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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * linux/arch/arm/kernel/debug.S
4 *
5 * Copyright (C) 1994-1999 Russell King
6 *
7 * 32-bit debugging code
8 */
9#include <linux/linkage.h>
10#include <asm/assembler.h>
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
20#if !defined(CONFIG_DEBUG_SEMIHOSTING)
21#include CONFIG_DEBUG_LL_INCLUDE
22#endif
23
24#ifdef CONFIG_MMU
25 .macro addruart_current, rx, tmp1, tmp2
26 addruart \tmp1, \tmp2, \rx
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
35 addruart \rx, \tmp1, \tmp2
36 .endm
37
38#endif /* CONFIG_MMU */
39
40/*
41 * Useful debugging routines
42 */
43ENTRY(printhex8)
44 mov r1, #8
45 b printhex
46ENDPROC(printhex8)
47
48ENTRY(printhex4)
49 mov r1, #4
50 b printhex
51ENDPROC(printhex4)
52
53ENTRY(printhex2)
54 mov r1, #2
55printhex: adr r2, hexbuf_rel
56 ldr r3, [r2]
57 add r2, r2, r3
58 add r3, r2, r1
59 mov r1, #0
60 strb r1, [r3]
611: 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
71ENDPROC(printhex2)
72
73 .pushsection .bss
74hexbuf_addr: .space 16
75 .popsection
76 .align
77hexbuf_rel: .long hexbuf_addr - .
78
79 .ltorg
80
81#ifndef CONFIG_DEBUG_SEMIHOSTING
82
83ENTRY(printascii)
84 addruart_current r3, r1, r2
851: teq r0, #0
86 ldrbne r1, [r0], #1
87 teqne r1, #0
88 reteq lr
892: 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'
963: waituart r2, r3
97 senduart r1, r3
98 busyuart r2, r3
99 b 1b
100ENDPROC(printascii)
101
102ENTRY(printch)
103 addruart_current r3, r1, r2
104 mov r1, r0
105 mov r0, #0
106 b 2b
107ENDPROC(printch)
108
109#ifdef CONFIG_MMU
110ENTRY(debug_ll_addr)
111 addruart r2, r3, ip
112 str r2, [r0]
113 str r3, [r1]
114 ret lr
115ENDPROC(debug_ll_addr)
116#endif
117
118#else
119
120ENTRY(printascii)
121 mov r1, r0
122 mov r0, #0x04 @ SYS_WRITE0
123 ARM( svc #0x123456 )
124#ifdef CONFIG_CPU_V7M
125 THUMB( bkpt #0xab )
126#else
127 THUMB( svc #0xab )
128#endif
129 ret lr
130ENDPROC(printascii)
131
132ENTRY(printch)
133 adr r1, hexbuf_rel
134 ldr r2, [r1]
135 add r1, r1, r2
136 strb r0, [r1]
137 mov r0, #0x03 @ SYS_WRITEC
138 ARM( svc #0x123456 )
139#ifdef CONFIG_CPU_V7M
140 THUMB( bkpt #0xab )
141#else
142 THUMB( svc #0xab )
143#endif
144 ret lr
145ENDPROC(printch)
146
147ENTRY(debug_ll_addr)
148 mov r2, #0
149 str r2, [r0]
150 str r2, [r1]
151 ret lr
152ENDPROC(debug_ll_addr)
153
154#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_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