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nasm/outaout.c
H. Peter Anvin 1cd0e2d5bf NASM 0.98.08
2002-04-30 21:00:33 +00:00

933 lines
25 KiB
C
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/* outaout.c output routines for the Netwide Assembler to produce
* Linux a.out object files
*
* The Netwide Assembler is copyright (C) 1996 Simon Tatham and
* Julian Hall. All rights reserved. The software is
* redistributable under the licence given in the file "Licence"
* distributed in the NASM archive.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "nasm.h"
#include "nasmlib.h"
#include "outform.h"
#if defined OF_AOUT || defined OF_AOUTB
#define RELTYPE_ABSOLUTE 0x00
#define RELTYPE_RELATIVE 0x01
#define RELTYPE_GOTPC 0x01 /* no explicit GOTPC in a.out */
#define RELTYPE_GOTOFF 0x10
#define RELTYPE_GOT 0x10 /* distinct from GOTOFF bcos sym not sect */
#define RELTYPE_PLT 0x21
#define RELTYPE_SYMFLAG 0x08
struct Reloc {
struct Reloc *next;
long address; /* relative to _start_ of section */
long symbol; /* symbol number or -ve section id */
int bytes; /* 2 or 4 */
int reltype; /* see above */
};
struct Symbol {
long strpos; /* string table position of name */
int type; /* symbol type - see flags below */
long value; /* address, or COMMON variable size */
long size; /* size for data or function exports */
long segment; /* back-reference used by gsym_reloc */
struct Symbol *next; /* list of globals in each section */
struct Symbol *nextfwd; /* list of unresolved-size symbols */
char *name; /* for unresolved-size symbols */
long symnum; /* index into symbol table */
};
/*
* Section IDs - used in Reloc.symbol when negative, and in
* Symbol.type when positive.
*/
#define SECT_ABS 2 /* absolute value */
#define SECT_TEXT 4 /* text section */
#define SECT_DATA 6 /* data section */
#define SECT_BSS 8 /* bss section */
#define SECT_MASK 0xE /* mask out any of the above */
/*
* More flags used in Symbol.type.
*/
#define SYM_GLOBAL 1 /* it's a global symbol */
#define SYM_DATA 0x100 /* used for shared libs */
#define SYM_FUNCTION 0x200 /* used for shared libs */
#define SYM_WITH_SIZE 0x4000 /* not output; internal only */
/*
* Bit more explanation of symbol types: SECT_xxx denotes a local
* symbol. SECT_xxx|SYM_GLOBAL denotes a global symbol, defined in
* this module. Just SYM_GLOBAL, with zero value, denotes an
* external symbol referenced in this module. And just SYM_GLOBAL,
* but with a non-zero value, declares a C `common' variable, of
* size `value'.
*/
struct Section {
struct SAA *data;
unsigned long len, size, nrelocs;
long index;
struct Reloc *head, **tail;
struct Symbol *gsyms, *asym;
};
static struct Section stext, sdata, sbss;
static struct SAA *syms;
static unsigned long nsyms;
static struct RAA *bsym;
static struct SAA *strs;
static unsigned long strslen;
static struct Symbol *fwds;
static FILE *aoutfp;
static efunc error;
static evalfunc evaluate;
static int bsd;
static int is_pic;
static void aout_write(void);
static void aout_write_relocs(struct Reloc *);
static void aout_write_syms(void);
static void aout_sect_write(struct Section *, unsigned char *, unsigned long);
static void aout_pad_sections(void);
static void aout_fixup_relocs(struct Section *);
/*
* Special section numbers which are used to define special
* symbols, which can be used with WRT to provide PIC relocation
* types.
*/
static long aout_gotpc_sect, aout_gotoff_sect;
static long aout_got_sect, aout_plt_sect;
static long aout_sym_sect;
static void aoutg_init(FILE *fp, efunc errfunc, ldfunc ldef, evalfunc eval)
{
aoutfp = fp;
error = errfunc;
evaluate = eval;
(void) ldef; /* placate optimisers */
stext.data = saa_init(1L); stext.head = NULL; stext.tail = &stext.head;
sdata.data = saa_init(1L); sdata.head = NULL; sdata.tail = &sdata.head;
stext.len = stext.size = sdata.len = sdata.size = sbss.len = 0;
stext.nrelocs = sdata.nrelocs = 0;
stext.gsyms = sdata.gsyms = sbss.gsyms = NULL;
stext.index = seg_alloc();
sdata.index = seg_alloc();
sbss.index = seg_alloc();
stext.asym = sdata.asym = sbss.asym = NULL;
syms = saa_init((long)sizeof(struct Symbol));
nsyms = 0;
bsym = raa_init();
strs = saa_init(1L);
strslen = 0;
fwds = NULL;
}
#ifdef OF_AOUT
static void aout_init(FILE *fp, efunc errfunc, ldfunc ldef, evalfunc eval)
{
bsd = FALSE;
aoutg_init (fp, errfunc, ldef, eval);
aout_gotpc_sect = aout_gotoff_sect = aout_got_sect =
aout_plt_sect = aout_sym_sect = NO_SEG;
}
#endif
#ifdef OF_AOUTB
extern struct ofmt of_aoutb;
static void aoutb_init(FILE *fp, efunc errfunc, ldfunc ldef, evalfunc eval)
{
bsd = TRUE;
aoutg_init (fp, errfunc, ldef, eval);
is_pic = 0x00; /* may become 0x40 */
aout_gotpc_sect = seg_alloc();
ldef("..gotpc", aout_gotpc_sect+1, 0L, NULL, FALSE,FALSE,&of_aoutb,error);
aout_gotoff_sect = seg_alloc();
ldef("..gotoff", aout_gotoff_sect+1, 0L,NULL,FALSE,FALSE,&of_aoutb,error);
aout_got_sect = seg_alloc();
ldef("..got", aout_got_sect+1, 0L, NULL, FALSE,FALSE,&of_aoutb,error);
aout_plt_sect = seg_alloc();
ldef("..plt", aout_plt_sect+1, 0L, NULL, FALSE,FALSE,&of_aoutb,error);
aout_sym_sect = seg_alloc();
ldef("..sym", aout_sym_sect+1, 0L, NULL, FALSE,FALSE,&of_aoutb,error);
}
#endif
static void aout_cleanup(int debuginfo)
{
struct Reloc *r;
(void) debuginfo;
aout_pad_sections();
aout_fixup_relocs(&stext);
aout_fixup_relocs(&sdata);
aout_write();
fclose (aoutfp);
saa_free (stext.data);
while (stext.head) {
r = stext.head;
stext.head = stext.head->next;
nasm_free (r);
}
saa_free (sdata.data);
while (sdata.head) {
r = sdata.head;
sdata.head = sdata.head->next;
nasm_free (r);
}
saa_free (syms);
raa_free (bsym);
saa_free (strs);
}
static long aout_section_names (char *name, int pass, int *bits)
{
/*
* Default to 32 bits.
*/
if (!name)
*bits = 32;
if (!name)
return stext.index;
if (!strcmp(name, ".text"))
return stext.index;
else if (!strcmp(name, ".data"))
return sdata.index;
else if (!strcmp(name, ".bss"))
return sbss.index;
else
return NO_SEG;
}
static void aout_deflabel (char *name, long segment, long offset,
int is_global, char *special)
{
int pos = strslen+4;
struct Symbol *sym;
int special_used = FALSE;
if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
/*
* This is a NASM special symbol. We never allow it into
* the a.out symbol table, even if it's a valid one. If it
* _isn't_ a valid one, we should barf immediately.
*/
if (strcmp(name, "..gotpc") && strcmp(name, "..gotoff") &&
strcmp(name, "..got") && strcmp(name, "..plt") &&
strcmp(name, "..sym"))
error (ERR_NONFATAL, "unrecognised special symbol `%s'", name);
return;
}
if (is_global == 3) {
struct Symbol **s;
/*
* Fix up a forward-reference symbol size from the first
* pass.
*/
for (s = &fwds; *s; s = &(*s)->nextfwd)
if (!strcmp((*s)->name, name)) {
struct tokenval tokval;
expr *e;
char *p = special;
while (*p && !isspace(*p)) p++;
while (*p && isspace(*p)) p++;
stdscan_reset();
stdscan_bufptr = p;
tokval.t_type = TOKEN_INVALID;
e = evaluate(stdscan, NULL, &tokval, NULL, 1, error, NULL);
if (e) {
if (!is_simple(e))
error (ERR_NONFATAL, "cannot use relocatable"
" expression as symbol size");
else
(*s)->size = reloc_value(e);
}
/*
* Remove it from the list of unresolved sizes.
*/
nasm_free ((*s)->name);
*s = (*s)->nextfwd;
return;
}
return; /* it wasn't an important one */
}
saa_wbytes (strs, name, (long)(1+strlen(name)));
strslen += 1+strlen(name);
sym = saa_wstruct (syms);
sym->strpos = pos;
sym->type = is_global ? SYM_GLOBAL : 0;
sym->segment = segment;
if (segment == NO_SEG)
sym->type |= SECT_ABS;
else if (segment == stext.index) {
sym->type |= SECT_TEXT;
if (is_global) {
sym->next = stext.gsyms;
stext.gsyms = sym;
} else if (!stext.asym)
stext.asym = sym;
} else if (segment == sdata.index) {
sym->type |= SECT_DATA;
if (is_global) {
sym->next = sdata.gsyms;
sdata.gsyms = sym;
} else if (!sdata.asym)
sdata.asym = sym;
} else if (segment == sbss.index) {
sym->type |= SECT_BSS;
if (is_global) {
sym->next = sbss.gsyms;
sbss.gsyms = sym;
} else if (!sbss.asym)
sbss.asym = sym;
} else
sym->type = SYM_GLOBAL;
if (is_global == 2)
sym->value = offset;
else
sym->value = (sym->type == SYM_GLOBAL ? 0 : offset);
if (is_global && sym->type != SYM_GLOBAL) {
/*
* Global symbol exported _from_ this module. We must check
* the special text for type information.
*/
if (special) {
int n = strcspn(special, " ");
if (!nasm_strnicmp(special, "function", n))
sym->type |= SYM_FUNCTION;
else if (!nasm_strnicmp(special, "data", n) ||
!nasm_strnicmp(special, "object", n))
sym->type |= SYM_DATA;
else
error(ERR_NONFATAL, "unrecognised symbol type `%.*s'",
n, special);
if (special[n]) {
struct tokenval tokval;
expr *e;
int fwd = FALSE;
char *saveme=stdscan_bufptr; /* bugfix? fbk 8/10/00 */
if (!bsd) {
error(ERR_NONFATAL, "Linux a.out does not support"
" symbol size information");
} else {
while (special[n] && isspace(special[n]))
n++;
/*
* We have a size expression; attempt to
* evaluate it.
*/
sym->type |= SYM_WITH_SIZE;
stdscan_reset();
stdscan_bufptr = special+n;
tokval.t_type = TOKEN_INVALID;
e = evaluate(stdscan, NULL, &tokval, &fwd, 0, error, NULL);
if (fwd) {
sym->nextfwd = fwds;
fwds = sym;
sym->name = nasm_strdup(name);
} else if (e) {
if (!is_simple(e))
error (ERR_NONFATAL, "cannot use relocatable"
" expression as symbol size");
else
sym->size = reloc_value(e);
}
}
stdscan_bufptr=saveme; /* bugfix? fbk 8/10/00 */
}
special_used = TRUE;
}
}
/*
* define the references from external-symbol segment numbers
* to these symbol records.
*/
if (segment != NO_SEG && segment != stext.index &&
segment != sdata.index && segment != sbss.index)
bsym = raa_write (bsym, segment, nsyms);
sym->symnum = nsyms;
nsyms++;
if (sym->type & SYM_WITH_SIZE)
nsyms++; /* and another for the size */
if (special && !special_used)
error(ERR_NONFATAL, "no special symbol features supported here");
}
static void aout_add_reloc (struct Section *sect, long segment,
int reltype, int bytes)
{
struct Reloc *r;
r = *sect->tail = nasm_malloc(sizeof(struct Reloc));
sect->tail = &r->next;
r->next = NULL;
r->address = sect->len;
r->symbol = (segment == NO_SEG ? -SECT_ABS :
segment == stext.index ? -SECT_TEXT :
segment == sdata.index ? -SECT_DATA :
segment == sbss.index ? -SECT_BSS :
raa_read(bsym, segment));
r->reltype = reltype;
if (r->symbol >= 0)
r->reltype |= RELTYPE_SYMFLAG;
r->bytes = bytes;
sect->nrelocs++;
}
/*
* This routine deals with ..got and ..sym relocations: the more
* complicated kinds. In shared-library writing, some relocations
* with respect to global symbols must refer to the precise symbol
* rather than referring to an offset from the base of the section
* _containing_ the symbol. Such relocations call to this routine,
* which searches the symbol list for the symbol in question.
*
* RELTYPE_GOT references require the _exact_ symbol address to be
* used; RELTYPE_ABSOLUTE references can be at an offset from the
* symbol. The boolean argument `exact' tells us this.
*
* Return value is the adjusted value of `addr', having become an
* offset from the symbol rather than the section. Should always be
* zero when returning from an exact call.
*
* Limitation: if you define two symbols at the same place,
* confusion will occur.
*
* Inefficiency: we search, currently, using a linked list which
* isn't even necessarily sorted.
*/
static long aout_add_gsym_reloc (struct Section *sect,
long segment, long offset,
int type, int bytes, int exact)
{
struct Symbol *sym, *sm, *shead;
struct Reloc *r;
/*
* First look up the segment to find whether it's text, data,
* bss or an external symbol.
*/
shead = NULL;
if (segment == stext.index)
shead = stext.gsyms;
else if (segment == sdata.index)
shead = sdata.gsyms;
else if (segment == sbss.index)
shead = sbss.gsyms;
if (!shead) {
if (exact && offset != 0)
error (ERR_NONFATAL, "unable to find a suitable global symbol"
" for this reference");
else
aout_add_reloc (sect, segment, type, bytes);
return offset;
}
if (exact) {
/*
* Find a symbol pointing _exactly_ at this one.
*/
for (sym = shead; sym; sym = sym->next)
if (sym->value == offset)
break;
} else {
/*
* Find the nearest symbol below this one.
*/
sym = NULL;
for (sm = shead; sm; sm = sm->next)
if (sm->value <= offset && (!sym || sm->value > sym->value))
sym = sm;
}
if (!sym && exact) {
error (ERR_NONFATAL, "unable to find a suitable global symbol"
" for this reference");
return 0;
}
r = *sect->tail = nasm_malloc(sizeof(struct Reloc));
sect->tail = &r->next;
r->next = NULL;
r->address = sect->len;
r->symbol = sym->symnum;
r->reltype = type | RELTYPE_SYMFLAG;
r->bytes = bytes;
sect->nrelocs++;
return offset - sym->value;
}
/*
* This routine deals with ..gotoff relocations. These _must_ refer
* to a symbol, due to a perversity of *BSD's PIC implementation,
* and it must be a non-global one as well; so we store `asym', the
* first nonglobal symbol defined in each section, and always work
* from that. Relocation type is always RELTYPE_GOTOFF.
*
* Return value is the adjusted value of `addr', having become an
* offset from the `asym' symbol rather than the section.
*/
static long aout_add_gotoff_reloc (struct Section *sect, long segment,
long offset, int bytes)
{
struct Reloc *r;
struct Symbol *asym;
/*
* First look up the segment to find whether it's text, data,
* bss or an external symbol.
*/
asym = NULL;
if (segment == stext.index)
asym = stext.asym;
else if (segment == sdata.index)
asym = sdata.asym;
else if (segment == sbss.index)
asym = sbss.asym;
if (!asym)
error (ERR_NONFATAL, "`..gotoff' relocations require a non-global"
" symbol in the section");
r = *sect->tail = nasm_malloc(sizeof(struct Reloc));
sect->tail = &r->next;
r->next = NULL;
r->address = sect->len;
r->symbol = asym->symnum;
r->reltype = RELTYPE_GOTOFF;
r->bytes = bytes;
sect->nrelocs++;
return offset - asym->value;
}
static void aout_out (long segto, void *data, unsigned long type,
long segment, long wrt)
{
struct Section *s;
long realbytes = type & OUT_SIZMASK;
long addr;
unsigned char mydata[4], *p;
type &= OUT_TYPMASK;
/*
* handle absolute-assembly (structure definitions)
*/
if (segto == NO_SEG) {
if (type != OUT_RESERVE)
error (ERR_NONFATAL, "attempt to assemble code in [ABSOLUTE]"
" space");
return;
}
if (segto == stext.index)
s = &stext;
else if (segto == sdata.index)
s = &sdata;
else if (segto == sbss.index)
s = NULL;
else {
error(ERR_WARNING, "attempt to assemble code in"
" segment %d: defaulting to `.text'", segto);
s = &stext;
}
if (!s && type != OUT_RESERVE) {
error(ERR_WARNING, "attempt to initialise memory in the"
" BSS section: ignored");
if (type == OUT_REL2ADR)
realbytes = 2;
else if (type == OUT_REL4ADR)
realbytes = 4;
sbss.len += realbytes;
return;
}
if (type == OUT_RESERVE) {
if (s) {
error(ERR_WARNING, "uninitialised space declared in"
" %s section: zeroing",
(segto == stext.index ? "code" : "data"));
aout_sect_write (s, NULL, realbytes);
} else
sbss.len += realbytes;
} else if (type == OUT_RAWDATA) {
if (segment != NO_SEG)
error(ERR_PANIC, "OUT_RAWDATA with other than NO_SEG");
aout_sect_write (s, data, realbytes);
} else if (type == OUT_ADDRESS) {
addr = *(long *)data;
if (segment != NO_SEG) {
if (segment % 2) {
error(ERR_NONFATAL, "a.out format does not support"
" segment base references");
} else {
if (wrt == NO_SEG) {
aout_add_reloc (s, segment, RELTYPE_ABSOLUTE, realbytes);
} else if (!bsd) {
error (ERR_NONFATAL, "Linux a.out format does not support"
" any use of WRT");
wrt = NO_SEG; /* we can at least _try_ to continue */
} else if (wrt == aout_gotpc_sect+1) {
is_pic = 0x40;
aout_add_reloc (s, segment, RELTYPE_GOTPC, realbytes);
} else if (wrt == aout_gotoff_sect+1) {
is_pic = 0x40;
addr = aout_add_gotoff_reloc (s, segment,
addr, realbytes);
} else if (wrt == aout_got_sect+1) {
is_pic = 0x40;
addr = aout_add_gsym_reloc (s, segment, addr, RELTYPE_GOT,
realbytes, TRUE);
} else if (wrt == aout_sym_sect+1) {
addr = aout_add_gsym_reloc (s, segment, addr,
RELTYPE_ABSOLUTE, realbytes,
FALSE);
} else if (wrt == aout_plt_sect+1) {
is_pic = 0x40;
error(ERR_NONFATAL, "a.out format cannot produce non-PC-"
"relative PLT references");
} else {
error (ERR_NONFATAL, "a.out format does not support this"
" use of WRT");
wrt = NO_SEG; /* we can at least _try_ to continue */
}
}
}
p = mydata;
if (realbytes == 2)
WRITESHORT (p, addr);
else
WRITELONG (p, addr);
aout_sect_write (s, mydata, realbytes);
} else if (type == OUT_REL2ADR) {
if (segment == segto)
error(ERR_PANIC, "intra-segment OUT_REL2ADR");
if (segment != NO_SEG && segment % 2) {
error(ERR_NONFATAL, "a.out format does not support"
" segment base references");
} else {
if (wrt == NO_SEG) {
aout_add_reloc (s, segment, RELTYPE_RELATIVE, 2);
} else if (!bsd) {
error (ERR_NONFATAL, "Linux a.out format does not support"
" any use of WRT");
wrt = NO_SEG; /* we can at least _try_ to continue */
} else if (wrt == aout_plt_sect+1) {
is_pic = 0x40;
aout_add_reloc (s, segment, RELTYPE_PLT, 2);
} else if (wrt == aout_gotpc_sect+1 ||
wrt == aout_gotoff_sect+1 ||
wrt == aout_got_sect+1) {
error(ERR_NONFATAL, "a.out format cannot produce PC-"
"relative GOT references");
} else {
error (ERR_NONFATAL, "a.out format does not support this"
" use of WRT");
wrt = NO_SEG; /* we can at least _try_ to continue */
}
}
p = mydata;
WRITESHORT (p, *(long*)data-(realbytes + s->len));
aout_sect_write (s, mydata, 2L);
} else if (type == OUT_REL4ADR) {
if (segment == segto)
error(ERR_PANIC, "intra-segment OUT_REL4ADR");
if (segment != NO_SEG && segment % 2) {
error(ERR_NONFATAL, "a.out format does not support"
" segment base references");
} else {
if (wrt == NO_SEG) {
aout_add_reloc (s, segment, RELTYPE_RELATIVE, 4);
} else if (!bsd) {
error (ERR_NONFATAL, "Linux a.out format does not support"
" any use of WRT");
wrt = NO_SEG; /* we can at least _try_ to continue */
} else if (wrt == aout_plt_sect+1) {
is_pic = 0x40;
aout_add_reloc (s, segment, RELTYPE_PLT, 4);
} else if (wrt == aout_gotpc_sect+1 ||
wrt == aout_gotoff_sect+1 ||
wrt == aout_got_sect+1) {
error(ERR_NONFATAL, "a.out format cannot produce PC-"
"relative GOT references");
} else {
error (ERR_NONFATAL, "a.out format does not support this"
" use of WRT");
wrt = NO_SEG; /* we can at least _try_ to continue */
}
}
p = mydata;
WRITELONG (p, *(long*)data-(realbytes + s->len));
aout_sect_write (s, mydata, 4L);
}
}
static void aout_pad_sections(void)
{
static unsigned char pad[] = { 0x90, 0x90, 0x90, 0x90 };
/*
* Pad each of the text and data sections with NOPs until their
* length is a multiple of four. (NOP == 0x90.) Also increase
* the length of the BSS section similarly.
*/
aout_sect_write (&stext, pad, (-(long)stext.len) & 3);
aout_sect_write (&sdata, pad, (-(long)sdata.len) & 3);
sbss.len = (sbss.len + 3) & ~3;
}
/*
* 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 aout_write(void)
{
/*
* Emit the a.out header.
*/
/* OMAGIC, M_386 or MID_I386, no flags */
fwritelong (bsd ? 0x07018600 | is_pic : 0x640107L, aoutfp);
fwritelong (stext.len, aoutfp);
fwritelong (sdata.len, aoutfp);
fwritelong (sbss.len, aoutfp);
fwritelong (nsyms * 12, aoutfp); /* length of symbol table */
fwritelong (0L, aoutfp); /* object files have no entry point */
fwritelong (stext.nrelocs * 8, aoutfp); /* size of text relocs */
fwritelong (sdata.nrelocs * 8, aoutfp); /* size of data relocs */
/*
* Write out the code section and the data section.
*/
saa_fpwrite (stext.data, aoutfp);
saa_fpwrite (sdata.data, aoutfp);
/*
* Write out the relocations.
*/
aout_write_relocs (stext.head);
aout_write_relocs (sdata.head);
/*
* Write the symbol table.
*/
aout_write_syms ();
/*
* And the string table.
*/
fwritelong (strslen+4, aoutfp); /* length includes length count */
saa_fpwrite (strs, aoutfp);
}
static void aout_write_relocs (struct Reloc *r)
{
while (r) {
unsigned long word2;
fwritelong (r->address, aoutfp);
if (r->symbol >= 0)
word2 = r->symbol;
else
word2 = -r->symbol;
word2 |= r->reltype << 24;
word2 |= (r->bytes == 1 ? 0 :
r->bytes == 2 ? 0x2000000L : 0x4000000L);
fwritelong (word2, aoutfp);
r = r->next;
}
}
static void aout_write_syms (void)
{
int 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' */
}
}
}
static void aout_sect_write (struct Section *sect,
unsigned char *data, unsigned long len)
{
saa_wbytes (sect->data, data, len);
sect->len += len;
}
static long aout_segbase (long segment)
{
return segment;
}
static int aout_directive (char *directive, char *value, int pass)
{
return 0;
}
static void aout_filename (char *inname, char *outname, efunc error)
{
standard_extension (inname, outname, ".o", error);
}
static char *aout_stdmac[] = {
"%define __SECT__ [section .text]",
"%macro __NASM_CDecl__ 1",
"%endmacro",
NULL
};
static int aout_set_info(enum geninfo type, char **val)
{
return 0;
}
#endif /* OF_AOUT || OF_AOUTB */
#ifdef OF_AOUT
struct ofmt of_aout = {
"Linux a.out object files",
"aout",
NULL,
null_debug_arr,
&null_debug_form,
aout_stdmac,
aout_init,
aout_set_info,
aout_out,
aout_deflabel,
aout_section_names,
aout_segbase,
aout_directive,
aout_filename,
aout_cleanup
};
#endif
#ifdef OF_AOUTB
struct ofmt of_aoutb = {
"NetBSD/FreeBSD a.out object files",
"aoutb",
NULL,
null_debug_arr,
&null_debug_form,
aout_stdmac,
aoutb_init,
aout_set_info,
aout_out,
aout_deflabel,
aout_section_names,
aout_segbase,
aout_directive,
aout_filename,
aout_cleanup
};
#endif
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