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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
tppcprocinfo = class(tcgprocinfo)
needstackframe: boolean;
{ offset where the frame pointer from the outer procedure is stored. }
parent_framepointer_offset : longint;
constructor create(aparent:tprocinfo);override;
procedure set_first_temp_offset;override;
function calc_stackframe_size:longint;override;
function uses_stack_temps: boolean;
procedure allocate_got_register(list: TAsmList);override;
private
first_save_int_reg, first_save_fpu_reg: tsuperregister;
public
needs_frame_pointer: boolean;
property get_first_save_int_reg: tsuperregister read first_save_int_reg;
property get_first_save_fpu_reg: tsuperregister read first_save_fpu_reg;
end;
implementation
uses
globals,systems,
cpubase,
aasmtai,
tgobj,cgobj,
symconst,symsym,paramgr,symutil,symtable,
verbose;
constructor tppcprocinfo.create(aparent:tprocinfo);
begin
inherited create(aparent);
first_save_int_reg:=32;
first_save_fpu_reg:=32;
needs_frame_pointer:=false;
end;
procedure tppcprocinfo.set_first_temp_offset;
var
ofs : aword;
begin
if not(po_assembler in procdef.procoptions) then
begin
case target_info.abi of
abi_powerpc_aix:
ofs:=maxpushedparasize+LinkageAreaSizeAIX;
abi_powerpc_sysv:
ofs:=maxpushedparasize+LinkageAreaSizeSYSV;
else
internalerror(200402191);
end;
tg.setfirsttemp(ofs);
end
else
begin
if (current_procinfo.procdef.localst.symtabletype=localsymtable) and
(tabstractlocalsymtable(current_procinfo.procdef.localst).count_locals <> 0) then
begin
{ at 0(r1), the previous value of r1 will be stored }
tg.setfirsttemp(4);
end
end;
end;
(*
procedure tppcprocinfo.after_pass1;
begin
if not(po_assembler in procdef.procoptions) then
begin
if cs_asm_source in current_settings.globalswitches then
aktproccode.insert(Tai_comment.Create(strpnew('Parameter copies start at: r1+'+tostr(procdef.parast.address_fixup))));
if cs_asm_source in current_settings.globalswitches then
aktproccode.insert(Tai_comment.Create(strpnew('Locals start at: r1+'+tostr(procdef.localst.address_fixup))));
firsttemp_offset:=align(procdef.localst.address_fixup+procdef.localst.datasize,16);
if cs_asm_source in current_settings.globalswitches then
aktproccode.insert(Tai_comment.Create(strpnew('Temp. space start: r1+'+tostr(firsttemp_offset))));
//!!!! tg.setfirsttemp(firsttemp_offset);
tg.firsttemp:=firsttemp_offset;
tg.lasttemp:=firsttemp_offset;
inherited after_pass1;
end;
end;
*)
function tppcprocinfo.uses_stack_temps: boolean;
begin
result := tg.firsttemp <> tg.lasttemp;
end;
function tppcprocinfo.calc_stackframe_size:longint;
var
low_nonvol_fpu_reg, regcounter: tsuperregister;
begin
if not (po_assembler in procdef.procoptions) then
begin
first_save_fpu_reg := 32;
first_save_int_reg := 32;
{ FIXME: has to be R_F14 instead of R_F8 for SYSV-64bit }
case target_info.abi of
abi_powerpc_aix:
low_nonvol_fpu_reg := RS_F14;
abi_powerpc_sysv:
low_nonvol_fpu_reg := RS_F14;
else
internalerror(2003122903);
end;
for regcounter := low_nonvol_fpu_reg to RS_F31 do
begin
if regcounter in cg.rg[R_FPUREGISTER].used_in_proc then
begin
first_save_fpu_reg := ord(regcounter) - ord(RS_F0);
break;
end;
end;
for regcounter := RS_R13 to RS_R31 do
begin
if regcounter in cg.rg[R_INTREGISTER].used_in_proc then
begin
first_save_int_reg := ord(regcounter) - ord(RS_R0);
break;
end;
end;
if not(pi_do_call in flags) and
(not uses_stack_temps) and
(((target_info.abi = abi_powerpc_aix) and
((32-first_save_int_reg)*4+(32-first_save_fpu_reg)*8 <= 220)) or
((target_info.abi = abi_powerpc_sysv) and
(first_save_int_reg + first_save_fpu_reg = 64))) then
begin
{ don't allocate a stack frame }
result := (32-first_save_int_reg)*4+(32-first_save_fpu_reg)*8;
needstackframe := false;
end
else
begin
result := (32-first_save_int_reg)*4+(32-first_save_fpu_reg)*8+tg.lasttemp;
result := align(result,16);
needstackframe := result<>0;
end;
end
else
begin
result := align(tg.lasttemp,16);
needstackframe := result<>0;
end;
end;
procedure tppcprocinfo.allocate_got_register(list: TAsmList);
begin
if (target_info.system = system_powerpc_darwin) and
(cs_create_pic in current_settings.moduleswitches) then
begin
got := cg.getaddressregister(list);
end;
end;
begin
cprocinfo:=tppcprocinfo;
end.
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