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|
/* $Id: VBoxBs3Linker.cpp $ */
/** @file
* VirtualBox Validation Kit - Boot Sector 3 "linker".
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <iprt/types.h>
#include <iprt/assert.h>
/*********************************************************************************************************************************
* Structures and Typedefs *
*********************************************************************************************************************************/
#pragma pack(1)
typedef struct BS3BOOTSECTOR
{
uint8_t abJmp[3];
char abOemId[8];
/** @name EBPB, DOS 4.0 style.
* @{ */
uint16_t cBytesPerSector; /**< 00bh */
uint8_t cSectorsPerCluster; /**< 00dh */
uint16_t cReservedSectors; /**< 00eh */
uint8_t cFATs; /**< 010h */
uint16_t cRootDirEntries; /**< 011h */
uint16_t cTotalSectors; /**< 013h */
uint8_t bMediaDescriptor; /**< 015h */
uint16_t cSectorsPerFAT; /**< 016h */
uint16_t cPhysSectorsPerTrack; /**< 018h */
uint16_t cHeads; /**< 01ah */
uint32_t cHiddentSectors; /**< 01ch */
uint32_t cLargeTotalSectors; /**< 020h - We (ab)use this to indicate the number of sectors to load. */
uint8_t bBootDrv; /**< 024h */
uint8_t bFlagsEtc; /**< 025h */
uint8_t bExtendedSignature; /**< 026h */
uint32_t dwSerialNumber; /**< 027h */
char abLabel[11]; /**< 02bh */
char abFSType[8]; /**< 036h */
/** @} */
} BS3BOOTSECTOR;
#pragma pack()
typedef BS3BOOTSECTOR *PBS3BOOTSECTOR;
AssertCompileMemberOffset(BS3BOOTSECTOR, cLargeTotalSectors, 0x20);
AssertCompileMemberOffset(BS3BOOTSECTOR, abLabel, 0x2b);
AssertCompileMemberOffset(BS3BOOTSECTOR, abFSType, 0x36);
#define BS3_OEMID "BS3Kit\n\n"
#define BS3_FSTYPE "RawCode\n"
#define BS3_LABEL "VirtualBox\n"
#define BS3_MAX_SIZE UINT32_C(491520) /* 480KB */
int main(int argc, char **argv)
{
const char *pszOutput = NULL;
struct BS3LNKINPUT
{
const char *pszFile;
FILE *pFile;
uint32_t cbFile;
} *paInputs = (struct BS3LNKINPUT *)calloc(sizeof(paInputs[0]), argc);
unsigned cInputs = 0;
uint32_t cSectors = 0;
/*
* Scan the arguments.
*/
for (int i = 1; i < argc; i++)
{
if (argv[i][0] == '-')
{
const char *pszOpt = &argv[i][1];
if (*pszOpt == '-')
{
/* Convert long options to short ones. */
pszOpt--;
if (!strcmp(pszOpt, "--output"))
pszOpt = "o";
else if (!strcmp(pszOpt, "--version"))
pszOpt = "V";
else if (!strcmp(pszOpt, "--help"))
pszOpt = "h";
else
{
fprintf(stderr, "syntax errro: Unknown options '%s'\n", pszOpt);
free(paInputs);
return 2;
}
}
/* Process the list of short options. */
while (*pszOpt)
{
switch (*pszOpt++)
{
case 'o':
{
const char *pszValue = pszOpt;
pszOpt = strchr(pszOpt, '\0');
if (*pszValue == '=')
pszValue++;
else if (!*pszValue)
{
if (i + 1 >= argc)
{
fprintf(stderr, "syntax error: The --output option expects a filename.\n");
free(paInputs);
return 12;
}
pszValue = argv[++i];
}
if (pszOutput)
{
fprintf(stderr, "Only one output file is allowed. You've specified '%s' and '%s'\n",
pszOutput, pszValue);
free(paInputs);
return 2;
}
pszOutput = pszValue;
pszOpt = "";
break;
}
case 'V':
printf("%s\n", "$Revision: 155244 $");
free(paInputs);
return 0;
case '?':
case 'h':
printf("usage: %s [options] -o <output> <input1> [input2 ... [inputN]]\n",
argv[0]);
free(paInputs);
return 0;
}
}
}
else
{
/*
* Add to input file collection.
*/
paInputs[cInputs].pszFile = argv[i];
#if defined(RT_OS_OS2) || defined(RT_OS_WINDOWS)
FILE *pFile = fopen(paInputs[cInputs].pszFile, "rb");
#else
FILE *pFile = fopen(paInputs[cInputs].pszFile, "r");
#endif
if (pFile)
{
if (fseek(pFile, 0, SEEK_END) == 0)
{
paInputs[cInputs].cbFile = (uint32_t)ftell(pFile);
if (fseek(pFile, 0, SEEK_SET) == 0)
{
if (cInputs != 0 || paInputs[cInputs].cbFile == 512)
{
cSectors += RT_ALIGN_32(paInputs[cInputs].cbFile, 512) / 512;
if (cSectors <= BS3_MAX_SIZE / 512)
{
if (cSectors > 0)
{
paInputs[cInputs].pFile = pFile;
pFile = NULL;
}
else
fprintf(stderr, "error: empty input file: '%s'\n", paInputs[cInputs].pszFile);
}
else
fprintf(stderr, "error: input is too big: %u bytes, %u sectors (max %u bytes, %u sectors)\n"
"info: detected loading '%s'\n",
cSectors * 512, cSectors, BS3_MAX_SIZE, BS3_MAX_SIZE / 512,
paInputs[cInputs].pszFile);
}
else
fprintf(stderr, "error: first input file (%s) must be exactly 512 bytes\n", paInputs[cInputs].pszFile);
}
else
fprintf(stderr, "error: seeking to start of '%s' failed\n", paInputs[cInputs].pszFile);
}
else
fprintf(stderr, "error: seeking to end of '%s' failed\n", paInputs[cInputs].pszFile);
}
else
fprintf(stderr, "error: Failed to open input file '%s' for reading\n", paInputs[cInputs].pszFile);
if (pFile)
{
free(paInputs);
return 1;
}
cInputs++;
}
}
if (!pszOutput)
{
fprintf(stderr, "syntax error: No output file was specified (-o or --output).\n");
free(paInputs);
return 2;
}
if (cInputs == 0)
{
fprintf(stderr, "syntax error: No input files was specified.\n");
free(paInputs);
return 2;
}
/*
* Do the job.
*/
/* Open the output file. */
#if defined(RT_OS_OS2) || defined(RT_OS_WINDOWS)
FILE *pOutput = fopen(pszOutput, "wb");
#else
FILE *pOutput = fopen(pszOutput, "w");
#endif
if (!pOutput)
{
fprintf(stderr, "error: Failed to open output file '%s' for writing\n", pszOutput);
free(paInputs);
return 1;
}
/* Copy the input files to the output file, with sector padding applied. */
int rcExit = 0;
size_t off = 0;
for (unsigned i = 0; i < cInputs && rcExit == 0; i++)
{
uint8_t abBuf[4096]; /* Must be multiple of 512! */
uint32_t cbToRead = paInputs[i].cbFile;
while (cbToRead > 0)
{
/* Read a block from the input file. */
uint32_t const cbThisRead = RT_MIN(cbToRead, sizeof(abBuf));
size_t cbRead = fread(abBuf, sizeof(uint8_t), cbThisRead, paInputs[i].pFile);
if (cbRead != cbThisRead)
{
fprintf(stderr, "error: Error reading '%s' (got %d bytes, wanted %u).\n",
paInputs[i].pszFile, (int)cbRead, (unsigned)cbThisRead);
rcExit = 1;
break;
}
cbToRead -= cbThisRead;
/* Padd the end of the file if necessary. */
if ((cbRead & 0x1ff) != 0)
{
memset(&abBuf[cbRead], 0, 4096 - cbRead);
cbRead = (cbRead + 0x1ff) & ~0x1ffU;
}
/* Patch the BPB of the first file. */
if (off == 0)
{
PBS3BOOTSECTOR pBs = (PBS3BOOTSECTOR)&abBuf[0];
if ( memcmp(pBs->abLabel, RT_STR_TUPLE(BS3_LABEL)) == 0
&& memcmp(pBs->abFSType, RT_STR_TUPLE(BS3_FSTYPE)) == 0
&& memcmp(pBs->abOemId, RT_STR_TUPLE(BS3_OEMID)) == 0)
pBs->cLargeTotalSectors = cSectors;
else
{
fprintf(stderr, "error: Didn't find magic strings in the first file (%s).\n", paInputs[i].pszFile);
rcExit = 1;
}
}
/* Write the block to the output file. */
if (fwrite(abBuf, sizeof(uint8_t), cbRead, pOutput) == cbRead)
off += cbRead;
else
{
fprintf(stderr, "error: fwrite failed\n");
rcExit = 1;
break;
}
}
if (ferror(paInputs[i].pFile))
{
fprintf(stderr, "error: Error reading '%s'.\n", paInputs[i].pszFile);
rcExit = 1;
}
}
/* Close the input files. */
for (unsigned i = 0; i < cInputs && rcExit == 0; i++)
fclose(paInputs[i].pFile);
free(paInputs);
/* Avoid output sizes that makes the FDC code think it's a single sided
floppy. The BIOS always report double sided floppies, and even if we
the bootsector adjust it's bMaxHeads value when getting a 20h error
we end up with a garbaged image (seems somewhere in the BIOS/FDC it is
still treated as a double sided floppy and we get half the data we want
and with gaps).
Similarly, if the size is 320KB or 360KB the FDC detects it as a double
sided 5.25" floppy with 40 tracks, while the BIOS keeps reporting a
1.44MB 3.5" floppy. So, just avoid those sizes too. */
uint32_t cbOutput = ftell(pOutput);
if ( cbOutput == 512 * 8 * 40 * 1 /* 160kB 5"1/4 SS */
|| cbOutput == 512 * 9 * 40 * 1 /* 180kB 5"1/4 SS */
|| cbOutput == 512 * 8 * 40 * 2 /* 320kB 5"1/4 DS */
|| cbOutput == 512 * 9 * 40 * 2 /* 360kB 5"1/4 DS */ )
{
static uint8_t const s_abZeroSector[512] = { 0 };
if (fwrite(s_abZeroSector, sizeof(uint8_t), sizeof(s_abZeroSector), pOutput) != sizeof(s_abZeroSector))
{
fprintf(stderr, "error: fwrite failed (padding)\n");
rcExit = 1;
}
}
/* Finally, close the output file (can fail because of buffered data). */
if (fclose(pOutput) != 0)
{
fprintf(stderr, "error: Error closing '%s'.\n", pszOutput);
rcExit = 1;
}
fclose(stderr);
return rcExit;
}
|
