808a36ef65
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
/*
|
|
* 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
|
|
* rights to redistribute these changes.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* Author: David B. Golub, Carnegie Mellon University
|
|
* Date: 7/90
|
|
*/
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
|
|
#include <ddb/ddb.h>
|
|
#include <ddb/db_access.h>
|
|
|
|
/*
|
|
* Access unaligned data items on aligned (longword)
|
|
* boundaries.
|
|
*/
|
|
|
|
static unsigned db_extend[] = { /* table for sign-extending */
|
|
0,
|
|
0xFFFFFF80U,
|
|
0xFFFF8000U,
|
|
0xFF800000U
|
|
};
|
|
|
|
db_expr_t
|
|
db_get_value(addr, size, is_signed)
|
|
db_addr_t addr;
|
|
register int size;
|
|
boolean_t is_signed;
|
|
{
|
|
char data[sizeof(int)];
|
|
register db_expr_t value;
|
|
register int i;
|
|
|
|
db_read_bytes(addr, size, data);
|
|
|
|
value = 0;
|
|
#if BYTE_MSF
|
|
for (i = 0; i < size; i++)
|
|
#else /* BYTE_LSF */
|
|
for (i = size - 1; i >= 0; i--)
|
|
#endif
|
|
{
|
|
value = (value << 8) + (data[i] & 0xFF);
|
|
}
|
|
|
|
if (size < 4) {
|
|
if (is_signed && (value & db_extend[size]) != 0)
|
|
value |= db_extend[size];
|
|
}
|
|
return (value);
|
|
}
|
|
|
|
void
|
|
db_put_value(addr, size, value)
|
|
db_addr_t addr;
|
|
register int size;
|
|
register db_expr_t value;
|
|
{
|
|
char data[sizeof(int)];
|
|
register int i;
|
|
|
|
#if BYTE_MSF
|
|
for (i = size - 1; i >= 0; i--)
|
|
#else /* BYTE_LSF */
|
|
for (i = 0; i < size; i++)
|
|
#endif
|
|
{
|
|
data[i] = value & 0xFF;
|
|
value >>= 8;
|
|
}
|
|
|
|
db_write_bytes(addr, size, data);
|
|
}
|
|
|