95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/* $OpenBSD: db_access.c,v 1.16 2019/11/07 13:16:25 mpi Exp $ */
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/* $NetBSD: db_access.c,v 1.8 1994/10/09 08:37:35 mycroft Exp $ */
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/*
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* Mach Operating System
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* Copyright (c) 1991,1990 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* the rights to redistribute these changes.
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*
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* Author: David B. Golub, Carnegie Mellon University
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* Date: 7/90
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*/
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#include <sys/param.h>
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#include <sys/endian.h>
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#include <machine/db_machdep.h> /* type definitions */
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#include <ddb/db_access.h>
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/*
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* Access unaligned data items on aligned (longword)
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* boundaries.
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*/
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db_expr_t
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db_get_value(vaddr_t addr, size_t size, int is_signed)
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{
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char data[sizeof(db_expr_t)];
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db_expr_t value, extend;
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int i;
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#ifdef DIAGNOSTIC
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if (size > sizeof data)
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size = sizeof data;
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#endif
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db_read_bytes(addr, size, data);
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value = 0;
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extend = (~(db_expr_t)0) << (size * 8 - 1);
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#if BYTE_ORDER == LITTLE_ENDIAN
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for (i = size - 1; i >= 0; i--)
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#else /* BYTE_ORDER == BIG_ENDIAN */
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for (i = 0; i < size; i++)
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#endif /* BYTE_ORDER */
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value = (value << 8) + (data[i] & 0xFF);
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if (size < sizeof(db_expr_t) && is_signed && (value & extend))
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value |= extend;
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return (value);
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}
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void
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db_put_value(vaddr_t addr, size_t size, db_expr_t value)
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{
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char data[sizeof(db_expr_t)];
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int i;
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#ifdef DIAGNOSTIC
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if (size > sizeof data)
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size = sizeof data;
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#endif
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#if BYTE_ORDER == LITTLE_ENDIAN
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for (i = 0; i < size; i++)
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#else /* BYTE_ORDER == BIG_ENDIAN */
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for (i = size - 1; i >= 0; i--)
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#endif /* BYTE_ORDER */
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{
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data[i] = value & 0xff;
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value >>= 8;
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}
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db_write_bytes(addr, size, data);
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}
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