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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 | // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 /****************************************************************************** * * Module Name: nsarguments - Validation of args for ACPI predefined methods * * Copyright (C) 2000 - 2022, 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; /* No typechecking for ACPI_TYPE_ANY */ if ((user_arg_type != arg_type) && (arg_type != ACPI_TYPE_ANY)) { 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)); } } |