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px4-firmware/misc/pascal/libpoff/pfread.c

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/**********************************************************************
* pfread.c
* POFF library global variables
*
* 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 <sys/types.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "keywords.h" /* Standard types */
#include "pedefs.h" /* Pascal error definitions */
#include "perr.h" /* error() */
#include "pofflib.h" /* POFF library interface */
#include "pfprivate.h" /* POFF private definitions */
/**********************************************************************
* Pre-processor Definitions
**********************************************************************/
/**********************************************************************
* Global Variables
**********************************************************************/
/**********************************************************************
* Private Variables
**********************************************************************/
/***********************************************************************
* Private Function Prototypes
***********************************************************************/
static uint16_t poffReadFileHeader(poffHandle_t handle, FILE *poffFile);
static uint16_t poffReadSectionHeaders(poffHandle_t handle, FILE *poffFile);
static uint16_t poffReadSectionData(poffSectionHeader_t *shdr,
uint8_t **sdata, FILE *poffFile);
static uint16_t poffReadAllSectionData(poffHandle_t handle, FILE *poffFile);
/***********************************************************************
* Private Functions
***********************************************************************/
/***********************************************************************/
/* Read and verify the POFF file header */
static uint16_t poffReadFileHeader(poffHandle_t handle, FILE *poffFile)
{
poffInfo_t *poffInfo = (poffInfo_t*)handle;
size_t entriesRead;
/* Seek to the beginning of the file */
if (fseek(poffFile, 0, SEEK_SET) != 0)
{
return ePOFFREADERROR;
}
/* Read the POFF file header */
entriesRead = fread(&poffInfo->fileHeader, sizeof(poffFileHeader_t),
1, poffFile);
if (entriesRead != 1)
{
return ePOFFREADERROR;
}
/* The POFF file is retained in big-endian order. Fixup fields as necessary */
poffSwapFileHeader(&poffInfo->fileHeader);
/* Verify that this is a valid POFF header */
if ((poffInfo->fileHeader.fh_ident[FHI_MAG0] != FHI_POFF_MAG0) ||
(poffInfo->fileHeader.fh_ident[FHI_MAG1] != FHI_POFF_MAG1) ||
(poffInfo->fileHeader.fh_ident[FHI_MAG2] != FHI_POFF_MAG2) ||
(poffInfo->fileHeader.fh_ident[FHI_MAG3] != FHI_POFF_MAG3) ||
(poffInfo->fileHeader.fh_version != FHV_CURRENT))
{
return ePOFFBADFORMAT;
}
return eNOERROR;
}
/***********************************************************************/
/* Read and verify all of the POFF section headers */
static uint16_t poffReadSectionHeaders(poffHandle_t handle, FILE *poffFile)
{
poffInfo_t *poffInfo = (poffInfo_t*)handle;
poffSectionHeader_t sectionHeader;
poffSectionHeader_t *dest;
long offset;
size_t entriesRead;
int i;
offset = poffInfo->fileHeader.fh_shoff;
for (i = 0; i < poffInfo->fileHeader.fh_shnum; i++)
{
/* Seek to the beginning of the next section header */
if (fseek(poffFile, offset, SEEK_SET) != 0)
{
return ePOFFREADERROR;
}
/* Read the section header */
entriesRead = fread(&sectionHeader, sizeof(poffSectionHeader_t),
1, poffFile);
if (entriesRead != 1)
{
return ePOFFREADERROR;
}
/* The POFF file is retained in big-endian order. Fixup fields as necessary */
poffSwapSectionHeader(&sectionHeader);
/* Copy the section header to the correct location */
switch (sectionHeader.sh_type)
{
case SHT_PROGDATA : /* Program data */
if ((sectionHeader.sh_flags & SHF_EXEC) != 0)
dest = &poffInfo->progSection;
else
dest = &poffInfo->roDataSection;
break;
case SHT_SYMTAB : /* Symbol table */
dest = &poffInfo->symbolTableSection;
break;
case SHT_STRTAB : /* String table */
dest = &poffInfo->stringTableSection;
break;
case SHT_REL : /* Relocation data */
dest = &poffInfo->relocSection;
break;
case SHT_FILETAB : /* File table */
dest = &poffInfo->fileNameTableSection;
break;
case SHT_LINENO : /* Line number data */
dest = &poffInfo->lineNumberSection;
break;
case SHT_DEBUG : /* Debug function info data */
dest = &poffInfo->debugFuncSection;
break;
default:
return ePOFFREADERROR;
}
memcpy(dest, &sectionHeader, sizeof(poffSectionHeader_t));
/* Get the offset to the next section */
offset += poffInfo->fileHeader.fh_shsize;
}
return eNOERROR;
}
/***********************************************************************/
/* Read and buffer all of the POFF section data */
static uint16_t poffReadSectionData(poffSectionHeader_t *shdr,
uint8_t **sdata, FILE *poffFile)
{
size_t entriesRead;
/* Seek to the beginning of the section data */
if (fseek(poffFile, shdr->sh_offset, SEEK_SET) != 0)
{
return ePOFFREADERROR;
}
/* Allocate memory to hold the section data */
*sdata = (uint8_t*)malloc(shdr->sh_size);
if (*sdata == NULL)
{
return eNOMEMORY;
}
/* Read the section data */
entriesRead = fread(*sdata, 1, shdr->sh_size, poffFile);
if (entriesRead != shdr->sh_size)
{
return ePOFFREADERROR;
}
return eNOERROR;
}
/***********************************************************************/
/* Read and buffer all of the POFF section data */
static uint16_t poffReadAllSectionData(poffHandle_t handle, FILE *poffFile)
{
poffInfo_t *poffInfo = (poffInfo_t*)handle;
uint16_t retval = eNOERROR;
if (HAVE_PROGRAM_SECTION)
{
retval = poffReadSectionData(&poffInfo->progSection,
(uint8_t**)&poffInfo->progSectionData,
poffFile);
}
if ((retval == eNOERROR) && (HAVE_RODATA_SECTION))
{
retval = poffReadSectionData(&poffInfo->roDataSection,
(uint8_t**)&poffInfo->roDataSectionData,
poffFile);
}
if ((retval == eNOERROR) && (HAVE_SYMBOL_TABLE))
{
retval = poffReadSectionData(&poffInfo->symbolTableSection,
(uint8_t**)&poffInfo->symbolTable,
poffFile);
#ifdef CONFIG_POFF_SWAPNEEDED
if (retval == eNOERROR)
{
poffSwapSymbolTableData(poffInfo);
}
#endif
}
if ((retval == eNOERROR) && (HAVE_STRING_TABLE))
{
retval = poffReadSectionData(&poffInfo->stringTableSection,
(uint8_t**)&poffInfo->stringTable,
poffFile);
}
if ((retval == eNOERROR) && (HAVE_RELOC_SECTION))
{
retval = poffReadSectionData(&poffInfo->relocSection,
(uint8_t**)&poffInfo->relocTable,
poffFile);
#ifdef CONFIG_POFF_SWAPNEEDED
if (retval == eNOERROR)
{
poffSwapRelocationData(poffInfo);
}
#endif
}
if ((retval == eNOERROR) && (HAVE_FILE_TABLE))
{
retval = poffReadSectionData(&poffInfo->fileNameTableSection,
(uint8_t**)&poffInfo->fileNameTable,
poffFile);
#ifdef CONFIG_POFF_SWAPNEEDED
if (retval == eNOERROR)
{
poffSwapFileTableData(poffInfo);
}
#endif
}
if ((retval == eNOERROR) && (HAVE_LINE_NUMBER))
{
retval = poffReadSectionData(&poffInfo->lineNumberSection,
(uint8_t**)&poffInfo->lineNumberTable,
poffFile);
#ifdef CONFIG_POFF_SWAPNEEDED
if (retval == eNOERROR)
{
poffSwapLineNumberData(poffInfo);
}
#endif
}
if ((retval == eNOERROR) && (HAVE_DEBUG_SECTION))
{
retval = poffReadSectionData(&poffInfo->debugFuncSection,
(uint8_t**)&poffInfo->debugFuncTable,
poffFile);
#ifdef CONFIG_POFF_SWAPNEEDED
if (retval == eNOERROR)
{
poffSwapDebugData(poffInfo);
}
#endif
}
return retval;
}
/***********************************************************************
* Public Functions
***********************************************************************/
/***********************************************************************/
/* Set all global data structures to a known state */
uint16_t poffReadFile(poffHandle_t handle, FILE *poffFile)
{
uint16_t retVal;
/* Read the POFF header file */
retVal = poffReadFileHeader(handle, poffFile);
if (retVal == eNOERROR)
{
retVal = poffReadSectionHeaders(handle, poffFile);
if (retVal == eNOERROR)
{
retVal = poffReadAllSectionData(handle, poffFile);
}
}
return retVal;
}
/***********************************************************************/
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