{ Copyright (c) 1998-2002 by Florian Klaempfl Calling conventions for the SPARC 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, cclasses, aasmtai,aasmdata, cpubase,cpuinfo, symconst,symbase,symsym,symtype,symdef,paramgr,parabase,cgbase; type TSparcParaManager=class(TParaManager) function push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;override; function get_volatile_registers_int(calloption : tproccalloption):TCpuRegisterSet;override; function get_volatile_registers_fpu(calloption : tproccalloption):TCpuRegisterSet;override; {Returns a structure giving the information on the storage of the parameter (which must be an integer parameter) @param(nr Parameter number of routine, starting from 1)} procedure getintparaloc(calloption : tproccalloption; nr : longint;var cgpara : TCGPara);override; function create_paraloc_info(p : TAbstractProcDef; side: tcallercallee):longint;override; function create_varargs_paraloc_info(p : TAbstractProcDef; varargspara:tvarargsparalist):longint;override; private procedure create_funcretloc_info(p : tabstractprocdef; side: tcallercallee); procedure create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee; paras: tparalist; var intparareg,parasize:longint); end; implementation uses cutils,verbose,systems, defutil, cgutils,cgobj; type tparasupregs = array[0..5] of tsuperregister; pparasupregs = ^tparasupregs; const paraoutsupregs : tparasupregs = (RS_O0,RS_O1,RS_O2,RS_O3,RS_O4,RS_O5); parainsupregs : tparasupregs = (RS_I0,RS_I1,RS_I2,RS_I3,RS_I4,RS_I5); function TSparcParaManager.get_volatile_registers_int(calloption : tproccalloption):TCpuRegisterSet; begin result:=[RS_G1,RS_O0,RS_O1,RS_O2,RS_O3,RS_O4,RS_O5,RS_O6,RS_O7]; end; function tsparcparamanager.get_volatile_registers_fpu(calloption : tproccalloption):TCpuRegisterSet; begin result:=[RS_F0..RS_F31]; end; procedure TSparcParaManager.GetIntParaLoc(calloption : tproccalloption; nr : longint;var cgpara : tcgpara); var paraloc : pcgparalocation; begin if nr<1 then InternalError(2002100806); cgpara.reset; cgpara.size:=OS_ADDR; cgpara.intsize:=sizeof(pint); cgpara.alignment:=std_param_align; paraloc:=cgpara.add_location; with paraloc^ do begin { The six first parameters are passed into registers } dec(nr); if nr<6 then begin loc:=LOC_REGISTER; register:=newreg(R_INTREGISTER,(RS_O0+nr),R_SUBWHOLE); end else begin { The other parameters are passed on the stack } loc:=LOC_REFERENCE; reference.index:=NR_STACK_POINTER_REG; reference.offset:=92+(nr-6)*4; end; size:=OS_INT; end; end; { true if a parameter is too large to copy and only the address is pushed } function tsparcparamanager.push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean; begin result:=false; { var,out always require address } if varspez in [vs_var,vs_out] then begin result:=true; exit; end; case def.typ of arraydef: result:=(tarraydef(def).highrange>=tarraydef(def).lowrange) or is_open_array(def) or is_array_of_const(def) or is_array_constructor(def); recorddef, variantdef, formaldef : result:=true; objectdef : result:=is_object(def); stringdef : result:=(tstringdef(def).stringtype in [st_shortstring,st_longstring]); procvardef : result:=(po_methodpointer in tprocvardef(def).procoptions); setdef : result:=not is_smallset(def); end; end; procedure tsparcparamanager.create_funcretloc_info(p : tabstractprocdef; side: tcallercallee); var retcgsize : tcgsize; begin { Constructors return self instead of a boolean } if (p.proctypeoption=potype_constructor) then retcgsize:=OS_ADDR else retcgsize:=def_cgsize(p.returndef); location_reset(p.funcretloc[side],LOC_INVALID,OS_NO); p.funcretloc[side].size:=retcgsize; { void has no location } if is_void(p.returndef) then begin p.funcretloc[side].loc:=LOC_VOID; exit; end; { Return is passed as var parameter } if ret_in_param(p.returndef,p.proccalloption) then begin p.funcretloc[side].loc:=LOC_REFERENCE; p.funcretloc[side].size:=retcgsize; exit; end; { Return in FPU register? } if p.returndef.typ=floatdef then begin p.funcretloc[side].loc:=LOC_FPUREGISTER; p.funcretloc[side].register:=NR_FPU_RESULT_REG; if retcgsize=OS_F64 then setsubreg(p.funcretloc[side].register,R_SUBFD); p.funcretloc[side].size:=retcgsize; end else { Return in register } begin {$ifndef cpu64bitaddr} if retcgsize in [OS_64,OS_S64] then begin p.funcretloc[side].loc:=LOC_REGISTER; { high } if (side=callerside) or (po_inline in p.procoptions) then p.funcretloc[side].register64.reghi:=NR_FUNCTION_RESULT64_HIGH_REG else p.funcretloc[side].register64.reghi:=NR_FUNCTION_RETURN64_HIGH_REG; { low } if (side=callerside) or (po_inline in p.procoptions) then p.funcretloc[side].register64.reglo:=NR_FUNCTION_RESULT64_LOW_REG else p.funcretloc[side].register64.reglo:=NR_FUNCTION_RETURN64_LOW_REG; end else {$endif not cpu64bitaddr} begin p.funcretloc[side].loc:=LOC_REGISTER; p.funcretloc[side].size:=retcgsize; if (side=callerside) then p.funcretloc[side].register:=newreg(R_INTREGISTER,RS_FUNCTION_RESULT_REG,cgsize2subreg(retcgsize)) else p.funcretloc[side].register:=newreg(R_INTREGISTER,RS_FUNCTION_RETURN_REG,cgsize2subreg(retcgsize)); end; end; end; procedure tsparcparamanager.create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee;paras:tparalist; var intparareg,parasize:longint); var paraloc : pcgparalocation; i : integer; hp : tparavarsym; paracgsize : tcgsize; hparasupregs : pparasupregs; paralen : longint; begin if side=callerside then hparasupregs:=@paraoutsupregs else hparasupregs:=@parainsupregs; for i:=0 to paras.count-1 do begin hp:=tparavarsym(paras[i]); { currently only support C-style array of const, there should be no location assigned to the vararg array itself } if (p.proccalloption in [pocall_cdecl,pocall_cppdecl]) and is_array_of_const(hp.vardef) 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_G0; paraloc^.size:=OS_ADDR; break; end; if push_addr_param(hp.varspez,hp.vardef,p.proccalloption) then paracgsize:=OS_ADDR else begin paracgsize:=def_cgSize(hp.vardef); if paracgsize=OS_NO then paracgsize:=OS_ADDR; end; hp.paraloc[side].reset; hp.paraloc[side].size:=paracgsize; if (side = callerside) then hp.paraloc[side].Alignment:=std_param_align else hp.paraloc[side].Alignment:=hp.vardef.alignment; paralen:=tcgsize2size[paracgsize]; hp.paraloc[side].intsize:=paralen; while paralen>0 do begin paraloc:=hp.paraloc[side].add_location; { Floats are passed in int registers, We can allocate at maximum 32 bits per register } if paracgsize in [OS_64,OS_S64,OS_F32,OS_F64] then paraloc^.size:=OS_32 else paraloc^.size:=paracgsize; { ret in param? } if vo_is_funcret in hp.varoptions then begin paraloc^.loc:=LOC_REFERENCE; if side=callerside then paraloc^.reference.index:=NR_STACK_POINTER_REG else paraloc^.reference.index:=NR_FRAME_POINTER_REG; paraloc^.reference.offset:=64; end else if (intparareg<=high(tparasupregs)) then begin paraloc^.loc:=LOC_REGISTER; paraloc^.register:=newreg(R_INTREGISTER,hparasupregs^[intparareg],R_SUBWHOLE); inc(intparareg); end else begin paraloc^.loc:=LOC_REFERENCE; if side=callerside then paraloc^.reference.index:=NR_STACK_POINTER_REG else paraloc^.reference.index:=NR_FRAME_POINTER_REG; paraloc^.reference.offset:=target_info.first_parm_offset+parasize; { Parameters are aligned at 4 bytes } inc(parasize,align(tcgsize2size[paraloc^.size],sizeof(pint))); end; dec(paralen,tcgsize2size[paraloc^.size]); end; end; end; function TSparcParaManager.create_varargs_paraloc_info(p : tabstractprocdef; varargspara:tvarargsparalist):longint; var intparareg, parasize : longint; begin intparareg:=0; parasize:=0; { calculate the registers for the normal parameters } create_paraloc_info_intern(p,callerside,p.paras,intparareg,parasize); { append the varargs } create_paraloc_info_intern(p,callerside,varargspara,intparareg,parasize); result:=parasize; end; function tsparcparamanager.create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint; var intparareg, parasize : longint; begin intparareg:=0; parasize:=0; create_paraloc_info_intern(p,side,p.paras,intparareg,parasize); { Create Function result paraloc } create_funcretloc_info(p,side); { We need to return the size allocated on the stack } result:=parasize; end; begin ParaManager:=TSparcParaManager.create; end.