129 lines
4.3 KiB
C
129 lines
4.3 KiB
C
/**********************************************************************
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* pgetopcode.c
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* P-Code access utilities
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*
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* Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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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*
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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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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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 MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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**********************************************************************/
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/**********************************************************************
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* Included Files
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**********************************************************************/
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#include <stdint.h>
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#include "keywords.h"
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#include "podefs.h"
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#include "pinsn32.h"
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#include "paslib.h"
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#include "pofflib.h"
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#include "pinsn.h"
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/**********************************************************************
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* Private Function Prototypes
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**********************************************************************/
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/**********************************************************************
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* Global Variables
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**********************************************************************/
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static int16_t g_bEndIn = 0; /* 1 = oEND pcode or EOF received */
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/**********************************************************************
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* Private Variables
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**********************************************************************/
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/**********************************************************************
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* Private Functions
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**********************************************************************/
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/**********************************************************************
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* Global Functions
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**********************************************************************/
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/**********************************************************************/
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uint32_t insn_GetOpCode(poffHandle_t handle, OPTYPE *ptr)
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{
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uint32_t opsize = 1;
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int c;
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TRACE(stderr, "[insn_GetOpCode]");
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/* If we are not already at the EOF, read the next character from
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* the input stream.
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*/
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if (!g_bEndIn)
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c = poffGetProgByte(handle);
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else
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c = EOF;
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/* Check for end of file. We may have previously parsed oEND which
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* is a 'logical' end of file for a pascal program (but not a unit)
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* or we may be at the physical end of the file wihout encountering
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* oEND (typical for a UNIT file).
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*/
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if ((g_bEndIn) || (c == EOF))
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{
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ptr->op = oEND;
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}
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else
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{
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ptr->op = c;
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g_bEndIn = (c == oEND);
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if (c & o32)
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{
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uint8_t *pb = (uint8_t*)&ptr->arg;
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pb[opB1] = poffGetProgByte(handle);
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pb[opB2] = poffGetProgByte(handle);
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pb[opB3] = poffGetProgByte(handle);
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pb[opB4] = poffGetProgByte(handle);
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opsize += 4;
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}
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}
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return opsize;
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}
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/**********************************************************************/
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void insn_ResetOpCodeRead(poffHandle_t handle)
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{
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poffResetAccess(handle);
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g_bEndIn = 0;
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}
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/***********************************************************************/
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