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author | Twinaphex | 2020-02-08 16:24:22 +0100 |
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committer | GitHub | 2020-02-08 16:24:22 +0100 |
commit | 0adc619b5a5705d16cc6caea64951776ababbb96 (patch) | |
tree | fbae9b1d18d04d8e7908aa1c3446782ebf6e8785 /deps/mman/mman.c | |
parent | 0204c39a68a1fd4bf667aa8ece5a769f2983b7d0 (diff) | |
parent | 6f1edc3c7fd1f7f58155107d0c99d0ac7d22443b (diff) | |
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Merge pull request #377 from pcercuei/libretro
Lightrec dynarec
Diffstat (limited to 'deps/mman/mman.c')
-rw-r--r-- | deps/mman/mman.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/deps/mman/mman.c b/deps/mman/mman.c new file mode 100644 index 0000000..e71666c --- /dev/null +++ b/deps/mman/mman.c @@ -0,0 +1,185 @@ + +#include <windows.h> +#include <errno.h> +#include <io.h> + +#include "mman.h" + +#ifndef FILE_MAP_EXECUTE +#define FILE_MAP_EXECUTE 0x0020 +#endif /* FILE_MAP_EXECUTE */ + +static int __map_mman_error(const DWORD err, const int deferr) +{ + if (err == 0) + return 0; + //TODO: implement + return err; +} + +static DWORD __map_mmap_prot_page(const int prot) +{ + DWORD protect = 0; + + if (prot == PROT_NONE) + return protect; + + if ((prot & PROT_EXEC) != 0) + { + protect = ((prot & PROT_WRITE) != 0) ? + PAGE_EXECUTE_READWRITE : PAGE_EXECUTE_READ; + } + else + { + protect = ((prot & PROT_WRITE) != 0) ? + PAGE_READWRITE : PAGE_READONLY; + } + + return protect; +} + +static DWORD __map_mmap_prot_file(const int prot) +{ + DWORD desiredAccess = 0; + + if (prot == PROT_NONE) + return desiredAccess; + + if ((prot & PROT_READ) != 0) + desiredAccess |= FILE_MAP_READ; + if ((prot & PROT_WRITE) != 0) + desiredAccess |= FILE_MAP_WRITE; + if ((prot & PROT_EXEC) != 0) + desiredAccess |= FILE_MAP_EXECUTE; + + return desiredAccess; +} + +void* mmap(void *addr, size_t len, int prot, int flags, int fildes, OffsetType off) +{ + HANDLE fm, h; + + void * map = MAP_FAILED; + +#ifdef _MSC_VER +#pragma warning(push) +#pragma warning(disable: 4293) +#endif + + const DWORD dwFileOffsetLow = (sizeof(OffsetType) <= sizeof(DWORD)) ? + (DWORD)off : (DWORD)(off & 0xFFFFFFFFL); + const DWORD dwFileOffsetHigh = (sizeof(OffsetType) <= sizeof(DWORD)) ? + (DWORD)0 : (DWORD)((off >> 32) & 0xFFFFFFFFL); + const DWORD protect = __map_mmap_prot_page(prot); + const DWORD desiredAccess = __map_mmap_prot_file(prot); + + const OffsetType maxSize = off + (OffsetType)len; + + const DWORD dwMaxSizeLow = (sizeof(OffsetType) <= sizeof(DWORD)) ? + (DWORD)maxSize : (DWORD)(maxSize & 0xFFFFFFFFL); + const DWORD dwMaxSizeHigh = (sizeof(OffsetType) <= sizeof(DWORD)) ? + (DWORD)0 : (DWORD)((maxSize >> 32) & 0xFFFFFFFFL); + +#ifdef _MSC_VER +#pragma warning(pop) +#endif + + errno = 0; + + if (len == 0 + /* Usupported protection combinations */ + || prot == PROT_EXEC) + { + errno = EINVAL; + return MAP_FAILED; + } + + h = ((flags & MAP_ANONYMOUS) == 0) ? + (HANDLE)_get_osfhandle(fildes) : INVALID_HANDLE_VALUE; + + if ((flags & MAP_ANONYMOUS) == 0 && h == INVALID_HANDLE_VALUE) + { + errno = EBADF; + return MAP_FAILED; + } + + fm = CreateFileMapping(h, NULL, protect, dwMaxSizeHigh, dwMaxSizeLow, NULL); + + if (fm == NULL) + { + errno = __map_mman_error(GetLastError(), EPERM); + return MAP_FAILED; + } + + if ((flags & MAP_FIXED) == 0) + { + map = MapViewOfFile(fm, desiredAccess, dwFileOffsetHigh, dwFileOffsetLow, len); + } + else + { + map = MapViewOfFileEx(fm, desiredAccess, dwFileOffsetHigh, dwFileOffsetLow, len, addr); + } + + CloseHandle(fm); + + if (map == NULL) + { + errno = __map_mman_error(GetLastError(), EPERM); + return MAP_FAILED; + } + + return map; +} + +int munmap(void *addr, size_t len) +{ + if (UnmapViewOfFile(addr)) + return 0; + + errno = __map_mman_error(GetLastError(), EPERM); + + return -1; +} + +int _mprotect(void *addr, size_t len, int prot) +{ + DWORD newProtect = __map_mmap_prot_page(prot); + DWORD oldProtect = 0; + + if (VirtualProtect(addr, len, newProtect, &oldProtect)) + return 0; + + errno = __map_mman_error(GetLastError(), EPERM); + + return -1; +} + +int msync(void *addr, size_t len, int flags) +{ + if (FlushViewOfFile(addr, len)) + return 0; + + errno = __map_mman_error(GetLastError(), EPERM); + + return -1; +} + +int mlock(const void *addr, size_t len) +{ + if (VirtualLock((LPVOID)addr, len)) + return 0; + + errno = __map_mman_error(GetLastError(), EPERM); + + return -1; +} + +int munlock(const void *addr, size_t len) +{ + if (VirtualUnlock((LPVOID)addr, len)) + return 0; + + errno = __map_mman_error(GetLastError(), EPERM); + + return -1; +} |