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}" ] && [ -z "${CONFIG_XIP_KERNEL}" ] && [ -n "${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 114cleanup() 115{ 116 rm -f .old_version 117 rm -f .tmp_System.map 118 rm -f .tmp_kallsyms* 119 rm -f .tmp_version 120 rm -f .tmp_vmlinux* 121 rm -f System.map 122 rm -f vmlinux 123 rm -f vmlinux.o 124} 125 126on_exit() 127{ 128 if [ $? -ne 0 ]; then 129 cleanup 130 fi 131} 132trap on_exit EXIT 133 134on_signals() 135{ 136 exit 1 137} 138trap on_signals HUP INT QUIT TERM 139 140# 141# 142# Use "make V=1" to debug this script 143case "${KBUILD_VERBOSE}" in 144*1*) 145 set -x 146 ;; 147esac 148 149if [ "$1" = "clean" ]; then 150 cleanup 151 exit 0 152fi 153 154# We need access to CONFIG_ symbols 155case "${KCONFIG_CONFIG}" in 156*/*) 157 . "${KCONFIG_CONFIG}" 158 ;; 159*) 160 # Force using a file from the current directory 161 . "./${KCONFIG_CONFIG}" 162esac 163 164#link vmlinux.o 165info LD vmlinux.o 166modpost_link vmlinux.o 167 168# modpost vmlinux.o to check for section mismatches 169${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o 170 171# Update version 172info GEN .version 173if [ ! -r .version ]; then 174 rm -f .version; 175 echo 1 >.version; 176else 177 mv .version .old_version; 178 expr 0$(cat .old_version) + 1 >.version; 179fi; 180 181# final build of init/ 182${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init 183 184kallsymso="" 185kallsyms_vmlinux="" 186if [ -n "${CONFIG_KALLSYMS}" ]; then 187 188 # kallsyms support 189 # Generate section listing all symbols and add it into vmlinux 190 # It's a three step process: 191 # 1) Link .tmp_vmlinux1 so it has all symbols and sections, 192 # but __kallsyms is empty. 193 # Running kallsyms on that gives us .tmp_kallsyms1.o with 194 # the right size 195 # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of 196 # the right size, but due to the added section, some 197 # addresses have shifted. 198 # From here, we generate a correct .tmp_kallsyms2.o 199 # 2a) We may use an extra pass as this has been necessary to 200 # woraround some alignment related bugs. 201 # KALLSYMS_EXTRA_PASS=1 is used to trigger this. 202 # 3) The correct ${kallsymso} is linked into the final vmlinux. 203 # 204 # a) Verify that the System.map from vmlinux matches the map from 205 # ${kallsymso}. 206 207 kallsymso=.tmp_kallsyms2.o 208 kallsyms_vmlinux=.tmp_vmlinux2 209 210 # step 1 211 vmlinux_link "" .tmp_vmlinux1 212 kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o 213 214 # step 2 215 vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2 216 kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o 217 218 # step 2a 219 if [ -n "${KALLSYMS_EXTRA_PASS}" ]; then 220 kallsymso=.tmp_kallsyms3.o 221 kallsyms_vmlinux=.tmp_vmlinux3 222 223 vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3 224 225 kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o 226 fi 227fi 228 229info LD vmlinux 230vmlinux_link "${kallsymso}" vmlinux 231 232if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then 233 info SORTEX vmlinux 234 sortextable vmlinux 235fi 236 237info SYSMAP System.map 238mksysmap vmlinux System.map 239 240# step a (see comment above) 241if [ -n "${CONFIG_KALLSYMS}" ]; then 242 mksysmap ${kallsyms_vmlinux} .tmp_System.map 243 244 if ! cmp -s System.map .tmp_System.map; then 245 echo >&2 Inconsistent kallsyms data 246 echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround 247 exit 1 248 fi 249fi 250 251# We made a new kernel - delete old version file 252rm -f .old_version 253