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
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
46template <class Impl>
47BaseO3DynInst<Impl>::BaseO3DynInst(StaticInstPtr staticInst,
48 StaticInstPtr macroop,
49 TheISA::PCState pc, TheISA::PCState predPC,
50 InstSeqNum seq_num, O3CPU *cpu)
51 : BaseDynInst<Impl>(staticInst, macroop, pc, predPC, seq_num, cpu)
52{
53 initVars();
54}
55
56template <class Impl>
57BaseO3DynInst<Impl>::BaseO3DynInst(StaticInstPtr _staticInst,
58 StaticInstPtr _macroop)
59 : BaseDynInst<Impl>(_staticInst, _macroop)
60{
61 initVars();
62}
63
64template <class Impl>
65void
66BaseO3DynInst<Impl>::initVars()
67{
68 // Make sure to have the renamed register entries set to the same
69 // as the normal register entries. It will allow the IQ to work
70 // without any modifications.
71 for (int i = 0; i < this->staticInst->numDestRegs(); i++) {
72 this->_destRegIdx[i] = this->staticInst->destRegIdx(i);
73 }
74
75 for (int i = 0; i < this->staticInst->numSrcRegs(); i++) {
76 this->_srcRegIdx[i] = this->staticInst->srcRegIdx(i);
77 this->_readySrcRegIdx[i] = 0;
78 }
79
80 _numDestMiscRegs = 0;
81
82#if TRACING_ON
83 fetchTick = 0;
84 decodeTick = 0;
85 renameTick = 0;
86 dispatchTick = 0;
87 issueTick = 0;
88 completeTick = 0;
89#endif
90}
91
92template <class Impl>
93Fault
94BaseO3DynInst<Impl>::execute()
95{
96 // @todo: Pretty convoluted way to avoid squashing from happening
97 // when using the TC during an instruction's execution
98 // (specifically for instructions that have side-effects that use
99 // the TC). Fix this.
100 bool in_syscall = this->thread->inSyscall;
101 this->thread->inSyscall = true;
102
103 this->fault = this->staticInst->execute(this, this->traceData);
104
105 this->thread->inSyscall = in_syscall;
106
107 return this->fault;
108}
109
110template <class Impl>
111Fault
112BaseO3DynInst<Impl>::initiateAcc()
113{
114 // @todo: Pretty convoluted way to avoid squashing from happening
115 // when using the TC during an instruction's execution
116 // (specifically for instructions that have side-effects that use
117 // the TC). Fix this.
118 bool in_syscall = this->thread->inSyscall;
119 this->thread->inSyscall = true;
120
121 this->fault = this->staticInst->initiateAcc(this, this->traceData);
122
123 this->thread->inSyscall = in_syscall;
124
125 return this->fault;
126}
127
128template <class Impl>
129Fault
130BaseO3DynInst<Impl>::completeAcc(PacketPtr pkt)
131{
132 // @todo: Pretty convoluted way to avoid squashing from happening
133 // when using the TC during an instruction's execution
134 // (specifically for instructions that have side-effects that use
135 // the TC). Fix this.
136 bool in_syscall = this->thread->inSyscall;
137 this->thread->inSyscall = true;
138
139 this->fault = this->staticInst->completeAcc(pkt, this, this->traceData);
140
141 this->thread->inSyscall = in_syscall;
142
143 return this->fault;
144}
145
146#if FULL_SYSTEM
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#endif
192
193template <class Impl>
194void
195BaseO3DynInst<Impl>::syscall(int64_t callnum)
196{
197#if FULL_SYSTEM
198 panic("Syscall emulation isn't available in FS mode.\n");
199#else
200 // HACK: check CPU's nextPC before and after syscall. If it
201 // changes, update this instruction's nextPC because the syscall
202 // must have changed the nextPC.
203 TheISA::PCState curPC = this->cpu->pcState(this->threadNumber);
204 this->cpu->syscall(callnum, this->threadNumber);
205 TheISA::PCState newPC = this->cpu->pcState(this->threadNumber);
206 if (!(curPC == newPC)) {
207 this->pcState(newPC);
208 }
209#endif
210}
211