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131 lines
4.0 KiB
ObjectPascal
131 lines
4.0 KiB
ObjectPascal
{
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Copyright (c) 2002 by Florian Klaempfl
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This unit contains the CPU specific part of tprocinfo
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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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{ This unit contains the CPU specific part of tprocinfo. }
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unit cpupi;
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{$i fpcdefs.inc}
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interface
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uses
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psub,procinfo,aasmdata;
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type
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tcpuprocinfo = class(tcgprocinfo)
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private
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procedure insert_8087_fwaits(list : TAsmList);
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public
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constructor create(aparent:tprocinfo);override;
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procedure set_first_temp_offset;override;
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function calc_stackframe_size:longint;override;
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procedure generate_parameter_info;override;
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procedure postprocess_code;override;
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end;
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implementation
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uses
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cutils,
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systems,globals,globtype,
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aasmtai,aasmcpu,
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cgobj,tgobj,paramgr,
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cpubase,cpuinfo,
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cgutils,
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symconst;
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constructor tcpuprocinfo.create(aparent:tprocinfo);
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begin
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inherited create(aparent);
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got:=NR_EBX;
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end;
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procedure tcpuprocinfo.set_first_temp_offset;
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begin
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if paramanager.use_fixed_stack then
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begin
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if not(po_assembler in procdef.procoptions) and
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(tg.direction > 0) then
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tg.setfirsttemp(tg.direction*maxpushedparasize);
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if (tg.direction < 0) and
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not(po_nostackframe in procdef.procoptions) then
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{ compensate for the return address and the "pushl %ebp" }
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tg.setalignmentmismatch(sizeof(pint)*2);
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end;
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end;
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function tcpuprocinfo.calc_stackframe_size:longint;
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begin
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{ ???:
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align to 4 bytes at least
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otherwise all those subl $2,%esp are meaningless PM }
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if target_info.stackalign<=2 then
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result:=Align(tg.direction*tg.lasttemp,min(current_settings.alignment.localalignmax,2))
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else
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{ aligned during stack frame allocation, because also depends number
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of saved registers }
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result:=tg.direction*tg.lasttemp+maxpushedparasize;
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end;
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procedure tcpuprocinfo.generate_parameter_info;
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begin
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inherited generate_parameter_info;
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{ Para_stack_size is only used to determine how many bytes to remove }
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{ from the stack at the end of the procedure (in the "ret $xx"). }
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{ If the stack is fixed, nothing has to be removed by the callee }
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if paramanager.use_fixed_stack then
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para_stack_size := 0;
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end;
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procedure tcpuprocinfo.insert_8087_fwaits(list : TAsmList);
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var
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curtai: tai;
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begin
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curtai:=tai(list.First);
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while assigned(curtai) do
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begin
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if (curtai.typ=ait_instruction)
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and requires_fwait_on_8087(taicpu(curtai).opcode) then
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list.InsertBefore(taicpu.op_none(A_FWAIT),curtai);
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curtai:=tai(curtai.Next);
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end;
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end;
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procedure tcpuprocinfo.postprocess_code;
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begin
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{ nickysn note: I don't know if the 187 requires FWAIT before
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every instruction like the 8087, so I'm including it just in case }
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if current_settings.cputype<=cpu_186 then
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insert_8087_fwaits(aktproccode);
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end;
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begin
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cprocinfo:=tcpuprocinfo;
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end.
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