zydis/VerteronDisassemblerEngine/VXDisassemblerUtils.c

74 lines
2.6 KiB
C

/**************************************************************************************************
Verteron Disassembler Engine
Version 1.0
Remarks : Freeware, Copyright must be included
Original Author : Florian Bernd
Modifications : athre0z
Last change : 13. March 2015
* 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 "VXDisassemblerUtils.h"
#include <assert.h>
uint64_t VXCalcAbsoluteTarget(const VXInstructionInfo *info, const VXOperandInfo *operand)
{
assert((operand->type == OPTYPE_REL_IMMEDIATE) ||
((operand->type == OPTYPE_MEMORY) && (operand->base == REG_RIP)));
uint64_t truncMask = 0xFFFFFFFFFFFFFFFFull;
if (!(info->flags & IF_DISASSEMBLER_MODE_64))
{
truncMask >>= (64 - info->operand_mode);
}
uint16_t size = operand->size;
if ((operand->type == OPTYPE_MEMORY) && (operand->base == REG_RIP))
{
size = operand->offset;
}
switch (size)
{
case 8:
return (info->instrPointer + operand->lval.sbyte) & truncMask;
case 16:
{
uint32_t delta = operand->lval.sword & truncMask;
if ((info->instrPointer + delta) > 0xFFFF)
{
return (info->instrPointer & 0xF0000) + ((info->instrPointer + delta) & 0xFFFF);
}
return info->instrPointer + delta;
}
case 32:
return (info->instrPointer + operand->lval.sdword) & truncMask;
default:
assert(0);
}
return 0;
}