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 static long ___se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__)) 41 42 #define SC_RISCV_REGS_TO_ARGS(x, ...) \ 43 regs->orig_a0,regs->a1,regs->a2,regs->a3,regs->a4,regs->a5,regs->a6 44 45 #endif /* CONFIG_64BIT */ 46 47 #ifdef CONFIG_COMPAT 48 49 #define COMPAT_SYSCALL_DEFINEx(x, name, ...) \ 50 asmlinkage long __riscv_compat_sys##name(const struct pt_regs *regs); \ 51 ALLOW_ERROR_INJECTION(__riscv_compat_sys##name, ERRNO); \ 52 static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)); \ 53 __SYSCALL_SE_DEFINEx(x, compat_sys, name, __VA_ARGS__) \ 54 { \ 55 return __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__)); \ 56 } \ 57 asmlinkage long __riscv_compat_sys##name(const struct pt_regs *regs) \ 58 { \ 59 return __se_compat_sys##name(SC_RISCV_REGS_TO_ARGS(x,__VA_ARGS__)); \ 60 } \ 61 static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) 62 63 #define COMPAT_SYSCALL_DEFINE0(sname) \ 64 asmlinkage long __riscv_compat_sys_##sname(const struct pt_regs *__unused); \ 65 ALLOW_ERROR_INJECTION(__riscv_compat_sys_##sname, ERRNO); \ 66 asmlinkage long __riscv_compat_sys_##sname(const struct pt_regs *__unused) 67 68 #define COND_SYSCALL_COMPAT(name) \ 69 asmlinkage long __weak __riscv_compat_sys_##name(const struct pt_regs *regs); \ 70 asmlinkage long __weak __riscv_compat_sys_##name(const struct pt_regs *regs) \ 71 { \ 72 return sys_ni_syscall(); \ 73 } 74 75 #endif /* CONFIG_COMPAT */ 76 77 #define __SYSCALL_DEFINEx(x, name, ...) \ 78 asmlinkage long __riscv_sys##name(const struct pt_regs *regs); \ 79 ALLOW_ERROR_INJECTION(__riscv_sys##name, ERRNO); \ 80 static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)); \ 81 __SYSCALL_SE_DEFINEx(x, sys, name, __VA_ARGS__) \ 82 { \ 83 long ret = __do_sys##name(__MAP(x,__SC_CAST,__VA_ARGS__)); \ 84 __MAP(x,__SC_TEST,__VA_ARGS__); \ 85 __PROTECT(x, ret,__MAP(x,__SC_ARGS,__VA_ARGS__)); \ 86 return ret; \ 87 } \ 88 asmlinkage long __riscv_sys##name(const struct pt_regs *regs) \ 89 { \ 90 return __se_sys##name(SC_RISCV_REGS_TO_ARGS(x,__VA_ARGS__)); \ 91 } \ 92 static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) 93 94 #define SYSCALL_DEFINE0(sname) \ 95 SYSCALL_METADATA(_##sname, 0); \ 96 asmlinkage long __riscv_sys_##sname(const struct pt_regs *__unused); \ 97 ALLOW_ERROR_INJECTION(__riscv_sys_##sname, ERRNO); \ 98 asmlinkage long __riscv_sys_##sname(const struct pt_regs *__unused) 99 100 #define COND_SYSCALL(name) \ 101 asmlinkage long __weak __riscv_sys_##name(const struct pt_regs *regs); \ 102 asmlinkage long __weak __riscv_sys_##name(const struct pt_regs *regs) \ 103 { \ 104 return sys_ni_syscall(); \ 105 } 106 107 #endif /* __ASM_SYSCALL_WRAPPER_H */ 108