mirror of
https://github.com/FDOS/kernel.git
synced 2025-10-31 11:24:56 +01:00
a6b468389b
32RTM and BRUN45 incompatibilities fixed by Michael. ZIP drive serial numbers now work: bug fix by Lucho. Small clean-ups and optimisations by Lucho & Arkady. git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/branches/UNSTABLE@1023 6ac86273-5f31-0410-b378-82cca8765d1b
327 lines
9.7 KiB
C
327 lines
9.7 KiB
C
/****************************************************************/
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/* */
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/* exeflat.c */
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/* */
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/* EXE flattening program */
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/* */
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/* Copyright (c) 2001 */
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/* Bart E. Oldeman */
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/* All Rights Reserved */
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/* */
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/* This file is part of DOS-C. */
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/* */
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/* DOS-C is free software; you can redistribute it and/or */
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/* modify it under the terms of the GNU General Public License */
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/* as published by the Free Software Foundation; either version */
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/* 2, or (at your option) any later version. */
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/* */
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/* DOS-C is distributed in the hope that it will be useful, but */
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/* WITHOUT ANY WARRANTY; without even the implied warranty of */
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/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */
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/* the GNU General Public License for more details. */
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/* */
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/* You should have received a copy of the GNU General Public */
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/* License along with DOS-C; see the file COPYING. If not, */
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/* write to the Free Software Foundation, 675 Mass Ave, */
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/* Cambridge, MA 02139, USA. */
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/****************************************************************/
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/*
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Usage: exeflat (src.exe) (dest.sys) (relocation-factor)
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large portions copied from task.c
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*/
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/* history
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10/??/01 - Bart Oldeman
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primary release
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11/28/01 - tom ehlert
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added -UPX option to make the kernel compressable with UPX
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*/
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#include "portab.h"
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#include "exe.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#define BUFSIZE 32768u
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typedef struct {
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UWORD off, seg;
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} farptr;
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int compReloc(const void *p1, const void *p2)
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{
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farptr *r1 = (farptr *) p1;
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farptr *r2 = (farptr *) p2;
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if (r1->seg > r2->seg)
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return 1;
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if (r1->seg < r2->seg)
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return -1;
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if (r1->off > r2->off)
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return 1;
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if (r1->off < r2->off)
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return -1;
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return 0;
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}
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void usage(void)
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{
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printf("usage: exeflat (src.exe) (dest.sys) (relocation-factor)\n");
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printf
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(" -S10 - Silent relocate segment 10 (down list)\n");
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exit(1);
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}
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int main(int argc, char **argv)
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{
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exe_header header;
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int i, j;
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size_t bufsize;
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farptr *reloc;
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UWORD start_seg;
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ULONG size, to_xfer;
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UBYTE **buffers;
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UBYTE **curbuf;
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FILE *src, *dest;
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short silentSegments[20], silentcount = 0, silentdone = 0;
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int UPX = FALSE;
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/* if no arguments provided, show usage and exit */
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if (argc < 4) usage();
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/* do optional argument processing here */
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for (i = 4; i < argc; i++)
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{
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char *argptr = argv[i];
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if (argptr[0] != '-' && argptr[0] != '/')
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usage();
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argptr++;
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switch (toupper(argptr[0]))
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{
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case 'U':
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UPX = TRUE;
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break;
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case 'S':
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if (silentcount >= LENGTH(silentSegments))
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{
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printf("can't handle more then %d silent's\n",
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LENGTH(silentSegments));
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exit(1);
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}
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silentSegments[silentcount++] = (short)strtol(argptr + 1, NULL, 0);
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break;
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default:
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usage();
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}
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}
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/* arguments left :
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infile outfile relocation offset */
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if ((src = fopen(argv[1], "rb")) == NULL)
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{
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printf("Source file %s could not be opened\n", argv[1]);
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return 1;
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}
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if (fread(&header, sizeof(header), 1, src) != 1)
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{
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printf("Error reading header from %s\n", argv[1]);
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fclose(src);
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return 1;
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}
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if (header.exSignature != MAGIC)
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{
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printf("Source file %s is not a valid .EXE\n", argv[1]);
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fclose(src);
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return 1;
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}
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if ((dest = fopen(argv[2], "wb+")) == NULL)
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{
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printf("Destination file %s could not be created\n", argv[2]);
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return 1;
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}
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start_seg = (UWORD)strtol(argv[3], NULL, 0);
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if (header.exExtraBytes == 0)
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header.exExtraBytes = 0x200;
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printf("header len = %lu = 0x%lx\n", header.exHeaderSize * 16UL,
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header.exHeaderSize * 16UL);
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size =
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((DWORD) (header.exPages - 1) << 9) + header.exExtraBytes -
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header.exHeaderSize * 16UL;
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printf("image size (less header) = %lu = 0x%lx\n", size, size);
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printf("first relocation offset = %u = 0x%u\n", header.exOverlay,
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header.exOverlay);
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/* first read file into memory chunks */
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fseek(src, header.exHeaderSize * 16UL, SEEK_SET);
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buffers = malloc((size_t)((size + BUFSIZE - 1) / BUFSIZE) * sizeof(char *));
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if (buffers == NULL)
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{
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printf("Allocation error\n");
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return 1;
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}
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bufsize = BUFSIZE;
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for (to_xfer = size, curbuf = buffers; to_xfer > 0;
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to_xfer -= bufsize, curbuf++)
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{
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if (to_xfer < BUFSIZE)
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bufsize = (size_t)to_xfer;
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*curbuf = malloc(bufsize);
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if (*curbuf == NULL)
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{
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printf("Allocation error\n");
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return 1;
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}
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if (fread(*curbuf, sizeof(char), bufsize, src) != bufsize)
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{
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printf("Source file read error %ld %d\n", to_xfer, bufsize);
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return 1;
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}
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}
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if (header.exRelocTable && header.exRelocItems)
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{
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fseek(src, header.exRelocTable, SEEK_SET);
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reloc = malloc(header.exRelocItems * sizeof(farptr));
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if (reloc == NULL)
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{
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printf("Allocation error\n");
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return 1;
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}
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if (fread(reloc, sizeof(farptr), header.exRelocItems, src) !=
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header.exRelocItems)
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{
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printf("Source file read error\n");
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return 1;
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}
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fclose(src);
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qsort(reloc, header.exRelocItems, sizeof(reloc[0]), compReloc);
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for (i = 0; i < header.exRelocItems; i++)
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{
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ULONG spot = ((ULONG) reloc[i].seg << 4) + reloc[i].off;
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UBYTE *spot0 = &buffers[(size_t)(spot / BUFSIZE)][(size_t)(spot % BUFSIZE)];
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UBYTE *spot1 = &buffers[(size_t)((spot + 1) / BUFSIZE)][(size_t)((spot + 1) % BUFSIZE)];
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UWORD segment = ((UWORD) * spot1 << 8) + *spot0;
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for (j = 0; j < silentcount; j++)
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if (segment == silentSegments[j])
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{
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silentdone++;
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goto dontPrint;
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}
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printf("relocation at 0x%04x:0x%04x ->%04x\n", reloc[i].seg,
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reloc[i].off, segment);
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dontPrint:
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segment += start_seg;
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*spot0 = segment & 0xff;
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*spot1 = segment >> 8;
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}
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}
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if (UPX)
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{
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/* UPX HEADER jump $+2+size */
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static char JumpBehindCode[] = {
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/* kernel config header - 32 bytes */
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0xeb, 0x1b, /* jmp short realentry */
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'C', 'O', 'N', 'F', 'I', 'G', 32 - 2 - 6 - 2 - 3, 0, /* WORD */
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0, /* DLASortByDriveNo db 0 */
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1, /* InitDiskShowDriveAssignment db 1 */
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2, /* SkipConfigSeconds db 2 */
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0, /* ForceLBA db 0 */
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1, /* GlobalEnableLBAsupport db 1 */
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0, /* BootHarddiskSeconds */
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'n', 'u', 's', 'e', 'd', /* unused filler bytes */
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8, 7, 6, 5, 4, 3, 2, 1,
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/* real-entry: jump over the 'real' image do the trailer */
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0xe9, 0, 0 /* 100: jmp 103 */
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};
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struct x {
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char y[sizeof(JumpBehindCode) == 0x20 ? 1 : -1];
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};
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if (size >= 0xfe00u)
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{
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printf("kernel; size too large - must be <= 0xfe00\n");
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exit(1);
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}
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/* this assumes <= 0xfe00 code in kernel */
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*(short *)&JumpBehindCode[0x1e] += (short)size;
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fwrite(JumpBehindCode, 1, 0x20, dest);
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}
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/* write dest file from memory chunks */
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bufsize = BUFSIZE;
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for (to_xfer = size, curbuf = buffers; to_xfer > 0;
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to_xfer -= bufsize, curbuf++)
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{
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if (to_xfer < BUFSIZE)
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bufsize = (size_t)to_xfer;
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if (fwrite(*curbuf, sizeof(char), bufsize, dest) != bufsize)
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{
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printf("Destination file write error\n");
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return 1;
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}
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}
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if (UPX)
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{
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/* UPX trailer */
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/* hand assembled - so this remains ANSI C ;-) */
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/* move kernel down to place CONFIG-block, which added above,
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at start_seg-2:0 (e.g. 0x5e:0) instead of
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start_seg:0 (e.g. 0x60:0) and store there boot drive number
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from BL; kernel.asm will then check presence of additional
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CONFIG-block at this address. */
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static char trailer[] = {
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0x0E, /* 0 push cs */
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0x1F, /* 1 pop ds ; =0x60 */
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0x8C,0xDF, /* 2 mov di,ds */
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0x4F, /* 4 dec di */
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0x4F, /* 5 dec di */
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0x8E,0xC7, /* 6 mov es,di */
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0xFC, /* 8 cld */
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0x33,0xFF, /* 9 xor di,di */
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0x93, /* 11 xchg ax,bx ; mov al,bl */
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0xAA, /* 12 stosb ; mov [es:0],al */
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0x8B,0xF7, /* 13 mov si,di */
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0xB9,0x00,0x00, /* 15 mov cx,offset trailer */
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0xF3,0xA4, /* 18 rep movsb */
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0x1E, /* 20 push ds */
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0x58, /* 21 pop ax */
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0x05,0x00,0x00, /* 22 add ax,... */
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0x8E,0xD0, /* 25 mov ss,ax */
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0xBC,0x00,0x00, /* 27 mov sp,... */
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0x31,0xC0, /* 30 xor ax,ax */
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0xFF,0xE0, /* 32 jmp ax ; jmp 0 */
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};
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*(short *)&trailer[16] = (short)size + 0x20;
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*(short *)&trailer[23] = header.exInitSS;
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*(short *)&trailer[28] = header.exInitSP;
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fwrite(trailer, 1, sizeof trailer, dest);
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}
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fclose(dest);
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printf("\nProcessed %d relocations, %d not shown\n",
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header.exRelocItems, silentdone);
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return 0;
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}
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