1/* $OpenBSD: brk.S,v 1.11 2021/10/25 14:38:10 jca Exp $ */ 2/* $NetBSD: brk.S,v 1.7 2003/12/26 11:23:44 martin Exp $ */ 3 4/*- 5 * Copyright (c) 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * from: @(#)brk.s 5.2 (Berkeley) 12/17/90 33 */ 34 35#include "SYS.h" 36 37 .globl _C_LABEL(_end) 38 .globl __curbrk 39 40 .data 41 .align 2 42 .type __minbrk,#object 43__minbrk: 44 .word _C_LABEL(_end) 45 END(__minbrk) 46 47/* 48 * Change the data segment size 49 */ 50ENTRY(brk) 51#ifdef __PIC__ 52 /* Setup the GOT */ 53 ldr r3, .Lgot 54 ldr r1, .Lminbrk 55.L1: 56 add r3, pc, r3 57 ldr r1, [r3, r1] 58#else 59 ldr r1, .Lminbrk 60#endif 61 /* Get the minimum allowable brk address */ 62 ldr r1, [r1] 63 64 /* 65 * Valid the address specified and set to the minimum 66 * if the address is below minbrk. 67 */ 68 cmp r0, r1 69 movcc r0, r1 70 mov r2, r0 71 SYSTRAP(break) 72 bcs CERROR 73 74#ifdef __PIC__ 75 ldr r1, .Lcurbrk 76 ldr r1, [r3, r1] 77#else 78 ldr r1, .Lcurbrk 79#endif 80 /* Store the new address in curbrk */ 81 str r2, [r1] 82 83 /* Return 0 for success */ 84 mov r0, #0x00000000 85 mov r15, r14 86 87 .align 2 88#ifdef __PIC__ 89.Lgot: 90 .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (.L1+8) 91#endif 92.Lminbrk: 93 .word PIC_SYM(__minbrk, GOT) 94.Lcurbrk: 95 .word PIC_SYM(__curbrk, GOT) 96END(brk) 97 .weak brk 98