/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8     -*-â
âvi: set et ft=asm ts=8 tw=8 fenc=utf-8                                     :viâ
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â Copyright 2022 Justine Alexandra Roberts Tunney                              â
â                                                                              â
â Permission to use, copy, modify, and/or distribute this software for         â
â any purpose with or without fee is hereby granted, provided that the         â
â above copyright notice and this permission notice appear in all copies.      â
â                                                                              â
â THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                â
â WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                â
â WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             â
â AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         â
â DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        â
â PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               â
â TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             â
â PERFORMANCE OF THIS SOFTWARE.                                                â
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#include "libc/macros.internal.h"
.text.windows

//	Used by clone() on Windows to launch thread.
//
//	Windows owns the stack memory when we initially enter threads.
//	This function switches us over, so that we can start using the
//	runtime facilities.
//
//	@param	%rdi is arg
//	@param	%rsi is tid
//	@param	%rdx is func
//	@param	%rcx is stack
//	@return	%rax is exit code
//	@see	clone()
WinThreadLaunch:
	push	%rbx
	push	%r15
	mov	%rbp,%r15
	mov	%rsp,%rbx
	mov	%rcx,%rsp
	xor	%rbp,%rbp
	call	*%rdx
	mov	%r15,%rbp
	mov	%rbx,%rsp
	pop	%r15
	pop	%rbx
	ret
	.endfn	WinThreadLaunch,globl,hidden
