drivers/acpi/acpica/exresop.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exresop - AML Interpreter operand/object resolution
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2008, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include "accommon.h"
  47 #include "amlcode.h"
  48 #include "acparser.h"
  49 #include "acinterp.h"
  50 #include "acnamesp.h"
  51
  52 #define _COMPONENT          ACPI_EXECUTER
  53 ACPI_MODULE_NAME("exresop")
  54
  55 /* Local prototypes */
  56 static acpi_status
  57 acpi_ex_check_object_type(acpi_object_type type_needed,
  58                           acpi_object_type this_type, void *object);
  59
  60 /*******************************************************************************
  61  *
  62  * FUNCTION:    acpi_ex_check_object_type
  63  *
  64  * PARAMETERS:  type_needed         Object type needed
  65  *              this_type           Actual object type
  66  *              Object              Object pointer
  67  *
  68  * RETURN:      Status
  69  *
  70  * DESCRIPTION: Check required type against actual type
  71  *
  72  ******************************************************************************/
  73
  74 static acpi_status
  75 acpi_ex_check_object_type(acpi_object_type type_needed,
  76                           acpi_object_type this_type, void *object)
  77 {
  78         ACPI_FUNCTION_ENTRY();
  79
  80         if (type_needed == ACPI_TYPE_ANY) {
  81
  82                 /* All types OK, so we don't perform any typechecks */
  83
  84                 return (AE_OK);
  85         }
  86
  87         if (type_needed == ACPI_TYPE_LOCAL_REFERENCE) {
  88                 /*
  89                  * Allow the AML "Constant" opcodes (Zero, One, etc.) to be reference
  90                  * objects and thus allow them to be targets.  (As per the ACPI
  91                  * specification, a store to a constant is a noop.)
  92                  */
  93                 if ((this_type == ACPI_TYPE_INTEGER) &&
  94                     (((union acpi_operand_object *)object)->common.
  95                      flags & AOPOBJ_AML_CONSTANT)) {
  96                         return (AE_OK);
  97                 }
  98         }
  99
 100         if (type_needed != this_type) {
 101                 ACPI_ERROR((AE_INFO,
 102                             "Needed type [%s], found [%s] %p",
 103                             acpi_ut_get_type_name(type_needed),
 104                             acpi_ut_get_type_name(this_type), object));
 105
 106                 return (AE_AML_OPERAND_TYPE);
 107         }
 108
 109         return (AE_OK);
 110 }
 111
 112 /*******************************************************************************
 113  *
 114  * FUNCTION:    acpi_ex_resolve_operands
 115  *
 116  * PARAMETERS:  Opcode              - Opcode being interpreted
 117  *              stack_ptr           - Pointer to the operand stack to be
 118  *                                    resolved
 119  *              walk_state          - Current state
 120  *
 121  * RETURN:      Status
 122  *
 123  * DESCRIPTION: Convert multiple input operands to the types required by the
 124  *              target operator.
 125  *
 126  *      Each 5-bit group in arg_types represents one required
 127  *      operand and indicates the required Type. The corresponding operand
 128  *      will be converted to the required type if possible, otherwise we
 129  *      abort with an exception.
 130  *
 131  ******************************************************************************/
 132
 133 acpi_status
 134 acpi_ex_resolve_operands(u16 opcode,
 135                          union acpi_operand_object ** stack_ptr,
 136                          struct acpi_walk_state * walk_state)
 137 {
 138         union acpi_operand_object *obj_desc;
 139         acpi_status status = AE_OK;
 140         u8 object_type;
 141         u32 arg_types;
 142         const struct acpi_opcode_info *op_info;
 143         u32 this_arg_type;
 144         acpi_object_type type_needed;
 145         u16 target_op = 0;
 146
 147         ACPI_FUNCTION_TRACE_U32(ex_resolve_operands, opcode);
 148
 149         op_info = acpi_ps_get_opcode_info(opcode);
 150         if (op_info->class == AML_CLASS_UNKNOWN) {
 151                 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 152         }
 153
 154         arg_types = op_info->runtime_args;
 155         if (arg_types == ARGI_INVALID_OPCODE) {
 156                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X", opcode));
 157
 158                 return_ACPI_STATUS(AE_AML_INTERNAL);
 159         }
 160
 161         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 162                           "Opcode %X [%s] RequiredOperandTypes=%8.8X\n",
 163                           opcode, op_info->name, arg_types));
 164
 165         /*
 166          * Normal exit is with (arg_types == 0) at end of argument list.
 167          * Function will return an exception from within the loop upon
 168          * finding an entry which is not (or cannot be converted
 169          * to) the required type; if stack underflows; or upon
 170          * finding a NULL stack entry (which should not happen).
 171          */
 172         while (GET_CURRENT_ARG_TYPE(arg_types)) {
 173                 if (!stack_ptr || !*stack_ptr) {
 174                         ACPI_ERROR((AE_INFO, "Null stack entry at %p",
 175                                     stack_ptr));
 176
 177                         return_ACPI_STATUS(AE_AML_INTERNAL);
 178                 }
 179
 180                 /* Extract useful items */
 181
 182                 obj_desc = *stack_ptr;
 183
 184                 /* Decode the descriptor type */
 185
 186                 switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) {
 187                 case ACPI_DESC_TYPE_NAMED:
 188
 189                         /* Namespace Node */
 190
 191                         object_type =
 192                             ((struct acpi_namespace_node *)obj_desc)->type;
 193
 194                         /*
 195                          * Resolve an alias object. The construction of these objects
 196                          * guarantees that there is only one level of alias indirection;
 197                          * thus, the attached object is always the aliased namespace node
 198                          */
 199                         if (object_type == ACPI_TYPE_LOCAL_ALIAS) {
 200                                 obj_desc =
 201                                     acpi_ns_get_attached_object((struct
 202                                                                  acpi_namespace_node
 203                                                                  *)obj_desc);
 204                                 *stack_ptr = obj_desc;
 205                                 object_type =
 206                                     ((struct acpi_namespace_node *)obj_desc)->
 207                                     type;
 208                         }
 209                         break;
 210
 211                 case ACPI_DESC_TYPE_OPERAND:
 212
 213                         /* ACPI internal object */
 214
 215                         object_type = obj_desc->common.type;
 216
 217                         /* Check for bad acpi_object_type */
 218
 219                         if (!acpi_ut_valid_object_type(object_type)) {
 220                                 ACPI_ERROR((AE_INFO,
 221                                             "Bad operand object type [%X]",
 222                                             object_type));
 223
 224                                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 225                         }
 226
 227                         if (object_type == (u8) ACPI_TYPE_LOCAL_REFERENCE) {
 228
 229                                 /* Validate the Reference */
 230
 231                                 switch (obj_desc->reference.class) {
 232                                 case ACPI_REFCLASS_DEBUG:
 233
 234                                         target_op = AML_DEBUG_OP;
 235
 236                                         /*lint -fallthrough */
 237
 238                                 case ACPI_REFCLASS_ARG:
 239                                 case ACPI_REFCLASS_LOCAL:
 240                                 case ACPI_REFCLASS_INDEX:
 241                                 case ACPI_REFCLASS_REFOF:
 242                                 case ACPI_REFCLASS_TABLE:       /* ddb_handle from LOAD_OP or LOAD_TABLE_OP */
 243                                 case ACPI_REFCLASS_NAME:        /* Reference to a named object */
 244
 245                                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 246                                                           "Operand is a Reference, Class [%s] %2.2X\n",
 247                                                           acpi_ut_get_reference_name
 248                                                           (obj_desc),
 249                                                           obj_desc->reference.
 250                                                           class));
 251                                         break;
 252
 253                                 default:
 254
 255                                         ACPI_ERROR((AE_INFO,
 256                                                     "Unknown Reference Class %2.2X in %p",
 257                                                     obj_desc->reference.class,
 258                                                     obj_desc));
 259
 260                                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 261                                 }
 262                         }
 263                         break;
 264
 265                 default:
 266
 267                         /* Invalid descriptor */
 268
 269                         ACPI_ERROR((AE_INFO, "Invalid descriptor %p [%s]",
 270                                     obj_desc,
 271                                     acpi_ut_get_descriptor_name(obj_desc)));
 272
 273                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 274                 }
 275
 276                 /* Get one argument type, point to the next */
 277
 278                 this_arg_type = GET_CURRENT_ARG_TYPE(arg_types);
 279                 INCREMENT_ARG_LIST(arg_types);
 280
 281                 /*
 282                  * Handle cases where the object does not need to be
 283                  * resolved to a value
 284                  */
 285                 switch (this_arg_type) {
 286                 case ARGI_REF_OR_STRING:        /* Can be a String or Reference */
 287
 288                         if ((ACPI_GET_DESCRIPTOR_TYPE(obj_desc) ==
 289                              ACPI_DESC_TYPE_OPERAND)
 290                             && (obj_desc->common.type == ACPI_TYPE_STRING)) {
 291                                 /*
 292                                  * String found - the string references a named object and
 293                                  * must be resolved to a node
 294                                  */
 295                                 goto next_operand;
 296                         }
 297
 298                         /*
 299                          * Else not a string - fall through to the normal Reference
 300                          * case below
 301                          */
 302                         /*lint -fallthrough */
 303
 304                 case ARGI_REFERENCE:    /* References: */
 305                 case ARGI_INTEGER_REF:
 306                 case ARGI_OBJECT_REF:
 307                 case ARGI_DEVICE_REF:
 308                 case ARGI_TARGETREF:    /* Allows implicit conversion rules before store */
 309                 case ARGI_FIXED_TARGET: /* No implicit conversion before store to target */
 310                 case ARGI_SIMPLE_TARGET:        /* Name, Local, or Arg - no implicit conversion  */
 311
 312                         /*
 313                          * Need an operand of type ACPI_TYPE_LOCAL_REFERENCE
 314                          * A Namespace Node is OK as-is
 315                          */
 316                         if (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) ==
 317                             ACPI_DESC_TYPE_NAMED) {
 318                                 goto next_operand;
 319                         }
 320
 321                         status =
 322                             acpi_ex_check_object_type(ACPI_TYPE_LOCAL_REFERENCE,
 323                                                       object_type, obj_desc);
 324                         if (ACPI_FAILURE(status)) {
 325                                 return_ACPI_STATUS(status);
 326                         }
 327                         goto next_operand;
 328
 329                 case ARGI_DATAREFOBJ:   /* Store operator only */
 330
 331                         /*
 332                          * We don't want to resolve index_op reference objects during
 333                          * a store because this would be an implicit de_ref_of operation.
 334                          * Instead, we just want to store the reference object.
 335                          * -- All others must be resolved below.
 336                          */
 337                         if ((opcode == AML_STORE_OP) &&
 338                             ((*stack_ptr)->common.type ==
 339                              ACPI_TYPE_LOCAL_REFERENCE)
 340                             && ((*stack_ptr)->reference.class == ACPI_REFCLASS_INDEX)) {
 341                                 goto next_operand;
 342                         }
 343                         break;
 344
 345                 default:
 346                         /* All cases covered above */
 347                         break;
 348                 }
 349
 350                 /*
 351                  * Resolve this object to a value
 352                  */
 353                 status = acpi_ex_resolve_to_value(stack_ptr, walk_state);
 354                 if (ACPI_FAILURE(status)) {
 355                         return_ACPI_STATUS(status);
 356                 }
 357
 358                 /* Get the resolved object */
 359
 360                 obj_desc = *stack_ptr;
 361
 362                 /*
 363                  * Check the resulting object (value) type
 364                  */
 365                 switch (this_arg_type) {
 366                         /*
 367                          * For the simple cases, only one type of resolved object
 368                          * is allowed
 369                          */
 370                 case ARGI_MUTEX:
 371
 372                         /* Need an operand of type ACPI_TYPE_MUTEX */
 373
 374                         type_needed = ACPI_TYPE_MUTEX;
 375                         break;
 376
 377                 case ARGI_EVENT:
 378
 379                         /* Need an operand of type ACPI_TYPE_EVENT */
 380
 381                         type_needed = ACPI_TYPE_EVENT;
 382                         break;
 383
 384                 case ARGI_PACKAGE:      /* Package */
 385
 386                         /* Need an operand of type ACPI_TYPE_PACKAGE */
 387
 388                         type_needed = ACPI_TYPE_PACKAGE;
 389                         break;
 390
 391                 case ARGI_ANYTYPE:
 392
 393                         /* Any operand type will do */
 394
 395                         type_needed = ACPI_TYPE_ANY;
 396                         break;
 397
 398                 case ARGI_DDBHANDLE:
 399
 400                         /* Need an operand of type ACPI_TYPE_DDB_HANDLE */
 401
 402                         type_needed = ACPI_TYPE_LOCAL_REFERENCE;
 403                         break;
 404
 405                         /*
 406                          * The more complex cases allow multiple resolved object types
 407                          */
 408                 case ARGI_INTEGER:
 409
 410                         /*
 411                          * Need an operand of type ACPI_TYPE_INTEGER,
 412                          * But we can implicitly convert from a STRING or BUFFER
 413                          * Aka - "Implicit Source Operand Conversion"
 414                          */
 415                         status =
 416                             acpi_ex_convert_to_integer(obj_desc, stack_ptr, 16);
 417                         if (ACPI_FAILURE(status)) {
 418                                 if (status == AE_TYPE) {
 419                                         ACPI_ERROR((AE_INFO,
 420                                                     "Needed [Integer/String/Buffer], found [%s] %p",
 421                                                     acpi_ut_get_object_type_name
 422                                                     (obj_desc), obj_desc));
 423
 424                                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 425                                 }
 426
 427                                 return_ACPI_STATUS(status);
 428                         }
 429
 430                         if (obj_desc != *stack_ptr) {
 431                                 acpi_ut_remove_reference(obj_desc);
 432                         }
 433                         goto next_operand;
 434
 435                 case ARGI_BUFFER:
 436
 437                         /*
 438                          * Need an operand of type ACPI_TYPE_BUFFER,
 439                          * But we can implicitly convert from a STRING or INTEGER
 440                          * Aka - "Implicit Source Operand Conversion"
 441                          */
 442                         status = acpi_ex_convert_to_buffer(obj_desc, stack_ptr);
 443                         if (ACPI_FAILURE(status)) {
 444                                 if (status == AE_TYPE) {
 445                                         ACPI_ERROR((AE_INFO,
 446                                                     "Needed [Integer/String/Buffer], found [%s] %p",
 447                                                     acpi_ut_get_object_type_name
 448                                                     (obj_desc), obj_desc));
 449
 450                                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 451                                 }
 452
 453                                 return_ACPI_STATUS(status);
 454                         }
 455
 456                         if (obj_desc != *stack_ptr) {
 457                                 acpi_ut_remove_reference(obj_desc);
 458                         }
 459                         goto next_operand;
 460
 461                 case ARGI_STRING:
 462
 463                         /*
 464                          * Need an operand of type ACPI_TYPE_STRING,
 465                          * But we can implicitly convert from a BUFFER or INTEGER
 466                          * Aka - "Implicit Source Operand Conversion"
 467                          */
 468                         status = acpi_ex_convert_to_string(obj_desc, stack_ptr,
 469                                                            ACPI_IMPLICIT_CONVERT_HEX);
 470                         if (ACPI_FAILURE(status)) {
 471                                 if (status == AE_TYPE) {
 472                                         ACPI_ERROR((AE_INFO,
 473                                                     "Needed [Integer/String/Buffer], found [%s] %p",
 474                                                     acpi_ut_get_object_type_name
 475                                                     (obj_desc), obj_desc));
 476
 477                                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 478                                 }
 479
 480                                 return_ACPI_STATUS(status);
 481                         }
 482
 483                         if (obj_desc != *stack_ptr) {
 484                                 acpi_ut_remove_reference(obj_desc);
 485                         }
 486                         goto next_operand;
 487
 488                 case ARGI_COMPUTEDATA:
 489
 490                         /* Need an operand of type INTEGER, STRING or BUFFER */
 491
 492                         switch (obj_desc->common.type) {
 493                         case ACPI_TYPE_INTEGER:
 494                         case ACPI_TYPE_STRING:
 495                         case ACPI_TYPE_BUFFER:
 496
 497                                 /* Valid operand */
 498                                 break;
 499
 500                         default:
 501                                 ACPI_ERROR((AE_INFO,
 502                                             "Needed [Integer/String/Buffer], found [%s] %p",
 503                                             acpi_ut_get_object_type_name
 504                                             (obj_desc), obj_desc));
 505
 506                                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 507                         }
 508                         goto next_operand;
 509
 510                 case ARGI_BUFFER_OR_STRING:
 511
 512                         /* Need an operand of type STRING or BUFFER */
 513
 514                         switch (obj_desc->common.type) {
 515                         case ACPI_TYPE_STRING:
 516                         case ACPI_TYPE_BUFFER:
 517
 518                                 /* Valid operand */
 519                                 break;
 520
 521                         case ACPI_TYPE_INTEGER:
 522
 523                                 /* Highest priority conversion is to type Buffer */
 524
 525                                 status =
 526                                     acpi_ex_convert_to_buffer(obj_desc,
 527                                                               stack_ptr);
 528                                 if (ACPI_FAILURE(status)) {
 529                                         return_ACPI_STATUS(status);
 530                                 }
 531
 532                                 if (obj_desc != *stack_ptr) {
 533                                         acpi_ut_remove_reference(obj_desc);
 534                                 }
 535                                 break;
 536
 537                         default:
 538                                 ACPI_ERROR((AE_INFO,
 539                                             "Needed [Integer/String/Buffer], found [%s] %p",
 540                                             acpi_ut_get_object_type_name
 541                                             (obj_desc), obj_desc));
 542
 543                                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 544                         }
 545                         goto next_operand;
 546
 547                 case ARGI_DATAOBJECT:
 548                         /*
 549                          * ARGI_DATAOBJECT is only used by the size_of operator.
 550                          * Need a buffer, string, package, or ref_of reference.
 551                          *
 552                          * The only reference allowed here is a direct reference to
 553                          * a namespace node.
 554                          */
 555                         switch (obj_desc->common.type) {
 556                         case ACPI_TYPE_PACKAGE:
 557                         case ACPI_TYPE_STRING:
 558                         case ACPI_TYPE_BUFFER:
 559                         case ACPI_TYPE_LOCAL_REFERENCE:
 560
 561                                 /* Valid operand */
 562                                 break;
 563
 564                         default:
 565                                 ACPI_ERROR((AE_INFO,
 566                                             "Needed [Buffer/String/Package/Reference], found [%s] %p",
 567                                             acpi_ut_get_object_type_name
 568                                             (obj_desc), obj_desc));
 569
 570                                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 571                         }
 572                         goto next_operand;
 573
 574                 case ARGI_COMPLEXOBJ:
 575
 576                         /* Need a buffer or package or (ACPI 2.0) String */
 577
 578                         switch (obj_desc->common.type) {
 579                         case ACPI_TYPE_PACKAGE:
 580                         case ACPI_TYPE_STRING:
 581                         case ACPI_TYPE_BUFFER:
 582
 583                                 /* Valid operand */
 584                                 break;
 585
 586                         default:
 587                                 ACPI_ERROR((AE_INFO,
 588                                             "Needed [Buffer/String/Package], found [%s] %p",
 589                                             acpi_ut_get_object_type_name
 590                                             (obj_desc), obj_desc));
 591
 592                                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 593                         }
 594                         goto next_operand;
 595
 596                 case ARGI_REGION_OR_BUFFER:     /* Used by Load() only */
 597
 598                         /* Need an operand of type REGION or a BUFFER (which could be a resolved region field) */
 599
 600                         switch (obj_desc->common.type) {
 601                         case ACPI_TYPE_BUFFER:
 602                         case ACPI_TYPE_REGION:
 603
 604                                 /* Valid operand */
 605                                 break;
 606
 607                         default:
 608                                 ACPI_ERROR((AE_INFO,
 609                                             "Needed [Region/Buffer], found [%s] %p",
 610                                             acpi_ut_get_object_type_name
 611                                             (obj_desc), obj_desc));
 612
 613                                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 614                         }
 615                         goto next_operand;
 616
 617                 case ARGI_DATAREFOBJ:
 618
 619                         /* Used by the Store() operator only */
 620
 621                         switch (obj_desc->common.type) {
 622                         case ACPI_TYPE_INTEGER:
 623                         case ACPI_TYPE_PACKAGE:
 624                         case ACPI_TYPE_STRING:
 625                         case ACPI_TYPE_BUFFER:
 626                         case ACPI_TYPE_BUFFER_FIELD:
 627                         case ACPI_TYPE_LOCAL_REFERENCE:
 628                         case ACPI_TYPE_LOCAL_REGION_FIELD:
 629                         case ACPI_TYPE_LOCAL_BANK_FIELD:
 630                         case ACPI_TYPE_LOCAL_INDEX_FIELD:
 631                         case ACPI_TYPE_DDB_HANDLE:
 632
 633                                 /* Valid operand */
 634                                 break;
 635
 636                         default:
 637
 638                                 if (acpi_gbl_enable_interpreter_slack) {
 639                                         /*
 640                                          * Enable original behavior of Store(), allowing any and all
 641                                          * objects as the source operand.  The ACPI spec does not
 642                                          * allow this, however.
 643                                          */
 644                                         break;
 645                                 }
 646
 647                                 if (target_op == AML_DEBUG_OP) {
 648
 649                                         /* Allow store of any object to the Debug object */
 650
 651                                         break;
 652                                 }
 653
 654                                 ACPI_ERROR((AE_INFO,
 655                                             "Needed Integer/Buffer/String/Package/Ref/Ddb], found [%s] %p",
 656                                             acpi_ut_get_object_type_name
 657                                             (obj_desc), obj_desc));
 658
 659                                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 660                         }
 661                         goto next_operand;
 662
 663                 default:
 664
 665                         /* Unknown type */
 666
 667                         ACPI_ERROR((AE_INFO,
 668                                     "Internal - Unknown ARGI (required operand) type %X",
 669                                     this_arg_type));
 670
 671                         return_ACPI_STATUS(AE_BAD_PARAMETER);
 672                 }
 673
 674                 /*
 675                  * Make sure that the original object was resolved to the
 676                  * required object type (Simple cases only).
 677                  */
 678                 status = acpi_ex_check_object_type(type_needed,
 679                                                    (*stack_ptr)->common.type,
 680                                                    *stack_ptr);
 681                 if (ACPI_FAILURE(status)) {
 682                         return_ACPI_STATUS(status);
 683                 }
 684
 685               next_operand:
 686                 /*
 687                  * If more operands needed, decrement stack_ptr to point
 688                  * to next operand on stack
 689                  */
 690                 if (GET_CURRENT_ARG_TYPE(arg_types)) {
 691                         stack_ptr--;
 692                 }
 693         }
 694
 695         ACPI_DUMP_OPERANDS(walk_state->operands,
 696                            acpi_ps_get_opcode_name(opcode),
 697                            walk_state->num_operands);
 698
 699         return_ACPI_STATUS(status);
 700 }