Commit | Line | Data |
---|---|---|
1f2bfbd0 | 1 | #!/bin/sh |
b2441318 | 2 | # SPDX-License-Identifier: GPL-2.0 |
1f2bfbd0 SR |
3 | # |
4 | # link vmlinux | |
5 | # | |
d151e971 MY |
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. | |
1f2bfbd0 SR |
11 | # |
12 | # vmlinux | |
13 | # ^ | |
14 | # | | |
d151e971 MY |
15 | # +--< $(KBUILD_VMLINUX_OBJS) |
16 | # | +--< init/built-in.a drivers/built-in.a mm/built-in.a + more | |
1f2bfbd0 | 17 | # | |
3a166fc2 NP |
18 | # +--< $(KBUILD_VMLINUX_LIBS) |
19 | # | +--< lib/lib.a + more | |
20 | # | | |
1f2bfbd0 SR |
21 | # +-< ${kallsymso} (see description in KALLSYMS section) |
22 | # | |
23 | # vmlinux version (uname -v) cannot be updated during normal | |
24 | # descending-into-subdirs phase since we do not yet know if we need to | |
25 | # update vmlinux. | |
26 | # Therefore this step is delayed until just before final link of vmlinux. | |
27 | # | |
28 | # System.map is generated to document addresses of all kernel symbols | |
29 | ||
30 | # Error out on error | |
31 | set -e | |
32 | ||
33 | # Nice output in kbuild format | |
34 | # Will be supressed by "make -s" | |
35 | info() | |
36 | { | |
37 | if [ "${quiet}" != "silent_" ]; then | |
e83b9f55 | 38 | printf " %-7s %s\n" "${1}" "${2}" |
1f2bfbd0 SR |
39 | fi |
40 | } | |
41 | ||
42 | # Link of vmlinux.o used for section mismatch analysis | |
43 | # ${1} output file | |
44 | modpost_link() | |
45 | { | |
a5967db9 SR |
46 | local objects |
47 | ||
6358d6e8 | 48 | objects="--whole-archive \ |
d151e971 | 49 | ${KBUILD_VMLINUX_OBJS} \ |
6358d6e8 NP |
50 | --no-whole-archive \ |
51 | --start-group \ | |
52 | ${KBUILD_VMLINUX_LIBS} \ | |
53 | --end-group" | |
54 | ||
d503ac53 | 55 | ${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${objects} |
1f2bfbd0 SR |
56 | } |
57 | ||
58 | # Link of vmlinux | |
341dfcf8 | 59 | # ${1} - output file |
618916a4 | 60 | # ${2}, ${3}, ... - optional extra .o files |
1f2bfbd0 SR |
61 | vmlinux_link() |
62 | { | |
63 | local lds="${objtree}/${KBUILD_LDS}" | |
618916a4 | 64 | local output=${1} |
a5967db9 | 65 | local objects |
1f2bfbd0 | 66 | |
d7b0827f LT |
67 | info LD ${output} |
68 | ||
618916a4 AN |
69 | # skip output file argument |
70 | shift | |
71 | ||
1f2bfbd0 | 72 | if [ "${SRCARCH}" != "um" ]; then |
6358d6e8 | 73 | objects="--whole-archive \ |
d151e971 | 74 | ${KBUILD_VMLINUX_OBJS} \ |
6358d6e8 NP |
75 | --no-whole-archive \ |
76 | --start-group \ | |
77 | ${KBUILD_VMLINUX_LIBS} \ | |
78 | --end-group \ | |
618916a4 | 79 | ${@}" |
a5967db9 | 80 | |
618916a4 AN |
81 | ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} \ |
82 | -o ${output} \ | |
a5967db9 | 83 | -T ${lds} ${objects} |
1f2bfbd0 | 84 | else |
6358d6e8 | 85 | objects="-Wl,--whole-archive \ |
d151e971 | 86 | ${KBUILD_VMLINUX_OBJS} \ |
6358d6e8 NP |
87 | -Wl,--no-whole-archive \ |
88 | -Wl,--start-group \ | |
89 | ${KBUILD_VMLINUX_LIBS} \ | |
90 | -Wl,--end-group \ | |
618916a4 | 91 | ${@}" |
a5967db9 | 92 | |
618916a4 AN |
93 | ${CC} ${CFLAGS_vmlinux} \ |
94 | -o ${output} \ | |
6358d6e8 NP |
95 | -Wl,-T,${lds} \ |
96 | ${objects} \ | |
a5967db9 | 97 | -lutil -lrt -lpthread |
1f2bfbd0 SR |
98 | rm -f linux |
99 | fi | |
100 | } | |
101 | ||
e83b9f55 | 102 | # generate .BTF typeinfo from DWARF debuginfo |
341dfcf8 AN |
103 | # ${1} - vmlinux image |
104 | # ${2} - file to dump raw BTF data into | |
e83b9f55 AN |
105 | gen_btf() |
106 | { | |
341dfcf8 AN |
107 | local pahole_ver |
108 | local bin_arch | |
e83b9f55 | 109 | |
581b31c3 AN |
110 | if ! [ -x "$(command -v ${PAHOLE})" ]; then |
111 | info "BTF" "${1}: pahole (${PAHOLE}) is not available" | |
341dfcf8 | 112 | return 1 |
581b31c3 AN |
113 | fi |
114 | ||
e83b9f55 AN |
115 | pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/') |
116 | if [ "${pahole_ver}" -lt "113" ]; then | |
117 | info "BTF" "${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.13" | |
341dfcf8 | 118 | return 1 |
e83b9f55 AN |
119 | fi |
120 | ||
341dfcf8 AN |
121 | info "BTF" ${2} |
122 | vmlinux_link ${1} | |
e83b9f55 | 123 | LLVM_OBJCOPY=${OBJCOPY} ${PAHOLE} -J ${1} |
341dfcf8 AN |
124 | |
125 | # dump .BTF section into raw binary file to link with final vmlinux | |
fdf37037 | 126 | bin_arch=$(LANG=C ${OBJDUMP} -f ${1} | grep architecture | \ |
341dfcf8 | 127 | cut -d, -f1 | cut -d' ' -f2) |
fdf37037 IL |
128 | bin_format=$(LANG=C ${OBJDUMP} -f ${1} | grep 'file format' | \ |
129 | awk '{print $4}') | |
7fd78568 | 130 | ${OBJCOPY} --dump-section .BTF=.btf.vmlinux.bin ${1} 2>/dev/null |
fdf37037 | 131 | ${OBJCOPY} -I binary -O ${bin_format} -B ${bin_arch} \ |
7fd78568 | 132 | --rename-section .data=.BTF .btf.vmlinux.bin ${2} |
e83b9f55 | 133 | } |
1f2bfbd0 SR |
134 | |
135 | # Create ${2} .o file with all symbols from the ${1} object file | |
136 | kallsyms() | |
137 | { | |
138 | info KSYM ${2} | |
139 | local kallsymopt; | |
140 | ||
141 | if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then | |
6895f97e | 142 | kallsymopt="${kallsymopt} --all-symbols" |
1f2bfbd0 SR |
143 | fi |
144 | ||
4d5d5664 | 145 | if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then |
c6bda7c9 RR |
146 | kallsymopt="${kallsymopt} --absolute-percpu" |
147 | fi | |
148 | ||
2213e9a6 AB |
149 | if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then |
150 | kallsymopt="${kallsymopt} --base-relative" | |
151 | fi | |
152 | ||
00e6c28c SR |
153 | local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ |
154 | ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}" | |
1f2bfbd0 | 155 | |
a0439342 AB |
156 | local afile="`basename ${2} .o`.S" |
157 | ||
158 | ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile} | |
159 | ${CC} ${aflags} -c -o ${2} ${afile} | |
1f2bfbd0 SR |
160 | } |
161 | ||
8959e392 KC |
162 | # Perform one step in kallsyms generation, including temporary linking of |
163 | # vmlinux. | |
164 | kallsyms_step() | |
165 | { | |
166 | kallsymso_prev=${kallsymso} | |
167 | kallsymso=.tmp_kallsyms${1}.o | |
168 | kallsyms_vmlinux=.tmp_vmlinux${1} | |
169 | ||
d7b0827f | 170 | vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o} |
8959e392 KC |
171 | kallsyms ${kallsyms_vmlinux} ${kallsymso} |
172 | } | |
173 | ||
1f2bfbd0 SR |
174 | # Create map file with all symbols from ${1} |
175 | # See mksymap for additional details | |
176 | mksysmap() | |
177 | { | |
178 | ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} | |
179 | } | |
180 | ||
1347a2ce LT |
181 | sortextable() |
182 | { | |
183 | ${objtree}/scripts/sortextable ${1} | |
184 | } | |
185 | ||
1f2bfbd0 | 186 | # Delete output files in case of error |
1f2bfbd0 SR |
187 | cleanup() |
188 | { | |
341dfcf8 | 189 | rm -f .btf.* |
1f2bfbd0 SR |
190 | rm -f .tmp_System.map |
191 | rm -f .tmp_kallsyms* | |
1f2bfbd0 SR |
192 | rm -f .tmp_vmlinux* |
193 | rm -f System.map | |
194 | rm -f vmlinux | |
195 | rm -f vmlinux.o | |
196 | } | |
197 | ||
ab160dbb SB |
198 | on_exit() |
199 | { | |
200 | if [ $? -ne 0 ]; then | |
201 | cleanup | |
202 | fi | |
203 | } | |
204 | trap on_exit EXIT | |
205 | ||
206 | on_signals() | |
207 | { | |
208 | exit 1 | |
209 | } | |
210 | trap on_signals HUP INT QUIT TERM | |
211 | ||
1f2bfbd0 SR |
212 | # |
213 | # | |
214 | # Use "make V=1" to debug this script | |
215 | case "${KBUILD_VERBOSE}" in | |
216 | *1*) | |
217 | set -x | |
218 | ;; | |
219 | esac | |
220 | ||
221 | if [ "$1" = "clean" ]; then | |
222 | cleanup | |
223 | exit 0 | |
224 | fi | |
225 | ||
226 | # We need access to CONFIG_ symbols | |
94cf8acc | 227 | . include/config/auto.conf |
1f2bfbd0 | 228 | |
1f2bfbd0 SR |
229 | # Update version |
230 | info GEN .version | |
278ae604 MY |
231 | if [ -r .version ]; then |
232 | VERSION=$(expr 0$(cat .version) + 1) | |
233 | echo $VERSION > .version | |
1f2bfbd0 | 234 | else |
278ae604 MY |
235 | rm -f .version |
236 | echo 1 > .version | |
1f2bfbd0 SR |
237 | fi; |
238 | ||
239 | # final build of init/ | |
a7b151ff | 240 | ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init |
1f2bfbd0 | 241 | |
abac4c89 NP |
242 | #link vmlinux.o |
243 | info LD vmlinux.o | |
244 | modpost_link vmlinux.o | |
245 | ||
246 | # modpost vmlinux.o to check for section mismatches | |
a721588d | 247 | ${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1 |
abac4c89 | 248 | |
898490c0 AG |
249 | info MODINFO modules.builtin.modinfo |
250 | ${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo | |
251 | ||
7fd78568 | 252 | btf_vmlinux_bin_o="" |
341dfcf8 | 253 | if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then |
7fd78568 AN |
254 | if gen_btf .tmp_vmlinux.btf .btf.vmlinux.bin.o ; then |
255 | btf_vmlinux_bin_o=.btf.vmlinux.bin.o | |
341dfcf8 AN |
256 | fi |
257 | fi | |
258 | ||
1f2bfbd0 | 259 | kallsymso="" |
8959e392 | 260 | kallsymso_prev="" |
1f2bfbd0 SR |
261 | kallsyms_vmlinux="" |
262 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
263 | ||
264 | # kallsyms support | |
265 | # Generate section listing all symbols and add it into vmlinux | |
266 | # It's a three step process: | |
267 | # 1) Link .tmp_vmlinux1 so it has all symbols and sections, | |
268 | # but __kallsyms is empty. | |
269 | # Running kallsyms on that gives us .tmp_kallsyms1.o with | |
270 | # the right size | |
271 | # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of | |
272 | # the right size, but due to the added section, some | |
273 | # addresses have shifted. | |
274 | # From here, we generate a correct .tmp_kallsyms2.o | |
7e2b37c9 NP |
275 | # 3) That link may have expanded the kernel image enough that |
276 | # more linker branch stubs / trampolines had to be added, which | |
277 | # introduces new names, which further expands kallsyms. Do another | |
278 | # pass if that is the case. In theory it's possible this results | |
279 | # in even more stubs, but unlikely. | |
280 | # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around | |
281 | # other bugs. | |
282 | # 4) The correct ${kallsymso} is linked into the final vmlinux. | |
1f2bfbd0 SR |
283 | # |
284 | # a) Verify that the System.map from vmlinux matches the map from | |
285 | # ${kallsymso}. | |
286 | ||
8959e392 KC |
287 | kallsyms_step 1 |
288 | kallsyms_step 2 | |
1f2bfbd0 | 289 | |
7e2b37c9 | 290 | # step 3 |
8959e392 KC |
291 | size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso_prev}) |
292 | size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso}) | |
7e2b37c9 NP |
293 | |
294 | if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then | |
8959e392 | 295 | kallsyms_step 3 |
1f2bfbd0 SR |
296 | fi |
297 | fi | |
298 | ||
d7b0827f | 299 | vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o} |
e83b9f55 | 300 | |
1347a2ce LT |
301 | if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then |
302 | info SORTEX vmlinux | |
303 | sortextable vmlinux | |
304 | fi | |
305 | ||
1f2bfbd0 SR |
306 | info SYSMAP System.map |
307 | mksysmap vmlinux System.map | |
308 | ||
309 | # step a (see comment above) | |
310 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
311 | mksysmap ${kallsyms_vmlinux} .tmp_System.map | |
312 | ||
313 | if ! cmp -s System.map .tmp_System.map; then | |
5369f550 | 314 | echo >&2 Inconsistent kallsyms data |
367e43c5 | 315 | echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround |
1f2bfbd0 SR |
316 | exit 1 |
317 | fi | |
318 | fi |