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; } }' | ||