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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/mn10300/kernel/profile-low.S
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###############################################################################

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#

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# Fast profiling interrupt handler

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#

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# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.

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# Written by David Howells ([email protected])

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#

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# This program is free software; you can redistribute it and/or

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# modify it under the terms of the GNU General Public Licence

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# as published by the Free Software Foundation; either version

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# 2 of the Licence, or (at your option) any later version.

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#

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###############################################################################

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#include <linux/sys.h>

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#include <linux/linkage.h>

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#include <asm/segment.h>

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#include <asm/smp.h>

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#include <asm/intctl-regs.h>

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#include <asm/timer-regs.h>

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#define pi break

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	.balign	4

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counter:

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	.long	-1

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###############################################################################

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#

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# Profiling interrupt entry point

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# - intended to run at interrupt priority 1

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#

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###############################################################################

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ENTRY(profile_handler)

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	movm	[d2,d3,a2],(sp)

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	# ignore userspace

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	mov	(12,sp),d2

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	and	EPSW_nSL,d2

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	bne	out

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	# do nothing if there's no buffer

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	mov	(prof_buffer),a2

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	and	a2,a2

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	beq	out

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	or	0x20000000,a2

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	# calculate relative position in text segment

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	mov	(16,sp),d2

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	sub	_stext,d2

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	mov	(prof_shift),d3

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	lsr	d3,d2

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	mov	(prof_len),d3

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	cmp	d3,d2

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	bcc	outside_text

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	# increment the appropriate profile bucket

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do_inc:

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	asl2	d2

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	mov	(a2,d2),d3

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	inc	d3

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	mov	d3,(a2,d2)

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out:

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	mov	GxICR_DETECT,d2

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	movbu	d2,(TM11ICR)		# ACK the interrupt

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	movbu	(TM11ICR),d2

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	movm	(sp),[d2,d3,a2]

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	rti

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outside_text:

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	sub	1,d3

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	mov	d3,d2

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	bra	do_inc

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