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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C963AE9413F for ; Sat, 7 Oct 2023 04:46:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343550AbjJGEpK (ORCPT ); Sat, 7 Oct 2023 00:45:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36708 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343521AbjJGEpG (ORCPT ); Sat, 7 Oct 2023 00:45:06 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 773A8C2 for ; Fri, 6 Oct 2023 21:45:05 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id 3f1490d57ef6-d81486a0382so3728932276.0 for ; Fri, 06 Oct 2023 21:45:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1696653904; x=1697258704; darn=vger.kernel.org; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=yPsPdGtdKQ/v+DaiUF2STLjrD0JxItabAMPBxz4xd3o=; b=qBv3h5ZSjnKAZMcIR3rEeG8D9YBorLBnlRnH+5KnfHKBS/njECi+rzSr14+qRGsklf OA8RdosWCQCLkCXcBxB8kcS3RN5zjO+cXmz1DT6eI0Xkr53FJvXzsvxMrDHnQXYlSdnG MKYAD2nbqyZ61Nlbo/KyIuiCTyRoPE78HokmLxZlwM9wzigPoFzhzm4dHcA2vSZDV7lc BVQKApSCQEyfk7lHyBTflDKh88lfNvX/GjnDknT6gQFr7AaaybrEpok9ZUqwtW2m7iNx ets0NELxQBxspjtd53+OqhOPGcULjXiFdNz3WA07xBLO5nWk11MYLV2DXAS0cHeBQLAN BYsQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696653904; x=1697258704; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=yPsPdGtdKQ/v+DaiUF2STLjrD0JxItabAMPBxz4xd3o=; b=seebzQINg6B1C8kNJ8NT7ZPi6YoT8ZBbYtWeC7qxlB7j36HZHrITRjW+3JlYuRwnYN K03PY/quRGN7TQ5QN6rlo1fn2oepfoQ7kNuHmU41dgfzeI0lofU5QSabaLvuTRdkhUcB 1hWcTsfBqPxE99wLsIwLp4wupyXuZcchpK+UoyCQCMIQndQ1fyBNqxxDRyIAJzcgJ1MM VLtXtmSz1Gy/rRH89aR82VJuhJFcHwS/YKDvJQ+4afOtkejEwtpg8J6vww+lObLTP5Ee TIO8r6CQQVTCTRMXLejwUKpr494+Jk39kCoI2uxNnrg42J7Glc159OYKm7TzIdBEU5th MvJg== X-Gm-Message-State: AOJu0YwhnwhlAve9uYgypeOF1KgYABUXtH/zzdydcz1DM1gn4NHBFKsv tdtov+Ao9SYaGlKjq/oeQRhkh3vbRw2i X-Google-Smtp-Source: AGHT+IHzbgs54ou2YatAT0qKH8s7DIqxUdn8GunFexNWDbAOBMS09tyfscwUD2Nf5+CdRIxy28Y311Twj5CM X-Received: from irogers.svl.corp.google.com ([2620:15c:2a3:200:7031:b36b:6c77:bfd0]) (user=irogers job=sendgmr) by 2002:a25:248:0:b0:d8c:cc9b:81cc with SMTP id 69-20020a250248000000b00d8ccc9b81ccmr148880ybc.3.1696653904627; Fri, 06 Oct 2023 21:45:04 -0700 (PDT) Date: Fri, 6 Oct 2023 21:44:39 -0700 In-Reply-To: <20231007044439.25171-1-irogers@google.com> Message-Id: <20231007044439.25171-2-irogers@google.com> Mime-Version: 1.0 References: <20231007044439.25171-1-irogers@google.com> X-Mailer: git-send-email 2.42.0.609.gbb76f46606-goog Subject: [PATCH v6 2/2] bpftool: Align bpf_load_and_run_opts insns and data From: Ian Rogers To: Quentin Monnet , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Matt Smith , bpf@vger.kernel.org, linux-kernel@vger.kernel.org, Alan Maguire Cc: Ian Rogers Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org A C string lacks alignment so use aligned arrays to avoid potential alignment problems. Switch to using sizeof (less 1 for the \0 terminator) rather than a hardcode size constant. Signed-off-by: Ian Rogers Acked-by: Quentin Monnet --- tools/bpf/bpftool/gen.c | 43 ++++++++++++++++++++++------------------- 1 file changed, 23 insertions(+), 20 deletions(-) diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c index 882bf8e6e70e..ee3ce2b8000d 100644 --- a/tools/bpf/bpftool/gen.c +++ b/tools/bpf/bpftool/gen.c @@ -708,17 +708,22 @@ static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *h codegen("\ \n\ - skel->%1$s = skel_prep_map_data((void *)\"\\ \n\ - ", ident); + { \n\ + static const char data[] __attribute__((__aligned__(8))) = \"\\\n\ + "); mmap_data = bpf_map__initial_value(map, &mmap_size); print_hex(mmap_data, mmap_size); codegen("\ \n\ - \", %1$zd, %2$zd); \n\ - if (!skel->%3$s) \n\ - goto cleanup; \n\ - skel->maps.%3$s.initial_value = (__u64) (long) skel->%3$s;\n\ - ", bpf_map_mmap_sz(map), mmap_size, ident); + \"; \n\ + \n\ + skel->%1$s = skel_prep_map_data((void *)data, %2$zd,\n\ + sizeof(data) - 1);\n\ + if (!skel->%1$s) \n\ + goto cleanup; \n\ + skel->maps.%1$s.initial_value = (__u64) (long) skel->%1$s;\n\ + } \n\ + ", ident, bpf_map_mmap_sz(map)); } codegen("\ \n\ @@ -733,32 +738,30 @@ static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *h { \n\ struct bpf_load_and_run_opts opts = {}; \n\ int err; \n\ - \n\ - opts.ctx = (struct bpf_loader_ctx *)skel; \n\ - opts.data_sz = %2$d; \n\ - opts.data = (void *)\"\\ \n\ + static const char opts_data[] __attribute__((__aligned__(8))) = \"\\\n\ ", - obj_name, opts.data_sz); + obj_name); print_hex(opts.data, opts.data_sz); codegen("\ \n\ \"; \n\ + static const char opts_insn[] __attribute__((__aligned__(8))) = \"\\\n\ "); - - codegen("\ - \n\ - opts.insns_sz = %d; \n\ - opts.insns = (void *)\"\\ \n\ - ", - opts.insns_sz); print_hex(opts.insns, opts.insns_sz); codegen("\ \n\ \"; \n\ + \n\ + opts.ctx = (struct bpf_loader_ctx *)skel; \n\ + opts.data_sz = sizeof(opts_data) - 1; \n\ + opts.data = (void *)opts_data; \n\ + opts.insns_sz = sizeof(opts_insn) - 1; \n\ + opts.insns = (void *)opts_insn; \n\ + \n\ err = bpf_load_and_run(&opts); \n\ if (err < 0) \n\ return err; \n\ - ", obj_name); + "); bpf_object__for_each_map(map, obj) { const char *mmap_flags; -- 2.42.0.609.gbb76f46606-goog