tcg/tcg.h

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