1#!/bin/sh 2# 3# $Id: native-elf-format 3293 2016-01-07 19:26:27Z emaste $ 4# 5# Find the native ELF format for a host platform by compiling a 6# test object and examining the resulting object. 7# 8# This script is used if there is no easy way to determine this 9# information statically at compile time. 10 11program=`basename $0` 12tmp_c=`mktemp -u nefXXXXXX`.c 13tmp_o=`echo ${tmp_c} | sed -e 's/.c$/.o/'` 14 15trap "rm -f ${tmp_c} ${tmp_o}" 0 1 2 3 15 16 17touch ${tmp_c} 18 19echo "/* Generated by ${program} on `date` */" 20 21cc -c ${tmp_c} -o ${tmp_o} 22LC_ALL=C readelf -h ${tmp_o} | awk ' 23$1 ~ "Class:" { 24 sub("ELF","",$2); elfclass = $2; 25 } 26$1 ~ "Data:" { 27 if (match($0, "little")) { 28 elfdata = "LSB"; 29 } else { 30 elfdata = "MSB"; 31 } 32 } 33$1 ~ "Machine:" { 34 if (match($0, "Intel.*386")) { 35 elfarch = "EM_386"; 36 } else if (match($0, "MIPS")) { 37 elfarch = "EM_MIPS"; 38 } else if (match($0, ".*[xX]86-64")) { 39 elfarch = "EM_X86_64"; 40 } else { 41 elfarch = "unknown"; 42 } 43 } 44END { 45 printf("#define ELFTC_CLASS ELFCLASS%s\n", elfclass); 46 printf("#define ELFTC_ARCH %s\n", elfarch); 47 printf("#define ELFTC_BYTEORDER ELFDATA2%s\n", elfdata); 48}' 49 50