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{
Copyright (c) 2014 by Nikolay Nikolov
i8086 version of some node tree helper routines
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
unit n8086util;
{$i fpcdefs.inc}
interface
uses
ngenutil;
type
ti8086nodeutils = class(tnodeutils)
class procedure InsertMemorySizes; override;
class procedure InsertStackSegment;
class procedure InsertHeapSegment;
class procedure InsertStackPlusHeapSize;
end;
implementation
uses
sysutils,cutils,
globtype,globals,cpuinfo,
aasmbase,aasmdata,aasmtai;
class procedure ti8086nodeutils.InsertMemorySizes;
begin
inherited;
if current_settings.x86memorymodel<>mm_tiny then
InsertStackSegment;
InsertHeapSegment;
if current_settings.x86memorymodel in x86_near_data_models then
InsertStackPlusHeapSize;
end;
class procedure ti8086nodeutils.InsertStackSegment;
var
stacksizeleft,stackblock: LongInt;
i: Integer;
begin
maybe_new_object_file(current_asmdata.asmlists[al_globals]);
new_section(current_asmdata.asmlists[al_globals],sec_stack,'__stack', 16);
current_asmdata.asmlists[al_globals].concat(tai_symbol.Createname_global('___stack', AT_DATA, stacksize));
{ HACK: since tai_datablock's size parameter is aint, which cannot be
larger than 32767 on i8086, but we'd like to support stack size of
up to 64kb, we may need to use several tai_datablocks to reserve
the stack segment }
i:=0;
stacksizeleft:=stacksize;
while stacksizeleft>0 do
begin
stackblock:=min(stacksizeleft,high(aint));
current_asmdata.asmlists[al_globals].concat(tai_datablock.Create('___stackblock'+IntToStr(i),stackblock));
dec(stacksizeleft,stackblock);
inc(i);
end;
current_asmdata.asmlists[al_globals].concat(tai_symbol.Createname_global('___stacktop',AT_DATA,0));
end;
class procedure ti8086nodeutils.InsertHeapSegment;
var
heapsizeleft,heapblock: LongInt;
i: Integer;
begin
maybe_new_object_file(current_asmdata.asmlists[al_globals]);
new_section(current_asmdata.asmlists[al_globals],sec_heap,'__heap', 16);
current_asmdata.asmlists[al_globals].concat(tai_symbol.Createname_global('___heap', AT_DATA, heapsize));
{ HACK: since tai_datablock's size parameter is aint, which cannot be
larger than 32767 on i8086, but we'd like to support heap size of
up to 640kb, we may need to use several tai_datablocks to reserve
the heap segment }
i:=0;
heapsizeleft:=heapsize;
while heapsizeleft>0 do
begin
heapblock:=min(heapsizeleft,high(aint));
current_asmdata.asmlists[al_globals].concat(tai_datablock.Create('___heapblock'+IntToStr(i),heapblock));
dec(heapsizeleft,heapblock);
inc(i);
end;
current_asmdata.asmlists[al_globals].concat(tai_symbol.Createname_global('___heaptop',AT_DATA,0));
end;
class procedure ti8086nodeutils.InsertStackPlusHeapSize;
var
maxheapsize_para: Word;
stacksize_para: Word;
begin
maxheapsize_para:=(maxheapsize+15) div 16;
stacksize_para:=(stacksize+15) div 16;
maybe_new_object_file(current_asmdata.asmlists[al_globals]);
new_section(current_asmdata.asmlists[al_globals],sec_data,'__fpc_stackplusmaxheap_in_para',sizeof(pint));
current_asmdata.asmlists[al_globals].concat(Tai_symbol.Createname_global('__fpc_stackplusmaxheap_in_para',AT_DATA,4));
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_16bit(min($1000,stacksize_para+maxheapsize_para)));
end;
begin
cnodeutils:=ti8086nodeutils;
end.
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