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48b57c2f9a
determine whether to issue a near or a far call in ti8086callnode.do_call_ref. This will allow adding support for near and far procvars in any memory model. git-svn-id: trunk@38594 -
133 lines
4.3 KiB
ObjectPascal
133 lines
4.3 KiB
ObjectPascal
{
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Copyright (c) 1998-2002 by Florian Klaempfl
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Generate i8086 assembler for in 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 n8086cal;
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{$i fpcdefs.inc}
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interface
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{ $define AnsiStrRef}
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uses
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parabase,
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nx86cal,cgutils;
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type
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ti8086callnode = class(tx86callnode)
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protected
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procedure pop_parasize(pop_size:longint);override;
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procedure extra_interrupt_code;override;
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procedure extra_call_ref_code(var ref: treference);override;
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function do_call_ref(ref: treference): tcgpara;override;
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end;
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implementation
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uses
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globtype,systems,
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cutils,verbose,globals,
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cgbase,
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cpubase,paramgr,
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aasmtai,aasmdata,aasmcpu,
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ncal,nbas,nmem,nld,ncnv,
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hlcgobj,
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symcpu,
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cga,cgobj,cgx86,cpuinfo;
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{*****************************************************************************
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TI8086CALLNODE
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*****************************************************************************}
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procedure ti8086callnode.extra_interrupt_code;
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begin
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emit_none(A_PUSHF,S_W);
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if current_settings.x86memorymodel in x86_near_code_models then
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emit_reg(A_PUSH,S_W,NR_CS);
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end;
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procedure ti8086callnode.pop_parasize(pop_size:longint);
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var
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hreg : tregister;
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begin
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if (paramanager.use_fixed_stack) then
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begin
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{ very weird: in this case the callee does a "ret $4" and the }
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{ caller immediately a "subl $4,%esp". Possibly this is for }
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{ use_fixed_stack code to be able to transparently call }
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{ old-style code (JM) }
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dec(pop_size,pushedparasize);
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if (pop_size < 0) then
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current_asmdata.CurrAsmList.concat(taicpu.op_const_reg(A_SUB,S_W,-pop_size,NR_SP));
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exit;
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end;
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{ better than an add on all processors }
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if pop_size=2 then
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begin
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hreg:=cg.getintregister(current_asmdata.CurrAsmList,OS_INT);
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current_asmdata.CurrAsmList.concat(taicpu.op_reg(A_POP,S_W,hreg));
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end
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{ the pentium has two pipes and pop reg is pairable }
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{ but the registers must be different! }
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else
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if pop_size<>0 then
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current_asmdata.CurrAsmList.concat(taicpu.op_const_reg(A_ADD,S_W,pop_size,NR_SP));
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end;
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procedure ti8086callnode.extra_call_ref_code(var ref: treference);
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begin
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if (ref.base<>NR_NO) and (ref.base<>NR_BP) then
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begin
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cg.getcpuregister(current_asmdata.CurrAsmList,NR_BX);
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cg.a_load_reg_reg(current_asmdata.CurrAsmList,OS_16,OS_16,ref.base,NR_BX);
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ref.base:=NR_BX;
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cg.ungetcpuregister(current_asmdata.CurrAsmList,NR_BX);
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end;
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if ref.index<>NR_NO then
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begin
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cg.getcpuregister(current_asmdata.CurrAsmList,NR_SI);
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cg.a_load_reg_reg(current_asmdata.CurrAsmList,OS_16,OS_16,ref.index,NR_SI);
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ref.index:=NR_SI;
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cg.ungetcpuregister(current_asmdata.CurrAsmList,NR_SI);
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end;
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end;
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function ti8086callnode.do_call_ref(ref: treference): tcgpara;
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begin
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if is_proc_far(procdefinition) then
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current_asmdata.CurrAsmList.concat(taicpu.op_ref(A_CALL,S_FAR,ref))
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else
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current_asmdata.CurrAsmList.concat(taicpu.op_ref(A_CALL,S_NO,ref));
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result:=hlcg.get_call_result_cgpara(procdefinition,typedef)
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end;
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begin
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ccallnode:=ti8086callnode;
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end.
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