1/* $NetBSD: startprog.S,v 1.8 2011/01/10 15:25:44 tsutsui Exp $ */ 2 3/*- 4 * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jonathan Stone, Michael Hitch and Simon Burge. 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/* 33 * startprog(entry, stack, argc, argv, prom_magic, prom_ptr, bi_magic, bi_ptr); 34 * 35 * load new stack pointer, then call 36 * entry(argc, argv, prom_magic, prom_ptr, bi_magic, bi_ptr); 37 */ 38 39#include <mips/asm.h> 40 41 .set noreorder 42LEAF(startprog) 43 subu sp,sp,CALLFRAME_SIZ 44 addu t2,a1,-CALLFRAME_SIZ # new stack value 45 move t9,a0 46 move a0,a2 47 move a1,a3 48 49#ifdef __mips_o32 50 lw a2,CALLFRAME_SIZ+16(sp) # load everything from old stack we need 51 lw a3,CALLFRAME_SIZ+20(sp) 52 lw $8,CALLFRAME_SIZ+24(sp) # use a4/t0 in case N32/N64 kernel 53 lw $9,CALLFRAME_SIZ+28(sp) # use a5/t1 in case N32/N64 kernel 54#else 55 move a2,a4 56 move a3,a5 57 move a4,a6 58 move a5,a7 59#endif 60 61 move sp,t2 # new stack pointer 62 sw ra,CALLFRAME_RA(sp) 63 64 sw $8,16(sp) # save on stack for O32 65 sw $9,20(sp) # save on stack for O32 66 jal ra,t9 67 nop # BDslot 68 69 lw ra,CALLFRAME_RA(sp) # should not get back here! 70 j ra 71 addu sp,sp,CALLFRAME_SIZ 72END(startprog) 73