71 lines
3.1 KiB
HTML
71 lines
3.1 KiB
HTML
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<html lang="en">
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<title>Assembly Routines - SBCL Internals</title>
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<link rel="up" href="Calling-Convention.html#Calling-Convention" title="Calling Convention">
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<link rel="next" href="Local-Calls.html#Local-Calls" title="Local Calls">
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This manual is part of the SBCL software system. See the `README'
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file for more information.
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This manual is in the public domain and is provided with
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<div class="node">
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<p>
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<a name="Assembly-Routines"></a>
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Next: <a rel="next" accesskey="n" href="Local-Calls.html#Local-Calls">Local Calls</a>,
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Up: <a rel="up" accesskey="u" href="Calling-Convention.html#Calling-Convention">Calling Convention</a>
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</div>
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<h3 class="section">2.1 Assembly Routines</h3>
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<pre class="example"> ;;; The :full-call assembly-routines must use the same full-call
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;;; unknown-values return convention as a normal call, as some
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;;; of the routines will tail-chain to a static-function. The
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;;; routines themselves, however, take all of their arguments
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;;; in registers (this will typically be one or two arguments,
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;;; and is one of the lower bounds on the number of argument-
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;;; passing registers), and thus don't need a call frame, which
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;;; simplifies things for the normal call/return case. When it
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;;; is neccessary for one of the assembly-functions to call a
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;;; static-function it will construct the required call frame.
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;;; Also, none of the assembly-routines return other than one
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;;; value, which again simplifies the return path.
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;;; -- AB, 2006/Feb/05.
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</pre>
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<p>There are a couple of assembly-routines that implement parts of
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the process of returning or tail-calling with a variable number
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of values. These are <code>return-multiple</code> and <code>tail-call-variable</code> in
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<samp><span class="file">src/assembly/x86/assem-rtns.lisp</span></samp>. They have their own calling
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convention for invocation from a VOP, but implement various
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block-move operations on the stack contents followed by a return
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or tail-call operation.
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<p>That's about all I have to say about the assembly-routines.
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</body></html>
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