1 /****************************************************************************** 2 * 3 * Module Name: aslwalks.c - Miscellaneous analytical parse tree walks 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 "aslcompiler.h" 153 #include "aslcompiler.y.h" 154 #include "acparser.h" 155 #include "amlcode.h" 156 157 158 #define _COMPONENT ACPI_COMPILER 159 ACPI_MODULE_NAME ("aslwalks") 160 161 162 /* Local prototypes */ 163 164 static void 165 AnAnalyzeStoreOperator ( 166 ACPI_PARSE_OBJECT *Op); 167 168 static BOOLEAN 169 AnIsValidBufferConstant ( 170 ACPI_PARSE_OBJECT *Op); 171 172 static void 173 AnValidateCreateBufferField ( 174 ACPI_PARSE_OBJECT *CreateBufferFieldOp); 175 176 177 /******************************************************************************* 178 * 179 * FUNCTION: AnMethodTypingWalkEnd 180 * 181 * PARAMETERS: ASL_WALK_CALLBACK 182 * 183 * RETURN: Status 184 * 185 * DESCRIPTION: Ascending callback for typing walk. Complete the method 186 * return analysis. Check methods for: 187 * 1) Initialized local variables 188 * 2) Valid arguments 189 * 3) Return types 190 * 191 ******************************************************************************/ 192 193 ACPI_STATUS 194 AnMethodTypingWalkEnd ( 195 ACPI_PARSE_OBJECT *Op, 196 UINT32 Level, 197 void *Context) 198 { 199 UINT32 ThisOpBtype; 200 201 202 switch (Op->Asl.ParseOpcode) 203 { 204 case PARSEOP_METHOD: 205 206 Op->Asl.CompileFlags |= OP_METHOD_TYPED; 207 break; 208 209 case PARSEOP_RETURN: 210 211 if ((Op->Asl.Child) && 212 (Op->Asl.Child->Asl.ParseOpcode != PARSEOP_DEFAULT_ARG)) 213 { 214 ThisOpBtype = AnGetBtype (Op->Asl.Child); 215 216 if ((Op->Asl.Child->Asl.ParseOpcode == PARSEOP_METHODCALL) && 217 (ThisOpBtype == (ACPI_UINT32_MAX -1))) 218 { 219 /* 220 * The called method is untyped at this time (typically a 221 * forward reference). 222 * 223 * Check for a recursive method call first. Note: the 224 * Child->Node will be null if the method has not been 225 * resolved. 226 */ 227 if (Op->Asl.Child->Asl.Node && 228 (Op->Asl.ParentMethod != Op->Asl.Child->Asl.Node->Op)) 229 { 230 /* We must type the method here */ 231 232 TrWalkParseTree (Op->Asl.Child->Asl.Node->Op, 233 ASL_WALK_VISIT_UPWARD, NULL, 234 AnMethodTypingWalkEnd, NULL); 235 236 ThisOpBtype = AnGetBtype (Op->Asl.Child); 237 } 238 } 239 240 /* Returns a value, save the value type */ 241 242 if (Op->Asl.ParentMethod) 243 { 244 Op->Asl.ParentMethod->Asl.AcpiBtype |= ThisOpBtype; 245 } 246 } 247 break; 248 249 default: 250 251 break; 252 } 253 254 return (AE_OK); 255 } 256 257 258 /******************************************************************************* 259 * 260 * FUNCTION: AnOperandTypecheckWalkEnd 261 * 262 * PARAMETERS: ASL_WALK_CALLBACK 263 * 264 * RETURN: Status 265 * 266 * DESCRIPTION: Ascending callback for analysis walk. Complete method 267 * return analysis. 268 * 269 ******************************************************************************/ 270 271 ACPI_STATUS 272 AnOperandTypecheckWalkEnd ( 273 ACPI_PARSE_OBJECT *Op, 274 UINT32 Level, 275 void *Context) 276 { 277 const ACPI_OPCODE_INFO *OpInfo; 278 UINT32 RuntimeArgTypes; 279 UINT32 RuntimeArgTypes2; 280 UINT32 RequiredBtypes; 281 UINT32 ThisNodeBtype; 282 UINT32 CommonBtypes; 283 UINT32 OpcodeClass; 284 ACPI_PARSE_OBJECT *ArgOp; 285 UINT32 ArgType; 286 287 288 switch (Op->Asl.AmlOpcode) 289 { 290 case AML_RAW_DATA_BYTE: 291 case AML_RAW_DATA_WORD: 292 case AML_RAW_DATA_DWORD: 293 case AML_RAW_DATA_QWORD: 294 case AML_RAW_DATA_BUFFER: 295 case AML_RAW_DATA_CHAIN: 296 case AML_PACKAGE_LENGTH: 297 case AML_UNASSIGNED_OPCODE: 298 case AML_DEFAULT_ARG_OP: 299 300 /* Ignore the internal (compiler-only) AML opcodes */ 301 302 return (AE_OK); 303 304 default: 305 306 break; 307 } 308 309 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode); 310 if (!OpInfo) 311 { 312 return (AE_OK); 313 } 314 315 ArgOp = Op->Asl.Child; 316 OpcodeClass = OpInfo->Class; 317 RuntimeArgTypes = OpInfo->RuntimeArgs; 318 319 #ifdef ASL_ERROR_NAMED_OBJECT_IN_WHILE 320 /* 321 * Update 11/2008: In practice, we can't perform this check. A simple 322 * analysis is not sufficient. Also, it can cause errors when compiling 323 * disassembled code because of the way Switch operators are implemented 324 * (a While(One) loop with a named temp variable created within.) 325 */ 326 327 /* 328 * If we are creating a named object, check if we are within a while loop 329 * by checking if the parent is a WHILE op. This is a simple analysis, but 330 * probably sufficient for many cases. 331 * 332 * Allow Scope(), Buffer(), and Package(). 333 */ 334 if (((OpcodeClass == AML_CLASS_NAMED_OBJECT) && (Op->Asl.AmlOpcode != AML_SCOPE_OP)) || 335 ((OpcodeClass == AML_CLASS_CREATE) && (OpInfo->Flags & AML_NSNODE))) 336 { 337 if (Op->Asl.Parent->Asl.AmlOpcode == AML_WHILE_OP) 338 { 339 AslError (ASL_ERROR, ASL_MSG_NAMED_OBJECT_IN_WHILE, Op, NULL); 340 } 341 } 342 #endif 343 344 /* 345 * Special case for control opcodes IF/RETURN/WHILE since they 346 * have no runtime arg list (at this time) 347 */ 348 switch (Op->Asl.AmlOpcode) 349 { 350 case AML_IF_OP: 351 case AML_WHILE_OP: 352 case AML_RETURN_OP: 353 354 if (ArgOp->Asl.ParseOpcode == PARSEOP_METHODCALL) 355 { 356 /* Check for an internal method */ 357 358 if (AnIsInternalMethod (ArgOp)) 359 { 360 return (AE_OK); 361 } 362 363 /* The lone arg is a method call, check it */ 364 365 RequiredBtypes = AnMapArgTypeToBtype (ARGI_INTEGER); 366 if (Op->Asl.AmlOpcode == AML_RETURN_OP) 367 { 368 RequiredBtypes = 0xFFFFFFFF; 369 } 370 371 ThisNodeBtype = AnGetBtype (ArgOp); 372 if (ThisNodeBtype == ACPI_UINT32_MAX) 373 { 374 return (AE_OK); 375 } 376 377 AnCheckMethodReturnValue (Op, OpInfo, ArgOp, 378 RequiredBtypes, ThisNodeBtype); 379 } 380 return (AE_OK); 381 382 case AML_EXTERNAL_OP: 383 /* 384 * Not really a "runtime" opcode since it used by disassembler only. 385 * The parser will find any issues with the operands. 386 */ 387 return (AE_OK); 388 389 default: 390 391 break; 392 } 393 394 /* Ignore the non-executable opcodes */ 395 396 if (RuntimeArgTypes == ARGI_INVALID_OPCODE) 397 { 398 return (AE_OK); 399 } 400 401 /* 402 * Special handling for certain opcodes. 403 */ 404 switch (Op->Asl.AmlOpcode) 405 { 406 /* BankField has one TermArg */ 407 408 case AML_BANK_FIELD_OP: 409 410 OpcodeClass = AML_CLASS_EXECUTE; 411 ArgOp = ArgOp->Asl.Next; 412 ArgOp = ArgOp->Asl.Next; 413 break; 414 415 /* Operation Region has 2 TermArgs */ 416 417 case AML_REGION_OP: 418 419 OpcodeClass = AML_CLASS_EXECUTE; 420 ArgOp = ArgOp->Asl.Next; 421 ArgOp = ArgOp->Asl.Next; 422 break; 423 424 /* DataTableRegion has 3 TermArgs */ 425 426 case AML_DATA_REGION_OP: 427 428 OpcodeClass = AML_CLASS_EXECUTE; 429 ArgOp = ArgOp->Asl.Next; 430 break; 431 432 /* Buffers/Packages have a length that is a TermArg */ 433 434 case AML_BUFFER_OP: 435 case AML_PACKAGE_OP: 436 case AML_VARIABLE_PACKAGE_OP: 437 438 /* If length is a constant, we are done */ 439 440 if ((ArgOp->Asl.ParseOpcode == PARSEOP_INTEGER) || 441 (ArgOp->Asl.ParseOpcode == PARSEOP_RAW_DATA)) 442 { 443 return (AE_OK); 444 } 445 break; 446 447 /* Store can write any object to the Debug object */ 448 449 case AML_STORE_OP: 450 /* 451 * If this is a Store() to the Debug object, we don't need 452 * to perform any further validation -- because a Store of 453 * any object to Debug is permitted and supported. 454 */ 455 if (ArgOp->Asl.Next->Asl.AmlOpcode == AML_DEBUG_OP) 456 { 457 return (AE_OK); 458 } 459 break; 460 461 default: 462 break; 463 } 464 465 switch (OpcodeClass) 466 { 467 case AML_CLASS_EXECUTE: 468 case AML_CLASS_CREATE: 469 case AML_CLASS_CONTROL: 470 case AML_CLASS_RETURN_VALUE: 471 472 /* Reverse the runtime argument list */ 473 474 RuntimeArgTypes2 = 0; 475 while ((ArgType = GET_CURRENT_ARG_TYPE (RuntimeArgTypes))) 476 { 477 RuntimeArgTypes2 <<= ARG_TYPE_WIDTH; 478 RuntimeArgTypes2 |= ArgType; 479 INCREMENT_ARG_LIST (RuntimeArgTypes); 480 } 481 482 /* Typecheck each argument */ 483 484 while ((ArgType = GET_CURRENT_ARG_TYPE (RuntimeArgTypes2))) 485 { 486 /* Get the required type(s) for the argument */ 487 488 RequiredBtypes = AnMapArgTypeToBtype (ArgType); 489 490 if (!ArgOp) 491 { 492 AslError (ASL_ERROR, ASL_MSG_COMPILER_INTERNAL, Op, 493 "Null ArgOp in argument loop"); 494 AslAbort (); 495 } 496 497 /* Get the actual type of the argument */ 498 499 ThisNodeBtype = AnGetBtype (ArgOp); 500 if (ThisNodeBtype == ACPI_UINT32_MAX) 501 { 502 goto NextArgument; 503 } 504 505 /* Examine the arg based on the required type of the arg */ 506 507 switch (ArgType) 508 { 509 case ARGI_TARGETREF: 510 511 if (ArgOp->Asl.ParseOpcode == PARSEOP_ZERO) 512 { 513 /* ZERO is the placeholder for "don't store result" */ 514 515 ThisNodeBtype = RequiredBtypes; 516 break; 517 } 518 519 ACPI_FALLTHROUGH; 520 521 case ARGI_STORE_TARGET: 522 523 if (ArgOp->Asl.ParseOpcode == PARSEOP_INTEGER) 524 { 525 /* 526 * This is the case where an original reference to a resource 527 * descriptor field has been replaced by an (Integer) offset. 528 * These named fields are supported at compile-time only; 529 * the names are not passed to the interpreter (via the AML). 530 */ 531 if ((ArgOp->Asl.Node->Type == ACPI_TYPE_LOCAL_RESOURCE_FIELD) || 532 (ArgOp->Asl.Node->Type == ACPI_TYPE_LOCAL_RESOURCE)) 533 { 534 AslError (ASL_ERROR, ASL_MSG_RESOURCE_FIELD, 535 ArgOp, NULL); 536 } 537 else 538 { 539 AslError (ASL_ERROR, ASL_MSG_INVALID_TYPE, 540 ArgOp, NULL); 541 } 542 } 543 break; 544 545 546 #ifdef __FUTURE_IMPLEMENTATION 547 /* 548 * Possible future typechecking support 549 */ 550 case ARGI_REFERENCE: /* References */ 551 case ARGI_INTEGER_REF: 552 case ARGI_OBJECT_REF: 553 case ARGI_DEVICE_REF: 554 555 switch (ArgOp->Asl.ParseOpcode) 556 { 557 case PARSEOP_LOCAL0: 558 case PARSEOP_LOCAL1: 559 case PARSEOP_LOCAL2: 560 case PARSEOP_LOCAL3: 561 case PARSEOP_LOCAL4: 562 case PARSEOP_LOCAL5: 563 case PARSEOP_LOCAL6: 564 case PARSEOP_LOCAL7: 565 566 /* TBD: implement analysis of current value (type) of the local */ 567 /* For now, just treat any local as a typematch */ 568 569 /*ThisNodeBtype = RequiredBtypes;*/ 570 break; 571 572 case PARSEOP_ARG0: 573 case PARSEOP_ARG1: 574 case PARSEOP_ARG2: 575 case PARSEOP_ARG3: 576 case PARSEOP_ARG4: 577 case PARSEOP_ARG5: 578 case PARSEOP_ARG6: 579 580 /* Hard to analyze argument types, so we won't */ 581 /* for now. Just treat any arg as a typematch */ 582 583 /* ThisNodeBtype = RequiredBtypes; */ 584 break; 585 586 case PARSEOP_DEBUG: 587 case PARSEOP_REFOF: 588 case PARSEOP_INDEX: 589 default: 590 591 break; 592 } 593 break; 594 #endif 595 case ARGI_INTEGER: 596 default: 597 598 break; 599 } 600 601 602 /* Check for a type mismatch (required versus actual) */ 603 604 CommonBtypes = ThisNodeBtype & RequiredBtypes; 605 606 if (ArgOp->Asl.ParseOpcode == PARSEOP_METHODCALL) 607 { 608 if (AnIsInternalMethod (ArgOp)) 609 { 610 return (AE_OK); 611 } 612 613 /* Check a method call for a valid return value */ 614 615 AnCheckMethodReturnValue (Op, OpInfo, ArgOp, 616 RequiredBtypes, ThisNodeBtype); 617 } 618 619 /* 620 * Now check if the actual type(s) match at least one 621 * bit to the required type 622 */ 623 else if (!CommonBtypes) 624 { 625 /* No match -- this is a type mismatch error */ 626 627 AnFormatBtype (AslGbl_StringBuffer, ThisNodeBtype); 628 AnFormatBtype (AslGbl_StringBuffer2, RequiredBtypes); 629 630 sprintf (AslGbl_MsgBuffer, "[%s] found, %s operator requires [%s]", 631 AslGbl_StringBuffer, OpInfo->Name, AslGbl_StringBuffer2); 632 633 AslError (ASL_ERROR, ASL_MSG_INVALID_TYPE, 634 ArgOp, AslGbl_MsgBuffer); 635 } 636 637 NextArgument: 638 ArgOp = ArgOp->Asl.Next; 639 INCREMENT_ARG_LIST (RuntimeArgTypes2); 640 } 641 break; 642 643 default: 644 645 break; 646 } 647 648 return (AE_OK); 649 } 650 651 652 /******************************************************************************* 653 * 654 * FUNCTION: AnOtherSemanticAnalysisWalkBegin 655 * 656 * PARAMETERS: ASL_WALK_CALLBACK 657 * 658 * RETURN: Status 659 * 660 * DESCRIPTION: Descending callback for the analysis walk. Checks for 661 * miscellaneous issues in the code. 662 * 663 ******************************************************************************/ 664 665 ACPI_STATUS 666 AnOtherSemanticAnalysisWalkBegin ( 667 ACPI_PARSE_OBJECT *Op, 668 UINT32 Level, 669 void *Context) 670 { 671 ACPI_PARSE_OBJECT *ArgOp; 672 ACPI_PARSE_OBJECT *PrevArgOp = NULL; 673 const ACPI_OPCODE_INFO *OpInfo; 674 ACPI_NAMESPACE_NODE *Node; 675 676 677 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode); 678 679 680 if (OpInfo->Flags & AML_CREATE) 681 { 682 /* This group contains all of the Create Buffer Field operators */ 683 684 AnValidateCreateBufferField (Op); 685 return (AE_OK); 686 } 687 688 /* 689 * Determine if an execution class operator actually does something by 690 * checking if it has a target and/or the function return value is used. 691 * (Target is optional, so a standalone statement can actually do nothing.) 692 */ 693 if ((OpInfo->Class == AML_CLASS_EXECUTE) && 694 (OpInfo->Flags & AML_HAS_RETVAL) && 695 (!AnIsResultUsed (Op))) 696 { 697 if (OpInfo->Flags & AML_HAS_TARGET) 698 { 699 /* 700 * Find the target node, it is always the last child. If the target 701 * is not specified in the ASL, a default node of type Zero was 702 * created by the parser. 703 */ 704 ArgOp = Op->Asl.Child; 705 while (ArgOp->Asl.Next) 706 { 707 PrevArgOp = ArgOp; 708 ArgOp = ArgOp->Asl.Next; 709 } 710 711 /* Divide() is the only weird case, it has two targets */ 712 713 if (Op->Asl.AmlOpcode == AML_DIVIDE_OP) 714 { 715 if ((ArgOp->Asl.ParseOpcode == PARSEOP_ZERO) && 716 (PrevArgOp) && 717 (PrevArgOp->Asl.ParseOpcode == PARSEOP_ZERO)) 718 { 719 AslError (ASL_ERROR, ASL_MSG_RESULT_NOT_USED, 720 Op, Op->Asl.ExternalName); 721 } 722 } 723 724 else if (ArgOp->Asl.ParseOpcode == PARSEOP_ZERO) 725 { 726 AslError (ASL_ERROR, ASL_MSG_RESULT_NOT_USED, 727 Op, Op->Asl.ExternalName); 728 } 729 } 730 else 731 { 732 /* 733 * Has no target and the result is not used. Only a couple opcodes 734 * can have this combination. 735 */ 736 switch (Op->Asl.ParseOpcode) 737 { 738 case PARSEOP_ACQUIRE: 739 case PARSEOP_WAIT: 740 case PARSEOP_LOADTABLE: 741 742 break; 743 744 default: 745 746 AslError (ASL_ERROR, ASL_MSG_RESULT_NOT_USED, 747 Op, Op->Asl.ExternalName); 748 break; 749 } 750 } 751 } 752 753 /* 754 * Semantic checks for individual ASL operators 755 */ 756 757 switch (Op->Asl.ParseOpcode) 758 { 759 case PARSEOP_STORE: 760 761 if (AslGbl_DoTypechecking) 762 { 763 AnAnalyzeStoreOperator (Op); 764 } 765 break; 766 767 768 case PARSEOP_ACQUIRE: 769 case PARSEOP_WAIT: 770 /* 771 * Emit a warning if the timeout parameter for these operators is not 772 * ACPI_WAIT_FOREVER, and the result value from the operator is not 773 * checked, meaning that a timeout could happen, but the code 774 * would not know about it. 775 */ 776 777 /* First child is the namepath, 2nd child is timeout */ 778 779 ArgOp = Op->Asl.Child; 780 ArgOp = ArgOp->Asl.Next; 781 782 /* 783 * Check for the WAIT_FOREVER case - defined by the ACPI spec to be 784 * 0xFFFF or greater 785 */ 786 if (((ArgOp->Asl.ParseOpcode == PARSEOP_WORDCONST) || 787 (ArgOp->Asl.ParseOpcode == PARSEOP_INTEGER)) && 788 (ArgOp->Asl.Value.Integer >= (UINT64) ACPI_WAIT_FOREVER)) 789 { 790 break; 791 } 792 793 /* 794 * The operation could timeout. If the return value is not used 795 * (indicates timeout occurred), issue a warning 796 */ 797 if (!AnIsResultUsed (Op)) 798 { 799 AslError (ASL_WARNING, ASL_MSG_TIMEOUT, ArgOp, 800 Op->Asl.ExternalName); 801 } 802 break; 803 804 case PARSEOP_CONNECTION: 805 /* 806 * Ensure that the referenced operation region has the correct SPACE_ID. 807 * From the grammar/parser, we know the parent is a FIELD definition. 808 */ 809 ArgOp = Op->Asl.Parent; /* Field definition */ 810 ArgOp = ArgOp->Asl.Child; /* First child is the OpRegion Name */ 811 Node = ArgOp->Asl.Node; /* OpRegion namespace node */ 812 if (!Node) 813 { 814 break; 815 } 816 817 ArgOp = Node->Op; /* OpRegion definition */ 818 ArgOp = ArgOp->Asl.Child; /* First child is the OpRegion Name */ 819 ArgOp = ArgOp->Asl.Next; /* Next peer is the SPACE_ID (what we want) */ 820 821 /* 822 * The Connection() operator is only valid for the following operation 823 * region SpaceIds: GeneralPurposeIo and GenericSerialBus. 824 */ 825 if ((ArgOp->Asl.Value.Integer != ACPI_ADR_SPACE_GPIO) && 826 (ArgOp->Asl.Value.Integer != ACPI_ADR_SPACE_GSBUS)) 827 { 828 AslError (ASL_ERROR, ASL_MSG_CONNECTION_INVALID, Op, NULL); 829 } 830 break; 831 832 case PARSEOP_FIELD: 833 /* 834 * Ensure that fields for GeneralPurposeIo and GenericSerialBus 835 * contain at least one Connection() operator 836 */ 837 ArgOp = Op->Asl.Child; /* 1st child is the OpRegion Name */ 838 Node = ArgOp->Asl.Node; /* OpRegion namespace node */ 839 if (!Node) 840 { 841 break; 842 } 843 844 ArgOp = Node->Op; /* OpRegion definition */ 845 ArgOp = ArgOp->Asl.Child; /* First child is the OpRegion Name */ 846 ArgOp = ArgOp->Asl.Next; /* Next peer is the SPACE_ID (what we want) */ 847 848 /* We are only interested in GeneralPurposeIo and GenericSerialBus */ 849 850 if ((ArgOp->Asl.Value.Integer != ACPI_ADR_SPACE_GPIO) && 851 (ArgOp->Asl.Value.Integer != ACPI_ADR_SPACE_GSBUS)) 852 { 853 break; 854 } 855 856 ArgOp = Op->Asl.Child; /* 1st child is the OpRegion Name */ 857 ArgOp = ArgOp->Asl.Next; /* AccessType */ 858 ArgOp = ArgOp->Asl.Next; /* LockRule */ 859 ArgOp = ArgOp->Asl.Next; /* UpdateRule */ 860 ArgOp = ArgOp->Asl.Next; /* Start of FieldUnitList */ 861 862 /* Walk the FieldUnitList */ 863 864 while (ArgOp) 865 { 866 if (ArgOp->Asl.ParseOpcode == PARSEOP_CONNECTION) 867 { 868 break; 869 } 870 else if (ArgOp->Asl.ParseOpcode == PARSEOP_NAMESEG) 871 { 872 AslError (ASL_ERROR, ASL_MSG_CONNECTION_MISSING, ArgOp, NULL); 873 break; 874 } 875 876 ArgOp = ArgOp->Asl.Next; 877 } 878 break; 879 880 default: 881 882 break; 883 } 884 885 return (AE_OK); 886 } 887 888 889 /******************************************************************************* 890 * 891 * FUNCTION: AnValidateCreateBufferField 892 * 893 * PARAMETERS: Op - A create buffer field operator 894 * 895 * RETURN: None 896 * 897 * DESCRIPTION: Check if a buffer index argument to a create buffer field 898 * operation is beyond the end of the target buffer. 899 * 900 * Validates these AML operators: 901 * 902 * AML_CREATE_FIELD_OP 903 * AML_CREATE_BIT_FIELD_OP 904 * AML_CREATE_BYTE_FIELD_OP 905 * AML_CREATE_WORD_FIELD_OP 906 * AML_CREATE_DWORD_FIELD_OP 907 * AML_CREATE_QWORD_FIELD_OP 908 * 909 * There are two conditions that must be satisfied in order to enable 910 * validation at compile time: 911 * 912 * 1) The length of the target buffer must be an integer constant 913 * 2) The index specified in the create* must be an integer constant 914 * 3) For CreateField, the bit length argument must be non-zero. 915 * 916 ******************************************************************************/ 917 918 static void 919 AnValidateCreateBufferField ( 920 ACPI_PARSE_OBJECT *CreateBufferFieldOp) 921 { 922 ACPI_PARSE_OBJECT *TargetBufferOp; 923 ACPI_PARSE_OBJECT *ArgOp; 924 UINT32 TargetBufferLength; 925 UINT32 LastFieldByteIndex; 926 927 928 /* 929 * 1) Get the length of the target buffer 930 */ 931 ArgOp = CreateBufferFieldOp->Asl.Child; /* Reference to target buffer */ 932 933 /* 934 * If no attached Node, the target buffer may be something like an 935 * ArgX or LocalX and cannot be evaluated at compile time. 936 */ 937 if (!ArgOp->Asl.Node) 938 { 939 return; 940 } 941 942 TargetBufferOp = ArgOp->Asl.Node->Op; 943 TargetBufferOp = TargetBufferOp->Asl.Child; /* Target buffer */ 944 TargetBufferOp = TargetBufferOp->Asl.Next; /* "Buffer" keyword */ 945 if (!TargetBufferOp) 946 { 947 /* Not a statement of the form NAME(XXXX, Buffer.... */ 948 949 return; 950 } 951 952 /* Get the buffer length argument. It must be an integer constant */ 953 954 ArgOp = TargetBufferOp->Asl.Child; 955 if (!AnIsValidBufferConstant (ArgOp)) 956 { 957 return; 958 } 959 960 TargetBufferLength = (UINT32) ArgOp->Asl.Value.Integer; 961 962 /* 963 * 2) Get the value of the buffer index argument. It must be 964 * an integer constant. 965 */ 966 ArgOp = CreateBufferFieldOp->Asl.Child; /* Reference to target buffer */ 967 ArgOp = ArgOp->Asl.Next; /* Buffer Index argument*/ 968 if (!AnIsValidBufferConstant (ArgOp)) 969 { 970 return; 971 } 972 973 LastFieldByteIndex = 974 (UINT32) ArgOp->Asl.Value.Integer; /* Index can be in either bytes or bits */ 975 976 /* 977 * 3) Get the length of the new buffer field, in bytes. Also, 978 * create the final target buffer index for the last byte of the field 979 */ 980 switch (CreateBufferFieldOp->Asl.ParseOpcode) 981 { 982 case PARSEOP_CREATEBITFIELD: /* A one bit field */ 983 984 LastFieldByteIndex = ACPI_ROUND_BITS_DOWN_TO_BYTES (LastFieldByteIndex); 985 break; 986 987 case PARSEOP_CREATEBYTEFIELD: 988 break; 989 990 case PARSEOP_CREATEWORDFIELD: 991 992 LastFieldByteIndex += (sizeof (UINT16) - 1); 993 break; 994 995 case PARSEOP_CREATEDWORDFIELD: 996 997 LastFieldByteIndex += (sizeof (UINT32) - 1); 998 break; 999 1000 case PARSEOP_CREATEQWORDFIELD: 1001 1002 LastFieldByteIndex += (sizeof (UINT64) - 1); 1003 break; 1004 1005 case PARSEOP_CREATEFIELD: /* Multi-bit field */ 1006 1007 ArgOp = ArgOp->Asl.Next; /* Length argument, in bits */ 1008 if (!AnIsValidBufferConstant (ArgOp)) 1009 { 1010 return; 1011 } 1012 1013 /* The buffer field length is not allowed to be zero */ 1014 1015 if (ArgOp->Asl.Value.Integer == 0) 1016 { 1017 AslError (ASL_WARNING, ASL_MSG_BUFFER_FIELD_LENGTH, ArgOp, NULL); 1018 return; 1019 } 1020 1021 LastFieldByteIndex += 1022 ((UINT32) ArgOp->Asl.Value.Integer - 1); /* Create final bit index */ 1023 1024 /* Convert bit index to a byte index */ 1025 1026 LastFieldByteIndex = ACPI_ROUND_BITS_DOWN_TO_BYTES (LastFieldByteIndex); 1027 break; 1028 1029 default: 1030 return; 1031 } 1032 1033 /* 1034 * 4) Check for an access (index) beyond the end of the target buffer, 1035 * or a zero length target buffer. 1036 */ 1037 if (!TargetBufferLength || (LastFieldByteIndex >= TargetBufferLength)) 1038 { 1039 AslError (ASL_WARNING, ASL_MSG_BUFFER_FIELD_OVERFLOW, ArgOp, NULL); 1040 } 1041 } 1042 1043 1044 /******************************************************************************* 1045 * 1046 * FUNCTION: AnIsValidBufferConstant 1047 * 1048 * PARAMETERS: Op - A buffer-related operand 1049 * 1050 * RETURN: TRUE if operand is valid constant, FALSE otherwise 1051 * 1052 * DESCRIPTION: Check if the input Op is valid constant that can be used 1053 * in compile-time analysis. 1054 * 1055 ******************************************************************************/ 1056 1057 static BOOLEAN 1058 AnIsValidBufferConstant ( 1059 ACPI_PARSE_OBJECT *Op) 1060 { 1061 if (!Op) 1062 { 1063 return (FALSE); 1064 } 1065 1066 if ((Op->Asl.ParseOpcode == PARSEOP_INTEGER) || 1067 (Op->Asl.ParseOpcode == PARSEOP_ZERO) || 1068 (Op->Asl.ParseOpcode == PARSEOP_ONE)) 1069 { 1070 return (TRUE); 1071 } 1072 1073 return (FALSE); 1074 } 1075 1076 1077 /******************************************************************************* 1078 * 1079 * FUNCTION: AnAnalyzeStoreOperator 1080 * 1081 * PARAMETERS: Op - Store() operator 1082 * 1083 * RETURN: None 1084 * 1085 * DESCRIPTION: Analyze a store operator. Mostly for stores to/from package 1086 * objects where there are more restrictions than other data 1087 * types. 1088 * 1089 ******************************************************************************/ 1090 1091 static void 1092 AnAnalyzeStoreOperator ( 1093 ACPI_PARSE_OBJECT *Op) 1094 { 1095 ACPI_NAMESPACE_NODE *SourceNode; 1096 ACPI_NAMESPACE_NODE *TargetNode; 1097 ACPI_PARSE_OBJECT *SourceOperandOp; 1098 ACPI_PARSE_OBJECT *TargetOperandOp; 1099 UINT32 SourceOperandBtype; 1100 UINT32 TargetOperandBtype; 1101 1102 1103 /* Extract the two operands for STORE */ 1104 1105 SourceOperandOp = Op->Asl.Child; 1106 TargetOperandOp = SourceOperandOp->Asl.Next; 1107 1108 /* 1109 * Ignore these Source operand opcodes, they cannot be typechecked, 1110 * the actual result is unknown here. 1111 */ 1112 switch (SourceOperandOp->Asl.ParseOpcode) 1113 { 1114 /* For these, type of the returned value is unknown at compile time */ 1115 1116 case PARSEOP_DEREFOF: 1117 case PARSEOP_METHODCALL: 1118 case PARSEOP_STORE: 1119 case PARSEOP_COPYOBJECT: 1120 1121 return; 1122 1123 case PARSEOP_INDEX: 1124 case PARSEOP_REFOF: 1125 1126 if (!AslGbl_EnableReferenceTypechecking) 1127 { 1128 return; 1129 } 1130 1131 /* 1132 * These opcodes always return an object reference, and thus 1133 * the result can only be stored to a Local, Arg, or Debug. 1134 */ 1135 if (TargetOperandOp->Asl.AmlOpcode == AML_DEBUG_OP) 1136 { 1137 return; 1138 } 1139 1140 if ((TargetOperandOp->Asl.AmlOpcode < AML_LOCAL0) || 1141 (TargetOperandOp->Asl.AmlOpcode > AML_ARG6)) 1142 { 1143 AslError (ASL_ERROR, ASL_MSG_INVALID_TYPE, TargetOperandOp, 1144 "Source [Reference], Target must be [Local/Arg/Debug]"); 1145 } 1146 return; 1147 1148 default: 1149 break; 1150 } 1151 1152 /* 1153 * Ignore these Target operand opcodes, they cannot be typechecked 1154 */ 1155 switch (TargetOperandOp->Asl.ParseOpcode) 1156 { 1157 case PARSEOP_DEBUG: 1158 case PARSEOP_DEREFOF: 1159 case PARSEOP_REFOF: 1160 case PARSEOP_INDEX: 1161 case PARSEOP_STORE: 1162 1163 return; 1164 1165 default: 1166 break; 1167 } 1168 1169 /* 1170 * Ignore typecheck for External() operands of type "UnknownObj", 1171 * we don't know the actual type (source or target). 1172 */ 1173 SourceNode = SourceOperandOp->Asl.Node; 1174 if (SourceNode && 1175 (SourceNode->Flags & ANOBJ_IS_EXTERNAL) && 1176 (SourceNode->Type == ACPI_TYPE_ANY)) 1177 { 1178 return; 1179 } 1180 1181 TargetNode = TargetOperandOp->Asl.Node; 1182 if (TargetNode && 1183 (TargetNode->Flags & ANOBJ_IS_EXTERNAL) && 1184 (TargetNode->Type == ACPI_TYPE_ANY)) 1185 { 1186 return; 1187 } 1188 1189 /* 1190 * A NULL node with a namepath AML opcode indicates non-existent 1191 * name. Just return, the error message is generated elsewhere. 1192 */ 1193 if ((!SourceNode && (SourceOperandOp->Asl.AmlOpcode == AML_INT_NAMEPATH_OP)) || 1194 (!TargetNode && (TargetOperandOp->Asl.AmlOpcode == AML_INT_NAMEPATH_OP))) 1195 { 1196 return; 1197 } 1198 1199 /* 1200 * Simple check for source same as target via NS node. 1201 * -- Could be expanded to locals and args. 1202 */ 1203 if (SourceNode && TargetNode) 1204 { 1205 if (SourceNode == TargetNode) 1206 { 1207 AslError (ASL_WARNING, ASL_MSG_DUPLICATE_ITEM, 1208 TargetOperandOp, "Source is the same as Target"); 1209 return; 1210 } 1211 } 1212 1213 /* Ignore typecheck if either source or target is a local or arg */ 1214 1215 if ((SourceOperandOp->Asl.AmlOpcode >= AML_LOCAL0) && 1216 (SourceOperandOp->Asl.AmlOpcode <= AML_ARG6)) 1217 { 1218 return; /* Cannot type a local/arg at compile time */ 1219 } 1220 1221 if ((TargetOperandOp->Asl.AmlOpcode >= AML_LOCAL0) && 1222 (TargetOperandOp->Asl.AmlOpcode <= AML_ARG6)) 1223 { 1224 return; /* Cannot type a local/arg at compile time */ 1225 } 1226 1227 /* 1228 * Package objects are a special case because they cannot by implicitly 1229 * converted to/from anything. Check for these two illegal cases: 1230 * 1231 * Store (non-package, package) 1232 * Store (package, non-package) 1233 */ 1234 SourceOperandBtype = AnGetBtype (SourceOperandOp); 1235 TargetOperandBtype = AnGetBtype (TargetOperandOp); 1236 1237 /* Check source first for (package, non-package) case */ 1238 1239 if (SourceOperandBtype & ACPI_BTYPE_PACKAGE) 1240 { 1241 /* If Source is PACKAGE-->Target must be PACKAGE */ 1242 1243 if (!(TargetOperandBtype & ACPI_BTYPE_PACKAGE)) 1244 { 1245 AslError (ASL_ERROR, ASL_MSG_INVALID_TYPE, TargetOperandOp, 1246 "Source is [Package], Target must be a package also"); 1247 } 1248 } 1249 1250 /* Else check target for (non-package, package) case */ 1251 1252 else if (TargetOperandBtype & ACPI_BTYPE_PACKAGE) 1253 { 1254 /* If Target is PACKAGE, Source must be PACKAGE */ 1255 1256 if (!(SourceOperandBtype & ACPI_BTYPE_PACKAGE)) 1257 { 1258 AslError (ASL_ERROR, ASL_MSG_INVALID_TYPE, SourceOperandOp, 1259 "Target is [Package], Source must be a package also"); 1260 } 1261 } 1262 } 1263