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
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