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<title>MIPS (Debugging with GDB)</title>
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="Architectures.html#Architectures" rel="up" title="Architectures">
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<a name="MIPS"></a>
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<div class="header">
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<p>
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Next: <a href="HPPA.html#HPPA" accesskey="n" rel="next">HPPA</a>, Previous: <a href="Alpha.html#Alpha" accesskey="p" rel="prev">Alpha</a>, Up: <a href="Architectures.html#Architectures" accesskey="u" rel="up">Architectures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="MIPS-1"></a>
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<h4 class="subsection">21.4.4 <acronym>MIPS</acronym></h4>
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<a name="index-stack-on-Alpha"></a>
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<a name="index-stack-on-MIPS"></a>
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<a name="index-Alpha-stack"></a>
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<a name="index-MIPS-stack"></a>
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<p>Alpha- and <acronym>MIPS</acronym>-based computers use an unusual stack frame, which
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sometimes requires <small>GDB</small> to search backward in the object code to
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find the beginning of a function.
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</p>
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<a name="index-response-time_002c-MIPS-debugging"></a>
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<p>To improve response time (especially for embedded applications, where
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<small>GDB</small> may be restricted to a slow serial line for this search)
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you may want to limit the size of this search, using one of these
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commands:
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</p>
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<dl compact="compact">
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<dd><a name="index-heuristic_002dfence_002dpost-_0028Alpha_002c-MIPS_0029"></a>
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</dd>
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<dt><code>set heuristic-fence-post <var>limit</var></code></dt>
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<dd><p>Restrict <small>GDB</small> to examining at most <var>limit</var> bytes in its
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search for the beginning of a function. A value of <var>0</var> (the
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default) means there is no limit. However, except for <var>0</var>, the
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larger the limit the more bytes <code>heuristic-fence-post</code> must search
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and therefore the longer it takes to run. You should only need to use
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this command when debugging a stripped executable.
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</p>
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</dd>
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<dt><code>show heuristic-fence-post</code></dt>
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<dd><p>Display the current limit.
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</p></dd>
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</dl>
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<p>These commands are available <em>only</em> when <small>GDB</small> is configured
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for debugging programs on Alpha or <acronym>MIPS</acronym> processors.
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</p>
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<p>Several <acronym>MIPS</acronym>-specific commands are available when debugging <acronym>MIPS</acronym>
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programs:
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</p>
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<dl compact="compact">
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<dt><code>set mips abi <var>arg</var></code></dt>
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<dd><a name="index-set-mips-abi"></a>
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<a name="index-set-ABI-for-MIPS"></a>
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<p>Tell <small>GDB</small> which <acronym>MIPS</acronym> ABI is used by the inferior. Possible
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values of <var>arg</var> are:
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</p>
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<dl compact="compact">
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<dt>‘<samp>auto</samp>’</dt>
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<dd><p>The default ABI associated with the current binary (this is the
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default).
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</p></dd>
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<dt>‘<samp>o32</samp>’</dt>
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<dt>‘<samp>o64</samp>’</dt>
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<dt>‘<samp>n32</samp>’</dt>
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<dt>‘<samp>n64</samp>’</dt>
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<dt>‘<samp>eabi32</samp>’</dt>
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<dt>‘<samp>eabi64</samp>’</dt>
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</dl>
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</dd>
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<dt><code>show mips abi</code></dt>
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<dd><a name="index-show-mips-abi"></a>
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<p>Show the <acronym>MIPS</acronym> ABI used by <small>GDB</small> to debug the inferior.
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</p>
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</dd>
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<dt><code>set mips compression <var>arg</var></code></dt>
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<dd><a name="index-set-mips-compression"></a>
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<a name="index-code-compression_002c-MIPS"></a>
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<p>Tell <small>GDB</small> which <acronym>MIPS</acronym> compressed
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<acronym title="Instruction Set Architecture">ISA</acronym> (Instruction Set Architecture) encoding is used by the
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inferior. <small>GDB</small> uses this for code disassembly and other
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internal interpretation purposes. This setting is only referred to
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when no executable has been associated with the debugging session or
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the executable does not provide information about the encoding it uses.
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Otherwise this setting is automatically updated from information
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provided by the executable.
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</p>
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<p>Possible values of <var>arg</var> are ‘<samp>mips16</samp>’ and ‘<samp>micromips</samp>’.
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The default compressed <acronym title="Instruction Set Architecture">ISA</acronym> encoding is ‘<samp>mips16</samp>’, as
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executables containing <acronym>MIPS16</acronym> code frequently are not
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identified as such.
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</p>
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<p>This setting is “sticky”; that is, it retains its value across
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debugging sessions until reset either explicitly with this command or
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implicitly from an executable.
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</p>
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<p>The compiler and/or assembler typically add symbol table annotations to
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identify functions compiled for the <acronym>MIPS16</acronym> or
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<acronym>microMIPS</acronym> <acronym title="Instruction Set Architecture">ISA</acronym>s. If these function-scope annotations
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are present, <small>GDB</small> uses them in preference to the global
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compressed <acronym title="Instruction Set Architecture">ISA</acronym> encoding setting.
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</p>
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</dd>
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<dt><code>show mips compression</code></dt>
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<dd><a name="index-show-mips-compression"></a>
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<p>Show the <acronym>MIPS</acronym> compressed <acronym title="Instruction Set Architecture">ISA</acronym> encoding used by
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<small>GDB</small> to debug the inferior.
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</p>
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</dd>
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<dt><code>set mipsfpu</code></dt>
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<dt><code>show mipsfpu</code></dt>
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<dd><p>See <a href="MIPS-Embedded.html#MIPS-Embedded">set mipsfpu</a>.
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</p>
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</dd>
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<dt><code>set mips mask-address <var>arg</var></code></dt>
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<dd><a name="index-set-mips-mask_002daddress"></a>
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<a name="index-MIPS-addresses_002c-masking"></a>
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<p>This command determines whether the most-significant 32 bits of 64-bit
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<acronym>MIPS</acronym> addresses are masked off. The argument <var>arg</var> can be
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‘<samp>on</samp>’, ‘<samp>off</samp>’, or ‘<samp>auto</samp>’. The latter is the default
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setting, which lets <small>GDB</small> determine the correct value.
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</p>
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</dd>
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<dt><code>show mips mask-address</code></dt>
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<dd><a name="index-show-mips-mask_002daddress"></a>
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<p>Show whether the upper 32 bits of <acronym>MIPS</acronym> addresses are masked off or
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not.
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</p>
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</dd>
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<dt><code>set remote-mips64-transfers-32bit-regs</code></dt>
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<dd><a name="index-set-remote_002dmips64_002dtransfers_002d32bit_002dregs"></a>
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<p>This command controls compatibility with 64-bit <acronym>MIPS</acronym> targets that
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transfer data in 32-bit quantities. If you have an old <acronym>MIPS</acronym> 64 target
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that transfers 32 bits for some registers, like <small>SR</small> and <small>FSR</small>,
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and 64 bits for other registers, set this option to ‘<samp>on</samp>’.
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</p>
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</dd>
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<dt><code>show remote-mips64-transfers-32bit-regs</code></dt>
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<dd><a name="index-show-remote_002dmips64_002dtransfers_002d32bit_002dregs"></a>
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<p>Show the current setting of compatibility with older <acronym>MIPS</acronym> 64 targets.
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</p>
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</dd>
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<dt><code>set debug mips</code></dt>
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<dd><a name="index-set-debug-mips"></a>
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<p>This command turns on and off debugging messages for the <acronym>MIPS</acronym>-specific
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target code in <small>GDB</small>.
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</p>
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</dd>
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<dt><code>show debug mips</code></dt>
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<dd><a name="index-show-debug-mips"></a>
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<p>Show the current setting of <acronym>MIPS</acronym> debugging messages.
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</p></dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="HPPA.html#HPPA" accesskey="n" rel="next">HPPA</a>, Previous: <a href="Alpha.html#Alpha" accesskey="p" rel="prev">Alpha</a>, Up: <a href="Architectures.html#Architectures" accesskey="u" rel="up">Architectures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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