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