isa_traits.hh revision 7654:7447a92d1ad5
1/* 2 * Copyright (c) 2010 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Copyright (c) 2003-2005 The Regents of The University of Michigan 15 * Copyright (c) 2007-2008 The Florida State University 16 * All rights reserved. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions are 20 * met: redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer; 22 * redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution; 25 * neither the name of the copyright holders nor the names of its 26 * contributors may be used to endorse or promote products derived from 27 * this software without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 40 * 41 * Authors: Gabe Black 42 * Stephen Hines 43 */ 44 45#ifndef __ARCH_ARM_ISA_TRAITS_HH__ 46#define __ARCH_ARM_ISA_TRAITS_HH__ 47 48#include "arch/arm/types.hh" 49#include "base/types.hh" 50 51namespace LittleEndianGuest {}; 52 53#define TARGET_ARM 54 55class StaticInstPtr; 56 57namespace ArmISA 58{ 59 using namespace LittleEndianGuest; 60 61 StaticInstPtr decodeInst(ExtMachInst); 62 63 // ARM DOES NOT have a delay slot 64 #define ISA_HAS_DELAY_SLOT 0 65 66 const Addr PageShift = 12; 67 const Addr PageBytes = ULL(1) << PageShift; 68 const Addr Page_Mask = ~(PageBytes - 1); 69 const Addr PageOffset = PageBytes - 1; 70 71 72 //////////////////////////////////////////////////////////////////////// 73 // 74 // Translation stuff 75 // 76 77 const Addr PteShift = 3; 78 const Addr NPtePageShift = PageShift - PteShift; 79 const Addr NPtePage = ULL(1) << NPtePageShift; 80 const Addr PteMask = NPtePage - 1; 81 82 //// All 'Mapped' segments go through the TLB 83 //// All other segments are translated by dropping the MSB, to give 84 //// the corresponding physical address 85 // User Segment - Mapped 86 const Addr USegBase = ULL(0x0); 87 const Addr USegEnd = ULL(0x7FFFFFFF); 88 89 const unsigned VABits = 32; 90 const unsigned PABits = 32; // Is this correct? 91 const Addr VAddrImplMask = (ULL(1) << VABits) - 1; 92 const Addr VAddrUnImplMask = ~VAddrImplMask; 93 inline Addr VAddrImpl(Addr a) { return a & VAddrImplMask; } 94 inline Addr VAddrVPN(Addr a) { return a >> ArmISA::PageShift; } 95 inline Addr VAddrOffset(Addr a) { return a & ArmISA::PageOffset; } 96 97 const Addr PAddrImplMask = (ULL(1) << PABits) - 1; 98 99 // return a no-op instruction... used for instruction fetch faults 100 const ExtMachInst NoopMachInst = 0x00000000; 101 102 const int LogVMPageSize = 12; // 4K bytes 103 const int VMPageSize = (1 << LogVMPageSize); 104 105 // Shouldn't this be 1 because of Thumb?! Dynamic? --Ali 106 const int BranchPredAddrShiftAmt = 2; // instructions are 4-byte aligned 107 108 const int MachineBytes = 4; 109 const int WordBytes = 4; 110 const int HalfwordBytes = 2; 111 const int ByteBytes = 1; 112 113 const uint32_t HighVecs = 0xFFFF0000; 114 115 // Memory accesses cannot be unaligned 116 const bool HasUnalignedMemAcc = true; 117 118 enum InterruptTypes 119 { 120 INT_RST, 121 INT_ABT, 122 INT_IRQ, 123 INT_FIQ, 124 NumInterruptTypes 125 }; 126 127 // These otherwise unused bits of the PC are used to select a mode 128 // like the J and T bits of the CPSR. 129 static const Addr PcJBitShift = 33; 130 static const Addr PcTBitShift = 34; 131 static const Addr PcModeMask = (ULL(1) << PcJBitShift) | 132 (ULL(1) << PcTBitShift); 133}; 134 135using namespace ArmISA; 136 137#endif // __ARCH_ARM_ISA_TRAITS_HH__ 138