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116 lines
2.6 KiB
ObjectPascal
116 lines
2.6 KiB
ObjectPascal
{
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$Id$
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This file is part of the Free Pascal run time library.
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Copyright (c) 1993,97 by Pierre Muller,
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member of the Free Pascal development team.
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Unit to Load DXE files for Go32V2
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See the file COPYING.FPC, included in this distribution,
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for details about the copyright.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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**********************************************************************
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}
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Unit dxeload;
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interface
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const
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DXE_MAGIC = $31455844;
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type
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dxe_header = record
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magic,
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symbol_offset,
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element_size,
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nrelocs : longint;
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end;
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function dxe_load(filename : string) : pointer;
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implementation
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function dxe_load(filename : string) : pointer;
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{
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Copyright (C) 1995 Charles Sandmann (sandmann@clio.rice.edu)
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translated to Free Pascal by Pierre Muller
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}
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type
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{ to avoid range check problems }
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pointer_array = array[0..maxlongint] of pointer;
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tpa = ^pointer_array;
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plongint = ^longint;
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ppointer = ^pointer;
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var
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dh : dxe_header;
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data : pchar;
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f : file;
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relocs : tpa;
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i : longint;
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addr : plongint;
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begin
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dxe_load:=nil;
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{ open the file }
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assign(f,filename);
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{$I-}
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reset(f,1);
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{$I+}
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{ quit if no file !! }
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if ioresult<>0 then
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exit;
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{ load the header }
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blockread(f,@dh,sizeof(dxe_header),i);
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if (i<>sizeof(dxe_header)) or (dh.magic<>DXE_MAGIC) then
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begin
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close(f);
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exit;
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end;
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{ get memory for code }
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getmem(data,dh.element_size);
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if data=nil then
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exit;
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{ get memory for relocations }
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getmem(relocs,dh.nrelocs*sizeof(pointer));
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if relocs=nil then
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begin
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freemem(data,dh.element_size);
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exit;
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end;
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{ copy code }
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blockread(f,data^,dh.element_size);
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blockread(f,relocs^,dh.nrelocs*sizeof(pointer));
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close(f);
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{ relocate internal references }
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for i:=0 to dh.nrelocs-1 do
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begin
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cardinal(addr):=cardinal(data)+cardinal(relocs^[i]);
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addr^:=addr^+pointer(data);
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end;
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dxe_load:=pointer( dh.symbol_offset + cardinal(data));
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end;
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end.
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{
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$Log$
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Revision 1.1 1998-12-21 13:07:02 peter
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* use -FE
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Revision 1.5 1998/10/23 16:45:41 pierre
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* check if file can be opened, returns nil if not
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Revision 1.4 1998/10/21 17:05:46 pierre
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* wmemu387.dxe was not closed !!
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Revision 1.3 1998/10/21 16:51:08 pierre
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* dxeload range check problem solved
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Revision 1.2 1998/05/31 14:18:24 peter
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* force att or direct assembling
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* cleanup of some files
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}
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