94 lines
2.6 KiB
ArmAsm
94 lines
2.6 KiB
ArmAsm
/* $OpenBSD: brk.S,v 1.15 2023/12/10 16:45:51 deraadt Exp $ */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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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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#include "SYS.h"
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.globl _end
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.globl __curbrk
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.data
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.align 8
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__minbrk:
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.long _end
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END(__minbrk)
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.type __minbrk,@object
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.weak brk
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ENTRY(brk)
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#ifdef __PIC__
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PIC_SAVE(%r9)
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PIC_SETUP
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#endif
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#ifdef __PIC__
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PIC_LOAD(%r5,__minbrk)
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#else
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or.u %r5,%r0,%hi16(__minbrk)
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ld %r5,%r5,%lo16(__minbrk)
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#endif
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cmp %r3,%r5,%r2
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bb1 ls,%r3,1f /* r2 should be > minbrk; can't go below end */
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or %r2,%r5,0 /* otherwise, set r2 to minbrk */
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1:
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or %r4,%r2,0
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or %r13,%r0,__SYSCALLNAME(SYS_,break)
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99: tb0 0,%r0,450
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PINSYSCALL(SYS_break, 99b)
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#ifdef __PIC__
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br 9f
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#else
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br CERROR
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#endif
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#ifdef __PIC__
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PIC_STORE(%r4,__curbrk)
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#else
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or.u %r5,%r0,%hi16(__curbrk)
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st %r4,%r5,%lo16(__curbrk)
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#endif
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or %r2,%r0,0 /* clear r2/r3 to indicate success */
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#ifdef __PIC__
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PIC_RESTORE(%r9)
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#endif
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jmp.n %r1
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or %r3,%r0,0
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#ifdef __PIC__
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9:
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br.n CERROR
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PIC_RESTORE(%r9)
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#endif
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END(brk)
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