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608d481e6b
2001-01-21 Franz Sirl <Franz.Sirl-kernel@lauterbach.com> * sysdeps/unix/sysv/linux/powerpc/mmap64.c: Correctly mask offset. 2001-01-21 Ulrich Drepper <drepper@redhat.com> * malloc/malloc.c: Remove a few unnecessary initializers of global variables.
83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/* Copyright (C) 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@redhat.com>, 1999.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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#include <bp-checks.h>
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#include "kernel-features.h"
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/* This is always the constant 12 for this routine, even if the actual
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page size is larger. */
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#define PAGE_SHIFT 12
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#ifdef __NR_mmap2
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extern void *__unbounded __syscall_mmap2(void *__unbounded, size_t,
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int, int, int, off_t);
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#ifndef __ASSUME_MMAP2_SYSCALL
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static int have_no_mmap2;
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#endif
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#endif
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__ptr_t
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__mmap64 (__ptr_t addr, size_t len, int prot, int flags, int fd, off64_t offset)
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{
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#ifdef __NR_mmap2
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if (
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# ifndef __ASSUME_MMAP2_SYSCALL
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! have_no_mmap2 &&
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# endif
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! (offset & ((1 << PAGE_SHIFT)-1)))
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{
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# ifndef __ASSUME_MMAP2_SYSCALL
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int saved_errno = errno;
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# endif
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__ptr_t result;
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__ptrvalue (result) = INLINE_SYSCALL (mmap2, 6, __ptrvalue (addr), len, prot,
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flags, fd, (off_t) (offset >> PAGE_SHIFT));
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# if __BOUNDED_POINTERS__
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__ptrlow (result) = __ptrvalue (result);
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__ptrhigh (result) = __ptrvalue (result) + len;
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# endif
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# ifndef __ASSUME_MMAP2_SYSCALL
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if (result != (__ptr_t) -1 || errno != ENOSYS)
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# endif
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return result;
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# ifndef __ASSUME_MMAP2_SYSCALL
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__set_errno (saved_errno);
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have_no_mmap2 = 1;
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# endif
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}
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#endif
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if (offset != (off_t) offset || (offset + len) != (off_t) (offset + len))
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{
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__set_errno (EINVAL);
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return MAP_FAILED;
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}
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return __mmap (addr, len, prot, flags, fd, (off_t) offset);
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}
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weak_alias (__mmap64, mmap64)
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