856 lines
20 KiB
NASM
856 lines
20 KiB
NASM
TITLE "Large Integer Arithmetic"
|
|
|
|
|
|
; Copyright (c) 1989 Microsoft Corporation
|
|
|
|
; Module Name:
|
|
|
|
; largeint.s
|
|
|
|
; Abstract:
|
|
|
|
; This module implements routines for performing extended integer
|
|
; arithmtic.
|
|
|
|
; Author:
|
|
|
|
; David N. Cutler (davec) 24-Aug-1989
|
|
|
|
; Environment:
|
|
|
|
; Any mode.
|
|
|
|
; Revision History:
|
|
|
|
|
|
|
|
.386p
|
|
.xlist
|
|
include ks386.inc
|
|
include callconv.inc ; calling convention macros
|
|
.list
|
|
|
|
IFNDEF BLDR_KERNEL_RUNTIME
|
|
EXTRNP _RtlRaiseStatus, 1
|
|
ENDIF
|
|
|
|
|
|
_TEXT$00 SEGMENT DWORD PUBLIC 'CODE'
|
|
ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
|
|
|
|
page ,132
|
|
subttl "RtlLargeIntegerAdd"
|
|
|
|
|
|
; LARGE_INTEGER
|
|
; RtlLargeIntegerAdd (
|
|
; IN LARGE_INTEGER Addend1,
|
|
; IN LARGE_INTEGER Addend2
|
|
; )
|
|
|
|
; Routine Description:
|
|
|
|
; This function adds a signed large integer to a signed large integer and
|
|
; returns the signed large integer result.
|
|
|
|
; Arguments:
|
|
|
|
; (TOS+4) = Addend1 - first addend value
|
|
; (TOS+12) = Addend2 - second addend value
|
|
|
|
; Return Value:
|
|
|
|
; The large integer result is stored in (edx:eax)
|
|
|
|
|
|
|
|
cPublicProc _RtlLargeIntegerAdd ,4
|
|
cPublicFpo 4,0
|
|
|
|
mov eax,[esp]+4 ; (eax)=add1.low
|
|
add eax,[esp]+12 ; (eax)=sum.low
|
|
mov edx,[esp]+8 ; (edx)=add1.hi
|
|
adc edx,[esp]+16 ; (edx)=sum.hi
|
|
stdRET _RtlLargeIntegerAdd
|
|
|
|
stdENDP _RtlLargeIntegerAdd
|
|
|
|
|
|
page
|
|
subttl "Enlarged Integer Multiply"
|
|
|
|
|
|
; LARGE_INTEGER
|
|
; RtlEnlargedIntegerMultiply (
|
|
; IN LONG Multiplicand,
|
|
; IN LONG Multiplier
|
|
; )
|
|
|
|
; Routine Description:
|
|
|
|
; This function multiplies a signed integer by an signed integer and
|
|
; returns a signed large integer result.
|
|
|
|
; Arguments:
|
|
|
|
; (TOS+4) = Factor1
|
|
; (TOS+8) = Factor2
|
|
|
|
; Return Value:
|
|
|
|
; The large integer result is stored in (edx:eax)
|
|
|
|
|
|
|
|
cPublicProc __RtlEnlargedIntegerMultiply ,2
|
|
cPublicFpo 2,0
|
|
|
|
mov eax,[esp]+4 ; (eax) = factor1
|
|
imul dword ptr [esp]+8 ; (edx:eax) = signed result
|
|
stdRET __RtlEnlargedIntegerMultiply
|
|
|
|
stdENDP __RtlEnlargedIntegerMultiply
|
|
|
|
|
|
page
|
|
subttl "Enlarged Unsigned Integer Multiply"
|
|
|
|
|
|
; LARGE_INTEGER
|
|
; RtlEnlargedUnsignedMultiply (
|
|
; IN ULONG Multiplicand,
|
|
; IN ULONG Multiplier
|
|
; )
|
|
|
|
; Routine Description:
|
|
|
|
; This function multiplies an un signed integer by an unsigned integer and
|
|
; returns a signed large integer result.
|
|
|
|
; Arguments:
|
|
|
|
; (TOS+4) = Factor1
|
|
; (TOS+8) = Factor2
|
|
|
|
; Return Value:
|
|
|
|
; The large integer result is stored in (edx:eax)
|
|
|
|
|
|
|
|
cPublicProc __RtlEnlargedUnsignedMultiply ,2
|
|
cPublicFpo 2,0
|
|
|
|
mov eax,[esp]+4 ; (eax) = factor1
|
|
mul dword ptr [esp]+8 ; (edx:eax) = unsigned result
|
|
stdRET __RtlEnlargedUnsignedMultiply
|
|
|
|
stdENDP __RtlEnlargedUnsignedMultiply
|
|
|
|
page
|
|
subttl "Enlarged Unsigned Integer Divide"
|
|
|
|
|
|
|
|
; ULONG
|
|
; RtlEnlargedUnsignedDivide (
|
|
; IN ULARGE_INTEGER Dividend,
|
|
; IN ULONG Divisor,
|
|
; IN PULONG Remainder
|
|
; )
|
|
|
|
|
|
; Routine Description:
|
|
|
|
; This function divides an unsigned large integer by an unsigned long
|
|
; and returns the resultant quotient and optionally the remainder.
|
|
|
|
; Arguments:
|
|
|
|
; Dividend - Supplies the dividend value.
|
|
|
|
; Divisor - Supplies the divisor value.
|
|
|
|
; Remainder - Supplies an optional pointer to a variable that
|
|
; receives the remainder.
|
|
|
|
; Return Value:
|
|
|
|
; The unsigned long integer quotient is returned as the function value.
|
|
|
|
|
|
|
|
cPublicProc __RtlEnlargedUnsignedDivide,4
|
|
cPublicFpo 4,0
|
|
|
|
mov eax, [esp+4] ; (eax) = Dividend.LowPart
|
|
mov edx, [esp+8] ; (edx) = Dividend.HighPart
|
|
mov ecx, [esp+16] ; (ecx) = pRemainder
|
|
div dword ptr [esp+12] ; divide by Divisor
|
|
|
|
or ecx, ecx ; return remainder?
|
|
jnz short @f
|
|
|
|
stdRET __RtlEnlargedUnsignedDivide ; (eax) = Quotient
|
|
|
|
align 4
|
|
@@: mov [ecx], edx ; save remainder
|
|
stdRET __RtlEnlargedUnsignedDivide ; (eax) = Quotient
|
|
|
|
stdENDP __RtlEnlargedUnsignedDivide
|
|
|
|
page
|
|
subttl "Extended Large Integer Divide"
|
|
|
|
|
|
|
|
; LARGE_INTEGER
|
|
; RtlExtendedLargeIntegerDivide (
|
|
; IN LARGE_INTEGER Dividend,
|
|
; IN ULONG Divisor,
|
|
; OUT PULONG Remainder OPTIONAL
|
|
; )
|
|
|
|
; Routine Description:
|
|
|
|
; This routine divides an unsigned 64 bit dividend by a 32 bit divisor
|
|
; and returns a 64-bit quotient, and optionally the 32-bit remainder.
|
|
|
|
|
|
; Arguments:
|
|
|
|
; Dividend - Supplies the 64 bit dividend for the divide operation.
|
|
|
|
; Divisor - Supplies the 32 bit divisor for the divide operation.
|
|
|
|
; Remainder - Supplies an optional pointer to a variable which receives
|
|
; the remainder
|
|
|
|
; Return Value:
|
|
|
|
; The 64-bit quotient is returned as the function value.
|
|
|
|
|
|
|
|
cPublicProc _RtlExtendedLargeIntegerDivide, 4
|
|
cPublicFpo 4,3
|
|
|
|
push esi
|
|
push edi
|
|
push ebx
|
|
|
|
mov eax, [esp+16] ; (eax) = Dividend.LowPart
|
|
mov edx, [esp+20] ; (edx) = Dividend.HighPart
|
|
|
|
lid00: mov ebx, [esp+24] ; (ebx) = Divisor
|
|
or ebx, ebx
|
|
jz short lid_zero ; Attempted a divide by zero
|
|
|
|
push ebp
|
|
|
|
mov ecx, 64 ; Loop count
|
|
xor esi, esi ; Clear partial remainder
|
|
|
|
; (edx:eax) = Dividend
|
|
; (ebx) = Divisor
|
|
; (ecx) = Loop count
|
|
; (esi) = partial remainder
|
|
|
|
align 4
|
|
lid10: shl eax, 1 ; (LowPart << 1) | 0
|
|
rcl edx, 1 ; (HighPart << 1) | CF
|
|
rcl esi, 1 ; (Partial << 1) | CF
|
|
|
|
sbb edi, edi ; clone CF into edi (0 or -1)
|
|
|
|
cmp esi, ebx ; check if partial remainder less then divisor
|
|
cmc
|
|
sbb ebp, ebp ; clone CF intp ebp
|
|
or edi, ebp ; merge with remainder of high bit
|
|
|
|
sub eax, edi ; merge quotient bit
|
|
and edi, ebx ; Select divisor or 0
|
|
sub esi, edi
|
|
|
|
dec ecx ; dec interration count
|
|
jnz short lid10 ; go around again
|
|
|
|
pop ebp
|
|
pop ebx
|
|
pop edi
|
|
|
|
mov ecx, [esp+20] ; (ecx) = Remainder
|
|
or ecx, ecx
|
|
jnz short lid20
|
|
|
|
pop esi
|
|
stdRET _RtlExtendedLargeIntegerDivide
|
|
|
|
align 4
|
|
lid20:
|
|
mov [ecx], esi ; store remainder
|
|
pop esi
|
|
stdRET _RtlExtendedLargeIntegerDivide
|
|
|
|
lid_zero:
|
|
IFNDEF BLDR_KERNEL_RUNTIME
|
|
stdCall _RtlRaiseStatus, <STATUS_INTEGER_DIVIDE_BY_ZERO>
|
|
ENDIF
|
|
pop ebx
|
|
pop edi
|
|
pop esi
|
|
stdRET _RtlExtendedLargeIntegerDivide
|
|
|
|
stdENDP _RtlExtendedLargeIntegerDivide
|
|
|
|
page
|
|
subttl "Extended Magic Divide"
|
|
|
|
|
|
; LARGE_INTEGER
|
|
; RtlExtendedMagicDivide (
|
|
; IN LARGE_INTEGER Dividend,
|
|
; IN LARGE_INTEGER MagicDivisor,
|
|
; IN CCHAR ShiftCount
|
|
; )
|
|
|
|
; Routine Description:
|
|
|
|
; This function divides a signed large integer by an unsigned large integer
|
|
; and returns the signed large integer result. The division is performed
|
|
; using reciprocal multiplication of a signed large integer value by an
|
|
; unsigned large integer fraction which represents the most significant
|
|
; 64-bits of the reciprocal divisor rounded up in its least significant bit
|
|
; and normalized with respect to bit 63. A shift count is also provided
|
|
; which is used to truncate the fractional bits from the result value.
|
|
|
|
; Arguments:
|
|
|
|
; (ebp+8) = Dividend
|
|
; (ebp+16) = MagicDivisor value is a 64-bit multiplicative reciprocal
|
|
; (ebp+24) = ShiftCount - Right shift adjustment value.
|
|
|
|
; Return Value:
|
|
|
|
; The large integer result is stored in (edx:eax)
|
|
|
|
|
|
|
|
RemdDiv equ [ebp+8] ; Dividend
|
|
RemdRec equ [ebp+16] ; Reciprocal (magic divisor)
|
|
RemdShift equ [ebp+24]
|
|
RemdTmp1 equ [ebp-4]
|
|
RemdTmp2 equ [ebp-8]
|
|
RemdTmp3 equ [ebp-12]
|
|
|
|
cPublicProc _RtlExtendedMagicDivide ,5
|
|
|
|
push ebp
|
|
mov ebp,esp
|
|
sub esp,12
|
|
push esi
|
|
|
|
mov esi, RemdDiv+4
|
|
test esi,80000000h
|
|
jz remd10 ; no sign, no need to negate
|
|
|
|
neg dword ptr RemdDiv+4
|
|
neg dword ptr RemdDiv
|
|
sbb dword ptr RemdDiv+4,0 ; negate
|
|
|
|
remd10: mov eax,RemdRec
|
|
mul dword ptr RemdDiv ; (edx:eax) = Div.lo * Rec.lo
|
|
mov RemdTmp1,edx
|
|
|
|
mov eax,RemdRec
|
|
mul dword ptr RemdDiv+4 ; (edx:eax) = Div.hi * Rec.lo
|
|
mov RemdTmp2,eax
|
|
mov RemdTmp3,edx
|
|
|
|
mov eax,RemdRec+4
|
|
mul dword ptr RemdDiv ; (edx:eax) = Div.lo * Rec.hi
|
|
|
|
|
|
; Col 0 doesn't matter
|
|
; Col 1 = Hi(Div.lo * Rec.lo) + Low(Div.Hi * Rec.lo) + Low(Div.lo * Rec.hi)
|
|
; = RemdTmp1 + RemdTmp2 + eax
|
|
; -> Only want carry from Col 1
|
|
|
|
|
|
xor ecx,ecx ; (ecx) = 0
|
|
add eax,RemdTmp1
|
|
adc ecx, 0 ; save carry in ecx
|
|
add eax,RemdTmp2
|
|
adc ecx, 0 ; Save Carry, all we want from Col2
|
|
|
|
mov RemdTmp1,edx
|
|
|
|
mov eax,RemdRec+4
|
|
mul dword ptr RemdDiv+4 ; (edx:eax) = Div.Hi * Rec.Hi
|
|
|
|
|
|
; TOS = carry flag from Col 1
|
|
|
|
; Col 2 = Col1 CF +
|
|
; Hi(Div.Hi * Rec.Lo) + Hi(Div.Lo * Rec.Hi) + Low(Div.Hi * Rec.Hi)
|
|
; = CF + RemdTmp3 + RemdTmp1 + eax
|
|
|
|
; Col 3 = Col2 CF + Hi(Div.Hi * Rec.Hi)
|
|
; = CF + edx
|
|
|
|
|
|
add eax,RemdTmp1
|
|
adc edx, 0 ; add carry to edx
|
|
add eax,RemdTmp3 ; (eax) = col 2
|
|
adc edx, 0 ; add carry to edx
|
|
add eax, ecx
|
|
adc edx, 0 ; (edx) = col 3
|
|
|
|
|
|
; (edx:eax) = the high 64 bits of the multiply, shift it right by
|
|
; shift count to discard bits to right of virtual decimal pt.
|
|
|
|
; RemdShift could be as large as 63 and still not 0 the result, 386
|
|
; will only shift 31 bits at a time, so must do the sift multiple
|
|
; times to get correct effect.
|
|
|
|
|
|
mov cl,RemdShift
|
|
remd20: cmp cl,31
|
|
jbe remd30
|
|
sub cl,31
|
|
shrd eax,edx,31
|
|
shr edx,31
|
|
jmp remd20
|
|
|
|
remd30: shrd eax,edx,cl
|
|
shr edx,cl
|
|
|
|
|
|
; Negate the result if need be
|
|
|
|
|
|
test esi,80000000h
|
|
jz remd40 ; no sign, go return without negate
|
|
|
|
neg edx
|
|
neg eax
|
|
sbb edx,0
|
|
|
|
|
|
; Store the result
|
|
|
|
|
|
remd40:
|
|
; results in (edx:eax)
|
|
|
|
pop esi
|
|
mov esp,ebp
|
|
pop ebp
|
|
stdRET _RtlExtendedMagicDivide
|
|
|
|
stdENDP _RtlExtendedMagicDivide
|
|
|
|
|
|
page
|
|
subttl "Extended Integer Multiply"
|
|
|
|
|
|
; LARGE_INTEGER
|
|
; RtlExtendedIntegerMultiply (
|
|
; IN LARGE_INTEGER Multiplicand,
|
|
; IN ULONG Multiplier
|
|
; )
|
|
|
|
; Routine Description:
|
|
|
|
; This function multiplies a signed large integer by a signed integer and
|
|
; returns the signed large integer result.
|
|
|
|
; Arguments:
|
|
|
|
; (ebp+8,12)=multiplican (MCAN)
|
|
; (ebp+16)=multiplier (MPER)
|
|
|
|
; Return Value:
|
|
|
|
; The large integer result is stored in (edx:eax)
|
|
|
|
|
|
|
|
ReimMCAN equ <dword ptr [ebp+8]>
|
|
ReimMPER equ <dword ptr [ebp+16]>
|
|
|
|
cPublicProc _RtlExtendedIntegerMultiply ,3
|
|
|
|
push ebp
|
|
mov ebp,esp
|
|
push esi
|
|
|
|
mov esi,ReimMPER
|
|
xor esi,ReimMCAN+4 ; (esi) = result sign
|
|
|
|
test ReimMCAN+4,80000000h
|
|
jz short reim10 ; MCAN pos, go look at MPER
|
|
|
|
neg dword ptr ReimMCAN+4
|
|
neg dword ptr ReimMCAN
|
|
sbb dword ptr ReimMCAN+4,0 ; negate multiplican
|
|
|
|
reim10: test ReimMPER,80000000h
|
|
jz short reim20 ; MPER pos, go do multiply
|
|
|
|
neg dword ptr ReimMPER ; negate multiplier
|
|
|
|
reim20: mov eax,ReimMPER
|
|
mul dword ptr ReimMCAN ; (edx:eax) = MPER * MCAN.low
|
|
push edx
|
|
mov ecx, eax
|
|
mov eax,ReimMPER
|
|
mul dword ptr ReimMCAN+4 ; (edx:eax) = MPER * MCAN.high
|
|
add eax,[esp] ; (eax) = hi part of MPER*MCAN.low
|
|
; plus low part of MPER*MCAN.hi
|
|
|
|
test esi,80000000h
|
|
jz short reim30 ; result sign is OK, go return
|
|
|
|
neg eax
|
|
neg ecx
|
|
sbb eax,0 ; negate result
|
|
|
|
reim30: add esp,4 ; clean eax off stack
|
|
pop esi ; restore nonvolatile reg
|
|
mov edx,eax ; (edx:ecx) = result
|
|
mov eax,ecx ; (edx:eax) = result
|
|
|
|
pop ebp
|
|
stdRET _RtlExtendedIntegerMultiply
|
|
|
|
stdENDP _RtlExtendedIntegerMultiply
|
|
|
|
page
|
|
subttl "Large Integer Shift Left"
|
|
|
|
|
|
; LARGE_INTEGER
|
|
; RtlLargeIntegerShiftLeft (
|
|
; IN LARGE_INTEGER LargeInteger,
|
|
; IN CCHAR ShiftCount
|
|
; )
|
|
|
|
|
|
; Routine Description:
|
|
|
|
; This routine does a left logical shift of a large integer by a
|
|
; specified amount (ShiftCount) modulo 64.
|
|
|
|
; Arguments:
|
|
|
|
; LargeInteger - Supplies the large integer to be shifted
|
|
|
|
; ShiftCount - Supplies the left shift count
|
|
|
|
; Return Value:
|
|
|
|
; LARGE_INTEGER - Receives the shift large integer result
|
|
|
|
|
|
cPublicProc _RtlLargeIntegerShiftLeft,3
|
|
cPublicFpo 3,0
|
|
|
|
mov ecx, [esp+12] ; (ecx) = ShiftCount
|
|
and ecx, 3fh ; mod 64
|
|
|
|
cmp ecx, 32
|
|
jnc short sl10
|
|
|
|
; Shift count is less then 32 bits.
|
|
|
|
mov eax, [esp+4] ; (eax) = LargeInteger.LowPart
|
|
mov edx, [esp+8] ; (edx) = LargeInteger.HighPart
|
|
shld edx, eax, cl
|
|
shl eax, cl
|
|
|
|
stdRET _RtlLargeIntegerShiftLeft
|
|
|
|
align 4
|
|
sl10:
|
|
|
|
; Shift count is greater than or equal 32 bits - low half of result is zero,
|
|
; high half is the low half shifted left by remaining count.
|
|
|
|
mov edx, [esp+4] ; (edx) = LargeInteger.LowPart
|
|
xor eax, eax ; store lowpart
|
|
shl edx, cl ; store highpart
|
|
|
|
stdRET _RtlLargeIntegerShiftLeft
|
|
|
|
stdENDP _RtlLargeIntegerShiftLeft
|
|
|
|
page
|
|
subttl "Large Integer Shift Right"
|
|
|
|
|
|
|
|
;LARGE_INTEGER
|
|
;RtlLargeIntegerShiftRight (
|
|
; IN LARGE_INTEGER LargeInteger,
|
|
; IN CCHAR ShiftCount
|
|
; )
|
|
|
|
;Routine Description:
|
|
|
|
; This routine does a right logical shift of a large integer by a
|
|
; specified amount (ShiftCount) modulo 64.
|
|
|
|
;Arguments:
|
|
|
|
; LargeInteger - Supplies the large integer to be shifted
|
|
|
|
; ShiftCount - Supplies the right shift count
|
|
|
|
;Return Value:
|
|
|
|
; LARGE_INTEGER - Receives the shift large integer result
|
|
|
|
;--*/
|
|
cPublicProc _RtlLargeIntegerShiftRight,3
|
|
cPublicFpo 3,0
|
|
|
|
mov ecx, [esp+12] ; (ecx) = ShiftCount
|
|
and ecx, 3fh ; mod 64
|
|
|
|
cmp ecx, 32
|
|
jnc short sr10
|
|
|
|
|
|
; Shift count is less then 32 bits.
|
|
|
|
mov eax, [esp+4] ; (eax) = LargeInteger.LowPart
|
|
mov edx, [esp+8] ; (edx) = LargeInteger.HighPart
|
|
shrd eax, edx, cl
|
|
shr edx, cl
|
|
|
|
stdRET _RtlLargeIntegerShiftRight
|
|
|
|
align 4
|
|
sr10:
|
|
|
|
; Shift count is greater than or equal 32 bits - high half of result is zero,
|
|
; low half is the high half shifted right by remaining count.
|
|
|
|
mov eax, [esp+8] ; (eax) = LargeInteger.HighPart
|
|
xor edx, edx ; store highpart
|
|
shr eax, cl ; store lowpart
|
|
|
|
stdRET _RtlLargeIntegerShiftRight
|
|
|
|
stdENDP _RtlLargeIntegerShiftRight
|
|
|
|
|
|
|
|
;LARGE_INTEGER
|
|
;RtlLargeIntegerArithmeticShift (
|
|
; IN LARGE_INTEGER LargeInteger,
|
|
; IN CCHAR ShiftCount
|
|
; )
|
|
|
|
;Routine Description:
|
|
|
|
; This routine does a right arithmetic shift of a large integer by a
|
|
; specified amount (ShiftCount) modulo 64.
|
|
|
|
;Arguments:
|
|
|
|
; LargeInteger - Supplies the large integer to be shifted
|
|
|
|
; ShiftCount - Supplies the right shift count
|
|
|
|
;Return Value:
|
|
|
|
; LARGE_INTEGER - Receives the shift large integer result
|
|
|
|
|
|
cPublicProc _RtlLargeIntegerArithmeticShift,3
|
|
cPublicFpo 3,0
|
|
|
|
mov ecx, [esp+12] ; (ecx) = ShiftCount
|
|
and ecx, 3fh ; mod 64
|
|
|
|
cmp ecx, 32
|
|
jc short sar10
|
|
|
|
|
|
; Shift count is greater than or equal 32 bits - high half of result is sign
|
|
; bit, low half is the high half shifted right by remaining count.
|
|
|
|
mov eax, [esp+8] ; (eax) = LargeInteger.HighPart
|
|
sar eax, cl ; store highpart
|
|
bt eax, 31 ; sign bit set?
|
|
sbb edx, edx ; duplicate sign bit into highpart
|
|
|
|
stdRET _RtlLargeIntegerArithmeticShift
|
|
|
|
align 4
|
|
sar10:
|
|
|
|
; Shift count is less then 32 bits.
|
|
|
|
|
|
mov eax, [esp+4] ; (eax) = LargeInteger.LowPart
|
|
mov edx, [esp+8] ; (edx) = LargeInteger.HighPart
|
|
shrd eax, edx, cl
|
|
sar edx, cl
|
|
|
|
stdRET _RtlLargeIntegerArithmeticShift
|
|
|
|
stdENDP _RtlLargeIntegerArithmeticShift,3
|
|
|
|
|
|
page
|
|
subttl "Large Integer Negate"
|
|
|
|
|
|
; LARGE_INTEGER
|
|
; RtlLargeIntegerNegate (
|
|
; IN LARGE_INTEGER Subtrahend
|
|
; )
|
|
|
|
; Routine Description:
|
|
|
|
; This function negates a signed large integer and returns the signed
|
|
; large integer result.
|
|
|
|
; Arguments:
|
|
|
|
; (TOS+4) = Subtrahend
|
|
|
|
; Return Value:
|
|
|
|
; The large integer result is stored in (edx:eax)
|
|
|
|
|
|
|
|
cPublicProc _RtlLargeIntegerNegate ,2
|
|
cPublicFpo 2,0
|
|
|
|
mov eax,[esp]+4 ; (eax) = lo
|
|
mov edx,[esp]+8
|
|
neg edx ; (edx) = 2's comp of hi part
|
|
neg eax ; if ((eax) == 0) CF = 0
|
|
; else CF = 1
|
|
sbb edx,0 ; (edx) = (edx) - CF
|
|
; (edx:eax) = result
|
|
stdRET _RtlLargeIntegerNegate
|
|
|
|
stdENDP _RtlLargeIntegerNegate
|
|
|
|
|
|
page
|
|
subttl "Large Integer Subtract"
|
|
|
|
|
|
; LARGE_INTEGER
|
|
; RtlLargeIntegerSubtract (
|
|
; IN LARGE_INTEGER Minuend,
|
|
; IN LARGE_INTEGER Subtrahend
|
|
; )
|
|
|
|
; Routine Description:
|
|
|
|
; This function subtracts a signed large integer from a signed large
|
|
; integer and returns the signed large integer result.
|
|
|
|
; Arguments:
|
|
|
|
; (TOS+4) = Minuend
|
|
; (TOS+12) = Subtrahend
|
|
|
|
; Return Value:
|
|
|
|
; The large integer result is stored in (edx:eax)
|
|
|
|
|
|
|
|
cPublicProc _RtlLargeIntegerSubtract ,4
|
|
cPublicFpo 4,0
|
|
|
|
mov eax,[esp]+4
|
|
sub eax,[esp]+12 ; (eax) = result.low
|
|
mov edx,[esp]+8
|
|
sbb edx,[esp]+16 ; (edx) = result.high
|
|
stdRET _RtlLargeIntegerSubtract
|
|
|
|
stdENDP _RtlLargeIntegerSubtract
|
|
|
|
page
|
|
subttl "Convert Long to Large Integer"
|
|
|
|
|
|
; LARGE_INTEGER
|
|
; RtlConvertLongToLargeInteger (
|
|
; IN LONG SignedInteger
|
|
; )
|
|
|
|
; Routine Description:
|
|
|
|
; This function converts the input signed integer to a signed large
|
|
; integer and returns the latter as the result.
|
|
|
|
; Arguments:
|
|
|
|
; (TOS+4) = SignedInteger
|
|
|
|
; Return Value:
|
|
|
|
; The large integer result is stored (edx:eax)
|
|
|
|
|
|
|
|
cPublicProc _RtlConvertLongToLargeInteger ,1
|
|
cPublicFpo 1,0
|
|
|
|
mov eax,[esp]+4 ; (eax) = SignedInteger
|
|
cdq ; (edx:eax) = signed LargeInt
|
|
stdRET _RtlConvertLongToLargeInteger
|
|
|
|
stdENDP _RtlConvertLongToLargeInteger
|
|
|
|
|
|
page
|
|
subttl "Convert Ulong to Large Integer"
|
|
|
|
|
|
; LARGE_INTEGER
|
|
; RtlConvertUlongToLargeInteger (
|
|
; IN LONG UnsignedInteger
|
|
; )
|
|
|
|
; Routine Description:
|
|
|
|
; This function converts the input unsigned integer to a signed large
|
|
; integer and returns the latter as the result.
|
|
|
|
; Arguments:
|
|
|
|
; (TOS+4) = UnsignedInteger
|
|
|
|
; Return Value:
|
|
|
|
; The large integer result is stored in (edx:eax)
|
|
|
|
|
|
|
|
cPublicProc _RtlConvertUlongToLargeInteger ,1
|
|
cPublicFpo 1,0
|
|
|
|
mov eax,[esp]+4 ; store low
|
|
xor edx,edx ; store 0 in high
|
|
stdRET _RtlConvertUlongToLargeInteger
|
|
|
|
stdENDP _RtlConvertUlongToLargeInteger
|
|
|
|
|
|
_TEXT$00 ends
|
|
end
|