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#!/usr/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Disassemble a single function.
#
# usage: objdump-func <file> <func> [<func> ...]
set -o errexit
set -o nounset
OBJDUMP="${CROSS_COMPILE:-}objdump"
command -v gawk >/dev/null 2>&1 || die "gawk isn't installed"
usage() {
echo "usage: objdump-func <file> <func> [<func> ...]" >&2
exit 1
}
[[ $# -lt 2 ]] && usage
OBJ=$1; shift
FUNCS=("$@")
${OBJDUMP} -wdr $OBJ | gawk -M -v _funcs="${FUNCS[*]}" '
BEGIN { split(_funcs, funcs); }
/^$/ { func_match=0; }
/<.*>:/ {
f = gensub(/.*<(.*)>:/, "\\1", 1);
for (i in funcs) {
# match compiler-added suffixes like ".cold", etc
if (f ~ "^" funcs[i] "(\\..*)?") {
func_match = 1;
base = strtonum("0x" $1);
break;
}
}
}
{
if (func_match) {
addr = strtonum("0x" $1);
printf("%04x ", addr - base);
print;
}
}'