formats/mem/util.isa

// Copyright (c) 2006-2007 The Regents of The University of Michigan
// 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: Ali Saidi
//          Gabe Black
//          Steve Reinhardt

////////////////////////////////////////////////////////////////////
//
// Mem utility templates and functions
//

output header {{
        /**
         * Base class for memory operations.
         */
        class Mem : public SparcStaticInst
        {
          protected:

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

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

        /**
         * Class for memory operations which use an immediate offset.
         */
        class MemImm : public Mem
        {
          protected:

            // Constructor
            MemImm(const char *mnem, ExtMachInst _machInst, OpClass __opClass) :
                Mem(mnem, _machInst, __opClass), imm(sext<13>(SIMM13))
            {}

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

            const int32_t imm;
        };
}};

output decoder {{
        std::string Mem::generateDisassembly(Addr pc,
                const SymbolTable *symtab) const
        {
            std::stringstream response;
            bool load = flags[IsLoad];
            bool store = flags[IsStore];

            printMnemonic(response, mnemonic);
            if(store)
            {
                printReg(response, _srcRegIdx[0]);
                ccprintf(response, ", ");
            }
            ccprintf(response, "[");
            if(_srcRegIdx[!store ? 0 : 1] != 0)
            {
                printSrcReg(response, !store ? 0 : 1);
                ccprintf(response, " + ");
            }
            printSrcReg(response, !store ? 1 : 2);
            ccprintf(response, "]");
            if(load)
            {
                ccprintf(response, ", ");
                printReg(response, _destRegIdx[0]);
            }

            return response.str();
        }

        std::string MemImm::generateDisassembly(Addr pc,
                const SymbolTable *symtab) const
        {
            std::stringstream response;
            bool load = flags[IsLoad];
            bool save = flags[IsStore];

            printMnemonic(response, mnemonic);
            if(save)
            {
                printReg(response, _srcRegIdx[0]);
                ccprintf(response, ", ");
            }
            ccprintf(response, "[");
            if(_srcRegIdx[!save ? 0 : 1] != 0)
            {
                printReg(response, _srcRegIdx[!save ? 0 : 1]);
                ccprintf(response, " + ");
            }
            if(imm >= 0)
                ccprintf(response, "0x%x]", imm);
            else
                ccprintf(response, "-0x%x]", -imm);
            if(load)
            {
                ccprintf(response, ", ");
                printReg(response, _destRegIdx[0]);
            }

            return response.str();
        }
}};

//This template provides the execute functions for a load
def template LoadExecute {{
        Fault %(class_name)s::execute(%(CPU_exec_context)s *xc,
                Trace::InstRecord *traceData) const
        {
            Fault fault = NoFault;
            Addr EA;
            %(fp_enable_check)s;
            %(op_decl)s;
            %(op_rd)s;
            %(ea_code)s;
            DPRINTF(Sparc, "The address is 0x%x\n", EA);
            %(fault_check)s;
            if(fault == NoFault)
            {
                fault = xc->read(EA, (uint%(mem_acc_size)s_t&)Mem, %(asi_val)s);
            }
            if(fault == NoFault)
            {
                %(code)s;
            }
            if(fault == NoFault)
            {
                    //Write the resulting state to the execution context
                    %(op_wb)s;
            }

            return fault;
        }

        Fault %(class_name)s::initiateAcc(%(CPU_exec_context)s * xc,
                Trace::InstRecord * traceData) const
        {
            Fault fault = NoFault;
            Addr EA;
            uint%(mem_acc_size)s_t Mem;
            %(fp_enable_check)s;
            %(ea_decl)s;
            %(ea_rd)s;
            %(ea_code)s;
            %(fault_check)s;
            if(fault == NoFault)
            {
                fault = xc->read(EA, (uint%(mem_acc_size)s_t&)Mem, %(asi_val)s);
            }
            return fault;
        }

        Fault %(class_name)s::completeAcc(PacketPtr pkt, %(CPU_exec_context)s * xc,
                Trace::InstRecord * traceData) const
        {
            Fault fault = NoFault;
            %(code_decl)s;
            %(code_rd)s;
            Mem = pkt->get<typeof(Mem)>();
            %(code)s;
            if(fault == NoFault)
            {
                %(code_wb)s;
            }
            return fault;
        }
}};

//This template provides the execute functions for a store
def template StoreExecute {{
        Fault %(class_name)s::execute(%(CPU_exec_context)s *xc,
                Trace::InstRecord *traceData) const
        {
            Fault fault = NoFault;
            //This is to support the conditional store in cas instructions.
            //It should be optomized out in all the others
            bool storeCond = true;
            Addr EA;
            %(fp_enable_check)s;
            %(op_decl)s;
            %(op_rd)s;
            %(ea_code)s;
            DPRINTF(Sparc, "The address is 0x%x\n", EA);
            %(fault_check)s;
            if(fault == NoFault)
            {
                %(code)s;
            }
            if(storeCond && fault == NoFault)
            {
                fault = xc->write((uint%(mem_acc_size)s_t)Mem,
                        EA, %(asi_val)s, 0);
            }
            if(fault == NoFault)
            {
                    //Write the resulting state to the execution context
                    %(op_wb)s;
            }

            return fault;
        }

        Fault %(class_name)s::initiateAcc(%(CPU_exec_context)s * xc,
                Trace::InstRecord * traceData) const
        {
            Fault fault = NoFault;
            bool storeCond = true;
            Addr EA;
            %(fp_enable_check)s;
            %(op_decl)s;
            %(op_rd)s;
            %(ea_code)s;
            DPRINTF(Sparc, "The address is 0x%x\n", EA);
            %(fault_check)s;
            if(fault == NoFault)
            {
                %(code)s;
            }
            if(storeCond && fault == NoFault)
            {
                fault = xc->write((uint%(mem_acc_size)s_t)Mem,
                        EA, %(asi_val)s, 0);
            }
            if(fault == NoFault)
            {
                    //Write the resulting state to the execution context
                %(op_wb)s;
            }
            return fault;
        }

        Fault %(class_name)s::completeAcc(PacketPtr, %(CPU_exec_context)s * xc,
                Trace::InstRecord * traceData) const
        {
            return NoFault;
        }
}};

//This delcares the initiateAcc function in memory operations
def template InitiateAccDeclare {{
    Fault initiateAcc(%(CPU_exec_context)s *, Trace::InstRecord *) const;
}};

//This declares the completeAcc function in memory operations
def template CompleteAccDeclare {{
    Fault completeAcc(PacketPtr, %(CPU_exec_context)s *, Trace::InstRecord *) const;
}};

//Here are some code snippets which check for various fault conditions
let {{
    # The LSB can be zero, since it's really the MSB in doubles and quads
    # and we're dealing with doubles
    BlockAlignmentFaultCheck = '''
        if(RD & 0xe)
            fault = new IllegalInstruction;
        else if(EA & 0x3f)
            fault = new MemAddressNotAligned;
    '''
    TwinAlignmentFaultCheck = '''
        if(RD & 0x1)
            fault = new IllegalInstruction;
        else if(EA & 0xf)
            fault = new MemAddressNotAligned;
    '''
    # XXX Need to take care of pstate.hpriv as well. The lower ASIs
    # are split into ones that are available in priv and hpriv, and
    # those that are only available in hpriv
    AlternateASIPrivFaultCheck = '''
        if(!bits(Pstate,2,2) && !bits(Hpstate,2,2) && !AsiIsUnPriv((ASI)EXT_ASI) ||
                             !bits(Hpstate,2,2) && AsiIsHPriv((ASI)EXT_ASI))
                fault = new PrivilegedAction;
        else if(AsiIsAsIfUser((ASI)EXT_ASI) && !bits(Pstate,2,2))
            fault = new PrivilegedAction;
    '''

}};

//A simple function to generate the name of the macro op of a certain
//instruction at a certain micropc
let {{
    def makeMicroName(name, microPc):
            return name + "::" + name + "_" + str(microPc)
}};

//This function properly generates the execute functions for one of the
//templates above. This is needed because in one case, ea computation,
//fault checks and the actual code all occur in the same function,
//and in the other they're distributed across two. Also note that for
//execute functions, the name of the base class doesn't matter.
let {{
    def doSplitExecute(code, execute, name, Name, asi, opt_flags, microParam):
        microParam["asi_val"] = asi;
        codeParam = microParam.copy()
        codeParam["ea_code"] = ''
        codeIop = InstObjParams(name, Name, '', code, opt_flags, codeParam)
        eaIop = InstObjParams(name, Name, '', microParam["ea_code"],
                opt_flags, microParam)
        iop = InstObjParams(name, Name, '', code, opt_flags, microParam)
        (iop.ea_decl,
         iop.ea_rd,
         iop.ea_wb) = (eaIop.op_decl, eaIop.op_rd, eaIop.op_wb)
        (iop.code_decl,
         iop.code_rd,
         iop.code_wb) = (codeIop.op_decl, codeIop.op_rd, codeIop.op_wb)
        return execute.subst(iop)


    def doDualSplitExecute(code, eaRegCode, eaImmCode, execute,
            faultCode, nameReg, nameImm, NameReg, NameImm, asi, opt_flags):
        executeCode = ''
        for (eaCode, name, Name) in (
                (eaRegCode, nameReg, NameReg),
                (eaImmCode, nameImm, NameImm)):
            microParams = {"ea_code" : eaCode, "fault_check": faultCode}
            executeCode += doSplitExecute(code, execute, name, Name,
                    asi, opt_flags, microParams)
        return executeCode
}};