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1/******************************************************************************
2 *
3 * Module Name: nsarguments - Validation of args for ACPI predefined methods
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2016, 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/acpi.h>
45#include "accommon.h"
46#include "acnamesp.h"
47#include "acpredef.h"
48
49#define _COMPONENT ACPI_NAMESPACE
50ACPI_MODULE_NAME("nsarguments")
51
52/*******************************************************************************
53 *
54 * FUNCTION: acpi_ns_check_argument_types
55 *
56 * PARAMETERS: info - Method execution information block
57 *
58 * RETURN: None
59 *
60 * DESCRIPTION: Check the incoming argument count and all argument types
61 * against the argument type list for a predefined name.
62 *
63 ******************************************************************************/
64void acpi_ns_check_argument_types(struct acpi_evaluate_info *info)
65{
66 u16 arg_type_list;
67 u8 arg_count;
68 u8 arg_type;
69 u8 user_arg_type;
70 u32 i;
71
72 /* If not a predefined name, cannot typecheck args */
73
74 if (!info->predefined) {
75 return;
76 }
77
78 arg_type_list = info->predefined->info.argument_list;
79 arg_count = METHOD_GET_ARG_COUNT(arg_type_list);
80
81 /* Typecheck all arguments */
82
83 for (i = 0; ((i < arg_count) && (i < info->param_count)); i++) {
84 arg_type = METHOD_GET_NEXT_TYPE(arg_type_list);
85 user_arg_type = info->parameters[i]->common.type;
86
87 if (user_arg_type != arg_type) {
88 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
89 ACPI_WARN_ALWAYS,
90 "Argument #%u type mismatch - "
91 "Found [%s], ACPI requires [%s]",
92 (i + 1),
93 acpi_ut_get_type_name
94 (user_arg_type),
95 acpi_ut_get_type_name(arg_type)));
96 }
97 }
98}
99
100/*******************************************************************************
101 *
102 * FUNCTION: acpi_ns_check_acpi_compliance
103 *
104 * PARAMETERS: pathname - Full pathname to the node (for error msgs)
105 * node - Namespace node for the method/object
106 * predefined - Pointer to entry in predefined name table
107 *
108 * RETURN: None
109 *
110 * DESCRIPTION: Check that the declared parameter count (in ASL/AML) for a
111 * predefined name is what is expected (matches what is defined in
112 * the ACPI specification for this predefined name.)
113 *
114 ******************************************************************************/
115
116void
117acpi_ns_check_acpi_compliance(char *pathname,
118 struct acpi_namespace_node *node,
119 const union acpi_predefined_info *predefined)
120{
121 u32 aml_param_count;
122 u32 required_param_count;
123
124 if (!predefined) {
125 return;
126 }
127
128 /* Get the ACPI-required arg count from the predefined info table */
129
130 required_param_count =
131 METHOD_GET_ARG_COUNT(predefined->info.argument_list);
132
133 /*
134 * If this object is not a control method, we can check if the ACPI
135 * spec requires that it be a method.
136 */
137 if (node->type != ACPI_TYPE_METHOD) {
138 if (required_param_count > 0) {
139
140 /* Object requires args, must be implemented as a method */
141
142 ACPI_BIOS_ERROR_PREDEFINED((AE_INFO, pathname,
143 ACPI_WARN_ALWAYS,
144 "Object (%s) must be a control method with %u arguments",
145 acpi_ut_get_type_name(node->
146 type),
147 required_param_count));
148 } else if (!required_param_count
149 && !predefined->info.expected_btypes) {
150
151 /* Object requires no args and no return value, must be a method */
152
153 ACPI_BIOS_ERROR_PREDEFINED((AE_INFO, pathname,
154 ACPI_WARN_ALWAYS,
155 "Object (%s) must be a control method "
156 "with no arguments and no return value",
157 acpi_ut_get_type_name(node->
158 type)));
159 }
160
161 return;
162 }
163
164 /*
165 * This is a control method.
166 * Check that the ASL/AML-defined parameter count for this method
167 * matches the ACPI-required parameter count
168 *
169 * Some methods are allowed to have a "minimum" number of args (_SCP)
170 * because their definition in ACPI has changed over time.
171 *
172 * Note: These are BIOS errors in the declaration of the object
173 */
174 aml_param_count = node->object->method.param_count;
175
176 if (aml_param_count < required_param_count) {
177 ACPI_BIOS_ERROR_PREDEFINED((AE_INFO, pathname, ACPI_WARN_ALWAYS,
178 "Insufficient arguments - "
179 "ASL declared %u, ACPI requires %u",
180 aml_param_count,
181 required_param_count));
182 } else if ((aml_param_count > required_param_count)
183 && !(predefined->info.
184 argument_list & ARG_COUNT_IS_MINIMUM)) {
185 ACPI_BIOS_ERROR_PREDEFINED((AE_INFO, pathname, ACPI_WARN_ALWAYS,
186 "Excess arguments - "
187 "ASL declared %u, ACPI requires %u",
188 aml_param_count,
189 required_param_count));
190 }
191}
192
193/*******************************************************************************
194 *
195 * FUNCTION: acpi_ns_check_argument_count
196 *
197 * PARAMETERS: pathname - Full pathname to the node (for error msgs)
198 * node - Namespace node for the method/object
199 * user_param_count - Number of args passed in by the caller
200 * predefined - Pointer to entry in predefined name table
201 *
202 * RETURN: None
203 *
204 * DESCRIPTION: Check that incoming argument count matches the declared
205 * parameter count (in the ASL/AML) for an object.
206 *
207 ******************************************************************************/
208
209void
210acpi_ns_check_argument_count(char *pathname,
211 struct acpi_namespace_node *node,
212 u32 user_param_count,
213 const union acpi_predefined_info *predefined)
214{
215 u32 aml_param_count;
216 u32 required_param_count;
217
218 if (!predefined) {
219 /*
220 * Not a predefined name. Check the incoming user argument count
221 * against the count that is specified in the method/object.
222 */
223 if (node->type != ACPI_TYPE_METHOD) {
224 if (user_param_count) {
225 ACPI_INFO_PREDEFINED((AE_INFO, pathname,
226 ACPI_WARN_ALWAYS,
227 "%u arguments were passed to a non-method ACPI object (%s)",
228 user_param_count,
229 acpi_ut_get_type_name
230 (node->type)));
231 }
232
233 return;
234 }
235
236 /*
237 * This is a control method. Check the parameter count.
238 * We can only check the incoming argument count against the
239 * argument count declared for the method in the ASL/AML.
240 *
241 * Emit a message if too few or too many arguments have been passed
242 * by the caller.
243 *
244 * Note: Too many arguments will not cause the method to
245 * fail. However, the method will fail if there are too few
246 * arguments and the method attempts to use one of the missing ones.
247 */
248 aml_param_count = node->object->method.param_count;
249
250 if (user_param_count < aml_param_count) {
251 ACPI_WARN_PREDEFINED((AE_INFO, pathname,
252 ACPI_WARN_ALWAYS,
253 "Insufficient arguments - "
254 "Caller passed %u, method requires %u",
255 user_param_count,
256 aml_param_count));
257 } else if (user_param_count > aml_param_count) {
258 ACPI_INFO_PREDEFINED((AE_INFO, pathname,
259 ACPI_WARN_ALWAYS,
260 "Excess arguments - "
261 "Caller passed %u, method requires %u",
262 user_param_count,
263 aml_param_count));
264 }
265
266 return;
267 }
268
269 /*
270 * This is a predefined name. Validate the user-supplied parameter
271 * count against the ACPI specification. We don't validate against
272 * the method itself because what is important here is that the
273 * caller is in conformance with the spec. (The arg count for the
274 * method was checked against the ACPI spec earlier.)
275 *
276 * Some methods are allowed to have a "minimum" number of args (_SCP)
277 * because their definition in ACPI has changed over time.
278 */
279 required_param_count =
280 METHOD_GET_ARG_COUNT(predefined->info.argument_list);
281
282 if (user_param_count < required_param_count) {
283 ACPI_WARN_PREDEFINED((AE_INFO, pathname, ACPI_WARN_ALWAYS,
284 "Insufficient arguments - "
285 "Caller passed %u, ACPI requires %u",
286 user_param_count, required_param_count));
287 } else if ((user_param_count > required_param_count) &&
288 !(predefined->info.argument_list & ARG_COUNT_IS_MINIMUM)) {
289 ACPI_INFO_PREDEFINED((AE_INFO, pathname, ACPI_WARN_ALWAYS,
290 "Excess arguments - "
291 "Caller passed %u, ACPI requires %u",
292 user_param_count, required_param_count));
293 }
294}