1 /******************************************************************************
2 *
3 * Module Name: exnames - interpreter/scanner name load/execute
4 *
5 *****************************************************************************/
6
7 /******************************************************************************
8 *
9 * 1. Copyright Notice
10 *
11 * Some or all of this work - Copyright (c) 1999 - 2018, 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 #include "amlcode.h"
156
157 #define _COMPONENT ACPI_EXECUTER
158 ACPI_MODULE_NAME ("exnames")
159
160 /* Local prototypes */
161
162 static char *
163 AcpiExAllocateNameString (
164 UINT32 PrefixCount,
165 UINT32 NumNameSegs);
166
167 static ACPI_STATUS
168 AcpiExNameSegment (
169 UINT8 **InAmlAddress,
170 char *NameString);
171
172
173 /*******************************************************************************
174 *
175 * FUNCTION: AcpiExAllocateNameString
176 *
177 * PARAMETERS: PrefixCount - Count of parent levels. Special cases:
178 * (-1)==root, 0==none
179 * NumNameSegs - count of 4-character name segments
180 *
181 * RETURN: A pointer to the allocated string segment. This segment must
182 * be deleted by the caller.
183 *
184 * DESCRIPTION: Allocate a buffer for a name string. Ensure allocated name
185 * string is long enough, and set up prefix if any.
186 *
187 ******************************************************************************/
188
189 static char *
AcpiExAllocateNameString(UINT32 PrefixCount,UINT32 NumNameSegs)190 AcpiExAllocateNameString (
191 UINT32 PrefixCount,
192 UINT32 NumNameSegs)
193 {
194 char *TempPtr;
195 char *NameString;
196 UINT32 SizeNeeded;
197
198 ACPI_FUNCTION_TRACE (ExAllocateNameString);
199
200
201 /*
202 * Allow room for all \ and ^ prefixes, all segments and a MultiNamePrefix.
203 * Also, one byte for the null terminator.
204 * This may actually be somewhat longer than needed.
205 */
206 if (PrefixCount == ACPI_UINT32_MAX)
207 {
208 /* Special case for root */
209
210 SizeNeeded = 1 + (ACPI_NAME_SIZE * NumNameSegs) + 2 + 1;
211 }
212 else
213 {
214 SizeNeeded = PrefixCount + (ACPI_NAME_SIZE * NumNameSegs) + 2 + 1;
215 }
216
217 /*
218 * Allocate a buffer for the name.
219 * This buffer must be deleted by the caller!
220 */
221 NameString = ACPI_ALLOCATE (SizeNeeded);
222 if (!NameString)
223 {
224 ACPI_ERROR ((AE_INFO,
225 "Could not allocate size %u", SizeNeeded));
226 return_PTR (NULL);
227 }
228
229 TempPtr = NameString;
230
231 /* Set up Root or Parent prefixes if needed */
232
233 if (PrefixCount == ACPI_UINT32_MAX)
234 {
235 *TempPtr++ = AML_ROOT_PREFIX;
236 }
237 else
238 {
239 while (PrefixCount--)
240 {
241 *TempPtr++ = AML_PARENT_PREFIX;
242 }
243 }
244
245
246 /* Set up Dual or Multi prefixes if needed */
247
248 if (NumNameSegs > 2)
249 {
250 /* Set up multi prefixes */
251
252 *TempPtr++ = AML_MULTI_NAME_PREFIX;
253 *TempPtr++ = (char) NumNameSegs;
254 }
255 else if (2 == NumNameSegs)
256 {
257 /* Set up dual prefixes */
258
259 *TempPtr++ = AML_DUAL_NAME_PREFIX;
260 }
261
262 /*
263 * Terminate string following prefixes. AcpiExNameSegment() will
264 * append the segment(s)
265 */
266 *TempPtr = 0;
267
268 return_PTR (NameString);
269 }
270
271
272 /*******************************************************************************
273 *
274 * FUNCTION: AcpiExNameSegment
275 *
276 * PARAMETERS: InAmlAddress - Pointer to the name in the AML code
277 * NameString - Where to return the name. The name is appended
278 * to any existing string to form a namepath
279 *
280 * RETURN: Status
281 *
282 * DESCRIPTION: Extract an ACPI name (4 bytes) from the AML byte stream
283 *
284 ******************************************************************************/
285
286 static ACPI_STATUS
AcpiExNameSegment(UINT8 ** InAmlAddress,char * NameString)287 AcpiExNameSegment (
288 UINT8 **InAmlAddress,
289 char *NameString)
290 {
291 char *AmlAddress = (void *) *InAmlAddress;
292 ACPI_STATUS Status = AE_OK;
293 UINT32 Index;
294 char CharBuf[5];
295
296
297 ACPI_FUNCTION_TRACE (ExNameSegment);
298
299
300 /*
301 * If first character is a digit, then we know that we aren't looking
302 * at a valid name segment
303 */
304 CharBuf[0] = *AmlAddress;
305
306 if ('0' <= CharBuf[0] && CharBuf[0] <= '9')
307 {
308 ACPI_ERROR ((AE_INFO, "Invalid leading digit: %c", CharBuf[0]));
309 return_ACPI_STATUS (AE_CTRL_PENDING);
310 }
311
312 for (Index = 0;
313 (Index < ACPI_NAME_SIZE) && (AcpiUtValidNameChar (*AmlAddress, 0));
314 Index++)
315 {
316 CharBuf[Index] = *AmlAddress++;
317 }
318
319
320 /* Valid name segment */
321
322 if (Index == 4)
323 {
324 /* Found 4 valid characters */
325
326 CharBuf[4] = '\0';
327
328 if (NameString)
329 {
330 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
331 "Appending NameSeg %s\n", CharBuf));
332 strcat (NameString, CharBuf);
333 }
334 else
335 {
336 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
337 "No Name string - %s\n", CharBuf));
338 }
339 }
340 else if (Index == 0)
341 {
342 /*
343 * First character was not a valid name character,
344 * so we are looking at something other than a name.
345 */
346 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
347 "Leading character is not alpha: %02Xh (not a name)\n",
348 CharBuf[0]));
349 Status = AE_CTRL_PENDING;
350 }
351 else
352 {
353 /*
354 * Segment started with one or more valid characters, but fewer than
355 * the required 4
356 */
357 Status = AE_AML_BAD_NAME;
358 ACPI_ERROR ((AE_INFO,
359 "Bad character 0x%02x in name, at %p",
360 *AmlAddress, AmlAddress));
361 }
362
363 *InAmlAddress = ACPI_CAST_PTR (UINT8, AmlAddress);
364 return_ACPI_STATUS (Status);
365 }
366
367
368 /*******************************************************************************
369 *
370 * FUNCTION: AcpiExGetNameString
371 *
372 * PARAMETERS: DataType - Object type to be associated with this
373 * name
374 * InAmlAddress - Pointer to the namestring in the AML code
375 * OutNameString - Where the namestring is returned
376 * OutNameLength - Length of the returned string
377 *
378 * RETURN: Status, namestring and length
379 *
380 * DESCRIPTION: Extract a full namepath from the AML byte stream,
381 * including any prefixes.
382 *
383 ******************************************************************************/
384
385 ACPI_STATUS
AcpiExGetNameString(ACPI_OBJECT_TYPE DataType,UINT8 * InAmlAddress,char ** OutNameString,UINT32 * OutNameLength)386 AcpiExGetNameString (
387 ACPI_OBJECT_TYPE DataType,
388 UINT8 *InAmlAddress,
389 char **OutNameString,
390 UINT32 *OutNameLength)
391 {
392 ACPI_STATUS Status = AE_OK;
393 UINT8 *AmlAddress = InAmlAddress;
394 char *NameString = NULL;
395 UINT32 NumSegments;
396 UINT32 PrefixCount = 0;
397 BOOLEAN HasPrefix = FALSE;
398
399
400 ACPI_FUNCTION_TRACE_PTR (ExGetNameString, AmlAddress);
401
402
403 if (ACPI_TYPE_LOCAL_REGION_FIELD == DataType ||
404 ACPI_TYPE_LOCAL_BANK_FIELD == DataType ||
405 ACPI_TYPE_LOCAL_INDEX_FIELD == DataType)
406 {
407 /* Disallow prefixes for types associated with FieldUnit names */
408
409 NameString = AcpiExAllocateNameString (0, 1);
410 if (!NameString)
411 {
412 Status = AE_NO_MEMORY;
413 }
414 else
415 {
416 Status = AcpiExNameSegment (&AmlAddress, NameString);
417 }
418 }
419 else
420 {
421 /*
422 * DataType is not a field name.
423 * Examine first character of name for root or parent prefix operators
424 */
425 switch (*AmlAddress)
426 {
427 case AML_ROOT_PREFIX:
428
429 ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "RootPrefix(\\) at %p\n",
430 AmlAddress));
431
432 /*
433 * Remember that we have a RootPrefix --
434 * see comment in AcpiExAllocateNameString()
435 */
436 AmlAddress++;
437 PrefixCount = ACPI_UINT32_MAX;
438 HasPrefix = TRUE;
439 break;
440
441 case AML_PARENT_PREFIX:
442
443 /* Increment past possibly multiple parent prefixes */
444
445 do
446 {
447 ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "ParentPrefix (^) at %p\n",
448 AmlAddress));
449
450 AmlAddress++;
451 PrefixCount++;
452
453 } while (*AmlAddress == AML_PARENT_PREFIX);
454
455 HasPrefix = TRUE;
456 break;
457
458 default:
459
460 /* Not a prefix character */
461
462 break;
463 }
464
465 /* Examine first character of name for name segment prefix operator */
466
467 switch (*AmlAddress)
468 {
469 case AML_DUAL_NAME_PREFIX:
470
471 ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "DualNamePrefix at %p\n",
472 AmlAddress));
473
474 AmlAddress++;
475 NameString = AcpiExAllocateNameString (PrefixCount, 2);
476 if (!NameString)
477 {
478 Status = AE_NO_MEMORY;
479 break;
480 }
481
482 /* Indicate that we processed a prefix */
483
484 HasPrefix = TRUE;
485
486 Status = AcpiExNameSegment (&AmlAddress, NameString);
487 if (ACPI_SUCCESS (Status))
488 {
489 Status = AcpiExNameSegment (&AmlAddress, NameString);
490 }
491 break;
492
493 case AML_MULTI_NAME_PREFIX:
494
495 ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "MultiNamePrefix at %p\n",
496 AmlAddress));
497
498 /* Fetch count of segments remaining in name path */
499
500 AmlAddress++;
501 NumSegments = *AmlAddress;
502
503 NameString = AcpiExAllocateNameString (
504 PrefixCount, NumSegments);
505 if (!NameString)
506 {
507 Status = AE_NO_MEMORY;
508 break;
509 }
510
511 /* Indicate that we processed a prefix */
512
513 AmlAddress++;
514 HasPrefix = TRUE;
515
516 while (NumSegments &&
517 (Status = AcpiExNameSegment (&AmlAddress, NameString)) ==
518 AE_OK)
519 {
520 NumSegments--;
521 }
522
523 break;
524
525 case 0:
526
527 /* NullName valid as of 8-12-98 ASL/AML Grammar Update */
528
529 if (PrefixCount == ACPI_UINT32_MAX)
530 {
531 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
532 "NameSeg is \"\\\" followed by NULL\n"));
533 }
534
535 /* Consume the NULL byte */
536
537 AmlAddress++;
538 NameString = AcpiExAllocateNameString (PrefixCount, 0);
539 if (!NameString)
540 {
541 Status = AE_NO_MEMORY;
542 break;
543 }
544
545 break;
546
547 default:
548
549 /* Name segment string */
550
551 NameString = AcpiExAllocateNameString (PrefixCount, 1);
552 if (!NameString)
553 {
554 Status = AE_NO_MEMORY;
555 break;
556 }
557
558 Status = AcpiExNameSegment (&AmlAddress, NameString);
559 break;
560 }
561 }
562
563 if (AE_CTRL_PENDING == Status && HasPrefix)
564 {
565 /* Ran out of segments after processing a prefix */
566
567 ACPI_ERROR ((AE_INFO,
568 "Malformed Name at %p", NameString));
569 Status = AE_AML_BAD_NAME;
570 }
571
572 if (ACPI_FAILURE (Status))
573 {
574 if (NameString)
575 {
576 ACPI_FREE (NameString);
577 }
578 return_ACPI_STATUS (Status);
579 }
580
581 *OutNameString = NameString;
582 *OutNameLength = (UINT32) (AmlAddress - InAmlAddress);
583
584 return_ACPI_STATUS (Status);
585 }
586