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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 ST |
122 | objtoolopt="${objtoolopt} --noinstr" |
123 | fi | |
124 | ||
125 | if [ -n "${objtoolopt}" ]; then | |
126 | if [ -z "${objtoolcmd}" ]; then | |
127 | objtoolcmd="check" | |
128 | fi | |
129 | objtoolopt="${objtoolopt} --vmlinux" | |
6804c1af PZ |
130 | if [ -z "${CONFIG_FRAME_POINTER}" ]; then |
131 | objtoolopt="${objtoolopt} --no-fp" | |
132 | fi | |
b1a1a1a0 | 133 | if [ -n "${CONFIG_GCOV_KERNEL}" ] || [ -n "${CONFIG_LTO_CLANG}" ]; then |
6804c1af PZ |
134 | objtoolopt="${objtoolopt} --no-unreachable" |
135 | fi | |
136 | if [ -n "${CONFIG_RETPOLINE}" ]; then | |
137 | objtoolopt="${objtoolopt} --retpoline" | |
138 | fi | |
139 | if [ -n "${CONFIG_X86_SMAP}" ]; then | |
140 | objtoolopt="${objtoolopt} --uaccess" | |
141 | fi | |
142 | info OBJTOOL ${1} | |
b1a1a1a0 | 143 | tools/objtool/objtool ${objtoolcmd} ${objtoolopt} ${1} |
6804c1af PZ |
144 | fi |
145 | } | |
146 | ||
1f2bfbd0 | 147 | # Link of vmlinux |
341dfcf8 | 148 | # ${1} - output file |
618916a4 | 149 | # ${2}, ${3}, ... - optional extra .o files |
1f2bfbd0 SR |
150 | vmlinux_link() |
151 | { | |
152 | local lds="${objtree}/${KBUILD_LDS}" | |
618916a4 | 153 | local output=${1} |
a5967db9 | 154 | local objects |
af73d78b | 155 | local strip_debug |
5cc12472 | 156 | local map_option |
1f2bfbd0 | 157 | |
d7b0827f LT |
158 | info LD ${output} |
159 | ||
618916a4 AN |
160 | # skip output file argument |
161 | shift | |
162 | ||
af73d78b KC |
163 | # The kallsyms linking does not need debug symbols included. |
164 | if [ "$output" != "${output#.tmp_vmlinux.kallsyms}" ] ; then | |
165 | strip_debug=-Wl,--strip-debug | |
166 | fi | |
167 | ||
5cc12472 RV |
168 | if [ -n "${CONFIG_VMLINUX_MAP}" ]; then |
169 | map_option="-Map=${output}.map" | |
170 | fi | |
171 | ||
1f2bfbd0 | 172 | if [ "${SRCARCH}" != "um" ]; then |
dc5723b0 ST |
173 | if [ -n "${CONFIG_LTO_CLANG}" ]; then |
174 | # Use vmlinux.o instead of performing the slow LTO | |
175 | # link again. | |
176 | objects="--whole-archive \ | |
177 | vmlinux.o \ | |
178 | --no-whole-archive \ | |
179 | ${@}" | |
180 | else | |
181 | objects="--whole-archive \ | |
182 | ${KBUILD_VMLINUX_OBJS} \ | |
183 | --no-whole-archive \ | |
184 | --start-group \ | |
185 | ${KBUILD_VMLINUX_LIBS} \ | |
186 | --end-group \ | |
187 | ${@}" | |
188 | fi | |
a5967db9 | 189 | |
618916a4 | 190 | ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} \ |
af73d78b | 191 | ${strip_debug#-Wl,} \ |
618916a4 | 192 | -o ${output} \ |
5cc12472 | 193 | ${map_option} \ |
a5967db9 | 194 | -T ${lds} ${objects} |
1f2bfbd0 | 195 | else |
6358d6e8 | 196 | objects="-Wl,--whole-archive \ |
d151e971 | 197 | ${KBUILD_VMLINUX_OBJS} \ |
6358d6e8 NP |
198 | -Wl,--no-whole-archive \ |
199 | -Wl,--start-group \ | |
200 | ${KBUILD_VMLINUX_LIBS} \ | |
201 | -Wl,--end-group \ | |
618916a4 | 202 | ${@}" |
a5967db9 | 203 | |
618916a4 | 204 | ${CC} ${CFLAGS_vmlinux} \ |
af73d78b | 205 | ${strip_debug} \ |
618916a4 | 206 | -o ${output} \ |
5cc12472 | 207 | ${map_option:+-Wl,${map_option}} \ |
6358d6e8 NP |
208 | -Wl,-T,${lds} \ |
209 | ${objects} \ | |
a5967db9 | 210 | -lutil -lrt -lpthread |
1f2bfbd0 SR |
211 | rm -f linux |
212 | fi | |
213 | } | |
214 | ||
e83b9f55 | 215 | # generate .BTF typeinfo from DWARF debuginfo |
341dfcf8 AN |
216 | # ${1} - vmlinux image |
217 | # ${2} - file to dump raw BTF data into | |
e83b9f55 AN |
218 | gen_btf() |
219 | { | |
341dfcf8 | 220 | local pahole_ver |
db16c1fe | 221 | local extra_paholeopt= |
e83b9f55 | 222 | |
581b31c3 | 223 | if ! [ -x "$(command -v ${PAHOLE})" ]; then |
2a67a6cc | 224 | echo >&2 "BTF: ${1}: pahole (${PAHOLE}) is not available" |
341dfcf8 | 225 | return 1 |
581b31c3 AN |
226 | fi |
227 | ||
e83b9f55 | 228 | pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/') |
21a85bd6 LB |
229 | if [ "${pahole_ver}" -lt "116" ]; then |
230 | echo >&2 "BTF: ${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.16" | |
341dfcf8 | 231 | return 1 |
e83b9f55 AN |
232 | fi |
233 | ||
341dfcf8 | 234 | vmlinux_link ${1} |
af73d78b | 235 | |
a0b8200d AN |
236 | if [ "${pahole_ver}" -ge "118" ] && [ "${pahole_ver}" -le "121" ]; then |
237 | # pahole 1.18 through 1.21 can't handle zero-sized per-CPU vars | |
238 | extra_paholeopt="${extra_paholeopt} --skip_encoding_btf_vars" | |
239 | fi | |
db16c1fe IL |
240 | if [ "${pahole_ver}" -ge "121" ]; then |
241 | extra_paholeopt="${extra_paholeopt} --btf_gen_floats" | |
242 | fi | |
243 | ||
af73d78b | 244 | info "BTF" ${2} |
ff2e6efd | 245 | LLVM_OBJCOPY="${OBJCOPY}" ${PAHOLE} -J ${extra_paholeopt} ${1} |
341dfcf8 | 246 | |
90ceddcb FS |
247 | # Create ${2} which contains just .BTF section but no symbols. Add |
248 | # SHF_ALLOC because .BTF will be part of the vmlinux image. --strip-all | |
249 | # deletes all symbols including __start_BTF and __stop_BTF, which will | |
250 | # be redefined in the linker script. Add 2>/dev/null to suppress GNU | |
251 | # objcopy warnings: "empty loadable segment detected at ..." | |
252 | ${OBJCOPY} --only-section=.BTF --set-section-flags .BTF=alloc,readonly \ | |
253 | --strip-all ${1} ${2} 2>/dev/null | |
254 | # Change e_type to ET_REL so that it can be used to link final vmlinux. | |
255 | # Unlike GNU ld, lld does not allow an ET_EXEC input. | |
256 | printf '\1' | dd of=${2} conv=notrunc bs=1 seek=16 status=none | |
e83b9f55 | 257 | } |
1f2bfbd0 | 258 | |
08beb669 | 259 | # Create ${2} .S file with all symbols from the ${1} object file |
1f2bfbd0 SR |
260 | kallsyms() |
261 | { | |
1f2bfbd0 SR |
262 | local kallsymopt; |
263 | ||
264 | if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then | |
6895f97e | 265 | kallsymopt="${kallsymopt} --all-symbols" |
1f2bfbd0 SR |
266 | fi |
267 | ||
4d5d5664 | 268 | if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then |
c6bda7c9 RR |
269 | kallsymopt="${kallsymopt} --absolute-percpu" |
270 | fi | |
271 | ||
2213e9a6 AB |
272 | if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then |
273 | kallsymopt="${kallsymopt} --base-relative" | |
274 | fi | |
275 | ||
08beb669 MY |
276 | info KSYMS ${2} |
277 | ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${2} | |
1f2bfbd0 SR |
278 | } |
279 | ||
8959e392 KC |
280 | # Perform one step in kallsyms generation, including temporary linking of |
281 | # vmlinux. | |
282 | kallsyms_step() | |
283 | { | |
284 | kallsymso_prev=${kallsymso} | |
af73d78b KC |
285 | kallsyms_vmlinux=.tmp_vmlinux.kallsyms${1} |
286 | kallsymso=${kallsyms_vmlinux}.o | |
08beb669 | 287 | kallsyms_S=${kallsyms_vmlinux}.S |
8959e392 | 288 | |
d7b0827f | 289 | vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o} |
08beb669 MY |
290 | kallsyms ${kallsyms_vmlinux} ${kallsyms_S} |
291 | ||
292 | info AS ${kallsyms_S} | |
293 | ${CC} ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS} \ | |
294 | ${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ | |
295 | -c -o ${kallsymso} ${kallsyms_S} | |
8959e392 KC |
296 | } |
297 | ||
1f2bfbd0 SR |
298 | # Create map file with all symbols from ${1} |
299 | # See mksymap for additional details | |
300 | mksysmap() | |
301 | { | |
302 | ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} | |
303 | } | |
304 | ||
10916706 | 305 | sorttable() |
1347a2ce | 306 | { |
10916706 | 307 | ${objtree}/scripts/sorttable ${1} |
1347a2ce LT |
308 | } |
309 | ||
1f2bfbd0 | 310 | # Delete output files in case of error |
1f2bfbd0 SR |
311 | cleanup() |
312 | { | |
341dfcf8 | 313 | rm -f .btf.* |
1f2bfbd0 | 314 | rm -f .tmp_System.map |
a8cccdd9 | 315 | rm -f .tmp_initcalls.lds |
38e89184 | 316 | rm -f .tmp_symversions.lds |
1f2bfbd0 SR |
317 | rm -f .tmp_vmlinux* |
318 | rm -f System.map | |
319 | rm -f vmlinux | |
5cc12472 | 320 | rm -f vmlinux.map |
1f2bfbd0 | 321 | rm -f vmlinux.o |
0b956e20 | 322 | rm -f .vmlinux.d |
1f2bfbd0 SR |
323 | } |
324 | ||
1f2bfbd0 SR |
325 | # Use "make V=1" to debug this script |
326 | case "${KBUILD_VERBOSE}" in | |
327 | *1*) | |
328 | set -x | |
329 | ;; | |
330 | esac | |
331 | ||
332 | if [ "$1" = "clean" ]; then | |
333 | cleanup | |
334 | exit 0 | |
335 | fi | |
336 | ||
337 | # We need access to CONFIG_ symbols | |
94cf8acc | 338 | . include/config/auto.conf |
1f2bfbd0 | 339 | |
1f2bfbd0 SR |
340 | # Update version |
341 | info GEN .version | |
278ae604 MY |
342 | if [ -r .version ]; then |
343 | VERSION=$(expr 0$(cat .version) + 1) | |
344 | echo $VERSION > .version | |
1f2bfbd0 | 345 | else |
278ae604 MY |
346 | rm -f .version |
347 | echo 1 > .version | |
1f2bfbd0 SR |
348 | fi; |
349 | ||
350 | # final build of init/ | |
083bc0e1 | 351 | ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1 |
1f2bfbd0 | 352 | |
abac4c89 | 353 | #link vmlinux.o |
abac4c89 | 354 | modpost_link vmlinux.o |
6804c1af | 355 | objtool_link vmlinux.o |
abac4c89 NP |
356 | |
357 | # modpost vmlinux.o to check for section mismatches | |
a721588d | 358 | ${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1 |
abac4c89 | 359 | |
898490c0 AG |
360 | info MODINFO modules.builtin.modinfo |
361 | ${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo | |
8b41fc44 MY |
362 | info GEN modules.builtin |
363 | # The second line aids cases where multiple modules share the same object. | |
364 | tr '\0' '\n' < modules.builtin.modinfo | sed -n 's/^[[:alnum:]:_]*\.file=//p' | | |
365 | tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$/.ko/' > modules.builtin | |
898490c0 | 366 | |
7fd78568 | 367 | btf_vmlinux_bin_o="" |
341dfcf8 | 368 | if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then |
af73d78b KC |
369 | btf_vmlinux_bin_o=.btf.vmlinux.bin.o |
370 | if ! gen_btf .tmp_vmlinux.btf $btf_vmlinux_bin_o ; then | |
da5fb182 SF |
371 | echo >&2 "Failed to generate BTF for vmlinux" |
372 | echo >&2 "Try to disable CONFIG_DEBUG_INFO_BTF" | |
373 | exit 1 | |
341dfcf8 AN |
374 | fi |
375 | fi | |
376 | ||
1f2bfbd0 | 377 | kallsymso="" |
8959e392 | 378 | kallsymso_prev="" |
1f2bfbd0 SR |
379 | kallsyms_vmlinux="" |
380 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
381 | ||
382 | # kallsyms support | |
383 | # Generate section listing all symbols and add it into vmlinux | |
384 | # It's a three step process: | |
385 | # 1) Link .tmp_vmlinux1 so it has all symbols and sections, | |
386 | # but __kallsyms is empty. | |
387 | # Running kallsyms on that gives us .tmp_kallsyms1.o with | |
388 | # the right size | |
389 | # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of | |
390 | # the right size, but due to the added section, some | |
391 | # addresses have shifted. | |
392 | # From here, we generate a correct .tmp_kallsyms2.o | |
7e2b37c9 NP |
393 | # 3) That link may have expanded the kernel image enough that |
394 | # more linker branch stubs / trampolines had to be added, which | |
395 | # introduces new names, which further expands kallsyms. Do another | |
396 | # pass if that is the case. In theory it's possible this results | |
397 | # in even more stubs, but unlikely. | |
398 | # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around | |
399 | # other bugs. | |
400 | # 4) The correct ${kallsymso} is linked into the final vmlinux. | |
1f2bfbd0 SR |
401 | # |
402 | # a) Verify that the System.map from vmlinux matches the map from | |
403 | # ${kallsymso}. | |
404 | ||
8959e392 KC |
405 | kallsyms_step 1 |
406 | kallsyms_step 2 | |
1f2bfbd0 | 407 | |
7e2b37c9 | 408 | # step 3 |
8959e392 KC |
409 | size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso_prev}) |
410 | size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso}) | |
7e2b37c9 NP |
411 | |
412 | if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then | |
8959e392 | 413 | kallsyms_step 3 |
1f2bfbd0 SR |
414 | fi |
415 | fi | |
416 | ||
d7b0827f | 417 | vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o} |
e83b9f55 | 418 | |
c9a0f3b8 | 419 | # fill in BTF IDs |
017dab34 JO |
420 | if [ -n "${CONFIG_DEBUG_INFO_BTF}" -a -n "${CONFIG_BPF}" ]; then |
421 | info BTFIDS vmlinux | |
422 | ${RESOLVE_BTFIDS} vmlinux | |
c9a0f3b8 JO |
423 | fi |
424 | ||
10916706 SZ |
425 | if [ -n "${CONFIG_BUILDTIME_TABLE_SORT}" ]; then |
426 | info SORTTAB vmlinux | |
f14bf6a3 SZ |
427 | if ! sorttable vmlinux; then |
428 | echo >&2 Failed to sort kernel tables | |
429 | exit 1 | |
430 | fi | |
1347a2ce LT |
431 | fi |
432 | ||
1f2bfbd0 SR |
433 | info SYSMAP System.map |
434 | mksysmap vmlinux System.map | |
435 | ||
436 | # step a (see comment above) | |
437 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
438 | mksysmap ${kallsyms_vmlinux} .tmp_System.map | |
439 | ||
440 | if ! cmp -s System.map .tmp_System.map; then | |
5369f550 | 441 | echo >&2 Inconsistent kallsyms data |
367e43c5 | 442 | echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround |
1f2bfbd0 SR |
443 | exit 1 |
444 | fi | |
445 | fi | |
0b956e20 RV |
446 | |
447 | # For fixdep | |
448 | echo "vmlinux: $0" > .vmlinux.d |