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1/*
2 * linux/arch/arm/kernel/debug.S
3 *
4 * Copyright (C) 1994-1999 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * 32-bit debugging code
11 */
12#include <linux/linkage.h>
13
14 .text
15
16/*
17 * Some debugging routines (useful if you've got MM problems and
18 * printk isn't working). For DEBUGGING ONLY!!! Do not leave
19 * references to these in a production kernel!
20 */
21
22#if defined(CONFIG_DEBUG_ICEDCC)
23 @@ debug using ARM EmbeddedICE DCC channel
24
25 .macro addruart, rp, rv
26 .endm
27
28#if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7)
29
30 .macro senduart, rd, rx
31 mcr p14, 0, \rd, c0, c5, 0
32 .endm
33
34 .macro busyuart, rd, rx
351001:
36 mrc p14, 0, \rx, c0, c1, 0
37 tst \rx, #0x20000000
38 beq 1001b
39 .endm
40
41 .macro waituart, rd, rx
42 mov \rd, #0x2000000
431001:
44 subs \rd, \rd, #1
45 bmi 1002f
46 mrc p14, 0, \rx, c0, c1, 0
47 tst \rx, #0x20000000
48 bne 1001b
491002:
50 .endm
51
52#elif defined(CONFIG_CPU_XSCALE)
53
54 .macro senduart, rd, rx
55 mcr p14, 0, \rd, c8, c0, 0
56 .endm
57
58 .macro busyuart, rd, rx
591001:
60 mrc p14, 0, \rx, c14, c0, 0
61 tst \rx, #0x10000000
62 beq 1001b
63 .endm
64
65 .macro waituart, rd, rx
66 mov \rd, #0x10000000
671001:
68 subs \rd, \rd, #1
69 bmi 1002f
70 mrc p14, 0, \rx, c14, c0, 0
71 tst \rx, #0x10000000
72 bne 1001b
731002:
74 .endm
75
76#else
77
78 .macro senduart, rd, rx
79 mcr p14, 0, \rd, c1, c0, 0
80 .endm
81
82 .macro busyuart, rd, rx
831001:
84 mrc p14, 0, \rx, c0, c0, 0
85 tst \rx, #2
86 beq 1001b
87
88 .endm
89
90 .macro waituart, rd, rx
91 mov \rd, #0x2000000
921001:
93 subs \rd, \rd, #1
94 bmi 1002f
95 mrc p14, 0, \rx, c0, c0, 0
96 tst \rx, #2
97 bne 1001b
981002:
99 .endm
100
101#endif /* CONFIG_CPU_V6 */
102
103#else
104#include <mach/debug-macro.S>
105#endif /* CONFIG_DEBUG_ICEDCC */
106
107#ifdef CONFIG_MMU
108 .macro addruart_current, rx, tmp1, tmp2
109 addruart \tmp1, \tmp2
110 mrc p15, 0, \rx, c1, c0
111 tst \rx, #1
112 moveq \rx, \tmp1
113 movne \rx, \tmp2
114 .endm
115
116#else /* !CONFIG_MMU */
117 .macro addruart_current, rx, tmp1, tmp2
118 addruart \rx, \tmp1
119 .endm
120
121#endif /* CONFIG_MMU */
122
123/*
124 * Useful debugging routines
125 */
126ENTRY(printhex8)
127 mov r1, #8
128 b printhex
129ENDPROC(printhex8)
130
131ENTRY(printhex4)
132 mov r1, #4
133 b printhex
134ENDPROC(printhex4)
135
136ENTRY(printhex2)
137 mov r1, #2
138printhex: adr r2, hexbuf
139 add r3, r2, r1
140 mov r1, #0
141 strb r1, [r3]
1421: and r1, r0, #15
143 mov r0, r0, lsr #4
144 cmp r1, #10
145 addlt r1, r1, #'0'
146 addge r1, r1, #'a' - 10
147 strb r1, [r3, #-1]!
148 teq r3, r2
149 bne 1b
150 mov r0, r2
151 b printascii
152ENDPROC(printhex2)
153
154 .ltorg
155
156ENTRY(printascii)
157 addruart_current r3, r1, r2
158 b 2f
1591: waituart r2, r3
160 senduart r1, r3
161 busyuart r2, r3
162 teq r1, #'\n'
163 moveq r1, #'\r'
164 beq 1b
1652: teq r0, #0
166 ldrneb r1, [r0], #1
167 teqne r1, #0
168 bne 1b
169 mov pc, lr
170ENDPROC(printascii)
171
172ENTRY(printch)
173 addruart_current r3, r1, r2
174 mov r1, r0
175 mov r0, #0
176 b 1b
177ENDPROC(printch)
178
179hexbuf: .space 16
1/*
2 * linux/arch/arm/kernel/debug.S
3 *
4 * Copyright (C) 1994-1999 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * 32-bit debugging code
11 */
12#include <linux/linkage.h>
13#include <asm/assembler.h>
14
15 .text
16
17/*
18 * Some debugging routines (useful if you've got MM problems and
19 * printk isn't working). For DEBUGGING ONLY!!! Do not leave
20 * references to these in a production kernel!
21 */
22
23#if defined(CONFIG_DEBUG_ICEDCC)
24 @@ debug using ARM EmbeddedICE DCC channel
25
26 .macro addruart, rp, rv, tmp
27 .endm
28
29#if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7)
30
31 .macro senduart, rd, rx
32 mcr p14, 0, \rd, c0, c5, 0
33 .endm
34
35 .macro busyuart, rd, rx
361001:
37 mrc p14, 0, \rx, c0, c1, 0
38 tst \rx, #0x20000000
39 beq 1001b
40 .endm
41
42 .macro waituart, rd, rx
43 mov \rd, #0x2000000
441001:
45 subs \rd, \rd, #1
46 bmi 1002f
47 mrc p14, 0, \rx, c0, c1, 0
48 tst \rx, #0x20000000
49 bne 1001b
501002:
51 .endm
52
53#elif defined(CONFIG_CPU_XSCALE)
54
55 .macro senduart, rd, rx
56 mcr p14, 0, \rd, c8, c0, 0
57 .endm
58
59 .macro busyuart, rd, rx
601001:
61 mrc p14, 0, \rx, c14, c0, 0
62 tst \rx, #0x10000000
63 beq 1001b
64 .endm
65
66 .macro waituart, rd, rx
67 mov \rd, #0x10000000
681001:
69 subs \rd, \rd, #1
70 bmi 1002f
71 mrc p14, 0, \rx, c14, c0, 0
72 tst \rx, #0x10000000
73 bne 1001b
741002:
75 .endm
76
77#else
78
79 .macro senduart, rd, rx
80 mcr p14, 0, \rd, c1, c0, 0
81 .endm
82
83 .macro busyuart, rd, rx
841001:
85 mrc p14, 0, \rx, c0, c0, 0
86 tst \rx, #2
87 beq 1001b
88
89 .endm
90
91 .macro waituart, rd, rx
92 mov \rd, #0x2000000
931001:
94 subs \rd, \rd, #1
95 bmi 1002f
96 mrc p14, 0, \rx, c0, c0, 0
97 tst \rx, #2
98 bne 1001b
991002:
100 .endm
101
102#endif /* CONFIG_CPU_V6 */
103
104#elif !defined(CONFIG_DEBUG_SEMIHOSTING)
105#include <mach/debug-macro.S>
106#endif /* CONFIG_DEBUG_ICEDCC */
107
108#ifdef CONFIG_MMU
109 .macro addruart_current, rx, tmp1, tmp2
110 addruart \tmp1, \tmp2, \rx
111 mrc p15, 0, \rx, c1, c0
112 tst \rx, #1
113 moveq \rx, \tmp1
114 movne \rx, \tmp2
115 .endm
116
117#else /* !CONFIG_MMU */
118 .macro addruart_current, rx, tmp1, tmp2
119 addruart \rx, \tmp1
120 .endm
121
122#endif /* CONFIG_MMU */
123
124/*
125 * Useful debugging routines
126 */
127ENTRY(printhex8)
128 mov r1, #8
129 b printhex
130ENDPROC(printhex8)
131
132ENTRY(printhex4)
133 mov r1, #4
134 b printhex
135ENDPROC(printhex4)
136
137ENTRY(printhex2)
138 mov r1, #2
139printhex: adr r2, hexbuf
140 add r3, r2, r1
141 mov r1, #0
142 strb r1, [r3]
1431: and r1, r0, #15
144 mov r0, r0, lsr #4
145 cmp r1, #10
146 addlt r1, r1, #'0'
147 addge r1, r1, #'a' - 10
148 strb r1, [r3, #-1]!
149 teq r3, r2
150 bne 1b
151 mov r0, r2
152 b printascii
153ENDPROC(printhex2)
154
155hexbuf: .space 16
156
157 .ltorg
158
159#ifndef CONFIG_DEBUG_SEMIHOSTING
160
161ENTRY(printascii)
162 addruart_current r3, r1, r2
163 b 2f
1641: waituart r2, r3
165 senduart r1, r3
166 busyuart r2, r3
167 teq r1, #'\n'
168 moveq r1, #'\r'
169 beq 1b
1702: teq r0, #0
171 ldrneb r1, [r0], #1
172 teqne r1, #0
173 bne 1b
174 mov pc, lr
175ENDPROC(printascii)
176
177ENTRY(printch)
178 addruart_current r3, r1, r2
179 mov r1, r0
180 mov r0, #0
181 b 1b
182ENDPROC(printch)
183
184#else
185
186ENTRY(printascii)
187 mov r1, r0
188 mov r0, #0x04 @ SYS_WRITE0
189 ARM( svc #0x123456 )
190 THUMB( svc #0xab )
191 mov pc, lr
192ENDPROC(printascii)
193
194ENTRY(printch)
195 adr r1, hexbuf
196 strb r0, [r1]
197 mov r0, #0x03 @ SYS_WRITEC
198 ARM( svc #0x123456 )
199 THUMB( svc #0xab )
200 mov pc, lr
201ENDPROC(printch)
202
203#endif