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 */ 164 165 static ACPI_STATUS 166 XfNamespaceLocateBegin ( 167 ACPI_PARSE_OBJECT *Op, 168 UINT32 Level, 169 void *Context); 170 171 static ACPI_STATUS 172 XfNamespaceLocateEnd ( 173 ACPI_PARSE_OBJECT *Op, 174 UINT32 Level, 175 void *Context); 176 177 static BOOLEAN 178 XfValidateCrossReference ( 179 ACPI_PARSE_OBJECT *Op, 180 const ACPI_OPCODE_INFO *OpInfo, 181 ACPI_NAMESPACE_NODE *Node); 182 183 static BOOLEAN 184 XfObjectExists ( 185 char *Name); 186 187 static ACPI_STATUS 188 XfCompareOneNamespaceObject ( 189 ACPI_HANDLE ObjHandle, 190 UINT32 Level, 191 void *Context, 192 void **ReturnValue); 193 194 static void 195 XfCheckFieldRange ( 196 ACPI_PARSE_OBJECT *Op, 197 UINT32 RegionBitLength, 198 UINT32 FieldBitOffset, 199 UINT32 FieldBitLength, 200 UINT32 AccessBitWidth); 201 202 static BOOLEAN 203 XfFindCondRefOfName ( 204 ACPI_NAMESPACE_NODE *Node, 205 ACPI_PARSE_OBJECT *Op); 206 207 static BOOLEAN 208 XfRefIsGuardedByIfCondRefOf ( 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 ******************************************************************************/ 232 233 ACPI_STATUS 234 XfCrossReferenceNamespace ( 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 ******************************************************************************/ 271 272 static BOOLEAN 273 XfObjectExists ( 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 ******************************************************************************/ 306 307 static ACPI_STATUS 308 XfCompareOneNamespaceObject ( 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 ******************************************************************************/ 347 348 static void 349 XfCheckFieldRange ( 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 ******************************************************************************/ 407 408 static ACPI_STATUS 409 XfNamespaceLocateBegin ( 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; 436 437 438 ACPI_FUNCTION_TRACE_PTR (XfNamespaceLocateBegin, Op); 439 440 441 if ((Op->Asl.AmlOpcode == AML_METHOD_OP) && Op->Asl.Node) 442 { 443 Node = Op->Asl.Node; 444 445 /* Support for method LocalX/ArgX analysis */ 446 447 if (!Node->MethodLocals) 448 { 449 /* Create local/arg info blocks */ 450 451 MethodLocals = UtLocalCalloc ( 452 sizeof (ASL_METHOD_LOCAL) * ACPI_METHOD_NUM_LOCALS); 453 Node->MethodLocals = MethodLocals; 454 455 MethodArgs = UtLocalCalloc ( 456 sizeof (ASL_METHOD_LOCAL) * ACPI_METHOD_NUM_ARGS); 457 Node->MethodArgs = MethodArgs; 458 459 /* 460 * Get the method argument count 461 * First, get the name node 462 */ 463 NextOp = Op->Asl.Child; 464 465 /* Get the NumArguments node */ 466 467 NextOp = NextOp->Asl.Next; 468 Node->ArgCount = (UINT8) 469 (((UINT8) NextOp->Asl.Value.Integer) & 0x07); 470 471 /* We will track all possible ArgXs */ 472 473 for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++) 474 { 475 if (i < Node->ArgCount) 476 { 477 /* Real Args are always "initialized" */ 478 479 MethodArgs[i].Flags = ASL_ARG_INITIALIZED; 480 } 481 else 482 { 483 /* Other ArgXs can be used as locals */ 484 485 MethodArgs[i].Flags = ASL_ARG_IS_LOCAL; 486 } 487 488 MethodArgs[i].Op = Op; 489 } 490 } 491 } 492 493 /* 494 * If this node is the actual declaration of a name 495 * [such as the XXXX name in "Method (XXXX)"], 496 * we are not interested in it here. We only care about names that are 497 * references to other objects within the namespace and the parent objects 498 * of name declarations 499 */ 500 if (Op->Asl.CompileFlags & OP_IS_NAME_DECLARATION) 501 { 502 return_ACPI_STATUS (AE_OK); 503 } 504 505 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode); 506 507 /* Check method LocalX variables */ 508 509 if (OpInfo->Type == AML_TYPE_LOCAL_VARIABLE) 510 { 511 /* Find parent method Op */ 512 513 NextOp = UtGetParentMethodOp (Op); 514 if (!NextOp) 515 { 516 return_ACPI_STATUS (AE_OK); 517 } 518 519 /* Get method node */ 520 521 Node = NextOp->Asl.Node; 522 523 RegisterNumber = Op->Asl.AmlOpcode & 0x0007; /* 0x60 through 0x67 */ 524 MethodLocals = Node->MethodLocals; 525 526 if (Op->Asl.CompileFlags & OP_IS_TARGET) 527 { 528 /* Local is being initialized */ 529 530 MethodLocals[RegisterNumber].Flags |= ASL_LOCAL_INITIALIZED; 531 MethodLocals[RegisterNumber].Op = Op; 532 533 return_ACPI_STATUS (AE_OK); 534 } 535 536 /* Mark this Local as referenced */ 537 538 MethodLocals[RegisterNumber].Flags |= ASL_LOCAL_REFERENCED; 539 MethodLocals[RegisterNumber].Op = Op; 540 541 return_ACPI_STATUS (AE_OK); 542 } 543 544 /* Check method ArgX variables */ 545 546 if (OpInfo->Type == AML_TYPE_METHOD_ARGUMENT) 547 { 548 /* Find parent method Op */ 549 550 NextOp = UtGetParentMethodOp (Op); 551 if (!NextOp) 552 { 553 return_ACPI_STATUS (AE_OK); 554 } 555 556 /* Get method node */ 557 558 Node = NextOp->Asl.Node; 559 560 /* Get Arg # */ 561 562 RegisterNumber = Op->Asl.AmlOpcode - AML_ARG0; /* 0x68 through 0x6F */ 563 MethodArgs = Node->MethodArgs; 564 565 /* Mark this Arg as referenced */ 566 567 MethodArgs[RegisterNumber].Flags |= ASL_ARG_REFERENCED; 568 MethodArgs[RegisterNumber].Op = Op; 569 570 if (Op->Asl.CompileFlags & OP_IS_TARGET) 571 { 572 /* Arg is being initialized */ 573 574 MethodArgs[RegisterNumber].Flags |= ASL_ARG_INITIALIZED; 575 } 576 577 return_ACPI_STATUS (AE_OK); 578 } 579 580 /* 581 * After method ArgX and LocalX, we are only interested in opcodes 582 * that have an associated name 583 */ 584 if ((!(OpInfo->Flags & AML_NAMED)) && 585 (!(OpInfo->Flags & AML_CREATE)) && 586 (Op->Asl.ParseOpcode != PARSEOP_NAMESTRING) && 587 (Op->Asl.ParseOpcode != PARSEOP_NAMESEG) && 588 (Op->Asl.ParseOpcode != PARSEOP_METHODCALL) && 589 (Op->Asl.ParseOpcode != PARSEOP_EXTERNAL)) 590 { 591 return_ACPI_STATUS (AE_OK); 592 } 593 594 /* 595 * We must enable the "search-to-root" for single NameSegs, but 596 * we have to be very careful about opening up scopes 597 */ 598 Flags = ACPI_NS_SEARCH_PARENT; 599 if ((Op->Asl.ParseOpcode == PARSEOP_NAMESTRING) || 600 (Op->Asl.ParseOpcode == PARSEOP_NAMESEG) || 601 (Op->Asl.ParseOpcode == PARSEOP_METHODCALL) || 602 (Op->Asl.ParseOpcode == PARSEOP_EXTERNAL) || 603 (Op->Asl.ParseOpcode == PARSEOP_CONDREFOF)) 604 { 605 /* 606 * These are name references, do not push the scope stack 607 * for them. 608 */ 609 Flags |= ACPI_NS_DONT_OPEN_SCOPE; 610 } 611 612 /* Get the NamePath from the appropriate place */ 613 614 if (OpInfo->Flags & AML_NAMED) 615 { 616 /* For nearly all NAMED operators, the name reference is the first child */ 617 618 Path = Op->Asl.Child->Asl.Value.String; 619 if (Op->Asl.AmlOpcode == AML_ALIAS_OP) 620 { 621 /* 622 * ALIAS is the only oddball opcode, the name declaration 623 * (alias name) is the second operand 624 */ 625 Path = Op->Asl.Child->Asl.Next->Asl.Value.String; 626 } 627 } 628 else if (OpInfo->Flags & AML_CREATE) 629 { 630 /* Name must appear as the last parameter */ 631 632 NextOp = Op->Asl.Child; 633 while (!(NextOp->Asl.CompileFlags & OP_IS_NAME_DECLARATION)) 634 { 635 NextOp = NextOp->Asl.Next; 636 } 637 638 Path = NextOp->Asl.Value.String; 639 } 640 else 641 { 642 Path = Op->Asl.Value.String; 643 } 644 645 ObjectType = AslMapNamedOpcodeToDataType (Op->Asl.AmlOpcode); 646 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, 647 "Type=%s\n", AcpiUtGetTypeName (ObjectType))); 648 649 /* 650 * Lookup the name in the namespace. Name must exist at this point, or it 651 * is an invalid reference. 652 * 653 * The namespace is also used as a lookup table for references to resource 654 * descriptors and the fields within them. 655 */ 656 AslGbl_NsLookupCount++; 657 658 Status = AcpiNsLookup (WalkState->ScopeInfo, Path, ObjectType, 659 ACPI_IMODE_EXECUTE, Flags, WalkState, &Node); 660 if (ACPI_FAILURE (Status)) 661 { 662 if (Status == AE_NOT_FOUND) 663 { 664 /* 665 * We didn't find the name reference by path -- we can qualify this 666 * a little better before we print an error message 667 */ 668 669 if ((Op->Asl.Parent) && 670 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_CONDREFOF)) 671 { 672 /* 673 * One special case: CondRefOf operator - if the name doesn't 674 * exist at this point, it means that there's no actual or 675 * external declaration. If the name is not found, just ignore 676 * it, the point of the operator is to determine if the name 677 * exists at runtime. We wanted to see if this named object 678 * exists to facilitate analysis to allow protected usage of 679 * undeclared externals. 680 */ 681 return_ACPI_STATUS (AE_OK); 682 } 683 else if (strlen (Path) == ACPI_NAMESEG_SIZE) 684 { 685 /* A simple, one-segment ACPI name */ 686 687 if (XfObjectExists (Path)) 688 { 689 /* 690 * There exists such a name, but we couldn't get to it 691 * from this scope 692 */ 693 AslError (ASL_ERROR, ASL_MSG_NOT_REACHABLE, Op, 694 Op->Asl.ExternalName); 695 } 696 else 697 { 698 /* The name doesn't exist, period */ 699 700 AslError (ASL_ERROR, ASL_MSG_NOT_EXIST, 701 Op, Op->Asl.ExternalName); 702 } 703 } 704 else 705 { 706 /* The NamePath contains multiple NameSegs */ 707 708 if ((OpInfo->Flags & AML_CREATE) || 709 (OpInfo->ObjectType == ACPI_TYPE_LOCAL_ALIAS)) 710 { 711 /* 712 * The new name is the last parameter. For the 713 * CreateXXXXField and Alias operators 714 */ 715 NextOp = Op->Asl.Child; 716 while (!(NextOp->Asl.CompileFlags & OP_IS_NAME_DECLARATION)) 717 { 718 NextOp = NextOp->Asl.Next; 719 } 720 721 AslError (ASL_ERROR, ASL_MSG_PREFIX_NOT_EXIST, NextOp, 722 NextOp->Asl.ExternalName); 723 } 724 else if (OpInfo->Flags & AML_NAMED) 725 { 726 /* The new name is the first parameter */ 727 728 AslError (ASL_ERROR, ASL_MSG_PREFIX_NOT_EXIST, Op, 729 Op->Asl.ExternalName); 730 } 731 else if (Path[0] == AML_ROOT_PREFIX) 732 { 733 /* Full namepath from root, the object does not exist */ 734 735 AslError (ASL_ERROR, ASL_MSG_NOT_EXIST, Op, 736 Op->Asl.ExternalName); 737 } 738 else 739 { 740 /* 741 * Generic "not found" error. Cannot determine whether it 742 * doesn't exist or just can't be reached. However, we 743 * can differentiate between a NameSeg vs. NamePath. 744 */ 745 if (strlen (Op->Asl.ExternalName) == ACPI_NAMESEG_SIZE) 746 { 747 AslError (ASL_ERROR, ASL_MSG_NOT_FOUND, Op, 748 Op->Asl.ExternalName); 749 } 750 else 751 { 752 AslError (ASL_ERROR, ASL_MSG_NAMEPATH_NOT_EXIST, Op, 753 Op->Asl.ExternalName); 754 } 755 } 756 } 757 758 Status = AE_OK; 759 } 760 761 return_ACPI_STATUS (Status); 762 } 763 764 /* Check for an attempt to access an object in another method */ 765 766 if (!XfValidateCrossReference (Op, OpInfo, Node)) 767 { 768 AslError (ASL_ERROR, ASL_MSG_TEMPORARY_OBJECT, Op, 769 Op->Asl.ExternalName); 770 return_ACPI_STATUS (Status); 771 } 772 773 /* Object was found above, check for an illegal forward reference */ 774 775 if (Op->Asl.CompileFlags & OP_NOT_FOUND_DURING_LOAD) 776 { 777 /* 778 * During the load phase, this Op was flagged as a possible 779 * illegal forward reference. In other words, Op is a name path or 780 * name segment that refers to a named object declared after the 781 * reference. In this scinario, Node refers to the actual declaration 782 * and Op is a parse node that references the named object. 783 * 784 * Note: 785 * 786 * Object references inside of control methods are allowed to 787 * refer to objects declared outside of control methods. 788 * 789 * If the declaration and reference are both contained inside of the 790 * same method or outside of any method, this is a forward reference 791 * and should be reported as a compiler error. 792 */ 793 DeclarationParentMethod = UtGetParentMethodNode (Node); 794 ReferenceParentMethod = UtGetParentMethodOp (Op); 795 796 /* case 1: declaration and reference are both outside of method */ 797 798 if (!ReferenceParentMethod && !DeclarationParentMethod) 799 { 800 AslError (ASL_ERROR, ASL_MSG_ILLEGAL_FORWARD_REF, Op, 801 Op->Asl.ExternalName); 802 } 803 804 /* case 2: declaration and reference are both inside of the same method */ 805 806 else if (ReferenceParentMethod && DeclarationParentMethod && 807 ReferenceParentMethod == DeclarationParentMethod->Op) 808 { 809 AslError (ASL_ERROR, ASL_MSG_ILLEGAL_FORWARD_REF, Op, 810 Op->Asl.ExternalName); 811 } 812 } 813 814 /* Check for a reference vs. name declaration */ 815 816 if (!(OpInfo->Flags & AML_NAMED) && 817 !(OpInfo->Flags & AML_CREATE)) 818 { 819 /* This node has been referenced, mark it for reference check */ 820 821 Node->Flags |= ANOBJ_IS_REFERENCED; 822 } 823 824 /* 825 * Attempt to optimize the NamePath 826 * 827 * One special case: CondRefOf operator - not all AML interpreter 828 * implementations expect optimized namepaths as a parameter to this 829 * operator. They require relative name paths with prefix operators or 830 * namepaths starting with the root scope. 831 * 832 * Other AML interpreter implementations do not perform the namespace 833 * search that starts at the current scope and recursively searching the 834 * parent scope until the root scope. The lack of search is only known to 835 * occur for the namestring parameter for the CondRefOf operator. 836 */ 837 if ((Op->Asl.Parent) && 838 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_CONDREFOF)) 839 { 840 OptOptimizeNamePath (Op, OpInfo->Flags, WalkState, Path, Node); 841 } 842 843 /* 844 * 1) Dereference an alias (A name reference that is an alias) 845 * Aliases are not nested, the alias always points to the final object 846 */ 847 if ((Op->Asl.ParseOpcode != PARSEOP_ALIAS) && 848 (Node->Type == ACPI_TYPE_LOCAL_ALIAS)) 849 { 850 /* This node points back to the original PARSEOP_ALIAS */ 851 852 NextOp = Node->Op; 853 854 /* The first child is the alias target op */ 855 856 NextOp = NextOp->Asl.Child; 857 858 /* That in turn points back to original target alias node */ 859 860 if (NextOp->Asl.Node) 861 { 862 Node = NextOp->Asl.Node; 863 } 864 865 /* Else - forward reference to alias, will be resolved later */ 866 } 867 868 /* 2) Check for a reference to a resource descriptor */ 869 870 if ((Node->Type == ACPI_TYPE_LOCAL_RESOURCE_FIELD) || 871 (Node->Type == ACPI_TYPE_LOCAL_RESOURCE)) 872 { 873 /* 874 * This was a reference to a field within a resource descriptor. 875 * Extract the associated field offset (either a bit or byte 876 * offset depending on the field type) and change the named 877 * reference into an integer for AML code generation 878 */ 879 Offset = Node->Value; 880 TagBitLength = Node->Length; 881 882 /* 883 * If a field is being created, generate the length (in bits) of 884 * the field. Note: Opcodes other than CreateXxxField and Index 885 * can come through here. For other opcodes, we just need to 886 * convert the resource tag reference to an integer offset. 887 */ 888 switch (Op->Asl.Parent->Asl.AmlOpcode) 889 { 890 case AML_CREATE_FIELD_OP: /* Variable "Length" field, in bits */ 891 /* 892 * We know the length operand is an integer constant because 893 * we know that it contains a reference to a resource 894 * descriptor tag. 895 */ 896 FieldBitLength = (UINT32) Op->Asl.Next->Asl.Value.Integer; 897 break; 898 899 case AML_CREATE_BIT_FIELD_OP: 900 901 FieldBitLength = 1; 902 break; 903 904 case AML_CREATE_BYTE_FIELD_OP: 905 case AML_INDEX_OP: 906 907 FieldBitLength = 8; 908 break; 909 910 case AML_CREATE_WORD_FIELD_OP: 911 912 FieldBitLength = 16; 913 break; 914 915 case AML_CREATE_DWORD_FIELD_OP: 916 917 FieldBitLength = 32; 918 break; 919 920 case AML_CREATE_QWORD_FIELD_OP: 921 922 FieldBitLength = 64; 923 break; 924 925 default: 926 927 FieldBitLength = 0; 928 break; 929 } 930 931 /* Check the field length against the length of the resource tag */ 932 933 if (FieldBitLength) 934 { 935 if (TagBitLength < FieldBitLength) 936 { 937 Message = ASL_MSG_TAG_SMALLER; 938 } 939 else if (TagBitLength > FieldBitLength) 940 { 941 Message = ASL_MSG_TAG_LARGER; 942 } 943 944 if (Message) 945 { 946 sprintf (AslGbl_MsgBuffer, 947 "Size mismatch, Tag: %u bit%s, Field: %u bit%s", 948 TagBitLength, (TagBitLength > 1) ? "s" : "", 949 FieldBitLength, (FieldBitLength > 1) ? "s" : ""); 950 951 AslError (ASL_WARNING, Message, Op, AslGbl_MsgBuffer); 952 } 953 } 954 955 /* Convert the BitOffset to a ByteOffset for certain opcodes */ 956 957 switch (Op->Asl.Parent->Asl.AmlOpcode) 958 { 959 case AML_CREATE_BYTE_FIELD_OP: 960 case AML_CREATE_WORD_FIELD_OP: 961 case AML_CREATE_DWORD_FIELD_OP: 962 case AML_CREATE_QWORD_FIELD_OP: 963 case AML_INDEX_OP: 964 965 Offset = ACPI_DIV_8 (Offset); 966 break; 967 968 default: 969 970 break; 971 } 972 973 /* Now convert this node to an integer whose value is the field offset */ 974 975 Op->Asl.AmlLength = 0; 976 Op->Asl.ParseOpcode = PARSEOP_INTEGER; 977 Op->Asl.Value.Integer = (UINT64) Offset; 978 Op->Asl.CompileFlags |= OP_IS_RESOURCE_FIELD; 979 980 OpcGenerateAmlOpcode (Op); 981 } 982 983 /* 3) Check for a method invocation */ 984 985 else if ((((Op->Asl.ParseOpcode == PARSEOP_NAMESTRING) || (Op->Asl.ParseOpcode == PARSEOP_NAMESEG)) && 986 (Node->Type == ACPI_TYPE_METHOD) && 987 (Op->Asl.Parent) && 988 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_METHOD)) || 989 990 (Op->Asl.ParseOpcode == PARSEOP_METHODCALL)) 991 { 992 /* 993 * A reference to a method within one of these opcodes is not an 994 * invocation of the method, it is simply a reference to the method. 995 * 996 * September 2016: Removed DeRefOf from this list 997 */ 998 if ((Op->Asl.Parent) && 999 ((Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_REFOF) || 1000 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_PACKAGE) || 1001 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_VAR_PACKAGE)|| 1002 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_OBJECTTYPE))) 1003 { 1004 return_ACPI_STATUS (AE_OK); 1005 } 1006 1007 /* 1008 * There are two types of method invocation: 1009 * 1) Invocation with arguments -- the parser recognizes this 1010 * as a METHODCALL. 1011 * 2) Invocation with no arguments --the parser cannot determine that 1012 * this is a method invocation, therefore we have to figure it out 1013 * here. 1014 */ 1015 if (Node->Type != ACPI_TYPE_METHOD) 1016 { 1017 sprintf (AslGbl_MsgBuffer, "%s is a %s", 1018 Op->Asl.ExternalName, AcpiUtGetTypeName (Node->Type)); 1019 1020 AslError (ASL_ERROR, ASL_MSG_NOT_METHOD, Op, AslGbl_MsgBuffer); 1021 return_ACPI_STATUS (AE_OK); 1022 } 1023 1024 /* Save the method node in the caller's op */ 1025 1026 Op->Asl.Node = Node; 1027 if (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_CONDREFOF) 1028 { 1029 return_ACPI_STATUS (AE_OK); 1030 } 1031 1032 /* 1033 * This is a method invocation, with or without arguments. 1034 * Count the number of arguments, each appears as a child 1035 * under the parent node 1036 */ 1037 Op->Asl.ParseOpcode = PARSEOP_METHODCALL; 1038 UtSetParseOpName (Op); 1039 1040 PassedArgs = 0; 1041 NextOp = Op->Asl.Child; 1042 1043 while (NextOp) 1044 { 1045 PassedArgs++; 1046 NextOp = NextOp->Asl.Next; 1047 } 1048 1049 if (Node->Value != ASL_EXTERNAL_METHOD_UNKNOWN_PARAMS && 1050 Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_EXTERNAL) 1051 { 1052 /* 1053 * Check the parsed arguments with the number expected by the 1054 * method declaration itself 1055 */ 1056 if (PassedArgs != Node->Value) 1057 { 1058 if (Node->Flags & ANOBJ_IS_EXTERNAL) 1059 { 1060 sprintf (AslGbl_MsgBuffer, 1061 "according to previous use, %s requires %u", 1062 Op->Asl.ExternalName, Node->Value); 1063 } 1064 else 1065 { 1066 sprintf (AslGbl_MsgBuffer, "%s requires %u", Op->Asl.ExternalName, 1067 Node->Value); 1068 } 1069 1070 if (PassedArgs < Node->Value) 1071 { 1072 AslError (ASL_ERROR, ASL_MSG_ARG_COUNT_LO, Op, AslGbl_MsgBuffer); 1073 } 1074 else 1075 { 1076 AslError (ASL_ERROR, ASL_MSG_ARG_COUNT_HI, Op, AslGbl_MsgBuffer); 1077 } 1078 } 1079 } 1080 1081 /* 1082 * At this point, a method call to an external method has been 1083 * detected. As of 11/19/2019, iASL does not support parameter counts 1084 * for methods declared as external. Therefore, save the parameter 1085 * count of the first method call and use this count check other 1086 * method calls to ensure that the methods are being called with the 1087 * same amount of parameters. 1088 */ 1089 else if (Node->Type == ACPI_TYPE_METHOD && 1090 (Node->Flags & ANOBJ_IS_EXTERNAL) && 1091 Node->Value == ASL_EXTERNAL_METHOD_UNKNOWN_PARAMS && 1092 Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_EXTERNAL) 1093 { 1094 Node->Value = PassedArgs; 1095 } 1096 } 1097 1098 /* 4) Check for an ASL Field definition */ 1099 1100 else if ((Op->Asl.Parent) && 1101 ((Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_FIELD) || 1102 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_BANKFIELD))) 1103 { 1104 /* 1105 * Offset checking for fields. If the parent operation region has a 1106 * constant length (known at compile time), we can check fields 1107 * defined in that region against the region length. This will catch 1108 * fields and field units that cannot possibly fit within the region. 1109 * 1110 * Note: Index fields do not directly reference an operation region, 1111 * thus they are not included in this check. 1112 */ 1113 if (Op == Op->Asl.Parent->Asl.Child) 1114 { 1115 /* 1116 * This is the first child of the field node, which is 1117 * the name of the region. Get the parse node for the 1118 * region -- which contains the length of the region. 1119 */ 1120 OwningOp = Node->Op; 1121 Op->Asl.Parent->Asl.ExtraValue = 1122 ACPI_MUL_8 ((UINT32) OwningOp->Asl.Value.Integer); 1123 1124 /* Examine the field access width */ 1125 1126 switch ((UINT8) Op->Asl.Parent->Asl.Value.Integer) 1127 { 1128 case AML_FIELD_ACCESS_ANY: 1129 case AML_FIELD_ACCESS_BYTE: 1130 case AML_FIELD_ACCESS_BUFFER: 1131 default: 1132 1133 MinimumLength = 1; 1134 break; 1135 1136 case AML_FIELD_ACCESS_WORD: 1137 1138 MinimumLength = 2; 1139 break; 1140 1141 case AML_FIELD_ACCESS_DWORD: 1142 1143 MinimumLength = 4; 1144 break; 1145 1146 case AML_FIELD_ACCESS_QWORD: 1147 1148 MinimumLength = 8; 1149 break; 1150 } 1151 1152 /* 1153 * Is the region at least as big as the access width? 1154 * Note: DataTableRegions have 0 length 1155 */ 1156 if (((UINT32) OwningOp->Asl.Value.Integer) && 1157 ((UINT32) OwningOp->Asl.Value.Integer < MinimumLength)) 1158 { 1159 AslError (ASL_ERROR, ASL_MSG_FIELD_ACCESS_WIDTH, Op, NULL); 1160 } 1161 1162 /* 1163 * Check EC/CMOS/SMBUS fields to make sure that the correct 1164 * access type is used (BYTE for EC/CMOS, BUFFER for SMBUS) 1165 */ 1166 SpaceIdOp = OwningOp->Asl.Child->Asl.Next; 1167 switch ((UINT32) SpaceIdOp->Asl.Value.Integer) 1168 { 1169 case ACPI_ADR_SPACE_EC: 1170 case ACPI_ADR_SPACE_CMOS: 1171 case ACPI_ADR_SPACE_GPIO: 1172 1173 if ((UINT8) Op->Asl.Parent->Asl.Value.Integer != 1174 AML_FIELD_ACCESS_BYTE) 1175 { 1176 AslError (ASL_ERROR, ASL_MSG_REGION_BYTE_ACCESS, Op, NULL); 1177 } 1178 break; 1179 1180 case ACPI_ADR_SPACE_SMBUS: 1181 case ACPI_ADR_SPACE_IPMI: 1182 case ACPI_ADR_SPACE_GSBUS: 1183 1184 if ((UINT8) Op->Asl.Parent->Asl.Value.Integer != 1185 AML_FIELD_ACCESS_BUFFER) 1186 { 1187 AslError (ASL_ERROR, ASL_MSG_REGION_BUFFER_ACCESS, Op, NULL); 1188 } 1189 break; 1190 1191 default: 1192 1193 /* Nothing to do for other address spaces */ 1194 1195 break; 1196 } 1197 } 1198 else 1199 { 1200 /* 1201 * This is one element of the field list. Check to make sure 1202 * that it does not go beyond the end of the parent operation region. 1203 * 1204 * In the code below: 1205 * Op->Asl.Parent->Asl.ExtraValue - Region Length (bits) 1206 * Op->Asl.ExtraValue - Field start offset (bits) 1207 * Op->Asl.Child->Asl.Value.Integer32 - Field length (bits) 1208 * Op->Asl.Child->Asl.ExtraValue - Field access width (bits) 1209 */ 1210 if (Op->Asl.Parent->Asl.ExtraValue && Op->Asl.Child) 1211 { 1212 XfCheckFieldRange (Op, 1213 Op->Asl.Parent->Asl.ExtraValue, 1214 Op->Asl.ExtraValue, 1215 (UINT32) Op->Asl.Child->Asl.Value.Integer, 1216 Op->Asl.Child->Asl.ExtraValue); 1217 } 1218 } 1219 } 1220 1221 /* 1222 * 5) Check for external resolution 1223 * 1224 * By this point, everything should be loaded in the namespace. If a 1225 * namespace lookup results in a namespace node that is an external, it 1226 * means that this named object was not defined in the input ASL. This 1227 * causes issues because there are plenty of incidents where developers 1228 * use the external keyword to suppress compiler errors about undefined 1229 * objects. Note: this only applies when compiling multiple definition 1230 * blocks. 1231 * 1232 * Do not check for external resolution in the following cases: 1233 * 1234 * case 1) External (ABCD) 1235 * 1236 * This declares ABCD as an external so there is no requirement for 1237 * ABCD to be loaded in the namespace when analyzing the actual 1238 * External() statement. 1239 * 1240 * case 2) CondRefOf (ABCD) 1241 * 1242 * This operator will query the ACPI namespace on the existence of 1243 * ABCD. If ABCD does not exist, this operator will return a 0 1244 * without incurring AML runtime errors. Therefore, ABCD is allowed 1245 * to not exist when analyzing the CondRefOf operator. 1246 * 1247 * case 3) External (ABCD) 1248 * if (CondRefOf (ABCD)) 1249 * { 1250 * Store (0, ABCD) 1251 * } 1252 * 1253 * In this case, ABCD is accessed only if it exists due to the if 1254 * statement so there is no need to flag the ABCD nested in the 1255 * store operator. 1256 */ 1257 if (AslGbl_ParseTreeRoot->Asl.Child && AslGbl_ParseTreeRoot->Asl.Child->Asl.Next && 1258 (Node->Flags & ANOBJ_IS_EXTERNAL) && 1259 Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_EXTERNAL && 1260 Op->Asl.ParseOpcode != PARSEOP_EXTERNAL && 1261 Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_CONDREFOF && 1262 !XfRefIsGuardedByIfCondRefOf (Node, Op)) 1263 { 1264 AslError (ASL_ERROR, ASL_MSG_UNDEFINED_EXTERNAL, Op, NULL); 1265 } 1266 1267 /* 5) Check for a connection object */ 1268 #if 0 1269 else if (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_CONNECTION) 1270 { 1271 return_ACPI_STATUS (Status); 1272 } 1273 #endif 1274 1275 Op->Asl.Node = Node; 1276 return_ACPI_STATUS (Status); 1277 } 1278 1279 1280 /******************************************************************************* 1281 * 1282 * FUNCTION: XfRefIsGuardedByIfCondRefOf 1283 * 1284 * PARAMETERS: Node - Named object reference node 1285 * Op - Named object reference parse node 1286 * 1287 * RETURN: BOOLEAN 1288 * 1289 * DESCRIPTION: returns true if Op checked inside if (CondRefOf (...)) 1290 * refers to Node. 1291 * 1292 ******************************************************************************/ 1293 1294 static BOOLEAN 1295 XfRefIsGuardedByIfCondRefOf ( 1296 ACPI_NAMESPACE_NODE *Node, 1297 ACPI_PARSE_OBJECT *Op) 1298 { 1299 ACPI_PARSE_OBJECT *Parent = Op->Asl.Parent; 1300 1301 1302 while (Parent) 1303 { 1304 if (Parent->Asl.ParseOpcode == PARSEOP_IF && 1305 XfFindCondRefOfName (Node, Parent->Asl.Child)) 1306 { 1307 return (TRUE); 1308 } 1309 1310 Parent = Parent->Asl.Parent; 1311 } 1312 1313 return (FALSE); 1314 } 1315 1316 1317 /******************************************************************************* 1318 * 1319 * FUNCTION: XfRefIsGuardedByIfCondRefOf 1320 * 1321 * PARAMETERS: Node - Named object reference node 1322 * Op - Named object reference parse node 1323 * 1324 * RETURN: BOOLEAN 1325 * 1326 * DESCRIPTION: returns true if Op checked inside if (CondRefOf (...)) 1327 * refers to Node. 1328 * 1329 ******************************************************************************/ 1330 1331 static BOOLEAN 1332 XfFindCondRefOfName ( 1333 ACPI_NAMESPACE_NODE *Node, 1334 ACPI_PARSE_OBJECT *Op) 1335 { 1336 BOOLEAN CondRefOfFound = FALSE; 1337 1338 1339 if (!Op) 1340 { 1341 return (FALSE); 1342 } 1343 1344 switch (Op->Asl.ParseOpcode) 1345 { 1346 case PARSEOP_CONDREFOF: 1347 1348 return (Op->Asl.Child->Common.Node == Node); 1349 break; 1350 1351 case PARSEOP_LAND: 1352 1353 CondRefOfFound = XfFindCondRefOfName (Node, Op->Asl.Child); 1354 if (CondRefOfFound) 1355 { 1356 return (TRUE); 1357 } 1358 1359 return (XfFindCondRefOfName (Node, Op->Asl.Child->Asl.Next)); 1360 break; 1361 1362 default: 1363 1364 return (FALSE); 1365 break; 1366 } 1367 } 1368 1369 1370 /******************************************************************************* 1371 * 1372 * FUNCTION: XfNamespaceLocateEnd 1373 * 1374 * PARAMETERS: ASL_WALK_CALLBACK 1375 * 1376 * RETURN: Status 1377 * 1378 * DESCRIPTION: Ascending callback used during cross reference. We only 1379 * need to worry about scope management here. 1380 * 1381 ******************************************************************************/ 1382 1383 static ACPI_STATUS 1384 XfNamespaceLocateEnd ( 1385 ACPI_PARSE_OBJECT *Op, 1386 UINT32 Level, 1387 void *Context) 1388 { 1389 ACPI_WALK_STATE *WalkState = (ACPI_WALK_STATE *) Context; 1390 const ACPI_OPCODE_INFO *OpInfo; 1391 1392 1393 ACPI_FUNCTION_TRACE (XfNamespaceLocateEnd); 1394 1395 1396 /* We are only interested in opcodes that have an associated name */ 1397 1398 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode); 1399 if (!(OpInfo->Flags & AML_NAMED)) 1400 { 1401 return_ACPI_STATUS (AE_OK); 1402 } 1403 1404 /* Not interested in name references, we did not open a scope for them */ 1405 1406 if ((Op->Asl.ParseOpcode == PARSEOP_NAMESTRING) || 1407 (Op->Asl.ParseOpcode == PARSEOP_NAMESEG) || 1408 (Op->Asl.ParseOpcode == PARSEOP_METHODCALL) || 1409 (Op->Asl.ParseOpcode == PARSEOP_EXTERNAL)) 1410 { 1411 return_ACPI_STATUS (AE_OK); 1412 } 1413 1414 /* Pop the scope stack if necessary */ 1415 1416 if (AcpiNsOpensScope (AslMapNamedOpcodeToDataType (Op->Asl.AmlOpcode))) 1417 { 1418 1419 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, 1420 "%s: Popping scope for Op %p\n", 1421 AcpiUtGetTypeName (OpInfo->ObjectType), Op)); 1422 1423 (void) AcpiDsScopeStackPop (WalkState); 1424 } 1425 1426 return_ACPI_STATUS (AE_OK); 1427 } 1428 1429 1430 /******************************************************************************* 1431 * 1432 * FUNCTION: XfValidateCrossReference 1433 * 1434 * PARAMETERS: Op - Parse Op that references the object 1435 * OpInfo - Parse Op info struct 1436 * Node - Node for the referenced object 1437 * 1438 * RETURN: TRUE if the reference is legal, FALSE otherwise 1439 * 1440 * DESCRIPTION: Determine if a reference to another object is allowed. 1441 * 1442 * EXAMPLE: 1443 * Method (A) {Name (INT1, 1)} Declaration of object INT1 1444 * Method (B) (Store (2, \A.INT1)} Illegal reference to object INT1 1445 * (INT1 is temporary, valid only during 1446 * execution of A) 1447 * 1448 * NOTES: 1449 * A null pointer returned by either UtGetParentMethodOp or 1450 * UtGetParentMethodNode indicates that the parameter object is not 1451 * within a control method. 1452 * 1453 * Five cases are handled: Case(Op, Node) 1454 * 1) Case(0,0): Op is not within a method, Node is not --> OK 1455 * 2) Case(0,1): Op is not within a method, but Node is --> Illegal 1456 * 3) Case(1,0): Op is within a method, Node is not --> OK 1457 * 4) Case(1,1): Both are within the same method --> OK 1458 * 5) Case(1,1): Both are in methods, but not same method --> Illegal 1459 * 1460 ******************************************************************************/ 1461 1462 static BOOLEAN 1463 XfValidateCrossReference ( 1464 ACPI_PARSE_OBJECT *Op, 1465 const ACPI_OPCODE_INFO *OpInfo, 1466 ACPI_NAMESPACE_NODE *Node) 1467 { 1468 ACPI_PARSE_OBJECT *ReferencingMethodOp; 1469 ACPI_NAMESPACE_NODE *ReferencedMethodNode; 1470 1471 1472 /* Ignore actual named (and related) object declarations */ 1473 1474 if (OpInfo->Flags & (AML_NAMED | AML_CREATE | AML_DEFER | AML_HAS_ARGS)) 1475 { 1476 return (TRUE); 1477 } 1478 1479 /* 1480 * 1) Search upwards in parse tree for owner of the referencing object 1481 * 2) Search upwards in namespace to find the owner of the referenced object 1482 */ 1483 ReferencingMethodOp = UtGetParentMethodOp (Op); 1484 ReferencedMethodNode = UtGetParentMethodNode (Node); 1485 1486 if (!ReferencingMethodOp && !ReferencedMethodNode) 1487 { 1488 /* 1489 * 1) Case (0,0): Both Op and Node are not within methods 1490 * --> OK 1491 */ 1492 return (TRUE); 1493 } 1494 1495 if (!ReferencingMethodOp && ReferencedMethodNode) 1496 { 1497 /* 1498 * 2) Case (0,1): Op is not in a method, but Node is within a 1499 * method --> illegal 1500 */ 1501 return (FALSE); 1502 } 1503 else if (ReferencingMethodOp && !ReferencedMethodNode) 1504 { 1505 /* 1506 * 3) Case (1,0): Op is within a method, but Node is not 1507 * --> OK 1508 */ 1509 return (TRUE); 1510 } 1511 else if (ReferencingMethodOp->Asl.Node == ReferencedMethodNode) 1512 { 1513 /* 1514 * 4) Case (1,1): Both Op and Node are within the same method 1515 * --> OK 1516 */ 1517 return (TRUE); 1518 } 1519 else 1520 { 1521 /* 1522 * 5) Case (1,1), Op and Node are in different methods 1523 * --> Illegal 1524 */ 1525 return (FALSE); 1526 } 1527 } 1528