| #! /bin/bash |
| |
| # Copyright (C) 2015 Frank Rowand |
| # |
| # This program is free software; you can redistribute it and/or modify |
| # it under the terms of the GNU General Public License as published by |
| # the Free Software Foundation; version 2 of the License. |
| |
| |
| usage() { |
| |
| # use spaces instead of tabs in the usage message |
| cat >&2 <<eod |
| |
| Usage: |
| |
| `basename $0` DTx |
| decompile DTx |
| |
| `basename $0` DTx_1 DTx_2 |
| diff DTx_1 and DTx_2 |
| |
| |
| -f print full dts in diff (--unified=99999) |
| -h synonym for --help |
| -help synonym for --help |
| --help print this message and exit |
| -s SRCTREE linux kernel source tree is at path SRCTREE |
| (default is current directory) |
| -S linux kernel source tree is at root of current git repo |
| -u unsorted, do not sort DTx |
| |
| |
| Each DTx is processed by the dtc compiler to produce a sorted dts source |
| file. If DTx is a dts source file then it is pre-processed in the same |
| manner as done for the compile of the dts source file in the Linux kernel |
| build system ('#include' and '/include/' directives are processed). |
| |
| If two DTx are provided, the resulting dts source files are diffed. |
| |
| If DTx is a directory, it is treated as a DT subtree, such as |
| /proc/device-tree. |
| |
| If DTx contains the binary blob magic value in the first four bytes, |
| it is treated as a binary blob (aka .dtb or FDT). |
| |
| Otherwise DTx is treated as a dts source file (aka .dts). |
| |
| If this script is not run from the root of the linux source tree, |
| and DTx utilizes '#include' or '/include/' then the path of the |
| linux source tree can be provided by '-s SRCTREE' or '-S' so that |
| include paths will be set properly. |
| |
| The shell variable \${ARCH} must provide the architecture containing |
| the dts source file for include paths to be set properly for '#include' |
| or '/include/' to be processed. |
| |
| If DTx_1 and DTx_2 are in different architectures, then this script |
| may not work since \${ARCH} is part of the include path. Two possible |
| workarounds: |
| |
| `basename $0` \\ |
| <(ARCH=arch_of_dtx_1 `basename $0` DTx_1) \\ |
| <(ARCH=arch_of_dtx_2 `basename $0` DTx_2) |
| |
| `basename $0` ARCH=arch_of_dtx_1 DTx_1 >tmp_dtx_1.dts |
| `basename $0` ARCH=arch_of_dtx_2 DTx_2 >tmp_dtx_2.dts |
| `basename $0` tmp_dtx_1.dts tmp_dtx_2.dts |
| rm tmp_dtx_1.dts tmp_dtx_2.dts |
| |
| If DTx_1 and DTx_2 are in different directories, then this script will |
| add the path of DTx_1 and DTx_2 to the include paths. If DTx_2 includes |
| a local file that exists in both the path of DTx_1 and DTx_2 then the |
| file in the path of DTx_1 will incorrectly be included. Possible |
| workaround: |
| |
| `basename $0` DTx_1 >tmp_dtx_1.dts |
| `basename $0` DTx_2 >tmp_dtx_2.dts |
| `basename $0` tmp_dtx_1.dts tmp_dtx_2.dts |
| rm tmp_dtx_1.dts tmp_dtx_2.dts |
| |
| eod |
| } |
| |
| |
| compile_to_dts() { |
| |
| dtx="$1" |
| |
| if [ -d "${dtx}" ] ; then |
| |
| # ----- input is file tree |
| |
| if ( ! ${DTC} -I fs ${dtx} ) ; then |
| exit 3 |
| fi |
| |
| elif [ -f "${dtx}" ] && [ -r "${dtx}" ] ; then |
| |
| magic=`hexdump -n 4 -e '/1 "%02x"' ${dtx}` |
| if [ "${magic}" = "d00dfeed" ] ; then |
| |
| # ----- input is FDT (binary blob) |
| |
| if ( ! ${DTC} -I dtb ${dtx} ) ; then |
| exit 3 |
| fi |
| |
| return |
| |
| fi |
| |
| # ----- input is DTS (source) |
| |
| if ( cpp ${cpp_flags} -x assembler-with-cpp ${dtx} \ |
| | ${DTC} -I dts ) ; then |
| return |
| fi |
| |
| echo "" >&2 |
| echo "Possible hints to resolve the above error:" >&2 |
| echo " (hints might not fix the problem)" >&2 |
| |
| hint_given=0 |
| |
| if [ "${ARCH}" = "" ] ; then |
| hint_given=1 |
| echo "" >&2 |
| echo " shell variable \$ARCH not set" >&2 |
| fi |
| |
| dtx_arch=`echo "/${dtx}" | sed -e 's|.*/arch/||' -e 's|/.*||'` |
| |
| if [ "${dtx_arch}" != "" -a "${dtx_arch}" != "${ARCH}" ] ; then |
| hint_given=1 |
| echo "" >&2 |
| echo " architecture ${dtx_arch} is in file path," >&2 |
| echo " but does not match shell variable \$ARCH" >&2 |
| echo " >>\$ARCH<< is: >>${ARCH}<<" >&2 |
| fi |
| |
| if [ ! -d ${srctree}/arch/${ARCH} ] ; then |
| hint_given=1 |
| echo "" >&2 |
| echo " ${srctree}/arch/${ARCH}/ does not exist" >&2 |
| echo " Is \$ARCH='${ARCH}' correct?" >&2 |
| echo " Possible fix: use '-s' option" >&2 |
| |
| git_root=`git rev-parse --show-toplevel 2>/dev/null` |
| if [ -d ${git_root}/arch/ ] ; then |
| echo " Possible fix: use '-S' option" >&2 |
| fi |
| fi |
| |
| if [ $hint_given = 0 ] ; then |
| echo "" >&2 |
| echo " No hints available." >&2 |
| fi |
| |
| echo "" >&2 |
| |
| exit 3 |
| |
| else |
| echo "" >&2 |
| echo "ERROR: ${dtx} does not exist or is not readable" >&2 |
| echo "" >&2 |
| exit 2 |
| fi |
| |
| } |
| |
| |
| # ----- start of script |
| |
| cmd_diff=0 |
| diff_flags="-u" |
| dtx_file_1="" |
| dtx_file_2="" |
| dtc_sort="-s" |
| help=0 |
| srctree="" |
| |
| |
| while [ $# -gt 0 ] ; do |
| |
| case $1 in |
| |
| -f ) |
| diff_flags="--unified=999999" |
| shift |
| ;; |
| |
| -h | -help | --help ) |
| help=1 |
| shift |
| ;; |
| |
| -s ) |
| srctree="$2" |
| shift 2 |
| ;; |
| |
| -S ) |
| git_root=`git rev-parse --show-toplevel 2>/dev/null` |
| srctree="${git_root}" |
| shift |
| ;; |
| |
| -u ) |
| dtc_sort="" |
| shift |
| ;; |
| |
| *) |
| if [ "${dtx_file_1}" = "" ] ; then |
| dtx_file_1="$1" |
| elif [ "${dtx_file_2}" = "" ] ; then |
| dtx_file_2="$1" |
| else |
| echo "" >&2 |
| echo "ERROR: Unexpected parameter: $1" >&2 |
| echo "" >&2 |
| exit 2 |
| fi |
| shift |
| ;; |
| |
| esac |
| |
| done |
| |
| if [ "${srctree}" = "" ] ; then |
| srctree="." |
| fi |
| |
| if [ "${dtx_file_2}" != "" ]; then |
| cmd_diff=1 |
| fi |
| |
| if (( ${help} )) ; then |
| usage |
| exit 1 |
| fi |
| |
| # this must follow check for ${help} |
| if [ "${dtx_file_1}" = "" ]; then |
| echo "" >&2 |
| echo "ERROR: parameter DTx required" >&2 |
| echo "" >&2 |
| exit 2 |
| fi |
| |
| |
| # ----- prefer dtc from linux kernel, allow fallback to dtc in $PATH |
| |
| if [ "${KBUILD_OUTPUT:0:2}" = ".." ] ; then |
| __KBUILD_OUTPUT="${srctree}/${KBUILD_OUTPUT}" |
| elif [ "${KBUILD_OUTPUT}" = "" ] ; then |
| __KBUILD_OUTPUT="." |
| else |
| __KBUILD_OUTPUT="${KBUILD_OUTPUT}" |
| fi |
| |
| DTC="${__KBUILD_OUTPUT}/scripts/dtc/dtc" |
| |
| if [ ! -x ${DTC} ] ; then |
| __DTC="dtc" |
| if grep -q "^CONFIG_DTC=y" ${__KBUILD_OUTPUT}/.config ; then |
| make_command=' |
| make scripts' |
| else |
| make_command=' |
| Enable CONFIG_DTC in the kernel configuration |
| make scripts' |
| fi |
| if ( ! which ${__DTC} >/dev/null ) ; then |
| |
| # use spaces instead of tabs in the error message |
| cat >&2 <<eod |
| |
| ERROR: unable to find a 'dtc' program |
| |
| Preferred 'dtc' (built from Linux kernel source tree) was not found or |
| is not executable. |
| |
| 'dtc' is: ${DTC} |
| |
| If it does not exist, create it from the root of the Linux source tree: |
| ${make_command} |
| |
| If not at the root of the Linux kernel source tree -s SRCTREE or -S |
| may need to be specified to find 'dtc'. |
| |
| If 'O=\${dir}' is specified in your Linux builds, this script requires |
| 'export KBUILD_OUTPUT=\${dir}' or add \${dir}/scripts/dtc to \$PATH |
| before running. |
| |
| If \${KBUILD_OUTPUT} is a relative path, then '-s SRCDIR', -S, or run |
| this script from the root of the Linux kernel source tree is required. |
| |
| Fallback '${__DTC}' was also not in \${PATH} or is not executable. |
| |
| eod |
| exit 2 |
| fi |
| DTC=${__DTC} |
| fi |
| |
| |
| # ----- cpp and dtc flags same as for linux source tree build of .dtb files, |
| # plus directories of the dtx file(s) |
| |
| dtx_path_1_dtc_include="-i `dirname ${dtx_file_1}`" |
| |
| dtx_path_2_dtc_include="" |
| if (( ${cmd_diff} )) ; then |
| dtx_path_2_dtc_include="-i `dirname ${dtx_file_2}`" |
| fi |
| |
| cpp_flags="\ |
| -nostdinc \ |
| -I${srctree}/arch/${ARCH}/boot/dts \ |
| -I${srctree}/arch/${ARCH}/boot/dts/include \ |
| -I${srctree}/drivers/of/testcase-data \ |
| -undef -D__DTS__" |
| |
| dtc_flags="\ |
| -i ${srctree}/arch/${ARCH}/boot/dts/ \ |
| -i ${srctree}/kernel/dts \ |
| ${dtx_path_1_dtc_include} \ |
| ${dtx_path_2_dtc_include}" |
| |
| DTC="${DTC} ${dtc_flags} -O dts -qq -f ${dtc_sort} -o -" |
| |
| |
| # ----- do the diff or decompile |
| |
| if (( ${cmd_diff} )) ; then |
| |
| diff ${diff_flags} \ |
| <(compile_to_dts "${dtx_file_1}") \ |
| <(compile_to_dts "${dtx_file_2}") |
| |
| else |
| |
| compile_to_dts "${dtx_file_1}" |
| |
| fi |
