static void aout_write_syms (void)
{
unsigned long i;
saa_rewind (syms);
for (i = 0; i < nsyms; i++) {
struct Symbol *sym = saa_rstruct(syms);
fwritelong (sym->strpos, aoutfp);
fwritelong ((long)sym->type & ~SYM_WITH_SIZE, aoutfp);
/*
* Fix up the symbol value now we know the final section
* sizes.
*/
if ((sym->type & SECT_MASK) == SECT_DATA)
sym->value += stext.len;
if ((sym->type & SECT_MASK) == SECT_BSS)
sym->value += stext.len + sdata.len;
fwritelong (sym->value, aoutfp);
/*
* Output a size record if necessary.
*/
if (sym->type & SYM_WITH_SIZE) {
fwritelong(sym->strpos, aoutfp);
fwritelong(0x0DL, aoutfp); /* special value: means size */
fwritelong(sym->size, aoutfp);
i++; /* use up another of `nsyms' */
}
}
}
/*
* a.out files have the curious property that all references to
* things in the data or bss sections are done by addresses which
* are actually relative to the start of the _text_ section, in the
* _file_. (No relation to what happens after linking. No idea why
* this should be so. It's very strange.) So we have to go through
* the relocation table, _after_ the final size of each section is
* known, and fix up the relocations pointed to.
*/
static void aout_fixup_relocs(struct Section *sect)
{
struct Reloc *r;
saa_rewind (sect->data);
for (r = sect->head; r; r = r->next) {
unsigned char *p, *q, blk[4];
long l;
saa_fread (sect->data, r->address, blk, (long)r->bytes);
p = q = blk;
l = *p++;
if (r->bytes > 1) {
l += ((long)*p++) << 8;
if (r->bytes == 4) {
l += ((long)*p++) << 16;
l += ((long)*p++) << 24;
}
}
if (r->symbol == -SECT_DATA)
l += stext.len;
else if (r->symbol == -SECT_BSS)
l += stext.len + sdata.len;
if (r->bytes == 4)
WRITELONG(q, l);
else if (r->bytes == 2)
WRITESHORT(q, l);
else
*q++ = l & 0xFF;
saa_fwrite (sect->data, r->address, blk, (long)r->bytes);
}
}
static void coff_write_symbols (void)
{
char filename[18];
int i;
/*
* The `.file' record, and the file name auxiliary record.
*/
coff_symbol (".file", 0L, 0L, -2, 0x67, 1);
memset (filename, 0, 18);
strncpy (filename, coff_infile, 18);
fwrite (filename, 18, 1, coffp);
/*
* The section records, with their auxiliaries.
*/
memset (filename, 0, 18); /* useful zeroed buffer */
for (i=0; i<nsects; i++) {
coff_symbol (sects[i]->name, 0L, 0L, i+1, 3, 1);
fwritelong (sects[i]->len, coffp);
fwriteshort (sects[i]->nrelocs, coffp);
fwrite (filename, 12, 1, coffp);
}
/*
* The absolute symbol, for relative-to-absolute relocations.
*/
coff_symbol (".absolut", 0L, 0L, -1, 3, 0);
/*
* The real symbols.
*/
saa_rewind (syms);
for (i=0; i<nsyms; i++) {
struct Symbol *sym = saa_rstruct (syms);
coff_symbol (sym->strpos == -1 ? sym->name : NULL,
sym->strpos, sym->value, sym->section,
sym->is_global ? 2 : 3, 0);
}
}
static struct SAA *elf_build_symtab(long *len, long *local)
{
struct SAA *s = saa_init(1L);
struct Symbol *sym;
unsigned char entry[16], *p;
int i;
*len = *local = 0;
/*
* First, an all-zeros entry, required by the ELF spec.
*/
saa_wbytes(s, NULL, 16L); /* null symbol table entry */
*len += 16;
(*local)++;
/*
* Next, an entry for the file name.
*/
p = entry;
WRITELONG(p, 1); /* we know it's 1st thing in strtab */
WRITELONG(p, 0); /* no value */
WRITELONG(p, 0); /* no size either */
WRITESHORT(p, 4); /* type FILE */
WRITESHORT(p, SHN_ABS);
saa_wbytes(s, entry, 16L);
*len += 16;
(*local)++;
/*
* Now some standard symbols defining the segments, for relocation
* purposes.
*/
for (i = 1; i <= nsects + 1; i++) {
p = entry;
WRITELONG(p, 0); /* no symbol name */
WRITELONG(p, 0); /* offset zero */
WRITELONG(p, 0); /* size zero */
WRITESHORT(p, 3); /* local section-type thing */
WRITESHORT(p, (i == 1 ? SHN_ABS : i - 1)); /* the section id */
saa_wbytes(s, entry, 16L);
*len += 16;
(*local)++;
}
/*
* Now the other local symbols.
*/
saa_rewind(syms);
while ((sym = saa_rstruct(syms))) {
if (sym->type & SYM_GLOBAL)
continue;
p = entry;
WRITELONG(p, sym->strpos);
WRITELONG(p, sym->value);
WRITELONG(p, sym->size);
WRITESHORT(p, sym->type); /* local non-typed thing */
WRITESHORT(p, sym->section);
saa_wbytes(s, entry, 16L);
*len += 16;
(*local)++;
}
/*
* Now the global symbols.
*/
saa_rewind(syms);
while ((sym = saa_rstruct(syms))) {
if (!(sym->type & SYM_GLOBAL))
continue;
p = entry;
WRITELONG(p, sym->strpos);
WRITELONG(p, sym->value);
WRITELONG(p, sym->size);
WRITESHORT(p, sym->type); /* global non-typed thing */
WRITESHORT(p, sym->section);
saa_wbytes(s, entry, 16L);
*len += 16;
}
return s;
}
static void as86_write_section(struct Section *sect, int index)
{
struct Piece *p;
uint32_t s;
int32_t length;
fputc(0x20 + index, ofile); /* select the right section */
saa_rewind(sect->data);
for (p = sect->head; p; p = p->next)
switch (p->type) {
case 0:
/*
* Absolute data. Emit it in chunks of at most 64
* bytes.
*/
length = p->bytes;
do {
char buf[64];
int32_t tmplen = (length > 64 ? 64 : length);
fputc(0x40 | (tmplen & 0x3F), ofile);
saa_rnbytes(sect->data, buf, tmplen);
nasm_write(buf, tmplen, ofile);
length -= tmplen;
} while (length > 0);
break;
case 1:
/*
* A segment-type relocation. First fix up the BSS.
*/
if (p->number == SECT_BSS)
p->number = SECT_DATA, p->offset += sdata.len;
as86_set_rsize(p->bytes);
fputc(0x80 | (p->relative ? 0x20 : 0) | p->number, ofile);
if (as86_reloc_size == 2)
fwriteint16_t(p->offset, ofile);
else
fwriteint32_t(p->offset, ofile);
break;
case 2:
/*
* A symbol-type relocation.
*/
as86_set_rsize(p->bytes);
s = p->offset;
if (s > 65535L)
s = 3;
else if (s > 255)
s = 2;
else if (s > 0)
s = 1;
else
s = 0;
fputc(0xC0 |
(p->relative ? 0x20 : 0) |
(p->number > 255 ? 0x04 : 0) | s, ofile);
if (p->number > 255)
fwriteint16_t(p->number, ofile);
else
fputc(p->number, ofile);
switch (s) {
case 0:
break;
case 1:
fputc(p->offset, ofile);
break;
case 2:
fwriteint16_t(p->offset, ofile);
break;
case 3:
fwriteint32_t(p->offset, ofile);
break;
}
break;
}
}
static void as86_write(void)
{
uint32_t i;
int32_t symlen, seglen, segsize;
/*
* First, go through the symbol records working out how big
* each will be. Also fix up BSS references at this time, and
* set the flags words up completely.
*/
symlen = 0;
saa_rewind(syms);
for (i = 0; i < nsyms; i++) {
struct Symbol *sym = saa_rstruct(syms);
if (sym->segment == SECT_BSS)
sym->segment = SECT_DATA, sym->value += sdata.len;
sym->flags |= sym->segment;
if (sym->value == 0)
sym->flags |= 0 << 14, symlen += 4;
else if (sym->value >= 0 && sym->value <= 255)
sym->flags |= 1 << 14, symlen += 5;
else if (sym->value >= 0 && sym->value <= 65535L)
sym->flags |= 2 << 14, symlen += 6;
else
sym->flags |= 3 << 14, symlen += 8;
}
/*
* Now do the same for the segments, and get the segment size
* descriptor word at the same time.
*/
seglen = segsize = 0;
if ((uint32_t)stext.len > 65535L)
segsize |= 0x03000000L, seglen += 4;
else
segsize |= 0x02000000L, seglen += 2;
if ((uint32_t)sdata.len > 65535L)
segsize |= 0xC0000000L, seglen += 4;
else
segsize |= 0x80000000L, seglen += 2;
/*
* Emit the as86 header.
*/
fwriteint32_t(0x000186A3L, ofile);
fputc(0x2A, ofile);
fwriteint32_t(27 + symlen + seglen + strslen, ofile); /* header length */
fwriteint32_t(stext.len + sdata.len + bsslen, ofile);
fwriteint16_t(strslen, ofile);
fwriteint16_t(0, ofile); /* class = revision = 0 */
fwriteint32_t(0x55555555L, ofile); /* segment max sizes: always this */
fwriteint32_t(segsize, ofile); /* segment size descriptors */
if (segsize & 0x01000000L)
fwriteint32_t(stext.len, ofile);
else
fwriteint16_t(stext.len, ofile);
if (segsize & 0x40000000L)
fwriteint32_t(sdata.len + bsslen, ofile);
else
fwriteint16_t(sdata.len + bsslen, ofile);
fwriteint16_t(nsyms, ofile);
/*
* Write the symbol table.
*/
saa_rewind(syms);
for (i = 0; i < nsyms; i++) {
struct Symbol *sym = saa_rstruct(syms);
fwriteint16_t(sym->strpos, ofile);
fwriteint16_t(sym->flags, ofile);
switch (sym->flags & (3 << 14)) {
case 0 << 14:
break;
case 1 << 14:
fputc(sym->value, ofile);
break;
case 2 << 14:
fwriteint16_t(sym->value, ofile);
break;
case 3 << 14:
fwriteint32_t(sym->value, ofile);
break;
}
}
/*
* Write out the string table.
*/
saa_fpwrite(strs, ofile);
/*
* Write the program text.
*/
as86_reloc_size = -1;
as86_write_section(&stext, SECT_TEXT);
as86_write_section(&sdata, SECT_DATA);
/*
* Append the BSS section to the .data section
*/
if (bsslen > 65535L) {
fputc(0x13, ofile);
fwriteint32_t(bsslen, ofile);
} else if (bsslen > 255) {
fputc(0x12, ofile);
fwriteint16_t(bsslen, ofile);
} else if (bsslen) {
fputc(0x11, ofile);
fputc(bsslen, ofile);
}
fputc(0, ofile); /* termination */
}
