2 * (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
3 * (C) Copyright 2011, Julius Baxter <julius@opencores.org>
5 * SPDX-License-Identifier: GPL-2.0+
9 #include <asm-offsets.h>
10 #include <asm/spr-defs.h>
12 #define EXCEPTION_STACK_SIZE (128+128)
14 #define HANDLE_EXCEPTION \
15 l.addi r1, r1, -EXCEPTION_STACK_SIZE ;\
18 l.movhi r2,hi(_exception_handler) ;\
19 l.ori r2,r2,lo(_exception_handler) ;\
23 l.addi r1, r1, EXCEPTION_STACK_SIZE ;\
27 .section .vectors, "ax"
33 /* there is no guarantee r0 is hardwired to zero, clear it here */
35 /* reset stack and frame pointers */
39 /* set supervisor mode */
44 l.movhi r3,hi(__start) /* source start address */
45 l.ori r3,r3,lo(__start)
46 l.movhi r4,hi(_stext) /* dest start address */
47 l.ori r4,r4,lo(_stext)
48 l.movhi r5,hi(__end) /* dest end address */
57 l.addi r4,r4,4 /* delay slot */
59 #ifdef CONFIG_SYS_RELOCATE_VECTORS
60 /* Relocate vectors from 0xf0000000 to 0x00000000 */
61 l.movhi r4, 0xf000 /* source */
62 l.movhi r5, 0 /* destination */
63 l.addi r6, r5, CONFIG_SYS_VECTORS_LEN /* length */
73 l.ori r4,r4,lo(_start)
85 /* instruction page fault */
97 /* illegal instruction */
101 /* external interrupt */
193 /* Startup routine */
197 /* Init stack and frame pointers */
198 l.movhi r1, hi(CONFIG_SYS_INIT_SP_ADDR)
199 l.ori r1, r1, lo(CONFIG_SYS_INIT_SP_ADDR)
202 /* clear BSS segments */
203 l.movhi r4, hi(_bss_start)
204 l.ori r4, r4, lo(_bss_start)
205 l.movhi r5, hi(_bss_end)
206 l.ori r5, r5, lo(_bss_end)
213 /* Reset registers before jumping to board_init */
246 .size _start, .-_start
249 * Store state onto stack and call the real exception handler
252 .extern exception_handler
253 .type _exception_handler,@function
256 /* Store state (r2 and r9 already saved)*/
286 /* Save return address */
288 /* Call exception handler with the link address as argument */
289 l.jal exception_handler
291 /* Load return address */