1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * syscall_wrapper.h - riscv specific wrappers to syscall definitions
4 *
5 * Based on arch/arm64/include/syscall_wrapper.h
6 */
7
8 #ifndef __ASM_SYSCALL_WRAPPER_H
9 #define __ASM_SYSCALL_WRAPPER_H
10
11 #include <asm/ptrace.h>
12
13 asmlinkage long __riscv_sys_ni_syscall(const struct pt_regs *);
14
15 #ifdef CONFIG_64BIT
16
17 #define __SYSCALL_SE_DEFINEx(x, prefix, name, ...) \
18 static long __se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__)); \
19 static long __se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__))
20
21 #define SC_RISCV_REGS_TO_ARGS(x, ...) \
22 __MAP(x,__SC_ARGS \
23 ,,regs->orig_a0,,regs->a1,,regs->a2 \
24 ,,regs->a3,,regs->a4,,regs->a5,,regs->a6)
25
26 #else
27 /*
28 * Use type aliasing to ensure registers a0-a6 are correctly passed to the syscall
29 * implementation when >word-size arguments are used.
30 */
31 #define __SYSCALL_SE_DEFINEx(x, prefix, name, ...) \
32 __diag_push(); \
33 __diag_ignore(GCC, 8, "-Wattribute-alias", \
34 "Type aliasing is used to sanitize syscall arguments"); \
35 static long __se_##prefix##name(ulong, ulong, ulong, ulong, ulong, ulong, \
36 ulong) \
37 __attribute__((alias(__stringify(___se_##prefix##name)))); \
38 __diag_pop(); \
39 static long noinline ___se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
40 __used; \
41 static long ___se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__))
42
43 #define SC_RISCV_REGS_TO_ARGS(x, ...) \
44 regs->orig_a0,regs->a1,regs->a2,regs->a3,regs->a4,regs->a5,regs->a6
45
46 #endif /* CONFIG_64BIT */
47
48 #ifdef CONFIG_COMPAT
49
50 #define COMPAT_SYSCALL_DEFINEx(x, name, ...) \
51 asmlinkage long __riscv_compat_sys##name(const struct pt_regs *regs); \
52 ALLOW_ERROR_INJECTION(__riscv_compat_sys##name, ERRNO); \
53 static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)); \
54 __SYSCALL_SE_DEFINEx(x, compat_sys, name, __VA_ARGS__) \
55 { \
56 return __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__)); \
57 } \
58 asmlinkage long __riscv_compat_sys##name(const struct pt_regs *regs) \
59 { \
60 return __se_compat_sys##name(SC_RISCV_REGS_TO_ARGS(x,__VA_ARGS__)); \
61 } \
62 static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
63
64 #define COMPAT_SYSCALL_DEFINE0(sname) \
65 asmlinkage long __riscv_compat_sys_##sname(const struct pt_regs *__unused); \
66 ALLOW_ERROR_INJECTION(__riscv_compat_sys_##sname, ERRNO); \
67 asmlinkage long __riscv_compat_sys_##sname(const struct pt_regs *__unused)
68
69 #define COND_SYSCALL_COMPAT(name) \
70 asmlinkage long __weak __riscv_compat_sys_##name(const struct pt_regs *regs); \
71 asmlinkage long __weak __riscv_compat_sys_##name(const struct pt_regs *regs) \
72 { \
73 return sys_ni_syscall(); \
74 }
75
76 #endif /* CONFIG_COMPAT */
77
78 #define __SYSCALL_DEFINEx(x, name, ...) \
79 asmlinkage long __riscv_sys##name(const struct pt_regs *regs); \
80 ALLOW_ERROR_INJECTION(__riscv_sys##name, ERRNO); \
81 static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)); \
82 __SYSCALL_SE_DEFINEx(x, sys, name, __VA_ARGS__) \
83 { \
84 long ret = __do_sys##name(__MAP(x,__SC_CAST,__VA_ARGS__)); \
85 __MAP(x,__SC_TEST,__VA_ARGS__); \
86 __PROTECT(x, ret,__MAP(x,__SC_ARGS,__VA_ARGS__)); \
87 return ret; \
88 } \
89 asmlinkage long __riscv_sys##name(const struct pt_regs *regs) \
90 { \
91 return __se_sys##name(SC_RISCV_REGS_TO_ARGS(x,__VA_ARGS__)); \
92 } \
93 static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
94
95 #define SYSCALL_DEFINE0(sname) \
96 SYSCALL_METADATA(_##sname, 0); \
97 asmlinkage long __riscv_sys_##sname(const struct pt_regs *__unused); \
98 ALLOW_ERROR_INJECTION(__riscv_sys_##sname, ERRNO); \
99 asmlinkage long __riscv_sys_##sname(const struct pt_regs *__unused)
100
101 #define COND_SYSCALL(name) \
102 asmlinkage long __weak __riscv_sys_##name(const struct pt_regs *regs); \
103 asmlinkage long __weak __riscv_sys_##name(const struct pt_regs *regs) \
104 { \
105 return sys_ni_syscall(); \
106 }
107
108 #endif /* __ASM_SYSCALL_WRAPPER_H */
109
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