dtexpress.c revision 281075 
1/******************************************************************************
2 *
3 * Module Name: dtexpress.c - Support for integer expressions and labels
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2015, 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 <contrib/dev/acpica/compiler/aslcompiler.h>
45#include <contrib/dev/acpica/compiler/dtcompiler.h>
46#include "dtparser.y.h"
47
48#define _COMPONENT          DT_COMPILER
49        ACPI_MODULE_NAME    ("dtexpress")
50
51
52/* Local prototypes */
53
54static void
55DtInsertLabelField (
56    DT_FIELD                *Field);
57
58static DT_FIELD *
59DtLookupLabel (
60    char                    *Name);
61
62/* Global used for errors during parse and related functions */
63
64DT_FIELD                *Gbl_CurrentField;
65
66
67/******************************************************************************
68 *
69 * FUNCTION:    DtResolveIntegerExpression
70 *
71 * PARAMETERS:  Field               - Field object with Integer expression
72 *              ReturnValue         - Where the integer is returned
73 *
74 * RETURN:      Status, and the resolved 64-bit integer value
75 *
76 * DESCRIPTION: Resolve an integer expression to a single value. Supports
77 *              both integer constants and labels.
78 *
79 *****************************************************************************/
80
81ACPI_STATUS
82DtResolveIntegerExpression (
83    DT_FIELD                *Field,
84    UINT64                  *ReturnValue)
85{
86    UINT64                  Result;
87
88
89    DbgPrint (ASL_DEBUG_OUTPUT, "Full Integer expression: %s\n",
90        Field->Value);
91
92    Gbl_CurrentField = Field;
93
94    Result = DtEvaluateExpression (Field->Value);
95    *ReturnValue = Result;
96    return (AE_OK);
97}
98
99
100/******************************************************************************
101 *
102 * FUNCTION:    DtDoOperator
103 *
104 * PARAMETERS:  LeftValue           - First 64-bit operand
105 *              Operator            - Parse token for the operator (EXPOP_*)
106 *              RightValue          - Second 64-bit operand
107 *
108 * RETURN:      64-bit result of the requested operation
109 *
110 * DESCRIPTION: Perform the various 64-bit integer math functions
111 *
112 *****************************************************************************/
113
114UINT64
115DtDoOperator (
116    UINT64                  LeftValue,
117    UINT32                  Operator,
118    UINT64                  RightValue)
119{
120    UINT64                  Result;
121
122
123    /* Perform the requested operation */
124
125    switch (Operator)
126    {
127    case EXPOP_ONES_COMPLIMENT:
128
129        Result = ~RightValue;
130        break;
131
132    case EXPOP_LOGICAL_NOT:
133
134        Result = !RightValue;
135        break;
136
137    case EXPOP_MULTIPLY:
138
139        Result = LeftValue * RightValue;
140        break;
141
142    case EXPOP_DIVIDE:
143
144        if (!RightValue)
145        {
146            DtError (ASL_ERROR, ASL_MSG_DIVIDE_BY_ZERO,
147                Gbl_CurrentField, NULL);
148            return (0);
149        }
150        Result = LeftValue / RightValue;
151        break;
152
153    case EXPOP_MODULO:
154
155        if (!RightValue)
156        {
157            DtError (ASL_ERROR, ASL_MSG_DIVIDE_BY_ZERO,
158                Gbl_CurrentField, NULL);
159            return (0);
160        }
161        Result = LeftValue % RightValue;
162        break;
163
164    case EXPOP_ADD:
165        Result = LeftValue + RightValue;
166        break;
167
168    case EXPOP_SUBTRACT:
169
170        Result = LeftValue - RightValue;
171        break;
172
173    case EXPOP_SHIFT_RIGHT:
174
175        Result = LeftValue >> RightValue;
176        break;
177
178    case EXPOP_SHIFT_LEFT:
179
180        Result = LeftValue << RightValue;
181        break;
182
183    case EXPOP_LESS:
184
185        Result = LeftValue < RightValue;
186        break;
187
188    case EXPOP_GREATER:
189
190        Result = LeftValue > RightValue;
191        break;
192
193    case EXPOP_LESS_EQUAL:
194
195        Result = LeftValue <= RightValue;
196        break;
197
198    case EXPOP_GREATER_EQUAL:
199
200        Result = LeftValue >= RightValue;
201        break;
202
203    case EXPOP_EQUAL:
204
205        Result = LeftValue == RightValue;
206        break;
207
208    case EXPOP_NOT_EQUAL:
209
210        Result = LeftValue != RightValue;
211        break;
212
213    case EXPOP_AND:
214
215        Result = LeftValue & RightValue;
216        break;
217
218    case EXPOP_XOR:
219
220        Result = LeftValue ^ RightValue;
221        break;
222
223    case EXPOP_OR:
224
225        Result = LeftValue | RightValue;
226        break;
227
228    case EXPOP_LOGICAL_AND:
229
230        Result = LeftValue && RightValue;
231        break;
232
233    case EXPOP_LOGICAL_OR:
234
235        Result = LeftValue || RightValue;
236        break;
237
238   default:
239
240        /* Unknown operator */
241
242        DtFatal (ASL_MSG_INVALID_EXPRESSION,
243            Gbl_CurrentField, NULL);
244        return (0);
245    }
246
247    DbgPrint (ASL_DEBUG_OUTPUT,
248        "IntegerEval: (%8.8X%8.8X %s %8.8X%8.8X) = %8.8X%8.8X\n",
249        ACPI_FORMAT_UINT64 (LeftValue),
250        DtGetOpName (Operator),
251        ACPI_FORMAT_UINT64 (RightValue),
252        ACPI_FORMAT_UINT64 (Result));
253
254    return (Result);
255}
256
257
258/******************************************************************************
259 *
260 * FUNCTION:    DtResolveLabel
261 *
262 * PARAMETERS:  LabelString         - Contains the label
263 *
264 * RETURN:      Table offset associated with the label
265 *
266 * DESCRIPTION: Lookup a lable and return its value.
267 *
268 *****************************************************************************/
269
270UINT64
271DtResolveLabel (
272    char                    *LabelString)
273{
274    DT_FIELD                *LabelField;
275
276
277    DbgPrint (ASL_DEBUG_OUTPUT, "Resolve Label: %s\n", LabelString);
278
279    /* Resolve a label reference to an integer (table offset) */
280
281    if (*LabelString != '$')
282    {
283        return (0);
284    }
285
286    LabelField = DtLookupLabel (LabelString);
287    if (!LabelField)
288    {
289        DtError (ASL_ERROR, ASL_MSG_UNKNOWN_LABEL,
290            Gbl_CurrentField, LabelString);
291        return (0);
292    }
293
294    /* All we need from the label is the offset in the table */
295
296    DbgPrint (ASL_DEBUG_OUTPUT, "Resolved Label: 0x%8.8X\n",
297        LabelField->TableOffset);
298
299    return (LabelField->TableOffset);
300}
301
302
303/******************************************************************************
304 *
305 * FUNCTION:    DtDetectAllLabels
306 *
307 * PARAMETERS:  FieldList           - Field object at start of generic list
308 *
309 * RETURN:      None
310 *
311 * DESCRIPTION: Detect all labels in a list of "generic" opcodes (such as
312 *              a UEFI table.) and insert them into the global label list.
313 *
314 *****************************************************************************/
315
316void
317DtDetectAllLabels (
318    DT_FIELD                *FieldList)
319{
320    ACPI_DMTABLE_INFO       *Info;
321    DT_FIELD                *GenericField;
322    UINT32                  TableOffset;
323
324
325    TableOffset = Gbl_CurrentTableOffset;
326    GenericField = FieldList;
327
328    /*
329     * Process all "Label:" fields within the parse tree. We need
330     * to know the offsets for all labels before we can compile
331     * the parse tree in order to handle forward references. Traverse
332     * tree and get/set all field lengths of all operators in order to
333     * determine the label offsets.
334     */
335    while (GenericField)
336    {
337        Info = DtGetGenericTableInfo (GenericField->Name);
338        if (Info)
339        {
340            /* Maintain table offsets */
341
342            GenericField->TableOffset = TableOffset;
343            TableOffset += DtGetFieldLength (GenericField, Info);
344
345            /* Insert all labels in the global label list */
346
347            if (Info->Opcode == ACPI_DMT_LABEL)
348            {
349                DtInsertLabelField (GenericField);
350            }
351        }
352
353        GenericField = GenericField->Next;
354    }
355}
356
357
358/******************************************************************************
359 *
360 * FUNCTION:    DtInsertLabelField
361 *
362 * PARAMETERS:  Field               - Field object with Label to be inserted
363 *
364 * RETURN:      None
365 *
366 * DESCRIPTION: Insert a label field into the global label list
367 *
368 *****************************************************************************/
369
370static void
371DtInsertLabelField (
372    DT_FIELD                *Field)
373{
374
375    DbgPrint (ASL_DEBUG_OUTPUT,
376        "DtInsertLabelField: Found Label : %s at output table offset %X\n",
377        Field->Value, Field->TableOffset);
378
379    Field->NextLabel = Gbl_LabelList;
380    Gbl_LabelList = Field;
381}
382
383
384/******************************************************************************
385 *
386 * FUNCTION:    DtLookupLabel
387 *
388 * PARAMETERS:  Name                - Label to be resolved
389 *
390 * RETURN:      Field object associated with the label
391 *
392 * DESCRIPTION: Lookup a label in the global label list. Used during the
393 *              resolution of integer expressions.
394 *
395 *****************************************************************************/
396
397static DT_FIELD *
398DtLookupLabel (
399    char                    *Name)
400{
401    DT_FIELD                *LabelField;
402
403
404    /* Skip a leading $ */
405
406    if (*Name == '$')
407    {
408        Name++;
409    }
410
411    /* Search global list */
412
413    LabelField = Gbl_LabelList;
414    while (LabelField)
415    {
416        if (!ACPI_STRCMP (Name, LabelField->Value))
417        {
418            return (LabelField);
419        }
420        LabelField = LabelField->NextLabel;
421    }
422
423    return (NULL);
424}
425