1 | /* Copyright (C) 2015-2017 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 | /* Set error number and return -1. A target may choose to return the |
22 | internal function, __syscall_error, which sets errno and returns -1. |
23 | We use -1l, instead of -1, so that it can be casted to (void *). */ |
24 | #define INLINE_SYSCALL_ERROR_RETURN_VALUE(err) \ |
25 | ({ \ |
26 | __set_errno (err); \ |
27 | -1l; \ |
28 | }) |
29 | |
30 | /* Provide a dummy argument that can be used to force register |
31 | alignment for register pairs if required by the syscall ABI. */ |
32 | #ifdef __ASSUME_ALIGNED_REGISTER_PAIRS |
33 | #define __ALIGNMENT_ARG 0, |
34 | #define __ALIGNMENT_COUNT(a,b) b |
35 | #else |
36 | #define __ALIGNMENT_ARG |
37 | #define __ALIGNMENT_COUNT(a,b) a |
38 | #endif |
39 | |
40 | /* Provide a common macro to pass 64-bit value on syscalls. */ |
41 | #if __WORDSIZE == 64 || defined __ASSUME_WORDSIZE64_ILP32 |
42 | # define SYSCALL_LL(val) (val) |
43 | # define SYSCALL_LL64(val) (val) |
44 | #else |
45 | #define SYSCALL_LL(val) \ |
46 | __LONG_LONG_PAIR ((val) >> 31, (val)) |
47 | #define SYSCALL_LL64(val) \ |
48 | __LONG_LONG_PAIR ((long) ((val) >> 32), (long) ((val) & 0xffffffff)) |
49 | #endif |
50 | |
51 | /* Provide a common macro to pass 64-bit value on pread and pwrite |
52 | syscalls. */ |
53 | #ifdef __ASSUME_PRW_DUMMY_ARG |
54 | # define SYSCALL_LL_PRW(val) 0, SYSCALL_LL (val) |
55 | # define SYSCALL_LL64_PRW(val) 0, SYSCALL_LL64 (val) |
56 | #else |
57 | # define SYSCALL_LL_PRW(val) __ALIGNMENT_ARG SYSCALL_LL (val) |
58 | # define SYSCALL_LL64_PRW(val) __ALIGNMENT_ARG SYSCALL_LL64 (val) |
59 | #endif |
60 | |
61 | /* Provide a macro to pass the off{64}_t argument on p{readv,writev}{64}. */ |
62 | #define LO_HI_LONG(val) \ |
63 | (long) (val), \ |
64 | (long) (((uint64_t) (val)) >> 32) |
65 | |