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1#!/bin/sh
2#
3# link vmlinux
4#
5# vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_INIT) and
6# $(KBUILD_VMLINUX_MAIN). Most are built-in.o files from top-level directories
7# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
8# Ordering when linking is important, and $(KBUILD_VMLINUX_INIT) must be first.
9#
10# vmlinux
11# ^
12# |
13# +-< $(KBUILD_VMLINUX_INIT)
14# | +--< init/version.o + more
15# |
16# +--< $(KBUILD_VMLINUX_MAIN)
17# | +--< drivers/built-in.o mm/built-in.o + more
18# |
19# +-< ${kallsymso} (see description in KALLSYMS section)
20#
21# vmlinux version (uname -v) cannot be updated during normal
22# descending-into-subdirs phase since we do not yet know if we need to
23# update vmlinux.
24# Therefore this step is delayed until just before final link of vmlinux.
25#
26# System.map is generated to document addresses of all kernel symbols
27
28# Error out on error
29set -e
30
31# Nice output in kbuild format
32# Will be supressed by "make -s"
33info()
34{
35 if [ "${quiet}" != "silent_" ]; then
36 printf " %-7s %s\n" ${1} ${2}
37 fi
38}
39
40# Thin archive build here makes a final archive with
41# symbol table and indexes from vmlinux objects, which can be
42# used as input to linker.
43#
44# Traditional incremental style of link does not require this step
45#
46# built-in.o output file
47#
48archive_builtin()
49{
50 if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
51 info AR built-in.o
52 rm -f built-in.o;
53 ${AR} rcsT${KBUILD_ARFLAGS} built-in.o \
54 ${KBUILD_VMLINUX_INIT} \
55 ${KBUILD_VMLINUX_MAIN}
56 fi
57}
58
59# Link of vmlinux.o used for section mismatch analysis
60# ${1} output file
61modpost_link()
62{
63 local objects
64
65 if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
66 objects="--whole-archive built-in.o"
67 else
68 objects="${KBUILD_VMLINUX_INIT} \
69 --start-group \
70 ${KBUILD_VMLINUX_MAIN} \
71 --end-group"
72 fi
73 ${LD} ${LDFLAGS} -r -o ${1} ${objects}
74}
75
76# Link of vmlinux
77# ${1} - optional extra .o files
78# ${2} - output file
79vmlinux_link()
80{
81 local lds="${objtree}/${KBUILD_LDS}"
82 local objects
83
84 if [ "${SRCARCH}" != "um" ]; then
85 if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
86 objects="--whole-archive built-in.o ${1}"
87 else
88 objects="${KBUILD_VMLINUX_INIT} \
89 --start-group \
90 ${KBUILD_VMLINUX_MAIN} \
91 --end-group \
92 ${1}"
93 fi
94
95 ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} \
96 -T ${lds} ${objects}
97 else
98 if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
99 objects="-Wl,--whole-archive built-in.o ${1}"
100 else
101 objects="${KBUILD_VMLINUX_INIT} \
102 -Wl,--start-group \
103 ${KBUILD_VMLINUX_MAIN} \
104 -Wl,--end-group \
105 ${1}"
106 fi
107
108 ${CC} ${CFLAGS_vmlinux} -o ${2} \
109 -Wl,-T,${lds} \
110 ${objects} \
111 -lutil -lrt -lpthread
112 rm -f linux
113 fi
114}
115
116
117# Create ${2} .o file with all symbols from the ${1} object file
118kallsyms()
119{
120 info KSYM ${2}
121 local kallsymopt;
122
123 if [ -n "${CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX}" ]; then
124 kallsymopt="${kallsymopt} --symbol-prefix=_"
125 fi
126
127 if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
128 kallsymopt="${kallsymopt} --all-symbols"
129 fi
130
131 if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then
132 kallsymopt="${kallsymopt} --absolute-percpu"
133 fi
134
135 if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then
136 kallsymopt="${kallsymopt} --base-relative"
137 fi
138
139 local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
140 ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
141
142 local afile="`basename ${2} .o`.S"
143
144 ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile}
145 ${CC} ${aflags} -c -o ${2} ${afile}
146}
147
148# Create map file with all symbols from ${1}
149# See mksymap for additional details
150mksysmap()
151{
152 ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
153}
154
155sortextable()
156{
157 ${objtree}/scripts/sortextable ${1}
158}
159
160# Delete output files in case of error
161cleanup()
162{
163 rm -f .old_version
164 rm -f .tmp_System.map
165 rm -f .tmp_kallsyms*
166 rm -f .tmp_version
167 rm -f .tmp_vmlinux*
168 rm -f built-in.o
169 rm -f System.map
170 rm -f vmlinux
171 rm -f vmlinux.o
172}
173
174on_exit()
175{
176 if [ $? -ne 0 ]; then
177 cleanup
178 fi
179}
180trap on_exit EXIT
181
182on_signals()
183{
184 exit 1
185}
186trap on_signals HUP INT QUIT TERM
187
188#
189#
190# Use "make V=1" to debug this script
191case "${KBUILD_VERBOSE}" in
192*1*)
193 set -x
194 ;;
195esac
196
197if [ "$1" = "clean" ]; then
198 cleanup
199 exit 0
200fi
201
202# We need access to CONFIG_ symbols
203case "${KCONFIG_CONFIG}" in
204*/*)
205 . "${KCONFIG_CONFIG}"
206 ;;
207*)
208 # Force using a file from the current directory
209 . "./${KCONFIG_CONFIG}"
210esac
211
212# Update version
213info GEN .version
214if [ ! -r .version ]; then
215 rm -f .version;
216 echo 1 >.version;
217else
218 mv .version .old_version;
219 expr 0$(cat .old_version) + 1 >.version;
220fi;
221
222# final build of init/
223${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init GCC_PLUGINS_CFLAGS="${GCC_PLUGINS_CFLAGS}"
224
225archive_builtin
226
227#link vmlinux.o
228info LD vmlinux.o
229modpost_link vmlinux.o
230
231# modpost vmlinux.o to check for section mismatches
232${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
233
234kallsymso=""
235kallsyms_vmlinux=""
236if [ -n "${CONFIG_KALLSYMS}" ]; then
237
238 # kallsyms support
239 # Generate section listing all symbols and add it into vmlinux
240 # It's a three step process:
241 # 1) Link .tmp_vmlinux1 so it has all symbols and sections,
242 # but __kallsyms is empty.
243 # Running kallsyms on that gives us .tmp_kallsyms1.o with
244 # the right size
245 # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of
246 # the right size, but due to the added section, some
247 # addresses have shifted.
248 # From here, we generate a correct .tmp_kallsyms2.o
249 # 3) That link may have expanded the kernel image enough that
250 # more linker branch stubs / trampolines had to be added, which
251 # introduces new names, which further expands kallsyms. Do another
252 # pass if that is the case. In theory it's possible this results
253 # in even more stubs, but unlikely.
254 # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around
255 # other bugs.
256 # 4) The correct ${kallsymso} is linked into the final vmlinux.
257 #
258 # a) Verify that the System.map from vmlinux matches the map from
259 # ${kallsymso}.
260
261 kallsymso=.tmp_kallsyms2.o
262 kallsyms_vmlinux=.tmp_vmlinux2
263
264 # step 1
265 vmlinux_link "" .tmp_vmlinux1
266 kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
267
268 # step 2
269 vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2
270 kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
271
272 # step 3
273 size1=$(stat -c "%s" .tmp_kallsyms1.o)
274 size2=$(stat -c "%s" .tmp_kallsyms2.o)
275
276 if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
277 kallsymso=.tmp_kallsyms3.o
278 kallsyms_vmlinux=.tmp_vmlinux3
279
280 vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3
281
282 kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
283 fi
284fi
285
286info LD vmlinux
287vmlinux_link "${kallsymso}" vmlinux
288
289if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
290 info SORTEX vmlinux
291 sortextable vmlinux
292fi
293
294info SYSMAP System.map
295mksysmap vmlinux System.map
296
297# step a (see comment above)
298if [ -n "${CONFIG_KALLSYMS}" ]; then
299 mksysmap ${kallsyms_vmlinux} .tmp_System.map
300
301 if ! cmp -s System.map .tmp_System.map; then
302 echo >&2 Inconsistent kallsyms data
303 echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
304 exit 1
305 fi
306fi
307
308# We made a new kernel - delete old version file
309rm -f .old_version
1#!/bin/sh
2# SPDX-License-Identifier: GPL-2.0
3#
4# link vmlinux
5#
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.
11#
12# vmlinux
13# ^
14# |
15# +--< $(KBUILD_VMLINUX_OBJS)
16# | +--< init/built-in.a drivers/built-in.a mm/built-in.a + more
17# |
18# +--< $(KBUILD_VMLINUX_LIBS)
19# | +--< lib/lib.a + more
20# |
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
31set -e
32
33LD="$1"
34KBUILD_LDFLAGS="$2"
35LDFLAGS_vmlinux="$3"
36
37# Nice output in kbuild format
38# Will be supressed by "make -s"
39info()
40{
41 printf " %-7s %s\n" "${1}" "${2}"
42}
43
44# Generate a linker script to ensure correct ordering of initcalls.
45gen_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
55# If CONFIG_LTO_CLANG is selected, collect generated symbol versions into
56# .tmp_symversions.lds
57gen_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
69# Link of vmlinux.o used for section mismatch analysis
70# ${1} output file
71modpost_link()
72{
73 local objects
74 local lds=""
75
76 objects="--whole-archive \
77 ${KBUILD_VMLINUX_OBJS} \
78 --no-whole-archive \
79 --start-group \
80 ${KBUILD_VMLINUX_LIBS} \
81 --end-group"
82
83 if [ -n "${CONFIG_LTO_CLANG}" ]; then
84 gen_initcalls
85 lds="-T .tmp_initcalls.lds"
86
87 if [ -n "${CONFIG_MODVERSIONS}" ]; then
88 gen_symversions
89 lds="${lds} -T .tmp_symversions.lds"
90 fi
91
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
99 ${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${lds} ${objects}
100}
101
102objtool_link()
103{
104 local objtoolcmd;
105 local objtoolopt;
106
107 if [ "${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="${objtoolopt} --mcount"
118 fi
119 fi
120
121 if [ -n "${CONFIG_VMLINUX_VALIDATION}" ]; then
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"
130 if [ -z "${CONFIG_FRAME_POINTER}" ]; then
131 objtoolopt="${objtoolopt} --no-fp"
132 fi
133 if [ -n "${CONFIG_GCOV_KERNEL}" ] || [ -n "${CONFIG_LTO_CLANG}" ]; then
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}
143 tools/objtool/objtool ${objtoolcmd} ${objtoolopt} ${1}
144 fi
145}
146
147# Link of vmlinux
148# ${1} - output file
149# ${2}, ${3}, ... - optional extra .o files
150vmlinux_link()
151{
152 local lds="${objtree}/${KBUILD_LDS}"
153 local output=${1}
154 local objects
155 local strip_debug
156 local map_option
157
158 info LD ${output}
159
160 # skip output file argument
161 shift
162
163 # The kallsyms linking does not need debug symbols included.
164 if [ "$output" != "${output#.tmp_vmlinux.kallsyms}" ] ; then
165 strip_debug=-Wl,--strip-debug
166 fi
167
168 if [ -n "${CONFIG_VMLINUX_MAP}" ]; then
169 map_option="-Map=${output}.map"
170 fi
171
172 if [ "${SRCARCH}" != "um" ]; then
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
189
190 ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} \
191 ${strip_debug#-Wl,} \
192 -o ${output} \
193 ${map_option} \
194 -T ${lds} ${objects}
195 else
196 objects="-Wl,--whole-archive \
197 ${KBUILD_VMLINUX_OBJS} \
198 -Wl,--no-whole-archive \
199 -Wl,--start-group \
200 ${KBUILD_VMLINUX_LIBS} \
201 -Wl,--end-group \
202 ${@}"
203
204 ${CC} ${CFLAGS_vmlinux} \
205 ${strip_debug} \
206 -o ${output} \
207 ${map_option:+-Wl,${map_option}} \
208 -Wl,-T,${lds} \
209 ${objects} \
210 -lutil -lrt -lpthread
211 rm -f linux
212 fi
213}
214
215# generate .BTF typeinfo from DWARF debuginfo
216# ${1} - vmlinux image
217# ${2} - file to dump raw BTF data into
218gen_btf()
219{
220 local pahole_ver
221 local extra_paholeopt=
222
223 if ! [ -x "$(command -v ${PAHOLE})" ]; then
224 echo >&2 "BTF: ${1}: pahole (${PAHOLE}) is not available"
225 return 1
226 fi
227
228 pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/')
229 if [ "${pahole_ver}" -lt "116" ]; then
230 echo >&2 "BTF: ${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.16"
231 return 1
232 fi
233
234 vmlinux_link ${1}
235
236 if [ "${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
240 if [ "${pahole_ver}" -ge "121" ]; then
241 extra_paholeopt="${extra_paholeopt} --btf_gen_floats"
242 fi
243
244 info "BTF" ${2}
245 LLVM_OBJCOPY="${OBJCOPY}" ${PAHOLE} -J ${extra_paholeopt} ${1}
246
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
257}
258
259# Create ${2} .S file with all symbols from the ${1} object file
260kallsyms()
261{
262 local kallsymopt;
263
264 if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
265 kallsymopt="${kallsymopt} --all-symbols"
266 fi
267
268 if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then
269 kallsymopt="${kallsymopt} --absolute-percpu"
270 fi
271
272 if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then
273 kallsymopt="${kallsymopt} --base-relative"
274 fi
275
276 info KSYMS ${2}
277 ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${2}
278}
279
280# Perform one step in kallsyms generation, including temporary linking of
281# vmlinux.
282kallsyms_step()
283{
284 kallsymso_prev=${kallsymso}
285 kallsyms_vmlinux=.tmp_vmlinux.kallsyms${1}
286 kallsymso=${kallsyms_vmlinux}.o
287 kallsyms_S=${kallsyms_vmlinux}.S
288
289 vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o}
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}
296}
297
298# Create map file with all symbols from ${1}
299# See mksymap for additional details
300mksysmap()
301{
302 ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
303}
304
305sorttable()
306{
307 ${objtree}/scripts/sorttable ${1}
308}
309
310# Delete output files in case of error
311cleanup()
312{
313 rm -f .btf.*
314 rm -f .tmp_System.map
315 rm -f .tmp_initcalls.lds
316 rm -f .tmp_symversions.lds
317 rm -f .tmp_vmlinux*
318 rm -f System.map
319 rm -f vmlinux
320 rm -f vmlinux.map
321 rm -f vmlinux.o
322 rm -f .vmlinux.d
323}
324
325# Use "make V=1" to debug this script
326case "${KBUILD_VERBOSE}" in
327*1*)
328 set -x
329 ;;
330esac
331
332if [ "$1" = "clean" ]; then
333 cleanup
334 exit 0
335fi
336
337# We need access to CONFIG_ symbols
338. include/config/auto.conf
339
340# Update version
341info GEN .version
342if [ -r .version ]; then
343 VERSION=$(expr 0$(cat .version) + 1)
344 echo $VERSION > .version
345else
346 rm -f .version
347 echo 1 > .version
348fi;
349
350# final build of init/
351${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1
352
353#link vmlinux.o
354modpost_link vmlinux.o
355objtool_link vmlinux.o
356
357# modpost vmlinux.o to check for section mismatches
358${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1
359
360info MODINFO modules.builtin.modinfo
361${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo
362info GEN modules.builtin
363# The second line aids cases where multiple modules share the same object.
364tr '\0' '\n' < modules.builtin.modinfo | sed -n 's/^[[:alnum:]:_]*\.file=//p' |
365 tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$/.ko/' > modules.builtin
366
367btf_vmlinux_bin_o=""
368if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then
369 btf_vmlinux_bin_o=.btf.vmlinux.bin.o
370 if ! gen_btf .tmp_vmlinux.btf $btf_vmlinux_bin_o ; then
371 echo >&2 "Failed to generate BTF for vmlinux"
372 echo >&2 "Try to disable CONFIG_DEBUG_INFO_BTF"
373 exit 1
374 fi
375fi
376
377kallsymso=""
378kallsymso_prev=""
379kallsyms_vmlinux=""
380if [ -n "${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
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.
401 #
402 # a) Verify that the System.map from vmlinux matches the map from
403 # ${kallsymso}.
404
405 kallsyms_step 1
406 kallsyms_step 2
407
408 # step 3
409 size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso_prev})
410 size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso})
411
412 if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
413 kallsyms_step 3
414 fi
415fi
416
417vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o}
418
419# fill in BTF IDs
420if [ -n "${CONFIG_DEBUG_INFO_BTF}" -a -n "${CONFIG_BPF}" ]; then
421 info BTFIDS vmlinux
422 ${RESOLVE_BTFIDS} vmlinux
423fi
424
425if [ -n "${CONFIG_BUILDTIME_TABLE_SORT}" ]; then
426 info SORTTAB vmlinux
427 if ! sorttable vmlinux; then
428 echo >&2 Failed to sort kernel tables
429 exit 1
430 fi
431fi
432
433info SYSMAP System.map
434mksysmap vmlinux System.map
435
436# step a (see comment above)
437if [ -n "${CONFIG_KALLSYMS}" ]; then
438 mksysmap ${kallsyms_vmlinux} .tmp_System.map
439
440 if ! cmp -s System.map .tmp_System.map; then
441 echo >&2 Inconsistent kallsyms data
442 echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
443 exit 1
444 fi
445fi
446
447# For fixdep
448echo "vmlinux: $0" > .vmlinux.d