.686 ; create 32 bit code
.mmx
.xmm
.model flat, stdcall ; 32 bit memory model
option casemap :none ; case sensitive
.code
; ml -c /omf ad.asm
; Microsoft (R) Macro Assembler Version 10.00.30319.01
; Copyright (C) Microsoft Corporation. All rights reserved.
_align16_zero_memory proc C _byte_num, _source
option prologue:none, epilogue:none
mov eax, [esp+4] ; - U load _byte_num
push edi ; - V save old frame
mov edi, [esp+12] ; - U load _source
push ecx ; - V save old frame
mov ecx, eax ; - U save old frame
nop ; - V spare
shr eax, 7 ; - U get round
je _remain_byte_deal ; - V/N deal remain frame
pxor xmm0, xmm0 ; get zero
align 16
main_loop:
movdqa [edi], xmm0
movdqa [edi+010h], xmm0
movdqa [edi+020h], xmm0
movdqa [edi+030h], xmm0
movdqa [edi+040h], xmm0
movdqa [edi+050h], xmm0
movdqa [edi+060h], xmm0
movdqa [edi+070h], xmm0
add edi, 128
nop
dec eax
jnz main_loop ; jnz opr ... maybe unsafe ...
mov eax, ecx ; - U save old frame
and ecx, 112 ; - V/N 0x0111 0000
shr ecx, 3 ; - U 0x0000 1110 0/2/4/6/
align 16 ; - V/N maybe jmp opcode/nop opcode
_remain_byte_deal:
pxor xmm0, xmm0 ; get zero
lea edi, [edi-070h+ecx*8] ; - N
jmp [RemainDQwordTable+ecx*4] ; - N
align 16
SB0E:
SB0F:
movdqa [edi], xmm0
SB0C:
SB0D:
movdqa [edi+010h], xmm0
SB0A:
SB0B:
movdqa [edi+020h], xmm0
SB08:
SB09:
movdqa [edi+030h], xmm0
SB06:
SB07:
movdqa [edi+040h], xmm0
SB04:
SB05:
movdqa [edi+050h], xmm0
SB02:
SB03:
movdqa [edi+060h], xmm0
SB00:
SB01:
neg ecx
and eax, 15
lea edi, [edi+070h+ecx*8]
mov ecx, eax
xor eax, eax
cld
rep stosb
pop ecx
pop edi
ret
RemainDQwordTable dd SB00, SB01, SB02, SB03, SB04, SB05, SB06, SB07
dd SB08, SB09, SB0A, SB0B, SB0C, SB0D, SB0E, SB0F
_align16_zero_memory endp
SetUpZeroMem proc C _byte_num, _source
option prologue:none, epilogue:none
mov eax, [esp+8] ; - U load source
push edi ; - V save old frame
mov edi, eax ; - U
push ecx ; - V save old frame
mov ecx, [esp+12] ; - U load num
nop ; - V spare
cmp ecx, 16
jb __miniature_copy
and eax, 15 ; - U
jmp [eax*4+_ByteTable]
align 16
OP00:
push edi
push ecx
call _align16_zero_memory
add esp, 8
pop ecx
pop edi
ret
OP01: ; 0000 0001
mov byte ptr [edi], 0
mov word ptr [edi+1], 0
mov dword ptr [edi+3], 0
mov dword ptr [edi+7], 0
mov dword ptr [edi+11], 0
add edi, 15
sub ecx, 15
jmp OP00
OP02: ; 0000 0002
mov word ptr [edi], 0
mov dword ptr [edi+2], 0
mov dword ptr [edi+6], 0
mov dword ptr [edi+10], 0
add edi, 14
sub ecx, 14
jmp OP00
OP03: ; 0000 0003
mov byte ptr [edi], 0
mov dword ptr [edi+1], 0
mov dword ptr [edi+5], 0
mov dword ptr [edi+9], 0
add edi, 13
sub ecx, 13
jmp OP00
OP04: ; 0000 0004
mov dword ptr [edi], 0
mov dword ptr [edi+4], 0
mov dword ptr [edi+8], 0
add edi, 12
sub ecx, 12
jmp OP00
OP05: ; 0000 0005
mov byte ptr [edi], 0
mov word ptr [edi+1], 0
mov dword ptr [edi+3], 0
mov dword ptr [edi+7], 0
add edi, 11
sub ecx, 11
jmp OP00
OP06: ; 0000 0006
mov word ptr [edi], 0
mov dword ptr [edi+2], 0
mov dword ptr [edi+6], 0
add edi, 10
sub ecx, 10
jmp OP00
OP07: ; 0000 0007
mov byte ptr [edi], 0
mov dword ptr [edi+1], 0
mov dword ptr [edi+5], 0
add edi, 9
sub ecx, 9
jmp OP00
OP08:
mov dword ptr [edi], 0
mov dword ptr [edi+8], 0
sub ecx, 8
add edi, 8
jmp OP00
OP09:
mov byte ptr [edi], 0
mov word ptr [edi+1], 0
mov dword ptr [edi+3], 0
sub ecx, 7
add edi, 7
jmp OP00
OP0A:
mov word ptr [edi], 0
mov dword ptr [edi+2], 0
sub ecx, 6
add edi, 6
jmp OP00
OP0B:
mov byte ptr [edi], 0
mov dword ptr [edi+1], 0
sub ecx, 5
add edi, 5
jmp OP00
OP0C:
mov dword ptr [edi], 0
sub ecx, 4
add edi, 4
jmp OP00
OP0D:
mov byte ptr [edi], 0
mov word ptr [edi+2], 0
sub ecx, 3
add edi, 3
jmp OP00
OP0E:
mov word ptr [edi], 0
sub ecx, 2
add edi, 2
jmp OP00
OP0F:
mov byte ptr [edi], 0
dec ecx
inc edi
jmp OP00
__miniature_copy:
cld
xor eax, eax
rep stosb ; rep maybe rubbish
pop ecx
pop edi
ret
_ByteTable dd OP00, OP01, OP02, OP03, OP04, OP05, OP06, OP07
dd OP08, OP09, OP0A, OP0B, OP0C, OP0D, OP0E, OP0F
SetUpZeroMem endp
end
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