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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 | # | |
d151e971 MY |
6 | # vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_OBJS) and |
7 | # $(KBUILD_VMLINUX_LIBS). Most are built-in.a files from top-level directories | |
8 | # in the kernel tree, others are specified in arch/$(ARCH)/Makefile. | |
9 | # $(KBUILD_VMLINUX_LIBS) are archives which are linked conditionally | |
10 | # (not within --whole-archive), and do not require symbol indexes added. | |
1f2bfbd0 SR |
11 | # |
12 | # vmlinux | |
13 | # ^ | |
14 | # | | |
d151e971 MY |
15 | # +--< $(KBUILD_VMLINUX_OBJS) |
16 | # | +--< init/built-in.a drivers/built-in.a mm/built-in.a + more | |
1f2bfbd0 | 17 | # | |
3a166fc2 NP |
18 | # +--< $(KBUILD_VMLINUX_LIBS) |
19 | # | +--< lib/lib.a + more | |
20 | # | | |
1f2bfbd0 SR |
21 | # +-< ${kallsymso} (see description in KALLSYMS section) |
22 | # | |
23 | # vmlinux version (uname -v) cannot be updated during normal | |
24 | # descending-into-subdirs phase since we do not yet know if we need to | |
25 | # update vmlinux. | |
26 | # Therefore this step is delayed until just before final link of vmlinux. | |
27 | # | |
28 | # System.map is generated to document addresses of all kernel symbols | |
29 | ||
30 | # Error out on error | |
31 | set -e | |
32 | ||
3ec8a5b3 MY |
33 | LD="$1" |
34 | KBUILD_LDFLAGS="$2" | |
35 | LDFLAGS_vmlinux="$3" | |
36 | ||
1f2bfbd0 SR |
37 | # Nice output in kbuild format |
38 | # Will be supressed by "make -s" | |
39 | info() | |
40 | { | |
41 | if [ "${quiet}" != "silent_" ]; then | |
e83b9f55 | 42 | printf " %-7s %s\n" "${1}" "${2}" |
1f2bfbd0 SR |
43 | fi |
44 | } | |
45 | ||
46 | # Link of vmlinux.o used for section mismatch analysis | |
47 | # ${1} output file | |
48 | modpost_link() | |
49 | { | |
a5967db9 SR |
50 | local objects |
51 | ||
6358d6e8 | 52 | objects="--whole-archive \ |
d151e971 | 53 | ${KBUILD_VMLINUX_OBJS} \ |
6358d6e8 NP |
54 | --no-whole-archive \ |
55 | --start-group \ | |
56 | ${KBUILD_VMLINUX_LIBS} \ | |
57 | --end-group" | |
58 | ||
dc5723b0 ST |
59 | if [ -n "${CONFIG_LTO_CLANG}" ]; then |
60 | # This might take a while, so indicate that we're doing | |
61 | # an LTO link | |
62 | info LTO ${1} | |
63 | else | |
64 | info LD ${1} | |
65 | fi | |
66 | ||
d503ac53 | 67 | ${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${objects} |
1f2bfbd0 SR |
68 | } |
69 | ||
6804c1af PZ |
70 | objtool_link() |
71 | { | |
72 | local objtoolopt; | |
73 | ||
74 | if [ -n "${CONFIG_VMLINUX_VALIDATION}" ]; then | |
75 | objtoolopt="check" | |
76 | if [ -z "${CONFIG_FRAME_POINTER}" ]; then | |
77 | objtoolopt="${objtoolopt} --no-fp" | |
78 | fi | |
79 | if [ -n "${CONFIG_GCOV_KERNEL}" ]; then | |
80 | objtoolopt="${objtoolopt} --no-unreachable" | |
81 | fi | |
82 | if [ -n "${CONFIG_RETPOLINE}" ]; then | |
83 | objtoolopt="${objtoolopt} --retpoline" | |
84 | fi | |
85 | if [ -n "${CONFIG_X86_SMAP}" ]; then | |
86 | objtoolopt="${objtoolopt} --uaccess" | |
87 | fi | |
88 | info OBJTOOL ${1} | |
89 | tools/objtool/objtool ${objtoolopt} ${1} | |
90 | fi | |
91 | } | |
92 | ||
1f2bfbd0 | 93 | # Link of vmlinux |
341dfcf8 | 94 | # ${1} - output file |
618916a4 | 95 | # ${2}, ${3}, ... - optional extra .o files |
1f2bfbd0 SR |
96 | vmlinux_link() |
97 | { | |
98 | local lds="${objtree}/${KBUILD_LDS}" | |
618916a4 | 99 | local output=${1} |
a5967db9 | 100 | local objects |
af73d78b | 101 | local strip_debug |
1f2bfbd0 | 102 | |
d7b0827f LT |
103 | info LD ${output} |
104 | ||
618916a4 AN |
105 | # skip output file argument |
106 | shift | |
107 | ||
af73d78b KC |
108 | # The kallsyms linking does not need debug symbols included. |
109 | if [ "$output" != "${output#.tmp_vmlinux.kallsyms}" ] ; then | |
110 | strip_debug=-Wl,--strip-debug | |
111 | fi | |
112 | ||
1f2bfbd0 | 113 | if [ "${SRCARCH}" != "um" ]; then |
dc5723b0 ST |
114 | if [ -n "${CONFIG_LTO_CLANG}" ]; then |
115 | # Use vmlinux.o instead of performing the slow LTO | |
116 | # link again. | |
117 | objects="--whole-archive \ | |
118 | vmlinux.o \ | |
119 | --no-whole-archive \ | |
120 | ${@}" | |
121 | else | |
122 | objects="--whole-archive \ | |
123 | ${KBUILD_VMLINUX_OBJS} \ | |
124 | --no-whole-archive \ | |
125 | --start-group \ | |
126 | ${KBUILD_VMLINUX_LIBS} \ | |
127 | --end-group \ | |
128 | ${@}" | |
129 | fi | |
a5967db9 | 130 | |
618916a4 | 131 | ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} \ |
af73d78b | 132 | ${strip_debug#-Wl,} \ |
618916a4 | 133 | -o ${output} \ |
a5967db9 | 134 | -T ${lds} ${objects} |
1f2bfbd0 | 135 | else |
6358d6e8 | 136 | objects="-Wl,--whole-archive \ |
d151e971 | 137 | ${KBUILD_VMLINUX_OBJS} \ |
6358d6e8 NP |
138 | -Wl,--no-whole-archive \ |
139 | -Wl,--start-group \ | |
140 | ${KBUILD_VMLINUX_LIBS} \ | |
141 | -Wl,--end-group \ | |
618916a4 | 142 | ${@}" |
a5967db9 | 143 | |
618916a4 | 144 | ${CC} ${CFLAGS_vmlinux} \ |
af73d78b | 145 | ${strip_debug} \ |
618916a4 | 146 | -o ${output} \ |
6358d6e8 NP |
147 | -Wl,-T,${lds} \ |
148 | ${objects} \ | |
a5967db9 | 149 | -lutil -lrt -lpthread |
1f2bfbd0 SR |
150 | rm -f linux |
151 | fi | |
152 | } | |
153 | ||
e83b9f55 | 154 | # generate .BTF typeinfo from DWARF debuginfo |
341dfcf8 AN |
155 | # ${1} - vmlinux image |
156 | # ${2} - file to dump raw BTF data into | |
e83b9f55 AN |
157 | gen_btf() |
158 | { | |
341dfcf8 | 159 | local pahole_ver |
e83b9f55 | 160 | |
581b31c3 | 161 | if ! [ -x "$(command -v ${PAHOLE})" ]; then |
2a67a6cc | 162 | echo >&2 "BTF: ${1}: pahole (${PAHOLE}) is not available" |
341dfcf8 | 163 | return 1 |
581b31c3 AN |
164 | fi |
165 | ||
e83b9f55 | 166 | pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/') |
21a85bd6 LB |
167 | if [ "${pahole_ver}" -lt "116" ]; then |
168 | echo >&2 "BTF: ${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.16" | |
341dfcf8 | 169 | return 1 |
e83b9f55 AN |
170 | fi |
171 | ||
341dfcf8 | 172 | vmlinux_link ${1} |
af73d78b KC |
173 | |
174 | info "BTF" ${2} | |
e83b9f55 | 175 | LLVM_OBJCOPY=${OBJCOPY} ${PAHOLE} -J ${1} |
341dfcf8 | 176 | |
90ceddcb FS |
177 | # Create ${2} which contains just .BTF section but no symbols. Add |
178 | # SHF_ALLOC because .BTF will be part of the vmlinux image. --strip-all | |
179 | # deletes all symbols including __start_BTF and __stop_BTF, which will | |
180 | # be redefined in the linker script. Add 2>/dev/null to suppress GNU | |
181 | # objcopy warnings: "empty loadable segment detected at ..." | |
182 | ${OBJCOPY} --only-section=.BTF --set-section-flags .BTF=alloc,readonly \ | |
183 | --strip-all ${1} ${2} 2>/dev/null | |
184 | # Change e_type to ET_REL so that it can be used to link final vmlinux. | |
185 | # Unlike GNU ld, lld does not allow an ET_EXEC input. | |
186 | printf '\1' | dd of=${2} conv=notrunc bs=1 seek=16 status=none | |
e83b9f55 | 187 | } |
1f2bfbd0 | 188 | |
08beb669 | 189 | # Create ${2} .S file with all symbols from the ${1} object file |
1f2bfbd0 SR |
190 | kallsyms() |
191 | { | |
1f2bfbd0 SR |
192 | local kallsymopt; |
193 | ||
194 | if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then | |
6895f97e | 195 | kallsymopt="${kallsymopt} --all-symbols" |
1f2bfbd0 SR |
196 | fi |
197 | ||
4d5d5664 | 198 | if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then |
c6bda7c9 RR |
199 | kallsymopt="${kallsymopt} --absolute-percpu" |
200 | fi | |
201 | ||
2213e9a6 AB |
202 | if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then |
203 | kallsymopt="${kallsymopt} --base-relative" | |
204 | fi | |
205 | ||
08beb669 MY |
206 | info KSYMS ${2} |
207 | ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${2} | |
1f2bfbd0 SR |
208 | } |
209 | ||
8959e392 KC |
210 | # Perform one step in kallsyms generation, including temporary linking of |
211 | # vmlinux. | |
212 | kallsyms_step() | |
213 | { | |
214 | kallsymso_prev=${kallsymso} | |
af73d78b KC |
215 | kallsyms_vmlinux=.tmp_vmlinux.kallsyms${1} |
216 | kallsymso=${kallsyms_vmlinux}.o | |
08beb669 | 217 | kallsyms_S=${kallsyms_vmlinux}.S |
8959e392 | 218 | |
d7b0827f | 219 | vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o} |
08beb669 MY |
220 | kallsyms ${kallsyms_vmlinux} ${kallsyms_S} |
221 | ||
222 | info AS ${kallsyms_S} | |
223 | ${CC} ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS} \ | |
224 | ${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ | |
225 | -c -o ${kallsymso} ${kallsyms_S} | |
8959e392 KC |
226 | } |
227 | ||
1f2bfbd0 SR |
228 | # Create map file with all symbols from ${1} |
229 | # See mksymap for additional details | |
230 | mksysmap() | |
231 | { | |
232 | ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} | |
233 | } | |
234 | ||
10916706 | 235 | sorttable() |
1347a2ce | 236 | { |
10916706 | 237 | ${objtree}/scripts/sorttable ${1} |
1347a2ce LT |
238 | } |
239 | ||
1f2bfbd0 | 240 | # Delete output files in case of error |
1f2bfbd0 SR |
241 | cleanup() |
242 | { | |
341dfcf8 | 243 | rm -f .btf.* |
1f2bfbd0 | 244 | rm -f .tmp_System.map |
1f2bfbd0 SR |
245 | rm -f .tmp_vmlinux* |
246 | rm -f System.map | |
247 | rm -f vmlinux | |
248 | rm -f vmlinux.o | |
249 | } | |
250 | ||
ab160dbb SB |
251 | on_exit() |
252 | { | |
253 | if [ $? -ne 0 ]; then | |
254 | cleanup | |
255 | fi | |
256 | } | |
257 | trap on_exit EXIT | |
258 | ||
259 | on_signals() | |
260 | { | |
261 | exit 1 | |
262 | } | |
263 | trap on_signals HUP INT QUIT TERM | |
264 | ||
1f2bfbd0 SR |
265 | # Use "make V=1" to debug this script |
266 | case "${KBUILD_VERBOSE}" in | |
267 | *1*) | |
268 | set -x | |
269 | ;; | |
270 | esac | |
271 | ||
272 | if [ "$1" = "clean" ]; then | |
273 | cleanup | |
274 | exit 0 | |
275 | fi | |
276 | ||
277 | # We need access to CONFIG_ symbols | |
94cf8acc | 278 | . include/config/auto.conf |
1f2bfbd0 | 279 | |
1f2bfbd0 SR |
280 | # Update version |
281 | info GEN .version | |
278ae604 MY |
282 | if [ -r .version ]; then |
283 | VERSION=$(expr 0$(cat .version) + 1) | |
284 | echo $VERSION > .version | |
1f2bfbd0 | 285 | else |
278ae604 MY |
286 | rm -f .version |
287 | echo 1 > .version | |
1f2bfbd0 SR |
288 | fi; |
289 | ||
290 | # final build of init/ | |
083bc0e1 | 291 | ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1 |
1f2bfbd0 | 292 | |
abac4c89 | 293 | #link vmlinux.o |
abac4c89 | 294 | modpost_link vmlinux.o |
6804c1af | 295 | objtool_link vmlinux.o |
abac4c89 NP |
296 | |
297 | # modpost vmlinux.o to check for section mismatches | |
a721588d | 298 | ${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1 |
abac4c89 | 299 | |
898490c0 AG |
300 | info MODINFO modules.builtin.modinfo |
301 | ${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo | |
8b41fc44 MY |
302 | info GEN modules.builtin |
303 | # The second line aids cases where multiple modules share the same object. | |
304 | tr '\0' '\n' < modules.builtin.modinfo | sed -n 's/^[[:alnum:]:_]*\.file=//p' | | |
305 | tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$/.ko/' > modules.builtin | |
898490c0 | 306 | |
7fd78568 | 307 | btf_vmlinux_bin_o="" |
341dfcf8 | 308 | if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then |
af73d78b KC |
309 | btf_vmlinux_bin_o=.btf.vmlinux.bin.o |
310 | if ! gen_btf .tmp_vmlinux.btf $btf_vmlinux_bin_o ; then | |
da5fb182 SF |
311 | echo >&2 "Failed to generate BTF for vmlinux" |
312 | echo >&2 "Try to disable CONFIG_DEBUG_INFO_BTF" | |
313 | exit 1 | |
341dfcf8 AN |
314 | fi |
315 | fi | |
316 | ||
1f2bfbd0 | 317 | kallsymso="" |
8959e392 | 318 | kallsymso_prev="" |
1f2bfbd0 SR |
319 | kallsyms_vmlinux="" |
320 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
321 | ||
322 | # kallsyms support | |
323 | # Generate section listing all symbols and add it into vmlinux | |
324 | # It's a three step process: | |
325 | # 1) Link .tmp_vmlinux1 so it has all symbols and sections, | |
326 | # but __kallsyms is empty. | |
327 | # Running kallsyms on that gives us .tmp_kallsyms1.o with | |
328 | # the right size | |
329 | # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of | |
330 | # the right size, but due to the added section, some | |
331 | # addresses have shifted. | |
332 | # From here, we generate a correct .tmp_kallsyms2.o | |
7e2b37c9 NP |
333 | # 3) That link may have expanded the kernel image enough that |
334 | # more linker branch stubs / trampolines had to be added, which | |
335 | # introduces new names, which further expands kallsyms. Do another | |
336 | # pass if that is the case. In theory it's possible this results | |
337 | # in even more stubs, but unlikely. | |
338 | # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around | |
339 | # other bugs. | |
340 | # 4) The correct ${kallsymso} is linked into the final vmlinux. | |
1f2bfbd0 SR |
341 | # |
342 | # a) Verify that the System.map from vmlinux matches the map from | |
343 | # ${kallsymso}. | |
344 | ||
8959e392 KC |
345 | kallsyms_step 1 |
346 | kallsyms_step 2 | |
1f2bfbd0 | 347 | |
7e2b37c9 | 348 | # step 3 |
8959e392 KC |
349 | size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso_prev}) |
350 | size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso}) | |
7e2b37c9 NP |
351 | |
352 | if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then | |
8959e392 | 353 | kallsyms_step 3 |
1f2bfbd0 SR |
354 | fi |
355 | fi | |
356 | ||
d7b0827f | 357 | vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o} |
e83b9f55 | 358 | |
c9a0f3b8 | 359 | # fill in BTF IDs |
017dab34 JO |
360 | if [ -n "${CONFIG_DEBUG_INFO_BTF}" -a -n "${CONFIG_BPF}" ]; then |
361 | info BTFIDS vmlinux | |
362 | ${RESOLVE_BTFIDS} vmlinux | |
c9a0f3b8 JO |
363 | fi |
364 | ||
10916706 SZ |
365 | if [ -n "${CONFIG_BUILDTIME_TABLE_SORT}" ]; then |
366 | info SORTTAB vmlinux | |
f14bf6a3 SZ |
367 | if ! sorttable vmlinux; then |
368 | echo >&2 Failed to sort kernel tables | |
369 | exit 1 | |
370 | fi | |
1347a2ce LT |
371 | fi |
372 | ||
1f2bfbd0 SR |
373 | info SYSMAP System.map |
374 | mksysmap vmlinux System.map | |
375 | ||
376 | # step a (see comment above) | |
377 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
378 | mksysmap ${kallsyms_vmlinux} .tmp_System.map | |
379 | ||
380 | if ! cmp -s System.map .tmp_System.map; then | |
5369f550 | 381 | echo >&2 Inconsistent kallsyms data |
367e43c5 | 382 | echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround |
1f2bfbd0 SR |
383 | exit 1 |
384 | fi | |
385 | fi |