/* * Common syscall type defines * * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. */ #ifndef _SYSCALLS_COMMON_H #define _SYSCALLS_COMMON_H 1 #ifndef _SYSCALL_H # error "Never use <bits/syscalls-common.h> directly; include <sys/syscall.h> instead." #endif #ifndef SYS_ify # define SYS_ify(syscall_name) (__NR_##syscall_name) #endif #ifndef __ASSEMBLER__ #include <errno.h> #ifndef INTERNAL_SYSCALL_DECL # define INTERNAL_SYSCALL_DECL(err) do { } while (0) #endif #ifndef INTERNAL_SYSCALL_ERROR_P # define INTERNAL_SYSCALL_ERROR_P(val, err) ((unsigned long)val >= (unsigned long)(-4095)) #endif #ifndef INTERNAL_SYSCALL_ERRNO # define INTERNAL_SYSCALL_ERRNO(val, err) (-(val)) #endif /* Define a macro which expands into the inline wrapper code for a system call */ #ifndef INLINE_SYSCALL # define INLINE_SYSCALL(name, nr, args...) INLINE_SYSCALL_NCS(__NR_##name, nr, args) #endif /* Just like INLINE_SYSCALL(), but take a non-constant syscall (NCS) argument */ #ifndef INLINE_SYSCALL_NCS # define INLINE_SYSCALL_NCS(name, nr, args...) \ ({ \ INTERNAL_SYSCALL_DECL(__err); \ long __res = INTERNAL_SYSCALL_NCS(name, __err, nr, args); \ if (unlikely(INTERNAL_SYSCALL_ERROR_P(__res, __err))) { \ __set_errno(INTERNAL_SYSCALL_ERRNO(__res, __err)); \ __res = -1L; \ } \ __res; \ }) #endif /* No point in forcing people to implement both when they only need one */ #ifndef INTERNAL_SYSCALL # define INTERNAL_SYSCALL(name, err, nr, args...) INTERNAL_SYSCALL_NCS(__NR_##name, err, nr, args) #endif #ifndef INTERNAL_SYSCALL_NCS # error your port needs to define INTERNAL_SYSCALL_NCS in bits/syscalls.h #endif #ifndef _syscall0 #define C_DECL_ARGS_0() void #define C_DECL_ARGS_1(t, v) t v #define C_DECL_ARGS_2(t, v, args...) t v, C_DECL_ARGS_1(args) #define C_DECL_ARGS_3(t, v, args...) t v, C_DECL_ARGS_2(args) #define C_DECL_ARGS_4(t, v, args...) t v, C_DECL_ARGS_3(args) #define C_DECL_ARGS_5(t, v, args...) t v, C_DECL_ARGS_4(args) #define C_DECL_ARGS_6(t, v, args...) t v, C_DECL_ARGS_5(args) #define C_ARGS_0() #define C_ARGS_1(t, v) v #define C_ARGS_2(t, v, args...) v, C_ARGS_1(args) #define C_ARGS_3(t, v, args...) v, C_ARGS_2(args) #define C_ARGS_4(t, v, args...) v, C_ARGS_3(args) #define C_ARGS_5(t, v, args...) v, C_ARGS_4(args) #define C_ARGS_6(t, v, args...) v, C_ARGS_5(args) #define SYSCALL_FUNC(nargs, type, name, args...) \ type name(C_DECL_ARGS_##nargs(args)) { \ return (type)INLINE_SYSCALL(name, nargs, C_ARGS_##nargs(args)); \ } #define _syscall0(args...) SYSCALL_FUNC(0, args) #define _syscall1(args...) SYSCALL_FUNC(1, args) #define _syscall2(args...) SYSCALL_FUNC(2, args) #define _syscall3(args...) SYSCALL_FUNC(3, args) #define _syscall4(args...) SYSCALL_FUNC(4, args) #define _syscall5(args...) SYSCALL_FUNC(5, args) #define _syscall6(args...) SYSCALL_FUNC(6, args) #endif /* _syscall0 */ #endif /* __ASSEMBLER__ */ #endif