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Sweden-Number/memory/selector.c

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/*
* Selector manipulation functions
*
* Copyright 1995 Alexandre Julliard
*/
#include <string.h>
#include "windows.h"
#include "ldt.h"
#include "miscemu.h"
#include "selectors.h"
#include "stackframe.h"
#include "stddebug.h"
#include "debug.h"
#define FIRST_LDT_ENTRY_TO_ALLOC 17
/***********************************************************************
* AllocSelectorArray (KERNEL.206)
*/
WORD WINAPI AllocSelectorArray( WORD count )
{
WORD i, size = 0;
if (!count) return 0;
for (i = FIRST_LDT_ENTRY_TO_ALLOC; i < LDT_SIZE; i++)
{
if (!IS_LDT_ENTRY_FREE(i)) size = 0;
else if (++size >= count) break;
}
if (i == LDT_SIZE) return 0;
/* Mark selector as allocated */
while (size--) ldt_flags_copy[i--] |= LDT_FLAGS_ALLOCATED;
return ENTRY_TO_SELECTOR( i + 1 );
}
/***********************************************************************
* AllocSelector (KERNEL.175)
*/
WORD WINAPI AllocSelector( WORD sel )
{
WORD newsel, count, i;
count = sel ? ((GET_SEL_LIMIT(sel) >> 16) + 1) : 1;
newsel = AllocSelectorArray( count );
dprintf_selector( stddeb, "AllocSelector(%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;
LDT_GetEntry( SELECTOR_TO_ENTRY(sel) + i, &entry );
LDT_SetEntry( SELECTOR_TO_ENTRY(newsel) + i, &entry );
}
return newsel;
}
/***********************************************************************
* FreeSelector (KERNEL.176)
*/
WORD WINAPI FreeSelector( WORD sel )
{
if (IS_SELECTOR_FREE(sel)) return sel; /* error */
SELECTOR_FreeBlock( 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,
enum seg_type type, BOOL32 is32bit,
BOOL32 readonly )
{
ldt_entry entry;
WORD i, count;
/* The limit for the first selector is the whole */
/* block. The next selectors get a 64k limit. */
entry.base = (unsigned long)base;
entry.type = type;
entry.seg_32bit = is32bit;
entry.read_only = readonly;
entry.limit_in_pages = (size > 0x100000);
if (entry.limit_in_pages) entry.limit = ((size + 0xfff) >> 12) - 1;
else entry.limit = size - 1;
/* Make sure base and limit are not 0 together if the size is not 0 */
if (!base && !entry.limit && size) entry.limit = 1;
count = (size + 0xffff) / 0x10000;
for (i = 0; i < count; i++)
{
LDT_SetEntry( SELECTOR_TO_ENTRY(sel) + i, &entry );
entry.base += 0x10000;
/* Apparently the next selectors should *not* get a 64k limit. */
/* Can't remember where I read they should... --AJ */
entry.limit -= entry.limit_in_pages ? 0x10 : 0x10000;
}
}
/***********************************************************************
* SELECTOR_AllocBlock
*
* Allocate selectors for a block of linear memory.
*/
WORD SELECTOR_AllocBlock( const void *base, DWORD size, enum seg_type type,
BOOL32 is32bit, BOOL32 readonly )
{
WORD sel, count;
if (!size) return 0;
count = (size + 0xffff) / 0x10000;
sel = AllocSelectorArray( count );
if (sel) SELECTOR_SetEntries( sel, base, size, type, is32bit, readonly );
return sel;
}
/***********************************************************************
* SELECTOR_FreeBlock
*
* Free a block of selectors.
*/
void SELECTOR_FreeBlock( WORD sel, WORD count )
{
WORD i, nextsel;
ldt_entry entry;
STACK16FRAME *frame;
dprintf_selector( stddeb, "SELECTOR_FreeBlock(%04x,%d)\n", sel, count );
sel &= ~(__AHINCR - 1); /* clear bottom bits of selector */
nextsel = sel + (count << __AHSHIFT);
#ifdef __i386__
{
/* Check if we are freeing current %fs or %gs selector */
WORD fs, gs;
__asm__("movw %%fs,%w0":"=r" (fs));
if ((fs >= sel) && (fs < nextsel))
{
fprintf( stderr, "SELECTOR_FreeBlock: freeing %%fs selector (%04x), not good.\n", fs );
__asm__("movw %w0,%%fs"::"r" (0));
}
__asm__("movw %%gs,%w0":"=r" (gs));
if ((gs >= sel) && (gs < nextsel))
__asm__("movw %w0,%%gs"::"r" (0));
}
#endif /* __i386__ */
memset( &entry, 0, sizeof(entry) ); /* clear the LDT entries */
for (i = SELECTOR_TO_ENTRY(sel); count; i++, count--)
{
LDT_SetEntry( i, &entry );
ldt_flags_copy[i] &= ~LDT_FLAGS_ALLOCATED;
}
/* Clear the saved 16-bit selector */
frame = CURRENT_STACK16;
while (frame)
{
if ((frame->ds >= sel) && (frame->ds < nextsel)) frame->ds = 0;
if ((frame->es >= sel) && (frame->es < nextsel)) frame->es = 0;
frame = PTR_SEG_TO_LIN( frame->saved_ss_sp );
}
}
/***********************************************************************
* SELECTOR_ReallocBlock
*
* Change the size of a block of selectors.
*/
WORD SELECTOR_ReallocBlock( WORD sel, const void *base, DWORD size,
enum seg_type type, BOOL32 is32bit, BOOL32 readonly)
{
WORD i, oldcount, newcount;
if (!size) size = 1;
oldcount = (GET_SEL_LIMIT(sel) >> 16) + 1;
newcount = (size + 0xffff) >> 16;
if (oldcount < newcount) /* We need to add selectors */
{
/* Check if the next selectors are free */
if (SELECTOR_TO_ENTRY(sel) + newcount > LDT_SIZE) i = oldcount;
else
for (i = oldcount; i < newcount; i++)
if (!IS_LDT_ENTRY_FREE(SELECTOR_TO_ENTRY(sel)+i)) break;
if (i < newcount) /* they are not free */
{
SELECTOR_FreeBlock( sel, oldcount );
sel = AllocSelectorArray( newcount );
}
else /* mark the selectors as allocated */
{
for (i = oldcount; i < newcount; i++)
ldt_flags_copy[SELECTOR_TO_ENTRY(sel)+i] |=LDT_FLAGS_ALLOCATED;
}
}
else if (oldcount > newcount) /* We need to remove selectors */
{
SELECTOR_FreeBlock( ENTRY_TO_SELECTOR(SELECTOR_TO_ENTRY(sel)+newcount),
oldcount - newcount );
}
if (sel) SELECTOR_SetEntries( sel, base, size, type, is32bit, readonly );
return sel;
}
/***********************************************************************
* PrestoChangoSelector (KERNEL.177)
*/
WORD WINAPI PrestoChangoSelector( WORD selSrc, WORD selDst )
{
ldt_entry entry;
LDT_GetEntry( SELECTOR_TO_ENTRY( selSrc ), &entry );
entry.type ^= SEGMENT_CODE; /* toggle the executable bit */
LDT_SetEntry( SELECTOR_TO_ENTRY( selDst ), &entry );
return selDst;
}
/***********************************************************************
* AllocCStoDSAlias (KERNEL.170)
*/
WORD WINAPI AllocCStoDSAlias( WORD sel )
{
WORD newsel;
ldt_entry entry;
newsel = AllocSelectorArray( 1 );
dprintf_selector( stddeb, "AllocCStoDSAlias(%04x): returning %04x\n",
sel, newsel );
if (!newsel) return 0;
LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
entry.type = SEGMENT_DATA;
LDT_SetEntry( SELECTOR_TO_ENTRY(newsel), &entry );
return newsel;
}
/***********************************************************************
* AllocDStoCSAlias (KERNEL.171)
*/
WORD WINAPI AllocDStoCSAlias( WORD sel )
{
WORD newsel;
ldt_entry entry;
newsel = AllocSelectorArray( 1 );
dprintf_selector( stddeb, "AllocDStoCSAlias(%04x): returning %04x\n",
sel, newsel );
if (!newsel) return 0;
LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
entry.type = SEGMENT_CODE;
LDT_SetEntry( SELECTOR_TO_ENTRY(newsel), &entry );
return newsel;
}
/***********************************************************************
* LongPtrAdd (KERNEL.180)
*/
void WINAPI LongPtrAdd( DWORD ptr, DWORD add )
{
ldt_entry entry;
LDT_GetEntry( SELECTOR_TO_ENTRY(SELECTOROF(ptr)), &entry );
entry.base += add;
LDT_SetEntry( SELECTOR_TO_ENTRY(SELECTOROF(ptr)), &entry );
}
/***********************************************************************
* GetSelectorBase (KERNEL.186)
*/
DWORD WINAPI GetSelectorBase( WORD sel )
{
DWORD base = GET_SEL_BASE(sel);
/* if base points into DOSMEM, assume we have to
* return pointer into physical lower 1MB */
return DOSMEM_MapLinearToDos( (LPVOID)base );
}
/***********************************************************************
* SetSelectorBase (KERNEL.187)
*/
WORD WINAPI SetSelectorBase( WORD sel, DWORD base )
{
ldt_entry entry;
LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
entry.base = (DWORD)DOSMEM_MapDosToLinear(base);
LDT_SetEntry( SELECTOR_TO_ENTRY(sel), &entry );
return sel;
}
/***********************************************************************
* GetSelectorLimit (KERNEL.188)
*/
DWORD WINAPI GetSelectorLimit( WORD sel )
{
return GET_SEL_LIMIT(sel);
}
/***********************************************************************
* SetSelectorLimit (KERNEL.189)
*/
WORD WINAPI SetSelectorLimit( WORD sel, DWORD limit )
{
ldt_entry entry;
LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
entry.limit_in_pages = (limit >= 0x100000);
if (entry.limit_in_pages) entry.limit = limit >> 12;
else entry.limit = limit;
LDT_SetEntry( SELECTOR_TO_ENTRY(sel), &entry );
return sel;
}
/***********************************************************************
* SelectorAccessRights (KERNEL.196)
*/
WORD WINAPI SelectorAccessRights( WORD sel, WORD op, WORD val )
{
ldt_entry entry;
LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
if (op == 0) /* get */
{
return 0x01 | /* accessed */
0x10 | /* not system */
0x60 | /* DPL 3 */
0x80 | /* present */
((entry.read_only == 0) << 1) |
(entry.type << 2) |
(entry.seg_32bit << 14) |
(entry.limit_in_pages << 15);
}
else /* set */
{
entry.read_only = ((val & 2) == 0);
entry.type = (val >> 2) & 3;
entry.seg_32bit = val & 0x4000;
entry.limit_in_pages = val & 0x8000;
LDT_SetEntry( SELECTOR_TO_ENTRY(sel), &entry );
return 0;
}
}
/***********************************************************************
* IsBadCodePtr16 (KERNEL.336)
*/
BOOL16 WINAPI IsBadCodePtr16( SEGPTR lpfn )
{
WORD sel;
ldt_entry entry;
sel = SELECTOROF(lpfn);
if (!sel) return TRUE;
if (IS_SELECTOR_FREE(sel)) return TRUE;
LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
if (entry.type != SEGMENT_CODE) return TRUE;
if (OFFSETOF(lpfn) > entry.limit) return TRUE;
return FALSE;
}
/***********************************************************************
* IsBadStringPtr16 (KERNEL.337)
*/
BOOL16 WINAPI IsBadStringPtr16( SEGPTR ptr, UINT16 size )
{
WORD sel;
ldt_entry entry;
sel = SELECTOROF(ptr);
if (!sel) return TRUE;
if (IS_SELECTOR_FREE(sel)) return TRUE;
LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
if ((entry.type == SEGMENT_CODE) && entry.read_only) return TRUE;
if (strlen(PTR_SEG_TO_LIN(ptr)) < size) size = strlen(PTR_SEG_TO_LIN(ptr));
if (OFFSETOF(ptr) + size - 1 > entry.limit) return TRUE;
return FALSE;
}
/***********************************************************************
* IsBadHugeReadPtr16 (KERNEL.346)
*/
BOOL16 WINAPI IsBadHugeReadPtr16( SEGPTR ptr, DWORD size )
{
WORD sel;
ldt_entry entry;
sel = SELECTOROF(ptr);
if (!sel) return TRUE;
if (IS_SELECTOR_FREE(sel)) return TRUE;
LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
if ((entry.type == SEGMENT_CODE) && entry.read_only) return TRUE;
if (OFFSETOF(ptr) + size - 1 > entry.limit) return TRUE;
return FALSE;
}
/***********************************************************************
* IsBadHugeWritePtr16 (KERNEL.347)
*/
BOOL16 WINAPI IsBadHugeWritePtr16( SEGPTR ptr, DWORD size )
{
WORD sel;
ldt_entry entry;
sel = SELECTOROF(ptr);
if (!sel) return TRUE;
if (IS_SELECTOR_FREE(sel)) return TRUE;
LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
if ((entry.type == SEGMENT_CODE) || entry.read_only) return TRUE;
if (OFFSETOF(ptr) + size - 1 > entry.limit) return TRUE;
return FALSE;
}
/***********************************************************************
* IsBadReadPtr16 (KERNEL.334)
*/
BOOL16 WINAPI IsBadReadPtr16( SEGPTR ptr, UINT16 size )
{
return IsBadHugeReadPtr16( ptr, size );
}
/***********************************************************************
* IsBadWritePtr16 (KERNEL.335)
*/
BOOL16 WINAPI IsBadWritePtr16( SEGPTR ptr, UINT16 size )
{
return IsBadHugeWritePtr16( ptr, size );
}
/***********************************************************************
* MemoryRead (TOOLHELP.78)
*/
DWORD WINAPI MemoryRead( WORD sel, DWORD offset, void *buffer, DWORD count )
{
if (IS_SELECTOR_FREE(sel)) return 0;
if (offset > GET_SEL_LIMIT(sel)) return 0;
if (offset + count > GET_SEL_LIMIT(sel) + 1)
count = GET_SEL_LIMIT(sel) + 1 - offset;
memcpy( buffer, ((char *)GET_SEL_BASE(sel)) + offset, count );
return count;
}
/***********************************************************************
* MemoryWrite (TOOLHELP.79)
*/
DWORD WINAPI MemoryWrite( WORD sel, DWORD offset, void *buffer, DWORD count )
{
if (IS_SELECTOR_FREE(sel)) return 0;
if (offset > GET_SEL_LIMIT(sel)) return 0;
if (offset + count > GET_SEL_LIMIT(sel) + 1)
count = GET_SEL_LIMIT(sel) + 1 - offset;
memcpy( ((char *)GET_SEL_BASE(sel)) + offset, buffer, count );
return count;
}
/************************************* Win95 pointer mapping functions *
*
* NOTE: MapSLFix and UnMapSLFixArray are probably needed to prevent
* unexpected linear address change when GlobalCompact() shuffles
* moveable blocks.
*/
/***********************************************************************
* MapSL (KERNEL32.662)
*
* Maps fixed segmented pointer to linear.
*/
LPVOID WINAPI MapSL( SEGPTR sptr )
{
return (LPVOID)PTR_SEG_TO_LIN(sptr);
}
/***********************************************************************
* MapLS (KERNEL32.679)
*
* Maps linear pointer to segmented.
*/
SEGPTR WINAPI MapLS( LPVOID ptr )
{
WORD sel = SELECTOR_AllocBlock( ptr, 0x10000, SEGMENT_DATA, FALSE, FALSE );
return PTR_SEG_OFF_TO_SEGPTR( sel, 0 );
}
/***********************************************************************
* UnMapLS (KERNEL32.680)
*
* Free mapped selector.
*/
void WINAPI UnMapLS( SEGPTR sptr )
{
if (!__winelib) SELECTOR_FreeBlock( SELECTOROF(sptr), 1 );
}
/***********************************************************************
* GetThreadSelectorEntry (KERNEL32)
* FIXME: add #ifdef i386 for non x86
*/
BOOL32 WINAPI GetThreadSelectorEntry( HANDLE32 hthread, DWORD sel,
LPLDT_ENTRY ldtent)
{
ldt_entry ldtentry;
LDT_GetEntry(SELECTOR_TO_ENTRY(sel),&ldtentry);
ldtent->BaseLow = ldtentry.base & 0x0000ffff;
ldtent->HighWord.Bits.BaseMid = (ldtentry.base & 0x00ff0000) >> 16;
ldtent->HighWord.Bits.BaseHi = (ldtentry.base & 0xff000000) >> 24;
ldtent->LimitLow = ldtentry.limit & 0x0000ffff;
ldtent->HighWord.Bits.LimitHi = (ldtentry.limit & 0x00ff0000) >> 16;
ldtent->HighWord.Bits.Dpl = 3;
ldtent->HighWord.Bits.Sys = 0;
ldtent->HighWord.Bits.Pres = 1;
ldtent->HighWord.Bits.Type = 0x10|(ldtentry.type << 2);
if (ldtentry.read_only)
ldtent->HighWord.Bits.Type|=0x2;
ldtent->HighWord.Bits.Granularity = ldtentry.limit_in_pages;
ldtent->HighWord.Bits.Default_Big = ldtentry.seg_32bit;
return TRUE;
}
/**********************************************************************
* SMapLS* (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.
*/
static void
x_SMapLS_IP_EBP_x(CONTEXT *context,int argoff) {
DWORD val,ptr;
val =*(DWORD*)(EBP_reg(context)+argoff);
if (val<0x10000) {
ptr=val;
*(DWORD*)(EBP_reg(context)+argoff) = 0;
} else {
ptr = MapLS((LPVOID)val);
*(DWORD*)(EBP_reg(context)+argoff) = ptr;
}
fprintf(stderr,"[EBP+%d] %08lx => %08lx\n",argoff,val,ptr);
EAX_reg(context) = ptr;
}
void WINAPI SMapLS_IP_EBP_8(CONTEXT *context) {x_SMapLS_IP_EBP_x(context,8);}
void WINAPI SMapLS_IP_EBP_12(CONTEXT *context) {x_SMapLS_IP_EBP_x(context,12);}
void WINAPI SMapLS_IP_EBP_16(CONTEXT *context) {x_SMapLS_IP_EBP_x(context,16);}
void WINAPI SMapLS_IP_EBP_20(CONTEXT *context) {x_SMapLS_IP_EBP_x(context,20);}
void WINAPI SMapLS_IP_EBP_24(CONTEXT *context) {x_SMapLS_IP_EBP_x(context,24);}
void WINAPI SMapLS_IP_EBP_28(CONTEXT *context) {x_SMapLS_IP_EBP_x(context,28);}
void WINAPI SMapLS_IP_EBP_32(CONTEXT *context) {x_SMapLS_IP_EBP_x(context,32);}
void WINAPI SMapLS_IP_EBP_36(CONTEXT *context) {x_SMapLS_IP_EBP_x(context,36);}
void WINAPI SMapLS_IP_EBP_40(CONTEXT *context) {x_SMapLS_IP_EBP_x(context,40);}
void WINAPI SMapLS(CONTEXT *context)
{
if (EAX_reg(context)>=0x10000) {
EAX_reg(context) = MapLS((LPVOID)EAX_reg(context));
EDX_reg(context) = EAX_reg(context);
} else {
EDX_reg(context) = 0;
}
}
void WINAPI SUnMapLS(CONTEXT *context)
{
if (EAX_reg(context)>=0x10000)
UnMapLS((SEGPTR)EAX_reg(context));
}
static void
x_SUnMapLS_IP_EBP_x(CONTEXT *context,int argoff) {
if (*(DWORD*)(EBP_reg(context)+argoff))
UnMapLS(*(DWORD*)(EBP_reg(context)+argoff));
*(DWORD*)(EBP_reg(context)+argoff)=0;
}
void WINAPI SUnMapLS_IP_EBP_8(CONTEXT *context) { x_SUnMapLS_IP_EBP_x(context,12); }
void WINAPI SUnMapLS_IP_EBP_12(CONTEXT *context) { x_SUnMapLS_IP_EBP_x(context,12); }
void WINAPI SUnMapLS_IP_EBP_16(CONTEXT *context) { x_SUnMapLS_IP_EBP_x(context,16); }
void WINAPI SUnMapLS_IP_EBP_20(CONTEXT *context) { x_SUnMapLS_IP_EBP_x(context,20); }
void WINAPI SUnMapLS_IP_EBP_24(CONTEXT *context) { x_SUnMapLS_IP_EBP_x(context,24); }
void WINAPI SUnMapLS_IP_EBP_28(CONTEXT *context) { x_SUnMapLS_IP_EBP_x(context,28); }
void WINAPI SUnMapLS_IP_EBP_32(CONTEXT *context) { x_SUnMapLS_IP_EBP_x(context,32); }
void WINAPI SUnMapLS_IP_EBP_36(CONTEXT *context) { x_SUnMapLS_IP_EBP_x(context,36); }
void WINAPI SUnMapLS_IP_EBP_40(CONTEXT *context) { x_SUnMapLS_IP_EBP_x(context,40); }
/**********************************************************************
* WOWGetVDMPointer (KERNEL32.55)
* Get linear from segmented pointer. (MSDN lib)
*/
LPVOID WINAPI WOWGetVDMPointer(DWORD vp,DWORD nrofbytes,BOOL32 protected)
{
/* FIXME: add size check too */
fprintf(stdnimp,"WOWGetVDMPointer(%08lx,%ld,%d)\n",vp,nrofbytes,protected);
if (protected)
return PTR_SEG_TO_LIN(vp);
else
return DOSMEM_MapRealToLinear(vp);
}
/**********************************************************************
* GetVDMPointer32W (KERNEL.516)
*/
LPVOID WINAPI GetVDMPointer32W(DWORD vp,DWORD mode)
{
return WOWGetVDMPointer(vp,0,mode);
}
/**********************************************************************
* WOWGetVDMPointerFix (KERNEL32.55)
* Dito, but fix heapsegment (MSDN lib)
*/
LPVOID WINAPI WOWGetVDMPointerFix(DWORD vp,DWORD nrofbytes,BOOL32 protected)
{
/* FIXME: fix heapsegment */
fprintf(stdnimp,"WOWGetVDMPointerFix(%08lx,%ld,%d)\n",vp,nrofbytes,protected);
return WOWGetVDMPointer(vp,nrofbytes,protected);
}
/**********************************************************************
* WOWGetVDMPointerUnFix (KERNEL32.56)
*/
void WINAPI WOWGetVDMPointerUnfix(DWORD vp)
{
fprintf(stdnimp,"WOWGetVDMPointerUnfix(%08lx), STUB\n",vp);
/* FIXME: unfix heapsegment */
}
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