Root/scripts/link-vmlinux.sh

Source at commit cdde9cf73945d547acd3e96f9508c79e84ad0bf1 created 9 years 4 months ago.
By Maarten ter Huurne, MMC: JZ4740: Added support for CPU frequency changing
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 [ "$1" = "clean" ]; then
130    cleanup
131    exit 0
132fi
133
134# We need access to CONFIG_ symbols
135. ./.config
136
137#link vmlinux.o
138info LD vmlinux.o
139modpost_link vmlinux.o
140
141# modpost vmlinux.o to check for section mismatches
142${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
143
144# Update version
145info GEN .version
146if [ ! -r .version ]; then
147    rm -f .version;
148    echo 1 >.version;
149else
150    mv .version .old_version;
151    expr 0$(cat .old_version) + 1 >.version;
152fi;
153
154# final build of init/
155${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init
156
157kallsymso=""
158kallsyms_vmlinux=""
159if [ -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
200fi
201
202info LD vmlinux
203vmlinux_link "${kallsymso}" vmlinux
204
205if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
206    info SORTEX vmlinux
207    sortextable vmlinux
208fi
209
210info SYSMAP System.map
211mksysmap vmlinux System.map
212
213# step a (see comment above)
214if [ -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
223fi
224
225# We made a new kernel - delete old version file
226rm -f .old_version
227

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