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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298#!/bin/sh# SPDX-License-Identifier: GPL-2.0## link vmlinux## 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# ^# |# +--< vmlinux.a# |# +--< $(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 errorset -e
LD="$1"KBUILD_LDFLAGS="$2"LDFLAGS_vmlinux="$3"VMLINUX="$4"
is_enabled() { grep -q "^$1=y" include/config/auto.conf}
# Nice output in kbuild format# Will be supressed by "make -s"info(){ printf " %-7s %s\n" "${1}" "${2}"}
# Link of vmlinux# ${1} - output filevmlinux_link(){ local output=${1} local objs local libs local ld local ldflags local ldlibs
info LD ${output}
# skip output file argument shift
if is_enabled CONFIG_LTO_CLANG || is_enabled CONFIG_X86_KERNEL_IBT || is_enabled CONFIG_KLP_BUILD; then # Use vmlinux.o instead of performing the slow LTO link again. objs=vmlinux.o libs= else objs=vmlinux.a libs="${KBUILD_VMLINUX_LIBS}" fi
if is_enabled CONFIG_GENERIC_BUILTIN_DTB; then objs="${objs} .builtin-dtbs.o" fi
objs="${objs} .vmlinux.export.o" 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}/${KBUILD_LDS}"
# The kallsyms linking does not need debug symbols included. if [ -n "${strip_debug}" ] ; then ldflags="${ldflags} ${wl}--strip-debug" fi
if [ -n "${generate_map}" ]; then ldflags="${ldflags} ${wl}-Map=vmlinux.map" fi
${ld} ${ldflags} -o ${output} \ ${wl}--whole-archive ${objs} ${wl}--no-whole-archive \ ${wl}--start-group ${libs} ${wl}--end-group \ ${kallsymso} ${btf_vmlinux_bin_o} ${arch_vmlinux_o} ${ldlibs}}
# Create ${2}.o file with all symbols from the ${1} object filekallsyms(){ local kallsymopt;
if is_enabled CONFIG_KALLSYMS_ALL; then kallsymopt="${kallsymopt} --all-symbols" fi
if is_enabled CONFIG_64BIT || is_enabled CONFIG_RELOCATABLE; then kallsymopt="${kallsymopt} --pc-relative" fi
info KSYMS "${2}.S" scripts/kallsyms ${kallsymopt} "${1}" > "${2}.S"
info AS "${2}.o" ${CC} ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS} \ ${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} -c -o "${2}.o" "${2}.S"
kallsymso=${2}.o}
# Perform kallsyms for the given temporary vmlinux.sysmap_and_kallsyms(){ mksysmap "${1}" "${1}.syms" kallsyms "${1}.syms" "${1}.kallsyms"
kallsyms_sysmap=${1}.syms}
# Create map file with all symbols from ${1}# See mksymap for additional detailsmksysmap(){ info NM ${2} ${NM} -n "${1}" | sed -f "${srctree}/scripts/mksysmap" > "${2}"}
sorttable(){ ${NM} -S ${1} > .tmp_vmlinux.nm-sort ${objtree}/scripts/sorttable -s .tmp_vmlinux.nm-sort ${1}}
cleanup(){ rm -f .btf.* rm -f .tmp_vmlinux.nm-sort rm -f System.map rm -f vmlinux rm -f vmlinux.map}
# Use "make V=1" to debug this scriptcase "${KBUILD_VERBOSE}" in*1*) set -x ;;esac
if [ "$1" = "clean" ]; then cleanup exit 0fi
${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init init/version-timestamp.o
arch_vmlinux_o=if is_enabled CONFIG_ARCH_WANTS_PRE_LINK_VMLINUX; then arch_vmlinux_o=arch/${SRCARCH}/tools/vmlinux.arch.ofi
btf_vmlinux_bin_o=btfids_vmlinux=kallsymso=strip_debug=generate_map=
# Use "make UT=1" to trigger warnings on unused tracepointscase "${WARN_ON_UNUSED_TRACEPOINTS}" in*1*) ${objtree}/scripts/tracepoint-update vmlinux.o ;;esac
if is_enabled CONFIG_KALLSYMS; then true > .tmp_vmlinux0.syms kallsyms .tmp_vmlinux0.syms .tmp_vmlinux0.kallsymsfi
if is_enabled CONFIG_KALLSYMS || is_enabled CONFIG_DEBUG_INFO_BTF; then
# The kallsyms linking does not need debug symbols, but the BTF does. if ! is_enabled CONFIG_DEBUG_INFO_BTF; then strip_debug=1 fi
vmlinux_link .tmp_vmlinux1fi
if is_enabled CONFIG_DEBUG_INFO_BTF; then info BTF .tmp_vmlinux1 if ! ${CONFIG_SHELL} ${srctree}/scripts/gen-btf.sh .tmp_vmlinux1; then echo >&2 "Failed to generate BTF for vmlinux" echo >&2 "Try to disable CONFIG_DEBUG_INFO_BTF" exit 1 fi btf_vmlinux_bin_o=.tmp_vmlinux1.btf.o btfids_vmlinux=.tmp_vmlinux1.BTF_idsfi
if is_enabled CONFIG_KALLSYMS; then
# kallsyms support # Generate section listing all symbols and add it into vmlinux # It's a four step process: # 0) Generate a dummy __kallsyms with empty symbol list. # 1) Link .tmp_vmlinux1.kallsyms so it has all symbols and sections, # with a dummy __kallsyms. # Running kallsyms on that gives us .tmp_vmlinux1.kallsyms.o with # the right size # 2) Link .tmp_vmlinux2.kallsyms 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_vmlinux2.kallsyms.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 # ${kallsymso}.
# The kallsyms linking does not need debug symbols included. strip_debug=1
sysmap_and_kallsyms .tmp_vmlinux1 size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso})
vmlinux_link .tmp_vmlinux2 sysmap_and_kallsyms .tmp_vmlinux2 size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso})
if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then vmlinux_link .tmp_vmlinux3 sysmap_and_kallsyms .tmp_vmlinux3 fifi
strip_debug=
if is_enabled CONFIG_VMLINUX_MAP; then generate_map=1fi
vmlinux_link "${VMLINUX}"
if is_enabled CONFIG_DEBUG_INFO_BTF; then info BTFIDS ${VMLINUX} ${RESOLVE_BTFIDS} --patch_btfids ${btfids_vmlinux} ${VMLINUX}fi
mksysmap "${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 exit 1 fifi
# step a (see comment above)if is_enabled CONFIG_KALLSYMS; then if ! cmp -s System.map "${kallsyms_sysmap}"; then echo >&2 Inconsistent kallsyms data echo >&2 'Try "make KALLSYMS_EXTRA_PASS=1" as a workaround' exit 1 fifi
# For fixdepecho "${VMLINUX}: $0" > ".${VMLINUX}.d"