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| 1 | // -*- C++ -*- |
|---|---|
| 2 | //===----------------------------------------------------------------------===// |
| 3 | // |
| 4 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 5 | // See https://llvm.org/LICENSE.txt for license information. |
| 6 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #ifndef _LIBCPP___CXX03___SUPPORT_IBM_GETTOD_ZOS_H |
| 11 | #define _LIBCPP___CXX03___SUPPORT_IBM_GETTOD_ZOS_H |
| 12 | |
| 13 | #include <__cxx03/time.h> |
| 14 | |
| 15 | inline _LIBCPP_HIDE_FROM_ABI int gettimeofdayMonotonic(struct timespec64* Output) { |
| 16 | // The POSIX gettimeofday() function is not available on z/OS. Therefore, |
| 17 | // we will call stcke and other hardware instructions in implement equivalent. |
| 18 | // Note that nanoseconds alone will overflow when reaching new epoch in 2042. |
| 19 | |
| 20 | struct _t { |
| 21 | uint64_t Hi; |
| 22 | uint64_t Lo; |
| 23 | }; |
| 24 | struct _t Value = {0, 0}; |
| 25 | uint64_t CC = 0; |
| 26 | asm(" stcke %0\n" |
| 27 | " ipm %1\n" |
| 28 | " srlg %1,%1,28\n" |
| 29 | : "=m"(Value), "+r"(CC)::); |
| 30 | |
| 31 | if (CC != 0) { |
| 32 | errno = EMVSTODNOTSET; |
| 33 | return CC; |
| 34 | } |
| 35 | uint64_t us = (Value.Hi >> 4); |
| 36 | uint64_t ns = ((Value.Hi & 0x0F) << 8) + (Value.Lo >> 56); |
| 37 | ns = (ns * 1000) >> 12; |
| 38 | us = us - 2208988800000000; |
| 39 | |
| 40 | register uint64_t DivPair0 asm("r0"); // dividend (upper half), remainder |
| 41 | DivPair0 = 0; |
| 42 | register uint64_t DivPair1 asm("r1"); // dividend (lower half), quotient |
| 43 | DivPair1 = us; |
| 44 | uint64_t Divisor = 1000000; |
| 45 | asm(" dlgr %0,%2" : "+r"(DivPair0), "+r"(DivPair1) : "r"(Divisor) :); |
| 46 | |
| 47 | Output->tv_sec = DivPair1; |
| 48 | Output->tv_nsec = DivPair0 * 1000 + ns; |
| 49 | return 0; |
| 50 | } |
| 51 | |
| 52 | #endif // _LIBCPP___CXX03___SUPPORT_IBM_GETTOD_ZOS_H |
| 53 |
Warning: This file is not a C or C++ file. It does not have highlighting.