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Atmosphere/fusee/fusee-primary/fusee-primary-main/src/reboot_start.s

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/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* 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/>.
*/
.macro CLEAR_GPR_REG_ITER
mov r\@, #0
.endm
.section .reboot.start, "ax", %progbits
.arm
.align 5
.global reboot_start
.type reboot_start, %function
reboot_start:
/* Switch to system mode, mask all interrupts, clear all flags */
msr cpsr_cxsf, #0xDF
/* Relocate reboot start to 0x4003E000. */
ldr r0, =0x4003E000
adr r1, reboot_start
cmp r0, r1
beq 1f
mov r2, #0x1000
0:
ldmia r1!, {r5-r12}
stmia r0!, {r5-r12}
subs r2, #0x20
bne 0b
ldr r0, =0x4003E000
adr r1, reboot_start
adr r2, 1f
sub r2, r2, r1
add r2, r2, r0
bx r2
1:
/* Restore our low iram code. */
ldr r0, =0x40008000
ldr r1, =0x40030000
mov r2, #0x8000
0:
ldmia r1!, {r5-r12}
stmia r0!, {r5-r12}
subs r2, #0x20
bne 0b
/* Restore our upper stub code. */
ldr r0, =0x40010000
ldr r1, =0x4003D000
mov r2, #0x1000
0:
ldmia r1!, {r5-r12}
stmia r0!, {r5-r12}
subs r2, #0x20
bne 0b
/* Jump to start. */
ldr r0, =0x40008000
bx r0
0: b 0b