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wine/dlls/kernel32/selector.c

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/*
* Selector manipulation functions
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include "wine/port.h"
#include <string.h>
#include "wine/winbase16.h"
#include "wine/server.h"
#include "wine/debug.h"
#include "kernel_private.h"
#include "toolhelp.h"
WINE_DEFAULT_DEBUG_CHANNEL(selector);
#define LDT_SIZE 8192
/* get the number of selectors needed to cover up to the selector limit */
static inline WORD get_sel_count( WORD sel )
{
return (wine_ldt_copy.limit[sel >> __AHSHIFT] >> 16) + 1;
}
/***********************************************************************
* AllocSelectorArray (KERNEL.206)
*/
WORD WINAPI AllocSelectorArray16( WORD count )
{
WORD i, sel = wine_ldt_alloc_entries( count );
if (sel)
{
LDT_ENTRY entry;
wine_ldt_set_base( &entry, 0 );
wine_ldt_set_limit( &entry, 1 ); /* avoid 0 base and limit */
wine_ldt_set_flags( &entry, WINE_LDT_FLAGS_DATA );
for (i = 0; i < count; i++) wine_ldt_set_entry( sel + (i << __AHSHIFT), &entry );
}
return sel;
}
/***********************************************************************
* AllocSelector (KERNEL.175)
*/
WORD WINAPI AllocSelector16( WORD sel )
{
WORD newsel, count, i;
count = sel ? get_sel_count(sel) : 1;
newsel = wine_ldt_alloc_entries( count );
TRACE("(%04x): returning %04x\n", sel, newsel );
if (!newsel) return 0;
if (!sel) return newsel; /* nothing to copy */
for (i = 0; i < count; i++)
{
LDT_ENTRY entry;
wine_ldt_get_entry( sel + (i << __AHSHIFT), &entry );
wine_ldt_set_entry( newsel + (i << __AHSHIFT), &entry );
}
return newsel;
}
/***********************************************************************
* FreeSelector (KERNEL.176)
*/
WORD WINAPI FreeSelector16( WORD sel )
{
LDT_ENTRY entry;
wine_ldt_get_entry( sel, &entry );
if (wine_ldt_is_empty( &entry )) return sel; /* error */
#ifdef __i386__
/* Check if we are freeing current %fs selector */
if (!((wine_get_fs() ^ sel) & ~3))
WARN("Freeing %%fs selector (%04x), not good.\n", wine_get_fs() );
#endif /* __i386__ */
wine_ldt_free_entries( sel, 1 );
return 0;
}
/***********************************************************************
* SELECTOR_SetEntries
*
* Set the LDT entries for an array of selectors.
*/
static void SELECTOR_SetEntries( WORD sel, const void *base, DWORD size, unsigned char flags )
{
LDT_ENTRY entry;
WORD i, count;
wine_ldt_set_base( &entry, base );
wine_ldt_set_limit( &entry, size - 1 );
wine_ldt_set_flags( &entry, flags );
count = (size + 0xffff) / 0x10000;
for (i = 0; i < count; i++)
{
wine_ldt_set_entry( sel + (i << __AHSHIFT), &entry );
wine_ldt_set_base( &entry, (char*)wine_ldt_get_base(&entry) + 0x10000);
/* yep, Windows sets limit like that, not 64K sel units */
wine_ldt_set_limit( &entry, wine_ldt_get_limit(&entry) - 0x10000 );
}
}
/***********************************************************************
* SELECTOR_AllocBlock
*
* Allocate selectors for a block of linear memory.
*/
WORD SELECTOR_AllocBlock( const void *base, DWORD size, unsigned char flags )
{
WORD sel, count;
if (!size) return 0;
count = (size + 0xffff) / 0x10000;
sel = wine_ldt_alloc_entries( count );
if (sel) SELECTOR_SetEntries( sel, base, size, flags );
return sel;
}
/***********************************************************************
* SELECTOR_FreeBlock
*
* Free a block of selectors.
*/
void SELECTOR_FreeBlock( WORD sel )
{
WORD i, count = get_sel_count( sel );
TRACE("(%04x,%d)\n", sel, count );
for (i = 0; i < count; i++) FreeSelector16( sel + (i << __AHSHIFT) );
}
/***********************************************************************
* SELECTOR_ReallocBlock
*
* Change the size of a block of selectors.
*/
WORD SELECTOR_ReallocBlock( WORD sel, const void *base, DWORD size )
{
LDT_ENTRY entry;
int oldcount, newcount;
if (!size) size = 1;
wine_ldt_get_entry( sel, &entry );
oldcount = (wine_ldt_get_limit(&entry) >> 16) + 1;
newcount = (size + 0xffff) >> 16;
sel = wine_ldt_realloc_entries( sel, oldcount, newcount );
if (sel) SELECTOR_SetEntries( sel, base, size, wine_ldt_get_flags(&entry) );
return sel;
}
/***********************************************************************
* PrestoChangoSelector (KERNEL.177)
*/
WORD WINAPI PrestoChangoSelector16( WORD selSrc, WORD selDst )
{
LDT_ENTRY entry;
wine_ldt_get_entry( selSrc, &entry );
/* toggle the executable bit */
entry.HighWord.Bits.Type ^= (WINE_LDT_FLAGS_CODE ^ WINE_LDT_FLAGS_DATA);
wine_ldt_set_entry( selDst, &entry );
return selDst;
}
/***********************************************************************
* AllocCStoDSAlias (KERNEL.170)
* AllocAlias (KERNEL.172)
*/
WORD WINAPI AllocCStoDSAlias16( WORD sel )
{
WORD newsel;
LDT_ENTRY entry;
newsel = wine_ldt_alloc_entries( 1 );
TRACE("(%04x): returning %04x\n",
sel, newsel );
if (!newsel) return 0;
wine_ldt_get_entry( sel, &entry );
entry.HighWord.Bits.Type = WINE_LDT_FLAGS_DATA;
wine_ldt_set_entry( newsel, &entry );
return newsel;
}
/***********************************************************************
* AllocDStoCSAlias (KERNEL.171)
*/
WORD WINAPI AllocDStoCSAlias16( WORD sel )
{
WORD newsel;
LDT_ENTRY entry;
newsel = wine_ldt_alloc_entries( 1 );
TRACE("(%04x): returning %04x\n",
sel, newsel );
if (!newsel) return 0;
wine_ldt_get_entry( sel, &entry );
entry.HighWord.Bits.Type = WINE_LDT_FLAGS_CODE;
wine_ldt_set_entry( newsel, &entry );
return newsel;
}
/***********************************************************************
* LongPtrAdd (KERNEL.180)
*/
void WINAPI LongPtrAdd16( DWORD ptr, DWORD add )
{
LDT_ENTRY entry;
wine_ldt_get_entry( SELECTOROF(ptr), &entry );
wine_ldt_set_base( &entry, (char *)wine_ldt_get_base(&entry) + add );
wine_ldt_set_entry( SELECTOROF(ptr), &entry );
}
/***********************************************************************
* GetSelectorBase (KERNEL.186)
*/
DWORD WINAPI GetSelectorBase( WORD sel )
{
void *base = wine_ldt_copy.base[sel >> __AHSHIFT];
/* if base points into DOSMEM, assume we have to
* return pointer into physical lower 1MB */
return DOSMEM_MapLinearToDos( base );
}
/***********************************************************************
* SetSelectorBase (KERNEL.187)
*/
WORD WINAPI SetSelectorBase( WORD sel, DWORD base )
{
LDT_ENTRY entry;
wine_ldt_get_entry( sel, &entry );
wine_ldt_set_base( &entry, DOSMEM_MapDosToLinear(base) );
wine_ldt_set_entry( sel, &entry );
return sel;
}
/***********************************************************************
* GetSelectorLimit (KERNEL.188)
*/
DWORD WINAPI GetSelectorLimit16( WORD sel )
{
return wine_ldt_copy.limit[sel >> __AHSHIFT];
}
/***********************************************************************
* SetSelectorLimit (KERNEL.189)
*/
WORD WINAPI SetSelectorLimit16( WORD sel, DWORD limit )
{
LDT_ENTRY entry;
wine_ldt_get_entry( sel, &entry );
wine_ldt_set_limit( &entry, limit );
wine_ldt_set_entry( sel, &entry );
return sel;
}
/***********************************************************************
* SelectorAccessRights (KERNEL.196)
*/
WORD WINAPI SelectorAccessRights16( WORD sel, WORD op, WORD val )
{
LDT_ENTRY entry;
wine_ldt_get_entry( sel, &entry );
if (op == 0) /* get */
{
return entry.HighWord.Bytes.Flags1 | ((entry.HighWord.Bytes.Flags2 << 8) & 0xf0);
}
else /* set */
{
entry.HighWord.Bytes.Flags1 = LOBYTE(val) | 0xf0;
entry.HighWord.Bytes.Flags2 = (entry.HighWord.Bytes.Flags2 & 0x0f) | (HIBYTE(val) & 0xf0);
wine_ldt_set_entry( sel, &entry );
return 0;
}
}
/***********************************************************************
* IsBadCodePtr (KERNEL.336)
*/
BOOL16 WINAPI IsBadCodePtr16( SEGPTR lpfn )
{
WORD sel;
LDT_ENTRY entry;
sel = SELECTOROF(lpfn);
if (!sel) return TRUE;
wine_ldt_get_entry( sel, &entry );
if (wine_ldt_is_empty( &entry )) return TRUE;
/* check for code segment, ignoring conforming, read-only and accessed bits */
if ((entry.HighWord.Bits.Type ^ WINE_LDT_FLAGS_CODE) & 0x18) return TRUE;
if (OFFSETOF(lpfn) > wine_ldt_get_limit(&entry)) return TRUE;
return FALSE;
}
/***********************************************************************
* IsBadStringPtr (KERNEL.337)
*/
BOOL16 WINAPI IsBadStringPtr16( SEGPTR ptr, UINT16 size )
{
WORD sel;
LDT_ENTRY entry;
sel = SELECTOROF(ptr);
if (!sel) return TRUE;
wine_ldt_get_entry( sel, &entry );
if (wine_ldt_is_empty( &entry )) return TRUE;
/* check for data or readable code segment */
if (!(entry.HighWord.Bits.Type & 0x10)) return TRUE; /* system descriptor */
if ((entry.HighWord.Bits.Type & 0x0a) == 0x08) return TRUE; /* non-readable code segment */
if (strlen(MapSL(ptr)) < size) size = strlen(MapSL(ptr)) + 1;
if (size && (OFFSETOF(ptr) + size - 1 > wine_ldt_get_limit(&entry))) return TRUE;
return FALSE;
}
/***********************************************************************
* IsBadHugeReadPtr (KERNEL.346)
*/
BOOL16 WINAPI IsBadHugeReadPtr16( SEGPTR ptr, DWORD size )
{
WORD sel;
LDT_ENTRY entry;
sel = SELECTOROF(ptr);
if (!sel) return TRUE;
wine_ldt_get_entry( sel, &entry );
if (wine_ldt_is_empty( &entry )) return TRUE;
/* check for data or readable code segment */
if (!(entry.HighWord.Bits.Type & 0x10)) return TRUE; /* system descriptor */
if ((entry.HighWord.Bits.Type & 0x0a) == 0x08) return TRUE; /* non-readable code segment */
if (size && (OFFSETOF(ptr) + size - 1 > wine_ldt_get_limit( &entry ))) return TRUE;
return FALSE;
}
/***********************************************************************
* IsBadHugeWritePtr (KERNEL.347)
*/
BOOL16 WINAPI IsBadHugeWritePtr16( SEGPTR ptr, DWORD size )
{
WORD sel;
LDT_ENTRY entry;
sel = SELECTOROF(ptr);
if (!sel) return TRUE;
wine_ldt_get_entry( sel, &entry );
if (wine_ldt_is_empty( &entry )) return TRUE;
/* check for writable data segment, ignoring expand-down and accessed flags */
if ((entry.HighWord.Bits.Type ^ WINE_LDT_FLAGS_DATA) & ~5) return TRUE;
if (size && (OFFSETOF(ptr) + size - 1 > wine_ldt_get_limit( &entry ))) return TRUE;
return FALSE;
}
/***********************************************************************
* IsBadReadPtr (KERNEL.334)
*/
BOOL16 WINAPI IsBadReadPtr16( SEGPTR ptr, UINT16 size )
{
return IsBadHugeReadPtr16( ptr, size );
}
/***********************************************************************
* IsBadWritePtr (KERNEL.335)
*/
BOOL16 WINAPI IsBadWritePtr16( SEGPTR ptr, UINT16 size )
{
return IsBadHugeWritePtr16( ptr, size );
}
/***********************************************************************
* IsBadFlatReadWritePtr (KERNEL.627)
*/
BOOL16 WINAPI IsBadFlatReadWritePtr16( SEGPTR ptr, DWORD size, BOOL16 bWrite )
{
return bWrite? IsBadHugeWritePtr16( ptr, size )
: IsBadHugeReadPtr16( ptr, size );
}
/***********************************************************************
* MemoryRead (TOOLHELP.78)
*/
DWORD WINAPI MemoryRead16( WORD sel, DWORD offset, void *buffer, DWORD count )
{
LDT_ENTRY entry;
DWORD limit;
wine_ldt_get_entry( sel, &entry );
if (wine_ldt_is_empty( &entry )) return 0;
limit = wine_ldt_get_limit( &entry );
if (offset > limit) return 0;
if (offset + count > limit + 1) count = limit + 1 - offset;
memcpy( buffer, (char *)wine_ldt_get_base(&entry) + offset, count );
return count;
}
/***********************************************************************
* MemoryWrite (TOOLHELP.79)
*/
DWORD WINAPI MemoryWrite16( WORD sel, DWORD offset, void *buffer, DWORD count )
{
LDT_ENTRY entry;
DWORD limit;
wine_ldt_get_entry( sel, &entry );
if (wine_ldt_is_empty( &entry )) return 0;
limit = wine_ldt_get_limit( &entry );
if (offset > limit) return 0;
if (offset + count > limit) count = limit + 1 - offset;
memcpy( (char *)wine_ldt_get_base(&entry) + offset, buffer, count );
return count;
}
/************************************* Win95 pointer mapping functions *
*
*/
struct mapls_entry
{
struct mapls_entry *next;
void *addr; /* linear address */
int count; /* ref count */
WORD sel; /* selector */
};
static struct mapls_entry *first_entry;
/***********************************************************************
* MapLS (KERNEL32.@)
* MapLS (KERNEL.358)
*
* Maps linear pointer to segmented.
*/
SEGPTR WINAPI MapLS( LPCVOID ptr )
{
struct mapls_entry *entry, *free = NULL;
const void *base;
SEGPTR ret = 0;
if (!HIWORD(ptr)) return (SEGPTR)LOWORD(ptr);
base = (const char *)ptr - ((ULONG_PTR)ptr & 0x7fff);
HeapLock( GetProcessHeap() );
for (entry = first_entry; entry; entry = entry->next)
{
if (entry->addr == base) break;
if (!entry->count) free = entry;
}
if (!entry)
{
if (!free) /* no free entry found, create a new one */
{
if (!(free = HeapAlloc( GetProcessHeap(), 0, sizeof(*free) ))) goto done;
if (!(free->sel = SELECTOR_AllocBlock( base, 0x10000, WINE_LDT_FLAGS_DATA )))
{
HeapFree( GetProcessHeap(), 0, free );
goto done;
}
free->count = 0;
free->next = first_entry;
first_entry = free;
}
SetSelectorBase( free->sel, (DWORD)base );
free->addr = (void*)base;
entry = free;
}
entry->count++;
ret = MAKESEGPTR( entry->sel, (const char *)ptr - (char *)entry->addr );
done:
HeapUnlock( GetProcessHeap() );
return ret;
}
/***********************************************************************
* UnMapLS (KERNEL32.@)
* UnMapLS (KERNEL.359)
*
* Free mapped selector.
*/
void WINAPI UnMapLS( SEGPTR sptr )
{
struct mapls_entry *entry;
WORD sel = SELECTOROF(sptr);
if (sel)
{
HeapLock( GetProcessHeap() );
for (entry = first_entry; entry; entry = entry->next) if (entry->sel == sel) break;
if (entry && entry->count > 0) entry->count--;
HeapUnlock( GetProcessHeap() );
}
}
/***********************************************************************
* MapSL (KERNEL32.@)
* MapSL (KERNEL.357)
*
* Maps fixed segmented pointer to linear.
*/
LPVOID WINAPI MapSL( SEGPTR sptr )
{
return (char *)wine_ldt_copy.base[SELECTOROF(sptr) >> __AHSHIFT] + OFFSETOF(sptr);
}
/***********************************************************************
* MapSLFix (KERNEL32.@)
*
* FIXME: MapSLFix and UnMapSLFixArray should probably prevent
* unexpected linear address change when GlobalCompact() shuffles
* moveable blocks.
*/
LPVOID WINAPI MapSLFix( SEGPTR sptr )
{
return MapSL(sptr);
}
/***********************************************************************
* UnMapSLFixArray (KERNEL32.@)
*
* Must not change EAX, hence defined as asm function.
*/
#ifdef __i386__
__ASM_STDCALL_FUNC( UnMapSLFixArray, 8, "ret $8" )
#endif
/***********************************************************************
* GetThreadSelectorEntry (KERNEL32.@)
*/
BOOL WINAPI GetThreadSelectorEntry( HANDLE hthread, DWORD sel, LPLDT_ENTRY ldtent )
{
THREAD_DESCRIPTOR_INFORMATION tdi;
NTSTATUS status;
tdi.Selector = sel;
status = NtQueryInformationThread( hthread, ThreadDescriptorTableEntry,
&tdi, sizeof(tdi), NULL);
if (status)
{
SetLastError( RtlNtStatusToDosError(status) );
return FALSE;
}
*ldtent = tdi.Entry;
return TRUE;
}
#ifdef __i386__
/***********************************************************************
* SMapLS (KERNEL32.@)
*/
__ASM_STDCALL_FUNC( SMapLS, 0,
"xor %edx,%edx\n\t"
"testl $0xffff0000,%eax\n\t"
"jz 1f\n\t"
"pushl %eax\n\t"
"call " __ASM_NAME("MapLS") __ASM_STDCALL(4) "\n\t"
"movl %eax,%edx\n"
"1:\tret" )
/***********************************************************************
* SUnMapLS (KERNEL32.@)
*/
__ASM_STDCALL_FUNC( SUnMapLS, 0,
"pushl %eax\n\t" /* preserve eax */
"pushl %eax\n\t"
"call " __ASM_NAME("UnMapLS") __ASM_STDCALL(4) "\n\t"
"popl %eax\n\t"
"ret" )
/***********************************************************************
* SMapLS_IP_EBP_8 (KERNEL32.@)
* SMapLS_IP_EBP_12 (KERNEL32.@)
* SMapLS_IP_EBP_16 (KERNEL32.@)
* SMapLS_IP_EBP_20 (KERNEL32.@)
* SMapLS_IP_EBP_24 (KERNEL32.@)
* SMapLS_IP_EBP_28 (KERNEL32.@)
* SMapLS_IP_EBP_32 (KERNEL32.@)
* SMapLS_IP_EBP_36 (KERNEL32.@)
* SMapLS_IP_EBP_40 (KERNEL32.@)
*
* These functions map linear pointers at [EBP+xxx] to segmented pointers
* and return them.
* Win95 uses some kind of alias structs, which it stores in [EBP+x] to
* unravel them at SUnMapLS. We just store the segmented pointer there.
*/
#define DEFINE_SMapLS(n) \
__ASM_STDCALL_FUNC( SMapLS_IP_EBP_ ## n, 0, \
"movl " #n "(%ebp),%eax\n\t" \
"call " __ASM_NAME("SMapLS") __ASM_STDCALL(4) "\n\t" \
"movl %edx," #n "(%ebp)\n\t" \
"ret" )
DEFINE_SMapLS(8)
DEFINE_SMapLS(12)
DEFINE_SMapLS(16)
DEFINE_SMapLS(20)
DEFINE_SMapLS(24)
DEFINE_SMapLS(28)
DEFINE_SMapLS(32)
DEFINE_SMapLS(36)
DEFINE_SMapLS(40)
/***********************************************************************
* SUnMapLS_IP_EBP_8 (KERNEL32.@)
* SUnMapLS_IP_EBP_12 (KERNEL32.@)
* SUnMapLS_IP_EBP_16 (KERNEL32.@)
* SUnMapLS_IP_EBP_20 (KERNEL32.@)
* SUnMapLS_IP_EBP_24 (KERNEL32.@)
* SUnMapLS_IP_EBP_28 (KERNEL32.@)
* SUnMapLS_IP_EBP_32 (KERNEL32.@)
* SUnMapLS_IP_EBP_36 (KERNEL32.@)
* SUnMapLS_IP_EBP_40 (KERNEL32.@)
*/
#define DEFINE_SUnMapLS(n) \
__ASM_STDCALL_FUNC( SUnMapLS_IP_EBP_ ## n, 0, \
"pushl %eax\n\t" /* preserve eax */ \
"pushl " #n "(%ebp)\n\t" \
"call " __ASM_NAME("UnMapLS") __ASM_STDCALL(4) "\n\t" \
"movl $0," #n "(%ebp)\n\t" \
"popl %eax\n\t" \
"ret" )
DEFINE_SUnMapLS(8)
DEFINE_SUnMapLS(12)
DEFINE_SUnMapLS(16)
DEFINE_SUnMapLS(20)
DEFINE_SUnMapLS(24)
DEFINE_SUnMapLS(28)
DEFINE_SUnMapLS(32)
DEFINE_SUnMapLS(36)
DEFINE_SUnMapLS(40)
#endif /* __i386__ */
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