Commit | Line | Data |
---|---|---|
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 | ||
7d153696 MY |
37 | is_enabled() { |
38 | grep -q "^$1=y" include/config/auto.conf | |
39 | } | |
40 | ||
1f2bfbd0 SR |
41 | # Nice output in kbuild format |
42 | # Will be supressed by "make -s" | |
43 | info() | |
44 | { | |
c39013ee | 45 | printf " %-7s %s\n" "${1}" "${2}" |
1f2bfbd0 SR |
46 | } |
47 | ||
a8cccdd9 ST |
48 | # Generate a linker script to ensure correct ordering of initcalls. |
49 | gen_initcalls() | |
50 | { | |
51 | info GEN .tmp_initcalls.lds | |
52 | ||
53 | ${PYTHON} ${srctree}/scripts/jobserver-exec \ | |
54 | ${PERL} ${srctree}/scripts/generate_initcall_order.pl \ | |
55 | ${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS} \ | |
56 | > .tmp_initcalls.lds | |
57 | } | |
58 | ||
38e89184 ST |
59 | # If CONFIG_LTO_CLANG is selected, collect generated symbol versions into |
60 | # .tmp_symversions.lds | |
61 | gen_symversions() | |
62 | { | |
63 | info GEN .tmp_symversions.lds | |
64 | rm -f .tmp_symversions.lds | |
65 | ||
66 | for o in ${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS}; do | |
67 | if [ -f ${o}.symversions ]; then | |
68 | cat ${o}.symversions >> .tmp_symversions.lds | |
69 | fi | |
70 | done | |
71 | } | |
72 | ||
1f2bfbd0 SR |
73 | # Link of vmlinux.o used for section mismatch analysis |
74 | # ${1} output file | |
75 | modpost_link() | |
76 | { | |
a5967db9 | 77 | local objects |
38e89184 | 78 | local lds="" |
a5967db9 | 79 | |
6358d6e8 | 80 | objects="--whole-archive \ |
d151e971 | 81 | ${KBUILD_VMLINUX_OBJS} \ |
6358d6e8 NP |
82 | --no-whole-archive \ |
83 | --start-group \ | |
84 | ${KBUILD_VMLINUX_LIBS} \ | |
85 | --end-group" | |
86 | ||
7d153696 | 87 | if is_enabled CONFIG_LTO_CLANG; then |
a8cccdd9 ST |
88 | gen_initcalls |
89 | lds="-T .tmp_initcalls.lds" | |
90 | ||
7d153696 | 91 | if is_enabled CONFIG_MODVERSIONS; then |
38e89184 ST |
92 | gen_symversions |
93 | lds="${lds} -T .tmp_symversions.lds" | |
94 | fi | |
95 | ||
dc5723b0 ST |
96 | # This might take a while, so indicate that we're doing |
97 | # an LTO link | |
98 | info LTO ${1} | |
99 | else | |
100 | info LD ${1} | |
101 | fi | |
102 | ||
38e89184 | 103 | ${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${lds} ${objects} |
1f2bfbd0 SR |
104 | } |
105 | ||
6804c1af PZ |
106 | objtool_link() |
107 | { | |
b1a1a1a0 | 108 | local objtoolcmd; |
6804c1af PZ |
109 | local objtoolopt; |
110 | ||
7d153696 | 111 | if is_enabled CONFIG_LTO_CLANG && is_enabled CONFIG_STACK_VALIDATION; then |
b1a1a1a0 ST |
112 | # Don't perform vmlinux validation unless explicitly requested, |
113 | # but run objtool on vmlinux.o now that we have an object file. | |
7d153696 | 114 | if is_enabled CONFIG_UNWINDER_ORC; then |
b1a1a1a0 ST |
115 | objtoolcmd="orc generate" |
116 | fi | |
117 | ||
118 | objtoolopt="${objtoolopt} --duplicate" | |
119 | ||
7d153696 | 120 | if is_enabled CONFIG_FTRACE_MCOUNT_USE_OBJTOOL; then |
b1a1a1a0 ST |
121 | objtoolopt="${objtoolopt} --mcount" |
122 | fi | |
123 | fi | |
124 | ||
7d153696 | 125 | if is_enabled CONFIG_VMLINUX_VALIDATION; then |
b1a1a1a0 ST |
126 | objtoolopt="${objtoolopt} --noinstr" |
127 | fi | |
128 | ||
129 | if [ -n "${objtoolopt}" ]; then | |
130 | if [ -z "${objtoolcmd}" ]; then | |
131 | objtoolcmd="check" | |
132 | fi | |
133 | objtoolopt="${objtoolopt} --vmlinux" | |
7d153696 | 134 | if ! is_enabled CONFIG_FRAME_POINTER; then |
6804c1af PZ |
135 | objtoolopt="${objtoolopt} --no-fp" |
136 | fi | |
7d153696 | 137 | if is_enabled CONFIG_GCOV_KERNEL || is_enabled CONFIG_LTO_CLANG; then |
6804c1af PZ |
138 | objtoolopt="${objtoolopt} --no-unreachable" |
139 | fi | |
7d153696 | 140 | if is_enabled CONFIG_RETPOLINE; then |
6804c1af PZ |
141 | objtoolopt="${objtoolopt} --retpoline" |
142 | fi | |
7d153696 | 143 | if is_enabled CONFIG_X86_SMAP; then |
6804c1af PZ |
144 | objtoolopt="${objtoolopt} --uaccess" |
145 | fi | |
fd6f57bf | 146 | if is_enabled CONFIG_SLS; then |
e463a09a PZ |
147 | objtoolopt="${objtoolopt} --sls" |
148 | fi | |
6804c1af | 149 | info OBJTOOL ${1} |
b1a1a1a0 | 150 | tools/objtool/objtool ${objtoolcmd} ${objtoolopt} ${1} |
6804c1af PZ |
151 | fi |
152 | } | |
153 | ||
1f2bfbd0 | 154 | # Link of vmlinux |
341dfcf8 | 155 | # ${1} - output file |
618916a4 | 156 | # ${2}, ${3}, ... - optional extra .o files |
1f2bfbd0 SR |
157 | vmlinux_link() |
158 | { | |
618916a4 | 159 | local output=${1} |
8f130512 MY |
160 | local objs |
161 | local libs | |
5df77ad6 MY |
162 | local ld |
163 | local ldflags | |
164 | local ldlibs | |
1f2bfbd0 | 165 | |
d7b0827f LT |
166 | info LD ${output} |
167 | ||
618916a4 AN |
168 | # skip output file argument |
169 | shift | |
170 | ||
7d153696 | 171 | if is_enabled CONFIG_LTO_CLANG; then |
8f130512 MY |
172 | # Use vmlinux.o instead of performing the slow LTO link again. |
173 | objs=vmlinux.o | |
174 | libs= | |
175 | else | |
176 | objs="${KBUILD_VMLINUX_OBJS}" | |
177 | libs="${KBUILD_VMLINUX_LIBS}" | |
178 | fi | |
179 | ||
5df77ad6 MY |
180 | if [ "${SRCARCH}" = "um" ]; then |
181 | wl=-Wl, | |
182 | ld="${CC}" | |
183 | ldflags="${CFLAGS_vmlinux}" | |
184 | ldlibs="-lutil -lrt -lpthread" | |
185 | else | |
186 | wl= | |
187 | ld="${LD}" | |
188 | ldflags="${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux}" | |
189 | ldlibs= | |
190 | fi | |
191 | ||
192 | ldflags="${ldflags} ${wl}--script=${objtree}/${KBUILD_LDS}" | |
193 | ||
af73d78b KC |
194 | # The kallsyms linking does not need debug symbols included. |
195 | if [ "$output" != "${output#.tmp_vmlinux.kallsyms}" ] ; then | |
5df77ad6 | 196 | ldflags="${ldflags} ${wl}--strip-debug" |
af73d78b KC |
197 | fi |
198 | ||
7d153696 | 199 | if is_enabled CONFIG_VMLINUX_MAP; then |
5df77ad6 | 200 | ldflags="${ldflags} ${wl}-Map=${output}.map" |
5cc12472 RV |
201 | fi |
202 | ||
5df77ad6 MY |
203 | ${ld} ${ldflags} -o ${output} \ |
204 | ${wl}--whole-archive ${objs} ${wl}--no-whole-archive \ | |
205 | ${wl}--start-group ${libs} ${wl}--end-group \ | |
206 | $@ ${ldlibs} | |
1f2bfbd0 SR |
207 | } |
208 | ||
e83b9f55 | 209 | # generate .BTF typeinfo from DWARF debuginfo |
341dfcf8 AN |
210 | # ${1} - vmlinux image |
211 | # ${2} - file to dump raw BTF data into | |
e83b9f55 AN |
212 | gen_btf() |
213 | { | |
341dfcf8 | 214 | local pahole_ver |
e83b9f55 | 215 | |
581b31c3 | 216 | if ! [ -x "$(command -v ${PAHOLE})" ]; then |
2a67a6cc | 217 | echo >&2 "BTF: ${1}: pahole (${PAHOLE}) is not available" |
341dfcf8 | 218 | return 1 |
581b31c3 AN |
219 | fi |
220 | ||
e83b9f55 | 221 | pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/') |
21a85bd6 LB |
222 | if [ "${pahole_ver}" -lt "116" ]; then |
223 | echo >&2 "BTF: ${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.16" | |
341dfcf8 | 224 | return 1 |
e83b9f55 AN |
225 | fi |
226 | ||
341dfcf8 | 227 | vmlinux_link ${1} |
af73d78b KC |
228 | |
229 | info "BTF" ${2} | |
9741e07e | 230 | LLVM_OBJCOPY="${OBJCOPY}" ${PAHOLE} -J ${PAHOLE_FLAGS} ${1} |
341dfcf8 | 231 | |
90ceddcb FS |
232 | # Create ${2} which contains just .BTF section but no symbols. Add |
233 | # SHF_ALLOC because .BTF will be part of the vmlinux image. --strip-all | |
234 | # deletes all symbols including __start_BTF and __stop_BTF, which will | |
235 | # be redefined in the linker script. Add 2>/dev/null to suppress GNU | |
236 | # objcopy warnings: "empty loadable segment detected at ..." | |
237 | ${OBJCOPY} --only-section=.BTF --set-section-flags .BTF=alloc,readonly \ | |
238 | --strip-all ${1} ${2} 2>/dev/null | |
239 | # Change e_type to ET_REL so that it can be used to link final vmlinux. | |
240 | # Unlike GNU ld, lld does not allow an ET_EXEC input. | |
241 | printf '\1' | dd of=${2} conv=notrunc bs=1 seek=16 status=none | |
e83b9f55 | 242 | } |
1f2bfbd0 | 243 | |
08beb669 | 244 | # Create ${2} .S file with all symbols from the ${1} object file |
1f2bfbd0 SR |
245 | kallsyms() |
246 | { | |
1f2bfbd0 SR |
247 | local kallsymopt; |
248 | ||
7d153696 | 249 | if is_enabled CONFIG_KALLSYMS_ALL; then |
6895f97e | 250 | kallsymopt="${kallsymopt} --all-symbols" |
1f2bfbd0 SR |
251 | fi |
252 | ||
7d153696 | 253 | if is_enabled CONFIG_KALLSYMS_ABSOLUTE_PERCPU; then |
c6bda7c9 RR |
254 | kallsymopt="${kallsymopt} --absolute-percpu" |
255 | fi | |
256 | ||
7d153696 | 257 | if is_enabled CONFIG_KALLSYMS_BASE_RELATIVE; then |
2213e9a6 AB |
258 | kallsymopt="${kallsymopt} --base-relative" |
259 | fi | |
260 | ||
08beb669 MY |
261 | info KSYMS ${2} |
262 | ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${2} | |
1f2bfbd0 SR |
263 | } |
264 | ||
8959e392 KC |
265 | # Perform one step in kallsyms generation, including temporary linking of |
266 | # vmlinux. | |
267 | kallsyms_step() | |
268 | { | |
269 | kallsymso_prev=${kallsymso} | |
af73d78b KC |
270 | kallsyms_vmlinux=.tmp_vmlinux.kallsyms${1} |
271 | kallsymso=${kallsyms_vmlinux}.o | |
08beb669 | 272 | kallsyms_S=${kallsyms_vmlinux}.S |
8959e392 | 273 | |
d7b0827f | 274 | vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o} |
08beb669 MY |
275 | kallsyms ${kallsyms_vmlinux} ${kallsyms_S} |
276 | ||
277 | info AS ${kallsyms_S} | |
278 | ${CC} ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS} \ | |
279 | ${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ | |
280 | -c -o ${kallsymso} ${kallsyms_S} | |
8959e392 KC |
281 | } |
282 | ||
1f2bfbd0 SR |
283 | # Create map file with all symbols from ${1} |
284 | # See mksymap for additional details | |
285 | mksysmap() | |
286 | { | |
287 | ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} | |
288 | } | |
289 | ||
10916706 | 290 | sorttable() |
1347a2ce | 291 | { |
10916706 | 292 | ${objtree}/scripts/sorttable ${1} |
1347a2ce LT |
293 | } |
294 | ||
1f2bfbd0 | 295 | # Delete output files in case of error |
1f2bfbd0 SR |
296 | cleanup() |
297 | { | |
341dfcf8 | 298 | rm -f .btf.* |
1f2bfbd0 | 299 | rm -f .tmp_System.map |
a8cccdd9 | 300 | rm -f .tmp_initcalls.lds |
38e89184 | 301 | rm -f .tmp_symversions.lds |
1f2bfbd0 SR |
302 | rm -f .tmp_vmlinux* |
303 | rm -f System.map | |
304 | rm -f vmlinux | |
5cc12472 | 305 | rm -f vmlinux.map |
1f2bfbd0 | 306 | rm -f vmlinux.o |
0b956e20 | 307 | rm -f .vmlinux.d |
1f2bfbd0 SR |
308 | } |
309 | ||
1f2bfbd0 SR |
310 | # Use "make V=1" to debug this script |
311 | case "${KBUILD_VERBOSE}" in | |
312 | *1*) | |
313 | set -x | |
314 | ;; | |
315 | esac | |
316 | ||
317 | if [ "$1" = "clean" ]; then | |
318 | cleanup | |
319 | exit 0 | |
320 | fi | |
321 | ||
1f2bfbd0 SR |
322 | # Update version |
323 | info GEN .version | |
278ae604 MY |
324 | if [ -r .version ]; then |
325 | VERSION=$(expr 0$(cat .version) + 1) | |
326 | echo $VERSION > .version | |
1f2bfbd0 | 327 | else |
278ae604 MY |
328 | rm -f .version |
329 | echo 1 > .version | |
1f2bfbd0 SR |
330 | fi; |
331 | ||
332 | # final build of init/ | |
083bc0e1 | 333 | ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1 |
1f2bfbd0 | 334 | |
abac4c89 | 335 | #link vmlinux.o |
abac4c89 | 336 | modpost_link vmlinux.o |
6804c1af | 337 | objtool_link vmlinux.o |
abac4c89 NP |
338 | |
339 | # modpost vmlinux.o to check for section mismatches | |
a721588d | 340 | ${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1 |
abac4c89 | 341 | |
898490c0 AG |
342 | info MODINFO modules.builtin.modinfo |
343 | ${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo | |
8b41fc44 MY |
344 | info GEN modules.builtin |
345 | # The second line aids cases where multiple modules share the same object. | |
346 | tr '\0' '\n' < modules.builtin.modinfo | sed -n 's/^[[:alnum:]:_]*\.file=//p' | | |
347 | tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$/.ko/' > modules.builtin | |
898490c0 | 348 | |
7fd78568 | 349 | btf_vmlinux_bin_o="" |
7d153696 | 350 | if is_enabled CONFIG_DEBUG_INFO_BTF; then |
af73d78b KC |
351 | btf_vmlinux_bin_o=.btf.vmlinux.bin.o |
352 | if ! gen_btf .tmp_vmlinux.btf $btf_vmlinux_bin_o ; then | |
da5fb182 SF |
353 | echo >&2 "Failed to generate BTF for vmlinux" |
354 | echo >&2 "Try to disable CONFIG_DEBUG_INFO_BTF" | |
355 | exit 1 | |
341dfcf8 AN |
356 | fi |
357 | fi | |
358 | ||
1f2bfbd0 | 359 | kallsymso="" |
8959e392 | 360 | kallsymso_prev="" |
1f2bfbd0 | 361 | kallsyms_vmlinux="" |
7d153696 | 362 | if is_enabled CONFIG_KALLSYMS; then |
1f2bfbd0 SR |
363 | |
364 | # kallsyms support | |
365 | # Generate section listing all symbols and add it into vmlinux | |
366 | # It's a three step process: | |
2216cf68 | 367 | # 1) Link .tmp_vmlinux.kallsyms1 so it has all symbols and sections, |
1f2bfbd0 SR |
368 | # but __kallsyms is empty. |
369 | # Running kallsyms on that gives us .tmp_kallsyms1.o with | |
370 | # the right size | |
2216cf68 | 371 | # 2) Link .tmp_vmlinux.kallsyms2 so it now has a __kallsyms section of |
1f2bfbd0 SR |
372 | # the right size, but due to the added section, some |
373 | # addresses have shifted. | |
2216cf68 | 374 | # From here, we generate a correct .tmp_vmlinux.kallsyms2.o |
7e2b37c9 NP |
375 | # 3) That link may have expanded the kernel image enough that |
376 | # more linker branch stubs / trampolines had to be added, which | |
377 | # introduces new names, which further expands kallsyms. Do another | |
378 | # pass if that is the case. In theory it's possible this results | |
379 | # in even more stubs, but unlikely. | |
380 | # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around | |
381 | # other bugs. | |
382 | # 4) The correct ${kallsymso} is linked into the final vmlinux. | |
1f2bfbd0 SR |
383 | # |
384 | # a) Verify that the System.map from vmlinux matches the map from | |
385 | # ${kallsymso}. | |
386 | ||
8959e392 KC |
387 | kallsyms_step 1 |
388 | kallsyms_step 2 | |
1f2bfbd0 | 389 | |
7e2b37c9 | 390 | # step 3 |
8959e392 KC |
391 | size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso_prev}) |
392 | size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso}) | |
7e2b37c9 NP |
393 | |
394 | if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then | |
8959e392 | 395 | kallsyms_step 3 |
1f2bfbd0 SR |
396 | fi |
397 | fi | |
398 | ||
d7b0827f | 399 | vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o} |
e83b9f55 | 400 | |
c9a0f3b8 | 401 | # fill in BTF IDs |
7d153696 | 402 | if is_enabled CONFIG_DEBUG_INFO_BTF && is_enabled CONFIG_BPF; then |
017dab34 JO |
403 | info BTFIDS vmlinux |
404 | ${RESOLVE_BTFIDS} vmlinux | |
c9a0f3b8 JO |
405 | fi |
406 | ||
72b3942a YL |
407 | info SYSMAP System.map |
408 | mksysmap vmlinux System.map | |
409 | ||
7d153696 | 410 | if is_enabled CONFIG_BUILDTIME_TABLE_SORT; then |
10916706 | 411 | info SORTTAB vmlinux |
f14bf6a3 SZ |
412 | if ! sorttable vmlinux; then |
413 | echo >&2 Failed to sort kernel tables | |
414 | exit 1 | |
415 | fi | |
1347a2ce LT |
416 | fi |
417 | ||
1f2bfbd0 | 418 | # step a (see comment above) |
7d153696 | 419 | if is_enabled CONFIG_KALLSYMS; then |
1f2bfbd0 SR |
420 | mksysmap ${kallsyms_vmlinux} .tmp_System.map |
421 | ||
422 | if ! cmp -s System.map .tmp_System.map; then | |
5369f550 | 423 | echo >&2 Inconsistent kallsyms data |
367e43c5 | 424 | echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround |
1f2bfbd0 SR |
425 | exit 1 |
426 | fi | |
427 | fi | |
0b956e20 RV |
428 | |
429 | # For fixdep | |
430 | echo "vmlinux: $0" > .vmlinux.d |