1 //=============================================================================
5 // Define the instruction formats and opcode values for the OpenRISC
6 // instruction set...or at least just enough of them to implement
9 //=============================================================================
10 //####ECOSGPLCOPYRIGHTBEGIN####
11 // -------------------------------------------
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15 // eCos is free software; you can redistribute it and/or modify it under
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40 // -------------------------------------------
41 //####ECOSGPLCOPYRIGHTEND####
42 //=============================================================================
43 //#####DESCRIPTIONBEGIN####
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.
53 //####DESCRIPTIONEND####
55 //=============================================================================
57 #ifndef _OPENRISC_OPCODE_H
58 #define _OPENRISC_OPCODE_H
61 // Define the instruction formats.
65 // (Possibly conditional) relative jump w/ immediate displacement
67 unsigned op: 6; // OP_J, OP_JAL, OP_BNF, or OP_BF
71 // Absolute jump w/ register contents used as PC target address
73 unsigned op: 6; // OP_JR or OP_JALR
75 unsigned rB: 5; // Register containing new PC
82 * Values for the 'op' field.
92 #endif /* _OPENRISC_OPCODE_H */
94 // EOF openrisc_opcode.h