The following commit has been merged into the objtool/core branch of tip: Commit-ID: 21e350233b07619dbfc3ce606ff1fc468fce2d82 Gitweb: https://git.kernel.org/tip/21e350233b07619dbfc3ce606ff1fc468fce2d82 Author: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> AuthorDate: Thu, 21 Apr 2022 14:56:55 -07:00 Committer: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> CommitterDate: Thu, 12 May 2022 10:08:43 -07:00 scripts: Create objdump-func helper script 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@xxxxxxxxxxxxx> Acked-by: Borislav Petkov <bp@xxxxxxx> Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> Link: https://lore.kernel.org/r/3eb3f091fd6bd9caba50392ceab98ce756804f3b.1650578171.git.jpoimboe@xxxxxxxxxx --- scripts/objdump-func | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100755 scripts/objdump-func diff --git a/scripts/objdump-func b/scripts/objdump-func new file mode 100755 index 0000000..4eb463d --- /dev/null +++ b/scripts/objdump-func @@ -0,0 +1,29 @@ +#!/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; } }'
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