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 -lrt -lpthread ${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_KALLSYMS_ABSOLUTE_PERCPU}" ]; then 86 kallsymopt="${kallsymopt} --absolute-percpu" 87 fi 88 89 if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then 90 kallsymopt="${kallsymopt} --base-relative" 91 fi 92 93 local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ 94 ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}" 95 96 local afile="`basename ${2} .o`.S" 97 98 ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile} 99 ${CC} ${aflags} -c -o ${2} ${afile} 100} 101 102# Create map file with all symbols from ${1} 103# See mksymap for additional details 104mksysmap() 105{ 106 ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} 107} 108 109sortextable() 110{ 111 ${objtree}/scripts/sortextable ${1} 112} 113 114# Delete output files in case of error 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 127on_exit() 128{ 129 if [ $? -ne 0 ]; then 130 cleanup 131 fi 132} 133trap on_exit EXIT 134 135on_signals() 136{ 137 exit 1 138} 139trap on_signals HUP INT QUIT TERM 140 141# 142# 143# Use "make V=1" to debug this script 144case "${KBUILD_VERBOSE}" in 145*1*) 146 set -x 147 ;; 148esac 149 150if [ "$1" = "clean" ]; then 151 cleanup 152 exit 0 153fi 154 155# We need access to CONFIG_ symbols 156case "${KCONFIG_CONFIG}" in 157*/*) 158 . "${KCONFIG_CONFIG}" 159 ;; 160*) 161 # Force using a file from the current directory 162 . "./${KCONFIG_CONFIG}" 163esac 164 165#link vmlinux.o 166info LD vmlinux.o 167modpost_link vmlinux.o 168 169# modpost vmlinux.o to check for section mismatches 170${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o 171 172# Update version 173info GEN .version 174if [ ! -r .version ]; then 175 rm -f .version; 176 echo 1 >.version; 177else 178 mv .version .old_version; 179 expr 0$(cat .old_version) + 1 >.version; 180fi; 181 182# final build of init/ 183${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init GCC_PLUGINS_CFLAGS="${GCC_PLUGINS_CFLAGS}" 184 185kallsymso="" 186kallsyms_vmlinux="" 187if [ -n "${CONFIG_KALLSYMS}" ]; then 188 189 # kallsyms support 190 # Generate section listing all symbols and add it into vmlinux 191 # It's a three step process: 192 # 1) Link .tmp_vmlinux1 so it has all symbols and sections, 193 # but __kallsyms is empty. 194 # Running kallsyms on that gives us .tmp_kallsyms1.o with 195 # the right size 196 # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of 197 # the right size, but due to the added section, some 198 # addresses have shifted. 199 # From here, we generate a correct .tmp_kallsyms2.o 200 # 2a) We may use an extra pass as this has been necessary to 201 # woraround some alignment related bugs. 202 # KALLSYMS_EXTRA_PASS=1 is used to trigger this. 203 # 3) The correct ${kallsymso} is linked into the final vmlinux. 204 # 205 # a) Verify that the System.map from vmlinux matches the map from 206 # ${kallsymso}. 207 208 kallsymso=.tmp_kallsyms2.o 209 kallsyms_vmlinux=.tmp_vmlinux2 210 211 # step 1 212 vmlinux_link "" .tmp_vmlinux1 213 kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o 214 215 # step 2 216 vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2 217 kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o 218 219 # step 2a 220 if [ -n "${KALLSYMS_EXTRA_PASS}" ]; then 221 kallsymso=.tmp_kallsyms3.o 222 kallsyms_vmlinux=.tmp_vmlinux3 223 224 vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3 225 226 kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o 227 fi 228fi 229 230info LD vmlinux 231vmlinux_link "${kallsymso}" vmlinux 232 233if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then 234 info SORTEX vmlinux 235 sortextable vmlinux 236fi 237 238info SYSMAP System.map 239mksysmap vmlinux System.map 240 241# step a (see comment above) 242if [ -n "${CONFIG_KALLSYMS}" ]; then 243 mksysmap ${kallsyms_vmlinux} .tmp_System.map 244 245 if ! cmp -s System.map .tmp_System.map; then 246 echo >&2 Inconsistent kallsyms data 247 echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround 248 exit 1 249 fi 250fi 251 252# We made a new kernel - delete old version file 253rm -f .old_version 254