brk.S revision 1.3
1 1.1 paulus /*- 2 1.1 paulus * Copyright (c) 1990 The Regents of the University of California. 3 1.1 paulus * All rights reserved. 4 1.1 paulus * 5 1.1 paulus * This code is derived from software contributed to Berkeley by 6 1.1 paulus * the Systems Programming Group of the University of Utah Computer 7 1.1 paulus * Science Department. 8 1.1 paulus * 9 1.1 paulus * Redistribution and use in source and binary forms, with or without 10 1.1 paulus * modification, are permitted provided that the following conditions 11 1.1 paulus * are met: 12 1.1 paulus * 1. Redistributions of source code must retain the above copyright 13 1.1 paulus * notice, this list of conditions and the following disclaimer. 14 1.1 paulus * 2. Redistributions in binary form must reproduce the above copyright 15 1.1 paulus * notice, this list of conditions and the following disclaimer in the 16 1.1 paulus * documentation and/or other materials provided with the distribution. 17 1.1 paulus * 3. All advertising materials mentioning features or use of this software 18 1.1 paulus * must display the following acknowledgement: 19 1.1 paulus * This product includes software developed by the University of 20 1.1 paulus * California, Berkeley and its contributors. 21 1.1 paulus * 4. Neither the name of the University nor the names of its contributors 22 1.1 paulus * may be used to endorse or promote products derived from this software 23 1.1 paulus * without specific prior written permission. 24 1.1 paulus * 25 1.1 paulus * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 1.1 paulus * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 1.1 paulus * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 1.1 paulus * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 1.1 paulus * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 1.1 paulus * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 1.1 paulus * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 1.1 paulus * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 1.1 paulus * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 1.1 paulus * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 1.1 paulus * SUCH DAMAGE. 36 1.1 paulus */ 37 1.1 paulus 38 1.1 paulus #if defined(LIBC_SCCS) && !defined(lint) 39 1.1 paulus .text 40 1.1 paulus /*.asciz "from: @(#)brk.s 5.1 (Berkeley) 5/12/90"*/ 41 1.3 mycroft .asciz "$Id: brk.S,v 1.3 1994/01/27 15:09:16 mycroft Exp $" 42 1.1 paulus #endif /* LIBC_SCCS and not lint */ 43 1.1 paulus 44 1.1 paulus #include "SYS.h" 45 1.1 paulus 46 1.3 mycroft .globl _end 47 1.3 mycroft .globl minbrk 48 1.1 paulus .globl curbrk 49 1.3 mycroft 50 1.3 mycroft .data 51 1.3 mycroft minbrk: .long _end 52 1.3 mycroft .text 53 1.3 mycroft 54 1.1 paulus ENTRY(brk) 55 1.1 paulus #ifdef PIC 56 1.1 paulus movl #__GLOBAL_OFFSET_TABLE_,a1 57 1.1 paulus lea pc@(0,a1:l),a1 58 1.1 paulus movl a1@(minbrk:w),a0 59 1.1 paulus movl a0@,d0 60 1.1 paulus #else 61 1.1 paulus movl minbrk,d0 62 1.1 paulus #endif 63 1.1 paulus cmpl sp@(4),d0 64 1.1 paulus jle ok 65 1.1 paulus movl d0,sp@(4) 66 1.1 paulus ok: 67 1.2 mycroft movl #SYS_break,d0 68 1.1 paulus trap #0 69 1.1 paulus jcs err 70 1.1 paulus #ifdef PIC 71 1.1 paulus movl a1@(curbrk:w),a0 72 1.1 paulus movl sp@(4),a0@ 73 1.1 paulus #else 74 1.1 paulus movl sp@(4),curbrk 75 1.1 paulus #endif 76 1.1 paulus clrl d0 77 1.1 paulus rts 78 1.1 paulus err: 79 1.1 paulus #ifdef PIC 80 1.1 paulus movl d0,sp@- 81 1.1 paulus #endif 82 1.1 paulus jra cerror 83
Indexes created Thu Sep 25 16:09:42 GMT 2025