1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /****************************************************************************** 3 * 4 * Module Name: psargs - Parse AML opcode arguments 5 * 6 * Copyright (C) 2000 - 2021, Intel Corp. 7 * 8 *****************************************************************************/ 9 10 #include <acpi/acpi.h> 11 #include "accommon.h" 12 #include "acparser.h" 13 #include "amlcode.h" 14 #include "acnamesp.h" 15 #include "acdispat.h" 16 #include "acconvert.h" 17 18 #define _COMPONENT ACPI_PARSER 19 ACPI_MODULE_NAME("psargs") 20 21 /* Local prototypes */ 22 static u32 23 acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state); 24 25 static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state 26 *parser_state); 27 28 /******************************************************************************* 29 * 30 * FUNCTION: acpi_ps_get_next_package_length 31 * 32 * PARAMETERS: parser_state - Current parser state object 33 * 34 * RETURN: Decoded package length. On completion, the AML pointer points 35 * past the length byte or bytes. 36 * 37 * DESCRIPTION: Decode and return a package length field. 38 * Note: Largest package length is 28 bits, from ACPI specification 39 * 40 ******************************************************************************/ 41 42 static u32 43 acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state) 44 { 45 u8 *aml = parser_state->aml; 46 u32 package_length = 0; 47 u32 byte_count; 48 u8 byte_zero_mask = 0x3F; /* Default [0:5] */ 49 50 ACPI_FUNCTION_TRACE(ps_get_next_package_length); 51 52 /* 53 * Byte 0 bits [6:7] contain the number of additional bytes 54 * used to encode the package length, either 0,1,2, or 3 55 */ 56 byte_count = (aml[0] >> 6); 57 parser_state->aml += ((acpi_size)byte_count + 1); 58 59 /* Get bytes 3, 2, 1 as needed */ 60 61 while (byte_count) { 62 /* 63 * Final bit positions for the package length bytes: 64 * Byte3->[20:27] 65 * Byte2->[12:19] 66 * Byte1->[04:11] 67 * Byte0->[00:03] 68 */ 69 package_length |= (aml[byte_count] << ((byte_count << 3) - 4)); 70 71 byte_zero_mask = 0x0F; /* Use bits [0:3] of byte 0 */ 72 byte_count--; 73 } 74 75 /* Byte 0 is a special case, either bits [0:3] or [0:5] are used */ 76 77 package_length |= (aml[0] & byte_zero_mask); 78 return_UINT32(package_length); 79 } 80 81 /******************************************************************************* 82 * 83 * FUNCTION: acpi_ps_get_next_package_end 84 * 85 * PARAMETERS: parser_state - Current parser state object 86 * 87 * RETURN: Pointer to end-of-package +1 88 * 89 * DESCRIPTION: Get next package length and return a pointer past the end of 90 * the package. Consumes the package length field 91 * 92 ******************************************************************************/ 93 94 u8 *acpi_ps_get_next_package_end(struct acpi_parse_state *parser_state) 95 { 96 u8 *start = parser_state->aml; 97 u32 package_length; 98 99 ACPI_FUNCTION_TRACE(ps_get_next_package_end); 100 101 /* Function below updates parser_state->Aml */ 102 103 package_length = acpi_ps_get_next_package_length(parser_state); 104 105 return_PTR(start + package_length); /* end of package */ 106 } 107 108 /******************************************************************************* 109 * 110 * FUNCTION: acpi_ps_get_next_namestring 111 * 112 * PARAMETERS: parser_state - Current parser state object 113 * 114 * RETURN: Pointer to the start of the name string (pointer points into 115 * the AML. 116 * 117 * DESCRIPTION: Get next raw namestring within the AML stream. Handles all name 118 * prefix characters. Set parser state to point past the string. 119 * (Name is consumed from the AML.) 120 * 121 ******************************************************************************/ 122 123 char *acpi_ps_get_next_namestring(struct acpi_parse_state *parser_state) 124 { 125 u8 *start = parser_state->aml; 126 u8 *end = parser_state->aml; 127 128 ACPI_FUNCTION_TRACE(ps_get_next_namestring); 129 130 /* Point past any namestring prefix characters (backslash or carat) */ 131 132 while (ACPI_IS_ROOT_PREFIX(*end) || ACPI_IS_PARENT_PREFIX(*end)) { 133 end++; 134 } 135 136 /* Decode the path prefix character */ 137 138 switch (*end) { 139 case 0: 140 141 /* null_name */ 142 143 if (end == start) { 144 start = NULL; 145 } 146 end++; 147 break; 148 149 case AML_DUAL_NAME_PREFIX: 150 151 /* Two name segments */ 152 153 end += 1 + (2 * ACPI_NAMESEG_SIZE); 154 break; 155 156 case AML_MULTI_NAME_PREFIX: 157 158 /* Multiple name segments, 4 chars each, count in next byte */ 159 160 end += 2 + (*(end + 1) * ACPI_NAMESEG_SIZE); 161 break; 162 163 default: 164 165 /* Single name segment */ 166 167 end += ACPI_NAMESEG_SIZE; 168 break; 169 } 170 171 parser_state->aml = end; 172 return_PTR((char *)start); 173 } 174 175 /******************************************************************************* 176 * 177 * FUNCTION: acpi_ps_get_next_namepath 178 * 179 * PARAMETERS: parser_state - Current parser state object 180 * arg - Where the namepath will be stored 181 * arg_count - If the namepath points to a control method 182 * the method's argument is returned here. 183 * possible_method_call - Whether the namepath can possibly be the 184 * start of a method call 185 * 186 * RETURN: Status 187 * 188 * DESCRIPTION: Get next name (if method call, return # of required args). 189 * Names are looked up in the internal namespace to determine 190 * if the name represents a control method. If a method 191 * is found, the number of arguments to the method is returned. 192 * This information is critical for parsing to continue correctly. 193 * 194 ******************************************************************************/ 195 196 acpi_status 197 acpi_ps_get_next_namepath(struct acpi_walk_state *walk_state, 198 struct acpi_parse_state *parser_state, 199 union acpi_parse_object *arg, u8 possible_method_call) 200 { 201 acpi_status status; 202 char *path; 203 union acpi_parse_object *name_op; 204 union acpi_operand_object *method_desc; 205 struct acpi_namespace_node *node; 206 u8 *start = parser_state->aml; 207 208 ACPI_FUNCTION_TRACE(ps_get_next_namepath); 209 210 path = acpi_ps_get_next_namestring(parser_state); 211 acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP); 212 213 /* Null path case is allowed, just exit */ 214 215 if (!path) { 216 arg->common.value.name = path; 217 return_ACPI_STATUS(AE_OK); 218 } 219 220 /* 221 * Lookup the name in the internal namespace, starting with the current 222 * scope. We don't want to add anything new to the namespace here, 223 * however, so we use MODE_EXECUTE. 224 * Allow searching of the parent tree, but don't open a new scope - 225 * we just want to lookup the object (must be mode EXECUTE to perform 226 * the upsearch) 227 */ 228 status = acpi_ns_lookup(walk_state->scope_info, path, 229 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE, 230 ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, 231 NULL, &node); 232 233 /* 234 * If this name is a control method invocation, we must 235 * setup the method call 236 */ 237 if (ACPI_SUCCESS(status) && 238 possible_method_call && (node->type == ACPI_TYPE_METHOD)) { 239 if ((GET_CURRENT_ARG_TYPE(walk_state->arg_types) == 240 ARGP_SUPERNAME) 241 || (GET_CURRENT_ARG_TYPE(walk_state->arg_types) == 242 ARGP_TARGET)) { 243 /* 244 * acpi_ps_get_next_namestring has increased the AML pointer past 245 * the method invocation namestring, so we need to restore the 246 * saved AML pointer back to the original method invocation 247 * namestring. 248 */ 249 walk_state->parser_state.aml = start; 250 walk_state->arg_count = 1; 251 acpi_ps_init_op(arg, AML_INT_METHODCALL_OP); 252 } 253 254 /* This name is actually a control method invocation */ 255 256 method_desc = acpi_ns_get_attached_object(node); 257 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, 258 "Control Method invocation %4.4s - %p Desc %p Path=%p\n", 259 node->name.ascii, node, method_desc, path)); 260 261 name_op = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP, start); 262 if (!name_op) { 263 return_ACPI_STATUS(AE_NO_MEMORY); 264 } 265 266 /* Change Arg into a METHOD CALL and attach name to it */ 267 268 acpi_ps_init_op(arg, AML_INT_METHODCALL_OP); 269 name_op->common.value.name = path; 270 271 /* Point METHODCALL/NAME to the METHOD Node */ 272 273 name_op->common.node = node; 274 acpi_ps_append_arg(arg, name_op); 275 276 if (!method_desc) { 277 ACPI_ERROR((AE_INFO, 278 "Control Method %p has no attached object", 279 node)); 280 return_ACPI_STATUS(AE_AML_INTERNAL); 281 } 282 283 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, 284 "Control Method - %p Args %X\n", 285 node, method_desc->method.param_count)); 286 287 /* Get the number of arguments to expect */ 288 289 walk_state->arg_count = method_desc->method.param_count; 290 return_ACPI_STATUS(AE_OK); 291 } 292 293 /* 294 * Special handling if the name was not found during the lookup - 295 * some not_found cases are allowed 296 */ 297 if (status == AE_NOT_FOUND) { 298 299 /* 1) not_found is ok during load pass 1/2 (allow forward references) */ 300 301 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) != 302 ACPI_PARSE_EXECUTE) { 303 status = AE_OK; 304 } 305 306 /* 2) not_found during a cond_ref_of(x) is ok by definition */ 307 308 else if (walk_state->op->common.aml_opcode == 309 AML_CONDITIONAL_REF_OF_OP) { 310 status = AE_OK; 311 } 312 313 /* 314 * 3) not_found while building a Package is ok at this point, we 315 * may flag as an error later if slack mode is not enabled. 316 * (Some ASL code depends on allowing this behavior) 317 */ 318 else if ((arg->common.parent) && 319 ((arg->common.parent->common.aml_opcode == 320 AML_PACKAGE_OP) 321 || (arg->common.parent->common.aml_opcode == 322 AML_VARIABLE_PACKAGE_OP))) { 323 status = AE_OK; 324 } 325 } 326 327 /* Final exception check (may have been changed from code above) */ 328 329 if (ACPI_FAILURE(status)) { 330 ACPI_ERROR_NAMESPACE(walk_state->scope_info, path, status); 331 332 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) == 333 ACPI_PARSE_EXECUTE) { 334 335 /* Report a control method execution error */ 336 337 status = acpi_ds_method_error(status, walk_state); 338 } 339 } 340 341 /* Save the namepath */ 342 343 arg->common.value.name = path; 344 return_ACPI_STATUS(status); 345 } 346 347 /******************************************************************************* 348 * 349 * FUNCTION: acpi_ps_get_next_simple_arg 350 * 351 * PARAMETERS: parser_state - Current parser state object 352 * arg_type - The argument type (AML_*_ARG) 353 * arg - Where the argument is returned 354 * 355 * RETURN: None 356 * 357 * DESCRIPTION: Get the next simple argument (constant, string, or namestring) 358 * 359 ******************************************************************************/ 360 361 void 362 acpi_ps_get_next_simple_arg(struct acpi_parse_state *parser_state, 363 u32 arg_type, union acpi_parse_object *arg) 364 { 365 u32 length; 366 u16 opcode; 367 u8 *aml = parser_state->aml; 368 369 ACPI_FUNCTION_TRACE_U32(ps_get_next_simple_arg, arg_type); 370 371 switch (arg_type) { 372 case ARGP_BYTEDATA: 373 374 /* Get 1 byte from the AML stream */ 375 376 opcode = AML_BYTE_OP; 377 arg->common.value.integer = (u64) *aml; 378 length = 1; 379 break; 380 381 case ARGP_WORDDATA: 382 383 /* Get 2 bytes from the AML stream */ 384 385 opcode = AML_WORD_OP; 386 ACPI_MOVE_16_TO_64(&arg->common.value.integer, aml); 387 length = 2; 388 break; 389 390 case ARGP_DWORDDATA: 391 392 /* Get 4 bytes from the AML stream */ 393 394 opcode = AML_DWORD_OP; 395 ACPI_MOVE_32_TO_64(&arg->common.value.integer, aml); 396 length = 4; 397 break; 398 399 case ARGP_QWORDDATA: 400 401 /* Get 8 bytes from the AML stream */ 402 403 opcode = AML_QWORD_OP; 404 ACPI_MOVE_64_TO_64(&arg->common.value.integer, aml); 405 length = 8; 406 break; 407 408 case ARGP_CHARLIST: 409 410 /* Get a pointer to the string, point past the string */ 411 412 opcode = AML_STRING_OP; 413 arg->common.value.string = ACPI_CAST_PTR(char, aml); 414 415 /* Find the null terminator */ 416 417 length = 0; 418 while (aml[length]) { 419 length++; 420 } 421 length++; 422 break; 423 424 case ARGP_NAME: 425 case ARGP_NAMESTRING: 426 427 acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP); 428 arg->common.value.name = 429 acpi_ps_get_next_namestring(parser_state); 430 return_VOID; 431 432 default: 433 434 ACPI_ERROR((AE_INFO, "Invalid ArgType 0x%X", arg_type)); 435 return_VOID; 436 } 437 438 acpi_ps_init_op(arg, opcode); 439 parser_state->aml += length; 440 return_VOID; 441 } 442 443 /******************************************************************************* 444 * 445 * FUNCTION: acpi_ps_get_next_field 446 * 447 * PARAMETERS: parser_state - Current parser state object 448 * 449 * RETURN: A newly allocated FIELD op 450 * 451 * DESCRIPTION: Get next field (named_field, reserved_field, or access_field) 452 * 453 ******************************************************************************/ 454 455 static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state 456 *parser_state) 457 { 458 u8 *aml; 459 union acpi_parse_object *field; 460 union acpi_parse_object *arg = NULL; 461 u16 opcode; 462 u32 name; 463 u8 access_type; 464 u8 access_attribute; 465 u8 access_length; 466 u32 pkg_length; 467 u8 *pkg_end; 468 u32 buffer_length; 469 470 ACPI_FUNCTION_TRACE(ps_get_next_field); 471 472 ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state); 473 aml = parser_state->aml; 474 475 /* Determine field type */ 476 477 switch (ACPI_GET8(parser_state->aml)) { 478 case AML_FIELD_OFFSET_OP: 479 480 opcode = AML_INT_RESERVEDFIELD_OP; 481 parser_state->aml++; 482 break; 483 484 case AML_FIELD_ACCESS_OP: 485 486 opcode = AML_INT_ACCESSFIELD_OP; 487 parser_state->aml++; 488 break; 489 490 case AML_FIELD_CONNECTION_OP: 491 492 opcode = AML_INT_CONNECTION_OP; 493 parser_state->aml++; 494 break; 495 496 case AML_FIELD_EXT_ACCESS_OP: 497 498 opcode = AML_INT_EXTACCESSFIELD_OP; 499 parser_state->aml++; 500 break; 501 502 default: 503 504 opcode = AML_INT_NAMEDFIELD_OP; 505 break; 506 } 507 508 /* Allocate a new field op */ 509 510 field = acpi_ps_alloc_op(opcode, aml); 511 if (!field) { 512 return_PTR(NULL); 513 } 514 515 /* Decode the field type */ 516 517 ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state); 518 switch (opcode) { 519 case AML_INT_NAMEDFIELD_OP: 520 521 /* Get the 4-character name */ 522 523 ACPI_MOVE_32_TO_32(&name, parser_state->aml); 524 acpi_ps_set_name(field, name); 525 parser_state->aml += ACPI_NAMESEG_SIZE; 526 527 ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state); 528 529 #ifdef ACPI_ASL_COMPILER 530 /* 531 * Because the package length isn't represented as a parse tree object, 532 * take comments surrounding this and add to the previously created 533 * parse node. 534 */ 535 if (field->common.inline_comment) { 536 field->common.name_comment = 537 field->common.inline_comment; 538 } 539 field->common.inline_comment = acpi_gbl_current_inline_comment; 540 acpi_gbl_current_inline_comment = NULL; 541 #endif 542 543 /* Get the length which is encoded as a package length */ 544 545 field->common.value.size = 546 acpi_ps_get_next_package_length(parser_state); 547 break; 548 549 case AML_INT_RESERVEDFIELD_OP: 550 551 /* Get the length which is encoded as a package length */ 552 553 field->common.value.size = 554 acpi_ps_get_next_package_length(parser_state); 555 break; 556 557 case AML_INT_ACCESSFIELD_OP: 558 case AML_INT_EXTACCESSFIELD_OP: 559 560 /* 561 * Get access_type and access_attrib and merge into the field Op 562 * access_type is first operand, access_attribute is second. stuff 563 * these bytes into the node integer value for convenience. 564 */ 565 566 /* Get the two bytes (Type/Attribute) */ 567 568 access_type = ACPI_GET8(parser_state->aml); 569 parser_state->aml++; 570 access_attribute = ACPI_GET8(parser_state->aml); 571 parser_state->aml++; 572 573 field->common.value.integer = (u8)access_type; 574 field->common.value.integer |= (u16)(access_attribute << 8); 575 576 /* This opcode has a third byte, access_length */ 577 578 if (opcode == AML_INT_EXTACCESSFIELD_OP) { 579 access_length = ACPI_GET8(parser_state->aml); 580 parser_state->aml++; 581 582 field->common.value.integer |= 583 (u32)(access_length << 16); 584 } 585 break; 586 587 case AML_INT_CONNECTION_OP: 588 589 /* 590 * Argument for Connection operator can be either a Buffer 591 * (resource descriptor), or a name_string. 592 */ 593 aml = parser_state->aml; 594 if (ACPI_GET8(parser_state->aml) == AML_BUFFER_OP) { 595 parser_state->aml++; 596 597 ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state); 598 pkg_end = parser_state->aml; 599 pkg_length = 600 acpi_ps_get_next_package_length(parser_state); 601 pkg_end += pkg_length; 602 603 ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state); 604 if (parser_state->aml < pkg_end) { 605 606 /* Non-empty list */ 607 608 arg = 609 acpi_ps_alloc_op(AML_INT_BYTELIST_OP, aml); 610 if (!arg) { 611 acpi_ps_free_op(field); 612 return_PTR(NULL); 613 } 614 615 /* Get the actual buffer length argument */ 616 617 opcode = ACPI_GET8(parser_state->aml); 618 parser_state->aml++; 619 620 ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state); 621 switch (opcode) { 622 case AML_BYTE_OP: /* AML_BYTEDATA_ARG */ 623 624 buffer_length = 625 ACPI_GET8(parser_state->aml); 626 parser_state->aml += 1; 627 break; 628 629 case AML_WORD_OP: /* AML_WORDDATA_ARG */ 630 631 buffer_length = 632 ACPI_GET16(parser_state->aml); 633 parser_state->aml += 2; 634 break; 635 636 case AML_DWORD_OP: /* AML_DWORDATA_ARG */ 637 638 buffer_length = 639 ACPI_GET32(parser_state->aml); 640 parser_state->aml += 4; 641 break; 642 643 default: 644 645 buffer_length = 0; 646 break; 647 } 648 649 /* Fill in bytelist data */ 650 651 ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state); 652 arg->named.value.size = buffer_length; 653 arg->named.data = parser_state->aml; 654 } 655 656 /* Skip to End of byte data */ 657 658 parser_state->aml = pkg_end; 659 } else { 660 arg = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP, aml); 661 if (!arg) { 662 acpi_ps_free_op(field); 663 return_PTR(NULL); 664 } 665 666 /* Get the Namestring argument */ 667 668 arg->common.value.name = 669 acpi_ps_get_next_namestring(parser_state); 670 } 671 672 /* Link the buffer/namestring to parent (CONNECTION_OP) */ 673 674 acpi_ps_append_arg(field, arg); 675 break; 676 677 default: 678 679 /* Opcode was set in previous switch */ 680 break; 681 } 682 683 return_PTR(field); 684 } 685 686 /******************************************************************************* 687 * 688 * FUNCTION: acpi_ps_get_next_arg 689 * 690 * PARAMETERS: walk_state - Current state 691 * parser_state - Current parser state object 692 * arg_type - The argument type (AML_*_ARG) 693 * return_arg - Where the next arg is returned 694 * 695 * RETURN: Status, and an op object containing the next argument. 696 * 697 * DESCRIPTION: Get next argument (including complex list arguments that require 698 * pushing the parser stack) 699 * 700 ******************************************************************************/ 701 702 acpi_status 703 acpi_ps_get_next_arg(struct acpi_walk_state *walk_state, 704 struct acpi_parse_state *parser_state, 705 u32 arg_type, union acpi_parse_object **return_arg) 706 { 707 union acpi_parse_object *arg = NULL; 708 union acpi_parse_object *prev = NULL; 709 union acpi_parse_object *field; 710 u32 subop; 711 acpi_status status = AE_OK; 712 713 ACPI_FUNCTION_TRACE_PTR(ps_get_next_arg, parser_state); 714 715 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, 716 "Expected argument type ARGP: %s (%2.2X)\n", 717 acpi_ut_get_argument_type_name(arg_type), arg_type)); 718 719 switch (arg_type) { 720 case ARGP_BYTEDATA: 721 case ARGP_WORDDATA: 722 case ARGP_DWORDDATA: 723 case ARGP_CHARLIST: 724 case ARGP_NAME: 725 case ARGP_NAMESTRING: 726 727 /* Constants, strings, and namestrings are all the same size */ 728 729 arg = acpi_ps_alloc_op(AML_BYTE_OP, parser_state->aml); 730 if (!arg) { 731 return_ACPI_STATUS(AE_NO_MEMORY); 732 } 733 734 acpi_ps_get_next_simple_arg(parser_state, arg_type, arg); 735 break; 736 737 case ARGP_PKGLENGTH: 738 739 /* Package length, nothing returned */ 740 741 parser_state->pkg_end = 742 acpi_ps_get_next_package_end(parser_state); 743 break; 744 745 case ARGP_FIELDLIST: 746 747 if (parser_state->aml < parser_state->pkg_end) { 748 749 /* Non-empty list */ 750 751 while (parser_state->aml < parser_state->pkg_end) { 752 field = acpi_ps_get_next_field(parser_state); 753 if (!field) { 754 return_ACPI_STATUS(AE_NO_MEMORY); 755 } 756 757 if (prev) { 758 prev->common.next = field; 759 } else { 760 arg = field; 761 } 762 prev = field; 763 } 764 765 /* Skip to End of byte data */ 766 767 parser_state->aml = parser_state->pkg_end; 768 } 769 break; 770 771 case ARGP_BYTELIST: 772 773 if (parser_state->aml < parser_state->pkg_end) { 774 775 /* Non-empty list */ 776 777 arg = acpi_ps_alloc_op(AML_INT_BYTELIST_OP, 778 parser_state->aml); 779 if (!arg) { 780 return_ACPI_STATUS(AE_NO_MEMORY); 781 } 782 783 /* Fill in bytelist data */ 784 785 arg->common.value.size = (u32) 786 ACPI_PTR_DIFF(parser_state->pkg_end, 787 parser_state->aml); 788 arg->named.data = parser_state->aml; 789 790 /* Skip to End of byte data */ 791 792 parser_state->aml = parser_state->pkg_end; 793 } 794 break; 795 796 case ARGP_SIMPLENAME: 797 case ARGP_NAME_OR_REF: 798 799 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, 800 "**** SimpleName/NameOrRef: %s (%2.2X)\n", 801 acpi_ut_get_argument_type_name(arg_type), 802 arg_type)); 803 804 subop = acpi_ps_peek_opcode(parser_state); 805 if (subop == 0 || 806 acpi_ps_is_leading_char(subop) || 807 ACPI_IS_ROOT_PREFIX(subop) || 808 ACPI_IS_PARENT_PREFIX(subop)) { 809 810 /* null_name or name_string */ 811 812 arg = 813 acpi_ps_alloc_op(AML_INT_NAMEPATH_OP, 814 parser_state->aml); 815 if (!arg) { 816 return_ACPI_STATUS(AE_NO_MEMORY); 817 } 818 819 status = 820 acpi_ps_get_next_namepath(walk_state, parser_state, 821 arg, 822 ACPI_NOT_METHOD_CALL); 823 } else { 824 /* Single complex argument, nothing returned */ 825 826 walk_state->arg_count = 1; 827 } 828 break; 829 830 case ARGP_TARGET: 831 case ARGP_SUPERNAME: 832 833 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, 834 "**** Target/Supername: %s (%2.2X)\n", 835 acpi_ut_get_argument_type_name(arg_type), 836 arg_type)); 837 838 subop = acpi_ps_peek_opcode(parser_state); 839 if (subop == 0 || 840 acpi_ps_is_leading_char(subop) || 841 ACPI_IS_ROOT_PREFIX(subop) || 842 ACPI_IS_PARENT_PREFIX(subop)) { 843 844 /* NULL target (zero). Convert to a NULL namepath */ 845 846 arg = 847 acpi_ps_alloc_op(AML_INT_NAMEPATH_OP, 848 parser_state->aml); 849 if (!arg) { 850 return_ACPI_STATUS(AE_NO_MEMORY); 851 } 852 853 status = 854 acpi_ps_get_next_namepath(walk_state, parser_state, 855 arg, 856 ACPI_POSSIBLE_METHOD_CALL); 857 858 if (arg->common.aml_opcode == AML_INT_METHODCALL_OP) { 859 860 /* Free method call op and corresponding namestring sub-ob */ 861 862 acpi_ps_free_op(arg->common.value.arg); 863 acpi_ps_free_op(arg); 864 arg = NULL; 865 walk_state->arg_count = 1; 866 } 867 } else { 868 /* Single complex argument, nothing returned */ 869 870 walk_state->arg_count = 1; 871 } 872 break; 873 874 case ARGP_DATAOBJ: 875 case ARGP_TERMARG: 876 877 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, 878 "**** TermArg/DataObj: %s (%2.2X)\n", 879 acpi_ut_get_argument_type_name(arg_type), 880 arg_type)); 881 882 /* Single complex argument, nothing returned */ 883 884 walk_state->arg_count = 1; 885 break; 886 887 case ARGP_DATAOBJLIST: 888 case ARGP_TERMLIST: 889 case ARGP_OBJLIST: 890 891 if (parser_state->aml < parser_state->pkg_end) { 892 893 /* Non-empty list of variable arguments, nothing returned */ 894 895 walk_state->arg_count = ACPI_VAR_ARGS; 896 } 897 break; 898 899 default: 900 901 ACPI_ERROR((AE_INFO, "Invalid ArgType: 0x%X", arg_type)); 902 status = AE_AML_OPERAND_TYPE; 903 break; 904 } 905 906 *return_arg = arg; 907 return_ACPI_STATUS(status); 908 } 909