1/****************************************************************************** 2 * 3 * Module Name: aslxref - Namespace cross-reference 4 * 5 *****************************************************************************/ 6 7/****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2020, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 ***************************************************************************** 115 * 116 * Alternatively, you may choose to be licensed under the terms of the 117 * following license: 118 * 119 * Redistribution and use in source and binary forms, with or without 120 * modification, are permitted provided that the following conditions 121 * are met: 122 * 1. Redistributions of source code must retain the above copyright 123 * notice, this list of conditions, and the following disclaimer, 124 * without modification. 125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 126 * substantially similar to the "NO WARRANTY" disclaimer below 127 * ("Disclaimer") and any redistribution must be conditioned upon 128 * including a substantially similar Disclaimer requirement for further 129 * binary redistribution. 130 * 3. Neither the names of the above-listed copyright holders nor the names 131 * of any contributors may be used to endorse or promote products derived 132 * from this software without specific prior written permission. 133 * 134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 145 * 146 * Alternatively, you may choose to be licensed under the terms of the 147 * GNU General Public License ("GPL") version 2 as published by the Free 148 * Software Foundation. 149 * 150 *****************************************************************************/ 151 152#include <contrib/dev/acpica/compiler/aslcompiler.h> 153#include "aslcompiler.y.h" 154#include <contrib/dev/acpica/include/acparser.h> 155#include <contrib/dev/acpica/include/amlcode.h> 156#include <contrib/dev/acpica/include/acnamesp.h> 157#include <contrib/dev/acpica/include/acdispat.h> 158 159 160#define _COMPONENT ACPI_COMPILER 161 ACPI_MODULE_NAME ("aslxref") 162 163/* Local prototypes */ 164 165static ACPI_STATUS 166XfNamespaceLocateBegin ( 167 ACPI_PARSE_OBJECT *Op, 168 UINT32 Level, 169 void *Context); 170 171static ACPI_STATUS 172XfNamespaceLocateEnd ( 173 ACPI_PARSE_OBJECT *Op, 174 UINT32 Level, 175 void *Context); 176 177static BOOLEAN 178XfValidateCrossReference ( 179 ACPI_PARSE_OBJECT *Op, 180 const ACPI_OPCODE_INFO *OpInfo, 181 ACPI_NAMESPACE_NODE *Node); 182 183static BOOLEAN 184XfObjectExists ( 185 char *Name); 186 187static ACPI_STATUS 188XfCompareOneNamespaceObject ( 189 ACPI_HANDLE ObjHandle, 190 UINT32 Level, 191 void *Context, 192 void **ReturnValue); 193 194static void 195XfCheckFieldRange ( 196 ACPI_PARSE_OBJECT *Op, 197 UINT32 RegionBitLength, 198 UINT32 FieldBitOffset, 199 UINT32 FieldBitLength, 200 UINT32 AccessBitWidth); 201 202static BOOLEAN 203XfFindCondRefOfName ( 204 ACPI_NAMESPACE_NODE *Node, 205 ACPI_PARSE_OBJECT *Op); 206 207static BOOLEAN 208XfRefIsGuardedByIfCondRefOf ( 209 ACPI_NAMESPACE_NODE *Node, 210 ACPI_PARSE_OBJECT *Op); 211 212 213/******************************************************************************* 214 * 215 * FUNCTION: XfCrossReferenceNamespace 216 * 217 * PARAMETERS: None 218 * 219 * RETURN: Status 220 * 221 * DESCRIPTION: Perform a cross reference check of the parse tree against the 222 * namespace. Every named referenced within the parse tree 223 * should be get resolved with a namespace lookup. If not, the 224 * original reference in the ASL code is invalid -- i.e., refers 225 * to a non-existent object. 226 * 227 * NOTE: The ASL "External" operator causes the name to be inserted into the 228 * namespace so that references to the external name will be resolved 229 * correctly here. 230 * 231 ******************************************************************************/ 232 233ACPI_STATUS 234XfCrossReferenceNamespace ( 235 void) 236{ 237 ACPI_WALK_STATE *WalkState; 238 239 240 /* 241 * Create a new walk state for use when looking up names 242 * within the namespace (Passed as context to the callbacks) 243 */ 244 WalkState = AcpiDsCreateWalkState (0, NULL, NULL, NULL); 245 if (!WalkState) 246 { 247 return (AE_NO_MEMORY); 248 } 249 250 /* Walk the entire parse tree */ 251 252 TrWalkParseTree (AslGbl_ParseTreeRoot, ASL_WALK_VISIT_TWICE, 253 XfNamespaceLocateBegin, XfNamespaceLocateEnd, WalkState); 254 255 ACPI_FREE (WalkState); 256 return (AE_OK); 257} 258 259 260/******************************************************************************* 261 * 262 * FUNCTION: XfObjectExists 263 * 264 * PARAMETERS: Name - 4 char ACPI name 265 * 266 * RETURN: TRUE if name exists in namespace 267 * 268 * DESCRIPTION: Walk the namespace to find an object 269 * 270 ******************************************************************************/ 271 272static BOOLEAN 273XfObjectExists ( 274 char *Name) 275{ 276 ACPI_STATUS Status; 277 278 279 /* Walk entire namespace from the supplied root */ 280 281 Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, 282 ACPI_UINT32_MAX, FALSE, XfCompareOneNamespaceObject, NULL, 283 Name, NULL); 284 if (Status == AE_CTRL_TRUE) 285 { 286 /* At least one instance of the name was found */ 287 288 return (TRUE); 289 } 290 291 return (FALSE); 292} 293 294 295/******************************************************************************* 296 * 297 * FUNCTION: XfCompareOneNamespaceObject 298 * 299 * PARAMETERS: ACPI_WALK_CALLBACK 300 * 301 * RETURN: Status 302 * 303 * DESCRIPTION: Compare name of one object. 304 * 305 ******************************************************************************/ 306 307static ACPI_STATUS 308XfCompareOneNamespaceObject ( 309 ACPI_HANDLE ObjHandle, 310 UINT32 Level, 311 void *Context, 312 void **ReturnValue) 313{ 314 ACPI_NAMESPACE_NODE *Node = (ACPI_NAMESPACE_NODE *) ObjHandle; 315 316 317 /* Simply check the name */ 318 319 if (*((UINT32 *) (Context)) == Node->Name.Integer) 320 { 321 /* Abort walk if we found one instance */ 322 323 return (AE_CTRL_TRUE); 324 } 325 326 return (AE_OK); 327} 328 329 330/******************************************************************************* 331 * 332 * FUNCTION: XfCheckFieldRange 333 * 334 * PARAMETERS: RegionBitLength - Length of entire parent region 335 * FieldBitOffset - Start of the field unit (within region) 336 * FieldBitLength - Entire length of field unit 337 * AccessBitWidth - Access width of the field unit 338 * 339 * RETURN: None 340 * 341 * DESCRIPTION: Check one field unit to make sure it fits in the parent 342 * op region. 343 * 344 * Note: AccessBitWidth must be either 8,16,32, or 64 345 * 346 ******************************************************************************/ 347 348static void 349XfCheckFieldRange ( 350 ACPI_PARSE_OBJECT *Op, 351 UINT32 RegionBitLength, 352 UINT32 FieldBitOffset, 353 UINT32 FieldBitLength, 354 UINT32 AccessBitWidth) 355{ 356 UINT32 FieldEndBitOffset; 357 358 359 /* 360 * Check each field unit against the region size. The entire 361 * field unit (start offset plus length) must fit within the 362 * region. 363 */ 364 FieldEndBitOffset = FieldBitOffset + FieldBitLength; 365 366 if (FieldEndBitOffset > RegionBitLength) 367 { 368 /* Field definition itself is beyond the end-of-region */ 369 370 AslError (ASL_ERROR, ASL_MSG_FIELD_UNIT_OFFSET, Op, NULL); 371 return; 372 } 373 374 /* 375 * Now check that the field plus AccessWidth doesn't go beyond 376 * the end-of-region. Assumes AccessBitWidth is a power of 2 377 */ 378 FieldEndBitOffset = ACPI_ROUND_UP (FieldEndBitOffset, AccessBitWidth); 379 380 if (FieldEndBitOffset > RegionBitLength) 381 { 382 /* Field definition combined with the access is beyond EOR */ 383 384 AslError (ASL_ERROR, ASL_MSG_FIELD_UNIT_ACCESS_WIDTH, Op, NULL); 385 } 386} 387 388 389/******************************************************************************* 390 * 391 * FUNCTION: XfNamespaceLocateBegin 392 * 393 * PARAMETERS: ASL_WALK_CALLBACK 394 * 395 * RETURN: Status 396 * 397 * DESCRIPTION: Descending callback used during cross-reference. For named 398 * object references, attempt to locate the name in the 399 * namespace. 400 * 401 * NOTE: ASL references to named fields within resource descriptors are 402 * resolved to integer values here. Therefore, this step is an 403 * important part of the code generation. We don't know that the 404 * name refers to a resource descriptor until now. 405 * 406 ******************************************************************************/ 407 408static ACPI_STATUS 409XfNamespaceLocateBegin ( 410 ACPI_PARSE_OBJECT *Op, 411 UINT32 Level, 412 void *Context) 413{ 414 ACPI_WALK_STATE *WalkState = (ACPI_WALK_STATE *) Context; 415 ACPI_NAMESPACE_NODE *Node; 416 ACPI_STATUS Status; 417 ACPI_OBJECT_TYPE ObjectType; 418 char *Path; 419 UINT8 PassedArgs; 420 ACPI_PARSE_OBJECT *NextOp; 421 ACPI_PARSE_OBJECT *OwningOp; 422 ACPI_PARSE_OBJECT *SpaceIdOp; 423 UINT32 MinimumLength; 424 UINT32 Offset; 425 UINT32 FieldBitLength; 426 UINT32 TagBitLength; 427 UINT8 Message = 0; 428 const ACPI_OPCODE_INFO *OpInfo; 429 UINT32 Flags; 430 ASL_METHOD_LOCAL *MethodLocals = NULL; 431 ASL_METHOD_LOCAL *MethodArgs = NULL; 432 int RegisterNumber; 433 UINT32 i; 434 ACPI_NAMESPACE_NODE *DeclarationParentMethod; 435 ACPI_PARSE_OBJECT *ReferenceParentMethod; 436 char *ExternalPath; 437 438 439 ACPI_FUNCTION_TRACE_PTR (XfNamespaceLocateBegin, Op); 440 441 442 if ((Op->Asl.AmlOpcode == AML_METHOD_OP) && Op->Asl.Node) 443 { 444 Node = Op->Asl.Node; 445 446 /* Support for method LocalX/ArgX analysis */ 447 448 if (!Node->MethodLocals) 449 { 450 /* Create local/arg info blocks */ 451 452 MethodLocals = UtLocalCalloc ( 453 sizeof (ASL_METHOD_LOCAL) * ACPI_METHOD_NUM_LOCALS); 454 Node->MethodLocals = MethodLocals; 455 456 MethodArgs = UtLocalCalloc ( 457 sizeof (ASL_METHOD_LOCAL) * ACPI_METHOD_NUM_ARGS); 458 Node->MethodArgs = MethodArgs; 459 460 /* 461 * Get the method argument count 462 * First, get the name node 463 */ 464 NextOp = Op->Asl.Child; 465 466 /* Get the NumArguments node */ 467 468 NextOp = NextOp->Asl.Next; 469 Node->ArgCount = (UINT8) 470 (((UINT8) NextOp->Asl.Value.Integer) & 0x07); 471 472 /* We will track all possible ArgXs */ 473 474 for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++) 475 { 476 if (i < Node->ArgCount) 477 { 478 /* Real Args are always "initialized" */ 479 480 MethodArgs[i].Flags = ASL_ARG_INITIALIZED; 481 } 482 else 483 { 484 /* Other ArgXs can be used as locals */ 485 486 MethodArgs[i].Flags = ASL_ARG_IS_LOCAL; 487 } 488 489 MethodArgs[i].Op = Op; 490 } 491 } 492 } 493 494 /* 495 * If this node is the actual declaration of a name 496 * [such as the XXXX name in "Method (XXXX)"], 497 * we are not interested in it here. We only care about names that are 498 * references to other objects within the namespace and the parent objects 499 * of name declarations 500 */ 501 if (Op->Asl.CompileFlags & OP_IS_NAME_DECLARATION) 502 { 503 return_ACPI_STATUS (AE_OK); 504 } 505 506 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode); 507 508 /* Check method LocalX variables */ 509 510 if (OpInfo->Type == AML_TYPE_LOCAL_VARIABLE) 511 { 512 /* Find parent method Op */ 513 514 NextOp = UtGetParentMethodOp (Op); 515 if (!NextOp) 516 { 517 return_ACPI_STATUS (AE_OK); 518 } 519 520 /* Get method node */ 521 522 Node = NextOp->Asl.Node; 523 524 RegisterNumber = Op->Asl.AmlOpcode & 0x0007; /* 0x60 through 0x67 */ 525 MethodLocals = Node->MethodLocals; 526 527 if (Op->Asl.CompileFlags & OP_IS_TARGET) 528 { 529 /* Local is being initialized */ 530 531 MethodLocals[RegisterNumber].Flags |= ASL_LOCAL_INITIALIZED; 532 MethodLocals[RegisterNumber].Op = Op; 533 534 return_ACPI_STATUS (AE_OK); 535 } 536 537 /* Mark this Local as referenced */ 538 539 MethodLocals[RegisterNumber].Flags |= ASL_LOCAL_REFERENCED; 540 MethodLocals[RegisterNumber].Op = Op; 541 542 return_ACPI_STATUS (AE_OK); 543 } 544 545 /* Check method ArgX variables */ 546 547 if (OpInfo->Type == AML_TYPE_METHOD_ARGUMENT) 548 { 549 /* Find parent method Op */ 550 551 NextOp = UtGetParentMethodOp (Op); 552 if (!NextOp) 553 { 554 return_ACPI_STATUS (AE_OK); 555 } 556 557 /* Get method node */ 558 559 Node = NextOp->Asl.Node; 560 561 /* Get Arg # */ 562 563 RegisterNumber = Op->Asl.AmlOpcode - AML_ARG0; /* 0x68 through 0x6F */ 564 MethodArgs = Node->MethodArgs; 565 566 /* Mark this Arg as referenced */ 567 568 MethodArgs[RegisterNumber].Flags |= ASL_ARG_REFERENCED; 569 MethodArgs[RegisterNumber].Op = Op; 570 571 if (Op->Asl.CompileFlags & OP_IS_TARGET) 572 { 573 /* Arg is being initialized */ 574 575 MethodArgs[RegisterNumber].Flags |= ASL_ARG_INITIALIZED; 576 } 577 578 return_ACPI_STATUS (AE_OK); 579 } 580 581 /* 582 * After method ArgX and LocalX, we are only interested in opcodes 583 * that have an associated name 584 */ 585 if ((!(OpInfo->Flags & AML_NAMED)) && 586 (!(OpInfo->Flags & AML_CREATE)) && 587 (Op->Asl.ParseOpcode != PARSEOP_NAMESTRING) && 588 (Op->Asl.ParseOpcode != PARSEOP_NAMESEG) && 589 (Op->Asl.ParseOpcode != PARSEOP_METHODCALL) && 590 (Op->Asl.ParseOpcode != PARSEOP_EXTERNAL)) 591 { 592 return_ACPI_STATUS (AE_OK); 593 } 594 595 /* 596 * We must enable the "search-to-root" for single NameSegs, but 597 * we have to be very careful about opening up scopes 598 */ 599 Flags = ACPI_NS_SEARCH_PARENT; 600 if ((Op->Asl.ParseOpcode == PARSEOP_NAMESTRING) || 601 (Op->Asl.ParseOpcode == PARSEOP_NAMESEG) || 602 (Op->Asl.ParseOpcode == PARSEOP_METHODCALL) || 603 (Op->Asl.ParseOpcode == PARSEOP_EXTERNAL) || 604 (Op->Asl.ParseOpcode == PARSEOP_CONDREFOF)) 605 { 606 /* 607 * These are name references, do not push the scope stack 608 * for them. 609 */ 610 Flags |= ACPI_NS_DONT_OPEN_SCOPE; 611 } 612 613 /* Get the NamePath from the appropriate place */ 614 615 if (OpInfo->Flags & AML_NAMED) 616 { 617 /* For nearly all NAMED operators, the name reference is the first child */ 618 619 Path = Op->Asl.Child->Asl.Value.String; 620 if (Op->Asl.AmlOpcode == AML_ALIAS_OP) 621 { 622 /* 623 * ALIAS is the only oddball opcode, the name declaration 624 * (alias name) is the second operand 625 */ 626 Path = Op->Asl.Child->Asl.Next->Asl.Value.String; 627 } 628 } 629 else if (OpInfo->Flags & AML_CREATE) 630 { 631 /* Name must appear as the last parameter */ 632 633 NextOp = Op->Asl.Child; 634 while (!(NextOp->Asl.CompileFlags & OP_IS_NAME_DECLARATION)) 635 { 636 NextOp = NextOp->Asl.Next; 637 } 638 639 Path = NextOp->Asl.Value.String; 640 } 641 else 642 { 643 Path = Op->Asl.Value.String; 644 } 645 646 ObjectType = AslMapNamedOpcodeToDataType (Op->Asl.AmlOpcode); 647 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, 648 "Type=%s\n", AcpiUtGetTypeName (ObjectType))); 649 650 /* 651 * Lookup the name in the namespace. Name must exist at this point, or it 652 * is an invalid reference. 653 * 654 * The namespace is also used as a lookup table for references to resource 655 * descriptors and the fields within them. 656 */ 657 AslGbl_NsLookupCount++; 658 659 Status = AcpiNsLookup (WalkState->ScopeInfo, Path, ObjectType, 660 ACPI_IMODE_EXECUTE, Flags, WalkState, &Node); 661 if (ACPI_FAILURE (Status)) 662 { 663 if (Status == AE_NOT_FOUND) 664 { 665 /* 666 * We didn't find the name reference by path -- we can qualify this 667 * a little better before we print an error message 668 */ 669 670 if ((Op->Asl.Parent) && 671 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_CONDREFOF)) 672 { 673 /* 674 * One special case: CondRefOf operator - if the name doesn't 675 * exist at this point, it means that there's no actual or 676 * external declaration. If the name is not found, just ignore 677 * it, the point of the operator is to determine if the name 678 * exists at runtime. We wanted to see if this named object 679 * exists to facilitate analysis to allow protected usage of 680 * undeclared externals. 681 */ 682 return_ACPI_STATUS (AE_OK); 683 } 684 else if (strlen (Path) == ACPI_NAMESEG_SIZE) 685 { 686 /* A simple, one-segment ACPI name */ 687 688 if (XfObjectExists (Path)) 689 { 690 /* 691 * There exists such a name, but we couldn't get to it 692 * from this scope 693 */ 694 AslError (ASL_ERROR, ASL_MSG_NOT_REACHABLE, Op, 695 Op->Asl.ExternalName); 696 } 697 else 698 { 699 /* The name doesn't exist, period */ 700 701 AslError (ASL_ERROR, ASL_MSG_NOT_EXIST, 702 Op, Op->Asl.ExternalName); 703 } 704 } 705 else 706 { 707 /* The NamePath contains multiple NameSegs */ 708 709 if ((OpInfo->Flags & AML_CREATE) || 710 (OpInfo->ObjectType == ACPI_TYPE_LOCAL_ALIAS)) 711 { 712 /* 713 * The new name is the last parameter. For the 714 * CreateXXXXField and Alias operators 715 */ 716 NextOp = Op->Asl.Child; 717 while (!(NextOp->Asl.CompileFlags & OP_IS_NAME_DECLARATION)) 718 { 719 NextOp = NextOp->Asl.Next; 720 } 721 722 AslError (ASL_ERROR, ASL_MSG_PREFIX_NOT_EXIST, NextOp, 723 NextOp->Asl.ExternalName); 724 } 725 else if (OpInfo->Flags & AML_NAMED) 726 { 727 /* The new name is the first parameter */ 728 729 AslError (ASL_ERROR, ASL_MSG_PREFIX_NOT_EXIST, Op, 730 Op->Asl.ExternalName); 731 } 732 else if (Path[0] == AML_ROOT_PREFIX) 733 { 734 /* Full namepath from root, the object does not exist */ 735 736 AslError (ASL_ERROR, ASL_MSG_NOT_EXIST, Op, 737 Op->Asl.ExternalName); 738 } 739 else 740 { 741 /* 742 * Generic "not found" error. Cannot determine whether it 743 * doesn't exist or just can't be reached. However, we 744 * can differentiate between a NameSeg vs. NamePath. 745 */ 746 if (strlen (Op->Asl.ExternalName) == ACPI_NAMESEG_SIZE) 747 { 748 AslError (ASL_ERROR, ASL_MSG_NOT_FOUND, Op, 749 Op->Asl.ExternalName); 750 } 751 else 752 { 753 AslError (ASL_ERROR, ASL_MSG_NAMEPATH_NOT_EXIST, Op, 754 Op->Asl.ExternalName); 755 } 756 } 757 } 758 759 Status = AE_OK; 760 } 761 762 return_ACPI_STATUS (Status); 763 } 764 765 /* Check for an attempt to access an object in another method */ 766 767 if (!XfValidateCrossReference (Op, OpInfo, Node)) 768 { 769 AslError (ASL_ERROR, ASL_MSG_TEMPORARY_OBJECT, Op, 770 Op->Asl.ExternalName); 771 return_ACPI_STATUS (Status); 772 } 773 774 /* Object was found above, check for an illegal forward reference */ 775 776 if (Op->Asl.CompileFlags & OP_NOT_FOUND_DURING_LOAD) 777 { 778 /* 779 * During the load phase, this Op was flagged as a possible 780 * illegal forward reference. In other words, Op is a name path or 781 * name segment that refers to a named object declared after the 782 * reference. In this scinario, Node refers to the actual declaration 783 * and Op is a parse node that references the named object. 784 * 785 * Note: 786 * 787 * Object references inside of control methods are allowed to 788 * refer to objects declared outside of control methods. 789 * 790 * If the declaration and reference are both contained inside of the 791 * same method or outside of any method, this is a forward reference 792 * and should be reported as a compiler error. 793 */ 794 DeclarationParentMethod = UtGetParentMethodNode (Node); 795 ReferenceParentMethod = UtGetParentMethodOp (Op); 796 797 /* case 1: declaration and reference are both outside of method */ 798 799 if (!ReferenceParentMethod && !DeclarationParentMethod) 800 { 801 AslError (ASL_ERROR, ASL_MSG_ILLEGAL_FORWARD_REF, Op, 802 Op->Asl.ExternalName); 803 } 804 805 /* case 2: declaration and reference are both inside of the same method */ 806 807 else if (ReferenceParentMethod && DeclarationParentMethod && 808 ReferenceParentMethod == DeclarationParentMethod->Op) 809 { 810 AslError (ASL_ERROR, ASL_MSG_ILLEGAL_FORWARD_REF, Op, 811 Op->Asl.ExternalName); 812 } 813 } 814 815 /* Check for a reference vs. name declaration */ 816 817 if (!(OpInfo->Flags & AML_NAMED) && 818 !(OpInfo->Flags & AML_CREATE)) 819 { 820 /* This node has been referenced, mark it for reference check */ 821 822 Node->Flags |= ANOBJ_IS_REFERENCED; 823 } 824 825 /* 826 * Attempt to optimize the NamePath 827 * 828 * One special case: CondRefOf operator - not all AML interpreter 829 * implementations expect optimized namepaths as a parameter to this 830 * operator. They require relative name paths with prefix operators or 831 * namepaths starting with the root scope. 832 * 833 * Other AML interpreter implementations do not perform the namespace 834 * search that starts at the current scope and recursively searching the 835 * parent scope until the root scope. The lack of search is only known to 836 * occur for the namestring parameter for the CondRefOf operator. 837 */ 838 if ((Op->Asl.Parent) && 839 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_CONDREFOF)) 840 { 841 OptOptimizeNamePath (Op, OpInfo->Flags, WalkState, Path, Node); 842 } 843 844 /* 845 * 1) Dereference an alias (A name reference that is an alias) 846 * Aliases are not nested, the alias always points to the final object 847 */ 848 if ((Op->Asl.ParseOpcode != PARSEOP_ALIAS) && 849 (Node->Type == ACPI_TYPE_LOCAL_ALIAS)) 850 { 851 /* This node points back to the original PARSEOP_ALIAS */ 852 853 NextOp = Node->Op; 854 855 /* The first child is the alias target op */ 856 857 NextOp = NextOp->Asl.Child; 858 859 /* That in turn points back to original target alias node */ 860 861 if (NextOp->Asl.Node) 862 { 863 Node = NextOp->Asl.Node; 864 } 865 866 /* Else - forward reference to alias, will be resolved later */ 867 } 868 869 /* 2) Check for a reference to a resource descriptor */ 870 871 if ((Node->Type == ACPI_TYPE_LOCAL_RESOURCE_FIELD) || 872 (Node->Type == ACPI_TYPE_LOCAL_RESOURCE)) 873 { 874 /* 875 * This was a reference to a field within a resource descriptor. 876 * Extract the associated field offset (either a bit or byte 877 * offset depending on the field type) and change the named 878 * reference into an integer for AML code generation 879 */ 880 Offset = Node->Value; 881 TagBitLength = Node->Length; 882 883 /* 884 * If a field is being created, generate the length (in bits) of 885 * the field. Note: Opcodes other than CreateXxxField and Index 886 * can come through here. For other opcodes, we just need to 887 * convert the resource tag reference to an integer offset. 888 */ 889 switch (Op->Asl.Parent->Asl.AmlOpcode) 890 { 891 case AML_CREATE_FIELD_OP: /* Variable "Length" field, in bits */ 892 /* 893 * We know the length operand is an integer constant because 894 * we know that it contains a reference to a resource 895 * descriptor tag. 896 */ 897 FieldBitLength = (UINT32) Op->Asl.Next->Asl.Value.Integer; 898 break; 899 900 case AML_CREATE_BIT_FIELD_OP: 901 902 FieldBitLength = 1; 903 break; 904 905 case AML_CREATE_BYTE_FIELD_OP: 906 case AML_INDEX_OP: 907 908 FieldBitLength = 8; 909 break; 910 911 case AML_CREATE_WORD_FIELD_OP: 912 913 FieldBitLength = 16; 914 break; 915 916 case AML_CREATE_DWORD_FIELD_OP: 917 918 FieldBitLength = 32; 919 break; 920 921 case AML_CREATE_QWORD_FIELD_OP: 922 923 FieldBitLength = 64; 924 break; 925 926 default: 927 928 FieldBitLength = 0; 929 break; 930 } 931 932 /* Check the field length against the length of the resource tag */ 933 934 if (FieldBitLength) 935 { 936 if (TagBitLength < FieldBitLength) 937 { 938 Message = ASL_MSG_TAG_SMALLER; 939 } 940 else if (TagBitLength > FieldBitLength) 941 { 942 Message = ASL_MSG_TAG_LARGER; 943 } 944 945 if (Message) 946 { 947 sprintf (AslGbl_MsgBuffer, 948 "Size mismatch, Tag: %u bit%s, Field: %u bit%s", 949 TagBitLength, (TagBitLength > 1) ? "s" : "", 950 FieldBitLength, (FieldBitLength > 1) ? "s" : ""); 951 952 AslError (ASL_WARNING, Message, Op, AslGbl_MsgBuffer); 953 } 954 } 955 956 /* Convert the BitOffset to a ByteOffset for certain opcodes */ 957 958 switch (Op->Asl.Parent->Asl.AmlOpcode) 959 { 960 case AML_CREATE_BYTE_FIELD_OP: 961 case AML_CREATE_WORD_FIELD_OP: 962 case AML_CREATE_DWORD_FIELD_OP: 963 case AML_CREATE_QWORD_FIELD_OP: 964 case AML_INDEX_OP: 965 966 Offset = ACPI_DIV_8 (Offset); 967 break; 968 969 default: 970 971 break; 972 } 973 974 /* Now convert this node to an integer whose value is the field offset */ 975 976 Op->Asl.AmlLength = 0; 977 Op->Asl.ParseOpcode = PARSEOP_INTEGER; 978 Op->Asl.Value.Integer = (UINT64) Offset; 979 Op->Asl.CompileFlags |= OP_IS_RESOURCE_FIELD; 980 981 OpcGenerateAmlOpcode (Op); 982 } 983 984 /* 3) Check for a method invocation */ 985 986 else if ((((Op->Asl.ParseOpcode == PARSEOP_NAMESTRING) || (Op->Asl.ParseOpcode == PARSEOP_NAMESEG)) && 987 (Node->Type == ACPI_TYPE_METHOD) && 988 (Op->Asl.Parent) && 989 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_METHOD)) || 990 991 (Op->Asl.ParseOpcode == PARSEOP_METHODCALL)) 992 { 993 /* 994 * A reference to a method within one of these opcodes is not an 995 * invocation of the method, it is simply a reference to the method. 996 * 997 * September 2016: Removed DeRefOf from this list 998 * July 2020: Added Alias to this list 999 */ 1000 if ((Op->Asl.Parent) && 1001 ((Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_REFOF) || 1002 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_PACKAGE) || 1003 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_VAR_PACKAGE)|| 1004 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_OBJECTTYPE) || 1005 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_ALIAS))) 1006 { 1007 return_ACPI_STATUS (AE_OK); 1008 } 1009 1010 /* 1011 * There are two types of method invocation: 1012 * 1) Invocation with arguments -- the parser recognizes this 1013 * as a METHODCALL. 1014 * 2) Invocation with no arguments --the parser cannot determine that 1015 * this is a method invocation, therefore we have to figure it out 1016 * here. 1017 */ 1018 if (Node->Type != ACPI_TYPE_METHOD) 1019 { 1020 sprintf (AslGbl_MsgBuffer, "%s is a %s", 1021 Op->Asl.ExternalName, AcpiUtGetTypeName (Node->Type)); 1022 1023 AslError (ASL_ERROR, ASL_MSG_NOT_METHOD, Op, AslGbl_MsgBuffer); 1024 return_ACPI_STATUS (AE_OK); 1025 } 1026 1027 /* Save the method node in the caller's op */ 1028 1029 Op->Asl.Node = Node; 1030 if (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_CONDREFOF) 1031 { 1032 return_ACPI_STATUS (AE_OK); 1033 } 1034 1035 /* 1036 * This is a method invocation, with or without arguments. 1037 * Count the number of arguments, each appears as a child 1038 * under the parent node 1039 */ 1040 Op->Asl.ParseOpcode = PARSEOP_METHODCALL; 1041 UtSetParseOpName (Op); 1042 1043 PassedArgs = 0; 1044 NextOp = Op->Asl.Child; 1045 1046 while (NextOp) 1047 { 1048 PassedArgs++; 1049 NextOp = NextOp->Asl.Next; 1050 } 1051 1052 if (Node->Value != ASL_EXTERNAL_METHOD_UNKNOWN_PARAMS && 1053 Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_EXTERNAL) 1054 { 1055 /* 1056 * Check the parsed arguments with the number expected by the 1057 * method declaration itself 1058 */ 1059 if (PassedArgs != Node->Value) 1060 { 1061 if (Node->Flags & ANOBJ_IS_EXTERNAL) 1062 { 1063 sprintf (AslGbl_MsgBuffer, 1064 "according to previous use, %s requires %u", 1065 Op->Asl.ExternalName, Node->Value); 1066 } 1067 else 1068 { 1069 sprintf (AslGbl_MsgBuffer, "%s requires %u", Op->Asl.ExternalName, 1070 Node->Value); 1071 } 1072 1073 if (PassedArgs < Node->Value) 1074 { 1075 AslError (ASL_ERROR, ASL_MSG_ARG_COUNT_LO, Op, AslGbl_MsgBuffer); 1076 } 1077 else 1078 { 1079 AslError (ASL_ERROR, ASL_MSG_ARG_COUNT_HI, Op, AslGbl_MsgBuffer); 1080 } 1081 } 1082 } 1083 1084 /* 1085 * At this point, a method call to an external method has been 1086 * detected. As of 11/19/2019, iASL does not support parameter counts 1087 * for methods declared as external. Therefore, save the parameter 1088 * count of the first method call and use this count check other 1089 * method calls to ensure that the methods are being called with the 1090 * same amount of parameters. 1091 */ 1092 else if (Node->Type == ACPI_TYPE_METHOD && 1093 (Node->Flags & ANOBJ_IS_EXTERNAL) && 1094 Node->Value == ASL_EXTERNAL_METHOD_UNKNOWN_PARAMS && 1095 Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_EXTERNAL) 1096 { 1097 Node->Value = PassedArgs; 1098 } 1099 } 1100 1101 /* 4) Check for an ASL Field definition */ 1102 1103 else if ((Op->Asl.Parent) && 1104 ((Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_FIELD) || 1105 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_BANKFIELD))) 1106 { 1107 /* 1108 * Offset checking for fields. If the parent operation region has a 1109 * constant length (known at compile time), we can check fields 1110 * defined in that region against the region length. This will catch 1111 * fields and field units that cannot possibly fit within the region. 1112 * 1113 * Note: Index fields do not directly reference an operation region, 1114 * thus they are not included in this check. 1115 */ 1116 if (Op == Op->Asl.Parent->Asl.Child) 1117 { 1118 /* 1119 * This is the first child of the field node, which is 1120 * the name of the region. Get the parse node for the 1121 * region -- which contains the length of the region. 1122 */ 1123 OwningOp = Node->Op; 1124 Op->Asl.Parent->Asl.ExtraValue = 1125 ACPI_MUL_8 ((UINT32) OwningOp->Asl.Value.Integer); 1126 1127 /* Examine the field access width */ 1128 1129 switch ((UINT8) Op->Asl.Parent->Asl.Value.Integer) 1130 { 1131 case AML_FIELD_ACCESS_ANY: 1132 case AML_FIELD_ACCESS_BYTE: 1133 case AML_FIELD_ACCESS_BUFFER: 1134 default: 1135 1136 MinimumLength = 1; 1137 break; 1138 1139 case AML_FIELD_ACCESS_WORD: 1140 1141 MinimumLength = 2; 1142 break; 1143 1144 case AML_FIELD_ACCESS_DWORD: 1145 1146 MinimumLength = 4; 1147 break; 1148 1149 case AML_FIELD_ACCESS_QWORD: 1150 1151 MinimumLength = 8; 1152 break; 1153 } 1154 1155 /* 1156 * Is the region at least as big as the access width? 1157 * Note: DataTableRegions have 0 length 1158 */ 1159 if (((UINT32) OwningOp->Asl.Value.Integer) && 1160 ((UINT32) OwningOp->Asl.Value.Integer < MinimumLength)) 1161 { 1162 AslError (ASL_ERROR, ASL_MSG_FIELD_ACCESS_WIDTH, Op, NULL); 1163 } 1164 1165 /* 1166 * Check EC/CMOS/SMBUS fields to make sure that the correct 1167 * access type is used (BYTE for EC/CMOS, BUFFER for SMBUS) 1168 */ 1169 SpaceIdOp = OwningOp->Asl.Child->Asl.Next; 1170 switch ((UINT32) SpaceIdOp->Asl.Value.Integer) 1171 { 1172 case ACPI_ADR_SPACE_EC: 1173 case ACPI_ADR_SPACE_CMOS: 1174 case ACPI_ADR_SPACE_GPIO: 1175 1176 if ((UINT8) Op->Asl.Parent->Asl.Value.Integer != 1177 AML_FIELD_ACCESS_BYTE) 1178 { 1179 AslError (ASL_ERROR, ASL_MSG_REGION_BYTE_ACCESS, Op, NULL); 1180 } 1181 break; 1182 1183 case ACPI_ADR_SPACE_SMBUS: 1184 case ACPI_ADR_SPACE_IPMI: 1185 case ACPI_ADR_SPACE_GSBUS: 1186 1187 if ((UINT8) Op->Asl.Parent->Asl.Value.Integer != 1188 AML_FIELD_ACCESS_BUFFER) 1189 { 1190 AslError (ASL_ERROR, ASL_MSG_REGION_BUFFER_ACCESS, Op, NULL); 1191 } 1192 break; 1193 1194 default: 1195 1196 /* Nothing to do for other address spaces */ 1197 1198 break; 1199 } 1200 } 1201 else 1202 { 1203 /* 1204 * This is one element of the field list. Check to make sure 1205 * that it does not go beyond the end of the parent operation region. 1206 * 1207 * In the code below: 1208 * Op->Asl.Parent->Asl.ExtraValue - Region Length (bits) 1209 * Op->Asl.ExtraValue - Field start offset (bits) 1210 * Op->Asl.Child->Asl.Value.Integer32 - Field length (bits) 1211 * Op->Asl.Child->Asl.ExtraValue - Field access width (bits) 1212 */ 1213 if (Op->Asl.Parent->Asl.ExtraValue && Op->Asl.Child) 1214 { 1215 XfCheckFieldRange (Op, 1216 Op->Asl.Parent->Asl.ExtraValue, 1217 Op->Asl.ExtraValue, 1218 (UINT32) Op->Asl.Child->Asl.Value.Integer, 1219 Op->Asl.Child->Asl.ExtraValue); 1220 } 1221 } 1222 } 1223 1224 /* 1225 * 5) Check for external resolution 1226 * 1227 * By this point, everything should be loaded in the namespace. If a 1228 * namespace lookup results in a namespace node that is an external, it 1229 * means that this named object was not defined in the input ASL. This 1230 * causes issues because there are plenty of incidents where developers 1231 * use the external keyword to suppress compiler errors about undefined 1232 * objects. Note: this only applies when compiling multiple definition 1233 * blocks. 1234 * 1235 * Do not check for external resolution in the following cases: 1236 * 1237 * case 1) External (ABCD) 1238 * 1239 * This declares ABCD as an external so there is no requirement for 1240 * ABCD to be loaded in the namespace when analyzing the actual 1241 * External() statement. 1242 * 1243 * case 2) CondRefOf (ABCD) 1244 * 1245 * This operator will query the ACPI namespace on the existence of 1246 * ABCD. If ABCD does not exist, this operator will return a 0 1247 * without incurring AML runtime errors. Therefore, ABCD is allowed 1248 * to not exist when analyzing the CondRefOf operator. 1249 * 1250 * case 3) External (ABCD) 1251 * if (CondRefOf (ABCD)) 1252 * { 1253 * Store (0, ABCD) 1254 * } 1255 * 1256 * In this case, ABCD is accessed only if it exists due to the if 1257 * statement so there is no need to flag the ABCD nested in the 1258 * store operator. 1259 */ 1260 if (AslGbl_ParseTreeRoot->Asl.Child && AslGbl_ParseTreeRoot->Asl.Child->Asl.Next && 1261 (Node->Flags & ANOBJ_IS_EXTERNAL) && 1262 Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_EXTERNAL && 1263 Op->Asl.ParseOpcode != PARSEOP_EXTERNAL && 1264 Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_CONDREFOF && 1265 !XfRefIsGuardedByIfCondRefOf (Node, Op)) 1266 { 1267 ExternalPath = AcpiNsGetNormalizedPathname (Node, TRUE); 1268 sprintf (AslGbl_MsgBuffer, "full path of external object: %s", 1269 ExternalPath); 1270 AslDualParseOpError (ASL_ERROR, ASL_MSG_UNDEFINED_EXTERNAL, Op, NULL, 1271 ASL_MSG_EXTERNAL_FOUND_HERE, Node->Op, AslGbl_MsgBuffer); 1272 if (ExternalPath) 1273 { 1274 ACPI_FREE (ExternalPath); 1275 } 1276 } 1277 1278 /* 5) Check for a connection object */ 1279#if 0 1280 else if (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_CONNECTION) 1281 { 1282 return_ACPI_STATUS (Status); 1283 } 1284#endif 1285 1286 Op->Asl.Node = Node; 1287 return_ACPI_STATUS (Status); 1288} 1289 1290 1291/******************************************************************************* 1292 * 1293 * FUNCTION: XfRefIsGuardedByIfCondRefOf 1294 * 1295 * PARAMETERS: Node - Named object reference node 1296 * Op - Named object reference parse node 1297 * 1298 * RETURN: BOOLEAN 1299 * 1300 * DESCRIPTION: returns true if Op checked inside if (CondRefOf (...)) 1301 * refers to Node. 1302 * 1303 ******************************************************************************/ 1304 1305static BOOLEAN 1306XfRefIsGuardedByIfCondRefOf ( 1307 ACPI_NAMESPACE_NODE *Node, 1308 ACPI_PARSE_OBJECT *Op) 1309{ 1310 ACPI_PARSE_OBJECT *Parent = Op->Asl.Parent; 1311 1312 1313 while (Parent) 1314 { 1315 if (Parent->Asl.ParseOpcode == PARSEOP_IF && 1316 XfFindCondRefOfName (Node, Parent->Asl.Child)) 1317 { 1318 return (TRUE); 1319 } 1320 1321 Parent = Parent->Asl.Parent; 1322 } 1323 1324 return (FALSE); 1325} 1326 1327 1328/******************************************************************************* 1329 * 1330 * FUNCTION: XfRefIsGuardedByIfCondRefOf 1331 * 1332 * PARAMETERS: Node - Named object reference node 1333 * Op - Named object reference parse node 1334 * 1335 * RETURN: BOOLEAN 1336 * 1337 * DESCRIPTION: returns true if Op checked inside if (CondRefOf (...)) 1338 * refers to Node. 1339 * 1340 ******************************************************************************/ 1341 1342static BOOLEAN 1343XfFindCondRefOfName ( 1344 ACPI_NAMESPACE_NODE *Node, 1345 ACPI_PARSE_OBJECT *Op) 1346{ 1347 BOOLEAN CondRefOfFound = FALSE; 1348 1349 1350 if (!Op) 1351 { 1352 return (FALSE); 1353 } 1354 1355 switch (Op->Asl.ParseOpcode) 1356 { 1357 case PARSEOP_CONDREFOF: 1358 1359 return (Op->Asl.Child->Common.Node == Node); 1360 break; 1361 1362 case PARSEOP_LAND: 1363 1364 CondRefOfFound = XfFindCondRefOfName (Node, Op->Asl.Child); 1365 if (CondRefOfFound) 1366 { 1367 return (TRUE); 1368 } 1369 1370 return (XfFindCondRefOfName (Node, Op->Asl.Child->Asl.Next)); 1371 break; 1372 1373 default: 1374 1375 return (FALSE); 1376 break; 1377 } 1378} 1379 1380 1381/******************************************************************************* 1382 * 1383 * FUNCTION: XfNamespaceLocateEnd 1384 * 1385 * PARAMETERS: ASL_WALK_CALLBACK 1386 * 1387 * RETURN: Status 1388 * 1389 * DESCRIPTION: Ascending callback used during cross reference. We only 1390 * need to worry about scope management here. 1391 * 1392 ******************************************************************************/ 1393 1394static ACPI_STATUS 1395XfNamespaceLocateEnd ( 1396 ACPI_PARSE_OBJECT *Op, 1397 UINT32 Level, 1398 void *Context) 1399{ 1400 ACPI_WALK_STATE *WalkState = (ACPI_WALK_STATE *) Context; 1401 const ACPI_OPCODE_INFO *OpInfo; 1402 1403 1404 ACPI_FUNCTION_TRACE (XfNamespaceLocateEnd); 1405 1406 1407 /* We are only interested in opcodes that have an associated name */ 1408 1409 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode); 1410 if (!(OpInfo->Flags & AML_NAMED)) 1411 { 1412 return_ACPI_STATUS (AE_OK); 1413 } 1414 1415 /* Not interested in name references, we did not open a scope for them */ 1416 1417 if ((Op->Asl.ParseOpcode == PARSEOP_NAMESTRING) || 1418 (Op->Asl.ParseOpcode == PARSEOP_NAMESEG) || 1419 (Op->Asl.ParseOpcode == PARSEOP_METHODCALL) || 1420 (Op->Asl.ParseOpcode == PARSEOP_EXTERNAL)) 1421 { 1422 return_ACPI_STATUS (AE_OK); 1423 } 1424 1425 /* Pop the scope stack if necessary */ 1426 1427 if (AcpiNsOpensScope (AslMapNamedOpcodeToDataType (Op->Asl.AmlOpcode))) 1428 { 1429 1430 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, 1431 "%s: Popping scope for Op %p\n", 1432 AcpiUtGetTypeName (OpInfo->ObjectType), Op)); 1433 1434 (void) AcpiDsScopeStackPop (WalkState); 1435 } 1436 1437 return_ACPI_STATUS (AE_OK); 1438} 1439 1440 1441/******************************************************************************* 1442 * 1443 * FUNCTION: XfValidateCrossReference 1444 * 1445 * PARAMETERS: Op - Parse Op that references the object 1446 * OpInfo - Parse Op info struct 1447 * Node - Node for the referenced object 1448 * 1449 * RETURN: TRUE if the reference is legal, FALSE otherwise 1450 * 1451 * DESCRIPTION: Determine if a reference to another object is allowed. 1452 * 1453 * EXAMPLE: 1454 * Method (A) {Name (INT1, 1)} Declaration of object INT1 1455 * Method (B) (Store (2, \A.INT1)} Illegal reference to object INT1 1456 * (INT1 is temporary, valid only during 1457 * execution of A) 1458 * 1459 * NOTES: 1460 * A null pointer returned by either UtGetParentMethodOp or 1461 * UtGetParentMethodNode indicates that the parameter object is not 1462 * within a control method. 1463 * 1464 * Five cases are handled: Case(Op, Node) 1465 * 1) Case(0,0): Op is not within a method, Node is not --> OK 1466 * 2) Case(0,1): Op is not within a method, but Node is --> Illegal 1467 * 3) Case(1,0): Op is within a method, Node is not --> OK 1468 * 4) Case(1,1): Both are within the same method --> OK 1469 * 5) Case(1,1): Both are in methods, but not same method --> Illegal 1470 * 1471 ******************************************************************************/ 1472 1473static BOOLEAN 1474XfValidateCrossReference ( 1475 ACPI_PARSE_OBJECT *Op, 1476 const ACPI_OPCODE_INFO *OpInfo, 1477 ACPI_NAMESPACE_NODE *Node) 1478{ 1479 ACPI_PARSE_OBJECT *ReferencingMethodOp; 1480 ACPI_NAMESPACE_NODE *ReferencedMethodNode; 1481 1482 1483 /* Ignore actual named (and related) object declarations */ 1484 1485 if (OpInfo->Flags & (AML_NAMED | AML_CREATE | AML_DEFER | AML_HAS_ARGS)) 1486 { 1487 return (TRUE); 1488 } 1489 1490 /* 1491 * 1) Search upwards in parse tree for owner of the referencing object 1492 * 2) Search upwards in namespace to find the owner of the referenced object 1493 */ 1494 ReferencingMethodOp = UtGetParentMethodOp (Op); 1495 ReferencedMethodNode = UtGetParentMethodNode (Node); 1496 1497 if (!ReferencingMethodOp && !ReferencedMethodNode) 1498 { 1499 /* 1500 * 1) Case (0,0): Both Op and Node are not within methods 1501 * --> OK 1502 */ 1503 return (TRUE); 1504 } 1505 1506 if (!ReferencingMethodOp && ReferencedMethodNode) 1507 { 1508 /* 1509 * 2) Case (0,1): Op is not in a method, but Node is within a 1510 * method --> illegal 1511 */ 1512 return (FALSE); 1513 } 1514 else if (ReferencingMethodOp && !ReferencedMethodNode) 1515 { 1516 /* 1517 * 3) Case (1,0): Op is within a method, but Node is not 1518 * --> OK 1519 */ 1520 return (TRUE); 1521 } 1522 else if (ReferencingMethodOp->Asl.Node == ReferencedMethodNode) 1523 { 1524 /* 1525 * 4) Case (1,1): Both Op and Node are within the same method 1526 * --> OK 1527 */ 1528 return (TRUE); 1529 } 1530 else 1531 { 1532 /* 1533 * 5) Case (1,1), Op and Node are in different methods 1534 * --> Illegal 1535 */ 1536 return (FALSE); 1537 } 1538} 1539