61 lines
2.6 KiB
ArmAsm
61 lines
2.6 KiB
ArmAsm
/* $NetBSD: modsi3.S,v 1.1 2002/03/26 22:49:32 fredette Exp $ */
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/*-
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* Copyright (c) 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matthew Fredette.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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RCSID("$NetBSD: modsi3.S,v 1.1 2002/03/26 22:49:32 fredette Exp $");
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#endif /* LIBC_SCCS and not lint */
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ENTRY(__modsi3)
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| NB: this requires that __udivsi3 preserve %a0 and return
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| the modulus in %d1:
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movel %sp@+, %a0 | pop return address
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movel %sp@(4), %d1 | load the divisor
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bpl 1f
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negl %sp@(4) | store abs(divisor)
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1: movel %sp@, %d0 | load the dividend
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pea %pc@(Lret) | push our return address
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bpl 2f
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negl %sp@(4) | store abs(dividend)
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subql #2, %sp@ | adjust return address
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2: jmp _C_LABEL(__udivsi3)
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negl %d1 | negate modulus
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Lret: movl %d1, %d0 | move modulus into %d0
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jmp %a0@
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