From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 11 Apr 2024 10:27:49 +0200
Subject: Adding upstream version 6.6.15.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 arch/s390/include/asm/syscall_wrapper.h | 140 ++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 arch/s390/include/asm/syscall_wrapper.h

(limited to 'arch/s390/include/asm/syscall_wrapper.h')

diff --git a/arch/s390/include/asm/syscall_wrapper.h b/arch/s390/include/asm/syscall_wrapper.h
new file mode 100644
index 0000000000..35c1d1b860
--- /dev/null
+++ b/arch/s390/include/asm/syscall_wrapper.h
@@ -0,0 +1,140 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * syscall_wrapper.h - s390 specific wrappers to syscall definitions
+ *
+ */
+
+#ifndef _ASM_S390_SYSCALL_WRAPPER_H
+#define _ASM_S390_SYSCALL_WRAPPER_H
+
+/* Mapping of registers to parameters for syscalls */
+#define SC_S390_REGS_TO_ARGS(x, ...)					\
+	__MAP(x, __SC_ARGS						\
+	      ,, regs->orig_gpr2,, regs->gprs[3],, regs->gprs[4]	\
+	      ,, regs->gprs[5],, regs->gprs[6],, regs->gprs[7])
+
+#ifdef CONFIG_COMPAT
+
+#define __SC_COMPAT_CAST(t, a)						\
+({									\
+	long __ReS = a;							\
+									\
+	BUILD_BUG_ON((sizeof(t) > 4) && !__TYPE_IS_L(t) &&		\
+		     !__TYPE_IS_UL(t) && !__TYPE_IS_PTR(t) &&		\
+		     !__TYPE_IS_LL(t));					\
+	if (__TYPE_IS_L(t))						\
+		__ReS = (s32)a;						\
+	if (__TYPE_IS_UL(t))						\
+		__ReS = (u32)a;						\
+	if (__TYPE_IS_PTR(t))						\
+		__ReS = a & 0x7fffffff;					\
+	if (__TYPE_IS_LL(t))						\
+		return -ENOSYS;						\
+	(t)__ReS;							\
+})
+
+/*
+ * To keep the naming coherent, re-define SYSCALL_DEFINE0 to create an alias
+ * named __s390x_sys_*()
+ */
+#define COMPAT_SYSCALL_DEFINE0(sname)					\
+	long __s390_compat_sys_##sname(void);				\
+	ALLOW_ERROR_INJECTION(__s390_compat_sys_##sname, ERRNO);	\
+	long __s390_compat_sys_##sname(void)
+
+#define SYSCALL_DEFINE0(sname)						\
+	SYSCALL_METADATA(_##sname, 0);					\
+	long __s390_sys_##sname(void);					\
+	ALLOW_ERROR_INJECTION(__s390_sys_##sname, ERRNO);		\
+	long __s390x_sys_##sname(void);					\
+	ALLOW_ERROR_INJECTION(__s390x_sys_##sname, ERRNO);		\
+	static inline long __do_sys_##sname(void);			\
+	long __s390_sys_##sname(void)					\
+	{								\
+		return __do_sys_##sname();				\
+	}								\
+	long __s390x_sys_##sname(void)					\
+	{								\
+		return __do_sys_##sname();				\
+	}								\
+	static inline long __do_sys_##sname(void)
+
+#define COND_SYSCALL(name)						\
+	cond_syscall(__s390x_sys_##name);				\
+	cond_syscall(__s390_sys_##name)
+
+#define COMPAT_SYSCALL_DEFINEx(x, name, ...)						\
+	long __s390_compat_sys##name(struct pt_regs *regs);				\
+	ALLOW_ERROR_INJECTION(__s390_compat_sys##name, ERRNO);				\
+	static inline long __se_compat_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__));	\
+	static inline long __do_compat_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__));	\
+	long __s390_compat_sys##name(struct pt_regs *regs)				\
+	{										\
+		return __se_compat_sys##name(SC_S390_REGS_TO_ARGS(x, __VA_ARGS__));	\
+	}										\
+	static inline long __se_compat_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__))	\
+	{										\
+		__MAP(x, __SC_TEST, __VA_ARGS__);					\
+		return __do_compat_sys##name(__MAP(x, __SC_DELOUSE, __VA_ARGS__));	\
+	}										\
+	static inline long __do_compat_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__))
+
+/*
+ * As some compat syscalls may not be implemented, we need to expand
+ * COND_SYSCALL_COMPAT in kernel/sys_ni.c to cover this case as well.
+ */
+#define COND_SYSCALL_COMPAT(name)					\
+	cond_syscall(__s390_compat_sys_##name)
+
+#define __S390_SYS_STUBx(x, name, ...)						\
+	long __s390_sys##name(struct pt_regs *regs);				\
+	ALLOW_ERROR_INJECTION(__s390_sys##name, ERRNO);				\
+	static inline long ___se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__));	\
+	long __s390_sys##name(struct pt_regs *regs)				\
+	{									\
+		return ___se_sys##name(SC_S390_REGS_TO_ARGS(x, __VA_ARGS__));	\
+	}									\
+	static inline long ___se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__))	\
+	{									\
+		__MAP(x, __SC_TEST, __VA_ARGS__);				\
+		return __do_sys##name(__MAP(x, __SC_COMPAT_CAST, __VA_ARGS__));	\
+	}
+
+#else /* CONFIG_COMPAT */
+
+#define SYSCALL_DEFINE0(sname)						\
+	SYSCALL_METADATA(_##sname, 0);					\
+	long __s390x_sys_##sname(void);					\
+	ALLOW_ERROR_INJECTION(__s390x_sys_##sname, ERRNO);		\
+	static inline long __do_sys_##sname(void);			\
+	long __s390x_sys_##sname(void)					\
+	{								\
+		return __do_sys_##sname();				\
+	}								\
+	static inline long __do_sys_##sname(void)
+
+#define COND_SYSCALL(name)						\
+	cond_syscall(__s390x_sys_##name)
+
+#define __S390_SYS_STUBx(x, fullname, name, ...)
+
+#endif /* CONFIG_COMPAT */
+
+#define __SYSCALL_DEFINEx(x, name, ...)						\
+	long __s390x_sys##name(struct pt_regs *regs);				\
+	ALLOW_ERROR_INJECTION(__s390x_sys##name, ERRNO);			\
+	static inline long __se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__));	\
+	static inline long __do_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__));	\
+	__S390_SYS_STUBx(x, name, __VA_ARGS__);					\
+	long __s390x_sys##name(struct pt_regs *regs)				\
+	{									\
+		return __se_sys##name(SC_S390_REGS_TO_ARGS(x, __VA_ARGS__));	\
+	}									\
+	static inline long __se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__))	\
+	{									\
+		__MAP(x, __SC_TEST, __VA_ARGS__);				\
+		return __do_sys##name(__MAP(x, __SC_CAST, __VA_ARGS__));	\
+	}									\
+	static inline long __do_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__))
+
+#endif /* _ASM_S390_SYSCALL_WRAPPER_H */
-- 
cgit v1.2.3