brk.S revision 1.12
1 1.12 uwe /* $NetBSD: brk.S,v 1.12 2007/10/08 13:06:00 uwe Exp $ */ 2 1.3 christos 3 1.1 cgd /* 4 1.1 cgd * Copyright (c) 1992, 1993 5 1.1 cgd * The Regents of the University of California. All rights reserved. 6 1.1 cgd * 7 1.1 cgd * This software was developed by the Computer Systems Engineering group 8 1.1 cgd * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 1.1 cgd * contributed to Berkeley. 10 1.1 cgd * 11 1.1 cgd * Redistribution and use in source and binary forms, with or without 12 1.1 cgd * modification, are permitted provided that the following conditions 13 1.1 cgd * are met: 14 1.1 cgd * 1. Redistributions of source code must retain the above copyright 15 1.1 cgd * notice, this list of conditions and the following disclaimer. 16 1.1 cgd * 2. Redistributions in binary form must reproduce the above copyright 17 1.1 cgd * notice, this list of conditions and the following disclaimer in the 18 1.1 cgd * documentation and/or other materials provided with the distribution. 19 1.10 agc * 3. Neither the name of the University nor the names of its contributors 20 1.1 cgd * may be used to endorse or promote products derived from this software 21 1.1 cgd * without specific prior written permission. 22 1.1 cgd * 23 1.1 cgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 1.1 cgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 1.1 cgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 1.1 cgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 1.1 cgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 1.1 cgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 1.1 cgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 1.1 cgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 1.1 cgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 1.1 cgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 1.1 cgd * SUCH DAMAGE. 34 1.1 cgd * 35 1.1 cgd * from: Header: brk.s,v 1.3 92/06/25 12:56:05 mccanne Exp 36 1.1 cgd */ 37 1.1 cgd 38 1.3 christos #include <machine/asm.h> 39 1.3 christos #if defined(SYSLIBC_SCCS) && !defined(lint) 40 1.3 christos #if 0 41 1.1 cgd .asciz "@(#)brk.s 8.1 (Berkeley) 6/4/93" 42 1.3 christos #else 43 1.12 uwe RCSID("$NetBSD: brk.S,v 1.12 2007/10/08 13:06:00 uwe Exp $") 44 1.3 christos #endif 45 1.3 christos #endif /* SYSLIBC_SCCS and not lint */ 46 1.1 cgd 47 1.1 cgd #include "SYS.h" 48 1.1 cgd 49 1.6 kleink .globl CURBRK 50 1.5 kleink .globl _C_LABEL(__minbrk) 51 1.7 kleink .globl _end 52 1.1 cgd 53 1.8 kleink #ifdef WEAK_ALIAS 54 1.8 kleink WEAK_ALIAS(brk, _brk) 55 1.8 kleink #endif 56 1.8 kleink 57 1.1 cgd .data 58 1.5 kleink _C_LABEL(__minbrk): 59 1.7 kleink .long _end ! lower brk limit; also for gmon code 60 1.1 cgd .text 61 1.1 cgd 62 1.8 kleink ENTRY(_brk) 63 1.2 pk #ifdef PIC 64 1.2 pk PIC_PROLOGUE(%o5,%o4) 65 1.12 uwe set _C_LABEL(__minbrk), %o4 66 1.12 uwe ld [%o5 + %o4], %o4 67 1.2 pk ld [%o4], %o1 ! %o1 = minbrk 68 1.2 pk cmp %o1, %o0 ! if (minbrk > %o0) 69 1.11 martin bgu,a 0f 70 1.2 pk mov %o1, %o0 ! %o0 = minbrk 71 1.2 pk 0: 72 1.2 pk mov %o0, %o2 ! save argument to syscall 73 1.2 pk mov SYS_break, %g1 74 1.2 pk t ST_SYSCALL 75 1.2 pk bcc,a 1f 76 1.6 kleink ld [%o5 + CURBRK], %o4 77 1.2 pk ERROR() 78 1.2 pk 1: 79 1.2 pk retl ! success, return 0 & record new break 80 1.2 pk st %o2, [%o4] 81 1.2 pk #else 82 1.5 kleink sethi %hi(_C_LABEL(__minbrk)), %o1 ! %o1 = minbrk 83 1.5 kleink ld [%o1 + %lo(_C_LABEL(__minbrk))], %o1 84 1.1 cgd cmp %o1, %o0 ! if (minbrk > %o0) 85 1.11 martin bgu,a 0f 86 1.1 cgd mov %o1, %o0 ! %o0 = minbrk 87 1.1 cgd 0: 88 1.1 cgd mov %o0, %o2 ! save argument to syscall 89 1.1 cgd mov SYS_break, %g1 90 1.1 cgd t ST_SYSCALL 91 1.1 cgd bcc,a 1f 92 1.6 kleink sethi %hi(CURBRK), %g1 93 1.1 cgd ERROR() 94 1.1 cgd 1: 95 1.1 cgd retl ! success, return 0 & record new break 96 1.6 kleink st %o2, [%g1 + %lo(CURBRK)] 97 1.2 pk #endif 98
Indexes created Thu Oct 02 07:10:07 GMT 2025