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71 lines
2.3 KiB
Plaintext
71 lines
2.3 KiB
Plaintext
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{ $Id$ }
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Notes about MorphOS version of Free Pascal:
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Stack:
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========================================================================
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Under MorphOS, the default stack is set to 256 kB. Stack size can be set
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directly by the programmer with the compiler switch (-Cs), or with the
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{$MEMORY} directive. The memory area for the stack is dynamically
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allocated on program startup, so if you set this value too high, in low
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memory situations your program may exit immediately on startup without
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any further notice.
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Syscalls:
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========================================================================
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Free Pascal currently supports ABox-style calls for MorphOS. Using
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additional hand-written assembly is not needed to call any ABox library
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function. However, you must declare every function you're going to use
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by the following way:
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Var
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my_LibBase: Pointer;
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function my_LibCall(param1: longint location 'd0',
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param2: longint location 'd1'): LongInt;
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SysCall my_LibBase 1234;
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Where my_LibBase is the library base returned by exec's OpenLibrary()
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call, and 1234 is the call offset. Please note that offset values in
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Free Pascal must be specified as positive values, and not negative as
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shown in MorphOS SDK.
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The value after location can be any 68k registers from d0-d7/a0-a6. Note
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that a7 and sp cannot be used. Register names are not case sensitive.
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In SysCalls you must specify location for every arguments explicity.
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MOST IMPORTANT: You must open libraries explicitly _BEFORE_ using any
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functions from it, because the compiler will not do it for you. Don't
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forget to close libraries before you exit.
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Before declaring a SysCall function, please check the units provided
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with FPC, the function you want to use might already be declared in one
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of the units, and ready to use.
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Alignment:
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========================================================================
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Record elements are aligned to DWORD (4 bytes) under MorphOS. Use
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{$PACKRECORDS 2} if you need word aligned structures. For byte
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aligned records, use packed record.
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Thanks:
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========================================================================
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MorphOS port of Free Pascal Compiler was possible, because Genesi
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S.a.r.l. <www.genesi.lu> provided a free Pegasos II/G4 machine to do
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the developments on it.
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{
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$Log$
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Revision 1.1 2004-06-06 18:32:50 karoly
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* initial revision
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}
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