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	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
	49	LABEL(___gettimeofday)
	50	pushl $0
	51	pushl 12(%esp)
	52	pushl 12(%esp)
	53	calll ___gettimeofday_with_mach
	54	addl $12, %esp
	55	ret
	56
	57	LABEL(___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
	70	2:
	71	ret
	72
	73	#elif defined(__x86_64__)
	74
	75	__SYSCALL(___gettimeofday_with_mach, gettimeofday, 3)
	76
	77	LABEL(___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
	91	2:
	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