aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/acpi/parser/psparse.c
blob: 1442e55c40d1cbeebdcd1012b5330693099541be (plain) (blame)
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
661
662
663
664
665
666
/******************************************************************************
 *
 * Module Name: psparse - Parser top level AML parse routines
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2007, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

/*
 * Parse the AML and build an operation tree as most interpreters,
 * like Perl, do.  Parsing is done by hand rather than with a YACC
 * generated parser to tightly constrain stack and dynamic memory
 * usage.  At the same time, 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 <acpi/acparser.h>
#include <acpi/acdispat.h>
#include <acpi/amlcode.h>
#include <acpi/acnamesp.h>
#include <acpi/acinterp.h>

#define _COMPONENT          ACPI_PARSER
ACPI_MODULE_NAME("psparse")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_get_opcode_size
 *
 * PARAMETERS:  Opcode          - An AML opcode
 *
 * RETURN:      Size of the opcode, in bytes (1 or 2)
 *
 * DESCRIPTION: Get the size of the current opcode.
 *
 ******************************************************************************/
u32 acpi_ps_get_opcode_size(u32 opcode)
{

	/* Extended (2-byte) opcode if > 255 */

	if (opcode > 0x00FF) {
		return (2);
	}

	/* Otherwise, just a single byte opcode */

	return (1);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_peek_opcode
 *
 * PARAMETERS:  parser_state        - A parser state object
 *
 * RETURN:      Next AML opcode
 *
 * DESCRIPTION: Get next AML opcode (without incrementing AML pointer)
 *
 ******************************************************************************/

u16 acpi_ps_peek_opcode(struct acpi_parse_state * parser_state)
{
	u8 *aml;
	u16 opcode;

	aml = parser_state->aml;
	opcode = (u16) ACPI_GET8(aml);

	if (opcode == AML_EXTENDED_OP_PREFIX) {

		/* Extended opcode, get the second opcode byte */

		aml++;
		opcode = (u16) ((opcode << 8) | ACPI_GET8(aml));
	}

	return (opcode);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_complete_this_op
 *
 * PARAMETERS:  walk_state      - Current State
 *              Op              - Op to complete
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Perform any cleanup at the completion of an Op.
 *
 ******************************************************************************/

acpi_status
acpi_ps_complete_this_op(struct acpi_walk_state * walk_state,
			 union acpi_parse_object * op)
{
	union acpi_parse_object *prev;
	union acpi_parse_object *next;
	const struct acpi_opcode_info *parent_info;
	union acpi_parse_object *replacement_op = NULL;

	ACPI_FUNCTION_TRACE_PTR(ps_complete_this_op, op);

	/* Check for null Op, can happen if AML code is corrupt */

	if (!op) {
		return_ACPI_STATUS(AE_OK);	/* OK for now */
	}

	/* Delete this op and the subtree below it if asked to */

	if (((walk_state->parse_flags & ACPI_PARSE_TREE_MASK) !=
	     ACPI_PARSE_DELETE_TREE)
	    || (walk_state->op_info->class == AML_CLASS_ARGUMENT)) {
		return_ACPI_STATUS(AE_OK);
	}

	/* Make sure that we only delete this subtree */

	if (op->common.parent) {
		prev = op->common.parent->common.value.arg;
		if (!prev) {

			/* Nothing more to do */

			goto cleanup;
		}

		/*
		 * Check if we need to replace the operator and its subtree
		 * with a return value op (placeholder op)
		 */
		parent_info =
		    acpi_ps_get_opcode_info(op->common.parent->common.
					    aml_opcode);

		switch (parent_info->class) {
		case AML_CLASS_CONTROL:
			break;

		case AML_CLASS_CREATE:

			/*
			 * These opcodes contain term_arg operands. The current
			 * op must be replaced by a placeholder return op
			 */
			replacement_op =
			    acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP);
			if (!replacement_op) {
				goto allocate_error;
			}
			break;

		case AML_CLASS_NAMED_OBJECT:

			/*
			 * These opcodes contain term_arg operands. The current
			 * op must be replaced by a placeholder return op
			 */
			if ((op->common.parent->common.aml_opcode ==
			     AML_REGION_OP)
			    || (op->common.parent->common.aml_opcode ==
				AML_DATA_REGION_OP)
			    || (op->common.parent->common.aml_opcode ==
				AML_BUFFER_OP)
			    || (op->common.parent->common.aml_opcode ==
				AML_PACKAGE_OP)
			    || (op->common.parent->common.aml_opcode ==
				AML_VAR_PACKAGE_OP)) {
				replacement_op =
				    acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP);
				if (!replacement_op) {
					goto allocate_error;
				}
			} else
			    if ((op->common.parent->common.aml_opcode ==
				 AML_NAME_OP)
				&& (walk_state->pass_number <=
				    ACPI_IMODE_LOAD_PASS2)) {
				if ((op->common.aml_opcode == AML_BUFFER_OP)
				    || (op->common.aml_opcode == AML_PACKAGE_OP)
				    || (op->common.aml_opcode ==
					AML_VAR_PACKAGE_OP)) {
					replacement_op =
					    acpi_ps_alloc_op(op->common.
							     aml_opcode);
					if (!replacement_op) {
						goto allocate_error;
					}

					replacement_op->named.data =
					    op->named.data;
					replacement_op->named.length =
					    op->named.length;
				}
			}
			break;

		default:

			replacement_op =
			    acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP);
			if (!replacement_op) {
				goto allocate_error;
			}
		}

		/* We must unlink this op from the parent tree */

		if (prev == op) {

			/* This op is the first in the list */

			if (replacement_op) {
				replacement_op->common.parent =
				    op->common.parent;
				replacement_op->common.value.arg = NULL;
				replacement_op->common.node = op->common.node;
				op->common.parent->common.value.arg =
				    replacement_op;
				replacement_op->common.next = op->common.next;
			} else {
				op->common.parent->common.value.arg =
				    op->common.next;
			}
		}

		/* Search the parent list */

		else
			while (prev) {

				/* Traverse all siblings in the parent's argument list */

				next = prev->common.next;
				if (next == op) {
					if (replacement_op) {
						replacement_op->common.parent =
						    op->common.parent;
						replacement_op->common.value.
						    arg = NULL;
						replacement_op->common.node =
						    op->common.node;
						prev->common.next =
						    replacement_op;
						replacement_op->common.next =
						    op->common.next;
						next = NULL;
					} else {
						prev->common.next =
						    op->common.next;
						next = NULL;
					}
				}
				prev = next;
			}
	}

      cleanup:

	/* Now we can actually delete the subtree rooted at Op */

	acpi_ps_delete_parse_tree(op);
	return_ACPI_STATUS(AE_OK);

      allocate_error:

	/* Always delete the subtree, even on error */

	acpi_ps_delete_parse_tree(op);
	return_ACPI_STATUS(AE_NO_MEMORY);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_next_parse_state
 *
 * PARAMETERS:  walk_state          - Current state
 *              Op                  - Current parse op
 *              callback_status     - Status from previous operation
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Update the parser state based upon the return exception from
 *              the parser callback.
 *
 ******************************************************************************/

acpi_status
acpi_ps_next_parse_state(struct acpi_walk_state *walk_state,
			 union acpi_parse_object *op,
			 acpi_status callback_status)
{
	struct acpi_parse_state *parser_state = &walk_state->parser_state;
	acpi_status status = AE_CTRL_PENDING;

	ACPI_FUNCTION_TRACE_PTR(ps_next_parse_state, op);

	switch (callback_status) {
	case AE_CTRL_TERMINATE:
		/*
		 * A control method was terminated via a RETURN statement.
		 * The walk of this method is complete.
		 */
		parser_state->aml = parser_state->aml_end;
		status = AE_CTRL_TERMINATE;
		break;

	case AE_CTRL_BREAK:

		parser_state->aml = walk_state->aml_last_while;
		walk_state->control_state->common.value = FALSE;
		status = AE_CTRL_BREAK;
		break;

	case AE_CTRL_CONTINUE:

		parser_state->aml = walk_state->aml_last_while;
		status = AE_CTRL_CONTINUE;
		break;

	case AE_CTRL_PENDING:

		parser_state->aml = walk_state->aml_last_while;
		break;

#if 0
	case AE_CTRL_SKIP:

		parser_state->aml = parser_state->scope->parse_scope.pkg_end;
		status = AE_OK;
		break;
#endif

	case AE_CTRL_TRUE:
		/*
		 * Predicate of an IF was true, and we are at the matching ELSE.
		 * Just close out this package
		 */
		parser_state->aml = acpi_ps_get_next_package_end(parser_state);
		status = AE_CTRL_PENDING;
		break;

	case AE_CTRL_FALSE:
		/*
		 * Either an IF/WHILE Predicate was false or we encountered a BREAK
		 * opcode.  In both cases, we do not execute the rest of the
		 * package;  We simply close out the parent (finishing the walk of
		 * this branch of the tree) and continue execution at the parent
		 * level.
		 */
		parser_state->aml = parser_state->scope->parse_scope.pkg_end;

		/* In the case of a BREAK, just force a predicate (if any) to FALSE */

		walk_state->control_state->common.value = FALSE;
		status = AE_CTRL_END;
		break;

	case AE_CTRL_TRANSFER:

		/* A method call (invocation) -- transfer control */

		status = AE_CTRL_TRANSFER;
		walk_state->prev_op = op;
		walk_state->method_call_op = op;
		walk_state->method_call_node =
		    (op->common.value.arg)->common.node;

		/* Will return value (if any) be used by the caller? */

		walk_state->return_used =
		    acpi_ds_is_result_used(op, walk_state);
		break;

	default:

		status = callback_status;
		if ((callback_status & AE_CODE_MASK) == AE_CODE_CONTROL) {
			status = AE_OK;
		}
		break;
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_parse_aml
 *
 * PARAMETERS:  walk_state      - Current state
 *
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Parse raw AML and return a tree of ops
 *
 ******************************************************************************/

acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state)
{
	acpi_status status;
	struct acpi_thread_state *thread;
	struct acpi_thread_state *prev_walk_list = acpi_gbl_current_walk_list;
	struct acpi_walk_state *previous_walk_state;

	ACPI_FUNCTION_TRACE(ps_parse_aml);

	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
			  "Entered with WalkState=%p Aml=%p size=%X\n",
			  walk_state, walk_state->parser_state.aml,
			  walk_state->parser_state.aml_size));

	/* Create and initialize a new thread state */

	thread = acpi_ut_create_thread_state();
	if (!thread) {
		acpi_ds_delete_walk_state(walk_state);
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	walk_state->thread = thread;

	/*
	 * If executing a method, the starting sync_level is this method's
	 * sync_level
	 */
	if (walk_state->method_desc) {
		walk_state->thread->current_sync_level =
		    walk_state->method_desc->method.sync_level;
	}

	acpi_ds_push_walk_state(walk_state, thread);

	/*
	 * This global allows the AML debugger to get a handle to the currently
	 * executing control method.
	 */
	acpi_gbl_current_walk_list = thread;

	/*
	 * Execute the walk loop as long as there is a valid Walk State.  This
	 * handles nested control method invocations without recursion.
	 */
	ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "State=%p\n", walk_state));

	status = AE_OK;
	while (walk_state) {
		if (ACPI_SUCCESS(status)) {
			/*
			 * The parse_loop executes AML until the method terminates
			 * or calls another method.
			 */
			status = acpi_ps_parse_loop(walk_state);
		}

		ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
				  "Completed one call to walk loop, %s State=%p\n",
				  acpi_format_exception(status), walk_state));

		if (status == AE_CTRL_TRANSFER) {
			/*
			 * A method call was detected.
			 * Transfer control to the called control method
			 */
			status =
			    acpi_ds_call_control_method(thread, walk_state,
							NULL);
			if (ACPI_FAILURE(status)) {
				status =
				    acpi_ds_method_error(status, walk_state);
			}

			/*
			 * If the transfer to the new method method call worked, a new walk
			 * state was created -- get it
			 */
			walk_state = acpi_ds_get_current_walk_state(thread);
			continue;
		} else if (status == AE_CTRL_TERMINATE) {
			status = AE_OK;
		} else if ((status != AE_OK) && (walk_state->method_desc)) {

			/* Either the method parse or actual execution failed */

			ACPI_ERROR_METHOD("Method parse/execution failed",
					  walk_state->method_node, NULL,
					  status);

			/* Check for possible multi-thread reentrancy problem */

			if ((status == AE_ALREADY_EXISTS) &&
			    (!walk_state->method_desc->method.mutex)) {
				ACPI_INFO((AE_INFO,
					   "Marking method %4.4s as Serialized because of AE_ALREADY_EXISTS error",
					   walk_state->method_node->name.
					   ascii));

				/*
				 * Method tried to create an object twice. The probable cause is
				 * that the method cannot handle reentrancy.
				 *
				 * The method is marked not_serialized, but it tried to create
				 * a named object, causing the second thread entrance to fail.
				 * Workaround this problem by marking the method permanently
				 * as Serialized.
				 */
				walk_state->method_desc->method.method_flags |=
				    AML_METHOD_SERIALIZED;
				walk_state->method_desc->method.sync_level = 0;
			}
		}

		/* We are done with this walk, move on to the parent if any */

		walk_state = acpi_ds_pop_walk_state(thread);

		/* Reset the current scope to the beginning of scope stack */

		acpi_ds_scope_stack_clear(walk_state);

		/*
		 * If we just returned from the execution of a control method or if we
		 * encountered an error during the method parse phase, there's lots of
		 * cleanup to do
		 */
		if (((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) ==
		     ACPI_PARSE_EXECUTE) || (ACPI_FAILURE(status))) {
			acpi_ds_terminate_control_method(walk_state->
							 method_desc,
							 walk_state);
		}

		/* Delete this walk state and all linked control states */

		acpi_ps_cleanup_scope(&walk_state->parser_state);
		previous_walk_state = walk_state;

		ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
				  "ReturnValue=%p, ImplicitValue=%p State=%p\n",
				  walk_state->return_desc,
				  walk_state->implicit_return_obj, walk_state));

		/* Check if we have restarted a preempted walk */

		walk_state = acpi_ds_get_current_walk_state(thread);
		if (walk_state) {
			if (ACPI_SUCCESS(status)) {
				/*
				 * There is another walk state, restart it.
				 * If the method return value is not used by the parent,
				 * The object is deleted
				 */
				if (!previous_walk_state->return_desc) {
					status =
					    acpi_ds_restart_control_method
					    (walk_state,
					     previous_walk_state->
					     implicit_return_obj);
				} else {
					/*
					 * We have a valid return value, delete any implicit
					 * return value.
					 */
					acpi_ds_clear_implicit_return
					    (previous_walk_state);

					status =
					    acpi_ds_restart_control_method
					    (walk_state,
					     previous_walk_state->return_desc);
				}
				if (ACPI_SUCCESS(status)) {
					walk_state->walk_type |=
					    ACPI_WALK_METHOD_RESTART;
				}
			} else {
				/* On error, delete any return object */

				acpi_ut_remove_reference(previous_walk_state->
							 return_desc);
			}
		}

		/*
		 * Just completed a 1st-level method, save the final internal return
		 * value (if any)
		 */
		else if (previous_walk_state->caller_return_desc) {
			if (previous_walk_state->implicit_return_obj) {
				*(previous_walk_state->caller_return_desc) =
				    previous_walk_state->implicit_return_obj;
			} else {
				/* NULL if no return value */

				*(previous_walk_state->caller_return_desc) =
				    previous_walk_state->return_desc;
			}
		} else {
			if (previous_walk_state->return_desc) {

				/* Caller doesn't want it, must delete it */

				acpi_ut_remove_reference(previous_walk_state->
							 return_desc);
			}
			if (previous_walk_state->implicit_return_obj) {

				/* Caller doesn't want it, must delete it */

				acpi_ut_remove_reference(previous_walk_state->
							 implicit_return_obj);
			}
		}

		acpi_ds_delete_walk_state(previous_walk_state);
	}

	/* Normal exit */

	acpi_ex_release_all_mutexes(thread);
	acpi_ut_delete_generic_state(ACPI_CAST_PTR
				     (union acpi_generic_state, thread));
	acpi_gbl_current_walk_list = prev_walk_list;
	return_ACPI_STATUS(status);
}