unit MLDE32Unit;
//Micro Length Disassembler Engine
interface
//作者忘记了，不好意思。好像出自29A-7。
//sorry, author!
function LDE32(Opcode: pointer): integer;
implementation
function LDE32(Opcode: pointer): integer;
const
//****************
//* Opcode types *
//****************
O_UNIQUE = 0;
O_PREFIX = 1;
O_IMM8 = 2;
O_IMM16 = 3;
O_IMM24 = 4;
O_IMM32 = 5;
O_IMM48 = 6;
O_MODRM = 7;
O_MODRM8 = 8;
O_MODRM32 = 9;
O_EXTENDED = 10;
O_WEIRD = 11;
O_ERROR = 12;
function MLDE32(Opcode:Pointer): integer;
asm
pushad
cld
xor edx, edx
mov esi, [esp+(8*4)+4]
mov ebp, esp
// 256 bytes, index-compressed opcode type table
push 01097F71Ch
push 0F71C6780h
push 017389718h
push 0101CB718h
push 017302C17h
push 018173017h
push 0F715F547h
push 04C103748h
push 0272CE7F7h
push 0F7AC6087h
push 01C121C52h
push 07C10871Ch
push 0201C701Ch
push 04767602Bh
push 020211011h
push 040121625h
push 082872022h
push 047201220h
push 013101419h
push 018271013h
push 028858260h
push 015124045h
push 05016A0C7h
push 028191812h
push 0F2401812h
push 019154127h
push 050F0F011h
mov ecx, 015124710h
push ecx
push 011151247h
push 010111512h
push 047101115h
mov eax, 012472015h
push eax
push eax
push 012471A10h
add cl, 10h
push ecx
sub cl, 20h
push ecx
xor ecx, ecx
dec ecx
// code starts
@@ps: inc ecx
mov edi, esp
@@go: lodsb
mov bh, al
@@ft: mov ah, [edi]
inc edi
shr ah, 4
sub al, ah
jnc @@ft
mov al, [edi-1]
and al, 0Fh
cmp al, O_ERROR
jnz @@i7
pop edx
not edx
@@i7: inc edx
cmp al, O_UNIQUE
jz @@t_exit
cmp al, O_PREFIX
jz @@ps
add edi, 51h //(@@_ettbl - @@_ttbl)
cmp al, O_EXTENDED
jz @@go
mov edi, [ebp+(8*4)+4]
@@i6: inc edx
cmp al, O_IMM8
jz @@t_exit
cmp al, O_MODRM
jz @@t_modrm
cmp al, O_WEIRD
jz @@t_weird
@@i5: inc edx
cmp al, O_IMM16
jz @@t_exit
cmp al, O_MODRM8
jz @@t_modrm
@@i4: inc edx
cmp al, O_IMM24
jz @@t_exit
@@i3: inc edx
@@i2: inc edx
pushad
mov al, 66h
repnz scasb
popad
jnz @@c32
@@d2: dec edx
dec edx
@@c32: cmp al, O_MODRM32
jz @@t_modrm
sub al, O_IMM32
jz @@t_imm32
@@i1: inc edx
@@t_exit:
mov esp, ebp
mov [esp+(7*4)], edx
popad
ret
//*********************************
//* PROCESS THE MOD/RM BYTE *
//* *
//* 7 6 5 3 2 0 *
//* | MOD | Reg/Opcode | R/M | *
//* *
//*********************************
@@t_modrm:
lodsb
mov ah, al
shr al, 7
jb @@prmk
jz @@prm
add dl, 4
pushad
mov al, 67h
repnz scasb
popad
jnz @@prm
@@d3: sub dl, 3
dec al
@@prmk:jnz @@t_exit
inc edx
inc eax
@@prm:
and ah, 00000111b
pushad
mov al, 67h
repnz scasb
popad
jz @@prm67chk
cmp ah, 04h
jz @@prmsib
cmp ah, 05h
jnz @@t_exit
@@prm5chk:
dec al
jz @@t_exit
@@i42: add dl, 4
jmp @@t_exit
@@prm67chk:
cmp ax, 0600h
jnz @@t_exit
inc edx
jmp @@i1
@@prmsib:
cmp al, 00h
jnz @@i1
lodsb
and al, 00000111b
sub al, 05h
jnz @@i1
inc edx
jmp @@i42
//****************************
//* PROCESS WEIRD OPCODES *
//* *
//* Fucking test (F6h/F7h) *
//* *
//****************************
@@t_weird:
test byte ptr [esi], 00111000b
jnz @@t_modrm
mov al, O_MODRM8
shr bh, 1
adc al, 0
jmp @@i5
//*********************************
//* PROCESS SOME OTHER SHIT *
//* *
//* Fucking mov (A0h/A1h/A2h/A3h) *
//* *
//*********************************
@@t_imm32:
sub bh, 0A0h
cmp bh, 04h
jae @@d2
pushad
mov al, 67h
repnz scasb
popad
jnz @@chk66t
@@d4: dec edx
dec edx
@@chk66t:
pushad
mov al, 66h
repnz scasb
popad
jz @@i1
jnz @@d2
end;
begin
asm
push Opcode
call MLDE32
add esp, 4
end;
end;
end.
=========
完