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Commit 46836613 authored by Al Viro's avatar Al Viro
Browse files

COMPAT_SYSCALL_DEFINE: infrastructure 



Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 541880d9

arch/s390/include/asm/compat.h

+3 −0
Original line number Diff line number Diff line
@@ -7,6 +7,9 @@ 
#include <linux/sched.h>

#include <linux/thread_info.h>



#define __TYPE_IS_PTR(t) (!__builtin_types_compatible_p(typeof(0?(t)0:0ULL), u64))

#define __SC_DELOUSE(t,v) (t)(__TYPE_IS_PTR(t) ? ((v) & 0x7fffffff) : (v))



#define PSW32_MASK_PER		0x40000000UL

#define PSW32_MASK_DAT		0x04000000UL

#define PSW32_MASK_IO		0x02000000UL

include/linux/compat.h

+42 −0
Original line number Diff line number Diff line
@@ -23,6 +23,48 @@ 
#define COMPAT_USE_64BIT_TIME 0

#endif



#ifndef __SC_DELOUSE

#define __SC_DELOUSE(t,v) ((t)(unsigned long)(v))

#endif



#define __SC_CCAST1(t1, a1)      __SC_DELOUSE(t1,a1)

#define __SC_CCAST2(t2, a2, ...) __SC_DELOUSE(t2,a2), __SC_CCAST1(__VA_ARGS__)

#define __SC_CCAST3(t3, a3, ...) __SC_DELOUSE(t3,a3), __SC_CCAST2(__VA_ARGS__)

#define __SC_CCAST4(t4, a4, ...) __SC_DELOUSE(t4,a4), __SC_CCAST3(__VA_ARGS__)

#define __SC_CCAST5(t5, a5, ...) __SC_DELOUSE(t5,a5), __SC_CCAST4(__VA_ARGS__)

#define __SC_CCAST6(t6, a6, ...) __SC_DELOUSE(t6,a6), __SC_CCAST5(__VA_ARGS__)

#define COMPAT_SYSCALL_DEFINE1(name, ...) \

        COMPAT_SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)

#define COMPAT_SYSCALL_DEFINE2(name, ...) \

	COMPAT_SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)

#define COMPAT_SYSCALL_DEFINE3(name, ...) \

	COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)

#define COMPAT_SYSCALL_DEFINE4(name, ...) \

	COMPAT_SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)

#define COMPAT_SYSCALL_DEFINE5(name, ...) \

	COMPAT_SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)

#define COMPAT_SYSCALL_DEFINE6(name, ...) \

	COMPAT_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)



#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS



#define COMPAT_SYSCALL_DEFINEx(x, name, ...)				\

	asmlinkage long compat_sys##name(__SC_DECL##x(__VA_ARGS__));	\

	static inline long C_SYSC##name(__SC_DECL##x(__VA_ARGS__));	\

	asmlinkage long compat_SyS##name(__SC_LONG##x(__VA_ARGS__))	\

	{								\

		return (long) C_SYSC##name(__SC_CCAST##x(__VA_ARGS__));	\

	}								\

	SYSCALL_ALIAS(compat_sys##name, compat_SyS##name);		\

	static inline long C_SYSC##name(__SC_DECL##x(__VA_ARGS__))



#else /* CONFIG_HAVE_SYSCALL_WRAPPERS */



#define COMPAT_SYSCALL_DEFINEx(x, name, ...)				\

	asmlinkage long compat_sys##name(__SC_DECL##x(__VA_ARGS__))



#endif /* CONFIG_HAVE_SYSCALL_WRAPPERS */



#define compat_jiffies_to_clock_t(x)	\

		(((unsigned long)(x) * COMPAT_USER_HZ) / HZ)