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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 | ||
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 | ||
1f2bfbd0 | 48 | # Link of vmlinux |
341dfcf8 | 49 | # ${1} - output file |
618916a4 | 50 | # ${2}, ${3}, ... - optional extra .o files |
1f2bfbd0 SR |
51 | vmlinux_link() |
52 | { | |
618916a4 | 53 | local output=${1} |
8f130512 MY |
54 | local objs |
55 | local libs | |
5df77ad6 MY |
56 | local ld |
57 | local ldflags | |
58 | local ldlibs | |
1f2bfbd0 | 59 | |
d7b0827f LT |
60 | info LD ${output} |
61 | ||
618916a4 AN |
62 | # skip output file argument |
63 | shift | |
64 | ||
ed53a0d9 | 65 | if is_enabled CONFIG_LTO_CLANG || is_enabled CONFIG_X86_KERNEL_IBT; then |
8f130512 MY |
66 | # Use vmlinux.o instead of performing the slow LTO link again. |
67 | objs=vmlinux.o | |
68 | libs= | |
69 | else | |
70 | objs="${KBUILD_VMLINUX_OBJS}" | |
71 | libs="${KBUILD_VMLINUX_LIBS}" | |
72 | fi | |
73 | ||
7b453719 MY |
74 | if is_enabled CONFIG_MODULES; then |
75 | objs="${objs} .vmlinux.export.o" | |
76 | fi | |
77 | ||
5df77ad6 MY |
78 | if [ "${SRCARCH}" = "um" ]; then |
79 | wl=-Wl, | |
80 | ld="${CC}" | |
81 | ldflags="${CFLAGS_vmlinux}" | |
82 | ldlibs="-lutil -lrt -lpthread" | |
83 | else | |
84 | wl= | |
85 | ld="${LD}" | |
86 | ldflags="${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux}" | |
87 | ldlibs= | |
88 | fi | |
89 | ||
90 | ldflags="${ldflags} ${wl}--script=${objtree}/${KBUILD_LDS}" | |
91 | ||
af73d78b KC |
92 | # The kallsyms linking does not need debug symbols included. |
93 | if [ "$output" != "${output#.tmp_vmlinux.kallsyms}" ] ; then | |
5df77ad6 | 94 | ldflags="${ldflags} ${wl}--strip-debug" |
af73d78b KC |
95 | fi |
96 | ||
7d153696 | 97 | if is_enabled CONFIG_VMLINUX_MAP; then |
5df77ad6 | 98 | ldflags="${ldflags} ${wl}-Map=${output}.map" |
5cc12472 RV |
99 | fi |
100 | ||
5df77ad6 MY |
101 | ${ld} ${ldflags} -o ${output} \ |
102 | ${wl}--whole-archive ${objs} ${wl}--no-whole-archive \ | |
103 | ${wl}--start-group ${libs} ${wl}--end-group \ | |
104 | $@ ${ldlibs} | |
1f2bfbd0 SR |
105 | } |
106 | ||
e83b9f55 | 107 | # generate .BTF typeinfo from DWARF debuginfo |
341dfcf8 AN |
108 | # ${1} - vmlinux image |
109 | # ${2} - file to dump raw BTF data into | |
e83b9f55 AN |
110 | gen_btf() |
111 | { | |
341dfcf8 | 112 | local pahole_ver |
e83b9f55 | 113 | |
581b31c3 | 114 | if ! [ -x "$(command -v ${PAHOLE})" ]; then |
2a67a6cc | 115 | echo >&2 "BTF: ${1}: pahole (${PAHOLE}) is not available" |
341dfcf8 | 116 | return 1 |
581b31c3 AN |
117 | fi |
118 | ||
e83b9f55 | 119 | pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/') |
21a85bd6 LB |
120 | if [ "${pahole_ver}" -lt "116" ]; then |
121 | echo >&2 "BTF: ${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.16" | |
341dfcf8 | 122 | return 1 |
e83b9f55 AN |
123 | fi |
124 | ||
341dfcf8 | 125 | vmlinux_link ${1} |
af73d78b KC |
126 | |
127 | info "BTF" ${2} | |
9741e07e | 128 | LLVM_OBJCOPY="${OBJCOPY}" ${PAHOLE} -J ${PAHOLE_FLAGS} ${1} |
341dfcf8 | 129 | |
90ceddcb FS |
130 | # Create ${2} which contains just .BTF section but no symbols. Add |
131 | # SHF_ALLOC because .BTF will be part of the vmlinux image. --strip-all | |
132 | # deletes all symbols including __start_BTF and __stop_BTF, which will | |
133 | # be redefined in the linker script. Add 2>/dev/null to suppress GNU | |
134 | # objcopy warnings: "empty loadable segment detected at ..." | |
135 | ${OBJCOPY} --only-section=.BTF --set-section-flags .BTF=alloc,readonly \ | |
136 | --strip-all ${1} ${2} 2>/dev/null | |
137 | # Change e_type to ET_REL so that it can be used to link final vmlinux. | |
138 | # Unlike GNU ld, lld does not allow an ET_EXEC input. | |
139 | printf '\1' | dd of=${2} conv=notrunc bs=1 seek=16 status=none | |
e83b9f55 | 140 | } |
1f2bfbd0 | 141 | |
08beb669 | 142 | # Create ${2} .S file with all symbols from the ${1} object file |
1f2bfbd0 SR |
143 | kallsyms() |
144 | { | |
1f2bfbd0 SR |
145 | local kallsymopt; |
146 | ||
7d153696 | 147 | if is_enabled CONFIG_KALLSYMS_ALL; then |
6895f97e | 148 | kallsymopt="${kallsymopt} --all-symbols" |
1f2bfbd0 SR |
149 | fi |
150 | ||
7d153696 | 151 | if is_enabled CONFIG_KALLSYMS_ABSOLUTE_PERCPU; then |
c6bda7c9 RR |
152 | kallsymopt="${kallsymopt} --absolute-percpu" |
153 | fi | |
154 | ||
7d153696 | 155 | if is_enabled CONFIG_KALLSYMS_BASE_RELATIVE; then |
2213e9a6 AB |
156 | kallsymopt="${kallsymopt} --base-relative" |
157 | fi | |
158 | ||
08beb669 MY |
159 | info KSYMS ${2} |
160 | ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${2} | |
1f2bfbd0 SR |
161 | } |
162 | ||
8959e392 KC |
163 | # Perform one step in kallsyms generation, including temporary linking of |
164 | # vmlinux. | |
165 | kallsyms_step() | |
166 | { | |
167 | kallsymso_prev=${kallsymso} | |
af73d78b KC |
168 | kallsyms_vmlinux=.tmp_vmlinux.kallsyms${1} |
169 | kallsymso=${kallsyms_vmlinux}.o | |
08beb669 | 170 | kallsyms_S=${kallsyms_vmlinux}.S |
8959e392 | 171 | |
d7b0827f | 172 | vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o} |
08beb669 MY |
173 | kallsyms ${kallsyms_vmlinux} ${kallsyms_S} |
174 | ||
175 | info AS ${kallsyms_S} | |
176 | ${CC} ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS} \ | |
177 | ${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ | |
178 | -c -o ${kallsymso} ${kallsyms_S} | |
8959e392 KC |
179 | } |
180 | ||
1f2bfbd0 SR |
181 | # Create map file with all symbols from ${1} |
182 | # See mksymap for additional details | |
183 | mksysmap() | |
184 | { | |
185 | ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} | |
186 | } | |
187 | ||
10916706 | 188 | sorttable() |
1347a2ce | 189 | { |
10916706 | 190 | ${objtree}/scripts/sorttable ${1} |
1347a2ce LT |
191 | } |
192 | ||
1f2bfbd0 | 193 | # Delete output files in case of error |
1f2bfbd0 SR |
194 | cleanup() |
195 | { | |
341dfcf8 | 196 | rm -f .btf.* |
1f2bfbd0 SR |
197 | rm -f System.map |
198 | rm -f vmlinux | |
5cc12472 | 199 | rm -f vmlinux.map |
e493f472 | 200 | rm -f .vmlinux.objs |
7b453719 | 201 | rm -f .vmlinux.export.c |
1f2bfbd0 SR |
202 | } |
203 | ||
1f2bfbd0 SR |
204 | # Use "make V=1" to debug this script |
205 | case "${KBUILD_VERBOSE}" in | |
206 | *1*) | |
207 | set -x | |
208 | ;; | |
209 | esac | |
210 | ||
211 | if [ "$1" = "clean" ]; then | |
212 | cleanup | |
213 | exit 0 | |
214 | fi | |
215 | ||
1f2bfbd0 SR |
216 | # Update version |
217 | info GEN .version | |
278ae604 MY |
218 | if [ -r .version ]; then |
219 | VERSION=$(expr 0$(cat .version) + 1) | |
220 | echo $VERSION > .version | |
1f2bfbd0 | 221 | else |
278ae604 MY |
222 | rm -f .version |
223 | echo 1 > .version | |
1f2bfbd0 SR |
224 | fi; |
225 | ||
226 | # final build of init/ | |
083bc0e1 | 227 | ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1 |
1f2bfbd0 | 228 | |
abac4c89 | 229 | #link vmlinux.o |
5d45950d | 230 | ${MAKE} -f "${srctree}/scripts/Makefile.vmlinux_o" |
abac4c89 | 231 | |
0aa24a79 MY |
232 | # Generate the list of in-tree objects in vmlinux |
233 | # | |
234 | # This is used to retrieve symbol versions generated by genksyms. | |
e493f472 MY |
235 | for f in ${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS}; do |
236 | case ${f} in | |
0aa24a79 MY |
237 | *libgcc.a) |
238 | # Some architectures do '$(CC) --print-libgcc-file-name' to | |
239 | # borrow libgcc.a from the toolchain. | |
240 | # There is no EXPORT_SYMBOL in external objects. Ignore this. | |
241 | ;; | |
e493f472 MY |
242 | *.a) |
243 | ${AR} t ${f} ;; | |
244 | *) | |
245 | echo ${f} ;; | |
246 | esac | |
247 | done > .vmlinux.objs | |
248 | ||
abac4c89 | 249 | # modpost vmlinux.o to check for section mismatches |
a721588d | 250 | ${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1 |
abac4c89 | 251 | |
898490c0 AG |
252 | info MODINFO modules.builtin.modinfo |
253 | ${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo | |
8b41fc44 MY |
254 | info GEN modules.builtin |
255 | # The second line aids cases where multiple modules share the same object. | |
256 | tr '\0' '\n' < modules.builtin.modinfo | sed -n 's/^[[:alnum:]:_]*\.file=//p' | | |
257 | tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$/.ko/' > modules.builtin | |
898490c0 | 258 | |
7b453719 MY |
259 | if is_enabled CONFIG_MODULES; then |
260 | ${MAKE} -f "${srctree}/scripts/Makefile.vmlinux" .vmlinux.export.o | |
261 | fi | |
262 | ||
7fd78568 | 263 | btf_vmlinux_bin_o="" |
7d153696 | 264 | if is_enabled CONFIG_DEBUG_INFO_BTF; then |
af73d78b KC |
265 | btf_vmlinux_bin_o=.btf.vmlinux.bin.o |
266 | if ! gen_btf .tmp_vmlinux.btf $btf_vmlinux_bin_o ; then | |
da5fb182 SF |
267 | echo >&2 "Failed to generate BTF for vmlinux" |
268 | echo >&2 "Try to disable CONFIG_DEBUG_INFO_BTF" | |
269 | exit 1 | |
341dfcf8 AN |
270 | fi |
271 | fi | |
272 | ||
1f2bfbd0 | 273 | kallsymso="" |
8959e392 | 274 | kallsymso_prev="" |
1f2bfbd0 | 275 | kallsyms_vmlinux="" |
7d153696 | 276 | if is_enabled CONFIG_KALLSYMS; then |
1f2bfbd0 SR |
277 | |
278 | # kallsyms support | |
279 | # Generate section listing all symbols and add it into vmlinux | |
280 | # It's a three step process: | |
2216cf68 | 281 | # 1) Link .tmp_vmlinux.kallsyms1 so it has all symbols and sections, |
1f2bfbd0 SR |
282 | # but __kallsyms is empty. |
283 | # Running kallsyms on that gives us .tmp_kallsyms1.o with | |
284 | # the right size | |
2216cf68 | 285 | # 2) Link .tmp_vmlinux.kallsyms2 so it now has a __kallsyms section of |
1f2bfbd0 SR |
286 | # the right size, but due to the added section, some |
287 | # addresses have shifted. | |
2216cf68 | 288 | # From here, we generate a correct .tmp_vmlinux.kallsyms2.o |
7e2b37c9 NP |
289 | # 3) That link may have expanded the kernel image enough that |
290 | # more linker branch stubs / trampolines had to be added, which | |
291 | # introduces new names, which further expands kallsyms. Do another | |
292 | # pass if that is the case. In theory it's possible this results | |
293 | # in even more stubs, but unlikely. | |
294 | # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around | |
295 | # other bugs. | |
296 | # 4) The correct ${kallsymso} is linked into the final vmlinux. | |
1f2bfbd0 SR |
297 | # |
298 | # a) Verify that the System.map from vmlinux matches the map from | |
299 | # ${kallsymso}. | |
300 | ||
8959e392 KC |
301 | kallsyms_step 1 |
302 | kallsyms_step 2 | |
1f2bfbd0 | 303 | |
7e2b37c9 | 304 | # step 3 |
8959e392 KC |
305 | size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso_prev}) |
306 | size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso}) | |
7e2b37c9 NP |
307 | |
308 | if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then | |
8959e392 | 309 | kallsyms_step 3 |
1f2bfbd0 SR |
310 | fi |
311 | fi | |
312 | ||
d7b0827f | 313 | vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o} |
e83b9f55 | 314 | |
c9a0f3b8 | 315 | # fill in BTF IDs |
7d153696 | 316 | if is_enabled CONFIG_DEBUG_INFO_BTF && is_enabled CONFIG_BPF; then |
017dab34 JO |
317 | info BTFIDS vmlinux |
318 | ${RESOLVE_BTFIDS} vmlinux | |
c9a0f3b8 JO |
319 | fi |
320 | ||
72b3942a YL |
321 | info SYSMAP System.map |
322 | mksysmap vmlinux System.map | |
323 | ||
7d153696 | 324 | if is_enabled CONFIG_BUILDTIME_TABLE_SORT; then |
10916706 | 325 | info SORTTAB vmlinux |
f14bf6a3 SZ |
326 | if ! sorttable vmlinux; then |
327 | echo >&2 Failed to sort kernel tables | |
328 | exit 1 | |
329 | fi | |
1347a2ce LT |
330 | fi |
331 | ||
1f2bfbd0 | 332 | # step a (see comment above) |
7d153696 | 333 | if is_enabled CONFIG_KALLSYMS; then |
1f2bfbd0 SR |
334 | mksysmap ${kallsyms_vmlinux} .tmp_System.map |
335 | ||
336 | if ! cmp -s System.map .tmp_System.map; then | |
5369f550 | 337 | echo >&2 Inconsistent kallsyms data |
367e43c5 | 338 | echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround |
1f2bfbd0 SR |
339 | exit 1 |
340 | fi | |
341 | fi | |
0b956e20 RV |
342 | |
343 | # For fixdep | |
344 | echo "vmlinux: $0" > .vmlinux.d |