121 lines
4.8 KiB
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121 lines
4.8 KiB
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<title>MSP430 Profiling Capability - Using as</title>
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<meta name="description" content="Using as">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="MSP430_002dDependent.html#MSP430_002dDependent" title="MSP430-Dependent">
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<link rel="prev" href="MSP430-Opcodes.html#MSP430-Opcodes" title="MSP430 Opcodes">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled ``GNU Free Documentation License''.
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</head>
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<body>
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<div class="node">
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<a name="MSP430-Profiling-Capability"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="MSP430-Opcodes.html#MSP430-Opcodes">MSP430 Opcodes</a>,
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Up: <a rel="up" accesskey="u" href="MSP430_002dDependent.html#MSP430_002dDependent">MSP430-Dependent</a>
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<hr>
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</div>
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<h4 class="subsection">9.29.6 Profiling Capability</h4>
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<p><a name="index-MSP-430-profiling-capability-1764"></a><a name="index-profiling-capability-for-MSP-430-1765"></a>It is a performance hit to use gcc's profiling approach for this tiny target.
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Even more – jtag hardware facility does not perform any profiling functions.
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However we've got gdb's built-in simulator where we can do anything.
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<p>We define new section ‘<samp><span class="samp">.profiler</span></samp>’ which holds all profiling information.
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We define new pseudo operation ‘<samp><span class="samp">.profiler</span></samp>’ which will instruct assembler to
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add new profile entry to the object file. Profile should take place at the
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present address.
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<p>Pseudo operation format:
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<p>‘<samp><span class="samp">.profiler flags,function_to_profile [, cycle_corrector, extra]</span></samp>’
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<p>where:
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<dl>
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<dl>
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‘<samp><span class="samp">flags</span></samp>’ is a combination of the following characters:
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<dt><code>s</code><dd>function entry
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<br><dt><code>x</code><dd>function exit
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<br><dt><code>i</code><dd>function is in init section
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<br><dt><code>f</code><dd>function is in fini section
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<br><dt><code>l</code><dd>library call
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<br><dt><code>c</code><dd>libc standard call
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<br><dt><code>d</code><dd>stack value demand
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<br><dt><code>I</code><dd>interrupt service routine
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<br><dt><code>P</code><dd>prologue start
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<br><dt><code>p</code><dd>prologue end
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<br><dt><code>E</code><dd>epilogue start
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<br><dt><code>e</code><dd>epilogue end
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<br><dt><code>j</code><dd>long jump / sjlj unwind
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<br><dt><code>a</code><dd>an arbitrary code fragment
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<br><dt><code>t</code><dd>extra parameter saved (a constant value like frame size)
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</dl>
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<br><dt><code>function_to_profile</code><dd>a function address
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<br><dt><code>cycle_corrector</code><dd>a value which should be added to the cycle counter, zero if omitted.
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<br><dt><code>extra</code><dd>any extra parameter, zero if omitted.
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</dl>
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<p>For example:
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<pre class="smallexample"> .global fxx
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.type fxx,@function
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fxx:
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.LFrameOffset_fxx=0x08
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.profiler "scdP", fxx ; function entry.
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; we also demand stack value to be saved
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push r11
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push r10
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push r9
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push r8
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.profiler "cdpt",fxx,0, .LFrameOffset_fxx ; check stack value at this point
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; (this is a prologue end)
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; note, that spare var filled with
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; the farme size
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mov r15,r8
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...
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.profiler cdE,fxx ; check stack
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pop r8
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pop r9
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pop r10
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pop r11
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.profiler xcde,fxx,3 ; exit adds 3 to the cycle counter
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ret ; cause 'ret' insn takes 3 cycles
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</pre>
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<!-- Copyright (C) 2013-2019 Free Software Foundation, Inc. -->
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<!-- This is part of the GAS manual. -->
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<!-- For copying conditions, see the file as.texinfo. -->
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<!-- man end -->
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</body></html>
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