From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1D238C10F14 for ; Thu, 3 Oct 2019 20:57:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E1B892086A for ; Thu, 3 Oct 2019 20:57:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="XEaU6WVA" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729047AbfJCU5H (ORCPT ); Thu, 3 Oct 2019 16:57:07 -0400 Received: from mail-qk1-f195.google.com ([209.85.222.195]:33407 "EHLO mail-qk1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728600AbfJCU5H (ORCPT ); Thu, 3 Oct 2019 16:57:07 -0400 Received: by mail-qk1-f195.google.com with SMTP id x134so3844435qkb.0; Thu, 03 Oct 2019 13:57:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=bp57aiVPoP/ArarNlq4U/eUFa2mtY+ziQY7Dly9CKtA=; b=XEaU6WVAoNoaMzE5jF26Y208agZnDaC/Mtb34NvHfq5gLxwJL+BkztzJl82rbEbZgA +LYj4N6kkLoe3lhR3wAcoHNJYvzgj0OVM1LhkV2+mM+PMegEZgsklMY0Lr/qlr/TCy9r lRFz9vF5v9nH/N4kiPc3fnwMQkBTNcNgB63ZBRaI4Ssu/upuBwWKmzj1QVj5tmFwLUUL ajnCd5DO4m4vzQ40yTTemj8OM5uDK4SErGhDp40vh3mPw64Wkq0uu5H8saFIpBDmfx2G YMS+lPu3d0NP+Qc5TKX/if/kH2Eg3UYA175RAxt7B/IWPLYkS1wxggvSFV/9gIKXm0RU dg6w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=bp57aiVPoP/ArarNlq4U/eUFa2mtY+ziQY7Dly9CKtA=; b=ueZhtJZP2cqcDHPrnCBpLLph8MgSwhZuOYBGlShpF/NTIZ/pHEHEV/9n4HqedDoBfT STu8D3g1Ll63JZL3yrFLzSoGGKaAS4fvdN0VOuXtUS0RcWaTuLhW5HzdQmpiyr2SBBBo F3/zzsuWDWs57gdyWNC32QpFAaIxHbN/wjJtgyymo6rue+ajHRSXDFDwEH26gw00xBJc v4stCXx8GmdAThEu8eGGyxF/KJ8orW3ERP0Him5uIVz+7MSw3Nw+1I6qbDiINMrMD3iQ mepsKn5B3G1rgxmH4PtFmmvaGd9ASeNMneK5pAfBMcApQ8nbbu3+bITi9dwCeWGnjI9t Ms7Q== X-Gm-Message-State: APjAAAWQ8ja0YPY/Kj+d8GR56f0wrPKz29taVpJiLgDn77wzeFSxKbnU lJ0ityBEWyg2RdWs1Box4CrEtkC5pk5tE4V4kIs= X-Google-Smtp-Source: APXvYqz/DqBXRpd/AGAchrTryaQgtTR6yCMcHPgG8vs8W0eES8536bJuxlv3V2bAxKBuS3nGN1jR10T8m1bhqwLKQQ0= X-Received: by 2002:a05:620a:113a:: with SMTP id p26mr6643276qkk.353.1570136225160; Thu, 03 Oct 2019 13:57:05 -0700 (PDT) MIME-Version: 1.0 References: <20191002234512.25902-1-daniel@iogearbox.net> <20191002234512.25902-2-daniel@iogearbox.net> In-Reply-To: <20191002234512.25902-2-daniel@iogearbox.net> From: Song Liu Date: Thu, 3 Oct 2019 13:56:53 -0700 Message-ID: Subject: Re: [PATCH bpf-next 2/2] bpf: Add loop test case with 32 bit reg comparison against 0 To: Daniel Borkmann Cc: Alexei Starovoitov , bpf , Networking Content-Type: text/plain; charset="UTF-8" Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org On Wed, Oct 2, 2019 at 5:30 PM Daniel Borkmann wrote: > > Add a loop test with 32 bit register against 0 immediate: > > # ./test_verifier 631 > #631/p taken loop with back jump to 1st insn, 2 OK > > Disassembly: > > [...] > 1b: test %edi,%edi > 1d: jne 0x0000000000000014 > [...] > > Pretty much similar to prior "taken loop with back jump to 1st > insn" test case just as jmp32 variant. > > Signed-off-by: Daniel Borkmann Acked-by: Song Liu