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Disasm.pas
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Disasm.pas
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Unit Disasm;
Interface
Uses Windows, Def_disasm;
Type
DisType = (
distX8616, // Intel x86 (16 bit mode)
distX86, // Intel x86 (32 bit mode)
distMips, // MIPS R-Series
distAlphaAxp, // DEC Alpha AXP
distPowerPc, // Motorola PowerPC
distPowerMac, // Motorola PowerPC in big endian mode
distOmni, // OMNI VM
distJava, // Java
distSh, // Hitachi SuperH
distArm, // ARM
distMips16, // MIPS16
distThumb, // Thumb
distIa64 // IA-64
);
// Architecture dependent termination type
TRMTA = (
trmtaUnknown, // 0 Block hasn't been analyzed
trmtaFallThrough, // 1 Fall into following block
trmtaTrap, // 2 Trap, Unconditional
trmtaTrapCc, // 3 Trap, Conditional
trmtaJmpShort, // 4
trmtaJmpNear, // 5
trmtaJmpFar, // 6
trmtaJmpInd, // 7
trmtaRet, // 8
trmtaIret, // 9
trmtaJmpCcShort, // 10
trmtaJmpCcNear, // 11
trmtaLoop, // 12
trmtaJcxz, // 13
trmtaCallNear16, // 14
trmtaCallNear32, // 15
trmtaCallFar, // 16
trmtaCallInd // 17
);
REGA = (
regaEax, // 0
regaEcx, // 1
regaEdx, // 2
regaEbx, // 3
regaEsp, // 4
regaEbp, // 5
regaEsi, // 6
regaEdi // 7
);
OPREFT = (
opreftNil, // Operand not referenced (e.g. INVLPG)
opreftRd, // Operand is read
opreftRw, // Operand is read and written
opreftWr // Operand is written
);
OPRNDT = ( // Operand type
oprndtNil, // No operand
oprndtAP, // Far address
oprndtCd, // CRx register from MODRM reg
oprndtConst, // Constant from bValue
oprndtDd, // DRx register from MODRM reg
oprndtGvOp, // General register (operand size) from opcode
oprndtGvOp2, // General register (operand size) from opcode (2nd byte)
oprndtIb, // Immediate byte
oprndtIb2, // Immediate byte following word
oprndtIv, // Immediate operand size value
oprndtIw, // Immediate word
oprndtJb, // Relative address byte
oprndtJv, // Relative address operand size value
oprndtMmModrm, // Memory/MM register references from MODRM (MMX)
oprndtMmModrmReg, // MM register from MODRM reg (MMX)
oprndtModrm, // Memory/register references from MODRM
oprndtModrmReg, // General register from MODRM reg
oprndtModrmSReg, // Segment register from MODRM reg
oprndtOffset, // Address size immediate offset
oprndtRb, // General register (byte) from bValue
oprndtRv, // General register (operand size) from bValue
oprndtRw, // General register (word) from bValue
oprndtST, // Floating point top of stack
oprndtSTi, // Floating point register from MODRM reg
oprndtSw, // Segment register (word) from bValue
oprndtTd, // TRx register from MODRM reg
oprndtX, // DS:[eSI] for string instruction
oprndtY, // ES:[eDI] for string instruction
oprndtZ // DS:[eBX] for XLAT
);
_OPRND = packed record
opr_bits:Byte; // 6 MSB = OPRNDT, 2 LSB = OPREFT
bValue:Byte;
end;
_MODRMT = ( // MODRM type
modrmtNo, // Not present
modrmtYes, // Present
modrmtMem, // Memory only
modrmtReg // Register only
);
_ICB = ( // Immediate byte count
icbNil, // No immediate value
icbAP, // Far pointer
icbIb, // Immediate byte
icbIb0A, // Immediate byte (must be 0Ah)
icbIv, // Immediate operand size value
icbIw, // Immediate word
icbIw_Ib, // Immediate word and immediate byte
icbJb, // Byte displacement
icbJv, // Address size displacement
icbO // Address size value
);
_OPS = record
modrmt:_MODRMT;
icb:_ICB;
rgoprnd:Array[0..2] of _OPRND;
end;
_POPS = ^_OPS;
_OPCD = record
pvMnemonic:PAnsiChar;
pops:_POPS;
trmta:Byte;
end;
POPCD = ^_OPCD;
// C++ __thiscall virtual methods of TDIS
// Object reference is passed in ECX, arguments are pushed on the stack as __cdecl
// stack is cleaned by the virtual method, like in "stdcall"
{
p_AddrAddress = Function(adr:Integer):Int64 of object; // +$04
p_AddrJumpTable = Function:Int64 of object; // +$08
p_AddrOperand = Function(adr:Integer):Int64 of object; // +$0C
p_AddrTarget = Function:Int64 Of Object; // +$10
p_Cb = Function:Integer of Object; // +$14
p_CbDisassemble = Function(adr:Int64;Buf:PAnsiChar;BufLen:Integer):Integer of Object; // +$18
p_CbGenerateLoadAddress = Function(adr:Integer;Buf:PAnsiChar;BufLen:Integer;idx:Integer=0):Integer Of Object; // +$1C
p_CbJumpEntry = Function:Integer of Object; // +$20
p_CbOperand = Function(size:Integer):Integer Of Object; // +$24
p_CchFormatBytes = Function(Buf:PAnsiChar;BufLen:Integer):Integer of object; // +$28
p_CchFormatBytesMax = Function:Integer of object; // +$2C
p_Cinstruction = Function:Integer Of Object; // +$30
p_Coperand = Function:Integer of Object; // +$34
p_FormatAddr = Procedure(s:TStream;adr:Int64) of object; // +$38
p_FormatInstr = Procedure(s:TStream) of object; // +$3C
p_FSelectInstruction = Function(adr:Integer):Boolean Of object; // +$40
p_Memreft = Function(adr:Integer):MEMREF of object; // +$44
p_Trmt = Function:TRM of Object; // +$48
p_Trmta = Function:TRMA of Object; // +$4C
p_RegaMax = Function:REGA of object; // +$50
}
TDIS = class;
PFNCCHADDR = Function(obj:TDIS;adr:Int64;Buf:PAnsiChar;BufLen:Integer;ptr:PInt64):Integer; Stdcall;
PFNCCHCONST = Function(obj:TDIS;Idx:Cardinal;Buf:PAnsiChar;BufLen:Integer):Integer; Stdcall;
PFNCCHFIXUP = Function(obj:TDIS;adr:Int64;Idx:Integer;Buf:PAnsiChar;BufLen:Integer;ptr:PInt64):Integer; Stdcall;
PFNCCHREGREL = Function(obj:TDIS;r:REGA;Idx:Cardinal;Buf:PAnsiChar;BufLen:Integer;ptr:PInteger):Integer; Stdcall;
PFNCCHREG = Function(obj:TDIS;r:REGA;Buf:PAnsiChar;BufLen:Integer):Integer; Stdcall;
PFNDWGETREG = Function(obj:TDIS;r:REGA):Int64; Stdcall;
// C++ class from Microsoft Dis-assembler DLL
TDIS = Class
// ancestor Protected members
garbage:Cardinal; // +$4
m_dist:DisType; // +$8
m_pfncchaddr:PFNCCHADDR; // +$0C
m_pfncchconst:PFNCCHCONST; // +$10
m_pfncchfixup:PFNCCHFIXUP; // +$14
m_pfncchregrel:PFNCCHREGREL; // +$18
m_pfncchreg:PFNCCHREG; // +$1C
m_pfndwgetreg:PFNDWGETREG; // +$20
m_pvClient:PAnsiChar; // +$24
m_addr:Int64; // +$28
// private members
m_pbCur:Pointer; // +$30
m_cbMax:Integer; // +$34
m_cb:Integer; // +$38
m_rgbInstr:Array[0..15] Of Byte; // +$3C
m_popcd:POPCD; // +$4C
m_fAddress32:Boolean; // +$50
m_fOperand32:Boolean; // +$51
m_bSegOverride:Byte; // +$52
m_bPrefix:Byte; // +$53
m_fAddrOverride:Boolean; // +$54
m_fOperOverride:Boolean; // +$55
m_ibOp:Integer; // +$58
m_ibModrm:Integer; // +$5C
m_cbModrm:Integer; // +$60
m_ibImmed:Integer; // +$64
m_trmta:TRMTA; // +$68
//m_regmaskRd:REGMASK;
//m_regmaskWr:REGMASK;
procedure Dumm2; virtual; // +$0
Function AddrAddress(z:Cardinal;obj:TObject;adr:Integer):Int64; Virtual; // +$04
Function AddrJumpTable(z:Cardinal;obj:TObject):Int64; virtual; // +$08
function AddrOperand(z:Cardinal;obj:Tobject;adr:Integer):Int64; virtual; // +$0C
function AddrTarget(z:Cardinal;obj:TObject):Int64; virtual; // +$10
Function Cb(z:Cardinal;obj:TObject):Integer; virtual; // +$14
Function CbDisassemble(z:Cardinal;obj:TObject;BufLen:Integer;Buf:PAnsiChar;adr:Int64):Integer; virtual; // +$18
Function CbGenerateLoadAddress(z:Cardinal;obj:TObject;idx:Integer;BufLen:Integer;Buf:PAnsiChar;adr:Integer):Integer; virtual; // +$1C
Function CbJumpEntry(z:Cardinal;obj:TObject):Integer; virtual; // +$20
Function CbOperand(z:Cardinal;obj:TObject;size:Integer):Integer; virtual; // +$24
Function CchFormatBytes(z:Cardinal;obj:TObject;BufLen:Integer;Buf:PAnsiChar):Integer; virtual; // +$28
Function CchFormatBytesMax(z:Cardinal;obj:TObject):Integer; virtual; // +$2C
Function Cinstruction(z:Cardinal;obj:TObject):Integer; virtual; // +$30
Function Coperand(z:Cardinal;obj:TObject):Integer; virtual; // +$34
end;
TPdisNew = Function (a:Integer):TDIS; Stdcall;
TCchFormatAddr = Function (z1,z2:Cardinal;obj:TObject;BufLen:Integer;Buf:PAnsiChar;Adr:Int64):Integer; // __thiscall
TCchFormatInstr = Function (z1,z2:Cardinal;obj:TObject;BufLen:Integer;Buf:PAnsiChar):Integer; // __thiscall
//TDist = Function:Integer; Stdcall;
MDisasm=class
private
PDisNew:TPdisNew;
CChFormatAddr:TCchFormatAddr;
CChFormatInstr:TCchFormatInstr;
//Dist:TDist;
DIS:TDIS;
Function GetAddressSize:Boolean;
function GetOperandSize: Boolean;
Function GetSegPrefix:Byte;
Function GetRepPrefix:Byte;
Function GetPostByteMod:Byte;
function GetPostByteReg: Byte;
function GetPostByteRm: Byte;
function GetOpType(const Op:AnsiString): TOperType;
procedure FormatInstr(DisInfo:PDISINFO; disLine:PAnsiString);
procedure FormatArg(argno:Integer; cmd, arg:Integer; DisInfo:PDISINFO; disLine:PAnsiString);
function OutputGeneralRegister(var dst:AnsiString; reg, size:Integer): Integer;
Function GetAddress:Integer;
procedure OutputSegPrefix(var dst:AnsiString; DisInfo:PDISINFO);
Function EvaluateOperandSize:Integer;
procedure OutputSizePtr(size:Integer; mm:Boolean; DisInfo:PDISINFO; disLine:PAnsiString);
procedure OutputMemAdr16(argno:Integer; var dst:AnsiString; arg:Integer; f1, f2:Boolean; DisInfo:PDisInfo; disLine:PAnsiString);
procedure OutputMemAdr32(argno:Integer; var dst:AnsiString; arg:Integer; f1, f2:Boolean; DisInfo:PDisInfo; disLine:PAnsiString);
Public
hModule:HINST;
Destructor Destroy; Override;
function Init: Boolean;
function Disassemble(fromAdr:Integer; DisInfo:PDISINFO; disLine:PAnsiString): Integer; overload;
function Disassemble(from:PAnsiChar; address:Int64; DisInfo:PDISINFO; disLine:PAnsiString): Integer; overload;
Function GetRegister(reg:PAnsiChar):Integer;
Function GetOp(mnem:AnsiString):Byte;
Function GetCop:Byte;
Function GetCop1:Byte;
Function GetPostByte:Byte;
Procedure SetPostByte(b:BYTE);
Procedure SetOffset(ofs:Integer);
Procedure GetInstrBytes(dst:PByte);
function GetSizeString(size:Integer): AnsiString;
end;
Implementation
Uses SysUtils,Main,Misc,Math;
Destructor MDisasm.Destroy;
Begin
if hModule<>0 then FreeLibrary(hModule);
end;
Function MDisasm.Init:Boolean;
Begin
Result:=False;
hModule := LoadLibrary('dis.dll');
if hModule=0 then Exit;
PdisNew := GetProcAddress(hModule, '?PdisNew@DIS@@SGPAV1@W4DIST@1@@Z');
CchFormatAddr := GetProcAddress(hModule, '?CchFormatAddr@DIS@@QBEI_KPADI@Z');
CchFormatInstr := GetProcAddress(hModule, '?CchFormatInstr@DIS@@QBEIPADI@Z');
//Dist := GetProcAddress(hModule, '?Dist@DIS@@QBE?AW4DIST@1@XZ');
DIS := PdisNew(Ord(distX86));
Result:=True;
end;
function MDisasm.GetOp(mnem:AnsiString): Byte;
Begin
if (mnem = 'mov')or(mnem='movsx')or(mnem='movzx') then Result:=OP_MOV
Else If mnem='movs' then Result:=OP_MOVS
else if mnem = 'push' then Result:=OP_PUSH
else if mnem = 'pop' then Result:=OP_POP
else if mnem = 'jmp' then Result:= OP_JMP
else if mnem = 'xor' then Result:= OP_XOR
else if mnem = 'cmp' then Result:= OP_CMP
else if mnem = 'test' then Result:= OP_TEST
else if mnem = 'lea' then Result:= OP_LEA
else if mnem = 'add' then Result:= OP_ADD
else if mnem = 'sub' then Result:= OP_SUB
Else if mnem = 'or' then Result:= OP_OR
else if mnem = 'and' then Result:= OP_AND
else if mnem = 'inc' then Result:= OP_INC
else if mnem = 'dec' then Result:= OP_DEC
else if mnem = 'mul' then Result:= OP_MUL
Else if mnem = 'div' then Result:= OP_DIV
Else if mnem = 'imul' then Result:= OP_IMUL
Else if mnem = 'idiv' then Result:= OP_IDIV
Else if (mnem = 'shl')or(mnem = 'shld') then Result:= OP_SHL
Else if (mnem = 'shr')or(mnem = 'shrd') then Result:= OP_SHR
Else if mnem = 'sal' then Result:= OP_SAL
else if mnem = 'sar' then Result:= OP_SAR
else if mnem = 'neg' then Result:= OP_NEG
else if mnem = 'not' then Result:= OP_NOT
else if mnem = 'adc' then Result:= OP_ADC
else if mnem = 'sbb' then Result:= OP_SBB
Else if mnem = 'cdq' then Result:= OP_CDQ
else if mnem = 'xchg' then Result:= OP_XCHG
Else if mnem = 'bt' then Result:= OP_BT
Else if mnem = 'btc' then Result:= OP_BTC
Else if mnem = 'btr' then Result:= OP_BTR
else if mnem = 'bts' then Result:= OP_BTS
else if Copy(mnem,1,3) = 'set' then Result:= OP_SET
Else Result:=OP_UNK;
end;
Function MDisasm.GetOpType(const Op:AnsiString):TOperType;
Begin
if Op='' then Result:=otUND
else
begin
if Pos('[',Op)<>0 then Result:=otMEM
else if Op[1] in ['0'..'9','$','+','-'] then Result:=otIMM
Else if (Op[1] = 's') and (Op[2] = 't') then Result:=otFST
Else Result:=otREG;
end;
end;
Function MDisasm.GetRegister(reg:PAnsiChar):Integer;
var
n:Integer;
Begin
Result:=-1;
for n := Low(Reg32Tab) to High(Reg32Tab) do
if Reg32Tab[n]=reg Then
Begin
Result:=n;
Exit;
end;
end;
Function MDisasm.Disassemble(fromAdr:Integer; DisInfo:PDISINFO; disLine:PAnsiString):Integer;
var
a:Integer;
Begin
CrtSection.Enter;
a:=Adr2Pos(fromAdr);
if a<>0 then
result := Disassemble(Code + a, fromAdr, DisInfo, disLine)
else REsult:=0;
CrtSection.Leave;
end;
Function MDisasm.Disassemble(from:PAnsiChar; address:Int64; DisInfo:PDISINFO; disLine:PAnsiString):Integer;
var
InstrLen:Integer;
Begin
CrtSection.Enter;
InstrLen:=DIS.CbDisassemble(0,DIS,100,from,address);
//If address of structure DISINFO not given, return only instruction length
if Assigned(DisInfo) then
begin
if InstrLen<>0 then
begin
FillMemory(DisInfo, sizeof(TDisInfo),0);
with DisInfo^ do
begin
OpRegIdx[0] := -1;
OpRegIdx[1] := -1;
OpRegIdx[2] := -1;
BaseReg := -1;
IndxReg := -1;
RepPrefix := -1;
SegPrefix := -1;
end;
FormatInstr(DisInfo, disLine);
if (DisInfo.IndxReg <> -1) and (DisInfo.Scale=0) then DisInfo.Scale := 1;
if (DisInfo.Mnem[1] = 'f') or (DisInfo.Mnem = 'wait') then DisInfo.Float := true
else if DisInfo.Mnem[1] = 'j' then
begin
DisInfo.Branch := true;
if DisInfo.Mnem[2] <> 'm' then DisInfo.Conditional := true;
end
else if DisInfo.Mnem= 'call' then DisInfo.Call := true
else if DisInfo.Mnem= 'ret' then DisInfo.Ret := true;
Result:= InstrLen;
end
else Result:=0;
end
else Result:=InstrLen;
CrtSection.Leave;
end;
Procedure MDisasm.FormatInstr(DisInfo:PDISINFO; disLine:PAnsiString);
var
repPrefix:Byte;
OpName, ArgInfo:PAnsiChar;
i, Bytes:Integer;
Cmd, Arg:Integer;
Begin
Bytes:=0;
if Assigned(disLine) then disLine^ := '';
repPrefix := GetRepPrefix;
case repPrefix of
$F0:
begin
if Assigned(disLine) then disLine^:=disLine^+ 'lock ';
DisInfo.RepPrefix := 0;
Bytes := 5;
end;
$F2:
begin
if Assigned(disLine) then disLine^:=disLine^+ 'repne ';
DisInfo.RepPrefix := 1;
Bytes := 6;
end;
$F3:
begin
if (GetCop and $F6) = $A6 then
begin
if Assigned(disLine) then disLine^:=disLine^+ 'repe ';
DisInfo.RepPrefix := 2;
Bytes := 5;
end
else
begin
if Assigned(disLine) then disLine^:=disLine^+ 'rep ';
DisInfo.RepPrefix := 3;
Bytes := 4;
End;
end;
end;
OpName:=DIS.m_popcd.pvMnemonic;
if not GetOperandSize then
Case GetCop of
$60: OpName := 'pusha';
$61: OpName := 'popa';
$98: OpName := 'cbw';
$99: OpName := 'cwd';
$9C: OpName := 'pushf';
$9D: OpName := 'popf';
$CF: OpName := 'iret';
End;
if not GetAddressSize and (GetCop = $E3) then OpName := 'jcxz';
if Assigned(disLine) then disLine^:=disLine^+OpName;
DisInfo.Mnem:=OpName;
Inc(Bytes,Length(OpName));
ArgInfo:=PAnsiChar(@DIS.m_popcd.pops.modrmt)+SizeOf(_OPS)+1;
for i := 0 to 2 do
begin
if (ArgInfo=Nil) or (ArgInfo^=#0) then break;
if Assigned(disLine) then
begin
if i=0 then
begin
disLine^:=disLine^+StringOfChar(' ',ASMMAXCOPLEN-Bytes);
Bytes:=ASMMAXCOPLEN;
end
else disLine^:=disLine^+',';
End;
Cmd:=Byte(ArgInfo^);
Arg:=PWord(ArgInfo+1)^;
Inc(ArgInfo,4);
FormatArg(i, Cmd, Arg, DisInfo, disLine);
Inc(DisInfo.OpNum);
End;
end;
Function MDisasm.OutputGeneralRegister(var dst:AnsiString; reg, size:Integer):Integer;
Begin
if size = 1 then
begin
dst:=dst + Reg8Tab[reg];
Result:=0;
end
Else if size = 2 then
begin
dst:=dst + Reg16Tab[reg];
Result:=8;
end
else if (size <> 4) And not GetOperandSize then
begin
dst:=dst + Reg16Tab[reg];
Result:=8;
End
else
begin
dst:=dst + Reg32Tab[reg];
Result:=16;
end;
end;
Function MDisasm.GetAddress:Integer;
var
x:Int64;
Begin
Result:=0;
case DIS.m_trmta of
//0,1,2,3,7,8,9,17: Result:=0;
trmtaJmpShort,
trmtaJmpCcShort,
trmtaLoop,
trmtaJcxz:
Begin
x:=ShortInt(DIS.m_rgbInstr[DIS.m_ibImmed]) + DIS.m_cb + DIS.m_addr;
if not DIS.m_fOperand32 then x:=x and $FFFF;
if DIS.m_dist = distX8616 then x:=(x and $FFFF) or (Integer(DIS.m_addr) and $FFFF0000);
Result:=x;
end;
trmtaJmpNear,
trmtaJmpCcNear,
trmtaCallNear16,
trmtaCallNear32:
Begin
if DIS.m_fOperand32 Then x:=PInteger(@DIS.m_rgbInstr[DIS.m_ibImmed])^
Else x:=PSmallInt(@DIS.m_rgbInstr[DIS.m_ibImmed])^;
Inc(x,DIS.m_cb + DIS.m_addr);
if not DIS.m_fOperand32 then x:=x and $FFFF;
if DIS.m_dist = distX8616 then x:=(x and $FFFF) or (Integer(DIS.m_addr) and $FFFF0000);
Result:=x;
end;
trmtaJmpFar,
trmtaCallFar: Result:=PInteger(@DIS.m_rgbInstr[DIS.m_ibImmed])^;
end;
end;
Procedure MDisasm.OutputSegPrefix(var dst:AnsiString; DisInfo:PDISINFO);
Var
sptr:AnsiString;
Begin
sptr:='';
Case GetSegPrefix of
$26:
begin
sptr := 'es:';
DisInfo.SegPrefix := 0;
End;
$2E:
begin
sptr := 'cs:';
DisInfo.SegPrefix := 1;
end;
$36:
begin
sptr := 'ss:';
DisInfo.SegPrefix := 2;
end;
$3E:
begin
sptr := 'ds:';
DisInfo.SegPrefix := 3;
end;
$64:
begin
sptr := 'fs:';
DisInfo.SegPrefix := 4;
end;
$65:
begin
sptr := 'gs:';
DisInfo.SegPrefix := 5;
end;
end;
if sptr<>'' then dst:=dst + sptr;
end;
Function MDisasm.EvaluateOperandSize:Integer;
var
OperandSize:Boolean;
Ofs:Integer;
Begin
OperandSize := GetOperandSize;
Ofs:=PInteger(@DIS.m_popcd.pops)^;
if OperandSize then Result:=4 else Result:=2;
if (Ofs = $1041BB30) or //INVLPG, PREFETCH, PREFETCHW
(Ofs = $1041C370) then //LEA
Result:=0
else if (Ofs = $1041BC38) //BOUND
then Result:=2*Result
Else if (Ofs = $1041BCB0) or //CALL, JMP
(Ofs = $1041C3E8) then //LES, LDS, LSS, LFS, LGS
Result:=Result + 2
Else if (Ofs = $1041BC98) or //FLDENV
(Ofs = $1041C460) then //FNSTENV
if OperandSize then Result:=28 else Result:=14
else if (Ofs = $1041BCF8) or //FRSTOR
(Ofs = $1041C4C0) then //FNSAVE
if OperandSize then Result:=108 Else Result:=94;
end;
Function MDisasm.GetSizeString(size:Integer):AnsiString;
Begin
Result:='';
Case size of
1: Result:='byte';
2: Result:='word';
4: Result:='dword';
6: Result:='fword';
8: Result:='qword';
10: Result:='tbyte';
end;
end;
Procedure MDisasm.OutputSizePtr(size:Integer; mm:Boolean; DisInfo:PDISINFO; disLine:PAnsiString);
var
sptr:AnsiString;
Begin
sptr:='';
if size=0 then size := EvaluateOperandSize;
Case size of
1: sptr := 'byte';
2: sptr := 'word';
4: sptr := 'dword';
6: sptr := 'fword';
8: if mm then sptr := 'mmword' Else sptr := 'qword';
10: sptr := 'tbyte';
16: if mm then sptr := 'xmmword';
End;
if sptr<>'' then
begin
if Assigned(disLine) then disLine^:=disLine^ + sptr + ' ptr ';
DisInfo.OpSize := size;
DisInfo.sSize:=sptr;
End;
end;
Procedure MDisasm.OutputMemAdr32(argno:Integer; var dst:AnsiString; arg:Integer; f1, f2:Boolean; DisInfo:PDisInfo; disLine:PAnsiString);
var
PostByte, _mod, sib, b:Byte;
_pos:PAnsiChar;
ofs, ofs1, ib, mm:Boolean;
ss, index, base, idxofs:Integer;
offset32:Integer;
Begin
ss:=1;
PostByte:=DIS.m_rgbInstr[DIS.m_ibModrm];
_mod := PostByte and $C0;
base := PostByte and 7;
if _mod = $C0 then
begin
if not f1 and not f2 then
begin
//idxval := PostByte and 7;
idxofs := OutputGeneralRegister(dst, base, arg);
DisInfo.OpRegIdx[argno] := idxofs + base;
Exit;
End;
if f2 then dst:=dst + 'xmm' + IntToStr(base);
Exit;
End;
ofs := false;
index := -1;
_pos:=@DIS.m_rgbInstr[DIS.m_ibModrm+1];
if base <> 4 then
begin
if (PostByte and $C7) = 5 then //mod=00;r/m=101
begin
ofs := true;
base := -1;
End;
end
else //sib
begin
sib := Byte(_pos^);
Inc(_pos);
if ((sib and 7) = 5) and (_mod=0) Then base := - 1
else base := sib and 7;
index := (sib shr 3) and 7;
if index <> 4 then ss := 1 shl (sib shr 6)
else index := -1;
if ((sib and 7) = 5) and (_mod=0) then ofs := true;
End;
offset32 := 0;
if _mod = $40 then //mod=01
begin
b := Byte(_pos^);
offset32 := b;
if (b and $80) <> 0 then offset32:=offset32 or -256;
end
else if _mod = $80 then ofs:=true; //mod=10
if ofs then offset32 := PInteger(_pos)^;
mm := f1 or f2;
OutputSizePtr(arg, mm, DisInfo, disLine);
OutputSegPrefix(dst, DisInfo);
ib := (base <> -1) or (index <> -1);
if (GetSegPrefix=0) And not ib then
begin
DisInfo.SegPrefix := 3;
dst:=dst + 'ds:';
End;
dst:=dst + '[';
ofs1 := offset32 <> 0;
if ib then
begin
if base <> -1 then
begin
dst:=dst + Reg32Tab[base];
DisInfo.BaseReg := base + 16;
End;
if index <> -1 then
begin
if base <> -1 then dst:=dst + '+';
dst:=dst + Reg32Tab[index];
DisInfo.IndxReg := index + 16;
if ss <> 1 then
begin
dst:=dst + '*'+IntToStr(ss);
DisInfo.Scale := ss;
End;
End;
end
else ofs1 := true;
if ofs or ofs1 then
begin
DisInfo.Offset := offset32;
dst:=dst+OutputHex(offset32,True);
End;
dst:=dst + ']';
end;
Procedure MDisasm.OutputMemAdr16(argno:Integer; var dst:AnsiString; arg:Integer; f1, f2:Boolean; DisInfo:PDisInfo; disLine:PAnsiString);
var
PostByte, b,_mod:Byte;
ofs, mm:Boolean;
regcomb:AnsiString;
sign:Char;
idxofs:Integer;
offset16, dval:Integer;
Begin
offset16:=0;
PostByte:=DIS.m_rgbInstr[DIS.m_ibModrm];
b := PostByte and 7;
_mod:=PostByte and $C0;
if _mod = $C0 then //mod=11
begin
if Not f1 and not f2 then
begin
idxofs := OutputGeneralRegister(dst, b, arg);
DisInfo.OpRegIdx[argno] := idxofs + b;
Exit;
end;
if f2 then dst:=dst + 'xmm' + IntToStr(b);
Exit;
end;
ofs := false;
regcomb := '';
if (PostByte and $C7) = 6 then ofs:=true //mod=00;r/m=110
else
begin
regcomb := RegCombTab[b];
Case b Of
0,1,7: DisInfo.BaseReg := 11;
2,3,6: DisInfo.BaseReg := 13;
End;
case b of
0,2,4: DisInfo.IndxReg := 14;
1,3,5: DisInfo.IndxReg := 15;
End;
end;
sign := #0;
if _mod = $40 then //mod=01
Begin
offset16:= ShortInt(DIS.m_rgbInstr[DIS.m_ibModrm+1]);
sign:='+';
if offset16<0 Then
Begin
offset16:= - offset16;
sign:='-';
end;
end
else if _mod = $80 then ofs:=true; //mod=10
mm := f1 or f2;
OutputSizePtr(arg, mm, DisInfo, disLine);
OutputSegPrefix(dst, DisInfo);
if (GetSegPrefix=0) and (regcomb='') then
begin
dst:=dst + 'ds:';
DisInfo.SegPrefix := 3;
end;
dst:=dst + '[';
if regcomb<>'' then dst:=dst + regcomb;
if ofs then
begin
if regcomb<>'' then dst:=dst + '+';
dval:=PWord(@DIS.m_rgbInstr[DIS.m_ibModrm+1])^;
DisInfo.Offset := dval;
dst:=dst + OutputHex(dval,False,4);
end
else if sign<>#0 then
begin
DisInfo.Offset := offset16;
dst:=dst + OutputHex(offset16,True,0);
end;
dst:=dst+']';
end;
Procedure MDisasm.FormatArg(argno:Integer; cmd, arg:Integer; DisInfo:PDISINFO; disLine:PAnsiString);
Var
dval, adr:Integer;
idxofs, idxval, stno:Integer;
Op:AnsiString;
Begin
Op:='';
Case cmd of
1: //segment:offset
begin
if GetOperandSize then // 32-bit
begin
dval:=PWord(@DIS.m_rgbInstr[Dis.m_ibImmed+4])^;
Op:='$'+IntToHex(dval,4)+':';
dval:=PInteger(@DIS.m_rgbInstr[Dis.m_ibImmed])^;
Op:=Op+IntToHex(dval,8);
end
else // 16-bit
begin
dval:=PWord(@DIS.m_rgbInstr[DIS.m_ibImmed+2])^;
Op:='$'+IntToHex(dval,4)+':';
dval:=PWord(@DIS.m_rgbInstr[DIS.m_ibImmed])^;
Op:=Op+IntToHex(dval,4);
end;
end;
2: //cr#
Op:='cr'+IntToStr(GetPostByteReg);
3: //Integer value (sar, shr)
begin
Op:=IntToStr(arg);
DisInfo.Immediate := arg;
//DisInfo.ImmPresent := true;
end;
4: //dr#
Op:='dr'+IntToStr(GetPostByteReg);
5: //General register
begin
idxval := GetCop and 7;
idxofs := OutputGeneralRegister(Op, idxval, arg);
DisInfo.OpRegIdx[argno] := idxofs + idxval;
end;
6: //General register
begin
idxval := GetCop1 and 7;
idxofs := OutputGeneralRegister(Op, idxval, arg);
DisInfo.OpRegIdx[argno] := idxofs + idxval;
end;
7: //Immediate byte
begin
if GetCop = $83 then dval:=PShortInt(@DIS.m_rgbInstr[DIS.m_ibImmed])^ // signed
else dval:=PByte(@DIS.m_rgbInstr[DIS.m_ibImmed])^; // unsigned
DisInfo.Immediate := dval;
//DisInfo.ImmPresent := true;
Op:=OutputHex(dval,Boolean(IfThen(GetCop = $83,1)),2);
end;
8: //Immediate byte
begin
dval:=PByte(@DIS.m_rgbInstr[DIS.m_ibImmed+2])^;
DisInfo.Immediate := dval;
//DisInfo.ImmPresent := true;
Op:=OutputHex(dval,False,2);
end;
9: //Immediate dword
begin
if GetOperandSize then dval:=PInteger(@DIS.m_rgbInstr[DIS.m_ibImmed])^ // 32-bit
else dval:=PSmallInt(@DIS.m_rgbInstr[DIS.m_ibImmed])^; // 16-bit
DisInfo.Immediate := dval;
//DisInfo.ImmPresent := true;
Op:=OutputHex(dval,Boolean(IfThen(GetOp(DisInfo.Mnem)
in [OP_CMP,OP_ADD,OP_ADC,OP_SUB,OP_SBB,OP_MUL,OP_IMUL,OP_DIV,OP_IDIV],1)));
end;
10: //Immediate word (ret)
begin
dval:=PWord(@DIS.m_rgbInstr[DIS.m_ibImmed])^;
DisInfo.Immediate := dval;
//DisInfo.ImmPresent := true;
Op:=OutputHex(dval,False);
end;
11,12: //Address (jmp, jcond, call)
begin
adr := GetAddress;
DisInfo.Immediate := adr;
//DisInfo.ImmPresent := true;
Op:=OutputHex(adr,False,8);
end;
13,15,27: //Memory
if GetAddressSize then
OutputMemAdr32(argno, Op, arg, cmd = 13, cmd = 27, DisInfo, disLine)
else
OutputMemAdr16(argno, Op, arg, cmd = 13, cmd = 27, DisInfo, disLine);
14: //mm#
Op:='mm'+IntToStr(GetPostByteReg);
16: //General register
begin
idxval := GetPostByteReg;
idxofs := OutputGeneralRegister(Op, idxval, arg);
DisInfo.OpRegIdx[argno] := idxofs + idxval;
end;
17: //Segment register
begin
idxval := GetPostByteReg;
DisInfo.OpRegIdx[argno] := idxval + 24;
Op:=SegRegTab[idxval];
end;
18: //sreg:memory
begin
OutputSegPrefix(Op, DisInfo);
if GetAddressSize then dval:=PInteger(@DIS.m_rgbInstr[DIS.m_ibImmed])^ // 32-bit
else dval:=PWord(@DIS.m_rgbInstr[DIS.m_ibImmed])^; // 16-bit
Op:='['+OutputHex(dval,False)+']';
DisInfo.Offset := dval; //!
end;
19: //8-bit register
begin
Op:=Reg8Tab[arg];
DisInfo.OpRegIdx[argno] := arg;
end;
20: //General register
begin
idxval := arg;
idxofs := OutputGeneralRegister(Op, idxval, 0);
DisInfo.OpRegIdx[argno] := idxofs + idxval;
end;
21: //8-bit register
begin
Op:=Reg8Tab[arg];
DisInfo.OpRegIdx[argno] := arg;
end;
22: //st
begin
Op:='st';
DisInfo.OpRegIdx[argno] := 30;
end;
23: //st(#)
begin
stno := GetPostByteRm;
Op:='st('+IntToStr(stno)+')';
DisInfo.OpRegIdx[argno] := stno + 30;
end;
24: //Segment register
begin
Op:=SegRegTab[arg];
DisInfo.OpRegIdx[argno] := arg + 24;
end;
25: //tr#
Op:='tr'+IntToStr(GetPostByteReg);
26: //[esi] or [si]
begin
OutputSizePtr(arg, false, DisInfo, disLine);
OutputSegPrefix(Op, DisInfo);
if GetAddressSize then
begin
DisInfo.BaseReg := 22;
Op:='[esi]';
end
else
begin
DisInfo.BaseReg := 14;
Op:='[si]';
end;
end;
28: //xmm#
Op:='xmm'+IntToStr(GetPostByteReg);
29: //[edi] or es:[di]
begin
OutputSizePtr(arg, false, DisInfo, disLine);
if GetAddressSize then
begin
DisInfo.BaseReg := 23;
Op:='[edi]';
end
else
begin
DisInfo.SegPrefix := 0;
DisInfo.BaseReg := 15;
Op:='es:[di]';
End;
end;
30: //[ebx] or [bx]
begin
OutputSizePtr(1, false, DisInfo, disLine);
OutputSegPrefix(Op, DisInfo);
if GetAddressSize then
begin
DisInfo.BaseReg := 19;
Op:='[ebx]';
end
else
begin
DisInfo.BaseReg := 11;
Op:='[bx]';
End;
end;
End;
if argno = 0 then