zydis/Zydis/ZydisUtils.cpp

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/***************************************************************************************************
Zyan Disassembler Engine
Version 1.0
Remarks : Freeware, Copyright must be included
Original Author : Florian Bernd
Modifications : Joel H<EFBFBD>ner
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
***************************************************************************************************/
#include "ZydisUtils.hpp"
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#include <cassert>
namespace Zydis
{
uint64_t CalcAbsoluteTarget(const InstructionInfo& info, const OperandInfo& operand)
{
assert((operand.type == OperandType::REL_IMMEDIATE) ||
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((operand.type == OperandType::MEMORY) && (operand.base == Register::RIP)));
uint64_t truncMask = 0xFFFFFFFFFFFFFFFFull;
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if (!(info.flags & IF_DISASSEMBLER_MODE_64))
{
truncMask >>= (64 - info.operand_mode);
}
uint16_t size = operand.size;
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if ((operand.type == OperandType::MEMORY) && (operand.base == Register::RIP))
{
size = operand.offset;
}
switch (size)
{
case 8:
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return (info.instrPointer + operand.lval.sbyte) & truncMask;
case 16:
{
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uint32_t delta = operand.lval.sword & truncMask;
if ((info.instrPointer + delta) > 0xFFFF)
{
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return (info.instrPointer& 0xF0000) + ((info.instrPointer + delta) & 0xFFFF);
}
return info.instrPointer + delta;
}
case 32:
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return (info.instrPointer + operand.lval.sdword) & truncMask;
default:
assert(0);
}
return 0;
}
}