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103 lines
3.4 KiB
ObjectPascal
103 lines
3.4 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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globtype,cutils,
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procinfo,cpuinfo,psub;
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type
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tarmprocinfo = class(tcgprocinfo)
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floatregstart : aint;
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// procedure handle_body_start;override;
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// procedure after_pass1;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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end;
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implementation
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uses
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globals,systems,
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cpubase,
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aasmtai,aasmdata,
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tgobj,
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symconst,symsym,paramgr,
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cgbase,
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cgobj;
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procedure tarmprocinfo.set_first_temp_offset;
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begin
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{ We allocate enough space to save all registers because we can't determine
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the necessary space because the used registers aren't known before
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secondpass is run. Even worse, patching
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the local offsets after generating the code could cause trouble because
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"shifter" constants could change to non-"shifter" constants. This
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is especially a problem when taking the address of a local. For now,
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this extra memory should hurt less than generating all local contants with offsets
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>256 as non shifter constants }
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if tg.direction = -1 then
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tg.setfirsttemp(-12-28)
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else
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tg.setfirsttemp(maxpushedparasize);
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end;
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function tarmprocinfo.calc_stackframe_size:longint;
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var
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firstfloatreg,lastfloatreg,
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r : byte;
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floatsavesize : aword;
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begin
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maxpushedparasize:=align(maxpushedparasize,max(current_settings.alignment.localalignmin,4));
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firstfloatreg:=RS_NO;
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{ save floating point registers? }
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for r:=RS_F0 to RS_F7 do
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if r in cg.rg[R_FPUREGISTER].used_in_proc-paramanager.get_volatile_registers_fpu(pocall_stdcall) then
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begin
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if firstfloatreg=RS_NO then
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firstfloatreg:=r;
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lastfloatreg:=r;
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end;
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if firstfloatreg<>RS_NO then
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floatsavesize:=(lastfloatreg-firstfloatreg+1)*12
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else
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floatsavesize:=0;
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floatsavesize:=align(floatsavesize,max(current_settings.alignment.localalignmin,4));
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result:=Align(tg.direction*tg.lasttemp,max(current_settings.alignment.localalignmin,4))+maxpushedparasize+floatsavesize;
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floatregstart:=tg.direction*result+maxpushedparasize;
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if tg.direction=1 then
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dec(floatregstart,floatsavesize);
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end;
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begin
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cprocinfo:=tarmprocinfo;
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end.
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