298 lines
7.4 KiB
C
298 lines
7.4 KiB
C
#include <system.h>
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#include <em.h>
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#include <out.h>
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#include "mach.h"
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#include "back.h"
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/* Unportable code. Written for VAX, meant to be run on a VAX.
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*/
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#ifndef vax
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Read above comment ...
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#endif
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extern File *B_out_file;
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#include <a.out.h>
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#include <alloc.h>
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static struct exec u_header;
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static long ntext, ndata, nrelo, nchar;
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long B_base_address[SEGBSS+1];
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static int trsize=0, drsize=0;
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static struct relocation_info *u_reloc;
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static reduce_name_table(), putbuf(), put_stringtablesize();
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static convert_name(), convert_reloc(), init_unixheader();
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output_back()
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{
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register int i;
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register struct nlist *u_name;
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register struct outrelo *rp;
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/*
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* Convert relocation data structures. This also requires
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* some re-ordering, as SUN .o format needs has text relocation
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* structures in front of the data relocation structures, whereas in
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* ACK they can be in any order.
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*/
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nrelo = relo - reloc_info;
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u_reloc = (struct relocation_info *)
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Malloc((unsigned)nrelo*sizeof(struct relocation_info));
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rp = reloc_info;
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for (i = nrelo; i > 0; i--, rp++) {
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if ( ( rp->or_sect-S_MIN) == SEGTXT &&
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convert_reloc( rp, u_reloc)) {
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trsize++;
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u_reloc++;
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}
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}
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rp = reloc_info;
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for (i = nrelo; i > 0; i--, rp++) {
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if ( ( rp->or_sect-S_MIN) != SEGTXT &&
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convert_reloc( rp, u_reloc)) {
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u_reloc++;
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drsize++;
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}
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}
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nrelo = trsize + drsize;
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u_reloc -= nrelo;
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reduce_name_table();
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init_unixheader();
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putbuf( (char *) &u_header, sizeof(struct exec));
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putbuf( (char *) text_area, ntext);
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putbuf( (char *) data_area, ndata);
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putbuf((char *) u_reloc, sizeof(struct relocation_info)*nrelo);
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free(u_reloc);
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u_name = (struct nlist *)
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Malloc((unsigned)nname * sizeof(struct nlist));
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for (i = 0; i < nname ; i++) { /* The segment names can be omitted */
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convert_name( &symbol_table[i], u_name++);
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}
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u_name -= nname;
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putbuf((char *) u_name, sizeof(struct nlist)*nname);
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free(u_name);
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/* print( "size string_area %d\n", nchar); */
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put_stringtablesize( nchar + 4);
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putbuf((char *) string_area, nchar);
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}
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static
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reduce_name_table()
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{
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/*
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* Reduce the name table size. This is done by first marking
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* the name-table entries that are needed for relocation, then
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* removing the entries that are compiler-generated and not
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* needed for relocation, while remembering how many entries were
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* removed at each point, and then updating the relocation info.
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* After that, the string table is reduced.
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*/
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#define S_NEEDED S_MOD
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#define removable(nm) (!(nm->on_type & (S_NEEDED|S_STB)) && *(nm->on_foff+string_area) == GENLAB)
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register int *diff_index =
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(int *) Malloc((unsigned)(nname + 1) * sizeof(int));
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register int i;
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register struct outname *np;
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char *new_str;
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register char *p, *q;
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register struct relocation_info *rp;
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*diff_index++ = 0;
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rp = u_reloc;
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for (i = nrelo; i > 0; i--, rp++) {
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if (rp->r_extern) {
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symbol_table[rp->r_symbolnum].on_type |= S_NEEDED;
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}
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}
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np = symbol_table;
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for (i = 0; i < nname; i++, np++) {
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int old_diff_index = diff_index[i-1];
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if (removable(np)) {
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diff_index[i] = old_diff_index + 1;
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}
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else {
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diff_index[i] = old_diff_index;
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}
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if ((np->on_type & S_TYP) == S_CRS) {
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struct outname *n = &symbol_table[(int) np->on_valu];
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if (! (n->on_type & S_COM)) {
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np->on_type &= ~S_TYP;
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np->on_type |= (n->on_type & S_TYP);
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np->on_valu = n->on_valu;
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}
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}
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}
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rp = u_reloc;
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for (i = nrelo; i > 0; i--, rp++) {
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if (rp->r_extern) {
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symbol_table[rp->r_symbolnum].on_type &= ~S_NEEDED;
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rp->r_symbolnum -= diff_index[rp->r_symbolnum];
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}
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}
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for (i = 0, np = symbol_table; i < nname; i++, np++) {
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if ((np->on_type & S_TYP) == S_CRS) {
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np->on_valu -= diff_index[(int) np->on_valu];
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}
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if (diff_index[i] && diff_index[i] == diff_index[i-1]) {
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symbol_table[i - diff_index[i]] = *np;
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}
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}
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nname -= diff_index[nname - 1];
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free((char *)(diff_index-1));
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new_str = q = Malloc((unsigned)(string - string_area));
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np = symbol_table;
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for (i = nname; i > 0; i--, np++) {
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p = np->on_foff + string_area;
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np->on_foff = q - new_str;
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while (*q++ = *p) p++;
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}
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free(string_area);
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string_area = new_str;
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string = q;
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}
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static
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init_unixheader()
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{
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ntext = text - text_area;
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ndata = data - data_area;
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nchar = string - string_area;
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u_header.a_magic = OMAGIC;
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u_header.a_text = ntext;
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u_header.a_data = ndata;
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u_header.a_bss = nbss;
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u_header.a_syms = nname * sizeof(struct nlist);
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u_header.a_entry = 0;
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u_header.a_trsize = trsize * sizeof(struct relocation_info);
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u_header.a_drsize = drsize * sizeof(struct relocation_info);
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/* print( "header %o %d %d %d %d %d %d %d\n",
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u_header.a_magic, u_header.a_text, u_header.a_data,
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u_header.a_bss, u_header.a_syms, u_header.a_entry,
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u_header.a_trsize, u_header.a_drsize);
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*/
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}
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static
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convert_reloc( a_relo, u_relo)
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register struct outrelo *a_relo;
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register struct relocation_info *u_relo;
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{
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int retval = 1;
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u_relo->r_address = a_relo->or_addr;
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u_relo->r_symbolnum = a_relo->or_nami;
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u_relo->r_pcrel = (a_relo->or_type & RELPC) >> 3;
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u_relo->r_length = 2;
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if ( symbol_table[ a_relo->or_nami].on_valu == -1 ||
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(symbol_table[ a_relo->or_nami].on_type & S_COM))
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u_relo->r_extern = 1;
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else
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u_relo->r_extern = 0;
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if ( u_relo->r_extern == 0) {
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switch ( (symbol_table[ a_relo->or_nami].on_type & S_TYP) - S_MIN) {
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case SEGTXT : u_relo->r_symbolnum = N_TEXT;
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if (u_relo->r_pcrel &&
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(a_relo->or_sect-S_MIN == SEGTXT))
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retval = 0;
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break;
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case SEGCON : u_relo->r_symbolnum = N_DATA;
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break;
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case SEGBSS : u_relo->r_symbolnum = N_BSS;
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break;
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/* Shut up; this can actually happen on erroneous input
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default : fprint( STDERR,
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"convert_relo(): bad segment %d\n",
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(symbol_table[ a_relo->or_nami].on_type & S_TYP) - S_MIN);
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*/
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}
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}
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return retval;
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}
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#define n_mptr n_un.n_name
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#define n_str n_un.n_strx
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static
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convert_name( a_name, u_name)
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register struct outname *a_name;
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register struct nlist *u_name;
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{
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/* print( "naam is %s\n", a_name->on_foff + string_area); */
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u_name->n_str = a_name->on_foff + 4;
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if (a_name->on_type & S_STB) u_name->n_type = a_name->on_type >> 8;
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else u_name->n_type = 0;
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if ((a_name->on_type & S_TYP) == S_CRS) {
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a_name->on_valu = 0;
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a_name->on_type = S_COM;
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}
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if (a_name->on_valu != -1 && (! (a_name->on_type & S_COM))) {
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switch((a_name->on_type & S_TYP) - S_MIN) {
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case SEGTXT:
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u_name->n_type |= N_TEXT;
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break;
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case SEGCON:
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u_name->n_type |= N_DATA;
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break;
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case SEGBSS:
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u_name->n_type |= N_BSS;
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break;
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/* Shut up; this can actually happen on erroneous input
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default:
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fprint(STDERR, "convert_name(): bad section %d\n",
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(a_name->on_type & S_TYP) - S_MIN);
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break;
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*/
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}
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}
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if ((a_name->on_type & S_TYP) == S_UND ||
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(a_name->on_type & S_EXT)) u_name->n_type |= N_EXT;
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u_name->n_other = '\0';
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u_name->n_desc = a_name->on_desc;
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if (a_name->on_type & S_COM)
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u_name->n_value = a_name->on_valu;
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else if ( a_name->on_valu != -1)
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u_name->n_value = a_name->on_valu +
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B_base_address[( a_name->on_type & S_TYP) - S_MIN];
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else
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u_name->n_value = 0;
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}
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static
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put_stringtablesize( n)
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long n;
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{
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putbuf( (char *)&n, 4L);
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}
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static
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putbuf(buf,n)
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char *buf;
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long n;
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{
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sys_write( B_out_file, buf, n);
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}
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