119 lines
4.7 KiB
HTML
119 lines
4.7 KiB
HTML
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<title>MSP430 Profiling Capability - Using as</title>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html">
|
||
|
|
<meta name="description" content="Using as">
|
||
|
|
<meta name="generator" content="makeinfo 4.7">
|
||
|
|
<link title="Top" rel="start" href="index.html#Top">
|
||
|
|
<link rel="up" href="MSP430_002dDependent.html#MSP430_002dDependent" title="MSP430-Dependent">
|
||
|
|
<link rel="prev" href="MSP430-Opcodes.html#MSP430-Opcodes" title="MSP430 Opcodes">
|
||
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
||
|
|
<!--
|
||
|
|
This file documents the GNU Assembler "as".
|
||
|
|
|
||
|
|
Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
|
||
|
|
2006, 2007 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 1.1
|
||
|
|
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''.
|
||
|
|
|
||
|
|
man end-->
|
||
|
|
<meta http-equiv="Content-Style-Type" content="text/css">
|
||
|
|
<style type="text/css"><!--
|
||
|
|
pre.display { font-family:inherit }
|
||
|
|
pre.format { font-family:inherit }
|
||
|
|
pre.smalldisplay { font-family:inherit; font-size:smaller }
|
||
|
|
pre.smallformat { font-family:inherit; font-size:smaller }
|
||
|
|
pre.smallexample { font-size:smaller }
|
||
|
|
pre.smalllisp { font-size:smaller }
|
||
|
|
span.sc { font-variant:small-caps }
|
||
|
|
span.roman { font-family: serif; font-weight: normal; }
|
||
|
|
--></style>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<div class="node">
|
||
|
|
<p>
|
||
|
|
<a name="MSP430-Profiling-Capability"></a>Previous: <a rel="previous" accesskey="p" href="MSP430-Opcodes.html#MSP430-Opcodes">MSP430 Opcodes</a>,
|
||
|
|
Up: <a rel="up" accesskey="u" href="MSP430_002dDependent.html#MSP430_002dDependent">MSP430-Dependent</a>
|
||
|
|
<hr><br>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<h4 class="subsection">9.24.6 Profiling Capability</h4>
|
||
|
|
|
||
|
|
<p><a name="index-MSP-430-profiling-capability-1342"></a><a name="index-profiling-capability-for-MSP-430-1343"></a>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>We define new section <span class="samp">.profiler</span> which holds all profiling information.
|
||
|
|
We define new pseudo operation <span class="samp">.profiler</span> which will instruct assembler to
|
||
|
|
add new profile entry to the object file. Profile should take place at the
|
||
|
|
present address.
|
||
|
|
|
||
|
|
<p>Pseudo operation format:
|
||
|
|
|
||
|
|
<p><span class="samp">.profiler flags,function_to_profile [, cycle_corrector, extra]</span>
|
||
|
|
|
||
|
|
<p>where:
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dl>
|
||
|
|
<span class="samp">flags</span> is a combination of the following characters:
|
||
|
|
|
||
|
|
<dt><code>s</code><dd>function entry
|
||
|
|
<br><dt><code>x</code><dd>function exit
|
||
|
|
<br><dt><code>i</code><dd>function is in init section
|
||
|
|
<br><dt><code>f</code><dd>function is in fini section
|
||
|
|
<br><dt><code>l</code><dd>library call
|
||
|
|
<br><dt><code>c</code><dd>libc standard call
|
||
|
|
<br><dt><code>d</code><dd>stack value demand
|
||
|
|
<br><dt><code>I</code><dd>interrupt service routine
|
||
|
|
<br><dt><code>P</code><dd>prologue start
|
||
|
|
<br><dt><code>p</code><dd>prologue end
|
||
|
|
<br><dt><code>E</code><dd>epilogue start
|
||
|
|
<br><dt><code>e</code><dd>epilogue end
|
||
|
|
<br><dt><code>j</code><dd>long jump / sjlj unwind
|
||
|
|
<br><dt><code>a</code><dd>an arbitrary code fragment
|
||
|
|
<br><dt><code>t</code><dd>extra parameter saved (a constant value like frame size)
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<br><dt><code>function_to_profile</code><dd>a function address
|
||
|
|
<br><dt><code>cycle_corrector</code><dd>a value which should be added to the cycle counter, zero if omitted.
|
||
|
|
<br><dt><code>extra</code><dd>any extra parameter, zero if omitted.
|
||
|
|
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<p>For example:
|
||
|
|
<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>
|
||
|
|
<!-- Copyright 2001, 2002 Free Software Foundation, Inc. -->
|
||
|
|
<!-- This is part of the GAS manual. -->
|
||
|
|
<!-- For copying conditions, see the file as.texinfo. -->
|
||
|
|
</body></html>
|
||
|
|
|