mirror of
https://github.com/CTCaer/hekate.git
synced 2024-12-28 19:06:01 +00:00
0462f3b252
This adds support for exception handling. It should provide simple and fast reporting of crucial info and full restoration without powering off.
77 lines
1.7 KiB
ArmAsm
77 lines
1.7 KiB
ArmAsm
/*
|
|
* Copyright (c) 2018 naehrwert
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
.section .text._start
|
|
.arm
|
|
|
|
.extern _reloc_ipl
|
|
.type _reloc_ipl, %function
|
|
|
|
.extern memset
|
|
.type memset, %function
|
|
|
|
.extern _irq_setup
|
|
.type _irq_setup, %function
|
|
|
|
.globl _start
|
|
.type _start, %function
|
|
_start:
|
|
ADR R0, _start
|
|
LDR R1, =__ipl_start
|
|
CMP R0, R1
|
|
BEQ _real_start
|
|
|
|
/* If we are not in the right location already, copy a relocator to upper IRAM. */
|
|
ADR R2, _reloc_ipl
|
|
LDR R3, =0x4003FF00
|
|
MOV R4, #(_real_start - _reloc_ipl)
|
|
_copy_loop:
|
|
LDMIA R2!, {R5}
|
|
STMIA R3!, {R5}
|
|
SUBS R4, #4
|
|
BNE _copy_loop
|
|
|
|
/* Use the relocator to copy ourselves into the right place. */
|
|
LDR R2, =__ipl_end
|
|
SUB R2, R2, R1
|
|
LDR R3, =_real_start
|
|
LDR R4, =0x4003FF00
|
|
BX R4
|
|
|
|
_reloc_ipl:
|
|
LDMIA R0!, {R4-R7}
|
|
STMIA R1!, {R4-R7}
|
|
SUBS R2, #0x10
|
|
BNE _reloc_ipl
|
|
/* Jump to the relocated entry. */
|
|
BX R3
|
|
|
|
_real_start:
|
|
/* Initially, we place our stack in IRAM but will move it to SDRAM later. */
|
|
LDR SP, =0x4003FF00
|
|
LDR R0, =__bss_start
|
|
EOR R1, R1, R1
|
|
LDR R2, =__bss_end
|
|
SUB R2, R2, R0
|
|
BL memset
|
|
BL _irq_setup
|
|
B .
|
|
|
|
.globl pivot_stack
|
|
.type pivot_stack, %function
|
|
pivot_stack:
|
|
MOV SP, R0
|
|
BX LR
|