Commit | Line | Data |
---|---|---|
1f2bfbd0 | 1 | #!/bin/sh |
b2441318 | 2 | # SPDX-License-Identifier: GPL-2.0 |
1f2bfbd0 SR |
3 | # |
4 | # link vmlinux | |
5 | # | |
6 | # vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_INIT) and | |
3a166fc2 NP |
7 | # $(KBUILD_VMLINUX_MAIN) and $(KBUILD_VMLINUX_LIBS). Most are built-in.o files |
8 | # from top-level directories in the kernel tree, others are specified in | |
9 | # arch/$(ARCH)/Makefile. Ordering when linking is important, and | |
10 | # $(KBUILD_VMLINUX_INIT) must be first. $(KBUILD_VMLINUX_LIBS) are archives | |
11 | # which are linked conditionally (not within --whole-archive), and do not | |
12 | # require symbol indexes added. | |
1f2bfbd0 SR |
13 | # |
14 | # vmlinux | |
15 | # ^ | |
16 | # | | |
17 | # +-< $(KBUILD_VMLINUX_INIT) | |
18 | # | +--< init/version.o + more | |
19 | # | | |
20 | # +--< $(KBUILD_VMLINUX_MAIN) | |
21 | # | +--< drivers/built-in.o mm/built-in.o + more | |
22 | # | | |
3a166fc2 NP |
23 | # +--< $(KBUILD_VMLINUX_LIBS) |
24 | # | +--< lib/lib.a + more | |
25 | # | | |
1f2bfbd0 SR |
26 | # +-< ${kallsymso} (see description in KALLSYMS section) |
27 | # | |
28 | # vmlinux version (uname -v) cannot be updated during normal | |
29 | # descending-into-subdirs phase since we do not yet know if we need to | |
30 | # update vmlinux. | |
31 | # Therefore this step is delayed until just before final link of vmlinux. | |
32 | # | |
33 | # System.map is generated to document addresses of all kernel symbols | |
34 | ||
35 | # Error out on error | |
36 | set -e | |
37 | ||
38 | # Nice output in kbuild format | |
39 | # Will be supressed by "make -s" | |
40 | info() | |
41 | { | |
42 | if [ "${quiet}" != "silent_" ]; then | |
43 | printf " %-7s %s\n" ${1} ${2} | |
44 | fi | |
45 | } | |
46 | ||
3a166fc2 NP |
47 | # Thin archive build here makes a final archive with symbol table and indexes |
48 | # from vmlinux objects INIT and MAIN, which can be used as input to linker. | |
49 | # KBUILD_VMLINUX_LIBS archives should already have symbol table and indexes | |
50 | # added. | |
a5967db9 SR |
51 | # |
52 | # Traditional incremental style of link does not require this step | |
53 | # | |
54 | # built-in.o output file | |
55 | # | |
56 | archive_builtin() | |
57 | { | |
58 | if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then | |
59 | info AR built-in.o | |
60 | rm -f built-in.o; | |
9a6cfca4 | 61 | ${AR} rcsTP${KBUILD_ARFLAGS} built-in.o \ |
a5967db9 SR |
62 | ${KBUILD_VMLINUX_INIT} \ |
63 | ${KBUILD_VMLINUX_MAIN} | |
64 | fi | |
65 | } | |
66 | ||
1f2bfbd0 SR |
67 | # Link of vmlinux.o used for section mismatch analysis |
68 | # ${1} output file | |
69 | modpost_link() | |
70 | { | |
a5967db9 SR |
71 | local objects |
72 | ||
73 | if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then | |
3a166fc2 NP |
74 | objects="--whole-archive \ |
75 | built-in.o \ | |
76 | --no-whole-archive \ | |
77 | --start-group \ | |
78 | ${KBUILD_VMLINUX_LIBS} \ | |
79 | --end-group" | |
a5967db9 SR |
80 | else |
81 | objects="${KBUILD_VMLINUX_INIT} \ | |
82 | --start-group \ | |
83 | ${KBUILD_VMLINUX_MAIN} \ | |
3a166fc2 | 84 | ${KBUILD_VMLINUX_LIBS} \ |
a5967db9 SR |
85 | --end-group" |
86 | fi | |
87 | ${LD} ${LDFLAGS} -r -o ${1} ${objects} | |
1f2bfbd0 SR |
88 | } |
89 | ||
90 | # Link of vmlinux | |
91 | # ${1} - optional extra .o files | |
92 | # ${2} - output file | |
93 | vmlinux_link() | |
94 | { | |
95 | local lds="${objtree}/${KBUILD_LDS}" | |
a5967db9 | 96 | local objects |
1f2bfbd0 SR |
97 | |
98 | if [ "${SRCARCH}" != "um" ]; then | |
a5967db9 | 99 | if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then |
3a166fc2 NP |
100 | objects="--whole-archive \ |
101 | built-in.o \ | |
102 | --no-whole-archive \ | |
103 | --start-group \ | |
104 | ${KBUILD_VMLINUX_LIBS} \ | |
105 | --end-group \ | |
106 | ${1}" | |
a5967db9 SR |
107 | else |
108 | objects="${KBUILD_VMLINUX_INIT} \ | |
109 | --start-group \ | |
110 | ${KBUILD_VMLINUX_MAIN} \ | |
3a166fc2 | 111 | ${KBUILD_VMLINUX_LIBS} \ |
a5967db9 SR |
112 | --end-group \ |
113 | ${1}" | |
114 | fi | |
115 | ||
116 | ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} \ | |
117 | -T ${lds} ${objects} | |
1f2bfbd0 | 118 | else |
a5967db9 | 119 | if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then |
3a166fc2 NP |
120 | objects="-Wl,--whole-archive \ |
121 | built-in.o \ | |
122 | -Wl,--no-whole-archive \ | |
123 | -Wl,--start-group \ | |
124 | ${KBUILD_VMLINUX_LIBS} \ | |
125 | -Wl,--end-group \ | |
126 | ${1}" | |
a5967db9 SR |
127 | else |
128 | objects="${KBUILD_VMLINUX_INIT} \ | |
129 | -Wl,--start-group \ | |
130 | ${KBUILD_VMLINUX_MAIN} \ | |
3a166fc2 | 131 | ${KBUILD_VMLINUX_LIBS} \ |
a5967db9 SR |
132 | -Wl,--end-group \ |
133 | ${1}" | |
134 | fi | |
135 | ||
136 | ${CC} ${CFLAGS_vmlinux} -o ${2} \ | |
137 | -Wl,-T,${lds} \ | |
138 | ${objects} \ | |
139 | -lutil -lrt -lpthread | |
1f2bfbd0 SR |
140 | rm -f linux |
141 | fi | |
142 | } | |
143 | ||
144 | ||
145 | # Create ${2} .o file with all symbols from the ${1} object file | |
146 | kallsyms() | |
147 | { | |
148 | info KSYM ${2} | |
149 | local kallsymopt; | |
150 | ||
b92021b0 RR |
151 | if [ -n "${CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX}" ]; then |
152 | kallsymopt="${kallsymopt} --symbol-prefix=_" | |
6895f97e JH |
153 | fi |
154 | ||
1f2bfbd0 | 155 | if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then |
6895f97e | 156 | kallsymopt="${kallsymopt} --all-symbols" |
1f2bfbd0 SR |
157 | fi |
158 | ||
4d5d5664 | 159 | if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then |
c6bda7c9 RR |
160 | kallsymopt="${kallsymopt} --absolute-percpu" |
161 | fi | |
162 | ||
2213e9a6 AB |
163 | if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then |
164 | kallsymopt="${kallsymopt} --base-relative" | |
165 | fi | |
166 | ||
00e6c28c SR |
167 | local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ |
168 | ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}" | |
1f2bfbd0 | 169 | |
a0439342 AB |
170 | local afile="`basename ${2} .o`.S" |
171 | ||
172 | ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile} | |
173 | ${CC} ${aflags} -c -o ${2} ${afile} | |
1f2bfbd0 SR |
174 | } |
175 | ||
176 | # Create map file with all symbols from ${1} | |
177 | # See mksymap for additional details | |
178 | mksysmap() | |
179 | { | |
180 | ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} | |
181 | } | |
182 | ||
1347a2ce LT |
183 | sortextable() |
184 | { | |
185 | ${objtree}/scripts/sortextable ${1} | |
186 | } | |
187 | ||
1f2bfbd0 | 188 | # Delete output files in case of error |
1f2bfbd0 SR |
189 | cleanup() |
190 | { | |
1f2bfbd0 SR |
191 | rm -f .tmp_System.map |
192 | rm -f .tmp_kallsyms* | |
1f2bfbd0 | 193 | rm -f .tmp_vmlinux* |
a5967db9 | 194 | rm -f built-in.o |
1f2bfbd0 SR |
195 | rm -f System.map |
196 | rm -f vmlinux | |
197 | rm -f vmlinux.o | |
198 | } | |
199 | ||
ab160dbb SB |
200 | on_exit() |
201 | { | |
202 | if [ $? -ne 0 ]; then | |
203 | cleanup | |
204 | fi | |
205 | } | |
206 | trap on_exit EXIT | |
207 | ||
208 | on_signals() | |
209 | { | |
210 | exit 1 | |
211 | } | |
212 | trap on_signals HUP INT QUIT TERM | |
213 | ||
1f2bfbd0 SR |
214 | # |
215 | # | |
216 | # Use "make V=1" to debug this script | |
217 | case "${KBUILD_VERBOSE}" in | |
218 | *1*) | |
219 | set -x | |
220 | ;; | |
221 | esac | |
222 | ||
223 | if [ "$1" = "clean" ]; then | |
224 | cleanup | |
225 | exit 0 | |
226 | fi | |
227 | ||
228 | # We need access to CONFIG_ symbols | |
423a8155 MM |
229 | case "${KCONFIG_CONFIG}" in |
230 | */*) | |
231 | . "${KCONFIG_CONFIG}" | |
232 | ;; | |
233 | *) | |
234 | # Force using a file from the current directory | |
235 | . "./${KCONFIG_CONFIG}" | |
236 | esac | |
1f2bfbd0 | 237 | |
1f2bfbd0 SR |
238 | # Update version |
239 | info GEN .version | |
278ae604 MY |
240 | if [ -r .version ]; then |
241 | VERSION=$(expr 0$(cat .version) + 1) | |
242 | echo $VERSION > .version | |
1f2bfbd0 | 243 | else |
278ae604 MY |
244 | rm -f .version |
245 | echo 1 > .version | |
1f2bfbd0 SR |
246 | fi; |
247 | ||
248 | # final build of init/ | |
6b90bd4b | 249 | ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init GCC_PLUGINS_CFLAGS="${GCC_PLUGINS_CFLAGS}" |
1f2bfbd0 | 250 | |
abac4c89 NP |
251 | archive_builtin |
252 | ||
253 | #link vmlinux.o | |
254 | info LD vmlinux.o | |
255 | modpost_link vmlinux.o | |
256 | ||
257 | # modpost vmlinux.o to check for section mismatches | |
258 | ${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o | |
259 | ||
1f2bfbd0 SR |
260 | kallsymso="" |
261 | kallsyms_vmlinux="" | |
262 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
263 | ||
264 | # kallsyms support | |
265 | # Generate section listing all symbols and add it into vmlinux | |
266 | # It's a three step process: | |
267 | # 1) Link .tmp_vmlinux1 so it has all symbols and sections, | |
268 | # but __kallsyms is empty. | |
269 | # Running kallsyms on that gives us .tmp_kallsyms1.o with | |
270 | # the right size | |
271 | # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of | |
272 | # the right size, but due to the added section, some | |
273 | # addresses have shifted. | |
274 | # From here, we generate a correct .tmp_kallsyms2.o | |
7e2b37c9 NP |
275 | # 3) That link may have expanded the kernel image enough that |
276 | # more linker branch stubs / trampolines had to be added, which | |
277 | # introduces new names, which further expands kallsyms. Do another | |
278 | # pass if that is the case. In theory it's possible this results | |
279 | # in even more stubs, but unlikely. | |
280 | # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around | |
281 | # other bugs. | |
282 | # 4) The correct ${kallsymso} is linked into the final vmlinux. | |
1f2bfbd0 SR |
283 | # |
284 | # a) Verify that the System.map from vmlinux matches the map from | |
285 | # ${kallsymso}. | |
286 | ||
287 | kallsymso=.tmp_kallsyms2.o | |
288 | kallsyms_vmlinux=.tmp_vmlinux2 | |
289 | ||
290 | # step 1 | |
291 | vmlinux_link "" .tmp_vmlinux1 | |
292 | kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o | |
293 | ||
294 | # step 2 | |
295 | vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2 | |
296 | kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o | |
297 | ||
7e2b37c9 NP |
298 | # step 3 |
299 | size1=$(stat -c "%s" .tmp_kallsyms1.o) | |
300 | size2=$(stat -c "%s" .tmp_kallsyms2.o) | |
301 | ||
302 | if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then | |
1f2bfbd0 SR |
303 | kallsymso=.tmp_kallsyms3.o |
304 | kallsyms_vmlinux=.tmp_vmlinux3 | |
305 | ||
306 | vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3 | |
307 | ||
308 | kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o | |
309 | fi | |
310 | fi | |
311 | ||
312 | info LD vmlinux | |
313 | vmlinux_link "${kallsymso}" vmlinux | |
314 | ||
1347a2ce LT |
315 | if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then |
316 | info SORTEX vmlinux | |
317 | sortextable vmlinux | |
318 | fi | |
319 | ||
1f2bfbd0 SR |
320 | info SYSMAP System.map |
321 | mksysmap vmlinux System.map | |
322 | ||
323 | # step a (see comment above) | |
324 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
325 | mksysmap ${kallsyms_vmlinux} .tmp_System.map | |
326 | ||
327 | if ! cmp -s System.map .tmp_System.map; then | |
5369f550 | 328 | echo >&2 Inconsistent kallsyms data |
367e43c5 | 329 | echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround |
1f2bfbd0 SR |
330 | exit 1 |
331 | fi | |
332 | fi |