1/* $OpenBSD: brk.S,v 1.8 2022/12/08 02:11:27 guenther Exp $ */ 2/* $NetBSD: brk.S,v 1.10 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: @(#)brk.s 5.2 (Berkeley) 12/17/90 36 */ 37 38#include "SYS.h" 39 40 .weak brk 41 42 .data 43 .align 2 44__minbrk: 45 .long _end 46 .size __minbrk, . - __minbrk 47 .type __minbrk,@object 48 49 .text 50 51ENTRY(brk) 52#ifdef __PIC__ 53 mova L_GOT, r0 54 mov.l L_GOT, r2 55 add r0, r2 56 mov.l Lminbrk, r0 57 mov.l @(r0, r2), r0 58 mov.l @r0, r0 59#else 60 mov.l Lminbrk, r0 61 mov.l @r0, r0 62#endif 63 cmp/hs r4, r0 64 bf 1f 65 mov r0, r4 661: 67#if SYS_break >= 128 68 mov.l LSYS_break, r0 69#else 70 mov #SYS_break, r0 71#endif 72 trapa #0x80 73 bf 2f 74#ifdef __PIC__ 75 mov.l Lcurbrk, r0 76 mov.l @(r0, r2), r1 77 xor r0, r0 78#else 79 xor r0, r0 80 mov.l Lcurbrk, r1 81#endif 82 rts 83 mov.l r4, @r1 842: 85 SET_ERRNO_AND_RETURN 86 87 .align 2 88#if SYS_break >= 128 89LSYS_break: .long SYS_break 90#endif 91#ifdef __PIC__ 92L_GOT: .long _GLOBAL_OFFSET_TABLE_ 93Lminbrk: .long __minbrk@GOT 94Lcurbrk: .long __curbrk@GOT 95#else 96Lminbrk: .long __minbrk 97Lcurbrk: .long __curbrk 98#endif 99 SET_ENTRY_SIZE(brk) 100