dswexec.c

来自「LINUX 2.6.17.4的源码」· C语言 代码 · 共 756 行 · 第 1/2 页

	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_EXCEPTION((AE_INFO, status,
						"While resolving operands for [%s]",
						acpi_ps_get_opcode_name
						(walk_state->opcode)));
			}
		}

		/* 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);

			/* Make sure to properly pop the result stack */

			if (ACPI_SUCCESS(status)) {
				status = acpi_ds_result_stack_pop(walk_state);
			} else if (status == AE_CTRL_PENDING) {
				status = acpi_ds_result_stack_pop(walk_state);
				if (ACPI_SUCCESS(status)) {
					status = AE_CTRL_PENDING;
				}
			}
			break;

		case AML_TYPE_METHOD_CALL:

			/*
			 * If the method is referenced from within a package
			 * declaration, it is not a invocation of the method, just
			 * a reference to it.
			 */
			if ((op->asl.parent) &&
			    ((op->asl.parent->asl.aml_opcode == AML_PACKAGE_OP)
			     || (op->asl.parent->asl.aml_opcode ==
				 AML_VAR_PACKAGE_OP))) {
				ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
						  "Method Reference in a Package, Op=%p\n",
						  op));
				op->common.node =
				    (struct acpi_namespace_node *)op->asl.value.
				    arg->asl.node->object;
				acpi_ut_add_reference(op->asl.value.arg->asl.
						      node->object);
				return_ACPI_STATUS(AE_OK);
			}

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

			/*
			 * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.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 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 (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_ERROR((AE_INFO,
				    "Undefined opcode type Op=%p", 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_ERROR((AE_INFO,
				    "Unimplemented opcode, class=%X type=%X Opcode=%X Op=%p",
				    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:

	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

	/* Invoke exception handler on error */

	if (ACPI_FAILURE(status)) {
		status = acpi_ds_method_error(status, walk_state);
	}

	/* Always clear the object stack */

	walk_state->num_operands = 0;
	return_ACPI_STATUS(status);
}