2012-11-15 12:06:41 +01:00
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/* $NetBSD: sbrk.S,v 1.9 2011/05/13 23:14:36 nonaka Exp $ */
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2011-02-14 20:36:03 +01:00
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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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* 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: @(#)sbrk.s 5.1 (Berkeley) 4/23/90
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*/
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#include "SYS.h"
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2012-11-15 12:06:41 +01:00
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.globl _C_LABEL(_end)
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2011-02-14 20:36:03 +01:00
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#ifdef WEAK_ALIAS
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WEAK_ALIAS(sbrk, _sbrk)
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#endif
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.data
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.align 0
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.globl CURBRK
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.type CURBRK,#object
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CURBRK:
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2012-11-15 12:06:41 +01:00
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.word _C_LABEL(_end)
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2011-02-14 20:36:03 +01:00
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/*
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* Change the data segment size
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*/
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ENTRY(_sbrk)
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#ifdef PIC
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/* Setup the GOT */
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ldr r3, .Lgot
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add r3, pc, r3
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.L1:
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ldr r2, .Lcurbrk
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ldr r2, [r3, r2]
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#else
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ldr r2, .Lcurbrk
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#endif
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/* Get the current brk address */
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ldr r1, [r2]
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/* Calculate new value */
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mov r3, r0
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add r0, r0, r1
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SYSTRAP(break)
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bcs PIC_SYM(CERROR, PLT)
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/* Store new curbrk value */
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ldr r0, [r2]
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add r1, r0, r3
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str r1, [r2]
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/* Return old curbrk value */
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RET
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.align 0
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#ifdef PIC
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.Lgot:
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.word _C_LABEL(_GLOBAL_OFFSET_TABLE_) + (. - (.L1+4))
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#endif
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.Lcurbrk:
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.word PIC_SYM(CURBRK, GOT)
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