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/*
* Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
*
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
/* Massivly hacked up for uClibc by Erik Andersen */
#include <_lfs_64.h>
#include <stdint.h>
#include <sys/syscall.h>
#include <errno.h>
#include <sys/mman.h>
#ifndef __NR_mmap2
/*
* This version is a stub that just chops off everything at the mmap 32 bit
* mmap() address space... You will probably need to add in an arch specific
* implementation to override this as there is not a generic way for me to
* implement this particular syscall if your arch lacks _syscall6...
*
*/
void *mmap64(void *addr, size_t len, int prot, int flags, int fd, __off64_t offset)
{
if (offset != (off_t) offset ||
(offset + len) != (off_t) (offset + len)) {
__set_errno(EINVAL);
return MAP_FAILED;
}
return mmap(addr, len, prot, flags, fd, (off_t) offset);
}
#else
# include <bits/uClibc_page.h>
/* Some architectures always use 12 as page shift for mmap2() even though the
* real PAGE_SHIFT != 12. Other architectures use the same value as
* PAGE_SHIFT...
*/
# ifndef MMAP2_PAGE_SHIFT
# define MMAP2_PAGE_SHIFT 12
# endif
void *mmap64(void *addr, size_t len, int prot, int flags, int fd, __off64_t offset)
{
/*
* Some arches check the size in INLINE_SYSCALL() and barf if it's
* too big (i.e. a 64bit value getting truncated to 32bit).
*/
# if __WORDSIZE == 32
uint32_t sysoff;
# else
uint64_t sysoff;
# endif
if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1)) {
__set_errno(EINVAL);
return MAP_FAILED;
}
/*
* We know __off64_t is always a signed 64-bit type, but need things
* to be unsigned before doing the shift. If it isn't, we might
* sign extend things and pass in the wrong value. So cast it to
* an unsigned 64-bit value before doing the shift.
*/
sysoff = (uint64_t)offset >> MMAP2_PAGE_SHIFT;
return (void*) INLINE_SYSCALL(mmap2, 6, addr, len, prot, flags, fd, sysoff);
}
#endif
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