<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
<html>
|
<!-- This file documents the GNU Assembler "as".
|
|
Copyright (C) 1991-2021 Free Software Foundation, Inc.
|
|
Permission is granted to copy, distribute and/or modify this document
|
under the terms of the GNU Free Documentation License, Version 1.3
|
or any later version published by the Free Software Foundation;
|
with no Invariant Sections, with no Front-Cover Texts, and with no
|
Back-Cover Texts. A copy of the license is included in the
|
section entitled "GNU Free Documentation License".
|
-->
|
<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ -->
|
<head>
|
<title>Using as: MSP430 Profiling Capability</title>
|
|
<meta name="description" content="Using as: MSP430 Profiling Capability">
|
<meta name="keywords" content="Using as: MSP430 Profiling Capability">
|
<meta name="resource-type" content="document">
|
<meta name="distribution" content="global">
|
<meta name="Generator" content="makeinfo">
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
<link href="index.html#Top" rel="start" title="Top">
|
<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
<link href="MSP430_002dDependent.html#MSP430_002dDependent" rel="up" title="MSP430-Dependent">
|
<link href="NDS32_002dDependent.html#NDS32_002dDependent" rel="next" title="NDS32-Dependent">
|
<link href="MSP430-Opcodes.html#MSP430-Opcodes" rel="previous" title="MSP430 Opcodes">
|
<style type="text/css">
|
<!--
|
a.summary-letter {text-decoration: none}
|
blockquote.smallquotation {font-size: smaller}
|
div.display {margin-left: 3.2em}
|
div.example {margin-left: 3.2em}
|
div.indentedblock {margin-left: 3.2em}
|
div.lisp {margin-left: 3.2em}
|
div.smalldisplay {margin-left: 3.2em}
|
div.smallexample {margin-left: 3.2em}
|
div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
|
div.smalllisp {margin-left: 3.2em}
|
kbd {font-style:oblique}
|
pre.display {font-family: inherit}
|
pre.format {font-family: inherit}
|
pre.menu-comment {font-family: serif}
|
pre.menu-preformatted {font-family: serif}
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
pre.smallexample {font-size: smaller}
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
pre.smalllisp {font-size: smaller}
|
span.nocodebreak {white-space:nowrap}
|
span.nolinebreak {white-space:nowrap}
|
span.roman {font-family:serif; font-weight:normal}
|
span.sansserif {font-family:sans-serif; font-weight:normal}
|
ul.no-bullet {list-style: none}
|
-->
|
</style>
|
|
|
</head>
|
|
<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
|
<a name="MSP430-Profiling-Capability"></a>
|
<div class="header">
|
<p>
|
Previous: <a href="MSP430-Opcodes.html#MSP430-Opcodes" accesskey="p" rel="previous">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>
|
</div>
|
<hr>
|
<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>
|
|
|
<hr>
|
<div class="header">
|
<p>
|
Previous: <a href="MSP430-Opcodes.html#MSP430-Opcodes" accesskey="p" rel="previous">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>
|
</div>
|
|
|
|
</body>
|
</html>
|
