asm_vectors.s

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/* $Id: asm_vectors.S,v 1.1.4.2 2011/10/25 05:30:07 sadanan Exp $*/
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/**
* @file asm_vectors.s
*
* This file contains the initial vector table for the Cortex A9 processor
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver   Who     Date     Changes
* ----- ------- -------- ---------------------------------------------------
* 1.00a ecm/sdm 10/20/09 Initial version
* 3.05a sdm	02/02/12 Save lr when profiling is enabled
* </pre>
*
* @note
*
* None.
*
******************************************************************************/
.org 0
.text

.globl _boot
.globl _vector_table

.globl FIQInterrupt
.globl IRQInterrupt
.globl SWInterrupt
.globl DataAbortInterrupt
.globl PrefetchAbortInterrupt

.globl IRQHandler
.globl prof_pc

.section .vectors
_vector_table:
	B	_boot
	B	Undefined
	B	SVCHandler
	B	PrefetchAbortHandler
	B	DataAbortHandler
	NOP	/* Placeholder for address exception vector*/
	B	IRQHandler
	B	FIQHandler


IRQHandler:					/* IRQ vector handler */
	
	stmdb	sp!,{r0-r3,r12,lr}		/* state save from compiled code*/

#ifdef PROFILING
	ldr	r2, =prof_pc
	subs	r3, lr, #0
	str	r3, [r2]
#endif

	bl	IRQInterrupt			/* IRQ vector */

	ldmia	sp!,{r0-r3,r12,lr}		/* state restore from compiled code */

	subs	pc, lr, #4			/* adjust return */


FIQHandler:					/* FIQ vector handler */
	stmdb	sp!,{r0-r3,r12,lr}		/* state save from compiled code */

FIQLoop:
	bl	FIQInterrupt			/* FIQ vector */

	ldmia	sp!,{r0-r3,r12,lr}		/* state restore from compiled code */
	subs	pc, lr, #4			/* adjust return */


Undefined:					/* Undefined handler */
	stmdb	sp!,{r0-r3,r12,lr}		/* state save from compiled code */

	ldmia	sp!,{r0-r3,r12,lr}		/* state restore from compiled code */

	b	_prestart			

	movs	pc, lr


SVCHandler:					/* SWI handler */
	stmdb	sp!,{r0-r3,r12,lr}		/* state save from compiled code */

	tst	r0, #0x20			/* check the T bit */
	ldrneh	r0, [lr,#-2]			/* Thumb mode */
	bicne	r0, r0, #0xff00			/* Thumb mode */
	ldreq	r0, [lr,#-4]			/* ARM mode */
	biceq	r0, r0, #0xff000000		/* ARM mode */

	bl	SWInterrupt			/* SWInterrupt: call C function here */

	ldmia	sp!,{r0-r3,r12,lr}		/* state restore from compiled code */

	subs	pc, lr, #4			/* adjust return */


DataAbortHandler:				/* Data Abort handler */
	stmdb	sp!,{r0-r3,r12,lr}		/* state save from compiled code */

	bl	DataAbortInterrupt		/*DataAbortInterrupt :call C function here */

	ldmia	sp!,{r0-r3,r12,lr}		/* state restore from compiled code */

	subs	pc, lr, #4			/* adjust return */

PrefetchAbortHandler:				/* Prefetch Abort handler */
	stmdb	sp!,{r0-r3,r12,lr}		/* state save from compiled code */

	bl	PrefetchAbortInterrupt		/* PrefetchAbortInterrupt: call C function here */

	ldmia	sp!,{r0-r3,r12,lr}		/* state restore from compiled code */

	subs	pc, lr, #4			/* adjust return */


.end