1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Common functionality for RV32 and RV64 BPF JIT compilers 4 * 5 * Copyright (c) 2019 Björn Töpel <bjorn.topel@gmail.com> 6 * 7 */ 8 9 #ifndef _BPF_JIT_H 10 #define _BPF_JIT_H 11 12 #include <linux/bpf.h> 13 #include <linux/filter.h> 14 #include <asm/cacheflush.h> 15 16 static inline bool rvc_enabled(void) 17 { 18 return IS_ENABLED(CONFIG_RISCV_ISA_C); 19 } 20 21 enum { 22 RV_REG_ZERO = 0, /* The constant value 0 */ 23 RV_REG_RA = 1, /* Return address */ 24 RV_REG_SP = 2, /* Stack pointer */ 25 RV_REG_GP = 3, /* Global pointer */ 26 RV_REG_TP = 4, /* Thread pointer */ 27 RV_REG_T0 = 5, /* Temporaries */ 28 RV_REG_T1 = 6, 29 RV_REG_T2 = 7, 30 RV_REG_FP = 8, /* Saved register/frame pointer */ 31 RV_REG_S1 = 9, /* Saved register */ 32 RV_REG_A0 = 10, /* Function argument/return values */ 33 RV_REG_A1 = 11, /* Function arguments */ 34 RV_REG_A2 = 12, 35 RV_REG_A3 = 13, 36 RV_REG_A4 = 14, 37 RV_REG_A5 = 15, 38 RV_REG_A6 = 16, 39 RV_REG_A7 = 17, 40 RV_REG_S2 = 18, /* Saved registers */ 41 RV_REG_S3 = 19, 42 RV_REG_S4 = 20, 43 RV_REG_S5 = 21, 44 RV_REG_S6 = 22, 45 RV_REG_S7 = 23, 46 RV_REG_S8 = 24, 47 RV_REG_S9 = 25, 48 RV_REG_S10 = 26, 49 RV_REG_S11 = 27, 50 RV_REG_T3 = 28, /* Temporaries */ 51 RV_REG_T4 = 29, 52 RV_REG_T5 = 30, 53 RV_REG_T6 = 31, 54 }; 55 56 static inline bool is_creg(u8 reg) 57 { 58 return (1 << reg) & (BIT(RV_REG_FP) | 59 BIT(RV_REG_S1) | 60 BIT(RV_REG_A0) | 61 BIT(RV_REG_A1) | 62 BIT(RV_REG_A2) | 63 BIT(RV_REG_A3) | 64 BIT(RV_REG_A4) | 65 BIT(RV_REG_A5)); 66 } 67 68 struct rv_jit_context { 69 struct bpf_prog *prog; 70 u16 *insns; /* RV insns */ 71 int ninsns; 72 int epilogue_offset; 73 int *offset; /* BPF to RV */ 74 int nexentries; 75 unsigned long flags; 76 int stack_size; 77 }; 78 79 /* Convert from ninsns to bytes. */ 80 static inline int ninsns_rvoff(int ninsns) 81 { 82 return ninsns << 1; 83 } 84 85 struct rv_jit_data { 86 struct bpf_binary_header *header; 87 u8 *image; 88 struct rv_jit_context ctx; 89 }; 90 91 static inline void bpf_fill_ill_insns(void *area, unsigned int size) 92 { 93 memset(area, 0, size); 94 } 95 96 static inline void bpf_flush_icache(void *start, void *end) 97 { 98 flush_icache_range((unsigned long)start, (unsigned long)end); 99 } 100 101 /* Emit a 4-byte riscv instruction. */ 102 static inline void emit(const u32 insn, struct rv_jit_context *ctx) 103 { 104 if (ctx->insns) { 105 ctx->insns[ctx->ninsns] = insn; 106 ctx->insns[ctx->ninsns + 1] = (insn >> 16); 107 } 108 109 ctx->ninsns += 2; 110 } 111 112 /* Emit a 2-byte riscv compressed instruction. */ 113 static inline void emitc(const u16 insn, struct rv_jit_context *ctx) 114 { 115 BUILD_BUG_ON(!rvc_enabled()); 116 117 if (ctx->insns) 118 ctx->insns[ctx->ninsns] = insn; 119 120 ctx->ninsns++; 121 } 122 123 static inline int epilogue_offset(struct rv_jit_context *ctx) 124 { 125 int to = ctx->epilogue_offset, from = ctx->ninsns; 126 127 return ninsns_rvoff(to - from); 128 } 129 130 /* Return -1 or inverted cond. */ 131 static inline int invert_bpf_cond(u8 cond) 132 { 133 switch (cond) { 134 case BPF_JEQ: 135 return BPF_JNE; 136 case BPF_JGT: 137 return BPF_JLE; 138 case BPF_JLT: 139 return BPF_JGE; 140 case BPF_JGE: 141 return BPF_JLT; 142 case BPF_JLE: 143 return BPF_JGT; 144 case BPF_JNE: 145 return BPF_JEQ; 146 case BPF_JSGT: 147 return BPF_JSLE; 148 case BPF_JSLT: 149 return BPF_JSGE; 150 case BPF_JSGE: 151 return BPF_JSLT; 152 case BPF_JSLE: 153 return BPF_JSGT; 154 } 155 return -1; 156 } 157 158 static inline bool is_6b_int(long val) 159 { 160 return -(1L << 5) <= val && val < (1L << 5); 161 } 162 163 static inline bool is_7b_uint(unsigned long val) 164 { 165 return val < (1UL << 7); 166 } 167 168 static inline bool is_8b_uint(unsigned long val) 169 { 170 return val < (1UL << 8); 171 } 172 173 static inline bool is_9b_uint(unsigned long val) 174 { 175 return val < (1UL << 9); 176 } 177 178 static inline bool is_10b_int(long val) 179 { 180 return -(1L << 9) <= val && val < (1L << 9); 181 } 182 183 static inline bool is_10b_uint(unsigned long val) 184 { 185 return val < (1UL << 10); 186 } 187 188 static inline bool is_12b_int(long val) 189 { 190 return -(1L << 11) <= val && val < (1L << 11); 191 } 192 193 static inline int is_12b_check(int off, int insn) 194 { 195 if (!is_12b_int(off)) { 196 pr_err("bpf-jit: insn=%d 12b < offset=%d not supported yet!\n", 197 insn, (int)off); 198 return -1; 199 } 200 return 0; 201 } 202 203 static inline bool is_13b_int(long val) 204 { 205 return -(1L << 12) <= val && val < (1L << 12); 206 } 207 208 static inline bool is_21b_int(long val) 209 { 210 return -(1L << 20) <= val && val < (1L << 20); 211 } 212 213 static inline int rv_offset(int insn, int off, struct rv_jit_context *ctx) 214 { 215 int from, to; 216 217 off++; /* BPF branch is from PC+1, RV is from PC */ 218 from = (insn > 0) ? ctx->offset[insn - 1] : 0; 219 to = (insn + off > 0) ? ctx->offset[insn + off - 1] : 0; 220 return ninsns_rvoff(to - from); 221 } 222 223 /* Instruction formats. */ 224 225 static inline u32 rv_r_insn(u8 funct7, u8 rs2, u8 rs1, u8 funct3, u8 rd, 226 u8 opcode) 227 { 228 return (funct7 << 25) | (rs2 << 20) | (rs1 << 15) | (funct3 << 12) | 229 (rd << 7) | opcode; 230 } 231 232 static inline u32 rv_i_insn(u16 imm11_0, u8 rs1, u8 funct3, u8 rd, u8 opcode) 233 { 234 return (imm11_0 << 20) | (rs1 << 15) | (funct3 << 12) | (rd << 7) | 235 opcode; 236 } 237 238 static inline u32 rv_s_insn(u16 imm11_0, u8 rs2, u8 rs1, u8 funct3, u8 opcode) 239 { 240 u8 imm11_5 = imm11_0 >> 5, imm4_0 = imm11_0 & 0x1f; 241 242 return (imm11_5 << 25) | (rs2 << 20) | (rs1 << 15) | (funct3 << 12) | 243 (imm4_0 << 7) | opcode; 244 } 245 246 static inline u32 rv_b_insn(u16 imm12_1, u8 rs2, u8 rs1, u8 funct3, u8 opcode) 247 { 248 u8 imm12 = ((imm12_1 & 0x800) >> 5) | ((imm12_1 & 0x3f0) >> 4); 249 u8 imm4_1 = ((imm12_1 & 0xf) << 1) | ((imm12_1 & 0x400) >> 10); 250 251 return (imm12 << 25) | (rs2 << 20) | (rs1 << 15) | (funct3 << 12) | 252 (imm4_1 << 7) | opcode; 253 } 254 255 static inline u32 rv_u_insn(u32 imm31_12, u8 rd, u8 opcode) 256 { 257 return (imm31_12 << 12) | (rd << 7) | opcode; 258 } 259 260 static inline u32 rv_j_insn(u32 imm20_1, u8 rd, u8 opcode) 261 { 262 u32 imm; 263 264 imm = (imm20_1 & 0x80000) | ((imm20_1 & 0x3ff) << 9) | 265 ((imm20_1 & 0x400) >> 2) | ((imm20_1 & 0x7f800) >> 11); 266 267 return (imm << 12) | (rd << 7) | opcode; 268 } 269 270 static inline u32 rv_amo_insn(u8 funct5, u8 aq, u8 rl, u8 rs2, u8 rs1, 271 u8 funct3, u8 rd, u8 opcode) 272 { 273 u8 funct7 = (funct5 << 2) | (aq << 1) | rl; 274 275 return rv_r_insn(funct7, rs2, rs1, funct3, rd, opcode); 276 } 277 278 /* RISC-V compressed instruction formats. */ 279 280 static inline u16 rv_cr_insn(u8 funct4, u8 rd, u8 rs2, u8 op) 281 { 282 return (funct4 << 12) | (rd << 7) | (rs2 << 2) | op; 283 } 284 285 static inline u16 rv_ci_insn(u8 funct3, u32 imm6, u8 rd, u8 op) 286 { 287 u32 imm; 288 289 imm = ((imm6 & 0x20) << 7) | ((imm6 & 0x1f) << 2); 290 return (funct3 << 13) | (rd << 7) | op | imm; 291 } 292 293 static inline u16 rv_css_insn(u8 funct3, u32 uimm, u8 rs2, u8 op) 294 { 295 return (funct3 << 13) | (uimm << 7) | (rs2 << 2) | op; 296 } 297 298 static inline u16 rv_ciw_insn(u8 funct3, u32 uimm, u8 rd, u8 op) 299 { 300 return (funct3 << 13) | (uimm << 5) | ((rd & 0x7) << 2) | op; 301 } 302 303 static inline u16 rv_cl_insn(u8 funct3, u32 imm_hi, u8 rs1, u32 imm_lo, u8 rd, 304 u8 op) 305 { 306 return (funct3 << 13) | (imm_hi << 10) | ((rs1 & 0x7) << 7) | 307 (imm_lo << 5) | ((rd & 0x7) << 2) | op; 308 } 309 310 static inline u16 rv_cs_insn(u8 funct3, u32 imm_hi, u8 rs1, u32 imm_lo, u8 rs2, 311 u8 op) 312 { 313 return (funct3 << 13) | (imm_hi << 10) | ((rs1 & 0x7) << 7) | 314 (imm_lo << 5) | ((rs2 & 0x7) << 2) | op; 315 } 316 317 static inline u16 rv_ca_insn(u8 funct6, u8 rd, u8 funct2, u8 rs2, u8 op) 318 { 319 return (funct6 << 10) | ((rd & 0x7) << 7) | (funct2 << 5) | 320 ((rs2 & 0x7) << 2) | op; 321 } 322 323 static inline u16 rv_cb_insn(u8 funct3, u32 imm6, u8 funct2, u8 rd, u8 op) 324 { 325 u32 imm; 326 327 imm = ((imm6 & 0x20) << 7) | ((imm6 & 0x1f) << 2); 328 return (funct3 << 13) | (funct2 << 10) | ((rd & 0x7) << 7) | op | imm; 329 } 330 331 /* Instructions shared by both RV32 and RV64. */ 332 333 static inline u32 rv_addi(u8 rd, u8 rs1, u16 imm11_0) 334 { 335 return rv_i_insn(imm11_0, rs1, 0, rd, 0x13); 336 } 337 338 static inline u32 rv_andi(u8 rd, u8 rs1, u16 imm11_0) 339 { 340 return rv_i_insn(imm11_0, rs1, 7, rd, 0x13); 341 } 342 343 static inline u32 rv_ori(u8 rd, u8 rs1, u16 imm11_0) 344 { 345 return rv_i_insn(imm11_0, rs1, 6, rd, 0x13); 346 } 347 348 static inline u32 rv_xori(u8 rd, u8 rs1, u16 imm11_0) 349 { 350 return rv_i_insn(imm11_0, rs1, 4, rd, 0x13); 351 } 352 353 static inline u32 rv_slli(u8 rd, u8 rs1, u16 imm11_0) 354 { 355 return rv_i_insn(imm11_0, rs1, 1, rd, 0x13); 356 } 357 358 static inline u32 rv_srli(u8 rd, u8 rs1, u16 imm11_0) 359 { 360 return rv_i_insn(imm11_0, rs1, 5, rd, 0x13); 361 } 362 363 static inline u32 rv_srai(u8 rd, u8 rs1, u16 imm11_0) 364 { 365 return rv_i_insn(0x400 | imm11_0, rs1, 5, rd, 0x13); 366 } 367 368 static inline u32 rv_lui(u8 rd, u32 imm31_12) 369 { 370 return rv_u_insn(imm31_12, rd, 0x37); 371 } 372 373 static inline u32 rv_auipc(u8 rd, u32 imm31_12) 374 { 375 return rv_u_insn(imm31_12, rd, 0x17); 376 } 377 378 static inline u32 rv_add(u8 rd, u8 rs1, u8 rs2) 379 { 380 return rv_r_insn(0, rs2, rs1, 0, rd, 0x33); 381 } 382 383 static inline u32 rv_sub(u8 rd, u8 rs1, u8 rs2) 384 { 385 return rv_r_insn(0x20, rs2, rs1, 0, rd, 0x33); 386 } 387 388 static inline u32 rv_sltu(u8 rd, u8 rs1, u8 rs2) 389 { 390 return rv_r_insn(0, rs2, rs1, 3, rd, 0x33); 391 } 392 393 static inline u32 rv_and(u8 rd, u8 rs1, u8 rs2) 394 { 395 return rv_r_insn(0, rs2, rs1, 7, rd, 0x33); 396 } 397 398 static inline u32 rv_or(u8 rd, u8 rs1, u8 rs2) 399 { 400 return rv_r_insn(0, rs2, rs1, 6, rd, 0x33); 401 } 402 403 static inline u32 rv_xor(u8 rd, u8 rs1, u8 rs2) 404 { 405 return rv_r_insn(0, rs2, rs1, 4, rd, 0x33); 406 } 407 408 static inline u32 rv_sll(u8 rd, u8 rs1, u8 rs2) 409 { 410 return rv_r_insn(0, rs2, rs1, 1, rd, 0x33); 411 } 412 413 static inline u32 rv_srl(u8 rd, u8 rs1, u8 rs2) 414 { 415 return rv_r_insn(0, rs2, rs1, 5, rd, 0x33); 416 } 417 418 static inline u32 rv_sra(u8 rd, u8 rs1, u8 rs2) 419 { 420 return rv_r_insn(0x20, rs2, rs1, 5, rd, 0x33); 421 } 422 423 static inline u32 rv_mul(u8 rd, u8 rs1, u8 rs2) 424 { 425 return rv_r_insn(1, rs2, rs1, 0, rd, 0x33); 426 } 427 428 static inline u32 rv_mulhu(u8 rd, u8 rs1, u8 rs2) 429 { 430 return rv_r_insn(1, rs2, rs1, 3, rd, 0x33); 431 } 432 433 static inline u32 rv_divu(u8 rd, u8 rs1, u8 rs2) 434 { 435 return rv_r_insn(1, rs2, rs1, 5, rd, 0x33); 436 } 437 438 static inline u32 rv_remu(u8 rd, u8 rs1, u8 rs2) 439 { 440 return rv_r_insn(1, rs2, rs1, 7, rd, 0x33); 441 } 442 443 static inline u32 rv_jal(u8 rd, u32 imm20_1) 444 { 445 return rv_j_insn(imm20_1, rd, 0x6f); 446 } 447 448 static inline u32 rv_jalr(u8 rd, u8 rs1, u16 imm11_0) 449 { 450 return rv_i_insn(imm11_0, rs1, 0, rd, 0x67); 451 } 452 453 static inline u32 rv_beq(u8 rs1, u8 rs2, u16 imm12_1) 454 { 455 return rv_b_insn(imm12_1, rs2, rs1, 0, 0x63); 456 } 457 458 static inline u32 rv_bne(u8 rs1, u8 rs2, u16 imm12_1) 459 { 460 return rv_b_insn(imm12_1, rs2, rs1, 1, 0x63); 461 } 462 463 static inline u32 rv_bltu(u8 rs1, u8 rs2, u16 imm12_1) 464 { 465 return rv_b_insn(imm12_1, rs2, rs1, 6, 0x63); 466 } 467 468 static inline u32 rv_bgtu(u8 rs1, u8 rs2, u16 imm12_1) 469 { 470 return rv_bltu(rs2, rs1, imm12_1); 471 } 472 473 static inline u32 rv_bgeu(u8 rs1, u8 rs2, u16 imm12_1) 474 { 475 return rv_b_insn(imm12_1, rs2, rs1, 7, 0x63); 476 } 477 478 static inline u32 rv_bleu(u8 rs1, u8 rs2, u16 imm12_1) 479 { 480 return rv_bgeu(rs2, rs1, imm12_1); 481 } 482 483 static inline u32 rv_blt(u8 rs1, u8 rs2, u16 imm12_1) 484 { 485 return rv_b_insn(imm12_1, rs2, rs1, 4, 0x63); 486 } 487 488 static inline u32 rv_bgt(u8 rs1, u8 rs2, u16 imm12_1) 489 { 490 return rv_blt(rs2, rs1, imm12_1); 491 } 492 493 static inline u32 rv_bge(u8 rs1, u8 rs2, u16 imm12_1) 494 { 495 return rv_b_insn(imm12_1, rs2, rs1, 5, 0x63); 496 } 497 498 static inline u32 rv_ble(u8 rs1, u8 rs2, u16 imm12_1) 499 { 500 return rv_bge(rs2, rs1, imm12_1); 501 } 502 503 static inline u32 rv_lw(u8 rd, u16 imm11_0, u8 rs1) 504 { 505 return rv_i_insn(imm11_0, rs1, 2, rd, 0x03); 506 } 507 508 static inline u32 rv_lbu(u8 rd, u16 imm11_0, u8 rs1) 509 { 510 return rv_i_insn(imm11_0, rs1, 4, rd, 0x03); 511 } 512 513 static inline u32 rv_lhu(u8 rd, u16 imm11_0, u8 rs1) 514 { 515 return rv_i_insn(imm11_0, rs1, 5, rd, 0x03); 516 } 517 518 static inline u32 rv_sb(u8 rs1, u16 imm11_0, u8 rs2) 519 { 520 return rv_s_insn(imm11_0, rs2, rs1, 0, 0x23); 521 } 522 523 static inline u32 rv_sh(u8 rs1, u16 imm11_0, u8 rs2) 524 { 525 return rv_s_insn(imm11_0, rs2, rs1, 1, 0x23); 526 } 527 528 static inline u32 rv_sw(u8 rs1, u16 imm11_0, u8 rs2) 529 { 530 return rv_s_insn(imm11_0, rs2, rs1, 2, 0x23); 531 } 532 533 static inline u32 rv_amoadd_w(u8 rd, u8 rs2, u8 rs1, u8 aq, u8 rl) 534 { 535 return rv_amo_insn(0, aq, rl, rs2, rs1, 2, rd, 0x2f); 536 } 537 538 /* RVC instrutions. */ 539 540 static inline u16 rvc_addi4spn(u8 rd, u32 imm10) 541 { 542 u32 imm; 543 544 imm = ((imm10 & 0x30) << 2) | ((imm10 & 0x3c0) >> 4) | 545 ((imm10 & 0x4) >> 1) | ((imm10 & 0x8) >> 3); 546 return rv_ciw_insn(0x0, imm, rd, 0x0); 547 } 548 549 static inline u16 rvc_lw(u8 rd, u32 imm7, u8 rs1) 550 { 551 u32 imm_hi, imm_lo; 552 553 imm_hi = (imm7 & 0x38) >> 3; 554 imm_lo = ((imm7 & 0x4) >> 1) | ((imm7 & 0x40) >> 6); 555 return rv_cl_insn(0x2, imm_hi, rs1, imm_lo, rd, 0x0); 556 } 557 558 static inline u16 rvc_sw(u8 rs1, u32 imm7, u8 rs2) 559 { 560 u32 imm_hi, imm_lo; 561 562 imm_hi = (imm7 & 0x38) >> 3; 563 imm_lo = ((imm7 & 0x4) >> 1) | ((imm7 & 0x40) >> 6); 564 return rv_cs_insn(0x6, imm_hi, rs1, imm_lo, rs2, 0x0); 565 } 566 567 static inline u16 rvc_addi(u8 rd, u32 imm6) 568 { 569 return rv_ci_insn(0, imm6, rd, 0x1); 570 } 571 572 static inline u16 rvc_li(u8 rd, u32 imm6) 573 { 574 return rv_ci_insn(0x2, imm6, rd, 0x1); 575 } 576 577 static inline u16 rvc_addi16sp(u32 imm10) 578 { 579 u32 imm; 580 581 imm = ((imm10 & 0x200) >> 4) | (imm10 & 0x10) | ((imm10 & 0x40) >> 3) | 582 ((imm10 & 0x180) >> 6) | ((imm10 & 0x20) >> 5); 583 return rv_ci_insn(0x3, imm, RV_REG_SP, 0x1); 584 } 585 586 static inline u16 rvc_lui(u8 rd, u32 imm6) 587 { 588 return rv_ci_insn(0x3, imm6, rd, 0x1); 589 } 590 591 static inline u16 rvc_srli(u8 rd, u32 imm6) 592 { 593 return rv_cb_insn(0x4, imm6, 0, rd, 0x1); 594 } 595 596 static inline u16 rvc_srai(u8 rd, u32 imm6) 597 { 598 return rv_cb_insn(0x4, imm6, 0x1, rd, 0x1); 599 } 600 601 static inline u16 rvc_andi(u8 rd, u32 imm6) 602 { 603 return rv_cb_insn(0x4, imm6, 0x2, rd, 0x1); 604 } 605 606 static inline u16 rvc_sub(u8 rd, u8 rs) 607 { 608 return rv_ca_insn(0x23, rd, 0, rs, 0x1); 609 } 610 611 static inline u16 rvc_xor(u8 rd, u8 rs) 612 { 613 return rv_ca_insn(0x23, rd, 0x1, rs, 0x1); 614 } 615 616 static inline u16 rvc_or(u8 rd, u8 rs) 617 { 618 return rv_ca_insn(0x23, rd, 0x2, rs, 0x1); 619 } 620 621 static inline u16 rvc_and(u8 rd, u8 rs) 622 { 623 return rv_ca_insn(0x23, rd, 0x3, rs, 0x1); 624 } 625 626 static inline u16 rvc_slli(u8 rd, u32 imm6) 627 { 628 return rv_ci_insn(0, imm6, rd, 0x2); 629 } 630 631 static inline u16 rvc_lwsp(u8 rd, u32 imm8) 632 { 633 u32 imm; 634 635 imm = ((imm8 & 0xc0) >> 6) | (imm8 & 0x3c); 636 return rv_ci_insn(0x2, imm, rd, 0x2); 637 } 638 639 static inline u16 rvc_jr(u8 rs1) 640 { 641 return rv_cr_insn(0x8, rs1, RV_REG_ZERO, 0x2); 642 } 643 644 static inline u16 rvc_mv(u8 rd, u8 rs) 645 { 646 return rv_cr_insn(0x8, rd, rs, 0x2); 647 } 648 649 static inline u16 rvc_jalr(u8 rs1) 650 { 651 return rv_cr_insn(0x9, rs1, RV_REG_ZERO, 0x2); 652 } 653 654 static inline u16 rvc_add(u8 rd, u8 rs) 655 { 656 return rv_cr_insn(0x9, rd, rs, 0x2); 657 } 658 659 static inline u16 rvc_swsp(u32 imm8, u8 rs2) 660 { 661 u32 imm; 662 663 imm = (imm8 & 0x3c) | ((imm8 & 0xc0) >> 6); 664 return rv_css_insn(0x6, imm, rs2, 0x2); 665 } 666 667 /* 668 * RV64-only instructions. 669 * 670 * These instructions are not available on RV32. Wrap them below a #if to 671 * ensure that the RV32 JIT doesn't emit any of these instructions. 672 */ 673 674 #if __riscv_xlen == 64 675 676 static inline u32 rv_addiw(u8 rd, u8 rs1, u16 imm11_0) 677 { 678 return rv_i_insn(imm11_0, rs1, 0, rd, 0x1b); 679 } 680 681 static inline u32 rv_slliw(u8 rd, u8 rs1, u16 imm11_0) 682 { 683 return rv_i_insn(imm11_0, rs1, 1, rd, 0x1b); 684 } 685 686 static inline u32 rv_srliw(u8 rd, u8 rs1, u16 imm11_0) 687 { 688 return rv_i_insn(imm11_0, rs1, 5, rd, 0x1b); 689 } 690 691 static inline u32 rv_sraiw(u8 rd, u8 rs1, u16 imm11_0) 692 { 693 return rv_i_insn(0x400 | imm11_0, rs1, 5, rd, 0x1b); 694 } 695 696 static inline u32 rv_addw(u8 rd, u8 rs1, u8 rs2) 697 { 698 return rv_r_insn(0, rs2, rs1, 0, rd, 0x3b); 699 } 700 701 static inline u32 rv_subw(u8 rd, u8 rs1, u8 rs2) 702 { 703 return rv_r_insn(0x20, rs2, rs1, 0, rd, 0x3b); 704 } 705 706 static inline u32 rv_sllw(u8 rd, u8 rs1, u8 rs2) 707 { 708 return rv_r_insn(0, rs2, rs1, 1, rd, 0x3b); 709 } 710 711 static inline u32 rv_srlw(u8 rd, u8 rs1, u8 rs2) 712 { 713 return rv_r_insn(0, rs2, rs1, 5, rd, 0x3b); 714 } 715 716 static inline u32 rv_sraw(u8 rd, u8 rs1, u8 rs2) 717 { 718 return rv_r_insn(0x20, rs2, rs1, 5, rd, 0x3b); 719 } 720 721 static inline u32 rv_mulw(u8 rd, u8 rs1, u8 rs2) 722 { 723 return rv_r_insn(1, rs2, rs1, 0, rd, 0x3b); 724 } 725 726 static inline u32 rv_divuw(u8 rd, u8 rs1, u8 rs2) 727 { 728 return rv_r_insn(1, rs2, rs1, 5, rd, 0x3b); 729 } 730 731 static inline u32 rv_remuw(u8 rd, u8 rs1, u8 rs2) 732 { 733 return rv_r_insn(1, rs2, rs1, 7, rd, 0x3b); 734 } 735 736 static inline u32 rv_ld(u8 rd, u16 imm11_0, u8 rs1) 737 { 738 return rv_i_insn(imm11_0, rs1, 3, rd, 0x03); 739 } 740 741 static inline u32 rv_lwu(u8 rd, u16 imm11_0, u8 rs1) 742 { 743 return rv_i_insn(imm11_0, rs1, 6, rd, 0x03); 744 } 745 746 static inline u32 rv_sd(u8 rs1, u16 imm11_0, u8 rs2) 747 { 748 return rv_s_insn(imm11_0, rs2, rs1, 3, 0x23); 749 } 750 751 static inline u32 rv_amoadd_d(u8 rd, u8 rs2, u8 rs1, u8 aq, u8 rl) 752 { 753 return rv_amo_insn(0, aq, rl, rs2, rs1, 3, rd, 0x2f); 754 } 755 756 /* RV64-only RVC instructions. */ 757 758 static inline u16 rvc_ld(u8 rd, u32 imm8, u8 rs1) 759 { 760 u32 imm_hi, imm_lo; 761 762 imm_hi = (imm8 & 0x38) >> 3; 763 imm_lo = (imm8 & 0xc0) >> 6; 764 return rv_cl_insn(0x3, imm_hi, rs1, imm_lo, rd, 0x0); 765 } 766 767 static inline u16 rvc_sd(u8 rs1, u32 imm8, u8 rs2) 768 { 769 u32 imm_hi, imm_lo; 770 771 imm_hi = (imm8 & 0x38) >> 3; 772 imm_lo = (imm8 & 0xc0) >> 6; 773 return rv_cs_insn(0x7, imm_hi, rs1, imm_lo, rs2, 0x0); 774 } 775 776 static inline u16 rvc_subw(u8 rd, u8 rs) 777 { 778 return rv_ca_insn(0x27, rd, 0, rs, 0x1); 779 } 780 781 static inline u16 rvc_addiw(u8 rd, u32 imm6) 782 { 783 return rv_ci_insn(0x1, imm6, rd, 0x1); 784 } 785 786 static inline u16 rvc_ldsp(u8 rd, u32 imm9) 787 { 788 u32 imm; 789 790 imm = ((imm9 & 0x1c0) >> 6) | (imm9 & 0x38); 791 return rv_ci_insn(0x3, imm, rd, 0x2); 792 } 793 794 static inline u16 rvc_sdsp(u32 imm9, u8 rs2) 795 { 796 u32 imm; 797 798 imm = (imm9 & 0x38) | ((imm9 & 0x1c0) >> 6); 799 return rv_css_insn(0x7, imm, rs2, 0x2); 800 } 801 802 #endif /* __riscv_xlen == 64 */ 803 804 /* Helper functions that emit RVC instructions when possible. */ 805 806 static inline void emit_jalr(u8 rd, u8 rs, s32 imm, struct rv_jit_context *ctx) 807 { 808 if (rvc_enabled() && rd == RV_REG_RA && rs && !imm) 809 emitc(rvc_jalr(rs), ctx); 810 else if (rvc_enabled() && !rd && rs && !imm) 811 emitc(rvc_jr(rs), ctx); 812 else 813 emit(rv_jalr(rd, rs, imm), ctx); 814 } 815 816 static inline void emit_mv(u8 rd, u8 rs, struct rv_jit_context *ctx) 817 { 818 if (rvc_enabled() && rd && rs) 819 emitc(rvc_mv(rd, rs), ctx); 820 else 821 emit(rv_addi(rd, rs, 0), ctx); 822 } 823 824 static inline void emit_add(u8 rd, u8 rs1, u8 rs2, struct rv_jit_context *ctx) 825 { 826 if (rvc_enabled() && rd && rd == rs1 && rs2) 827 emitc(rvc_add(rd, rs2), ctx); 828 else 829 emit(rv_add(rd, rs1, rs2), ctx); 830 } 831 832 static inline void emit_addi(u8 rd, u8 rs, s32 imm, struct rv_jit_context *ctx) 833 { 834 if (rvc_enabled() && rd == RV_REG_SP && rd == rs && is_10b_int(imm) && imm && !(imm & 0xf)) 835 emitc(rvc_addi16sp(imm), ctx); 836 else if (rvc_enabled() && is_creg(rd) && rs == RV_REG_SP && is_10b_uint(imm) && 837 !(imm & 0x3) && imm) 838 emitc(rvc_addi4spn(rd, imm), ctx); 839 else if (rvc_enabled() && rd && rd == rs && imm && is_6b_int(imm)) 840 emitc(rvc_addi(rd, imm), ctx); 841 else 842 emit(rv_addi(rd, rs, imm), ctx); 843 } 844 845 static inline void emit_li(u8 rd, s32 imm, struct rv_jit_context *ctx) 846 { 847 if (rvc_enabled() && rd && is_6b_int(imm)) 848 emitc(rvc_li(rd, imm), ctx); 849 else 850 emit(rv_addi(rd, RV_REG_ZERO, imm), ctx); 851 } 852 853 static inline void emit_lui(u8 rd, s32 imm, struct rv_jit_context *ctx) 854 { 855 if (rvc_enabled() && rd && rd != RV_REG_SP && is_6b_int(imm) && imm) 856 emitc(rvc_lui(rd, imm), ctx); 857 else 858 emit(rv_lui(rd, imm), ctx); 859 } 860 861 static inline void emit_slli(u8 rd, u8 rs, s32 imm, struct rv_jit_context *ctx) 862 { 863 if (rvc_enabled() && rd && rd == rs && imm && (u32)imm < __riscv_xlen) 864 emitc(rvc_slli(rd, imm), ctx); 865 else 866 emit(rv_slli(rd, rs, imm), ctx); 867 } 868 869 static inline void emit_andi(u8 rd, u8 rs, s32 imm, struct rv_jit_context *ctx) 870 { 871 if (rvc_enabled() && is_creg(rd) && rd == rs && is_6b_int(imm)) 872 emitc(rvc_andi(rd, imm), ctx); 873 else 874 emit(rv_andi(rd, rs, imm), ctx); 875 } 876 877 static inline void emit_srli(u8 rd, u8 rs, s32 imm, struct rv_jit_context *ctx) 878 { 879 if (rvc_enabled() && is_creg(rd) && rd == rs && imm && (u32)imm < __riscv_xlen) 880 emitc(rvc_srli(rd, imm), ctx); 881 else 882 emit(rv_srli(rd, rs, imm), ctx); 883 } 884 885 static inline void emit_srai(u8 rd, u8 rs, s32 imm, struct rv_jit_context *ctx) 886 { 887 if (rvc_enabled() && is_creg(rd) && rd == rs && imm && (u32)imm < __riscv_xlen) 888 emitc(rvc_srai(rd, imm), ctx); 889 else 890 emit(rv_srai(rd, rs, imm), ctx); 891 } 892 893 static inline void emit_sub(u8 rd, u8 rs1, u8 rs2, struct rv_jit_context *ctx) 894 { 895 if (rvc_enabled() && is_creg(rd) && rd == rs1 && is_creg(rs2)) 896 emitc(rvc_sub(rd, rs2), ctx); 897 else 898 emit(rv_sub(rd, rs1, rs2), ctx); 899 } 900 901 static inline void emit_or(u8 rd, u8 rs1, u8 rs2, struct rv_jit_context *ctx) 902 { 903 if (rvc_enabled() && is_creg(rd) && rd == rs1 && is_creg(rs2)) 904 emitc(rvc_or(rd, rs2), ctx); 905 else 906 emit(rv_or(rd, rs1, rs2), ctx); 907 } 908 909 static inline void emit_and(u8 rd, u8 rs1, u8 rs2, struct rv_jit_context *ctx) 910 { 911 if (rvc_enabled() && is_creg(rd) && rd == rs1 && is_creg(rs2)) 912 emitc(rvc_and(rd, rs2), ctx); 913 else 914 emit(rv_and(rd, rs1, rs2), ctx); 915 } 916 917 static inline void emit_xor(u8 rd, u8 rs1, u8 rs2, struct rv_jit_context *ctx) 918 { 919 if (rvc_enabled() && is_creg(rd) && rd == rs1 && is_creg(rs2)) 920 emitc(rvc_xor(rd, rs2), ctx); 921 else 922 emit(rv_xor(rd, rs1, rs2), ctx); 923 } 924 925 static inline void emit_lw(u8 rd, s32 off, u8 rs1, struct rv_jit_context *ctx) 926 { 927 if (rvc_enabled() && rs1 == RV_REG_SP && rd && is_8b_uint(off) && !(off & 0x3)) 928 emitc(rvc_lwsp(rd, off), ctx); 929 else if (rvc_enabled() && is_creg(rd) && is_creg(rs1) && is_7b_uint(off) && !(off & 0x3)) 930 emitc(rvc_lw(rd, off, rs1), ctx); 931 else 932 emit(rv_lw(rd, off, rs1), ctx); 933 } 934 935 static inline void emit_sw(u8 rs1, s32 off, u8 rs2, struct rv_jit_context *ctx) 936 { 937 if (rvc_enabled() && rs1 == RV_REG_SP && is_8b_uint(off) && !(off & 0x3)) 938 emitc(rvc_swsp(off, rs2), ctx); 939 else if (rvc_enabled() && is_creg(rs1) && is_creg(rs2) && is_7b_uint(off) && !(off & 0x3)) 940 emitc(rvc_sw(rs1, off, rs2), ctx); 941 else 942 emit(rv_sw(rs1, off, rs2), ctx); 943 } 944 945 /* RV64-only helper functions. */ 946 #if __riscv_xlen == 64 947 948 static inline void emit_addiw(u8 rd, u8 rs, s32 imm, struct rv_jit_context *ctx) 949 { 950 if (rvc_enabled() && rd && rd == rs && is_6b_int(imm)) 951 emitc(rvc_addiw(rd, imm), ctx); 952 else 953 emit(rv_addiw(rd, rs, imm), ctx); 954 } 955 956 static inline void emit_ld(u8 rd, s32 off, u8 rs1, struct rv_jit_context *ctx) 957 { 958 if (rvc_enabled() && rs1 == RV_REG_SP && rd && is_9b_uint(off) && !(off & 0x7)) 959 emitc(rvc_ldsp(rd, off), ctx); 960 else if (rvc_enabled() && is_creg(rd) && is_creg(rs1) && is_8b_uint(off) && !(off & 0x7)) 961 emitc(rvc_ld(rd, off, rs1), ctx); 962 else 963 emit(rv_ld(rd, off, rs1), ctx); 964 } 965 966 static inline void emit_sd(u8 rs1, s32 off, u8 rs2, struct rv_jit_context *ctx) 967 { 968 if (rvc_enabled() && rs1 == RV_REG_SP && is_9b_uint(off) && !(off & 0x7)) 969 emitc(rvc_sdsp(off, rs2), ctx); 970 else if (rvc_enabled() && is_creg(rs1) && is_creg(rs2) && is_8b_uint(off) && !(off & 0x7)) 971 emitc(rvc_sd(rs1, off, rs2), ctx); 972 else 973 emit(rv_sd(rs1, off, rs2), ctx); 974 } 975 976 static inline void emit_subw(u8 rd, u8 rs1, u8 rs2, struct rv_jit_context *ctx) 977 { 978 if (rvc_enabled() && is_creg(rd) && rd == rs1 && is_creg(rs2)) 979 emitc(rvc_subw(rd, rs2), ctx); 980 else 981 emit(rv_subw(rd, rs1, rs2), ctx); 982 } 983 984 #endif /* __riscv_xlen == 64 */ 985 986 void bpf_jit_build_prologue(struct rv_jit_context *ctx); 987 void bpf_jit_build_epilogue(struct rv_jit_context *ctx); 988 989 int bpf_jit_emit_insn(const struct bpf_insn *insn, struct rv_jit_context *ctx, 990 bool extra_pass); 991 992 #endif /* _BPF_JIT_H */ 993