Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 375 insertions, 0 deletions

diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
new file mode 100755
index 000000000..acd07a70a
--- /dev/null
+++ b/scripts/link-vmlinux.sh
@@ -0,0 +1,375 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# 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.
+# $(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
+#   |
+#   +--< $(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 error
+set -e
+
+LD="$1"
+KBUILD_LDFLAGS="$2"
+LDFLAGS_vmlinux="$3"
+
+# Nice output in kbuild format
+# Will be supressed by "make -s"
+info()
+{
+	if [ "${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} ${objects}
+}
+
+objtool_link()
+{
+	local objtoolopt;
+
+	if [ -n "${CONFIG_VMLINUX_VALIDATION}" ]; then
+		objtoolopt="check"
+		if [ -n "${CONFIG_CPU_UNRET_ENTRY}" ]; then
+			objtoolopt="${objtoolopt} --unret"
+		fi
+		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
+		if [ -n "${CONFIG_SLS}" ]; then
+			objtoolopt="${objtoolopt} --sls"
+		fi
+		info OBJTOOL ${1}
+		tools/objtool/objtool ${objtoolopt} ${1}
+	fi
+}
+
+# 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
+
+	info LD ${output}
+
+	# skip output file argument
+	shift
+
+	# The kallsyms linking does not need debug symbols included.
+	if [ "$output" != "${output#.tmp_vmlinux.kallsyms}" ] ; then
+		strip_debug=-Wl,--strip-debug
+	fi
+
+	if [ "${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}
+	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
+	fi
+}
+
+# generate .BTF typeinfo from DWARF debuginfo
+# ${1} - vmlinux image
+# ${2} - file to dump raw BTF data into
+gen_btf()
+{
+	local pahole_ver
+
+	if ! [ -x "$(command -v ${PAHOLE})" ]; then
+		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 "116" ]; then
+		echo >&2 "BTF: ${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.16"
+		return 1
+	fi
+
+	vmlinux_link ${1}
+
+	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} .S file with all symbols from the ${1} object file
+kallsyms()
+{
+	local kallsymopt;
+
+	if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
+		kallsymopt="${kallsymopt} --all-symbols"
+	fi
+
+	if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then
+		kallsymopt="${kallsymopt} --absolute-percpu"
+	fi
+
+	if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then
+		kallsymopt="${kallsymopt} --base-relative"
+	fi
+
+	info KSYMS ${2}
+	${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${2}
+}
+
+# Perform one step in kallsyms generation, including temporary linking of
+# vmlinux.
+kallsyms_step()
+{
+	kallsymso_prev=${kallsymso}
+	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} ${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()
+{
+	${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
+}
+
+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
+}
+
+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*)
+	set -x
+	;;
+esac
+
+if [ "$1" = "clean" ]; then
+	cleanup
+	exit 0
+fi
+
+# We need access to CONFIG_ symbols
+. include/config/auto.conf
+
+# Update version
+info GEN .version
+if [ -r .version ]; then
+	VERSION=$(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 $btf_vmlinux_bin_o ; then
+		echo >&2 "Failed to generate BTF for vmlinux"
+		echo >&2 "Try to disable CONFIG_DEBUG_INFO_BTF"
+		exit 1
+	fi
+fi
+
+kallsymso=""
+kallsymso_prev=""
+kallsyms_vmlinux=""
+if [ -n "${CONFIG_KALLSYMS}" ]; then
+
+	# 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
+	#     the right size
+	# 2)  Link .tmp_vmlinux2 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
+	# 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
+	#     ${kallsymso}.
+
+	kallsyms_step 1
+	kallsyms_step 2
+
+	# step 3
+	size1=$(${CONFIG_SHELL} "${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
+		kallsyms_step 3
+	fi
+fi
+
+vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o}
+
+# fill in BTF IDs
+if [ -n "${CONFIG_DEBUG_INFO_BTF}" -a -n "${CONFIG_BPF}" ]; then
+	info BTFIDS vmlinux
+	${RESOLVE_BTFIDS} vmlinux
+fi
+
+if [ -n "${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
+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
+		echo >&2 Inconsistent kallsyms data
+		echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
+		exit 1
+	fi
+fi