1 /****************************************************************************** 2 * 3 * Module Name: exresop - AML Interpreter operand/object resolution 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2013, 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 "amlcode.h" 47 #include "acparser.h" 48 #include "acinterp.h" 49 #include "acnamesp.h" 50 51 #define _COMPONENT ACPI_EXECUTER 52 ACPI_MODULE_NAME("exresop") 53 54 /* Local prototypes */ 55 static acpi_status 56 acpi_ex_check_object_type(acpi_object_type type_needed, 57 acpi_object_type this_type, void *object); 58 59 /******************************************************************************* 60 * 61 * FUNCTION: acpi_ex_check_object_type 62 * 63 * PARAMETERS: type_needed Object type needed 64 * this_type Actual object type 65 * Object Object pointer 66 * 67 * RETURN: Status 68 * 69 * DESCRIPTION: Check required type against actual type 70 * 71 ******************************************************************************/ 72 73 static acpi_status 74 acpi_ex_check_object_type(acpi_object_type type_needed, 75 acpi_object_type this_type, void *object) 76 { 77 ACPI_FUNCTION_ENTRY(); 78 79 if (type_needed == ACPI_TYPE_ANY) { 80 81 /* All types OK, so we don't perform any typechecks */ 82 83 return (AE_OK); 84 } 85 86 if (type_needed == ACPI_TYPE_LOCAL_REFERENCE) { 87 /* 88 * Allow the AML "Constant" opcodes (Zero, One, etc.) to be reference 89 * objects and thus allow them to be targets. (As per the ACPI 90 * specification, a store to a constant is a noop.) 91 */ 92 if ((this_type == ACPI_TYPE_INTEGER) && 93 (((union acpi_operand_object *)object)->common. 94 flags & AOPOBJ_AML_CONSTANT)) { 95 return (AE_OK); 96 } 97 } 98 99 if (type_needed != this_type) { 100 ACPI_ERROR((AE_INFO, 101 "Needed type [%s], found [%s] %p", 102 acpi_ut_get_type_name(type_needed), 103 acpi_ut_get_type_name(this_type), object)); 104 105 return (AE_AML_OPERAND_TYPE); 106 } 107 108 return (AE_OK); 109 } 110 111 /******************************************************************************* 112 * 113 * FUNCTION: acpi_ex_resolve_operands 114 * 115 * PARAMETERS: opcode - Opcode being interpreted 116 * stack_ptr - Pointer to the operand stack to be 117 * resolved 118 * walk_state - Current state 119 * 120 * RETURN: Status 121 * 122 * DESCRIPTION: Convert multiple input operands to the types required by the 123 * target operator. 124 * 125 * Each 5-bit group in arg_types represents one required 126 * operand and indicates the required Type. The corresponding operand 127 * will be converted to the required type if possible, otherwise we 128 * abort with an exception. 129 * 130 ******************************************************************************/ 131 132 acpi_status 133 acpi_ex_resolve_operands(u16 opcode, 134 union acpi_operand_object ** stack_ptr, 135 struct acpi_walk_state * walk_state) 136 { 137 union acpi_operand_object *obj_desc; 138 acpi_status status = AE_OK; 139 u8 object_type; 140 u32 arg_types; 141 const struct acpi_opcode_info *op_info; 142 u32 this_arg_type; 143 acpi_object_type type_needed; 144 u16 target_op = 0; 145 146 ACPI_FUNCTION_TRACE_U32(ex_resolve_operands, opcode); 147 148 op_info = acpi_ps_get_opcode_info(opcode); 149 if (op_info->class == AML_CLASS_UNKNOWN) { 150 return_ACPI_STATUS(AE_AML_BAD_OPCODE); 151 } 152 153 arg_types = op_info->runtime_args; 154 if (arg_types == ARGI_INVALID_OPCODE) { 155 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", opcode)); 156 157 return_ACPI_STATUS(AE_AML_INTERNAL); 158 } 159 160 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 161 "Opcode %X [%s] RequiredOperandTypes=%8.8X\n", 162 opcode, op_info->name, arg_types)); 163 164 /* 165 * Normal exit is with (arg_types == 0) at end of argument list. 166 * Function will return an exception from within the loop upon 167 * finding an entry which is not (or cannot be converted 168 * to) the required type; if stack underflows; or upon 169 * finding a NULL stack entry (which should not happen). 170 */ 171 while (GET_CURRENT_ARG_TYPE(arg_types)) { 172 if (!stack_ptr || !*stack_ptr) { 173 ACPI_ERROR((AE_INFO, "Null stack entry at %p", 174 stack_ptr)); 175 176 return_ACPI_STATUS(AE_AML_INTERNAL); 177 } 178 179 /* Extract useful items */ 180 181 obj_desc = *stack_ptr; 182 183 /* Decode the descriptor type */ 184 185 switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) { 186 case ACPI_DESC_TYPE_NAMED: 187 188 /* Namespace Node */ 189 190 object_type = 191 ((struct acpi_namespace_node *)obj_desc)->type; 192 193 /* 194 * Resolve an alias object. The construction of these objects 195 * guarantees that there is only one level of alias indirection; 196 * thus, the attached object is always the aliased namespace node 197 */ 198 if (object_type == ACPI_TYPE_LOCAL_ALIAS) { 199 obj_desc = 200 acpi_ns_get_attached_object((struct 201 acpi_namespace_node 202 *)obj_desc); 203 *stack_ptr = obj_desc; 204 object_type = 205 ((struct acpi_namespace_node *)obj_desc)-> 206 type; 207 } 208 break; 209 210 case ACPI_DESC_TYPE_OPERAND: 211 212 /* ACPI internal object */ 213 214 object_type = obj_desc->common.type; 215 216 /* Check for bad acpi_object_type */ 217 218 if (!acpi_ut_valid_object_type(object_type)) { 219 ACPI_ERROR((AE_INFO, 220 "Bad operand object type [0x%X]", 221 object_type)); 222 223 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 224 } 225 226 if (object_type == (u8) ACPI_TYPE_LOCAL_REFERENCE) { 227 228 /* Validate the Reference */ 229 230 switch (obj_desc->reference.class) { 231 case ACPI_REFCLASS_DEBUG: 232 233 target_op = AML_DEBUG_OP; 234 235 /*lint -fallthrough */ 236 237 case ACPI_REFCLASS_ARG: 238 case ACPI_REFCLASS_LOCAL: 239 case ACPI_REFCLASS_INDEX: 240 case ACPI_REFCLASS_REFOF: 241 case ACPI_REFCLASS_TABLE: /* ddb_handle from LOAD_OP or LOAD_TABLE_OP */ 242 case ACPI_REFCLASS_NAME: /* Reference to a named object */ 243 244 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 245 "Operand is a Reference, Class [%s] %2.2X\n", 246 acpi_ut_get_reference_name 247 (obj_desc), 248 obj_desc->reference. 249 class)); 250 break; 251 252 default: 253 254 ACPI_ERROR((AE_INFO, 255 "Unknown Reference Class 0x%2.2X in %p", 256 obj_desc->reference.class, 257 obj_desc)); 258 259 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 260 } 261 } 262 break; 263 264 default: 265 266 /* Invalid descriptor */ 267 268 ACPI_ERROR((AE_INFO, "Invalid descriptor %p [%s]", 269 obj_desc, 270 acpi_ut_get_descriptor_name(obj_desc))); 271 272 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 273 } 274 275 /* Get one argument type, point to the next */ 276 277 this_arg_type = GET_CURRENT_ARG_TYPE(arg_types); 278 INCREMENT_ARG_LIST(arg_types); 279 280 /* 281 * Handle cases where the object does not need to be 282 * resolved to a value 283 */ 284 switch (this_arg_type) { 285 case ARGI_REF_OR_STRING: /* Can be a String or Reference */ 286 287 if ((ACPI_GET_DESCRIPTOR_TYPE(obj_desc) == 288 ACPI_DESC_TYPE_OPERAND) 289 && (obj_desc->common.type == ACPI_TYPE_STRING)) { 290 /* 291 * String found - the string references a named object and 292 * must be resolved to a node 293 */ 294 goto next_operand; 295 } 296 297 /* 298 * Else not a string - fall through to the normal Reference 299 * case below 300 */ 301 /*lint -fallthrough */ 302 303 case ARGI_REFERENCE: /* References: */ 304 case ARGI_INTEGER_REF: 305 case ARGI_OBJECT_REF: 306 case ARGI_DEVICE_REF: 307 case ARGI_TARGETREF: /* Allows implicit conversion rules before store */ 308 case ARGI_FIXED_TARGET: /* No implicit conversion before store to target */ 309 case ARGI_SIMPLE_TARGET: /* Name, Local, or arg - no implicit conversion */ 310 /* 311 * Need an operand of type ACPI_TYPE_LOCAL_REFERENCE 312 * A Namespace Node is OK as-is 313 */ 314 if (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) == 315 ACPI_DESC_TYPE_NAMED) { 316 goto next_operand; 317 } 318 319 status = 320 acpi_ex_check_object_type(ACPI_TYPE_LOCAL_REFERENCE, 321 object_type, obj_desc); 322 if (ACPI_FAILURE(status)) { 323 return_ACPI_STATUS(status); 324 } 325 goto next_operand; 326 327 case ARGI_DATAREFOBJ: /* Store operator only */ 328 /* 329 * We don't want to resolve index_op reference objects during 330 * a store because this would be an implicit de_ref_of operation. 331 * Instead, we just want to store the reference object. 332 * -- All others must be resolved below. 333 */ 334 if ((opcode == AML_STORE_OP) && 335 ((*stack_ptr)->common.type == 336 ACPI_TYPE_LOCAL_REFERENCE) 337 && ((*stack_ptr)->reference.class == 338 ACPI_REFCLASS_INDEX)) { 339 goto next_operand; 340 } 341 break; 342 343 default: 344 345 /* All cases covered above */ 346 347 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 * Need an operand of type ACPI_TYPE_BUFFER, 438 * But we can implicitly convert from a STRING or INTEGER 439 * aka - "Implicit Source Operand Conversion" 440 */ 441 status = acpi_ex_convert_to_buffer(obj_desc, stack_ptr); 442 if (ACPI_FAILURE(status)) { 443 if (status == AE_TYPE) { 444 ACPI_ERROR((AE_INFO, 445 "Needed [Integer/String/Buffer], found [%s] %p", 446 acpi_ut_get_object_type_name 447 (obj_desc), obj_desc)); 448 449 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 450 } 451 452 return_ACPI_STATUS(status); 453 } 454 455 if (obj_desc != *stack_ptr) { 456 acpi_ut_remove_reference(obj_desc); 457 } 458 goto next_operand; 459 460 case ARGI_STRING: 461 /* 462 * Need an operand of type ACPI_TYPE_STRING, 463 * But we can implicitly convert from a BUFFER or INTEGER 464 * aka - "Implicit Source Operand Conversion" 465 */ 466 status = acpi_ex_convert_to_string(obj_desc, stack_ptr, 467 ACPI_IMPLICIT_CONVERT_HEX); 468 if (ACPI_FAILURE(status)) { 469 if (status == AE_TYPE) { 470 ACPI_ERROR((AE_INFO, 471 "Needed [Integer/String/Buffer], found [%s] %p", 472 acpi_ut_get_object_type_name 473 (obj_desc), obj_desc)); 474 475 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 476 } 477 478 return_ACPI_STATUS(status); 479 } 480 481 if (obj_desc != *stack_ptr) { 482 acpi_ut_remove_reference(obj_desc); 483 } 484 goto next_operand; 485 486 case ARGI_COMPUTEDATA: 487 488 /* Need an operand of type INTEGER, STRING or BUFFER */ 489 490 switch (obj_desc->common.type) { 491 case ACPI_TYPE_INTEGER: 492 case ACPI_TYPE_STRING: 493 case ACPI_TYPE_BUFFER: 494 495 /* Valid operand */ 496 break; 497 498 default: 499 ACPI_ERROR((AE_INFO, 500 "Needed [Integer/String/Buffer], found [%s] %p", 501 acpi_ut_get_object_type_name 502 (obj_desc), obj_desc)); 503 504 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 505 } 506 goto next_operand; 507 508 case ARGI_BUFFER_OR_STRING: 509 510 /* Need an operand of type STRING or BUFFER */ 511 512 switch (obj_desc->common.type) { 513 case ACPI_TYPE_STRING: 514 case ACPI_TYPE_BUFFER: 515 516 /* Valid operand */ 517 break; 518 519 case ACPI_TYPE_INTEGER: 520 521 /* Highest priority conversion is to type Buffer */ 522 523 status = 524 acpi_ex_convert_to_buffer(obj_desc, 525 stack_ptr); 526 if (ACPI_FAILURE(status)) { 527 return_ACPI_STATUS(status); 528 } 529 530 if (obj_desc != *stack_ptr) { 531 acpi_ut_remove_reference(obj_desc); 532 } 533 break; 534 535 default: 536 ACPI_ERROR((AE_INFO, 537 "Needed [Integer/String/Buffer], found [%s] %p", 538 acpi_ut_get_object_type_name 539 (obj_desc), obj_desc)); 540 541 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 542 } 543 goto next_operand; 544 545 case ARGI_DATAOBJECT: 546 /* 547 * ARGI_DATAOBJECT is only used by the size_of operator. 548 * Need a buffer, string, package, or ref_of reference. 549 * 550 * The only reference allowed here is a direct reference to 551 * a namespace node. 552 */ 553 switch (obj_desc->common.type) { 554 case ACPI_TYPE_PACKAGE: 555 case ACPI_TYPE_STRING: 556 case ACPI_TYPE_BUFFER: 557 case ACPI_TYPE_LOCAL_REFERENCE: 558 559 /* Valid operand */ 560 break; 561 562 default: 563 564 ACPI_ERROR((AE_INFO, 565 "Needed [Buffer/String/Package/Reference], found [%s] %p", 566 acpi_ut_get_object_type_name 567 (obj_desc), obj_desc)); 568 569 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 570 } 571 goto next_operand; 572 573 case ARGI_COMPLEXOBJ: 574 575 /* Need a buffer or package or (ACPI 2.0) String */ 576 577 switch (obj_desc->common.type) { 578 case ACPI_TYPE_PACKAGE: 579 case ACPI_TYPE_STRING: 580 case ACPI_TYPE_BUFFER: 581 582 /* Valid operand */ 583 break; 584 585 default: 586 587 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: 608 609 ACPI_ERROR((AE_INFO, 610 "Needed [Region/Buffer], found [%s] %p", 611 acpi_ut_get_object_type_name 612 (obj_desc), obj_desc)); 613 614 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 615 } 616 goto next_operand; 617 618 case ARGI_DATAREFOBJ: 619 620 /* Used by the Store() operator only */ 621 622 switch (obj_desc->common.type) { 623 case ACPI_TYPE_INTEGER: 624 case ACPI_TYPE_PACKAGE: 625 case ACPI_TYPE_STRING: 626 case ACPI_TYPE_BUFFER: 627 case ACPI_TYPE_BUFFER_FIELD: 628 case ACPI_TYPE_LOCAL_REFERENCE: 629 case ACPI_TYPE_LOCAL_REGION_FIELD: 630 case ACPI_TYPE_LOCAL_BANK_FIELD: 631 case ACPI_TYPE_LOCAL_INDEX_FIELD: 632 case ACPI_TYPE_DDB_HANDLE: 633 634 /* Valid operand */ 635 break; 636 637 default: 638 639 if (acpi_gbl_enable_interpreter_slack) { 640 /* 641 * Enable original behavior of Store(), allowing any and all 642 * objects as the source operand. The ACPI spec does not 643 * allow this, however. 644 */ 645 break; 646 } 647 648 if (target_op == AML_DEBUG_OP) { 649 650 /* Allow store of any object to the Debug object */ 651 652 break; 653 } 654 655 ACPI_ERROR((AE_INFO, 656 "Needed Integer/Buffer/String/Package/Ref/Ddb], found [%s] %p", 657 acpi_ut_get_object_type_name 658 (obj_desc), obj_desc)); 659 660 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 661 } 662 goto next_operand; 663 664 default: 665 666 /* Unknown type */ 667 668 ACPI_ERROR((AE_INFO, 669 "Internal - Unknown ARGI (required operand) type 0x%X", 670 this_arg_type)); 671 672 return_ACPI_STATUS(AE_BAD_PARAMETER); 673 } 674 675 /* 676 * Make sure that the original object was resolved to the 677 * required object type (Simple cases only). 678 */ 679 status = acpi_ex_check_object_type(type_needed, 680 (*stack_ptr)->common.type, 681 *stack_ptr); 682 if (ACPI_FAILURE(status)) { 683 return_ACPI_STATUS(status); 684 } 685 686 next_operand: 687 /* 688 * If more operands needed, decrement stack_ptr to point 689 * to next operand on stack 690 */ 691 if (GET_CURRENT_ARG_TYPE(arg_types)) { 692 stack_ptr--; 693 } 694 } 695 696 ACPI_DUMP_OPERANDS(walk_state->operands, 697 acpi_ps_get_opcode_name(opcode), 698 walk_state->num_operands); 699 700 return_ACPI_STATUS(status); 701 } 702