libc/src/__support/OSUtil/linux/x86_64/vdso.h

//===---------- x86/x86_64 vdso configuration ---------------------* C++ *-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_X86_64_VDSO_H
#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_X86_64_VDSO_H
#include "src/__support/CPP/string_view.h"
#include "src/__support/OSUtil/linux/vdso_sym.h"
namespace LIBC_NAMESPACE_DECL {
namespace vdso {
// translate VDSOSym to symbol names
// On x86, there are symbols defined without the __vdso_ prefix, however,
// it is suggested that one should use the __vdso_ prefix.
// Additionally, there is also an __vdso_sgx_enter_enclave, it is for the SGX
// support, we do not include it here for now.
// https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/entry/vdso/vdso.lds.S
LIBC_INLINE constexpr cpp::string_view symbol_name(VDSOSym sym) {
  switch (sym) {
  case VDSOSym::ClockGetTime:
    return "__vdso_clock_gettime";
  case VDSOSym::GetTimeOfDay:
    return "__vdso_gettimeofday";
  case VDSOSym::GetCpu:
    return "__vdso_getcpu";
  case VDSOSym::Time:
    return "__vdso_time";
  case VDSOSym::ClockGetRes:
    return "__vdso_clock_getres";
  default:
    return "";
  }
}

// symbol versions
LIBC_INLINE constexpr cpp::string_view symbol_version(VDSOSym) {
  return "LINUX_2.6";
}
} // namespace vdso
} // namespace LIBC_NAMESPACE_DECL
#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_X86_64_VDSO_H