linux-kernel - [PATCH 7/7] man2: Add uretprobe syscall page

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Message-ID: <20240421194206.1010934-8-jolsa@kernel.org>
Date: Sun, 21 Apr 2024 21:42:06 +0200
From: Jiri Olsa <jolsa@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>
Cc: linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	linux-api@...r.kernel.org,
	x86@...nel.org,
	bpf@...r.kernel.org,
	Song Liu <songliubraving@...com>,
	Yonghong Song <yhs@...com>,
	John Fastabend <john.fastabend@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Borislav Petkov (AMD)" <bp@...en8.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andy Lutomirski <luto@...nel.org>
Subject: [PATCH 7/7] man2: Add uretprobe syscall page

Adding man page for new uretprobe syscall.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 man2/uretprobe.2 | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 man2/uretprobe.2

diff --git a/man2/uretprobe.2 b/man2/uretprobe.2
new file mode 100644
index 000000000000..c0343a88bb57
--- /dev/null
+++ b/man2/uretprobe.2
@@ -0,0 +1,40 @@
+.\" Copyright (C) 2024, Jiri Olsa <jolsa@...nel.org>
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.TH uretprobe 2 (date) "Linux man-pages (unreleased)"
+.SH NAME
+uretprobe \- execute pending return uprobes
+.SH SYNOPSIS
+.nf
+.B int uretprobe(void)
+.fi
+.SH DESCRIPTION
+On x86_64 architecture the kernel is using uretprobe syscall to trigger
+uprobe return probe consumers instead of using standard breakpoint instruction.
+The reason is that it's much faster to do syscall than breakpoint trap
+on x86_64 architecture.
+
+The uretprobe syscall is not supposed to be called directly by user, it's allowed
+to be invoked only through user space trampoline provided by kernel.
+When called from outside of this trampoline, the calling process will receive
+.BR SIGILL .
+
+.SH RETURN VALUE
+.BR uretprobe()
+return value is specific for given architecture.
+
+.SH VERSIONS
+This syscall is not specified in POSIX,
+and details of its behavior vary across systems.
+.SH STANDARDS
+None.
+.SH NOTES
+.BR uretprobe()
+exists only to allow the invocation of return uprobe consumers.
+It should
+.B never
+be called directly.
+Details of the arguments (if any) passed to
+.BR uretprobe ()
+and the return value are specific for given architecture.
-- 
2.44.0