1 /******************************************************************************
2  *
3  * Module Name: exstorob - AML object store support, store to object
4  *
5  *****************************************************************************/
6 
7 /******************************************************************************
8  *
9  * 1. Copyright Notice
10  *
11  * Some or all of this work - Copyright (c) 1999 - 2017, Intel Corp.
12  * All rights reserved.
13  *
14  * 2. License
15  *
16  * 2.1. This is your license from Intel Corp. under its intellectual property
17  * rights. You may have additional license terms from the party that provided
18  * you this software, covering your right to use that party's intellectual
19  * property rights.
20  *
21  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22  * copy of the source code appearing in this file ("Covered Code") an
23  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24  * base code distributed originally by Intel ("Original Intel Code") to copy,
25  * make derivatives, distribute, use and display any portion of the Covered
26  * Code in any form, with the right to sublicense such rights; and
27  *
28  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29  * license (with the right to sublicense), under only those claims of Intel
30  * patents that are infringed by the Original Intel Code, to make, use, sell,
31  * offer to sell, and import the Covered Code and derivative works thereof
32  * solely to the minimum extent necessary to exercise the above copyright
33  * license, and in no event shall the patent license extend to any additions
34  * to or modifications of the Original Intel Code. No other license or right
35  * is granted directly or by implication, estoppel or otherwise;
36  *
37  * The above copyright and patent license is granted only if the following
38  * conditions are met:
39  *
40  * 3. Conditions
41  *
42  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43  * Redistribution of source code of any substantial portion of the Covered
44  * Code or modification with rights to further distribute source must include
45  * the above Copyright Notice, the above License, this list of Conditions,
46  * and the following Disclaimer and Export Compliance provision. In addition,
47  * Licensee must cause all Covered Code to which Licensee contributes to
48  * contain a file documenting the changes Licensee made to create that Covered
49  * Code and the date of any change. Licensee must include in that file the
50  * documentation of any changes made by any predecessor Licensee. Licensee
51  * must include a prominent statement that the modification is derived,
52  * directly or indirectly, from Original Intel Code.
53  *
54  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55  * Redistribution of source code of any substantial portion of the Covered
56  * Code or modification without rights to further distribute source must
57  * include the following Disclaimer and Export Compliance provision in the
58  * documentation and/or other materials provided with distribution. In
59  * addition, Licensee may not authorize further sublicense of source of any
60  * portion of the Covered Code, and must include terms to the effect that the
61  * license from Licensee to its licensee is limited to the intellectual
62  * property embodied in the software Licensee provides to its licensee, and
63  * not to intellectual property embodied in modifications its licensee may
64  * make.
65  *
66  * 3.3. Redistribution of Executable. Redistribution in executable form of any
67  * substantial portion of the Covered Code or modification must reproduce the
68  * above Copyright Notice, and the following Disclaimer and Export Compliance
69  * provision in the documentation and/or other materials provided with the
70  * distribution.
71  *
72  * 3.4. Intel retains all right, title, and interest in and to the Original
73  * Intel Code.
74  *
75  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76  * Intel shall be used in advertising or otherwise to promote the sale, use or
77  * other dealings in products derived from or relating to the Covered Code
78  * without prior written authorization from Intel.
79  *
80  * 4. Disclaimer and Export Compliance
81  *
82  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83  * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85  * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86  * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
88  * PARTICULAR PURPOSE.
89  *
90  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
97  * LIMITED REMEDY.
98  *
99  * 4.3. Licensee shall not export, either directly or indirectly, any of this
100  * software or system incorporating such software without first obtaining any
101  * required license or other approval from the U. S. Department of Commerce or
102  * any other agency or department of the United States Government. In the
103  * event Licensee exports any such software from the United States or
104  * re-exports any such software from a foreign destination, Licensee shall
105  * ensure that the distribution and export/re-export of the software is in
106  * compliance with all laws, regulations, orders, or other restrictions of the
107  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108  * any of its subsidiaries will export/re-export any technical data, process,
109  * software, or service, directly or indirectly, to any country for which the
110  * United States government or any agency thereof requires an export license,
111  * other governmental approval, or letter of assurance, without first obtaining
112  * such license, approval or letter.
113  *
114  *****************************************************************************
115  *
116  * Alternatively, you may choose to be licensed under the terms of the
117  * following license:
118  *
119  * Redistribution and use in source and binary forms, with or without
120  * modification, are permitted provided that the following conditions
121  * are met:
122  * 1. Redistributions of source code must retain the above copyright
123  *    notice, this list of conditions, and the following disclaimer,
124  *    without modification.
125  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
126  *    substantially similar to the "NO WARRANTY" disclaimer below
127  *    ("Disclaimer") and any redistribution must be conditioned upon
128  *    including a substantially similar Disclaimer requirement for further
129  *    binary redistribution.
130  * 3. Neither the names of the above-listed copyright holders nor the names
131  *    of any contributors may be used to endorse or promote products derived
132  *    from this software without specific prior written permission.
133  *
134  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
135  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
136  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
137  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
138  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
139  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
140  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
141  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
142  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
143  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
144  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
145  *
146  * Alternatively, you may choose to be licensed under the terms of the
147  * GNU General Public License ("GPL") version 2 as published by the Free
148  * Software Foundation.
149  *
150  *****************************************************************************/
151 
152 #include "acpi.h"
153 #include "accommon.h"
154 #include "acinterp.h"
155 
156 
157 #define _COMPONENT          ACPI_EXECUTER
158         ACPI_MODULE_NAME    ("exstorob")
159 
160 
161 /*******************************************************************************
162  *
163  * FUNCTION:    AcpiExStoreBufferToBuffer
164  *
165  * PARAMETERS:  SourceDesc          - Source object to copy
166  *              TargetDesc          - Destination object of the copy
167  *
168  * RETURN:      Status
169  *
170  * DESCRIPTION: Copy a buffer object to another buffer object.
171  *
172  ******************************************************************************/
173 
174 ACPI_STATUS
175 AcpiExStoreBufferToBuffer (
176     ACPI_OPERAND_OBJECT     *SourceDesc,
177     ACPI_OPERAND_OBJECT     *TargetDesc)
178 {
179     UINT32                  Length;
180     UINT8                   *Buffer;
181 
182 
183     ACPI_FUNCTION_TRACE_PTR (ExStoreBufferToBuffer, SourceDesc);
184 
185 
186     /* If Source and Target are the same, just return */
187 
188     if (SourceDesc == TargetDesc)
189     {
190         return_ACPI_STATUS (AE_OK);
191     }
192 
193     /* We know that SourceDesc is a buffer by now */
194 
195     Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->Buffer.Pointer);
196     Length = SourceDesc->Buffer.Length;
197 
198     /*
199      * If target is a buffer of length zero or is a static buffer,
200      * allocate a new buffer of the proper length
201      */
202     if ((TargetDesc->Buffer.Length == 0) ||
203         (TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER))
204     {
205         TargetDesc->Buffer.Pointer = ACPI_ALLOCATE (Length);
206         if (!TargetDesc->Buffer.Pointer)
207         {
208             return_ACPI_STATUS (AE_NO_MEMORY);
209         }
210 
211         TargetDesc->Buffer.Length = Length;
212     }
213 
214     /* Copy source buffer to target buffer */
215 
216     if (Length <= TargetDesc->Buffer.Length)
217     {
218         /* Clear existing buffer and copy in the new one */
219 
220         memset (TargetDesc->Buffer.Pointer, 0, TargetDesc->Buffer.Length);
221         memcpy (TargetDesc->Buffer.Pointer, Buffer, Length);
222 
223 #ifdef ACPI_OBSOLETE_BEHAVIOR
224         /*
225          * NOTE: ACPI versions up to 3.0 specified that the buffer must be
226          * truncated if the string is smaller than the buffer. However, "other"
227          * implementations of ACPI never did this and thus became the defacto
228          * standard. ACPI 3.0A changes this behavior such that the buffer
229          * is no longer truncated.
230          */
231 
232         /*
233          * OBSOLETE BEHAVIOR:
234          * If the original source was a string, we must truncate the buffer,
235          * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer
236          * copy must not truncate the original buffer.
237          */
238         if (OriginalSrcType == ACPI_TYPE_STRING)
239         {
240             /* Set the new length of the target */
241 
242             TargetDesc->Buffer.Length = Length;
243         }
244 #endif
245     }
246     else
247     {
248         /* Truncate the source, copy only what will fit */
249 
250         memcpy (TargetDesc->Buffer.Pointer, Buffer,
251             TargetDesc->Buffer.Length);
252 
253         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
254             "Truncating source buffer from %X to %X\n",
255             Length, TargetDesc->Buffer.Length));
256     }
257 
258     /* Copy flags */
259 
260     TargetDesc->Buffer.Flags = SourceDesc->Buffer.Flags;
261     TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER;
262     return_ACPI_STATUS (AE_OK);
263 }
264 
265 
266 /*******************************************************************************
267  *
268  * FUNCTION:    AcpiExStoreStringToString
269  *
270  * PARAMETERS:  SourceDesc          - Source object to copy
271  *              TargetDesc          - Destination object of the copy
272  *
273  * RETURN:      Status
274  *
275  * DESCRIPTION: Copy a String object to another String object
276  *
277  ******************************************************************************/
278 
279 ACPI_STATUS
280 AcpiExStoreStringToString (
281     ACPI_OPERAND_OBJECT     *SourceDesc,
282     ACPI_OPERAND_OBJECT     *TargetDesc)
283 {
284     UINT32                  Length;
285     UINT8                   *Buffer;
286 
287 
288     ACPI_FUNCTION_TRACE_PTR (ExStoreStringToString, SourceDesc);
289 
290 
291     /* If Source and Target are the same, just return */
292 
293     if (SourceDesc == TargetDesc)
294     {
295         return_ACPI_STATUS (AE_OK);
296     }
297 
298     /* We know that SourceDesc is a string by now */
299 
300     Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->String.Pointer);
301     Length = SourceDesc->String.Length;
302 
303     /*
304      * Replace existing string value if it will fit and the string
305      * pointer is not a static pointer (part of an ACPI table)
306      */
307     if ((Length < TargetDesc->String.Length) &&
308        (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER)))
309     {
310         /*
311          * String will fit in existing non-static buffer.
312          * Clear old string and copy in the new one
313          */
314         memset (TargetDesc->String.Pointer, 0,
315             (ACPI_SIZE) TargetDesc->String.Length + 1);
316         memcpy (TargetDesc->String.Pointer, Buffer, Length);
317     }
318     else
319     {
320         /*
321          * Free the current buffer, then allocate a new buffer
322          * large enough to hold the value
323          */
324         if (TargetDesc->String.Pointer &&
325            (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER)))
326         {
327             /* Only free if not a pointer into the DSDT */
328 
329             ACPI_FREE (TargetDesc->String.Pointer);
330         }
331 
332         TargetDesc->String.Pointer =
333             ACPI_ALLOCATE_ZEROED ((ACPI_SIZE) Length + 1);
334 
335         if (!TargetDesc->String.Pointer)
336         {
337             return_ACPI_STATUS (AE_NO_MEMORY);
338         }
339 
340         TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER;
341         memcpy (TargetDesc->String.Pointer, Buffer, Length);
342     }
343 
344     /* Set the new target length */
345 
346     TargetDesc->String.Length = Length;
347     return_ACPI_STATUS (AE_OK);
348 }
349