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- /* Copyright (C) 2015-2019 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
- #include <bits/wordsize.h>
- #include <kernel-features.h>
- /* By default only shared builds use vdso. */
- #ifndef ALWAYS_USE_VSYSCALL
- #define ALWAYS_USE_VSYSCALL 0
- #endif
- #define USE_VSYSCALL (defined (SHARED) || ALWAYS_USE_VSYSCALL)
- /* Set error number and return -1. A target may choose to return the
- internal function, __syscall_error, which sets errno and returns -1.
- We use -1l, instead of -1, so that it can be casted to (void *). */
- #define INLINE_SYSCALL_ERROR_RETURN_VALUE(err) \
- ({ \
- __set_errno (err); \
- -1l; \
- })
- /* Provide a dummy argument that can be used to force register
- alignment for register pairs if required by the syscall ABI. */
- #ifdef __ASSUME_ALIGNED_REGISTER_PAIRS
- #define __ALIGNMENT_ARG 0,
- #define __ALIGNMENT_COUNT(a,b) b
- #else
- #define __ALIGNMENT_ARG
- #define __ALIGNMENT_COUNT(a,b) a
- #endif
- /* Provide a common macro to pass 64-bit value on syscalls. */
- #if __WORDSIZE == 64 || defined __ASSUME_WORDSIZE64_ILP32
- # define SYSCALL_LL(val) (val)
- # define SYSCALL_LL64(val) (val)
- #else
- #define SYSCALL_LL(val) \
- __LONG_LONG_PAIR ((val) >> 31, (val))
- #define SYSCALL_LL64(val) \
- __LONG_LONG_PAIR ((long) ((val) >> 32), (long) ((val) & 0xffffffff))
- #endif
- /* Provide a common macro to pass 64-bit value on pread and pwrite
- syscalls. */
- #ifdef __ASSUME_PRW_DUMMY_ARG
- # define SYSCALL_LL_PRW(val) 0, SYSCALL_LL (val)
- # define SYSCALL_LL64_PRW(val) 0, SYSCALL_LL64 (val)
- #else
- # define SYSCALL_LL_PRW(val) __ALIGNMENT_ARG SYSCALL_LL (val)
- # define SYSCALL_LL64_PRW(val) __ALIGNMENT_ARG SYSCALL_LL64 (val)
- #endif
- /* Provide a macro to pass the off{64}_t argument on p{readv,writev}{64}. */
- #define LO_HI_LONG(val) \
- (long) (val), \
- (long) (((uint64_t) (val)) >> 32)
- /* Exports the __send symbol on send.c linux implementation (some ABI have
- it missing due the usage of a old generic version without it). */
- #define HAVE_INTERNAL_SEND_SYMBOL 1
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