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 AN |
59 | # ${1} - output file |
60 | # ${@:2} - optional extra .o files | |
1f2bfbd0 SR |
61 | vmlinux_link() |
62 | { | |
63 | local lds="${objtree}/${KBUILD_LDS}" | |
a5967db9 | 64 | local objects |
1f2bfbd0 SR |
65 | |
66 | if [ "${SRCARCH}" != "um" ]; then | |
6358d6e8 | 67 | objects="--whole-archive \ |
d151e971 | 68 | ${KBUILD_VMLINUX_OBJS} \ |
6358d6e8 NP |
69 | --no-whole-archive \ |
70 | --start-group \ | |
71 | ${KBUILD_VMLINUX_LIBS} \ | |
72 | --end-group \ | |
341dfcf8 | 73 | ${@:2}" |
a5967db9 | 74 | |
341dfcf8 | 75 | ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} -o ${1} \ |
a5967db9 | 76 | -T ${lds} ${objects} |
1f2bfbd0 | 77 | else |
6358d6e8 | 78 | objects="-Wl,--whole-archive \ |
d151e971 | 79 | ${KBUILD_VMLINUX_OBJS} \ |
6358d6e8 NP |
80 | -Wl,--no-whole-archive \ |
81 | -Wl,--start-group \ | |
82 | ${KBUILD_VMLINUX_LIBS} \ | |
83 | -Wl,--end-group \ | |
341dfcf8 | 84 | ${@:2}" |
a5967db9 | 85 | |
341dfcf8 | 86 | ${CC} ${CFLAGS_vmlinux} -o ${1} \ |
6358d6e8 NP |
87 | -Wl,-T,${lds} \ |
88 | ${objects} \ | |
a5967db9 | 89 | -lutil -lrt -lpthread |
1f2bfbd0 SR |
90 | rm -f linux |
91 | fi | |
92 | } | |
93 | ||
e83b9f55 | 94 | # generate .BTF typeinfo from DWARF debuginfo |
341dfcf8 AN |
95 | # ${1} - vmlinux image |
96 | # ${2} - file to dump raw BTF data into | |
e83b9f55 AN |
97 | gen_btf() |
98 | { | |
341dfcf8 AN |
99 | local pahole_ver |
100 | local bin_arch | |
e83b9f55 | 101 | |
581b31c3 AN |
102 | if ! [ -x "$(command -v ${PAHOLE})" ]; then |
103 | info "BTF" "${1}: pahole (${PAHOLE}) is not available" | |
341dfcf8 | 104 | return 1 |
581b31c3 AN |
105 | fi |
106 | ||
e83b9f55 AN |
107 | pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/') |
108 | if [ "${pahole_ver}" -lt "113" ]; then | |
109 | info "BTF" "${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.13" | |
341dfcf8 | 110 | return 1 |
e83b9f55 AN |
111 | fi |
112 | ||
341dfcf8 AN |
113 | info "BTF" ${2} |
114 | vmlinux_link ${1} | |
e83b9f55 | 115 | LLVM_OBJCOPY=${OBJCOPY} ${PAHOLE} -J ${1} |
341dfcf8 AN |
116 | |
117 | # dump .BTF section into raw binary file to link with final vmlinux | |
118 | bin_arch=$(${OBJDUMP} -f ${1} | grep architecture | \ | |
119 | cut -d, -f1 | cut -d' ' -f2) | |
7fd78568 | 120 | ${OBJCOPY} --dump-section .BTF=.btf.vmlinux.bin ${1} 2>/dev/null |
341dfcf8 | 121 | ${OBJCOPY} -I binary -O ${CONFIG_OUTPUT_FORMAT} -B ${bin_arch} \ |
7fd78568 | 122 | --rename-section .data=.BTF .btf.vmlinux.bin ${2} |
e83b9f55 | 123 | } |
1f2bfbd0 SR |
124 | |
125 | # Create ${2} .o file with all symbols from the ${1} object file | |
126 | kallsyms() | |
127 | { | |
128 | info KSYM ${2} | |
129 | local kallsymopt; | |
130 | ||
131 | if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then | |
6895f97e | 132 | kallsymopt="${kallsymopt} --all-symbols" |
1f2bfbd0 SR |
133 | fi |
134 | ||
4d5d5664 | 135 | if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then |
c6bda7c9 RR |
136 | kallsymopt="${kallsymopt} --absolute-percpu" |
137 | fi | |
138 | ||
2213e9a6 AB |
139 | if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then |
140 | kallsymopt="${kallsymopt} --base-relative" | |
141 | fi | |
142 | ||
00e6c28c SR |
143 | local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ |
144 | ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}" | |
1f2bfbd0 | 145 | |
a0439342 AB |
146 | local afile="`basename ${2} .o`.S" |
147 | ||
148 | ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile} | |
149 | ${CC} ${aflags} -c -o ${2} ${afile} | |
1f2bfbd0 SR |
150 | } |
151 | ||
152 | # Create map file with all symbols from ${1} | |
153 | # See mksymap for additional details | |
154 | mksysmap() | |
155 | { | |
156 | ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} | |
157 | } | |
158 | ||
1347a2ce LT |
159 | sortextable() |
160 | { | |
161 | ${objtree}/scripts/sortextable ${1} | |
162 | } | |
163 | ||
1f2bfbd0 | 164 | # Delete output files in case of error |
1f2bfbd0 SR |
165 | cleanup() |
166 | { | |
341dfcf8 | 167 | rm -f .btf.* |
1f2bfbd0 SR |
168 | rm -f .tmp_System.map |
169 | rm -f .tmp_kallsyms* | |
1f2bfbd0 SR |
170 | rm -f .tmp_vmlinux* |
171 | rm -f System.map | |
172 | rm -f vmlinux | |
173 | rm -f vmlinux.o | |
174 | } | |
175 | ||
ab160dbb SB |
176 | on_exit() |
177 | { | |
178 | if [ $? -ne 0 ]; then | |
179 | cleanup | |
180 | fi | |
181 | } | |
182 | trap on_exit EXIT | |
183 | ||
184 | on_signals() | |
185 | { | |
186 | exit 1 | |
187 | } | |
188 | trap on_signals HUP INT QUIT TERM | |
189 | ||
1f2bfbd0 SR |
190 | # |
191 | # | |
192 | # Use "make V=1" to debug this script | |
193 | case "${KBUILD_VERBOSE}" in | |
194 | *1*) | |
195 | set -x | |
196 | ;; | |
197 | esac | |
198 | ||
199 | if [ "$1" = "clean" ]; then | |
200 | cleanup | |
201 | exit 0 | |
202 | fi | |
203 | ||
204 | # We need access to CONFIG_ symbols | |
94cf8acc | 205 | . include/config/auto.conf |
1f2bfbd0 | 206 | |
1f2bfbd0 SR |
207 | # Update version |
208 | info GEN .version | |
278ae604 MY |
209 | if [ -r .version ]; then |
210 | VERSION=$(expr 0$(cat .version) + 1) | |
211 | echo $VERSION > .version | |
1f2bfbd0 | 212 | else |
278ae604 MY |
213 | rm -f .version |
214 | echo 1 > .version | |
1f2bfbd0 SR |
215 | fi; |
216 | ||
217 | # final build of init/ | |
a7b151ff | 218 | ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init |
1f2bfbd0 | 219 | |
abac4c89 NP |
220 | #link vmlinux.o |
221 | info LD vmlinux.o | |
222 | modpost_link vmlinux.o | |
223 | ||
224 | # modpost vmlinux.o to check for section mismatches | |
a721588d | 225 | ${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1 |
abac4c89 | 226 | |
898490c0 AG |
227 | info MODINFO modules.builtin.modinfo |
228 | ${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo | |
229 | ||
7fd78568 | 230 | btf_vmlinux_bin_o="" |
341dfcf8 | 231 | if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then |
7fd78568 AN |
232 | if gen_btf .tmp_vmlinux.btf .btf.vmlinux.bin.o ; then |
233 | btf_vmlinux_bin_o=.btf.vmlinux.bin.o | |
341dfcf8 AN |
234 | fi |
235 | fi | |
236 | ||
1f2bfbd0 SR |
237 | kallsymso="" |
238 | kallsyms_vmlinux="" | |
239 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
240 | ||
241 | # kallsyms support | |
242 | # Generate section listing all symbols and add it into vmlinux | |
243 | # It's a three step process: | |
244 | # 1) Link .tmp_vmlinux1 so it has all symbols and sections, | |
245 | # but __kallsyms is empty. | |
246 | # Running kallsyms on that gives us .tmp_kallsyms1.o with | |
247 | # the right size | |
248 | # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of | |
249 | # the right size, but due to the added section, some | |
250 | # addresses have shifted. | |
251 | # From here, we generate a correct .tmp_kallsyms2.o | |
7e2b37c9 NP |
252 | # 3) That link may have expanded the kernel image enough that |
253 | # more linker branch stubs / trampolines had to be added, which | |
254 | # introduces new names, which further expands kallsyms. Do another | |
255 | # pass if that is the case. In theory it's possible this results | |
256 | # in even more stubs, but unlikely. | |
257 | # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around | |
258 | # other bugs. | |
259 | # 4) The correct ${kallsymso} is linked into the final vmlinux. | |
1f2bfbd0 SR |
260 | # |
261 | # a) Verify that the System.map from vmlinux matches the map from | |
262 | # ${kallsymso}. | |
263 | ||
264 | kallsymso=.tmp_kallsyms2.o | |
265 | kallsyms_vmlinux=.tmp_vmlinux2 | |
266 | ||
267 | # step 1 | |
7fd78568 | 268 | vmlinux_link .tmp_vmlinux1 ${btf_vmlinux_bin_o} |
1f2bfbd0 SR |
269 | kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o |
270 | ||
271 | # step 2 | |
7fd78568 | 272 | vmlinux_link .tmp_vmlinux2 .tmp_kallsyms1.o ${btf_vmlinux_bin_o} |
1f2bfbd0 SR |
273 | kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o |
274 | ||
7e2b37c9 | 275 | # step 3 |
a670b0b4 MF |
276 | size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms1.o) |
277 | size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms2.o) | |
7e2b37c9 NP |
278 | |
279 | if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then | |
1f2bfbd0 SR |
280 | kallsymso=.tmp_kallsyms3.o |
281 | kallsyms_vmlinux=.tmp_vmlinux3 | |
282 | ||
7fd78568 | 283 | vmlinux_link .tmp_vmlinux3 .tmp_kallsyms2.o ${btf_vmlinux_bin_o} |
1f2bfbd0 SR |
284 | kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o |
285 | fi | |
286 | fi | |
287 | ||
288 | info LD vmlinux | |
7fd78568 | 289 | vmlinux_link vmlinux "${kallsymso}" "${btf_vmlinux_bin_o}" |
e83b9f55 | 290 | |
1347a2ce LT |
291 | if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then |
292 | info SORTEX vmlinux | |
293 | sortextable vmlinux | |
294 | fi | |
295 | ||
1f2bfbd0 SR |
296 | info SYSMAP System.map |
297 | mksysmap vmlinux System.map | |
298 | ||
299 | # step a (see comment above) | |
300 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
301 | mksysmap ${kallsyms_vmlinux} .tmp_System.map | |
302 | ||
303 | if ! cmp -s System.map .tmp_System.map; then | |
5369f550 | 304 | echo >&2 Inconsistent kallsyms data |
367e43c5 | 305 | echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround |
1f2bfbd0 SR |
306 | exit 1 |
307 | fi | |
308 | fi |