scripts/coccinelle: find constant additions that could be bit ors
[linux-3.10.git] / scripts / link-vmlinux.sh
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 #   +-< ${kallsymso} (see description in KALLSYMS section)
20 #
21 # vmlinux version (uname -v) cannot be updated during normal
22 # descending-into-subdirs phase since we do not yet know if we need to
23 # update vmlinux.
24 # Therefore this step is delayed until just before final link of vmlinux.
25 #
26 # System.map is generated to document addresses of all kernel symbols
27
28 # Error out on error
29 set -e
30
31 # Nice output in kbuild format
32 # Will be supressed by "make -s"
33 info()
34 {
35         if [ "${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
42 modpost_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 # ${2} - output file
51 vmlinux_link()
52 {
53         local lds="${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
72 kallsyms()
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
96 mksysmap()
97 {
98         ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
99 }
100
101 sortextable()
102 {
103         ${objtree}/scripts/sortextable ${1}
104 }
105
106 # Delete output files in case of error
107 trap cleanup SIGHUP SIGINT SIGQUIT SIGTERM ERR
108 cleanup()
109 {
110         rm -f .old_version
111         rm -f .tmp_System.map
112         rm -f .tmp_kallsyms*
113         rm -f .tmp_version
114         rm -f .tmp_vmlinux*
115         rm -f System.map
116         rm -f vmlinux
117         rm -f vmlinux.o
118 }
119
120 #
121 #
122 # Use "make V=1" to debug this script
123 case "${KBUILD_VERBOSE}" in
124 *1*)
125         set -x
126         ;;
127 esac
128
129 if [ "$1" = "clean" ]; then
130         cleanup
131         exit 0
132 fi
133
134 # We need access to CONFIG_ symbols
135 . ./.config
136
137 #link vmlinux.o
138 info LD vmlinux.o
139 modpost_link vmlinux.o
140
141 # modpost vmlinux.o to check for section mismatches
142 ${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
143
144 # Update version
145 info GEN .version
146 if [ ! -r .version ]; then
147         rm -f .version;
148         echo 1 >.version;
149 else
150         mv .version .old_version;
151         expr 0$(cat .old_version) + 1 >.version;
152 fi;
153
154 # final build of init/
155 ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init
156
157 kallsymso=""
158 kallsyms_vmlinux=""
159 if [ -n "${CONFIG_KALLSYMS}" ]; then
160
161         # kallsyms support
162         # Generate section listing all symbols and add it into vmlinux
163         # It's a three step process:
164         # 1)  Link .tmp_vmlinux1 so it has all symbols and sections,
165         #     but __kallsyms is empty.
166         #     Running kallsyms on that gives us .tmp_kallsyms1.o with
167         #     the right size
168         # 2)  Link .tmp_vmlinux2 so it now has a __kallsyms section of
169         #     the right size, but due to the added section, some
170         #     addresses have shifted.
171         #     From here, we generate a correct .tmp_kallsyms2.o
172         # 2a) We may use an extra pass as this has been necessary to
173         #     woraround some alignment related bugs.
174         #     KALLSYMS_EXTRA_PASS=1 is used to trigger this.
175         # 3)  The correct ${kallsymso} is linked into the final vmlinux.
176         #
177         # a)  Verify that the System.map from vmlinux matches the map from
178         #     ${kallsymso}.
179
180         kallsymso=.tmp_kallsyms2.o
181         kallsyms_vmlinux=.tmp_vmlinux2
182
183         # step 1
184         vmlinux_link "" .tmp_vmlinux1
185         kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
186
187         # step 2
188         vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2
189         kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
190
191         # step 2a
192         if [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
193                 kallsymso=.tmp_kallsyms3.o
194                 kallsyms_vmlinux=.tmp_vmlinux3
195
196                 vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3
197
198                 kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
199         fi
200 fi
201
202 info LD vmlinux
203 vmlinux_link "${kallsymso}" vmlinux
204
205 if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
206         info SORTEX vmlinux
207         sortextable vmlinux
208 fi
209
210 info SYSMAP System.map
211 mksysmap vmlinux System.map
212
213 # step a (see comment above)
214 if [ -n "${CONFIG_KALLSYMS}" ]; then
215         mksysmap ${kallsyms_vmlinux} .tmp_System.map
216
217         if ! cmp -s System.map .tmp_System.map; then
218                 echo >&2 Inconsistent kallsyms data
219                 echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
220                 cleanup
221                 exit 1
222         fi
223 fi
224
225 # We made a new kernel - delete old version file
226 rm -f .old_version