exresop.c

h内核

/******************************************************************************
 *
 * Module Name: exresop - AML Interpreter operand/object resolution
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2005, 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.
 */


#include <acpi/acpi.h>
#include <acpi/amlcode.h>
#include <acpi/acparser.h>
#include <acpi/acinterp.h>


#define _COMPONENT          ACPI_EXECUTER
	 ACPI_MODULE_NAME    ("exresop")


/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_check_object_type
 *
 * PARAMETERS:  type_needed         Object type needed
 *              this_type           Actual object type
 *              Object              Object pointer
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Check required type against actual type
 *
 ******************************************************************************/

acpi_status
acpi_ex_check_object_type (
	acpi_object_type                type_needed,
	acpi_object_type                this_type,
	void                            *object)
{
	ACPI_FUNCTION_NAME ("ex_check_object_type");


	if (type_needed == ACPI_TYPE_ANY) {
		/* All types OK, so we don't perform any typechecks */

		return (AE_OK);
	}

	if (type_needed == ACPI_TYPE_LOCAL_REFERENCE) {
		/*
		 * Allow the AML "Constant" opcodes (Zero, One, etc.) to be reference
		 * objects and thus allow them to be targets.  (As per the ACPI
		 * specification, a store to a constant is a noop.)
		 */
		if ((this_type == ACPI_TYPE_INTEGER) &&
			(((union acpi_operand_object *) object)->common.flags & AOPOBJ_AML_CONSTANT)) {
			return (AE_OK);
		}
	}

	if (type_needed != this_type) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
			"Needed [%s], found [%s] %p\n",
			acpi_ut_get_type_name (type_needed),
			acpi_ut_get_type_name (this_type), object));

		return (AE_AML_OPERAND_TYPE);
	}

	return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_resolve_operands
 *
 * PARAMETERS:  Opcode              - Opcode being interpreted
 *              stack_ptr           - Pointer to the operand stack to be
 *                                    resolved
 *              walk_state          - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Convert multiple input operands to the types required by the
 *              target operator.
 *
 *      Each 5-bit group in arg_types represents one required
 *      operand and indicates the required Type. The corresponding operand
 *      will be converted to the required type if possible, otherwise we
 *      abort with an exception.
 *
 ******************************************************************************/

acpi_status
acpi_ex_resolve_operands (
	u16                             opcode,
	union acpi_operand_object       **stack_ptr,
	struct acpi_walk_state          *walk_state)
{
	union acpi_operand_object       *obj_desc;
	acpi_status                     status = AE_OK;
	u8                              object_type;
	void                            *temp_node;
	u32                             arg_types;
	const struct acpi_opcode_info   *op_info;
	u32                             this_arg_type;
	acpi_object_type                type_needed;


	ACPI_FUNCTION_TRACE_U32 ("ex_resolve_operands", opcode);


	op_info = acpi_ps_get_opcode_info (opcode);
	if (op_info->class == AML_CLASS_UNKNOWN) {
		return_ACPI_STATUS (AE_AML_BAD_OPCODE);
	}

	arg_types = op_info->runtime_args;
	if (arg_types == ARGI_INVALID_OPCODE) {
		ACPI_REPORT_ERROR (("resolve_operands: %X is not a valid AML opcode\n",
			opcode));

		return_ACPI_STATUS (AE_AML_INTERNAL);
	}

	ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Opcode %X [%s] required_operand_types=%8.8X \n",
		opcode, op_info->name, arg_types));

	/*
	 * Normal exit is with (arg_types == 0) at end of argument list.
	 * Function will return an exception from within the loop upon
	 * finding an entry which is not (or cannot be converted
	 * to) the required type; if stack underflows; or upon
	 * finding a NULL stack entry (which should not happen).
	 */
	while (GET_CURRENT_ARG_TYPE (arg_types)) {
		if (!stack_ptr || !*stack_ptr) {
			ACPI_REPORT_ERROR (("resolve_operands: Null stack entry at %p\n",
				stack_ptr));

			return_ACPI_STATUS (AE_AML_INTERNAL);
		}

		/* Extract useful items */

		obj_desc = *stack_ptr;

		/* Decode the descriptor type */

		switch (ACPI_GET_DESCRIPTOR_TYPE (obj_desc)) {
		case ACPI_DESC_TYPE_NAMED:

			/* Node */

			object_type = ((struct acpi_namespace_node *) obj_desc)->type;
			break;


		case ACPI_DESC_TYPE_OPERAND:

			/* ACPI internal object */

			object_type = ACPI_GET_OBJECT_TYPE (obj_desc);

			/* Check for bad acpi_object_type */

			if (!acpi_ut_valid_object_type (object_type)) {
				ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Bad operand object type [%X]\n",
					object_type));

				return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
			}

			if (object_type == (u8) ACPI_TYPE_LOCAL_REFERENCE) {
				/*
				 * Decode the Reference
				 */
				op_info = acpi_ps_get_opcode_info (opcode);
				if (op_info->class == AML_CLASS_UNKNOWN) {
					return_ACPI_STATUS (AE_AML_BAD_OPCODE);
				}

				switch (obj_desc->reference.opcode) {
				case AML_DEBUG_OP:
				case AML_NAME_OP:
				case AML_INDEX_OP:
				case AML_REF_OF_OP:
				case AML_ARG_OP:
				case AML_LOCAL_OP:
				case AML_LOAD_OP:   /* ddb_handle from LOAD_OP or LOAD_TABLE_OP */

					ACPI_DEBUG_ONLY_MEMBERS (ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
						"Operand is a Reference, ref_opcode [%s]\n",
						(acpi_ps_get_opcode_info (obj_desc->reference.opcode))->name)));
					break;

				default:
					ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
						"Operand is a Reference, Unknown Reference Opcode %X [%s]\n",
						obj_desc->reference.opcode,
						(acpi_ps_get_opcode_info (obj_desc->reference.opcode))->name));

					return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
				}
			}
			break;


		default:

			/* Invalid descriptor */

			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
					"Invalid descriptor %p [%s]\n",
					obj_desc, acpi_ut_get_descriptor_name (obj_desc)));

			return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
		}


		/*
		 * Get one argument type, point to the next
		 */
		this_arg_type = GET_CURRENT_ARG_TYPE (arg_types);
		INCREMENT_ARG_LIST (arg_types);

		/*
		 * Handle cases where the object does not need to be
		 * resolved to a value
		 */
		switch (this_arg_type) {
		case ARGI_REF_OR_STRING:        /* Can be a String or Reference */

			if ((ACPI_GET_DESCRIPTOR_TYPE (obj_desc) == ACPI_DESC_TYPE_OPERAND) &&
				(ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_STRING)) {
				/*
				 * String found - the string references a named object and must be
				 * resolved to a node
				 */
				goto next_operand;
			}

			/* Else not a string - fall through to the normal Reference case below */
			/*lint -fallthrough */

		case ARGI_REFERENCE:            /* References: */
		case ARGI_INTEGER_REF:
		case ARGI_OBJECT_REF:
		case ARGI_DEVICE_REF:
		case ARGI_TARGETREF:            /* Allows implicit conversion rules before store */
		case ARGI_FIXED_TARGET:         /* No implicit conversion before store to target */
		case ARGI_SIMPLE_TARGET:        /* Name, Local, or Arg - no implicit conversion  */

			/* Need an operand of type ACPI_TYPE_LOCAL_REFERENCE */

			if (ACPI_GET_DESCRIPTOR_TYPE (obj_desc) == ACPI_DESC_TYPE_NAMED) /* Node (name) ptr OK as-is */ {
				goto next_operand;
			}

			status = acpi_ex_check_object_type (ACPI_TYPE_LOCAL_REFERENCE,
					  object_type, obj_desc);
			if (ACPI_FAILURE (status)) {
				return_ACPI_STATUS (status);
			}

			if (AML_NAME_OP == obj_desc->reference.opcode) {
				/*
				 * Convert an indirect name ptr to direct name ptr and put
				 * it on the stack
				 */
				temp_node = obj_desc->reference.object;
				acpi_ut_remove_reference (obj_desc);
				(*stack_ptr) = temp_node;
			}
			goto next_operand;


		case ARGI_DATAREFOBJ:  /* Store operator only */

			/*
			 * We don't want to resolve index_op reference objects during
			 * a store because this would be an implicit de_ref_of operation.
			 * Instead, we just want to store the reference object.
			 * -- All others must be resolved below.
			 */
			if ((opcode == AML_STORE_OP) &&
				(ACPI_GET_OBJECT_TYPE (*stack_ptr) == ACPI_TYPE_LOCAL_REFERENCE) &&
				((*stack_ptr)->reference.opcode == AML_INDEX_OP)) {
				goto next_operand;
			}
			break;

		default:
			/* All cases covered above */