minix/sys/arch/i386/stand/lib/dump_eax.S

60 lines
2.2 KiB
ArmAsm
Raw Normal View History

/* $NetBSD: dump_eax.S,v 1.4 2009/11/19 22:08:14 dsl Exp $ */
/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by David Laight.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <machine/asm.h>
/* This is useful for debugging - although you may need to
* delete some code to fit it in.
* %ds:dump_eax_buff must be somewhere it is safe to write 10 bytes.
*/
ENTRY(dump_eax)
.code16
pusha /* saves bottom 16 bits only! */
movw $dump_eax_buff, %si
mov %si, %di
movw $8, %cx
1: roll $4, %eax
push %ax
andb $0x0f, %al
addb $0x30, %al /* 30..3f - clear AF */
#if 1 /* 5 bytes to generate real hex... */
daa /* 30..39, 40..45 */
addb $0xc0, %al /* f0..f9, 00..05 */
adcb $0x40, %al /* 30..39, 41..46 */
#endif
mov %al,(%di)
inc %di
pop %ax
loop 1b
movw $0x20,(%di) /* space + NIL */
jmp message_1