1/* $OpenBSD: brk.S,v 1.2 2012/08/22 17:19:35 pascal 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#ifdef WEAK_ALIAS 41WEAK_ALIAS(brk,_brk) 42#endif 43 44 .data 45 .globl _C_LABEL(__minbrk) 46 .align 2 47_C_LABEL(__minbrk): 48 .long _C_LABEL(end) 49 50 .text 51 52SYSENTRY(_brk) 53#ifdef __PIC__ 54 mova L_GOT, r0 55 mov.l L_GOT, r2 56 add r0, r2 57 mov.l Lminbrk, r0 58 mov.l @(r0, r2), r0 59 mov.l @r0, r0 60#else 61 mov.l Lminbrk, r0 62 mov.l @r0, r0 63#endif 64 cmp/hs r4, r0 65 bf 1f 66 mov r0, r4 671: 68 mov.l LSYS_break, r0 69 trapa #0x80 70 bf err 71#ifdef __PIC__ 72 mov.l Lcurbrk, r0 73 mov.l @(r0, r2), r1 74 xor r0, r0 75#else 76 xor r0, r0 77 mov.l Lcurbrk, r1 78#endif 79 rts 80 mov.l r4, @r1 81err: 82 JUMP_CERROR 83 84 .align 2 85LSYS_break: .long SYS_break 86#ifdef __PIC__ 87L_GOT: .long _GLOBAL_OFFSET_TABLE_ 88Lminbrk: .long _C_LABEL(__minbrk)@GOT 89Lcurbrk: .long _C_LABEL(__curbrk)@GOT 90#else 91Lminbrk: .long _C_LABEL(__minbrk) 92Lcurbrk: .long _C_LABEL(__curbrk) 93#endif 94 SET_ENTRY_SIZE(_brk) 95