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|
{
Copyright (c) 2002 by Florian Klaempfl
PowerPC 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.
****************************************************************************
}
unit cpupara;
{$i fpcdefs.inc}
interface
uses
globtype,
aasmtai,aasmdata,
cpubase,
symconst,symtype,symdef,symsym,
paramgr,parabase,cgbase,cgutils;
type
tppcparamanager = 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;
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;
function get_funcretloc(p : tabstractprocdef; side: tcallercallee; def: tdef): tcgpara;override;
procedure create_funcretloc_info(p : tabstractprocdef; side: tcallercallee);
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; varargsparas: boolean):longint;
function parseparaloc(p : tparavarsym;const s : string) : boolean;override;
end;
implementation
uses
verbose,systems,
defutil,symtable,
procinfo,cpupi;
function tppcparamanager.get_volatile_registers_int(calloption : tproccalloption):tcpuregisterset;
begin
if (target_info.system = system_powerpc_darwin) then
result := [RS_R0,RS_R2..RS_R12]
else
result := [RS_R0,RS_R3..RS_R12];
end;
function tppcparamanager.get_volatile_registers_fpu(calloption : tproccalloption):tcpuregisterset;
begin
case target_info.abi of
abi_powerpc_aix,
abi_powerpc_sysv:
result := [RS_F0..RS_F13];
else
internalerror(2003091401);
end;
end;
procedure tppcparamanager.getintparaloc(calloption : tproccalloption; nr : longint;var cgpara:TCGPara);
var
paraloc : pcgparalocation;
begin
cgpara.reset;
cgpara.size:=OS_ADDR;
cgpara.intsize:=sizeof(pint);
cgpara.alignment:=get_para_align(calloption);
paraloc:=cgpara.add_location;
with paraloc^ do
begin
size:=OS_INT;
if (nr<=8) then
begin
if nr=0 then
internalerror(200309271);
loc:=LOC_REGISTER;
register:=newreg(R_INTREGISTER,RS_R2+nr,R_SUBWHOLE);
end
else
begin
loc:=LOC_REFERENCE;
paraloc^.reference.index:=NR_STACK_POINTER_REG;
if (target_info.abi <> abi_powerpc_aix) then
reference.offset:=sizeof(pint)*(nr-8)
else
reference.offset:=sizeof(pint)*(nr);
end;
end;
end;
function getparaloc(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:
result:=LOC_REGISTER;
floatdef:
result:=LOC_FPUREGISTER;
enumdef:
result:=LOC_REGISTER;
pointerdef:
result:=LOC_REGISTER;
formaldef:
result:=LOC_REGISTER;
classrefdef:
result:=LOC_REGISTER;
procvardef:
if (target_info.abi = abi_powerpc_aix) or
(p.size = sizeof(pint)) then
result:=LOC_REGISTER
else
result:=LOC_REFERENCE;
recorddef:
if (target_info.abi<>abi_powerpc_aix) or
((p.size >= 3) and
((p.size mod 4) <> 0)) then
result:=LOC_REFERENCE
else
result:=LOC_REGISTER;
objectdef:
if is_object(p) then
result:=LOC_REFERENCE
else
result:=LOC_REGISTER;
stringdef:
if is_shortstring(p) or is_longstring(p) then
result:=LOC_REFERENCE
else
result:=LOC_REGISTER;
filedef:
result:=LOC_REGISTER;
arraydef:
result:=LOC_REFERENCE;
setdef:
if is_smallset(p) then
result:=LOC_REGISTER
else
result:=LOC_REFERENCE;
variantdef:
result:=LOC_REFERENCE;
{ avoid problems with errornous definitions }
errordef:
result:=LOC_REGISTER;
else
internalerror(2002071001);
end;
end;
function tppcparamanager.push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;
begin
result:=false;
{ var,out,constref always require address }
if varspez in [vs_var,vs_out,vs_constref] then
begin
result:=true;
exit;
end;
case def.typ of
variantdef,
formaldef :
result:=true;
{ regular procvars must be passed by value, because you cannot pass
the address of a local stack location when calling e.g.
pthread_create with the address of a function (first of all it
expects the address of the function to execute and not the address
of a memory location containing that address, and secondly if you
first store the address on the stack and then pass the address of
this stack location, then this stack location may no longer be
valid when the newly started thread accesses it.
However, for "procedure of object" we must use the same calling
convention as for "8 byte record" due to the need for
interchangeability with the TMethod record type.
}
procvardef :
result:=
(target_info.abi <> abi_powerpc_aix) and
(def.size <> sizeof(pint));
recorddef :
result :=
(target_info.abi<>abi_powerpc_aix) or
((varspez = vs_const) and
((calloption = pocall_mwpascal) or
(not (calloption in [pocall_cdecl,pocall_cppdecl]) and
(def.size > 8)
)
)
);
arraydef:
result:=(tarraydef(def).highrange>=tarraydef(def).lowrange) or
is_open_array(def) or
is_array_of_const(def) or
is_array_constructor(def);
objectdef :
result:=is_object(def);
setdef :
result:=not is_smallset(def);
stringdef :
result:=tstringdef(def).stringtype in [st_shortstring,st_longstring];
end;
end;
procedure tppcparamanager.init_values(var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: aword);
begin
case target_info.abi of
abi_powerpc_aix:
cur_stack_offset:=24;
abi_powerpc_sysv:
cur_stack_offset:=8;
else
internalerror(2003051901);
end;
curintreg:=RS_R3;
curfloatreg:=RS_F1;
curmmreg:=RS_M1;
end;
procedure tppcparamanager.create_funcretloc_info(p : tabstractprocdef; side: tcallercallee);
begin
p.funcretloc[side]:=get_funcretloc(p,side,p.returndef);
end;
function tppcparamanager.get_funcretloc(p : tabstractprocdef; side: tcallercallee; def: tdef): tcgpara;
var
paraloc : pcgparalocation;
retcgsize : tcgsize;
begin
result.init;
result.alignment:=get_para_align(p.proccalloption);
{ void has no location }
if is_void(def) then
begin
paraloc:=result.add_location;
result.size:=OS_NO;
result.intsize:=0;
paraloc^.size:=OS_NO;
paraloc^.loc:=LOC_VOID;
exit;
end;
{ Constructors return self instead of a boolean }
if (p.proctypeoption=potype_constructor) then
begin
retcgsize:=OS_ADDR;
result.intsize:=sizeof(pint);
end
else
begin
retcgsize:=def_cgsize(def);
result.intsize:=def.size;
end;
result.size:=retcgsize;
{ Return is passed as var parameter }
if ret_in_param(def,p.proccalloption) then
begin
paraloc:=result.add_location;
paraloc^.loc:=LOC_REFERENCE;
paraloc^.size:=retcgsize;
exit;
end;
paraloc:=result.add_location;
{ Return in FPU register? }
if def.typ=floatdef then
begin
paraloc^.loc:=LOC_FPUREGISTER;
paraloc^.register:=NR_FPU_RESULT_REG;
paraloc^.size:=retcgsize;
end
else
{ Return in register }
begin
if retcgsize in [OS_64,OS_S64] then
begin
{ low 32bits }
paraloc^.loc:=LOC_REGISTER;
if side=callerside then
paraloc^.register:=NR_FUNCTION_RESULT64_HIGH_REG
else
paraloc^.register:=NR_FUNCTION_RETURN64_HIGH_REG;
paraloc^.size:=OS_32;
{ high 32bits }
paraloc:=result.add_location;
paraloc^.loc:=LOC_REGISTER;
if side=callerside then
paraloc^.register:=NR_FUNCTION_RESULT64_LOW_REG
else
paraloc^.register:=NR_FUNCTION_RETURN64_LOW_REG;
paraloc^.size:=OS_32;
end
else
begin
paraloc^.loc:=LOC_REGISTER;
if side=callerside then
paraloc^.register:=newreg(R_INTREGISTER,RS_FUNCTION_RESULT_REG,cgsize2subreg(R_INTREGISTER,retcgsize))
else
paraloc^.register:=newreg(R_INTREGISTER,RS_FUNCTION_RETURN_REG,cgsize2subreg(R_INTREGISTER,retcgsize));
paraloc^.size:=retcgsize;
end;
end;
end;
function tppcparamanager.create_paraloc_info(p : tabstractprocdef; side: tcallercallee):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,side,p.paras,curintreg,curfloatreg,curmmreg,cur_stack_offset,false);
create_funcretloc_info(p,side);
end;
function tppcparamanager.create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee; paras:tparalist;
var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: aword; varargsparas: boolean):longint;
var
stack_offset: longint;
paralen: aint;
nextintreg,nextfloatreg,nextmmreg, maxfpureg : tsuperregister;
paradef : tdef;
paraloc : pcgparalocation;
i : integer;
hp : tparavarsym;
loc : tcgloc;
paracgsize: tcgsize;
sym: tfieldvarsym;
begin
{$ifdef extdebug}
if po_explicitparaloc in p.procoptions then
internalerror(200411141);
{$endif extdebug}
result:=0;
nextintreg := curintreg;
nextfloatreg := curfloatreg;
nextmmreg := curmmreg;
stack_offset := cur_stack_offset;
case target_info.abi of
abi_powerpc_aix:
maxfpureg := RS_F13;
abi_powerpc_sysv:
maxfpureg := RS_F8;
else internalerror(2004070912);
end;
for i:=0 to paras.count-1 do
begin
hp:=tparavarsym(paras[i]);
paradef := hp.vardef;
{ Syscall for Morphos can have already a paraloc set }
if (vo_has_explicit_paraloc in hp.varoptions) then
begin
if not(vo_is_syscall_lib in hp.varoptions) then
internalerror(200412153);
continue;
end;
hp.paraloc[side].reset;
{ currently only support C-style array of const }
if (p.proccalloption in [pocall_cdecl,pocall_cppdecl,pocall_mwpascal]) 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)];
if (target_info.abi = abi_powerpc_aix) and
(paradef.typ = recorddef) and
(hp.varspez in [vs_value,vs_const]) then
begin
{ if a record has only one field and that field is }
{ non-composite (not array or record), it must be }
{ passed according to the rules of that type. }
if tabstractrecordsymtable(tabstractrecorddef(paradef).symtable).has_single_field(sym) and
((sym.vardef.typ=floatdef) or
((target_info.system=system_powerpc_darwin) and
(sym.vardef.typ in [orddef,enumdef]))) then
begin
paradef:=sym.vardef;
paracgsize:=def_cgsize(paradef);
end
else
begin
paracgsize := int_cgsize(paralen);
end;
end
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;
loc := getparaloc(paradef);
if varargsparas and
(target_info.abi = abi_powerpc_aix) and
(paradef.typ = floatdef) then
begin
loc := LOC_REGISTER;
if paracgsize = OS_F64 then
paracgsize := OS_64
else
paracgsize := OS_32;
end;
hp.paraloc[side].alignment:=std_param_align;
hp.paraloc[side].size:=paracgsize;
hp.paraloc[side].intsize:=paralen;
if (target_info.abi = abi_powerpc_aix) and
(paradef.typ in [recorddef,arraydef]) then
hp.paraloc[side].composite:=true;
{$ifndef cpu64bitaddr}
if (target_info.abi=abi_powerpc_sysv) and
is_64bit(paradef) and
odd(nextintreg-RS_R3) then
inc(nextintreg);
{$endif not cpu64bitaddr}
if (paralen = 0) then
if (paradef.typ = recorddef) then
begin
paraloc:=hp.paraloc[side].add_location;
paraloc^.loc := LOC_VOID;
end
else
internalerror(2005011310);
{ can become < 0 for e.g. 3-byte records }
while (paralen > 0) do
begin
paraloc:=hp.paraloc[side].add_location;
{ In case of po_delphi_nested_cc, the parent frame pointer
is always passed on the stack. }
if (loc = LOC_REGISTER) and
(nextintreg <= RS_R10) and
(not(vo_is_parentfp in hp.varoptions) or
not(po_delphi_nested_cc in p.procoptions)) then
begin
paraloc^.loc := loc;
{ make sure we don't lose whether or not the type is signed }
if (paradef.typ <> orddef) then
paracgsize := int_cgsize(paralen);
if (paracgsize in [OS_NO,OS_64,OS_S64,OS_128,OS_S128]) then
paraloc^.size := OS_INT
else
paraloc^.size := paracgsize;
paraloc^.register:=newreg(R_INTREGISTER,nextintreg,R_SUBNONE);
inc(nextintreg);
dec(paralen,tcgsize2size[paraloc^.size]);
if target_info.abi=abi_powerpc_aix then
inc(stack_offset,align(tcgsize2size[paraloc^.size],4));
end
else if (loc = LOC_FPUREGISTER) and
(nextfloatreg <= maxfpureg) then
begin
paraloc^.loc:=loc;
paraloc^.size := paracgsize;
paraloc^.register:=newreg(R_FPUREGISTER,nextfloatreg,R_SUBWHOLE);
inc(nextfloatreg);
dec(paralen,tcgsize2size[paraloc^.size]);
{ if nextfpureg > maxfpureg, all intregs are already used, since there }
{ are less of those available for parameter passing in the AIX abi }
if target_info.abi=abi_powerpc_aix then
{$ifndef cpu64bitaddr}
if (paracgsize = OS_F32) then
begin
inc(stack_offset,4);
if (nextintreg < RS_R11) then
inc(nextintreg);
end
else
begin
inc(stack_offset,8);
if (nextintreg < RS_R10) then
inc(nextintreg,2)
else
nextintreg := RS_R11;
end;
{$else not cpu64bitaddr}
begin
inc(stack_offset,tcgsize2size[paracgsize]);
if (nextintreg < RS_R11) then
inc(nextintreg);
end;
{$endif not cpu64bitaddr}
end
else { LOC_REFERENCE }
begin
paraloc^.loc:=LOC_REFERENCE;
case loc of
LOC_FPUREGISTER:
paraloc^.size:=int_float_cgsize(paralen);
LOC_REGISTER,
LOC_REFERENCE:
paraloc^.size:=int_cgsize(paralen);
else
internalerror(2006011101);
end;
if (side = callerside) then
paraloc^.reference.index:=NR_STACK_POINTER_REG
else
begin
paraloc^.reference.index:=NR_R12;
tppcprocinfo(current_procinfo).needs_frame_pointer := true;
end;
if (target_info.abi = abi_powerpc_aix) and
(hp.paraloc[side].intsize < 3) then
paraloc^.reference.offset:=stack_offset+(4-paralen)
else
paraloc^.reference.offset:=stack_offset;
inc(stack_offset,align(paralen,4));
while (paralen > 0) and
(nextintreg < RS_R11) do
begin
inc(nextintreg);
dec(paralen,sizeof(pint));
end;
paralen := 0;
end;
end;
end;
curintreg:=nextintreg;
curfloatreg:=nextfloatreg;
curmmreg:=nextmmreg;
cur_stack_offset:=stack_offset;
result:=stack_offset;
end;
function tppcparamanager.create_varargs_paraloc_info(p : tabstractprocdef; varargspara:tvarargsparalist):longint;
var
cur_stack_offset: aword;
parasize, l: longint;
curintreg, firstfloatreg, curfloatreg, curmmreg: tsuperregister;
i : integer;
hp: tparavarsym;
paraloc: pcgparalocation;
begin
init_values(curintreg,curfloatreg,curmmreg,cur_stack_offset);
firstfloatreg:=curfloatreg;
result:=create_paraloc_info_intern(p,callerside,p.paras,curintreg,curfloatreg,curmmreg,cur_stack_offset, false);
if (p.proccalloption in [pocall_cdecl,pocall_cppdecl,pocall_mwpascal]) then
{ just continue loading the parameters in the registers }
begin
result:=create_paraloc_info_intern(p,callerside,varargspara,curintreg,curfloatreg,curmmreg,cur_stack_offset,true);
{ varargs routines have to reserve at least 32 bytes for the AIX abi }
if (target_info.abi = abi_powerpc_aix) and
(result < 32) then
result := 32;
end
else
begin
parasize:=cur_stack_offset;
for i:=0 to varargspara.count-1 do
begin
hp:=tparavarsym(varargspara[i]);
hp.paraloc[callerside].alignment:=4;
paraloc:=hp.paraloc[callerside].add_location;
paraloc^.loc:=LOC_REFERENCE;
paraloc^.size:=def_cgsize(hp.vardef);
paraloc^.reference.index:=NR_STACK_POINTER_REG;
l:=push_size(hp.varspez,hp.vardef,p.proccalloption);
paraloc^.reference.offset:=parasize;
parasize:=parasize+l;
end;
result:=parasize;
end;
if curfloatreg<>firstfloatreg then
include(varargspara.varargsinfo,va_uses_float_reg);
end;
function tppcparamanager.parseparaloc(p : tparavarsym;const s : string) : boolean;
var
paraloc : pcgparalocation;
paracgsize : tcgsize;
begin
result:=false;
case target_info.system of
system_powerpc_morphos:
begin
paracgsize:=def_cgsize(p.vardef);
p.paraloc[callerside].alignment:=4;
p.paraloc[callerside].size:=paracgsize;
p.paraloc[callerside].intsize:=tcgsize2size[paracgsize];
paraloc:=p.paraloc[callerside].add_location;
paraloc^.loc:=LOC_REFERENCE;
paraloc^.size:=paracgsize;
paraloc^.reference.index:=newreg(R_INTREGISTER,RS_R2,R_SUBWHOLE);
{ pattern is always uppercase'd }
if s='D0' then
paraloc^.reference.offset:=0
else if s='D1' then
paraloc^.reference.offset:=4
else if s='D2' then
paraloc^.reference.offset:=8
else if s='D3' then
paraloc^.reference.offset:=12
else if s='D4' then
paraloc^.reference.offset:=16
else if s='D5' then
paraloc^.reference.offset:=20
else if s='D6' then
paraloc^.reference.offset:=24
else if s='D7' then
paraloc^.reference.offset:=28
else if s='A0' then
paraloc^.reference.offset:=32
else if s='A1' then
paraloc^.reference.offset:=36
else if s='A2' then
paraloc^.reference.offset:=40
else if s='A3' then
paraloc^.reference.offset:=44
else if s='A4' then
paraloc^.reference.offset:=48
else if s='A5' then
paraloc^.reference.offset:=52
{ 'A6' (offset 56) is used by mossyscall as libbase, so API
never passes parameters in it,
Indeed, but this allows to declare libbase either explicitly
or let the compiler insert it }
else if s='A6' then
paraloc^.reference.offset:=56
{ 'A7' is the stack pointer on 68k, can't be overwritten
by API calls, so it has no offset }
{ 'R12' is special, used internally to support r12base sysv
calling convention }
else if s='R12' then
begin
paraloc^.loc:=LOC_REGISTER;
paraloc^.size:=OS_ADDR;
paraloc^.register:=NR_R12;
end
else
exit;
{ copy to callee side }
p.paraloc[calleeside].add_location^:=paraloc^;
end;
else
internalerror(200404182);
end;
result:=true;
end;
begin
paramanager:=tppcparamanager.create;
end.
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