utility.hh revision 6383:31c067ae3331 
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
48uint64_t getArgument(ThreadContext *tc, int number, bool fp);
49
50////////////////////////////////////////////////////////////////////////
51//
52// Floating Point Utility Functions
53//
54uint64_t fpConvert(ConvertType cvt_type, double fp_val);
55double roundFP(double val, int digits);
56double truncFP(double val);
57
58bool getCondCode(uint32_t fcsr, int cc);
59uint32_t genCCVector(uint32_t fcsr, int num, uint32_t cc_val);
60uint32_t genInvalidVector(uint32_t fcsr);
61
62bool isNan(void *val_ptr, int size);
63bool isQnan(void *val_ptr, int size);
64bool isSnan(void *val_ptr, int size);
65
66static inline bool
67inUserMode(ThreadContext *tc)
68{
69    MiscReg Stat = tc->readMiscReg(MISCREG_STATUS);
70    MiscReg Dbg = tc->readMiscReg(MISCREG_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
83static inline Addr realPCToFetchPC(const Addr &addr) {
84    return addr;
85}
86
87static 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)
93static inline size_t fetchInstSize() {
94    return sizeof(MachInst);
95}
96
97////////////////////////////////////////////////////////////////////////
98//
99//  Register File Utility Functions
100//
101static inline MachInst makeRegisterCopy(int dest, int src) {
102    panic("makeRegisterCopy not implemented");
103    return 0;
104}
105
106template <class CPU>
107void zeroRegisters(CPU *cpu);
108
109////////////////////////////////////////////////////////////////////////
110//
111//  Translation stuff
112//
113inline Addr
114TruncPage(Addr addr)
115{ return addr & ~(PageBytes - 1); }
116
117inline Addr
118RoundPage(Addr addr)
119{ return (addr + PageBytes - 1) & ~(PageBytes - 1); }
120
121////////////////////////////////////////////////////////////////////////
122//
123// CPU Utility
124//
125void startupCPU(ThreadContext *tc, int cpuId);
126
127void copyRegs(ThreadContext *src, ThreadContext *dest);
128void copyMiscRegs(ThreadContext *src, ThreadContext *dest);
129
130};
131
132
133#endif
134