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xar2.c

/*
    xa65 - 6502 cross assembler and utility suite
    Copyright (C) 1989-1998 André Fachat (a.fachat@physik.tu-chemnitz.de)

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/


#include <stdio.h>
#include <stdlib.h>

#include "xah.h"
#include "xa.h"
#include "xar.h"

/*
static relocateInfo *rlist = NULL;
static int mlist = 0, nlist = 0;
static int first = -1;
*/
 
int rd_set(int pc, int afl, int l, int lab) {
      int p,pp;

      if(!rmode) return 0;

      /*printf("set relocation @$%04x, l=%d, afl=%04x\n",pc, l, afl);*/

      if(l==2 && ((afl & A_MASK)!=A_ADR)) {
        errout(W_BYTRELOC);
        /*printf("Warning: byte relocation in word value at PC=$%04x!\n",pc);*/
      }
      if(l==1 && ((afl&A_MASK)==A_ADR)) {
        if((afl & A_FMASK) != (SEG_ZERO<<8)) errout(W_ADRRELOC);
        /*printf("Warning: cutting address relocation in byte value at PC=$%04x!\n",pc);*/
        afl = (afl & (~A_MASK)) | A_LOW;
      }
      
      if(afile->rd.nlist>=afile->rd.mlist) {
        afile->rd.mlist+=500;
        afile->rd.rlist=realloc(afile->rd.rlist, afile->rd.mlist*sizeof(relocateInfo));
      }
      if(!afile->rd.rlist) {
        fprintf(stderr, "Oops: no memory for relocation table!\n");
        exit(1);
      }

      afile->rd.rlist[afile->rd.nlist].adr = pc;
      afile->rd.rlist[afile->rd.nlist].afl = afl;
      afile->rd.rlist[afile->rd.nlist].lab = lab;
      afile->rd.rlist[afile->rd.nlist].next= -1;

      /* sorting this into the list is not optimized, to be honest... */
      if(afile->rd.first<0) {
        afile->rd.first = afile->rd.nlist;
      } else {
        p=afile->rd.first; pp=-1;
        while(afile->rd.rlist[p].adr<pc && afile->rd.rlist[p].next>=0) { 
          pp=p; 
          p=afile->rd.rlist[p].next; 
        }
/*
printf("endloop: p=%d(%04x), pp=%d(%04x), nlist=%d(%04x)\n",
            p,p<0?0:afile->rd.rlist[p].adr,pp,pp<0?0:afile->rd.rlist[pp].adr,afile->rd.nlist,afile->rd.nlist<0?0:afile->rd.rlist[afile->rd.nlist].adr);
*/
        if(afile->rd.rlist[p].next<0 && afile->rd.rlist[p].adr<pc) {
          afile->rd.rlist[p].next=afile->rd.nlist;
        } else
        if(pp==-1) {
          afile->rd.rlist[afile->rd.nlist].next = afile->rd.first;
          afile->rd.first = afile->rd.nlist;
        } else {
          afile->rd.rlist[afile->rd.nlist].next = p;
          afile->rd.rlist[pp].next = afile->rd.nlist;
        }
      }
      afile->rd.nlist++;

      return 0;
}

int rd_write(FILE *fp, int pc) {
      int p=afile->rd.first;
      int pc2, afl;

      while(p>=0) {
        pc2=afile->rd.rlist[p].adr;
        afl=afile->rd.rlist[p].afl;
/*printf("rd_write: pc=%04x, pc2=%04x, afl=%x\n",pc,pc2,afl);*/
          /* hack to switch undef and abs flag from internal to file format */
          if( ((afl & A_FMASK)>>8) < SEG_TEXT) afl^=0x100;
        if((pc2-pc) < 0) { 
          fprintf(stderr, "Oops, negative offset!\n"); 
        } else {
          while((pc2-pc)>254) { 
            fputc(255,fp);
            pc+=254;
          }
          fputc(pc2-pc, fp);
          pc=pc2;
          fputc((afl>>8)&255, fp);
            if((afile->rd.rlist[p].afl&A_FMASK)==(SEG_UNDEF<<8)) {
                fputc(afile->rd.rlist[p].lab & 255, fp);
                fputc((afile->rd.rlist[p].lab>>8) & 255, fp);
            }
          if((afl&A_MASK)==A_HIGH) fputc(afl&255,fp);
        }
        p=afile->rd.rlist[p].next;
      }
      fputc(0, fp);

        free(afile->rd.rlist);
        afile->rd.rlist = NULL;
        afile->rd.mlist = afile->rd.nlist = 0;
        afile->rd.first = -1;

      return 0;
}


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