linux/scripts/link-vmlinux.sh
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   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 -lrt -lpthread ${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_HAVE_UNDERSCORE_SYMBOL_PREFIX}" ]; then
  78                kallsymopt="${kallsymopt} --symbol-prefix=_"
  79        fi
  80
  81        if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
  82                kallsymopt="${kallsymopt} --all-symbols"
  83        fi
  84
  85        if [ -n "${CONFIG_ARM}" ] && [ -z "${CONFIG_XIP_KERNEL}" ] && [ -n "${CONFIG_PAGE_OFFSET}" ]; then
  86                kallsymopt="${kallsymopt} --page-offset=$CONFIG_PAGE_OFFSET"
  87        fi
  88
  89        if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then
  90                kallsymopt="${kallsymopt} --absolute-percpu"
  91        fi
  92
  93        if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then
  94                kallsymopt="${kallsymopt} --base-relative"
  95        fi
  96
  97        local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL}               \
  98                      ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
  99
 100        local afile="`basename ${2} .o`.S"
 101
 102        ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile}
 103        ${CC} ${aflags} -c -o ${2} ${afile}
 104}
 105
 106# Create map file with all symbols from ${1}
 107# See mksymap for additional details
 108mksysmap()
 109{
 110        ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
 111}
 112
 113sortextable()
 114{
 115        ${objtree}/scripts/sortextable ${1}
 116}
 117
 118# Delete output files in case of error
 119cleanup()
 120{
 121        rm -f .old_version
 122        rm -f .tmp_System.map
 123        rm -f .tmp_kallsyms*
 124        rm -f .tmp_version
 125        rm -f .tmp_vmlinux*
 126        rm -f System.map
 127        rm -f vmlinux
 128        rm -f vmlinux.o
 129}
 130
 131on_exit()
 132{
 133        if [ $? -ne 0 ]; then
 134                cleanup
 135        fi
 136}
 137trap on_exit EXIT
 138
 139on_signals()
 140{
 141        exit 1
 142}
 143trap on_signals HUP INT QUIT TERM
 144
 145#
 146#
 147# Use "make V=1" to debug this script
 148case "${KBUILD_VERBOSE}" in
 149*1*)
 150        set -x
 151        ;;
 152esac
 153
 154if [ "$1" = "clean" ]; then
 155        cleanup
 156        exit 0
 157fi
 158
 159# We need access to CONFIG_ symbols
 160case "${KCONFIG_CONFIG}" in
 161*/*)
 162        . "${KCONFIG_CONFIG}"
 163        ;;
 164*)
 165        # Force using a file from the current directory
 166        . "./${KCONFIG_CONFIG}"
 167esac
 168
 169#link vmlinux.o
 170info LD vmlinux.o
 171modpost_link vmlinux.o
 172
 173# modpost vmlinux.o to check for section mismatches
 174${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
 175
 176# Update version
 177info GEN .version
 178if [ ! -r .version ]; then
 179        rm -f .version;
 180        echo 1 >.version;
 181else
 182        mv .version .old_version;
 183        expr 0$(cat .old_version) + 1 >.version;
 184fi;
 185
 186# final build of init/
 187${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init
 188
 189kallsymso=""
 190kallsyms_vmlinux=""
 191if [ -n "${CONFIG_KALLSYMS}" ]; then
 192
 193        # kallsyms support
 194        # Generate section listing all symbols and add it into vmlinux
 195        # It's a three step process:
 196        # 1)  Link .tmp_vmlinux1 so it has all symbols and sections,
 197        #     but __kallsyms is empty.
 198        #     Running kallsyms on that gives us .tmp_kallsyms1.o with
 199        #     the right size
 200        # 2)  Link .tmp_vmlinux2 so it now has a __kallsyms section of
 201        #     the right size, but due to the added section, some
 202        #     addresses have shifted.
 203        #     From here, we generate a correct .tmp_kallsyms2.o
 204        # 2a) We may use an extra pass as this has been necessary to
 205        #     woraround some alignment related bugs.
 206        #     KALLSYMS_EXTRA_PASS=1 is used to trigger this.
 207        # 3)  The correct ${kallsymso} is linked into the final vmlinux.
 208        #
 209        # a)  Verify that the System.map from vmlinux matches the map from
 210        #     ${kallsymso}.
 211
 212        kallsymso=.tmp_kallsyms2.o
 213        kallsyms_vmlinux=.tmp_vmlinux2
 214
 215        # step 1
 216        vmlinux_link "" .tmp_vmlinux1
 217        kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
 218
 219        # step 2
 220        vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2
 221        kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
 222
 223        # step 2a
 224        if [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
 225                kallsymso=.tmp_kallsyms3.o
 226                kallsyms_vmlinux=.tmp_vmlinux3
 227
 228                vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3
 229
 230                kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
 231        fi
 232fi
 233
 234info LD vmlinux
 235vmlinux_link "${kallsymso}" vmlinux
 236
 237if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
 238        info SORTEX vmlinux
 239        sortextable vmlinux
 240fi
 241
 242info SYSMAP System.map
 243mksysmap vmlinux System.map
 244
 245# step a (see comment above)
 246if [ -n "${CONFIG_KALLSYMS}" ]; then
 247        mksysmap ${kallsyms_vmlinux} .tmp_System.map
 248
 249        if ! cmp -s System.map .tmp_System.map; then
 250                echo >&2 Inconsistent kallsyms data
 251                echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
 252                exit 1
 253        fi
 254fi
 255
 256# We made a new kernel - delete old version file
 257rm -f .old_version
 258