summaryrefslogtreecommitdiffstats
path: root/arch/arm/kernel/debug.S
blob: b9f94e03d916a9919654ce87284f451e7ee2c488 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
/*
 *  linux/arch/arm/kernel/debug.S
 *
 *  Copyright (C) 1994-1999 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  32-bit debugging code
 */
#include <linux/linkage.h>
#include <asm/assembler.h>

		.text

/*
 * Some debugging routines (useful if you've got MM problems and
 * printk isn't working).  For DEBUGGING ONLY!!!  Do not leave
 * references to these in a production kernel!
 */

#if !defined(CONFIG_DEBUG_SEMIHOSTING)
#include CONFIG_DEBUG_LL_INCLUDE
#endif

#ifdef CONFIG_MMU
		.macro	addruart_current, rx, tmp1, tmp2
		addruart	\tmp1, \tmp2, \rx
		mrc		p15, 0, \rx, c1, c0
		tst		\rx, #1
		moveq		\rx, \tmp1
		movne		\rx, \tmp2
		.endm

#else /* !CONFIG_MMU */
		.macro	addruart_current, rx, tmp1, tmp2
		addruart	\rx, \tmp1, \tmp2
		.endm

#endif /* CONFIG_MMU */

/*
 * Useful debugging routines
 */
ENTRY(printhex8)
		mov	r1, #8
		b	printhex
ENDPROC(printhex8)

ENTRY(printhex4)
		mov	r1, #4
		b	printhex
ENDPROC(printhex4)

ENTRY(printhex2)
		mov	r1, #2
printhex:	adr	r2, hexbuf_rel
		ldr	r3, [r2]
		add	r2, r2, r3
		add	r3, r2, r1
		mov	r1, #0
		strb	r1, [r3]
1:		and	r1, r0, #15
		mov	r0, r0, lsr #4
		cmp	r1, #10
		addlt	r1, r1, #'0'
		addge	r1, r1, #'a' - 10
		strb	r1, [r3, #-1]!
		teq	r3, r2
		bne	1b
		mov	r0, r2
		b	printascii
ENDPROC(printhex2)

		.pushsection .bss
hexbuf_addr:	.space 16
		.popsection
		.align
hexbuf_rel:	.long	hexbuf_addr - .

		.ltorg

#ifndef CONFIG_DEBUG_SEMIHOSTING

ENTRY(printascii)
		addruart_current r3, r1, r2
1:		teq	r0, #0
		ldrbne	r1, [r0], #1
		teqne	r1, #0
		reteq	lr
2:		teq     r1, #'\n'
		bne	3f
		mov	r1, #'\r'
		waituart r2, r3
		senduart r1, r3
		busyuart r2, r3
		mov	r1, #'\n'
3:		waituart r2, r3
		senduart r1, r3
		busyuart r2, r3
		b	1b
ENDPROC(printascii)

ENTRY(printch)
		addruart_current r3, r1, r2
		mov	r1, r0
		mov	r0, #0
		b	2b
ENDPROC(printch)

#ifdef CONFIG_MMU
ENTRY(debug_ll_addr)
		addruart r2, r3, ip
		str	r2, [r0]
		str	r3, [r1]
		ret	lr
ENDPROC(debug_ll_addr)
#endif

#else

ENTRY(printascii)
		mov	r1, r0
		mov	r0, #0x04		@ SYS_WRITE0
	ARM(	svc	#0x123456	)
#ifdef CONFIG_CPU_V7M
	THUMB(	bkpt	#0xab		)
#else
	THUMB(	svc	#0xab		)
#endif
		ret	lr
ENDPROC(printascii)

ENTRY(printch)
		adr	r1, hexbuf_rel
		ldr	r2, [r1]
		add	r1, r1, r2
		strb	r0, [r1]
		mov	r0, #0x03		@ SYS_WRITEC
	ARM(	svc	#0x123456	)
#ifdef CONFIG_CPU_V7M
	THUMB(	bkpt	#0xab		)
#else
	THUMB(	svc	#0xab		)
#endif
		ret	lr
ENDPROC(printch)

ENTRY(debug_ll_addr)
		mov	r2, #0
		str	r2, [r0]
		str	r2, [r1]
		ret	lr
ENDPROC(debug_ll_addr)

#endif