408 lines
11 KiB
C
408 lines
11 KiB
C
/******************************************************************************
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*
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* Module Name: dtexpress.c - Support for integer expressions and labels
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2013, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#define __DTEXPRESS_C__
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#include <contrib/dev/acpica/compiler/aslcompiler.h>
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#include <contrib/dev/acpica/compiler/dtcompiler.h>
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#include "dtparser.y.h"
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#define _COMPONENT DT_COMPILER
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ACPI_MODULE_NAME ("dtexpress")
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/* Local prototypes */
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static void
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DtInsertLabelField (
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DT_FIELD *Field);
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static DT_FIELD *
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DtLookupLabel (
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char *Name);
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/* Global used for errors during parse and related functions */
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DT_FIELD *Gbl_CurrentField;
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/******************************************************************************
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*
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* FUNCTION: DtResolveIntegerExpression
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*
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* PARAMETERS: Field - Field object with Integer expression
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* ReturnValue - Where the integer is returned
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*
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* RETURN: Status, and the resolved 64-bit integer value
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*
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* DESCRIPTION: Resolve an integer expression to a single value. Supports
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* both integer constants and labels.
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*
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*****************************************************************************/
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ACPI_STATUS
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DtResolveIntegerExpression (
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DT_FIELD *Field,
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UINT64 *ReturnValue)
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{
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UINT64 Result;
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DbgPrint (ASL_DEBUG_OUTPUT, "Full Integer expression: %s\n",
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Field->Value);
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Gbl_CurrentField = Field;
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Result = DtEvaluateExpression (Field->Value);
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*ReturnValue = Result;
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return (AE_OK);
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}
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/******************************************************************************
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*
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* FUNCTION: DtDoOperator
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*
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* PARAMETERS: LeftValue - First 64-bit operand
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* Operator - Parse token for the operator (EXPOP_*)
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* RightValue - Second 64-bit operand
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*
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* RETURN: 64-bit result of the requested operation
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*
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* DESCRIPTION: Perform the various 64-bit integer math functions
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*
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*****************************************************************************/
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UINT64
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DtDoOperator (
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UINT64 LeftValue,
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UINT32 Operator,
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UINT64 RightValue)
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{
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UINT64 Result;
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/* Perform the requested operation */
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switch (Operator)
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{
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case EXPOP_ONES_COMPLIMENT:
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Result = ~RightValue;
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break;
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case EXPOP_LOGICAL_NOT:
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Result = !RightValue;
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break;
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case EXPOP_MULTIPLY:
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Result = LeftValue * RightValue;
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break;
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case EXPOP_DIVIDE:
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if (!RightValue)
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{
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DtError (ASL_ERROR, ASL_MSG_DIVIDE_BY_ZERO,
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Gbl_CurrentField, NULL);
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return (0);
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}
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Result = LeftValue / RightValue;
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break;
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case EXPOP_MODULO:
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if (!RightValue)
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{
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DtError (ASL_ERROR, ASL_MSG_DIVIDE_BY_ZERO,
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Gbl_CurrentField, NULL);
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return (0);
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}
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Result = LeftValue % RightValue;
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break;
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case EXPOP_ADD:
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Result = LeftValue + RightValue;
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break;
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case EXPOP_SUBTRACT:
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Result = LeftValue - RightValue;
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break;
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case EXPOP_SHIFT_RIGHT:
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Result = LeftValue >> RightValue;
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break;
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case EXPOP_SHIFT_LEFT:
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Result = LeftValue << RightValue;
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break;
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case EXPOP_LESS:
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Result = LeftValue < RightValue;
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break;
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case EXPOP_GREATER:
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Result = LeftValue > RightValue;
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break;
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case EXPOP_LESS_EQUAL:
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Result = LeftValue <= RightValue;
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break;
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case EXPOP_GREATER_EQUAL:
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Result = LeftValue >= RightValue;
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break;
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case EXPOP_EQUAL:
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Result = LeftValue == RightValue;
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break;
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case EXPOP_NOT_EQUAL:
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Result = LeftValue != RightValue;
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break;
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case EXPOP_AND:
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Result = LeftValue & RightValue;
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break;
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case EXPOP_XOR:
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Result = LeftValue ^ RightValue;
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break;
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case EXPOP_OR:
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Result = LeftValue | RightValue;
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break;
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case EXPOP_LOGICAL_AND:
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Result = LeftValue && RightValue;
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break;
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case EXPOP_LOGICAL_OR:
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Result = LeftValue || RightValue;
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break;
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default:
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/* Unknown operator */
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DtFatal (ASL_MSG_INVALID_EXPRESSION,
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Gbl_CurrentField, NULL);
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return (0);
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}
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DbgPrint (ASL_DEBUG_OUTPUT,
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"IntegerEval: (%8.8X%8.8X %s %8.8X%8.8X) = %8.8X%8.8X\n",
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ACPI_FORMAT_UINT64 (LeftValue),
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DtGetOpName (Operator),
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ACPI_FORMAT_UINT64 (RightValue),
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ACPI_FORMAT_UINT64 (Result));
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return (Result);
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}
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/******************************************************************************
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*
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* FUNCTION: DtResolveLabel
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*
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* PARAMETERS: LabelString - Contains the label
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*
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* RETURN: Table offset associated with the label
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*
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* DESCRIPTION: Lookup a lable and return its value.
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*
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*****************************************************************************/
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UINT64
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DtResolveLabel (
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char *LabelString)
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{
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DT_FIELD *LabelField;
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DbgPrint (ASL_DEBUG_OUTPUT, "Resolve Label: %s\n", LabelString);
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/* Resolve a label reference to an integer (table offset) */
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if (*LabelString != '$')
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{
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return (0);
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}
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LabelField = DtLookupLabel (LabelString);
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if (!LabelField)
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{
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DtError (ASL_ERROR, ASL_MSG_UNKNOWN_LABEL,
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Gbl_CurrentField, LabelString);
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return (0);
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}
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/* All we need from the label is the offset in the table */
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DbgPrint (ASL_DEBUG_OUTPUT, "Resolved Label: 0x%8.8X\n",
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LabelField->TableOffset);
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return (LabelField->TableOffset);
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}
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/******************************************************************************
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*
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* FUNCTION: DtDetectAllLabels
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*
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* PARAMETERS: FieldList - Field object at start of generic list
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*
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* RETURN: None
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*
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* DESCRIPTION: Detect all labels in a list of "generic" opcodes (such as
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* a UEFI table.) and insert them into the global label list.
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*
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*****************************************************************************/
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void
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DtDetectAllLabels (
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DT_FIELD *FieldList)
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{
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ACPI_DMTABLE_INFO *Info;
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DT_FIELD *GenericField;
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UINT32 TableOffset;
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TableOffset = Gbl_CurrentTableOffset;
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GenericField = FieldList;
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/*
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* Process all "Label:" fields within the parse tree. We need
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* to know the offsets for all labels before we can compile
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* the parse tree in order to handle forward references. Traverse
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* tree and get/set all field lengths of all operators in order to
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* determine the label offsets.
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*/
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while (GenericField)
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{
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Info = DtGetGenericTableInfo (GenericField->Name);
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if (Info)
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{
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/* Maintain table offsets */
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GenericField->TableOffset = TableOffset;
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TableOffset += DtGetFieldLength (GenericField, Info);
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/* Insert all labels in the global label list */
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if (Info->Opcode == ACPI_DMT_LABEL)
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{
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DtInsertLabelField (GenericField);
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}
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}
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GenericField = GenericField->Next;
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}
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}
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/******************************************************************************
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*
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* FUNCTION: DtInsertLabelField
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*
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* PARAMETERS: Field - Field object with Label to be inserted
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*
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* RETURN: None
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*
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* DESCRIPTION: Insert a label field into the global label list
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*
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*****************************************************************************/
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static void
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DtInsertLabelField (
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DT_FIELD *Field)
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{
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DbgPrint (ASL_DEBUG_OUTPUT,
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"DtInsertLabelField: Found Label : %s at output table offset %X\n",
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Field->Value, Field->TableOffset);
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Field->NextLabel = Gbl_LabelList;
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Gbl_LabelList = Field;
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}
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/******************************************************************************
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*
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* FUNCTION: DtLookupLabel
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*
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* PARAMETERS: Name - Label to be resolved
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*
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* RETURN: Field object associated with the label
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*
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* DESCRIPTION: Lookup a label in the global label list. Used during the
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* resolution of integer expressions.
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*
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*****************************************************************************/
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static DT_FIELD *
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DtLookupLabel (
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char *Name)
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{
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DT_FIELD *LabelField;
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/* Skip a leading $ */
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if (*Name == '$')
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{
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Name++;
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}
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/* Search global list */
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LabelField = Gbl_LabelList;
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while (LabelField)
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{
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if (!ACPI_STRCMP (Name, LabelField->Value))
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{
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return (LabelField);
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}
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LabelField = LabelField->NextLabel;
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}
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return (NULL);
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}
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