1*2fe8fb19SBen Gras/* $NetBSD: brk.S,v 1.18 2010/12/12 09:00:37 tsutsui Exp $ */ 2*2fe8fb19SBen Gras 3*2fe8fb19SBen Gras/*- 4*2fe8fb19SBen Gras * Copyright (c) 1991, 1993 5*2fe8fb19SBen Gras * The Regents of the University of California. All rights reserved. 6*2fe8fb19SBen Gras * 7*2fe8fb19SBen Gras * This code is derived from software contributed to Berkeley by 8*2fe8fb19SBen Gras * Ralph Campbell. 9*2fe8fb19SBen Gras * 10*2fe8fb19SBen Gras * Redistribution and use in source and binary forms, with or without 11*2fe8fb19SBen Gras * modification, are permitted provided that the following conditions 12*2fe8fb19SBen Gras * are met: 13*2fe8fb19SBen Gras * 1. Redistributions of source code must retain the above copyright 14*2fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer. 15*2fe8fb19SBen Gras * 2. Redistributions in binary form must reproduce the above copyright 16*2fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer in the 17*2fe8fb19SBen Gras * documentation and/or other materials provided with the distribution. 18*2fe8fb19SBen Gras * 3. Neither the name of the University nor the names of its contributors 19*2fe8fb19SBen Gras * may be used to endorse or promote products derived from this software 20*2fe8fb19SBen Gras * without specific prior written permission. 21*2fe8fb19SBen Gras * 22*2fe8fb19SBen Gras * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23*2fe8fb19SBen Gras * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24*2fe8fb19SBen Gras * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25*2fe8fb19SBen Gras * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26*2fe8fb19SBen Gras * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27*2fe8fb19SBen Gras * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28*2fe8fb19SBen Gras * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29*2fe8fb19SBen Gras * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30*2fe8fb19SBen Gras * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31*2fe8fb19SBen Gras * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32*2fe8fb19SBen Gras * SUCH DAMAGE. 33*2fe8fb19SBen Gras */ 34*2fe8fb19SBen Gras 35*2fe8fb19SBen Gras#include "SYS.h" 36*2fe8fb19SBen Gras 37*2fe8fb19SBen Gras#if defined(LIBC_SCCS) && !defined(lint) 38*2fe8fb19SBen Gras#if 0 39*2fe8fb19SBen Gras RCSID("from: @(#)brk.s 8.1 (Berkeley) 6/4/93") 40*2fe8fb19SBen Gras#else 41*2fe8fb19SBen Gras RCSID("$NetBSD: brk.S,v 1.18 2010/12/12 09:00:37 tsutsui Exp $") 42*2fe8fb19SBen Gras#endif 43*2fe8fb19SBen Gras#endif /* LIBC_SCCS and not lint */ 44*2fe8fb19SBen Gras 45*2fe8fb19SBen Gras .globl _C_LABEL(__minbrk) 46*2fe8fb19SBen Gras .globl _C_LABEL(__curbrk) 47*2fe8fb19SBen Gras .globl _C_LABEL(_end) 48*2fe8fb19SBen Gras 49*2fe8fb19SBen Gras#ifdef WEAK_ALIAS 50*2fe8fb19SBen GrasWEAK_ALIAS(brk, _brk) 51*2fe8fb19SBen Gras#endif 52*2fe8fb19SBen Gras 53*2fe8fb19SBen Gras .data 54*2fe8fb19SBen Gras_C_LABEL(__minbrk): 55*2fe8fb19SBen Gras PTR_WORD _C_LABEL(_end) 56*2fe8fb19SBen Gras .text 57*2fe8fb19SBen Gras 58*2fe8fb19SBen GrasLEAF(_brk) 59*2fe8fb19SBen Gras PIC_PROLOGUE(_brk) 60*2fe8fb19SBen Gras PTR_LA t0, _C_LABEL(__minbrk) 61*2fe8fb19SBen Gras PTR_L v0, 0(t0) 62*2fe8fb19SBen Gras bgeu a0, v0, 1f 63*2fe8fb19SBen Gras move a0, v0 # dont allow break < minbrk 64*2fe8fb19SBen Gras1: 65*2fe8fb19SBen Gras li v0, SYS_break 66*2fe8fb19SBen Gras syscall 67*2fe8fb19SBen Gras bne a3, zero, 2f 68*2fe8fb19SBen Gras PTR_LA t0, _C_LABEL(__curbrk) 69*2fe8fb19SBen Gras PTR_S a0, 0(t0) 70*2fe8fb19SBen Gras move v0, zero 71*2fe8fb19SBen Gras PIC_RETURN() 72*2fe8fb19SBen Gras2: 73*2fe8fb19SBen Gras PIC_TAILCALL(__cerror) 74*2fe8fb19SBen GrasEND(_brk) 75