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(libretro-common) Include preliminary memmap.c

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twinaphex 2015-08-12 15:27:20 +02:00
parent 1ed7c4ef37
commit 7031582b22
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41
libretro-common/include/memmap.h Normal file
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/* Copyright (C) 2010-2015 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (memmap.h).
* ---------------------------------------------------------------------------------------
*
* Permission is hereby granted, free of charge,
* to any person obtaining a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef _LIBRETRO_MEMMAP_H
#define _LIBRETRO_MEMMAP_H
#if defined(__CELLOS_LV2__) || defined(PSP) || defined(GEKKO) || defined(VITA) || defined(_XBOX)
/* No mman available */
#elif defined(_WIN32) && !defined(_XBOX)
#include <windows.h>
#include <errno.h>
#include <io.h>
#else
#define HAVE_MMAP
#include <sys/mman.h>
#endif
#ifndef MAP_ANONYMOUS
#define MAP_ANONYMOUS MAP_ANON
#endif
#endif

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libretro-common/memmap/memmap.c Normal file
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/* Copyright (C) 2010-2015 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (memmap.c).
* ---------------------------------------------------------------------------------------
*
* Permission is hereby granted, free of charge,
* to any person obtaining a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <memmap.h>
#ifdef _WIN32
#define MAP_SHARED 0x01
#define MAP_PRIVATE 0x02
#define MAP_ANONYMOUS 0x20
#define MAP_ANON MAP_ANONYMOUS
#define MAP_FAILED ((void *) -1)
#define PROT_READ 0x1
#define PROT_WRITE 0x2
/* This flag is only available in WinXP+ */
#ifdef FILE_MAP_EXECUTE
#define PROT_EXEC 0x4
#else
#define PROT_EXEC 0x0
#define FILE_MAP_EXECUTE 0
#endif
#ifdef __USE_FILE_OFFSET64
# define DWORD_HI(x) (x >> 32)
# define DWORD_LO(x) ((x) & 0xffffffff)
#else
# define DWORD_HI(x) (0)
# define DWORD_LO(x) (x)
#endif
static void *mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
{
uint32_t flProtect, dwDesiredAccess;
off_t end;
HANDLE mmap_fd, h;
void *ret;
if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC))
return MAP_FAILED;
if (fd == -1)
{
if (!(flags & MAP_ANON) || offset)
return MAP_FAILED;
}
else if (flags & MAP_ANON)
return MAP_FAILED;
if (prot & PROT_WRITE)
{
flProtect = PAGE_READWRITE;
if (prot & PROT_EXEC)
flProtect = PAGE_EXECUTE_READWRITE;
}
else if (prot & PROT_EXEC)
{
flProtect = PAGE_EXECUTE;
if (prot & PROT_READ)
flProtect = PAGE_EXECUTE_READ;
}
else
flProtect = PAGE_READONLY;
end = length + offset;
if (fd == -1)
mmap_fd = INVALID_HANDLE_VALUE;
else
mmap_fd = (HANDLE)_get_osfhandle(fd);
h = CreateFileMapping(mmap_fd, NULL, flProtect, DWORD_HI(end), DWORD_LO(end), NULL);
if (h == NULL)
return MAP_FAILED;
dwDesiredAccess = FILE_MAP_READ;
if (prot & PROT_WRITE)
dwDesiredAccess = FILE_MAP_WRITE;
if (prot & PROT_EXEC)
dwDesiredAccess |= FILE_MAP_EXECUTE;
if (flags & MAP_PRIVATE)
dwDesiredAccess |= FILE_MAP_COPY;
ret = MapViewOfFile(h, dwDesiredAccess, DWORD_HI(offset), DWORD_LO(offset), length);
if (ret == NULL)
{
CloseHandle(h);
ret = MAP_FAILED;
}
return ret;
}
static void munmap(void *addr, size_t length)
{
UnmapViewOfFile(addr);
/* ruh-ro, we leaked handle from CreateFileMapping() ... */
}
#elif !defined(HAVE_MMAP)
#define PROT_EXEC 0x04
#define MAP_FAILED 0
#define PROT_READ 0
#define PROT_WRITE 0
#define MAP_PRIVATE 0
#define MAP_ANONYMOUS 0
void* mmap(void *desired_addr, size_t len, int mmap_prot, int mmap_flags, int fildes, size_t off)
{
return malloc(len);
}
void munmap(void *base_addr, size_t len)
{
free(base_addr);
}
int mprotect(void *addr, size_t len, int prot)
{
/* stub - not really needed at this point since this codepath has no dynarecs */
return 0;
}
#endif