1/* ********************************************************************* 2 * Broadcom Common Firmware Environment (CFE) 3 * 4 * Mini startup module for CFE apps File: minicrt0.S 5 * 6 * About the most minimal startup routine you can get. 7 * 8 * Author: Mitch Lichtenberg 9 * 10 ********************************************************************* 11 * 12 * Copyright 2000,2001,2002,2003 13 * Broadcom Corporation. All rights reserved. 14 * 15 * This software is furnished under license and may be used and 16 * copied only in accordance with the following terms and 17 * conditions. Subject to these conditions, you may download, 18 * copy, install, use, modify and distribute modified or unmodified 19 * copies of this software in source and/or binary form. No title 20 * or ownership is transferred hereby. 21 * 22 * 1) Any source code used, modified or distributed must reproduce 23 * and retain this copyright notice and list of conditions 24 * as they appear in the source file. 25 * 26 * 2) No right is granted to use any trade name, trademark, or 27 * logo of Broadcom Corporation. The "Broadcom Corporation" 28 * name may not be used to endorse or promote products derived 29 * from this software without the prior written permission of 30 * Broadcom Corporation. 31 * 32 * 3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR 33 * IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED 34 * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 35 * PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT 36 * SHALL BROADCOM BE LIABLE FOR ANY DAMAGES WHATSOEVER, AND IN 37 * PARTICULAR, BROADCOM SHALL NOT BE LIABLE FOR DIRECT, INDIRECT, 38 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 39 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 40 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 41 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 42 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 43 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE), EVEN IF ADVISED OF 44 * THE POSSIBILITY OF SUCH DAMAGE. 45 ********************************************************************* */ 46 47 48#include "sbmips.h" 49 50/* 51 * This module should be linked first! 52 */ 53 54#define STACK_SIZE 8192 55 56 .bss 57 .comm stack_bottom,STACK_SIZE 58 .comm __junk,4 59 60 .text 61 62 .extern appletmain 63 .globl __start 64 65__start: 66 67 /* 68 * Set up our GP (in case we're using it) 69 * Set up the stack pointer (don't use CFE's stack) 70 */ 71 72 la gp,_gp 73 la sp,stack_bottom+STACK_SIZE-32 74 75 /* 76 * Zero BSS. No need to do this very efficiently, do it 77 * 32 bits at a time to ensure we can compile this 78 * with -mips1. 79 */ 80 81 la t0,_fbss 82 la t1,_end 83 841: sw zero,0(t0) 85 add t0,4 86 blt t0,t1,1b 87 88 /* 89 * Jump to main program. Note that we didn't trash A0..A3, 90 * our application will need them. So, if you add stuff here, 91 * be sure to preserve the A0..A3 registers for the C code. 92 */ 93 94 j appletmain 95 96