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{
This file is part of the Free Pascal run time library.
Copyright (c) 2016 by the Free Pascal development team
System Entry point for Amiga/68k, 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
var
AOS_ExecBase: Pointer; public name '_ExecBase';
AOS_DosBase: Pointer; external name '_DOSBase';
realExecBase: Pointer absolute $4;
StkLen: LongInt; external name '__stklen';
sysinit_jmpbuf: jmp_buf;
ExitCode: LongInt;
{ the definitions in there need AOS_Execbase }
{$include execd.inc}
{$include execf.inc}
{$include timerd.inc}
{$include doslibd.inc}
{$include doslibf.inc}
{$if defined(AMIGA_V1_0_ONLY) or defined(AMIGA_V1_2_ONLY)}
{$define AMIGA_LEGACY}
{$include legacyexech.inc}
{$endif}
{$ifdef AMIGA_LEGACY}
var
args: pointer; public name '__fpc_args';
arglen: dword; public name '__fpc_arglen';
{$endif}
var
sst: TStackSwapStruct;
const
{$if defined(AMIGA_V1_0_ONLY)}
NEEDS_NEWER_OS = 'This program needs newer OS.'+LineEnding;
{$else}
{$if defined(AMIGA_V1_2_ONLY)}
NEEDS_NEWER_OS = 'This program needs OS 1.2 or newer.'+LineEnding;
{$else}
{$if defined(AMIGA_V2_0_ONLY)}
NEEDS_NEWER_OS = 'This program needs OS 2.04 or newer.'+LineEnding;
{$else}
NEEDS_NEWER_OS = 'This program needs OS 3.0 or newer.'+LineEnding;
{$endif}
{$endif}
{$endif}
procedure PascalMain; external name 'PASCALMAIN';
{ this function must be the first in this unit which contains code }
function _FPC_proc_start: longint; cdecl; public name '_start';
var
newStack: Pointer;
task: PTask;
begin
{$IFDEF AMIGA_LEGACY}
asm
move.l d0, arglen
move.l a0, args
end;
{$ENDIF}
AOS_ExecBase:=realExecBase;
if PLibrary(AOS_ExecBase)^.lib_Version < AMIGA_OS_MINVERSION then
begin
AOS_DOSBase:=OpenLibrary('dos.library',0);
if AOS_DOSBase <> nil then
begin
dosWrite(dosOutput,PChar(NEEDS_NEWER_OS),length(NEEDS_NEWER_OS));
CloseLibrary(AOS_DOSBase);
end;
exit(20);
end;
newStack:=nil;
task:=FindTask(nil);
if (task^.tc_SPUpper-task^.tc_SPLower < StkLen) then
begin
newStack:=AllocVec(StkLen,MEMF_ANY);
sst.stk_Lower:=newStack;
sst.stk_Upper:=newStack+StkLen;
sst.stk_Pointer:=newStack+StkLen;
StackSwap(@sst);
end;
{ Note: code between the two stackswaps only works because of the
nature of the generated code. We're accessing globals which is
safe, and the locals are either kept in reg, or accessed via
the base pointer (A5), and because we don't use the stack for
call arguments, only regs. If this CG behavior changes, this
code might break. In that case an asm-written StackSwap+call
wrapper code is the solution. (Basically the reimplementation
of AROS' NewStackSwap or MorphOS' NewPPCStackSwap.) (KB) }
if setjmp(sysinit_jmpbuf) = 0 then
PascalMain;
if newStack <> nil then
begin
StackSwap(@sst);
FreeVec(newStack);
end;
_FPC_proc_start:=ExitCode;
end;
procedure _FPC_proc_halt(_ExitCode: longint); cdecl; public name '_haltproc';
begin
ExitCode:=_ExitCode;
longjmp(sysinit_jmpbuf,1);
end;
end.
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