1 /******************************************************************************
2 *
3 * Module Name: dtexpress.c - Support for integer expressions and labels
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 "aslcompiler.h"
153 #include "dtparser.y.h"
154
155 #define _COMPONENT DT_COMPILER
156 ACPI_MODULE_NAME ("dtexpress")
157
158
159 /* Local prototypes */
160
161 static void
162 DtInsertLabelField (
163 DT_FIELD *Field);
164
165 static DT_FIELD *
166 DtLookupLabel (
167 char *Name);
168
169 /* Global used for errors during parse and related functions */
170
171 DT_FIELD *Gbl_CurrentField;
172
173
174 /******************************************************************************
175 *
176 * FUNCTION: DtResolveIntegerExpression
177 *
178 * PARAMETERS: Field - Field object with Integer expression
179 * ReturnValue - Where the integer is returned
180 *
181 * RETURN: Status, and the resolved 64-bit integer value
182 *
183 * DESCRIPTION: Resolve an integer expression to a single value. Supports
184 * both integer constants and labels.
185 *
186 *****************************************************************************/
187
188 ACPI_STATUS
DtResolveIntegerExpression(DT_FIELD * Field,UINT64 * ReturnValue)189 DtResolveIntegerExpression (
190 DT_FIELD *Field,
191 UINT64 *ReturnValue)
192 {
193 UINT64 Result;
194
195
196 DbgPrint (ASL_DEBUG_OUTPUT, "Full Integer expression: %s\n",
197 Field->Value);
198
199 Gbl_CurrentField = Field;
200
201 Result = DtEvaluateExpression (Field->Value);
202 *ReturnValue = Result;
203 return (AE_OK);
204 }
205
206
207 /******************************************************************************
208 *
209 * FUNCTION: DtDoOperator
210 *
211 * PARAMETERS: LeftValue - First 64-bit operand
212 * Operator - Parse token for the operator (OP_EXP_*)
213 * RightValue - Second 64-bit operand
214 *
215 * RETURN: 64-bit result of the requested operation
216 *
217 * DESCRIPTION: Perform the various 64-bit integer math functions
218 *
219 *****************************************************************************/
220
221 UINT64
DtDoOperator(UINT64 LeftValue,UINT32 Operator,UINT64 RightValue)222 DtDoOperator (
223 UINT64 LeftValue,
224 UINT32 Operator,
225 UINT64 RightValue)
226 {
227 UINT64 Result;
228
229
230 /* Perform the requested operation */
231
232 switch (Operator)
233 {
234 case OP_EXP_ONES_COMPLIMENT:
235
236 Result = ~RightValue;
237 break;
238
239 case OP_EXP_LOGICAL_NOT:
240
241 Result = !RightValue;
242 break;
243
244 case OP_EXP_MULTIPLY:
245
246 Result = LeftValue * RightValue;
247 break;
248
249 case OP_EXP_DIVIDE:
250
251 if (!RightValue)
252 {
253 DtError (ASL_ERROR, ASL_MSG_DIVIDE_BY_ZERO,
254 Gbl_CurrentField, NULL);
255 return (0);
256 }
257
258 Result = LeftValue / RightValue;
259 break;
260
261 case OP_EXP_MODULO:
262
263 if (!RightValue)
264 {
265 DtError (ASL_ERROR, ASL_MSG_DIVIDE_BY_ZERO,
266 Gbl_CurrentField, NULL);
267 return (0);
268 }
269
270 Result = LeftValue % RightValue;
271 break;
272
273 case OP_EXP_ADD:
274 Result = LeftValue + RightValue;
275 break;
276
277 case OP_EXP_SUBTRACT:
278
279 Result = LeftValue - RightValue;
280 break;
281
282 case OP_EXP_SHIFT_RIGHT:
283
284 Result = LeftValue >> RightValue;
285 break;
286
287 case OP_EXP_SHIFT_LEFT:
288
289 Result = LeftValue << RightValue;
290 break;
291
292 case OP_EXP_LESS:
293
294 Result = LeftValue < RightValue;
295 break;
296
297 case OP_EXP_GREATER:
298
299 Result = LeftValue > RightValue;
300 break;
301
302 case OP_EXP_LESS_EQUAL:
303
304 Result = LeftValue <= RightValue;
305 break;
306
307 case OP_EXP_GREATER_EQUAL:
308
309 Result = LeftValue >= RightValue;
310 break;
311
312 case OP_EXP_EQUAL:
313
314 Result = LeftValue == RightValue;
315 break;
316
317 case OP_EXP_NOT_EQUAL:
318
319 Result = LeftValue != RightValue;
320 break;
321
322 case OP_EXP_AND:
323
324 Result = LeftValue & RightValue;
325 break;
326
327 case OP_EXP_XOR:
328
329 Result = LeftValue ^ RightValue;
330 break;
331
332 case OP_EXP_OR:
333
334 Result = LeftValue | RightValue;
335 break;
336
337 case OP_EXP_LOGICAL_AND:
338
339 Result = LeftValue && RightValue;
340 break;
341
342 case OP_EXP_LOGICAL_OR:
343
344 Result = LeftValue || RightValue;
345 break;
346
347 default:
348
349 /* Unknown operator */
350
351 DtFatal (ASL_MSG_INVALID_EXPRESSION,
352 Gbl_CurrentField, NULL);
353 return (0);
354 }
355
356 DbgPrint (ASL_DEBUG_OUTPUT,
357 "IntegerEval: (%8.8X%8.8X %s %8.8X%8.8X) = %8.8X%8.8X\n",
358 ACPI_FORMAT_UINT64 (LeftValue),
359 DtGetOpName (Operator),
360 ACPI_FORMAT_UINT64 (RightValue),
361 ACPI_FORMAT_UINT64 (Result));
362
363 return (Result);
364 }
365
366
367 /******************************************************************************
368 *
369 * FUNCTION: DtResolveLabel
370 *
371 * PARAMETERS: LabelString - Contains the label
372 *
373 * RETURN: Table offset associated with the label
374 *
375 * DESCRIPTION: Lookup a lable and return its value.
376 *
377 *****************************************************************************/
378
379 UINT64
DtResolveLabel(char * LabelString)380 DtResolveLabel (
381 char *LabelString)
382 {
383 DT_FIELD *LabelField;
384
385
386 DbgPrint (ASL_DEBUG_OUTPUT, "Resolve Label: %s\n", LabelString);
387
388 /* Resolve a label reference to an integer (table offset) */
389
390 if (*LabelString != '$')
391 {
392 return (0);
393 }
394
395 LabelField = DtLookupLabel (LabelString);
396 if (!LabelField)
397 {
398 DtError (ASL_ERROR, ASL_MSG_UNKNOWN_LABEL,
399 Gbl_CurrentField, LabelString);
400 return (0);
401 }
402
403 /* All we need from the label is the offset in the table */
404
405 DbgPrint (ASL_DEBUG_OUTPUT, "Resolved Label: 0x%8.8X\n",
406 LabelField->TableOffset);
407
408 return (LabelField->TableOffset);
409 }
410
411
412 /******************************************************************************
413 *
414 * FUNCTION: DtDetectAllLabels
415 *
416 * PARAMETERS: FieldList - Field object at start of generic list
417 *
418 * RETURN: None
419 *
420 * DESCRIPTION: Detect all labels in a list of "generic" opcodes (such as
421 * a UEFI table.) and insert them into the global label list.
422 *
423 *****************************************************************************/
424
425 void
DtDetectAllLabels(DT_FIELD * FieldList)426 DtDetectAllLabels (
427 DT_FIELD *FieldList)
428 {
429 ACPI_DMTABLE_INFO *Info;
430 DT_FIELD *GenericField;
431 UINT32 TableOffset;
432
433
434 TableOffset = Gbl_CurrentTableOffset;
435 GenericField = FieldList;
436
437 /*
438 * Process all "Label:" fields within the parse tree. We need
439 * to know the offsets for all labels before we can compile
440 * the parse tree in order to handle forward references. Traverse
441 * tree and get/set all field lengths of all operators in order to
442 * determine the label offsets.
443 */
444 while (GenericField)
445 {
446 Info = DtGetGenericTableInfo (GenericField->Name);
447 if (Info)
448 {
449 /* Maintain table offsets */
450
451 GenericField->TableOffset = TableOffset;
452 TableOffset += DtGetFieldLength (GenericField, Info);
453
454 /* Insert all labels in the global label list */
455
456 if (Info->Opcode == ACPI_DMT_LABEL)
457 {
458 DtInsertLabelField (GenericField);
459 }
460 }
461
462 GenericField = GenericField->Next;
463 }
464 }
465
466
467 /******************************************************************************
468 *
469 * FUNCTION: DtInsertLabelField
470 *
471 * PARAMETERS: Field - Field object with Label to be inserted
472 *
473 * RETURN: None
474 *
475 * DESCRIPTION: Insert a label field into the global label list
476 *
477 *****************************************************************************/
478
479 static void
DtInsertLabelField(DT_FIELD * Field)480 DtInsertLabelField (
481 DT_FIELD *Field)
482 {
483
484 DbgPrint (ASL_DEBUG_OUTPUT,
485 "DtInsertLabelField: Found Label : %s at output table offset %X\n",
486 Field->Value, Field->TableOffset);
487
488 Field->NextLabel = Gbl_LabelList;
489 Gbl_LabelList = Field;
490 }
491
492
493 /******************************************************************************
494 *
495 * FUNCTION: DtLookupLabel
496 *
497 * PARAMETERS: Name - Label to be resolved
498 *
499 * RETURN: Field object associated with the label
500 *
501 * DESCRIPTION: Lookup a label in the global label list. Used during the
502 * resolution of integer expressions.
503 *
504 *****************************************************************************/
505
506 static DT_FIELD *
DtLookupLabel(char * Name)507 DtLookupLabel (
508 char *Name)
509 {
510 DT_FIELD *LabelField;
511
512
513 /* Skip a leading $ */
514
515 if (*Name == '$')
516 {
517 Name++;
518 }
519
520 /* Search global list */
521
522 LabelField = Gbl_LabelList;
523 while (LabelField)
524 {
525 if (!strcmp (Name, LabelField->Value))
526 {
527 return (LabelField);
528 }
529
530 LabelField = LabelField->NextLabel;
531 }
532
533 return (NULL);
534 }
535