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https://gitlab.com/freepascal.org/fpc/source.git
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510 lines
18 KiB
ObjectPascal
510 lines
18 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 2003 by Florian Klaempfl
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ARM specific calling conventions
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************
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}
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{ ARM specific calling conventions are handled by this unit
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}
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unit cpupara;
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{$i fpcdefs.inc}
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interface
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uses
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globtype,
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aasmtai,
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cpuinfo,cpubase,cgbase,
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symconst,symbase,symtype,symdef,parabase,paramgr;
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type
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tarmparamanager = class(tparamanager)
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function get_volatile_registers_int(calloption : tproccalloption):tcpuregisterset;override;
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function get_volatile_registers_fpu(calloption : tproccalloption):tcpuregisterset;override;
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function push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;override;
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procedure getintparaloc(calloption : tproccalloption; nr : longint;var cgpara:TCGPara);override;
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function create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;override;
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function create_varargs_paraloc_info(p : tabstractprocdef; varargspara:tvarargspara):longint;override;
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private
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procedure init_values(var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: aword);
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function create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee; firstpara: tparaitem;
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var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: aword):longint;
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end;
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implementation
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uses
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verbose,systems,
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rgobj,
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defutil,symsym;
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function tarmparamanager.get_volatile_registers_int(calloption : tproccalloption):tcpuregisterset;
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begin
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result:=VOLATILE_INTREGISTERS;
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end;
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function tarmparamanager.get_volatile_registers_fpu(calloption : tproccalloption):tcpuregisterset;
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begin
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result:=VOLATILE_FPUREGISTERS;
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end;
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procedure tarmparamanager.getintparaloc(calloption : tproccalloption; nr : longint;var cgpara:TCGPara);
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var
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paraloc : pcgparalocation;
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begin
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if nr<1 then
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internalerror(2002070801);
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cgpara.reset;
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cgpara.size:=OS_INT;
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cgpara.alignment:=std_param_align;
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paraloc:=cgpara.add_location;
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with paraloc^ do
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begin
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size:=OS_INT;
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{ the four first parameters are passed into registers }
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if nr<=4 then
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begin
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loc:=LOC_REGISTER;
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register:=newreg(R_INTREGISTER,RS_R0+nr-1,R_SUBWHOLE);
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end
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else
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begin
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{ the other parameters are passed on the stack }
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loc:=LOC_REFERENCE;
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reference.index:=NR_STACK_POINTER_REG;
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reference.offset:=(nr-5)*4;
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end;
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end;
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end;
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function getparaloc(calloption : tproccalloption; p : tdef) : tcgloc;
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begin
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{ Later, the LOC_REFERENCE is in most cases changed into LOC_REGISTER
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if push_addr_param for the def is true
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}
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case p.deftype of
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orddef:
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getparaloc:=LOC_REGISTER;
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floatdef:
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if calloption=pocall_softfloat then
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getparaloc:=LOC_REGISTER
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else
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getparaloc:=LOC_FPUREGISTER;
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enumdef:
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getparaloc:=LOC_REGISTER;
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pointerdef:
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getparaloc:=LOC_REGISTER;
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formaldef:
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getparaloc:=LOC_REGISTER;
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classrefdef:
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getparaloc:=LOC_REGISTER;
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recorddef:
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getparaloc:=LOC_REFERENCE;
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objectdef:
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if is_object(p) then
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getparaloc:=LOC_REFERENCE
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else
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getparaloc:=LOC_REGISTER;
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stringdef:
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if is_shortstring(p) or is_longstring(p) then
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getparaloc:=LOC_REFERENCE
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else
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getparaloc:=LOC_REGISTER;
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procvardef:
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if (po_methodpointer in tprocvardef(p).procoptions) then
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getparaloc:=LOC_REFERENCE
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else
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getparaloc:=LOC_REGISTER;
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filedef:
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getparaloc:=LOC_REGISTER;
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arraydef:
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getparaloc:=LOC_REFERENCE;
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setdef:
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if is_smallset(p) then
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getparaloc:=LOC_REGISTER
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else
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getparaloc:=LOC_REFERENCE;
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variantdef:
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getparaloc:=LOC_REFERENCE;
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{ avoid problems with errornous definitions }
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errordef:
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getparaloc:=LOC_REGISTER;
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else
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internalerror(2002071001);
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end;
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end;
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function tarmparamanager.push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;
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begin
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if varspez in [vs_var,vs_out] then
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begin
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result:=true;
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exit;
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end;
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case def.deftype of
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recorddef:
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result:=true;
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arraydef:
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result:=(tarraydef(def).highrange>=tarraydef(def).lowrange) or
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is_open_array(def) or
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is_array_of_const(def) or
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is_array_constructor(def);
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setdef :
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result:=(tsetdef(def).settype<>smallset);
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stringdef :
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result:=tstringdef(def).string_typ in [st_shortstring,st_longstring];
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procvardef :
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result:=po_methodpointer in tprocvardef(def).procoptions;
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else
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result:=inherited push_addr_param(varspez,def,calloption);
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end;
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end;
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procedure tarmparamanager.init_values(var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: aword);
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begin
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curintreg:=RS_R0;
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curfloatreg:=RS_F0;
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curmmreg:=RS_D0;
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cur_stack_offset:=0;
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end;
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function tarmparamanager.create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee; firstpara: tparaitem;
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var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: aword):longint;
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var
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nextintreg,nextfloatreg,nextmmreg : tsuperregister;
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paradef : tdef;
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paraloc : pcgparalocation;
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stack_offset : aword;
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hp : tparaitem;
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loc : tcgloc;
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paracgsize : tcgsize;
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paralen : longint;
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procedure assignintreg;
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begin
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if nextintreg<=ord(NR_R3) then
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begin
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paraloc^.loc:=LOC_REGISTER;
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paraloc^.register:=newreg(R_INTREGISTER,nextintreg,R_SUBWHOLE);
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inc(nextintreg);
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end
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else
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begin
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paraloc^.loc:=LOC_REFERENCE;
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paraloc^.reference.index:=NR_STACK_POINTER_REG;
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paraloc^.reference.offset:=stack_offset;
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inc(stack_offset,4);
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end;
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end;
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begin
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result:=0;
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nextintreg:=curintreg;
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nextfloatreg:=curfloatreg;
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nextmmreg:=curmmreg;
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stack_offset:=cur_stack_offset;
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hp:=firstpara;
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while assigned(hp) do
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begin
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{ currently only support C-style array of const,
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there should be no location assigned to the vararg array itself }
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if (p.proccalloption in [pocall_cdecl,pocall_cppdecl]) and
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is_array_of_const(hp.paratype.def) then
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begin
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paraloc:=hp.paraloc[side].add_location;
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{ hack: the paraloc must be valid, but is not actually used }
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paraloc^.loc:=LOC_REGISTER;
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paraloc^.register:=NR_R0;
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paraloc^.size:=OS_ADDR;
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break;
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end;
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if push_addr_param(hp.paratyp,hp.paratype.def,p.proccalloption) then
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paracgsize:=OS_ADDR
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else
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begin
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paracgsize:=def_cgSize(hp.paratype.def);
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if paracgsize=OS_NO then
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paracgsize:=OS_ADDR;
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end;
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hp.paraloc[side].reset;
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hp.paraloc[side].size:=paracgsize;
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hp.paraloc[side].Alignment:=std_param_align;
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if (hp.paratyp in [vs_var,vs_out]) then
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begin
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paradef:=voidpointertype.def;
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loc:=LOC_REGISTER;
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end
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else
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begin
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paradef:=hp.paratype.def;
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loc:=getparaloc(p.proccalloption,paradef);
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end;
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paralen:=tcgsize2size[paracgsize];
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{$ifdef EXTDEBUG}
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if paralen=0 then
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internalerror(200410311);
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{$endif EXTDEBUG}
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while paralen>0 do
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begin
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paraloc:=hp.paraloc[side].add_location;
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{ for things like formaldef }
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if paracgsize=OS_NO then
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paraloc^.size:=OS_ADDR
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else if paracgsize in [OS_64,OS_S64] then
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paraloc^.size:=OS_32
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else
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paraloc^.size:=paracgsize;
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case loc of
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LOC_REGISTER:
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begin
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{ this is not abi compliant }
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if nextintreg<=RS_R3 then
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begin
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paraloc^.loc:=LOC_REGISTER;
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paraloc^.register:=newreg(R_INTREGISTER,nextintreg,R_SUBWHOLE);
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inc(nextintreg);
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end
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else
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begin
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paraloc^.loc:=LOC_REFERENCE;
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paraloc^.reference.index:=NR_STACK_POINTER_REG;
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paraloc^.reference.offset:=stack_offset;
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inc(stack_offset,4);
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end;
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end;
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LOC_FPUREGISTER:
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begin
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if nextfloatreg<=RS_F3 then
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begin
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paraloc^.loc:=LOC_FPUREGISTER;
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paraloc^.register:=newreg(R_FPUREGISTER,nextfloatreg,R_SUBWHOLE);
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inc(nextfloatreg);
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end
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else
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begin
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paraloc^.loc:=LOC_REFERENCE;
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paraloc^.reference.index:=NR_STACK_POINTER_REG;
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paraloc^.reference.offset:=stack_offset;
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case paraloc^.size of
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OS_F32:
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inc(stack_offset,4);
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OS_F64:
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inc(stack_offset,8);
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OS_F80:
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inc(stack_offset,10);
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OS_F128:
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inc(stack_offset,16);
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else
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internalerror(200403201);
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end;
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end;
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end;
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LOC_REFERENCE:
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begin
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paraloc^.size:=OS_ADDR;
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if push_addr_param(hp.paratyp,paradef,p.proccalloption) or
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is_open_array(paradef) or
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is_array_of_const(paradef) then
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assignintreg
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else
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begin
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paraloc^.loc:=LOC_REFERENCE;
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paraloc^.reference.index:=NR_STACK_POINTER_REG;
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paraloc^.reference.offset:=stack_offset;
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inc(stack_offset,hp.paratype.def.size);
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end;
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end;
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else
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internalerror(2002071002);
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end;
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if side=calleeside then
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begin
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if paraloc^.loc=LOC_REFERENCE then
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begin
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paraloc^.reference.index:=NR_FRAME_POINTER_REG;
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inc(paraloc^.reference.offset,4);
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end;
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end;
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dec(paralen,tcgsize2size[paraloc^.size]);
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end;
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hp:=tparaitem(hp.next);
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end;
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curintreg:=nextintreg;
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curfloatreg:=nextfloatreg;
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curmmreg:=nextmmreg;
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cur_stack_offset:=stack_offset;
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result:=cur_stack_offset;
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end;
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function tarmparamanager.create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;
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var
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paraloc : pcgparalocation;
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cur_stack_offset: aword;
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curintreg, curfloatreg, curmmreg: tsuperregister;
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retcgsize : tcgsize;
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begin
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init_values(curintreg,curfloatreg,curmmreg,cur_stack_offset);
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result:=create_paraloc_info_intern(p,side,tparaitem(p.para.first),curintreg,curfloatreg,curmmreg,cur_stack_offset);
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{ Constructors return self instead of a boolean }
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if (p.proctypeoption=potype_constructor) then
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retcgsize:=OS_ADDR
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else
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retcgsize:=def_cgsize(p.rettype.def);
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p.funcret_paraloc[side].reset;
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p.funcret_paraloc[side].Alignment:=std_param_align;
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p.funcret_paraloc[side].size:=retcgsize;
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{ void has no location }
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if is_void(p.rettype.def) then
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exit;
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{ Function return }
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paraloc:=p.funcret_paraloc[side].add_location;
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{ Return in FPU register? }
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if p.rettype.def.deftype=floatdef then
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begin
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paraloc^.loc:=LOC_FPUREGISTER;
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paraloc^.register:=NR_FPU_RESULT_REG;
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end
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{ Return in register? }
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else if not ret_in_param(p.rettype.def,p.proccalloption) then
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begin
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if retcgsize in [OS_64,OS_S64] then
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begin
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{ low }
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paraloc^.loc:=LOC_REGISTER;
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paraloc^.size:=OS_32;
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paraloc^.register:=NR_FUNCTION_RESULT64_LOW_REG;
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{ high }
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paraloc:=p.funcret_paraloc[side].add_location;
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paraloc^.loc:=LOC_REGISTER;
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paraloc^.size:=OS_32;
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paraloc^.register:=NR_FUNCTION_RESULT64_HIGH_REG;
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end
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else
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begin
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paraloc^.loc:=LOC_REGISTER;
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paraloc^.register:=NR_FUNCTION_RETURN_REG;
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end;
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end
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else
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begin
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paraloc^.loc:=LOC_REFERENCE;
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end;
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end;
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function tarmparamanager.create_varargs_paraloc_info(p : tabstractprocdef; varargspara:tvarargspara):longint;
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var
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cur_stack_offset: aword;
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parasize, l: longint;
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curintreg, curfloatreg, curmmreg: tsuperregister;
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hp: tparaitem;
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paraloc: tcgparalocation;
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begin
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init_values(curintreg,curfloatreg,curmmreg,cur_stack_offset);
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result:=create_paraloc_info_intern(p,callerside,tparaitem(p.para.first),curintreg,curfloatreg,curmmreg,cur_stack_offset);
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if (p.proccalloption in [pocall_cdecl,pocall_cppdecl]) then
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{ just continue loading the parameters in the registers }
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result:=create_paraloc_info_intern(p,callerside,tparaitem(varargspara.first),curintreg,curfloatreg,curmmreg,cur_stack_offset)
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else
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internalerror(200410231);
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{
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begin
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hp:=tparaitem(varargspara.first);
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parasize:=cur_stack_offset;
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while assigned(hp) do
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begin
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paraloc.size:=def_cgsize(hp.paratype.def);
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paraloc.lochigh:=LOC_INVALID;
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paraloc.loc:=LOC_REFERENCE;
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paraloc.alignment:=4;
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paraloc.reference.index:=NR_STACK_POINTER_REG;
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l:=push_size(hp.paratyp,hp.paratype.def,p.proccalloption);
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paraloc.reference.offset:=parasize;
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parasize:=parasize+l;
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hp.paraloc[callerside]:=paraloc;
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hp:=tparaitem(hp.next);
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end;
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result := parasize;
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end;
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}
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end;
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begin
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paramanager:=tarmparamanager.create;
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end.
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{
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$Log$
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Revision 1.24 2004-11-01 09:23:01 florian
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* fixed handling of stack parameters on the arm
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Revision 1.23 2004/10/31 12:37:11 florian
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* another couple of arm fixed
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Revision 1.22 2004/10/24 17:32:53 florian
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* fixed several arm compiler bugs
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Revision 1.21 2004/10/24 07:54:25 florian
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* fixed compilation of arm compiler
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Revision 1.20 2004/10/22 16:36:57 florian
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* first arm fixes for new paraloc handling
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Revision 1.19 2004/06/20 08:55:31 florian
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* logs truncated
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Revision 1.18 2004/06/16 20:07:10 florian
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* dwarf branch merged
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Revision 1.17.2.1 2004/06/13 20:38:38 florian
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* fixed floating point register spilling on sparc
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Revision 1.17 2004/03/20 21:11:01 florian
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+ float parameters can be on the stack now as well
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Revision 1.16 2004/03/20 20:55:36 florian
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+ implemented cdecl'd varargs on arm
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+ -dCMEM supported by the compiler
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* label/goto asmsymbol type with -dextdebug fixed
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Revision 1.15 2004/03/07 00:16:59 florian
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* compilation of arm rtl fixed
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}
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