| 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 | |
| 8 | if [ -z "$1" ]; then |
| 9 | echo "Must provide a non-stripped vmlinux as argument" |
| 10 | exit 1 |
| 11 | fi |
| 12 | |
| 13 | read -r RD_ADDR_HEX RD_OFF_HEX <<< "$( readelf -SW "$1" |\ |
| 14 | grep -w rodata | awk '{print "0x"$5" 0x"$6}' )" |
| 15 | |
| 16 | FW_SYMS="$(readelf -sW "$1" |\ |
| 17 | awk -n '/fw_end/ { end=$2 ; print name " 0x" start " 0x" end; } { start=$2; name=$8; }')" |
| 18 | |
| 19 | while IFS= read -r entry; do |
| 20 | read -r FW_NAME FW_ADDR_ST_HEX FW_ADDR_END_HEX <<< "$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}" |
| 30 | done <<< "${FW_SYMS}" |