arch/all-pc/acpica/source/components/namespace/nsarguments.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsarguments - Validation of args for ACPI predefined methods
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include "acpi.h"
  45 #include "accommon.h"
  46 #include "acnamesp.h"
  47 #include "acpredef.h"
  48
  49
  50 #define _COMPONENT          ACPI_NAMESPACE
  51         ACPI_MODULE_NAME    ("nsarguments")
  52
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    AcpiNsCheckArgumentTypes
  57  *
  58  * PARAMETERS:  Info            - Method execution information block
  59  *
  60  * RETURN:      None
  61  *
  62  * DESCRIPTION: Check the incoming argument count and all argument types
  63  *              against the argument type list for a predefined name.
  64  *
  65  ******************************************************************************/
  66
  67 void
  68 AcpiNsCheckArgumentTypes (
  69     ACPI_EVALUATE_INFO          *Info)
  70 {
  71     UINT16                      ArgTypeList;
  72     UINT8                       ArgCount;
  73     UINT8                       ArgType;
  74     UINT8                       UserArgType;
  75     UINT32                      i;
  76
  77
  78     /* If not a predefined name, cannot typecheck args */
  79
  80     if (!Info->Predefined)
  81     {
  82         return;
  83     }
  84
  85     ArgTypeList = Info->Predefined->Info.ArgumentList;
  86     ArgCount = METHOD_GET_ARG_COUNT (ArgTypeList);
  87
  88     /* Typecheck all arguments */
  89
  90     for (i = 0; ((i < ArgCount) && (i < Info->ParamCount)); i++)
  91     {
  92         ArgType = METHOD_GET_NEXT_TYPE (ArgTypeList);
  93         UserArgType = Info->Parameters[i]->Common.Type;
  94
  95         if (UserArgType != ArgType)
  96         {
  97             ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, ACPI_WARN_ALWAYS,
  98                 "Argument #%u type mismatch - "
  99                 "Found [%s], ACPI requires [%s]", (i + 1),
 100                 AcpiUtGetTypeName (UserArgType),
 101                 AcpiUtGetTypeName (ArgType)));
 102         }
 103     }
 104 }
 105
 106
 107 /*******************************************************************************
 108  *
 109  * FUNCTION:    AcpiNsCheckAcpiCompliance
 110  *
 111  * PARAMETERS:  Pathname        - Full pathname to the node (for error msgs)
 112  *              Node            - Namespace node for the method/object
 113  *              Predefined      - Pointer to entry in predefined name table
 114  *
 115  * RETURN:      None
 116  *
 117  * DESCRIPTION: Check that the declared parameter count (in ASL/AML) for a
 118  *              predefined name is what is expected (matches what is defined in
 119  *              the ACPI specification for this predefined name.)
 120  *
 121  ******************************************************************************/
 122
 123 void
 124 AcpiNsCheckAcpiCompliance (
 125     char                        *Pathname,
 126     ACPI_NAMESPACE_NODE         *Node,
 127     const ACPI_PREDEFINED_INFO  *Predefined)
 128 {
 129     UINT32                      AmlParamCount;
 130     UINT32                      RequiredParamCount;
 131
 132
 133     if (!Predefined)
 134     {
 135         return;
 136     }
 137
 138     /* Get the ACPI-required arg count from the predefined info table */
 139
 140     RequiredParamCount = METHOD_GET_ARG_COUNT (Predefined->Info.ArgumentList);
 141
 142     /*
 143      * If this object is not a control method, we can check if the ACPI
 144      * spec requires that it be a method.
 145      */
 146     if (Node->Type != ACPI_TYPE_METHOD)
 147     {
 148         if (RequiredParamCount > 0)
 149         {
 150             /* Object requires args, must be implemented as a method */
 151
 152             ACPI_BIOS_ERROR_PREDEFINED ((AE_INFO, Pathname, ACPI_WARN_ALWAYS,
 153                 "Object (%s) must be a control method with %u arguments",
 154                 AcpiUtGetTypeName (Node->Type), RequiredParamCount));
 155         }
 156         else if (!RequiredParamCount && !Predefined->Info.ExpectedBtypes)
 157         {
 158             /* Object requires no args and no return value, must be a method */
 159
 160             ACPI_BIOS_ERROR_PREDEFINED ((AE_INFO, Pathname, ACPI_WARN_ALWAYS,
 161                 "Object (%s) must be a control method "
 162                 "with no arguments and no return value",
 163                 AcpiUtGetTypeName (Node->Type)));
 164         }
 165
 166         return;
 167     }
 168
 169     /*
 170      * This is a control method.
 171      * Check that the ASL/AML-defined parameter count for this method
 172      * matches the ACPI-required parameter count
 173      *
 174      * Some methods are allowed to have a "minimum" number of args (_SCP)
 175      * because their definition in ACPI has changed over time.
 176      *
 177      * Note: These are BIOS errors in the declaration of the object
 178      */
 179     AmlParamCount = Node->Object->Method.ParamCount;
 180
 181     if (AmlParamCount < RequiredParamCount)
 182     {
 183         ACPI_BIOS_ERROR_PREDEFINED ((AE_INFO, Pathname, ACPI_WARN_ALWAYS,
 184             "Insufficient arguments - "
 185             "ASL declared %u, ACPI requires %u",
 186             AmlParamCount, RequiredParamCount));
 187     }
 188     else if ((AmlParamCount > RequiredParamCount) &&
 189         !(Predefined->Info.ArgumentList & ARG_COUNT_IS_MINIMUM))
 190     {
 191         ACPI_BIOS_ERROR_PREDEFINED ((AE_INFO, Pathname, ACPI_WARN_ALWAYS,
 192             "Excess arguments - "
 193             "ASL declared %u, ACPI requires %u",
 194             AmlParamCount, RequiredParamCount));
 195     }
 196 }
 197
 198
 199 /*******************************************************************************
 200  *
 201  * FUNCTION:    AcpiNsCheckArgumentCount
 202  *
 203  * PARAMETERS:  Pathname        - Full pathname to the node (for error msgs)
 204  *              Node            - Namespace node for the method/object
 205  *              UserParamCount  - Number of args passed in by the caller
 206  *              Predefined      - Pointer to entry in predefined name table
 207  *
 208  * RETURN:      None
 209  *
 210  * DESCRIPTION: Check that incoming argument count matches the declared
 211  *              parameter count (in the ASL/AML) for an object.
 212  *
 213  ******************************************************************************/
 214
 215 void
 216 AcpiNsCheckArgumentCount (
 217     char                        *Pathname,
 218     ACPI_NAMESPACE_NODE         *Node,
 219     UINT32                      UserParamCount,
 220     const ACPI_PREDEFINED_INFO  *Predefined)
 221 {
 222     UINT32                      AmlParamCount;
 223     UINT32                      RequiredParamCount;
 224
 225
 226     if (!Predefined)
 227     {
 228         /*
 229          * Not a predefined name. Check the incoming user argument count
 230          * against the count that is specified in the method/object.
 231          */
 232         if (Node->Type != ACPI_TYPE_METHOD)
 233         {
 234             if (UserParamCount)
 235             {
 236                 ACPI_INFO_PREDEFINED ((AE_INFO, Pathname, ACPI_WARN_ALWAYS,
 237                     "%u arguments were passed to a non-method ACPI object (%s)",
 238                     UserParamCount, AcpiUtGetTypeName (Node->Type)));
 239             }
 240
 241             return;
 242         }
 243
 244         /*
 245          * This is a control method. Check the parameter count.
 246          * We can only check the incoming argument count against the
 247          * argument count declared for the method in the ASL/AML.
 248          *
 249          * Emit a message if too few or too many arguments have been passed
 250          * by the caller.
 251          *
 252          * Note: Too many arguments will not cause the method to
 253          * fail. However, the method will fail if there are too few
 254          * arguments and the method attempts to use one of the missing ones.
 255          */
 256         AmlParamCount = Node->Object->Method.ParamCount;
 257
 258         if (UserParamCount < AmlParamCount)
 259         {
 260             ACPI_WARN_PREDEFINED ((AE_INFO, Pathname, ACPI_WARN_ALWAYS,
 261                 "Insufficient arguments - "
 262                 "Caller passed %u, method requires %u",
 263                 UserParamCount, AmlParamCount));
 264         }
 265         else if (UserParamCount > AmlParamCount)
 266         {
 267             ACPI_INFO_PREDEFINED ((AE_INFO, Pathname, ACPI_WARN_ALWAYS,
 268                 "Excess arguments - "
 269                 "Caller passed %u, method requires %u",
 270                 UserParamCount, AmlParamCount));
 271         }
 272
 273         return;
 274     }
 275
 276     /*
 277      * This is a predefined name. Validate the user-supplied parameter
 278      * count against the ACPI specification. We don't validate against
 279      * the method itself because what is important here is that the
 280      * caller is in conformance with the spec. (The arg count for the
 281      * method was checked against the ACPI spec earlier.)
 282      *
 283      * Some methods are allowed to have a "minimum" number of args (_SCP)
 284      * because their definition in ACPI has changed over time.
 285      */
 286     RequiredParamCount = METHOD_GET_ARG_COUNT (Predefined->Info.ArgumentList);
 287
 288     if (UserParamCount < RequiredParamCount)
 289     {
 290         ACPI_WARN_PREDEFINED ((AE_INFO, Pathname, ACPI_WARN_ALWAYS,
 291             "Insufficient arguments - "
 292             "Caller passed %u, ACPI requires %u",
 293             UserParamCount, RequiredParamCount));
 294     }
 295     else if ((UserParamCount > RequiredParamCount) &&
 296         !(Predefined->Info.ArgumentList & ARG_COUNT_IS_MINIMUM))
 297     {
 298         ACPI_INFO_PREDEFINED ((AE_INFO, Pathname, ACPI_WARN_ALWAYS,
 299             "Excess arguments - "
 300             "Caller passed %u, ACPI requires %u",
 301             UserParamCount, RequiredParamCount));
 302     }
 303 }