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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 78420C36006 for ; Tue, 17 Sep 2024 10:16:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Cruo3UwrUo75hscNZCWWdd2uvo49NZtOH0Zk5+78Un8=; b=Ffjt+m2ZqHNe4bJadZL8x1GMmY NjZvoR7NdzwTzgpj5O5cj1cUOBkKe37LkMYvcQesWbYorBT6tI4jdZlXsYwnjj4vsbVMFK99BVgwu vYJGv0r51d4UjRo/U9rtIXbYfKIp8zREB1eXn6PJGn/4j5b7B8S73ZjwGyPNg18ktXceeZm7N+5Nm 7HrYRUj2CAIwtHA5z7XDvXFa3pq16J900FtBQfNvEuY0ft6FCyiWgkrK/vEsWtFObYb8y5x7hOfd6 MEbQ8TTtG/EDMeE/ghD+CzX/bUOWalUU1WPjr7aCT4qFDQQIMOACqDAwJz9XP2r1Gb47qwVED6Skp olIT1Tsw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1sqVFh-00000005vBL-0baV; Tue, 17 Sep 2024 10:16:09 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1sqVEa-00000005v2L-350m for linux-arm-kernel@lists.infradead.org; Tue, 17 Sep 2024 10:15:02 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 74CC85C5AFD; Tue, 17 Sep 2024 10:14:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id ACB92C4CEC5; Tue, 17 Sep 2024 10:14:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726568099; bh=+YgselXGB2n7Utocil+BbkClg7VXcbVrdFZwYP7vL0w=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=DNfuLgMoDNgLE6AjUI9dUk5KyYXunWTX1B3p0KG9DF/YKjE3tFPCZpo+0AlF9G3AE GCyOLgAR99oIqXi4yYGxp0n4F5sJFngmwgjQ89H/oD2/QUdc9o78MxJo2KmFYRNzLW D6yNfA6gbDMHmcCQANNAwp+jbPirSKHbj2chKBGi8m2t8vaQWW99qb3H6CatIqtSJq iAFrL78yjkAS+adew9XIkEOBvlkuKPu1AikIhRfX2HiKvy32nfv7pwXBNhQX+6+i4i N7uUgxBuJHV7n6t9IVbduPNZT3nkbun74GBWQ77YbslwruQMhpOJAV9OTwhMZx4JIG CM5vJzazbG4WQ== Date: Tue, 17 Sep 2024 11:14:54 +0100 From: Will Deacon To: Steven Rostedt Cc: Catalin Marinas , linux-arm-kernel@lists.infradead.org, "Masami Hiramatsu (Google)" , Florent Revest , linux-trace-kernel@vger.kernel.org, LKML , Alexei Starovoitov , Jiri Olsa , Arnaldo Carvalho de Melo , Daniel Borkmann , Mark Rutland Subject: Re: [PATCH v14 08/19] tracing: Add ftrace_partial_regs() for converting ftrace_regs to pt_regs Message-ID: <20240917101454.GC27384@willie-the-truck> References: <172615368656.133222.2336770908714920670.stgit@devnote2> <172615377576.133222.5911358383330497277.stgit@devnote2> <20240915052204.3dff1f75@rorschach.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240915052204.3dff1f75@rorschach.local.home> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240917_031500_882133_0442EDDF X-CRM114-Status: GOOD ( 24.10 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sun, Sep 15, 2024 at 05:22:04AM -0400, Steven Rostedt wrote: > On Fri, 13 Sep 2024 00:09:35 +0900 > "Masami Hiramatsu (Google)" wrote: > > > From: Masami Hiramatsu (Google) > > > > Add ftrace_partial_regs() which converts the ftrace_regs to pt_regs. > > This is for the eBPF which needs this to keep the same pt_regs interface > > to access registers. > > Thus when replacing the pt_regs with ftrace_regs in fprobes (which is > > used by kprobe_multi eBPF event), this will be used. > > > > 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 in v14: > > - Add riscv change. > > Changes in v8: > > - Add the reason why this required in changelog. > > Changes from previous series: NOTHING, just forward ported. > > --- > > arch/arm64/include/asm/ftrace.h | 11 +++++++++++ > > arch/riscv/include/asm/ftrace.h | 12 ++++++++++++ > > include/linux/ftrace.h | 17 +++++++++++++++++ > > 3 files changed, 40 insertions(+) > > > > diff --git a/arch/arm64/include/asm/ftrace.h b/arch/arm64/include/asm/ftrace.h > > index dffaab3dd1f1..5cd587afab6d 100644 > > --- a/arch/arm64/include/asm/ftrace.h > > +++ b/arch/arm64/include/asm/ftrace.h > > @@ -132,6 +132,17 @@ ftrace_regs_get_frame_pointer(const struct ftrace_regs *fregs) > > return fregs->fp; > > } > > > > +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; > > +} Ah, I guess this is where we pick up the lr that was set in patch 5. Acked-by: Will Deacon Will