DSCR, &ldt_mod)) == -1) perror("sysi86");
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}
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#endif
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#endif /* __i386__ */
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if (ret >= 0)
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{
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wine_ldt_copy.base[index] = wine_ldt_get_base(entry);
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wine_ldt_copy.limit[index] = wine_ldt_get_limit(entry);
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wine_ldt_copy.flags[index] = (entry->HighWord.Bits.Type |
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(entry->HighWord.Bits.Default_Big ? WINE_LDT_FLAGS_32BIT : 0) |
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(wine_ldt_copy.flags[index] & WINE_LDT_FLAGS_ALLOCATED));
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}
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return ret;
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}
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/***********************************************************************
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* selector access functions
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*/
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#ifdef __i386__
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# ifndef _MSC_VER
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/* Nothing needs to be done for MS C, it will do with inline versions from the winnt.h */
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__ASM_GLOBAL_FUNC( wine_get_cs, "movw %cs,%ax\n\tret" )
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__ASM_GLOBAL_FUNC( wine_get_ds, "movw %ds,%ax\n\tret" )
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__ASM_GLOBAL_FUNC( wine_get_es, "movw %es,%ax\n\tret" )
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__ASM_GLOBAL_FUNC( wine_get_fs, "movw %fs,%ax\n\tret" )
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__ASM_GLOBAL_FUNC( wine_get_gs, "movw %gs,%ax\n\tret" )
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__ASM_GLOBAL_FUNC( wine_get_ss, "movw %ss,%ax\n\tret" )
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__ASM_GLOBAL_FUNC( wine_set_fs, "movl 4(%esp),%eax\n\tmovw %ax,%fs\n\tret" )
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__ASM_GLOBAL_FUNC( wine_set_gs, "movl 4(%esp),%eax\n\tmovw %ax,%gs\n\tret" )
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# endif /* defined(_MSC_VER) */
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#endif /* defined(__i386__) */
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