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<a name="MIPS"></a>
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Next: <a rel="next" accesskey="n" href="HPPA.html#HPPA">HPPA</a>,
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Previous: <a rel="previous" accesskey="p" href="Alpha.html#Alpha">Alpha</a>,
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Up: <a rel="up" accesskey="u" href="Architectures.html#Architectures">Architectures</a>
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<h4 class="subsection">21.4.4 <acronym>MIPS</acronym></h4>
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<p><a name="index-stack-on-Alpha-1613"></a><a name="index-stack-on-_0040acronym_007bMIPS_007d-1614"></a><a name="index-Alpha-stack-1615"></a><a name="index-g_t_0040acronym_007bMIPS_007d-stack-1616"></a>Alpha- and <acronym>MIPS</acronym>-based computers use an unusual stack frame, which
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sometimes requires <span class="sc">gdb</span> to search backward in the object code to
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find the beginning of a function.
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<p><a name="index-response-time_002c-_0040acronym_007bMIPS_007d-debugging-1617"></a>To improve response time (especially for embedded applications, where
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<span class="sc">gdb</span> 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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<a name="index-g_t_0040code_007bheuristic_002dfence_002dpost_007d-_0028Alpha_002c-_0040acronym_007bMIPS_007d_0029-1618"></a>
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<dl><dt><code>set heuristic-fence-post </code><var>limit</var><dd>Restrict <span class="sc">gdb</span> 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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<br><dt><code>show heuristic-fence-post</code><dd>Display the current limit.
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</dl>
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<p class="noindent">These commands are available <em>only</em> when <span class="sc">gdb</span> is configured
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for debugging programs on Alpha or <acronym>MIPS</acronym> processors.
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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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<dl>
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<dt><code>set mips abi </code><var>arg</var><dd><a name="index-set-mips-abi-1619"></a><a name="index-set-ABI-for-_0040acronym_007bMIPS_007d-1620"></a>Tell <span class="sc">gdb</span> 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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<dl>
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<dt>‘<samp><span class="samp">auto</span></samp>’<dd>The default ABI associated with the current binary (this is the
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default).
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<br><dt>‘<samp><span class="samp">o32</span></samp>’<br><dt>‘<samp><span class="samp">o64</span></samp>’<br><dt>‘<samp><span class="samp">n32</span></samp>’<br><dt>‘<samp><span class="samp">n64</span></samp>’<br><dt>‘<samp><span class="samp">eabi32</span></samp>’<br><dt>‘<samp><span class="samp">eabi64</span></samp>’<dd></dl>
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<br><dt><code>show mips abi</code><dd><a name="index-show-mips-abi-1621"></a>Show the <acronym>MIPS</acronym> ABI used by <span class="sc">gdb</span> to debug the inferior.
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<br><dt><code>set mips compression </code><var>arg</var><dd><a name="index-set-mips-compression-1622"></a><a name="index-code-compression_002c-_0040acronym_007bMIPS_007d-1623"></a>Tell <span class="sc">gdb</span> 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. <span class="sc">gdb</span> 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>Possible values of <var>arg</var> are ‘<samp><span class="samp">mips16</span></samp>’ and ‘<samp><span class="samp">micromips</span></samp>’.
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The default compressed <acronym title="Instruction Set Architecture">ISA</acronym> encoding is ‘<samp><span class="samp">mips16</span></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>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>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, <span class="sc">gdb</span> 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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<br><dt><code>show mips compression</code><dd><a name="index-show-mips-compression-1624"></a>Show the <acronym>MIPS</acronym> compressed <acronym title="Instruction Set Architecture">ISA</acronym> encoding used by
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<span class="sc">gdb</span> to debug the inferior.
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<br><dt><code>set mipsfpu</code><dt><code>show mipsfpu</code><dd>See <a href="MIPS-Embedded.html#MIPS-Embedded">set mipsfpu</a>.
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<br><dt><code>set mips mask-address </code><var>arg</var><dd><a name="index-set-mips-mask_002daddress-1625"></a><a name="index-g_t_0040acronym_007bMIPS_007d-addresses_002c-masking-1626"></a>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><span class="samp">on</span></samp>’, ‘<samp><span class="samp">off</span></samp>’, or ‘<samp><span class="samp">auto</span></samp>’. The latter is the default
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setting, which lets <span class="sc">gdb</span> determine the correct value.
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<br><dt><code>show mips mask-address</code><dd><a name="index-show-mips-mask_002daddress-1627"></a>Show whether the upper 32 bits of <acronym>MIPS</acronym> addresses are masked off or
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not.
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<br><dt><code>set remote-mips64-transfers-32bit-regs</code><dd><a name="index-set-remote_002dmips64_002dtransfers_002d32bit_002dregs-1628"></a>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 <span class="sc">sr</span> and <span class="sc">fsr</span>,
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and 64 bits for other registers, set this option to ‘<samp><span class="samp">on</span></samp>’.
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<br><dt><code>show remote-mips64-transfers-32bit-regs</code><dd><a name="index-show-remote_002dmips64_002dtransfers_002d32bit_002dregs-1629"></a>Show the current setting of compatibility with older <acronym>MIPS</acronym> 64 targets.
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<br><dt><code>set debug mips</code><dd><a name="index-set-debug-mips-1630"></a>This command turns on and off debugging messages for the <acronym>MIPS</acronym>-specific
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target code in <span class="sc">gdb</span>.
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<br><dt><code>show debug mips</code><dd><a name="index-show-debug-mips-1631"></a>Show the current setting of <acronym>MIPS</acronym> debugging messages.
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</dl>
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