1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * linux/arch/unicore32/kernel/debug.S
4 *
5 * Code specific to PKUnity SoC and UniCore ISA
6 *
7 * Copyright (C) 2001-2010 GUAN Xue-tao
8 *
9 *  32-bit debugging code
10 */
11#include <linux/linkage.h>
12#include <asm/assembler.h>
13
14		.text
15
16/*
17 * Some debugging routines (useful if you've got MM problems and
18 * printk isn't working).  For DEBUGGING ONLY!!!  Do not leave
19 * references to these in a production kernel!
20 */
21#include "debug-macro.S"
22
23/*
24 * Useful debugging routines
25 */
26ENTRY(printhex8)
27		mov	r1, #8
28		b	printhex
29ENDPROC(printhex8)
30
31ENTRY(printhex4)
32		mov	r1, #4
33		b	printhex
34ENDPROC(printhex4)
35
36ENTRY(printhex2)
37		mov	r1, #2
38printhex:	adr	r2, hexbuf
39		add	r3, r2, r1
40		mov	r1, #0
41		stb	r1, [r3]
421:		and	r1, r0, #15
43		mov	r0, r0 >> #4
44		csub.a	r1, #10
45		beg	2f
46		add	r1, r1, #'0' - 'a' + 10
472:		add	r1, r1, #'a' - 10
48		stb.w	r1, [r3+], #-1
49		cxor.a	r3, r2
50		bne	1b
51		mov	r0, r2
52		b	printascii
53ENDPROC(printhex2)
54
55		.ltorg
56
57ENTRY(printascii)
58		addruart r3
59		b	2f
601:		waituart r2, r3
61		senduart r1, r3
62		busyuart r2, r3
63		cxor.a	r1, #'\n'
64		cmoveq	r1, #'\r'
65		beq	1b
662:		cxor.a	r0, #0
67		beq	3f
68		ldb.w	r1, [r0]+, #1
69		cxor.a	r1, #0
70		bne	1b
713:		mov	pc, lr
72ENDPROC(printascii)
73
74ENTRY(printch)
75		addruart r3
76		mov	r1, r0
77		mov	r0, #0
78		b	1b
79ENDPROC(printch)
80
81hexbuf:		.space 16
82
83