76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
#include <system.h>
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#include <out.h>
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#include "back.h"
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/* Solve the local references.
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*/
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#define seg_index( s) ( nname - SEGBSS - 1 + s)
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long get4();
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do_local_relocation()
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/* Check if this reference is solvable. External references contain
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* -1 in 'on_valu'.
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* Also remove useless relocation structures.
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*/
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{
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register struct outrelo *rp;
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int diff = 0;
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for ( rp = reloc_info; rp < relo; rp++) {
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register struct outname *np = &symbol_table[rp->or_nami];
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int olddiff = diff;
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if ( np->on_valu != -1 && ! (np->on_type & S_COM)) {
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register long oldval,newval;
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register char *sect;
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switch( rp->or_sect - S_MIN) {
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case SEGTXT:
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sect = text_area;
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if ((rp->or_type & RELPC) &&
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(np->on_type & S_TYP) - S_MIN == SEGTXT) {
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diff++;
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}
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break;
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case SEGCON:
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sect = data_area;
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break;
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default:
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fprint( STDERR,
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"do_local_relo(): bad section %d\n",
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rp->or_sect - S_MIN);
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break;
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}
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if ( rp->or_type & RELO4) {
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oldval = get4( sect, rp->or_addr);
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newval = oldval + np->on_valu;
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put4( sect, rp->or_addr, newval);
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}
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else if ( rp->or_type & RELO2) {
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oldval = (long) get2( sect, rp->or_addr);
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newval = oldval + np->on_valu;
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put2( sect, rp->or_addr, (int) newval);
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}
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else if ( rp->or_type & RELO1) {
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oldval = (long) get1( sect, rp->or_addr);
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newval = oldval + np->on_valu;
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put1( sect, rp->or_addr, (char) newval);
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}
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else
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fprint( STDERR, "do_relo() : bad relocation size\n");
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rp->or_nami = seg_index((np->on_type & S_TYP) - S_MIN);
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/* print(
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"reloc %s adrr=%ld sect=%ld oldval=%ld newval=%ld def = %ld\n",
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np->on_foff+string_area, rp->or_addr, rp->or_sect-S_MIN, oldval, newval, np->on_valu);
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*/
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}
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if (diff && diff == olddiff) {
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rp[-diff] = rp[0];
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}
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}
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relo -= diff;
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}
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