1/*
2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
3 * Copyright (c) 2007-2008 The Florida State University
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met: redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer;
10 * redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution;
13 * neither the name of the copyright holders nor the names of its
14 * contributors may be used to endorse or promote products derived from
15 * this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * Authors: Gabe Black
30 * Stephen Hines
31 */
32
33#ifndef __ARCH_ARM_ISA_TRAITS_HH__
34#define __ARCH_ARM_ISA_TRAITS_HH__
35
36#include "arch/arm/max_inst_regs.hh"
37#include "arch/arm/types.hh"
38#include "base/types.hh"
39
40namespace LittleEndianGuest {};
41
42#define TARGET_ARM
43
44class StaticInstPtr;
45
46namespace ArmISA
47{
48 using namespace LittleEndianGuest;
49 using ArmISAInst::MaxInstSrcRegs;
50 using ArmISAInst::MaxInstDestRegs;
51
52 StaticInstPtr decodeInst(ExtMachInst);
53
54 // ARM DOES NOT have a delay slot
55 #define ISA_HAS_DELAY_SLOT 0
56
57 const Addr PageShift = 12;
58 const Addr PageBytes = ULL(1) << PageShift;
59 const Addr Page_Mask = ~(PageBytes - 1);
60 const Addr PageOffset = PageBytes - 1;
61
62
63 ////////////////////////////////////////////////////////////////////////
64 //
65 // Translation stuff
66 //
67
68 const Addr PteShift = 3;
69 const Addr NPtePageShift = PageShift - PteShift;
70 const Addr NPtePage = ULL(1) << NPtePageShift;
71 const Addr PteMask = NPtePage - 1;
72
73 //// All 'Mapped' segments go through the TLB
74 //// All other segments are translated by dropping the MSB, to give
75 //// the corresponding physical address
76 // User Segment - Mapped
77 const Addr USegBase = ULL(0x0);
78 const Addr USegEnd = ULL(0x7FFFFFFF);
79
80 // Kernel Segment 0 - Unmapped
81 const Addr KSeg0End = ULL(0x9FFFFFFF);
82 const Addr KSeg0Base = ULL(0x80000000);
83 const Addr KSeg0Mask = ULL(0x1FFFFFFF);
84
85 // For loading... XXX This maybe could be USegEnd?? --ali
86 const Addr LoadAddrMask = ULL(0xffffffffff);
87
88 const unsigned VABits = 32;
89 const unsigned PABits = 32; // Is this correct?
90 const Addr VAddrImplMask = (ULL(1) << VABits) - 1;
91 const Addr VAddrUnImplMask = ~VAddrImplMask;
92 inline Addr VAddrImpl(Addr a) { return a & VAddrImplMask; }
93 inline Addr VAddrVPN(Addr a) { return a >> ArmISA::PageShift; }
94 inline Addr VAddrOffset(Addr a) { return a & ArmISA::PageOffset; }
95
96 const Addr PAddrImplMask = (ULL(1) << PABits) - 1;
97
98 // return a no-op instruction... used for instruction fetch faults
99 const ExtMachInst NoopMachInst = 0x00000000;
100
101 // Constants Related to the number of registers
102 const int NumIntArchRegs = 16;
103 const int NumIntSpecialRegs = 19;
104 const int NumFloatArchRegs = 16;
105 const int NumFloatSpecialRegs = 5;
106 const int NumInternalProcRegs = 0;
107
108 const int NumIntRegs = NumIntArchRegs + NumIntSpecialRegs;
109 const int NumFloatRegs = NumFloatArchRegs + NumFloatSpecialRegs;
110
111 // semantically meaningful register indices
112 const int ReturnValueReg = 0;
113 const int ReturnValueReg1 = 1;
114 const int ReturnValueReg2 = 2;
115 const int ArgumentReg0 = 0;
116 const int ArgumentReg1 = 1;
117 const int ArgumentReg2 = 2;
118 const int ArgumentReg3 = 3;
119 const int FramePointerReg = 11;
120 const int StackPointerReg = 13;
121 const int ReturnAddressReg = 14;
122 const int PCReg = 15;
123
124 const int ZeroReg = NumIntArchRegs;
125 const int AddrReg = ZeroReg + 1; // Used to generate address for uops
126
127 const int SyscallNumReg = ReturnValueReg;
128 const int SyscallPseudoReturnReg = ReturnValueReg;
129 const int SyscallSuccessReg = ReturnValueReg;
130
131 const int LogVMPageSize = 12; // 4K bytes
132 const int VMPageSize = (1 << LogVMPageSize);
133
134 const int BranchPredAddrShiftAmt = 2; // instructions are 4-byte aligned
135
136 const int MachineBytes = 4;
137 const int WordBytes = 4;
138 const int HalfwordBytes = 2;
139 const int ByteBytes = 1;
140
141 // These help enumerate all the registers for dependence tracking.
142 const int FP_Base_DepTag = NumIntRegs;
143 const int Ctrl_Base_DepTag = FP_Base_DepTag + NumFloatRegs;
144};
145
146using namespace ArmISA;
147
148#endif // __ARCH_ARM_ISA_TRAITS_HH__