Import stripped Arm GNU Toolchain 13.2.Rel1HEAD umineko

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author: alk3pInjection <webmaster@raspii.tech> 2024-02-04 16:16:35 +0800
committer: alk3pInjection <webmaster@raspii.tech> 2024-02-04 16:16:35 +0800
commit: abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch)
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+<title>Using the GNU Compiler Collection (GCC): MIPS Function Attributes</title>
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+<a name="MIPS-Function-Attributes"></a>
+<div class="header">
+<p>
+Next: <a href="MSP430-Function-Attributes.html#MSP430-Function-Attributes" accesskey="n" rel="next">MSP430 Function Attributes</a>, Previous: <a href="Microsoft-Windows-Function-Attributes.html#Microsoft-Windows-Function-Attributes" accesskey="p" rel="previous">Microsoft Windows Function Attributes</a>, Up: <a href="Function-Attributes.html#Function-Attributes" accesskey="u" rel="up">Function Attributes</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p>
+</div>
+<hr>
+<a name="MIPS-Function-Attributes-1"></a>
+<h4 class="subsection">6.33.19 MIPS Function Attributes</h4>
+
+<p>These function attributes are supported by the MIPS back end:
+</p>
+<dl compact="compact">
+<dd><a name="index-interrupt-function-attribute_002c-MIPS"></a>
+</dd>
+<dt><code>interrupt</code></dt>
+<dd><p>Use this attribute to indicate that the specified function is an interrupt
+handler.  The compiler generates function entry and exit sequences suitable
+for use in an interrupt handler when this attribute is present.
+An optional argument is supported for the interrupt attribute which allows
+the interrupt mode to be described.  By default GCC assumes the external
+interrupt controller (EIC) mode is in use, this can be explicitly set using
+<code>eic</code>.  When interrupts are non-masked then the requested Interrupt
+Priority Level (IPL) is copied to the current IPL which has the effect of only
+enabling higher priority interrupts.  To use vectored interrupt mode use
+the argument <code>vector=[sw0|sw1|hw0|hw1|hw2|hw3|hw4|hw5]</code>, this will change
+the behavior of the non-masked interrupt support and GCC will arrange to mask
+all interrupts from sw0 up to and including the specified interrupt vector.
+</p>
+<p>You can use the following attributes to modify the behavior
+of an interrupt handler:
+</p><dl compact="compact">
+<dd><a name="index-use_005fshadow_005fregister_005fset-function-attribute_002c-MIPS"></a>
+</dd>
+<dt><code>use_shadow_register_set</code></dt>
+<dd><p>Assume that the handler uses a shadow register set, instead of
+the main general-purpose registers.  An optional argument <code>intstack</code> is
+supported to indicate that the shadow register set contains a valid stack
+pointer.
+</p>
+<a name="index-keep_005finterrupts_005fmasked-function-attribute_002c-MIPS"></a>
+</dd>
+<dt><code>keep_interrupts_masked</code></dt>
+<dd><p>Keep interrupts masked for the whole function.  Without this attribute,
+GCC tries to reenable interrupts for as much of the function as it can.
+</p>
+<a name="index-use_005fdebug_005fexception_005freturn-function-attribute_002c-MIPS"></a>
+</dd>
+<dt><code>use_debug_exception_return</code></dt>
+<dd><p>Return using the <code>deret</code> instruction.  Interrupt handlers that don&rsquo;t
+have this attribute return using <code>eret</code> instead.
+</p></dd>
+</dl>
+
+<p>You can use any combination of these attributes, as shown below:
+</p><div class="smallexample">
+<pre class="smallexample">void __attribute__ ((interrupt)) v0 ();
+void __attribute__ ((interrupt, use_shadow_register_set)) v1 ();
+void __attribute__ ((interrupt, keep_interrupts_masked)) v2 ();
+void __attribute__ ((interrupt, use_debug_exception_return)) v3 ();
+void __attribute__ ((interrupt, use_shadow_register_set,
+                     keep_interrupts_masked)) v4 ();
+void __attribute__ ((interrupt, use_shadow_register_set,
+                     use_debug_exception_return)) v5 ();
+void __attribute__ ((interrupt, keep_interrupts_masked,
+                     use_debug_exception_return)) v6 ();
+void __attribute__ ((interrupt, use_shadow_register_set,
+                     keep_interrupts_masked,
+                     use_debug_exception_return)) v7 ();
+void __attribute__ ((interrupt(&quot;eic&quot;))) v8 ();
+void __attribute__ ((interrupt(&quot;vector=hw3&quot;))) v9 ();
+</pre></div>
+
+<a name="index-indirect-calls_002c-MIPS"></a>
+<a name="index-long_005fcall-function-attribute_002c-MIPS"></a>
+<a name="index-short_005fcall-function-attribute_002c-MIPS"></a>
+<a name="index-near-function-attribute_002c-MIPS"></a>
+<a name="index-far-function-attribute_002c-MIPS"></a>
+</dd>
+<dt><code>long_call</code></dt>
+<dt><code>short_call</code></dt>
+<dt><code>near</code></dt>
+<dt><code>far</code></dt>
+<dd><p>These attributes specify how a particular function is called on MIPS.
+The attributes override the <samp>-mlong-calls</samp> (see <a href="MIPS-Options.html#MIPS-Options">MIPS Options</a>)
+command-line switch.  The <code>long_call</code> and <code>far</code> attributes are
+synonyms, and cause the compiler to always call
+the function by first loading its address into a register, and then using
+the contents of that register.  The <code>short_call</code> and <code>near</code>
+attributes are synonyms, and have the opposite
+effect; they specify that non-PIC calls should be made using the more
+efficient <code>jal</code> instruction.
+</p>
+<a name="index-mips16-function-attribute_002c-MIPS"></a>
+<a name="index-nomips16-function-attribute_002c-MIPS"></a>
+</dd>
+<dt><code>mips16</code></dt>
+<dt><code>nomips16</code></dt>
+<dd>
+<p>On MIPS targets, you can use the <code>mips16</code> and <code>nomips16</code>
+function attributes to locally select or turn off MIPS16 code generation.
+A function with the <code>mips16</code> attribute is emitted as MIPS16 code,
+while MIPS16 code generation is disabled for functions with the
+<code>nomips16</code> attribute.  These attributes override the
+<samp>-mips16</samp> and <samp>-mno-mips16</samp> options on the command line
+(see <a href="MIPS-Options.html#MIPS-Options">MIPS Options</a>).
+</p>
+<p>When compiling files containing mixed MIPS16 and non-MIPS16 code, the
+preprocessor symbol <code>__mips16</code> reflects the setting on the command line,
+not that within individual functions.  Mixed MIPS16 and non-MIPS16 code
+may interact badly with some GCC extensions such as <code>__builtin_apply</code>
+(see <a href="Constructing-Calls.html#Constructing-Calls">Constructing Calls</a>).
+</p>
+<a name="index-micromips-function-attribute"></a>
+<a name="index-nomicromips-function-attribute"></a>
+</dd>
+<dt><code>micromips, MIPS</code></dt>
+<dt><code>nomicromips, MIPS</code></dt>
+<dd>
+<p>On MIPS targets, you can use the <code>micromips</code> and <code>nomicromips</code>
+function attributes to locally select or turn off microMIPS code generation.
+A function with the <code>micromips</code> attribute is emitted as microMIPS code,
+while microMIPS code generation is disabled for functions with the
+<code>nomicromips</code> attribute.  These attributes override the
+<samp>-mmicromips</samp> and <samp>-mno-micromips</samp> options on the command line
+(see <a href="MIPS-Options.html#MIPS-Options">MIPS Options</a>).
+</p>
+<p>When compiling files containing mixed microMIPS and non-microMIPS code, the
+preprocessor symbol <code>__mips_micromips</code> reflects the setting on the
+command line,
+not that within individual functions.  Mixed microMIPS and non-microMIPS code
+may interact badly with some GCC extensions such as <code>__builtin_apply</code>
+(see <a href="Constructing-Calls.html#Constructing-Calls">Constructing Calls</a>).
+</p>
+<a name="index-nocompression-function-attribute_002c-MIPS"></a>
+</dd>
+<dt><code>nocompression</code></dt>
+<dd><p>On MIPS targets, you can use the <code>nocompression</code> function attribute
+to locally turn off MIPS16 and microMIPS code generation.  This attribute
+overrides the <samp>-mips16</samp> and <samp>-mmicromips</samp> options on the
+command line (see <a href="MIPS-Options.html#MIPS-Options">MIPS Options</a>).
+</p>
+<a name="index-use_005fhazard_005fbarrier_005freturn-function-attribute_002c-MIPS"></a>
+</dd>
+<dt><code>use_hazard_barrier_return</code></dt>
+<dd><p>This function attribute instructs the compiler to generate a hazard barrier
+return that clears all execution and instruction hazards while returning,
+instead of generating a normal return instruction.
+</p></dd>
+</dl>
+
+<hr>
+<div class="header">
+<p>
+Next: <a href="MSP430-Function-Attributes.html#MSP430-Function-Attributes" accesskey="n" rel="next">MSP430 Function Attributes</a>, Previous: <a href="Microsoft-Windows-Function-Attributes.html#Microsoft-Windows-Function-Attributes" accesskey="p" rel="previous">Microsoft Windows Function Attributes</a>, Up: <a href="Function-Attributes.html#Function-Attributes" accesskey="u" rel="up">Function Attributes</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p>
+</div>
+
+
+
+</body>
+</html>
author	alk3pInjection <webmaster@raspii.tech>	2024-02-04 16:16:35 +0800
committer	alk3pInjection <webmaster@raspii.tech>	2024-02-04 16:16:35 +0800
commit	abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch)
tree	00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/gcc/MIPS-Function-Attributes.html