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/*
* 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/linkage.h>
#include <asm/assembler.h>
.text
/*
* 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!
*/
#if defined(CONFIG_DEBUG_ICEDCC)
@@ debug using ARM EmbeddedICE DCC channel
.macro addruart, rp, rv, tmp
.endm
#if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7)
.macro senduart, rd, rx
mcr p14, 0, \rd, c0, c5, 0
.endm
.macro busyuart, rd, rx
1001:
mrc p14, 0, \rx, c0, c1, 0
tst \rx, #0x20000000
beq 1001b
.endm
.macro waituart, rd, rx
mov \rd, #0x2000000
1001:
subs \rd, \rd, #1
bmi 1002f
mrc p14, 0, \rx, c0, c1, 0
tst \rx, #0x20000000
bne 1001b
1002:
.endm
#elif defined(CONFIG_CPU_XSCALE)
.macro senduart, rd, rx
mcr p14, 0, \rd, c8, c0, 0
.endm
.macro busyuart, rd, rx
1001:
mrc p14, 0, \rx, c14, c0, 0
tst \rx, #0x10000000
beq 1001b
.endm
.macro waituart, rd, rx
mov \rd, #0x10000000
1001:
subs \rd, \rd, #1
bmi 1002f
mrc p14, 0, \rx, c14, c0, 0
tst \rx, #0x10000000
bne 1001b
1002:
.endm
#else
.macro senduart, rd, rx
mcr p14, 0, \rd, c1, c0, 0
.endm
.macro busyuart, rd, rx
1001:
mrc p14, 0, \rx, c0, c0, 0
tst \rx, #2
beq 1001b
.endm
.macro waituart, rd, rx
mov \rd, #0x2000000
1001:
subs \rd, \rd, #1
bmi 1002f
mrc p14, 0, \rx, c0, c0, 0
tst \rx, #2
bne 1001b
1002:
.endm
#endif /* CONFIG_CPU_V6 */
#elif !defined(CONFIG_DEBUG_SEMIHOSTING)
#include <mach/debug-macro.S>
#endif /* CONFIG_DEBUG_ICEDCC */
#ifdef CONFIG_MMU
.macro addruart_current, rx, tmp1, tmp2
addruart \tmp1, \tmp2, \rx
mrc p15, 0, \rx, c1, c0
tst \rx, #1
moveq \rx, \tmp1
movne \rx, \tmp2
.endm
#else /* !CONFIG_MMU */
.macro addruart_current, rx, tmp1, tmp2
addruart \rx, \tmp1
.endm
#endif /* CONFIG_MMU */
/*
* Useful debugging routines
*/
ENTRY(printhex8)
mov r1, #8
b printhex
ENDPROC(printhex8)
ENTRY(printhex4)
mov r1, #4
b printhex
ENDPROC(printhex4)
ENTRY(printhex2)
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
ENDPROC(printhex2)
hexbuf: .space 16
.ltorg
#ifndef CONFIG_DEBUG_SEMIHOSTING
ENTRY(printascii)
addruart_current r3, r1, r2
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
ENDPROC(printascii)
ENTRY(printch)
addruart_current r3, r1, r2
mov r1, r0
mov r0, #0
b 1b
ENDPROC(printch)
#else
ENTRY(printascii)
mov r1, r0
mov r0, #0x04 @ SYS_WRITE0
ARM( svc #0x123456 )
THUMB( svc #0xab )
mov pc, lr
ENDPROC(printascii)
ENTRY(printch)
adr r1, hexbuf
strb r0, [r1]
mov r0, #0x03 @ SYS_WRITEC
ARM( svc #0x123456 )
THUMB( svc #0xab )
mov pc, lr
ENDPROC(printch)
#endif
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