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authorJosh Poimboeuf <jpoimboe@redhat.com>2022-04-22 00:56:55 +0300
committerJosh Poimboeuf <jpoimboe@kernel.org>2022-05-12 20:08:43 +0300
commit21e350233b07619dbfc3ce606ff1fc468fce2d82 (patch)
treea97ebd180bb315382abc4a71bd872325681213ee /scripts
parent4bc78005887f6fca60b624822943708652fda01a (diff)
downloadlinux-21e350233b07619dbfc3ce606ff1fc468fce2d82.tar.xz
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@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
Diffstat (limited to 'scripts')
-rwxr-xr-xscripts/objdump-func29
1 files changed, 29 insertions, 0 deletions
diff --git a/scripts/objdump-func b/scripts/objdump-func
new file mode 100755
index 000000000000..4eb463dd9f52
--- /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; } }'