src/arm/decoder-arm.c (view raw)
1#include "decoder.h"
2
3#include "decoder-inlines.h"
4#include "emitter-arm.h"
5#include "isa-inlines.h"
6
7#define ADDR_MODE_1_SHIFT(OP) \
8 info->op3.reg = opcode & 0x0000000F; \
9 info->op3.shifterOp = ARM_SHIFT_ ## OP; \
10 info->op3.shifterImm = (opcode >> 7) & 0x1F; \
11 info->operandFormat |= ARM_OPERAND_REGISTER_3 | \
12 ARM_OPERAND_SHIFT_IMMEDIATE_3;
13
14#define ADDR_MODE_1_SHIFTR(OP) \
15 info->op3.reg = opcode & 0x0000000F; \
16 info->op3.shifterOp = ARM_SHIFT_ ## OP; \
17 info->op3.shifterReg = (opcode >> 8) & 0xF; \
18 ++info->iCycles; \
19 info->operandFormat |= ARM_OPERAND_REGISTER_3 | \
20 ARM_OPERAND_SHIFT_REGISTER_3;
21
22#define ADDR_MODE_1_LSL \
23 ADDR_MODE_1_SHIFT(LSL) \
24 if (!info->op3.shifterImm) { \
25 info->operandFormat &= ~ARM_OPERAND_SHIFT_REGISTER_3; \
26 info->op3.shifterOp = ARM_SHIFT_NONE; \
27 }
28
29#define ADDR_MODE_1_LSR ADDR_MODE_1_SHIFT(LSR)
30#define ADDR_MODE_1_ASR ADDR_MODE_1_SHIFT(ASR)
31#define ADDR_MODE_1_ROR \
32 ADDR_MODE_1_SHIFT(ROR) \
33 if (!info->op3.shifterImm) { \
34 info->op3.shifterOp = ARM_SHIFT_RRX; \
35 }
36
37#define ADDR_MODE_1_LSLR ADDR_MODE_1_SHIFTR(LSL)
38#define ADDR_MODE_1_LSRR ADDR_MODE_1_SHIFTR(LSR)
39#define ADDR_MODE_1_ASRR ADDR_MODE_1_SHIFTR(ASR)
40#define ADDR_MODE_1_RORR ADDR_MODE_1_SHIFTR(ROR)
41
42#define ADDR_MODE_1_IMM \
43 int rotate = (opcode & 0x00000F00) >> 7; \
44 int immediate = opcode & 0x000000FF; \
45 info->op3.immediate = ARM_ROR(immediate, rotate); \
46 info->operandFormat |= ARM_OPERAND_IMMEDIATE_3;
47
48#define ADDR_MODE_2_SHIFT(OP) \
49 info->memory.format |= ARM_MEMORY_REGISTER_OFFSET | ARM_MEMORY_SHIFTED_OFFSET; \
50 info->memory.offset.shifterOp = ARM_SHIFT_ ## OP; \
51 info->memory.offset.shifterImm = (opcode >> 7) & 0x1F; \
52 info->memory.offset.reg = opcode & 0x0000000F;
53
54#define ADDR_MODE_2_LSL \
55 ADDR_MODE_2_SHIFT(LSL) \
56 if (!info->memory.offset.shifterImm) { \
57 info->memory.format &= ~ARM_MEMORY_SHIFTED_OFFSET; \
58 info->memory.offset.shifterOp = ARM_SHIFT_NONE; \
59 }
60
61#define ADDR_MODE_2_LSR ADDR_MODE_2_SHIFT(LSR) \
62 if (!info->memory.offset.shifterImm) { \
63 info->memory.offset.shifterImm = 32; \
64 }
65
66#define ADDR_MODE_2_ASR ADDR_MODE_2_SHIFT(ASR) \
67 if (!info->memory.offset.shifterImm) { \
68 info->memory.offset.shifterImm = 32; \
69 }
70
71#define ADDR_MODE_2_ROR \
72 ADDR_MODE_2_SHIFT(ROR) \
73 if (!info->memory.offset.shifterImm) { \
74 info->memory.offset.shifterOp = ARM_SHIFT_RRX; \
75 }
76
77#define ADDR_MODE_2_IMM \
78 info->memory.format |= ARM_MEMORY_IMMEDIATE_OFFSET; \
79 info->memory.offset.immediate = opcode & 0x00000FFF;
80
81#define ADDR_MODE_3_REG \
82 info->memory.format |= ARM_MEMORY_REGISTER_OFFSET; \
83 info->memory.offset.reg = opcode & 0x0000000F;
84
85#define ADDR_MODE_3_IMM \
86 info->memory.format |= ARM_MEMORY_IMMEDIATE_OFFSET; \
87 info->memory.offset.immediate = (opcode & 0x0000000F) | ((opcode & 0x00000F00) >> 4);
88
89#define DEFINE_DECODER_ARM(NAME, MNEMONIC, BODY) \
90 static void _ARMDecode ## NAME (uint32_t opcode, struct ARMInstructionInfo* info) { \
91 UNUSED(opcode); \
92 info->mnemonic = ARM_MN_ ## MNEMONIC; \
93 BODY; \
94 }
95
96#define DEFINE_ALU_DECODER_EX_ARM(NAME, MNEMONIC, S, SHIFTER, OTHER_AFFECTED, SKIPPED) \
97 DEFINE_DECODER_ARM(NAME, MNEMONIC, \
98 info->op1.reg = (opcode >> 12) & 0xF; \
99 info->op2.reg = (opcode >> 16) & 0xF; \
100 info->operandFormat = ARM_OPERAND_REGISTER_1 | \
101 OTHER_AFFECTED | \
102 ARM_OPERAND_REGISTER_2; \
103 info->affectsCPSR = S; \
104 SHIFTER; \
105 if (SKIPPED == 1) { \
106 info->operandFormat >>= 8; \
107 info->op1 = info->op2; \
108 info->op2 = info->op3; \
109 } else if (SKIPPED == 2) { \
110 info->operandFormat &= ~ARM_OPERAND_2; \
111 } \
112 if (info->op1.reg == ARM_PC) { \
113 info->branches = 1; \
114 })
115
116#define DEFINE_ALU_DECODER_ARM(NAME, SKIPPED) \
117 DEFINE_ALU_DECODER_EX_ARM(NAME ## _LSL, NAME, 0, ADDR_MODE_1_LSL, ARM_OPERAND_AFFECTED_1, SKIPPED) \
118 DEFINE_ALU_DECODER_EX_ARM(NAME ## S_LSL, NAME, 1, ADDR_MODE_1_LSL, ARM_OPERAND_AFFECTED_1, SKIPPED) \
119 DEFINE_ALU_DECODER_EX_ARM(NAME ## _LSLR, NAME, 0, ADDR_MODE_1_LSLR, ARM_OPERAND_AFFECTED_1, SKIPPED) \
120 DEFINE_ALU_DECODER_EX_ARM(NAME ## S_LSLR, NAME, 1, ADDR_MODE_1_LSLR, ARM_OPERAND_AFFECTED_1, SKIPPED) \
121 DEFINE_ALU_DECODER_EX_ARM(NAME ## _LSR, NAME, 0, ADDR_MODE_1_LSR, ARM_OPERAND_AFFECTED_1, SKIPPED) \
122 DEFINE_ALU_DECODER_EX_ARM(NAME ## S_LSR, NAME, 1, ADDR_MODE_1_LSR, ARM_OPERAND_AFFECTED_1, SKIPPED) \
123 DEFINE_ALU_DECODER_EX_ARM(NAME ## _LSRR, NAME, 0, ADDR_MODE_1_LSRR, ARM_OPERAND_AFFECTED_1, SKIPPED) \
124 DEFINE_ALU_DECODER_EX_ARM(NAME ## S_LSRR, NAME, 1, ADDR_MODE_1_LSRR, ARM_OPERAND_AFFECTED_1, SKIPPED) \
125 DEFINE_ALU_DECODER_EX_ARM(NAME ## _ASR, NAME, 0, ADDR_MODE_1_ASR, ARM_OPERAND_AFFECTED_1, SKIPPED) \
126 DEFINE_ALU_DECODER_EX_ARM(NAME ## S_ASR, NAME, 1, ADDR_MODE_1_ASR, ARM_OPERAND_AFFECTED_1, SKIPPED) \
127 DEFINE_ALU_DECODER_EX_ARM(NAME ## _ASRR, NAME, 0, ADDR_MODE_1_ASRR, ARM_OPERAND_AFFECTED_1, SKIPPED) \
128 DEFINE_ALU_DECODER_EX_ARM(NAME ## S_ASRR, NAME, 1, ADDR_MODE_1_ASRR, ARM_OPERAND_AFFECTED_1, SKIPPED) \
129 DEFINE_ALU_DECODER_EX_ARM(NAME ## _ROR, NAME, 0, ADDR_MODE_1_ROR, ARM_OPERAND_AFFECTED_1, SKIPPED) \
130 DEFINE_ALU_DECODER_EX_ARM(NAME ## S_ROR, NAME, 1, ADDR_MODE_1_ROR, ARM_OPERAND_AFFECTED_1, SKIPPED) \
131 DEFINE_ALU_DECODER_EX_ARM(NAME ## _RORR, NAME, 0, ADDR_MODE_1_RORR, ARM_OPERAND_AFFECTED_1, SKIPPED) \
132 DEFINE_ALU_DECODER_EX_ARM(NAME ## S_RORR, NAME, 1, ADDR_MODE_1_RORR, ARM_OPERAND_AFFECTED_1, SKIPPED) \
133 DEFINE_ALU_DECODER_EX_ARM(NAME ## I, NAME, 0, ADDR_MODE_1_IMM, ARM_OPERAND_AFFECTED_1, SKIPPED) \
134 DEFINE_ALU_DECODER_EX_ARM(NAME ## SI, NAME, 1, ADDR_MODE_1_IMM, ARM_OPERAND_AFFECTED_1, SKIPPED)
135
136#define DEFINE_ALU_DECODER_S_ONLY_ARM(NAME) \
137 DEFINE_ALU_DECODER_EX_ARM(NAME ## _LSL, NAME, 1, ADDR_MODE_1_LSL, ARM_OPERAND_NONE, 1) \
138 DEFINE_ALU_DECODER_EX_ARM(NAME ## _LSLR, NAME, 1, ADDR_MODE_1_LSLR, ARM_OPERAND_NONE, 1) \
139 DEFINE_ALU_DECODER_EX_ARM(NAME ## _LSR, NAME, 1, ADDR_MODE_1_LSR, ARM_OPERAND_NONE, 1) \
140 DEFINE_ALU_DECODER_EX_ARM(NAME ## _LSRR, NAME, 1, ADDR_MODE_1_LSRR, ARM_OPERAND_NONE, 1) \
141 DEFINE_ALU_DECODER_EX_ARM(NAME ## _ASR, NAME, 1, ADDR_MODE_1_ASR, ARM_OPERAND_NONE, 1) \
142 DEFINE_ALU_DECODER_EX_ARM(NAME ## _ASRR, NAME, 1, ADDR_MODE_1_ASRR, ARM_OPERAND_NONE, 1) \
143 DEFINE_ALU_DECODER_EX_ARM(NAME ## _ROR, NAME, 1, ADDR_MODE_1_ROR, ARM_OPERAND_NONE, 1) \
144 DEFINE_ALU_DECODER_EX_ARM(NAME ## _RORR, NAME, 1, ADDR_MODE_1_RORR, ARM_OPERAND_NONE, 1) \
145 DEFINE_ALU_DECODER_EX_ARM(NAME ## I, NAME, 1, ADDR_MODE_1_IMM, ARM_OPERAND_NONE, 1)
146
147#define DEFINE_MULTIPLY_DECODER_EX_ARM(NAME, MNEMONIC, S, OTHER_AFFECTED) \
148 DEFINE_DECODER_ARM(NAME, MNEMONIC, \
149 info->op1.reg = (opcode >> 16) & 0xF; \
150 info->op2.reg = opcode & 0xF; \
151 info->op3.reg = (opcode >> 8) & 0xF; \
152 info->op4.reg = (opcode >> 12) & 0xF; \
153 info->operandFormat = ARM_OPERAND_REGISTER_1 | \
154 ARM_OPERAND_AFFECTED_1 | \
155 ARM_OPERAND_REGISTER_2 | \
156 ARM_OPERAND_REGISTER_3 | \
157 OTHER_AFFECTED; \
158 info->affectsCPSR = S; \
159 if (info->op1.reg == ARM_PC) { \
160 info->branches = 1; \
161 })
162
163#define DEFINE_LONG_MULTIPLY_DECODER_EX_ARM(NAME, MNEMONIC, S) \
164 DEFINE_DECODER_ARM(NAME, MNEMONIC, \
165 info->op1.reg = (opcode >> 12) & 0xF; \
166 info->op2.reg = (opcode >> 16) & 0xF; \
167 info->op3.reg = opcode & 0xF; \
168 info->op4.reg = (opcode >> 8) & 0xF; \
169 info->operandFormat = ARM_OPERAND_REGISTER_1 | \
170 ARM_OPERAND_AFFECTED_1 | \
171 ARM_OPERAND_REGISTER_2 | \
172 ARM_OPERAND_AFFECTED_2 | \
173 ARM_OPERAND_REGISTER_3 | \
174 ARM_OPERAND_REGISTER_4; \
175 info->affectsCPSR = S; \
176 if (info->op1.reg == ARM_PC) { \
177 info->branches = 1; \
178 })
179
180#define DEFINE_MULTIPLY_DECODER_ARM(NAME, OTHER_AFFECTED) \
181 DEFINE_MULTIPLY_DECODER_EX_ARM(NAME, NAME, 0, OTHER_AFFECTED) \
182 DEFINE_MULTIPLY_DECODER_EX_ARM(NAME ## S, NAME, 1, OTHER_AFFECTED)
183
184#define DEFINE_LONG_MULTIPLY_DECODER_ARM(NAME) \
185 DEFINE_LONG_MULTIPLY_DECODER_EX_ARM(NAME, NAME, 0) \
186 DEFINE_LONG_MULTIPLY_DECODER_EX_ARM(NAME ## S, NAME, 1)
187
188#define DEFINE_LOAD_STORE_DECODER_EX_ARM(NAME, MNEMONIC, ADDRESSING_MODE, ADDRESSING_DECODING, CYCLES, TYPE) \
189 DEFINE_DECODER_ARM(NAME, MNEMONIC, \
190 info->op1.reg = (opcode >> 12) & 0xF; \
191 info->memory.baseReg = (opcode >> 16) & 0xF; \
192 info->memory.width = TYPE; \
193 info->operandFormat = ARM_OPERAND_REGISTER_1 | \
194 ARM_OPERAND_AFFECTED_1 | /* TODO: Remove this for STR */ \
195 ARM_OPERAND_MEMORY_2; \
196 info->memory.format = ARM_MEMORY_REGISTER_BASE | ADDRESSING_MODE; \
197 ADDRESSING_DECODING; \
198 CYCLES;)
199
200#define DEFINE_LOAD_STORE_DECODER_SET_ARM(NAME, MNEMONIC, ADDRESSING_MODE, CYCLES, TYPE) \
201 DEFINE_LOAD_STORE_DECODER_EX_ARM(NAME, MNEMONIC, \
202 ARM_MEMORY_POST_INCREMENT | \
203 ARM_MEMORY_WRITEBACK | \
204 ARM_MEMORY_OFFSET_SUBTRACT, \
205 ADDRESSING_MODE, CYCLES, TYPE) \
206 DEFINE_LOAD_STORE_DECODER_EX_ARM(NAME ## U, MNEMONIC, \
207 ARM_MEMORY_POST_INCREMENT | \
208 ARM_MEMORY_WRITEBACK, \
209 ADDRESSING_MODE, CYCLES, TYPE) \
210 DEFINE_LOAD_STORE_DECODER_EX_ARM(NAME ## P, MNEMONIC, \
211 ARM_MEMORY_PRE_INCREMENT | \
212 ARM_MEMORY_OFFSET_SUBTRACT, \
213 ADDRESSING_MODE, CYCLES, TYPE) \
214 DEFINE_LOAD_STORE_DECODER_EX_ARM(NAME ## PW, MNEMONIC, \
215 ARM_MEMORY_PRE_INCREMENT | \
216 ARM_MEMORY_WRITEBACK | \
217 ARM_MEMORY_OFFSET_SUBTRACT, \
218 ADDRESSING_MODE, CYCLES, TYPE) \
219 DEFINE_LOAD_STORE_DECODER_EX_ARM(NAME ## PU, MNEMONIC, \
220 ARM_MEMORY_PRE_INCREMENT, \
221 ADDRESSING_MODE, CYCLES, TYPE) \
222 DEFINE_LOAD_STORE_DECODER_EX_ARM(NAME ## PUW, MNEMONIC, \
223 ARM_MEMORY_PRE_INCREMENT | \
224 ARM_MEMORY_WRITEBACK, \
225 ADDRESSING_MODE, CYCLES, TYPE)
226
227#define DEFINE_LOAD_STORE_MODE_2_DECODER_ARM(NAME, MNEMONIC, CYCLES, TYPE) \
228 DEFINE_LOAD_STORE_DECODER_SET_ARM(NAME ## _LSL_, MNEMONIC, ADDR_MODE_2_LSL, CYCLES, TYPE) \
229 DEFINE_LOAD_STORE_DECODER_SET_ARM(NAME ## _LSR_, MNEMONIC, ADDR_MODE_2_LSR, CYCLES, TYPE) \
230 DEFINE_LOAD_STORE_DECODER_SET_ARM(NAME ## _ASR_, MNEMONIC, ADDR_MODE_2_ASR, CYCLES, TYPE) \
231 DEFINE_LOAD_STORE_DECODER_SET_ARM(NAME ## _ROR_, MNEMONIC, ADDR_MODE_2_ROR, CYCLES, TYPE) \
232 DEFINE_LOAD_STORE_DECODER_SET_ARM(NAME ## I, MNEMONIC, ADDR_MODE_2_IMM, CYCLES, TYPE)
233
234#define DEFINE_LOAD_STORE_MODE_3_DECODER_ARM(NAME, MNEMONIC, CYCLES, TYPE) \
235 DEFINE_LOAD_STORE_DECODER_SET_ARM(NAME, MNEMONIC, ADDR_MODE_3_REG, CYCLES, TYPE) \
236 DEFINE_LOAD_STORE_DECODER_SET_ARM(NAME ## I, MNEMONIC, ADDR_MODE_3_IMM, CYCLES, TYPE)
237
238#define DEFINE_LOAD_STORE_T_DECODER_SET_ARM(NAME, MNEMONIC, ADDRESSING_MODE, CYCLES, TYPE) \
239 DEFINE_LOAD_STORE_DECODER_EX_ARM(NAME, MNEMONIC, \
240 ARM_MEMORY_POST_INCREMENT | \
241 ARM_MEMORY_OFFSET_SUBTRACT, \
242 ADDRESSING_MODE, CYCLES, TYPE) \
243 DEFINE_LOAD_STORE_DECODER_EX_ARM(NAME ## U, MNEMONIC, \
244 ARM_MEMORY_POST_INCREMENT, \
245 ADDRESSING_MODE, CYCLES, TYPE)
246
247#define DEFINE_LOAD_STORE_T_DECODER_ARM(NAME, MNEMONIC, CYCLES, TYPE) \
248 DEFINE_LOAD_STORE_T_DECODER_SET_ARM(NAME ## _LSL_, MNEMONIC, ADDR_MODE_2_LSL, CYCLES, TYPE) \
249 DEFINE_LOAD_STORE_T_DECODER_SET_ARM(NAME ## _LSR_, MNEMONIC, ADDR_MODE_2_LSR, CYCLES, TYPE) \
250 DEFINE_LOAD_STORE_T_DECODER_SET_ARM(NAME ## _ASR_, MNEMONIC, ADDR_MODE_2_ASR, CYCLES, TYPE) \
251 DEFINE_LOAD_STORE_T_DECODER_SET_ARM(NAME ## _ROR_, MNEMONIC, ADDR_MODE_2_ROR, CYCLES, TYPE) \
252 DEFINE_LOAD_STORE_T_DECODER_SET_ARM(NAME ## I, MNEMONIC, ADDR_MODE_2_IMM, CYCLES, TYPE)
253
254#define DEFINE_LOAD_STORE_MULTIPLE_DECODER_EX_ARM(NAME, MNEMONIC, DIRECTION, WRITEBACK) \
255 DEFINE_DECODER_ARM(NAME, MNEMONIC, \
256 info->memory.baseReg = (opcode >> 16) & 0xF; \
257 info->op1.immediate = opcode & 0x0000FFFF; \
258 info->branches = info->op1.immediate & (1 << ARM_PC); \
259 info->operandFormat = ARM_OPERAND_MEMORY_1; \
260 info->memory.format = ARM_MEMORY_REGISTER_BASE | \
261 ARM_MEMORY_WRITEBACK | \
262 ARM_MEMORY_ ## DIRECTION;)
263
264
265#define DEFINE_LOAD_STORE_MULTIPLE_DECODER_ARM(NAME) \
266 DEFINE_LOAD_STORE_MULTIPLE_DECODER_EX_ARM(NAME ## DA, NAME, DECREMENT_AFTER, 0) \
267 DEFINE_LOAD_STORE_MULTIPLE_DECODER_EX_ARM(NAME ## DAW, NAME, DECREMENT_AFTER, ARM_MEMORY_WRITEBACK) \
268 DEFINE_LOAD_STORE_MULTIPLE_DECODER_EX_ARM(NAME ## DB, NAME, DECREMENT_BEFORE, 0) \
269 DEFINE_LOAD_STORE_MULTIPLE_DECODER_EX_ARM(NAME ## DBW, NAME, DECREMENT_BEFORE, ARM_MEMORY_WRITEBACK) \
270 DEFINE_LOAD_STORE_MULTIPLE_DECODER_EX_ARM(NAME ## IA, NAME, INCREMENT_AFTER, 0) \
271 DEFINE_LOAD_STORE_MULTIPLE_DECODER_EX_ARM(NAME ## IAW, NAME, INCREMENT_AFTER, ARM_MEMORY_WRITEBACK) \
272 DEFINE_LOAD_STORE_MULTIPLE_DECODER_EX_ARM(NAME ## IB, NAME, INCREMENT_BEFORE, 0) \
273 DEFINE_LOAD_STORE_MULTIPLE_DECODER_EX_ARM(NAME ## IBW, NAME, INCREMENT_BEFORE, ARM_MEMORY_WRITEBACK) \
274 DEFINE_LOAD_STORE_MULTIPLE_DECODER_EX_ARM(NAME ## SDA, NAME, DECREMENT_AFTER, 0) \
275 DEFINE_LOAD_STORE_MULTIPLE_DECODER_EX_ARM(NAME ## SDAW, NAME, DECREMENT_AFTER, ARM_MEMORY_WRITEBACK) \
276 DEFINE_LOAD_STORE_MULTIPLE_DECODER_EX_ARM(NAME ## SDB, NAME, DECREMENT_BEFORE, 0) \
277 DEFINE_LOAD_STORE_MULTIPLE_DECODER_EX_ARM(NAME ## SDBW, NAME, DECREMENT_BEFORE, ARM_MEMORY_WRITEBACK) \
278 DEFINE_LOAD_STORE_MULTIPLE_DECODER_EX_ARM(NAME ## SIA, NAME, INCREMENT_AFTER, 0) \
279 DEFINE_LOAD_STORE_MULTIPLE_DECODER_EX_ARM(NAME ## SIAW, NAME, INCREMENT_AFTER, ARM_MEMORY_WRITEBACK) \
280 DEFINE_LOAD_STORE_MULTIPLE_DECODER_EX_ARM(NAME ## SIB, NAME, INCREMENT_BEFORE, 0) \
281 DEFINE_LOAD_STORE_MULTIPLE_DECODER_EX_ARM(NAME ## SIBW, NAME, INCREMENT_BEFORE, ARM_MEMORY_WRITEBACK)
282
283#define DEFINE_SWP_DECODER_ARM(NAME, TYPE) \
284 DEFINE_DECODER_ARM(NAME, SWP, \
285 info->memory.baseReg = (opcode >> 16) & 0xF; \
286 info->op1.reg = (opcode >> 12) & 0xF; \
287 info->op2.reg = opcode & 0xF; \
288 info->operandFormat = ARM_OPERAND_REGISTER_1 | \
289 ARM_OPERAND_AFFECTED_1 | \
290 ARM_OPERAND_REGISTER_2 | \
291 ARM_OPERAND_MEMORY_3; \
292 info->memory.format = ARM_MEMORY_REGISTER_BASE; \
293 info->memory.width = TYPE;)
294
295DEFINE_ALU_DECODER_ARM(ADD, 0)
296DEFINE_ALU_DECODER_ARM(ADC, 0)
297DEFINE_ALU_DECODER_ARM(AND, 0)
298DEFINE_ALU_DECODER_ARM(BIC, 0)
299DEFINE_ALU_DECODER_S_ONLY_ARM(CMN)
300DEFINE_ALU_DECODER_S_ONLY_ARM(CMP)
301DEFINE_ALU_DECODER_ARM(EOR, 0)
302DEFINE_ALU_DECODER_ARM(MOV, 2)
303DEFINE_ALU_DECODER_ARM(MVN, 2)
304DEFINE_ALU_DECODER_ARM(ORR, 0)
305DEFINE_ALU_DECODER_ARM(RSB, 0)
306DEFINE_ALU_DECODER_ARM(RSC, 0)
307DEFINE_ALU_DECODER_ARM(SBC, 0)
308DEFINE_ALU_DECODER_ARM(SUB, 0)
309DEFINE_ALU_DECODER_S_ONLY_ARM(TEQ)
310DEFINE_ALU_DECODER_S_ONLY_ARM(TST)
311
312// TOOD: Estimate cycles
313DEFINE_MULTIPLY_DECODER_ARM(MLA, ARM_OPERAND_REGISTER_4)
314DEFINE_MULTIPLY_DECODER_ARM(MUL, ARM_OPERAND_NONE)
315
316DEFINE_LONG_MULTIPLY_DECODER_ARM(SMLAL)
317DEFINE_LONG_MULTIPLY_DECODER_ARM(SMULL)
318DEFINE_LONG_MULTIPLY_DECODER_ARM(UMLAL)
319DEFINE_LONG_MULTIPLY_DECODER_ARM(UMULL)
320
321// Begin load/store definitions
322
323DEFINE_LOAD_STORE_MODE_2_DECODER_ARM(LDR, LDR, LOAD_CYCLES, ARM_ACCESS_WORD)
324DEFINE_LOAD_STORE_MODE_2_DECODER_ARM(LDRB, LDR, LOAD_CYCLES, ARM_ACCESS_BYTE)
325DEFINE_LOAD_STORE_MODE_3_DECODER_ARM(LDRH, LDR, LOAD_CYCLES, ARM_ACCESS_HALFWORD)
326DEFINE_LOAD_STORE_MODE_3_DECODER_ARM(LDRSB, LDR, LOAD_CYCLES, ARM_ACCESS_SIGNED_BYTE)
327DEFINE_LOAD_STORE_MODE_3_DECODER_ARM(LDRSH, LDR, LOAD_CYCLES, ARM_ACCESS_SIGNED_HALFWORD)
328DEFINE_LOAD_STORE_MODE_2_DECODER_ARM(STR, STR, STORE_CYCLES, ARM_ACCESS_WORD)
329DEFINE_LOAD_STORE_MODE_2_DECODER_ARM(STRB, STR, STORE_CYCLES, ARM_ACCESS_BYTE)
330DEFINE_LOAD_STORE_MODE_3_DECODER_ARM(STRH, STR, STORE_CYCLES, ARM_ACCESS_HALFWORD)
331
332DEFINE_LOAD_STORE_T_DECODER_ARM(LDRBT, LDR, LOAD_CYCLES, ARM_ACCESS_TRANSLATED_BYTE)
333DEFINE_LOAD_STORE_T_DECODER_ARM(LDRT, LDR, LOAD_CYCLES, ARM_ACCESS_TRANSLATED_WORD)
334DEFINE_LOAD_STORE_T_DECODER_ARM(STRBT, STR, STORE_CYCLES, ARM_ACCESS_TRANSLATED_BYTE)
335DEFINE_LOAD_STORE_T_DECODER_ARM(STRT, STR, STORE_CYCLES, ARM_ACCESS_TRANSLATED_WORD)
336
337DEFINE_LOAD_STORE_MULTIPLE_DECODER_ARM(LDM)
338DEFINE_LOAD_STORE_MULTIPLE_DECODER_ARM(STM)
339
340DEFINE_SWP_DECODER_ARM(SWP, ARM_ACCESS_WORD)
341DEFINE_SWP_DECODER_ARM(SWPB, ARM_ACCESS_BYTE)
342
343// End load/store definitions
344
345// Begin branch definitions
346
347DEFINE_DECODER_ARM(B, B,
348 int32_t offset = opcode << 8;
349 info->op1.immediate = offset >> 6;
350 info->operandFormat = ARM_OPERAND_IMMEDIATE_1;
351 info->branches = 1;)
352
353DEFINE_DECODER_ARM(BL, BL,
354 int32_t offset = opcode << 8;
355 info->op1.immediate = offset >> 6;
356 info->operandFormat = ARM_OPERAND_IMMEDIATE_1;
357 info->branches = 1;)
358
359DEFINE_DECODER_ARM(BX, BX,
360 info->op1.reg = opcode & 0x0000000F;
361 info->operandFormat = ARM_OPERAND_REGISTER_1;
362 info->branches = 1;)
363
364// End branch definitions
365
366// Begin coprocessor definitions
367
368DEFINE_DECODER_ARM(CDP, ILL, info->operandFormat = ARM_OPERAND_NONE;)
369DEFINE_DECODER_ARM(LDC, ILL, info->operandFormat = ARM_OPERAND_NONE;)
370DEFINE_DECODER_ARM(STC, ILL, info->operandFormat = ARM_OPERAND_NONE;)
371DEFINE_DECODER_ARM(MCR, ILL, info->operandFormat = ARM_OPERAND_NONE;)
372DEFINE_DECODER_ARM(MRC, ILL, info->operandFormat = ARM_OPERAND_NONE;)
373
374// Begin miscellaneous definitions
375
376DEFINE_DECODER_ARM(BKPT, BKPT, info->operandFormat = ARM_OPERAND_NONE;) // Not strictly in ARMv4T, but here for convenience
377DEFINE_DECODER_ARM(ILL, ILL, info->operandFormat = ARM_OPERAND_NONE;) // Illegal opcode
378
379DEFINE_DECODER_ARM(MSR, MSR,
380 info->affectsCPSR = 1;
381 info->op1.reg = ARM_CPSR;
382 info->op2.reg = opcode & 0x0000000F;
383 info->operandFormat = ARM_OPERAND_REGISTER_1 |
384 ARM_OPERAND_AFFECTED_1 |
385 ARM_OPERAND_REGISTER_2;)
386
387DEFINE_DECODER_ARM(MSRR, MSR,
388 info->op1.reg = ARM_SPSR;
389 info->op2.reg = opcode & 0x0000000F;
390 info->operandFormat = ARM_OPERAND_REGISTER_1 |
391 ARM_OPERAND_AFFECTED_1 |
392 ARM_OPERAND_REGISTER_2;)
393
394DEFINE_DECODER_ARM(MRS, MRS, info->affectsCPSR = 1;
395 info->affectsCPSR = 1;
396 info->op1.reg = (opcode >> 12) & 0xF;
397 info->op2.reg = ARM_CPSR;
398 info->operandFormat = ARM_OPERAND_REGISTER_1 |
399 ARM_OPERAND_AFFECTED_1 |
400 ARM_OPERAND_REGISTER_2;)
401
402DEFINE_DECODER_ARM(MRSR, MRS, info->affectsCPSR = 1;
403 info->affectsCPSR = 1;
404 info->op1.reg = (opcode >> 12) & 0xF;
405 info->op2.reg = ARM_SPSR;
406 info->operandFormat = ARM_OPERAND_REGISTER_1 |
407 ARM_OPERAND_AFFECTED_1 |
408 ARM_OPERAND_REGISTER_2;)
409
410DEFINE_DECODER_ARM(MSRI, MSR, info->affectsCPSR = 1;
411 int rotate = (opcode & 0x00000F00) >> 7;
412 int32_t operand = ARM_ROR(opcode & 0x000000FF, rotate);
413 info->affectsCPSR = 1;
414 info->op1.reg = ARM_CPSR;
415 info->op2.immediate = operand;
416 info->operandFormat = ARM_OPERAND_REGISTER_1 |
417 ARM_OPERAND_AFFECTED_1 |
418 ARM_OPERAND_IMMEDIATE_2;)
419
420DEFINE_DECODER_ARM(MSRRI, MSR, info->affectsCPSR = 1;
421 int rotate = (opcode & 0x00000F00) >> 7;
422 int32_t operand = ARM_ROR(opcode & 0x000000FF, rotate);
423 info->affectsCPSR = 1;
424 info->op1.reg = ARM_SPSR;
425 info->op2.immediate = operand;
426 info->operandFormat = ARM_OPERAND_REGISTER_1 |
427 ARM_OPERAND_AFFECTED_1 |
428 ARM_OPERAND_IMMEDIATE_2;)
429
430DEFINE_DECODER_ARM(SWI, SWI,
431 info->op1.immediate = opcode & 0xFFFFFF;
432 info->operandFormat = ARM_OPERAND_IMMEDIATE_1;
433 info->traps = 1;)
434
435typedef void (*ARMDecoder)(uint32_t opcode, struct ARMInstructionInfo* info);
436
437static const ARMDecoder _armDecoderTable[0x1000] = {
438 DECLARE_ARM_EMITTER_BLOCK(_ARMDecode)
439};
440
441void ARMDecodeARM(uint32_t opcode, struct ARMInstructionInfo* info) {
442 info->execMode = MODE_ARM;
443 info->opcode = opcode;
444 info->branches = 0;
445 info->traps = 0;
446 info->affectsCPSR = 0;
447 info->condition = opcode >> 28;
448 info->sDataCycles = 0;
449 info->nDataCycles = 0;
450 info->sInstructionCycles = 1;
451 info->nInstructionCycles = 0;
452 info->iCycles = 0;
453 info->cCycles = 0;
454 ARMDecoder decoder = _armDecoderTable[((opcode >> 16) & 0xFF0) | ((opcode >> 4) & 0x00F)];
455 decoder(opcode, info);
456}