exresop.c

linux-2.6.15.6

/******************************************************************************
 *
 * 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")

/* Local prototypes */
static acpi_status
acpi_ex_check_object_type(acpi_object_type type_needed,
			  acpi_object_type this_type, void *object);

/*******************************************************************************
 *
 * 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
 *
 ******************************************************************************/

static 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;
	u16 target_op = 0;

	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:

			/* Namespace 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:
					target_op = AML_DEBUG_OP;

					/*lint -fallthrough */

				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 */
				case AML_INT_NAMEPATH_OP:	/* Reference to a named object */

					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
			 * A Namespace Node is OK as-is
			 */
			if (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) ==
			    ACPI_DESC_TYPE_NAMED) {
				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 (obj_desc->reference.opcode == AML_NAME_OP) {
				/* Convert a named reference to the actual named object */

				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 */
			break;
		}

		/*