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a06ea964 | 1 | /* aarch64-dis.c -- AArch64 disassembler. |
6f2750fe | 2 | Copyright (C) 2009-2016 Free Software Foundation, Inc. |
a06ea964 NC |
3 | Contributed by ARM Ltd. |
4 | ||
5 | This file is part of the GNU opcodes library. | |
6 | ||
7 | This library is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3, or (at your option) | |
10 | any later version. | |
11 | ||
12 | It is distributed in the hope that it will be useful, but WITHOUT | |
13 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
15 | License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; see the file COPYING3. If not, | |
19 | see <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include "sysdep.h" | |
22 | #include "bfd_stdint.h" | |
23 | #include "dis-asm.h" | |
24 | #include "libiberty.h" | |
25 | #include "opintl.h" | |
26 | #include "aarch64-dis.h" | |
a06ea964 | 27 | #include "elf-bfd.h" |
a06ea964 NC |
28 | |
29 | #define ERR_OK 0 | |
30 | #define ERR_UND -1 | |
31 | #define ERR_UNP -3 | |
32 | #define ERR_NYI -5 | |
33 | ||
34 | #define INSNLEN 4 | |
35 | ||
36 | /* Cached mapping symbol state. */ | |
37 | enum map_type | |
38 | { | |
39 | MAP_INSN, | |
40 | MAP_DATA | |
41 | }; | |
42 | ||
43 | static enum map_type last_type; | |
44 | static int last_mapping_sym = -1; | |
45 | static bfd_vma last_mapping_addr = 0; | |
46 | ||
47 | /* Other options */ | |
48 | static int no_aliases = 0; /* If set disassemble as most general inst. */ | |
49 | \f | |
50 | ||
51 | static void | |
52 | set_default_aarch64_dis_options (struct disassemble_info *info ATTRIBUTE_UNUSED) | |
53 | { | |
54 | } | |
55 | ||
56 | static void | |
57 | parse_aarch64_dis_option (const char *option, unsigned int len ATTRIBUTE_UNUSED) | |
58 | { | |
59 | /* Try to match options that are simple flags */ | |
60 | if (CONST_STRNEQ (option, "no-aliases")) | |
61 | { | |
62 | no_aliases = 1; | |
63 | return; | |
64 | } | |
65 | ||
66 | if (CONST_STRNEQ (option, "aliases")) | |
67 | { | |
68 | no_aliases = 0; | |
69 | return; | |
70 | } | |
71 | ||
72 | #ifdef DEBUG_AARCH64 | |
73 | if (CONST_STRNEQ (option, "debug_dump")) | |
74 | { | |
75 | debug_dump = 1; | |
76 | return; | |
77 | } | |
78 | #endif /* DEBUG_AARCH64 */ | |
79 | ||
80 | /* Invalid option. */ | |
81 | fprintf (stderr, _("Unrecognised disassembler option: %s\n"), option); | |
82 | } | |
83 | ||
84 | static void | |
85 | parse_aarch64_dis_options (const char *options) | |
86 | { | |
87 | const char *option_end; | |
88 | ||
89 | if (options == NULL) | |
90 | return; | |
91 | ||
92 | while (*options != '\0') | |
93 | { | |
94 | /* Skip empty options. */ | |
95 | if (*options == ',') | |
96 | { | |
97 | options++; | |
98 | continue; | |
99 | } | |
100 | ||
101 | /* We know that *options is neither NUL or a comma. */ | |
102 | option_end = options + 1; | |
103 | while (*option_end != ',' && *option_end != '\0') | |
104 | option_end++; | |
105 | ||
106 | parse_aarch64_dis_option (options, option_end - options); | |
107 | ||
108 | /* Go on to the next one. If option_end points to a comma, it | |
109 | will be skipped above. */ | |
110 | options = option_end; | |
111 | } | |
112 | } | |
113 | \f | |
114 | /* Functions doing the instruction disassembling. */ | |
115 | ||
116 | /* The unnamed arguments consist of the number of fields and information about | |
117 | these fields where the VALUE will be extracted from CODE and returned. | |
118 | MASK can be zero or the base mask of the opcode. | |
119 | ||
120 | N.B. the fields are required to be in such an order than the most signficant | |
121 | field for VALUE comes the first, e.g. the <index> in | |
122 | SQDMLAL <Va><d>, <Vb><n>, <Vm>.<Ts>[<index>] | |
9aff4b7a | 123 | is encoded in H:L:M in some cases, the fields H:L:M should be passed in |
a06ea964 NC |
124 | the order of H, L, M. */ |
125 | ||
126 | static inline aarch64_insn | |
127 | extract_fields (aarch64_insn code, aarch64_insn mask, ...) | |
128 | { | |
129 | uint32_t num; | |
130 | const aarch64_field *field; | |
131 | enum aarch64_field_kind kind; | |
132 | va_list va; | |
133 | ||
134 | va_start (va, mask); | |
135 | num = va_arg (va, uint32_t); | |
136 | assert (num <= 5); | |
137 | aarch64_insn value = 0x0; | |
138 | while (num--) | |
139 | { | |
140 | kind = va_arg (va, enum aarch64_field_kind); | |
141 | field = &fields[kind]; | |
142 | value <<= field->width; | |
143 | value |= extract_field (kind, code, mask); | |
144 | } | |
145 | return value; | |
146 | } | |
147 | ||
b5464a68 RS |
148 | /* Extract the value of all fields in SELF->fields from instruction CODE. |
149 | The least significant bit comes from the final field. */ | |
150 | ||
151 | static aarch64_insn | |
152 | extract_all_fields (const aarch64_operand *self, aarch64_insn code) | |
153 | { | |
154 | aarch64_insn value; | |
155 | unsigned int i; | |
156 | enum aarch64_field_kind kind; | |
157 | ||
158 | value = 0; | |
159 | for (i = 0; i < ARRAY_SIZE (self->fields) && self->fields[i] != FLD_NIL; ++i) | |
160 | { | |
161 | kind = self->fields[i]; | |
162 | value <<= fields[kind].width; | |
163 | value |= extract_field (kind, code, 0); | |
164 | } | |
165 | return value; | |
166 | } | |
167 | ||
a06ea964 NC |
168 | /* Sign-extend bit I of VALUE. */ |
169 | static inline int32_t | |
170 | sign_extend (aarch64_insn value, unsigned i) | |
171 | { | |
172 | uint32_t ret = value; | |
173 | ||
174 | assert (i < 32); | |
175 | if ((value >> i) & 0x1) | |
176 | { | |
177 | uint32_t val = (uint32_t)(-1) << i; | |
178 | ret = ret | val; | |
179 | } | |
180 | return (int32_t) ret; | |
181 | } | |
182 | ||
183 | /* N.B. the following inline helpfer functions create a dependency on the | |
184 | order of operand qualifier enumerators. */ | |
185 | ||
186 | /* Given VALUE, return qualifier for a general purpose register. */ | |
187 | static inline enum aarch64_opnd_qualifier | |
188 | get_greg_qualifier_from_value (aarch64_insn value) | |
189 | { | |
190 | enum aarch64_opnd_qualifier qualifier = AARCH64_OPND_QLF_W + value; | |
191 | assert (value <= 0x1 | |
192 | && aarch64_get_qualifier_standard_value (qualifier) == value); | |
193 | return qualifier; | |
194 | } | |
195 | ||
3067d3b9 MW |
196 | /* Given VALUE, return qualifier for a vector register. This does not support |
197 | decoding instructions that accept the 2H vector type. */ | |
198 | ||
a06ea964 NC |
199 | static inline enum aarch64_opnd_qualifier |
200 | get_vreg_qualifier_from_value (aarch64_insn value) | |
201 | { | |
202 | enum aarch64_opnd_qualifier qualifier = AARCH64_OPND_QLF_V_8B + value; | |
203 | ||
3067d3b9 MW |
204 | /* Instructions using vector type 2H should not call this function. Skip over |
205 | the 2H qualifier. */ | |
206 | if (qualifier >= AARCH64_OPND_QLF_V_2H) | |
207 | qualifier += 1; | |
208 | ||
a06ea964 NC |
209 | assert (value <= 0x8 |
210 | && aarch64_get_qualifier_standard_value (qualifier) == value); | |
211 | return qualifier; | |
212 | } | |
213 | ||
214 | /* Given VALUE, return qualifier for an FP or AdvSIMD scalar register. */ | |
215 | static inline enum aarch64_opnd_qualifier | |
216 | get_sreg_qualifier_from_value (aarch64_insn value) | |
217 | { | |
218 | enum aarch64_opnd_qualifier qualifier = AARCH64_OPND_QLF_S_B + value; | |
219 | ||
220 | assert (value <= 0x4 | |
221 | && aarch64_get_qualifier_standard_value (qualifier) == value); | |
222 | return qualifier; | |
223 | } | |
224 | ||
225 | /* Given the instruction in *INST which is probably half way through the | |
226 | decoding and our caller wants to know the expected qualifier for operand | |
227 | I. Return such a qualifier if we can establish it; otherwise return | |
228 | AARCH64_OPND_QLF_NIL. */ | |
229 | ||
230 | static aarch64_opnd_qualifier_t | |
231 | get_expected_qualifier (const aarch64_inst *inst, int i) | |
232 | { | |
233 | aarch64_opnd_qualifier_seq_t qualifiers; | |
234 | /* Should not be called if the qualifier is known. */ | |
235 | assert (inst->operands[i].qualifier == AARCH64_OPND_QLF_NIL); | |
236 | if (aarch64_find_best_match (inst, inst->opcode->qualifiers_list, | |
237 | i, qualifiers)) | |
238 | return qualifiers[i]; | |
239 | else | |
240 | return AARCH64_OPND_QLF_NIL; | |
241 | } | |
242 | ||
243 | /* Operand extractors. */ | |
244 | ||
245 | int | |
246 | aarch64_ext_regno (const aarch64_operand *self, aarch64_opnd_info *info, | |
247 | const aarch64_insn code, | |
248 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
249 | { | |
250 | info->reg.regno = extract_field (self->fields[0], code, 0); | |
251 | return 1; | |
252 | } | |
253 | ||
ee804238 JW |
254 | int |
255 | aarch64_ext_regno_pair (const aarch64_operand *self ATTRIBUTE_UNUSED, aarch64_opnd_info *info, | |
256 | const aarch64_insn code ATTRIBUTE_UNUSED, | |
257 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
258 | { | |
259 | assert (info->idx == 1 | |
260 | || info->idx ==3); | |
261 | info->reg.regno = inst->operands[info->idx - 1].reg.regno + 1; | |
262 | return 1; | |
263 | } | |
264 | ||
a06ea964 NC |
265 | /* e.g. IC <ic_op>{, <Xt>}. */ |
266 | int | |
267 | aarch64_ext_regrt_sysins (const aarch64_operand *self, aarch64_opnd_info *info, | |
268 | const aarch64_insn code, | |
269 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
270 | { | |
271 | info->reg.regno = extract_field (self->fields[0], code, 0); | |
272 | assert (info->idx == 1 | |
273 | && (aarch64_get_operand_class (inst->operands[0].type) | |
274 | == AARCH64_OPND_CLASS_SYSTEM)); | |
275 | /* This will make the constraint checking happy and more importantly will | |
276 | help the disassembler determine whether this operand is optional or | |
277 | not. */ | |
ea2deeec | 278 | info->present = aarch64_sys_ins_reg_has_xt (inst->operands[0].sysins_op); |
a06ea964 NC |
279 | |
280 | return 1; | |
281 | } | |
282 | ||
283 | /* e.g. SQDMLAL <Va><d>, <Vb><n>, <Vm>.<Ts>[<index>]. */ | |
284 | int | |
285 | aarch64_ext_reglane (const aarch64_operand *self, aarch64_opnd_info *info, | |
286 | const aarch64_insn code, | |
287 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
288 | { | |
289 | /* regno */ | |
290 | info->reglane.regno = extract_field (self->fields[0], code, | |
291 | inst->opcode->mask); | |
292 | ||
293 | /* Index and/or type. */ | |
294 | if (inst->opcode->iclass == asisdone | |
295 | || inst->opcode->iclass == asimdins) | |
296 | { | |
297 | if (info->type == AARCH64_OPND_En | |
298 | && inst->opcode->operands[0] == AARCH64_OPND_Ed) | |
299 | { | |
300 | unsigned shift; | |
301 | /* index2 for e.g. INS <Vd>.<Ts>[<index1>], <Vn>.<Ts>[<index2>]. */ | |
302 | assert (info->idx == 1); /* Vn */ | |
303 | aarch64_insn value = extract_field (FLD_imm4, code, 0); | |
304 | /* Depend on AARCH64_OPND_Ed to determine the qualifier. */ | |
305 | info->qualifier = get_expected_qualifier (inst, info->idx); | |
306 | shift = get_logsz (aarch64_get_qualifier_esize (info->qualifier)); | |
307 | info->reglane.index = value >> shift; | |
308 | } | |
309 | else | |
310 | { | |
311 | /* index and type for e.g. DUP <V><d>, <Vn>.<T>[<index>]. | |
312 | imm5<3:0> <V> | |
313 | 0000 RESERVED | |
314 | xxx1 B | |
315 | xx10 H | |
316 | x100 S | |
317 | 1000 D */ | |
318 | int pos = -1; | |
319 | aarch64_insn value = extract_field (FLD_imm5, code, 0); | |
320 | while (++pos <= 3 && (value & 0x1) == 0) | |
321 | value >>= 1; | |
322 | if (pos > 3) | |
323 | return 0; | |
324 | info->qualifier = get_sreg_qualifier_from_value (pos); | |
325 | info->reglane.index = (unsigned) (value >> 1); | |
326 | } | |
327 | } | |
328 | else | |
329 | { | |
330 | /* Index only for e.g. SQDMLAL <Va><d>, <Vb><n>, <Vm>.<Ts>[<index>] | |
331 | or SQDMLAL <Va><d>, <Vb><n>, <Vm>.<Ts>[<index>]. */ | |
332 | ||
333 | /* Need information in other operand(s) to help decoding. */ | |
334 | info->qualifier = get_expected_qualifier (inst, info->idx); | |
335 | switch (info->qualifier) | |
336 | { | |
337 | case AARCH64_OPND_QLF_S_H: | |
338 | /* h:l:m */ | |
339 | info->reglane.index = extract_fields (code, 0, 3, FLD_H, FLD_L, | |
340 | FLD_M); | |
341 | info->reglane.regno &= 0xf; | |
342 | break; | |
343 | case AARCH64_OPND_QLF_S_S: | |
344 | /* h:l */ | |
345 | info->reglane.index = extract_fields (code, 0, 2, FLD_H, FLD_L); | |
346 | break; | |
347 | case AARCH64_OPND_QLF_S_D: | |
348 | /* H */ | |
349 | info->reglane.index = extract_field (FLD_H, code, 0); | |
350 | break; | |
351 | default: | |
352 | return 0; | |
353 | } | |
354 | } | |
355 | ||
356 | return 1; | |
357 | } | |
358 | ||
359 | int | |
360 | aarch64_ext_reglist (const aarch64_operand *self, aarch64_opnd_info *info, | |
361 | const aarch64_insn code, | |
362 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
363 | { | |
364 | /* R */ | |
365 | info->reglist.first_regno = extract_field (self->fields[0], code, 0); | |
366 | /* len */ | |
367 | info->reglist.num_regs = extract_field (FLD_len, code, 0) + 1; | |
368 | return 1; | |
369 | } | |
370 | ||
371 | /* Decode Rt and opcode fields of Vt in AdvSIMD load/store instructions. */ | |
372 | int | |
373 | aarch64_ext_ldst_reglist (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
374 | aarch64_opnd_info *info, const aarch64_insn code, | |
375 | const aarch64_inst *inst) | |
376 | { | |
377 | aarch64_insn value; | |
378 | /* Number of elements in each structure to be loaded/stored. */ | |
379 | unsigned expected_num = get_opcode_dependent_value (inst->opcode); | |
380 | ||
381 | struct | |
382 | { | |
383 | unsigned is_reserved; | |
384 | unsigned num_regs; | |
385 | unsigned num_elements; | |
386 | } data [] = | |
387 | { {0, 4, 4}, | |
388 | {1, 4, 4}, | |
389 | {0, 4, 1}, | |
390 | {0, 4, 2}, | |
391 | {0, 3, 3}, | |
392 | {1, 3, 3}, | |
393 | {0, 3, 1}, | |
394 | {0, 1, 1}, | |
395 | {0, 2, 2}, | |
396 | {1, 2, 2}, | |
397 | {0, 2, 1}, | |
398 | }; | |
399 | ||
400 | /* Rt */ | |
401 | info->reglist.first_regno = extract_field (FLD_Rt, code, 0); | |
402 | /* opcode */ | |
403 | value = extract_field (FLD_opcode, code, 0); | |
404 | if (expected_num != data[value].num_elements || data[value].is_reserved) | |
405 | return 0; | |
406 | info->reglist.num_regs = data[value].num_regs; | |
407 | ||
408 | return 1; | |
409 | } | |
410 | ||
411 | /* Decode Rt and S fields of Vt in AdvSIMD load single structure to all | |
412 | lanes instructions. */ | |
413 | int | |
414 | aarch64_ext_ldst_reglist_r (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
415 | aarch64_opnd_info *info, const aarch64_insn code, | |
416 | const aarch64_inst *inst) | |
417 | { | |
418 | aarch64_insn value; | |
419 | ||
420 | /* Rt */ | |
421 | info->reglist.first_regno = extract_field (FLD_Rt, code, 0); | |
422 | /* S */ | |
423 | value = extract_field (FLD_S, code, 0); | |
424 | ||
425 | /* Number of registers is equal to the number of elements in | |
426 | each structure to be loaded/stored. */ | |
427 | info->reglist.num_regs = get_opcode_dependent_value (inst->opcode); | |
428 | assert (info->reglist.num_regs >= 1 && info->reglist.num_regs <= 4); | |
429 | ||
430 | /* Except when it is LD1R. */ | |
431 | if (info->reglist.num_regs == 1 && value == (aarch64_insn) 1) | |
432 | info->reglist.num_regs = 2; | |
433 | ||
434 | return 1; | |
435 | } | |
436 | ||
437 | /* Decode Q, opcode<2:1>, S, size and Rt fields of Vt in AdvSIMD | |
438 | load/store single element instructions. */ | |
439 | int | |
440 | aarch64_ext_ldst_elemlist (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
441 | aarch64_opnd_info *info, const aarch64_insn code, | |
442 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
443 | { | |
444 | aarch64_field field = {0, 0}; | |
445 | aarch64_insn QSsize; /* fields Q:S:size. */ | |
446 | aarch64_insn opcodeh2; /* opcode<2:1> */ | |
447 | ||
448 | /* Rt */ | |
449 | info->reglist.first_regno = extract_field (FLD_Rt, code, 0); | |
450 | ||
451 | /* Decode the index, opcode<2:1> and size. */ | |
452 | gen_sub_field (FLD_asisdlso_opcode, 1, 2, &field); | |
453 | opcodeh2 = extract_field_2 (&field, code, 0); | |
454 | QSsize = extract_fields (code, 0, 3, FLD_Q, FLD_S, FLD_vldst_size); | |
455 | switch (opcodeh2) | |
456 | { | |
457 | case 0x0: | |
458 | info->qualifier = AARCH64_OPND_QLF_S_B; | |
459 | /* Index encoded in "Q:S:size". */ | |
460 | info->reglist.index = QSsize; | |
461 | break; | |
462 | case 0x1: | |
76dfed02 YZ |
463 | if (QSsize & 0x1) |
464 | /* UND. */ | |
465 | return 0; | |
a06ea964 NC |
466 | info->qualifier = AARCH64_OPND_QLF_S_H; |
467 | /* Index encoded in "Q:S:size<1>". */ | |
468 | info->reglist.index = QSsize >> 1; | |
469 | break; | |
470 | case 0x2: | |
76dfed02 YZ |
471 | if ((QSsize >> 1) & 0x1) |
472 | /* UND. */ | |
473 | return 0; | |
a06ea964 NC |
474 | if ((QSsize & 0x1) == 0) |
475 | { | |
476 | info->qualifier = AARCH64_OPND_QLF_S_S; | |
477 | /* Index encoded in "Q:S". */ | |
478 | info->reglist.index = QSsize >> 2; | |
479 | } | |
480 | else | |
481 | { | |
a06ea964 NC |
482 | if (extract_field (FLD_S, code, 0)) |
483 | /* UND */ | |
484 | return 0; | |
76dfed02 YZ |
485 | info->qualifier = AARCH64_OPND_QLF_S_D; |
486 | /* Index encoded in "Q". */ | |
487 | info->reglist.index = QSsize >> 3; | |
a06ea964 NC |
488 | } |
489 | break; | |
490 | default: | |
491 | return 0; | |
492 | } | |
493 | ||
494 | info->reglist.has_index = 1; | |
495 | info->reglist.num_regs = 0; | |
496 | /* Number of registers is equal to the number of elements in | |
497 | each structure to be loaded/stored. */ | |
498 | info->reglist.num_regs = get_opcode_dependent_value (inst->opcode); | |
499 | assert (info->reglist.num_regs >= 1 && info->reglist.num_regs <= 4); | |
500 | ||
501 | return 1; | |
502 | } | |
503 | ||
504 | /* Decode fields immh:immb and/or Q for e.g. | |
505 | SSHR <Vd>.<T>, <Vn>.<T>, #<shift> | |
506 | or SSHR <V><d>, <V><n>, #<shift>. */ | |
507 | ||
508 | int | |
509 | aarch64_ext_advsimd_imm_shift (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
510 | aarch64_opnd_info *info, const aarch64_insn code, | |
511 | const aarch64_inst *inst) | |
512 | { | |
513 | int pos; | |
514 | aarch64_insn Q, imm, immh; | |
515 | enum aarch64_insn_class iclass = inst->opcode->iclass; | |
516 | ||
517 | immh = extract_field (FLD_immh, code, 0); | |
518 | if (immh == 0) | |
519 | return 0; | |
520 | imm = extract_fields (code, 0, 2, FLD_immh, FLD_immb); | |
521 | pos = 4; | |
522 | /* Get highest set bit in immh. */ | |
523 | while (--pos >= 0 && (immh & 0x8) == 0) | |
524 | immh <<= 1; | |
525 | ||
526 | assert ((iclass == asimdshf || iclass == asisdshf) | |
527 | && (info->type == AARCH64_OPND_IMM_VLSR | |
528 | || info->type == AARCH64_OPND_IMM_VLSL)); | |
529 | ||
530 | if (iclass == asimdshf) | |
531 | { | |
532 | Q = extract_field (FLD_Q, code, 0); | |
533 | /* immh Q <T> | |
534 | 0000 x SEE AdvSIMD modified immediate | |
535 | 0001 0 8B | |
536 | 0001 1 16B | |
537 | 001x 0 4H | |
538 | 001x 1 8H | |
539 | 01xx 0 2S | |
540 | 01xx 1 4S | |
541 | 1xxx 0 RESERVED | |
542 | 1xxx 1 2D */ | |
543 | info->qualifier = | |
544 | get_vreg_qualifier_from_value ((pos << 1) | (int) Q); | |
545 | } | |
546 | else | |
547 | info->qualifier = get_sreg_qualifier_from_value (pos); | |
548 | ||
549 | if (info->type == AARCH64_OPND_IMM_VLSR) | |
550 | /* immh <shift> | |
551 | 0000 SEE AdvSIMD modified immediate | |
552 | 0001 (16-UInt(immh:immb)) | |
553 | 001x (32-UInt(immh:immb)) | |
554 | 01xx (64-UInt(immh:immb)) | |
555 | 1xxx (128-UInt(immh:immb)) */ | |
556 | info->imm.value = (16 << pos) - imm; | |
557 | else | |
558 | /* immh:immb | |
559 | immh <shift> | |
560 | 0000 SEE AdvSIMD modified immediate | |
561 | 0001 (UInt(immh:immb)-8) | |
562 | 001x (UInt(immh:immb)-16) | |
563 | 01xx (UInt(immh:immb)-32) | |
564 | 1xxx (UInt(immh:immb)-64) */ | |
565 | info->imm.value = imm - (8 << pos); | |
566 | ||
567 | return 1; | |
568 | } | |
569 | ||
570 | /* Decode shift immediate for e.g. sshr (imm). */ | |
571 | int | |
572 | aarch64_ext_shll_imm (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
573 | aarch64_opnd_info *info, const aarch64_insn code, | |
574 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
575 | { | |
576 | int64_t imm; | |
577 | aarch64_insn val; | |
578 | val = extract_field (FLD_size, code, 0); | |
579 | switch (val) | |
580 | { | |
581 | case 0: imm = 8; break; | |
582 | case 1: imm = 16; break; | |
583 | case 2: imm = 32; break; | |
584 | default: return 0; | |
585 | } | |
586 | info->imm.value = imm; | |
587 | return 1; | |
588 | } | |
589 | ||
590 | /* Decode imm for e.g. BFM <Wd>, <Wn>, #<immr>, #<imms>. | |
591 | value in the field(s) will be extracted as unsigned immediate value. */ | |
592 | int | |
593 | aarch64_ext_imm (const aarch64_operand *self, aarch64_opnd_info *info, | |
594 | const aarch64_insn code, | |
595 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
596 | { | |
597 | int64_t imm; | |
a06ea964 | 598 | |
b5464a68 | 599 | imm = extract_all_fields (self, code); |
a06ea964 | 600 | |
a06ea964 NC |
601 | if (operand_need_sign_extension (self)) |
602 | imm = sign_extend (imm, get_operand_fields_width (self) - 1); | |
603 | ||
604 | if (operand_need_shift_by_two (self)) | |
605 | imm <<= 2; | |
606 | ||
607 | if (info->type == AARCH64_OPND_ADDR_ADRP) | |
608 | imm <<= 12; | |
609 | ||
610 | info->imm.value = imm; | |
611 | return 1; | |
612 | } | |
613 | ||
614 | /* Decode imm and its shifter for e.g. MOVZ <Wd>, #<imm16>{, LSL #<shift>}. */ | |
615 | int | |
616 | aarch64_ext_imm_half (const aarch64_operand *self, aarch64_opnd_info *info, | |
617 | const aarch64_insn code, | |
618 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
619 | { | |
620 | aarch64_ext_imm (self, info, code, inst); | |
621 | info->shifter.kind = AARCH64_MOD_LSL; | |
622 | info->shifter.amount = extract_field (FLD_hw, code, 0) << 4; | |
623 | return 1; | |
624 | } | |
625 | ||
626 | /* Decode cmode and "a:b:c:d:e:f:g:h" for e.g. | |
627 | MOVI <Vd>.<T>, #<imm8> {, LSL #<amount>}. */ | |
628 | int | |
629 | aarch64_ext_advsimd_imm_modified (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
630 | aarch64_opnd_info *info, | |
631 | const aarch64_insn code, | |
632 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
633 | { | |
634 | uint64_t imm; | |
635 | enum aarch64_opnd_qualifier opnd0_qualifier = inst->operands[0].qualifier; | |
636 | aarch64_field field = {0, 0}; | |
637 | ||
638 | assert (info->idx == 1); | |
639 | ||
640 | if (info->type == AARCH64_OPND_SIMD_FPIMM) | |
641 | info->imm.is_fp = 1; | |
642 | ||
643 | /* a:b:c:d:e:f:g:h */ | |
644 | imm = extract_fields (code, 0, 2, FLD_abc, FLD_defgh); | |
645 | if (!info->imm.is_fp && aarch64_get_qualifier_esize (opnd0_qualifier) == 8) | |
646 | { | |
647 | /* Either MOVI <Dd>, #<imm> | |
648 | or MOVI <Vd>.2D, #<imm>. | |
649 | <imm> is a 64-bit immediate | |
650 | 'aaaaaaaabbbbbbbbccccccccddddddddeeeeeeeeffffffffgggggggghhhhhhhh', | |
651 | encoded in "a:b:c:d:e:f:g:h". */ | |
652 | int i; | |
653 | unsigned abcdefgh = imm; | |
654 | for (imm = 0ull, i = 0; i < 8; i++) | |
655 | if (((abcdefgh >> i) & 0x1) != 0) | |
656 | imm |= 0xffull << (8 * i); | |
657 | } | |
658 | info->imm.value = imm; | |
659 | ||
660 | /* cmode */ | |
661 | info->qualifier = get_expected_qualifier (inst, info->idx); | |
662 | switch (info->qualifier) | |
663 | { | |
664 | case AARCH64_OPND_QLF_NIL: | |
665 | /* no shift */ | |
666 | info->shifter.kind = AARCH64_MOD_NONE; | |
667 | return 1; | |
668 | case AARCH64_OPND_QLF_LSL: | |
669 | /* shift zeros */ | |
670 | info->shifter.kind = AARCH64_MOD_LSL; | |
671 | switch (aarch64_get_qualifier_esize (opnd0_qualifier)) | |
672 | { | |
673 | case 4: gen_sub_field (FLD_cmode, 1, 2, &field); break; /* per word */ | |
674 | case 2: gen_sub_field (FLD_cmode, 1, 1, &field); break; /* per half */ | |
f5555712 | 675 | case 1: gen_sub_field (FLD_cmode, 1, 0, &field); break; /* per byte */ |
a06ea964 NC |
676 | default: assert (0); return 0; |
677 | } | |
678 | /* 00: 0; 01: 8; 10:16; 11:24. */ | |
679 | info->shifter.amount = extract_field_2 (&field, code, 0) << 3; | |
680 | break; | |
681 | case AARCH64_OPND_QLF_MSL: | |
682 | /* shift ones */ | |
683 | info->shifter.kind = AARCH64_MOD_MSL; | |
684 | gen_sub_field (FLD_cmode, 0, 1, &field); /* per word */ | |
685 | info->shifter.amount = extract_field_2 (&field, code, 0) ? 16 : 8; | |
686 | break; | |
687 | default: | |
688 | assert (0); | |
689 | return 0; | |
690 | } | |
691 | ||
692 | return 1; | |
693 | } | |
694 | ||
aa2aa4c6 RS |
695 | /* Decode an 8-bit floating-point immediate. */ |
696 | int | |
697 | aarch64_ext_fpimm (const aarch64_operand *self, aarch64_opnd_info *info, | |
698 | const aarch64_insn code, | |
699 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
700 | { | |
701 | info->imm.value = extract_all_fields (self, code); | |
702 | info->imm.is_fp = 1; | |
703 | return 1; | |
704 | } | |
705 | ||
a06ea964 NC |
706 | /* Decode scale for e.g. SCVTF <Dd>, <Wn>, #<fbits>. */ |
707 | int | |
708 | aarch64_ext_fbits (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
709 | aarch64_opnd_info *info, const aarch64_insn code, | |
710 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
711 | { | |
712 | info->imm.value = 64- extract_field (FLD_scale, code, 0); | |
713 | return 1; | |
714 | } | |
715 | ||
716 | /* Decode arithmetic immediate for e.g. | |
717 | SUBS <Wd>, <Wn|WSP>, #<imm> {, <shift>}. */ | |
718 | int | |
719 | aarch64_ext_aimm (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
720 | aarch64_opnd_info *info, const aarch64_insn code, | |
721 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
722 | { | |
723 | aarch64_insn value; | |
724 | ||
725 | info->shifter.kind = AARCH64_MOD_LSL; | |
726 | /* shift */ | |
727 | value = extract_field (FLD_shift, code, 0); | |
728 | if (value >= 2) | |
729 | return 0; | |
730 | info->shifter.amount = value ? 12 : 0; | |
731 | /* imm12 (unsigned) */ | |
732 | info->imm.value = extract_field (FLD_imm12, code, 0); | |
733 | ||
734 | return 1; | |
735 | } | |
736 | ||
737 | /* Decode logical immediate for e.g. ORR <Wd|WSP>, <Wn>, #<imm>. */ | |
738 | ||
739 | int | |
740 | aarch64_ext_limm (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
741 | aarch64_opnd_info *info, const aarch64_insn code, | |
742 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
743 | { | |
744 | uint64_t imm, mask; | |
745 | uint32_t sf; | |
746 | uint32_t N, R, S; | |
747 | unsigned simd_size; | |
748 | aarch64_insn value; | |
749 | ||
750 | value = extract_fields (code, 0, 3, FLD_N, FLD_immr, FLD_imms); | |
751 | assert (inst->operands[0].qualifier == AARCH64_OPND_QLF_W | |
752 | || inst->operands[0].qualifier == AARCH64_OPND_QLF_X); | |
753 | sf = aarch64_get_qualifier_esize (inst->operands[0].qualifier) != 4; | |
754 | ||
755 | /* value is N:immr:imms. */ | |
756 | S = value & 0x3f; | |
757 | R = (value >> 6) & 0x3f; | |
758 | N = (value >> 12) & 0x1; | |
759 | ||
760 | if (sf == 0 && N == 1) | |
761 | return 0; | |
762 | ||
763 | /* The immediate value is S+1 bits to 1, left rotated by SIMDsize - R | |
764 | (in other words, right rotated by R), then replicated. */ | |
765 | if (N != 0) | |
766 | { | |
767 | simd_size = 64; | |
768 | mask = 0xffffffffffffffffull; | |
769 | } | |
770 | else | |
771 | { | |
772 | switch (S) | |
773 | { | |
774 | case 0x00 ... 0x1f: /* 0xxxxx */ simd_size = 32; break; | |
775 | case 0x20 ... 0x2f: /* 10xxxx */ simd_size = 16; S &= 0xf; break; | |
776 | case 0x30 ... 0x37: /* 110xxx */ simd_size = 8; S &= 0x7; break; | |
777 | case 0x38 ... 0x3b: /* 1110xx */ simd_size = 4; S &= 0x3; break; | |
778 | case 0x3c ... 0x3d: /* 11110x */ simd_size = 2; S &= 0x1; break; | |
779 | default: return 0; | |
780 | } | |
781 | mask = (1ull << simd_size) - 1; | |
782 | /* Top bits are IGNORED. */ | |
783 | R &= simd_size - 1; | |
784 | } | |
785 | /* NOTE: if S = simd_size - 1 we get 0xf..f which is rejected. */ | |
786 | if (S == simd_size - 1) | |
787 | return 0; | |
788 | /* S+1 consecutive bits to 1. */ | |
789 | /* NOTE: S can't be 63 due to detection above. */ | |
790 | imm = (1ull << (S + 1)) - 1; | |
791 | /* Rotate to the left by simd_size - R. */ | |
792 | if (R != 0) | |
793 | imm = ((imm << (simd_size - R)) & mask) | (imm >> R); | |
794 | /* Replicate the value according to SIMD size. */ | |
795 | switch (simd_size) | |
796 | { | |
797 | case 2: imm = (imm << 2) | imm; | |
798 | case 4: imm = (imm << 4) | imm; | |
799 | case 8: imm = (imm << 8) | imm; | |
800 | case 16: imm = (imm << 16) | imm; | |
801 | case 32: imm = (imm << 32) | imm; | |
802 | case 64: break; | |
803 | default: assert (0); return 0; | |
804 | } | |
805 | ||
806 | info->imm.value = sf ? imm : imm & 0xffffffff; | |
807 | ||
808 | return 1; | |
809 | } | |
810 | ||
811 | /* Decode Ft for e.g. STR <Qt>, [<Xn|SP>, <R><m>{, <extend> {<amount>}}] | |
812 | or LDP <Qt1>, <Qt2>, [<Xn|SP>], #<imm>. */ | |
813 | int | |
814 | aarch64_ext_ft (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
815 | aarch64_opnd_info *info, | |
816 | const aarch64_insn code, const aarch64_inst *inst) | |
817 | { | |
818 | aarch64_insn value; | |
819 | ||
820 | /* Rt */ | |
821 | info->reg.regno = extract_field (FLD_Rt, code, 0); | |
822 | ||
823 | /* size */ | |
824 | value = extract_field (FLD_ldst_size, code, 0); | |
825 | if (inst->opcode->iclass == ldstpair_indexed | |
826 | || inst->opcode->iclass == ldstnapair_offs | |
827 | || inst->opcode->iclass == ldstpair_off | |
828 | || inst->opcode->iclass == loadlit) | |
829 | { | |
830 | enum aarch64_opnd_qualifier qualifier; | |
831 | switch (value) | |
832 | { | |
833 | case 0: qualifier = AARCH64_OPND_QLF_S_S; break; | |
834 | case 1: qualifier = AARCH64_OPND_QLF_S_D; break; | |
835 | case 2: qualifier = AARCH64_OPND_QLF_S_Q; break; | |
836 | default: return 0; | |
837 | } | |
838 | info->qualifier = qualifier; | |
839 | } | |
840 | else | |
841 | { | |
842 | /* opc1:size */ | |
843 | value = extract_fields (code, 0, 2, FLD_opc1, FLD_ldst_size); | |
844 | if (value > 0x4) | |
845 | return 0; | |
846 | info->qualifier = get_sreg_qualifier_from_value (value); | |
847 | } | |
848 | ||
849 | return 1; | |
850 | } | |
851 | ||
852 | /* Decode the address operand for e.g. STXRB <Ws>, <Wt>, [<Xn|SP>{,#0}]. */ | |
853 | int | |
854 | aarch64_ext_addr_simple (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
855 | aarch64_opnd_info *info, | |
856 | aarch64_insn code, | |
857 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
858 | { | |
859 | /* Rn */ | |
860 | info->addr.base_regno = extract_field (FLD_Rn, code, 0); | |
861 | return 1; | |
862 | } | |
863 | ||
864 | /* Decode the address operand for e.g. | |
865 | STR <Qt>, [<Xn|SP>, <R><m>{, <extend> {<amount>}}]. */ | |
866 | int | |
867 | aarch64_ext_addr_regoff (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
868 | aarch64_opnd_info *info, | |
869 | aarch64_insn code, const aarch64_inst *inst) | |
870 | { | |
871 | aarch64_insn S, value; | |
872 | ||
873 | /* Rn */ | |
874 | info->addr.base_regno = extract_field (FLD_Rn, code, 0); | |
875 | /* Rm */ | |
876 | info->addr.offset.regno = extract_field (FLD_Rm, code, 0); | |
877 | /* option */ | |
878 | value = extract_field (FLD_option, code, 0); | |
879 | info->shifter.kind = | |
880 | aarch64_get_operand_modifier_from_value (value, TRUE /* extend_p */); | |
881 | /* Fix-up the shifter kind; although the table-driven approach is | |
882 | efficient, it is slightly inflexible, thus needing this fix-up. */ | |
883 | if (info->shifter.kind == AARCH64_MOD_UXTX) | |
884 | info->shifter.kind = AARCH64_MOD_LSL; | |
885 | /* S */ | |
886 | S = extract_field (FLD_S, code, 0); | |
887 | if (S == 0) | |
888 | { | |
889 | info->shifter.amount = 0; | |
890 | info->shifter.amount_present = 0; | |
891 | } | |
892 | else | |
893 | { | |
894 | int size; | |
895 | /* Need information in other operand(s) to help achieve the decoding | |
896 | from 'S' field. */ | |
897 | info->qualifier = get_expected_qualifier (inst, info->idx); | |
898 | /* Get the size of the data element that is accessed, which may be | |
899 | different from that of the source register size, e.g. in strb/ldrb. */ | |
900 | size = aarch64_get_qualifier_esize (info->qualifier); | |
901 | info->shifter.amount = get_logsz (size); | |
902 | info->shifter.amount_present = 1; | |
903 | } | |
904 | ||
905 | return 1; | |
906 | } | |
907 | ||
908 | /* Decode the address operand for e.g. LDRSW <Xt>, [<Xn|SP>], #<simm>. */ | |
909 | int | |
910 | aarch64_ext_addr_simm (const aarch64_operand *self, aarch64_opnd_info *info, | |
911 | aarch64_insn code, const aarch64_inst *inst) | |
912 | { | |
913 | aarch64_insn imm; | |
914 | info->qualifier = get_expected_qualifier (inst, info->idx); | |
915 | ||
916 | /* Rn */ | |
917 | info->addr.base_regno = extract_field (FLD_Rn, code, 0); | |
918 | /* simm (imm9 or imm7) */ | |
919 | imm = extract_field (self->fields[0], code, 0); | |
920 | info->addr.offset.imm = sign_extend (imm, fields[self->fields[0]].width - 1); | |
921 | if (self->fields[0] == FLD_imm7) | |
922 | /* scaled immediate in ld/st pair instructions. */ | |
923 | info->addr.offset.imm *= aarch64_get_qualifier_esize (info->qualifier); | |
924 | /* qualifier */ | |
925 | if (inst->opcode->iclass == ldst_unscaled | |
926 | || inst->opcode->iclass == ldstnapair_offs | |
927 | || inst->opcode->iclass == ldstpair_off | |
928 | || inst->opcode->iclass == ldst_unpriv) | |
929 | info->addr.writeback = 0; | |
930 | else | |
931 | { | |
932 | /* pre/post- index */ | |
933 | info->addr.writeback = 1; | |
934 | if (extract_field (self->fields[1], code, 0) == 1) | |
935 | info->addr.preind = 1; | |
936 | else | |
937 | info->addr.postind = 1; | |
938 | } | |
939 | ||
940 | return 1; | |
941 | } | |
942 | ||
943 | /* Decode the address operand for e.g. LDRSW <Xt>, [<Xn|SP>{, #<simm>}]. */ | |
944 | int | |
945 | aarch64_ext_addr_uimm12 (const aarch64_operand *self, aarch64_opnd_info *info, | |
946 | aarch64_insn code, | |
947 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
948 | { | |
949 | int shift; | |
950 | info->qualifier = get_expected_qualifier (inst, info->idx); | |
951 | shift = get_logsz (aarch64_get_qualifier_esize (info->qualifier)); | |
952 | /* Rn */ | |
953 | info->addr.base_regno = extract_field (self->fields[0], code, 0); | |
954 | /* uimm12 */ | |
955 | info->addr.offset.imm = extract_field (self->fields[1], code, 0) << shift; | |
956 | return 1; | |
957 | } | |
958 | ||
959 | /* Decode the address operand for e.g. | |
960 | LD1 {<Vt>.<T>, <Vt2>.<T>, <Vt3>.<T>}, [<Xn|SP>], <Xm|#<amount>>. */ | |
961 | int | |
962 | aarch64_ext_simd_addr_post (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
963 | aarch64_opnd_info *info, | |
964 | aarch64_insn code, const aarch64_inst *inst) | |
965 | { | |
966 | /* The opcode dependent area stores the number of elements in | |
967 | each structure to be loaded/stored. */ | |
968 | int is_ld1r = get_opcode_dependent_value (inst->opcode) == 1; | |
969 | ||
970 | /* Rn */ | |
971 | info->addr.base_regno = extract_field (FLD_Rn, code, 0); | |
972 | /* Rm | #<amount> */ | |
973 | info->addr.offset.regno = extract_field (FLD_Rm, code, 0); | |
974 | if (info->addr.offset.regno == 31) | |
975 | { | |
976 | if (inst->opcode->operands[0] == AARCH64_OPND_LVt_AL) | |
977 | /* Special handling of loading single structure to all lane. */ | |
978 | info->addr.offset.imm = (is_ld1r ? 1 | |
979 | : inst->operands[0].reglist.num_regs) | |
980 | * aarch64_get_qualifier_esize (inst->operands[0].qualifier); | |
981 | else | |
982 | info->addr.offset.imm = inst->operands[0].reglist.num_regs | |
983 | * aarch64_get_qualifier_esize (inst->operands[0].qualifier) | |
984 | * aarch64_get_qualifier_nelem (inst->operands[0].qualifier); | |
985 | } | |
986 | else | |
987 | info->addr.offset.is_reg = 1; | |
988 | info->addr.writeback = 1; | |
989 | ||
990 | return 1; | |
991 | } | |
992 | ||
993 | /* Decode the condition operand for e.g. CSEL <Xd>, <Xn>, <Xm>, <cond>. */ | |
994 | int | |
995 | aarch64_ext_cond (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
996 | aarch64_opnd_info *info, | |
997 | aarch64_insn code, const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
998 | { | |
999 | aarch64_insn value; | |
1000 | /* cond */ | |
1001 | value = extract_field (FLD_cond, code, 0); | |
1002 | info->cond = get_cond_from_value (value); | |
1003 | return 1; | |
1004 | } | |
1005 | ||
1006 | /* Decode the system register operand for e.g. MRS <Xt>, <systemreg>. */ | |
1007 | int | |
1008 | aarch64_ext_sysreg (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
1009 | aarch64_opnd_info *info, | |
1010 | aarch64_insn code, | |
1011 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1012 | { | |
1013 | /* op0:op1:CRn:CRm:op2 */ | |
1014 | info->sysreg = extract_fields (code, 0, 5, FLD_op0, FLD_op1, FLD_CRn, | |
1015 | FLD_CRm, FLD_op2); | |
1016 | return 1; | |
1017 | } | |
1018 | ||
1019 | /* Decode the PSTATE field operand for e.g. MSR <pstatefield>, #<imm>. */ | |
1020 | int | |
1021 | aarch64_ext_pstatefield (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
1022 | aarch64_opnd_info *info, aarch64_insn code, | |
1023 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1024 | { | |
1025 | int i; | |
1026 | /* op1:op2 */ | |
1027 | info->pstatefield = extract_fields (code, 0, 2, FLD_op1, FLD_op2); | |
1028 | for (i = 0; aarch64_pstatefields[i].name != NULL; ++i) | |
1029 | if (aarch64_pstatefields[i].value == (aarch64_insn)info->pstatefield) | |
1030 | return 1; | |
1031 | /* Reserved value in <pstatefield>. */ | |
1032 | return 0; | |
1033 | } | |
1034 | ||
1035 | /* Decode the system instruction op operand for e.g. AT <at_op>, <Xt>. */ | |
1036 | int | |
1037 | aarch64_ext_sysins_op (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
1038 | aarch64_opnd_info *info, | |
1039 | aarch64_insn code, | |
1040 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1041 | { | |
1042 | int i; | |
1043 | aarch64_insn value; | |
1044 | const aarch64_sys_ins_reg *sysins_ops; | |
1045 | /* op0:op1:CRn:CRm:op2 */ | |
1046 | value = extract_fields (code, 0, 5, | |
1047 | FLD_op0, FLD_op1, FLD_CRn, | |
1048 | FLD_CRm, FLD_op2); | |
1049 | ||
1050 | switch (info->type) | |
1051 | { | |
1052 | case AARCH64_OPND_SYSREG_AT: sysins_ops = aarch64_sys_regs_at; break; | |
1053 | case AARCH64_OPND_SYSREG_DC: sysins_ops = aarch64_sys_regs_dc; break; | |
1054 | case AARCH64_OPND_SYSREG_IC: sysins_ops = aarch64_sys_regs_ic; break; | |
1055 | case AARCH64_OPND_SYSREG_TLBI: sysins_ops = aarch64_sys_regs_tlbi; break; | |
1056 | default: assert (0); return 0; | |
1057 | } | |
1058 | ||
875880c6 | 1059 | for (i = 0; sysins_ops[i].name != NULL; ++i) |
a06ea964 NC |
1060 | if (sysins_ops[i].value == value) |
1061 | { | |
1062 | info->sysins_op = sysins_ops + i; | |
1063 | DEBUG_TRACE ("%s found value: %x, has_xt: %d, i: %d.", | |
875880c6 | 1064 | info->sysins_op->name, |
a06ea964 | 1065 | (unsigned)info->sysins_op->value, |
ea2deeec | 1066 | aarch64_sys_ins_reg_has_xt (info->sysins_op), i); |
a06ea964 NC |
1067 | return 1; |
1068 | } | |
1069 | ||
1070 | return 0; | |
1071 | } | |
1072 | ||
1073 | /* Decode the memory barrier option operand for e.g. DMB <option>|#<imm>. */ | |
1074 | ||
1075 | int | |
1076 | aarch64_ext_barrier (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
1077 | aarch64_opnd_info *info, | |
1078 | aarch64_insn code, | |
1079 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1080 | { | |
1081 | /* CRm */ | |
1082 | info->barrier = aarch64_barrier_options + extract_field (FLD_CRm, code, 0); | |
1083 | return 1; | |
1084 | } | |
1085 | ||
1086 | /* Decode the prefetch operation option operand for e.g. | |
1087 | PRFM <prfop>, [<Xn|SP>{, #<pimm>}]. */ | |
1088 | ||
1089 | int | |
1090 | aarch64_ext_prfop (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
1091 | aarch64_opnd_info *info, | |
1092 | aarch64_insn code, const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1093 | { | |
1094 | /* prfop in Rt */ | |
1095 | info->prfop = aarch64_prfops + extract_field (FLD_Rt, code, 0); | |
1096 | return 1; | |
1097 | } | |
1098 | ||
9ed608f9 MW |
1099 | /* Decode the hint number for an alias taking an operand. Set info->hint_option |
1100 | to the matching name/value pair in aarch64_hint_options. */ | |
1101 | ||
1102 | int | |
1103 | aarch64_ext_hint (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
1104 | aarch64_opnd_info *info, | |
1105 | aarch64_insn code, | |
1106 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1107 | { | |
1108 | /* CRm:op2. */ | |
1109 | unsigned hint_number; | |
1110 | int i; | |
1111 | ||
1112 | hint_number = extract_fields (code, 0, 2, FLD_CRm, FLD_op2); | |
1113 | ||
1114 | for (i = 0; aarch64_hint_options[i].name != NULL; i++) | |
1115 | { | |
1116 | if (hint_number == aarch64_hint_options[i].value) | |
1117 | { | |
1118 | info->hint_option = &(aarch64_hint_options[i]); | |
1119 | return 1; | |
1120 | } | |
1121 | } | |
1122 | ||
1123 | return 0; | |
1124 | } | |
1125 | ||
a06ea964 NC |
1126 | /* Decode the extended register operand for e.g. |
1127 | STR <Qt>, [<Xn|SP>, <R><m>{, <extend> {<amount>}}]. */ | |
1128 | int | |
1129 | aarch64_ext_reg_extended (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
1130 | aarch64_opnd_info *info, | |
1131 | aarch64_insn code, | |
1132 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1133 | { | |
1134 | aarch64_insn value; | |
1135 | ||
1136 | /* Rm */ | |
1137 | info->reg.regno = extract_field (FLD_Rm, code, 0); | |
1138 | /* option */ | |
1139 | value = extract_field (FLD_option, code, 0); | |
1140 | info->shifter.kind = | |
1141 | aarch64_get_operand_modifier_from_value (value, TRUE /* extend_p */); | |
1142 | /* imm3 */ | |
1143 | info->shifter.amount = extract_field (FLD_imm3, code, 0); | |
1144 | ||
1145 | /* This makes the constraint checking happy. */ | |
1146 | info->shifter.operator_present = 1; | |
1147 | ||
1148 | /* Assume inst->operands[0].qualifier has been resolved. */ | |
1149 | assert (inst->operands[0].qualifier != AARCH64_OPND_QLF_NIL); | |
1150 | info->qualifier = AARCH64_OPND_QLF_W; | |
1151 | if (inst->operands[0].qualifier == AARCH64_OPND_QLF_X | |
1152 | && (info->shifter.kind == AARCH64_MOD_UXTX | |
1153 | || info->shifter.kind == AARCH64_MOD_SXTX)) | |
1154 | info->qualifier = AARCH64_OPND_QLF_X; | |
1155 | ||
1156 | return 1; | |
1157 | } | |
1158 | ||
1159 | /* Decode the shifted register operand for e.g. | |
1160 | SUBS <Xd>, <Xn>, <Xm> {, <shift> #<amount>}. */ | |
1161 | int | |
1162 | aarch64_ext_reg_shifted (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
1163 | aarch64_opnd_info *info, | |
1164 | aarch64_insn code, | |
1165 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1166 | { | |
1167 | aarch64_insn value; | |
1168 | ||
1169 | /* Rm */ | |
1170 | info->reg.regno = extract_field (FLD_Rm, code, 0); | |
1171 | /* shift */ | |
1172 | value = extract_field (FLD_shift, code, 0); | |
1173 | info->shifter.kind = | |
1174 | aarch64_get_operand_modifier_from_value (value, FALSE /* extend_p */); | |
1175 | if (info->shifter.kind == AARCH64_MOD_ROR | |
1176 | && inst->opcode->iclass != log_shift) | |
1177 | /* ROR is not available for the shifted register operand in arithmetic | |
1178 | instructions. */ | |
1179 | return 0; | |
1180 | /* imm6 */ | |
1181 | info->shifter.amount = extract_field (FLD_imm6, code, 0); | |
1182 | ||
1183 | /* This makes the constraint checking happy. */ | |
1184 | info->shifter.operator_present = 1; | |
1185 | ||
1186 | return 1; | |
1187 | } | |
f11ad6bc | 1188 | |
98907a70 RS |
1189 | /* Decode an SVE address [<base>, #<offset>*<factor>, MUL VL], |
1190 | where <offset> is given by the OFFSET parameter and where <factor> is | |
1191 | 1 plus SELF's operand-dependent value. fields[0] specifies the field | |
1192 | that holds <base>. */ | |
1193 | static int | |
1194 | aarch64_ext_sve_addr_reg_mul_vl (const aarch64_operand *self, | |
1195 | aarch64_opnd_info *info, aarch64_insn code, | |
1196 | int64_t offset) | |
1197 | { | |
1198 | info->addr.base_regno = extract_field (self->fields[0], code, 0); | |
1199 | info->addr.offset.imm = offset * (1 + get_operand_specific_data (self)); | |
1200 | info->addr.offset.is_reg = FALSE; | |
1201 | info->addr.writeback = FALSE; | |
1202 | info->addr.preind = TRUE; | |
1203 | if (offset != 0) | |
1204 | info->shifter.kind = AARCH64_MOD_MUL_VL; | |
1205 | info->shifter.amount = 1; | |
1206 | info->shifter.operator_present = (info->addr.offset.imm != 0); | |
1207 | info->shifter.amount_present = FALSE; | |
1208 | return 1; | |
1209 | } | |
1210 | ||
1211 | /* Decode an SVE address [<base>, #<simm4>*<factor>, MUL VL], | |
1212 | where <simm4> is a 4-bit signed value and where <factor> is 1 plus | |
1213 | SELF's operand-dependent value. fields[0] specifies the field that | |
1214 | holds <base>. <simm4> is encoded in the SVE_imm4 field. */ | |
1215 | int | |
1216 | aarch64_ext_sve_addr_ri_s4xvl (const aarch64_operand *self, | |
1217 | aarch64_opnd_info *info, aarch64_insn code, | |
1218 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1219 | { | |
1220 | int offset; | |
1221 | ||
1222 | offset = extract_field (FLD_SVE_imm4, code, 0); | |
1223 | offset = ((offset + 8) & 15) - 8; | |
1224 | return aarch64_ext_sve_addr_reg_mul_vl (self, info, code, offset); | |
1225 | } | |
1226 | ||
1227 | /* Decode an SVE address [<base>, #<simm6>*<factor>, MUL VL], | |
1228 | where <simm6> is a 6-bit signed value and where <factor> is 1 plus | |
1229 | SELF's operand-dependent value. fields[0] specifies the field that | |
1230 | holds <base>. <simm6> is encoded in the SVE_imm6 field. */ | |
1231 | int | |
1232 | aarch64_ext_sve_addr_ri_s6xvl (const aarch64_operand *self, | |
1233 | aarch64_opnd_info *info, aarch64_insn code, | |
1234 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1235 | { | |
1236 | int offset; | |
1237 | ||
1238 | offset = extract_field (FLD_SVE_imm6, code, 0); | |
1239 | offset = (((offset + 32) & 63) - 32); | |
1240 | return aarch64_ext_sve_addr_reg_mul_vl (self, info, code, offset); | |
1241 | } | |
1242 | ||
1243 | /* Decode an SVE address [<base>, #<simm9>*<factor>, MUL VL], | |
1244 | where <simm9> is a 9-bit signed value and where <factor> is 1 plus | |
1245 | SELF's operand-dependent value. fields[0] specifies the field that | |
1246 | holds <base>. <simm9> is encoded in the concatenation of the SVE_imm6 | |
1247 | and imm3 fields, with imm3 being the less-significant part. */ | |
1248 | int | |
1249 | aarch64_ext_sve_addr_ri_s9xvl (const aarch64_operand *self, | |
1250 | aarch64_opnd_info *info, | |
1251 | aarch64_insn code, | |
1252 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1253 | { | |
1254 | int offset; | |
1255 | ||
1256 | offset = extract_fields (code, 0, 2, FLD_SVE_imm6, FLD_imm3); | |
1257 | offset = (((offset + 256) & 511) - 256); | |
1258 | return aarch64_ext_sve_addr_reg_mul_vl (self, info, code, offset); | |
1259 | } | |
1260 | ||
4df068de RS |
1261 | /* Decode an SVE address [<base>, #<offset> << <shift>], where <offset> |
1262 | is given by the OFFSET parameter and where <shift> is SELF's operand- | |
1263 | dependent value. fields[0] specifies the base register field <base>. */ | |
1264 | static int | |
1265 | aarch64_ext_sve_addr_reg_imm (const aarch64_operand *self, | |
1266 | aarch64_opnd_info *info, aarch64_insn code, | |
1267 | int64_t offset) | |
1268 | { | |
1269 | info->addr.base_regno = extract_field (self->fields[0], code, 0); | |
1270 | info->addr.offset.imm = offset * (1 << get_operand_specific_data (self)); | |
1271 | info->addr.offset.is_reg = FALSE; | |
1272 | info->addr.writeback = FALSE; | |
1273 | info->addr.preind = TRUE; | |
1274 | info->shifter.operator_present = FALSE; | |
1275 | info->shifter.amount_present = FALSE; | |
1276 | return 1; | |
1277 | } | |
1278 | ||
1279 | /* Decode an SVE address [X<n>, #<SVE_imm6> << <shift>], where <SVE_imm6> | |
1280 | is a 6-bit unsigned number and where <shift> is SELF's operand-dependent | |
1281 | value. fields[0] specifies the base register field. */ | |
1282 | int | |
1283 | aarch64_ext_sve_addr_ri_u6 (const aarch64_operand *self, | |
1284 | aarch64_opnd_info *info, aarch64_insn code, | |
1285 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1286 | { | |
1287 | int offset = extract_field (FLD_SVE_imm6, code, 0); | |
1288 | return aarch64_ext_sve_addr_reg_imm (self, info, code, offset); | |
1289 | } | |
1290 | ||
1291 | /* Decode an SVE address [X<n>, X<m>{, LSL #<shift>}], where <shift> | |
1292 | is SELF's operand-dependent value. fields[0] specifies the base | |
1293 | register field and fields[1] specifies the offset register field. */ | |
1294 | int | |
1295 | aarch64_ext_sve_addr_rr_lsl (const aarch64_operand *self, | |
1296 | aarch64_opnd_info *info, aarch64_insn code, | |
1297 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1298 | { | |
1299 | int index; | |
1300 | ||
1301 | index = extract_field (self->fields[1], code, 0); | |
1302 | if (index == 31 && (self->flags & OPD_F_NO_ZR) != 0) | |
1303 | return 0; | |
1304 | ||
1305 | info->addr.base_regno = extract_field (self->fields[0], code, 0); | |
1306 | info->addr.offset.regno = index; | |
1307 | info->addr.offset.is_reg = TRUE; | |
1308 | info->addr.writeback = FALSE; | |
1309 | info->addr.preind = TRUE; | |
1310 | info->shifter.kind = AARCH64_MOD_LSL; | |
1311 | info->shifter.amount = get_operand_specific_data (self); | |
1312 | info->shifter.operator_present = (info->shifter.amount != 0); | |
1313 | info->shifter.amount_present = (info->shifter.amount != 0); | |
1314 | return 1; | |
1315 | } | |
1316 | ||
1317 | /* Decode an SVE address [X<n>, Z<m>.<T>, (S|U)XTW {#<shift>}], where | |
1318 | <shift> is SELF's operand-dependent value. fields[0] specifies the | |
1319 | base register field, fields[1] specifies the offset register field and | |
1320 | fields[2] is a single-bit field that selects SXTW over UXTW. */ | |
1321 | int | |
1322 | aarch64_ext_sve_addr_rz_xtw (const aarch64_operand *self, | |
1323 | aarch64_opnd_info *info, aarch64_insn code, | |
1324 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1325 | { | |
1326 | info->addr.base_regno = extract_field (self->fields[0], code, 0); | |
1327 | info->addr.offset.regno = extract_field (self->fields[1], code, 0); | |
1328 | info->addr.offset.is_reg = TRUE; | |
1329 | info->addr.writeback = FALSE; | |
1330 | info->addr.preind = TRUE; | |
1331 | if (extract_field (self->fields[2], code, 0)) | |
1332 | info->shifter.kind = AARCH64_MOD_SXTW; | |
1333 | else | |
1334 | info->shifter.kind = AARCH64_MOD_UXTW; | |
1335 | info->shifter.amount = get_operand_specific_data (self); | |
1336 | info->shifter.operator_present = TRUE; | |
1337 | info->shifter.amount_present = (info->shifter.amount != 0); | |
1338 | return 1; | |
1339 | } | |
1340 | ||
1341 | /* Decode an SVE address [Z<n>.<T>, #<imm5> << <shift>], where <imm5> is a | |
1342 | 5-bit unsigned number and where <shift> is SELF's operand-dependent value. | |
1343 | fields[0] specifies the base register field. */ | |
1344 | int | |
1345 | aarch64_ext_sve_addr_zi_u5 (const aarch64_operand *self, | |
1346 | aarch64_opnd_info *info, aarch64_insn code, | |
1347 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1348 | { | |
1349 | int offset = extract_field (FLD_imm5, code, 0); | |
1350 | return aarch64_ext_sve_addr_reg_imm (self, info, code, offset); | |
1351 | } | |
1352 | ||
1353 | /* Decode an SVE address [Z<n>.<T>, Z<m>.<T>{, <modifier> {#<msz>}}], | |
1354 | where <modifier> is given by KIND and where <msz> is a 2-bit unsigned | |
1355 | number. fields[0] specifies the base register field and fields[1] | |
1356 | specifies the offset register field. */ | |
1357 | static int | |
1358 | aarch64_ext_sve_addr_zz (const aarch64_operand *self, aarch64_opnd_info *info, | |
1359 | aarch64_insn code, enum aarch64_modifier_kind kind) | |
1360 | { | |
1361 | info->addr.base_regno = extract_field (self->fields[0], code, 0); | |
1362 | info->addr.offset.regno = extract_field (self->fields[1], code, 0); | |
1363 | info->addr.offset.is_reg = TRUE; | |
1364 | info->addr.writeback = FALSE; | |
1365 | info->addr.preind = TRUE; | |
1366 | info->shifter.kind = kind; | |
1367 | info->shifter.amount = extract_field (FLD_SVE_msz, code, 0); | |
1368 | info->shifter.operator_present = (kind != AARCH64_MOD_LSL | |
1369 | || info->shifter.amount != 0); | |
1370 | info->shifter.amount_present = (info->shifter.amount != 0); | |
1371 | return 1; | |
1372 | } | |
1373 | ||
1374 | /* Decode an SVE address [Z<n>.<T>, Z<m>.<T>{, LSL #<msz>}], where | |
1375 | <msz> is a 2-bit unsigned number. fields[0] specifies the base register | |
1376 | field and fields[1] specifies the offset register field. */ | |
1377 | int | |
1378 | aarch64_ext_sve_addr_zz_lsl (const aarch64_operand *self, | |
1379 | aarch64_opnd_info *info, aarch64_insn code, | |
1380 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1381 | { | |
1382 | return aarch64_ext_sve_addr_zz (self, info, code, AARCH64_MOD_LSL); | |
1383 | } | |
1384 | ||
1385 | /* Decode an SVE address [Z<n>.<T>, Z<m>.<T>, SXTW {#<msz>}], where | |
1386 | <msz> is a 2-bit unsigned number. fields[0] specifies the base register | |
1387 | field and fields[1] specifies the offset register field. */ | |
1388 | int | |
1389 | aarch64_ext_sve_addr_zz_sxtw (const aarch64_operand *self, | |
1390 | aarch64_opnd_info *info, aarch64_insn code, | |
1391 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1392 | { | |
1393 | return aarch64_ext_sve_addr_zz (self, info, code, AARCH64_MOD_SXTW); | |
1394 | } | |
1395 | ||
1396 | /* Decode an SVE address [Z<n>.<T>, Z<m>.<T>, UXTW {#<msz>}], where | |
1397 | <msz> is a 2-bit unsigned number. fields[0] specifies the base register | |
1398 | field and fields[1] specifies the offset register field. */ | |
1399 | int | |
1400 | aarch64_ext_sve_addr_zz_uxtw (const aarch64_operand *self, | |
1401 | aarch64_opnd_info *info, aarch64_insn code, | |
1402 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1403 | { | |
1404 | return aarch64_ext_sve_addr_zz (self, info, code, AARCH64_MOD_UXTW); | |
1405 | } | |
1406 | ||
f11ad6bc RS |
1407 | /* Decode Zn[MM], where MM has a 7-bit triangular encoding. The fields |
1408 | array specifies which field to use for Zn. MM is encoded in the | |
1409 | concatenation of imm5 and SVE_tszh, with imm5 being the less | |
1410 | significant part. */ | |
1411 | int | |
1412 | aarch64_ext_sve_index (const aarch64_operand *self, | |
1413 | aarch64_opnd_info *info, aarch64_insn code, | |
1414 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1415 | { | |
1416 | int val; | |
1417 | ||
1418 | info->reglane.regno = extract_field (self->fields[0], code, 0); | |
1419 | val = extract_fields (code, 0, 2, FLD_SVE_tszh, FLD_imm5); | |
1420 | if ((val & 15) == 0) | |
1421 | return 0; | |
1422 | while ((val & 1) == 0) | |
1423 | val /= 2; | |
1424 | info->reglane.index = val / 2; | |
1425 | return 1; | |
1426 | } | |
1427 | ||
1428 | /* Decode {Zn.<T> - Zm.<T>}. The fields array specifies which field | |
1429 | to use for Zn. The opcode-dependent value specifies the number | |
1430 | of registers in the list. */ | |
1431 | int | |
1432 | aarch64_ext_sve_reglist (const aarch64_operand *self, | |
1433 | aarch64_opnd_info *info, aarch64_insn code, | |
1434 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
1435 | { | |
1436 | info->reglist.first_regno = extract_field (self->fields[0], code, 0); | |
1437 | info->reglist.num_regs = get_opcode_dependent_value (inst->opcode); | |
1438 | return 1; | |
1439 | } | |
2442d846 RS |
1440 | |
1441 | /* Decode <pattern>{, MUL #<amount>}. The fields array specifies which | |
1442 | fields to use for <pattern>. <amount> - 1 is encoded in the SVE_imm4 | |
1443 | field. */ | |
1444 | int | |
1445 | aarch64_ext_sve_scale (const aarch64_operand *self, | |
1446 | aarch64_opnd_info *info, aarch64_insn code, | |
1447 | const aarch64_inst *inst) | |
1448 | { | |
1449 | int val; | |
1450 | ||
1451 | if (!aarch64_ext_imm (self, info, code, inst)) | |
1452 | return 0; | |
1453 | val = extract_field (FLD_SVE_imm4, code, 0); | |
1454 | info->shifter.kind = AARCH64_MOD_MUL; | |
1455 | info->shifter.amount = val + 1; | |
1456 | info->shifter.operator_present = (val != 0); | |
1457 | info->shifter.amount_present = (val != 0); | |
1458 | return 1; | |
1459 | } | |
a06ea964 NC |
1460 | \f |
1461 | /* Bitfields that are commonly used to encode certain operands' information | |
1462 | may be partially used as part of the base opcode in some instructions. | |
1463 | For example, the bit 1 of the field 'size' in | |
1464 | FCVTXN <Vb><d>, <Va><n> | |
1465 | is actually part of the base opcode, while only size<0> is available | |
1466 | for encoding the register type. Another example is the AdvSIMD | |
1467 | instruction ORR (register), in which the field 'size' is also used for | |
1468 | the base opcode, leaving only the field 'Q' available to encode the | |
1469 | vector register arrangement specifier '8B' or '16B'. | |
1470 | ||
1471 | This function tries to deduce the qualifier from the value of partially | |
1472 | constrained field(s). Given the VALUE of such a field or fields, the | |
1473 | qualifiers CANDIDATES and the MASK (indicating which bits are valid for | |
1474 | operand encoding), the function returns the matching qualifier or | |
1475 | AARCH64_OPND_QLF_NIL if nothing matches. | |
1476 | ||
1477 | N.B. CANDIDATES is a group of possible qualifiers that are valid for | |
1478 | one operand; it has a maximum of AARCH64_MAX_QLF_SEQ_NUM qualifiers and | |
1479 | may end with AARCH64_OPND_QLF_NIL. */ | |
1480 | ||
1481 | static enum aarch64_opnd_qualifier | |
1482 | get_qualifier_from_partial_encoding (aarch64_insn value, | |
1483 | const enum aarch64_opnd_qualifier* \ | |
1484 | candidates, | |
1485 | aarch64_insn mask) | |
1486 | { | |
1487 | int i; | |
1488 | DEBUG_TRACE ("enter with value: %d, mask: %d", (int)value, (int)mask); | |
1489 | for (i = 0; i < AARCH64_MAX_QLF_SEQ_NUM; ++i) | |
1490 | { | |
1491 | aarch64_insn standard_value; | |
1492 | if (candidates[i] == AARCH64_OPND_QLF_NIL) | |
1493 | break; | |
1494 | standard_value = aarch64_get_qualifier_standard_value (candidates[i]); | |
1495 | if ((standard_value & mask) == (value & mask)) | |
1496 | return candidates[i]; | |
1497 | } | |
1498 | return AARCH64_OPND_QLF_NIL; | |
1499 | } | |
1500 | ||
1501 | /* Given a list of qualifier sequences, return all possible valid qualifiers | |
1502 | for operand IDX in QUALIFIERS. | |
1503 | Assume QUALIFIERS is an array whose length is large enough. */ | |
1504 | ||
1505 | static void | |
1506 | get_operand_possible_qualifiers (int idx, | |
1507 | const aarch64_opnd_qualifier_seq_t *list, | |
1508 | enum aarch64_opnd_qualifier *qualifiers) | |
1509 | { | |
1510 | int i; | |
1511 | for (i = 0; i < AARCH64_MAX_QLF_SEQ_NUM; ++i) | |
1512 | if ((qualifiers[i] = list[i][idx]) == AARCH64_OPND_QLF_NIL) | |
1513 | break; | |
1514 | } | |
1515 | ||
1516 | /* Decode the size Q field for e.g. SHADD. | |
1517 | We tag one operand with the qualifer according to the code; | |
1518 | whether the qualifier is valid for this opcode or not, it is the | |
1519 | duty of the semantic checking. */ | |
1520 | ||
1521 | static int | |
1522 | decode_sizeq (aarch64_inst *inst) | |
1523 | { | |
1524 | int idx; | |
1525 | enum aarch64_opnd_qualifier qualifier; | |
1526 | aarch64_insn code; | |
1527 | aarch64_insn value, mask; | |
1528 | enum aarch64_field_kind fld_sz; | |
1529 | enum aarch64_opnd_qualifier candidates[AARCH64_MAX_QLF_SEQ_NUM]; | |
1530 | ||
1531 | if (inst->opcode->iclass == asisdlse | |
1532 | || inst->opcode->iclass == asisdlsep | |
1533 | || inst->opcode->iclass == asisdlso | |
1534 | || inst->opcode->iclass == asisdlsop) | |
1535 | fld_sz = FLD_vldst_size; | |
1536 | else | |
1537 | fld_sz = FLD_size; | |
1538 | ||
1539 | code = inst->value; | |
1540 | value = extract_fields (code, inst->opcode->mask, 2, fld_sz, FLD_Q); | |
1541 | /* Obtain the info that which bits of fields Q and size are actually | |
1542 | available for operand encoding. Opcodes like FMAXNM and FMLA have | |
1543 | size[1] unavailable. */ | |
1544 | mask = extract_fields (~inst->opcode->mask, 0, 2, fld_sz, FLD_Q); | |
1545 | ||
1546 | /* The index of the operand we are going to tag a qualifier and the qualifer | |
1547 | itself are reasoned from the value of the size and Q fields and the | |
1548 | possible valid qualifier lists. */ | |
1549 | idx = aarch64_select_operand_for_sizeq_field_coding (inst->opcode); | |
1550 | DEBUG_TRACE ("key idx: %d", idx); | |
1551 | ||
1552 | /* For most related instruciton, size:Q are fully available for operand | |
1553 | encoding. */ | |
1554 | if (mask == 0x7) | |
1555 | { | |
1556 | inst->operands[idx].qualifier = get_vreg_qualifier_from_value (value); | |
1557 | return 1; | |
1558 | } | |
1559 | ||
1560 | get_operand_possible_qualifiers (idx, inst->opcode->qualifiers_list, | |
1561 | candidates); | |
1562 | #ifdef DEBUG_AARCH64 | |
1563 | if (debug_dump) | |
1564 | { | |
1565 | int i; | |
1566 | for (i = 0; candidates[i] != AARCH64_OPND_QLF_NIL | |
1567 | && i < AARCH64_MAX_QLF_SEQ_NUM; ++i) | |
1568 | DEBUG_TRACE ("qualifier %d: %s", i, | |
1569 | aarch64_get_qualifier_name(candidates[i])); | |
1570 | DEBUG_TRACE ("%d, %d", (int)value, (int)mask); | |
1571 | } | |
1572 | #endif /* DEBUG_AARCH64 */ | |
1573 | ||
1574 | qualifier = get_qualifier_from_partial_encoding (value, candidates, mask); | |
1575 | ||
1576 | if (qualifier == AARCH64_OPND_QLF_NIL) | |
1577 | return 0; | |
1578 | ||
1579 | inst->operands[idx].qualifier = qualifier; | |
1580 | return 1; | |
1581 | } | |
1582 | ||
1583 | /* Decode size[0]:Q, i.e. bit 22 and bit 30, for | |
1584 | e.g. FCVTN<Q> <Vd>.<Tb>, <Vn>.<Ta>. */ | |
1585 | ||
1586 | static int | |
1587 | decode_asimd_fcvt (aarch64_inst *inst) | |
1588 | { | |
1589 | aarch64_field field = {0, 0}; | |
1590 | aarch64_insn value; | |
1591 | enum aarch64_opnd_qualifier qualifier; | |
1592 | ||
1593 | gen_sub_field (FLD_size, 0, 1, &field); | |
1594 | value = extract_field_2 (&field, inst->value, 0); | |
1595 | qualifier = value == 0 ? AARCH64_OPND_QLF_V_4S | |
1596 | : AARCH64_OPND_QLF_V_2D; | |
1597 | switch (inst->opcode->op) | |
1598 | { | |
1599 | case OP_FCVTN: | |
1600 | case OP_FCVTN2: | |
1601 | /* FCVTN<Q> <Vd>.<Tb>, <Vn>.<Ta>. */ | |
1602 | inst->operands[1].qualifier = qualifier; | |
1603 | break; | |
1604 | case OP_FCVTL: | |
1605 | case OP_FCVTL2: | |
1606 | /* FCVTL<Q> <Vd>.<Ta>, <Vn>.<Tb>. */ | |
1607 | inst->operands[0].qualifier = qualifier; | |
1608 | break; | |
1609 | default: | |
1610 | assert (0); | |
1611 | return 0; | |
1612 | } | |
1613 | ||
1614 | return 1; | |
1615 | } | |
1616 | ||
1617 | /* Decode size[0], i.e. bit 22, for | |
1618 | e.g. FCVTXN <Vb><d>, <Va><n>. */ | |
1619 | ||
1620 | static int | |
1621 | decode_asisd_fcvtxn (aarch64_inst *inst) | |
1622 | { | |
1623 | aarch64_field field = {0, 0}; | |
1624 | gen_sub_field (FLD_size, 0, 1, &field); | |
1625 | if (!extract_field_2 (&field, inst->value, 0)) | |
1626 | return 0; | |
1627 | inst->operands[0].qualifier = AARCH64_OPND_QLF_S_S; | |
1628 | return 1; | |
1629 | } | |
1630 | ||
1631 | /* Decode the 'opc' field for e.g. FCVT <Dd>, <Sn>. */ | |
1632 | static int | |
1633 | decode_fcvt (aarch64_inst *inst) | |
1634 | { | |
1635 | enum aarch64_opnd_qualifier qualifier; | |
1636 | aarch64_insn value; | |
1637 | const aarch64_field field = {15, 2}; | |
1638 | ||
1639 | /* opc dstsize */ | |
1640 | value = extract_field_2 (&field, inst->value, 0); | |
1641 | switch (value) | |
1642 | { | |
1643 | case 0: qualifier = AARCH64_OPND_QLF_S_S; break; | |
1644 | case 1: qualifier = AARCH64_OPND_QLF_S_D; break; | |
1645 | case 3: qualifier = AARCH64_OPND_QLF_S_H; break; | |
1646 | default: return 0; | |
1647 | } | |
1648 | inst->operands[0].qualifier = qualifier; | |
1649 | ||
1650 | return 1; | |
1651 | } | |
1652 | ||
1653 | /* Do miscellaneous decodings that are not common enough to be driven by | |
1654 | flags. */ | |
1655 | ||
1656 | static int | |
1657 | do_misc_decoding (aarch64_inst *inst) | |
1658 | { | |
1659 | switch (inst->opcode->op) | |
1660 | { | |
1661 | case OP_FCVT: | |
1662 | return decode_fcvt (inst); | |
1663 | case OP_FCVTN: | |
1664 | case OP_FCVTN2: | |
1665 | case OP_FCVTL: | |
1666 | case OP_FCVTL2: | |
1667 | return decode_asimd_fcvt (inst); | |
1668 | case OP_FCVTXN_S: | |
1669 | return decode_asisd_fcvtxn (inst); | |
1670 | default: | |
1671 | return 0; | |
1672 | } | |
1673 | } | |
1674 | ||
1675 | /* Opcodes that have fields shared by multiple operands are usually flagged | |
1676 | with flags. In this function, we detect such flags, decode the related | |
1677 | field(s) and store the information in one of the related operands. The | |
1678 | 'one' operand is not any operand but one of the operands that can | |
1679 | accommadate all the information that has been decoded. */ | |
1680 | ||
1681 | static int | |
1682 | do_special_decoding (aarch64_inst *inst) | |
1683 | { | |
1684 | int idx; | |
1685 | aarch64_insn value; | |
1686 | /* Condition for truly conditional executed instructions, e.g. b.cond. */ | |
1687 | if (inst->opcode->flags & F_COND) | |
1688 | { | |
1689 | value = extract_field (FLD_cond2, inst->value, 0); | |
1690 | inst->cond = get_cond_from_value (value); | |
1691 | } | |
1692 | /* 'sf' field. */ | |
1693 | if (inst->opcode->flags & F_SF) | |
1694 | { | |
1695 | idx = select_operand_for_sf_field_coding (inst->opcode); | |
1696 | value = extract_field (FLD_sf, inst->value, 0); | |
1697 | inst->operands[idx].qualifier = get_greg_qualifier_from_value (value); | |
1698 | if ((inst->opcode->flags & F_N) | |
1699 | && extract_field (FLD_N, inst->value, 0) != value) | |
1700 | return 0; | |
1701 | } | |
ee804238 JW |
1702 | /* 'sf' field. */ |
1703 | if (inst->opcode->flags & F_LSE_SZ) | |
1704 | { | |
1705 | idx = select_operand_for_sf_field_coding (inst->opcode); | |
1706 | value = extract_field (FLD_lse_sz, inst->value, 0); | |
1707 | inst->operands[idx].qualifier = get_greg_qualifier_from_value (value); | |
1708 | } | |
a06ea964 NC |
1709 | /* size:Q fields. */ |
1710 | if (inst->opcode->flags & F_SIZEQ) | |
1711 | return decode_sizeq (inst); | |
1712 | ||
1713 | if (inst->opcode->flags & F_FPTYPE) | |
1714 | { | |
1715 | idx = select_operand_for_fptype_field_coding (inst->opcode); | |
1716 | value = extract_field (FLD_type, inst->value, 0); | |
1717 | switch (value) | |
1718 | { | |
1719 | case 0: inst->operands[idx].qualifier = AARCH64_OPND_QLF_S_S; break; | |
1720 | case 1: inst->operands[idx].qualifier = AARCH64_OPND_QLF_S_D; break; | |
1721 | case 3: inst->operands[idx].qualifier = AARCH64_OPND_QLF_S_H; break; | |
1722 | default: return 0; | |
1723 | } | |
1724 | } | |
1725 | ||
1726 | if (inst->opcode->flags & F_SSIZE) | |
1727 | { | |
1728 | /* N.B. some opcodes like FCMGT <V><d>, <V><n>, #0 have the size[1] as part | |
1729 | of the base opcode. */ | |
1730 | aarch64_insn mask; | |
1731 | enum aarch64_opnd_qualifier candidates[AARCH64_MAX_QLF_SEQ_NUM]; | |
1732 | idx = select_operand_for_scalar_size_field_coding (inst->opcode); | |
1733 | value = extract_field (FLD_size, inst->value, inst->opcode->mask); | |
1734 | mask = extract_field (FLD_size, ~inst->opcode->mask, 0); | |
1735 | /* For most related instruciton, the 'size' field is fully available for | |
1736 | operand encoding. */ | |
1737 | if (mask == 0x3) | |
1738 | inst->operands[idx].qualifier = get_sreg_qualifier_from_value (value); | |
1739 | else | |
1740 | { | |
1741 | get_operand_possible_qualifiers (idx, inst->opcode->qualifiers_list, | |
1742 | candidates); | |
1743 | inst->operands[idx].qualifier | |
1744 | = get_qualifier_from_partial_encoding (value, candidates, mask); | |
1745 | } | |
1746 | } | |
1747 | ||
1748 | if (inst->opcode->flags & F_T) | |
1749 | { | |
1750 | /* Num of consecutive '0's on the right side of imm5<3:0>. */ | |
1751 | int num = 0; | |
1752 | unsigned val, Q; | |
1753 | assert (aarch64_get_operand_class (inst->opcode->operands[0]) | |
1754 | == AARCH64_OPND_CLASS_SIMD_REG); | |
1755 | /* imm5<3:0> q <t> | |
1756 | 0000 x reserved | |
1757 | xxx1 0 8b | |
1758 | xxx1 1 16b | |
1759 | xx10 0 4h | |
1760 | xx10 1 8h | |
1761 | x100 0 2s | |
1762 | x100 1 4s | |
1763 | 1000 0 reserved | |
1764 | 1000 1 2d */ | |
1765 | val = extract_field (FLD_imm5, inst->value, 0); | |
1766 | while ((val & 0x1) == 0 && ++num <= 3) | |
1767 | val >>= 1; | |
1768 | if (num > 3) | |
1769 | return 0; | |
1770 | Q = (unsigned) extract_field (FLD_Q, inst->value, inst->opcode->mask); | |
1771 | inst->operands[0].qualifier = | |
1772 | get_vreg_qualifier_from_value ((num << 1) | Q); | |
1773 | } | |
1774 | ||
1775 | if (inst->opcode->flags & F_GPRSIZE_IN_Q) | |
1776 | { | |
1777 | /* Use Rt to encode in the case of e.g. | |
1778 | STXP <Ws>, <Xt1>, <Xt2>, [<Xn|SP>{,#0}]. */ | |
1779 | idx = aarch64_operand_index (inst->opcode->operands, AARCH64_OPND_Rt); | |
1780 | if (idx == -1) | |
1781 | { | |
1782 | /* Otherwise use the result operand, which has to be a integer | |
1783 | register. */ | |
1784 | assert (aarch64_get_operand_class (inst->opcode->operands[0]) | |
1785 | == AARCH64_OPND_CLASS_INT_REG); | |
1786 | idx = 0; | |
1787 | } | |
1788 | assert (idx == 0 || idx == 1); | |
1789 | value = extract_field (FLD_Q, inst->value, 0); | |
1790 | inst->operands[idx].qualifier = get_greg_qualifier_from_value (value); | |
1791 | } | |
1792 | ||
1793 | if (inst->opcode->flags & F_LDS_SIZE) | |
1794 | { | |
1795 | aarch64_field field = {0, 0}; | |
1796 | assert (aarch64_get_operand_class (inst->opcode->operands[0]) | |
1797 | == AARCH64_OPND_CLASS_INT_REG); | |
1798 | gen_sub_field (FLD_opc, 0, 1, &field); | |
1799 | value = extract_field_2 (&field, inst->value, 0); | |
1800 | inst->operands[0].qualifier | |
1801 | = value ? AARCH64_OPND_QLF_W : AARCH64_OPND_QLF_X; | |
1802 | } | |
1803 | ||
1804 | /* Miscellaneous decoding; done as the last step. */ | |
1805 | if (inst->opcode->flags & F_MISC) | |
1806 | return do_misc_decoding (inst); | |
1807 | ||
1808 | return 1; | |
1809 | } | |
1810 | ||
1811 | /* Converters converting a real opcode instruction to its alias form. */ | |
1812 | ||
1813 | /* ROR <Wd>, <Ws>, #<shift> | |
1814 | is equivalent to: | |
1815 | EXTR <Wd>, <Ws>, <Ws>, #<shift>. */ | |
1816 | static int | |
1817 | convert_extr_to_ror (aarch64_inst *inst) | |
1818 | { | |
1819 | if (inst->operands[1].reg.regno == inst->operands[2].reg.regno) | |
1820 | { | |
1821 | copy_operand_info (inst, 2, 3); | |
1822 | inst->operands[3].type = AARCH64_OPND_NIL; | |
1823 | return 1; | |
1824 | } | |
1825 | return 0; | |
1826 | } | |
1827 | ||
e30181a5 YZ |
1828 | /* UXTL<Q> <Vd>.<Ta>, <Vn>.<Tb> |
1829 | is equivalent to: | |
1830 | USHLL<Q> <Vd>.<Ta>, <Vn>.<Tb>, #0. */ | |
1831 | static int | |
1832 | convert_shll_to_xtl (aarch64_inst *inst) | |
1833 | { | |
1834 | if (inst->operands[2].imm.value == 0) | |
1835 | { | |
1836 | inst->operands[2].type = AARCH64_OPND_NIL; | |
1837 | return 1; | |
1838 | } | |
1839 | return 0; | |
1840 | } | |
1841 | ||
a06ea964 NC |
1842 | /* Convert |
1843 | UBFM <Xd>, <Xn>, #<shift>, #63. | |
1844 | to | |
1845 | LSR <Xd>, <Xn>, #<shift>. */ | |
1846 | static int | |
1847 | convert_bfm_to_sr (aarch64_inst *inst) | |
1848 | { | |
1849 | int64_t imms, val; | |
1850 | ||
1851 | imms = inst->operands[3].imm.value; | |
1852 | val = inst->operands[2].qualifier == AARCH64_OPND_QLF_imm_0_31 ? 31 : 63; | |
1853 | if (imms == val) | |
1854 | { | |
1855 | inst->operands[3].type = AARCH64_OPND_NIL; | |
1856 | return 1; | |
1857 | } | |
1858 | ||
1859 | return 0; | |
1860 | } | |
1861 | ||
1862 | /* Convert MOV to ORR. */ | |
1863 | static int | |
1864 | convert_orr_to_mov (aarch64_inst *inst) | |
1865 | { | |
1866 | /* MOV <Vd>.<T>, <Vn>.<T> | |
1867 | is equivalent to: | |
1868 | ORR <Vd>.<T>, <Vn>.<T>, <Vn>.<T>. */ | |
1869 | if (inst->operands[1].reg.regno == inst->operands[2].reg.regno) | |
1870 | { | |
1871 | inst->operands[2].type = AARCH64_OPND_NIL; | |
1872 | return 1; | |
1873 | } | |
1874 | return 0; | |
1875 | } | |
1876 | ||
1877 | /* When <imms> >= <immr>, the instruction written: | |
1878 | SBFX <Xd>, <Xn>, #<lsb>, #<width> | |
1879 | is equivalent to: | |
1880 | SBFM <Xd>, <Xn>, #<lsb>, #(<lsb>+<width>-1). */ | |
1881 | ||
1882 | static int | |
1883 | convert_bfm_to_bfx (aarch64_inst *inst) | |
1884 | { | |
1885 | int64_t immr, imms; | |
1886 | ||
1887 | immr = inst->operands[2].imm.value; | |
1888 | imms = inst->operands[3].imm.value; | |
1889 | if (imms >= immr) | |
1890 | { | |
1891 | int64_t lsb = immr; | |
1892 | inst->operands[2].imm.value = lsb; | |
1893 | inst->operands[3].imm.value = imms + 1 - lsb; | |
1894 | /* The two opcodes have different qualifiers for | |
1895 | the immediate operands; reset to help the checking. */ | |
1896 | reset_operand_qualifier (inst, 2); | |
1897 | reset_operand_qualifier (inst, 3); | |
1898 | return 1; | |
1899 | } | |
1900 | ||
1901 | return 0; | |
1902 | } | |
1903 | ||
1904 | /* When <imms> < <immr>, the instruction written: | |
1905 | SBFIZ <Xd>, <Xn>, #<lsb>, #<width> | |
1906 | is equivalent to: | |
1907 | SBFM <Xd>, <Xn>, #((64-<lsb>)&0x3f), #(<width>-1). */ | |
1908 | ||
1909 | static int | |
1910 | convert_bfm_to_bfi (aarch64_inst *inst) | |
1911 | { | |
1912 | int64_t immr, imms, val; | |
1913 | ||
1914 | immr = inst->operands[2].imm.value; | |
1915 | imms = inst->operands[3].imm.value; | |
1916 | val = inst->operands[2].qualifier == AARCH64_OPND_QLF_imm_0_31 ? 32 : 64; | |
1917 | if (imms < immr) | |
1918 | { | |
1919 | inst->operands[2].imm.value = (val - immr) & (val - 1); | |
1920 | inst->operands[3].imm.value = imms + 1; | |
1921 | /* The two opcodes have different qualifiers for | |
1922 | the immediate operands; reset to help the checking. */ | |
1923 | reset_operand_qualifier (inst, 2); | |
1924 | reset_operand_qualifier (inst, 3); | |
1925 | return 1; | |
1926 | } | |
1927 | ||
1928 | return 0; | |
1929 | } | |
1930 | ||
d685192a MW |
1931 | /* The instruction written: |
1932 | BFC <Xd>, #<lsb>, #<width> | |
1933 | is equivalent to: | |
1934 | BFM <Xd>, XZR, #((64-<lsb>)&0x3f), #(<width>-1). */ | |
1935 | ||
1936 | static int | |
1937 | convert_bfm_to_bfc (aarch64_inst *inst) | |
1938 | { | |
1939 | int64_t immr, imms, val; | |
1940 | ||
1941 | /* Should have been assured by the base opcode value. */ | |
1942 | assert (inst->operands[1].reg.regno == 0x1f); | |
1943 | ||
1944 | immr = inst->operands[2].imm.value; | |
1945 | imms = inst->operands[3].imm.value; | |
1946 | val = inst->operands[2].qualifier == AARCH64_OPND_QLF_imm_0_31 ? 32 : 64; | |
1947 | if (imms < immr) | |
1948 | { | |
1949 | /* Drop XZR from the second operand. */ | |
1950 | copy_operand_info (inst, 1, 2); | |
1951 | copy_operand_info (inst, 2, 3); | |
1952 | inst->operands[3].type = AARCH64_OPND_NIL; | |
1953 | ||
1954 | /* Recalculate the immediates. */ | |
1955 | inst->operands[1].imm.value = (val - immr) & (val - 1); | |
1956 | inst->operands[2].imm.value = imms + 1; | |
1957 | ||
1958 | /* The two opcodes have different qualifiers for the operands; reset to | |
1959 | help the checking. */ | |
1960 | reset_operand_qualifier (inst, 1); | |
1961 | reset_operand_qualifier (inst, 2); | |
1962 | reset_operand_qualifier (inst, 3); | |
1963 | ||
1964 | return 1; | |
1965 | } | |
1966 | ||
1967 | return 0; | |
1968 | } | |
1969 | ||
a06ea964 NC |
1970 | /* The instruction written: |
1971 | LSL <Xd>, <Xn>, #<shift> | |
1972 | is equivalent to: | |
1973 | UBFM <Xd>, <Xn>, #((64-<shift>)&0x3f), #(63-<shift>). */ | |
1974 | ||
1975 | static int | |
1976 | convert_ubfm_to_lsl (aarch64_inst *inst) | |
1977 | { | |
1978 | int64_t immr = inst->operands[2].imm.value; | |
1979 | int64_t imms = inst->operands[3].imm.value; | |
1980 | int64_t val | |
1981 | = inst->operands[2].qualifier == AARCH64_OPND_QLF_imm_0_31 ? 31 : 63; | |
1982 | ||
1983 | if ((immr == 0 && imms == val) || immr == imms + 1) | |
1984 | { | |
1985 | inst->operands[3].type = AARCH64_OPND_NIL; | |
1986 | inst->operands[2].imm.value = val - imms; | |
1987 | return 1; | |
1988 | } | |
1989 | ||
1990 | return 0; | |
1991 | } | |
1992 | ||
1993 | /* CINC <Wd>, <Wn>, <cond> | |
1994 | is equivalent to: | |
68a64283 YZ |
1995 | CSINC <Wd>, <Wn>, <Wn>, invert(<cond>) |
1996 | where <cond> is not AL or NV. */ | |
a06ea964 NC |
1997 | |
1998 | static int | |
1999 | convert_from_csel (aarch64_inst *inst) | |
2000 | { | |
68a64283 YZ |
2001 | if (inst->operands[1].reg.regno == inst->operands[2].reg.regno |
2002 | && (inst->operands[3].cond->value & 0xe) != 0xe) | |
a06ea964 NC |
2003 | { |
2004 | copy_operand_info (inst, 2, 3); | |
2005 | inst->operands[2].cond = get_inverted_cond (inst->operands[3].cond); | |
2006 | inst->operands[3].type = AARCH64_OPND_NIL; | |
2007 | return 1; | |
2008 | } | |
2009 | return 0; | |
2010 | } | |
2011 | ||
2012 | /* CSET <Wd>, <cond> | |
2013 | is equivalent to: | |
68a64283 YZ |
2014 | CSINC <Wd>, WZR, WZR, invert(<cond>) |
2015 | where <cond> is not AL or NV. */ | |
a06ea964 NC |
2016 | |
2017 | static int | |
2018 | convert_csinc_to_cset (aarch64_inst *inst) | |
2019 | { | |
2020 | if (inst->operands[1].reg.regno == 0x1f | |
68a64283 YZ |
2021 | && inst->operands[2].reg.regno == 0x1f |
2022 | && (inst->operands[3].cond->value & 0xe) != 0xe) | |
a06ea964 NC |
2023 | { |
2024 | copy_operand_info (inst, 1, 3); | |
2025 | inst->operands[1].cond = get_inverted_cond (inst->operands[3].cond); | |
2026 | inst->operands[3].type = AARCH64_OPND_NIL; | |
2027 | inst->operands[2].type = AARCH64_OPND_NIL; | |
2028 | return 1; | |
2029 | } | |
2030 | return 0; | |
2031 | } | |
2032 | ||
2033 | /* MOV <Wd>, #<imm> | |
2034 | is equivalent to: | |
2035 | MOVZ <Wd>, #<imm16>, LSL #<shift>. | |
2036 | ||
2037 | A disassembler may output ORR, MOVZ and MOVN as a MOV mnemonic, except when | |
2038 | ORR has an immediate that could be generated by a MOVZ or MOVN instruction, | |
2039 | or where a MOVN has an immediate that could be encoded by MOVZ, or where | |
2040 | MOVZ/MOVN #0 have a shift amount other than LSL #0, in which case the | |
2041 | machine-instruction mnemonic must be used. */ | |
2042 | ||
2043 | static int | |
2044 | convert_movewide_to_mov (aarch64_inst *inst) | |
2045 | { | |
2046 | uint64_t value = inst->operands[1].imm.value; | |
2047 | /* MOVZ/MOVN #0 have a shift amount other than LSL #0. */ | |
2048 | if (value == 0 && inst->operands[1].shifter.amount != 0) | |
2049 | return 0; | |
2050 | inst->operands[1].type = AARCH64_OPND_IMM_MOV; | |
2051 | inst->operands[1].shifter.kind = AARCH64_MOD_NONE; | |
2052 | value <<= inst->operands[1].shifter.amount; | |
2053 | /* As an alias convertor, it has to be clear that the INST->OPCODE | |
2054 | is the opcode of the real instruction. */ | |
2055 | if (inst->opcode->op == OP_MOVN) | |
2056 | { | |
2057 | int is32 = inst->operands[0].qualifier == AARCH64_OPND_QLF_W; | |
2058 | value = ~value; | |
2059 | /* A MOVN has an immediate that could be encoded by MOVZ. */ | |
2060 | if (aarch64_wide_constant_p (value, is32, NULL) == TRUE) | |
2061 | return 0; | |
2062 | } | |
2063 | inst->operands[1].imm.value = value; | |
2064 | inst->operands[1].shifter.amount = 0; | |
2065 | return 1; | |
2066 | } | |
2067 | ||
2068 | /* MOV <Wd>, #<imm> | |
2069 | is equivalent to: | |
2070 | ORR <Wd>, WZR, #<imm>. | |
2071 | ||
2072 | A disassembler may output ORR, MOVZ and MOVN as a MOV mnemonic, except when | |
2073 | ORR has an immediate that could be generated by a MOVZ or MOVN instruction, | |
2074 | or where a MOVN has an immediate that could be encoded by MOVZ, or where | |
2075 | MOVZ/MOVN #0 have a shift amount other than LSL #0, in which case the | |
2076 | machine-instruction mnemonic must be used. */ | |
2077 | ||
2078 | static int | |
2079 | convert_movebitmask_to_mov (aarch64_inst *inst) | |
2080 | { | |
2081 | int is32; | |
2082 | uint64_t value; | |
2083 | ||
2084 | /* Should have been assured by the base opcode value. */ | |
2085 | assert (inst->operands[1].reg.regno == 0x1f); | |
2086 | copy_operand_info (inst, 1, 2); | |
2087 | is32 = inst->operands[0].qualifier == AARCH64_OPND_QLF_W; | |
2088 | inst->operands[1].type = AARCH64_OPND_IMM_MOV; | |
2089 | value = inst->operands[1].imm.value; | |
2090 | /* ORR has an immediate that could be generated by a MOVZ or MOVN | |
2091 | instruction. */ | |
2092 | if (inst->operands[0].reg.regno != 0x1f | |
2093 | && (aarch64_wide_constant_p (value, is32, NULL) == TRUE | |
2094 | || aarch64_wide_constant_p (~value, is32, NULL) == TRUE)) | |
2095 | return 0; | |
2096 | ||
2097 | inst->operands[2].type = AARCH64_OPND_NIL; | |
2098 | return 1; | |
2099 | } | |
2100 | ||
2101 | /* Some alias opcodes are disassembled by being converted from their real-form. | |
2102 | N.B. INST->OPCODE is the real opcode rather than the alias. */ | |
2103 | ||
2104 | static int | |
2105 | convert_to_alias (aarch64_inst *inst, const aarch64_opcode *alias) | |
2106 | { | |
2107 | switch (alias->op) | |
2108 | { | |
2109 | case OP_ASR_IMM: | |
2110 | case OP_LSR_IMM: | |
2111 | return convert_bfm_to_sr (inst); | |
2112 | case OP_LSL_IMM: | |
2113 | return convert_ubfm_to_lsl (inst); | |
2114 | case OP_CINC: | |
2115 | case OP_CINV: | |
2116 | case OP_CNEG: | |
2117 | return convert_from_csel (inst); | |
2118 | case OP_CSET: | |
2119 | case OP_CSETM: | |
2120 | return convert_csinc_to_cset (inst); | |
2121 | case OP_UBFX: | |
2122 | case OP_BFXIL: | |
2123 | case OP_SBFX: | |
2124 | return convert_bfm_to_bfx (inst); | |
2125 | case OP_SBFIZ: | |
2126 | case OP_BFI: | |
2127 | case OP_UBFIZ: | |
2128 | return convert_bfm_to_bfi (inst); | |
d685192a MW |
2129 | case OP_BFC: |
2130 | return convert_bfm_to_bfc (inst); | |
a06ea964 NC |
2131 | case OP_MOV_V: |
2132 | return convert_orr_to_mov (inst); | |
2133 | case OP_MOV_IMM_WIDE: | |
2134 | case OP_MOV_IMM_WIDEN: | |
2135 | return convert_movewide_to_mov (inst); | |
2136 | case OP_MOV_IMM_LOG: | |
2137 | return convert_movebitmask_to_mov (inst); | |
2138 | case OP_ROR_IMM: | |
2139 | return convert_extr_to_ror (inst); | |
e30181a5 YZ |
2140 | case OP_SXTL: |
2141 | case OP_SXTL2: | |
2142 | case OP_UXTL: | |
2143 | case OP_UXTL2: | |
2144 | return convert_shll_to_xtl (inst); | |
a06ea964 NC |
2145 | default: |
2146 | return 0; | |
2147 | } | |
2148 | } | |
2149 | ||
2150 | static int aarch64_opcode_decode (const aarch64_opcode *, const aarch64_insn, | |
2151 | aarch64_inst *, int); | |
2152 | ||
2153 | /* Given the instruction information in *INST, check if the instruction has | |
2154 | any alias form that can be used to represent *INST. If the answer is yes, | |
2155 | update *INST to be in the form of the determined alias. */ | |
2156 | ||
2157 | /* In the opcode description table, the following flags are used in opcode | |
2158 | entries to help establish the relations between the real and alias opcodes: | |
2159 | ||
2160 | F_ALIAS: opcode is an alias | |
2161 | F_HAS_ALIAS: opcode has alias(es) | |
2162 | F_P1 | |
2163 | F_P2 | |
2164 | F_P3: Disassembly preference priority 1-3 (the larger the | |
2165 | higher). If nothing is specified, it is the priority | |
2166 | 0 by default, i.e. the lowest priority. | |
2167 | ||
2168 | Although the relation between the machine and the alias instructions are not | |
2169 | explicitly described, it can be easily determined from the base opcode | |
2170 | values, masks and the flags F_ALIAS and F_HAS_ALIAS in their opcode | |
2171 | description entries: | |
2172 | ||
2173 | The mask of an alias opcode must be equal to or a super-set (i.e. more | |
2174 | constrained) of that of the aliased opcode; so is the base opcode value. | |
2175 | ||
2176 | if (opcode_has_alias (real) && alias_opcode_p (opcode) | |
2177 | && (opcode->mask & real->mask) == real->mask | |
2178 | && (real->mask & opcode->opcode) == (real->mask & real->opcode)) | |
2179 | then OPCODE is an alias of, and only of, the REAL instruction | |
2180 | ||
2181 | The alias relationship is forced flat-structured to keep related algorithm | |
2182 | simple; an opcode entry cannot be flagged with both F_ALIAS and F_HAS_ALIAS. | |
2183 | ||
2184 | During the disassembling, the decoding decision tree (in | |
2185 | opcodes/aarch64-dis-2.c) always returns an machine instruction opcode entry; | |
2186 | if the decoding of such a machine instruction succeeds (and -Mno-aliases is | |
2187 | not specified), the disassembler will check whether there is any alias | |
2188 | instruction exists for this real instruction. If there is, the disassembler | |
2189 | will try to disassemble the 32-bit binary again using the alias's rule, or | |
2190 | try to convert the IR to the form of the alias. In the case of the multiple | |
2191 | aliases, the aliases are tried one by one from the highest priority | |
2192 | (currently the flag F_P3) to the lowest priority (no priority flag), and the | |
2193 | first succeeds first adopted. | |
2194 | ||
2195 | You may ask why there is a need for the conversion of IR from one form to | |
2196 | another in handling certain aliases. This is because on one hand it avoids | |
2197 | adding more operand code to handle unusual encoding/decoding; on other | |
2198 | hand, during the disassembling, the conversion is an effective approach to | |
2199 | check the condition of an alias (as an alias may be adopted only if certain | |
2200 | conditions are met). | |
2201 | ||
2202 | In order to speed up the alias opcode lookup, aarch64-gen has preprocessed | |
2203 | aarch64_opcode_table and generated aarch64_find_alias_opcode and | |
2204 | aarch64_find_next_alias_opcode (in opcodes/aarch64-dis-2.c) to help. */ | |
2205 | ||
2206 | static void | |
2207 | determine_disassembling_preference (struct aarch64_inst *inst) | |
2208 | { | |
2209 | const aarch64_opcode *opcode; | |
2210 | const aarch64_opcode *alias; | |
2211 | ||
2212 | opcode = inst->opcode; | |
2213 | ||
2214 | /* This opcode does not have an alias, so use itself. */ | |
2215 | if (opcode_has_alias (opcode) == FALSE) | |
2216 | return; | |
2217 | ||
2218 | alias = aarch64_find_alias_opcode (opcode); | |
2219 | assert (alias); | |
2220 | ||
2221 | #ifdef DEBUG_AARCH64 | |
2222 | if (debug_dump) | |
2223 | { | |
2224 | const aarch64_opcode *tmp = alias; | |
2225 | printf ("#### LIST orderd: "); | |
2226 | while (tmp) | |
2227 | { | |
2228 | printf ("%s, ", tmp->name); | |
2229 | tmp = aarch64_find_next_alias_opcode (tmp); | |
2230 | } | |
2231 | printf ("\n"); | |
2232 | } | |
2233 | #endif /* DEBUG_AARCH64 */ | |
2234 | ||
2235 | for (; alias; alias = aarch64_find_next_alias_opcode (alias)) | |
2236 | { | |
2237 | DEBUG_TRACE ("try %s", alias->name); | |
35822b38 | 2238 | assert (alias_opcode_p (alias) || opcode_has_alias (opcode)); |
a06ea964 NC |
2239 | |
2240 | /* An alias can be a pseudo opcode which will never be used in the | |
2241 | disassembly, e.g. BIC logical immediate is such a pseudo opcode | |
2242 | aliasing AND. */ | |
2243 | if (pseudo_opcode_p (alias)) | |
2244 | { | |
2245 | DEBUG_TRACE ("skip pseudo %s", alias->name); | |
2246 | continue; | |
2247 | } | |
2248 | ||
2249 | if ((inst->value & alias->mask) != alias->opcode) | |
2250 | { | |
2251 | DEBUG_TRACE ("skip %s as base opcode not match", alias->name); | |
2252 | continue; | |
2253 | } | |
2254 | /* No need to do any complicated transformation on operands, if the alias | |
2255 | opcode does not have any operand. */ | |
2256 | if (aarch64_num_of_operands (alias) == 0 && alias->opcode == inst->value) | |
2257 | { | |
2258 | DEBUG_TRACE ("succeed with 0-operand opcode %s", alias->name); | |
2259 | aarch64_replace_opcode (inst, alias); | |
2260 | return; | |
2261 | } | |
2262 | if (alias->flags & F_CONV) | |
2263 | { | |
2264 | aarch64_inst copy; | |
2265 | memcpy (©, inst, sizeof (aarch64_inst)); | |
2266 | /* ALIAS is the preference as long as the instruction can be | |
2267 | successfully converted to the form of ALIAS. */ | |
2268 | if (convert_to_alias (©, alias) == 1) | |
2269 | { | |
2270 | aarch64_replace_opcode (©, alias); | |
2271 | assert (aarch64_match_operands_constraint (©, NULL)); | |
2272 | DEBUG_TRACE ("succeed with %s via conversion", alias->name); | |
2273 | memcpy (inst, ©, sizeof (aarch64_inst)); | |
2274 | return; | |
2275 | } | |
2276 | } | |
2277 | else | |
2278 | { | |
2279 | /* Directly decode the alias opcode. */ | |
2280 | aarch64_inst temp; | |
2281 | memset (&temp, '\0', sizeof (aarch64_inst)); | |
2282 | if (aarch64_opcode_decode (alias, inst->value, &temp, 1) == 1) | |
2283 | { | |
2284 | DEBUG_TRACE ("succeed with %s via direct decoding", alias->name); | |
2285 | memcpy (inst, &temp, sizeof (aarch64_inst)); | |
2286 | return; | |
2287 | } | |
2288 | } | |
2289 | } | |
2290 | } | |
2291 | ||
2292 | /* Decode the CODE according to OPCODE; fill INST. Return 0 if the decoding | |
2293 | fails, which meanes that CODE is not an instruction of OPCODE; otherwise | |
2294 | return 1. | |
2295 | ||
2296 | If OPCODE has alias(es) and NOALIASES_P is 0, an alias opcode may be | |
2297 | determined and used to disassemble CODE; this is done just before the | |
2298 | return. */ | |
2299 | ||
2300 | static int | |
2301 | aarch64_opcode_decode (const aarch64_opcode *opcode, const aarch64_insn code, | |
2302 | aarch64_inst *inst, int noaliases_p) | |
2303 | { | |
2304 | int i; | |
2305 | ||
2306 | DEBUG_TRACE ("enter with %s", opcode->name); | |
2307 | ||
2308 | assert (opcode && inst); | |
2309 | ||
2310 | /* Check the base opcode. */ | |
2311 | if ((code & opcode->mask) != (opcode->opcode & opcode->mask)) | |
2312 | { | |
2313 | DEBUG_TRACE ("base opcode match FAIL"); | |
2314 | goto decode_fail; | |
2315 | } | |
2316 | ||
2317 | /* Clear inst. */ | |
2318 | memset (inst, '\0', sizeof (aarch64_inst)); | |
2319 | ||
2320 | inst->opcode = opcode; | |
2321 | inst->value = code; | |
2322 | ||
2323 | /* Assign operand codes and indexes. */ | |
2324 | for (i = 0; i < AARCH64_MAX_OPND_NUM; ++i) | |
2325 | { | |
2326 | if (opcode->operands[i] == AARCH64_OPND_NIL) | |
2327 | break; | |
2328 | inst->operands[i].type = opcode->operands[i]; | |
2329 | inst->operands[i].idx = i; | |
2330 | } | |
2331 | ||
2332 | /* Call the opcode decoder indicated by flags. */ | |
2333 | if (opcode_has_special_coder (opcode) && do_special_decoding (inst) == 0) | |
2334 | { | |
2335 | DEBUG_TRACE ("opcode flag-based decoder FAIL"); | |
2336 | goto decode_fail; | |
2337 | } | |
2338 | ||
2339 | /* Call operand decoders. */ | |
2340 | for (i = 0; i < AARCH64_MAX_OPND_NUM; ++i) | |
2341 | { | |
2342 | const aarch64_operand *opnd; | |
2343 | enum aarch64_opnd type; | |
4bd13cde | 2344 | |
a06ea964 NC |
2345 | type = opcode->operands[i]; |
2346 | if (type == AARCH64_OPND_NIL) | |
2347 | break; | |
2348 | opnd = &aarch64_operands[type]; | |
2349 | if (operand_has_extractor (opnd) | |
2350 | && (! aarch64_extract_operand (opnd, &inst->operands[i], code, inst))) | |
2351 | { | |
2352 | DEBUG_TRACE ("operand decoder FAIL at operand %d", i); | |
2353 | goto decode_fail; | |
2354 | } | |
2355 | } | |
2356 | ||
4bd13cde NC |
2357 | /* If the opcode has a verifier, then check it now. */ |
2358 | if (opcode->verifier && ! opcode->verifier (opcode, code)) | |
2359 | { | |
2360 | DEBUG_TRACE ("operand verifier FAIL"); | |
2361 | goto decode_fail; | |
2362 | } | |
2363 | ||
a06ea964 NC |
2364 | /* Match the qualifiers. */ |
2365 | if (aarch64_match_operands_constraint (inst, NULL) == 1) | |
2366 | { | |
2367 | /* Arriving here, the CODE has been determined as a valid instruction | |
2368 | of OPCODE and *INST has been filled with information of this OPCODE | |
2369 | instruction. Before the return, check if the instruction has any | |
2370 | alias and should be disassembled in the form of its alias instead. | |
2371 | If the answer is yes, *INST will be updated. */ | |
2372 | if (!noaliases_p) | |
2373 | determine_disassembling_preference (inst); | |
2374 | DEBUG_TRACE ("SUCCESS"); | |
2375 | return 1; | |
2376 | } | |
2377 | else | |
2378 | { | |
2379 | DEBUG_TRACE ("constraint matching FAIL"); | |
2380 | } | |
2381 | ||
2382 | decode_fail: | |
2383 | return 0; | |
2384 | } | |
2385 | \f | |
2386 | /* This does some user-friendly fix-up to *INST. It is currently focus on | |
2387 | the adjustment of qualifiers to help the printed instruction | |
2388 | recognized/understood more easily. */ | |
2389 | ||
2390 | static void | |
2391 | user_friendly_fixup (aarch64_inst *inst) | |
2392 | { | |
2393 | switch (inst->opcode->iclass) | |
2394 | { | |
2395 | case testbranch: | |
2396 | /* TBNZ Xn|Wn, #uimm6, label | |
2397 | Test and Branch Not Zero: conditionally jumps to label if bit number | |
2398 | uimm6 in register Xn is not zero. The bit number implies the width of | |
2399 | the register, which may be written and should be disassembled as Wn if | |
2400 | uimm is less than 32. Limited to a branch offset range of +/- 32KiB. | |
2401 | */ | |
2402 | if (inst->operands[1].imm.value < 32) | |
2403 | inst->operands[0].qualifier = AARCH64_OPND_QLF_W; | |
2404 | break; | |
2405 | default: break; | |
2406 | } | |
2407 | } | |
2408 | ||
43cdf5ae YQ |
2409 | /* Decode INSN and fill in *INST the instruction information. An alias |
2410 | opcode may be filled in *INSN if NOALIASES_P is FALSE. Return zero on | |
2411 | success. */ | |
a06ea964 | 2412 | |
36f4aab1 | 2413 | int |
43cdf5ae YQ |
2414 | aarch64_decode_insn (aarch64_insn insn, aarch64_inst *inst, |
2415 | bfd_boolean noaliases_p) | |
a06ea964 NC |
2416 | { |
2417 | const aarch64_opcode *opcode = aarch64_opcode_lookup (insn); | |
2418 | ||
2419 | #ifdef DEBUG_AARCH64 | |
2420 | if (debug_dump) | |
2421 | { | |
2422 | const aarch64_opcode *tmp = opcode; | |
2423 | printf ("\n"); | |
2424 | DEBUG_TRACE ("opcode lookup:"); | |
2425 | while (tmp != NULL) | |
2426 | { | |
2427 | aarch64_verbose (" %s", tmp->name); | |
2428 | tmp = aarch64_find_next_opcode (tmp); | |
2429 | } | |
2430 | } | |
2431 | #endif /* DEBUG_AARCH64 */ | |
2432 | ||
2433 | /* A list of opcodes may have been found, as aarch64_opcode_lookup cannot | |
2434 | distinguish some opcodes, e.g. SSHR and MOVI, which almost share the same | |
2435 | opcode field and value, apart from the difference that one of them has an | |
2436 | extra field as part of the opcode, but such a field is used for operand | |
2437 | encoding in other opcode(s) ('immh' in the case of the example). */ | |
2438 | while (opcode != NULL) | |
2439 | { | |
2440 | /* But only one opcode can be decoded successfully for, as the | |
2441 | decoding routine will check the constraint carefully. */ | |
43cdf5ae | 2442 | if (aarch64_opcode_decode (opcode, insn, inst, noaliases_p) == 1) |
a06ea964 NC |
2443 | return ERR_OK; |
2444 | opcode = aarch64_find_next_opcode (opcode); | |
2445 | } | |
2446 | ||
2447 | return ERR_UND; | |
2448 | } | |
2449 | ||
2450 | /* Print operands. */ | |
2451 | ||
2452 | static void | |
2453 | print_operands (bfd_vma pc, const aarch64_opcode *opcode, | |
2454 | const aarch64_opnd_info *opnds, struct disassemble_info *info) | |
2455 | { | |
2456 | int i, pcrel_p, num_printed; | |
2457 | for (i = 0, num_printed = 0; i < AARCH64_MAX_OPND_NUM; ++i) | |
2458 | { | |
0d2f91fe | 2459 | char str[128]; |
a06ea964 NC |
2460 | /* We regard the opcode operand info more, however we also look into |
2461 | the inst->operands to support the disassembling of the optional | |
2462 | operand. | |
2463 | The two operand code should be the same in all cases, apart from | |
2464 | when the operand can be optional. */ | |
2465 | if (opcode->operands[i] == AARCH64_OPND_NIL | |
2466 | || opnds[i].type == AARCH64_OPND_NIL) | |
2467 | break; | |
2468 | ||
2469 | /* Generate the operand string in STR. */ | |
0d2f91fe | 2470 | aarch64_print_operand (str, sizeof (str), pc, opcode, opnds, i, &pcrel_p, |
a06ea964 NC |
2471 | &info->target); |
2472 | ||
2473 | /* Print the delimiter (taking account of omitted operand(s)). */ | |
2474 | if (str[0] != '\0') | |
2475 | (*info->fprintf_func) (info->stream, "%s", | |
2476 | num_printed++ == 0 ? "\t" : ", "); | |
2477 | ||
2478 | /* Print the operand. */ | |
2479 | if (pcrel_p) | |
2480 | (*info->print_address_func) (info->target, info); | |
2481 | else | |
2482 | (*info->fprintf_func) (info->stream, "%s", str); | |
2483 | } | |
2484 | } | |
2485 | ||
2486 | /* Print the instruction mnemonic name. */ | |
2487 | ||
2488 | static void | |
2489 | print_mnemonic_name (const aarch64_inst *inst, struct disassemble_info *info) | |
2490 | { | |
2491 | if (inst->opcode->flags & F_COND) | |
2492 | { | |
2493 | /* For instructions that are truly conditionally executed, e.g. b.cond, | |
2494 | prepare the full mnemonic name with the corresponding condition | |
2495 | suffix. */ | |
2496 | char name[8], *ptr; | |
2497 | size_t len; | |
2498 | ||
2499 | ptr = strchr (inst->opcode->name, '.'); | |
2500 | assert (ptr && inst->cond); | |
2501 | len = ptr - inst->opcode->name; | |
2502 | assert (len < 8); | |
2503 | strncpy (name, inst->opcode->name, len); | |
2504 | name [len] = '\0'; | |
2505 | (*info->fprintf_func) (info->stream, "%s.%s", name, inst->cond->names[0]); | |
2506 | } | |
2507 | else | |
2508 | (*info->fprintf_func) (info->stream, "%s", inst->opcode->name); | |
2509 | } | |
2510 | ||
2511 | /* Print the instruction according to *INST. */ | |
2512 | ||
2513 | static void | |
2514 | print_aarch64_insn (bfd_vma pc, const aarch64_inst *inst, | |
2515 | struct disassemble_info *info) | |
2516 | { | |
2517 | print_mnemonic_name (inst, info); | |
2518 | print_operands (pc, inst->opcode, inst->operands, info); | |
2519 | } | |
2520 | ||
2521 | /* Entry-point of the instruction disassembler and printer. */ | |
2522 | ||
2523 | static void | |
2524 | print_insn_aarch64_word (bfd_vma pc, | |
2525 | uint32_t word, | |
2526 | struct disassemble_info *info) | |
2527 | { | |
2528 | static const char *err_msg[6] = | |
2529 | { | |
2530 | [ERR_OK] = "_", | |
2531 | [-ERR_UND] = "undefined", | |
2532 | [-ERR_UNP] = "unpredictable", | |
2533 | [-ERR_NYI] = "NYI" | |
2534 | }; | |
2535 | ||
2536 | int ret; | |
2537 | aarch64_inst inst; | |
2538 | ||
2539 | info->insn_info_valid = 1; | |
2540 | info->branch_delay_insns = 0; | |
2541 | info->data_size = 0; | |
2542 | info->target = 0; | |
2543 | info->target2 = 0; | |
2544 | ||
2545 | if (info->flags & INSN_HAS_RELOC) | |
2546 | /* If the instruction has a reloc associated with it, then | |
2547 | the offset field in the instruction will actually be the | |
2548 | addend for the reloc. (If we are using REL type relocs). | |
2549 | In such cases, we can ignore the pc when computing | |
2550 | addresses, since the addend is not currently pc-relative. */ | |
2551 | pc = 0; | |
2552 | ||
43cdf5ae | 2553 | ret = aarch64_decode_insn (word, &inst, no_aliases); |
a06ea964 NC |
2554 | |
2555 | if (((word >> 21) & 0x3ff) == 1) | |
2556 | { | |
2557 | /* RESERVED for ALES. */ | |
2558 | assert (ret != ERR_OK); | |
2559 | ret = ERR_NYI; | |
2560 | } | |
2561 | ||
2562 | switch (ret) | |
2563 | { | |
2564 | case ERR_UND: | |
2565 | case ERR_UNP: | |
2566 | case ERR_NYI: | |
2567 | /* Handle undefined instructions. */ | |
2568 | info->insn_type = dis_noninsn; | |
2569 | (*info->fprintf_func) (info->stream,".inst\t0x%08x ; %s", | |
2570 | word, err_msg[-ret]); | |
2571 | break; | |
2572 | case ERR_OK: | |
2573 | user_friendly_fixup (&inst); | |
2574 | print_aarch64_insn (pc, &inst, info); | |
2575 | break; | |
2576 | default: | |
2577 | abort (); | |
2578 | } | |
2579 | } | |
2580 | ||
2581 | /* Disallow mapping symbols ($x, $d etc) from | |
2582 | being displayed in symbol relative addresses. */ | |
2583 | ||
2584 | bfd_boolean | |
2585 | aarch64_symbol_is_valid (asymbol * sym, | |
2586 | struct disassemble_info * info ATTRIBUTE_UNUSED) | |
2587 | { | |
2588 | const char * name; | |
2589 | ||
2590 | if (sym == NULL) | |
2591 | return FALSE; | |
2592 | ||
2593 | name = bfd_asymbol_name (sym); | |
2594 | ||
2595 | return name | |
2596 | && (name[0] != '$' | |
2597 | || (name[1] != 'x' && name[1] != 'd') | |
2598 | || (name[2] != '\0' && name[2] != '.')); | |
2599 | } | |
2600 | ||
2601 | /* Print data bytes on INFO->STREAM. */ | |
2602 | ||
2603 | static void | |
2604 | print_insn_data (bfd_vma pc ATTRIBUTE_UNUSED, | |
2605 | uint32_t word, | |
2606 | struct disassemble_info *info) | |
2607 | { | |
2608 | switch (info->bytes_per_chunk) | |
2609 | { | |
2610 | case 1: | |
2611 | info->fprintf_func (info->stream, ".byte\t0x%02x", word); | |
2612 | break; | |
2613 | case 2: | |
2614 | info->fprintf_func (info->stream, ".short\t0x%04x", word); | |
2615 | break; | |
2616 | case 4: | |
2617 | info->fprintf_func (info->stream, ".word\t0x%08x", word); | |
2618 | break; | |
2619 | default: | |
2620 | abort (); | |
2621 | } | |
2622 | } | |
2623 | ||
2624 | /* Try to infer the code or data type from a symbol. | |
2625 | Returns nonzero if *MAP_TYPE was set. */ | |
2626 | ||
2627 | static int | |
2628 | get_sym_code_type (struct disassemble_info *info, int n, | |
2629 | enum map_type *map_type) | |
2630 | { | |
2631 | elf_symbol_type *es; | |
2632 | unsigned int type; | |
2633 | const char *name; | |
2634 | ||
2635 | es = *(elf_symbol_type **)(info->symtab + n); | |
2636 | type = ELF_ST_TYPE (es->internal_elf_sym.st_info); | |
2637 | ||
2638 | /* If the symbol has function type then use that. */ | |
2639 | if (type == STT_FUNC) | |
2640 | { | |
2641 | *map_type = MAP_INSN; | |
2642 | return TRUE; | |
2643 | } | |
2644 | ||
2645 | /* Check for mapping symbols. */ | |
2646 | name = bfd_asymbol_name(info->symtab[n]); | |
2647 | if (name[0] == '$' | |
2648 | && (name[1] == 'x' || name[1] == 'd') | |
2649 | && (name[2] == '\0' || name[2] == '.')) | |
2650 | { | |
2651 | *map_type = (name[1] == 'x' ? MAP_INSN : MAP_DATA); | |
2652 | return TRUE; | |
2653 | } | |
2654 | ||
2655 | return FALSE; | |
2656 | } | |
2657 | ||
2658 | /* Entry-point of the AArch64 disassembler. */ | |
2659 | ||
2660 | int | |
2661 | print_insn_aarch64 (bfd_vma pc, | |
2662 | struct disassemble_info *info) | |
2663 | { | |
2664 | bfd_byte buffer[INSNLEN]; | |
2665 | int status; | |
2666 | void (*printer) (bfd_vma, uint32_t, struct disassemble_info *); | |
2667 | bfd_boolean found = FALSE; | |
2668 | unsigned int size = 4; | |
2669 | unsigned long data; | |
2670 | ||
2671 | if (info->disassembler_options) | |
2672 | { | |
2673 | set_default_aarch64_dis_options (info); | |
2674 | ||
2675 | parse_aarch64_dis_options (info->disassembler_options); | |
2676 | ||
2677 | /* To avoid repeated parsing of these options, we remove them here. */ | |
2678 | info->disassembler_options = NULL; | |
2679 | } | |
2680 | ||
2681 | /* Aarch64 instructions are always little-endian */ | |
2682 | info->endian_code = BFD_ENDIAN_LITTLE; | |
2683 | ||
2684 | /* First check the full symtab for a mapping symbol, even if there | |
2685 | are no usable non-mapping symbols for this address. */ | |
2686 | if (info->symtab_size != 0 | |
2687 | && bfd_asymbol_flavour (*info->symtab) == bfd_target_elf_flavour) | |
2688 | { | |
2689 | enum map_type type = MAP_INSN; | |
2690 | int last_sym = -1; | |
2691 | bfd_vma addr; | |
2692 | int n; | |
2693 | ||
2694 | if (pc <= last_mapping_addr) | |
2695 | last_mapping_sym = -1; | |
2696 | ||
2697 | /* Start scanning at the start of the function, or wherever | |
2698 | we finished last time. */ | |
2699 | n = info->symtab_pos + 1; | |
2700 | if (n < last_mapping_sym) | |
2701 | n = last_mapping_sym; | |
2702 | ||
2703 | /* Scan up to the location being disassembled. */ | |
2704 | for (; n < info->symtab_size; n++) | |
2705 | { | |
2706 | addr = bfd_asymbol_value (info->symtab[n]); | |
2707 | if (addr > pc) | |
2708 | break; | |
2709 | if ((info->section == NULL | |
2710 | || info->section == info->symtab[n]->section) | |
2711 | && get_sym_code_type (info, n, &type)) | |
2712 | { | |
2713 | last_sym = n; | |
2714 | found = TRUE; | |
2715 | } | |
2716 | } | |
2717 | ||
2718 | if (!found) | |
2719 | { | |
2720 | n = info->symtab_pos; | |
2721 | if (n < last_mapping_sym) | |
2722 | n = last_mapping_sym; | |
2723 | ||
2724 | /* No mapping symbol found at this address. Look backwards | |
2725 | for a preceeding one. */ | |
2726 | for (; n >= 0; n--) | |
2727 | { | |
2728 | if (get_sym_code_type (info, n, &type)) | |
2729 | { | |
2730 | last_sym = n; | |
2731 | found = TRUE; | |
2732 | break; | |
2733 | } | |
2734 | } | |
2735 | } | |
2736 | ||
2737 | last_mapping_sym = last_sym; | |
2738 | last_type = type; | |
2739 | ||
2740 | /* Look a little bit ahead to see if we should print out | |
2741 | less than four bytes of data. If there's a symbol, | |
2742 | mapping or otherwise, after two bytes then don't | |
2743 | print more. */ | |
2744 | if (last_type == MAP_DATA) | |
2745 | { | |
2746 | size = 4 - (pc & 3); | |
2747 | for (n = last_sym + 1; n < info->symtab_size; n++) | |
2748 | { | |
2749 | addr = bfd_asymbol_value (info->symtab[n]); | |
2750 | if (addr > pc) | |
2751 | { | |
2752 | if (addr - pc < size) | |
2753 | size = addr - pc; | |
2754 | break; | |
2755 | } | |
2756 | } | |
2757 | /* If the next symbol is after three bytes, we need to | |
2758 | print only part of the data, so that we can use either | |
2759 | .byte or .short. */ | |
2760 | if (size == 3) | |
2761 | size = (pc & 1) ? 1 : 2; | |
2762 | } | |
2763 | } | |
2764 | ||
2765 | if (last_type == MAP_DATA) | |
2766 | { | |
2767 | /* size was set above. */ | |
2768 | info->bytes_per_chunk = size; | |
2769 | info->display_endian = info->endian; | |
2770 | printer = print_insn_data; | |
2771 | } | |
2772 | else | |
2773 | { | |
2774 | info->bytes_per_chunk = size = INSNLEN; | |
2775 | info->display_endian = info->endian_code; | |
2776 | printer = print_insn_aarch64_word; | |
2777 | } | |
2778 | ||
2779 | status = (*info->read_memory_func) (pc, buffer, size, info); | |
2780 | if (status != 0) | |
2781 | { | |
2782 | (*info->memory_error_func) (status, pc, info); | |
2783 | return -1; | |
2784 | } | |
2785 | ||
2786 | data = bfd_get_bits (buffer, size * 8, | |
2787 | info->display_endian == BFD_ENDIAN_BIG); | |
2788 | ||
2789 | (*printer) (pc, data, info); | |
2790 | ||
2791 | return size; | |
2792 | } | |
2793 | \f | |
2794 | void | |
2795 | print_aarch64_disassembler_options (FILE *stream) | |
2796 | { | |
2797 | fprintf (stream, _("\n\ | |
2798 | The following AARCH64 specific disassembler options are supported for use\n\ | |
2799 | with the -M switch (multiple options should be separated by commas):\n")); | |
2800 | ||
2801 | fprintf (stream, _("\n\ | |
2802 | no-aliases Don't print instruction aliases.\n")); | |
2803 | ||
2804 | fprintf (stream, _("\n\ | |
2805 | aliases Do print instruction aliases.\n")); | |
2806 | ||
2807 | #ifdef DEBUG_AARCH64 | |
2808 | fprintf (stream, _("\n\ | |
2809 | debug_dump Temp switch for debug trace.\n")); | |
2810 | #endif /* DEBUG_AARCH64 */ | |
2811 | ||
2812 | fprintf (stream, _("\n")); | |
2813 | } |