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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="$3" | |
36 | ||
1f2bfbd0 SR |
37 | # Nice output in kbuild format |
38 | # Will be supressed by "make -s" | |
39 | info() | |
40 | { | |
c39013ee | 41 | printf " %-7s %s\n" "${1}" "${2}" |
1f2bfbd0 SR |
42 | } |
43 | ||
a8cccdd9 ST |
44 | # Generate a linker script to ensure correct ordering of initcalls. |
45 | gen_initcalls() | |
46 | { | |
47 | info GEN .tmp_initcalls.lds | |
48 | ||
49 | ${PYTHON} ${srctree}/scripts/jobserver-exec \ | |
50 | ${PERL} ${srctree}/scripts/generate_initcall_order.pl \ | |
51 | ${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS} \ | |
52 | > .tmp_initcalls.lds | |
53 | } | |
54 | ||
38e89184 ST |
55 | # If CONFIG_LTO_CLANG is selected, collect generated symbol versions into |
56 | # .tmp_symversions.lds | |
57 | gen_symversions() | |
58 | { | |
59 | info GEN .tmp_symversions.lds | |
60 | rm -f .tmp_symversions.lds | |
61 | ||
62 | for o in ${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS}; do | |
63 | if [ -f ${o}.symversions ]; then | |
64 | cat ${o}.symversions >> .tmp_symversions.lds | |
65 | fi | |
66 | done | |
67 | } | |
68 | ||
1f2bfbd0 SR |
69 | # Link of vmlinux.o used for section mismatch analysis |
70 | # ${1} output file | |
71 | modpost_link() | |
72 | { | |
a5967db9 | 73 | local objects |
38e89184 | 74 | local lds="" |
a5967db9 | 75 | |
6358d6e8 | 76 | objects="--whole-archive \ |
d151e971 | 77 | ${KBUILD_VMLINUX_OBJS} \ |
6358d6e8 NP |
78 | --no-whole-archive \ |
79 | --start-group \ | |
80 | ${KBUILD_VMLINUX_LIBS} \ | |
81 | --end-group" | |
82 | ||
dc5723b0 | 83 | if [ -n "${CONFIG_LTO_CLANG}" ]; then |
a8cccdd9 ST |
84 | gen_initcalls |
85 | lds="-T .tmp_initcalls.lds" | |
86 | ||
38e89184 ST |
87 | if [ -n "${CONFIG_MODVERSIONS}" ]; then |
88 | gen_symversions | |
89 | lds="${lds} -T .tmp_symversions.lds" | |
90 | fi | |
91 | ||
dc5723b0 ST |
92 | # This might take a while, so indicate that we're doing |
93 | # an LTO link | |
94 | info LTO ${1} | |
95 | else | |
96 | info LD ${1} | |
97 | fi | |
98 | ||
38e89184 | 99 | ${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${lds} ${objects} |
1f2bfbd0 SR |
100 | } |
101 | ||
6804c1af PZ |
102 | objtool_link() |
103 | { | |
b1a1a1a0 | 104 | local objtoolcmd; |
6804c1af PZ |
105 | local objtoolopt; |
106 | ||
b1a1a1a0 ST |
107 | if [ "${CONFIG_LTO_CLANG} ${CONFIG_STACK_VALIDATION}" = "y y" ]; then |
108 | # Don't perform vmlinux validation unless explicitly requested, | |
109 | # but run objtool on vmlinux.o now that we have an object file. | |
110 | if [ -n "${CONFIG_UNWINDER_ORC}" ]; then | |
111 | objtoolcmd="orc generate" | |
112 | fi | |
113 | ||
114 | objtoolopt="${objtoolopt} --duplicate" | |
115 | ||
116 | if [ -n "${CONFIG_FTRACE_MCOUNT_USE_OBJTOOL}" ]; then | |
117 | objtoolopt="${objtoolopt} --mcount" | |
118 | fi | |
119 | fi | |
120 | ||
6804c1af | 121 | if [ -n "${CONFIG_VMLINUX_VALIDATION}" ]; then |
b1a1a1a0 | 122 | objtoolopt="${objtoolopt} --noinstr" |
cbd355e4 | 123 | if is_enabled CONFIG_CPU_UNRET_ENTRY; then |
53b404b9 PZ |
124 | objtoolopt="${objtoolopt} --unret" |
125 | fi | |
b1a1a1a0 ST |
126 | fi |
127 | ||
128 | if [ -n "${objtoolopt}" ]; then | |
129 | if [ -z "${objtoolcmd}" ]; then | |
130 | objtoolcmd="check" | |
131 | fi | |
132 | objtoolopt="${objtoolopt} --vmlinux" | |
6804c1af PZ |
133 | if [ -z "${CONFIG_FRAME_POINTER}" ]; then |
134 | objtoolopt="${objtoolopt} --no-fp" | |
135 | fi | |
b1a1a1a0 | 136 | if [ -n "${CONFIG_GCOV_KERNEL}" ] || [ -n "${CONFIG_LTO_CLANG}" ]; then |
6804c1af PZ |
137 | objtoolopt="${objtoolopt} --no-unreachable" |
138 | fi | |
139 | if [ -n "${CONFIG_RETPOLINE}" ]; then | |
140 | objtoolopt="${objtoolopt} --retpoline" | |
141 | fi | |
142 | if [ -n "${CONFIG_X86_SMAP}" ]; then | |
143 | objtoolopt="${objtoolopt} --uaccess" | |
144 | fi | |
15f1ca1a PZ |
145 | if [ -n "${CONFIG_SLS}" ]; then |
146 | objtoolopt="${objtoolopt} --sls" | |
147 | fi | |
6804c1af | 148 | info OBJTOOL ${1} |
b1a1a1a0 | 149 | tools/objtool/objtool ${objtoolcmd} ${objtoolopt} ${1} |
6804c1af PZ |
150 | fi |
151 | } | |
152 | ||
1f2bfbd0 | 153 | # Link of vmlinux |
341dfcf8 | 154 | # ${1} - output file |
618916a4 | 155 | # ${2}, ${3}, ... - optional extra .o files |
1f2bfbd0 SR |
156 | vmlinux_link() |
157 | { | |
618916a4 | 158 | local output=${1} |
8f130512 MY |
159 | local objs |
160 | local libs | |
5df77ad6 MY |
161 | local ld |
162 | local ldflags | |
163 | local ldlibs | |
1f2bfbd0 | 164 | |
d7b0827f LT |
165 | info LD ${output} |
166 | ||
618916a4 AN |
167 | # skip output file argument |
168 | shift | |
169 | ||
8f130512 MY |
170 | if [ -n "${CONFIG_LTO_CLANG}" ]; then |
171 | # Use vmlinux.o instead of performing the slow LTO link again. | |
172 | objs=vmlinux.o | |
173 | libs= | |
174 | else | |
175 | objs="${KBUILD_VMLINUX_OBJS}" | |
176 | libs="${KBUILD_VMLINUX_LIBS}" | |
177 | fi | |
178 | ||
5df77ad6 MY |
179 | if [ "${SRCARCH}" = "um" ]; then |
180 | wl=-Wl, | |
181 | ld="${CC}" | |
182 | ldflags="${CFLAGS_vmlinux}" | |
183 | ldlibs="-lutil -lrt -lpthread" | |
184 | else | |
185 | wl= | |
186 | ld="${LD}" | |
187 | ldflags="${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux}" | |
188 | ldlibs= | |
189 | fi | |
190 | ||
191 | ldflags="${ldflags} ${wl}--script=${objtree}/${KBUILD_LDS}" | |
192 | ||
af73d78b KC |
193 | # The kallsyms linking does not need debug symbols included. |
194 | if [ "$output" != "${output#.tmp_vmlinux.kallsyms}" ] ; then | |
5df77ad6 | 195 | ldflags="${ldflags} ${wl}--strip-debug" |
af73d78b KC |
196 | fi |
197 | ||
5cc12472 | 198 | if [ -n "${CONFIG_VMLINUX_MAP}" ]; then |
5df77ad6 | 199 | ldflags="${ldflags} ${wl}-Map=${output}.map" |
5cc12472 RV |
200 | fi |
201 | ||
5df77ad6 MY |
202 | ${ld} ${ldflags} -o ${output} \ |
203 | ${wl}--whole-archive ${objs} ${wl}--no-whole-archive \ | |
204 | ${wl}--start-group ${libs} ${wl}--end-group \ | |
205 | $@ ${ldlibs} | |
1f2bfbd0 SR |
206 | } |
207 | ||
e83b9f55 | 208 | # generate .BTF typeinfo from DWARF debuginfo |
341dfcf8 AN |
209 | # ${1} - vmlinux image |
210 | # ${2} - file to dump raw BTF data into | |
e83b9f55 AN |
211 | gen_btf() |
212 | { | |
341dfcf8 | 213 | local pahole_ver |
e83b9f55 | 214 | |
581b31c3 | 215 | if ! [ -x "$(command -v ${PAHOLE})" ]; then |
2a67a6cc | 216 | echo >&2 "BTF: ${1}: pahole (${PAHOLE}) is not available" |
341dfcf8 | 217 | return 1 |
581b31c3 AN |
218 | fi |
219 | ||
e83b9f55 | 220 | pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/') |
21a85bd6 LB |
221 | if [ "${pahole_ver}" -lt "116" ]; then |
222 | echo >&2 "BTF: ${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.16" | |
341dfcf8 | 223 | return 1 |
e83b9f55 AN |
224 | fi |
225 | ||
341dfcf8 | 226 | vmlinux_link ${1} |
af73d78b KC |
227 | |
228 | info "BTF" ${2} | |
3f20d2f9 | 229 | LLVM_OBJCOPY="${OBJCOPY}" ${PAHOLE} -J ${PAHOLE_FLAGS} ${1} |
341dfcf8 | 230 | |
90ceddcb FS |
231 | # Create ${2} which contains just .BTF section but no symbols. Add |
232 | # SHF_ALLOC because .BTF will be part of the vmlinux image. --strip-all | |
233 | # deletes all symbols including __start_BTF and __stop_BTF, which will | |
234 | # be redefined in the linker script. Add 2>/dev/null to suppress GNU | |
235 | # objcopy warnings: "empty loadable segment detected at ..." | |
236 | ${OBJCOPY} --only-section=.BTF --set-section-flags .BTF=alloc,readonly \ | |
237 | --strip-all ${1} ${2} 2>/dev/null | |
238 | # Change e_type to ET_REL so that it can be used to link final vmlinux. | |
239 | # Unlike GNU ld, lld does not allow an ET_EXEC input. | |
240 | printf '\1' | dd of=${2} conv=notrunc bs=1 seek=16 status=none | |
e83b9f55 | 241 | } |
1f2bfbd0 | 242 | |
08beb669 | 243 | # Create ${2} .S file with all symbols from the ${1} object file |
1f2bfbd0 SR |
244 | kallsyms() |
245 | { | |
1f2bfbd0 SR |
246 | local kallsymopt; |
247 | ||
248 | if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then | |
6895f97e | 249 | kallsymopt="${kallsymopt} --all-symbols" |
1f2bfbd0 SR |
250 | fi |
251 | ||
4d5d5664 | 252 | if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then |
c6bda7c9 RR |
253 | kallsymopt="${kallsymopt} --absolute-percpu" |
254 | fi | |
255 | ||
2213e9a6 AB |
256 | if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then |
257 | kallsymopt="${kallsymopt} --base-relative" | |
258 | fi | |
259 | ||
08beb669 MY |
260 | info KSYMS ${2} |
261 | ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${2} | |
1f2bfbd0 SR |
262 | } |
263 | ||
8959e392 KC |
264 | # Perform one step in kallsyms generation, including temporary linking of |
265 | # vmlinux. | |
266 | kallsyms_step() | |
267 | { | |
268 | kallsymso_prev=${kallsymso} | |
af73d78b KC |
269 | kallsyms_vmlinux=.tmp_vmlinux.kallsyms${1} |
270 | kallsymso=${kallsyms_vmlinux}.o | |
08beb669 | 271 | kallsyms_S=${kallsyms_vmlinux}.S |
8959e392 | 272 | |
d7b0827f | 273 | vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o} |
08beb669 MY |
274 | kallsyms ${kallsyms_vmlinux} ${kallsyms_S} |
275 | ||
276 | info AS ${kallsyms_S} | |
277 | ${CC} ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS} \ | |
278 | ${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ | |
279 | -c -o ${kallsymso} ${kallsyms_S} | |
8959e392 KC |
280 | } |
281 | ||
1f2bfbd0 SR |
282 | # Create map file with all symbols from ${1} |
283 | # See mksymap for additional details | |
284 | mksysmap() | |
285 | { | |
286 | ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} | |
287 | } | |
288 | ||
10916706 | 289 | sorttable() |
1347a2ce | 290 | { |
10916706 | 291 | ${objtree}/scripts/sorttable ${1} |
1347a2ce LT |
292 | } |
293 | ||
1f2bfbd0 | 294 | # Delete output files in case of error |
1f2bfbd0 SR |
295 | cleanup() |
296 | { | |
341dfcf8 | 297 | rm -f .btf.* |
1f2bfbd0 | 298 | rm -f .tmp_System.map |
a8cccdd9 | 299 | rm -f .tmp_initcalls.lds |
38e89184 | 300 | rm -f .tmp_symversions.lds |
1f2bfbd0 SR |
301 | rm -f .tmp_vmlinux* |
302 | rm -f System.map | |
303 | rm -f vmlinux | |
5cc12472 | 304 | rm -f vmlinux.map |
1f2bfbd0 | 305 | rm -f vmlinux.o |
0b956e20 | 306 | rm -f .vmlinux.d |
1f2bfbd0 SR |
307 | } |
308 | ||
1f2bfbd0 SR |
309 | # Use "make V=1" to debug this script |
310 | case "${KBUILD_VERBOSE}" in | |
311 | *1*) | |
312 | set -x | |
313 | ;; | |
314 | esac | |
315 | ||
316 | if [ "$1" = "clean" ]; then | |
317 | cleanup | |
318 | exit 0 | |
319 | fi | |
320 | ||
321 | # We need access to CONFIG_ symbols | |
94cf8acc | 322 | . include/config/auto.conf |
1f2bfbd0 | 323 | |
1f2bfbd0 SR |
324 | # Update version |
325 | info GEN .version | |
278ae604 MY |
326 | if [ -r .version ]; then |
327 | VERSION=$(expr 0$(cat .version) + 1) | |
328 | echo $VERSION > .version | |
1f2bfbd0 | 329 | else |
278ae604 MY |
330 | rm -f .version |
331 | echo 1 > .version | |
1f2bfbd0 SR |
332 | fi; |
333 | ||
334 | # final build of init/ | |
083bc0e1 | 335 | ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1 |
1f2bfbd0 | 336 | |
abac4c89 | 337 | #link vmlinux.o |
abac4c89 | 338 | modpost_link vmlinux.o |
6804c1af | 339 | objtool_link vmlinux.o |
abac4c89 NP |
340 | |
341 | # modpost vmlinux.o to check for section mismatches | |
a721588d | 342 | ${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1 |
abac4c89 | 343 | |
898490c0 AG |
344 | info MODINFO modules.builtin.modinfo |
345 | ${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo | |
8b41fc44 MY |
346 | info GEN modules.builtin |
347 | # The second line aids cases where multiple modules share the same object. | |
348 | tr '\0' '\n' < modules.builtin.modinfo | sed -n 's/^[[:alnum:]:_]*\.file=//p' | | |
349 | tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$/.ko/' > modules.builtin | |
898490c0 | 350 | |
7fd78568 | 351 | btf_vmlinux_bin_o="" |
341dfcf8 | 352 | if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then |
af73d78b KC |
353 | btf_vmlinux_bin_o=.btf.vmlinux.bin.o |
354 | if ! gen_btf .tmp_vmlinux.btf $btf_vmlinux_bin_o ; then | |
da5fb182 SF |
355 | echo >&2 "Failed to generate BTF for vmlinux" |
356 | echo >&2 "Try to disable CONFIG_DEBUG_INFO_BTF" | |
357 | exit 1 | |
341dfcf8 AN |
358 | fi |
359 | fi | |
360 | ||
1f2bfbd0 | 361 | kallsymso="" |
8959e392 | 362 | kallsymso_prev="" |
1f2bfbd0 SR |
363 | kallsyms_vmlinux="" |
364 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
365 | ||
366 | # kallsyms support | |
367 | # Generate section listing all symbols and add it into vmlinux | |
368 | # It's a three step process: | |
369 | # 1) Link .tmp_vmlinux1 so it has all symbols and sections, | |
370 | # but __kallsyms is empty. | |
371 | # Running kallsyms on that gives us .tmp_kallsyms1.o with | |
372 | # the right size | |
373 | # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of | |
374 | # the right size, but due to the added section, some | |
375 | # addresses have shifted. | |
376 | # From here, we generate a correct .tmp_kallsyms2.o | |
7e2b37c9 NP |
377 | # 3) That link may have expanded the kernel image enough that |
378 | # more linker branch stubs / trampolines had to be added, which | |
379 | # introduces new names, which further expands kallsyms. Do another | |
380 | # pass if that is the case. In theory it's possible this results | |
381 | # in even more stubs, but unlikely. | |
382 | # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around | |
383 | # other bugs. | |
384 | # 4) The correct ${kallsymso} is linked into the final vmlinux. | |
1f2bfbd0 SR |
385 | # |
386 | # a) Verify that the System.map from vmlinux matches the map from | |
387 | # ${kallsymso}. | |
388 | ||
8959e392 KC |
389 | kallsyms_step 1 |
390 | kallsyms_step 2 | |
1f2bfbd0 | 391 | |
7e2b37c9 | 392 | # step 3 |
8959e392 KC |
393 | size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso_prev}) |
394 | size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso}) | |
7e2b37c9 NP |
395 | |
396 | if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then | |
8959e392 | 397 | kallsyms_step 3 |
1f2bfbd0 SR |
398 | fi |
399 | fi | |
400 | ||
d7b0827f | 401 | vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o} |
e83b9f55 | 402 | |
c9a0f3b8 | 403 | # fill in BTF IDs |
017dab34 JO |
404 | if [ -n "${CONFIG_DEBUG_INFO_BTF}" -a -n "${CONFIG_BPF}" ]; then |
405 | info BTFIDS vmlinux | |
406 | ${RESOLVE_BTFIDS} vmlinux | |
c9a0f3b8 JO |
407 | fi |
408 | ||
10916706 SZ |
409 | if [ -n "${CONFIG_BUILDTIME_TABLE_SORT}" ]; then |
410 | info SORTTAB vmlinux | |
f14bf6a3 SZ |
411 | if ! sorttable vmlinux; then |
412 | echo >&2 Failed to sort kernel tables | |
413 | exit 1 | |
414 | fi | |
1347a2ce LT |
415 | fi |
416 | ||
1f2bfbd0 SR |
417 | info SYSMAP System.map |
418 | mksysmap vmlinux System.map | |
419 | ||
420 | # step a (see comment above) | |
421 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
422 | mksysmap ${kallsyms_vmlinux} .tmp_System.map | |
423 | ||
424 | if ! cmp -s System.map .tmp_System.map; then | |
5369f550 | 425 | echo >&2 Inconsistent kallsyms data |
367e43c5 | 426 | echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround |
1f2bfbd0 SR |
427 | exit 1 |
428 | fi | |
429 | fi | |
0b956e20 RV |
430 | |
431 | # For fixdep | |
432 | echo "vmlinux: $0" > .vmlinux.d |