1/* Copyright (C) 1991-2018 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 __SYSCALL_CONCAT_X(a,b) a##b
28#define __SYSCALL_CONCAT(a,b) __SYSCALL_CONCAT_X (a, b)
29
30
31#define __INTERNAL_SYSCALL0(name, err) \
32 INTERNAL_SYSCALL (name, err, 0)
33#define __INTERNAL_SYSCALL1(name, err, a1) \
34 INTERNAL_SYSCALL (name, err, 1, a1)
35#define __INTERNAL_SYSCALL2(name, err, a1, a2) \
36 INTERNAL_SYSCALL (name, err, 2, a1, a2)
37#define __INTERNAL_SYSCALL3(name, err, a1, a2, a3) \
38 INTERNAL_SYSCALL (name, err, 3, a1, a2, a3)
39#define __INTERNAL_SYSCALL4(name, err, a1, a2, a3, a4) \
40 INTERNAL_SYSCALL (name, err, 4, a1, a2, a3, a4)
41#define __INTERNAL_SYSCALL5(name, err, a1, a2, a3, a4, a5) \
42 INTERNAL_SYSCALL (name, err, 5, a1, a2, a3, a4, a5)
43#define __INTERNAL_SYSCALL6(name, err, a1, a2, a3, a4, a5, a6) \
44 INTERNAL_SYSCALL (name, err, 6, a1, a2, a3, a4, a5, a6)
45#define __INTERNAL_SYSCALL7(name, err, a1, a2, a3, a4, a5, a6, a7) \
46 INTERNAL_SYSCALL (name, err, 7, a1, a2, a3, a4, a5, a6, a7)
47
48#define __INTERNAL_SYSCALL_NARGS_X(a,b,c,d,e,f,g,h,n,o,...) o
49#define __INTERNAL_SYSCALL_NARGS(...) \
50 __INTERNAL_SYSCALL_NARGS_X (__VA_ARGS__,7,6,5,4,3,2,1,0,)
51#define __INTERNAL_SYSCALL_DISP(b,...) \
52 __SYSCALL_CONCAT (b,__INTERNAL_SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__)
53
54/* Issue a syscall defined by syscall number plus any other argument required.
55 It is similar to INTERNAL_SYSCALL macro, but without the need to pass the
56 expected argument number as second parameter. */
57#define INTERNAL_SYSCALL_CALL(...) \
58 __INTERNAL_SYSCALL_DISP (__INTERNAL_SYSCALL, __VA_ARGS__)
59
60#define __INLINE_SYSCALL0(name) \
61 INLINE_SYSCALL (name, 0)
62#define __INLINE_SYSCALL1(name, a1) \
63 INLINE_SYSCALL (name, 1, a1)
64#define __INLINE_SYSCALL2(name, a1, a2) \
65 INLINE_SYSCALL (name, 2, a1, a2)
66#define __INLINE_SYSCALL3(name, a1, a2, a3) \
67 INLINE_SYSCALL (name, 3, a1, a2, a3)
68#define __INLINE_SYSCALL4(name, a1, a2, a3, a4) \
69 INLINE_SYSCALL (name, 4, a1, a2, a3, a4)
70#define __INLINE_SYSCALL5(name, a1, a2, a3, a4, a5) \
71 INLINE_SYSCALL (name, 5, a1, a2, a3, a4, a5)
72#define __INLINE_SYSCALL6(name, a1, a2, a3, a4, a5, a6) \
73 INLINE_SYSCALL (name, 6, a1, a2, a3, a4, a5, a6)
74#define __INLINE_SYSCALL7(name, a1, a2, a3, a4, a5, a6, a7) \
75 INLINE_SYSCALL (name, 7, a1, a2, a3, a4, a5, a6, a7)
76
77#define __INLINE_SYSCALL_NARGS_X(a,b,c,d,e,f,g,h,n,...) n
78#define __INLINE_SYSCALL_NARGS(...) \
79 __INLINE_SYSCALL_NARGS_X (__VA_ARGS__,7,6,5,4,3,2,1,0,)
80#define __INLINE_SYSCALL_DISP(b,...) \
81 __SYSCALL_CONCAT (b,__INLINE_SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__)
82
83/* Issue a syscall defined by syscall number plus any other argument
84 required. Any error will be handled using arch defined macros and errno
85 will be set accordingly.
86 It is similar to INLINE_SYSCALL macro, but without the need to pass the
87 expected argument number as second parameter. */
88#define INLINE_SYSCALL_CALL(...) \
89 __INLINE_SYSCALL_DISP (__INLINE_SYSCALL, __VA_ARGS__)
90
91#define SYSCALL_CANCEL(...) \
92 ({ \
93 long int sc_ret; \
94 if (SINGLE_THREAD_P) \
95 sc_ret = INLINE_SYSCALL_CALL (__VA_ARGS__); \
96 else \
97 { \
98 int sc_cancel_oldtype = LIBC_CANCEL_ASYNC (); \
99 sc_ret = INLINE_SYSCALL_CALL (__VA_ARGS__); \
100 LIBC_CANCEL_RESET (sc_cancel_oldtype); \
101 } \
102 sc_ret; \
103 })
104
105/* Machine-dependent sysdep.h files are expected to define the macro
106 PSEUDO (function_name, syscall_name) to emit assembly code to define the
107 C-callable function FUNCTION_NAME to do system call SYSCALL_NAME.
108 r0 and r1 are the system call outputs. MOVE(x, y) should be defined as
109 an instruction such that "MOVE(r1, r0)" works. ret should be defined
110 as the return instruction. */
111
112#ifndef SYS_ify
113#define SYS_ify(syscall_name) SYS_##syscall_name
114#endif
115
116/* Terminate a system call named SYM. This is used on some platforms
117 to generate correct debugging information. */
118#ifndef PSEUDO_END
119#define PSEUDO_END(sym)
120#endif
121#ifndef PSEUDO_END_NOERRNO
122#define PSEUDO_END_NOERRNO(sym) PSEUDO_END(sym)
123#endif
124#ifndef PSEUDO_END_ERRVAL
125#define PSEUDO_END_ERRVAL(sym) PSEUDO_END(sym)
126#endif
127
128/* Wrappers around system calls should normally inline the system call code.
129 But sometimes it is not possible or implemented and we use this code. */
130#ifndef INLINE_SYSCALL
131#define INLINE_SYSCALL(name, nr, args...) __syscall_##name (args)
132#endif
133