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1 | /* aarch64-asm.c -- AArch64 assembler support. |
2 | Copyright 2012 Free Software Foundation, Inc. | |
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 <stdarg.h> | |
23 | #include "aarch64-asm.h" | |
24 | ||
25 | /* Utilities. */ | |
26 | ||
27 | /* The unnamed arguments consist of the number of fields and information about | |
28 | these fields where the VALUE will be inserted into CODE. MASK can be zero or | |
29 | the base mask of the opcode. | |
30 | ||
31 | N.B. the fields are required to be in such an order than the least signficant | |
32 | field for VALUE comes the first, e.g. the <index> in | |
33 | SQDMLAL <Va><d>, <Vb><n>, <Vm>.<Ts>[<index>] | |
34 | is encoded in H:L:M in some cases, the the fields H:L:M should be passed in | |
35 | the order of M, L, H. */ | |
36 | ||
37 | static inline void | |
38 | insert_fields (aarch64_insn *code, aarch64_insn value, aarch64_insn mask, ...) | |
39 | { | |
40 | uint32_t num; | |
41 | const aarch64_field *field; | |
42 | enum aarch64_field_kind kind; | |
43 | va_list va; | |
44 | ||
45 | va_start (va, mask); | |
46 | num = va_arg (va, uint32_t); | |
47 | assert (num <= 5); | |
48 | while (num--) | |
49 | { | |
50 | kind = va_arg (va, enum aarch64_field_kind); | |
51 | field = &fields[kind]; | |
52 | insert_field (kind, code, value, mask); | |
53 | value >>= field->width; | |
54 | } | |
55 | va_end (va); | |
56 | } | |
57 | ||
58 | /* Operand inserters. */ | |
59 | ||
60 | /* Insert register number. */ | |
61 | const char * | |
62 | aarch64_ins_regno (const aarch64_operand *self, const aarch64_opnd_info *info, | |
63 | aarch64_insn *code, | |
64 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
65 | { | |
66 | insert_field (self->fields[0], code, info->reg.regno, 0); | |
67 | return NULL; | |
68 | } | |
69 | ||
70 | /* Insert register number, index and/or other data for SIMD register element | |
71 | operand, e.g. the last source operand in | |
72 | SQDMLAL <Va><d>, <Vb><n>, <Vm>.<Ts>[<index>]. */ | |
73 | const char * | |
74 | aarch64_ins_reglane (const aarch64_operand *self, const aarch64_opnd_info *info, | |
75 | aarch64_insn *code, const aarch64_inst *inst) | |
76 | { | |
77 | /* regno */ | |
78 | insert_field (self->fields[0], code, info->reglane.regno, inst->opcode->mask); | |
79 | /* index and/or type */ | |
80 | if (inst->opcode->iclass == asisdone || inst->opcode->iclass == asimdins) | |
81 | { | |
82 | int pos = info->qualifier - AARCH64_OPND_QLF_S_B; | |
83 | if (info->type == AARCH64_OPND_En | |
84 | && inst->opcode->operands[0] == AARCH64_OPND_Ed) | |
85 | { | |
86 | /* index2 for e.g. INS <Vd>.<Ts>[<index1>], <Vn>.<Ts>[<index2>]. */ | |
87 | assert (info->idx == 1); /* Vn */ | |
88 | aarch64_insn value = info->reglane.index << pos; | |
89 | insert_field (FLD_imm4, code, value, 0); | |
90 | } | |
91 | else | |
92 | { | |
93 | /* index and type for e.g. DUP <V><d>, <Vn>.<T>[<index>]. | |
94 | imm5<3:0> <V> | |
95 | 0000 RESERVED | |
96 | xxx1 B | |
97 | xx10 H | |
98 | x100 S | |
99 | 1000 D */ | |
100 | aarch64_insn value = ((info->reglane.index << 1) | 1) << pos; | |
101 | insert_field (FLD_imm5, code, value, 0); | |
102 | } | |
103 | } | |
104 | else | |
105 | { | |
106 | /* index for e.g. SQDMLAL <Va><d>, <Vb><n>, <Vm>.<Ts>[<index>] | |
107 | or SQDMLAL <Va><d>, <Vb><n>, <Vm>.<Ts>[<index>]. */ | |
108 | switch (info->qualifier) | |
109 | { | |
110 | case AARCH64_OPND_QLF_S_H: | |
111 | /* H:L:M */ | |
112 | insert_fields (code, info->reglane.index, 0, 3, FLD_M, FLD_L, FLD_H); | |
113 | break; | |
114 | case AARCH64_OPND_QLF_S_S: | |
115 | /* H:L */ | |
116 | insert_fields (code, info->reglane.index, 0, 2, FLD_L, FLD_H); | |
117 | break; | |
118 | case AARCH64_OPND_QLF_S_D: | |
119 | /* H */ | |
120 | insert_field (FLD_H, code, info->reglane.index, 0); | |
121 | break; | |
122 | default: | |
123 | assert (0); | |
124 | } | |
125 | } | |
126 | return NULL; | |
127 | } | |
128 | ||
129 | /* Insert regno and len field of a register list operand, e.g. Vn in TBL. */ | |
130 | const char * | |
131 | aarch64_ins_reglist (const aarch64_operand *self, const aarch64_opnd_info *info, | |
132 | aarch64_insn *code, | |
133 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
134 | { | |
135 | /* R */ | |
136 | insert_field (self->fields[0], code, info->reglist.first_regno, 0); | |
137 | /* len */ | |
138 | insert_field (FLD_len, code, info->reglist.num_regs - 1, 0); | |
139 | return NULL; | |
140 | } | |
141 | ||
142 | /* Insert Rt and opcode fields for a register list operand, e.g. Vt | |
143 | in AdvSIMD load/store instructions. */ | |
144 | const char * | |
145 | aarch64_ins_ldst_reglist (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
146 | const aarch64_opnd_info *info, aarch64_insn *code, | |
147 | const aarch64_inst *inst) | |
148 | { | |
149 | aarch64_insn value; | |
150 | /* Number of elements in each structure to be loaded/stored. */ | |
151 | unsigned num = get_opcode_dependent_value (inst->opcode); | |
152 | ||
153 | /* Rt */ | |
154 | insert_field (FLD_Rt, code, info->reglist.first_regno, 0); | |
155 | /* opcode */ | |
156 | switch (num) | |
157 | { | |
158 | case 1: | |
159 | switch (info->reglist.num_regs) | |
160 | { | |
161 | case 1: value = 0x7; break; | |
162 | case 2: value = 0xa; break; | |
163 | case 3: value = 0x6; break; | |
164 | case 4: value = 0x2; break; | |
165 | default: assert (0); | |
166 | } | |
167 | break; | |
168 | case 2: | |
169 | value = info->reglist.num_regs == 4 ? 0x3 : 0x8; | |
170 | break; | |
171 | case 3: | |
172 | value = 0x4; | |
173 | break; | |
174 | case 4: | |
175 | value = 0x0; | |
176 | break; | |
177 | default: | |
178 | assert (0); | |
179 | } | |
180 | insert_field (FLD_opcode, code, value, 0); | |
181 | ||
182 | return NULL; | |
183 | } | |
184 | ||
185 | /* Insert Rt and S fields for a register list operand, e.g. Vt in AdvSIMD load | |
186 | single structure to all lanes instructions. */ | |
187 | const char * | |
188 | aarch64_ins_ldst_reglist_r (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
189 | const aarch64_opnd_info *info, aarch64_insn *code, | |
190 | const aarch64_inst *inst) | |
191 | { | |
192 | aarch64_insn value; | |
193 | /* The opcode dependent area stores the number of elements in | |
194 | each structure to be loaded/stored. */ | |
195 | int is_ld1r = get_opcode_dependent_value (inst->opcode) == 1; | |
196 | ||
197 | /* Rt */ | |
198 | insert_field (FLD_Rt, code, info->reglist.first_regno, 0); | |
199 | /* S */ | |
200 | value = (aarch64_insn) 0; | |
201 | if (is_ld1r && info->reglist.num_regs == 2) | |
202 | /* OP_LD1R does not have alternating variant, but have "two consecutive" | |
203 | instead. */ | |
204 | value = (aarch64_insn) 1; | |
205 | insert_field (FLD_S, code, value, 0); | |
206 | ||
207 | return NULL; | |
208 | } | |
209 | ||
210 | /* Insert Q, opcode<2:1>, S, size and Rt fields for a register element list | |
211 | operand e.g. Vt in AdvSIMD load/store single element instructions. */ | |
212 | const char * | |
213 | aarch64_ins_ldst_elemlist (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
214 | const aarch64_opnd_info *info, aarch64_insn *code, | |
215 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
216 | { | |
217 | aarch64_field field = {0, 0}; | |
218 | aarch64_insn QSsize; /* fields Q:S:size. */ | |
219 | aarch64_insn opcodeh2; /* opcode<2:1> */ | |
220 | ||
221 | assert (info->reglist.has_index); | |
222 | ||
223 | /* Rt */ | |
224 | insert_field (FLD_Rt, code, info->reglist.first_regno, 0); | |
225 | /* Encode the index, opcode<2:1> and size. */ | |
226 | switch (info->qualifier) | |
227 | { | |
228 | case AARCH64_OPND_QLF_S_B: | |
229 | /* Index encoded in "Q:S:size". */ | |
230 | QSsize = info->reglist.index; | |
231 | opcodeh2 = 0x0; | |
232 | break; | |
233 | case AARCH64_OPND_QLF_S_H: | |
234 | /* Index encoded in "Q:S:size<1>". */ | |
235 | QSsize = info->reglist.index << 1; | |
236 | opcodeh2 = 0x1; | |
237 | break; | |
238 | case AARCH64_OPND_QLF_S_S: | |
239 | /* Index encoded in "Q:S". */ | |
240 | QSsize = info->reglist.index << 2; | |
241 | opcodeh2 = 0x2; | |
242 | break; | |
243 | case AARCH64_OPND_QLF_S_D: | |
244 | /* Index encoded in "Q". */ | |
245 | QSsize = info->reglist.index << 3 | 0x1; | |
246 | opcodeh2 = 0x2; | |
247 | break; | |
248 | default: | |
249 | assert (0); | |
250 | } | |
251 | insert_fields (code, QSsize, 0, 3, FLD_vldst_size, FLD_S, FLD_Q); | |
252 | gen_sub_field (FLD_asisdlso_opcode, 1, 2, &field); | |
253 | insert_field_2 (&field, code, opcodeh2, 0); | |
254 | ||
255 | return NULL; | |
256 | } | |
257 | ||
258 | /* Insert fields immh:immb and/or Q for e.g. the shift immediate in | |
259 | SSHR <Vd>.<T>, <Vn>.<T>, #<shift> | |
260 | or SSHR <V><d>, <V><n>, #<shift>. */ | |
261 | const char * | |
262 | aarch64_ins_advsimd_imm_shift (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
263 | const aarch64_opnd_info *info, | |
264 | aarch64_insn *code, const aarch64_inst *inst) | |
265 | { | |
266 | unsigned val = aarch64_get_qualifier_standard_value (info->qualifier); | |
267 | aarch64_insn Q, imm; | |
268 | ||
269 | if (inst->opcode->iclass == asimdshf) | |
270 | { | |
271 | /* Q | |
272 | immh Q <T> | |
273 | 0000 x SEE AdvSIMD modified immediate | |
274 | 0001 0 8B | |
275 | 0001 1 16B | |
276 | 001x 0 4H | |
277 | 001x 1 8H | |
278 | 01xx 0 2S | |
279 | 01xx 1 4S | |
280 | 1xxx 0 RESERVED | |
281 | 1xxx 1 2D */ | |
282 | Q = (val & 0x1) ? 1 : 0; | |
283 | insert_field (FLD_Q, code, Q, inst->opcode->mask); | |
284 | val >>= 1; | |
285 | } | |
286 | ||
287 | assert (info->type == AARCH64_OPND_IMM_VLSR | |
288 | || info->type == AARCH64_OPND_IMM_VLSL); | |
289 | ||
290 | if (info->type == AARCH64_OPND_IMM_VLSR) | |
291 | /* immh:immb | |
292 | immh <shift> | |
293 | 0000 SEE AdvSIMD modified immediate | |
294 | 0001 (16-UInt(immh:immb)) | |
295 | 001x (32-UInt(immh:immb)) | |
296 | 01xx (64-UInt(immh:immb)) | |
297 | 1xxx (128-UInt(immh:immb)) */ | |
298 | imm = (16 << (unsigned)val) - info->imm.value; | |
299 | else | |
300 | /* immh:immb | |
301 | immh <shift> | |
302 | 0000 SEE AdvSIMD modified immediate | |
303 | 0001 (UInt(immh:immb)-8) | |
304 | 001x (UInt(immh:immb)-16) | |
305 | 01xx (UInt(immh:immb)-32) | |
306 | 1xxx (UInt(immh:immb)-64) */ | |
307 | imm = info->imm.value + (8 << (unsigned)val); | |
308 | insert_fields (code, imm, 0, 2, FLD_immb, FLD_immh); | |
309 | ||
310 | return NULL; | |
311 | } | |
312 | ||
313 | /* Insert fields for e.g. the immediate operands in | |
314 | BFM <Wd>, <Wn>, #<immr>, #<imms>. */ | |
315 | const char * | |
316 | aarch64_ins_imm (const aarch64_operand *self, const aarch64_opnd_info *info, | |
317 | aarch64_insn *code, | |
318 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
319 | { | |
320 | int64_t imm; | |
321 | /* Maximum of two fields to insert. */ | |
322 | assert (self->fields[2] == FLD_NIL); | |
323 | ||
324 | imm = info->imm.value; | |
325 | if (operand_need_shift_by_two (self)) | |
326 | imm >>= 2; | |
327 | if (self->fields[1] == FLD_NIL) | |
328 | insert_field (self->fields[0], code, imm, 0); | |
329 | else | |
330 | /* e.g. TBZ b5:b40. */ | |
331 | insert_fields (code, imm, 0, 2, self->fields[1], self->fields[0]); | |
332 | return NULL; | |
333 | } | |
334 | ||
335 | /* Insert immediate and its shift amount for e.g. the last operand in | |
336 | MOVZ <Wd>, #<imm16>{, LSL #<shift>}. */ | |
337 | const char * | |
338 | aarch64_ins_imm_half (const aarch64_operand *self, const aarch64_opnd_info *info, | |
339 | aarch64_insn *code, | |
340 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
341 | { | |
342 | /* imm16 */ | |
343 | aarch64_ins_imm (self, info, code, inst); | |
344 | /* hw */ | |
345 | insert_field (FLD_hw, code, info->shifter.amount >> 4, 0); | |
346 | return NULL; | |
347 | } | |
348 | ||
349 | /* Insert cmode and "a:b:c:d:e:f:g:h" fields for e.g. the last operand in | |
350 | MOVI <Vd>.<T>, #<imm8> {, LSL #<amount>}. */ | |
351 | const char * | |
352 | aarch64_ins_advsimd_imm_modified (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
353 | const aarch64_opnd_info *info, | |
354 | aarch64_insn *code, | |
355 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
356 | { | |
357 | enum aarch64_opnd_qualifier opnd0_qualifier = inst->operands[0].qualifier; | |
358 | uint64_t imm = info->imm.value; | |
359 | enum aarch64_modifier_kind kind = info->shifter.kind; | |
360 | int amount = info->shifter.amount; | |
361 | aarch64_field field = {0, 0}; | |
362 | ||
363 | /* a:b:c:d:e:f:g:h */ | |
364 | if (!info->imm.is_fp && aarch64_get_qualifier_esize (opnd0_qualifier) == 8) | |
365 | { | |
366 | /* Either MOVI <Dd>, #<imm> | |
367 | or MOVI <Vd>.2D, #<imm>. | |
368 | <imm> is a 64-bit immediate | |
369 | "aaaaaaaabbbbbbbbccccccccddddddddeeeeeeeeffffffffgggggggghhhhhhhh", | |
370 | encoded in "a:b:c:d:e:f:g:h". */ | |
371 | imm = aarch64_shrink_expanded_imm8 (imm); | |
372 | assert ((int)imm >= 0); | |
373 | } | |
374 | assert (imm <= 255); | |
375 | insert_fields (code, imm, 0, 2, FLD_defgh, FLD_abc); | |
376 | ||
377 | if (kind == AARCH64_MOD_NONE) | |
378 | return NULL; | |
379 | ||
380 | /* shift amount partially in cmode */ | |
381 | assert (kind == AARCH64_MOD_LSL || kind == AARCH64_MOD_MSL); | |
382 | if (kind == AARCH64_MOD_LSL) | |
383 | { | |
384 | /* AARCH64_MOD_LSL: shift zeros. */ | |
385 | int esize = aarch64_get_qualifier_esize (opnd0_qualifier); | |
386 | assert (esize == 4 || esize == 2); | |
387 | amount >>= 3; | |
388 | if (esize == 4) | |
389 | gen_sub_field (FLD_cmode, 1, 2, &field); /* per word */ | |
390 | else | |
391 | gen_sub_field (FLD_cmode, 1, 1, &field); /* per halfword */ | |
392 | } | |
393 | else | |
394 | { | |
395 | /* AARCH64_MOD_MSL: shift ones. */ | |
396 | amount >>= 4; | |
397 | gen_sub_field (FLD_cmode, 0, 1, &field); /* per word */ | |
398 | } | |
399 | insert_field_2 (&field, code, amount, 0); | |
400 | ||
401 | return NULL; | |
402 | } | |
403 | ||
404 | /* Insert #<fbits> for the immediate operand in fp fix-point instructions, | |
405 | e.g. SCVTF <Dd>, <Wn>, #<fbits>. */ | |
406 | const char * | |
407 | aarch64_ins_fbits (const aarch64_operand *self, const aarch64_opnd_info *info, | |
408 | aarch64_insn *code, | |
409 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
410 | { | |
411 | insert_field (self->fields[0], code, 64 - info->imm.value, 0); | |
412 | return NULL; | |
413 | } | |
414 | ||
415 | /* Insert arithmetic immediate for e.g. the last operand in | |
416 | SUBS <Wd>, <Wn|WSP>, #<imm> {, <shift>}. */ | |
417 | const char * | |
418 | aarch64_ins_aimm (const aarch64_operand *self, const aarch64_opnd_info *info, | |
419 | aarch64_insn *code, const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
420 | { | |
421 | /* shift */ | |
422 | aarch64_insn value = info->shifter.amount ? 1 : 0; | |
423 | insert_field (self->fields[0], code, value, 0); | |
424 | /* imm12 (unsigned) */ | |
425 | insert_field (self->fields[1], code, info->imm.value, 0); | |
426 | return NULL; | |
427 | } | |
428 | ||
429 | /* Insert logical/bitmask immediate for e.g. the last operand in | |
430 | ORR <Wd|WSP>, <Wn>, #<imm>. */ | |
431 | const char * | |
432 | aarch64_ins_limm (const aarch64_operand *self, const aarch64_opnd_info *info, | |
433 | aarch64_insn *code, const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
434 | { | |
435 | aarch64_insn value; | |
436 | uint64_t imm = info->imm.value; | |
437 | int is32 = aarch64_get_qualifier_esize (inst->operands[0].qualifier) == 4; | |
438 | ||
439 | if (inst->opcode->op == OP_BIC) | |
440 | imm = ~imm; | |
441 | if (aarch64_logical_immediate_p (imm, is32, &value) == FALSE) | |
442 | /* The constraint check should have guaranteed this wouldn't happen. */ | |
443 | assert (0); | |
444 | ||
445 | insert_fields (code, value, 0, 3, self->fields[2], self->fields[1], | |
446 | self->fields[0]); | |
447 | return NULL; | |
448 | } | |
449 | ||
450 | /* Encode Ft for e.g. STR <Qt>, [<Xn|SP>, <R><m>{, <extend> {<amount>}}] | |
451 | or LDP <Qt1>, <Qt2>, [<Xn|SP>], #<imm>. */ | |
452 | const char * | |
453 | aarch64_ins_ft (const aarch64_operand *self, const aarch64_opnd_info *info, | |
454 | aarch64_insn *code, const aarch64_inst *inst) | |
455 | { | |
456 | aarch64_insn value; | |
457 | ||
458 | assert (info->idx == 0); | |
459 | ||
460 | /* Rt */ | |
461 | aarch64_ins_regno (self, info, code, inst); | |
462 | if (inst->opcode->iclass == ldstpair_indexed | |
463 | || inst->opcode->iclass == ldstnapair_offs | |
464 | || inst->opcode->iclass == ldstpair_off | |
465 | || inst->opcode->iclass == loadlit) | |
466 | { | |
467 | /* size */ | |
468 | switch (info->qualifier) | |
469 | { | |
470 | case AARCH64_OPND_QLF_S_S: value = 0; break; | |
471 | case AARCH64_OPND_QLF_S_D: value = 1; break; | |
472 | case AARCH64_OPND_QLF_S_Q: value = 2; break; | |
473 | default: assert (0); | |
474 | } | |
475 | insert_field (FLD_ldst_size, code, value, 0); | |
476 | } | |
477 | else | |
478 | { | |
479 | /* opc[1]:size */ | |
480 | value = aarch64_get_qualifier_standard_value (info->qualifier); | |
481 | insert_fields (code, value, 0, 2, FLD_ldst_size, FLD_opc1); | |
482 | } | |
483 | ||
484 | return NULL; | |
485 | } | |
486 | ||
487 | /* Encode the address operand for e.g. STXRB <Ws>, <Wt>, [<Xn|SP>{,#0}]. */ | |
488 | const char * | |
489 | aarch64_ins_addr_simple (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
490 | const aarch64_opnd_info *info, aarch64_insn *code, | |
491 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
492 | { | |
493 | /* Rn */ | |
494 | insert_field (FLD_Rn, code, info->addr.base_regno, 0); | |
495 | return NULL; | |
496 | } | |
497 | ||
498 | /* Encode the address operand for e.g. | |
499 | STR <Qt>, [<Xn|SP>, <R><m>{, <extend> {<amount>}}]. */ | |
500 | const char * | |
501 | aarch64_ins_addr_regoff (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
502 | const aarch64_opnd_info *info, aarch64_insn *code, | |
503 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
504 | { | |
505 | aarch64_insn S; | |
506 | enum aarch64_modifier_kind kind = info->shifter.kind; | |
507 | ||
508 | /* Rn */ | |
509 | insert_field (FLD_Rn, code, info->addr.base_regno, 0); | |
510 | /* Rm */ | |
511 | insert_field (FLD_Rm, code, info->addr.offset.regno, 0); | |
512 | /* option */ | |
513 | if (kind == AARCH64_MOD_LSL) | |
514 | kind = AARCH64_MOD_UXTX; /* Trick to enable the table-driven. */ | |
515 | insert_field (FLD_option, code, aarch64_get_operand_modifier_value (kind), 0); | |
516 | /* S */ | |
517 | if (info->qualifier != AARCH64_OPND_QLF_S_B) | |
518 | S = info->shifter.amount != 0; | |
519 | else | |
520 | /* For STR <Bt>, [<Xn|SP>, <R><m>{, <extend> {<amount>}}, | |
521 | S <amount> | |
522 | 0 [absent] | |
523 | 1 #0 | |
524 | Must be #0 if <extend> is explicitly LSL. */ | |
525 | S = info->shifter.operator_present && info->shifter.amount_present; | |
526 | insert_field (FLD_S, code, S, 0); | |
527 | ||
528 | return NULL; | |
529 | } | |
530 | ||
531 | /* Encode the address operand for e.g. LDRSW <Xt>, [<Xn|SP>, #<simm>]!. */ | |
532 | const char * | |
533 | aarch64_ins_addr_simm (const aarch64_operand *self, | |
534 | const aarch64_opnd_info *info, | |
535 | aarch64_insn *code, const aarch64_inst *inst) | |
536 | { | |
537 | int imm; | |
538 | ||
539 | /* Rn */ | |
540 | insert_field (FLD_Rn, code, info->addr.base_regno, 0); | |
541 | /* simm (imm9 or imm7) */ | |
542 | imm = info->addr.offset.imm; | |
543 | if (self->fields[0] == FLD_imm7) | |
544 | /* scaled immediate in ld/st pair instructions.. */ | |
545 | imm >>= get_logsz (aarch64_get_qualifier_esize (info->qualifier)); | |
546 | insert_field (self->fields[0], code, imm, 0); | |
547 | /* pre/post- index */ | |
548 | if (info->addr.writeback) | |
549 | { | |
550 | assert (inst->opcode->iclass != ldst_unscaled | |
551 | && inst->opcode->iclass != ldstnapair_offs | |
552 | && inst->opcode->iclass != ldstpair_off | |
553 | && inst->opcode->iclass != ldst_unpriv); | |
554 | assert (info->addr.preind != info->addr.postind); | |
555 | if (info->addr.preind) | |
556 | insert_field (self->fields[1], code, 1, 0); | |
557 | } | |
558 | ||
559 | return NULL; | |
560 | } | |
561 | ||
562 | /* Encode the address operand for e.g. LDRSW <Xt>, [<Xn|SP>{, #<pimm>}]. */ | |
563 | const char * | |
564 | aarch64_ins_addr_uimm12 (const aarch64_operand *self, | |
565 | const aarch64_opnd_info *info, | |
566 | aarch64_insn *code, | |
567 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
568 | { | |
569 | int shift = get_logsz (aarch64_get_qualifier_esize (info->qualifier)); | |
570 | ||
571 | /* Rn */ | |
572 | insert_field (self->fields[0], code, info->addr.base_regno, 0); | |
573 | /* uimm12 */ | |
574 | insert_field (self->fields[1], code,info->addr.offset.imm >> shift, 0); | |
575 | return NULL; | |
576 | } | |
577 | ||
578 | /* Encode the address operand for e.g. | |
579 | LD1 {<Vt>.<T>, <Vt2>.<T>, <Vt3>.<T>}, [<Xn|SP>], <Xm|#<amount>>. */ | |
580 | const char * | |
581 | aarch64_ins_simd_addr_post (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
582 | const aarch64_opnd_info *info, aarch64_insn *code, | |
583 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
584 | { | |
585 | /* Rn */ | |
586 | insert_field (FLD_Rn, code, info->addr.base_regno, 0); | |
587 | /* Rm | #<amount> */ | |
588 | if (info->addr.offset.is_reg) | |
589 | insert_field (FLD_Rm, code, info->addr.offset.regno, 0); | |
590 | else | |
591 | insert_field (FLD_Rm, code, 0x1f, 0); | |
592 | return NULL; | |
593 | } | |
594 | ||
595 | /* Encode the condition operand for e.g. CSEL <Xd>, <Xn>, <Xm>, <cond>. */ | |
596 | const char * | |
597 | aarch64_ins_cond (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
598 | const aarch64_opnd_info *info, aarch64_insn *code, | |
599 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
600 | { | |
601 | /* cond */ | |
602 | insert_field (FLD_cond, code, info->cond->value, 0); | |
603 | return NULL; | |
604 | } | |
605 | ||
606 | /* Encode the system register operand for e.g. MRS <Xt>, <systemreg>. */ | |
607 | const char * | |
608 | aarch64_ins_sysreg (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
609 | const aarch64_opnd_info *info, aarch64_insn *code, | |
610 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
611 | { | |
612 | /* op0:op1:CRn:CRm:op2 */ | |
613 | insert_fields (code, info->sysreg, inst->opcode->mask, 5, | |
614 | FLD_op2, FLD_CRm, FLD_CRn, FLD_op1, FLD_op0); | |
615 | return NULL; | |
616 | } | |
617 | ||
618 | /* Encode the PSTATE field operand for e.g. MSR <pstatefield>, #<imm>. */ | |
619 | const char * | |
620 | aarch64_ins_pstatefield (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
621 | const aarch64_opnd_info *info, aarch64_insn *code, | |
622 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
623 | { | |
624 | /* op1:op2 */ | |
625 | insert_fields (code, info->pstatefield, inst->opcode->mask, 2, | |
626 | FLD_op2, FLD_op1); | |
627 | return NULL; | |
628 | } | |
629 | ||
630 | /* Encode the system instruction op operand for e.g. AT <at_op>, <Xt>. */ | |
631 | const char * | |
632 | aarch64_ins_sysins_op (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
633 | const aarch64_opnd_info *info, aarch64_insn *code, | |
634 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
635 | { | |
636 | /* op1:CRn:CRm:op2 */ | |
637 | insert_fields (code, info->sysins_op->value, inst->opcode->mask, 4, | |
638 | FLD_op2, FLD_CRm, FLD_CRn, FLD_op1); | |
639 | return NULL; | |
640 | } | |
641 | ||
642 | /* Encode the memory barrier option operand for e.g. DMB <option>|#<imm>. */ | |
643 | ||
644 | const char * | |
645 | aarch64_ins_barrier (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
646 | const aarch64_opnd_info *info, aarch64_insn *code, | |
647 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
648 | { | |
649 | /* CRm */ | |
650 | insert_field (FLD_CRm, code, info->barrier->value, 0); | |
651 | return NULL; | |
652 | } | |
653 | ||
654 | /* Encode the prefetch operation option operand for e.g. | |
655 | PRFM <prfop>, [<Xn|SP>{, #<pimm>}]. */ | |
656 | ||
657 | const char * | |
658 | aarch64_ins_prfop (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
659 | const aarch64_opnd_info *info, aarch64_insn *code, | |
660 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
661 | { | |
662 | /* prfop in Rt */ | |
663 | insert_field (FLD_Rt, code, info->prfop->value, 0); | |
664 | return NULL; | |
665 | } | |
666 | ||
667 | /* Encode the extended register operand for e.g. | |
668 | STR <Qt>, [<Xn|SP>, <R><m>{, <extend> {<amount>}}]. */ | |
669 | const char * | |
670 | aarch64_ins_reg_extended (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
671 | const aarch64_opnd_info *info, aarch64_insn *code, | |
672 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
673 | { | |
674 | enum aarch64_modifier_kind kind; | |
675 | ||
676 | /* Rm */ | |
677 | insert_field (FLD_Rm, code, info->reg.regno, 0); | |
678 | /* option */ | |
679 | kind = info->shifter.kind; | |
680 | if (kind == AARCH64_MOD_LSL) | |
681 | kind = info->qualifier == AARCH64_OPND_QLF_W | |
682 | ? AARCH64_MOD_UXTW : AARCH64_MOD_UXTX; | |
683 | insert_field (FLD_option, code, aarch64_get_operand_modifier_value (kind), 0); | |
684 | /* imm3 */ | |
685 | insert_field (FLD_imm3, code, info->shifter.amount, 0); | |
686 | ||
687 | return NULL; | |
688 | } | |
689 | ||
690 | /* Encode the shifted register operand for e.g. | |
691 | SUBS <Xd>, <Xn>, <Xm> {, <shift> #<amount>}. */ | |
692 | const char * | |
693 | aarch64_ins_reg_shifted (const aarch64_operand *self ATTRIBUTE_UNUSED, | |
694 | const aarch64_opnd_info *info, aarch64_insn *code, | |
695 | const aarch64_inst *inst ATTRIBUTE_UNUSED) | |
696 | { | |
697 | /* Rm */ | |
698 | insert_field (FLD_Rm, code, info->reg.regno, 0); | |
699 | /* shift */ | |
700 | insert_field (FLD_shift, code, | |
701 | aarch64_get_operand_modifier_value (info->shifter.kind), 0); | |
702 | /* imm6 */ | |
703 | insert_field (FLD_imm6, code, info->shifter.amount, 0); | |
704 | ||
705 | return NULL; | |
706 | } | |
707 | ||
708 | /* Miscellaneous encoding functions. */ | |
709 | ||
710 | /* Encode size[0], i.e. bit 22, for | |
711 | e.g. FCVTN<Q> <Vd>.<Tb>, <Vn>.<Ta>. */ | |
712 | ||
713 | static void | |
714 | encode_asimd_fcvt (aarch64_inst *inst) | |
715 | { | |
716 | aarch64_insn value; | |
717 | aarch64_field field = {0, 0}; | |
718 | enum aarch64_opnd_qualifier qualifier; | |
719 | ||
720 | switch (inst->opcode->op) | |
721 | { | |
722 | case OP_FCVTN: | |
723 | case OP_FCVTN2: | |
724 | /* FCVTN<Q> <Vd>.<Tb>, <Vn>.<Ta>. */ | |
725 | qualifier = inst->operands[1].qualifier; | |
726 | break; | |
727 | case OP_FCVTL: | |
728 | case OP_FCVTL2: | |
729 | /* FCVTL<Q> <Vd>.<Ta>, <Vn>.<Tb>. */ | |
730 | qualifier = inst->operands[0].qualifier; | |
731 | break; | |
732 | default: | |
733 | assert (0); | |
734 | } | |
735 | assert (qualifier == AARCH64_OPND_QLF_V_4S | |
736 | || qualifier == AARCH64_OPND_QLF_V_2D); | |
737 | value = (qualifier == AARCH64_OPND_QLF_V_4S) ? 0 : 1; | |
738 | gen_sub_field (FLD_size, 0, 1, &field); | |
739 | insert_field_2 (&field, &inst->value, value, 0); | |
740 | } | |
741 | ||
742 | /* Encode size[0], i.e. bit 22, for | |
743 | e.g. FCVTXN <Vb><d>, <Va><n>. */ | |
744 | ||
745 | static void | |
746 | encode_asisd_fcvtxn (aarch64_inst *inst) | |
747 | { | |
748 | aarch64_insn val = 1; | |
749 | aarch64_field field = {0, 0}; | |
750 | assert (inst->operands[0].qualifier == AARCH64_OPND_QLF_S_S); | |
751 | gen_sub_field (FLD_size, 0, 1, &field); | |
752 | insert_field_2 (&field, &inst->value, val, 0); | |
753 | } | |
754 | ||
755 | /* Encode the 'opc' field for e.g. FCVT <Dd>, <Sn>. */ | |
756 | static void | |
757 | encode_fcvt (aarch64_inst *inst) | |
758 | { | |
759 | aarch64_insn val; | |
760 | const aarch64_field field = {15, 2}; | |
761 | ||
762 | /* opc dstsize */ | |
763 | switch (inst->operands[0].qualifier) | |
764 | { | |
765 | case AARCH64_OPND_QLF_S_S: val = 0; break; | |
766 | case AARCH64_OPND_QLF_S_D: val = 1; break; | |
767 | case AARCH64_OPND_QLF_S_H: val = 3; break; | |
768 | default: abort (); | |
769 | } | |
770 | insert_field_2 (&field, &inst->value, val, 0); | |
771 | ||
772 | return; | |
773 | } | |
774 | ||
775 | /* Do miscellaneous encodings that are not common enough to be driven by | |
776 | flags. */ | |
777 | ||
778 | static void | |
779 | do_misc_encoding (aarch64_inst *inst) | |
780 | { | |
781 | switch (inst->opcode->op) | |
782 | { | |
783 | case OP_FCVT: | |
784 | encode_fcvt (inst); | |
785 | break; | |
786 | case OP_FCVTN: | |
787 | case OP_FCVTN2: | |
788 | case OP_FCVTL: | |
789 | case OP_FCVTL2: | |
790 | encode_asimd_fcvt (inst); | |
791 | break; | |
792 | case OP_FCVTXN_S: | |
793 | encode_asisd_fcvtxn (inst); | |
794 | break; | |
795 | default: break; | |
796 | } | |
797 | } | |
798 | ||
799 | /* Encode the 'size' and 'Q' field for e.g. SHADD. */ | |
800 | static void | |
801 | encode_sizeq (aarch64_inst *inst) | |
802 | { | |
803 | aarch64_insn sizeq; | |
804 | enum aarch64_field_kind kind; | |
805 | int idx; | |
806 | ||
807 | /* Get the index of the operand whose information we are going to use | |
808 | to encode the size and Q fields. | |
809 | This is deduced from the possible valid qualifier lists. */ | |
810 | idx = aarch64_select_operand_for_sizeq_field_coding (inst->opcode); | |
811 | DEBUG_TRACE ("idx: %d; qualifier: %s", idx, | |
812 | aarch64_get_qualifier_name (inst->operands[idx].qualifier)); | |
813 | sizeq = aarch64_get_qualifier_standard_value (inst->operands[idx].qualifier); | |
814 | /* Q */ | |
815 | insert_field (FLD_Q, &inst->value, sizeq & 0x1, inst->opcode->mask); | |
816 | /* size */ | |
817 | if (inst->opcode->iclass == asisdlse | |
818 | || inst->opcode->iclass == asisdlsep | |
819 | || inst->opcode->iclass == asisdlso | |
820 | || inst->opcode->iclass == asisdlsop) | |
821 | kind = FLD_vldst_size; | |
822 | else | |
823 | kind = FLD_size; | |
824 | insert_field (kind, &inst->value, (sizeq >> 1) & 0x3, inst->opcode->mask); | |
825 | } | |
826 | ||
827 | /* Opcodes that have fields shared by multiple operands are usually flagged | |
828 | with flags. In this function, we detect such flags and use the | |
829 | information in one of the related operands to do the encoding. The 'one' | |
830 | operand is not any operand but one of the operands that has the enough | |
831 | information for such an encoding. */ | |
832 | ||
833 | static void | |
834 | do_special_encoding (struct aarch64_inst *inst) | |
835 | { | |
836 | int idx; | |
837 | aarch64_insn value; | |
838 | ||
839 | DEBUG_TRACE ("enter with coding 0x%x", (uint32_t) inst->value); | |
840 | ||
841 | /* Condition for truly conditional executed instructions, e.g. b.cond. */ | |
842 | if (inst->opcode->flags & F_COND) | |
843 | { | |
844 | insert_field (FLD_cond2, &inst->value, inst->cond->value, 0); | |
845 | } | |
846 | if (inst->opcode->flags & F_SF) | |
847 | { | |
848 | idx = select_operand_for_sf_field_coding (inst->opcode); | |
849 | value = (inst->operands[idx].qualifier == AARCH64_OPND_QLF_X | |
850 | || inst->operands[idx].qualifier == AARCH64_OPND_QLF_SP) | |
851 | ? 1 : 0; | |
852 | insert_field (FLD_sf, &inst->value, value, 0); | |
853 | if (inst->opcode->flags & F_N) | |
854 | insert_field (FLD_N, &inst->value, value, inst->opcode->mask); | |
855 | } | |
856 | if (inst->opcode->flags & F_SIZEQ) | |
857 | encode_sizeq (inst); | |
858 | if (inst->opcode->flags & F_FPTYPE) | |
859 | { | |
860 | idx = select_operand_for_fptype_field_coding (inst->opcode); | |
861 | switch (inst->operands[idx].qualifier) | |
862 | { | |
863 | case AARCH64_OPND_QLF_S_S: value = 0; break; | |
864 | case AARCH64_OPND_QLF_S_D: value = 1; break; | |
865 | case AARCH64_OPND_QLF_S_H: value = 3; break; | |
866 | default: assert (0); | |
867 | } | |
868 | insert_field (FLD_type, &inst->value, value, 0); | |
869 | } | |
870 | if (inst->opcode->flags & F_SSIZE) | |
871 | { | |
872 | enum aarch64_opnd_qualifier qualifier; | |
873 | idx = select_operand_for_scalar_size_field_coding (inst->opcode); | |
874 | qualifier = inst->operands[idx].qualifier; | |
875 | assert (qualifier >= AARCH64_OPND_QLF_S_B | |
876 | && qualifier <= AARCH64_OPND_QLF_S_Q); | |
877 | value = aarch64_get_qualifier_standard_value (qualifier); | |
878 | insert_field (FLD_size, &inst->value, value, inst->opcode->mask); | |
879 | } | |
880 | if (inst->opcode->flags & F_T) | |
881 | { | |
882 | int num; /* num of consecutive '0's on the right side of imm5<3:0>. */ | |
883 | aarch64_field field = {0, 0}; | |
884 | enum aarch64_opnd_qualifier qualifier; | |
885 | ||
886 | idx = 0; | |
887 | qualifier = inst->operands[idx].qualifier; | |
888 | assert (aarch64_get_operand_class (inst->opcode->operands[0]) | |
889 | == AARCH64_OPND_CLASS_SIMD_REG | |
890 | && qualifier >= AARCH64_OPND_QLF_V_8B | |
891 | && qualifier <= AARCH64_OPND_QLF_V_2D); | |
892 | /* imm5<3:0> q <t> | |
893 | 0000 x reserved | |
894 | xxx1 0 8b | |
895 | xxx1 1 16b | |
896 | xx10 0 4h | |
897 | xx10 1 8h | |
898 | x100 0 2s | |
899 | x100 1 4s | |
900 | 1000 0 reserved | |
901 | 1000 1 2d */ | |
902 | value = aarch64_get_qualifier_standard_value (qualifier); | |
903 | insert_field (FLD_Q, &inst->value, value & 0x1, inst->opcode->mask); | |
904 | num = (int) value >> 1; | |
905 | assert (num >= 0 && num <= 3); | |
906 | gen_sub_field (FLD_imm5, 0, num + 1, &field); | |
907 | insert_field_2 (&field, &inst->value, 1 << num, inst->opcode->mask); | |
908 | } | |
909 | if (inst->opcode->flags & F_GPRSIZE_IN_Q) | |
910 | { | |
911 | /* Use Rt to encode in the case of e.g. | |
912 | STXP <Ws>, <Xt1>, <Xt2>, [<Xn|SP>{,#0}]. */ | |
913 | enum aarch64_opnd_qualifier qualifier; | |
914 | idx = aarch64_operand_index (inst->opcode->operands, AARCH64_OPND_Rt); | |
915 | if (idx == -1) | |
916 | /* Otherwise use the result operand, which has to be a integer | |
917 | register. */ | |
918 | idx = 0; | |
919 | assert (idx == 0 || idx == 1); | |
920 | assert (aarch64_get_operand_class (inst->opcode->operands[idx]) | |
921 | == AARCH64_OPND_CLASS_INT_REG); | |
922 | qualifier = inst->operands[idx].qualifier; | |
923 | insert_field (FLD_Q, &inst->value, | |
924 | aarch64_get_qualifier_standard_value (qualifier), 0); | |
925 | } | |
926 | if (inst->opcode->flags & F_LDS_SIZE) | |
927 | { | |
928 | /* e.g. LDRSB <Wt>, [<Xn|SP>, <R><m>{, <extend> {<amount>}}]. */ | |
929 | enum aarch64_opnd_qualifier qualifier; | |
930 | aarch64_field field = {0, 0}; | |
931 | assert (aarch64_get_operand_class (inst->opcode->operands[0]) | |
932 | == AARCH64_OPND_CLASS_INT_REG); | |
933 | gen_sub_field (FLD_opc, 0, 1, &field); | |
934 | qualifier = inst->operands[0].qualifier; | |
935 | insert_field_2 (&field, &inst->value, | |
936 | 1 - aarch64_get_qualifier_standard_value (qualifier), 0); | |
937 | } | |
938 | /* Miscellaneous encoding as the last step. */ | |
939 | if (inst->opcode->flags & F_MISC) | |
940 | do_misc_encoding (inst); | |
941 | ||
942 | DEBUG_TRACE ("exit with coding 0x%x", (uint32_t) inst->value); | |
943 | } | |
944 | ||
945 | /* Converters converting an alias opcode instruction to its real form. */ | |
946 | ||
947 | /* ROR <Wd>, <Ws>, #<shift> | |
948 | is equivalent to: | |
949 | EXTR <Wd>, <Ws>, <Ws>, #<shift>. */ | |
950 | static void | |
951 | convert_ror_to_extr (aarch64_inst *inst) | |
952 | { | |
953 | copy_operand_info (inst, 3, 2); | |
954 | copy_operand_info (inst, 2, 1); | |
955 | } | |
956 | ||
957 | /* Convert | |
958 | LSR <Xd>, <Xn>, #<shift> | |
959 | to | |
960 | UBFM <Xd>, <Xn>, #<shift>, #63. */ | |
961 | static void | |
962 | convert_sr_to_bfm (aarch64_inst *inst) | |
963 | { | |
964 | inst->operands[3].imm.value = | |
965 | inst->operands[2].qualifier == AARCH64_OPND_QLF_imm_0_31 ? 31 : 63; | |
966 | } | |
967 | ||
968 | /* Convert MOV to ORR. */ | |
969 | static void | |
970 | convert_mov_to_orr (aarch64_inst *inst) | |
971 | { | |
972 | /* MOV <Vd>.<T>, <Vn>.<T> | |
973 | is equivalent to: | |
974 | ORR <Vd>.<T>, <Vn>.<T>, <Vn>.<T>. */ | |
975 | copy_operand_info (inst, 2, 1); | |
976 | } | |
977 | ||
978 | /* When <imms> >= <immr>, the instruction written: | |
979 | SBFX <Xd>, <Xn>, #<lsb>, #<width> | |
980 | is equivalent to: | |
981 | SBFM <Xd>, <Xn>, #<lsb>, #(<lsb>+<width>-1). */ | |
982 | ||
983 | static void | |
984 | convert_bfx_to_bfm (aarch64_inst *inst) | |
985 | { | |
986 | int64_t lsb, width; | |
987 | ||
988 | /* Convert the operand. */ | |
989 | lsb = inst->operands[2].imm.value; | |
990 | width = inst->operands[3].imm.value; | |
991 | inst->operands[2].imm.value = lsb; | |
992 | inst->operands[3].imm.value = lsb + width - 1; | |
993 | } | |
994 | ||
995 | /* When <imms> < <immr>, the instruction written: | |
996 | SBFIZ <Xd>, <Xn>, #<lsb>, #<width> | |
997 | is equivalent to: | |
998 | SBFM <Xd>, <Xn>, #((64-<lsb>)&0x3f), #(<width>-1). */ | |
999 | ||
1000 | static void | |
1001 | convert_bfi_to_bfm (aarch64_inst *inst) | |
1002 | { | |
1003 | int64_t lsb, width; | |
1004 | ||
1005 | /* Convert the operand. */ | |
1006 | lsb = inst->operands[2].imm.value; | |
1007 | width = inst->operands[3].imm.value; | |
1008 | if (inst->operands[2].qualifier == AARCH64_OPND_QLF_imm_0_31) | |
1009 | { | |
1010 | inst->operands[2].imm.value = (32 - lsb) & 0x1f; | |
1011 | inst->operands[3].imm.value = width - 1; | |
1012 | } | |
1013 | else | |
1014 | { | |
1015 | inst->operands[2].imm.value = (64 - lsb) & 0x3f; | |
1016 | inst->operands[3].imm.value = width - 1; | |
1017 | } | |
1018 | } | |
1019 | ||
1020 | /* The instruction written: | |
1021 | LSL <Xd>, <Xn>, #<shift> | |
1022 | is equivalent to: | |
1023 | UBFM <Xd>, <Xn>, #((64-<shift>)&0x3f), #(63-<shift>). */ | |
1024 | ||
1025 | static void | |
1026 | convert_lsl_to_ubfm (aarch64_inst *inst) | |
1027 | { | |
1028 | int64_t shift = inst->operands[2].imm.value; | |
1029 | ||
1030 | if (inst->operands[2].qualifier == AARCH64_OPND_QLF_imm_0_31) | |
1031 | { | |
1032 | inst->operands[2].imm.value = (32 - shift) & 0x1f; | |
1033 | inst->operands[3].imm.value = 31 - shift; | |
1034 | } | |
1035 | else | |
1036 | { | |
1037 | inst->operands[2].imm.value = (64 - shift) & 0x3f; | |
1038 | inst->operands[3].imm.value = 63 - shift; | |
1039 | } | |
1040 | } | |
1041 | ||
1042 | /* CINC <Wd>, <Wn>, <cond> | |
1043 | is equivalent to: | |
1044 | CSINC <Wd>, <Wn>, <Wn>, invert(<cond>). */ | |
1045 | ||
1046 | static void | |
1047 | convert_to_csel (aarch64_inst *inst) | |
1048 | { | |
1049 | copy_operand_info (inst, 3, 2); | |
1050 | copy_operand_info (inst, 2, 1); | |
1051 | inst->operands[3].cond = get_inverted_cond (inst->operands[3].cond); | |
1052 | } | |
1053 | ||
1054 | /* CSET <Wd>, <cond> | |
1055 | is equivalent to: | |
1056 | CSINC <Wd>, WZR, WZR, invert(<cond>). */ | |
1057 | ||
1058 | static void | |
1059 | convert_cset_to_csinc (aarch64_inst *inst) | |
1060 | { | |
1061 | copy_operand_info (inst, 3, 1); | |
1062 | copy_operand_info (inst, 2, 0); | |
1063 | copy_operand_info (inst, 1, 0); | |
1064 | inst->operands[1].reg.regno = 0x1f; | |
1065 | inst->operands[2].reg.regno = 0x1f; | |
1066 | inst->operands[3].cond = get_inverted_cond (inst->operands[3].cond); | |
1067 | } | |
1068 | ||
1069 | /* MOV <Wd>, #<imm> | |
1070 | is equivalent to: | |
1071 | MOVZ <Wd>, #<imm16>, LSL #<shift>. */ | |
1072 | ||
1073 | static void | |
1074 | convert_mov_to_movewide (aarch64_inst *inst) | |
1075 | { | |
1076 | int is32; | |
1077 | uint32_t shift_amount; | |
1078 | uint64_t value; | |
1079 | ||
1080 | switch (inst->opcode->op) | |
1081 | { | |
1082 | case OP_MOV_IMM_WIDE: | |
1083 | value = inst->operands[1].imm.value; | |
1084 | break; | |
1085 | case OP_MOV_IMM_WIDEN: | |
1086 | value = ~inst->operands[1].imm.value; | |
1087 | break; | |
1088 | default: | |
1089 | assert (0); | |
1090 | } | |
1091 | inst->operands[1].type = AARCH64_OPND_HALF; | |
1092 | is32 = inst->operands[0].qualifier == AARCH64_OPND_QLF_W; | |
1093 | /* This should have been guaranteed by the constraint check. */ | |
1094 | assert (aarch64_wide_constant_p (value, is32, &shift_amount) == TRUE); | |
1095 | value >>= shift_amount; | |
1096 | value &= 0xffff; | |
1097 | inst->operands[1].imm.value = value; | |
1098 | inst->operands[1].shifter.kind = AARCH64_MOD_LSL; | |
1099 | inst->operands[1].shifter.amount = shift_amount; | |
1100 | } | |
1101 | ||
1102 | /* MOV <Wd>, #<imm> | |
1103 | is equivalent to: | |
1104 | ORR <Wd>, WZR, #<imm>. */ | |
1105 | ||
1106 | static void | |
1107 | convert_mov_to_movebitmask (aarch64_inst *inst) | |
1108 | { | |
1109 | copy_operand_info (inst, 2, 1); | |
1110 | inst->operands[1].reg.regno = 0x1f; | |
1111 | inst->operands[1].skip = 0; | |
1112 | } | |
1113 | ||
1114 | /* Some alias opcodes are assembled by being converted to their real-form. */ | |
1115 | ||
1116 | static void | |
1117 | convert_to_real (aarch64_inst *inst, const aarch64_opcode *real) | |
1118 | { | |
1119 | const aarch64_opcode *alias = inst->opcode; | |
1120 | ||
1121 | if ((alias->flags & F_CONV) == 0) | |
1122 | goto convert_to_real_return; | |
1123 | ||
1124 | switch (alias->op) | |
1125 | { | |
1126 | case OP_ASR_IMM: | |
1127 | case OP_LSR_IMM: | |
1128 | convert_sr_to_bfm (inst); | |
1129 | break; | |
1130 | case OP_LSL_IMM: | |
1131 | convert_lsl_to_ubfm (inst); | |
1132 | break; | |
1133 | case OP_CINC: | |
1134 | case OP_CINV: | |
1135 | case OP_CNEG: | |
1136 | convert_to_csel (inst); | |
1137 | break; | |
1138 | case OP_CSET: | |
1139 | case OP_CSETM: | |
1140 | convert_cset_to_csinc (inst); | |
1141 | break; | |
1142 | case OP_UBFX: | |
1143 | case OP_BFXIL: | |
1144 | case OP_SBFX: | |
1145 | convert_bfx_to_bfm (inst); | |
1146 | break; | |
1147 | case OP_SBFIZ: | |
1148 | case OP_BFI: | |
1149 | case OP_UBFIZ: | |
1150 | convert_bfi_to_bfm (inst); | |
1151 | break; | |
1152 | case OP_MOV_V: | |
1153 | convert_mov_to_orr (inst); | |
1154 | break; | |
1155 | case OP_MOV_IMM_WIDE: | |
1156 | case OP_MOV_IMM_WIDEN: | |
1157 | convert_mov_to_movewide (inst); | |
1158 | break; | |
1159 | case OP_MOV_IMM_LOG: | |
1160 | convert_mov_to_movebitmask (inst); | |
1161 | break; | |
1162 | case OP_ROR_IMM: | |
1163 | convert_ror_to_extr (inst); | |
1164 | break; | |
1165 | default: | |
1166 | break; | |
1167 | } | |
1168 | ||
1169 | convert_to_real_return: | |
1170 | aarch64_replace_opcode (inst, real); | |
1171 | } | |
1172 | ||
1173 | /* Encode *INST_ORI of the opcode code OPCODE. | |
1174 | Return the encoded result in *CODE and if QLF_SEQ is not NULL, return the | |
1175 | matched operand qualifier sequence in *QLF_SEQ. */ | |
1176 | ||
1177 | int | |
1178 | aarch64_opcode_encode (const aarch64_opcode *opcode, | |
1179 | const aarch64_inst *inst_ori, aarch64_insn *code, | |
1180 | aarch64_opnd_qualifier_t *qlf_seq, | |
1181 | aarch64_operand_error *mismatch_detail) | |
1182 | { | |
1183 | int i; | |
1184 | const aarch64_opcode *aliased; | |
1185 | aarch64_inst copy, *inst; | |
1186 | ||
1187 | DEBUG_TRACE ("enter with %s", opcode->name); | |
1188 | ||
1189 | /* Create a copy of *INST_ORI, so that we can do any change we want. */ | |
1190 | copy = *inst_ori; | |
1191 | inst = © | |
1192 | ||
1193 | assert (inst->opcode == NULL || inst->opcode == opcode); | |
1194 | if (inst->opcode == NULL) | |
1195 | inst->opcode = opcode; | |
1196 | ||
1197 | /* Constrain the operands. | |
1198 | After passing this, the encoding is guaranteed to succeed. */ | |
1199 | if (aarch64_match_operands_constraint (inst, mismatch_detail) == 0) | |
1200 | { | |
1201 | DEBUG_TRACE ("FAIL since operand constraint not met"); | |
1202 | return 0; | |
1203 | } | |
1204 | ||
1205 | /* Get the base value. | |
1206 | Note: this has to be before the aliasing handling below in order to | |
1207 | get the base value from the alias opcode before we move on to the | |
1208 | aliased opcode for encoding. */ | |
1209 | inst->value = opcode->opcode; | |
1210 | ||
1211 | /* No need to do anything else if the opcode does not have any operand. */ | |
1212 | if (aarch64_num_of_operands (opcode) == 0) | |
1213 | goto encoding_exit; | |
1214 | ||
1215 | /* Assign operand indexes and check types. Also put the matched | |
1216 | operand qualifiers in *QLF_SEQ to return. */ | |
1217 | for (i = 0; i < AARCH64_MAX_OPND_NUM; ++i) | |
1218 | { | |
1219 | assert (opcode->operands[i] == inst->operands[i].type); | |
1220 | inst->operands[i].idx = i; | |
1221 | if (qlf_seq != NULL) | |
1222 | *qlf_seq = inst->operands[i].qualifier; | |
1223 | } | |
1224 | ||
1225 | aliased = aarch64_find_real_opcode (opcode); | |
1226 | /* If the opcode is an alias and it does not ask for direct encoding by | |
1227 | itself, the instruction will be transformed to the form of real opcode | |
1228 | and the encoding will be carried out using the rules for the aliased | |
1229 | opcode. */ | |
1230 | if (aliased != NULL && (opcode->flags & F_CONV)) | |
1231 | { | |
1232 | DEBUG_TRACE ("real opcode '%s' has been found for the alias %s", | |
1233 | aliased->name, opcode->name); | |
1234 | /* Convert the operands to the form of the real opcode. */ | |
1235 | convert_to_real (inst, aliased); | |
1236 | opcode = aliased; | |
1237 | } | |
1238 | ||
1239 | aarch64_opnd_info *info = inst->operands; | |
1240 | ||
1241 | /* Call the inserter of each operand. */ | |
1242 | for (i = 0; i < AARCH64_MAX_OPND_NUM; ++i, ++info) | |
1243 | { | |
1244 | const aarch64_operand *opnd; | |
1245 | enum aarch64_opnd type = opcode->operands[i]; | |
1246 | if (type == AARCH64_OPND_NIL) | |
1247 | break; | |
1248 | if (info->skip) | |
1249 | { | |
1250 | DEBUG_TRACE ("skip the incomplete operand %d", i); | |
1251 | continue; | |
1252 | } | |
1253 | opnd = &aarch64_operands[type]; | |
1254 | if (operand_has_inserter (opnd)) | |
1255 | aarch64_insert_operand (opnd, info, &inst->value, inst); | |
1256 | } | |
1257 | ||
1258 | /* Call opcode encoders indicated by flags. */ | |
1259 | if (opcode_has_special_coder (opcode)) | |
1260 | do_special_encoding (inst); | |
1261 | ||
1262 | encoding_exit: | |
1263 | DEBUG_TRACE ("exit with %s", opcode->name); | |
1264 | ||
1265 | *code = inst->value; | |
1266 | ||
1267 | return 1; | |
1268 | } |