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

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#

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# MN10300 Low-level gdbstub routines

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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/cache.h>

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#include <asm/cpu-regs.h>

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#include <asm/exceptions.h>

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#include <asm/frame.inc>

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#include <asm/serial-regs.h>

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	.text

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

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#

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# GDB stub read memory with guard

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# - D0 holds the memory address to read

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# - D1 holds the address to store the byte into

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#

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

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	.globl gdbstub_read_byte_guard

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	.globl gdbstub_read_byte_cont

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ENTRY(gdbstub_read_byte)

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	mov	d0,a0

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	mov	d1,a1

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	clr	d0

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gdbstub_read_byte_guard:

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	movbu	(a0),d1

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gdbstub_read_byte_cont:

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	movbu	d1,(a1)

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	ret	[],0

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	.globl gdbstub_read_word_guard

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	.globl gdbstub_read_word_cont

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ENTRY(gdbstub_read_word)

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	mov	d0,a0

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	mov	d1,a1

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	clr	d0

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gdbstub_read_word_guard:

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	movhu	(a0),d1

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gdbstub_read_word_cont:

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	movhu	d1,(a1)

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	ret	[],0

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	.globl gdbstub_read_dword_guard

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	.globl gdbstub_read_dword_cont

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ENTRY(gdbstub_read_dword)

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	mov	d0,a0

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	mov	d1,a1

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	clr	d0

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gdbstub_read_dword_guard:

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	mov	(a0),d1

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gdbstub_read_dword_cont:

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	mov	d1,(a1)

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	ret	[],0

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

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#

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# GDB stub write memory with guard

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# - D0 holds the byte to store

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# - D1 holds the memory address to write

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#

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

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	.globl gdbstub_write_byte_guard

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	.globl gdbstub_write_byte_cont

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ENTRY(gdbstub_write_byte)

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	mov	d0,a0

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	mov	d1,a1

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	clr	d0

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gdbstub_write_byte_guard:

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	movbu	a0,(a1)

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gdbstub_write_byte_cont:

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	ret	[],0

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	.globl gdbstub_write_word_guard

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	.globl gdbstub_write_word_cont

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ENTRY(gdbstub_write_word)

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	mov	d0,a0

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	mov	d1,a1

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	clr	d0

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gdbstub_write_word_guard:

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	movhu	a0,(a1)

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gdbstub_write_word_cont:

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	ret	[],0

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	.globl gdbstub_write_dword_guard

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	.globl gdbstub_write_dword_cont

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ENTRY(gdbstub_write_dword)

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	mov	d0,a0

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	mov	d1,a1

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	clr	d0

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gdbstub_write_dword_guard:

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	mov	a0,(a1)

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gdbstub_write_dword_cont:

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	ret	[],0

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

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#

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# GDB stub BUG() trap

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#

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

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ENTRY(__gdbstub_bug_trap)

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	.byte	0xF7,0xF7	# don't use 0xFF as the JTAG unit preempts that

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	ret	[],0

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