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 | |
38 | printf " %-7s %s\n" ${1} ${2} | |
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 | |
59 | # ${1} - optional extra .o files | |
60 | # ${2} - output file | |
61 | vmlinux_link() | |
62 | { | |
63 | local lds="${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 \ | |
73 | ${1}" | |
a5967db9 | 74 | |
d503ac53 | 75 | ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} \ |
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 \ | |
84 | ${1}" | |
a5967db9 | 85 | |
6358d6e8 NP |
86 | ${CC} ${CFLAGS_vmlinux} -o ${2} \ |
87 | -Wl,-T,${lds} \ | |
88 | ${objects} \ | |
a5967db9 | 89 | -lutil -lrt -lpthread |
1f2bfbd0 SR |
90 | rm -f linux |
91 | fi | |
92 | } | |
93 | ||
94 | ||
95 | # Create ${2} .o file with all symbols from the ${1} object file | |
96 | kallsyms() | |
97 | { | |
98 | info KSYM ${2} | |
99 | local kallsymopt; | |
100 | ||
101 | if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then | |
6895f97e | 102 | kallsymopt="${kallsymopt} --all-symbols" |
1f2bfbd0 SR |
103 | fi |
104 | ||
4d5d5664 | 105 | if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then |
c6bda7c9 RR |
106 | kallsymopt="${kallsymopt} --absolute-percpu" |
107 | fi | |
108 | ||
2213e9a6 AB |
109 | if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then |
110 | kallsymopt="${kallsymopt} --base-relative" | |
111 | fi | |
112 | ||
00e6c28c SR |
113 | local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ |
114 | ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}" | |
1f2bfbd0 | 115 | |
a0439342 AB |
116 | local afile="`basename ${2} .o`.S" |
117 | ||
118 | ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile} | |
119 | ${CC} ${aflags} -c -o ${2} ${afile} | |
1f2bfbd0 SR |
120 | } |
121 | ||
122 | # Create map file with all symbols from ${1} | |
123 | # See mksymap for additional details | |
124 | mksysmap() | |
125 | { | |
126 | ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} | |
127 | } | |
128 | ||
1347a2ce LT |
129 | sortextable() |
130 | { | |
131 | ${objtree}/scripts/sortextable ${1} | |
132 | } | |
133 | ||
1f2bfbd0 | 134 | # Delete output files in case of error |
1f2bfbd0 SR |
135 | cleanup() |
136 | { | |
1f2bfbd0 SR |
137 | rm -f .tmp_System.map |
138 | rm -f .tmp_kallsyms* | |
1f2bfbd0 SR |
139 | rm -f .tmp_vmlinux* |
140 | rm -f System.map | |
141 | rm -f vmlinux | |
142 | rm -f vmlinux.o | |
143 | } | |
144 | ||
ab160dbb SB |
145 | on_exit() |
146 | { | |
147 | if [ $? -ne 0 ]; then | |
148 | cleanup | |
149 | fi | |
150 | } | |
151 | trap on_exit EXIT | |
152 | ||
153 | on_signals() | |
154 | { | |
155 | exit 1 | |
156 | } | |
157 | trap on_signals HUP INT QUIT TERM | |
158 | ||
1f2bfbd0 SR |
159 | # |
160 | # | |
161 | # Use "make V=1" to debug this script | |
162 | case "${KBUILD_VERBOSE}" in | |
163 | *1*) | |
164 | set -x | |
165 | ;; | |
166 | esac | |
167 | ||
168 | if [ "$1" = "clean" ]; then | |
169 | cleanup | |
170 | exit 0 | |
171 | fi | |
172 | ||
173 | # We need access to CONFIG_ symbols | |
423a8155 MM |
174 | case "${KCONFIG_CONFIG}" in |
175 | */*) | |
176 | . "${KCONFIG_CONFIG}" | |
177 | ;; | |
178 | *) | |
179 | # Force using a file from the current directory | |
180 | . "./${KCONFIG_CONFIG}" | |
181 | esac | |
1f2bfbd0 | 182 | |
1f2bfbd0 SR |
183 | # Update version |
184 | info GEN .version | |
278ae604 MY |
185 | if [ -r .version ]; then |
186 | VERSION=$(expr 0$(cat .version) + 1) | |
187 | echo $VERSION > .version | |
1f2bfbd0 | 188 | else |
278ae604 MY |
189 | rm -f .version |
190 | echo 1 > .version | |
1f2bfbd0 SR |
191 | fi; |
192 | ||
193 | # final build of init/ | |
a7b151ff | 194 | ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init |
1f2bfbd0 | 195 | |
abac4c89 NP |
196 | #link vmlinux.o |
197 | info LD vmlinux.o | |
198 | modpost_link vmlinux.o | |
199 | ||
200 | # modpost vmlinux.o to check for section mismatches | |
201 | ${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o | |
202 | ||
1f2bfbd0 SR |
203 | kallsymso="" |
204 | kallsyms_vmlinux="" | |
205 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
206 | ||
207 | # kallsyms support | |
208 | # Generate section listing all symbols and add it into vmlinux | |
209 | # It's a three step process: | |
210 | # 1) Link .tmp_vmlinux1 so it has all symbols and sections, | |
211 | # but __kallsyms is empty. | |
212 | # Running kallsyms on that gives us .tmp_kallsyms1.o with | |
213 | # the right size | |
214 | # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of | |
215 | # the right size, but due to the added section, some | |
216 | # addresses have shifted. | |
217 | # From here, we generate a correct .tmp_kallsyms2.o | |
7e2b37c9 NP |
218 | # 3) That link may have expanded the kernel image enough that |
219 | # more linker branch stubs / trampolines had to be added, which | |
220 | # introduces new names, which further expands kallsyms. Do another | |
221 | # pass if that is the case. In theory it's possible this results | |
222 | # in even more stubs, but unlikely. | |
223 | # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around | |
224 | # other bugs. | |
225 | # 4) The correct ${kallsymso} is linked into the final vmlinux. | |
1f2bfbd0 SR |
226 | # |
227 | # a) Verify that the System.map from vmlinux matches the map from | |
228 | # ${kallsymso}. | |
229 | ||
230 | kallsymso=.tmp_kallsyms2.o | |
231 | kallsyms_vmlinux=.tmp_vmlinux2 | |
232 | ||
233 | # step 1 | |
234 | vmlinux_link "" .tmp_vmlinux1 | |
235 | kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o | |
236 | ||
237 | # step 2 | |
238 | vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2 | |
239 | kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o | |
240 | ||
7e2b37c9 | 241 | # step 3 |
a670b0b4 MF |
242 | size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms1.o) |
243 | size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms2.o) | |
7e2b37c9 NP |
244 | |
245 | if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then | |
1f2bfbd0 SR |
246 | kallsymso=.tmp_kallsyms3.o |
247 | kallsyms_vmlinux=.tmp_vmlinux3 | |
248 | ||
249 | vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3 | |
250 | ||
251 | kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o | |
252 | fi | |
253 | fi | |
254 | ||
255 | info LD vmlinux | |
256 | vmlinux_link "${kallsymso}" vmlinux | |
257 | ||
1347a2ce LT |
258 | if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then |
259 | info SORTEX vmlinux | |
260 | sortextable vmlinux | |
261 | fi | |
262 | ||
1f2bfbd0 SR |
263 | info SYSMAP System.map |
264 | mksysmap vmlinux System.map | |
265 | ||
266 | # step a (see comment above) | |
267 | if [ -n "${CONFIG_KALLSYMS}" ]; then | |
268 | mksysmap ${kallsyms_vmlinux} .tmp_System.map | |
269 | ||
270 | if ! cmp -s System.map .tmp_System.map; then | |
5369f550 | 271 | echo >&2 Inconsistent kallsyms data |
367e43c5 | 272 | echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround |
1f2bfbd0 SR |
273 | exit 1 |
274 | fi | |
275 | fi |