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92 lines
2.5 KiB
ArmAsm
92 lines
2.5 KiB
ArmAsm
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/* Copyright (C) 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 <sysdep.h>
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#include "kernel-features.h"
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#include <asm/errno.h>
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/* Rather than dragging in yet another kernel file, <asm/page.h>, we
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define it here. Provide for easy override. */
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#ifndef PAGE_SHIFT
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#define PAGE_SHIFT 13
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#endif
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/* This is: __ptr_t
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__mmap64 (__ptr_t addr, size_t len, int prot, int flags, int fd,
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off64_t offset); */
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/* This was done in C, but the resulting code didn't look anywhere near
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nice, and mmap64 is important enough to have fast code. Rather than
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fixing (the generic bits in) gcc, we make sure not to depend on it by
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writing code that GCC cannot reasonably generate. */
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.syntax no_register_prefix
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ENTRY (__mmap64)
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move [sp],mof
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move.d [sp+4],r9
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/* Only accept an offset being a multiple of PAGE_SIZE, ditto address. */
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btstq (PAGE_SHIFT - 1),r9
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bne 1f
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lsrq PAGE_SHIFT,r9
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btstq (PAGE_SHIFT - 1),r10
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bne 1f
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move.d r9,[sp]
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/* We have to store the adjusted part somewhere we can "or" from.
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No registers available, so let's re-use the incoming low-part
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parameter location. */
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move.d [sp+8],r9
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swapwbr r9
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/* Check if the highest bits (now the lowest bits) are zero. They
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must be, since we're actually calling a system function
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specifying the size in *pages* in a single dword. Thus you can
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mmap64 PAGE_SIZE * 4 Gbyte. */
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btstq (PAGE_SHIFT - 1),r9
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bne 1f
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swapwbr r9
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lslq (32 - PAGE_SHIFT),r9
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or.d [sp],r9
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move srp,[sp]
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move r9,srp
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movu.b SYS_ify (mmap2),r9
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break 13
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cmps.w -4096,r10
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bhs 0f
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move [sp],srp
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Ret
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nop
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/* Local error handler. */
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1:
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movs.w -EINVAL,r10
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/* Drop through into the ordinary error handler. */
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PSEUDO_END (__mmap64)
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weak_alias (__mmap64, mmap64)
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