99 lines
3.1 KiB
ArmAsm
99 lines
3.1 KiB
ArmAsm
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/* $NetBSD: brk.S,v 1.15 2008/11/06 13:42:55 nakayama Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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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. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* from: Header: brk.s,v 1.3 92/06/25 12:56:05 mccanne Exp
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*/
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#include <machine/asm.h>
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#if defined(SYSLIBC_SCCS) && !defined(lint)
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#if 0
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.asciz "@(#)brk.s 8.1 (Berkeley) 6/4/93"
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#else
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RCSID("$NetBSD: brk.S,v 1.15 2008/11/06 13:42:55 nakayama Exp $")
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#endif
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#endif /* SYSLIBC_SCCS and not lint */
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#include "SYS.h"
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.globl CURBRK
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.globl _C_LABEL(__minbrk)
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.globl _end
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#ifdef WEAK_ALIAS
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WEAK_ALIAS(brk, _brk)
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#endif
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.data
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_C_LABEL(__minbrk):
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.long _end ! lower brk limit; also for gmon code
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.text
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ENTRY(_brk)
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#ifdef PIC
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PIC_PROLOGUE(%o5,%o4)
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set _C_LABEL(__minbrk), %o4
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ld [%o5 + %o4], %o4
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ld [%o4], %o1 ! %o1 = minbrk
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cmp %o1, %o0 ! if (minbrk > %o0)
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bgu,a 0f
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mov %o1, %o0 ! %o0 = minbrk
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0:
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mov %o0, %o2 ! save argument to syscall
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mov SYS_break, %g1
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t ST_SYSCALL
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set CURBRK, %o3
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bcc,a 1f
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ld [%o5 + %o3], %o4
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ERROR()
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1:
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retl ! success, return 0 & record new break
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st %o2, [%o4]
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#else
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sethi %hi(_C_LABEL(__minbrk)), %o1 ! %o1 = minbrk
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ld [%o1 + %lo(_C_LABEL(__minbrk))], %o1
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cmp %o1, %o0 ! if (minbrk > %o0)
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bgu,a 0f
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mov %o1, %o0 ! %o0 = minbrk
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0:
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mov %o0, %o2 ! save argument to syscall
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mov SYS_break, %g1
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t ST_SYSCALL
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bcc,a 1f
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sethi %hi(CURBRK), %g1
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ERROR()
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1:
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retl ! success, return 0 & record new break
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st %o2, [%g1 + %lo(CURBRK)]
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#endif
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