xref: /gem5/src/arch/sparc/isa/formats/mem/basicmem.isa

////////////////////////////////////////////////////////////////////
//
// Mem instructions
//

output header {{
        /**
         * Base class for memory operations.
         */
        class Mem : public SparcStaticInst
        {
          protected:

            // Constructor
            Mem(const char *mnem, ExtMachInst _machInst, OpClass __opClass) :
                SparcStaticInst(mnem, _machInst, __opClass)
            {
            }

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

        /**
         * Class for memory operations which use an immediate offset.
         */
        class MemImm : public Mem
        {
          protected:

            // Constructor
            MemImm(const char *mnem, ExtMachInst _machInst, OpClass __opClass) :
                Mem(mnem, _machInst, __opClass)
            {
                imm = sign_ext(SIMM13, 13);
            }

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

            int32_t imm;
        };
}};

output decoder {{
        std::string Mem::generateDisassembly(Addr pc,
                const SymbolTable *symtab) const
        {
            std::stringstream response;
            bool load = flags[IsLoad];
            bool save = flags[IsStore];

            printMnemonic(response, mnemonic);
            if(save)
            {
                printReg(response, _srcRegIdx[0]);
                ccprintf(response, ", ");
            }
            ccprintf(response, "[ ");
            printReg(response, _srcRegIdx[!save ? 0 : 1]);
            ccprintf(response, " + ");
            printReg(response, _srcRegIdx[!save ? 1 : 2]);
            ccprintf(response, " ]");
            if(load)
            {
                ccprintf(response, ", ");
                printReg(response, _destRegIdx[0]);
            }

            return response.str();
        }

        std::string MemImm::generateDisassembly(Addr pc,
                const SymbolTable *symtab) const
        {
            std::stringstream response;
            bool load = flags[IsLoad];
            bool save = flags[IsStore];

            printMnemonic(response, mnemonic);
            if(save)
            {
                printReg(response, _srcRegIdx[0]);
                ccprintf(response, ", ");
            }
            ccprintf(response, "[ ");
            printReg(response, _srcRegIdx[!save ? 0 : 1]);
            if(imm >= 0)
                ccprintf(response, " + 0x%x ]", imm);
            else
                ccprintf(response, " + -0x%x ]", -imm);
            if(load)
            {
                ccprintf(response, ", ");
                printReg(response, _destRegIdx[0]);
            }

            return response.str();
        }
}};

def template MemExecute {{
        Fault %(class_name)s::execute(%(CPU_exec_context)s *xc,
                Trace::InstRecord *traceData) const
        {
            Fault fault = NoFault;
            Addr EA;
            %(op_decl)s;
            %(op_rd)s;
            %(ea_code)s;
            DPRINTF(Sparc, "The address is 0x%x\n", EA);
            %(load)s;
            %(code)s;
            %(store)s;

            if(fault == NoFault)
            {
                //Write the resulting state to the execution context
                %(op_wb)s;
            }

            return fault;
        }
}};

let {{
    # Leave memAccessFlags at 0 for now
    loadString = "xc->read(EA, (uint%(width)s_t&)Mem, 0);"
    storeString = "uint64_t write_result = 0; \
    xc->write((uint%(width)s_t)Mem, EA, 0, &write_result);"

    def doMemFormat(code, load, store, name, Name, opt_flags):
        addrCalcReg = 'EA = Rs1 + Rs2;'
        addrCalcImm = 'EA = Rs1 + imm;'
        iop = InstObjParams(name, Name, 'Mem', code,
                opt_flags, ("ea_code", addrCalcReg),
                ("load", load), ("store", store))
        iop_imm = InstObjParams(name, Name + 'Imm', 'MemImm', code,
                opt_flags, ("ea_code", addrCalcImm),
                ("load", load), ("store", store))
        header_output = BasicDeclare.subst(iop) + BasicDeclare.subst(iop_imm)
        decoder_output = BasicConstructor.subst(iop) + BasicConstructor.subst(iop_imm)
        decode_block = ROrImmDecode.subst(iop)
        exec_output = MemExecute.subst(iop) + MemExecute.subst(iop_imm)
        return (header_output, decoder_output, exec_output, decode_block)
}};

def format Load(code, width, *opt_flags) {{
        (header_output,
         decoder_output,
         exec_output,
         decode_block) = doMemFormat(code,
             loadString % {"width":width}, '', name, Name, opt_flags)
}};

def format Store(code, width, *opt_flags) {{
        (header_output,
         decoder_output,
         exec_output,
         decode_block) = doMemFormat(code, '',
             storeString % {"width":width}, name, Name, opt_flags)
}};

def format LoadStore(code, width, *opt_flags) {{
        (header_output,
         decoder_output,
         exec_output,
         decode_block) = doMemFormat(code,
             loadString % {"width":width}, storeString % {"width":width},
             name, Name, opt_flags)
}};