path: root/arch/arm/kernel/entry-armv.S

/*
 *  linux/arch/arm/kernel/entry-armv.S
 *
 *  Copyright (C) 1996,1997,1998 Russell King.
 *  ARM700 fix by Matthew Godbolt (linux-user@willothewisp.demon.co.uk)
 *  nommu support by Hyok S. Choi (hyok.choi@samsung.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  Low-level vector interface routines
 *
 *  Note:  there is a StrongARM bug in the STMIA rn, {regs}^ instruction
 *  that causes it to save wrong values...  Be aware!
 */

#include <asm/memory.h>
#include <asm/glue-df.h>
#include <asm/glue-pf.h>
#include <asm/vfpmacros.h>
#include <mach/entry-macro.S>
#include <asm/thread_notify.h>
#include <asm/unwind.h>
#include <asm/unistd.h>
#include <asm/tls.h>
#include <asm/system.h>

#include "entry-header.S"
#include <asm/entry-macro-multi.S>

/*
 * Interrupt handling.
 */
	.macro	irq_handler
#ifdef CONFIG_MULTI_IRQ_HANDLER
	ldr	r1, =handle_arch_irq
	mov	r0, sp
	adr	lr, BSYM(9997f)
	ldr	pc, [r1]
#else
	arch_irq_handler_default
#endif
9997:
	.endm

	.macro	pabt_helper
	@ PABORT handler takes pt_regs in r2, fault address in r4 and psr in r5
#ifdef MULTI_PABORT
	ldr	ip, .LCprocfns
	mov	lr, pc
	ldr	pc, [ip, #PROCESSOR_PABT_FUNC]
#else
	bl	CPU_PABORT_HANDLER
#endif
	.endm

	.macro	dabt_helper

	@
	@ Call the processor-specific abort handler:
	@
	@  r2 - pt_regs
	@  r4 - aborted context pc
	@  r5 - aborted context psr
	@
	@ The abort handler must return the aborted address in r0, and
	@ the fault status register in r1.  r9 must be preserved.
	@
#ifdef MULTI_DABORT
	ldr	ip, .LCprocfns
	mov	lr, pc
	ldr	pc, [ip, #PROCESSOR_DABT_FUNC]
#else
	bl	CPU_DABORT_HANDLER
#endif
	.endm

#ifdef CONFIG_KPROBES
	.section	.kprobes.text,"ax",%progbits
#else
	.text
#endif

/*
 * Invalid mode handlers
 */
	.macro	inv_entry, reason
	sub	sp, sp, #S_FRAME_SIZE
 ARM(	stmib	sp, {r1 - lr}		)
 THUMB(	stmia	sp, {r0 - r12}		)
 THUMB(	str	sp, [sp, #S_SP]		)
 THUMB(	str	lr, [sp, #S_LR]		)
	mov	r1, #\reason
	.endm

__pabt_invalid:
	inv_entry BAD_PREFETCH
	b	common_invalid
ENDPROC(__pabt_invalid)

__dabt_invalid:
	inv_entry BAD_DATA
	b	common_invalid
ENDPROC(__dabt_invalid)

__irq_invalid:
	inv_entry BAD_IRQ
	b	common_invalid
ENDPROC(__irq_invalid)

__und_invalid:
	inv_entry BAD_UNDEFINSTR

	@
	@ XXX fall through to common_invalid
	@

@
@ common_invalid - generic code for failed exception (re-entrant version of handlers)
@
common_invalid:
	zero_fp

	ldmia	r0, {r4 - r6}
	add	r0, sp, #S_PC		@ here for interlock avoidance
	mov	r7, #-1			@  ""   ""    ""        ""
	str	r4, [sp]		@ save preserved r0
	stmia	r0, {r5 - r7}		@ lr_<exception>,
					@ cpsr_<exception>, "old_r0"

	mov	r0, sp
	b	bad_mode
ENDPROC(__und_invalid)

/*
 * SVC mode handlers
 */

#if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
#define SPFIX(code...) code
#else
#define SPFIX(code...)
#endif

	.macro