forked from dolphin-emu/dolphin
7afc53c3a1
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@1879 8ced0084-cf51-0410-be5f-012b33b47a6e
136 lines
3.0 KiB
C++
136 lines
3.0 KiB
C++
// Copyright (C) 2003-2008 Dolphin Project.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, version 2.0.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official SVN repository and contact information can be found at
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// http://code.google.com/p/dolphin-emu/
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#include "Common.h"
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#include "MemoryUtil.h"
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#ifdef _WIN32
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#include <windows.h>
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#elif __GNUC__
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#include <sys/mman.h>
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#include <errno.h>
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#include <stdio.h>
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#endif
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#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
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#define MAP_ANONYMOUS MAP_ANON
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#endif
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// MacOSX does not support MAP_VARIABLE
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#ifndef MAP_VARIABLE
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#define MAP_VARIABLE 0
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#endif
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// This is purposedely not a full wrapper for virtualalloc/mmap, but it
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// provides exactly the primitive operations that Dolphin needs.
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void* AllocateExecutableMemory(size_t size, bool low)
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{
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#ifdef _WIN32
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void* ptr = VirtualAlloc(0, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
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if ((u64)ptr >= 0x80000000)
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{
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PanicAlert("Executable memory ended up above 2GB!");
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// If this happens, we have to implement a free ram search scheme. ector knows how.
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}
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return(ptr);
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#else
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void* retval = mmap(0, size, PROT_READ | PROT_WRITE | PROT_EXEC,
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MAP_ANONYMOUS | MAP_PRIVATE
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#ifdef __x86_64__
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| (low ? MAP_32BIT : 0)
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#endif
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, -1, 0); // | MAP_FIXED
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// printf("Mapped executable memory at %p (size %i)\n", retval, size);
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if (!retval)
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{
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PanicAlert("Failed to allocate executable memory, errno=%i", errno);
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}
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return(retval);
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#endif
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}
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void* AllocateMemoryPages(size_t size)
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{
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#ifdef _WIN32
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void* ptr = VirtualAlloc(0, size, MEM_COMMIT, PAGE_READWRITE);
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if (!ptr)
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{
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PanicAlert("Failed to allocate raw memory");
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}
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return(ptr);
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#else
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void* retval = mmap(0, size, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); // | MAP_FIXED
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// printf("Mapped memory at %p (size %i)\n", retval, size);
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if (!retval)
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{
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PanicAlert("Failed to allocate raw memory, errno=%i", errno);
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}
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return(retval);
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#endif
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}
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void FreeMemoryPages(void* ptr, size_t size)
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{
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#ifdef _WIN32
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if (ptr)
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{
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VirtualFree(ptr, 0, MEM_RELEASE);
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ptr = NULL;
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}
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#else
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munmap(ptr, size);
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#endif
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}
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void WriteProtectMemory(void* ptr, size_t size, bool allowExecute)
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{
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#ifdef _WIN32
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VirtualProtect(ptr, size, allowExecute ? PAGE_EXECUTE_READ : PAGE_READONLY, 0);
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#else
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mprotect(ptr, size, allowExecute ? (PROT_READ | PROT_EXEC) : PROT_READ);
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#endif
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}
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void UnWriteProtectMemory(void* ptr, size_t size, bool allowExecute)
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{
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#ifdef _WIN32
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VirtualProtect(ptr, size, allowExecute ? PAGE_EXECUTE_READWRITE : PAGE_READONLY, 0);
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#else
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mprotect(ptr, size, allowExecute ? (PROT_READ | PROT_WRITE | PROT_EXEC) : PROT_WRITE | PROT_READ);
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#endif
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}
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