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Most are built-in.a files from top-level directories # in the kernel tree, others are specified in arch/$(ARCH)/Makefile. # $(KBUILD_VMLINUX_LIBS) are archives which are linked conditionally # (not within --whole-archive), and do not require symbol indexes added. # # vmlinux # ^ # | # +--< $(KBUILD_VMLINUX_OBJS) # | +--< init/built-in.a drivers/built-in.a mm/built-in.a + more # | # +--< $(KBUILD_VMLINUX_LIBS) # | +--< lib/lib.a + more # | # +-< ${kallsymso} (see description in KALLSYMS section) # # vmlinux version (uname -v) cannot be updated during normal # descending-into-subdirs phase since we do not yet know if we need to # update vmlinux. # Therefore this step is delayed until just before final link of vmlinux. # # System.map is generated to document addresses of all kernel symbols # Error out on error set -e # Nice output in kbuild format # Will be supressed by "make -s" info() { if [ "${quiet}" != "silent_" ]; then printf " %-7s %s\n" "${1}" "${2}" fi } # Link of vmlinux.o used for section mismatch analysis # ${1} output file modpost_link() { local objects objects="--whole-archive \ ${KBUILD_VMLINUX_OBJS} \ --no-whole-archive \ --start-group \ ${KBUILD_VMLINUX_LIBS} \ --end-group" ${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${objects} } # Link of vmlinux # ${1} - output file # ${2}, ${3}, ... - optional extra .o files vmlinux_link() { local lds="${objtree}/${KBUILD_LDS}" local output=${1} local objects info LD ${output} # skip output file argument shift if [ "${SRCARCH}" != "um" ]; then objects="--whole-archive \ ${KBUILD_VMLINUX_OBJS} \ --no-whole-archive \ --start-group \ ${KBUILD_VMLINUX_LIBS} \ --end-group \ ${@}" ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} \ -o ${output} \ -T ${lds} ${objects} else objects="-Wl,--whole-archive \ ${KBUILD_VMLINUX_OBJS} \ -Wl,--no-whole-archive \ -Wl,--start-group \ ${KBUILD_VMLINUX_LIBS} \ -Wl,--end-group \ ${@}" ${CC} ${CFLAGS_vmlinux} \ -o ${output} \ -Wl,-T,${lds} \ ${objects} \ -lutil -lrt -lpthread rm -f linux fi } # generate .BTF typeinfo from DWARF debuginfo # ${1} - vmlinux image # ${2} - file to dump raw BTF data into gen_btf() { local pahole_ver local bin_arch if ! [ -x "$(command -v ${PAHOLE})" ]; then echo >&2 "BTF: ${1}: pahole (${PAHOLE}) is not available" return 1 fi pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/') if [ "${pahole_ver}" -lt "113" ]; then echo >&2 "BTF: ${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.13" return 1 fi info "BTF" ${2} vmlinux_link ${1} LLVM_OBJCOPY=${OBJCOPY} ${PAHOLE} -J ${1} # dump .BTF section into raw binary file to link with final vmlinux bin_arch=$(LANG=C ${OBJDUMP} -f ${1} | grep architecture | \ cut -d, -f1 | cut -d' ' -f2) bin_format=$(LANG=C ${OBJDUMP} -f ${1} | grep 'file format' | \ awk '{print $4}') ${OBJCOPY} --change-section-address .BTF=0 \ --set-section-flags .BTF=alloc -O binary \ --only-section=.BTF ${1} .btf.vmlinux.bin ${OBJCOPY} -I binary -O ${bin_format} -B ${bin_arch} \ --rename-section .data=.BTF .btf.vmlinux.bin ${2} } # Create ${2} .o file with all symbols from the ${1} object file kallsyms() { info KSYM ${2} local kallsymopt; if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then kallsymopt="${kallsymopt} --all-symbols" fi if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then kallsymopt="${kallsymopt} --absolute-percpu" fi if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then kallsymopt="${kallsymopt} --base-relative" fi local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}" local afile="`basename ${2} .o`.S" ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile} ${CC} ${aflags} -c -o ${2} ${afile} } # Perform one step in kallsyms generation, including temporary linking of # vmlinux. kallsyms_step() { kallsymso_prev=${kallsymso} kallsymso=.tmp_kallsyms${1}.o kallsyms_vmlinux=.tmp_vmlinux${1} vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o} kallsyms ${kallsyms_vmlinux} ${kallsymso} } # Create map file with all symbols from ${1} # See mksymap for additional details mksysmap() { ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} } sortextable() { ${objtree}/scripts/sortextable ${1} } # Delete output files in case of error cleanup() { rm -f .btf.* rm -f .tmp_System.map rm -f .tmp_kallsyms* rm -f .tmp_vmlinux* rm -f System.map rm -f vmlinux rm -f vmlinux.o } on_exit() { if [ $? -ne 0 ]; then cleanup fi } trap on_exit EXIT on_signals() { exit 1 } trap on_signals HUP INT QUIT TERM # # # Use "make V=1" to debug this script case "${KBUILD_VERBOSE}" in *1*) set -x ;; esac if [ "$1" = "clean" ]; then cleanup exit 0 fi # We need access to CONFIG_ symbols . include/config/auto.conf # Update version info GEN .version if [ -r .version ]; then VERSION=$(expr 0$(cat .version) + 1) echo $VERSION > .version else rm -f .version echo 1 > .version fi; # final build of init/ ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init #link vmlinux.o info LD vmlinux.o modpost_link vmlinux.o # modpost vmlinux.o to check for section mismatches ${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1 info MODINFO modules.builtin.modinfo ${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo btf_vmlinux_bin_o="" if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then if gen_btf .tmp_vmlinux.btf .btf.vmlinux.bin.o ; then btf_vmlinux_bin_o=.btf.vmlinux.bin.o else echo >&2 "Failed to generate BTF for vmlinux" echo >&2 "Try to disable CONFIG_DEBUG_INFO_BTF" exit 1 fi fi kallsymso="" kallsymso_prev="" kallsyms_vmlinux="" if [ -n "${CONFIG_KALLSYMS}" ]; then # kallsyms support # Generate section listing all symbols and add it into vmlinux # It's a three step process: # 1) Link .tmp_vmlinux1 so it has all symbols and sections, # but __kallsyms is empty. # Running kallsyms on that gives us .tmp_kallsyms1.o with # the right size # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of # the right size, but due to the added section, some # addresses have shifted. # From here, we generate a correct .tmp_kallsyms2.o # 3) That link may have expanded the kernel image enough that # more linker branch stubs / trampolines had to be added, which # introduces new names, which further expands kallsyms. Do another # pass if that is the case. In theory it's possible this results # in even more stubs, but unlikely. # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around # other bugs. # 4) The correct ${kallsymso} is linked into the final vmlinux. # # a) Verify that the System.map from vmlinux matches the map from # ${kallsymso}. kallsyms_step 1 kallsyms_step 2 # step 3 size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso_prev}) size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso}) if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then kallsyms_step 3 fi fi vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o} if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then info SORTEX vmlinux sortextable vmlinux fi info SYSMAP System.map mksysmap vmlinux System.map # step a (see comment above) if [ -n "${CONFIG_KALLSYMS}" ]; then mksysmap ${kallsyms_vmlinux} .tmp_System.map if ! cmp -s System.map .tmp_System.map; then echo >&2 Inconsistent kallsyms data echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround exit 1 fi fi