From nobody Sun Feb 8 18:27:36 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 07998C4332F for ; Wed, 8 Nov 2023 14:29:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235724AbjKHO3k (ORCPT ); Wed, 8 Nov 2023 09:29:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39686 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234536AbjKHO3O (ORCPT ); Wed, 8 Nov 2023 09:29:14 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D8ACB25B9 for ; Wed, 8 Nov 2023 06:29:04 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7C4B5C433CA; Wed, 8 Nov 2023 14:29:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699453744; bh=nvQ4v2RfL+rW6LQ5jLmbS0C2Mc8Q/AnQKonB+7bHXEo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=d1ZTNI3bsnagIRwoTIWBdgh0NWIq/kVuR8XOYSIR/+TXg9y1o476kolNHDpAmb1Hu Q7r2iozHRvMq+VkPxWzX6LL3ZEGGJjynRUSILiURkMlULYh9gLKNlfXoZALzB5doKo +2OjAnM1p6vGX0IqFqt241xtd/kqODRrugO7yi+MoilwHKsoThc/5X4eBC4A2BSSvh fi8w55G6EgaXn5kcuNkiZFhr9PZ/SfDZgnDZq8LlOEN1UYayDdCa3/HOiQhFuuPkHC pgnJ/0oBP5jb+rw/NlTTMFCY8LubXUFNMNUK1lFcv1salSHfaz3MimipFWlSlvRqJY fFELcCbHaSUXw== From: "Masami Hiramatsu (Google)" To: Alexei Starovoitov , Steven Rostedt , Florent Revest Cc: linux-trace-kernel@vger.kernel.org, LKML , Martin KaFai Lau , bpf , Sven Schnelle , Alexei Starovoitov , Jiri Olsa , Arnaldo Carvalho de Melo , Daniel Borkmann , Alan Maguire , Mark Rutland , Peter Zijlstra , Thomas Gleixner , Guo Ren Subject: [RFC PATCH v2 24/31] tracing: Add ftrace_partial_regs() for converting ftrace_regs to pt_regs Date: Wed, 8 Nov 2023 23:28:58 +0900 Message-Id: <169945373844.55307.8967183255641266616.stgit@devnote2> X-Mailer: git-send-email 2.34.1 In-Reply-To: <169945345785.55307.5003201137843449313.stgit@devnote2> References: <169945345785.55307.5003201137843449313.stgit@devnote2> User-Agent: StGit/0.19 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Masami Hiramatsu (Google) Add ftrace_partial_regs() which converts the ftrace_regs to pt_regs. If the architecture defines its own ftrace_regs, this copies partial registers to pt_regs and returns it. If not, ftrace_regs is the same as pt_regs and ftrace_partial_regs() will return ftrace_regs::regs. Signed-off-by: Masami Hiramatsu (Google) Acked-by: Florent Revest --- Changes from previous series: NOTHING, just forward ported. --- arch/arm64/include/asm/ftrace.h | 11 +++++++++++ include/linux/ftrace.h | 17 +++++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/arch/arm64/include/asm/ftrace.h b/arch/arm64/include/asm/ftrac= e.h index ab158196480c..5ad24f315d52 100644 --- a/arch/arm64/include/asm/ftrace.h +++ b/arch/arm64/include/asm/ftrace.h @@ -137,6 +137,17 @@ ftrace_override_function_with_return(struct ftrace_reg= s *fregs) fregs->pc =3D fregs->lr; } =20 +static __always_inline struct pt_regs * +ftrace_partial_regs(const struct ftrace_regs *fregs, struct pt_regs *regs) +{ + memcpy(regs->regs, fregs->regs, sizeof(u64) * 9); + regs->sp =3D fregs->sp; + regs->pc =3D fregs->pc; + regs->regs[29] =3D fregs->fp; + regs->regs[30] =3D fregs->lr; + return regs; +} + int ftrace_regs_query_register_offset(const char *name); =20 int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index c87e4debf698..c871b195730c 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -172,6 +172,23 @@ static __always_inline struct pt_regs *ftrace_get_regs= (struct ftrace_regs *fregs return arch_ftrace_get_regs(fregs); } =20 +#if !defined(CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS) || \ + defined(CONFIG_HAVE_PT_REGS_TO_FTRACE_REGS_CAST) + +static __always_inline struct pt_regs * +ftrace_partial_regs(struct ftrace_regs *fregs, struct pt_regs *regs) +{ + /* + * If CONFIG_HAVE_PT_REGS_TO_FTRACE_REGS_CAST=3Dy, ftrace_regs memory + * layout is the same as pt_regs. So always returns that address. + * Since arch_ftrace_get_regs() will check some members and may return + * NULL, we can not use it. + */ + return &fregs->regs; +} + +#endif /* !CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS || CONFIG_HAVE_PT_REGS_TO_= FTRACE_REGS_CAST */ + /* * When true, the ftrace_regs_{get,set}_*() functions may be used on fregs. * Note: this can be true even when ftrace_get_regs() cannot provide a pt_= regs.