81 lines
4.8 KiB
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81 lines
4.8 KiB
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<html lang="en">
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<title>M68HC11-Directives - Using as</title>
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="M68HC11_002dDependent.html#M68HC11_002dDependent" title="M68HC11-Dependent">
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<link rel="prev" href="M68HC11_002dModifiers.html#M68HC11_002dModifiers" title="M68HC11-Modifiers">
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<link rel="next" href="M68HC11_002dFloat.html#M68HC11_002dFloat" title="M68HC11-Float">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled ``GNU Free Documentation License''.
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</head>
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<body>
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<div class="node">
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<a name="M68HC11-Directives"></a>
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<a name="M68HC11_002dDirectives"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="M68HC11_002dFloat.html#M68HC11_002dFloat">M68HC11-Float</a>,
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Previous: <a rel="previous" accesskey="p" href="M68HC11_002dModifiers.html#M68HC11_002dModifiers">M68HC11-Modifiers</a>,
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Up: <a rel="up" accesskey="u" href="M68HC11_002dDependent.html#M68HC11_002dDependent">M68HC11-Dependent</a>
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<hr>
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</div>
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<h4 class="subsection">9.23.4 Assembler Directives</h4>
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<p><a name="index-assembler-directives_002c-M68HC11-1489"></a><a name="index-assembler-directives_002c-M68HC12-1490"></a><a name="index-M68HC11-assembler-directives-1491"></a><a name="index-M68HC12-assembler-directives-1492"></a>
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The 68HC11 and 68HC12 version of <code>as</code> have the following
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specific assembler directives:
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<dl>
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<dt><code>.relax</code><dd><a name="index-assembler-directive-_002erelax_002c-M68HC11-1493"></a><a name="index-M68HC11-assembler-directive-_002erelax-1494"></a>The relax directive is used by the ‘<samp><span class="samp">GNU Compiler</span></samp>’ to emit a specific
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relocation to mark a group of instructions for linker relaxation.
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The sequence of instructions within the group must be known to the linker
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so that relaxation can be performed.
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<br><dt><code>.mode [mshort|mlong|mshort-double|mlong-double]</code><dd><a name="index-assembler-directive-_002emode_002c-M68HC11-1495"></a><a name="index-M68HC11-assembler-directive-_002emode-1496"></a>This directive specifies the ABI. It overrides the ‘<samp><span class="samp">-mshort</span></samp>’,
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‘<samp><span class="samp">-mlong</span></samp>’, ‘<samp><span class="samp">-mshort-double</span></samp>’ and ‘<samp><span class="samp">-mlong-double</span></samp>’ options.
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<br><dt><code>.far </code><var>symbol</var><dd><a name="index-assembler-directive-_002efar_002c-M68HC11-1497"></a><a name="index-M68HC11-assembler-directive-_002efar-1498"></a>This directive marks the symbol as a ‘<samp><span class="samp">far</span></samp>’ symbol meaning that it
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uses a ‘<samp><span class="samp">call/rtc</span></samp>’ calling convention as opposed to ‘<samp><span class="samp">jsr/rts</span></samp>’.
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During a final link, the linker will identify references to the ‘<samp><span class="samp">far</span></samp>’
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symbol and will verify the proper calling convention.
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<br><dt><code>.interrupt </code><var>symbol</var><dd><a name="index-assembler-directive-_002einterrupt_002c-M68HC11-1499"></a><a name="index-M68HC11-assembler-directive-_002einterrupt-1500"></a>This directive marks the symbol as an interrupt entry point.
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This information is then used by the debugger to correctly unwind the
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frame across interrupts.
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<br><dt><code>.xrefb </code><var>symbol</var><dd><a name="index-assembler-directive-_002exrefb_002c-M68HC11-1501"></a><a name="index-M68HC11-assembler-directive-_002exrefb-1502"></a>This directive is defined for compatibility with the
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‘<samp><span class="samp">Specification for Motorola 8 and 16-Bit Assembly Language Input
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Standard</span></samp>’ and is ignored.
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</dl>
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</body></html>
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