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