gem5/src/arch/mips/isa/formats/trap.isa

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//Authors: Korey L. Sewell
//         Jaidev Patwardhan

////////////////////////////////////////////////////////////////////
//
// Trap instructions
//

output header {{
        /**
         * Base class for integer operations.
         */
        class Trap : public MipsStaticInst
        {
                protected:

                /// Constructor
                Trap(const char *mnem, MachInst _machInst, OpClass __opClass) : MipsStaticInst(mnem, _machInst, __opClass)
                {
                }

                std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
        };
        class TrapImm : public MipsStaticInst
        {
                protected:

                int16_t imm;

                /// Constructor
                TrapImm(const char *mnem, MachInst _machInst, OpClass __opClass) :
                    MipsStaticInst(mnem, _machInst, __opClass),imm(INTIMM)
                {
                }

                std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;


        };

}};

output decoder {{
        std::string Trap::generateDisassembly(Addr pc, const SymbolTable *symtab) const
        {
                return "Disassembly of trap instruction\n";
        }
        std::string TrapImm::generateDisassembly(Addr pc, const SymbolTable *symtab) const
        {
                return "Disassembly of trap instruction\n";
        }
}};

def template TrapExecute {{
        //Edit This Template When Traps Are Implemented
        Fault %(class_name)s::execute(%(CPU_exec_context)s *xc, Trace::InstRecord *traceData) const
        {
                //Write the resulting state to the execution context
                %(op_wb)s;

                //Call into the trap handler with the appropriate fault
                return No_Fault;
        }
}};
def format Trap(code, *flags) {{

        code ='bool cond;\n' + code
        code += 'if (cond) {\n'
        code += 'fault = new TrapFault();\n};'

        iop = InstObjParams(name, Name, 'MipsStaticInst', code, flags)
        header_output = BasicDeclare.subst(iop)
        decoder_output = BasicConstructor.subst(iop)
        decode_block = BasicDecode.subst(iop)
        exec_output = BasicExecute.subst(iop)
}};
def format TrapImm(code, *flags) {{

        code ='bool cond;\n' + code
        code += 'if (cond) {\n'
        code += 'fault = new TrapFault();\n};'
        iop = InstObjParams(name, Name, 'MipsStaticInst', code, flags)
        header_output = BasicDeclare.subst(iop)
        decoder_output = BasicConstructor.subst(iop)
        decode_block = BasicDecode.subst(iop)
        exec_output = BasicExecute.subst(iop)
}};