1 //===------------- Linux VDSO Symbols ---------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 #include "hdr/types/clock_t.h"
9 #include "hdr/types/clockid_t.h"
10 #include "hdr/types/struct_timespec.h"
11 #include "hdr/types/struct_timeval.h"
12 #include "hdr/types/time_t.h"
13 #include "src/__support/common.h"
14 #include <stddef.h> // For size_t.
15
16 // NOLINTBEGIN(llvmlibc-implementation-in-namespace)
17 // TODO: some of the following can be defined via proxy headers.
18 struct __kernel_timespec;
19 struct timezone;
20 struct riscv_hwprobe;
21 struct getcpu_cache;
22 struct cpu_set_t;
23 // NOLINTEND(llvmlibc-implementation-in-namespace)
24
25 namespace LIBC_NAMESPACE_DECL {
26 namespace vdso {
27
28 enum class VDSOSym {
29 ClockGetTime,
30 ClockGetTime64,
31 GetTimeOfDay,
32 GetCpu,
33 Time,
34 ClockGetRes,
35 RTSigReturn,
36 FlushICache,
37 RiscvHwProbe,
38 VDSOSymCount
39 };
40
dispatcher()41 template <VDSOSym sym> LIBC_INLINE constexpr auto dispatcher() {
42 if constexpr (sym == VDSOSym::ClockGetTime)
43 return static_cast<int (*)(clockid_t, timespec *)>(nullptr);
44 else if constexpr (sym == VDSOSym::ClockGetTime64)
45 return static_cast<int (*)(clockid_t, __kernel_timespec *)>(nullptr);
46 else if constexpr (sym == VDSOSym::GetTimeOfDay)
47 return static_cast<int (*)(timeval *__restrict,
48 struct timezone *__restrict)>(nullptr);
49 else if constexpr (sym == VDSOSym::GetCpu)
50 return static_cast<int (*)(unsigned *, unsigned *, getcpu_cache *)>(
51 nullptr);
52 else if constexpr (sym == VDSOSym::Time)
53 return static_cast<time_t (*)(time_t *)>(nullptr);
54 else if constexpr (sym == VDSOSym::ClockGetRes)
55 return static_cast<int (*)(clockid_t, timespec *)>(nullptr);
56 else if constexpr (sym == VDSOSym::RTSigReturn)
57 return static_cast<void (*)(void)>(nullptr);
58 else if constexpr (sym == VDSOSym::FlushICache)
59 return static_cast<void (*)(void *, void *, unsigned int)>(nullptr);
60 else if constexpr (sym == VDSOSym::RiscvHwProbe)
61 return static_cast<int (*)(riscv_hwprobe *, size_t, size_t, cpu_set_t *,
62 unsigned)>(nullptr);
63 else
64 return static_cast<void *>(nullptr);
65 }
66
67 template <VDSOSym sym> using VDSOSymType = decltype(dispatcher<sym>());
68
69 } // namespace vdso
70 } // namespace LIBC_NAMESPACE_DECL
71