- hptr = unresolved; // Point to unresolved symbols list
-
- while (hptr != NULL) { // While unresolved list is valid
- if (ost_add(hptr->h_sym, T_EXT, 0L) == -1) return 1;
- htemp = hptr->h_next; // Temporarily get ptr to next record
- free(hptr); // Free current record
- hptr = htemp; // Make next record ptr, current
- }
-
- unresolved = NULL; // Zero unresolved record list
-
- return 0;
-}
-
-// -------------------------------------------------------------------------------------------------
-// Update Object File TEXT and DATA Segments Based on Relocation Records. Take in an OFILE header
-// and flag (T_TEXT, T_DATA) to process. Return (0) is successful or non-zero (1) if failed.
-// -------------------------------------------------------------------------------------------------
-
-int reloc_segment(struct OFILE *ofile, int flag) {
- char *symtab; // Start of symbol table
- char *symbols; // Start of symbols
- char *sptr; // Start of segment data
- char *rptr; // Start of segment relocation records
- unsigned symidx; // Offset to symbol
- unsigned addr; // Relocation address
- unsigned rflg; // Relocation flags
- unsigned olddata; // Old segment data at reloc address
- unsigned newdata = 0; // New segment data at reloc address
- unsigned pad; // Temporary to calculate phrase padding
- int i; // Iterator
- char sym[SYMLEN]; // String for symbol name/hash search
- int ssidx; // Segment size table index
- unsigned glblreloc; // Global relocation flag
- unsigned absreloc; // Absolute relocation flag
- unsigned relreloc; // Relative relocation flag
- unsigned swcond; // Switch statement condition
- unsigned relocsize; // Relocation record size
-
- // If there is no TEXT relocation data for the selected object file segment then update the COF
- // TEXT segment offset allowing for the phrase padding
- if ((flag == T_TEXT) && !ofile->o_header.absrel.reloc.tsize) {
- pad = ((ofile->o_header.tsize+secalign) & ~secalign); // TEXT segment size plus padding
- textoffset += (ofile->o_header.tsize + (pad - ofile->o_header.tsize));
- if (vflag > 1) { // Verbose mode information
- printf("reloc_segment(%s, TEXT) : No Relocation Data\n", ofile->o_name);
- }
- return 0;
- }
-
- // If there is no DATA relocation data for the selected object file segment then update the COF
- // DATA and BSS segment offsets allowing for the phrase padding
- if ((flag == T_DATA) && !ofile->o_header.absrel.reloc.dsize) {
- pad = ((ofile->o_header.dsize+secalign) & ~secalign); // DATA segment size plus padding
- dataoffset += (ofile->o_header.dsize + (pad - ofile->o_header.dsize));
- pad = ((ofile->o_header.bsize+secalign) & ~secalign); // BSS segment size plus padding
- bssoffset += (ofile->o_header.bsize + (pad - ofile->o_header.bsize));
- if (vflag > 1) { // Verbose mode information
- printf("reloc_segment(%s, DATA) : No Relocation Data\n", ofile->o_name);
- }
- return 0;
- }
-
- // Verbose mode information
- if (vflag > 1) {
- printf("reloc_segment(%s, %s) : Processing Relocation Data\n",
- ofile->o_name, flag == T_DATA ? "DATA" : "TEXT");
- }
-
- // Obtain pointer to start of symbol table
- symtab = (ofile->o_image + 32 + ofile->o_header.tsize + ofile->o_header.dsize +
- ofile->o_header.absrel.reloc.tsize + ofile->o_header.absrel.reloc.dsize);
-
- // Obtain pointer to start of symbols
- symbols = symtab + ofile->o_header.ssize;
-
- // Obtain pointer to start of TEXT segment
- sptr = ofile->o_image + 32;
-
- // Obtain pointer to start of TEXT relocation records
- rptr = sptr + (ofile->o_header.tsize + ofile->o_header.dsize);
-
- relocsize = ofile->o_header.absrel.reloc.tsize;
-
- // Update pointers if DATA relocation records are being processed
- if (flag == T_DATA) {
- sptr += ofile->o_header.tsize; // Start of DATA segment
- rptr += ofile->o_header.absrel.reloc.tsize; // Start of DATA relocation records
- relocsize = ofile->o_header.absrel.reloc.dsize;
- }
-
- // Process each relocation record for the TEXT segment
- for(i = 0; i < (int)relocsize; i += 8) {
- // Obtain both the relocation address and the relocation flags from the object file image
- addr = getlong(rptr);
- rflg = getlong(rptr + 4);
- glblreloc = (rflg & 0x00000010) ? 1 : 0; // Set global relocation flag
- absreloc = (rflg & 0x00000040) ? 1 : 0; // Set absolute relocation flag
- relreloc = (rflg & 0x000000A0) ? 1 : 0; // Set relative relocation flag
-
- // Additional processing required for global relocations
- if (glblreloc) {
- // Obtain the string table index for the relocation symbol, look for it in the globals
- // hash table to obtain information on that symbol. For the hash calculation to work
- // correctly it must be placed in a 'clean' string before looking it up.
- symidx = getlong(symtab + ((rflg >> 8) * 12));
- memset(sym, 0, SYMLEN);
- strcpy(sym, symbols + symidx);
- olddata = newdata = 0; // Initialise old and new segment data
- ssidx = ost_lookup(sym);
- newdata = getlong(ost + ((ssidx-1) * 12) + 8);
- }
-
- // Obtain the existing long word segment data and flip words if the relocation flags
- // indicate it relates to a RISC MOVEI instruction
- olddata = getlong(sptr + addr);
- if (rflg & 0x01) olddata = _SWAPWORD(olddata);
-
- // Process record dependant on segment it relates to; TEXT, DATA or BSS. Construct a new
- // relocated segment long word based on the required segment base address, the segment
- // data offset in the resulting COF file and the offsets from the incoming object file.
- //swcond = glblreloc ? ((hptr->h_type & 0x0E000000) >> 16) : (rflg & 0xFFFFFF00);
- swcond = (rflg & 0xFFFFFF00);
- if (!glblreloc) {
- switch (swcond) {
- case 0x00000200: // Absolute Value
- break;
- case 0x00000400: // TEXT segment relocation record
- if (!glblreloc)
- if (flag == T_TEXT) newdata = tbase + textoffset + olddata;
- else newdata = tbase + dataoffset + olddata;
- break;
- case 0x00000600: // DATA segment relocation record
- if (!glblreloc) newdata = dbase + dataoffset + (olddata - ofile->o_header.tsize);
- break;
- case 0x00000800: // BSS segment relocation record
- if (!glblreloc) newdata = bbase + bssoffset +
- (olddata - (ofile->o_header.tsize + ofile->o_header.dsize));
- break;
- }
- } else {
- if (!relreloc) newdata += olddata;
- }
- // Set absolute (long) or relative (word) address of symbol
- if (absreloc) {
- // Flip the new long word segment data if the relocation record indicated a RISC MOVEI
- // instruction and place the resulting data back in the COF segment
- if (rflg & 0x01) newdata = _SWAPWORD(newdata);
-
- putlong(sptr + addr, newdata);
-
- }
- else if (relreloc) {
- putword(sptr + addr, newdata - tbase - addr - ofile->o_tbase);
- }
-
- rptr += 8; // Point to the next relocation record
- }
-
- // Update the COF segment offset allowing for the phrase padding.
- if (flag == T_TEXT) {
- pad = ((ofile->o_header.tsize+secalign) & ~secalign); // TEXT segment plus padding
- textoffset += (ofile->o_header.tsize + (pad - ofile->o_header.tsize));
- } else {
- pad = ((ofile->o_header.dsize+secalign) & ~secalign); // DATA segment plus padding
- dataoffset += (ofile->o_header.dsize + (pad - ofile->o_header.dsize));
- pad = ((ofile->o_header.bsize+secalign) & ~secalign); // BSS segment plus padding
- bssoffset += (ofile->o_header.bsize + (pad - ofile->o_header.bsize));
- }
-
- return 0; // Return value, should always be zero
-}