agb/crt0.s
2021-04-13 01:47:51 +01:00

32 lines
1.1 KiB
ArmAsm

.arm
.global __start
__start:
b .Initialise
@ Filled in by gbafix
.fill 188, 1, 0
.Initialise:
@ Set interrupt handler
ldr r0, =InterruptHandlerSimple
ldr r1, =0x03007FFC
str r0, [r1]
@ copies iwram section in rom to iwram in ram
ldr r0, =__iwram_rom_start @ load memory address storing start of data for iwram in rom
ldr r1, =__iwram_data_start @ load memory address storing location of iwram in ram
ldr r2, =__iwram_rom_length_halfwords @ load number of 16 bit values to copy
swi 0x000B0000 @ call interrupt CpuSet.
@ r0: source
@ r1: destination
@ r2: length + size information
@
@ see: https://mgba-emu.github.io/gbatek/#swi-0bh-gbands7nds9dsi7dsi9---cpuset
@ load main and branch
ldr r0, =main
bx r0
.include "interrupt_simple.s"