1/* $OpenBSD: sbrk.S,v 1.10 2024/03/27 20:03:29 miod Exp $ */ 2/* $NetBSD: sbrk.S,v 1.9 2006/01/06 03:58:31 uwe Exp $ */ 3 4/*- 5 * Copyright (c) 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * William Jolitz. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: @(#)sbrk.s 5.1 (Berkeley) 4/23/90 36 */ 37 38#include "SYS.h" 39 40 .globl _end 41 .globl __curbrk 42 .hidden __curbrk 43 44 .weak sbrk 45 46 .data 47__curbrk: 48 .long _end 49 .size __curbrk, . - __curbrk 50 .type __curbrk,@object 51 52 .text 53 54ENTRY(sbrk) 55 mov r4, r2 56#ifdef __PIC__ 57 mova L_GOT, r0 58 mov.l L_GOT, r3 59 add r0, r3 60 mov.l Lcurbrk, r0 61 mov.l @(r0, r3), r0 62#else 63 mov.l Lcurbrk, r0 64#endif 65 mov.l @r0, r0 66 add r0, r4 67 systrap SYS_break 68 bf 1f 69#ifdef __PIC__ 70 mov.l Lcurbrk, r0 71 mov.l @(r0, r3), r1 72#else 73 mov.l Lcurbrk, r1 74#endif 75 mov.l @r1, r0 76 add r0, r2 77 rts 78 mov.l r2, @r1 791: 80 SET_ERRNO_AND_RETURN(break) 81 82 .align 2 83 systrap_data SYS_break 84#ifdef __PIC__ 85L_GOT: .long _GLOBAL_OFFSET_TABLE_ 86Lcurbrk: .long __curbrk@GOT 87#else 88Lcurbrk: .long __curbrk 89#endif 90 SET_ENTRY_SIZE(sbrk) 91