mirror of https://github.com/x64dbg/zydis
142 lines
5.8 KiB
C
142 lines
5.8 KiB
C
/***************************************************************************************************
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Zyan Disassembler Library (Zydis)
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Original Author : Florian Bernd
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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***************************************************************************************************/
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#include <Zydis/Utils.h>
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/* ============================================================================================== */
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/* Address calculation */
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/* ============================================================================================== */
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/* ---------------------------------------------------------------------------------------------- */
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/* Exported functions */
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/* ---------------------------------------------------------------------------------------------- */
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ZydisStatus ZydisCalcAbsoluteAddress(const ZydisDecodedInstruction* instruction,
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const ZydisDecodedOperand* operand, ZydisU64* address)
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{
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if (!instruction || !operand || !address)
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{
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return ZYDIS_STATUS_INVALID_PARAMETER;
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}
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switch (operand->type)
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{
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case ZYDIS_OPERAND_TYPE_MEMORY:
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if (!operand->mem.disp.hasDisplacement)
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{
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return ZYDIS_STATUS_INVALID_PARAMETER;
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}
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if (operand->mem.base == ZYDIS_REGISTER_EIP)
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{
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*address =
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(ZydisU64)((ZydisU32)instruction->instrPointer + (ZydisU32)operand->mem.disp.value);
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return ZYDIS_STATUS_SUCCESS;
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}
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if (operand->mem.base == ZYDIS_REGISTER_RIP)
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{
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*address = (ZydisU64)(instruction->instrPointer + operand->mem.disp.value);
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return ZYDIS_STATUS_SUCCESS;
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}
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if ((operand->mem.base == ZYDIS_REGISTER_NONE) &&
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(operand->mem.index == ZYDIS_REGISTER_NONE))
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{
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switch (instruction->addressWidth)
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{
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case 16:
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*address = (ZydisU64)operand->mem.disp.value & 0x000000000000FFFF;
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return ZYDIS_STATUS_SUCCESS;
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case 32:
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*address = (ZydisU64)operand->mem.disp.value & 0x00000000FFFFFFFF;
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return ZYDIS_STATUS_SUCCESS;
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case 64:
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*address = (ZydisU64)operand->mem.disp.value;
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return ZYDIS_STATUS_SUCCESS;
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default:
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return ZYDIS_STATUS_INVALID_PARAMETER;
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}
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}
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break;
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case ZYDIS_OPERAND_TYPE_IMMEDIATE:
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if (operand->imm.isSigned && operand->imm.isRelative)
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{
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*address = (ZydisU64)((ZydisI64)instruction->instrPointer + operand->imm.value.s);
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switch (instruction->machineMode)
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{
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case ZYDIS_MACHINE_MODE_LONG_COMPAT_16:
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case ZYDIS_MACHINE_MODE_LEGACY_16:
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case ZYDIS_MACHINE_MODE_REAL_16:
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case ZYDIS_MACHINE_MODE_LONG_COMPAT_32:
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case ZYDIS_MACHINE_MODE_LEGACY_32:
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if (operand->size == 16)
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{
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*address &= 0xFFFF;
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}
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break;
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case ZYDIS_MACHINE_MODE_LONG_64:
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break;
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default:
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return ZYDIS_STATUS_INVALID_PARAMETER;
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}
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return ZYDIS_STATUS_SUCCESS;
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}
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break;
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default:
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break;
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}
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return ZYDIS_STATUS_INVALID_PARAMETER;
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}
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/* ---------------------------------------------------------------------------------------------- */
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/* ============================================================================================== */
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/* Flags */
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/* ============================================================================================== */
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/* ---------------------------------------------------------------------------------------------- */
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/* Exported functions */
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/* ---------------------------------------------------------------------------------------------- */
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ZydisStatus ZydisGetAccessedFlagsByAction(const ZydisDecodedInstruction* instruction,
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ZydisCPUFlagAction action, ZydisCPUFlagMask* flags)
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{
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if (!instruction)
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{
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return ZYDIS_STATUS_INVALID_PARAMETER;
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}
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*flags = 0;
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for (ZydisU8 i = 0; i < ZYDIS_ARRAY_SIZE(instruction->accessedFlags); ++i)
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{
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if (instruction->accessedFlags[i].action == action)
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{
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*flags |= (1 << i);
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}
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}
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return ZYDIS_STATUS_SUCCESS;
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}
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/* ---------------------------------------------------------------------------------------------- */
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/* ============================================================================================== */
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