1/*        $NetBSD: dump_eax.S,v 1.4 2009/11/19 22:08:14 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 *
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 <machine/asm.h>
33
34/* This is useful for debugging - although you may need to
35 * delete some code to fit it in.
36 * %ds:dump_eax_buff must be somewhere it is safe to write 10 bytes.
37 */
38
39ENTRY(dump_eax)
40          .code16
41          pusha                                             /* saves bottom 16 bits only! */
42          movw      $dump_eax_buff, %si
43          mov       %si, %di
44          movw      $8, %cx
451:        roll      $4, %eax
46          push      %ax
47          andb      $0x0f, %al
48          addb      $0x30, %al                              /* 30..3f - clear AF */
49#if 1 /* 5 bytes to generate real hex... */
50          daa                                               /* 30..39, 40..45 */
51          addb      $0xc0, %al                              /* f0..f9, 00..05 */
52          adcb      $0x40, %al                              /* 30..39, 41..46 */
53#endif
54          mov       %al,(%di)
55          inc       %di
56          pop       %ax
57          loop      1b
58          movw      $0x20,(%di)                             /* space + NIL */
59          jmp       message_1
60