1 /****************************************************************************** 2 * 3 * Module Name: exresop - AML Interpreter operand/object resolution 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2017, 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.flags & 94 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 = acpi_ns_get_attached_object((struct 200 acpi_namespace_node 201 *) 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_SIMPLE_TARGET: /* Name, Local, or arg - no implicit conversion */ 309 case ARGI_STORE_TARGET: 310 311 /* 312 * Need an operand of type ACPI_TYPE_LOCAL_REFERENCE 313 * A Namespace Node is OK as-is 314 */ 315 if (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) == 316 ACPI_DESC_TYPE_NAMED) { 317 goto next_operand; 318 } 319 320 status = 321 acpi_ex_check_object_type(ACPI_TYPE_LOCAL_REFERENCE, 322 object_type, obj_desc); 323 if (ACPI_FAILURE(status)) { 324 return_ACPI_STATUS(status); 325 } 326 goto next_operand; 327 328 case ARGI_DATAREFOBJ: /* Store operator only */ 329 /* 330 * We don't want to resolve index_op reference objects during 331 * a store because this would be an implicit de_ref_of operation. 332 * Instead, we just want to store the reference object. 333 * -- All others must be resolved below. 334 */ 335 if ((opcode == AML_STORE_OP) && 336 ((*stack_ptr)->common.type == 337 ACPI_TYPE_LOCAL_REFERENCE) 338 && ((*stack_ptr)->reference.class == 339 ACPI_REFCLASS_INDEX)) { 340 goto next_operand; 341 } 342 break; 343 344 default: 345 346 /* All cases covered above */ 347 348 break; 349 } 350 351 /* 352 * Resolve this object to a value 353 */ 354 status = acpi_ex_resolve_to_value(stack_ptr, walk_state); 355 if (ACPI_FAILURE(status)) { 356 return_ACPI_STATUS(status); 357 } 358 359 /* Get the resolved object */ 360 361 obj_desc = *stack_ptr; 362 363 /* 364 * Check the resulting object (value) type 365 */ 366 switch (this_arg_type) { 367 /* 368 * For the simple cases, only one type of resolved object 369 * is allowed 370 */ 371 case ARGI_MUTEX: 372 373 /* Need an operand of type ACPI_TYPE_MUTEX */ 374 375 type_needed = ACPI_TYPE_MUTEX; 376 break; 377 378 case ARGI_EVENT: 379 380 /* Need an operand of type ACPI_TYPE_EVENT */ 381 382 type_needed = ACPI_TYPE_EVENT; 383 break; 384 385 case ARGI_PACKAGE: /* Package */ 386 387 /* Need an operand of type ACPI_TYPE_PACKAGE */ 388 389 type_needed = ACPI_TYPE_PACKAGE; 390 break; 391 392 case ARGI_ANYTYPE: 393 394 /* Any operand type will do */ 395 396 type_needed = ACPI_TYPE_ANY; 397 break; 398 399 case ARGI_DDBHANDLE: 400 401 /* Need an operand of type ACPI_TYPE_DDB_HANDLE */ 402 403 type_needed = ACPI_TYPE_LOCAL_REFERENCE; 404 break; 405 406 /* 407 * The more complex cases allow multiple resolved object types 408 */ 409 case ARGI_INTEGER: 410 411 /* 412 * Need an operand of type ACPI_TYPE_INTEGER, but we can 413 * implicitly convert from a STRING or BUFFER. 414 * 415 * Known as "Implicit Source Operand Conversion" 416 */ 417 status = acpi_ex_convert_to_integer(obj_desc, stack_ptr, 418 ACPI_STRTOUL_BASE16); 419 if (ACPI_FAILURE(status)) { 420 if (status == AE_TYPE) { 421 ACPI_ERROR((AE_INFO, 422 "Needed [Integer/String/Buffer], found [%s] %p", 423 acpi_ut_get_object_type_name 424 (obj_desc), obj_desc)); 425 426 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 427 } 428 429 return_ACPI_STATUS(status); 430 } 431 432 if (obj_desc != *stack_ptr) { 433 acpi_ut_remove_reference(obj_desc); 434 } 435 goto next_operand; 436 437 case ARGI_BUFFER: 438 /* 439 * Need an operand of type ACPI_TYPE_BUFFER, 440 * But we can implicitly convert from a STRING or INTEGER 441 * aka - "Implicit Source Operand Conversion" 442 */ 443 status = acpi_ex_convert_to_buffer(obj_desc, stack_ptr); 444 if (ACPI_FAILURE(status)) { 445 if (status == AE_TYPE) { 446 ACPI_ERROR((AE_INFO, 447 "Needed [Integer/String/Buffer], found [%s] %p", 448 acpi_ut_get_object_type_name 449 (obj_desc), obj_desc)); 450 451 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 452 } 453 454 return_ACPI_STATUS(status); 455 } 456 457 if (obj_desc != *stack_ptr) { 458 acpi_ut_remove_reference(obj_desc); 459 } 460 goto next_operand; 461 462 case ARGI_STRING: 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 = 469 acpi_ex_convert_to_string(obj_desc, stack_ptr, 470 ACPI_IMPLICIT_CONVERT_HEX); 471 if (ACPI_FAILURE(status)) { 472 if (status == AE_TYPE) { 473 ACPI_ERROR((AE_INFO, 474 "Needed [Integer/String/Buffer], found [%s] %p", 475 acpi_ut_get_object_type_name 476 (obj_desc), obj_desc)); 477 478 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 479 } 480 481 return_ACPI_STATUS(status); 482 } 483 484 if (obj_desc != *stack_ptr) { 485 acpi_ut_remove_reference(obj_desc); 486 } 487 goto next_operand; 488 489 case ARGI_COMPUTEDATA: 490 491 /* Need an operand of type INTEGER, STRING or BUFFER */ 492 493 switch (obj_desc->common.type) { 494 case ACPI_TYPE_INTEGER: 495 case ACPI_TYPE_STRING: 496 case ACPI_TYPE_BUFFER: 497 498 /* Valid operand */ 499 break; 500 501 default: 502 ACPI_ERROR((AE_INFO, 503 "Needed [Integer/String/Buffer], found [%s] %p", 504 acpi_ut_get_object_type_name 505 (obj_desc), obj_desc)); 506 507 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 508 } 509 goto next_operand; 510 511 case ARGI_BUFFER_OR_STRING: 512 513 /* Need an operand of type STRING or BUFFER */ 514 515 switch (obj_desc->common.type) { 516 case ACPI_TYPE_STRING: 517 case ACPI_TYPE_BUFFER: 518 519 /* Valid operand */ 520 break; 521 522 case ACPI_TYPE_INTEGER: 523 524 /* Highest priority conversion is to type Buffer */ 525 526 status = 527 acpi_ex_convert_to_buffer(obj_desc, 528 stack_ptr); 529 if (ACPI_FAILURE(status)) { 530 return_ACPI_STATUS(status); 531 } 532 533 if (obj_desc != *stack_ptr) { 534 acpi_ut_remove_reference(obj_desc); 535 } 536 break; 537 538 default: 539 ACPI_ERROR((AE_INFO, 540 "Needed [Integer/String/Buffer], found [%s] %p", 541 acpi_ut_get_object_type_name 542 (obj_desc), obj_desc)); 543 544 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 545 } 546 goto next_operand; 547 548 case ARGI_DATAOBJECT: 549 /* 550 * ARGI_DATAOBJECT is only used by the size_of operator. 551 * Need a buffer, string, package, or ref_of reference. 552 * 553 * The only reference allowed here is a direct reference to 554 * a namespace node. 555 */ 556 switch (obj_desc->common.type) { 557 case ACPI_TYPE_PACKAGE: 558 case ACPI_TYPE_STRING: 559 case ACPI_TYPE_BUFFER: 560 case ACPI_TYPE_LOCAL_REFERENCE: 561 562 /* Valid operand */ 563 break; 564 565 default: 566 567 ACPI_ERROR((AE_INFO, 568 "Needed [Buffer/String/Package/Reference], found [%s] %p", 569 acpi_ut_get_object_type_name 570 (obj_desc), obj_desc)); 571 572 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 573 } 574 goto next_operand; 575 576 case ARGI_COMPLEXOBJ: 577 578 /* Need a buffer or package or (ACPI 2.0) String */ 579 580 switch (obj_desc->common.type) { 581 case ACPI_TYPE_PACKAGE: 582 case ACPI_TYPE_STRING: 583 case ACPI_TYPE_BUFFER: 584 585 /* Valid operand */ 586 break; 587 588 default: 589 590 ACPI_ERROR((AE_INFO, 591 "Needed [Buffer/String/Package], found [%s] %p", 592 acpi_ut_get_object_type_name 593 (obj_desc), obj_desc)); 594 595 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 596 } 597 goto next_operand; 598 599 case ARGI_REGION_OR_BUFFER: /* Used by Load() only */ 600 601 /* 602 * Need an operand of type REGION or a BUFFER 603 * (which could be a resolved region field) 604 */ 605 switch (obj_desc->common.type) { 606 case ACPI_TYPE_BUFFER: 607 case ACPI_TYPE_REGION: 608 609 /* Valid operand */ 610 break; 611 612 default: 613 614 ACPI_ERROR((AE_INFO, 615 "Needed [Region/Buffer], found [%s] %p", 616 acpi_ut_get_object_type_name 617 (obj_desc), obj_desc)); 618 619 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 620 } 621 goto next_operand; 622 623 case ARGI_DATAREFOBJ: 624 625 /* Used by the Store() operator only */ 626 627 switch (obj_desc->common.type) { 628 case ACPI_TYPE_INTEGER: 629 case ACPI_TYPE_PACKAGE: 630 case ACPI_TYPE_STRING: 631 case ACPI_TYPE_BUFFER: 632 case ACPI_TYPE_BUFFER_FIELD: 633 case ACPI_TYPE_LOCAL_REFERENCE: 634 case ACPI_TYPE_LOCAL_REGION_FIELD: 635 case ACPI_TYPE_LOCAL_BANK_FIELD: 636 case ACPI_TYPE_LOCAL_INDEX_FIELD: 637 case ACPI_TYPE_DDB_HANDLE: 638 639 /* Valid operand */ 640 break; 641 642 default: 643 644 if (acpi_gbl_enable_interpreter_slack) { 645 /* 646 * Enable original behavior of Store(), allowing any 647 * and all objects as the source operand. The ACPI 648 * spec does not allow this, however. 649 */ 650 break; 651 } 652 653 if (target_op == AML_DEBUG_OP) { 654 655 /* Allow store of any object to the Debug object */ 656 657 break; 658 } 659 660 ACPI_ERROR((AE_INFO, 661 "Needed Integer/Buffer/String/Package/Ref/Ddb]" 662 ", found [%s] %p", 663 acpi_ut_get_object_type_name 664 (obj_desc), obj_desc)); 665 666 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 667 } 668 goto next_operand; 669 670 default: 671 672 /* Unknown type */ 673 674 ACPI_ERROR((AE_INFO, 675 "Internal - Unknown ARGI (required operand) type 0x%X", 676 this_arg_type)); 677 678 return_ACPI_STATUS(AE_BAD_PARAMETER); 679 } 680 681 /* 682 * Make sure that the original object was resolved to the 683 * required object type (Simple cases only). 684 */ 685 status = 686 acpi_ex_check_object_type(type_needed, 687 (*stack_ptr)->common.type, 688 *stack_ptr); 689 if (ACPI_FAILURE(status)) { 690 return_ACPI_STATUS(status); 691 } 692 693 next_operand: 694 /* 695 * If more operands needed, decrement stack_ptr to point 696 * to next operand on stack 697 */ 698 if (GET_CURRENT_ARG_TYPE(arg_types)) { 699 stack_ptr--; 700 } 701 } 702 703 ACPI_DUMP_OPERANDS(walk_state->operands, 704 acpi_ps_get_opcode_name(opcode), 705 walk_state->num_operands); 706 707 return_ACPI_STATUS(status); 708 } 709