2 * (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
3 * (C) Copyright 2011, Julius Baxter <julius@opencores.org>
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of
8 * the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22 #include <asm-offsets.h>
23 #include <asm/spr-defs.h>
25 #define EXCEPTION_STACK_SIZE (128+128)
27 #define HANDLE_EXCEPTION \
28 l.addi r1, r1, -EXCEPTION_STACK_SIZE ;\
30 l.jal _exception_handler ;\
33 l.addi r1, r1, EXCEPTION_STACK_SIZE ;\
37 .section .vectors, "ax"
43 /* there is no guarantee r0 is hardwired to zero, clear it here */
45 /* reset stack and frame pointers */
49 /* set supervisor mode */
54 l.movhi r3,hi(__start) /* source start address */
55 l.ori r3,r3,lo(__start)
56 l.movhi r4,hi(_stext) /* dest start address */
57 l.ori r4,r4,lo(_stext)
58 l.movhi r5,hi(__end) /* dest end address */
67 l.addi r4,r4,4 /* delay slot */
69 #ifdef CONFIG_SYS_RELOCATE_VECTORS
70 /* Relocate vectors from 0xf0000000 to 0x00000000 */
71 l.movhi r4, 0xf000 /* source */
72 l.movhi r5, 0 /* destination */
73 l.addi r6, r5, CONFIG_SYS_VECTORS_LEN /* length */
94 /* instruction page fault */
106 /* illegal instruction */
110 /* external interrupt */
202 /* Startup routine */
206 /* Init stack and frame pointers */
207 l.movhi r1, hi(CONFIG_SYS_INIT_SP_ADDR)
208 l.ori r1, r1, lo(CONFIG_SYS_INIT_SP_ADDR)
211 /* clear BSS segments */
212 l.movhi r4, hi(_bss_start)
213 l.ori r4, r4, lo(_bss_start)
214 l.movhi r5, hi(_bss_end)
215 l.ori r5, r5, lo(_bss_end)
222 /* Reset registers before jumping to board_init */
255 .size _start, .-_start
258 * Store state onto stack and call the real exception handler
261 .extern exception_handler
262 .type _exception_handler,@function
265 /* Store state (r9 already saved)*/
296 /* Save return address */
298 /* Call exception handler with the link address as argument */
299 l.jal exception_handler
301 /* Load return address */