dswexec.c

h内核

		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown opcode %X\n", op->common.aml_opcode));
		return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
	}

	first_arg = op->common.value.arg;

	/* Init the walk state */

	walk_state->num_operands = 0;
	walk_state->return_desc = NULL;
	walk_state->result_obj = NULL;

	/* Call debugger for single step support (DEBUG build only) */

	ACPI_DEBUGGER_EXEC (status = acpi_db_single_step (walk_state, op, op_class));
	ACPI_DEBUGGER_EXEC (if (ACPI_FAILURE (status)) {return_ACPI_STATUS (status);});

	/* Decode the Opcode Class */

	switch (op_class) {
	case AML_CLASS_ARGUMENT:    /* constants, literals, etc. -- do nothing */
		break;


	case AML_CLASS_EXECUTE:     /* most operators with arguments */

		/* Build resolved operand stack */

		status = acpi_ds_create_operands (walk_state, first_arg);
		if (ACPI_FAILURE (status)) {
			goto cleanup;
		}

		/* Done with this result state (Now that operand stack is built) */

		status = acpi_ds_result_stack_pop (walk_state);
		if (ACPI_FAILURE (status)) {
			goto cleanup;
		}

		/*
		 * All opcodes require operand resolution, with the only exceptions
		 * being the object_type and size_of operators.
		 */
		if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {
			/* Resolve all operands */

			status = acpi_ex_resolve_operands (walk_state->opcode,
					  &(walk_state->operands [walk_state->num_operands -1]),
					  walk_state);
			if (ACPI_SUCCESS (status)) {
				ACPI_DUMP_OPERANDS (ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
						  acpi_ps_get_opcode_name (walk_state->opcode),
						  walk_state->num_operands, "after ex_resolve_operands");
			}
		}

		if (ACPI_SUCCESS (status)) {
			/*
			 * Dispatch the request to the appropriate interpreter handler
			 * routine.  There is one routine per opcode "type" based upon the
			 * number of opcode arguments and return type.
			 */
			status = acpi_gbl_op_type_dispatch[op_type] (walk_state);
		}
		else {
			/*
			 * Treat constructs of the form "Store(local_x,local_x)" as noops when the
			 * Local is uninitialized.
			 */
			if  ((status == AE_AML_UNINITIALIZED_LOCAL) &&
				(walk_state->opcode == AML_STORE_OP) &&
				(walk_state->operands[0]->common.type == ACPI_TYPE_LOCAL_REFERENCE) &&
				(walk_state->operands[1]->common.type == ACPI_TYPE_LOCAL_REFERENCE) &&
				(walk_state->operands[0]->reference.opcode ==
				 walk_state->operands[1]->reference.opcode) &&
				(walk_state->operands[0]->reference.offset ==
				 walk_state->operands[1]->reference.offset)) {
				status = AE_OK;
			}
			else {
				ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
					"[%s]: Could not resolve operands, %s\n",
					acpi_ps_get_opcode_name (walk_state->opcode),
					acpi_format_exception (status)));
			}
		}

		/* Always delete the argument objects and clear the operand stack */

		acpi_ds_clear_operands (walk_state);

		/*
		 * If a result object was returned from above, push it on the
		 * current result stack
		 */
		if (ACPI_SUCCESS (status) &&
			walk_state->result_obj) {
			status = acpi_ds_result_push (walk_state->result_obj, walk_state);
		}

		break;


	default:

		switch (op_type) {
		case AML_TYPE_CONTROL:    /* Type 1 opcode, IF/ELSE/WHILE/NOOP */

			/* 1 Operand, 0 external_result, 0 internal_result */

			status = acpi_ds_exec_end_control_op (walk_state, op);
			if (ACPI_FAILURE (status)) {
				break;
			}

			status = acpi_ds_result_stack_pop (walk_state);
			break;


		case AML_TYPE_METHOD_CALL:

			ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Method invocation, Op=%p\n", op));

			/*
			 * (AML_METHODCALL) Op->Value->Arg->Node contains
			 * the method Node pointer
			 */
			/* next_op points to the op that holds the method name */

			next_op = first_arg;

			/* next_op points to first argument op */

			next_op = next_op->common.next;

			/*
			 * Get the method's arguments and put them on the operand stack
			 */
			status = acpi_ds_create_operands (walk_state, next_op);
			if (ACPI_FAILURE (status)) {
				break;
			}

			/*
			 * Since the operands will be passed to another control method,
			 * we must resolve all local references here (Local variables,
			 * arguments to *this* method, etc.)
			 */
			status = acpi_ds_resolve_operands (walk_state);
			if (ACPI_FAILURE (status)) {
				/* On error, clear all resolved operands */

				acpi_ds_clear_operands (walk_state);
				break;
			}

			/*
			 * Tell the walk loop to preempt this running method and
			 * execute the new method
			 */
			status = AE_CTRL_TRANSFER;

			/*
			 * Return now; we don't want to disturb anything,
			 * especially the operand count!
			 */
			return_ACPI_STATUS (status);


		case AML_TYPE_CREATE_FIELD:

			ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
				"Executing create_field Buffer/Index Op=%p\n", op));

			status = acpi_ds_load2_end_op (walk_state);
			if (ACPI_FAILURE (status)) {
				break;
			}

			status = acpi_ds_eval_buffer_field_operands (walk_state, op);
			break;


		case AML_TYPE_CREATE_OBJECT:

			ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
				"Executing create_object (Buffer/Package) Op=%p\n", op));

			switch (op->common.parent->common.aml_opcode) {
			case AML_NAME_OP:

				/*
				 * Put the Node on the object stack (Contains the ACPI Name of
				 * this object)
				 */
				walk_state->operands[0] = (void *) op->common.parent->common.node;
				walk_state->num_operands = 1;

				status = acpi_ds_create_node (walk_state, op->common.parent->common.node, op->common.parent);
				if (ACPI_FAILURE (status)) {
					break;
				}

				/* Fall through */
				/*lint -fallthrough */

			case AML_INT_EVAL_SUBTREE_OP:

				status = acpi_ds_eval_data_object_operands (walk_state, op,
						  acpi_ns_get_attached_object (op->common.parent->common.node));
				break;

			default:

				status = acpi_ds_eval_data_object_operands (walk_state, op, NULL);
				break;
			}

			/* Done with this result state (Now that operand stack is built) */

			status = acpi_ds_result_stack_pop (walk_state);
			if (ACPI_FAILURE (status)) {
				goto cleanup;
			}

			/*
			 * If a result object was returned from above, push it on the
			 * current result stack
			 */
			if (ACPI_SUCCESS (status) &&
				walk_state->result_obj) {
				status = acpi_ds_result_push (walk_state->result_obj, walk_state);
			}
			break;


		case AML_TYPE_NAMED_FIELD:
		case AML_TYPE_NAMED_COMPLEX:
		case AML_TYPE_NAMED_SIMPLE:
		case AML_TYPE_NAMED_NO_OBJ:

			status = acpi_ds_load2_end_op (walk_state);
			if (ACPI_FAILURE (status)) {
				break;
			}

			if (op->common.aml_opcode == AML_REGION_OP) {
				ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
					"Executing op_region Address/Length Op=%p\n", op));

				status = acpi_ds_eval_region_operands (walk_state, op);
				if (ACPI_FAILURE (status)) {
					break;
				}

				status = acpi_ds_result_stack_pop (walk_state);
			}

			break;


		case AML_TYPE_UNDEFINED:

			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Undefined opcode type Op=%p\n", op));
			return_ACPI_STATUS (AE_NOT_IMPLEMENTED);


		case AML_TYPE_BOGUS:

			ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
				"Internal opcode=%X type Op=%p\n",
				walk_state->opcode, op));
			break;


		default:

			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
				"Unimplemented opcode, class=%X type=%X Opcode=%X Op=%p\n",
				op_class, op_type, op->common.aml_opcode, op));

			status = AE_NOT_IMPLEMENTED;
			break;
		}
	}

	/*
	 * ACPI 2.0 support for 64-bit integers: Truncate numeric
	 * result value if we are executing from a 32-bit ACPI table
	 */
	acpi_ex_truncate_for32bit_table (walk_state->result_obj);

	/*
	 * Check if we just completed the evaluation of a
	 * conditional predicate
	 */

	if ((ACPI_SUCCESS (status)) &&
		(walk_state->control_state) &&
		(walk_state->control_state->common.state ==
			ACPI_CONTROL_PREDICATE_EXECUTING) &&
		(walk_state->control_state->control.predicate_op == op)) {
		status = acpi_ds_get_predicate_value (walk_state, walk_state->result_obj);
		walk_state->result_obj = NULL;
	}


cleanup:

	/* Invoke exception handler on error */

	if (ACPI_FAILURE (status) &&
		acpi_gbl_exception_handler &&
		!(status & AE_CODE_CONTROL)) {
		acpi_ex_exit_interpreter ();
		status = acpi_gbl_exception_handler (status,
				 walk_state->method_node->name.integer, walk_state->opcode,
				 walk_state->aml_offset, NULL);
		acpi_ex_enter_interpreter ();
	}

	if (walk_state->result_obj) {
		/* Break to debugger to display result */

		ACPI_DEBUGGER_EXEC (acpi_db_display_result_object (walk_state->result_obj, walk_state));

		/*
		 * Delete the result op if and only if:
		 * Parent will not use the result -- such as any
		 * non-nested type2 op in a method (parent will be method)
		 */
		acpi_ds_delete_result_if_not_used (op, walk_state->result_obj, walk_state);
	}

#ifdef _UNDER_DEVELOPMENT

	if (walk_state->parser_state.aml == walk_state->parser_state.aml_end) {
		acpi_db_method_end (walk_state);
	}
#endif

	/* Always clear the object stack */

	walk_state->num_operands = 0;

#ifdef ACPI_DISASSEMBLER

	/* On error, display method locals/args */

	if (ACPI_FAILURE (status)) {
		acpi_dm_dump_method_info (status, walk_state, op);
	}
#endif

	return_ACPI_STATUS (status);
}