palmos: new pascal startup code sketch. the code was tested elsewhere, but not as part of the RTL yet

git-svn-id: trunk@37216 -

.gitattributes

@@ -10017,6 +10017,7 @@ rtl/palmos/palmos.inc svneol=native#text/plain
 rtl/palmos/pilot.pp svneol=native#text/plain
 rtl/palmos/readme -text
 rtl/palmos/rtldefs.inc svneol=native#text/plain
+rtl/palmos/si_prc.pp svneol=native#text/plain
 rtl/palmos/sysdir.inc svneol=native#text/plain
 rtl/palmos/sysfile.inc svneol=native#text/plain
 rtl/palmos/sysheap.inc svneol=native#text/plain

rtl/palmos/si_prc.pp

@@ -0,0 +1,59 @@
+{
+    This file is part of the Free Pascal run time library.
+    Copyright (c) 2017 by the Free Pascal development team
+
+    System Entry point for PalmOS, Pascal only programs
+
+    See the file COPYING.FPC, included in this distribution,
+    for details about the copyright.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+ **********************************************************************}
+
+unit si_prc;
+
+interface
+
+implementation
+
+{$i palmos.inc}
+
+var
+  appInfo: SysAppInfoPtr; public name '__appInfo';
+  StkLen: LongInt; external name '__stklen';
+  sysinit_jmpbuf: jmp_buf;
+  ExitCode: LongInt;
+
+
+procedure PascalMain; external name 'PASCALMAIN';
+
+
+{ this function must be the first in this unit which contains code }
+function _FPC_proc_start: longint; cdecl; public name '_start';
+var
+  prevGlobals: Pointer;
+  globalsPtr: Pointer;
+begin
+  if SysAppStartup(appInfo, prevGlobals, globalsPtr) <> 0 then
+    begin
+      SndPlaySystemSound(sndError);
+      exit(-1);
+    end;
+
+  if setjmp(sysinit_jmpbuf) = 0 then
+    PascalMain;
+
+  SysAppExit(appInfo, prevGlobals, globalsPtr);
+  _FPC_proc_start:=ExitCode;
+end;
+
+procedure _FPC_proc_halt(_ExitCode: longint); cdecl; public name '_haltproc';
+begin
+  ExitCode:=_ExitCode;
+  longjmp(sysinit_jmpbuf,1);
+end;
+
+end.