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61 lines
1.8 KiB
HTML
61 lines
1.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<META NAME="GENERATOR" CONTENT="LinuxDoc-Tools 0.9.20">
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<TITLE>ld65 Users Guide: Special segments</TITLE>
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<LINK HREF="ld65-7.html" REL=next>
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<LINK HREF="ld65-5.html" REL=previous>
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<LINK HREF="ld65.html#toc6" REL=contents>
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</HEAD>
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<BODY>
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<A HREF="ld65-7.html">Next</A>
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<A HREF="ld65-5.html">Previous</A>
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<A HREF="ld65.html#toc6">Contents</A>
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<H2><A NAME="s6">6.</A> <A HREF="ld65.html#toc6">Special segments</A></H2>
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<P>The builtin config files do contain segments that have a special meaning for
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the compiler and the libraries that come with it. If you replace the builtin
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config files, you will need the following information.</P>
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<H2><A NAME="ss6.1">6.1</A> <A HREF="ld65.html#toc6.1">INIT</A>
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</H2>
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<P>The INIT segment is used for initialization code that may be reused once
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executation reaches main() - provided that the program runs in RAM. You
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may for example add the INIT segment to the heap in really memory
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constrained systems.</P>
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<H2><A NAME="ss6.2">6.2</A> <A HREF="ld65.html#toc6.2">LOWCODE</A>
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</H2>
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<P>For the LOWCODE segment, it is guaranteed that it won't be banked out, so it
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is reachable at any time by interrupt handlers or similar.</P>
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<H2><A NAME="ss6.3">6.3</A> <A HREF="ld65.html#toc6.3">STARTUP</A>
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</H2>
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<P>This segment contains the startup code which initializes the C software stack
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and the libraries. It is placed in its own segment because it needs to be
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loaded at the lowest possible program address on several platforms.</P>
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<H2><A NAME="ss6.4">6.4</A> <A HREF="ld65.html#toc6.4">HEAP</A>
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</H2>
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<P>This segment defines the location of the memory heap used by the malloc
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routine. </P>
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<A HREF="ld65-7.html">Next</A>
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<A HREF="ld65.html#toc6">Contents</A>
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