1#! /bin/bash 2 3# Copyright (C) 2015 Frank Rowand 4# 5# This program is free software; you can redistribute it and/or modify 6# it under the terms of the GNU General Public License as published by 7# the Free Software Foundation; version 2 of the License. 8 9 10usage() { 11 12 # use spaces instead of tabs in the usage message 13 cat >&2 <<eod 14 15Usage: 16 17 `basename $0` DTx 18 decompile DTx 19 20 `basename $0` DTx_1 DTx_2 21 diff DTx_1 and DTx_2 22 23 24 -f print full dts in diff (--unified=99999) 25 -h synonym for --help 26 -help synonym for --help 27 --help print this message and exit 28 -s SRCTREE linux kernel source tree is at path SRCTREE 29 (default is current directory) 30 -S linux kernel source tree is at root of current git repo 31 -u unsorted, do not sort DTx 32 33 34Each DTx is processed by the dtc compiler to produce a sorted dts source 35file. If DTx is a dts source file then it is pre-processed in the same 36manner as done for the compile of the dts source file in the Linux kernel 37build system ('#include' and '/include/' directives are processed). 38 39If two DTx are provided, the resulting dts source files are diffed. 40 41If DTx is a directory, it is treated as a DT subtree, such as 42 /proc/device-tree. 43 44If DTx contains the binary blob magic value in the first four bytes, 45 it is treated as a binary blob (aka .dtb or FDT). 46 47Otherwise DTx is treated as a dts source file (aka .dts). 48 49 If this script is not run from the root of the linux source tree, 50 and DTx utilizes '#include' or '/include/' then the path of the 51 linux source tree can be provided by '-s SRCTREE' or '-S' so that 52 include paths will be set properly. 53 54 The shell variable \${ARCH} must provide the architecture containing 55 the dts source file for include paths to be set properly for '#include' 56 or '/include/' to be processed. 57 58 If DTx_1 and DTx_2 are in different architectures, then this script 59 may not work since \${ARCH} is part of the include path. Two possible 60 workarounds: 61 62 `basename $0` \\ 63 <(ARCH=arch_of_dtx_1 `basename $0` DTx_1) \\ 64 <(ARCH=arch_of_dtx_2 `basename $0` DTx_2) 65 66 `basename $0` ARCH=arch_of_dtx_1 DTx_1 >tmp_dtx_1.dts 67 `basename $0` ARCH=arch_of_dtx_2 DTx_2 >tmp_dtx_2.dts 68 `basename $0` tmp_dtx_1.dts tmp_dtx_2.dts 69 rm tmp_dtx_1.dts tmp_dtx_2.dts 70 71 If DTx_1 and DTx_2 are in different directories, then this script will 72 add the path of DTx_1 and DTx_2 to the include paths. If DTx_2 includes 73 a local file that exists in both the path of DTx_1 and DTx_2 then the 74 file in the path of DTx_1 will incorrectly be included. Possible 75 workaround: 76 77 `basename $0` DTx_1 >tmp_dtx_1.dts 78 `basename $0` DTx_2 >tmp_dtx_2.dts 79 `basename $0` tmp_dtx_1.dts tmp_dtx_2.dts 80 rm tmp_dtx_1.dts tmp_dtx_2.dts 81 82eod 83} 84 85 86compile_to_dts() { 87 88 dtx="$1" 89 90 if [ -d "${dtx}" ] ; then 91 92 # ----- input is file tree 93 94 if ( ! ${DTC} -I fs ${dtx} ) ; then 95 exit 3 96 fi 97 98 elif [ -f "${dtx}" ] && [ -r "${dtx}" ] ; then 99 100 magic=`hexdump -n 4 -e '/1 "%02x"' ${dtx}` 101 if [ "${magic}" = "d00dfeed" ] ; then 102 103 # ----- input is FDT (binary blob) 104 105 if ( ! ${DTC} -I dtb ${dtx} ) ; then 106 exit 3 107 fi 108 109 return 110 111 fi 112 113 # ----- input is DTS (source) 114 115 if ( cpp ${cpp_flags} -x assembler-with-cpp ${dtx} \ 116 | ${DTC} -I dts ) ; then 117 return 118 fi 119 120 echo "" >&2 121 echo "Possible hints to resolve the above error:" >&2 122 echo " (hints might not fix the problem)" >&2 123 124 hint_given=0 125 126 if [ "${ARCH}" = "" ] ; then 127 hint_given=1 128 echo "" >&2 129 echo " shell variable \$ARCH not set" >&2 130 fi 131 132 dtx_arch=`echo "/${dtx}" | sed -e 's|.*/arch/||' -e 's|/.*||'` 133 134 if [ "${dtx_arch}" != "" -a "${dtx_arch}" != "${ARCH}" ] ; then 135 hint_given=1 136 echo "" >&2 137 echo " architecture ${dtx_arch} is in file path," >&2 138 echo " but does not match shell variable \$ARCH" >&2 139 echo " >>\$ARCH<< is: >>${ARCH}<<" >&2 140 fi 141 142 if [ ! -d ${srctree}/arch/${ARCH} ] ; then 143 hint_given=1 144 echo "" >&2 145 echo " ${srctree}/arch/${ARCH}/ does not exist" >&2 146 echo " Is \$ARCH='${ARCH}' correct?" >&2 147 echo " Possible fix: use '-s' option" >&2 148 149 git_root=`git rev-parse --show-toplevel 2>/dev/null` 150 if [ -d ${git_root}/arch/ ] ; then 151 echo " Possible fix: use '-S' option" >&2 152 fi 153 fi 154 155 if [ $hint_given = 0 ] ; then 156 echo "" >&2 157 echo " No hints available." >&2 158 fi 159 160 echo "" >&2 161 162 exit 3 163 164 else 165 echo "" >&2 166 echo "ERROR: ${dtx} does not exist or is not readable" >&2 167 echo "" >&2 168 exit 2 169 fi 170 171} 172 173 174# ----- start of script 175 176cmd_diff=0 177diff_flags="-u" 178dtx_file_1="" 179dtx_file_2="" 180dtc_sort="-s" 181help=0 182srctree="" 183 184 185while [ $# -gt 0 ] ; do 186 187 case $1 in 188 189 -f ) 190 diff_flags="--unified=999999" 191 shift 192 ;; 193 194 -h | -help | --help ) 195 help=1 196 shift 197 ;; 198 199 -s ) 200 srctree="$2" 201 shift 2 202 ;; 203 204 -S ) 205 git_root=`git rev-parse --show-toplevel 2>/dev/null` 206 srctree="${git_root}" 207 shift 208 ;; 209 210 -u ) 211 dtc_sort="" 212 shift 213 ;; 214 215 *) 216 if [ "${dtx_file_1}" = "" ] ; then 217 dtx_file_1="$1" 218 elif [ "${dtx_file_2}" = "" ] ; then 219 dtx_file_2="$1" 220 else 221 echo "" >&2 222 echo "ERROR: Unexpected parameter: $1" >&2 223 echo "" >&2 224 exit 2 225 fi 226 shift 227 ;; 228 229 esac 230 231done 232 233if [ "${srctree}" = "" ] ; then 234 srctree="." 235fi 236 237if [ "${dtx_file_2}" != "" ]; then 238 cmd_diff=1 239fi 240 241if (( ${help} )) ; then 242 usage 243 exit 1 244fi 245 246# this must follow check for ${help} 247if [ "${dtx_file_1}" = "" ]; then 248 echo "" >&2 249 echo "ERROR: parameter DTx required" >&2 250 echo "" >&2 251 exit 2 252fi 253 254 255# ----- prefer dtc from linux kernel, allow fallback to dtc in $PATH 256 257if [ "${KBUILD_OUTPUT:0:2}" = ".." ] ; then 258 __KBUILD_OUTPUT="${srctree}/${KBUILD_OUTPUT}" 259elif [ "${KBUILD_OUTPUT}" = "" ] ; then 260 __KBUILD_OUTPUT="." 261else 262 __KBUILD_OUTPUT="${KBUILD_OUTPUT}" 263fi 264 265DTC="${__KBUILD_OUTPUT}/scripts/dtc/dtc" 266 267if [ ! -x ${DTC} ] ; then 268 __DTC="dtc" 269 if grep -q "^CONFIG_DTC=y" ${__KBUILD_OUTPUT}/.config ; then 270 make_command=' 271 make scripts' 272 else 273 make_command=' 274 Enable CONFIG_DTC in the kernel configuration 275 make scripts' 276 fi 277 if ( ! which ${__DTC} >/dev/null ) ; then 278 279 # use spaces instead of tabs in the error message 280 cat >&2 <<eod 281 282ERROR: unable to find a 'dtc' program 283 284 Preferred 'dtc' (built from Linux kernel source tree) was not found or 285 is not executable. 286 287 'dtc' is: ${DTC} 288 289 If it does not exist, create it from the root of the Linux source tree: 290${make_command} 291 292 If not at the root of the Linux kernel source tree -s SRCTREE or -S 293 may need to be specified to find 'dtc'. 294 295 If 'O=\${dir}' is specified in your Linux builds, this script requires 296 'export KBUILD_OUTPUT=\${dir}' or add \${dir}/scripts/dtc to \$PATH 297 before running. 298 299 If \${KBUILD_OUTPUT} is a relative path, then '-s SRCDIR', -S, or run 300 this script from the root of the Linux kernel source tree is required. 301 302 Fallback '${__DTC}' was also not in \${PATH} or is not executable. 303 304eod 305 exit 2 306 fi 307 DTC=${__DTC} 308fi 309 310 311# ----- cpp and dtc flags same as for linux source tree build of .dtb files, 312# plus directories of the dtx file(s) 313 314dtx_path_1_dtc_include="-i `dirname ${dtx_file_1}`" 315 316dtx_path_2_dtc_include="" 317if (( ${cmd_diff} )) ; then 318 dtx_path_2_dtc_include="-i `dirname ${dtx_file_2}`" 319fi 320 321cpp_flags="\ 322 -nostdinc \ 323 -I${srctree}/arch/${ARCH}/boot/dts \ 324 -I${srctree}/arch/${ARCH}/boot/dts/include \ 325 -I${srctree}/drivers/of/testcase-data \ 326 -undef -D__DTS__" 327 328dtc_flags="\ 329 -i ${srctree}/arch/${ARCH}/boot/dts/ \ 330 -i ${srctree}/kernel/dts \ 331 ${dtx_path_1_dtc_include} \ 332 ${dtx_path_2_dtc_include}" 333 334DTC="${DTC} ${dtc_flags} -O dts -qq -f ${dtc_sort} -o -" 335 336 337# ----- do the diff or decompile 338 339if (( ${cmd_diff} )) ; then 340 341 diff ${diff_flags} \ 342 <(compile_to_dts "${dtx_file_1}") \ 343 <(compile_to_dts "${dtx_file_2}") 344 345else 346 347 compile_to_dts "${dtx_file_1}" 348 349fi 350