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=$CONFIG_PAGE_OFFSET" 87 fi 88 89 if [ -n "${CONFIG_X86_64}" ]; then 90 kallsymopt="${kallsymopt} --absolute-percpu" 91 fi 92 93 local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ 94 ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}" 95 96 ${NM} -n ${1} | \ 97 scripts/kallsyms ${kallsymopt} | \ 98 ${CC} ${aflags} -c -o ${2} -x assembler-with-cpp - 99} 100 101# Create map file with all symbols from ${1} 102# See mksymap for additional details 103mksysmap() 104{ 105 ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} 106} 107 108sortextable() 109{ 110 ${objtree}/scripts/sortextable ${1} 111} 112 113# Delete output files in case of error 114trap cleanup SIGHUP SIGINT SIGQUIT SIGTERM ERR 115cleanup() 116{ 117 rm -f .old_version 118 rm -f .tmp_System.map 119 rm -f .tmp_kallsyms* 120 rm -f .tmp_version 121 rm -f .tmp_vmlinux* 122 rm -f System.map 123 rm -f vmlinux 124 rm -f vmlinux.o 125} 126 127# 128# 129# Use "make V=1" to debug this script 130case "${KBUILD_VERBOSE}" in 131*1*) 132 set -x 133 ;; 134esac 135 136if [ "$1" = "clean" ]; then 137 cleanup 138 exit 0 139fi 140 141# We need access to CONFIG_ symbols 142case "${KCONFIG_CONFIG}" in 143*/*) 144 . "${KCONFIG_CONFIG}" 145 ;; 146*) 147 # Force using a file from the current directory 148 . "./${KCONFIG_CONFIG}" 149esac 150 151#link vmlinux.o 152info LD vmlinux.o 153modpost_link vmlinux.o 154 155# modpost vmlinux.o to check for section mismatches 156${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o 157 158# Update version 159info GEN .version 160if [ ! -r .version ]; then 161 rm -f .version; 162 echo 1 >.version; 163else 164 mv .version .old_version; 165 expr 0$(cat .old_version) + 1 >.version; 166fi; 167 168# final build of init/ 169${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init 170 171kallsymso="" 172kallsyms_vmlinux="" 173if [ -n "${CONFIG_KALLSYMS}" ]; then 174 175 # kallsyms support 176 # Generate section listing all symbols and add it into vmlinux 177 # It's a three step process: 178 # 1) Link .tmp_vmlinux1 so it has all symbols and sections, 179 # but __kallsyms is empty. 180 # Running kallsyms on that gives us .tmp_kallsyms1.o with 181 # the right size 182 # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of 183 # the right size, but due to the added section, some 184 # addresses have shifted. 185 # From here, we generate a correct .tmp_kallsyms2.o 186 # 2a) We may use an extra pass as this has been necessary to 187 # woraround some alignment related bugs. 188 # KALLSYMS_EXTRA_PASS=1 is used to trigger this. 189 # 3) The correct ${kallsymso} is linked into the final vmlinux. 190 # 191 # a) Verify that the System.map from vmlinux matches the map from 192 # ${kallsymso}. 193 194 kallsymso=.tmp_kallsyms2.o 195 kallsyms_vmlinux=.tmp_vmlinux2 196 197 # step 1 198 vmlinux_link "" .tmp_vmlinux1 199 kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o 200 201 # step 2 202 vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2 203 kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o 204 205 # step 2a 206 if [ -n "${KALLSYMS_EXTRA_PASS}" ]; then 207 kallsymso=.tmp_kallsyms3.o 208 kallsyms_vmlinux=.tmp_vmlinux3 209 210 vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3 211 212 kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o 213 fi 214fi 215 216info LD vmlinux 217vmlinux_link "${kallsymso}" vmlinux 218 219if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then 220 info SORTEX vmlinux 221 sortextable vmlinux 222fi 223 224info SYSMAP System.map 225mksysmap vmlinux System.map 226 227# step a (see comment above) 228if [ -n "${CONFIG_KALLSYMS}" ]; then 229 mksysmap ${kallsyms_vmlinux} .tmp_System.map 230 231 if ! cmp -s System.map .tmp_System.map; then 232 echo >&2 Inconsistent kallsyms data 233 echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround 234 cleanup 235 exit 1 236 fi 237fi 238 239# We made a new kernel - delete old version file 240rm -f .old_version 241