drivers/acpi/acpica/nsarguments.c - linux/kernel/git/bpf/bpf - Git at Google

 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
 /******************************************************************************
  *
  * Module Name: nsarguments - Validation of args for ACPI predefined methods
  *
  * Copyright (C) 2000 - 2020, Intel Corp.
  *
  *****************************************************************************/

 #include <acpi/acpi.h>
 #include "accommon.h"
 #include "acnamesp.h"
 #include "acpredef.h"

 #define _COMPONENT          ACPI_NAMESPACE
 ACPI_MODULE_NAME("nsarguments")

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ns_check_argument_types
  *
  * PARAMETERS:  info            - Method execution information block
  *
  * RETURN:      None
  *
  * DESCRIPTION: Check the incoming argument count and all argument types
  *              against the argument type list for a predefined name.
  *
  ******************************************************************************/
 void acpi_ns_check_argument_types(struct acpi_evaluate_info *info)
 {
 	u16 arg_type_list;
 	u8 arg_count;
 	u8 arg_type;
 	u8 user_arg_type;
 	u32 i;

 	/*
 	 * If not a predefined name, cannot typecheck args, because
 	 * we have no idea what argument types are expected.
 	 * Also, ignore typecheck if warnings/errors if this method
 	 * has already been evaluated at least once -- in order
 	 * to suppress repetitive messages.
 	 */
 	if (!info->predefined || (info->node->flags & ANOBJ_EVALUATED)) {
 		return;
 	}

 	arg_type_list = info->predefined->info.argument_list;
 	arg_count = METHOD_GET_ARG_COUNT(arg_type_list);

 	/* Typecheck all arguments */

 	for (i = 0; ((i < arg_count) && (i < info->param_count)); i++) {
 		arg_type = METHOD_GET_NEXT_TYPE(arg_type_list);
 		user_arg_type = info->parameters[i]->common.type;

 		if (user_arg_type != arg_type) {
 			ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
 					      ACPI_WARN_ALWAYS,
 					      "Argument #%u type mismatch - "
 					      "Found [%s], ACPI requires [%s]",
 					      (i + 1),
 					      acpi_ut_get_type_name
 					      (user_arg_type),
 					      acpi_ut_get_type_name(arg_type)));

 			/* Prevent any additional typechecking for this method */

 			info->node->flags |= ANOBJ_EVALUATED;
 		}
 	}
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ns_check_acpi_compliance
  *
  * PARAMETERS:  pathname        - Full pathname to the node (for error msgs)
  *              node            - Namespace node for the method/object
  *              predefined      - Pointer to entry in predefined name table
  *
  * RETURN:      None
  *
  * DESCRIPTION: Check that the declared parameter count (in ASL/AML) for a
  *              predefined name is what is expected (matches what is defined in
  *              the ACPI specification for this predefined name.)
  *
  ******************************************************************************/

 void
 acpi_ns_check_acpi_compliance(char *pathname,
 			      struct acpi_namespace_node *node,
 			      const union acpi_predefined_info *predefined)
 {
 	u32 aml_param_count;
 	u32 required_param_count;

 	if (!predefined || (node->flags & ANOBJ_EVALUATED)) {
 		return;
 	}

 	/* Get the ACPI-required arg count from the predefined info table */

 	required_param_count =
 	    METHOD_GET_ARG_COUNT(predefined->info.argument_list);

 	/*
 	 * If this object is not a control method, we can check if the ACPI
 	 * spec requires that it be a method.
 	 */
 	if (node->type != ACPI_TYPE_METHOD) {
 		if (required_param_count > 0) {

 			/* Object requires args, must be implemented as a method */

 			ACPI_BIOS_ERROR_PREDEFINED((AE_INFO, pathname,
 						    ACPI_WARN_ALWAYS,
 						    "Object (%s) must be a control method with %u arguments",
 						    acpi_ut_get_type_name(node->
 									  type),
 						    required_param_count));
 		} else if (!required_param_count
 			   && !predefined->info.expected_btypes) {

 			/* Object requires no args and no return value, must be a method */

 			ACPI_BIOS_ERROR_PREDEFINED((AE_INFO, pathname,
 						    ACPI_WARN_ALWAYS,
 						    "Object (%s) must be a control method "
 						    "with no arguments and no return value",
 						    acpi_ut_get_type_name(node->
 									  type)));
 		}

 		return;
 	}

 	/*
 	 * This is a control method.
 	 * Check that the ASL/AML-defined parameter count for this method
 	 * matches the ACPI-required parameter count
 	 *
 	 * Some methods are allowed to have a "minimum" number of args (_SCP)
 	 * because their definition in ACPI has changed over time.
 	 *
 	 * Note: These are BIOS errors in the declaration of the object
 	 */
 	aml_param_count = node->object->method.param_count;

 	if (aml_param_count < required_param_count) {
 		ACPI_BIOS_ERROR_PREDEFINED((AE_INFO, pathname, ACPI_WARN_ALWAYS,
 					    "Insufficient arguments - "
 					    "ASL declared %u, ACPI requires %u",
 					    aml_param_count,
 					    required_param_count));
 	} else if ((aml_param_count > required_param_count)
 		   && !(predefined->info.
 			argument_list & ARG_COUNT_IS_MINIMUM)) {
 		ACPI_BIOS_ERROR_PREDEFINED((AE_INFO, pathname, ACPI_WARN_ALWAYS,
 					    "Excess arguments - "
 					    "ASL declared %u, ACPI requires %u",
 					    aml_param_count,
 					    required_param_count));
 	}
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ns_check_argument_count
  *
  * PARAMETERS:  pathname        - Full pathname to the node (for error msgs)
  *              node            - Namespace node for the method/object
  *              user_param_count - Number of args passed in by the caller
  *              predefined      - Pointer to entry in predefined name table
  *
  * RETURN:      None
  *
  * DESCRIPTION: Check that incoming argument count matches the declared
  *              parameter count (in the ASL/AML) for an object.
  *
  ******************************************************************************/

 void
 acpi_ns_check_argument_count(char *pathname,
 			     struct acpi_namespace_node *node,
 			     u32 user_param_count,
 			     const union acpi_predefined_info *predefined)
 {
 	u32 aml_param_count;
 	u32 required_param_count;

 	if (node->flags & ANOBJ_EVALUATED) {
 		return;
 	}

 	if (!predefined) {
 		/*
 		 * Not a predefined name. Check the incoming user argument count
 		 * against the count that is specified in the method/object.
 		 */
 		if (node->type != ACPI_TYPE_METHOD) {
 			if (user_param_count) {
 				ACPI_INFO_PREDEFINED((AE_INFO, pathname,
 						      ACPI_WARN_ALWAYS,
 						      "%u arguments were passed to a non-method ACPI object (%s)",
 						      user_param_count,
 						      acpi_ut_get_type_name
 						      (node->type)));
 			}

 			return;
 		}

 		/*
 		 * This is a control method. Check the parameter count.
 		 * We can only check the incoming argument count against the
 		 * argument count declared for the method in the ASL/AML.
 		 *
 		 * Emit a message if too few or too many arguments have been passed
 		 * by the caller.
 		 *
 		 * Note: Too many arguments will not cause the method to
 		 * fail. However, the method will fail if there are too few
 		 * arguments and the method attempts to use one of the missing ones.
 		 */
 		aml_param_count = node->object->method.param_count;

 		if (user_param_count < aml_param_count) {
 			ACPI_WARN_PREDEFINED((AE_INFO, pathname,
 					      ACPI_WARN_ALWAYS,
 					      "Insufficient arguments - "
 					      "Caller passed %u, method requires %u",
 					      user_param_count,
 					      aml_param_count));
 		} else if (user_param_count > aml_param_count) {
 			ACPI_INFO_PREDEFINED((AE_INFO, pathname,
 					      ACPI_WARN_ALWAYS,
 					      "Excess arguments - "
 					      "Caller passed %u, method requires %u",
 					      user_param_count,
 					      aml_param_count));
 		}

 		return;
 	}

 	/*
 	 * This is a predefined name. Validate the user-supplied parameter
 	 * count against the ACPI specification. We don't validate against
 	 * the method itself because what is important here is that the
 	 * caller is in conformance with the spec. (The arg count for the
 	 * method was checked against the ACPI spec earlier.)
 	 *
 	 * Some methods are allowed to have a "minimum" number of args (_SCP)
 	 * because their definition in ACPI has changed over time.
 	 */
 	required_param_count =
 	    METHOD_GET_ARG_COUNT(predefined->info.argument_list);

 	if (user_param_count < required_param_count) {
 		ACPI_WARN_PREDEFINED((AE_INFO, pathname, ACPI_WARN_ALWAYS,
 				      "Insufficient arguments - "
 				      "Caller passed %u, ACPI requires %u",
 				      user_param_count, required_param_count));
 	} else if ((user_param_count > required_param_count) &&
 		   !(predefined->info.argument_list & ARG_COUNT_IS_MINIMUM)) {
 		ACPI_INFO_PREDEFINED((AE_INFO, pathname, ACPI_WARN_ALWAYS,
 				      "Excess arguments - "
 				      "Caller passed %u, ACPI requires %u",
 				      user_param_count, required_param_count));
 	}
 }
	// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
	/******************************************************************************
	*
	* Module Name: nsarguments - Validation of args for ACPI predefined methods
	*
	* Copyright (C) 2000 - 2020, Intel Corp.
	*
	*****************************************************************************/

	#include <acpi/acpi.h>
	#include "accommon.h"
	#include "acnamesp.h"
	#include "acpredef.h"

	#define _COMPONENT ACPI_NAMESPACE
	ACPI_MODULE_NAME("nsarguments")

	/*******************************************************************************
	*
	* FUNCTION: acpi_ns_check_argument_types
	*
	* PARAMETERS: info - Method execution information block
	*
	* RETURN: None
	*
	* DESCRIPTION: Check the incoming argument count and all argument types
	* against the argument type list for a predefined name.
	*
	******************************************************************************/
	void acpi_ns_check_argument_types(struct acpi_evaluate_info *info)
	{
	u16 arg_type_list;
	u8 arg_count;
	u8 arg_type;
	u8 user_arg_type;
	u32 i;

	/*
	* If not a predefined name, cannot typecheck args, because
	* we have no idea what argument types are expected.
	* Also, ignore typecheck if warnings/errors if this method
	* has already been evaluated at least once -- in order
	* to suppress repetitive messages.
	*/
	if (!info->predefined \|\| (info->node->flags & ANOBJ_EVALUATED)) {
	return;
	}

	arg_type_list = info->predefined->info.argument_list;
	arg_count = METHOD_GET_ARG_COUNT(arg_type_list);

	/* Typecheck all arguments */

	for (i = 0; ((i < arg_count) && (i < info->param_count)); i++) {
	arg_type = METHOD_GET_NEXT_TYPE(arg_type_list);
	user_arg_type = info->parameters[i]->common.type;

	if (user_arg_type != arg_type) {
	ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
	ACPI_WARN_ALWAYS,
	"Argument #%u type mismatch - "
	"Found [%s], ACPI requires [%s]",
	(i + 1),
	acpi_ut_get_type_name
	(user_arg_type),
	acpi_ut_get_type_name(arg_type)));

	/* Prevent any additional typechecking for this method */

	info->node->flags \|= ANOBJ_EVALUATED;
	}
	}
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ns_check_acpi_compliance
	*
	* PARAMETERS: pathname - Full pathname to the node (for error msgs)
	* node - Namespace node for the method/object
	* predefined - Pointer to entry in predefined name table
	*
	* RETURN: None
	*
	* DESCRIPTION: Check that the declared parameter count (in ASL/AML) for a
	* predefined name is what is expected (matches what is defined in
	* the ACPI specification for this predefined name.)
	*
	******************************************************************************/

	void
	acpi_ns_check_acpi_compliance(char *pathname,
	struct acpi_namespace_node *node,
	const union acpi_predefined_info *predefined)
	{
	u32 aml_param_count;
	u32 required_param_count;

	if (!predefined \|\| (node->flags & ANOBJ_EVALUATED)) {
	return;
	}

	/* Get the ACPI-required arg count from the predefined info table */

	required_param_count =
	METHOD_GET_ARG_COUNT(predefined->info.argument_list);

	/*
	* If this object is not a control method, we can check if the ACPI
	* spec requires that it be a method.
	*/
	if (node->type != ACPI_TYPE_METHOD) {
	if (required_param_count > 0) {

	/* Object requires args, must be implemented as a method */

	ACPI_BIOS_ERROR_PREDEFINED((AE_INFO, pathname,
	ACPI_WARN_ALWAYS,
	"Object (%s) must be a control method with %u arguments",
	acpi_ut_get_type_name(node->
	type),
	required_param_count));
	} else if (!required_param_count
	&& !predefined->info.expected_btypes) {

	/* Object requires no args and no return value, must be a method */

	ACPI_BIOS_ERROR_PREDEFINED((AE_INFO, pathname,
	ACPI_WARN_ALWAYS,
	"Object (%s) must be a control method "
	"with no arguments and no return value",
	acpi_ut_get_type_name(node->
	type)));
	}

	return;
	}

	/*
	* This is a control method.
	* Check that the ASL/AML-defined parameter count for this method
	* matches the ACPI-required parameter count
	*
	* Some methods are allowed to have a "minimum" number of args (_SCP)
	* because their definition in ACPI has changed over time.
	*
	* Note: These are BIOS errors in the declaration of the object
	*/
	aml_param_count = node->object->method.param_count;

	if (aml_param_count < required_param_count) {
	ACPI_BIOS_ERROR_PREDEFINED((AE_INFO, pathname, ACPI_WARN_ALWAYS,
	"Insufficient arguments - "
	"ASL declared %u, ACPI requires %u",
	aml_param_count,
	required_param_count));
	} else if ((aml_param_count > required_param_count)
	&& !(predefined->info.
	argument_list & ARG_COUNT_IS_MINIMUM)) {
	ACPI_BIOS_ERROR_PREDEFINED((AE_INFO, pathname, ACPI_WARN_ALWAYS,
	"Excess arguments - "
	"ASL declared %u, ACPI requires %u",
	aml_param_count,
	required_param_count));
	}
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ns_check_argument_count
	*
	* PARAMETERS: pathname - Full pathname to the node (for error msgs)
	* node - Namespace node for the method/object
	* user_param_count - Number of args passed in by the caller
	* predefined - Pointer to entry in predefined name table
	*
	* RETURN: None
	*
	* DESCRIPTION: Check that incoming argument count matches the declared
	* parameter count (in the ASL/AML) for an object.
	*
	******************************************************************************/

	void
	acpi_ns_check_argument_count(char *pathname,
	struct acpi_namespace_node *node,
	u32 user_param_count,
	const union acpi_predefined_info *predefined)
	{
	u32 aml_param_count;
	u32 required_param_count;

	if (node->flags & ANOBJ_EVALUATED) {
	return;
	}

	if (!predefined) {
	/*
	* Not a predefined name. Check the incoming user argument count
	* against the count that is specified in the method/object.
	*/
	if (node->type != ACPI_TYPE_METHOD) {
	if (user_param_count) {
	ACPI_INFO_PREDEFINED((AE_INFO, pathname,
	ACPI_WARN_ALWAYS,
	"%u arguments were passed to a non-method ACPI object (%s)",
	user_param_count,
	acpi_ut_get_type_name
	(node->type)));
	}

	return;
	}

	/*
	* This is a control method. Check the parameter count.
	* We can only check the incoming argument count against the
	* argument count declared for the method in the ASL/AML.
	*
	* Emit a message if too few or too many arguments have been passed
	* by the caller.
	*
	* Note: Too many arguments will not cause the method to
	* fail. However, the method will fail if there are too few
	* arguments and the method attempts to use one of the missing ones.
	*/
	aml_param_count = node->object->method.param_count;

	if (user_param_count < aml_param_count) {
	ACPI_WARN_PREDEFINED((AE_INFO, pathname,
	ACPI_WARN_ALWAYS,
	"Insufficient arguments - "
	"Caller passed %u, method requires %u",
	user_param_count,
	aml_param_count));
	} else if (user_param_count > aml_param_count) {
	ACPI_INFO_PREDEFINED((AE_INFO, pathname,
	ACPI_WARN_ALWAYS,
	"Excess arguments - "
	"Caller passed %u, method requires %u",
	user_param_count,
	aml_param_count));
	}

	return;
	}

	/*
	* This is a predefined name. Validate the user-supplied parameter
	* count against the ACPI specification. We don't validate against
	* the method itself because what is important here is that the
	* caller is in conformance with the spec. (The arg count for the
	* method was checked against the ACPI spec earlier.)
	*
	* Some methods are allowed to have a "minimum" number of args (_SCP)
	* because their definition in ACPI has changed over time.
	*/
	required_param_count =
	METHOD_GET_ARG_COUNT(predefined->info.argument_list);

	if (user_param_count < required_param_count) {
	ACPI_WARN_PREDEFINED((AE_INFO, pathname, ACPI_WARN_ALWAYS,
	"Insufficient arguments - "
	"Caller passed %u, ACPI requires %u",
	user_param_count, required_param_count));
	} else if ((user_param_count > required_param_count) &&
	!(predefined->info.argument_list & ARG_COUNT_IS_MINIMUM)) {
	ACPI_INFO_PREDEFINED((AE_INFO, pathname, ACPI_WARN_ALWAYS,
	"Excess arguments - "
	"Caller passed %u, ACPI requires %u",
	user_param_count, required_param_count));
	}
	}