Add a simple script which disassembles a single function from an object file. Comes in handy for objtool warnings and kernel stack traces.
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| 1 | +#!/bin/bash | |
| 2 | +# SPDX-License-Identifier: GPL-2.0 | |
| 3 | +# | |
| 4 | +# Disassemble a single function. | |
| 5 | +# | |
| 6 | +# usage: objdump-func <file> <func> | |
| 7 | + | |
| 8 | +set -o errexit | |
| 9 | +set -o nounset | |
| 10 | + | |
| 11 | +OBJDUMP="${CROSS_COMPILE:-}objdump" | |
| 12 | + | |
| 13 | +command -v gawk >/dev/null 2>&1 || die "gawk isn't installed" | |
| 14 | + | |
| 15 | +usage() { | |
| 16 | + echo "usage: objdump-func <file> <func>" >&2 | |
| 17 | + exit 1 | |
| 18 | +} | |
| 19 | + | |
| 20 | +[[ $# -lt 2 ]] && usage | |
| 21 | + | |
| 22 | +OBJ=$1; shift | |
| 23 | +FUNC=$1; shift | |
| 24 | + | |
| 25 | +# Secret feature to allow adding extra objdump args at the end | |
| 26 | +EXTRA_ARGS=$@ | |
| 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; } }' | |