1 | /* Copyright (C) 2015-2019 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 <bits/wordsize.h> |
19 | #include <kernel-features.h> |
20 | |
21 | /* By default only shared builds use vdso. */ |
22 | #ifndef ALWAYS_USE_VSYSCALL |
23 | #define ALWAYS_USE_VSYSCALL 0 |
24 | #endif |
25 | |
26 | #define USE_VSYSCALL (defined (SHARED) || ALWAYS_USE_VSYSCALL) |
27 | |
28 | /* Set error number and return -1. A target may choose to return the |
29 | internal function, __syscall_error, which sets errno and returns -1. |
30 | We use -1l, instead of -1, so that it can be casted to (void *). */ |
31 | #define INLINE_SYSCALL_ERROR_RETURN_VALUE(err) \ |
32 | ({ \ |
33 | __set_errno (err); \ |
34 | -1l; \ |
35 | }) |
36 | |
37 | /* Provide a dummy argument that can be used to force register |
38 | alignment for register pairs if required by the syscall ABI. */ |
39 | #ifdef __ASSUME_ALIGNED_REGISTER_PAIRS |
40 | #define __ALIGNMENT_ARG 0, |
41 | #define __ALIGNMENT_COUNT(a,b) b |
42 | #else |
43 | #define __ALIGNMENT_ARG |
44 | #define __ALIGNMENT_COUNT(a,b) a |
45 | #endif |
46 | |
47 | /* Provide a common macro to pass 64-bit value on syscalls. */ |
48 | #if __WORDSIZE == 64 || defined __ASSUME_WORDSIZE64_ILP32 |
49 | # define SYSCALL_LL(val) (val) |
50 | # define SYSCALL_LL64(val) (val) |
51 | #else |
52 | #define SYSCALL_LL(val) \ |
53 | __LONG_LONG_PAIR ((val) >> 31, (val)) |
54 | #define SYSCALL_LL64(val) \ |
55 | __LONG_LONG_PAIR ((long) ((val) >> 32), (long) ((val) & 0xffffffff)) |
56 | #endif |
57 | |
58 | /* Provide a common macro to pass 64-bit value on pread and pwrite |
59 | syscalls. */ |
60 | #ifdef __ASSUME_PRW_DUMMY_ARG |
61 | # define SYSCALL_LL_PRW(val) 0, SYSCALL_LL (val) |
62 | # define SYSCALL_LL64_PRW(val) 0, SYSCALL_LL64 (val) |
63 | #else |
64 | # define SYSCALL_LL_PRW(val) __ALIGNMENT_ARG SYSCALL_LL (val) |
65 | # define SYSCALL_LL64_PRW(val) __ALIGNMENT_ARG SYSCALL_LL64 (val) |
66 | #endif |
67 | |
68 | /* Provide a macro to pass the off{64}_t argument on p{readv,writev}{64}. */ |
69 | #define LO_HI_LONG(val) \ |
70 | (long) (val), \ |
71 | (long) (((uint64_t) (val)) >> 32) |
72 | |
73 | /* Exports the __send symbol on send.c linux implementation (some ABI have |
74 | it missing due the usage of a old generic version without it). */ |
75 | #define HAVE_INTERNAL_SEND_SYMBOL 1 |
76 | |