From patchwork Tue Feb 6 15:12:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 13547459 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 13432135A46; Tue, 6 Feb 2024 15:12:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707232367; cv=none; b=ASvLUZi2/8qRmYa0B9bTMoed13OIpB6IjJGLl0xALKLMT+EjCyQoddq92wGi3oHNX7LO21kGfFvFPufViagAIIc2kY35hrVHwPRXnoouNeqZHrbvfZQvFhoaI/LvpO4/PbGP+Y/kCcEEXvE7S0FuTJIb4mEG80EzyOdeQs227jY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707232367; c=relaxed/simple; bh=JC1iyaIU7mWHHBTGXNCiN27YHUuUtROsifUJHNlxJlc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=ZtaymrTQwyQljcdkOL1+oxplOi1MBhzAHrxNCSUWke+v2HTYhD6fF7vRFPF13kItb8zPLxbpR7H2gepT6O1lbZX4ug46/W+Y2nPtOO/9j6e/ONNNF1apZyUtjzJusWGU42pnLtMjXyHjUcCI+jO61cJ+v1OPKLv2LWUMQgXZ/yg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kCkrcUek; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="kCkrcUek" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4B91FC433F1; Tue, 6 Feb 2024 15:12:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1707232366; bh=JC1iyaIU7mWHHBTGXNCiN27YHUuUtROsifUJHNlxJlc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kCkrcUekzwol6q7xY4KN9mdGIpvgQZ345e7elqG4p2/q3c1f678J6xUrOjXl8/cGa 0J9eUke7xFc7qnEO+0qOm5U7vUnfjW6Cs+0t1lUeGh+UEKyNjfV7/3XjsMy2tuWkut gjq8bm7XyzBfwfjnOJOwdruv/g+i6gDAZR0YFT04LhhnlmT6LSqdwJkOCH/cu9ctXE 209VEndnyrX5qyPrPiZv/S9s7eI9m4yObjI2CwKrSzdoiou1PutWHSpXWu/P6q9fg1 8irylQvdCKrlcRr5Yy21UQEjq+6D9j8rV4WLzDUVfLiEdNWcQFhqlsZ9SRlCVWxhNN 5oJyhhvkrosvA== 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: [PATCH v7 28/36] tracing: Add ftrace_partial_regs() for converting ftrace_regs to pt_regs Date: Wed, 7 Feb 2024 00:12:40 +0900 Message-Id: <170723236068.502590.9568421023325291255.stgit@devnote2> X-Mailer: git-send-email 2.34.1 In-Reply-To: <170723204881.502590.11906735097521170661.stgit@devnote2> References: <170723204881.502590.11906735097521170661.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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/ftrace.h index efd5dbf74dd6..31051fa2b4d9 100644 --- a/arch/arm64/include/asm/ftrace.h +++ b/arch/arm64/include/asm/ftrace.h @@ -143,6 +143,17 @@ ftrace_override_function_with_return(struct ftrace_regs *fregs) fregs->pc = fregs->lr; } +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 = fregs->sp; + regs->pc = fregs->pc; + regs->regs[29] = fregs->fp; + regs->regs[30] = fregs->lr; + return regs; +} + int ftrace_regs_query_register_offset(const char *name); int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index a72a2eaec576..515ec804d605 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -173,6 +173,23 @@ static __always_inline struct pt_regs *ftrace_get_regs(struct ftrace_regs *fregs return arch_ftrace_get_regs(fregs); } +#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=y, 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.