7beed73af0
Create input symbol files to generate GKI modules header
under include/config. By placing files in this generated
directory, the default filters that ignore certain files
will work without any special handling required, and they
will also be available to inspect after the build to inspect
for the debugging purposes.
abi_gki_protected_exports: Input for gki_module_protected_exports.h
From :- ${objtree}/abi_gki_protected_exports
To :- include/config/abi_gki_protected_exports
all_kmi_symbols: Input for gki_module_unprotected.h
- Rename to abi_gki_kmi_symbols
From :- all_kmi_symbols
To :- include/config/abi_gki_kmi_symbols
Bug: 286529877
Test: TH
Test: Manual verification of the generated files
Change-Id: Iafa10631e7712a8e1e87a2f56cfd614de6b1053a
Signed-off-by: Ramji Jiyani <ramjiyani@google.com>
123 lines
3 KiB
Bash
Executable file
123 lines
3 KiB
Bash
Executable file
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0-only
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#
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# Copyright 2022 Google LLC
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# Author: ramjiyani@google.com (Ramji Jiyani)
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#
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#
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# Generates header file with list of unprotected symbols
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#
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# Called By: KERNEL_SRC/kernel/Makefile if CONFIG_MODULE_SIG_PROTECT=y
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#
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# gki_module_unprotected.h: Symbols allowed to _access_ by unsigned modules
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#
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# If valid symbol file doesn't exists then still generates valid C header files for
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# compilation to proceed with no symbols to protect
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#
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# Collect arguments from Makefile
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TARGET=$1
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SRCTREE=$2
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SYMBOL_LIST=$3
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set -e
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#
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# Common Definitions
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#
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# Use "make V=1" to debug this script.
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case "$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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#
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# generate_header():
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# Args: $1 = Name of the header file
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# $2 = Input symbol list
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# $3 = Symbol type ("unprotected")
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#
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generate_header() {
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local header_file=$1
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local symbol_file=$2
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local symbol_type=$3
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if [ -f "${header_file}" ]; then
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rm -f -- "${header_file}"
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fi
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# If symbol_file exist preprocess it and find maximum name length
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if [ -s "${symbol_file}" ]; then
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# Remove any trailing CR, leading / trailing whitespace,
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# line comments, empty lines and symbol list markers.
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sed -i '
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s/\r$//
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s/^[[:space:]]*//
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s/[[:space:]]*$//
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/^#/d
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/^$/d
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/^\[abi_symbol_list\]$/d
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' "${symbol_file}"
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# Sort in byte order for kernel binary search at runtime
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LC_ALL=C sort -u -o "${symbol_file}" "${symbol_file}"
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# Trim white spaces & +1 for null termination
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local max_name_len=$(awk '
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{
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$1=$1;
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if ( length > L ) {
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L=length
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}
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} END { print ++L }' "${symbol_file}")
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else
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# Set to 1 to generate valid C header file
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local max_name_len=1
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fi
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# Header generation
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cat > "${header_file}" <<- EOT
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/*
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* DO NOT EDIT
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*
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* Build generated header file with ${symbol_type}
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*/
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#define NR_$(printf ${symbol_type} | tr [:lower:] [:upper:])_SYMBOLS \\
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$(printf '\t')(ARRAY_SIZE(gki_${symbol_type}_symbols))
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#define MAX_$(printf ${symbol_type} | tr [:lower:] [:upper:])_NAME_LEN (${max_name_len})
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static const char gki_${symbol_type}_symbols[][MAX_$(printf ${symbol_type} |
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tr [:lower:] [:upper:])_NAME_LEN] = {
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EOT
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# If a valid symbol_file present add symbols in an array except the 1st line
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if [ -s "${symbol_file}" ]; then
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sed -e 's/^[ \t]*/\t"/;s/[ \t]*$/",/' "${symbol_file}" >> "${header_file}"
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fi
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# Terminate the file
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echo "};" >> "${header_file}"
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}
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if [ "$(basename "${TARGET}")" = "gki_module_unprotected.h" ]; then
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# Union of vendor symbol lists
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GKI_VENDOR_SYMBOLS="${SYMBOL_LIST}"
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generate_header "${TARGET}" "${GKI_VENDOR_SYMBOLS}" "unprotected"
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else
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# Sorted list of exported symbols
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GKI_EXPORTED_SYMBOLS="include/config/abi_gki_protected_exports"
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if [ -z "${SYMBOL_LIST}" ]; then
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# Create empty list if ARCH doesn't have protected exports
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touch "${GKI_EXPORTED_SYMBOLS}"
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else
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# Make a temp copy to avoid changing source during pre-processing
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cp -f "${SYMBOL_LIST}" "${GKI_EXPORTED_SYMBOLS}"
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fi
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generate_header "${TARGET}" "${GKI_EXPORTED_SYMBOLS}" "protected_exports"
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fi
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