1 /* 2 * ARM translation: M-profile MVE instructions 3 * 4 * Copyright (c) 2021 Linaro, Ltd. 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include "qemu/osdep.h" 21 #include "tcg/tcg-op.h" 22 #include "tcg/tcg-op-gvec.h" 23 #include "exec/exec-all.h" 24 #include "exec/gen-icount.h" 25 #include "translate.h" 26 #include "translate-a32.h" 27 28 /* Include the generated decoder */ 29 #include "decode-mve.c.inc" 30 31 typedef void MVEGenLdStFn(TCGv_ptr, TCGv_ptr, TCGv_i32); 32 typedef void MVEGenOneOpFn(TCGv_ptr, TCGv_ptr, TCGv_ptr); 33 typedef void MVEGenTwoOpFn(TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_ptr); 34 typedef void MVEGenTwoOpScalarFn(TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_i32); 35 typedef void MVEGenDualAccOpFn(TCGv_i64, TCGv_ptr, TCGv_ptr, TCGv_ptr, TCGv_i64); 36 37 /* Return the offset of a Qn register (same semantics as aa32_vfp_qreg()) */ 38 static inline long mve_qreg_offset(unsigned reg) 39 { 40 return offsetof(CPUARMState, vfp.zregs[reg].d[0]); 41 } 42 43 static TCGv_ptr mve_qreg_ptr(unsigned reg) 44 { 45 TCGv_ptr ret = tcg_temp_new_ptr(); 46 tcg_gen_addi_ptr(ret, cpu_env, mve_qreg_offset(reg)); 47 return ret; 48 } 49 50 static bool mve_check_qreg_bank(DisasContext *s, int qmask) 51 { 52 /* 53 * Check whether Qregs are in range. For v8.1M only Q0..Q7 54 * are supported, see VFPSmallRegisterBank(). 55 */ 56 return qmask < 8; 57 } 58 59 static bool mve_eci_check(DisasContext *s) 60 { 61 /* 62 * This is a beatwise insn: check that ECI is valid (not a 63 * reserved value) and note that we are handling it. 64 * Return true if OK, false if we generated an exception. 65 */ 66 s->eci_handled = true; 67 switch (s->eci) { 68 case ECI_NONE: 69 case ECI_A0: 70 case ECI_A0A1: 71 case ECI_A0A1A2: 72 case ECI_A0A1A2B0: 73 return true; 74 default: 75 /* Reserved value: INVSTATE UsageFault */ 76 gen_exception_insn(s, s->pc_curr, EXCP_INVSTATE, syn_uncategorized(), 77 default_exception_el(s)); 78 return false; 79 } 80 } 81 82 static void mve_update_eci(DisasContext *s) 83 { 84 /* 85 * The helper function will always update the CPUState field, 86 * so we only need to update the DisasContext field. 87 */ 88 if (s->eci) { 89 s->eci = (s->eci == ECI_A0A1A2B0) ? ECI_A0 : ECI_NONE; 90 } 91 } 92 93 static void mve_update_and_store_eci(DisasContext *s) 94 { 95 /* 96 * For insns which don't call a helper function that will call 97 * mve_advance_vpt(), this version updates s->eci and also stores 98 * it out to the CPUState field. 99 */ 100 if (s->eci) { 101 mve_update_eci(s); 102 store_cpu_field(tcg_constant_i32(s->eci << 4), condexec_bits); 103 } 104 } 105 106 static bool mve_skip_first_beat(DisasContext *s) 107 { 108 /* Return true if PSR.ECI says we must skip the first beat of this insn */ 109 switch (s->eci) { 110 case ECI_NONE: 111 return false; 112 case ECI_A0: 113 case ECI_A0A1: 114 case ECI_A0A1A2: 115 case ECI_A0A1A2B0: 116 return true; 117 default: 118 g_assert_not_reached(); 119 } 120 } 121 122 static bool do_ldst(DisasContext *s, arg_VLDR_VSTR *a, MVEGenLdStFn *fn) 123 { 124 TCGv_i32 addr; 125 uint32_t offset; 126 TCGv_ptr qreg; 127 128 if (!dc_isar_feature(aa32_mve, s) || 129 !mve_check_qreg_bank(s, a->qd) || 130 !fn) { 131 return false; 132 } 133 134 /* CONSTRAINED UNPREDICTABLE: we choose to UNDEF */ 135 if (a->rn == 15 || (a->rn == 13 && a->w)) { 136 return false; 137 } 138 139 if (!mve_eci_check(s) || !vfp_access_check(s)) { 140 return true; 141 } 142 143 offset = a->imm << a->size; 144 if (!a->a) { 145 offset = -offset; 146 } 147 addr = load_reg(s, a->rn); 148 if (a->p) { 149 tcg_gen_addi_i32(addr, addr, offset); 150 } 151 152 qreg = mve_qreg_ptr(a->qd); 153 fn(cpu_env, qreg, addr); 154 tcg_temp_free_ptr(qreg); 155 156 /* 157 * Writeback always happens after the last beat of the insn, 158 * regardless of predication 159 */ 160 if (a->w) { 161 if (!a->p) { 162 tcg_gen_addi_i32(addr, addr, offset); 163 } 164 store_reg(s, a->rn, addr); 165 } else { 166 tcg_temp_free_i32(addr); 167 } 168 mve_update_eci(s); 169 return true; 170 } 171 172 static bool trans_VLDR_VSTR(DisasContext *s, arg_VLDR_VSTR *a) 173 { 174 static MVEGenLdStFn * const ldstfns[4][2] = { 175 { gen_helper_mve_vstrb, gen_helper_mve_vldrb }, 176 { gen_helper_mve_vstrh, gen_helper_mve_vldrh }, 177 { gen_helper_mve_vstrw, gen_helper_mve_vldrw }, 178 { NULL, NULL } 179 }; 180 return do_ldst(s, a, ldstfns[a->size][a->l]); 181 } 182 183 #define DO_VLDST_WIDE_NARROW(OP, SLD, ULD, ST) \ 184 static bool trans_##OP(DisasContext *s, arg_VLDR_VSTR *a) \ 185 { \ 186 static MVEGenLdStFn * const ldstfns[2][2] = { \ 187 { gen_helper_mve_##ST, gen_helper_mve_##SLD }, \ 188 { NULL, gen_helper_mve_##ULD }, \ 189 }; \ 190 return do_ldst(s, a, ldstfns[a->u][a->l]); \ 191 } 192 193 DO_VLDST_WIDE_NARROW(VLDSTB_H, vldrb_sh, vldrb_uh, vstrb_h) 194 DO_VLDST_WIDE_NARROW(VLDSTB_W, vldrb_sw, vldrb_uw, vstrb_w) 195 DO_VLDST_WIDE_NARROW(VLDSTH_W, vldrh_sw, vldrh_uw, vstrh_w) 196 197 static bool trans_VDUP(DisasContext *s, arg_VDUP *a) 198 { 199 TCGv_ptr qd; 200 TCGv_i32 rt; 201 202 if (!dc_isar_feature(aa32_mve, s) || 203 !mve_check_qreg_bank(s, a->qd)) { 204 return false; 205 } 206 if (a->rt == 13 || a->rt == 15) { 207 /* UNPREDICTABLE; we choose to UNDEF */ 208 return false; 209 } 210 if (!mve_eci_check(s) || !vfp_access_check(s)) { 211 return true; 212 } 213 214 qd = mve_qreg_ptr(a->qd); 215 rt = load_reg(s, a->rt); 216 tcg_gen_dup_i32(a->size, rt, rt); 217 gen_helper_mve_vdup(cpu_env, qd, rt); 218 tcg_temp_free_ptr(qd); 219 tcg_temp_free_i32(rt); 220 mve_update_eci(s); 221 return true; 222 } 223 224 static bool do_1op(DisasContext *s, arg_1op *a, MVEGenOneOpFn fn) 225 { 226 TCGv_ptr qd, qm; 227 228 if (!dc_isar_feature(aa32_mve, s) || 229 !mve_check_qreg_bank(s, a->qd | a->qm) || 230 !fn) { 231 return false; 232 } 233 234 if (!mve_eci_check(s) || !vfp_access_check(s)) { 235 return true; 236 } 237 238 qd = mve_qreg_ptr(a->qd); 239 qm = mve_qreg_ptr(a->qm); 240 fn(cpu_env, qd, qm); 241 tcg_temp_free_ptr(qd); 242 tcg_temp_free_ptr(qm); 243 mve_update_eci(s); 244 return true; 245 } 246 247 #define DO_1OP(INSN, FN) \ 248 static bool trans_##INSN(DisasContext *s, arg_1op *a) \ 249 { \ 250 static MVEGenOneOpFn * const fns[] = { \ 251 gen_helper_mve_##FN##b, \ 252 gen_helper_mve_##FN##h, \ 253 gen_helper_mve_##FN##w, \ 254 NULL, \ 255 }; \ 256 return do_1op(s, a, fns[a->size]); \ 257 } 258 259 DO_1OP(VCLZ, vclz) 260 DO_1OP(VCLS, vcls) 261 DO_1OP(VABS, vabs) 262 DO_1OP(VNEG, vneg) 263 264 static bool trans_VREV16(DisasContext *s, arg_1op *a) 265 { 266 static MVEGenOneOpFn * const fns[] = { 267 gen_helper_mve_vrev16b, 268 NULL, 269 NULL, 270 NULL, 271 }; 272 return do_1op(s, a, fns[a->size]); 273 } 274 275 static bool trans_VREV32(DisasContext *s, arg_1op *a) 276 { 277 static MVEGenOneOpFn * const fns[] = { 278 gen_helper_mve_vrev32b, 279 gen_helper_mve_vrev32h, 280 NULL, 281 NULL, 282 }; 283 return do_1op(s, a, fns[a->size]); 284 } 285 286 static bool trans_VREV64(DisasContext *s, arg_1op *a) 287 { 288 static MVEGenOneOpFn * const fns[] = { 289 gen_helper_mve_vrev64b, 290 gen_helper_mve_vrev64h, 291 gen_helper_mve_vrev64w, 292 NULL, 293 }; 294 return do_1op(s, a, fns[a->size]); 295 } 296 297 static bool trans_VMVN(DisasContext *s, arg_1op *a) 298 { 299 return do_1op(s, a, gen_helper_mve_vmvn); 300 } 301 302 static bool trans_VABS_fp(DisasContext *s, arg_1op *a) 303 { 304 static MVEGenOneOpFn * const fns[] = { 305 NULL, 306 gen_helper_mve_vfabsh, 307 gen_helper_mve_vfabss, 308 NULL, 309 }; 310 if (!dc_isar_feature(aa32_mve_fp, s)) { 311 return false; 312 } 313 return do_1op(s, a, fns[a->size]); 314 } 315 316 static bool trans_VNEG_fp(DisasContext *s, arg_1op *a) 317 { 318 static MVEGenOneOpFn * const fns[] = { 319 NULL, 320 gen_helper_mve_vfnegh, 321 gen_helper_mve_vfnegs, 322 NULL, 323 }; 324 if (!dc_isar_feature(aa32_mve_fp, s)) { 325 return false; 326 } 327 return do_1op(s, a, fns[a->size]); 328 } 329 330 static bool do_2op(DisasContext *s, arg_2op *a, MVEGenTwoOpFn fn) 331 { 332 TCGv_ptr qd, qn, qm; 333 334 if (!dc_isar_feature(aa32_mve, s) || 335 !mve_check_qreg_bank(s, a->qd | a->qn | a->qm) || 336 !fn) { 337 return false; 338 } 339 if (!mve_eci_check(s) || !vfp_access_check(s)) { 340 return true; 341 } 342 343 qd = mve_qreg_ptr(a->qd); 344 qn = mve_qreg_ptr(a->qn); 345 qm = mve_qreg_ptr(a->qm); 346 fn(cpu_env, qd, qn, qm); 347 tcg_temp_free_ptr(qd); 348 tcg_temp_free_ptr(qn); 349 tcg_temp_free_ptr(qm); 350 mve_update_eci(s); 351 return true; 352 } 353 354 #define DO_LOGIC(INSN, HELPER) \ 355 static bool trans_##INSN(DisasContext *s, arg_2op *a) \ 356 { \ 357 return do_2op(s, a, HELPER); \ 358 } 359 360 DO_LOGIC(VAND, gen_helper_mve_vand) 361 DO_LOGIC(VBIC, gen_helper_mve_vbic) 362 DO_LOGIC(VORR, gen_helper_mve_vorr) 363 DO_LOGIC(VORN, gen_helper_mve_vorn) 364 DO_LOGIC(VEOR, gen_helper_mve_veor) 365 366 #define DO_2OP(INSN, FN) \ 367 static bool trans_##INSN(DisasContext *s, arg_2op *a) \ 368 { \ 369 static MVEGenTwoOpFn * const fns[] = { \ 370 gen_helper_mve_##FN##b, \ 371 gen_helper_mve_##FN##h, \ 372 gen_helper_mve_##FN##w, \ 373 NULL, \ 374 }; \ 375 return do_2op(s, a, fns[a->size]); \ 376 } 377 378 DO_2OP(VADD, vadd) 379 DO_2OP(VSUB, vsub) 380 DO_2OP(VMUL, vmul) 381 DO_2OP(VMULH_S, vmulhs) 382 DO_2OP(VMULH_U, vmulhu) 383 DO_2OP(VRMULH_S, vrmulhs) 384 DO_2OP(VRMULH_U, vrmulhu) 385 DO_2OP(VMAX_S, vmaxs) 386 DO_2OP(VMAX_U, vmaxu) 387 DO_2OP(VMIN_S, vmins) 388 DO_2OP(VMIN_U, vminu) 389 DO_2OP(VABD_S, vabds) 390 DO_2OP(VABD_U, vabdu) 391 DO_2OP(VHADD_S, vhadds) 392 DO_2OP(VHADD_U, vhaddu) 393 DO_2OP(VHSUB_S, vhsubs) 394 DO_2OP(VHSUB_U, vhsubu) 395 DO_2OP(VMULL_BS, vmullbs) 396 DO_2OP(VMULL_BU, vmullbu) 397 DO_2OP(VMULL_TS, vmullts) 398 DO_2OP(VMULL_TU, vmulltu) 399 400 static bool do_2op_scalar(DisasContext *s, arg_2scalar *a, 401 MVEGenTwoOpScalarFn fn) 402 { 403 TCGv_ptr qd, qn; 404 TCGv_i32 rm; 405 406 if (!dc_isar_feature(aa32_mve, s) || 407 !mve_check_qreg_bank(s, a->qd | a->qn) || 408 !fn) { 409 return false; 410 } 411 if (a->rm == 13 || a->rm == 15) { 412 /* UNPREDICTABLE */ 413 return false; 414 } 415 if (!mve_eci_check(s) || !vfp_access_check(s)) { 416 return true; 417 } 418 419 qd = mve_qreg_ptr(a->qd); 420 qn = mve_qreg_ptr(a->qn); 421 rm = load_reg(s, a->rm); 422 fn(cpu_env, qd, qn, rm); 423 tcg_temp_free_i32(rm); 424 tcg_temp_free_ptr(qd); 425 tcg_temp_free_ptr(qn); 426 mve_update_eci(s); 427 return true; 428 } 429 430 #define DO_2OP_SCALAR(INSN, FN) \ 431 static bool trans_##INSN(DisasContext *s, arg_2scalar *a) \ 432 { \ 433 static MVEGenTwoOpScalarFn * const fns[] = { \ 434 gen_helper_mve_##FN##b, \ 435 gen_helper_mve_##FN##h, \ 436 gen_helper_mve_##FN##w, \ 437 NULL, \ 438 }; \ 439 return do_2op_scalar(s, a, fns[a->size]); \ 440 } 441 442 DO_2OP_SCALAR(VADD_scalar, vadd_scalar) 443 DO_2OP_SCALAR(VSUB_scalar, vsub_scalar) 444 DO_2OP_SCALAR(VMUL_scalar, vmul_scalar) 445 DO_2OP_SCALAR(VHADD_S_scalar, vhadds_scalar) 446 DO_2OP_SCALAR(VHADD_U_scalar, vhaddu_scalar) 447 DO_2OP_SCALAR(VHSUB_S_scalar, vhsubs_scalar) 448 DO_2OP_SCALAR(VHSUB_U_scalar, vhsubu_scalar) 449 DO_2OP_SCALAR(VQADD_S_scalar, vqadds_scalar) 450 DO_2OP_SCALAR(VQADD_U_scalar, vqaddu_scalar) 451 DO_2OP_SCALAR(VQSUB_S_scalar, vqsubs_scalar) 452 DO_2OP_SCALAR(VQSUB_U_scalar, vqsubu_scalar) 453 DO_2OP_SCALAR(VBRSR, vbrsr) 454 455 static bool do_long_dual_acc(DisasContext *s, arg_vmlaldav *a, 456 MVEGenDualAccOpFn *fn) 457 { 458 TCGv_ptr qn, qm; 459 TCGv_i64 rda; 460 TCGv_i32 rdalo, rdahi; 461 462 if (!dc_isar_feature(aa32_mve, s) || 463 !mve_check_qreg_bank(s, a->qn | a->qm) || 464 !fn) { 465 return false; 466 } 467 /* 468 * rdahi == 13 is UNPREDICTABLE; rdahi == 15 is a related 469 * encoding; rdalo always has bit 0 clear so cannot be 13 or 15. 470 */ 471 if (a->rdahi == 13 || a->rdahi == 15) { 472 return false; 473 } 474 if (!mve_eci_check(s) || !vfp_access_check(s)) { 475 return true; 476 } 477 478 qn = mve_qreg_ptr(a->qn); 479 qm = mve_qreg_ptr(a->qm); 480 481 /* 482 * This insn is subject to beat-wise execution. Partial execution 483 * of an A=0 (no-accumulate) insn which does not execute the first 484 * beat must start with the current rda value, not 0. 485 */ 486 if (a->a || mve_skip_first_beat(s)) { 487 rda = tcg_temp_new_i64(); 488 rdalo = load_reg(s, a->rdalo); 489 rdahi = load_reg(s, a->rdahi); 490 tcg_gen_concat_i32_i64(rda, rdalo, rdahi); 491 tcg_temp_free_i32(rdalo); 492 tcg_temp_free_i32(rdahi); 493 } else { 494 rda = tcg_const_i64(0); 495 } 496 497 fn(rda, cpu_env, qn, qm, rda); 498 tcg_temp_free_ptr(qn); 499 tcg_temp_free_ptr(qm); 500 501 rdalo = tcg_temp_new_i32(); 502 rdahi = tcg_temp_new_i32(); 503 tcg_gen_extrl_i64_i32(rdalo, rda); 504 tcg_gen_extrh_i64_i32(rdahi, rda); 505 store_reg(s, a->rdalo, rdalo); 506 store_reg(s, a->rdahi, rdahi); 507 tcg_temp_free_i64(rda); 508 mve_update_eci(s); 509 return true; 510 } 511 512 static bool trans_VMLALDAV_S(DisasContext *s, arg_vmlaldav *a) 513 { 514 static MVEGenDualAccOpFn * const fns[4][2] = { 515 { NULL, NULL }, 516 { gen_helper_mve_vmlaldavsh, gen_helper_mve_vmlaldavxsh }, 517 { gen_helper_mve_vmlaldavsw, gen_helper_mve_vmlaldavxsw }, 518 { NULL, NULL }, 519 }; 520 return do_long_dual_acc(s, a, fns[a->size][a->x]); 521 } 522 523 static bool trans_VMLALDAV_U(DisasContext *s, arg_vmlaldav *a) 524 { 525 static MVEGenDualAccOpFn * const fns[4][2] = { 526 { NULL, NULL }, 527 { gen_helper_mve_vmlaldavuh, NULL }, 528 { gen_helper_mve_vmlaldavuw, NULL }, 529 { NULL, NULL }, 530 }; 531 return do_long_dual_acc(s, a, fns[a->size][a->x]); 532 } 533 534 static bool trans_VMLSLDAV(DisasContext *s, arg_vmlaldav *a) 535 { 536 static MVEGenDualAccOpFn * const fns[4][2] = { 537 { NULL, NULL }, 538 { gen_helper_mve_vmlsldavsh, gen_helper_mve_vmlsldavxsh }, 539 { gen_helper_mve_vmlsldavsw, gen_helper_mve_vmlsldavxsw }, 540 { NULL, NULL }, 541 }; 542 return do_long_dual_acc(s, a, fns[a->size][a->x]); 543 } 544 545 static bool trans_VRMLALDAVH_S(DisasContext *s, arg_vmlaldav *a) 546 { 547 static MVEGenDualAccOpFn * const fns[] = { 548 gen_helper_mve_vrmlaldavhsw, gen_helper_mve_vrmlaldavhxsw, 549 }; 550 return do_long_dual_acc(s, a, fns[a->x]); 551 } 552 553 static bool trans_VRMLALDAVH_U(DisasContext *s, arg_vmlaldav *a) 554 { 555 static MVEGenDualAccOpFn * const fns[] = { 556 gen_helper_mve_vrmlaldavhuw, NULL, 557 }; 558 return do_long_dual_acc(s, a, fns[a->x]); 559 } 560 561 static bool trans_VRMLSLDAVH(DisasContext *s, arg_vmlaldav *a) 562 { 563 static MVEGenDualAccOpFn * const fns[] = { 564 gen_helper_mve_vrmlsldavhsw, gen_helper_mve_vrmlsldavhxsw, 565 }; 566 return do_long_dual_acc(s, a, fns[a->x]); 567 } 568 569 static bool trans_VPST(DisasContext *s, arg_VPST *a) 570 { 571 TCGv_i32 vpr; 572 573 /* mask == 0 is a "related encoding" */ 574 if (!dc_isar_feature(aa32_mve, s) || !a->mask) { 575 return false; 576 } 577 if (!mve_eci_check(s) || !vfp_access_check(s)) { 578 return true; 579 } 580 /* 581 * Set the VPR mask fields. We take advantage of MASK01 and MASK23 582 * being adjacent fields in the register. 583 * 584 * This insn is not predicated, but it is subject to beat-wise 585 * execution, and the mask is updated on the odd-numbered beats. 586 * So if PSR.ECI says we should skip beat 1, we mustn't update the 587 * 01 mask field. 588 */ 589 vpr = load_cpu_field(v7m.vpr); 590 switch (s->eci) { 591 case ECI_NONE: 592 case ECI_A0: 593 /* Update both 01 and 23 fields */ 594 tcg_gen_deposit_i32(vpr, vpr, 595 tcg_constant_i32(a->mask | (a->mask << 4)), 596 R_V7M_VPR_MASK01_SHIFT, 597 R_V7M_VPR_MASK01_LENGTH + R_V7M_VPR_MASK23_LENGTH); 598 break; 599 case ECI_A0A1: 600 case ECI_A0A1A2: 601 case ECI_A0A1A2B0: 602 /* Update only the 23 mask field */ 603 tcg_gen_deposit_i32(vpr, vpr, 604 tcg_constant_i32(a->mask), 605 R_V7M_VPR_MASK23_SHIFT, R_V7M_VPR_MASK23_LENGTH); 606 break; 607 default: 608 g_assert_not_reached(); 609 } 610 store_cpu_field(vpr, v7m.vpr); 611 mve_update_and_store_eci(s); 612 return true; 613 } 614