1/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18#include <sysdeps/generic/sysdep.h>
19
20#include <sys/syscall.h>
21#define HAVE_SYSCALLS
22
23/* Note that using a `PASTE' macro loses. */
24#define SYSCALL__(name, args) PSEUDO (__##name, name, args)
25#define SYSCALL(name, args) PSEUDO (name, name, args)
26
27#define __SYSCALL0(name) \
28 INLINE_SYSCALL (name, 0)
29#define __SYSCALL1(name, a1) \
30 INLINE_SYSCALL (name, 1, a1)
31#define __SYSCALL2(name, a1, a2) \
32 INLINE_SYSCALL (name, 2, a1, a2)
33#define __SYSCALL3(name, a1, a2, a3) \
34 INLINE_SYSCALL (name, 3, a1, a2, a3)
35#define __SYSCALL4(name, a1, a2, a3, a4) \
36 INLINE_SYSCALL (name, 4, a1, a2, a3, a4)
37#define __SYSCALL5(name, a1, a2, a3, a4, a5) \
38 INLINE_SYSCALL (name, 5, a1, a2, a3, a4, a5)
39#define __SYSCALL6(name, a1, a2, a3, a4, a5, a6) \
40 INLINE_SYSCALL (name, 6, a1, a2, a3, a4, a5, a6)
41#define __SYSCALL7(name, a1, a2, a3, a4, a5, a6, a7) \
42 INLINE_SYSCALL (name, 7, a1, a2, a3, a4, a5, a6, a7)
43
44#define __SYSCALL_NARGS_X(a,b,c,d,e,f,g,h,n,...) n
45#define __SYSCALL_NARGS(...) \
46 __SYSCALL_NARGS_X (__VA_ARGS__,7,6,5,4,3,2,1,0,)
47#define __SYSCALL_CONCAT_X(a,b) a##b
48#define __SYSCALL_CONCAT(a,b) __SYSCALL_CONCAT_X (a, b)
49#define __SYSCALL_DISP(b,...) \
50 __SYSCALL_CONCAT (b,__SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__)
51
52#define __SYSCALL_CALL(...) __SYSCALL_DISP (__SYSCALL, __VA_ARGS__)
53
54#define SYSCALL_CANCEL(...) \
55 ({ \
56 long int sc_ret; \
57 if (SINGLE_THREAD_P) \
58 sc_ret = __SYSCALL_CALL (__VA_ARGS__); \
59 else \
60 { \
61 int sc_cancel_oldtype = LIBC_CANCEL_ASYNC (); \
62 sc_ret = __SYSCALL_CALL (__VA_ARGS__); \
63 LIBC_CANCEL_RESET (sc_cancel_oldtype); \
64 } \
65 sc_ret; \
66 })
67
68/* Machine-dependent sysdep.h files are expected to define the macro
69 PSEUDO (function_name, syscall_name) to emit assembly code to define the
70 C-callable function FUNCTION_NAME to do system call SYSCALL_NAME.
71 r0 and r1 are the system call outputs. MOVE(x, y) should be defined as
72 an instruction such that "MOVE(r1, r0)" works. ret should be defined
73 as the return instruction. */
74
75#ifndef SYS_ify
76#define SYS_ify(syscall_name) SYS_##syscall_name
77#endif
78
79/* Terminate a system call named SYM. This is used on some platforms
80 to generate correct debugging information. */
81#ifndef PSEUDO_END
82#define PSEUDO_END(sym)
83#endif
84#ifndef PSEUDO_END_NOERRNO
85#define PSEUDO_END_NOERRNO(sym) PSEUDO_END(sym)
86#endif
87#ifndef PSEUDO_END_ERRVAL
88#define PSEUDO_END_ERRVAL(sym) PSEUDO_END(sym)
89#endif
90
91/* Wrappers around system calls should normally inline the system call code.
92 But sometimes it is not possible or implemented and we use this code. */
93#ifndef INLINE_SYSCALL
94#define INLINE_SYSCALL(name, nr, args...) __syscall_##name (args)
95#endif
96