{
    This file is part of the Free Pascal run time library.
    Copyright (c) 2005 Karoly Balogh

    abox.lib implementation for MorphOS/PowerPC

    MorphOS port was done on a free Pegasos II/G4 machine
    provided by Genesi S.a.r.l. <www.genesi.lu>

    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 amigalib;

interface

function DoMethod(obj : longword; msg : array of LongWord): longword;
function DoMethod(obj : pointer; msg : array of LongWord): longword; inline;
function DoMethodA(obj : longword; msg1 : Pointer): longword; assembler;

function DoSuperMethod(class_: longword; obj : longword; msg : array of LongWord): longword;
function DoSuperMethodA(class_: longword; obj : longword; msg1 : Pointer): longword; assembler;
function DoSuperMethodA(class_: pointer; obj : pointer; msg1 : Pointer): longword; inline;

function DoSuperNew(class_: pointer; obj: pointer; tags: array of LongWord): longword;

// This procedure is used to pop dispatcher args from emulstruc
procedure DISPATCHERARG(var cl; var obj; var msg); assembler;

function HookEntry: longword;

implementation

uses exec, intuition, utility;

function DoMethodA(obj : longword; msg1 : Pointer): longword; assembler;
asm
  mflr r31

  lwz r9,-4(r3)
  stw r9,32(r2)
  stw r4,36(r2)
  stw r3,40(r2)

  lwz r11,104(r2)
  lwz r3,8(r9)
  mtlr r11
  blrl

  mtlr r31
end ['R31'];

function DoMethod(obj : longword; msg : array of LongWord): longword;
begin
  DoMethod:=DoMethodA(obj, @msg);
end;

function DoMethod(obj : pointer; msg : array of LongWord): longword; inline;
begin
  DoMethod:=DoMethodA(DWord(obj), @msg);
end;

function DoSuperMethodA(class_: longword; obj : longword; msg1 : Pointer): longword; assembler;
asm
  mflr r31

  lwz r9,24(r3)
  stw r9,32(r2)
  stw r5,36(r2)
  stw r4,40(r2)

  lwz r11,104(r2)
  lwz r3,8(r9)
  mtlr r11
  blrl

  mtlr r31
end ['R31'];

function DoSuperMethodA(class_: pointer; obj : pointer; msg1 : Pointer): longword; inline;
begin
  DoSuperMethodA:=DoSuperMethodA(DWord(class_),DWord(obj),msg1);
end;

function DoSuperMethod(class_: longword; obj : longword; msg : array of LongWord): longword;
begin
  DoSuperMethod:=DoSuperMethodA(class_, obj, @msg);
end;

function DoSuperNew(class_: pointer; obj: pointer; tags: array of LongWord): longword;
var opSet: topSet;
begin
  opSet.MethodID := OM_NEW;
  opSet.ops_AttrList := @tags;
  opSet.ops_GInfo := nil;
  DoSuperNew:=DoSuperMethodA(class_,obj,@opset);
end;

// This procedure is used to pop dispatcher args from emulstruc
procedure DISPATCHERARG(var cl; var obj; var msg); assembler;
asm
  lwz r6,32(r2) // REG_a0
  stw r6,(r3)   // cl
  lwz r6,40(r2) // REG_a2
  stw r6,(r4)   // obj
  lwz r6,36(r2) // REG_a1
  stw r6,(r5)   // msg
end;

type
  THookSubEntryFunc = function(a, b, c: Pointer): longword;

function HookEntry: longword;
var
  hook: PHook;
begin
  hook:=REG_A0;
  HookEntry:=THookSubEntryFunc(hook^.h_SubEntry)(hook, REG_A2, REG_A1);
end;

end.