src/arch/mips/isa/formats/trap.isa

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

// Copyright (c) 2007 MIPS Technologies, Inc.
// 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.

////////////////////////////////////////////////////////////////////
//
// Trap instructions
//

output header {{
    /**
     * Base class for integer operations.
     */
    class Trap : public MipsStaticInst
    {
      protected:
        using MipsStaticInst::MipsStaticInst;

        std::string generateDisassembly(
                Addr pc, const Loader::SymbolTable *symtab) const override;
    };
    class TrapImm : public MipsStaticInst
    {
      protected:
        int16_t imm;

        TrapImm(const char *mnem, MachInst _machInst, OpClass __opClass) :
            MipsStaticInst(mnem, _machInst, __opClass), imm(INTIMM)
        {}

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

output decoder {{
    std::string
    Trap::generateDisassembly(
            Addr pc, const Loader::SymbolTable *symtab) const
    {
        return "Disassembly of trap instruction\n";
    }
    std::string
    TrapImm::generateDisassembly(
            Addr pc, const Loader::SymbolTable *symtab) const
    {
        return "Disassembly of trap instruction\n";
    }
}};

def template TrapExecute {{
    // Edit This Template When Traps Are Implemented
    Fault %(class_name)s::execute(
        ExecContext *xc, Trace::InstRecord *traceData) const
    {
        //Write the resulting state to the execution context
        %(op_wb)s;

        //Call into the trap handler with the appropriate fault
        return No_Fault;
    }
}};
def format Trap(code, *flags) {{
    code ='bool cond;\n' + code
    code += 'if (cond) {\n'
    code += 'fault = std::make_shared<TrapFault>();\n};'

    iop = InstObjParams(name, Name, 'MipsStaticInst', code, flags)
    header_output = BasicDeclare.subst(iop)
    decoder_output = BasicConstructor.subst(iop)
    decode_block = BasicDecode.subst(iop)
    exec_output = BasicExecute.subst(iop)
}};
def format TrapImm(code, *flags) {{
    code ='bool cond;\n' + code
    code += 'if (cond) {\n'
    code += 'fault = std::make_shared<TrapFault>();\n};'
    iop = InstObjParams(name, Name, 'MipsStaticInst', code, flags)
    header_output = BasicDeclare.subst(iop)
    decoder_output = BasicConstructor.subst(iop)
    decode_block = BasicDecode.subst(iop)
    exec_output = BasicExecute.subst(iop)
}};