95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/* $NetBSD: db_access.c,v 1.17 2002/02/15 07:33:49 simonb 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 1.17 2002/02/15 07:33:49 simonb 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, boolean_t 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);
|
|
}
|