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714 lines
28 KiB
ObjectPascal
714 lines
28 KiB
ObjectPascal
{
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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,globals,
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aasmtai,aasmdata,
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cpuinfo,cpubase,cgbase,cgutils,
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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 get_volatile_registers_mm(calloption : tproccalloption):tcpuregisterset;override;
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function push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;override;
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function ret_in_param(def : tdef;calloption : tproccalloption) : boolean;override;
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procedure getintparaloc(calloption : tproccalloption; nr : longint; def : tdef; 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:tvarargsparalist):longint;override;
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function get_funcretloc(p : tabstractprocdef; side: tcallercallee; forcetempdef: tdef): tcgpara;override;
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private
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procedure init_values(var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: aword; var sparesinglereg: tregister);
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function create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee; paras: tparalist;
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var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: aword; var sparesinglereg: tregister; isvariadic: boolean):longint;
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end;
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implementation
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uses
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verbose,systems,cutils,
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rgobj,
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defutil,symsym,symtable;
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function tarmparamanager.get_volatile_registers_int(calloption : tproccalloption):tcpuregisterset;
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begin
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if (target_info.system<>system_arm_darwin) then
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result:=VOLATILE_INTREGISTERS
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else
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result:=VOLATILE_INTREGISTERS_DARWIN;
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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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function tarmparamanager.get_volatile_registers_mm(calloption: tproccalloption): tcpuregisterset;
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begin
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result:=VOLATILE_MMREGISTERS;
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end;
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procedure tarmparamanager.getintparaloc(calloption : tproccalloption; nr : longint; def : tdef; 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:=def_cgsize(def);
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cgpara.intsize:=tcgsize2size[cgpara.size];
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cgpara.alignment:=std_param_align;
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cgpara.def:=def;
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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; isvariadic: boolean) : 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.typ of
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orddef:
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getparaloc:=LOC_REGISTER;
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floatdef:
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if (target_info.abi = abi_eabihf) and
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(not isvariadic) then
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getparaloc:=LOC_MMREGISTER
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else if (calloption in [pocall_cdecl,pocall_cppdecl,pocall_softfloat]) or
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(cs_fp_emulation in current_settings.moduleswitches) or
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(current_settings.fputype in [fpu_vfpv2,fpu_vfpv3,fpu_vfpv3_d16]) then
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{ the ARM eabi also allows passing VFP values via VFP registers,
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but Mac OS X doesn't seem to do that and linux only does it if
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built with the "-mfloat-abi=hard" option }
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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_REGISTER;
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objectdef:
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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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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_REGISTER;
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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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result:=false;
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if varspez in [vs_var,vs_out,vs_constref] 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.typ of
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objectdef:
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result:=is_object(def) and ((varspez=vs_const) or (def.size=0));
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recorddef:
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{ note: should this ever be changed, make sure that const records
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are always passed by reference for calloption=pocall_mwpascal }
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result:=(varspez=vs_const) or (def.size=0);
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variantdef,
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formaldef:
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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:=not is_smallset(def);
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stringdef :
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result:=tstringdef(def).stringtype in [st_shortstring,st_longstring];
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end;
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end;
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function tarmparamanager.ret_in_param(def : tdef;calloption : tproccalloption) : boolean;
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var
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i: longint;
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sym: tsym;
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fpufield: boolean;
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begin
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case def.typ of
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recorddef:
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begin
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result:=def.size>4;
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if not result and
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(target_info.abi in [abi_default,abi_armeb]) then
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begin
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{ in case of the old ARM abi (APCS), a struct is returned in
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a register only if it is simple. And what is a (non-)simple
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struct:
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"A non-simple type is any non-floating-point type of size
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greater than one word (including structures containing only
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floating-point fields), and certain single-word structured
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types."
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(-- ARM APCS documentation)
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So only floating point types or more than one word ->
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definitely non-simple (more than one word is already
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checked above). This includes unions/variant records with
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overlaid floating point and integer fields.
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Smaller than one word struct types are simple if they are
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"integer-like", and:
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"A structure is termed integer-like if its size is less than
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or equal to one word, and the offset of each of its
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addressable subfields is zero."
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(-- ARM APCS documentation)
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An "addressable subfield" is a field of which you can take
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the address, which in practive means any non-bitfield.
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In Pascal, there is no way to express the difference that
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you can have in C between "char" and "int :8". In this
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context, we use the fake distinction that a type defined
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inside the record itself (such as "a: 0..255;") indicates
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a bitpacked field while a field using a different type
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(such as "a: byte;") is not.
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}
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for i:=0 to trecorddef(def).symtable.SymList.count-1 do
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begin
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sym:=tsym(trecorddef(def).symtable.SymList[i]);
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if sym.typ<>fieldvarsym then
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continue;
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{ bitfield -> ignore }
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if (trecordsymtable(trecorddef(def).symtable).usefieldalignment=bit_alignment) and
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(tfieldvarsym(sym).vardef.typ in [orddef,enumdef]) and
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(tfieldvarsym(sym).vardef.owner.defowner=def) then
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continue;
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{ all other fields must be at offset zero }
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if tfieldvarsym(sym).fieldoffset<>0 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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{ floating point field -> also by reference }
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if tfieldvarsym(sym).vardef.typ=floatdef 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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end;
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end;
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end;
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procvardef:
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if not tprocvardef(def).is_addressonly then
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result:=true
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else
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result:=false
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else
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result:=inherited ret_in_param(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; var sparesinglereg: tregister);
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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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sparesinglereg := NR_NO;
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end;
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function tarmparamanager.create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee; paras: tparalist;
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var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: aword; var sparesinglereg: tregister; isvariadic: boolean):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 : tparavarsym;
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loc : tcgloc;
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paracgsize : tcgsize;
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paralen : longint;
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i : integer;
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firstparaloc: boolean;
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procedure assignintreg;
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begin
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{ In case of po_delphi_nested_cc, the parent frame pointer
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is always passed on the stack. }
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if (nextintreg<=RS_R3) and
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(not(vo_is_parentfp in hp.varoptions) or
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not(po_delphi_nested_cc in p.procoptions)) 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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for i:=0 to paras.count-1 do
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begin
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hp:=tparavarsym(paras[i]);
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paradef:=hp.vardef;
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hp.paraloc[side].reset;
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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(paradef) 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.varspez,paradef,p.proccalloption) then
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begin
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paradef:=getpointerdef(paradef);
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loc:=LOC_REGISTER;
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paracgsize := OS_ADDR;
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paralen := tcgsize2size[OS_ADDR];
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end
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else
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begin
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if not is_special_array(paradef) then
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paralen := paradef.size
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else
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paralen := tcgsize2size[def_cgsize(paradef)];
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loc := getparaloc(p.proccalloption,paradef,isvariadic);
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if (paradef.typ in [objectdef,arraydef,recorddef]) and
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not is_special_array(paradef) and
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(hp.varspez in [vs_value,vs_const]) then
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paracgsize := int_cgsize(paralen)
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else
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begin
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paracgsize:=def_cgsize(paradef);
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{ for things like formaldef }
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if (paracgsize=OS_NO) then
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begin
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paracgsize:=OS_ADDR;
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paralen:=tcgsize2size[OS_ADDR];
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paradef:=voidpointertype;
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end;
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end
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end;
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hp.paraloc[side].size:=paracgsize;
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hp.paraloc[side].Alignment:=std_param_align;
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hp.paraloc[side].intsize:=paralen;
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hp.paraloc[side].def:=paradef;
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firstparaloc:=true;
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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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if (loc=LOC_REGISTER) and (paracgsize in [OS_F32,OS_F64,OS_F80]) then
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case paracgsize of
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OS_F32:
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paraloc^.size:=OS_32;
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OS_F64:
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paraloc^.size:=OS_32;
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else
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internalerror(2005082901);
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end
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else if (paracgsize in [OS_NO,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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{ align registers for eabi }
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if (target_info.abi in [abi_eabi,abi_eabihf]) and
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firstparaloc and
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(paradef.alignment=8) then
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begin
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if (nextintreg in [RS_R1,RS_R3]) then
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inc(nextintreg)
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else if nextintreg>RS_R3 then
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stack_offset:=align(stack_offset,8);
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end;
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{ this is not abi compliant
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why? (FK) }
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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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{ LOC_REFERENCE always contains everything that's left }
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paraloc^.loc:=LOC_REFERENCE;
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paraloc^.size:=int_cgsize(paralen);
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if (side=callerside) then
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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,align(paralen,4));
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paralen:=0;
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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_MMREGISTER:
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begin
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if (nextmmreg<=RS_D7) or
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((paraloc^.size = OS_F32) and
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(sparesinglereg<>NR_NO)) then
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begin
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paraloc^.loc:=LOC_MMREGISTER;
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case paraloc^.size of
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OS_F32:
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if sparesinglereg = NR_NO then
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begin
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paraloc^.register:=newreg(R_MMREGISTER,nextmmreg,R_SUBFS);
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sparesinglereg:=newreg(R_MMREGISTER,nextmmreg-RS_S0+RS_S1,R_SUBFS);
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inc(nextmmreg);
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end
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else
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begin
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paraloc^.register:=sparesinglereg;
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sparesinglereg := NR_NO;
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end;
|
|
OS_F64:
|
|
begin
|
|
paraloc^.register:=newreg(R_MMREGISTER,nextmmreg,R_SUBFD);
|
|
inc(nextmmreg);
|
|
end;
|
|
else
|
|
internalerror(2012031601);
|
|
end;
|
|
end
|
|
else
|
|
begin
|
|
{ once a floating point parameters has been placed
|
|
on the stack we must not pass any more in vfp regs
|
|
even if there is a single precision register still
|
|
free}
|
|
sparesinglereg := NR_NO;
|
|
{ LOC_REFERENCE always contains everything that's left }
|
|
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_REFERENCE:
|
|
begin
|
|
if push_addr_param(hp.varspez,paradef,p.proccalloption) then
|
|
begin
|
|
paraloc^.size:=OS_ADDR;
|
|
assignintreg
|
|
end
|
|
else
|
|
begin
|
|
{ align stack for eabi }
|
|
if (target_info.abi in [abi_eabi,abi_eabihf]) and
|
|
firstparaloc and
|
|
(paradef.alignment=8) then
|
|
stack_offset:=align(stack_offset,8);
|
|
|
|
paraloc^.size:=paracgsize;
|
|
paraloc^.loc:=LOC_REFERENCE;
|
|
paraloc^.reference.index:=NR_STACK_POINTER_REG;
|
|
paraloc^.reference.offset:=stack_offset;
|
|
inc(stack_offset,align(paralen,4));
|
|
paralen:=0
|
|
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;
|
|
{ on non-Darwin, the framepointer contains the value
|
|
of the stack pointer on entry. On Darwin, the
|
|
framepointer points to the previously saved
|
|
framepointer (which is followed only by the saved
|
|
return address -> framepointer + 4 = stack pointer
|
|
on entry }
|
|
if not(target_info.system in systems_darwin) then
|
|
inc(paraloc^.reference.offset,4)
|
|
else
|
|
inc(paraloc^.reference.offset,8);
|
|
end;
|
|
end;
|
|
dec(paralen,tcgsize2size[paraloc^.size]);
|
|
firstparaloc:=false
|
|
end;
|
|
end;
|
|
curintreg:=nextintreg;
|
|
curfloatreg:=nextfloatreg;
|
|
curmmreg:=nextmmreg;
|
|
cur_stack_offset:=stack_offset;
|
|
result:=cur_stack_offset;
|
|
end;
|
|
|
|
|
|
function tarmparamanager.get_funcretloc(p : tabstractprocdef; side: tcallercallee; forcetempdef: tdef): tcgpara;
|
|
var
|
|
paraloc : pcgparalocation;
|
|
retcgsize : tcgsize;
|
|
begin
|
|
if set_common_funcretloc_info(p,forcetempdef,retcgsize,result) then
|
|
exit;
|
|
|
|
paraloc:=result.add_location;
|
|
{ Return in FPU register? }
|
|
if result.def.typ=floatdef then
|
|
begin
|
|
if target_info.abi = abi_eabihf then
|
|
begin
|
|
paraloc^.loc:=LOC_MMREGISTER;
|
|
case retcgsize of
|
|
OS_64,
|
|
OS_F64:
|
|
begin
|
|
paraloc^.register:=NR_MM_RESULT_REG;
|
|
end;
|
|
OS_32,
|
|
OS_F32:
|
|
begin
|
|
paraloc^.register:=NR_S0;
|
|
end;
|
|
else
|
|
internalerror(2012032501);
|
|
end;
|
|
paraloc^.size:=retcgsize;
|
|
end
|
|
else if (p.proccalloption in [pocall_softfloat]) or
|
|
(cs_fp_emulation in current_settings.moduleswitches) or
|
|
(current_settings.fputype in [fpu_vfpv2,fpu_vfpv3,fpu_vfpv3_d16]) then
|
|
begin
|
|
case retcgsize of
|
|
OS_64,
|
|
OS_F64:
|
|
begin
|
|
paraloc^.loc:=LOC_REGISTER;
|
|
if target_info.endian = endian_big then
|
|
paraloc^.register:=NR_FUNCTION_RESULT64_HIGH_REG
|
|
else
|
|
paraloc^.register:=NR_FUNCTION_RESULT64_LOW_REG;
|
|
paraloc^.size:=OS_32;
|
|
paraloc:=result.add_location;
|
|
paraloc^.loc:=LOC_REGISTER;
|
|
if target_info.endian = endian_big then
|
|
paraloc^.register:=NR_FUNCTION_RESULT64_LOW_REG
|
|
else
|
|
paraloc^.register:=NR_FUNCTION_RESULT64_HIGH_REG;
|
|
paraloc^.size:=OS_32;
|
|
end;
|
|
OS_32,
|
|
OS_F32:
|
|
begin
|
|
paraloc^.loc:=LOC_REGISTER;
|
|
paraloc^.register:=NR_FUNCTION_RETURN_REG;
|
|
paraloc^.size:=OS_32;
|
|
end;
|
|
else
|
|
internalerror(2005082603);
|
|
end;
|
|
end
|
|
else
|
|
begin
|
|
paraloc^.loc:=LOC_FPUREGISTER;
|
|
paraloc^.register:=NR_FPU_RESULT_REG;
|
|
paraloc^.size:=retcgsize;
|
|
end;
|
|
end
|
|
{ Return in register }
|
|
else
|
|
begin
|
|
if retcgsize in [OS_64,OS_S64] then
|
|
begin
|
|
paraloc^.loc:=LOC_REGISTER;
|
|
if target_info.endian = endian_big then
|
|
paraloc^.register:=NR_FUNCTION_RESULT64_HIGH_REG
|
|
else
|
|
paraloc^.register:=NR_FUNCTION_RESULT64_LOW_REG;
|
|
paraloc^.size:=OS_32;
|
|
paraloc:=result.add_location;
|
|
paraloc^.loc:=LOC_REGISTER;
|
|
if target_info.endian = endian_big then
|
|
paraloc^.register:=NR_FUNCTION_RESULT64_LOW_REG
|
|
else
|
|
paraloc^.register:=NR_FUNCTION_RESULT64_HIGH_REG;
|
|
paraloc^.size:=OS_32;
|
|
end
|
|
else
|
|
begin
|
|
paraloc^.loc:=LOC_REGISTER;
|
|
paraloc^.register:=NR_FUNCTION_RETURN_REG;
|
|
if (result.intsize<>3) then
|
|
paraloc^.size:=retcgsize
|
|
else
|
|
paraloc^.size:=OS_32;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
function tarmparamanager.create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;
|
|
var
|
|
cur_stack_offset: aword;
|
|
curintreg, curfloatreg, curmmreg: tsuperregister;
|
|
sparesinglereg:tregister;
|
|
begin
|
|
init_values(curintreg,curfloatreg,curmmreg,cur_stack_offset,sparesinglereg);
|
|
|
|
result:=create_paraloc_info_intern(p,side,p.paras,curintreg,curfloatreg,curmmreg,cur_stack_offset,sparesinglereg,false);
|
|
|
|
create_funcretloc_info(p,side);
|
|
end;
|
|
|
|
|
|
function tarmparamanager.create_varargs_paraloc_info(p : tabstractprocdef; varargspara:tvarargsparalist):longint;
|
|
var
|
|
cur_stack_offset: aword;
|
|
curintreg, curfloatreg, curmmreg: tsuperregister;
|
|
sparesinglereg:tregister;
|
|
begin
|
|
init_values(curintreg,curfloatreg,curmmreg,cur_stack_offset,sparesinglereg);
|
|
|
|
result:=create_paraloc_info_intern(p,callerside,p.paras,curintreg,curfloatreg,curmmreg,cur_stack_offset,sparesinglereg,true);
|
|
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,sparesinglereg,true)
|
|
else
|
|
internalerror(200410231);
|
|
end;
|
|
|
|
begin
|
|
paramanager:=tarmparamanager.create;
|
|
end.
|