1/* 2 * Copyright (c) 1999-2016 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 29#include "SYS.h" 30 31/* 32 * A third argument, of type uint64_t*, was added to the gettimeofday syscall 33 * for use cases that also want to know the mach_absolute_time that matches the 34 * time value returned. 35 * 36 * __gettimeofday takes the traditional two arguments. It will zero out the 37 * third argument argument before entering the kernel, behaving like the old 38 * call. 39 * 40 * __gettimeofday_with_mach will pass it through and supporting kernels will 41 * copy-out the mach_absolute_time. Old kernels will leave the pointed to 42 * value alone. 43 */ 44 45.private_extern ___gettimeofday_with_mach 46 47#if defined(__i386__) 48 49LABEL(___gettimeofday) 50 pushl $0 51 pushl 12(%esp) 52 pushl 12(%esp) 53 calll ___gettimeofday_with_mach 54 addl $12, %esp 55 ret 56 57LABEL(___gettimeofday_with_mach) 58 UNIX_SYSCALL_INT_NONAME(gettimeofday,0) 59 /* 60 * <rdar://problem/26410029> 61 * If eax is 0, we're on a new kernel and timeval was written by the kernel. 62 * Otherwise, eax:edx contains the timeval and we marshal into timeval. 63 */ 64 cmp $0, %eax 65 je 2f 66 mov 4(%esp),%ecx 67 mov %eax,(%ecx) 68 mov %edx,4(%ecx) 69 xor %eax,%eax 702: 71 ret 72 73#elif defined(__x86_64__) 74 75__SYSCALL(___gettimeofday_with_mach, gettimeofday, 3) 76 77LABEL(___gettimeofday) 78 movq $0x0, %rdx // zero out third argument 79 80 UNIX_SYSCALL_NONAME(gettimeofday,0,cerror_nocancel) 81 /* 82 * <rdar://problem/26410029> 83 * If rax is 0, we're on a new kernel and timeval was written by the kernel. 84 * Otherwise, rax:rdx contains the timeval and we marshal into timeval. 85 */ 86 cmp $0, %rax 87 je 2f 88 movq %rax, (%rdi) 89 movl %edx, 8(%rdi) 90 xorl %eax, %eax 912: 92 ret 93 94#elif defined(__arm__) 95 96__SYSCALL2(___gettimeofday_with_mach, gettimeofday, 3, cerror_nocancel) 97 98.text 99.align 2 100.globl ___gettimeofday 101___gettimeofday: 102 mov r2, #0x0 103 SYSCALL_NONAME(gettimeofday, 3, cerror_nocancel) 104 bx lr 105 106#elif defined(__arm64__) 107 108__SYSCALL2(___gettimeofday_with_mach, gettimeofday, 3, cerror_nocancel) 109 110.text 111.align 2 112.globl ___gettimeofday 113___gettimeofday: 114 movz x2, #0x0 115 SYSCALL_NONAME(gettimeofday, 3, cerror_nocancel) 116 ret 117 118#else 119#error Unsupported architecture 120#endif 121