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Commit | Line | Data |
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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 | |
f49821ee | 7 | # $(KBUILD_VMLINUX_MAIN) and $(KBUILD_VMLINUX_LIBS). Most are built-in.a files |
3a166fc2 NP |
8 | # from top-level directories in the kernel tree, others are specified in |
9 | # arch/$(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) | |
f49821ee | 21 | # | +--< drivers/built-in.a mm/built-in.a + more |
1f2bfbd0 | 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 | # | |
f49821ee | 54 | # built-in.a output file |
a5967db9 SR |
55 | # |
56 | archive_builtin() | |
57 | { | |
f49821ee NP |
58 | info AR built-in.a |
59 | rm -f built-in.a; | |
60 | ${AR} rcsTP${KBUILD_ARFLAGS} built-in.a \ | |
6358d6e8 NP |
61 | ${KBUILD_VMLINUX_INIT} \ |
62 | ${KBUILD_VMLINUX_MAIN} | |
a5967db9 SR |
63 | } |
64 | ||
1f2bfbd0 SR |
65 | # Link of vmlinux.o used for section mismatch analysis |
66 | # ${1} output file | |
67 | modpost_link() | |
68 | { | |
a5967db9 SR |
69 | local objects |
70 | ||
6358d6e8 | 71 | objects="--whole-archive \ |
f49821ee | 72 | built-in.a \ |
6358d6e8 NP |
73 | --no-whole-archive \ |
74 | --start-group \ | |
75 | ${KBUILD_VMLINUX_LIBS} \ | |
76 | --end-group" | |
77 | ||
a5967db9 | 78 | ${LD} ${LDFLAGS} -r -o ${1} ${objects} |
1f2bfbd0 SR |
79 | } |
80 | ||
81 | # Link of vmlinux | |
82 | # ${1} - optional extra .o files | |
83 | # ${2} - output file | |
84 | vmlinux_link() | |
85 | { | |
86 | local lds="${objtree}/${KBUILD_LDS}" | |
a5967db9 | 87 | local objects |
1f2bfbd0 SR |
88 | |
89 | if [ "${SRCARCH}" != "um" ]; then | |
6358d6e8 | 90 | objects="--whole-archive \ |
f49821ee | 91 | built-in.a \ |
6358d6e8 NP |
92 | --no-whole-archive \ |
93 | --start-group \ | |
94 | ${KBUILD_VMLINUX_LIBS} \ | |
95 | --end-group \ | |
96 | ${1}" | |
a5967db9 | 97 | |
6358d6e8 | 98 | ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} \ |
a5967db9 | 99 | -T ${lds} ${objects} |
1f2bfbd0 | 100 | else |
6358d6e8 | 101 | objects="-Wl,--whole-archive \ |
f49821ee | 102 | built-in.a \ |
6358d6e8 NP |
103 | -Wl,--no-whole-archive \ |
104 | -Wl,--start-group \ | |
105 | ${KBUILD_VMLINUX_LIBS} \ | |
106 | -Wl,--end-group \ | |
107 | ${1}" | |
a5967db9 | 108 | |
6358d6e8 NP |
109 | ${CC} ${CFLAGS_vmlinux} -o ${2} \ |
110 | -Wl,-T,${lds} \ | |
111 | ${objects} \ | |
a5967db9 | 112 | -lutil -lrt -lpthread |
1f2bfbd0 SR |
113 | rm -f linux |
114 | fi | |
115 | } | |
116 | ||
117 | ||
118 | # Create ${2} .o file with all symbols from the ${1} object file | |
119 | kallsyms() | |
120 | { | |
121 | info KSYM ${2} | |
122 | local kallsymopt; | |
123 | ||
124 | if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then | |
6895f97e | 125 | kallsymopt="${kallsymopt} --all-symbols" |
1f2bfbd0 SR |
126 | fi |
127 | ||
4d5d5664 | 128 | if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then |
c6bda7c9 RR |
129 | kallsymopt="${kallsymopt} --absolute-percpu" |
130 | fi | |
131 | ||
2213e9a6 AB |
132 | if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then |
133 | kallsymopt="${kallsymopt} --base-relative" | |
134 | fi | |
135 | ||
00e6c28c SR |
136 | local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ |
137 | ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}" | |
1f2bfbd0 | 138 | |
a0439342 AB |
139 | local afile="`basename ${2} .o`.S" |
140 | ||
141 | ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile} | |
142 | ${CC} ${aflags} -c -o ${2} ${afile} | |
1f2bfbd0 SR |
143 | } |
144 | ||
145 | # Create map file with all symbols from ${1} | |
146 | # See mksymap for additional details | |
147 | mksysmap() | |
148 | { | |
149 | ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} | |
150 | } | |
151 | ||
1347a2ce LT |
152 | sortextable() |
153 | { | |
154 | ${objtree}/scripts/sortextable ${1} | |
155 | } | |
156 | ||
1f2bfbd0 | 157 | # Delete output files in case of error |
1f2bfbd0 SR |
158 | cleanup() |
159 | { | |
1f2bfbd0 SR |
160 | rm -f .tmp_System.map |
161 | rm -f .tmp_kallsyms* | |
1f2bfbd0 | 162 | rm -f .tmp_vmlinux* |
f49821ee | 163 | rm -f built-in.a |
1f2bfbd0 SR |
164 | rm -f System.map |
165 | rm -f vmlinux | |
166 | rm -f vmlinux.o | |
167 | } | |
168 | ||
ab160dbb SB |
169 | on_exit() |
170 | { | |
171 | if [ $? -ne 0 ]; then | |
172 | cleanup | |
173 | fi | |
174 | } | |
175 | trap on_exit EXIT | |
176 | ||
177 | on_signals() | |
178 | { | |
179 | exit 1 | |
180 | } | |
181 | trap on_signals HUP INT QUIT TERM | |
182 | ||
1f2bfbd0 SR |
183 | # |
184 | # | |
185 | # Use "make V=1" to debug this script | |
186 | case "${KBUILD_VERBOSE}" in | |
187 | *1*) | |
188 | set -x | |
189 | ;; | |
190 | esac | |
191 | ||
192 | if [ "$1" = "clean" ]; then | |
193 | cleanup | |
194 | exit 0 | |
195 | fi | |
196 | ||
197 | # We need access to CONFIG_ symbols | |
423a8155 MM |
198 | case "${KCONFIG_CONFIG}" in |
199 | */*) | |
200 | . "${KCONFIG_CONFIG}" | |
201 | ;; | |
202 | *) | |
203 | # Force using a file from the current directory | |
204 | . "./${KCONFIG_CONFIG}" | |
205 | esac | |
1f2bfbd0 | 206 | |
1f2bfbd0 SR |
207 | # Update version |
208 | info GEN .version | |
278ae604 MY |
209 | if [ -r .version ]; then |
210 | VERSION=$(expr 0$(cat .version) + 1) | |
211 | echo $VERSION > .version | |
1f2bfbd0 | 212 | else |
278ae604 MY |
213 | rm -f .version |
214 | echo 1 > .version | |
1f2bfbd0 SR |
215 | fi; |
216 | ||
217 | # final build of init/ | |
a7b151ff | 218 | ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init |
1f2bfbd0 | 219 | |
abac4c89 NP |
220 | archive_builtin |
221 | ||
222 | #link vmlinux.o | |
223 | info LD vmlinux.o | |
224 | modpost_link vmlinux.o | |
225 | ||
226 | # modpost vmlinux.o to check for section mismatches | |
227 | ${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o | |
228 | ||
1f2bfbd0 SR |
229 | kallsymso="" |
230 | kallsyms_vmlinux="" | |
231 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
232 | ||
233 | # kallsyms support | |
234 | # Generate section listing all symbols and add it into vmlinux | |
235 | # It's a three step process: | |
236 | # 1) Link .tmp_vmlinux1 so it has all symbols and sections, | |
237 | # but __kallsyms is empty. | |
238 | # Running kallsyms on that gives us .tmp_kallsyms1.o with | |
239 | # the right size | |
240 | # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of | |
241 | # the right size, but due to the added section, some | |
242 | # addresses have shifted. | |
243 | # From here, we generate a correct .tmp_kallsyms2.o | |
7e2b37c9 NP |
244 | # 3) That link may have expanded the kernel image enough that |
245 | # more linker branch stubs / trampolines had to be added, which | |
246 | # introduces new names, which further expands kallsyms. Do another | |
247 | # pass if that is the case. In theory it's possible this results | |
248 | # in even more stubs, but unlikely. | |
249 | # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around | |
250 | # other bugs. | |
251 | # 4) The correct ${kallsymso} is linked into the final vmlinux. | |
1f2bfbd0 SR |
252 | # |
253 | # a) Verify that the System.map from vmlinux matches the map from | |
254 | # ${kallsymso}. | |
255 | ||
256 | kallsymso=.tmp_kallsyms2.o | |
257 | kallsyms_vmlinux=.tmp_vmlinux2 | |
258 | ||
259 | # step 1 | |
260 | vmlinux_link "" .tmp_vmlinux1 | |
261 | kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o | |
262 | ||
263 | # step 2 | |
264 | vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2 | |
265 | kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o | |
266 | ||
7e2b37c9 | 267 | # step 3 |
a670b0b4 MF |
268 | size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms1.o) |
269 | size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms2.o) | |
7e2b37c9 NP |
270 | |
271 | if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then | |
1f2bfbd0 SR |
272 | kallsymso=.tmp_kallsyms3.o |
273 | kallsyms_vmlinux=.tmp_vmlinux3 | |
274 | ||
275 | vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3 | |
276 | ||
277 | kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o | |
278 | fi | |
279 | fi | |
280 | ||
281 | info LD vmlinux | |
282 | vmlinux_link "${kallsymso}" vmlinux | |
283 | ||
1347a2ce LT |
284 | if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then |
285 | info SORTEX vmlinux | |
286 | sortextable vmlinux | |
287 | fi | |
288 | ||
1f2bfbd0 SR |
289 | info SYSMAP System.map |
290 | mksysmap vmlinux System.map | |
291 | ||
292 | # step a (see comment above) | |
293 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
294 | mksysmap ${kallsyms_vmlinux} .tmp_System.map | |
295 | ||
296 | if ! cmp -s System.map .tmp_System.map; then | |
5369f550 | 297 | echo >&2 Inconsistent kallsyms data |
367e43c5 | 298 | echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround |
1f2bfbd0 SR |
299 | exit 1 |
300 | fi | |
301 | fi |