.globl a_irq_handler
a_irq_handler:
    push {lr}
    bl disable_irq
    // r2 = CORE0_INTERRUPT_SOURCE
    // if r2 & 0b100000000
    mov r2, #0x40000000
    ldr r3, [r2, #0x60]
    tst r3, #256
    beq a_irq_handler.exit
    // r2 = IRQ_PEND2
    // r2 & 1 << 25
    mov r2, #0xB208
    movt r2, #0x3F00
    ldr r3, [r2]
    tst r3, #0x2000000
    beq a_irq_handler.exit
    mov r2, #0x1040
    movt r2, #0x3F20
    ldr r3, [r2]
    tst r3, #16
    beq a_irq_handler.exit
    mov r2, #0x1000
    movt r2, #0x3F20
    ldrb r0, [r2]
    push {r0}
    bl enable_irq
    pop {r0}
    bl uart_char
    ldr r0, =imsg
    bl uart_string
    pop {pc}
a_irq_handler.exit:
    bl enable_irq
    pop {pc}

.globl a_fiq_handler
a_fiq_handler:
    push {lr}
    bl disable_fiq
    ldr r0, =fmsg
    bl uart_string
a_fiq_handler.exit:
    bl enable_fiq
    pop {pc}

.section ".data"
imsg:
    .asciz " a_irq_handler\n"
fmsg:
    .asciz " a_fiq_handler\n"