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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
globtype,cutils,
procinfo,cpuinfo,psub;
type
tarmprocinfo = class(tcgprocinfo)
floatregstart : aint;
// procedure handle_body_start;override;
// procedure after_pass1;override;
procedure set_first_temp_offset;override;
function calc_stackframe_size:longint;override;
end;
implementation
uses
globals,systems,
cpubase,
aasmtai,aasmdata,
tgobj,
symconst,symsym,paramgr,
cgbase,
cgobj;
procedure tarmprocinfo.set_first_temp_offset;
begin
{ We allocate enough space to save all registers because we can't determine
the necessary space because the used registers aren't known before
secondpass is run. Even worse, patching
the local offsets after generating the code could cause trouble because
"shifter" constants could change to non-"shifter" constants. This
is especially a problem when taking the address of a local. For now,
this extra memory should hurt less than generating all local contants with offsets
>256 as non shifter constants }
if tg.direction = -1 then
begin
if (target_info.system<>system_arm_darwin) then
{ Non-Darwin, worst case: r4-r10,r11,r13,r14,r15 is saved -> -28-16, but we
always adjust the frame pointer to point to the first stored
register (= last register in list above) -> + 4 }
tg.setfirsttemp(-28-16+4)
else
{ on Darwin r9 is not usable -> one less register to save }
tg.setfirsttemp(-24-16+4)
end
else
tg.setfirsttemp(maxpushedparasize);
end;
function tarmprocinfo.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_fpa,
fpu_fpa10,
fpu_fpa11:
begin
{ save floating point registers? }
firstfloatreg:=RS_NO;
regs:=cg.rg[R_FPUREGISTER].used_in_proc-paramanager.get_volatile_registers_fpu(pocall_stdcall);
for r:=RS_F0 to RS_F7 do
if r in regs then
begin
if firstfloatreg=RS_NO then
firstfloatreg:=r;
lastfloatreg:=r;
end;
if firstfloatreg<>RS_NO then
floatsavesize:=(lastfloatreg-firstfloatreg+1)*12;
end;
fpu_vfpv2,
fpu_vfpv3:
begin
floatsavesize:=0;
regs:=cg.rg[R_MMREGISTER].used_in_proc-paramanager.get_volatile_registers_mm(pocall_stdcall);
for r:=RS_D0 to RS_D31 do
if r in regs then
inc(floatsavesize,8);
end;
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);
floatregstart:=tg.direction*result+maxpushedparasize;
if tg.direction=1 then
dec(floatregstart,floatsavesize);
end;
begin
cprocinfo:=tarmprocinfo;
end.
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