1/* $NetBSD: dump_eax.S,v 1.1 2003/04/16 13:24:09 dsl Exp $ */ 2 3/*- 4 * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by David Laight. 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39#include <machine/asm.h> 40 41/* This is useful for debugging - although you may need to 42 * delete some code to fit it in. 43 * %ds:dump_eax_buff must be somewhere it is safe to write 10 bytes. 44 */ 45 46ENTRY(dump_eax) 47 .code16 48 pusha /* saves bottom 16 bits only! */ 49 push %es /* allow for %es != %ds */ 50 push %ds 51 pop %es 52 movw $dump_eax_buff, %si 53 mov %si, %di 54 movw $8, %cx 551: roll $4, %eax 56 push %ax 57 andb $0x0f, %al 58 addb $0x30, %al /* 30..3f - clear AF */ 59#if 1 /* 5 bytes to generate real hex... */ 60 daa /* 30..39, 40..45 */ 61 addb $0xc0, %al /* f0..f9, 00..05 */ 62 adcb $0x40, %al /* 30..39, 41..45 */ 63#endif 64 stosb 65 pop %ax 66 loop 1b 67 movw $0x20, %ax /* space + null */ 68 stosw 69 pop %es 70 jmp message_1 71