dyn_inst_impl.hh revision 8779 
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) 2004-2006 The Regents of The University of Michigan
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Kevin Lim
41 */
42
43#include "base/cp_annotate.hh"
44#include "cpu/o3/dyn_inst.hh"
45#include "sim/full_system.hh"
46
47template <class Impl>
48BaseO3DynInst<Impl>::BaseO3DynInst(StaticInstPtr staticInst,
49                                   StaticInstPtr macroop,
50                                   TheISA::PCState pc, TheISA::PCState predPC,
51                                   InstSeqNum seq_num, O3CPU *cpu)
52    : BaseDynInst<Impl>(staticInst, macroop, pc, predPC, seq_num, cpu)
53{
54    initVars();
55}
56
57template <class Impl>
58BaseO3DynInst<Impl>::BaseO3DynInst(StaticInstPtr _staticInst,
59                                   StaticInstPtr _macroop)
60    : BaseDynInst<Impl>(_staticInst, _macroop)
61{
62    initVars();
63}
64
65template <class Impl>
66void
67BaseO3DynInst<Impl>::initVars()
68{
69    // Make sure to have the renamed register entries set to the same
70    // as the normal register entries.  It will allow the IQ to work
71    // without any modifications.
72    for (int i = 0; i < this->staticInst->numDestRegs(); i++) {
73        this->_destRegIdx[i] = this->staticInst->destRegIdx(i);
74    }
75
76    for (int i = 0; i < this->staticInst->numSrcRegs(); i++) {
77        this->_srcRegIdx[i] = this->staticInst->srcRegIdx(i);
78        this->_readySrcRegIdx[i] = 0;
79    }
80
81    _numDestMiscRegs = 0;
82
83#if TRACING_ON
84    fetchTick = 0;
85    decodeTick = 0;
86    renameTick = 0;
87    dispatchTick = 0;
88    issueTick = 0;
89    completeTick = 0;
90#endif
91}
92
93template <class Impl>
94Fault
95BaseO3DynInst<Impl>::execute()
96{
97    // @todo: Pretty convoluted way to avoid squashing from happening
98    // when using the TC during an instruction's execution
99    // (specifically for instructions that have side-effects that use
100    // the TC).  Fix this.
101    bool in_syscall = this->thread->inSyscall;
102    this->thread->inSyscall = true;
103
104    this->fault = this->staticInst->execute(this, this->traceData);
105
106    this->thread->inSyscall = in_syscall;
107
108    return this->fault;
109}
110
111template <class Impl>
112Fault
113BaseO3DynInst<Impl>::initiateAcc()
114{
115    // @todo: Pretty convoluted way to avoid squashing from happening
116    // when using the TC during an instruction's execution
117    // (specifically for instructions that have side-effects that use
118    // the TC).  Fix this.
119    bool in_syscall = this->thread->inSyscall;
120    this->thread->inSyscall = true;
121
122    this->fault = this->staticInst->initiateAcc(this, this->traceData);
123
124    this->thread->inSyscall = in_syscall;
125
126    return this->fault;
127}
128
129template <class Impl>
130Fault
131BaseO3DynInst<Impl>::completeAcc(PacketPtr pkt)
132{
133    // @todo: Pretty convoluted way to avoid squashing from happening
134    // when using the TC during an instruction's execution
135    // (specifically for instructions that have side-effects that use
136    // the TC).  Fix this.
137    bool in_syscall = this->thread->inSyscall;
138    this->thread->inSyscall = true;
139
140    this->fault = this->staticInst->completeAcc(pkt, this, this->traceData);
141
142    this->thread->inSyscall = in_syscall;
143
144    return this->fault;
145}
146
147template <class Impl>
148Fault
149BaseO3DynInst<Impl>::hwrei()
150{
151#if THE_ISA == ALPHA_ISA
152    // Can only do a hwrei when in pal mode.
153    if (!(this->instAddr() & 0x3))
154        return new AlphaISA::UnimplementedOpcodeFault;
155
156    // Set the next PC based on the value of the EXC_ADDR IPR.
157    AlphaISA::PCState pc = this->pcState();
158    pc.npc(this->cpu->readMiscRegNoEffect(AlphaISA::IPR_EXC_ADDR,
159                                          this->threadNumber));
160    this->pcState(pc);
161    if (CPA::available()) {
162        ThreadContext *tc = this->cpu->tcBase(this->threadNumber);
163        CPA::cpa()->swAutoBegin(tc, this->nextInstAddr());
164    }
165
166    // Tell CPU to clear any state it needs to if a hwrei is taken.
167    this->cpu->hwrei(this->threadNumber);
168#else
169
170#endif
171    // FIXME: XXX check for interrupts? XXX
172    return NoFault;
173}
174
175template <class Impl>
176void
177BaseO3DynInst<Impl>::trap(Fault fault)
178{
179    this->cpu->trap(fault, this->threadNumber, this->staticInst);
180}
181
182template <class Impl>
183bool
184BaseO3DynInst<Impl>::simPalCheck(int palFunc)
185{
186#if THE_ISA != ALPHA_ISA
187    panic("simPalCheck called, but PAL only exists in Alpha!\n");
188#endif
189    return this->cpu->simPalCheck(palFunc, this->threadNumber);
190}
191
192template <class Impl>
193void
194BaseO3DynInst<Impl>::syscall(int64_t callnum)
195{
196    if (FullSystem) {
197        panic("Syscall emulation isn't available in FS mode.\n");
198    } else {
199        // HACK: check CPU's nextPC before and after syscall. If it
200        // changes, update this instruction's nextPC because the syscall
201        // must have changed the nextPC.
202        TheISA::PCState curPC = this->cpu->pcState(this->threadNumber);
203        this->cpu->syscall(callnum, this->threadNumber);
204        TheISA::PCState newPC = this->cpu->pcState(this->threadNumber);
205        if (!(curPC == newPC)) {
206            this->pcState(newPC);
207        }
208    }
209}
210
211