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File: [cvs.NetBSD.org] / src / sys / ddb / db_access.c (download)

Revision 1.18, Wed Feb 21 22:59:56 2007 UTC (13 years, 8 months ago) by thorpej
Branch: MAIN
CVS Tags: yamt-x86pmap-base4, yamt-x86pmap-base3, yamt-x86pmap-base2, yamt-x86pmap-base, yamt-x86pmap, yamt-pf42-baseX, yamt-pf42-base4, yamt-pf42-base3, yamt-pf42-base2, yamt-pf42-base, yamt-pf42, yamt-nfs-mp-base2, yamt-nfs-mp-base, yamt-lazymbuf-base15, yamt-lazymbuf-base14, yamt-kmem-base3, yamt-kmem-base2, yamt-kmem-base, yamt-kmem, yamt-idlelwp-base8, wrstuden-revivesa-base-4, wrstuden-revivesa-base-3, wrstuden-revivesa-base-2, wrstuden-revivesa-base-1, wrstuden-revivesa-base, wrstuden-revivesa, vmlocking2-base3, vmlocking2-base2, vmlocking2-base1, vmlocking2, vmlocking-nbase, vmlocking-base, vmlocking, thorpej-atomic-base, thorpej-atomic, simonb-wapbl-nbase, simonb-wapbl-base, simonb-wapbl, reinoud-bufcleanup-nbase, reinoud-bufcleanup-base, reinoud-bufcleanup, nick-net80211-sync-base, nick-net80211-sync, nick-hppapmap-base2, nick-csl-alignment-base5, nick-csl-alignment-base, nick-csl-alignment, netbsd-5-base, netbsd-5-2-RELEASE, netbsd-5-2-RC1, netbsd-5-2-3-RELEASE, netbsd-5-2-2-RELEASE, netbsd-5-2-1-RELEASE, netbsd-5-2, netbsd-5-1-RELEASE, netbsd-5-1-RC4, netbsd-5-1-RC3, netbsd-5-1-RC2, netbsd-5-1-RC1, netbsd-5-1-5-RELEASE, netbsd-5-1-4-RELEASE, netbsd-5-1-3-RELEASE, netbsd-5-1-2-RELEASE, netbsd-5-1-1-RELEASE, netbsd-5-1, netbsd-5-0-RELEASE, netbsd-5-0-RC4, netbsd-5-0-RC3, netbsd-5-0-RC2, netbsd-5-0-RC1, netbsd-5-0-2-RELEASE, netbsd-5-0-1-RELEASE, netbsd-5-0, netbsd-5, mjf-ufs-trans-base, mjf-ufs-trans, mjf-devfs2-base, mjf-devfs2, mjf-devfs-base, mjf-devfs, matt-nb5-pq3-base, matt-nb5-pq3, matt-nb5-mips64-u2-k2-k4-k7-k8-k9, matt-nb5-mips64-u1-k1-k5, matt-nb5-mips64-premerge-20101231, matt-nb5-mips64-premerge-20091211, matt-nb5-mips64-k15, matt-nb5-mips64, matt-nb4-mips64-k7-u2a-k9b, matt-mips64-base2, matt-mips64-base, matt-mips64, matt-armv6-prevmlocking, matt-armv6-nbase, matt-armv6-base, matt-armv6, keiichi-mipv6-nbase, keiichi-mipv6-base, keiichi-mipv6, jmcneill-pm-base, jmcneill-pm, jmcneill-base, hpcarm-cleanup-nbase, hpcarm-cleanup-base, hpcarm-cleanup, haad-nbase2, haad-dm-base2, haad-dm-base1, haad-dm-base, haad-dm, cube-autoconf-base, cube-autoconf, bouyer-xeni386-nbase, bouyer-xeni386-merge1, bouyer-xeni386-base, bouyer-xeni386, bouyer-xenamd64-base2, bouyer-xenamd64-base, bouyer-xenamd64, ad-socklock-base1, ad-audiomp2-base, ad-audiomp2, ad-audiomp-base, ad-audiomp
Branch point for: yamt-nfs-mp, nick-hppapmap, jym-xensuspend
Changes since 1.17: +3 -3 lines

Replace the Mach-derived boolean_t type with the C99 bool type.  A
future commit will replace use of TRUE and FALSE with true and false.

/*	$NetBSD: db_access.c,v 1.18 2007/02/21 22:59:56 thorpej 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 "AS IS"
 * 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
 * rights to redistribute these changes.
 *
 *	Author: David B. Golub, Carnegie Mellon University
 *	Date:	7/90
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: db_access.c,v 1.18 2007/02/21 22:59:56 thorpej Exp $");

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

const int db_extend[] = {	/* table for sign-extending */
	0,
	0xFFFFFF80,
	0xFFFF8000,
	0xFF800000
};

db_expr_t
db_get_value(db_addr_t addr, size_t size, bool is_signed)
{
	char data[sizeof(db_expr_t)];
	db_expr_t value;
	size_t i;

	db_read_bytes(addr, size, data);

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

	if (size < 4 && is_signed && (value & db_extend[size]) != 0)
		value |= db_extend[size];
	return (value);
}

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

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

	db_write_bytes(addr, size, data);
}