103 lines
3.4 KiB
C
103 lines
3.4 KiB
C
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/* Copyright (C) 2015-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _SYSDEP_LINUX_H
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#define _SYSDEP_LINUX_H
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#include <bits/wordsize.h>
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#include <kernel-features.h>
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#include <endian.h>
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#include <errno.h>
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#undef INTERNAL_SYSCALL_ERROR_P
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#define INTERNAL_SYSCALL_ERROR_P(val) \
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((unsigned long int) (val) > -4096UL)
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#ifndef SYSCALL_ERROR_LABEL
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# define SYSCALL_ERROR_LABEL(sc_err) \
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({ \
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__set_errno (sc_err); \
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-1L; \
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})
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#endif
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/* Define a macro which expands into the inline wrapper code for a system
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call. It sets the errno and returns -1 on a failure, or the syscall
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return value otherwise. */
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#undef INLINE_SYSCALL
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#define INLINE_SYSCALL(name, nr, args...) \
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({ \
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long int sc_ret = INTERNAL_SYSCALL (name, nr, args); \
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__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (sc_ret)) \
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? SYSCALL_ERROR_LABEL (INTERNAL_SYSCALL_ERRNO (sc_ret)) \
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: sc_ret; \
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})
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#undef INTERNAL_SYSCALL_ERRNO
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#define INTERNAL_SYSCALL_ERRNO(val) (-(val))
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/* Set error number and return -1. A target may choose to return the
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internal function, __syscall_error, which sets errno and returns -1.
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We use -1l, instead of -1, so that it can be casted to (void *). */
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#define INLINE_SYSCALL_ERROR_RETURN_VALUE(err) \
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({ \
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__set_errno (err); \
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-1l; \
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})
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/* Provide a dummy argument that can be used to force register
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alignment for register pairs if required by the syscall ABI. */
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#ifdef __ASSUME_ALIGNED_REGISTER_PAIRS
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#define __ALIGNMENT_ARG 0,
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#define __ALIGNMENT_COUNT(a,b) b
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#else
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#define __ALIGNMENT_ARG
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#define __ALIGNMENT_COUNT(a,b) a
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#endif
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/* Provide a common macro to pass 64-bit value on syscalls. */
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#if __WORDSIZE == 64 || defined __ASSUME_WORDSIZE64_ILP32
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# define SYSCALL_LL(val) (val)
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# define SYSCALL_LL64(val) (val)
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#else
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#define SYSCALL_LL(val) \
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__LONG_LONG_PAIR ((val) >> 31, (val))
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#define SYSCALL_LL64(val) \
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__LONG_LONG_PAIR ((long) ((val) >> 32), (long) ((val) & 0xffffffff))
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#endif
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/* Provide a common macro to pass 64-bit value on pread and pwrite
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syscalls. */
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#ifdef __ASSUME_PRW_DUMMY_ARG
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# define SYSCALL_LL_PRW(val) 0, SYSCALL_LL (val)
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# define SYSCALL_LL64_PRW(val) 0, SYSCALL_LL64 (val)
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#else
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# define SYSCALL_LL_PRW(val) __ALIGNMENT_ARG SYSCALL_LL (val)
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# define SYSCALL_LL64_PRW(val) __ALIGNMENT_ARG SYSCALL_LL64 (val)
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#endif
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/* Provide a macro to pass the off{64}_t argument on p{readv,writev}{64}. */
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#define LO_HI_LONG(val) \
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(long) (val), \
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(long) (((uint64_t) (val)) >> 32)
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/* Export the ___brk_addr symbol on brk.c implementation (some ABIs export
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it due and old crtstuff.c code). */
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#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 0
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#endif /* _SYSDEP_LINUX_H */
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