RandomWOW/src/virtualMemory.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 "virtualMemory.hpp"
#include <stdexcept>
#ifdef _WIN32
#include <windows.h>
#else
#ifdef __APPLE__
#include <mach/vm_statistics.h>
#endif
#include <sys/types.h>
#include <sys/mman.h>
#ifndef MAP_ANONYMOUS
#define MAP_ANONYMOUS MAP_ANON
#endif
#endif
#ifdef _WIN32
std::string getErrorMessage(const char* function) {
LPSTR messageBuffer = nullptr;
size_t size = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPSTR)&messageBuffer, 0, NULL);
std::string message(messageBuffer, size);
LocalFree(messageBuffer);
return std::string(function) + std::string(": ") + message;
}
void setPrivilege(const char* pszPrivilege, BOOL bEnable) {
HANDLE hToken;
TOKEN_PRIVILEGES tp;
BOOL status;
DWORD error;
if (!OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken))
throw std::runtime_error(getErrorMessage("OpenProcessToken"));
if (!LookupPrivilegeValue(NULL, pszPrivilege, &tp.Privileges[0].Luid))
throw std::runtime_error(getErrorMessage("LookupPrivilegeValue"));
tp.PrivilegeCount = 1;
if (bEnable)
tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
else
tp.Privileges[0].Attributes = 0;
status = AdjustTokenPrivileges(hToken, FALSE, &tp, 0, (PTOKEN_PRIVILEGES)NULL, 0);
error = GetLastError();
if (!status || (error != ERROR_SUCCESS))
throw std::runtime_error(getErrorMessage("AdjustTokenPrivileges"));
if (!CloseHandle(hToken))
throw std::runtime_error(getErrorMessage("CloseHandle"));
}
#endif
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void* allocExecutableMemory(std::size_t bytes) {
void* mem;
#ifdef _WIN32
mem = VirtualAlloc(nullptr, bytes, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
if (mem == nullptr)
throw std::runtime_error(getErrorMessage("allocExecutableMemory - VirtualAlloc"));
#else
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mem = mmap(nullptr, bytes, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (mem == MAP_FAILED)
throw std::runtime_error("allocExecutableMemory - mmap failed");
#endif
return mem;
}
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constexpr std::size_t align(std::size_t pos, uint32_t align) {
return ((pos - 1) / align + 1) * align;
}
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void* allocLargePagesMemory(std::size_t bytes) {
void* mem;
#ifdef _WIN32
setPrivilege("SeLockMemoryPrivilege", 1);
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mem = VirtualAlloc(NULL, align(bytes, 2 * 1024 * 1024), MEM_COMMIT | MEM_RESERVE | MEM_LARGE_PAGES, PAGE_READWRITE);
if (mem == nullptr)
throw std::runtime_error(getErrorMessage("allocLargePagesMemory - VirtualAlloc"));
#else
#ifdef __APPLE__
mem = mmap(nullptr, bytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, VM_FLAGS_SUPERPAGE_SIZE_2MB, 0);
#else
mem = mmap(nullptr, bytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB | MAP_POPULATE, -1, 0);
#endif
if (mem == MAP_FAILED)
throw std::runtime_error("allocLargePagesMemory - mmap failed");
#endif
return mem;
}
void freePagedMemory(void* ptr, std::size_t bytes) {
#ifdef _WIN32
VirtualFree(ptr, 0, MEM_RELEASE);
#else
munmap(ptr, bytes);
#endif
}