diff options
Diffstat (limited to 'scripts/link-vmlinux.sh')
| -rwxr-xr-x | scripts/link-vmlinux.sh | 261 |
1 files changed, 113 insertions, 148 deletions
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh index dd484e92752e..918470d768e9 100755 --- a/scripts/link-vmlinux.sh +++ b/scripts/link-vmlinux.sh @@ -3,17 +3,15 @@ # # link vmlinux # -# vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_OBJS) and -# $(KBUILD_VMLINUX_LIBS). Most are built-in.a files from top-level directories -# in the kernel tree, others are specified in arch/$(ARCH)/Makefile. +# vmlinux is linked from the objects in vmlinux.a and $(KBUILD_VMLINUX_LIBS). +# vmlinux.a contains objects that are linked unconditionally. # $(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 +# +--< vmlinux.a # | # +--< $(KBUILD_VMLINUX_LIBS) # | +--< lib/lib.a + more @@ -30,29 +28,19 @@ # Error out on error set -e +LD="$1" +KBUILD_LDFLAGS="$2" +LDFLAGS_vmlinux="$3" + +is_enabled() { + grep -q "^$1=y" include/config/auto.conf +} + # Nice output in kbuild format # Will be supressed by "make -s" info() { - if [ "${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} ${objects} + printf " %-7s %s\n" "${1}" "${2}" } # Link of vmlinux @@ -60,43 +48,60 @@ modpost_link() # ${2}, ${3}, ... - optional extra .o files vmlinux_link() { - local lds="${objtree}/${KBUILD_LDS}" local output=${1} - local objects + local objs + local libs + local ld + local ldflags + local ldlibs 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} + if is_enabled CONFIG_LTO_CLANG || is_enabled CONFIG_X86_KERNEL_IBT; then + # Use vmlinux.o instead of performing the slow LTO link again. + objs=vmlinux.o + libs= 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} \ - ${objects} \ - -lutil -lrt -lpthread - rm -f linux + objs=vmlinux.a + libs="${KBUILD_VMLINUX_LIBS}" + fi + + if is_enabled CONFIG_MODULES; then + objs="${objs} .vmlinux.export.o" fi + + objs="${objs} init/version-timestamp.o" + + if [ "${SRCARCH}" = "um" ]; then + wl=-Wl, + ld="${CC}" + ldflags="${CFLAGS_vmlinux}" + ldlibs="-lutil -lrt -lpthread" + else + wl= + ld="${LD}" + ldflags="${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux}" + ldlibs= + fi + + ldflags="${ldflags} ${wl}--script=${objtree}/${KBUILD_LDS}" + + # The kallsyms linking does not need debug symbols included. + if [ "$output" != "${output#.tmp_vmlinux.kallsyms}" ] ; then + ldflags="${ldflags} ${wl}--strip-debug" + fi + + if is_enabled CONFIG_VMLINUX_MAP; then + ldflags="${ldflags} ${wl}-Map=${output}.map" + fi + + ${ld} ${ldflags} -o ${output} \ + ${wl}--whole-archive ${objs} ${wl}--no-whole-archive \ + ${wl}--start-group ${libs} ${wl}--end-group \ + $@ ${ldlibs} } # generate .BTF typeinfo from DWARF debuginfo @@ -105,7 +110,6 @@ vmlinux_link() gen_btf() { local pahole_ver - local bin_arch if ! [ -x "$(command -v ${PAHOLE})" ]; then echo >&2 "BTF: ${1}: pahole (${PAHOLE}) is not available" @@ -113,52 +117,47 @@ gen_btf() 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" + if [ "${pahole_ver}" -lt "116" ]; then + echo >&2 "BTF: ${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.16" 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} + + info "BTF" ${2} + LLVM_OBJCOPY="${OBJCOPY}" ${PAHOLE} -J ${PAHOLE_FLAGS} ${1} + + # Create ${2} which contains just .BTF section but no symbols. Add + # SHF_ALLOC because .BTF will be part of the vmlinux image. --strip-all + # deletes all symbols including __start_BTF and __stop_BTF, which will + # be redefined in the linker script. Add 2>/dev/null to suppress GNU + # objcopy warnings: "empty loadable segment detected at ..." + ${OBJCOPY} --only-section=.BTF --set-section-flags .BTF=alloc,readonly \ + --strip-all ${1} ${2} 2>/dev/null + # Change e_type to ET_REL so that it can be used to link final vmlinux. + # Unlike GNU ld, lld does not allow an ET_EXEC input. + printf '\1' | dd of=${2} conv=notrunc bs=1 seek=16 status=none } -# Create ${2} .o file with all symbols from the ${1} object file +# Create ${2} .S file with all symbols from the ${1} object file kallsyms() { - info KSYM ${2} local kallsymopt; - if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then + if is_enabled CONFIG_KALLSYMS_ALL; then kallsymopt="${kallsymopt} --all-symbols" fi - if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then + if is_enabled CONFIG_KALLSYMS_ABSOLUTE_PERCPU; then kallsymopt="${kallsymopt} --absolute-percpu" fi - if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then + if is_enabled 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} + info KSYMS ${2} + scripts/kallsyms ${kallsymopt} ${1} > ${2} } # Perform one step in kallsyms generation, including temporary linking of @@ -166,17 +165,25 @@ kallsyms() kallsyms_step() { kallsymso_prev=${kallsymso} - kallsymso=.tmp_kallsyms${1}.o - kallsyms_vmlinux=.tmp_vmlinux${1} + kallsyms_vmlinux=.tmp_vmlinux.kallsyms${1} + kallsymso=${kallsyms_vmlinux}.o + kallsyms_S=${kallsyms_vmlinux}.S vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o} - kallsyms ${kallsyms_vmlinux} ${kallsymso} + mksysmap ${kallsyms_vmlinux} ${kallsyms_vmlinux}.syms + kallsyms ${kallsyms_vmlinux}.syms ${kallsyms_S} + + info AS ${kallsyms_S} + ${CC} ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS} \ + ${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ + -c -o ${kallsymso} ${kallsyms_S} } # Create map file with all symbols from ${1} # See mksymap for additional details mksysmap() { + info NM ${2} ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} } @@ -189,30 +196,11 @@ sorttable() 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 + rm -f vmlinux.map } -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*) @@ -225,41 +213,12 @@ if [ "$1" = "clean" ]; then exit 0 fi -# We need access to CONFIG_ symbols -. include/config/auto.conf - -# Update version -info GEN .version -if [ -r .version ]; then - VERSION=$(expr 0$(cat .version) + 1) - echo $VERSION > .version -else - rm -f .version - echo 1 > .version -fi; - -# final build of init/ -${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1 - -#link vmlinux.o -info LD vmlinux.o -modpost_link vmlinux.o - -# modpost vmlinux.o to check for section mismatches -${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1 - -info MODINFO modules.builtin.modinfo -${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo -info GEN modules.builtin -# The second line aids cases where multiple modules share the same object. -tr '\0' '\n' < modules.builtin.modinfo | sed -n 's/^[[:alnum:]:_]*\.file=//p' | - tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$/.ko/' > modules.builtin +${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init init/version-timestamp.o btf_vmlinux_bin_o="" -if [ -n "${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 +if is_enabled CONFIG_DEBUG_INFO_BTF; then + btf_vmlinux_bin_o=.btf.vmlinux.bin.o + if ! gen_btf .tmp_vmlinux.btf $btf_vmlinux_bin_o ; then echo >&2 "Failed to generate BTF for vmlinux" echo >&2 "Try to disable CONFIG_DEBUG_INFO_BTF" exit 1 @@ -269,19 +228,19 @@ fi kallsymso="" kallsymso_prev="" kallsyms_vmlinux="" -if [ -n "${CONFIG_KALLSYMS}" ]; then +if is_enabled 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, + # 1) Link .tmp_vmlinux.kallsyms1 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 + # 2) Link .tmp_vmlinux.kallsyms2 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 + # From here, we generate a correct .tmp_vmlinux.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 @@ -308,7 +267,15 @@ fi vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o} -if [ -n "${CONFIG_BUILDTIME_TABLE_SORT}" ]; then +# fill in BTF IDs +if is_enabled CONFIG_DEBUG_INFO_BTF && is_enabled CONFIG_BPF; then + info BTFIDS vmlinux + ${RESOLVE_BTFIDS} vmlinux +fi + +mksysmap vmlinux System.map + +if is_enabled CONFIG_BUILDTIME_TABLE_SORT; then info SORTTAB vmlinux if ! sorttable vmlinux; then echo >&2 Failed to sort kernel tables @@ -316,16 +283,14 @@ if [ -n "${CONFIG_BUILDTIME_TABLE_SORT}" ]; then fi 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 +if is_enabled CONFIG_KALLSYMS; then + if ! cmp -s System.map ${kallsyms_vmlinux}.syms; then echo >&2 Inconsistent kallsyms data echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround exit 1 fi fi + +# For fixdep +echo "vmlinux: $0" > .vmlinux.d |