src/lttng-bytecode-interpreter.c

   1 /* SPDX-License-Identifier: MIT
   2  *
   3  * lttng-bytecode-interpreter.c
   4  *
   5  * LTTng modules bytecode interpreter.
   6  *
   7  * Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  */
   9
  10 #include <wrapper/uaccess.h>
  11 #include <wrapper/objtool.h>
  12 #include <wrapper/types.h>
  13 #include <linux/swab.h>
  14
  15 #include <lttng/lttng-bytecode.h>
  16 #include <lttng/string-utils.h>
  17
  18 /*
  19  * get_char should be called with page fault handler disabled if it is expected
  20  * to handle user-space read.
  21  */
  22 static
  23 char get_char(struct estack_entry *reg, size_t offset)
  24 {
  25         if (unlikely(offset >= reg->u.s.seq_len))
  26                 return '\0';
  27         if (reg->u.s.user) {
  28                 char c;
  29
  30                 /* Handle invalid access as end of string. */
  31                 if (unlikely(!lttng_access_ok(VERIFY_READ,
  32                                 reg->u.s.user_str + offset,
  33                                 sizeof(c))))
  34                         return '\0';
  35                 /* Handle fault (nonzero return value) as end of string. */
  36                 if (unlikely(__copy_from_user_inatomic(&c,
  37                                 reg->u.s.user_str + offset,
  38                                 sizeof(c))))
  39                         return '\0';
  40                 return c;
  41         } else {
  42                 return reg->u.s.str[offset];
  43         }
  44 }
  45
  46 /*
  47  * -1: wildcard found.
  48  * -2: unknown escape char.
  49  * 0: normal char.
  50  */
  51 static
  52 int parse_char(struct estack_entry *reg, char *c, size_t *offset)
  53 {
  54         switch (*c) {
  55         case '\\':
  56                 (*offset)++;
  57                 *c = get_char(reg, *offset);
  58                 switch (*c) {
  59                 case '\\':
  60                 case '*':
  61                         return 0;
  62                 default:
  63                         return -2;
  64                 }
  65         case '*':
  66                 return -1;
  67         default:
  68                 return 0;
  69         }
  70 }
  71
  72 static
  73 char get_char_at_cb(size_t at, void *data)
  74 {
  75         return get_char(data, at);
  76 }
  77
  78 static
  79 int stack_star_glob_match(struct estack *stack, int top, const char *cmp_type)
  80 {
  81         bool has_user = false;
  82         int result;
  83         struct estack_entry *pattern_reg;
  84         struct estack_entry *candidate_reg;
  85
  86         /* Disable the page fault handler when reading from userspace. */
  87         if (estack_bx(stack, top)->u.s.user
  88                         || estack_ax(stack, top)->u.s.user) {
  89                 has_user = true;
  90                 pagefault_disable();
  91         }
  92
  93         /* Find out which side is the pattern vs. the candidate. */
  94         if (estack_ax(stack, top)->u.s.literal_type == ESTACK_STRING_LITERAL_TYPE_STAR_GLOB) {
  95                 pattern_reg = estack_ax(stack, top);
  96                 candidate_reg = estack_bx(stack, top);
  97         } else {
  98                 pattern_reg = estack_bx(stack, top);
  99                 candidate_reg = estack_ax(stack, top);
 100         }
 101
 102         /* Perform the match operation. */
 103         result = !strutils_star_glob_match_char_cb(get_char_at_cb,
 104                 pattern_reg, get_char_at_cb, candidate_reg);
 105         if (has_user)
 106                 pagefault_enable();
 107
 108         return result;
 109 }
 110
 111 static
 112 int stack_strcmp(struct estack *stack, int top, const char *cmp_type)
 113 {
 114         size_t offset_bx = 0, offset_ax = 0;
 115         int diff, has_user = 0;
 116
 117         if (estack_bx(stack, top)->u.s.user
 118                         || estack_ax(stack, top)->u.s.user) {
 119                 has_user = 1;
 120                 pagefault_disable();
 121         }
 122
 123         for (;;) {
 124                 int ret;
 125                 int escaped_r0 = 0;
 126                 char char_bx, char_ax;
 127
 128                 char_bx = get_char(estack_bx(stack, top), offset_bx);
 129                 char_ax = get_char(estack_ax(stack, top), offset_ax);
 130
 131                 if (unlikely(char_bx == '\0')) {
 132                         if (char_ax == '\0') {
 133                                 diff = 0;
 134                                 break;
 135                         } else {
 136                                 if (estack_ax(stack, top)->u.s.literal_type ==
 137                                                 ESTACK_STRING_LITERAL_TYPE_PLAIN) {
 138                                         ret = parse_char(estack_ax(stack, top),
 139                                                 &char_ax, &offset_ax);
 140                                         if (ret == -1) {
 141                                                 diff = 0;
 142                                                 break;
 143                                         }
 144                                 }
 145                                 diff = -1;
 146                                 break;
 147                         }
 148                 }
 149                 if (unlikely(char_ax == '\0')) {
 150                         if (estack_bx(stack, top)->u.s.literal_type ==
 151                                         ESTACK_STRING_LITERAL_TYPE_PLAIN) {
 152                                 ret = parse_char(estack_bx(stack, top),
 153                                         &char_bx, &offset_bx);
 154                                 if (ret == -1) {
 155                                         diff = 0;
 156                                         break;
 157                                 }
 158                         }
 159                         diff = 1;
 160                         break;
 161                 }
 162                 if (estack_bx(stack, top)->u.s.literal_type ==
 163                                 ESTACK_STRING_LITERAL_TYPE_PLAIN) {
 164                         ret = parse_char(estack_bx(stack, top),
 165                                 &char_bx, &offset_bx);
 166                         if (ret == -1) {
 167                                 diff = 0;
 168                                 break;
 169                         } else if (ret == -2) {
 170                                 escaped_r0 = 1;
 171                         }
 172                         /* else compare both char */
 173                 }
 174                 if (estack_ax(stack, top)->u.s.literal_type ==
 175                                 ESTACK_STRING_LITERAL_TYPE_PLAIN) {
 176                         ret = parse_char(estack_ax(stack, top),
 177                                 &char_ax, &offset_ax);
 178                         if (ret == -1) {
 179                                 diff = 0;
 180                                 break;
 181                         } else if (ret == -2) {
 182                                 if (!escaped_r0) {
 183                                         diff = -1;
 184                                         break;
 185                                 }
 186                         } else {
 187                                 if (escaped_r0) {
 188                                         diff = 1;
 189                                         break;
 190                                 }
 191                         }
 192                 } else {
 193                         if (escaped_r0) {
 194                                 diff = 1;
 195                                 break;
 196                         }
 197                 }
 198                 diff = char_bx - char_ax;
 199                 if (diff != 0)
 200                         break;
 201                 offset_bx++;
 202                 offset_ax++;
 203         }
 204         if (has_user)
 205                 pagefault_enable();
 206
 207         return diff;
 208 }
 209
 210 uint64_t lttng_bytecode_filter_interpret_false(void *filter_data,
 211                 struct lttng_probe_ctx *lttng_probe_ctx,
 212                 const char *filter_stack_data)
 213 {
 214         return LTTNG_INTERPRETER_DISCARD;
 215 }
 216
 217 #ifdef INTERPRETER_USE_SWITCH
 218
 219 /*
 220  * Fallback for compilers that do not support taking address of labels.
 221  */
 222
 223 #define START_OP                                                        \
 224         start_pc = &bytecode->data[0];                                  \
 225         for (pc = next_pc = start_pc; pc - start_pc < bytecode->len;    \
 226                         pc = next_pc) {                                 \
 227                 dbg_printk("LTTng: Executing op %s (%u)\n",             \
 228                         lttng_bytecode_print_op((unsigned int) *(bytecode_opcode_t *) pc), \
 229                         (unsigned int) *(bytecode_opcode_t *) pc);      \
 230                 switch (*(bytecode_opcode_t *) pc)      {
 231
 232 #define OP(name)        case name
 233
 234 #define PO              break
 235
 236 #define END_OP          }                                               \
 237         }
 238
 239 #else
 240
 241 /*
 242  * Dispatch-table based interpreter.
 243  */
 244
 245 #define START_OP                                                        \
 246         start_pc = &bytecode->code[0];                                  \
 247         pc = next_pc = start_pc;                                        \
 248         if (unlikely(pc - start_pc >= bytecode->len))                   \
 249                 goto end;                                               \
 250         goto *dispatch[*(bytecode_opcode_t *) pc];
 251
 252 #define OP(name)                                                        \
 253 LABEL_##name
 254
 255 #define PO                                                              \
 256                 pc = next_pc;                                           \
 257                 goto *dispatch[*(bytecode_opcode_t *) pc];
 258
 259 #define END_OP
 260
 261 #endif
 262
 263 #define IS_INTEGER_REGISTER(reg_type) \
 264                 (reg_type == REG_S64 || reg_type == REG_U64)
 265
 266 static int context_get_index(struct lttng_probe_ctx *lttng_probe_ctx,
 267                 struct load_ptr *ptr,
 268                 uint32_t idx)
 269 {
 270
 271         struct lttng_ctx_field *ctx_field;
 272         struct lttng_event_field *field;
 273         union lttng_ctx_value v;
 274
 275         ctx_field = &lttng_static_ctx->fields[idx];
 276         field = &ctx_field->event_field;
 277         ptr->type = LOAD_OBJECT;
 278         /* field is only used for types nested within variants. */
 279         ptr->field = NULL;
 280
 281         switch (field->type.atype) {
 282         case atype_integer:
 283                 ctx_field->get_value(ctx_field, lttng_probe_ctx, &v);
 284                 if (field->type.u.integer.signedness) {
 285                         ptr->object_type = OBJECT_TYPE_S64;
 286                         ptr->u.s64 = v.s64;
 287                         ptr->ptr = &ptr->u.s64;
 288                 } else {
 289                         ptr->object_type = OBJECT_TYPE_U64;
 290                         ptr->u.u64 = v.s64;     /* Cast. */
 291                         ptr->ptr = &ptr->u.u64;
 292                 }
 293                 break;
 294         case atype_enum_nestable:
 295         {
 296                 const struct lttng_integer_type *itype =
 297                         &field->type.u.enum_nestable.container_type->u.integer;
 298
 299                 ctx_field->get_value(ctx_field, lttng_probe_ctx, &v);
 300                 if (itype->signedness) {
 301                         ptr->object_type = OBJECT_TYPE_S64;
 302                         ptr->u.s64 = v.s64;
 303                         ptr->ptr = &ptr->u.s64;
 304                 } else {
 305                         ptr->object_type = OBJECT_TYPE_U64;
 306                         ptr->u.u64 = v.s64;     /* Cast. */
 307                         ptr->ptr = &ptr->u.u64;
 308                 }
 309                 break;
 310         }
 311         case atype_array_nestable:
 312                 if (!lttng_is_bytewise_integer(field->type.u.array_nestable.elem_type)) {
 313                         printk(KERN_WARNING "LTTng: bytecode: Array nesting only supports integer types.\n");
 314                         return -EINVAL;
 315                 }
 316                 if (field->type.u.array_nestable.elem_type->u.integer.encoding == lttng_encode_none) {
 317                         printk(KERN_WARNING "LTTng: bytecode: Only string arrays are supported for contexts.\n");
 318                         return -EINVAL;
 319                 }
 320                 ptr->object_type = OBJECT_TYPE_STRING;
 321                 ctx_field->get_value(ctx_field, lttng_probe_ctx, &v);
 322                 ptr->ptr = v.str;
 323                 break;
 324         case atype_sequence_nestable:
 325                 if (!lttng_is_bytewise_integer(field->type.u.sequence_nestable.elem_type)) {
 326                         printk(KERN_WARNING "LTTng: bytecode: Sequence nesting only supports integer types.\n");
 327                         return -EINVAL;
 328                 }
 329                 if (field->type.u.sequence_nestable.elem_type->u.integer.encoding == lttng_encode_none) {
 330                         printk(KERN_WARNING "LTTng: bytecode: Only string sequences are supported for contexts.\n");
 331                         return -EINVAL;
 332                 }
 333                 ptr->object_type = OBJECT_TYPE_STRING;
 334                 ctx_field->get_value(ctx_field, lttng_probe_ctx, &v);
 335                 ptr->ptr = v.str;
 336                 break;
 337         case atype_string:
 338                 ptr->object_type = OBJECT_TYPE_STRING;
 339                 ctx_field->get_value(ctx_field, lttng_probe_ctx, &v);
 340                 ptr->ptr = v.str;
 341                 break;
 342         case atype_struct_nestable:
 343                 printk(KERN_WARNING "LTTng: bytecode: Structure type cannot be loaded.\n");
 344                 return -EINVAL;
 345         case atype_variant_nestable:
 346                 printk(KERN_WARNING "LTTng: bytecode: Variant type cannot be loaded.\n");
 347                 return -EINVAL;
 348         default:
 349                 printk(KERN_WARNING "LTTng: bytecode: Unknown type: %d", (int) field->type.atype);
 350                 return -EINVAL;
 351         }
 352         return 0;
 353 }
 354
 355 static int dynamic_get_index(struct lttng_probe_ctx *lttng_probe_ctx,
 356                 struct bytecode_runtime *runtime,
 357                 uint64_t index, struct estack_entry *stack_top)
 358 {
 359         int ret;
 360         const struct bytecode_get_index_data *gid;
 361
 362         gid = (const struct bytecode_get_index_data *) &runtime->data[index];
 363         switch (stack_top->u.ptr.type) {
 364         case LOAD_OBJECT:
 365                 switch (stack_top->u.ptr.object_type) {
 366                 case OBJECT_TYPE_ARRAY:
 367                 {
 368                         const char *ptr;
 369
 370                         WARN_ON_ONCE(gid->offset >= gid->array_len);
 371                         /* Skip count (unsigned long) */
 372                         ptr = *(const char **) (stack_top->u.ptr.ptr + sizeof(unsigned long));
 373                         ptr = ptr + gid->offset;
 374                         stack_top->u.ptr.ptr = ptr;
 375                         stack_top->u.ptr.object_type = gid->elem.type;
 376                         stack_top->u.ptr.rev_bo = gid->elem.rev_bo;
 377                         BUG_ON(stack_top->u.ptr.field->type.atype != atype_array_nestable);
 378                         stack_top->u.ptr.field = NULL;
 379                         break;
 380                 }
 381                 case OBJECT_TYPE_SEQUENCE:
 382                 {
 383                         const char *ptr;
 384                         size_t ptr_seq_len;
 385
 386                         ptr = *(const char **) (stack_top->u.ptr.ptr + sizeof(unsigned long));
 387                         ptr_seq_len = *(unsigned long *) stack_top->u.ptr.ptr;
 388                         if (gid->offset >= gid->elem.len * ptr_seq_len) {
 389                                 ret = -EINVAL;
 390                                 goto end;
 391                         }
 392                         ptr = ptr + gid->offset;
 393                         stack_top->u.ptr.ptr = ptr;
 394                         stack_top->u.ptr.object_type = gid->elem.type;
 395                         stack_top->u.ptr.rev_bo = gid->elem.rev_bo;
 396                         BUG_ON(stack_top->u.ptr.field->type.atype != atype_sequence_nestable);
 397                         stack_top->u.ptr.field = NULL;
 398                         break;
 399                 }
 400                 case OBJECT_TYPE_STRUCT:
 401                         printk(KERN_WARNING "LTTng: bytecode: Nested structures are not supported yet.\n");
 402                         ret = -EINVAL;
 403                         goto end;
 404                 case OBJECT_TYPE_VARIANT:
 405                 default:
 406                         printk(KERN_WARNING "LTTng: bytecode: Unexpected get index type %d",
 407                                 (int) stack_top->u.ptr.object_type);
 408                         ret = -EINVAL;
 409                         goto end;
 410                 }
 411                 break;
 412         case LOAD_ROOT_CONTEXT:
 413         case LOAD_ROOT_APP_CONTEXT:     /* Fall-through */
 414         {
 415                 ret = context_get_index(lttng_probe_ctx,
 416                                 &stack_top->u.ptr,
 417                                 gid->ctx_index);
 418                 if (ret) {
 419                         goto end;
 420                 }
 421                 break;
 422         }
 423         case LOAD_ROOT_PAYLOAD:
 424                 stack_top->u.ptr.ptr += gid->offset;
 425                 if (gid->elem.type == OBJECT_TYPE_STRING)
 426                         stack_top->u.ptr.ptr = *(const char * const *) stack_top->u.ptr.ptr;
 427                 stack_top->u.ptr.object_type = gid->elem.type;
 428                 stack_top->u.ptr.type = LOAD_OBJECT;
 429                 stack_top->u.ptr.field = gid->field;
 430                 stack_top->u.ptr.rev_bo = gid->elem.rev_bo;
 431                 break;
 432         }
 433
 434         stack_top->type = REG_PTR;
 435
 436         return 0;
 437
 438 end:
 439         return ret;
 440 }
 441
 442 static int dynamic_load_field(struct estack_entry *stack_top)
 443 {
 444         int ret;
 445
 446         switch (stack_top->u.ptr.type) {
 447         case LOAD_OBJECT:
 448                 break;
 449         case LOAD_ROOT_CONTEXT:
 450         case LOAD_ROOT_APP_CONTEXT:
 451         case LOAD_ROOT_PAYLOAD:
 452         default:
 453                 dbg_printk("Bytecode warning: cannot load root, missing field name.\n");
 454                 ret = -EINVAL;
 455                 goto end;
 456         }
 457         switch (stack_top->u.ptr.object_type) {
 458         case OBJECT_TYPE_S8:
 459                 dbg_printk("op load field s8\n");
 460                 stack_top->u.v = *(int8_t *) stack_top->u.ptr.ptr;
 461                 stack_top->type = REG_S64;
 462                 break;
 463         case OBJECT_TYPE_S16:
 464         {
 465                 int16_t tmp;
 466
 467                 dbg_printk("op load field s16\n");
 468                 tmp = *(int16_t *) stack_top->u.ptr.ptr;
 469                 if (stack_top->u.ptr.rev_bo)
 470                         __swab16s(&tmp);
 471                 stack_top->u.v = tmp;
 472                 stack_top->type = REG_S64;
 473                 break;
 474         }
 475         case OBJECT_TYPE_S32:
 476         {
 477                 int32_t tmp;
 478
 479                 dbg_printk("op load field s32\n");
 480                 tmp = *(int32_t *) stack_top->u.ptr.ptr;
 481                 if (stack_top->u.ptr.rev_bo)
 482                         __swab32s(&tmp);
 483                 stack_top->u.v = tmp;
 484                 stack_top->type = REG_S64;
 485                 break;
 486         }
 487         case OBJECT_TYPE_S64:
 488         {
 489                 int64_t tmp;
 490
 491                 dbg_printk("op load field s64\n");
 492                 tmp = *(int64_t *) stack_top->u.ptr.ptr;
 493                 if (stack_top->u.ptr.rev_bo)
 494                         __swab64s(&tmp);
 495                 stack_top->u.v = tmp;
 496                 stack_top->type = REG_S64;
 497                 break;
 498         }
 499         case OBJECT_TYPE_U8:
 500                 dbg_printk("op load field u8\n");
 501                 stack_top->u.v = *(uint8_t *) stack_top->u.ptr.ptr;
 502                 stack_top->type = REG_U64;
 503                 break;
 504         case OBJECT_TYPE_U16:
 505         {
 506                 uint16_t tmp;
 507
 508                 dbg_printk("op load field u16\n");
 509                 tmp = *(uint16_t *) stack_top->u.ptr.ptr;
 510                 if (stack_top->u.ptr.rev_bo)
 511                         __swab16s(&tmp);
 512                 stack_top->u.v = tmp;
 513                 stack_top->type = REG_U64;
 514                 break;
 515         }
 516         case OBJECT_TYPE_U32:
 517         {
 518                 uint32_t tmp;
 519
 520                 dbg_printk("op load field u32\n");
 521                 tmp = *(uint32_t *) stack_top->u.ptr.ptr;
 522                 if (stack_top->u.ptr.rev_bo)
 523                         __swab32s(&tmp);
 524                 stack_top->u.v = tmp;
 525                 stack_top->type = REG_U64;
 526                 break;
 527         }
 528         case OBJECT_TYPE_U64:
 529         {
 530                 uint64_t tmp;
 531
 532                 dbg_printk("op load field u64\n");
 533                 tmp = *(uint64_t *) stack_top->u.ptr.ptr;
 534                 if (stack_top->u.ptr.rev_bo)
 535                         __swab64s(&tmp);
 536                 stack_top->u.v = tmp;
 537                 stack_top->type = REG_U64;
 538                 break;
 539         }
 540         case OBJECT_TYPE_STRING:
 541         {
 542                 const char *str;
 543
 544                 dbg_printk("op load field string\n");
 545                 str = (const char *) stack_top->u.ptr.ptr;
 546                 stack_top->u.s.str = str;
 547                 if (unlikely(!stack_top->u.s.str)) {
 548                         dbg_printk("Bytecode warning: loading a NULL string.\n");
 549                         ret = -EINVAL;
 550                         goto end;
 551                 }
 552                 stack_top->u.s.seq_len = LTTNG_SIZE_MAX;
 553                 stack_top->u.s.literal_type =
 554                         ESTACK_STRING_LITERAL_TYPE_NONE;
 555                 stack_top->type = REG_STRING;
 556                 break;
 557         }
 558         case OBJECT_TYPE_STRING_SEQUENCE:
 559         {
 560                 const char *ptr;
 561
 562                 dbg_printk("op load field string sequence\n");
 563                 ptr = stack_top->u.ptr.ptr;
 564                 stack_top->u.s.seq_len = *(unsigned long *) ptr;
 565                 stack_top->u.s.str = *(const char **) (ptr + sizeof(unsigned long));
 566                 if (unlikely(!stack_top->u.s.str)) {
 567                         dbg_printk("Bytecode warning: loading a NULL sequence.\n");
 568                         ret = -EINVAL;
 569                         goto end;
 570                 }
 571                 stack_top->u.s.literal_type =
 572                         ESTACK_STRING_LITERAL_TYPE_NONE;
 573                 stack_top->type = REG_STRING;
 574                 break;
 575         }
 576         case OBJECT_TYPE_DYNAMIC:
 577                 /*
 578                  * Dynamic types in context are looked up
 579                  * by context get index.
 580                  */
 581                 ret = -EINVAL;
 582                 goto end;
 583         case OBJECT_TYPE_DOUBLE:
 584                 ret = -EINVAL;
 585                 goto end;
 586         case OBJECT_TYPE_SEQUENCE:
 587         case OBJECT_TYPE_ARRAY:
 588         case OBJECT_TYPE_STRUCT:
 589         case OBJECT_TYPE_VARIANT:
 590                 printk(KERN_WARNING "LTTng: bytecode: Sequences, arrays, struct and variant cannot be loaded (nested types).\n");
 591                 ret = -EINVAL;
 592                 goto end;
 593         }
 594         return 0;
 595
 596 end:
 597         return ret;
 598 }
 599
 600 static
 601 int lttng_bytecode_interpret_format_output(struct estack_entry *ax,
 602                 struct lttng_interpreter_output *output)
 603 {
 604         int ret;
 605
 606 again:
 607         switch (ax->type) {
 608         case REG_S64:
 609                 output->type = LTTNG_INTERPRETER_TYPE_S64;
 610                 output->u.s = ax->u.v;
 611                 break;
 612         case REG_U64:
 613                 output->type = LTTNG_INTERPRETER_TYPE_U64;
 614                 output->u.u = (uint64_t) ax->u.v;
 615                 break;
 616         case REG_STRING:
 617                 output->type = LTTNG_INTERPRETER_TYPE_STRING;
 618                 output->u.str.str = ax->u.s.str;
 619                 output->u.str.len = ax->u.s.seq_len;
 620                 break;
 621         case REG_PTR:
 622                 switch (ax->u.ptr.object_type) {
 623                 case OBJECT_TYPE_S8:
 624                 case OBJECT_TYPE_S16:
 625                 case OBJECT_TYPE_S32:
 626                 case OBJECT_TYPE_S64:
 627                 case OBJECT_TYPE_U8:
 628                 case OBJECT_TYPE_U16:
 629                 case OBJECT_TYPE_U32:
 630                 case OBJECT_TYPE_U64:
 631                 case OBJECT_TYPE_DOUBLE:
 632                 case OBJECT_TYPE_STRING:
 633                 case OBJECT_TYPE_STRING_SEQUENCE:
 634                         ret = dynamic_load_field(ax);
 635                         if (ret)
 636                                 return ret;
 637                         /* Retry after loading ptr into stack top. */
 638                         goto again;
 639                 case OBJECT_TYPE_SEQUENCE:
 640                         output->type = LTTNG_INTERPRETER_TYPE_SEQUENCE;
 641                         output->u.sequence.ptr = *(const char **) (ax->u.ptr.ptr + sizeof(unsigned long));
 642                         output->u.sequence.nr_elem = *(unsigned long *) ax->u.ptr.ptr;
 643                         output->u.sequence.nested_type = ax->u.ptr.field->type.u.sequence_nestable.elem_type;
 644                         break;
 645                 case OBJECT_TYPE_ARRAY:
 646                         /* Skip count (unsigned long) */
 647                         output->type = LTTNG_INTERPRETER_TYPE_SEQUENCE;
 648                         output->u.sequence.ptr = *(const char **) (ax->u.ptr.ptr + sizeof(unsigned long));
 649                         output->u.sequence.nr_elem = ax->u.ptr.field->type.u.array_nestable.length;
 650                         output->u.sequence.nested_type = ax->u.ptr.field->type.u.array_nestable.elem_type;
 651                         break;
 652                 case OBJECT_TYPE_STRUCT:
 653                 case OBJECT_TYPE_VARIANT:
 654                 default:
 655                         return -EINVAL;
 656                 }
 657
 658                 break;
 659         case REG_STAR_GLOB_STRING:
 660         case REG_TYPE_UNKNOWN:
 661         default:
 662                 return -EINVAL;
 663         }
 664
 665         return LTTNG_INTERPRETER_RECORD_FLAG;
 666 }
 667
 668 /*
 669  * Return 0 (discard), or raise the 0x1 flag (log event).
 670  * Currently, other flags are kept for future extensions and have no
 671  * effect.
 672  */
 673 static
 674 uint64_t bytecode_interpret(void *interpreter_data,
 675                 struct lttng_probe_ctx *lttng_probe_ctx,
 676                 const char *interpreter_stack_data,
 677                 struct lttng_interpreter_output *output)
 678 {
 679         struct bytecode_runtime *bytecode = interpreter_data;
 680         void *pc, *next_pc, *start_pc;
 681         int ret = -EINVAL;
 682         uint64_t retval = 0;
 683         struct estack _stack;
 684         struct estack *stack = &_stack;
 685         register int64_t ax = 0, bx = 0;
 686         register enum entry_type ax_t = REG_TYPE_UNKNOWN, bx_t = REG_TYPE_UNKNOWN;
 687         register int top = INTERPRETER_STACK_EMPTY;
 688 #ifndef INTERPRETER_USE_SWITCH
 689         static void *dispatch[NR_BYTECODE_OPS] = {
 690                 [ BYTECODE_OP_UNKNOWN ] = &&LABEL_BYTECODE_OP_UNKNOWN,
 691
 692                 [ BYTECODE_OP_RETURN ] = &&LABEL_BYTECODE_OP_RETURN,
 693
 694                 /* binary */
 695                 [ BYTECODE_OP_MUL ] = &&LABEL_BYTECODE_OP_MUL,
 696                 [ BYTECODE_OP_DIV ] = &&LABEL_BYTECODE_OP_DIV,
 697                 [ BYTECODE_OP_MOD ] = &&LABEL_BYTECODE_OP_MOD,
 698                 [ BYTECODE_OP_PLUS ] = &&LABEL_BYTECODE_OP_PLUS,
 699                 [ BYTECODE_OP_MINUS ] = &&LABEL_BYTECODE_OP_MINUS,
 700                 [ BYTECODE_OP_BIT_RSHIFT ] = &&LABEL_BYTECODE_OP_BIT_RSHIFT,
 701                 [ BYTECODE_OP_BIT_LSHIFT ] = &&LABEL_BYTECODE_OP_BIT_LSHIFT,
 702                 [ BYTECODE_OP_BIT_AND ] = &&LABEL_BYTECODE_OP_BIT_AND,
 703                 [ BYTECODE_OP_BIT_OR ] = &&LABEL_BYTECODE_OP_BIT_OR,
 704                 [ BYTECODE_OP_BIT_XOR ] = &&LABEL_BYTECODE_OP_BIT_XOR,
 705
 706                 /* binary comparators */
 707                 [ BYTECODE_OP_EQ ] = &&LABEL_BYTECODE_OP_EQ,
 708                 [ BYTECODE_OP_NE ] = &&LABEL_BYTECODE_OP_NE,
 709                 [ BYTECODE_OP_GT ] = &&LABEL_BYTECODE_OP_GT,
 710                 [ BYTECODE_OP_LT ] = &&LABEL_BYTECODE_OP_LT,
 711                 [ BYTECODE_OP_GE ] = &&LABEL_BYTECODE_OP_GE,
 712                 [ BYTECODE_OP_LE ] = &&LABEL_BYTECODE_OP_LE,
 713
 714                 /* string binary comparator */
 715                 [ BYTECODE_OP_EQ_STRING ] = &&LABEL_BYTECODE_OP_EQ_STRING,
 716                 [ BYTECODE_OP_NE_STRING ] = &&LABEL_BYTECODE_OP_NE_STRING,
 717                 [ BYTECODE_OP_GT_STRING ] = &&LABEL_BYTECODE_OP_GT_STRING,
 718                 [ BYTECODE_OP_LT_STRING ] = &&LABEL_BYTECODE_OP_LT_STRING,
 719                 [ BYTECODE_OP_GE_STRING ] = &&LABEL_BYTECODE_OP_GE_STRING,
 720                 [ BYTECODE_OP_LE_STRING ] = &&LABEL_BYTECODE_OP_LE_STRING,
 721
 722                 /* globbing pattern binary comparator */
 723                 [ BYTECODE_OP_EQ_STAR_GLOB_STRING ] = &&LABEL_BYTECODE_OP_EQ_STAR_GLOB_STRING,
 724                 [ BYTECODE_OP_NE_STAR_GLOB_STRING ] = &&LABEL_BYTECODE_OP_NE_STAR_GLOB_STRING,
 725
 726                 /* s64 binary comparator */
 727                 [ BYTECODE_OP_EQ_S64 ] = &&LABEL_BYTECODE_OP_EQ_S64,
 728                 [ BYTECODE_OP_NE_S64 ] = &&LABEL_BYTECODE_OP_NE_S64,
 729                 [ BYTECODE_OP_GT_S64 ] = &&LABEL_BYTECODE_OP_GT_S64,
 730                 [ BYTECODE_OP_LT_S64 ] = &&LABEL_BYTECODE_OP_LT_S64,
 731                 [ BYTECODE_OP_GE_S64 ] = &&LABEL_BYTECODE_OP_GE_S64,
 732                 [ BYTECODE_OP_LE_S64 ] = &&LABEL_BYTECODE_OP_LE_S64,
 733
 734                 /* double binary comparator */
 735                 [ BYTECODE_OP_EQ_DOUBLE ] = &&LABEL_BYTECODE_OP_EQ_DOUBLE,
 736                 [ BYTECODE_OP_NE_DOUBLE ] = &&LABEL_BYTECODE_OP_NE_DOUBLE,
 737                 [ BYTECODE_OP_GT_DOUBLE ] = &&LABEL_BYTECODE_OP_GT_DOUBLE,
 738                 [ BYTECODE_OP_LT_DOUBLE ] = &&LABEL_BYTECODE_OP_LT_DOUBLE,
 739                 [ BYTECODE_OP_GE_DOUBLE ] = &&LABEL_BYTECODE_OP_GE_DOUBLE,
 740                 [ BYTECODE_OP_LE_DOUBLE ] = &&LABEL_BYTECODE_OP_LE_DOUBLE,
 741
 742                 /* Mixed S64-double binary comparators */
 743                 [ BYTECODE_OP_EQ_DOUBLE_S64 ] = &&LABEL_BYTECODE_OP_EQ_DOUBLE_S64,
 744                 [ BYTECODE_OP_NE_DOUBLE_S64 ] = &&LABEL_BYTECODE_OP_NE_DOUBLE_S64,
 745                 [ BYTECODE_OP_GT_DOUBLE_S64 ] = &&LABEL_BYTECODE_OP_GT_DOUBLE_S64,
 746                 [ BYTECODE_OP_LT_DOUBLE_S64 ] = &&LABEL_BYTECODE_OP_LT_DOUBLE_S64,
 747                 [ BYTECODE_OP_GE_DOUBLE_S64 ] = &&LABEL_BYTECODE_OP_GE_DOUBLE_S64,
 748                 [ BYTECODE_OP_LE_DOUBLE_S64 ] = &&LABEL_BYTECODE_OP_LE_DOUBLE_S64,
 749
 750                 [ BYTECODE_OP_EQ_S64_DOUBLE ] = &&LABEL_BYTECODE_OP_EQ_S64_DOUBLE,
 751                 [ BYTECODE_OP_NE_S64_DOUBLE ] = &&LABEL_BYTECODE_OP_NE_S64_DOUBLE,
 752                 [ BYTECODE_OP_GT_S64_DOUBLE ] = &&LABEL_BYTECODE_OP_GT_S64_DOUBLE,
 753                 [ BYTECODE_OP_LT_S64_DOUBLE ] = &&LABEL_BYTECODE_OP_LT_S64_DOUBLE,
 754                 [ BYTECODE_OP_GE_S64_DOUBLE ] = &&LABEL_BYTECODE_OP_GE_S64_DOUBLE,
 755                 [ BYTECODE_OP_LE_S64_DOUBLE ] = &&LABEL_BYTECODE_OP_LE_S64_DOUBLE,
 756
 757                 /* unary */
 758                 [ BYTECODE_OP_UNARY_PLUS ] = &&LABEL_BYTECODE_OP_UNARY_PLUS,
 759                 [ BYTECODE_OP_UNARY_MINUS ] = &&LABEL_BYTECODE_OP_UNARY_MINUS,
 760                 [ BYTECODE_OP_UNARY_NOT ] = &&LABEL_BYTECODE_OP_UNARY_NOT,
 761                 [ BYTECODE_OP_UNARY_PLUS_S64 ] = &&LABEL_BYTECODE_OP_UNARY_PLUS_S64,
 762                 [ BYTECODE_OP_UNARY_MINUS_S64 ] = &&LABEL_BYTECODE_OP_UNARY_MINUS_S64,
 763                 [ BYTECODE_OP_UNARY_NOT_S64 ] = &&LABEL_BYTECODE_OP_UNARY_NOT_S64,
 764                 [ BYTECODE_OP_UNARY_PLUS_DOUBLE ] = &&LABEL_BYTECODE_OP_UNARY_PLUS_DOUBLE,
 765                 [ BYTECODE_OP_UNARY_MINUS_DOUBLE ] = &&LABEL_BYTECODE_OP_UNARY_MINUS_DOUBLE,
 766                 [ BYTECODE_OP_UNARY_NOT_DOUBLE ] = &&LABEL_BYTECODE_OP_UNARY_NOT_DOUBLE,
 767
 768                 /* logical */
 769                 [ BYTECODE_OP_AND ] = &&LABEL_BYTECODE_OP_AND,
 770                 [ BYTECODE_OP_OR ] = &&LABEL_BYTECODE_OP_OR,
 771
 772                 /* load field ref */
 773                 [ BYTECODE_OP_LOAD_FIELD_REF ] = &&LABEL_BYTECODE_OP_LOAD_FIELD_REF,
 774                 [ BYTECODE_OP_LOAD_FIELD_REF_STRING ] = &&LABEL_BYTECODE_OP_LOAD_FIELD_REF_STRING,
 775                 [ BYTECODE_OP_LOAD_FIELD_REF_SEQUENCE ] = &&LABEL_BYTECODE_OP_LOAD_FIELD_REF_SEQUENCE,
 776                 [ BYTECODE_OP_LOAD_FIELD_REF_S64 ] = &&LABEL_BYTECODE_OP_LOAD_FIELD_REF_S64,
 777                 [ BYTECODE_OP_LOAD_FIELD_REF_DOUBLE ] = &&LABEL_BYTECODE_OP_LOAD_FIELD_REF_DOUBLE,
 778
 779                 /* load from immediate operand */
 780                 [ BYTECODE_OP_LOAD_STRING ] = &&LABEL_BYTECODE_OP_LOAD_STRING,
 781                 [ BYTECODE_OP_LOAD_STAR_GLOB_STRING ] = &&LABEL_BYTECODE_OP_LOAD_STAR_GLOB_STRING,
 782                 [ BYTECODE_OP_LOAD_S64 ] = &&LABEL_BYTECODE_OP_LOAD_S64,
 783                 [ BYTECODE_OP_LOAD_DOUBLE ] = &&LABEL_BYTECODE_OP_LOAD_DOUBLE,
 784
 785                 /* cast */
 786                 [ BYTECODE_OP_CAST_TO_S64 ] = &&LABEL_BYTECODE_OP_CAST_TO_S64,
 787                 [ BYTECODE_OP_CAST_DOUBLE_TO_S64 ] = &&LABEL_BYTECODE_OP_CAST_DOUBLE_TO_S64,
 788                 [ BYTECODE_OP_CAST_NOP ] = &&LABEL_BYTECODE_OP_CAST_NOP,
 789
 790                 /* get context ref */
 791                 [ BYTECODE_OP_GET_CONTEXT_REF ] = &&LABEL_BYTECODE_OP_GET_CONTEXT_REF,
 792                 [ BYTECODE_OP_GET_CONTEXT_REF_STRING ] = &&LABEL_BYTECODE_OP_GET_CONTEXT_REF_STRING,
 793                 [ BYTECODE_OP_GET_CONTEXT_REF_S64 ] = &&LABEL_BYTECODE_OP_GET_CONTEXT_REF_S64,
 794                 [ BYTECODE_OP_GET_CONTEXT_REF_DOUBLE ] = &&LABEL_BYTECODE_OP_GET_CONTEXT_REF_DOUBLE,
 795
 796                 /* load userspace field ref */
 797                 [ BYTECODE_OP_LOAD_FIELD_REF_USER_STRING ] = &&LABEL_BYTECODE_OP_LOAD_FIELD_REF_USER_STRING,
 798                 [ BYTECODE_OP_LOAD_FIELD_REF_USER_SEQUENCE ] = &&LABEL_BYTECODE_OP_LOAD_FIELD_REF_USER_SEQUENCE,
 799
 800                 /* Instructions for recursive traversal through composed types. */
 801                 [ BYTECODE_OP_GET_CONTEXT_ROOT ] = &&LABEL_BYTECODE_OP_GET_CONTEXT_ROOT,
 802                 [ BYTECODE_OP_GET_APP_CONTEXT_ROOT ] = &&LABEL_BYTECODE_OP_GET_APP_CONTEXT_ROOT,
 803                 [ BYTECODE_OP_GET_PAYLOAD_ROOT ] = &&LABEL_BYTECODE_OP_GET_PAYLOAD_ROOT,
 804
 805                 [ BYTECODE_OP_GET_SYMBOL ] = &&LABEL_BYTECODE_OP_GET_SYMBOL,
 806                 [ BYTECODE_OP_GET_SYMBOL_FIELD ] = &&LABEL_BYTECODE_OP_GET_SYMBOL_FIELD,
 807                 [ BYTECODE_OP_GET_INDEX_U16 ] = &&LABEL_BYTECODE_OP_GET_INDEX_U16,
 808                 [ BYTECODE_OP_GET_INDEX_U64 ] = &&LABEL_BYTECODE_OP_GET_INDEX_U64,
 809
 810                 [ BYTECODE_OP_LOAD_FIELD ] = &&LABEL_BYTECODE_OP_LOAD_FIELD,
 811                 [ BYTECODE_OP_LOAD_FIELD_S8      ] = &&LABEL_BYTECODE_OP_LOAD_FIELD_S8,
 812                 [ BYTECODE_OP_LOAD_FIELD_S16 ] = &&LABEL_BYTECODE_OP_LOAD_FIELD_S16,
 813                 [ BYTECODE_OP_LOAD_FIELD_S32 ] = &&LABEL_BYTECODE_OP_LOAD_FIELD_S32,
 814                 [ BYTECODE_OP_LOAD_FIELD_S64 ] = &&LABEL_BYTECODE_OP_LOAD_FIELD_S64,
 815                 [ BYTECODE_OP_LOAD_FIELD_U8 ] = &&LABEL_BYTECODE_OP_LOAD_FIELD_U8,
 816                 [ BYTECODE_OP_LOAD_FIELD_U16 ] = &&LABEL_BYTECODE_OP_LOAD_FIELD_U16,
 817                 [ BYTECODE_OP_LOAD_FIELD_U32 ] = &&LABEL_BYTECODE_OP_LOAD_FIELD_U32,
 818                 [ BYTECODE_OP_LOAD_FIELD_U64 ] = &&LABEL_BYTECODE_OP_LOAD_FIELD_U64,
 819                 [ BYTECODE_OP_LOAD_FIELD_STRING ] = &&LABEL_BYTECODE_OP_LOAD_FIELD_STRING,
 820                 [ BYTECODE_OP_LOAD_FIELD_SEQUENCE ] = &&LABEL_BYTECODE_OP_LOAD_FIELD_SEQUENCE,
 821                 [ BYTECODE_OP_LOAD_FIELD_DOUBLE ] = &&LABEL_BYTECODE_OP_LOAD_FIELD_DOUBLE,
 822
 823                 [ BYTECODE_OP_UNARY_BIT_NOT ] = &&LABEL_BYTECODE_OP_UNARY_BIT_NOT,
 824
 825                 [ BYTECODE_OP_RETURN_S64 ] = &&LABEL_BYTECODE_OP_RETURN_S64,
 826         };
 827 #endif /* #ifndef INTERPRETER_USE_SWITCH */
 828
 829         START_OP
 830
 831                 OP(BYTECODE_OP_UNKNOWN):
 832                 OP(BYTECODE_OP_LOAD_FIELD_REF):
 833                 OP(BYTECODE_OP_GET_CONTEXT_REF):
 834 #ifdef INTERPRETER_USE_SWITCH
 835                 default:
 836 #endif /* INTERPRETER_USE_SWITCH */
 837                         printk(KERN_WARNING "LTTng: bytecode: unknown bytecode op %u\n",
 838                                 (unsigned int) *(bytecode_opcode_t *) pc);
 839                         ret = -EINVAL;
 840                         goto end;
 841
 842                 OP(BYTECODE_OP_RETURN):
 843                 OP(BYTECODE_OP_RETURN_S64):
 844                         /* LTTNG_INTERPRETER_DISCARD or LTTNG_INTERPRETER_RECORD_FLAG */
 845                         switch (estack_ax_t) {
 846                         case REG_S64:
 847                         case REG_U64:
 848                                 retval = !!estack_ax_v;
 849                                 break;
 850                         case REG_DOUBLE:
 851                         case REG_STRING:
 852                         case REG_PTR:
 853                                 if (!output) {
 854                                         ret = -EINVAL;
 855                                         goto end;
 856                                 }
 857                                 retval = 0;
 858                                 break;
 859                         case REG_STAR_GLOB_STRING:
 860                         case REG_TYPE_UNKNOWN:
 861                                 ret = -EINVAL;
 862                                 goto end;
 863                         }
 864                         ret = 0;
 865                         goto end;
 866
 867                 /* binary */
 868                 OP(BYTECODE_OP_MUL):
 869                 OP(BYTECODE_OP_DIV):
 870                 OP(BYTECODE_OP_MOD):
 871                 OP(BYTECODE_OP_PLUS):
 872                 OP(BYTECODE_OP_MINUS):
 873                         printk(KERN_WARNING "LTTng: bytecode: unsupported bytecode op %u\n",
 874                                 (unsigned int) *(bytecode_opcode_t *) pc);
 875                         ret = -EINVAL;
 876                         goto end;
 877
 878                 OP(BYTECODE_OP_EQ):
 879                 OP(BYTECODE_OP_NE):
 880                 OP(BYTECODE_OP_GT):
 881                 OP(BYTECODE_OP_LT):
 882                 OP(BYTECODE_OP_GE):
 883                 OP(BYTECODE_OP_LE):
 884                         printk(KERN_WARNING "LTTng: bytecode: unsupported non-specialized bytecode op %u\n",
 885                                 (unsigned int) *(bytecode_opcode_t *) pc);
 886                         ret = -EINVAL;
 887                         goto end;
 888
 889                 OP(BYTECODE_OP_EQ_STRING):
 890                 {
 891                         int res;
 892
 893                         res = (stack_strcmp(stack, top, "==") == 0);
 894                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 895                         estack_ax_v = res;
 896                         estack_ax_t = REG_S64;
 897                         next_pc += sizeof(struct binary_op);
 898                         PO;
 899                 }
 900                 OP(BYTECODE_OP_NE_STRING):
 901                 {
 902                         int res;
 903
 904                         res = (stack_strcmp(stack, top, "!=") != 0);
 905                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 906                         estack_ax_v = res;
 907                         estack_ax_t = REG_S64;
 908                         next_pc += sizeof(struct binary_op);
 909                         PO;
 910                 }
 911                 OP(BYTECODE_OP_GT_STRING):
 912                 {
 913                         int res;
 914
 915                         res = (stack_strcmp(stack, top, ">") > 0);
 916                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 917                         estack_ax_v = res;
 918                         estack_ax_t = REG_S64;
 919                         next_pc += sizeof(struct binary_op);
 920                         PO;
 921                 }
 922                 OP(BYTECODE_OP_LT_STRING):
 923                 {
 924                         int res;
 925
 926                         res = (stack_strcmp(stack, top, "<") < 0);
 927                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 928                         estack_ax_v = res;
 929                         estack_ax_t = REG_S64;
 930                         next_pc += sizeof(struct binary_op);
 931                         PO;
 932                 }
 933                 OP(BYTECODE_OP_GE_STRING):
 934                 {
 935                         int res;
 936
 937                         res = (stack_strcmp(stack, top, ">=") >= 0);
 938                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 939                         estack_ax_v = res;
 940                         estack_ax_t = REG_S64;
 941                         next_pc += sizeof(struct binary_op);
 942                         PO;
 943                 }
 944                 OP(BYTECODE_OP_LE_STRING):
 945                 {
 946                         int res;
 947
 948                         res = (stack_strcmp(stack, top, "<=") <= 0);
 949                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 950                         estack_ax_v = res;
 951                         estack_ax_t = REG_S64;
 952                         next_pc += sizeof(struct binary_op);
 953                         PO;
 954                 }
 955
 956                 OP(BYTECODE_OP_EQ_STAR_GLOB_STRING):
 957                 {
 958                         int res;
 959
 960                         res = (stack_star_glob_match(stack, top, "==") == 0);
 961                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 962                         estack_ax_v = res;
 963                         estack_ax_t = REG_S64;
 964                         next_pc += sizeof(struct binary_op);
 965                         PO;
 966                 }
 967                 OP(BYTECODE_OP_NE_STAR_GLOB_STRING):
 968                 {
 969                         int res;
 970
 971                         res = (stack_star_glob_match(stack, top, "!=") != 0);
 972                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 973                         estack_ax_v = res;
 974                         estack_ax_t = REG_S64;
 975                         next_pc += sizeof(struct binary_op);
 976                         PO;
 977                 }
 978
 979                 OP(BYTECODE_OP_EQ_S64):
 980                 {
 981                         int res;
 982
 983                         res = (estack_bx_v == estack_ax_v);
 984                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 985                         estack_ax_v = res;
 986                         estack_ax_t = REG_S64;
 987                         next_pc += sizeof(struct binary_op);
 988                         PO;
 989                 }
 990                 OP(BYTECODE_OP_NE_S64):
 991                 {
 992                         int res;
 993
 994                         res = (estack_bx_v != estack_ax_v);
 995                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 996                         estack_ax_v = res;
 997                         estack_ax_t = REG_S64;
 998                         next_pc += sizeof(struct binary_op);
 999                         PO;
1000                 }
1001                 OP(BYTECODE_OP_GT_S64):
1002                 {
1003                         int res;
1004
1005                         res = (estack_bx_v > estack_ax_v);
1006                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
1007                         estack_ax_v = res;
1008                         estack_ax_t = REG_S64;
1009                         next_pc += sizeof(struct binary_op);
1010                         PO;
1011                 }
1012                 OP(BYTECODE_OP_LT_S64):
1013                 {
1014                         int res;
1015
1016                         res = (estack_bx_v < estack_ax_v);
1017                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
1018                         estack_ax_v = res;
1019                         estack_ax_t = REG_S64;
1020                         next_pc += sizeof(struct binary_op);
1021                         PO;
1022                 }
1023                 OP(BYTECODE_OP_GE_S64):
1024                 {
1025                         int res;
1026
1027                         res = (estack_bx_v >= estack_ax_v);
1028                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
1029                         estack_ax_v = res;
1030                         estack_ax_t = REG_S64;
1031                         next_pc += sizeof(struct binary_op);
1032                         PO;
1033                 }
1034                 OP(BYTECODE_OP_LE_S64):
1035                 {
1036                         int res;
1037
1038                         res = (estack_bx_v <= estack_ax_v);
1039                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
1040                         estack_ax_v = res;
1041                         estack_ax_t = REG_S64;
1042                         next_pc += sizeof(struct binary_op);
1043                         PO;
1044                 }
1045
1046                 OP(BYTECODE_OP_EQ_DOUBLE):
1047                 OP(BYTECODE_OP_NE_DOUBLE):
1048                 OP(BYTECODE_OP_GT_DOUBLE):
1049                 OP(BYTECODE_OP_LT_DOUBLE):
1050                 OP(BYTECODE_OP_GE_DOUBLE):
1051                 OP(BYTECODE_OP_LE_DOUBLE):
1052                 {
1053                         BUG_ON(1);
1054                         PO;
1055                 }
1056
1057                 /* Mixed S64-double binary comparators */
1058                 OP(BYTECODE_OP_EQ_DOUBLE_S64):
1059                 OP(BYTECODE_OP_NE_DOUBLE_S64):
1060                 OP(BYTECODE_OP_GT_DOUBLE_S64):
1061                 OP(BYTECODE_OP_LT_DOUBLE_S64):
1062                 OP(BYTECODE_OP_GE_DOUBLE_S64):
1063                 OP(BYTECODE_OP_LE_DOUBLE_S64):
1064                 OP(BYTECODE_OP_EQ_S64_DOUBLE):
1065                 OP(BYTECODE_OP_NE_S64_DOUBLE):
1066                 OP(BYTECODE_OP_GT_S64_DOUBLE):
1067                 OP(BYTECODE_OP_LT_S64_DOUBLE):
1068                 OP(BYTECODE_OP_GE_S64_DOUBLE):
1069                 OP(BYTECODE_OP_LE_S64_DOUBLE):
1070                 {
1071                         BUG_ON(1);
1072                         PO;
1073                 }
1074                 OP(BYTECODE_OP_BIT_RSHIFT):
1075                 {
1076                         int64_t res;
1077
1078                         if (!IS_INTEGER_REGISTER(estack_ax_t) || !IS_INTEGER_REGISTER(estack_bx_t)) {
1079                                 ret = -EINVAL;
1080                                 goto end;
1081                         }
1082
1083                         /* Catch undefined behavior. */
1084                         if (unlikely(estack_ax_v < 0 || estack_ax_v >= 64)) {
1085                                 ret = -EINVAL;
1086                                 goto end;
1087                         }
1088                         res = ((uint64_t) estack_bx_v >> (uint32_t) estack_ax_v);
1089                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
1090                         estack_ax_v = res;
1091                         estack_ax_t = REG_U64;
1092                         next_pc += sizeof(struct binary_op);
1093                         PO;
1094                 }
1095                 OP(BYTECODE_OP_BIT_LSHIFT):
1096                 {
1097                         int64_t res;
1098
1099                         if (!IS_INTEGER_REGISTER(estack_ax_t) || !IS_INTEGER_REGISTER(estack_bx_t)) {
1100                                 ret = -EINVAL;
1101                                 goto end;
1102                         }
1103
1104                         /* Catch undefined behavior. */
1105                         if (unlikely(estack_ax_v < 0 || estack_ax_v >= 64)) {
1106                                 ret = -EINVAL;
1107                                 goto end;
1108                         }
1109                         res = ((uint64_t) estack_bx_v << (uint32_t) estack_ax_v);
1110                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
1111                         estack_ax_v = res;
1112                         estack_ax_t = REG_U64;
1113                         next_pc += sizeof(struct binary_op);
1114                         PO;
1115                 }
1116                 OP(BYTECODE_OP_BIT_AND):
1117                 {
1118                         int64_t res;
1119
1120                         if (!IS_INTEGER_REGISTER(estack_ax_t) || !IS_INTEGER_REGISTER(estack_bx_t)) {
1121                                 ret = -EINVAL;
1122                                 goto end;
1123                         }
1124
1125                         res = ((uint64_t) estack_bx_v & (uint64_t) estack_ax_v);
1126                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
1127                         estack_ax_v = res;
1128                         estack_ax_t = REG_U64;
1129                         next_pc += sizeof(struct binary_op);
1130                         PO;
1131                 }
1132                 OP(BYTECODE_OP_BIT_OR):
1133                 {
1134                         int64_t res;
1135
1136                         if (!IS_INTEGER_REGISTER(estack_ax_t) || !IS_INTEGER_REGISTER(estack_bx_t)) {
1137                                 ret = -EINVAL;
1138                                 goto end;
1139                         }
1140
1141                         res = ((uint64_t) estack_bx_v | (uint64_t) estack_ax_v);
1142                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
1143                         estack_ax_v = res;
1144                         estack_ax_t = REG_U64;
1145                         next_pc += sizeof(struct binary_op);
1146                         PO;
1147                 }
1148                 OP(BYTECODE_OP_BIT_XOR):
1149                 {
1150                         int64_t res;
1151
1152                         if (!IS_INTEGER_REGISTER(estack_ax_t) || !IS_INTEGER_REGISTER(estack_bx_t)) {
1153                                 ret = -EINVAL;
1154                                 goto end;
1155                         }
1156
1157                         res = ((uint64_t) estack_bx_v ^ (uint64_t) estack_ax_v);
1158                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
1159                         estack_ax_v = res;
1160                         estack_ax_t = REG_U64;
1161                         next_pc += sizeof(struct binary_op);
1162                         PO;
1163                 }
1164
1165                 /* unary */
1166                 OP(BYTECODE_OP_UNARY_PLUS):
1167                 OP(BYTECODE_OP_UNARY_MINUS):
1168                 OP(BYTECODE_OP_UNARY_NOT):
1169                         printk(KERN_WARNING "LTTng: bytecode: unsupported non-specialized bytecode op %u\n",
1170                                 (unsigned int) *(bytecode_opcode_t *) pc);
1171                         ret = -EINVAL;
1172                         goto end;
1173
1174
1175                 OP(BYTECODE_OP_UNARY_BIT_NOT):
1176                 {
1177                         estack_ax_v = ~(uint64_t) estack_ax_v;
1178                         estack_ax_t = REG_S64;
1179                         next_pc += sizeof(struct unary_op);
1180                         PO;
1181                 }
1182
1183                 OP(BYTECODE_OP_UNARY_PLUS_S64):
1184                 {
1185                         next_pc += sizeof(struct unary_op);
1186                         PO;
1187                 }
1188                 OP(BYTECODE_OP_UNARY_MINUS_S64):
1189                 {
1190                         estack_ax_v = -estack_ax_v;
1191                         estack_ax_t = REG_S64;
1192                         next_pc += sizeof(struct unary_op);
1193                         PO;
1194                 }
1195                 OP(BYTECODE_OP_UNARY_PLUS_DOUBLE):
1196                 OP(BYTECODE_OP_UNARY_MINUS_DOUBLE):
1197                 {
1198                         BUG_ON(1);
1199                         PO;
1200                 }
1201                 OP(BYTECODE_OP_UNARY_NOT_S64):
1202                 {
1203                         estack_ax_v = !estack_ax_v;
1204                         estack_ax_t = REG_S64;
1205                         next_pc += sizeof(struct unary_op);
1206                         PO;
1207                 }
1208                 OP(BYTECODE_OP_UNARY_NOT_DOUBLE):
1209                 {
1210                         BUG_ON(1);
1211                         PO;
1212                 }
1213
1214                 /* logical */
1215                 OP(BYTECODE_OP_AND):
1216                 {
1217                         struct logical_op *insn = (struct logical_op *) pc;
1218
1219                         /* If AX is 0, skip and evaluate to 0 */
1220                         if (unlikely(estack_ax_v == 0)) {
1221                                 dbg_printk("Jumping to bytecode offset %u\n",
1222                                         (unsigned int) insn->skip_offset);
1223                                 next_pc = start_pc + insn->skip_offset;
1224                         } else {
1225                                 /* Pop 1 when jump not taken */
1226                                 estack_pop(stack, top, ax, bx, ax_t, bx_t);
1227                                 next_pc += sizeof(struct logical_op);
1228                         }
1229                         PO;
1230                 }
1231                 OP(BYTECODE_OP_OR):
1232                 {
1233                         struct logical_op *insn = (struct logical_op *) pc;
1234
1235                         /* If AX is nonzero, skip and evaluate to 1 */
1236
1237                         if (unlikely(estack_ax_v != 0)) {
1238                                 estack_ax_v = 1;
1239                                 dbg_printk("Jumping to bytecode offset %u\n",
1240                                         (unsigned int) insn->skip_offset);
1241                                 next_pc = start_pc + insn->skip_offset;
1242                         } else {
1243                                 /* Pop 1 when jump not taken */
1244                                 estack_pop(stack, top, ax, bx, ax_t, bx_t);
1245                                 next_pc += sizeof(struct logical_op);
1246                         }
1247                         PO;
1248                 }
1249
1250
1251                 /* load field ref */
1252                 OP(BYTECODE_OP_LOAD_FIELD_REF_STRING):
1253                 {
1254                         struct load_op *insn = (struct load_op *) pc;
1255                         struct field_ref *ref = (struct field_ref *) insn->data;
1256
1257                         dbg_printk("load field ref offset %u type string\n",
1258                                 ref->offset);
1259                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1260                         estack_ax(stack, top)->u.s.str =
1261                                 *(const char * const *) &interpreter_stack_data[ref->offset];
1262                         if (unlikely(!estack_ax(stack, top)->u.s.str)) {
1263                                 dbg_printk("Bytecode warning: loading a NULL string.\n");
1264                                 ret = -EINVAL;
1265                                 goto end;
1266                         }
1267                         estack_ax(stack, top)->u.s.seq_len = LTTNG_SIZE_MAX;
1268                         estack_ax(stack, top)->u.s.literal_type =
1269                                 ESTACK_STRING_LITERAL_TYPE_NONE;
1270                         estack_ax(stack, top)->u.s.user = 0;
1271                         estack_ax(stack, top)->type = REG_STRING;
1272                         dbg_printk("ref load string %s\n", estack_ax(stack, top)->u.s.str);
1273                         next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
1274                         PO;
1275                 }
1276
1277                 OP(BYTECODE_OP_LOAD_FIELD_REF_SEQUENCE):
1278                 {
1279                         struct load_op *insn = (struct load_op *) pc;
1280                         struct field_ref *ref = (struct field_ref *) insn->data;
1281
1282                         dbg_printk("load field ref offset %u type sequence\n",
1283                                 ref->offset);
1284                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1285                         estack_ax(stack, top)->u.s.seq_len =
1286                                 *(unsigned long *) &interpreter_stack_data[ref->offset];
1287                         estack_ax(stack, top)->u.s.str =
1288                                 *(const char **) (&interpreter_stack_data[ref->offset
1289                                                                 + sizeof(unsigned long)]);
1290                         if (unlikely(!estack_ax(stack, top)->u.s.str)) {
1291                                 dbg_printk("Bytecode warning: loading a NULL sequence.\n");
1292                                 ret = -EINVAL;
1293                                 goto end;
1294                         }
1295                         estack_ax(stack, top)->u.s.literal_type =
1296                                 ESTACK_STRING_LITERAL_TYPE_NONE;
1297                         estack_ax(stack, top)->u.s.user = 0;
1298                         next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
1299                         PO;
1300                 }
1301
1302                 OP(BYTECODE_OP_LOAD_FIELD_REF_S64):
1303                 {
1304                         struct load_op *insn = (struct load_op *) pc;
1305                         struct field_ref *ref = (struct field_ref *) insn->data;
1306
1307                         dbg_printk("load field ref offset %u type s64\n",
1308                                 ref->offset);
1309                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1310                         estack_ax_v =
1311                                 ((struct literal_numeric *) &interpreter_stack_data[ref->offset])->v;
1312                         estack_ax_t = REG_S64;
1313                         dbg_printk("ref load s64 %lld\n",
1314                                 (long long) estack_ax_v);
1315                         next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
1316                         PO;
1317                 }
1318
1319                 OP(BYTECODE_OP_LOAD_FIELD_REF_DOUBLE):
1320                 {
1321                         BUG_ON(1);
1322                         PO;
1323                 }
1324
1325                 /* load from immediate operand */
1326                 OP(BYTECODE_OP_LOAD_STRING):
1327                 {
1328                         struct load_op *insn = (struct load_op *) pc;
1329
1330                         dbg_printk("load string %s\n", insn->data);
1331                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1332                         estack_ax(stack, top)->u.s.str = insn->data;
1333                         estack_ax(stack, top)->u.s.seq_len = LTTNG_SIZE_MAX;
1334                         estack_ax(stack, top)->u.s.literal_type =
1335                                 ESTACK_STRING_LITERAL_TYPE_PLAIN;
1336                         estack_ax(stack, top)->u.s.user = 0;
1337                         next_pc += sizeof(struct load_op) + strlen(insn->data) + 1;
1338                         PO;
1339                 }
1340
1341                 OP(BYTECODE_OP_LOAD_STAR_GLOB_STRING):
1342                 {
1343                         struct load_op *insn = (struct load_op *) pc;
1344
1345                         dbg_printk("load globbing pattern %s\n", insn->data);
1346                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1347                         estack_ax(stack, top)->u.s.str = insn->data;
1348                         estack_ax(stack, top)->u.s.seq_len = LTTNG_SIZE_MAX;
1349                         estack_ax(stack, top)->u.s.literal_type =
1350                                 ESTACK_STRING_LITERAL_TYPE_STAR_GLOB;
1351                         estack_ax(stack, top)->u.s.user = 0;
1352                         next_pc += sizeof(struct load_op) + strlen(insn->data) + 1;
1353                         PO;
1354                 }
1355
1356                 OP(BYTECODE_OP_LOAD_S64):
1357                 {
1358                         struct load_op *insn = (struct load_op *) pc;
1359
1360                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1361                         estack_ax_v = ((struct literal_numeric *) insn->data)->v;
1362                         estack_ax_t = REG_S64;
1363                         dbg_printk("load s64 %lld\n",
1364                                 (long long) estack_ax_v);
1365                         next_pc += sizeof(struct load_op)
1366                                         + sizeof(struct literal_numeric);
1367                         PO;
1368                 }
1369
1370                 OP(BYTECODE_OP_LOAD_DOUBLE):
1371                 {
1372                         BUG_ON(1);
1373                         PO;
1374                 }
1375
1376                 /* cast */
1377                 OP(BYTECODE_OP_CAST_TO_S64):
1378                         printk(KERN_WARNING "LTTng: bytecode: unsupported non-specialized bytecode op %u\n",
1379                                 (unsigned int) *(bytecode_opcode_t *) pc);
1380                         ret = -EINVAL;
1381                         goto end;
1382
1383                 OP(BYTECODE_OP_CAST_DOUBLE_TO_S64):
1384                 {
1385                         BUG_ON(1);
1386                         PO;
1387                 }
1388
1389                 OP(BYTECODE_OP_CAST_NOP):
1390                 {
1391                         next_pc += sizeof(struct cast_op);
1392                         PO;
1393                 }
1394
1395                 /* get context ref */
1396                 OP(BYTECODE_OP_GET_CONTEXT_REF_STRING):
1397                 {
1398                         struct load_op *insn = (struct load_op *) pc;
1399                         struct field_ref *ref = (struct field_ref *) insn->data;
1400                         struct lttng_ctx_field *ctx_field;
1401                         union lttng_ctx_value v;
1402
1403                         dbg_printk("get context ref offset %u type string\n",
1404                                 ref->offset);
1405                         ctx_field = &lttng_static_ctx->fields[ref->offset];
1406                         ctx_field->get_value(ctx_field, lttng_probe_ctx, &v);
1407                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1408                         estack_ax(stack, top)->u.s.str = v.str;
1409                         if (unlikely(!estack_ax(stack, top)->u.s.str)) {
1410                                 dbg_printk("Bytecode warning: loading a NULL string.\n");
1411                                 ret = -EINVAL;
1412                                 goto end;
1413                         }
1414                         estack_ax(stack, top)->u.s.seq_len = LTTNG_SIZE_MAX;
1415                         estack_ax(stack, top)->u.s.literal_type =
1416                                 ESTACK_STRING_LITERAL_TYPE_NONE;
1417                         estack_ax(stack, top)->u.s.user = 0;
1418                         estack_ax(stack, top)->type = REG_STRING;
1419                         dbg_printk("ref get context string %s\n", estack_ax(stack, top)->u.s.str);
1420                         next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
1421                         PO;
1422                 }
1423
1424                 OP(BYTECODE_OP_GET_CONTEXT_REF_S64):
1425                 {
1426                         struct load_op *insn = (struct load_op *) pc;
1427                         struct field_ref *ref = (struct field_ref *) insn->data;
1428                         struct lttng_ctx_field *ctx_field;
1429                         union lttng_ctx_value v;
1430
1431                         dbg_printk("get context ref offset %u type s64\n",
1432                                 ref->offset);
1433                         ctx_field = &lttng_static_ctx->fields[ref->offset];
1434                         ctx_field->get_value(ctx_field, lttng_probe_ctx, &v);
1435                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1436                         estack_ax_v = v.s64;
1437                         estack_ax_t = REG_S64;
1438                         dbg_printk("ref get context s64 %lld\n",
1439                                 (long long) estack_ax_v);
1440                         next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
1441                         PO;
1442                 }
1443
1444                 OP(BYTECODE_OP_GET_CONTEXT_REF_DOUBLE):
1445                 {
1446                         BUG_ON(1);
1447                         PO;
1448                 }
1449
1450                 /* load userspace field ref */
1451                 OP(BYTECODE_OP_LOAD_FIELD_REF_USER_STRING):
1452                 {
1453                         struct load_op *insn = (struct load_op *) pc;
1454                         struct field_ref *ref = (struct field_ref *) insn->data;
1455
1456                         dbg_printk("load field ref offset %u type user string\n",
1457                                 ref->offset);
1458                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1459                         estack_ax(stack, top)->u.s.user_str =
1460                                 *(const char * const *) &interpreter_stack_data[ref->offset];
1461                         if (unlikely(!estack_ax(stack, top)->u.s.str)) {
1462                                 dbg_printk("Bytecode warning: loading a NULL string.\n");
1463                                 ret = -EINVAL;
1464                                 goto end;
1465                         }
1466                         estack_ax(stack, top)->u.s.seq_len = LTTNG_SIZE_MAX;
1467                         estack_ax(stack, top)->u.s.literal_type =
1468                                 ESTACK_STRING_LITERAL_TYPE_NONE;
1469                         estack_ax(stack, top)->u.s.user = 1;
1470                         estack_ax(stack, top)->type = REG_STRING;
1471                         dbg_printk("ref load string %s\n", estack_ax(stack, top)->u.s.str);
1472                         next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
1473                         PO;
1474                 }
1475
1476                 OP(BYTECODE_OP_LOAD_FIELD_REF_USER_SEQUENCE):
1477                 {
1478                         struct load_op *insn = (struct load_op *) pc;
1479                         struct field_ref *ref = (struct field_ref *) insn->data;
1480
1481                         dbg_printk("load field ref offset %u type user sequence\n",
1482                                 ref->offset);
1483                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1484                         estack_ax(stack, top)->u.s.seq_len =
1485                                 *(unsigned long *) &interpreter_stack_data[ref->offset];
1486                         estack_ax(stack, top)->u.s.user_str =
1487                                 *(const char **) (&interpreter_stack_data[ref->offset
1488                                                                 + sizeof(unsigned long)]);
1489                         if (unlikely(!estack_ax(stack, top)->u.s.str)) {
1490                                 dbg_printk("Bytecode warning: loading a NULL sequence.\n");
1491                                 ret = -EINVAL;
1492                                 goto end;
1493                         }
1494                         estack_ax(stack, top)->u.s.literal_type =
1495                                 ESTACK_STRING_LITERAL_TYPE_NONE;
1496                         estack_ax(stack, top)->u.s.user = 1;
1497                         next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
1498                         PO;
1499                 }
1500
1501                 OP(BYTECODE_OP_GET_CONTEXT_ROOT):
1502                 {
1503                         dbg_printk("op get context root\n");
1504                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1505                         estack_ax(stack, top)->u.ptr.type = LOAD_ROOT_CONTEXT;
1506                         /* "field" only needed for variants. */
1507                         estack_ax(stack, top)->u.ptr.field = NULL;
1508                         estack_ax(stack, top)->type = REG_PTR;
1509                         next_pc += sizeof(struct load_op);
1510                         PO;
1511                 }
1512
1513                 OP(BYTECODE_OP_GET_APP_CONTEXT_ROOT):
1514                 {
1515                         BUG_ON(1);
1516                         PO;
1517                 }
1518
1519                 OP(BYTECODE_OP_GET_PAYLOAD_ROOT):
1520                 {
1521                         dbg_printk("op get app payload root\n");
1522                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1523                         estack_ax(stack, top)->u.ptr.type = LOAD_ROOT_PAYLOAD;
1524                         estack_ax(stack, top)->u.ptr.ptr = interpreter_stack_data;
1525                         /* "field" only needed for variants. */
1526                         estack_ax(stack, top)->u.ptr.field = NULL;
1527                         estack_ax(stack, top)->type = REG_PTR;
1528                         next_pc += sizeof(struct load_op);
1529                         PO;
1530                 }
1531
1532                 OP(BYTECODE_OP_GET_SYMBOL):
1533                 {
1534                         dbg_printk("op get symbol\n");
1535                         switch (estack_ax(stack, top)->u.ptr.type) {
1536                         case LOAD_OBJECT:
1537                                 printk(KERN_WARNING "LTTng: bytecode: Nested fields not implemented yet.\n");
1538                                 ret = -EINVAL;
1539                                 goto end;
1540                         case LOAD_ROOT_CONTEXT:
1541                         case LOAD_ROOT_APP_CONTEXT:
1542                         case LOAD_ROOT_PAYLOAD:
1543                                 /*
1544                                  * symbol lookup is performed by
1545                                  * specialization.
1546                                  */
1547                                 ret = -EINVAL;
1548                                 goto end;
1549                         }
1550                         next_pc += sizeof(struct load_op) + sizeof(struct get_symbol);
1551                         PO;
1552                 }
1553
1554                 OP(BYTECODE_OP_GET_SYMBOL_FIELD):
1555                 {
1556                         /*
1557                          * Used for first variant encountered in a
1558                          * traversal. Variants are not implemented yet.
1559                          */
1560                         ret = -EINVAL;
1561                         goto end;
1562                 }
1563
1564                 OP(BYTECODE_OP_GET_INDEX_U16):
1565                 {
1566                         struct load_op *insn = (struct load_op *) pc;
1567                         struct get_index_u16 *index = (struct get_index_u16 *) insn->data;
1568
1569                         dbg_printk("op get index u16\n");
1570                         ret = dynamic_get_index(lttng_probe_ctx, bytecode, index->index, estack_ax(stack, top));
1571                         if (ret)
1572                                 goto end;
1573                         estack_ax_v = estack_ax(stack, top)->u.v;
1574                         estack_ax_t = estack_ax(stack, top)->type;
1575                         next_pc += sizeof(struct load_op) + sizeof(struct get_index_u16);
1576                         PO;
1577                 }
1578
1579                 OP(BYTECODE_OP_GET_INDEX_U64):
1580                 {
1581                         struct load_op *insn = (struct load_op *) pc;
1582                         struct get_index_u64 *index = (struct get_index_u64 *) insn->data;
1583
1584                         dbg_printk("op get index u64\n");
1585                         ret = dynamic_get_index(lttng_probe_ctx, bytecode, index->index, estack_ax(stack, top));
1586                         if (ret)
1587                                 goto end;
1588                         estack_ax_v = estack_ax(stack, top)->u.v;
1589                         estack_ax_t = estack_ax(stack, top)->type;
1590                         next_pc += sizeof(struct load_op) + sizeof(struct get_index_u64);
1591                         PO;
1592                 }
1593
1594                 OP(BYTECODE_OP_LOAD_FIELD):
1595                 {
1596                         dbg_printk("op load field\n");
1597                         ret = dynamic_load_field(estack_ax(stack, top));
1598                         if (ret)
1599                                 goto end;
1600                         estack_ax_v = estack_ax(stack, top)->u.v;
1601                         estack_ax_t = estack_ax(stack, top)->type;
1602                         next_pc += sizeof(struct load_op);
1603                         PO;
1604                 }
1605
1606                 OP(BYTECODE_OP_LOAD_FIELD_S8):
1607                 {
1608                         dbg_printk("op load field s8\n");
1609
1610                         estack_ax_v = *(int8_t *) estack_ax(stack, top)->u.ptr.ptr;
1611                         estack_ax_t = REG_S64;
1612                         next_pc += sizeof(struct load_op);
1613                         PO;
1614                 }
1615                 OP(BYTECODE_OP_LOAD_FIELD_S16):
1616                 {
1617                         dbg_printk("op load field s16\n");
1618
1619                         estack_ax_v = *(int16_t *) estack_ax(stack, top)->u.ptr.ptr;
1620                         estack_ax_t = REG_S64;
1621                         next_pc += sizeof(struct load_op);
1622                         PO;
1623                 }
1624                 OP(BYTECODE_OP_LOAD_FIELD_S32):
1625                 {
1626                         dbg_printk("op load field s32\n");
1627
1628                         estack_ax_v = *(int32_t *) estack_ax(stack, top)->u.ptr.ptr;
1629                         estack_ax_t = REG_S64;
1630                         next_pc += sizeof(struct load_op);
1631                         PO;
1632                 }
1633                 OP(BYTECODE_OP_LOAD_FIELD_S64):
1634                 {
1635                         dbg_printk("op load field s64\n");
1636
1637                         estack_ax_v = *(int64_t *) estack_ax(stack, top)->u.ptr.ptr;
1638                         estack_ax_t = REG_S64;
1639                         next_pc += sizeof(struct load_op);
1640                         PO;
1641                 }
1642                 OP(BYTECODE_OP_LOAD_FIELD_U8):
1643                 {
1644                         dbg_printk("op load field u8\n");
1645
1646                         estack_ax_v = *(uint8_t *) estack_ax(stack, top)->u.ptr.ptr;
1647                         estack_ax_t = REG_S64;
1648                         next_pc += sizeof(struct load_op);
1649                         PO;
1650                 }
1651                 OP(BYTECODE_OP_LOAD_FIELD_U16):
1652                 {
1653                         dbg_printk("op load field u16\n");
1654
1655                         estack_ax_v = *(uint16_t *) estack_ax(stack, top)->u.ptr.ptr;
1656                         estack_ax_t = REG_S64;
1657                         next_pc += sizeof(struct load_op);
1658                         PO;
1659                 }
1660                 OP(BYTECODE_OP_LOAD_FIELD_U32):
1661                 {
1662                         dbg_printk("op load field u32\n");
1663
1664                         estack_ax_v = *(uint32_t *) estack_ax(stack, top)->u.ptr.ptr;
1665                         estack_ax_t = REG_S64;
1666                         next_pc += sizeof(struct load_op);
1667                         PO;
1668                 }
1669                 OP(BYTECODE_OP_LOAD_FIELD_U64):
1670                 {
1671                         dbg_printk("op load field u64\n");
1672
1673                         estack_ax_v = *(uint64_t *) estack_ax(stack, top)->u.ptr.ptr;
1674                         estack_ax_t = REG_S64;
1675                         next_pc += sizeof(struct load_op);
1676                         PO;
1677                 }
1678                 OP(BYTECODE_OP_LOAD_FIELD_DOUBLE):
1679                 {
1680                         ret = -EINVAL;
1681                         goto end;
1682                 }
1683
1684                 OP(BYTECODE_OP_LOAD_FIELD_STRING):
1685                 {
1686                         const char *str;
1687
1688                         dbg_printk("op load field string\n");
1689                         str = (const char *) estack_ax(stack, top)->u.ptr.ptr;
1690                         estack_ax(stack, top)->u.s.str = str;
1691                         if (unlikely(!estack_ax(stack, top)->u.s.str)) {
1692                                 dbg_printk("Bytecode warning: loading a NULL string.\n");
1693                                 ret = -EINVAL;
1694                                 goto end;
1695                         }
1696                         estack_ax(stack, top)->u.s.seq_len = LTTNG_SIZE_MAX;
1697                         estack_ax(stack, top)->u.s.literal_type =
1698                                 ESTACK_STRING_LITERAL_TYPE_NONE;
1699                         estack_ax(stack, top)->type = REG_STRING;
1700                         next_pc += sizeof(struct load_op);
1701                         PO;
1702                 }
1703
1704                 OP(BYTECODE_OP_LOAD_FIELD_SEQUENCE):
1705                 {
1706                         const char *ptr;
1707
1708                         dbg_printk("op load field string sequence\n");
1709                         ptr = estack_ax(stack, top)->u.ptr.ptr;
1710                         estack_ax(stack, top)->u.s.seq_len = *(unsigned long *) ptr;
1711                         estack_ax(stack, top)->u.s.str = *(const char **) (ptr + sizeof(unsigned long));
1712                         if (unlikely(!estack_ax(stack, top)->u.s.str)) {
1713                                 dbg_printk("Bytecode warning: loading a NULL sequence.\n");
1714                                 ret = -EINVAL;
1715                                 goto end;
1716                         }
1717                         estack_ax(stack, top)->u.s.literal_type =
1718                                 ESTACK_STRING_LITERAL_TYPE_NONE;
1719                         estack_ax(stack, top)->type = REG_STRING;
1720                         next_pc += sizeof(struct load_op);
1721                         PO;
1722                 }
1723
1724         END_OP
1725 end:
1726         /* Return _DISCARD on error. */
1727         if (ret)
1728                 return LTTNG_INTERPRETER_DISCARD;
1729
1730         if (output) {
1731                 return lttng_bytecode_interpret_format_output(
1732                                 estack_ax(stack, top), output);
1733         }
1734
1735         return retval;
1736 }
1737 LTTNG_STACK_FRAME_NON_STANDARD(bytecode_interpret);
1738
1739 uint64_t lttng_bytecode_filter_interpret(void *filter_data,
1740                 struct lttng_probe_ctx *lttng_probe_ctx,
1741                 const char *filter_stack_data)
1742 {
1743         return bytecode_interpret(filter_data, lttng_probe_ctx,
1744                         filter_stack_data, NULL);
1745 }
1746
1747 #undef START_OP
1748 #undef OP
1749 #undef PO
1750 #undef END_OP