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