Linux kernel mirror (for testing)
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linux
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 SYS_NI(name) \
67 SYSCALL_ALIAS(__s390x_sys_##name, sys_ni_posix_timers); \
68 SYSCALL_ALIAS(__s390_sys_##name, sys_ni_posix_timers)
69
70#define COMPAT_SYSCALL_DEFINEx(x, name, ...) \
71 long __s390_compat_sys##name(struct pt_regs *regs); \
72 ALLOW_ERROR_INJECTION(__s390_compat_sys##name, ERRNO); \
73 static inline long __se_compat_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)); \
74 static inline long __do_compat_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__)); \
75 long __s390_compat_sys##name(struct pt_regs *regs) \
76 { \
77 return __se_compat_sys##name(SC_S390_REGS_TO_ARGS(x, __VA_ARGS__)); \
78 } \
79 static inline long __se_compat_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)) \
80 { \
81 __MAP(x, __SC_TEST, __VA_ARGS__); \
82 return __do_compat_sys##name(__MAP(x, __SC_DELOUSE, __VA_ARGS__)); \
83 } \
84 static inline long __do_compat_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__))
85
86/*
87 * As some compat syscalls may not be implemented, we need to expand
88 * COND_SYSCALL_COMPAT in kernel/sys_ni.c and COMPAT_SYS_NI in
89 * kernel/time/posix-stubs.c to cover this case as well.
90 */
91#define COND_SYSCALL_COMPAT(name) \
92 cond_syscall(__s390_compat_sys_##name)
93
94#define COMPAT_SYS_NI(name) \
95 SYSCALL_ALIAS(__s390_compat_sys_##name, sys_ni_posix_timers)
96
97#define __S390_SYS_STUBx(x, name, ...) \
98 long __s390_sys##name(struct pt_regs *regs); \
99 ALLOW_ERROR_INJECTION(__s390_sys##name, ERRNO); \
100 static inline long ___se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)); \
101 long __s390_sys##name(struct pt_regs *regs) \
102 { \
103 return ___se_sys##name(SC_S390_REGS_TO_ARGS(x, __VA_ARGS__)); \
104 } \
105 static inline long ___se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)) \
106 { \
107 __MAP(x, __SC_TEST, __VA_ARGS__); \
108 return __do_sys##name(__MAP(x, __SC_COMPAT_CAST, __VA_ARGS__)); \
109 }
110
111#else /* CONFIG_COMPAT */
112
113#define SYSCALL_DEFINE0(sname) \
114 SYSCALL_METADATA(_##sname, 0); \
115 long __s390x_sys_##sname(void); \
116 ALLOW_ERROR_INJECTION(__s390x_sys_##sname, ERRNO); \
117 static inline long __do_sys_##sname(void); \
118 long __s390x_sys_##sname(void) \
119 { \
120 return __do_sys_##sname(); \
121 } \
122 static inline long __do_sys_##sname(void)
123
124#define COND_SYSCALL(name) \
125 cond_syscall(__s390x_sys_##name)
126
127#define SYS_NI(name) \
128 SYSCALL_ALIAS(__s390x_sys_##name, sys_ni_posix_timers)
129
130#define __S390_SYS_STUBx(x, fullname, name, ...)
131
132#endif /* CONFIG_COMPAT */
133
134#define __SYSCALL_DEFINEx(x, name, ...) \
135 long __s390x_sys##name(struct pt_regs *regs); \
136 ALLOW_ERROR_INJECTION(__s390x_sys##name, ERRNO); \
137 static inline long __se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)); \
138 static inline long __do_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__)); \
139 __S390_SYS_STUBx(x, name, __VA_ARGS__); \
140 long __s390x_sys##name(struct pt_regs *regs) \
141 { \
142 return __se_sys##name(SC_S390_REGS_TO_ARGS(x, __VA_ARGS__)); \
143 } \
144 static inline long __se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)) \
145 { \
146 __MAP(x, __SC_TEST, __VA_ARGS__); \
147 return __do_sys##name(__MAP(x, __SC_CAST, __VA_ARGS__)); \
148 } \
149 static inline long __do_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__))
150
151#endif /* _ASM_S390_SYSCALL_WRAPPER_H */