crt.s

/*
 * Copyright (c) 2020 Brian Callahan <bcallah@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

	.section ".note.openbsd.ident", "a"
	.p2align 2
	.long	0x8
	.long	0x4
	.long	0x1
	.asciz	"OpenBSD"
	.long	0x0

	.text
	.globl	_start
_start:
	callq	main
	movl	$1, %eax
	xorl	%edi, %edi
	syscall
	.size	_start,.-_start

	.globl	_syscall
_syscall:
	movq	%rdi, %rax
	movq	%rsi, %rdi
	movq	%rdx, %rsi
	movq	%rcx, %rdx
	movq	%r8, %rcx
	movq	%r9, %r8
	syscall
	retq
	.size	_syscall,.-_syscall