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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/unicore32/kernel/debug.S
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/*

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 * linux/arch/unicore32/kernel/debug.S

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 *

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 * Code specific to PKUnity SoC and UniCore ISA

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 *

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 * Copyright (C) 2001-2010 GUAN Xue-tao

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 *

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

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 * it under the terms of the GNU General Public License version 2 as

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 * published by the Free Software Foundation.

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 *

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 *  32-bit debugging code

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 */

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#include <linux/linkage.h>

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#include <asm/assembler.h>

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		.text

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/*

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 * Some debugging routines (useful if you've got MM problems and

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 * printk isn't working).  For DEBUGGING ONLY!!!  Do not leave

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 * references to these in a production kernel!

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 */

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#include "debug-macro.S"

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/*

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 * Useful debugging routines

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 */

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ENTRY(printhex8)

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		mov	r1, #8

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		b	printhex

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ENDPROC(printhex8)

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ENTRY(printhex4)

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		mov	r1, #4

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		b	printhex

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ENDPROC(printhex4)

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ENTRY(printhex2)

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		mov	r1, #2

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printhex:	adr	r2, hexbuf

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		add	r3, r2, r1

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		mov	r1, #0

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		stb	r1, [r3]

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1:		and	r1, r0, #15

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		mov	r0, r0 >> #4

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		csub.a	r1, #10

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		beg	2f

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		add	r1, r1, #'0' - 'a' + 10

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2:		add	r1, r1, #'a' - 10

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		stb.w	r1, [r3+], #-1

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		cxor.a	r3, r2

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		bne	1b

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		mov	r0, r2

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		b	printascii

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ENDPROC(printhex2)

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		.ltorg

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ENTRY(printascii)

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		addruart r3

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		b	2f

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1:		waituart r2, r3

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		senduart r1, r3

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		busyuart r2, r3

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		cxor.a	r1, #'\n'

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		cmoveq	r1, #'\r'

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		beq	1b

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2:		cxor.a	r0, #0

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		beq	3f

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		ldb.w	r1, [r0]+, #1

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		cxor.a	r1, #0

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		bne	1b

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3:		mov	pc, lr

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ENDPROC(printascii)

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ENTRY(printch)

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		addruart r3

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		mov	r1, r0

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		mov	r0, #0

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		b	1b

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ENDPROC(printch)

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hexbuf:		.space 16

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