arch/s390/include/asm/syscall_wrapper.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * syscall_wrapper.h - s390 specific wrappers to syscall definitions
   4  *
   5  */
   6
   7 #ifndef _ASM_S390_SYSCALL_WRAPPER_H
   8 #define _ASM_S390_SYSCALL_WRAPPER_H
   9
  10 #ifdef CONFIG_COMPAT
  11 #define __SC_COMPAT_TYPE(t, a) \
  12         __typeof(__builtin_choose_expr(sizeof(t) > 4, 0L, (t)0)) a
  13
  14 #define __SC_COMPAT_CAST(t, a)                                          \
  15 ({                                                                      \
  16         long __ReS = a;                                                 \
  17                                                                         \
  18         BUILD_BUG_ON((sizeof(t) > 4) && !__TYPE_IS_L(t) &&              \
  19                      !__TYPE_IS_UL(t) && !__TYPE_IS_PTR(t) &&           \
  20                      !__TYPE_IS_LL(t));                                 \
  21         if (__TYPE_IS_L(t))                                             \
  22                 __ReS = (s32)a;                                         \
  23         if (__TYPE_IS_UL(t))                                            \
  24                 __ReS = (u32)a;                                         \
  25         if (__TYPE_IS_PTR(t))                                           \
  26                 __ReS = a & 0x7fffffff;                                 \
  27         if (__TYPE_IS_LL(t))                                            \
  28                 return -ENOSYS;                                         \
  29         (t)__ReS;                                                       \
  30 })
  31
  32 #define __S390_SYS_STUBx(x, name, ...)                                  \
  33         asmlinkage long __s390_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));\
  34         ALLOW_ERROR_INJECTION(__s390_sys##name, ERRNO);                 \
  35         asmlinkage long __s390_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))\
  36         {                                                               \
  37                 long ret = __s390x_sys##name(__MAP(x,__SC_COMPAT_CAST,__VA_ARGS__));\
  38                 __MAP(x,__SC_TEST,__VA_ARGS__);                         \
  39                 return ret;                                             \
  40         }
  41
  42 /*
  43  * To keep the naming coherent, re-define SYSCALL_DEFINE0 to create an alias
  44  * named __s390x_sys_*()
  45  */
  46 #define COMPAT_SYSCALL_DEFINE0(sname)                                   \
  47         SYSCALL_METADATA(_##sname, 0);                                  \
  48         asmlinkage long __s390_compat_sys_##sname(void);                \
  49         ALLOW_ERROR_INJECTION(__s390_compat_sys_##sname, ERRNO);        \
  50         asmlinkage long __s390_compat_sys_##sname(void)
  51
  52 #define SYSCALL_DEFINE0(sname)                                          \
  53         SYSCALL_METADATA(_##sname, 0);                                  \
  54         asmlinkage long __s390x_sys_##sname(void);                      \
  55         ALLOW_ERROR_INJECTION(__s390x_sys_##sname, ERRNO);              \
  56         asmlinkage long __s390_sys_##sname(void)                        \
  57                 __attribute__((alias(__stringify(__s390x_sys_##sname)))); \
  58         asmlinkage long __s390x_sys_##sname(void)
  59
  60 #define COND_SYSCALL(name)                                              \
  61         cond_syscall(__s390x_sys_##name);                               \
  62         cond_syscall(__s390_sys_##name)
  63
  64 #define SYS_NI(name)                                                    \
  65         SYSCALL_ALIAS(__s390x_sys_##name, sys_ni_posix_timers);         \
  66         SYSCALL_ALIAS(__s390_sys_##name, sys_ni_posix_timers)
  67
  68 #define COMPAT_SYSCALL_DEFINEx(x, name, ...)                                    \
  69         __diag_push();                                                          \
  70         __diag_ignore(GCC, 8, "-Wattribute-alias",                              \
  71                       "Type aliasing is used to sanitize syscall arguments");\
  72         asmlinkage long __s390_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));        \
  73         asmlinkage long __s390_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
  74                 __attribute__((alias(__stringify(__se_compat_sys##name))));     \
  75         ALLOW_ERROR_INJECTION(__s390_compat_sys##name, ERRNO);                  \
  76         static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
  77         asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));  \
  78         asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))   \
  79         {                                                                       \
  80                 long ret = __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__));\
  81                 __MAP(x,__SC_TEST,__VA_ARGS__);                                 \
  82                 return ret;                                                     \
  83         }                                                                       \
  84         __diag_pop();                                                           \
  85         static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
  86
  87 /*
  88  * As some compat syscalls may not be implemented, we need to expand
  89  * COND_SYSCALL_COMPAT in kernel/sys_ni.c and COMPAT_SYS_NI in
  90  * kernel/time/posix-stubs.c to cover this case as well.
  91  */
  92 #define COND_SYSCALL_COMPAT(name)                                       \
  93         cond_syscall(__s390_compat_sys_##name)
  94
  95 #define COMPAT_SYS_NI(name)                                             \
  96         SYSCALL_ALIAS(__s390_compat_sys_##name, sys_ni_posix_timers)
  97
  98 #else /* CONFIG_COMPAT */
  99
 100 #define __S390_SYS_STUBx(x, fullname, name, ...)
 101
 102 #define SYSCALL_DEFINE0(sname)                                          \
 103         SYSCALL_METADATA(_##sname, 0);                                  \
 104         asmlinkage long __s390x_sys_##sname(void);                      \
 105         ALLOW_ERROR_INJECTION(__s390x_sys_##sname, ERRNO);              \
 106         asmlinkage long __s390x_sys_##sname(void)
 107
 108 #define COND_SYSCALL(name)                                              \
 109         cond_syscall(__s390x_sys_##name)
 110
 111 #define SYS_NI(name)                                                    \
 112         SYSCALL_ALIAS(__s390x_sys_##name, sys_ni_posix_timers);
 113
 114 #endif /* CONFIG_COMPAT */
 115
 116 #define __SYSCALL_DEFINEx(x, name, ...)                                         \
 117         __diag_push();                                                          \
 118         __diag_ignore(GCC, 8, "-Wattribute-alias",                              \
 119                       "Type aliasing is used to sanitize syscall arguments");\
 120         asmlinkage long __s390x_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))       \
 121                 __attribute__((alias(__stringify(__se_sys##name))));            \
 122         ALLOW_ERROR_INJECTION(__s390x_sys##name, ERRNO);                        \
 123         long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));                    \
 124         static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));      \
 125         __S390_SYS_STUBx(x, name, __VA_ARGS__)                                  \
 126         asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))          \
 127         {                                                                       \
 128                 long ret = __do_sys##name(__MAP(x,__SC_CAST,__VA_ARGS__));      \
 129                 __MAP(x,__SC_TEST,__VA_ARGS__);                                 \
 130                 return ret;                                                     \
 131         }                                                                       \
 132         __diag_pop();                                                           \
 133         static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
 134
 135 #endif /* _ASM_X86_SYSCALL_WRAPPER_H */