projects/linux·blob v3.9-rc6 · refs

233 lines · 5.5 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# Link of vmlinux.o used for section mismatch analysis
41# ${1} output file
42modpost_link()
43{
44 ${LD} ${LDFLAGS} -r -o ${1} ${KBUILD_VMLINUX_INIT} \
45 --start-group ${KBUILD_VMLINUX_MAIN} --end-group
46}
47
48# Link of vmlinux
49# ${1} - optional extra .o files
50# ${2} - output file
51vmlinux_link()
52{
53 local lds="${objtree}/${KBUILD_LDS}"
54
55 if [ "${SRCARCH}" != "um" ]; then
56 ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} \
57 -T ${lds} ${KBUILD_VMLINUX_INIT} \
58 --start-group ${KBUILD_VMLINUX_MAIN} --end-group ${1}
59 else
60 ${CC} ${CFLAGS_vmlinux} -o ${2} \
61 -Wl,-T,${lds} ${KBUILD_VMLINUX_INIT} \
62 -Wl,--start-group \
63 ${KBUILD_VMLINUX_MAIN} \
64 -Wl,--end-group \
65 -lutil ${1}
66 rm -f linux
67 fi
68}
69
70
71# Create ${2} .o file with all symbols from the ${1} object file
72kallsyms()
73{
74 info KSYM ${2}
75 local kallsymopt;
76
77 if [ -n "${CONFIG_SYMBOL_PREFIX}" ]; then
78 kallsymopt="${kallsymopt} \
79 --symbol-prefix=${CONFIG_SYMBOL_PREFIX}"
80 fi
81
82 if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
83 kallsymopt="${kallsymopt} --all-symbols"
84 fi
85
86 local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
87 ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
88
89 ${NM} -n ${1} | \
90 scripts/kallsyms ${kallsymopt} | \
91 ${CC} ${aflags} -c -o ${2} -x assembler-with-cpp -
92}
93
94# Create map file with all symbols from ${1}
95# See mksymap for additional details
96mksysmap()
97{
98 ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
99}
100
101sortextable()
102{
103 ${objtree}/scripts/sortextable ${1}
104}
105
106# Delete output files in case of error
107trap cleanup SIGHUP SIGINT SIGQUIT SIGTERM ERR
108cleanup()
109{
110 rm -f .old_version
111 rm -f .tmp_System.map
112 rm -f .tmp_kallsyms*
113 rm -f .tmp_version
114 rm -f .tmp_vmlinux*
115 rm -f System.map
116 rm -f vmlinux
117 rm -f vmlinux.o
118}
119
120#
121#
122# Use "make V=1" to debug this script
123case "${KBUILD_VERBOSE}" in
124*1*)
125 set -x
126 ;;
127esac
128
129if [ "$1" = "clean" ]; then
130 cleanup
131 exit 0
132fi
133
134# We need access to CONFIG_ symbols
135case "${KCONFIG_CONFIG}" in
136*/*)
137 . "${KCONFIG_CONFIG}"
138 ;;
139*)
140 # Force using a file from the current directory
141 . "./${KCONFIG_CONFIG}"
142esac
143
144#link vmlinux.o
145info LD vmlinux.o
146modpost_link vmlinux.o
147
148# modpost vmlinux.o to check for section mismatches
149${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
150
151# Update version
152info GEN .version
153if [ ! -r .version ]; then
154 rm -f .version;
155 echo 1 >.version;
156else
157 mv .version .old_version;
158 expr 0$(cat .old_version) + 1 >.version;
159fi;
160
161# final build of init/
162${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init
163
164kallsymso=""
165kallsyms_vmlinux=""
166if [ -n "${CONFIG_KALLSYMS}" ]; then
167
168 # kallsyms support
169 # Generate section listing all symbols and add it into vmlinux
170 # It's a three step process:
171 # 1) Link .tmp_vmlinux1 so it has all symbols and sections,
172 # but __kallsyms is empty.
173 # Running kallsyms on that gives us .tmp_kallsyms1.o with
174 # the right size
175 # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of
176 # the right size, but due to the added section, some
177 # addresses have shifted.
178 # From here, we generate a correct .tmp_kallsyms2.o
179 # 2a) We may use an extra pass as this has been necessary to
180 # woraround some alignment related bugs.
181 # KALLSYMS_EXTRA_PASS=1 is used to trigger this.
182 # 3) The correct ${kallsymso} is linked into the final vmlinux.
183 #
184 # a) Verify that the System.map from vmlinux matches the map from
185 # ${kallsymso}.
186
187 kallsymso=.tmp_kallsyms2.o
188 kallsyms_vmlinux=.tmp_vmlinux2
189
190 # step 1
191 vmlinux_link "" .tmp_vmlinux1
192 kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
193
194 # step 2
195 vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2
196 kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
197
198 # step 2a
199 if [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
200 kallsymso=.tmp_kallsyms3.o
201 kallsyms_vmlinux=.tmp_vmlinux3
202
203 vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3
204
205 kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
206 fi
207fi
208
209info LD vmlinux
210vmlinux_link "${kallsymso}" vmlinux
211
212if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
213 info SORTEX vmlinux
214 sortextable vmlinux
215fi
216
217info SYSMAP System.map
218mksysmap vmlinux System.map
219
220# step a (see comment above)
221if [ -n "${CONFIG_KALLSYMS}" ]; then
222 mksysmap ${kallsyms_vmlinux} .tmp_System.map
223
224 if ! cmp -s System.map .tmp_System.map; then
225 echo >&2 Inconsistent kallsyms data
226 echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
227 cleanup
228 exit 1
229 fi
230fi
231
232# We made a new kernel - delete old version file
233rm -f .old_version