isa_traits.hh revision 2632:1bb2f91485ea
1/*
2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef __ARCH_SPARC_ISA_TRAITS_HH__
30#define __ARCH_SPARC_ISA_TRAITS_HH__
31
32#include "base/misc.hh"
33#include "config/full_system.hh"
34#include "sim/host.hh"
35
36class ExecContext;
37class FastCPU;
38//class FullCPU;
39class Checkpoint;
40
41class StaticInst;
42class StaticInstPtr;
43
44namespace BigEndianGuest {}
45
46#if !FULL_SYSTEM
47class SyscallReturn
48{
49  public:
50    template <class T>
51    SyscallReturn(T v, bool s)
52    {
53        retval = (uint64_t)v;
54        success = s;
55    }
56
57    template <class T>
58    SyscallReturn(T v)
59    {
60        success = (v >= 0);
61        retval = (uint64_t)v;
62    }
63
64    ~SyscallReturn() {}
65
66    SyscallReturn& operator=(const SyscallReturn& s)
67    {
68        retval = s.retval;
69        success = s.success;
70        return *this;
71    }
72
73    bool successful() { return success; }
74    uint64_t value() { return retval; }
75
76    private:
77    uint64_t retval;
78    bool success;
79};
80
81#endif
82
83
84namespace SparcISA
85{
86
87    // These enumerate all the registers for dependence tracking.
88    enum DependenceTags {
89        // 0..31 are the integer regs 0..31
90        // 32..63 are the FP regs 0..31, i.e. use (reg + FP_Base_DepTag)
91        FP_Base_DepTag = 32,
92        Ctrl_Base_DepTag = 96,
93        //XXX These are here solely to get compilation and won't work
94        Fpcr_DepTag = 0,
95        Uniq_DepTag = 0
96    };
97
98    //This makes sure the big endian versions of certain functions are used.
99    using namespace BigEndianGuest;
100
101    typedef uint32_t MachInst;
102    typedef uint64_t ExtMachInst;
103
104    const int NumIntRegs = 32;
105    const int NumFloatRegs = 64;
106    const int NumMiscRegs = 32;
107
108    // semantically meaningful register indices
109    const int ZeroReg = 0;	// architecturally meaningful
110    // the rest of these depend on the ABI
111    const int StackPointerReg = 14;
112    const int ReturnAddressReg = 31; // post call, precall is 15
113    const int ReturnValueReg = 8; // Post return, 24 is pre-return.
114    const int FramePointerReg = 30;
115    const int ArgumentReg0 = 8;
116    const int ArgumentReg1 = 9;
117    const int ArgumentReg2 = 10;
118    const int ArgumentReg3 = 11;
119    const int ArgumentReg4 = 12;
120    const int ArgumentReg5 = 13;
121    // Some OS syscall use a second register (o1) to return a second value
122    const int SyscallPseudoReturnReg = ArgumentReg1;
123
124    //XXX These numbers are bogus
125    const int MaxInstSrcRegs = 8;
126    const int MaxInstDestRegs = 9;
127
128    typedef uint64_t IntReg;
129
130    // control register file contents
131    typedef uint64_t MiscReg;
132
133    typedef double FloatReg;
134    typedef uint64_t FloatRegBits;
135
136    //8K. This value is implmentation specific; and should probably
137    //be somewhere else.
138    const int LogVMPageSize = 13;
139    const int VMPageSize = (1 << LogVMPageSize);
140
141    //Why does both the previous set of constants and this one exist?
142    const int PageShift = 13;
143    const int PageBytes = ULL(1) << PageShift;
144
145    const int BranchPredAddrShiftAmt = 2;
146
147    const int MachineBytes = 8;
148    const int WordBytes = 4;
149    const int HalfwordBytes = 2;
150    const int ByteBytes = 1;
151
152    void serialize(std::ostream & os);
153
154    void unserialize(Checkpoint *cp, const std::string &section);
155
156    StaticInstPtr decodeInst(ExtMachInst);
157
158    // return a no-op instruction... used for instruction fetch faults
159    extern const MachInst NoopMachInst;
160}
161
162#include "arch/sparc/regfile.hh"
163
164namespace SparcISA
165{
166
167#if !FULL_SYSTEM
168    static inline void setSyscallReturn(SyscallReturn return_value,
169            RegFile *regs)
170    {
171        // check for error condition.  SPARC syscall convention is to
172        // indicate success/failure in reg the carry bit of the ccr
173        // and put the return value itself in the standard return value reg ().
174        if (return_value.successful()) {
175            // no error
176            regs->setMiscReg(MISCREG_CCR_XCC_C, 0);
177            regs->setIntReg(ReturnValueReg, return_value.value());
178        } else {
179            // got an error, return details
180            regs->setMiscReg(MISCREG_CCR_XCC_C, 1);
181            regs->setIntReg(ReturnValueReg, return_value.value());
182        }
183    }
184#endif
185};
186
187#endif // __ARCH_SPARC_ISA_TRAITS_HH__
188