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d2912cb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
1da177e4 LT |
2 | /* |
3 | * linux/arch/arm/kernel/debug.S | |
4 | * | |
5 | * Copyright (C) 1994-1999 Russell King | |
6 | * | |
1da177e4 LT |
7 | * 32-bit debugging code |
8 | */ | |
1da177e4 | 9 | #include <linux/linkage.h> |
6f6f6a70 | 10 | #include <asm/assembler.h> |
1da177e4 LT |
11 | |
12 | .text | |
13 | ||
14 | /* | |
15 | * Some debugging routines (useful if you've got MM problems and | |
16 | * printk isn't working). For DEBUGGING ONLY!!! Do not leave | |
17 | * references to these in a production kernel! | |
18 | */ | |
19 | ||
91a9fec0 RH |
20 | #if !defined(CONFIG_DEBUG_SEMIHOSTING) |
21 | #include CONFIG_DEBUG_LL_INCLUDE | |
22 | #endif | |
1da177e4 | 23 | |
0ea12930 JK |
24 | #ifdef CONFIG_MMU |
25 | .macro addruart_current, rx, tmp1, tmp2 | |
639da5ee | 26 | addruart \tmp1, \tmp2, \rx |
0ea12930 JK |
27 | mrc p15, 0, \rx, c1, c0 |
28 | tst \rx, #1 | |
29 | moveq \rx, \tmp1 | |
30 | movne \rx, \tmp2 | |
31 | .endm | |
32 | ||
33 | #else /* !CONFIG_MMU */ | |
34 | .macro addruart_current, rx, tmp1, tmp2 | |
7505f042 | 35 | addruart \rx, \tmp1, \tmp2 |
0ea12930 JK |
36 | .endm |
37 | ||
38 | #endif /* CONFIG_MMU */ | |
39 | ||
1da177e4 LT |
40 | /* |
41 | * Useful debugging routines | |
42 | */ | |
43 | ENTRY(printhex8) | |
44 | mov r1, #8 | |
45 | b printhex | |
93ed3970 | 46 | ENDPROC(printhex8) |
1da177e4 LT |
47 | |
48 | ENTRY(printhex4) | |
49 | mov r1, #4 | |
50 | b printhex | |
93ed3970 | 51 | ENDPROC(printhex4) |
1da177e4 LT |
52 | |
53 | ENTRY(printhex2) | |
54 | mov r1, #2 | |
e11d1314 NP |
55 | printhex: adr r2, hexbuf_rel |
56 | ldr r3, [r2] | |
57 | add r2, r2, r3 | |
1da177e4 LT |
58 | add r3, r2, r1 |
59 | mov r1, #0 | |
60 | strb r1, [r3] | |
61 | 1: and r1, r0, #15 | |
62 | mov r0, r0, lsr #4 | |
63 | cmp r1, #10 | |
64 | addlt r1, r1, #'0' | |
65 | addge r1, r1, #'a' - 10 | |
66 | strb r1, [r3, #-1]! | |
67 | teq r3, r2 | |
68 | bne 1b | |
69 | mov r0, r2 | |
70 | b printascii | |
93ed3970 | 71 | ENDPROC(printhex2) |
1da177e4 | 72 | |
e11d1314 NP |
73 | .pushsection .bss |
74 | hexbuf_addr: .space 16 | |
75 | .popsection | |
76 | .align | |
77 | hexbuf_rel: .long hexbuf_addr - . | |
b55fa188 | 78 | |
1da177e4 LT |
79 | .ltorg |
80 | ||
9b5a146a NP |
81 | #ifndef CONFIG_DEBUG_SEMIHOSTING |
82 | ||
1da177e4 | 83 | ENTRY(printascii) |
0ea12930 | 84 | addruart_current r3, r1, r2 |
2a14b80c | 85 | 1: teq r0, #0 |
e44fc388 | 86 | ldrbne r1, [r0], #1 |
1da177e4 | 87 | teqne r1, #0 |
2a14b80c NP |
88 | reteq lr |
89 | 2: teq r1, #'\n' | |
90 | bne 3f | |
91 | mov r1, #'\r' | |
92 | waituart r2, r3 | |
93 | senduart r1, r3 | |
94 | busyuart r2, r3 | |
95 | mov r1, #'\n' | |
96 | 3: waituart r2, r3 | |
97 | senduart r1, r3 | |
98 | busyuart r2, r3 | |
99 | b 1b | |
93ed3970 | 100 | ENDPROC(printascii) |
1da177e4 LT |
101 | |
102 | ENTRY(printch) | |
0ea12930 | 103 | addruart_current r3, r1, r2 |
1da177e4 LT |
104 | mov r1, r0 |
105 | mov r0, #0 | |
2a14b80c | 106 | b 2b |
93ed3970 | 107 | ENDPROC(printch) |
9b5a146a | 108 | |
a73b59c5 | 109 | #ifdef CONFIG_MMU |
e5c5f2ad RH |
110 | ENTRY(debug_ll_addr) |
111 | addruart r2, r3, ip | |
112 | str r2, [r0] | |
113 | str r3, [r1] | |
6ebbf2ce | 114 | ret lr |
e5c5f2ad | 115 | ENDPROC(debug_ll_addr) |
a73b59c5 | 116 | #endif |
e5c5f2ad | 117 | |
9b5a146a NP |
118 | #else |
119 | ||
120 | ENTRY(printascii) | |
121 | mov r1, r0 | |
122 | mov r0, #0x04 @ SYS_WRITE0 | |
123 | ARM( svc #0x123456 ) | |
ee3eaee6 NP |
124 | #ifdef CONFIG_CPU_V7M |
125 | THUMB( bkpt #0xab ) | |
126 | #else | |
9b5a146a | 127 | THUMB( svc #0xab ) |
ee3eaee6 | 128 | #endif |
6ebbf2ce | 129 | ret lr |
9b5a146a NP |
130 | ENDPROC(printascii) |
131 | ||
132 | ENTRY(printch) | |
e11d1314 NP |
133 | adr r1, hexbuf_rel |
134 | ldr r2, [r1] | |
135 | add r1, r1, r2 | |
9b5a146a NP |
136 | strb r0, [r1] |
137 | mov r0, #0x03 @ SYS_WRITEC | |
138 | ARM( svc #0x123456 ) | |
ee3eaee6 NP |
139 | #ifdef CONFIG_CPU_V7M |
140 | THUMB( bkpt #0xab ) | |
141 | #else | |
9b5a146a | 142 | THUMB( svc #0xab ) |
ee3eaee6 | 143 | #endif |
6ebbf2ce | 144 | ret lr |
9b5a146a NP |
145 | ENDPROC(printch) |
146 | ||
e5c5f2ad RH |
147 | ENTRY(debug_ll_addr) |
148 | mov r2, #0 | |
149 | str r2, [r0] | |
150 | str r2, [r1] | |
6ebbf2ce | 151 | ret lr |
e5c5f2ad RH |
152 | ENDPROC(debug_ll_addr) |
153 | ||
9b5a146a | 154 | #endif |