xref: /gem5/src/arch/arm/utility.hh

/*
 * Copyright (c) 2003-2005 The Regents of The University of Michigan
 * Copyright (c) 2007-2008 The Florida State University
 * 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: Korey Sewell
 *          Stephen Hines
 */

#ifndef __ARCH_ARM_UTILITY_HH__
#define __ARCH_ARM_UTILITY_HH__

#include "arch/arm/miscregs.hh"
#include "arch/arm/types.hh"
#include "base/misc.hh"
#include "base/types.hh"
#include "config/full_system.hh"
#include "cpu/thread_context.hh"

class ThreadContext;

namespace ArmISA {

    inline bool
    testPredicate(CPSR cpsr, ConditionCode code)
    {
        switch (code)
        {
            case COND_EQ: return  cpsr.z;
            case COND_NE: return !cpsr.z;
            case COND_CS: return  cpsr.c;
            case COND_CC: return !cpsr.c;
            case COND_MI: return  cpsr.n;
            case COND_PL: return !cpsr.n;
            case COND_VS: return  cpsr.v;
            case COND_VC: return !cpsr.v;
            case COND_HI: return  (cpsr.c && !cpsr.z);
            case COND_LS: return !(cpsr.c && !cpsr.z);
            case COND_GE: return !(cpsr.n ^ cpsr.v);
            case COND_LT: return  (cpsr.n ^ cpsr.v);
            case COND_GT: return !(cpsr.n ^ cpsr.v || cpsr.z);
            case COND_LE: return  (cpsr.n ^ cpsr.v || cpsr.z);
            case COND_AL: return true;
            case COND_NV: return false;
            default:
                panic("Unhandled predicate condition: %d\n", code);
        }
    }

    //Floating Point Utility Functions
    uint64_t fpConvert(ConvertType cvt_type, double fp_val);
    double roundFP(double val, int digits);
    double truncFP(double val);

    bool getCondCode(uint32_t fcsr, int cc);
    uint32_t genCCVector(uint32_t fcsr, int num, uint32_t cc_val);
    uint32_t genInvalidVector(uint32_t fcsr);

    bool isNan(void *val_ptr, int size);
    bool isQnan(void *val_ptr, int size);
    bool isSnan(void *val_ptr, int size);

    /**
     * Function to insure ISA semantics about 0 registers.
     * @param tc The thread context.
     */
    template <class TC>
    void zeroRegisters(TC *tc);

    // Instruction address compression hooks
    static inline Addr realPCToFetchPC(const Addr &addr) {
        return addr;
    }

    static inline Addr fetchPCToRealPC(const Addr &addr) {
        return addr;
    }

    // the size of "fetched" instructions
    static inline size_t fetchInstSize() {
        return sizeof(MachInst);
    }

    static inline MachInst makeRegisterCopy(int dest, int src) {
        panic("makeRegisterCopy not implemented");
        return 0;
    }

    inline void startupCPU(ThreadContext *tc, int cpuId)
    {
        tc->activate(0);
    }
};


#endif