Skip to content
Snippets Groups Projects
start.S 1.74 KiB
Newer Older
  • Learn to ignore specific revisions
  • /*
     * (C) Copyright 2007
     * Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
     *
     * (C) Copyright 2007
     * Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
     *
     * 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.
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU General Public License for more details.
     *
     * You should have received a copy of the GNU General Public License
     * along with this program; if not, write to the Free Software
     * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
     * MA 02111-1307 USA
     */
    
    #include <config.h>
    #include <version.h>
    
    	.text
    	.align	2
    
    	.global	_start
    _start:
    	mov.l	._lowlevel_init, r0
    100:	bsrf	r0
    	nop
    
    	bsr	1f
    	nop
    1:	sts	pr, r5
    	mov.l	._reloc_dst, r4
    	add	#(_start-1b), r5
    	mov.l	._reloc_dst_end, r6
    
    2:	mov.l	@r5+, r1
    	mov.l	r1, @r4
    	add	#4, r4
    	cmp/hs	r6, r4
    	bf	2b
    
    	mov.l	._bss_start, r4
    	mov.l	._bss_end, r5
    	mov	#0, r1
    
    3:	mov.l	r1, @r4			/* bss clear */
    	add	#4, r4
    	cmp/hs	r5, r4
    	bf	3b
    
    	mov.l	._gd_init, r13		/* global data */
    	mov.l	._stack_init, r15	/* stack */
    
    	mov.l	._sh_generic_init, r0
    	jsr	@r0
    	nop
    
    loop:
    	bra	loop
    
    	.align	2
    
    ._lowlevel_init:	.long	(lowlevel_init - (100b + 4))
    ._reloc_dst:		.long	reloc_dst
    ._reloc_dst_end:	.long	reloc_dst_end
    ._bss_start:		.long	bss_start
    ._bss_end:		.long	bss_end
    ._gd_init:		.long	(_start - CFG_GBL_DATA_SIZE)
    ._stack_init:	.long	(_start - CFG_GBL_DATA_SIZE - CFG_MALLOC_LEN - 16)
    ._sh_generic_init:	.long	sh_generic_init