### 2.13 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 `config/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 `archures.c`.

#### 2.13.1 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, 68020 for Motorola 68020.

    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_fido                  9
    #define bfd_mach_mcf_isa_a_nodiv       10
    #define bfd_mach_mcf_isa_a             11
    #define bfd_mach_mcf_isa_a_mac         12
    #define bfd_mach_mcf_isa_a_emac        13
    #define bfd_mach_mcf_isa_aplus         14
    #define bfd_mach_mcf_isa_aplus_mac     15
    #define bfd_mach_mcf_isa_aplus_emac    16
    #define bfd_mach_mcf_isa_b_nousp       17
    #define bfd_mach_mcf_isa_b_nousp_mac   18
    #define bfd_mach_mcf_isa_b_nousp_emac  19
    #define bfd_mach_mcf_isa_b             20
    #define bfd_mach_mcf_isa_b_mac         21
    #define bfd_mach_mcf_isa_b_emac        22
    #define bfd_mach_mcf_isa_b_float       23
    #define bfd_mach_mcf_isa_b_float_mac   24
    #define bfd_mach_mcf_isa_b_float_emac  25
    #define bfd_mach_mcf_isa_c             26
    #define bfd_mach_mcf_isa_c_mac         27
    #define bfd_mach_mcf_isa_c_emac        28
    #define bfd_mach_mcf_isa_c_nodiv       29
    #define bfd_mach_mcf_isa_c_nodiv_mac   30
    #define bfd_mach_mcf_isa_c_nodiv_emac  31
      bfd_arch_vax,       /* DEC Vax.  */

      bfd_arch_or1k,      /* OpenRISC 1000.  */
    #define bfd_mach_or1k          1
    #define bfd_mach_or1knd        2

      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.  */
    #define bfd_mach_sparc_v8plusc         11 /* with UA2005 and T1 add'ns.  */
    #define bfd_mach_sparc_v9c             12 /* with UA2005 and T1 add'ns.  */
    #define bfd_mach_sparc_v8plusd         13 /* with UA2007 and T3 add'ns.  */
    #define bfd_mach_sparc_v9d             14 /* with UA2007 and T3 add'ns.  */
    #define bfd_mach_sparc_v8pluse         15 /* with OSA2001 and T4 add'ns (no IMA).  */
    #define bfd_mach_sparc_v9e             16 /* with OSA2001 and T4 add'ns (no IMA).  */
    #define bfd_mach_sparc_v8plusv         17 /* with OSA2011 and T4 and IMA and FJMAU add'ns.  */
    #define bfd_mach_sparc_v9v             18 /* with OSA2011 and T4 and IMA and FJMAU add'ns.  */
    #define bfd_mach_sparc_v8plusm         19 /* with OSA2015 and M7 add'ns.  */
    #define bfd_mach_sparc_v9m             20 /* with OSA2015 and M7 add'ns.  */
    #define bfd_mach_sparc_v8plusm8        21 /* with OSA2017 and M8 add'ns.  */
    #define bfd_mach_sparc_v9m8            22 /* with OSA2017 and M8 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_v9m8 \
       && (mach) != bfd_mach_sparc_sparclite_le)
    /* Nonzero if MACH is a 64 bit sparc architecture.  */
    #define bfd_mach_sparc_64bit_p(mach) \
      ((mach) >= bfd_mach_sparc_v9 \
       && (mach) != bfd_mach_sparc_v8plusb \
       && (mach) != bfd_mach_sparc_v8plusc \
       && (mach) != bfd_mach_sparc_v8plusd \
       && (mach) != bfd_mach_sparc_v8pluse \
       && (mach) != bfd_mach_sparc_v8plusv \
       && (mach) != bfd_mach_sparc_v8plusm \
       && (mach) != bfd_mach_sparc_v8plusm8)
      bfd_arch_spu,       /* PowerPC SPU.  */
    #define bfd_mach_spu           256
      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_mips5900              5900
    #define bfd_mach_mips6000              6000
    #define bfd_mach_mips7000              7000
    #define bfd_mach_mips8000              8000
    #define bfd_mach_mips9000              9000
    #define bfd_mach_mips10000             10000
    #define bfd_mach_mips12000             12000
    #define bfd_mach_mips14000             14000
    #define bfd_mach_mips16000             16000
    #define bfd_mach_mips16                16
    #define bfd_mach_mips5                 5
    #define bfd_mach_mips_loongson_2e      3001
    #define bfd_mach_mips_loongson_2f      3002
    #define bfd_mach_mips_gs464            3003
    #define bfd_mach_mips_gs464e           3004
    #define bfd_mach_mips_gs264e           3005
    #define bfd_mach_mips_sb1              12310201 /* octal 'SB', 01.  */
    #define bfd_mach_mips_octeon           6501
    #define bfd_mach_mips_octeonp          6601
    #define bfd_mach_mips_octeon2          6502
    #define bfd_mach_mips_octeon3          6503
    #define bfd_mach_mips_xlr              887682   /* decimal 'XLR'.  */
    #define bfd_mach_mips_interaptiv_mr2   736550   /* decimal 'IA2'.  */
    #define bfd_mach_mipsisa32             32
    #define bfd_mach_mipsisa32r2           33
    #define bfd_mach_mipsisa32r3           34
    #define bfd_mach_mipsisa32r5           36
    #define bfd_mach_mipsisa32r6           37
    #define bfd_mach_mipsisa64             64
    #define bfd_mach_mipsisa64r2           65
    #define bfd_mach_mipsisa64r3           66
    #define bfd_mach_mipsisa64r5           68
    #define bfd_mach_mipsisa64r6           69
    #define bfd_mach_mips_micromips        96
      bfd_arch_i386,      /* Intel 386.  */
    #define bfd_mach_i386_intel_syntax     (1 << 0)
    #define bfd_mach_i386_i8086            (1 << 1)
    #define bfd_mach_i386_i386             (1 << 2)
    #define bfd_mach_x86_64                (1 << 3)
    #define bfd_mach_x64_32                (1 << 4)
    #define bfd_mach_i386_i386_intel_syntax (bfd_mach_i386_i386 | bfd_mach_i386_intel_syntax)
    #define bfd_mach_x86_64_intel_syntax   (bfd_mach_x86_64 | bfd_mach_i386_intel_syntax)
    #define bfd_mach_x64_32_intel_syntax   (bfd_mach_x64_32 | bfd_mach_i386_intel_syntax)
      bfd_arch_l1om,      /* Intel L1OM.  */
    #define bfd_mach_l1om                  (1 << 5)
    #define bfd_mach_l1om_intel_syntax     (bfd_mach_l1om | bfd_mach_i386_intel_syntax)
      bfd_arch_k1om,      /* Intel K1OM.  */
    #define bfd_mach_k1om                  (1 << 6)
    #define bfd_mach_k1om_intel_syntax     (bfd_mach_k1om | bfd_mach_i386_intel_syntax)
    #define bfd_mach_i386_nacl             (1 << 7)
    #define bfd_mach_i386_i386_nacl        (bfd_mach_i386_i386 | bfd_mach_i386_nacl)
    #define bfd_mach_x86_64_nacl           (bfd_mach_x86_64 | bfd_mach_i386_nacl)
    #define bfd_mach_x64_32_nacl           (bfd_mach_x64_32 | bfd_mach_i386_nacl)
      bfd_arch_iamcu,     /* Intel MCU.  */
    #define bfd_mach_iamcu                 (1 << 8)
    #define bfd_mach_i386_iamcu            (bfd_mach_i386_i386 | bfd_mach_iamcu)
    #define bfd_mach_i386_iamcu_intel_syntax (bfd_mach_i386_iamcu | bfd_mach_i386_intel_syntax)
      bfd_arch_romp,      /* IBM ROMP PC/RT.  */
      bfd_arch_convex,    /* Convex.  */
      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_plugin,
      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_405       405
    #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
    #define bfd_mach_ppc_e500mc    5001
    #define bfd_mach_ppc_e500mc64  5005
    #define bfd_mach_ppc_e5500     5006
    #define bfd_mach_ppc_e6500     5007
    #define bfd_mach_ppc_titan     83
    #define bfd_mach_ppc_vle       84
      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_m9s12x,    /* Freescale S12X.  */
      bfd_arch_m9s12xg,   /* Freescale XGATE.  */
      bfd_arch_s12z,    /* Freescale S12Z.  */
    #define bfd_mach_s12z_default 0
      bfd_arch_z8k,       /* Zilog Z8000.  */
    #define bfd_mach_z8001         1
    #define bfd_mach_z8002         2
      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_sh2a                          0x2a
    #define bfd_mach_sh2a_nofpu                    0x2b
    #define bfd_mach_sh2a_nofpu_or_sh4_nommu_nofpu 0x2a1
    #define bfd_mach_sh2a_nofpu_or_sh3_nommu       0x2a2
    #define bfd_mach_sh2a_or_sh4                   0x2a3
    #define bfd_mach_sh2a_or_sh3e                  0x2a4
    #define bfd_mach_sh2e                          0x2e
    #define bfd_mach_sh3                           0x30
    #define bfd_mach_sh3_nommu                     0x31
    #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_sh4_nommu_nofpu               0x42
    #define bfd_mach_sh4a                          0x4a
    #define bfd_mach_sh4a_nofpu                    0x4b
    #define bfd_mach_sh4al_dsp                     0x4d
      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
    #define bfd_mach_arm_iWMMXt2   13
    #define bfd_mach_arm_5TEJ      14
    #define bfd_mach_arm_6         15
    #define bfd_mach_arm_6KZ       16
    #define bfd_mach_arm_6T2       17
    #define bfd_mach_arm_6K        18
    #define bfd_mach_arm_7         19
    #define bfd_mach_arm_6M        20
    #define bfd_mach_arm_6SM       21
    #define bfd_mach_arm_7EM       22
    #define bfd_mach_arm_8         23
    #define bfd_mach_arm_8R        24
    #define bfd_mach_arm_8M_BASE   25
    #define bfd_mach_arm_8M_MAIN   26
    #define bfd_mach_arm_8_1M_MAIN 27
      bfd_arch_nds32,     /* Andes NDS32.  */
    #define bfd_mach_n1            1
    #define bfd_mach_n1h           2
    #define bfd_mach_n1h_v2        3
    #define bfd_mach_n1h_v3        4
    #define bfd_mach_n1h_v3m       5
      bfd_arch_ns32k,     /* National Semiconductors ns32000.  */
      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_tic6x,     /* Texas Instruments TMS320C6X.  */
      bfd_arch_tic80,     /* TI TMS320c80 (MVP).  */
      bfd_arch_v850,      /* NEC V850.  */
      bfd_arch_v850_rh850,/* NEC V850 (using RH850 ABI).  */
    #define bfd_mach_v850          1
    #define bfd_mach_v850e         'E'
    #define bfd_mach_v850e1        '1'
    #define bfd_mach_v850e2        0x4532
    #define bfd_mach_v850e2v3      0x45325633
    #define bfd_mach_v850e3v5      0x45335635 /* ('E'|'3'|'V'|'5').  */
      bfd_arch_arc,       /* ARC Cores.  */
    #define bfd_mach_arc_a4        0
    #define bfd_mach_arc_a5        1
    #define bfd_mach_arc_arc600    2
    #define bfd_mach_arc_arc601    4
    #define bfd_mach_arc_arc700    3
    #define bfd_mach_arc_arcv2     5
     bfd_arch_m32c,       /* Renesas M16C/M32C.  */
    #define bfd_mach_m16c          0x75
    #define bfd_mach_m32c          0x78
      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_fr450         450
    #define bfd_mach_frvtomcat     499     /* fr500 prototype.  */
    #define bfd_mach_fr500         500
    #define bfd_mach_fr550         550
      bfd_arch_moxie,     /* The moxie processor.  */
    #define bfd_mach_moxie         1
      bfd_arch_ft32,      /* The ft32 processor.  */
    #define bfd_mach_ft32          1
    #define bfd_mach_ft32b         2
      bfd_arch_mcore,
      bfd_arch_mep,
    #define bfd_mach_mep           1
    #define bfd_mach_mep_h1        0x6831
    #define bfd_mach_mep_c5        0x6335
      bfd_arch_metag,
    #define bfd_mach_metag         1
      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_bpf,       /* Linux eBPF.  */
    #define bfd_mach_bpf           1
      bfd_arch_epiphany,  /* Adapteva EPIPHANY.  */
    #define bfd_mach_epiphany16    1
    #define bfd_mach_epiphany32    2
      bfd_arch_mt,
    #define bfd_mach_ms1           1
    #define bfd_mach_mrisc2        2
    #define bfd_mach_ms2           3
      bfd_arch_pj,
      bfd_arch_avr,       /* Atmel AVR microcontrollers.  */
    #define bfd_mach_avr1          1
    #define bfd_mach_avr2          2
    #define bfd_mach_avr25         25
    #define bfd_mach_avr3          3
    #define bfd_mach_avr31         31
    #define bfd_mach_avr35         35
    #define bfd_mach_avr4          4
    #define bfd_mach_avr5          5
    #define bfd_mach_avr51         51
    #define bfd_mach_avr6          6
    #define bfd_mach_avrtiny       100
    #define bfd_mach_avrxmega1     101
    #define bfd_mach_avrxmega2     102
    #define bfd_mach_avrxmega3     103
    #define bfd_mach_avrxmega4     104
    #define bfd_mach_avrxmega5     105
    #define bfd_mach_avrxmega6     106
    #define bfd_mach_avrxmega7     107
      bfd_arch_bfin,      /* ADI Blackfin.  */
    #define bfd_mach_bfin          1
      bfd_arch_cr16,      /* National Semiconductor CompactRISC (ie CR16).  */
    #define bfd_mach_cr16          1
      bfd_arch_crx,       /*  National Semiconductor CRX.  */
    #define bfd_mach_crx           1
      bfd_arch_cris,      /* Axis CRIS.  */
    #define bfd_mach_cris_v0_v10   255
    #define bfd_mach_cris_v32      32
    #define bfd_mach_cris_v10_v32  1032
      bfd_arch_riscv,
    #define bfd_mach_riscv32       132
    #define bfd_mach_riscv64       164
      bfd_arch_rl78,
    #define bfd_mach_rl78          0x75
      bfd_arch_rx,        /* Renesas RX.  */
    #define bfd_mach_rx            0x75
    #define bfd_mach_rx_v2         0x76
    #define bfd_mach_rx_v3         0x77
      bfd_arch_s390,      /* IBM s390.  */
    #define bfd_mach_s390_31       31
    #define bfd_mach_s390_64       64
      bfd_arch_score,     /* Sunplus score.  */
    #define bfd_mach_score3        3
    #define bfd_mach_score7        7
      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_msp20         20
    #define bfd_mach_msp21         21
    #define bfd_mach_msp22         22
    #define bfd_mach_msp23         23
    #define bfd_mach_msp24         24
    #define bfd_mach_msp26         26
    #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
    #define bfd_mach_msp430x       45
    #define bfd_mach_msp46         46
    #define bfd_mach_msp47         47
    #define bfd_mach_msp54         54
      bfd_arch_xc16x,     /* Infineon's XC16X Series.  */
    #define bfd_mach_xc16x         1
    #define bfd_mach_xc16xl        2
    #define bfd_mach_xc16xs        3
      bfd_arch_xgate,     /* Freescale XGATE.  */
    #define bfd_mach_xgate         1
      bfd_arch_xtensa,    /* Tensilica's Xtensa cores.  */
    #define bfd_mach_xtensa        1
      bfd_arch_z80,
    #define bfd_mach_z80strict     1 /* No undocumented opcodes.  */
    #define bfd_mach_z80           3 /* With ixl, ixh, iyl, and iyh.  */
    #define bfd_mach_z80full       7 /* All undocumented instructions.  */
    #define bfd_mach_r800          11 /* R800: successor with multiplication.  */
      bfd_arch_lm32,      /* Lattice Mico32.  */
    #define bfd_mach_lm32          1
      bfd_arch_microblaze,/* Xilinx MicroBlaze.  */
      bfd_arch_tilepro,   /* Tilera TILEPro.  */
      bfd_arch_tilegx,    /* Tilera TILE-Gx.  */
    #define bfd_mach_tilepro       1
    #define bfd_mach_tilegx        1
    #define bfd_mach_tilegx32      2
      bfd_arch_aarch64,   /* AArch64.  */
    #define bfd_mach_aarch64 0
    #define bfd_mach_aarch64_ilp32 32
      bfd_arch_nios2,     /* Nios II.  */
    #define bfd_mach_nios2         0
    #define bfd_mach_nios2r1       1
    #define bfd_mach_nios2r2       2
      bfd_arch_visium,    /* Visium.  */
    #define bfd_mach_visium        1
      bfd_arch_wasm32,    /* WebAssembly.  */
    #define bfd_mach_wasm32        1
      bfd_arch_pru,       /* PRU.  */
    #define bfd_mach_pru           0
      bfd_arch_nfp,       /* Netronome Flow Processor */
    #define bfd_mach_nfp3200       0x3200
    #define bfd_mach_nfp6000       0x6000
      bfd_arch_csky,      /* C-SKY.  */
    #define bfd_mach_ck_unknown    0
    #define bfd_mach_ck510         1
    #define bfd_mach_ck610         2
    #define bfd_mach_ck801         3
    #define bfd_mach_ck802         4
    #define bfd_mach_ck803         5
    #define bfd_mach_ck807         6
    #define bfd_mach_ck810         7
      bfd_arch_last
      };

#### 2.13.2 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 *,
                                                  const struct bfd_arch_info *);

      bfd_boolean (*scan) (const struct bfd_arch_info *, const char *);

      /* Allocate via bfd_malloc and return a fill buffer of size COUNT.  If
         IS_BIGENDIAN is TRUE, the order of bytes is big endian.  If CODE is
         TRUE, the buffer contains code.  */
      void *(*fill) (bfd_size_type count, bfd_boolean is_bigendian,
                     bfd_boolean code);

      const struct bfd_arch_info *next;

      /* On some architectures the offset for a relocation can point into
         the middle of an instruction.  This field specifies the maximum
         offset such a relocation can have (in octets).  This affects the
         behaviour of the disassembler, since a value greater than zero
         means that it may need to disassemble an instruction twice, once
         to get its length and then a second time to display it.  If the
         value is negative then this has to be done for every single
         instruction, regardless of the offset of the reloc.  */
      signed int max_reloc_offset_into_insn;
    }
    bfd_arch_info_type;

#### 2.13.2.1 `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.

#### 2.13.2.2 `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 string. Return a pointer to an `arch_info` structure if a machine is found, otherwise NULL.

#### 2.13.2.3 `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.

#### 2.13.2.4 `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.

#### 2.13.2.5 `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;

#### 2.13.2.6 `bfd_set_arch_info`

Synopsis

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

Description
Set the architecture info of abfd to arg.

#### 2.13.2.7 `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 abfd to arch and mach. Find the correct pointer to a structure and insert it into the `arch_info` pointer.

#### 2.13.2.8 `bfd_get_arch`

Synopsis

    enum bfd_architecture bfd_get_arch (const bfd *abfd);

Description
Return the enumerated type which describes the BFD abfd’s architecture.

#### 2.13.2.9 `bfd_get_mach`

Synopsis

    unsigned long bfd_get_mach (const bfd *abfd);

Description
Return the long type which describes the BFD abfd’s machine.

#### 2.13.2.10 `bfd_arch_bits_per_byte`

Synopsis

    unsigned int bfd_arch_bits_per_byte (const bfd *abfd);

Description
Return the number of bits in one of the BFD abfd’s architecture’s bytes.

#### 2.13.2.11 `bfd_arch_bits_per_address`

Synopsis

    unsigned int bfd_arch_bits_per_address (const bfd *abfd);

Description
Return the number of bits in one of the BFD abfd’s architecture’s addresses.

#### 2.13.2.12 `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.

#### 2.13.2.13 `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.

#### 2.13.2.14 `bfd_get_arch_info`

Synopsis

    const bfd_arch_info_type *bfd_get_arch_info (bfd *abfd);

Description
Return the architecture info struct in abfd.

#### 2.13.2.15 `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 arch and machine. A machine of 0 matches the machine/architecture structure which marks itself as the default.

#### 2.13.2.16 `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.

#### 2.13.2.17 `bfd_octets_per_byte`

Synopsis

    unsigned int bfd_octets_per_byte (const bfd *abfd,
        const asection *sec);

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.

#### 2.13.2.18 `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

#### 2.13.2.19 `bfd_arch_default_fill`

Synopsis

    void *bfd_arch_default_fill (bfd_size_type count,
        bfd_boolean is_bigendian,
        bfd_boolean code);

Description
Allocate via bfd_malloc and return a fill buffer of size COUNT. If IS_BIGENDIAN is TRUE, the order of bytes is big endian. If CODE is TRUE, the buffer contains code.