mirror of
https://github.com/hrydgard/ppsspp.git
synced 2024-11-23 13:30:02 +00:00
91 lines
2.6 KiB
C++
91 lines
2.6 KiB
C++
// Copyright (C) 2003 Dolphin Project.
|
|
|
|
// This program 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, version 2.0 or later versions.
|
|
|
|
// This program 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 2.0 for more details.
|
|
|
|
// A copy of the GPL 2.0 should have been included with the program.
|
|
// If not, see http://www.gnu.org/licenses/
|
|
|
|
// Official SVN repository and contact information can be found at
|
|
// http://code.google.com/p/dolphin-emu/
|
|
|
|
#pragma once
|
|
|
|
#ifndef _WIN32
|
|
#include <sys/mman.h>
|
|
#endif
|
|
#include <stdint.h>
|
|
|
|
// Returns true if we need to avoid setting both writable and executable at the same time (W^X)
|
|
bool PlatformIsWXExclusive();
|
|
|
|
#define MEM_PROT_READ 1
|
|
#define MEM_PROT_WRITE 2
|
|
#define MEM_PROT_EXEC 4
|
|
|
|
// Note that some platforms go through special contortions to allocate executable memory. So for memory
|
|
// that's intended for execution, allocate it first using AllocateExecutableMemory, then modify protection as desired.
|
|
// AllocateMemoryPages is simpler and more generic. Note that on W^X platforms, this will return executable but not writable
|
|
// memory!
|
|
void* AllocateExecutableMemory(size_t size);
|
|
void* AllocateMemoryPages(size_t size, uint32_t memProtFlags);
|
|
// Note that on platforms returning PlatformIsWXExclusive, you cannot set a page to be both readable and writable at the same time.
|
|
bool ProtectMemoryPages(const void* ptr, size_t size, uint32_t memProtFlags);
|
|
void FreeMemoryPages(void* ptr, size_t size);
|
|
|
|
// Regular aligned memory. Don't try to apply memory protection willy-nilly to memory allocated this way as in-page alignment is unknown (though could be checked).
|
|
void* AllocateAlignedMemory(size_t size, size_t alignment);
|
|
void FreeAlignedMemory(void* ptr);
|
|
|
|
int GetMemoryProtectPageSize();
|
|
|
|
template <typename T>
|
|
class SimpleBuf {
|
|
public:
|
|
SimpleBuf() : buf_(0), size_(0) {
|
|
}
|
|
|
|
SimpleBuf(size_t size) : buf_(0) {
|
|
resize(size);
|
|
}
|
|
|
|
~SimpleBuf() {
|
|
if (buf_ != 0) {
|
|
FreeMemoryPages(buf_, size_ * sizeof(T));
|
|
}
|
|
}
|
|
|
|
inline T &operator[](size_t index) {
|
|
return buf_[index];
|
|
}
|
|
|
|
// Doesn't preserve contents.
|
|
void resize(size_t size) {
|
|
if (size_ < size) {
|
|
if (buf_ != 0) {
|
|
FreeMemoryPages(buf_, size_ * sizeof(T));
|
|
}
|
|
buf_ = (T *)AllocateMemoryPages(size * sizeof(T), MEM_PROT_READ | MEM_PROT_WRITE);
|
|
size_ = size;
|
|
}
|
|
}
|
|
|
|
T *data() {
|
|
return buf_;
|
|
}
|
|
|
|
size_t size() const {
|
|
return size_;
|
|
}
|
|
|
|
private:
|
|
T *buf_;
|
|
size_t size_;
|
|
};
|