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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 | ||
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="$1" | |
89 | ||
90 | if [ -d "${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 | ||
176 | cmd_diff=0 | |
177 | diff_flags="-u" | |
178 | dtx_file_1="" | |
179 | dtx_file_2="" | |
180 | dtc_sort="-s" | |
181 | help=0 | |
182 | srctree="" | |
183 | ||
184 | ||
185 | while [ $# -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: $1" >&2 | |
223 | echo "" >&2 | |
224 | exit 2 | |
225 | fi | |
226 | shift | |
227 | ;; | |
228 | ||
229 | esac | |
230 | ||
231 | done | |
232 | ||
233 | if [ "${srctree}" = "" ] ; then | |
234 | srctree="." | |
235 | fi | |
236 | ||
237 | if [ "${dtx_file_2}" != "" ]; then | |
238 | cmd_diff=1 | |
239 | fi | |
240 | ||
241 | if (( ${help} )) ; then | |
242 | usage | |
243 | exit 1 | |
244 | fi | |
245 | ||
246 | # this must follow check for ${help} | |
247 | if [ "${dtx_file_1}" = "" ]; then | |
248 | echo "" >&2 | |
249 | echo "ERROR: parameter DTx required" >&2 | |
250 | echo "" >&2 | |
251 | exit 2 | |
252 | fi | |
253 | ||
254 | ||
255 | # ----- prefer dtc from linux kernel, allow fallback to dtc in $PATH | |
256 | ||
257 | if [ "${KBUILD_OUTPUT:0:2}" = ".." ] ; then | |
258 | __KBUILD_OUTPUT="${srctree}/${KBUILD_OUTPUT}" | |
259 | elif [ "${KBUILD_OUTPUT}" = "" ] ; then | |
260 | __KBUILD_OUTPUT="." | |
261 | else | |
262 | __KBUILD_OUTPUT="${KBUILD_OUTPUT}" | |
263 | fi | |
264 | ||
265 | DTC="${__KBUILD_OUTPUT}/scripts/dtc/dtc" | |
266 | ||
267 | if [ ! -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 | ||
282 | ERROR: 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 | ||
304 | eod | |
305 | exit 2 | |
306 | fi | |
307 | DTC=${__DTC} | |
308 | fi | |
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 | ||
314 | dtx_path_1_dtc_include="-i `dirname ${dtx_file_1}`" | |
315 | ||
316 | dtx_path_2_dtc_include="" | |
317 | if (( ${cmd_diff} )) ; then | |
318 | dtx_path_2_dtc_include="-i `dirname ${dtx_file_2}`" | |
319 | fi | |
320 | ||
321 | cpp_flags="\ | |
322 | -nostdinc \ | |
323 | -I${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 | ||
328 | dtc_flags="\ | |
329 | -i ${srctree}/arch/${ARCH}/boot/dts/ \ | |
330 | -i ${srctree}/kernel/dts \ | |
331 | ${dtx_path_1_dtc_include} \ | |
332 | ${dtx_path_2_dtc_include}" | |
333 | ||
334 | DTC="${DTC} ${dtc_flags} -O dts -qq -f ${dtc_sort} -o -" | |
335 | ||
336 | ||
337 | # ----- do the diff or decompile | |
338 | ||
339 | if (( ${cmd_diff} )) ; then | |
340 | ||
341 | diff ${diff_flags} \ | |
342 | <(compile_to_dts "${dtx_file_1}") \ | |
343 | <(compile_to_dts "${dtx_file_2}") | |
344 | ||
345 | else | |
346 | ||
347 | compile_to_dts "${dtx_file_1}" | |
348 | ||
349 | fi |