55 lines
2.6 KiB
ArmAsm
55 lines
2.6 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/dce.h"
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#include "libc/macros.h"
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/ Returns system wall time in microseconds.
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/
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/ @param rdi points to timeval that receives result
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/ @param rsi receives UTC timezone if non-NULL
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/ @return always zero
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/ @see clock_gettime() for nanosecond precision
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/ @see strftime() for string formatting
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gettimeofday$sysv:
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push %rbp
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mov %rsp,%rbp
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.profilable
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test %rsi,%rsi
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jz 1f
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push $0
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pop (%rsi)
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1: xor %esi,%esi # no one zones this way.
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xor %edx,%edx # i64*mach_absolute_time
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call __gettimeofday$sysv
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#if SupportsXnu()
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testb IsXnu() # XNU might do %rax:%rdx
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jz 1f
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test %rdi,%rdi
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jz 1f
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test %rax,%rax
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jz 1f
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mov %rax,(%rdi)
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mov %rdx,8(%rdi)
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#endif
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1: xor %eax,%eax # nevar fail
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pop %rbp
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ret
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.endfn gettimeofday$sysv,globl,hidden
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