RandomWOW/src/virtual_machine.cpp

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/*
Copyright (c) 2018 tevador
This file is part of RandomX.
RandomX is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
RandomX is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with RandomX. If not, see<http://www.gnu.org/licenses/>.
*/
#include <cstring>
#include <iomanip>
#include <stdexcept>
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#include "virtual_machine.hpp"
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#include "common.hpp"
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#include "aes_hash.hpp"
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#include "blake2/blake2.h"
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#include "intrin_portable.h"
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#include "allocator.hpp"
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randomx_vm::~randomx_vm() {
}
void randomx_vm::resetRoundingMode() {
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rx_reset_float_state();
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}
namespace randomx {
static inline uint64_t getSmallPositiveFloatBits(uint64_t entropy) {
auto exponent = entropy >> 59; //0..31
auto mantissa = entropy & mantissaMask;
exponent += exponentBias;
exponent &= exponentMask;
exponent <<= mantissaSize;
return exponent | mantissa;
}
static inline uint64_t getStaticExponent(uint64_t entropy) {
auto exponent = constExponentBits;
exponent |= (entropy >> (64 - staticExponentBits)) << dynamicExponentBits;
exponent <<= mantissaSize;
return exponent;
}
static inline uint64_t getFloatMask(uint64_t entropy) {
constexpr uint64_t mask22bit = (1ULL << 22) - 1;
return (entropy & mask22bit) | getStaticExponent(entropy);
}
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}
void randomx_vm::initialize() {
store64(&reg.a[0].lo, randomx::getSmallPositiveFloatBits(program.getEntropy(0)));
store64(&reg.a[0].hi, randomx::getSmallPositiveFloatBits(program.getEntropy(1)));
store64(&reg.a[1].lo, randomx::getSmallPositiveFloatBits(program.getEntropy(2)));
store64(&reg.a[1].hi, randomx::getSmallPositiveFloatBits(program.getEntropy(3)));
store64(&reg.a[2].lo, randomx::getSmallPositiveFloatBits(program.getEntropy(4)));
store64(&reg.a[2].hi, randomx::getSmallPositiveFloatBits(program.getEntropy(5)));
store64(&reg.a[3].lo, randomx::getSmallPositiveFloatBits(program.getEntropy(6)));
store64(&reg.a[3].hi, randomx::getSmallPositiveFloatBits(program.getEntropy(7)));
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mem.ma = program.getEntropy(8) & randomx::CacheLineAlignMask;
mem.mx = program.getEntropy(10);
auto addressRegisters = program.getEntropy(12);
config.readReg0 = 0 + (addressRegisters & 1);
addressRegisters >>= 1;
config.readReg1 = 2 + (addressRegisters & 1);
addressRegisters >>= 1;
config.readReg2 = 4 + (addressRegisters & 1);
addressRegisters >>= 1;
config.readReg3 = 6 + (addressRegisters & 1);
datasetOffset = (program.getEntropy(13) & randomx::DatasetExtraItems) * randomx::CacheLineSize;
store64(&config.eMask[0], randomx::getFloatMask(program.getEntropy(14)));
store64(&config.eMask[1], randomx::getFloatMask(program.getEntropy(15)));
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}
namespace randomx {
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alignas(16) volatile static rx_vec_i128 aesDummy;
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template<class Allocator, bool softAes>
VmBase<Allocator, softAes>::~VmBase() {
Allocator::freeMemory(scratchpad, ScratchpadSize);
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}
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template<class Allocator, bool softAes>
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void VmBase<Allocator, softAes>::allocate() {
if (datasetPtr == nullptr)
throw std::invalid_argument("Cache/Dataset not set");
if (!softAes) { //if hardware AES is not supported, it's better to fail now than to return a ticking bomb
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rx_vec_i128 tmp = rx_load_vec_i128((const rx_vec_i128*)&aesDummy);
tmp = rx_aesenc_vec_i128(tmp, tmp);
rx_store_vec_i128((rx_vec_i128*)&aesDummy, tmp);
}
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scratchpad = (uint8_t*)Allocator::allocMemory(ScratchpadSize);
}
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template<class Allocator, bool softAes>
void VmBase<Allocator, softAes>::getFinalResult(void* out, size_t outSize) {
hashAes1Rx4<softAes>(scratchpad, ScratchpadSize, &reg.a);
blake2b(out, outSize, &reg, sizeof(RegisterFile), nullptr, 0);
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}
template<class Allocator, bool softAes>
void VmBase<Allocator, softAes>::initScratchpad(void* seed) {
fillAes1Rx4<softAes>(seed, ScratchpadSize, scratchpad);
}
template<class Allocator, bool softAes>
void VmBase<Allocator, softAes>::generateProgram(void* seed) {
fillAes1Rx4<softAes>(seed, sizeof(program), &program);
}
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template class VmBase<AlignedAllocator<CacheLineSize>, false>;
template class VmBase<AlignedAllocator<CacheLineSize>, true>;
template class VmBase<LargePageAllocator, false>;
template class VmBase<LargePageAllocator, true>;
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}