This is used in various selftests and will be handy when integrating
those with nolibc.
Signed-off-by: Thomas Weißschuh <thomas.weisssc...@linutronix.de>
---
tools/include/nolibc/Makefile | 1 +
tools/include/nolibc/math.h | 31 ++++++++++++++++++++++++++++
tools/include/nolibc/nolibc.h | 1 +
tools/include/nolibc/stdlib.h | 18 ++++++++++++++++
tools/testing/selftests/nolibc/nolibc-test.c | 2 ++
5 files changed, 53 insertions(+)
diff --git a/tools/include/nolibc/Makefile b/tools/include/nolibc/Makefile
index
b22ff1e268b2e4bd788e974d6d8f2e1ef96dfc5f..3a82e036a2c1762da5c3916ff9f4e158fb6106ff
100644
--- a/tools/include/nolibc/Makefile
+++ b/tools/include/nolibc/Makefile
@@ -35,6 +35,7 @@ all_files := \
fcntl.h \
getopt.h \
limits.h \
+ math.h \
nolibc.h \
signal.h \
stackprotector.h \
diff --git a/tools/include/nolibc/math.h b/tools/include/nolibc/math.h
new file mode 100644
index
0000000000000000000000000000000000000000..4906d3eb7c1aed0c402d3ab39526dd1c93b5df2a
--- /dev/null
+++ b/tools/include/nolibc/math.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * math definitions for NOLIBC
+ * Copyright (C) 2025 Thomas Weißschuh <thomas.weisssc...@linutronix.de>
+ */
+
+#ifndef _NOLIBC_SYS_MATH_H
+#define _NOLIBC_SYS_MATH_H
+
+static __inline__
+double fabs(double x)
+{
+ return x >= 0 ? x : -x;
+}
+
+static __inline__
+float fabsf(float x)
+{
+ return x >= 0 ? x : -x;
+}
+
+static __inline__
+long double fabsl(long double x)
+{
+ return x >= 0 ? x : -x;
+}
+
+/* make sure to include all global symbols */
+#include "nolibc.h"
+
+#endif /* _NOLIBC_SYS_MATH_H */
diff --git a/tools/include/nolibc/nolibc.h b/tools/include/nolibc/nolibc.h
index
3f329feb379c4c808d2e56fbb2b7a6c4b08a7c0d..2207f3d3c5cf92b96150149050f0bde0ed7e7147
100644
--- a/tools/include/nolibc/nolibc.h
+++ b/tools/include/nolibc/nolibc.h
@@ -115,6 +115,7 @@
#include "dirent.h"
#include "fcntl.h"
#include "getopt.h"
+#include "math.h"
/* Used by programs to avoid std includes */
#define NOLIBC
diff --git a/tools/include/nolibc/stdlib.h b/tools/include/nolibc/stdlib.h
index
69cf1d4418f1c1f59192aee40ea3a5b684d2709a..c8c44859aee20e2b9eb55ddae488f1f70b710fbb
100644
--- a/tools/include/nolibc/stdlib.h
+++ b/tools/include/nolibc/stdlib.h
@@ -29,6 +29,24 @@ static __attribute__((unused)) char itoa_buffer[21];
* As much as possible, please keep functions alphabetically sorted.
*/
+static __inline__
+int abs(int j)
+{
+ return j >= 0 ? j : -j;
+}
+
+static __inline__
+long labs(long j)
+{
+ return j >= 0 ? j : -j;
+}
+
+static __inline__
+long long llabs(long long j)
+{
+ return j >= 0 ? j : -j;
+}
+
/* must be exported, as it's used by libgcc for various divide functions */
void abort(void);
__attribute__((weak,unused,noreturn,section(".text.nolibc_abort")))
diff --git a/tools/testing/selftests/nolibc/nolibc-test.c
b/tools/testing/selftests/nolibc/nolibc-test.c
index
95d08e9ccf5b3be924548100e9621cd47f39e8c2..b6724c314766b0cf34d7cae5cac28a9102ebe66e
100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -1315,6 +1315,8 @@ int run_stdlib(int min, int max)
CASE_TEST(tolower_noop); EXPECT_EQ(1, tolower('a'),
'a'); break;
CASE_TEST(toupper); EXPECT_EQ(1, toupper('a'),
'A'); break;
CASE_TEST(toupper_noop); EXPECT_EQ(1, toupper('A'),
'A'); break;
+ CASE_TEST(abs); EXPECT_EQ(1, abs(-10), 10);
break;
+ CASE_TEST(abs_noop); EXPECT_EQ(1, abs(10), 10);
break;
case __LINE__:
return ret; /* must be last */
--
2.49.0
