.\" Copyright (c) 2010-2011 Joseph Koshy.  All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed.  in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id: elftc_bfd_find_target.3 3348 2016-01-18 14:18:50Z emaste $
.\"
.Dd November 30, 2011
.Os
.Dt ELFTC_BFD_FIND_TARGET
.Sh NAME
.Nm elftc_bfd_find_target ,
.Nm elftc_bfd_target_byteorder ,
.Nm elftc_bfd_target_class ,
.Nm elftc_bfd_target_flavor ,
.Nm elftc_bfd_target_machine
.Nd binary object descriptor handling
.Sh LIBRARY
.Lb libelftc
.Sh SYNOPSIS
.In libelftc.h
.Vt struct Elftc_Bfd_Target;
.Ft "Elftc_Bfd_Target *"
.Fn elftc_bfd_find_target "const char *target_name"
.Ft "unsigned int"
.Fn elftc_bfd_target_class "Elftc_Bfd_Target *target"
.Ft "unsigned int"
.Fn elftc_bfd_target_byteorder "Elftc_Bfd_Target *target"
.Ft Elftc_Bfd_Target_Flavor
.Fn elftc_bfd_target_flavor "Elftc_Bfd_Target *target"
.Ft "unsigned int"
.Fn elftc_bfd_target_machine "Elftc_Bfd_Target *target"
.Sh DESCRIPTION
Function
.Fn elftc_bfd_find_target
locates a binary object descriptor corresponding to the descriptor
name in argument
.Ar "target_name" .
Binary object descriptors encapsulate properties of an object format
such as its file representation, ELF class, and byte endianness.
.Pp
Known descriptor names and their properties include:
.Bl -column -offset "XXXX" ".Li elf32-x86-64-freebsd" "Object format" "Byte Order" "Bit Width"
.It Em Name Ta Em "Object Format" Ta Em "Byte Order" Ta Em "Bit Width"
.It Li binary Ta Binary Ta - Ta -
.It Li efi-app-ia32 Ta PE Ta LSB Ta 32
.It Li efi-app-x86_64 Ta PE Ta LSB Ta 64
.It Li elf32-avr Ta ELF Ta LSB Ta 32
.It Li elf32-big Ta ELF Ta MSB Ta 32
.It Li elf32-bigarm Ta ELF Ta MSB Ta 32
.It Li elf32-bigmips Ta ELF Ta MSB Ta 32
.It Li elf32-i386 Ta ELF Ta LSB Ta 32
.It Li elf32-i386-freebsd Ta ELF Ta LSB Ta 32
.It Li elf32-ia64-big Ta ELF Ta MSB Ta 32
.It Li elf32-little Ta ELF Ta LSB Ta 32
.It Li elf32-littlearm Ta ELF Ta LSB Ta 32
.It Li elf32-littlemips Ta ELF Ta LSB Ta 32
.It Li elf32-powerpc Ta ELF Ta MSB Ta 32
.It Li elf32-powerpcle Ta ELF Ta LSB Ta 32
.It Li elf32-sh Ta ELF Ta MSB Ta 32
.It Li elf32-shl Ta ELF Ta LSB Ta 32
.It Li elf32-sh-nbsd Ta ELF Ta MSB Ta 32
.It Li elf32-shl-nbsd Ta ELF Ta LSB Ta 32
.It Li elf32-shbig-linux Ta ELF Ta MSB Ta 32
.It Li elf32-shl-linux Ta ELF Ta LSB Ta 32
.It Li elf32-sparc Ta ELF Ta MSB Ta 32
.It Li elf64-alpha Ta ELF Ta LSB Ta 64
.It Li elf64-alpha-freebsd Ta ELF Ta LSB Ta 64
.It Li elf64-big Ta ELF Ta MSB Ta 64
.It Li elf64-bigmips Ta ELF Ta MSB Ta 64
.It Li elf64-ia64-big Ta ELF Ta MSB Ta 64
.It Li elf64-ia64-little Ta ELF Ta LSB Ta 64
.It Li elf64-little Ta ELF Ta LSB Ta 64
.It Li elf64-littlemips Ta ELF Ta LSB Ta 64
.It Li elf64-powerpc Ta ELF Ta MSB Ta 64
.It Li elf64-powerpcle Ta ELF Ta LSB Ta 64
.It Li elf64-sh64 Ta ELF Ta MSB Ta 64
.It Li elf64-sh64l Ta ELF Ta LSB Ta 64
.It Li elf64-sh64-nbsd Ta ELF Ta MSB Ta 64
.It Li elf64-sh64l-nbsd Ta ELF Ta LSB Ta 64
.It Li elf64-sh64big-linux Ta ELF Ta MSB Ta 64
.It Li elf64-sh64-linux Ta ELF Ta LSB Ta 64
.It Li elf64-sparc Ta ELF Ta MSB Ta 64
.It Li elf64-sparc-freebsd Ta ELF Ta MSB Ta 64
.It Li elf64-x86-64 Ta ELF Ta LSB Ta 64
.It Li elf64-x86-64-freebsd Ta ELF Ta LSB Ta 64
.It Li ihex Ta IHEX Ta - Ta -
.It Li pei-i386 Ta PE Ta LSB Ta 32
.It Li pei-x86-64 Ta PE Ta LSB Ta 64
.It Li srec Ta SREC Ta - Ta -
.It Li symbolsrec Ta SREC Ta - Ta -
.El
.Pp
Function
.Fn elftc_bfd_target_byteorder
returns the ELF byte order associated with target descriptor
.Ar target .
.Pp
Function
.Fn elftc_bfd_target_class
returns the ELF class associated with target descriptor
.Ar target .
.Pp
Function
.Fn elftc_bfd_target_flavor
returns the object format associated with target descriptor
.Ar target .
The known object formats are:
.Bl -tag -offset "XXXX" -width ".Dv ETF_BINARY" -compact
.It Dv ETF_ELF
An ELF object.
.It Dv ETF_BINARY
Raw binary.
.It Dv ETF_IHEX
An object encoded in
.Tn Intel
hex format.
.It Dv ETF_NONE
An unknown object format.
.It Dv ETF_SREC
An object encoded as S-records.
.El
.Sh RETURN VALUES
Function
.Fn elftc_bfd_find_target
returns a valid pointer to an opaque binary target descriptor if
successful, or NULL in case of an error.
.Pp
Function
.Fn elftc_bfd_target_byteorder
returns the ELF byte order associated with the target descriptor; one of
.Dv ELFDATA2MSB
or
.Dv ELFDATA2LSB .
.Pp
Function
.Fn elftc_bfd_target_class
returns the ELF class associated with the target descriptor; one of
.Dv ELFCLASS32
or
.Dv ELFCLASS64 .
.Pp
Function
.Fn elftc_bfd_target_machine
returns the ELF architecture associated with the target descriptor.
.Pp
Function
.Fn elftc_bfd_target_flavor
returns one of
.Dv ETF_BINARY ,
.Dv ETF_ELF ,
.Dv ETF_IHEX
or
.Dv ETF_SREC
if successful or
.Dv ETF_NONE
in case of error.
.Sh EXAMPLES
To return descriptor information associated with target name
.Dq elf64-big
use:
.Bd -literal -offset indent
struct Elftc_Bfd_Target *t;

if ((t = elftc_bfd_find_target("elf64-big")) == NULL)
	errx(EXIT_FAILURE, "Cannot find target descriptor");

printf("Class: %s\\n", elftc_bfd_target_class(t) == ELFCLASS32 ?
    "ELFCLASS32" : "ELFCLASS64");
printf("Byteorder: %s\\n",
    elftc_bfd_target_byteorder(t) == ELFDATA2LSB ? "LSB" : "MSB");
printf("Flavor: %d\\n", elftc_bfd_target_flavor(t));
.Ed
.Sh SEE ALSO
.Xr elf 3