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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
cutils,globtype,
cgbase,aasmdata,
procinfo,cpuinfo,psub;
type
trv32procinfo = class(tcgprocinfo)
{ for arm thumb, we need to know the stackframe size before
starting procedure compilation, so this contains the stack frame size, the compiler
should assume
if this size is too little the procedure must be compiled again with a larger value }
stackframesize,
floatregstart : aint;
stackpaddingreg: TSuperRegister;
needs_frame_pointer: boolean;
// procedure handle_body_start;override;
// procedure after_pass1;override;
constructor create(aparent: tprocinfo); override;
procedure set_first_temp_offset;override;
function calc_stackframe_size:longint;override;
end;
implementation
uses
globals,systems,
cpubase,
tgobj,
symconst,symtype,symsym,symcpu,paramgr,
cgutils,
cgobj,
defutil,
aasmcpu;
constructor trv32procinfo.create(aparent: tprocinfo);
begin
inherited create(aparent);
maxpushedparasize := 0;
end;
procedure trv32procinfo.set_first_temp_offset;
begin
if (po_nostackframe in procdef.procoptions) then
begin
{ maxpushedparasize sghould be zero,
if not we will get an error later. }
tg.setfirsttemp(maxpushedparasize);
exit;
end;
if tg.direction = -1 then
tg.setfirsttemp(-(1+12)*4)
else
tg.setfirsttemp(maxpushedparasize);
end;
function trv32procinfo.calc_stackframe_size:longint;
var
firstfloatreg,lastfloatreg,
r : byte;
floatsavesize : aword;
regs: tcpuregisterset;
begin
maxpushedparasize:=align(maxpushedparasize,max(current_settings.alignment.localalignmin,4));
floatsavesize:=0;
case current_settings.fputype of
fpu_fd:
begin
floatsavesize:=0;
regs:=cg.rg[R_FPUREGISTER].used_in_proc-paramanager.get_volatile_registers_fpu(pocall_stdcall);
for r:=RS_F0 to RS_F31 do
if r in regs then
inc(floatsavesize,8);
end;
else
;
end;
floatsavesize:=align(floatsavesize,max(current_settings.alignment.localalignmin,4));
result:=Align(tg.direction*tg.lasttemp,max(current_settings.alignment.localalignmin,4))+maxpushedparasize+aint(floatsavesize);
if tg.direction=1 then
floatregstart:=result-aint(floatsavesize)
else
floatregstart:=-result+maxpushedparasize;
end;
begin
cprocinfo:=trv32procinfo;
end.
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