diff options
Diffstat (limited to 'arch/s390/include/asm/syscall_wrapper.h')
| -rw-r--r-- | arch/s390/include/asm/syscall_wrapper.h | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/arch/s390/include/asm/syscall_wrapper.h b/arch/s390/include/asm/syscall_wrapper.h new file mode 100644 index 000000000..35c1d1b86 --- /dev/null +++ b/arch/s390/include/asm/syscall_wrapper.h @@ -0,0 +1,140 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * syscall_wrapper.h - s390 specific wrappers to syscall definitions + * + */ + +#ifndef _ASM_S390_SYSCALL_WRAPPER_H +#define _ASM_S390_SYSCALL_WRAPPER_H + +/* Mapping of registers to parameters for syscalls */ +#define SC_S390_REGS_TO_ARGS(x, ...) \ + __MAP(x, __SC_ARGS \ + ,, regs->orig_gpr2,, regs->gprs[3],, regs->gprs[4] \ + ,, regs->gprs[5],, regs->gprs[6],, regs->gprs[7]) + +#ifdef CONFIG_COMPAT + +#define __SC_COMPAT_CAST(t, a) \ +({ \ + long __ReS = a; \ + \ + BUILD_BUG_ON((sizeof(t) > 4) && !__TYPE_IS_L(t) && \ + !__TYPE_IS_UL(t) && !__TYPE_IS_PTR(t) && \ + !__TYPE_IS_LL(t)); \ + if (__TYPE_IS_L(t)) \ + __ReS = (s32)a; \ + if (__TYPE_IS_UL(t)) \ + __ReS = (u32)a; \ + if (__TYPE_IS_PTR(t)) \ + __ReS = a & 0x7fffffff; \ + if (__TYPE_IS_LL(t)) \ + return -ENOSYS; \ + (t)__ReS; \ +}) + +/* + * To keep the naming coherent, re-define SYSCALL_DEFINE0 to create an alias + * named __s390x_sys_*() + */ +#define COMPAT_SYSCALL_DEFINE0(sname) \ + long __s390_compat_sys_##sname(void); \ + ALLOW_ERROR_INJECTION(__s390_compat_sys_##sname, ERRNO); \ + long __s390_compat_sys_##sname(void) + +#define SYSCALL_DEFINE0(sname) \ + SYSCALL_METADATA(_##sname, 0); \ + long __s390_sys_##sname(void); \ + ALLOW_ERROR_INJECTION(__s390_sys_##sname, ERRNO); \ + long __s390x_sys_##sname(void); \ + ALLOW_ERROR_INJECTION(__s390x_sys_##sname, ERRNO); \ + static inline long __do_sys_##sname(void); \ + long __s390_sys_##sname(void) \ + { \ + return __do_sys_##sname(); \ + } \ + long __s390x_sys_##sname(void) \ + { \ + return __do_sys_##sname(); \ + } \ + static inline long __do_sys_##sname(void) + +#define COND_SYSCALL(name) \ + cond_syscall(__s390x_sys_##name); \ + cond_syscall(__s390_sys_##name) + +#define COMPAT_SYSCALL_DEFINEx(x, name, ...) \ + long __s390_compat_sys##name(struct pt_regs *regs); \ + ALLOW_ERROR_INJECTION(__s390_compat_sys##name, ERRNO); \ + static inline long __se_compat_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)); \ + static inline long __do_compat_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__)); \ + long __s390_compat_sys##name(struct pt_regs *regs) \ + { \ + return __se_compat_sys##name(SC_S390_REGS_TO_ARGS(x, __VA_ARGS__)); \ + } \ + static inline long __se_compat_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)) \ + { \ + __MAP(x, __SC_TEST, __VA_ARGS__); \ + return __do_compat_sys##name(__MAP(x, __SC_DELOUSE, __VA_ARGS__)); \ + } \ + static inline long __do_compat_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__)) + +/* + * As some compat syscalls may not be implemented, we need to expand + * COND_SYSCALL_COMPAT in kernel/sys_ni.c to cover this case as well. + */ +#define COND_SYSCALL_COMPAT(name) \ + cond_syscall(__s390_compat_sys_##name) + +#define __S390_SYS_STUBx(x, name, ...) \ + long __s390_sys##name(struct pt_regs *regs); \ + ALLOW_ERROR_INJECTION(__s390_sys##name, ERRNO); \ + static inline long ___se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)); \ + long __s390_sys##name(struct pt_regs *regs) \ + { \ + return ___se_sys##name(SC_S390_REGS_TO_ARGS(x, __VA_ARGS__)); \ + } \ + static inline long ___se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)) \ + { \ + __MAP(x, __SC_TEST, __VA_ARGS__); \ + return __do_sys##name(__MAP(x, __SC_COMPAT_CAST, __VA_ARGS__)); \ + } + +#else /* CONFIG_COMPAT */ + +#define SYSCALL_DEFINE0(sname) \ + SYSCALL_METADATA(_##sname, 0); \ + long __s390x_sys_##sname(void); \ + ALLOW_ERROR_INJECTION(__s390x_sys_##sname, ERRNO); \ + static inline long __do_sys_##sname(void); \ + long __s390x_sys_##sname(void) \ + { \ + return __do_sys_##sname(); \ + } \ + static inline long __do_sys_##sname(void) + +#define COND_SYSCALL(name) \ + cond_syscall(__s390x_sys_##name) + +#define __S390_SYS_STUBx(x, fullname, name, ...) + +#endif /* CONFIG_COMPAT */ + +#define __SYSCALL_DEFINEx(x, name, ...) \ + long __s390x_sys##name(struct pt_regs *regs); \ + ALLOW_ERROR_INJECTION(__s390x_sys##name, ERRNO); \ + static inline long __se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)); \ + static inline long __do_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__)); \ + __S390_SYS_STUBx(x, name, __VA_ARGS__); \ + long __s390x_sys##name(struct pt_regs *regs) \ + { \ + return __se_sys##name(SC_S390_REGS_TO_ARGS(x, __VA_ARGS__)); \ + } \ + static inline long __se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)) \ + { \ + __MAP(x, __SC_TEST, __VA_ARGS__); \ + return __do_sys##name(__MAP(x, __SC_CAST, __VA_ARGS__)); \ + } \ + static inline long __do_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__)) + +#endif /* _ASM_S390_SYSCALL_WRAPPER_H */ |