diff options
Diffstat (limited to 'scripts/link-vmlinux.sh')
| -rwxr-xr-x | scripts/link-vmlinux.sh | 121 |
1 files changed, 79 insertions, 42 deletions
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh index 915775eb2921..dd484e92752e 100755 --- a/scripts/link-vmlinux.sh +++ b/scripts/link-vmlinux.sh @@ -56,13 +56,19 @@ modpost_link() } # Link of vmlinux -# ${1} - optional extra .o files -# ${2} - output file +# ${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} \ @@ -70,9 +76,10 @@ vmlinux_link() --start-group \ ${KBUILD_VMLINUX_LIBS} \ --end-group \ - ${1}" + ${@}" - ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} \ + ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} \ + -o ${output} \ -T ${lds} ${objects} else objects="-Wl,--whole-archive \ @@ -81,9 +88,10 @@ vmlinux_link() -Wl,--start-group \ ${KBUILD_VMLINUX_LIBS} \ -Wl,--end-group \ - ${1}" + ${@}" - ${CC} ${CFLAGS_vmlinux} -o ${2} \ + ${CC} ${CFLAGS_vmlinux} \ + -o ${output} \ -Wl,-T,${lds} \ ${objects} \ -lutil -lrt -lpthread @@ -92,23 +100,38 @@ vmlinux_link() } # generate .BTF typeinfo from DWARF debuginfo +# ${1} - vmlinux image +# ${2} - file to dump raw BTF data into gen_btf() { - local pahole_ver; + local pahole_ver + local bin_arch if ! [ -x "$(command -v ${PAHOLE})" ]; then - info "BTF" "${1}: pahole (${PAHOLE}) is not available" - return 0 + 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 [ "${pahole_ver}" -lt "113" ]; then - info "BTF" "${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.13" - return 0 + echo >&2 "BTF: ${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.13" + return 1 fi - info "BTF" ${1} + 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 @@ -138,6 +161,18 @@ kallsyms() ${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() @@ -145,14 +180,15 @@ mksysmap() ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} } -sortextable() +sorttable() { - ${objtree}/scripts/sortextable ${1} + ${objtree}/scripts/sorttable ${1} } # Delete output files in case of error cleanup() { + rm -f .btf.* rm -f .tmp_System.map rm -f .tmp_kallsyms* rm -f .tmp_vmlinux* @@ -203,7 +239,7 @@ else fi; # final build of init/ -${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init +${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1 #link vmlinux.o info LD vmlinux.o @@ -214,8 +250,24 @@ ${MAKE} -f "${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 + +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 @@ -242,41 +294,26 @@ if [ -n "${CONFIG_KALLSYMS}" ]; then # a) Verify that the System.map from vmlinux matches the map from # ${kallsymso}. - kallsymso=.tmp_kallsyms2.o - kallsyms_vmlinux=.tmp_vmlinux2 - - # step 1 - vmlinux_link "" .tmp_vmlinux1 - kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o - - # step 2 - vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2 - kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o + kallsyms_step 1 + kallsyms_step 2 # step 3 - size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms1.o) - size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms2.o) + size1=$(${CONFIG_SHELL} "${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 - kallsymso=.tmp_kallsyms3.o - kallsyms_vmlinux=.tmp_vmlinux3 - - vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3 - - kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o + kallsyms_step 3 fi fi -info LD vmlinux -vmlinux_link "${kallsymso}" vmlinux +vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o} -if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then - gen_btf vmlinux -fi - -if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then - info SORTEX vmlinux - sortextable vmlinux +if [ -n "${CONFIG_BUILDTIME_TABLE_SORT}" ]; then + info SORTTAB vmlinux + if ! sorttable vmlinux; then + echo >&2 Failed to sort kernel tables + exit 1 + fi fi info SYSMAP System.map |
