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{
Copyright (c) 2002-2006 by Florian Klaempfl
This unit contains the CPU specific part of tprocinfo
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
{ This unit contains the CPU specific part of tprocinfo. }
unit cpupi;
{$i fpcdefs.inc}
interface
uses
globtype,
psub,procinfo,aasmbase,aasmdata;
type
tcpuprocinfo = class(tcgprocinfo)
private
scopes: TAsmList;
scopecount: longint;
unwindflags: byte;
public
procedure set_first_temp_offset;override;
procedure generate_parameter_info;override;
function calc_stackframe_size:longint;override;
procedure add_finally_scope(startlabel,endlabel,handler:TAsmSymbol;implicit:Boolean);
procedure add_except_scope(trylabel,exceptlabel,endlabel,filter:TAsmSymbol);
procedure dump_scopes(list:TAsmList);
destructor destroy;override;
end;
function x86_64_use_ms_abi(proccall: tproccalloption): boolean;
implementation
uses
systems,
globals,
cutils,
symconst,
symtable,
aasmtai,
tgobj,
fmodule;
const
SCOPE_FINALLY=0;
SCOPE_CATCHALL=1;
SCOPE_IMPLICIT=2;
procedure tcpuprocinfo.set_first_temp_offset;
begin
if target_info.system=system_x86_64_win64 then
begin
{ Fixes the case when there are calls done by low-level means
(cg.a_call_name) but no child callnode }
if (pi_do_call in flags) and
not (po_nostackframe in procdef.procoptions) then
allocate_push_parasize(32);
if not(po_assembler in procdef.procoptions) and
(tg.direction > 0) then
{ maxpushedparasize already contains 32 bytes of spilling area }
tg.setfirsttemp(tg.direction*maxpushedparasize);
end
else
tg.setfirsttemp(tg.direction*maxpushedparasize);
end;
procedure tcpuprocinfo.generate_parameter_info;
begin
inherited generate_parameter_info;
if target_info.system=system_x86_64_win64 then
para_stack_size:=0;
end;
function tcpuprocinfo.calc_stackframe_size:longint;
begin
maxpushedparasize:=align(maxpushedparasize,max(current_settings.alignment.localalignmin,16));
{ Note 1: when tg.direction>0, tg.lasttemp is already offset by maxpushedparasize
(because tg.setfirsttemp also sets lasttemp)
Note 2: Align to 8 bytes here. The final 16-byte alignment is handled in
tcgx86.g_proc_entry, which considers saved rbp and the misalignment
caused by the call itself. }
if (tg.direction>0) then
result:=Align(tg.lasttemp,8)
else
result:=Align(tg.direction*tg.lasttemp+maxpushedparasize,8);
end;
procedure tcpuprocinfo.add_finally_scope(startlabel,endlabel,handler:TAsmSymbol;implicit:Boolean);
begin
unwindflags:=unwindflags or 2;
if implicit then { also needs catch functionality }
unwindflags:=unwindflags or 1;
inc(scopecount);
if scopes=nil then
scopes:=TAsmList.Create;
if implicit then
scopes.concat(tai_const.create_32bit(SCOPE_IMPLICIT))
else
scopes.concat(tai_const.create_32bit(SCOPE_FINALLY));
scopes.concat(tai_const.create_rva_sym(startlabel));
scopes.concat(tai_const.create_rva_sym(endlabel));
scopes.concat(tai_const.create_rva_sym(handler));
end;
procedure tcpuprocinfo.add_except_scope(trylabel,exceptlabel,endlabel,filter:TAsmSymbol);
begin
unwindflags:=unwindflags or 3;
inc(scopecount);
if scopes=nil then
scopes:=TAsmList.Create;
if Assigned(filter) then
scopes.concat(tai_const.create_rva_sym(filter))
else
scopes.concat(tai_const.create_32bit(SCOPE_CATCHALL));
scopes.concat(tai_const.create_rva_sym(trylabel));
scopes.concat(tai_const.create_rva_sym(exceptlabel));
scopes.concat(tai_const.create_rva_sym(endlabel));
end;
procedure tcpuprocinfo.dump_scopes(list: TAsmList);
var
hdir: tai_seh_directive;
begin
if (scopecount=0) then
exit;
hdir:=cai_seh_directive.create_name(ash_handler,'__FPC_specific_handler');
if not systemunit.iscurrentunit then
current_module.add_extern_asmsym('__FPC_specific_handler',AB_EXTERNAL,AT_FUNCTION);
hdir.data.flags:=unwindflags;
list.concat(hdir);
list.concat(cai_seh_directive.create(ash_handlerdata));
inc(list.section_count);
list.concat(tai_const.create_32bit(scopecount));
list.concatlist(scopes);
{ return to text, required for GAS compatibility }
{ This creates a tai_align which is redundant here (although harmless) }
new_section(list,sec_code,lower(procdef.mangledname),0);
end;
destructor tcpuprocinfo.destroy;
begin
scopes.free;
inherited destroy;
end;
function x86_64_use_ms_abi(proccall: tproccalloption): boolean;
begin
result:=
((target_info.system=system_x86_64_win64) and
not(proccall in [pocall_sysv_abi_default,pocall_sysv_abi_cdecl])) or
(proccall in [pocall_ms_abi_default,pocall_ms_abi_cdecl]);
end;
begin
cprocinfo:=tcpuprocinfo;
end.
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