1/* $OpenBSD: brk.S,v 1.5 2018/08/12 17:15:10 mortimer 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 3 42 .type __minbrk,#object 43__minbrk: 44 .quad _C_LABEL(_end) 45 END(__minbrk) 46 47/* 48 * Change the data segment size 49 */ 50ENTRY(brk) 51 RETGUARD_SETUP(brk, x15) 52#ifdef __PIC__ 53 /* Setup the GOT */ 54 adrp x3, :got:__minbrk 55 ldr x1, [x3, #:got_lo12:__minbrk] 56#else 57 ldr x1, .Lminbrk 58#endif 59 /* Get the minimum allowable brk address */ 60 ldr x1, [x1] 61 62 /* 63 * Valid the address specified and set to the minimum 64 * if the address is below minbrk. 65 */ 66 cmp x0, x1 67 b.ge 1f 68 mov x0, x1 691: 70 mov x2, x0 71 SYSTRAP(break) 72 bcs CERROR 73 74#ifdef __PIC__ 75 adrp x3, :got:__curbrk 76 ldr x1, [x3, #:got_lo12:__curbrk] 77#else 78 ldr x1, .Lcurbrk 79#endif 80 /* Store the new address in curbrk */ 81 str x2, [x1] 82 83 /* Return 0 for success */ 84 mov x0, #0x00000000 85 RETGUARD_CHECK(brk, x15) 86 ret 87 88 .align 3 89#if !defined(__PIC__) 90.Lminbrk: 91 .quad __minbrk 92.Lcurbrk: 93 .quad __curbrk 94#endif 95END(brk) 96 .weak brk 97