/*
* $Id: loader.S,v 1.3 2007/11/04 22:39:27 init Exp $
*/
/*
* FunnyOS loader
* for gxemul test arm machines.
*/
.text
.global _start
.global main
_start:
b _vector_reset /* reset */
bl _vector_undef /* undefined insn */
bl _vector_swi /* software intr handler */
bl _vector_dataabrt /* data abort */
bl _vector_prefabrt /* prefetch abort */
.word 0x00000000 /* [reserved] */
b _vector_irq /* IRQ */
bl _vector_fiq /* Fast Interrupt Request */
_vector_reset:
/*
* Will enter here just right after RESET.
* Set up stack and call main.
*/
/*
* Setup an IRQ stack
*/
/* switch into irq mode with interrupts disabled */
msr cpsr_c, #(0x12 | 0x80)
/* set sp (sp is banked) */
ldr sp, Airqstack
/*
* Setup system stack
*/
/* switch into system mode (interrupts turned off) */
msr cpsr_c, #(0x1f | 0x80)
/* set system stack pointer */
ldr sp, Asysstack
b main
/* NOTREACHED */
_vector_undef:
/* Undefined insn handler */
mov pc, r14
_vector_swi:
mov pc, r14
_vector_dataabrt:
/* XXX fatal */
nop
_vector_prefabrt:
nop
_vector_irq:
bl irq_trampoline
mrs r0, spsr
msr cpsr, r0
subs pc, r14, #4
_vector_fiq:
nop
/* last word of the physical memory */
Asysstack:
.word 0x01fffffc
Airqstack:
.word 0x01fff000