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/* $NetBSD: db_access.c,v 1.23 2018/02/04 09:17:54 mrg 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 1.23 2018/02/04 09:17:54 mrg Exp $");
#if defined(_KERNEL_OPT)
#include "opt_kgdb.h"
#endif
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/endian.h>
#include <ddb/ddb.h>
/*
* Access unaligned data items on aligned (longword)
* boundaries.
*
* This file is shared by ddb, kgdb and crash(8).
*/
#if defined(DDB) || !defined(DDB) && !defined(KGDB)
#define _COMPILE_THIS
#endif
#if defined(_COMPILE_THIS) || defined(KGDB) && defined(SOFTWARE_SSTEP)
db_expr_t
db_get_value(db_addr_t addr, size_t size, bool is_signed)
{
char data[sizeof(db_expr_t)] __aligned(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 < sizeof(db_expr_t) && is_signed
&& (value & ((db_expr_t)1 << (8*size - 1)))) {
value |= (unsigned long)~(db_expr_t)0 << (8*size - 1);
}
return (value);
}
void
db_put_value(db_addr_t addr, size_t size, db_expr_t value)
{
char data[sizeof(db_expr_t)] __aligned(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);
}
#endif /* _COMPILE_THIS || KGDB && SOFTWARE_SSTEP */
#ifdef _COMPILE_THIS
void *
db_read_ptr(const char *name)
{
db_expr_t val;
void *p;
if (!db_value_of_name(name, &val)) {
db_printf("db_read_ptr: cannot find `%s'\n", name);
db_error(NULL);
/* NOTREACHED */
}
db_read_bytes((db_addr_t)val, sizeof(p), (char *)&p);
return p;
}
int
db_read_int(const char *name)
{
db_expr_t val;
int p;
if (!db_value_of_name(name, &val)) {
db_printf("db_read_int: cannot find `%s'\n", name);
db_error(NULL);
/* NOTREACHED */
}
db_read_bytes((db_addr_t)val, sizeof(p), (char *)&p);
return p;
}
#endif /* _COMPILE_THIS */
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