/* SPDX-License-Identifier: GPL-2.0 *//* * syscall_wrapper.h - riscv specific wrappers to syscall definitions * * Based on arch/arm64/include/syscall_wrapper.h */ #ifndef __ASM_SYSCALL_WRAPPER_H#define __ASM_SYSCALL_WRAPPER_H #include <asm/ptrace.h> asmlinkage long __riscv_sys_ni_syscall(const struct pt_regs *); #ifdef CONFIG_64BIT #define __SYSCALL_SE_DEFINEx(x, prefix, name, ...)					\	static long __se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__));		\	static long __se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__)) #define SC_RISCV_REGS_TO_ARGS(x, ...)							\	__MAP(x,__SC_ARGS								\	      ,,regs->orig_a0,,regs->a1,,regs->a2					\	      ,,regs->a3,,regs->a4,,regs->a5,,regs->a6) #else/* * Use type aliasing to ensure registers a0-a6 are correctly passed to the syscall * implementation when >word-size arguments are used. */#define __SYSCALL_SE_DEFINEx(x, prefix, name, ...)					\	__diag_push();									\	__diag_ignore(GCC, 8, "-Wattribute-alias",					\			"Type aliasing is used to sanitize syscall arguments");		\	__diag_ignore(clang, 23, "-Wunknown-warning-option",				\		      "Avoid breaking versions without -Wattribute-alias");		\	__diag_ignore(clang, 23, "-Wattribute-alias",					\			"Type aliasing is used to sanitize syscall arguments");		\	static long __se_##prefix##name(ulong, ulong, ulong, ulong, ulong, ulong, 	\					ulong)						\			__attribute__((alias(__stringify(___se_##prefix##name))));	\	__diag_pop();									\	static long noinline ___se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__))	\			__used;								\	static long ___se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__)) #define SC_RISCV_REGS_TO_ARGS(x, ...) \	regs->orig_a0,regs->a1,regs->a2,regs->a3,regs->a4,regs->a5,regs->a6 #endif /* CONFIG_64BIT */ #ifdef CONFIG_COMPAT #define COMPAT_SYSCALL_DEFINEx(x, name, ...)						\	asmlinkage long __riscv_compat_sys##name(const struct pt_regs *regs);		\	ALLOW_ERROR_INJECTION(__riscv_compat_sys##name, ERRNO);				\	static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));	\	__SYSCALL_SE_DEFINEx(x, compat_sys, name, __VA_ARGS__)				\	{										\		return __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__));	\	}										\	asmlinkage long __riscv_compat_sys##name(const struct pt_regs *regs)		\	{										\		return __se_compat_sys##name(SC_RISCV_REGS_TO_ARGS(x,__VA_ARGS__));	\	}										\	static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) #define COMPAT_SYSCALL_DEFINE0(sname)							\	asmlinkage long __riscv_compat_sys_##sname(const struct pt_regs *__unused);	\	ALLOW_ERROR_INJECTION(__riscv_compat_sys_##sname, ERRNO);			\	asmlinkage long __riscv_compat_sys_##sname(const struct pt_regs *__unused) #define COND_SYSCALL_COMPAT(name) 							\	asmlinkage long __weak __riscv_compat_sys_##name(const struct pt_regs *regs);	\	asmlinkage long __weak __riscv_compat_sys_##name(const struct pt_regs *regs)	\	{										\		return sys_ni_syscall();						\	} #endif /* CONFIG_COMPAT */ #define __SYSCALL_DEFINEx(x, name, ...)						\	asmlinkage long __riscv_sys##name(const struct pt_regs *regs);		\	ALLOW_ERROR_INJECTION(__riscv_sys##name, ERRNO);			\	static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));	\	__SYSCALL_SE_DEFINEx(x, sys, name, __VA_ARGS__)				\	{									\		long ret = __do_sys##name(__MAP(x,__SC_CAST,__VA_ARGS__));	\		__MAP(x,__SC_TEST,__VA_ARGS__);					\		__PROTECT(x, ret,__MAP(x,__SC_ARGS,__VA_ARGS__));		\		return ret;							\	}									\	asmlinkage long __riscv_sys##name(const struct pt_regs *regs)		\	{									\		return __se_sys##name(SC_RISCV_REGS_TO_ARGS(x,__VA_ARGS__));	\	}									\	static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) #define SYSCALL_DEFINE0(sname)							\	SYSCALL_METADATA(_##sname, 0);						\	asmlinkage long __riscv_sys_##sname(const struct pt_regs *__unused);	\	ALLOW_ERROR_INJECTION(__riscv_sys_##sname, ERRNO);			\	asmlinkage long __riscv_sys_##sname(const struct pt_regs *__unused) #define COND_SYSCALL(name)							\	asmlinkage long __weak __riscv_sys_##name(const struct pt_regs *regs);	\	asmlinkage long __weak __riscv_sys_##name(const struct pt_regs *regs)	\	{									\		return sys_ni_syscall();					\	} #endif /* __ASM_SYSCALL_WRAPPER_H */