xref: /gem5/src/arch/x86/registers.hh

/*
 * Copyright (c) 2007 The Hewlett-Packard Development Company
 * Copyright (c) 2013 Advanced Micro Devices, Inc.
 * All rights reserved.
 *
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 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
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 *
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 * 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
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 * 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.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * Authors: Gabe Black
 */

#ifndef __ARCH_X86_REGISTERS_HH__
#define __ARCH_X86_REGISTERS_HH__

#include "arch/x86/generated/max_inst_regs.hh"
#include "arch/x86/regs/int.hh"
#include "arch/x86/regs/misc.hh"
#include "arch/x86/x86_traits.hh"

namespace X86ISA
{
using X86ISAInst::MaxInstSrcRegs;
using X86ISAInst::MaxInstDestRegs;
using X86ISAInst::MaxMiscDestRegs;
const int NumMiscRegs = NUM_MISCREGS;

const int NumIntArchRegs = NUM_INTREGS;
const int NumIntRegs =
    NumIntArchRegs + NumMicroIntRegs +
    NumPseudoIntRegs + NumImplicitIntRegs;

// Each 128 bit xmm register is broken into two effective 64 bit registers.
// Add 8 for the indices that are mapped over the fp stack
const int NumFloatRegs =
    NumMMXRegs + 2 * NumXMMRegs + NumMicroFpRegs + 8;

// These enumerate all the registers for dependence tracking.
enum DependenceTags {
    // FP_Base_DepTag must be large enough to be bigger than any integer
    // register index which has the IntFoldBit (1 << 6) set.  To be safe
    // we just start at (1 << 7) == 128.
    FP_Base_DepTag = 128,
    Ctrl_Base_DepTag = FP_Base_DepTag + NumFloatRegs,
    Max_DepTag = Ctrl_Base_DepTag + NumMiscRegs
};

// semantically meaningful register indices
//There is no such register in X86
const int ZeroReg = NUM_INTREGS;
const int StackPointerReg = INTREG_RSP;
//X86 doesn't seem to have a link register
const int ReturnAddressReg = 0;
const int ReturnValueReg = INTREG_RAX;
const int FramePointerReg = INTREG_RBP;

// Some OS syscalls use a second register (rdx) to return a second
// value
const int SyscallPseudoReturnReg = INTREG_RDX;

typedef uint64_t IntReg;
//XXX Should this be a 128 bit structure for XMM memory ops?
typedef uint64_t LargestRead;
typedef uint64_t MiscReg;

//These floating point types are correct for mmx, but not
//technically for x87 (80 bits) or at all for xmm (128 bits)
typedef double FloatReg;
typedef uint64_t FloatRegBits;
typedef union
{
    IntReg intReg;
    FloatReg fpReg;
    MiscReg ctrlReg;
} AnyReg;

typedef uint16_t RegIndex;

} // namespace X86ISA

#endif // __ARCH_X86_REGFILE_HH__