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

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#

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# MN10300 On-chip serial Rx interrupt handler for GDB stub I/O

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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/smp.h>

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#include <asm/thread_info.h>

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#include <asm/cpu-regs.h>

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#include <asm/frame.inc>

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#include <asm/intctl-regs.h>

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#include <unit/serial.h>

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#include "mn10300-serial.h"

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	.text

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

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#

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# GDB stub serial receive interrupt entry point

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# - intended to run at interrupt priority 0

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#

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

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	.globl	gdbstub_io_rx_handler

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	.type	gdbstub_io_rx_handler,@function

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gdbstub_io_rx_handler:

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	movm	[d2,d3,a2,a3],(sp)

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	mov	(gdbstub_rx_inp),a3

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gdbstub_io_rx_more:

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	mov	a3,a2

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	add	2,a3

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	and	PAGE_SIZE_asm-1,a3

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	mov	(gdbstub_rx_outp),d3

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	cmp	a3,d3

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	beq	gdbstub_io_rx_overflow

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	movbu	(SCgSTR),d3

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	btst	SC01STR_RBF,d3

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	beq	gdbstub_io_rx_done

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	movbu	(SCgRXB),d2

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	movbu	d3,(gdbstub_rx_buffer+1,a2)

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	movbu	d2,(gdbstub_rx_buffer,a2)

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	mov	a3,(gdbstub_rx_inp)

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	bra	gdbstub_io_rx_more

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gdbstub_io_rx_done:

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	mov	GxICR_DETECT,d2

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	movbu	d2,(GxICR(SCgRXIRQ))	# ACK the interrupt

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	movhu	(GxICR(SCgRXIRQ)),d2	# flush

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	movm	(sp),[d2,d3,a2,a3]

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	bset	0x01,(gdbstub_busy)

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	beq	gdbstub_io_rx_enter

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	rti

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gdbstub_io_rx_overflow:

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	bset	0x01,(gdbstub_rx_overflow)

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	bra	gdbstub_io_rx_done

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

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#

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# debugging interrupt - enter the GDB stub proper

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#

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

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gdbstub_io_rx_enter:

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	or	EPSW_IE|EPSW_IM_1,epsw

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	add	-4,sp

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	SAVE_ALL

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	mov	0xffffffff,d0

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	mov	d0,(REG_ORIG_D0,fp)

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	mov	0x280,d1

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	mov	fp,d0

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	call	gdbstub_rx_irq[],0	# gdbstub_io_rx_irq(regs,excep)

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	and	~EPSW_IE,epsw

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	bclr	0x01,(gdbstub_busy)

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	.globl gdbstub_return

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gdbstub_return:

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	RESTORE_ALL

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	.size	gdbstub_io_rx_handler,.-gdbstub_io_rx_handler

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