linux-kernel - [PATCH 04/10] tools/nolibc: move getauxval() to sys/auxv.h

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Message-Id: <20250416-nolibc-split-sys-v1-4-a069a3f1d145@linutronix.de>
Date: Wed, 16 Apr 2025 14:06:19 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Willy Tarreau <w@....eu>, 
 Thomas Weißschuh <linux@...ssschuh.net>
Cc: linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH 04/10] tools/nolibc: move getauxval() to sys/auxv.h

This is the location regular userspace expects the definition.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 tools/include/nolibc/Makefile   |  1 +
 tools/include/nolibc/nolibc.h   |  1 +
 tools/include/nolibc/stdlib.h   | 26 --------------------------
 tools/include/nolibc/sys/auxv.h | 41 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 43 insertions(+), 26 deletions(-)

diff --git a/tools/include/nolibc/Makefile b/tools/include/nolibc/Makefile
index 2132e4f4d2165729ec6d10860d0586f1b71ee0fb..a3781f39692532fb75c7aaf70f65b2d5bf7c7abd 100644
--- a/tools/include/nolibc/Makefile
+++ b/tools/include/nolibc/Makefile
@@ -44,6 +44,7 @@ all_files := \
 		stdlib.h \
 		string.h \
 		sys.h \
+		sys/auxv.h \
 		time.h \
 		types.h \
 		unistd.h \
diff --git a/tools/include/nolibc/nolibc.h b/tools/include/nolibc/nolibc.h
index bb4183a8fdc41023d9b8b37fe35ec37ca408b4c6..0d8c49e0dddc595c2f029788ecb5b51231e2695a 100644
--- a/tools/include/nolibc/nolibc.h
+++ b/tools/include/nolibc/nolibc.h
@@ -96,6 +96,7 @@
 #include "arch.h"
 #include "types.h"
 #include "sys.h"
+#include "sys/auxv.h"
 #include "ctype.h"
 #include "elf.h"
 #include "signal.h"
diff --git a/tools/include/nolibc/stdlib.h b/tools/include/nolibc/stdlib.h
index 86ad378ab1ea220559d5ab1adc4bb9972977ba9e..ba8a1427121fc543fc83646e5108c645cbdd62a2 100644
--- a/tools/include/nolibc/stdlib.h
+++ b/tools/include/nolibc/stdlib.h
@@ -102,32 +102,6 @@ char *getenv(const char *name)
 	return NULL;
 }
 
-static __attribute__((unused))
-unsigned long getauxval(unsigned long type)
-{
-	const unsigned long *auxv = _auxv;
-	unsigned long ret;
-
-	if (!auxv)
-		return 0;
-
-	while (1) {
-		if (!auxv[0] && !auxv[1]) {
-			ret = 0;
-			break;
-		}
-
-		if (auxv[0] == type) {
-			ret = auxv[1];
-			break;
-		}
-
-		auxv += 2;
-	}
-
-	return ret;
-}
-
 static __attribute__((unused))
 void *malloc(size_t len)
 {
diff --git a/tools/include/nolibc/sys/auxv.h b/tools/include/nolibc/sys/auxv.h
new file mode 100644
index 0000000000000000000000000000000000000000..04c2b9cbe51a262025bbbc7c74a0640c71529eab
--- /dev/null
+++ b/tools/include/nolibc/sys/auxv.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * auxv definitions for NOLIBC
+ * Copyright (C) 2017-2021 Willy Tarreau <w@....eu>
+ */
+
+#ifndef _NOLIBC_SYS_AUXV_H
+#define _NOLIBC_SYS_AUXV_H
+
+#include "../crt.h"
+
+static __attribute__((unused))
+unsigned long getauxval(unsigned long type)
+{
+	const unsigned long *auxv = _auxv;
+	unsigned long ret;
+
+	if (!auxv)
+		return 0;
+
+	while (1) {
+		if (!auxv[0] && !auxv[1]) {
+			ret = 0;
+			break;
+		}
+
+		if (auxv[0] == type) {
+			ret = auxv[1];
+			break;
+		}
+
+		auxv += 2;
+	}
+
+	return ret;
+}
+
+/* make sure to include all global symbols */
+#include "../nolibc.h"
+
+#endif /* _NOLIBC_SYS_AUXV_H */

-- 
2.49.0