brk.S revision 1.15.2.2
1 1.15.2.2 nakayama /* $NetBSD: brk.S,v 1.15.2.2 2008/11/06 13:42:56 nakayama Exp $ */ 2 1.15.2.2 nakayama 3 1.15.2.2 nakayama /* 4 1.15.2.2 nakayama * Copyright (c) 1992, 1993 5 1.15.2.2 nakayama * The Regents of the University of California. All rights reserved. 6 1.15.2.2 nakayama * 7 1.15.2.2 nakayama * This software was developed by the Computer Systems Engineering group 8 1.15.2.2 nakayama * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 1.15.2.2 nakayama * contributed to Berkeley. 10 1.15.2.2 nakayama * 11 1.15.2.2 nakayama * Redistribution and use in source and binary forms, with or without 12 1.15.2.2 nakayama * modification, are permitted provided that the following conditions 13 1.15.2.2 nakayama * are met: 14 1.15.2.2 nakayama * 1. Redistributions of source code must retain the above copyright 15 1.15.2.2 nakayama * notice, this list of conditions and the following disclaimer. 16 1.15.2.2 nakayama * 2. Redistributions in binary form must reproduce the above copyright 17 1.15.2.2 nakayama * notice, this list of conditions and the following disclaimer in the 18 1.15.2.2 nakayama * documentation and/or other materials provided with the distribution. 19 1.15.2.2 nakayama * 3. Neither the name of the University nor the names of its contributors 20 1.15.2.2 nakayama * may be used to endorse or promote products derived from this software 21 1.15.2.2 nakayama * without specific prior written permission. 22 1.15.2.2 nakayama * 23 1.15.2.2 nakayama * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 1.15.2.2 nakayama * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 1.15.2.2 nakayama * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 1.15.2.2 nakayama * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 1.15.2.2 nakayama * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 1.15.2.2 nakayama * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 1.15.2.2 nakayama * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 1.15.2.2 nakayama * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 1.15.2.2 nakayama * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 1.15.2.2 nakayama * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 1.15.2.2 nakayama * SUCH DAMAGE. 34 1.15.2.2 nakayama * 35 1.15.2.2 nakayama * from: Header: brk.s,v 1.3 92/06/25 12:56:05 mccanne Exp 36 1.15.2.2 nakayama */ 37 1.15.2.2 nakayama 38 1.15.2.2 nakayama #include <machine/asm.h> 39 1.15.2.2 nakayama #if defined(SYSLIBC_SCCS) && !defined(lint) 40 1.15.2.2 nakayama #if 0 41 1.15.2.2 nakayama .asciz "@(#)brk.s 8.1 (Berkeley) 6/4/93" 42 1.15.2.2 nakayama #else 43 1.15.2.2 nakayama RCSID("$NetBSD: brk.S,v 1.15.2.2 2008/11/06 13:42:56 nakayama Exp $") 44 1.15.2.2 nakayama #endif 45 1.15.2.2 nakayama #endif /* SYSLIBC_SCCS and not lint */ 46 1.15.2.2 nakayama 47 1.15.2.2 nakayama #include "SYS.h" 48 1.15.2.2 nakayama 49 1.15.2.2 nakayama .globl CURBRK 50 1.15.2.2 nakayama .globl _C_LABEL(__minbrk) 51 1.15.2.2 nakayama .globl _end 52 1.15.2.2 nakayama 53 1.15.2.2 nakayama #ifdef WEAK_ALIAS 54 1.15.2.2 nakayama WEAK_ALIAS(brk, _brk) 55 1.15.2.2 nakayama #endif 56 1.15.2.2 nakayama 57 1.15.2.2 nakayama .data 58 1.15.2.2 nakayama _C_LABEL(__minbrk): 59 1.15.2.2 nakayama .long _end ! lower brk limit; also for gmon code 60 1.15.2.2 nakayama .text 61 1.15.2.2 nakayama 62 1.15.2.2 nakayama ENTRY(_brk) 63 1.15.2.2 nakayama #ifdef PIC 64 1.15.2.2 nakayama PIC_PROLOGUE(%o5,%o4) 65 1.15.2.2 nakayama set _C_LABEL(__minbrk), %o4 66 1.15.2.2 nakayama ld [%o5 + %o4], %o4 67 1.15.2.2 nakayama ld [%o4], %o1 ! %o1 = minbrk 68 1.15.2.2 nakayama cmp %o1, %o0 ! if (minbrk > %o0) 69 1.15.2.2 nakayama bgu,a 0f 70 1.15.2.2 nakayama mov %o1, %o0 ! %o0 = minbrk 71 1.15.2.2 nakayama 0: 72 1.15.2.2 nakayama mov %o0, %o2 ! save argument to syscall 73 1.15.2.2 nakayama mov SYS_break, %g1 74 1.15.2.2 nakayama t ST_SYSCALL 75 1.15.2.2 nakayama set CURBRK, %o3 76 1.15.2.2 nakayama bcc,a 1f 77 1.15.2.2 nakayama ld [%o5 + %o3], %o4 78 1.15.2.2 nakayama ERROR() 79 1.15.2.2 nakayama 1: 80 1.15.2.2 nakayama retl ! success, return 0 & record new break 81 1.15.2.2 nakayama st %o2, [%o4] 82 1.15.2.2 nakayama #else 83 1.15.2.2 nakayama sethi %hi(_C_LABEL(__minbrk)), %o1 ! %o1 = minbrk 84 1.15.2.2 nakayama ld [%o1 + %lo(_C_LABEL(__minbrk))], %o1 85 1.15.2.2 nakayama cmp %o1, %o0 ! if (minbrk > %o0) 86 1.15.2.2 nakayama bgu,a 0f 87 1.15.2.2 nakayama mov %o1, %o0 ! %o0 = minbrk 88 1.15.2.2 nakayama 0: 89 1.15.2.2 nakayama mov %o0, %o2 ! save argument to syscall 90 1.15.2.2 nakayama mov SYS_break, %g1 91 1.15.2.2 nakayama t ST_SYSCALL 92 1.15.2.2 nakayama bcc,a 1f 93 1.15.2.2 nakayama sethi %hi(CURBRK), %g1 94 1.15.2.2 nakayama ERROR() 95 1.15.2.2 nakayama 1: 96 1.15.2.2 nakayama retl ! success, return 0 & record new break 97 1.15.2.2 nakayama st %o2, [%g1 + %lo(CURBRK)] 98 1.15.2.2 nakayama #endif 99
Indexes created Thu Oct 02 07:10:07 GMT 2025