1#!/bin/sh
  2# SPDX-License-Identifier: GPL-2.0
  3#
  4# link vmlinux
  5#
  6# vmlinux is linked from the objects in vmlinux.a and $(KBUILD_VMLINUX_LIBS).
  7# vmlinux.a contains objects that are linked unconditionally.
 
  8# $(KBUILD_VMLINUX_LIBS) are archives which are linked conditionally
  9# (not within --whole-archive), and do not require symbol indexes added.
 10#
 11# vmlinux
 12#   ^
 13#   |
 14#   +--< vmlinux.a
 
 15#   |
 16#   +--< $(KBUILD_VMLINUX_LIBS)
 17#   |    +--< lib/lib.a + 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
 31LD="$1"
 32KBUILD_LDFLAGS="$2"
 33LDFLAGS_vmlinux="$3"
 34
 35is_enabled() {
 36	grep -q "^$1=y" include/config/auto.conf
 37}
 38
 39# Nice output in kbuild format
 40# Will be supressed by "make -s"
 41info()
 42{
 43	printf "  %-7s %s\n" "${1}" "${2}"
 44}
 45
 46# Link of vmlinux
 47# ${1} - output file
 48vmlinux_link()
 49{
 50	local output=${1}
 51	local objs
 52	local libs
 53	local ld
 54	local ldflags
 55	local ldlibs
 56
 57	info LD ${output}
 
 
 
 
 58
 59	# skip output file argument
 60	shift
 
 
 
 
 
 
 
 
 
 
 
 61
 62	if is_enabled CONFIG_LTO_CLANG || is_enabled CONFIG_X86_KERNEL_IBT; then
 63		# Use vmlinux.o instead of performing the slow LTO link again.
 64		objs=vmlinux.o
 65		libs=
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 66	else
 67		objs=vmlinux.a
 68		libs="${KBUILD_VMLINUX_LIBS}"
 69	fi
 70
 71	if is_enabled CONFIG_GENERIC_BUILTIN_DTB; then
 72		objs="${objs} .builtin-dtbs.o"
 73	fi
 74
 75	if is_enabled CONFIG_MODULES; then
 76		objs="${objs} .vmlinux.export.o"
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 77	fi
 
 78
 79	objs="${objs} init/version-timestamp.o"
 
 
 
 
 
 
 
 
 
 80
 81	if [ "${SRCARCH}" = "um" ]; then
 82		wl=-Wl,
 83		ld="${CC}"
 84		ldflags="${CFLAGS_vmlinux}"
 85		ldlibs="-lutil -lrt -lpthread"
 86	else
 87		wl=
 88		ld="${LD}"
 89		ldflags="${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux}"
 90		ldlibs=
 91	fi
 92
 93	ldflags="${ldflags} ${wl}--script=${objtree}/${KBUILD_LDS}"
 
 94
 95	# The kallsyms linking does not need debug symbols included.
 96	if [ -n "${strip_debug}" ] ; then
 97		ldflags="${ldflags} ${wl}--strip-debug"
 98	fi
 99
100	if is_enabled CONFIG_VMLINUX_MAP; then
101		ldflags="${ldflags} ${wl}-Map=${output}.map"
102	fi
103
104	${ld} ${ldflags} -o ${output}					\
105		${wl}--whole-archive ${objs} ${wl}--no-whole-archive	\
106		${wl}--start-group ${libs} ${wl}--end-group		\
107		${kallsymso} ${btf_vmlinux_bin_o} ${arch_vmlinux_o} ${ldlibs}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
108}
109
110# generate .BTF typeinfo from DWARF debuginfo
111# ${1} - vmlinux image
 
112gen_btf()
113{
114	local btf_data=${1}.btf.o
 
115
116	info BTF "${btf_data}"
117	LLVM_OBJCOPY="${OBJCOPY}" ${PAHOLE} -J ${PAHOLE_FLAGS} ${1}
 
 
118
119	# Create ${btf_data} which contains just .BTF section but no symbols. Add
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
120	# SHF_ALLOC because .BTF will be part of the vmlinux image. --strip-all
121	# deletes all symbols including __start_BTF and __stop_BTF, which will
122	# be redefined in the linker script. Add 2>/dev/null to suppress GNU
123	# objcopy warnings: "empty loadable segment detected at ..."
124	${OBJCOPY} --only-section=.BTF --set-section-flags .BTF=alloc,readonly \
125		--strip-all ${1} "${btf_data}" 2>/dev/null
126	# Change e_type to ET_REL so that it can be used to link final vmlinux.
127	# GNU ld 2.35+ and lld do not allow an ET_EXEC input.
128	if is_enabled CONFIG_CPU_BIG_ENDIAN; then
129		et_rel='\0\1'
130	else
131		et_rel='\1\0'
132	fi
133	printf "${et_rel}" | dd of="${btf_data}" conv=notrunc bs=1 seek=16 status=none
134
135	btf_vmlinux_bin_o=${btf_data}
136}
137
138# Create ${2}.o file with all symbols from the ${1} object file
139kallsyms()
140{
141	local kallsymopt;
142
143	if is_enabled CONFIG_KALLSYMS_ALL; then
144		kallsymopt="${kallsymopt} --all-symbols"
145	fi
146
147	if is_enabled CONFIG_KALLSYMS_ABSOLUTE_PERCPU; then
148		kallsymopt="${kallsymopt} --absolute-percpu"
149	fi
150
151	info KSYMS "${2}.S"
152	scripts/kallsyms ${kallsymopt} "${1}" > "${2}.S"
153
154	info AS "${2}.o"
155	${CC} ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS} \
156	      ${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} -c -o "${2}.o" "${2}.S"
157
158	kallsymso=${2}.o
 
159}
160
161# Perform kallsyms for the given temporary vmlinux.
162sysmap_and_kallsyms()
 
163{
164	mksysmap "${1}" "${1}.syms"
165	kallsyms "${1}.syms" "${1}.kallsyms"
 
 
 
 
 
166
167	kallsyms_sysmap=${1}.syms
 
 
 
168}
169
170# Create map file with all symbols from ${1}
171# See mksymap for additional details
172mksysmap()
173{
174	info NM ${2}
175	${NM} -n "${1}" | sed -f "${srctree}/scripts/mksysmap" > "${2}"
176}
177
178sorttable()
179{
180	${objtree}/scripts/sorttable ${1}
181}
182
 
183cleanup()
184{
185	rm -f .btf.*
 
 
 
 
186	rm -f System.map
187	rm -f vmlinux
188	rm -f vmlinux.map
 
 
189}
190
191# Use "make V=1" to debug this script
192case "${KBUILD_VERBOSE}" in
193*1*)
194	set -x
195	;;
196esac
197
198if [ "$1" = "clean" ]; then
199	cleanup
200	exit 0
201fi
202
203${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init init/version-timestamp.o
204
205arch_vmlinux_o=
206if is_enabled CONFIG_ARCH_WANTS_PRE_LINK_VMLINUX; then
207	arch_vmlinux_o=arch/${SRCARCH}/tools/vmlinux.arch.o
208fi
209
210btf_vmlinux_bin_o=
211kallsymso=
212strip_debug=
213
214if is_enabled CONFIG_KALLSYMS; then
215	true > .tmp_vmlinux0.syms
216	kallsyms .tmp_vmlinux0.syms .tmp_vmlinux0.kallsyms
217fi
218
219if is_enabled CONFIG_KALLSYMS || is_enabled CONFIG_DEBUG_INFO_BTF; then
220
221	# The kallsyms linking does not need debug symbols, but the BTF does.
222	if ! is_enabled CONFIG_DEBUG_INFO_BTF; then
223		strip_debug=1
224	fi
225
226	vmlinux_link .tmp_vmlinux1
227fi
228
229if is_enabled CONFIG_DEBUG_INFO_BTF; then
230	if ! gen_btf .tmp_vmlinux1; then
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
231		echo >&2 "Failed to generate BTF for vmlinux"
232		echo >&2 "Try to disable CONFIG_DEBUG_INFO_BTF"
233		exit 1
234	fi
235fi
236
237if is_enabled CONFIG_KALLSYMS; then
 
 
 
238
239	# kallsyms support
240	# Generate section listing all symbols and add it into vmlinux
241	# It's a four step process:
242	# 0)  Generate a dummy __kallsyms with empty symbol list.
243	# 1)  Link .tmp_vmlinux1.kallsyms so it has all symbols and sections,
244	#     with a dummy __kallsyms.
245	#     Running kallsyms on that gives us .tmp_vmlinux1.kallsyms.o with
246	#     the right size
247	# 2)  Link .tmp_vmlinux2.kallsyms so it now has a __kallsyms section of
248	#     the right size, but due to the added section, some
249	#     addresses have shifted.
250	#     From here, we generate a correct .tmp_vmlinux2.kallsyms.o
251	# 3)  That link may have expanded the kernel image enough that
252	#     more linker branch stubs / trampolines had to be added, which
253	#     introduces new names, which further expands kallsyms. Do another
254	#     pass if that is the case. In theory it's possible this results
255	#     in even more stubs, but unlikely.
256	#     KALLSYMS_EXTRA_PASS=1 may also used to debug or work around
257	#     other bugs.
258	# 4)  The correct ${kallsymso} is linked into the final vmlinux.
259	#
260	# a)  Verify that the System.map from vmlinux matches the map from
261	#     ${kallsymso}.
262
263	# The kallsyms linking does not need debug symbols included.
264	strip_debug=1
265
266	sysmap_and_kallsyms .tmp_vmlinux1
267	size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso})
268
269	vmlinux_link .tmp_vmlinux2
270	sysmap_and_kallsyms .tmp_vmlinux2
271	size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso})
272
273	if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
274		vmlinux_link .tmp_vmlinux3
275		sysmap_and_kallsyms .tmp_vmlinux3
276	fi
277fi
278
279strip_debug=
280
281vmlinux_link vmlinux
282
283# fill in BTF IDs
284if is_enabled CONFIG_DEBUG_INFO_BTF; then
285	info BTFIDS vmlinux
286	${RESOLVE_BTFIDS} vmlinux
287fi
288
289mksysmap vmlinux System.map
290
291if is_enabled CONFIG_BUILDTIME_TABLE_SORT; then
292	info SORTTAB vmlinux
293	if ! sorttable vmlinux; then
294		echo >&2 Failed to sort kernel tables
295		exit 1
296	fi
297fi
298
 
 
 
299# step a (see comment above)
300if is_enabled CONFIG_KALLSYMS; then
301	if ! cmp -s System.map "${kallsyms_sysmap}"; 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# For fixdep
309echo "vmlinux: $0" > .vmlinux.d

  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