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1.1 root 1: /*
2: * Mach Operating System
3: * Copyright (c) 1991,1990 Carnegie Mellon University
4: * All Rights Reserved.
5: *
6: * Permission to use, copy, modify and distribute this software and its
7: * documentation is hereby granted, provided that both the copyright
8: * notice and this permission notice appear in all copies of the
9: * software, derivative works or modified versions, and any portions
10: * thereof, and that both notices appear in supporting documentation.
11: *
12: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
13: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14: * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15: *
16: * Carnegie Mellon requests users of this software to return to
17: *
18: * Software Distribution Coordinator or [email protected]
19: * School of Computer Science
20: * Carnegie Mellon University
21: * Pittsburgh PA 15213-3890
22: *
23: * any improvements or extensions that they make and grant Carnegie the
24: * rights to redistribute these changes.
25: */
26: /*
1.1.1.3 ! root 27: * db_access.c,v 1.2 1993/05/20 03:39:04 cgd Exp
! 28: *
1.1 root 29: * HISTORY
1.1.1.3 ! root 30: * db_access.c,v
! 31: * Revision 1.2 1993/05/20 03:39:04 cgd
! 32: * add explicit rcs id
! 33: *
! 34: * Revision 1.1 1993/03/21 09:46:24 cgd
! 35: * Initial revision
1.1.1.2 root 36: *
1.1 root 37: * Revision 1.1 1992/03/25 21:44:50 pace
38: * Initial revision
39: *
40: * Revision 2.3 91/02/05 17:05:44 mrt
41: * Changed to new Mach copyright
42: * [91/01/31 16:16:22 mrt]
43: *
44: * Revision 2.2 90/08/27 21:48:20 dbg
45: * Fix type declarations.
46: * [90/08/07 dbg]
47: * Created.
48: * [90/07/25 dbg]
49: *
50: */
51: /*
52: * Author: David B. Golub, Carnegie Mellon University
53: * Date: 7/90
54: */
55: #include "param.h"
56: #include "proc.h"
57: #include <machine/db_machdep.h> /* type definitions */
58:
59: /*
60: * Access unaligned data items on aligned (longword)
61: * boundaries.
62: */
63:
64: extern void db_read_bytes(); /* machine-dependent */
65: extern void db_write_bytes(); /* machine-dependent */
66:
67: int db_extend[] = { /* table for sign-extending */
68: 0,
69: 0xFFFFFF80,
70: 0xFFFF8000,
71: 0xFF800000
72: };
73:
74: db_expr_t
75: db_get_value(addr, size, is_signed)
76: db_addr_t addr;
77: register int size;
78: boolean_t is_signed;
79: {
80: char data[sizeof(int)];
81: register db_expr_t value;
82: register int i;
83:
84: db_read_bytes(addr, size, data);
85:
86: value = 0;
87: #if BYTE_MSF
88: for (i = 0; i < size; i++)
89: #else /* BYTE_LSF */
90: for (i = size - 1; i >= 0; i--)
91: #endif
92: {
93: value = (value << 8) + (data[i] & 0xFF);
94: }
95:
96: if (size < 4) {
97: if (is_signed && (value & db_extend[size]) != 0)
98: value |= db_extend[size];
99: }
100: return (value);
101: }
102:
103: void
104: db_put_value(addr, size, value)
105: db_addr_t addr;
106: register int size;
107: register db_expr_t value;
108: {
109: char data[sizeof(int)];
110: register int i;
111:
112: #if BYTE_MSF
113: for (i = size - 1; i >= 0; i--)
114: #else /* BYTE_LSF */
115: for (i = 0; i < size; i++)
116: #endif
117: {
118: data[i] = value & 0xFF;
119: value >>= 8;
120: }
121:
122: db_write_bytes(addr, size, data);
123: }
124:
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