script:ftrace: Analyze suspend resume time of each driver
[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_HAVE_UNDERSCORE_SYMBOL_PREFIX}" ]; then
78                 kallsymopt="${kallsymopt} --symbol-prefix=_"
79         fi
80
81         if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
82                 kallsymopt="${kallsymopt} --all-symbols"
83         fi
84
85         kallsymopt="${kallsymopt} --page-offset=$CONFIG_PAGE_OFFSET"
86
87         local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL}               \
88                       ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
89
90         ${NM} -n ${1} | \
91                 scripts/kallsyms ${kallsymopt} | \
92                 ${CC} ${aflags} -c -o ${2} -x assembler-with-cpp -
93 }
94
95 # Create map file with all symbols from ${1}
96 # See mksymap for additional details
97 mksysmap()
98 {
99         ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
100 }
101
102 sortextable()
103 {
104         ${objtree}/scripts/sortextable ${1}
105 }
106
107 # Delete output files in case of error
108 trap cleanup SIGHUP SIGINT SIGQUIT SIGTERM ERR
109 cleanup()
110 {
111         rm -f .old_version
112         rm -f .tmp_System.map
113         rm -f .tmp_kallsyms*
114         rm -f .tmp_version
115         rm -f .tmp_vmlinux*
116         rm -f System.map
117         rm -f vmlinux
118         rm -f vmlinux.o
119 }
120
121 #
122 #
123 # Use "make V=1" to debug this script
124 case "${KBUILD_VERBOSE}" in
125 *1*)
126         set -x
127         ;;
128 esac
129
130 if [ "$1" = "clean" ]; then
131         cleanup
132         exit 0
133 fi
134
135 # We need access to CONFIG_ symbols
136 case "${KCONFIG_CONFIG}" in
137 */*)
138         . "${KCONFIG_CONFIG}"
139         ;;
140 *)
141         # Force using a file from the current directory
142         . "./${KCONFIG_CONFIG}"
143 esac
144
145 #link vmlinux.o
146 info LD vmlinux.o
147 modpost_link vmlinux.o
148
149 # modpost vmlinux.o to check for section mismatches
150 ${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
151
152 # Update version
153 info GEN .version
154 if [ ! -r .version ]; then
155         rm -f .version;
156         echo 1 >.version;
157 else
158         mv .version .old_version;
159         expr 0$(cat .old_version) + 1 >.version;
160 fi;
161
162 # final build of init/
163 ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init
164
165 kallsymso=""
166 kallsyms_vmlinux=""
167 if [ -n "${CONFIG_KALLSYMS}" ]; then
168
169         # kallsyms support
170         # Generate section listing all symbols and add it into vmlinux
171         # It's a three step process:
172         # 1)  Link .tmp_vmlinux1 so it has all symbols and sections,
173         #     but __kallsyms is empty.
174         #     Running kallsyms on that gives us .tmp_kallsyms1.o with
175         #     the right size
176         # 2)  Link .tmp_vmlinux2 so it now has a __kallsyms section of
177         #     the right size, but due to the added section, some
178         #     addresses have shifted.
179         #     From here, we generate a correct .tmp_kallsyms2.o
180         # 2a) We may use an extra pass as this has been necessary to
181         #     woraround some alignment related bugs.
182         #     KALLSYMS_EXTRA_PASS=1 is used to trigger this.
183         # 3)  The correct ${kallsymso} is linked into the final vmlinux.
184         #
185         # a)  Verify that the System.map from vmlinux matches the map from
186         #     ${kallsymso}.
187
188         kallsymso=.tmp_kallsyms2.o
189         kallsyms_vmlinux=.tmp_vmlinux2
190
191         # step 1
192         vmlinux_link "" .tmp_vmlinux1
193         kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
194
195         # step 2
196         vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2
197         kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
198
199         # step 2a
200         if [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
201                 kallsymso=.tmp_kallsyms3.o
202                 kallsyms_vmlinux=.tmp_vmlinux3
203
204                 vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3
205
206                 kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
207         fi
208 fi
209
210 info LD vmlinux
211 vmlinux_link "${kallsymso}" vmlinux
212
213 if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
214         info SORTEX vmlinux
215         sortextable vmlinux
216 fi
217
218 info SYSMAP System.map
219 mksysmap vmlinux System.map
220
221 # step a (see comment above)
222 if [ -n "${CONFIG_KALLSYMS}" ]; then
223         mksysmap ${kallsyms_vmlinux} .tmp_System.map
224
225         if ! cmp -s System.map .tmp_System.map; then
226                 echo >&2 Inconsistent kallsyms data
227                 echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
228                 cleanup
229                 exit 1
230         fi
231 fi
232
233 # We made a new kernel - delete old version file
234 rm -f .old_version