From nobody Mon May 11 00:10:31 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0FAA4C433F5 for ; Thu, 21 Apr 2022 21:57:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1442265AbiDUWAA (ORCPT ); Thu, 21 Apr 2022 18:00:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46524 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1442261AbiDUV75 (ORCPT ); Thu, 21 Apr 2022 17:59:57 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 4B0AC4EDD0 for ; Thu, 21 Apr 2022 14:57:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1650578222; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=b3F6IsWh0LkQJX9Kt+TRrqzc1cDTYsznRdWe3zbjtGE=; b=aqFL0Z9eGMpV+UWmzeCYFqL5ndWp/OHSK/tYJRSEqlieuiyw/cm1hzHu8x4GsT/u+lBNsO yhgtM7jQ8lMOBpCNOGcj0g1Gded2EtsDeaxb4SDt3wc+U6eNFep3Nczb5+Nh2TwsAU05C5 Kl8iEzV5El5e32k1jGdpx29F5tCEmY8= Received: from mail-qt1-f199.google.com (mail-qt1-f199.google.com [209.85.160.199]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-601-4v1NVh_UNNCJoT6fJ7Xwlw-1; Thu, 21 Apr 2022 17:57:01 -0400 X-MC-Unique: 4v1NVh_UNNCJoT6fJ7Xwlw-1 Received: by mail-qt1-f199.google.com with SMTP id r16-20020ac87950000000b002f34f162c75so1556794qtt.9 for ; Thu, 21 Apr 2022 14:57:01 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=b3F6IsWh0LkQJX9Kt+TRrqzc1cDTYsznRdWe3zbjtGE=; b=0WJ4rrJ+A2Gh53VDZU0yYLVvojkNHCPkrgWyZj4qVF9K0h05KlNHpZ6NPJFni06xru WA0zE1ZvUc1bBLcrTIzZ1JlDE/wn+GzYpaRXvrbxc9tDqiTzUoPP+VH2nnDnVA23EDsj GcLRnr5HEwFqdIa1NAV3JR35nLdYdaabC5fmS9ABpzw96TI77bAfFYrnT7Q1YU1jWAGX IFKTCVtO5BP8VrRwDbknAyL+KIWraB43dZ0cmf3IXydUuPn6Lh10O89544dAA6Eqv4Ag U4/ye6281ZQJdTGmKoMk3xZX1aGH0chgalXP4x6wIcZy+5iJ6he350CvlzvuEMfsIXCO 07YQ== X-Gm-Message-State: AOAM531e34c1ZbJGHL864ltN1XzyTKEpfnJ8VsAwX94FkMRtJ/2JmOar I2PnTQSbtUZo5A/w/8f10NlRnwJoFEi6luOOsUfiEpv8RnGcE9VQa4dLLKHg9sDJRKh9uDXwR+1 13SpQYBDWgZ6sGT6Pexbd0g8F X-Received: by 2002:a05:622a:13c8:b0:2f3:5421:d64d with SMTP id p8-20020a05622a13c800b002f35421d64dmr1144665qtk.43.1650578220713; Thu, 21 Apr 2022 14:57:00 -0700 (PDT) X-Google-Smtp-Source: ABdhPJzlqT6p8GJTvYLpNgdKfIrwJjw7y9Ih1JMFX4NW2WPy+npSK3dXf57J6Qf9LAd37098YRhwhg== X-Received: by 2002:a05:622a:13c8:b0:2f3:5421:d64d with SMTP id p8-20020a05622a13c800b002f35421d64dmr1144655qtk.43.1650578220469; Thu, 21 Apr 2022 14:57:00 -0700 (PDT) Received: from treble.redhat.com ([2600:1700:6e32:6c00::35]) by smtp.gmail.com with ESMTPSA id w82-20020a376255000000b0069ee3f0ae63sm71493qkb.45.2022.04.21.14.56.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Apr 2022 14:57:00 -0700 (PDT) From: Josh Poimboeuf To: Peter Zijlstra Cc: linux-kernel@vger.kernel.org, x86@kernel.org, Miroslav Benes , Borislav Petkov , Borislav Petkov Subject: [PATCH v4] scripts: Create objdump-func helper script Date: Thu, 21 Apr 2022 14:56:55 -0700 Message-Id: <3eb3f091fd6bd9caba50392ceab98ce756804f3b.1650578171.git.jpoimboe@redhat.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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 Acked-by: Borislav Petkov Signed-off-by: Josh Poimboeuf --- v4: - allow extra args to be provided at the end - match ".cold", etc 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 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 + +set -o errexit +set -o nounset + +OBJDUMP=3D"${CROSS_COMPILE:-}objdump" + +command -v gawk >/dev/null 2>&1 || die "gawk isn't installed" + +usage() { + echo "usage: objdump-func " >&2 + exit 1 +} + +[[ $# -lt 2 ]] && usage + +OBJ=3D$1; shift +FUNC=3D$1; shift + +# Secret feature to allow adding extra objdump args at the end +EXTRA_ARGS=3D$@ + +# Note this also matches compiler-added suffixes like ".cold", etc +${OBJDUMP} -wdr $EXTRA_ARGS $OBJ | gawk -M -v f=3D$FUNC '/^$/ { P=3D0; } $= 0 ~ "<" f "(\\..*)?>:" { P=3D1; O=3Dstrtonum("0x" $1); } { if (P) { o=3Dstr= tonum("0x" $1); printf("%04x ", o-O); print $0; } }' --=20 2.34.1