projects/linux·blob v4.9-rc8 · refs

302 lines · 6.6 KiB

1#!/bin/sh
2#
3# link vmlinux
4#
5# vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_INIT) and
6# $(KBUILD_VMLINUX_MAIN). Most are built-in.o files from top-level directories
7# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
8# Ordering when linking is important, and $(KBUILD_VMLINUX_INIT) must be first.
9#
10# vmlinux
11# ^
12# |
13# +-< $(KBUILD_VMLINUX_INIT)
14# | +--< init/version.o + more
15# |
16# +--< $(KBUILD_VMLINUX_MAIN)
17# | +--< drivers/built-in.o mm/built-in.o + more
18# |
19# +-< ${kallsymso} (see description in KALLSYMS section)
20#
21# vmlinux version (uname -v) cannot be updated during normal
22# descending-into-subdirs phase since we do not yet know if we need to
23# update vmlinux.
24# Therefore this step is delayed until just before final link of vmlinux.
25#
26# System.map is generated to document addresses of all kernel symbols
27
28# Error out on error
29set -e
30
31# Nice output in kbuild format
32# Will be supressed by "make -s"
33info()
34{
35 if [ "${quiet}" != "silent_" ]; then
36 printf " %-7s %s\n" ${1} ${2}
37 fi
38}
39
40# Thin archive build here makes a final archive with
41# symbol table and indexes from vmlinux objects, which can be
42# used as input to linker.
43#
44# Traditional incremental style of link does not require this step
45#
46# built-in.o output file
47#
48archive_builtin()
49{
50 if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
51 info AR built-in.o
52 rm -f built-in.o;
53 ${AR} rcsT${KBUILD_ARFLAGS} built-in.o \
54 ${KBUILD_VMLINUX_INIT} \
55 ${KBUILD_VMLINUX_MAIN}
56 fi
57}
58
59# Link of vmlinux.o used for section mismatch analysis
60# ${1} output file
61modpost_link()
62{
63 local objects
64
65 if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
66 objects="--whole-archive built-in.o"
67 else
68 objects="${KBUILD_VMLINUX_INIT} \
69 --start-group \
70 ${KBUILD_VMLINUX_MAIN} \
71 --end-group"
72 fi
73 ${LD} ${LDFLAGS} -r -o ${1} ${objects}
74}
75
76# Link of vmlinux
77# ${1} - optional extra .o files
78# ${2} - output file
79vmlinux_link()
80{
81 local lds="${objtree}/${KBUILD_LDS}"
82 local objects
83
84 if [ "${SRCARCH}" != "um" ]; then
85 if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
86 objects="--whole-archive built-in.o ${1}"
87 else
88 objects="${KBUILD_VMLINUX_INIT} \
89 --start-group \
90 ${KBUILD_VMLINUX_MAIN} \
91 --end-group \
92 ${1}"
93 fi
94
95 ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} \
96 -T ${lds} ${objects}
97 else
98 if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
99 objects="-Wl,--whole-archive built-in.o ${1}"
100 else
101 objects="${KBUILD_VMLINUX_INIT} \
102 -Wl,--start-group \
103 ${KBUILD_VMLINUX_MAIN} \
104 -Wl,--end-group \
105 ${1}"
106 fi
107
108 ${CC} ${CFLAGS_vmlinux} -o ${2} \
109 -Wl,-T,${lds} \
110 ${objects} \
111 -lutil -lrt -lpthread
112 rm -f linux
113 fi
114}
115
116
117# Create ${2} .o file with all symbols from the ${1} object file
118kallsyms()
119{
120 info KSYM ${2}
121 local kallsymopt;
122
123 if [ -n "${CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX}" ]; then
124 kallsymopt="${kallsymopt} --symbol-prefix=_"
125 fi
126
127 if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
128 kallsymopt="${kallsymopt} --all-symbols"
129 fi
130
131 if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then
132 kallsymopt="${kallsymopt} --absolute-percpu"
133 fi
134
135 if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then
136 kallsymopt="${kallsymopt} --base-relative"
137 fi
138
139 local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
140 ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
141
142 local afile="`basename ${2} .o`.S"
143
144 ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile}
145 ${CC} ${aflags} -c -o ${2} ${afile}
146}
147
148# Create map file with all symbols from ${1}
149# See mksymap for additional details
150mksysmap()
151{
152 ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
153}
154
155sortextable()
156{
157 ${objtree}/scripts/sortextable ${1}
158}
159
160# Delete output files in case of error
161cleanup()
162{
163 rm -f .old_version
164 rm -f .tmp_System.map
165 rm -f .tmp_kallsyms*
166 rm -f .tmp_version
167 rm -f .tmp_vmlinux*
168 rm -f built-in.o
169 rm -f System.map
170 rm -f vmlinux
171 rm -f vmlinux.o
172}
173
174on_exit()
175{
176 if [ $? -ne 0 ]; then
177 cleanup
178 fi
179}
180trap on_exit EXIT
181
182on_signals()
183{
184 exit 1
185}
186trap on_signals HUP INT QUIT TERM
187
188#
189#
190# Use "make V=1" to debug this script
191case "${KBUILD_VERBOSE}" in
192*1*)
193 set -x
194 ;;
195esac
196
197if [ "$1" = "clean" ]; then
198 cleanup
199 exit 0
200fi
201
202# We need access to CONFIG_ symbols
203case "${KCONFIG_CONFIG}" in
204*/*)
205 . "${KCONFIG_CONFIG}"
206 ;;
207*)
208 # Force using a file from the current directory
209 . "./${KCONFIG_CONFIG}"
210esac
211
212archive_builtin
213
214#link vmlinux.o
215info LD vmlinux.o
216modpost_link vmlinux.o
217
218# modpost vmlinux.o to check for section mismatches
219${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
220
221# Update version
222info GEN .version
223if [ ! -r .version ]; then
224 rm -f .version;
225 echo 1 >.version;
226else
227 mv .version .old_version;
228 expr 0$(cat .old_version) + 1 >.version;
229fi;
230
231# final build of init/
232${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init GCC_PLUGINS_CFLAGS="${GCC_PLUGINS_CFLAGS}"
233
234kallsymso=""
235kallsyms_vmlinux=""
236if [ -n "${CONFIG_KALLSYMS}" ]; then
237
238 # kallsyms support
239 # Generate section listing all symbols and add it into vmlinux
240 # It's a three step process:
241 # 1) Link .tmp_vmlinux1 so it has all symbols and sections,
242 # but __kallsyms is empty.
243 # Running kallsyms on that gives us .tmp_kallsyms1.o with
244 # the right size
245 # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of
246 # the right size, but due to the added section, some
247 # addresses have shifted.
248 # From here, we generate a correct .tmp_kallsyms2.o
249 # 2a) We may use an extra pass as this has been necessary to
250 # woraround some alignment related bugs.
251 # KALLSYMS_EXTRA_PASS=1 is used to trigger this.
252 # 3) The correct ${kallsymso} is linked into the final vmlinux.
253 #
254 # a) Verify that the System.map from vmlinux matches the map from
255 # ${kallsymso}.
256
257 kallsymso=.tmp_kallsyms2.o
258 kallsyms_vmlinux=.tmp_vmlinux2
259
260 # step 1
261 vmlinux_link "" .tmp_vmlinux1
262 kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
263
264 # step 2
265 vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2
266 kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
267
268 # step 2a
269 if [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
270 kallsymso=.tmp_kallsyms3.o
271 kallsyms_vmlinux=.tmp_vmlinux3
272
273 vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3
274
275 kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
276 fi
277fi
278
279info LD vmlinux
280vmlinux_link "${kallsymso}" vmlinux
281
282if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
283 info SORTEX vmlinux
284 sortextable vmlinux
285fi
286
287info SYSMAP System.map
288mksysmap vmlinux System.map
289
290# step a (see comment above)
291if [ -n "${CONFIG_KALLSYMS}" ]; then
292 mksysmap ${kallsyms_vmlinux} .tmp_System.map
293
294 if ! cmp -s System.map .tmp_System.map; then
295 echo >&2 Inconsistent kallsyms data
296 echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
297 exit 1
298 fi
299fi
300
301# We made a new kernel - delete old version file
302rm -f .old_version