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
13asmlinkage 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