1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3 *
4 * Module Name: dswexec - Dispatcher method execution callbacks;
5 * dispatch to interpreter.
6 *
7 * Copyright (C) 2000 - 2019, Intel Corp.
8 *
9 *****************************************************************************/
10
11 #include <acpi/acpi.h>
12 #include "accommon.h"
13 #include "acparser.h"
14 #include "amlcode.h"
15 #include "acdispat.h"
16 #include "acinterp.h"
17 #include "acnamesp.h"
18 #include "acdebug.h"
19 #ifdef ACPI_EXEC_APP
20 #include "aecommon.h"
21 #endif
22
23 #define _COMPONENT ACPI_DISPATCHER
24 ACPI_MODULE_NAME("dswexec")
25
26 /*
27 * Dispatch table for opcode classes
28 */
29 static acpi_execute_op acpi_gbl_op_type_dispatch[] = {
30 acpi_ex_opcode_0A_0T_1R,
31 acpi_ex_opcode_1A_0T_0R,
32 acpi_ex_opcode_1A_0T_1R,
33 acpi_ex_opcode_1A_1T_0R,
34 acpi_ex_opcode_1A_1T_1R,
35 acpi_ex_opcode_2A_0T_0R,
36 acpi_ex_opcode_2A_0T_1R,
37 acpi_ex_opcode_2A_1T_1R,
38 acpi_ex_opcode_2A_2T_1R,
39 acpi_ex_opcode_3A_0T_0R,
40 acpi_ex_opcode_3A_1T_1R,
41 acpi_ex_opcode_6A_0T_1R
42 };
43
44 /*****************************************************************************
45 *
46 * FUNCTION: acpi_ds_get_predicate_value
47 *
48 * PARAMETERS: walk_state - Current state of the parse tree walk
49 * result_obj - if non-zero, pop result from result stack
50 *
51 * RETURN: Status
52 *
53 * DESCRIPTION: Get the result of a predicate evaluation
54 *
55 ****************************************************************************/
56
57 acpi_status
58 acpi_ds_get_predicate_value(struct acpi_walk_state *walk_state,
59 union acpi_operand_object *result_obj)
60 {
61 acpi_status status = AE_OK;
62 union acpi_operand_object *obj_desc;
63 union acpi_operand_object *local_obj_desc = NULL;
64
65 ACPI_FUNCTION_TRACE_PTR(ds_get_predicate_value, walk_state);
66
67 walk_state->control_state->common.state = 0;
68
69 if (result_obj) {
70 status = acpi_ds_result_pop(&obj_desc, walk_state);
71 if (ACPI_FAILURE(status)) {
72 ACPI_EXCEPTION((AE_INFO, status,
73 "Could not get result from predicate evaluation"));
74
75 return_ACPI_STATUS(status);
76 }
77 } else {
78 status = acpi_ds_create_operand(walk_state, walk_state->op, 0);
79 if (ACPI_FAILURE(status)) {
80 return_ACPI_STATUS(status);
81 }
82
83 status =
84 acpi_ex_resolve_to_value(&walk_state->operands[0],
85 walk_state);
86 if (ACPI_FAILURE(status)) {
87 return_ACPI_STATUS(status);
88 }
89
90 obj_desc = walk_state->operands[0];
91 }
92
93 if (!obj_desc) {
94 ACPI_ERROR((AE_INFO,
95 "No predicate ObjDesc=%p State=%p",
96 obj_desc, walk_state));
97
98 return_ACPI_STATUS(AE_AML_NO_OPERAND);
99 }
100
101 /*
102 * Result of predicate evaluation must be an Integer
103 * object. Implicitly convert the argument if necessary.
104 */
105 status = acpi_ex_convert_to_integer(obj_desc, &local_obj_desc,
106 ACPI_IMPLICIT_CONVERSION);
107 if (ACPI_FAILURE(status)) {
108 goto cleanup;
109 }
110
111 if (local_obj_desc->common.type != ACPI_TYPE_INTEGER) {
112 ACPI_ERROR((AE_INFO,
113 "Bad predicate (not an integer) ObjDesc=%p State=%p Type=0x%X",
114 obj_desc, walk_state, obj_desc->common.type));
115
116 status = AE_AML_OPERAND_TYPE;
117 goto cleanup;
118 }
119
120 /* Truncate the predicate to 32-bits if necessary */
121
122 (void)acpi_ex_truncate_for32bit_table(local_obj_desc);
123
124 /*
125 * Save the result of the predicate evaluation on
126 * the control stack
127 */
128 if (local_obj_desc->integer.value) {
129 walk_state->control_state->common.value = TRUE;
130 } else {
131 /*
132 * Predicate is FALSE, we will just toss the
133 * rest of the package
134 */
135 walk_state->control_state->common.value = FALSE;
136 status = AE_CTRL_FALSE;
137 }
138
139 /* Predicate can be used for an implicit return value */
140
141 (void)acpi_ds_do_implicit_return(local_obj_desc, walk_state, TRUE);
142
143 cleanup:
144
145 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
146 "Completed a predicate eval=%X Op=%p\n",
147 walk_state->control_state->common.value,
148 walk_state->op));
149
150 /* Break to debugger to display result */
151
152 acpi_db_display_result_object(local_obj_desc, walk_state);
153
154 /*
155 * Delete the predicate result object (we know that
156 * we don't need it anymore)
157 */
158 if (local_obj_desc != obj_desc) {
159 acpi_ut_remove_reference(local_obj_desc);
160 }
161 acpi_ut_remove_reference(obj_desc);
162
163 walk_state->control_state->common.state = ACPI_CONTROL_NORMAL;
164 return_ACPI_STATUS(status);
165 }
166
167 /*****************************************************************************
168 *
169 * FUNCTION: acpi_ds_exec_begin_op
170 *
171 * PARAMETERS: walk_state - Current state of the parse tree walk
172 * out_op - Where to return op if a new one is created
173 *
174 * RETURN: Status
175 *
176 * DESCRIPTION: Descending callback used during the execution of control
177 * methods. This is where most operators and operands are
178 * dispatched to the interpreter.
179 *
180 ****************************************************************************/
181
182 acpi_status
183 acpi_ds_exec_begin_op(struct acpi_walk_state *walk_state,
184 union acpi_parse_object **out_op)
185 {
186 union acpi_parse_object *op;
187 acpi_status status = AE_OK;
188 u32 opcode_class;
189
190 ACPI_FUNCTION_TRACE_PTR(ds_exec_begin_op, walk_state);
191
192 op = walk_state->op;
193 if (!op) {
194 status = acpi_ds_load2_begin_op(walk_state, out_op);
195 if (ACPI_FAILURE(status)) {
196 goto error_exit;
197 }
198
199 op = *out_op;
200 walk_state->op = op;
201 walk_state->opcode = op->common.aml_opcode;
202 walk_state->op_info =
203 acpi_ps_get_opcode_info(op->common.aml_opcode);
204
205 if (acpi_ns_opens_scope(walk_state->op_info->object_type)) {
206 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
207 "(%s) Popping scope for Op %p\n",
208 acpi_ut_get_type_name(walk_state->
209 op_info->
210 object_type),
211 op));
212
213 status = acpi_ds_scope_stack_pop(walk_state);
214 if (ACPI_FAILURE(status)) {
215 goto error_exit;
216 }
217 }
218 }
219
220 if (op == walk_state->origin) {
221 if (out_op) {
222 *out_op = op;
223 }
224
225 return_ACPI_STATUS(AE_OK);
226 }
227
228 /*
229 * If the previous opcode was a conditional, this opcode
230 * must be the beginning of the associated predicate.
231 * Save this knowledge in the current scope descriptor
232 */
233 if ((walk_state->control_state) &&
234 (walk_state->control_state->common.state ==
235 ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
236 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
237 "Exec predicate Op=%p State=%p\n",
238 op, walk_state));
239
240 walk_state->control_state->common.state =
241 ACPI_CONTROL_PREDICATE_EXECUTING;
242
243 /* Save start of predicate */
244
245 walk_state->control_state->control.predicate_op = op;
246 }
247
248 opcode_class = walk_state->op_info->class;
249
250 /* We want to send namepaths to the load code */
251
252 if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
253 opcode_class = AML_CLASS_NAMED_OBJECT;
254 }
255
256 /*
257 * Handle the opcode based upon the opcode type
258 */
259 switch (opcode_class) {
260 case AML_CLASS_CONTROL:
261
262 status = acpi_ds_exec_begin_control_op(walk_state, op);
263 break;
264
265 case AML_CLASS_NAMED_OBJECT:
266
267 if (walk_state->walk_type & ACPI_WALK_METHOD) {
268 /*
269 * Found a named object declaration during method execution;
270 * we must enter this object into the namespace. The created
271 * object is temporary and will be deleted upon completion of
272 * the execution of this method.
273 *
274 * Note 10/2010: Except for the Scope() op. This opcode does
275 * not actually create a new object, it refers to an existing
276 * object. However, for Scope(), we want to indeed open a
277 * new scope.
278 */
279 if (op->common.aml_opcode != AML_SCOPE_OP) {
280 status =
281 acpi_ds_load2_begin_op(walk_state, NULL);
282 } else {
283 status =
284 acpi_ds_scope_stack_push(op->named.node,
285 op->named.node->
286 type, walk_state);
287 if (ACPI_FAILURE(status)) {
288 return_ACPI_STATUS(status);
289 }
290 }
291 }
292 break;
293
294 case AML_CLASS_EXECUTE:
295 case AML_CLASS_CREATE:
296
297 break;
298
299 default:
300
301 break;
302 }
303
304 /* Nothing to do here during method execution */
305
306 return_ACPI_STATUS(status);
307
308 error_exit:
309 status = acpi_ds_method_error(status, walk_state);
310 return_ACPI_STATUS(status);
311 }
312
313 /*****************************************************************************
314 *
315 * FUNCTION: acpi_ds_exec_end_op
316 *
317 * PARAMETERS: walk_state - Current state of the parse tree walk
318 *
319 * RETURN: Status
320 *
321 * DESCRIPTION: Ascending callback used during the execution of control
322 * methods. The only thing we really need to do here is to
323 * notice the beginning of IF, ELSE, and WHILE blocks.
324 *
325 ****************************************************************************/
326
327 acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
328 {
329 union acpi_parse_object *op;
330 acpi_status status = AE_OK;
331 u32 op_type;
332 u32 op_class;
333 union acpi_parse_object *next_op;
334 union acpi_parse_object *first_arg;
335 #ifdef ACPI_EXEC_APP
336 char *namepath;
337 union acpi_operand_object *obj_desc;
338 #endif
339
340 ACPI_FUNCTION_TRACE_PTR(ds_exec_end_op, walk_state);
341
342 op = walk_state->op;
343 op_type = walk_state->op_info->type;
344 op_class = walk_state->op_info->class;
345
346 if (op_class == AML_CLASS_UNKNOWN) {
347 ACPI_ERROR((AE_INFO, "Unknown opcode 0x%X",
348 op->common.aml_opcode));
349 return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
350 }
351
352 first_arg = op->common.value.arg;
353
354 /* Init the walk state */
355
356 walk_state->num_operands = 0;
357 walk_state->operand_index = 0;
358 walk_state->return_desc = NULL;
359 walk_state->result_obj = NULL;
360
361 /* Call debugger for single step support (DEBUG build only) */
362
363 status = acpi_db_single_step(walk_state, op, op_class);
364 if (ACPI_FAILURE(status)) {
365 return_ACPI_STATUS(status);
366 }
367
368 /* Decode the Opcode Class */
369
370 switch (op_class) {
371 case AML_CLASS_ARGUMENT: /* Constants, literals, etc. */
372
373 if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
374 status = acpi_ds_evaluate_name_path(walk_state);
375 if (ACPI_FAILURE(status)) {
376 goto cleanup;
377 }
378 }
379 break;
380
381 case AML_CLASS_EXECUTE: /* Most operators with arguments */
382
383 /* Build resolved operand stack */
384
385 status = acpi_ds_create_operands(walk_state, first_arg);
386 if (ACPI_FAILURE(status)) {
387 goto cleanup;
388 }
389
390 /*
391 * All opcodes require operand resolution, with the only exceptions
392 * being the object_type and size_of operators.
393 */
394 if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {
395
396 /* Resolve all operands */
397
398 status = acpi_ex_resolve_operands(walk_state->opcode,
399 &(walk_state->
400 operands
401 [walk_state->
402 num_operands - 1]),
403 walk_state);
404 }
405
406 if (ACPI_SUCCESS(status)) {
407 /*
408 * Dispatch the request to the appropriate interpreter handler
409 * routine. There is one routine per opcode "type" based upon the
410 * number of opcode arguments and return type.
411 */
412 status =
413 acpi_gbl_op_type_dispatch[op_type] (walk_state);
414 } else {
415 /*
416 * Treat constructs of the form "Store(LocalX,LocalX)" as noops when the
417 * Local is uninitialized.
418 */
419 if ((status == AE_AML_UNINITIALIZED_LOCAL) &&
420 (walk_state->opcode == AML_STORE_OP) &&
421 (walk_state->operands[0]->common.type ==
422 ACPI_TYPE_LOCAL_REFERENCE)
423 && (walk_state->operands[1]->common.type ==
424 ACPI_TYPE_LOCAL_REFERENCE)
425 && (walk_state->operands[0]->reference.class ==
426 walk_state->operands[1]->reference.class)
427 && (walk_state->operands[0]->reference.value ==
428 walk_state->operands[1]->reference.value)) {
429 status = AE_OK;
430 } else {
431 ACPI_EXCEPTION((AE_INFO, status,
432 "While resolving operands for [%s]",
433 acpi_ps_get_opcode_name
434 (walk_state->opcode)));
435 }
436 }
437
438 /* Always delete the argument objects and clear the operand stack */
439
440 acpi_ds_clear_operands(walk_state);
441
442 /*
443 * If a result object was returned from above, push it on the
444 * current result stack
445 */
446 if (ACPI_SUCCESS(status) && walk_state->result_obj) {
447 status =
448 acpi_ds_result_push(walk_state->result_obj,
449 walk_state);
450 }
451 break;
452
453 default:
454
455 switch (op_type) {
456 case AML_TYPE_CONTROL: /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
457
458 /* 1 Operand, 0 external_result, 0 internal_result */
459
460 status = acpi_ds_exec_end_control_op(walk_state, op);
461
462 break;
463
464 case AML_TYPE_METHOD_CALL:
465 /*
466 * If the method is referenced from within a package
467 * declaration, it is not a invocation of the method, just
468 * a reference to it.
469 */
470 if ((op->asl.parent) &&
471 ((op->asl.parent->asl.aml_opcode == AML_PACKAGE_OP)
472 || (op->asl.parent->asl.aml_opcode ==
473 AML_VARIABLE_PACKAGE_OP))) {
474 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
475 "Method Reference in a Package, Op=%p\n",
476 op));
477
478 op->common.node = (struct acpi_namespace_node *)
479 op->asl.value.arg->asl.node;
480 acpi_ut_add_reference(op->asl.value.arg->asl.
481 node->object);
482 return_ACPI_STATUS(AE_OK);
483 }
484
485 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
486 "Method invocation, Op=%p\n", op));
487
488 /*
489 * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains
490 * the method Node pointer
491 */
492 /* next_op points to the op that holds the method name */
493
494 next_op = first_arg;
495
496 /* next_op points to first argument op */
497
498 next_op = next_op->common.next;
499
500 /*
501 * Get the method's arguments and put them on the operand stack
502 */
503 status = acpi_ds_create_operands(walk_state, next_op);
504 if (ACPI_FAILURE(status)) {
505 break;
506 }
507
508 /*
509 * Since the operands will be passed to another control method,
510 * we must resolve all local references here (Local variables,
511 * arguments to *this* method, etc.)
512 */
513 status = acpi_ds_resolve_operands(walk_state);
514 if (ACPI_FAILURE(status)) {
515
516 /* On error, clear all resolved operands */
517
518 acpi_ds_clear_operands(walk_state);
519 break;
520 }
521
522 /*
523 * Tell the walk loop to preempt this running method and
524 * execute the new method
525 */
526 status = AE_CTRL_TRANSFER;
527
528 /*
529 * Return now; we don't want to disturb anything,
530 * especially the operand count!
531 */
532 return_ACPI_STATUS(status);
533
534 case AML_TYPE_CREATE_FIELD:
535
536 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
537 "Executing CreateField Buffer/Index Op=%p\n",
538 op));
539
540 status = acpi_ds_load2_end_op(walk_state);
541 if (ACPI_FAILURE(status)) {
542 break;
543 }
544
545 status =
546 acpi_ds_eval_buffer_field_operands(walk_state, op);
547 if (ACPI_FAILURE(status)) {
548 break;
549 }
550 #ifdef ACPI_EXEC_APP
551 /*
552 * acpi_exec support for namespace initialization file (initialize
553 * buffer_fields in this code.)
554 */
555 namepath =
556 acpi_ns_get_external_pathname(op->common.node);
557 status = ae_lookup_init_file_entry(namepath, &obj_desc);
558 if (ACPI_SUCCESS(status)) {
559 status =
560 acpi_ex_write_data_to_field(obj_desc,
561 op->common.
562 node->object,
563 NULL);
564 if ACPI_FAILURE
565 (status) {
566 ACPI_EXCEPTION((AE_INFO, status,
567 "While writing to buffer field"));
568 }
569 }
570 ACPI_FREE(namepath);
571 status = AE_OK;
572 #endif
573 break;
574
575 case AML_TYPE_CREATE_OBJECT:
576
577 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
578 "Executing CreateObject (Buffer/Package) Op=%p Child=%p ParentOpcode=%4.4X\n",
579 op, op->named.value.arg,
580 op->common.parent->common.
581 aml_opcode));
582
583 switch (op->common.parent->common.aml_opcode) {
584 case AML_NAME_OP:
585 /*
586 * Put the Node on the object stack (Contains the ACPI Name
587 * of this object)
588 */
589 walk_state->operands[0] = (void *)
590 op->common.parent->common.node;
591 walk_state->num_operands = 1;
592
593 status = acpi_ds_create_node(walk_state,
594 op->common.parent->
595 common.node,
596 op->common.parent);
597 if (ACPI_FAILURE(status)) {
598 break;
599 }
600
601 /* Fall through */
602 /*lint -fallthrough */
603
604 case AML_INT_EVAL_SUBTREE_OP:
605
606 status =
607 acpi_ds_eval_data_object_operands
608 (walk_state, op,
609 acpi_ns_get_attached_object(op->common.
610 parent->common.
611 node));
612 break;
613
614 default:
615
616 status =
617 acpi_ds_eval_data_object_operands
618 (walk_state, op, NULL);
619 break;
620 }
621
622 /*
623 * If a result object was returned from above, push it on the
624 * current result stack
625 */
626 if (walk_state->result_obj) {
627 status =
628 acpi_ds_result_push(walk_state->result_obj,
629 walk_state);
630 }
631 break;
632
633 case AML_TYPE_NAMED_FIELD:
634 case AML_TYPE_NAMED_COMPLEX:
635 case AML_TYPE_NAMED_SIMPLE:
636 case AML_TYPE_NAMED_NO_OBJ:
637
638 status = acpi_ds_load2_end_op(walk_state);
639 if (ACPI_FAILURE(status)) {
640 break;
641 }
642
643 if (op->common.aml_opcode == AML_REGION_OP) {
644 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
645 "Executing OpRegion Address/Length Op=%p\n",
646 op));
647
648 status =
649 acpi_ds_eval_region_operands(walk_state,
650 op);
651 if (ACPI_FAILURE(status)) {
652 break;
653 }
654 } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
655 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
656 "Executing DataTableRegion Strings Op=%p\n",
657 op));
658
659 status =
660 acpi_ds_eval_table_region_operands
661 (walk_state, op);
662 if (ACPI_FAILURE(status)) {
663 break;
664 }
665 } else if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
666 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
667 "Executing BankField Op=%p\n",
668 op));
669
670 status =
671 acpi_ds_eval_bank_field_operands(walk_state,
672 op);
673 if (ACPI_FAILURE(status)) {
674 break;
675 }
676 }
677 break;
678
679 case AML_TYPE_UNDEFINED:
680
681 ACPI_ERROR((AE_INFO,
682 "Undefined opcode type Op=%p", op));
683 return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
684
685 case AML_TYPE_BOGUS:
686
687 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
688 "Internal opcode=%X type Op=%p\n",
689 walk_state->opcode, op));
690 break;
691
692 default:
693
694 ACPI_ERROR((AE_INFO,
695 "Unimplemented opcode, class=0x%X "
696 "type=0x%X Opcode=0x%X Op=%p",
697 op_class, op_type, op->common.aml_opcode,
698 op));
699
700 status = AE_NOT_IMPLEMENTED;
701 break;
702 }
703 }
704
705 /*
706 * ACPI 2.0 support for 64-bit integers: Truncate numeric
707 * result value if we are executing from a 32-bit ACPI table
708 */
709 (void)acpi_ex_truncate_for32bit_table(walk_state->result_obj);
710
711 /*
712 * Check if we just completed the evaluation of a
713 * conditional predicate
714 */
715 if ((ACPI_SUCCESS(status)) &&
716 (walk_state->control_state) &&
717 (walk_state->control_state->common.state ==
718 ACPI_CONTROL_PREDICATE_EXECUTING) &&
719 (walk_state->control_state->control.predicate_op == op)) {
720 status =
721 acpi_ds_get_predicate_value(walk_state,
722 walk_state->result_obj);
723 walk_state->result_obj = NULL;
724 }
725
726 cleanup:
727
728 if (walk_state->result_obj) {
729
730 /* Break to debugger to display result */
731
732 acpi_db_display_result_object(walk_state->result_obj,
733 walk_state);
734
735 /*
736 * Delete the result op if and only if:
737 * Parent will not use the result -- such as any
738 * non-nested type2 op in a method (parent will be method)
739 */
740 acpi_ds_delete_result_if_not_used(op, walk_state->result_obj,
741 walk_state);
742 }
743 #ifdef _UNDER_DEVELOPMENT
744
745 if (walk_state->parser_state.aml == walk_state->parser_state.aml_end) {
746 acpi_db_method_end(walk_state);
747 }
748 #endif
749
750 /* Invoke exception handler on error */
751
752 if (ACPI_FAILURE(status)) {
753 status = acpi_ds_method_error(status, walk_state);
754 }
755
756 /* Always clear the object stack */
757
758 walk_state->num_operands = 0;
759 return_ACPI_STATUS(status);
760 }