diff options
| author | Nobuhiro Iwamatsu <iwamatsu@rahute.(none)> | 2007-05-13 20:58:00 +0900 |
|---|---|---|
| committer | Nobuhiro Iwamatsu <iwamatsu@rahute.(none)> | 2007-05-13 20:58:00 +0900 |
| commit | 0b135cfc2e524dc249b75057b55dd4cc09842e27 (patch) | |
| tree | a342e571738e4777bbb2b66246412e9d9aaa81c2 /cpu/sh4/start.S | |
| parent | abca901869c3760b6c5fecb825db6c1d91a78a93 (diff) | |
sh: First support code of SuperH.
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Diffstat (limited to 'cpu/sh4/start.S')
| -rw-r--r-- | cpu/sh4/start.S | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/cpu/sh4/start.S b/cpu/sh4/start.S new file mode 100644 index 0000000000..d88b705ef0 --- /dev/null +++ b/cpu/sh4/start.S @@ -0,0 +1,75 @@ +/* + * (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 + |