brk.S revision 1.3
1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * the Systems Programming Group of the University of Utah Computer 7 * Science Department. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 #if defined(LIBC_SCCS) && !defined(lint) 39 .text 40 /*.asciz "from: @(#)brk.s 5.1 (Berkeley) 5/12/90"*/ 41 .asciz "$Id: brk.S,v 1.3 1994/01/27 15:09:16 mycroft Exp $" 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include "SYS.h" 45 46 .globl _end 47 .globl minbrk 48 .globl curbrk 49 50 .data 51 minbrk: .long _end 52 .text 53 54 ENTRY(brk) 55 #ifdef PIC 56 movl #__GLOBAL_OFFSET_TABLE_,a1 57 lea pc@(0,a1:l),a1 58 movl a1@(minbrk:w),a0 59 movl a0@,d0 60 #else 61 movl minbrk,d0 62 #endif 63 cmpl sp@(4),d0 64 jle ok 65 movl d0,sp@(4) 66 ok: 67 movl #SYS_break,d0 68 trap #0 69 jcs err 70 #ifdef PIC 71 movl a1@(curbrk:w),a0 72 movl sp@(4),a0@ 73 #else 74 movl sp@(4),curbrk 75 #endif 76 clrl d0 77 rts 78 err: 79 #ifdef PIC 80 movl d0,sp@- 81 #endif 82 jra cerror 83
Indexes created Fri Sep 26 08:10:20 GMT 2025