152 lines
5.0 KiB
C
152 lines
5.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* syscall_wrapper.h - s390 specific wrappers to syscall definitions
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*
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*/
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#ifndef _ASM_S390_SYSCALL_WRAPPER_H
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#define _ASM_S390_SYSCALL_WRAPPER_H
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/* Mapping of registers to parameters for syscalls */
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#define SC_S390_REGS_TO_ARGS(x, ...) \
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__MAP(x, __SC_ARGS \
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,, regs->orig_gpr2,, regs->gprs[3],, regs->gprs[4] \
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,, regs->gprs[5],, regs->gprs[6],, regs->gprs[7])
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#ifdef CONFIG_COMPAT
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#define __SC_COMPAT_CAST(t, a) \
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({ \
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long __ReS = a; \
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\
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BUILD_BUG_ON((sizeof(t) > 4) && !__TYPE_IS_L(t) && \
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!__TYPE_IS_UL(t) && !__TYPE_IS_PTR(t) && \
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!__TYPE_IS_LL(t)); \
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if (__TYPE_IS_L(t)) \
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__ReS = (s32)a; \
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if (__TYPE_IS_UL(t)) \
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__ReS = (u32)a; \
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if (__TYPE_IS_PTR(t)) \
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__ReS = a & 0x7fffffff; \
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if (__TYPE_IS_LL(t)) \
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return -ENOSYS; \
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(t)__ReS; \
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})
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/*
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* To keep the naming coherent, re-define SYSCALL_DEFINE0 to create an alias
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* named __s390x_sys_*()
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*/
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#define COMPAT_SYSCALL_DEFINE0(sname) \
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long __s390_compat_sys_##sname(void); \
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ALLOW_ERROR_INJECTION(__s390_compat_sys_##sname, ERRNO); \
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long __s390_compat_sys_##sname(void)
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#define SYSCALL_DEFINE0(sname) \
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SYSCALL_METADATA(_##sname, 0); \
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long __s390_sys_##sname(void); \
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ALLOW_ERROR_INJECTION(__s390_sys_##sname, ERRNO); \
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long __s390x_sys_##sname(void); \
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ALLOW_ERROR_INJECTION(__s390x_sys_##sname, ERRNO); \
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static inline long __do_sys_##sname(void); \
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long __s390_sys_##sname(void) \
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{ \
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return __do_sys_##sname(); \
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} \
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long __s390x_sys_##sname(void) \
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{ \
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return __do_sys_##sname(); \
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} \
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static inline long __do_sys_##sname(void)
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#define COND_SYSCALL(name) \
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cond_syscall(__s390x_sys_##name); \
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cond_syscall(__s390_sys_##name)
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#define SYS_NI(name) \
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SYSCALL_ALIAS(__s390x_sys_##name, sys_ni_posix_timers); \
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SYSCALL_ALIAS(__s390_sys_##name, sys_ni_posix_timers)
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#define COMPAT_SYSCALL_DEFINEx(x, name, ...) \
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long __s390_compat_sys##name(struct pt_regs *regs); \
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ALLOW_ERROR_INJECTION(__s390_compat_sys##name, ERRNO); \
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static inline long __se_compat_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)); \
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static inline long __do_compat_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__)); \
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long __s390_compat_sys##name(struct pt_regs *regs) \
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{ \
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return __se_compat_sys##name(SC_S390_REGS_TO_ARGS(x, __VA_ARGS__)); \
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} \
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static inline long __se_compat_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)) \
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{ \
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__MAP(x, __SC_TEST, __VA_ARGS__); \
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return __do_compat_sys##name(__MAP(x, __SC_DELOUSE, __VA_ARGS__)); \
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} \
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static inline long __do_compat_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__))
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/*
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* As some compat syscalls may not be implemented, we need to expand
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* COND_SYSCALL_COMPAT in kernel/sys_ni.c and COMPAT_SYS_NI in
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* kernel/time/posix-stubs.c to cover this case as well.
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*/
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#define COND_SYSCALL_COMPAT(name) \
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cond_syscall(__s390_compat_sys_##name)
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#define COMPAT_SYS_NI(name) \
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SYSCALL_ALIAS(__s390_compat_sys_##name, sys_ni_posix_timers)
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#define __S390_SYS_STUBx(x, name, ...) \
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long __s390_sys##name(struct pt_regs *regs); \
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ALLOW_ERROR_INJECTION(__s390_sys##name, ERRNO); \
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static inline long ___se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)); \
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long __s390_sys##name(struct pt_regs *regs) \
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{ \
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return ___se_sys##name(SC_S390_REGS_TO_ARGS(x, __VA_ARGS__)); \
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} \
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static inline long ___se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)) \
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{ \
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__MAP(x, __SC_TEST, __VA_ARGS__); \
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return __do_sys##name(__MAP(x, __SC_COMPAT_CAST, __VA_ARGS__)); \
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}
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#else /* CONFIG_COMPAT */
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#define SYSCALL_DEFINE0(sname) \
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SYSCALL_METADATA(_##sname, 0); \
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long __s390x_sys_##sname(void); \
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ALLOW_ERROR_INJECTION(__s390x_sys_##sname, ERRNO); \
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static inline long __do_sys_##sname(void); \
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long __s390x_sys_##sname(void) \
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{ \
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return __do_sys_##sname(); \
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} \
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static inline long __do_sys_##sname(void)
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#define COND_SYSCALL(name) \
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cond_syscall(__s390x_sys_##name)
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#define SYS_NI(name) \
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SYSCALL_ALIAS(__s390x_sys_##name, sys_ni_posix_timers)
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#define __S390_SYS_STUBx(x, fullname, name, ...)
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#endif /* CONFIG_COMPAT */
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#define __SYSCALL_DEFINEx(x, name, ...) \
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long __s390x_sys##name(struct pt_regs *regs); \
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ALLOW_ERROR_INJECTION(__s390x_sys##name, ERRNO); \
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static inline long __se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)); \
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static inline long __do_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__)); \
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__S390_SYS_STUBx(x, name, __VA_ARGS__); \
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long __s390x_sys##name(struct pt_regs *regs) \
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{ \
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return __se_sys##name(SC_S390_REGS_TO_ARGS(x, __VA_ARGS__)); \
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} \
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static inline long __se_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)) \
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{ \
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__MAP(x, __SC_TEST, __VA_ARGS__); \
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return __do_sys##name(__MAP(x, __SC_CAST, __VA_ARGS__)); \
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} \
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static inline long __do_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__))
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#endif /* _ASM_S390_SYSCALL_WRAPPER_H */
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