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73 lines
2.3 KiB
ArmAsm
73 lines
2.3 KiB
ArmAsm
/* $NetBSD: brk.S,v 1.1 2014/08/10 05:47:37 matt Exp $ */
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/*-
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* Copyright (c) 2014 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 Matt Thomas of 3am Software Foundry.
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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 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 "SYS.h"
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.globl _C_LABEL(_end)
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.globl _C_LABEL(__curbrk)
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WEAK_ALIAS(brk, _brk)
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.data
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.globl _C_LABEL(__minbrk)
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.hidden _C_LABEL(__minbrk)
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.type _C_LABEL(__minbrk),#object
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.align 3
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_C_LABEL(__minbrk):
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.xword _C_LABEL(_end)
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.size _C_LABEL(__minbrk), 8
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/*
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* Change the data segment size
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*/
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ENTRY(_brk)
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adr x9, _C_LABEL(__minbrk)
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ldr x10, [x9, #:lo12:_C_LABEL(__minbrk)]
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/*
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* Valid the address specified and set to the minimum
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* if the address is below minbrk.
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*/
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cmp x0, x10
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csel x0, x10, x0, lt
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mov x11, x0
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SYSTRAP(break)
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_INVOKE_CERROR()
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/* Store the new address in curbrk */
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adr x9, _C_LABEL(__curbrk)
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str x11, [x9, #:lo12:_C_LABEL(__curbrk)]
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/* Return 0 for success */
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mov x0, xzr
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ret
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END(_brk)
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