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a25ebbba3e
o separate information for reading and writing, because e.g. in a
try-block, only the writes to local variables and parameters are
volatile (they have to be committed immediately in case the next
instruction causes an exception)
o for now, only references to absolute memory addresses are marked
as volatile
o the volatily information is (should be) properly maintained throughout
all code generators for all archictures with this patch
o no optimizers or other compiler infrastructure uses the volatility
information yet
o this functionality is not (yet) exposed at the language level, it
is only for internal code generator use right now
git-svn-id: trunk@34996 -
129 lines
4.2 KiB
ObjectPascal
129 lines
4.2 KiB
ObjectPascal
{
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Copyright (c) 2002 by Florian Klaempfl
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Implements the x86-64 specific part of call nodes
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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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unit nx64cal;
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{$i fpcdefs.inc}
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interface
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uses
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symdef,
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ncal,nx86cal;
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type
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tx8664callnode = class(tx86callnode)
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protected
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procedure gen_syscall_para(para: tcallparanode); override;
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procedure extra_call_code;override;
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procedure set_result_location(realresdef: tstoreddef);override;
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public
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procedure do_syscall;override;
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end;
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implementation
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uses
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globtype,
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systems,verbose,cutils,
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cpubase,cgbase,cgutils,cgobj,
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symsym,symcpu,nld,
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aasmbase,aasmtai,aasmdata,aasmcpu;
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{ uses
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globtype,systems,
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cutils,verbose,globals,
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cgbase,cgutils,
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cpubase,paramgr,
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aasmtai,aasmdata,aasmcpu,
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nbas,nmem,nld,ncnv,
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symdef,symsym,symcpu,
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cga,cgobj,cpuinfo;}
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procedure tx8664callnode.do_syscall;
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var
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tmpref: treference;
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begin
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case target_info.system of
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system_x86_64_aros:
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begin
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// one syscall convention for AROS
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current_asmdata.CurrAsmList.concat(tai_comment.create(strpnew('AROS SysCall')));
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reference_reset(tmpref,sizeof(pint),[]);
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tmpref.symbol:=current_asmdata.RefAsmSymbol(tstaticvarsym(tcpuprocdef(procdefinition).libsym).mangledname,AT_FUNCTION);
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cg.getcpuregister(current_asmdata.CurrAsmList,NR_RAX);
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cg.a_load_ref_reg(current_asmdata.CurrAsmList,OS_ADDR,OS_ADDR,tmpref,NR_RAX);
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reference_reset_base(tmpref,NR_RAX,-tprocdef(procdefinition).extnumber,sizeof(pint),[]);
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cg.a_load_ref_reg(current_asmdata.CurrAsmList,OS_ADDR,OS_ADDR,tmpref,NR_RAX);
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cg.a_call_reg(current_asmdata.CurrAsmList,NR_RAX);
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cg.ungetcpuregister(current_asmdata.CurrAsmList,NR_RAX);
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end;
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else
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internalerror(2015062801);
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end;
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end;
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procedure tx8664callnode.gen_syscall_para(para: tcallparanode);
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begin
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{ lib parameter has no special type but proccalloptions must be a syscall }
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para.left:=cloadnode.create(tcpuprocdef(procdefinition).libsym,tcpuprocdef(procdefinition).libsym.owner);
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end;
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procedure tx8664callnode.extra_call_code;
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var
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mmregs : aint;
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begin
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{ x86_64 requires %al to contain the no. SSE regs passed }
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if (cnf_uses_varargs in callnodeflags) and (target_info.system<>system_x86_64_win64) then
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begin
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if assigned(varargsparas) then
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mmregs:=varargsparas.mmregsused
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else
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mmregs:=0;
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current_asmdata.CurrAsmList.concat(taicpu.op_const_reg(A_MOV,S_Q,mmregs,NR_RAX))
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end;
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end;
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procedure tx8664callnode.set_result_location(realresdef: tstoreddef);
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begin
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{ avoid useless "movq %xmm0,%rax" and "movq %rax,%xmm0" instructions
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(which moreover for some reason are not supported by the Darwin
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x86-64 assembler) }
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if assigned(retloc.location) and
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not assigned(retloc.location^.next) and
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(retloc.location^.loc in [LOC_MMREGISTER,LOC_CMMREGISTER]) then
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begin
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location_reset(location,LOC_MMREGISTER,retloc.location^.size);
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location.register:=cg.getmmregister(current_asmdata.CurrAsmList,retloc.location^.size);
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end
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else
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inherited
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end;
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begin
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ccallnode:=tx8664callnode;
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end.
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