1c34311d57
1.20).
The problem was reported Ty Sarna and Geoff Wing. Thanks.
XXX: I made #if too messy. split db_access.c into two files for
db_{get,put}_values and db_read_{int,ptr}?
141 lines
3.2 KiB
C
141 lines
3.2 KiB
C
/* $NetBSD: db_access.c,v 1.21 2009/09/28 05:53:37 bsh 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 "AS IS"
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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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* 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/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: db_access.c,v 1.21 2009/09/28 05:53:37 bsh Exp $");
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#if defined(_KERNEL_OPT)
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#include "opt_kgdb.h"
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#endif
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/endian.h>
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#include <ddb/ddb.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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* This file is shared by ddb, kgdb and crash(8).
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*/
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#if defined(DDB) || !defined(DDB) && !defined(KGDB)
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#define _COMPILE_THIS
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#endif
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#if defined(_COMPILE_THIS) || defined(KGDB) && defined(SOFTWARE_SSTEP)
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const int db_extend[] = { /* table for sign-extending */
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0,
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0xFFFFFF80,
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0xFFFF8000,
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0xFF800000
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};
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db_expr_t
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db_get_value(db_addr_t addr, size_t size, bool is_signed)
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{
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char data[sizeof(db_expr_t)];
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db_expr_t value;
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size_t i;
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db_read_bytes(addr, size, data);
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value = 0;
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#if BYTE_ORDER == LITTLE_ENDIAN
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for (i = size; i-- > 0;)
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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 < 4 && is_signed && (value & db_extend[size]) != 0)
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value |= db_extend[size];
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return (value);
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}
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void
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db_put_value(db_addr_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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size_t i;
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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; i-- > 0;)
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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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#endif /* _COMPILE_THIS || KGDB && SOFTWARE_SSTEP */
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#ifdef _COMPILE_THIS
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void *
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db_read_ptr(const char *name)
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{
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db_expr_t val;
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void *p;
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if (!db_value_of_name(name, &val)) {
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db_printf("db_read_ptr: cannot find `%s'\n", name);
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db_error(NULL);
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/* NOTREACHED */
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}
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db_read_bytes((db_addr_t)val, sizeof(p), (char *)&p);
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return p;
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}
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int
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db_read_int(const char *name)
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{
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db_expr_t val;
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int p;
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if (!db_value_of_name(name, &val)) {
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db_printf("db_read_int: cannot find `%s'\n", name);
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db_error(NULL);
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/* NOTREACHED */
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}
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db_read_bytes((db_addr_t)val, sizeof(p), (char *)&p);
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return p;
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}
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#endif /* _COMPILE_THIS */
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