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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 dtc_include="$2"
90
91 if [ -d "${dtx}" ] ; then
92
93 # ----- input is file tree
94
95 if ( ! ${DTC} -I fs ${dtx} ) ; then
96 exit 3
97 fi
98
99 elif [ -f "${dtx}" ] && [ -r "${dtx}" ] ; then
100
101 magic=`hexdump -n 4 -e '/1 "%02x"' ${dtx}`
102 if [ "${magic}" = "d00dfeed" ] ; then
103
104 # ----- input is FDT (binary blob)
105
106 if ( ! ${DTC} -I dtb ${dtx} ) ; then
107 exit 3
108 fi
109
110 return
111
112 fi
113
114 # ----- input is DTS (source)
115
116 if ( cpp ${cpp_flags} -x assembler-with-cpp ${dtx} \
117 | ${DTC} ${dtc_include} -I dts ) ; then
118 return
119 fi
120
121 echo "" >&2
122 echo "Possible hints to resolve the above error:" >&2
123 echo " (hints might not fix the problem)" >&2
124
125 hint_given=0
126
127 if [ "${ARCH}" = "" ] ; then
128 hint_given=1
129 echo "" >&2
130 echo " shell variable \$ARCH not set" >&2
131 fi
132
133 dtx_arch=`echo "/${dtx}" | sed -e 's|.*/arch/||' -e 's|/.*||'`
134
135 if [ "${dtx_arch}" != "" -a "${dtx_arch}" != "${ARCH}" ] ; then
136 hint_given=1
137 echo "" >&2
138 echo " architecture ${dtx_arch} is in file path," >&2
139 echo " but does not match shell variable \$ARCH" >&2
140 echo " >>\$ARCH<< is: >>${ARCH}<<" >&2
141 fi
142
143 if [ ! -d ${srctree}/arch/${ARCH} ] ; then
144 hint_given=1
145 echo "" >&2
146 echo " ${srctree}/arch/${ARCH}/ does not exist" >&2
147 echo " Is \$ARCH='${ARCH}' correct?" >&2
148 echo " Possible fix: use '-s' option" >&2
149
150 git_root=`git rev-parse --show-toplevel 2>/dev/null`
151 if [ -d ${git_root}/arch/ ] ; then
152 echo " Possible fix: use '-S' option" >&2
153 fi
154 fi
155
156 if [ $hint_given = 0 ] ; then
157 echo "" >&2
158 echo " No hints available." >&2
159 fi
160
161 echo "" >&2
162
163 exit 3
164
165 else
166 echo "" >&2
167 echo "ERROR: ${dtx} does not exist or is not readable" >&2
168 echo "" >&2
169 exit 2
170 fi
171
172}
173
174
175# ----- start of script
176
177cmd_diff=0
178diff_flags="-u"
179dtx_file_1=""
180dtx_file_2=""
181dtc_sort="-s"
182help=0
183srctree=""
184
185
186while [ $# -gt 0 ] ; do
187
188 case $1 in
189
190 -f )
191 diff_flags="--unified=999999"
192 shift
193 ;;
194
195 -h | -help | --help )
196 help=1
197 shift
198 ;;
199
200 -s )
201 srctree="$2"
202 shift 2
203 ;;
204
205 -S )
206 git_root=`git rev-parse --show-toplevel 2>/dev/null`
207 srctree="${git_root}"
208 shift
209 ;;
210
211 -u )
212 dtc_sort=""
213 shift
214 ;;
215
216 *)
217 if [ "${dtx_file_1}" = "" ] ; then
218 dtx_file_1="$1"
219 elif [ "${dtx_file_2}" = "" ] ; then
220 dtx_file_2="$1"
221 else
222 echo "" >&2
223 echo "ERROR: Unexpected parameter: $1" >&2
224 echo "" >&2
225 exit 2
226 fi
227 shift
228 ;;
229
230 esac
231
232done
233
234if [ "${srctree}" = "" ] ; then
235 srctree="."
236fi
237
238if [ "${dtx_file_2}" != "" ]; then
239 cmd_diff=1
240fi
241
242if (( ${help} )) ; then
243 usage
244 exit 1
245fi
246
247# this must follow check for ${help}
248if [ "${dtx_file_1}" = "" ]; then
249 echo "" >&2
250 echo "ERROR: parameter DTx required" >&2
251 echo "" >&2
252 exit 2
253fi
254
255
256# ----- prefer dtc from linux kernel, allow fallback to dtc in $PATH
257
258if [ "${KBUILD_OUTPUT:0:2}" = ".." ] ; then
259 __KBUILD_OUTPUT="${srctree}/${KBUILD_OUTPUT}"
260elif [ "${KBUILD_OUTPUT}" = "" ] ; then
261 __KBUILD_OUTPUT="."
262else
263 __KBUILD_OUTPUT="${KBUILD_OUTPUT}"
264fi
265
266DTC="${__KBUILD_OUTPUT}/scripts/dtc/dtc"
267
268if [ ! -x ${DTC} ] ; then
269 __DTC="dtc"
270 if grep -q "^CONFIG_DTC=y" ${__KBUILD_OUTPUT}/.config 2>/dev/null; then
271 make_command='
272 make scripts'
273 else
274 make_command='
275 Enable CONFIG_DTC in the kernel configuration
276 make scripts'
277 fi
278 if ( ! which ${__DTC} >/dev/null ) ; then
279
280 # use spaces instead of tabs in the error message
281 cat >&2 <<eod
282
283ERROR: unable to find a 'dtc' program
284
285 Preferred 'dtc' (built from Linux kernel source tree) was not found or
286 is not executable.
287
288 'dtc' is: ${DTC}
289
290 If it does not exist, create it from the root of the Linux source tree:
291${make_command}
292
293 If not at the root of the Linux kernel source tree -s SRCTREE or -S
294 may need to be specified to find 'dtc'.
295
296 If 'O=\${dir}' is specified in your Linux builds, this script requires
297 'export KBUILD_OUTPUT=\${dir}' or add \${dir}/scripts/dtc to \$PATH
298 before running.
299
300 If \${KBUILD_OUTPUT} is a relative path, then '-s SRCDIR', -S, or run
301 this script from the root of the Linux kernel source tree is required.
302
303 Fallback '${__DTC}' was also not in \${PATH} or is not executable.
304
305eod
306 exit 2
307 fi
308 DTC=${__DTC}
309fi
310
311
312# ----- cpp and dtc flags same as for linux source tree build of .dtb files,
313# plus directories of the dtx file(s)
314
315dtx_path_1_dtc_include="-i `dirname ${dtx_file_1}`"
316
317dtx_path_2_dtc_include=""
318if (( ${cmd_diff} )) ; then
319 dtx_path_2_dtc_include="-i `dirname ${dtx_file_2}`"
320fi
321
322cpp_flags="\
323 -nostdinc \
324 -I${srctree}/scripts/dtc/include-prefixes \
325 -undef -D__DTS__"
326
327DTC="\
328 ${DTC} \
329 -i ${srctree}/scripts/dtc/include-prefixes \
330 -O dts -qq -f ${dtc_sort} -o -"
331
332
333# ----- do the diff or decompile
334
335if (( ${cmd_diff} )) ; then
336
337 diff ${diff_flags} --label "${dtx_file_1}" --label "${dtx_file_2}" \
338 <(compile_to_dts "${dtx_file_1}" "${dtx_path_1_dtc_include}") \
339 <(compile_to_dts "${dtx_file_2}" "${dtx_path_2_dtc_include}")
340
341else
342
343 compile_to_dts "${dtx_file_1}" "${dtx_path_1_dtc_include}"
344
345fi
1#! /bin/bash
2# SPDX-License-Identifier: GPL-2.0-only
3
4# Copyright (C) 2015 Frank Rowand
5#
6
7
8usage() {
9
10 # use spaces instead of tabs in the usage message
11 cat >&2 <<eod
12
13Usage:
14
15 `basename $0` DTx
16 decompile DTx
17
18 `basename $0` DTx_1 DTx_2
19 diff DTx_1 and DTx_2
20
21
22 --annotate synonym for -T
23 --color synonym for -c (requires diff with --color support)
24 -c enable colored output
25 -f print full dts in diff (--unified=99999)
26 -h synonym for --help
27 -help synonym for --help
28 --help print this message and exit
29 -s SRCTREE linux kernel source tree is at path SRCTREE
30 (default is current directory)
31 -S linux kernel source tree is at root of current git repo
32 -T annotate output .dts with input source file and line
33 (-T -T for more details)
34 -u unsorted, do not sort DTx
35
36
37Each DTx is processed by the dtc compiler to produce a sorted dts source
38file. If DTx is a dts source file then it is pre-processed in the same
39manner as done for the compile of the dts source file in the Linux kernel
40build system ('#include' and '/include/' directives are processed).
41
42If two DTx are provided, the resulting dts source files are diffed.
43
44If DTx is a directory, it is treated as a DT subtree, such as
45 /proc/device-tree.
46
47If DTx contains the binary blob magic value in the first four bytes,
48 it is treated as a binary blob (aka .dtb or FDT).
49
50Otherwise DTx is treated as a dts source file (aka .dts).
51
52 If this script is not run from the root of the linux source tree,
53 and DTx utilizes '#include' or '/include/' then the path of the
54 linux source tree can be provided by '-s SRCTREE' or '-S' so that
55 include paths will be set properly.
56
57 The shell variable \${ARCH} must provide the architecture containing
58 the dts source file for include paths to be set properly for '#include'
59 or '/include/' to be processed.
60
61 If DTx_1 and DTx_2 are in different architectures, then this script
62 may not work since \${ARCH} is part of the include path. Two possible
63 workarounds:
64
65 `basename $0` \\
66 <(ARCH=arch_of_dtx_1 `basename $0` DTx_1) \\
67 <(ARCH=arch_of_dtx_2 `basename $0` DTx_2)
68
69 `basename $0` ARCH=arch_of_dtx_1 DTx_1 >tmp_dtx_1.dts
70 `basename $0` ARCH=arch_of_dtx_2 DTx_2 >tmp_dtx_2.dts
71 `basename $0` tmp_dtx_1.dts tmp_dtx_2.dts
72 rm tmp_dtx_1.dts tmp_dtx_2.dts
73
74 If DTx_1 and DTx_2 are in different directories, then this script will
75 add the path of DTx_1 and DTx_2 to the include paths. If DTx_2 includes
76 a local file that exists in both the path of DTx_1 and DTx_2 then the
77 file in the path of DTx_1 will incorrectly be included. Possible
78 workaround:
79
80 `basename $0` DTx_1 >tmp_dtx_1.dts
81 `basename $0` DTx_2 >tmp_dtx_2.dts
82 `basename $0` tmp_dtx_1.dts tmp_dtx_2.dts
83 rm tmp_dtx_1.dts tmp_dtx_2.dts
84
85eod
86}
87
88
89compile_to_dts() {
90
91 dtx="$1"
92 dtc_include="$2"
93
94 if [ -d "${dtx}" ] ; then
95
96 # ----- input is file tree
97
98 if ( ! ${DTC} -I fs ${dtx} ) ; then
99 exit 3
100 fi
101
102 elif [ -f "${dtx}" ] && [ -r "${dtx}" ] ; then
103
104 magic=`hexdump -n 4 -e '/1 "%02x"' ${dtx}`
105 if [ "${magic}" = "d00dfeed" ] ; then
106
107 # ----- input is FDT (binary blob)
108
109 if ( ! ${DTC} -I dtb ${dtx} ) ; then
110 exit 3
111 fi
112
113 return
114
115 fi
116
117 # ----- input is DTS (source)
118
119 if ( cpp ${cpp_flags} -x assembler-with-cpp ${dtx} \
120 | ${DTC} ${dtc_include} -I dts ) ; then
121 return
122 fi
123
124 echo "" >&2
125 echo "Possible hints to resolve the above error:" >&2
126 echo " (hints might not fix the problem)" >&2
127
128 hint_given=0
129
130 if [ "${ARCH}" = "" ] ; then
131 hint_given=1
132 echo "" >&2
133 echo " shell variable \$ARCH not set" >&2
134 fi
135
136 dtx_arch=`echo "/${dtx}" | sed -e 's|.*/arch/||' -e 's|/.*||'`
137
138 if [ "${dtx_arch}" != "" -a "${dtx_arch}" != "${ARCH}" ] ; then
139 hint_given=1
140 echo "" >&2
141 echo " architecture ${dtx_arch} is in file path," >&2
142 echo " but does not match shell variable \$ARCH" >&2
143 echo " >>\$ARCH<< is: >>${ARCH}<<" >&2
144 fi
145
146 if [ ! -d ${srctree}/arch/${ARCH} ] ; then
147 hint_given=1
148 echo "" >&2
149 echo " ${srctree}/arch/${ARCH}/ does not exist" >&2
150 echo " Is \$ARCH='${ARCH}' correct?" >&2
151 echo " Possible fix: use '-s' option" >&2
152
153 git_root=`git rev-parse --show-toplevel 2>/dev/null`
154 if [ -d ${git_root}/arch/ ] ; then
155 echo " Possible fix: use '-S' option" >&2
156 fi
157 fi
158
159 if [ $hint_given = 0 ] ; then
160 echo "" >&2
161 echo " No hints available." >&2
162 fi
163
164 echo "" >&2
165
166 exit 3
167
168 else
169 echo "" >&2
170 echo "ERROR: ${dtx} does not exist or is not readable" >&2
171 echo "" >&2
172 exit 2
173 fi
174
175}
176
177
178# ----- start of script
179
180annotate=""
181cmd_diff=0
182diff_flags="-u"
183diff_color=""
184dtx_file_1=""
185dtx_file_2=""
186dtc_sort="-s"
187help=0
188srctree=""
189
190
191while [ $# -gt 0 ] ; do
192
193 case $1 in
194
195 -c | --color )
196 if diff --color /dev/null /dev/null 2>/dev/null ; then
197 diff_color="--color=always"
198 fi
199 shift
200 ;;
201
202 -f )
203 diff_flags="--unified=999999"
204 shift
205 ;;
206
207 -h | -help | --help )
208 help=1
209 shift
210 ;;
211
212 -s )
213 srctree="$2"
214 shift 2
215 ;;
216
217 -S )
218 git_root=`git rev-parse --show-toplevel 2>/dev/null`
219 srctree="${git_root}"
220 shift
221 ;;
222
223 -T | --annotate )
224 if [ "${annotate}" = "" ] ; then
225 annotate="-T"
226 elif [ "${annotate}" = "-T" ] ; then
227 annotate="-T -T"
228 fi
229 shift
230 ;;
231 -u )
232 dtc_sort=""
233 shift
234 ;;
235
236 *)
237 if [ "${dtx_file_1}" = "" ] ; then
238 dtx_file_1="$1"
239 elif [ "${dtx_file_2}" = "" ] ; then
240 dtx_file_2="$1"
241 else
242 echo "" >&2
243 echo "ERROR: Unexpected parameter: $1" >&2
244 echo "" >&2
245 exit 2
246 fi
247 shift
248 ;;
249
250 esac
251
252done
253
254if [ "${srctree}" = "" ] ; then
255 srctree="."
256fi
257
258if [ "${dtx_file_2}" != "" ]; then
259 cmd_diff=1
260fi
261
262if (( ${help} )) ; then
263 usage
264 exit 1
265fi
266
267# this must follow check for ${help}
268if [ "${dtx_file_1}" = "" ]; then
269 echo "" >&2
270 echo "ERROR: parameter DTx required" >&2
271 echo "" >&2
272 exit 2
273fi
274
275
276# ----- prefer dtc from linux kernel, allow fallback to dtc in $PATH
277
278if [ "${KBUILD_OUTPUT:0:2}" = ".." ] ; then
279 __KBUILD_OUTPUT="${srctree}/${KBUILD_OUTPUT}"
280elif [ "${KBUILD_OUTPUT}" = "" ] ; then
281 __KBUILD_OUTPUT="."
282else
283 __KBUILD_OUTPUT="${KBUILD_OUTPUT}"
284fi
285
286DTC="${__KBUILD_OUTPUT}/scripts/dtc/dtc"
287
288if [ ! -x ${DTC} ] ; then
289 __DTC="dtc"
290 if grep -q "^CONFIG_DTC=y" ${__KBUILD_OUTPUT}/.config 2>/dev/null; then
291 make_command='
292 make scripts'
293 else
294 make_command='
295 Enable CONFIG_DTC in the kernel configuration
296 make scripts'
297 fi
298 if ( ! which ${__DTC} >/dev/null ) ; then
299
300 # use spaces instead of tabs in the error message
301 cat >&2 <<eod
302
303ERROR: unable to find a 'dtc' program
304
305 Preferred 'dtc' (built from Linux kernel source tree) was not found or
306 is not executable.
307
308 'dtc' is: ${DTC}
309
310 If it does not exist, create it from the root of the Linux source tree:
311${make_command}
312
313 If not at the root of the Linux kernel source tree -s SRCTREE or -S
314 may need to be specified to find 'dtc'.
315
316 If 'O=\${dir}' is specified in your Linux builds, this script requires
317 'export KBUILD_OUTPUT=\${dir}' or add \${dir}/scripts/dtc to \$PATH
318 before running.
319
320 If \${KBUILD_OUTPUT} is a relative path, then '-s SRCDIR', -S, or run
321 this script from the root of the Linux kernel source tree is required.
322
323 Fallback '${__DTC}' was also not in \${PATH} or is not executable.
324
325eod
326 exit 2
327 fi
328 DTC=${__DTC}
329fi
330
331
332# ----- cpp and dtc flags same as for linux source tree build of .dtb files,
333# plus directories of the dtx file(s)
334
335dtx_path_1_dtc_include="-i `dirname ${dtx_file_1}`"
336
337dtx_path_2_dtc_include=""
338if (( ${cmd_diff} )) ; then
339 dtx_path_2_dtc_include="-i `dirname ${dtx_file_2}`"
340fi
341
342cpp_flags="\
343 -nostdinc \
344 -I${srctree}/scripts/dtc/include-prefixes \
345 -undef -D__DTS__"
346
347DTC="\
348 ${DTC} \
349 -i ${srctree}/scripts/dtc/include-prefixes \
350 -O dts -qq -f ${dtc_sort} ${annotate} -o -"
351
352
353# ----- do the diff or decompile
354
355if (( ${cmd_diff} )) ; then
356
357 diff ${diff_flags} ${diff_color} --label "${dtx_file_1}" --label "${dtx_file_2}" \
358 <(compile_to_dts "${dtx_file_1}" "${dtx_path_1_dtc_include}") \
359 <(compile_to_dts "${dtx_file_2}" "${dtx_path_2_dtc_include}")
360
361else
362
363 compile_to_dts "${dtx_file_1}" "${dtx_path_1_dtc_include}"
364
365fi