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296 lines
7.4 KiB
296 lines
7.4 KiB
#!/bin/sh |
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# SPDX-License-Identifier: GPL-2.0 |
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# |
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# link vmlinux |
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# |
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# vmlinux is linked from the objects in vmlinux.a and $(KBUILD_VMLINUX_LIBS). |
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# vmlinux.a contains objects that are linked unconditionally. |
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# $(KBUILD_VMLINUX_LIBS) are archives which are linked conditionally |
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# (not within --whole-archive), and do not require symbol indexes added. |
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# |
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# vmlinux |
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# ^ |
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# | |
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# +--< vmlinux.a |
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# | |
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# +--< $(KBUILD_VMLINUX_LIBS) |
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# | +--< lib/lib.a + more |
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# | |
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# +-< ${kallsymso} (see description in KALLSYMS section) |
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# |
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# vmlinux version (uname -v) cannot be updated during normal |
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# descending-into-subdirs phase since we do not yet know if we need to |
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# update vmlinux. |
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# Therefore this step is delayed until just before final link of vmlinux. |
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# |
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# System.map is generated to document addresses of all kernel symbols |
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# Error out on error |
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set -e |
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LD="$1" |
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KBUILD_LDFLAGS="$2" |
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LDFLAGS_vmlinux="$3" |
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is_enabled() { |
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grep -q "^$1=y" include/config/auto.conf |
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} |
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# Nice output in kbuild format |
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# Will be supressed by "make -s" |
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info() |
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{ |
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printf " %-7s %s\n" "${1}" "${2}" |
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} |
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# Link of vmlinux |
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# ${1} - output file |
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# ${2}, ${3}, ... - optional extra .o files |
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vmlinux_link() |
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{ |
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local output=${1} |
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local objs |
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local libs |
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local ld |
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local ldflags |
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local ldlibs |
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info LD ${output} |
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# skip output file argument |
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shift |
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if is_enabled CONFIG_LTO_CLANG || is_enabled CONFIG_X86_KERNEL_IBT; then |
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# Use vmlinux.o instead of performing the slow LTO link again. |
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objs=vmlinux.o |
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libs= |
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else |
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objs=vmlinux.a |
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libs="${KBUILD_VMLINUX_LIBS}" |
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fi |
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if is_enabled CONFIG_MODULES; then |
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objs="${objs} .vmlinux.export.o" |
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fi |
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objs="${objs} init/version-timestamp.o" |
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if [ "${SRCARCH}" = "um" ]; then |
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wl=-Wl, |
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ld="${CC}" |
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ldflags="${CFLAGS_vmlinux}" |
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ldlibs="-lutil -lrt -lpthread" |
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else |
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wl= |
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ld="${LD}" |
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ldflags="${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux}" |
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ldlibs= |
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fi |
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ldflags="${ldflags} ${wl}--script=${objtree}/${KBUILD_LDS}" |
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# The kallsyms linking does not need debug symbols included. |
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if [ "$output" != "${output#.tmp_vmlinux.kallsyms}" ] ; then |
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ldflags="${ldflags} ${wl}--strip-debug" |
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fi |
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if is_enabled CONFIG_VMLINUX_MAP; then |
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ldflags="${ldflags} ${wl}-Map=${output}.map" |
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fi |
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${ld} ${ldflags} -o ${output} \ |
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${wl}--whole-archive ${objs} ${wl}--no-whole-archive \ |
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${wl}--start-group ${libs} ${wl}--end-group \ |
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$@ ${ldlibs} |
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} |
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# generate .BTF typeinfo from DWARF debuginfo |
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# ${1} - vmlinux image |
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# ${2} - file to dump raw BTF data into |
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gen_btf() |
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{ |
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local pahole_ver |
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if ! [ -x "$(command -v ${PAHOLE})" ]; then |
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echo >&2 "BTF: ${1}: pahole (${PAHOLE}) is not available" |
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return 1 |
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fi |
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pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/') |
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if [ "${pahole_ver}" -lt "116" ]; then |
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echo >&2 "BTF: ${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.16" |
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return 1 |
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fi |
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vmlinux_link ${1} |
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info "BTF" ${2} |
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LLVM_OBJCOPY="${OBJCOPY}" ${PAHOLE} -J ${PAHOLE_FLAGS} ${1} |
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# Create ${2} which contains just .BTF section but no symbols. Add |
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# SHF_ALLOC because .BTF will be part of the vmlinux image. --strip-all |
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# deletes all symbols including __start_BTF and __stop_BTF, which will |
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# be redefined in the linker script. Add 2>/dev/null to suppress GNU |
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# objcopy warnings: "empty loadable segment detected at ..." |
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${OBJCOPY} --only-section=.BTF --set-section-flags .BTF=alloc,readonly \ |
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--strip-all ${1} ${2} 2>/dev/null |
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# Change e_type to ET_REL so that it can be used to link final vmlinux. |
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# Unlike GNU ld, lld does not allow an ET_EXEC input. |
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printf '\1' | dd of=${2} conv=notrunc bs=1 seek=16 status=none |
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} |
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# Create ${2} .S file with all symbols from the ${1} object file |
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kallsyms() |
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{ |
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local kallsymopt; |
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if is_enabled CONFIG_KALLSYMS_ALL; then |
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kallsymopt="${kallsymopt} --all-symbols" |
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fi |
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if is_enabled CONFIG_KALLSYMS_ABSOLUTE_PERCPU; then |
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kallsymopt="${kallsymopt} --absolute-percpu" |
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fi |
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if is_enabled CONFIG_KALLSYMS_BASE_RELATIVE; then |
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kallsymopt="${kallsymopt} --base-relative" |
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fi |
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info KSYMS ${2} |
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scripts/kallsyms ${kallsymopt} ${1} > ${2} |
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} |
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# Perform one step in kallsyms generation, including temporary linking of |
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# vmlinux. |
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kallsyms_step() |
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{ |
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kallsymso_prev=${kallsymso} |
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kallsyms_vmlinux=.tmp_vmlinux.kallsyms${1} |
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kallsymso=${kallsyms_vmlinux}.o |
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kallsyms_S=${kallsyms_vmlinux}.S |
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vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o} |
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mksysmap ${kallsyms_vmlinux} ${kallsyms_vmlinux}.syms |
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kallsyms ${kallsyms_vmlinux}.syms ${kallsyms_S} |
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info AS ${kallsyms_S} |
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${CC} ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS} \ |
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${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ |
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-c -o ${kallsymso} ${kallsyms_S} |
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} |
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# Create map file with all symbols from ${1} |
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# See mksymap for additional details |
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mksysmap() |
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{ |
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info NM ${2} |
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${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} |
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} |
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sorttable() |
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{ |
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${objtree}/scripts/sorttable ${1} |
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} |
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# Delete output files in case of error |
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cleanup() |
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{ |
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rm -f .btf.* |
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rm -f System.map |
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rm -f vmlinux |
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rm -f vmlinux.map |
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} |
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# Use "make V=1" to debug this script |
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case "${KBUILD_VERBOSE}" in |
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*1*) |
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set -x |
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;; |
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esac |
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if [ "$1" = "clean" ]; then |
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cleanup |
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exit 0 |
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fi |
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${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init init/version-timestamp.o |
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btf_vmlinux_bin_o="" |
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if is_enabled CONFIG_DEBUG_INFO_BTF; then |
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btf_vmlinux_bin_o=.btf.vmlinux.bin.o |
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if ! gen_btf .tmp_vmlinux.btf $btf_vmlinux_bin_o ; then |
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echo >&2 "Failed to generate BTF for vmlinux" |
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echo >&2 "Try to disable CONFIG_DEBUG_INFO_BTF" |
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exit 1 |
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fi |
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fi |
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kallsymso="" |
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kallsymso_prev="" |
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kallsyms_vmlinux="" |
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if is_enabled CONFIG_KALLSYMS; then |
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# kallsyms support |
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# Generate section listing all symbols and add it into vmlinux |
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# It's a three step process: |
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# 1) Link .tmp_vmlinux.kallsyms1 so it has all symbols and sections, |
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# but __kallsyms is empty. |
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# Running kallsyms on that gives us .tmp_kallsyms1.o with |
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# the right size |
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# 2) Link .tmp_vmlinux.kallsyms2 so it now has a __kallsyms section of |
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# the right size, but due to the added section, some |
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# addresses have shifted. |
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# From here, we generate a correct .tmp_vmlinux.kallsyms2.o |
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# 3) That link may have expanded the kernel image enough that |
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# more linker branch stubs / trampolines had to be added, which |
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# introduces new names, which further expands kallsyms. Do another |
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# pass if that is the case. In theory it's possible this results |
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# in even more stubs, but unlikely. |
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# KALLSYMS_EXTRA_PASS=1 may also used to debug or work around |
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# other bugs. |
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# 4) The correct ${kallsymso} is linked into the final vmlinux. |
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# |
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# a) Verify that the System.map from vmlinux matches the map from |
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# ${kallsymso}. |
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kallsyms_step 1 |
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kallsyms_step 2 |
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# step 3 |
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size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso_prev}) |
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size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso}) |
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if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then |
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kallsyms_step 3 |
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fi |
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fi |
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vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o} |
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# fill in BTF IDs |
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if is_enabled CONFIG_DEBUG_INFO_BTF && is_enabled CONFIG_BPF; then |
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info BTFIDS vmlinux |
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${RESOLVE_BTFIDS} vmlinux |
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fi |
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mksysmap vmlinux System.map |
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if is_enabled CONFIG_BUILDTIME_TABLE_SORT; then |
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info SORTTAB vmlinux |
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if ! sorttable vmlinux; then |
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echo >&2 Failed to sort kernel tables |
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exit 1 |
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fi |
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fi |
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# step a (see comment above) |
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if is_enabled CONFIG_KALLSYMS; then |
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if ! cmp -s System.map ${kallsyms_vmlinux}.syms; then |
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echo >&2 Inconsistent kallsyms data |
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echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround |
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exit 1 |
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fi |
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fi |
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# For fixdep |
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echo "vmlinux: $0" > .vmlinux.d
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