1/* $NetBSD: sbrk.S,v 1.8 2004/08/21 11:30:17 rearnsha Exp $ */ 2 3/*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * from: @(#)sbrk.s 5.1 (Berkeley) 4/23/90 32 */ 33 34#include "SYS.h" 35 36 .globl _C_LABEL(end) 37 38#ifdef WEAK_ALIAS 39WEAK_ALIAS(sbrk, _sbrk) 40#endif 41 42 .data 43 .align 0 44 .globl CURBRK 45 .type CURBRK,#object 46CURBRK: 47 .word _C_LABEL(end) 48 49/* 50 * Change the data segment size 51 */ 52ENTRY(_sbrk) 53#ifdef PIC 54 /* Setup the GOT */ 55 ldr r3, .Lgot 56 add r3, pc, r3 57.L1: 58 ldr r2, .Lcurbrk 59 ldr r2, [r3, r2] 60#else 61 ldr r2, .Lcurbrk 62#endif 63 /* Get the current brk address */ 64 ldr r1, [r2] 65 66 /* Calculate new value */ 67 mov r3, r0 68 add r0, r0, r1 69 SYSTRAP(break) 70 bcs PIC_SYM(CERROR, PLT) 71 72 /* Store new curbrk value */ 73 ldr r0, [r2] 74 add r1, r0, r3 75 str r1, [r2] 76 77 /* Return old curbrk value */ 78 RET 79 80 .align 0 81#ifdef PIC 82.Lgot: 83 .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) + (. - (.L1+4)) 84#endif 85.Lcurbrk: 86 .word PIC_SYM(CURBRK, GOT) 87