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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 | ||
a8cccdd9 ST |
46 | # Generate a linker script to ensure correct ordering of initcalls. |
47 | gen_initcalls() | |
48 | { | |
49 | info GEN .tmp_initcalls.lds | |
50 | ||
51 | ${PYTHON} ${srctree}/scripts/jobserver-exec \ | |
52 | ${PERL} ${srctree}/scripts/generate_initcall_order.pl \ | |
53 | ${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS} \ | |
54 | > .tmp_initcalls.lds | |
55 | } | |
56 | ||
38e89184 ST |
57 | # If CONFIG_LTO_CLANG is selected, collect generated symbol versions into |
58 | # .tmp_symversions.lds | |
59 | gen_symversions() | |
60 | { | |
61 | info GEN .tmp_symversions.lds | |
62 | rm -f .tmp_symversions.lds | |
63 | ||
64 | for o in ${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS}; do | |
65 | if [ -f ${o}.symversions ]; then | |
66 | cat ${o}.symversions >> .tmp_symversions.lds | |
67 | fi | |
68 | done | |
69 | } | |
70 | ||
1f2bfbd0 SR |
71 | # Link of vmlinux.o used for section mismatch analysis |
72 | # ${1} output file | |
73 | modpost_link() | |
74 | { | |
a5967db9 | 75 | local objects |
38e89184 | 76 | local lds="" |
a5967db9 | 77 | |
6358d6e8 | 78 | objects="--whole-archive \ |
d151e971 | 79 | ${KBUILD_VMLINUX_OBJS} \ |
6358d6e8 NP |
80 | --no-whole-archive \ |
81 | --start-group \ | |
82 | ${KBUILD_VMLINUX_LIBS} \ | |
83 | --end-group" | |
84 | ||
dc5723b0 | 85 | if [ -n "${CONFIG_LTO_CLANG}" ]; then |
a8cccdd9 ST |
86 | gen_initcalls |
87 | lds="-T .tmp_initcalls.lds" | |
88 | ||
38e89184 ST |
89 | if [ -n "${CONFIG_MODVERSIONS}" ]; then |
90 | gen_symversions | |
91 | lds="${lds} -T .tmp_symversions.lds" | |
92 | fi | |
93 | ||
dc5723b0 ST |
94 | # This might take a while, so indicate that we're doing |
95 | # an LTO link | |
96 | info LTO ${1} | |
97 | else | |
98 | info LD ${1} | |
99 | fi | |
100 | ||
38e89184 | 101 | ${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${lds} ${objects} |
1f2bfbd0 SR |
102 | } |
103 | ||
6804c1af PZ |
104 | objtool_link() |
105 | { | |
b1a1a1a0 | 106 | local objtoolcmd; |
6804c1af PZ |
107 | local objtoolopt; |
108 | ||
b1a1a1a0 ST |
109 | if [ "${CONFIG_LTO_CLANG} ${CONFIG_STACK_VALIDATION}" = "y y" ]; then |
110 | # Don't perform vmlinux validation unless explicitly requested, | |
111 | # but run objtool on vmlinux.o now that we have an object file. | |
112 | if [ -n "${CONFIG_UNWINDER_ORC}" ]; then | |
113 | objtoolcmd="orc generate" | |
114 | fi | |
115 | ||
116 | objtoolopt="${objtoolopt} --duplicate" | |
117 | ||
118 | if [ -n "${CONFIG_FTRACE_MCOUNT_USE_OBJTOOL}" ]; then | |
119 | objtoolopt="${objtoolopt} --mcount" | |
120 | fi | |
121 | fi | |
122 | ||
6804c1af | 123 | if [ -n "${CONFIG_VMLINUX_VALIDATION}" ]; then |
b1a1a1a0 ST |
124 | objtoolopt="${objtoolopt} --noinstr" |
125 | fi | |
126 | ||
127 | if [ -n "${objtoolopt}" ]; then | |
128 | if [ -z "${objtoolcmd}" ]; then | |
129 | objtoolcmd="check" | |
130 | fi | |
131 | objtoolopt="${objtoolopt} --vmlinux" | |
6804c1af PZ |
132 | if [ -z "${CONFIG_FRAME_POINTER}" ]; then |
133 | objtoolopt="${objtoolopt} --no-fp" | |
134 | fi | |
b1a1a1a0 | 135 | if [ -n "${CONFIG_GCOV_KERNEL}" ] || [ -n "${CONFIG_LTO_CLANG}" ]; then |
6804c1af PZ |
136 | objtoolopt="${objtoolopt} --no-unreachable" |
137 | fi | |
138 | if [ -n "${CONFIG_RETPOLINE}" ]; then | |
139 | objtoolopt="${objtoolopt} --retpoline" | |
140 | fi | |
141 | if [ -n "${CONFIG_X86_SMAP}" ]; then | |
142 | objtoolopt="${objtoolopt} --uaccess" | |
143 | fi | |
144 | info OBJTOOL ${1} | |
b1a1a1a0 | 145 | tools/objtool/objtool ${objtoolcmd} ${objtoolopt} ${1} |
6804c1af PZ |
146 | fi |
147 | } | |
148 | ||
1f2bfbd0 | 149 | # Link of vmlinux |
341dfcf8 | 150 | # ${1} - output file |
618916a4 | 151 | # ${2}, ${3}, ... - optional extra .o files |
1f2bfbd0 SR |
152 | vmlinux_link() |
153 | { | |
154 | local lds="${objtree}/${KBUILD_LDS}" | |
618916a4 | 155 | local output=${1} |
a5967db9 | 156 | local objects |
af73d78b | 157 | local strip_debug |
1f2bfbd0 | 158 | |
d7b0827f LT |
159 | info LD ${output} |
160 | ||
618916a4 AN |
161 | # skip output file argument |
162 | shift | |
163 | ||
af73d78b KC |
164 | # The kallsyms linking does not need debug symbols included. |
165 | if [ "$output" != "${output#.tmp_vmlinux.kallsyms}" ] ; then | |
166 | strip_debug=-Wl,--strip-debug | |
167 | fi | |
168 | ||
1f2bfbd0 | 169 | if [ "${SRCARCH}" != "um" ]; then |
dc5723b0 ST |
170 | if [ -n "${CONFIG_LTO_CLANG}" ]; then |
171 | # Use vmlinux.o instead of performing the slow LTO | |
172 | # link again. | |
173 | objects="--whole-archive \ | |
174 | vmlinux.o \ | |
175 | --no-whole-archive \ | |
176 | ${@}" | |
177 | else | |
178 | objects="--whole-archive \ | |
179 | ${KBUILD_VMLINUX_OBJS} \ | |
180 | --no-whole-archive \ | |
181 | --start-group \ | |
182 | ${KBUILD_VMLINUX_LIBS} \ | |
183 | --end-group \ | |
184 | ${@}" | |
185 | fi | |
a5967db9 | 186 | |
618916a4 | 187 | ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} \ |
af73d78b | 188 | ${strip_debug#-Wl,} \ |
618916a4 | 189 | -o ${output} \ |
a5967db9 | 190 | -T ${lds} ${objects} |
1f2bfbd0 | 191 | else |
6358d6e8 | 192 | objects="-Wl,--whole-archive \ |
d151e971 | 193 | ${KBUILD_VMLINUX_OBJS} \ |
6358d6e8 NP |
194 | -Wl,--no-whole-archive \ |
195 | -Wl,--start-group \ | |
196 | ${KBUILD_VMLINUX_LIBS} \ | |
197 | -Wl,--end-group \ | |
618916a4 | 198 | ${@}" |
a5967db9 | 199 | |
618916a4 | 200 | ${CC} ${CFLAGS_vmlinux} \ |
af73d78b | 201 | ${strip_debug} \ |
618916a4 | 202 | -o ${output} \ |
6358d6e8 NP |
203 | -Wl,-T,${lds} \ |
204 | ${objects} \ | |
a5967db9 | 205 | -lutil -lrt -lpthread |
1f2bfbd0 SR |
206 | rm -f linux |
207 | fi | |
208 | } | |
209 | ||
e83b9f55 | 210 | # generate .BTF typeinfo from DWARF debuginfo |
341dfcf8 AN |
211 | # ${1} - vmlinux image |
212 | # ${2} - file to dump raw BTF data into | |
e83b9f55 AN |
213 | gen_btf() |
214 | { | |
341dfcf8 | 215 | local pahole_ver |
e83b9f55 | 216 | |
581b31c3 | 217 | if ! [ -x "$(command -v ${PAHOLE})" ]; then |
2a67a6cc | 218 | echo >&2 "BTF: ${1}: pahole (${PAHOLE}) is not available" |
341dfcf8 | 219 | return 1 |
581b31c3 AN |
220 | fi |
221 | ||
e83b9f55 | 222 | pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/') |
21a85bd6 LB |
223 | if [ "${pahole_ver}" -lt "116" ]; then |
224 | echo >&2 "BTF: ${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.16" | |
341dfcf8 | 225 | return 1 |
e83b9f55 AN |
226 | fi |
227 | ||
341dfcf8 | 228 | vmlinux_link ${1} |
af73d78b KC |
229 | |
230 | info "BTF" ${2} | |
e83b9f55 | 231 | LLVM_OBJCOPY=${OBJCOPY} ${PAHOLE} -J ${1} |
341dfcf8 | 232 | |
90ceddcb FS |
233 | # Create ${2} which contains just .BTF section but no symbols. Add |
234 | # SHF_ALLOC because .BTF will be part of the vmlinux image. --strip-all | |
235 | # deletes all symbols including __start_BTF and __stop_BTF, which will | |
236 | # be redefined in the linker script. Add 2>/dev/null to suppress GNU | |
237 | # objcopy warnings: "empty loadable segment detected at ..." | |
238 | ${OBJCOPY} --only-section=.BTF --set-section-flags .BTF=alloc,readonly \ | |
239 | --strip-all ${1} ${2} 2>/dev/null | |
240 | # Change e_type to ET_REL so that it can be used to link final vmlinux. | |
241 | # Unlike GNU ld, lld does not allow an ET_EXEC input. | |
242 | printf '\1' | dd of=${2} conv=notrunc bs=1 seek=16 status=none | |
e83b9f55 | 243 | } |
1f2bfbd0 | 244 | |
08beb669 | 245 | # Create ${2} .S file with all symbols from the ${1} object file |
1f2bfbd0 SR |
246 | kallsyms() |
247 | { | |
1f2bfbd0 SR |
248 | local kallsymopt; |
249 | ||
250 | if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then | |
6895f97e | 251 | kallsymopt="${kallsymopt} --all-symbols" |
1f2bfbd0 SR |
252 | fi |
253 | ||
4d5d5664 | 254 | if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then |
c6bda7c9 RR |
255 | kallsymopt="${kallsymopt} --absolute-percpu" |
256 | fi | |
257 | ||
2213e9a6 AB |
258 | if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then |
259 | kallsymopt="${kallsymopt} --base-relative" | |
260 | fi | |
261 | ||
08beb669 MY |
262 | info KSYMS ${2} |
263 | ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${2} | |
1f2bfbd0 SR |
264 | } |
265 | ||
8959e392 KC |
266 | # Perform one step in kallsyms generation, including temporary linking of |
267 | # vmlinux. | |
268 | kallsyms_step() | |
269 | { | |
270 | kallsymso_prev=${kallsymso} | |
af73d78b KC |
271 | kallsyms_vmlinux=.tmp_vmlinux.kallsyms${1} |
272 | kallsymso=${kallsyms_vmlinux}.o | |
08beb669 | 273 | kallsyms_S=${kallsyms_vmlinux}.S |
8959e392 | 274 | |
d7b0827f | 275 | vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o} |
08beb669 MY |
276 | kallsyms ${kallsyms_vmlinux} ${kallsyms_S} |
277 | ||
278 | info AS ${kallsyms_S} | |
279 | ${CC} ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS} \ | |
280 | ${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ | |
281 | -c -o ${kallsymso} ${kallsyms_S} | |
8959e392 KC |
282 | } |
283 | ||
1f2bfbd0 SR |
284 | # Create map file with all symbols from ${1} |
285 | # See mksymap for additional details | |
286 | mksysmap() | |
287 | { | |
288 | ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} | |
289 | } | |
290 | ||
10916706 | 291 | sorttable() |
1347a2ce | 292 | { |
10916706 | 293 | ${objtree}/scripts/sorttable ${1} |
1347a2ce LT |
294 | } |
295 | ||
1f2bfbd0 | 296 | # Delete output files in case of error |
1f2bfbd0 SR |
297 | cleanup() |
298 | { | |
341dfcf8 | 299 | rm -f .btf.* |
1f2bfbd0 | 300 | rm -f .tmp_System.map |
a8cccdd9 | 301 | rm -f .tmp_initcalls.lds |
38e89184 | 302 | rm -f .tmp_symversions.lds |
1f2bfbd0 SR |
303 | rm -f .tmp_vmlinux* |
304 | rm -f System.map | |
305 | rm -f vmlinux | |
306 | rm -f vmlinux.o | |
307 | } | |
308 | ||
ab160dbb SB |
309 | on_exit() |
310 | { | |
311 | if [ $? -ne 0 ]; then | |
312 | cleanup | |
313 | fi | |
314 | } | |
315 | trap on_exit EXIT | |
316 | ||
317 | on_signals() | |
318 | { | |
319 | exit 1 | |
320 | } | |
321 | trap on_signals HUP INT QUIT TERM | |
322 | ||
1f2bfbd0 SR |
323 | # Use "make V=1" to debug this script |
324 | case "${KBUILD_VERBOSE}" in | |
325 | *1*) | |
326 | set -x | |
327 | ;; | |
328 | esac | |
329 | ||
330 | if [ "$1" = "clean" ]; then | |
331 | cleanup | |
332 | exit 0 | |
333 | fi | |
334 | ||
335 | # We need access to CONFIG_ symbols | |
94cf8acc | 336 | . include/config/auto.conf |
1f2bfbd0 | 337 | |
1f2bfbd0 SR |
338 | # Update version |
339 | info GEN .version | |
278ae604 MY |
340 | if [ -r .version ]; then |
341 | VERSION=$(expr 0$(cat .version) + 1) | |
342 | echo $VERSION > .version | |
1f2bfbd0 | 343 | else |
278ae604 MY |
344 | rm -f .version |
345 | echo 1 > .version | |
1f2bfbd0 SR |
346 | fi; |
347 | ||
348 | # final build of init/ | |
083bc0e1 | 349 | ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1 |
1f2bfbd0 | 350 | |
abac4c89 | 351 | #link vmlinux.o |
abac4c89 | 352 | modpost_link vmlinux.o |
6804c1af | 353 | objtool_link vmlinux.o |
abac4c89 NP |
354 | |
355 | # modpost vmlinux.o to check for section mismatches | |
a721588d | 356 | ${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1 |
abac4c89 | 357 | |
898490c0 AG |
358 | info MODINFO modules.builtin.modinfo |
359 | ${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo | |
8b41fc44 MY |
360 | info GEN modules.builtin |
361 | # The second line aids cases where multiple modules share the same object. | |
362 | tr '\0' '\n' < modules.builtin.modinfo | sed -n 's/^[[:alnum:]:_]*\.file=//p' | | |
363 | tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$/.ko/' > modules.builtin | |
898490c0 | 364 | |
7fd78568 | 365 | btf_vmlinux_bin_o="" |
341dfcf8 | 366 | if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then |
af73d78b KC |
367 | btf_vmlinux_bin_o=.btf.vmlinux.bin.o |
368 | if ! gen_btf .tmp_vmlinux.btf $btf_vmlinux_bin_o ; then | |
da5fb182 SF |
369 | echo >&2 "Failed to generate BTF for vmlinux" |
370 | echo >&2 "Try to disable CONFIG_DEBUG_INFO_BTF" | |
371 | exit 1 | |
341dfcf8 AN |
372 | fi |
373 | fi | |
374 | ||
1f2bfbd0 | 375 | kallsymso="" |
8959e392 | 376 | kallsymso_prev="" |
1f2bfbd0 SR |
377 | kallsyms_vmlinux="" |
378 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
379 | ||
380 | # kallsyms support | |
381 | # Generate section listing all symbols and add it into vmlinux | |
382 | # It's a three step process: | |
383 | # 1) Link .tmp_vmlinux1 so it has all symbols and sections, | |
384 | # but __kallsyms is empty. | |
385 | # Running kallsyms on that gives us .tmp_kallsyms1.o with | |
386 | # the right size | |
387 | # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of | |
388 | # the right size, but due to the added section, some | |
389 | # addresses have shifted. | |
390 | # From here, we generate a correct .tmp_kallsyms2.o | |
7e2b37c9 NP |
391 | # 3) That link may have expanded the kernel image enough that |
392 | # more linker branch stubs / trampolines had to be added, which | |
393 | # introduces new names, which further expands kallsyms. Do another | |
394 | # pass if that is the case. In theory it's possible this results | |
395 | # in even more stubs, but unlikely. | |
396 | # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around | |
397 | # other bugs. | |
398 | # 4) The correct ${kallsymso} is linked into the final vmlinux. | |
1f2bfbd0 SR |
399 | # |
400 | # a) Verify that the System.map from vmlinux matches the map from | |
401 | # ${kallsymso}. | |
402 | ||
8959e392 KC |
403 | kallsyms_step 1 |
404 | kallsyms_step 2 | |
1f2bfbd0 | 405 | |
7e2b37c9 | 406 | # step 3 |
8959e392 KC |
407 | size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso_prev}) |
408 | size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso}) | |
7e2b37c9 NP |
409 | |
410 | if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then | |
8959e392 | 411 | kallsyms_step 3 |
1f2bfbd0 SR |
412 | fi |
413 | fi | |
414 | ||
d7b0827f | 415 | vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o} |
e83b9f55 | 416 | |
c9a0f3b8 | 417 | # fill in BTF IDs |
017dab34 JO |
418 | if [ -n "${CONFIG_DEBUG_INFO_BTF}" -a -n "${CONFIG_BPF}" ]; then |
419 | info BTFIDS vmlinux | |
420 | ${RESOLVE_BTFIDS} vmlinux | |
c9a0f3b8 JO |
421 | fi |
422 | ||
10916706 SZ |
423 | if [ -n "${CONFIG_BUILDTIME_TABLE_SORT}" ]; then |
424 | info SORTTAB vmlinux | |
f14bf6a3 SZ |
425 | if ! sorttable vmlinux; then |
426 | echo >&2 Failed to sort kernel tables | |
427 | exit 1 | |
428 | fi | |
1347a2ce LT |
429 | fi |
430 | ||
1f2bfbd0 SR |
431 | info SYSMAP System.map |
432 | mksysmap vmlinux System.map | |
433 | ||
434 | # step a (see comment above) | |
435 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
436 | mksysmap ${kallsyms_vmlinux} .tmp_System.map | |
437 | ||
438 | if ! cmp -s System.map .tmp_System.map; then | |
5369f550 | 439 | echo >&2 Inconsistent kallsyms data |
367e43c5 | 440 | echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround |
1f2bfbd0 SR |
441 | exit 1 |
442 | fi | |
443 | fi |