294 lines
7 KiB
C
294 lines
7 KiB
C
/* $Header$ */
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/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* This is a special cv.c program for testing purposes ;
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* it converts to a stripped version of COFF
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*/
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#include <stdio.h>
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#include <filehdr.h>
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#include <aouthdr.h>
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#include <scnhdr.h>
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#include <out.h>
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#define AOUTHSZ sizeof(AOUTHDR)
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#define ASSERT(x) switch (2) { case 0: case (x): ; }
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/*
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* Header and section table of new format object file.
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*/
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struct outhead outhead;
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struct outsect outsect[S_MAX];
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char *output_file;
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int outputfile_created;
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int rom_in_data;
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char *program ;
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char flag ;
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#define readf(a, b, c) fread((a), (b), (int)(c), input)
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#define writef(a, b, c) fwrite((a), (b), (int)(c), output)
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/* Output file definitions and such */
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#define TS 0
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#define DS 1
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#define BS 2
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#define NS 3
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FILHDR filh;
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AOUTHDR aouth;
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SCNHDR scnh[NS];
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#define ENTRY 0
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#define MC68MAGIC 0520
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#define MYFLAGS 01017
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#define STYP_TEXT 0x20
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#define STYP_DATA 0x40
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#define STYP_BSS 0x80
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#define TEXTSG 0
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#define ROMSG 1
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#define DATASG 2
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#define BSSSG 3
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#define LSECT BSSSG+1
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#define NSECT LSECT+1
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FILE *input;
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FILE *output;
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long align(a,b)
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long a,b;
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{
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a += b - 1;
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return a - a % b;
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}
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int
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follows(pa, pb)
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register struct outsect *pa, *pb;
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{
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/* return 1 if pa follows pb */
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return pa->os_base == align(pb->os_base+pb->os_size, pa->os_lign);
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}
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main(argc, argv)
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int argc;
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char *argv[];
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{
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register int nsect;
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long magic ;
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long textsize, datasize, bsssize;
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extern long ftell();
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long filepos;
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int scn;
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ASSERT(sizeof(struct outhead) == SZ_HEAD);
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ASSERT(sizeof(struct outsect) == SZ_SECT);
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input = stdin; output = stdout;
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program= argv[0] ;
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if ( argc>1 && argv[1][0]=='-' ) {
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flag=argv[1][1] ;
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argc-- ; argv++ ;
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}
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switch (argc) {
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case 1: break;
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case 3: if ((output = fopen(argv[2], "w")) == (FILE *)0)
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fatal("Can't write %s.\n", argv[2]);
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output_file = argv[2];
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outputfile_created = 1;
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/* FALLTHROUGH */
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case 2: if ((input = fopen(argv[1], "r")) == (FILE *)0)
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fatal("Can't read %s.\n", argv[1]);
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break;
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default:fatal("Usage: %s <as object> <dl object>.\n", argv[0]);
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}
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if ( !rhead(input,&outhead) )
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fatal("Reading header failed.\n");
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if (BADMAGIC(outhead))
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fatal("Not an ack object file.\n");
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if (outhead.oh_nrelo > 0)
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fprintf(stderr, "Warning: relocation information present.\n");
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if ( outhead.oh_nsect!=LSECT && outhead.oh_nsect!=NSECT )
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fatal("Input file must have %d sections, not %ld\n",
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NSECT,outhead.oh_nsect) ;
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for ( nsect=0 ; nsect<outhead.oh_nsect ; nsect++ )
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if ( !rsect(input,&outsect[nsect]) )
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fatal("Reading section table failed.\n");
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/* A few checks */
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if ( outsect[TEXTSG].os_base != ENTRY)
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fatal("text must start at %lx not at 0x%lx\n", ENTRY,
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outsect[TEXTSG].os_base) ;
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if ( outsect[BSSSG].os_flen != 0 )
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printf("Warning: bss space contains initialized data\n") ;
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/* as actually writes zeroes in the bss segment */
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if ( ! follows(&outsect[BSSSG], &outsect[DATASG]))
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fatal("bss segment must follow data segment\n") ;
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/* 410 file with ROMSG in instruction space */
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rom_in_data = 0;
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magic= 0410 ;
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textsize= (outsect[ROMSG].os_base - outsect[TEXTSG].os_base)
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+ outsect[ROMSG].os_size ;
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datasize= outsect[BSSSG].os_base - outsect[DATASG].os_base ;
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if ( ! follows(&outsect[ROMSG], &outsect[TEXTSG]))
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fatal("rom segment must follow text\n") ;
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outsect[TEXTSG].os_size = outsect[ROMSG].os_base - outsect[TEXTSG].os_base;
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outsect[DATASG].os_size = datasize;
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bsssize = outsect[BSSSG].os_size;
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if ( outhead.oh_nsect==NSECT ) {
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if ( ! follows(&outsect[LSECT], &outsect[BSSSG]))
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fatal("end segment must follow bss\n") ;
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if ( outsect[LSECT].os_size != 0 )
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fatal("end segment must be empty\n") ;
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}
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filh.f_magic = MC68MAGIC;
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filh.f_nscns = 3; /* three sections: .text, data, .bss */
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filh.f_timdat = (long) time(0); /* doesn't really matter */
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filh.f_symptr = 0L; /* no symbol table */
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filh.f_nsyms = 0L; /* ditto */
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filh.f_opthdr = AOUTHSZ;
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filh.f_flags = MYFLAGS;
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aouth.magic = magic;
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aouth.vstamp = 0;
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aouth.tsize = textsize;
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aouth.dsize = datasize;
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aouth.bsize = bsssize;
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aouth.entry = ENTRY;
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aouth.text_start= ENTRY;
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aouth.data_start= outsect[DATASG].os_base;
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strcpy(scnh[TS].s_name, _TEXT);
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strcpy(scnh[DS].s_name, _DATA);
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strcpy(scnh[BS].s_name, _BSS);
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scnh[TS].s_vaddr = (scnh[TS].s_paddr = aouth.text_start);
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scnh[DS].s_vaddr = (scnh[DS].s_paddr = aouth.data_start);
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scnh[BS].s_vaddr = (scnh[BS].s_paddr = aouth.data_start + datasize);
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scnh[TS].s_size = textsize;
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scnh[DS].s_size = datasize;
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scnh[BS].s_size = bsssize;
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scnh[TS].s_scnptr = FILHSZ + AOUTHSZ + 3 * SCNHSZ;
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scnh[DS].s_scnptr = FILHSZ + AOUTHSZ + 3 * SCNHSZ + textsize;
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scnh[BS].s_scnptr = 0L; /* always 0 for .bss section */
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for (scn=TS; scn<=BS; scn++) {
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scnh[scn].s_relptr = 0L; /* no relocation */
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scnh[scn].s_lnnoptr = 0L; /* no line numbers */
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scnh[scn].s_nreloc = 0; /* no relocation */
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scnh[scn].s_nlnno = 0; /* no line numbers */
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}
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scnh[TS].s_flags = STYP_TEXT;
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scnh[DS].s_flags = STYP_DATA;
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scnh[BS].s_flags = STYP_BSS;
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/* now write the new file headers */
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ffwrite(&filh, FILHSZ, 1);
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ffwrite(&aouth, AOUTHSZ, 1);
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ffwrite(scnh, SCNHSZ, 3); /* write all three section headers */
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emits(&outsect[TEXTSG]) ;
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emits(&outsect[ROMSG]) ;
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emits(&outsect[DATASG]) ;
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if ( outputfile_created ) chmod(argv[2],0755);
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return 0;
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}
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ffwrite(ptr, size, nitems)
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char *ptr;
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{
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writef(ptr, size, nitems);
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if (ferror(output))
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fatal("output write error\n");
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}
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/*
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* Transfer the emitted bytes from one file to another.
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*/
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emits(section) struct outsect *section ; {
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register long n ;
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register int blk;
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char buffer[BUFSIZ];
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n= section->os_flen ;
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while (n > 0) {
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blk = n > BUFSIZ ? BUFSIZ : n;
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readf(buffer, 1, blk);
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writef(buffer, 1, blk);
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n -= blk;
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}
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if ((n=section->os_size - section->os_flen) > 0) {
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fseek(output, n-1, 1);
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writef("\0",1,1);
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}
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}
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rhead(f,head) struct outhead *head ; FILE *f ; {
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char buf[SZ_HEAD] ;
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if ( fread(buf,SZ_HEAD,1,f)!=1 ) return 0 ;
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iconvert(buf,(char *)head,SF_HEAD) ;
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return 1 ;
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}
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rsect(f,sect) struct outsect *sect ; FILE *f ; {
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char buf[SZ_SECT] ;
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if ( fread(buf,SZ_SECT,1,f)!=1 ) return 0 ;
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iconvert(buf,(char *)sect,SF_SECT) ;
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return 1 ;
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}
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iconvert(buf,str,fmt) char *buf, *str, *fmt ; {
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register char *nf, *ni, *no ;
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int last, i ;
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long value ;
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ni=buf ; no=str ; nf=fmt ;
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while ( last = *nf++ ) {
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last -= '0' ;
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if ( last<1 || last >9 ) fatal("illegal out.h format string\n");
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value=0 ;
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i=last ;
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while ( i-- ) {
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value = (value<<8) + (ni[i]&0xFF) ;
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}
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switch ( last ) {
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case 0 : break ;
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case 1 : *no= value ; break ;
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case 2 : *(unsigned short *)no = value ; break ;
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case 4 : *(long *)no = value ; break ;
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default :
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fatal("illegal out.h format string\n");
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}
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ni += last ; no += last ;
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}
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}
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/* VARARGS1 */
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fatal(s, a1, a2)
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char *s;
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{
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fprintf(stderr,"%s: ",program) ;
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fprintf(stderr, s, a1, a2);
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if (outputfile_created)
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unlink(output_file);
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exit(-1);
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}
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