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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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28bab059a2
This patch implements low-level debug libraries with On-Chip-Debugger hardware support. Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn> Acked-by: Arnd Bergmann <arnd@arndb.de>
85 lines
1.4 KiB
ArmAsm
85 lines
1.4 KiB
ArmAsm
/*
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* linux/arch/unicore32/kernel/debug.S
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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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/linkage.h>
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#include <asm/assembler.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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#include "debug-macro.S"
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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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ENDPROC(printhex8)
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ENTRY(printhex4)
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mov r1, #4
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b printhex
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ENDPROC(printhex4)
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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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stb r1, [r3]
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1: and r1, r0, #15
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mov r0, r0 >> #4
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csub.a r1, #10
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beg 2f
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add r1, r1, #'0' - 'a' + 10
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2: add r1, r1, #'a' - 10
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stb.w r1, [r3+], #-1
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cxor.a 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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ENDPROC(printhex2)
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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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cxor.a r1, #'\n'
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cmoveq r1, #'\r'
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beq 1b
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2: cxor.a r0, #0
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beq 3f
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ldb.w r1, [r0]+, #1
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cxor.a r1, #0
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bne 1b
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3: mov pc, lr
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ENDPROC(printascii)
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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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ENDPROC(printch)
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hexbuf: .space 16
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