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 "aarch64-asm.h"
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.
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 fields H:L:M should be passed in
35 the order of M, L, H. */
38 insert_fields (aarch64_insn *code, aarch64_insn value, aarch64_insn mask, ...)
41 const aarch64_field *field;
42 enum aarch64_field_kind kind;
46 num = va_arg (va, uint32_t);
50 kind = va_arg (va, enum aarch64_field_kind);
51 field = &fields[kind];
52 insert_field (kind, code, value, mask);
53 value >>= field->width;
58 /* Operand inserters. */
60 /* Insert register number. */
62 aarch64_ins_regno (const aarch64_operand *self, const aarch64_opnd_info *info,
64 const aarch64_inst *inst ATTRIBUTE_UNUSED)
66 insert_field (self->fields[0], code, info->reg.regno, 0);
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>]. */
74 aarch64_ins_reglane (const aarch64_operand *self, const aarch64_opnd_info *info,
75 aarch64_insn *code, const aarch64_inst *inst)
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)
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)
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);
93 /* index and type for e.g. DUP <V><d>, <Vn>.<T>[<index>].
100 aarch64_insn value = ((info->reglane.index << 1) | 1) << pos;
101 insert_field (FLD_imm5, code, value, 0);
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)
110 case AARCH64_OPND_QLF_S_H:
112 insert_fields (code, info->reglane.index, 0, 3, FLD_M, FLD_L, FLD_H);
114 case AARCH64_OPND_QLF_S_S:
116 insert_fields (code, info->reglane.index, 0, 2, FLD_L, FLD_H);
118 case AARCH64_OPND_QLF_S_D:
120 insert_field (FLD_H, code, info->reglane.index, 0);
129 /* Insert regno and len field of a register list operand, e.g. Vn in TBL. */
131 aarch64_ins_reglist (const aarch64_operand *self, const aarch64_opnd_info *info,
133 const aarch64_inst *inst ATTRIBUTE_UNUSED)
136 insert_field (self->fields[0], code, info->reglist.first_regno, 0);
138 insert_field (FLD_len, code, info->reglist.num_regs - 1, 0);
142 /* Insert Rt and opcode fields for a register list operand, e.g. Vt
143 in AdvSIMD load/store instructions. */
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)
149 aarch64_insn value = 0;
150 /* Number of elements in each structure to be loaded/stored. */
151 unsigned num = get_opcode_dependent_value (inst->opcode);
154 insert_field (FLD_Rt, code, info->reglist.first_regno, 0);
159 switch (info->reglist.num_regs)
161 case 1: value = 0x7; break;
162 case 2: value = 0xa; break;
163 case 3: value = 0x6; break;
164 case 4: value = 0x2; break;
169 value = info->reglist.num_regs == 4 ? 0x3 : 0x8;
180 insert_field (FLD_opcode, code, value, 0);
185 /* Insert Rt and S fields for a register list operand, e.g. Vt in AdvSIMD load
186 single structure to all lanes instructions. */
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)
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;
198 insert_field (FLD_Rt, code, info->reglist.first_regno, 0);
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"
204 value = (aarch64_insn) 1;
205 insert_field (FLD_S, code, value, 0);
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. */
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)
217 aarch64_field field = {0, 0};
218 aarch64_insn QSsize = 0; /* fields Q:S:size. */
219 aarch64_insn opcodeh2 = 0; /* opcode<2:1> */
221 assert (info->reglist.has_index);
224 insert_field (FLD_Rt, code, info->reglist.first_regno, 0);
225 /* Encode the index, opcode<2:1> and size. */
226 switch (info->qualifier)
228 case AARCH64_OPND_QLF_S_B:
229 /* Index encoded in "Q:S:size". */
230 QSsize = info->reglist.index;
233 case AARCH64_OPND_QLF_S_H:
234 /* Index encoded in "Q:S:size<1>". */
235 QSsize = info->reglist.index << 1;
238 case AARCH64_OPND_QLF_S_S:
239 /* Index encoded in "Q:S". */
240 QSsize = info->reglist.index << 2;
243 case AARCH64_OPND_QLF_S_D:
244 /* Index encoded in "Q". */
245 QSsize = info->reglist.index << 3 | 0x1;
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);
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>. */
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)
266 unsigned val = aarch64_get_qualifier_standard_value (info->qualifier);
269 if (inst->opcode->iclass == asimdshf)
273 0000 x SEE AdvSIMD modified immediate
282 Q = (val & 0x1) ? 1 : 0;
283 insert_field (FLD_Q, code, Q, inst->opcode->mask);
287 assert (info->type == AARCH64_OPND_IMM_VLSR
288 || info->type == AARCH64_OPND_IMM_VLSL);
290 if (info->type == AARCH64_OPND_IMM_VLSR)
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;
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);
313 /* Insert fields for e.g. the immediate operands in
314 BFM <Wd>, <Wn>, #<immr>, #<imms>. */
316 aarch64_ins_imm (const aarch64_operand *self, const aarch64_opnd_info *info,
318 const aarch64_inst *inst ATTRIBUTE_UNUSED)
321 /* Maximum of two fields to insert. */
322 assert (self->fields[2] == FLD_NIL);
324 imm = info->imm.value;
325 if (operand_need_shift_by_two (self))
327 if (self->fields[1] == FLD_NIL)
328 insert_field (self->fields[0], code, imm, 0);
330 /* e.g. TBZ b5:b40. */
331 insert_fields (code, imm, 0, 2, self->fields[1], self->fields[0]);
335 /* Insert immediate and its shift amount for e.g. the last operand in
336 MOVZ <Wd>, #<imm16>{, LSL #<shift>}. */
338 aarch64_ins_imm_half (const aarch64_operand *self, const aarch64_opnd_info *info,
339 aarch64_insn *code, const aarch64_inst *inst)
342 aarch64_ins_imm (self, info, code, inst);
344 insert_field (FLD_hw, code, info->shifter.amount >> 4, 0);
348 /* Insert cmode and "a:b:c:d:e:f:g:h" fields for e.g. the last operand in
349 MOVI <Vd>.<T>, #<imm8> {, LSL #<amount>}. */
351 aarch64_ins_advsimd_imm_modified (const aarch64_operand *self ATTRIBUTE_UNUSED,
352 const aarch64_opnd_info *info,
354 const aarch64_inst *inst ATTRIBUTE_UNUSED)
356 enum aarch64_opnd_qualifier opnd0_qualifier = inst->operands[0].qualifier;
357 uint64_t imm = info->imm.value;
358 enum aarch64_modifier_kind kind = info->shifter.kind;
359 int amount = info->shifter.amount;
360 aarch64_field field = {0, 0};
362 /* a:b:c:d:e:f:g:h */
363 if (!info->imm.is_fp && aarch64_get_qualifier_esize (opnd0_qualifier) == 8)
365 /* Either MOVI <Dd>, #<imm>
366 or MOVI <Vd>.2D, #<imm>.
367 <imm> is a 64-bit immediate
368 "aaaaaaaabbbbbbbbccccccccddddddddeeeeeeeeffffffffgggggggghhhhhhhh",
369 encoded in "a:b:c:d:e:f:g:h". */
370 imm = aarch64_shrink_expanded_imm8 (imm);
371 assert ((int)imm >= 0);
373 insert_fields (code, imm, 0, 2, FLD_defgh, FLD_abc);
375 if (kind == AARCH64_MOD_NONE)
378 /* shift amount partially in cmode */
379 assert (kind == AARCH64_MOD_LSL || kind == AARCH64_MOD_MSL);
380 if (kind == AARCH64_MOD_LSL)
382 /* AARCH64_MOD_LSL: shift zeros. */
383 int esize = aarch64_get_qualifier_esize (opnd0_qualifier);
384 assert (esize == 4 || esize == 2 || esize == 1);
385 /* For 8-bit move immediate, the optional LSL #0 does not require
391 gen_sub_field (FLD_cmode, 1, 2, &field); /* per word */
393 gen_sub_field (FLD_cmode, 1, 1, &field); /* per halfword */
397 /* AARCH64_MOD_MSL: shift ones. */
399 gen_sub_field (FLD_cmode, 0, 1, &field); /* per word */
401 insert_field_2 (&field, code, amount, 0);
406 /* Insert #<fbits> for the immediate operand in fp fix-point instructions,
407 e.g. SCVTF <Dd>, <Wn>, #<fbits>. */
409 aarch64_ins_fbits (const aarch64_operand *self, const aarch64_opnd_info *info,
411 const aarch64_inst *inst ATTRIBUTE_UNUSED)
413 insert_field (self->fields[0], code, 64 - info->imm.value, 0);
417 /* Insert arithmetic immediate for e.g. the last operand in
418 SUBS <Wd>, <Wn|WSP>, #<imm> {, <shift>}. */
420 aarch64_ins_aimm (const aarch64_operand *self, const aarch64_opnd_info *info,
421 aarch64_insn *code, const aarch64_inst *inst ATTRIBUTE_UNUSED)
424 aarch64_insn value = info->shifter.amount ? 1 : 0;
425 insert_field (self->fields[0], code, value, 0);
426 /* imm12 (unsigned) */
427 insert_field (self->fields[1], code, info->imm.value, 0);
431 /* Insert logical/bitmask immediate for e.g. the last operand in
432 ORR <Wd|WSP>, <Wn>, #<imm>. */
434 aarch64_ins_limm (const aarch64_operand *self, const aarch64_opnd_info *info,
435 aarch64_insn *code, const aarch64_inst *inst ATTRIBUTE_UNUSED)
438 uint64_t imm = info->imm.value;
439 int is32 = aarch64_get_qualifier_esize (inst->operands[0].qualifier) == 4;
441 if (inst->opcode->op == OP_BIC)
443 if (aarch64_logical_immediate_p (imm, is32, &value) == FALSE)
444 /* The constraint check should have guaranteed this wouldn't happen. */
447 insert_fields (code, value, 0, 3, self->fields[2], self->fields[1],
452 /* Encode Ft for e.g. STR <Qt>, [<Xn|SP>, <R><m>{, <extend> {<amount>}}]
453 or LDP <Qt1>, <Qt2>, [<Xn|SP>], #<imm>. */
455 aarch64_ins_ft (const aarch64_operand *self, const aarch64_opnd_info *info,
456 aarch64_insn *code, const aarch64_inst *inst)
458 aarch64_insn value = 0;
460 assert (info->idx == 0);
463 aarch64_ins_regno (self, info, code, inst);
464 if (inst->opcode->iclass == ldstpair_indexed
465 || inst->opcode->iclass == ldstnapair_offs
466 || inst->opcode->iclass == ldstpair_off
467 || inst->opcode->iclass == loadlit)
470 switch (info->qualifier)
472 case AARCH64_OPND_QLF_S_S: value = 0; break;
473 case AARCH64_OPND_QLF_S_D: value = 1; break;
474 case AARCH64_OPND_QLF_S_Q: value = 2; break;
477 insert_field (FLD_ldst_size, code, value, 0);
482 value = aarch64_get_qualifier_standard_value (info->qualifier);
483 insert_fields (code, value, 0, 2, FLD_ldst_size, FLD_opc1);
489 /* Encode the address operand for e.g. STXRB <Ws>, <Wt>, [<Xn|SP>{,#0}]. */
491 aarch64_ins_addr_simple (const aarch64_operand *self ATTRIBUTE_UNUSED,
492 const aarch64_opnd_info *info, aarch64_insn *code,
493 const aarch64_inst *inst ATTRIBUTE_UNUSED)
496 insert_field (FLD_Rn, code, info->addr.base_regno, 0);
500 /* Encode the address operand for e.g.
501 STR <Qt>, [<Xn|SP>, <R><m>{, <extend> {<amount>}}]. */
503 aarch64_ins_addr_regoff (const aarch64_operand *self ATTRIBUTE_UNUSED,
504 const aarch64_opnd_info *info, aarch64_insn *code,
505 const aarch64_inst *inst ATTRIBUTE_UNUSED)
508 enum aarch64_modifier_kind kind = info->shifter.kind;
511 insert_field (FLD_Rn, code, info->addr.base_regno, 0);
513 insert_field (FLD_Rm, code, info->addr.offset.regno, 0);
515 if (kind == AARCH64_MOD_LSL)
516 kind = AARCH64_MOD_UXTX; /* Trick to enable the table-driven. */
517 insert_field (FLD_option, code, aarch64_get_operand_modifier_value (kind), 0);
519 if (info->qualifier != AARCH64_OPND_QLF_S_B)
520 S = info->shifter.amount != 0;
522 /* For STR <Bt>, [<Xn|SP>, <R><m>{, <extend> {<amount>}},
526 Must be #0 if <extend> is explicitly LSL. */
527 S = info->shifter.operator_present && info->shifter.amount_present;
528 insert_field (FLD_S, code, S, 0);
533 /* Encode the address operand for e.g. LDRSW <Xt>, [<Xn|SP>, #<simm>]!. */
535 aarch64_ins_addr_simm (const aarch64_operand *self,
536 const aarch64_opnd_info *info,
538 const aarch64_inst *inst ATTRIBUTE_UNUSED)
543 insert_field (FLD_Rn, code, info->addr.base_regno, 0);
544 /* simm (imm9 or imm7) */
545 imm = info->addr.offset.imm;
546 if (self->fields[0] == FLD_imm7)
547 /* scaled immediate in ld/st pair instructions.. */
548 imm >>= get_logsz (aarch64_get_qualifier_esize (info->qualifier));
549 insert_field (self->fields[0], code, imm, 0);
550 /* pre/post- index */
551 if (info->addr.writeback)
553 assert (inst->opcode->iclass != ldst_unscaled
554 && inst->opcode->iclass != ldstnapair_offs
555 && inst->opcode->iclass != ldstpair_off
556 && inst->opcode->iclass != ldst_unpriv);
557 assert (info->addr.preind != info->addr.postind);
558 if (info->addr.preind)
559 insert_field (self->fields[1], code, 1, 0);
565 /* Encode the address operand for e.g. LDRSW <Xt>, [<Xn|SP>{, #<pimm>}]. */
567 aarch64_ins_addr_uimm12 (const aarch64_operand *self,
568 const aarch64_opnd_info *info,
570 const aarch64_inst *inst ATTRIBUTE_UNUSED)
572 int shift = get_logsz (aarch64_get_qualifier_esize (info->qualifier));
575 insert_field (self->fields[0], code, info->addr.base_regno, 0);
577 insert_field (self->fields[1], code,info->addr.offset.imm >> shift, 0);
581 /* Encode the address operand for e.g.
582 LD1 {<Vt>.<T>, <Vt2>.<T>, <Vt3>.<T>}, [<Xn|SP>], <Xm|#<amount>>. */
584 aarch64_ins_simd_addr_post (const aarch64_operand *self ATTRIBUTE_UNUSED,
585 const aarch64_opnd_info *info, aarch64_insn *code,
586 const aarch64_inst *inst ATTRIBUTE_UNUSED)
589 insert_field (FLD_Rn, code, info->addr.base_regno, 0);
591 if (info->addr.offset.is_reg)
592 insert_field (FLD_Rm, code, info->addr.offset.regno, 0);
594 insert_field (FLD_Rm, code, 0x1f, 0);
598 /* Encode the condition operand for e.g. CSEL <Xd>, <Xn>, <Xm>, <cond>. */
600 aarch64_ins_cond (const aarch64_operand *self ATTRIBUTE_UNUSED,
601 const aarch64_opnd_info *info, aarch64_insn *code,
602 const aarch64_inst *inst ATTRIBUTE_UNUSED)
605 insert_field (FLD_cond, code, info->cond->value, 0);
609 /* Encode the system register operand for e.g. MRS <Xt>, <systemreg>. */
611 aarch64_ins_sysreg (const aarch64_operand *self ATTRIBUTE_UNUSED,
612 const aarch64_opnd_info *info, aarch64_insn *code,
613 const aarch64_inst *inst ATTRIBUTE_UNUSED)
615 /* op0:op1:CRn:CRm:op2 */
616 insert_fields (code, info->sysreg, inst->opcode->mask, 5,
617 FLD_op2, FLD_CRm, FLD_CRn, FLD_op1, FLD_op0);
621 /* Encode the PSTATE field operand for e.g. MSR <pstatefield>, #<imm>. */
623 aarch64_ins_pstatefield (const aarch64_operand *self ATTRIBUTE_UNUSED,
624 const aarch64_opnd_info *info, aarch64_insn *code,
625 const aarch64_inst *inst ATTRIBUTE_UNUSED)
628 insert_fields (code, info->pstatefield, inst->opcode->mask, 2,
633 /* Encode the system instruction op operand for e.g. AT <at_op>, <Xt>. */
635 aarch64_ins_sysins_op (const aarch64_operand *self ATTRIBUTE_UNUSED,
636 const aarch64_opnd_info *info, aarch64_insn *code,
637 const aarch64_inst *inst ATTRIBUTE_UNUSED)
639 /* op1:CRn:CRm:op2 */
640 insert_fields (code, info->sysins_op->value, inst->opcode->mask, 4,
641 FLD_op2, FLD_CRm, FLD_CRn, FLD_op1);
645 /* Encode the memory barrier option operand for e.g. DMB <option>|#<imm>. */
648 aarch64_ins_barrier (const aarch64_operand *self ATTRIBUTE_UNUSED,
649 const aarch64_opnd_info *info, aarch64_insn *code,
650 const aarch64_inst *inst ATTRIBUTE_UNUSED)
653 insert_field (FLD_CRm, code, info->barrier->value, 0);
657 /* Encode the prefetch operation option operand for e.g.
658 PRFM <prfop>, [<Xn|SP>{, #<pimm>}]. */
661 aarch64_ins_prfop (const aarch64_operand *self ATTRIBUTE_UNUSED,
662 const aarch64_opnd_info *info, aarch64_insn *code,
663 const aarch64_inst *inst ATTRIBUTE_UNUSED)
666 insert_field (FLD_Rt, code, info->prfop->value, 0);
670 /* Encode the hint number for instructions that alias HINT but take an
674 aarch64_ins_hint (const aarch64_operand *self ATTRIBUTE_UNUSED,
675 const aarch64_opnd_info *info, aarch64_insn *code,
676 const aarch64_inst *inst ATTRIBUTE_UNUSED)
679 insert_fields (code, info->hint_option->value, 0, 2, FLD_op2, FLD_CRm);
683 /* Encode the extended register operand for e.g.
684 STR <Qt>, [<Xn|SP>, <R><m>{, <extend> {<amount>}}]. */
686 aarch64_ins_reg_extended (const aarch64_operand *self ATTRIBUTE_UNUSED,
687 const aarch64_opnd_info *info, aarch64_insn *code,
688 const aarch64_inst *inst ATTRIBUTE_UNUSED)
690 enum aarch64_modifier_kind kind;
693 insert_field (FLD_Rm, code, info->reg.regno, 0);
695 kind = info->shifter.kind;
696 if (kind == AARCH64_MOD_LSL)
697 kind = info->qualifier == AARCH64_OPND_QLF_W
698 ? AARCH64_MOD_UXTW : AARCH64_MOD_UXTX;
699 insert_field (FLD_option, code, aarch64_get_operand_modifier_value (kind), 0);
701 insert_field (FLD_imm3, code, info->shifter.amount, 0);
706 /* Encode the shifted register operand for e.g.
707 SUBS <Xd>, <Xn>, <Xm> {, <shift> #<amount>}. */
709 aarch64_ins_reg_shifted (const aarch64_operand *self ATTRIBUTE_UNUSED,
710 const aarch64_opnd_info *info, aarch64_insn *code,
711 const aarch64_inst *inst ATTRIBUTE_UNUSED)
714 insert_field (FLD_Rm, code, info->reg.regno, 0);
716 insert_field (FLD_shift, code,
717 aarch64_get_operand_modifier_value (info->shifter.kind), 0);
719 insert_field (FLD_imm6, code, info->shifter.amount, 0);
724 /* Miscellaneous encoding functions. */
726 /* Encode size[0], i.e. bit 22, for
727 e.g. FCVTN<Q> <Vd>.<Tb>, <Vn>.<Ta>. */
730 encode_asimd_fcvt (aarch64_inst *inst)
733 aarch64_field field = {0, 0};
734 enum aarch64_opnd_qualifier qualifier;
736 switch (inst->opcode->op)
740 /* FCVTN<Q> <Vd>.<Tb>, <Vn>.<Ta>. */
741 qualifier = inst->operands[1].qualifier;
745 /* FCVTL<Q> <Vd>.<Ta>, <Vn>.<Tb>. */
746 qualifier = inst->operands[0].qualifier;
751 assert (qualifier == AARCH64_OPND_QLF_V_4S
752 || qualifier == AARCH64_OPND_QLF_V_2D);
753 value = (qualifier == AARCH64_OPND_QLF_V_4S) ? 0 : 1;
754 gen_sub_field (FLD_size, 0, 1, &field);
755 insert_field_2 (&field, &inst->value, value, 0);
758 /* Encode size[0], i.e. bit 22, for
759 e.g. FCVTXN <Vb><d>, <Va><n>. */
762 encode_asisd_fcvtxn (aarch64_inst *inst)
764 aarch64_insn val = 1;
765 aarch64_field field = {0, 0};
766 assert (inst->operands[0].qualifier == AARCH64_OPND_QLF_S_S);
767 gen_sub_field (FLD_size, 0, 1, &field);
768 insert_field_2 (&field, &inst->value, val, 0);
771 /* Encode the 'opc' field for e.g. FCVT <Dd>, <Sn>. */
773 encode_fcvt (aarch64_inst *inst)
776 const aarch64_field field = {15, 2};
779 switch (inst->operands[0].qualifier)
781 case AARCH64_OPND_QLF_S_S: val = 0; break;
782 case AARCH64_OPND_QLF_S_D: val = 1; break;
783 case AARCH64_OPND_QLF_S_H: val = 3; break;
786 insert_field_2 (&field, &inst->value, val, 0);
791 /* Do miscellaneous encodings that are not common enough to be driven by
795 do_misc_encoding (aarch64_inst *inst)
797 switch (inst->opcode->op)
806 encode_asimd_fcvt (inst);
809 encode_asisd_fcvtxn (inst);
815 /* Encode the 'size' and 'Q' field for e.g. SHADD. */
817 encode_sizeq (aarch64_inst *inst)
820 enum aarch64_field_kind kind;
823 /* Get the index of the operand whose information we are going to use
824 to encode the size and Q fields.
825 This is deduced from the possible valid qualifier lists. */
826 idx = aarch64_select_operand_for_sizeq_field_coding (inst->opcode);
827 DEBUG_TRACE ("idx: %d; qualifier: %s", idx,
828 aarch64_get_qualifier_name (inst->operands[idx].qualifier));
829 sizeq = aarch64_get_qualifier_standard_value (inst->operands[idx].qualifier);
831 insert_field (FLD_Q, &inst->value, sizeq & 0x1, inst->opcode->mask);
833 if (inst->opcode->iclass == asisdlse
834 || inst->opcode->iclass == asisdlsep
835 || inst->opcode->iclass == asisdlso
836 || inst->opcode->iclass == asisdlsop)
837 kind = FLD_vldst_size;
840 insert_field (kind, &inst->value, (sizeq >> 1) & 0x3, inst->opcode->mask);
843 /* Opcodes that have fields shared by multiple operands are usually flagged
844 with flags. In this function, we detect such flags and use the
845 information in one of the related operands to do the encoding. The 'one'
846 operand is not any operand but one of the operands that has the enough
847 information for such an encoding. */
850 do_special_encoding (struct aarch64_inst *inst)
853 aarch64_insn value = 0;
855 DEBUG_TRACE ("enter with coding 0x%x", (uint32_t) inst->value);
857 /* Condition for truly conditional executed instructions, e.g. b.cond. */
858 if (inst->opcode->flags & F_COND)
860 insert_field (FLD_cond2, &inst->value, inst->cond->value, 0);
862 if (inst->opcode->flags & F_SF)
864 idx = select_operand_for_sf_field_coding (inst->opcode);
865 value = (inst->operands[idx].qualifier == AARCH64_OPND_QLF_X
866 || inst->operands[idx].qualifier == AARCH64_OPND_QLF_SP)
868 insert_field (FLD_sf, &inst->value, value, 0);
869 if (inst->opcode->flags & F_N)
870 insert_field (FLD_N, &inst->value, value, inst->opcode->mask);
872 if (inst->opcode->flags & F_LSE_SZ)
874 idx = select_operand_for_sf_field_coding (inst->opcode);
875 value = (inst->operands[idx].qualifier == AARCH64_OPND_QLF_X
876 || inst->operands[idx].qualifier == AARCH64_OPND_QLF_SP)
878 insert_field (FLD_lse_sz, &inst->value, value, 0);
880 if (inst->opcode->flags & F_SIZEQ)
882 if (inst->opcode->flags & F_FPTYPE)
884 idx = select_operand_for_fptype_field_coding (inst->opcode);
885 switch (inst->operands[idx].qualifier)
887 case AARCH64_OPND_QLF_S_S: value = 0; break;
888 case AARCH64_OPND_QLF_S_D: value = 1; break;
889 case AARCH64_OPND_QLF_S_H: value = 3; break;
892 insert_field (FLD_type, &inst->value, value, 0);
894 if (inst->opcode->flags & F_SSIZE)
896 enum aarch64_opnd_qualifier qualifier;
897 idx = select_operand_for_scalar_size_field_coding (inst->opcode);
898 qualifier = inst->operands[idx].qualifier;
899 assert (qualifier >= AARCH64_OPND_QLF_S_B
900 && qualifier <= AARCH64_OPND_QLF_S_Q);
901 value = aarch64_get_qualifier_standard_value (qualifier);
902 insert_field (FLD_size, &inst->value, value, inst->opcode->mask);
904 if (inst->opcode->flags & F_T)
906 int num; /* num of consecutive '0's on the right side of imm5<3:0>. */
907 aarch64_field field = {0, 0};
908 enum aarch64_opnd_qualifier qualifier;
911 qualifier = inst->operands[idx].qualifier;
912 assert (aarch64_get_operand_class (inst->opcode->operands[0])
913 == AARCH64_OPND_CLASS_SIMD_REG
914 && qualifier >= AARCH64_OPND_QLF_V_8B
915 && qualifier <= AARCH64_OPND_QLF_V_2D);
926 value = aarch64_get_qualifier_standard_value (qualifier);
927 insert_field (FLD_Q, &inst->value, value & 0x1, inst->opcode->mask);
928 num = (int) value >> 1;
929 assert (num >= 0 && num <= 3);
930 gen_sub_field (FLD_imm5, 0, num + 1, &field);
931 insert_field_2 (&field, &inst->value, 1 << num, inst->opcode->mask);
933 if (inst->opcode->flags & F_GPRSIZE_IN_Q)
935 /* Use Rt to encode in the case of e.g.
936 STXP <Ws>, <Xt1>, <Xt2>, [<Xn|SP>{,#0}]. */
937 enum aarch64_opnd_qualifier qualifier;
938 idx = aarch64_operand_index (inst->opcode->operands, AARCH64_OPND_Rt);
940 /* Otherwise use the result operand, which has to be a integer
943 assert (idx == 0 || idx == 1);
944 assert (aarch64_get_operand_class (inst->opcode->operands[idx])
945 == AARCH64_OPND_CLASS_INT_REG);
946 qualifier = inst->operands[idx].qualifier;
947 insert_field (FLD_Q, &inst->value,
948 aarch64_get_qualifier_standard_value (qualifier), 0);
950 if (inst->opcode->flags & F_LDS_SIZE)
952 /* e.g. LDRSB <Wt>, [<Xn|SP>, <R><m>{, <extend> {<amount>}}]. */
953 enum aarch64_opnd_qualifier qualifier;
954 aarch64_field field = {0, 0};
955 assert (aarch64_get_operand_class (inst->opcode->operands[0])
956 == AARCH64_OPND_CLASS_INT_REG);
957 gen_sub_field (FLD_opc, 0, 1, &field);
958 qualifier = inst->operands[0].qualifier;
959 insert_field_2 (&field, &inst->value,
960 1 - aarch64_get_qualifier_standard_value (qualifier), 0);
962 /* Miscellaneous encoding as the last step. */
963 if (inst->opcode->flags & F_MISC)
964 do_misc_encoding (inst);
966 DEBUG_TRACE ("exit with coding 0x%x", (uint32_t) inst->value);
969 /* Converters converting an alias opcode instruction to its real form. */
971 /* ROR <Wd>, <Ws>, #<shift>
973 EXTR <Wd>, <Ws>, <Ws>, #<shift>. */
975 convert_ror_to_extr (aarch64_inst *inst)
977 copy_operand_info (inst, 3, 2);
978 copy_operand_info (inst, 2, 1);
981 /* UXTL<Q> <Vd>.<Ta>, <Vn>.<Tb>
983 USHLL<Q> <Vd>.<Ta>, <Vn>.<Tb>, #0. */
985 convert_xtl_to_shll (aarch64_inst *inst)
987 inst->operands[2].qualifier = inst->operands[1].qualifier;
988 inst->operands[2].imm.value = 0;
992 LSR <Xd>, <Xn>, #<shift>
994 UBFM <Xd>, <Xn>, #<shift>, #63. */
996 convert_sr_to_bfm (aarch64_inst *inst)
998 inst->operands[3].imm.value =
999 inst->operands[2].qualifier == AARCH64_OPND_QLF_imm_0_31 ? 31 : 63;
1002 /* Convert MOV to ORR. */
1004 convert_mov_to_orr (aarch64_inst *inst)
1006 /* MOV <Vd>.<T>, <Vn>.<T>
1008 ORR <Vd>.<T>, <Vn>.<T>, <Vn>.<T>. */
1009 copy_operand_info (inst, 2, 1);
1012 /* When <imms> >= <immr>, the instruction written:
1013 SBFX <Xd>, <Xn>, #<lsb>, #<width>
1015 SBFM <Xd>, <Xn>, #<lsb>, #(<lsb>+<width>-1). */
1018 convert_bfx_to_bfm (aarch64_inst *inst)
1022 /* Convert the operand. */
1023 lsb = inst->operands[2].imm.value;
1024 width = inst->operands[3].imm.value;
1025 inst->operands[2].imm.value = lsb;
1026 inst->operands[3].imm.value = lsb + width - 1;
1029 /* When <imms> < <immr>, the instruction written:
1030 SBFIZ <Xd>, <Xn>, #<lsb>, #<width>
1032 SBFM <Xd>, <Xn>, #((64-<lsb>)&0x3f), #(<width>-1). */
1035 convert_bfi_to_bfm (aarch64_inst *inst)
1039 /* Convert the operand. */
1040 lsb = inst->operands[2].imm.value;
1041 width = inst->operands[3].imm.value;
1042 if (inst->operands[2].qualifier == AARCH64_OPND_QLF_imm_0_31)
1044 inst->operands[2].imm.value = (32 - lsb) & 0x1f;
1045 inst->operands[3].imm.value = width - 1;
1049 inst->operands[2].imm.value = (64 - lsb) & 0x3f;
1050 inst->operands[3].imm.value = width - 1;
1054 /* The instruction written:
1055 BFC <Xd>, #<lsb>, #<width>
1057 BFM <Xd>, XZR, #((64-<lsb>)&0x3f), #(<width>-1). */
1060 convert_bfc_to_bfm (aarch64_inst *inst)
1065 copy_operand_info (inst, 3, 2);
1066 copy_operand_info (inst, 2, 1);
1067 copy_operand_info (inst, 2, 0);
1068 inst->operands[1].reg.regno = 0x1f;
1070 /* Convert the immedate operand. */
1071 lsb = inst->operands[2].imm.value;
1072 width = inst->operands[3].imm.value;
1073 if (inst->operands[2].qualifier == AARCH64_OPND_QLF_imm_0_31)
1075 inst->operands[2].imm.value = (32 - lsb) & 0x1f;
1076 inst->operands[3].imm.value = width - 1;
1080 inst->operands[2].imm.value = (64 - lsb) & 0x3f;
1081 inst->operands[3].imm.value = width - 1;
1085 /* The instruction written:
1086 LSL <Xd>, <Xn>, #<shift>
1088 UBFM <Xd>, <Xn>, #((64-<shift>)&0x3f), #(63-<shift>). */
1091 convert_lsl_to_ubfm (aarch64_inst *inst)
1093 int64_t shift = inst->operands[2].imm.value;
1095 if (inst->operands[2].qualifier == AARCH64_OPND_QLF_imm_0_31)
1097 inst->operands[2].imm.value = (32 - shift) & 0x1f;
1098 inst->operands[3].imm.value = 31 - shift;
1102 inst->operands[2].imm.value = (64 - shift) & 0x3f;
1103 inst->operands[3].imm.value = 63 - shift;
1107 /* CINC <Wd>, <Wn>, <cond>
1109 CSINC <Wd>, <Wn>, <Wn>, invert(<cond>). */
1112 convert_to_csel (aarch64_inst *inst)
1114 copy_operand_info (inst, 3, 2);
1115 copy_operand_info (inst, 2, 1);
1116 inst->operands[3].cond = get_inverted_cond (inst->operands[3].cond);
1119 /* CSET <Wd>, <cond>
1121 CSINC <Wd>, WZR, WZR, invert(<cond>). */
1124 convert_cset_to_csinc (aarch64_inst *inst)
1126 copy_operand_info (inst, 3, 1);
1127 copy_operand_info (inst, 2, 0);
1128 copy_operand_info (inst, 1, 0);
1129 inst->operands[1].reg.regno = 0x1f;
1130 inst->operands[2].reg.regno = 0x1f;
1131 inst->operands[3].cond = get_inverted_cond (inst->operands[3].cond);
1136 MOVZ <Wd>, #<imm16>, LSL #<shift>. */
1139 convert_mov_to_movewide (aarch64_inst *inst)
1142 uint32_t shift_amount;
1145 switch (inst->opcode->op)
1147 case OP_MOV_IMM_WIDE:
1148 value = inst->operands[1].imm.value;
1150 case OP_MOV_IMM_WIDEN:
1151 value = ~inst->operands[1].imm.value;
1156 inst->operands[1].type = AARCH64_OPND_HALF;
1157 is32 = inst->operands[0].qualifier == AARCH64_OPND_QLF_W;
1158 if (! aarch64_wide_constant_p (value, is32, &shift_amount))
1159 /* The constraint check should have guaranteed this wouldn't happen. */
1161 value >>= shift_amount;
1163 inst->operands[1].imm.value = value;
1164 inst->operands[1].shifter.kind = AARCH64_MOD_LSL;
1165 inst->operands[1].shifter.amount = shift_amount;
1170 ORR <Wd>, WZR, #<imm>. */
1173 convert_mov_to_movebitmask (aarch64_inst *inst)
1175 copy_operand_info (inst, 2, 1);
1176 inst->operands[1].reg.regno = 0x1f;
1177 inst->operands[1].skip = 0;
1180 /* Some alias opcodes are assembled by being converted to their real-form. */
1183 convert_to_real (aarch64_inst *inst, const aarch64_opcode *real)
1185 const aarch64_opcode *alias = inst->opcode;
1187 if ((alias->flags & F_CONV) == 0)
1188 goto convert_to_real_return;
1194 convert_sr_to_bfm (inst);
1197 convert_lsl_to_ubfm (inst);
1202 convert_to_csel (inst);
1206 convert_cset_to_csinc (inst);
1211 convert_bfx_to_bfm (inst);
1216 convert_bfi_to_bfm (inst);
1219 convert_bfc_to_bfm (inst);
1222 convert_mov_to_orr (inst);
1224 case OP_MOV_IMM_WIDE:
1225 case OP_MOV_IMM_WIDEN:
1226 convert_mov_to_movewide (inst);
1228 case OP_MOV_IMM_LOG:
1229 convert_mov_to_movebitmask (inst);
1232 convert_ror_to_extr (inst);
1238 convert_xtl_to_shll (inst);
1244 convert_to_real_return:
1245 aarch64_replace_opcode (inst, real);
1248 /* Encode *INST_ORI of the opcode code OPCODE.
1249 Return the encoded result in *CODE and if QLF_SEQ is not NULL, return the
1250 matched operand qualifier sequence in *QLF_SEQ. */
1253 aarch64_opcode_encode (const aarch64_opcode *opcode,
1254 const aarch64_inst *inst_ori, aarch64_insn *code,
1255 aarch64_opnd_qualifier_t *qlf_seq,
1256 aarch64_operand_error *mismatch_detail)
1259 const aarch64_opcode *aliased;
1260 aarch64_inst copy, *inst;
1262 DEBUG_TRACE ("enter with %s", opcode->name);
1264 /* Create a copy of *INST_ORI, so that we can do any change we want. */
1268 assert (inst->opcode == NULL || inst->opcode == opcode);
1269 if (inst->opcode == NULL)
1270 inst->opcode = opcode;
1272 /* Constrain the operands.
1273 After passing this, the encoding is guaranteed to succeed. */
1274 if (aarch64_match_operands_constraint (inst, mismatch_detail) == 0)
1276 DEBUG_TRACE ("FAIL since operand constraint not met");
1280 /* Get the base value.
1281 Note: this has to be before the aliasing handling below in order to
1282 get the base value from the alias opcode before we move on to the
1283 aliased opcode for encoding. */
1284 inst->value = opcode->opcode;
1286 /* No need to do anything else if the opcode does not have any operand. */
1287 if (aarch64_num_of_operands (opcode) == 0)
1290 /* Assign operand indexes and check types. Also put the matched
1291 operand qualifiers in *QLF_SEQ to return. */
1292 for (i = 0; i < AARCH64_MAX_OPND_NUM; ++i)
1294 assert (opcode->operands[i] == inst->operands[i].type);
1295 inst->operands[i].idx = i;
1296 if (qlf_seq != NULL)
1297 *qlf_seq = inst->operands[i].qualifier;
1300 aliased = aarch64_find_real_opcode (opcode);
1301 /* If the opcode is an alias and it does not ask for direct encoding by
1302 itself, the instruction will be transformed to the form of real opcode
1303 and the encoding will be carried out using the rules for the aliased
1305 if (aliased != NULL && (opcode->flags & F_CONV))
1307 DEBUG_TRACE ("real opcode '%s' has been found for the alias %s",
1308 aliased->name, opcode->name);
1309 /* Convert the operands to the form of the real opcode. */
1310 convert_to_real (inst, aliased);
1314 aarch64_opnd_info *info = inst->operands;
1316 /* Call the inserter of each operand. */
1317 for (i = 0; i < AARCH64_MAX_OPND_NUM; ++i, ++info)
1319 const aarch64_operand *opnd;
1320 enum aarch64_opnd type = opcode->operands[i];
1321 if (type == AARCH64_OPND_NIL)
1325 DEBUG_TRACE ("skip the incomplete operand %d", i);
1328 opnd = &aarch64_operands[type];
1329 if (operand_has_inserter (opnd))
1330 aarch64_insert_operand (opnd, info, &inst->value, inst);
1333 /* Call opcode encoders indicated by flags. */
1334 if (opcode_has_special_coder (opcode))
1335 do_special_encoding (inst);
1338 DEBUG_TRACE ("exit with %s", opcode->name);
1340 *code = inst->value;