2004-04-02 Andrew Cagney <cagney@redhat.com>

[binutils.git] / bfd / archures.c

/* BFD library support routines for architectures.
   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   2000, 2001, 2002, 2003
   Free Software Foundation, Inc.
   Hacked by John Gilmore and Steve Chamberlain of Cygnus Support.

   This file is part of BFD, the Binary File Descriptor library.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "safe-ctype.h"

/*

SECTION
        Architectures

        BFD keeps one atom in a BFD describing the
        architecture of the data attached to the BFD: a pointer to a
        <<bfd_arch_info_type>>.

        Pointers to structures can be requested independently of a BFD
        so that an architecture's information can be interrogated
        without access to an open BFD.

        The architecture information is provided by each architecture package.
        The set of default architectures is selected by the macro
        <<SELECT_ARCHITECTURES>>.  This is normally set up in the
        @file{config/@var{target}.mt} file of your choice.  If the name is not
        defined, then all the architectures supported are included.

        When BFD starts up, all the architectures are called with an
        initialize method.  It is up to the architecture back end to
        insert as many items into the list of architectures as it wants to;
        generally this would be one for each machine and one for the
        default case (an item with a machine field of 0).

        BFD's idea of an architecture is implemented in @file{archures.c}.
*/

/*

SUBSECTION
        bfd_architecture

DESCRIPTION
        This enum gives the object file's CPU architecture, in a
        global sense---i.e., what processor family does it belong to?
        Another field indicates which processor within
        the family is in use.  The machine gives a number which
        distinguishes different versions of the architecture,
        containing, for example, 2 and 3 for Intel i960 KA and i960 KB,
        and 68020 and 68030 for Motorola 68020 and 68030.

.enum bfd_architecture
.{
.  bfd_arch_unknown,   {* File arch not known.  *}
.  bfd_arch_obscure,   {* Arch known, not one of these.  *}
.  bfd_arch_m68k,      {* Motorola 68xxx *}
.#define bfd_mach_m68000 1
.#define bfd_mach_m68008 2
.#define bfd_mach_m68010 3
.#define bfd_mach_m68020 4
.#define bfd_mach_m68030 5
.#define bfd_mach_m68040 6
.#define bfd_mach_m68060 7
.#define bfd_mach_cpu32  8
.#define bfd_mach_mcf5200  9
.#define bfd_mach_mcf5206e 10
.#define bfd_mach_mcf5307  11
.#define bfd_mach_mcf5407  12
.#define bfd_mach_mcf528x  13
.  bfd_arch_vax,       {* DEC Vax *}
.  bfd_arch_i960,      {* Intel 960 *}
.    {* The order of the following is important.
.       lower number indicates a machine type that
.       only accepts a subset of the instructions
.       available to machines with higher numbers.
.       The exception is the "ca", which is
.       incompatible with all other machines except
.       "core".  *}
.
.#define bfd_mach_i960_core      1
.#define bfd_mach_i960_ka_sa     2
.#define bfd_mach_i960_kb_sb     3
.#define bfd_mach_i960_mc        4
.#define bfd_mach_i960_xa        5
.#define bfd_mach_i960_ca        6
.#define bfd_mach_i960_jx        7
.#define bfd_mach_i960_hx        8
.
.  bfd_arch_or32,      {* OpenRISC 32 *}
.
.  bfd_arch_a29k,      {* AMD 29000 *}
.  bfd_arch_sparc,     {* SPARC *}
.#define bfd_mach_sparc                 1
.{* The difference between v8plus and v9 is that v9 is a true 64 bit env.  *}
.#define bfd_mach_sparc_sparclet        2
.#define bfd_mach_sparc_sparclite       3
.#define bfd_mach_sparc_v8plus          4
.#define bfd_mach_sparc_v8plusa         5 {* with ultrasparc add'ns.  *}
.#define bfd_mach_sparc_sparclite_le    6
.#define bfd_mach_sparc_v9              7
.#define bfd_mach_sparc_v9a             8 {* with ultrasparc add'ns.  *}
.#define bfd_mach_sparc_v8plusb         9 {* with cheetah add'ns.  *}
.#define bfd_mach_sparc_v9b             10 {* with cheetah add'ns.  *}
.{* Nonzero if MACH has the v9 instruction set.  *}
.#define bfd_mach_sparc_v9_p(mach) \
.  ((mach) >= bfd_mach_sparc_v8plus && (mach) <= bfd_mach_sparc_v9b \
.   && (mach) != bfd_mach_sparc_sparclite_le)
.  bfd_arch_mips,      {* MIPS Rxxxx *}
.#define bfd_mach_mips3000              3000
.#define bfd_mach_mips3900              3900
.#define bfd_mach_mips4000              4000
.#define bfd_mach_mips4010              4010
.#define bfd_mach_mips4100              4100
.#define bfd_mach_mips4111              4111
.#define bfd_mach_mips4120              4120
.#define bfd_mach_mips4300              4300
.#define bfd_mach_mips4400              4400
.#define bfd_mach_mips4600              4600
.#define bfd_mach_mips4650              4650
.#define bfd_mach_mips5000              5000
.#define bfd_mach_mips5400              5400
.#define bfd_mach_mips5500              5500
.#define bfd_mach_mips6000              6000
.#define bfd_mach_mips7000              7000
.#define bfd_mach_mips8000              8000
.#define bfd_mach_mips10000             10000
.#define bfd_mach_mips12000             12000
.#define bfd_mach_mips16                16
.#define bfd_mach_mips5                 5
.#define bfd_mach_mips_sb1              12310201 {* octal 'SB', 01 *}
.#define bfd_mach_mipsisa32             32
.#define bfd_mach_mipsisa32r2           33
.#define bfd_mach_mipsisa64             64
.#define bfd_mach_mipsisa64r2           65
.  bfd_arch_i386,      {* Intel 386 *}
.#define bfd_mach_i386_i386 1
.#define bfd_mach_i386_i8086 2
.#define bfd_mach_i386_i386_intel_syntax 3
.#define bfd_mach_x86_64 64
.#define bfd_mach_x86_64_intel_syntax 65
.  bfd_arch_we32k,     {* AT&T WE32xxx *}
.  bfd_arch_tahoe,     {* CCI/Harris Tahoe *}
.  bfd_arch_i860,      {* Intel 860 *}
.  bfd_arch_i370,      {* IBM 360/370 Mainframes *}
.  bfd_arch_romp,      {* IBM ROMP PC/RT *}
.  bfd_arch_alliant,   {* Alliant *}
.  bfd_arch_convex,    {* Convex *}
.  bfd_arch_m88k,      {* Motorola 88xxx *}
.  bfd_arch_m98k,      {* Motorola 98xxx *}
.  bfd_arch_pyramid,   {* Pyramid Technology *}
.  bfd_arch_h8300,     {* Renesas H8/300 (formerly Hitachi H8/300) *}
.#define bfd_mach_h8300    1
.#define bfd_mach_h8300h   2
.#define bfd_mach_h8300s   3
.#define bfd_mach_h8300hn  4
.#define bfd_mach_h8300sn  5
.#define bfd_mach_h8300sx  6
.#define bfd_mach_h8300sxn 7
.  bfd_arch_pdp11,     {* DEC PDP-11 *}
.  bfd_arch_powerpc,   {* PowerPC *}
.#define bfd_mach_ppc           32
.#define bfd_mach_ppc64         64
.#define bfd_mach_ppc_403       403
.#define bfd_mach_ppc_403gc     4030
.#define bfd_mach_ppc_505       505
.#define bfd_mach_ppc_601       601
.#define bfd_mach_ppc_602       602
.#define bfd_mach_ppc_603       603
.#define bfd_mach_ppc_ec603e    6031
.#define bfd_mach_ppc_604       604
.#define bfd_mach_ppc_620       620
.#define bfd_mach_ppc_630       630
.#define bfd_mach_ppc_750       750
.#define bfd_mach_ppc_860       860
.#define bfd_mach_ppc_a35       35
.#define bfd_mach_ppc_rs64ii    642
.#define bfd_mach_ppc_rs64iii   643
.#define bfd_mach_ppc_7400      7400
.#define bfd_mach_ppc_e500      500
.  bfd_arch_rs6000,    {* IBM RS/6000 *}
.#define bfd_mach_rs6k          6000
.#define bfd_mach_rs6k_rs1      6001
.#define bfd_mach_rs6k_rsc      6003
.#define bfd_mach_rs6k_rs2      6002
.  bfd_arch_hppa,      {* HP PA RISC *}
.#define bfd_mach_hppa10        10
.#define bfd_mach_hppa11        11
.#define bfd_mach_hppa20        20
.#define bfd_mach_hppa20w       25
.  bfd_arch_d10v,      {* Mitsubishi D10V *}
.#define bfd_mach_d10v          1
.#define bfd_mach_d10v_ts2      2
.#define bfd_mach_d10v_ts3      3
.  bfd_arch_d30v,      {* Mitsubishi D30V *}
.  bfd_arch_dlx,       {* DLX *}
.  bfd_arch_m68hc11,   {* Motorola 68HC11 *}
.  bfd_arch_m68hc12,   {* Motorola 68HC12 *}
.#define bfd_mach_m6812_default 0
.#define bfd_mach_m6812         1
.#define bfd_mach_m6812s        2
.  bfd_arch_z8k,       {* Zilog Z8000 *}
.#define bfd_mach_z8001         1
.#define bfd_mach_z8002         2
.  bfd_arch_h8500,     {* Renesas H8/500 (formerly Hitachi H8/500) *}
.  bfd_arch_sh,        {* Renesas / SuperH SH (formerly Hitachi SH) *}
.#define bfd_mach_sh            1
.#define bfd_mach_sh2        0x20
.#define bfd_mach_sh_dsp     0x2d
.#define bfd_mach_sh2e       0x2e
.#define bfd_mach_sh3        0x30
.#define bfd_mach_sh3_dsp    0x3d
.#define bfd_mach_sh3e       0x3e
.#define bfd_mach_sh4        0x40
.#define bfd_mach_sh4_nofpu  0x41
.#define bfd_mach_sh4a       0x4a
.#define bfd_mach_sh4a_nofpu 0x4b
.#define bfd_mach_sh4al_dsp  0x4d
.#define bfd_mach_sh5        0x50
.  bfd_arch_alpha,     {* Dec Alpha *}
.#define bfd_mach_alpha_ev4  0x10
.#define bfd_mach_alpha_ev5  0x20
.#define bfd_mach_alpha_ev6  0x30
.  bfd_arch_arm,       {* Advanced Risc Machines ARM.  *}
.#define bfd_mach_arm_unknown   0
.#define bfd_mach_arm_2         1
.#define bfd_mach_arm_2a        2
.#define bfd_mach_arm_3         3
.#define bfd_mach_arm_3M        4
.#define bfd_mach_arm_4         5
.#define bfd_mach_arm_4T        6
.#define bfd_mach_arm_5         7
.#define bfd_mach_arm_5T        8
.#define bfd_mach_arm_5TE       9
.#define bfd_mach_arm_XScale    10
.#define bfd_mach_arm_ep9312    11
.#define bfd_mach_arm_iWMMXt    12
.  bfd_arch_ns32k,     {* National Semiconductors ns32000 *}
.  bfd_arch_w65,       {* WDC 65816 *}
.  bfd_arch_tic30,     {* Texas Instruments TMS320C30 *}
.  bfd_arch_tic4x,     {* Texas Instruments TMS320C3X/4X *}
.#define bfd_mach_tic3x         30
.#define bfd_mach_tic4x         40
.  bfd_arch_tic54x,    {* Texas Instruments TMS320C54X *}
.  bfd_arch_tic80,     {* TI TMS320c80 (MVP) *}
.  bfd_arch_v850,      {* NEC V850 *}
.#define bfd_mach_v850          1
.#define bfd_mach_v850e         'E'
.#define bfd_mach_v850e1        '1'
.  bfd_arch_arc,       {* ARC Cores *}
.#define bfd_mach_arc_5         5
.#define bfd_mach_arc_6         6
.#define bfd_mach_arc_7         7
.#define bfd_mach_arc_8         8
.  bfd_arch_m32r,      {* Renesas M32R (formerly Mitsubishi M32R/D) *}
.#define bfd_mach_m32r          1 {* For backwards compatibility.  *}
.#define bfd_mach_m32rx         'x'
.#define bfd_mach_m32r2         '2'
.  bfd_arch_mn10200,   {* Matsushita MN10200 *}
.  bfd_arch_mn10300,   {* Matsushita MN10300 *}
.#define bfd_mach_mn10300               300
.#define bfd_mach_am33          330
.#define bfd_mach_am33_2        332
.  bfd_arch_fr30,
.#define bfd_mach_fr30          0x46523330
.  bfd_arch_frv,
.#define bfd_mach_frv           1
.#define bfd_mach_frvsimple     2
.#define bfd_mach_fr300         300
.#define bfd_mach_fr400         400
.#define bfd_mach_frvtomcat     499     {* fr500 prototype *}
.#define bfd_mach_fr500         500
.#define bfd_mach_fr550         550
.  bfd_arch_mcore,
.  bfd_arch_ia64,      {* HP/Intel ia64 *}
.#define bfd_mach_ia64_elf64    64
.#define bfd_mach_ia64_elf32    32
.  bfd_arch_ip2k,      {* Ubicom IP2K microcontrollers. *}
.#define bfd_mach_ip2022        1
.#define bfd_mach_ip2022ext     2
. bfd_arch_iq2000,     {* Vitesse IQ2000.  *}
.#define bfd_mach_iq2000        1
.#define bfd_mach_iq10          2
.  bfd_arch_pj,
.  bfd_arch_avr,       {* Atmel AVR microcontrollers.  *}
.#define bfd_mach_avr1          1
.#define bfd_mach_avr2          2
.#define bfd_mach_avr3          3
.#define bfd_mach_avr4          4
.#define bfd_mach_avr5          5
.  bfd_arch_cris,      {* Axis CRIS *}
.  bfd_arch_s390,      {* IBM s390 *}
.#define bfd_mach_s390_31       31
.#define bfd_mach_s390_64       64
.  bfd_arch_openrisc,  {* OpenRISC *}
.  bfd_arch_mmix,      {* Donald Knuth's educational processor.  *}
.  bfd_arch_xstormy16,
.#define bfd_mach_xstormy16     1
.  bfd_arch_msp430,    {* Texas Instruments MSP430 architecture.  *}
.#define bfd_mach_msp11          11
.#define bfd_mach_msp110         110
.#define bfd_mach_msp12          12
.#define bfd_mach_msp13          13
.#define bfd_mach_msp14          14
.#define bfd_mach_msp15          15
.#define bfd_mach_msp16          16  
.#define bfd_mach_msp31          31
.#define bfd_mach_msp32          32
.#define bfd_mach_msp33          33
.#define bfd_mach_msp41          41
.#define bfd_mach_msp42          42
.#define bfd_mach_msp43          43
.#define bfd_mach_msp44          44
.  bfd_arch_xtensa,    {* Tensilica's Xtensa cores.  *}
.#define bfd_mach_xtensa        1
.  bfd_arch_last
.  };
*/

/*
SUBSECTION
        bfd_arch_info

DESCRIPTION
        This structure contains information on architectures for use
        within BFD.

.
.typedef struct bfd_arch_info
.{
.  int bits_per_word;
.  int bits_per_address;
.  int bits_per_byte;
.  enum bfd_architecture arch;
.  unsigned long mach;
.  const char *arch_name;
.  const char *printable_name;
.  unsigned int section_align_power;
.  {* TRUE if this is the default machine for the architecture.
.     The default arch should be the first entry for an arch so that
.     all the entries for that arch can be accessed via <<next>>.  *}
.  bfd_boolean the_default;
.  const struct bfd_arch_info * (*compatible)
.    (const struct bfd_arch_info *a, const struct bfd_arch_info *b);
.
.  bfd_boolean (*scan) (const struct bfd_arch_info *, const char *);
.
.  const struct bfd_arch_info *next;
.}
.bfd_arch_info_type;
.
*/

extern const bfd_arch_info_type bfd_a29k_arch;
extern const bfd_arch_info_type bfd_alpha_arch;
extern const bfd_arch_info_type bfd_arc_arch;
extern const bfd_arch_info_type bfd_arm_arch;
extern const bfd_arch_info_type bfd_avr_arch;
extern const bfd_arch_info_type bfd_cris_arch;
extern const bfd_arch_info_type bfd_d10v_arch;
extern const bfd_arch_info_type bfd_d30v_arch;
extern const bfd_arch_info_type bfd_dlx_arch;
extern const bfd_arch_info_type bfd_fr30_arch;
extern const bfd_arch_info_type bfd_frv_arch;
extern const bfd_arch_info_type bfd_h8300_arch;
extern const bfd_arch_info_type bfd_h8500_arch;
extern const bfd_arch_info_type bfd_hppa_arch;
extern const bfd_arch_info_type bfd_i370_arch;
extern const bfd_arch_info_type bfd_i386_arch;
extern const bfd_arch_info_type bfd_i860_arch;
extern const bfd_arch_info_type bfd_i960_arch;
extern const bfd_arch_info_type bfd_ia64_arch;
extern const bfd_arch_info_type bfd_ip2k_arch;
extern const bfd_arch_info_type bfd_iq2000_arch;
extern const bfd_arch_info_type bfd_m32r_arch;
extern const bfd_arch_info_type bfd_m68hc11_arch;
extern const bfd_arch_info_type bfd_m68hc12_arch;
extern const bfd_arch_info_type bfd_m68k_arch;
extern const bfd_arch_info_type bfd_m88k_arch;
extern const bfd_arch_info_type bfd_mcore_arch;
extern const bfd_arch_info_type bfd_mips_arch;
extern const bfd_arch_info_type bfd_mmix_arch;
extern const bfd_arch_info_type bfd_mn10200_arch;
extern const bfd_arch_info_type bfd_mn10300_arch;
extern const bfd_arch_info_type bfd_msp430_arch;
extern const bfd_arch_info_type bfd_ns32k_arch;
extern const bfd_arch_info_type bfd_openrisc_arch;
extern const bfd_arch_info_type bfd_or32_arch;
extern const bfd_arch_info_type bfd_pdp11_arch;
extern const bfd_arch_info_type bfd_pj_arch;
extern const bfd_arch_info_type bfd_powerpc_archs[];
#define bfd_powerpc_arch bfd_powerpc_archs[0]
extern const bfd_arch_info_type bfd_rs6000_arch;
extern const bfd_arch_info_type bfd_s390_arch;
extern const bfd_arch_info_type bfd_sh_arch;
extern const bfd_arch_info_type bfd_sparc_arch;
extern const bfd_arch_info_type bfd_tic30_arch;
extern const bfd_arch_info_type bfd_tic4x_arch;
extern const bfd_arch_info_type bfd_tic54x_arch;
extern const bfd_arch_info_type bfd_tic80_arch;
extern const bfd_arch_info_type bfd_v850_arch;
extern const bfd_arch_info_type bfd_vax_arch;
extern const bfd_arch_info_type bfd_we32k_arch;
extern const bfd_arch_info_type bfd_w65_arch;
extern const bfd_arch_info_type bfd_xstormy16_arch;
extern const bfd_arch_info_type bfd_xtensa_arch;
extern const bfd_arch_info_type bfd_z8k_arch;

static const bfd_arch_info_type * const bfd_archures_list[] =
  {
#ifdef SELECT_ARCHITECTURES
    SELECT_ARCHITECTURES,
#else
    &bfd_a29k_arch,
    &bfd_alpha_arch,
    &bfd_arc_arch,
    &bfd_arm_arch,
    &bfd_avr_arch,
    &bfd_cris_arch,
    &bfd_d10v_arch,
    &bfd_d30v_arch,
    &bfd_dlx_arch,
    &bfd_fr30_arch,
    &bfd_frv_arch,
    &bfd_h8300_arch,
    &bfd_h8500_arch,
    &bfd_hppa_arch,
    &bfd_i370_arch,
    &bfd_i386_arch,
    &bfd_i860_arch,
    &bfd_i960_arch,
    &bfd_ia64_arch,
    &bfd_ip2k_arch,
    &bfd_iq2000_arch,
    &bfd_m32r_arch,
    &bfd_m68hc11_arch,
    &bfd_m68hc12_arch,
    &bfd_m68k_arch,
    &bfd_m88k_arch,
    &bfd_mcore_arch,
    &bfd_mips_arch,
    &bfd_mmix_arch,
    &bfd_mn10200_arch,
    &bfd_mn10300_arch,
    &bfd_msp430_arch,
    &bfd_ns32k_arch,
    &bfd_openrisc_arch,
    &bfd_or32_arch,
    &bfd_pdp11_arch,
    &bfd_powerpc_arch,
    &bfd_rs6000_arch,
    &bfd_s390_arch,
    &bfd_sh_arch,
    &bfd_sparc_arch,
    &bfd_tic30_arch,
    &bfd_tic4x_arch,
    &bfd_tic54x_arch,
    &bfd_tic80_arch,
    &bfd_v850_arch,
    &bfd_vax_arch,
    &bfd_w65_arch,
    &bfd_we32k_arch,
    &bfd_xstormy16_arch,
    &bfd_xtensa_arch,
    &bfd_z8k_arch,
#endif
  0
};

/*
FUNCTION
        bfd_printable_name

SYNOPSIS
        const char *bfd_printable_name (bfd *abfd);

DESCRIPTION
        Return a printable string representing the architecture and machine
        from the pointer to the architecture info structure.

*/

const char *
bfd_printable_name (bfd *abfd)
{
  return abfd->arch_info->printable_name;
}

/*
FUNCTION
        bfd_scan_arch

SYNOPSIS
        const bfd_arch_info_type *bfd_scan_arch (const char *string);

DESCRIPTION
        Figure out if BFD supports any cpu which could be described with
        the name @var{string}.  Return a pointer to an <<arch_info>>
        structure if a machine is found, otherwise NULL.
*/

const bfd_arch_info_type *
bfd_scan_arch (const char *string)
{
  const bfd_arch_info_type * const *app, *ap;

  /* Look through all the installed architectures.  */
  for (app = bfd_archures_list; *app != NULL; app++)
    {
      for (ap = *app; ap != NULL; ap = ap->next)
        {
          if (ap->scan (ap, string))
            return ap;
        }
    }

  return NULL;
}

/*
FUNCTION
        bfd_arch_list

SYNOPSIS
        const char **bfd_arch_list (void);

DESCRIPTION
        Return a freshly malloced NULL-terminated vector of the names
        of all the valid BFD architectures.  Do not modify the names.
*/

const char **
bfd_arch_list (void)
{
  int vec_length = 0;
  const char **name_ptr;
  const char **name_list;
  const bfd_arch_info_type * const *app;
  bfd_size_type amt;

  /* Determine the number of architectures.  */
  vec_length = 0;
  for (app = bfd_archures_list; *app != NULL; app++)
    {
      const bfd_arch_info_type *ap;
      for (ap = *app; ap != NULL; ap = ap->next)
        {
          vec_length++;
        }
    }

  amt = (vec_length + 1) * sizeof (char **);
  name_list = bfd_malloc (amt);
  if (name_list == NULL)
    return NULL;

  /* Point the list at each of the names.  */
  name_ptr = name_list;
  for (app = bfd_archures_list; *app != NULL; app++)
    {
      const bfd_arch_info_type *ap;
      for (ap = *app; ap != NULL; ap = ap->next)
        {
          *name_ptr = ap->printable_name;
          name_ptr++;
        }
    }
  *name_ptr = NULL;

  return name_list;
}

/*
FUNCTION
        bfd_arch_get_compatible

SYNOPSIS
        const bfd_arch_info_type *bfd_arch_get_compatible
          (const bfd *abfd, const bfd *bbfd, bfd_boolean accept_unknowns);

DESCRIPTION
        Determine whether two BFDs' architectures and machine types
        are compatible.  Calculates the lowest common denominator
        between the two architectures and machine types implied by
        the BFDs and returns a pointer to an <<arch_info>> structure
        describing the compatible machine.
*/

const bfd_arch_info_type *
bfd_arch_get_compatible (const bfd *abfd,
                         const bfd *bbfd,
                         bfd_boolean accept_unknowns)
{
  const bfd * ubfd = NULL;

  /* Look for an unknown architecture.  */
  if (((ubfd = abfd) && ubfd->arch_info->arch == bfd_arch_unknown)
      || ((ubfd = bbfd) && ubfd->arch_info->arch == bfd_arch_unknown))
    {
      /* We can allow an unknown architecture if accept_unknowns
         is true, or if the target is the "binary" format, which
         has an unknown architecture.  Since the binary format can
         only be set by explicit request from the user, it is safe
         to assume that they know what they are doing.  */
      if (accept_unknowns
          || strcmp (bfd_get_target (ubfd), "binary") == 0)
        return ubfd->arch_info;
      return NULL;
    }

  /* Otherwise architecture-specific code has to decide.  */
  return abfd->arch_info->compatible (abfd->arch_info, bbfd->arch_info);
}

/*
INTERNAL_DEFINITION
        bfd_default_arch_struct

DESCRIPTION
        The <<bfd_default_arch_struct>> is an item of
        <<bfd_arch_info_type>> which has been initialized to a fairly
        generic state.  A BFD starts life by pointing to this
        structure, until the correct back end has determined the real
        architecture of the file.

.extern const bfd_arch_info_type bfd_default_arch_struct;
*/

const bfd_arch_info_type bfd_default_arch_struct = {
  32, 32, 8, bfd_arch_unknown, 0, "unknown", "unknown", 2, TRUE,
  bfd_default_compatible,
  bfd_default_scan,
  0,
};

/*
FUNCTION
        bfd_set_arch_info

SYNOPSIS
        void bfd_set_arch_info (bfd *abfd, const bfd_arch_info_type *arg);

DESCRIPTION
        Set the architecture info of @var{abfd} to @var{arg}.
*/

void
bfd_set_arch_info (bfd *abfd, const bfd_arch_info_type *arg)
{
  abfd->arch_info = arg;
}

/*
INTERNAL_FUNCTION
        bfd_default_set_arch_mach

SYNOPSIS
        bfd_boolean bfd_default_set_arch_mach
          (bfd *abfd, enum bfd_architecture arch, unsigned long mach);

DESCRIPTION
        Set the architecture and machine type in BFD @var{abfd}
        to @var{arch} and @var{mach}.  Find the correct
        pointer to a structure and insert it into the <<arch_info>>
        pointer.
*/

bfd_boolean
bfd_default_set_arch_mach (bfd *abfd,
                           enum bfd_architecture arch,
                           unsigned long mach)
{
  abfd->arch_info = bfd_lookup_arch (arch, mach);
  if (abfd->arch_info != NULL)
    return TRUE;

  abfd->arch_info = &bfd_default_arch_struct;
  bfd_set_error (bfd_error_bad_value);
  return FALSE;
}

/*
FUNCTION
        bfd_get_arch

SYNOPSIS
        enum bfd_architecture bfd_get_arch (bfd *abfd);

DESCRIPTION
        Return the enumerated type which describes the BFD @var{abfd}'s
        architecture.
*/

enum bfd_architecture
bfd_get_arch (bfd *abfd)
{
  return abfd->arch_info->arch;
}

/*
FUNCTION
        bfd_get_mach

SYNOPSIS
        unsigned long bfd_get_mach (bfd *abfd);

DESCRIPTION
        Return the long type which describes the BFD @var{abfd}'s
        machine.
*/

unsigned long
bfd_get_mach (bfd *abfd)
{
  return abfd->arch_info->mach;
}

/*
FUNCTION
        bfd_arch_bits_per_byte

SYNOPSIS
        unsigned int bfd_arch_bits_per_byte (bfd *abfd);

DESCRIPTION
        Return the number of bits in one of the BFD @var{abfd}'s
        architecture's bytes.
*/

unsigned int
bfd_arch_bits_per_byte (bfd *abfd)
{
  return abfd->arch_info->bits_per_byte;
}

/*
FUNCTION
        bfd_arch_bits_per_address

SYNOPSIS
        unsigned int bfd_arch_bits_per_address (bfd *abfd);

DESCRIPTION
        Return the number of bits in one of the BFD @var{abfd}'s
        architecture's addresses.
*/

unsigned int
bfd_arch_bits_per_address (bfd *abfd)
{
  return abfd->arch_info->bits_per_address;
}

/*
INTERNAL_FUNCTION
        bfd_default_compatible

SYNOPSIS
        const bfd_arch_info_type *bfd_default_compatible
          (const bfd_arch_info_type *a, const bfd_arch_info_type *b);

DESCRIPTION
        The default function for testing for compatibility.
*/

const bfd_arch_info_type *
bfd_default_compatible (const bfd_arch_info_type *a,
                        const bfd_arch_info_type *b)
{
  if (a->arch != b->arch)
    return NULL;

  if (a->bits_per_word != b->bits_per_word)
    return NULL;

  if (a->mach > b->mach)
    return a;

  if (b->mach > a->mach)
    return b;

  return a;
}

/*
INTERNAL_FUNCTION
        bfd_default_scan

SYNOPSIS
        bfd_boolean bfd_default_scan
          (const struct bfd_arch_info *info, const char *string);

DESCRIPTION
        The default function for working out whether this is an
        architecture hit and a machine hit.
*/

bfd_boolean
bfd_default_scan (const bfd_arch_info_type *info, const char *string)
{
  const char *ptr_src;
  const char *ptr_tst;
  unsigned long number;
  enum bfd_architecture arch;
  const char *printable_name_colon;

  /* Exact match of the architecture name (ARCH_NAME) and also the
     default architecture?  */
  if (strcasecmp (string, info->arch_name) == 0
      && info->the_default)
    return TRUE;

  /* Exact match of the machine name (PRINTABLE_NAME)?  */
  if (strcasecmp (string, info->printable_name) == 0)
    return TRUE;

  /* Given that printable_name contains no colon, attempt to match:
     ARCH_NAME [ ":" ] PRINTABLE_NAME?  */
  printable_name_colon = strchr (info->printable_name, ':');
  if (printable_name_colon == NULL)
    {
      size_t strlen_arch_name = strlen (info->arch_name);
      if (strncasecmp (string, info->arch_name, strlen_arch_name) == 0)
        {
          if (string[strlen_arch_name] == ':')
            {
              if (strcasecmp (string + strlen_arch_name + 1,
                              info->printable_name) == 0)
                return TRUE;
            }
          else
            {
              if (strcasecmp (string + strlen_arch_name,
                              info->printable_name) == 0)
                return TRUE;
            }
        }
    }

  /* Given that PRINTABLE_NAME has the form: <arch> ":" <mach>;
     Attempt to match: <arch> <mach>?  */
  if (printable_name_colon != NULL)
    {
      size_t colon_index = printable_name_colon - info->printable_name;
      if (strncasecmp (string, info->printable_name, colon_index) == 0
          && strcasecmp (string + colon_index,
                         info->printable_name + colon_index + 1) == 0)
        return TRUE;
    }

  /* Given that PRINTABLE_NAME has the form: <arch> ":" <mach>; Do not
     attempt to match just <mach>, it could be ambiguous.  This test
     is left until later.  */

  /* NOTE: The below is retained for compatibility only.  Please do
     not add to this code.  */

  /* See how much of the supplied string matches with the
     architecture, eg the string m68k:68020 would match the 68k entry
     up to the :, then we get left with the machine number.  */

  for (ptr_src = string, ptr_tst = info->arch_name;
       *ptr_src && *ptr_tst;
       ptr_src++, ptr_tst++)
    {
      if (*ptr_src != *ptr_tst)
        break;
    }

  /* Chewed up as much of the architecture as will match, skip any
     colons.  */
  if (*ptr_src == ':')
    ptr_src++;

  if (*ptr_src == 0)
    {
      /* Nothing more, then only keep this one if it is the default
         machine for this architecture.  */
      return info->the_default;
    }

  number = 0;
  while (ISDIGIT (*ptr_src))
    {
      number = number * 10 + *ptr_src - '0';
      ptr_src++;
    }

  /* NOTE: The below is retained for compatibility only.
     PLEASE DO NOT ADD TO THIS CODE.  */

  switch (number)
    {
      /* FIXME: These are needed to parse IEEE objects.  */
      /* The following seven case's are here only for compatibility with
         older binutils (at least IEEE objects from binutils 2.9.1 require
         them).  */
    case bfd_mach_m68000:
    case bfd_mach_m68010:
    case bfd_mach_m68020:
    case bfd_mach_m68030:
    case bfd_mach_m68040:
    case bfd_mach_m68060:
    case bfd_mach_cpu32:
      arch = bfd_arch_m68k;
      break;
    case 68000:
      arch = bfd_arch_m68k;
      number = bfd_mach_m68000;
      break;
    case 68010:
      arch = bfd_arch_m68k;
      number = bfd_mach_m68010;
      break;
    case 68020:
      arch = bfd_arch_m68k;
      number = bfd_mach_m68020;
      break;
    case 68030:
      arch = bfd_arch_m68k;
      number = bfd_mach_m68030;
      break;
    case 68040:
      arch = bfd_arch_m68k;
      number = bfd_mach_m68040;
      break;
    case 68060:
      arch = bfd_arch_m68k;
      number = bfd_mach_m68060;
      break;
    case 68332:
      arch = bfd_arch_m68k;
      number = bfd_mach_cpu32;
      break;
    case 5200:
      arch = bfd_arch_m68k;
      number = bfd_mach_mcf5200;
      break;
    case 5206:
      arch = bfd_arch_m68k;
      number = bfd_mach_mcf5206e;
      break;
    case 5307:
      arch = bfd_arch_m68k;
      number = bfd_mach_mcf5307;
      break;
    case 5407:
      arch = bfd_arch_m68k;
      number = bfd_mach_mcf5407;
      break;
    case 5282:
      arch = bfd_arch_m68k;
      number = bfd_mach_mcf528x;
      break;

    case 32000:
      arch = bfd_arch_we32k;
      break;

    case 3000:
      arch = bfd_arch_mips;
      number = bfd_mach_mips3000;
      break;

    case 4000:
      arch = bfd_arch_mips;
      number = bfd_mach_mips4000;
      break;

    case 6000:
      arch = bfd_arch_rs6000;
      break;

    case 7410:
      arch = bfd_arch_sh;
      number = bfd_mach_sh_dsp;
      break;

    case 7708:
      arch = bfd_arch_sh;
      number = bfd_mach_sh3;
      break;

    case 7729:
      arch = bfd_arch_sh;
      number = bfd_mach_sh3_dsp;
      break;

    case 7750:
      arch = bfd_arch_sh;
      number = bfd_mach_sh4;
      break;

    default:
      return FALSE;
    }

  if (arch != info->arch)
    return FALSE;

  if (number != info->mach)
    return FALSE;

  return TRUE;
}

/*
FUNCTION
        bfd_get_arch_info

SYNOPSIS
        const bfd_arch_info_type *bfd_get_arch_info (bfd *abfd);

DESCRIPTION
        Return the architecture info struct in @var{abfd}.
*/

const bfd_arch_info_type *
bfd_get_arch_info (bfd *abfd)
{
  return abfd->arch_info;
}

/*
FUNCTION
        bfd_lookup_arch

SYNOPSIS
        const bfd_arch_info_type *bfd_lookup_arch
          (enum bfd_architecture arch, unsigned long machine);

DESCRIPTION
        Look for the architecture info structure which matches the
        arguments @var{arch} and @var{machine}. A machine of 0 matches the
        machine/architecture structure which marks itself as the
        default.
*/

const bfd_arch_info_type *
bfd_lookup_arch (enum bfd_architecture arch, unsigned long machine)
{
  const bfd_arch_info_type * const *app, *ap;

  for (app = bfd_archures_list; *app != NULL; app++)
    {
      for (ap = *app; ap != NULL; ap = ap->next)
        {
          if (ap->arch == arch
              && (ap->mach == machine
                  || (machine == 0 && ap->the_default)))
            return ap;
        }
    }

  return NULL;
}

/*
FUNCTION
        bfd_printable_arch_mach

SYNOPSIS
        const char *bfd_printable_arch_mach
          (enum bfd_architecture arch, unsigned long machine);

DESCRIPTION
        Return a printable string representing the architecture and
        machine type.

        This routine is depreciated.
*/

const char *
bfd_printable_arch_mach (enum bfd_architecture arch, unsigned long machine)
{
  const bfd_arch_info_type *ap = bfd_lookup_arch (arch, machine);

  if (ap)
    return ap->printable_name;
  return "UNKNOWN!";
}

/*
FUNCTION
        bfd_octets_per_byte

SYNOPSIS
        unsigned int bfd_octets_per_byte (bfd *abfd);

DESCRIPTION
        Return the number of octets (8-bit quantities) per target byte
        (minimum addressable unit).  In most cases, this will be one, but some
        DSP targets have 16, 32, or even 48 bits per byte.
*/

unsigned int
bfd_octets_per_byte (bfd *abfd)
{
  return bfd_arch_mach_octets_per_byte (bfd_get_arch (abfd),
                                        bfd_get_mach (abfd));
}

/*
FUNCTION
        bfd_arch_mach_octets_per_byte

SYNOPSIS
        unsigned int bfd_arch_mach_octets_per_byte
          (enum bfd_architecture arch, unsigned long machine);

DESCRIPTION
        See bfd_octets_per_byte.

        This routine is provided for those cases where a bfd * is not
        available
*/

unsigned int
bfd_arch_mach_octets_per_byte (enum bfd_architecture arch,
                               unsigned long mach)
{
  const bfd_arch_info_type *ap = bfd_lookup_arch (arch, mach);

  if (ap)
    return ap->bits_per_byte / 8;
  return 1;
}