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 /* Mapping of registers to parameters for syscalls */ 11 #define SC_S390_REGS_TO_ARGS(x, ...) \ 12 __MAP(x, __SC_ARGS \ 13 ,, regs->orig_gpr2,, regs->gprs[3],, regs->gprs[4] \ 14 ,, regs->gprs[5],, regs->gprs[6],, regs->gprs[7]) 15 16 #ifdef CONFIG_COMPAT 17 18 #define __SC_COMPAT_CAST(t, a) \ 19 ({ \ 20 long __ReS = a; \ 21 \ 22 BUILD_BUG_ON((sizeof(t) > 4) && !__TYPE_IS_L(t) && \ 23 !__TYPE_IS_UL(t) && !__TYPE_IS_PTR(t) && \ 24 !__TYPE_IS_LL(t)); \ 25 if (__TYPE_IS_L(t)) \ 26 __ReS = (s32)a; \ 27 if (__TYPE_IS_UL(t)) \ 28 __ReS = (u32)a; \ 29 if (__TYPE_IS_PTR(t)) \ 30 __ReS = a & 0x7fffffff; \ 31 if (__TYPE_IS_LL(t)) \ 32 return -ENOSYS; \ 33 (t)__ReS; \ 34 }) 35 36 /* 37 * To keep the naming coherent, re-define SYSCALL_DEFINE0 to create an alias 38 * named __s390x_sys_*() 39 */ 40 #define COMPAT_SYSCALL_DEFINE0(sname) \ 41 long __s390_compat_sys_##sname(void); \ 42 ALLOW_ERROR_INJECTION(__s390_compat_sys_##sname, ERRNO); \ 43 long __s390_compat_sys_##sname(void) 44 45 #define SYSCALL_DEFINE0(sname) \ 46 SYSCALL_METADATA(_##sname, 0); \ 47 long __s390_sys_##sname(void); \ 48 ALLOW_ERROR_INJECTION(__s390_sys_##sname, ERRNO); \ 49 long __s390x_sys_##sname(void); \ 50 ALLOW_ERROR_INJECTION(__s390x_sys_##sname, ERRNO); \ 51 static inline long __do_sys_##sname(void); \ 52 long __s390_sys_##sname(void) \ 53 { \ 54 return __do_sys_##sname(); \ 55 } \ 56 long __s390x_sys_##sname(void) \ 57 { \ 58 return __do_sys_##sname(); \ 59 } \ 60 static inline long __do_sys_##sname(void) 61 62 #define COND_SYSCALL(name) \ 63 cond_syscall(__s390x_sys_##name); \ 64 cond_syscall(__s390_sys_##name) 65 66 #define COMPAT_SYSCALL_DEFINEx(x, name, ...) \ 67 long __s390_compat_sys##name(struct pt_regs *regs); \ 68 ALLOW_ERROR_INJECTION(__s390_compat_sys##name, ERRNO); \ 69 static inline long __se_compat_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)); \ 70 static inline long __do_compat_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__)); \ 71 long __s390_compat_sys##name(struct pt_regs *regs) \ 72 { \ 73 return __se_compat_sys##name(SC_S390_REGS_TO_ARGS(x, __VA_ARGS__)); \ 74 } \ 75 static inline long __se_compat_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)) \ 76 { \ 77 __MAP(x, __SC_TEST, __VA_ARGS__); \ 78 return __do_compat_sys##name(__MAP(x, __SC_DELOUSE, __VA_ARGS__)); \ 79 } \ 80 static inline long __do_compat_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__)) 81 82 /* 83 * As some compat syscalls may not be implemented, we need to expand 84 * COND_SYSCALL_COMPAT in kernel/sys_ni.c to cover this case as well. 85 */ 86 #define COND_SYSCALL_COMPAT(name) \ 87 cond_syscall(__s390_compat_sys_##name) 88 89 #define __S390_SYS_STUBx(x, name, ...) \ 90 long __s390_sys##name(struct pt_regs *regs); \ 91 ALLOW_ERROR_INJECTION(__s390_sys##name, ERRNO); \ 92 static inline long ___se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)); \ 93 long __s390_sys##name(struct pt_regs *regs) \ 94 { \ 95 return ___se_sys##name(SC_S390_REGS_TO_ARGS(x, __VA_ARGS__)); \ 96 } \ 97 static inline long ___se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)) \ 98 { \ 99 __MAP(x, __SC_TEST, __VA_ARGS__); \ 100 return __do_sys##name(__MAP(x, __SC_COMPAT_CAST, __VA_ARGS__)); \ 101 } 102 103 #else /* CONFIG_COMPAT */ 104 105 #define SYSCALL_DEFINE0(sname) \ 106 SYSCALL_METADATA(_##sname, 0); \ 107 long __s390x_sys_##sname(void); \ 108 ALLOW_ERROR_INJECTION(__s390x_sys_##sname, ERRNO); \ 109 static inline long __do_sys_##sname(void); \ 110 long __s390x_sys_##sname(void) \ 111 { \ 112 return __do_sys_##sname(); \ 113 } \ 114 static inline long __do_sys_##sname(void) 115 116 #define COND_SYSCALL(name) \ 117 cond_syscall(__s390x_sys_##name) 118 119 #define __S390_SYS_STUBx(x, fullname, name, ...) 120 121 #endif /* CONFIG_COMPAT */ 122 123 #define __SYSCALL_DEFINEx(x, name, ...) \ 124 long __s390x_sys##name(struct pt_regs *regs); \ 125 ALLOW_ERROR_INJECTION(__s390x_sys##name, ERRNO); \ 126 static inline long __se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)); \ 127 static inline long __do_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__)); \ 128 __S390_SYS_STUBx(x, name, __VA_ARGS__); \ 129 long __s390x_sys##name(struct pt_regs *regs) \ 130 { \ 131 return __se_sys##name(SC_S390_REGS_TO_ARGS(x, __VA_ARGS__)); \ 132 } \ 133 static inline long __se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)) \ 134 { \ 135 __MAP(x, __SC_TEST, __VA_ARGS__); \ 136 return __do_sys##name(__MAP(x, __SC_CAST, __VA_ARGS__)); \ 137 } \ 138 static inline long __do_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__)) 139 140 #endif /* _ASM_S390_SYSCALL_WRAPPER_H */ 141