/**********************************************************************
* regm_pass1.c
* Break the pcode data into sections
*
* Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
**********************************************************************/
/**********************************************************************
* Included Files
**********************************************************************/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "keywords.h"
#include "podefs.h"
#include "pedefs.h"
#include "paslib.h"
#include "pofflib.h"
#include "pinsn.h"
#include "pinsn32.h"
#include "perr.h"
#include "regm.h"
#include "regm_tree.h"
#include "regm_pass1.h"
/**********************************************************************
* Private Function Prototypes
**********************************************************************/
static void regm_Pass1Child(poffHandle_t hPoff,
struct procdata_s *pParent,
uint32_t dwStartOffset,
uint32_t dwEndOffset);
static void regm_Pass1Peer(poffHandle_t hPoff,
struct procdata_s *pPeer,
uint32_t dwStartOffset,
uint32_t dwEndOffset);
static struct procdata_s *regm_Pass1Node(poffHandle_t hPoff,
uint32_t dwStartOffset,
uint32_t pdwEndOffset,
uint8_t chTerminator);
static uint32_t regm_CheckSection1(poffHandle_t hPoff, uint32_t dwOffset);
static void regm_Pass1Family(poffHandle_t hPoff,
struct procdata_s *pNode,
uint32_t dwEndOffset);
/**********************************************************************
* Global Variables
**********************************************************************/
/**********************************************************************
* Private Variables
**********************************************************************/
/**********************************************************************
* Private Functions
**********************************************************************/
/***********************************************************************/
static void regm_Pass1Child(poffHandle_t hPoff, struct procdata_s *pParent,
uint32_t dwStartOffset, uint32_t dwEndOffset)
{
struct procdata_s *pNode;
TRACE(stderr, "[regm_Pass1Child]");
/* Read the proc/func body */
pNode = regm_Pass1Node(hPoff, dwStartOffset, dwEndOffset, oRET);
/* Put the func/proc body section into the tree */
regm_AddProgChild(pParent, pNode);
/* Handle nested and child proc/func blocks */
regm_Pass1Family(hPoff, pNode, dwEndOffset);
}
/***********************************************************************/
static void regm_Pass1Peer(poffHandle_t hPoff, struct procdata_s *pPeer,
uint32_t dwStartOffset, uint32_t dwEndOffset)
{
struct procdata_s *pNode;
TRACE(stderr, "[regm_Pass1Peer]");
/* Read the proc/func body */
pNode = regm_Pass1Node(hPoff, dwStartOffset, dwEndOffset, oRET);
/* Put the func/proc body section into the tree */
regm_AddProgPeer(pPeer, pNode);
/* Handle nested and child proc/func blocks */
regm_Pass1Family(hPoff, pNode, dwEndOffset);
}
/***********************************************************************/
static struct procdata_s *regm_Pass1Node(poffHandle_t hPoff,
uint32_t dwStartOffset,
uint32_t pdwEndOffset,
uint8_t chTerminator)
{
struct procdata_s *pNode;
uint32_t dwActualEndOffset;
TRACE(stderr, "[regm_Pass1Node]");
/* Create a container for the proc/func body, and read the data */
pNode = regm_CreateProgSection();
/* Check if there is a jump at the beginning of the segment */
pNode->section[0].dwOffset = dwStartOffset;
pNode->section[1].dwOffset = regm_CheckSection1(hPoff, dwStartOffset);
/* Read all of the p-codes associated with the node */
dwActualEndOffset = regm_ReadNodePCodes(pNode, hPoff,
pNode->section[1].dwOffset,
pdwEndOffset, chTerminator);
/* Now calculate the size of each part of the program section */
pNode->section[1].dwSize = dwActualEndOffset - pNode->section[1].dwOffset;
if (pNode->section[0].dwOffset == pNode->section[1].dwOffset)
pNode->section[0].dwSize = 0;
else
pNode->section[0].dwSize = 5;
/* Associate debug info with the program section. */
pNode->pFuncInfo = poffFindDebugFuncInfo(pNode->section[0].dwOffset);
if (!pNode->pFuncInfo)
{
/* This debug information should always be present at this
* point. We will need it.
*/
fatal(ePOFFCONFUSION);
}
return pNode;
}
/***********************************************************************/
static uint32_t regm_CheckSection1 (poffHandle_t hPoff, uint32_t dwOffset)
{
OPTYPE op;
/* Seek to the beginning of the section. */
regm_ProgSeek(hPoff, dwOffset);
/* Read the opcode at that position. */
(void)insn_GetOpCode(hPoff, &op);
/* Is it a oJMP instruction? This happens when there are nested
* functions. The entry point into the parent function is a jump
* around the nested functions.
*/
if (GETOP(&op) == oJMP)
{
/* Yes, then the block really begins at the target of the jump */
return GETARG(&op);
}
else
{
/* No, then the block really begins right here */
return dwOffset;
}
}
/***********************************************************************/
static void regm_Pass1Family(poffHandle_t hPoff, struct procdata_s *pNode,
uint32_t dwEndOffset)
{
uint32_t dwSectionEnd;
/* Process any nested functions */
if (pNode->section[0].dwOffset != pNode->section[1].dwOffset)
{
dwSectionEnd = pNode->section[0].dwOffset + pNode->section[0].dwSize;
regm_Pass1Child(hPoff, pNode, dwSectionEnd, pNode->section[1].dwOffset);
}
/* Process any peer functions */
dwSectionEnd = pNode->section[1].dwOffset + pNode->section[1].dwSize;
if (dwSectionEnd < dwEndOffset)
{
regm_Pass1Peer(hPoff, pNode, dwSectionEnd, dwEndOffset);
}
}
/**********************************************************************
* Global Functions
**********************************************************************/
/***********************************************************************/
void regm_Pass1(poffHandle_t hPoff)
{
struct procdata_s *pNode;
uint32_t dwEntryPoint;
TRACE(stderr, "[regm_Pass1]");
/* Get the program entry point from the poff header */
dwEntryPoint = poffGetEntryPoint(hPoff);
/* Read the main program body */
pNode = regm_Pass1Node(hPoff, dwEntryPoint, 0xffffffff, oEND);
/* Put the main program section into the tree (at the root) */
regm_SetProgRoot(pNode);
/* Then process any nested functions */
if (dwEntryPoint != 0)
{
regm_Pass1Child(hPoff, pNode, 0, dwEntryPoint);
}
}
/***********************************************************************/
