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
  36 /* XXX: make safe guess about sizes */
  37 #define MAX_OP_PER_INSTR 266
  38
  39 #if HOST_LONG_BITS == 32
  40 #define MAX_OPC_PARAM_PER_ARG 2
  41 #else
  42 #define MAX_OPC_PARAM_PER_ARG 1
  43 #endif
  44 #define MAX_OPC_PARAM_IARGS 6
  45 #define MAX_OPC_PARAM_OARGS 1
  46 #define MAX_OPC_PARAM_ARGS (MAX_OPC_PARAM_IARGS + MAX_OPC_PARAM_OARGS)
  47
  48 /* A Call op needs up to 4 + 2N parameters on 32-bit archs,
  49  * and up to 4 + N parameters on 64-bit archs
  50  * (N = number of input arguments + output arguments).  */
  51 #define MAX_OPC_PARAM (4 + (MAX_OPC_PARAM_PER_ARG * MAX_OPC_PARAM_ARGS))
  52
  53 #define CPU_TEMP_BUF_NLONGS 128
  54
  55 /* Default target word size to pointer size.  */
  56 #ifndef TCG_TARGET_REG_BITS
  57 # if UINTPTR_MAX == UINT32_MAX
  58 #  define TCG_TARGET_REG_BITS 32
  59 # elif UINTPTR_MAX == UINT64_MAX
  60 #  define TCG_TARGET_REG_BITS 64
  61 # else
  62 #  error Unknown pointer size for tcg target
  63 # endif
  64 #endif
  65
  66 #if TCG_TARGET_REG_BITS == 32
  67 typedef int32_t tcg_target_long;
  68 typedef uint32_t tcg_target_ulong;
  69 #define TCG_PRIlx PRIx32
  70 #define TCG_PRIld PRId32
  71 #elif TCG_TARGET_REG_BITS == 64
  72 typedef int64_t tcg_target_long;
  73 typedef uint64_t tcg_target_ulong;
  74 #define TCG_PRIlx PRIx64
  75 #define TCG_PRIld PRId64
  76 #else
  77 #error unsupported
  78 #endif
  79
  80 /* Oversized TCG guests make things like MTTCG hard
  81  * as we can't use atomics for cputlb updates.
  82  */
  83 #if TARGET_LONG_BITS > TCG_TARGET_REG_BITS
  84 #define TCG_OVERSIZED_GUEST 1
  85 #else
  86 #define TCG_OVERSIZED_GUEST 0
  87 #endif
  88
  89 #if TCG_TARGET_NB_REGS <= 32
  90 typedef uint32_t TCGRegSet;
  91 #elif TCG_TARGET_NB_REGS <= 64
  92 typedef uint64_t TCGRegSet;
  93 #else
  94 #error unsupported
  95 #endif
  96
  97 #if TCG_TARGET_REG_BITS == 32
  98 /* Turn some undef macros into false macros.  */
  99 #define TCG_TARGET_HAS_extrl_i64_i32    0
 100 #define TCG_TARGET_HAS_extrh_i64_i32    0
 101 #define TCG_TARGET_HAS_div_i64          0
 102 #define TCG_TARGET_HAS_rem_i64          0
 103 #define TCG_TARGET_HAS_div2_i64         0
 104 #define TCG_TARGET_HAS_rot_i64          0
 105 #define TCG_TARGET_HAS_ext8s_i64        0
 106 #define TCG_TARGET_HAS_ext16s_i64       0
 107 #define TCG_TARGET_HAS_ext32s_i64       0
 108 #define TCG_TARGET_HAS_ext8u_i64        0
 109 #define TCG_TARGET_HAS_ext16u_i64       0
 110 #define TCG_TARGET_HAS_ext32u_i64       0
 111 #define TCG_TARGET_HAS_bswap16_i64      0
 112 #define TCG_TARGET_HAS_bswap32_i64      0
 113 #define TCG_TARGET_HAS_bswap64_i64      0
 114 #define TCG_TARGET_HAS_neg_i64          0
 115 #define TCG_TARGET_HAS_not_i64          0
 116 #define TCG_TARGET_HAS_andc_i64         0
 117 #define TCG_TARGET_HAS_orc_i64          0
 118 #define TCG_TARGET_HAS_eqv_i64          0
 119 #define TCG_TARGET_HAS_nand_i64         0
 120 #define TCG_TARGET_HAS_nor_i64          0
 121 #define TCG_TARGET_HAS_clz_i64          0
 122 #define TCG_TARGET_HAS_ctz_i64          0
 123 #define TCG_TARGET_HAS_ctpop_i64        0
 124 #define TCG_TARGET_HAS_deposit_i64      0
 125 #define TCG_TARGET_HAS_extract_i64      0
 126 #define TCG_TARGET_HAS_sextract_i64     0
 127 #define TCG_TARGET_HAS_movcond_i64      0
 128 #define TCG_TARGET_HAS_add2_i64         0
 129 #define TCG_TARGET_HAS_sub2_i64         0
 130 #define TCG_TARGET_HAS_mulu2_i64        0
 131 #define TCG_TARGET_HAS_muls2_i64        0
 132 #define TCG_TARGET_HAS_muluh_i64        0
 133 #define TCG_TARGET_HAS_mulsh_i64        0
 134 /* Turn some undef macros into true macros.  */
 135 #define TCG_TARGET_HAS_add2_i32         1
 136 #define TCG_TARGET_HAS_sub2_i32         1
 137 #endif
 138
 139 #ifndef TCG_TARGET_deposit_i32_valid
 140 #define TCG_TARGET_deposit_i32_valid(ofs, len) 1
 141 #endif
 142 #ifndef TCG_TARGET_deposit_i64_valid
 143 #define TCG_TARGET_deposit_i64_valid(ofs, len) 1
 144 #endif
 145 #ifndef TCG_TARGET_extract_i32_valid
 146 #define TCG_TARGET_extract_i32_valid(ofs, len) 1
 147 #endif
 148 #ifndef TCG_TARGET_extract_i64_valid
 149 #define TCG_TARGET_extract_i64_valid(ofs, len) 1
 150 #endif
 151
 152 /* Only one of DIV or DIV2 should be defined.  */
 153 #if defined(TCG_TARGET_HAS_div_i32)
 154 #define TCG_TARGET_HAS_div2_i32         0
 155 #elif defined(TCG_TARGET_HAS_div2_i32)
 156 #define TCG_TARGET_HAS_div_i32          0
 157 #define TCG_TARGET_HAS_rem_i32          0
 158 #endif
 159 #if defined(TCG_TARGET_HAS_div_i64)
 160 #define TCG_TARGET_HAS_div2_i64         0
 161 #elif defined(TCG_TARGET_HAS_div2_i64)
 162 #define TCG_TARGET_HAS_div_i64          0
 163 #define TCG_TARGET_HAS_rem_i64          0
 164 #endif
 165
 166 /* For 32-bit targets, some sort of unsigned widening multiply is required.  */
 167 #if TCG_TARGET_REG_BITS == 32 \
 168     && !(defined(TCG_TARGET_HAS_mulu2_i32) \
 169          || defined(TCG_TARGET_HAS_muluh_i32))
 170 # error "Missing unsigned widening multiply"
 171 #endif
 172
 173 #if !defined(TCG_TARGET_HAS_v64) \
 174     && !defined(TCG_TARGET_HAS_v128) \
 175     && !defined(TCG_TARGET_HAS_v256)
 176 #define TCG_TARGET_MAYBE_vec            0
 177 #define TCG_TARGET_HAS_neg_vec          0
 178 #define TCG_TARGET_HAS_not_vec          0
 179 #define TCG_TARGET_HAS_andc_vec         0
 180 #define TCG_TARGET_HAS_orc_vec          0
 181 #define TCG_TARGET_HAS_shi_vec          0
 182 #define TCG_TARGET_HAS_shs_vec          0
 183 #define TCG_TARGET_HAS_shv_vec          0
 184 #define TCG_TARGET_HAS_mul_vec          0
 185 #else
 186 #define TCG_TARGET_MAYBE_vec            1
 187 #endif
 188 #ifndef TCG_TARGET_HAS_v64
 189 #define TCG_TARGET_HAS_v64              0
 190 #endif
 191 #ifndef TCG_TARGET_HAS_v128
 192 #define TCG_TARGET_HAS_v128             0
 193 #endif
 194 #ifndef TCG_TARGET_HAS_v256
 195 #define TCG_TARGET_HAS_v256             0
 196 #endif
 197
 198 #ifndef TARGET_INSN_START_EXTRA_WORDS
 199 # define TARGET_INSN_START_WORDS 1
 200 #else
 201 # define TARGET_INSN_START_WORDS (1 + TARGET_INSN_START_EXTRA_WORDS)
 202 #endif
 203
 204 typedef enum TCGOpcode {
 205 #define DEF(name, oargs, iargs, cargs, flags) INDEX_op_ ## name,
 206 #include "tcg-opc.h"
 207 #undef DEF
 208     NB_OPS,
 209 } TCGOpcode;
 210
 211 #define tcg_regset_set_reg(d, r)   ((d) |= (TCGRegSet)1 << (r))
 212 #define tcg_regset_reset_reg(d, r) ((d) &= ~((TCGRegSet)1 << (r)))
 213 #define tcg_regset_test_reg(d, r)  (((d) >> (r)) & 1)
 214
 215 #ifndef TCG_TARGET_INSN_UNIT_SIZE
 216 # error "Missing TCG_TARGET_INSN_UNIT_SIZE"
 217 #elif TCG_TARGET_INSN_UNIT_SIZE == 1
 218 typedef uint8_t tcg_insn_unit;
 219 #elif TCG_TARGET_INSN_UNIT_SIZE == 2
 220 typedef uint16_t tcg_insn_unit;
 221 #elif TCG_TARGET_INSN_UNIT_SIZE == 4
 222 typedef uint32_t tcg_insn_unit;
 223 #elif TCG_TARGET_INSN_UNIT_SIZE == 8
 224 typedef uint64_t tcg_insn_unit;
 225 #else
 226 /* The port better have done this.  */
 227 #endif
 228
 229
 230 #if defined CONFIG_DEBUG_TCG || defined QEMU_STATIC_ANALYSIS
 231 # define tcg_debug_assert(X) do { assert(X); } while (0)
 232 #elif QEMU_GNUC_PREREQ(4, 5)
 233 # define tcg_debug_assert(X) \
 234     do { if (!(X)) { __builtin_unreachable(); } } while (0)
 235 #else
 236 # define tcg_debug_assert(X) do { (void)(X); } while (0)
 237 #endif
 238
 239 typedef struct TCGRelocation {
 240     struct TCGRelocation *next;
 241     int type;
 242     tcg_insn_unit *ptr;
 243     intptr_t addend;
 244 } TCGRelocation;
 245
 246 typedef struct TCGLabel {
 247     unsigned has_value : 1;
 248     unsigned id : 31;
 249     union {
 250         uintptr_t value;
 251         tcg_insn_unit *value_ptr;
 252         TCGRelocation *first_reloc;
 253     } u;
 254 } TCGLabel;
 255
 256 typedef struct TCGPool {
 257     struct TCGPool *next;
 258     int size;
 259     uint8_t data[0] __attribute__ ((aligned));
 260 } TCGPool;
 261
 262 #define TCG_POOL_CHUNK_SIZE 32768
 263
 264 #define TCG_MAX_TEMPS 512
 265 #define TCG_MAX_INSNS 512
 266
 267 /* when the size of the arguments of a called function is smaller than
 268    this value, they are statically allocated in the TB stack frame */
 269 #define TCG_STATIC_CALL_ARGS_SIZE 128
 270
 271 typedef enum TCGType {
 272     TCG_TYPE_I32,
 273     TCG_TYPE_I64,
 274
 275     TCG_TYPE_V64,
 276     TCG_TYPE_V128,
 277     TCG_TYPE_V256,
 278
 279     TCG_TYPE_COUNT, /* number of different types */
 280
 281     /* An alias for the size of the host register.  */
 282 #if TCG_TARGET_REG_BITS == 32
 283     TCG_TYPE_REG = TCG_TYPE_I32,
 284 #else
 285     TCG_TYPE_REG = TCG_TYPE_I64,
 286 #endif
 287
 288     /* An alias for the size of the native pointer.  */
 289 #if UINTPTR_MAX == UINT32_MAX
 290     TCG_TYPE_PTR = TCG_TYPE_I32,
 291 #else
 292     TCG_TYPE_PTR = TCG_TYPE_I64,
 293 #endif
 294
 295     /* An alias for the size of the target "long", aka register.  */
 296 #if TARGET_LONG_BITS == 64
 297     TCG_TYPE_TL = TCG_TYPE_I64,
 298 #else
 299     TCG_TYPE_TL = TCG_TYPE_I32,
 300 #endif
 301 } TCGType;
 302
 303 /* Constants for qemu_ld and qemu_st for the Memory Operation field.  */
 304 typedef enum TCGMemOp {
 305     MO_8     = 0,
 306     MO_16    = 1,
 307     MO_32    = 2,
 308     MO_64    = 3,
 309     MO_SIZE  = 3,   /* Mask for the above.  */
 310
 311     MO_SIGN  = 4,   /* Sign-extended, otherwise zero-extended.  */
 312
 313     MO_BSWAP = 8,   /* Host reverse endian.  */
 314 #ifdef HOST_WORDS_BIGENDIAN
 315     MO_LE    = MO_BSWAP,
 316     MO_BE    = 0,
 317 #else
 318     MO_LE    = 0,
 319     MO_BE    = MO_BSWAP,
 320 #endif
 321 #ifdef TARGET_WORDS_BIGENDIAN
 322     MO_TE    = MO_BE,
 323 #else
 324     MO_TE    = MO_LE,
 325 #endif
 326
 327     /* MO_UNALN accesses are never checked for alignment.
 328      * MO_ALIGN accesses will result in a call to the CPU's
 329      * do_unaligned_access hook if the guest address is not aligned.
 330      * The default depends on whether the target CPU defines ALIGNED_ONLY.
 331      *
 332      * Some architectures (e.g. ARMv8) need the address which is aligned
 333      * to a size more than the size of the memory access.
 334      * Some architectures (e.g. SPARCv9) need an address which is aligned,
 335      * but less strictly than the natural alignment.
 336      *
 337      * MO_ALIGN supposes the alignment size is the size of a memory access.
 338      *
 339      * There are three options:
 340      * - unaligned access permitted (MO_UNALN).
 341      * - an alignment to the size of an access (MO_ALIGN);
 342      * - an alignment to a specified size, which may be more or less than
 343      *   the access size (MO_ALIGN_x where 'x' is a size in bytes);
 344      */
 345     MO_ASHIFT = 4,
 346     MO_AMASK = 7 << MO_ASHIFT,
 347 #ifdef ALIGNED_ONLY
 348     MO_ALIGN = 0,
 349     MO_UNALN = MO_AMASK,
 350 #else
 351     MO_ALIGN = MO_AMASK,
 352     MO_UNALN = 0,
 353 #endif
 354     MO_ALIGN_2  = 1 << MO_ASHIFT,
 355     MO_ALIGN_4  = 2 << MO_ASHIFT,
 356     MO_ALIGN_8  = 3 << MO_ASHIFT,
 357     MO_ALIGN_16 = 4 << MO_ASHIFT,
 358     MO_ALIGN_32 = 5 << MO_ASHIFT,
 359     MO_ALIGN_64 = 6 << MO_ASHIFT,
 360
 361     /* Combinations of the above, for ease of use.  */
 362     MO_UB    = MO_8,
 363     MO_UW    = MO_16,
 364     MO_UL    = MO_32,
 365     MO_SB    = MO_SIGN | MO_8,
 366     MO_SW    = MO_SIGN | MO_16,
 367     MO_SL    = MO_SIGN | MO_32,
 368     MO_Q     = MO_64,
 369
 370     MO_LEUW  = MO_LE | MO_UW,
 371     MO_LEUL  = MO_LE | MO_UL,
 372     MO_LESW  = MO_LE | MO_SW,
 373     MO_LESL  = MO_LE | MO_SL,
 374     MO_LEQ   = MO_LE | MO_Q,
 375
 376     MO_BEUW  = MO_BE | MO_UW,
 377     MO_BEUL  = MO_BE | MO_UL,
 378     MO_BESW  = MO_BE | MO_SW,
 379     MO_BESL  = MO_BE | MO_SL,
 380     MO_BEQ   = MO_BE | MO_Q,
 381
 382     MO_TEUW  = MO_TE | MO_UW,
 383     MO_TEUL  = MO_TE | MO_UL,
 384     MO_TESW  = MO_TE | MO_SW,
 385     MO_TESL  = MO_TE | MO_SL,
 386     MO_TEQ   = MO_TE | MO_Q,
 387
 388     MO_SSIZE = MO_SIZE | MO_SIGN,
 389 } TCGMemOp;
 390
 391 /**
 392  * get_alignment_bits
 393  * @memop: TCGMemOp value
 394  *
 395  * Extract the alignment size from the memop.
 396  */
 397 static inline unsigned get_alignment_bits(TCGMemOp memop)
 398 {
 399     unsigned a = memop & MO_AMASK;
 400
 401     if (a == MO_UNALN) {
 402         /* No alignment required.  */
 403         a = 0;
 404     } else if (a == MO_ALIGN) {
 405         /* A natural alignment requirement.  */
 406         a = memop & MO_SIZE;
 407     } else {
 408         /* A specific alignment requirement.  */
 409         a = a >> MO_ASHIFT;
 410     }
 411 #if defined(CONFIG_SOFTMMU)
 412     /* The requested alignment cannot overlap the TLB flags.  */
 413     tcg_debug_assert((TLB_FLAGS_MASK & ((1 << a) - 1)) == 0);
 414 #endif
 415     return a;
 416 }
 417
 418 typedef tcg_target_ulong TCGArg;
 419
 420 /* Define type and accessor macros for TCG variables.
 421
 422    TCG variables are the inputs and outputs of TCG ops, as described
 423    in tcg/README. Target CPU front-end code uses these types to deal
 424    with TCG variables as it emits TCG code via the tcg_gen_* functions.
 425    They come in several flavours:
 426     * TCGv_i32 : 32 bit integer type
 427     * TCGv_i64 : 64 bit integer type
 428     * TCGv_ptr : a host pointer type
 429     * TCGv_vec : a host vector type; the exact size is not exposed
 430                  to the CPU front-end code.
 431     * TCGv : an integer type the same size as target_ulong
 432              (an alias for either TCGv_i32 or TCGv_i64)
 433    The compiler's type checking will complain if you mix them
 434    up and pass the wrong sized TCGv to a function.
 435
 436    Users of tcg_gen_* don't need to know about any of the internal
 437    details of these, and should treat them as opaque types.
 438    You won't be able to look inside them in a debugger either.
 439
 440    Internal implementation details follow:
 441
 442    Note that there is no definition of the structs TCGv_i32_d etc anywhere.
 443    This is deliberate, because the values we store in variables of type
 444    TCGv_i32 are not really pointers-to-structures. They're just small
 445    integers, but keeping them in pointer types like this means that the
 446    compiler will complain if you accidentally pass a TCGv_i32 to a
 447    function which takes a TCGv_i64, and so on. Only the internals of
 448    TCG need to care about the actual contents of the types.  */
 449
 450 typedef struct TCGv_i32_d *TCGv_i32;
 451 typedef struct TCGv_i64_d *TCGv_i64;
 452 typedef struct TCGv_ptr_d *TCGv_ptr;
 453 typedef struct TCGv_vec_d *TCGv_vec;
 454 typedef TCGv_ptr TCGv_env;
 455 #if TARGET_LONG_BITS == 32
 456 #define TCGv TCGv_i32
 457 #elif TARGET_LONG_BITS == 64
 458 #define TCGv TCGv_i64
 459 #else
 460 #error Unhandled TARGET_LONG_BITS value
 461 #endif
 462
 463 /* call flags */
 464 /* Helper does not read globals (either directly or through an exception). It
 465    implies TCG_CALL_NO_WRITE_GLOBALS. */
 466 #define TCG_CALL_NO_READ_GLOBALS    0x0010
 467 /* Helper does not write globals */
 468 #define TCG_CALL_NO_WRITE_GLOBALS   0x0020
 469 /* Helper can be safely suppressed if the return value is not used. */
 470 #define TCG_CALL_NO_SIDE_EFFECTS    0x0040
 471
 472 /* convenience version of most used call flags */
 473 #define TCG_CALL_NO_RWG         TCG_CALL_NO_READ_GLOBALS
 474 #define TCG_CALL_NO_WG          TCG_CALL_NO_WRITE_GLOBALS
 475 #define TCG_CALL_NO_SE          TCG_CALL_NO_SIDE_EFFECTS
 476 #define TCG_CALL_NO_RWG_SE      (TCG_CALL_NO_RWG | TCG_CALL_NO_SE)
 477 #define TCG_CALL_NO_WG_SE       (TCG_CALL_NO_WG | TCG_CALL_NO_SE)
 478
 479 /* Used to align parameters.  See the comment before tcgv_i32_temp.  */
 480 #define TCG_CALL_DUMMY_ARG      ((TCGArg)0)
 481
 482 /* Conditions.  Note that these are laid out for easy manipulation by
 483    the functions below:
 484      bit 0 is used for inverting;
 485      bit 1 is signed,
 486      bit 2 is unsigned,
 487      bit 3 is used with bit 0 for swapping signed/unsigned.  */
 488 typedef enum {
 489     /* non-signed */
 490     TCG_COND_NEVER  = 0 | 0 | 0 | 0,
 491     TCG_COND_ALWAYS = 0 | 0 | 0 | 1,
 492     TCG_COND_EQ     = 8 | 0 | 0 | 0,
 493     TCG_COND_NE     = 8 | 0 | 0 | 1,
 494     /* signed */
 495     TCG_COND_LT     = 0 | 0 | 2 | 0,
 496     TCG_COND_GE     = 0 | 0 | 2 | 1,
 497     TCG_COND_LE     = 8 | 0 | 2 | 0,
 498     TCG_COND_GT     = 8 | 0 | 2 | 1,
 499     /* unsigned */
 500     TCG_COND_LTU    = 0 | 4 | 0 | 0,
 501     TCG_COND_GEU    = 0 | 4 | 0 | 1,
 502     TCG_COND_LEU    = 8 | 4 | 0 | 0,
 503     TCG_COND_GTU    = 8 | 4 | 0 | 1,
 504 } TCGCond;
 505
 506 /* Invert the sense of the comparison.  */
 507 static inline TCGCond tcg_invert_cond(TCGCond c)
 508 {
 509     return (TCGCond)(c ^ 1);
 510 }
 511
 512 /* Swap the operands in a comparison.  */
 513 static inline TCGCond tcg_swap_cond(TCGCond c)
 514 {
 515     return c & 6 ? (TCGCond)(c ^ 9) : c;
 516 }
 517
 518 /* Create an "unsigned" version of a "signed" comparison.  */
 519 static inline TCGCond tcg_unsigned_cond(TCGCond c)
 520 {
 521     return c & 2 ? (TCGCond)(c ^ 6) : c;
 522 }
 523
 524 /* Create a "signed" version of an "unsigned" comparison.  */
 525 static inline TCGCond tcg_signed_cond(TCGCond c)
 526 {
 527     return c & 4 ? (TCGCond)(c ^ 6) : c;
 528 }
 529
 530 /* Must a comparison be considered unsigned?  */
 531 static inline bool is_unsigned_cond(TCGCond c)
 532 {
 533     return (c & 4) != 0;
 534 }
 535
 536 /* Create a "high" version of a double-word comparison.
 537    This removes equality from a LTE or GTE comparison.  */
 538 static inline TCGCond tcg_high_cond(TCGCond c)
 539 {
 540     switch (c) {
 541     case TCG_COND_GE:
 542     case TCG_COND_LE:
 543     case TCG_COND_GEU:
 544     case TCG_COND_LEU:
 545         return (TCGCond)(c ^ 8);
 546     default:
 547         return c;
 548     }
 549 }
 550
 551 typedef enum TCGTempVal {
 552     TEMP_VAL_DEAD,
 553     TEMP_VAL_REG,
 554     TEMP_VAL_MEM,
 555     TEMP_VAL_CONST,
 556 } TCGTempVal;
 557
 558 typedef struct TCGTemp {
 559     TCGReg reg:8;
 560     TCGTempVal val_type:8;
 561     TCGType base_type:8;
 562     TCGType type:8;
 563     unsigned int fixed_reg:1;
 564     unsigned int indirect_reg:1;
 565     unsigned int indirect_base:1;
 566     unsigned int mem_coherent:1;
 567     unsigned int mem_allocated:1;
 568     /* If true, the temp is saved across both basic blocks and
 569        translation blocks.  */
 570     unsigned int temp_global:1;
 571     /* If true, the temp is saved across basic blocks but dead
 572        at the end of translation blocks.  If false, the temp is
 573        dead at the end of basic blocks.  */
 574     unsigned int temp_local:1;
 575     unsigned int temp_allocated:1;
 576
 577     tcg_target_long val;
 578     struct TCGTemp *mem_base;
 579     intptr_t mem_offset;
 580     const char *name;
 581
 582     /* Pass-specific information that can be stored for a temporary.
 583        One word worth of integer data, and one pointer to data
 584        allocated separately.  */
 585     uintptr_t state;
 586     void *state_ptr;
 587 } TCGTemp;
 588
 589 typedef struct TCGContext TCGContext;
 590
 591 typedef struct TCGTempSet {
 592     unsigned long l[BITS_TO_LONGS(TCG_MAX_TEMPS)];
 593 } TCGTempSet;
 594
 595 /* While we limit helpers to 6 arguments, for 32-bit hosts, with padding,
 596    this imples a max of 6*2 (64-bit in) + 2 (64-bit out) = 14 operands.
 597    There are never more than 2 outputs, which means that we can store all
 598    dead + sync data within 16 bits.  */
 599 #define DEAD_ARG  4
 600 #define SYNC_ARG  1
 601 typedef uint16_t TCGLifeData;
 602
 603 /* The layout here is designed to avoid a bitfield crossing of
 604    a 32-bit boundary, which would cause GCC to add extra padding.  */
 605 typedef struct TCGOp {
 606     TCGOpcode opc   : 8;        /*  8 */
 607
 608     /* Parameters for this opcode.  See below.  */
 609     unsigned param1 : 4;        /* 12 */
 610     unsigned param2 : 4;        /* 16 */
 611
 612     /* Lifetime data of the operands.  */
 613     unsigned life   : 16;       /* 32 */
 614
 615     /* Next and previous opcodes.  */
 616     QTAILQ_ENTRY(TCGOp) link;
 617
 618     /* Arguments for the opcode.  */
 619     TCGArg args[MAX_OPC_PARAM];
 620 } TCGOp;
 621
 622 #define TCGOP_CALLI(X)    (X)->param1
 623 #define TCGOP_CALLO(X)    (X)->param2
 624
 625 #define TCGOP_VECL(X)     (X)->param1
 626 #define TCGOP_VECE(X)     (X)->param2
 627
 628 /* Make sure operands fit in the bitfields above.  */
 629 QEMU_BUILD_BUG_ON(NB_OPS > (1 << 8));
 630
 631 typedef struct TCGProfile {
 632     int64_t tb_count1;
 633     int64_t tb_count;
 634     int64_t op_count; /* total insn count */
 635     int op_count_max; /* max insn per TB */
 636     int64_t temp_count;
 637     int temp_count_max;
 638     int64_t del_op_count;
 639     int64_t code_in_len;
 640     int64_t code_out_len;
 641     int64_t search_out_len;
 642     int64_t interm_time;
 643     int64_t code_time;
 644     int64_t la_time;
 645     int64_t opt_time;
 646     int64_t restore_count;
 647     int64_t restore_time;
 648     int64_t table_op_count[NB_OPS];
 649 } TCGProfile;
 650
 651 struct TCGContext {
 652     uint8_t *pool_cur, *pool_end;
 653     TCGPool *pool_first, *pool_current, *pool_first_large;
 654     int nb_labels;
 655     int nb_globals;
 656     int nb_temps;
 657     int nb_indirects;
 658     int nb_ops;
 659
 660     /* goto_tb support */
 661     tcg_insn_unit *code_buf;
 662     uint16_t *tb_jmp_reset_offset; /* tb->jmp_reset_offset */
 663     uintptr_t *tb_jmp_insn_offset; /* tb->jmp_target_arg if direct_jump */
 664     uintptr_t *tb_jmp_target_addr; /* tb->jmp_target_arg if !direct_jump */
 665
 666     TCGRegSet reserved_regs;
 667     uint32_t tb_cflags; /* cflags of the current TB */
 668     intptr_t current_frame_offset;
 669     intptr_t frame_start;
 670     intptr_t frame_end;
 671     TCGTemp *frame_temp;
 672
 673     tcg_insn_unit *code_ptr;
 674
 675 #ifdef CONFIG_PROFILER
 676     TCGProfile prof;
 677 #endif
 678
 679 #ifdef CONFIG_DEBUG_TCG
 680     int temps_in_use;
 681     int goto_tb_issue_mask;
 682 #endif
 683
 684     /* Code generation.  Note that we specifically do not use tcg_insn_unit
 685        here, because there's too much arithmetic throughout that relies
 686        on addition and subtraction working on bytes.  Rely on the GCC
 687        extension that allows arithmetic on void*.  */
 688     void *code_gen_prologue;
 689     void *code_gen_epilogue;
 690     void *code_gen_buffer;
 691     size_t code_gen_buffer_size;
 692     void *code_gen_ptr;
 693     void *data_gen_ptr;
 694
 695     /* Threshold to flush the translated code buffer.  */
 696     void *code_gen_highwater;
 697
 698     size_t tb_phys_invalidate_count;
 699
 700     /* Track which vCPU triggers events */
 701     CPUState *cpu;                      /* *_trans */
 702
 703     /* These structures are private to tcg-target.inc.c.  */
 704 #ifdef TCG_TARGET_NEED_LDST_LABELS
 705     QSIMPLEQ_HEAD(ldst_labels, TCGLabelQemuLdst) ldst_labels;
 706 #endif
 707 #ifdef TCG_TARGET_NEED_POOL_LABELS
 708     struct TCGLabelPoolData *pool_labels;
 709 #endif
 710
 711     TCGLabel *exitreq_label;
 712
 713     TCGTempSet free_temps[TCG_TYPE_COUNT * 2];
 714     TCGTemp temps[TCG_MAX_TEMPS]; /* globals first, temps after */
 715
 716     QTAILQ_HEAD(TCGOpHead, TCGOp) ops, free_ops;
 717
 718     /* Tells which temporary holds a given register.
 719        It does not take into account fixed registers */
 720     TCGTemp *reg_to_temp[TCG_TARGET_NB_REGS];
 721
 722     uint16_t gen_insn_end_off[TCG_MAX_INSNS];
 723     target_ulong gen_insn_data[TCG_MAX_INSNS][TARGET_INSN_START_WORDS];
 724 };
 725
 726 extern TCGContext tcg_init_ctx;
 727 extern __thread TCGContext *tcg_ctx;
 728 extern TCGv_env cpu_env;
 729
 730 static inline size_t temp_idx(TCGTemp *ts)
 731 {
 732     ptrdiff_t n = ts - tcg_ctx->temps;
 733     tcg_debug_assert(n >= 0 && n < tcg_ctx->nb_temps);
 734     return n;
 735 }
 736
 737 static inline TCGArg temp_arg(TCGTemp *ts)
 738 {
 739     return (uintptr_t)ts;
 740 }
 741
 742 static inline TCGTemp *arg_temp(TCGArg a)
 743 {
 744     return (TCGTemp *)(uintptr_t)a;
 745 }
 746
 747 /* Using the offset of a temporary, relative to TCGContext, rather than
 748    its index means that we don't use 0.  That leaves offset 0 free for
 749    a NULL representation without having to leave index 0 unused.  */
 750 static inline TCGTemp *tcgv_i32_temp(TCGv_i32 v)
 751 {
 752     uintptr_t o = (uintptr_t)v;
 753     TCGTemp *t = (void *)tcg_ctx + o;
 754     tcg_debug_assert(offsetof(TCGContext, temps[temp_idx(t)]) == o);
 755     return t;
 756 }
 757
 758 static inline TCGTemp *tcgv_i64_temp(TCGv_i64 v)
 759 {
 760     return tcgv_i32_temp((TCGv_i32)v);
 761 }
 762
 763 static inline TCGTemp *tcgv_ptr_temp(TCGv_ptr v)
 764 {
 765     return tcgv_i32_temp((TCGv_i32)v);
 766 }
 767
 768 static inline TCGTemp *tcgv_vec_temp(TCGv_vec v)
 769 {
 770     return tcgv_i32_temp((TCGv_i32)v);
 771 }
 772
 773 static inline TCGArg tcgv_i32_arg(TCGv_i32 v)
 774 {
 775     return temp_arg(tcgv_i32_temp(v));
 776 }
 777
 778 static inline TCGArg tcgv_i64_arg(TCGv_i64 v)
 779 {
 780     return temp_arg(tcgv_i64_temp(v));
 781 }
 782
 783 static inline TCGArg tcgv_ptr_arg(TCGv_ptr v)
 784 {
 785     return temp_arg(tcgv_ptr_temp(v));
 786 }
 787
 788 static inline TCGArg tcgv_vec_arg(TCGv_vec v)
 789 {
 790     return temp_arg(tcgv_vec_temp(v));
 791 }
 792
 793 static inline TCGv_i32 temp_tcgv_i32(TCGTemp *t)
 794 {
 795     (void)temp_idx(t); /* trigger embedded assert */
 796     return (TCGv_i32)((void *)t - (void *)tcg_ctx);
 797 }
 798
 799 static inline TCGv_i64 temp_tcgv_i64(TCGTemp *t)
 800 {
 801     return (TCGv_i64)temp_tcgv_i32(t);
 802 }
 803
 804 static inline TCGv_ptr temp_tcgv_ptr(TCGTemp *t)
 805 {
 806     return (TCGv_ptr)temp_tcgv_i32(t);
 807 }
 808
 809 static inline TCGv_vec temp_tcgv_vec(TCGTemp *t)
 810 {
 811     return (TCGv_vec)temp_tcgv_i32(t);
 812 }
 813
 814 #if TCG_TARGET_REG_BITS == 32
 815 static inline TCGv_i32 TCGV_LOW(TCGv_i64 t)
 816 {
 817     return temp_tcgv_i32(tcgv_i64_temp(t));
 818 }
 819
 820 static inline TCGv_i32 TCGV_HIGH(TCGv_i64 t)
 821 {
 822     return temp_tcgv_i32(tcgv_i64_temp(t) + 1);
 823 }
 824 #endif
 825
 826 static inline void tcg_set_insn_param(TCGOp *op, int arg, TCGArg v)
 827 {
 828     op->args[arg] = v;
 829 }
 830
 831 static inline void tcg_set_insn_start_param(TCGOp *op, int arg, target_ulong v)
 832 {
 833 #if TARGET_LONG_BITS <= TCG_TARGET_REG_BITS
 834     tcg_set_insn_param(op, arg, v);
 835 #else
 836     tcg_set_insn_param(op, arg * 2, v);
 837     tcg_set_insn_param(op, arg * 2 + 1, v >> 32);
 838 #endif
 839 }
 840
 841 /* The last op that was emitted.  */
 842 static inline TCGOp *tcg_last_op(void)
 843 {
 844     return QTAILQ_LAST(&tcg_ctx->ops, TCGOpHead);
 845 }
 846
 847 /* Test for whether to terminate the TB for using too many opcodes.  */
 848 static inline bool tcg_op_buf_full(void)
 849 {
 850     /* This is not a hard limit, it merely stops translation when
 851      * we have produced "enough" opcodes.  We want to limit TB size
 852      * such that a RISC host can reasonably use a 16-bit signed
 853      * branch within the TB.  We also need to be mindful of the
 854      * 16-bit unsigned offsets, TranslationBlock.jmp_reset_offset[]
 855      * and TCGContext.gen_insn_end_off[].
 856      */
 857     return tcg_ctx->nb_ops >= 4000;
 858 }
 859
 860 /* pool based memory allocation */
 861
 862 /* user-mode: mmap_lock must be held for tcg_malloc_internal. */
 863 void *tcg_malloc_internal(TCGContext *s, int size);
 864 void tcg_pool_reset(TCGContext *s);
 865 TranslationBlock *tcg_tb_alloc(TCGContext *s);
 866
 867 void tcg_region_init(void);
 868 void tcg_region_reset_all(void);
 869
 870 size_t tcg_code_size(void);
 871 size_t tcg_code_capacity(void);
 872
 873 void tcg_tb_insert(TranslationBlock *tb);
 874 void tcg_tb_remove(TranslationBlock *tb);
 875 size_t tcg_tb_phys_invalidate_count(void);
 876 TranslationBlock *tcg_tb_lookup(uintptr_t tc_ptr);
 877 void tcg_tb_foreach(GTraverseFunc func, gpointer user_data);
 878 size_t tcg_nb_tbs(void);
 879
 880 /* user-mode: Called with mmap_lock held.  */
 881 static inline void *tcg_malloc(int size)
 882 {
 883     TCGContext *s = tcg_ctx;
 884     uint8_t *ptr, *ptr_end;
 885
 886     /* ??? This is a weak placeholder for minimum malloc alignment.  */
 887     size = QEMU_ALIGN_UP(size, 8);
 888
 889     ptr = s->pool_cur;
 890     ptr_end = ptr + size;
 891     if (unlikely(ptr_end > s->pool_end)) {
 892         return tcg_malloc_internal(tcg_ctx, size);
 893     } else {
 894         s->pool_cur = ptr_end;
 895         return ptr;
 896     }
 897 }
 898
 899 void tcg_context_init(TCGContext *s);
 900 void tcg_register_thread(void);
 901 void tcg_prologue_init(TCGContext *s);
 902 void tcg_func_start(TCGContext *s);
 903
 904 int tcg_gen_code(TCGContext *s, TranslationBlock *tb);
 905
 906 void tcg_set_frame(TCGContext *s, TCGReg reg, intptr_t start, intptr_t size);
 907
 908 TCGTemp *tcg_global_mem_new_internal(TCGType, TCGv_ptr,
 909                                      intptr_t, const char *);
 910 TCGTemp *tcg_temp_new_internal(TCGType, bool);
 911 void tcg_temp_free_internal(TCGTemp *);
 912 TCGv_vec tcg_temp_new_vec(TCGType type);
 913 TCGv_vec tcg_temp_new_vec_matching(TCGv_vec match);
 914
 915 static inline void tcg_temp_free_i32(TCGv_i32 arg)
 916 {
 917     tcg_temp_free_internal(tcgv_i32_temp(arg));
 918 }
 919
 920 static inline void tcg_temp_free_i64(TCGv_i64 arg)
 921 {
 922     tcg_temp_free_internal(tcgv_i64_temp(arg));
 923 }
 924
 925 static inline void tcg_temp_free_ptr(TCGv_ptr arg)
 926 {
 927     tcg_temp_free_internal(tcgv_ptr_temp(arg));
 928 }
 929
 930 static inline void tcg_temp_free_vec(TCGv_vec arg)
 931 {
 932     tcg_temp_free_internal(tcgv_vec_temp(arg));
 933 }
 934
 935 static inline TCGv_i32 tcg_global_mem_new_i32(TCGv_ptr reg, intptr_t offset,
 936                                               const char *name)
 937 {
 938     TCGTemp *t = tcg_global_mem_new_internal(TCG_TYPE_I32, reg, offset, name);
 939     return temp_tcgv_i32(t);
 940 }
 941
 942 static inline TCGv_i32 tcg_temp_new_i32(void)
 943 {
 944     TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I32, false);
 945     return temp_tcgv_i32(t);
 946 }
 947
 948 static inline TCGv_i32 tcg_temp_local_new_i32(void)
 949 {
 950     TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I32, true);
 951     return temp_tcgv_i32(t);
 952 }
 953
 954 static inline TCGv_i64 tcg_global_mem_new_i64(TCGv_ptr reg, intptr_t offset,
 955                                               const char *name)
 956 {
 957     TCGTemp *t = tcg_global_mem_new_internal(TCG_TYPE_I64, reg, offset, name);
 958     return temp_tcgv_i64(t);
 959 }
 960
 961 static inline TCGv_i64 tcg_temp_new_i64(void)
 962 {
 963     TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I64, false);
 964     return temp_tcgv_i64(t);
 965 }
 966
 967 static inline TCGv_i64 tcg_temp_local_new_i64(void)
 968 {
 969     TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I64, true);
 970     return temp_tcgv_i64(t);
 971 }
 972
 973 static inline TCGv_ptr tcg_global_mem_new_ptr(TCGv_ptr reg, intptr_t offset,
 974                                               const char *name)
 975 {
 976     TCGTemp *t = tcg_global_mem_new_internal(TCG_TYPE_PTR, reg, offset, name);
 977     return temp_tcgv_ptr(t);
 978 }
 979
 980 static inline TCGv_ptr tcg_temp_new_ptr(void)
 981 {
 982     TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_PTR, false);
 983     return temp_tcgv_ptr(t);
 984 }
 985
 986 static inline TCGv_ptr tcg_temp_local_new_ptr(void)
 987 {
 988     TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_PTR, true);
 989     return temp_tcgv_ptr(t);
 990 }
 991
 992 #if defined(CONFIG_DEBUG_TCG)
 993 /* If you call tcg_clear_temp_count() at the start of a section of
 994  * code which is not supposed to leak any TCG temporaries, then
 995  * calling tcg_check_temp_count() at the end of the section will
 996  * return 1 if the section did in fact leak a temporary.
 997  */
 998 void tcg_clear_temp_count(void);
 999 int tcg_check_temp_count(void);
1000 #else
1001 #define tcg_clear_temp_count() do { } while (0)
1002 #define tcg_check_temp_count() 0
1003 #endif
1004
1005 void tcg_dump_info(FILE *f, fprintf_function cpu_fprintf);
1006 void tcg_dump_op_count(FILE *f, fprintf_function cpu_fprintf);
1007
1008 #define TCG_CT_ALIAS  0x80
1009 #define TCG_CT_IALIAS 0x40
1010 #define TCG_CT_NEWREG 0x20 /* output requires a new register */
1011 #define TCG_CT_REG    0x01
1012 #define TCG_CT_CONST  0x02 /* any constant of register size */
1013
1014 typedef struct TCGArgConstraint {
1015     uint16_t ct;
1016     uint8_t alias_index;
1017     union {
1018         TCGRegSet regs;
1019     } u;
1020 } TCGArgConstraint;
1021
1022 #define TCG_MAX_OP_ARGS 16
1023
1024 /* Bits for TCGOpDef->flags, 8 bits available.  */
1025 enum {
1026     /* Instruction defines the end of a basic block.  */
1027     TCG_OPF_BB_END       = 0x01,
1028     /* Instruction clobbers call registers and potentially update globals.  */
1029     TCG_OPF_CALL_CLOBBER = 0x02,
1030     /* Instruction has side effects: it cannot be removed if its outputs
1031        are not used, and might trigger exceptions.  */
1032     TCG_OPF_SIDE_EFFECTS = 0x04,
1033     /* Instruction operands are 64-bits (otherwise 32-bits).  */
1034     TCG_OPF_64BIT        = 0x08,
1035     /* Instruction is optional and not implemented by the host, or insn
1036        is generic and should not be implemened by the host.  */
1037     TCG_OPF_NOT_PRESENT  = 0x10,
1038     /* Instruction operands are vectors.  */
1039     TCG_OPF_VECTOR       = 0x20,
1040 };
1041
1042 typedef struct TCGOpDef {
1043     const char *name;
1044     uint8_t nb_oargs, nb_iargs, nb_cargs, nb_args;
1045     uint8_t flags;
1046     TCGArgConstraint *args_ct;
1047     int *sorted_args;
1048 #if defined(CONFIG_DEBUG_TCG)
1049     int used;
1050 #endif
1051 } TCGOpDef;
1052
1053 extern TCGOpDef tcg_op_defs[];
1054 extern const size_t tcg_op_defs_max;
1055
1056 typedef struct TCGTargetOpDef {
1057     TCGOpcode op;
1058     const char *args_ct_str[TCG_MAX_OP_ARGS];
1059 } TCGTargetOpDef;
1060
1061 #define tcg_abort() \
1062 do {\
1063     fprintf(stderr, "%s:%d: tcg fatal error\n", __FILE__, __LINE__);\
1064     abort();\
1065 } while (0)
1066
1067 bool tcg_op_supported(TCGOpcode op);
1068
1069 void tcg_gen_callN(void *func, TCGTemp *ret, int nargs, TCGTemp **args);
1070
1071 TCGOp *tcg_emit_op(TCGOpcode opc);
1072 void tcg_op_remove(TCGContext *s, TCGOp *op);
1073 TCGOp *tcg_op_insert_before(TCGContext *s, TCGOp *op, TCGOpcode opc, int narg);
1074 TCGOp *tcg_op_insert_after(TCGContext *s, TCGOp *op, TCGOpcode opc, int narg);
1075
1076 void tcg_optimize(TCGContext *s);
1077
1078 /* only used for debugging purposes */
1079 void tcg_dump_ops(TCGContext *s);
1080
1081 TCGv_i32 tcg_const_i32(int32_t val);
1082 TCGv_i64 tcg_const_i64(int64_t val);
1083 TCGv_i32 tcg_const_local_i32(int32_t val);
1084 TCGv_i64 tcg_const_local_i64(int64_t val);
1085 TCGv_vec tcg_const_zeros_vec(TCGType);
1086 TCGv_vec tcg_const_ones_vec(TCGType);
1087 TCGv_vec tcg_const_zeros_vec_matching(TCGv_vec);
1088 TCGv_vec tcg_const_ones_vec_matching(TCGv_vec);
1089
1090 #if UINTPTR_MAX == UINT32_MAX
1091 # define tcg_const_ptr(x)        ((TCGv_ptr)tcg_const_i32((intptr_t)(x)))
1092 # define tcg_const_local_ptr(x)  ((TCGv_ptr)tcg_const_local_i32((intptr_t)(x)))
1093 #else
1094 # define tcg_const_ptr(x)        ((TCGv_ptr)tcg_const_i64((intptr_t)(x)))
1095 # define tcg_const_local_ptr(x)  ((TCGv_ptr)tcg_const_local_i64((intptr_t)(x)))
1096 #endif
1097
1098 TCGLabel *gen_new_label(void);
1099
1100 /**
1101  * label_arg
1102  * @l: label
1103  *
1104  * Encode a label for storage in the TCG opcode stream.
1105  */
1106
1107 static inline TCGArg label_arg(TCGLabel *l)
1108 {
1109     return (uintptr_t)l;
1110 }
1111
1112 /**
1113  * arg_label
1114  * @i: value
1115  *
1116  * The opposite of label_arg.  Retrieve a label from the
1117  * encoding of the TCG opcode stream.
1118  */
1119
1120 static inline TCGLabel *arg_label(TCGArg i)
1121 {
1122     return (TCGLabel *)(uintptr_t)i;
1123 }
1124
1125 /**
1126  * tcg_ptr_byte_diff
1127  * @a, @b: addresses to be differenced
1128  *
1129  * There are many places within the TCG backends where we need a byte
1130  * difference between two pointers.  While this can be accomplished
1131  * with local casting, it's easy to get wrong -- especially if one is
1132  * concerned with the signedness of the result.
1133  *
1134  * This version relies on GCC's void pointer arithmetic to get the
1135  * correct result.
1136  */
1137
1138 static inline ptrdiff_t tcg_ptr_byte_diff(void *a, void *b)
1139 {
1140     return a - b;
1141 }
1142
1143 /**
1144  * tcg_pcrel_diff
1145  * @s: the tcg context
1146  * @target: address of the target
1147  *
1148  * Produce a pc-relative difference, from the current code_ptr
1149  * to the destination address.
1150  */
1151
1152 static inline ptrdiff_t tcg_pcrel_diff(TCGContext *s, void *target)
1153 {
1154     return tcg_ptr_byte_diff(target, s->code_ptr);
1155 }
1156
1157 /**
1158  * tcg_current_code_size
1159  * @s: the tcg context
1160  *
1161  * Compute the current code size within the translation block.
1162  * This is used to fill in qemu's data structures for goto_tb.
1163  */
1164
1165 static inline size_t tcg_current_code_size(TCGContext *s)
1166 {
1167     return tcg_ptr_byte_diff(s->code_ptr, s->code_buf);
1168 }
1169
1170 /* Combine the TCGMemOp and mmu_idx parameters into a single value.  */
1171 typedef uint32_t TCGMemOpIdx;
1172
1173 /**
1174  * make_memop_idx
1175  * @op: memory operation
1176  * @idx: mmu index
1177  *
1178  * Encode these values into a single parameter.
1179  */
1180 static inline TCGMemOpIdx make_memop_idx(TCGMemOp op, unsigned idx)
1181 {
1182     tcg_debug_assert(idx <= 15);
1183     return (op << 4) | idx;
1184 }
1185
1186 /**
1187  * get_memop
1188  * @oi: combined op/idx parameter
1189  *
1190  * Extract the memory operation from the combined value.
1191  */
1192 static inline TCGMemOp get_memop(TCGMemOpIdx oi)
1193 {
1194     return oi >> 4;
1195 }
1196
1197 /**
1198  * get_mmuidx
1199  * @oi: combined op/idx parameter
1200  *
1201  * Extract the mmu index from the combined value.
1202  */
1203 static inline unsigned get_mmuidx(TCGMemOpIdx oi)
1204 {
1205     return oi & 15;
1206 }
1207
1208 /**
1209  * tcg_qemu_tb_exec:
1210  * @env: pointer to CPUArchState for the CPU
1211  * @tb_ptr: address of generated code for the TB to execute
1212  *
1213  * Start executing code from a given translation block.
1214  * Where translation blocks have been linked, execution
1215  * may proceed from the given TB into successive ones.
1216  * Control eventually returns only when some action is needed
1217  * from the top-level loop: either control must pass to a TB
1218  * which has not yet been directly linked, or an asynchronous
1219  * event such as an interrupt needs handling.
1220  *
1221  * Return: The return value is the value passed to the corresponding
1222  * tcg_gen_exit_tb() at translation time of the last TB attempted to execute.
1223  * The value is either zero or a 4-byte aligned pointer to that TB combined
1224  * with additional information in its two least significant bits. The
1225  * additional information is encoded as follows:
1226  *  0, 1: the link between this TB and the next is via the specified
1227  *        TB index (0 or 1). That is, we left the TB via (the equivalent
1228  *        of) "goto_tb <index>". The main loop uses this to determine
1229  *        how to link the TB just executed to the next.
1230  *  2:    we are using instruction counting code generation, and we
1231  *        did not start executing this TB because the instruction counter
1232  *        would hit zero midway through it. In this case the pointer
1233  *        returned is the TB we were about to execute, and the caller must
1234  *        arrange to execute the remaining count of instructions.
1235  *  3:    we stopped because the CPU's exit_request flag was set
1236  *        (usually meaning that there is an interrupt that needs to be
1237  *        handled). The pointer returned is the TB we were about to execute
1238  *        when we noticed the pending exit request.
1239  *
1240  * If the bottom two bits indicate an exit-via-index then the CPU
1241  * state is correctly synchronised and ready for execution of the next
1242  * TB (and in particular the guest PC is the address to execute next).
1243  * Otherwise, we gave up on execution of this TB before it started, and
1244  * the caller must fix up the CPU state by calling the CPU's
1245  * synchronize_from_tb() method with the TB pointer we return (falling
1246  * back to calling the CPU's set_pc method with tb->pb if no
1247  * synchronize_from_tb() method exists).
1248  *
1249  * Note that TCG targets may use a different definition of tcg_qemu_tb_exec
1250  * to this default (which just calls the prologue.code emitted by
1251  * tcg_target_qemu_prologue()).
1252  */
1253 #define TB_EXIT_MASK      3
1254 #define TB_EXIT_IDX0      0
1255 #define TB_EXIT_IDX1      1
1256 #define TB_EXIT_IDXMAX    1
1257 #define TB_EXIT_REQUESTED 3
1258
1259 #ifdef HAVE_TCG_QEMU_TB_EXEC
1260 uintptr_t tcg_qemu_tb_exec(CPUArchState *env, uint8_t *tb_ptr);
1261 #else
1262 # define tcg_qemu_tb_exec(env, tb_ptr) \
1263     ((uintptr_t (*)(void *, void *))tcg_ctx->code_gen_prologue)(env, tb_ptr)
1264 #endif
1265
1266 void tcg_register_jit(void *buf, size_t buf_size);
1267
1268 #if TCG_TARGET_MAYBE_vec
1269 /* Return zero if the tuple (opc, type, vece) is unsupportable;
1270    return > 0 if it is directly supportable;
1271    return < 0 if we must call tcg_expand_vec_op.  */
1272 int tcg_can_emit_vec_op(TCGOpcode, TCGType, unsigned);
1273 #else
1274 static inline int tcg_can_emit_vec_op(TCGOpcode o, TCGType t, unsigned ve)
1275 {
1276     return 0;
1277 }
1278 #endif
1279
1280 /* Expand the tuple (opc, type, vece) on the given arguments.  */
1281 void tcg_expand_vec_op(TCGOpcode, TCGType, unsigned, TCGArg, ...);
1282
1283 /* Replicate a constant C accoring to the log2 of the element size.  */
1284 uint64_t dup_const(unsigned vece, uint64_t c);
1285
1286 #define dup_const(VECE, C)                                         \
1287     (__builtin_constant_p(VECE)                                    \
1288      ? (  (VECE) == MO_8  ? 0x0101010101010101ull * (uint8_t)(C)   \
1289         : (VECE) == MO_16 ? 0x0001000100010001ull * (uint16_t)(C)  \
1290         : (VECE) == MO_32 ? 0x0000000100000001ull * (uint32_t)(C)  \
1291         : dup_const(VECE, C))                                      \
1292      : dup_const(VECE, C))
1293
1294
1295 /*
1296  * Memory helpers that will be used by TCG generated code.
1297  */
1298 #ifdef CONFIG_SOFTMMU
1299 /* Value zero-extended to tcg register size.  */
1300 tcg_target_ulong helper_ret_ldub_mmu(CPUArchState *env, target_ulong addr,
1301                                      TCGMemOpIdx oi, uintptr_t retaddr);
1302 tcg_target_ulong helper_le_lduw_mmu(CPUArchState *env, target_ulong addr,
1303                                     TCGMemOpIdx oi, uintptr_t retaddr);
1304 tcg_target_ulong helper_le_ldul_mmu(CPUArchState *env, target_ulong addr,
1305                                     TCGMemOpIdx oi, uintptr_t retaddr);
1306 uint64_t helper_le_ldq_mmu(CPUArchState *env, target_ulong addr,
1307                            TCGMemOpIdx oi, uintptr_t retaddr);
1308 tcg_target_ulong helper_be_lduw_mmu(CPUArchState *env, target_ulong addr,
1309                                     TCGMemOpIdx oi, uintptr_t retaddr);
1310 tcg_target_ulong helper_be_ldul_mmu(CPUArchState *env, target_ulong addr,
1311                                     TCGMemOpIdx oi, uintptr_t retaddr);
1312 uint64_t helper_be_ldq_mmu(CPUArchState *env, target_ulong addr,
1313                            TCGMemOpIdx oi, uintptr_t retaddr);
1314
1315 /* Value sign-extended to tcg register size.  */
1316 tcg_target_ulong helper_ret_ldsb_mmu(CPUArchState *env, target_ulong addr,
1317                                      TCGMemOpIdx oi, uintptr_t retaddr);
1318 tcg_target_ulong helper_le_ldsw_mmu(CPUArchState *env, target_ulong addr,
1319                                     TCGMemOpIdx oi, uintptr_t retaddr);
1320 tcg_target_ulong helper_le_ldsl_mmu(CPUArchState *env, target_ulong addr,
1321                                     TCGMemOpIdx oi, uintptr_t retaddr);
1322 tcg_target_ulong helper_be_ldsw_mmu(CPUArchState *env, target_ulong addr,
1323                                     TCGMemOpIdx oi, uintptr_t retaddr);
1324 tcg_target_ulong helper_be_ldsl_mmu(CPUArchState *env, target_ulong addr,
1325                                     TCGMemOpIdx oi, uintptr_t retaddr);
1326
1327 void helper_ret_stb_mmu(CPUArchState *env, target_ulong addr, uint8_t val,
1328                         TCGMemOpIdx oi, uintptr_t retaddr);
1329 void helper_le_stw_mmu(CPUArchState *env, target_ulong addr, uint16_t val,
1330                        TCGMemOpIdx oi, uintptr_t retaddr);
1331 void helper_le_stl_mmu(CPUArchState *env, target_ulong addr, uint32_t val,
1332                        TCGMemOpIdx oi, uintptr_t retaddr);
1333 void helper_le_stq_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
1334                        TCGMemOpIdx oi, uintptr_t retaddr);
1335 void helper_be_stw_mmu(CPUArchState *env, target_ulong addr, uint16_t val,
1336                        TCGMemOpIdx oi, uintptr_t retaddr);
1337 void helper_be_stl_mmu(CPUArchState *env, target_ulong addr, uint32_t val,
1338                        TCGMemOpIdx oi, uintptr_t retaddr);
1339 void helper_be_stq_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
1340                        TCGMemOpIdx oi, uintptr_t retaddr);
1341
1342 uint8_t helper_ret_ldb_cmmu(CPUArchState *env, target_ulong addr,
1343                             TCGMemOpIdx oi, uintptr_t retaddr);
1344 uint16_t helper_le_ldw_cmmu(CPUArchState *env, target_ulong addr,
1345                             TCGMemOpIdx oi, uintptr_t retaddr);
1346 uint32_t helper_le_ldl_cmmu(CPUArchState *env, target_ulong addr,
1347                             TCGMemOpIdx oi, uintptr_t retaddr);
1348 uint64_t helper_le_ldq_cmmu(CPUArchState *env, target_ulong addr,
1349                             TCGMemOpIdx oi, uintptr_t retaddr);
1350 uint16_t helper_be_ldw_cmmu(CPUArchState *env, target_ulong addr,
1351                             TCGMemOpIdx oi, uintptr_t retaddr);
1352 uint32_t helper_be_ldl_cmmu(CPUArchState *env, target_ulong addr,
1353                             TCGMemOpIdx oi, uintptr_t retaddr);
1354 uint64_t helper_be_ldq_cmmu(CPUArchState *env, target_ulong addr,
1355                             TCGMemOpIdx oi, uintptr_t retaddr);
1356
1357 /* Temporary aliases until backends are converted.  */
1358 #ifdef TARGET_WORDS_BIGENDIAN
1359 # define helper_ret_ldsw_mmu  helper_be_ldsw_mmu
1360 # define helper_ret_lduw_mmu  helper_be_lduw_mmu
1361 # define helper_ret_ldsl_mmu  helper_be_ldsl_mmu
1362 # define helper_ret_ldul_mmu  helper_be_ldul_mmu
1363 # define helper_ret_ldl_mmu   helper_be_ldul_mmu
1364 # define helper_ret_ldq_mmu   helper_be_ldq_mmu
1365 # define helper_ret_stw_mmu   helper_be_stw_mmu
1366 # define helper_ret_stl_mmu   helper_be_stl_mmu
1367 # define helper_ret_stq_mmu   helper_be_stq_mmu
1368 # define helper_ret_ldw_cmmu  helper_be_ldw_cmmu
1369 # define helper_ret_ldl_cmmu  helper_be_ldl_cmmu
1370 # define helper_ret_ldq_cmmu  helper_be_ldq_cmmu
1371 #else
1372 # define helper_ret_ldsw_mmu  helper_le_ldsw_mmu
1373 # define helper_ret_lduw_mmu  helper_le_lduw_mmu
1374 # define helper_ret_ldsl_mmu  helper_le_ldsl_mmu
1375 # define helper_ret_ldul_mmu  helper_le_ldul_mmu
1376 # define helper_ret_ldl_mmu   helper_le_ldul_mmu
1377 # define helper_ret_ldq_mmu   helper_le_ldq_mmu
1378 # define helper_ret_stw_mmu   helper_le_stw_mmu
1379 # define helper_ret_stl_mmu   helper_le_stl_mmu
1380 # define helper_ret_stq_mmu   helper_le_stq_mmu
1381 # define helper_ret_ldw_cmmu  helper_le_ldw_cmmu
1382 # define helper_ret_ldl_cmmu  helper_le_ldl_cmmu
1383 # define helper_ret_ldq_cmmu  helper_le_ldq_cmmu
1384 #endif
1385
1386 uint32_t helper_atomic_cmpxchgb_mmu(CPUArchState *env, target_ulong addr,
1387                                     uint32_t cmpv, uint32_t newv,
1388                                     TCGMemOpIdx oi, uintptr_t retaddr);
1389 uint32_t helper_atomic_cmpxchgw_le_mmu(CPUArchState *env, target_ulong addr,
1390                                        uint32_t cmpv, uint32_t newv,
1391                                        TCGMemOpIdx oi, uintptr_t retaddr);
1392 uint32_t helper_atomic_cmpxchgl_le_mmu(CPUArchState *env, target_ulong addr,
1393                                        uint32_t cmpv, uint32_t newv,
1394                                        TCGMemOpIdx oi, uintptr_t retaddr);
1395 uint64_t helper_atomic_cmpxchgq_le_mmu(CPUArchState *env, target_ulong addr,
1396                                        uint64_t cmpv, uint64_t newv,
1397                                        TCGMemOpIdx oi, uintptr_t retaddr);
1398 uint32_t helper_atomic_cmpxchgw_be_mmu(CPUArchState *env, target_ulong addr,
1399                                        uint32_t cmpv, uint32_t newv,
1400                                        TCGMemOpIdx oi, uintptr_t retaddr);
1401 uint32_t helper_atomic_cmpxchgl_be_mmu(CPUArchState *env, target_ulong addr,
1402                                        uint32_t cmpv, uint32_t newv,
1403                                        TCGMemOpIdx oi, uintptr_t retaddr);
1404 uint64_t helper_atomic_cmpxchgq_be_mmu(CPUArchState *env, target_ulong addr,
1405                                        uint64_t cmpv, uint64_t newv,
1406                                        TCGMemOpIdx oi, uintptr_t retaddr);
1407
1408 #define GEN_ATOMIC_HELPER(NAME, TYPE, SUFFIX)         \
1409 TYPE helper_atomic_ ## NAME ## SUFFIX ## _mmu         \
1410     (CPUArchState *env, target_ulong addr, TYPE val,  \
1411      TCGMemOpIdx oi, uintptr_t retaddr);
1412
1413 #ifdef CONFIG_ATOMIC64
1414 #define GEN_ATOMIC_HELPER_ALL(NAME)          \
1415     GEN_ATOMIC_HELPER(NAME, uint32_t, b)     \
1416     GEN_ATOMIC_HELPER(NAME, uint32_t, w_le)  \
1417     GEN_ATOMIC_HELPER(NAME, uint32_t, w_be)  \
1418     GEN_ATOMIC_HELPER(NAME, uint32_t, l_le)  \
1419     GEN_ATOMIC_HELPER(NAME, uint32_t, l_be)  \
1420     GEN_ATOMIC_HELPER(NAME, uint64_t, q_le)  \
1421     GEN_ATOMIC_HELPER(NAME, uint64_t, q_be)
1422 #else
1423 #define GEN_ATOMIC_HELPER_ALL(NAME)          \
1424     GEN_ATOMIC_HELPER(NAME, uint32_t, b)     \
1425     GEN_ATOMIC_HELPER(NAME, uint32_t, w_le)  \
1426     GEN_ATOMIC_HELPER(NAME, uint32_t, w_be)  \
1427     GEN_ATOMIC_HELPER(NAME, uint32_t, l_le)  \
1428     GEN_ATOMIC_HELPER(NAME, uint32_t, l_be)
1429 #endif
1430
1431 GEN_ATOMIC_HELPER_ALL(fetch_add)
1432 GEN_ATOMIC_HELPER_ALL(fetch_sub)
1433 GEN_ATOMIC_HELPER_ALL(fetch_and)
1434 GEN_ATOMIC_HELPER_ALL(fetch_or)
1435 GEN_ATOMIC_HELPER_ALL(fetch_xor)
1436 GEN_ATOMIC_HELPER_ALL(fetch_smin)
1437 GEN_ATOMIC_HELPER_ALL(fetch_umin)
1438 GEN_ATOMIC_HELPER_ALL(fetch_smax)
1439 GEN_ATOMIC_HELPER_ALL(fetch_umax)
1440
1441 GEN_ATOMIC_HELPER_ALL(add_fetch)
1442 GEN_ATOMIC_HELPER_ALL(sub_fetch)
1443 GEN_ATOMIC_HELPER_ALL(and_fetch)
1444 GEN_ATOMIC_HELPER_ALL(or_fetch)
1445 GEN_ATOMIC_HELPER_ALL(xor_fetch)
1446 GEN_ATOMIC_HELPER_ALL(smin_fetch)
1447 GEN_ATOMIC_HELPER_ALL(umin_fetch)
1448 GEN_ATOMIC_HELPER_ALL(smax_fetch)
1449 GEN_ATOMIC_HELPER_ALL(umax_fetch)
1450
1451 GEN_ATOMIC_HELPER_ALL(xchg)
1452
1453 #undef GEN_ATOMIC_HELPER_ALL
1454 #undef GEN_ATOMIC_HELPER
1455 #endif /* CONFIG_SOFTMMU */
1456
1457 #ifdef CONFIG_ATOMIC128
1458 #include "qemu/int128.h"
1459
1460 /* These aren't really a "proper" helpers because TCG cannot manage Int128.
1461    However, use the same format as the others, for use by the backends. */
1462 Int128 helper_atomic_cmpxchgo_le_mmu(CPUArchState *env, target_ulong addr,
1463                                      Int128 cmpv, Int128 newv,
1464                                      TCGMemOpIdx oi, uintptr_t retaddr);
1465 Int128 helper_atomic_cmpxchgo_be_mmu(CPUArchState *env, target_ulong addr,
1466                                      Int128 cmpv, Int128 newv,
1467                                      TCGMemOpIdx oi, uintptr_t retaddr);
1468
1469 Int128 helper_atomic_ldo_le_mmu(CPUArchState *env, target_ulong addr,
1470                                 TCGMemOpIdx oi, uintptr_t retaddr);
1471 Int128 helper_atomic_ldo_be_mmu(CPUArchState *env, target_ulong addr,
1472                                 TCGMemOpIdx oi, uintptr_t retaddr);
1473 void helper_atomic_sto_le_mmu(CPUArchState *env, target_ulong addr, Int128 val,
1474                               TCGMemOpIdx oi, uintptr_t retaddr);
1475 void helper_atomic_sto_be_mmu(CPUArchState *env, target_ulong addr, Int128 val,
1476                               TCGMemOpIdx oi, uintptr_t retaddr);
1477
1478 #endif /* CONFIG_ATOMIC128 */
1479
1480 #endif /* TCG_H */