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-rwxr-xr-xscripts/link-vmlinux.sh360
1 files changed, 157 insertions, 203 deletions
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 92dd745906f4..56a077d204cf 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
# |
# +--< $(KBUILD_VMLINUX_LIBS)
# | +--< lib/lib.a + more
@@ -30,185 +28,151 @@
# Error out on error
set -e
-# Nice output in kbuild format
-# Will be supressed by "make -s"
-info()
-{
- if [ "${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="$1"
+KBUILD_LDFLAGS="$2"
+LDFLAGS_vmlinux="$3"
- ${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${objects}
+is_enabled() {
+ grep -q "^$1=y" include/config/auto.conf
}
-objtool_link()
+# Nice output in kbuild format
+# Will be supressed by "make -s"
+info()
{
- local objtoolopt;
-
- if [ -n "${CONFIG_VMLINUX_VALIDATION}" ]; then
- objtoolopt="check"
- if [ -z "${CONFIG_FRAME_POINTER}" ]; then
- objtoolopt="${objtoolopt} --no-fp"
- fi
- if [ -n "${CONFIG_GCOV_KERNEL}" ]; then
- objtoolopt="${objtoolopt} --no-unreachable"
- fi
- if [ -n "${CONFIG_RETPOLINE}" ]; then
- objtoolopt="${objtoolopt} --retpoline"
- fi
- if [ -n "${CONFIG_X86_SMAP}" ]; then
- objtoolopt="${objtoolopt} --uaccess"
- fi
- info OBJTOOL ${1}
- tools/objtool/objtool ${objtoolopt} ${1}
- fi
+ printf " %-7s %s\n" "${1}" "${2}"
}
# Link of vmlinux
# ${1} - output file
-# ${2}, ${3}, ... - optional extra .o files
vmlinux_link()
{
- local lds="${objtree}/${KBUILD_LDS}"
local output=${1}
- local objects
- local strip_debug
+ local objs
+ local libs
+ local ld
+ local ldflags
+ local ldlibs
info LD ${output}
# skip output file argument
shift
- # The kallsyms linking does not need debug symbols included.
- if [ "$output" != "${output#.tmp_vmlinux.kallsyms}" ] ; then
- strip_debug=-Wl,--strip-debug
+ if is_enabled CONFIG_LTO_CLANG || is_enabled CONFIG_X86_KERNEL_IBT; then
+ # Use vmlinux.o instead of performing the slow LTO link again.
+ objs=vmlinux.o
+ libs=
+ else
+ objs=vmlinux.a
+ libs="${KBUILD_VMLINUX_LIBS}"
+ fi
+
+ if is_enabled CONFIG_GENERIC_BUILTIN_DTB; then
+ objs="${objs} .builtin-dtbs.o"
fi
- if [ "${SRCARCH}" != "um" ]; then
- objects="--whole-archive \
- ${KBUILD_VMLINUX_OBJS} \
- --no-whole-archive \
- --start-group \
- ${KBUILD_VMLINUX_LIBS} \
- --end-group \
- ${@}"
-
- ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} \
- ${strip_debug#-Wl,} \
- -o ${output} \
- -T ${lds} ${objects}
+ if is_enabled CONFIG_MODULES; then
+ objs="${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
- objects="-Wl,--whole-archive \
- ${KBUILD_VMLINUX_OBJS} \
- -Wl,--no-whole-archive \
- -Wl,--start-group \
- ${KBUILD_VMLINUX_LIBS} \
- -Wl,--end-group \
- ${@}"
-
- ${CC} ${CFLAGS_vmlinux} \
- ${strip_debug} \
- -o ${output} \
- -Wl,-T,${lds} \
- ${objects} \
- -lutil -lrt -lpthread
- rm -f linux
+ wl=
+ ld="${LD}"
+ ldflags="${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux}"
+ ldlibs=
fi
-}
-# generate .BTF typeinfo from DWARF debuginfo
-# ${1} - vmlinux image
-# ${2} - file to dump raw BTF data into
-gen_btf()
-{
- local pahole_ver
+ ldflags="${ldflags} ${wl}--script=${objtree}/${KBUILD_LDS}"
- if ! [ -x "$(command -v ${PAHOLE})" ]; then
- echo >&2 "BTF: ${1}: pahole (${PAHOLE}) is not available"
- return 1
+ # The kallsyms linking does not need debug symbols included.
+ if [ -n "${strip_debug}" ] ; then
+ ldflags="${ldflags} ${wl}--strip-debug"
fi
- pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/')
- if [ "${pahole_ver}" -lt "116" ]; then
- echo >&2 "BTF: ${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.16"
- return 1
+ if is_enabled CONFIG_VMLINUX_MAP; then
+ ldflags="${ldflags} ${wl}-Map=${output}.map"
fi
- vmlinux_link ${1}
+ ${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}
+}
+
+# generate .BTF typeinfo from DWARF debuginfo
+# ${1} - vmlinux image
+gen_btf()
+{
+ local btf_data=${1}.btf.o
- info "BTF" ${2}
- LLVM_OBJCOPY=${OBJCOPY} ${PAHOLE} -J ${1}
+ info BTF "${btf_data}"
+ LLVM_OBJCOPY="${OBJCOPY}" ${PAHOLE} -J ${PAHOLE_FLAGS} ${1}
- # Create ${2} which contains just .BTF section but no symbols. Add
+ # Create ${btf_data} 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
+ --strip-all ${1} "${btf_data}" 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=${2} conv=notrunc bs=1 seek=16 status=none
+ # GNU ld 2.35+ and lld do not allow an ET_EXEC input.
+ if is_enabled CONFIG_CPU_BIG_ENDIAN; then
+ et_rel='\0\1'
+ else
+ et_rel='\1\0'
+ fi
+ printf "${et_rel}" | dd of="${btf_data}" conv=notrunc bs=1 seek=16 status=none
+
+ btf_vmlinux_bin_o=${btf_data}
}
-# Create ${2} .o file with all symbols from the ${1} object file
+# Create ${2}.o 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
- kallsymopt="${kallsymopt} --base-relative"
- fi
-
- local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
- ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
+ info KSYMS "${2}.S"
+ scripts/kallsyms ${kallsymopt} "${1}" > "${2}.S"
- local afile="`basename ${2} .o`.S"
+ info AS "${2}.o"
+ ${CC} ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS} \
+ ${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} -c -o "${2}.o" "${2}.S"
- ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile}
- ${CC} ${aflags} -c -o ${2} ${afile}
+ kallsymso=${2}.o
}
-# Perform one step in kallsyms generation, including temporary linking of
-# vmlinux.
-kallsyms_step()
+# Perform kallsyms for the given temporary vmlinux.
+sysmap_and_kallsyms()
{
- kallsymso_prev=${kallsymso}
- kallsyms_vmlinux=.tmp_vmlinux.kallsyms${1}
- kallsymso=${kallsyms_vmlinux}.o
+ mksysmap "${1}" "${1}.syms"
+ kallsyms "${1}.syms" "${1}.kallsyms"
- vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o}
- kallsyms ${kallsyms_vmlinux} ${kallsymso}
+ kallsyms_sysmap=${1}.syms
}
# Create map file with all symbols from ${1}
# See mksymap for additional details
mksysmap()
{
- ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
+ info NM ${2}
+ ${NM} -n "${1}" | sed -f "${srctree}/scripts/mksysmap" > "${2}"
}
sorttable()
@@ -216,31 +180,14 @@ sorttable()
${objtree}/scripts/sorttable ${1}
}
-# Delete output files in case of error
cleanup()
{
rm -f .btf.*
- rm -f .tmp_System.map
- 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*)
@@ -253,63 +200,54 @@ 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 "${srctree}/scripts/Makefile.build" obj=init need-builtin=1
-
-#link vmlinux.o
-info LD vmlinux.o
-modpost_link vmlinux.o
-objtool_link vmlinux.o
-
-# modpost vmlinux.o to check for section mismatches
-${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/$/.ko/' > modules.builtin
-
-btf_vmlinux_bin_o=""
-if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then
- btf_vmlinux_bin_o=.btf.vmlinux.bin.o
- if ! gen_btf .tmp_vmlinux.btf $btf_vmlinux_bin_o ; then
+${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.o
+fi
+
+btf_vmlinux_bin_o=
+kallsymso=
+strip_debug=
+
+if is_enabled CONFIG_KALLSYMS; then
+ true > .tmp_vmlinux0.syms
+ kallsyms .tmp_vmlinux0.syms .tmp_vmlinux0.kallsyms
+fi
+
+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_vmlinux1
+fi
+
+if is_enabled CONFIG_DEBUG_INFO_BTF; then
+ if ! gen_btf .tmp_vmlinux1; then
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 "${CONFIG_KALLSYMS}" ]; then
+if is_enabled CONFIG_KALLSYMS; then
# kallsyms support
# Generate section listing all symbols and add it into vmlinux
- # It's a three step process:
- # 1) Link .tmp_vmlinux1 so it has all symbols and sections,
- # but __kallsyms is empty.
- # Running kallsyms on that gives us .tmp_kallsyms1.o with
+ # It's a four step process:
+ # 0) Generate a dummy __kallsyms with empty symbol list.
+ # 1) Link .tmp_vmlinux1.kallsyms so it has all symbols and sections,
+ # with a dummy __kallsyms.
+ # Running kallsyms on that gives us .tmp_vmlinux1.kallsyms.o with
# the right size
- # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of
+ # 2) Link .tmp_vmlinux2.kallsyms so it now has a __kallsyms section of
# the right size, but due to the added section, some
# addresses have shifted.
- # From here, we generate a correct .tmp_kallsyms2.o
+ # From here, we generate a correct .tmp_vmlinux2.kallsyms.o
# 3) That link may have expanded the kernel image enough that
# more linker branch stubs / trampolines had to be added, which
# introduces new names, which further expands kallsyms. Do another
@@ -322,21 +260,39 @@ if [ -n "${CONFIG_KALLSYMS}" ]; then
# a) Verify that the System.map from vmlinux matches the map from
# ${kallsymso}.
- kallsyms_step 1
- kallsyms_step 2
+ # The kallsyms linking does not need debug symbols included.
+ strip_debug=1
+
+ sysmap_and_kallsyms .tmp_vmlinux1
+ size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso})
- # step 3
- size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso_prev})
+ vmlinux_link .tmp_vmlinux2
+ sysmap_and_kallsyms .tmp_vmlinux2
size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso})
if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
- kallsyms_step 3
+ vmlinux_link .tmp_vmlinux3
+ sysmap_and_kallsyms .tmp_vmlinux3
+ fi
+fi
+
+strip_debug=
+
+vmlinux_link vmlinux
+
+# fill in BTF IDs
+if is_enabled CONFIG_DEBUG_INFO_BTF; then
+ info BTFIDS vmlinux
+ RESOLVE_BTFIDS_ARGS=""
+ if is_enabled CONFIG_WERROR; then
+ RESOLVE_BTFIDS_ARGS=" --fatal_warnings "
fi
+ ${RESOLVE_BTFIDS} ${RESOLVE_BTFIDS_ARGS} vmlinux
fi
-vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o}
+mksysmap vmlinux System.map
-if [ -n "${CONFIG_BUILDTIME_TABLE_SORT}" ]; then
+if is_enabled CONFIG_BUILDTIME_TABLE_SORT; then
info SORTTAB vmlinux
if ! sorttable vmlinux; then
echo >&2 Failed to sort kernel tables
@@ -344,16 +300,14 @@ 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_sysmap}"; then
echo >&2 Inconsistent kallsyms data
- echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
+ echo >&2 'Try "make KALLSYMS_EXTRA_PASS=1" as a workaround'
exit 1
fi
fi
+
+# For fixdep
+echo "vmlinux: $0" > .vmlinux.d