f4011fc8ae
scripts/gen_gki_modules_headers.sh:
Add an option to only keep unique symbols during the
symbol list prep phase as for header generation symbol
list needs to be unique union of all vendor symbol
lists in an ascending order.
This reduces the array size and improves the lookup
time for the binary search.
Bug: 232430739
Test: TH
Fixes: 13e6a16651 ("ANDROID: GKI: Header generation fix and improvements")
Change-Id: Ib6868f5a8eb0b3713e192bec111804e993e3d085
Signed-off-by: Ramji Jiyani <ramjiyani@google.com>
(cherry picked from commit 2069048a7398dd0dfde60c2e9b0d720c1e62f87e)
108 lines
2.6 KiB
Bash
Executable File
108 lines
2.6 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 White Spaces, empty lines and symbol list markers if any
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sed -i '/^[[:space:]]*$/d; /^#/d; /\[abi_symbol_list\]/d' "${symbol_file}"
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# Sort in byte order for kernel binary search at runtime
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LC_ALL=C sort -u -o "${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}" "${GKI_VENDOR_SYMBOLS}" "unprotected"
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else
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# Sorted list of exported symbols
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GKI_EXPORTED_SYMBOLS="${SYMBOL_LIST}"
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generate_header "${TARGET}" "${GKI_EXPORTED_SYMBOLS}" "protected_exports"
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fi
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