1/* $NetBSD: iris_start.S,v 1.1 2019/01/12 16:44:47 tsutsui Exp $ */ 2 3/* 4 * Copyright (c) 2018 Naruaki Etomi 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28/* 29 * Silicon Graphics "IRIS" series MIPS processors machine bootloader. 30 */ 31 32#include <mips/asm.h> 33#include <mips/cpuregs.h> 34 35 .globl start 36start: 37 .set noreorder 38#ifdef __GP_SUPPORT__ 39 la gp, _C_LABEL(_gp) 40#endif 41 /* 42 * We assume the bootprom isn't expecting us to preserve the saved 43 * registers. 44 */ 45 move s0, a0 # save argc 46 move s1, a1 # save argv 47 move s2, a2 # save envp 48 move s3, ra # save RA 49 50 la a0, _C_LABEL(edata) # clear BSS 51 move a1, zero 52 la a2, _C_LABEL(end) 53 jal _C_LABEL(memset) # memset(edata, 0, end - edata) 54 subu a2, a2, a0 55 56 move a0, s0 # restore argc 57 move a1, s1 # restore argv 58 move a2, s2 # restore envp 59 j _C_LABEL(main) # main(argc, argv) 60 move ra, s3 # restore RA 61 62LEAF(romrestart) 63XLEAF(_rtt) 64 PTR_LA v0, 0xBFC00000 # indigo RESET 65 j v0 66 nop 67END(romrestart) 68