1/* $NetBSD: brk.S,v 1.3 2001/07/16 05:50:06 matt 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: @(#)brk.s 5.2 (Berkeley) 12/17/90 36 */ 37 38#include "SYS.h" 39 40 .globl _C_LABEL(end) 41 .globl CURBRK 42 43#ifdef WEAK_ALIAS 44WEAK_ALIAS(brk, _brk) 45#endif 46 47 .data 48 .align 0 49 .globl _C_LABEL(__minbrk) 50 .type _C_LABEL(__minbrk),#object 51_C_LABEL(__minbrk): 52 .word _C_LABEL(end) 53 54/* 55 * Change the data segment size 56 */ 57ENTRY(_brk) 58#ifdef PIC 59 /* Setup the GOT */ 60 ldr r3, Lgot 61 add r3, pc, r3 62.L1: 63 ldr r1, Lminbrk 64 ldr r1, [r3, r1] 65#else 66 ldr r1, Lminbrk 67#endif 68 /* Get the minimum allowable brk address */ 69 ldr r1, [r1] 70 71 /* 72 * Valid the address specified and set to the minimum 73 * if the address is below minbrk. 74 */ 75 cmp r0, r1 76 movlt r0, r1 77 mov r2, r0 78 SYSTRAP(break) 79 bcs PIC_SYM(CERROR, PLT) 80 81#ifdef PIC 82 ldr r1, Lcurbrk 83 ldr r1, [r3, r1] 84#else 85 ldr r1, Lcurbrk 86#endif 87 /* Store the new address in curbrk */ 88 str r2, [r1] 89 90 /* Return 0 for success */ 91 mov r0, #0x00000000 92#ifdef __APCS_26__ 93 movs r15, r14 94#else 95 mov r15, r14 96#endif 97 98 .align 2 99#ifdef PIC 100Lgot: 101 .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) + (. - (.L1+4)) 102#endif 103Lminbrk: 104 .word PIC_SYM(_C_LABEL(__minbrk), GOT) 105Lcurbrk: 106 .word PIC_SYM(CURBRK, GOT) 107