summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/psloop.c
blob: 68422afc365f2ac48f98c29f540058ca519fc0c5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: psloop - Main AML parse loop
 *
 * Copyright (C) 2000 - 2018, Intel Corp.
 *
 *****************************************************************************/

/*
 * Parse the AML and build an operation tree as most interpreters, (such as
 * Perl) do. Parsing is done by hand rather than with a YACC generated parser
 * to tightly constrain stack and dynamic memory usage. Parsing is kept
 * flexible and the code fairly compact by parsing based on a list of AML
 * opcode templates in aml_op_info[].
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acinterp.h"
#include "acparser.h"
#include "acdispat.h"
#include "amlcode.h"
#include "acconvert.h"

#define _COMPONENT          ACPI_PARSER
ACPI_MODULE_NAME("psloop")

/* Local prototypes */
static acpi_status
acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
		      u8 * aml_op_start, union acpi_parse_object *op);

static void
acpi_ps_link_module_code(union acpi_parse_object *parent_op,
			 u8 *aml_start, u32 aml_length, acpi_owner_id owner_id);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_get_arguments
 *
 * PARAMETERS:  walk_state          - Current state
 *              aml_op_start        - Op start in AML
 *              op                  - Current Op
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get arguments for passed Op.
 *
 ******************************************************************************/

static acpi_status
acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
		      u8 * aml_op_start, union acpi_parse_object *op)
{
	acpi_status status = AE_OK;
	union acpi_parse_object *arg = NULL;
	const struct acpi_opcode_info *op_info;

	ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state);

	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
			  "Get arguments for opcode [%s]\n",
			  op->common.aml_op_name));

	switch (op->common.aml_opcode) {
	case AML_BYTE_OP:	/* AML_BYTEDATA_ARG */
	case AML_WORD_OP:	/* AML_WORDDATA_ARG */
	case AML_DWORD_OP:	/* AML_DWORDATA_ARG */
	case AML_QWORD_OP:	/* AML_QWORDATA_ARG */
	case AML_STRING_OP:	/* AML_ASCIICHARLIST_ARG */

		/* Fill in constant or string argument directly */

		acpi_ps_get_next_simple_arg(&(walk_state->parser_state),
					    GET_CURRENT_ARG_TYPE(walk_state->
								 arg_types),
					    op);
		break;

	case AML_INT_NAMEPATH_OP:	/* AML_NAMESTRING_ARG */

		status = acpi_ps_get_next_namepath(walk_state,
						   &(walk_state->parser_state),
						   op,
						   ACPI_POSSIBLE_METHOD_CALL);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}

		walk_state->arg_types = 0;
		break;

	default:
		/*
		 * Op is not a constant or string, append each argument to the Op
		 */
		while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) &&
		       !walk_state->arg_count) {
			walk_state->aml = walk_state->parser_state.aml;

			switch (op->common.aml_opcode) {
			case AML_METHOD_OP:
			case AML_BUFFER_OP:
			case AML_PACKAGE_OP:
			case AML_VARIABLE_PACKAGE_OP:
			case AML_WHILE_OP:

				break;

			default:

				ASL_CV_CAPTURE_COMMENTS(walk_state);
				break;
			}

			status =
			    acpi_ps_get_next_arg(walk_state,
						 &(walk_state->parser_state),
						 GET_CURRENT_ARG_TYPE
						 (walk_state->arg_types), &arg);
			if (ACPI_FAILURE(status)) {
				return_ACPI_STATUS(status);
			}

			if (arg) {
				acpi_ps_append_arg(op, arg);
			}

			INCREMENT_ARG_LIST(walk_state->arg_types);
		}

		ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
				  "Final argument count: %8.8X pass %u\n",
				  walk_state->arg_count,
				  walk_state->pass_number));

		/*
		 * This case handles the legacy option that groups all module-level
		 * code blocks together and defers execution until all of the tables
		 * are loaded. Execute all of these blocks at this time.
		 * Execute any module-level code that was detected during the table
		 * load phase.
		 *
		 * Note: this option is deprecated and will be eliminated in the
		 * future. Use of this option can cause problems with AML code that
		 * depends upon in-order immediate execution of module-level code.
		 */
		if (acpi_gbl_group_module_level_code &&
		    (walk_state->pass_number <= ACPI_IMODE_LOAD_PASS2) &&
		    ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) {
			/*
			 * We want to skip If/Else/While constructs during Pass1 because we
			 * want to actually conditionally execute the code during Pass2.
			 *
			 * Except for disassembly, where we always want to walk the
			 * If/Else/While packages
			 */
			switch (op->common.aml_opcode) {
			case AML_IF_OP:
			case AML_ELSE_OP:
			case AML_WHILE_OP:
				/*
				 * Currently supported module-level opcodes are:
				 * IF/ELSE/WHILE. These appear to be the most common,
				 * and easiest to support since they open an AML
				 * package.
				 */
				if (walk_state->pass_number ==
				    ACPI_IMODE_LOAD_PASS1) {
					acpi_ps_link_module_code(op->common.
								 parent,
								 aml_op_start,
								 (u32)
								 (walk_state->
								 parser_state.
								 pkg_end -
								 aml_op_start),
								 walk_state->
								 owner_id);
				}

				ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
						  "Pass1: Skipping an If/Else/While body\n"));

				/* Skip body of if/else/while in pass 1 */

				walk_state->parser_state.aml =
				    walk_state->parser_state.pkg_end;
				walk_state->arg_count = 0;
				break;

			default:
				/*
				 * Check for an unsupported executable opcode at module
				 * level. We must be in PASS1, the parent must be a SCOPE,
				 * The opcode class must be EXECUTE, and the opcode must
				 * not be an argument to another opcode.
				 */
				if ((walk_state->pass_number ==
				     ACPI_IMODE_LOAD_PASS1)
				    && (op->common.parent->common.aml_opcode ==
					AML_SCOPE_OP)) {
					op_info =
					    acpi_ps_get_opcode_info(op->common.
								    aml_opcode);
					if ((op_info->class ==
					     AML_CLASS_EXECUTE) && (!arg)) {
						ACPI_WARNING((AE_INFO,
							      "Unsupported module-level executable opcode "
							      "0x%.2X at table offset 0x%.4X",
							      op->common.
							      aml_opcode,
							      (u32)
							      (ACPI_PTR_DIFF
							       (aml_op_start,
								walk_state->
								parser_state.
								aml_start) +
							       sizeof(struct
								      acpi_table_header))));
					}
				}
				break;
			}
		}

		/* Special processing for certain opcodes */

		switch (op->common.aml_opcode) {
		case AML_METHOD_OP:
			/*
			 * Skip parsing of control method because we don't have enough
			 * info in the first pass to parse it correctly.
			 *
			 * Save the length and address of the body
			 */
			op->named.data = walk_state->parser_state.aml;
			op->named.length = (u32)
			    (walk_state->parser_state.pkg_end -
			     walk_state->parser_state.aml);

			/* Skip body of method */

			walk_state->parser_state.aml =
			    walk_state->parser_state.pkg_end;
			walk_state->arg_count = 0;
			break;

		case AML_BUFFER_OP:
		case AML_PACKAGE_OP:
		case AML_VARIABLE_PACKAGE_OP:

			if ((op->common.parent) &&
			    (op->common.parent->common.aml_opcode ==
			     AML_NAME_OP)
			    && (walk_state->pass_number <=
				ACPI_IMODE_LOAD_PASS2)) {
				ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
						  "Setup Package/Buffer: Pass %u, AML Ptr: %p\n",
						  walk_state->pass_number,
						  aml_op_start));

				/*
				 * Skip parsing of Buffers and Packages because we don't have
				 * enough info in the first pass to parse them correctly.
				 */
				op->named.data = aml_op_start;
				op->named.length = (u32)
				    (walk_state->parser_state.pkg_end -
				     aml_op_start);

				/* Skip body */

				walk_state->parser_state.aml =
				    walk_state->parser_state.pkg_end;
				walk_state->arg_count = 0;
			}
			break;

		case AML_WHILE_OP:

			if (walk_state->control_state) {
				walk_state->control_state->control.package_end =
				    walk_state->parser_state.pkg_end;
			}
			break;

		default:

			/* No action for all other opcodes */

			break;
		}

		break;
	}

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_link_module_code
 *
 * PARAMETERS:  parent_op           - Parent parser op
 *              aml_start           - Pointer to the AML
 *              aml_length          - Length of executable AML
 *              owner_id            - owner_id of module level code
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Wrap the module-level code with a method object and link the
 *              object to the global list. Note, the mutex field of the method
 *              object is used to link multiple module-level code objects.
 *
 * NOTE: In this legacy option, each block of detected executable AML
 * code that is outside of any control method is wrapped with a temporary
 * control method object and placed on a global list below.
 *
 * This function executes the module-level code for all tables only after
 * all of the tables have been loaded. It is a legacy option and is
 * not compatible with other ACPI implementations. See acpi_ns_load_table.
 *
 * This function will be removed when the legacy option is removed.
 *
 ******************************************************************************/

static void
acpi_ps_link_module_code(union acpi_parse_object *parent_op,
			 u8 *aml_start, u32 aml_length, acpi_owner_id owner_id)
{
	union acpi_operand_object *prev;
	union acpi_operand_object *next;
	union acpi_operand_object *method_obj;
	struct acpi_namespace_node *parent_node;

	ACPI_FUNCTION_TRACE(ps_link_module_code);

	/* Get the tail of the list */

	prev = next = acpi_gbl_module_code_list;
	while (next) {
		prev = next;
		next = next->method.mutex;
	}

	/*
	 * Insert the module level code into the list. Merge it if it is
	 * adjacent to the previous element.
	 */
	if (!prev ||
	    ((prev->method.aml_start + prev->method.aml_length) != aml_start)) {

		/* Create, initialize, and link a new temporary method object */

		method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
		if (!method_obj) {
			return_VOID;
		}

		ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
				  "Create/Link new code block: %p\n",
				  method_obj));

		if (parent_op->common.node) {
			parent_node = parent_op->common.node;
		} else {
			parent_node = acpi_gbl_root_node;
		}

		method_obj->method.aml_start = aml_start;
		method_obj->method.aml_length = aml_length;
		method_obj->method.owner_id = owner_id;
		method_obj->method.info_flags |= ACPI_METHOD_MODULE_LEVEL;

		/*
		 * Save the parent node in next_object. This is cheating, but we
		 * don't want to expand the method object.
		 */
		method_obj->method.next_object =
		    ACPI_CAST_PTR(union acpi_operand_object, parent_node);

		if (!prev) {
			acpi_gbl_module_code_list = method_obj;
		} else {
			prev->method.mutex = method_obj;
		}
	} else {
		ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
				  "Appending to existing code block: %p\n",
				  prev));

		prev->method.aml_length += aml_length;
	}

	return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_parse_loop
 *
 * PARAMETERS:  walk_state          - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Parse AML (pointed to by the current parser state) and return
 *              a tree of ops.
 *
 ******************************************************************************/

acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state)
{
	acpi_status status = AE_OK;
	union acpi_parse_object *op = NULL;	/* current op */
	struct acpi_parse_state *parser_state;
	u8 *aml_op_start = NULL;

	ACPI_FUNCTION_TRACE_PTR(ps_parse_loop, walk_state);

	if (walk_state->descending_callback == NULL) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	parser_state = &walk_state->parser_state;
	walk_state->arg_types = 0;

#if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))

	if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) {

		/* We are restarting a preempted control method */

		if (acpi_ps_has_completed_scope(parser_state)) {
			/*
			 * We must check if a predicate to an IF or WHILE statement
			 * was just completed
			 */
			if ((parser_state->scope->parse_scope.op) &&
			    ((parser_state->scope->parse_scope.op->common.
			      aml_opcode == AML_IF_OP)
			     || (parser_state->scope->parse_scope.op->common.
				 aml_opcode == AML_WHILE_OP))
			    && (walk_state->control_state)
			    && (walk_state->control_state->common.state ==
				ACPI_CONTROL_PREDICATE_EXECUTING)) {
				/*
				 * A predicate was just completed, get the value of the
				 * predicate and branch based on that value
				 */
				walk_state->op = NULL;
				status =
				    acpi_ds_get_predicate_value(walk_state,
								ACPI_TO_POINTER
								(TRUE));
				if (ACPI_FAILURE(status)
				    && ((status & AE_CODE_MASK) !=
					AE_CODE_CONTROL)) {
					if (status == AE_AML_NO_RETURN_VALUE) {
						ACPI_EXCEPTION((AE_INFO, status,
								"Invoked method did not return a value"));
					}

					ACPI_EXCEPTION((AE_INFO, status,
							"GetPredicate Failed"));
					return_ACPI_STATUS(status);
				}

				status =
				    acpi_ps_next_parse_state(walk_state, op,
							     status);
			}

			acpi_ps_pop_scope(parser_state, &op,
					  &walk_state->arg_types,
					  &walk_state->arg_count);
			ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
					  "Popped scope, Op=%p\n", op));
		} else if (walk_state->prev_op) {

			/* We were in the middle of an op */

			op = walk_state->prev_op;
			walk_state->arg_types = walk_state->prev_arg_types;
		}
	}
#endif

	/* Iterative parsing loop, while there is more AML to process: */

	while ((parser_state->aml < parser_state->aml_end) || (op)) {
		ASL_CV_CAPTURE_COMMENTS(walk_state);

		aml_op_start = parser_state->aml;
		if (!op) {
			status =
			    acpi_ps_create_op(walk_state, aml_op_start, &op);
			if (ACPI_FAILURE(status)) {
				if (status == AE_CTRL_PARSE_CONTINUE) {
					continue;
				}

				if (status == AE_CTRL_PARSE_PENDING) {
					status = AE_OK;
				}

				if (status == AE_CTRL_TERMINATE) {
					return_ACPI_STATUS(status);
				}

				status =
				    acpi_ps_complete_op(walk_state, &op,
							status);
				if (ACPI_FAILURE(status)) {
					return_ACPI_STATUS(status);
				}

				continue;
			}

			acpi_ex_start_trace_opcode(op, walk_state);
		}

		/*
		 * Start arg_count at zero because we don't know if there are
		 * any args yet
		 */
		walk_state->arg_count = 0;

		switch (op->common.aml_opcode) {
		case AML_BYTE_OP:
		case AML_WORD_OP:
		case AML_DWORD_OP:
		case AML_QWORD_OP:

			break;

		default:

			ASL_CV_CAPTURE_COMMENTS(walk_state);
			break;
		}

		/* Are there any arguments that must be processed? */

		if (walk_state->arg_types) {

			/* Get arguments */

			status =
			    acpi_ps_get_arguments(walk_state, aml_op_start, op);
			if (ACPI_FAILURE(status)) {
				status =
				    acpi_ps_complete_op(walk_state, &op,
							status);
				if (ACPI_FAILURE(status)) {
					return_ACPI_STATUS(status);
				}

				continue;
			}
		}

		/* Check for arguments that need to be processed */

		ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
				  "Parseloop: argument count: %8.8X\n",
				  walk_state->arg_count));

		if (walk_state->arg_count) {
			/*
			 * There are arguments (complex ones), push Op and
			 * prepare for argument
			 */
			status = acpi_ps_push_scope(parser_state, op,
						    walk_state->arg_types,
						    walk_state->arg_count);
			if (ACPI_FAILURE(status)) {
				status =
				    acpi_ps_complete_op(walk_state, &op,
							status);
				if (ACPI_FAILURE(status)) {
					return_ACPI_STATUS(status);
				}

				continue;
			}

			op = NULL;
			continue;
		}

		/*
		 * All arguments have been processed -- Op is complete,
		 * prepare for next
		 */
		walk_state->op_info =
		    acpi_ps_get_opcode_info(op->common.aml_opcode);
		if (walk_state->op_info->flags & AML_NAMED) {
			if (op->common.aml_opcode == AML_REGION_OP ||
			    op->common.aml_opcode == AML_DATA_REGION_OP) {
				/*
				 * Skip parsing of control method or opregion body,
				 * because we don't have enough info in the first pass
				 * to parse them correctly.
				 *
				 * Completed parsing an op_region declaration, we now
				 * know the length.
				 */
				op->named.length =
				    (u32) (parser_state->aml - op->named.data);
			}
		}

		if (walk_state->op_info->flags & AML_CREATE) {
			/*
			 * Backup to beginning of create_XXXfield declaration (1 for
			 * Opcode)
			 *
			 * body_length is unknown until we parse the body
			 */
			op->named.length =
			    (u32) (parser_state->aml - op->named.data);
		}

		if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
			/*
			 * Backup to beginning of bank_field declaration
			 *
			 * body_length is unknown until we parse the body
			 */
			op->named.length =
			    (u32) (parser_state->aml - op->named.data);
		}

		/* This op complete, notify the dispatcher */

		if (walk_state->ascending_callback != NULL) {
			walk_state->op = op;
			walk_state->opcode = op->common.aml_opcode;

			status = walk_state->ascending_callback(walk_state);
			status =
			    acpi_ps_next_parse_state(walk_state, op, status);
			if (status == AE_CTRL_PENDING) {
				status = AE_OK;
			}
		}

		status = acpi_ps_complete_op(walk_state, &op, status);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}

	}			/* while parser_state->Aml */

	status = acpi_ps_complete_final_op(walk_state, op, status);
	return_ACPI_STATUS(status);
}