--- /dev/null
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+<HTML
+><HEAD
+><TITLE
+>Debugging Techniques</TITLE
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+NAME="GENERATOR"
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+TITLE="eCos User Guide"
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+REL="UP"
+TITLE="eCos Programming Concepts and Techniques"
+HREF="ecos-programming-concepts-and-techniques.html"><LINK
+REL="PREVIOUS"
+TITLE="Compiling a C++ Application"
+HREF="compiling-cpp-app.html"><LINK
+REL="NEXT"
+TITLE="Kernel Instrumentation"
+HREF="kernel-instrumentation.html"></HEAD
+><BODY
+CLASS="CHAPTER"
+BGCOLOR="#FFFFFF"
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+VLINK="#840084"
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+SUMMARY="Header navigation table"
+WIDTH="100%"
+BORDER="0"
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+><TH
+COLSPAN="3"
+ALIGN="center"
+>eCos User Guide</TH
+></TR
+><TR
+><TD
+WIDTH="10%"
+ALIGN="left"
+VALIGN="bottom"
+><A
+HREF="compiling-cpp-app.html"
+ACCESSKEY="P"
+>Prev</A
+></TD
+><TD
+WIDTH="80%"
+ALIGN="center"
+VALIGN="bottom"
+></TD
+><TD
+WIDTH="10%"
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+VALIGN="bottom"
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+HREF="kernel-instrumentation.html"
+ACCESSKEY="N"
+>Next</A
+></TD
+></TR
+></TABLE
+><HR
+ALIGN="LEFT"
+WIDTH="100%"></DIV
+><DIV
+CLASS="CHAPTER"
+><H1
+><A
+NAME="DEBUGGING-TECHNIQUES">Chapter 27. Debugging Techniques</H1
+><DIV
+CLASS="TOC"
+><DL
+><DT
+><B
+>Table of Contents</B
+></DT
+><DT
+><A
+HREF="debugging-techniques.html#TRACING"
+>Tracing</A
+></DT
+><DT
+><A
+HREF="kernel-instrumentation.html"
+>Kernel Instrumentation</A
+></DT
+></DL
+></DIV
+><P
+><SPAN
+CLASS="PRODUCTNAME"
+>eCos</SPAN
+> applications and components can be debugged in
+ traditional ways, with printing statements and debugger
+ single-stepping, but there are situations in which these
+ techniques cannot be used. One example of this is when a
+ program is getting data at a high rate from a real-time
+ source, and cannot be slowed down or interrupted.</P
+><P
+><SPAN
+CLASS="PRODUCTNAME"
+>eCos</SPAN
+>’s infrastructure module provides a
+ <SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>tracing</I
+></SPAN
+> formalism, allowing the
+ kernel’s tracing macros to be configured in many useful
+ ways. <SPAN
+CLASS="PRODUCTNAME"
+>eCos</SPAN
+>’s kernel provides <I
+CLASS="FIRSTTERM"
+>instrumentation
+ buffers</I
+> which also collect specific
+ (configurable) data about the system’s history and
+ performance.</P
+><DIV
+CLASS="SECT1"
+><H1
+CLASS="SECT1"
+><A
+NAME="TRACING">Tracing</H1
+><P
+>To use <SPAN
+CLASS="PRODUCTNAME"
+>eCos</SPAN
+>’s tracing facilities you must first
+ configure your system to use <I
+CLASS="FIRSTTERM"
+>tracing</I
+>.
+ You should enable the Asserts and Tracing component
+ (<TT
+CLASS="OPTION"
+>CYGPKG_INFRA_DEBUG</TT
+>) and the
+ <TT
+CLASS="OPTION"
+>Use tracing</TT
+> component within it
+ (<TT
+CLASS="OPTION"
+>CYGDBG_USE_TRACING</TT
+>). These
+ options can be enabled with the <SPAN
+CLASS="APPLICATION"
+>Configuration
+ Tool</SPAN
+> or by editing the file
+ <TT
+CLASS="FILENAME"
+><TT
+CLASS="REPLACEABLE"
+><I
+>BUILD_DIR</I
+></TT
+>/pkgconf/infra.h
+ </TT
+> manually.</P
+><P
+>You should then examine all the tracing-related options in
+the <I
+CLASS="CITETITLE"
+>Package: Infrastructure</I
+> chapter of the <I
+CLASS="CITETITLE"
+><SPAN
+CLASS="PRODUCTNAME"
+>eCos</SPAN
+> Reference
+Manual</I
+>. One useful set of configuration options are: <TT
+CLASS="LITERAL"
+>CYGDBG_INFRA_DEBUG_FUNCTION_REPORTS</TT
+> and <TT
+CLASS="LITERAL"
+>CYGDBG_INFRA_DEBUG_TRACE_MESSAGE</TT
+>,
+which are both enabled by default when tracing is enabled.</P
+><P
+>The following “Hello world with tracing” shows
+the output from running the hello world program (from <A
+HREF="building-and-running-sample-appliations.html#ECOS-HELLO-WORLD"
+>the Section called <I
+><SPAN
+CLASS="PRODUCTNAME"
+>eCos</SPAN
+> Hello World</I
+> in Chapter 13</A
+>) that was
+built with tracing enabled: </P
+><DIV
+CLASS="EXAMPLE"
+><A
+NAME="AEN2289"><P
+><B
+>Example 27-1. Hello world with tracing</B
+></P
+><TABLE
+BORDER="5"
+BGCOLOR="#E0E0F0"
+WIDTH="70%"
+><TR
+><TD
+><PRE
+CLASS="SCREEN"
+>$ mips-tx39-elf-run --board=jmr3904 hello
+Hello, eCos world!
+ASSERT FAIL: <2>cyg_trac.h [ 623] Cyg_TraceFunction_Report_::set_exitvoid() exitvoid used in typed function
+TRACE: <1>mlqueue.cxx [ 395] Cyg_ThreadQueue_Implementation::enqueue() {{enter
+TRACE: <1>mlqueue.cxx [ 395] Cyg_ThreadQueue_Implementation::enqueue() }}RETURNING UNSET!
+TRACE: <1>mlqueue.cxx [ 126] Cyg_Scheduler_Implementation::add_thread() }}RETURNING UNSET!
+TRACE: <1>thread.cxx [ 654] Cyg_Thread::resume() }}return void
+TRACE: <1>cstartup.cxx [ 160] cyg_iso_c_start() }}return void
+TRACE: <1>startup.cxx [ 142] cyg_package_start() }}return void
+TRACE: <1>startup.cxx [ 150] cyg_user_start() {{enter
+TRACE: <1>startup.cxx [ 150] cyg_user_start() (((void)))
+TRACE: <1>startup.cxx [ 153] cyg_user_start() 'This is the system default cyg_user_start()'
+TRACE: <1>startup.cxx [ 157] cyg_user_start() }}return void
+TRACE: <1>sched.cxx [ 212] Cyg_Scheduler::start() {{enter
+TRACE: <1>mlqueue.cxx [ 102] Cyg_Scheduler_Implementation::schedule() {{enter
+TRACE: <1>mlqueue.cxx [ 437] Cyg_ThreadQueue_Implementation::highpri() {{enter
+TRACE: <1>mlqueue.cxx [ 437] Cyg_ThreadQueue_Implementation::highpri() }}RETURNING UNSET!
+TRACE: <1>mlqueue.cxx [ 102] Cyg_Scheduler_Implementation::schedule() }}RETURNING UNSET!
+TRACE: <2>intr.cxx [ 450] Cyg_Interrupt::enable_interrupts() {{enter
+TRACE: <2>intr.cxx [ 450] Cyg_Interrupt::enable_interrupts() }}RETURNING UNSET!
+TRACE: <2>thread.cxx [ 69] Cyg_HardwareThread::thread_entry() {{enter
+TRACE: <2>cstartup.cxx [ 127] invoke_main() {{enter
+TRACE: <2>cstartup.cxx [ 127] invoke_main() ((argument is ignored))
+TRACE: <2>dummyxxmain.cxx [ 60] __main() {{enter
+TRACE: <2>dummyxxmain.cxx [ 60] __main() (((void)))
+TRACE: <2>dummyxxmain.cxx [ 63] __main() 'This is the system default __main()'
+TRACE: <2>dummyxxmain.cxx [ 67] __main() }}return void
+TRACE: <2>memcpy.c [ 112] _memcpy() {{enter
+TRACE: <2>memcpy.c [ 112] _memcpy() ((dst=80002804, src=BFC14E58, n=19))
+TRACE: <2>memcpy.c [ 164] _memcpy() }}returning 80002804
+TRACE: <2>cstartup.cxx [ 137] invoke_main() 'main() has returned with code 0. Calling exit()'
+TRACE: <2>exit.cxx [ 71] __libc_exit() {{enter
+TRACE: <2>exit.cxx [ 71] __libc_exit() ((status=0 ))
+TRACE: <2>atexit.cxx [ 84] cyg_libc_invoke_atexit_handlers() {{enter
+TRACE: <2>atexit.cxx [ 84] cyg_libc_invoke_atexit_handlers() (((void)))
+
+Scheduler:
+
+Lock: 0
+Current Thread: <null>
+
+Threads:
+
+Idle Thread pri = 31 state = R id = 1
+ stack base = 800021F0 ptr = 80002510 size = 00000400
+ sleep reason NONE wake reason NONE
+ queue = 80000C54 wait info = 00000000
+
+<null> pri = 0 state = R id = 2
+ stack base = 80002A48 ptr = 8000A968 size = 00008000
+ sleep reason NONE wake reason NONE
+ queue = 80000BD8 wait info = 00000000
+ </PRE
+></TD
+></TR
+></TABLE
+></DIV
+></DIV
+></DIV
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