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Adaptation/GUID-892931C3-E560-54AA-A9CB-2820BF025E52.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
changeset 15 307f4279f433
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License
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"Eclipse Public License v1.0" which accompanies this distribution,
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors:
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-892931C3-E560-54AA-A9CB-2820BF025E52" xml:lang="en"><title>Fault
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Information Commands</title><shortdesc>Describes how to use the <codeph>f</codeph> command to get information
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about the fault type. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>There are two possibilities: </p>
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<ul>
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<li id="GUID-3929E483-85B8-5382-8467-632E4601281B"><p> <xref href="GUID-892931C3-E560-54AA-A9CB-2820BF025E52.dita#GUID-892931C3-E560-54AA-A9CB-2820BF025E52/GUID-02C96922-6987-50B3-9759-8F591ECA5C1B">an unhandled exception has occurred</xref>  </p> </li>
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<li id="GUID-EAA3FE0B-A66F-5505-BDE6-C5E9E6AB1370"><p> <xref href="GUID-892931C3-E560-54AA-A9CB-2820BF025E52.dita#GUID-892931C3-E560-54AA-A9CB-2820BF025E52/GUID-16FEDD9F-2E27-5FB8-AAD3-E61589FC3CC1">a panic has occurred</xref>  </p> </li>
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</ul>
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<p>To start, use the <xref href="GUID-08E14B34-5144-5AA8-AA55-7AF03671676C.dita#GUID-08E14B34-5144-5AA8-AA55-7AF03671676C/GUID-D5F2E0AF-EF03-5150-813B-DF989F12C47B">f</xref> command.
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You will see something like this: </p>
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<codeblock id="GUID-05D1AE94-2DA3-50EE-8EB8-E3C5645E5329" xml:space="preserve">Fault Category: Exception  Fault Reason: 10000000
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ExcId 00000001 CodeAddr f800415c DataAddr 00000000 Extra 00000005
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Exc 1 Cpsr=60000013 FAR=00000000 FSR=00000005
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 R0=64007328  R1=00000000  R2=00000000  R3=00000001
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 R4=64007328  R5=640074c0  R6=00000000  R7=f8047ba4
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 R8=64006f80  R9=64006fec R10=00000013 R11=64006ec4
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R12=00000001 R13=000029b4 R14=0000016c R15=f800415c
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R13Svc=64006ea8 R14Svc=f8002b2c SpsrSvc=600000ff
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</codeblock>
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<p>The <i>Fault Category</i> field shows the type of fault, in this case an
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exception. </p>
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<section id="GUID-02C96922-6987-50B3-9759-8F591ECA5C1B"><title> Unhandled
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exceptions</title> <p>If the <i>Fault Category</i> is <i>Exception</i>, then
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the fault is caused by an unhandled processor exception. You can get further
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information on the type of exception by looking at the first three lines of
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the generated output: </p> <codeblock id="GUID-C294FEB9-EFAE-56E9-B882-1CA4B0A3D9FB" xml:space="preserve">Fault Category: Exception  Fault Reason: 10000000
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ExcId 00000001 CodeAddr f800415c DataAddr 00000000 Extra 00000005
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Exc 1 Cpsr=60000013 FAR=00000000 FSR=00000005</codeblock> <p>The <codeph>CodeAddr</codeph> and <codeph>DataAddr</codeph> fields
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show the address of the instruction that caused the exception and, depending
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on the type of exception and instruction, the address of the data the instruction
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was trying to access. You can use the <codeph>CodeAddr</codeph> value to find
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the function which was being executed by <xref href="GUID-DA62FD4F-2E74-5B2F-B703-4A40DF5F01CA.dita">using
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the MAKSYM tool</xref>. </p> <p>The number after <codeph>ExcId</codeph> is
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the type of exception, in hexadecimal, and is one of the <xref href="GUID-7ECDCF7B-3B2A-561F-9136-04BC4DAE46E4.dita#GUID-7ECDCF7B-3B2A-561F-9136-04BC4DAE46E4/GUID-567330BE-A308-50CD-9EB8-891E45FA8294">ARM exception types</xref>. The meaning of the numbers depends on the type
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of processor. </p> <ul>
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<li id="GUID-7EA2C471-63B5-5D22-A8EE-A24ADFB326DE"><p>If the exception is
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a prefetch abort, then the code address is invalid. </p> </li>
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<li id="GUID-F04A8010-64F7-5D52-8066-3A446DF0C645"><p>A data abort means that
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the code address is invalid. </p> </li>
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</ul> <p>The number after <codeph>FAR</codeph> is the fault address register;
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this is the address that caused the fault. </p> <p>The number after FSR is
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the <xref href="GUID-7ECDCF7B-3B2A-561F-9136-04BC4DAE46E4.dita#GUID-7ECDCF7B-3B2A-561F-9136-04BC4DAE46E4/GUID-E55E7DA9-61DC-57D9-9678-05D490FEE604">fault
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status register value</xref> and shows why the MMU raised an exception. </p> <p>The
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number after CPSR is the value of the CPU's CPSR register when the exception
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occurred. The 5 least-significant bits of the CPSR register indicate the <xref href="GUID-7ECDCF7B-3B2A-561F-9136-04BC4DAE46E4.dita#GUID-7ECDCF7B-3B2A-561F-9136-04BC4DAE46E4/GUID-BFA2235C-1598-59E6-9F1F-A8281F13A957">ARM
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processor modes (CPSR register)</xref>. </p> </section>
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<section id="GUID-16FEDD9F-2E27-5FB8-AAD3-E61589FC3CC1"><title>Panics</title> <p>If
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the <i>Fault Category</i> is not <i>Exception</i>, then the fault is due to
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a panic. In this case the only other valid field is the <i>Fault reason</i>;
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the values of all other fields are meaningless. </p> <p>The panic number is
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the low 16-bits of the fault reason, shown in hexadecimal. </p> <p>For example,
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a KERN 27 panic would generate: </p> <codeblock id="GUID-F1335B4B-F7AB-5502-8C3C-E1CB6774E1B4" xml:space="preserve">Fault Category: KERN  Fault Reason: 0000001b
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ExcId ffffee5e CodeAddr ffff99a9 DataAddr bfff3e54 Extra fffec4cd
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</codeblock> <p>If the panic is KERN 4, then a thread or process marked as
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protected has panicked. For other panics, kernel side code has panicked; this
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code is either in the kernel itself or in a device driver. </p> <p>See <xref href="GUID-1E822A8F-3144-509D-A949-BDAF4BB9634A.dita">Kernel State Information
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Commands</xref> to find out which process and thread were running at the time
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of the panic. </p> </section>
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</conbody></concept>
MCL/sftools/depl/docscontent