arch/riscv/include/asm/syscall_wrapper.h

   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 */