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 __diag_ignore(clang, 23, "-Wunknown-warning-option", \ 36 "Avoid breaking versions without -Wattribute-alias"); \ 37 __diag_ignore(clang, 23, "-Wattribute-alias", \ 38 "Type aliasing is used to sanitize syscall arguments"); \ 39 static long __se_##prefix##name(ulong, ulong, ulong, ulong, ulong, ulong, \ 40 ulong) \ 41 __attribute__((alias(__stringify(___se_##prefix##name)))); \ 42 __diag_pop(); \ 43 static long noinline ___se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \ 44 __used; \ 45 static long ___se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__)) 46 47 #define SC_RISCV_REGS_TO_ARGS(x, ...) \ 48 regs->orig_a0,regs->a1,regs->a2,regs->a3,regs->a4,regs->a5,regs->a6 49 50 #endif /* CONFIG_64BIT */ 51 52 #ifdef CONFIG_COMPAT 53 54 #define COMPAT_SYSCALL_DEFINEx(x, name, ...) \ 55 asmlinkage long __riscv_compat_sys##name(const struct pt_regs *regs); \ 56 ALLOW_ERROR_INJECTION(__riscv_compat_sys##name, ERRNO); \ 57 static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)); \ 58 __SYSCALL_SE_DEFINEx(x, compat_sys, name, __VA_ARGS__) \ 59 { \ 60 return __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__)); \ 61 } \ 62 asmlinkage long __riscv_compat_sys##name(const struct pt_regs *regs) \ 63 { \ 64 return __se_compat_sys##name(SC_RISCV_REGS_TO_ARGS(x,__VA_ARGS__)); \ 65 } \ 66 static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) 67 68 #define COMPAT_SYSCALL_DEFINE0(sname) \ 69 asmlinkage long __riscv_compat_sys_##sname(const struct pt_regs *__unused); \ 70 ALLOW_ERROR_INJECTION(__riscv_compat_sys_##sname, ERRNO); \ 71 asmlinkage long __riscv_compat_sys_##sname(const struct pt_regs *__unused) 72 73 #define COND_SYSCALL_COMPAT(name) \ 74 asmlinkage long __weak __riscv_compat_sys_##name(const struct pt_regs *regs); \ 75 asmlinkage long __weak __riscv_compat_sys_##name(const struct pt_regs *regs) \ 76 { \ 77 return sys_ni_syscall(); \ 78 } 79 80 #endif /* CONFIG_COMPAT */ 81 82 #define __SYSCALL_DEFINEx(x, name, ...) \ 83 asmlinkage long __riscv_sys##name(const struct pt_regs *regs); \ 84 ALLOW_ERROR_INJECTION(__riscv_sys##name, ERRNO); \ 85 static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)); \ 86 __SYSCALL_SE_DEFINEx(x, sys, name, __VA_ARGS__) \ 87 { \ 88 long ret = __do_sys##name(__MAP(x,__SC_CAST,__VA_ARGS__)); \ 89 __MAP(x,__SC_TEST,__VA_ARGS__); \ 90 __PROTECT(x, ret,__MAP(x,__SC_ARGS,__VA_ARGS__)); \ 91 return ret; \ 92 } \ 93 asmlinkage long __riscv_sys##name(const struct pt_regs *regs) \ 94 { \ 95 return __se_sys##name(SC_RISCV_REGS_TO_ARGS(x,__VA_ARGS__)); \ 96 } \ 97 static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) 98 99 #define SYSCALL_DEFINE0(sname) \ 100 SYSCALL_METADATA(_##sname, 0); \ 101 asmlinkage long __riscv_sys_##sname(const struct pt_regs *__unused); \ 102 ALLOW_ERROR_INJECTION(__riscv_sys_##sname, ERRNO); \ 103 asmlinkage long __riscv_sys_##sname(const struct pt_regs *__unused) 104 105 #define COND_SYSCALL(name) \ 106 asmlinkage long __weak __riscv_sys_##name(const struct pt_regs *regs); \ 107 asmlinkage long __weak __riscv_sys_##name(const struct pt_regs *regs) \ 108 { \ 109 return sys_ni_syscall(); \ 110 } 111 112 #endif /* __ASM_SYSCALL_WRAPPER_H */ 113