src/arch/x86/insts/microop.cc

/*
 * Copyright (c) 2007 The Hewlett-Packard Development Company
 * All rights reserved.
 *
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 * property including but not limited to intellectual property relating
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 * licensed hereunder.  You may use the software subject to the license
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 * Redistribution and use in source and binary forms, with or without
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 * 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
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#include "arch/x86/insts/microop.hh"

#include "arch/x86/regs/misc.hh"

namespace gem5
{

namespace X86ISA
{

bool
X86MicroopBase::checkCondition(uint64_t flags, int condition) const
{
    CCFlagBits ccflags = flags;
    switch(condition)
    {
      case condition_tests::True:
        return true;
      case condition_tests::ECF:
        return ccflags.ecf;
      case condition_tests::EZF:
        return ccflags.ezf;
      case condition_tests::SZnZF:
        return !(!ccflags.ezf && ccflags.zf);
      case condition_tests::MSTRZ:
        panic("This condition is not implemented!");
      case condition_tests::STRZ:
        panic("This condition is not implemented!");
      case condition_tests::MSTRC:
        panic("This condition is not implemented!");
      case condition_tests::STRZnEZF:
        return !ccflags.ezf && ccflags.zf;
            //And no interrupts or debug traps are waiting
      case condition_tests::OF:
        return ccflags.of;
      case condition_tests::CF:
        return ccflags.cf;
      case condition_tests::ZF:
        return ccflags.zf;
      case condition_tests::CvZF:
        return ccflags.cf | ccflags.zf;
      case condition_tests::SF:
        return ccflags.sf;
      case condition_tests::PF:
        return ccflags.pf;
      case condition_tests::SxOF:
        return ccflags.sf ^ ccflags.of;
      case condition_tests::SxOvZF:
        return (ccflags.sf ^ ccflags.of) | ccflags.zf;
      case condition_tests::False:
        return false;
      case condition_tests::NotECF:
        return !ccflags.ecf;
      case condition_tests::NotEZF:
        return !ccflags.ezf;
      case condition_tests::NotSZnZF:
        return !ccflags.ezf && ccflags.zf;
      case condition_tests::NotMSTRZ:
        panic("This condition is not implemented!");
      case condition_tests::NotSTRZ:
        panic("This condition is not implemented!");
      case condition_tests::NotMSTRC:
        panic("This condition is not implemented!");
      case condition_tests::STRnZnEZF:
        return !ccflags.ezf && !ccflags.zf;
            //And no interrupts or debug traps are waiting
      case condition_tests::NotOF:
        return !ccflags.of;
      case condition_tests::NotCF:
        return !ccflags.cf;
      case condition_tests::NotZF:
        return !ccflags.zf;
      case condition_tests::NotCvZF:
        return !(ccflags.cf | ccflags.zf);
      case condition_tests::NotSF:
        return !ccflags.sf;
      case condition_tests::NotPF:
        return !ccflags.pf;
      case condition_tests::NotSxOF:
        return !(ccflags.sf ^ ccflags.of);
      case condition_tests::NotSxOvZF:
        return !((ccflags.sf ^ ccflags.of) | ccflags.zf);
    }
    panic("Unknown condition: %d\n", condition);
    return true;
}

std::unique_ptr<PCStateBase>
X86MicroopBase::branchTarget(const PCStateBase &branch_pc) const
{
    PCStateBase *pcs = branch_pc.clone();
    DPRINTF(X86, "branchTarget PC info: %s, Immediate: %lx\n", *pcs,
            (int64_t)machInst.immediate);
    auto &xpc = pcs->as<PCState>();
    xpc.npc(xpc.npc() + (int64_t)machInst.immediate);
    xpc.uEnd();
    return std::unique_ptr<PCStateBase>{pcs};
}

} // namespace X86ISA
} // namespace gem5