decoder.cc (10037:5cac77888310) decoder.cc (10610:5fae03bd840a)
1/*
1/*
2 * Copyright (c) 2012-2013 ARM Limited
2 * Copyright (c) 2012-2014 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

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46#include "base/trace.hh"
47#include "debug/Decoder.hh"
48
49namespace ArmISA
50{
51
52GenericISA::BasicDecodeCache Decoder::defaultCache;
53
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

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46#include "base/trace.hh"
47#include "debug/Decoder.hh"
48
49namespace ArmISA
50{
51
52GenericISA::BasicDecodeCache Decoder::defaultCache;
53
54Decoder::Decoder()
55 : data(0), fpscrLen(0), fpscrStride(0)
56{
57 reset();
58}
59
54void
60void
61Decoder::reset()
62{
63 bigThumb = false;
64 offset = 0;
65 emi = 0;
66 instDone = false;
67 outOfBytes = true;
68 foundIt = false;
69}
70
71void
55Decoder::process()
56{
57 // emi is typically ready, with some caveats below...
58 instDone = true;
59
60 if (!emi.thumb) {
61 emi.instBits = data;
62 if (!emi.aarch64) {

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113 "IT detected, cond = %#x, mask = %#x\n",
114 itBits.cond, itBits.mask);
115 }
116 }
117 }
118 }
119}
120
72Decoder::process()
73{
74 // emi is typically ready, with some caveats below...
75 instDone = true;
76
77 if (!emi.thumb) {
78 emi.instBits = data;
79 if (!emi.aarch64) {

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130 "IT detected, cond = %#x, mask = %#x\n",
131 itBits.cond, itBits.mask);
132 }
133 }
134 }
135 }
136}
137
121//Use this to give data to the decoder. This should be used
122//when there is control flow.
123void
138void
139Decoder::consumeBytes(int numBytes)
140{
141 offset += numBytes;
142 assert(offset <= sizeof(MachInst));
143 if (offset == sizeof(MachInst))
144 outOfBytes = true;
145}
146
147void
124Decoder::moreBytes(const PCState &pc, Addr fetchPC, MachInst inst)
125{
126 data = inst;
127 offset = (fetchPC >= pc.instAddr()) ? 0 : pc.instAddr() - fetchPC;
128 emi.thumb = pc.thumb();
129 emi.aarch64 = pc.aarch64();
130 emi.fpscrLen = fpscrLen;
131 emi.fpscrStride = fpscrStride;
132
133 outOfBytes = false;
134 process();
135}
136
148Decoder::moreBytes(const PCState &pc, Addr fetchPC, MachInst inst)
149{
150 data = inst;
151 offset = (fetchPC >= pc.instAddr()) ? 0 : pc.instAddr() - fetchPC;
152 emi.thumb = pc.thumb();
153 emi.aarch64 = pc.aarch64();
154 emi.fpscrLen = fpscrLen;
155 emi.fpscrStride = fpscrStride;
156
157 outOfBytes = false;
158 process();
159}
160
161StaticInstPtr
162Decoder::decode(ArmISA::PCState &pc)
163{
164 if (!instDone)
165 return NULL;
166
167 const int inst_size((!emi.thumb || emi.bigThumb) ? 4 : 2);
168 ExtMachInst this_emi(emi);
169
170 pc.npc(pc.pc() + inst_size);
171 if (foundIt)
172 pc.nextItstate(itBits);
173 this_emi.itstate = pc.itstate();
174 pc.size(inst_size);
175
176 emi = 0;
177 instDone = false;
178 foundIt = false;
179
180 return decode(this_emi, pc.instAddr());
137}
181}
182
183}