1 #!/bin/sh 1 #!/bin/sh
2 # SPDX-License-Identifier: GPL-2.0 2 # SPDX-License-Identifier: GPL-2.0
3 # 3 #
4 # link vmlinux 4 # link vmlinux
5 # 5 #
6 # vmlinux is linked from the objects in vmlinu !! 6 # vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_INIT) and
7 # vmlinux.a contains objects that are linked u !! 7 # $(KBUILD_VMLINUX_MAIN) and $(KBUILD_VMLINUX_LIBS). Most are built-in.a files
8 # $(KBUILD_VMLINUX_LIBS) are archives which ar !! 8 # from top-level directories in the kernel tree, others are specified in
9 # (not within --whole-archive), and do not req !! 9 # arch/$(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.
10 # 13 #
11 # vmlinux 14 # vmlinux
12 # ^ 15 # ^
13 # | 16 # |
14 # +--< vmlinux.a !! 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 # | 22 # |
16 # +--< $(KBUILD_VMLINUX_LIBS) 23 # +--< $(KBUILD_VMLINUX_LIBS)
17 # | +--< lib/lib.a + more 24 # | +--< lib/lib.a + more
18 # | 25 # |
19 # +-< ${kallsymso} (see description in KALLS 26 # +-< ${kallsymso} (see description in KALLSYMS section)
20 # 27 #
21 # vmlinux version (uname -v) cannot be updated 28 # vmlinux version (uname -v) cannot be updated during normal
22 # descending-into-subdirs phase since we do no 29 # descending-into-subdirs phase since we do not yet know if we need to
23 # update vmlinux. 30 # update vmlinux.
24 # Therefore this step is delayed until just be 31 # Therefore this step is delayed until just before final link of vmlinux.
25 # 32 #
26 # System.map is generated to document addresse 33 # System.map is generated to document addresses of all kernel symbols
27 34
28 # Error out on error 35 # Error out on error
29 set -e 36 set -e
30 37
31 LD="$1" <<
32 KBUILD_LDFLAGS="$2" <<
33 LDFLAGS_vmlinux="$3" <<
34 <<
35 is_enabled() { <<
36 grep -q "^$1=y" include/config/auto.co <<
37 } <<
38 <<
39 # Nice output in kbuild format 38 # Nice output in kbuild format
40 # Will be supressed by "make -s" 39 # Will be supressed by "make -s"
41 info() 40 info()
42 { 41 {
43 printf " %-7s %s\n" "${1}" "${2}" !! 42 if [ "${quiet}" != "silent_" ]; then
>> 43 printf " %-7s %s\n" ${1} ${2}
>> 44 fi
44 } 45 }
45 46
46 # Link of vmlinux !! 47 # Thin archive build here makes a final archive with symbol table and indexes
47 # ${1} - output file !! 48 # from vmlinux objects INIT and MAIN, which can be used as input to linker.
48 vmlinux_link() !! 49 # KBUILD_VMLINUX_LIBS archives should already have symbol table and indexes
>> 50 # added.
>> 51 #
>> 52 # Traditional incremental style of link does not require this step
>> 53 #
>> 54 # built-in.a output file
>> 55 #
>> 56 archive_builtin()
49 { 57 {
50 local output=${1} !! 58 info AR built-in.a
51 local objs !! 59 rm -f built-in.a;
52 local libs !! 60 ${AR} rcsTP${KBUILD_ARFLAGS} built-in.a \
53 local ld !! 61 ${KBUILD_VMLINUX_INIT} \
54 local ldflags !! 62 ${KBUILD_VMLINUX_MAIN}
55 local ldlibs !! 63 }
56 <<
57 info LD ${output} <<
58 <<
59 # skip output file argument <<
60 shift <<
61 <<
62 if is_enabled CONFIG_LTO_CLANG || is_e <<
63 # Use vmlinux.o instead of per <<
64 objs=vmlinux.o <<
65 libs= <<
66 else <<
67 objs=vmlinux.a <<
68 libs="${KBUILD_VMLINUX_LIBS}" <<
69 fi <<
70 <<
71 if is_enabled CONFIG_MODULES; then <<
72 objs="${objs} .vmlinux.export. <<
73 fi <<
74 <<
75 objs="${objs} init/version-timestamp.o <<
76 <<
77 if [ "${SRCARCH}" = "um" ]; then <<
78 wl=-Wl, <<
79 ld="${CC}" <<
80 ldflags="${CFLAGS_vmlinux}" <<
81 ldlibs="-lutil -lrt -lpthread" <<
82 else <<
83 wl= <<
84 ld="${LD}" <<
85 ldflags="${KBUILD_LDFLAGS} ${L <<
86 ldlibs= <<
87 fi <<
88 <<
89 ldflags="${ldflags} ${wl}--script=${ob <<
90 64
91 # The kallsyms linking does not need d !! 65 # Link of vmlinux.o used for section mismatch analysis
92 if [ -n "${strip_debug}" ] ; then !! 66 # ${1} output file
93 ldflags="${ldflags} ${wl}--str !! 67 modpost_link()
94 fi !! 68 {
>> 69 local objects
95 70
96 if is_enabled CONFIG_VMLINUX_MAP; then !! 71 objects="--whole-archive \
97 ldflags="${ldflags} ${wl}-Map= !! 72 built-in.a \
98 fi !! 73 --no-whole-archive \
>> 74 --start-group \
>> 75 ${KBUILD_VMLINUX_LIBS} \
>> 76 --end-group"
99 77
100 ${ld} ${ldflags} -o ${output} !! 78 ${LD} ${LDFLAGS} -r -o ${1} ${objects}
101 ${wl}--whole-archive ${objs} $ <<
102 ${wl}--start-group ${libs} ${w <<
103 ${kallsymso} ${btf_vmlinux_bin <<
104 } 79 }
105 80
106 # generate .BTF typeinfo from DWARF debuginfo !! 81 # Link of vmlinux
107 # ${1} - vmlinux image !! 82 # ${1} - optional extra .o files
108 gen_btf() !! 83 # ${2} - output file
>> 84 vmlinux_link()
109 { 85 {
110 local pahole_ver !! 86 local lds="${objtree}/${KBUILD_LDS}"
111 local btf_data=${1}.btf.o !! 87 local objects
112 88
113 if ! [ -x "$(command -v ${PAHOLE})" ]; !! 89 if [ "${SRCARCH}" != "um" ]; then
114 echo >&2 "BTF: ${1}: pahole ($ !! 90 objects="--whole-archive \
115 return 1 !! 91 built-in.a \
116 fi !! 92 --no-whole-archive \
>> 93 --start-group \
>> 94 ${KBUILD_VMLINUX_LIBS} \
>> 95 --end-group \
>> 96 ${1}"
117 97
118 pahole_ver=$(${PAHOLE} --version | sed !! 98 ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} \
119 if [ "${pahole_ver}" -lt "116" ]; then !! 99 -T ${lds} ${objects}
120 echo >&2 "BTF: ${1}: pahole ve <<
121 return 1 <<
122 fi <<
123 <<
124 info BTF "${btf_data}" <<
125 LLVM_OBJCOPY="${OBJCOPY}" ${PAHOLE} -J <<
126 <<
127 # Create ${btf_data} which contains ju <<
128 # SHF_ALLOC because .BTF will be part <<
129 # deletes all symbols including __star <<
130 # be redefined in the linker script. A <<
131 # objcopy warnings: "empty loadable se <<
132 ${OBJCOPY} --only-section=.BTF --set-s <<
133 --strip-all ${1} "${btf_data}" <<
134 # Change e_type to ET_REL so that it c <<
135 # GNU ld 2.35+ and lld do not allow an <<
136 if is_enabled CONFIG_CPU_BIG_ENDIAN; t <<
137 et_rel='\0\1' <<
138 else 100 else
139 et_rel='\1\0' !! 101 objects="-Wl,--whole-archive \
>> 102 built-in.a \
>> 103 -Wl,--no-whole-archive \
>> 104 -Wl,--start-group \
>> 105 ${KBUILD_VMLINUX_LIBS} \
>> 106 -Wl,--end-group \
>> 107 ${1}"
>> 108
>> 109 ${CC} ${CFLAGS_vmlinux} -o ${2} \
>> 110 -Wl,-T,${lds} \
>> 111 ${objects} \
>> 112 -lutil -lrt -lpthread
>> 113 rm -f linux
140 fi 114 fi
141 printf "${et_rel}" | dd of="${btf_data <<
142 <<
143 btf_vmlinux_bin_o=${btf_data} <<
144 } 115 }
145 116
146 # Create ${2}.o file with all symbols from the !! 117
>> 118 # Create ${2} .o file with all symbols from the ${1} object file
147 kallsyms() 119 kallsyms()
148 { 120 {
>> 121 info KSYM ${2}
149 local kallsymopt; 122 local kallsymopt;
150 123
151 if is_enabled CONFIG_KALLSYMS_ALL; the !! 124 if [ -n "${CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX}" ]; then
>> 125 kallsymopt="${kallsymopt} --symbol-prefix=_"
>> 126 fi
>> 127
>> 128 if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
152 kallsymopt="${kallsymopt} --al 129 kallsymopt="${kallsymopt} --all-symbols"
153 fi 130 fi
154 131
155 if is_enabled CONFIG_KALLSYMS_ABSOLUTE !! 132 if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then
156 kallsymopt="${kallsymopt} --ab 133 kallsymopt="${kallsymopt} --absolute-percpu"
157 fi 134 fi
158 135
159 info KSYMS "${2}.S" !! 136 if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then
160 scripts/kallsyms ${kallsymopt} "${1}" !! 137 kallsymopt="${kallsymopt} --base-relative"
>> 138 fi
161 139
162 info AS "${2}.o" !! 140 local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
163 ${CC} ${NOSTDINC_FLAGS} ${LINUXINCLUDE !! 141 ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
164 ${KBUILD_AFLAGS} ${KBUILD_AFLAGS <<
165 142
166 kallsymso=${2}.o !! 143 local afile="`basename ${2} .o`.S"
167 } <<
168 144
169 # Perform kallsyms for the given temporary vml !! 145 ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile}
170 sysmap_and_kallsyms() !! 146 ${CC} ${aflags} -c -o ${2} ${afile}
171 { <<
172 mksysmap "${1}" "${1}.syms" <<
173 kallsyms "${1}.syms" "${1}.kallsyms" <<
174 <<
175 kallsyms_sysmap=${1}.syms <<
176 } 147 }
177 148
178 # Create map file with all symbols from ${1} 149 # Create map file with all symbols from ${1}
179 # See mksymap for additional details 150 # See mksymap for additional details
180 mksysmap() 151 mksysmap()
181 { 152 {
182 info NM ${2} !! 153 ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
183 ${NM} -n "${1}" | sed -f "${srctree}/s <<
184 } 154 }
185 155
186 sorttable() !! 156 sortextable()
187 { 157 {
188 ${objtree}/scripts/sorttable ${1} !! 158 ${objtree}/scripts/sortextable ${1}
189 } 159 }
190 160
>> 161 # Delete output files in case of error
191 cleanup() 162 cleanup()
192 { 163 {
193 rm -f .btf.* !! 164 rm -f .tmp_System.map
>> 165 rm -f .tmp_kallsyms*
>> 166 rm -f .tmp_vmlinux*
>> 167 rm -f built-in.a
194 rm -f System.map 168 rm -f System.map
195 rm -f vmlinux 169 rm -f vmlinux
196 rm -f vmlinux.map !! 170 rm -f vmlinux.o
>> 171 }
>> 172
>> 173 on_exit()
>> 174 {
>> 175 if [ $? -ne 0 ]; then
>> 176 cleanup
>> 177 fi
>> 178 }
>> 179 trap on_exit EXIT
>> 180
>> 181 on_signals()
>> 182 {
>> 183 exit 1
197 } 184 }
>> 185 trap on_signals HUP INT QUIT TERM
198 186
>> 187 #
>> 188 #
199 # Use "make V=1" to debug this script 189 # Use "make V=1" to debug this script
200 case "${KBUILD_VERBOSE}" in 190 case "${KBUILD_VERBOSE}" in
201 *1*) 191 *1*)
202 set -x 192 set -x
203 ;; 193 ;;
204 esac 194 esac
205 195
206 if [ "$1" = "clean" ]; then 196 if [ "$1" = "clean" ]; then
207 cleanup 197 cleanup
208 exit 0 198 exit 0
209 fi 199 fi
210 200
211 ${MAKE} -f "${srctree}/scripts/Makefile.build" !! 201 # We need access to CONFIG_ symbols
212 !! 202 case "${KCONFIG_CONFIG}" in
213 btf_vmlinux_bin_o= !! 203 */*)
214 kallsymso= !! 204 . "${KCONFIG_CONFIG}"
215 strip_debug= !! 205 ;;
216 !! 206 *)
217 if is_enabled CONFIG_KALLSYMS; then !! 207 # Force using a file from the current directory
218 truncate -s0 .tmp_vmlinux.kallsyms0.sy !! 208 . "./${KCONFIG_CONFIG}"
219 kallsyms .tmp_vmlinux.kallsyms0.syms . !! 209 esac
220 fi <<
221 <<
222 if is_enabled CONFIG_KALLSYMS || is_enabled CO <<
223 <<
224 # The kallsyms linking does not need d <<
225 if ! is_enabled CONFIG_DEBUG_INFO_BTF; <<
226 strip_debug=1 <<
227 fi <<
228 <<
229 vmlinux_link .tmp_vmlinux1 <<
230 fi <<
231 <<
232 if is_enabled CONFIG_DEBUG_INFO_BTF; then <<
233 if ! gen_btf .tmp_vmlinux1; then <<
234 echo >&2 "Failed to generate B <<
235 echo >&2 "Try to disable CONFI <<
236 exit 1 <<
237 fi <<
238 fi <<
239 210
240 if is_enabled CONFIG_KALLSYMS; then !! 211 # Update version
>> 212 info GEN .version
>> 213 if [ -r .version ]; then
>> 214 VERSION=$(expr 0$(cat .version) + 1)
>> 215 echo $VERSION > .version
>> 216 else
>> 217 rm -f .version
>> 218 echo 1 > .version
>> 219 fi;
>> 220
>> 221 # final build of init/
>> 222 ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init
>> 223
>> 224 archive_builtin
>> 225
>> 226 #link vmlinux.o
>> 227 info LD vmlinux.o
>> 228 modpost_link vmlinux.o
>> 229
>> 230 # modpost vmlinux.o to check for section mismatches
>> 231 ${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
>> 232
>> 233 kallsymso=""
>> 234 kallsyms_vmlinux=""
>> 235 if [ -n "${CONFIG_KALLSYMS}" ]; then
241 236
242 # kallsyms support 237 # kallsyms support
243 # Generate section listing all symbols 238 # Generate section listing all symbols and add it into vmlinux
244 # It's a four step process: !! 239 # It's a three step process:
245 # 0) Generate a dummy __kallsyms with !! 240 # 1) Link .tmp_vmlinux1 so it has all symbols and sections,
246 # 1) Link .tmp_vmlinux.kallsyms1 so i !! 241 # but __kallsyms is empty.
247 # with a dummy __kallsyms. <<
248 # Running kallsyms on that gives u 242 # Running kallsyms on that gives us .tmp_kallsyms1.o with
249 # the right size 243 # the right size
250 # 2) Link .tmp_vmlinux.kallsyms2 so i !! 244 # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of
251 # the right size, but due to the a 245 # the right size, but due to the added section, some
252 # addresses have shifted. 246 # addresses have shifted.
253 # From here, we generate a correct !! 247 # From here, we generate a correct .tmp_kallsyms2.o
254 # 3) That link may have expanded the 248 # 3) That link may have expanded the kernel image enough that
255 # more linker branch stubs / tramp 249 # more linker branch stubs / trampolines had to be added, which
256 # introduces new names, which furt 250 # introduces new names, which further expands kallsyms. Do another
257 # pass if that is the case. In the 251 # pass if that is the case. In theory it's possible this results
258 # in even more stubs, but unlikely 252 # in even more stubs, but unlikely.
259 # KALLSYMS_EXTRA_PASS=1 may also u 253 # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around
260 # other bugs. 254 # other bugs.
261 # 4) The correct ${kallsymso} is link 255 # 4) The correct ${kallsymso} is linked into the final vmlinux.
262 # 256 #
263 # a) Verify that the System.map from 257 # a) Verify that the System.map from vmlinux matches the map from
264 # ${kallsymso}. 258 # ${kallsymso}.
265 259
266 # The kallsyms linking does not need d !! 260 kallsymso=.tmp_kallsyms2.o
267 strip_debug=1 !! 261 kallsyms_vmlinux=.tmp_vmlinux2
268 262
269 sysmap_and_kallsyms .tmp_vmlinux1 !! 263 # step 1
270 size1=$(${CONFIG_SHELL} "${srctree}/sc !! 264 vmlinux_link "" .tmp_vmlinux1
271 !! 265 kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
272 vmlinux_link .tmp_vmlinux2 !! 266
273 sysmap_and_kallsyms .tmp_vmlinux2 !! 267 # step 2
274 size2=$(${CONFIG_SHELL} "${srctree}/sc !! 268 vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2
>> 269 kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
>> 270
>> 271 # step 3
>> 272 size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms1.o)
>> 273 size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms2.o)
275 274
276 if [ $size1 -ne $size2 ] || [ -n "${KA 275 if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
277 vmlinux_link .tmp_vmlinux3 !! 276 kallsymso=.tmp_kallsyms3.o
278 sysmap_and_kallsyms .tmp_vmlin !! 277 kallsyms_vmlinux=.tmp_vmlinux3
>> 278
>> 279 vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3
>> 280
>> 281 kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
279 fi 282 fi
280 fi 283 fi
281 284
282 strip_debug= !! 285 info LD vmlinux
283 !! 286 vmlinux_link "${kallsymso}" vmlinux
284 vmlinux_link vmlinux <<
285 287
286 # fill in BTF IDs !! 288 if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
287 if is_enabled CONFIG_DEBUG_INFO_BTF && is_enab !! 289 info SORTEX vmlinux
288 info BTFIDS vmlinux !! 290 sortextable vmlinux
289 ${RESOLVE_BTFIDS} vmlinux <<
290 fi 291 fi
291 292
>> 293 info SYSMAP System.map
292 mksysmap vmlinux System.map 294 mksysmap vmlinux System.map
293 295
294 if is_enabled CONFIG_BUILDTIME_TABLE_SORT; the <<
295 info SORTTAB vmlinux <<
296 if ! sorttable vmlinux; then <<
297 echo >&2 Failed to sort kernel <<
298 exit 1 <<
299 fi <<
300 fi <<
301 <<
302 # step a (see comment above) 296 # step a (see comment above)
303 if is_enabled CONFIG_KALLSYMS; then !! 297 if [ -n "${CONFIG_KALLSYMS}" ]; then
304 if ! cmp -s System.map "${kallsyms_sys !! 298 mksysmap ${kallsyms_vmlinux} .tmp_System.map
>> 299
>> 300 if ! cmp -s System.map .tmp_System.map; then
305 echo >&2 Inconsistent kallsyms 301 echo >&2 Inconsistent kallsyms data
306 echo >&2 'Try "make KALLSYMS_E !! 302 echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
307 exit 1 303 exit 1
308 fi 304 fi
309 fi 305 fi
310 <<
311 # For fixdep <<
312 echo "vmlinux: $0" > .vmlinux.d <<
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