fpc/compiler/i386/cpupi.pas
Jonas Maebe 3266f4e483 + Compiler support for pic on darwin/i386. The i386 rtl still needs
to be made pic-safe (mainly accesses to the global default8087cw)
  * At the same time also made the non-pic code abi-compliant (access
    external data via indirect symbol pointers etc)

    Darwin/i386 also puts the got into a virtual register (like
    Darwin/ppc), a.o. because the register allocator fails to colour
    a routine in aasmcpu.pas if we take away ebx from it.

git-svn-id: trunk@8657 -
2007-09-26 21:42:27 +00:00

104 lines
3.1 KiB
ObjectPascal

{
Copyright (c) 2002 by Florian Klaempfl
This unit contains the CPU specific part of tprocinfo
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.
****************************************************************************
}
{ This unit contains the CPU specific part of tprocinfo. }
unit cpupi;
{$i fpcdefs.inc}
interface
uses
psub,procinfo,aasmdata;
type
ti386procinfo = class(tcgprocinfo)
constructor create(aparent:tprocinfo);override;
procedure set_first_temp_offset;override;
function calc_stackframe_size:longint;override;
procedure generate_parameter_info;override;
procedure allocate_got_register(list: tasmlist);override;
end;
implementation
uses
cutils,
systems,globals,globtype,
cgobj,tgobj,
cpubase,
cgutils,
symconst;
constructor ti386procinfo.create(aparent:tprocinfo);
begin
inherited create(aparent);
got:=NR_EBX;
end;
procedure ti386procinfo.set_first_temp_offset;
begin
if use_fixed_stack then
begin
if not(po_assembler in procdef.procoptions) and
(tg.direction > 0) then
tg.setfirsttemp(tg.direction*maxpushedparasize);
end;
end;
function ti386procinfo.calc_stackframe_size:longint;
begin
{ align to 4 bytes at least
otherwise all those subl $2,%esp are meaningless PM }
if (target_info.system <> system_i386_darwin) then
result:=Align(tg.direction*tg.lasttemp,min(current_settings.alignment.localalignmin,4))
else
result:=tg.direction*tg.lasttemp+maxpushedparasize;
end;
procedure ti386procinfo.generate_parameter_info;
begin
inherited generate_parameter_info;
{ Para_stack_size is only used to determine how many bytes to remove }
{ from the stack at the end of the procedure (in the "ret $xx"). }
{ If the stack is fixed, nothing has to be removed by the callee }
if use_fixed_stack then
para_stack_size := 0;
end;
procedure ti386procinfo.allocate_got_register(list: tasmlist);
begin
if (target_info.system = system_i386_darwin) and
(cs_create_pic in current_settings.moduleswitches) then
begin
got := cg.getaddressregister(list);
end;
end;
begin
cprocinfo:=ti386procinfo;
end.