1 /* aarch64-asm.c -- AArch64 assembler support.
2 Copyright (C) 2012-2016 Free Software Foundation, Inc.
3 Contributed by ARM Ltd.
5 This file is part of the GNU opcodes library.
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)
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.
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/>. */
23 #include "libiberty.h"
24 #include "aarch64-asm.h"
28 /* The unnamed arguments consist of the number of fields and information about
29 these fields where the VALUE will be inserted into CODE. MASK can be zero or
30 the base mask of the opcode.
32 N.B. the fields are required to be in such an order than the least signficant
33 field for VALUE comes the first, e.g. the <index> in
34 SQDMLAL <Va><d>, <Vb><n>, <Vm>.<Ts>[<index>]
35 is encoded in H:L:M in some cases, the fields H:L:M should be passed in
36 the order of M, L, H. */
39 insert_fields (aarch64_insn *code, aarch64_insn value, aarch64_insn mask, ...)
42 const aarch64_field *field;
43 enum aarch64_field_kind kind;
47 num = va_arg (va, uint32_t);
51 kind = va_arg (va, enum aarch64_field_kind);
52 field = &fields[kind];
53 insert_field (kind, code, value, mask);
54 value >>= field->width;
59 /* Insert a raw field value VALUE into all fields in SELF->fields.
60 The least significant bit goes in the final field. */
63 insert_all_fields (const aarch64_operand *self, aarch64_insn *code,
67 enum aarch64_field_kind kind;
69 for (i = ARRAY_SIZE (self->fields); i-- > 0; )
70 if (self->fields[i] != FLD_NIL)
72 kind = self->fields[i];
73 insert_field (kind, code, value, 0);
74 value >>= fields[kind].width;
78 /* Operand inserters. */
80 /* Insert register number. */
82 aarch64_ins_regno (const aarch64_operand *self, const aarch64_opnd_info *info,
84 const aarch64_inst *inst ATTRIBUTE_UNUSED)
86 insert_field (self->fields[0], code, info->reg.regno, 0);
90 /* Insert register number, index and/or other data for SIMD register element
91 operand, e.g. the last source operand in
92 SQDMLAL <Va><d>, <Vb><n>, <Vm>.<Ts>[<index>]. */
94 aarch64_ins_reglane (const aarch64_operand *self, const aarch64_opnd_info *info,
95 aarch64_insn *code, const aarch64_inst *inst)
98 insert_field (self->fields[0], code, info->reglane.regno, inst->opcode->mask);
99 /* index and/or type */
100 if (inst->opcode->iclass == asisdone || inst->opcode->iclass == asimdins)
102 int pos = info->qualifier - AARCH64_OPND_QLF_S_B;
103 if (info->type == AARCH64_OPND_En
104 && inst->opcode->operands[0] == AARCH64_OPND_Ed)
106 /* index2 for e.g. INS <Vd>.<Ts>[<index1>], <Vn>.<Ts>[<index2>]. */
107 assert (info->idx == 1); /* Vn */
108 aarch64_insn value = info->reglane.index << pos;
109 insert_field (FLD_imm4, code, value, 0);
113 /* index and type for e.g. DUP <V><d>, <Vn>.<T>[<index>].
120 aarch64_insn value = ((info->reglane.index << 1) | 1) << pos;
121 insert_field (FLD_imm5, code, value, 0);
126 /* index for e.g. SQDMLAL <Va><d>, <Vb><n>, <Vm>.<Ts>[<index>]
127 or SQDMLAL <Va><d>, <Vb><n>, <Vm>.<Ts>[<index>]. */
128 switch (info->qualifier)
130 case AARCH64_OPND_QLF_S_H:
132 insert_fields (code, info->reglane.index, 0, 3, FLD_M, FLD_L, FLD_H);
134 case AARCH64_OPND_QLF_S_S:
136 insert_fields (code, info->reglane.index, 0, 2, FLD_L, FLD_H);
138 case AARCH64_OPND_QLF_S_D:
140 insert_field (FLD_H, code, info->reglane.index, 0);
149 /* Insert regno and len field of a register list operand, e.g. Vn in TBL. */
151 aarch64_ins_reglist (const aarch64_operand *self, const aarch64_opnd_info *info,
153 const aarch64_inst *inst ATTRIBUTE_UNUSED)
156 insert_field (self->fields[0], code, info->reglist.first_regno, 0);
158 insert_field (FLD_len, code, info->reglist.num_regs - 1, 0);
162 /* Insert Rt and opcode fields for a register list operand, e.g. Vt
163 in AdvSIMD load/store instructions. */
165 aarch64_ins_ldst_reglist (const aarch64_operand *self ATTRIBUTE_UNUSED,
166 const aarch64_opnd_info *info, aarch64_insn *code,
167 const aarch64_inst *inst)
169 aarch64_insn value = 0;
170 /* Number of elements in each structure to be loaded/stored. */
171 unsigned num = get_opcode_dependent_value (inst->opcode);
174 insert_field (FLD_Rt, code, info->reglist.first_regno, 0);
179 switch (info->reglist.num_regs)
181 case 1: value = 0x7; break;
182 case 2: value = 0xa; break;
183 case 3: value = 0x6; break;
184 case 4: value = 0x2; break;
189 value = info->reglist.num_regs == 4 ? 0x3 : 0x8;
200 insert_field (FLD_opcode, code, value, 0);
205 /* Insert Rt and S fields for a register list operand, e.g. Vt in AdvSIMD load
206 single structure to all lanes instructions. */
208 aarch64_ins_ldst_reglist_r (const aarch64_operand *self ATTRIBUTE_UNUSED,
209 const aarch64_opnd_info *info, aarch64_insn *code,
210 const aarch64_inst *inst)
213 /* The opcode dependent area stores the number of elements in
214 each structure to be loaded/stored. */
215 int is_ld1r = get_opcode_dependent_value (inst->opcode) == 1;
218 insert_field (FLD_Rt, code, info->reglist.first_regno, 0);
220 value = (aarch64_insn) 0;
221 if (is_ld1r && info->reglist.num_regs == 2)
222 /* OP_LD1R does not have alternating variant, but have "two consecutive"
224 value = (aarch64_insn) 1;
225 insert_field (FLD_S, code, value, 0);
230 /* Insert Q, opcode<2:1>, S, size and Rt fields for a register element list
231 operand e.g. Vt in AdvSIMD load/store single element instructions. */
233 aarch64_ins_ldst_elemlist (const aarch64_operand *self ATTRIBUTE_UNUSED,
234 const aarch64_opnd_info *info, aarch64_insn *code,
235 const aarch64_inst *inst ATTRIBUTE_UNUSED)
237 aarch64_field field = {0, 0};
238 aarch64_insn QSsize = 0; /* fields Q:S:size. */
239 aarch64_insn opcodeh2 = 0; /* opcode<2:1> */
241 assert (info->reglist.has_index);
244 insert_field (FLD_Rt, code, info->reglist.first_regno, 0);
245 /* Encode the index, opcode<2:1> and size. */
246 switch (info->qualifier)
248 case AARCH64_OPND_QLF_S_B:
249 /* Index encoded in "Q:S:size". */
250 QSsize = info->reglist.index;
253 case AARCH64_OPND_QLF_S_H:
254 /* Index encoded in "Q:S:size<1>". */
255 QSsize = info->reglist.index << 1;
258 case AARCH64_OPND_QLF_S_S:
259 /* Index encoded in "Q:S". */
260 QSsize = info->reglist.index << 2;
263 case AARCH64_OPND_QLF_S_D:
264 /* Index encoded in "Q". */
265 QSsize = info->reglist.index << 3 | 0x1;
271 insert_fields (code, QSsize, 0, 3, FLD_vldst_size, FLD_S, FLD_Q);
272 gen_sub_field (FLD_asisdlso_opcode, 1, 2, &field);
273 insert_field_2 (&field, code, opcodeh2, 0);
278 /* Insert fields immh:immb and/or Q for e.g. the shift immediate in
279 SSHR <Vd>.<T>, <Vn>.<T>, #<shift>
280 or SSHR <V><d>, <V><n>, #<shift>. */
282 aarch64_ins_advsimd_imm_shift (const aarch64_operand *self ATTRIBUTE_UNUSED,
283 const aarch64_opnd_info *info,
284 aarch64_insn *code, const aarch64_inst *inst)
286 unsigned val = aarch64_get_qualifier_standard_value (info->qualifier);
289 if (inst->opcode->iclass == asimdshf)
293 0000 x SEE AdvSIMD modified immediate
302 Q = (val & 0x1) ? 1 : 0;
303 insert_field (FLD_Q, code, Q, inst->opcode->mask);
307 assert (info->type == AARCH64_OPND_IMM_VLSR
308 || info->type == AARCH64_OPND_IMM_VLSL);
310 if (info->type == AARCH64_OPND_IMM_VLSR)
313 0000 SEE AdvSIMD modified immediate
314 0001 (16-UInt(immh:immb))
315 001x (32-UInt(immh:immb))
316 01xx (64-UInt(immh:immb))
317 1xxx (128-UInt(immh:immb)) */
318 imm = (16 << (unsigned)val) - info->imm.value;
322 0000 SEE AdvSIMD modified immediate
323 0001 (UInt(immh:immb)-8)
324 001x (UInt(immh:immb)-16)
325 01xx (UInt(immh:immb)-32)
326 1xxx (UInt(immh:immb)-64) */
327 imm = info->imm.value + (8 << (unsigned)val);
328 insert_fields (code, imm, 0, 2, FLD_immb, FLD_immh);
333 /* Insert fields for e.g. the immediate operands in
334 BFM <Wd>, <Wn>, #<immr>, #<imms>. */
336 aarch64_ins_imm (const aarch64_operand *self, const aarch64_opnd_info *info,
338 const aarch64_inst *inst ATTRIBUTE_UNUSED)
342 imm = info->imm.value;
343 if (operand_need_shift_by_two (self))
345 insert_all_fields (self, code, imm);
349 /* Insert immediate and its shift amount for e.g. the last operand in
350 MOVZ <Wd>, #<imm16>{, LSL #<shift>}. */
352 aarch64_ins_imm_half (const aarch64_operand *self, const aarch64_opnd_info *info,
353 aarch64_insn *code, const aarch64_inst *inst)
356 aarch64_ins_imm (self, info, code, inst);
358 insert_field (FLD_hw, code, info->shifter.amount >> 4, 0);
362 /* Insert cmode and "a:b:c:d:e:f:g:h" fields for e.g. the last operand in
363 MOVI <Vd>.<T>, #<imm8> {, LSL #<amount>}. */
365 aarch64_ins_advsimd_imm_modified (const aarch64_operand *self ATTRIBUTE_UNUSED,
366 const aarch64_opnd_info *info,
368 const aarch64_inst *inst ATTRIBUTE_UNUSED)
370 enum aarch64_opnd_qualifier opnd0_qualifier = inst->operands[0].qualifier;
371 uint64_t imm = info->imm.value;
372 enum aarch64_modifier_kind kind = info->shifter.kind;
373 int amount = info->shifter.amount;
374 aarch64_field field = {0, 0};
376 /* a:b:c:d:e:f:g:h */
377 if (!info->imm.is_fp && aarch64_get_qualifier_esize (opnd0_qualifier) == 8)
379 /* Either MOVI <Dd>, #<imm>
380 or MOVI <Vd>.2D, #<imm>.
381 <imm> is a 64-bit immediate
382 "aaaaaaaabbbbbbbbccccccccddddddddeeeeeeeeffffffffgggggggghhhhhhhh",
383 encoded in "a:b:c:d:e:f:g:h". */
384 imm = aarch64_shrink_expanded_imm8 (imm);
385 assert ((int)imm >= 0);
387 insert_fields (code, imm, 0, 2, FLD_defgh, FLD_abc);
389 if (kind == AARCH64_MOD_NONE)
392 /* shift amount partially in cmode */
393 assert (kind == AARCH64_MOD_LSL || kind == AARCH64_MOD_MSL);
394 if (kind == AARCH64_MOD_LSL)
396 /* AARCH64_MOD_LSL: shift zeros. */
397 int esize = aarch64_get_qualifier_esize (opnd0_qualifier);
398 assert (esize == 4 || esize == 2 || esize == 1);
399 /* For 8-bit move immediate, the optional LSL #0 does not require
405 gen_sub_field (FLD_cmode, 1, 2, &field); /* per word */
407 gen_sub_field (FLD_cmode, 1, 1, &field); /* per halfword */
411 /* AARCH64_MOD_MSL: shift ones. */
413 gen_sub_field (FLD_cmode, 0, 1, &field); /* per word */
415 insert_field_2 (&field, code, amount, 0);
420 /* Insert fields for an 8-bit floating-point immediate. */
422 aarch64_ins_fpimm (const aarch64_operand *self, const aarch64_opnd_info *info,
424 const aarch64_inst *inst ATTRIBUTE_UNUSED)
426 insert_all_fields (self, code, info->imm.value);
430 /* Insert #<fbits> for the immediate operand in fp fix-point instructions,
431 e.g. SCVTF <Dd>, <Wn>, #<fbits>. */
433 aarch64_ins_fbits (const aarch64_operand *self, const aarch64_opnd_info *info,
435 const aarch64_inst *inst ATTRIBUTE_UNUSED)
437 insert_field (self->fields[0], code, 64 - info->imm.value, 0);
441 /* Insert arithmetic immediate for e.g. the last operand in
442 SUBS <Wd>, <Wn|WSP>, #<imm> {, <shift>}. */
444 aarch64_ins_aimm (const aarch64_operand *self, const aarch64_opnd_info *info,
445 aarch64_insn *code, const aarch64_inst *inst ATTRIBUTE_UNUSED)
448 aarch64_insn value = info->shifter.amount ? 1 : 0;
449 insert_field (self->fields[0], code, value, 0);
450 /* imm12 (unsigned) */
451 insert_field (self->fields[1], code, info->imm.value, 0);
455 /* Insert logical/bitmask immediate for e.g. the last operand in
456 ORR <Wd|WSP>, <Wn>, #<imm>. */
458 aarch64_ins_limm (const aarch64_operand *self, const aarch64_opnd_info *info,
459 aarch64_insn *code, const aarch64_inst *inst ATTRIBUTE_UNUSED)
462 uint64_t imm = info->imm.value;
463 int esize = aarch64_get_qualifier_esize (inst->operands[0].qualifier);
465 if (inst->opcode->op == OP_BIC)
467 if (aarch64_logical_immediate_p (imm, esize, &value) == FALSE)
468 /* The constraint check should have guaranteed this wouldn't happen. */
471 insert_fields (code, value, 0, 3, self->fields[2], self->fields[1],
476 /* Encode Ft for e.g. STR <Qt>, [<Xn|SP>, <R><m>{, <extend> {<amount>}}]
477 or LDP <Qt1>, <Qt2>, [<Xn|SP>], #<imm>. */
479 aarch64_ins_ft (const aarch64_operand *self, const aarch64_opnd_info *info,
480 aarch64_insn *code, const aarch64_inst *inst)
482 aarch64_insn value = 0;
484 assert (info->idx == 0);
487 aarch64_ins_regno (self, info, code, inst);
488 if (inst->opcode->iclass == ldstpair_indexed
489 || inst->opcode->iclass == ldstnapair_offs
490 || inst->opcode->iclass == ldstpair_off
491 || inst->opcode->iclass == loadlit)
494 switch (info->qualifier)
496 case AARCH64_OPND_QLF_S_S: value = 0; break;
497 case AARCH64_OPND_QLF_S_D: value = 1; break;
498 case AARCH64_OPND_QLF_S_Q: value = 2; break;
501 insert_field (FLD_ldst_size, code, value, 0);
506 value = aarch64_get_qualifier_standard_value (info->qualifier);
507 insert_fields (code, value, 0, 2, FLD_ldst_size, FLD_opc1);
513 /* Encode the address operand for e.g. STXRB <Ws>, <Wt>, [<Xn|SP>{,#0}]. */
515 aarch64_ins_addr_simple (const aarch64_operand *self ATTRIBUTE_UNUSED,
516 const aarch64_opnd_info *info, aarch64_insn *code,
517 const aarch64_inst *inst ATTRIBUTE_UNUSED)
520 insert_field (FLD_Rn, code, info->addr.base_regno, 0);
524 /* Encode the address operand for e.g.
525 STR <Qt>, [<Xn|SP>, <R><m>{, <extend> {<amount>}}]. */
527 aarch64_ins_addr_regoff (const aarch64_operand *self ATTRIBUTE_UNUSED,
528 const aarch64_opnd_info *info, aarch64_insn *code,
529 const aarch64_inst *inst ATTRIBUTE_UNUSED)
532 enum aarch64_modifier_kind kind = info->shifter.kind;
535 insert_field (FLD_Rn, code, info->addr.base_regno, 0);
537 insert_field (FLD_Rm, code, info->addr.offset.regno, 0);
539 if (kind == AARCH64_MOD_LSL)
540 kind = AARCH64_MOD_UXTX; /* Trick to enable the table-driven. */
541 insert_field (FLD_option, code, aarch64_get_operand_modifier_value (kind), 0);
543 if (info->qualifier != AARCH64_OPND_QLF_S_B)
544 S = info->shifter.amount != 0;
546 /* For STR <Bt>, [<Xn|SP>, <R><m>{, <extend> {<amount>}},
550 Must be #0 if <extend> is explicitly LSL. */
551 S = info->shifter.operator_present && info->shifter.amount_present;
552 insert_field (FLD_S, code, S, 0);
557 /* Encode the address operand for e.g. LDRSW <Xt>, [<Xn|SP>, #<simm>]!. */
559 aarch64_ins_addr_simm (const aarch64_operand *self,
560 const aarch64_opnd_info *info,
562 const aarch64_inst *inst ATTRIBUTE_UNUSED)
567 insert_field (FLD_Rn, code, info->addr.base_regno, 0);
568 /* simm (imm9 or imm7) */
569 imm = info->addr.offset.imm;
570 if (self->fields[0] == FLD_imm7)
571 /* scaled immediate in ld/st pair instructions.. */
572 imm >>= get_logsz (aarch64_get_qualifier_esize (info->qualifier));
573 insert_field (self->fields[0], code, imm, 0);
574 /* pre/post- index */
575 if (info->addr.writeback)
577 assert (inst->opcode->iclass != ldst_unscaled
578 && inst->opcode->iclass != ldstnapair_offs
579 && inst->opcode->iclass != ldstpair_off
580 && inst->opcode->iclass != ldst_unpriv);
581 assert (info->addr.preind != info->addr.postind);
582 if (info->addr.preind)
583 insert_field (self->fields[1], code, 1, 0);
589 /* Encode the address operand for e.g. LDRSW <Xt>, [<Xn|SP>{, #<pimm>}]. */
591 aarch64_ins_addr_uimm12 (const aarch64_operand *self,
592 const aarch64_opnd_info *info,
594 const aarch64_inst *inst ATTRIBUTE_UNUSED)
596 int shift = get_logsz (aarch64_get_qualifier_esize (info->qualifier));
599 insert_field (self->fields[0], code, info->addr.base_regno, 0);
601 insert_field (self->fields[1], code,info->addr.offset.imm >> shift, 0);
605 /* Encode the address operand for e.g.
606 LD1 {<Vt>.<T>, <Vt2>.<T>, <Vt3>.<T>}, [<Xn|SP>], <Xm|#<amount>>. */
608 aarch64_ins_simd_addr_post (const aarch64_operand *self ATTRIBUTE_UNUSED,
609 const aarch64_opnd_info *info, aarch64_insn *code,
610 const aarch64_inst *inst ATTRIBUTE_UNUSED)
613 insert_field (FLD_Rn, code, info->addr.base_regno, 0);
615 if (info->addr.offset.is_reg)
616 insert_field (FLD_Rm, code, info->addr.offset.regno, 0);
618 insert_field (FLD_Rm, code, 0x1f, 0);
622 /* Encode the condition operand for e.g. CSEL <Xd>, <Xn>, <Xm>, <cond>. */
624 aarch64_ins_cond (const aarch64_operand *self ATTRIBUTE_UNUSED,
625 const aarch64_opnd_info *info, aarch64_insn *code,
626 const aarch64_inst *inst ATTRIBUTE_UNUSED)
629 insert_field (FLD_cond, code, info->cond->value, 0);
633 /* Encode the system register operand for e.g. MRS <Xt>, <systemreg>. */
635 aarch64_ins_sysreg (const aarch64_operand *self ATTRIBUTE_UNUSED,
636 const aarch64_opnd_info *info, aarch64_insn *code,
637 const aarch64_inst *inst ATTRIBUTE_UNUSED)
639 /* op0:op1:CRn:CRm:op2 */
640 insert_fields (code, info->sysreg, inst->opcode->mask, 5,
641 FLD_op2, FLD_CRm, FLD_CRn, FLD_op1, FLD_op0);
645 /* Encode the PSTATE field operand for e.g. MSR <pstatefield>, #<imm>. */
647 aarch64_ins_pstatefield (const aarch64_operand *self ATTRIBUTE_UNUSED,
648 const aarch64_opnd_info *info, aarch64_insn *code,
649 const aarch64_inst *inst ATTRIBUTE_UNUSED)
652 insert_fields (code, info->pstatefield, inst->opcode->mask, 2,
657 /* Encode the system instruction op operand for e.g. AT <at_op>, <Xt>. */
659 aarch64_ins_sysins_op (const aarch64_operand *self ATTRIBUTE_UNUSED,
660 const aarch64_opnd_info *info, aarch64_insn *code,
661 const aarch64_inst *inst ATTRIBUTE_UNUSED)
663 /* op1:CRn:CRm:op2 */
664 insert_fields (code, info->sysins_op->value, inst->opcode->mask, 4,
665 FLD_op2, FLD_CRm, FLD_CRn, FLD_op1);
669 /* Encode the memory barrier option operand for e.g. DMB <option>|#<imm>. */
672 aarch64_ins_barrier (const aarch64_operand *self ATTRIBUTE_UNUSED,
673 const aarch64_opnd_info *info, aarch64_insn *code,
674 const aarch64_inst *inst ATTRIBUTE_UNUSED)
677 insert_field (FLD_CRm, code, info->barrier->value, 0);
681 /* Encode the prefetch operation option operand for e.g.
682 PRFM <prfop>, [<Xn|SP>{, #<pimm>}]. */
685 aarch64_ins_prfop (const aarch64_operand *self ATTRIBUTE_UNUSED,
686 const aarch64_opnd_info *info, aarch64_insn *code,
687 const aarch64_inst *inst ATTRIBUTE_UNUSED)
690 insert_field (FLD_Rt, code, info->prfop->value, 0);
694 /* Encode the hint number for instructions that alias HINT but take an
698 aarch64_ins_hint (const aarch64_operand *self ATTRIBUTE_UNUSED,
699 const aarch64_opnd_info *info, aarch64_insn *code,
700 const aarch64_inst *inst ATTRIBUTE_UNUSED)
703 insert_fields (code, info->hint_option->value, 0, 2, FLD_op2, FLD_CRm);
707 /* Encode the extended register operand for e.g.
708 STR <Qt>, [<Xn|SP>, <R><m>{, <extend> {<amount>}}]. */
710 aarch64_ins_reg_extended (const aarch64_operand *self ATTRIBUTE_UNUSED,
711 const aarch64_opnd_info *info, aarch64_insn *code,
712 const aarch64_inst *inst ATTRIBUTE_UNUSED)
714 enum aarch64_modifier_kind kind;
717 insert_field (FLD_Rm, code, info->reg.regno, 0);
719 kind = info->shifter.kind;
720 if (kind == AARCH64_MOD_LSL)
721 kind = info->qualifier == AARCH64_OPND_QLF_W
722 ? AARCH64_MOD_UXTW : AARCH64_MOD_UXTX;
723 insert_field (FLD_option, code, aarch64_get_operand_modifier_value (kind), 0);
725 insert_field (FLD_imm3, code, info->shifter.amount, 0);
730 /* Encode the shifted register operand for e.g.
731 SUBS <Xd>, <Xn>, <Xm> {, <shift> #<amount>}. */
733 aarch64_ins_reg_shifted (const aarch64_operand *self ATTRIBUTE_UNUSED,
734 const aarch64_opnd_info *info, aarch64_insn *code,
735 const aarch64_inst *inst ATTRIBUTE_UNUSED)
738 insert_field (FLD_Rm, code, info->reg.regno, 0);
740 insert_field (FLD_shift, code,
741 aarch64_get_operand_modifier_value (info->shifter.kind), 0);
743 insert_field (FLD_imm6, code, info->shifter.amount, 0);
748 /* Encode Zn[MM], where MM has a 7-bit triangular encoding. The fields
749 array specifies which field to use for Zn. MM is encoded in the
750 concatenation of imm5 and SVE_tszh, with imm5 being the less
753 aarch64_ins_sve_index (const aarch64_operand *self,
754 const aarch64_opnd_info *info, aarch64_insn *code,
755 const aarch64_inst *inst ATTRIBUTE_UNUSED)
757 unsigned int esize = aarch64_get_qualifier_esize (info->qualifier);
758 insert_field (self->fields[0], code, info->reglane.regno, 0);
759 insert_fields (code, (info->reglane.index * 2 + 1) * esize, 0,
760 2, FLD_imm5, FLD_SVE_tszh);
764 /* Encode {Zn.<T> - Zm.<T>}. The fields array specifies which field
767 aarch64_ins_sve_reglist (const aarch64_operand *self,
768 const aarch64_opnd_info *info, aarch64_insn *code,
769 const aarch64_inst *inst ATTRIBUTE_UNUSED)
771 insert_field (self->fields[0], code, info->reglist.first_regno, 0);
775 /* Miscellaneous encoding functions. */
777 /* Encode size[0], i.e. bit 22, for
778 e.g. FCVTN<Q> <Vd>.<Tb>, <Vn>.<Ta>. */
781 encode_asimd_fcvt (aarch64_inst *inst)
784 aarch64_field field = {0, 0};
785 enum aarch64_opnd_qualifier qualifier;
787 switch (inst->opcode->op)
791 /* FCVTN<Q> <Vd>.<Tb>, <Vn>.<Ta>. */
792 qualifier = inst->operands[1].qualifier;
796 /* FCVTL<Q> <Vd>.<Ta>, <Vn>.<Tb>. */
797 qualifier = inst->operands[0].qualifier;
802 assert (qualifier == AARCH64_OPND_QLF_V_4S
803 || qualifier == AARCH64_OPND_QLF_V_2D);
804 value = (qualifier == AARCH64_OPND_QLF_V_4S) ? 0 : 1;
805 gen_sub_field (FLD_size, 0, 1, &field);
806 insert_field_2 (&field, &inst->value, value, 0);
809 /* Encode size[0], i.e. bit 22, for
810 e.g. FCVTXN <Vb><d>, <Va><n>. */
813 encode_asisd_fcvtxn (aarch64_inst *inst)
815 aarch64_insn val = 1;
816 aarch64_field field = {0, 0};
817 assert (inst->operands[0].qualifier == AARCH64_OPND_QLF_S_S);
818 gen_sub_field (FLD_size, 0, 1, &field);
819 insert_field_2 (&field, &inst->value, val, 0);
822 /* Encode the 'opc' field for e.g. FCVT <Dd>, <Sn>. */
824 encode_fcvt (aarch64_inst *inst)
827 const aarch64_field field = {15, 2};
830 switch (inst->operands[0].qualifier)
832 case AARCH64_OPND_QLF_S_S: val = 0; break;
833 case AARCH64_OPND_QLF_S_D: val = 1; break;
834 case AARCH64_OPND_QLF_S_H: val = 3; break;
837 insert_field_2 (&field, &inst->value, val, 0);
842 /* Do miscellaneous encodings that are not common enough to be driven by
846 do_misc_encoding (aarch64_inst *inst)
848 switch (inst->opcode->op)
857 encode_asimd_fcvt (inst);
860 encode_asisd_fcvtxn (inst);
866 /* Encode the 'size' and 'Q' field for e.g. SHADD. */
868 encode_sizeq (aarch64_inst *inst)
871 enum aarch64_field_kind kind;
874 /* Get the index of the operand whose information we are going to use
875 to encode the size and Q fields.
876 This is deduced from the possible valid qualifier lists. */
877 idx = aarch64_select_operand_for_sizeq_field_coding (inst->opcode);
878 DEBUG_TRACE ("idx: %d; qualifier: %s", idx,
879 aarch64_get_qualifier_name (inst->operands[idx].qualifier));
880 sizeq = aarch64_get_qualifier_standard_value (inst->operands[idx].qualifier);
882 insert_field (FLD_Q, &inst->value, sizeq & 0x1, inst->opcode->mask);
884 if (inst->opcode->iclass == asisdlse
885 || inst->opcode->iclass == asisdlsep
886 || inst->opcode->iclass == asisdlso
887 || inst->opcode->iclass == asisdlsop)
888 kind = FLD_vldst_size;
891 insert_field (kind, &inst->value, (sizeq >> 1) & 0x3, inst->opcode->mask);
894 /* Opcodes that have fields shared by multiple operands are usually flagged
895 with flags. In this function, we detect such flags and use the
896 information in one of the related operands to do the encoding. The 'one'
897 operand is not any operand but one of the operands that has the enough
898 information for such an encoding. */
901 do_special_encoding (struct aarch64_inst *inst)
904 aarch64_insn value = 0;
906 DEBUG_TRACE ("enter with coding 0x%x", (uint32_t) inst->value);
908 /* Condition for truly conditional executed instructions, e.g. b.cond. */
909 if (inst->opcode->flags & F_COND)
911 insert_field (FLD_cond2, &inst->value, inst->cond->value, 0);
913 if (inst->opcode->flags & F_SF)
915 idx = select_operand_for_sf_field_coding (inst->opcode);
916 value = (inst->operands[idx].qualifier == AARCH64_OPND_QLF_X
917 || inst->operands[idx].qualifier == AARCH64_OPND_QLF_SP)
919 insert_field (FLD_sf, &inst->value, value, 0);
920 if (inst->opcode->flags & F_N)
921 insert_field (FLD_N, &inst->value, value, inst->opcode->mask);
923 if (inst->opcode->flags & F_LSE_SZ)
925 idx = select_operand_for_sf_field_coding (inst->opcode);
926 value = (inst->operands[idx].qualifier == AARCH64_OPND_QLF_X
927 || inst->operands[idx].qualifier == AARCH64_OPND_QLF_SP)
929 insert_field (FLD_lse_sz, &inst->value, value, 0);
931 if (inst->opcode->flags & F_SIZEQ)
933 if (inst->opcode->flags & F_FPTYPE)
935 idx = select_operand_for_fptype_field_coding (inst->opcode);
936 switch (inst->operands[idx].qualifier)
938 case AARCH64_OPND_QLF_S_S: value = 0; break;
939 case AARCH64_OPND_QLF_S_D: value = 1; break;
940 case AARCH64_OPND_QLF_S_H: value = 3; break;
943 insert_field (FLD_type, &inst->value, value, 0);
945 if (inst->opcode->flags & F_SSIZE)
947 enum aarch64_opnd_qualifier qualifier;
948 idx = select_operand_for_scalar_size_field_coding (inst->opcode);
949 qualifier = inst->operands[idx].qualifier;
950 assert (qualifier >= AARCH64_OPND_QLF_S_B
951 && qualifier <= AARCH64_OPND_QLF_S_Q);
952 value = aarch64_get_qualifier_standard_value (qualifier);
953 insert_field (FLD_size, &inst->value, value, inst->opcode->mask);
955 if (inst->opcode->flags & F_T)
957 int num; /* num of consecutive '0's on the right side of imm5<3:0>. */
958 aarch64_field field = {0, 0};
959 enum aarch64_opnd_qualifier qualifier;
962 qualifier = inst->operands[idx].qualifier;
963 assert (aarch64_get_operand_class (inst->opcode->operands[0])
964 == AARCH64_OPND_CLASS_SIMD_REG
965 && qualifier >= AARCH64_OPND_QLF_V_8B
966 && qualifier <= AARCH64_OPND_QLF_V_2D);
977 value = aarch64_get_qualifier_standard_value (qualifier);
978 insert_field (FLD_Q, &inst->value, value & 0x1, inst->opcode->mask);
979 num = (int) value >> 1;
980 assert (num >= 0 && num <= 3);
981 gen_sub_field (FLD_imm5, 0, num + 1, &field);
982 insert_field_2 (&field, &inst->value, 1 << num, inst->opcode->mask);
984 if (inst->opcode->flags & F_GPRSIZE_IN_Q)
986 /* Use Rt to encode in the case of e.g.
987 STXP <Ws>, <Xt1>, <Xt2>, [<Xn|SP>{,#0}]. */
988 enum aarch64_opnd_qualifier qualifier;
989 idx = aarch64_operand_index (inst->opcode->operands, AARCH64_OPND_Rt);
991 /* Otherwise use the result operand, which has to be a integer
994 assert (idx == 0 || idx == 1);
995 assert (aarch64_get_operand_class (inst->opcode->operands[idx])
996 == AARCH64_OPND_CLASS_INT_REG);
997 qualifier = inst->operands[idx].qualifier;
998 insert_field (FLD_Q, &inst->value,
999 aarch64_get_qualifier_standard_value (qualifier), 0);
1001 if (inst->opcode->flags & F_LDS_SIZE)
1003 /* e.g. LDRSB <Wt>, [<Xn|SP>, <R><m>{, <extend> {<amount>}}]. */
1004 enum aarch64_opnd_qualifier qualifier;
1005 aarch64_field field = {0, 0};
1006 assert (aarch64_get_operand_class (inst->opcode->operands[0])
1007 == AARCH64_OPND_CLASS_INT_REG);
1008 gen_sub_field (FLD_opc, 0, 1, &field);
1009 qualifier = inst->operands[0].qualifier;
1010 insert_field_2 (&field, &inst->value,
1011 1 - aarch64_get_qualifier_standard_value (qualifier), 0);
1013 /* Miscellaneous encoding as the last step. */
1014 if (inst->opcode->flags & F_MISC)
1015 do_misc_encoding (inst);
1017 DEBUG_TRACE ("exit with coding 0x%x", (uint32_t) inst->value);
1020 /* Converters converting an alias opcode instruction to its real form. */
1022 /* ROR <Wd>, <Ws>, #<shift>
1024 EXTR <Wd>, <Ws>, <Ws>, #<shift>. */
1026 convert_ror_to_extr (aarch64_inst *inst)
1028 copy_operand_info (inst, 3, 2);
1029 copy_operand_info (inst, 2, 1);
1032 /* UXTL<Q> <Vd>.<Ta>, <Vn>.<Tb>
1034 USHLL<Q> <Vd>.<Ta>, <Vn>.<Tb>, #0. */
1036 convert_xtl_to_shll (aarch64_inst *inst)
1038 inst->operands[2].qualifier = inst->operands[1].qualifier;
1039 inst->operands[2].imm.value = 0;
1043 LSR <Xd>, <Xn>, #<shift>
1045 UBFM <Xd>, <Xn>, #<shift>, #63. */
1047 convert_sr_to_bfm (aarch64_inst *inst)
1049 inst->operands[3].imm.value =
1050 inst->operands[2].qualifier == AARCH64_OPND_QLF_imm_0_31 ? 31 : 63;
1053 /* Convert MOV to ORR. */
1055 convert_mov_to_orr (aarch64_inst *inst)
1057 /* MOV <Vd>.<T>, <Vn>.<T>
1059 ORR <Vd>.<T>, <Vn>.<T>, <Vn>.<T>. */
1060 copy_operand_info (inst, 2, 1);
1063 /* When <imms> >= <immr>, the instruction written:
1064 SBFX <Xd>, <Xn>, #<lsb>, #<width>
1066 SBFM <Xd>, <Xn>, #<lsb>, #(<lsb>+<width>-1). */
1069 convert_bfx_to_bfm (aarch64_inst *inst)
1073 /* Convert the operand. */
1074 lsb = inst->operands[2].imm.value;
1075 width = inst->operands[3].imm.value;
1076 inst->operands[2].imm.value = lsb;
1077 inst->operands[3].imm.value = lsb + width - 1;
1080 /* When <imms> < <immr>, the instruction written:
1081 SBFIZ <Xd>, <Xn>, #<lsb>, #<width>
1083 SBFM <Xd>, <Xn>, #((64-<lsb>)&0x3f), #(<width>-1). */
1086 convert_bfi_to_bfm (aarch64_inst *inst)
1090 /* Convert the operand. */
1091 lsb = inst->operands[2].imm.value;
1092 width = inst->operands[3].imm.value;
1093 if (inst->operands[2].qualifier == AARCH64_OPND_QLF_imm_0_31)
1095 inst->operands[2].imm.value = (32 - lsb) & 0x1f;
1096 inst->operands[3].imm.value = width - 1;
1100 inst->operands[2].imm.value = (64 - lsb) & 0x3f;
1101 inst->operands[3].imm.value = width - 1;
1105 /* The instruction written:
1106 BFC <Xd>, #<lsb>, #<width>
1108 BFM <Xd>, XZR, #((64-<lsb>)&0x3f), #(<width>-1). */
1111 convert_bfc_to_bfm (aarch64_inst *inst)
1116 copy_operand_info (inst, 3, 2);
1117 copy_operand_info (inst, 2, 1);
1118 copy_operand_info (inst, 2, 0);
1119 inst->operands[1].reg.regno = 0x1f;
1121 /* Convert the immedate operand. */
1122 lsb = inst->operands[2].imm.value;
1123 width = inst->operands[3].imm.value;
1124 if (inst->operands[2].qualifier == AARCH64_OPND_QLF_imm_0_31)
1126 inst->operands[2].imm.value = (32 - lsb) & 0x1f;
1127 inst->operands[3].imm.value = width - 1;
1131 inst->operands[2].imm.value = (64 - lsb) & 0x3f;
1132 inst->operands[3].imm.value = width - 1;
1136 /* The instruction written:
1137 LSL <Xd>, <Xn>, #<shift>
1139 UBFM <Xd>, <Xn>, #((64-<shift>)&0x3f), #(63-<shift>). */
1142 convert_lsl_to_ubfm (aarch64_inst *inst)
1144 int64_t shift = inst->operands[2].imm.value;
1146 if (inst->operands[2].qualifier == AARCH64_OPND_QLF_imm_0_31)
1148 inst->operands[2].imm.value = (32 - shift) & 0x1f;
1149 inst->operands[3].imm.value = 31 - shift;
1153 inst->operands[2].imm.value = (64 - shift) & 0x3f;
1154 inst->operands[3].imm.value = 63 - shift;
1158 /* CINC <Wd>, <Wn>, <cond>
1160 CSINC <Wd>, <Wn>, <Wn>, invert(<cond>). */
1163 convert_to_csel (aarch64_inst *inst)
1165 copy_operand_info (inst, 3, 2);
1166 copy_operand_info (inst, 2, 1);
1167 inst->operands[3].cond = get_inverted_cond (inst->operands[3].cond);
1170 /* CSET <Wd>, <cond>
1172 CSINC <Wd>, WZR, WZR, invert(<cond>). */
1175 convert_cset_to_csinc (aarch64_inst *inst)
1177 copy_operand_info (inst, 3, 1);
1178 copy_operand_info (inst, 2, 0);
1179 copy_operand_info (inst, 1, 0);
1180 inst->operands[1].reg.regno = 0x1f;
1181 inst->operands[2].reg.regno = 0x1f;
1182 inst->operands[3].cond = get_inverted_cond (inst->operands[3].cond);
1187 MOVZ <Wd>, #<imm16>, LSL #<shift>. */
1190 convert_mov_to_movewide (aarch64_inst *inst)
1193 uint32_t shift_amount;
1196 switch (inst->opcode->op)
1198 case OP_MOV_IMM_WIDE:
1199 value = inst->operands[1].imm.value;
1201 case OP_MOV_IMM_WIDEN:
1202 value = ~inst->operands[1].imm.value;
1207 inst->operands[1].type = AARCH64_OPND_HALF;
1208 is32 = inst->operands[0].qualifier == AARCH64_OPND_QLF_W;
1209 if (! aarch64_wide_constant_p (value, is32, &shift_amount))
1210 /* The constraint check should have guaranteed this wouldn't happen. */
1212 value >>= shift_amount;
1214 inst->operands[1].imm.value = value;
1215 inst->operands[1].shifter.kind = AARCH64_MOD_LSL;
1216 inst->operands[1].shifter.amount = shift_amount;
1221 ORR <Wd>, WZR, #<imm>. */
1224 convert_mov_to_movebitmask (aarch64_inst *inst)
1226 copy_operand_info (inst, 2, 1);
1227 inst->operands[1].reg.regno = 0x1f;
1228 inst->operands[1].skip = 0;
1231 /* Some alias opcodes are assembled by being converted to their real-form. */
1234 convert_to_real (aarch64_inst *inst, const aarch64_opcode *real)
1236 const aarch64_opcode *alias = inst->opcode;
1238 if ((alias->flags & F_CONV) == 0)
1239 goto convert_to_real_return;
1245 convert_sr_to_bfm (inst);
1248 convert_lsl_to_ubfm (inst);
1253 convert_to_csel (inst);
1257 convert_cset_to_csinc (inst);
1262 convert_bfx_to_bfm (inst);
1267 convert_bfi_to_bfm (inst);
1270 convert_bfc_to_bfm (inst);
1273 convert_mov_to_orr (inst);
1275 case OP_MOV_IMM_WIDE:
1276 case OP_MOV_IMM_WIDEN:
1277 convert_mov_to_movewide (inst);
1279 case OP_MOV_IMM_LOG:
1280 convert_mov_to_movebitmask (inst);
1283 convert_ror_to_extr (inst);
1289 convert_xtl_to_shll (inst);
1295 convert_to_real_return:
1296 aarch64_replace_opcode (inst, real);
1299 /* Encode *INST_ORI of the opcode code OPCODE.
1300 Return the encoded result in *CODE and if QLF_SEQ is not NULL, return the
1301 matched operand qualifier sequence in *QLF_SEQ. */
1304 aarch64_opcode_encode (const aarch64_opcode *opcode,
1305 const aarch64_inst *inst_ori, aarch64_insn *code,
1306 aarch64_opnd_qualifier_t *qlf_seq,
1307 aarch64_operand_error *mismatch_detail)
1310 const aarch64_opcode *aliased;
1311 aarch64_inst copy, *inst;
1313 DEBUG_TRACE ("enter with %s", opcode->name);
1315 /* Create a copy of *INST_ORI, so that we can do any change we want. */
1319 assert (inst->opcode == NULL || inst->opcode == opcode);
1320 if (inst->opcode == NULL)
1321 inst->opcode = opcode;
1323 /* Constrain the operands.
1324 After passing this, the encoding is guaranteed to succeed. */
1325 if (aarch64_match_operands_constraint (inst, mismatch_detail) == 0)
1327 DEBUG_TRACE ("FAIL since operand constraint not met");
1331 /* Get the base value.
1332 Note: this has to be before the aliasing handling below in order to
1333 get the base value from the alias opcode before we move on to the
1334 aliased opcode for encoding. */
1335 inst->value = opcode->opcode;
1337 /* No need to do anything else if the opcode does not have any operand. */
1338 if (aarch64_num_of_operands (opcode) == 0)
1341 /* Assign operand indexes and check types. Also put the matched
1342 operand qualifiers in *QLF_SEQ to return. */
1343 for (i = 0; i < AARCH64_MAX_OPND_NUM; ++i)
1345 assert (opcode->operands[i] == inst->operands[i].type);
1346 inst->operands[i].idx = i;
1347 if (qlf_seq != NULL)
1348 *qlf_seq = inst->operands[i].qualifier;
1351 aliased = aarch64_find_real_opcode (opcode);
1352 /* If the opcode is an alias and it does not ask for direct encoding by
1353 itself, the instruction will be transformed to the form of real opcode
1354 and the encoding will be carried out using the rules for the aliased
1356 if (aliased != NULL && (opcode->flags & F_CONV))
1358 DEBUG_TRACE ("real opcode '%s' has been found for the alias %s",
1359 aliased->name, opcode->name);
1360 /* Convert the operands to the form of the real opcode. */
1361 convert_to_real (inst, aliased);
1365 aarch64_opnd_info *info = inst->operands;
1367 /* Call the inserter of each operand. */
1368 for (i = 0; i < AARCH64_MAX_OPND_NUM; ++i, ++info)
1370 const aarch64_operand *opnd;
1371 enum aarch64_opnd type = opcode->operands[i];
1372 if (type == AARCH64_OPND_NIL)
1376 DEBUG_TRACE ("skip the incomplete operand %d", i);
1379 opnd = &aarch64_operands[type];
1380 if (operand_has_inserter (opnd))
1381 aarch64_insert_operand (opnd, info, &inst->value, inst);
1384 /* Call opcode encoders indicated by flags. */
1385 if (opcode_has_special_coder (opcode))
1386 do_special_encoding (inst);
1389 DEBUG_TRACE ("exit with %s", opcode->name);
1391 *code = inst->value;