xref: /gem5/src/arch/riscv/isa/formats/amo.isa

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

// Copyright (c) 2015 Riscv Developers
// Copyright (c) 2016 The University of Virginia
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// 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
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Authors: Alec Roelke

////////////////////////////////////////////////////////////////////
//
// Atomic memory operation instructions
//
output header {{
    class LoadReserved : public RiscvStaticInst
    {
      protected:
        Request::Flags memAccessFlags;

        LoadReserved(const char *mnem, ExtMachInst _machInst,
            OpClass __opClass)
                : RiscvStaticInst(mnem, _machInst, __opClass)
        {}

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

    class StoreCond : public RiscvStaticInst
    {
      protected:
        Request::Flags memAccessFlags;

        StoreCond(const char* mnem, ExtMachInst _machInst, OpClass __opClass)
                : RiscvStaticInst(mnem, _machInst, __opClass)
        {}

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

    class AtomicMemOp : public RiscvMacroInst
    {
    protected:
        /// Constructor
        // Each AtomicMemOp has a load and a store phase
        AtomicMemOp(const char *mnem, ExtMachInst _machInst, OpClass __opClass)
                : RiscvMacroInst(mnem, _machInst, __opClass)
        {}

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

    class AtomicMemOpMicro : public RiscvMicroInst
    {
    protected:
        /// Memory request flags.  See mem/request.hh.
        Request::Flags memAccessFlags;

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

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

output decoder {{
    std::string LoadReserved::generateDisassembly(Addr pc,
        const SymbolTable *symtab) const
    {
        std::stringstream ss;
        ss << mnemonic << ' ' << registerName(_destRegIdx[0]) << ", ("
                << registerName(_srcRegIdx[0]) << ')';
        return ss.str();
    }

    std::string StoreCond::generateDisassembly(Addr pc,
        const SymbolTable *symtab) const
    {
        std::stringstream ss;
        ss << mnemonic << ' ' << registerName(_destRegIdx[0]) << ", "
                << registerName(_srcRegIdx[1]) << ", ("
                << registerName(_srcRegIdx[0]) << ')';
        return ss.str();
    }

    std::string AtomicMemOp::generateDisassembly(Addr pc,
        const SymbolTable *symtab) const
    {
        std::stringstream ss;
        ss << mnemonic << ' ' << registerName(_destRegIdx[0]) << ", "
                << registerName(_srcRegIdx[1]) << ", ("
                << registerName(_srcRegIdx[0]) << ')';
        return ss.str();
    }

    std::string AtomicMemOpMicro::generateDisassembly(Addr pc,
        const SymbolTable *symtab) const
    {
        std::stringstream ss;
        ss << csprintf("0x%08x", machInst) << ' ' << mnemonic;
        return ss.str();
    }
}};

def template AtomicMemOpDeclare {{
    /**
     * Static instruction class for an AtomicMemOp operation
     */
    class %(class_name)s : public %(base_class)s
    {
      public:
        // Constructor
        %(class_name)s(ExtMachInst machInst);

    protected:

        class %(class_name)sLoad : public %(base_class)sMicro
        {
          public:
            // Constructor
            %(class_name)sLoad(ExtMachInst machInst, %(class_name)s *_p);

            %(BasicExecDeclare)s

            %(EACompDeclare)s

            %(InitiateAccDeclare)s

            %(CompleteAccDeclare)s
        };

        class %(class_name)sStore : public %(base_class)sMicro
        {
          public:
            // Constructor
            %(class_name)sStore(ExtMachInst machInst, %(class_name)s *_p);

            %(BasicExecDeclare)s

            %(EACompDeclare)s

            %(InitiateAccDeclare)s

            %(CompleteAccDeclare)s
        };
    };
}};

def template LRSCConstructor {{
    %(class_name)s::%(class_name)s(ExtMachInst machInst):
        %(base_class)s("%(mnemonic)s", machInst, %(op_class)s)
    {
        %(constructor)s;
        if (AQ)
            memAccessFlags = memAccessFlags | Request::ACQUIRE;
        if (RL)
            memAccessFlags = memAccessFlags | Request::RELEASE;
    }
}};

def template AtomicMemOpMacroConstructor {{
    %(class_name)s::%(class_name)s(ExtMachInst machInst)
            : %(base_class)s("%(mnemonic)s", machInst, %(op_class)s)
    {
        %(constructor)s;
        microops = {new %(class_name)sLoad(machInst, this),
            new %(class_name)sStore(machInst, this)};
    }
}};

def template AtomicMemOpLoadConstructor {{
    %(class_name)s::%(class_name)sLoad::%(class_name)sLoad(
        ExtMachInst machInst, %(class_name)s *_p)
            : %(base_class)s("%(mnemonic)s[l]", machInst, %(op_class)s)
    {
        %(constructor)s;
        flags[IsFirstMicroop] = true;
        flags[IsDelayedCommit] = true;
        if (AQ)
            memAccessFlags = Request::ACQUIRE;
    }
}};

def template AtomicMemOpStoreConstructor {{
    %(class_name)s::%(class_name)sStore::%(class_name)sStore(
        ExtMachInst machInst, %(class_name)s *_p)
            : %(base_class)s("%(mnemonic)s[s]", machInst, %(op_class)s)
    {
        %(constructor)s;
        flags[IsLastMicroop] = true;
        flags[IsNonSpeculative] = true;
        if (RL)
            memAccessFlags = Request::RELEASE;
    }
}};

def template StoreCondExecute {{
    Fault %(class_name)s::execute(ExecContext *xc,
        Trace::InstRecord *traceData) const
    {
        Addr EA;
        Fault fault = NoFault;
        uint64_t result;

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

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

        if (fault == NoFault) {
            fault = writeMemAtomic(xc, traceData, Mem, EA, memAccessFlags,
                &result);
            // RISC-V has the opposite convention gem5 has for success flags,
            // so we invert the result here.
            result = !result;
        }

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

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

        return fault;
    }
}};

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

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

        if (fault == NoFault) {
            fault = readMemAtomic(xc, traceData, EA, Mem, memAccessFlags);
        }

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

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

        return fault;
    }
}};

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

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

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

        if (fault == NoFault) {
            fault = writeMemAtomic(xc, traceData, Mem, EA, memAccessFlags,
                nullptr);
        }

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

        return fault;
    }
}};

def template AtomicMemOpEACompExecute {{
    Fault
    %(class_name)s::%(class_name)s%(op_name)s::eaComp(ExecContext *xc,
        Trace::InstRecord *traceData) const
    {
        Addr EA;
        Fault fault = NoFault;

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

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

        return fault;
    }
}};

def template AtomicMemOpLoadInitiateAcc {{
    Fault %(class_name)s::%(class_name)sLoad::initiateAcc(ExecContext *xc,
        Trace::InstRecord *traceData) const
    {
        Addr EA;
        Fault fault = NoFault;

        %(op_src_decl)s;
        %(op_rd)s;
        %(ea_code)s;

        if (fault == NoFault) {
            fault = initiateMemRead(xc, traceData, EA, Mem, memAccessFlags);
        }

        return fault;
    }
}};

def template AtomicMemOpStoreInitiateAcc {{
    Fault %(class_name)s::%(class_name)sStore::initiateAcc(
        ExecContext *xc, Trace::InstRecord *traceData) const
    {
        Addr EA;
        Fault fault = NoFault;

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

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

        if (fault == NoFault) {
            fault = writeMemTiming(xc, traceData, Mem, EA, memAccessFlags,
                nullptr);
        }

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

        return fault;
    }
}};

def template StoreCondCompleteAcc {{
    Fault %(class_name)s::completeAcc(Packet *pkt, ExecContext *xc,
        Trace::InstRecord *traceData) const
    {
        Fault fault = NoFault;

        %(op_dest_decl)s;

        // RISC-V has the opposite convention gem5 has for success flags,
        // so we invert the result here.
        uint64_t result = !pkt->req->getExtraData();

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

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

        return fault;
    }
}};

def template AtomicMemOpLoadCompleteAcc {{
    Fault %(class_name)s::%(class_name)sLoad::completeAcc(PacketPtr pkt,
        ExecContext *xc, Trace::InstRecord *traceData) const
    {
        Fault fault = NoFault;

        %(op_decl)s;
        %(op_rd)s;

        getMem(pkt, Mem, traceData);

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

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

        return fault;
    }
}};

def template AtomicMemOpStoreCompleteAcc {{
    Fault %(class_name)s::%(class_name)sStore::completeAcc(PacketPtr pkt,
        ExecContext *xc, Trace::InstRecord *traceData) const
    {
        return NoFault;
    }
}};

def format LoadReserved(memacc_code, postacc_code={{ }}, ea_code={{EA = Rs1;}},
        mem_flags=[], inst_flags=[]) {{
    mem_flags = makeList(mem_flags)
    inst_flags = makeList(inst_flags)
    iop = InstObjParams(name, Name, 'LoadReserved',
        {'ea_code': ea_code, 'memacc_code': memacc_code,
        'postacc_code': postacc_code}, inst_flags)
    iop.constructor += '\n\tmemAccessFlags = memAccessFlags | ' + \
        '|'.join(['Request::%s' % flag for flag in mem_flags]) + ';'

    header_output = LoadStoreDeclare.subst(iop)
    decoder_output = LRSCConstructor.subst(iop)
    decode_block = BasicDecode.subst(iop)
    exec_output = LoadExecute.subst(iop) \
        + EACompExecute.subst(iop) \
        + LoadInitiateAcc.subst(iop) \
        + LoadCompleteAcc.subst(iop)
}};

def format StoreCond(memacc_code, postacc_code={{ }}, ea_code={{EA = Rs1;}},
        mem_flags=[], inst_flags=[]) {{
    mem_flags = makeList(mem_flags)
    inst_flags = makeList(inst_flags)
    iop = InstObjParams(name, Name, 'StoreCond',
        {'ea_code': ea_code, 'memacc_code': memacc_code,
        'postacc_code': postacc_code}, inst_flags)
    iop.constructor += '\n\tmemAccessFlags = memAccessFlags | ' + \
        '|'.join(['Request::%s' % flag for flag in mem_flags]) + ';'

    header_output = LoadStoreDeclare.subst(iop)
    decoder_output = LRSCConstructor.subst(iop)
    decode_block = BasicDecode.subst(iop)
    exec_output = StoreCondExecute.subst(iop) \
        + EACompExecute.subst(iop) \
        + StoreInitiateAcc.subst(iop) \
        + StoreCondCompleteAcc.subst(iop)
}};

def format AtomicMemOp(load_code, store_code, ea_code, load_flags=[],
        store_flags=[], inst_flags=[]) {{
    macro_iop = InstObjParams(name, Name, 'AtomicMemOp', ea_code, inst_flags)
    header_output = AtomicMemOpDeclare.subst(macro_iop)
    decoder_output = AtomicMemOpMacroConstructor.subst(macro_iop)
    decode_block = BasicDecode.subst(macro_iop)
    exec_output = ''

    load_inst_flags = makeList(inst_flags) + ["IsMemRef", "IsLoad"]
    load_iop = InstObjParams(name, Name, 'AtomicMemOpMicro',
        {'ea_code': ea_code, 'code': load_code, 'op_name': 'Load'},
        load_inst_flags)
    decoder_output += AtomicMemOpLoadConstructor.subst(load_iop)
    exec_output += AtomicMemOpLoadExecute.subst(load_iop) \
        + AtomicMemOpEACompExecute.subst(load_iop) \
        + AtomicMemOpLoadInitiateAcc.subst(load_iop) \
        + AtomicMemOpLoadCompleteAcc.subst(load_iop)

    store_inst_flags = makeList(inst_flags) + ["IsMemRef", "IsStore"]
    store_iop = InstObjParams(name, Name, 'AtomicMemOpMicro',
        {'ea_code': ea_code, 'code': store_code, 'op_name': 'Store'},
        store_inst_flags)
    decoder_output += AtomicMemOpStoreConstructor.subst(store_iop)
    exec_output += AtomicMemOpStoreExecute.subst(store_iop) \
        + AtomicMemOpEACompExecute.subst(store_iop) \
        + AtomicMemOpStoreInitiateAcc.subst(store_iop) \
        + AtomicMemOpStoreCompleteAcc.subst(store_iop)
}};