kernel/drivers/acpi/acpica/psobject.c

   1 /******************************************************************************
   2  *
   3  * Module Name: psobject - Support for parse objects
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, 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 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acparser.h"
  47 #include "amlcode.h"
  48
  49 #define _COMPONENT          ACPI_PARSER
  50 ACPI_MODULE_NAME("psobject")
  51
  52 /* Local prototypes */
  53 static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state);
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_ps_get_aml_opcode
  58  *
  59  * PARAMETERS:  walk_state          - Current state
  60  *
  61  * RETURN:      Status
  62  *
  63  * DESCRIPTION: Extract the next AML opcode from the input stream.
  64  *
  65  ******************************************************************************/
  66
  67 static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state)
  68 {
  69
  70         ACPI_FUNCTION_TRACE_PTR(ps_get_aml_opcode, walk_state);
  71
  72         walk_state->aml_offset =
  73             (u32)ACPI_PTR_DIFF(walk_state->parser_state.aml,
  74                                walk_state->parser_state.aml_start);
  75         walk_state->opcode = acpi_ps_peek_opcode(&(walk_state->parser_state));
  76
  77         /*
  78          * First cut to determine what we have found:
  79          * 1) A valid AML opcode
  80          * 2) A name string
  81          * 3) An unknown/invalid opcode
  82          */
  83         walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode);
  84
  85         switch (walk_state->op_info->class) {
  86         case AML_CLASS_ASCII:
  87         case AML_CLASS_PREFIX:
  88                 /*
  89                  * Starts with a valid prefix or ASCII char, this is a name
  90                  * string. Convert the bare name string to a namepath.
  91                  */
  92                 walk_state->opcode = AML_INT_NAMEPATH_OP;
  93                 walk_state->arg_types = ARGP_NAMESTRING;
  94                 break;
  95
  96         case AML_CLASS_UNKNOWN:
  97
  98                 /* The opcode is unrecognized. Complain and skip unknown opcodes */
  99
 100                 if (walk_state->pass_number == 2) {
 101                         ACPI_ERROR((AE_INFO,
 102                                     "Unknown opcode 0x%.2X at table offset 0x%.4X, ignoring",
 103                                     walk_state->opcode,
 104                                     (u32)(walk_state->aml_offset +
 105                                           sizeof(struct acpi_table_header))));
 106
 107                         ACPI_DUMP_BUFFER((walk_state->parser_state.aml - 16),
 108                                          48);
 109
 110 #ifdef ACPI_ASL_COMPILER
 111                         /*
 112                          * This is executed for the disassembler only. Output goes
 113                          * to the disassembled ASL output file.
 114                          */
 115                         acpi_os_printf
 116                             ("/*\nError: Unknown opcode 0x%.2X at table offset 0x%.4X, context:\n",
 117                              walk_state->opcode,
 118                              (u32)(walk_state->aml_offset +
 119                                    sizeof(struct acpi_table_header)));
 120
 121                         /* Dump the context surrounding the invalid opcode */
 122
 123                         acpi_ut_dump_buffer(((u8 *)walk_state->parser_state.
 124                                              aml - 16), 48, DB_BYTE_DISPLAY,
 125                                             (walk_state->aml_offset +
 126                                              sizeof(struct acpi_table_header) -
 127                                              16));
 128                         acpi_os_printf(" */\n");
 129 #endif
 130                 }
 131
 132                 /* Increment past one-byte or two-byte opcode */
 133
 134                 walk_state->parser_state.aml++;
 135                 if (walk_state->opcode > 0xFF) {        /* Can only happen if first byte is 0x5B */
 136                         walk_state->parser_state.aml++;
 137                 }
 138
 139                 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
 140
 141         default:
 142
 143                 /* Found opcode info, this is a normal opcode */
 144
 145                 walk_state->parser_state.aml +=
 146                     acpi_ps_get_opcode_size(walk_state->opcode);
 147                 walk_state->arg_types = walk_state->op_info->parse_args;
 148                 break;
 149         }
 150
 151         return_ACPI_STATUS(AE_OK);
 152 }
 153
 154 /*******************************************************************************
 155  *
 156  * FUNCTION:    acpi_ps_build_named_op
 157  *
 158  * PARAMETERS:  walk_state          - Current state
 159  *              aml_op_start        - Begin of named Op in AML
 160  *              unnamed_op          - Early Op (not a named Op)
 161  *              op                  - Returned Op
 162  *
 163  * RETURN:      Status
 164  *
 165  * DESCRIPTION: Parse a named Op
 166  *
 167  ******************************************************************************/
 168
 169 acpi_status
 170 acpi_ps_build_named_op(struct acpi_walk_state *walk_state,
 171                        u8 *aml_op_start,
 172                        union acpi_parse_object *unnamed_op,
 173                        union acpi_parse_object **op)
 174 {
 175         acpi_status status = AE_OK;
 176         union acpi_parse_object *arg = NULL;
 177
 178         ACPI_FUNCTION_TRACE_PTR(ps_build_named_op, walk_state);
 179
 180         unnamed_op->common.value.arg = NULL;
 181         unnamed_op->common.arg_list_length = 0;
 182         unnamed_op->common.aml_opcode = walk_state->opcode;
 183
 184         /*
 185          * Get and append arguments until we find the node that contains
 186          * the name (the type ARGP_NAME).
 187          */
 188         while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) &&
 189                (GET_CURRENT_ARG_TYPE(walk_state->arg_types) != ARGP_NAME)) {
 190                 status =
 191                     acpi_ps_get_next_arg(walk_state,
 192                                          &(walk_state->parser_state),
 193                                          GET_CURRENT_ARG_TYPE(walk_state->
 194                                                               arg_types), &arg);
 195                 if (ACPI_FAILURE(status)) {
 196                         return_ACPI_STATUS(status);
 197                 }
 198
 199                 acpi_ps_append_arg(unnamed_op, arg);
 200                 INCREMENT_ARG_LIST(walk_state->arg_types);
 201         }
 202
 203         /*
 204          * Make sure that we found a NAME and didn't run out of arguments
 205          */
 206         if (!GET_CURRENT_ARG_TYPE(walk_state->arg_types)) {
 207                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
 208         }
 209
 210         /* We know that this arg is a name, move to next arg */
 211
 212         INCREMENT_ARG_LIST(walk_state->arg_types);
 213
 214         /*
 215          * Find the object. This will either insert the object into
 216          * the namespace or simply look it up
 217          */
 218         walk_state->op = NULL;
 219
 220         status = walk_state->descending_callback(walk_state, op);
 221         if (ACPI_FAILURE(status)) {
 222                 if (status != AE_CTRL_TERMINATE) {
 223                         ACPI_EXCEPTION((AE_INFO, status,
 224                                         "During name lookup/catalog"));
 225                 }
 226                 return_ACPI_STATUS(status);
 227         }
 228
 229         if (!*op) {
 230                 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
 231         }
 232
 233         status = acpi_ps_next_parse_state(walk_state, *op, status);
 234         if (ACPI_FAILURE(status)) {
 235                 if (status == AE_CTRL_PENDING) {
 236                         status = AE_CTRL_PARSE_PENDING;
 237                 }
 238                 return_ACPI_STATUS(status);
 239         }
 240
 241         acpi_ps_append_arg(*op, unnamed_op->common.value.arg);
 242
 243         if ((*op)->common.aml_opcode == AML_REGION_OP ||
 244             (*op)->common.aml_opcode == AML_DATA_REGION_OP) {
 245                 /*
 246                  * Defer final parsing of an operation_region body, because we don't
 247                  * have enough info in the first pass to parse it correctly (i.e.,
 248                  * there may be method calls within the term_arg elements of the body.)
 249                  *
 250                  * However, we must continue parsing because the opregion is not a
 251                  * standalone package -- we don't know where the end is at this point.
 252                  *
 253                  * (Length is unknown until parse of the body complete)
 254                  */
 255                 (*op)->named.data = aml_op_start;
 256                 (*op)->named.length = 0;
 257         }
 258
 259         return_ACPI_STATUS(AE_OK);
 260 }
 261
 262 /*******************************************************************************
 263  *
 264  * FUNCTION:    acpi_ps_create_op
 265  *
 266  * PARAMETERS:  walk_state          - Current state
 267  *              aml_op_start        - Op start in AML
 268  *              new_op              - Returned Op
 269  *
 270  * RETURN:      Status
 271  *
 272  * DESCRIPTION: Get Op from AML
 273  *
 274  ******************************************************************************/
 275
 276 acpi_status
 277 acpi_ps_create_op(struct acpi_walk_state *walk_state,
 278                   u8 *aml_op_start, union acpi_parse_object **new_op)
 279 {
 280         acpi_status status = AE_OK;
 281         union acpi_parse_object *op;
 282         union acpi_parse_object *named_op = NULL;
 283         union acpi_parse_object *parent_scope;
 284         u8 argument_count;
 285         const struct acpi_opcode_info *op_info;
 286
 287         ACPI_FUNCTION_TRACE_PTR(ps_create_op, walk_state);
 288
 289         status = acpi_ps_get_aml_opcode(walk_state);
 290         if (status == AE_CTRL_PARSE_CONTINUE) {
 291                 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
 292         }
 293
 294         /* Create Op structure and append to parent's argument list */
 295
 296         walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode);
 297         op = acpi_ps_alloc_op(walk_state->opcode);
 298         if (!op) {
 299                 return_ACPI_STATUS(AE_NO_MEMORY);
 300         }
 301
 302         if (walk_state->op_info->flags & AML_NAMED) {
 303                 status =
 304                     acpi_ps_build_named_op(walk_state, aml_op_start, op,
 305                                            &named_op);
 306                 acpi_ps_free_op(op);
 307                 if (ACPI_FAILURE(status)) {
 308                         return_ACPI_STATUS(status);
 309                 }
 310
 311                 *new_op = named_op;
 312                 return_ACPI_STATUS(AE_OK);
 313         }
 314
 315         /* Not a named opcode, just allocate Op and append to parent */
 316
 317         if (walk_state->op_info->flags & AML_CREATE) {
 318                 /*
 319                  * Backup to beginning of create_XXXfield declaration
 320                  * body_length is unknown until we parse the body
 321                  */
 322                 op->named.data = aml_op_start;
 323                 op->named.length = 0;
 324         }
 325
 326         if (walk_state->opcode == AML_BANK_FIELD_OP) {
 327                 /*
 328                  * Backup to beginning of bank_field declaration
 329                  * body_length is unknown until we parse the body
 330                  */
 331                 op->named.data = aml_op_start;
 332                 op->named.length = 0;
 333         }
 334
 335         parent_scope = acpi_ps_get_parent_scope(&(walk_state->parser_state));
 336         acpi_ps_append_arg(parent_scope, op);
 337
 338         if (parent_scope) {
 339                 op_info =
 340                     acpi_ps_get_opcode_info(parent_scope->common.aml_opcode);
 341                 if (op_info->flags & AML_HAS_TARGET) {
 342                         argument_count =
 343                             acpi_ps_get_argument_count(op_info->type);
 344                         if (parent_scope->common.arg_list_length >
 345                             argument_count) {
 346                                 op->common.flags |= ACPI_PARSEOP_TARGET;
 347                         }
 348                 } else if (parent_scope->common.aml_opcode == AML_INCREMENT_OP) {
 349                         op->common.flags |= ACPI_PARSEOP_TARGET;
 350                 }
 351         }
 352
 353         if (walk_state->descending_callback != NULL) {
 354                 /*
 355                  * Find the object. This will either insert the object into
 356                  * the namespace or simply look it up
 357                  */
 358                 walk_state->op = *new_op = op;
 359
 360                 status = walk_state->descending_callback(walk_state, &op);
 361                 status = acpi_ps_next_parse_state(walk_state, op, status);
 362                 if (status == AE_CTRL_PENDING) {
 363                         status = AE_CTRL_PARSE_PENDING;
 364                 }
 365         }
 366
 367         return_ACPI_STATUS(status);
 368 }
 369
 370 /*******************************************************************************
 371  *
 372  * FUNCTION:    acpi_ps_complete_op
 373  *
 374  * PARAMETERS:  walk_state          - Current state
 375  *              op                  - Returned Op
 376  *              status              - Parse status before complete Op
 377  *
 378  * RETURN:      Status
 379  *
 380  * DESCRIPTION: Complete Op
 381  *
 382  ******************************************************************************/
 383
 384 acpi_status
 385 acpi_ps_complete_op(struct acpi_walk_state *walk_state,
 386                     union acpi_parse_object **op, acpi_status status)
 387 {
 388         acpi_status status2;
 389
 390         ACPI_FUNCTION_TRACE_PTR(ps_complete_op, walk_state);
 391
 392         /*
 393          * Finished one argument of the containing scope
 394          */
 395         walk_state->parser_state.scope->parse_scope.arg_count--;
 396
 397         /* Close this Op (will result in parse subtree deletion) */
 398
 399         status2 = acpi_ps_complete_this_op(walk_state, *op);
 400         if (ACPI_FAILURE(status2)) {
 401                 return_ACPI_STATUS(status2);
 402         }
 403
 404         *op = NULL;
 405
 406         switch (status) {
 407         case AE_OK:
 408
 409                 break;
 410
 411         case AE_CTRL_TRANSFER:
 412
 413                 /* We are about to transfer to a called method */
 414
 415                 walk_state->prev_op = NULL;
 416                 walk_state->prev_arg_types = walk_state->arg_types;
 417                 return_ACPI_STATUS(status);
 418
 419         case AE_CTRL_END:
 420
 421                 acpi_ps_pop_scope(&(walk_state->parser_state), op,
 422                                   &walk_state->arg_types,
 423                                   &walk_state->arg_count);
 424
 425                 if (*op) {
 426                         walk_state->op = *op;
 427                         walk_state->op_info =
 428                             acpi_ps_get_opcode_info((*op)->common.aml_opcode);
 429                         walk_state->opcode = (*op)->common.aml_opcode;
 430
 431                         status = walk_state->ascending_callback(walk_state);
 432                         status =
 433                             acpi_ps_next_parse_state(walk_state, *op, status);
 434
 435                         status2 = acpi_ps_complete_this_op(walk_state, *op);
 436                         if (ACPI_FAILURE(status2)) {
 437                                 return_ACPI_STATUS(status2);
 438                         }
 439                 }
 440
 441                 status = AE_OK;
 442                 break;
 443
 444         case AE_CTRL_BREAK:
 445         case AE_CTRL_CONTINUE:
 446
 447                 /* Pop off scopes until we find the While */
 448
 449                 while (!(*op) || ((*op)->common.aml_opcode != AML_WHILE_OP)) {
 450                         acpi_ps_pop_scope(&(walk_state->parser_state), op,
 451                                           &walk_state->arg_types,
 452                                           &walk_state->arg_count);
 453                 }
 454
 455                 /* Close this iteration of the While loop */
 456
 457                 walk_state->op = *op;
 458                 walk_state->op_info =
 459                     acpi_ps_get_opcode_info((*op)->common.aml_opcode);
 460                 walk_state->opcode = (*op)->common.aml_opcode;
 461
 462                 status = walk_state->ascending_callback(walk_state);
 463                 status = acpi_ps_next_parse_state(walk_state, *op, status);
 464
 465                 status2 = acpi_ps_complete_this_op(walk_state, *op);
 466                 if (ACPI_FAILURE(status2)) {
 467                         return_ACPI_STATUS(status2);
 468                 }
 469
 470                 status = AE_OK;
 471                 break;
 472
 473         case AE_CTRL_TERMINATE:
 474
 475                 /* Clean up */
 476                 do {
 477                         if (*op) {
 478                                 status2 =
 479                                     acpi_ps_complete_this_op(walk_state, *op);
 480                                 if (ACPI_FAILURE(status2)) {
 481                                         return_ACPI_STATUS(status2);
 482                                 }
 483
 484                                 acpi_ut_delete_generic_state
 485                                     (acpi_ut_pop_generic_state
 486                                      (&walk_state->control_state));
 487                         }
 488
 489                         acpi_ps_pop_scope(&(walk_state->parser_state), op,
 490                                           &walk_state->arg_types,
 491                                           &walk_state->arg_count);
 492
 493                 } while (*op);
 494
 495                 return_ACPI_STATUS(AE_OK);
 496
 497         default:                /* All other non-AE_OK status */
 498
 499                 do {
 500                         if (*op) {
 501                                 status2 =
 502                                     acpi_ps_complete_this_op(walk_state, *op);
 503                                 if (ACPI_FAILURE(status2)) {
 504                                         return_ACPI_STATUS(status2);
 505                                 }
 506                         }
 507
 508                         acpi_ps_pop_scope(&(walk_state->parser_state), op,
 509                                           &walk_state->arg_types,
 510                                           &walk_state->arg_count);
 511
 512                 } while (*op);
 513
 514 #if 0
 515                 /*
 516                  * TBD: Cleanup parse ops on error
 517                  */
 518                 if (*op == NULL) {
 519                         acpi_ps_pop_scope(parser_state, op,
 520                                           &walk_state->arg_types,
 521                                           &walk_state->arg_count);
 522                 }
 523 #endif
 524                 walk_state->prev_op = NULL;
 525                 walk_state->prev_arg_types = walk_state->arg_types;
 526                 return_ACPI_STATUS(status);
 527         }
 528
 529         /* This scope complete? */
 530
 531         if (acpi_ps_has_completed_scope(&(walk_state->parser_state))) {
 532                 acpi_ps_pop_scope(&(walk_state->parser_state), op,
 533                                   &walk_state->arg_types,
 534                                   &walk_state->arg_count);
 535                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Popped scope, Op=%p\n", *op));
 536         } else {
 537                 *op = NULL;
 538         }
 539
 540         return_ACPI_STATUS(AE_OK);
 541 }
 542
 543 /*******************************************************************************
 544  *
 545  * FUNCTION:    acpi_ps_complete_final_op
 546  *
 547  * PARAMETERS:  walk_state          - Current state
 548  *              op                  - Current Op
 549  *              status              - Current parse status before complete last
 550  *                                    Op
 551  *
 552  * RETURN:      Status
 553  *
 554  * DESCRIPTION: Complete last Op.
 555  *
 556  ******************************************************************************/
 557
 558 acpi_status
 559 acpi_ps_complete_final_op(struct acpi_walk_state *walk_state,
 560                           union acpi_parse_object *op, acpi_status status)
 561 {
 562         acpi_status status2;
 563
 564         ACPI_FUNCTION_TRACE_PTR(ps_complete_final_op, walk_state);
 565
 566         /*
 567          * Complete the last Op (if not completed), and clear the scope stack.
 568          * It is easily possible to end an AML "package" with an unbounded number
 569          * of open scopes (such as when several ASL blocks are closed with
 570          * sequential closing braces). We want to terminate each one cleanly.
 571          */
 572         ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "AML package complete at Op %p\n",
 573                           op));
 574         do {
 575                 if (op) {
 576                         if (walk_state->ascending_callback != NULL) {
 577                                 walk_state->op = op;
 578                                 walk_state->op_info =
 579                                     acpi_ps_get_opcode_info(op->common.
 580                                                             aml_opcode);
 581                                 walk_state->opcode = op->common.aml_opcode;
 582
 583                                 status =
 584                                     walk_state->ascending_callback(walk_state);
 585                                 status =
 586                                     acpi_ps_next_parse_state(walk_state, op,
 587                                                              status);
 588                                 if (status == AE_CTRL_PENDING) {
 589                                         status =
 590                                             acpi_ps_complete_op(walk_state, &op,
 591                                                                 AE_OK);
 592                                         if (ACPI_FAILURE(status)) {
 593                                                 return_ACPI_STATUS(status);
 594                                         }
 595                                 }
 596
 597                                 if (status == AE_CTRL_TERMINATE) {
 598                                         status = AE_OK;
 599
 600                                         /* Clean up */
 601                                         do {
 602                                                 if (op) {
 603                                                         status2 =
 604                                                             acpi_ps_complete_this_op
 605                                                             (walk_state, op);
 606                                                         if (ACPI_FAILURE
 607                                                             (status2)) {
 608                                                                 return_ACPI_STATUS
 609                                                                     (status2);
 610                                                         }
 611                                                 }
 612
 613                                                 acpi_ps_pop_scope(&
 614                                                                   (walk_state->
 615                                                                    parser_state),
 616                                                                   &op,
 617                                                                   &walk_state->
 618                                                                   arg_types,
 619                                                                   &walk_state->
 620                                                                   arg_count);
 621
 622                                         } while (op);
 623
 624                                         return_ACPI_STATUS(status);
 625                                 }
 626
 627                                 else if (ACPI_FAILURE(status)) {
 628
 629                                         /* First error is most important */
 630
 631                                         (void)
 632                                             acpi_ps_complete_this_op(walk_state,
 633                                                                      op);
 634                                         return_ACPI_STATUS(status);
 635                                 }
 636                         }
 637
 638                         status2 = acpi_ps_complete_this_op(walk_state, op);
 639                         if (ACPI_FAILURE(status2)) {
 640                                 return_ACPI_STATUS(status2);
 641                         }
 642                 }
 643
 644                 acpi_ps_pop_scope(&(walk_state->parser_state), &op,
 645                                   &walk_state->arg_types,
 646                                   &walk_state->arg_count);
 647
 648         } while (op);
 649
 650         return_ACPI_STATUS(status);
 651 }