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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#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_SEMIHOSTING)
24#include CONFIG_DEBUG_LL_INCLUDE
25#endif
26
27#ifdef CONFIG_MMU
28 .macro addruart_current, rx, tmp1, tmp2
29 addruart \tmp1, \tmp2, \rx
30 mrc p15, 0, \rx, c1, c0
31 tst \rx, #1
32 moveq \rx, \tmp1
33 movne \rx, \tmp2
34 .endm
35
36#else /* !CONFIG_MMU */
37 .macro addruart_current, rx, tmp1, tmp2
38 addruart \rx, \tmp1, \tmp2
39 .endm
40
41#endif /* CONFIG_MMU */
42
43/*
44 * Useful debugging routines
45 */
46ENTRY(printhex8)
47 mov r1, #8
48 b printhex
49ENDPROC(printhex8)
50
51ENTRY(printhex4)
52 mov r1, #4
53 b printhex
54ENDPROC(printhex4)
55
56ENTRY(printhex2)
57 mov r1, #2
58printhex: adr r2, hexbuf
59 add r3, r2, r1
60 mov r1, #0
61 strb r1, [r3]
621: and r1, r0, #15
63 mov r0, r0, lsr #4
64 cmp r1, #10
65 addlt r1, r1, #'0'
66 addge r1, r1, #'a' - 10
67 strb r1, [r3, #-1]!
68 teq r3, r2
69 bne 1b
70 mov r0, r2
71 b printascii
72ENDPROC(printhex2)
73
74hexbuf: .space 16
75
76 .ltorg
77
78#ifndef CONFIG_DEBUG_SEMIHOSTING
79
80ENTRY(printascii)
81 addruart_current r3, r1, r2
82 b 2f
831: waituart r2, r3
84 senduart r1, r3
85 busyuart r2, r3
86 teq r1, #'\n'
87 moveq r1, #'\r'
88 beq 1b
892: teq r0, #0
90 ldrneb r1, [r0], #1
91 teqne r1, #0
92 bne 1b
93 ret lr
94ENDPROC(printascii)
95
96ENTRY(printch)
97 addruart_current r3, r1, r2
98 mov r1, r0
99 mov r0, #0
100 b 1b
101ENDPROC(printch)
102
103#ifdef CONFIG_MMU
104ENTRY(debug_ll_addr)
105 addruart r2, r3, ip
106 str r2, [r0]
107 str r3, [r1]
108 ret lr
109ENDPROC(debug_ll_addr)
110#endif
111
112#else
113
114ENTRY(printascii)
115 mov r1, r0
116 mov r0, #0x04 @ SYS_WRITE0
117 ARM( svc #0x123456 )
118 THUMB( svc #0xab )
119 ret lr
120ENDPROC(printascii)
121
122ENTRY(printch)
123 adr r1, hexbuf
124 strb r0, [r1]
125 mov r0, #0x03 @ SYS_WRITEC
126 ARM( svc #0x123456 )
127 THUMB( svc #0xab )
128 ret lr
129ENDPROC(printch)
130
131ENTRY(debug_ll_addr)
132 mov r2, #0
133 str r2, [r0]
134 str r2, [r1]
135 ret lr
136ENDPROC(debug_ll_addr)
137
138#endif
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_SEMIHOSTING)
24#include CONFIG_DEBUG_LL_INCLUDE
25#endif
26
27#ifdef CONFIG_MMU
28 .macro addruart_current, rx, tmp1, tmp2
29 addruart \tmp1, \tmp2, \rx
30 mrc p15, 0, \rx, c1, c0
31 tst \rx, #1
32 moveq \rx, \tmp1
33 movne \rx, \tmp2
34 .endm
35
36#else /* !CONFIG_MMU */
37 .macro addruart_current, rx, tmp1, tmp2
38 addruart \rx, \tmp1, \tmp2
39 .endm
40
41#endif /* CONFIG_MMU */
42
43/*
44 * Useful debugging routines
45 */
46ENTRY(printhex8)
47 mov r1, #8
48 b printhex
49ENDPROC(printhex8)
50
51ENTRY(printhex4)
52 mov r1, #4
53 b printhex
54ENDPROC(printhex4)
55
56ENTRY(printhex2)
57 mov r1, #2
58printhex: adr r2, hexbuf_rel
59 ldr r3, [r2]
60 add r2, r2, r3
61 add r3, r2, r1
62 mov r1, #0
63 strb r1, [r3]
641: and r1, r0, #15
65 mov r0, r0, lsr #4
66 cmp r1, #10
67 addlt r1, r1, #'0'
68 addge r1, r1, #'a' - 10
69 strb r1, [r3, #-1]!
70 teq r3, r2
71 bne 1b
72 mov r0, r2
73 b printascii
74ENDPROC(printhex2)
75
76 .pushsection .bss
77hexbuf_addr: .space 16
78 .popsection
79 .align
80hexbuf_rel: .long hexbuf_addr - .
81
82 .ltorg
83
84#ifndef CONFIG_DEBUG_SEMIHOSTING
85
86ENTRY(printascii)
87 addruart_current r3, r1, r2
881: teq r0, #0
89 ldrneb r1, [r0], #1
90 teqne r1, #0
91 reteq lr
922: teq r1, #'\n'
93 bne 3f
94 mov r1, #'\r'
95 waituart r2, r3
96 senduart r1, r3
97 busyuart r2, r3
98 mov r1, #'\n'
993: waituart r2, r3
100 senduart r1, r3
101 busyuart r2, r3
102 b 1b
103ENDPROC(printascii)
104
105ENTRY(printch)
106 addruart_current r3, r1, r2
107 mov r1, r0
108 mov r0, #0
109 b 2b
110ENDPROC(printch)
111
112#ifdef CONFIG_MMU
113ENTRY(debug_ll_addr)
114 addruart r2, r3, ip
115 str r2, [r0]
116 str r3, [r1]
117 ret lr
118ENDPROC(debug_ll_addr)
119#endif
120
121#else
122
123ENTRY(printascii)
124 mov r1, r0
125 mov r0, #0x04 @ SYS_WRITE0
126 ARM( svc #0x123456 )
127#ifdef CONFIG_CPU_V7M
128 THUMB( bkpt #0xab )
129#else
130 THUMB( svc #0xab )
131#endif
132 ret lr
133ENDPROC(printascii)
134
135ENTRY(printch)
136 adr r1, hexbuf_rel
137 ldr r2, [r1]
138 add r1, r1, r2
139 strb r0, [r1]
140 mov r0, #0x03 @ SYS_WRITEC
141 ARM( svc #0x123456 )
142#ifdef CONFIG_CPU_V7M
143 THUMB( bkpt #0xab )
144#else
145 THUMB( svc #0xab )
146#endif
147 ret lr
148ENDPROC(printch)
149
150ENTRY(debug_ll_addr)
151 mov r2, #0
152 str r2, [r0]
153 str r2, [r1]
154 ret lr
155ENDPROC(debug_ll_addr)
156
157#endif