From mboxrd@z Thu Jan 1 00:00:00 1970 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 E0EC11CCAF for ; Sat, 12 Aug 2023 05:36:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 337D9C433C8; Sat, 12 Aug 2023 05:36:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1691818613; bh=blEGHkYpfxZ/1E7WBPNHsUXM+7p3REUp7I8zSsGXqWg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GrCcvdTy2YsEo6/vYNC3BwLrflolqioYyx+EYQOJp/1Pz/a5YY3sXMpalYrFs0R0j JUIQSw6pgmUv7Tfe9wyv74ePTOsgjbJ3zwxZV2V0HsR2T0KIDU+TKt4kyMg3cTp+X5 sgQY9Q3NR8p/0zQgnqUQ2qwfpMYUr4xvNEMNKfoliizh9wDQVmxeP/xLrtDBOiwR8v C8h96HzSoorF4DAxA+c4aPR2TZCDrAJ++rqFMe+xEY2Sb4pKSIXPsm1i1atzc2+VcK ie96vOscAPAGsPQPlipmD8M4ucicOAATf3OSw7n6GFcAI1LuilADu3ZHxycQ/at05l HJLuWZRu2LpQA== 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 Subject: [PATCH v3 1/8] Documentation: probes: Add a new ret_ip callback parameter Date: Sat, 12 Aug 2023 14:36:47 +0900 Message-Id: <169181860742.505132.14215380532909911090.stgit@devnote2> X-Mailer: git-send-email 2.34.1 In-Reply-To: <169181859570.505132.10136520092011157898.stgit@devnote2> References: <169181859570.505132.10136520092011157898.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 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Masami Hiramatsu (Google) Add a new ret_ip callback parameter description. Fixes: cb16330d1274 ("fprobe: Pass return address to the handlers") Signed-off-by: Masami Hiramatsu (Google) --- Documentation/trace/fprobe.rst | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/Documentation/trace/fprobe.rst b/Documentation/trace/fprobe.rst index 40dd2fbce861..a6d682478147 100644 --- a/Documentation/trace/fprobe.rst +++ b/Documentation/trace/fprobe.rst @@ -91,9 +91,9 @@ The prototype of the entry/exit callback function are as follows: .. code-block:: c - int entry_callback(struct fprobe *fp, unsigned long entry_ip, struct pt_regs *regs, void *entry_data); + int entry_callback(struct fprobe *fp, unsigned long entry_ip, unsigned long ret_ip, struct pt_regs *regs, void *entry_data); - void exit_callback(struct fprobe *fp, unsigned long entry_ip, struct pt_regs *regs, void *entry_data); + void exit_callback(struct fprobe *fp, unsigned long entry_ip, unsigned long ret_ip, struct pt_regs *regs, void *entry_data); Note that the @entry_ip is saved at function entry and passed to exit handler. If the entry callback function returns !0, the corresponding exit callback will be cancelled. @@ -108,6 +108,10 @@ If the entry callback function returns !0, the corresponding exit callback will Note that this may not be the actual entry address of the function but the address where the ftrace is instrumented. +@ret_ip + This is the return address of the traced function. This can be used + at both entry and exit. + @regs This is the `pt_regs` data structure at the entry and exit. Note that the instruction pointer of @regs may be different from the @entry_ip