Linux-2.6.12-rc2
[linux-2.6.git] / arch / arm / kernel / debug.S
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/config.h>
13 #include <linux/linkage.h>
14 #include <asm/hardware.h>
15
16                 .text
17
18 /*
19  * Some debugging routines (useful if you've got MM problems and
20  * printk isn't working).  For DEBUGGING ONLY!!!  Do not leave
21  * references to these in a production kernel!
22  */
23
24 #if defined(CONFIG_DEBUG_ICEDCC)
25                 @@ debug using ARM EmbeddedICE DCC channel
26                 .macro  addruart, rx
27                 .endm
28
29                 .macro  senduart, rd, rx
30                 mcr     p14, 0, \rd, c1, c0, 0
31                 .endm
32
33                 .macro  busyuart, rd, rx
34 1001:
35                 mrc     p14, 0, \rx, c0, c0, 0
36                 tst     \rx, #2
37                 beq     1001b
38
39                 .endm
40
41                 .macro  waituart, rd, rx
42                 mov     \rd, #0x2000000
43 1001:
44                 subs    \rd, \rd, #1
45                 bmi     1002f
46                 mrc     p14, 0, \rx, c0, c0, 0
47                 tst     \rx, #2
48                 bne     1001b
49 1002:
50                 .endm
51 #else
52 #include <asm/arch/debug-macro.S>
53 #endif
54
55 /*
56  * Useful debugging routines
57  */
58 ENTRY(printhex8)
59                 mov     r1, #8
60                 b       printhex
61
62 ENTRY(printhex4)
63                 mov     r1, #4
64                 b       printhex
65
66 ENTRY(printhex2)
67                 mov     r1, #2
68 printhex:       adr     r2, hexbuf
69                 add     r3, r2, r1
70                 mov     r1, #0
71                 strb    r1, [r3]
72 1:              and     r1, r0, #15
73                 mov     r0, r0, lsr #4
74                 cmp     r1, #10
75                 addlt   r1, r1, #'0'
76                 addge   r1, r1, #'a' - 10
77                 strb    r1, [r3, #-1]!
78                 teq     r3, r2
79                 bne     1b
80                 mov     r0, r2
81                 b       printascii
82
83                 .ltorg
84
85 ENTRY(printascii)
86                 addruart r3
87                 b       2f
88 1:              waituart r2, r3
89                 senduart r1, r3
90                 busyuart r2, r3
91                 teq     r1, #'\n'
92                 moveq   r1, #'\r'
93                 beq     1b
94 2:              teq     r0, #0
95                 ldrneb  r1, [r0], #1
96                 teqne   r1, #0
97                 bne     1b
98                 mov     pc, lr
99
100 ENTRY(printch)
101                 addruart r3
102                 mov     r1, r0
103                 mov     r0, #0
104                 b       1b
105
106 hexbuf:         .space 16