2 // RMAC - Reboot's Macro Assembler for the Atari Jaguar Console System
3 // OBJECT.C - Writing Object Files
4 // Copyright (C) 199x Landon Dyer, 2017 Reboot and Friends
5 // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
6 // Source utilised with the kind permission of Landon Dyer
15 extern void m6502obj(int ofd);
19 uint32_t symsize = 0; // Size of BSD/ELF symbol table
20 uint32_t strindx = 0x00000004; // BSD/ELF string table index
21 uint8_t * strtable; // Pointer to the symbol string table
22 uint8_t * objImage; // Global object image pointer
23 int elfHdrNum[9] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
26 static uint16_t tdb_tab[] = {
28 AL_TEXT, // TEXT segment based
29 AL_DATA, 0, // DATA segment based
30 AL_BSS // BSS segment based
33 uint32_t PRGFLAGS; /* PRGFLAGS as defined in Atari Compendium Chapter 2
34 Definition Bit(s) Meaning
35 --------------- ------- --------------------------------------------------------
36 PF_FASTLOAD 0 If set, clear only the BSS area on program load,
37 otherwise clear the entire heap.
38 PF_TTRAMLOAD 1 If set, the program may be loaded into alternative RAM,
39 otherwise it must be loaded into standard RAM.
40 PF_TTRAMMEM 2 If set, the program's Malloc() requests may be satisfied
41 from alternative RAM, otherwise they must be satisfied
44 See left. 4 & 5 If these bits are set to 0 (PF_PRIVATE), the processes'
45 entire memory space will be considered private
46 (when memory protection is enabled).If these bits are
47 set to 1 (PF_GLOBAL), the processes' entire memory space
48 will be readable and writable by any process (i.e.
49 global). If these bits are set to 2 (PF_SUPERVISOR), the
50 processes' entire memory space will only be readable and
51 writable by itself and any other process in supervisor
52 mode.If these bits are set to 3 (PF_READABLE), the
53 processes' entire memory space will be readable by any
54 application but only writable by itself.
55 - 6-15 Currently unused
60 // Add entry to symbol table
61 // If 'globflag' is 1, make the symbol global
62 // If in .PRG mode, adjust symbol values for fake link
64 uint8_t * AddSymEntry(register uint8_t * buf, SYM * sym, int globflag)
66 // Copy symbol name to buffer (first 8 chars or less)
67 register uint8_t * s = sym->sname;
70 for(i=0; i<8 && *s; i++)
77 // Construct and deposit flag word
79 // o all symbols are AL_DEFINED
80 // o install T/D/B/A base
81 // o install 'equated'
82 // o commons (COMMON) are AL_EXTERN, but not BSS
83 // o exports (DEFINED) are AL_GLOBAL
84 // o imports (~DEFINED) are AL_EXTERN
86 register uint16_t w1 = sym->sattr;
87 register uint16_t w = AL_DEFINED | tdb_tab[w1 & TDB];
89 if (w1 & EQUATED) // Equated
94 w |= AL_EXTERN | AL_GLOBAL; // Common symbol
95 w &= ~AL_BSS; // They're not BSS in Alcyon object files
97 else if (w1 & DEFINED)
99 if (globflag) // Export the symbol
103 w |= AL_EXTERN; // Imported symbol
107 register uint32_t z = sym->svalue;
109 if (prg_flag) // Relocate value in .PRG segment
114 z += sect[TEXT].sloc;
117 z += sect[DATA].sloc;
120 SETBE32(buf, 0, z); // Deposit symbol value
128 // Add an entry to the BSD symbol table
130 uint8_t * AddBSDSymEntry(uint8_t * buf, SYM * sym, int globflag)
132 chptr = buf; // Point to buffer for depositing longs
133 D_long(strindx); // Deposit the symbol string index
135 uint16_t w1 = sym->sattr; // Obtain symbol attributes
136 uint32_t z = 0; // Initialize resulting symbol flags
140 z = 0x02000000; // Set equated flag
146 case TEXT: z = 0x04000000; break; // Set TEXT segment flag
147 case DATA: z = 0x06000000; break; // Set DATA segment flag
148 case BSS : z = 0x08000000; break; // Set BSS segment flag
153 z |= 0x01000000; // Set global flag if requested
155 D_long(z); // Deposit symbol attribute
156 z = sym->svalue; // Obtain symbol value
158 if (w1 & (DATA | BSS))
159 z += sect[TEXT].sloc; // If DATA or BSS add TEXT segment size
162 z += sect[DATA].sloc; // If BSS add DATA segment size
164 D_long(z); // Deposit symbol value
165 strcpy(strtable + strindx, sym->sname);
166 strindx += strlen(sym->sname) + 1; // Incr string index incl null terminate
167 buf += 12; // Increment buffer to next record
168 symsize += 12; // Increment symbol table size
175 // Add entry to ELF symbol table; if `globflag' is 1, make the symbol global
177 uint8_t * AddELFSymEntry(uint8_t * buf, SYM * sym, int globflag)
180 D_long(strindx); // st_name
181 D_long(sym->svalue); // st_value
182 D_long(0); // st_size
185 register WORD w1 = sym->sattr;
189 //w |= AL_EXTERN | AL_GLOBAL; // common symbol
190 //w &= ~AL_BSS; // they're not BSS in Alcyon object files
192 else if (w1 & DEFINED)
194 if (globflag) // Export the symbol
195 st_info |= 16; //STB_GLOBAL (1<<4)
197 else if (w1 & (GLOBAL | REFERENCED))
201 D_byte(0); // st_other
203 uint16_t st_shndx = 0xFFF1; // Assume absolute (equated) number
206 st_shndx = elfHdrNum[ES_TEXT];
208 st_shndx = elfHdrNum[ES_DATA];
210 st_shndx = elfHdrNum[ES_BSS];
212 st_shndx = 0; // Global, not absolute
216 strcpy(strtable + strindx, sym->sname);
217 strindx += strlen(sym->sname) + 1; // Incr string index incl null terminate
218 symsize += 0x10; // Increment symbol table size
225 // Helper function for ELF output
227 int DepositELFSectionHeader(uint8_t * ptr, uint32_t name, uint32_t type, uint32_t flags, uint32_t addr, uint32_t offset, uint32_t size, uint32_t link, uint32_t info, uint32_t addralign, uint32_t entsize)
245 // Deposit an entry in the Section Header string table
247 uint32_t DepositELFSHSTEntry(uint8_t ** pTable, const uint8_t * s)
250 printf("DepositELFSHSTEntry: s = \"%s\"\n", s);
252 uint32_t strSize = strlen(s);
254 *pTable += strSize + 1;
260 // Deposit a symbol table entry in the ELF Symbol Table
262 uint32_t DepositELFSymbol(uint8_t * ptr, uint32_t name, uint32_t addr, uint32_t size, uint8_t info, uint8_t other, uint16_t shndx)
276 // Write an object file to the passed in file descriptor
277 // N.B.: Return value is ignored...
279 int WriteObject(int fd)
281 LONG t; // Scratch long
282 LONG tds; // TEXT & DATA segment size
283 int i; // Temporary int
284 CHUNK * cp; // Chunk (for gather)
285 uint8_t * buf; // Scratch area
286 uint8_t * p; // Temporary ptr
287 LONG ssize; // Size of symbols
288 LONG trsize, drsize; // Size of relocations
289 long unused; // For supressing 'write' warnings
293 printf("TEXT segment: %d bytes\n", sect[TEXT].sloc);
294 printf("DATA segment: %d bytes\n", sect[DATA].sloc);
295 printf("BSS segment: %d bytes\n", sect[BSS].sloc);
298 // Write requested object file...
299 if ((obj_format == BSD) || ((obj_format == ALCYON) && (prg_flag == 0)))
301 // Force BSD format (if it was ALCYON format)
306 printf("Total : %d bytes\n", sect[TEXT].sloc + sect[DATA].sloc + sect[BSS].sloc);
309 ssize = sy_assign(NULL, NULL); // Assign index numbers to the symbols
310 tds = sect[TEXT].sloc + sect[DATA].sloc; // Get size of TEXT and DATA segment
311 buf = malloc(0x600000); // Allocate 6mb object file image memory
315 error("cannot allocate object file memory (in BSD mode)");
319 memset(buf, 0, 0x600000); // Clear allocated memory
320 objImage = buf; // Set global object image pointer
321 strtable = malloc(0x200000); // Allocate 2MB string table buffer
323 if (strtable == NULL)
325 error("cannot allocate string table memory (in BSD mode)");
329 memset(strtable, 0, 0x200000); // Clear allocated memory
331 // Build object file header
332 chptr = buf; // Base of header (for D_foo macros)
333 D_long(0x00000107); // Magic number
334 D_long(sect[TEXT].sloc); // TEXT size
335 D_long(sect[DATA].sloc); // DATA size
336 D_long(sect[BSS].sloc); // BSS size
337 D_long(0x00000000); // Symbol size
338 D_long(0x00000000); // First entry (0L)
339 D_long(0x00000000); // TEXT relocation size
340 D_long(0x00000000); // DATA relocation size
342 // Construct TEXT and DATA segments (without relocation changes)
343 p = buf + BSDHDRSIZE;
345 for(i=TEXT; i<=DATA; i++)
347 for(cp=sect[i].sfcode; cp!=NULL; cp=cp->chnext)
349 memcpy(p, cp->chptr, cp->ch_size);
354 // Do relocation tables (and make changes to segment data)
355 p = buf + BSDHDRSIZE + tds; // Move obj image ptr to reloc info
356 trsize = MarkBSDImage(p, tds, sect[TEXT].sloc, TEXT);// Do TEXT relocation table
357 chptr = buf + 0x18; // Point to relocation hdr entry
358 D_long(trsize); // Write the relocation table size
360 // Move obj image ptr to reloc info
361 p = buf + BSDHDRSIZE + tds + trsize;
362 drsize = MarkBSDImage(p, tds, sect[TEXT].sloc, DATA);// Do DATA relocation table
363 chptr = buf + 0x1C; // Point to relocation hdr entry
364 D_long(drsize); // Write the relocation table size
366 // Point to start of symbol table
367 p = buf + BSDHDRSIZE + tds + trsize + drsize;
368 sy_assign(p, AddBSDSymEntry); // Build symbol and string tables
369 chptr = buf + 0x10; // Point to sym table size hdr entry
370 D_long(symsize); // Write the symbol table size
372 // Point to string table
373 p = buf + BSDHDRSIZE + tds + trsize + drsize + symsize;
374 memcpy(p, strtable, strindx); // Copy string table to object image
375 chptr = p; // Point to string table size long
376 D_long(strindx); // Write string table size
378 // Write the BSD object file from the object image buffer
379 unused = write(fd, buf, BSDHDRSIZE + tds + trsize + drsize + symsize + strindx + 4);
383 printf("TextRel size: %d bytes\n", trsize);
384 printf("DataRel size: %d bytes\n", drsize);
389 free(strtable); // Free allocated memory
390 free(buf); // Free allocated memory
393 else if (obj_format == ALCYON)
399 printf("TOS header : 28 bytes\n");
400 printf("Total : %d bytes\n", 28 + sect[TEXT].sloc + sect[DATA].sloc + sect[BSS].sloc);
404 printf("Total : %d bytes\n", sect[TEXT].sloc + sect[DATA].sloc + sect[BSS].sloc);
408 // Compute size of symbol table; assign numbers to the symbols...
411 // As we grabbed BSD *and* Alcyon in prg_flag == 0 mode, this is *always*
414 ssize = sy_assign(NULL, NULL) * 14;
416 // Alloc memory for header + text + data, symbol and relocation
417 // information construction.
418 t = tds = sect[TEXT].sloc + sect[DATA].sloc;
423 // Is there any reason to do this this way???
424 buf = malloc(t + HDRSIZE);
427 // Build object file header just before the text+data image
428 chptr = buf - HDRSIZE; // -> base of header
429 D_word(0x601A); // 00 - magic number
430 D_long(sect[TEXT].sloc); // 02 - TEXT size
431 D_long(sect[DATA].sloc); // 06 - DATA size
432 D_long(sect[BSS].sloc); // 0A - BSS size
433 D_long(ssize); // 0E - symbol table size
434 D_long(0); // 12 - stack size (unused)
435 D_long(PRGFLAGS); // 16 - PRGFLAGS
436 D_word(0); // 1A - relocation information exists
438 // Construct text and data segments; fixup relocatable longs in .PRG
439 // mode; finally write the header + text + data
442 for(i=TEXT; i<=DATA; i++)
444 for(cp=sect[i].sfcode; cp!=NULL; cp=cp->chnext)
446 memcpy(p, cp->chptr, cp->ch_size);
451 // Do a first pass on the Alcyon image, if in PRG mode
453 MarkImage(buf, tds, sect[TEXT].sloc, 0);
455 unused = write(fd, buf - HDRSIZE, tds + HDRSIZE);
457 // Construct and write symbol table
460 sy_assign(buf, AddSymEntry);
461 unused = write(fd, buf, ssize);
464 // Construct and write relocation information; the size of it changes if
465 // we're writing a RELMODed executable.
466 tds = MarkImage(buf, tds, sect[TEXT].sloc, 1);
467 unused = write(fd, buf, tds);
469 else if (obj_format == ELF)
471 // Allocate 6MB object file image memory
472 buf = malloc(0x600000);
476 error("cannot allocate object file memory (in BSD mode)");
480 memset(buf, 0, 0x600000);
481 objImage = buf; // Set global object image pointer
482 strtable = malloc(0x200000); // Allocate 2MB string table buffer
484 if (strtable == NULL)
486 error("cannot allocate string table memory (in BSD mode)");
490 memset(strtable, 0, 0x200000);
492 // This is pretty much a first pass at this shite, so there's room for
494 uint8_t headers[4 * 10 * 10]; // (DWORD * 10) = 1 hdr, 10 entries
496 uint8_t shstrtab[128]; // The section header string table proper
497 uint32_t shstTab[9]; // Index into shstrtab for strings
498 uint8_t * shstPtr = shstrtab; // Temp pointer
499 uint32_t shstSize = 0;
500 int numEntries = 4; // There are always at *least* 4 sections
501 int shstIndex = 1; // The section where the shstrtab lives
502 int elfSize = 0; // Size of the ELF object
503 // Clear the header numbers
504 memset(elfHdrNum, 0, 9 * sizeof(int));
507 // First step is to see what sections need to be made; we also
508 // construct the section header string table here at the same time.
510 shstTab[ES_NULL] = shstSize;
511 shstSize += DepositELFSHSTEntry(&shstPtr, "");
512 shstTab[ES_SHSTRTAB] = shstSize;
513 shstSize += DepositELFSHSTEntry(&shstPtr, ".shstrtab");
514 shstTab[ES_SYMTAB] = shstSize;
515 shstSize += DepositELFSHSTEntry(&shstPtr, ".symtab");
516 shstTab[ES_STRTAB] = shstSize;
517 shstSize += DepositELFSHSTEntry(&shstPtr, ".strtab");
519 if (sect[TEXT].sloc > 0)
521 elfHdrNum[ES_TEXT] = shstIndex;
522 shstTab[ES_TEXT] = shstSize;
523 shstSize += DepositELFSHSTEntry(&shstPtr, "TEXT");
528 if (sect[DATA].sloc > 0)
530 elfHdrNum[ES_DATA] = shstIndex;
531 shstTab[ES_DATA] = shstSize;
532 shstSize += DepositELFSHSTEntry(&shstPtr, "DATA");
537 if (sect[BSS].sloc > 0)
539 elfHdrNum[ES_BSS] = shstIndex;
540 shstTab[ES_BSS] = shstSize;
541 shstSize += DepositELFSHSTEntry(&shstPtr, "BSS");
546 if (sect[TEXT].relocs > 0)
548 elfHdrNum[ES_RELATEXT] = shstIndex;
549 shstTab[ES_RELATEXT] = shstSize;
550 shstSize += DepositELFSHSTEntry(&shstPtr, ".relaTEXT");
555 if (sect[DATA].relocs > 0)
557 elfHdrNum[ES_RELADATA] = shstIndex;
558 shstTab[ES_RELADATA] = shstSize;
559 shstSize += DepositELFSHSTEntry(&shstPtr, ".relaDATA");
564 elfHdrNum[ES_SHSTRTAB] = shstIndex + 0;
565 elfHdrNum[ES_SYMTAB] = shstIndex + 1;
566 elfHdrNum[ES_STRTAB] = shstIndex + 2;
569 printf("ELF shstrtab size: %i bytes. Entries:\n", shstSize);
570 for(int j=0; j<i; j++)
571 printf("\"%s\"\n", shstrtab + shstTab[j]);
574 // Construct ELF header
575 // If you want to make any sense out of this you'd better take a look
576 // at Executable and Linkable Format on Wikipedia.
578 D_long(0x7F454C46); // 00 - "<7F>ELF" Magic Number
579 D_byte(0x01); // 04 - 32 vs 64 (1 = 32, 2 = 64)
580 D_byte(0x02); // 05 - Endianness (1 = LE, 2 = BE)
581 D_byte(0x01); // 06 - Original version of ELF (set to 1)
582 D_byte(0x00); // 07 - Target OS ABI (0 = System V)
583 D_byte(0x00); // 08 - ABI Extra (unneeded)
584 D_byte(0x00); // 09 - Pad bytes
587 D_word(0x01); // 10 - ELF Type (1 = relocatable)
588 D_word(0x04); // 12 - Architecture (EM_68K = 4, Motorola M68K family)
589 D_long(0x01); // 14 - Version (1 = original ELF)
590 D_long(0x00); // 18 - Entry point virtual address (unneeded)
591 D_long(0x00); // 1C - Program header table offset (unneeded)
592 D_long(0x00); // 20 - Section header table offset (to be determined)
596 // Specifically for 68000 CPU
597 D_long(0x01000000) // 24 - Processor-specific flags - EF_M68K_M68000
601 // CPUs other than 68000 (68020...)
602 D_long(0); // 24 - Processor-specific flags (ISA dependent)
605 D_word(0x0034); // 28 - ELF header size in bytes
606 D_word(0); // 2A - Program header table entry size
607 D_word(0); // 2C - Program header table entry count
608 D_word(0x0028); // 2E - Section header entry size - 40 bytes for ELF32
609 D_word(numEntries); // 30 - Section header table entry count
610 D_word(shstIndex); // 32 - Section header string table index
614 // Deposit section header 0 (NULL)
615 headerSize += DepositELFSectionHeader(headers + headerSize, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
617 int textLoc = elfSize;
619 // Construct TEXT section, if any
620 if (sect[TEXT].sloc > 0)
622 headerSize += DepositELFSectionHeader(headers + headerSize, shstTab[ES_TEXT], 1, 6, 0, elfSize, sect[TEXT].sloc, 0, 0, 2, 0);
624 for(CHUNK * cp=sect[TEXT].sfcode; cp!=NULL; cp=cp->chnext)
626 memcpy(buf + elfSize, cp->chptr, cp->ch_size);
627 elfSize += cp->ch_size;
630 // Pad for next section (LONG boundary)
631 elfSize = (elfSize + 3) & ~3;
634 int dataLoc = elfSize;
636 // Construct DATA section, if any
637 if (sect[DATA].sloc > 0)
639 headerSize += DepositELFSectionHeader(headers + headerSize, shstTab[ES_DATA], 1, 3, 0, elfSize, sect[DATA].sloc, 0, 0, 1, 0);
641 for(CHUNK * cp=sect[DATA].sfcode; cp!=NULL; cp=cp->chnext)
643 memcpy(buf + elfSize, cp->chptr, cp->ch_size);
644 elfSize += cp->ch_size;
647 // Pad for next section (LONG boundary)
648 elfSize = (elfSize + 3) & ~3;
651 // Construct BSS section, if any
652 if (sect[BSS].sloc > 0)
654 headerSize += DepositELFSectionHeader(headers + headerSize, shstTab[ES_BSS], 8, 3, 0, elfSize, sect[BSS].sloc, 0, 0, 2, 0);
657 int textrelLoc = headerSize;
659 // Add headers for relocated sections, if any...
660 if (sect[TEXT].relocs > 0)
661 headerSize += DepositELFSectionHeader(headers + headerSize, shstTab[ES_RELATEXT], 4, 0x00, 0, 0, 0, elfHdrNum[ES_SYMTAB], elfHdrNum[ES_TEXT], 4, 0x0C);
663 int datarelLoc = headerSize;
665 if (sect[DATA].relocs > 0)
666 headerSize += DepositELFSectionHeader(headers + headerSize, shstTab[ES_RELADATA], 4, 0x40, 0, 0, 0, elfHdrNum[ES_SYMTAB], elfHdrNum[ES_DATA], 4, 0x0C);
669 headerSize += DepositELFSectionHeader(headers + headerSize, shstTab[ES_SHSTRTAB], 3, 0, 0, elfSize, shstSize, 0, 0, 1, 0);
670 memcpy(buf + elfSize, shstrtab, shstSize);
672 // Pad for next section (LONG boundary)
673 elfSize = (elfSize + 3) & ~3;
675 // Add section headers
676 int headerLoc = elfSize;
677 chptr = buf + 0x20; // Set section header offset in ELF header
679 elfSize += (4 * 10) * numEntries;
681 // Add symbol table & string table
682 int symtabLoc = elfSize;
683 strindx = 0; // Make sure we start at the beginning...
684 elfSize += DepositELFSymbol(buf + elfSize, 0, 0, 0, 0, 0, 0);
689 if (sect[TEXT].sloc > 0)
691 elfSize += DepositELFSymbol(buf + elfSize, 0, 0, 0, 3, 0, elfHdrNum[ES_TEXT]);
695 if (sect[DATA].sloc > 0)
697 elfSize += DepositELFSymbol(buf + elfSize, 0, 0, 0, 3, 0, elfHdrNum[ES_DATA]);
701 if (sect[BSS].sloc > 0)
703 elfSize += DepositELFSymbol(buf + elfSize, 0, 0, 0, 3, 0, elfHdrNum[ES_BSS]);
707 int numSymbols = sy_assign_ELF(buf + elfSize, AddELFSymEntry);
708 elfSize += numSymbols * 0x10;
711 int strtabLoc = elfSize;
712 memcpy(buf + elfSize, strtable, strindx);
714 // Pad for next section (LONG boundary)
715 elfSize = (elfSize + 3) & ~3;
717 headerSize += DepositELFSectionHeader(headers + headerSize, shstTab[ES_SYMTAB], 2, 0, 0, symtabLoc, (numSymbols + extraSyms) * 0x10, shstIndex + 2, firstglobal + extraSyms, 4, 0x10);
718 headerSize += DepositELFSectionHeader(headers + headerSize, shstTab[ES_STRTAB], 3, 0, 0, strtabLoc, strindx, 0, 0, 1, 0);
720 // Add relocation tables, if any (no need to align after these, they're
721 // already on DWORD boundaries)
722 if (sect[TEXT].relocs > 0)
724 uint32_t textrelSize = CreateELFRelocationRecord(buf + elfSize, buf + textLoc, TEXT);
725 // Deposit offset & size, now that we know them
726 chptr = headers + textrelLoc + 0x10;
729 elfSize += textrelSize;
732 if (sect[DATA].relocs > 0)
734 uint32_t datarelSize = CreateELFRelocationRecord(buf + elfSize, buf + dataLoc, DATA);
735 // Deposit offset & size, now that we know them
736 chptr = headers + datarelLoc + 0x10;
739 elfSize += datarelSize;
742 // Copy headers into the object
743 memcpy(buf + headerLoc, headers, headerSize);
745 // Finally, write out the object
746 unused = write(fd, buf, elfSize);
748 // Free allocated memory
755 else if (obj_format == XEX)
757 // Just write the object file