public override bool MatchJump(EndianImageReader rdr, uint opcode, out uint target)
{
if (opcode == 0xE9 // JMP NEAR
&&
rdr.IsValidOffset(rdr.Offset + 3u))
{
int callOffset = rdr.PeekLeInt16(1);
target = (uint)(callOffset + (uint)rdr.Address.ToLinear() + 3);
return(true);
}
if (0x70 <= opcode && opcode <= 0x7F && // short branch.
rdr.IsValidOffset(rdr.Offset + 1u))
{
sbyte callOffset = rdr.PeekSByte(1);
target = (uint)((uint)rdr.Address.ToLinear() + callOffset + 2);
return(true);
}
if (opcode == 0x0F && rdr.IsValidOffset(rdr.Offset + 4u))
{
opcode = rdr.PeekByte(1);
int callOffset = rdr.PeekLeInt16(2);
uint linAddr = (uint)rdr.Address.ToLinear();
if (0x80 <= opcode && opcode <= 0x8F) // long branch
{
target = (uint)(callOffset + linAddr + 4);
return(true);
}
}
if (opcode == 0xEA // JMP FAR
&&
rdr.IsValidOffset(rdr.Offset + 5u))
{
ushort jmpOffset = rdr.PeekLeUInt16(1);
ushort jmpSeg = rdr.PeekLeUInt16(3);
target = ((uint)jmpSeg << 4) + jmpOffset;
return(true);
}
target = 0;
return(false);
}
public override bool MatchCall(EndianImageReader rdr, uint opcode, out uint target)
{
if (opcode == 0xE8 // CALL NEAR
&&
rdr.IsValidOffset(rdr.Offset + 2u))
{
int callOffset = rdr.PeekLeInt16(1);
target = (uint)(callOffset + (uint)rdr.Address.ToLinear() + 3);
return(true);
}
if (opcode == 0x9A // CALL FAR
&&
rdr.IsValidOffset(rdr.Offset + 5u))
{
ushort callOff = rdr.PeekLeUInt16(1);
ushort callSeg = rdr.PeekLeUInt16(3);
target = ((uint)callSeg << 4) + callOff;
return(true);
}
target = 0;
return(false);
}
