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><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
>&#8217;s infrastructure module provides a
        <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>tracing</I
></SPAN
> formalism, allowing the
        kernel&#8217;s tracing macros to be configured in many useful
        ways. <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
>&#8217;s kernel provides <I
CLASS="FIRSTTERM"
>instrumentation
          buffers</I
> which also collect specific
        (configurable) data about the system&#8217;s history and
        performance.</P
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="TRACING">Tracing</H1
><P
>To use <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
>&#8217;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 &#8220;Hello world with tracing&#8221; 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: &lt;2&gt;cyg_trac.h          [ 623] Cyg_TraceFunction_Report_::set_exitvoid()                                                            exitvoid used in typed function
TRACE: &lt;1&gt;mlqueue.cxx         [ 395] Cyg_ThreadQueue_Implementation::enqueue()                                                            {{enter
TRACE: &lt;1&gt;mlqueue.cxx         [ 395] Cyg_ThreadQueue_Implementation::enqueue()                                                            }}RETURNING UNSET!
TRACE: &lt;1&gt;mlqueue.cxx         [ 126] Cyg_Scheduler_Implementation::add_thread()                                                           }}RETURNING UNSET!
TRACE: &lt;1&gt;thread.cxx          [ 654] Cyg_Thread::resume()                                                                                 }}return void
TRACE: &lt;1&gt;cstartup.cxx        [ 160] cyg_iso_c_start()                                                                                    }}return void
TRACE: &lt;1&gt;startup.cxx         [ 142] cyg_package_start()                                                                                  }}return void
TRACE: &lt;1&gt;startup.cxx         [ 150] cyg_user_start()                                                                                     {{enter
TRACE: &lt;1&gt;startup.cxx         [ 150] cyg_user_start()                                                                                     (((void)))
TRACE: &lt;1&gt;startup.cxx         [ 153] cyg_user_start()                                                                                     'This is the system default cyg_user_start()'
TRACE: &lt;1&gt;startup.cxx         [ 157] cyg_user_start()                                                                                     }}return void
TRACE: &lt;1&gt;sched.cxx           [ 212] Cyg_Scheduler::start()                                                                               {{enter
TRACE: &lt;1&gt;mlqueue.cxx         [ 102] Cyg_Scheduler_Implementation::schedule()                                                             {{enter
TRACE: &lt;1&gt;mlqueue.cxx         [ 437] Cyg_ThreadQueue_Implementation::highpri()                                                            {{enter
TRACE: &lt;1&gt;mlqueue.cxx         [ 437] Cyg_ThreadQueue_Implementation::highpri()                                                            }}RETURNING UNSET!
TRACE: &lt;1&gt;mlqueue.cxx         [ 102] Cyg_Scheduler_Implementation::schedule()                                                             }}RETURNING UNSET!
TRACE: &lt;2&gt;intr.cxx            [ 450] Cyg_Interrupt::enable_interrupts()                                                                   {{enter
TRACE: &lt;2&gt;intr.cxx            [ 450] Cyg_Interrupt::enable_interrupts()                                                                   }}RETURNING UNSET!
TRACE: &lt;2&gt;thread.cxx          [  69] Cyg_HardwareThread::thread_entry()                                                                   {{enter
TRACE: &lt;2&gt;cstartup.cxx        [ 127] invoke_main()                                                                                        {{enter
TRACE: &lt;2&gt;cstartup.cxx        [ 127] invoke_main()                                                                                        ((argument is ignored))
TRACE: &lt;2&gt;dummyxxmain.cxx     [  60] __main()                                                                                             {{enter
TRACE: &lt;2&gt;dummyxxmain.cxx     [  60] __main()                                                                                             (((void)))
TRACE: &lt;2&gt;dummyxxmain.cxx     [  63] __main()                                                                                             'This is the system default __main()'
TRACE: &lt;2&gt;dummyxxmain.cxx     [  67] __main()                                                                                             }}return void
TRACE: &lt;2&gt;memcpy.c            [ 112] _memcpy()                                                                                            {{enter
TRACE: &lt;2&gt;memcpy.c            [ 112] _memcpy()                                                                                            ((dst=80002804, src=BFC14E58, n=19))
TRACE: &lt;2&gt;memcpy.c            [ 164] _memcpy()                                                                                            }}returning 80002804
TRACE: &lt;2&gt;cstartup.cxx        [ 137] invoke_main()                                                                                        'main() has returned with code 0. Calling exit()'
TRACE: &lt;2&gt;exit.cxx            [  71] __libc_exit()                                                                                        {{enter
TRACE: &lt;2&gt;exit.cxx            [  71] __libc_exit()                                                                                        ((status=0 ))
TRACE: &lt;2&gt;atexit.cxx          [  84] cyg_libc_invoke_atexit_handlers()                                                                    {{enter
TRACE: &lt;2&gt;atexit.cxx          [  84] cyg_libc_invoke_atexit_handlers()                                                                      (((void)))
 
Scheduler:
 
Lock:                0
Current Thread:      &lt;null&gt;
 
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
 
&lt;null&gt;               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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11			`><TITLE`
12			`>Debugging Techniques</TITLE`
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23			`HREF="ecos-programming-concepts-and-techniques.html"><LINK`
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25			`TITLE="Compiling a C++ Application"`
26			`HREF="compiling-cpp-app.html"><LINK`
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49			`>eCos User Guide</TH`
50			`></TR`
51			`><TR`
52			`><TD`
53			`WIDTH="10%"`
54			`ALIGN="left"`
55			`VALIGN="bottom"`
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79			`WIDTH="100%"></DIV`
80			`><DIV`
81			`CLASS="CHAPTER"`
82			`><H1`
83			`><A`
84			`NAME="DEBUGGING-TECHNIQUES">Chapter 27. Debugging Techniques</H1`
85			`><DIV`
86			`CLASS="TOC"`
87			`><DL`
88			`><DT`
89			`><B`
90			`>Table of Contents</B`
91			`></DT`
92			`><DT`
93			`><A`
94			`HREF="debugging-techniques.html#TRACING"`
95			`>Tracing</A`
96			`></DT`
97			`><DT`
98			`><A`
99			`HREF="kernel-instrumentation.html"`
100			`>Kernel Instrumentation</A`
101			`></DT`
102			`></DL`
103			`></DIV`
104			`><P`
105			`><SPAN`
106			`CLASS="PRODUCTNAME"`
107			`>eCos</SPAN`
108			`> applications and components can be debugged in`
109			`traditional ways, with printing statements and debugger`
110			`single-stepping, but there are situations in which these`
111			`techniques cannot be used. One example of this is when a`
112			`program is getting data at a high rate from a real-time`
113			`source, and cannot be slowed down or interrupted.</P`
114			`><P`
115			`><SPAN`
116			`CLASS="PRODUCTNAME"`
117			`>eCos</SPAN`
118			`>’s infrastructure module provides a`
119			`<SPAN`
120			`CLASS="emphasis"`
121			`><I`
122			`CLASS="EMPHASIS"`
123			`>tracing</I`
124			`></SPAN`
125			`> formalism, allowing the`
126			`kernel’s tracing macros to be configured in many useful`
127			`ways. <SPAN`
128			`CLASS="PRODUCTNAME"`
129			`>eCos</SPAN`
130			`>’s kernel provides <I`
131			`CLASS="FIRSTTERM"`
132			`>instrumentation`
133			`buffers</I`
134			`> which also collect specific`
135			`(configurable) data about the system’s history and`
136			`performance.</P`
137			`><DIV`
138			`CLASS="SECT1"`
139			`><H1`
140			`CLASS="SECT1"`
141			`><A`
142			`NAME="TRACING">Tracing</H1`
143			`><P`
144			`>To use <SPAN`
145			`CLASS="PRODUCTNAME"`
146			`>eCos</SPAN`
147			`>’s tracing facilities you must first`
148			`configure your system to use <I`
149			`CLASS="FIRSTTERM"`
150			`>tracing</I`
151			`>.`
152			`You should enable the Asserts and Tracing component`
153			`(<TT`
154			`CLASS="OPTION"`
155			`>CYGPKG_INFRA_DEBUG</TT`
156			`>) and the`
157			`<TT`
158			`CLASS="OPTION"`
159			`>Use tracing</TT`
160			`> component within it`
161			`(<TT`
162			`CLASS="OPTION"`
163			`>CYGDBG_USE_TRACING</TT`
164			`>). These`
165			`options can be enabled with the <SPAN`
166			`CLASS="APPLICATION"`
167			`>Configuration`
168			`Tool</SPAN`
169			`> or by editing the file`
170			`<TT`
171			`CLASS="FILENAME"`
172			`><TT`
173			`CLASS="REPLACEABLE"`
174			`><I`
175			`>BUILD_DIR</I`
176			`></TT`
177			`>/pkgconf/infra.h`
178			`</TT`
179			`> manually.</P`
180			`><P`
181			`>You should then examine all the tracing-related options in`
182			`the <I`
183			`CLASS="CITETITLE"`
184			`>Package: Infrastructure</I`
185			`> chapter of the <I`
186			`CLASS="CITETITLE"`
187			`><SPAN`
188			`CLASS="PRODUCTNAME"`
189			`>eCos</SPAN`
190			`> Reference`
191			`Manual</I`
192			`>. One useful set of configuration options are: <TT`
193			`CLASS="LITERAL"`
194			`>CYGDBG_INFRA_DEBUG_FUNCTION_REPORTS</TT`
195			`> and <TT`
196			`CLASS="LITERAL"`
197			`>CYGDBG_INFRA_DEBUG_TRACE_MESSAGE</TT`
198			`>,`
199			`which are both enabled by default when tracing is enabled.</P`
200			`><P`
201			`>The following “Hello world with tracing” shows`
202			`the output from running the hello world program (from <A`
203			`HREF="building-and-running-sample-appliations.html#ECOS-HELLO-WORLD"`
204			`>the Section called <I`
205			`><SPAN`
206			`CLASS="PRODUCTNAME"`
207			`>eCos</SPAN`
208			`> Hello World</I`
209			`> in Chapter 13</A`
210			`>) that was`
211			`built with tracing enabled: </P`
212			`><DIV`
213			`CLASS="EXAMPLE"`
214			`><A`
215			`NAME="AEN2289"><P`
216			`><B`
217			`>Example 27-1. Hello world with tracing</B`
218			`></P`
219			`><TABLE`
220			`BORDER="5"`
221			`BGCOLOR="#E0E0F0"`
222			`WIDTH="70%"`
223			`><TR`
224			`><TD`
225			`><PRE`
226			`CLASS="SCREEN"`
227			`>$ mips-tx39-elf-run --board=jmr3904 hello`
228			`Hello, eCos world!`
229			`ASSERT FAIL: <2>cyg_trac.h [ 623] Cyg_TraceFunction_Report_::set_exitvoid() exitvoid used in typed function`
230			`TRACE: <1>mlqueue.cxx [ 395] Cyg_ThreadQueue_Implementation::enqueue() {{enter`
231			`TRACE: <1>mlqueue.cxx [ 395] Cyg_ThreadQueue_Implementation::enqueue() }}RETURNING UNSET!`
232			`TRACE: <1>mlqueue.cxx [ 126] Cyg_Scheduler_Implementation::add_thread() }}RETURNING UNSET!`
233			`TRACE: <1>thread.cxx [ 654] Cyg_Thread::resume() }}return void`
234			`TRACE: <1>cstartup.cxx [ 160] cyg_iso_c_start() }}return void`
235			`TRACE: <1>startup.cxx [ 142] cyg_package_start() }}return void`
236			`TRACE: <1>startup.cxx [ 150] cyg_user_start() {{enter`
237			`TRACE: <1>startup.cxx [ 150] cyg_user_start() (((void)))`
238			`TRACE: <1>startup.cxx [ 153] cyg_user_start() 'This is the system default cyg_user_start()'`
239			`TRACE: <1>startup.cxx [ 157] cyg_user_start() }}return void`
240			`TRACE: <1>sched.cxx [ 212] Cyg_Scheduler::start() {{enter`
241			`TRACE: <1>mlqueue.cxx [ 102] Cyg_Scheduler_Implementation::schedule() {{enter`
242			`TRACE: <1>mlqueue.cxx [ 437] Cyg_ThreadQueue_Implementation::highpri() {{enter`
243			`TRACE: <1>mlqueue.cxx [ 437] Cyg_ThreadQueue_Implementation::highpri() }}RETURNING UNSET!`
244			`TRACE: <1>mlqueue.cxx [ 102] Cyg_Scheduler_Implementation::schedule() }}RETURNING UNSET!`
245			`TRACE: <2>intr.cxx [ 450] Cyg_Interrupt::enable_interrupts() {{enter`
246			`TRACE: <2>intr.cxx [ 450] Cyg_Interrupt::enable_interrupts() }}RETURNING UNSET!`
247			`TRACE: <2>thread.cxx [ 69] Cyg_HardwareThread::thread_entry() {{enter`
248			`TRACE: <2>cstartup.cxx [ 127] invoke_main() {{enter`
249			`TRACE: <2>cstartup.cxx [ 127] invoke_main() ((argument is ignored))`
250			`TRACE: <2>dummyxxmain.cxx [ 60] __main() {{enter`
251			`TRACE: <2>dummyxxmain.cxx [ 60] __main() (((void)))`
252			`TRACE: <2>dummyxxmain.cxx [ 63] __main() 'This is the system default __main()'`
253			`TRACE: <2>dummyxxmain.cxx [ 67] __main() }}return void`
254			`TRACE: <2>memcpy.c [ 112] _memcpy() {{enter`
255			`TRACE: <2>memcpy.c [ 112] _memcpy() ((dst=80002804, src=BFC14E58, n=19))`
256			`TRACE: <2>memcpy.c [ 164] _memcpy() }}returning 80002804`
257			`TRACE: <2>cstartup.cxx [ 137] invoke_main() 'main() has returned with code 0. Calling exit()'`
258			`TRACE: <2>exit.cxx [ 71] __libc_exit() {{enter`
259			`TRACE: <2>exit.cxx [ 71] __libc_exit() ((status=0 ))`
260			`TRACE: <2>atexit.cxx [ 84] cyg_libc_invoke_atexit_handlers() {{enter`
261			`TRACE: <2>atexit.cxx [ 84] cyg_libc_invoke_atexit_handlers() (((void)))`
262
263			`Scheduler:`
264
265			`Lock: 0`
266			`Current Thread: <null>`
267
268			`Threads:`
269
270			`Idle Thread pri = 31 state = R id = 1`
271			`stack base = 800021F0 ptr = 80002510 size = 00000400`
272			`sleep reason NONE wake reason NONE`
273			`queue = 80000C54 wait info = 00000000`
274
275			`<null> pri = 0 state = R id = 2`
276			`stack base = 80002A48 ptr = 8000A968 size = 00008000`
277			`sleep reason NONE wake reason NONE`
278			`queue = 80000BD8 wait info = 00000000`
279			`</PRE`
280			`></TD`
281			`></TR`
282			`></TABLE`
283			`></DIV`
284			`></DIV`
285			`></DIV`
286			`><DIV`
287			`CLASS="NAVFOOTER"`
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