/* $NetBSD: iris_start.S,v 1.1 2019/01/12 16:44:47 tsutsui Exp $ */ /* * Copyright (c) 2018 Naruaki Etomi * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * Silicon Graphics "IRIS" series MIPS processors machine bootloader. */ #include <mips/asm.h> #include <mips/cpuregs.h> .globl start start: .set noreorder #ifdef __GP_SUPPORT__ la gp, _C_LABEL(_gp) #endif /* * We assume the bootprom isn't expecting us to preserve the saved * registers. */ move s0, a0 # save argc move s1, a1 # save argv move s2, a2 # save envp move s3, ra # save RA la a0, _C_LABEL(edata) # clear BSS move a1, zero la a2, _C_LABEL(end) jal _C_LABEL(memset) # memset(edata, 0, end - edata) subu a2, a2, a0 move a0, s0 # restore argc move a1, s1 # restore argv move a2, s2 # restore envp j _C_LABEL(main) # main(argc, argv) move ra, s3 # restore RA LEAF(romrestart) XLEAF(_rtt) PTR_LA v0, 0xBFC00000 # indigo RESET j v0 nop END(romrestart) |