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
  25 #ifndef TCG_H
  26 #define TCG_H
  27
  28 #include "qemu-common.h"
  29 #include "cpu.h"
  30 #include "exec/tb-context.h"
  31 #include "qemu/bitops.h"
  32 #include "qemu/queue.h"
  33 #include "tcg-mo.h"
  34 #include "tcg-target.h"
  35 #include "qemu/int128.h"
  36
  37 /* XXX: make safe guess about sizes */
  38 #define MAX_OP_PER_INSTR 266
  39
  40 #if HOST_LONG_BITS == 32
  41 #define MAX_OPC_PARAM_PER_ARG 2
  42 #else
  43 #define MAX_OPC_PARAM_PER_ARG 1
  44 #endif
  45 #define MAX_OPC_PARAM_IARGS 6
  46 #define MAX_OPC_PARAM_OARGS 1
  47 #define MAX_OPC_PARAM_ARGS (MAX_OPC_PARAM_IARGS + MAX_OPC_PARAM_OARGS)
  48
  49 /* A Call op needs up to 4 + 2N parameters on 32-bit archs,
  50  * and up to 4 + N parameters on 64-bit archs
  51  * (N = number of input arguments + output arguments).  */
  52 #define MAX_OPC_PARAM (4 + (MAX_OPC_PARAM_PER_ARG * MAX_OPC_PARAM_ARGS))
  53
  54 #define CPU_TEMP_BUF_NLONGS 128
  55
  56 /* Default target word size to pointer size.  */
  57 #ifndef TCG_TARGET_REG_BITS
  58 # if UINTPTR_MAX == UINT32_MAX
  59 #  define TCG_TARGET_REG_BITS 32
  60 # elif UINTPTR_MAX == UINT64_MAX
  61 #  define TCG_TARGET_REG_BITS 64
  62 # else
  63 #  error Unknown pointer size for tcg target
  64 # endif
  65 #endif
  66
  67 #if TCG_TARGET_REG_BITS == 32
  68 typedef int32_t tcg_target_long;
  69 typedef uint32_t tcg_target_ulong;
  70 #define TCG_PRIlx PRIx32
  71 #define TCG_PRIld PRId32
  72 #elif TCG_TARGET_REG_BITS == 64
  73 typedef int64_t tcg_target_long;
  74 typedef uint64_t tcg_target_ulong;
  75 #define TCG_PRIlx PRIx64
  76 #define TCG_PRIld PRId64
  77 #else
  78 #error unsupported
  79 #endif
  80
  81 /* Oversized TCG guests make things like MTTCG hard
  82  * as we can't use atomics for cputlb updates.
  83  */
  84 #if TARGET_LONG_BITS > TCG_TARGET_REG_BITS
  85 #define TCG_OVERSIZED_GUEST 1
  86 #else
  87 #define TCG_OVERSIZED_GUEST 0
  88 #endif
  89
  90 #if TCG_TARGET_NB_REGS <= 32
  91 typedef uint32_t TCGRegSet;
  92 #elif TCG_TARGET_NB_REGS <= 64
  93 typedef uint64_t TCGRegSet;
  94 #else
  95 #error unsupported
  96 #endif
  97
  98 #if TCG_TARGET_REG_BITS == 32
  99 /* Turn some undef macros into false macros.  */
 100 #define TCG_TARGET_HAS_extrl_i64_i32    0
 101 #define TCG_TARGET_HAS_extrh_i64_i32    0
 102 #define TCG_TARGET_HAS_div_i64          0
 103 #define TCG_TARGET_HAS_rem_i64          0
 104 #define TCG_TARGET_HAS_div2_i64         0
 105 #define TCG_TARGET_HAS_rot_i64          0
 106 #define TCG_TARGET_HAS_ext8s_i64        0
 107 #define TCG_TARGET_HAS_ext16s_i64       0
 108 #define TCG_TARGET_HAS_ext32s_i64       0
 109 #define TCG_TARGET_HAS_ext8u_i64        0
 110 #define TCG_TARGET_HAS_ext16u_i64       0
 111 #define TCG_TARGET_HAS_ext32u_i64       0
 112 #define TCG_TARGET_HAS_bswap16_i64      0
 113 #define TCG_TARGET_HAS_bswap32_i64      0
 114 #define TCG_TARGET_HAS_bswap64_i64      0
 115 #define TCG_TARGET_HAS_neg_i64          0
 116 #define TCG_TARGET_HAS_not_i64          0
 117 #define TCG_TARGET_HAS_andc_i64         0
 118 #define TCG_TARGET_HAS_orc_i64          0
 119 #define TCG_TARGET_HAS_eqv_i64          0
 120 #define TCG_TARGET_HAS_nand_i64         0
 121 #define TCG_TARGET_HAS_nor_i64          0
 122 #define TCG_TARGET_HAS_clz_i64          0
 123 #define TCG_TARGET_HAS_ctz_i64          0
 124 #define TCG_TARGET_HAS_ctpop_i64        0
 125 #define TCG_TARGET_HAS_deposit_i64      0
 126 #define TCG_TARGET_HAS_extract_i64      0
 127 #define TCG_TARGET_HAS_sextract_i64     0
 128 #define TCG_TARGET_HAS_movcond_i64      0
 129 #define TCG_TARGET_HAS_add2_i64         0
 130 #define TCG_TARGET_HAS_sub2_i64         0
 131 #define TCG_TARGET_HAS_mulu2_i64        0
 132 #define TCG_TARGET_HAS_muls2_i64        0
 133 #define TCG_TARGET_HAS_muluh_i64        0
 134 #define TCG_TARGET_HAS_mulsh_i64        0
 135 /* Turn some undef macros into true macros.  */
 136 #define TCG_TARGET_HAS_add2_i32         1
 137 #define TCG_TARGET_HAS_sub2_i32         1
 138 #endif
 139
 140 #ifndef TCG_TARGET_deposit_i32_valid
 141 #define TCG_TARGET_deposit_i32_valid(ofs, len) 1
 142 #endif
 143 #ifndef TCG_TARGET_deposit_i64_valid
 144 #define TCG_TARGET_deposit_i64_valid(ofs, len) 1
 145 #endif
 146 #ifndef TCG_TARGET_extract_i32_valid
 147 #define TCG_TARGET_extract_i32_valid(ofs, len) 1
 148 #endif
 149 #ifndef TCG_TARGET_extract_i64_valid
 150 #define TCG_TARGET_extract_i64_valid(ofs, len) 1
 151 #endif
 152
 153 /* Only one of DIV or DIV2 should be defined.  */
 154 #if defined(TCG_TARGET_HAS_div_i32)
 155 #define TCG_TARGET_HAS_div2_i32         0
 156 #elif defined(TCG_TARGET_HAS_div2_i32)
 157 #define TCG_TARGET_HAS_div_i32          0
 158 #define TCG_TARGET_HAS_rem_i32          0
 159 #endif
 160 #if defined(TCG_TARGET_HAS_div_i64)
 161 #define TCG_TARGET_HAS_div2_i64         0
 162 #elif defined(TCG_TARGET_HAS_div2_i64)
 163 #define TCG_TARGET_HAS_div_i64          0
 164 #define TCG_TARGET_HAS_rem_i64          0
 165 #endif
 166
 167 /* For 32-bit targets, some sort of unsigned widening multiply is required.  */
 168 #if TCG_TARGET_REG_BITS == 32 \
 169     && !(defined(TCG_TARGET_HAS_mulu2_i32) \
 170          || defined(TCG_TARGET_HAS_muluh_i32))
 171 # error "Missing unsigned widening multiply"
 172 #endif
 173
 174 #if !defined(TCG_TARGET_HAS_v64) \
 175     && !defined(TCG_TARGET_HAS_v128) \
 176     && !defined(TCG_TARGET_HAS_v256)
 177 #define TCG_TARGET_MAYBE_vec            0
 178 #define TCG_TARGET_HAS_neg_vec          0
 179 #define TCG_TARGET_HAS_not_vec          0
 180 #define TCG_TARGET_HAS_andc_vec         0
 181 #define TCG_TARGET_HAS_orc_vec          0
 182 #define TCG_TARGET_HAS_shi_vec          0
 183 #define TCG_TARGET_HAS_shs_vec          0
 184 #define TCG_TARGET_HAS_shv_vec          0
 185 #define TCG_TARGET_HAS_mul_vec          0
 186 #define TCG_TARGET_HAS_sat_vec          0
 187 #define TCG_TARGET_HAS_minmax_vec       0
 188 #else
 189 #define TCG_TARGET_MAYBE_vec            1
 190 #endif
 191 #ifndef TCG_TARGET_HAS_v64
 192 #define TCG_TARGET_HAS_v64              0
 193 #endif
 194 #ifndef TCG_TARGET_HAS_v128
 195 #define TCG_TARGET_HAS_v128             0
 196 #endif
 197 #ifndef TCG_TARGET_HAS_v256
 198 #define TCG_TARGET_HAS_v256             0
 199 #endif
 200
 201 #ifndef TARGET_INSN_START_EXTRA_WORDS
 202 # define TARGET_INSN_START_WORDS 1
 203 #else
 204 # define TARGET_INSN_START_WORDS (1 + TARGET_INSN_START_EXTRA_WORDS)
 205 #endif
 206
 207 typedef enum TCGOpcode {
 208 #define DEF(name, oargs, iargs, cargs, flags) INDEX_op_ ## name,
 209 #include "tcg-opc.h"
 210 #undef DEF
 211     NB_OPS,
 212 } TCGOpcode;
 213
 214 #define tcg_regset_set_reg(d, r)   ((d) |= (TCGRegSet)1 << (r))
 215 #define tcg_regset_reset_reg(d, r) ((d) &= ~((TCGRegSet)1 << (r)))
 216 #define tcg_regset_test_reg(d, r)  (((d) >> (r)) & 1)
 217
 218 #ifndef TCG_TARGET_INSN_UNIT_SIZE
 219 # error "Missing TCG_TARGET_INSN_UNIT_SIZE"
 220 #elif TCG_TARGET_INSN_UNIT_SIZE == 1
 221 typedef uint8_t tcg_insn_unit;
 222 #elif TCG_TARGET_INSN_UNIT_SIZE == 2
 223 typedef uint16_t tcg_insn_unit;
 224 #elif TCG_TARGET_INSN_UNIT_SIZE == 4
 225 typedef uint32_t tcg_insn_unit;
 226 #elif TCG_TARGET_INSN_UNIT_SIZE == 8
 227 typedef uint64_t tcg_insn_unit;
 228 #else
 229 /* The port better have done this.  */
 230 #endif
 231
 232
 233 #if defined CONFIG_DEBUG_TCG || defined QEMU_STATIC_ANALYSIS
 234 # define tcg_debug_assert(X) do { assert(X); } while (0)
 235 #else
 236 # define tcg_debug_assert(X) \
 237     do { if (!(X)) { __builtin_unreachable(); } } while (0)
 238 #endif
 239
 240 typedef struct TCGRelocation {
 241     struct TCGRelocation *next;
 242     int type;
 243     tcg_insn_unit *ptr;
 244     intptr_t addend;
 245 } TCGRelocation;
 246
 247 typedef struct TCGLabel TCGLabel;
 248 struct TCGLabel {
 249     unsigned present : 1;
 250     unsigned has_value : 1;
 251     unsigned id : 14;
 252     unsigned refs : 16;
 253     union {
 254         uintptr_t value;
 255         tcg_insn_unit *value_ptr;
 256         TCGRelocation *first_reloc;
 257     } u;
 258 #ifdef CONFIG_DEBUG_TCG
 259     QSIMPLEQ_ENTRY(TCGLabel) next;
 260 #endif
 261 };
 262
 263 typedef struct TCGPool {
 264     struct TCGPool *next;
 265     int size;
 266     uint8_t data[0] __attribute__ ((aligned));
 267 } TCGPool;
 268
 269 #define TCG_POOL_CHUNK_SIZE 32768
 270
 271 #define TCG_MAX_TEMPS 512
 272 #define TCG_MAX_INSNS 512
 273
 274 /* when the size of the arguments of a called function is smaller than
 275    this value, they are statically allocated in the TB stack frame */
 276 #define TCG_STATIC_CALL_ARGS_SIZE 128
 277
 278 typedef enum TCGType {
 279     TCG_TYPE_I32,
 280     TCG_TYPE_I64,
 281
 282     TCG_TYPE_V64,
 283     TCG_TYPE_V128,
 284     TCG_TYPE_V256,
 285
 286     TCG_TYPE_COUNT, /* number of different types */
 287
 288     /* An alias for the size of the host register.  */
 289 #if TCG_TARGET_REG_BITS == 32
 290     TCG_TYPE_REG = TCG_TYPE_I32,
 291 #else
 292     TCG_TYPE_REG = TCG_TYPE_I64,
 293 #endif
 294
 295     /* An alias for the size of the native pointer.  */
 296 #if UINTPTR_MAX == UINT32_MAX
 297     TCG_TYPE_PTR = TCG_TYPE_I32,
 298 #else
 299     TCG_TYPE_PTR = TCG_TYPE_I64,
 300 #endif
 301
 302     /* An alias for the size of the target "long", aka register.  */
 303 #if TARGET_LONG_BITS == 64
 304     TCG_TYPE_TL = TCG_TYPE_I64,
 305 #else
 306     TCG_TYPE_TL = TCG_TYPE_I32,
 307 #endif
 308 } TCGType;
 309
 310 /* Constants for qemu_ld and qemu_st for the Memory Operation field.  */
 311 typedef enum TCGMemOp {
 312     MO_8     = 0,
 313     MO_16    = 1,
 314     MO_32    = 2,
 315     MO_64    = 3,
 316     MO_SIZE  = 3,   /* Mask for the above.  */
 317
 318     MO_SIGN  = 4,   /* Sign-extended, otherwise zero-extended.  */
 319
 320     MO_BSWAP = 8,   /* Host reverse endian.  */
 321 #ifdef HOST_WORDS_BIGENDIAN
 322     MO_LE    = MO_BSWAP,
 323     MO_BE    = 0,
 324 #else
 325     MO_LE    = 0,
 326     MO_BE    = MO_BSWAP,
 327 #endif
 328 #ifdef TARGET_WORDS_BIGENDIAN
 329     MO_TE    = MO_BE,
 330 #else
 331     MO_TE    = MO_LE,
 332 #endif
 333
 334     /* MO_UNALN accesses are never checked for alignment.
 335      * MO_ALIGN accesses will result in a call to the CPU's
 336      * do_unaligned_access hook if the guest address is not aligned.
 337      * The default depends on whether the target CPU defines ALIGNED_ONLY.
 338      *
 339      * Some architectures (e.g. ARMv8) need the address which is aligned
 340      * to a size more than the size of the memory access.
 341      * Some architectures (e.g. SPARCv9) need an address which is aligned,
 342      * but less strictly than the natural alignment.
 343      *
 344      * MO_ALIGN supposes the alignment size is the size of a memory access.
 345      *
 346      * There are three options:
 347      * - unaligned access permitted (MO_UNALN).
 348      * - an alignment to the size of an access (MO_ALIGN);
 349      * - an alignment to a specified size, which may be more or less than
 350      *   the access size (MO_ALIGN_x where 'x' is a size in bytes);
 351      */
 352     MO_ASHIFT = 4,
 353     MO_AMASK = 7 << MO_ASHIFT,
 354 #ifdef ALIGNED_ONLY
 355     MO_ALIGN = 0,
 356     MO_UNALN = MO_AMASK,
 357 #else
 358     MO_ALIGN = MO_AMASK,
 359     MO_UNALN = 0,
 360 #endif
 361     MO_ALIGN_2  = 1 << MO_ASHIFT,
 362     MO_ALIGN_4  = 2 << MO_ASHIFT,
 363     MO_ALIGN_8  = 3 << MO_ASHIFT,
 364     MO_ALIGN_16 = 4 << MO_ASHIFT,
 365     MO_ALIGN_32 = 5 << MO_ASHIFT,
 366     MO_ALIGN_64 = 6 << MO_ASHIFT,
 367
 368     /* Combinations of the above, for ease of use.  */
 369     MO_UB    = MO_8,
 370     MO_UW    = MO_16,
 371     MO_UL    = MO_32,
 372     MO_SB    = MO_SIGN | MO_8,
 373     MO_SW    = MO_SIGN | MO_16,
 374     MO_SL    = MO_SIGN | MO_32,
 375     MO_Q     = MO_64,
 376
 377     MO_LEUW  = MO_LE | MO_UW,
 378     MO_LEUL  = MO_LE | MO_UL,
 379     MO_LESW  = MO_LE | MO_SW,
 380     MO_LESL  = MO_LE | MO_SL,
 381     MO_LEQ   = MO_LE | MO_Q,
 382
 383     MO_BEUW  = MO_BE | MO_UW,
 384     MO_BEUL  = MO_BE | MO_UL,
 385     MO_BESW  = MO_BE | MO_SW,
 386     MO_BESL  = MO_BE | MO_SL,
 387     MO_BEQ   = MO_BE | MO_Q,
 388
 389     MO_TEUW  = MO_TE | MO_UW,
 390     MO_TEUL  = MO_TE | MO_UL,
 391     MO_TESW  = MO_TE | MO_SW,
 392     MO_TESL  = MO_TE | MO_SL,
 393     MO_TEQ   = MO_TE | MO_Q,
 394
 395     MO_SSIZE = MO_SIZE | MO_SIGN,
 396 } TCGMemOp;
 397
 398 /**
 399  * get_alignment_bits
 400  * @memop: TCGMemOp value
 401  *
 402  * Extract the alignment size from the memop.
 403  */
 404 static inline unsigned get_alignment_bits(TCGMemOp memop)
 405 {
 406     unsigned a = memop & MO_AMASK;
 407
 408     if (a == MO_UNALN) {
 409         /* No alignment required.  */
 410         a = 0;
 411     } else if (a == MO_ALIGN) {
 412         /* A natural alignment requirement.  */
 413         a = memop & MO_SIZE;
 414     } else {
 415         /* A specific alignment requirement.  */
 416         a = a >> MO_ASHIFT;
 417     }
 418 #if defined(CONFIG_SOFTMMU)
 419     /* The requested alignment cannot overlap the TLB flags.  */
 420     tcg_debug_assert((TLB_FLAGS_MASK & ((1 << a) - 1)) == 0);
 421 #endif
 422     return a;
 423 }
 424
 425 typedef tcg_target_ulong TCGArg;
 426
 427 /* Define type and accessor macros for TCG variables.
 428
 429    TCG variables are the inputs and outputs of TCG ops, as described
 430    in tcg/README. Target CPU front-end code uses these types to deal
 431    with TCG variables as it emits TCG code via the tcg_gen_* functions.
 432    They come in several flavours:
 433     * TCGv_i32 : 32 bit integer type
 434     * TCGv_i64 : 64 bit integer type
 435     * TCGv_ptr : a host pointer type
 436     * TCGv_vec : a host vector type; the exact size is not exposed
 437                  to the CPU front-end code.
 438     * TCGv : an integer type the same size as target_ulong
 439              (an alias for either TCGv_i32 or TCGv_i64)
 440    The compiler's type checking will complain if you mix them
 441    up and pass the wrong sized TCGv to a function.
 442
 443    Users of tcg_gen_* don't need to know about any of the internal
 444    details of these, and should treat them as opaque types.
 445    You won't be able to look inside them in a debugger either.
 446
 447    Internal implementation details follow:
 448
 449    Note that there is no definition of the structs TCGv_i32_d etc anywhere.
 450    This is deliberate, because the values we store in variables of type
 451    TCGv_i32 are not really pointers-to-structures. They're just small
 452    integers, but keeping them in pointer types like this means that the
 453    compiler will complain if you accidentally pass a TCGv_i32 to a
 454    function which takes a TCGv_i64, and so on. Only the internals of
 455    TCG need to care about the actual contents of the types.  */
 456
 457 typedef struct TCGv_i32_d *TCGv_i32;
 458 typedef struct TCGv_i64_d *TCGv_i64;
 459 typedef struct TCGv_ptr_d *TCGv_ptr;
 460 typedef struct TCGv_vec_d *TCGv_vec;
 461 typedef TCGv_ptr TCGv_env;
 462 #if TARGET_LONG_BITS == 32
 463 #define TCGv TCGv_i32
 464 #elif TARGET_LONG_BITS == 64
 465 #define TCGv TCGv_i64
 466 #else
 467 #error Unhandled TARGET_LONG_BITS value
 468 #endif
 469
 470 /* call flags */
 471 /* Helper does not read globals (either directly or through an exception). It
 472    implies TCG_CALL_NO_WRITE_GLOBALS. */
 473 #define TCG_CALL_NO_READ_GLOBALS    0x0001
 474 /* Helper does not write globals */
 475 #define TCG_CALL_NO_WRITE_GLOBALS   0x0002
 476 /* Helper can be safely suppressed if the return value is not used. */
 477 #define TCG_CALL_NO_SIDE_EFFECTS    0x0004
 478 /* Helper is QEMU_NORETURN.  */
 479 #define TCG_CALL_NO_RETURN          0x0008
 480
 481 /* convenience version of most used call flags */
 482 #define TCG_CALL_NO_RWG         TCG_CALL_NO_READ_GLOBALS
 483 #define TCG_CALL_NO_WG          TCG_CALL_NO_WRITE_GLOBALS
 484 #define TCG_CALL_NO_SE          TCG_CALL_NO_SIDE_EFFECTS
 485 #define TCG_CALL_NO_RWG_SE      (TCG_CALL_NO_RWG | TCG_CALL_NO_SE)
 486 #define TCG_CALL_NO_WG_SE       (TCG_CALL_NO_WG | TCG_CALL_NO_SE)
 487
 488 /* Used to align parameters.  See the comment before tcgv_i32_temp.  */
 489 #define TCG_CALL_DUMMY_ARG      ((TCGArg)0)
 490
 491 /* Conditions.  Note that these are laid out for easy manipulation by
 492    the functions below:
 493      bit 0 is used for inverting;
 494      bit 1 is signed,
 495      bit 2 is unsigned,
 496      bit 3 is used with bit 0 for swapping signed/unsigned.  */
 497 typedef enum {
 498     /* non-signed */
 499     TCG_COND_NEVER  = 0 | 0 | 0 | 0,
 500     TCG_COND_ALWAYS = 0 | 0 | 0 | 1,
 501     TCG_COND_EQ     = 8 | 0 | 0 | 0,
 502     TCG_COND_NE     = 8 | 0 | 0 | 1,
 503     /* signed */
 504     TCG_COND_LT     = 0 | 0 | 2 | 0,
 505     TCG_COND_GE     = 0 | 0 | 2 | 1,
 506     TCG_COND_LE     = 8 | 0 | 2 | 0,
 507     TCG_COND_GT     = 8 | 0 | 2 | 1,
 508     /* unsigned */
 509     TCG_COND_LTU    = 0 | 4 | 0 | 0,
 510     TCG_COND_GEU    = 0 | 4 | 0 | 1,
 511     TCG_COND_LEU    = 8 | 4 | 0 | 0,
 512     TCG_COND_GTU    = 8 | 4 | 0 | 1,
 513 } TCGCond;
 514
 515 /* Invert the sense of the comparison.  */
 516 static inline TCGCond tcg_invert_cond(TCGCond c)
 517 {
 518     return (TCGCond)(c ^ 1);
 519 }
 520
 521 /* Swap the operands in a comparison.  */
 522 static inline TCGCond tcg_swap_cond(TCGCond c)
 523 {
 524     return c & 6 ? (TCGCond)(c ^ 9) : c;
 525 }
 526
 527 /* Create an "unsigned" version of a "signed" comparison.  */
 528 static inline TCGCond tcg_unsigned_cond(TCGCond c)
 529 {
 530     return c & 2 ? (TCGCond)(c ^ 6) : c;
 531 }
 532
 533 /* Create a "signed" version of an "unsigned" comparison.  */
 534 static inline TCGCond tcg_signed_cond(TCGCond c)
 535 {
 536     return c & 4 ? (TCGCond)(c ^ 6) : c;
 537 }
 538
 539 /* Must a comparison be considered unsigned?  */
 540 static inline bool is_unsigned_cond(TCGCond c)
 541 {
 542     return (c & 4) != 0;
 543 }
 544
 545 /* Create a "high" version of a double-word comparison.
 546    This removes equality from a LTE or GTE comparison.  */
 547 static inline TCGCond tcg_high_cond(TCGCond c)
 548 {
 549     switch (c) {
 550     case TCG_COND_GE:
 551     case TCG_COND_LE:
 552     case TCG_COND_GEU:
 553     case TCG_COND_LEU:
 554         return (TCGCond)(c ^ 8);
 555     default:
 556         return c;
 557     }
 558 }
 559
 560 typedef enum TCGTempVal {
 561     TEMP_VAL_DEAD,
 562     TEMP_VAL_REG,
 563     TEMP_VAL_MEM,
 564     TEMP_VAL_CONST,
 565 } TCGTempVal;
 566
 567 typedef struct TCGTemp {
 568     TCGReg reg:8;
 569     TCGTempVal val_type:8;
 570     TCGType base_type:8;
 571     TCGType type:8;
 572     unsigned int fixed_reg:1;
 573     unsigned int indirect_reg:1;
 574     unsigned int indirect_base:1;
 575     unsigned int mem_coherent:1;
 576     unsigned int mem_allocated:1;
 577     /* If true, the temp is saved across both basic blocks and
 578        translation blocks.  */
 579     unsigned int temp_global:1;
 580     /* If true, the temp is saved across basic blocks but dead
 581        at the end of translation blocks.  If false, the temp is
 582        dead at the end of basic blocks.  */
 583     unsigned int temp_local:1;
 584     unsigned int temp_allocated:1;
 585
 586     tcg_target_long val;
 587     struct TCGTemp *mem_base;
 588     intptr_t mem_offset;
 589     const char *name;
 590
 591     /* Pass-specific information that can be stored for a temporary.
 592        One word worth of integer data, and one pointer to data
 593        allocated separately.  */
 594     uintptr_t state;
 595     void *state_ptr;
 596 } TCGTemp;
 597
 598 typedef struct TCGContext TCGContext;
 599
 600 typedef struct TCGTempSet {
 601     unsigned long l[BITS_TO_LONGS(TCG_MAX_TEMPS)];
 602 } TCGTempSet;
 603
 604 /* While we limit helpers to 6 arguments, for 32-bit hosts, with padding,
 605    this imples a max of 6*2 (64-bit in) + 2 (64-bit out) = 14 operands.
 606    There are never more than 2 outputs, which means that we can store all
 607    dead + sync data within 16 bits.  */
 608 #define DEAD_ARG  4
 609 #define SYNC_ARG  1
 610 typedef uint16_t TCGLifeData;
 611
 612 /* The layout here is designed to avoid a bitfield crossing of
 613    a 32-bit boundary, which would cause GCC to add extra padding.  */
 614 typedef struct TCGOp {
 615     TCGOpcode opc   : 8;        /*  8 */
 616
 617     /* Parameters for this opcode.  See below.  */
 618     unsigned param1 : 4;        /* 12 */
 619     unsigned param2 : 4;        /* 16 */
 620
 621     /* Lifetime data of the operands.  */
 622     unsigned life   : 16;       /* 32 */
 623
 624     /* Next and previous opcodes.  */
 625     QTAILQ_ENTRY(TCGOp) link;
 626
 627     /* Arguments for the opcode.  */
 628     TCGArg args[MAX_OPC_PARAM];
 629
 630     /* Register preferences for the output(s).  */
 631     TCGRegSet output_pref[2];
 632 } TCGOp;
 633
 634 #define TCGOP_CALLI(X)    (X)->param1
 635 #define TCGOP_CALLO(X)    (X)->param2
 636
 637 #define TCGOP_VECL(X)     (X)->param1
 638 #define TCGOP_VECE(X)     (X)->param2
 639
 640 /* Make sure operands fit in the bitfields above.  */
 641 QEMU_BUILD_BUG_ON(NB_OPS > (1 << 8));
 642
 643 typedef struct TCGProfile {
 644     int64_t cpu_exec_time;
 645     int64_t tb_count1;
 646     int64_t tb_count;
 647     int64_t op_count; /* total insn count */
 648     int op_count_max; /* max insn per TB */
 649     int temp_count_max;
 650     int64_t temp_count;
 651     int64_t del_op_count;
 652     int64_t code_in_len;
 653     int64_t code_out_len;
 654     int64_t search_out_len;
 655     int64_t interm_time;
 656     int64_t code_time;
 657     int64_t la_time;
 658     int64_t opt_time;
 659     int64_t restore_count;
 660     int64_t restore_time;
 661     int64_t table_op_count[NB_OPS];
 662 } TCGProfile;
 663
 664 struct TCGContext {
 665     uint8_t *pool_cur, *pool_end;
 666     TCGPool *pool_first, *pool_current, *pool_first_large;
 667     int nb_labels;
 668     int nb_globals;
 669     int nb_temps;
 670     int nb_indirects;
 671     int nb_ops;
 672
 673     /* goto_tb support */
 674     tcg_insn_unit *code_buf;
 675     uint16_t *tb_jmp_reset_offset; /* tb->jmp_reset_offset */
 676     uintptr_t *tb_jmp_insn_offset; /* tb->jmp_target_arg if direct_jump */
 677     uintptr_t *tb_jmp_target_addr; /* tb->jmp_target_arg if !direct_jump */
 678
 679     TCGRegSet reserved_regs;
 680     uint32_t tb_cflags; /* cflags of the current TB */
 681     intptr_t current_frame_offset;
 682     intptr_t frame_start;
 683     intptr_t frame_end;
 684     TCGTemp *frame_temp;
 685
 686     tcg_insn_unit *code_ptr;
 687
 688 #ifdef CONFIG_PROFILER
 689     TCGProfile prof;
 690 #endif
 691
 692 #ifdef CONFIG_DEBUG_TCG
 693     QSIMPLEQ_HEAD(, TCGLabel) labels;
 694     int temps_in_use;
 695     int goto_tb_issue_mask;
 696 #endif
 697
 698     /* Code generation.  Note that we specifically do not use tcg_insn_unit
 699        here, because there's too much arithmetic throughout that relies
 700        on addition and subtraction working on bytes.  Rely on the GCC
 701        extension that allows arithmetic on void*.  */
 702     void *code_gen_prologue;
 703     void *code_gen_epilogue;
 704     void *code_gen_buffer;
 705     size_t code_gen_buffer_size;
 706     void *code_gen_ptr;
 707     void *data_gen_ptr;
 708
 709     /* Threshold to flush the translated code buffer.  */
 710     void *code_gen_highwater;
 711
 712     size_t tb_phys_invalidate_count;
 713
 714     /* Track which vCPU triggers events */
 715     CPUState *cpu;                      /* *_trans */
 716
 717     /* These structures are private to tcg-target.inc.c.  */
 718 #ifdef TCG_TARGET_NEED_LDST_LABELS
 719     QSIMPLEQ_HEAD(, TCGLabelQemuLdst) ldst_labels;
 720 #endif
 721 #ifdef TCG_TARGET_NEED_POOL_LABELS
 722     struct TCGLabelPoolData *pool_labels;
 723 #endif
 724
 725     TCGLabel *exitreq_label;
 726
 727     TCGTempSet free_temps[TCG_TYPE_COUNT * 2];
 728     TCGTemp temps[TCG_MAX_TEMPS]; /* globals first, temps after */
 729
 730     QTAILQ_HEAD(, TCGOp) ops, free_ops;
 731
 732     /* Tells which temporary holds a given register.
 733        It does not take into account fixed registers */
 734     TCGTemp *reg_to_temp[TCG_TARGET_NB_REGS];
 735
 736     uint16_t gen_insn_end_off[TCG_MAX_INSNS];
 737     target_ulong gen_insn_data[TCG_MAX_INSNS][TARGET_INSN_START_WORDS];
 738 };
 739
 740 extern TCGContext tcg_init_ctx;
 741 extern __thread TCGContext *tcg_ctx;
 742 extern TCGv_env cpu_env;
 743
 744 static inline size_t temp_idx(TCGTemp *ts)
 745 {
 746     ptrdiff_t n = ts - tcg_ctx->temps;
 747     tcg_debug_assert(n >= 0 && n < tcg_ctx->nb_temps);
 748     return n;
 749 }
 750
 751 static inline TCGArg temp_arg(TCGTemp *ts)
 752 {
 753     return (uintptr_t)ts;
 754 }
 755
 756 static inline TCGTemp *arg_temp(TCGArg a)
 757 {
 758     return (TCGTemp *)(uintptr_t)a;
 759 }
 760
 761 /* Using the offset of a temporary, relative to TCGContext, rather than
 762    its index means that we don't use 0.  That leaves offset 0 free for
 763    a NULL representation without having to leave index 0 unused.  */
 764 static inline TCGTemp *tcgv_i32_temp(TCGv_i32 v)
 765 {
 766     uintptr_t o = (uintptr_t)v;
 767     TCGTemp *t = (void *)tcg_ctx + o;
 768     tcg_debug_assert(offsetof(TCGContext, temps[temp_idx(t)]) == o);
 769     return t;
 770 }
 771
 772 static inline TCGTemp *tcgv_i64_temp(TCGv_i64 v)
 773 {
 774     return tcgv_i32_temp((TCGv_i32)v);
 775 }
 776
 777 static inline TCGTemp *tcgv_ptr_temp(TCGv_ptr v)
 778 {
 779     return tcgv_i32_temp((TCGv_i32)v);
 780 }
 781
 782 static inline TCGTemp *tcgv_vec_temp(TCGv_vec v)
 783 {
 784     return tcgv_i32_temp((TCGv_i32)v);
 785 }
 786
 787 static inline TCGArg tcgv_i32_arg(TCGv_i32 v)
 788 {
 789     return temp_arg(tcgv_i32_temp(v));
 790 }
 791
 792 static inline TCGArg tcgv_i64_arg(TCGv_i64 v)
 793 {
 794     return temp_arg(tcgv_i64_temp(v));
 795 }
 796
 797 static inline TCGArg tcgv_ptr_arg(TCGv_ptr v)
 798 {
 799     return temp_arg(tcgv_ptr_temp(v));
 800 }
 801
 802 static inline TCGArg tcgv_vec_arg(TCGv_vec v)
 803 {
 804     return temp_arg(tcgv_vec_temp(v));
 805 }
 806
 807 static inline TCGv_i32 temp_tcgv_i32(TCGTemp *t)
 808 {
 809     (void)temp_idx(t); /* trigger embedded assert */
 810     return (TCGv_i32)((void *)t - (void *)tcg_ctx);
 811 }
 812
 813 static inline TCGv_i64 temp_tcgv_i64(TCGTemp *t)
 814 {
 815     return (TCGv_i64)temp_tcgv_i32(t);
 816 }
 817
 818 static inline TCGv_ptr temp_tcgv_ptr(TCGTemp *t)
 819 {
 820     return (TCGv_ptr)temp_tcgv_i32(t);
 821 }
 822
 823 static inline TCGv_vec temp_tcgv_vec(TCGTemp *t)
 824 {
 825     return (TCGv_vec)temp_tcgv_i32(t);
 826 }
 827
 828 #if TCG_TARGET_REG_BITS == 32
 829 static inline TCGv_i32 TCGV_LOW(TCGv_i64 t)
 830 {
 831     return temp_tcgv_i32(tcgv_i64_temp(t));
 832 }
 833
 834 static inline TCGv_i32 TCGV_HIGH(TCGv_i64 t)
 835 {
 836     return temp_tcgv_i32(tcgv_i64_temp(t) + 1);
 837 }
 838 #endif
 839
 840 static inline void tcg_set_insn_param(TCGOp *op, int arg, TCGArg v)
 841 {
 842     op->args[arg] = v;
 843 }
 844
 845 static inline void tcg_set_insn_start_param(TCGOp *op, int arg, target_ulong v)
 846 {
 847 #if TARGET_LONG_BITS <= TCG_TARGET_REG_BITS
 848     tcg_set_insn_param(op, arg, v);
 849 #else
 850     tcg_set_insn_param(op, arg * 2, v);
 851     tcg_set_insn_param(op, arg * 2 + 1, v >> 32);
 852 #endif
 853 }
 854
 855 /* The last op that was emitted.  */
 856 static inline TCGOp *tcg_last_op(void)
 857 {
 858     return QTAILQ_LAST(&tcg_ctx->ops);
 859 }
 860
 861 /* Test for whether to terminate the TB for using too many opcodes.  */
 862 static inline bool tcg_op_buf_full(void)
 863 {
 864     /* This is not a hard limit, it merely stops translation when
 865      * we have produced "enough" opcodes.  We want to limit TB size
 866      * such that a RISC host can reasonably use a 16-bit signed
 867      * branch within the TB.  We also need to be mindful of the
 868      * 16-bit unsigned offsets, TranslationBlock.jmp_reset_offset[]
 869      * and TCGContext.gen_insn_end_off[].
 870      */
 871     return tcg_ctx->nb_ops >= 4000;
 872 }
 873
 874 /* pool based memory allocation */
 875
 876 /* user-mode: mmap_lock must be held for tcg_malloc_internal. */
 877 void *tcg_malloc_internal(TCGContext *s, int size);
 878 void tcg_pool_reset(TCGContext *s);
 879 TranslationBlock *tcg_tb_alloc(TCGContext *s);
 880
 881 void tcg_region_init(void);
 882 void tcg_region_reset_all(void);
 883
 884 size_t tcg_code_size(void);
 885 size_t tcg_code_capacity(void);
 886
 887 void tcg_tb_insert(TranslationBlock *tb);
 888 void tcg_tb_remove(TranslationBlock *tb);
 889 size_t tcg_tb_phys_invalidate_count(void);
 890 TranslationBlock *tcg_tb_lookup(uintptr_t tc_ptr);
 891 void tcg_tb_foreach(GTraverseFunc func, gpointer user_data);
 892 size_t tcg_nb_tbs(void);
 893
 894 /* user-mode: Called with mmap_lock held.  */
 895 static inline void *tcg_malloc(int size)
 896 {
 897     TCGContext *s = tcg_ctx;
 898     uint8_t *ptr, *ptr_end;
 899
 900     /* ??? This is a weak placeholder for minimum malloc alignment.  */
 901     size = QEMU_ALIGN_UP(size, 8);
 902
 903     ptr = s->pool_cur;
 904     ptr_end = ptr + size;
 905     if (unlikely(ptr_end > s->pool_end)) {
 906         return tcg_malloc_internal(tcg_ctx, size);
 907     } else {
 908         s->pool_cur = ptr_end;
 909         return ptr;
 910     }
 911 }
 912
 913 void tcg_context_init(TCGContext *s);
 914 void tcg_register_thread(void);
 915 void tcg_prologue_init(TCGContext *s);
 916 void tcg_func_start(TCGContext *s);
 917
 918 int tcg_gen_code(TCGContext *s, TranslationBlock *tb);
 919
 920 void tcg_set_frame(TCGContext *s, TCGReg reg, intptr_t start, intptr_t size);
 921
 922 TCGTemp *tcg_global_mem_new_internal(TCGType, TCGv_ptr,
 923                                      intptr_t, const char *);
 924 TCGTemp *tcg_temp_new_internal(TCGType, bool);
 925 void tcg_temp_free_internal(TCGTemp *);
 926 TCGv_vec tcg_temp_new_vec(TCGType type);
 927 TCGv_vec tcg_temp_new_vec_matching(TCGv_vec match);
 928
 929 static inline void tcg_temp_free_i32(TCGv_i32 arg)
 930 {
 931     tcg_temp_free_internal(tcgv_i32_temp(arg));
 932 }
 933
 934 static inline void tcg_temp_free_i64(TCGv_i64 arg)
 935 {
 936     tcg_temp_free_internal(tcgv_i64_temp(arg));
 937 }
 938
 939 static inline void tcg_temp_free_ptr(TCGv_ptr arg)
 940 {
 941     tcg_temp_free_internal(tcgv_ptr_temp(arg));
 942 }
 943
 944 static inline void tcg_temp_free_vec(TCGv_vec arg)
 945 {
 946     tcg_temp_free_internal(tcgv_vec_temp(arg));
 947 }
 948
 949 static inline TCGv_i32 tcg_global_mem_new_i32(TCGv_ptr reg, intptr_t offset,
 950                                               const char *name)
 951 {
 952     TCGTemp *t = tcg_global_mem_new_internal(TCG_TYPE_I32, reg, offset, name);
 953     return temp_tcgv_i32(t);
 954 }
 955
 956 static inline TCGv_i32 tcg_temp_new_i32(void)
 957 {
 958     TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I32, false);
 959     return temp_tcgv_i32(t);
 960 }
 961
 962 static inline TCGv_i32 tcg_temp_local_new_i32(void)
 963 {
 964     TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I32, true);
 965     return temp_tcgv_i32(t);
 966 }
 967
 968 static inline TCGv_i64 tcg_global_mem_new_i64(TCGv_ptr reg, intptr_t offset,
 969                                               const char *name)
 970 {
 971     TCGTemp *t = tcg_global_mem_new_internal(TCG_TYPE_I64, reg, offset, name);
 972     return temp_tcgv_i64(t);
 973 }
 974
 975 static inline TCGv_i64 tcg_temp_new_i64(void)
 976 {
 977     TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I64, false);
 978     return temp_tcgv_i64(t);
 979 }
 980
 981 static inline TCGv_i64 tcg_temp_local_new_i64(void)
 982 {
 983     TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I64, true);
 984     return temp_tcgv_i64(t);
 985 }
 986
 987 static inline TCGv_ptr tcg_global_mem_new_ptr(TCGv_ptr reg, intptr_t offset,
 988                                               const char *name)
 989 {
 990     TCGTemp *t = tcg_global_mem_new_internal(TCG_TYPE_PTR, reg, offset, name);
 991     return temp_tcgv_ptr(t);
 992 }
 993
 994 static inline TCGv_ptr tcg_temp_new_ptr(void)
 995 {
 996     TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_PTR, false);
 997     return temp_tcgv_ptr(t);
 998 }
 999
1000 static inline TCGv_ptr tcg_temp_local_new_ptr(void)
1001 {
1002     TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_PTR, true);
1003     return temp_tcgv_ptr(t);
1004 }
1005
1006 #if defined(CONFIG_DEBUG_TCG)
1007 /* If you call tcg_clear_temp_count() at the start of a section of
1008  * code which is not supposed to leak any TCG temporaries, then
1009  * calling tcg_check_temp_count() at the end of the section will
1010  * return 1 if the section did in fact leak a temporary.
1011  */
1012 void tcg_clear_temp_count(void);
1013 int tcg_check_temp_count(void);
1014 #else
1015 #define tcg_clear_temp_count() do { } while (0)
1016 #define tcg_check_temp_count() 0
1017 #endif
1018
1019 int64_t tcg_cpu_exec_time(void);
1020 void tcg_dump_info(FILE *f, fprintf_function cpu_fprintf);
1021 void tcg_dump_op_count(FILE *f, fprintf_function cpu_fprintf);
1022
1023 #define TCG_CT_ALIAS  0x80
1024 #define TCG_CT_IALIAS 0x40
1025 #define TCG_CT_NEWREG 0x20 /* output requires a new register */
1026 #define TCG_CT_REG    0x01
1027 #define TCG_CT_CONST  0x02 /* any constant of register size */
1028
1029 typedef struct TCGArgConstraint {
1030     uint16_t ct;
1031     uint8_t alias_index;
1032     union {
1033         TCGRegSet regs;
1034     } u;
1035 } TCGArgConstraint;
1036
1037 #define TCG_MAX_OP_ARGS 16
1038
1039 /* Bits for TCGOpDef->flags, 8 bits available.  */
1040 enum {
1041     /* Instruction exits the translation block.  */
1042     TCG_OPF_BB_EXIT      = 0x01,
1043     /* Instruction defines the end of a basic block.  */
1044     TCG_OPF_BB_END       = 0x02,
1045     /* Instruction clobbers call registers and potentially update globals.  */
1046     TCG_OPF_CALL_CLOBBER = 0x04,
1047     /* Instruction has side effects: it cannot be removed if its outputs
1048        are not used, and might trigger exceptions.  */
1049     TCG_OPF_SIDE_EFFECTS = 0x08,
1050     /* Instruction operands are 64-bits (otherwise 32-bits).  */
1051     TCG_OPF_64BIT        = 0x10,
1052     /* Instruction is optional and not implemented by the host, or insn
1053        is generic and should not be implemened by the host.  */
1054     TCG_OPF_NOT_PRESENT  = 0x20,
1055     /* Instruction operands are vectors.  */
1056     TCG_OPF_VECTOR       = 0x40,
1057 };
1058
1059 typedef struct TCGOpDef {
1060     const char *name;
1061     uint8_t nb_oargs, nb_iargs, nb_cargs, nb_args;
1062     uint8_t flags;
1063     TCGArgConstraint *args_ct;
1064     int *sorted_args;
1065 #if defined(CONFIG_DEBUG_TCG)
1066     int used;
1067 #endif
1068 } TCGOpDef;
1069
1070 extern TCGOpDef tcg_op_defs[];
1071 extern const size_t tcg_op_defs_max;
1072
1073 typedef struct TCGTargetOpDef {
1074     TCGOpcode op;
1075     const char *args_ct_str[TCG_MAX_OP_ARGS];
1076 } TCGTargetOpDef;
1077
1078 #define tcg_abort() \
1079 do {\
1080     fprintf(stderr, "%s:%d: tcg fatal error\n", __FILE__, __LINE__);\
1081     abort();\
1082 } while (0)
1083
1084 bool tcg_op_supported(TCGOpcode op);
1085
1086 void tcg_gen_callN(void *func, TCGTemp *ret, int nargs, TCGTemp **args);
1087
1088 TCGOp *tcg_emit_op(TCGOpcode opc);
1089 void tcg_op_remove(TCGContext *s, TCGOp *op);
1090 TCGOp *tcg_op_insert_before(TCGContext *s, TCGOp *op, TCGOpcode opc);
1091 TCGOp *tcg_op_insert_after(TCGContext *s, TCGOp *op, TCGOpcode opc);
1092
1093 void tcg_optimize(TCGContext *s);
1094
1095 TCGv_i32 tcg_const_i32(int32_t val);
1096 TCGv_i64 tcg_const_i64(int64_t val);
1097 TCGv_i32 tcg_const_local_i32(int32_t val);
1098 TCGv_i64 tcg_const_local_i64(int64_t val);
1099 TCGv_vec tcg_const_zeros_vec(TCGType);
1100 TCGv_vec tcg_const_ones_vec(TCGType);
1101 TCGv_vec tcg_const_zeros_vec_matching(TCGv_vec);
1102 TCGv_vec tcg_const_ones_vec_matching(TCGv_vec);
1103
1104 #if UINTPTR_MAX == UINT32_MAX
1105 # define tcg_const_ptr(x)        ((TCGv_ptr)tcg_const_i32((intptr_t)(x)))
1106 # define tcg_const_local_ptr(x)  ((TCGv_ptr)tcg_const_local_i32((intptr_t)(x)))
1107 #else
1108 # define tcg_const_ptr(x)        ((TCGv_ptr)tcg_const_i64((intptr_t)(x)))
1109 # define tcg_const_local_ptr(x)  ((TCGv_ptr)tcg_const_local_i64((intptr_t)(x)))
1110 #endif
1111
1112 TCGLabel *gen_new_label(void);
1113
1114 /**
1115  * label_arg
1116  * @l: label
1117  *
1118  * Encode a label for storage in the TCG opcode stream.
1119  */
1120
1121 static inline TCGArg label_arg(TCGLabel *l)
1122 {
1123     return (uintptr_t)l;
1124 }
1125
1126 /**
1127  * arg_label
1128  * @i: value
1129  *
1130  * The opposite of label_arg.  Retrieve a label from the
1131  * encoding of the TCG opcode stream.
1132  */
1133
1134 static inline TCGLabel *arg_label(TCGArg i)
1135 {
1136     return (TCGLabel *)(uintptr_t)i;
1137 }
1138
1139 /**
1140  * tcg_ptr_byte_diff
1141  * @a, @b: addresses to be differenced
1142  *
1143  * There are many places within the TCG backends where we need a byte
1144  * difference between two pointers.  While this can be accomplished
1145  * with local casting, it's easy to get wrong -- especially if one is
1146  * concerned with the signedness of the result.
1147  *
1148  * This version relies on GCC's void pointer arithmetic to get the
1149  * correct result.
1150  */
1151
1152 static inline ptrdiff_t tcg_ptr_byte_diff(void *a, void *b)
1153 {
1154     return a - b;
1155 }
1156
1157 /**
1158  * tcg_pcrel_diff
1159  * @s: the tcg context
1160  * @target: address of the target
1161  *
1162  * Produce a pc-relative difference, from the current code_ptr
1163  * to the destination address.
1164  */
1165
1166 static inline ptrdiff_t tcg_pcrel_diff(TCGContext *s, void *target)
1167 {
1168     return tcg_ptr_byte_diff(target, s->code_ptr);
1169 }
1170
1171 /**
1172  * tcg_current_code_size
1173  * @s: the tcg context
1174  *
1175  * Compute the current code size within the translation block.
1176  * This is used to fill in qemu's data structures for goto_tb.
1177  */
1178
1179 static inline size_t tcg_current_code_size(TCGContext *s)
1180 {
1181     return tcg_ptr_byte_diff(s->code_ptr, s->code_buf);
1182 }
1183
1184 /* Combine the TCGMemOp and mmu_idx parameters into a single value.  */
1185 typedef uint32_t TCGMemOpIdx;
1186
1187 /**
1188  * make_memop_idx
1189  * @op: memory operation
1190  * @idx: mmu index
1191  *
1192  * Encode these values into a single parameter.
1193  */
1194 static inline TCGMemOpIdx make_memop_idx(TCGMemOp op, unsigned idx)
1195 {
1196     tcg_debug_assert(idx <= 15);
1197     return (op << 4) | idx;
1198 }
1199
1200 /**
1201  * get_memop
1202  * @oi: combined op/idx parameter
1203  *
1204  * Extract the memory operation from the combined value.
1205  */
1206 static inline TCGMemOp get_memop(TCGMemOpIdx oi)
1207 {
1208     return oi >> 4;
1209 }
1210
1211 /**
1212  * get_mmuidx
1213  * @oi: combined op/idx parameter
1214  *
1215  * Extract the mmu index from the combined value.
1216  */
1217 static inline unsigned get_mmuidx(TCGMemOpIdx oi)
1218 {
1219     return oi & 15;
1220 }
1221
1222 /**
1223  * tcg_qemu_tb_exec:
1224  * @env: pointer to CPUArchState for the CPU
1225  * @tb_ptr: address of generated code for the TB to execute
1226  *
1227  * Start executing code from a given translation block.
1228  * Where translation blocks have been linked, execution
1229  * may proceed from the given TB into successive ones.
1230  * Control eventually returns only when some action is needed
1231  * from the top-level loop: either control must pass to a TB
1232  * which has not yet been directly linked, or an asynchronous
1233  * event such as an interrupt needs handling.
1234  *
1235  * Return: The return value is the value passed to the corresponding
1236  * tcg_gen_exit_tb() at translation time of the last TB attempted to execute.
1237  * The value is either zero or a 4-byte aligned pointer to that TB combined
1238  * with additional information in its two least significant bits. The
1239  * additional information is encoded as follows:
1240  *  0, 1: the link between this TB and the next is via the specified
1241  *        TB index (0 or 1). That is, we left the TB via (the equivalent
1242  *        of) "goto_tb <index>". The main loop uses this to determine
1243  *        how to link the TB just executed to the next.
1244  *  2:    we are using instruction counting code generation, and we
1245  *        did not start executing this TB because the instruction counter
1246  *        would hit zero midway through it. In this case the pointer
1247  *        returned is the TB we were about to execute, and the caller must
1248  *        arrange to execute the remaining count of instructions.
1249  *  3:    we stopped because the CPU's exit_request flag was set
1250  *        (usually meaning that there is an interrupt that needs to be
1251  *        handled). The pointer returned is the TB we were about to execute
1252  *        when we noticed the pending exit request.
1253  *
1254  * If the bottom two bits indicate an exit-via-index then the CPU
1255  * state is correctly synchronised and ready for execution of the next
1256  * TB (and in particular the guest PC is the address to execute next).
1257  * Otherwise, we gave up on execution of this TB before it started, and
1258  * the caller must fix up the CPU state by calling the CPU's
1259  * synchronize_from_tb() method with the TB pointer we return (falling
1260  * back to calling the CPU's set_pc method with tb->pb if no
1261  * synchronize_from_tb() method exists).
1262  *
1263  * Note that TCG targets may use a different definition of tcg_qemu_tb_exec
1264  * to this default (which just calls the prologue.code emitted by
1265  * tcg_target_qemu_prologue()).
1266  */
1267 #define TB_EXIT_MASK      3
1268 #define TB_EXIT_IDX0      0
1269 #define TB_EXIT_IDX1      1
1270 #define TB_EXIT_IDXMAX    1
1271 #define TB_EXIT_REQUESTED 3
1272
1273 #ifdef HAVE_TCG_QEMU_TB_EXEC
1274 uintptr_t tcg_qemu_tb_exec(CPUArchState *env, uint8_t *tb_ptr);
1275 #else
1276 # define tcg_qemu_tb_exec(env, tb_ptr) \
1277     ((uintptr_t (*)(void *, void *))tcg_ctx->code_gen_prologue)(env, tb_ptr)
1278 #endif
1279
1280 void tcg_register_jit(void *buf, size_t buf_size);
1281
1282 #if TCG_TARGET_MAYBE_vec
1283 /* Return zero if the tuple (opc, type, vece) is unsupportable;
1284    return > 0 if it is directly supportable;
1285    return < 0 if we must call tcg_expand_vec_op.  */
1286 int tcg_can_emit_vec_op(TCGOpcode, TCGType, unsigned);
1287 #else
1288 static inline int tcg_can_emit_vec_op(TCGOpcode o, TCGType t, unsigned ve)
1289 {
1290     return 0;
1291 }
1292 #endif
1293
1294 /* Expand the tuple (opc, type, vece) on the given arguments.  */
1295 void tcg_expand_vec_op(TCGOpcode, TCGType, unsigned, TCGArg, ...);
1296
1297 /* Replicate a constant C accoring to the log2 of the element size.  */
1298 uint64_t dup_const(unsigned vece, uint64_t c);
1299
1300 #define dup_const(VECE, C)                                         \
1301     (__builtin_constant_p(VECE)                                    \
1302      ? (  (VECE) == MO_8  ? 0x0101010101010101ull * (uint8_t)(C)   \
1303         : (VECE) == MO_16 ? 0x0001000100010001ull * (uint16_t)(C)  \
1304         : (VECE) == MO_32 ? 0x0000000100000001ull * (uint32_t)(C)  \
1305         : dup_const(VECE, C))                                      \
1306      : dup_const(VECE, C))
1307
1308
1309 /*
1310  * Memory helpers that will be used by TCG generated code.
1311  */
1312 #ifdef CONFIG_SOFTMMU
1313 /* Value zero-extended to tcg register size.  */
1314 tcg_target_ulong helper_ret_ldub_mmu(CPUArchState *env, target_ulong addr,
1315                                      TCGMemOpIdx oi, uintptr_t retaddr);
1316 tcg_target_ulong helper_le_lduw_mmu(CPUArchState *env, target_ulong addr,
1317                                     TCGMemOpIdx oi, uintptr_t retaddr);
1318 tcg_target_ulong helper_le_ldul_mmu(CPUArchState *env, target_ulong addr,
1319                                     TCGMemOpIdx oi, uintptr_t retaddr);
1320 uint64_t helper_le_ldq_mmu(CPUArchState *env, target_ulong addr,
1321                            TCGMemOpIdx oi, uintptr_t retaddr);
1322 tcg_target_ulong helper_be_lduw_mmu(CPUArchState *env, target_ulong addr,
1323                                     TCGMemOpIdx oi, uintptr_t retaddr);
1324 tcg_target_ulong helper_be_ldul_mmu(CPUArchState *env, target_ulong addr,
1325                                     TCGMemOpIdx oi, uintptr_t retaddr);
1326 uint64_t helper_be_ldq_mmu(CPUArchState *env, target_ulong addr,
1327                            TCGMemOpIdx oi, uintptr_t retaddr);
1328
1329 /* Value sign-extended to tcg register size.  */
1330 tcg_target_ulong helper_ret_ldsb_mmu(CPUArchState *env, target_ulong addr,
1331                                      TCGMemOpIdx oi, uintptr_t retaddr);
1332 tcg_target_ulong helper_le_ldsw_mmu(CPUArchState *env, target_ulong addr,
1333                                     TCGMemOpIdx oi, uintptr_t retaddr);
1334 tcg_target_ulong helper_le_ldsl_mmu(CPUArchState *env, target_ulong addr,
1335                                     TCGMemOpIdx oi, uintptr_t retaddr);
1336 tcg_target_ulong helper_be_ldsw_mmu(CPUArchState *env, target_ulong addr,
1337                                     TCGMemOpIdx oi, uintptr_t retaddr);
1338 tcg_target_ulong helper_be_ldsl_mmu(CPUArchState *env, target_ulong addr,
1339                                     TCGMemOpIdx oi, uintptr_t retaddr);
1340
1341 void helper_ret_stb_mmu(CPUArchState *env, target_ulong addr, uint8_t val,
1342                         TCGMemOpIdx oi, uintptr_t retaddr);
1343 void helper_le_stw_mmu(CPUArchState *env, target_ulong addr, uint16_t val,
1344                        TCGMemOpIdx oi, uintptr_t retaddr);
1345 void helper_le_stl_mmu(CPUArchState *env, target_ulong addr, uint32_t val,
1346                        TCGMemOpIdx oi, uintptr_t retaddr);
1347 void helper_le_stq_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
1348                        TCGMemOpIdx oi, uintptr_t retaddr);
1349 void helper_be_stw_mmu(CPUArchState *env, target_ulong addr, uint16_t val,
1350                        TCGMemOpIdx oi, uintptr_t retaddr);
1351 void helper_be_stl_mmu(CPUArchState *env, target_ulong addr, uint32_t val,
1352                        TCGMemOpIdx oi, uintptr_t retaddr);
1353 void helper_be_stq_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
1354                        TCGMemOpIdx oi, uintptr_t retaddr);
1355
1356 uint8_t helper_ret_ldb_cmmu(CPUArchState *env, target_ulong addr,
1357                             TCGMemOpIdx oi, uintptr_t retaddr);
1358 uint16_t helper_le_ldw_cmmu(CPUArchState *env, target_ulong addr,
1359                             TCGMemOpIdx oi, uintptr_t retaddr);
1360 uint32_t helper_le_ldl_cmmu(CPUArchState *env, target_ulong addr,
1361                             TCGMemOpIdx oi, uintptr_t retaddr);
1362 uint64_t helper_le_ldq_cmmu(CPUArchState *env, target_ulong addr,
1363                             TCGMemOpIdx oi, uintptr_t retaddr);
1364 uint16_t helper_be_ldw_cmmu(CPUArchState *env, target_ulong addr,
1365                             TCGMemOpIdx oi, uintptr_t retaddr);
1366 uint32_t helper_be_ldl_cmmu(CPUArchState *env, target_ulong addr,
1367                             TCGMemOpIdx oi, uintptr_t retaddr);
1368 uint64_t helper_be_ldq_cmmu(CPUArchState *env, target_ulong addr,
1369                             TCGMemOpIdx oi, uintptr_t retaddr);
1370
1371 /* Temporary aliases until backends are converted.  */
1372 #ifdef TARGET_WORDS_BIGENDIAN
1373 # define helper_ret_ldsw_mmu  helper_be_ldsw_mmu
1374 # define helper_ret_lduw_mmu  helper_be_lduw_mmu
1375 # define helper_ret_ldsl_mmu  helper_be_ldsl_mmu
1376 # define helper_ret_ldul_mmu  helper_be_ldul_mmu
1377 # define helper_ret_ldl_mmu   helper_be_ldul_mmu
1378 # define helper_ret_ldq_mmu   helper_be_ldq_mmu
1379 # define helper_ret_stw_mmu   helper_be_stw_mmu
1380 # define helper_ret_stl_mmu   helper_be_stl_mmu
1381 # define helper_ret_stq_mmu   helper_be_stq_mmu
1382 # define helper_ret_ldw_cmmu  helper_be_ldw_cmmu
1383 # define helper_ret_ldl_cmmu  helper_be_ldl_cmmu
1384 # define helper_ret_ldq_cmmu  helper_be_ldq_cmmu
1385 #else
1386 # define helper_ret_ldsw_mmu  helper_le_ldsw_mmu
1387 # define helper_ret_lduw_mmu  helper_le_lduw_mmu
1388 # define helper_ret_ldsl_mmu  helper_le_ldsl_mmu
1389 # define helper_ret_ldul_mmu  helper_le_ldul_mmu
1390 # define helper_ret_ldl_mmu   helper_le_ldul_mmu
1391 # define helper_ret_ldq_mmu   helper_le_ldq_mmu
1392 # define helper_ret_stw_mmu   helper_le_stw_mmu
1393 # define helper_ret_stl_mmu   helper_le_stl_mmu
1394 # define helper_ret_stq_mmu   helper_le_stq_mmu
1395 # define helper_ret_ldw_cmmu  helper_le_ldw_cmmu
1396 # define helper_ret_ldl_cmmu  helper_le_ldl_cmmu
1397 # define helper_ret_ldq_cmmu  helper_le_ldq_cmmu
1398 #endif
1399
1400 uint32_t helper_atomic_cmpxchgb_mmu(CPUArchState *env, target_ulong addr,
1401                                     uint32_t cmpv, uint32_t newv,
1402                                     TCGMemOpIdx oi, uintptr_t retaddr);
1403 uint32_t helper_atomic_cmpxchgw_le_mmu(CPUArchState *env, target_ulong addr,
1404                                        uint32_t cmpv, uint32_t newv,
1405                                        TCGMemOpIdx oi, uintptr_t retaddr);
1406 uint32_t helper_atomic_cmpxchgl_le_mmu(CPUArchState *env, target_ulong addr,
1407                                        uint32_t cmpv, uint32_t newv,
1408                                        TCGMemOpIdx oi, uintptr_t retaddr);
1409 uint64_t helper_atomic_cmpxchgq_le_mmu(CPUArchState *env, target_ulong addr,
1410                                        uint64_t cmpv, uint64_t newv,
1411                                        TCGMemOpIdx oi, uintptr_t retaddr);
1412 uint32_t helper_atomic_cmpxchgw_be_mmu(CPUArchState *env, target_ulong addr,
1413                                        uint32_t cmpv, uint32_t newv,
1414                                        TCGMemOpIdx oi, uintptr_t retaddr);
1415 uint32_t helper_atomic_cmpxchgl_be_mmu(CPUArchState *env, target_ulong addr,
1416                                        uint32_t cmpv, uint32_t newv,
1417                                        TCGMemOpIdx oi, uintptr_t retaddr);
1418 uint64_t helper_atomic_cmpxchgq_be_mmu(CPUArchState *env, target_ulong addr,
1419                                        uint64_t cmpv, uint64_t newv,
1420                                        TCGMemOpIdx oi, uintptr_t retaddr);
1421
1422 #define GEN_ATOMIC_HELPER(NAME, TYPE, SUFFIX)         \
1423 TYPE helper_atomic_ ## NAME ## SUFFIX ## _mmu         \
1424     (CPUArchState *env, target_ulong addr, TYPE val,  \
1425      TCGMemOpIdx oi, uintptr_t retaddr);
1426
1427 #ifdef CONFIG_ATOMIC64
1428 #define GEN_ATOMIC_HELPER_ALL(NAME)          \
1429     GEN_ATOMIC_HELPER(NAME, uint32_t, b)     \
1430     GEN_ATOMIC_HELPER(NAME, uint32_t, w_le)  \
1431     GEN_ATOMIC_HELPER(NAME, uint32_t, w_be)  \
1432     GEN_ATOMIC_HELPER(NAME, uint32_t, l_le)  \
1433     GEN_ATOMIC_HELPER(NAME, uint32_t, l_be)  \
1434     GEN_ATOMIC_HELPER(NAME, uint64_t, q_le)  \
1435     GEN_ATOMIC_HELPER(NAME, uint64_t, q_be)
1436 #else
1437 #define GEN_ATOMIC_HELPER_ALL(NAME)          \
1438     GEN_ATOMIC_HELPER(NAME, uint32_t, b)     \
1439     GEN_ATOMIC_HELPER(NAME, uint32_t, w_le)  \
1440     GEN_ATOMIC_HELPER(NAME, uint32_t, w_be)  \
1441     GEN_ATOMIC_HELPER(NAME, uint32_t, l_le)  \
1442     GEN_ATOMIC_HELPER(NAME, uint32_t, l_be)
1443 #endif
1444
1445 GEN_ATOMIC_HELPER_ALL(fetch_add)
1446 GEN_ATOMIC_HELPER_ALL(fetch_sub)
1447 GEN_ATOMIC_HELPER_ALL(fetch_and)
1448 GEN_ATOMIC_HELPER_ALL(fetch_or)
1449 GEN_ATOMIC_HELPER_ALL(fetch_xor)
1450 GEN_ATOMIC_HELPER_ALL(fetch_smin)
1451 GEN_ATOMIC_HELPER_ALL(fetch_umin)
1452 GEN_ATOMIC_HELPER_ALL(fetch_smax)
1453 GEN_ATOMIC_HELPER_ALL(fetch_umax)
1454
1455 GEN_ATOMIC_HELPER_ALL(add_fetch)
1456 GEN_ATOMIC_HELPER_ALL(sub_fetch)
1457 GEN_ATOMIC_HELPER_ALL(and_fetch)
1458 GEN_ATOMIC_HELPER_ALL(or_fetch)
1459 GEN_ATOMIC_HELPER_ALL(xor_fetch)
1460 GEN_ATOMIC_HELPER_ALL(smin_fetch)
1461 GEN_ATOMIC_HELPER_ALL(umin_fetch)
1462 GEN_ATOMIC_HELPER_ALL(smax_fetch)
1463 GEN_ATOMIC_HELPER_ALL(umax_fetch)
1464
1465 GEN_ATOMIC_HELPER_ALL(xchg)
1466
1467 #undef GEN_ATOMIC_HELPER_ALL
1468 #undef GEN_ATOMIC_HELPER
1469 #endif /* CONFIG_SOFTMMU */
1470
1471 /*
1472  * These aren't really a "proper" helpers because TCG cannot manage Int128.
1473  * However, use the same format as the others, for use by the backends.
1474  *
1475  * The cmpxchg functions are only defined if HAVE_CMPXCHG128;
1476  * the ld/st functions are only defined if HAVE_ATOMIC128,
1477  * as defined by <qemu/atomic128.h>.
1478  */
1479 Int128 helper_atomic_cmpxchgo_le_mmu(CPUArchState *env, target_ulong addr,
1480                                      Int128 cmpv, Int128 newv,
1481                                      TCGMemOpIdx oi, uintptr_t retaddr);
1482 Int128 helper_atomic_cmpxchgo_be_mmu(CPUArchState *env, target_ulong addr,
1483                                      Int128 cmpv, Int128 newv,
1484                                      TCGMemOpIdx oi, uintptr_t retaddr);
1485
1486 Int128 helper_atomic_ldo_le_mmu(CPUArchState *env, target_ulong addr,
1487                                 TCGMemOpIdx oi, uintptr_t retaddr);
1488 Int128 helper_atomic_ldo_be_mmu(CPUArchState *env, target_ulong addr,
1489                                 TCGMemOpIdx oi, uintptr_t retaddr);
1490 void helper_atomic_sto_le_mmu(CPUArchState *env, target_ulong addr, Int128 val,
1491                               TCGMemOpIdx oi, uintptr_t retaddr);
1492 void helper_atomic_sto_be_mmu(CPUArchState *env, target_ulong addr, Int128 val,
1493                               TCGMemOpIdx oi, uintptr_t retaddr);
1494
1495 #endif /* TCG_H */