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1 /*
2  * Copyright (C) 2012 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include "disassembler_mips.h"
18 
19 #include <ostream>
20 #include <sstream>
21 
22 #include "base/logging.h"
23 #include "base/stringprintf.h"
24 #include "thread.h"
25 
26 namespace art {
27 namespace mips {
28 
29 struct MipsInstruction {
30   uint32_t mask;
31   uint32_t value;
32   const char* name;
33   const char* args_fmt;
34 
Matchesart::mips::MipsInstruction35   bool Matches(uint32_t instruction) const {
36     return (instruction & mask) == value;
37   }
38 };
39 
40 static const uint32_t kOpcodeShift = 26;
41 
42 static const uint32_t kCop1 = (17 << kOpcodeShift);
43 
44 static const uint32_t kITypeMask = (0x3f << kOpcodeShift);
45 static const uint32_t kJTypeMask = (0x3f << kOpcodeShift);
46 static const uint32_t kRTypeMask = ((0x3f << kOpcodeShift) | (0x3f));
47 static const uint32_t kSpecial0Mask = (0x3f << kOpcodeShift);
48 static const uint32_t kSpecial2Mask = (0x3f << kOpcodeShift);
49 static const uint32_t kFpMask = kRTypeMask;
50 
51 static const MipsInstruction gMipsInstructions[] = {
52   // "sll r0, r0, 0" is the canonical "nop", used in delay slots.
53   { 0xffffffff, 0, "nop", "" },
54 
55   // R-type instructions.
56   { kRTypeMask, 0, "sll", "DTA", },
57   // 0, 1, movci
58   { kRTypeMask, 2, "srl", "DTA", },
59   { kRTypeMask, 3, "sra", "DTA", },
60   { kRTypeMask, 4, "sllv", "DTS", },
61   { kRTypeMask, 6, "srlv", "DTS", },
62   { kRTypeMask, 7, "srav", "DTS", },
63   { kRTypeMask, 8, "jr", "S", },
64   { kRTypeMask | (0x1f << 11), 9 | (31 << 11), "jalr", "S", },  // rd = 31 is implicit.
65   { kRTypeMask | (0x1f << 11), 9, "jr", "S", },  // rd = 0 is implicit.
66   { kRTypeMask, 9, "jalr", "DS", },  // General case.
67   { kRTypeMask | (0x1f << 6), 10, "movz", "DST", },
68   { kRTypeMask | (0x1f << 6), 11, "movn", "DST", },
69   { kRTypeMask, 12, "syscall", "", },  // TODO: code
70   { kRTypeMask, 13, "break", "", },  // TODO: code
71   { kRTypeMask, 15, "sync", "", },  // TODO: type
72   { kRTypeMask, 16, "mfhi", "D", },
73   { kRTypeMask, 17, "mthi", "S", },
74   { kRTypeMask, 18, "mflo", "D", },
75   { kRTypeMask, 19, "mtlo", "S", },
76   { kRTypeMask, 20, "dsllv", "DTS", },
77   { kRTypeMask, 22, "dsrlv", "DTS", },
78   { kRTypeMask, 23, "dsrav", "DTS", },
79   { kRTypeMask | (0x1f << 6), 24, "mult", "ST", },
80   { kRTypeMask | (0x1f << 6), 25, "multu", "ST", },
81   { kRTypeMask | (0x1f << 6), 26, "div", "ST", },
82   { kRTypeMask | (0x1f << 6), 27, "divu", "ST", },
83   { kRTypeMask | (0x1f << 6), 24 + (2 << 6), "mul", "DST", },
84   { kRTypeMask | (0x1f << 6), 24 + (3 << 6), "muh", "DST", },
85   { kRTypeMask | (0x1f << 6), 26 + (2 << 6), "div", "DST", },
86   { kRTypeMask | (0x1f << 6), 26 + (3 << 6), "mod", "DST", },
87   { kRTypeMask, 32, "add", "DST", },
88   { kRTypeMask, 33, "addu", "DST", },
89   { kRTypeMask, 34, "sub", "DST", },
90   { kRTypeMask, 35, "subu", "DST", },
91   { kRTypeMask, 36, "and", "DST", },
92   { kRTypeMask, 37, "or", "DST", },
93   { kRTypeMask, 38, "xor", "DST", },
94   { kRTypeMask, 39, "nor", "DST", },
95   { kRTypeMask, 42, "slt", "DST", },
96   { kRTypeMask, 43, "sltu", "DST", },
97   { kRTypeMask, 45, "daddu", "DST", },
98   { kRTypeMask, 46, "dsub", "DST", },
99   { kRTypeMask, 47, "dsubu", "DST", },
100   // TODO: tge[u], tlt[u], teg, tne
101   // TODO: seleqz, selnez
102   { kRTypeMask, 56, "dsll", "DTA", },
103   { kRTypeMask, 58, "dsrl", "DTA", },
104   { kRTypeMask, 59, "dsra", "DTA", },
105   { kRTypeMask, 60, "dsll32", "DTA", },
106   { kRTypeMask | (0x1f << 21), 62 | (1 << 21), "drotr32", "DTA", },
107   { kRTypeMask, 62, "dsrl32", "DTA", },
108   { kRTypeMask, 63, "dsra32", "DTA", },
109   { kRTypeMask, (31u << kOpcodeShift) | 3, "dext", "TSAZ", },
110   { kRTypeMask | (0x1f << 21) | (0x1f << 6), (31u << 26) | (16 << 6) | 32, "seb", "DT", },
111   { kRTypeMask | (0x1f << 21) | (0x1f << 6), (31u << 26) | (24 << 6) | 32, "seh", "DT", },
112 
113   // SPECIAL0
114   { kSpecial0Mask | 0x7ff, (2 << 6) | 24, "mul", "DST" },
115   { kSpecial0Mask | 0x7ff, (3 << 6) | 24, "muh", "DST" },
116   { kSpecial0Mask | 0x7ff, (2 << 6) | 25, "mulu", "DST" },
117   { kSpecial0Mask | 0x7ff, (3 << 6) | 25, "muhu", "DST" },
118   { kSpecial0Mask | 0x7ff, (2 << 6) | 26, "div", "DST" },
119   { kSpecial0Mask | 0x7ff, (3 << 6) | 26, "mod", "DST" },
120   { kSpecial0Mask | 0x7ff, (2 << 6) | 27, "divu", "DST" },
121   { kSpecial0Mask | 0x7ff, (3 << 6) | 27, "modu", "DST" },
122   { kSpecial0Mask | 0x7ff, (2 << 6) | 28, "dmul", "DST" },
123   { kSpecial0Mask | 0x7ff, (3 << 6) | 28, "dmuh", "DST" },
124   { kSpecial0Mask | 0x7ff, (2 << 6) | 29, "dmulu", "DST" },
125   { kSpecial0Mask | 0x7ff, (3 << 6) | 29, "dmuhu", "DST" },
126   { kSpecial0Mask | 0x7ff, (2 << 6) | 30, "ddiv", "DST" },
127   { kSpecial0Mask | 0x7ff, (3 << 6) | 30, "dmod", "DST" },
128   { kSpecial0Mask | 0x7ff, (2 << 6) | 31, "ddivu", "DST" },
129   { kSpecial0Mask | 0x7ff, (3 << 6) | 31, "dmodu", "DST" },
130   // TODO: [d]clz, [d]clo
131   // TODO: sdbbp
132 
133   // SPECIAL2
134   { kSpecial2Mask | 0x7ff, (28 << kOpcodeShift) | 2, "mul", "DST" },
135   { kSpecial2Mask | 0x7ff, (28 << kOpcodeShift) | 32, "clz", "DS" },
136   { kSpecial2Mask | 0xffff, (28 << kOpcodeShift) | 0, "madd", "ST" },
137   { kSpecial2Mask | 0xffff, (28 << kOpcodeShift) | 1, "maddu", "ST" },
138   { kSpecial2Mask | 0xffff, (28 << kOpcodeShift) | 2, "mul", "DST" },
139   { kSpecial2Mask | 0xffff, (28 << kOpcodeShift) | 4, "msub", "ST" },
140   { kSpecial2Mask | 0xffff, (28 << kOpcodeShift) | 5, "msubu", "ST" },
141   { kSpecial2Mask | 0x3f, (28 << kOpcodeShift) | 0x3f, "sdbbp", "" },  // TODO: code
142 
143   // J-type instructions.
144   { kJTypeMask, 2 << kOpcodeShift, "j", "L" },
145   { kJTypeMask, 3 << kOpcodeShift, "jal", "L" },
146 
147   // I-type instructions.
148   { kITypeMask, 4 << kOpcodeShift, "beq", "STB" },
149   { kITypeMask, 5 << kOpcodeShift, "bne", "STB" },
150   { kITypeMask | (0x1f << 16), 1 << kOpcodeShift | (1 << 16), "bgez", "SB" },
151   { kITypeMask | (0x1f << 16), 1 << kOpcodeShift | (0 << 16), "bltz", "SB" },
152   { kITypeMask | (0x1f << 16), 1 << kOpcodeShift | (2 << 16), "bltzl", "SB" },
153   { kITypeMask | (0x1f << 16), 1 << kOpcodeShift | (16 << 16), "bltzal", "SB" },
154   { kITypeMask | (0x1f << 16), 1 << kOpcodeShift | (18 << 16), "bltzall", "SB" },
155   { kITypeMask | (0x1f << 16), 6 << kOpcodeShift | (0 << 16), "blez", "SB" },
156   { kITypeMask, 6 << kOpcodeShift, "bgeuc", "STB" },
157   { kITypeMask | (0x1f << 16), 7 << kOpcodeShift | (0 << 16), "bgtz", "SB" },
158   { kITypeMask, 7 << kOpcodeShift, "bltuc", "STB" },
159   { kITypeMask | (0x1f << 16), 1 << kOpcodeShift | (6 << 16), "dahi", "Si", },
160   { kITypeMask | (0x1f << 16), 1 << kOpcodeShift | (30 << 16), "dati", "Si", },
161 
162   { 0xffff0000, (4 << kOpcodeShift), "b", "B" },
163   { 0xffff0000, (1 << kOpcodeShift) | (17 << 16), "bal", "B" },
164 
165   { kITypeMask, 8 << kOpcodeShift, "beqc", "STB" },
166 
167   { kITypeMask, 8 << kOpcodeShift, "addi", "TSi", },
168   { kITypeMask, 9 << kOpcodeShift, "addiu", "TSi", },
169   { kITypeMask, 10 << kOpcodeShift, "slti", "TSi", },
170   { kITypeMask, 11 << kOpcodeShift, "sltiu", "TSi", },
171   { kITypeMask, 12 << kOpcodeShift, "andi", "TSi", },
172   { kITypeMask, 13 << kOpcodeShift, "ori", "TSi", },
173   { kITypeMask, 14 << kOpcodeShift, "xori", "TSi", },
174   { kITypeMask | (0x1f << 21), 15 << kOpcodeShift, "lui", "TI", },
175   { kITypeMask, 15 << kOpcodeShift, "aui", "TSI", },
176 
177   { kITypeMask | (0x1f << 21), 22 << kOpcodeShift, "blezc", "TB" },
178 
179   // TODO: de-dup
180   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (1  << 21) | (1  << 16), "bgezc", "TB" },
181   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (2  << 21) | (2  << 16), "bgezc", "TB" },
182   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (3  << 21) | (3  << 16), "bgezc", "TB" },
183   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (4  << 21) | (4  << 16), "bgezc", "TB" },
184   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (5  << 21) | (5  << 16), "bgezc", "TB" },
185   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (6  << 21) | (6  << 16), "bgezc", "TB" },
186   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (7  << 21) | (7  << 16), "bgezc", "TB" },
187   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (8  << 21) | (8  << 16), "bgezc", "TB" },
188   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (9  << 21) | (9  << 16), "bgezc", "TB" },
189   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (10 << 21) | (10 << 16), "bgezc", "TB" },
190   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (11 << 21) | (11 << 16), "bgezc", "TB" },
191   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (12 << 21) | (12 << 16), "bgezc", "TB" },
192   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (13 << 21) | (13 << 16), "bgezc", "TB" },
193   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (14 << 21) | (14 << 16), "bgezc", "TB" },
194   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (15 << 21) | (15 << 16), "bgezc", "TB" },
195   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (16 << 21) | (16 << 16), "bgezc", "TB" },
196   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (17 << 21) | (17 << 16), "bgezc", "TB" },
197   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (18 << 21) | (18 << 16), "bgezc", "TB" },
198   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (19 << 21) | (19 << 16), "bgezc", "TB" },
199   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (20 << 21) | (20 << 16), "bgezc", "TB" },
200   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (21 << 21) | (21 << 16), "bgezc", "TB" },
201   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (22 << 21) | (22 << 16), "bgezc", "TB" },
202   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (23 << 21) | (23 << 16), "bgezc", "TB" },
203   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (24 << 21) | (24 << 16), "bgezc", "TB" },
204   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (25 << 21) | (25 << 16), "bgezc", "TB" },
205   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (26 << 21) | (26 << 16), "bgezc", "TB" },
206   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (27 << 21) | (27 << 16), "bgezc", "TB" },
207   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (28 << 21) | (28 << 16), "bgezc", "TB" },
208   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (29 << 21) | (29 << 16), "bgezc", "TB" },
209   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (30 << 21) | (30 << 16), "bgezc", "TB" },
210   { kITypeMask | (0x3ff << 16), (22 << kOpcodeShift) | (31 << 21) | (31 << 16), "bgezc", "TB" },
211 
212   { kITypeMask, 22 << kOpcodeShift, "bgec", "STB" },
213 
214   { kITypeMask | (0x1f << 21), 23 << kOpcodeShift, "bgtzc", "TB" },
215 
216   // TODO: de-dup
217   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (1  << 21) | (1  << 16), "bltzc", "TB" },
218   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (2  << 21) | (2  << 16), "bltzc", "TB" },
219   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (3  << 21) | (3  << 16), "bltzc", "TB" },
220   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (4  << 21) | (4  << 16), "bltzc", "TB" },
221   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (5  << 21) | (5  << 16), "bltzc", "TB" },
222   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (6  << 21) | (6  << 16), "bltzc", "TB" },
223   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (7  << 21) | (7  << 16), "bltzc", "TB" },
224   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (8  << 21) | (8  << 16), "bltzc", "TB" },
225   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (9  << 21) | (9  << 16), "bltzc", "TB" },
226   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (10 << 21) | (10 << 16), "bltzc", "TB" },
227   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (11 << 21) | (11 << 16), "bltzc", "TB" },
228   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (12 << 21) | (12 << 16), "bltzc", "TB" },
229   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (13 << 21) | (13 << 16), "bltzc", "TB" },
230   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (14 << 21) | (14 << 16), "bltzc", "TB" },
231   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (15 << 21) | (15 << 16), "bltzc", "TB" },
232   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (16 << 21) | (16 << 16), "bltzc", "TB" },
233   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (17 << 21) | (17 << 16), "bltzc", "TB" },
234   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (18 << 21) | (18 << 16), "bltzc", "TB" },
235   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (19 << 21) | (19 << 16), "bltzc", "TB" },
236   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (20 << 21) | (20 << 16), "bltzc", "TB" },
237   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (21 << 21) | (21 << 16), "bltzc", "TB" },
238   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (22 << 21) | (22 << 16), "bltzc", "TB" },
239   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (23 << 21) | (23 << 16), "bltzc", "TB" },
240   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (24 << 21) | (24 << 16), "bltzc", "TB" },
241   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (25 << 21) | (25 << 16), "bltzc", "TB" },
242   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (26 << 21) | (26 << 16), "bltzc", "TB" },
243   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (27 << 21) | (27 << 16), "bltzc", "TB" },
244   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (28 << 21) | (28 << 16), "bltzc", "TB" },
245   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (29 << 21) | (29 << 16), "bltzc", "TB" },
246   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (30 << 21) | (30 << 16), "bltzc", "TB" },
247   { kITypeMask | (0x3ff << 16), (23 << kOpcodeShift) | (31 << 21) | (31 << 16), "bltzc", "TB" },
248 
249   { kITypeMask, 23 << kOpcodeShift, "bltc", "STB" },
250 
251   { kITypeMask, 24 << kOpcodeShift, "bnec", "STB" },
252 
253   { kITypeMask, 25 << kOpcodeShift, "daddiu", "TSi", },
254   { kITypeMask, 29 << kOpcodeShift, "daui", "TSi", },
255 
256   { kITypeMask, 32u << kOpcodeShift, "lb", "TO", },
257   { kITypeMask, 33u << kOpcodeShift, "lh", "TO", },
258   { kITypeMask, 35u << kOpcodeShift, "lw", "TO", },
259   { kITypeMask, 36u << kOpcodeShift, "lbu", "TO", },
260   { kITypeMask, 37u << kOpcodeShift, "lhu", "TO", },
261   { kITypeMask, 39u << kOpcodeShift, "lwu", "TO", },
262   { kITypeMask, 40u << kOpcodeShift, "sb", "TO", },
263   { kITypeMask, 41u << kOpcodeShift, "sh", "TO", },
264   { kITypeMask, 43u << kOpcodeShift, "sw", "TO", },
265   { kITypeMask, 49u << kOpcodeShift, "lwc1", "tO", },
266   { kITypeMask, 53u << kOpcodeShift, "ldc1", "tO", },
267   { kITypeMask | (0x1f << 21), 54u << kOpcodeShift, "jic", "Ti" },
268   { kITypeMask | (1 << 21), (54u << kOpcodeShift) | (1 << 21), "beqzc", "Sb" },  // TODO: de-dup?
269   { kITypeMask | (1 << 22), (54u << kOpcodeShift) | (1 << 22), "beqzc", "Sb" },
270   { kITypeMask | (1 << 23), (54u << kOpcodeShift) | (1 << 23), "beqzc", "Sb" },
271   { kITypeMask | (1 << 24), (54u << kOpcodeShift) | (1 << 24), "beqzc", "Sb" },
272   { kITypeMask | (1 << 25), (54u << kOpcodeShift) | (1 << 25), "beqzc", "Sb" },
273   { kITypeMask, 55u << kOpcodeShift, "ld", "TO", },
274   { kITypeMask, 57u << kOpcodeShift, "swc1", "tO", },
275   { kITypeMask | (0x1f << 16), (59u << kOpcodeShift) | (30 << 16), "auipc", "Si" },
276   { kITypeMask, 61u << kOpcodeShift, "sdc1", "tO", },
277   { kITypeMask | (0x1f << 21), 62u << kOpcodeShift, "jialc", "Ti" },
278   { kITypeMask | (1 << 21), (62u << kOpcodeShift) | (1 << 21), "bnezc", "Sb" },  // TODO: de-dup?
279   { kITypeMask | (1 << 22), (62u << kOpcodeShift) | (1 << 22), "bnezc", "Sb" },
280   { kITypeMask | (1 << 23), (62u << kOpcodeShift) | (1 << 23), "bnezc", "Sb" },
281   { kITypeMask | (1 << 24), (62u << kOpcodeShift) | (1 << 24), "bnezc", "Sb" },
282   { kITypeMask | (1 << 25), (62u << kOpcodeShift) | (1 << 25), "bnezc", "Sb" },
283   { kITypeMask, 63u << kOpcodeShift, "sd", "TO", },
284 
285   // Floating point.
286   { kFpMask | (0x1f << 21), kCop1 | (0x00 << 21), "mfc1", "Td" },
287   { kFpMask | (0x1f << 21), kCop1 | (0x01 << 21), "dmfc1", "Td" },
288   { kFpMask | (0x1f << 21), kCop1 | (0x03 << 21), "mfhc1", "Td" },
289   { kFpMask | (0x1f << 21), kCop1 | (0x04 << 21), "mtc1", "Td" },
290   { kFpMask | (0x1f << 21), kCop1 | (0x05 << 21), "dmtc1", "Td" },
291   { kFpMask | (0x1f << 21), kCop1 | (0x07 << 21), "mthc1", "Td" },
292   { kFpMask | (0x10 << 21), kCop1 | (0x10 << 21) | 0, "add", "fadt" },
293   { kFpMask | (0x10 << 21), kCop1 | (0x10 << 21) | 1, "sub", "fadt" },
294   { kFpMask | (0x10 << 21), kCop1 | (0x10 << 21) | 2, "mul", "fadt" },
295   { kFpMask | (0x10 << 21), kCop1 | (0x10 << 21) | 3, "div", "fadt" },
296   { kFpMask | (0x10 << 21), kCop1 | (0x10 << 21) | 4, "sqrt", "fad" },
297   { kFpMask | (0x21f << 16), kCop1 | (0x200 << 16) | 5, "abs", "fad" },
298   { kFpMask | (0x21f << 16), kCop1 | (0x200 << 16) | 6, "mov", "fad" },
299   { kFpMask | (0x21f << 16), kCop1 | (0x200 << 16) | 7, "neg", "fad" },
300   { kFpMask | (0x21f << 16), kCop1 | (0x200 << 16) | 8, "round.l", "fad" },
301   { kFpMask | (0x21f << 16), kCop1 | (0x200 << 16) | 9, "trunc.l", "fad" },
302   { kFpMask | (0x21f << 16), kCop1 | (0x200 << 16) | 10, "ceil.l", "fad" },
303   { kFpMask | (0x21f << 16), kCop1 | (0x200 << 16) | 11, "floor.l", "fad" },
304   { kFpMask | (0x21f << 16), kCop1 | (0x200 << 16) | 12, "round.w", "fad" },
305   { kFpMask | (0x21f << 16), kCop1 | (0x200 << 16) | 13, "trunc.w", "fad" },
306   { kFpMask | (0x21f << 16), kCop1 | (0x200 << 16) | 14, "ceil.w", "fad" },
307   { kFpMask | (0x21f << 16), kCop1 | (0x200 << 16) | 15, "floor.w", "fad" },
308   { kFpMask | (0x21f << 16), kCop1 | (0x200 << 16) | 32, "cvt.s", "fad" },
309   { kFpMask | (0x21f << 16), kCop1 | (0x200 << 16) | 33, "cvt.d", "fad" },
310   { kFpMask | (0x21f << 16), kCop1 | (0x200 << 16) | 36, "cvt.w", "fad" },
311   { kFpMask | (0x21f << 16), kCop1 | (0x200 << 16) | 37, "cvt.l", "fad" },
312   { kFpMask | (0x21f << 16), kCop1 | (0x200 << 16) | 38, "cvt.ps", "fad" },
313 };
314 
ReadU32(const uint8_t * ptr)315 static uint32_t ReadU32(const uint8_t* ptr) {
316   // We only support little-endian MIPS.
317   return ptr[0] | (ptr[1] << 8) | (ptr[2] << 16) | (ptr[3] << 24);
318 }
319 
Dump(std::ostream & os,const uint8_t * instr_ptr)320 size_t DisassemblerMips::Dump(std::ostream& os, const uint8_t* instr_ptr) {
321   uint32_t instruction = ReadU32(instr_ptr);
322 
323   uint32_t rs = (instruction >> 21) & 0x1f;  // I-type, R-type.
324   uint32_t rt = (instruction >> 16) & 0x1f;  // I-type, R-type.
325   uint32_t rd = (instruction >> 11) & 0x1f;  // R-type.
326   uint32_t sa = (instruction >>  6) & 0x1f;  // R-type.
327 
328   std::string opcode;
329   std::ostringstream args;
330 
331   // TODO: remove this!
332   uint32_t op = (instruction >> 26) & 0x3f;
333   uint32_t function = (instruction & 0x3f);  // R-type.
334   opcode = StringPrintf("op=%d fn=%d", op, function);
335 
336   for (size_t i = 0; i < arraysize(gMipsInstructions); ++i) {
337     if (gMipsInstructions[i].Matches(instruction)) {
338       opcode = gMipsInstructions[i].name;
339       for (const char* args_fmt = gMipsInstructions[i].args_fmt; *args_fmt; ++args_fmt) {
340         switch (*args_fmt) {
341           case 'A':  // sa (shift amount or [d]ext position).
342             args << sa;
343             break;
344           case 'B':  // Branch offset.
345             {
346               int32_t offset = static_cast<int16_t>(instruction & 0xffff);
347               offset <<= 2;
348               offset += 4;  // Delay slot.
349               args << FormatInstructionPointer(instr_ptr + offset)
350                    << StringPrintf("  ; %+d", offset);
351             }
352             break;
353           case 'b':  // 21-bit branch offset.
354             {
355               int32_t offset = (instruction & 0x1fffff) - ((instruction & 0x100000) << 1);
356               offset <<= 2;
357               offset += 4;  // Delay slot.
358               args << FormatInstructionPointer(instr_ptr + offset)
359                    << StringPrintf("  ; %+d", offset);
360             }
361             break;
362           case 'D': args << 'r' << rd; break;
363           case 'd': args << 'f' << rd; break;
364           case 'a': args << 'f' << sa; break;
365           case 'f':  // Floating point "fmt".
366             {
367               size_t fmt = (instruction >> 21) & 0x7;  // TODO: other fmts?
368               switch (fmt) {
369                 case 0: opcode += ".s"; break;
370                 case 1: opcode += ".d"; break;
371                 case 4: opcode += ".w"; break;
372                 case 5: opcode += ".l"; break;
373                 case 6: opcode += ".ps"; break;
374                 default: opcode += ".?"; break;
375               }
376               continue;  // No ", ".
377             }
378           case 'I':  // Upper 16-bit immediate.
379             args << reinterpret_cast<void*>((instruction & 0xffff) << 16);
380             break;
381           case 'i':  // Sign-extended lower 16-bit immediate.
382             args << static_cast<int16_t>(instruction & 0xffff);
383             break;
384           case 'L':  // Jump label.
385             {
386               // TODO: is this right?
387               uint32_t instr_index = (instruction & 0x1ffffff);
388               uint32_t target = (instr_index << 2);
389               target |= (reinterpret_cast<uintptr_t>(instr_ptr + 4) & 0xf0000000);
390               args << reinterpret_cast<void*>(target);
391             }
392             break;
393           case 'O':  // +x(rs)
394             {
395               int32_t offset = static_cast<int16_t>(instruction & 0xffff);
396               args << StringPrintf("%+d(r%d)", offset, rs);
397               if (rs == 17) {
398                 args << "  ; ";
399                 if (is64bit_) {
400                   Thread::DumpThreadOffset<8>(args, offset);
401                 } else {
402                   Thread::DumpThreadOffset<4>(args, offset);
403                 }
404               }
405             }
406             break;
407           case 'S': args << 'r' << rs; break;
408           case 's': args << 'f' << rs; break;
409           case 'T': args << 'r' << rt; break;
410           case 't': args << 'f' << rt; break;
411           case 'Z': args << rd; break;   // sz ([d]ext size).
412         }
413         if (*(args_fmt + 1)) {
414           args << ", ";
415         }
416       }
417       break;
418     }
419   }
420 
421   // Special cases for sequences of:
422   //   pc-relative +/- 2GB branch:
423   //     auipc  reg, imm
424   //     jic    reg, imm
425   //   pc-relative +/- 2GB branch and link:
426   //     auipc  reg, imm
427   //     daddiu reg, reg, imm
428   //     jialc  reg, 0
429   if (((op == 0x36 && rs == 0 && rt != 0) ||  // jic
430        (op == 0x19 && rs == rt && rt != 0)) &&  // daddiu
431       last_ptr_ && (intptr_t)instr_ptr - (intptr_t)last_ptr_ == 4 &&
432       (last_instr_ & 0xFC1F0000) == 0xEC1E0000 &&  // auipc
433       ((last_instr_ >> 21) & 0x1F) == rt) {
434     uint32_t offset = (last_instr_ << 16) | (instruction & 0xFFFF);
435     offset -= (offset & 0x8000) << 1;
436     offset -= 4;
437     if (op == 0x36) {
438       args << "  ; b ";
439     } else {
440       args << "  ; move r" << rt << ", ";
441     }
442     args << FormatInstructionPointer(instr_ptr + (int32_t)offset);
443     args << StringPrintf("  ; %+d", (int32_t)offset);
444   }
445 
446   os << FormatInstructionPointer(instr_ptr)
447      << StringPrintf(": %08x\t%-7s ", instruction, opcode.c_str())
448      << args.str() << '\n';
449   last_ptr_ = instr_ptr;
450   last_instr_ = instruction;
451   return 4;
452 }
453 
Dump(std::ostream & os,const uint8_t * begin,const uint8_t * end)454 void DisassemblerMips::Dump(std::ostream& os, const uint8_t* begin, const uint8_t* end) {
455   for (const uint8_t* cur = begin; cur < end; cur += 4) {
456     Dump(os, cur);
457   }
458 }
459 
460 }  // namespace mips
461 }  // namespace art
462