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 "cpu.h" 29 #include "exec/memop.h" 30 #include "exec/memopidx.h" 31 #include "qemu/bitops.h" 32 #include "qemu/plugin.h" 33 #include "qemu/queue.h" 34 #include "tcg/tcg-mo.h" 35 #include "tcg-target.h" 36 #include "tcg/tcg-cond.h" 37 38 /* XXX: make safe guess about sizes */ 39 #define MAX_OP_PER_INSTR 266 40 41 #define MAX_CALL_IARGS 7 42 43 #define CPU_TEMP_BUF_NLONGS 128 44 #define TCG_STATIC_FRAME_SIZE (CPU_TEMP_BUF_NLONGS * sizeof(long)) 45 46 /* Default target word size to pointer size. */ 47 #ifndef TCG_TARGET_REG_BITS 48 # if UINTPTR_MAX == UINT32_MAX 49 # define TCG_TARGET_REG_BITS 32 50 # elif UINTPTR_MAX == UINT64_MAX 51 # define TCG_TARGET_REG_BITS 64 52 # else 53 # error Unknown pointer size for tcg target 54 # endif 55 #endif 56 57 #if TCG_TARGET_REG_BITS == 32 58 typedef int32_t tcg_target_long; 59 typedef uint32_t tcg_target_ulong; 60 #define TCG_PRIlx PRIx32 61 #define TCG_PRIld PRId32 62 #elif TCG_TARGET_REG_BITS == 64 63 typedef int64_t tcg_target_long; 64 typedef uint64_t tcg_target_ulong; 65 #define TCG_PRIlx PRIx64 66 #define TCG_PRIld PRId64 67 #else 68 #error unsupported 69 #endif 70 71 /* Oversized TCG guests make things like MTTCG hard 72 * as we can't use atomics for cputlb updates. 73 */ 74 #if TARGET_LONG_BITS > TCG_TARGET_REG_BITS 75 #define TCG_OVERSIZED_GUEST 1 76 #else 77 #define TCG_OVERSIZED_GUEST 0 78 #endif 79 80 #if TCG_TARGET_NB_REGS <= 32 81 typedef uint32_t TCGRegSet; 82 #elif TCG_TARGET_NB_REGS <= 64 83 typedef uint64_t TCGRegSet; 84 #else 85 #error unsupported 86 #endif 87 88 #if TCG_TARGET_REG_BITS == 32 89 /* Turn some undef macros into false macros. */ 90 #define TCG_TARGET_HAS_extrl_i64_i32 0 91 #define TCG_TARGET_HAS_extrh_i64_i32 0 92 #define TCG_TARGET_HAS_div_i64 0 93 #define TCG_TARGET_HAS_rem_i64 0 94 #define TCG_TARGET_HAS_div2_i64 0 95 #define TCG_TARGET_HAS_rot_i64 0 96 #define TCG_TARGET_HAS_ext8s_i64 0 97 #define TCG_TARGET_HAS_ext16s_i64 0 98 #define TCG_TARGET_HAS_ext32s_i64 0 99 #define TCG_TARGET_HAS_ext8u_i64 0 100 #define TCG_TARGET_HAS_ext16u_i64 0 101 #define TCG_TARGET_HAS_ext32u_i64 0 102 #define TCG_TARGET_HAS_bswap16_i64 0 103 #define TCG_TARGET_HAS_bswap32_i64 0 104 #define TCG_TARGET_HAS_bswap64_i64 0 105 #define TCG_TARGET_HAS_neg_i64 0 106 #define TCG_TARGET_HAS_not_i64 0 107 #define TCG_TARGET_HAS_andc_i64 0 108 #define TCG_TARGET_HAS_orc_i64 0 109 #define TCG_TARGET_HAS_eqv_i64 0 110 #define TCG_TARGET_HAS_nand_i64 0 111 #define TCG_TARGET_HAS_nor_i64 0 112 #define TCG_TARGET_HAS_clz_i64 0 113 #define TCG_TARGET_HAS_ctz_i64 0 114 #define TCG_TARGET_HAS_ctpop_i64 0 115 #define TCG_TARGET_HAS_deposit_i64 0 116 #define TCG_TARGET_HAS_extract_i64 0 117 #define TCG_TARGET_HAS_sextract_i64 0 118 #define TCG_TARGET_HAS_extract2_i64 0 119 #define TCG_TARGET_HAS_movcond_i64 0 120 #define TCG_TARGET_HAS_add2_i64 0 121 #define TCG_TARGET_HAS_sub2_i64 0 122 #define TCG_TARGET_HAS_mulu2_i64 0 123 #define TCG_TARGET_HAS_muls2_i64 0 124 #define TCG_TARGET_HAS_muluh_i64 0 125 #define TCG_TARGET_HAS_mulsh_i64 0 126 /* Turn some undef macros into true macros. */ 127 #define TCG_TARGET_HAS_add2_i32 1 128 #define TCG_TARGET_HAS_sub2_i32 1 129 #endif 130 131 #ifndef TCG_TARGET_deposit_i32_valid 132 #define TCG_TARGET_deposit_i32_valid(ofs, len) 1 133 #endif 134 #ifndef TCG_TARGET_deposit_i64_valid 135 #define TCG_TARGET_deposit_i64_valid(ofs, len) 1 136 #endif 137 #ifndef TCG_TARGET_extract_i32_valid 138 #define TCG_TARGET_extract_i32_valid(ofs, len) 1 139 #endif 140 #ifndef TCG_TARGET_extract_i64_valid 141 #define TCG_TARGET_extract_i64_valid(ofs, len) 1 142 #endif 143 144 /* Only one of DIV or DIV2 should be defined. */ 145 #if defined(TCG_TARGET_HAS_div_i32) 146 #define TCG_TARGET_HAS_div2_i32 0 147 #elif defined(TCG_TARGET_HAS_div2_i32) 148 #define TCG_TARGET_HAS_div_i32 0 149 #define TCG_TARGET_HAS_rem_i32 0 150 #endif 151 #if defined(TCG_TARGET_HAS_div_i64) 152 #define TCG_TARGET_HAS_div2_i64 0 153 #elif defined(TCG_TARGET_HAS_div2_i64) 154 #define TCG_TARGET_HAS_div_i64 0 155 #define TCG_TARGET_HAS_rem_i64 0 156 #endif 157 158 #if !defined(TCG_TARGET_HAS_v64) \ 159 && !defined(TCG_TARGET_HAS_v128) \ 160 && !defined(TCG_TARGET_HAS_v256) 161 #define TCG_TARGET_MAYBE_vec 0 162 #define TCG_TARGET_HAS_abs_vec 0 163 #define TCG_TARGET_HAS_neg_vec 0 164 #define TCG_TARGET_HAS_not_vec 0 165 #define TCG_TARGET_HAS_andc_vec 0 166 #define TCG_TARGET_HAS_orc_vec 0 167 #define TCG_TARGET_HAS_nand_vec 0 168 #define TCG_TARGET_HAS_nor_vec 0 169 #define TCG_TARGET_HAS_eqv_vec 0 170 #define TCG_TARGET_HAS_roti_vec 0 171 #define TCG_TARGET_HAS_rots_vec 0 172 #define TCG_TARGET_HAS_rotv_vec 0 173 #define TCG_TARGET_HAS_shi_vec 0 174 #define TCG_TARGET_HAS_shs_vec 0 175 #define TCG_TARGET_HAS_shv_vec 0 176 #define TCG_TARGET_HAS_mul_vec 0 177 #define TCG_TARGET_HAS_sat_vec 0 178 #define TCG_TARGET_HAS_minmax_vec 0 179 #define TCG_TARGET_HAS_bitsel_vec 0 180 #define TCG_TARGET_HAS_cmpsel_vec 0 181 #else 182 #define TCG_TARGET_MAYBE_vec 1 183 #endif 184 #ifndef TCG_TARGET_HAS_v64 185 #define TCG_TARGET_HAS_v64 0 186 #endif 187 #ifndef TCG_TARGET_HAS_v128 188 #define TCG_TARGET_HAS_v128 0 189 #endif 190 #ifndef TCG_TARGET_HAS_v256 191 #define TCG_TARGET_HAS_v256 0 192 #endif 193 194 #ifndef TARGET_INSN_START_EXTRA_WORDS 195 # define TARGET_INSN_START_WORDS 1 196 #else 197 # define TARGET_INSN_START_WORDS (1 + TARGET_INSN_START_EXTRA_WORDS) 198 #endif 199 200 typedef enum TCGOpcode { 201 #define DEF(name, oargs, iargs, cargs, flags) INDEX_op_ ## name, 202 #include "tcg/tcg-opc.h" 203 #undef DEF 204 NB_OPS, 205 } TCGOpcode; 206 207 #define tcg_regset_set_reg(d, r) ((d) |= (TCGRegSet)1 << (r)) 208 #define tcg_regset_reset_reg(d, r) ((d) &= ~((TCGRegSet)1 << (r))) 209 #define tcg_regset_test_reg(d, r) (((d) >> (r)) & 1) 210 211 #ifndef TCG_TARGET_INSN_UNIT_SIZE 212 # error "Missing TCG_TARGET_INSN_UNIT_SIZE" 213 #elif TCG_TARGET_INSN_UNIT_SIZE == 1 214 typedef uint8_t tcg_insn_unit; 215 #elif TCG_TARGET_INSN_UNIT_SIZE == 2 216 typedef uint16_t tcg_insn_unit; 217 #elif TCG_TARGET_INSN_UNIT_SIZE == 4 218 typedef uint32_t tcg_insn_unit; 219 #elif TCG_TARGET_INSN_UNIT_SIZE == 8 220 typedef uint64_t tcg_insn_unit; 221 #else 222 /* The port better have done this. */ 223 #endif 224 225 226 #if defined CONFIG_DEBUG_TCG || defined QEMU_STATIC_ANALYSIS 227 # define tcg_debug_assert(X) do { assert(X); } while (0) 228 #else 229 # define tcg_debug_assert(X) \ 230 do { if (!(X)) { __builtin_unreachable(); } } while (0) 231 #endif 232 233 typedef struct TCGRelocation TCGRelocation; 234 struct TCGRelocation { 235 QSIMPLEQ_ENTRY(TCGRelocation) next; 236 tcg_insn_unit *ptr; 237 intptr_t addend; 238 int type; 239 }; 240 241 typedef struct TCGLabel TCGLabel; 242 struct TCGLabel { 243 unsigned present : 1; 244 unsigned has_value : 1; 245 unsigned id : 14; 246 unsigned refs : 16; 247 union { 248 uintptr_t value; 249 const tcg_insn_unit *value_ptr; 250 } u; 251 QSIMPLEQ_HEAD(, TCGRelocation) relocs; 252 QSIMPLEQ_ENTRY(TCGLabel) next; 253 }; 254 255 typedef struct TCGPool { 256 struct TCGPool *next; 257 int size; 258 uint8_t data[] __attribute__ ((aligned)); 259 } TCGPool; 260 261 #define TCG_POOL_CHUNK_SIZE 32768 262 263 #define TCG_MAX_TEMPS 512 264 #define TCG_MAX_INSNS 512 265 266 /* when the size of the arguments of a called function is smaller than 267 this value, they are statically allocated in the TB stack frame */ 268 #define TCG_STATIC_CALL_ARGS_SIZE 128 269 270 typedef enum TCGType { 271 TCG_TYPE_I32, 272 TCG_TYPE_I64, 273 TCG_TYPE_I128, 274 275 TCG_TYPE_V64, 276 TCG_TYPE_V128, 277 TCG_TYPE_V256, 278 279 /* Number of different types (integer not enum) */ 280 #define TCG_TYPE_COUNT (TCG_TYPE_V256 + 1) 281 282 /* An alias for the size of the host register. */ 283 #if TCG_TARGET_REG_BITS == 32 284 TCG_TYPE_REG = TCG_TYPE_I32, 285 #else 286 TCG_TYPE_REG = TCG_TYPE_I64, 287 #endif 288 289 /* An alias for the size of the native pointer. */ 290 #if UINTPTR_MAX == UINT32_MAX 291 TCG_TYPE_PTR = TCG_TYPE_I32, 292 #else 293 TCG_TYPE_PTR = TCG_TYPE_I64, 294 #endif 295 296 /* An alias for the size of the target "long", aka register. */ 297 #if TARGET_LONG_BITS == 64 298 TCG_TYPE_TL = TCG_TYPE_I64, 299 #else 300 TCG_TYPE_TL = TCG_TYPE_I32, 301 #endif 302 } TCGType; 303 304 /** 305 * tcg_type_size 306 * @t: type 307 * 308 * Return the size of the type in bytes. 309 */ 310 static inline int tcg_type_size(TCGType t) 311 { 312 unsigned i = t; 313 if (i >= TCG_TYPE_V64) { 314 tcg_debug_assert(i < TCG_TYPE_COUNT); 315 i -= TCG_TYPE_V64 - 1; 316 } 317 return 4 << i; 318 } 319 320 /** 321 * get_alignment_bits 322 * @memop: MemOp value 323 * 324 * Extract the alignment size from the memop. 325 */ 326 static inline unsigned get_alignment_bits(MemOp memop) 327 { 328 unsigned a = memop & MO_AMASK; 329 330 if (a == MO_UNALN) { 331 /* No alignment required. */ 332 a = 0; 333 } else if (a == MO_ALIGN) { 334 /* A natural alignment requirement. */ 335 a = memop & MO_SIZE; 336 } else { 337 /* A specific alignment requirement. */ 338 a = a >> MO_ASHIFT; 339 } 340 #if defined(CONFIG_SOFTMMU) 341 /* The requested alignment cannot overlap the TLB flags. */ 342 tcg_debug_assert((TLB_FLAGS_MASK & ((1 << a) - 1)) == 0); 343 #endif 344 return a; 345 } 346 347 typedef tcg_target_ulong TCGArg; 348 349 /* Define type and accessor macros for TCG variables. 350 351 TCG variables are the inputs and outputs of TCG ops, as described 352 in tcg/README. Target CPU front-end code uses these types to deal 353 with TCG variables as it emits TCG code via the tcg_gen_* functions. 354 They come in several flavours: 355 * TCGv_i32 : 32 bit integer type 356 * TCGv_i64 : 64 bit integer type 357 * TCGv_i128 : 128 bit integer type 358 * TCGv_ptr : a host pointer type 359 * TCGv_vec : a host vector type; the exact size is not exposed 360 to the CPU front-end code. 361 * TCGv : an integer type the same size as target_ulong 362 (an alias for either TCGv_i32 or TCGv_i64) 363 The compiler's type checking will complain if you mix them 364 up and pass the wrong sized TCGv to a function. 365 366 Users of tcg_gen_* don't need to know about any of the internal 367 details of these, and should treat them as opaque types. 368 You won't be able to look inside them in a debugger either. 369 370 Internal implementation details follow: 371 372 Note that there is no definition of the structs TCGv_i32_d etc anywhere. 373 This is deliberate, because the values we store in variables of type 374 TCGv_i32 are not really pointers-to-structures. They're just small 375 integers, but keeping them in pointer types like this means that the 376 compiler will complain if you accidentally pass a TCGv_i32 to a 377 function which takes a TCGv_i64, and so on. Only the internals of 378 TCG need to care about the actual contents of the types. */ 379 380 typedef struct TCGv_i32_d *TCGv_i32; 381 typedef struct TCGv_i64_d *TCGv_i64; 382 typedef struct TCGv_i128_d *TCGv_i128; 383 typedef struct TCGv_ptr_d *TCGv_ptr; 384 typedef struct TCGv_vec_d *TCGv_vec; 385 typedef TCGv_ptr TCGv_env; 386 #if TARGET_LONG_BITS == 32 387 #define TCGv TCGv_i32 388 #elif TARGET_LONG_BITS == 64 389 #define TCGv TCGv_i64 390 #else 391 #error Unhandled TARGET_LONG_BITS value 392 #endif 393 394 /* call flags */ 395 /* Helper does not read globals (either directly or through an exception). It 396 implies TCG_CALL_NO_WRITE_GLOBALS. */ 397 #define TCG_CALL_NO_READ_GLOBALS 0x0001 398 /* Helper does not write globals */ 399 #define TCG_CALL_NO_WRITE_GLOBALS 0x0002 400 /* Helper can be safely suppressed if the return value is not used. */ 401 #define TCG_CALL_NO_SIDE_EFFECTS 0x0004 402 /* Helper is G_NORETURN. */ 403 #define TCG_CALL_NO_RETURN 0x0008 404 /* Helper is part of Plugins. */ 405 #define TCG_CALL_PLUGIN 0x0010 406 407 /* convenience version of most used call flags */ 408 #define TCG_CALL_NO_RWG TCG_CALL_NO_READ_GLOBALS 409 #define TCG_CALL_NO_WG TCG_CALL_NO_WRITE_GLOBALS 410 #define TCG_CALL_NO_SE TCG_CALL_NO_SIDE_EFFECTS 411 #define TCG_CALL_NO_RWG_SE (TCG_CALL_NO_RWG | TCG_CALL_NO_SE) 412 #define TCG_CALL_NO_WG_SE (TCG_CALL_NO_WG | TCG_CALL_NO_SE) 413 414 /* 415 * Flags for the bswap opcodes. 416 * If IZ, the input is zero-extended, otherwise unknown. 417 * If OZ or OS, the output is zero- or sign-extended respectively, 418 * otherwise the high bits are undefined. 419 */ 420 enum { 421 TCG_BSWAP_IZ = 1, 422 TCG_BSWAP_OZ = 2, 423 TCG_BSWAP_OS = 4, 424 }; 425 426 typedef enum TCGTempVal { 427 TEMP_VAL_DEAD, 428 TEMP_VAL_REG, 429 TEMP_VAL_MEM, 430 TEMP_VAL_CONST, 431 } TCGTempVal; 432 433 typedef enum TCGTempKind { 434 /* 435 * Temp is dead at the end of the extended basic block (EBB), 436 * the single-entry multiple-exit region that falls through 437 * conditional branches. 438 */ 439 TEMP_EBB, 440 /* Temp is live across the entire translation block, but dead at end. */ 441 TEMP_TB, 442 /* Temp is live across the entire translation block, and between them. */ 443 TEMP_GLOBAL, 444 /* Temp is in a fixed register. */ 445 TEMP_FIXED, 446 /* Temp is a fixed constant. */ 447 TEMP_CONST, 448 } TCGTempKind; 449 450 typedef struct TCGTemp { 451 TCGReg reg:8; 452 TCGTempVal val_type:8; 453 TCGType base_type:8; 454 TCGType type:8; 455 TCGTempKind kind:3; 456 unsigned int indirect_reg:1; 457 unsigned int indirect_base:1; 458 unsigned int mem_coherent:1; 459 unsigned int mem_allocated:1; 460 unsigned int temp_allocated:1; 461 unsigned int temp_subindex:1; 462 463 int64_t val; 464 struct TCGTemp *mem_base; 465 intptr_t mem_offset; 466 const char *name; 467 468 /* Pass-specific information that can be stored for a temporary. 469 One word worth of integer data, and one pointer to data 470 allocated separately. */ 471 uintptr_t state; 472 void *state_ptr; 473 } TCGTemp; 474 475 typedef struct TCGContext TCGContext; 476 477 typedef struct TCGTempSet { 478 unsigned long l[BITS_TO_LONGS(TCG_MAX_TEMPS)]; 479 } TCGTempSet; 480 481 /* 482 * With 1 128-bit output, a 32-bit host requires 4 output parameters, 483 * which leaves a maximum of 28 other slots. Which is enough for 7 484 * 128-bit operands. 485 */ 486 #define DEAD_ARG (1 << 4) 487 #define SYNC_ARG (1 << 0) 488 typedef uint32_t TCGLifeData; 489 490 typedef struct TCGOp { 491 TCGOpcode opc : 8; 492 unsigned nargs : 8; 493 494 /* Parameters for this opcode. See below. */ 495 unsigned param1 : 8; 496 unsigned param2 : 8; 497 498 /* Lifetime data of the operands. */ 499 TCGLifeData life; 500 501 /* Next and previous opcodes. */ 502 QTAILQ_ENTRY(TCGOp) link; 503 504 /* Register preferences for the output(s). */ 505 TCGRegSet output_pref[2]; 506 507 /* Arguments for the opcode. */ 508 TCGArg args[]; 509 } TCGOp; 510 511 #define TCGOP_CALLI(X) (X)->param1 512 #define TCGOP_CALLO(X) (X)->param2 513 514 #define TCGOP_VECL(X) (X)->param1 515 #define TCGOP_VECE(X) (X)->param2 516 517 /* Make sure operands fit in the bitfields above. */ 518 QEMU_BUILD_BUG_ON(NB_OPS > (1 << 8)); 519 520 static inline TCGRegSet output_pref(const TCGOp *op, unsigned i) 521 { 522 return i < ARRAY_SIZE(op->output_pref) ? op->output_pref[i] : 0; 523 } 524 525 typedef struct TCGProfile { 526 int64_t cpu_exec_time; 527 int64_t tb_count1; 528 int64_t tb_count; 529 int64_t op_count; /* total insn count */ 530 int op_count_max; /* max insn per TB */ 531 int temp_count_max; 532 int64_t temp_count; 533 int64_t del_op_count; 534 int64_t code_in_len; 535 int64_t code_out_len; 536 int64_t search_out_len; 537 int64_t interm_time; 538 int64_t code_time; 539 int64_t la_time; 540 int64_t opt_time; 541 int64_t restore_count; 542 int64_t restore_time; 543 int64_t table_op_count[NB_OPS]; 544 } TCGProfile; 545 546 struct TCGContext { 547 uint8_t *pool_cur, *pool_end; 548 TCGPool *pool_first, *pool_current, *pool_first_large; 549 int nb_labels; 550 int nb_globals; 551 int nb_temps; 552 int nb_indirects; 553 int nb_ops; 554 555 TCGRegSet reserved_regs; 556 intptr_t current_frame_offset; 557 intptr_t frame_start; 558 intptr_t frame_end; 559 TCGTemp *frame_temp; 560 561 TranslationBlock *gen_tb; /* tb for which code is being generated */ 562 tcg_insn_unit *code_buf; /* pointer for start of tb */ 563 tcg_insn_unit *code_ptr; /* pointer for running end of tb */ 564 565 #ifdef CONFIG_PROFILER 566 TCGProfile prof; 567 #endif 568 569 #ifdef CONFIG_DEBUG_TCG 570 int temps_in_use; 571 int goto_tb_issue_mask; 572 const TCGOpcode *vecop_list; 573 #endif 574 575 /* Code generation. Note that we specifically do not use tcg_insn_unit 576 here, because there's too much arithmetic throughout that relies 577 on addition and subtraction working on bytes. Rely on the GCC 578 extension that allows arithmetic on void*. */ 579 void *code_gen_buffer; 580 size_t code_gen_buffer_size; 581 void *code_gen_ptr; 582 void *data_gen_ptr; 583 584 /* Threshold to flush the translated code buffer. */ 585 void *code_gen_highwater; 586 587 /* Track which vCPU triggers events */ 588 CPUState *cpu; /* *_trans */ 589 590 /* These structures are private to tcg-target.c.inc. */ 591 #ifdef TCG_TARGET_NEED_LDST_LABELS 592 QSIMPLEQ_HEAD(, TCGLabelQemuLdst) ldst_labels; 593 #endif 594 #ifdef TCG_TARGET_NEED_POOL_LABELS 595 struct TCGLabelPoolData *pool_labels; 596 #endif 597 598 TCGLabel *exitreq_label; 599 600 #ifdef CONFIG_PLUGIN 601 /* 602 * We keep one plugin_tb struct per TCGContext. Note that on every TB 603 * translation we clear but do not free its contents; this way we 604 * avoid a lot of malloc/free churn, since after a few TB's it's 605 * unlikely that we'll need to allocate either more instructions or more 606 * space for instructions (for variable-instruction-length ISAs). 607 */ 608 struct qemu_plugin_tb *plugin_tb; 609 610 /* descriptor of the instruction being translated */ 611 struct qemu_plugin_insn *plugin_insn; 612 #endif 613 614 GHashTable *const_table[TCG_TYPE_COUNT]; 615 TCGTempSet free_temps[TCG_TYPE_COUNT]; 616 TCGTemp temps[TCG_MAX_TEMPS]; /* globals first, temps after */ 617 618 QTAILQ_HEAD(, TCGOp) ops, free_ops; 619 QSIMPLEQ_HEAD(, TCGLabel) labels; 620 621 /* Tells which temporary holds a given register. 622 It does not take into account fixed registers */ 623 TCGTemp *reg_to_temp[TCG_TARGET_NB_REGS]; 624 625 uint16_t gen_insn_end_off[TCG_MAX_INSNS]; 626 target_ulong gen_insn_data[TCG_MAX_INSNS][TARGET_INSN_START_WORDS]; 627 628 /* Exit to translator on overflow. */ 629 sigjmp_buf jmp_trans; 630 }; 631 632 static inline bool temp_readonly(TCGTemp *ts) 633 { 634 return ts->kind >= TEMP_FIXED; 635 } 636 637 extern __thread TCGContext *tcg_ctx; 638 extern const void *tcg_code_gen_epilogue; 639 extern uintptr_t tcg_splitwx_diff; 640 extern TCGv_env cpu_env; 641 642 bool in_code_gen_buffer(const void *p); 643 644 #ifdef CONFIG_DEBUG_TCG 645 const void *tcg_splitwx_to_rx(void *rw); 646 void *tcg_splitwx_to_rw(const void *rx); 647 #else 648 static inline const void *tcg_splitwx_to_rx(void *rw) 649 { 650 return rw ? rw + tcg_splitwx_diff : NULL; 651 } 652 653 static inline void *tcg_splitwx_to_rw(const void *rx) 654 { 655 return rx ? (void *)rx - tcg_splitwx_diff : NULL; 656 } 657 #endif 658 659 static inline size_t temp_idx(TCGTemp *ts) 660 { 661 ptrdiff_t n = ts - tcg_ctx->temps; 662 tcg_debug_assert(n >= 0 && n < tcg_ctx->nb_temps); 663 return n; 664 } 665 666 static inline TCGArg temp_arg(TCGTemp *ts) 667 { 668 return (uintptr_t)ts; 669 } 670 671 static inline TCGTemp *arg_temp(TCGArg a) 672 { 673 return (TCGTemp *)(uintptr_t)a; 674 } 675 676 /* Using the offset of a temporary, relative to TCGContext, rather than 677 its index means that we don't use 0. That leaves offset 0 free for 678 a NULL representation without having to leave index 0 unused. */ 679 static inline TCGTemp *tcgv_i32_temp(TCGv_i32 v) 680 { 681 uintptr_t o = (uintptr_t)v; 682 TCGTemp *t = (void *)tcg_ctx + o; 683 tcg_debug_assert(offsetof(TCGContext, temps[temp_idx(t)]) == o); 684 return t; 685 } 686 687 static inline TCGTemp *tcgv_i64_temp(TCGv_i64 v) 688 { 689 return tcgv_i32_temp((TCGv_i32)v); 690 } 691 692 static inline TCGTemp *tcgv_i128_temp(TCGv_i128 v) 693 { 694 return tcgv_i32_temp((TCGv_i32)v); 695 } 696 697 static inline TCGTemp *tcgv_ptr_temp(TCGv_ptr v) 698 { 699 return tcgv_i32_temp((TCGv_i32)v); 700 } 701 702 static inline TCGTemp *tcgv_vec_temp(TCGv_vec v) 703 { 704 return tcgv_i32_temp((TCGv_i32)v); 705 } 706 707 static inline TCGArg tcgv_i32_arg(TCGv_i32 v) 708 { 709 return temp_arg(tcgv_i32_temp(v)); 710 } 711 712 static inline TCGArg tcgv_i64_arg(TCGv_i64 v) 713 { 714 return temp_arg(tcgv_i64_temp(v)); 715 } 716 717 static inline TCGArg tcgv_i128_arg(TCGv_i128 v) 718 { 719 return temp_arg(tcgv_i128_temp(v)); 720 } 721 722 static inline TCGArg tcgv_ptr_arg(TCGv_ptr v) 723 { 724 return temp_arg(tcgv_ptr_temp(v)); 725 } 726 727 static inline TCGArg tcgv_vec_arg(TCGv_vec v) 728 { 729 return temp_arg(tcgv_vec_temp(v)); 730 } 731 732 static inline TCGv_i32 temp_tcgv_i32(TCGTemp *t) 733 { 734 (void)temp_idx(t); /* trigger embedded assert */ 735 return (TCGv_i32)((void *)t - (void *)tcg_ctx); 736 } 737 738 static inline TCGv_i64 temp_tcgv_i64(TCGTemp *t) 739 { 740 return (TCGv_i64)temp_tcgv_i32(t); 741 } 742 743 static inline TCGv_i128 temp_tcgv_i128(TCGTemp *t) 744 { 745 return (TCGv_i128)temp_tcgv_i32(t); 746 } 747 748 static inline TCGv_ptr temp_tcgv_ptr(TCGTemp *t) 749 { 750 return (TCGv_ptr)temp_tcgv_i32(t); 751 } 752 753 static inline TCGv_vec temp_tcgv_vec(TCGTemp *t) 754 { 755 return (TCGv_vec)temp_tcgv_i32(t); 756 } 757 758 static inline TCGArg tcg_get_insn_param(TCGOp *op, int arg) 759 { 760 return op->args[arg]; 761 } 762 763 static inline void tcg_set_insn_param(TCGOp *op, int arg, TCGArg v) 764 { 765 op->args[arg] = v; 766 } 767 768 static inline target_ulong tcg_get_insn_start_param(TCGOp *op, int arg) 769 { 770 #if TARGET_LONG_BITS <= TCG_TARGET_REG_BITS 771 return tcg_get_insn_param(op, arg); 772 #else 773 return tcg_get_insn_param(op, arg * 2) | 774 ((uint64_t)tcg_get_insn_param(op, arg * 2 + 1) << 32); 775 #endif 776 } 777 778 static inline void tcg_set_insn_start_param(TCGOp *op, int arg, target_ulong v) 779 { 780 #if TARGET_LONG_BITS <= TCG_TARGET_REG_BITS 781 tcg_set_insn_param(op, arg, v); 782 #else 783 tcg_set_insn_param(op, arg * 2, v); 784 tcg_set_insn_param(op, arg * 2 + 1, v >> 32); 785 #endif 786 } 787 788 /* The last op that was emitted. */ 789 static inline TCGOp *tcg_last_op(void) 790 { 791 return QTAILQ_LAST(&tcg_ctx->ops); 792 } 793 794 /* Test for whether to terminate the TB for using too many opcodes. */ 795 static inline bool tcg_op_buf_full(void) 796 { 797 /* This is not a hard limit, it merely stops translation when 798 * we have produced "enough" opcodes. We want to limit TB size 799 * such that a RISC host can reasonably use a 16-bit signed 800 * branch within the TB. We also need to be mindful of the 801 * 16-bit unsigned offsets, TranslationBlock.jmp_reset_offset[] 802 * and TCGContext.gen_insn_end_off[]. 803 */ 804 return tcg_ctx->nb_ops >= 4000; 805 } 806 807 /* pool based memory allocation */ 808 809 /* user-mode: mmap_lock must be held for tcg_malloc_internal. */ 810 void *tcg_malloc_internal(TCGContext *s, int size); 811 void tcg_pool_reset(TCGContext *s); 812 TranslationBlock *tcg_tb_alloc(TCGContext *s); 813 814 void tcg_region_reset_all(void); 815 816 size_t tcg_code_size(void); 817 size_t tcg_code_capacity(void); 818 819 void tcg_tb_insert(TranslationBlock *tb); 820 void tcg_tb_remove(TranslationBlock *tb); 821 TranslationBlock *tcg_tb_lookup(uintptr_t tc_ptr); 822 void tcg_tb_foreach(GTraverseFunc func, gpointer user_data); 823 size_t tcg_nb_tbs(void); 824 825 /* user-mode: Called with mmap_lock held. */ 826 static inline void *tcg_malloc(int size) 827 { 828 TCGContext *s = tcg_ctx; 829 uint8_t *ptr, *ptr_end; 830 831 /* ??? This is a weak placeholder for minimum malloc alignment. */ 832 size = QEMU_ALIGN_UP(size, 8); 833 834 ptr = s->pool_cur; 835 ptr_end = ptr + size; 836 if (unlikely(ptr_end > s->pool_end)) { 837 return tcg_malloc_internal(tcg_ctx, size); 838 } else { 839 s->pool_cur = ptr_end; 840 return ptr; 841 } 842 } 843 844 void tcg_init(size_t tb_size, int splitwx, unsigned max_cpus); 845 void tcg_register_thread(void); 846 void tcg_prologue_init(TCGContext *s); 847 void tcg_func_start(TCGContext *s); 848 849 int tcg_gen_code(TCGContext *s, TranslationBlock *tb, target_ulong pc_start); 850 851 void tb_target_set_jmp_target(const TranslationBlock *, int, 852 uintptr_t, uintptr_t); 853 854 void tcg_set_frame(TCGContext *s, TCGReg reg, intptr_t start, intptr_t size); 855 856 TCGTemp *tcg_global_mem_new_internal(TCGType, TCGv_ptr, 857 intptr_t, const char *); 858 TCGTemp *tcg_temp_new_internal(TCGType, TCGTempKind); 859 void tcg_temp_free_internal(TCGTemp *); 860 TCGv_vec tcg_temp_new_vec(TCGType type); 861 TCGv_vec tcg_temp_new_vec_matching(TCGv_vec match); 862 863 static inline void tcg_temp_free_i32(TCGv_i32 arg) 864 { 865 tcg_temp_free_internal(tcgv_i32_temp(arg)); 866 } 867 868 static inline void tcg_temp_free_i64(TCGv_i64 arg) 869 { 870 tcg_temp_free_internal(tcgv_i64_temp(arg)); 871 } 872 873 static inline void tcg_temp_free_i128(TCGv_i128 arg) 874 { 875 tcg_temp_free_internal(tcgv_i128_temp(arg)); 876 } 877 878 static inline void tcg_temp_free_ptr(TCGv_ptr arg) 879 { 880 tcg_temp_free_internal(tcgv_ptr_temp(arg)); 881 } 882 883 static inline void tcg_temp_free_vec(TCGv_vec arg) 884 { 885 tcg_temp_free_internal(tcgv_vec_temp(arg)); 886 } 887 888 static inline TCGv_i32 tcg_global_mem_new_i32(TCGv_ptr reg, intptr_t offset, 889 const char *name) 890 { 891 TCGTemp *t = tcg_global_mem_new_internal(TCG_TYPE_I32, reg, offset, name); 892 return temp_tcgv_i32(t); 893 } 894 895 /* Used only by tcg infrastructure: tcg-op.c or plugin-gen.c */ 896 static inline TCGv_i32 tcg_temp_ebb_new_i32(void) 897 { 898 TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I32, TEMP_EBB); 899 return temp_tcgv_i32(t); 900 } 901 902 static inline TCGv_i32 tcg_temp_new_i32(void) 903 { 904 TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I32, TEMP_TB); 905 return temp_tcgv_i32(t); 906 } 907 908 static inline TCGv_i32 tcg_temp_local_new_i32(void) 909 { 910 TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I32, TEMP_TB); 911 return temp_tcgv_i32(t); 912 } 913 914 static inline TCGv_i64 tcg_global_mem_new_i64(TCGv_ptr reg, intptr_t offset, 915 const char *name) 916 { 917 TCGTemp *t = tcg_global_mem_new_internal(TCG_TYPE_I64, reg, offset, name); 918 return temp_tcgv_i64(t); 919 } 920 921 /* Used only by tcg infrastructure: tcg-op.c or plugin-gen.c */ 922 static inline TCGv_i64 tcg_temp_ebb_new_i64(void) 923 { 924 TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I64, TEMP_EBB); 925 return temp_tcgv_i64(t); 926 } 927 928 static inline TCGv_i64 tcg_temp_new_i64(void) 929 { 930 TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I64, TEMP_TB); 931 return temp_tcgv_i64(t); 932 } 933 934 static inline TCGv_i64 tcg_temp_local_new_i64(void) 935 { 936 TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I64, TEMP_TB); 937 return temp_tcgv_i64(t); 938 } 939 940 /* Used only by tcg infrastructure: tcg-op.c or plugin-gen.c */ 941 static inline TCGv_i128 tcg_temp_ebb_new_i128(void) 942 { 943 TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I128, TEMP_EBB); 944 return temp_tcgv_i128(t); 945 } 946 947 static inline TCGv_i128 tcg_temp_new_i128(void) 948 { 949 TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I128, TEMP_TB); 950 return temp_tcgv_i128(t); 951 } 952 953 static inline TCGv_i128 tcg_temp_local_new_i128(void) 954 { 955 TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I128, TEMP_TB); 956 return temp_tcgv_i128(t); 957 } 958 959 static inline TCGv_ptr tcg_global_mem_new_ptr(TCGv_ptr reg, intptr_t offset, 960 const char *name) 961 { 962 TCGTemp *t = tcg_global_mem_new_internal(TCG_TYPE_PTR, reg, offset, name); 963 return temp_tcgv_ptr(t); 964 } 965 966 /* Used only by tcg infrastructure: tcg-op.c or plugin-gen.c */ 967 static inline TCGv_ptr tcg_temp_ebb_new_ptr(void) 968 { 969 TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_PTR, TEMP_EBB); 970 return temp_tcgv_ptr(t); 971 } 972 973 static inline TCGv_ptr tcg_temp_new_ptr(void) 974 { 975 TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_PTR, TEMP_TB); 976 return temp_tcgv_ptr(t); 977 } 978 979 static inline TCGv_ptr tcg_temp_local_new_ptr(void) 980 { 981 TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_PTR, TEMP_TB); 982 return temp_tcgv_ptr(t); 983 } 984 985 #if defined(CONFIG_DEBUG_TCG) 986 /* If you call tcg_clear_temp_count() at the start of a section of 987 * code which is not supposed to leak any TCG temporaries, then 988 * calling tcg_check_temp_count() at the end of the section will 989 * return 1 if the section did in fact leak a temporary. 990 */ 991 void tcg_clear_temp_count(void); 992 int tcg_check_temp_count(void); 993 #else 994 #define tcg_clear_temp_count() do { } while (0) 995 #define tcg_check_temp_count() 0 996 #endif 997 998 int64_t tcg_cpu_exec_time(void); 999 void tcg_dump_info(GString *buf); 1000 void tcg_dump_op_count(GString *buf); 1001 1002 #define TCG_CT_CONST 1 /* any constant of register size */ 1003 1004 typedef struct TCGArgConstraint { 1005 unsigned ct : 16; 1006 unsigned alias_index : 4; 1007 unsigned sort_index : 4; 1008 unsigned pair_index : 4; 1009 unsigned pair : 2; /* 0: none, 1: first, 2: second, 3: second alias */ 1010 bool oalias : 1; 1011 bool ialias : 1; 1012 bool newreg : 1; 1013 TCGRegSet regs; 1014 } TCGArgConstraint; 1015 1016 #define TCG_MAX_OP_ARGS 16 1017 1018 /* Bits for TCGOpDef->flags, 8 bits available, all used. */ 1019 enum { 1020 /* Instruction exits the translation block. */ 1021 TCG_OPF_BB_EXIT = 0x01, 1022 /* Instruction defines the end of a basic block. */ 1023 TCG_OPF_BB_END = 0x02, 1024 /* Instruction clobbers call registers and potentially update globals. */ 1025 TCG_OPF_CALL_CLOBBER = 0x04, 1026 /* Instruction has side effects: it cannot be removed if its outputs 1027 are not used, and might trigger exceptions. */ 1028 TCG_OPF_SIDE_EFFECTS = 0x08, 1029 /* Instruction operands are 64-bits (otherwise 32-bits). */ 1030 TCG_OPF_64BIT = 0x10, 1031 /* Instruction is optional and not implemented by the host, or insn 1032 is generic and should not be implemened by the host. */ 1033 TCG_OPF_NOT_PRESENT = 0x20, 1034 /* Instruction operands are vectors. */ 1035 TCG_OPF_VECTOR = 0x40, 1036 /* Instruction is a conditional branch. */ 1037 TCG_OPF_COND_BRANCH = 0x80 1038 }; 1039 1040 typedef struct TCGOpDef { 1041 const char *name; 1042 uint8_t nb_oargs, nb_iargs, nb_cargs, nb_args; 1043 uint8_t flags; 1044 TCGArgConstraint *args_ct; 1045 } TCGOpDef; 1046 1047 extern TCGOpDef tcg_op_defs[]; 1048 extern const size_t tcg_op_defs_max; 1049 1050 typedef struct TCGTargetOpDef { 1051 TCGOpcode op; 1052 const char *args_ct_str[TCG_MAX_OP_ARGS]; 1053 } TCGTargetOpDef; 1054 1055 #define tcg_abort() \ 1056 do {\ 1057 fprintf(stderr, "%s:%d: tcg fatal error\n", __FILE__, __LINE__);\ 1058 abort();\ 1059 } while (0) 1060 1061 bool tcg_op_supported(TCGOpcode op); 1062 1063 void tcg_gen_callN(void *func, TCGTemp *ret, int nargs, TCGTemp **args); 1064 1065 TCGOp *tcg_emit_op(TCGOpcode opc, unsigned nargs); 1066 void tcg_op_remove(TCGContext *s, TCGOp *op); 1067 TCGOp *tcg_op_insert_before(TCGContext *s, TCGOp *op, 1068 TCGOpcode opc, unsigned nargs); 1069 TCGOp *tcg_op_insert_after(TCGContext *s, TCGOp *op, 1070 TCGOpcode opc, unsigned nargs); 1071 1072 /** 1073 * tcg_remove_ops_after: 1074 * @op: target operation 1075 * 1076 * Discard any opcodes emitted since @op. Expected usage is to save 1077 * a starting point with tcg_last_op(), speculatively emit opcodes, 1078 * then decide whether or not to keep those opcodes after the fact. 1079 */ 1080 void tcg_remove_ops_after(TCGOp *op); 1081 1082 void tcg_optimize(TCGContext *s); 1083 1084 /* Allocate a new temporary and initialize it with a constant. */ 1085 TCGv_i32 tcg_const_i32(int32_t val); 1086 TCGv_i64 tcg_const_i64(int64_t val); 1087 TCGv_i32 tcg_const_local_i32(int32_t val); 1088 TCGv_i64 tcg_const_local_i64(int64_t val); 1089 TCGv_vec tcg_const_zeros_vec(TCGType); 1090 TCGv_vec tcg_const_ones_vec(TCGType); 1091 TCGv_vec tcg_const_zeros_vec_matching(TCGv_vec); 1092 TCGv_vec tcg_const_ones_vec_matching(TCGv_vec); 1093 1094 /* 1095 * Locate or create a read-only temporary that is a constant. 1096 * This kind of temporary need not be freed, but for convenience 1097 * will be silently ignored by tcg_temp_free_*. 1098 */ 1099 TCGTemp *tcg_constant_internal(TCGType type, int64_t val); 1100 1101 static inline TCGv_i32 tcg_constant_i32(int32_t val) 1102 { 1103 return temp_tcgv_i32(tcg_constant_internal(TCG_TYPE_I32, val)); 1104 } 1105 1106 static inline TCGv_i64 tcg_constant_i64(int64_t val) 1107 { 1108 return temp_tcgv_i64(tcg_constant_internal(TCG_TYPE_I64, val)); 1109 } 1110 1111 TCGv_vec tcg_constant_vec(TCGType type, unsigned vece, int64_t val); 1112 TCGv_vec tcg_constant_vec_matching(TCGv_vec match, unsigned vece, int64_t val); 1113 1114 #if UINTPTR_MAX == UINT32_MAX 1115 # define tcg_const_ptr(x) ((TCGv_ptr)tcg_const_i32((intptr_t)(x))) 1116 # define tcg_const_local_ptr(x) ((TCGv_ptr)tcg_const_local_i32((intptr_t)(x))) 1117 # define tcg_constant_ptr(x) ((TCGv_ptr)tcg_constant_i32((intptr_t)(x))) 1118 #else 1119 # define tcg_const_ptr(x) ((TCGv_ptr)tcg_const_i64((intptr_t)(x))) 1120 # define tcg_const_local_ptr(x) ((TCGv_ptr)tcg_const_local_i64((intptr_t)(x))) 1121 # define tcg_constant_ptr(x) ((TCGv_ptr)tcg_constant_i64((intptr_t)(x))) 1122 #endif 1123 1124 TCGLabel *gen_new_label(void); 1125 1126 /** 1127 * label_arg 1128 * @l: label 1129 * 1130 * Encode a label for storage in the TCG opcode stream. 1131 */ 1132 1133 static inline TCGArg label_arg(TCGLabel *l) 1134 { 1135 return (uintptr_t)l; 1136 } 1137 1138 /** 1139 * arg_label 1140 * @i: value 1141 * 1142 * The opposite of label_arg. Retrieve a label from the 1143 * encoding of the TCG opcode stream. 1144 */ 1145 1146 static inline TCGLabel *arg_label(TCGArg i) 1147 { 1148 return (TCGLabel *)(uintptr_t)i; 1149 } 1150 1151 /** 1152 * tcg_ptr_byte_diff 1153 * @a, @b: addresses to be differenced 1154 * 1155 * There are many places within the TCG backends where we need a byte 1156 * difference between two pointers. While this can be accomplished 1157 * with local casting, it's easy to get wrong -- especially if one is 1158 * concerned with the signedness of the result. 1159 * 1160 * This version relies on GCC's void pointer arithmetic to get the 1161 * correct result. 1162 */ 1163 1164 static inline ptrdiff_t tcg_ptr_byte_diff(const void *a, const void *b) 1165 { 1166 return a - b; 1167 } 1168 1169 /** 1170 * tcg_pcrel_diff 1171 * @s: the tcg context 1172 * @target: address of the target 1173 * 1174 * Produce a pc-relative difference, from the current code_ptr 1175 * to the destination address. 1176 */ 1177 1178 static inline ptrdiff_t tcg_pcrel_diff(TCGContext *s, const void *target) 1179 { 1180 return tcg_ptr_byte_diff(target, tcg_splitwx_to_rx(s->code_ptr)); 1181 } 1182 1183 /** 1184 * tcg_tbrel_diff 1185 * @s: the tcg context 1186 * @target: address of the target 1187 * 1188 * Produce a difference, from the beginning of the current TB code 1189 * to the destination address. 1190 */ 1191 static inline ptrdiff_t tcg_tbrel_diff(TCGContext *s, const void *target) 1192 { 1193 return tcg_ptr_byte_diff(target, tcg_splitwx_to_rx(s->code_buf)); 1194 } 1195 1196 /** 1197 * tcg_current_code_size 1198 * @s: the tcg context 1199 * 1200 * Compute the current code size within the translation block. 1201 * This is used to fill in qemu's data structures for goto_tb. 1202 */ 1203 1204 static inline size_t tcg_current_code_size(TCGContext *s) 1205 { 1206 return tcg_ptr_byte_diff(s->code_ptr, s->code_buf); 1207 } 1208 1209 /** 1210 * tcg_qemu_tb_exec: 1211 * @env: pointer to CPUArchState for the CPU 1212 * @tb_ptr: address of generated code for the TB to execute 1213 * 1214 * Start executing code from a given translation block. 1215 * Where translation blocks have been linked, execution 1216 * may proceed from the given TB into successive ones. 1217 * Control eventually returns only when some action is needed 1218 * from the top-level loop: either control must pass to a TB 1219 * which has not yet been directly linked, or an asynchronous 1220 * event such as an interrupt needs handling. 1221 * 1222 * Return: The return value is the value passed to the corresponding 1223 * tcg_gen_exit_tb() at translation time of the last TB attempted to execute. 1224 * The value is either zero or a 4-byte aligned pointer to that TB combined 1225 * with additional information in its two least significant bits. The 1226 * additional information is encoded as follows: 1227 * 0, 1: the link between this TB and the next is via the specified 1228 * TB index (0 or 1). That is, we left the TB via (the equivalent 1229 * of) "goto_tb <index>". The main loop uses this to determine 1230 * how to link the TB just executed to the next. 1231 * 2: we are using instruction counting code generation, and we 1232 * did not start executing this TB because the instruction counter 1233 * would hit zero midway through it. In this case the pointer 1234 * returned is the TB we were about to execute, and the caller must 1235 * arrange to execute the remaining count of instructions. 1236 * 3: we stopped because the CPU's exit_request flag was set 1237 * (usually meaning that there is an interrupt that needs to be 1238 * handled). The pointer returned is the TB we were about to execute 1239 * when we noticed the pending exit request. 1240 * 1241 * If the bottom two bits indicate an exit-via-index then the CPU 1242 * state is correctly synchronised and ready for execution of the next 1243 * TB (and in particular the guest PC is the address to execute next). 1244 * Otherwise, we gave up on execution of this TB before it started, and 1245 * the caller must fix up the CPU state by calling the CPU's 1246 * synchronize_from_tb() method with the TB pointer we return (falling 1247 * back to calling the CPU's set_pc method with tb->pb if no 1248 * synchronize_from_tb() method exists). 1249 * 1250 * Note that TCG targets may use a different definition of tcg_qemu_tb_exec 1251 * to this default (which just calls the prologue.code emitted by 1252 * tcg_target_qemu_prologue()). 1253 */ 1254 #define TB_EXIT_MASK 3 1255 #define TB_EXIT_IDX0 0 1256 #define TB_EXIT_IDX1 1 1257 #define TB_EXIT_IDXMAX 1 1258 #define TB_EXIT_REQUESTED 3 1259 1260 #ifdef CONFIG_TCG_INTERPRETER 1261 uintptr_t tcg_qemu_tb_exec(CPUArchState *env, const void *tb_ptr); 1262 #else 1263 typedef uintptr_t tcg_prologue_fn(CPUArchState *env, const void *tb_ptr); 1264 extern tcg_prologue_fn *tcg_qemu_tb_exec; 1265 #endif 1266 1267 void tcg_register_jit(const void *buf, size_t buf_size); 1268 1269 #if TCG_TARGET_MAYBE_vec 1270 /* Return zero if the tuple (opc, type, vece) is unsupportable; 1271 return > 0 if it is directly supportable; 1272 return < 0 if we must call tcg_expand_vec_op. */ 1273 int tcg_can_emit_vec_op(TCGOpcode, TCGType, unsigned); 1274 #else 1275 static inline int tcg_can_emit_vec_op(TCGOpcode o, TCGType t, unsigned ve) 1276 { 1277 return 0; 1278 } 1279 #endif 1280 1281 /* Expand the tuple (opc, type, vece) on the given arguments. */ 1282 void tcg_expand_vec_op(TCGOpcode, TCGType, unsigned, TCGArg, ...); 1283 1284 /* Replicate a constant C accoring to the log2 of the element size. */ 1285 uint64_t dup_const(unsigned vece, uint64_t c); 1286 1287 #define dup_const(VECE, C) \ 1288 (__builtin_constant_p(VECE) \ 1289 ? ( (VECE) == MO_8 ? 0x0101010101010101ull * (uint8_t)(C) \ 1290 : (VECE) == MO_16 ? 0x0001000100010001ull * (uint16_t)(C) \ 1291 : (VECE) == MO_32 ? 0x0000000100000001ull * (uint32_t)(C) \ 1292 : (VECE) == MO_64 ? (uint64_t)(C) \ 1293 : (qemu_build_not_reached_always(), 0)) \ 1294 : dup_const(VECE, C)) 1295 1296 #if TARGET_LONG_BITS == 64 1297 # define dup_const_tl dup_const 1298 #else 1299 # define dup_const_tl(VECE, C) \ 1300 (__builtin_constant_p(VECE) \ 1301 ? ( (VECE) == MO_8 ? 0x01010101ul * (uint8_t)(C) \ 1302 : (VECE) == MO_16 ? 0x00010001ul * (uint16_t)(C) \ 1303 : (VECE) == MO_32 ? 0x00000001ul * (uint32_t)(C) \ 1304 : (qemu_build_not_reached_always(), 0)) \ 1305 : (target_long)dup_const(VECE, C)) 1306 #endif 1307 1308 #ifdef CONFIG_DEBUG_TCG 1309 void tcg_assert_listed_vecop(TCGOpcode); 1310 #else 1311 static inline void tcg_assert_listed_vecop(TCGOpcode op) { } 1312 #endif 1313 1314 static inline const TCGOpcode *tcg_swap_vecop_list(const TCGOpcode *n) 1315 { 1316 #ifdef CONFIG_DEBUG_TCG 1317 const TCGOpcode *o = tcg_ctx->vecop_list; 1318 tcg_ctx->vecop_list = n; 1319 return o; 1320 #else 1321 return NULL; 1322 #endif 1323 } 1324 1325 bool tcg_can_emit_vecop_list(const TCGOpcode *, TCGType, unsigned); 1326 1327 #endif /* TCG_H */ 1328