standard.hh

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/*
 * Copyright (c) 2015 RISC-V Foundation
 * Copyright (c) 2017 The University of Virginia
 * Copyright (c) 2020 Barkhausen Institut
 * 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.
 */
 
#ifndef __ARCH_RISCV_STANDARD_INST_HH__
#define __ARCH_RISCV_STANDARD_INST_HH__
 
#include <string>
 
#include "arch/riscv/insts/static_inst.hh"
#include "arch/riscv/regs/misc.hh"
#include "cpu/exec_context.hh"
#include "cpu/static_inst.hh"
 
namespace gem5
{
 
namespace RiscvISA
{

class RegOp : public RiscvStaticInst
{
  protected:
    using RiscvStaticInst::RiscvStaticInst;
 
    std::string generateDisassembly(
        Addr pc, const loader::SymbolTable *symtab) const override;
};

template<typename I>
class ImmOp : public RiscvStaticInst
{
  protected:
    I imm;
 
    ImmOp(const char *mnem, ExtMachInst _machInst, OpClass __opClass)
        : RiscvStaticInst(mnem, _machInst, __opClass), imm(0)
    {}
};

class SystemOp : public RiscvStaticInst
{
  protected:
    using RiscvStaticInst::RiscvStaticInst;
 
    std::string generateDisassembly(
        Addr pc, const loader::SymbolTable *symtab) const override;
 
  protected:
    Fault executeEBreakOrSemihosting(ExecContext *xc) const;
};

class CSROp : public RiscvStaticInst
{
  protected:
    uint64_t csr;
    uint64_t uimm;

    CSROp(const char *mnem, ExtMachInst _machInst, OpClass __opClass)
        : RiscvStaticInst(mnem, _machInst, __opClass),
          csr(_machInst.funct12), uimm(_machInst.csrimm)
    {
        if (csr == CSR_SATP) {
            flags[IsSquashAfter] = true;
        }
    }
 
    std::string generateDisassembly(
        Addr pc, const loader::SymbolTable *symtab) const override;
};
 
} // namespace RiscvISA
} // namespace gem5
 
#endif // __ARCH_RISCV_STANDARD_INST_HH__