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_OBJS) and
7 # vmlinux.a contains objects that are linked u !! 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.
8 # $(KBUILD_VMLINUX_LIBS) are archives which ar 9 # $(KBUILD_VMLINUX_LIBS) are archives which are linked conditionally
9 # (not within --whole-archive), and do not req 10 # (not within --whole-archive), and do not require symbol indexes added.
10 # 11 #
11 # vmlinux 12 # vmlinux
12 # ^ 13 # ^
13 # | 14 # |
14 # +--< vmlinux.a !! 15 # +--< $(KBUILD_VMLINUX_OBJS)
>> 16 # | +--< init/built-in.a drivers/built-in.a mm/built-in.a + more
15 # | 17 # |
16 # +--< $(KBUILD_VMLINUX_LIBS) 18 # +--< $(KBUILD_VMLINUX_LIBS)
17 # | +--< lib/lib.a + more 19 # | +--< lib/lib.a + more
18 # | 20 # |
19 # +-< ${kallsymso} (see description in KALLS 21 # +-< ${kallsymso} (see description in KALLSYMS section)
20 # 22 #
21 # vmlinux version (uname -v) cannot be updated 23 # vmlinux version (uname -v) cannot be updated during normal
22 # descending-into-subdirs phase since we do no 24 # descending-into-subdirs phase since we do not yet know if we need to
23 # update vmlinux. 25 # update vmlinux.
24 # Therefore this step is delayed until just be 26 # Therefore this step is delayed until just before final link of vmlinux.
25 # 27 #
26 # System.map is generated to document addresse 28 # System.map is generated to document addresses of all kernel symbols
27 29
28 # Error out on error 30 # Error out on error
29 set -e 31 set -e
30 32
31 LD="$1" <<
32 KBUILD_LDFLAGS="$2" <<
33 LDFLAGS_vmlinux="$3" <<
34 <<
35 is_enabled() { <<
36 grep -q "^$1=y" include/config/auto.co <<
37 } <<
38 <<
39 # Nice output in kbuild format 33 # Nice output in kbuild format
40 # Will be supressed by "make -s" 34 # Will be supressed by "make -s"
41 info() 35 info()
42 { 36 {
43 printf " %-7s %s\n" "${1}" "${2}" !! 37 if [ "${quiet}" != "silent_" ]; then
>> 38 printf " %-7s %s\n" "${1}" "${2}"
>> 39 fi
44 } 40 }
45 41
46 # Link of vmlinux !! 42 # Link of vmlinux.o used for section mismatch analysis
47 # ${1} - output file !! 43 # ${1} output file
48 vmlinux_link() !! 44 modpost_link()
49 { 45 {
50 local output=${1} !! 46 local objects
51 local objs <<
52 local libs <<
53 local ld <<
54 local ldflags <<
55 local ldlibs <<
56 <<
57 info LD ${output} <<
58 <<
59 # skip output file argument <<
60 shift <<
61 <<
62 if is_enabled CONFIG_LTO_CLANG || is_e <<
63 # Use vmlinux.o instead of per <<
64 objs=vmlinux.o <<
65 libs= <<
66 else <<
67 objs=vmlinux.a <<
68 libs="${KBUILD_VMLINUX_LIBS}" <<
69 fi <<
70 47
71 if is_enabled CONFIG_MODULES; then !! 48 objects="--whole-archive \
72 objs="${objs} .vmlinux.export. !! 49 ${KBUILD_VMLINUX_OBJS} \
73 fi !! 50 --no-whole-archive \
74 !! 51 --start-group \
75 objs="${objs} init/version-timestamp.o !! 52 ${KBUILD_VMLINUX_LIBS} \
>> 53 --end-group"
76 54
77 if [ "${SRCARCH}" = "um" ]; then !! 55 ${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${objects}
78 wl=-Wl, !! 56 }
79 ld="${CC}" <<
80 ldflags="${CFLAGS_vmlinux}" <<
81 ldlibs="-lutil -lrt -lpthread" <<
82 else <<
83 wl= <<
84 ld="${LD}" <<
85 ldflags="${KBUILD_LDFLAGS} ${L <<
86 ldlibs= <<
87 fi <<
88 57
89 ldflags="${ldflags} ${wl}--script=${ob !! 58 # Link of vmlinux
>> 59 # ${1} - optional extra .o files
>> 60 # ${2} - output file
>> 61 vmlinux_link()
>> 62 {
>> 63 local lds="${objtree}/${KBUILD_LDS}"
>> 64 local objects
90 65
91 # The kallsyms linking does not need d !! 66 if [ "${SRCARCH}" != "um" ]; then
92 if [ -n "${strip_debug}" ] ; then !! 67 objects="--whole-archive \
93 ldflags="${ldflags} ${wl}--str !! 68 ${KBUILD_VMLINUX_OBJS} \
94 fi !! 69 --no-whole-archive \
>> 70 --start-group \
>> 71 ${KBUILD_VMLINUX_LIBS} \
>> 72 --end-group \
>> 73 ${1}"
95 74
96 if is_enabled CONFIG_VMLINUX_MAP; then !! 75 ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} \
97 ldflags="${ldflags} ${wl}-Map= !! 76 -T ${lds} ${objects}
>> 77 else
>> 78 objects="-Wl,--whole-archive \
>> 79 ${KBUILD_VMLINUX_OBJS} \
>> 80 -Wl,--no-whole-archive \
>> 81 -Wl,--start-group \
>> 82 ${KBUILD_VMLINUX_LIBS} \
>> 83 -Wl,--end-group \
>> 84 ${1}"
>> 85
>> 86 ${CC} ${CFLAGS_vmlinux} -o ${2} \
>> 87 -Wl,-T,${lds} \
>> 88 ${objects} \
>> 89 -lutil -lrt -lpthread
>> 90 rm -f linux
98 fi 91 fi
99 <<
100 ${ld} ${ldflags} -o ${output} <<
101 ${wl}--whole-archive ${objs} $ <<
102 ${wl}--start-group ${libs} ${w <<
103 ${kallsymso} ${btf_vmlinux_bin <<
104 } 92 }
105 93
106 # generate .BTF typeinfo from DWARF debuginfo 94 # generate .BTF typeinfo from DWARF debuginfo
107 # ${1} - vmlinux image <<
108 gen_btf() 95 gen_btf()
109 { 96 {
110 local pahole_ver !! 97 local pahole_ver;
111 local btf_data=${1}.btf.o <<
112 98
113 if ! [ -x "$(command -v ${PAHOLE})" ]; 99 if ! [ -x "$(command -v ${PAHOLE})" ]; then
114 echo >&2 "BTF: ${1}: pahole ($ !! 100 info "BTF" "${1}: pahole (${PAHOLE}) is not available"
115 return 1 !! 101 return 0
116 fi 102 fi
117 103
118 pahole_ver=$(${PAHOLE} --version | sed 104 pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/')
119 if [ "${pahole_ver}" -lt "116" ]; then !! 105 if [ "${pahole_ver}" -lt "113" ]; then
120 echo >&2 "BTF: ${1}: pahole ve !! 106 info "BTF" "${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.13"
121 return 1 !! 107 return 0
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 <<
139 et_rel='\1\0' <<
140 fi 108 fi
141 printf "${et_rel}" | dd of="${btf_data <<
142 109
143 btf_vmlinux_bin_o=${btf_data} !! 110 info "BTF" ${1}
>> 111 LLVM_OBJCOPY=${OBJCOPY} ${PAHOLE} -J ${1}
144 } 112 }
145 113
146 # Create ${2}.o file with all symbols from the !! 114 # Create ${2} .o file with all symbols from the ${1} object file
147 kallsyms() 115 kallsyms()
148 { 116 {
>> 117 info KSYM ${2}
149 local kallsymopt; 118 local kallsymopt;
150 119
151 if is_enabled CONFIG_KALLSYMS_ALL; the !! 120 if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
152 kallsymopt="${kallsymopt} --al 121 kallsymopt="${kallsymopt} --all-symbols"
153 fi 122 fi
154 123
155 if is_enabled CONFIG_KALLSYMS_ABSOLUTE !! 124 if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then
156 kallsymopt="${kallsymopt} --ab 125 kallsymopt="${kallsymopt} --absolute-percpu"
157 fi 126 fi
158 127
159 info KSYMS "${2}.S" !! 128 if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then
160 scripts/kallsyms ${kallsymopt} "${1}" !! 129 kallsymopt="${kallsymopt} --base-relative"
>> 130 fi
161 131
162 info AS "${2}.o" !! 132 local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
163 ${CC} ${NOSTDINC_FLAGS} ${LINUXINCLUDE !! 133 ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
164 ${KBUILD_AFLAGS} ${KBUILD_AFLAGS <<
165 134
166 kallsymso=${2}.o !! 135 local afile="`basename ${2} .o`.S"
167 } <<
168 136
169 # Perform kallsyms for the given temporary vml !! 137 ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile}
170 sysmap_and_kallsyms() !! 138 ${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 } 139 }
177 140
178 # Create map file with all symbols from ${1} 141 # Create map file with all symbols from ${1}
179 # See mksymap for additional details 142 # See mksymap for additional details
180 mksysmap() 143 mksysmap()
181 { 144 {
182 info NM ${2} !! 145 ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
183 ${NM} -n "${1}" | sed -f "${srctree}/s <<
184 } 146 }
185 147
186 sorttable() !! 148 sortextable()
187 { 149 {
188 ${objtree}/scripts/sorttable ${1} !! 150 ${objtree}/scripts/sortextable ${1}
189 } 151 }
190 152
>> 153 # Delete output files in case of error
191 cleanup() 154 cleanup()
192 { 155 {
193 rm -f .btf.* !! 156 rm -f .tmp_System.map
>> 157 rm -f .tmp_kallsyms*
>> 158 rm -f .tmp_vmlinux*
194 rm -f System.map 159 rm -f System.map
195 rm -f vmlinux 160 rm -f vmlinux
196 rm -f vmlinux.map !! 161 rm -f vmlinux.o
197 } 162 }
198 163
>> 164 on_exit()
>> 165 {
>> 166 if [ $? -ne 0 ]; then
>> 167 cleanup
>> 168 fi
>> 169 }
>> 170 trap on_exit EXIT
>> 171
>> 172 on_signals()
>> 173 {
>> 174 exit 1
>> 175 }
>> 176 trap on_signals HUP INT QUIT TERM
>> 177
>> 178 #
>> 179 #
199 # Use "make V=1" to debug this script 180 # Use "make V=1" to debug this script
200 case "${KBUILD_VERBOSE}" in 181 case "${KBUILD_VERBOSE}" in
201 *1*) 182 *1*)
202 set -x 183 set -x
203 ;; 184 ;;
204 esac 185 esac
205 186
206 if [ "$1" = "clean" ]; then 187 if [ "$1" = "clean" ]; then
207 cleanup 188 cleanup
208 exit 0 189 exit 0
209 fi 190 fi
210 191
211 ${MAKE} -f "${srctree}/scripts/Makefile.build" !! 192 # We need access to CONFIG_ symbols
212 !! 193 . include/config/auto.conf
213 btf_vmlinux_bin_o= <<
214 kallsymso= <<
215 strip_debug= <<
216 <<
217 if is_enabled CONFIG_KALLSYMS; then <<
218 truncate -s0 .tmp_vmlinux.kallsyms0.sy <<
219 kallsyms .tmp_vmlinux.kallsyms0.syms . <<
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 <<
239 194
240 if is_enabled CONFIG_KALLSYMS; then !! 195 # Update version
>> 196 info GEN .version
>> 197 if [ -r .version ]; then
>> 198 VERSION=$(expr 0$(cat .version) + 1)
>> 199 echo $VERSION > .version
>> 200 else
>> 201 rm -f .version
>> 202 echo 1 > .version
>> 203 fi;
>> 204
>> 205 # final build of init/
>> 206 ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init
>> 207
>> 208 #link vmlinux.o
>> 209 info LD vmlinux.o
>> 210 modpost_link vmlinux.o
>> 211
>> 212 # modpost vmlinux.o to check for section mismatches
>> 213 ${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
>> 214
>> 215 info MODINFO modules.builtin.modinfo
>> 216 ${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo
>> 217
>> 218 kallsymso=""
>> 219 kallsyms_vmlinux=""
>> 220 if [ -n "${CONFIG_KALLSYMS}" ]; then
241 221
242 # kallsyms support 222 # kallsyms support
243 # Generate section listing all symbols 223 # Generate section listing all symbols and add it into vmlinux
244 # It's a four step process: !! 224 # It's a three step process:
245 # 0) Generate a dummy __kallsyms with !! 225 # 1) Link .tmp_vmlinux1 so it has all symbols and sections,
246 # 1) Link .tmp_vmlinux.kallsyms1 so i !! 226 # but __kallsyms is empty.
247 # with a dummy __kallsyms. <<
248 # Running kallsyms on that gives u 227 # Running kallsyms on that gives us .tmp_kallsyms1.o with
249 # the right size 228 # the right size
250 # 2) Link .tmp_vmlinux.kallsyms2 so i !! 229 # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of
251 # the right size, but due to the a 230 # the right size, but due to the added section, some
252 # addresses have shifted. 231 # addresses have shifted.
253 # From here, we generate a correct !! 232 # From here, we generate a correct .tmp_kallsyms2.o
254 # 3) That link may have expanded the 233 # 3) That link may have expanded the kernel image enough that
255 # more linker branch stubs / tramp 234 # more linker branch stubs / trampolines had to be added, which
256 # introduces new names, which furt 235 # introduces new names, which further expands kallsyms. Do another
257 # pass if that is the case. In the 236 # pass if that is the case. In theory it's possible this results
258 # in even more stubs, but unlikely 237 # in even more stubs, but unlikely.
259 # KALLSYMS_EXTRA_PASS=1 may also u 238 # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around
260 # other bugs. 239 # other bugs.
261 # 4) The correct ${kallsymso} is link 240 # 4) The correct ${kallsymso} is linked into the final vmlinux.
262 # 241 #
263 # a) Verify that the System.map from 242 # a) Verify that the System.map from vmlinux matches the map from
264 # ${kallsymso}. 243 # ${kallsymso}.
265 244
266 # The kallsyms linking does not need d !! 245 kallsymso=.tmp_kallsyms2.o
267 strip_debug=1 !! 246 kallsyms_vmlinux=.tmp_vmlinux2
268 247
269 sysmap_and_kallsyms .tmp_vmlinux1 !! 248 # step 1
270 size1=$(${CONFIG_SHELL} "${srctree}/sc !! 249 vmlinux_link "" .tmp_vmlinux1
271 !! 250 kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
272 vmlinux_link .tmp_vmlinux2 !! 251
273 sysmap_and_kallsyms .tmp_vmlinux2 !! 252 # step 2
274 size2=$(${CONFIG_SHELL} "${srctree}/sc !! 253 vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2
>> 254 kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
>> 255
>> 256 # step 3
>> 257 size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms1.o)
>> 258 size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms2.o)
275 259
276 if [ $size1 -ne $size2 ] || [ -n "${KA 260 if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
277 vmlinux_link .tmp_vmlinux3 !! 261 kallsymso=.tmp_kallsyms3.o
278 sysmap_and_kallsyms .tmp_vmlin !! 262 kallsyms_vmlinux=.tmp_vmlinux3
>> 263
>> 264 vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3
>> 265
>> 266 kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
279 fi 267 fi
280 fi 268 fi
281 269
282 strip_debug= !! 270 info LD vmlinux
>> 271 vmlinux_link "${kallsymso}" vmlinux
283 272
284 vmlinux_link vmlinux !! 273 if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then
>> 274 gen_btf vmlinux
>> 275 fi
285 276
286 # fill in BTF IDs !! 277 if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
287 if is_enabled CONFIG_DEBUG_INFO_BTF && is_enab !! 278 info SORTEX vmlinux
288 info BTFIDS vmlinux !! 279 sortextable vmlinux
289 ${RESOLVE_BTFIDS} vmlinux <<
290 fi 280 fi
291 281
>> 282 info SYSMAP System.map
292 mksysmap vmlinux System.map 283 mksysmap vmlinux System.map
293 284
294 if is_enabled CONFIG_BUILDTIME_TABLE_SORT; the <<
295 info SORTTAB vmlinux <<
296 if ! sorttable vmlinux; then <<
297 echo >&2 Failed to sort kernel <<
298 exit 1 <<
299 fi <<
300 fi <<
301 <<
302 # step a (see comment above) 285 # step a (see comment above)
303 if is_enabled CONFIG_KALLSYMS; then !! 286 if [ -n "${CONFIG_KALLSYMS}" ]; then
304 if ! cmp -s System.map "${kallsyms_sys !! 287 mksysmap ${kallsyms_vmlinux} .tmp_System.map
>> 288
>> 289 if ! cmp -s System.map .tmp_System.map; then
305 echo >&2 Inconsistent kallsyms 290 echo >&2 Inconsistent kallsyms data
306 echo >&2 'Try "make KALLSYMS_E !! 291 echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
307 exit 1 292 exit 1
308 fi 293 fi
309 fi 294 fi
310 <<
311 # For fixdep <<
312 echo "vmlinux: $0" > .vmlinux.d <<
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