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117 lines
3.9 KiB
ObjectPascal
117 lines
3.9 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,psabiehpi,aasmdata;
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type
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tcpuprocinfo = class(tpsabiehprocinfo)
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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 allocate_got_register(list: tasmlist);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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cgobj,tgobj,paramgr,
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cpubase,
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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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{ 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<=4 then
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result:=Align(tg.direction*tg.lasttemp,min(current_settings.alignment.localalignmax,4))
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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, except
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if a 16 byte aligned stack on i386-linux is used }
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if paramanager.use_fixed_stack and not(target_info.abi=abi_i386_dynalignedstack) then
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para_stack_size := 0;
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end;
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procedure tcpuprocinfo.allocate_got_register(list: tasmlist);
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begin
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if (pi_uses_threadvar in flags) and (tf_section_threadvars in target_info.flags) and (current_settings.tlsmodel in [tlsm_global_dynamic]) then
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begin
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{ FIXME: It is better to use an imaginary register for GOT and
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if EBX is needed for some reason just allocate EBX and
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copy GOT into it before its usage. }
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cg.getcpuregister(list,NR_EBX);
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got := NR_EBX;
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end
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else if cs_create_pic in current_settings.moduleswitches then
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got := cg.getaddressregister(list);
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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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