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89 lines
2.1 KiB
C++
89 lines
2.1 KiB
C++
#include "stdafx.h"
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#include "Utilities/Log.h"
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#include "VirtualMemory.h"
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#ifdef _WIN32
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#include <Windows.h>
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#else
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/types.h>
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#endif
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namespace utils
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{
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// Convert memory protection (internal)
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static auto operator +(protection prot)
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{
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#ifdef _WIN32
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DWORD _prot = PAGE_NOACCESS;
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switch (prot)
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{
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case protection::rw: _prot = PAGE_READWRITE; break;
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case protection::ro: _prot = PAGE_READONLY; break;
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case protection::no: break;
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case protection::wx: _prot = PAGE_EXECUTE_READWRITE; break;
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case protection::rx: _prot = PAGE_EXECUTE_READ; break;
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}
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#else
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int _prot = PROT_NONE;
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switch (prot)
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{
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case protection::rw: _prot = PROT_READ | PROT_WRITE; break;
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case protection::ro: _prot = PROT_READ; break;
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case protection::no: break;
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case protection::wx: _prot = PROT_READ | PROT_WRITE | PROT_EXEC; break;
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case protection::rx: _prot = PROT_READ | PROT_EXEC; break;
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}
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#endif
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return _prot;
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}
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void* memory_reserve(std::size_t size, void* use_addr)
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{
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#ifdef _WIN32
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return ::VirtualAlloc(use_addr, size, MEM_RESERVE, PAGE_NOACCESS);
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#else
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auto ptr = ::mmap(use_addr, size, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);
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if (use_addr && ptr != use_addr)
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{
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::munmap(ptr, size);
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return nullptr;
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}
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return ptr;
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#endif
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}
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void memory_commit(void* pointer, std::size_t size, protection prot)
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{
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#ifdef _WIN32
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verify(HERE), ::VirtualAlloc(pointer, size, MEM_COMMIT, +prot);
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#else
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verify(HERE), ::mprotect((void*)((u64)pointer & -4096), ::align(size, 4096), +prot) != -1;
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#endif
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}
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void memory_decommit(void* pointer, std::size_t size)
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{
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#ifdef _WIN32
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verify(HERE), ::VirtualFree(pointer, 0, MEM_DECOMMIT);
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#else
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verify(HERE), ::mmap(pointer, size, PROT_NONE, MAP_FIXED | MAP_ANON | MAP_PRIVATE, -1, 0);
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#endif
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}
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void memory_protect(void* pointer, std::size_t size, protection prot)
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{
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#ifdef _WIN32
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DWORD old;
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verify(HERE), ::VirtualProtect(pointer, size, +prot, &old);
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#else
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verify(HERE), ::mprotect((void*)((u64)pointer & -4096), ::align(size, 4096), +prot) != -1;
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#endif
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}
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}
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