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194 lines
6.3 KiB
HTML
194 lines
6.3 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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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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-->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>MSP430 Profiling Capability (Using as)</title>
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<meta name="description" content="MSP430 Profiling Capability (Using as)">
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<meta name="keywords" content="MSP430 Profiling Capability (Using as)">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="MSP430_002dDependent.html#MSP430_002dDependent" rel="up" title="MSP430-Dependent">
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<link href="NDS32_002dDependent.html#NDS32_002dDependent" rel="next" title="NDS32-Dependent">
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<link href="MSP430-Opcodes.html#MSP430-Opcodes" rel="prev" title="MSP430 Opcodes">
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-->
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</style>
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</head>
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<body lang="en">
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<a name="MSP430-Profiling-Capability"></a>
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<div class="header">
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<p>
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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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</div>
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<hr>
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<a name="Profiling-Capability"></a>
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<h4 class="subsection">9.28.6 Profiling Capability</h4>
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<a name="index-MSP-430-profiling-capability"></a>
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<a name="index-profiling-capability-for-MSP-430"></a>
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<p>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>
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<p>We define new section ‘<samp>.profiler</samp>’ which holds all profiling information.
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We define new pseudo operation ‘<samp>.profiler</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>
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<p>Pseudo operation format:
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</p>
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<p>‘<samp>.profiler flags,function_to_profile [, cycle_corrector, extra]</samp>’
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</p>
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<p>where:
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</p>
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<dl compact="compact">
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<dd>
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<dl compact="compact">
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<dd>
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<p>‘<samp>flags</samp>’ is a combination of the following characters:
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</p>
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</dd>
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<dt><code>s</code></dt>
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<dd><p>function entry
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</p></dd>
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<dt><code>x</code></dt>
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<dd><p>function exit
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</p></dd>
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<dt><code>i</code></dt>
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<dd><p>function is in init section
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</p></dd>
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<dt><code>f</code></dt>
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<dd><p>function is in fini section
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</p></dd>
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<dt><code>l</code></dt>
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<dd><p>library call
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</p></dd>
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<dt><code>c</code></dt>
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<dd><p>libc standard call
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</p></dd>
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<dt><code>d</code></dt>
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<dd><p>stack value demand
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</p></dd>
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<dt><code>I</code></dt>
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<dd><p>interrupt service routine
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</p></dd>
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<dt><code>P</code></dt>
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<dd><p>prologue start
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</p></dd>
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<dt><code>p</code></dt>
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<dd><p>prologue end
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</p></dd>
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<dt><code>E</code></dt>
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<dd><p>epilogue start
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</p></dd>
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<dt><code>e</code></dt>
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<dd><p>epilogue end
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</p></dd>
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<dt><code>j</code></dt>
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<dd><p>long jump / sjlj unwind
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</p></dd>
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<dt><code>a</code></dt>
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<dd><p>an arbitrary code fragment
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</p></dd>
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<dt><code>t</code></dt>
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<dd><p>extra parameter saved (a constant value like frame size)
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</p></dd>
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</dl>
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</dd>
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<dt><code>function_to_profile</code></dt>
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<dd><p>a function address
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</p></dd>
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<dt><code>cycle_corrector</code></dt>
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<dd><p>a value which should be added to the cycle counter, zero if omitted.
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</p></dd>
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<dt><code>extra</code></dt>
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<dd><p>any extra parameter, zero if omitted.
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</p>
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</dd>
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</dl>
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<p>For example:
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</p><div class="smallexample">
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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></div>
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<hr>
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<div class="header">
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<p>
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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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</div>
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</body>
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</html>
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