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(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 */ 136