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107 lines
1.7 KiB
107 lines
1.7 KiB
20 years ago
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/*
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* linux/arch/arm/kernel/debug.S
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*
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* Copyright (C) 1994-1999 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* 32-bit debugging code
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*/
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#include <linux/config.h>
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#include <linux/linkage.h>
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#include <asm/hardware.h>
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.text
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/*
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* Some debugging routines (useful if you've got MM problems and
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* printk isn't working). For DEBUGGING ONLY!!! Do not leave
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* references to these in a production kernel!
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*/
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#if defined(CONFIG_DEBUG_ICEDCC)
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@@ debug using ARM EmbeddedICE DCC channel
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.macro addruart, rx
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.endm
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.macro senduart, rd, rx
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mcr p14, 0, \rd, c1, c0, 0
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.endm
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.macro busyuart, rd, rx
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1001:
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mrc p14, 0, \rx, c0, c0, 0
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tst \rx, #2
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beq 1001b
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.endm
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.macro waituart, rd, rx
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mov \rd, #0x2000000
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1001:
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subs \rd, \rd, #1
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bmi 1002f
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mrc p14, 0, \rx, c0, c0, 0
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tst \rx, #2
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bne 1001b
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1002:
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.endm
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#else
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#include <asm/arch/debug-macro.S>
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#endif
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/*
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* Useful debugging routines
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*/
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ENTRY(printhex8)
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mov r1, #8
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b printhex
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ENTRY(printhex4)
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mov r1, #4
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b printhex
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ENTRY(printhex2)
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mov r1, #2
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printhex: adr r2, hexbuf
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add r3, r2, r1
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mov r1, #0
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strb r1, [r3]
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1: and r1, r0, #15
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mov r0, r0, lsr #4
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cmp r1, #10
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addlt r1, r1, #'0'
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addge r1, r1, #'a' - 10
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strb r1, [r3, #-1]!
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teq r3, r2
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bne 1b
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mov r0, r2
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b printascii
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.ltorg
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ENTRY(printascii)
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addruart r3
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b 2f
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1: waituart r2, r3
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senduart r1, r3
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busyuart r2, r3
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teq r1, #'\n'
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moveq r1, #'\r'
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beq 1b
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2: teq r0, #0
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ldrneb r1, [r0], #1
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teqne r1, #0
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bne 1b
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mov pc, lr
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ENTRY(printch)
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addruart r3
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mov r1, r0
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mov r0, #0
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b 1b
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hexbuf: .space 16
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