1#!/bin/bash 2# SPDX-License-Identifier: GPL-2.0 3# 4# ----------------------------------------------------------------------------- 5# Extracts the vmlinux built-in firmware blobs - requires a non-stripped image 6# ----------------------------------------------------------------------------- 7 8if [ -z "$1" ]; then 9 echo "Must provide a non-stripped vmlinux as argument" 10 exit 1 11fi 12 13read -r RD_ADDR_HEX RD_OFF_HEX <<< "$( readelf -SW "$1" |\ 14grep -w rodata | awk '{print "0x"$5" 0x"$6}' )" 15 16FW_SYMS="$(readelf -sW "$1" |\ 17awk -n '/fw_end/ { end=$2 ; print name " 0x" start " 0x" end; } { start=$2; name=$8; }')" 18 19while IFS= read -r entry; do 20 read -r FW_NAME FW_ADDR_ST_HEX FW_ADDR_END_HEX <<< "$entry" 21 22 # Notice kernel prepends _fw_ and appends _bin to the FW name 23 # in rodata; hence we hereby filter that out. 24 FW_NAME=${FW_NAME:4:-4} 25 26 FW_OFFSET="$(printf "%d" $((FW_ADDR_ST_HEX - RD_ADDR_HEX + RD_OFF_HEX)))" 27 FW_SIZE="$(printf "%d" $((FW_ADDR_END_HEX - FW_ADDR_ST_HEX)))" 28 29 dd if="$1" of="./${FW_NAME}" bs="${FW_SIZE}" count=1 iflag=skip_bytes skip="${FW_OFFSET}" 30done <<< "${FW_SYMS}" 31