static int tos_initwrite(struct GlobalVars *gv, struct LinkedSection **sections) /* find exactly one ST_CODE, ST_DATA and ST_UDATA section, which will become .text, .data and .bss, then count the number of symbol definitions and references */ { static const char *fn = "tos_initwrite(): "; struct LinkedSection *ls; struct Symbol *sym; struct Reloc *xref; int i,cnt; get_text_data_bss(gv,sections); /* count symbols and unresolved references */ for (i=0,cnt=0; i<3; i++) { if (sections[i]) { for (sym=(struct Symbol *)sections[i]->symbols.first; sym->n.next!=NULL; sym=(struct Symbol *)sym->n.next) { if (!discard_symbol(gv,sym)) { ++cnt; if (strlen(sym->name) > DRI_NAMELEN) ++cnt; /* extra symbol for long name */ } } if (gv->dest_object) { for (xref=(struct Reloc *)sections[i]->xrefs.first; xref->n.next!=NULL; xref=(struct Reloc *)xref->n.next) { ++cnt; if (strlen(xref->xrefname) > DRI_NAMELEN) ++cnt; /* extra symbol for long name */ } } } } text_data_bss_gaps(sections); /* calculate gap size between sections */ return cnt; }
static void aoutmint_writeexec(struct GlobalVars *gv,FILE *f) /* creates an a.out-MiNT executable file */ { const int be = _BIG_ENDIAN_; uint8_t jmp_entry_code[] = { 0x20,0x3a,0x00,0x1a,0x4e,0xfb,0x08,0xfa }; struct LinkedSection *sections[3]; unsigned long secsizes[2]; struct mint_exec me; long tparel_offset,tparel_size; struct nlist32 *stksize; aout_initwrite(gv,sections); if (sections[0] == NULL) /* this requires a .text section! */ error(97,fff[gv->dest_format]->tname,TEXTNAME); memset(&me,0,sizeof(struct mint_exec)); /* init header with zero */ text_data_bss_gaps(sections); /* calculate gap size between sections */ secsizes[0] = sections[0]->size + sections[0]->gapsize; secsizes[1] = sections[1] ? sections[1]->filesize : 0; /* init TOS header */ write16be(me.tos.ph_branch,0x601a); write32be(me.tos.ph_tlen,secsizes[0]+TEXT_OFFSET); write32be(me.tos.ph_dlen,secsizes[1]); write32be(me.tos.ph_blen,(sections[2]?sections[2]->size:0) + (sections[1]?sections[1]->gapsize:0)); write32be(me.tos.ph_magic,0x4d694e54); /* "MiNT" */ write32be(me.tos.ph_flags,gv->tosflags); /* Atari memory flags */ write16be(me.tos.ph_abs,0); /* includes relocations */ aout_addsymlist(gv,sections,BIND_GLOBAL,0,be); aout_addsymlist(gv,sections,BIND_WEAK,0,be); aout_addsymlist(gv,sections,BIND_LOCAL,0,be); aout_debugsyms(gv,be); calc_relocs(gv,sections[0]); calc_relocs(gv,sections[1]); /* The Atari symbol table size is the sum of a.out symbols and strings, which is now known. */ write32be(me.tos.ph_slen,aoutsymlist.nextindex * sizeof(struct nlist32) + aoutstrlist.nextoffset); /* set jmp_entry to move.l a_entry(pc),d0 jmp (-6,pc,d0.l) */ memcpy(me.jmp_entry,jmp_entry_code,sizeof(jmp_entry_code)); /* init a.out NMAGIC header */ SETMIDMAG(&me.aout,NMAGIC,0,0); write32be(me.aout.a_text,sections[0]->size+sections[0]->gapsize); write32be(me.aout.a_data,sections[1]?sections[1]->filesize:0); write32be(me.aout.a_bss,(sections[2]?sections[2]->size:0) + (sections[1]?sections[1]->gapsize:0)); write32be(me.aout.a_syms,aoutsymlist.nextindex*sizeof(struct nlist32)); write32be(me.aout.a_entry,TEXT_OFFSET); /* save offset to __stksize when symbol is present */ if (stksize = find_aout_sym("__stksize")) { write32be(me.stkpos, read32be(&stksize->n_value)+sizeof(me)-TEXT_OFFSET); } /* write a.out-MiNT header (256 bytes) */ fwritex(f,&me,sizeof(me)); /* write sections */ fwritex(f,sections[0]->data,sections[0]->size); fwritegap(f,sections[0]->gapsize); if (sections[1]) fwritex(f,sections[1]->data,sections[1]->filesize); /* write a.out symbols */ aout_writesymbols(f); aout_writestrings(f,be); /* write TPA relocs */ tparel_offset = ftell(f); tos_writerelocs(gv,f,sections); tparel_size = ftell(f) - tparel_offset; /* we have to patch tparel_pos and tparel_size in the header, as we didn't know about the size of the TPA relocs table before */ fseek(f,offsetof(struct mint_exec,tparel_pos),SEEK_SET); fwrite32be(f,tparel_offset); fwrite32be(f,tparel_size); }