1/* $NetBSD: start.S,v 1.2 2002/11/16 08:55:05 wdk Exp $ */ 2 3/* 4 * Copyright (c) 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Wayne Knowles 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39#include <mips/asm.h> 40#include <mips/cpuregs.h> 41#include <machine/prom.h> 42 43LEAF(start) 44 .set noreorder 45#ifdef __GP_SUPPORT__ 46 la gp, _C_LABEL (_gp) 47#endif 48 la sp, start - CALLFRAME_SIZ 49 sw zero, CALLFRAME_RA(sp) # clear ra for debugger 50 sw zero, CALLFRAME_SP(sp) # clear fp for debugger 51 move s0, a0 # save argc 52 move s1, a1 # save argv 53 54 la a0, _C_LABEL (edata) # clear BSS 55 move a1, zero 56 la a2, _C_LABEL (end) 57 jal _C_LABEL(memset) # memset(edata, 0, end - edata) 58 subu a2, a2, a0 59 60 move a0, s0 # restore argc 61 jal _C_LABEL(main) # main(argc, argv) 62 move a1, s1 # restore argv 63 64XLEAF(_rtt) 65 la t9, _C_LABEL(prom_restart) # restart... 66 j t9 67 move a0, zero 68END(start) 69