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{
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
tcpuprocinfo = 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,paramgr,
cpubase,
cgutils,
symconst;
constructor tcpuprocinfo.create(aparent:tprocinfo);
begin
inherited create(aparent);
got:=NR_EBX;
end;
procedure tcpuprocinfo.set_first_temp_offset;
begin
if paramanager.use_fixed_stack then
begin
if not(po_assembler in procdef.procoptions) and
(tg.direction > 0) then
tg.setfirsttemp(tg.direction*maxpushedparasize);
if (tg.direction < 0) and
not(po_nostackframe in procdef.procoptions) then
{ compensate for the return address and the "pushl %ebp" }
tg.setalignmentmismatch(sizeof(pint)*2);
end;
end;
function tcpuprocinfo.calc_stackframe_size:longint;
begin
{ align to 4 bytes at least
otherwise all those subl $2,%esp are meaningless PM }
if target_info.stackalign<=4 then
result:=Align(tg.direction*tg.lasttemp,min(current_settings.alignment.localalignmax,4))
else
{ aligned during stack frame allocation, because also depends number
of saved registers }
result:=tg.direction*tg.lasttemp+maxpushedparasize;
end;
procedure tcpuprocinfo.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 paramanager.use_fixed_stack then
para_stack_size := 0;
end;
procedure tcpuprocinfo.allocate_got_register(list: tasmlist);
begin
if (cs_create_pic in current_settings.moduleswitches) then
begin
if (pi_uses_threadvar in flags) and (tf_section_threadvars in target_info.flags) then
begin
{ FIXME: It is better to use an imaginary register for GOT and
if EBX is needed for some reason just allocate EBX and
copy GOT into it before its usage. }
cg.getcpuregister(list,NR_EBX);
got := NR_EBX;
end
else
got := cg.getaddressregister(list);
end;
end;
begin
cprocinfo:=tcpuprocinfo;
end.
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