1 2/****************************************************************************** 3 * 4 * Module Name: exresop - AML Interpreter operand/object resolution 5 * 6 *****************************************************************************/ 7 8/* 9 * Copyright (C) 2000 - 2010, 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 53ACPI_MODULE_NAME("exresop") 54 55/* Local prototypes */ 56static acpi_status 57acpi_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 74static acpi_status 75acpi_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 133acpi_status 134acpi_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 0x%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 [0x%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 0x%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 0x%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} 701