linux-kernel - [PATCH v2 13/25] scripts: Create objdump-func helper script

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Message-Id: <ab37c23d28a8b9cf7a6707cc5af5e1aef80ba4a3.1650300597.git.jpoimboe@redhat.com>
Date:   Mon, 18 Apr 2022 09:50:32 -0700
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     x86@...nel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, Miroslav Benes <mbenes@...e.cz>
Subject: [PATCH v2 13/25] 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@...radead.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
 scripts/objdump-func | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100755 scripts/objdump-func

diff --git a/scripts/objdump-func b/scripts/objdump-func
new file mode 100755
index 000000000000..140646c456fc
--- /dev/null
+++ b/scripts/objdump-func
@@ -0,0 +1,18 @@
+#!/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 awk >/dev/null 2>&1 || die "awk isn't installed"
+
+OBJ=$1; shift
+FUNC=$1; shift
+
+${OBJDUMP} -wdr $@ $OBJ | awk "/^\$/ { P=0; } /$FUNC[^>]*>:\$/ { P=1; O=strtonum(\"0x\" \$1); } { if (P) { o=strtonum(\"0x\" \$1); printf(\"%04x \", o-O); print \$0; } }"
-- 
2.34.1