dyn_inst_impl.hh revision 7720:65d338a8dba4 
1/*
2 * Copyright (c) 2004-2006 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
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Kevin Lim
29 */
30
31#include "base/cp_annotate.hh"
32#include "cpu/o3/dyn_inst.hh"
33
34template <class Impl>
35BaseO3DynInst<Impl>::BaseO3DynInst(StaticInstPtr staticInst,
36                                   TheISA::PCState pc, TheISA::PCState predPC,
37                                   InstSeqNum seq_num, O3CPU *cpu)
38    : BaseDynInst<Impl>(staticInst, pc, predPC, seq_num, cpu)
39{
40    initVars();
41}
42
43template <class Impl>
44BaseO3DynInst<Impl>::BaseO3DynInst(ExtMachInst inst,
45                                   TheISA::PCState pc, TheISA::PCState predPC,
46                                   InstSeqNum seq_num, O3CPU *cpu)
47    : BaseDynInst<Impl>(inst, pc, predPC, seq_num, cpu)
48{
49    initVars();
50}
51
52template <class Impl>
53BaseO3DynInst<Impl>::BaseO3DynInst(StaticInstPtr &_staticInst)
54    : BaseDynInst<Impl>(_staticInst)
55{
56    initVars();
57}
58
59template <class Impl>
60void
61BaseO3DynInst<Impl>::initVars()
62{
63    // Make sure to have the renamed register entries set to the same
64    // as the normal register entries.  It will allow the IQ to work
65    // without any modifications.
66    for (int i = 0; i < this->staticInst->numDestRegs(); i++) {
67        this->_destRegIdx[i] = this->staticInst->destRegIdx(i);
68    }
69
70    for (int i = 0; i < this->staticInst->numSrcRegs(); i++) {
71        this->_srcRegIdx[i] = this->staticInst->srcRegIdx(i);
72        this->_readySrcRegIdx[i] = 0;
73    }
74}
75
76template <class Impl>
77Fault
78BaseO3DynInst<Impl>::execute()
79{
80    // @todo: Pretty convoluted way to avoid squashing from happening
81    // when using the TC during an instruction's execution
82    // (specifically for instructions that have side-effects that use
83    // the TC).  Fix this.
84    bool in_syscall = this->thread->inSyscall;
85    this->thread->inSyscall = true;
86
87    this->fault = this->staticInst->execute(this, this->traceData);
88
89    this->thread->inSyscall = in_syscall;
90
91    return this->fault;
92}
93
94template <class Impl>
95Fault
96BaseO3DynInst<Impl>::initiateAcc()
97{
98    // @todo: Pretty convoluted way to avoid squashing from happening
99    // when using the TC during an instruction's execution
100    // (specifically for instructions that have side-effects that use
101    // the TC).  Fix this.
102    bool in_syscall = this->thread->inSyscall;
103    this->thread->inSyscall = true;
104
105    this->fault = this->staticInst->initiateAcc(this, this->traceData);
106
107    this->thread->inSyscall = in_syscall;
108
109    return this->fault;
110}
111
112template <class Impl>
113Fault
114BaseO3DynInst<Impl>::completeAcc(PacketPtr pkt)
115{
116    this->fault = this->staticInst->completeAcc(pkt, this, this->traceData);
117
118    return this->fault;
119}
120
121#if FULL_SYSTEM
122template <class Impl>
123Fault
124BaseO3DynInst<Impl>::hwrei()
125{
126#if THE_ISA == ALPHA_ISA
127    // Can only do a hwrei when in pal mode.
128    if (!(this->instAddr() & 0x3))
129        return new AlphaISA::UnimplementedOpcodeFault;
130
131    // Set the next PC based on the value of the EXC_ADDR IPR.
132    AlphaISA::PCState pc = this->pcState();
133    pc.npc(this->cpu->readMiscRegNoEffect(AlphaISA::IPR_EXC_ADDR,
134                                          this->threadNumber));
135    this->pcState(pc);
136    if (CPA::available()) {
137        ThreadContext *tc = this->cpu->tcBase(this->threadNumber);
138        CPA::cpa()->swAutoBegin(tc, this->nextInstAddr());
139    }
140
141    // Tell CPU to clear any state it needs to if a hwrei is taken.
142    this->cpu->hwrei(this->threadNumber);
143#else
144
145#endif
146    // FIXME: XXX check for interrupts? XXX
147    return NoFault;
148}
149
150template <class Impl>
151void
152BaseO3DynInst<Impl>::trap(Fault fault)
153{
154    this->cpu->trap(fault, this->threadNumber, this->staticInst);
155}
156
157template <class Impl>
158bool
159BaseO3DynInst<Impl>::simPalCheck(int palFunc)
160{
161#if THE_ISA != ALPHA_ISA
162    panic("simPalCheck called, but PAL only exists in Alpha!\n");
163#endif
164    return this->cpu->simPalCheck(palFunc, this->threadNumber);
165}
166#else
167template <class Impl>
168void
169BaseO3DynInst<Impl>::syscall(int64_t callnum)
170{
171    // HACK: check CPU's nextPC before and after syscall. If it
172    // changes, update this instruction's nextPC because the syscall
173    // must have changed the nextPC.
174    TheISA::PCState curPC = this->cpu->pcState(this->threadNumber);
175    this->cpu->syscall(callnum, this->threadNumber);
176    TheISA::PCState newPC = this->cpu->pcState(this->threadNumber);
177    if (!(curPC == newPC)) {
178        this->pcState(newPC);
179    }
180}
181#endif
182
183