1/* $OpenBSD: brk.S,v 1.6 2015/08/26 01:54:09 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 40WEAK_ALIAS(brk, _brk) 41 42 .data 43 .align 0 44 .type __minbrk,#object 45__minbrk: 46 .word _C_LABEL(end) 47 48/* 49 * Change the data segment size 50 */ 51ENTRY(_brk) 52#ifdef __PIC__ 53 /* Setup the GOT */ 54 ldr r3, .Lgot 55 ldr r1, .Lminbrk 56.L1: 57 add r3, pc, r3 58 ldr r1, [r3, r1] 59#else 60 ldr r1, .Lminbrk 61#endif 62 /* Get the minimum allowable brk address */ 63 ldr r1, [r1] 64 65 /* 66 * Valid the address specified and set to the minimum 67 * if the address is below minbrk. 68 */ 69 cmp r0, r1 70 movcc r0, r1 71 mov r2, r0 72 SYSTRAP(break) 73 bcs PIC_SYM(CERROR, PLT) 74 75#ifdef __PIC__ 76 ldr r1, .Lcurbrk 77 ldr r1, [r3, r1] 78#else 79 ldr r1, .Lcurbrk 80#endif 81 /* Store the new address in curbrk */ 82 str r2, [r1] 83 84 /* Return 0 for success */ 85 mov r0, #0x00000000 86 mov r15, r14 87 88 .align 2 89#ifdef __PIC__ 90.Lgot: 91 .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (.L1+8) 92#endif 93.Lminbrk: 94 .word PIC_SYM(__minbrk, GOT) 95.Lcurbrk: 96 .word PIC_SYM(__curbrk, GOT) 97