drivers/acpi/acpica/psloop.c

   1 /******************************************************************************
   2  *
   3  * Module Name: psloop - Main AML parse loop
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 /*
  45  * Parse the AML and build an operation tree as most interpreters, (such as
  46  * Perl) do. Parsing is done by hand rather than with a YACC generated parser
  47  * to tightly constrain stack and dynamic memory usage. Parsing is kept
  48  * flexible and the code fairly compact by parsing based on a list of AML
  49  * opcode templates in aml_op_info[].
  50  */
  51
  52 #include <acpi/acpi.h>
  53 #include "accommon.h"
  54 #include "acparser.h"
  55 #include "acdispat.h"
  56 #include "amlcode.h"
  57
  58 #define _COMPONENT          ACPI_PARSER
  59 ACPI_MODULE_NAME("psloop")
  60
  61 /* Local prototypes */
  62 static acpi_status
  63 acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
  64                       u8 * aml_op_start, union acpi_parse_object *op);
  65
  66 static void
  67 acpi_ps_link_module_code(union acpi_parse_object *parent_op,
  68                          u8 *aml_start, u32 aml_length, acpi_owner_id owner_id);
  69
  70 /*******************************************************************************
  71  *
  72  * FUNCTION:    acpi_ps_get_arguments
  73  *
  74  * PARAMETERS:  walk_state          - Current state
  75  *              aml_op_start        - Op start in AML
  76  *              op                  - Current Op
  77  *
  78  * RETURN:      Status
  79  *
  80  * DESCRIPTION: Get arguments for passed Op.
  81  *
  82  ******************************************************************************/
  83
  84 static acpi_status
  85 acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
  86                       u8 * aml_op_start, union acpi_parse_object *op)
  87 {
  88         acpi_status status = AE_OK;
  89         union acpi_parse_object *arg = NULL;
  90         const struct acpi_opcode_info *op_info;
  91
  92         ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state);
  93
  94         switch (op->common.aml_opcode) {
  95         case AML_BYTE_OP:       /* AML_BYTEDATA_ARG */
  96         case AML_WORD_OP:       /* AML_WORDDATA_ARG */
  97         case AML_DWORD_OP:      /* AML_DWORDATA_ARG */
  98         case AML_QWORD_OP:      /* AML_QWORDATA_ARG */
  99         case AML_STRING_OP:     /* AML_ASCIICHARLIST_ARG */
 100
 101                 /* Fill in constant or string argument directly */
 102
 103                 acpi_ps_get_next_simple_arg(&(walk_state->parser_state),
 104                                             GET_CURRENT_ARG_TYPE(walk_state->
 105                                                                  arg_types),
 106                                             op);
 107                 break;
 108
 109         case AML_INT_NAMEPATH_OP:       /* AML_NAMESTRING_ARG */
 110
 111                 status =
 112                     acpi_ps_get_next_namepath(walk_state,
 113                                               &(walk_state->parser_state), op,
 114                                               1);
 115                 if (ACPI_FAILURE(status)) {
 116                         return_ACPI_STATUS(status);
 117                 }
 118
 119                 walk_state->arg_types = 0;
 120                 break;
 121
 122         default:
 123                 /*
 124                  * Op is not a constant or string, append each argument to the Op
 125                  */
 126                 while (GET_CURRENT_ARG_TYPE(walk_state->arg_types)
 127                        && !walk_state->arg_count) {
 128                         walk_state->aml_offset =
 129                             (u32) ACPI_PTR_DIFF(walk_state->parser_state.aml,
 130                                                 walk_state->parser_state.
 131                                                 aml_start);
 132
 133                         status =
 134                             acpi_ps_get_next_arg(walk_state,
 135                                                  &(walk_state->parser_state),
 136                                                  GET_CURRENT_ARG_TYPE
 137                                                  (walk_state->arg_types), &arg);
 138                         if (ACPI_FAILURE(status)) {
 139                                 return_ACPI_STATUS(status);
 140                         }
 141
 142                         if (arg) {
 143                                 arg->common.aml_offset = walk_state->aml_offset;
 144                                 acpi_ps_append_arg(op, arg);
 145                         }
 146
 147                         INCREMENT_ARG_LIST(walk_state->arg_types);
 148                 }
 149
 150                 /*
 151                  * Handle executable code at "module-level". This refers to
 152                  * executable opcodes that appear outside of any control method.
 153                  */
 154                 if ((walk_state->pass_number <= ACPI_IMODE_LOAD_PASS2) &&
 155                     ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) {
 156                         /*
 157                          * We want to skip If/Else/While constructs during Pass1 because we
 158                          * want to actually conditionally execute the code during Pass2.
 159                          *
 160                          * Except for disassembly, where we always want to walk the
 161                          * If/Else/While packages
 162                          */
 163                         switch (op->common.aml_opcode) {
 164                         case AML_IF_OP:
 165                         case AML_ELSE_OP:
 166                         case AML_WHILE_OP:
 167                                 /*
 168                                  * Currently supported module-level opcodes are:
 169                                  * IF/ELSE/WHILE. These appear to be the most common,
 170                                  * and easiest to support since they open an AML
 171                                  * package.
 172                                  */
 173                                 if (walk_state->pass_number ==
 174                                     ACPI_IMODE_LOAD_PASS1) {
 175                                         acpi_ps_link_module_code(op->common.
 176                                                                  parent,
 177                                                                  aml_op_start,
 178                                                                  (u32)
 179                                                                  (walk_state->
 180                                                                  parser_state.
 181                                                                  pkg_end -
 182                                                                  aml_op_start),
 183                                                                  walk_state->
 184                                                                  owner_id);
 185                                 }
 186
 187                                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 188                                                   "Pass1: Skipping an If/Else/While body\n"));
 189
 190                                 /* Skip body of if/else/while in pass 1 */
 191
 192                                 walk_state->parser_state.aml =
 193                                     walk_state->parser_state.pkg_end;
 194                                 walk_state->arg_count = 0;
 195                                 break;
 196
 197                         default:
 198                                 /*
 199                                  * Check for an unsupported executable opcode at module
 200                                  * level. We must be in PASS1, the parent must be a SCOPE,
 201                                  * The opcode class must be EXECUTE, and the opcode must
 202                                  * not be an argument to another opcode.
 203                                  */
 204                                 if ((walk_state->pass_number ==
 205                                      ACPI_IMODE_LOAD_PASS1)
 206                                     && (op->common.parent->common.aml_opcode ==
 207                                         AML_SCOPE_OP)) {
 208                                         op_info =
 209                                             acpi_ps_get_opcode_info(op->common.
 210                                                                     aml_opcode);
 211                                         if ((op_info->class ==
 212                                              AML_CLASS_EXECUTE) && (!arg)) {
 213                                                 ACPI_WARNING((AE_INFO,
 214                                                               "Unsupported module-level executable opcode "
 215                                                               "0x%.2X at table offset 0x%.4X",
 216                                                               op->common.
 217                                                               aml_opcode,
 218                                                               (u32)
 219                                                               (ACPI_PTR_DIFF
 220                                                                (aml_op_start,
 221                                                                 walk_state->
 222                                                                 parser_state.
 223                                                                 aml_start) +
 224                                                                sizeof(struct
 225                                                                       acpi_table_header))));
 226                                         }
 227                                 }
 228                                 break;
 229                         }
 230                 }
 231
 232                 /* Special processing for certain opcodes */
 233
 234                 switch (op->common.aml_opcode) {
 235                 case AML_METHOD_OP:
 236                         /*
 237                          * Skip parsing of control method because we don't have enough
 238                          * info in the first pass to parse it correctly.
 239                          *
 240                          * Save the length and address of the body
 241                          */
 242                         op->named.data = walk_state->parser_state.aml;
 243                         op->named.length = (u32)
 244                             (walk_state->parser_state.pkg_end -
 245                              walk_state->parser_state.aml);
 246
 247                         /* Skip body of method */
 248
 249                         walk_state->parser_state.aml =
 250                             walk_state->parser_state.pkg_end;
 251                         walk_state->arg_count = 0;
 252                         break;
 253
 254                 case AML_BUFFER_OP:
 255                 case AML_PACKAGE_OP:
 256                 case AML_VAR_PACKAGE_OP:
 257
 258                         if ((op->common.parent) &&
 259                             (op->common.parent->common.aml_opcode ==
 260                              AML_NAME_OP)
 261                             && (walk_state->pass_number <=
 262                                 ACPI_IMODE_LOAD_PASS2)) {
 263                                 /*
 264                                  * Skip parsing of Buffers and Packages because we don't have
 265                                  * enough info in the first pass to parse them correctly.
 266                                  */
 267                                 op->named.data = aml_op_start;
 268                                 op->named.length = (u32)
 269                                     (walk_state->parser_state.pkg_end -
 270                                      aml_op_start);
 271
 272                                 /* Skip body */
 273
 274                                 walk_state->parser_state.aml =
 275                                     walk_state->parser_state.pkg_end;
 276                                 walk_state->arg_count = 0;
 277                         }
 278                         break;
 279
 280                 case AML_WHILE_OP:
 281
 282                         if (walk_state->control_state) {
 283                                 walk_state->control_state->control.package_end =
 284                                     walk_state->parser_state.pkg_end;
 285                         }
 286                         break;
 287
 288                 default:
 289
 290                         /* No action for all other opcodes */
 291
 292                         break;
 293                 }
 294
 295                 break;
 296         }
 297
 298         return_ACPI_STATUS(AE_OK);
 299 }
 300
 301 /*******************************************************************************
 302  *
 303  * FUNCTION:    acpi_ps_link_module_code
 304  *
 305  * PARAMETERS:  parent_op           - Parent parser op
 306  *              aml_start           - Pointer to the AML
 307  *              aml_length          - Length of executable AML
 308  *              owner_id            - owner_id of module level code
 309  *
 310  * RETURN:      None.
 311  *
 312  * DESCRIPTION: Wrap the module-level code with a method object and link the
 313  *              object to the global list. Note, the mutex field of the method
 314  *              object is used to link multiple module-level code objects.
 315  *
 316  ******************************************************************************/
 317
 318 static void
 319 acpi_ps_link_module_code(union acpi_parse_object *parent_op,
 320                          u8 *aml_start, u32 aml_length, acpi_owner_id owner_id)
 321 {
 322         union acpi_operand_object *prev;
 323         union acpi_operand_object *next;
 324         union acpi_operand_object *method_obj;
 325         struct acpi_namespace_node *parent_node;
 326
 327         /* Get the tail of the list */
 328
 329         prev = next = acpi_gbl_module_code_list;
 330         while (next) {
 331                 prev = next;
 332                 next = next->method.mutex;
 333         }
 334
 335         /*
 336          * Insert the module level code into the list. Merge it if it is
 337          * adjacent to the previous element.
 338          */
 339         if (!prev ||
 340             ((prev->method.aml_start + prev->method.aml_length) != aml_start)) {
 341
 342                 /* Create, initialize, and link a new temporary method object */
 343
 344                 method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
 345                 if (!method_obj) {
 346                         return;
 347                 }
 348
 349                 if (parent_op->common.node) {
 350                         parent_node = parent_op->common.node;
 351                 } else {
 352                         parent_node = acpi_gbl_root_node;
 353                 }
 354
 355                 method_obj->method.aml_start = aml_start;
 356                 method_obj->method.aml_length = aml_length;
 357                 method_obj->method.owner_id = owner_id;
 358                 method_obj->method.info_flags |= ACPI_METHOD_MODULE_LEVEL;
 359
 360                 /*
 361                  * Save the parent node in next_object. This is cheating, but we
 362                  * don't want to expand the method object.
 363                  */
 364                 method_obj->method.next_object =
 365                     ACPI_CAST_PTR(union acpi_operand_object, parent_node);
 366
 367                 if (!prev) {
 368                         acpi_gbl_module_code_list = method_obj;
 369                 } else {
 370                         prev->method.mutex = method_obj;
 371                 }
 372         } else {
 373                 prev->method.aml_length += aml_length;
 374         }
 375 }
 376
 377 /*******************************************************************************
 378  *
 379  * FUNCTION:    acpi_ps_parse_loop
 380  *
 381  * PARAMETERS:  walk_state          - Current state
 382  *
 383  * RETURN:      Status
 384  *
 385  * DESCRIPTION: Parse AML (pointed to by the current parser state) and return
 386  *              a tree of ops.
 387  *
 388  ******************************************************************************/
 389
 390 acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state)
 391 {
 392         acpi_status status = AE_OK;
 393         union acpi_parse_object *op = NULL;     /* current op */
 394         struct acpi_parse_state *parser_state;
 395         u8 *aml_op_start = NULL;
 396
 397         ACPI_FUNCTION_TRACE_PTR(ps_parse_loop, walk_state);
 398
 399         if (walk_state->descending_callback == NULL) {
 400                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 401         }
 402
 403         parser_state = &walk_state->parser_state;
 404         walk_state->arg_types = 0;
 405
 406 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
 407
 408         if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) {
 409
 410                 /* We are restarting a preempted control method */
 411
 412                 if (acpi_ps_has_completed_scope(parser_state)) {
 413                         /*
 414                          * We must check if a predicate to an IF or WHILE statement
 415                          * was just completed
 416                          */
 417                         if ((parser_state->scope->parse_scope.op) &&
 418                             ((parser_state->scope->parse_scope.op->common.
 419                               aml_opcode == AML_IF_OP)
 420                              || (parser_state->scope->parse_scope.op->common.
 421                                  aml_opcode == AML_WHILE_OP))
 422                             && (walk_state->control_state)
 423                             && (walk_state->control_state->common.state ==
 424                                 ACPI_CONTROL_PREDICATE_EXECUTING)) {
 425                                 /*
 426                                  * A predicate was just completed, get the value of the
 427                                  * predicate and branch based on that value
 428                                  */
 429                                 walk_state->op = NULL;
 430                                 status =
 431                                     acpi_ds_get_predicate_value(walk_state,
 432                                                                 ACPI_TO_POINTER
 433                                                                 (TRUE));
 434                                 if (ACPI_FAILURE(status)
 435                                     && ((status & AE_CODE_MASK) !=
 436                                         AE_CODE_CONTROL)) {
 437                                         if (status == AE_AML_NO_RETURN_VALUE) {
 438                                                 ACPI_EXCEPTION((AE_INFO, status,
 439                                                                 "Invoked method did not return a value"));
 440                                         }
 441
 442                                         ACPI_EXCEPTION((AE_INFO, status,
 443                                                         "GetPredicate Failed"));
 444                                         return_ACPI_STATUS(status);
 445                                 }
 446
 447                                 status =
 448                                     acpi_ps_next_parse_state(walk_state, op,
 449                                                              status);
 450                         }
 451
 452                         acpi_ps_pop_scope(parser_state, &op,
 453                                           &walk_state->arg_types,
 454                                           &walk_state->arg_count);
 455                         ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 456                                           "Popped scope, Op=%p\n", op));
 457                 } else if (walk_state->prev_op) {
 458
 459                         /* We were in the middle of an op */
 460
 461                         op = walk_state->prev_op;
 462                         walk_state->arg_types = walk_state->prev_arg_types;
 463                 }
 464         }
 465 #endif
 466
 467         /* Iterative parsing loop, while there is more AML to process: */
 468
 469         while ((parser_state->aml < parser_state->aml_end) || (op)) {
 470                 aml_op_start = parser_state->aml;
 471                 if (!op) {
 472                         status =
 473                             acpi_ps_create_op(walk_state, aml_op_start, &op);
 474                         if (ACPI_FAILURE(status)) {
 475                                 if (status == AE_CTRL_PARSE_CONTINUE) {
 476                                         continue;
 477                                 }
 478
 479                                 if (status == AE_CTRL_PARSE_PENDING) {
 480                                         status = AE_OK;
 481                                 }
 482
 483                                 status =
 484                                     acpi_ps_complete_op(walk_state, &op,
 485                                                         status);
 486                                 if (ACPI_FAILURE(status)) {
 487                                         return_ACPI_STATUS(status);
 488                                 }
 489
 490                                 continue;
 491                         }
 492
 493                         op->common.aml_offset = walk_state->aml_offset;
 494
 495                         if (walk_state->op_info) {
 496                                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 497                                                   "Opcode %4.4X [%s] Op %p Aml %p AmlOffset %5.5X\n",
 498                                                   (u32) op->common.aml_opcode,
 499                                                   walk_state->op_info->name, op,
 500                                                   parser_state->aml,
 501                                                   op->common.aml_offset));
 502                         }
 503                 }
 504
 505                 /*
 506                  * Start arg_count at zero because we don't know if there are
 507                  * any args yet
 508                  */
 509                 walk_state->arg_count = 0;
 510
 511                 /* Are there any arguments that must be processed? */
 512
 513                 if (walk_state->arg_types) {
 514
 515                         /* Get arguments */
 516
 517                         status =
 518                             acpi_ps_get_arguments(walk_state, aml_op_start, op);
 519                         if (ACPI_FAILURE(status)) {
 520                                 status =
 521                                     acpi_ps_complete_op(walk_state, &op,
 522                                                         status);
 523                                 if (ACPI_FAILURE(status)) {
 524                                         return_ACPI_STATUS(status);
 525                                 }
 526
 527                                 continue;
 528                         }
 529                 }
 530
 531                 /* Check for arguments that need to be processed */
 532
 533                 if (walk_state->arg_count) {
 534                         /*
 535                          * There are arguments (complex ones), push Op and
 536                          * prepare for argument
 537                          */
 538                         status = acpi_ps_push_scope(parser_state, op,
 539                                                     walk_state->arg_types,
 540                                                     walk_state->arg_count);
 541                         if (ACPI_FAILURE(status)) {
 542                                 status =
 543                                     acpi_ps_complete_op(walk_state, &op,
 544                                                         status);
 545                                 if (ACPI_FAILURE(status)) {
 546                                         return_ACPI_STATUS(status);
 547                                 }
 548
 549                                 continue;
 550                         }
 551
 552                         op = NULL;
 553                         continue;
 554                 }
 555
 556                 /*
 557                  * All arguments have been processed -- Op is complete,
 558                  * prepare for next
 559                  */
 560                 walk_state->op_info =
 561                     acpi_ps_get_opcode_info(op->common.aml_opcode);
 562                 if (walk_state->op_info->flags & AML_NAMED) {
 563                         if (op->common.aml_opcode == AML_REGION_OP ||
 564                             op->common.aml_opcode == AML_DATA_REGION_OP) {
 565                                 /*
 566                                  * Skip parsing of control method or opregion body,
 567                                  * because we don't have enough info in the first pass
 568                                  * to parse them correctly.
 569                                  *
 570                                  * Completed parsing an op_region declaration, we now
 571                                  * know the length.
 572                                  */
 573                                 op->named.length =
 574                                     (u32) (parser_state->aml - op->named.data);
 575                         }
 576                 }
 577
 578                 if (walk_state->op_info->flags & AML_CREATE) {
 579                         /*
 580                          * Backup to beginning of create_XXXfield declaration (1 for
 581                          * Opcode)
 582                          *
 583                          * body_length is unknown until we parse the body
 584                          */
 585                         op->named.length =
 586                             (u32) (parser_state->aml - op->named.data);
 587                 }
 588
 589                 if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
 590                         /*
 591                          * Backup to beginning of bank_field declaration
 592                          *
 593                          * body_length is unknown until we parse the body
 594                          */
 595                         op->named.length =
 596                             (u32) (parser_state->aml - op->named.data);
 597                 }
 598
 599                 /* This op complete, notify the dispatcher */
 600
 601                 if (walk_state->ascending_callback != NULL) {
 602                         walk_state->op = op;
 603                         walk_state->opcode = op->common.aml_opcode;
 604
 605                         status = walk_state->ascending_callback(walk_state);
 606                         status =
 607                             acpi_ps_next_parse_state(walk_state, op, status);
 608                         if (status == AE_CTRL_PENDING) {
 609                                 status = AE_OK;
 610                         }
 611                 }
 612
 613                 status = acpi_ps_complete_op(walk_state, &op, status);
 614                 if (ACPI_FAILURE(status)) {
 615                         return_ACPI_STATUS(status);
 616                 }
 617
 618         }                       /* while parser_state->Aml */
 619
 620         status = acpi_ps_complete_final_op(walk_state, op, status);
 621         return_ACPI_STATUS(status);
 622 }