forked from mirrors/linux
21e350233b
Add a simple script which disassembles a single function from an object file. Comes in handy for objtool warnings and kernel stack traces. Originally-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Borislav Petkov <bp@suse.de> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Link: https://lore.kernel.org/r/3eb3f091fd6bd9caba50392ceab98ce756804f3b.1650578171.git.jpoimboe@redhat.com
29 lines
711 B
Bash
Executable file
29 lines
711 B
Bash
Executable file
#!/bin/bash
|
|
# SPDX-License-Identifier: GPL-2.0
|
|
#
|
|
# Disassemble a single function.
|
|
#
|
|
# usage: objdump-func <file> <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>" >&2
|
|
exit 1
|
|
}
|
|
|
|
[[ $# -lt 2 ]] && usage
|
|
|
|
OBJ=$1; shift
|
|
FUNC=$1; shift
|
|
|
|
# Secret feature to allow adding extra objdump args at the end
|
|
EXTRA_ARGS=$@
|
|
|
|
# Note this also matches compiler-added suffixes like ".cold", etc
|
|
${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; } }'
|