1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * syscall_wrapper.h - s390 specific wrappers to syscall definitions
4 *
5 */
6
7#ifndef _ASM_S390_SYSCALL_WRAPPER_H
8#define _ASM_S390_SYSCALL_WRAPPER_H
9
10/* Mapping of registers to parameters for syscalls */
11#define SC_S390_REGS_TO_ARGS(x, ...)					\
12	__MAP(x, __SC_ARGS						\
13	      ,, regs->orig_gpr2,, regs->gprs[3],, regs->gprs[4]	\
14	      ,, regs->gprs[5],, regs->gprs[6],, regs->gprs[7])
15
16#ifdef CONFIG_COMPAT
17
18#define __SC_COMPAT_CAST(t, a)						\
19({									\
20	long __ReS = a;							\
21									\
22	BUILD_BUG_ON((sizeof(t) > 4) && !__TYPE_IS_L(t) &&		\
23		     !__TYPE_IS_UL(t) && !__TYPE_IS_PTR(t) &&		\
24		     !__TYPE_IS_LL(t));					\
25	if (__TYPE_IS_L(t))						\
26		__ReS = (s32)a;						\
27	if (__TYPE_IS_UL(t))						\
28		__ReS = (u32)a;						\
29	if (__TYPE_IS_PTR(t))						\
30		__ReS = a & 0x7fffffff;					\
31	if (__TYPE_IS_LL(t))						\
32		return -ENOSYS;						\
33	(t)__ReS;							\
34})
35
36/*
37 * To keep the naming coherent, re-define SYSCALL_DEFINE0 to create an alias
38 * named __s390x_sys_*()
39 */
40#define COMPAT_SYSCALL_DEFINE0(sname)					\
41	long __s390_compat_sys_##sname(void);				\
42	ALLOW_ERROR_INJECTION(__s390_compat_sys_##sname, ERRNO);	\
43	long __s390_compat_sys_##sname(void)
44
45#define SYSCALL_DEFINE0(sname)						\
46	SYSCALL_METADATA(_##sname, 0);					\
47	long __s390_sys_##sname(void);					\
48	ALLOW_ERROR_INJECTION(__s390_sys_##sname, ERRNO);		\
49	long __s390x_sys_##sname(void);					\
50	ALLOW_ERROR_INJECTION(__s390x_sys_##sname, ERRNO);		\
51	static inline long __do_sys_##sname(void);			\
52	long __s390_sys_##sname(void)					\
53	{								\
54		return __do_sys_##sname();				\
55	}								\
56	long __s390x_sys_##sname(void)					\
57	{								\
58		return __do_sys_##sname();				\
59	}								\
60	static inline long __do_sys_##sname(void)
61
62#define COND_SYSCALL(name)						\
63	cond_syscall(__s390x_sys_##name);				\
64	cond_syscall(__s390_sys_##name)
65
66#define COMPAT_SYSCALL_DEFINEx(x, name, ...)						\
67	long __s390_compat_sys##name(struct pt_regs *regs);				\
68	ALLOW_ERROR_INJECTION(__s390_compat_sys##name, ERRNO);				\
69	static inline long __se_compat_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__));	\
70	static inline long __do_compat_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__));	\
71	long __s390_compat_sys##name(struct pt_regs *regs)				\
72	{										\
73		return __se_compat_sys##name(SC_S390_REGS_TO_ARGS(x, __VA_ARGS__));	\
74	}										\
75	static inline long __se_compat_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__))	\
76	{										\
77		__MAP(x, __SC_TEST, __VA_ARGS__);					\
78		return __do_compat_sys##name(__MAP(x, __SC_DELOUSE, __VA_ARGS__));	\
79	}										\
80	static inline long __do_compat_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__))
81
82/*
83 * As some compat syscalls may not be implemented, we need to expand
84 * COND_SYSCALL_COMPAT in kernel/sys_ni.c to cover this case as well.
85 */
86#define COND_SYSCALL_COMPAT(name)					\
87	cond_syscall(__s390_compat_sys_##name)
88
89#define __S390_SYS_STUBx(x, name, ...)						\
90	long __s390_sys##name(struct pt_regs *regs);				\
91	ALLOW_ERROR_INJECTION(__s390_sys##name, ERRNO);				\
92	static inline long ___se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__));	\
93	long __s390_sys##name(struct pt_regs *regs)				\
94	{									\
95		return ___se_sys##name(SC_S390_REGS_TO_ARGS(x, __VA_ARGS__));	\
96	}									\
97	static inline long ___se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__))	\
98	{									\
99		__MAP(x, __SC_TEST, __VA_ARGS__);				\
100		return __do_sys##name(__MAP(x, __SC_COMPAT_CAST, __VA_ARGS__));	\
101	}
102
103#else /* CONFIG_COMPAT */
104
105#define SYSCALL_DEFINE0(sname)						\
106	SYSCALL_METADATA(_##sname, 0);					\
107	long __s390x_sys_##sname(void);					\
108	ALLOW_ERROR_INJECTION(__s390x_sys_##sname, ERRNO);		\
109	static inline long __do_sys_##sname(void);			\
110	long __s390x_sys_##sname(void)					\
111	{								\
112		return __do_sys_##sname();				\
113	}								\
114	static inline long __do_sys_##sname(void)
115
116#define COND_SYSCALL(name)						\
117	cond_syscall(__s390x_sys_##name)
118
119#define __S390_SYS_STUBx(x, fullname, name, ...)
120
121#endif /* CONFIG_COMPAT */
122
123#define __SYSCALL_DEFINEx(x, name, ...)						\
124	long __s390x_sys##name(struct pt_regs *regs);				\
125	ALLOW_ERROR_INJECTION(__s390x_sys##name, ERRNO);			\
126	static inline long __se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__));	\
127	static inline long __do_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__));	\
128	__S390_SYS_STUBx(x, name, __VA_ARGS__);					\
129	long __s390x_sys##name(struct pt_regs *regs)				\
130	{									\
131		return __se_sys##name(SC_S390_REGS_TO_ARGS(x, __VA_ARGS__));	\
132	}									\
133	static inline long __se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__))	\
134	{									\
135		__MAP(x, __SC_TEST, __VA_ARGS__);				\
136		return __do_sys##name(__MAP(x, __SC_CAST, __VA_ARGS__));	\
137	}									\
138	static inline long __do_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__))
139
140#endif /* _ASM_S390_SYSCALL_WRAPPER_H */
141