1/*
2 * Copyright (c) 2010-2011 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
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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 }
79
80 this->_readySrcRegIdx.reset();
81
82 _numDestMiscRegs = 0;
83
84#if TRACING_ON
85 fetchTick = 0;
86 decodeTick = 0;
87 renameTick = 0;
88 dispatchTick = 0;
89 issueTick = 0;
90 completeTick = 0;
91#endif
92}
93
94template <class Impl>
95Fault
96BaseO3DynInst<Impl>::execute()
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->execute(this, this->traceData);
106
107 this->thread->inSyscall = in_syscall;
108
109 return this->fault;
110}
111
112template <class Impl>
113Fault
114BaseO3DynInst<Impl>::initiateAcc()
115{
116 // @todo: Pretty convoluted way to avoid squashing from happening
117 // when using the TC during an instruction's execution
118 // (specifically for instructions that have side-effects that use
119 // the TC). Fix this.
120 bool in_syscall = this->thread->inSyscall;
121 this->thread->inSyscall = true;
122
123 this->fault = this->staticInst->initiateAcc(this, this->traceData);
124
125 this->thread->inSyscall = in_syscall;
126
127 return this->fault;
128}
129
130template <class Impl>
131Fault
132BaseO3DynInst<Impl>::completeAcc(PacketPtr pkt)
133{
134 // @todo: Pretty convoluted way to avoid squashing from happening
135 // when using the TC during an instruction's execution
136 // (specifically for instructions that have side-effects that use
137 // the TC). Fix this.
138 bool in_syscall = this->thread->inSyscall;
139 this->thread->inSyscall = true;
140
141 if (this->cpu->checker) {
142 if (this->isStoreConditional()) {
143 this->reqToVerify->setExtraData(pkt->req->getExtraData());
144 }
145 }
146
147 this->fault = this->staticInst->completeAcc(pkt, this, this->traceData);
148
149 this->thread->inSyscall = in_syscall;
150
151 return this->fault;
152}
153
154template <class Impl>
155Fault
156BaseO3DynInst<Impl>::hwrei()
157{
158#if THE_ISA == ALPHA_ISA
159 // Can only do a hwrei when in pal mode.
160 if (!(this->instAddr() & 0x3))
161 return new AlphaISA::UnimplementedOpcodeFault;
162
163 // Set the next PC based on the value of the EXC_ADDR IPR.
164 AlphaISA::PCState pc = this->pcState();
165 pc.npc(this->cpu->readMiscRegNoEffect(AlphaISA::IPR_EXC_ADDR,
166 this->threadNumber));
167 this->pcState(pc);
168 if (CPA::available()) {
169 ThreadContext *tc = this->cpu->tcBase(this->threadNumber);
170 CPA::cpa()->swAutoBegin(tc, this->nextInstAddr());
171 }
172
173 // Tell CPU to clear any state it needs to if a hwrei is taken.
174 this->cpu->hwrei(this->threadNumber);
175#else
176
177#endif
178 // FIXME: XXX check for interrupts? XXX
179 return NoFault;
180}
181
182template <class Impl>
183void
184BaseO3DynInst<Impl>::trap(Fault fault)
185{
186 this->cpu->trap(fault, this->threadNumber, this->staticInst);
187}
188
189template <class Impl>
190bool
191BaseO3DynInst<Impl>::simPalCheck(int palFunc)
192{
193#if THE_ISA != ALPHA_ISA
194 panic("simPalCheck called, but PAL only exists in Alpha!\n");
195#endif
196 return this->cpu->simPalCheck(palFunc, this->threadNumber);
197}
198
199template <class Impl>
200void
201BaseO3DynInst<Impl>::syscall(int64_t callnum)
202{
203 if (FullSystem)
204 panic("Syscall emulation isn't available in FS mode.\n");
205
206 // HACK: check CPU's nextPC before and after syscall. If it
207 // changes, update this instruction's nextPC because the syscall
208 // must have changed the nextPC.
209 TheISA::PCState curPC = this->cpu->pcState(this->threadNumber);
210 this->cpu->syscall(callnum, this->threadNumber);
211 TheISA::PCState newPC = this->cpu->pcState(this->threadNumber);
212 if (!(curPC == newPC)) {
213 this->pcState(newPC);
214 }
215}
216