forked from OSchip/llvm-project
129 lines
3.0 KiB
C
129 lines
3.0 KiB
C
/*
|
|
* This code is derived from uClibc (original license follows).
|
|
* https://git.uclibc.org/uClibc/tree/utils/mmap-windows.c
|
|
*/
|
|
/* mmap() replacement for Windows
|
|
*
|
|
* Author: Mike Frysinger <vapier@gentoo.org>
|
|
* Placed into the public domain
|
|
*/
|
|
|
|
/* References:
|
|
* CreateFileMapping: http://msdn.microsoft.com/en-us/library/aa366537(VS.85).aspx
|
|
* CloseHandle: http://msdn.microsoft.com/en-us/library/ms724211(VS.85).aspx
|
|
* MapViewOfFile: http://msdn.microsoft.com/en-us/library/aa366761(VS.85).aspx
|
|
* UnmapViewOfFile: http://msdn.microsoft.com/en-us/library/aa366882(VS.85).aspx
|
|
*/
|
|
|
|
#if defined(_WIN32)
|
|
|
|
#include "WindowsMMap.h"
|
|
#include "InstrProfiling.h"
|
|
|
|
#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
|
|
|
|
COMPILER_RT_VISIBILITY
|
|
void *mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
|
|
{
|
|
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;
|
|
|
|
DWORD flProtect;
|
|
if (prot & PROT_WRITE) {
|
|
if (prot & PROT_EXEC)
|
|
flProtect = PAGE_EXECUTE_READWRITE;
|
|
else
|
|
flProtect = PAGE_READWRITE;
|
|
} else if (prot & PROT_EXEC) {
|
|
if (prot & PROT_READ)
|
|
flProtect = PAGE_EXECUTE_READ;
|
|
else if (prot & PROT_EXEC)
|
|
flProtect = PAGE_EXECUTE;
|
|
} else
|
|
flProtect = PAGE_READONLY;
|
|
|
|
off_t end = length + offset;
|
|
HANDLE mmap_fd, h;
|
|
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;
|
|
|
|
DWORD dwDesiredAccess;
|
|
if (prot & PROT_WRITE)
|
|
dwDesiredAccess = FILE_MAP_WRITE;
|
|
else
|
|
dwDesiredAccess = FILE_MAP_READ;
|
|
if (prot & PROT_EXEC)
|
|
dwDesiredAccess |= FILE_MAP_EXECUTE;
|
|
if (flags & MAP_PRIVATE)
|
|
dwDesiredAccess |= FILE_MAP_COPY;
|
|
void *ret = MapViewOfFile(h, dwDesiredAccess, DWORD_HI(offset), DWORD_LO(offset), length);
|
|
if (ret == NULL) {
|
|
CloseHandle(h);
|
|
ret = MAP_FAILED;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
COMPILER_RT_VISIBILITY
|
|
void munmap(void *addr, size_t length)
|
|
{
|
|
UnmapViewOfFile(addr);
|
|
/* ruh-ro, we leaked handle from CreateFileMapping() ... */
|
|
}
|
|
|
|
COMPILER_RT_VISIBILITY
|
|
int msync(void *addr, size_t length, int flags)
|
|
{
|
|
if (flags & MS_INVALIDATE)
|
|
return -1; /* Not supported. */
|
|
|
|
/* Exactly one of MS_ASYNC or MS_SYNC must be specified. */
|
|
switch (flags & (MS_ASYNC | MS_SYNC)) {
|
|
case MS_SYNC:
|
|
case MS_ASYNC:
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
if (!FlushViewOfFile(addr, length))
|
|
return -1;
|
|
|
|
if (flags & MS_SYNC) {
|
|
/* FIXME: No longer have access to handle from CreateFileMapping(). */
|
|
/*
|
|
* if (!FlushFileBuffers(h))
|
|
* return -1;
|
|
*/
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
COMPILER_RT_VISIBILITY
|
|
int flock(int fd, int operation)
|
|
{
|
|
return -1; /* Not supported. */
|
|
}
|
|
|
|
#undef DWORD_HI
|
|
#undef DWORD_LO
|
|
|
|
#endif /* _WIN32 */
|