utility.hh revision 6313:95f69a436c82 
1/*
2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
3 * Copyright (c) 2007 MIPS Technologies, Inc.
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: Nathan Binkert
30 *          Steve Reinhardt
31 *          Korey Sewell
32 */
33
34#ifndef __ARCH_MIPS_UTILITY_HH__
35#define __ARCH_MIPS_UTILITY_HH__
36#include "config/full_system.hh"
37#include "arch/mips/types.hh"
38#include "arch/mips/isa_traits.hh"
39#include "base/misc.hh"
40#include "base/types.hh"
41#include "config/full_system.hh"
42#include "cpu/thread_context.hh"
43
44class ThreadContext;
45
46namespace MipsISA {
47
48    uint64_t getArgument(ThreadContext *tc, int number, bool fp);
49
50    ////////////////////////////////////////////////////////////////////////
51    //
52    // Floating Point Utility Functions
53    //
54    uint64_t fpConvert(ConvertType cvt_type, double fp_val);
55    double roundFP(double val, int digits);
56    double truncFP(double val);
57
58    bool getCondCode(uint32_t fcsr, int cc);
59    uint32_t genCCVector(uint32_t fcsr, int num, uint32_t cc_val);
60    uint32_t genInvalidVector(uint32_t fcsr);
61
62    bool isNan(void *val_ptr, int size);
63    bool isQnan(void *val_ptr, int size);
64    bool isSnan(void *val_ptr, int size);
65
66    static inline bool
67    inUserMode(ThreadContext *tc)
68    {
69        MiscReg Stat = tc->readMiscReg(MipsISA::Status);
70        MiscReg Dbg = tc->readMiscReg(MipsISA::Debug);
71
72        if((Stat & 0x10000006) == 0  // EXL, ERL or CU0 set, CP0 accessible
73           && (Dbg & 0x40000000) == 0 // DM bit set, CP0 accessible
74           && (Stat & 0x00000018) != 0) {  // KSU = 0, kernel mode is base mode
75            // Unable to use Status_CU0, etc directly, using bitfields & masks
76            return true;
77        } else {
78            return false;
79        }
80    }
81
82    // Instruction address compression hooks
83    static inline Addr realPCToFetchPC(const Addr &addr) {
84        return addr;
85    }
86
87    static inline Addr fetchPCToRealPC(const Addr &addr) {
88        return addr;
89    }
90
91    // the size of "fetched" instructions (not necessarily the size
92    // of real instructions for PISA)
93    static inline size_t fetchInstSize() {
94        return sizeof(MachInst);
95    }
96
97    ////////////////////////////////////////////////////////////////////////
98    //
99    //  Register File Utility Functions
100    //
101    static inline MachInst makeRegisterCopy(int dest, int src) {
102        panic("makeRegisterCopy not implemented");
103        return 0;
104    }
105
106    void copyRegs(ThreadContext *src, ThreadContext *dest);
107
108    void copyMiscRegs(ThreadContext *src, ThreadContext *dest);
109
110
111    template <class CPU>
112    void zeroRegisters(CPU *cpu);
113
114    ////////////////////////////////////////////////////////////////////////
115    //
116    //  Translation stuff
117    //
118    inline Addr
119    TruncPage(Addr addr)
120    { return addr & ~(PageBytes - 1); }
121
122    inline Addr
123    RoundPage(Addr addr)
124    { return (addr + PageBytes - 1) & ~(PageBytes - 1); }
125
126    ////////////////////////////////////////////////////////////////////////
127    //
128    // CPU Utility
129    //
130    void startupCPU(ThreadContext *tc, int cpuId);
131};
132
133
134#endif
135