| //===-- Linux implementation of syscall -----------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "src/unistd/syscall.h" |
| |
| #include "src/__support/OSUtil/syscall.h" // For internal syscall function. |
| #include "src/__support/common.h" |
| |
| #include "src/errno/libc_errno.h" |
| #include <stdarg.h> |
| |
| namespace LIBC_NAMESPACE { |
| |
| LLVM_LIBC_FUNCTION(long, __llvm_libc_syscall, |
| (long number, long arg1, long arg2, long arg3, long arg4, |
| long arg5, long arg6)) { |
| long ret = LIBC_NAMESPACE::syscall_impl<long>(number, arg1, arg2, arg3, arg4, |
| arg5, arg6); |
| // Syscalls may return large positive values that overflow, but will never |
| // return values between -4096 and -1 |
| if (static_cast<unsigned long>(ret) > -4096UL) { |
| libc_errno = static_cast<int>(-ret); |
| return -1; |
| } |
| return ret; |
| } |
| |
| } // namespace LIBC_NAMESPACE |