1/* $OpenBSD: brk.S,v 1.9 2016/08/06 19:16:09 guenther 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 0 42 .type __minbrk,#object 43__minbrk: 44 .word _C_LABEL(_end) 45 END(__minbrk) 46 47 .weak brk 48 49/* 50 * Change the data segment size 51 */ 52ENTRY(brk) 53#ifdef __PIC__ 54 /* Setup the GOT */ 55 ldr r3, .Lgot 56 ldr r1, .Lminbrk 57.L1: 58 add r3, pc, r3 59 ldr r1, [r3, r1] 60#else 61 ldr r1, .Lminbrk 62#endif 63 /* Get the minimum allowable brk address */ 64 ldr r1, [r1] 65 66 /* 67 * Valid the address specified and set to the minimum 68 * if the address is below minbrk. 69 */ 70 cmp r0, r1 71 movcc r0, r1 72 mov r2, r0 73 SYSTRAP(break) 74 bcs CERROR 75 76#ifdef __PIC__ 77 ldr r1, .Lcurbrk 78 ldr r1, [r3, r1] 79#else 80 ldr r1, .Lcurbrk 81#endif 82 /* Store the new address in curbrk */ 83 str r2, [r1] 84 85 /* Return 0 for success */ 86 mov r0, #0x00000000 87 mov r15, r14 88 89 .align 2 90#ifdef __PIC__ 91.Lgot: 92 .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (.L1+8) 93#endif 94.Lminbrk: 95 .word PIC_SYM(__minbrk, GOT) 96.Lcurbrk: 97 .word PIC_SYM(__curbrk, GOT) 98END(brk) 99