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