77 lines
2.1 KiB
ArmAsm
77 lines
2.1 KiB
ArmAsm
/*-
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* Copyright (c) 2014 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Andrew Turner under
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* sponsorship from the FreeBSD Foundation.
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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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#include <machine/asm.h>
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__FBSDID("$FreeBSD$");
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#include "SYS.h"
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.globl _C_LABEL(_end)
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.data
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.align 3
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.globl _C_LABEL(minbrk)
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.type _C_LABEL(minbrk),#object
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_C_LABEL(minbrk):
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.quad _C_LABEL(_end)
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.text
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/*
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* int brk(const void *addr);
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*/
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ENTRY(_brk)
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WEAK_REFERENCE(_brk, brk)
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/* Load the address of minbrk */
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adrp x3, minbrk
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ldr x2, [x3, :lo12:minbrk]
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/* Validate the address */
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cmp x0, x2
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b.ge 1f
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/* Invalid, set it to the minimum */
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mov x0, x2
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/* Backup the new address */
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1: mov x4, x0
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/* Update for this value, will overwrite x0 and x1 */
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_SYSCALL(break)
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b.cs cerror
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/* Store the new curbrk value */
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adrp x2, curbrk
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str x4, [x2, :lo12:curbrk]
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/* Return success */
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mov x0, #0
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ret
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END(_brk)
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