1 /* 2 * Tiny Code Generator for QEMU 3 * 4 * Copyright (c) 2008 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #ifndef TCG_H 26 #define TCG_H 27 28 #include "exec/memop.h" 29 #include "exec/memopidx.h" 30 #include "qemu/bitops.h" 31 #include "qemu/plugin.h" 32 #include "qemu/queue.h" 33 #include "tcg/tcg-mo.h" 34 #include "tcg-target-reg-bits.h" 35 #include "tcg-target.h" 36 #include "tcg/tcg-cond.h" 37 #include "tcg/debug-assert.h" 38 39 /* XXX: make safe guess about sizes */ 40 #define MAX_OP_PER_INSTR 266 41 42 #define MAX_CALL_IARGS 7 43 44 #define CPU_TEMP_BUF_NLONGS 128 45 #define TCG_STATIC_FRAME_SIZE (CPU_TEMP_BUF_NLONGS * sizeof(long)) 46 47 #if TCG_TARGET_REG_BITS == 32 48 typedef int32_t tcg_target_long; 49 typedef uint32_t tcg_target_ulong; 50 #define TCG_PRIlx PRIx32 51 #define TCG_PRIld PRId32 52 #elif TCG_TARGET_REG_BITS == 64 53 typedef int64_t tcg_target_long; 54 typedef uint64_t tcg_target_ulong; 55 #define TCG_PRIlx PRIx64 56 #define TCG_PRIld PRId64 57 #else 58 #error unsupported 59 #endif 60 61 #if TCG_TARGET_NB_REGS <= 32 62 typedef uint32_t TCGRegSet; 63 #elif TCG_TARGET_NB_REGS <= 64 64 typedef uint64_t TCGRegSet; 65 #else 66 #error unsupported 67 #endif 68 69 #if TCG_TARGET_REG_BITS == 32 70 /* Turn some undef macros into false macros. */ 71 #define TCG_TARGET_HAS_extr_i64_i32 0 72 #define TCG_TARGET_HAS_div_i64 0 73 #define TCG_TARGET_HAS_rem_i64 0 74 #define TCG_TARGET_HAS_div2_i64 0 75 #define TCG_TARGET_HAS_rot_i64 0 76 #define TCG_TARGET_HAS_ext8s_i64 0 77 #define TCG_TARGET_HAS_ext16s_i64 0 78 #define TCG_TARGET_HAS_ext32s_i64 0 79 #define TCG_TARGET_HAS_ext8u_i64 0 80 #define TCG_TARGET_HAS_ext16u_i64 0 81 #define TCG_TARGET_HAS_ext32u_i64 0 82 #define TCG_TARGET_HAS_bswap16_i64 0 83 #define TCG_TARGET_HAS_bswap32_i64 0 84 #define TCG_TARGET_HAS_bswap64_i64 0 85 #define TCG_TARGET_HAS_not_i64 0 86 #define TCG_TARGET_HAS_andc_i64 0 87 #define TCG_TARGET_HAS_orc_i64 0 88 #define TCG_TARGET_HAS_eqv_i64 0 89 #define TCG_TARGET_HAS_nand_i64 0 90 #define TCG_TARGET_HAS_nor_i64 0 91 #define TCG_TARGET_HAS_clz_i64 0 92 #define TCG_TARGET_HAS_ctz_i64 0 93 #define TCG_TARGET_HAS_ctpop_i64 0 94 #define TCG_TARGET_HAS_deposit_i64 0 95 #define TCG_TARGET_HAS_extract_i64 0 96 #define TCG_TARGET_HAS_sextract_i64 0 97 #define TCG_TARGET_HAS_extract2_i64 0 98 #define TCG_TARGET_HAS_negsetcond_i64 0 99 #define TCG_TARGET_HAS_add2_i64 0 100 #define TCG_TARGET_HAS_sub2_i64 0 101 #define TCG_TARGET_HAS_mulu2_i64 0 102 #define TCG_TARGET_HAS_muls2_i64 0 103 #define TCG_TARGET_HAS_muluh_i64 0 104 #define TCG_TARGET_HAS_mulsh_i64 0 105 /* Turn some undef macros into true macros. */ 106 #define TCG_TARGET_HAS_add2_i32 1 107 #define TCG_TARGET_HAS_sub2_i32 1 108 #endif 109 110 #ifndef TCG_TARGET_deposit_i32_valid 111 #define TCG_TARGET_deposit_i32_valid(ofs, len) 1 112 #endif 113 #ifndef TCG_TARGET_deposit_i64_valid 114 #define TCG_TARGET_deposit_i64_valid(ofs, len) 1 115 #endif 116 #ifndef TCG_TARGET_extract_i32_valid 117 #define TCG_TARGET_extract_i32_valid(ofs, len) 1 118 #endif 119 #ifndef TCG_TARGET_extract_i64_valid 120 #define TCG_TARGET_extract_i64_valid(ofs, len) 1 121 #endif 122 123 /* Only one of DIV or DIV2 should be defined. */ 124 #if defined(TCG_TARGET_HAS_div_i32) 125 #define TCG_TARGET_HAS_div2_i32 0 126 #elif defined(TCG_TARGET_HAS_div2_i32) 127 #define TCG_TARGET_HAS_div_i32 0 128 #define TCG_TARGET_HAS_rem_i32 0 129 #endif 130 #if defined(TCG_TARGET_HAS_div_i64) 131 #define TCG_TARGET_HAS_div2_i64 0 132 #elif defined(TCG_TARGET_HAS_div2_i64) 133 #define TCG_TARGET_HAS_div_i64 0 134 #define TCG_TARGET_HAS_rem_i64 0 135 #endif 136 137 #if !defined(TCG_TARGET_HAS_v64) \ 138 && !defined(TCG_TARGET_HAS_v128) \ 139 && !defined(TCG_TARGET_HAS_v256) 140 #define TCG_TARGET_MAYBE_vec 0 141 #define TCG_TARGET_HAS_abs_vec 0 142 #define TCG_TARGET_HAS_neg_vec 0 143 #define TCG_TARGET_HAS_not_vec 0 144 #define TCG_TARGET_HAS_andc_vec 0 145 #define TCG_TARGET_HAS_orc_vec 0 146 #define TCG_TARGET_HAS_nand_vec 0 147 #define TCG_TARGET_HAS_nor_vec 0 148 #define TCG_TARGET_HAS_eqv_vec 0 149 #define TCG_TARGET_HAS_roti_vec 0 150 #define TCG_TARGET_HAS_rots_vec 0 151 #define TCG_TARGET_HAS_rotv_vec 0 152 #define TCG_TARGET_HAS_shi_vec 0 153 #define TCG_TARGET_HAS_shs_vec 0 154 #define TCG_TARGET_HAS_shv_vec 0 155 #define TCG_TARGET_HAS_mul_vec 0 156 #define TCG_TARGET_HAS_sat_vec 0 157 #define TCG_TARGET_HAS_minmax_vec 0 158 #define TCG_TARGET_HAS_bitsel_vec 0 159 #define TCG_TARGET_HAS_cmpsel_vec 0 160 #else 161 #define TCG_TARGET_MAYBE_vec 1 162 #endif 163 #ifndef TCG_TARGET_HAS_v64 164 #define TCG_TARGET_HAS_v64 0 165 #endif 166 #ifndef TCG_TARGET_HAS_v128 167 #define TCG_TARGET_HAS_v128 0 168 #endif 169 #ifndef TCG_TARGET_HAS_v256 170 #define TCG_TARGET_HAS_v256 0 171 #endif 172 173 typedef enum TCGOpcode { 174 #define DEF(name, oargs, iargs, cargs, flags) INDEX_op_ ## name, 175 #include "tcg/tcg-opc.h" 176 #undef DEF 177 NB_OPS, 178 } TCGOpcode; 179 180 #define tcg_regset_set_reg(d, r) ((d) |= (TCGRegSet)1 << (r)) 181 #define tcg_regset_reset_reg(d, r) ((d) &= ~((TCGRegSet)1 << (r))) 182 #define tcg_regset_test_reg(d, r) (((d) >> (r)) & 1) 183 184 #ifndef TCG_TARGET_INSN_UNIT_SIZE 185 # error "Missing TCG_TARGET_INSN_UNIT_SIZE" 186 #elif TCG_TARGET_INSN_UNIT_SIZE == 1 187 typedef uint8_t tcg_insn_unit; 188 #elif TCG_TARGET_INSN_UNIT_SIZE == 2 189 typedef uint16_t tcg_insn_unit; 190 #elif TCG_TARGET_INSN_UNIT_SIZE == 4 191 typedef uint32_t tcg_insn_unit; 192 #elif TCG_TARGET_INSN_UNIT_SIZE == 8 193 typedef uint64_t tcg_insn_unit; 194 #else 195 /* The port better have done this. */ 196 #endif 197 198 typedef struct TCGRelocation TCGRelocation; 199 struct TCGRelocation { 200 QSIMPLEQ_ENTRY(TCGRelocation) next; 201 tcg_insn_unit *ptr; 202 intptr_t addend; 203 int type; 204 }; 205 206 typedef struct TCGOp TCGOp; 207 typedef struct TCGLabelUse TCGLabelUse; 208 struct TCGLabelUse { 209 QSIMPLEQ_ENTRY(TCGLabelUse) next; 210 TCGOp *op; 211 }; 212 213 typedef struct TCGLabel TCGLabel; 214 struct TCGLabel { 215 bool present; 216 bool has_value; 217 uint16_t id; 218 union { 219 uintptr_t value; 220 const tcg_insn_unit *value_ptr; 221 } u; 222 QSIMPLEQ_HEAD(, TCGLabelUse) branches; 223 QSIMPLEQ_HEAD(, TCGRelocation) relocs; 224 QSIMPLEQ_ENTRY(TCGLabel) next; 225 }; 226 227 typedef struct TCGPool { 228 struct TCGPool *next; 229 int size; 230 uint8_t data[] __attribute__ ((aligned)); 231 } TCGPool; 232 233 #define TCG_POOL_CHUNK_SIZE 32768 234 235 #define TCG_MAX_TEMPS 512 236 #define TCG_MAX_INSNS 512 237 238 /* when the size of the arguments of a called function is smaller than 239 this value, they are statically allocated in the TB stack frame */ 240 #define TCG_STATIC_CALL_ARGS_SIZE 128 241 242 typedef enum TCGType { 243 TCG_TYPE_I32, 244 TCG_TYPE_I64, 245 TCG_TYPE_I128, 246 247 TCG_TYPE_V64, 248 TCG_TYPE_V128, 249 TCG_TYPE_V256, 250 251 /* Number of different types (integer not enum) */ 252 #define TCG_TYPE_COUNT (TCG_TYPE_V256 + 1) 253 254 /* An alias for the size of the host register. */ 255 #if TCG_TARGET_REG_BITS == 32 256 TCG_TYPE_REG = TCG_TYPE_I32, 257 #else 258 TCG_TYPE_REG = TCG_TYPE_I64, 259 #endif 260 261 /* An alias for the size of the native pointer. */ 262 #if UINTPTR_MAX == UINT32_MAX 263 TCG_TYPE_PTR = TCG_TYPE_I32, 264 #else 265 TCG_TYPE_PTR = TCG_TYPE_I64, 266 #endif 267 } TCGType; 268 269 /** 270 * tcg_type_size 271 * @t: type 272 * 273 * Return the size of the type in bytes. 274 */ 275 static inline int tcg_type_size(TCGType t) 276 { 277 unsigned i = t; 278 if (i >= TCG_TYPE_V64) { 279 tcg_debug_assert(i < TCG_TYPE_COUNT); 280 i -= TCG_TYPE_V64 - 1; 281 } 282 return 4 << i; 283 } 284 285 /** 286 * get_alignment_bits 287 * @memop: MemOp value 288 * 289 * Extract the alignment size from the memop. 290 */ 291 static inline unsigned get_alignment_bits(MemOp memop) 292 { 293 unsigned a = memop & MO_AMASK; 294 295 if (a == MO_UNALN) { 296 /* No alignment required. */ 297 a = 0; 298 } else if (a == MO_ALIGN) { 299 /* A natural alignment requirement. */ 300 a = memop & MO_SIZE; 301 } else { 302 /* A specific alignment requirement. */ 303 a = a >> MO_ASHIFT; 304 } 305 return a; 306 } 307 308 typedef tcg_target_ulong TCGArg; 309 310 /* Define type and accessor macros for TCG variables. 311 312 TCG variables are the inputs and outputs of TCG ops, as described 313 in tcg/README. Target CPU front-end code uses these types to deal 314 with TCG variables as it emits TCG code via the tcg_gen_* functions. 315 They come in several flavours: 316 * TCGv_i32 : 32 bit integer type 317 * TCGv_i64 : 64 bit integer type 318 * TCGv_i128 : 128 bit integer type 319 * TCGv_ptr : a host pointer type 320 * TCGv_vec : a host vector type; the exact size is not exposed 321 to the CPU front-end code. 322 * TCGv : an integer type the same size as target_ulong 323 (an alias for either TCGv_i32 or TCGv_i64) 324 The compiler's type checking will complain if you mix them 325 up and pass the wrong sized TCGv to a function. 326 327 Users of tcg_gen_* don't need to know about any of the internal 328 details of these, and should treat them as opaque types. 329 You won't be able to look inside them in a debugger either. 330 331 Internal implementation details follow: 332 333 Note that there is no definition of the structs TCGv_i32_d etc anywhere. 334 This is deliberate, because the values we store in variables of type 335 TCGv_i32 are not really pointers-to-structures. They're just small 336 integers, but keeping them in pointer types like this means that the 337 compiler will complain if you accidentally pass a TCGv_i32 to a 338 function which takes a TCGv_i64, and so on. Only the internals of 339 TCG need to care about the actual contents of the types. */ 340 341 typedef struct TCGv_i32_d *TCGv_i32; 342 typedef struct TCGv_i64_d *TCGv_i64; 343 typedef struct TCGv_i128_d *TCGv_i128; 344 typedef struct TCGv_ptr_d *TCGv_ptr; 345 typedef struct TCGv_vec_d *TCGv_vec; 346 typedef TCGv_ptr TCGv_env; 347 348 /* call flags */ 349 /* Helper does not read globals (either directly or through an exception). It 350 implies TCG_CALL_NO_WRITE_GLOBALS. */ 351 #define TCG_CALL_NO_READ_GLOBALS 0x0001 352 /* Helper does not write globals */ 353 #define TCG_CALL_NO_WRITE_GLOBALS 0x0002 354 /* Helper can be safely suppressed if the return value is not used. */ 355 #define TCG_CALL_NO_SIDE_EFFECTS 0x0004 356 /* Helper is G_NORETURN. */ 357 #define TCG_CALL_NO_RETURN 0x0008 358 /* Helper is part of Plugins. */ 359 #define TCG_CALL_PLUGIN 0x0010 360 361 /* convenience version of most used call flags */ 362 #define TCG_CALL_NO_RWG TCG_CALL_NO_READ_GLOBALS 363 #define TCG_CALL_NO_WG TCG_CALL_NO_WRITE_GLOBALS 364 #define TCG_CALL_NO_SE TCG_CALL_NO_SIDE_EFFECTS 365 #define TCG_CALL_NO_RWG_SE (TCG_CALL_NO_RWG | TCG_CALL_NO_SE) 366 #define TCG_CALL_NO_WG_SE (TCG_CALL_NO_WG | TCG_CALL_NO_SE) 367 368 /* 369 * Flags for the bswap opcodes. 370 * If IZ, the input is zero-extended, otherwise unknown. 371 * If OZ or OS, the output is zero- or sign-extended respectively, 372 * otherwise the high bits are undefined. 373 */ 374 enum { 375 TCG_BSWAP_IZ = 1, 376 TCG_BSWAP_OZ = 2, 377 TCG_BSWAP_OS = 4, 378 }; 379 380 typedef enum TCGTempVal { 381 TEMP_VAL_DEAD, 382 TEMP_VAL_REG, 383 TEMP_VAL_MEM, 384 TEMP_VAL_CONST, 385 } TCGTempVal; 386 387 typedef enum TCGTempKind { 388 /* 389 * Temp is dead at the end of the extended basic block (EBB), 390 * the single-entry multiple-exit region that falls through 391 * conditional branches. 392 */ 393 TEMP_EBB, 394 /* Temp is live across the entire translation block, but dead at end. */ 395 TEMP_TB, 396 /* Temp is live across the entire translation block, and between them. */ 397 TEMP_GLOBAL, 398 /* Temp is in a fixed register. */ 399 TEMP_FIXED, 400 /* Temp is a fixed constant. */ 401 TEMP_CONST, 402 } TCGTempKind; 403 404 typedef struct TCGTemp { 405 TCGReg reg:8; 406 TCGTempVal val_type:8; 407 TCGType base_type:8; 408 TCGType type:8; 409 TCGTempKind kind:3; 410 unsigned int indirect_reg:1; 411 unsigned int indirect_base:1; 412 unsigned int mem_coherent:1; 413 unsigned int mem_allocated:1; 414 unsigned int temp_allocated:1; 415 unsigned int temp_subindex:1; 416 417 int64_t val; 418 struct TCGTemp *mem_base; 419 intptr_t mem_offset; 420 const char *name; 421 422 /* Pass-specific information that can be stored for a temporary. 423 One word worth of integer data, and one pointer to data 424 allocated separately. */ 425 uintptr_t state; 426 void *state_ptr; 427 } TCGTemp; 428 429 typedef struct TCGContext TCGContext; 430 431 typedef struct TCGTempSet { 432 unsigned long l[BITS_TO_LONGS(TCG_MAX_TEMPS)]; 433 } TCGTempSet; 434 435 /* 436 * With 1 128-bit output, a 32-bit host requires 4 output parameters, 437 * which leaves a maximum of 28 other slots. Which is enough for 7 438 * 128-bit operands. 439 */ 440 #define DEAD_ARG (1 << 4) 441 #define SYNC_ARG (1 << 0) 442 typedef uint32_t TCGLifeData; 443 444 struct TCGOp { 445 TCGOpcode opc : 8; 446 unsigned nargs : 8; 447 448 /* Parameters for this opcode. See below. */ 449 unsigned param1 : 8; 450 unsigned param2 : 8; 451 452 /* Lifetime data of the operands. */ 453 TCGLifeData life; 454 455 /* Next and previous opcodes. */ 456 QTAILQ_ENTRY(TCGOp) link; 457 458 /* Register preferences for the output(s). */ 459 TCGRegSet output_pref[2]; 460 461 /* Arguments for the opcode. */ 462 TCGArg args[]; 463 }; 464 465 #define TCGOP_CALLI(X) (X)->param1 466 #define TCGOP_CALLO(X) (X)->param2 467 468 #define TCGOP_VECL(X) (X)->param1 469 #define TCGOP_VECE(X) (X)->param2 470 471 /* Make sure operands fit in the bitfields above. */ 472 QEMU_BUILD_BUG_ON(NB_OPS > (1 << 8)); 473 474 static inline TCGRegSet output_pref(const TCGOp *op, unsigned i) 475 { 476 return i < ARRAY_SIZE(op->output_pref) ? op->output_pref[i] : 0; 477 } 478 479 struct TCGContext { 480 uint8_t *pool_cur, *pool_end; 481 TCGPool *pool_first, *pool_current, *pool_first_large; 482 int nb_labels; 483 int nb_globals; 484 int nb_temps; 485 int nb_indirects; 486 int nb_ops; 487 TCGType addr_type; /* TCG_TYPE_I32 or TCG_TYPE_I64 */ 488 489 int page_mask; 490 uint8_t page_bits; 491 uint8_t tlb_dyn_max_bits; 492 uint8_t insn_start_words; 493 TCGBar guest_mo; 494 495 TCGRegSet reserved_regs; 496 intptr_t current_frame_offset; 497 intptr_t frame_start; 498 intptr_t frame_end; 499 TCGTemp *frame_temp; 500 501 TranslationBlock *gen_tb; /* tb for which code is being generated */ 502 tcg_insn_unit *code_buf; /* pointer for start of tb */ 503 tcg_insn_unit *code_ptr; /* pointer for running end of tb */ 504 505 #ifdef CONFIG_DEBUG_TCG 506 int goto_tb_issue_mask; 507 const TCGOpcode *vecop_list; 508 #endif 509 510 /* Code generation. Note that we specifically do not use tcg_insn_unit 511 here, because there's too much arithmetic throughout that relies 512 on addition and subtraction working on bytes. Rely on the GCC 513 extension that allows arithmetic on void*. */ 514 void *code_gen_buffer; 515 size_t code_gen_buffer_size; 516 void *code_gen_ptr; 517 void *data_gen_ptr; 518 519 /* Threshold to flush the translated code buffer. */ 520 void *code_gen_highwater; 521 522 /* Track which vCPU triggers events */ 523 CPUState *cpu; /* *_trans */ 524 525 /* These structures are private to tcg-target.c.inc. */ 526 #ifdef TCG_TARGET_NEED_LDST_LABELS 527 QSIMPLEQ_HEAD(, TCGLabelQemuLdst) ldst_labels; 528 #endif 529 #ifdef TCG_TARGET_NEED_POOL_LABELS 530 struct TCGLabelPoolData *pool_labels; 531 #endif 532 533 TCGLabel *exitreq_label; 534 535 #ifdef CONFIG_PLUGIN 536 /* 537 * We keep one plugin_tb struct per TCGContext. Note that on every TB 538 * translation we clear but do not free its contents; this way we 539 * avoid a lot of malloc/free churn, since after a few TB's it's 540 * unlikely that we'll need to allocate either more instructions or more 541 * space for instructions (for variable-instruction-length ISAs). 542 */ 543 struct qemu_plugin_tb *plugin_tb; 544 545 /* descriptor of the instruction being translated */ 546 struct qemu_plugin_insn *plugin_insn; 547 #endif 548 549 GHashTable *const_table[TCG_TYPE_COUNT]; 550 TCGTempSet free_temps[TCG_TYPE_COUNT]; 551 TCGTemp temps[TCG_MAX_TEMPS]; /* globals first, temps after */ 552 553 QTAILQ_HEAD(, TCGOp) ops, free_ops; 554 QSIMPLEQ_HEAD(, TCGLabel) labels; 555 556 /* Tells which temporary holds a given register. 557 It does not take into account fixed registers */ 558 TCGTemp *reg_to_temp[TCG_TARGET_NB_REGS]; 559 560 uint16_t gen_insn_end_off[TCG_MAX_INSNS]; 561 uint64_t *gen_insn_data; 562 563 /* Exit to translator on overflow. */ 564 sigjmp_buf jmp_trans; 565 }; 566 567 static inline bool temp_readonly(TCGTemp *ts) 568 { 569 return ts->kind >= TEMP_FIXED; 570 } 571 572 #ifdef CONFIG_USER_ONLY 573 extern bool tcg_use_softmmu; 574 #else 575 #define tcg_use_softmmu true 576 #endif 577 578 extern __thread TCGContext *tcg_ctx; 579 extern const void *tcg_code_gen_epilogue; 580 extern uintptr_t tcg_splitwx_diff; 581 extern TCGv_env tcg_env; 582 583 bool in_code_gen_buffer(const void *p); 584 585 #ifdef CONFIG_DEBUG_TCG 586 const void *tcg_splitwx_to_rx(void *rw); 587 void *tcg_splitwx_to_rw(const void *rx); 588 #else 589 static inline const void *tcg_splitwx_to_rx(void *rw) 590 { 591 return rw ? rw + tcg_splitwx_diff : NULL; 592 } 593 594 static inline void *tcg_splitwx_to_rw(const void *rx) 595 { 596 return rx ? (void *)rx - tcg_splitwx_diff : NULL; 597 } 598 #endif 599 600 static inline TCGArg temp_arg(TCGTemp *ts) 601 { 602 return (uintptr_t)ts; 603 } 604 605 static inline TCGTemp *arg_temp(TCGArg a) 606 { 607 return (TCGTemp *)(uintptr_t)a; 608 } 609 610 #ifdef CONFIG_DEBUG_TCG 611 size_t temp_idx(TCGTemp *ts); 612 TCGTemp *tcgv_i32_temp(TCGv_i32 v); 613 #else 614 static inline size_t temp_idx(TCGTemp *ts) 615 { 616 return ts - tcg_ctx->temps; 617 } 618 619 /* 620 * Using the offset of a temporary, relative to TCGContext, rather than 621 * its index means that we don't use 0. That leaves offset 0 free for 622 * a NULL representation without having to leave index 0 unused. 623 */ 624 static inline TCGTemp *tcgv_i32_temp(TCGv_i32 v) 625 { 626 return (void *)tcg_ctx + (uintptr_t)v; 627 } 628 #endif 629 630 static inline TCGTemp *tcgv_i64_temp(TCGv_i64 v) 631 { 632 return tcgv_i32_temp((TCGv_i32)v); 633 } 634 635 static inline TCGTemp *tcgv_i128_temp(TCGv_i128 v) 636 { 637 return tcgv_i32_temp((TCGv_i32)v); 638 } 639 640 static inline TCGTemp *tcgv_ptr_temp(TCGv_ptr v) 641 { 642 return tcgv_i32_temp((TCGv_i32)v); 643 } 644 645 static inline TCGTemp *tcgv_vec_temp(TCGv_vec v) 646 { 647 return tcgv_i32_temp((TCGv_i32)v); 648 } 649 650 static inline TCGArg tcgv_i32_arg(TCGv_i32 v) 651 { 652 return temp_arg(tcgv_i32_temp(v)); 653 } 654 655 static inline TCGArg tcgv_i64_arg(TCGv_i64 v) 656 { 657 return temp_arg(tcgv_i64_temp(v)); 658 } 659 660 static inline TCGArg tcgv_i128_arg(TCGv_i128 v) 661 { 662 return temp_arg(tcgv_i128_temp(v)); 663 } 664 665 static inline TCGArg tcgv_ptr_arg(TCGv_ptr v) 666 { 667 return temp_arg(tcgv_ptr_temp(v)); 668 } 669 670 static inline TCGArg tcgv_vec_arg(TCGv_vec v) 671 { 672 return temp_arg(tcgv_vec_temp(v)); 673 } 674 675 static inline TCGv_i32 temp_tcgv_i32(TCGTemp *t) 676 { 677 (void)temp_idx(t); /* trigger embedded assert */ 678 return (TCGv_i32)((void *)t - (void *)tcg_ctx); 679 } 680 681 static inline TCGv_i64 temp_tcgv_i64(TCGTemp *t) 682 { 683 return (TCGv_i64)temp_tcgv_i32(t); 684 } 685 686 static inline TCGv_i128 temp_tcgv_i128(TCGTemp *t) 687 { 688 return (TCGv_i128)temp_tcgv_i32(t); 689 } 690 691 static inline TCGv_ptr temp_tcgv_ptr(TCGTemp *t) 692 { 693 return (TCGv_ptr)temp_tcgv_i32(t); 694 } 695 696 static inline TCGv_vec temp_tcgv_vec(TCGTemp *t) 697 { 698 return (TCGv_vec)temp_tcgv_i32(t); 699 } 700 701 static inline TCGArg tcg_get_insn_param(TCGOp *op, int arg) 702 { 703 return op->args[arg]; 704 } 705 706 static inline void tcg_set_insn_param(TCGOp *op, int arg, TCGArg v) 707 { 708 op->args[arg] = v; 709 } 710 711 static inline uint64_t tcg_get_insn_start_param(TCGOp *op, int arg) 712 { 713 if (TCG_TARGET_REG_BITS == 64) { 714 return tcg_get_insn_param(op, arg); 715 } else { 716 return deposit64(tcg_get_insn_param(op, arg * 2), 32, 32, 717 tcg_get_insn_param(op, arg * 2 + 1)); 718 } 719 } 720 721 static inline void tcg_set_insn_start_param(TCGOp *op, int arg, uint64_t v) 722 { 723 if (TCG_TARGET_REG_BITS == 64) { 724 tcg_set_insn_param(op, arg, v); 725 } else { 726 tcg_set_insn_param(op, arg * 2, v); 727 tcg_set_insn_param(op, arg * 2 + 1, v >> 32); 728 } 729 } 730 731 /* The last op that was emitted. */ 732 static inline TCGOp *tcg_last_op(void) 733 { 734 return QTAILQ_LAST(&tcg_ctx->ops); 735 } 736 737 /* Test for whether to terminate the TB for using too many opcodes. */ 738 static inline bool tcg_op_buf_full(void) 739 { 740 /* This is not a hard limit, it merely stops translation when 741 * we have produced "enough" opcodes. We want to limit TB size 742 * such that a RISC host can reasonably use a 16-bit signed 743 * branch within the TB. We also need to be mindful of the 744 * 16-bit unsigned offsets, TranslationBlock.jmp_reset_offset[] 745 * and TCGContext.gen_insn_end_off[]. 746 */ 747 return tcg_ctx->nb_ops >= 4000; 748 } 749 750 /* pool based memory allocation */ 751 752 /* user-mode: mmap_lock must be held for tcg_malloc_internal. */ 753 void *tcg_malloc_internal(TCGContext *s, int size); 754 void tcg_pool_reset(TCGContext *s); 755 TranslationBlock *tcg_tb_alloc(TCGContext *s); 756 757 void tcg_region_reset_all(void); 758 759 size_t tcg_code_size(void); 760 size_t tcg_code_capacity(void); 761 762 void tcg_tb_insert(TranslationBlock *tb); 763 void tcg_tb_remove(TranslationBlock *tb); 764 TranslationBlock *tcg_tb_lookup(uintptr_t tc_ptr); 765 void tcg_tb_foreach(GTraverseFunc func, gpointer user_data); 766 size_t tcg_nb_tbs(void); 767 768 /* user-mode: Called with mmap_lock held. */ 769 static inline void *tcg_malloc(int size) 770 { 771 TCGContext *s = tcg_ctx; 772 uint8_t *ptr, *ptr_end; 773 774 /* ??? This is a weak placeholder for minimum malloc alignment. */ 775 size = QEMU_ALIGN_UP(size, 8); 776 777 ptr = s->pool_cur; 778 ptr_end = ptr + size; 779 if (unlikely(ptr_end > s->pool_end)) { 780 return tcg_malloc_internal(tcg_ctx, size); 781 } else { 782 s->pool_cur = ptr_end; 783 return ptr; 784 } 785 } 786 787 void tcg_func_start(TCGContext *s); 788 789 int tcg_gen_code(TCGContext *s, TranslationBlock *tb, uint64_t pc_start); 790 791 void tb_target_set_jmp_target(const TranslationBlock *, int, 792 uintptr_t, uintptr_t); 793 794 void tcg_set_frame(TCGContext *s, TCGReg reg, intptr_t start, intptr_t size); 795 796 #define TCG_CT_CONST 1 /* any constant of register size */ 797 798 typedef struct TCGArgConstraint { 799 unsigned ct : 16; 800 unsigned alias_index : 4; 801 unsigned sort_index : 4; 802 unsigned pair_index : 4; 803 unsigned pair : 2; /* 0: none, 1: first, 2: second, 3: second alias */ 804 bool oalias : 1; 805 bool ialias : 1; 806 bool newreg : 1; 807 TCGRegSet regs; 808 } TCGArgConstraint; 809 810 #define TCG_MAX_OP_ARGS 16 811 812 /* Bits for TCGOpDef->flags, 8 bits available, all used. */ 813 enum { 814 /* Instruction exits the translation block. */ 815 TCG_OPF_BB_EXIT = 0x01, 816 /* Instruction defines the end of a basic block. */ 817 TCG_OPF_BB_END = 0x02, 818 /* Instruction clobbers call registers and potentially update globals. */ 819 TCG_OPF_CALL_CLOBBER = 0x04, 820 /* Instruction has side effects: it cannot be removed if its outputs 821 are not used, and might trigger exceptions. */ 822 TCG_OPF_SIDE_EFFECTS = 0x08, 823 /* Instruction operands are 64-bits (otherwise 32-bits). */ 824 TCG_OPF_64BIT = 0x10, 825 /* Instruction is optional and not implemented by the host, or insn 826 is generic and should not be implemented by the host. */ 827 TCG_OPF_NOT_PRESENT = 0x20, 828 /* Instruction operands are vectors. */ 829 TCG_OPF_VECTOR = 0x40, 830 /* Instruction is a conditional branch. */ 831 TCG_OPF_COND_BRANCH = 0x80 832 }; 833 834 typedef struct TCGOpDef { 835 const char *name; 836 uint8_t nb_oargs, nb_iargs, nb_cargs, nb_args; 837 uint8_t flags; 838 TCGArgConstraint *args_ct; 839 } TCGOpDef; 840 841 extern TCGOpDef tcg_op_defs[]; 842 extern const size_t tcg_op_defs_max; 843 844 typedef struct TCGTargetOpDef { 845 TCGOpcode op; 846 const char *args_ct_str[TCG_MAX_OP_ARGS]; 847 } TCGTargetOpDef; 848 849 bool tcg_op_supported(TCGOpcode op); 850 851 void tcg_gen_call0(TCGHelperInfo *, TCGTemp *ret); 852 void tcg_gen_call1(TCGHelperInfo *, TCGTemp *ret, TCGTemp *); 853 void tcg_gen_call2(TCGHelperInfo *, TCGTemp *ret, TCGTemp *, TCGTemp *); 854 void tcg_gen_call3(TCGHelperInfo *, TCGTemp *ret, TCGTemp *, 855 TCGTemp *, TCGTemp *); 856 void tcg_gen_call4(TCGHelperInfo *, TCGTemp *ret, TCGTemp *, TCGTemp *, 857 TCGTemp *, TCGTemp *); 858 void tcg_gen_call5(TCGHelperInfo *, TCGTemp *ret, TCGTemp *, TCGTemp *, 859 TCGTemp *, TCGTemp *, TCGTemp *); 860 void tcg_gen_call6(TCGHelperInfo *, TCGTemp *ret, TCGTemp *, TCGTemp *, 861 TCGTemp *, TCGTemp *, TCGTemp *, TCGTemp *); 862 void tcg_gen_call7(TCGHelperInfo *, TCGTemp *ret, TCGTemp *, TCGTemp *, 863 TCGTemp *, TCGTemp *, TCGTemp *, TCGTemp *, TCGTemp *); 864 865 TCGOp *tcg_emit_op(TCGOpcode opc, unsigned nargs); 866 void tcg_op_remove(TCGContext *s, TCGOp *op); 867 TCGOp *tcg_op_insert_before(TCGContext *s, TCGOp *op, 868 TCGOpcode opc, unsigned nargs); 869 TCGOp *tcg_op_insert_after(TCGContext *s, TCGOp *op, 870 TCGOpcode opc, unsigned nargs); 871 872 /** 873 * tcg_remove_ops_after: 874 * @op: target operation 875 * 876 * Discard any opcodes emitted since @op. Expected usage is to save 877 * a starting point with tcg_last_op(), speculatively emit opcodes, 878 * then decide whether or not to keep those opcodes after the fact. 879 */ 880 void tcg_remove_ops_after(TCGOp *op); 881 882 void tcg_optimize(TCGContext *s); 883 884 TCGLabel *gen_new_label(void); 885 886 /** 887 * label_arg 888 * @l: label 889 * 890 * Encode a label for storage in the TCG opcode stream. 891 */ 892 893 static inline TCGArg label_arg(TCGLabel *l) 894 { 895 return (uintptr_t)l; 896 } 897 898 /** 899 * arg_label 900 * @i: value 901 * 902 * The opposite of label_arg. Retrieve a label from the 903 * encoding of the TCG opcode stream. 904 */ 905 906 static inline TCGLabel *arg_label(TCGArg i) 907 { 908 return (TCGLabel *)(uintptr_t)i; 909 } 910 911 /** 912 * tcg_ptr_byte_diff 913 * @a, @b: addresses to be differenced 914 * 915 * There are many places within the TCG backends where we need a byte 916 * difference between two pointers. While this can be accomplished 917 * with local casting, it's easy to get wrong -- especially if one is 918 * concerned with the signedness of the result. 919 * 920 * This version relies on GCC's void pointer arithmetic to get the 921 * correct result. 922 */ 923 924 static inline ptrdiff_t tcg_ptr_byte_diff(const void *a, const void *b) 925 { 926 return a - b; 927 } 928 929 /** 930 * tcg_pcrel_diff 931 * @s: the tcg context 932 * @target: address of the target 933 * 934 * Produce a pc-relative difference, from the current code_ptr 935 * to the destination address. 936 */ 937 938 static inline ptrdiff_t tcg_pcrel_diff(TCGContext *s, const void *target) 939 { 940 return tcg_ptr_byte_diff(target, tcg_splitwx_to_rx(s->code_ptr)); 941 } 942 943 /** 944 * tcg_tbrel_diff 945 * @s: the tcg context 946 * @target: address of the target 947 * 948 * Produce a difference, from the beginning of the current TB code 949 * to the destination address. 950 */ 951 static inline ptrdiff_t tcg_tbrel_diff(TCGContext *s, const void *target) 952 { 953 return tcg_ptr_byte_diff(target, tcg_splitwx_to_rx(s->code_buf)); 954 } 955 956 /** 957 * tcg_current_code_size 958 * @s: the tcg context 959 * 960 * Compute the current code size within the translation block. 961 * This is used to fill in qemu's data structures for goto_tb. 962 */ 963 964 static inline size_t tcg_current_code_size(TCGContext *s) 965 { 966 return tcg_ptr_byte_diff(s->code_ptr, s->code_buf); 967 } 968 969 /** 970 * tcg_qemu_tb_exec: 971 * @env: pointer to CPUArchState for the CPU 972 * @tb_ptr: address of generated code for the TB to execute 973 * 974 * Start executing code from a given translation block. 975 * Where translation blocks have been linked, execution 976 * may proceed from the given TB into successive ones. 977 * Control eventually returns only when some action is needed 978 * from the top-level loop: either control must pass to a TB 979 * which has not yet been directly linked, or an asynchronous 980 * event such as an interrupt needs handling. 981 * 982 * Return: The return value is the value passed to the corresponding 983 * tcg_gen_exit_tb() at translation time of the last TB attempted to execute. 984 * The value is either zero or a 4-byte aligned pointer to that TB combined 985 * with additional information in its two least significant bits. The 986 * additional information is encoded as follows: 987 * 0, 1: the link between this TB and the next is via the specified 988 * TB index (0 or 1). That is, we left the TB via (the equivalent 989 * of) "goto_tb <index>". The main loop uses this to determine 990 * how to link the TB just executed to the next. 991 * 2: we are using instruction counting code generation, and we 992 * did not start executing this TB because the instruction counter 993 * would hit zero midway through it. In this case the pointer 994 * returned is the TB we were about to execute, and the caller must 995 * arrange to execute the remaining count of instructions. 996 * 3: we stopped because the CPU's exit_request flag was set 997 * (usually meaning that there is an interrupt that needs to be 998 * handled). The pointer returned is the TB we were about to execute 999 * when we noticed the pending exit request. 1000 * 1001 * If the bottom two bits indicate an exit-via-index then the CPU 1002 * state is correctly synchronised and ready for execution of the next 1003 * TB (and in particular the guest PC is the address to execute next). 1004 * Otherwise, we gave up on execution of this TB before it started, and 1005 * the caller must fix up the CPU state by calling the CPU's 1006 * synchronize_from_tb() method with the TB pointer we return (falling 1007 * back to calling the CPU's set_pc method with tb->pb if no 1008 * synchronize_from_tb() method exists). 1009 * 1010 * Note that TCG targets may use a different definition of tcg_qemu_tb_exec 1011 * to this default (which just calls the prologue.code emitted by 1012 * tcg_target_qemu_prologue()). 1013 */ 1014 #define TB_EXIT_MASK 3 1015 #define TB_EXIT_IDX0 0 1016 #define TB_EXIT_IDX1 1 1017 #define TB_EXIT_IDXMAX 1 1018 #define TB_EXIT_REQUESTED 3 1019 1020 #ifdef CONFIG_TCG_INTERPRETER 1021 uintptr_t tcg_qemu_tb_exec(CPUArchState *env, const void *tb_ptr); 1022 #else 1023 typedef uintptr_t tcg_prologue_fn(CPUArchState *env, const void *tb_ptr); 1024 extern tcg_prologue_fn *tcg_qemu_tb_exec; 1025 #endif 1026 1027 void tcg_register_jit(const void *buf, size_t buf_size); 1028 1029 #if TCG_TARGET_MAYBE_vec 1030 /* Return zero if the tuple (opc, type, vece) is unsupportable; 1031 return > 0 if it is directly supportable; 1032 return < 0 if we must call tcg_expand_vec_op. */ 1033 int tcg_can_emit_vec_op(TCGOpcode, TCGType, unsigned); 1034 #else 1035 static inline int tcg_can_emit_vec_op(TCGOpcode o, TCGType t, unsigned ve) 1036 { 1037 return 0; 1038 } 1039 #endif 1040 1041 /* Expand the tuple (opc, type, vece) on the given arguments. */ 1042 void tcg_expand_vec_op(TCGOpcode, TCGType, unsigned, TCGArg, ...); 1043 1044 /* Replicate a constant C according to the log2 of the element size. */ 1045 uint64_t dup_const(unsigned vece, uint64_t c); 1046 1047 #define dup_const(VECE, C) \ 1048 (__builtin_constant_p(VECE) \ 1049 ? ( (VECE) == MO_8 ? 0x0101010101010101ull * (uint8_t)(C) \ 1050 : (VECE) == MO_16 ? 0x0001000100010001ull * (uint16_t)(C) \ 1051 : (VECE) == MO_32 ? 0x0000000100000001ull * (uint32_t)(C) \ 1052 : (VECE) == MO_64 ? (uint64_t)(C) \ 1053 : (qemu_build_not_reached_always(), 0)) \ 1054 : dup_const(VECE, C)) 1055 1056 static inline const TCGOpcode *tcg_swap_vecop_list(const TCGOpcode *n) 1057 { 1058 #ifdef CONFIG_DEBUG_TCG 1059 const TCGOpcode *o = tcg_ctx->vecop_list; 1060 tcg_ctx->vecop_list = n; 1061 return o; 1062 #else 1063 return NULL; 1064 #endif 1065 } 1066 1067 bool tcg_can_emit_vecop_list(const TCGOpcode *, TCGType, unsigned); 1068 1069 #endif /* TCG_H */ 1070