+++ /dev/null
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->Debugging Techniques</TITLE
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-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
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