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comparison packages/hal/openrisc/arch/current/include/openrisc_opcode.h @ 964:38840e07f305

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Add OpenRISC port
author jlarmour
date Fri, 25 Apr 2003 04:11:44 +0000
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children 74dbf4c3f2e1
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963:3dd941afc053 964:38840e07f305
1 //=============================================================================
2 //
3 // openrisc_opcode.h
4 //
5 // Define the instruction formats and opcode values for the OpenRISC
6 // instruction set...or at least just enough of them to implement
7 // single-stepping.
8 //
9 //=============================================================================
10 //####ECOSGPLCOPYRIGHTBEGIN####
11 // -------------------------------------------
12 // This file is part of eCos, the Embedded Configurable Operating System.
13 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
14 //
15 // eCos is free software; you can redistribute it and/or modify it under
16 // the terms of the GNU General Public License as published by the Free
17 // Software Foundation; either version 2 or (at your option) any later version.
18 //
19 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
20 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
21 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
22 // for more details.
23 //
24 // You should have received a copy of the GNU General Public License along
25 // with eCos; if not, write to the Free Software Foundation, Inc.,
26 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
27 //
28 // As a special exception, if other files instantiate templates or use macros
29 // or inline functions from this file, or you compile this file and link it
30 // with other works to produce a work based on this file, this file does not
31 // by itself cause the resulting work to be covered by the GNU General Public
32 // License. However the source code for this file must still be made available
33 // in accordance with section (3) of the GNU General Public License.
34 //
35 // This exception does not invalidate any other reasons why a work based on
36 // this file might be covered by the GNU General Public License.
37 //
38 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
39 // at http://sources.redhat.com/ecos/ecos-license/
40 // -------------------------------------------
41 //####ECOSGPLCOPYRIGHTEND####
42 //=============================================================================
43 //#####DESCRIPTIONBEGIN####
44 //
45 // Author(s): sfurman
46 // Contributors:
47 // Date: 2003-02-28
48 // Purpose: Allow dissection of OpenRISC instructions
49 // Description: The types and macros defined here define the instruction
50 // formats of the OpenRISC instruction set...or at least the
51 // very limited subset necessary to allow single-stepping.
52 //
53 //####DESCRIPTIONEND####
54 //
55 //=============================================================================
56
57 #ifndef _OPENRISC_OPCODE_H
58 #define _OPENRISC_OPCODE_H
59
60
61 // Define the instruction formats.
62 typedef union {
63 unsigned word;
64
65 // (Possibly conditional) relative jump w/ immediate displacement
66 struct {
67 unsigned op: 6; // OP_J, OP_JAL, OP_BNF, or OP_BF
68 signed target: 26;
69 } JType;
70
71 // Absolute jump w/ register contents used as PC target address
72 struct {
73 unsigned op: 6; // OP_JR or OP_JALR
74 unsigned unused1:10;
75 unsigned rB: 5; // Register containing new PC
76 unsigned unused2:11;
77 } JRType;
78
79 } InstFmt;
80
81 /*
82 * Values for the 'op' field.
83 */
84 #define OP_J 0x00
85 #define OP_JAL 0x01
86 #define OP_BNF 0x03
87 #define OP_BF 0x04
88 #define OP_RFE 0x09
89 #define OP_JR 0x11
90 #define OP_JALR 0x12
91
92 #endif /* _OPENRISC_OPCODE_H */
93
94 // EOF openrisc_opcode.h