mirror of
https://github.com/fail0verflow/mini.git
synced 2024-11-28 06:04:19 +01:00
cce6145e15
This reverts commit 189d9559aee8881aeb3df34817c28690bfaf5970. Loading mini from the installer makes mini panic, lets reintroduce a working version after the initial release.
129 lines
2.0 KiB
ArmAsm
129 lines
2.0 KiB
ArmAsm
/*
|
|
mini - a Free Software replacement for the Nintendo/BroadOn IOS.
|
|
system startup
|
|
|
|
Copyright (C) 2008, 2009 Hector Martin "marcan" <marcan@marcansoft.com>
|
|
|
|
# This code is licensed to you under the terms of the GNU GPL, version 2;
|
|
# see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
|
|
*/
|
|
|
|
.arm
|
|
|
|
.extern _main
|
|
.extern __got_start
|
|
.extern __got_end
|
|
.extern __bss_start
|
|
.extern __bss_end
|
|
.extern __bss2_start
|
|
.extern __bss2_end
|
|
.extern __stack_addr
|
|
.globl _start
|
|
.globl debug_output
|
|
|
|
.extern v_undf
|
|
.extern v_swi
|
|
.extern v_instr_abrt
|
|
.extern v_data_abrt
|
|
.extern v_reserved
|
|
.extern v_irq
|
|
.extern v_fiq
|
|
|
|
.section .init
|
|
|
|
_vectors:
|
|
_start:
|
|
ldr pc, =v_reset
|
|
ldr pc, =v_undf
|
|
ldr pc, =v_swi
|
|
ldr pc, =v_instr_abrt
|
|
ldr pc, =v_data_abrt
|
|
ldr pc, =v_reserved
|
|
ldr pc, =v_irq
|
|
ldr pc, =v_fiq
|
|
|
|
.pool
|
|
|
|
v_reset:
|
|
@ Switch to System mode
|
|
msr cpsr_c, #0xdf
|
|
|
|
@ Get loader base from ELF loader
|
|
mov r4, r0
|
|
|
|
@ Output 0x42 to the debug port
|
|
mov r0, #0x42
|
|
bl debug_output
|
|
|
|
@ Set up a stack
|
|
ldr sp, =__stack_addr
|
|
|
|
@ clear the stack to a marker value
|
|
ldr r1, =__stack_end
|
|
ldr r2, =__stack_addr
|
|
ldr r3, =0xDEADBEEF
|
|
stk_loop:
|
|
@ check for the end
|
|
cmp r1, r2
|
|
beq done_stk
|
|
@ clear the word and move on
|
|
str r3, [r1]
|
|
add r1, r1, #4
|
|
b stk_loop
|
|
|
|
done_stk:
|
|
@ clear BSS
|
|
ldr r1, =__bss_start
|
|
ldr r2, =__bss_end
|
|
mov r3, #0
|
|
bss_loop:
|
|
@ check for the end
|
|
cmp r1, r2
|
|
beq done_bss
|
|
@ clear the word and move on
|
|
str r3, [r1]
|
|
add r1, r1, #4
|
|
b bss_loop
|
|
|
|
done_bss:
|
|
@ clear BSS2
|
|
ldr r1, =__bss2_start
|
|
ldr r2, =__bss2_end
|
|
mov r3, #0
|
|
bss2_loop:
|
|
@ check for the end
|
|
cmp r1, r2
|
|
beq done_bss2
|
|
@ clear the word and move on
|
|
str r3, [r1]
|
|
add r1, r1, #4
|
|
b bss2_loop
|
|
|
|
done_bss2:
|
|
mov r0, #0x84
|
|
bl debug_output
|
|
@ take the plunge
|
|
mov r0, r4
|
|
bl _main
|
|
@ _main returned! Go to whatever address it returned...
|
|
mov pc, r0
|
|
|
|
.pool
|
|
|
|
debug_output:
|
|
@ load address of port
|
|
mov r3, #0xd800000
|
|
@ load old value
|
|
ldr r2, [r3, #0xe0]
|
|
@ clear debug byte
|
|
bic r2, r2, #0xFF0000
|
|
@ insert new value
|
|
and r0, r0, #0xFF
|
|
orr r2, r2, r0, LSL #16
|
|
@ store back
|
|
str r2, [r3, #0xe0]
|
|
bx lr
|
|
|
|
.pool
|
|
|