util.isa

来自「M5,一个功能强大的多处理器系统模拟器.很多针对处理器架构,性能的研究都使用它作」· ISA 代码 · 共 334 行

////////////////////////////////////////////////////////////////////
//
// Mem utility templates and functions
//

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(sext<13>(SIMM13))
            {}

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

            const int32_t imm;
        };
}};

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

            printMnemonic(response, mnemonic);
            if(store)
            {
                printReg(response, _srcRegIdx[0]);
                ccprintf(response, ", ");
            }
            ccprintf(response, "[");
            if(_srcRegIdx[!store ? 0 : 1] != 0)
            {
                printSrcReg(response, !store ? 0 : 1);
                ccprintf(response, " + ");
            }
            printSrcReg(response, !store ? 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, "[");
            if(_srcRegIdx[!save ? 0 : 1] != 0)
            {
                printReg(response, _srcRegIdx[!save ? 0 : 1]);
                ccprintf(response, " + ");
            }
            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();
        }
}};

//This template provides the execute functions for a load
def template LoadExecute {{
        Fault %(class_name)s::execute(%(CPU_exec_context)s *xc,
                Trace::InstRecord *traceData) const
        {
            Fault fault = NoFault;
            Addr EA;
            %(fp_enable_check)s;
            %(op_decl)s;
            %(op_rd)s;
            %(ea_code)s;
            DPRINTF(Sparc, "%s: The address is 0x%x\n", mnemonic, EA);
            %(fault_check)s;
            if(fault == NoFault)
            {
                %(EA_trunc)s
                fault = xc->read(EA, (%(mem_acc_type)s%(mem_acc_size)s_t&)Mem, %(asi_val)s);
            }
            if(fault == NoFault)
            {
                %(code)s;
            }
            if(fault == NoFault)
            {
                    //Write the resulting state to the execution context
                    %(op_wb)s;
            }

            return fault;
        }
}};

def template LoadInitiateAcc {{
        Fault %(class_name)s::initiateAcc(%(CPU_exec_context)s * xc,
                Trace::InstRecord * traceData) const
        {
            Fault fault = NoFault;
            Addr EA;
            %(fp_enable_check)s;
            %(op_decl)s;
            %(op_rd)s;
            %(ea_code)s;
            DPRINTF(Sparc, "%s: The address is 0x%x\n", mnemonic, EA);
            %(fault_check)s;
            if(fault == NoFault)
            {
                %(EA_trunc)s
                fault = xc->read(EA, (%(mem_acc_type)s%(mem_acc_size)s_t&)Mem, %(asi_val)s);
            }
            return fault;
        }
}};

def template LoadCompleteAcc {{
        Fault %(class_name)s::completeAcc(PacketPtr pkt, %(CPU_exec_context)s * xc,
                Trace::InstRecord * traceData) const
        {
            Fault fault = NoFault;
            %(op_decl)s;
            %(op_rd)s;
            Mem = pkt->get<typeof(Mem)>();
            %(code)s;
            if(fault == NoFault)
            {
                %(op_wb)s;
            }
            return fault;
        }
}};

//This template provides the execute functions for a store
def template StoreExecute {{
        Fault %(class_name)s::execute(%(CPU_exec_context)s *xc,
                Trace::InstRecord *traceData) const
        {
            Fault fault = NoFault;
            //This is to support the conditional store in cas instructions.
            //It should be optomized out in all the others
            bool storeCond = true;
            Addr EA;
            %(fp_enable_check)s;
            %(op_decl)s;
            %(op_rd)s;
            %(ea_code)s;
            DPRINTF(Sparc, "%s: The address is 0x%x\n", mnemonic, EA);
            %(fault_check)s;
            if(fault == NoFault)
            {
                %(code)s;
            }
            if(storeCond && fault == NoFault)
            {
                %(EA_trunc)s
                fault = xc->write((%(mem_acc_type)s%(mem_acc_size)s_t)Mem,
                        EA, %(asi_val)s, 0);
            }
            if(fault == NoFault)
            {
                    //Write the resulting state to the execution context
                    %(op_wb)s;
            }

            return fault;
        }
}};

def template StoreInitiateAcc {{
        Fault %(class_name)s::initiateAcc(%(CPU_exec_context)s * xc,
                Trace::InstRecord * traceData) const
        {
            Fault fault = NoFault;
            bool storeCond = true;
            Addr EA;
            %(fp_enable_check)s;
            %(op_decl)s;

            %(op_rd)s;
            %(ea_code)s;
            DPRINTF(Sparc, "%s: The address is 0x%x\n", mnemonic, EA);
            %(fault_check)s;
            if(fault == NoFault)
            {
                %(code)s;
            }
            if(storeCond && fault == NoFault)
            {
                %(EA_trunc)s
                fault = xc->write((%(mem_acc_type)s%(mem_acc_size)s_t)Mem,
                        EA, %(asi_val)s, 0);
            }
            if(fault == NoFault)
            {
                    //Write the resulting state to the execution context
                %(op_wb)s;
            }
            return fault;
        }
}};

def template StoreCompleteAcc {{
        Fault %(class_name)s::completeAcc(PacketPtr, %(CPU_exec_context)s * xc,
                Trace::InstRecord * traceData) const
        {
            return NoFault;
        }
}};

//This delcares the initiateAcc function in memory operations
def template InitiateAccDeclare {{
    Fault initiateAcc(%(CPU_exec_context)s *, Trace::InstRecord *) const;
}};

//This declares the completeAcc function in memory operations
def template CompleteAccDeclare {{
    Fault completeAcc(PacketPtr, %(CPU_exec_context)s *, Trace::InstRecord *) const;
}};

//Here are some code snippets which check for various fault conditions
let {{
    LoadFuncs = [LoadExecute, LoadInitiateAcc, LoadCompleteAcc]
    StoreFuncs = [StoreExecute, StoreInitiateAcc, StoreCompleteAcc]

    # The LSB can be zero, since it's really the MSB in doubles and quads
    # and we're dealing with doubles
    BlockAlignmentFaultCheck = '''
        if(RD & 0xe)
            fault = new IllegalInstruction;
        else if(EA & 0x3f)
            fault = new MemAddressNotAligned;
    '''
    TwinAlignmentFaultCheck = '''
        if(RD & 0x1)
            fault = new IllegalInstruction;
        else if(EA & 0xf)
            fault = new MemAddressNotAligned;
    '''
    # XXX Need to take care of pstate.hpriv as well. The lower ASIs
    # are split into ones that are available in priv and hpriv, and
    # those that are only available in hpriv
    AlternateASIPrivFaultCheck = '''
        if(!bits(Pstate,2,2) && !bits(Hpstate,2,2) && !AsiIsUnPriv((ASI)EXT_ASI) ||
                             !bits(Hpstate,2,2) && AsiIsHPriv((ASI)EXT_ASI))
                fault = new PrivilegedAction;
        else if(AsiIsAsIfUser((ASI)EXT_ASI) && !bits(Pstate,2,2))
            fault = new PrivilegedAction;
    '''

    TruncateEA = '''
#if !FULL_SYSTEM
                EA = Pstate<3:> ? EA<31:0> : EA;
#endif
    '''
}};

//A simple function to generate the name of the macro op of a certain
//instruction at a certain micropc
let {{
    def makeMicroName(name, microPc):
            return name + "::" + name + "_" + str(microPc)
}};

//This function properly generates the execute functions for one of the
//templates above. This is needed because in one case, ea computation,
//fault checks and the actual code all occur in the same function,
//and in the other they're distributed across two. Also note that for
//execute functions, the name of the base class doesn't matter.
let {{
    def doSplitExecute(execute, name, Name, asi, opt_flags, microParam):
        microParam["asi_val"] = asi;
        iop = InstObjParams(name, Name, '', microParam, opt_flags)
        (execf, initf, compf) = execute
        return execf.subst(iop) + initf.subst(iop) + compf.subst(iop)


    def doDualSplitExecute(code, postacc_code, eaRegCode, eaImmCode, execute,
            faultCode, nameReg, nameImm, NameReg, NameImm, asi, opt_flags):
        executeCode = ''
        for (eaCode, name, Name) in (
                (eaRegCode, nameReg, NameReg),
                (eaImmCode, nameImm, NameImm)):
            microParams = {"code": code, "postacc_code" : postacc_code,
                "ea_code": eaCode, "fault_check": faultCode,
                "EA_trunc" : TruncateEA}
            executeCode += doSplitExecute(execute, name, Name,
                    asi, opt_flags, microParams)
        return executeCode
}};