1/* $OpenBSD: sbrk.S,v 1.6 2022/12/08 01:25:43 guenther Exp $ */ 2/* $NetBSD: sbrk.S,v 1.7 2003/08/07 16:42:05 agc 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: @(#)sbrk.s 5.1 (Berkeley) 4/23/90 33 */ 34 35#include "SYS.h" 36 37 .globl _end 38 39 .data 40 .align 3 41 .globl __curbrk 42 .type __curbrk,#object 43 .hidden __curbrk 44__curbrk: 45 .quad _end 46 END(__curbrk) 47 48/* 49 * Change the data segment size 50 */ 51ENTRY_NB(sbrk) 52 RETGUARD_SETUP(sbrk, x15) 53#ifdef __PIC__ 54 /* Setup the GOT */ 55 adrp x3, :got:__curbrk 56 ldr x2, [x3, #:got_lo12:__curbrk] 57#else 58 ldr x2, .Lcurbrk 59#endif 60 /* Get the current brk address */ 61 ldr x1, [x2] 62 63 /* Calculate new value */ 64 mov x3, x0 65 add x0, x0, x1 66 SYSTRAP(break) 67 bcs CERROR 68 69 /* Store new curbrk value */ 70 ldr x0, [x2] 71 add x1, x0, x3 72 str x1, [x2] 73 74 /* Return old curbrk value */ 75 RETGUARD_CHECK(sbrk, x15) 76 ret 77 78 .align 3 79#if !defined(__PIC__) 80.Lcurbrk: 81 .quad __curbrk 82#endif 83END(sbrk) 84 .weak sbrk 85