xref: /gem5/src/arch/mips/isa/formats/mem.isa

// -*- mode:c++ -*-

// Copyright (c) 2003-2005 The Regents of The University of Michigan
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are
// met: redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer;
// redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution;
// neither the name of the copyright holders nor the names of its
// contributors may be used to endorse or promote products derived from
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//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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output header {{
    /**
     * Base class for general Mips memory-format instructions.
     */
    class Memory : public MipsStaticInst
    {
      protected:

        /// Memory request flags.  See mem_req_base.hh.
        unsigned memAccessFlags;
        /// Pointer to EAComp object.
        const StaticInstPtr eaCompPtr;
        /// Pointer to MemAcc object.
        const StaticInstPtr memAccPtr;

        /// Displacement for EA calculation (signed).
        int32_t disp;

        /// Constructor
        Memory(const char *mnem, MachInst _machInst, OpClass __opClass,
               StaticInstPtr _eaCompPtr = nullStaticInstPtr,
               StaticInstPtr _memAccPtr = nullStaticInstPtr)
            : MipsStaticInst(mnem, _machInst, __opClass),
              memAccessFlags(0), eaCompPtr(_eaCompPtr), memAccPtr(_memAccPtr),
              disp(OFFSET)
        {
            //If Bit 15 is 1 then Sign Extend
            int32_t temp = disp & 0x00008000;

            if (temp > 0) {
                disp |= 0xFFFF0000;
            }
        }

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

      public:

        const StaticInstPtr &eaCompInst() const { return eaCompPtr; }
        const StaticInstPtr &memAccInst() const { return memAccPtr; }
    };

}};


output decoder {{
    std::string
    Memory::generateDisassembly(Addr pc, const SymbolTable *symtab) const
    {
        return csprintf("%-10s %c%d,%d(r%d)", mnemonic,
                        flags[IsFloating] ? 'f' : 'r', RT, disp, RS);
    }

}};

def format LoadAddress(code) {{
    iop = InstObjParams(name, Name, 'MemoryDisp32', CodeBlock(code))
    header_output = BasicDeclare.subst(iop)
    decoder_output = BasicConstructor.subst(iop)
    decode_block = BasicDecode.subst(iop)
    exec_output = BasicExecute.subst(iop)
}};


def template LoadStoreDeclare {{
    /**
     * Static instruction class for "%(mnemonic)s".
     */
    class %(class_name)s : public %(base_class)s
    {
      protected:

        /**
         * "Fake" effective address computation class for "%(mnemonic)s".
         */
        class EAComp : public %(base_class)s
        {
          public:
            /// Constructor
            EAComp(MachInst machInst);

            %(BasicExecDeclare)s
        };

        /**
         * "Fake" memory access instruction class for "%(mnemonic)s".
         */
        class MemAcc : public %(base_class)s
        {
          public:
            /// Constructor
            MemAcc(MachInst machInst);

            %(BasicExecDeclare)s
        };

      public:

        /// Constructor.
        %(class_name)s(MachInst machInst);

        %(BasicExecDeclare)s

        %(InitiateAccDeclare)s

        %(CompleteAccDeclare)s
    };
}};


def template InitiateAccDeclare {{
    Fault initiateAcc(%(CPU_exec_context)s *, Trace::InstRecord *) const;
}};


def template CompleteAccDeclare {{
    Fault completeAcc(uint8_t *, %(CPU_exec_context)s *, Trace::InstRecord *) const;
}};


def template LoadStoreConstructor {{
    /** TODO: change op_class to AddrGenOp or something (requires
     * creating new member of OpClass enum in op_class.hh, updating
     * config files, etc.). */
    inline %(class_name)s::EAComp::EAComp(MachInst machInst)
        : %(base_class)s("%(mnemonic)s (EAComp)", machInst, IntAluOp)
    {
        %(ea_constructor)s;
    }

    inline %(class_name)s::MemAcc::MemAcc(MachInst machInst)
        : %(base_class)s("%(mnemonic)s (MemAcc)", machInst, %(op_class)s)
    {
        %(memacc_constructor)s;
    }

    inline %(class_name)s::%(class_name)s(MachInst machInst)
         : %(base_class)s("%(mnemonic)s", machInst, %(op_class)s,
                          new EAComp(machInst), new MemAcc(machInst))
    {
        %(constructor)s;
    }
}};


def template EACompExecute {{
    Fault
    %(class_name)s::EAComp::execute(%(CPU_exec_context)s *xc,
                                   Trace::InstRecord *traceData) const
    {
        Addr EA;
        Fault fault = NoFault;

        %(fp_enable_check)s;
        %(op_decl)s;
        %(op_rd)s;
        %(code)s;

        if (fault == NoFault) {
            %(op_wb)s;
            xc->setEA(EA);
        }

        return fault;
    }
}};

def template LoadMemAccExecute {{
    Fault
    %(class_name)s::MemAcc::execute(%(CPU_exec_context)s *xc,
                                   Trace::InstRecord *traceData) const
    {
        Fault fault = NoFault;
        //Fill in Code for Out-of-Order CPUs
        return fault;
    }
}};


def template LoadExecute {{
    Fault %(class_name)s::execute(%(CPU_exec_context)s *xc,
                                  Trace::InstRecord *traceData) const
    {
        Addr EA;
        Fault fault = NoFault;

        %(fp_enable_check)s;
        %(op_decl)s;
        %(op_rd)s;
        %(ea_code)s;

        if (fault == NoFault) {
            fault = xc->read(EA, (uint%(mem_acc_size)d_t&)Mem, memAccessFlags);
            %(memacc_code)s;
        }

        if (fault == NoFault) {
            %(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;
        //Fill in Code for Out-of-Order CPUs
        return fault;
    }
}};


def template LoadCompleteAcc {{
    Fault %(class_name)s::completeAcc(uint8_t *data,
                                      %(CPU_exec_context)s *xc,
                                      Trace::InstRecord *traceData) const
    {
        Fault fault = NoFault;
        //Fill in Code for Out-of-Order CPUs
        return fault;
    }
}};


def template StoreMemAccExecute {{
    Fault
    %(class_name)s::MemAcc::execute(%(CPU_exec_context)s *xc,
                                   Trace::InstRecord *traceData) const
    {
        Fault fault = NoFault;
        //Fill in Code for Out-of-Order CPUs
        return fault;
    }
}};


def template StoreExecute {{
    Fault %(class_name)s::execute(%(CPU_exec_context)s *xc,
                                  Trace::InstRecord *traceData) const
    {
        Addr EA;
        Fault fault = NoFault;
        uint64_t write_result = 0;

        %(fp_enable_check)s;
        %(op_decl)s;
        %(op_rd)s;
        %(ea_code)s;

        if (fault == NoFault) {
            %(memacc_code)s;
        }

        if (fault == NoFault) {
            fault = xc->write((uint%(mem_acc_size)d_t&)Mem, EA,
                              memAccessFlags, &write_result);
            if (traceData) { traceData->setData(Mem); }
        }

        if (fault == NoFault) {
            %(postacc_code)s;
        }

        if (fault == NoFault) {
            %(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;
        //Fill in Code for Out-of-Order CPUs
        return fault;
    }
}};


def template StoreCompleteAcc {{
    Fault %(class_name)s::completeAcc(uint8_t *data,
                                      %(CPU_exec_context)s *xc,
                                      Trace::InstRecord *traceData) const
    {
        Fault fault = NoFault;
        //Fill in Code for Out-of-Order CPUs
        return fault;
    }
}};

// load instructions use Rt as dest, so check for
// Rt == 31 to detect nops
def template LoadNopCheckDecode {{
 {
     MipsStaticInst *i = new %(class_name)s(machInst);
     if (RT == 0) {
         i = makeNop(i);
     }
     return i;
 }
}};

def format LoadMemory(memacc_code, ea_code = {{ EA = Rs + disp; }},
                     mem_flags = [], inst_flags = []) {{
    (header_output, decoder_output, decode_block, exec_output) = \
        LoadStoreBase(name, Name, ea_code, memacc_code, mem_flags, inst_flags,
                      decode_template = LoadNopCheckDecode,
                      exec_template_base = 'Load')
}};


def format StoreMemory(memacc_code, ea_code = {{ EA = Rs + disp; }},
                     mem_flags = [], inst_flags = []) {{
    (header_output, decoder_output, decode_block, exec_output) = \
        LoadStoreBase(name, Name, ea_code, memacc_code, mem_flags, inst_flags,
                      exec_template_base = 'Store')
}};

def format UnalignedStore(memacc_code, postacc_code,
                     ea_code = {{ EA = Rb + disp; }},
                     mem_flags = [], inst_flags = []) {{
    (header_output, decoder_output, decode_block, exec_output) = \
        LoadStoreBase(name, Name, ea_code, memacc_code, mem_flags, inst_flags,
                      postacc_code, exec_template_base = 'Store')
}};

//FP loads are offloaded to these formats for now ...
def format LoadMemory2(ea_code = {{ EA = Rs + disp; }}, memacc_code = {{ }},
                      mem_flags = [], inst_flags = []) {{
    (header_output, decoder_output, decode_block, exec_output) = \
        LoadStoreBase(name, Name, ea_code, memacc_code, mem_flags, inst_flags,
                      decode_template = LoadNopCheckDecode,
                      exec_template_base = 'Load')
}};


//FP stores are offloaded to these formats for now ...
def format StoreMemory2(ea_code = {{ EA = Rs + disp; }},memacc_code = {{ }},
                      mem_flags = [], inst_flags = []) {{
    (header_output, decoder_output, decode_block, exec_output) = \
        LoadStoreBase(name, Name, ea_code, memacc_code, mem_flags, inst_flags,
                      decode_template = LoadNopCheckDecode,
                      exec_template_base = 'Store')
}};