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100 lines
3.7 KiB
Bash
Executable File
100 lines
3.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Based on code and ideas from @jumkey
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[ -z "${WORK_PATH}" ] || [ ! -d "${WORK_PATH}/include" ] && WORK_PATH="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"
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calculate_run_size() {
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NUM='\([0-9a-fA-F]*[ \t]*\)'
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OUT=$(sed -n 's/^[ \t0-9]*.b[sr][sk][ \t]*'"${NUM}${NUM}${NUM}${NUM}"'.*/0x\1 0x\4/p')
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if [ -z "${OUT}" ]; then
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echo "Never found .bss or .brk file offset" >&2
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return 1
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fi
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read -r sizeA offsetA sizeB offsetB <<<$(echo ${OUT} | awk '{printf "%d %d %d %d", strtonum($1), strtonum($2), strtonum($3), strtonum($4)}')
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runSize=$((offsetA + sizeA + sizeB))
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# BFD linker shows the same file offset in ELF.
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if [ "${offsetA}" -ne "${offsetB}" ]; then
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# Gold linker shows them as consecutive.
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endSize=$((offsetB + sizeB))
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if [ "${endSize}" -ne "${runSize}" ]; then
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printf "sizeA: 0x%x\n" ${sizeA} >&2
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printf "offsetA: 0x%x\n" ${offsetA} >&2
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printf "sizeB: 0x%x\n" ${sizeB} >&2
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printf "offsetB: 0x%x\n" ${offsetB} >&2
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echo ".bss and .brk are non-contiguous" >&2
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return 1
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fi
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fi
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printf "%d\n" ${runSize}
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return 0
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}
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# Adapted from: scripts/Makefile.lib
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# Usage: size_append FILE [FILE2] [FILEn]...
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# Output: LE HEX with size of file in bytes (to STDOUT)
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file_size_le() {
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printf $(
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local dec_size=0
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for F in "$@"; do dec_size=$((dec_size + $(stat -c "%s" "${F}"))); done
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printf "%08x\n" "${dec_size}" | sed 's/\(..\)/\1 /g' | {
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read -r ch0 ch1 ch2 ch3
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for ch in "${ch3}" "${ch2}" "${ch1}" "${ch0}"; do printf '%s%03o' '\' "$((0x${ch}))"; done
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}
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)
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}
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size_le() {
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printf $(
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printf "%08x\n" "${@}" | sed 's/\(..\)/\1 /g' | {
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read -r ch0 ch1 ch2 ch3
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for ch in "${ch3}" "${ch2}" "${ch1}" "${ch0}"; do printf '%s%03o' '\' "$((0x${ch}))"; done
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}
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)
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}
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VMLINUX_MOD=${1}
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ZIMAGE_MOD=${2}
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KVER=$(strings "${VMLINUX_MOD}" | grep -Eo "Linux version [0-9]+\.[0-9]+\.[0-9]+" | head -1 | awk '{print $3}')
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if [ "$(echo "${KVER:-4}" | cut -d'.' -f1)" -lt 5 ]; then
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# Kernel version 4.x or 3.x (bromolow)
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# zImage_head 16494
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# payload(
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# vmlinux.bin x
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# padding 0xf00000-x
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# vmlinux.bin size 4
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# ) 0xf00004
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# zImage_tail(
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# unknown 72
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# run_size 4
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# unknown 30
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# vmlinux.bin size 4
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# unknown 114460
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# ) 114570
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# crc32 4
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gzip -dc "${WORK_PATH}/bzImage-template-v4.gz" >"${ZIMAGE_MOD}" || exit 1
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dd if="${VMLINUX_MOD}" of="${ZIMAGE_MOD}" bs=16494 seek=1 conv=notrunc || exit 1
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file_size_le "${VMLINUX_MOD}" | dd of="${ZIMAGE_MOD}" bs=15745134 seek=1 conv=notrunc || exit 1
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file_size_le "${VMLINUX_MOD}" | dd of="${ZIMAGE_MOD}" bs=15745244 seek=1 conv=notrunc || exit 1
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RUN_SIZE=$(objdump -h "${VMLINUX_MOD}" | calc_run_size)
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size_le "${RUN_SIZE}" | dd of="${ZIMAGE_MOD}" bs=15745210 seek=1 conv=notrunc || exit 1
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size_le "$((16#$(crc32 "${ZIMAGE_MOD}" | awk '{print $1}') ^ 0xFFFFFFFF))" | dd of="${ZIMAGE_MOD}" conv=notrunc oflag=append || exit 1
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else
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# Kernel version 5.x
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gzip -dc "${WORK_PATH}/bzImage-template-v5.gz" >"${ZIMAGE_MOD}" || exit 1
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dd if="${VMLINUX_MOD}" of="${ZIMAGE_MOD}" bs=14561 seek=1 conv=notrunc || exit 1
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file_size_le "${VMLINUX_MOD}" | dd of="${ZIMAGE_MOD}" bs=34463421 seek=1 conv=notrunc || exit 1
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file_size_le "${VMLINUX_MOD}" | dd of="${ZIMAGE_MOD}" bs=34479132 seek=1 conv=notrunc || exit 1
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# RUN_SIZE=$(objdump -h "${VMLINUX_MOD}" | calc_run_size)
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# size_le "${RUN_SIZE}" | dd of="${ZIMAGE_MOD}" bs=34626904 seek=1 conv=notrunc || exit 1
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size_le "$((16#$(crc32 "${ZIMAGE_MOD}" | awk '{print $1}') ^ 0xFFFFFFFF))" | dd of="${ZIMAGE_MOD}" conv=notrunc oflag=append || exit 1
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fi
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