1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 Imagination Technologies
*
* 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; version 2 of the License.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
.set noreorder /* Prevent assembler from "optimizing" this code. */
.section ".start", "ax", %progbits
.globl _start
_start:
/* Set the stack pointer */
li $sp, CONFIG_BOOTBLOCK_STACK_TOP
/*
* Initialise the stack to a known value, used later to check for
* overflow.
*/
li $t0, CONFIG_BOOTBLOCK_STACK_BOTTOM
addi $t1, $sp, -4
li $t2, 0xdeadbeef
1: sw $t2, 0($t0)
bne $t0, $t1, 1b
addi $t0, $t0, 4
/* Run main */
b main
/*
* Should never return from main. Make sure there is no branch in the
* branch delay slot.
*/
2: nop
b 2b
nop /* Make sure there is no branch after this either. */
|
