blob: caaa919ab47a1776af856efb622345ca037f058e [file] [log] [blame]
* linux/arch/arm/kernel/debug.S
* Copyright (C) 1994-1999 Russell King
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
* 32-bit debugging code
#include <linux/config.h>
#include <linux/linkage.h>
#include <asm/hardware.h>
* Some debugging routines (useful if you've got MM problems and
* printk isn't working). For DEBUGGING ONLY!!! Do not leave
* references to these in a production kernel!
@@ debug using ARM EmbeddedICE DCC channel
.macro addruart, rx
.macro senduart, rd, rx
mcr p14, 0, \rd, c1, c0, 0
.macro busyuart, rd, rx
mrc p14, 0, \rx, c0, c0, 0
tst \rx, #2
beq 1001b
.macro waituart, rd, rx
mov \rd, #0x2000000
subs \rd, \rd, #1
bmi 1002f
mrc p14, 0, \rx, c0, c0, 0
tst \rx, #2
bne 1001b
#include <asm/arch/debug-macro.S>
* Useful debugging routines
mov r1, #8
b printhex
mov r1, #4
b printhex
mov r1, #2
printhex: adr r2, hexbuf
add r3, r2, r1
mov r1, #0
strb r1, [r3]
1: and r1, r0, #15
mov r0, r0, lsr #4
cmp r1, #10
addlt r1, r1, #'0'
addge r1, r1, #'a' - 10
strb r1, [r3, #-1]!
teq r3, r2
bne 1b
mov r0, r2
b printascii
addruart r3
b 2f
1: waituart r2, r3
senduart r1, r3
busyuart r2, r3
teq r1, #'\n'
moveq r1, #'\r'
beq 1b
2: teq r0, #0
ldrneb r1, [r0], #1
teqne r1, #0
bne 1b
mov pc, lr
addruart r3
mov r1, r0
mov r0, #0
b 1b
hexbuf: .space 16