src/lttng-filter-interpreter.c

   1 /* SPDX-License-Identifier: MIT
   2  *
   3  * lttng-filter-interpreter.c
   4  *
   5  * LTTng modules filter 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/filter.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_filter_interpret_bytecode_false(void *filter_data,
 211                 struct lttng_probe_ctx *lttng_probe_ctx,
 212                 const char *filter_stack_data)
 213 {
 214         return LTTNG_FILTER_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_filter_print_op((unsigned int) *(filter_opcode_t *) pc), \
 229                         (unsigned int) *(filter_opcode_t *) pc);        \
 230                 switch (*(filter_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[*(filter_opcode_t *) pc];
 251
 252 #define OP(name)                                                        \
 253 LABEL_##name
 254
 255 #define PO                                                              \
 256                 pc = next_pc;                                           \
 257                 goto *dispatch[*(filter_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: filter: 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: filter: 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: filter: 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: filter: 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: filter: Structure type cannot be loaded.\n");
 344                 return -EINVAL;
 345         case atype_variant_nestable:
 346                 printk(KERN_WARNING "LTTng: filter: Variant type cannot be loaded.\n");
 347                 return -EINVAL;
 348         default:
 349                 printk(KERN_WARNING "LTTng: filter: 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 filter_get_index_data *gid;
 361
 362         gid = (const struct filter_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: filter: 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: filter: 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                 break;
 431         }
 432         return 0;
 433
 434 end:
 435         return ret;
 436 }
 437
 438 static int dynamic_load_field(struct estack_entry *stack_top)
 439 {
 440         int ret;
 441
 442         switch (stack_top->u.ptr.type) {
 443         case LOAD_OBJECT:
 444                 break;
 445         case LOAD_ROOT_CONTEXT:
 446         case LOAD_ROOT_APP_CONTEXT:
 447         case LOAD_ROOT_PAYLOAD:
 448         default:
 449                 dbg_printk("Filter warning: cannot load root, missing field name.\n");
 450                 ret = -EINVAL;
 451                 goto end;
 452         }
 453         switch (stack_top->u.ptr.object_type) {
 454         case OBJECT_TYPE_S8:
 455                 dbg_printk("op load field s8\n");
 456                 stack_top->u.v = *(int8_t *) stack_top->u.ptr.ptr;
 457                 stack_top->type = REG_S64;
 458                 break;
 459         case OBJECT_TYPE_S16:
 460         {
 461                 int16_t tmp;
 462
 463                 dbg_printk("op load field s16\n");
 464                 tmp = *(int16_t *) stack_top->u.ptr.ptr;
 465                 if (stack_top->u.ptr.rev_bo)
 466                         __swab16s(&tmp);
 467                 stack_top->u.v = tmp;
 468                 stack_top->type = REG_S64;
 469                 break;
 470         }
 471         case OBJECT_TYPE_S32:
 472         {
 473                 int32_t tmp;
 474
 475                 dbg_printk("op load field s32\n");
 476                 tmp = *(int32_t *) stack_top->u.ptr.ptr;
 477                 if (stack_top->u.ptr.rev_bo)
 478                         __swab32s(&tmp);
 479                 stack_top->u.v = tmp;
 480                 stack_top->type = REG_S64;
 481                 break;
 482         }
 483         case OBJECT_TYPE_S64:
 484         {
 485                 int64_t tmp;
 486
 487                 dbg_printk("op load field s64\n");
 488                 tmp = *(int64_t *) stack_top->u.ptr.ptr;
 489                 if (stack_top->u.ptr.rev_bo)
 490                         __swab64s(&tmp);
 491                 stack_top->u.v = tmp;
 492                 stack_top->type = REG_S64;
 493                 break;
 494         }
 495         case OBJECT_TYPE_U8:
 496                 dbg_printk("op load field u8\n");
 497                 stack_top->u.v = *(uint8_t *) stack_top->u.ptr.ptr;
 498                 stack_top->type = REG_U64;
 499                 break;
 500         case OBJECT_TYPE_U16:
 501         {
 502                 uint16_t tmp;
 503
 504                 dbg_printk("op load field u16\n");
 505                 tmp = *(uint16_t *) stack_top->u.ptr.ptr;
 506                 if (stack_top->u.ptr.rev_bo)
 507                         __swab16s(&tmp);
 508                 stack_top->u.v = tmp;
 509                 stack_top->type = REG_U64;
 510                 break;
 511         }
 512         case OBJECT_TYPE_U32:
 513         {
 514                 uint32_t tmp;
 515
 516                 dbg_printk("op load field u32\n");
 517                 tmp = *(uint32_t *) stack_top->u.ptr.ptr;
 518                 if (stack_top->u.ptr.rev_bo)
 519                         __swab32s(&tmp);
 520                 stack_top->u.v = tmp;
 521                 stack_top->type = REG_U64;
 522                 break;
 523         }
 524         case OBJECT_TYPE_U64:
 525         {
 526                 uint64_t tmp;
 527
 528                 dbg_printk("op load field u64\n");
 529                 tmp = *(uint64_t *) stack_top->u.ptr.ptr;
 530                 if (stack_top->u.ptr.rev_bo)
 531                         __swab64s(&tmp);
 532                 stack_top->u.v = tmp;
 533                 stack_top->type = REG_U64;
 534                 break;
 535         }
 536         case OBJECT_TYPE_STRING:
 537         {
 538                 const char *str;
 539
 540                 dbg_printk("op load field string\n");
 541                 str = (const char *) stack_top->u.ptr.ptr;
 542                 stack_top->u.s.str = str;
 543                 if (unlikely(!stack_top->u.s.str)) {
 544                         dbg_printk("Filter warning: loading a NULL string.\n");
 545                         ret = -EINVAL;
 546                         goto end;
 547                 }
 548                 stack_top->u.s.seq_len = LTTNG_SIZE_MAX;
 549                 stack_top->u.s.literal_type =
 550                         ESTACK_STRING_LITERAL_TYPE_NONE;
 551                 stack_top->type = REG_STRING;
 552                 break;
 553         }
 554         case OBJECT_TYPE_STRING_SEQUENCE:
 555         {
 556                 const char *ptr;
 557
 558                 dbg_printk("op load field string sequence\n");
 559                 ptr = stack_top->u.ptr.ptr;
 560                 stack_top->u.s.seq_len = *(unsigned long *) ptr;
 561                 stack_top->u.s.str = *(const char **) (ptr + sizeof(unsigned long));
 562                 if (unlikely(!stack_top->u.s.str)) {
 563                         dbg_printk("Filter warning: loading a NULL sequence.\n");
 564                         ret = -EINVAL;
 565                         goto end;
 566                 }
 567                 stack_top->u.s.literal_type =
 568                         ESTACK_STRING_LITERAL_TYPE_NONE;
 569                 stack_top->type = REG_STRING;
 570                 break;
 571         }
 572         case OBJECT_TYPE_DYNAMIC:
 573                 /*
 574                  * Dynamic types in context are looked up
 575                  * by context get index.
 576                  */
 577                 ret = -EINVAL;
 578                 goto end;
 579         case OBJECT_TYPE_DOUBLE:
 580                 ret = -EINVAL;
 581                 goto end;
 582         case OBJECT_TYPE_SEQUENCE:
 583         case OBJECT_TYPE_ARRAY:
 584         case OBJECT_TYPE_STRUCT:
 585         case OBJECT_TYPE_VARIANT:
 586                 printk(KERN_WARNING "LTTng: filter: Sequences, arrays, struct and variant cannot be loaded (nested types).\n");
 587                 ret = -EINVAL;
 588                 goto end;
 589         }
 590         return 0;
 591
 592 end:
 593         return ret;
 594 }
 595
 596 static
 597 int lttng_bytecode_interpret_format_output(struct estack_entry *ax,
 598                 struct lttng_interpreter_output *output)
 599 {
 600         int ret;
 601
 602 again:
 603         switch (ax->type) {
 604         case REG_S64:
 605                 output->type = LTTNG_INTERPRETER_TYPE_S64;
 606                 output->u.s = ax->u.v;
 607                 break;
 608         case REG_U64:
 609                 output->type = LTTNG_INTERPRETER_TYPE_U64;
 610                 output->u.u = (uint64_t) ax->u.v;
 611                 break;
 612         case REG_STRING:
 613                 output->type = LTTNG_INTERPRETER_TYPE_STRING;
 614                 output->u.str.str = ax->u.s.str;
 615                 output->u.str.len = ax->u.s.seq_len;
 616                 break;
 617         case REG_PTR:
 618                 switch (ax->u.ptr.object_type) {
 619                 case OBJECT_TYPE_S8:
 620                 case OBJECT_TYPE_S16:
 621                 case OBJECT_TYPE_S32:
 622                 case OBJECT_TYPE_S64:
 623                 case OBJECT_TYPE_U8:
 624                 case OBJECT_TYPE_U16:
 625                 case OBJECT_TYPE_U32:
 626                 case OBJECT_TYPE_U64:
 627                 case OBJECT_TYPE_DOUBLE:
 628                 case OBJECT_TYPE_STRING:
 629                 case OBJECT_TYPE_STRING_SEQUENCE:
 630                         ret = dynamic_load_field(ax);
 631                         if (ret)
 632                                 return ret;
 633                         /* Retry after loading ptr into stack top. */
 634                         goto again;
 635                 case OBJECT_TYPE_SEQUENCE:
 636                         output->type = LTTNG_INTERPRETER_TYPE_SEQUENCE;
 637                         output->u.sequence.ptr = *(const char **) (ax->u.ptr.ptr + sizeof(unsigned long));
 638                         output->u.sequence.nr_elem = *(unsigned long *) ax->u.ptr.ptr;
 639                         output->u.sequence.nested_type = ax->u.ptr.field->type.u.sequence_nestable.elem_type;
 640                         break;
 641                 case OBJECT_TYPE_ARRAY:
 642                         /* Skip count (unsigned long) */
 643                         output->type = LTTNG_INTERPRETER_TYPE_SEQUENCE;
 644                         output->u.sequence.ptr = *(const char **) (ax->u.ptr.ptr + sizeof(unsigned long));
 645                         output->u.sequence.nr_elem = ax->u.ptr.field->type.u.array_nestable.length;
 646                         output->u.sequence.nested_type = ax->u.ptr.field->type.u.array_nestable.elem_type;
 647                         break;
 648                 case OBJECT_TYPE_STRUCT:
 649                 case OBJECT_TYPE_VARIANT:
 650                 default:
 651                         return -EINVAL;
 652                 }
 653
 654                 break;
 655         case REG_STAR_GLOB_STRING:
 656         case REG_TYPE_UNKNOWN:
 657         default:
 658                 return -EINVAL;
 659         }
 660
 661         return LTTNG_FILTER_RECORD_FLAG;
 662 }
 663
 664 /*
 665  * Return 0 (discard), or raise the 0x1 flag (log event).
 666  * Currently, other flags are kept for future extensions and have no
 667  * effect.
 668  */
 669 static
 670 uint64_t bytecode_interpret(void *interpreter_data,
 671                 struct lttng_probe_ctx *lttng_probe_ctx,
 672                 const char *interpreter_stack_data,
 673                 struct lttng_interpreter_output *output)
 674 {
 675         struct bytecode_runtime *bytecode = interpreter_data;
 676         void *pc, *next_pc, *start_pc;
 677         int ret = -EINVAL;
 678         uint64_t retval = 0;
 679         struct estack _stack;
 680         struct estack *stack = &_stack;
 681         register int64_t ax = 0, bx = 0;
 682         register enum entry_type ax_t = REG_TYPE_UNKNOWN, bx_t = REG_TYPE_UNKNOWN;
 683         register int top = FILTER_STACK_EMPTY;
 684 #ifndef INTERPRETER_USE_SWITCH
 685         static void *dispatch[NR_FILTER_OPS] = {
 686                 [ FILTER_OP_UNKNOWN ] = &&LABEL_FILTER_OP_UNKNOWN,
 687
 688                 [ FILTER_OP_RETURN ] = &&LABEL_FILTER_OP_RETURN,
 689
 690                 /* binary */
 691                 [ FILTER_OP_MUL ] = &&LABEL_FILTER_OP_MUL,
 692                 [ FILTER_OP_DIV ] = &&LABEL_FILTER_OP_DIV,
 693                 [ FILTER_OP_MOD ] = &&LABEL_FILTER_OP_MOD,
 694                 [ FILTER_OP_PLUS ] = &&LABEL_FILTER_OP_PLUS,
 695                 [ FILTER_OP_MINUS ] = &&LABEL_FILTER_OP_MINUS,
 696                 [ FILTER_OP_BIT_RSHIFT ] = &&LABEL_FILTER_OP_BIT_RSHIFT,
 697                 [ FILTER_OP_BIT_LSHIFT ] = &&LABEL_FILTER_OP_BIT_LSHIFT,
 698                 [ FILTER_OP_BIT_AND ] = &&LABEL_FILTER_OP_BIT_AND,
 699                 [ FILTER_OP_BIT_OR ] = &&LABEL_FILTER_OP_BIT_OR,
 700                 [ FILTER_OP_BIT_XOR ] = &&LABEL_FILTER_OP_BIT_XOR,
 701
 702                 /* binary comparators */
 703                 [ FILTER_OP_EQ ] = &&LABEL_FILTER_OP_EQ,
 704                 [ FILTER_OP_NE ] = &&LABEL_FILTER_OP_NE,
 705                 [ FILTER_OP_GT ] = &&LABEL_FILTER_OP_GT,
 706                 [ FILTER_OP_LT ] = &&LABEL_FILTER_OP_LT,
 707                 [ FILTER_OP_GE ] = &&LABEL_FILTER_OP_GE,
 708                 [ FILTER_OP_LE ] = &&LABEL_FILTER_OP_LE,
 709
 710                 /* string binary comparator */
 711                 [ FILTER_OP_EQ_STRING ] = &&LABEL_FILTER_OP_EQ_STRING,
 712                 [ FILTER_OP_NE_STRING ] = &&LABEL_FILTER_OP_NE_STRING,
 713                 [ FILTER_OP_GT_STRING ] = &&LABEL_FILTER_OP_GT_STRING,
 714                 [ FILTER_OP_LT_STRING ] = &&LABEL_FILTER_OP_LT_STRING,
 715                 [ FILTER_OP_GE_STRING ] = &&LABEL_FILTER_OP_GE_STRING,
 716                 [ FILTER_OP_LE_STRING ] = &&LABEL_FILTER_OP_LE_STRING,
 717
 718                 /* globbing pattern binary comparator */
 719                 [ FILTER_OP_EQ_STAR_GLOB_STRING ] = &&LABEL_FILTER_OP_EQ_STAR_GLOB_STRING,
 720                 [ FILTER_OP_NE_STAR_GLOB_STRING ] = &&LABEL_FILTER_OP_NE_STAR_GLOB_STRING,
 721
 722                 /* s64 binary comparator */
 723                 [ FILTER_OP_EQ_S64 ] = &&LABEL_FILTER_OP_EQ_S64,
 724                 [ FILTER_OP_NE_S64 ] = &&LABEL_FILTER_OP_NE_S64,
 725                 [ FILTER_OP_GT_S64 ] = &&LABEL_FILTER_OP_GT_S64,
 726                 [ FILTER_OP_LT_S64 ] = &&LABEL_FILTER_OP_LT_S64,
 727                 [ FILTER_OP_GE_S64 ] = &&LABEL_FILTER_OP_GE_S64,
 728                 [ FILTER_OP_LE_S64 ] = &&LABEL_FILTER_OP_LE_S64,
 729
 730                 /* double binary comparator */
 731                 [ FILTER_OP_EQ_DOUBLE ] = &&LABEL_FILTER_OP_EQ_DOUBLE,
 732                 [ FILTER_OP_NE_DOUBLE ] = &&LABEL_FILTER_OP_NE_DOUBLE,
 733                 [ FILTER_OP_GT_DOUBLE ] = &&LABEL_FILTER_OP_GT_DOUBLE,
 734                 [ FILTER_OP_LT_DOUBLE ] = &&LABEL_FILTER_OP_LT_DOUBLE,
 735                 [ FILTER_OP_GE_DOUBLE ] = &&LABEL_FILTER_OP_GE_DOUBLE,
 736                 [ FILTER_OP_LE_DOUBLE ] = &&LABEL_FILTER_OP_LE_DOUBLE,
 737
 738                 /* Mixed S64-double binary comparators */
 739                 [ FILTER_OP_EQ_DOUBLE_S64 ] = &&LABEL_FILTER_OP_EQ_DOUBLE_S64,
 740                 [ FILTER_OP_NE_DOUBLE_S64 ] = &&LABEL_FILTER_OP_NE_DOUBLE_S64,
 741                 [ FILTER_OP_GT_DOUBLE_S64 ] = &&LABEL_FILTER_OP_GT_DOUBLE_S64,
 742                 [ FILTER_OP_LT_DOUBLE_S64 ] = &&LABEL_FILTER_OP_LT_DOUBLE_S64,
 743                 [ FILTER_OP_GE_DOUBLE_S64 ] = &&LABEL_FILTER_OP_GE_DOUBLE_S64,
 744                 [ FILTER_OP_LE_DOUBLE_S64 ] = &&LABEL_FILTER_OP_LE_DOUBLE_S64,
 745
 746                 [ FILTER_OP_EQ_S64_DOUBLE ] = &&LABEL_FILTER_OP_EQ_S64_DOUBLE,
 747                 [ FILTER_OP_NE_S64_DOUBLE ] = &&LABEL_FILTER_OP_NE_S64_DOUBLE,
 748                 [ FILTER_OP_GT_S64_DOUBLE ] = &&LABEL_FILTER_OP_GT_S64_DOUBLE,
 749                 [ FILTER_OP_LT_S64_DOUBLE ] = &&LABEL_FILTER_OP_LT_S64_DOUBLE,
 750                 [ FILTER_OP_GE_S64_DOUBLE ] = &&LABEL_FILTER_OP_GE_S64_DOUBLE,
 751                 [ FILTER_OP_LE_S64_DOUBLE ] = &&LABEL_FILTER_OP_LE_S64_DOUBLE,
 752
 753                 /* unary */
 754                 [ FILTER_OP_UNARY_PLUS ] = &&LABEL_FILTER_OP_UNARY_PLUS,
 755                 [ FILTER_OP_UNARY_MINUS ] = &&LABEL_FILTER_OP_UNARY_MINUS,
 756                 [ FILTER_OP_UNARY_NOT ] = &&LABEL_FILTER_OP_UNARY_NOT,
 757                 [ FILTER_OP_UNARY_PLUS_S64 ] = &&LABEL_FILTER_OP_UNARY_PLUS_S64,
 758                 [ FILTER_OP_UNARY_MINUS_S64 ] = &&LABEL_FILTER_OP_UNARY_MINUS_S64,
 759                 [ FILTER_OP_UNARY_NOT_S64 ] = &&LABEL_FILTER_OP_UNARY_NOT_S64,
 760                 [ FILTER_OP_UNARY_PLUS_DOUBLE ] = &&LABEL_FILTER_OP_UNARY_PLUS_DOUBLE,
 761                 [ FILTER_OP_UNARY_MINUS_DOUBLE ] = &&LABEL_FILTER_OP_UNARY_MINUS_DOUBLE,
 762                 [ FILTER_OP_UNARY_NOT_DOUBLE ] = &&LABEL_FILTER_OP_UNARY_NOT_DOUBLE,
 763
 764                 /* logical */
 765                 [ FILTER_OP_AND ] = &&LABEL_FILTER_OP_AND,
 766                 [ FILTER_OP_OR ] = &&LABEL_FILTER_OP_OR,
 767
 768                 /* load field ref */
 769                 [ FILTER_OP_LOAD_FIELD_REF ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF,
 770                 [ FILTER_OP_LOAD_FIELD_REF_STRING ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_STRING,
 771                 [ FILTER_OP_LOAD_FIELD_REF_SEQUENCE ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_SEQUENCE,
 772                 [ FILTER_OP_LOAD_FIELD_REF_S64 ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_S64,
 773                 [ FILTER_OP_LOAD_FIELD_REF_DOUBLE ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_DOUBLE,
 774
 775                 /* load from immediate operand */
 776                 [ FILTER_OP_LOAD_STRING ] = &&LABEL_FILTER_OP_LOAD_STRING,
 777                 [ FILTER_OP_LOAD_STAR_GLOB_STRING ] = &&LABEL_FILTER_OP_LOAD_STAR_GLOB_STRING,
 778                 [ FILTER_OP_LOAD_S64 ] = &&LABEL_FILTER_OP_LOAD_S64,
 779                 [ FILTER_OP_LOAD_DOUBLE ] = &&LABEL_FILTER_OP_LOAD_DOUBLE,
 780
 781                 /* cast */
 782                 [ FILTER_OP_CAST_TO_S64 ] = &&LABEL_FILTER_OP_CAST_TO_S64,
 783                 [ FILTER_OP_CAST_DOUBLE_TO_S64 ] = &&LABEL_FILTER_OP_CAST_DOUBLE_TO_S64,
 784                 [ FILTER_OP_CAST_NOP ] = &&LABEL_FILTER_OP_CAST_NOP,
 785
 786                 /* get context ref */
 787                 [ FILTER_OP_GET_CONTEXT_REF ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF,
 788                 [ FILTER_OP_GET_CONTEXT_REF_STRING ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF_STRING,
 789                 [ FILTER_OP_GET_CONTEXT_REF_S64 ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF_S64,
 790                 [ FILTER_OP_GET_CONTEXT_REF_DOUBLE ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF_DOUBLE,
 791
 792                 /* load userspace field ref */
 793                 [ FILTER_OP_LOAD_FIELD_REF_USER_STRING ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_USER_STRING,
 794                 [ FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE,
 795
 796                 /* Instructions for recursive traversal through composed types. */
 797                 [ FILTER_OP_GET_CONTEXT_ROOT ] = &&LABEL_FILTER_OP_GET_CONTEXT_ROOT,
 798                 [ FILTER_OP_GET_APP_CONTEXT_ROOT ] = &&LABEL_FILTER_OP_GET_APP_CONTEXT_ROOT,
 799                 [ FILTER_OP_GET_PAYLOAD_ROOT ] = &&LABEL_FILTER_OP_GET_PAYLOAD_ROOT,
 800
 801                 [ FILTER_OP_GET_SYMBOL ] = &&LABEL_FILTER_OP_GET_SYMBOL,
 802                 [ FILTER_OP_GET_SYMBOL_FIELD ] = &&LABEL_FILTER_OP_GET_SYMBOL_FIELD,
 803                 [ FILTER_OP_GET_INDEX_U16 ] = &&LABEL_FILTER_OP_GET_INDEX_U16,
 804                 [ FILTER_OP_GET_INDEX_U64 ] = &&LABEL_FILTER_OP_GET_INDEX_U64,
 805
 806                 [ FILTER_OP_LOAD_FIELD ] = &&LABEL_FILTER_OP_LOAD_FIELD,
 807                 [ FILTER_OP_LOAD_FIELD_S8        ] = &&LABEL_FILTER_OP_LOAD_FIELD_S8,
 808                 [ FILTER_OP_LOAD_FIELD_S16 ] = &&LABEL_FILTER_OP_LOAD_FIELD_S16,
 809                 [ FILTER_OP_LOAD_FIELD_S32 ] = &&LABEL_FILTER_OP_LOAD_FIELD_S32,
 810                 [ FILTER_OP_LOAD_FIELD_S64 ] = &&LABEL_FILTER_OP_LOAD_FIELD_S64,
 811                 [ FILTER_OP_LOAD_FIELD_U8 ] = &&LABEL_FILTER_OP_LOAD_FIELD_U8,
 812                 [ FILTER_OP_LOAD_FIELD_U16 ] = &&LABEL_FILTER_OP_LOAD_FIELD_U16,
 813                 [ FILTER_OP_LOAD_FIELD_U32 ] = &&LABEL_FILTER_OP_LOAD_FIELD_U32,
 814                 [ FILTER_OP_LOAD_FIELD_U64 ] = &&LABEL_FILTER_OP_LOAD_FIELD_U64,
 815                 [ FILTER_OP_LOAD_FIELD_STRING ] = &&LABEL_FILTER_OP_LOAD_FIELD_STRING,
 816                 [ FILTER_OP_LOAD_FIELD_SEQUENCE ] = &&LABEL_FILTER_OP_LOAD_FIELD_SEQUENCE,
 817                 [ FILTER_OP_LOAD_FIELD_DOUBLE ] = &&LABEL_FILTER_OP_LOAD_FIELD_DOUBLE,
 818
 819                 [ FILTER_OP_UNARY_BIT_NOT ] = &&LABEL_FILTER_OP_UNARY_BIT_NOT,
 820
 821                 [ FILTER_OP_RETURN_S64 ] = &&LABEL_FILTER_OP_RETURN_S64,
 822         };
 823 #endif /* #ifndef INTERPRETER_USE_SWITCH */
 824
 825         START_OP
 826
 827                 OP(FILTER_OP_UNKNOWN):
 828                 OP(FILTER_OP_LOAD_FIELD_REF):
 829                 OP(FILTER_OP_GET_CONTEXT_REF):
 830 #ifdef INTERPRETER_USE_SWITCH
 831                 default:
 832 #endif /* INTERPRETER_USE_SWITCH */
 833                         printk(KERN_WARNING "LTTng: filter: unknown bytecode op %u\n",
 834                                 (unsigned int) *(filter_opcode_t *) pc);
 835                         ret = -EINVAL;
 836                         goto end;
 837
 838                 OP(FILTER_OP_RETURN):
 839                 OP(FILTER_OP_RETURN_S64):
 840                         /* LTTNG_FILTER_DISCARD or LTTNG_FILTER_RECORD_FLAG */
 841                         switch (estack_ax_t) {
 842                         case REG_S64:
 843                         case REG_U64:
 844                                 retval = !!estack_ax_v;
 845                                 break;
 846                         case REG_DOUBLE:
 847                         case REG_STRING:
 848                         case REG_PTR:
 849                                 if (!output) {
 850                                         ret = -EINVAL;
 851                                         goto end;
 852                                 }
 853                                 retval = 0;
 854                                 break;
 855                         case REG_STAR_GLOB_STRING:
 856                         case REG_TYPE_UNKNOWN:
 857                                 ret = -EINVAL;
 858                                 goto end;
 859                         }
 860                         ret = 0;
 861                         goto end;
 862
 863                 /* binary */
 864                 OP(FILTER_OP_MUL):
 865                 OP(FILTER_OP_DIV):
 866                 OP(FILTER_OP_MOD):
 867                 OP(FILTER_OP_PLUS):
 868                 OP(FILTER_OP_MINUS):
 869                         printk(KERN_WARNING "LTTng: filter: unsupported bytecode op %u\n",
 870                                 (unsigned int) *(filter_opcode_t *) pc);
 871                         ret = -EINVAL;
 872                         goto end;
 873
 874                 OP(FILTER_OP_EQ):
 875                 OP(FILTER_OP_NE):
 876                 OP(FILTER_OP_GT):
 877                 OP(FILTER_OP_LT):
 878                 OP(FILTER_OP_GE):
 879                 OP(FILTER_OP_LE):
 880                         printk(KERN_WARNING "LTTng: filter: unsupported non-specialized bytecode op %u\n",
 881                                 (unsigned int) *(filter_opcode_t *) pc);
 882                         ret = -EINVAL;
 883                         goto end;
 884
 885                 OP(FILTER_OP_EQ_STRING):
 886                 {
 887                         int res;
 888
 889                         res = (stack_strcmp(stack, top, "==") == 0);
 890                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 891                         estack_ax_v = res;
 892                         estack_ax_t = REG_S64;
 893                         next_pc += sizeof(struct binary_op);
 894                         PO;
 895                 }
 896                 OP(FILTER_OP_NE_STRING):
 897                 {
 898                         int res;
 899
 900                         res = (stack_strcmp(stack, top, "!=") != 0);
 901                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 902                         estack_ax_v = res;
 903                         estack_ax_t = REG_S64;
 904                         next_pc += sizeof(struct binary_op);
 905                         PO;
 906                 }
 907                 OP(FILTER_OP_GT_STRING):
 908                 {
 909                         int res;
 910
 911                         res = (stack_strcmp(stack, top, ">") > 0);
 912                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 913                         estack_ax_v = res;
 914                         estack_ax_t = REG_S64;
 915                         next_pc += sizeof(struct binary_op);
 916                         PO;
 917                 }
 918                 OP(FILTER_OP_LT_STRING):
 919                 {
 920                         int res;
 921
 922                         res = (stack_strcmp(stack, top, "<") < 0);
 923                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 924                         estack_ax_v = res;
 925                         estack_ax_t = REG_S64;
 926                         next_pc += sizeof(struct binary_op);
 927                         PO;
 928                 }
 929                 OP(FILTER_OP_GE_STRING):
 930                 {
 931                         int res;
 932
 933                         res = (stack_strcmp(stack, top, ">=") >= 0);
 934                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 935                         estack_ax_v = res;
 936                         estack_ax_t = REG_S64;
 937                         next_pc += sizeof(struct binary_op);
 938                         PO;
 939                 }
 940                 OP(FILTER_OP_LE_STRING):
 941                 {
 942                         int res;
 943
 944                         res = (stack_strcmp(stack, top, "<=") <= 0);
 945                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 946                         estack_ax_v = res;
 947                         estack_ax_t = REG_S64;
 948                         next_pc += sizeof(struct binary_op);
 949                         PO;
 950                 }
 951
 952                 OP(FILTER_OP_EQ_STAR_GLOB_STRING):
 953                 {
 954                         int res;
 955
 956                         res = (stack_star_glob_match(stack, top, "==") == 0);
 957                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 958                         estack_ax_v = res;
 959                         estack_ax_t = REG_S64;
 960                         next_pc += sizeof(struct binary_op);
 961                         PO;
 962                 }
 963                 OP(FILTER_OP_NE_STAR_GLOB_STRING):
 964                 {
 965                         int res;
 966
 967                         res = (stack_star_glob_match(stack, top, "!=") != 0);
 968                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 969                         estack_ax_v = res;
 970                         estack_ax_t = REG_S64;
 971                         next_pc += sizeof(struct binary_op);
 972                         PO;
 973                 }
 974
 975                 OP(FILTER_OP_EQ_S64):
 976                 {
 977                         int res;
 978
 979                         res = (estack_bx_v == estack_ax_v);
 980                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 981                         estack_ax_v = res;
 982                         estack_ax_t = REG_S64;
 983                         next_pc += sizeof(struct binary_op);
 984                         PO;
 985                 }
 986                 OP(FILTER_OP_NE_S64):
 987                 {
 988                         int res;
 989
 990                         res = (estack_bx_v != estack_ax_v);
 991                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
 992                         estack_ax_v = res;
 993                         estack_ax_t = REG_S64;
 994                         next_pc += sizeof(struct binary_op);
 995                         PO;
 996                 }
 997                 OP(FILTER_OP_GT_S64):
 998                 {
 999                         int res;
1000
1001                         res = (estack_bx_v > estack_ax_v);
1002                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
1003                         estack_ax_v = res;
1004                         estack_ax_t = REG_S64;
1005                         next_pc += sizeof(struct binary_op);
1006                         PO;
1007                 }
1008                 OP(FILTER_OP_LT_S64):
1009                 {
1010                         int res;
1011
1012                         res = (estack_bx_v < estack_ax_v);
1013                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
1014                         estack_ax_v = res;
1015                         estack_ax_t = REG_S64;
1016                         next_pc += sizeof(struct binary_op);
1017                         PO;
1018                 }
1019                 OP(FILTER_OP_GE_S64):
1020                 {
1021                         int res;
1022
1023                         res = (estack_bx_v >= estack_ax_v);
1024                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
1025                         estack_ax_v = res;
1026                         estack_ax_t = REG_S64;
1027                         next_pc += sizeof(struct binary_op);
1028                         PO;
1029                 }
1030                 OP(FILTER_OP_LE_S64):
1031                 {
1032                         int res;
1033
1034                         res = (estack_bx_v <= estack_ax_v);
1035                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
1036                         estack_ax_v = res;
1037                         estack_ax_t = REG_S64;
1038                         next_pc += sizeof(struct binary_op);
1039                         PO;
1040                 }
1041
1042                 OP(FILTER_OP_EQ_DOUBLE):
1043                 OP(FILTER_OP_NE_DOUBLE):
1044                 OP(FILTER_OP_GT_DOUBLE):
1045                 OP(FILTER_OP_LT_DOUBLE):
1046                 OP(FILTER_OP_GE_DOUBLE):
1047                 OP(FILTER_OP_LE_DOUBLE):
1048                 {
1049                         BUG_ON(1);
1050                         PO;
1051                 }
1052
1053                 /* Mixed S64-double binary comparators */
1054                 OP(FILTER_OP_EQ_DOUBLE_S64):
1055                 OP(FILTER_OP_NE_DOUBLE_S64):
1056                 OP(FILTER_OP_GT_DOUBLE_S64):
1057                 OP(FILTER_OP_LT_DOUBLE_S64):
1058                 OP(FILTER_OP_GE_DOUBLE_S64):
1059                 OP(FILTER_OP_LE_DOUBLE_S64):
1060                 OP(FILTER_OP_EQ_S64_DOUBLE):
1061                 OP(FILTER_OP_NE_S64_DOUBLE):
1062                 OP(FILTER_OP_GT_S64_DOUBLE):
1063                 OP(FILTER_OP_LT_S64_DOUBLE):
1064                 OP(FILTER_OP_GE_S64_DOUBLE):
1065                 OP(FILTER_OP_LE_S64_DOUBLE):
1066                 {
1067                         BUG_ON(1);
1068                         PO;
1069                 }
1070                 OP(FILTER_OP_BIT_RSHIFT):
1071                 {
1072                         int64_t res;
1073
1074                         if (!IS_INTEGER_REGISTER(estack_ax_t) || !IS_INTEGER_REGISTER(estack_bx_t)) {
1075                                 ret = -EINVAL;
1076                                 goto end;
1077                         }
1078
1079                         /* Catch undefined behavior. */
1080                         if (unlikely(estack_ax_v < 0 || estack_ax_v >= 64)) {
1081                                 ret = -EINVAL;
1082                                 goto end;
1083                         }
1084                         res = ((uint64_t) estack_bx_v >> (uint32_t) estack_ax_v);
1085                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
1086                         estack_ax_v = res;
1087                         estack_ax_t = REG_U64;
1088                         next_pc += sizeof(struct binary_op);
1089                         PO;
1090                 }
1091                 OP(FILTER_OP_BIT_LSHIFT):
1092                 {
1093                         int64_t res;
1094
1095                         if (!IS_INTEGER_REGISTER(estack_ax_t) || !IS_INTEGER_REGISTER(estack_bx_t)) {
1096                                 ret = -EINVAL;
1097                                 goto end;
1098                         }
1099
1100                         /* Catch undefined behavior. */
1101                         if (unlikely(estack_ax_v < 0 || estack_ax_v >= 64)) {
1102                                 ret = -EINVAL;
1103                                 goto end;
1104                         }
1105                         res = ((uint64_t) estack_bx_v << (uint32_t) estack_ax_v);
1106                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
1107                         estack_ax_v = res;
1108                         estack_ax_t = REG_U64;
1109                         next_pc += sizeof(struct binary_op);
1110                         PO;
1111                 }
1112                 OP(FILTER_OP_BIT_AND):
1113                 {
1114                         int64_t res;
1115
1116                         if (!IS_INTEGER_REGISTER(estack_ax_t) || !IS_INTEGER_REGISTER(estack_bx_t)) {
1117                                 ret = -EINVAL;
1118                                 goto end;
1119                         }
1120
1121                         res = ((uint64_t) estack_bx_v & (uint64_t) estack_ax_v);
1122                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
1123                         estack_ax_v = res;
1124                         estack_ax_t = REG_U64;
1125                         next_pc += sizeof(struct binary_op);
1126                         PO;
1127                 }
1128                 OP(FILTER_OP_BIT_OR):
1129                 {
1130                         int64_t res;
1131
1132                         if (!IS_INTEGER_REGISTER(estack_ax_t) || !IS_INTEGER_REGISTER(estack_bx_t)) {
1133                                 ret = -EINVAL;
1134                                 goto end;
1135                         }
1136
1137                         res = ((uint64_t) estack_bx_v | (uint64_t) estack_ax_v);
1138                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
1139                         estack_ax_v = res;
1140                         estack_ax_t = REG_U64;
1141                         next_pc += sizeof(struct binary_op);
1142                         PO;
1143                 }
1144                 OP(FILTER_OP_BIT_XOR):
1145                 {
1146                         int64_t res;
1147
1148                         if (!IS_INTEGER_REGISTER(estack_ax_t) || !IS_INTEGER_REGISTER(estack_bx_t)) {
1149                                 ret = -EINVAL;
1150                                 goto end;
1151                         }
1152
1153                         res = ((uint64_t) estack_bx_v ^ (uint64_t) estack_ax_v);
1154                         estack_pop(stack, top, ax, bx, ax_t, bx_t);
1155                         estack_ax_v = res;
1156                         estack_ax_t = REG_U64;
1157                         next_pc += sizeof(struct binary_op);
1158                         PO;
1159                 }
1160
1161                 /* unary */
1162                 OP(FILTER_OP_UNARY_PLUS):
1163                 OP(FILTER_OP_UNARY_MINUS):
1164                 OP(FILTER_OP_UNARY_NOT):
1165                         printk(KERN_WARNING "LTTng: filter: unsupported non-specialized bytecode op %u\n",
1166                                 (unsigned int) *(filter_opcode_t *) pc);
1167                         ret = -EINVAL;
1168                         goto end;
1169
1170
1171                 OP(FILTER_OP_UNARY_BIT_NOT):
1172                 {
1173                         estack_ax_v = ~(uint64_t) estack_ax_v;
1174                         estack_ax_t = REG_S64;
1175                         next_pc += sizeof(struct unary_op);
1176                         PO;
1177                 }
1178
1179                 OP(FILTER_OP_UNARY_PLUS_S64):
1180                 {
1181                         next_pc += sizeof(struct unary_op);
1182                         PO;
1183                 }
1184                 OP(FILTER_OP_UNARY_MINUS_S64):
1185                 {
1186                         estack_ax_v = -estack_ax_v;
1187                         estack_ax_t = REG_S64;
1188                         next_pc += sizeof(struct unary_op);
1189                         PO;
1190                 }
1191                 OP(FILTER_OP_UNARY_PLUS_DOUBLE):
1192                 OP(FILTER_OP_UNARY_MINUS_DOUBLE):
1193                 {
1194                         BUG_ON(1);
1195                         PO;
1196                 }
1197                 OP(FILTER_OP_UNARY_NOT_S64):
1198                 {
1199                         estack_ax_v = !estack_ax_v;
1200                         estack_ax_t = REG_S64;
1201                         next_pc += sizeof(struct unary_op);
1202                         PO;
1203                 }
1204                 OP(FILTER_OP_UNARY_NOT_DOUBLE):
1205                 {
1206                         BUG_ON(1);
1207                         PO;
1208                 }
1209
1210                 /* logical */
1211                 OP(FILTER_OP_AND):
1212                 {
1213                         struct logical_op *insn = (struct logical_op *) pc;
1214
1215                         /* If AX is 0, skip and evaluate to 0 */
1216                         if (unlikely(estack_ax_v == 0)) {
1217                                 dbg_printk("Jumping to bytecode offset %u\n",
1218                                         (unsigned int) insn->skip_offset);
1219                                 next_pc = start_pc + insn->skip_offset;
1220                         } else {
1221                                 /* Pop 1 when jump not taken */
1222                                 estack_pop(stack, top, ax, bx, ax_t, bx_t);
1223                                 next_pc += sizeof(struct logical_op);
1224                         }
1225                         PO;
1226                 }
1227                 OP(FILTER_OP_OR):
1228                 {
1229                         struct logical_op *insn = (struct logical_op *) pc;
1230
1231                         /* If AX is nonzero, skip and evaluate to 1 */
1232
1233                         if (unlikely(estack_ax_v != 0)) {
1234                                 estack_ax_v = 1;
1235                                 dbg_printk("Jumping to bytecode offset %u\n",
1236                                         (unsigned int) insn->skip_offset);
1237                                 next_pc = start_pc + insn->skip_offset;
1238                         } else {
1239                                 /* Pop 1 when jump not taken */
1240                                 estack_pop(stack, top, ax, bx, ax_t, bx_t);
1241                                 next_pc += sizeof(struct logical_op);
1242                         }
1243                         PO;
1244                 }
1245
1246
1247                 /* load field ref */
1248                 OP(FILTER_OP_LOAD_FIELD_REF_STRING):
1249                 {
1250                         struct load_op *insn = (struct load_op *) pc;
1251                         struct field_ref *ref = (struct field_ref *) insn->data;
1252
1253                         dbg_printk("load field ref offset %u type string\n",
1254                                 ref->offset);
1255                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1256                         estack_ax(stack, top)->u.s.str =
1257                                 *(const char * const *) &interpreter_stack_data[ref->offset];
1258                         if (unlikely(!estack_ax(stack, top)->u.s.str)) {
1259                                 dbg_printk("Filter warning: loading a NULL string.\n");
1260                                 ret = -EINVAL;
1261                                 goto end;
1262                         }
1263                         estack_ax(stack, top)->u.s.seq_len = LTTNG_SIZE_MAX;
1264                         estack_ax(stack, top)->u.s.literal_type =
1265                                 ESTACK_STRING_LITERAL_TYPE_NONE;
1266                         estack_ax(stack, top)->u.s.user = 0;
1267                         estack_ax(stack, top)->type = REG_STRING;
1268                         dbg_printk("ref load string %s\n", estack_ax(stack, top)->u.s.str);
1269                         next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
1270                         PO;
1271                 }
1272
1273                 OP(FILTER_OP_LOAD_FIELD_REF_SEQUENCE):
1274                 {
1275                         struct load_op *insn = (struct load_op *) pc;
1276                         struct field_ref *ref = (struct field_ref *) insn->data;
1277
1278                         dbg_printk("load field ref offset %u type sequence\n",
1279                                 ref->offset);
1280                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1281                         estack_ax(stack, top)->u.s.seq_len =
1282                                 *(unsigned long *) &interpreter_stack_data[ref->offset];
1283                         estack_ax(stack, top)->u.s.str =
1284                                 *(const char **) (&interpreter_stack_data[ref->offset
1285                                                                 + sizeof(unsigned long)]);
1286                         if (unlikely(!estack_ax(stack, top)->u.s.str)) {
1287                                 dbg_printk("Filter warning: loading a NULL sequence.\n");
1288                                 ret = -EINVAL;
1289                                 goto end;
1290                         }
1291                         estack_ax(stack, top)->u.s.literal_type =
1292                                 ESTACK_STRING_LITERAL_TYPE_NONE;
1293                         estack_ax(stack, top)->u.s.user = 0;
1294                         next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
1295                         PO;
1296                 }
1297
1298                 OP(FILTER_OP_LOAD_FIELD_REF_S64):
1299                 {
1300                         struct load_op *insn = (struct load_op *) pc;
1301                         struct field_ref *ref = (struct field_ref *) insn->data;
1302
1303                         dbg_printk("load field ref offset %u type s64\n",
1304                                 ref->offset);
1305                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1306                         estack_ax_v =
1307                                 ((struct literal_numeric *) &interpreter_stack_data[ref->offset])->v;
1308                         estack_ax_t = REG_S64;
1309                         dbg_printk("ref load s64 %lld\n",
1310                                 (long long) estack_ax_v);
1311                         next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
1312                         PO;
1313                 }
1314
1315                 OP(FILTER_OP_LOAD_FIELD_REF_DOUBLE):
1316                 {
1317                         BUG_ON(1);
1318                         PO;
1319                 }
1320
1321                 /* load from immediate operand */
1322                 OP(FILTER_OP_LOAD_STRING):
1323                 {
1324                         struct load_op *insn = (struct load_op *) pc;
1325
1326                         dbg_printk("load string %s\n", insn->data);
1327                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1328                         estack_ax(stack, top)->u.s.str = insn->data;
1329                         estack_ax(stack, top)->u.s.seq_len = LTTNG_SIZE_MAX;
1330                         estack_ax(stack, top)->u.s.literal_type =
1331                                 ESTACK_STRING_LITERAL_TYPE_PLAIN;
1332                         estack_ax(stack, top)->u.s.user = 0;
1333                         next_pc += sizeof(struct load_op) + strlen(insn->data) + 1;
1334                         PO;
1335                 }
1336
1337                 OP(FILTER_OP_LOAD_STAR_GLOB_STRING):
1338                 {
1339                         struct load_op *insn = (struct load_op *) pc;
1340
1341                         dbg_printk("load globbing pattern %s\n", insn->data);
1342                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1343                         estack_ax(stack, top)->u.s.str = insn->data;
1344                         estack_ax(stack, top)->u.s.seq_len = LTTNG_SIZE_MAX;
1345                         estack_ax(stack, top)->u.s.literal_type =
1346                                 ESTACK_STRING_LITERAL_TYPE_STAR_GLOB;
1347                         estack_ax(stack, top)->u.s.user = 0;
1348                         next_pc += sizeof(struct load_op) + strlen(insn->data) + 1;
1349                         PO;
1350                 }
1351
1352                 OP(FILTER_OP_LOAD_S64):
1353                 {
1354                         struct load_op *insn = (struct load_op *) pc;
1355
1356                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1357                         estack_ax_v = ((struct literal_numeric *) insn->data)->v;
1358                         estack_ax_t = REG_S64;
1359                         dbg_printk("load s64 %lld\n",
1360                                 (long long) estack_ax_v);
1361                         next_pc += sizeof(struct load_op)
1362                                         + sizeof(struct literal_numeric);
1363                         PO;
1364                 }
1365
1366                 OP(FILTER_OP_LOAD_DOUBLE):
1367                 {
1368                         BUG_ON(1);
1369                         PO;
1370                 }
1371
1372                 /* cast */
1373                 OP(FILTER_OP_CAST_TO_S64):
1374                         printk(KERN_WARNING "LTTng: filter: unsupported non-specialized bytecode op %u\n",
1375                                 (unsigned int) *(filter_opcode_t *) pc);
1376                         ret = -EINVAL;
1377                         goto end;
1378
1379                 OP(FILTER_OP_CAST_DOUBLE_TO_S64):
1380                 {
1381                         BUG_ON(1);
1382                         PO;
1383                 }
1384
1385                 OP(FILTER_OP_CAST_NOP):
1386                 {
1387                         next_pc += sizeof(struct cast_op);
1388                         PO;
1389                 }
1390
1391                 /* get context ref */
1392                 OP(FILTER_OP_GET_CONTEXT_REF_STRING):
1393                 {
1394                         struct load_op *insn = (struct load_op *) pc;
1395                         struct field_ref *ref = (struct field_ref *) insn->data;
1396                         struct lttng_ctx_field *ctx_field;
1397                         union lttng_ctx_value v;
1398
1399                         dbg_printk("get context ref offset %u type string\n",
1400                                 ref->offset);
1401                         ctx_field = &lttng_static_ctx->fields[ref->offset];
1402                         ctx_field->get_value(ctx_field, lttng_probe_ctx, &v);
1403                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1404                         estack_ax(stack, top)->u.s.str = v.str;
1405                         if (unlikely(!estack_ax(stack, top)->u.s.str)) {
1406                                 dbg_printk("Filter warning: loading a NULL string.\n");
1407                                 ret = -EINVAL;
1408                                 goto end;
1409                         }
1410                         estack_ax(stack, top)->u.s.seq_len = LTTNG_SIZE_MAX;
1411                         estack_ax(stack, top)->u.s.literal_type =
1412                                 ESTACK_STRING_LITERAL_TYPE_NONE;
1413                         estack_ax(stack, top)->u.s.user = 0;
1414                         estack_ax(stack, top)->type = REG_STRING;
1415                         dbg_printk("ref get context string %s\n", estack_ax(stack, top)->u.s.str);
1416                         next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
1417                         PO;
1418                 }
1419
1420                 OP(FILTER_OP_GET_CONTEXT_REF_S64):
1421                 {
1422                         struct load_op *insn = (struct load_op *) pc;
1423                         struct field_ref *ref = (struct field_ref *) insn->data;
1424                         struct lttng_ctx_field *ctx_field;
1425                         union lttng_ctx_value v;
1426
1427                         dbg_printk("get context ref offset %u type s64\n",
1428                                 ref->offset);
1429                         ctx_field = &lttng_static_ctx->fields[ref->offset];
1430                         ctx_field->get_value(ctx_field, lttng_probe_ctx, &v);
1431                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1432                         estack_ax_v = v.s64;
1433                         estack_ax_t = REG_S64;
1434                         dbg_printk("ref get context s64 %lld\n",
1435                                 (long long) estack_ax_v);
1436                         next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
1437                         PO;
1438                 }
1439
1440                 OP(FILTER_OP_GET_CONTEXT_REF_DOUBLE):
1441                 {
1442                         BUG_ON(1);
1443                         PO;
1444                 }
1445
1446                 /* load userspace field ref */
1447                 OP(FILTER_OP_LOAD_FIELD_REF_USER_STRING):
1448                 {
1449                         struct load_op *insn = (struct load_op *) pc;
1450                         struct field_ref *ref = (struct field_ref *) insn->data;
1451
1452                         dbg_printk("load field ref offset %u type user string\n",
1453                                 ref->offset);
1454                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1455                         estack_ax(stack, top)->u.s.user_str =
1456                                 *(const char * const *) &interpreter_stack_data[ref->offset];
1457                         if (unlikely(!estack_ax(stack, top)->u.s.str)) {
1458                                 dbg_printk("Filter warning: loading a NULL string.\n");
1459                                 ret = -EINVAL;
1460                                 goto end;
1461                         }
1462                         estack_ax(stack, top)->u.s.seq_len = LTTNG_SIZE_MAX;
1463                         estack_ax(stack, top)->u.s.literal_type =
1464                                 ESTACK_STRING_LITERAL_TYPE_NONE;
1465                         estack_ax(stack, top)->u.s.user = 1;
1466                         estack_ax(stack, top)->type = REG_STRING;
1467                         dbg_printk("ref load string %s\n", estack_ax(stack, top)->u.s.str);
1468                         next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
1469                         PO;
1470                 }
1471
1472                 OP(FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE):
1473                 {
1474                         struct load_op *insn = (struct load_op *) pc;
1475                         struct field_ref *ref = (struct field_ref *) insn->data;
1476
1477                         dbg_printk("load field ref offset %u type user sequence\n",
1478                                 ref->offset);
1479                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1480                         estack_ax(stack, top)->u.s.seq_len =
1481                                 *(unsigned long *) &interpreter_stack_data[ref->offset];
1482                         estack_ax(stack, top)->u.s.user_str =
1483                                 *(const char **) (&interpreter_stack_data[ref->offset
1484                                                                 + sizeof(unsigned long)]);
1485                         if (unlikely(!estack_ax(stack, top)->u.s.str)) {
1486                                 dbg_printk("Filter warning: loading a NULL sequence.\n");
1487                                 ret = -EINVAL;
1488                                 goto end;
1489                         }
1490                         estack_ax(stack, top)->u.s.literal_type =
1491                                 ESTACK_STRING_LITERAL_TYPE_NONE;
1492                         estack_ax(stack, top)->u.s.user = 1;
1493                         next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
1494                         PO;
1495                 }
1496
1497                 OP(FILTER_OP_GET_CONTEXT_ROOT):
1498                 {
1499                         dbg_printk("op get context root\n");
1500                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1501                         estack_ax(stack, top)->u.ptr.type = LOAD_ROOT_CONTEXT;
1502                         /* "field" only needed for variants. */
1503                         estack_ax(stack, top)->u.ptr.field = NULL;
1504                         estack_ax(stack, top)->type = REG_PTR;
1505                         next_pc += sizeof(struct load_op);
1506                         PO;
1507                 }
1508
1509                 OP(FILTER_OP_GET_APP_CONTEXT_ROOT):
1510                 {
1511                         BUG_ON(1);
1512                         PO;
1513                 }
1514
1515                 OP(FILTER_OP_GET_PAYLOAD_ROOT):
1516                 {
1517                         dbg_printk("op get app payload root\n");
1518                         estack_push(stack, top, ax, bx, ax_t, bx_t);
1519                         estack_ax(stack, top)->u.ptr.type = LOAD_ROOT_PAYLOAD;
1520                         estack_ax(stack, top)->u.ptr.ptr = interpreter_stack_data;
1521                         /* "field" only needed for variants. */
1522                         estack_ax(stack, top)->u.ptr.field = NULL;
1523                         estack_ax(stack, top)->type = REG_PTR;
1524                         next_pc += sizeof(struct load_op);
1525                         PO;
1526                 }
1527
1528                 OP(FILTER_OP_GET_SYMBOL):
1529                 {
1530                         dbg_printk("op get symbol\n");
1531                         switch (estack_ax(stack, top)->u.ptr.type) {
1532                         case LOAD_OBJECT:
1533                                 printk(KERN_WARNING "LTTng: filter: Nested fields not implemented yet.\n");
1534                                 ret = -EINVAL;
1535                                 goto end;
1536                         case LOAD_ROOT_CONTEXT:
1537                         case LOAD_ROOT_APP_CONTEXT:
1538                         case LOAD_ROOT_PAYLOAD:
1539                                 /*
1540                                  * symbol lookup is performed by
1541                                  * specialization.
1542                                  */
1543                                 ret = -EINVAL;
1544                                 goto end;
1545                         }
1546                         next_pc += sizeof(struct load_op) + sizeof(struct get_symbol);
1547                         PO;
1548                 }
1549
1550                 OP(FILTER_OP_GET_SYMBOL_FIELD):
1551                 {
1552                         /*
1553                          * Used for first variant encountered in a
1554                          * traversal. Variants are not implemented yet.
1555                          */
1556                         ret = -EINVAL;
1557                         goto end;
1558                 }
1559
1560                 OP(FILTER_OP_GET_INDEX_U16):
1561                 {
1562                         struct load_op *insn = (struct load_op *) pc;
1563                         struct get_index_u16 *index = (struct get_index_u16 *) insn->data;
1564
1565                         dbg_printk("op get index u16\n");
1566                         ret = dynamic_get_index(lttng_probe_ctx, bytecode, index->index, estack_ax(stack, top));
1567                         if (ret)
1568                                 goto end;
1569                         estack_ax_v = estack_ax(stack, top)->u.v;
1570                         estack_ax_t = estack_ax(stack, top)->type;
1571                         next_pc += sizeof(struct load_op) + sizeof(struct get_index_u16);
1572                         PO;
1573                 }
1574
1575                 OP(FILTER_OP_GET_INDEX_U64):
1576                 {
1577                         struct load_op *insn = (struct load_op *) pc;
1578                         struct get_index_u64 *index = (struct get_index_u64 *) insn->data;
1579
1580                         dbg_printk("op get index u64\n");
1581                         ret = dynamic_get_index(lttng_probe_ctx, bytecode, index->index, estack_ax(stack, top));
1582                         if (ret)
1583                                 goto end;
1584                         estack_ax_v = estack_ax(stack, top)->u.v;
1585                         estack_ax_t = estack_ax(stack, top)->type;
1586                         next_pc += sizeof(struct load_op) + sizeof(struct get_index_u64);
1587                         PO;
1588                 }
1589
1590                 OP(FILTER_OP_LOAD_FIELD):
1591                 {
1592                         dbg_printk("op load field\n");
1593                         ret = dynamic_load_field(estack_ax(stack, top));
1594                         if (ret)
1595                                 goto end;
1596                         estack_ax_v = estack_ax(stack, top)->u.v;
1597                         estack_ax_t = estack_ax(stack, top)->type;
1598                         next_pc += sizeof(struct load_op);
1599                         PO;
1600                 }
1601
1602                 OP(FILTER_OP_LOAD_FIELD_S8):
1603                 {
1604                         dbg_printk("op load field s8\n");
1605
1606                         estack_ax_v = *(int8_t *) estack_ax(stack, top)->u.ptr.ptr;
1607                         estack_ax_t = REG_S64;
1608                         next_pc += sizeof(struct load_op);
1609                         PO;
1610                 }
1611                 OP(FILTER_OP_LOAD_FIELD_S16):
1612                 {
1613                         dbg_printk("op load field s16\n");
1614
1615                         estack_ax_v = *(int16_t *) estack_ax(stack, top)->u.ptr.ptr;
1616                         estack_ax_t = REG_S64;
1617                         next_pc += sizeof(struct load_op);
1618                         PO;
1619                 }
1620                 OP(FILTER_OP_LOAD_FIELD_S32):
1621                 {
1622                         dbg_printk("op load field s32\n");
1623
1624                         estack_ax_v = *(int32_t *) estack_ax(stack, top)->u.ptr.ptr;
1625                         estack_ax_t = REG_S64;
1626                         next_pc += sizeof(struct load_op);
1627                         PO;
1628                 }
1629                 OP(FILTER_OP_LOAD_FIELD_S64):
1630                 {
1631                         dbg_printk("op load field s64\n");
1632
1633                         estack_ax_v = *(int64_t *) estack_ax(stack, top)->u.ptr.ptr;
1634                         estack_ax_t = REG_S64;
1635                         next_pc += sizeof(struct load_op);
1636                         PO;
1637                 }
1638                 OP(FILTER_OP_LOAD_FIELD_U8):
1639                 {
1640                         dbg_printk("op load field u8\n");
1641
1642                         estack_ax_v = *(uint8_t *) estack_ax(stack, top)->u.ptr.ptr;
1643                         estack_ax_t = REG_S64;
1644                         next_pc += sizeof(struct load_op);
1645                         PO;
1646                 }
1647                 OP(FILTER_OP_LOAD_FIELD_U16):
1648                 {
1649                         dbg_printk("op load field u16\n");
1650
1651                         estack_ax_v = *(uint16_t *) estack_ax(stack, top)->u.ptr.ptr;
1652                         estack_ax_t = REG_S64;
1653                         next_pc += sizeof(struct load_op);
1654                         PO;
1655                 }
1656                 OP(FILTER_OP_LOAD_FIELD_U32):
1657                 {
1658                         dbg_printk("op load field u32\n");
1659
1660                         estack_ax_v = *(uint32_t *) estack_ax(stack, top)->u.ptr.ptr;
1661                         estack_ax_t = REG_S64;
1662                         next_pc += sizeof(struct load_op);
1663                         PO;
1664                 }
1665                 OP(FILTER_OP_LOAD_FIELD_U64):
1666                 {
1667                         dbg_printk("op load field u64\n");
1668
1669                         estack_ax_v = *(uint64_t *) estack_ax(stack, top)->u.ptr.ptr;
1670                         estack_ax_t = REG_S64;
1671                         next_pc += sizeof(struct load_op);
1672                         PO;
1673                 }
1674                 OP(FILTER_OP_LOAD_FIELD_DOUBLE):
1675                 {
1676                         ret = -EINVAL;
1677                         goto end;
1678                 }
1679
1680                 OP(FILTER_OP_LOAD_FIELD_STRING):
1681                 {
1682                         const char *str;
1683
1684                         dbg_printk("op load field string\n");
1685                         str = (const char *) estack_ax(stack, top)->u.ptr.ptr;
1686                         estack_ax(stack, top)->u.s.str = str;
1687                         if (unlikely(!estack_ax(stack, top)->u.s.str)) {
1688                                 dbg_printk("Filter warning: loading a NULL string.\n");
1689                                 ret = -EINVAL;
1690                                 goto end;
1691                         }
1692                         estack_ax(stack, top)->u.s.seq_len = LTTNG_SIZE_MAX;
1693                         estack_ax(stack, top)->u.s.literal_type =
1694                                 ESTACK_STRING_LITERAL_TYPE_NONE;
1695                         estack_ax(stack, top)->type = REG_STRING;
1696                         next_pc += sizeof(struct load_op);
1697                         PO;
1698                 }
1699
1700                 OP(FILTER_OP_LOAD_FIELD_SEQUENCE):
1701                 {
1702                         const char *ptr;
1703
1704                         dbg_printk("op load field string sequence\n");
1705                         ptr = estack_ax(stack, top)->u.ptr.ptr;
1706                         estack_ax(stack, top)->u.s.seq_len = *(unsigned long *) ptr;
1707                         estack_ax(stack, top)->u.s.str = *(const char **) (ptr + sizeof(unsigned long));
1708                         if (unlikely(!estack_ax(stack, top)->u.s.str)) {
1709                                 dbg_printk("Filter warning: loading a NULL sequence.\n");
1710                                 ret = -EINVAL;
1711                                 goto end;
1712                         }
1713                         estack_ax(stack, top)->u.s.literal_type =
1714                                 ESTACK_STRING_LITERAL_TYPE_NONE;
1715                         estack_ax(stack, top)->type = REG_STRING;
1716                         next_pc += sizeof(struct load_op);
1717                         PO;
1718                 }
1719
1720         END_OP
1721 end:
1722         /* Return _DISCARD on error. */
1723         if (ret)
1724                 return LTTNG_FILTER_DISCARD;
1725
1726         if (output) {
1727                 return lttng_bytecode_interpret_format_output(
1728                                 estack_ax(stack, top), output);
1729         }
1730
1731         return retval;
1732 }
1733 LTTNG_STACK_FRAME_NON_STANDARD(bytecode_interpret);
1734
1735 uint64_t lttng_filter_interpret_bytecode(void *filter_data,
1736                 struct lttng_probe_ctx *lttng_probe_ctx,
1737                 const char *filter_stack_data)
1738 {
1739         return bytecode_interpret(filter_data, lttng_probe_ctx,
1740                         filter_stack_data, NULL);
1741 }
1742
1743 #undef START_OP
1744 #undef OP
1745 #undef PO
1746 #undef END_OP