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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#ifdef CONFIG_DEBUG_UART_FLOW_CONTROL
93 waituartcts r2, r3
94#endif
95 waituarttxrdy r2, r3
96 senduart r1, r3
97 busyuart r2, r3
98 mov r1, #'\n'
993:
100#ifdef CONFIG_DEBUG_UART_FLOW_CONTROL
101 waituartcts r2, r3
102#endif
103 waituarttxrdy r2, r3
104 senduart r1, r3
105 busyuart r2, r3
106 b 1b
107ENDPROC(printascii)
108
109ENTRY(printch)
110 addruart_current r3, r1, r2
111 mov r1, r0
112 mov r0, #0
113 b 2b
114ENDPROC(printch)
115
116#ifdef CONFIG_MMU
117ENTRY(debug_ll_addr)
118 addruart r2, r3, ip
119 str r2, [r0]
120 str r3, [r1]
121 ret lr
122ENDPROC(debug_ll_addr)
123#endif
124
125#else
126
127ENTRY(printascii)
128 mov r1, r0
129 mov r0, #0x04 @ SYS_WRITE0
130 ARM( svc #0x123456 )
131#ifdef CONFIG_CPU_V7M
132 THUMB( bkpt #0xab )
133#else
134 THUMB( svc #0xab )
135#endif
136 ret lr
137ENDPROC(printascii)
138
139ENTRY(printch)
140 adr r1, hexbuf_rel
141 ldr r2, [r1]
142 add r1, r1, r2
143 strb r0, [r1]
144 mov r0, #0x03 @ SYS_WRITEC
145 ARM( svc #0x123456 )
146#ifdef CONFIG_CPU_V7M
147 THUMB( bkpt #0xab )
148#else
149 THUMB( svc #0xab )
150#endif
151 ret lr
152ENDPROC(printch)
153
154ENTRY(debug_ll_addr)
155 mov r2, #0
156 str r2, [r0]
157 str r2, [r1]
158 ret lr
159ENDPROC(debug_ll_addr)
160
161#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
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