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dump_eax.S revision 1.2.14.2 
      1  1.2.14.1  jym /*	$NetBSD: dump_eax.S,v 1.2.14.2 2009/11/01 13:58:36 jym Exp $	*/
      2       1.1  dsl 
      3       1.1  dsl /*-
      4       1.1  dsl  * Copyright (c) 2003 The NetBSD Foundation, Inc.
      5       1.1  dsl  * All rights reserved.
      6       1.1  dsl  *
      7       1.1  dsl  * This code is derived from software contributed to The NetBSD Foundation
      8       1.1  dsl  * by David Laight.
      9       1.1  dsl  *
     10       1.1  dsl  * Redistribution and use in source and binary forms, with or without
     11       1.1  dsl  * modification, are permitted provided that the following conditions
     12       1.1  dsl  * are met:
     13       1.1  dsl  * 1. Redistributions of source code must retain the above copyright
     14       1.1  dsl  *    notice, this list of conditions and the following disclaimer.
     15       1.1  dsl  * 2. Redistributions in binary form must reproduce the above copyright
     16       1.1  dsl  *    notice, this list of conditions and the following disclaimer in the
     17       1.1  dsl  *    documentation and/or other materials provided with the distribution.
     18       1.1  dsl  *
     19       1.1  dsl  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20       1.1  dsl  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21       1.1  dsl  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22       1.1  dsl  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23       1.1  dsl  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24       1.1  dsl  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25       1.1  dsl  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26       1.1  dsl  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27       1.1  dsl  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28       1.1  dsl  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29       1.1  dsl  * POSSIBILITY OF SUCH DAMAGE.
     30       1.1  dsl  */
     31       1.1  dsl 
     32       1.1  dsl #include <machine/asm.h>
     33       1.1  dsl 
     34       1.1  dsl /* This is useful for debugging - although you may need to
     35       1.1  dsl  * delete some code to fit it in.
     36       1.1  dsl  * %ds:dump_eax_buff must be somewhere it is safe to write 10 bytes.
     37       1.1  dsl  */
     38       1.1  dsl 
     39       1.1  dsl ENTRY(dump_eax)
     40       1.1  dsl 	.code16
     41       1.1  dsl 	pusha					/* saves bottom 16 bits only! */
     42       1.1  dsl 	push	%es				/* allow for %es != %ds */
     43       1.1  dsl 	push	%ds
     44       1.1  dsl 	pop	%es
     45       1.1  dsl 	movw	$dump_eax_buff, %si
     46       1.1  dsl 	mov	%si, %di
     47       1.1  dsl 	movw	$8, %cx
     48       1.1  dsl 1:	roll	$4, %eax
     49       1.1  dsl 	push	%ax
     50       1.1  dsl 	andb	$0x0f, %al
     51       1.1  dsl 	addb	$0x30, %al			/* 30..3f - clear AF */
     52       1.1  dsl #if 1 /* 5 bytes to generate real hex... */
     53       1.1  dsl 	daa					/* 30..39, 40..45 */
     54       1.1  dsl 	addb	$0xc0, %al			/* f0..f9, 00..05 */
     55  1.2.14.1  jym 	adcb	$0x40, %al			/* 30..39, 41..46 */
     56       1.1  dsl #endif
     57       1.1  dsl 	stosb
     58       1.1  dsl 	pop	%ax
     59       1.1  dsl 	loop	1b
     60       1.1  dsl 	movw	$0x20, %ax			/* space + null */
     61       1.1  dsl 	stosw
     62       1.1  dsl 	pop	%es
     63       1.1  dsl 	jmp	message_1
     64