1*84d9c625SLionel Sambuc/* $NetBSD: sbrk.S,v 1.12 2013/09/12 15:36:15 joerg Exp $ */ 22fe8fb19SBen Gras 32fe8fb19SBen Gras/*- 42fe8fb19SBen Gras * Copyright (c) 1990 The Regents of the University of California. 52fe8fb19SBen Gras * All rights reserved. 62fe8fb19SBen Gras * 72fe8fb19SBen Gras * Redistribution and use in source and binary forms, with or without 82fe8fb19SBen Gras * modification, are permitted provided that the following conditions 92fe8fb19SBen Gras * are met: 102fe8fb19SBen Gras * 1. Redistributions of source code must retain the above copyright 112fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer. 122fe8fb19SBen Gras * 2. Redistributions in binary form must reproduce the above copyright 132fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer in the 142fe8fb19SBen Gras * documentation and/or other materials provided with the distribution. 152fe8fb19SBen Gras * 3. Neither the name of the University nor the names of its contributors 162fe8fb19SBen Gras * may be used to endorse or promote products derived from this software 172fe8fb19SBen Gras * without specific prior written permission. 182fe8fb19SBen Gras * 192fe8fb19SBen Gras * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 202fe8fb19SBen Gras * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 212fe8fb19SBen Gras * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 222fe8fb19SBen Gras * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 232fe8fb19SBen Gras * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 242fe8fb19SBen Gras * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 252fe8fb19SBen Gras * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 262fe8fb19SBen Gras * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 272fe8fb19SBen Gras * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 282fe8fb19SBen Gras * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 292fe8fb19SBen Gras * SUCH DAMAGE. 302fe8fb19SBen Gras * 312fe8fb19SBen Gras * from: @(#)sbrk.s 5.1 (Berkeley) 4/23/90 322fe8fb19SBen Gras */ 332fe8fb19SBen Gras 342fe8fb19SBen Gras#include "SYS.h" 352fe8fb19SBen Gras 36f14fb602SLionel Sambuc .globl _C_LABEL(_end) 372fe8fb19SBen Gras 382fe8fb19SBen Gras#ifdef WEAK_ALIAS 392fe8fb19SBen GrasWEAK_ALIAS(sbrk, _sbrk) 402fe8fb19SBen Gras#endif 412fe8fb19SBen Gras 422fe8fb19SBen Gras .data 432fe8fb19SBen Gras .align 0 44*84d9c625SLionel Sambuc .globl _C_LABEL(__curbrk) 45*84d9c625SLionel Sambuc .hidden _C_LABEL(__curbrk) 46*84d9c625SLionel Sambuc .type _C_LABEL(__curbrk),#object 47*84d9c625SLionel Sambuc_C_LABEL(__curbrk): 48f14fb602SLionel Sambuc .word _C_LABEL(_end) 492fe8fb19SBen Gras 502fe8fb19SBen Gras/* 512fe8fb19SBen Gras * Change the data segment size 522fe8fb19SBen Gras */ 532fe8fb19SBen GrasENTRY(_sbrk) 54*84d9c625SLionel Sambuc /* get address or offset to __curbrk */ 552fe8fb19SBen Gras ldr r2, .Lcurbrk 56*84d9c625SLionel Sambuc#ifdef __PIC__ 57*84d9c625SLionel Sambuc add r2, r2, pc /* pc = &.LPIC0 */ 582fe8fb19SBen Gras#endif 59*84d9c625SLionel Sambuc 602fe8fb19SBen Gras /* Get the current brk address */ 612fe8fb19SBen Gras ldr r1, [r2] 622fe8fb19SBen Gras 632fe8fb19SBen Gras /* Calculate new value */ 64*84d9c625SLionel Sambuc.LPIC0: mov r3, r0 65*84d9c625SLionel Sambuc adds r0, r0, r1 662fe8fb19SBen Gras SYSTRAP(break) 67*84d9c625SLionel Sambuc _INVOKE_CERROR() 682fe8fb19SBen Gras 692fe8fb19SBen Gras /* Store new curbrk value */ 702fe8fb19SBen Gras ldr r0, [r2] 71*84d9c625SLionel Sambuc adds r1, r0, r3 722fe8fb19SBen Gras str r1, [r2] 732fe8fb19SBen Gras 742fe8fb19SBen Gras /* Return old curbrk value */ 752fe8fb19SBen Gras RET 762fe8fb19SBen Gras 772fe8fb19SBen Gras .align 0 782fe8fb19SBen Gras.Lcurbrk: 79*84d9c625SLionel Sambuc .word REL_SYM(_C_LABEL(__curbrk), .LPIC0) 80*84d9c625SLionel SambucEND(_sbrk) 81