st20decoder.h

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/*
 * Copyright (C) 2005, Mike Van Emmerik
 *
 * See the file "LICENSE.TERMS" for information on usage and
 * redistribution of this file, and for a DISCLAIMER OF ALL
 * WARRANTIES.
 *
 */

/*==============================================================================
 * FILE:       st20decoder.h
 * OVERVIEW:   The definition of the instruction decoder for ST20.
 *============================================================================*/

/* 
 * $Revision: 1.1 $
 * 10/Mar/05 MVE and Dr Aus: Created.
 */

#ifndef ST20DECODER
#define ST20DECODER

class Prog;
class NJMCDecoder;
struct DecodeResult;

class ST20Decoder : public NJMCDecoder
{
public:
    /* Default constructor
     */
    ST20Decoder();

    /**
     * Decodes the machine instruction at pc and returns an RTL instance for
     * the instruction.
     */
virtual DecodeResult& decodeInstruction (ADDRESS pc, int delta);

    /*
     * Disassembles the machine instruction at pc and returns the number of
     * bytes disassembled. Assembler output goes to global _assembly
     */
virtual int decodeAssemblyInstruction (ADDRESS pc, int delta);


private:
    /*
     * Various functions to decode the operands of an instruction into
     * a SemStr representation.
     */
    //Exp*  dis_Eaddr(ADDRESS pc, int size = 0);
    //Exp*  dis_RegImm(ADDRESS pc);
    //Exp*  dis_Reg(unsigned r);
    //Exp*  dis_RAmbz(unsigned r);      // Special for rA of certain instructions

    void    unused(int x);
    RTL*    createBranchRtl(ADDRESS pc, std::list<Statement*>* stmts,
              const char* name);
    bool    isFuncPrologue(ADDRESS hostPC);
    DWord   getDword(ADDRESS lc);
    SWord   getWord(ADDRESS lc);
    Byte    getByte(ADDRESS lc);

};

#endif

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