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

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

// Copyright (c) 2015 RISC-V Foundation
// 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: Maxwell Walter
//          Alec Roelke

// Declarations for execute() methods.
def template BasicExecDeclare {{
    Fault execute(%(CPU_exec_context)s *, Trace::InstRecord *) const;
}};

// Basic instruction class declaration template.
def template BasicDeclare {{
    //
    // Static instruction class for "%(mnemonic)s".
    //
    class %(class_name)s : public %(base_class)s
    {
      public:
        /// Constructor.
        %(class_name)s(MachInst machInst);
        %(BasicExecDeclare)s
        using %(base_class)s::generateDisassembly;
    };
}};

// Basic instruction class constructor template.
def template BasicConstructor {{
    %(class_name)s::%(class_name)s(MachInst machInst)
        : %(base_class)s("%(mnemonic)s", machInst, %(op_class)s)
    {
        %(constructor)s;
    }
}};


// Basic instruction class execute method template.
def template BasicExecute {{
    Fault
    %(class_name)s::execute(CPU_EXEC_CONTEXT *xc,
        Trace::InstRecord *traceData) const
    {
        Fault fault = NoFault;

        %(op_decl)s;
        %(op_rd)s;
        if (fault == NoFault) {
            %(code)s;
            if (fault == NoFault) {
                %(op_wb)s;
            }
        }
        return fault;
    }
}};

// Basic decode template.
def template BasicDecode {{
    return new %(class_name)s(machInst);
}};

// Basic decode template, passing mnemonic in as string arg to constructor.
def template BasicDecodeWithMnemonic {{
    return new %(class_name)s("%(mnemonic)s", machInst);
}};

// The most basic instruction format...
def format BasicOp(code, *flags) {{
    iop = InstObjParams(name, Name, 'RiscvStaticInst', code, flags)
    header_output = BasicDeclare.subst(iop)
    decoder_output = BasicConstructor.subst(iop)
    decode_block = BasicDecode.subst(iop)
    exec_output = BasicExecute.subst(iop)
}};