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134 lines
4.6 KiB
134 lines
4.6 KiB
/*
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Copyright (c) 2018-2019, tevador <tevador@gmail.com>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the copyright holder nor the
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names of its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "virtual_memory.hpp"
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#include <stdexcept>
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#ifdef _WIN32
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#include <windows.h>
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#else
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#ifdef __APPLE__
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#include <mach/vm_statistics.h>
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#endif
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#include <sys/types.h>
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#include <sys/mman.h>
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#ifndef MAP_ANONYMOUS
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#define MAP_ANONYMOUS MAP_ANON
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#endif
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#endif
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#ifdef _WIN32
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std::string getErrorMessage(const char* function) {
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LPSTR messageBuffer = nullptr;
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size_t size = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
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NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPSTR)&messageBuffer, 0, NULL);
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std::string message(messageBuffer, size);
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LocalFree(messageBuffer);
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return std::string(function) + std::string(": ") + message;
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}
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void setPrivilege(const char* pszPrivilege, BOOL bEnable) {
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HANDLE hToken;
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TOKEN_PRIVILEGES tp;
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BOOL status;
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DWORD error;
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if (!OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken))
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throw std::runtime_error(getErrorMessage("OpenProcessToken"));
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if (!LookupPrivilegeValue(NULL, pszPrivilege, &tp.Privileges[0].Luid))
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throw std::runtime_error(getErrorMessage("LookupPrivilegeValue"));
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tp.PrivilegeCount = 1;
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if (bEnable)
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tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
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else
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tp.Privileges[0].Attributes = 0;
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status = AdjustTokenPrivileges(hToken, FALSE, &tp, 0, (PTOKEN_PRIVILEGES)NULL, 0);
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error = GetLastError();
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if (!status || (error != ERROR_SUCCESS))
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throw std::runtime_error(getErrorMessage("AdjustTokenPrivileges"));
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if (!CloseHandle(hToken))
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throw std::runtime_error(getErrorMessage("CloseHandle"));
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}
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#endif
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void* allocExecutableMemory(std::size_t bytes) {
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void* mem;
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#ifdef _WIN32
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mem = VirtualAlloc(nullptr, bytes, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
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if (mem == nullptr)
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throw std::runtime_error(getErrorMessage("allocExecutableMemory - VirtualAlloc"));
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#else
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mem = mmap(nullptr, bytes, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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if (mem == MAP_FAILED)
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throw std::runtime_error("allocExecutableMemory - mmap failed");
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#endif
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return mem;
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}
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constexpr std::size_t align(std::size_t pos, std::size_t align) {
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return ((pos - 1) / align + 1) * align;
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}
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void* allocLargePagesMemory(std::size_t bytes) {
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void* mem;
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#ifdef _WIN32
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setPrivilege("SeLockMemoryPrivilege", 1);
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auto pageMinimum = GetLargePageMinimum();
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if (pageMinimum > 0)
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mem = VirtualAlloc(NULL, align(bytes, pageMinimum), MEM_COMMIT | MEM_RESERVE | MEM_LARGE_PAGES, PAGE_READWRITE);
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else
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throw std::runtime_error("allocLargePagesMemory - Large pages are not supported");
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if (mem == nullptr)
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throw std::runtime_error(getErrorMessage("allocLargePagesMemory - VirtualAlloc"));
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#else
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#ifdef __APPLE__
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mem = mmap(nullptr, bytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, VM_FLAGS_SUPERPAGE_SIZE_2MB, 0);
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#else
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mem = mmap(nullptr, bytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB | MAP_POPULATE, -1, 0);
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#endif
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if (mem == MAP_FAILED)
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throw std::runtime_error("allocLargePagesMemory - mmap failed");
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#endif
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return mem;
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}
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void freePagedMemory(void* ptr, std::size_t bytes) {
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#ifdef _WIN32
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VirtualFree(ptr, 0, MEM_RELEASE);
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#else
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munmap(ptr, bytes);
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#endif
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}
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