1/******************************************************************************* 2 * 3 * Module Name: dsutils - Dispatcher utilities 4 * 5 ******************************************************************************/ 6 7/* 8 * Copyright (C) 2000 - 2010, 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#include "acdispat.h" 49#include "acinterp.h" 50#include "acnamesp.h" 51#include "acdebug.h" 52 53#define _COMPONENT ACPI_DISPATCHER 54ACPI_MODULE_NAME("dsutils") 55 56/******************************************************************************* 57 * 58 * FUNCTION: acpi_ds_clear_implicit_return 59 * 60 * PARAMETERS: walk_state - Current State 61 * 62 * RETURN: None. 63 * 64 * DESCRIPTION: Clear and remove a reference on an implicit return value. Used 65 * to delete "stale" return values (if enabled, the return value 66 * from every operator is saved at least momentarily, in case the 67 * parent method exits.) 68 * 69 ******************************************************************************/ 70void acpi_ds_clear_implicit_return(struct acpi_walk_state *walk_state) 71{ 72 ACPI_FUNCTION_NAME(ds_clear_implicit_return); 73 74 /* 75 * Slack must be enabled for this feature 76 */ 77 if (!acpi_gbl_enable_interpreter_slack) { 78 return; 79 } 80 81 if (walk_state->implicit_return_obj) { 82 /* 83 * Delete any "stale" implicit return. However, in 84 * complex statements, the implicit return value can be 85 * bubbled up several levels. 86 */ 87 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 88 "Removing reference on stale implicit return obj %p\n", 89 walk_state->implicit_return_obj)); 90 91 acpi_ut_remove_reference(walk_state->implicit_return_obj); 92 walk_state->implicit_return_obj = NULL; 93 } 94} 95 96#ifndef ACPI_NO_METHOD_EXECUTION 97/******************************************************************************* 98 * 99 * FUNCTION: acpi_ds_do_implicit_return 100 * 101 * PARAMETERS: return_desc - The return value 102 * walk_state - Current State 103 * add_reference - True if a reference should be added to the 104 * return object 105 * 106 * RETURN: TRUE if implicit return enabled, FALSE otherwise 107 * 108 * DESCRIPTION: Implements the optional "implicit return". We save the result 109 * of every ASL operator and control method invocation in case the 110 * parent method exit. Before storing a new return value, we 111 * delete the previous return value. 112 * 113 ******************************************************************************/ 114 115u8 116acpi_ds_do_implicit_return(union acpi_operand_object *return_desc, 117 struct acpi_walk_state *walk_state, u8 add_reference) 118{ 119 ACPI_FUNCTION_NAME(ds_do_implicit_return); 120 121 /* 122 * Slack must be enabled for this feature, and we must 123 * have a valid return object 124 */ 125 if ((!acpi_gbl_enable_interpreter_slack) || (!return_desc)) { 126 return (FALSE); 127 } 128 129 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 130 "Result %p will be implicitly returned; Prev=%p\n", 131 return_desc, walk_state->implicit_return_obj)); 132 133 /* 134 * Delete any "stale" implicit return value first. However, in 135 * complex statements, the implicit return value can be 136 * bubbled up several levels, so we don't clear the value if it 137 * is the same as the return_desc. 138 */ 139 if (walk_state->implicit_return_obj) { 140 if (walk_state->implicit_return_obj == return_desc) { 141 return (TRUE); 142 } 143 acpi_ds_clear_implicit_return(walk_state); 144 } 145 146 /* Save the implicit return value, add a reference if requested */ 147 148 walk_state->implicit_return_obj = return_desc; 149 if (add_reference) { 150 acpi_ut_add_reference(return_desc); 151 } 152 153 return (TRUE); 154} 155 156/******************************************************************************* 157 * 158 * FUNCTION: acpi_ds_is_result_used 159 * 160 * PARAMETERS: Op - Current Op 161 * walk_state - Current State 162 * 163 * RETURN: TRUE if result is used, FALSE otherwise 164 * 165 * DESCRIPTION: Check if a result object will be used by the parent 166 * 167 ******************************************************************************/ 168 169u8 170acpi_ds_is_result_used(union acpi_parse_object * op, 171 struct acpi_walk_state * walk_state) 172{ 173 const struct acpi_opcode_info *parent_info; 174 175 ACPI_FUNCTION_TRACE_PTR(ds_is_result_used, op); 176 177 /* Must have both an Op and a Result Object */ 178 179 if (!op) { 180 ACPI_ERROR((AE_INFO, "Null Op")); 181 return_UINT8(TRUE); 182 } 183 184 /* 185 * We know that this operator is not a 186 * Return() operator (would not come here.) The following code is the 187 * optional support for a so-called "implicit return". Some AML code 188 * assumes that the last value of the method is "implicitly" returned 189 * to the caller. Just save the last result as the return value. 190 * NOTE: this is optional because the ASL language does not actually 191 * support this behavior. 192 */ 193 (void)acpi_ds_do_implicit_return(walk_state->result_obj, walk_state, 194 TRUE); 195 196 /* 197 * Now determine if the parent will use the result 198 * 199 * If there is no parent, or the parent is a scope_op, we are executing 200 * at the method level. An executing method typically has no parent, 201 * since each method is parsed separately. A method invoked externally 202 * via execute_control_method has a scope_op as the parent. 203 */ 204 if ((!op->common.parent) || 205 (op->common.parent->common.aml_opcode == AML_SCOPE_OP)) { 206 207 /* No parent, the return value cannot possibly be used */ 208 209 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 210 "At Method level, result of [%s] not used\n", 211 acpi_ps_get_opcode_name(op->common. 212 aml_opcode))); 213 return_UINT8(FALSE); 214 } 215 216 /* Get info on the parent. The root_op is AML_SCOPE */ 217 218 parent_info = 219 acpi_ps_get_opcode_info(op->common.parent->common.aml_opcode); 220 if (parent_info->class == AML_CLASS_UNKNOWN) { 221 ACPI_ERROR((AE_INFO, "Unknown parent opcode Op=%p", op)); 222 return_UINT8(FALSE); 223 } 224 225 /* 226 * Decide what to do with the result based on the parent. If 227 * the parent opcode will not use the result, delete the object. 228 * Otherwise leave it as is, it will be deleted when it is used 229 * as an operand later. 230 */ 231 switch (parent_info->class) { 232 case AML_CLASS_CONTROL: 233 234 switch (op->common.parent->common.aml_opcode) { 235 case AML_RETURN_OP: 236 237 /* Never delete the return value associated with a return opcode */ 238 239 goto result_used; 240 241 case AML_IF_OP: 242 case AML_WHILE_OP: 243 244 /* 245 * If we are executing the predicate AND this is the predicate op, 246 * we will use the return value 247 */ 248 if ((walk_state->control_state->common.state == 249 ACPI_CONTROL_PREDICATE_EXECUTING) 250 && (walk_state->control_state->control. 251 predicate_op == op)) { 252 goto result_used; 253 } 254 break; 255 256 default: 257 /* Ignore other control opcodes */ 258 break; 259 } 260 261 /* The general control opcode returns no result */ 262 263 goto result_not_used; 264 265 case AML_CLASS_CREATE: 266 267 /* 268 * These opcodes allow term_arg(s) as operands and therefore 269 * the operands can be method calls. The result is used. 270 */ 271 goto result_used; 272 273 case AML_CLASS_NAMED_OBJECT: 274 275 if ((op->common.parent->common.aml_opcode == AML_REGION_OP) || 276 (op->common.parent->common.aml_opcode == AML_DATA_REGION_OP) 277 || (op->common.parent->common.aml_opcode == AML_PACKAGE_OP) 278 || (op->common.parent->common.aml_opcode == 279 AML_VAR_PACKAGE_OP) 280 || (op->common.parent->common.aml_opcode == AML_BUFFER_OP) 281 || (op->common.parent->common.aml_opcode == 282 AML_INT_EVAL_SUBTREE_OP) 283 || (op->common.parent->common.aml_opcode == 284 AML_BANK_FIELD_OP)) { 285 /* 286 * These opcodes allow term_arg(s) as operands and therefore 287 * the operands can be method calls. The result is used. 288 */ 289 goto result_used; 290 } 291 292 goto result_not_used; 293 294 default: 295 296 /* 297 * In all other cases. the parent will actually use the return 298 * object, so keep it. 299 */ 300 goto result_used; 301 } 302 303 result_used: 304 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 305 "Result of [%s] used by Parent [%s] Op=%p\n", 306 acpi_ps_get_opcode_name(op->common.aml_opcode), 307 acpi_ps_get_opcode_name(op->common.parent->common. 308 aml_opcode), op)); 309 310 return_UINT8(TRUE); 311 312 result_not_used: 313 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 314 "Result of [%s] not used by Parent [%s] Op=%p\n", 315 acpi_ps_get_opcode_name(op->common.aml_opcode), 316 acpi_ps_get_opcode_name(op->common.parent->common. 317 aml_opcode), op)); 318 319 return_UINT8(FALSE); 320} 321 322/******************************************************************************* 323 * 324 * FUNCTION: acpi_ds_delete_result_if_not_used 325 * 326 * PARAMETERS: Op - Current parse Op 327 * result_obj - Result of the operation 328 * walk_state - Current state 329 * 330 * RETURN: Status 331 * 332 * DESCRIPTION: Used after interpretation of an opcode. If there is an internal 333 * result descriptor, check if the parent opcode will actually use 334 * this result. If not, delete the result now so that it will 335 * not become orphaned. 336 * 337 ******************************************************************************/ 338 339void 340acpi_ds_delete_result_if_not_used(union acpi_parse_object *op, 341 union acpi_operand_object *result_obj, 342 struct acpi_walk_state *walk_state) 343{ 344 union acpi_operand_object *obj_desc; 345 acpi_status status; 346 347 ACPI_FUNCTION_TRACE_PTR(ds_delete_result_if_not_used, result_obj); 348 349 if (!op) { 350 ACPI_ERROR((AE_INFO, "Null Op")); 351 return_VOID; 352 } 353 354 if (!result_obj) { 355 return_VOID; 356 } 357 358 if (!acpi_ds_is_result_used(op, walk_state)) { 359 360 /* Must pop the result stack (obj_desc should be equal to result_obj) */ 361 362 status = acpi_ds_result_pop(&obj_desc, walk_state); 363 if (ACPI_SUCCESS(status)) { 364 acpi_ut_remove_reference(result_obj); 365 } 366 } 367 368 return_VOID; 369} 370 371/******************************************************************************* 372 * 373 * FUNCTION: acpi_ds_resolve_operands 374 * 375 * PARAMETERS: walk_state - Current walk state with operands on stack 376 * 377 * RETURN: Status 378 * 379 * DESCRIPTION: Resolve all operands to their values. Used to prepare 380 * arguments to a control method invocation (a call from one 381 * method to another.) 382 * 383 ******************************************************************************/ 384 385acpi_status acpi_ds_resolve_operands(struct acpi_walk_state *walk_state) 386{ 387 u32 i; 388 acpi_status status = AE_OK; 389 390 ACPI_FUNCTION_TRACE_PTR(ds_resolve_operands, walk_state); 391 392 /* 393 * Attempt to resolve each of the valid operands 394 * Method arguments are passed by reference, not by value. This means 395 * that the actual objects are passed, not copies of the objects. 396 */ 397 for (i = 0; i < walk_state->num_operands; i++) { 398 status = 399 acpi_ex_resolve_to_value(&walk_state->operands[i], 400 walk_state); 401 if (ACPI_FAILURE(status)) { 402 break; 403 } 404 } 405 406 return_ACPI_STATUS(status); 407} 408 409/******************************************************************************* 410 * 411 * FUNCTION: acpi_ds_clear_operands 412 * 413 * PARAMETERS: walk_state - Current walk state with operands on stack 414 * 415 * RETURN: None 416 * 417 * DESCRIPTION: Clear all operands on the current walk state operand stack. 418 * 419 ******************************************************************************/ 420 421void acpi_ds_clear_operands(struct acpi_walk_state *walk_state) 422{ 423 u32 i; 424 425 ACPI_FUNCTION_TRACE_PTR(ds_clear_operands, walk_state); 426 427 /* Remove a reference on each operand on the stack */ 428 429 for (i = 0; i < walk_state->num_operands; i++) { 430 /* 431 * Remove a reference to all operands, including both 432 * "Arguments" and "Targets". 433 */ 434 acpi_ut_remove_reference(walk_state->operands[i]); 435 walk_state->operands[i] = NULL; 436 } 437 438 walk_state->num_operands = 0; 439 return_VOID; 440} 441#endif 442 443/******************************************************************************* 444 * 445 * FUNCTION: acpi_ds_create_operand 446 * 447 * PARAMETERS: walk_state - Current walk state 448 * Arg - Parse object for the argument 449 * arg_index - Which argument (zero based) 450 * 451 * RETURN: Status 452 * 453 * DESCRIPTION: Translate a parse tree object that is an argument to an AML 454 * opcode to the equivalent interpreter object. This may include 455 * looking up a name or entering a new name into the internal 456 * namespace. 457 * 458 ******************************************************************************/ 459 460acpi_status 461acpi_ds_create_operand(struct acpi_walk_state *walk_state, 462 union acpi_parse_object *arg, u32 arg_index) 463{ 464 acpi_status status = AE_OK; 465 char *name_string; 466 u32 name_length; 467 union acpi_operand_object *obj_desc; 468 union acpi_parse_object *parent_op; 469 u16 opcode; 470 acpi_interpreter_mode interpreter_mode; 471 const struct acpi_opcode_info *op_info; 472 473 ACPI_FUNCTION_TRACE_PTR(ds_create_operand, arg); 474 475 /* A valid name must be looked up in the namespace */ 476 477 if ((arg->common.aml_opcode == AML_INT_NAMEPATH_OP) && 478 (arg->common.value.string) && 479 !(arg->common.flags & ACPI_PARSEOP_IN_STACK)) { 480 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Getting a name: Arg=%p\n", 481 arg)); 482 483 /* Get the entire name string from the AML stream */ 484 485 status = 486 acpi_ex_get_name_string(ACPI_TYPE_ANY, 487 arg->common.value.buffer, 488 &name_string, &name_length); 489 490 if (ACPI_FAILURE(status)) { 491 return_ACPI_STATUS(status); 492 } 493 494 /* All prefixes have been handled, and the name is in name_string */ 495 496 /* 497 * Special handling for buffer_field declarations. This is a deferred 498 * opcode that unfortunately defines the field name as the last 499 * parameter instead of the first. We get here when we are performing 500 * the deferred execution, so the actual name of the field is already 501 * in the namespace. We don't want to attempt to look it up again 502 * because we may be executing in a different scope than where the 503 * actual opcode exists. 504 */ 505 if ((walk_state->deferred_node) && 506 (walk_state->deferred_node->type == ACPI_TYPE_BUFFER_FIELD) 507 && (arg_index == 508 (u32) ((walk_state->opcode == 509 AML_CREATE_FIELD_OP) ? 3 : 2))) { 510 obj_desc = 511 ACPI_CAST_PTR(union acpi_operand_object, 512 walk_state->deferred_node); 513 status = AE_OK; 514 } else { /* All other opcodes */ 515 516 /* 517 * Differentiate between a namespace "create" operation 518 * versus a "lookup" operation (IMODE_LOAD_PASS2 vs. 519 * IMODE_EXECUTE) in order to support the creation of 520 * namespace objects during the execution of control methods. 521 */ 522 parent_op = arg->common.parent; 523 op_info = 524 acpi_ps_get_opcode_info(parent_op->common. 525 aml_opcode); 526 if ((op_info->flags & AML_NSNODE) 527 && (parent_op->common.aml_opcode != 528 AML_INT_METHODCALL_OP) 529 && (parent_op->common.aml_opcode != AML_REGION_OP) 530 && (parent_op->common.aml_opcode != 531 AML_INT_NAMEPATH_OP)) { 532 533 /* Enter name into namespace if not found */ 534 535 interpreter_mode = ACPI_IMODE_LOAD_PASS2; 536 } else { 537 /* Return a failure if name not found */ 538 539 interpreter_mode = ACPI_IMODE_EXECUTE; 540 } 541 542 status = 543 acpi_ns_lookup(walk_state->scope_info, name_string, 544 ACPI_TYPE_ANY, interpreter_mode, 545 ACPI_NS_SEARCH_PARENT | 546 ACPI_NS_DONT_OPEN_SCOPE, walk_state, 547 ACPI_CAST_INDIRECT_PTR(struct 548 acpi_namespace_node, 549 &obj_desc)); 550 /* 551 * The only case where we pass through (ignore) a NOT_FOUND 552 * error is for the cond_ref_of opcode. 553 */ 554 if (status == AE_NOT_FOUND) { 555 if (parent_op->common.aml_opcode == 556 AML_COND_REF_OF_OP) { 557 /* 558 * For the Conditional Reference op, it's OK if 559 * the name is not found; We just need a way to 560 * indicate this to the interpreter, set the 561 * object to the root 562 */ 563 obj_desc = ACPI_CAST_PTR(union 564 acpi_operand_object, 565 acpi_gbl_root_node); 566 status = AE_OK; 567 } else { 568 /* 569 * We just plain didn't find it -- which is a 570 * very serious error at this point 571 */ 572 status = AE_AML_NAME_NOT_FOUND; 573 } 574 } 575 576 if (ACPI_FAILURE(status)) { 577 ACPI_ERROR_NAMESPACE(name_string, status); 578 } 579 } 580 581 /* Free the namestring created above */ 582 583 ACPI_FREE(name_string); 584 585 /* Check status from the lookup */ 586 587 if (ACPI_FAILURE(status)) { 588 return_ACPI_STATUS(status); 589 } 590 591 /* Put the resulting object onto the current object stack */ 592 593 status = acpi_ds_obj_stack_push(obj_desc, walk_state); 594 if (ACPI_FAILURE(status)) { 595 return_ACPI_STATUS(status); 596 } 597 ACPI_DEBUGGER_EXEC(acpi_db_display_argument_object 598 (obj_desc, walk_state)); 599 } else { 600 /* Check for null name case */ 601 602 if ((arg->common.aml_opcode == AML_INT_NAMEPATH_OP) && 603 !(arg->common.flags & ACPI_PARSEOP_IN_STACK)) { 604 /* 605 * If the name is null, this means that this is an 606 * optional result parameter that was not specified 607 * in the original ASL. Create a Zero Constant for a 608 * placeholder. (Store to a constant is a Noop.) 609 */ 610 opcode = AML_ZERO_OP; /* Has no arguments! */ 611 612 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 613 "Null namepath: Arg=%p\n", arg)); 614 } else { 615 opcode = arg->common.aml_opcode; 616 } 617 618 /* Get the object type of the argument */ 619 620 op_info = acpi_ps_get_opcode_info(opcode); 621 if (op_info->object_type == ACPI_TYPE_INVALID) { 622 return_ACPI_STATUS(AE_NOT_IMPLEMENTED); 623 } 624 625 if ((op_info->flags & AML_HAS_RETVAL) 626 || (arg->common.flags & ACPI_PARSEOP_IN_STACK)) { 627 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 628 "Argument previously created, already stacked\n")); 629 630 ACPI_DEBUGGER_EXEC(acpi_db_display_argument_object 631 (walk_state-> 632 operands[walk_state->num_operands - 633 1], walk_state)); 634 635 /* 636 * Use value that was already previously returned 637 * by the evaluation of this argument 638 */ 639 status = acpi_ds_result_pop(&obj_desc, walk_state); 640 if (ACPI_FAILURE(status)) { 641 /* 642 * Only error is underflow, and this indicates 643 * a missing or null operand! 644 */ 645 ACPI_EXCEPTION((AE_INFO, status, 646 "Missing or null operand")); 647 return_ACPI_STATUS(status); 648 } 649 } else { 650 /* Create an ACPI_INTERNAL_OBJECT for the argument */ 651 652 obj_desc = 653 acpi_ut_create_internal_object(op_info-> 654 object_type); 655 if (!obj_desc) { 656 return_ACPI_STATUS(AE_NO_MEMORY); 657 } 658 659 /* Initialize the new object */ 660 661 status = 662 acpi_ds_init_object_from_op(walk_state, arg, opcode, 663 &obj_desc); 664 if (ACPI_FAILURE(status)) { 665 acpi_ut_delete_object_desc(obj_desc); 666 return_ACPI_STATUS(status); 667 } 668 } 669 670 /* Put the operand object on the object stack */ 671 672 status = acpi_ds_obj_stack_push(obj_desc, walk_state); 673 if (ACPI_FAILURE(status)) { 674 return_ACPI_STATUS(status); 675 } 676 677 ACPI_DEBUGGER_EXEC(acpi_db_display_argument_object 678 (obj_desc, walk_state)); 679 } 680 681 return_ACPI_STATUS(AE_OK); 682} 683 684/******************************************************************************* 685 * 686 * FUNCTION: acpi_ds_create_operands 687 * 688 * PARAMETERS: walk_state - Current state 689 * first_arg - First argument of a parser argument tree 690 * 691 * RETURN: Status 692 * 693 * DESCRIPTION: Convert an operator's arguments from a parse tree format to 694 * namespace objects and place those argument object on the object 695 * stack in preparation for evaluation by the interpreter. 696 * 697 ******************************************************************************/ 698 699acpi_status 700acpi_ds_create_operands(struct acpi_walk_state *walk_state, 701 union acpi_parse_object *first_arg) 702{ 703 acpi_status status = AE_OK; 704 union acpi_parse_object *arg; 705 union acpi_parse_object *arguments[ACPI_OBJ_NUM_OPERANDS]; 706 u32 arg_count = 0; 707 u32 index = walk_state->num_operands; 708 u32 i; 709 710 ACPI_FUNCTION_TRACE_PTR(ds_create_operands, first_arg); 711 712 /* Get all arguments in the list */ 713 714 arg = first_arg; 715 while (arg) { 716 if (index >= ACPI_OBJ_NUM_OPERANDS) { 717 return_ACPI_STATUS(AE_BAD_DATA); 718 } 719 720 arguments[index] = arg; 721 walk_state->operands[index] = NULL; 722 723 /* Move on to next argument, if any */ 724 725 arg = arg->common.next; 726 arg_count++; 727 index++; 728 } 729 730 index--; 731 732 /* It is the appropriate order to get objects from the Result stack */ 733 734 for (i = 0; i < arg_count; i++) { 735 arg = arguments[index]; 736 737 /* Force the filling of the operand stack in inverse order */ 738 739 walk_state->operand_index = (u8) index; 740 741 status = acpi_ds_create_operand(walk_state, arg, index); 742 if (ACPI_FAILURE(status)) { 743 goto cleanup; 744 } 745 746 index--; 747 748 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 749 "Arg #%u (%p) done, Arg1=%p\n", index, arg, 750 first_arg)); 751 } 752 753 return_ACPI_STATUS(status); 754 755 cleanup: 756 /* 757 * We must undo everything done above; meaning that we must 758 * pop everything off of the operand stack and delete those 759 * objects 760 */ 761 acpi_ds_obj_stack_pop_and_delete(arg_count, walk_state); 762 763 ACPI_EXCEPTION((AE_INFO, status, "While creating Arg %u", index)); 764 return_ACPI_STATUS(status); 765} 766 767/***************************************************************************** 768 * 769 * FUNCTION: acpi_ds_evaluate_name_path 770 * 771 * PARAMETERS: walk_state - Current state of the parse tree walk, 772 * the opcode of current operation should be 773 * AML_INT_NAMEPATH_OP 774 * 775 * RETURN: Status 776 * 777 * DESCRIPTION: Translate the -name_path- parse tree object to the equivalent 778 * interpreter object, convert it to value, if needed, duplicate 779 * it, if needed, and push it onto the current result stack. 780 * 781 ****************************************************************************/ 782 783acpi_status acpi_ds_evaluate_name_path(struct acpi_walk_state *walk_state) 784{ 785 acpi_status status = AE_OK; 786 union acpi_parse_object *op = walk_state->op; 787 union acpi_operand_object **operand = &walk_state->operands[0]; 788 union acpi_operand_object *new_obj_desc; 789 u8 type; 790 791 ACPI_FUNCTION_TRACE_PTR(ds_evaluate_name_path, walk_state); 792 793 if (!op->common.parent) { 794 795 /* This happens after certain exception processing */ 796 797 goto exit; 798 } 799 800 if ((op->common.parent->common.aml_opcode == AML_PACKAGE_OP) || 801 (op->common.parent->common.aml_opcode == AML_VAR_PACKAGE_OP) || 802 (op->common.parent->common.aml_opcode == AML_REF_OF_OP)) { 803 804 /* TBD: Should we specify this feature as a bit of op_info->Flags of these opcodes? */ 805 806 goto exit; 807 } 808 809 status = acpi_ds_create_operand(walk_state, op, 0); 810 if (ACPI_FAILURE(status)) { 811 goto exit; 812 } 813 814 if (op->common.flags & ACPI_PARSEOP_TARGET) { 815 new_obj_desc = *operand; 816 goto push_result; 817 } 818 819 type = (*operand)->common.type; 820 821 status = acpi_ex_resolve_to_value(operand, walk_state); 822 if (ACPI_FAILURE(status)) { 823 goto exit; 824 } 825 826 if (type == ACPI_TYPE_INTEGER) { 827 828 /* It was incremented by acpi_ex_resolve_to_value */ 829 830 acpi_ut_remove_reference(*operand); 831 832 status = 833 acpi_ut_copy_iobject_to_iobject(*operand, &new_obj_desc, 834 walk_state); 835 if (ACPI_FAILURE(status)) { 836 goto exit; 837 } 838 } else { 839 /* 840 * The object either was anew created or is 841 * a Namespace node - don't decrement it. 842 */ 843 new_obj_desc = *operand; 844 } 845 846 /* Cleanup for name-path operand */ 847 848 status = acpi_ds_obj_stack_pop(1, walk_state); 849 if (ACPI_FAILURE(status)) { 850 walk_state->result_obj = new_obj_desc; 851 goto exit; 852 } 853 854 push_result: 855 856 walk_state->result_obj = new_obj_desc; 857 858 status = acpi_ds_result_push(walk_state->result_obj, walk_state); 859 if (ACPI_SUCCESS(status)) { 860 861 /* Force to take it from stack */ 862 863 op->common.flags |= ACPI_PARSEOP_IN_STACK; 864 } 865 866 exit: 867 868 return_ACPI_STATUS(status); 869} 870