targets.c

早期freebsd实现

.
.  SDEF(void, _bfd_coff_swap_sym_in,(
.       bfd            *abfd ,
.       PTR             ext,
.       PTR             in));
.
.  SDEF(void, _bfd_coff_swap_lineno_in,  (
.       bfd            *abfd,
.       PTR            ext,
.       PTR             in));
.

Special entry points for gas to swap coff parts

. SDEF(unsigned int, _bfd_coff_swap_aux_out,(
.       bfd   	*abfd,
.       PTR	in,
.       int    	type,
.       int    	class,
.       PTR    	ext));
.
. SDEF(unsigned int, _bfd_coff_swap_sym_out,(
.      bfd      *abfd,
.      PTR	in,
.      PTR	ext));
.
. SDEF(unsigned int, _bfd_coff_swap_lineno_out,(
.      	bfd   	*abfd,
.      	PTR	in,
.	PTR	ext));
.
. SDEF(unsigned int, _bfd_coff_swap_reloc_out,(
.      	bfd     *abfd,
.     	PTR	src,
.	PTR	dst));
.
. SDEF(unsigned int, _bfd_coff_swap_filehdr_out,(
.      	bfd  	*abfd,
.	PTR 	in,
.	PTR 	out));
.
. SDEF(unsigned int, _bfd_coff_swap_aouthdr_out,(
.      	bfd 	*abfd,
.	PTR 	in,
.	PTR	out));
.
. SDEF(unsigned int, _bfd_coff_swap_scnhdr_out,(
.      	bfd  	*abfd,
.      	PTR	in,
.	PTR	out));
.
. {* See documentation on reloc types.  *}
. SDEF (CONST struct reloc_howto_struct *,
.       reloc_type_lookup,
.       (bfd *abfd, bfd_reloc_code_real_type code));
.
. {* Complete and utter crock, currently used for the assembler
.    when creating COFF files.  *}
. SDEF (asymbol *, _bfd_make_debug_symbol, (
.       bfd *abfd,
.       void *ptr,
.       unsigned long size));

Data for use by back-end routines; e.g., for a.out, includes whether
this particular target maps ZMAGIC files contiguously or with text and
data separated.  Could perhaps also be used to eliminate some of the
above COFF-specific fields.

. PTR backend_data;
.} bfd_target;

*/

/* The default is to define a target_vector containing all the targets.
   By setting MINIMIZE=1 on the "make" command line, the user can change this
   to a vector containing just DEFAULT_VECTOR and any required
   traditional-core-file handler.  (This is to save space in the executables.)
   The config files can also override the default large vector by giving an
   explicit SELECT_VECS macro.  */

#if MINIMIZE && defined(DEFAULT_VECTOR) && !defined(SELECT_VECS)
#ifdef TRAD_CORE
#define SELECT_VECS &DEFAULT_VECTOR,&trad_core_vec
#else
#define SELECT_VECS &DEFAULT_VECTOR
#endif
#endif

/* All known xvecs.  They are listed a second time below, since
   we can't intermix extern's and initializers.  */
extern bfd_target ecoff_little_vec;
extern bfd_target ecoff_big_vec;
extern bfd_target sunos_big_vec;
extern bfd_target demo_64_vec;
extern bfd_target srec_vec;
extern bfd_target tekhex_vec;
extern bfd_target a_out_adobe_vec;
extern bfd_target b_out_vec_little_host;
extern bfd_target b_out_vec_big_host;
extern bfd_target icoff_little_vec;
extern bfd_target icoff_big_vec;
extern bfd_target elf_little_vec;
extern bfd_target elf_big_vec;
extern bfd_target ieee_vec;
extern bfd_target oasys_vec;
extern bfd_target m88kbcs_vec;
extern bfd_target m68kcoff_vec;
extern bfd_target i386coff_vec;
extern bfd_target i386aout_vec;
extern bfd_target i386linux_vec;
extern bfd_target a29kcoff_big_vec;
extern bfd_target trad_core_vec;
extern bfd_target rs6000coff_vec;
extern bfd_target h8300coff_vec;
extern bfd_target z8kcoff_vec;
extern bfd_target we32kcoff_vec;
#ifdef hp9000s800
extern bfd_target hppa_vec;
#endif

#ifdef DEFAULT_VECTOR
extern bfd_target DEFAULT_VECTOR;
#endif

#ifdef SELECT_VECS

bfd_target *target_vector[] = {
	SELECT_VECS,
	0
};

#else

bfd_target *target_vector[] = {

#ifdef DEFAULT_VECTOR
	&DEFAULT_VECTOR,
#endif

	&i386coff_vec,
	&i386aout_vec,
	&ecoff_little_vec,
	&ecoff_big_vec,
	&ieee_vec,
#if 0
	/* We have no oasys tools anymore, so we can't test any of this
	   anymore. If you want to test the stuff yourself, go ahead...
	   [e-mail]
	   Worse, since there is no magic number for archives, there
	   can annoying target mis-matches.  */
	&oasys_vec,
#endif
#if BSD >= 199103
	&sparcbsd_big_vec,
#endif
	&sunos_big_vec,
#ifdef HOST_64_BIT
	&demo_64_vec,	/* Only compiled if host has long-long support */
#endif
	&h8300coff_vec,
	&z8kcoff_vec,
	&m88kbcs_vec,
	&srec_vec,
/*	&tekhex_vec,*/
	&icoff_little_vec,
	&icoff_big_vec,
	&elf_little_vec,
	&elf_big_vec,
	&a_out_adobe_vec,
	&b_out_vec_little_host,
	&b_out_vec_big_host,
	&m68kcoff_vec,
	&a29kcoff_big_vec,
	&rs6000coff_vec,
#ifdef hp9000s800
        &hppa_vec,
#endif
	&we32kcoff_vec,

#ifdef	TRAD_CORE
	&trad_core_vec,
#endif
	NULL, /* end of list marker */
};

#endif

/* default_vector[0] contains either the address of the default vector,
   if there is one, or zero if there isn't.  */

bfd_target *default_vector[] = {
#ifdef DEFAULT_VECTOR
	&DEFAULT_VECTOR,
#endif
	0,
};




/*
FUNCTION
	bfd_find_target

DESCRIPTION
	Returns a pointer to the transfer vector for the object target
	named target_name.  If target_name is NULL, chooses the one in
	the environment variable GNUTARGET; if that is null or not
	defined thenthe first entry in the target list is chosen.
	Passing in the string "default" or setting the environment
	variable to "default" will cause the first entry in the target
	list to be returned, and "target_defaulted" will be set in the
	BFD.  This causes <<bfd_check_format>> to loop over all the
	targets to find the one that matches the file being read.   

SYNOPSIS
	bfd_target *bfd_find_target(CONST char *, bfd *);
*/

bfd_target *
DEFUN(bfd_find_target,(target_name, abfd),
      CONST char *target_name AND
      bfd *abfd)
{
  bfd_target **target;
  extern char *getenv ();
  CONST char *targname = (target_name ? target_name : 
			  (CONST char *) getenv ("GNUTARGET"));

  /* This is safe; the vector cannot be null */
  if (targname == NULL || !strcmp (targname, "default")) {
    abfd->target_defaulted = true;
    return abfd->xvec = target_vector[0];
  }

  abfd->target_defaulted = false;

  for (target = &target_vector[0]; *target != NULL; target++) {
    if (!strcmp (targname, (*target)->name))
      return abfd->xvec = *target;
  }

  bfd_error = invalid_target;
  return NULL;
}


/*
FUNCTION
	bfd_target_list

DESCRIPTION
	This function returns a freshly malloced NULL-terminated
	vector of the names of all the valid BFD targets. Do not
	modify the names 

SYNOPSIS
	CONST char **bfd_target_list(void);

*/

CONST char **
DEFUN_VOID(bfd_target_list)
{
  int vec_length= 0;
#ifdef NATIVE_HPPAHPUX_COMPILER
  /* The native compiler on the HP9000/700 has a bug which causes it
     to loop endlessly when compiling this file.  This avoids it.  */
  volatile
#endif
    bfd_target **target;
  CONST  char **name_list, **name_ptr;

  for (target = &target_vector[0]; *target != NULL; target++)
    vec_length++;

  name_ptr = 
    name_list = (CONST char **) zalloc ((vec_length + 1) * sizeof (char **));

  if (name_list == NULL) {
    bfd_error = no_memory;
    return NULL;
  }

  for (target = &target_vector[0]; *target != NULL; target++)
    *(name_ptr++) = (*target)->name;

  return name_list;
}