[rmac] / object.c

//
// RMAC - Renamed Macro Assembler for all Atari computers
// OBJECT.C - Writing Object Files
// Copyright (C) 199x Landon Dyer, 2011-2022 Reboot and Friends
// RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
// Source utilised with the kind permission of Landon Dyer
//

#include "object.h"
#include "6502.h"
#include "direct.h"
#include "dsp56k.h"
#include "error.h"
#include "mark.h"
#include "riscasm.h"
#include "sect.h"
#include "symbol.h"
#include "version.h"

//#define DEBUG_ELF

uint32_t symsize = 0;                   // Size of BSD/ELF symbol table
uint32_t strindx = 0x00000004;  // BSD/ELF string table index
uint8_t * strtable;                             // Pointer to the symbol string table
uint8_t * objImage;                             // Global object image pointer
int elfHdrNum[9] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
uint32_t extraSyms;

static uint16_t tdb_tab[] = {
        0,                              // absolute
        AL_TEXT,                // TEXT segment based
        AL_DATA, 0,             // DATA segment based
        AL_BSS                  // BSS segment based
};

uint32_t PRGFLAGS;      /* PRGFLAGS as defined in Atari Compendium Chapter 2
Definition              Bit(s)  Meaning
--------------- ------- --------------------------------------------------------
PF_FASTLOAD             0               If set, clear only the BSS area on program load,
                                                otherwise clear the entire heap.
PF_TTRAMLOAD    1               If set, the program may be loaded into alternative RAM,
                                                otherwise it must be loaded into standard RAM.
PF_TTRAMMEM             2               If set, the program's Malloc() requests may be satisfied
                                                from alternative RAM, otherwise they must be satisfied
                                                from standard RAM.
-                               3               Currently unused
See left.               4 & 5   If these bits are set to 0 (PF_PRIVATE), the processes'
                                                entire memory space will be considered private
                                                (when memory protection is enabled).If these bits are
                                                set to 1 (PF_GLOBAL), the processes' entire memory space
                                                will be readable and writable by any process (i.e.
                                                global). If these bits are set to 2 (PF_SUPERVISOR), the
                                                processes' entire memory space will only be readable and
                                                writable by itself and any other process in supervisor
                                                mode.If these bits are set to 3 (PF_READABLE), the
                                                processes' entire memory space will be readable by any
                                                application but only writable by itself.
-                               6-15    Currently unused
*/

// Internal function prototypes
static void WriteLOD(void);
static void WriteP56(void);

//
// Add entry to symbol table (in ALCYON mode)
// If 'globflag' is 1, make the symbol global
// If in .PRG mode, adjust symbol values for fake link
//
uint8_t * AddSymEntry(register uint8_t * buf, SYM * sym, int globflag)
{
        // Copy symbol name to buffer (first 8 chars or less)
        register uint8_t * s = sym->sname;
        register int i;
        uint32_t extra = 0;

        for(i=0; i<8 && *s; i++)
                *buf++ = *s++;

        while (i++ < 8)
                *buf++ = '\0';

        register uint16_t w1 = sym->sattr;
        register uint16_t w = AL_DEFINED | tdb_tab[w1 & TDB];

        if (prg_flag == 3)
        {
                // Extended symbol - Check to see if symbol is larger than 8 characters
                // and write an extra 14 characters where the next symbol would be.
                // Modify the flag word for this
                if (*s)
                {
                        //printf("%s '%i' - will write extended symbol\n", sym->sname,s[0]);
                        uint8_t *buf2 = buf + 6;

                        for(i=8; i<8+14 && *s; i++)
                                *buf2++ = *s++;

                        while (i++ < 8 + 14)
                                *buf2++ = '\0';

                        symsize += 14;
                        w |= 0x48;
                        extra = 14;
                }
        }

        //
        // Construct and deposit flag word
        //
        // o  all symbols are AL_DEFINED
        // o  install T/D/B/A base
        //   o  install 'equated'
        //   o  commons (COMMON) are AL_EXTERN, but not BSS
        // o  exports (DEFINED) are AL_GLOBAL
        // o  imports (~DEFINED) are AL_EXTERN
        //
        if (w1 & EQUATED)               // Equated
                w |= AL_EQUATED;

        if (w1 & COMMON)
        {
                w |= AL_EXTERN | AL_GLOBAL;     // Common symbol
                w &= ~AL_BSS;           // They're not BSS in Alcyon object files
        }

        if (w1 & DEFINED)
        {
                if (globflag)           // Export the symbol
                        w |= AL_GLOBAL;
        }
        else
                w |= AL_EXTERN;         // Imported symbol

        SETBE16(buf, 0, w);
        buf += 2;
        register uint32_t z = (uint32_t)sym->svalue;

        if (prg_flag)                   // Relocate value in .PRG segment
        {
                w1 &= DATA | BSS;

                if (w1)
                        z += sect[TEXT].sloc;

                if (w1 & BSS)
                        z += sect[DATA].sloc;
        }

        SETBE32(buf, 0, z);             // Deposit symbol value
        buf += 4;

        symsize += 14;
        buf += extra;

        return buf;
}

//
// Add an entry to the BSD symbol table
//
// From stab.def (https://sites.uclouvain.be/SystInfo/usr/include/bits/stab.def.html):
/*
_________________________________________________
| 00 - 1F are not dbx stab symbols              |
| In most cases, the low bit is the EXTernal bit|

| 00 UNDEF  | 02 ABS    | 04 TEXT   | 06 DATA   |
| 01  |EXT  | 03  |EXT  | 05  |EXT  | 07  |EXT  |

| 08 BSS    | 0A INDR   | 0C FN_SEQ | 0E WEAKA  |
| 09  |EXT  | 0B        | 0D WEAKU  | 0F WEAKT  |

| 10 WEAKD  | 12 COMM   | 14 SETA   | 16 SETT   |
| 11 WEAKB  | 13        | 15        | 17        |

| 18 SETD   | 1A SETB   | 1C SETV   | 1E WARNING|
| 19        | 1B        | 1D        | 1F FN     |
*/
uint8_t * AddBSDSymEntry(uint8_t * buf, SYM * sym, int globflag)
{
        chptr = buf;                                            // Point to buffer for depositing longs
        if (sym->sname)
        {
                D_long(strindx);                                // Deposit the symbol string index
        }
    else
        {
                D_long(0);                                              // Deposit special NULL string index
        }

        uint16_t w1 = sym->sattr;                       // Obtain symbol attributes
        uint32_t z = 0;                                         // Initialize resulting symbol flags

        if (sym->stype == DBGSYM)
        {
                // Debug symbols hard-code the a.out symbol type in the st_type field
                // and can include additional type-specific data in the a.out symbol
                // "other" and "description" fields, both packed into this same dword.
                z = sym->st_type << 24;
                z |= sym->st_other << 16;
                z |= sym->st_desc;
        }
        else
        {
                // Translate rmac symbol attributes to an a.out symbol type.
                if (w1 & EQUATED)
                {
                        z = 0x02000000;                                 // Set equated flag
                }

                // If a symbol is both EQUd and flagged as TBD then we let the latter
                // take precedence. Otherwise the linker will not even bother trying to
                // relocate the address during link time.

                switch (w1 & TDB)
                {
                case TEXT: z = 0x04000000; break;       // Set TEXT segment flag
                case DATA: z = 0x06000000; break;       // Set DATA segment flag
                case BSS : z = 0x08000000; break;       // Set BSS segment flag
                }

                if (globflag)
                        z |= 0x01000000;                                // Set global flag if requested
        }

        D_long(z);                                                      // Deposit symbol attribute
        z = sym->svalue;                                        // Obtain symbol value

        if (w1 & (DATA | BSS))
                z += sect[TEXT].sloc;                   // If DATA or BSS add TEXT segment size

        if (w1 & BSS)
                z += sect[DATA].sloc;                   // If BSS add DATA segment size

        D_long(z);                                                      // Deposit symbol value
        if (sym->sname)
        {
                strcpy(strtable + strindx, sym->sname);
                strindx += strlen(sym->sname) + 1;      // Incr string index incl null terminate
        }
        buf += 12;                                                      // Increment buffer to next record
        symsize += 12;                                          // Increment symbol table size

        return buf;
}

//
// Add entry to ELF symbol table; if `globflag' is 1, make the symbol global
//
uint8_t * AddELFSymEntry(uint8_t * buf, SYM * sym, int globflag)
{
        chptr = buf;
        ch_size = 0;
        D_long(strindx);                // st_name
        D_long(sym->svalue);    // st_value
        D_long(0);                              // st_size
        uint8_t st_info = 0;

        register WORD w1 = sym->sattr;

        if (w1 & DEFINED)
        {
                if (globflag)           // Export the symbol
                        st_info |= 16;  // STB_GLOBAL (1<<4)
        }
        else if (w1 & (GLOBAL | REFERENCED))
                st_info |= 16;

        D_byte(st_info);
        D_byte(0);                              // st_other

        uint16_t st_shndx = SHN_ABS;    // Assume absolute (equated) number

        if (w1 & TEXT)
                st_shndx = elfHdrNum[ES_TEXT];
        else if (w1 & DATA)
                st_shndx = elfHdrNum[ES_DATA];
        else if (w1 & BSS)
                st_shndx = elfHdrNum[ES_BSS];
        else if (globflag && !(w1 & DEFINED) && (w1 & REFERENCED))
        {
                st_shndx = SHN_UNDEF;
        }                                      // If the symbol is global then probably we
                                    // don't need to do anything (probably)
                                    // since we set STB_GLOBAL in st_info above.
                                    // Unless we need to set it to SHN_COMMON?

        D_word(st_shndx);

        strcpy(strtable + strindx, sym->sname);
        strindx += strlen(sym->sname) + 1;      // Incr string index incl null terminate
        symsize += 0x10;                                        // Increment symbol table size

        return buf + 0x10;
}

//
// Helper function for ELF output
//
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)
{
        chptr = ptr;
        ch_size = 0;
        D_long(name);
        D_long(type);
        D_long(flags);
        D_long(addr);
        D_long(offset);
        D_long(size);
        D_long(link);
        D_long(info);
        D_long(addralign);
        D_long(entsize);
        return 40;
}

//
// Deposit an entry in the Section Header string table
//
uint32_t DepositELFSHSTEntry(uint8_t ** pTable, const uint8_t * s)
{
#ifdef DEBUG_ELF
printf("DepositELFSHSTEntry: s = \"%s\"\n", s);
#endif
        uint32_t strSize = strlen(s);
        strcpy(*pTable, s);
        *pTable += strSize + 1;
        return strSize + 1;
}

//
// Deposit a symbol table entry in the ELF Symbol Table
//
uint32_t DepositELFSymbol(uint8_t * ptr, uint32_t name, uint32_t addr, uint32_t size, uint8_t info, uint8_t other, uint16_t shndx)
{
        chptr = ptr;
        ch_size = 0;
        D_long(name);
        D_long(addr);
        D_long(size);
        *chptr++ = info;
        *chptr++ = other;
        D_word(shndx);
        return 16;
}

//
// Write an object file to the passed in file descriptor
// N.B.: Return value is ignored...
//
int WriteObject(int fd)
{
        LONG tds;                               // TEXT & DATA segment size
        int i;                                  // Temporary int
        CHUNK * cp;                             // Chunk (for gather)
        uint8_t * buf;                  // Scratch area
        uint8_t * p;                    // Temporary ptr
        LONG trsize, drsize;    // Size of relocations
        uint32_t unused;                // For supressing 'write' warnings

        if (verb_flag)
        {
                printf("TEXT segment: %d bytes\n", sect[TEXT].sloc);
                printf("DATA segment: %d bytes\n", sect[DATA].sloc);
                printf("BSS  segment: %d bytes\n", sect[BSS].sloc);
        }

        // Write requested object file...
        if ((obj_format == BSD) || ((obj_format == ALCYON) && (prg_flag == 0)))
        {
                ch_size = 0;

                // Force BSD format (if it was ALCYON format)
                obj_format = BSD;

                if (verb_flag)
                {
                        printf("Total       : %d bytes\n", sect[TEXT].sloc + sect[DATA].sloc + sect[BSS].sloc);
                }

                AssignSymbolNos(NULL, NULL);    // Assign index numbers to the symbols
                tds = sect[TEXT].sloc + sect[DATA].sloc;        // Get size of TEXT and DATA segment
                buf = malloc(0x800000);                 // Allocate 8MB object file image memory

                if (buf == NULL)
                {
                        error("cannot allocate object file memory (in BSD mode)");
                        return ERROR;
                }

                memset(buf, 0, 0x800000);               // Clear allocated memory
                objImage = buf;                                 // Set global object image pointer
                strtable = malloc(0x200000);    // Allocate 2MB string table buffer

                if (strtable == NULL)
                {
                        free(buf);
                        error("cannot allocate string table memory (in BSD mode)");
                        return ERROR;
                }

                memset(strtable, 0, 0x200000);  // Clear allocated memory

                // Build object file header
                chptr = buf;                                    // Base of header (for D_foo macros)
                ch_size = 0;
                challoc = 0x800000;
                D_long(0x00000107);                             // Magic number
                D_long(sect[TEXT].sloc);                // TEXT size
                D_long(sect[DATA].sloc);                // DATA size
                D_long(sect[BSS].sloc);                 // BSS size
                D_long(0x00000000);                             // Symbol size
                D_long(0x00000000);                             // First entry (0L)
                D_long(0x00000000);                             // TEXT relocation size
                D_long(0x00000000);                             // DATA relocation size

                // Construct TEXT and DATA segments (without relocation changes)
                p = buf + BSDHDRSIZE;

                for(i=TEXT; i<=DATA; i++)
                {
                        for(cp=sect[i].sfcode; cp!=NULL; cp=cp->chnext)
                        {
                                memcpy(p, cp->chptr, cp->ch_size);
                                p += cp->ch_size;
                        }
                }

                // Do relocation tables (and make changes to segment data)
                p = buf + BSDHDRSIZE + tds;             // Move obj image ptr to reloc info
                trsize = MarkBSDImage(p, tds, sect[TEXT].sloc, TEXT);// Do TEXT relocation table
                chptr = buf + 0x18;                             // Point to relocation hdr entry
                D_long(trsize);                                 // Write the relocation table size

                // Move obj image ptr to reloc info
                p = buf + BSDHDRSIZE + tds + trsize;
                drsize = MarkBSDImage(p, tds, sect[TEXT].sloc, DATA);// Do DATA relocation table
                chptr = buf + 0x1C;                             // Point to relocation hdr entry
                D_long(drsize);                                 // Write the relocation table size

                // Point to start of symbol table
                p = buf + BSDHDRSIZE + tds + trsize + drsize;
                AssignSymbolNos(p, AddBSDSymEntry);     // Build symbol and string tables
                chptr = buf + 0x10;                             // Point to sym table size hdr entry
                D_long(symsize);                                // Write the symbol table size

                // Point to string table
                p = buf + BSDHDRSIZE + tds + trsize + drsize + symsize;
                memcpy(p, strtable, strindx);   // Copy string table to object image
                chptr = p;                                              // Point to string table size long
                D_long(strindx);                                // Write string table size

                // Write the BSD object file from the object image buffer
                unused = write(fd, buf, BSDHDRSIZE + tds + trsize + drsize + symsize + strindx + 4);

                if (verb_flag)
                {
                        printf("TextRel size: %d bytes\n", trsize);
                        printf("DataRel size: %d bytes\n", drsize);
                }

                if (buf)
                {
                        free(strtable);                         // Free allocated memory
                        free(buf);                                      // Free allocated memory
                }
        }
        else if (obj_format == ALCYON)
        {
                ch_size = 0;

                if (verb_flag)
                {
                        if (prg_flag)
                                printf("TOS header  : 28 bytes\n");

                        printf("Total       : %d bytes\n", sect[TEXT].sloc + sect[DATA].sloc + sect[BSS].sloc + (prg_flag ? 28 : 0));
                }

                // Assign index numbers to the symbols, get # of symbols (we assume
                // that all symbols can potentially be extended, hence the x28)
                // (To clarify: 28 bytes is the size of an extended symbol)
                uint32_t symbolMaxSize = AssignSymbolNos(NULL, NULL) * 28;

                // Alloc memory for header + text + data, symbol and relocation
                // information construction.
                tds = sect[TEXT].sloc + sect[DATA].sloc;
                buf = malloc(HDRSIZE + tds + symbolMaxSize);

                // Build object file header just before the text+data image
                chptr = buf;                            // -> base of header
                ch_size = 0;
                challoc = HDRSIZE + tds + symbolMaxSize;
                D_word(0x601A);                         // 00 - magic number
                D_long(sect[TEXT].sloc);        // 02 - TEXT size
                D_long(sect[DATA].sloc);        // 06 - DATA size
                D_long(sect[BSS].sloc);         // 0A - BSS size
                D_long(0);                                      // 0E - symbol table size (filled later)
                D_long(0);                                      // 12 - stack size (unused)
                D_long(PRGFLAGS);                       // 16 - PRGFLAGS
                D_word(0);                                      // 1A - relocation information exists

                // Construct text and data segments; fixup relocatable longs in .PRG
                // mode; finally write the header + text + data
                p = buf + HDRSIZE;

                for(i=TEXT; i<=DATA; i++)
                {
                        for(cp=sect[i].sfcode; cp!=NULL; cp=cp->chnext)
                        {
                                memcpy(p, cp->chptr, cp->ch_size);
                                p += cp->ch_size;
                        }
                }

                // Do a first pass on the Alcyon image, if in PRG mode
                if (prg_flag)
                        MarkImage(buf + HDRSIZE, tds, sect[TEXT].sloc, 0);

                // Construct symbol table and update the header entry, if necessary
                if (prg_flag > 1)
                {
                        // AssignSymbolNos with AddSymEntry updates symsize (stays 0 otherwise)
                        AssignSymbolNos(buf + HDRSIZE + tds, AddSymEntry);
                        chptr = buf + 0x0E;                     // Point to symbol table size entry
                        D_long(symsize);

                        if (verb_flag)
                                printf("Symbol table: %d bytes\n", symsize);
                }

                // Write out the header + text & data + symbol table (if any)
                unused = write(fd, buf, HDRSIZE + tds + symsize);

                // Construct and write relocation information; the size of it changes if
                // we're writing a RELMODed executable. N.B.: Destroys buffer!
                tds = MarkImage(buf, tds, sect[TEXT].sloc, 1);
                unused = write(fd, buf, tds);
        }
        else if (obj_format == ELF)
        {
                // Allocate 6MB object file image memory
                buf = malloc(0x600000);

                if (buf == NULL)
                {
                        error("cannot allocate object file memory (in ELF mode)");
                        return ERROR;
                }

                memset(buf, 0, 0x600000);
                objImage = buf;                                 // Set global object image pointer
                strtable = malloc(0x200000);    // Allocate 2MB string table buffer

                if (strtable == NULL)
                {
                        error("cannot allocate string table memory (in ELF mode)");
                        return ERROR;
                }

                memset(strtable, 0, 0x200000);

                // This is pretty much a first pass at this shite, so there's room for
                // improvement. :-P
                uint8_t headers[4 * 10 * 10];   // (DWORD * 10) = 1 hdr, 10 entries
                int headerSize = 0;
                uint8_t shstrtab[128];                  // The section header string table proper
                uint32_t shstTab[9];                    // Index into shstrtab for strings
                uint8_t * shstPtr = shstrtab;   // Temp pointer
                uint32_t shstSize = 0;
                int numEntries = 4;                             // There are always at *least* 4 sections
                int shstIndex = 1;                              // The section where the shstrtab lives
                int elfSize = 0;                                // Size of the ELF object
                // Clear the header numbers
                memset(elfHdrNum, 0, 9 * sizeof(int));

                //
                // First step is to see what sections need to be made; we also
                // construct the section header string table here at the same time.
                //
                shstTab[ES_NULL] = shstSize;
                shstSize += DepositELFSHSTEntry(&shstPtr, "");
                shstTab[ES_SHSTRTAB] = shstSize;
                shstSize += DepositELFSHSTEntry(&shstPtr, ".shstrtab");
                shstTab[ES_SYMTAB] = shstSize;
                shstSize += DepositELFSHSTEntry(&shstPtr, ".symtab");
                shstTab[ES_STRTAB] = shstSize;
                shstSize += DepositELFSHSTEntry(&shstPtr, ".strtab");

                if (sect[TEXT].sloc > 0)
                {
                        elfHdrNum[ES_TEXT] = shstIndex;
                        shstTab[ES_TEXT] = shstSize;
                        shstSize += DepositELFSHSTEntry(&shstPtr, ".text");
                        shstIndex++;
                        numEntries++;
                }

                if (sect[DATA].sloc > 0)
                {
                        elfHdrNum[ES_DATA] = shstIndex;
                        shstTab[ES_DATA] = shstSize;
                        shstSize += DepositELFSHSTEntry(&shstPtr, ".data");
                        shstIndex++;
                        numEntries++;
                }

                if (sect[BSS].sloc > 0)
                {
                        elfHdrNum[ES_BSS] = shstIndex;
                        shstTab[ES_BSS] = shstSize;
                        shstSize += DepositELFSHSTEntry(&shstPtr, ".bss");
                        shstIndex++;
                        numEntries++;
                }

                if (sect[TEXT].relocs > 0)
                {
                        elfHdrNum[ES_RELATEXT] = shstIndex;
                        shstTab[ES_RELATEXT] = shstSize;
                        shstSize += DepositELFSHSTEntry(&shstPtr, ".relaTEXT");
                        shstIndex++;
                        numEntries++;
                }

                if (sect[DATA].relocs > 0)
                {
                        elfHdrNum[ES_RELADATA] = shstIndex;
                        shstTab[ES_RELADATA] = shstSize;
                        shstSize += DepositELFSHSTEntry(&shstPtr, ".relaDATA");
                        shstIndex++;
                        numEntries++;
                }

                elfHdrNum[ES_SHSTRTAB] = shstIndex + 0;
                elfHdrNum[ES_SYMTAB]   = shstIndex + 1;
                elfHdrNum[ES_STRTAB]   = shstIndex + 2;

#ifdef DEBUG_ELF
printf("ELF shstrtab size: %i bytes. Entries:\n", shstSize);
for(int j=0; j<i; j++)
        printf("\"%s\"\n", shstrtab + shstTab[j]);
#endif

                // Construct ELF header
                // If you want to make any sense out of this you'd better take a look
                // at Executable and Linkable Format on Wikipedia.
                chptr = buf;
                ch_size = 0;
                challoc = 0x600000;
                D_long(0x7F454C46); // 00 - "<7F>ELF" Magic Number
                D_byte(0x01); // 04 - 32 vs 64 (1 = 32, 2 = 64)
                D_byte(0x02); // 05 - Endianness (1 = LE, 2 = BE)
                D_byte(0x01); // 06 - Original version of ELF (set to 1)
                D_byte(0x00); // 07 - Target OS ABI (0 = System V)
                D_byte(0x00); // 08 - ABI Extra (unneeded)
                D_byte(0x00); // 09 - Pad bytes
                D_word(0x00);
                D_long(0x00);
                D_word(0x01); // 10 - ELF Type (1 = relocatable)
                D_word(0x04); // 12 - Architecture (EM_68K = 4, Motorola M68K family)
                D_long(0x01); // 14 - Version (1 = original ELF)
                D_long(0x00); // 18 - Entry point virtual address (unneeded)
                D_long(0x00); // 1C - Program header table offset (unneeded)
                D_long(0x00); // 20 - Section header table offset (to be determined)

                if (0)
                {
                        // Specifically for 68000 CPU
                        D_long(0x01000000) // 24 - Processor-specific flags - EF_M68K_M68000
                }
                else
                {
                        // CPUs other than 68000 (68020...)
                        D_long(0); // 24 - Processor-specific flags (ISA dependent)
                }

                D_word(0x0034); // 28 - ELF header size in bytes
                D_word(0); // 2A - Program header table entry size
                D_word(0); // 2C - Program header table entry count
                D_word(0x0028); // 2E - Section header entry size - 40 bytes for ELF32
                D_word(numEntries); // 30 - Section header table entry count
                D_word(shstIndex); // 32 - Section header string table index

                elfSize += 0x34;

                // Deposit section header 0 (NULL)
                headerSize += DepositELFSectionHeader(headers + headerSize, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);

                int textLoc = elfSize;

                // Construct TEXT section, if any
                if (sect[TEXT].sloc > 0)
                {
                        headerSize += DepositELFSectionHeader(headers + headerSize, shstTab[ES_TEXT], 1, 6, 0, elfSize, sect[TEXT].sloc, 0, 0, largestAlign[0], 0);

                        for(CHUNK * cp=sect[TEXT].sfcode; cp!=NULL; cp=cp->chnext)
                        {
                                memcpy(buf + elfSize, cp->chptr, cp->ch_size);
                                elfSize += cp->ch_size;
                        }

                        // Pad for next section (LONG boundary)
                        elfSize = (elfSize + 3) & ~3;
                }

                int dataLoc = elfSize;

                // Construct DATA section, if any
                if (sect[DATA].sloc > 0)
                {
                        headerSize += DepositELFSectionHeader(headers + headerSize, shstTab[ES_DATA], 1, 3, 0, elfSize, sect[DATA].sloc, 0, 0, largestAlign[1], 0);

                        for(CHUNK * cp=sect[DATA].sfcode; cp!=NULL; cp=cp->chnext)
                        {
                                memcpy(buf + elfSize, cp->chptr, cp->ch_size);
                                elfSize += cp->ch_size;
                        }

                        // Pad for next section (LONG boundary)
                        elfSize = (elfSize + 3) & ~3;
                }

                // Construct BSS section, if any
                if (sect[BSS].sloc > 0)
                {
                        headerSize += DepositELFSectionHeader(headers + headerSize, shstTab[ES_BSS], 8, 3, 0, elfSize, sect[BSS].sloc, 0, 0, largestAlign[2], 0);
                }

                int textrelLoc = headerSize;

                // Add headers for relocated sections, if any...
                if (sect[TEXT].relocs > 0)
                        headerSize += DepositELFSectionHeader(headers + headerSize, shstTab[ES_RELATEXT], 4, 0x00, 0, 0, 0, elfHdrNum[ES_SYMTAB], elfHdrNum[ES_TEXT], 4, 0x0C);

                int datarelLoc = headerSize;

                if (sect[DATA].relocs > 0)
                        headerSize += DepositELFSectionHeader(headers + headerSize, shstTab[ES_RELADATA], 4, 0x40, 0, 0, 0, elfHdrNum[ES_SYMTAB], elfHdrNum[ES_DATA], 4, 0x0C);

                // Add shstrtab
                headerSize += DepositELFSectionHeader(headers + headerSize, shstTab[ES_SHSTRTAB], 3, 0, 0, elfSize, shstSize, 0, 0, 1, 0);
                memcpy(buf + elfSize, shstrtab, shstSize);
                elfSize += shstSize;
                // Pad for next section (LONG boundary)
                elfSize = (elfSize + 3) & ~3;

                // Add section headers
                int headerLoc = elfSize;
                chptr = buf + 0x20;             // Set section header offset in ELF header
                D_long(headerLoc);
                elfSize += (4 * 10) * numEntries;

                // Add symbol table & string table
                int symtabLoc = elfSize;
                strindx = 0;    // Make sure we start at the beginning...
                elfSize += DepositELFSymbol(buf + elfSize, 0, 0, 0, 0, 0, 0);
                *strtable = 0;
                strindx++;
                extraSyms = 1;

                if (sect[TEXT].sloc > 0)
                {
                        elfSize += DepositELFSymbol(buf + elfSize, 0, 0, 0, 3, 0, elfHdrNum[ES_TEXT]);
                        extraSyms++;
                }

                if (sect[DATA].sloc > 0)
                {
                        elfSize += DepositELFSymbol(buf + elfSize, 0, 0, 0, 3, 0, elfHdrNum[ES_DATA]);
                        extraSyms++;
                }

                if (sect[BSS].sloc > 0)
                {
                        elfSize += DepositELFSymbol(buf + elfSize, 0, 0, 0, 3, 0, elfHdrNum[ES_BSS]);
                        extraSyms++;
                }

                int numSymbols = AssignSymbolNosELF(buf + elfSize, AddELFSymEntry);
                elfSize += numSymbols * 0x10;

                // String table
                int strtabLoc = elfSize;
                memcpy(buf + elfSize, strtable, strindx);
                elfSize += strindx;
                // Pad for next section (LONG boundary)
                elfSize = (elfSize + 3) & ~3;

                headerSize += DepositELFSectionHeader(headers + headerSize, shstTab[ES_SYMTAB], 2, 0, 0, symtabLoc, (numSymbols + extraSyms) * 0x10, shstIndex + 2, firstglobal + extraSyms, 4, 0x10);
                headerSize += DepositELFSectionHeader(headers + headerSize, shstTab[ES_STRTAB], 3, 0, 0, strtabLoc, strindx, 0, 0, 1, 0);

                // Add relocation tables, if any (no need to align after these, they're
                // already on DWORD boundaries)
                if (sect[TEXT].relocs > 0)
                {
                        uint32_t textrelSize = CreateELFRelocationRecord(buf + elfSize, buf + textLoc, TEXT);
                        // Deposit offset & size, now that we know them
                        chptr = headers + textrelLoc + 0x10;
                        D_long(elfSize);
                        D_long(textrelSize);
                        elfSize += textrelSize;
                }

                if (sect[DATA].relocs > 0)
                {
                        uint32_t datarelSize = CreateELFRelocationRecord(buf + elfSize, buf + dataLoc, DATA);
                        // Deposit offset & size, now that we know them
                        chptr = headers + datarelLoc + 0x10;
                        D_long(elfSize);
                        D_long(datarelSize);
                        elfSize += datarelSize;
                }

                // Copy headers into the object
                memcpy(buf + headerLoc, headers, headerSize);

                // Finally, write out the object
                unused = write(fd, buf, elfSize);

                // Free allocated memory
                if (buf)
                {
                        free(buf);
                        free(strtable);
                }
        }
        else if (obj_format == XEX)
        {
                // Just write the object file
                m6502obj(fd);
        }
        else if (obj_format == C64PRG)
        {
                // Just write the object file
                m6502c64(fd);
        }
        else if (obj_format == P56 || obj_format == LOD)
        {
                // Allocate 6MB object file image memory
                uint8_t * buf = malloc(0x600000);

                if (buf == NULL)
                        return error("cannot allocate object file memory (in P56/LOD mode)");

                memset(buf, 0, 0x600000);               // Clear allocated memory

                // Iterate through DSP ram buffers
                chptr = buf;                                    // -> base of header
                ch_size = 0;
                challoc = 0x600000;

                if (obj_format == LOD)
                        WriteLOD();
                else
                        WriteP56();

                // Write all the things \o/
                unused = write(fd, buf, chptr - buf);

                if (buf)
                        free(buf);
        }
        else if (obj_format == RAW)
        {
                if (!org68k_active && used_architectures & (!(M6502 | M56001P | M56001X | M56001Y | M56001L)))
                        return error("cannot output absolute binary without a starting address (.org or command line)");

                if (used_architectures & M6502)
                {
                        // Okay, this is not the best. But it'll have to do until we revamp things a bit with sections.
                        // Basically we assume that if raw output is requested and 6502 mode was switched on, nobody
                        // switched to other architectures. The combination doesn't make much sense anyway for now.
                        m6502raw(fd);
                        return 0;
                }

                // Alloc memory for text + data construction.
                tds = sect[TEXT].sloc + sect[DATA].sloc;
                buf = malloc(tds);
                chptr = buf;

                // Construct text and data segments; fixup relocatable longs;
                // finally write the text + data

                p = buf;
                objImage = buf;                                 // Set global object image pointer

                for(i=TEXT; i<=DATA; i++)
                {
                        for(cp=sect[i].sfcode; cp!=NULL; cp=cp->chnext)
                        {
                                memcpy(p, cp->chptr, cp->ch_size);
                                p += cp->ch_size;
                        }
                }

                if (MarkABSImage(buf, tds, sect[TEXT].sloc, TEXT) != OK)  // Do TEXT relocation table
                {
                        return ERROR;
                }
                if (MarkABSImage(buf, tds, sect[TEXT].sloc, DATA) != OK) // Do DATA relocation table
                {
                        return ERROR;
                }

                // Write out the header + text & data + symbol table (if any)
                unused = write(fd, buf, tds);

        }
        return 0;
}

static void WriteLOD(void)
{
        D_printf("_START %s 0000 0000 0000 RMAC %01i.%01i.%01i\n\n", firstfname, MAJOR, MINOR, PATCH);

        for(DSP_ORG * l=&dsp_orgmap[0]; l<dsp_currentorg; l++)
        {
                if (l->end != l->start)
                {
                        switch (l->memtype)
                        {
                        case ORG_P: D_printf("_DATA P %.4X\n", l->orgadr); break;
                        case ORG_X: D_printf("_DATA X %.4X\n", l->orgadr); break;
                        case ORG_Y: D_printf("_DATA Y %.4X\n", l->orgadr); break;
                        case ORG_L: D_printf("_DATA L %.4X\n", l->orgadr); break;
                        default:
                                error("Internal error: unknown DSP56001 org'd section");
                                return;
                        }

                        CHUNK * cp = l->chunk;
                        uint8_t * p_chunk = l->start;
                        uint8_t * p_chunk_end = p_chunk;
                        uint32_t j = 0;

                        while (p_chunk_end != l->end)
                        {
                                if (l->end < (cp->chptr + cp->ch_size) && l->end > cp->chptr)
                                {
                                        // If the end of the section is inside the current chunk, just dump everything and stop
                                        p_chunk_end = l->end;
                                }
                                else
                                {
                                        // If the end of the section is not inside the current chunk, just dump everything from the current chunk and move on to the next
                                        p_chunk_end = cp->chptr + cp->ch_size;
                                }

                                uint32_t count = (uint32_t)(p_chunk_end - p_chunk);

                                for(uint32_t i=0; i<count; i+=3)
                                {
                                        if ((j & 7) != 7)
                                        {
                                                D_printf("%.6X ", (((p_chunk[0] << 8) | p_chunk[1]) << 8) | p_chunk[2]);
                                        }
                                        else
                                        {
                                                D_printf("%.6X\n", (((p_chunk[0] << 8) | p_chunk[1]) << 8) | p_chunk[2]);
                                        }

                                        p_chunk += 3;
                                        j++;
                                }

                                cp = cp->chnext;        // Advance chunk

                                if (cp != NULL)
                                        p_chunk = cp->chptr;    // Set dump pointer to start of this chunk
                        }

                        if ((j & 7) != 0)
                                D_printf("\n");
                }
        }

        // Dump the symbol table into the buf
        DumpLODSymbols();

        D_printf("\n_END %.4X\n", dsp_orgmap[0].orgadr);
}

static void WriteP56(void)
{
        for(DSP_ORG * l=&dsp_orgmap[0]; l<dsp_currentorg; l++)
        {
                if (l->end == l->start)
                        continue;

                if ((l->memtype < ORG_P) || (l->memtype > ORG_L))
                {
                        error("Internal error: unknown DSP56001 org'd section");
                        return;
                }

                CHUNK * cp = l->chunk;
                uint8_t * p_chunk = l->start;
                uint8_t * p_chunk_end = p_chunk;

                // Memory type (P, X, Y or L)
                D_dsp(l->memtype);

                // Chunk start address (in DSP words)
                D_dsp(l->orgadr);

                // Chunk length (in DSP words)
                // We'll fill this field after we write the chunk so we can calculate
                // how long it is (so if the chunk is split into different CHUNKs we
                // can deal with this during copy)
                uint8_t * p_buf_len = chptr;
                chptr += 3;

                // The chunk itself
                uint32_t chunk_size = 0;

                while (p_chunk_end != l->end)
                {
                        if (l->end < (cp->chptr + cp->ch_size) && l->end > cp->chptr)
                        {
                                // If the end of the section is inside the current chunk, just
                                // dump everything and stop
                                p_chunk_end = l->end;
                        }
                        else
                        {
                                // If the end of the section is not inside the current chunk,
                                // just dump everything from the current chunk and move on to
                                // the next
                                p_chunk_end = cp->chptr + cp->ch_size;
                        }

                        uint32_t current_chunk_size = p_chunk_end - p_chunk;
                        chunk_size += current_chunk_size;
                        memcpy(chptr, p_chunk, current_chunk_size);
                        chptr += current_chunk_size;

                        cp = cp->chnext;        // Advance chunk

                        if (cp != NULL)
                                p_chunk = cp->chptr;    // Set dump pointer to start of this chunk
                }

                // Now we can mark the chunk's length (DSP word size is 24-bits, so
                // the byte count needs to be divided by 3)
                SETBE24(p_buf_len, chunk_size / 3);
        }
}