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File: [local] / src / sys / ddb / db_access.c (download)

Revision 1.7, Sat Jul 19 22:31:14 1997 UTC (26 years, 10 months ago) by niklas
Branch: MAIN
CVS Tags: kame_19991208, SMP_BASE, OPENBSD_3_0_BASE, OPENBSD_3_0, OPENBSD_2_9_BASE, OPENBSD_2_9, OPENBSD_2_8_BASE, OPENBSD_2_8, OPENBSD_2_7_BASE, OPENBSD_2_7, OPENBSD_2_6_BASE, OPENBSD_2_6, OPENBSD_2_5_BASE, OPENBSD_2_5, OPENBSD_2_4_BASE, OPENBSD_2_4, OPENBSD_2_3_BASE, OPENBSD_2_3, OPENBSD_2_2_BASE, OPENBSD_2_2
Branch point for: SMP
Changes since 1.6: +7 -5 lines 

Include vm/vm.h everywhere it is needed to get at boolean_t (I would prefer
to have it in sys/types.h but that is problematic).  Some KNF.

/*	$OpenBSD: db_access.c,v 1.7 1997/07/19 22:31:14 niklas Exp $	*/
/*	$NetBSD: db_access.c,v 1.8 1994/10/09 08:37:35 mycroft Exp $	*/

/* 
 * Mach Operating System
 * Copyright (c) 1991,1990 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS 
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie the
 * the rights to redistribute these changes.
 *
 *	Author: David B. Golub, Carnegie Mellon University
 *	Date:	7/90
 */

#include <sys/param.h>
#include <sys/proc.h>

#include <vm/vm.h>

#include <machine/db_machdep.h>		/* type definitions */
#include <machine/endian.h>

#include <ddb/db_access.h>

/*
 * Access unaligned data items on aligned (longword)
 * boundaries.
 */
db_expr_t
db_get_value(addr, size, is_signed)
	db_addr_t addr;
	size_t size;
	boolean_t is_signed;
{
	char data[sizeof(db_expr_t)];
	db_expr_t value, extend;
	int i;

	db_read_bytes(addr, size, data);

	value = 0;
	extend = (~(db_expr_t)0) << (size * 8 - 1);
#if BYTE_ORDER == LITTLE_ENDIAN
	for (i = size - 1; i >= 0; i--)
#else /* BYTE_ORDER == BIG_ENDIAN */
	for (i = 0; i < size; i++)
#endif /* BYTE_ORDER */
		value = (value << 8) + (data[i] & 0xFF);
	    
	if (size < sizeof(db_expr_t) && is_signed && (value & extend))
		value |= extend;
	return (value);
}

void
db_put_value(addr, size, value)
	db_addr_t addr;
	size_t size;
	db_expr_t value;
{
	char data[sizeof(db_expr_t)];
	int i;

#if BYTE_ORDER == LITTLE_ENDIAN
	for (i = 0; i < size; i++)
#else /* BYTE_ORDER == BIG_ENDIAN */
	for (i = size - 1; i >= 0; i--)
#endif /* BYTE_ORDER */
	{
		data[i] = value & 0xff;
		value >>= 8;
	}

	db_write_bytes(addr, size, data);
}