dtexpress.c revision 245582 
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        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, NULL);
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, NULL);
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, NULL);
227        return (0);
228    }
229
230    DbgPrint (ASL_DEBUG_OUTPUT,
231        "IntegerEval: (%8.8X%8.8X %s %8.8X%8.8X) = %8.8X%8.8X\n",
232        ACPI_FORMAT_UINT64 (LeftValue),
233        DtGetOpName (Operator),
234        ACPI_FORMAT_UINT64 (RightValue),
235        ACPI_FORMAT_UINT64 (Result));
236
237    return (Result);
238}
239
240
241/******************************************************************************
242 *
243 * FUNCTION:    DtResolveLabel
244 *
245 * PARAMETERS:  LabelString         - Contains the label
246 *
247 * RETURN:      Table offset associated with the label
248 *
249 * DESCRIPTION: Lookup a lable and return its value.
250 *
251 *****************************************************************************/
252
253UINT64
254DtResolveLabel (
255    char                    *LabelString)
256{
257    DT_FIELD                *LabelField;
258
259
260    DbgPrint (ASL_DEBUG_OUTPUT, "Resolve Label: %s\n", LabelString);
261
262    /* Resolve a label reference to an integer (table offset) */
263
264    if (*LabelString != '$')
265    {
266        return (0);
267    }
268
269    LabelField = DtLookupLabel (LabelString);
270    if (!LabelField)
271    {
272        DtError (ASL_ERROR, ASL_MSG_UNKNOWN_LABEL,
273            Gbl_CurrentField, LabelString);
274        return (0);
275    }
276
277    /* All we need from the label is the offset in the table */
278
279    DbgPrint (ASL_DEBUG_OUTPUT, "Resolved Label: 0x%8.8X\n",
280        LabelField->TableOffset);
281
282    return (LabelField->TableOffset);
283}
284
285
286/******************************************************************************
287 *
288 * FUNCTION:    DtDetectAllLabels
289 *
290 * PARAMETERS:  FieldList           - Field object at start of generic list
291 *
292 * RETURN:      None
293 *
294 * DESCRIPTION: Detect all labels in a list of "generic" opcodes (such as
295 *              a UEFI table.) and insert them into the global label list.
296 *
297 *****************************************************************************/
298
299void
300DtDetectAllLabels (
301    DT_FIELD                *FieldList)
302{
303    ACPI_DMTABLE_INFO       *Info;
304    DT_FIELD                *GenericField;
305    UINT32                  TableOffset;
306
307
308    TableOffset = Gbl_CurrentTableOffset;
309    GenericField = FieldList;
310
311    /*
312     * Process all "Label:" fields within the parse tree. We need
313     * to know the offsets for all labels before we can compile
314     * the parse tree in order to handle forward references. Traverse
315     * tree and get/set all field lengths of all operators in order to
316     * determine the label offsets.
317     */
318    while (GenericField)
319    {
320        Info = DtGetGenericTableInfo (GenericField->Name);
321        if (Info)
322        {
323            /* Maintain table offsets */
324
325            GenericField->TableOffset = TableOffset;
326            TableOffset += DtGetFieldLength (GenericField, Info);
327
328            /* Insert all labels in the global label list */
329
330            if (Info->Opcode == ACPI_DMT_LABEL)
331            {
332                DtInsertLabelField (GenericField);
333            }
334        }
335
336        GenericField = GenericField->Next;
337    }
338}
339
340
341/******************************************************************************
342 *
343 * FUNCTION:    DtInsertLabelField
344 *
345 * PARAMETERS:  Field               - Field object with Label to be inserted
346 *
347 * RETURN:      None
348 *
349 * DESCRIPTION: Insert a label field into the global label list
350 *
351 *****************************************************************************/
352
353static void
354DtInsertLabelField (
355    DT_FIELD                *Field)
356{
357
358    DbgPrint (ASL_DEBUG_OUTPUT,
359        "DtInsertLabelField: Found Label : %s at output table offset %X\n",
360        Field->Value, Field->TableOffset);
361
362    Field->NextLabel = Gbl_LabelList;
363    Gbl_LabelList = Field;
364}
365
366
367/******************************************************************************
368 *
369 * FUNCTION:    DtLookupLabel
370 *
371 * PARAMETERS:  Name                - Label to be resolved
372 *
373 * RETURN:      Field object associated with the label
374 *
375 * DESCRIPTION: Lookup a label in the global label list. Used during the
376 *              resolution of integer expressions.
377 *
378 *****************************************************************************/
379
380static DT_FIELD *
381DtLookupLabel (
382    char                    *Name)
383{
384    DT_FIELD                *LabelField;
385
386
387    /* Skip a leading $ */
388
389    if (*Name == '$')
390    {
391        Name++;
392    }
393
394    /* Search global list */
395
396    LabelField = Gbl_LabelList;
397    while (LabelField)
398    {
399        if (!ACPI_STRCMP (Name, LabelField->Value))
400        {
401            return (LabelField);
402        }
403        LabelField = LabelField->NextLabel;
404    }
405
406    return (NULL);
407}
408