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toolchain-gcc-arm-embedded/share/doc/gcc-arm-none-eabi/html/as.html/MSP430-Profiling-Capability...

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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

  2. <html>

  3. <!-- This file documents the GNU Assembler "as".

  4. 

  5. Copyright (C) 1991-2020 Free Software Foundation, Inc.

  6. 

  7. Permission is granted to copy, distribute and/or modify this document

  8. under the terms of the GNU Free Documentation License, Version 1.3

  9. or any later version published by the Free Software Foundation;

  10. with no Invariant Sections, with no Front-Cover Texts, and with no

  11. Back-Cover Texts.  A copy of the license is included in the

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  13.  -->

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  15. <head>

  16. <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

  17. <title>MSP430 Profiling Capability (Using as)</title>

  18. 

  19. <meta name="description" content="MSP430 Profiling Capability (Using as)">

  20. <meta name="keywords" content="MSP430 Profiling Capability (Using as)">

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  24. <link href="index.html#Top" rel="start" title="Top">

  25. <link href="AS-Index.html#AS-Index" rel="index" title="AS Index">

  26. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  27. <link href="MSP430_002dDependent.html#MSP430_002dDependent" rel="up" title="MSP430-Dependent">

  28. <link href="NDS32_002dDependent.html#NDS32_002dDependent" rel="next" title="NDS32-Dependent">

  29. <link href="MSP430-Opcodes.html#MSP430-Opcodes" rel="prev" title="MSP430 Opcodes">

  30. <style type="text/css">

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  57. 

  58. 

  59. </head>

  60. 

  61. <body lang="en">

  62. <a name="MSP430-Profiling-Capability"></a>

  63. <div class="header">

  64. <p>

  65. 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> &nbsp; [<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>

  66. </div>

  67. <hr>

  68. <a name="Profiling-Capability"></a>

  69. <h4 class="subsection">9.29.6 Profiling Capability</h4>

  70. 

  71. <a name="index-MSP-430-profiling-capability"></a>

  72. <a name="index-profiling-capability-for-MSP-430"></a>

  73. <p>It is a performance hit to use gcc&rsquo;s profiling approach for this tiny target.

  74. Even more &ndash; jtag hardware facility does not perform any profiling functions.

  75. However we&rsquo;ve got gdb&rsquo;s built-in simulator where we can do anything.

  76. </p>

  77. <p>We define new section &lsquo;<samp>.profiler</samp>&rsquo; which holds all profiling information.

  78. We define new pseudo operation &lsquo;<samp>.profiler</samp>&rsquo; which will instruct assembler to

  79. add new profile entry to the object file. Profile should take place at the

  80. present address.

  81. </p>

  82. <p>Pseudo operation format:

  83. </p>

  84. <p>&lsquo;<samp>.profiler flags,function_to_profile [, cycle_corrector, extra]</samp>&rsquo;

  85. </p>

  86. 

  87. <p>where:

  88. </p>

  89. <dl compact="compact">

  90. <dd>

  91. <dl compact="compact">

  92. <dd>

  93. <p>&lsquo;<samp>flags</samp>&rsquo; is a combination of the following characters:

  94. </p>

  95. </dd>

  96. <dt><code>s</code></dt>

  97. <dd><p>function entry

  98. </p></dd>

  99. <dt><code>x</code></dt>

  100. <dd><p>function exit

  101. </p></dd>

  102. <dt><code>i</code></dt>

  103. <dd><p>function is in init section

  104. </p></dd>

  105. <dt><code>f</code></dt>

  106. <dd><p>function is in fini section

  107. </p></dd>

  108. <dt><code>l</code></dt>

  109. <dd><p>library call

  110. </p></dd>

  111. <dt><code>c</code></dt>

  112. <dd><p>libc standard call

  113. </p></dd>

  114. <dt><code>d</code></dt>

  115. <dd><p>stack value demand

  116. </p></dd>

  117. <dt><code>I</code></dt>

  118. <dd><p>interrupt service routine

  119. </p></dd>

  120. <dt><code>P</code></dt>

  121. <dd><p>prologue start

  122. </p></dd>

  123. <dt><code>p</code></dt>

  124. <dd><p>prologue end

  125. </p></dd>

  126. <dt><code>E</code></dt>

  127. <dd><p>epilogue start

  128. </p></dd>

  129. <dt><code>e</code></dt>

  130. <dd><p>epilogue end

  131. </p></dd>

  132. <dt><code>j</code></dt>

  133. <dd><p>long jump / sjlj unwind

  134. </p></dd>

  135. <dt><code>a</code></dt>

  136. <dd><p>an arbitrary code fragment

  137. </p></dd>

  138. <dt><code>t</code></dt>

  139. <dd><p>extra parameter saved (a constant value like frame size)

  140. </p></dd>

  141. </dl>

  142. 

  143. </dd>

  144. <dt><code>function_to_profile</code></dt>

  145. <dd><p>a function address

  146. </p></dd>

  147. <dt><code>cycle_corrector</code></dt>

  148. <dd><p>a value which should be added to the cycle counter, zero if omitted.

  149. </p></dd>

  150. <dt><code>extra</code></dt>

  151. <dd><p>any extra parameter, zero if omitted.

  152. </p>

  153. </dd>

  154. </dl>

  155. 

  156. <p>For example:

  157. </p><div class="smallexample">

  158. <pre class="smallexample">.global fxx

  159. .type fxx,@function

  160. fxx:

  161. .LFrameOffset_fxx=0x08

  162. .profiler &quot;scdP&quot;, fxx     ; function entry.

  163. 			  ; we also demand stack value to be saved

  164.   push r11

  165.   push r10

  166.   push r9

  167.   push r8

  168. .profiler &quot;cdpt&quot;,fxx,0, .LFrameOffset_fxx  ; check stack value at this point

  169. 					  ; (this is a prologue end)

  170. 					  ; note, that spare var filled with

  171. 					  ; the farme size

  172.   mov r15,r8

  173. ...

  174. .profiler cdE,fxx         ; check stack

  175.   pop r8

  176.   pop r9

  177.   pop r10

  178.   pop r11

  179. .profiler xcde,fxx,3      ; exit adds 3 to the cycle counter

  180.   ret                     ; cause 'ret' insn takes 3 cycles

  181. </pre></div>

  182. 

  183. 

  184. <hr>

  185. <div class="header">

  186. <p>

  187. 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> &nbsp; [<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>

  188. </div>

  189. 

  190. 

  191. 

  192. </body>

  193. </html>