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debuggercdi/com.nokia.carbide.cpp.debug.crashdebugger/html/DebuggingInformation/CrashDebuggerCallStack.guide04.html
author timkelly
Tue, 04 May 2010 09:39:10 -0500
branchRCL_2_4
changeset 1325 98aebbb322f3
parent 990 5d016a880824
permissions -rw-r--r--
Fix bug 11210. NPEs when editing SBSv2 config tab data on old SBSv2 build configs. Now allows saving SBSv2 variant data for old SBSv2 configs (i.e. before we display the build alias in the config name)
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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	"http://www.w3.org/TR/html4/loose.dtd">
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	<html><head>
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	<title>Tracing through the Stack Heuristically</title>
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	<link href="sysdoc-eclipse.css" type="text/css" rel="stylesheet" >
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	<link href="sysdoc-eclipse.css" type="text/css" rel="stylesheet" >
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	<link href="../../book.css" type="text/css" rel="stylesheet" >
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<div class="Head2">
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<h2>Tracing through the Stack Heuristically</h2>
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</div>
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<div>
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One way of tracing through the call stack is to assume that every word on the stack which looks like a ROM code address is a saved return
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address. We say that this heuristic because:
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<ul>
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<li>
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<p>some data words may look like code addresses in ROM.</p>
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</li>
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<li>
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<p>there may be saved return addresses left over from previous
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function calls. For example, suppose that F() calls
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A() and then B() in sequence. A() itself
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calls X(), which calls Y(). If a crash occurs in
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B(), the saved return addresses from the calls to X()
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and Y() are still present on the stack and may be mistaken for
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function calls occuring while B() is active.</p>
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<p>This scenario happens frequently when B()
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allocates a buffer (e.g. TBuf) on the stack which overlaps
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old stack frames.</p>
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<div class="Figure">
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<p class="Image"><a name=""><img src="CrashDebuggerCallStackHeuristic-01.gif" alt=""  border="0"></a></p>
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</div>
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</li>
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</ul>
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<p>If you want to trace applications loaded into RAM, then stack
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tracing is more difficult because RAM-loaded DLLs are given addresses assigned
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at load time.</p>
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<p>On ARM, the stack pointer starts at the higher address end and
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moves 'down' towards the lower address end. This means that values at the top
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of the memory dump are more recent. You need to look back through this for code
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addresses. For ROM code this will be words with most significant byte in the
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range 0xF8 to 0xFF, remembering that they are
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little-endian. This can either be done manually, or automatically using the
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printsym.pl perl script, which can be found in
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...\epoc32\tools.</p>
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<p>Let's follow this in an example session:</p>
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<ul>
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<li>
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<p>Decide whether the crash has been caused by a panic or an
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exception using the <a href="CrashDebugger_cmd_f.guide.html" title="The debug monitor and command syntax / f - display kernel fault information">f</a> command:</p>
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<p class="CodeBlock">.f<br>Fault Category: EXAMPLE  Fault Reason: 0000002a<br>ExcId 00000000 CodeAddr 00000000 DataAddr 00000000 Extra 00000000</p>
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</li>
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<li>
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<p>This shows that the crash was caused by a panic, so now use the
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<a href="CrashDebugger_cmd_r.guide.html" title="The debug monitor and command syntax / r - dump register contents">r</a> command to find
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the CPU mode and the stack pointer:</p>
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<p class="CodeBlock">.r<br>MODE_USR:<br>&nbsp;R0=6571de54  R1=0000002a  R2=00000002  R3=ffffffff<br>&nbsp;R4=0000002a  R5=f8170414  R6=6571df14  R7=6403cba8<br>&nbsp;R8=00000001  R9=6403c41c R10=640002f8 R11=6571de70<br>R12=00000020 R13=00404e00 R14=f80818c0 R15=f800bfa8<br>CPSR=60000013<br>MODE_FIQ:<br>&nbsp;R8=00000000  R9=ffffffff R10=ffffffff R11=00000000<br>R12=00000000 R13=64000d0c R14=c080079c SPSR=e00000dc<br>MODE_IRQ:<br>R13=6400110c R14=00000013 SPSR=20000013<br>MODE_SVC:<br>R13=6571de54 R14=f80328bc SPSR=60000010<br>MODE_ABT:<br>R13=6400090c R14=ffff0010 SPSR=400000d7<br>MODE_UND:<br>R13=6400090c R14=95221110 SPSR=f000009d</p>
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<p>The panic happened in supervisor mode, because CPSR &amp;
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0x1F == 0x13, so R13Svc, i.e. the value of R13
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shown under MODE_SVC: in the above display, is the stack pointer
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to look at; this has the value 0x6571DE54.</p>
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</li>
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<li>
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<p>Using the
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<a href="CrashDebugger_cmd_m.guide.html" title="The debug monitor and command syntax / m - do a memory dump">m</a> command to look
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at memory starting at location 0x6571DE54 gives:</p>
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<p class="CodeBlock">.m6571de54+200<br>6571de54: 07 00 00 10 14 04 17 f8 00 00 00 00 d4 4e 40 00 .............N@.<br>6571de64: e8 de 71 65 74 de 71 65 74 fb 16 f8 88 28 03 f8 ..qet.qet....(..<br>6571de74: 0c d4 03 f8 64 35 03 f8 00 00 00 00 00 00 00 00 ....d5..........<br>6571de84: d0 00 00 00 14 df 71 65 a8 cb 03 64 a8 cb 03 64 ......qe...d...d<br>6571de94: d0 00 00 00 14 df 71 65 1c df 71 65 ec 4e 40 00 ......qe..qe.N@.<br>6571dea4: 1c c4 03 64 b4 2a 03 f8 00 00 00 00 14 df 71 65 ...d.*........qe<br>6571deb4: d0 de 71 65 c4 de 71 65 b0 ab 03 f8 00 00 00 00 ..qe..qe........<br>6571dec4: e0 ba 03 64 14 df 71 65 1c df 71 65 01 00 00 00 ...d..qe..qe....<br>6571ded4: 1c c4 03 64 f8 02 00 64 10 df 71 65 ec de 71 65 ...d...d..qe..qe<br>6571dee4: 84 da 01 f8 5c fb 16 f8 00 4e 40 00 00 00 00 00 ....\....N@.....<br>6571def4: 00 4e 40 00 00 00 00 00 d3 00 00 00 ec 4e 40 00 .N@..........N@.<br>6571df04: d4 df 71 65 14 df 71 65 e0 db 01 f8 c0 d9 01 f8 ..qe..qe........<br>6571df14: a8 cb 03 64 e0 ba 03 64 01 00 01 00 00 00 00 00 ...d...d........<br>6571df24: 00 00 00 00 d4 4e 40 00 00 00 00 30 40 00 00 00 .....N@....0@...<br>6571df34: 13 00 00 60 98 df 71 65 48 df 71 65 f4 81 00 f8 ...`..qeH.qe....<br>6571df44: 8c 7a 00 f8 68 df 71 65 58 df 71 65 6c df 71 65 .z..h.qeX.qel.qe<br>6571df54: 60 df 71 65 0c 2b 00 f8 bc 2a 00 f8 84 df 71 65 `.qe.+...*....qe<br>6571df64: 70 df 71 65 e4 7d 04 f8 08 2b 00 f8 0d 00 00 00 p.qe.}...+......<br>6571df74: 0a 00 00 30 40 00 00 00 54 65 73 74 44 6d 61 53 ...0@...TestDmaS<br>6571df84: 69 6d 04 f8 a9 4b 40 00 b8 df 71 65 9c df 71 65 im...K@...qe..qe<br>6571df94: 2c be 00 f8 2c bd 00 f8 38 4c 40 0d 01 00 00 00 ,...,...8L@.....<br>6571dfa4: 00 00 00 00 84 2d 02 f8 d4 df 71 65 bc df 71 65 .....-....qe..qe<br>6571dfb4: b8 2d 02 f8 dc bd 00 f8 54 a4 00 f8 00 00 00 00 .-......T.......<br>6571dfc4: ac da 01 f8 10 00 00 60 d8 df 71 65 70 74 00 f8 .......`..qept..<br>6571dfd4: b8 da 01 f8 d4 4e 40 00 20 f7 16 f8 d0 4e 40 00 .....N@. ....N@.<br>6571dfe4: 00 00 00 00 00 00 00 00 ec 4e 40 00 40 00 00 00 .........N@.@...</p>
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<p>We can look for potential ROM addresses by scanning the log and
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look up the corresponding function name in the symbol file generated
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<a href="CrashDebuggerUsingMAKSYM-Ref.guide.html">using the MAKSYM tool</a> . The first
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one is 0xF8170414 at offset 4 in the memory dump.
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</p>
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</li>
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<li>
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<p>Alternatively, we can use the printsym.pl perl
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script, passing it the dump output. The following is part of the output:</p>
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<p class="CodeBlock">R:\base\e32\rombuild&gt;perl -S printsym.pl ASSABETARM4D.symbol<br>ROM Symbols from ASSABETARM4D.symbol<br>Please enter data to be decoded<br>6571de54: 07 00 00 10 14 04 17 f8 00 00 00 00 d4 4e 40 00 .............N@.<br>= 10000007 ....&nbsp;<br>= f8170414 ....  etext=. + 0x0<br>= 00000000 ....<br>= 00404ed4 .N@.<br>6571de64: e8 de 71 65 74 de 71 65 74 fb 16 f8 88 28 03 f8 ..qet.qet....(..<br>= 6571dee8 ..qe<br>= 6571de74 t.qe<br>= f816fb74 t...  DDmaTestChannel::DoCreate(int, TDesC8 const *, TVersion const &amp;<br>) + 0x24<br>= f8032888 .(..  Kern::Fault(char const *, int) + 0xc<br>6571de74: 0c d4 03 f8 64 35 03 f8 00 00 00 00 00 00 00 00 ....d5..........<br>= f803d40c ....  RHeap::Alloc(int) + 0xf4<br>= f8033564 d5..  Kern::MutexSignal(DMutex &amp;) + 0xc<br>= 00000000 ....<br>= 00000000 ....<br><br>[............ truncated ...............]<br><br>= f801da84 ....  DLogicalDevice::ChannelCreate(DLogicalChannelBase *&amp;, TChannelC<br>reateInfo &amp;) + 0xd0<br>= f816fb5c \...  DDmaTestChannel::DoCreate(int, TDesC8 const *, TVersion const &amp;<br>) + 0xc<br>= 00404e00 .N@.<br>= 00000000 ....<br>6571def4: 00 4e 40 00 00 00 00 00 d3 00 00 00 ec 4e 40 00 .N@..........N@.<br>= 00404e00 .N@.<br>= 00000000 ....<br>= 000000d3 ....<br>= 00404eec .N@.<br>6571df04: d4 df 71 65 14 df 71 65 e0 db 01 f8 c0 d9 01 f8 ..qe..qe........<br>= 6571dfd4 ..qe<br>= 6571df14 ..qe<br>= f801dbe0 ....  ExecHandler::ChannelCreate(TDesC8 const &amp;, TChannelCreateInfo &amp;<br>, int) + 0x134<br>= f801d9c0 ....  DLogicalDevice::ChannelCreate(DLogicalChannelBase *&amp;, TChannelC<br>reateInfo &amp;) + 0xc<br><br>[.......................... truncated .........................]<br><br>= f8022db8 .-..  ExecHandler::DebugPrint(void *, int) + 0x34<br>= f800bddc ....  A::UserDebugPrint(unsigned char const *, int, int) + 0xc<br>= f800a454 T...  EpocSlowExecTable + 0xc<br>= 00000000 ....<br>6571dfc4: ac da 01 f8 10 00 00 60 d8 df 71 65 70 74 00 f8 .......`..qept..<br>= f801daac ....  ExecHandler::ChannelCreate(TDesC8 const &amp;, TChannelCreateInfo &amp;<br>, int) + 0x0<br>= 60000010 ...`<br>= 6571dfd8 ..qe<br>= f8007470 pt..  __ArmVectorSwi + 0xd8<br>6571dfd4: b8 da 01 f8 d4 4e 40 00 20 f7 16 f8 d0 4e 40 00 .....N@. ....N@.<br>= f801dab8 ....  ExecHandler::ChannelCreate(TDesC8 const &amp;, TChannelCreateInfo &amp;<br>, int) + 0xc<br>= 00404ed4 .N@.<br>= f816f720  ...  etext=. + 0x560<br>= 00404ed0 .N@.<br>6571dfe4: 00 00 00 00 00 00 00 00 ec 4e 40 00 40 00 00 00 .........N@.@...<br>= 00000000 ....<br>= 00000000 ....<br>= 00404eec .N@.<br>= 00000040 @...<br>^C<br>R:\base\e32\rombuild&gt;</p>
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<p>There are several false positives in this output (and even more
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in the truncated parts). So some study of the source code is needed to discard
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the noise and find the actual call stack. Here it is (innermost frame
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first):</p>
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<ul>
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<li>
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<p>Kern::Fault</p>
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</li>
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<p>DDmaTestChannel::DoCreate</p>
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</li>
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<li>
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<p>ExecHandler::ChannelCreate</p>
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</li>
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<li>
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<p> __ArmVectorSwi</p>
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</li>
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</ul>
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<p>Note that for the sake of the example, a call to Kern::Fault() was deliberately inserted into
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DDmaTestChannel::DoCreate().</p>
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<p>All other function names are false positives and should be
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ignored</p>
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</ul>
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<h5>Related tasks</h5>
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<ul>
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  <li><a href="CrashDebuggerCallStack.guide02.html">General Points</a></li>
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  <li><a href="CrashDebuggerCallStack.guide03.html">Finding the Stack</a></li>
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  <li><a href="CrashDebuggerCallStack.guide05.html">Walking through the Call Stack</a></li>
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</ul>
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<div id="footer">Copyright &copy; 2010 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. <br>License: <a href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a></div>
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	   </div>
FCL/sftools/dev/ide/carbidecpp