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- #!/bin/sh
- # SPDX-License-Identifier: GPL-2.0-only
- # Create an autoksyms.h header file from the list of all module's needed symbols
- # as recorded on the second line of *.mod files and the user-provided symbol
- # whitelist.
- set -e
- output_file="$1"
- # Use "make V=1" to debug this script.
- case "$KBUILD_VERBOSE" in
- *1*)
- set -x
- ;;
- esac
- # We need access to CONFIG_ symbols
- . include/config/auto.conf
- needed_symbols=
- # Special case for modversions (see modpost.c)
- if [ -n "$CONFIG_MODVERSIONS" ]; then
- needed_symbols="$needed_symbols module_layout"
- fi
- # With CONFIG_LTO_CLANG, LLVM bitcode has not yet been compiled into a binary
- # when the .mod files are generated, which means they don't yet contain
- # references to certain symbols that will be present in the final binaries.
- if [ -n "$CONFIG_LTO_CLANG" ]; then
- # intrinsic functions
- needed_symbols="$needed_symbols memcpy memmove memset"
- # ftrace
- needed_symbols="$needed_symbols _mcount"
- # stack protector symbols
- needed_symbols="$needed_symbols __stack_chk_fail __stack_chk_guard"
- fi
- ksym_wl=
- if [ -n "$CONFIG_UNUSED_KSYMS_WHITELIST" ]; then
- # Use 'eval' to expand the whitelist path and check if it is relative
- eval ksym_wl="$CONFIG_UNUSED_KSYMS_WHITELIST"
- [ "${ksym_wl}" != "${ksym_wl#/}" ] || ksym_wl="$abs_srctree/$ksym_wl"
- if [ ! -f "$ksym_wl" ] || [ ! -r "$ksym_wl" ]; then
- echo "ERROR: '$ksym_wl' whitelist file not found" >&2
- exit 1
- fi
- fi
- # Generate a new ksym list file with symbols needed by the current
- # set of modules.
- cat > "$output_file" << EOT
- /*
- * Automatically generated file; DO NOT EDIT.
- */
- EOT
- [ -f modules.order ] && modlist=modules.order || modlist=/dev/null
- {
- sed 's/ko$/mod/' $modlist | xargs -n1 sed -n -e '2p'
- echo "$needed_symbols"
- [ -n "$ksym_wl" ] && cat "$ksym_wl"
- } | sed -e 's/ /\n/g' | sed -n -e '/^$/!p' |
- # Remove the dot prefix for ppc64; symbol names with a dot (.) hold entry
- # point addresses.
- sed -e 's/^\.//' |
- sort -u |
- sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$output_file"
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