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f36e5411af
fpc/compiler/arm/cpupara.pas
Jonas Maebe f36e5411af * split cpu64bit compiler define into 
a) cpu64bitaddr, which means that we are generating a compiler which
       will generate code for targets with a 64 bit address space/abi
    b) cpu64bitalu, which means that we are generating a compiler which
       will generate code for a cpu with support for 64 bit integer
       operations (possibly running in a 32 bit address space, depending
       on the cpu64bitaddr define)
   All cpus which had cpu64bit set now have both the above defines set,
   and none of the 32 bit cpus have cpu64bitalu set (and none will
   compile with it currently)
  + pint and puint types, similar to aint/aword (not pword because that
    that conflicts with pword=^word)
  * several changes from aint/aword to pint/pword
  * some changes of tcgsize2size[OS_INT] to sizeof(pint)

git-svn-id: trunk@10320 -
2008-02-13 20:44:00 +00:00

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{
Copyright (c) 2003 by Florian Klaempfl
ARM specific calling conventions
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.
****************************************************************************
}
{ ARM specific calling conventions are handled by this unit
}
unit cpupara;
{$i fpcdefs.inc}
interface
uses
globtype,globals,
aasmtai,aasmdata,
cpuinfo,cpubase,cgbase,
symconst,symbase,symtype,symdef,parabase,paramgr;
type
tarmparamanager = class(tparamanager)
function get_volatile_registers_int(calloption : tproccalloption):tcpuregisterset;override;
function get_volatile_registers_fpu(calloption : tproccalloption):tcpuregisterset;override;
function push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;override;
function ret_in_param(def : tdef;calloption : tproccalloption) : boolean;override;
procedure getintparaloc(calloption : tproccalloption; nr : longint;var cgpara:TCGPara);override;
function create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;override;
function create_varargs_paraloc_info(p : tabstractprocdef; varargspara:tvarargsparalist):longint;override;
private
procedure init_values(var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: aword);
function create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee; paras: tparalist;
var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: aword):longint;
end;
implementation
uses
verbose,systems,
rgobj,
defutil,symsym,
cgutils;
function tarmparamanager.get_volatile_registers_int(calloption : tproccalloption):tcpuregisterset;
begin
result:=VOLATILE_INTREGISTERS;
end;
function tarmparamanager.get_volatile_registers_fpu(calloption : tproccalloption):tcpuregisterset;
begin
result:=VOLATILE_FPUREGISTERS;
end;
procedure tarmparamanager.getintparaloc(calloption : tproccalloption; nr : longint;var cgpara:TCGPara);
var
paraloc : pcgparalocation;
begin
if nr<1 then
internalerror(2002070801);
cgpara.reset;
cgpara.size:=OS_ADDR;
cgpara.intsize:=sizeof(pint);
cgpara.alignment:=std_param_align;
paraloc:=cgpara.add_location;
with paraloc^ do
begin
size:=OS_INT;
{ the four first parameters are passed into registers }
if nr<=4 then
begin
loc:=LOC_REGISTER;
register:=newreg(R_INTREGISTER,RS_R0+nr-1,R_SUBWHOLE);
end
else
begin
{ the other parameters are passed on the stack }
loc:=LOC_REFERENCE;
reference.index:=NR_STACK_POINTER_REG;
reference.offset:=(nr-5)*4;
end;
end;
end;
function getparaloc(calloption : tproccalloption; p : tdef) : tcgloc;
begin
{ Later, the LOC_REFERENCE is in most cases changed into LOC_REGISTER
if push_addr_param for the def is true
}
case p.typ of
orddef:
getparaloc:=LOC_REGISTER;
floatdef:
if (calloption in [pocall_cdecl,pocall_cppdecl,pocall_softfloat]) or (cs_fp_emulation in current_settings.moduleswitches) then
getparaloc:=LOC_REGISTER
else
getparaloc:=LOC_FPUREGISTER;
enumdef:
getparaloc:=LOC_REGISTER;
pointerdef:
getparaloc:=LOC_REGISTER;
formaldef:
getparaloc:=LOC_REGISTER;
classrefdef:
getparaloc:=LOC_REGISTER;
recorddef:
getparaloc:=LOC_REGISTER;
objectdef:
getparaloc:=LOC_REGISTER;
stringdef:
if is_shortstring(p) or is_longstring(p) then
getparaloc:=LOC_REFERENCE
else
getparaloc:=LOC_REGISTER;
procvardef:
getparaloc:=LOC_REGISTER;
filedef:
getparaloc:=LOC_REGISTER;
arraydef:
getparaloc:=LOC_REFERENCE;
setdef:
if is_smallset(p) then
getparaloc:=LOC_REGISTER
else
getparaloc:=LOC_REFERENCE;
variantdef:
getparaloc:=LOC_REGISTER;
{ avoid problems with errornous definitions }
errordef:
getparaloc:=LOC_REGISTER;
else
internalerror(2002071001);
end;
end;
function tarmparamanager.push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;
begin
result:=false;
if varspez in [vs_var,vs_out] then
begin
result:=true;
exit;
end;
case def.typ of
objectdef:
result:=is_object(def) and ((varspez=vs_const) or (def.size=0));
recorddef:
result:=(varspez=vs_const) or (def.size=0);
variantdef,
formaldef:
result:=true;
arraydef:
result:=(tarraydef(def).highrange>=tarraydef(def).lowrange) or
is_open_array(def) or
is_array_of_const(def) or
is_array_constructor(def);
setdef :
result:=(tsetdef(def).settype<>smallset);
stringdef :
result:=tstringdef(def).stringtype in [st_shortstring,st_longstring];
end;
end;
function tarmparamanager.ret_in_param(def : tdef;calloption : tproccalloption) : boolean;
begin
case def.typ of
recorddef:
{ this is how gcc 4.0.4 on linux seems to do it, it doesn't look like being
ARM ABI standard compliant
}
result:=not((trecorddef(def).symtable.SymList.count=1) and
not(ret_in_param(tabstractvarsym(trecorddef(def).symtable.SymList[0]).vardef,calloption)));
{
objectdef
arraydef:
result:=not(def.size in [1,2,4]);
}
else
result:=inherited ret_in_param(def,calloption);
end;
end;
procedure tarmparamanager.init_values(var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: aword);
begin
curintreg:=RS_R0;
curfloatreg:=RS_F0;
curmmreg:=RS_D0;
cur_stack_offset:=0;
end;
function tarmparamanager.create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee; paras: tparalist;
var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: aword):longint;
var
nextintreg,nextfloatreg,nextmmreg : tsuperregister;
paradef : tdef;
paraloc : pcgparalocation;
stack_offset : aword;
hp : tparavarsym;
loc : tcgloc;
paracgsize : tcgsize;
paralen : longint;
i : integer;
procedure assignintreg;
begin
if nextintreg<=RS_R3 then
begin
paraloc^.loc:=LOC_REGISTER;
paraloc^.register:=newreg(R_INTREGISTER,nextintreg,R_SUBWHOLE);
inc(nextintreg);
end
else
begin
paraloc^.loc:=LOC_REFERENCE;
paraloc^.reference.index:=NR_STACK_POINTER_REG;
paraloc^.reference.offset:=stack_offset;
inc(stack_offset,4);
end;
end;
begin
result:=0;
nextintreg:=curintreg;
nextfloatreg:=curfloatreg;
nextmmreg:=curmmreg;
stack_offset:=cur_stack_offset;
for i:=0 to paras.count-1 do
begin
hp:=tparavarsym(paras[i]);
paradef:=hp.vardef;
hp.paraloc[side].reset;
{ currently only support C-style array of const,
there should be no location assigned to the vararg array itself }
if (p.proccalloption in [pocall_cdecl,pocall_cppdecl]) and
is_array_of_const(paradef) then
begin
paraloc:=hp.paraloc[side].add_location;
{ hack: the paraloc must be valid, but is not actually used }
paraloc^.loc:=LOC_REGISTER;
paraloc^.register:=NR_R0;
paraloc^.size:=OS_ADDR;
break;
end;
if (hp.varspez in [vs_var,vs_out]) or
push_addr_param(hp.varspez,paradef,p.proccalloption) or
is_open_array(paradef) or
is_array_of_const(paradef) then
begin
paradef:=voidpointertype;
loc:=LOC_REGISTER;
paracgsize := OS_ADDR;
paralen := tcgsize2size[OS_ADDR];
end
else
begin
if not is_special_array(paradef) then
paralen := paradef.size
else
paralen := tcgsize2size[def_cgsize(paradef)];
loc := getparaloc(p.proccalloption,paradef);
if (paradef.typ in [objectdef,arraydef,recorddef]) and
not is_special_array(paradef) and
(hp.varspez in [vs_value,vs_const]) then
paracgsize := int_cgsize(paralen)
else
begin
paracgsize:=def_cgsize(paradef);
{ for things like formaldef }
if (paracgsize=OS_NO) then
begin
paracgsize:=OS_ADDR;
paralen := tcgsize2size[OS_ADDR];
end;
end
end;
hp.paraloc[side].size:=paracgsize;
hp.paraloc[side].Alignment:=std_param_align;
hp.paraloc[side].intsize:=paralen;
{$ifdef EXTDEBUG}
if paralen=0 then
internalerror(200410311);
{$endif EXTDEBUG}
while paralen>0 do
begin
paraloc:=hp.paraloc[side].add_location;
if (loc=LOC_REGISTER) and (paracgsize in [OS_F32,OS_F64,OS_F80]) then
case paracgsize of
OS_F32:
paraloc^.size:=OS_32;
OS_F64:
paraloc^.size:=OS_32;
else
internalerror(2005082901);
end
else if (paracgsize in [OS_NO,OS_64,OS_S64]) then
paraloc^.size := OS_32
else
paraloc^.size:=paracgsize;
case loc of
LOC_REGISTER:
begin
{ align registers for eabi }
if (target_info.abi=abi_eabi) and
(paracgsize in [OS_F64,OS_64,OS_S64]) and
(nextintreg in [RS_R1,RS_R3]) then
inc(nextintreg);
{ this is not abi compliant
why? (FK) }
if nextintreg<=RS_R3 then
begin
paraloc^.loc:=LOC_REGISTER;
paraloc^.register:=newreg(R_INTREGISTER,nextintreg,R_SUBWHOLE);
inc(nextintreg);
end
else
begin
{ LOC_REFERENCE covers always the overleft }
paraloc^.loc:=LOC_REFERENCE;
paraloc^.size:=int_cgsize(paralen);
if (side=callerside) then
paraloc^.reference.index:=NR_STACK_POINTER_REG;
paraloc^.reference.offset:=stack_offset;
inc(stack_offset,align(paralen,4));
paralen:=0;
end;
end;
LOC_FPUREGISTER:
begin
if nextfloatreg<=RS_F3 then
begin
paraloc^.loc:=LOC_FPUREGISTER;
paraloc^.register:=newreg(R_FPUREGISTER,nextfloatreg,R_SUBWHOLE);
inc(nextfloatreg);
end
else
begin
paraloc^.loc:=LOC_REFERENCE;
paraloc^.reference.index:=NR_STACK_POINTER_REG;
paraloc^.reference.offset:=stack_offset;
case paraloc^.size of
OS_F32:
inc(stack_offset,4);
OS_F64:
inc(stack_offset,8);
OS_F80:
inc(stack_offset,10);
OS_F128:
inc(stack_offset,16);
else
internalerror(200403201);
end;
end;
end;
LOC_REFERENCE:
begin
{ align stack for eabi }
if (target_info.abi=abi_eabi) and
(paracgsize in [OS_F64,OS_64,OS_S64]) and
(stack_offset mod 8<>0) then
inc(stack_offset,8-(stack_offset mod 8));
paraloc^.size:=OS_ADDR;
if push_addr_param(hp.varspez,paradef,p.proccalloption) or
is_open_array(paradef) or
is_array_of_const(paradef) then
assignintreg
else
begin
paraloc^.loc:=LOC_REFERENCE;
paraloc^.reference.index:=NR_STACK_POINTER_REG;
paraloc^.reference.offset:=stack_offset;
inc(stack_offset,hp.vardef.size);
end;
end;
else
internalerror(2002071002);
end;
if side=calleeside then
begin
if paraloc^.loc=LOC_REFERENCE then
begin
paraloc^.reference.index:=NR_FRAME_POINTER_REG;
inc(paraloc^.reference.offset,4);
end;
end;
dec(paralen,tcgsize2size[paraloc^.size]);
end;
end;
curintreg:=nextintreg;
curfloatreg:=nextfloatreg;
curmmreg:=nextmmreg;
cur_stack_offset:=stack_offset;
result:=cur_stack_offset;
end;
function tarmparamanager.create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;
var
cur_stack_offset: aword;
curintreg, curfloatreg, curmmreg: tsuperregister;
retcgsize : tcgsize;
begin
init_values(curintreg,curfloatreg,curmmreg,cur_stack_offset);
result:=create_paraloc_info_intern(p,side,p.paras,curintreg,curfloatreg,curmmreg,cur_stack_offset);
{ Constructors return self instead of a boolean }
if (p.proctypeoption=potype_constructor) then
retcgsize:=OS_ADDR
else
retcgsize:=def_cgsize(p.returndef);
location_reset(p.funcretloc[side],LOC_INVALID,OS_NO);
p.funcretloc[side].size:=retcgsize;
{ void has no location }
if is_void(p.returndef) then
begin
location_reset(p.funcretloc[side],LOC_VOID,OS_NO);
exit;
end;
{ Return is passed as var parameter }
if ret_in_param(p.returndef,p.proccalloption) then
begin
p.funcretloc[side].loc:=LOC_REFERENCE;
p.funcretloc[side].size:=retcgsize;
exit;
end;
{ Return in FPU register? }
if p.returndef.typ=floatdef then
begin
if (p.proccalloption in [pocall_softfloat]) or (cs_fp_emulation in current_settings.moduleswitches) then
begin
case retcgsize of
OS_64,
OS_F64:
begin
{ low }
p.funcretloc[side].loc:=LOC_REGISTER;
p.funcretloc[side].register64.reglo:=NR_FUNCTION_RESULT64_LOW_REG;
p.funcretloc[side].register64.reghi:=NR_FUNCTION_RESULT64_HIGH_REG;
p.funcretloc[side].size:=OS_64;
end;
OS_32,
OS_F32:
begin
p.funcretloc[side].loc:=LOC_REGISTER;
p.funcretloc[side].register:=NR_FUNCTION_RETURN_REG;
p.funcretloc[side].size:=OS_32;
end;
else
internalerror(2005082603);
end;
end
else
begin
p.funcretloc[side].loc:=LOC_FPUREGISTER;
p.funcretloc[side].register:=NR_FPU_RESULT_REG;
end;
end
{ Return in register }
else
begin
if retcgsize in [OS_64,OS_S64] then
begin
{ low }
p.funcretloc[side].loc:=LOC_REGISTER;
p.funcretloc[side].register64.reglo:=NR_FUNCTION_RESULT64_LOW_REG;
p.funcretloc[side].register64.reghi:=NR_FUNCTION_RESULT64_HIGH_REG;
end
else
begin
p.funcretloc[side].loc:=LOC_REGISTER;
p.funcretloc[side].register:=NR_FUNCTION_RETURN_REG;
end;
end;
end;
function tarmparamanager.create_varargs_paraloc_info(p : tabstractprocdef; varargspara:tvarargsparalist):longint;
var
cur_stack_offset: aword;
curintreg, curfloatreg, curmmreg: tsuperregister;
begin
init_values(curintreg,curfloatreg,curmmreg,cur_stack_offset);
result:=create_paraloc_info_intern(p,callerside,p.paras,curintreg,curfloatreg,curmmreg,cur_stack_offset);
if (p.proccalloption in [pocall_cdecl,pocall_cppdecl]) then
{ just continue loading the parameters in the registers }
result:=create_paraloc_info_intern(p,callerside,varargspara,curintreg,curfloatreg,curmmreg,cur_stack_offset)
else
internalerror(200410231);
end;
begin
paramanager:=tarmparamanager.create;
end.
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