]>
Commit | Line | Data |
---|---|---|
10eadc25 FR |
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 | ||
10 | usage() { | |
11 | ||
12 | # use spaces instead of tabs in the usage message | |
13 | cat >&2 <<eod | |
14 | ||
15 | Usage: | |
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 | ||
34 | Each DTx is processed by the dtc compiler to produce a sorted dts source | |
35 | file. If DTx is a dts source file then it is pre-processed in the same | |
36 | manner as done for the compile of the dts source file in the Linux kernel | |
37 | build system ('#include' and '/include/' directives are processed). | |
38 | ||
39 | If two DTx are provided, the resulting dts source files are diffed. | |
40 | ||
41 | If DTx is a directory, it is treated as a DT subtree, such as | |
42 | /proc/device-tree. | |
43 | ||
44 | If 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 | ||
47 | Otherwise 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 | ||
82 | eod | |
83 | } | |
84 | ||
85 | ||
86 | compile_to_dts() { | |
87 | ||
88 | dtx="$1" | |
35f3c984 | 89 | dtc_include="$2" |
10eadc25 FR |
90 | |
91 | if [ -d "${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} \ | |
35f3c984 | 117 | | ${DTC} ${dtc_include} -I dts ) ; then |
10eadc25 FR |
118 | return |
119 | fi | |
120 | ||
121 | echo "" >&2 | |
122 | echo "Possible hints to resolve the above error:" >&2 | |
123 | echo " (hints might not fix the problem)" >&2 | |
124 | ||
125 | hint_given=0 | |
126 | ||
127 | if [ "${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 ${dtx_arch} is in file path," >&2 | |
139 | echo " but does not match shell variable \$ARCH" >&2 | |
60c7f4cb | 140 | echo " >>\$ARCH<< is: >>${ARCH}<<" >&2 |
10eadc25 FR |
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 | ||
177 | cmd_diff=0 | |
178 | diff_flags="-u" | |
179 | dtx_file_1="" | |
180 | dtx_file_2="" | |
181 | dtc_sort="-s" | |
182 | help=0 | |
183 | srctree="" | |
184 | ||
185 | ||
186 | while [ $# -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: $1" >&2 | |
224 | echo "" >&2 | |
225 | exit 2 | |
226 | fi | |
227 | shift | |
228 | ;; | |
229 | ||
230 | esac | |
231 | ||
232 | done | |
233 | ||
234 | if [ "${srctree}" = "" ] ; then | |
235 | srctree="." | |
236 | fi | |
237 | ||
238 | if [ "${dtx_file_2}" != "" ]; then | |
239 | cmd_diff=1 | |
240 | fi | |
241 | ||
242 | if (( ${help} )) ; then | |
243 | usage | |
244 | exit 1 | |
245 | fi | |
246 | ||
247 | # this must follow check for ${help} | |
248 | if [ "${dtx_file_1}" = "" ]; then | |
249 | echo "" >&2 | |
250 | echo "ERROR: parameter DTx required" >&2 | |
251 | echo "" >&2 | |
252 | exit 2 | |
253 | fi | |
254 | ||
255 | ||
256 | # ----- prefer dtc from linux kernel, allow fallback to dtc in $PATH | |
257 | ||
258 | if [ "${KBUILD_OUTPUT:0:2}" = ".." ] ; then | |
259 | __KBUILD_OUTPUT="${srctree}/${KBUILD_OUTPUT}" | |
260 | elif [ "${KBUILD_OUTPUT}" = "" ] ; then | |
261 | __KBUILD_OUTPUT="." | |
262 | else | |
263 | __KBUILD_OUTPUT="${KBUILD_OUTPUT}" | |
264 | fi | |
265 | ||
266 | DTC="${__KBUILD_OUTPUT}/scripts/dtc/dtc" | |
267 | ||
268 | if [ ! -x ${DTC} ] ; then | |
269 | __DTC="dtc" | |
ca0cd118 | 270 | if grep -q "^CONFIG_DTC=y" ${__KBUILD_OUTPUT}/.config 2>/dev/null; then |
60c7f4cb FR |
271 | make_command=' |
272 | make scripts' | |
273 | else | |
274 | make_command=' | |
275 | Enable CONFIG_DTC in the kernel configuration | |
276 | make scripts' | |
277 | fi | |
10eadc25 FR |
278 | if ( ! which ${__DTC} >/dev/null ) ; then |
279 | ||
280 | # use spaces instead of tabs in the error message | |
281 | cat >&2 <<eod | |
282 | ||
283 | ERROR: 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: | |
60c7f4cb | 291 | ${make_command} |
10eadc25 FR |
292 | |
293 | If not at the root of the Linux kernel source tree -s SRCTREE or -S | |
294 | may need to be specified to find 'dtc'. | |
295 | ||
296 | If 'O=\${dir}' is specified in your Linux builds, this script requires | |
297 | 'export KBUILD_OUTPUT=\${dir}' or add \${dir}/scripts/dtc to \$PATH | |
298 | before running. | |
299 | ||
300 | If \${KBUILD_OUTPUT} is a relative path, then '-s SRCDIR', -S, or run | |
301 | this script from the root of the Linux kernel source tree is required. | |
302 | ||
303 | Fallback '${__DTC}' was also not in \${PATH} or is not executable. | |
304 | ||
305 | eod | |
306 | exit 2 | |
307 | fi | |
308 | DTC=${__DTC} | |
309 | fi | |
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 | ||
315 | dtx_path_1_dtc_include="-i `dirname ${dtx_file_1}`" | |
316 | ||
317 | dtx_path_2_dtc_include="" | |
318 | if (( ${cmd_diff} )) ; then | |
319 | dtx_path_2_dtc_include="-i `dirname ${dtx_file_2}`" | |
320 | fi | |
321 | ||
322 | cpp_flags="\ | |
323 | -nostdinc \ | |
b4b201d8 | 324 | -I${srctree}/scripts/dtc/include-prefixes \ |
10eadc25 FR |
325 | -undef -D__DTS__" |
326 | ||
35f3c984 FR |
327 | DTC="\ |
328 | ${DTC} \ | |
329 | -i ${srctree}/scripts/dtc/include-prefixes \ | |
330 | -O dts -qq -f ${dtc_sort} -o -" | |
10eadc25 FR |
331 | |
332 | ||
333 | # ----- do the diff or decompile | |
334 | ||
335 | if (( ${cmd_diff} )) ; then | |
336 | ||
7782b144 | 337 | diff ${diff_flags} --label "${dtx_file_1}" --label "${dtx_file_2}" \ |
35f3c984 FR |
338 | <(compile_to_dts "${dtx_file_1}" "${dtx_path_1_dtc_include}") \ |
339 | <(compile_to_dts "${dtx_file_2}" "${dtx_path_2_dtc_include}") | |
10eadc25 FR |
340 | |
341 | else | |
342 | ||
35f3c984 | 343 | compile_to_dts "${dtx_file_1}" "${dtx_path_1_dtc_include}" |
10eadc25 FR |
344 | |
345 | fi |