1/* $NetBSD: crt0.S,v 1.2 2013/06/25 16:47:47 matt Exp $ */ 2 3/*- 4 * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matt Thomas of 3am Software Foundry. 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include <mips/asm.h> 33 34RCSID("$NetBSD: crt0.S,v 1.2 2013/06/25 16:47:47 matt Exp $") 35 36STRONG_ALIAS(_start,__start) 37 38/* 39 * Assumes kernel (or ld_elf.so) passes the following parameters to 40 * user-space in registers: 41 * 42 * a0 stack pointer (0 if setregs didn't fill this in) 43 * a1 cleanup 44 * a2 Obj_Entry 45 * a3 ps_strings 46 * 47 * XXX Does this violate the ABI? 48 * as well as the usual registers (pc, sp, and t9 == pc for ABI). 49 */ 50 51NESTED_NOPROFILE(__start, CALLFRAME_SIZ, ra) 52 SETUP_GP 53 SETUP_GP64(t3, __start) 54 move a0, a1 /* cleanup */ 55 move a1, a2 /* Obj_Entry */ 56 move a2, a3 /* ps_strings */ 57 j _C_LABEL(___start) 58END(__start) 59