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="$3" | |
36 | ||
1f2bfbd0 SR |
37 | # Nice output in kbuild format |
38 | # Will be supressed by "make -s" | |
39 | info() | |
40 | { | |
41 | if [ "${quiet}" != "silent_" ]; then | |
e83b9f55 | 42 | printf " %-7s %s\n" "${1}" "${2}" |
1f2bfbd0 SR |
43 | fi |
44 | } | |
45 | ||
46 | # Link of vmlinux.o used for section mismatch analysis | |
47 | # ${1} output file | |
48 | modpost_link() | |
49 | { | |
a5967db9 SR |
50 | local objects |
51 | ||
6358d6e8 | 52 | objects="--whole-archive \ |
d151e971 | 53 | ${KBUILD_VMLINUX_OBJS} \ |
6358d6e8 NP |
54 | --no-whole-archive \ |
55 | --start-group \ | |
56 | ${KBUILD_VMLINUX_LIBS} \ | |
57 | --end-group" | |
58 | ||
d503ac53 | 59 | ${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${objects} |
1f2bfbd0 SR |
60 | } |
61 | ||
6804c1af PZ |
62 | objtool_link() |
63 | { | |
64 | local objtoolopt; | |
65 | ||
66 | if [ -n "${CONFIG_VMLINUX_VALIDATION}" ]; then | |
67 | objtoolopt="check" | |
68 | if [ -z "${CONFIG_FRAME_POINTER}" ]; then | |
69 | objtoolopt="${objtoolopt} --no-fp" | |
70 | fi | |
71 | if [ -n "${CONFIG_GCOV_KERNEL}" ]; then | |
72 | objtoolopt="${objtoolopt} --no-unreachable" | |
73 | fi | |
74 | if [ -n "${CONFIG_RETPOLINE}" ]; then | |
75 | objtoolopt="${objtoolopt} --retpoline" | |
76 | fi | |
77 | if [ -n "${CONFIG_X86_SMAP}" ]; then | |
78 | objtoolopt="${objtoolopt} --uaccess" | |
79 | fi | |
80 | info OBJTOOL ${1} | |
81 | tools/objtool/objtool ${objtoolopt} ${1} | |
82 | fi | |
83 | } | |
84 | ||
1f2bfbd0 | 85 | # Link of vmlinux |
341dfcf8 | 86 | # ${1} - output file |
618916a4 | 87 | # ${2}, ${3}, ... - optional extra .o files |
1f2bfbd0 SR |
88 | vmlinux_link() |
89 | { | |
90 | local lds="${objtree}/${KBUILD_LDS}" | |
618916a4 | 91 | local output=${1} |
a5967db9 | 92 | local objects |
af73d78b | 93 | local strip_debug |
1f2bfbd0 | 94 | |
d7b0827f LT |
95 | info LD ${output} |
96 | ||
618916a4 AN |
97 | # skip output file argument |
98 | shift | |
99 | ||
af73d78b KC |
100 | # The kallsyms linking does not need debug symbols included. |
101 | if [ "$output" != "${output#.tmp_vmlinux.kallsyms}" ] ; then | |
102 | strip_debug=-Wl,--strip-debug | |
103 | fi | |
104 | ||
1f2bfbd0 | 105 | if [ "${SRCARCH}" != "um" ]; then |
6358d6e8 | 106 | objects="--whole-archive \ |
d151e971 | 107 | ${KBUILD_VMLINUX_OBJS} \ |
6358d6e8 NP |
108 | --no-whole-archive \ |
109 | --start-group \ | |
110 | ${KBUILD_VMLINUX_LIBS} \ | |
111 | --end-group \ | |
618916a4 | 112 | ${@}" |
a5967db9 | 113 | |
618916a4 | 114 | ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} \ |
af73d78b | 115 | ${strip_debug#-Wl,} \ |
618916a4 | 116 | -o ${output} \ |
a5967db9 | 117 | -T ${lds} ${objects} |
1f2bfbd0 | 118 | else |
6358d6e8 | 119 | objects="-Wl,--whole-archive \ |
d151e971 | 120 | ${KBUILD_VMLINUX_OBJS} \ |
6358d6e8 NP |
121 | -Wl,--no-whole-archive \ |
122 | -Wl,--start-group \ | |
123 | ${KBUILD_VMLINUX_LIBS} \ | |
124 | -Wl,--end-group \ | |
618916a4 | 125 | ${@}" |
a5967db9 | 126 | |
618916a4 | 127 | ${CC} ${CFLAGS_vmlinux} \ |
af73d78b | 128 | ${strip_debug} \ |
618916a4 | 129 | -o ${output} \ |
6358d6e8 NP |
130 | -Wl,-T,${lds} \ |
131 | ${objects} \ | |
a5967db9 | 132 | -lutil -lrt -lpthread |
1f2bfbd0 SR |
133 | rm -f linux |
134 | fi | |
135 | } | |
136 | ||
e83b9f55 | 137 | # generate .BTF typeinfo from DWARF debuginfo |
341dfcf8 AN |
138 | # ${1} - vmlinux image |
139 | # ${2} - file to dump raw BTF data into | |
e83b9f55 AN |
140 | gen_btf() |
141 | { | |
341dfcf8 | 142 | local pahole_ver |
e83b9f55 | 143 | |
581b31c3 | 144 | if ! [ -x "$(command -v ${PAHOLE})" ]; then |
2a67a6cc | 145 | echo >&2 "BTF: ${1}: pahole (${PAHOLE}) is not available" |
341dfcf8 | 146 | return 1 |
581b31c3 AN |
147 | fi |
148 | ||
e83b9f55 | 149 | pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/') |
21a85bd6 LB |
150 | if [ "${pahole_ver}" -lt "116" ]; then |
151 | echo >&2 "BTF: ${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.16" | |
341dfcf8 | 152 | return 1 |
e83b9f55 AN |
153 | fi |
154 | ||
341dfcf8 | 155 | vmlinux_link ${1} |
af73d78b KC |
156 | |
157 | info "BTF" ${2} | |
e83b9f55 | 158 | LLVM_OBJCOPY=${OBJCOPY} ${PAHOLE} -J ${1} |
341dfcf8 | 159 | |
90ceddcb FS |
160 | # Create ${2} which contains just .BTF section but no symbols. Add |
161 | # SHF_ALLOC because .BTF will be part of the vmlinux image. --strip-all | |
162 | # deletes all symbols including __start_BTF and __stop_BTF, which will | |
163 | # be redefined in the linker script. Add 2>/dev/null to suppress GNU | |
164 | # objcopy warnings: "empty loadable segment detected at ..." | |
165 | ${OBJCOPY} --only-section=.BTF --set-section-flags .BTF=alloc,readonly \ | |
166 | --strip-all ${1} ${2} 2>/dev/null | |
167 | # Change e_type to ET_REL so that it can be used to link final vmlinux. | |
168 | # Unlike GNU ld, lld does not allow an ET_EXEC input. | |
169 | printf '\1' | dd of=${2} conv=notrunc bs=1 seek=16 status=none | |
e83b9f55 | 170 | } |
1f2bfbd0 | 171 | |
08beb669 | 172 | # Create ${2} .S file with all symbols from the ${1} object file |
1f2bfbd0 SR |
173 | kallsyms() |
174 | { | |
1f2bfbd0 SR |
175 | local kallsymopt; |
176 | ||
177 | if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then | |
6895f97e | 178 | kallsymopt="${kallsymopt} --all-symbols" |
1f2bfbd0 SR |
179 | fi |
180 | ||
4d5d5664 | 181 | if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then |
c6bda7c9 RR |
182 | kallsymopt="${kallsymopt} --absolute-percpu" |
183 | fi | |
184 | ||
2213e9a6 AB |
185 | if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then |
186 | kallsymopt="${kallsymopt} --base-relative" | |
187 | fi | |
188 | ||
08beb669 MY |
189 | info KSYMS ${2} |
190 | ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${2} | |
1f2bfbd0 SR |
191 | } |
192 | ||
8959e392 KC |
193 | # Perform one step in kallsyms generation, including temporary linking of |
194 | # vmlinux. | |
195 | kallsyms_step() | |
196 | { | |
197 | kallsymso_prev=${kallsymso} | |
af73d78b KC |
198 | kallsyms_vmlinux=.tmp_vmlinux.kallsyms${1} |
199 | kallsymso=${kallsyms_vmlinux}.o | |
08beb669 | 200 | kallsyms_S=${kallsyms_vmlinux}.S |
8959e392 | 201 | |
d7b0827f | 202 | vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o} |
08beb669 MY |
203 | kallsyms ${kallsyms_vmlinux} ${kallsyms_S} |
204 | ||
205 | info AS ${kallsyms_S} | |
206 | ${CC} ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS} \ | |
207 | ${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ | |
208 | -c -o ${kallsymso} ${kallsyms_S} | |
8959e392 KC |
209 | } |
210 | ||
1f2bfbd0 SR |
211 | # Create map file with all symbols from ${1} |
212 | # See mksymap for additional details | |
213 | mksysmap() | |
214 | { | |
215 | ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} | |
216 | } | |
217 | ||
10916706 | 218 | sorttable() |
1347a2ce | 219 | { |
10916706 | 220 | ${objtree}/scripts/sorttable ${1} |
1347a2ce LT |
221 | } |
222 | ||
1f2bfbd0 | 223 | # Delete output files in case of error |
1f2bfbd0 SR |
224 | cleanup() |
225 | { | |
341dfcf8 | 226 | rm -f .btf.* |
1f2bfbd0 | 227 | rm -f .tmp_System.map |
1f2bfbd0 SR |
228 | rm -f .tmp_vmlinux* |
229 | rm -f System.map | |
230 | rm -f vmlinux | |
231 | rm -f vmlinux.o | |
232 | } | |
233 | ||
ab160dbb SB |
234 | on_exit() |
235 | { | |
236 | if [ $? -ne 0 ]; then | |
237 | cleanup | |
238 | fi | |
239 | } | |
240 | trap on_exit EXIT | |
241 | ||
242 | on_signals() | |
243 | { | |
244 | exit 1 | |
245 | } | |
246 | trap on_signals HUP INT QUIT TERM | |
247 | ||
1f2bfbd0 SR |
248 | # Use "make V=1" to debug this script |
249 | case "${KBUILD_VERBOSE}" in | |
250 | *1*) | |
251 | set -x | |
252 | ;; | |
253 | esac | |
254 | ||
255 | if [ "$1" = "clean" ]; then | |
256 | cleanup | |
257 | exit 0 | |
258 | fi | |
259 | ||
260 | # We need access to CONFIG_ symbols | |
94cf8acc | 261 | . include/config/auto.conf |
1f2bfbd0 | 262 | |
1f2bfbd0 SR |
263 | # Update version |
264 | info GEN .version | |
278ae604 MY |
265 | if [ -r .version ]; then |
266 | VERSION=$(expr 0$(cat .version) + 1) | |
267 | echo $VERSION > .version | |
1f2bfbd0 | 268 | else |
278ae604 MY |
269 | rm -f .version |
270 | echo 1 > .version | |
1f2bfbd0 SR |
271 | fi; |
272 | ||
273 | # final build of init/ | |
083bc0e1 | 274 | ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1 |
1f2bfbd0 | 275 | |
abac4c89 NP |
276 | #link vmlinux.o |
277 | info LD vmlinux.o | |
278 | modpost_link vmlinux.o | |
6804c1af | 279 | objtool_link vmlinux.o |
abac4c89 NP |
280 | |
281 | # modpost vmlinux.o to check for section mismatches | |
a721588d | 282 | ${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1 |
abac4c89 | 283 | |
898490c0 AG |
284 | info MODINFO modules.builtin.modinfo |
285 | ${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo | |
8b41fc44 MY |
286 | info GEN modules.builtin |
287 | # The second line aids cases where multiple modules share the same object. | |
288 | tr '\0' '\n' < modules.builtin.modinfo | sed -n 's/^[[:alnum:]:_]*\.file=//p' | | |
289 | tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$/.ko/' > modules.builtin | |
898490c0 | 290 | |
7fd78568 | 291 | btf_vmlinux_bin_o="" |
341dfcf8 | 292 | if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then |
af73d78b KC |
293 | btf_vmlinux_bin_o=.btf.vmlinux.bin.o |
294 | if ! gen_btf .tmp_vmlinux.btf $btf_vmlinux_bin_o ; then | |
da5fb182 SF |
295 | echo >&2 "Failed to generate BTF for vmlinux" |
296 | echo >&2 "Try to disable CONFIG_DEBUG_INFO_BTF" | |
297 | exit 1 | |
341dfcf8 AN |
298 | fi |
299 | fi | |
300 | ||
1f2bfbd0 | 301 | kallsymso="" |
8959e392 | 302 | kallsymso_prev="" |
1f2bfbd0 SR |
303 | kallsyms_vmlinux="" |
304 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
305 | ||
306 | # kallsyms support | |
307 | # Generate section listing all symbols and add it into vmlinux | |
308 | # It's a three step process: | |
309 | # 1) Link .tmp_vmlinux1 so it has all symbols and sections, | |
310 | # but __kallsyms is empty. | |
311 | # Running kallsyms on that gives us .tmp_kallsyms1.o with | |
312 | # the right size | |
313 | # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of | |
314 | # the right size, but due to the added section, some | |
315 | # addresses have shifted. | |
316 | # From here, we generate a correct .tmp_kallsyms2.o | |
7e2b37c9 NP |
317 | # 3) That link may have expanded the kernel image enough that |
318 | # more linker branch stubs / trampolines had to be added, which | |
319 | # introduces new names, which further expands kallsyms. Do another | |
320 | # pass if that is the case. In theory it's possible this results | |
321 | # in even more stubs, but unlikely. | |
322 | # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around | |
323 | # other bugs. | |
324 | # 4) The correct ${kallsymso} is linked into the final vmlinux. | |
1f2bfbd0 SR |
325 | # |
326 | # a) Verify that the System.map from vmlinux matches the map from | |
327 | # ${kallsymso}. | |
328 | ||
8959e392 KC |
329 | kallsyms_step 1 |
330 | kallsyms_step 2 | |
1f2bfbd0 | 331 | |
7e2b37c9 | 332 | # step 3 |
8959e392 KC |
333 | size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso_prev}) |
334 | size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso}) | |
7e2b37c9 NP |
335 | |
336 | if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then | |
8959e392 | 337 | kallsyms_step 3 |
1f2bfbd0 SR |
338 | fi |
339 | fi | |
340 | ||
d7b0827f | 341 | vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o} |
e83b9f55 | 342 | |
c9a0f3b8 | 343 | # fill in BTF IDs |
017dab34 JO |
344 | if [ -n "${CONFIG_DEBUG_INFO_BTF}" -a -n "${CONFIG_BPF}" ]; then |
345 | info BTFIDS vmlinux | |
346 | ${RESOLVE_BTFIDS} vmlinux | |
c9a0f3b8 JO |
347 | fi |
348 | ||
10916706 SZ |
349 | if [ -n "${CONFIG_BUILDTIME_TABLE_SORT}" ]; then |
350 | info SORTTAB vmlinux | |
f14bf6a3 SZ |
351 | if ! sorttable vmlinux; then |
352 | echo >&2 Failed to sort kernel tables | |
353 | exit 1 | |
354 | fi | |
1347a2ce LT |
355 | fi |
356 | ||
1f2bfbd0 SR |
357 | info SYSMAP System.map |
358 | mksysmap vmlinux System.map | |
359 | ||
360 | # step a (see comment above) | |
361 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
362 | mksysmap ${kallsyms_vmlinux} .tmp_System.map | |
363 | ||
364 | if ! cmp -s System.map .tmp_System.map; then | |
5369f550 | 365 | echo >&2 Inconsistent kallsyms data |
367e43c5 | 366 | echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround |
1f2bfbd0 SR |
367 | exit 1 |
368 | fi | |
369 | fi |