1/******************************************************************************* 2 * 3 * Module Name: dsutils - Dispatcher utilities 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#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 * If we are executing the predicate AND this is the predicate op, 245 * we will use the return value 246 */ 247 if ((walk_state->control_state->common.state == 248 ACPI_CONTROL_PREDICATE_EXECUTING) 249 && (walk_state->control_state->control. 250 predicate_op == op)) { 251 goto result_used; 252 } 253 break; 254 255 default: 256 257 /* Ignore other control opcodes */ 258 259 break; 260 } 261 262 /* The general control opcode returns no result */ 263 264 goto result_not_used; 265 266 case AML_CLASS_CREATE: 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 * In all other cases. the parent will actually use the return 297 * object, so keep it. 298 */ 299 goto result_used; 300 } 301 302result_used: 303 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 304 "Result of [%s] used by Parent [%s] Op=%p\n", 305 acpi_ps_get_opcode_name(op->common.aml_opcode), 306 acpi_ps_get_opcode_name(op->common.parent->common. 307 aml_opcode), op)); 308 309 return_UINT8(TRUE); 310 311result_not_used: 312 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 313 "Result of [%s] not used by Parent [%s] Op=%p\n", 314 acpi_ps_get_opcode_name(op->common.aml_opcode), 315 acpi_ps_get_opcode_name(op->common.parent->common. 316 aml_opcode), op)); 317 318 return_UINT8(FALSE); 319} 320 321/******************************************************************************* 322 * 323 * FUNCTION: acpi_ds_delete_result_if_not_used 324 * 325 * PARAMETERS: op - Current parse Op 326 * result_obj - Result of the operation 327 * walk_state - Current state 328 * 329 * RETURN: Status 330 * 331 * DESCRIPTION: Used after interpretation of an opcode. If there is an internal 332 * result descriptor, check if the parent opcode will actually use 333 * this result. If not, delete the result now so that it will 334 * not become orphaned. 335 * 336 ******************************************************************************/ 337 338void 339acpi_ds_delete_result_if_not_used(union acpi_parse_object *op, 340 union acpi_operand_object *result_obj, 341 struct acpi_walk_state *walk_state) 342{ 343 union acpi_operand_object *obj_desc; 344 acpi_status status; 345 346 ACPI_FUNCTION_TRACE_PTR(ds_delete_result_if_not_used, result_obj); 347 348 if (!op) { 349 ACPI_ERROR((AE_INFO, "Null Op")); 350 return_VOID; 351 } 352 353 if (!result_obj) { 354 return_VOID; 355 } 356 357 if (!acpi_ds_is_result_used(op, walk_state)) { 358 359 /* Must pop the result stack (obj_desc should be equal to result_obj) */ 360 361 status = acpi_ds_result_pop(&obj_desc, walk_state); 362 if (ACPI_SUCCESS(status)) { 363 acpi_ut_remove_reference(result_obj); 364 } 365 } 366 367 return_VOID; 368} 369 370/******************************************************************************* 371 * 372 * FUNCTION: acpi_ds_resolve_operands 373 * 374 * PARAMETERS: walk_state - Current walk state with operands on stack 375 * 376 * RETURN: Status 377 * 378 * DESCRIPTION: Resolve all operands to their values. Used to prepare 379 * arguments to a control method invocation (a call from one 380 * method to another.) 381 * 382 ******************************************************************************/ 383 384acpi_status acpi_ds_resolve_operands(struct acpi_walk_state *walk_state) 385{ 386 u32 i; 387 acpi_status status = AE_OK; 388 389 ACPI_FUNCTION_TRACE_PTR(ds_resolve_operands, walk_state); 390 391 /* 392 * Attempt to resolve each of the valid operands 393 * Method arguments are passed by reference, not by value. This means 394 * that the actual objects are passed, not copies of the objects. 395 */ 396 for (i = 0; i < walk_state->num_operands; i++) { 397 status = 398 acpi_ex_resolve_to_value(&walk_state->operands[i], 399 walk_state); 400 if (ACPI_FAILURE(status)) { 401 break; 402 } 403 } 404 405 return_ACPI_STATUS(status); 406} 407 408/******************************************************************************* 409 * 410 * FUNCTION: acpi_ds_clear_operands 411 * 412 * PARAMETERS: walk_state - Current walk state with operands on stack 413 * 414 * RETURN: None 415 * 416 * DESCRIPTION: Clear all operands on the current walk state operand stack. 417 * 418 ******************************************************************************/ 419 420void acpi_ds_clear_operands(struct acpi_walk_state *walk_state) 421{ 422 u32 i; 423 424 ACPI_FUNCTION_TRACE_PTR(ds_clear_operands, walk_state); 425 426 /* Remove a reference on each operand on the stack */ 427 428 for (i = 0; i < walk_state->num_operands; i++) { 429 /* 430 * Remove a reference to all operands, including both 431 * "Arguments" and "Targets". 432 */ 433 acpi_ut_remove_reference(walk_state->operands[i]); 434 walk_state->operands[i] = NULL; 435 } 436 437 walk_state->num_operands = 0; 438 return_VOID; 439} 440#endif 441 442/******************************************************************************* 443 * 444 * FUNCTION: acpi_ds_create_operand 445 * 446 * PARAMETERS: walk_state - Current walk state 447 * arg - Parse object for the argument 448 * arg_index - Which argument (zero based) 449 * 450 * RETURN: Status 451 * 452 * DESCRIPTION: Translate a parse tree object that is an argument to an AML 453 * opcode to the equivalent interpreter object. This may include 454 * looking up a name or entering a new name into the internal 455 * namespace. 456 * 457 ******************************************************************************/ 458 459acpi_status 460acpi_ds_create_operand(struct acpi_walk_state *walk_state, 461 union acpi_parse_object *arg, u32 arg_index) 462{ 463 acpi_status status = AE_OK; 464 char *name_string; 465 u32 name_length; 466 union acpi_operand_object *obj_desc; 467 union acpi_parse_object *parent_op; 468 u16 opcode; 469 acpi_interpreter_mode interpreter_mode; 470 const struct acpi_opcode_info *op_info; 471 472 ACPI_FUNCTION_TRACE_PTR(ds_create_operand, arg); 473 474 /* A valid name must be looked up in the namespace */ 475 476 if ((arg->common.aml_opcode == AML_INT_NAMEPATH_OP) && 477 (arg->common.value.string) && 478 !(arg->common.flags & ACPI_PARSEOP_IN_STACK)) { 479 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Getting a name: Arg=%p\n", 480 arg)); 481 482 /* Get the entire name string from the AML stream */ 483 484 status = 485 acpi_ex_get_name_string(ACPI_TYPE_ANY, 486 arg->common.value.buffer, 487 &name_string, &name_length); 488 489 if (ACPI_FAILURE(status)) { 490 return_ACPI_STATUS(status); 491 } 492 493 /* All prefixes have been handled, and the name is in name_string */ 494 495 /* 496 * Special handling for buffer_field declarations. This is a deferred 497 * opcode that unfortunately defines the field name as the last 498 * parameter instead of the first. We get here when we are performing 499 * the deferred execution, so the actual name of the field is already 500 * in the namespace. We don't want to attempt to look it up again 501 * because we may be executing in a different scope than where the 502 * actual opcode exists. 503 */ 504 if ((walk_state->deferred_node) && 505 (walk_state->deferred_node->type == ACPI_TYPE_BUFFER_FIELD) 506 && (arg_index == 507 (u32) ((walk_state->opcode == 508 AML_CREATE_FIELD_OP) ? 3 : 2))) { 509 obj_desc = 510 ACPI_CAST_PTR(union acpi_operand_object, 511 walk_state->deferred_node); 512 status = AE_OK; 513 } else { /* All other opcodes */ 514 515 /* 516 * Differentiate between a namespace "create" operation 517 * versus a "lookup" operation (IMODE_LOAD_PASS2 vs. 518 * IMODE_EXECUTE) in order to support the creation of 519 * namespace objects during the execution of control methods. 520 */ 521 parent_op = arg->common.parent; 522 op_info = 523 acpi_ps_get_opcode_info(parent_op->common. 524 aml_opcode); 525 if ((op_info->flags & AML_NSNODE) 526 && (parent_op->common.aml_opcode != 527 AML_INT_METHODCALL_OP) 528 && (parent_op->common.aml_opcode != AML_REGION_OP) 529 && (parent_op->common.aml_opcode != 530 AML_INT_NAMEPATH_OP)) { 531 532 /* Enter name into namespace if not found */ 533 534 interpreter_mode = ACPI_IMODE_LOAD_PASS2; 535 } else { 536 /* Return a failure if name not found */ 537 538 interpreter_mode = ACPI_IMODE_EXECUTE; 539 } 540 541 status = 542 acpi_ns_lookup(walk_state->scope_info, name_string, 543 ACPI_TYPE_ANY, interpreter_mode, 544 ACPI_NS_SEARCH_PARENT | 545 ACPI_NS_DONT_OPEN_SCOPE, walk_state, 546 ACPI_CAST_INDIRECT_PTR(struct 547 acpi_namespace_node, 548 &obj_desc)); 549 /* 550 * The only case where we pass through (ignore) a NOT_FOUND 551 * error is for the cond_ref_of opcode. 552 */ 553 if (status == AE_NOT_FOUND) { 554 if (parent_op->common.aml_opcode == 555 AML_COND_REF_OF_OP) { 556 /* 557 * For the Conditional Reference op, it's OK if 558 * the name is not found; We just need a way to 559 * indicate this to the interpreter, set the 560 * object to the root 561 */ 562 obj_desc = 563 ACPI_CAST_PTR(union 564 acpi_operand_object, 565 acpi_gbl_root_node); 566 status = AE_OK; 567 } else if (parent_op->common.aml_opcode == 568 AML_EXTERNAL_OP) { 569 570 /* TBD: May only be temporary */ 571 572 obj_desc = 573 acpi_ut_create_string_object((acpi_size) name_length); 574 575 ACPI_STRNCPY(obj_desc->string.pointer, 576 name_string, name_length); 577 status = AE_OK; 578 } else { 579 /* 580 * We just plain didn't find it -- which is a 581 * very serious error at this point 582 */ 583 status = AE_AML_NAME_NOT_FOUND; 584 } 585 } 586 587 if (ACPI_FAILURE(status)) { 588 ACPI_ERROR_NAMESPACE(name_string, status); 589 } 590 } 591 592 /* Free the namestring created above */ 593 594 ACPI_FREE(name_string); 595 596 /* Check status from the lookup */ 597 598 if (ACPI_FAILURE(status)) { 599 return_ACPI_STATUS(status); 600 } 601 602 /* Put the resulting object onto the current object stack */ 603 604 status = acpi_ds_obj_stack_push(obj_desc, walk_state); 605 if (ACPI_FAILURE(status)) { 606 return_ACPI_STATUS(status); 607 } 608 ACPI_DEBUGGER_EXEC(acpi_db_display_argument_object 609 (obj_desc, walk_state)); 610 } else { 611 /* Check for null name case */ 612 613 if ((arg->common.aml_opcode == AML_INT_NAMEPATH_OP) && 614 !(arg->common.flags & ACPI_PARSEOP_IN_STACK)) { 615 /* 616 * If the name is null, this means that this is an 617 * optional result parameter that was not specified 618 * in the original ASL. Create a Zero Constant for a 619 * placeholder. (Store to a constant is a Noop.) 620 */ 621 opcode = AML_ZERO_OP; /* Has no arguments! */ 622 623 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 624 "Null namepath: Arg=%p\n", arg)); 625 } else { 626 opcode = arg->common.aml_opcode; 627 } 628 629 /* Get the object type of the argument */ 630 631 op_info = acpi_ps_get_opcode_info(opcode); 632 if (op_info->object_type == ACPI_TYPE_INVALID) { 633 return_ACPI_STATUS(AE_NOT_IMPLEMENTED); 634 } 635 636 if ((op_info->flags & AML_HAS_RETVAL) 637 || (arg->common.flags & ACPI_PARSEOP_IN_STACK)) { 638 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 639 "Argument previously created, already stacked\n")); 640 641 ACPI_DEBUGGER_EXEC(acpi_db_display_argument_object 642 (walk_state-> 643 operands[walk_state->num_operands - 644 1], walk_state)); 645 646 /* 647 * Use value that was already previously returned 648 * by the evaluation of this argument 649 */ 650 status = acpi_ds_result_pop(&obj_desc, walk_state); 651 if (ACPI_FAILURE(status)) { 652 /* 653 * Only error is underflow, and this indicates 654 * a missing or null operand! 655 */ 656 ACPI_EXCEPTION((AE_INFO, status, 657 "Missing or null operand")); 658 return_ACPI_STATUS(status); 659 } 660 } else { 661 /* Create an ACPI_INTERNAL_OBJECT for the argument */ 662 663 obj_desc = 664 acpi_ut_create_internal_object(op_info-> 665 object_type); 666 if (!obj_desc) { 667 return_ACPI_STATUS(AE_NO_MEMORY); 668 } 669 670 /* Initialize the new object */ 671 672 status = 673 acpi_ds_init_object_from_op(walk_state, arg, opcode, 674 &obj_desc); 675 if (ACPI_FAILURE(status)) { 676 acpi_ut_delete_object_desc(obj_desc); 677 return_ACPI_STATUS(status); 678 } 679 } 680 681 /* Put the operand object on the object stack */ 682 683 status = acpi_ds_obj_stack_push(obj_desc, walk_state); 684 if (ACPI_FAILURE(status)) { 685 return_ACPI_STATUS(status); 686 } 687 688 ACPI_DEBUGGER_EXEC(acpi_db_display_argument_object 689 (obj_desc, walk_state)); 690 } 691 692 return_ACPI_STATUS(AE_OK); 693} 694 695/******************************************************************************* 696 * 697 * FUNCTION: acpi_ds_create_operands 698 * 699 * PARAMETERS: walk_state - Current state 700 * first_arg - First argument of a parser argument tree 701 * 702 * RETURN: Status 703 * 704 * DESCRIPTION: Convert an operator's arguments from a parse tree format to 705 * namespace objects and place those argument object on the object 706 * stack in preparation for evaluation by the interpreter. 707 * 708 ******************************************************************************/ 709 710acpi_status 711acpi_ds_create_operands(struct acpi_walk_state *walk_state, 712 union acpi_parse_object *first_arg) 713{ 714 acpi_status status = AE_OK; 715 union acpi_parse_object *arg; 716 union acpi_parse_object *arguments[ACPI_OBJ_NUM_OPERANDS]; 717 u32 arg_count = 0; 718 u32 index = walk_state->num_operands; 719 u32 i; 720 721 ACPI_FUNCTION_TRACE_PTR(ds_create_operands, first_arg); 722 723 /* Get all arguments in the list */ 724 725 arg = first_arg; 726 while (arg) { 727 if (index >= ACPI_OBJ_NUM_OPERANDS) { 728 return_ACPI_STATUS(AE_BAD_DATA); 729 } 730 731 arguments[index] = arg; 732 walk_state->operands[index] = NULL; 733 734 /* Move on to next argument, if any */ 735 736 arg = arg->common.next; 737 arg_count++; 738 index++; 739 } 740 741 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 742 "NumOperands %d, ArgCount %d, Index %d\n", 743 walk_state->num_operands, arg_count, index)); 744 745 /* Create the interpreter arguments, in reverse order */ 746 747 index--; 748 for (i = 0; i < arg_count; i++) { 749 arg = arguments[index]; 750 walk_state->operand_index = (u8)index; 751 752 status = acpi_ds_create_operand(walk_state, arg, index); 753 if (ACPI_FAILURE(status)) { 754 goto cleanup; 755 } 756 757 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 758 "Created Arg #%u (%p) %u args total\n", 759 index, arg, arg_count)); 760 index--; 761 } 762 763 return_ACPI_STATUS(status); 764 765cleanup: 766 /* 767 * We must undo everything done above; meaning that we must 768 * pop everything off of the operand stack and delete those 769 * objects 770 */ 771 acpi_ds_obj_stack_pop_and_delete(arg_count, walk_state); 772 773 ACPI_EXCEPTION((AE_INFO, status, "While creating Arg %u", index)); 774 return_ACPI_STATUS(status); 775} 776 777/***************************************************************************** 778 * 779 * FUNCTION: acpi_ds_evaluate_name_path 780 * 781 * PARAMETERS: walk_state - Current state of the parse tree walk, 782 * the opcode of current operation should be 783 * AML_INT_NAMEPATH_OP 784 * 785 * RETURN: Status 786 * 787 * DESCRIPTION: Translate the -name_path- parse tree object to the equivalent 788 * interpreter object, convert it to value, if needed, duplicate 789 * it, if needed, and push it onto the current result stack. 790 * 791 ****************************************************************************/ 792 793acpi_status acpi_ds_evaluate_name_path(struct acpi_walk_state *walk_state) 794{ 795 acpi_status status = AE_OK; 796 union acpi_parse_object *op = walk_state->op; 797 union acpi_operand_object **operand = &walk_state->operands[0]; 798 union acpi_operand_object *new_obj_desc; 799 u8 type; 800 801 ACPI_FUNCTION_TRACE_PTR(ds_evaluate_name_path, walk_state); 802 803 if (!op->common.parent) { 804 805 /* This happens after certain exception processing */ 806 807 goto exit; 808 } 809 810 if ((op->common.parent->common.aml_opcode == AML_PACKAGE_OP) || 811 (op->common.parent->common.aml_opcode == AML_VAR_PACKAGE_OP) || 812 (op->common.parent->common.aml_opcode == AML_REF_OF_OP)) { 813 814 /* TBD: Should we specify this feature as a bit of op_info->Flags of these opcodes? */ 815 816 goto exit; 817 } 818 819 status = acpi_ds_create_operand(walk_state, op, 0); 820 if (ACPI_FAILURE(status)) { 821 goto exit; 822 } 823 824 if (op->common.flags & ACPI_PARSEOP_TARGET) { 825 new_obj_desc = *operand; 826 goto push_result; 827 } 828 829 type = (*operand)->common.type; 830 831 status = acpi_ex_resolve_to_value(operand, walk_state); 832 if (ACPI_FAILURE(status)) { 833 goto exit; 834 } 835 836 if (type == ACPI_TYPE_INTEGER) { 837 838 /* It was incremented by acpi_ex_resolve_to_value */ 839 840 acpi_ut_remove_reference(*operand); 841 842 status = 843 acpi_ut_copy_iobject_to_iobject(*operand, &new_obj_desc, 844 walk_state); 845 if (ACPI_FAILURE(status)) { 846 goto exit; 847 } 848 } else { 849 /* 850 * The object either was anew created or is 851 * a Namespace node - don't decrement it. 852 */ 853 new_obj_desc = *operand; 854 } 855 856 /* Cleanup for name-path operand */ 857 858 status = acpi_ds_obj_stack_pop(1, walk_state); 859 if (ACPI_FAILURE(status)) { 860 walk_state->result_obj = new_obj_desc; 861 goto exit; 862 } 863 864push_result: 865 866 walk_state->result_obj = new_obj_desc; 867 868 status = acpi_ds_result_push(walk_state->result_obj, walk_state); 869 if (ACPI_SUCCESS(status)) { 870 871 /* Force to take it from stack */ 872 873 op->common.flags |= ACPI_PARSEOP_IN_STACK; 874 } 875 876exit: 877 878 return_ACPI_STATUS(status); 879} 880