1/* $NetBSD: brk.S,v 1.10 2002/05/07 01:34:22 eeh 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 1.10 2002/05/07 01:34:22 eeh Exp $") 48#endif 49#endif /* SYSLIBC_SCCS and not lint */ 50 51#include "SYS.h" 52 53 .globl _C_LABEL(__curbrk) 54 .globl _C_LABEL(__minbrk) 55 .globl _C_LABEL(_end) 56 57#ifdef WEAK_ALIAS 58WEAK_ALIAS(brk, _brk) 59#endif 60 61 .data 62 .align 8 63_C_LABEL(__minbrk): 64 .xword _C_LABEL(_end) /* lower brk limit; also for gmon code */ 65 .text 66 67ENTRY(_brk) 68#ifdef PIC 69#ifdef BIGPIC 70 PIC_PROLOGUE(%o5,%o4) 71 set _C_LABEL(__minbrk), %o4 72 ldx [%o5 + %o4], %o4 73 ldx [%o4], %o1 /* %o1 = minbrk */ 74 cmp %o1, %o0 /* if (minbrk > %o0) */ 75 movg %xcc, %o1, %o0 /* %o0 = minbrk */ 76 mov %o0, %o2 /* save argument to syscall */ 77 mov SYS_break, %g1 78 t ST_SYSCALL 79 set _C_LABEL(__curbrk), %o3 80 bcc,a,pt %icc, 1f 81 ldx [%o5 + %o3], %o4 82 ERROR() 831: 84 retl /* success, return 0 & record new break */ 85 stx %o2, [%o4] 86#else 87 PIC_PROLOGUE(%o5,%o4) 88 ldx [%o5 + _C_LABEL(__minbrk)], %o4 89 ldx [%o4], %o1 /* %o1 = minbrk */ 90 cmp %o1, %o0 /* if (minbrk > %o0) */ 91 movg %xcc, %o1, %o0 /* %o0 = minbrk */ 92 mov %o0, %o2 /* save argument to syscall */ 93 mov SYS_break, %g1 94 t ST_SYSCALL 95 bcc,a,pt %icc, 1f 96 ldx [%o5 + _C_LABEL(__curbrk)], %o4 97 ERROR() 981: 99 retl /* success, return 0 & record new break */ 100 stx %o2, [%o4] 101#endif 102#else 103 sethi %hi(_C_LABEL(__minbrk)), %o1 /* %o1 = minbrk */ 104 ldx [%o1 + %lo(_C_LABEL(__minbrk))], %o1 105 cmp %o1, %o0 /* if (minbrk > %o0) */ 106 movg %xcc, %o1, %o0 /* %o0 = minbrk */ 107 mov %o0, %o2 /* save argument to syscall */ 108 mov SYS_break, %g1 109 t ST_SYSCALL 110 bcc,a,pt %icc,1f 111 sethi %hi(_C_LABEL(__curbrk)), %g1 112 ERROR() 1131: 114 retl /* success, return 0 & record new break */ 115 stx %o2, [%g1 + %lo(_C_LABEL(__curbrk))] 116#endif 117