1 #!/bin/sh 1 #!/bin/sh
2 # SPDX-License-Identifier: GPL-2.0 <<
3 # 2 #
4 # link vmlinux 3 # link vmlinux
5 # 4 #
6 # vmlinux is linked from the objects in vmlinu !! 5 # vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_INIT) and
7 # vmlinux.a contains objects that are linked u !! 6 # $(KBUILD_VMLINUX_MAIN) and $(KBUILD_VMLINUX_LIBS). Most are built-in.o files
8 # $(KBUILD_VMLINUX_LIBS) are archives which ar !! 7 # from top-level directories in the kernel tree, others are specified in
9 # (not within --whole-archive), and do not req !! 8 # arch/$(ARCH)/Makefile. Ordering when linking is important, and
>> 9 # $(KBUILD_VMLINUX_INIT) must be first. $(KBUILD_VMLINUX_LIBS) are archives
>> 10 # which are linked conditionally (not within --whole-archive), and do not
>> 11 # require symbol indexes added.
10 # 12 #
11 # vmlinux 13 # vmlinux
12 # ^ 14 # ^
13 # | 15 # |
14 # +--< vmlinux.a !! 16 # +-< $(KBUILD_VMLINUX_INIT)
>> 17 # | +--< init/version.o + more
>> 18 # |
>> 19 # +--< $(KBUILD_VMLINUX_MAIN)
>> 20 # | +--< drivers/built-in.o mm/built-in.o + more
15 # | 21 # |
16 # +--< $(KBUILD_VMLINUX_LIBS) 22 # +--< $(KBUILD_VMLINUX_LIBS)
17 # | +--< lib/lib.a + more 23 # | +--< lib/lib.a + more
18 # | 24 # |
19 # +-< ${kallsymso} (see description in KALLS 25 # +-< ${kallsymso} (see description in KALLSYMS section)
20 # 26 #
21 # vmlinux version (uname -v) cannot be updated 27 # vmlinux version (uname -v) cannot be updated during normal
22 # descending-into-subdirs phase since we do no 28 # descending-into-subdirs phase since we do not yet know if we need to
23 # update vmlinux. 29 # update vmlinux.
24 # Therefore this step is delayed until just be 30 # Therefore this step is delayed until just before final link of vmlinux.
25 # 31 #
26 # System.map is generated to document addresse 32 # System.map is generated to document addresses of all kernel symbols
27 33
28 # Error out on error 34 # Error out on error
29 set -e 35 set -e
30 36
31 LD="$1" <<
32 KBUILD_LDFLAGS="$2" <<
33 LDFLAGS_vmlinux="$3" <<
34 <<
35 is_enabled() { <<
36 grep -q "^$1=y" include/config/auto.co <<
37 } <<
38 <<
39 # Nice output in kbuild format 37 # Nice output in kbuild format
40 # Will be supressed by "make -s" 38 # Will be supressed by "make -s"
41 info() 39 info()
42 { 40 {
43 printf " %-7s %s\n" "${1}" "${2}" !! 41 if [ "${quiet}" != "silent_" ]; then
>> 42 printf " %-7s %s\n" ${1} ${2}
>> 43 fi
44 } 44 }
45 45
46 # Link of vmlinux !! 46 # Thin archive build here makes a final archive with symbol table and indexes
47 # ${1} - output file !! 47 # from vmlinux objects INIT and MAIN, which can be used as input to linker.
48 vmlinux_link() !! 48 # KBUILD_VMLINUX_LIBS archives should already have symbol table and indexes
>> 49 # added.
>> 50 #
>> 51 # Traditional incremental style of link does not require this step
>> 52 #
>> 53 # built-in.o output file
>> 54 #
>> 55 archive_builtin()
49 { 56 {
50 local output=${1} !! 57 if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
51 local objs !! 58 info AR built-in.o
52 local libs !! 59 rm -f built-in.o;
53 local ld !! 60 ${AR} rcsTP${KBUILD_ARFLAGS} built-in.o \
54 local ldflags !! 61 ${KBUILD_VMLINUX_INIT} \
55 local ldlibs !! 62 ${KBUILD_VMLINUX_MAIN}
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="${objs} .vmlinux.export. <<
73 fi 63 fi
>> 64 }
74 65
75 objs="${objs} init/version-timestamp.o !! 66 # Link of vmlinux.o used for section mismatch analysis
>> 67 # ${1} output file
>> 68 modpost_link()
>> 69 {
>> 70 local objects
76 71
77 if [ "${SRCARCH}" = "um" ]; then !! 72 if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
78 wl=-Wl, !! 73 objects="--whole-archive \
79 ld="${CC}" !! 74 built-in.o \
80 ldflags="${CFLAGS_vmlinux}" !! 75 --no-whole-archive \
81 ldlibs="-lutil -lrt -lpthread" !! 76 --start-group \
>> 77 ${KBUILD_VMLINUX_LIBS} \
>> 78 --end-group"
82 else 79 else
83 wl= !! 80 objects="${KBUILD_VMLINUX_INIT} \
84 ld="${LD}" !! 81 --start-group \
85 ldflags="${KBUILD_LDFLAGS} ${L !! 82 ${KBUILD_VMLINUX_MAIN} \
86 ldlibs= !! 83 ${KBUILD_VMLINUX_LIBS} \
87 fi !! 84 --end-group"
88 <<
89 ldflags="${ldflags} ${wl}--script=${ob <<
90 <<
91 # The kallsyms linking does not need d <<
92 if [ -n "${strip_debug}" ] ; then <<
93 ldflags="${ldflags} ${wl}--str <<
94 fi <<
95 <<
96 if is_enabled CONFIG_VMLINUX_MAP; then <<
97 ldflags="${ldflags} ${wl}-Map= <<
98 fi 85 fi
99 !! 86 ${LD} ${LDFLAGS} -r -o ${1} ${objects}
100 ${ld} ${ldflags} -o ${output} <<
101 ${wl}--whole-archive ${objs} $ <<
102 ${wl}--start-group ${libs} ${w <<
103 ${kallsymso} ${btf_vmlinux_bin <<
104 } 87 }
105 88
106 # generate .BTF typeinfo from DWARF debuginfo !! 89 # Link of vmlinux
107 # ${1} - vmlinux image !! 90 # ${1} - optional extra .o files
108 gen_btf() !! 91 # ${2} - output file
>> 92 vmlinux_link()
109 { 93 {
110 local pahole_ver !! 94 local lds="${objtree}/${KBUILD_LDS}"
111 local btf_data=${1}.btf.o !! 95 local objects
>> 96
>> 97 if [ "${SRCARCH}" != "um" ]; then
>> 98 if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
>> 99 objects="--whole-archive \
>> 100 built-in.o \
>> 101 --no-whole-archive \
>> 102 --start-group \
>> 103 ${KBUILD_VMLINUX_LIBS} \
>> 104 --end-group \
>> 105 ${1}"
>> 106 else
>> 107 objects="${KBUILD_VMLINUX_INIT} \
>> 108 --start-group \
>> 109 ${KBUILD_VMLINUX_MAIN} \
>> 110 ${KBUILD_VMLINUX_LIBS} \
>> 111 --end-group \
>> 112 ${1}"
>> 113 fi
112 114
113 if ! [ -x "$(command -v ${PAHOLE})" ]; !! 115 ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} \
114 echo >&2 "BTF: ${1}: pahole ($ !! 116 -T ${lds} ${objects}
115 return 1 <<
116 fi <<
117 <<
118 pahole_ver=$(${PAHOLE} --version | sed <<
119 if [ "${pahole_ver}" -lt "116" ]; then <<
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 117 else
139 et_rel='\1\0' !! 118 if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
>> 119 objects="-Wl,--whole-archive \
>> 120 built-in.o \
>> 121 -Wl,--no-whole-archive \
>> 122 -Wl,--start-group \
>> 123 ${KBUILD_VMLINUX_LIBS} \
>> 124 -Wl,--end-group \
>> 125 ${1}"
>> 126 else
>> 127 objects="${KBUILD_VMLINUX_INIT} \
>> 128 -Wl,--start-group \
>> 129 ${KBUILD_VMLINUX_MAIN} \
>> 130 ${KBUILD_VMLINUX_LIBS} \
>> 131 -Wl,--end-group \
>> 132 ${1}"
>> 133 fi
>> 134
>> 135 ${CC} ${CFLAGS_vmlinux} -o ${2} \
>> 136 -Wl,-T,${lds} \
>> 137 ${objects} \
>> 138 -lutil -lrt -lpthread
>> 139 rm -f linux
140 fi 140 fi
141 printf "${et_rel}" | dd of="${btf_data <<
142 <<
143 btf_vmlinux_bin_o=${btf_data} <<
144 } 141 }
145 142
146 # Create ${2}.o file with all symbols from the !! 143
>> 144 # Create ${2} .o file with all symbols from the ${1} object file
147 kallsyms() 145 kallsyms()
148 { 146 {
>> 147 info KSYM ${2}
149 local kallsymopt; 148 local kallsymopt;
150 149
151 if is_enabled CONFIG_KALLSYMS_ALL; the !! 150 if [ -n "${CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX}" ]; then
>> 151 kallsymopt="${kallsymopt} --symbol-prefix=_"
>> 152 fi
>> 153
>> 154 if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
152 kallsymopt="${kallsymopt} --al 155 kallsymopt="${kallsymopt} --all-symbols"
153 fi 156 fi
154 157
155 if is_enabled CONFIG_KALLSYMS_ABSOLUTE !! 158 if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then
156 kallsymopt="${kallsymopt} --ab 159 kallsymopt="${kallsymopt} --absolute-percpu"
157 fi 160 fi
158 161
159 info KSYMS "${2}.S" !! 162 if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then
160 scripts/kallsyms ${kallsymopt} "${1}" !! 163 kallsymopt="${kallsymopt} --base-relative"
161 !! 164 fi
162 info AS "${2}.o" <<
163 ${CC} ${NOSTDINC_FLAGS} ${LINUXINCLUDE <<
164 ${KBUILD_AFLAGS} ${KBUILD_AFLAGS <<
165 165
166 kallsymso=${2}.o !! 166 local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
167 } !! 167 ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
168 168
169 # Perform kallsyms for the given temporary vml !! 169 local afile="`basename ${2} .o`.S"
170 sysmap_and_kallsyms() <<
171 { <<
172 mksysmap "${1}" "${1}.syms" <<
173 kallsyms "${1}.syms" "${1}.kallsyms" <<
174 170
175 kallsyms_sysmap=${1}.syms !! 171 ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile}
>> 172 ${CC} ${aflags} -c -o ${2} ${afile}
176 } 173 }
177 174
178 # Create map file with all symbols from ${1} 175 # Create map file with all symbols from ${1}
179 # See mksymap for additional details 176 # See mksymap for additional details
180 mksysmap() 177 mksysmap()
181 { 178 {
182 info NM ${2} !! 179 ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
183 ${NM} -n "${1}" | sed -f "${srctree}/s <<
184 } 180 }
185 181
186 sorttable() !! 182 sortextable()
187 { 183 {
188 ${objtree}/scripts/sorttable ${1} !! 184 ${objtree}/scripts/sortextable ${1}
189 } 185 }
190 186
>> 187 # Delete output files in case of error
191 cleanup() 188 cleanup()
192 { 189 {
193 rm -f .btf.* !! 190 rm -f .old_version
>> 191 rm -f .tmp_System.map
>> 192 rm -f .tmp_kallsyms*
>> 193 rm -f .tmp_version
>> 194 rm -f .tmp_vmlinux*
>> 195 rm -f built-in.o
194 rm -f System.map 196 rm -f System.map
195 rm -f vmlinux 197 rm -f vmlinux
196 rm -f vmlinux.map !! 198 rm -f vmlinux.o
197 } 199 }
198 200
>> 201 on_exit()
>> 202 {
>> 203 if [ $? -ne 0 ]; then
>> 204 cleanup
>> 205 fi
>> 206 }
>> 207 trap on_exit EXIT
>> 208
>> 209 on_signals()
>> 210 {
>> 211 exit 1
>> 212 }
>> 213 trap on_signals HUP INT QUIT TERM
>> 214
>> 215 #
>> 216 #
199 # Use "make V=1" to debug this script 217 # Use "make V=1" to debug this script
200 case "${KBUILD_VERBOSE}" in 218 case "${KBUILD_VERBOSE}" in
201 *1*) 219 *1*)
202 set -x 220 set -x
203 ;; 221 ;;
204 esac 222 esac
205 223
206 if [ "$1" = "clean" ]; then 224 if [ "$1" = "clean" ]; then
207 cleanup 225 cleanup
208 exit 0 226 exit 0
209 fi 227 fi
210 228
211 ${MAKE} -f "${srctree}/scripts/Makefile.build" !! 229 # We need access to CONFIG_ symbols
212 !! 230 case "${KCONFIG_CONFIG}" in
213 btf_vmlinux_bin_o= !! 231 */*)
214 kallsymso= !! 232 . "${KCONFIG_CONFIG}"
215 strip_debug= !! 233 ;;
216 !! 234 *)
217 if is_enabled CONFIG_KALLSYMS; then !! 235 # Force using a file from the current directory
218 truncate -s0 .tmp_vmlinux.kallsyms0.sy !! 236 . "./${KCONFIG_CONFIG}"
219 kallsyms .tmp_vmlinux.kallsyms0.syms . !! 237 esac
220 fi <<
221 <<
222 if is_enabled CONFIG_KALLSYMS || is_enabled CO <<
223 <<
224 # The kallsyms linking does not need d <<
225 if ! is_enabled CONFIG_DEBUG_INFO_BTF; <<
226 strip_debug=1 <<
227 fi <<
228 <<
229 vmlinux_link .tmp_vmlinux1 <<
230 fi <<
231 <<
232 if is_enabled CONFIG_DEBUG_INFO_BTF; then <<
233 if ! gen_btf .tmp_vmlinux1; then <<
234 echo >&2 "Failed to generate B <<
235 echo >&2 "Try to disable CONFI <<
236 exit 1 <<
237 fi <<
238 fi <<
239 238
240 if is_enabled CONFIG_KALLSYMS; then !! 239 # Update version
>> 240 info GEN .version
>> 241 if [ ! -r .version ]; then
>> 242 rm -f .version;
>> 243 echo 1 >.version;
>> 244 else
>> 245 mv .version .old_version;
>> 246 expr 0$(cat .old_version) + 1 >.version;
>> 247 fi;
>> 248
>> 249 # final build of init/
>> 250 ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init GCC_PLUGINS_CFLAGS="${GCC_PLUGINS_CFLAGS}"
>> 251
>> 252 archive_builtin
>> 253
>> 254 #link vmlinux.o
>> 255 info LD vmlinux.o
>> 256 modpost_link vmlinux.o
>> 257
>> 258 # modpost vmlinux.o to check for section mismatches
>> 259 ${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
>> 260
>> 261 kallsymso=""
>> 262 kallsyms_vmlinux=""
>> 263 if [ -n "${CONFIG_KALLSYMS}" ]; then
241 264
242 # kallsyms support 265 # kallsyms support
243 # Generate section listing all symbols 266 # Generate section listing all symbols and add it into vmlinux
244 # It's a four step process: !! 267 # It's a three step process:
245 # 0) Generate a dummy __kallsyms with !! 268 # 1) Link .tmp_vmlinux1 so it has all symbols and sections,
246 # 1) Link .tmp_vmlinux.kallsyms1 so i !! 269 # but __kallsyms is empty.
247 # with a dummy __kallsyms. <<
248 # Running kallsyms on that gives u 270 # Running kallsyms on that gives us .tmp_kallsyms1.o with
249 # the right size 271 # the right size
250 # 2) Link .tmp_vmlinux.kallsyms2 so i !! 272 # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of
251 # the right size, but due to the a 273 # the right size, but due to the added section, some
252 # addresses have shifted. 274 # addresses have shifted.
253 # From here, we generate a correct !! 275 # From here, we generate a correct .tmp_kallsyms2.o
254 # 3) That link may have expanded the 276 # 3) That link may have expanded the kernel image enough that
255 # more linker branch stubs / tramp 277 # more linker branch stubs / trampolines had to be added, which
256 # introduces new names, which furt 278 # introduces new names, which further expands kallsyms. Do another
257 # pass if that is the case. In the 279 # pass if that is the case. In theory it's possible this results
258 # in even more stubs, but unlikely 280 # in even more stubs, but unlikely.
259 # KALLSYMS_EXTRA_PASS=1 may also u 281 # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around
260 # other bugs. 282 # other bugs.
261 # 4) The correct ${kallsymso} is link 283 # 4) The correct ${kallsymso} is linked into the final vmlinux.
262 # 284 #
263 # a) Verify that the System.map from 285 # a) Verify that the System.map from vmlinux matches the map from
264 # ${kallsymso}. 286 # ${kallsymso}.
265 287
266 # The kallsyms linking does not need d !! 288 kallsymso=.tmp_kallsyms2.o
267 strip_debug=1 !! 289 kallsyms_vmlinux=.tmp_vmlinux2
268 290
269 sysmap_and_kallsyms .tmp_vmlinux1 !! 291 # step 1
270 size1=$(${CONFIG_SHELL} "${srctree}/sc !! 292 vmlinux_link "" .tmp_vmlinux1
271 !! 293 kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
272 vmlinux_link .tmp_vmlinux2 !! 294
273 sysmap_and_kallsyms .tmp_vmlinux2 !! 295 # step 2
274 size2=$(${CONFIG_SHELL} "${srctree}/sc !! 296 vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2
>> 297 kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
>> 298
>> 299 # step 3
>> 300 size1=$(stat -c "%s" .tmp_kallsyms1.o)
>> 301 size2=$(stat -c "%s" .tmp_kallsyms2.o)
275 302
276 if [ $size1 -ne $size2 ] || [ -n "${KA 303 if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
277 vmlinux_link .tmp_vmlinux3 !! 304 kallsymso=.tmp_kallsyms3.o
278 sysmap_and_kallsyms .tmp_vmlin !! 305 kallsyms_vmlinux=.tmp_vmlinux3
>> 306
>> 307 vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3
>> 308
>> 309 kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
279 fi 310 fi
280 fi 311 fi
281 312
282 strip_debug= !! 313 info LD vmlinux
283 !! 314 vmlinux_link "${kallsymso}" vmlinux
284 vmlinux_link vmlinux <<
285 315
286 # fill in BTF IDs !! 316 if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
287 if is_enabled CONFIG_DEBUG_INFO_BTF && is_enab !! 317 info SORTEX vmlinux
288 info BTFIDS vmlinux !! 318 sortextable vmlinux
289 ${RESOLVE_BTFIDS} vmlinux <<
290 fi 319 fi
291 320
>> 321 info SYSMAP System.map
292 mksysmap vmlinux System.map 322 mksysmap vmlinux System.map
293 323
294 if is_enabled CONFIG_BUILDTIME_TABLE_SORT; the <<
295 info SORTTAB vmlinux <<
296 if ! sorttable vmlinux; then <<
297 echo >&2 Failed to sort kernel <<
298 exit 1 <<
299 fi <<
300 fi <<
301 <<
302 # step a (see comment above) 324 # step a (see comment above)
303 if is_enabled CONFIG_KALLSYMS; then !! 325 if [ -n "${CONFIG_KALLSYMS}" ]; then
304 if ! cmp -s System.map "${kallsyms_sys !! 326 mksysmap ${kallsyms_vmlinux} .tmp_System.map
>> 327
>> 328 if ! cmp -s System.map .tmp_System.map; then
305 echo >&2 Inconsistent kallsyms 329 echo >&2 Inconsistent kallsyms data
306 echo >&2 'Try "make KALLSYMS_E !! 330 echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
307 exit 1 331 exit 1
308 fi 332 fi
309 fi 333 fi
310 334
311 # For fixdep !! 335 # We made a new kernel - delete old version file
312 echo "vmlinux: $0" > .vmlinux.d !! 336 rm -f .old_version
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