brk.S revision 1.5
1 /* $NetBSD: brk.S,v 1.5 1999/01/14 22:48:22 kleink Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 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. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * from: Header: brk.s,v 1.3 92/06/25 12:56:05 mccanne Exp 40 */ 41 42 #include <machine/asm.h> 43 #if defined(SYSLIBC_SCCS) && !defined(lint) 44 #if 0 45 .asciz "@(#)brk.s 8.1 (Berkeley) 6/4/93" 46 #else 47 RCSID("$NetBSD: brk.S,v 1.5 1999/01/14 22:48:22 kleink Exp $") 48 #endif 49 #endif /* SYSLIBC_SCCS and not lint */ 50 51 #include "SYS.h" 52 53 .globl curbrk 54 .globl _C_LABEL(__minbrk) 55 56 .data 57 _C_LABEL(__minbrk): 58 .long _C_LABEL(end) ! lower brk limit; also for gmon code 59 .text 60 61 #ifdef PIC 62 ENTRY(brk) 63 PIC_PROLOGUE(%o5,%o4) 64 ld [%o5 + _C_LABEL(__minbrk)], %o4 65 ld [%o4], %o1 ! %o1 = minbrk 66 cmp %o1, %o0 ! if (minbrk > %o0) 67 bg,a 0f 68 mov %o1, %o0 ! %o0 = minbrk 69 0: 70 mov %o0, %o2 ! save argument to syscall 71 mov SYS_break, %g1 72 t ST_SYSCALL 73 bcc,a 1f 74 ld [%o5 + curbrk], %o4 75 ERROR() 76 1: 77 retl ! success, return 0 & record new break 78 st %o2, [%o4] 79 #else 80 ENTRY(brk) 81 sethi %hi(_C_LABEL(__minbrk)), %o1 ! %o1 = minbrk 82 ld [%o1 + %lo(_C_LABEL(__minbrk))], %o1 83 cmp %o1, %o0 ! if (minbrk > %o0) 84 bg,a 0f 85 mov %o1, %o0 ! %o0 = minbrk 86 0: 87 mov %o0, %o2 ! save argument to syscall 88 mov SYS_break, %g1 89 t ST_SYSCALL 90 bcc,a 1f 91 sethi %hi(curbrk), %g1 92 ERROR() 93 1: 94 retl ! success, return 0 & record new break 95 st %o2, [%g1 + %lo(curbrk)] 96 #endif 97
Indexes created Wed Oct 01 19:09:53 GMT 2025