1#!/bin/bash
 2# SPDX-License-Identifier: GPL-2.0
 3#
 4# Disassemble a single function.
 5#
 6# usage: objdump-func <file> <func>
 7
 8set -o errexit
 9set -o nounset
10
11OBJDUMP="${CROSS_COMPILE:-}objdump"
12
13command -v gawk >/dev/null 2>&1 || die "gawk isn't installed"
14
15usage() {
16	echo "usage: objdump-func <file> <func>" >&2
17	exit 1
18}
19
20[[ $# -lt 2 ]] && usage
21
22OBJ=$1; shift
23FUNC=$1; shift
24
25# Secret feature to allow adding extra objdump args at the end
26EXTRA_ARGS=$@
27
28# Note this also matches compiler-added suffixes like ".cold", etc
29${OBJDUMP} -wdr $EXTRA_ARGS $OBJ | gawk -M -v f=$FUNC '/^$/ { P=0; } $0 ~ "<" f "(\\..*)?>:" { P=1; O=strtonum("0x" $1); } { if (P) { o=strtonum("0x" $1); printf("%04x ", o-O); print $0; } }'