From ec4bb8e8dfa060c699b548f62e4d56133aafbbec Mon Sep 17 00:00:00 2001
From: Benjamin Berg <benjamin.berg@intel.com>
Date: Wed, 24 Sep 2025 16:20:58 +0200
Subject: tools/nolibc: add ptrace support
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Add ptrace support, as it will be useful in UML.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
[Thomas: drop va_args usage and linux/uio.h inclusion]
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
---
 tools/include/nolibc/Makefile     |  1 +
 tools/include/nolibc/nolibc.h     |  1 +
 tools/include/nolibc/sys/ptrace.h | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 35 insertions(+)
 create mode 100644 tools/include/nolibc/sys/ptrace.h

(limited to 'tools/include')

diff --git a/tools/include/nolibc/Makefile b/tools/include/nolibc/Makefile
index 8118e22844f1..8b883a6fe580 100644
--- a/tools/include/nolibc/Makefile
+++ b/tools/include/nolibc/Makefile
@@ -54,6 +54,7 @@ all_files := \
 		sys/mman.h \
 		sys/mount.h \
 		sys/prctl.h \
+		sys/ptrace.h \
 		sys/random.h \
 		sys/reboot.h \
 		sys/resource.h \
diff --git a/tools/include/nolibc/nolibc.h b/tools/include/nolibc/nolibc.h
index 272dfc961158..9c7f43b9218b 100644
--- a/tools/include/nolibc/nolibc.h
+++ b/tools/include/nolibc/nolibc.h
@@ -101,6 +101,7 @@
 #include "sys/mman.h"
 #include "sys/mount.h"
 #include "sys/prctl.h"
+#include "sys/ptrace.h"
 #include "sys/random.h"
 #include "sys/reboot.h"
 #include "sys/resource.h"
diff --git a/tools/include/nolibc/sys/ptrace.h b/tools/include/nolibc/sys/ptrace.h
new file mode 100644
index 000000000000..72ca28541633
--- /dev/null
+++ b/tools/include/nolibc/sys/ptrace.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * ptrace for NOLIBC
+ * Copyright (C) 2017-2021 Willy Tarreau <w@1wt.eu>
+ * Copyright (C) 2025 Intel Corporation
+ */
+
+/* make sure to include all global symbols */
+#include "../nolibc.h"
+
+#ifndef _NOLIBC_SYS_PTRACE_H
+#define _NOLIBC_SYS_PTRACE_H
+
+#include "../sys.h"
+
+#include <linux/ptrace.h>
+
+/*
+ * long ptrace(int op, pid_t pid, void *addr, void *data);
+ */
+static __attribute__((unused))
+long sys_ptrace(int op, pid_t pid, void *addr, void *data)
+{
+	return my_syscall4(__NR_ptrace, op, pid, addr, data);
+}
+
+static __attribute__((unused))
+ssize_t ptrace(int op, pid_t pid, void *addr, void *data)
+{
+	return __sysret(sys_ptrace(op, pid, addr, data));
+}
+
+#endif /* _NOLIBC_SYS_PTRACE_H */
-- 
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