1/* $NetBSD: brk.S,v 1.16 2003/08/07 16:42:17 agc Exp $ */ 2 3/*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Ralph Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35#include <machine/asm.h> 36__FBSDID("$FreeBSD: releng/10.3/lib/libc/mips/sys/brk.S 209521 2010-06-25 05:36:36Z jchandra $"); 37#include "SYS.h" 38 39#if defined(LIBC_SCCS) && !defined(lint) 40 ASMSTR("from: @(#)brk.s 8.1 (Berkeley) 6/4/93") 41 ASMSTR("$NetBSD: brk.S,v 1.16 2003/08/07 16:42:17 agc Exp $") 42#endif /* LIBC_SCCS and not lint */ 43 44 .globl _C_LABEL(minbrk) 45 .globl _C_LABEL(__curbrk) 46 .globl _C_LABEL(_end) 47 48 .data 49_C_LABEL(minbrk): 50 PTR_WORD _C_LABEL(_end) 51 52 .text 53LEAF(__sys_brk) 54 WEAK_ALIAS(brk, __sys_brk) 55 WEAK_ALIAS(_brk, __sys_brk) 56 PIC_PROLOGUE(__sys_brk) 57 PTR_LA v0, _C_LABEL(minbrk) 58 PTR_L v0, 0(v0) 59 bgeu a0, v0, 1f 60 move a0, v0 # dont allow break < minbrk 611: 62 li v0, SYS_break 63 syscall 64 bne a3, zero, 2f 65 PTR_LA t0, _C_LABEL(__curbrk) 66 PTR_S a0, 0(t0) 67 move v0, zero 68 PIC_RETURN() 692: 70 PIC_TAILCALL(__cerror) 71END(__sys_brk) 72