506 lines
15 KiB
C
506 lines
15 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 <assert.h>
|
|
#include <stdlib.h>
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
|
|
#include "windef.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;
|
|
unsigned int garbage : 25;
|
|
};
|
|
|
|
static inline void fill_modify_ldt_struct( struct modify_ldt_s *ptr, const LDT_ENTRY *entry )
|
|
{
|
|
ptr->base_addr = (unsigned long)wine_ldt_get_base(entry);
|
|
ptr->limit = entry->LimitLow | (entry->HighWord.Bits.LimitHi << 16);
|
|
ptr->seg_32bit = entry->HighWord.Bits.Default_Big;
|
|
ptr->contents = (entry->HighWord.Bits.Type >> 2) & 3;
|
|
ptr->read_exec_only = !(entry->HighWord.Bits.Type & 2);
|
|
ptr->limit_in_pages = entry->HighWord.Bits.Granularity;
|
|
ptr->seg_not_present = !entry->HighWord.Bits.Pres;
|
|
ptr->useable = entry->HighWord.Bits.Sys;
|
|
ptr->garbage = 0;
|
|
}
|
|
|
|
static inline int modify_ldt( int func, struct modify_ldt_s *ptr, unsigned long count )
|
|
{
|
|
int res;
|
|
__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) );
|
|
if (res >= 0) return res;
|
|
errno = -res;
|
|
return -1;
|
|
}
|
|
|
|
static inline int set_thread_area( struct modify_ldt_s *ptr )
|
|
{
|
|
int res;
|
|
__asm__ __volatile__( "pushl %%ebx\n\t"
|
|
"movl %2,%%ebx\n\t"
|
|
"int $0x80\n\t"
|
|
"popl %%ebx"
|
|
: "=a" (res)
|
|
: "0" (243) /* SYS_set_thread_area */, "q" (ptr) );
|
|
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__ */
|
|
|
|
#ifdef __APPLE__
|
|
|
|
static inline int thread_set_user_ldt( const void *addr, unsigned int size, unsigned int flags )
|
|
{
|
|
int ret;
|
|
__asm__ __volatile__ ("pushl %4\n\t"
|
|
"pushl %3\n\t"
|
|
"pushl %2\n\t"
|
|
"pushl $0\n\t"
|
|
"lcall $0x3b,$0\n\t"
|
|
"leal 16(%%esp),%%esp"
|
|
: "=a" (ret)
|
|
: "0" (4 /*thread_set_user_ldt*/), "r" (addr), "r" (size), "r" (flags) );
|
|
return ret;
|
|
}
|
|
|
|
#endif /* __APPLE__ */
|
|
|
|
#endif /* __i386__ */
|
|
|
|
/* local copy of the LDT */
|
|
#ifdef __APPLE__
|
|
struct __wine_ldt_copy wine_ldt_copy = { { 0, 0, 0 } };
|
|
#else
|
|
struct __wine_ldt_copy wine_ldt_copy;
|
|
#endif
|
|
|
|
static const LDT_ENTRY null_entry; /* all-zeros, used to clear LDT entries */
|
|
|
|
#define LDT_FIRST_ENTRY 512
|
|
#define LDT_SIZE 8192
|
|
|
|
/* empty function for default locks */
|
|
static void nop(void) { }
|
|
|
|
static void (*lock_ldt)(void) = nop;
|
|
static void (*unlock_ldt)(void) = nop;
|
|
|
|
|
|
static inline int is_gdt_sel( unsigned short sel ) { return !(sel & 4); }
|
|
|
|
/***********************************************************************
|
|
* wine_ldt_init_locking
|
|
*
|
|
* Set the LDT locking/unlocking functions.
|
|
*/
|
|
void wine_ldt_init_locking( void (*lock_func)(void), void (*unlock_func)(void) )
|
|
{
|
|
lock_ldt = lock_func;
|
|
unlock_ldt = unlock_func;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* wine_ldt_get_entry
|
|
*
|
|
* Retrieve an LDT entry. Return a null entry if selector is not allocated.
|
|
*/
|
|
void wine_ldt_get_entry( unsigned short sel, LDT_ENTRY *entry )
|
|
{
|
|
int index = sel >> 3;
|
|
|
|
if (is_gdt_sel(sel))
|
|
{
|
|
*entry = null_entry;
|
|
return;
|
|
}
|
|
lock_ldt();
|
|
if (wine_ldt_copy.flags[index] & WINE_LDT_FLAGS_ALLOCATED)
|
|
{
|
|
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] );
|
|
}
|
|
else *entry = null_entry;
|
|
unlock_ldt();
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* internal_set_entry
|
|
*
|
|
* Set an LDT entry, without locking. For internal use only.
|
|
*/
|
|
static int internal_set_entry( unsigned short sel, const LDT_ENTRY *entry )
|
|
{
|
|
int ret = 0, index = sel >> 3;
|
|
|
|
if (index < LDT_FIRST_ENTRY) return 0; /* cannot modify reserved entries */
|
|
|
|
#ifdef __i386__
|
|
|
|
#ifdef linux
|
|
{
|
|
struct modify_ldt_s ldt_info;
|
|
|
|
ldt_info.entry_number = index;
|
|
fill_modify_ldt_struct( &ldt_info, entry );
|
|
if ((ret = modify_ldt(0x11, &ldt_info, sizeof(ldt_info))) < 0)
|
|
perror( "modify_ldt" );
|
|
}
|
|
#elif 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);
|
|
}
|
|
}
|
|
#elif 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");
|
|
}
|
|
#else
|
|
fprintf( stderr, "No LDT support on this platform\n" );
|
|
exit(1);
|
|
#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;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* wine_ldt_set_entry
|
|
*
|
|
* Set an LDT entry.
|
|
*/
|
|
int wine_ldt_set_entry( unsigned short sel, const LDT_ENTRY *entry )
|
|
{
|
|
int ret;
|
|
|
|
lock_ldt();
|
|
ret = internal_set_entry( sel, entry );
|
|
unlock_ldt();
|
|
return ret;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* wine_ldt_is_system
|
|
*
|
|
* Check if the selector is a system selector (i.e. not managed by Wine).
|
|
*/
|
|
int wine_ldt_is_system( unsigned short sel )
|
|
{
|
|
return is_gdt_sel(sel) || ((sel >> 3) < LDT_FIRST_ENTRY);
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* wine_ldt_get_ptr
|
|
*
|
|
* Convert a segment:offset pair to a linear pointer.
|
|
* Note: we don't lock the LDT since this has to be fast.
|
|
*/
|
|
void *wine_ldt_get_ptr( unsigned short sel, unsigned int offset )
|
|
{
|
|
int index;
|
|
|
|
if (is_gdt_sel(sel)) /* GDT selector */
|
|
return (void *)offset;
|
|
if ((index = (sel >> 3)) < LDT_FIRST_ENTRY) /* system selector */
|
|
return (void *)offset;
|
|
if (!(wine_ldt_copy.flags[index] & WINE_LDT_FLAGS_32BIT)) offset &= 0xffff;
|
|
return (char *)wine_ldt_copy.base[index] + offset;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* wine_ldt_alloc_entries
|
|
*
|
|
* Allocate a number of consecutive ldt entries, without setting the LDT contents.
|
|
* Return a selector for the first entry.
|
|
*/
|
|
unsigned short wine_ldt_alloc_entries( int count )
|
|
{
|
|
int i, index, size = 0;
|
|
|
|
if (count <= 0) return 0;
|
|
lock_ldt();
|
|
for (i = LDT_FIRST_ENTRY; i < LDT_SIZE; i++)
|
|
{
|
|
if (wine_ldt_copy.flags[i] & WINE_LDT_FLAGS_ALLOCATED) size = 0;
|
|
else if (++size >= count) /* found a large enough block */
|
|
{
|
|
index = i - size + 1;
|
|
|
|
/* mark selectors as allocated */
|
|
for (i = 0; i < count; i++) wine_ldt_copy.flags[index + i] |= WINE_LDT_FLAGS_ALLOCATED;
|
|
unlock_ldt();
|
|
return (index << 3) | 7;
|
|
}
|
|
}
|
|
unlock_ldt();
|
|
return 0;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* wine_ldt_realloc_entries
|
|
*
|
|
* Reallocate a number of consecutive ldt entries, without changing the LDT contents.
|
|
* Return a selector for the first entry.
|
|
*/
|
|
unsigned short wine_ldt_realloc_entries( unsigned short sel, int oldcount, int newcount )
|
|
{
|
|
int i;
|
|
|
|
if (oldcount < newcount) /* we need to add selectors */
|
|
{
|
|
int index = sel >> 3;
|
|
|
|
lock_ldt();
|
|
/* check if the next selectors are free */
|
|
if (index + newcount > LDT_SIZE) i = oldcount;
|
|
else
|
|
for (i = oldcount; i < newcount; i++)
|
|
if (wine_ldt_copy.flags[index+i] & WINE_LDT_FLAGS_ALLOCATED) break;
|
|
|
|
if (i < newcount) /* they are not free */
|
|
{
|
|
wine_ldt_free_entries( sel, oldcount );
|
|
sel = wine_ldt_alloc_entries( newcount );
|
|
}
|
|
else /* mark the selectors as allocated */
|
|
{
|
|
for (i = oldcount; i < newcount; i++)
|
|
wine_ldt_copy.flags[index+i] |= WINE_LDT_FLAGS_ALLOCATED;
|
|
}
|
|
unlock_ldt();
|
|
}
|
|
else if (oldcount > newcount) /* we need to remove selectors */
|
|
{
|
|
wine_ldt_free_entries( sel + (newcount << 3), newcount - oldcount );
|
|
}
|
|
return sel;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* wine_ldt_free_entries
|
|
*
|
|
* Free a number of consecutive ldt entries and clear their contents.
|
|
*/
|
|
void wine_ldt_free_entries( unsigned short sel, int count )
|
|
{
|
|
int index;
|
|
|
|
lock_ldt();
|
|
for (index = sel >> 3; count > 0; count--, index++)
|
|
{
|
|
internal_set_entry( sel, &null_entry );
|
|
wine_ldt_copy.flags[index] = 0;
|
|
}
|
|
unlock_ldt();
|
|
}
|
|
|
|
|
|
#ifdef __i386__
|
|
|
|
static int global_fs_sel = -1; /* global selector for %fs shared among all threads */
|
|
|
|
/***********************************************************************
|
|
* wine_ldt_alloc_fs
|
|
*
|
|
* Allocate an LDT entry for a %fs selector, reusing a global
|
|
* GDT selector if possible. Return the selector value.
|
|
*/
|
|
unsigned short wine_ldt_alloc_fs(void)
|
|
{
|
|
if (global_fs_sel == -1)
|
|
{
|
|
#ifdef __linux__
|
|
struct modify_ldt_s ldt_info;
|
|
int ret;
|
|
|
|
ldt_info.entry_number = -1;
|
|
fill_modify_ldt_struct( &ldt_info, &null_entry );
|
|
if ((ret = set_thread_area( &ldt_info ) < 0))
|
|
{
|
|
global_fs_sel = 0; /* don't try it again */
|
|
if (errno != ENOSYS) perror( "set_thread_area" );
|
|
}
|
|
else global_fs_sel = (ldt_info.entry_number << 3) | 3;
|
|
#elif defined(__APPLE__)
|
|
int ret = thread_set_user_ldt( NULL, 0, 0 );
|
|
if (ret != -1) global_fs_sel = ret;
|
|
else global_fs_sel = 0;
|
|
#endif /* __APPLE__ */
|
|
}
|
|
if (global_fs_sel > 0) return global_fs_sel;
|
|
return wine_ldt_alloc_entries( 1 );
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* wine_ldt_init_fs
|
|
*
|
|
* Initialize the entry for the %fs selector of the current thread, and
|
|
* set the thread %fs register.
|
|
*
|
|
* Note: this runs in the context of the new thread, so cannot acquire locks.
|
|
*/
|
|
void wine_ldt_init_fs( unsigned short sel, const LDT_ENTRY *entry )
|
|
{
|
|
if ((sel & ~3) == (global_fs_sel & ~3))
|
|
{
|
|
#ifdef __linux__
|
|
struct modify_ldt_s ldt_info;
|
|
int ret;
|
|
|
|
ldt_info.entry_number = sel >> 3;
|
|
fill_modify_ldt_struct( &ldt_info, entry );
|
|
if ((ret = set_thread_area( &ldt_info ) < 0)) perror( "set_thread_area" );
|
|
#elif defined(__APPLE__)
|
|
int ret = thread_set_user_ldt( wine_ldt_get_base(entry), wine_ldt_get_limit(entry), 0 );
|
|
if (ret == -1) perror( "thread_set_user_ldt" );
|
|
else assert( ret == global_fs_sel );
|
|
#endif /* __APPLE__ */
|
|
}
|
|
else /* LDT selector */
|
|
{
|
|
internal_set_entry( sel, entry );
|
|
}
|
|
wine_set_fs( sel );
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* wine_ldt_free_fs
|
|
*
|
|
* Free a %fs selector returned by wine_ldt_alloc_fs.
|
|
*/
|
|
void wine_ldt_free_fs( unsigned short sel )
|
|
{
|
|
if (is_gdt_sel(sel)) return; /* nothing to do */
|
|
if (!((wine_get_fs() ^ sel) & ~3))
|
|
{
|
|
/* FIXME: if freeing current %fs we cannot acquire locks */
|
|
wine_set_fs( 0 );
|
|
internal_set_entry( sel, &null_entry );
|
|
wine_ldt_copy.flags[sel >> 3] = 0;
|
|
}
|
|
else wine_ldt_free_entries( sel, 1 );
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* selector access functions
|
|
*/
|
|
# 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 /* __i386__ */
|