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2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da 
....@@ -3,22 +3,17 @@
33 #
44 # link vmlinux
55 #
6
-# vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_INIT) and
7
-# $(KBUILD_VMLINUX_MAIN) and $(KBUILD_VMLINUX_LIBS). Most are built-in.a files
8
-# from top-level directories in the kernel tree, others are specified in
9
-# arch/$(ARCH)/Makefile. Ordering when linking is important, and
10
-# $(KBUILD_VMLINUX_INIT) must be first. $(KBUILD_VMLINUX_LIBS) are archives
11
-# which are linked conditionally (not within --whole-archive), and do not
12
-# require symbol indexes added.
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.
1311 #
1412 # vmlinux
1513 #   ^
1614 #   |
17
-#   +-< $(KBUILD_VMLINUX_INIT)
18
-#   |   +--< init/version.o + more
19
-#   |
20
-#   +--< $(KBUILD_VMLINUX_MAIN)
21
-#   |    +--< drivers/built-in.a mm/built-in.a + more
15
+#   +--< $(KBUILD_VMLINUX_OBJS)
16
+#   |    +--< init/built-in.a drivers/built-in.a mm/built-in.a + more
2217 #   |
2318 #   +--< $(KBUILD_VMLINUX_LIBS)
2419 #   |    +--< lib/lib.a + more
....@@ -35,64 +30,42 @@
3530 # Error out on error
3631 set -e
3732 
33
+LD="$1"
34
+KBUILD_LDFLAGS="$2"
35
+LDFLAGS_vmlinux="$3"
36
+
3837 # Nice output in kbuild format
3938 # Will be supressed by "make -s"
4039 info()
4140 {
4241 	if [ "${quiet}" != "silent_" ]; then
43
-		printf "  %-7s %s\n" ${1} ${2}
42
+		printf "  %-7s %s\n" "${1}" "${2}"
4443 	fi
4544 }
4645 
47
-# Thin archive build here makes a final archive with symbol table and indexes
48
-# from vmlinux objects INIT and MAIN, which can be used as input to linker.
49
-# KBUILD_VMLINUX_LIBS archives should already have symbol table and indexes
50
-# added.
51
-#
52
-# Traditional incremental style of link does not require this step
53
-#
54
-# built-in.a output file
55
-#
56
-archive_builtin()
46
+# Generate a linker script to ensure correct ordering of initcalls.
47
+gen_initcalls()
5748 {
58
-	info AR built-in.a
59
-	rm -f built-in.a;
60
-	${AR} rcsTP${KBUILD_ARFLAGS} built-in.a			\
61
-				${KBUILD_VMLINUX_INIT}		\
62
-				${KBUILD_VMLINUX_MAIN}
49
+	info GEN .tmp_initcalls.lds
6350 
64
-	# rebuild with llvm-ar to update the symbol table
65
-	if [ -n "${CONFIG_LTO_CLANG}" ]; then
66
-		mv -f built-in.a built-in.a.tmp
67
-		${LLVM_AR} rcsT${KBUILD_ARFLAGS} built-in.a $(${AR} t built-in.a.tmp)
68
-		rm -f built-in.a.tmp
69
-	fi
51
+	${PYTHON} ${srctree}/scripts/jobserver-exec		\
52
+	${PERL} ${srctree}/scripts/generate_initcall_order.pl	\
53
+		${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS}	\
54
+		> .tmp_initcalls.lds
7055 }
7156 
72
-# If CONFIG_LTO_CLANG is selected, generate a linker script to ensure correct
73
-# ordering of initcalls, and with CONFIG_MODVERSIONS also enabled, collect the
74
-# previously generated symbol versions into the same script.
75
-lto_lds()
57
+# If CONFIG_LTO_CLANG is selected, collect generated symbol versions into
58
+# .tmp_symversions.lds
59
+gen_symversions()
7660 {
77
-	if [ -z "${CONFIG_LTO_CLANG}" ]; then
78
-		return
79
-	fi
61
+	info GEN .tmp_symversions.lds
62
+	rm -f .tmp_symversions.lds
8063 
81
-	${srctree}/scripts/generate_initcall_order.pl \
82
-		built-in.a ${KBUILD_VMLINUX_LIBS} \
83
-		> .tmp_lto.lds
84
-
85
-	if [ -n "${CONFIG_MODVERSIONS}" ]; then
86
-		for a in built-in.a ${KBUILD_VMLINUX_LIBS}; do
87
-			for o in $(${AR} t $a); do
88
-				if [ -f ${o}.symversions ]; then
89
-					cat ${o}.symversions >> .tmp_lto.lds
90
-				fi
91
-			done
92
-		done
93
-	fi
94
-
95
-	echo "-T .tmp_lto.lds"
64
+	for o in ${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS}; do
65
+		if [ -f ${o}.symversions ]; then
66
+			cat ${o}.symversions >> .tmp_symversions.lds
67
+		fi
68
+	done
9669 }
9770 
9871 # Link of vmlinux.o used for section mismatch analysis
....@@ -100,72 +73,139 @@
10073 modpost_link()
10174 {
10275 	local objects
76
+	local lds=""
10377 
10478 	objects="--whole-archive				\
105
-		built-in.a					\
79
+		${KBUILD_VMLINUX_OBJS}				\
10680 		--no-whole-archive				\
10781 		--start-group					\
10882 		${KBUILD_VMLINUX_LIBS}				\
10983 		--end-group"
11084 
11185 	if [ -n "${CONFIG_LTO_CLANG}" ]; then
86
+		gen_initcalls
87
+		lds="-T .tmp_initcalls.lds"
88
+
89
+		if [ -n "${CONFIG_MODVERSIONS}" ]; then
90
+			gen_symversions
91
+			lds="${lds} -T .tmp_symversions.lds"
92
+		fi
93
+
11294 		# This might take a while, so indicate that we're doing
11395 		# an LTO link
114
-		info LTO vmlinux.o
96
+		info LTO ${1}
97
+	else
98
+		info LD ${1}
11599 	fi
116100 
117
-	${LD} ${KBUILD_LDFLAGS} -r -o ${1} $(lto_lds) ${objects}
101
+	${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${lds} ${objects}
118102 }
119103 
120
-# If CONFIG_LTO_CLANG is selected, we postpone running recordmcount until
121
-# we have compiled LLVM IR to an object file.
122
-recordmcount()
104
+objtool_link()
123105 {
124
-	if [ -z "${CONFIG_LTO_CLANG}" ]; then
125
-		return
106
+	local objtoolcmd;
107
+	local objtoolopt;
108
+
109
+	if [ "${CONFIG_LTO_CLANG} ${CONFIG_STACK_VALIDATION}" = "y y" ]; then
110
+		# Don't perform vmlinux validation unless explicitly requested,
111
+		# but run objtool on vmlinux.o now that we have an object file.
112
+		if [ -n "${CONFIG_UNWINDER_ORC}" ]; then
113
+			objtoolcmd="orc generate"
114
+		fi
115
+
116
+		objtoolopt="${objtoolopt} --duplicate"
117
+
118
+		if [ -n "${CONFIG_FTRACE_MCOUNT_USE_OBJTOOL}" ]; then
119
+			objtoolopt="${objtoolopt} --mcount"
120
+		fi
126121 	fi
127122 
128
-	if [ -n "${CONFIG_FTRACE_MCOUNT_RECORD}" ]; then
129
-		scripts/recordmcount ${RECORDMCOUNT_FLAGS} $*
123
+	if [ -n "${CONFIG_VMLINUX_VALIDATION}" ]; then
124
+		objtoolopt="${objtoolopt} --noinstr"
125
+	fi
126
+
127
+	if [ -n "${objtoolopt}" ]; then
128
+		if [ -z "${objtoolcmd}" ]; then
129
+			objtoolcmd="check"
130
+		fi
131
+		objtoolopt="${objtoolopt} --vmlinux"
132
+		if [ -n "${CONFIG_CPU_UNRET_ENTRY}" ]; then
133
+			objtoolopt="${objtoolopt} --unret"
134
+		fi
135
+		if [ -z "${CONFIG_FRAME_POINTER}" ]; then
136
+			objtoolopt="${objtoolopt} --no-fp"
137
+		fi
138
+		if [ -n "${CONFIG_GCOV_KERNEL}" ] || [ -n "${CONFIG_LTO_CLANG}" ]; then
139
+			objtoolopt="${objtoolopt} --no-unreachable"
140
+		fi
141
+		if [ -n "${CONFIG_RETPOLINE}" ]; then
142
+			objtoolopt="${objtoolopt} --retpoline"
143
+		fi
144
+		if [ -n "${CONFIG_X86_SMAP}" ]; then
145
+			objtoolopt="${objtoolopt} --uaccess"
146
+		fi
147
+		if [ -n "${CONFIG_SLS}" ]; then
148
+			objtoolopt="${objtoolopt} --sls"
149
+		fi
150
+		info OBJTOOL ${1}
151
+		tools/objtool/objtool ${objtoolcmd} ${objtoolopt} ${1}
130152 	fi
131153 }
132154 
133155 # Link of vmlinux
134
-# ${1} - optional extra .o files
135
-# ${2} - output file
156
+# ${1} - output file
157
+# ${2}, ${3}, ... - optional extra .o files
136158 vmlinux_link()
137159 {
138160 	local lds="${objtree}/${KBUILD_LDS}"
161
+	local output=${1}
139162 	local objects
163
+	local strip_debug
164
+
165
+	info LD ${output}
166
+
167
+	# skip output file argument
168
+	shift
169
+
170
+	# The kallsyms linking does not need debug symbols included.
171
+	if [ "$output" != "${output#.tmp_vmlinux.kallsyms}" ] ; then
172
+		strip_debug=-Wl,--strip-debug
173
+	fi
140174 
141175 	if [ "${SRCARCH}" != "um" ]; then
142
-		if [ -z "${CONFIG_LTO_CLANG}" ]; then
176
+		if [ -n "${CONFIG_LTO_CLANG}" ]; then
177
+			# Use vmlinux.o instead of performing the slow LTO
178
+			# link again.
143179 			objects="--whole-archive		\
144
-				built-in.a			\
180
+				vmlinux.o 			\
181
+				--no-whole-archive		\
182
+				${@}"
183
+		else
184
+			objects="--whole-archive		\
185
+				${KBUILD_VMLINUX_OBJS}		\
145186 				--no-whole-archive		\
146187 				--start-group			\
147188 				${KBUILD_VMLINUX_LIBS}		\
148189 				--end-group			\
149
-				${1}"
150
-		else
151
-			objects="--start-group			\
152
-				vmlinux.o			\
153
-				--end-group			\
154
-				${1}"
190
+				${@}"
155191 		fi
156192 
157
-		${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} -o ${2}	\
193
+		${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux}	\
194
+			${strip_debug#-Wl,}			\
195
+			-o ${output}				\
158196 			-T ${lds} ${objects}
159197 	else
160198 		objects="-Wl,--whole-archive			\
161
-			built-in.a				\
199
+			${KBUILD_VMLINUX_OBJS}			\
162200 			-Wl,--no-whole-archive			\
163201 			-Wl,--start-group			\
164202 			${KBUILD_VMLINUX_LIBS}			\
165203 			-Wl,--end-group				\
166
-			${1}"
204
+			${@}"
167205 
168
-		${CC} ${CFLAGS_vmlinux} -o ${2}			\
206
+		${CC} ${CFLAGS_vmlinux}				\
207
+			${strip_debug}				\
208
+			-o ${output}				\
169209 			-Wl,-T,${lds}				\
170210 			${objects}				\
171211 			-lutil -lrt -lpthread
....@@ -173,10 +213,44 @@
173213 	fi
174214 }
175215 
176
-# Create ${2} .o file with all symbols from the ${1} object file
216
+# generate .BTF typeinfo from DWARF debuginfo
217
+# ${1} - vmlinux image
218
+# ${2} - file to dump raw BTF data into
219
+gen_btf()
220
+{
221
+	local pahole_ver
222
+
223
+	if ! [ -x "$(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
+	info "BTF" ${2}
237
+	LLVM_OBJCOPY="${OBJCOPY}" ${PAHOLE} -J ${PAHOLE_FLAGS} ${1}
238
+
239
+	# Create ${2} which contains just .BTF section but no symbols. Add
240
+	# SHF_ALLOC because .BTF will be part of the vmlinux image. --strip-all
241
+	# deletes all symbols including __start_BTF and __stop_BTF, which will
242
+	# be redefined in the linker script. Add 2>/dev/null to suppress GNU
243
+	# objcopy warnings: "empty loadable segment detected at ..."
244
+	${OBJCOPY} --only-section=.BTF --set-section-flags .BTF=alloc,readonly \
245
+		--strip-all ${1} ${2} 2>/dev/null
246
+	# Change e_type to ET_REL so that it can be used to link final vmlinux.
247
+	# Unlike GNU ld, lld does not allow an ET_EXEC input.
248
+	printf '\1' | dd of=${2} conv=notrunc bs=1 seek=16 status=none
249
+}
250
+
251
+# Create ${2} .S file with all symbols from the ${1} object file
177252 kallsyms()
178253 {
179
-	info KSYM ${2}
180254 	local kallsymopt;
181255 
182256 	if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
....@@ -191,13 +265,34 @@
191265 		kallsymopt="${kallsymopt} --base-relative"
192266 	fi
193267 
194
-	local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL}               \
195
-		      ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
268
+	info KSYMS ${2}
196269 
197
-	local afile="`basename ${2} .o`.S"
270
+	if [ -n "${CONFIG_CFI_CLANG}" ]; then
271
+		${PERL} ${srctree}/scripts/generate_cfi_kallsyms.pl ${1} | \
272
+			sort -n > .tmp_kallsyms
273
+	else
274
+		${NM} -n ${1} > .tmp_kallsyms
275
+	fi
198276 
199
-	${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile}
200
-	${CC} ${aflags} -c -o ${2} ${afile}
277
+	scripts/kallsyms ${kallsymopt} < .tmp_kallsyms > ${2}
278
+}
279
+
280
+# Perform one step in kallsyms generation, including temporary linking of
281
+# vmlinux.
282
+kallsyms_step()
283
+{
284
+	kallsymso_prev=${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}
201296 }
202297 
203298 # Create map file with all symbols from ${1}
....@@ -207,19 +302,20 @@
207302 	${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
208303 }
209304 
210
-sortextable()
305
+sorttable()
211306 {
212
-	${objtree}/scripts/sortextable ${1}
307
+	${objtree}/scripts/sorttable ${1}
213308 }
214309 
215310 # Delete output files in case of error
216311 cleanup()
217312 {
313
+	rm -f .btf.*
218314 	rm -f .tmp_System.map
219
-	rm -f .tmp_kallsyms*
220
-	rm -f .tmp_lto.lds
315
+	rm -f .tmp_kallsyms
316
+	rm -f .tmp_initcalls.lds
317
+	rm -f .tmp_symversions.lds
221318 	rm -f .tmp_vmlinux*
222
-	rm -f built-in.a
223319 	rm -f System.map
224320 	rm -f vmlinux
225321 	rm -f vmlinux.o
....@@ -239,8 +335,6 @@
239335 }
240336 trap on_signals HUP INT QUIT TERM
241337 
242
-#
243
-#
244338 # Use "make V=1" to debug this script
245339 case "${KBUILD_VERBOSE}" in
246340 *1*)
....@@ -267,22 +361,34 @@
267361 fi;
268362 
269363 # final build of init/
270
-${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init
271
-
272
-archive_builtin
364
+${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1
273365 
274366 #link vmlinux.o
275367 modpost_link vmlinux.o
368
+objtool_link vmlinux.o
276369 
277370 # modpost vmlinux.o to check for section mismatches
278
-${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
371
+${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1
279372 
280
-if [ -n "${CONFIG_LTO_CLANG}" ]; then
281
-	# Call recordmcount if needed
282
-	recordmcount vmlinux.o
373
+info MODINFO modules.builtin.modinfo
374
+${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo
375
+info GEN modules.builtin
376
+# The second line aids cases where multiple modules share the same object.
377
+tr '\0' '\n' < modules.builtin.modinfo | sed -n 's/^[[:alnum:]:_]*\.file=//p' |
378
+	tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$/.ko/' > modules.builtin
379
+
380
+btf_vmlinux_bin_o=""
381
+if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then
382
+	btf_vmlinux_bin_o=.btf.vmlinux.bin.o
383
+	if ! gen_btf .tmp_vmlinux.btf $btf_vmlinux_bin_o ; then
384
+		echo >&2 "Failed to generate BTF for vmlinux"
385
+		echo >&2 "Try to disable CONFIG_DEBUG_INFO_BTF"
386
+		exit 1
387
+	fi
283388 fi
284389 
285390 kallsymso=""
391
+kallsymso_prev=""
286392 kallsyms_vmlinux=""
287393 if [ -n "${CONFIG_KALLSYMS}" ]; then
288394 
....@@ -309,37 +415,32 @@
309415 	# a)  Verify that the System.map from vmlinux matches the map from
310416 	#     ${kallsymso}.
311417 
312
-	kallsymso=.tmp_kallsyms2.o
313
-	kallsyms_vmlinux=.tmp_vmlinux2
314
-
315
-	# step 1
316
-	vmlinux_link "" .tmp_vmlinux1
317
-	kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
318
-
319
-	# step 2
320
-	vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2
321
-	kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
418
+	kallsyms_step 1
419
+	kallsyms_step 2
322420 
323421 	# step 3
324
-	size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms1.o)
325
-	size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms2.o)
422
+	size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso_prev})
423
+	size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso})
326424 
327425 	if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
328
-		kallsymso=.tmp_kallsyms3.o
329
-		kallsyms_vmlinux=.tmp_vmlinux3
330
-
331
-		vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3
332
-
333
-		kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
426
+		kallsyms_step 3
334427 	fi
335428 fi
336429 
337
-info LD vmlinux
338
-vmlinux_link "${kallsymso}" vmlinux
430
+vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o}
339431 
340
-if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
341
-	info SORTEX vmlinux
342
-	sortextable vmlinux
432
+# fill in BTF IDs
433
+if [ -n "${CONFIG_DEBUG_INFO_BTF}" -a -n "${CONFIG_BPF}" ]; then
434
+	info BTFIDS vmlinux
435
+	${RESOLVE_BTFIDS} vmlinux
436
+fi
437
+
438
+if [ -n "${CONFIG_BUILDTIME_TABLE_SORT}" ]; then
439
+	info SORTTAB vmlinux
440
+	if ! sorttable vmlinux; then
441
+		echo >&2 Failed to sort kernel tables
442
+		exit 1
443
+	fi
343444 fi
344445 
345446 info SYSMAP System.map