From nobody Sun Feb 8 14:34:36 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 2FE49C77B7D for ; Thu, 18 May 2023 11:08:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230499AbjERLIa (ORCPT ); Thu, 18 May 2023 07:08:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42818 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230469AbjERLI2 (ORCPT ); Thu, 18 May 2023 07:08:28 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7DC841FE3; Thu, 18 May 2023 04:08:03 -0700 (PDT) Date: Thu, 18 May 2023 11:08:00 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1684408081; h=from:from:sender:sender:reply-to: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: in-reply-to:in-reply-to:references:references; bh=SnYAIDQ8NLqV20AkYg6dGovI2YrcEci0y0Arz8TfA0E=; b=Itgm20SoQ7oDsj87UPR/DD4Bkus4v39zJeGXIIKHXunR6qOUC1+tLAvCk1ZARTZAUSiB94 2I1MJjd206T7TOfONgkGw12N/otOqgX5b3Seqo2Id8Xpeo8KCGUS+ZDmEzzql6QUifUcnY MrIFQux9guhv3gZWFhxU9nm2eRxLorzUIsbe9JsZHWdQmZU+T2bzjmodh3gSQ+dGuQjLsk b2p824/cKcIHQcxwTGiAzBPvkcZyWOI2OxBEyTqCsw/vTNJidMf8BBa+1D6rR2Y4rbvSc3 9OwhijMsjvP6sqKiaKPPjOtCGD7VDgKmyMzlFl4TNU5S1LbAFendpEN20y0keQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1684408081; h=from:from:sender:sender:reply-to: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: in-reply-to:in-reply-to:references:references; bh=SnYAIDQ8NLqV20AkYg6dGovI2YrcEci0y0Arz8TfA0E=; b=/cJ8Ipd6SpW5XWi07GSvyxcC3Z46l+ogCzGa61d42QAcanTQKB60s9fQZvJu1fPRutICim sIuedbrJl+YtKBDw== From: "tip-bot2 for Josh Poimboeuf" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: objtool/core] objtool: Move noreturn function list to separate file Cc: Peter Zijlstra , Miroslav Benes , Josh Poimboeuf , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: References: MIME-Version: 1.0 Message-ID: <168440808078.404.10229426089395328822.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the objtool/core branch of tip: Commit-ID: 6245ce4ab670166efcdae843c35c14e4c0811aa3 Gitweb: https://git.kernel.org/tip/6245ce4ab670166efcdae843c35c14e4c= 0811aa3 Author: Josh Poimboeuf AuthorDate: Tue, 18 Apr 2023 14:27:54 -07:00 Committer: Josh Poimboeuf CommitterDate: Tue, 16 May 2023 06:31:55 -07:00 objtool: Move noreturn function list to separate file This makes it a little cleaner and easier to maintain. Suggested-by: Peter Zijlstra Reviewed-by: Miroslav Benes Link: https://lore.kernel.org/r/cecacf07a69a244c74474c18b7652627de67a528.16= 81853186.git.jpoimboe@kernel.org Signed-off-by: Josh Poimboeuf --- tools/objtool/Documentation/objtool.txt | 5 +-- tools/objtool/check.c | 44 +---------------------- tools/objtool/noreturns.h | 45 ++++++++++++++++++++++++- 3 files changed, 50 insertions(+), 44 deletions(-) create mode 100644 tools/objtool/noreturns.h diff --git a/tools/objtool/Documentation/objtool.txt b/tools/objtool/Docume= ntation/objtool.txt index f9345e0..fe39c2a 100644 --- a/tools/objtool/Documentation/objtool.txt +++ b/tools/objtool/Documentation/objtool.txt @@ -306,9 +306,8 @@ the objtool maintainers. 3. file.o: warning: objtool: foo+0x48c: bar() is missing a __noreturn anno= tation =20 The call from foo() to bar() doesn't return, but bar() is missing the - __noreturn annotation. NOTE: In addition to adding the __noreturn - annotation, the function name also needs to be added to - 'global_noreturns' in tools/objtool/check.c. + __noreturn annotation. NOTE: In addition to annotating the function + with __noreturn, please also add it to tools/objtool/noreturns.h. =20 4. file.o: warning: objtool: func(): can't find starting instruction or diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 8c2762d..a13c257 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -192,49 +192,11 @@ static bool __dead_end_function(struct objtool_file *= file, struct symbol *func, struct instruction *insn; bool empty =3D true; =20 - /* - * Unfortunately these have to be hard coded because the noreturn - * attribute isn't provided in ELF data. Keep 'em sorted. - */ +#define NORETURN(func) __stringify(func), static const char * const global_noreturns[] =3D { - "__invalid_creds", - "__module_put_and_kthread_exit", - "__reiserfs_panic", - "__stack_chk_fail", - "__ubsan_handle_builtin_unreachable", - "arch_call_rest_init", - "arch_cpu_idle_dead", - "btrfs_assertfail", - "cpu_bringup_and_idle", - "cpu_startup_entry", - "do_exit", - "do_group_exit", - "do_task_dead", - "ex_handler_msr_mce", - "fortify_panic", - "hlt_play_dead", - "hv_ghcb_terminate", - "kthread_complete_and_exit", - "kthread_exit", - "kunit_try_catch_throw", - "machine_real_restart", - "make_task_dead", - "mpt_halt_firmware", - "nmi_panic_self_stop", - "panic", - "panic_smp_self_stop", - "rest_init", - "rewind_stack_and_make_dead", - "sev_es_terminate", - "snp_abort", - "start_kernel", - "stop_this_cpu", - "usercopy_abort", - "x86_64_start_kernel", - "x86_64_start_reservations", - "xen_cpu_bringup_again", - "xen_start_kernel", +#include "noreturns.h" }; +#undef NORETURN =20 if (!func) return false; diff --git a/tools/objtool/noreturns.h b/tools/objtool/noreturns.h new file mode 100644 index 0000000..cede606 --- /dev/null +++ b/tools/objtool/noreturns.h @@ -0,0 +1,45 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +/* + * This is a (sorted!) list of all known __noreturn functions in the kerne= l. + * It's needed for objtool to properly reverse-engineer the control flow g= raph. + * + * Yes, this is unfortunate. A better solution is in the works. + */ +NORETURN(__invalid_creds) +NORETURN(__module_put_and_kthread_exit) +NORETURN(__reiserfs_panic) +NORETURN(__stack_chk_fail) +NORETURN(__ubsan_handle_builtin_unreachable) +NORETURN(arch_call_rest_init) +NORETURN(arch_cpu_idle_dead) +NORETURN(btrfs_assertfail) +NORETURN(cpu_bringup_and_idle) +NORETURN(cpu_startup_entry) +NORETURN(do_exit) +NORETURN(do_group_exit) +NORETURN(do_task_dead) +NORETURN(ex_handler_msr_mce) +NORETURN(fortify_panic) +NORETURN(hlt_play_dead) +NORETURN(hv_ghcb_terminate) +NORETURN(kthread_complete_and_exit) +NORETURN(kthread_exit) +NORETURN(kunit_try_catch_throw) +NORETURN(machine_real_restart) +NORETURN(make_task_dead) +NORETURN(mpt_halt_firmware) +NORETURN(nmi_panic_self_stop) +NORETURN(panic) +NORETURN(panic_smp_self_stop) +NORETURN(rest_init) +NORETURN(rewind_stack_and_make_dead) +NORETURN(sev_es_terminate) +NORETURN(snp_abort) +NORETURN(start_kernel) +NORETURN(stop_this_cpu) +NORETURN(usercopy_abort) +NORETURN(x86_64_start_kernel) +NORETURN(x86_64_start_reservations) +NORETURN(xen_cpu_bringup_again) +NORETURN(xen_start_kernel)