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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/arm/kernel/debug.S
10817 views
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/*

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

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 *

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 *  Copyright (C) 1994-1999 Russell King

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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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		.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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#if defined(CONFIG_DEBUG_ICEDCC)

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		@@ debug using ARM EmbeddedICE DCC channel

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		.macro	addruart, rp, rv

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		.endm

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#if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7)

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		.macro	senduart, rd, rx

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		mcr	p14, 0, \rd, c0, c5, 0

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		.endm

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		.macro	busyuart, rd, rx

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1001:

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		mrc	p14, 0, \rx, c0, c1, 0

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		tst	\rx, #0x20000000

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		beq	1001b

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		.endm

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		.macro	waituart, rd, rx

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		mov	\rd, #0x2000000

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1001:

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		subs	\rd, \rd, #1

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		bmi	1002f

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		mrc	p14, 0, \rx, c0, c1, 0

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		tst	\rx, #0x20000000

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		bne	1001b

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1002:

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		.endm

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#elif defined(CONFIG_CPU_XSCALE)

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		.macro	senduart, rd, rx

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		mcr	p14, 0, \rd, c8, c0, 0

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		.endm

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		.macro	busyuart, rd, rx

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1001:

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		mrc	p14, 0, \rx, c14, c0, 0

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		tst	\rx, #0x10000000

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		beq	1001b

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		.endm

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		.macro	waituart, rd, rx

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		mov	\rd, #0x10000000

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1001:

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		subs	\rd, \rd, #1

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		bmi	1002f

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		mrc	p14, 0, \rx, c14, c0, 0

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		tst	\rx, #0x10000000

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		bne	1001b

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1002:

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		.endm

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#else

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		.macro	senduart, rd, rx

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		mcr	p14, 0, \rd, c1, c0, 0

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		.endm

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		.macro	busyuart, rd, rx

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1001:

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		mrc	p14, 0, \rx, c0, c0, 0

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		tst	\rx, #2

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		beq	1001b

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		.endm

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		.macro	waituart, rd, rx

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		mov	\rd, #0x2000000

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1001:

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		subs	\rd, \rd, #1

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		bmi	1002f

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		mrc	p14, 0, \rx, c0, c0, 0

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		tst	\rx, #2

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		bne	1001b

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1002:

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		.endm

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#endif	/* CONFIG_CPU_V6 */

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#else

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#include <mach/debug-macro.S>

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#endif	/* CONFIG_DEBUG_ICEDCC */

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#ifdef CONFIG_MMU

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		.macro	addruart_current, rx, tmp1, tmp2

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		addruart	\tmp1, \tmp2

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		mrc		p15, 0, \rx, c1, c0

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		tst		\rx, #1

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		moveq		\rx, \tmp1

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		movne		\rx, \tmp2

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		.endm

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#else /* !CONFIG_MMU */

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		.macro	addruart_current, rx, tmp1, tmp2

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		addruart	\rx, \tmp1

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		.endm

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#endif /* CONFIG_MMU */

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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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		strb	r1, [r3]

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1:		and	r1, r0, #15

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		mov	r0, r0, lsr #4

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		cmp	r1, #10

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		addlt	r1, r1, #'0'

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		addge	r1, r1, #'a' - 10

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		strb	r1, [r3, #-1]!

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		teq	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_current r3, r1, r2

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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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		teq	r1, #'\n'

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		moveq	r1, #'\r'

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		beq	1b

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2:		teq	r0, #0

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		ldrneb	r1, [r0], #1

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		teqne	r1, #0

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		bne	1b

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		mov	pc, lr

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ENDPROC(printascii)

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ENTRY(printch)

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		addruart_current r3, r1, r2

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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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