Orange Pi5 kernel

/* 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
 
#ifdef CONFIG_COMPAT
#define __SC_COMPAT_TYPE(t, a) \
<------>__typeof(__builtin_choose_expr(sizeof(t) > 4, 0L, (t)0)) a
 
#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;							\
})
 
#define __S390_SYS_STUBx(x, name, ...)					\
<------>asmlinkage long __s390_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));\
<------>ALLOW_ERROR_INJECTION(__s390_sys##name, ERRNO);			\
<------>asmlinkage long __s390_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))\
<------>{								\
<------><------>long ret = __s390x_sys##name(__MAP(x,__SC_COMPAT_CAST,__VA_ARGS__));\
<------><------>__MAP(x,__SC_TEST,__VA_ARGS__);				\
<------><------>return ret;						\
<------>}
 
/*
 * To keep the naming coherent, re-define SYSCALL_DEFINE0 to create an alias
 * named __s390x_sys_*()
 */
#define COMPAT_SYSCALL_DEFINE0(sname)					\
<------>SYSCALL_METADATA(_##sname, 0);					\
<------>asmlinkage long __s390_compat_sys_##sname(void);		\
<------>ALLOW_ERROR_INJECTION(__s390_compat_sys_##sname, ERRNO);	\
<------>asmlinkage long __s390_compat_sys_##sname(void)
 
#define SYSCALL_DEFINE0(sname)						\
<------>SYSCALL_METADATA(_##sname, 0);					\
<------>asmlinkage long __s390x_sys_##sname(void);			\
<------>ALLOW_ERROR_INJECTION(__s390x_sys_##sname, ERRNO);		\
<------>asmlinkage long __s390_sys_##sname(void)			\
<------><------>__attribute__((alias(__stringify(__s390x_sys_##sname)))); \
<------>asmlinkage long __s390x_sys_##sname(void)
 
#define COND_SYSCALL(name)						\
<------>cond_syscall(__s390x_sys_##name);				\
<------>cond_syscall(__s390_sys_##name)
 
#define SYS_NI(name)							\
<------>SYSCALL_ALIAS(__s390x_sys_##name, sys_ni_posix_timers);		\
<------>SYSCALL_ALIAS(__s390_sys_##name, sys_ni_posix_timers)
 
#define COMPAT_SYSCALL_DEFINEx(x, name, ...)					\
<------>__diag_push();								\
<------>__diag_ignore(GCC, 8, "-Wattribute-alias",				\
<------><------>      "Type aliasing is used to sanitize syscall arguments");\
<------>asmlinkage long __s390_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));	\
<------>asmlinkage long __s390_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))	\
<------><------>__attribute__((alias(__stringify(__se_compat_sys##name))));	\
<------>ALLOW_ERROR_INJECTION(__s390_compat_sys##name, ERRNO);			\
<------>static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
<------>asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));	\
<------>asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))	\
<------>{									\
<------><------>long ret = __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__));\
<------><------>__MAP(x,__SC_TEST,__VA_ARGS__);					\
<------><------>return ret;							\
<------>}									\
<------>__diag_pop();								\
<------>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 and COMPAT_SYS_NI in
 * kernel/time/posix-stubs.c to cover this case as well.
 */
#define COND_SYSCALL_COMPAT(name)					\
<------>cond_syscall(__s390_compat_sys_##name)
 
#define COMPAT_SYS_NI(name)						\
<------>SYSCALL_ALIAS(__s390_compat_sys_##name, sys_ni_posix_timers)
 
#else /* CONFIG_COMPAT */
 
#define __S390_SYS_STUBx(x, fullname, name, ...)
 
#define SYSCALL_DEFINE0(sname)						\
<------>SYSCALL_METADATA(_##sname, 0);					\
<------>asmlinkage long __s390x_sys_##sname(void);			\
<------>ALLOW_ERROR_INJECTION(__s390x_sys_##sname, ERRNO);		\
<------>asmlinkage long __s390x_sys_##sname(void)
 
#define COND_SYSCALL(name)						\
<------>cond_syscall(__s390x_sys_##name)
 
#define SYS_NI(name)							\
<------>SYSCALL_ALIAS(__s390x_sys_##name, sys_ni_posix_timers);
 
#endif /* CONFIG_COMPAT */
 
#define __SYSCALL_DEFINEx(x, name, ...)						\
<------>__diag_push();								\
<------>__diag_ignore(GCC, 8, "-Wattribute-alias",				\
<------><------>      "Type aliasing is used to sanitize syscall arguments");\
<------>asmlinkage long __s390x_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))	\
<------><------>__attribute__((alias(__stringify(__se_sys##name))));		\
<------>ALLOW_ERROR_INJECTION(__s390x_sys##name, ERRNO);			\
<------>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__)					\
<------>asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))		\
<------>{									\
<------><------>long ret = __do_sys##name(__MAP(x,__SC_CAST,__VA_ARGS__));	\
<------><------>__MAP(x,__SC_TEST,__VA_ARGS__);					\
<------><------>return ret;							\
<------>}									\
<------>__diag_pop();								\
<------>static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
 
#endif /* _ASM_X86_SYSCALL_WRAPPER_H */