dtexpress.c revision 256281 
1/******************************************************************************
2 *
3 * Module Name: dtexpress.c - Support for integer expressions and labels
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2013, 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
131        Result = ~RightValue;
132        break;
133
134    case EXPOP_LOGICAL_NOT:
135
136        Result = !RightValue;
137        break;
138
139    case EXPOP_MULTIPLY:
140
141        Result = LeftValue * RightValue;
142        break;
143
144    case EXPOP_DIVIDE:
145
146        if (!RightValue)
147        {
148            DtError (ASL_ERROR, ASL_MSG_DIVIDE_BY_ZERO,
149                Gbl_CurrentField, NULL);
150            return (0);
151        }
152        Result = LeftValue / RightValue;
153        break;
154
155    case EXPOP_MODULO:
156
157        if (!RightValue)
158        {
159            DtError (ASL_ERROR, ASL_MSG_DIVIDE_BY_ZERO,
160                Gbl_CurrentField, NULL);
161            return (0);
162        }
163        Result = LeftValue % RightValue;
164        break;
165
166    case EXPOP_ADD:
167        Result = LeftValue + RightValue;
168        break;
169
170    case EXPOP_SUBTRACT:
171
172        Result = LeftValue - RightValue;
173        break;
174
175    case EXPOP_SHIFT_RIGHT:
176
177        Result = LeftValue >> RightValue;
178        break;
179
180    case EXPOP_SHIFT_LEFT:
181
182        Result = LeftValue << RightValue;
183        break;
184
185    case EXPOP_LESS:
186
187        Result = LeftValue < RightValue;
188        break;
189
190    case EXPOP_GREATER:
191
192        Result = LeftValue > RightValue;
193        break;
194
195    case EXPOP_LESS_EQUAL:
196
197        Result = LeftValue <= RightValue;
198        break;
199
200    case EXPOP_GREATER_EQUAL:
201
202        Result = LeftValue >= RightValue;
203        break;
204
205    case EXPOP_EQUAL:
206
207        Result = LeftValue == RightValue;
208        break;
209
210    case EXPOP_NOT_EQUAL:
211
212        Result = LeftValue != RightValue;
213        break;
214
215    case EXPOP_AND:
216
217        Result = LeftValue & RightValue;
218        break;
219
220    case EXPOP_XOR:
221
222        Result = LeftValue ^ RightValue;
223        break;
224
225    case EXPOP_OR:
226
227        Result = LeftValue | RightValue;
228        break;
229
230    case EXPOP_LOGICAL_AND:
231
232        Result = LeftValue && RightValue;
233        break;
234
235    case EXPOP_LOGICAL_OR:
236
237        Result = LeftValue || RightValue;
238        break;
239
240   default:
241
242        /* Unknown operator */
243
244        DtFatal (ASL_MSG_INVALID_EXPRESSION,
245            Gbl_CurrentField, NULL);
246        return (0);
247    }
248
249    DbgPrint (ASL_DEBUG_OUTPUT,
250        "IntegerEval: (%8.8X%8.8X %s %8.8X%8.8X) = %8.8X%8.8X\n",
251        ACPI_FORMAT_UINT64 (LeftValue),
252        DtGetOpName (Operator),
253        ACPI_FORMAT_UINT64 (RightValue),
254        ACPI_FORMAT_UINT64 (Result));
255
256    return (Result);
257}
258
259
260/******************************************************************************
261 *
262 * FUNCTION:    DtResolveLabel
263 *
264 * PARAMETERS:  LabelString         - Contains the label
265 *
266 * RETURN:      Table offset associated with the label
267 *
268 * DESCRIPTION: Lookup a lable and return its value.
269 *
270 *****************************************************************************/
271
272UINT64
273DtResolveLabel (
274    char                    *LabelString)
275{
276    DT_FIELD                *LabelField;
277
278
279    DbgPrint (ASL_DEBUG_OUTPUT, "Resolve Label: %s\n", LabelString);
280
281    /* Resolve a label reference to an integer (table offset) */
282
283    if (*LabelString != '$')
284    {
285        return (0);
286    }
287
288    LabelField = DtLookupLabel (LabelString);
289    if (!LabelField)
290    {
291        DtError (ASL_ERROR, ASL_MSG_UNKNOWN_LABEL,
292            Gbl_CurrentField, LabelString);
293        return (0);
294    }
295
296    /* All we need from the label is the offset in the table */
297
298    DbgPrint (ASL_DEBUG_OUTPUT, "Resolved Label: 0x%8.8X\n",
299        LabelField->TableOffset);
300
301    return (LabelField->TableOffset);
302}
303
304
305/******************************************************************************
306 *
307 * FUNCTION:    DtDetectAllLabels
308 *
309 * PARAMETERS:  FieldList           - Field object at start of generic list
310 *
311 * RETURN:      None
312 *
313 * DESCRIPTION: Detect all labels in a list of "generic" opcodes (such as
314 *              a UEFI table.) and insert them into the global label list.
315 *
316 *****************************************************************************/
317
318void
319DtDetectAllLabels (
320    DT_FIELD                *FieldList)
321{
322    ACPI_DMTABLE_INFO       *Info;
323    DT_FIELD                *GenericField;
324    UINT32                  TableOffset;
325
326
327    TableOffset = Gbl_CurrentTableOffset;
328    GenericField = FieldList;
329
330    /*
331     * Process all "Label:" fields within the parse tree. We need
332     * to know the offsets for all labels before we can compile
333     * the parse tree in order to handle forward references. Traverse
334     * tree and get/set all field lengths of all operators in order to
335     * determine the label offsets.
336     */
337    while (GenericField)
338    {
339        Info = DtGetGenericTableInfo (GenericField->Name);
340        if (Info)
341        {
342            /* Maintain table offsets */
343
344            GenericField->TableOffset = TableOffset;
345            TableOffset += DtGetFieldLength (GenericField, Info);
346
347            /* Insert all labels in the global label list */
348
349            if (Info->Opcode == ACPI_DMT_LABEL)
350            {
351                DtInsertLabelField (GenericField);
352            }
353        }
354
355        GenericField = GenericField->Next;
356    }
357}
358
359
360/******************************************************************************
361 *
362 * FUNCTION:    DtInsertLabelField
363 *
364 * PARAMETERS:  Field               - Field object with Label to be inserted
365 *
366 * RETURN:      None
367 *
368 * DESCRIPTION: Insert a label field into the global label list
369 *
370 *****************************************************************************/
371
372static void
373DtInsertLabelField (
374    DT_FIELD                *Field)
375{
376
377    DbgPrint (ASL_DEBUG_OUTPUT,
378        "DtInsertLabelField: Found Label : %s at output table offset %X\n",
379        Field->Value, Field->TableOffset);
380
381    Field->NextLabel = Gbl_LabelList;
382    Gbl_LabelList = Field;
383}
384
385
386/******************************************************************************
387 *
388 * FUNCTION:    DtLookupLabel
389 *
390 * PARAMETERS:  Name                - Label to be resolved
391 *
392 * RETURN:      Field object associated with the label
393 *
394 * DESCRIPTION: Lookup a label in the global label list. Used during the
395 *              resolution of integer expressions.
396 *
397 *****************************************************************************/
398
399static DT_FIELD *
400DtLookupLabel (
401    char                    *Name)
402{
403    DT_FIELD                *LabelField;
404
405
406    /* Skip a leading $ */
407
408    if (*Name == '$')
409    {
410        Name++;
411    }
412
413    /* Search global list */
414
415    LabelField = Gbl_LabelList;
416    while (LabelField)
417    {
418        if (!ACPI_STRCMP (Name, LabelField->Value))
419        {
420            return (LabelField);
421        }
422        LabelField = LabelField->NextLabel;
423    }
424
425    return (NULL);
426}
427