dtexpress.c revision 229989 
1/******************************************************************************
2 *
3 * Module Name: dtexpress.c - Support for integer expressions and labels
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2012, 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#define __DTEXPRESS_C__
45
46#include <contrib/dev/acpica/compiler/aslcompiler.h>
47#include <contrib/dev/acpica/compiler/dtcompiler.h>
48#include "dtparser.y.h"
49
50#define _COMPONENT          DT_COMPILER
51        ACPI_MODULE_NAME    ("dtexpress")
52
53
54/* Local prototypes */
55
56static void
57DtInsertLabelField (
58    DT_FIELD                *Field);
59
60static DT_FIELD *
61DtLookupLabel (
62    char                    *Name);
63
64/* Global used for errors during parse and related functions */
65
66DT_FIELD                *Gbl_CurrentField;
67
68
69/******************************************************************************
70 *
71 * FUNCTION:    DtResolveIntegerExpression
72 *
73 * PARAMETERS:  Field               - Field object with Integer expression
74 *              ReturnValue         - Where the integer is returned
75 *
76 * RETURN:      Status, and the resolved 64-bit integer value
77 *
78 * DESCRIPTION: Resolve an integer expression to a single value. Supports
79 *              both integer constants and labels.
80 *
81 *****************************************************************************/
82
83ACPI_STATUS
84DtResolveIntegerExpression (
85    DT_FIELD                *Field,
86    UINT64                  *ReturnValue)
87{
88    UINT64                  Result;
89
90
91    DbgPrint (ASL_DEBUG_OUTPUT, "Full Integer expression: %s\n",
92        Field->Value);
93
94    Gbl_CurrentField = Field;
95
96    Result = DtEvaluateExpression (Field->Value);
97    *ReturnValue = Result;
98    return (AE_OK);
99}
100
101
102/******************************************************************************
103 *
104 * FUNCTION:    DtDoOperator
105 *
106 * PARAMETERS:  LeftValue           - First 64-bit operand
107 *              Operator            - Parse token for the operator (EXPOP_*)
108 *              RightValue          - Second 64-bit operand
109 *
110 * RETURN:      64-bit result of the requested operation
111 *
112 * DESCRIPTION: Perform the various 64-bit integer math functions
113 *
114 *****************************************************************************/
115
116UINT64
117DtDoOperator (
118    UINT64                  LeftValue,
119    UINT32                  Operator,
120    UINT64                  RightValue)
121{
122    UINT64                  Result;
123
124
125    /* Perform the requested operation */
126
127    switch (Operator)
128    {
129    case EXPOP_ONES_COMPLIMENT:
130        Result = ~RightValue;
131        break;
132
133    case EXPOP_LOGICAL_NOT:
134        Result = !RightValue;
135        break;
136
137    case EXPOP_MULTIPLY:
138        Result = LeftValue * RightValue;
139        break;
140
141    case EXPOP_DIVIDE:
142        if (!RightValue)
143        {
144            DtError (ASL_ERROR, ASL_MSG_DIVIDE_BY_ZERO,
145                Gbl_CurrentField, Gbl_CurrentField->Value);
146            return (0);
147        }
148        Result = LeftValue / RightValue;
149        break;
150
151    case EXPOP_MODULO:
152        if (!RightValue)
153        {
154            DtError (ASL_ERROR, ASL_MSG_DIVIDE_BY_ZERO,
155                Gbl_CurrentField, Gbl_CurrentField->Value);
156            return (0);
157        }
158        Result = LeftValue % RightValue;
159        break;
160
161    case EXPOP_ADD:
162        Result = LeftValue + RightValue;
163        break;
164
165    case EXPOP_SUBTRACT:
166        Result = LeftValue - RightValue;
167        break;
168
169    case EXPOP_SHIFT_RIGHT:
170        Result = LeftValue >> RightValue;
171        break;
172
173    case EXPOP_SHIFT_LEFT:
174        Result = LeftValue << RightValue;
175        break;
176
177    case EXPOP_LESS:
178        Result = LeftValue < RightValue;
179        break;
180
181    case EXPOP_GREATER:
182        Result = LeftValue > RightValue;
183        break;
184
185    case EXPOP_LESS_EQUAL:
186        Result = LeftValue <= RightValue;
187        break;
188
189    case EXPOP_GREATER_EQUAL:
190        Result = LeftValue >= RightValue;
191        break;
192
193    case EXPOP_EQUAL:
194        Result = LeftValue = RightValue;
195        break;
196
197    case EXPOP_NOT_EQUAL:
198        Result = LeftValue != RightValue;
199        break;
200
201    case EXPOP_AND:
202        Result = LeftValue & RightValue;
203        break;
204
205    case EXPOP_XOR:
206        Result = LeftValue ^ RightValue;
207        break;
208
209    case EXPOP_OR:
210        Result = LeftValue | RightValue;
211        break;
212
213    case EXPOP_LOGICAL_AND:
214        Result = LeftValue && RightValue;
215        break;
216
217    case EXPOP_LOGICAL_OR:
218        Result = LeftValue || RightValue;
219        break;
220
221   default:
222
223        /* Unknown operator */
224
225        DtFatal (ASL_MSG_INVALID_EXPRESSION,
226            Gbl_CurrentField, Gbl_CurrentField->Value);
227        return (0);
228    }
229
230    DbgPrint (ASL_DEBUG_OUTPUT,
231        "IntegerEval: %s (%8.8X%8.8X %s %8.8X%8.8X) = %8.8X%8.8X\n",
232        Gbl_CurrentField->Value,
233        ACPI_FORMAT_UINT64 (LeftValue),
234        DtGetOpName (Operator),
235        ACPI_FORMAT_UINT64 (RightValue),
236        ACPI_FORMAT_UINT64 (Result));
237
238    return (Result);
239}
240
241
242/******************************************************************************
243 *
244 * FUNCTION:    DtResolveLabel
245 *
246 * PARAMETERS:  LabelString         - Contains the label
247 *
248 * RETURN:      Table offset associated with the label
249 *
250 * DESCRIPTION: Lookup a lable and return its value.
251 *
252 *****************************************************************************/
253
254UINT64
255DtResolveLabel (
256    char                    *LabelString)
257{
258    DT_FIELD                *LabelField;
259
260
261    DbgPrint (ASL_DEBUG_OUTPUT, "Resolve Label: %s\n", LabelString);
262
263    /* Resolve a label reference to an integer (table offset) */
264
265    if (*LabelString != '$')
266    {
267        return (0);
268    }
269
270    LabelField = DtLookupLabel (LabelString);
271    if (!LabelField)
272    {
273        DtError (ASL_ERROR, ASL_MSG_UNKNOWN_LABEL,
274            Gbl_CurrentField, LabelString);
275        return (0);
276    }
277
278    /* All we need from the label is the offset in the table */
279
280    DbgPrint (ASL_DEBUG_OUTPUT, "Resolved Label: 0x%8.8X\n",
281        LabelField->TableOffset);
282
283    return (LabelField->TableOffset);
284}
285
286
287/******************************************************************************
288 *
289 * FUNCTION:    DtDetectAllLabels
290 *
291 * PARAMETERS:  FieldList           - Field object at start of generic list
292 *
293 * RETURN:      None
294 *
295 * DESCRIPTION: Detect all labels in a list of "generic" opcodes (such as
296 *              a UEFI table.) and insert them into the global label list.
297 *
298 *****************************************************************************/
299
300void
301DtDetectAllLabels (
302    DT_FIELD                *FieldList)
303{
304    ACPI_DMTABLE_INFO       *Info;
305    DT_FIELD                *GenericField;
306    UINT32                  TableOffset;
307
308
309    TableOffset = Gbl_CurrentTableOffset;
310    GenericField = FieldList;
311
312    /*
313     * Process all "Label:" fields within the parse tree. We need
314     * to know the offsets for all labels before we can compile
315     * the parse tree in order to handle forward references. Traverse
316     * tree and get/set all field lengths of all operators in order to
317     * determine the label offsets.
318     */
319    while (GenericField)
320    {
321        Info = DtGetGenericTableInfo (GenericField->Name);
322        if (Info)
323        {
324            /* Maintain table offsets */
325
326            GenericField->TableOffset = TableOffset;
327            TableOffset += DtGetFieldLength (GenericField, Info);
328
329            /* Insert all labels in the global label list */
330
331            if (Info->Opcode == ACPI_DMT_LABEL)
332            {
333                DtInsertLabelField (GenericField);
334            }
335        }
336
337        GenericField = GenericField->Next;
338    }
339}
340
341
342/******************************************************************************
343 *
344 * FUNCTION:    DtInsertLabelField
345 *
346 * PARAMETERS:  Field               - Field object with Label to be inserted
347 *
348 * RETURN:      None
349 *
350 * DESCRIPTION: Insert a label field into the global label list
351 *
352 *****************************************************************************/
353
354static void
355DtInsertLabelField (
356    DT_FIELD                *Field)
357{
358
359    DbgPrint (ASL_DEBUG_OUTPUT,
360        "DtInsertLabelField: Found Label : %s at output table offset %X\n",
361        Field->Value, Field->TableOffset);
362
363    Field->NextLabel = Gbl_LabelList;
364    Gbl_LabelList = Field;
365}
366
367
368/******************************************************************************
369 *
370 * FUNCTION:    DtLookupLabel
371 *
372 * PARAMETERS:  Name                - Label to be resolved
373 *
374 * RETURN:      Field object associated with the label
375 *
376 * DESCRIPTION: Lookup a label in the global label list. Used during the
377 *              resolution of integer expressions.
378 *
379 *****************************************************************************/
380
381static DT_FIELD *
382DtLookupLabel (
383    char                    *Name)
384{
385    DT_FIELD                *LabelField;
386
387
388    /* Skip a leading $ */
389
390    if (*Name == '$')
391    {
392        Name++;
393    }
394
395    /* Search global list */
396
397    LabelField = Gbl_LabelList;
398    while (LabelField)
399    {
400        if (!ACPI_STRCMP (Name, LabelField->Value))
401        {
402            return (LabelField);
403        }
404        LabelField = LabelField->NextLabel;
405    }
406
407    return (NULL);
408}
409