brk.S revision 1.2
1 1.1 cgd /* 2 1.1 cgd * Copyright (c) 1992, 1993 3 1.1 cgd * The Regents of the University of California. All rights reserved. 4 1.1 cgd * 5 1.1 cgd * This software was developed by the Computer Systems Engineering group 6 1.1 cgd * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7 1.1 cgd * contributed to Berkeley. 8 1.1 cgd * 9 1.1 cgd * Redistribution and use in source and binary forms, with or without 10 1.1 cgd * modification, are permitted provided that the following conditions 11 1.1 cgd * are met: 12 1.1 cgd * 1. Redistributions of source code must retain the above copyright 13 1.1 cgd * notice, this list of conditions and the following disclaimer. 14 1.1 cgd * 2. Redistributions in binary form must reproduce the above copyright 15 1.1 cgd * notice, this list of conditions and the following disclaimer in the 16 1.1 cgd * documentation and/or other materials provided with the distribution. 17 1.1 cgd * 3. All advertising materials mentioning features or use of this software 18 1.1 cgd * must display the following acknowledgement: 19 1.1 cgd * This product includes software developed by the University of 20 1.1 cgd * California, Berkeley and its contributors. 21 1.1 cgd * 4. Neither the name of the University nor the names of its contributors 22 1.1 cgd * may be used to endorse or promote products derived from this software 23 1.1 cgd * without specific prior written permission. 24 1.1 cgd * 25 1.1 cgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 1.1 cgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 1.1 cgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 1.1 cgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 1.1 cgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 1.1 cgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 1.1 cgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 1.1 cgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 1.1 cgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 1.1 cgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 1.1 cgd * SUCH DAMAGE. 36 1.1 cgd * 37 1.1 cgd * from: Header: brk.s,v 1.3 92/06/25 12:56:05 mccanne Exp 38 1.2 pk * $Id: brk.S,v 1.2 1994/02/10 20:15:56 pk Exp $ 39 1.1 cgd */ 40 1.1 cgd 41 1.1 cgd #if defined(LIBC_SCCS) && !defined(lint) 42 1.1 cgd .asciz "@(#)brk.s 8.1 (Berkeley) 6/4/93" 43 1.1 cgd #endif /* LIBC_SCCS and not lint */ 44 1.1 cgd 45 1.1 cgd #include "SYS.h" 46 1.1 cgd 47 1.1 cgd .globl curbrk 48 1.1 cgd .globl minbrk 49 1.1 cgd 50 1.1 cgd .data 51 1.1 cgd minbrk: .long _end ! lower brk limit; also for gmon code 52 1.1 cgd .text 53 1.1 cgd 54 1.2 pk #ifdef PIC 55 1.2 pk ENTRY(brk) 56 1.2 pk PIC_PROLOGUE(%o5,%o4) 57 1.2 pk ld [%o5 + minbrk], %o4 58 1.2 pk ld [%o4], %o1 ! %o1 = minbrk 59 1.2 pk cmp %o1, %o0 ! if (minbrk > %o0) 60 1.2 pk bg,a 0f 61 1.2 pk mov %o1, %o0 ! %o0 = minbrk 62 1.2 pk 0: 63 1.2 pk mov %o0, %o2 ! save argument to syscall 64 1.2 pk mov SYS_break, %g1 65 1.2 pk t ST_SYSCALL 66 1.2 pk bcc,a 1f 67 1.2 pk ld [%o5 + curbrk], %o4 68 1.2 pk ERROR() 69 1.2 pk 1: 70 1.2 pk retl ! success, return 0 & record new break 71 1.2 pk st %o2, [%o4] 72 1.2 pk #else 73 1.1 cgd ENTRY(brk) 74 1.1 cgd sethi %hi(minbrk), %o1 ! %o1 = minbrk 75 1.1 cgd ld [%o1 + %lo(minbrk)], %o1 76 1.1 cgd cmp %o1, %o0 ! if (minbrk > %o0) 77 1.1 cgd bg,a 0f 78 1.1 cgd mov %o1, %o0 ! %o0 = minbrk 79 1.1 cgd 0: 80 1.1 cgd mov %o0, %o2 ! save argument to syscall 81 1.1 cgd mov SYS_break, %g1 82 1.1 cgd t ST_SYSCALL 83 1.1 cgd bcc,a 1f 84 1.1 cgd sethi %hi(curbrk), %g1 85 1.1 cgd ERROR() 86 1.1 cgd 1: 87 1.1 cgd retl ! success, return 0 & record new break 88 1.1 cgd st %o2, [%g1 + %lo(curbrk)] 89 1.2 pk #endif 90
Indexes created Thu Oct 02 01:09:59 GMT 2025