/* kernel_thread.S: kernel thread creation * * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/linkage.h>#include <asm/unistd.h> #define CLONE_VM	0x00000100	/* set if VM shared between processes */#define	KERN_ERR	"<3>" 	.section .rodatakernel_thread_emsg:	.asciz	KERN_ERR "failed to create kernel thread: error=%d\n" 	.text	.balign		4 ################################################################################# Create a kernel thread## int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)################################################################################	.globl		kernel_thread	.type		kernel_thread,@functionkernel_thread:	or.p		gr8,gr0,gr4	or		gr9,gr0,gr5 	# start by forking the current process, but with shared VM	setlos.p	#__NR_clone,gr7		; syscall number	ori		gr10,#CLONE_VM,gr8	; first syscall arg	[clone_flags]	sethi.p		#0xe4e4,gr9		; second syscall arg	[newsp]	setlo		#0xe4e4,gr9	setlos.p	#0,gr10			; third syscall arg	[parent_tidptr]	setlos		#0,gr11			; fourth syscall arg	[child_tidptr]	tira		gr0,#0	setlos.p	#4095,gr7	andcc		gr8,gr8,gr0,icc0	addcc.p		gr8,gr7,gr0,icc1	bnelr		icc0,#2	bc		icc1,#0,kernel_thread_error 	# now invoke the work function	or		gr5,gr0,gr8	calll		@(gr4,gr0) 	# and finally exit the thread	setlos		#__NR_exit,gr7		; syscall number	tira		gr0,#0 kernel_thread_error:	subi		sp,#8,sp	movsg		lr,gr4	sti		gr8,@(sp,#0)	sti.p		gr4,@(sp,#4) 	or		gr8,gr0,gr9	sethi.p		%hi(kernel_thread_emsg),gr8	setlo		%lo(kernel_thread_emsg),gr8 	call		printk 	ldi		@(sp,#4),gr4	ldi		@(sp,#0),gr8	subi		sp,#8,sp	jmpl		@(gr4,gr0) 	.size		kernel_thread,.-kernel_thread