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/* Copyright (C) 2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <sysdep.h>
#include "kernel-features.h"
#include <asm/errno.h>
/* Rather than dragging in yet another kernel file, <asm/page.h>, we
define it here. Provide for easy override. */
#ifndef PAGE_SHIFT
#define PAGE_SHIFT 13
#endif
/* This is: __ptr_t
__mmap64 (__ptr_t addr, size_t len, int prot, int flags, int fd,
off64_t offset); */
/* This was done in C, but the resulting code didn't look anywhere near
nice, and mmap64 is important enough to have fast code. Rather than
fixing (the generic bits in) gcc, we make sure not to depend on it by
writing code that GCC cannot reasonably generate. */
.syntax no_register_prefix
ENTRY (__mmap64)
move [sp],mof
move.d [sp+4],r9
/* Only accept an offset being a multiple of PAGE_SIZE, ditto address. */
btstq (PAGE_SHIFT - 1),r9
bne 1f
lsrq PAGE_SHIFT,r9
btstq (PAGE_SHIFT - 1),r10
bne 1f
move.d r9,[sp]
/* We have to store the adjusted part somewhere we can "or" from.
No registers available, so let's re-use the incoming low-part
parameter location. */
move.d [sp+8],r9
swapwbr r9
/* Check if the highest bits (now the lowest bits) are zero. They
must be, since we're actually calling a system function
specifying the size in *pages* in a single dword. Thus you can
mmap64 PAGE_SIZE * 4 Gbyte. */
btstq (PAGE_SHIFT - 1),r9
bne 1f
swapwbr r9
lslq (32 - PAGE_SHIFT),r9
or.d [sp],r9
move srp,[sp]
move r9,srp
movu.b SYS_ify (mmap2),r9
break 13
cmps.w -4096,r10
bhs 0f
move [sp],srp
Ret
nop
/* Local error handler. */
1:
movs.w -EINVAL,r10
/* Drop through into the ordinary error handler. */
PSEUDO_END (__mmap64)
weak_alias (__mmap64, mmap64)
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