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 #include "qemu-common.h" 25 #include "tcg-target.h" 26 #include "tcg-runtime.h" 27 28 #if TCG_TARGET_REG_BITS == 32 29 typedef int32_t tcg_target_long; 30 typedef uint32_t tcg_target_ulong; 31 #define TCG_PRIlx PRIx32 32 #define TCG_PRIld PRId32 33 #elif TCG_TARGET_REG_BITS == 64 34 typedef int64_t tcg_target_long; 35 typedef uint64_t tcg_target_ulong; 36 #define TCG_PRIlx PRIx64 37 #define TCG_PRIld PRId64 38 #else 39 #error unsupported 40 #endif 41 42 #if TCG_TARGET_NB_REGS <= 32 43 typedef uint32_t TCGRegSet; 44 #elif TCG_TARGET_NB_REGS <= 64 45 typedef uint64_t TCGRegSet; 46 #else 47 #error unsupported 48 #endif 49 50 typedef enum TCGOpcode { 51 #define DEF(name, oargs, iargs, cargs, flags) INDEX_op_ ## name, 52 #include "tcg-opc.h" 53 #undef DEF 54 NB_OPS, 55 } TCGOpcode; 56 57 #define tcg_regset_clear(d) (d) = 0 58 #define tcg_regset_set(d, s) (d) = (s) 59 #define tcg_regset_set32(d, reg, val32) (d) |= (val32) << (reg) 60 #define tcg_regset_set_reg(d, r) (d) |= 1L << (r) 61 #define tcg_regset_reset_reg(d, r) (d) &= ~(1L << (r)) 62 #define tcg_regset_test_reg(d, r) (((d) >> (r)) & 1) 63 #define tcg_regset_or(d, a, b) (d) = (a) | (b) 64 #define tcg_regset_and(d, a, b) (d) = (a) & (b) 65 #define tcg_regset_andnot(d, a, b) (d) = (a) & ~(b) 66 #define tcg_regset_not(d, a) (d) = ~(a) 67 68 typedef struct TCGRelocation { 69 struct TCGRelocation *next; 70 int type; 71 uint8_t *ptr; 72 tcg_target_long addend; 73 } TCGRelocation; 74 75 typedef struct TCGLabel { 76 int has_value; 77 union { 78 tcg_target_ulong value; 79 TCGRelocation *first_reloc; 80 } u; 81 } TCGLabel; 82 83 typedef struct TCGPool { 84 struct TCGPool *next; 85 int size; 86 uint8_t data[0] __attribute__ ((aligned)); 87 } TCGPool; 88 89 #define TCG_POOL_CHUNK_SIZE 32768 90 91 #define TCG_MAX_LABELS 512 92 93 #define TCG_MAX_TEMPS 512 94 95 /* when the size of the arguments of a called function is smaller than 96 this value, they are statically allocated in the TB stack frame */ 97 #define TCG_STATIC_CALL_ARGS_SIZE 128 98 99 typedef enum TCGType { 100 TCG_TYPE_I32, 101 TCG_TYPE_I64, 102 TCG_TYPE_COUNT, /* number of different types */ 103 104 /* An alias for the size of the host register. */ 105 #if TCG_TARGET_REG_BITS == 32 106 TCG_TYPE_REG = TCG_TYPE_I32, 107 #else 108 TCG_TYPE_REG = TCG_TYPE_I64, 109 #endif 110 111 /* An alias for the size of the native pointer. We don't currently 112 support any hosts with 64-bit registers and 32-bit pointers. */ 113 TCG_TYPE_PTR = TCG_TYPE_REG, 114 115 /* An alias for the size of the target "long", aka register. */ 116 #if TARGET_LONG_BITS == 64 117 TCG_TYPE_TL = TCG_TYPE_I64, 118 #else 119 TCG_TYPE_TL = TCG_TYPE_I32, 120 #endif 121 } TCGType; 122 123 typedef tcg_target_ulong TCGArg; 124 125 /* Define a type and accessor macros for varables. Using a struct is 126 nice because it gives some level of type safely. Ideally the compiler 127 be able to see through all this. However in practice this is not true, 128 expecially on targets with braindamaged ABIs (e.g. i386). 129 We use plain int by default to avoid this runtime overhead. 130 Users of tcg_gen_* don't need to know about any of this, and should 131 treat TCGv as an opaque type. 132 In additon we do typechecking for different types of variables. TCGv_i32 133 and TCGv_i64 are 32/64-bit variables respectively. TCGv and TCGv_ptr 134 are aliases for target_ulong and host pointer sized values respectively. 135 */ 136 137 #ifdef CONFIG_DEBUG_TCG 138 #define DEBUG_TCGV 1 139 #endif 140 141 #ifdef DEBUG_TCGV 142 143 typedef struct 144 { 145 int i32; 146 } TCGv_i32; 147 148 typedef struct 149 { 150 int i64; 151 } TCGv_i64; 152 153 #define MAKE_TCGV_I32(i) __extension__ \ 154 ({ TCGv_i32 make_tcgv_tmp = {i}; make_tcgv_tmp;}) 155 #define MAKE_TCGV_I64(i) __extension__ \ 156 ({ TCGv_i64 make_tcgv_tmp = {i}; make_tcgv_tmp;}) 157 #define GET_TCGV_I32(t) ((t).i32) 158 #define GET_TCGV_I64(t) ((t).i64) 159 #if TCG_TARGET_REG_BITS == 32 160 #define TCGV_LOW(t) MAKE_TCGV_I32(GET_TCGV_I64(t)) 161 #define TCGV_HIGH(t) MAKE_TCGV_I32(GET_TCGV_I64(t) + 1) 162 #endif 163 164 #else /* !DEBUG_TCGV */ 165 166 typedef int TCGv_i32; 167 typedef int TCGv_i64; 168 #define MAKE_TCGV_I32(x) (x) 169 #define MAKE_TCGV_I64(x) (x) 170 #define GET_TCGV_I32(t) (t) 171 #define GET_TCGV_I64(t) (t) 172 173 #if TCG_TARGET_REG_BITS == 32 174 #define TCGV_LOW(t) (t) 175 #define TCGV_HIGH(t) ((t) + 1) 176 #endif 177 178 #endif /* DEBUG_TCGV */ 179 180 #define TCGV_EQUAL_I32(a, b) (GET_TCGV_I32(a) == GET_TCGV_I32(b)) 181 #define TCGV_EQUAL_I64(a, b) (GET_TCGV_I64(a) == GET_TCGV_I64(b)) 182 183 /* Dummy definition to avoid compiler warnings. */ 184 #define TCGV_UNUSED_I32(x) x = MAKE_TCGV_I32(-1) 185 #define TCGV_UNUSED_I64(x) x = MAKE_TCGV_I64(-1) 186 187 /* call flags */ 188 #define TCG_CALL_TYPE_MASK 0x000f 189 #define TCG_CALL_TYPE_STD 0x0000 /* standard C call */ 190 #define TCG_CALL_TYPE_REGPARM_1 0x0001 /* i386 style regparm call (1 reg) */ 191 #define TCG_CALL_TYPE_REGPARM_2 0x0002 /* i386 style regparm call (2 regs) */ 192 #define TCG_CALL_TYPE_REGPARM 0x0003 /* i386 style regparm call (3 regs) */ 193 /* A pure function only reads its arguments and TCG global variables 194 and cannot raise exceptions. Hence a call to a pure function can be 195 safely suppressed if the return value is not used. */ 196 #define TCG_CALL_PURE 0x0010 197 /* A const function only reads its arguments and does not use TCG 198 global variables. Hence a call to such a function does not 199 save TCG global variables back to their canonical location. */ 200 #define TCG_CALL_CONST 0x0020 201 202 /* used to align parameters */ 203 #define TCG_CALL_DUMMY_TCGV MAKE_TCGV_I32(-1) 204 #define TCG_CALL_DUMMY_ARG ((TCGArg)(-1)) 205 206 typedef enum { 207 TCG_COND_EQ, 208 TCG_COND_NE, 209 TCG_COND_LT, 210 TCG_COND_GE, 211 TCG_COND_LE, 212 TCG_COND_GT, 213 /* unsigned */ 214 TCG_COND_LTU, 215 TCG_COND_GEU, 216 TCG_COND_LEU, 217 TCG_COND_GTU, 218 } TCGCond; 219 220 /* Invert the sense of the comparison. */ 221 static inline TCGCond tcg_invert_cond(TCGCond c) 222 { 223 return (TCGCond)(c ^ 1); 224 } 225 226 /* Swap the operands in a comparison. */ 227 static inline TCGCond tcg_swap_cond(TCGCond c) 228 { 229 int mask = (c < TCG_COND_LT ? 0 : c < TCG_COND_LTU ? 7 : 15); 230 return (TCGCond)(c ^ mask); 231 } 232 233 static inline TCGCond tcg_unsigned_cond(TCGCond c) 234 { 235 return (c >= TCG_COND_LT && c <= TCG_COND_GT ? c + 4 : c); 236 } 237 238 #define TEMP_VAL_DEAD 0 239 #define TEMP_VAL_REG 1 240 #define TEMP_VAL_MEM 2 241 #define TEMP_VAL_CONST 3 242 243 /* XXX: optimize memory layout */ 244 typedef struct TCGTemp { 245 TCGType base_type; 246 TCGType type; 247 int val_type; 248 int reg; 249 tcg_target_long val; 250 int mem_reg; 251 tcg_target_long mem_offset; 252 unsigned int fixed_reg:1; 253 unsigned int mem_coherent:1; 254 unsigned int mem_allocated:1; 255 unsigned int temp_local:1; /* If true, the temp is saved accross 256 basic blocks. Otherwise, it is not 257 preserved accross basic blocks. */ 258 unsigned int temp_allocated:1; /* never used for code gen */ 259 /* index of next free temp of same base type, -1 if end */ 260 int next_free_temp; 261 const char *name; 262 } TCGTemp; 263 264 typedef struct TCGHelperInfo { 265 tcg_target_ulong func; 266 const char *name; 267 } TCGHelperInfo; 268 269 typedef struct TCGContext TCGContext; 270 271 struct TCGContext { 272 uint8_t *pool_cur, *pool_end; 273 TCGPool *pool_first, *pool_current; 274 TCGLabel *labels; 275 int nb_labels; 276 TCGTemp *temps; /* globals first, temps after */ 277 int nb_globals; 278 int nb_temps; 279 /* index of free temps, -1 if none */ 280 int first_free_temp[TCG_TYPE_COUNT * 2]; 281 282 /* goto_tb support */ 283 uint8_t *code_buf; 284 unsigned long *tb_next; 285 uint16_t *tb_next_offset; 286 uint16_t *tb_jmp_offset; /* != NULL if USE_DIRECT_JUMP */ 287 288 /* liveness analysis */ 289 uint16_t *op_dead_iargs; /* for each operation, each bit tells if the 290 corresponding input argument is dead */ 291 292 /* tells in which temporary a given register is. It does not take 293 into account fixed registers */ 294 int reg_to_temp[TCG_TARGET_NB_REGS]; 295 TCGRegSet reserved_regs; 296 tcg_target_long current_frame_offset; 297 tcg_target_long frame_start; 298 tcg_target_long frame_end; 299 int frame_reg; 300 301 uint8_t *code_ptr; 302 TCGTemp static_temps[TCG_MAX_TEMPS]; 303 304 TCGHelperInfo *helpers; 305 int nb_helpers; 306 int allocated_helpers; 307 int helpers_sorted; 308 309 #ifdef CONFIG_PROFILER 310 /* profiling info */ 311 int64_t tb_count1; 312 int64_t tb_count; 313 int64_t op_count; /* total insn count */ 314 int op_count_max; /* max insn per TB */ 315 int64_t temp_count; 316 int temp_count_max; 317 int64_t del_op_count; 318 int64_t code_in_len; 319 int64_t code_out_len; 320 int64_t interm_time; 321 int64_t code_time; 322 int64_t la_time; 323 int64_t restore_count; 324 int64_t restore_time; 325 #endif 326 327 #ifdef CONFIG_DEBUG_TCG 328 int temps_in_use; 329 #endif 330 }; 331 332 extern TCGContext tcg_ctx; 333 extern uint16_t *gen_opc_ptr; 334 extern TCGArg *gen_opparam_ptr; 335 extern uint16_t gen_opc_buf[]; 336 extern TCGArg gen_opparam_buf[]; 337 338 /* pool based memory allocation */ 339 340 void *tcg_malloc_internal(TCGContext *s, int size); 341 void tcg_pool_reset(TCGContext *s); 342 void tcg_pool_delete(TCGContext *s); 343 344 static inline void *tcg_malloc(int size) 345 { 346 TCGContext *s = &tcg_ctx; 347 uint8_t *ptr, *ptr_end; 348 size = (size + sizeof(long) - 1) & ~(sizeof(long) - 1); 349 ptr = s->pool_cur; 350 ptr_end = ptr + size; 351 if (unlikely(ptr_end > s->pool_end)) { 352 return tcg_malloc_internal(&tcg_ctx, size); 353 } else { 354 s->pool_cur = ptr_end; 355 return ptr; 356 } 357 } 358 359 void tcg_context_init(TCGContext *s); 360 void tcg_prologue_init(TCGContext *s); 361 void tcg_func_start(TCGContext *s); 362 363 int tcg_gen_code(TCGContext *s, uint8_t *gen_code_buf); 364 int tcg_gen_code_search_pc(TCGContext *s, uint8_t *gen_code_buf, long offset); 365 366 void tcg_set_frame(TCGContext *s, int reg, 367 tcg_target_long start, tcg_target_long size); 368 369 TCGv_i32 tcg_global_reg_new_i32(int reg, const char *name); 370 TCGv_i32 tcg_global_mem_new_i32(int reg, tcg_target_long offset, 371 const char *name); 372 TCGv_i32 tcg_temp_new_internal_i32(int temp_local); 373 static inline TCGv_i32 tcg_temp_new_i32(void) 374 { 375 return tcg_temp_new_internal_i32(0); 376 } 377 static inline TCGv_i32 tcg_temp_local_new_i32(void) 378 { 379 return tcg_temp_new_internal_i32(1); 380 } 381 void tcg_temp_free_i32(TCGv_i32 arg); 382 char *tcg_get_arg_str_i32(TCGContext *s, char *buf, int buf_size, TCGv_i32 arg); 383 384 TCGv_i64 tcg_global_reg_new_i64(int reg, const char *name); 385 TCGv_i64 tcg_global_mem_new_i64(int reg, tcg_target_long offset, 386 const char *name); 387 TCGv_i64 tcg_temp_new_internal_i64(int temp_local); 388 static inline TCGv_i64 tcg_temp_new_i64(void) 389 { 390 return tcg_temp_new_internal_i64(0); 391 } 392 static inline TCGv_i64 tcg_temp_local_new_i64(void) 393 { 394 return tcg_temp_new_internal_i64(1); 395 } 396 void tcg_temp_free_i64(TCGv_i64 arg); 397 char *tcg_get_arg_str_i64(TCGContext *s, char *buf, int buf_size, TCGv_i64 arg); 398 399 #if defined(CONFIG_DEBUG_TCG) 400 /* If you call tcg_clear_temp_count() at the start of a section of 401 * code which is not supposed to leak any TCG temporaries, then 402 * calling tcg_check_temp_count() at the end of the section will 403 * return 1 if the section did in fact leak a temporary. 404 */ 405 void tcg_clear_temp_count(void); 406 int tcg_check_temp_count(void); 407 #else 408 #define tcg_clear_temp_count() do { } while (0) 409 #define tcg_check_temp_count() 0 410 #endif 411 412 void tcg_dump_info(FILE *f, fprintf_function cpu_fprintf); 413 414 #define TCG_CT_ALIAS 0x80 415 #define TCG_CT_IALIAS 0x40 416 #define TCG_CT_REG 0x01 417 #define TCG_CT_CONST 0x02 /* any constant of register size */ 418 419 typedef struct TCGArgConstraint { 420 uint16_t ct; 421 uint8_t alias_index; 422 union { 423 TCGRegSet regs; 424 } u; 425 } TCGArgConstraint; 426 427 #define TCG_MAX_OP_ARGS 16 428 429 #define TCG_OPF_BB_END 0x01 /* instruction defines the end of a basic 430 block */ 431 #define TCG_OPF_CALL_CLOBBER 0x02 /* instruction clobbers call registers 432 and potentially update globals. */ 433 #define TCG_OPF_SIDE_EFFECTS 0x04 /* instruction has side effects : it 434 cannot be removed if its output 435 are not used */ 436 437 typedef struct TCGOpDef { 438 const char *name; 439 uint8_t nb_oargs, nb_iargs, nb_cargs, nb_args; 440 uint8_t flags; 441 TCGArgConstraint *args_ct; 442 int *sorted_args; 443 #if defined(CONFIG_DEBUG_TCG) 444 int used; 445 #endif 446 } TCGOpDef; 447 448 typedef struct TCGTargetOpDef { 449 TCGOpcode op; 450 const char *args_ct_str[TCG_MAX_OP_ARGS]; 451 } TCGTargetOpDef; 452 453 #define tcg_abort() \ 454 do {\ 455 fprintf(stderr, "%s:%d: tcg fatal error\n", __FILE__, __LINE__);\ 456 abort();\ 457 } while (0) 458 459 void tcg_add_target_add_op_defs(const TCGTargetOpDef *tdefs); 460 461 #if TCG_TARGET_REG_BITS == 32 462 #define tcg_const_ptr tcg_const_i32 463 #define tcg_add_ptr tcg_add_i32 464 #define tcg_sub_ptr tcg_sub_i32 465 #define TCGv_ptr TCGv_i32 466 #define GET_TCGV_PTR GET_TCGV_I32 467 #define tcg_global_reg_new_ptr tcg_global_reg_new_i32 468 #define tcg_global_mem_new_ptr tcg_global_mem_new_i32 469 #define tcg_temp_new_ptr tcg_temp_new_i32 470 #define tcg_temp_free_ptr tcg_temp_free_i32 471 #else 472 #define tcg_const_ptr tcg_const_i64 473 #define tcg_add_ptr tcg_add_i64 474 #define tcg_sub_ptr tcg_sub_i64 475 #define TCGv_ptr TCGv_i64 476 #define GET_TCGV_PTR GET_TCGV_I64 477 #define tcg_global_reg_new_ptr tcg_global_reg_new_i64 478 #define tcg_global_mem_new_ptr tcg_global_mem_new_i64 479 #define tcg_temp_new_ptr tcg_temp_new_i64 480 #define tcg_temp_free_ptr tcg_temp_free_i64 481 #endif 482 483 void tcg_gen_callN(TCGContext *s, TCGv_ptr func, unsigned int flags, 484 int sizemask, TCGArg ret, int nargs, TCGArg *args); 485 486 void tcg_gen_shifti_i64(TCGv_i64 ret, TCGv_i64 arg1, 487 int c, int right, int arith); 488 489 /* only used for debugging purposes */ 490 void tcg_register_helper(void *func, const char *name); 491 const char *tcg_helper_get_name(TCGContext *s, void *func); 492 void tcg_dump_ops(TCGContext *s, FILE *outfile); 493 494 void dump_ops(const uint16_t *opc_buf, const TCGArg *opparam_buf); 495 TCGv_i32 tcg_const_i32(int32_t val); 496 TCGv_i64 tcg_const_i64(int64_t val); 497 TCGv_i32 tcg_const_local_i32(int32_t val); 498 TCGv_i64 tcg_const_local_i64(int64_t val); 499 500 extern uint8_t code_gen_prologue[]; 501 #if defined(_ARCH_PPC) && !defined(_ARCH_PPC64) 502 #define tcg_qemu_tb_exec(tb_ptr) \ 503 ((long REGPARM __attribute__ ((longcall)) (*)(void *))code_gen_prologue)(tb_ptr) 504 #else 505 #define tcg_qemu_tb_exec(tb_ptr) ((long REGPARM (*)(void *))code_gen_prologue)(tb_ptr) 506 #endif 507
