1*84d9c625SLionel Sambuc/* $NetBSD: brk.S,v 1.13 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: @(#)brk.s 5.2 (Berkeley) 12/17/90 322fe8fb19SBen Gras */ 332fe8fb19SBen Gras 342fe8fb19SBen Gras#include "SYS.h" 352fe8fb19SBen Gras 36f14fb602SLionel Sambuc .globl _C_LABEL(_end) 37*84d9c625SLionel Sambuc .globl _C_LABEL(__curbrk) 382fe8fb19SBen Gras 392fe8fb19SBen Gras#ifdef WEAK_ALIAS 402fe8fb19SBen GrasWEAK_ALIAS(brk, _brk) 412fe8fb19SBen Gras#endif 422fe8fb19SBen Gras 432fe8fb19SBen Gras .data 442fe8fb19SBen Gras .align 0 452fe8fb19SBen Gras .globl _C_LABEL(__minbrk) 46*84d9c625SLionel Sambuc .hidden _C_LABEL(__minbrk) 472fe8fb19SBen Gras .type _C_LABEL(__minbrk),#object 482fe8fb19SBen Gras_C_LABEL(__minbrk): 49f14fb602SLionel Sambuc .word _C_LABEL(_end) 502fe8fb19SBen Gras 512fe8fb19SBen Gras/* 522fe8fb19SBen Gras * Change the data segment size 532fe8fb19SBen Gras */ 542fe8fb19SBen GrasENTRY(_brk) 552fe8fb19SBen Gras ldr r1, .Lminbrk 56*84d9c625SLionel Sambuc#ifdef __PIC__ 57*84d9c625SLionel Sambuc adr r3, .Lminbrk 58*84d9c625SLionel Sambuc adds r1, r1, r3 592fe8fb19SBen Gras#endif 602fe8fb19SBen Gras /* Get the minimum allowable brk address */ 612fe8fb19SBen Gras ldr r1, [r1] 622fe8fb19SBen Gras 632fe8fb19SBen Gras /* 642fe8fb19SBen Gras * Valid the address specified and set to the minimum 652fe8fb19SBen Gras * if the address is below minbrk. 662fe8fb19SBen Gras */ 672fe8fb19SBen Gras cmp r0, r1 68*84d9c625SLionel Sambuc#ifdef __thumb__ 69*84d9c625SLionel Sambuc bcs 1f 70*84d9c625SLionel Sambuc mov r0, r1 71*84d9c625SLionel Sambuc1: 72*84d9c625SLionel Sambuc#else 732fe8fb19SBen Gras movcc r0, r1 74*84d9c625SLionel Sambuc#endif 752fe8fb19SBen Gras mov r2, r0 762fe8fb19SBen Gras SYSTRAP(break) 77*84d9c625SLionel Sambuc _INVOKE_CERROR() 782fe8fb19SBen Gras 792fe8fb19SBen Gras ldr r1, .Lcurbrk 80*84d9c625SLionel Sambuc#ifdef __PIC__ 81*84d9c625SLionel Sambuc adds r1, r1, r3 822fe8fb19SBen Gras#endif 832fe8fb19SBen Gras /* Store the new address in curbrk */ 842fe8fb19SBen Gras str r2, [r1] 852fe8fb19SBen Gras 862fe8fb19SBen Gras /* Return 0 for success */ 87*84d9c625SLionel Sambuc movs r0, #0 882fe8fb19SBen Gras RET 892fe8fb19SBen Gras 90*84d9c625SLionel Sambuc .align 0 912fe8fb19SBen Gras.Lminbrk: 92*84d9c625SLionel Sambuc .word REL_SYM(_C_LABEL(__minbrk), .Lminbrk) 932fe8fb19SBen Gras.Lcurbrk: 94*84d9c625SLionel Sambuc .word REL_SYM(_C_LABEL(__curbrk), .Lminbrk) 95*84d9c625SLionel SambucEND(_brk) 96