tools/nolibc: move syscall() to sys/syscall.h

This is the location regular userspace expects the definition.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250416-nolibc-split-sys-v1-7-a069a3f1d145@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

tools/include/nolibc/Makefile

@@ -47,6 +47,7 @@ all_files := \
 		sys/auxv.h \
 		sys/mman.h \
 		sys/stat.h \
+		sys/syscall.h \
 		time.h \
 		types.h \
 		unistd.h \

tools/include/nolibc/nolibc.h

@@ -99,6 +99,7 @@
 #include "sys/auxv.h"
 #include "sys/mman.h"
 #include "sys/stat.h"
+#include "sys/syscall.h"
 #include "ctype.h"
 #include "elf.h"
 #include "signal.h"

tools/include/nolibc/sys/syscall.h

@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * syscall() definition for NOLIBC
+ * Copyright (C) 2024 Thomas Weißschuh <linux@weissschuh.net>
+ */
+
+#ifndef _NOLIBC_SYS_SYSCALL_H
+#define _NOLIBC_SYS_SYSCALL_H
+
+#define __syscall_narg(_0, _1, _2, _3, _4, _5, _6, N, ...) N
+#define _syscall_narg(...) __syscall_narg(__VA_ARGS__, 6, 5, 4, 3, 2, 1, 0)
+#define _syscall(N, ...) __sysret(my_syscall##N(__VA_ARGS__))
+#define _syscall_n(N, ...) _syscall(N, __VA_ARGS__)
+#define syscall(...) _syscall_n(_syscall_narg(__VA_ARGS__), ##__VA_ARGS__)
+
+/* make sure to include all global symbols */
+#include "../nolibc.h"
+
+#endif /* _NOLIBC_SYS_SYSCALL_H */

tools/include/nolibc/unistd.h

@@ -56,12 +56,6 @@ int tcsetpgrp(int fd, pid_t pid)
 	return ioctl(fd, TIOCSPGRP, &pid);
 }
 
-#define __syscall_narg(_0, _1, _2, _3, _4, _5, _6, N, ...) N
-#define _syscall_narg(...) __syscall_narg(__VA_ARGS__, 6, 5, 4, 3, 2, 1, 0)
-#define _syscall(N, ...) __sysret(my_syscall##N(__VA_ARGS__))
-#define _syscall_n(N, ...) _syscall(N, __VA_ARGS__)
-#define syscall(...) _syscall_n(_syscall_narg(__VA_ARGS__), ##__VA_ARGS__)
-
 /* make sure to include all global symbols */
 #include "nolibc.h"