322 lines
7 KiB
C
322 lines
7 KiB
C
/*
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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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*/
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/*
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* This program converts ack.out format to PC/IX a.out format.
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* It uses ~em/modules/lib/libobject.a.
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*/
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#include <stdio.h>
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/* unsigned char: not portable */
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struct exec {
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char a_magic[2];
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char a_flags;
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char a_cpu;
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char a_hdrlen;
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char a_unused;
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unsigned short a_version;
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long a_text;
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long a_data;
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long a_bss;
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long a_entry;
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long a_misc;
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long a_syms;
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};
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struct nlist
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{ char n_name[8];
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long n_value;
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char n_sclass;
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char n_numaux;
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unsigned short n_type;
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};
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#include <out.h>
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#ifndef NORCSID
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static char rcs_id[] = "$Header$" ;
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#endif
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#define ENTRY 0x0 /* entry point */
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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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struct exec exec;
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char *output_file;
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int outputfile_created;
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FILE *output;
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char *program ;
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char *chars;
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char *malloc();
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char flag ;
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/* Output file definitions and such */
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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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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 struct exec *e = &exec;
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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: rd_fdopen(0);
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break;
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case 3: if ((output = fopen(argv[2], "w")) == 0) {
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fatal("Can't write %s.\n", argv[2]);
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}
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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:
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if (! rd_open(argv[1]))
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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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rd_ohead(&outhead);
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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_flags & HF_LINK)
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fatal("Contains unresolved references.\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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rd_sect(outsect, outhead.oh_nsect);
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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 %d 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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fatal("bss space contains initialized data\n") ;
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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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if (! follows(&outsect[DATASG], &outsect[ROMSG]))
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fatal("data segment must follow rom\n") ;
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outsect[ROMSG].os_size = outsect[DATASG].os_base - outsect[ROMSG].os_base;
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outsect[DATASG].os_size = outsect[BSSSG].os_base - outsect[DATASG].os_base;
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e->a_magic[0] = 01;
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e->a_magic[1] = 03;
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e->a_cpu = 04;
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e->a_hdrlen = 32;
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e->a_data = outsect[BSSSG].os_base - outsect[ROMSG].os_base;
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e->a_bss = outsect[BSSSG].os_size;
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e->a_entry = outsect[TEXTSG].os_base;
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e->a_syms = (long) outhead.oh_nname * sizeof (struct nlist);
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e->a_misc = 0x10000;
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if ( outsect[ROMSG].os_base == 0x0 ) {
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/* Separate I/D */
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e->a_flags = 0x20;
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outsect[TEXTSG].os_size = e->a_text =
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align(outsect[TEXTSG].os_size,16L);
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} else {
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e->a_flags = 0x10;
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outsect[TEXTSG].os_size = e->a_text =
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outsect[ROMSG].os_base - outsect[TEXTSG].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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}
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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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if (((unsigned) outhead.oh_nchar != outhead.oh_nchar) ||
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(outhead.oh_nchar != 0 &&
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(chars = malloc((unsigned)outhead.oh_nchar)) == 0)) {
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fprintf(stderr, "%s: (warning) No name list generated\n", program);
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e->a_syms = 0;
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}
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/* Action at last */
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fwrite((char *) e, 1, 6, output);
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wr_int2((int) e->a_version);
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wr_long(e->a_text);
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wr_long(e->a_data);
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wr_long(e->a_bss);
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wr_long(e->a_entry);
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wr_long(e->a_misc);
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wr_long(e->a_syms);
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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 (e->a_syms) emit_symtab();
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fclose(output);
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if ( outputfile_created ) chmod(argv[2],0755);
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exit(0);
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}
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wr_int2(n)
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int n;
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{
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char buf[2];
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buf[0] = n;
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buf[1] = (n >> 8);
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fwrite(buf, 1, 2, output);
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}
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wr_long(l)
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long l;
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{
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char buf[4];
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buf[0] = l;
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buf[1] = (l >> 8);
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buf[2] = (l >> 16);
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buf[3] = (l >> 24);
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fwrite(buf, 1, 4, output);
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}
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/*
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* Transfer the emitted byted 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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rd_outsect(section - outsect);
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while (n > 0) {
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blk = n > BUFSIZ ? BUFSIZ : n;
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rd_emit(buffer, (long) blk);
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fwrite(buffer, 1, blk, output);
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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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for (blk = BUFSIZ - 1; blk >= 0; blk--) {
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buffer[blk] = 0;
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}
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while (n > 0) {
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blk = n > BUFSIZ ? BUFSIZ : n;
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fwrite(buffer, 1, blk, output);
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n -= blk;
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}
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}
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}
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emit_symtab()
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{
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struct outname ACK_name; /* symbol table entry in ACK format */
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struct nlist IX_name; /* symbol table entry in PC/IX format */
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register unsigned short i;
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long l;
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long off = OFF_CHAR(outhead);
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int j;
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char *p;
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rd_string(chars,outhead.oh_nchar);
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for (i = 0; i < outhead.oh_nname; i++) {
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rd_name(&ACK_name, 1);
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switch(ACK_name.on_type & S_TYP) {
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case S_UND:
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IX_name.n_sclass = 0;
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break;
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case S_ABS:
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IX_name.n_sclass = 01;
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break;
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case S_MIN + TEXTSG:
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IX_name.n_sclass = 02;
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break;
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case S_MIN + ROMSG:
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case S_MIN + DATASG:
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IX_name.n_sclass = 03;
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break;
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case S_MIN + BSSSG:
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case S_MIN + LSECT:
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IX_name.n_sclass = 04;
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break;
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default:
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fprintf(stderr,"warning: unknown s_type: %d\n",
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ACK_name.on_type & S_TYP);
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}
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if (ACK_name.on_type & S_EXT) IX_name.n_sclass |= 020;
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IX_name.n_value = ACK_name.on_valu;
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if (ACK_name.on_foff == 0) {
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p = "\0\0";
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}
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else {
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l = ACK_name.on_foff - off;
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if (l < 0 || l >= outhead.oh_nchar) {
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fatal("bad on_off: %ld\n",l);
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}
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p = &chars[l];
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}
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for (j = 0; j < 8; j++) {
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IX_name.n_name[j] = *p++;
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if (*p == '\0') break;
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}
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for (j++; j < 8; j++) {
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IX_name.n_name[j] = 0;
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}
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fwrite((char *) &IX_name, 1, 8, output);
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wr_long(IX_name.n_value);
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fwrite(&(IX_name.n_sclass), 1, 2, output);
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wr_int2((int) IX_name.n_type);
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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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fclose(output);
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unlink(output_file);
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}
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exit(1);
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}
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rd_fatal()
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{
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fatal("read error\n");
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}
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