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