588 lines
12 KiB
C
588 lines
12 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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*/
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/*
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* Convert ACK a.out file to VAX Berkeley Unix object format.
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*/
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#include <stdio.h>
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#include <out.h>
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#include <assert.h>
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long lseek();
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#define OMAGIC 0407 /* old-fashioned */
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#define NMAGIC 0410 /* text write protexted */
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#define ZMAGIC 0413 /* demand paging */
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struct bhdr {
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long magic;
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long tsize;
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long dsize;
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long bsize;
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long ssize;
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long entry;
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long rtsize;
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long rdsize;
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};
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struct machrelo {
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long address;
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long relodata;
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};
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#define setpcrel(X,f) (X |= (f<<7))
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#define setsymbolnum(X,n) (X = (X & 0377) | ((long)n << 8))
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#define setextern(X,f) (X |= (f << 4))
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#define setlength(X,l) (X = (X & ~0x60)|((long) l << 5))
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struct sym {
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long name;
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char type;
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char other;
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short desc;
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long value;
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};
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#define N_UNDF 0
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#define N_ABS 02
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#define N_TEXT 04
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#define N_DATA 06
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#define N_BSS 010
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#define N_EXT 01
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#define N_FN 0x1f
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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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long magic;
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int rom_in_data;
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char *program ;
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char flag ;
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/* Output file definitions and such */
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struct bhdr bh;
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#define ENTRY 0x0
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#define TOT_HDRSIZE (sizeof(struct bhdr))
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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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int output;
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int unresolved;
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int nflag;
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long textsize ;
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long datasize ;
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long bsssize;
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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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program= argv[0] ;
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while ( argc>1 && argv[1][0]=='-' ) {
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flag=argv[1][1] ;
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if (flag == 'u') unresolved++;
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else if (flag == 'n') nflag = 1;
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argc-- ; argv++ ;
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}
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switch (argc) {
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case 3: if ((output = creat(argv[2], 0644)) < 0 ||
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(close(output), output = open(argv[2],2)) < 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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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 [-u] [-n] <ACK object> <Vax object>.\n", program);
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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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if (! unresolved) {
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fprintf(stderr,"Warning: contains unresolved references.\n");
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}
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unresolved++;
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}
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else if (outhead.oh_nrelo > 0 && !unresolved)
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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[BSSSG].os_flen != 0 )
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fatal("bss space contains initialized data\n") ;
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if ( !unresolved && ! follows(&outsect[BSSSG], &outsect[DATASG]))
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fatal("bss segment must follow data segment\n") ;
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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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if (! follows(&outsect[DATASG], &outsect[ROMSG]))
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fatal("data segment must follow rom\n") ;
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outsect[TEXTSG].os_size = outsect[ROMSG].os_base - outsect[TEXTSG].os_base;
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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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if ( outsect[ROMSG].os_lign == 0x400 ) {
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/* 410/413 file with ROMSG in data space */
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rom_in_data = 1;
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magic= NMAGIC ;
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textsize= outsect[TEXTSG].os_size;
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datasize= outsect[ROMSG].os_size + outsect[DATASG].os_size ;
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} else
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if ( outsect[DATASG].os_lign == 0x400 ) {
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/* 410/413 file with ROMSG in instruction space */
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rom_in_data = 0;
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magic= NMAGIC ;
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textsize= outsect[TEXTSG].os_size + outsect[ROMSG].os_size ;
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datasize= outsect[DATASG].os_size ;
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} else {
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/* Plain 407 file */
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rom_in_data = 0;
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magic= OMAGIC ;
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textsize= outsect[TEXTSG].os_size + outsect[ROMSG].os_size ;
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datasize = outsect[DATASG].os_size;
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}
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bsssize = outsect[BSSSG].os_size;
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if (nflag && magic != NMAGIC) {
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fatal("illegal alignments.\n");
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}
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if (magic == NMAGIC && ! nflag) {
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if (datasize & 0x3ff) {
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int diff = 0x400 - (datasize & 0x3ff);
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if (bsssize >= diff) bsssize -= diff;
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else bsssize = 0;
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outsect[DATASG].os_size += diff;
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datasize += diff;
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}
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magic = ZMAGIC;
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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 (magic != OMAGIC && unresolved) {
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fatal("unresolved references with wrong magic number\n");
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}
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if (outsect[TEXTSG].os_base != ENTRY) {
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fatal("Illegal entry point.\n");
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}
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bh.magic = magic;
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bh.tsize = textsize;
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bh.bsize = bsssize;
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bh.dsize = datasize;
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bh.rtsize = 0;
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bh.rdsize = 0;
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bh.entry = ENTRY;
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/* Action at last */
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if (magic == ZMAGIC) {
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lseek(output,(long) 0x400, 0);
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}
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else lseek(output,(long) TOT_HDRSIZE,0);
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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 (unresolved) emit_relo();
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emit_symtab();
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bh.ssize = outhead.oh_nname * sizeof(struct sym);
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lseek(output,0L,0);
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cvlong(&(bh.magic));
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cvlong(&(bh.tsize));
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cvlong(&(bh.dsize));
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cvlong(&(bh.bsize));
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cvlong(&(bh.ssize));
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cvlong(&(bh.entry));
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cvlong(&(bh.rtsize));
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cvlong(&(bh.rdsize));
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writef(&bh, 1, (long) TOT_HDRSIZE);
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if ( outputfile_created && !unresolved ) chmod(argv[2],0755);
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exit(0);
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}
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writef(addr,sz,cnt)
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char *addr;
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long cnt;
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{
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cnt *= sz;
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while (cnt) {
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int i = cnt >= 0x4000 ? 0x4000 : cnt;
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cnt -= i;
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if (write(output, addr, i) < i) {
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fatal("write error\n");
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}
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addr += i;
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}
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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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char *p;
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char *calloc(), *malloc();
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long sz = section->os_flen;
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rd_outsect(section - outsect);
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while (sz) {
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unsigned int i = (sz >= 0x4000 ? 0x4000 : sz);
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if (!(p = malloc(i))) {
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fatal("No memory.\n");
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}
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rd_emit(p, i);
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if (write(output, p, i) < i) {
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fatal("write error.\n");
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}
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free(p);
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sz -= i;
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}
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sz = section->os_size - section->os_flen;
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if (sz) {
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if (!(p = calloc(0x4000, 1))) {
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fatal("No memory.\n");
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}
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while (sz) {
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unsigned int i = (sz >= 0x4000 ? 0x4000 : sz);
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if (write(output, p, i) < i) {
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fatal("write error.\n");
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}
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sz -= i;
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}
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free(p);
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}
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}
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struct outname *ACKnames;
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emit_relo()
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{
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struct outrelo *ACKrelo;
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struct machrelo *MACHtrelo,*MACHdrelo;
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register struct outrelo *ap;
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register struct machrelo *mtp, *mdp;
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unsigned int cnt = outhead.oh_nrelo;
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ACKrelo = (struct outrelo *) calloc(cnt, sizeof(struct outrelo));
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MACHtrelo = (struct machrelo *) calloc(cnt, sizeof(struct machrelo));
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MACHdrelo = (struct machrelo *) calloc(cnt, sizeof(struct machrelo));
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ACKnames = (struct outname *) calloc(outhead.oh_nname, sizeof(struct outname));
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if (!(ap = ACKrelo) || !(mtp = MACHtrelo) || !(mdp = MACHdrelo) ||
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!ACKnames) {
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fatal("No memory.\n");
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}
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rd_relo(ACKrelo, cnt);
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rd_name(ACKnames, outhead.oh_nname);
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while (cnt-- != 0) {
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register struct machrelo *mp;
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if (ap->or_sect - S_MIN <= ROMSG) mp = mtp++;
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else mp = mdp++;
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setlength(mp->relodata,(ap->or_type&RELSZ) >> 1);
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setpcrel(mp->relodata,(ap->or_type&RELPC != 0));
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mp->address = ap->or_addr;
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if (ap->or_sect == ROMSG+S_MIN) {
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mp->address += outsect[TEXTSG].os_size;
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}
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if (ap->or_nami < outhead.oh_nname) {
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if (ACKnames[ap->or_nami].on_type & S_EXT) {
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setsymbolnum(mp->relodata, ap->or_nami);
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setextern(mp->relodata,1);
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}
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else {
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patch(ap, &ACKnames[ap->or_nami], mp);
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}
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}
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else {
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setsymbolnum(mp->relodata, N_ABS);
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}
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cvlong(&(mp->address));
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cvlong(&(mp->relodata));
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ap++;
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}
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bh.rtsize = (char *) mtp - (char *) MACHtrelo;
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bh.rdsize = (char *) mdp - (char *) MACHdrelo;
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writef(MACHtrelo, 1, bh.rtsize);
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writef(MACHdrelo, 1, bh.rdsize);
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free(ACKrelo);
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free(MACHtrelo);
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free(MACHdrelo);
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}
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long
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get(sz)
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{
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char buf[10];
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long l = 0;
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register char *p = buf + sz;
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read(output,buf,sz);
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while (sz--) {
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l = (l << 8) | (*--p & 0377);
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}
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return l;
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}
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put(l,sz)
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long l;
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{
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char buf[10];
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register char *p = buf;
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*p++ = l;
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*p++ = l >> 8;
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*p++ = l >> 16;
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*p++ = l >> 24;
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p -= sz;
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if (write(output, p, sz) < sz) {
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fatal("write error.\n");
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}
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}
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patch(ap, an, mp)
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register struct outrelo *ap;
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register struct outname *an;
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register struct machrelo *mp;
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{
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int whichsect = (an->on_type & S_TYP) - S_MIN;
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long correction = 0;
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long where = TOT_HDRSIZE+ap->or_addr;
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long X;
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long here;
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int sz;
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if (!(an->on_type & S_SCT)) {
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fprintf(stderr,"funny on_type %x\n", an->on_type);
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}
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switch(whichsect) {
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case TEXTSG:
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setsymbolnum(mp->relodata,N_TEXT);
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return;
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case DATASG:
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correction = outsect[ROMSG].os_size + outsect[TEXTSG].os_size;
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setsymbolnum(mp->relodata,N_DATA);
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break;
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case ROMSG:
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correction = outsect[TEXTSG].os_size;
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setsymbolnum(mp->relodata,N_TEXT);
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break;
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case BSSSG:
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correction = outsect[ROMSG].os_size + outsect[TEXTSG].os_size+
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outsect[DATASG].os_size;
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setsymbolnum(mp->relodata,N_BSS);
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break;
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default:
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assert(0);
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}
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switch(ap->or_sect - S_MIN) {
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case DATASG:
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where += outsect[ROMSG].os_size;
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case ROMSG:
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where += outsect[TEXTSG].os_size;
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case TEXTSG:
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break;
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default:
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assert(0);
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}
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here = lseek(output, 0L, 1);
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lseek(output, where, 0);
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sz = ap->or_type & RELSZ;
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X = get(sz) + correction;
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lseek(output, where, 0);
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put(X,sz);
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lseek(output, here, 0);
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}
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cvlong(l)
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long *l;
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{
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long x = *l;
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char *p = (char *) l;
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*p++ = x;
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*p++ = x >> 8;
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*p++ = x >> 16;
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*p++ = x >> 24;
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}
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int
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is_rest_local(A, i)
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register int i;
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register struct outname *A;
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{
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while (i--) {
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if (A->on_type & S_EXT) return 0;
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A++;
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}
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return 1;
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}
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emit_symtab()
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{
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register unsigned short i = outhead.oh_nname;
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register struct outname *A;
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struct sym *MACHnames;
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register struct sym *M;
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extern char *malloc(), *calloc();
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char *chars;
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long offX = OFF_CHAR(outhead) - 4;
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if (!(A = ACKnames)) {
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if (!(A = (struct outname *)
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calloc(i, sizeof(struct outname)))) {
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fatal("No memory.\n");
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}
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rd_name(A, outhead.oh_nname);
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}
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if (!(M = (struct sym *) calloc(i, sizeof(struct sym)))) {
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fatal("No memory.\n");
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}
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MACHnames = M;
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ACKnames = A;
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for (; i; i--, A++) {
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M->value = A->on_valu;
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if (A->on_type & S_SCT ||
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(A->on_type & S_ETC) == S_FIL) {
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static int rest_local;
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if (! unresolved || rest_local || (rest_local = is_rest_local(A, i))) {
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outhead.oh_nname--;
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continue;
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}
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}
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if (A->on_type & S_COM) {
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M->type = N_UNDF | N_EXT;
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}
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else switch(A->on_type & S_TYP) {
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case S_UND:
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switch(A->on_type & S_ETC) {
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default:
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M->type = N_UNDF;
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break;
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case S_MOD:
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M->type = N_FN;
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break;
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case S_LIN:
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M->type = N_ABS;
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break;
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}
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break;
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case S_ABS:
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M->type = N_ABS;
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break;
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case S_MIN + TEXTSG:
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M->type = N_TEXT;
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break;
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case S_MIN + ROMSG:
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if (unresolved) {
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M->value += outsect[TEXTSG].os_size;
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}
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M->type = (rom_in_data ? N_DATA : N_TEXT);
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break;
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case S_MIN + DATASG:
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if (unresolved) {
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M->value += outsect[TEXTSG].os_size +
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outsect[ROMSG].os_size;
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}
|
|
M->type = N_DATA;
|
|
break;
|
|
case S_MIN + BSSSG:
|
|
if (unresolved) {
|
|
M->value += outsect[TEXTSG].os_size +
|
|
outsect[ROMSG].os_size +
|
|
outsect[DATASG].os_size;
|
|
}
|
|
M->type = N_BSS;
|
|
break;
|
|
case S_MIN + LSECT:
|
|
M->type = N_BSS;
|
|
break;
|
|
default:
|
|
fprintf(stderr,"warning: unknown s_type: %d\n",
|
|
A->on_type & S_TYP);
|
|
}
|
|
if (A->on_type & S_EXT) M->type |= N_EXT;
|
|
M->name = A->on_foff;
|
|
M++;
|
|
}
|
|
M = MACHnames;
|
|
for (i = outhead.oh_nname; i; i--, M++) {
|
|
if (M->name) {
|
|
M->name -= offX;
|
|
}
|
|
else M->name = outhead.oh_nchar + 3; /* pointer to nullbyte */
|
|
cvlong(&(M->name));
|
|
cvlong(&(M->value));
|
|
}
|
|
writef(MACHnames, sizeof(struct sym), (long) outhead.oh_nname);
|
|
free(MACHnames);
|
|
free(ACKnames);
|
|
if ((unsigned) outhead.oh_nchar != outhead.oh_nchar ||
|
|
!( chars = malloc((unsigned) outhead.oh_nchar))) {
|
|
fatal("No memory\n.");
|
|
}
|
|
put(outhead.oh_nchar+4,4);
|
|
rd_string(chars,outhead.oh_nchar);
|
|
writef(chars, 1, outhead.oh_nchar);
|
|
free(chars);
|
|
}
|
|
|
|
/* VARARGS1 */
|
|
fatal(s, a1, a2)
|
|
char *s;
|
|
{
|
|
fprintf(stderr,"%s: ",program) ;
|
|
fprintf(stderr, s, a1, a2);
|
|
if (outputfile_created)
|
|
unlink(output_file);
|
|
exit(-1);
|
|
}
|
|
|
|
rd_fatal() { fatal("read error.\n"); }
|