74 lines
2.2 KiB
ArmAsm
74 lines
2.2 KiB
ArmAsm
/*-
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* Copyright (c) 2002 Peter Grehan.
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* $NetBSD: brk.S,v 1.9 2000/06/26 06:25:43 kleink Exp $ */
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#include <machine/asm.h>
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__FBSDID("$FreeBSD$");
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#include "SYS.h"
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.globl HIDENAME(curbrk)
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.globl HIDENAME(minbrk)
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.globl CNAME(_end)
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.data
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.align 3
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HIDENAME(minbrk):
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.llong CNAME(_end)
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.text
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ENTRY(brk)
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addis %r6,%r2,HIDENAME(minbrk)@toc@ha
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ld %r6,HIDENAME(minbrk)@toc@l(%r6)
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cmpld %r6,%r3 /* if (minbrk <= r3) */
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bgt 0f
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mr %r6,%r3 /* r6 = r3 */
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0:
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mr %r3,%r6 /* new break value */
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li %r0,SYS_break
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sc /* assume, that r5 is kept */
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bso 1f
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/* record new break */
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addis %r7,%r2,HIDENAME(curbrk)@toc@ha
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std %r6,HIDENAME(curbrk)@toc@l(%r7)
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blr /* return 0 */
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1:
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mflr %r0
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std %r0,16(%r1)
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stdu %r1,-48(%r1)
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bl HIDENAME(cerror)
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nop
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ld %r1,0(%r1)
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ld %r0,16(%r1)
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mtlr %r0
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blr
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.section .note.GNU-stack,"",%progbits
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