blob: 39e99438abe72d626d45b2a713b940a82fb32c0f [file] [log] [blame]
#!/usr/bin/env bash
# Copyright 2020 The Fuchsia Authors
#
# Use of this source code is governed by a MIT-style
# license that can be found in the LICENSE file or at
# https://opensource.org/licenses/MIT
set -e -o pipefail
readonly NM="$1"
readonly KERNEL_IMAGE_FILE="$(<"$2")"
readonly KERNEL_SYMBOL_FILE="$(<"$3")"
readonly OUTPUT="$4"
readonly DEPFILE="$5"
readonly BASE_SYMBOL=__code_start
readonly VERSION_SYMBOL=kVersionString
readonly NM_REGEXP="$BASE_SYMBOL|$VERSION_SYMBOL"
trap 'rm -f "$DEPFILE"' ERR HUP INT TERM
grok() {
local addr size type symbol base_addr version_string_addr version_string_size
while read addr size type symbol; do
if [ -z "$symbol" ]; then
# GNU nm omits the size column when it's zero.
symbol="$type"
type="$size"
size=0
fi
case "$symbol" in
$BASE_SYMBOL)
((base_addr="0x$addr"))
;;
$VERSION_SYMBOL)
((version_string_addr="0x$addr"))
((version_string_size="0x$size"))
;;
esac
done
if [[ -z "$base_addr" || -z "$version_string_addr" || -z "$version_string_size" ]]; then
echo >&2 "$0: cannot find version string address details"
exit 2
fi
((version_string_addr-=base_addr))
local template='// Generated by %s. DO NOT EDIT!
#define KERNEL_IMAGE_FILE "%s"
#define VERSION_STRING_OFFSET %#x
#define VERSION_STRING_SIZE %u
'
local new_contents="$(printf "$template" "$0" "$KERNEL_IMAGE_FILE" $version_string_addr $version_string_size)"
if [ ! -r "$OUTPUT" ] || [ "$(<"$OUTPUT")" != "$new_contents" ]; then
echo "$new_contents" > "$OUTPUT"
fi
}
echo "$OUTPUT: $KERNEL_SYMBOL_FILE" > "$DEPFILE"
"$NM" -S "$KERNEL_SYMBOL_FILE" | egrep "$NM_REGEXP" | grok