blob: 014994936b1c2152c82f793ce646342159d78eb5 [file] [log] [blame]
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +02001#!/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 ${2}
75 local kallsymopt;
76
Rusty Russellb92021b2013-03-15 15:04:17 +103077 if [ -n "${CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX}" ]; then
78 kallsymopt="${kallsymopt} --symbol-prefix=_"
James Hogan6895f972012-09-06 22:11:25 +010079 fi
80
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +020081 if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
James Hogan6895f972012-09-06 22:11:25 +010082 kallsymopt="${kallsymopt} --all-symbols"
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +020083 fi
84
Sam Ravnborg00e6c28c2012-05-08 19:53:46 +020085 local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
86 ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +020087
88 ${NM} -n ${1} | \
89 scripts/kallsyms ${kallsymopt} | \
90 ${CC} ${aflags} -c -o ${2} -x assembler-with-cpp -
91}
92
93# Create map file with all symbols from ${1}
94# See mksymap for additional details
95mksysmap()
96{
97 ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
98}
99
Linus Torvalds1347a2ce2012-05-28 10:32:28 -0700100sortextable()
101{
102 ${objtree}/scripts/sortextable ${1}
103}
104
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200105# Delete output files in case of error
106trap cleanup SIGHUP SIGINT SIGQUIT SIGTERM ERR
107cleanup()
108{
109 rm -f .old_version
110 rm -f .tmp_System.map
111 rm -f .tmp_kallsyms*
112 rm -f .tmp_version
113 rm -f .tmp_vmlinux*
114 rm -f System.map
115 rm -f vmlinux
116 rm -f vmlinux.o
117}
118
119#
120#
121# Use "make V=1" to debug this script
122case "${KBUILD_VERBOSE}" in
123*1*)
124 set -x
125 ;;
126esac
127
128if [ "$1" = "clean" ]; then
129 cleanup
130 exit 0
131fi
132
133# We need access to CONFIG_ symbols
Michal Marek423a8152013-02-25 13:47:53 +0100134case "${KCONFIG_CONFIG}" in
135*/*)
136 . "${KCONFIG_CONFIG}"
137 ;;
138*)
139 # Force using a file from the current directory
140 . "./${KCONFIG_CONFIG}"
141esac
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200142
143#link vmlinux.o
144info LD vmlinux.o
145modpost_link vmlinux.o
146
147# modpost vmlinux.o to check for section mismatches
148${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
149
150# Update version
151info GEN .version
152if [ ! -r .version ]; then
153 rm -f .version;
154 echo 1 >.version;
155else
156 mv .version .old_version;
157 expr 0$(cat .old_version) + 1 >.version;
158fi;
159
160# final build of init/
161${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init
162
163kallsymso=""
164kallsyms_vmlinux=""
165if [ -n "${CONFIG_KALLSYMS}" ]; then
166
167 # kallsyms support
168 # Generate section listing all symbols and add it into vmlinux
169 # It's a three step process:
170 # 1) Link .tmp_vmlinux1 so it has all symbols and sections,
171 # but __kallsyms is empty.
172 # Running kallsyms on that gives us .tmp_kallsyms1.o with
173 # the right size
174 # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of
175 # the right size, but due to the added section, some
176 # addresses have shifted.
177 # From here, we generate a correct .tmp_kallsyms2.o
178 # 2a) We may use an extra pass as this has been necessary to
179 # woraround some alignment related bugs.
180 # KALLSYMS_EXTRA_PASS=1 is used to trigger this.
181 # 3) The correct ${kallsymso} is linked into the final vmlinux.
182 #
183 # a) Verify that the System.map from vmlinux matches the map from
184 # ${kallsymso}.
185
186 kallsymso=.tmp_kallsyms2.o
187 kallsyms_vmlinux=.tmp_vmlinux2
188
189 # step 1
190 vmlinux_link "" .tmp_vmlinux1
191 kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
192
193 # step 2
194 vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2
195 kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
196
197 # step 2a
198 if [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
199 kallsymso=.tmp_kallsyms3.o
200 kallsyms_vmlinux=.tmp_vmlinux3
201
202 vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3
203
204 kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
205 fi
206fi
207
208info LD vmlinux
209vmlinux_link "${kallsymso}" vmlinux
210
Linus Torvalds1347a2ce2012-05-28 10:32:28 -0700211if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
212 info SORTEX vmlinux
213 sortextable vmlinux
214fi
215
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200216info SYSMAP System.map
217mksysmap vmlinux System.map
218
219# step a (see comment above)
220if [ -n "${CONFIG_KALLSYMS}" ]; then
221 mksysmap ${kallsyms_vmlinux} .tmp_System.map
222
223 if ! cmp -s System.map .tmp_System.map; then
Michal Marek5369f552012-07-07 23:04:40 +0200224 echo >&2 Inconsistent kallsyms data
Michal Marek367e43c2012-08-10 11:55:11 +0200225 echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200226 cleanup
227 exit 1
228 fi
229fi
230
231# We made a new kernel - delete old version file
232rm -f .old_version