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| <title>Using as: MSP430 Profiling Capability</title> |
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| <a name="MSP430-Profiling-Capability"></a> |
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| Previous: <a href="MSP430-Opcodes.html#MSP430-Opcodes" accesskey="p" rel="prev">MSP430 Opcodes</a>, Up: <a href="MSP430_002dDependent.html#MSP430_002dDependent" accesskey="u" rel="up">MSP430-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p> |
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| <a name="Profiling-Capability"></a> |
| <h4 class="subsection">9.29.6 Profiling Capability</h4> |
| |
| <a name="index-MSP-430-profiling-capability"></a> |
| <a name="index-profiling-capability-for-MSP-430"></a> |
| <p>It is a performance hit to use gcc’s profiling approach for this tiny target. |
| Even more – jtag hardware facility does not perform any profiling functions. |
| However we’ve got gdb’s built-in simulator where we can do anything. |
| </p> |
| <p>We define new section ‘<samp>.profiler</samp>’ which holds all profiling information. |
| We define new pseudo operation ‘<samp>.profiler</samp>’ which will instruct assembler to |
| add new profile entry to the object file. Profile should take place at the |
| present address. |
| </p> |
| <p>Pseudo operation format: |
| </p> |
| <p>‘<samp>.profiler flags,function_to_profile [, cycle_corrector, extra]</samp>’ |
| </p> |
| |
| <p>where: |
| </p> |
| <dl compact="compact"> |
| <dd> |
| <dl compact="compact"> |
| <dd> |
| <p>‘<samp>flags</samp>’ is a combination of the following characters: |
| </p> |
| </dd> |
| <dt><code>s</code></dt> |
| <dd><p>function entry |
| </p></dd> |
| <dt><code>x</code></dt> |
| <dd><p>function exit |
| </p></dd> |
| <dt><code>i</code></dt> |
| <dd><p>function is in init section |
| </p></dd> |
| <dt><code>f</code></dt> |
| <dd><p>function is in fini section |
| </p></dd> |
| <dt><code>l</code></dt> |
| <dd><p>library call |
| </p></dd> |
| <dt><code>c</code></dt> |
| <dd><p>libc standard call |
| </p></dd> |
| <dt><code>d</code></dt> |
| <dd><p>stack value demand |
| </p></dd> |
| <dt><code>I</code></dt> |
| <dd><p>interrupt service routine |
| </p></dd> |
| <dt><code>P</code></dt> |
| <dd><p>prologue start |
| </p></dd> |
| <dt><code>p</code></dt> |
| <dd><p>prologue end |
| </p></dd> |
| <dt><code>E</code></dt> |
| <dd><p>epilogue start |
| </p></dd> |
| <dt><code>e</code></dt> |
| <dd><p>epilogue end |
| </p></dd> |
| <dt><code>j</code></dt> |
| <dd><p>long jump / sjlj unwind |
| </p></dd> |
| <dt><code>a</code></dt> |
| <dd><p>an arbitrary code fragment |
| </p></dd> |
| <dt><code>t</code></dt> |
| <dd><p>extra parameter saved (a constant value like frame size) |
| </p></dd> |
| </dl> |
| |
| </dd> |
| <dt><code>function_to_profile</code></dt> |
| <dd><p>a function address |
| </p></dd> |
| <dt><code>cycle_corrector</code></dt> |
| <dd><p>a value which should be added to the cycle counter, zero if omitted. |
| </p></dd> |
| <dt><code>extra</code></dt> |
| <dd><p>any extra parameter, zero if omitted. |
| </p> |
| </dd> |
| </dl> |
| |
| <p>For example: |
| </p><div class="smallexample"> |
| <pre class="smallexample">.global fxx |
| .type fxx,@function |
| fxx: |
| .LFrameOffset_fxx=0x08 |
| .profiler "scdP", fxx ; function entry. |
| ; we also demand stack value to be saved |
| push r11 |
| push r10 |
| push r9 |
| push r8 |
| .profiler "cdpt",fxx,0, .LFrameOffset_fxx ; check stack value at this point |
| ; (this is a prologue end) |
| ; note, that spare var filled with |
| ; the farme size |
| mov r15,r8 |
| ... |
| .profiler cdE,fxx ; check stack |
| pop r8 |
| pop r9 |
| pop r10 |
| pop r11 |
| .profiler xcde,fxx,3 ; exit adds 3 to the cycle counter |
| ret ; cause 'ret' insn takes 3 cycles |
| </pre></div> |
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