xref: /gem5/src/arch/x86/isa/microops/seqop.isa

// Copyright (c) 2008 The Hewlett-Packard Development Company
// All rights reserved.
//
// The license below extends only to copyright in the software and shall
// not be construed as granting a license to any other intellectual
// property including but not limited to intellectual property relating
// to a hardware implementation of the functionality of the software
// licensed hereunder.  You may use the software subject to the license
// terms below provided that you ensure that this notice is replicated
// unmodified and in its entirety in all distributions of the software,
// modified or unmodified, in source code or in binary form.
//
// 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
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// 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
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//
// Authors: Gabe Black

output header {{
    class SeqOpBase : public X86ISA::X86MicroopBase
    {
      protected:
        uint16_t target;
        uint8_t cc;

      public:
        SeqOpBase(ExtMachInst _machInst, const char * instMnem,
                const char * mnemonic, uint64_t setFlags,
                uint16_t _target, uint8_t _cc);

        SeqOpBase(ExtMachInst _machInst, const char * instMnem,
                const char * mnemonic,
                uint16_t _target, uint8_t _cc);

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

def template SeqOpDeclare {{
    class %(class_name)s : public %(base_class)s
    {
      public:
        %(class_name)s(ExtMachInst _machInst, const char * instMnem,
                uint64_t setFlags, uint16_t _target, uint8_t _cc);

        Fault execute(ExecContext *, Trace::InstRecord *) const;
    };
}};

def template SeqOpExecute {{
        Fault %(class_name)s::execute(ExecContext *xc,
                Trace::InstRecord *traceData) const
        {
            %(op_decl)s;
            %(op_rd)s;
            if (%(cond_test)s) {
                %(code)s;
            } else {
                %(else_code)s;
            }
            %(op_wb)s;
            return NoFault;
        }
}};

output decoder {{
    SeqOpBase::SeqOpBase(
            ExtMachInst machInst, const char * mnemonic, const char * instMnem,
            uint64_t setFlags, uint16_t _target, uint8_t _cc) :
        X86MicroopBase(machInst, mnemonic, instMnem, setFlags, No_OpClass),
                target(_target), cc(_cc)
    {
    }
}};

def template SeqOpConstructor {{
    %(class_name)s::%(class_name)s(
            ExtMachInst machInst, const char * instMnem,
            uint64_t setFlags, uint16_t _target, uint8_t _cc) :
        %(base_class)s(machInst, "%(mnemonic)s", instMnem,
                setFlags, _target, _cc)
    {
        %(constructor)s;
        %(cond_control_flag_init)s;
    }
}};

output decoder {{
    std::string SeqOpBase::generateDisassembly(Addr pc,
            const SymbolTable *symtab) const
    {
        std::stringstream response;

        printMnemonic(response, instMnem, mnemonic);
        ccprintf(response, "%#x", target);

        return response.str();
    }
}};

let {{
    class SeqOp(X86Microop):
        def __init__(self, target, flags=None):
            self.target = target
            if flags:
                if not isinstance(flags, (list, tuple)):
                    raise Exception, "flags must be a list or tuple of flags"
                self.cond = " | ".join(flags)
                self.className += "Flags"
            else:
                self.cond = "0"

        def getAllocator(self, microFlags):
            allocator = '''new %(class_name)s(machInst, macrocodeBlock,
                    %(flags)s, %(target)s, %(cc)s)''' % {
                "class_name" : self.className,
                "flags" : self.microFlagsText(microFlags),
                "target" : self.target,
                "cc" : self.cond}
            return allocator

    class Br(SeqOp):
        className = "MicroBranch"

        def getAllocator(self, microFlags):
            if "IsLastMicroop" in microFlags:
                microFlags.remove("IsLastMicroop")
            if not "IsDelayedCommit" in microFlags:
                microFlags.append("IsDelayedCommit")
            return super(Br, self).getAllocator(microFlags)

    class Eret(SeqOp):
        target = "normalMicroPC(0)"
        className = "Eret"

        def __init__(self, flags=None):
            if flags:
                if not isinstance(flags, (list, tuple)):
                    raise Exception, "flags must be a list or tuple of flags"
                self.cond = " | ".join(flags)
                self.className += "Flags"
            else:
                self.cond = "0"

        def getAllocator(self, microFlags):
            if not "IsLastMicroop" in microFlags:
                microFlags.append("IsLastMicroop")
            if "IsDelayedCommit" in microFlags:
                microFlags.remove("IsDelayedCommit")
            return super(Eret, self).getAllocator(microFlags)

    iop = InstObjParams("br", "MicroBranchFlags", "SeqOpBase",
            {"code": "nuIP = target;",
             "else_code": "nuIP = nuIP;",
             "cond_test": "checkCondition(ccFlagBits | cfofBits | dfBit | \
                                          ecfBit | ezfBit, cc)",
             "cond_control_flag_init": "flags[IsCondControl] = true"})
    exec_output += SeqOpExecute.subst(iop)
    header_output += SeqOpDeclare.subst(iop)
    decoder_output += SeqOpConstructor.subst(iop)
    iop = InstObjParams("br", "MicroBranch", "SeqOpBase",
            {"code": "nuIP = target;",
             "else_code": "nuIP = nuIP;",
             "cond_test": "true",
             "cond_control_flag_init": ""})
    exec_output += SeqOpExecute.subst(iop)
    header_output += SeqOpDeclare.subst(iop)
    decoder_output += SeqOpConstructor.subst(iop)
    microopClasses["br"] = Br

    iop = InstObjParams("eret", "EretFlags", "SeqOpBase",
            {"code": "", "else_code": "",
             "cond_test": "checkCondition(ccFlagBits | cfofBits | dfBit | \
                                          ecfBit | ezfBit, cc)",
             "cond_control_flag_init": ""})
    exec_output += SeqOpExecute.subst(iop)
    header_output += SeqOpDeclare.subst(iop)
    decoder_output += SeqOpConstructor.subst(iop)
    iop = InstObjParams("eret", "Eret", "SeqOpBase",
            {"code": "", "else_code": "",
             "cond_test": "true",
             "cond_control_flag_init": ""})
    exec_output += SeqOpExecute.subst(iop)
    header_output += SeqOpDeclare.subst(iop)
    decoder_output += SeqOpConstructor.subst(iop)
    microopClasses["eret"] = Eret
}};