1/******************************************************************************
2 *
3 * Module Name: psargs - Parse AML opcode arguments
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2014, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions, and the following disclaimer,
16 *    without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 *    substantially similar to the "NO WARRANTY" disclaimer below
19 *    ("Disclaimer") and any redistribution must be conditioned upon
20 *    including a substantially similar Disclaimer requirement for further
21 *    binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 *    of any contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44#include <acpi/acpi.h>
45#include "accommon.h"
46#include "acparser.h"
47#include "amlcode.h"
48#include "acnamesp.h"
49#include "acdispat.h"
50
51#define _COMPONENT          ACPI_PARSER
52ACPI_MODULE_NAME("psargs")
53
54/* Local prototypes */
55static u32
56acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state);
57
58static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
59						       *parser_state);
60
61/*******************************************************************************
62 *
63 * FUNCTION:    acpi_ps_get_next_package_length
64 *
65 * PARAMETERS:  parser_state        - Current parser state object
66 *
67 * RETURN:      Decoded package length. On completion, the AML pointer points
68 *              past the length byte or bytes.
69 *
70 * DESCRIPTION: Decode and return a package length field.
71 *              Note: Largest package length is 28 bits, from ACPI specification
72 *
73 ******************************************************************************/
74
75static u32
76acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state)
77{
78	u8 *aml = parser_state->aml;
79	u32 package_length = 0;
80	u32 byte_count;
81	u8 byte_zero_mask = 0x3F;	/* Default [0:5] */
82
83	ACPI_FUNCTION_TRACE(ps_get_next_package_length);
84
85	/*
86	 * Byte 0 bits [6:7] contain the number of additional bytes
87	 * used to encode the package length, either 0,1,2, or 3
88	 */
89	byte_count = (aml[0] >> 6);
90	parser_state->aml += ((acpi_size) byte_count + 1);
91
92	/* Get bytes 3, 2, 1 as needed */
93
94	while (byte_count) {
95		/*
96		 * Final bit positions for the package length bytes:
97		 *      Byte3->[20:27]
98		 *      Byte2->[12:19]
99		 *      Byte1->[04:11]
100		 *      Byte0->[00:03]
101		 */
102		package_length |= (aml[byte_count] << ((byte_count << 3) - 4));
103
104		byte_zero_mask = 0x0F;	/* Use bits [0:3] of byte 0 */
105		byte_count--;
106	}
107
108	/* Byte 0 is a special case, either bits [0:3] or [0:5] are used */
109
110	package_length |= (aml[0] & byte_zero_mask);
111	return_UINT32(package_length);
112}
113
114/*******************************************************************************
115 *
116 * FUNCTION:    acpi_ps_get_next_package_end
117 *
118 * PARAMETERS:  parser_state        - Current parser state object
119 *
120 * RETURN:      Pointer to end-of-package +1
121 *
122 * DESCRIPTION: Get next package length and return a pointer past the end of
123 *              the package. Consumes the package length field
124 *
125 ******************************************************************************/
126
127u8 *acpi_ps_get_next_package_end(struct acpi_parse_state *parser_state)
128{
129	u8 *start = parser_state->aml;
130	u32 package_length;
131
132	ACPI_FUNCTION_TRACE(ps_get_next_package_end);
133
134	/* Function below updates parser_state->Aml */
135
136	package_length = acpi_ps_get_next_package_length(parser_state);
137
138	return_PTR(start + package_length);	/* end of package */
139}
140
141/*******************************************************************************
142 *
143 * FUNCTION:    acpi_ps_get_next_namestring
144 *
145 * PARAMETERS:  parser_state        - Current parser state object
146 *
147 * RETURN:      Pointer to the start of the name string (pointer points into
148 *              the AML.
149 *
150 * DESCRIPTION: Get next raw namestring within the AML stream. Handles all name
151 *              prefix characters. Set parser state to point past the string.
152 *              (Name is consumed from the AML.)
153 *
154 ******************************************************************************/
155
156char *acpi_ps_get_next_namestring(struct acpi_parse_state *parser_state)
157{
158	u8 *start = parser_state->aml;
159	u8 *end = parser_state->aml;
160
161	ACPI_FUNCTION_TRACE(ps_get_next_namestring);
162
163	/* Point past any namestring prefix characters (backslash or carat) */
164
165	while (ACPI_IS_ROOT_PREFIX(*end) || ACPI_IS_PARENT_PREFIX(*end)) {
166		end++;
167	}
168
169	/* Decode the path prefix character */
170
171	switch (*end) {
172	case 0:
173
174		/* null_name */
175
176		if (end == start) {
177			start = NULL;
178		}
179		end++;
180		break;
181
182	case AML_DUAL_NAME_PREFIX:
183
184		/* Two name segments */
185
186		end += 1 + (2 * ACPI_NAME_SIZE);
187		break;
188
189	case AML_MULTI_NAME_PREFIX_OP:
190
191		/* Multiple name segments, 4 chars each, count in next byte */
192
193		end += 2 + (*(end + 1) * ACPI_NAME_SIZE);
194		break;
195
196	default:
197
198		/* Single name segment */
199
200		end += ACPI_NAME_SIZE;
201		break;
202	}
203
204	parser_state->aml = end;
205	return_PTR((char *)start);
206}
207
208/*******************************************************************************
209 *
210 * FUNCTION:    acpi_ps_get_next_namepath
211 *
212 * PARAMETERS:  parser_state        - Current parser state object
213 *              arg                 - Where the namepath will be stored
214 *              arg_count           - If the namepath points to a control method
215 *                                    the method's argument is returned here.
216 *              possible_method_call - Whether the namepath can possibly be the
217 *                                    start of a method call
218 *
219 * RETURN:      Status
220 *
221 * DESCRIPTION: Get next name (if method call, return # of required args).
222 *              Names are looked up in the internal namespace to determine
223 *              if the name represents a control method. If a method
224 *              is found, the number of arguments to the method is returned.
225 *              This information is critical for parsing to continue correctly.
226 *
227 ******************************************************************************/
228
229acpi_status
230acpi_ps_get_next_namepath(struct acpi_walk_state *walk_state,
231			  struct acpi_parse_state *parser_state,
232			  union acpi_parse_object *arg, u8 possible_method_call)
233{
234	acpi_status status;
235	char *path;
236	union acpi_parse_object *name_op;
237	union acpi_operand_object *method_desc;
238	struct acpi_namespace_node *node;
239	u8 *start = parser_state->aml;
240
241	ACPI_FUNCTION_TRACE(ps_get_next_namepath);
242
243	path = acpi_ps_get_next_namestring(parser_state);
244	acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
245
246	/* Null path case is allowed, just exit */
247
248	if (!path) {
249		arg->common.value.name = path;
250		return_ACPI_STATUS(AE_OK);
251	}
252
253	/*
254	 * Lookup the name in the internal namespace, starting with the current
255	 * scope. We don't want to add anything new to the namespace here,
256	 * however, so we use MODE_EXECUTE.
257	 * Allow searching of the parent tree, but don't open a new scope -
258	 * we just want to lookup the object (must be mode EXECUTE to perform
259	 * the upsearch)
260	 */
261	status = acpi_ns_lookup(walk_state->scope_info, path,
262				ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
263				ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
264				NULL, &node);
265
266	/*
267	 * If this name is a control method invocation, we must
268	 * setup the method call
269	 */
270	if (ACPI_SUCCESS(status) &&
271	    possible_method_call && (node->type == ACPI_TYPE_METHOD)) {
272		if (walk_state->opcode == AML_UNLOAD_OP) {
273			/*
274			 * acpi_ps_get_next_namestring has increased the AML pointer,
275			 * so we need to restore the saved AML pointer for method call.
276			 */
277			walk_state->parser_state.aml = start;
278			walk_state->arg_count = 1;
279			acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
280			return_ACPI_STATUS(AE_OK);
281		}
282
283		/* This name is actually a control method invocation */
284
285		method_desc = acpi_ns_get_attached_object(node);
286		ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
287				  "Control Method - %p Desc %p Path=%p\n", node,
288				  method_desc, path));
289
290		name_op = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
291		if (!name_op) {
292			return_ACPI_STATUS(AE_NO_MEMORY);
293		}
294
295		/* Change Arg into a METHOD CALL and attach name to it */
296
297		acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
298		name_op->common.value.name = path;
299
300		/* Point METHODCALL/NAME to the METHOD Node */
301
302		name_op->common.node = node;
303		acpi_ps_append_arg(arg, name_op);
304
305		if (!method_desc) {
306			ACPI_ERROR((AE_INFO,
307				    "Control Method %p has no attached object",
308				    node));
309			return_ACPI_STATUS(AE_AML_INTERNAL);
310		}
311
312		ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
313				  "Control Method - %p Args %X\n",
314				  node, method_desc->method.param_count));
315
316		/* Get the number of arguments to expect */
317
318		walk_state->arg_count = method_desc->method.param_count;
319		return_ACPI_STATUS(AE_OK);
320	}
321
322	/*
323	 * Special handling if the name was not found during the lookup -
324	 * some not_found cases are allowed
325	 */
326	if (status == AE_NOT_FOUND) {
327
328		/* 1) not_found is ok during load pass 1/2 (allow forward references) */
329
330		if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) !=
331		    ACPI_PARSE_EXECUTE) {
332			status = AE_OK;
333		}
334
335		/* 2) not_found during a cond_ref_of(x) is ok by definition */
336
337		else if (walk_state->op->common.aml_opcode ==
338			 AML_COND_REF_OF_OP) {
339			status = AE_OK;
340		}
341
342		/*
343		 * 3) not_found while building a Package is ok at this point, we
344		 * may flag as an error later if slack mode is not enabled.
345		 * (Some ASL code depends on allowing this behavior)
346		 */
347		else if ((arg->common.parent) &&
348			 ((arg->common.parent->common.aml_opcode ==
349			   AML_PACKAGE_OP)
350			  || (arg->common.parent->common.aml_opcode ==
351			      AML_VAR_PACKAGE_OP))) {
352			status = AE_OK;
353		}
354	}
355
356	/* Final exception check (may have been changed from code above) */
357
358	if (ACPI_FAILURE(status)) {
359		ACPI_ERROR_NAMESPACE(path, status);
360
361		if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) ==
362		    ACPI_PARSE_EXECUTE) {
363
364			/* Report a control method execution error */
365
366			status = acpi_ds_method_error(status, walk_state);
367		}
368	}
369
370	/* Save the namepath */
371
372	arg->common.value.name = path;
373	return_ACPI_STATUS(status);
374}
375
376/*******************************************************************************
377 *
378 * FUNCTION:    acpi_ps_get_next_simple_arg
379 *
380 * PARAMETERS:  parser_state        - Current parser state object
381 *              arg_type            - The argument type (AML_*_ARG)
382 *              arg                 - Where the argument is returned
383 *
384 * RETURN:      None
385 *
386 * DESCRIPTION: Get the next simple argument (constant, string, or namestring)
387 *
388 ******************************************************************************/
389
390void
391acpi_ps_get_next_simple_arg(struct acpi_parse_state *parser_state,
392			    u32 arg_type, union acpi_parse_object *arg)
393{
394	u32 length;
395	u16 opcode;
396	u8 *aml = parser_state->aml;
397
398	ACPI_FUNCTION_TRACE_U32(ps_get_next_simple_arg, arg_type);
399
400	switch (arg_type) {
401	case ARGP_BYTEDATA:
402
403		/* Get 1 byte from the AML stream */
404
405		opcode = AML_BYTE_OP;
406		arg->common.value.integer = (u64) *aml;
407		length = 1;
408		break;
409
410	case ARGP_WORDDATA:
411
412		/* Get 2 bytes from the AML stream */
413
414		opcode = AML_WORD_OP;
415		ACPI_MOVE_16_TO_64(&arg->common.value.integer, aml);
416		length = 2;
417		break;
418
419	case ARGP_DWORDDATA:
420
421		/* Get 4 bytes from the AML stream */
422
423		opcode = AML_DWORD_OP;
424		ACPI_MOVE_32_TO_64(&arg->common.value.integer, aml);
425		length = 4;
426		break;
427
428	case ARGP_QWORDDATA:
429
430		/* Get 8 bytes from the AML stream */
431
432		opcode = AML_QWORD_OP;
433		ACPI_MOVE_64_TO_64(&arg->common.value.integer, aml);
434		length = 8;
435		break;
436
437	case ARGP_CHARLIST:
438
439		/* Get a pointer to the string, point past the string */
440
441		opcode = AML_STRING_OP;
442		arg->common.value.string = ACPI_CAST_PTR(char, aml);
443
444		/* Find the null terminator */
445
446		length = 0;
447		while (aml[length]) {
448			length++;
449		}
450		length++;
451		break;
452
453	case ARGP_NAME:
454	case ARGP_NAMESTRING:
455
456		acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
457		arg->common.value.name =
458		    acpi_ps_get_next_namestring(parser_state);
459		return_VOID;
460
461	default:
462
463		ACPI_ERROR((AE_INFO, "Invalid ArgType 0x%X", arg_type));
464		return_VOID;
465	}
466
467	acpi_ps_init_op(arg, opcode);
468	parser_state->aml += length;
469	return_VOID;
470}
471
472/*******************************************************************************
473 *
474 * FUNCTION:    acpi_ps_get_next_field
475 *
476 * PARAMETERS:  parser_state        - Current parser state object
477 *
478 * RETURN:      A newly allocated FIELD op
479 *
480 * DESCRIPTION: Get next field (named_field, reserved_field, or access_field)
481 *
482 ******************************************************************************/
483
484static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
485						       *parser_state)
486{
487	u32 aml_offset;
488	union acpi_parse_object *field;
489	union acpi_parse_object *arg = NULL;
490	u16 opcode;
491	u32 name;
492	u8 access_type;
493	u8 access_attribute;
494	u8 access_length;
495	u32 pkg_length;
496	u8 *pkg_end;
497	u32 buffer_length;
498
499	ACPI_FUNCTION_TRACE(ps_get_next_field);
500
501	aml_offset =
502	    (u32)ACPI_PTR_DIFF(parser_state->aml, parser_state->aml_start);
503
504	/* Determine field type */
505
506	switch (ACPI_GET8(parser_state->aml)) {
507	case AML_FIELD_OFFSET_OP:
508
509		opcode = AML_INT_RESERVEDFIELD_OP;
510		parser_state->aml++;
511		break;
512
513	case AML_FIELD_ACCESS_OP:
514
515		opcode = AML_INT_ACCESSFIELD_OP;
516		parser_state->aml++;
517		break;
518
519	case AML_FIELD_CONNECTION_OP:
520
521		opcode = AML_INT_CONNECTION_OP;
522		parser_state->aml++;
523		break;
524
525	case AML_FIELD_EXT_ACCESS_OP:
526
527		opcode = AML_INT_EXTACCESSFIELD_OP;
528		parser_state->aml++;
529		break;
530
531	default:
532
533		opcode = AML_INT_NAMEDFIELD_OP;
534		break;
535	}
536
537	/* Allocate a new field op */
538
539	field = acpi_ps_alloc_op(opcode);
540	if (!field) {
541		return_PTR(NULL);
542	}
543
544	field->common.aml_offset = aml_offset;
545
546	/* Decode the field type */
547
548	switch (opcode) {
549	case AML_INT_NAMEDFIELD_OP:
550
551		/* Get the 4-character name */
552
553		ACPI_MOVE_32_TO_32(&name, parser_state->aml);
554		acpi_ps_set_name(field, name);
555		parser_state->aml += ACPI_NAME_SIZE;
556
557		/* Get the length which is encoded as a package length */
558
559		field->common.value.size =
560		    acpi_ps_get_next_package_length(parser_state);
561		break;
562
563	case AML_INT_RESERVEDFIELD_OP:
564
565		/* Get the length which is encoded as a package length */
566
567		field->common.value.size =
568		    acpi_ps_get_next_package_length(parser_state);
569		break;
570
571	case AML_INT_ACCESSFIELD_OP:
572	case AML_INT_EXTACCESSFIELD_OP:
573
574		/*
575		 * Get access_type and access_attrib and merge into the field Op
576		 * access_type is first operand, access_attribute is second. stuff
577		 * these bytes into the node integer value for convenience.
578		 */
579
580		/* Get the two bytes (Type/Attribute) */
581
582		access_type = ACPI_GET8(parser_state->aml);
583		parser_state->aml++;
584		access_attribute = ACPI_GET8(parser_state->aml);
585		parser_state->aml++;
586
587		field->common.value.integer = (u8)access_type;
588		field->common.value.integer |= (u16)(access_attribute << 8);
589
590		/* This opcode has a third byte, access_length */
591
592		if (opcode == AML_INT_EXTACCESSFIELD_OP) {
593			access_length = ACPI_GET8(parser_state->aml);
594			parser_state->aml++;
595
596			field->common.value.integer |=
597			    (u32)(access_length << 16);
598		}
599		break;
600
601	case AML_INT_CONNECTION_OP:
602
603		/*
604		 * Argument for Connection operator can be either a Buffer
605		 * (resource descriptor), or a name_string.
606		 */
607		if (ACPI_GET8(parser_state->aml) == AML_BUFFER_OP) {
608			parser_state->aml++;
609
610			pkg_end = parser_state->aml;
611			pkg_length =
612			    acpi_ps_get_next_package_length(parser_state);
613			pkg_end += pkg_length;
614
615			if (parser_state->aml < pkg_end) {
616
617				/* Non-empty list */
618
619				arg = acpi_ps_alloc_op(AML_INT_BYTELIST_OP);
620				if (!arg) {
621					acpi_ps_free_op(field);
622					return_PTR(NULL);
623				}
624
625				/* Get the actual buffer length argument */
626
627				opcode = ACPI_GET8(parser_state->aml);
628				parser_state->aml++;
629
630				switch (opcode) {
631				case AML_BYTE_OP:	/* AML_BYTEDATA_ARG */
632
633					buffer_length =
634					    ACPI_GET8(parser_state->aml);
635					parser_state->aml += 1;
636					break;
637
638				case AML_WORD_OP:	/* AML_WORDDATA_ARG */
639
640					buffer_length =
641					    ACPI_GET16(parser_state->aml);
642					parser_state->aml += 2;
643					break;
644
645				case AML_DWORD_OP:	/* AML_DWORDATA_ARG */
646
647					buffer_length =
648					    ACPI_GET32(parser_state->aml);
649					parser_state->aml += 4;
650					break;
651
652				default:
653
654					buffer_length = 0;
655					break;
656				}
657
658				/* Fill in bytelist data */
659
660				arg->named.value.size = buffer_length;
661				arg->named.data = parser_state->aml;
662			}
663
664			/* Skip to End of byte data */
665
666			parser_state->aml = pkg_end;
667		} else {
668			arg = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
669			if (!arg) {
670				acpi_ps_free_op(field);
671				return_PTR(NULL);
672			}
673
674			/* Get the Namestring argument */
675
676			arg->common.value.name =
677			    acpi_ps_get_next_namestring(parser_state);
678		}
679
680		/* Link the buffer/namestring to parent (CONNECTION_OP) */
681
682		acpi_ps_append_arg(field, arg);
683		break;
684
685	default:
686
687		/* Opcode was set in previous switch */
688		break;
689	}
690
691	return_PTR(field);
692}
693
694/*******************************************************************************
695 *
696 * FUNCTION:    acpi_ps_get_next_arg
697 *
698 * PARAMETERS:  walk_state          - Current state
699 *              parser_state        - Current parser state object
700 *              arg_type            - The argument type (AML_*_ARG)
701 *              return_arg          - Where the next arg is returned
702 *
703 * RETURN:      Status, and an op object containing the next argument.
704 *
705 * DESCRIPTION: Get next argument (including complex list arguments that require
706 *              pushing the parser stack)
707 *
708 ******************************************************************************/
709
710acpi_status
711acpi_ps_get_next_arg(struct acpi_walk_state *walk_state,
712		     struct acpi_parse_state *parser_state,
713		     u32 arg_type, union acpi_parse_object **return_arg)
714{
715	union acpi_parse_object *arg = NULL;
716	union acpi_parse_object *prev = NULL;
717	union acpi_parse_object *field;
718	u32 subop;
719	acpi_status status = AE_OK;
720
721	ACPI_FUNCTION_TRACE_PTR(ps_get_next_arg, parser_state);
722
723	switch (arg_type) {
724	case ARGP_BYTEDATA:
725	case ARGP_WORDDATA:
726	case ARGP_DWORDDATA:
727	case ARGP_CHARLIST:
728	case ARGP_NAME:
729	case ARGP_NAMESTRING:
730
731		/* Constants, strings, and namestrings are all the same size */
732
733		arg = acpi_ps_alloc_op(AML_BYTE_OP);
734		if (!arg) {
735			return_ACPI_STATUS(AE_NO_MEMORY);
736		}
737		acpi_ps_get_next_simple_arg(parser_state, arg_type, arg);
738		break;
739
740	case ARGP_PKGLENGTH:
741
742		/* Package length, nothing returned */
743
744		parser_state->pkg_end =
745		    acpi_ps_get_next_package_end(parser_state);
746		break;
747
748	case ARGP_FIELDLIST:
749
750		if (parser_state->aml < parser_state->pkg_end) {
751
752			/* Non-empty list */
753
754			while (parser_state->aml < parser_state->pkg_end) {
755				field = acpi_ps_get_next_field(parser_state);
756				if (!field) {
757					return_ACPI_STATUS(AE_NO_MEMORY);
758				}
759
760				if (prev) {
761					prev->common.next = field;
762				} else {
763					arg = field;
764				}
765				prev = field;
766			}
767
768			/* Skip to End of byte data */
769
770			parser_state->aml = parser_state->pkg_end;
771		}
772		break;
773
774	case ARGP_BYTELIST:
775
776		if (parser_state->aml < parser_state->pkg_end) {
777
778			/* Non-empty list */
779
780			arg = acpi_ps_alloc_op(AML_INT_BYTELIST_OP);
781			if (!arg) {
782				return_ACPI_STATUS(AE_NO_MEMORY);
783			}
784
785			/* Fill in bytelist data */
786
787			arg->common.value.size = (u32)
788			    ACPI_PTR_DIFF(parser_state->pkg_end,
789					  parser_state->aml);
790			arg->named.data = parser_state->aml;
791
792			/* Skip to End of byte data */
793
794			parser_state->aml = parser_state->pkg_end;
795		}
796		break;
797
798	case ARGP_TARGET:
799	case ARGP_SUPERNAME:
800	case ARGP_SIMPLENAME:
801
802		subop = acpi_ps_peek_opcode(parser_state);
803		if (subop == 0 ||
804		    acpi_ps_is_leading_char(subop) ||
805		    ACPI_IS_ROOT_PREFIX(subop) ||
806		    ACPI_IS_PARENT_PREFIX(subop)) {
807
808			/* null_name or name_string */
809
810			arg = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
811			if (!arg) {
812				return_ACPI_STATUS(AE_NO_MEMORY);
813			}
814
815			/* To support super_name arg of Unload */
816
817			if (walk_state->opcode == AML_UNLOAD_OP) {
818				status =
819				    acpi_ps_get_next_namepath(walk_state,
820							      parser_state, arg,
821							      1);
822
823				/*
824				 * If the super_name arg of Unload is a method call,
825				 * we have restored the AML pointer, just free this Arg
826				 */
827				if (arg->common.aml_opcode ==
828				    AML_INT_METHODCALL_OP) {
829					acpi_ps_free_op(arg);
830					arg = NULL;
831				}
832			} else {
833				status =
834				    acpi_ps_get_next_namepath(walk_state,
835							      parser_state, arg,
836							      0);
837			}
838		} else {
839			/* Single complex argument, nothing returned */
840
841			walk_state->arg_count = 1;
842		}
843		break;
844
845	case ARGP_DATAOBJ:
846	case ARGP_TERMARG:
847
848		/* Single complex argument, nothing returned */
849
850		walk_state->arg_count = 1;
851		break;
852
853	case ARGP_DATAOBJLIST:
854	case ARGP_TERMLIST:
855	case ARGP_OBJLIST:
856
857		if (parser_state->aml < parser_state->pkg_end) {
858
859			/* Non-empty list of variable arguments, nothing returned */
860
861			walk_state->arg_count = ACPI_VAR_ARGS;
862		}
863		break;
864
865	default:
866
867		ACPI_ERROR((AE_INFO, "Invalid ArgType: 0x%X", arg_type));
868		status = AE_AML_OPERAND_TYPE;
869		break;
870	}
871
872	*return_arg = arg;
873	return_ACPI_STATUS(status);
874}
875