sbrk.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: sbrk.s,v 1.3 92/07/02 00:56:49 torek Exp 38 1.2 pk * $Id: sbrk.S,v 1.2 1994/02/10 20:16:01 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 "@(#)sbrk.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 _end 48 1.1 cgd .globl curbrk 49 1.1 cgd 50 1.1 cgd .data 51 1.1 cgd curbrk: .long _end 52 1.1 cgd .text 53 1.1 cgd 54 1.1 cgd ENTRY(sbrk) 55 1.2 pk #ifdef PIC 56 1.2 pk PIC_PROLOGUE(%o5,%o4) 57 1.2 pk ld [%o5 + curbrk], %o2 58 1.2 pk ld [%o2], %o3 ! %o3 = old break 59 1.2 pk add %o3, %o0, %o4 ! %o4 = new break 60 1.2 pk mov %o4, %o0 ! copy for syscall 61 1.2 pk mov SYS_break, %g1 62 1.2 pk t ST_SYSCALL ! break(new_break) 63 1.2 pk bcc,a 1f ! if success, 64 1.2 pk mov %o3, %o0 ! set return value 65 1.2 pk ERROR() 66 1.2 pk 1: 67 1.2 pk retl ! and update curbrk 68 1.2 pk st %o4, [%o2] 69 1.2 pk #else 70 1.1 cgd sethi %hi(curbrk), %o2 71 1.1 cgd ld [%o2 + %lo(curbrk)], %o3 ! %o3 = old break 72 1.1 cgd add %o3, %o0, %o4 ! %o4 = new break 73 1.1 cgd mov %o4, %o0 ! copy for syscall 74 1.1 cgd mov SYS_break, %g1 75 1.1 cgd t ST_SYSCALL ! break(new_break) 76 1.1 cgd bcc,a 1f ! if success, 77 1.1 cgd mov %o3, %o0 ! set return value 78 1.1 cgd ERROR() 79 1.1 cgd 1: 80 1.1 cgd retl ! and update curbrk 81 1.1 cgd st %o4, [%o2 + %lo(curbrk)] 82 1.2 pk #endif 83
Indexes created Tue Sep 30 20:09:53 GMT 2025