From 3f74f97cd3ab6f663cf85660dc2a1c584a32bc5e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?K=C3=A1roly=20Balogh?= <karoly@freepascal.org>
Date: Sun, 6 Jun 2004 18:32:50 +0000
Subject: [PATCH]   * initial revision

---
 rtl/morphos/notes.txt | 70 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 rtl/morphos/notes.txt

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