/* * 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