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(memmap) Create wrapper functions memprotect and memsync

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This commit is contained in:
twinaphex 2015-08-12 15:45:15 +02:00
parent 7031582b22
commit 7f615fc781
2 changed files with 53 additions and 8 deletions
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14
libretro-common/include/memmap.h
View file

@ -30,7 +30,7 @@
#include <errno.h>
#include <io.h>
#else
#define HAVE_MMAP
#define HAVE_MMAN
#include <sys/mman.h>
#endif
@ -38,4 +38,16 @@
#define MAP_ANONYMOUS MAP_ANON
#endif
#if !defined(HAVE_MMAN)
void* mmap(void *desired_addr, size_t len, int mmap_prot, int mmap_flags, int fildes, size_t off);
void munmap(void *base_addr, size_t len);
int mprotect(void *addr, size_t len, int prot);
#endif
int memsync(void *start, void *end);
int memprotect(void *addr, size_t len);
#endif

47
libretro-common/memmap/memmap.c
View file

@ -113,13 +113,24 @@ 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
static int mprotect(void *addr, size_t len, int prot)
{
/* Incomplete, just assumes PAGE_EXECUTE_READWRITE right now
* instead of correctly handling prot */
prot = 0;
if (prot & (PROT_READ | PROT_WRITE | PROT_EXEC))
prot = PAGE_EXECUTE_READWRITE;
return VirtualProtect(addr, len, prot, 0);
}
#elif !defined(HAVE_MMAN)
#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)
{
@ -139,3 +150,25 @@ int mprotect(void *addr, size_t len, int prot)
#endif
int memsync(void *start, void *end)
{
size_t len = (char*)end - (char*)start;
(void)len;
#if defined(__MACH__) && defined(__arm__)
sys_dcache_flush(start ,len);
sys_icache_invalidate(start, len);
return 0;
#elif defined(__arm__) && !defined(__QNX__)
__clear_cache(start, end);
return 0;
#elif defined(HAVE_MMAN)
return msync(start, len, MS_SYNC | MS_CACHE_ONLY | MS_INVALIDATE_ICACHE);
#else
return 0;
#endif
}
int memprotect(void *addr, size_t len)
{
return mprotect(addr, len, PROT_READ | PROT_WRITE | PROT_EXEC);
}