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{
Copyright (c) 1998-2018 by Florian Klaempfl
Generate arm assembler for load nodes
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.
****************************************************************************
}
unit narmld;
{$i fpcdefs.inc}
interface
uses
globtype,
symsym,
node,ncgld,pass_1,aasmbase;
type
tarmloadnode = class(tcgloadnode)
procedure generate_threadvar_access(gvs : tstaticvarsym); override;
end;
implementation
uses
globals,verbose,
cgbase,cgobj,cgutils,
aasmdata,aasmcpu,
systems,
symcpu,symdef,
nld,
cpubase,
parabase,
procinfo;
{*****************************************************************************
TARMLOADNODE
*****************************************************************************}
procedure tarmloadnode.generate_threadvar_access(gvs: tstaticvarsym);
var
href: treference;
hregister : tregister;
handled: boolean;
l : TAsmLabel;
begin
handled:=false;
if tf_section_threadvars in target_info.flags then
begin
if target_info.system in [system_arm_linux] then
begin
if not(pi_uses_threadvar in current_procinfo.flags) then
internalerror(2012012101);
case current_settings.tlsmodel of
tlsm_global_dynamic:
begin
{$ifdef use_tls_dialect_gnu}
current_asmdata.getjumplabel(l);
reference_reset_symbol(href,current_asmdata.RefAsmSymbol(gvs.mangledname,AT_TLS),-8,sizeof(AInt),[]);
href.refaddr:=addr_tlsgd;
href.relsymbol:=l;
hregister:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_loadaddr_ref_reg(current_asmdata.CurrAsmList,href,hregister);
cg.a_label(current_asmdata.CurrAsmList,l);
cg.getcpuregister(current_asmdata.CurrAsmList,NR_R0);
cg.a_op_reg_reg_reg(current_asmdata.CurrAsmList,OP_ADD,OS_ADDR,hregister,NR_PC,NR_R0);
cg.g_call(current_asmdata.CurrAsmList,'__tls_get_addr');
cg.ungetcpuregister(current_asmdata.CurrAsmList,NR_R0);
hregister:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_load_reg_reg(current_asmdata.CurrAsmList,OS_ADDR,OS_ADDR,NR_R0,hregister);
reference_reset(location.reference,location.reference.alignment,location.reference.volatility);
location.reference.base:=hregister;
{$else use_tls_dialect_gnu}
{ On arm, we use the gnu2 tls dialect. It has the advantage that it can be relaxed (optimized) by the linker,
this is not possible with the gnu tls dialect.
gnu2 is proposed and documented in
Glauber de Oliveira Costa, Alexandre Oliva: Speeding Up Thread-Local Storage Access in DynamicLibraries in the ARM platform, 2006.
Link: https://www.fsfla.org/~lxoliva/writeups/TLS/paper-lk2006.pdf
}
current_asmdata.getjumplabel(l);
reference_reset_symbol(href,current_asmdata.RefAsmSymbol(gvs.mangledname,AT_TLS),0,sizeof(AInt),[]);
href.refaddr:=addr_tlsdesc;
href.relsymbol:=l;
hregister:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.getcpuregister(current_asmdata.CurrAsmList,NR_R0);
cg.a_loadaddr_ref_reg(current_asmdata.CurrAsmList,href,NR_R0);
cg.a_label(current_asmdata.CurrAsmList,l);
{ we have to go the ugly way so we can set addr_tlscall }
cg.allocallcpuregisters(current_asmdata.CurrAsmList);
cg.a_call_name(current_asmdata.CurrAsmList,gvs.mangledname,false);
with taicpu(current_asmdata.CurrAsmList.Last) do
begin
if opcode<>A_BL then
Internalerror(2019092902);
oper[0]^.ref^.refaddr:=addr_tlscall;
end;
cg.deallocallcpuregisters(current_asmdata.CurrAsmList);
cg.getcpuregister(current_asmdata.CurrAsmList,NR_R0);
cg.ungetcpuregister(current_asmdata.CurrAsmList,NR_R0);
hregister:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_load_reg_reg(current_asmdata.CurrAsmList,OS_ADDR,OS_ADDR,NR_R0,hregister);
reference_reset(location.reference,location.reference.alignment,location.reference.volatility);
location.reference.base:=current_procinfo.tlsoffset;
include(current_procinfo.flags,pi_needs_tls);
location.reference.index:=hregister;
{$endif use_tls_dialect_gnu}
handled:=true;
end;
tlsm_initial_exec:
begin
current_asmdata.getjumplabel(l);
reference_reset_symbol(href,current_asmdata.RefAsmSymbol(gvs.mangledname,AT_TLS),-8,sizeof(AInt),[]);
href.refaddr:=addr_tpoff;
href.relsymbol:=l;
hregister:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_loadaddr_ref_reg(current_asmdata.CurrAsmList,href,hregister);
cg.a_label(current_asmdata.CurrAsmList,l);
reference_reset(href,0,[]);
href.base:=NR_PC;
href.index:=hregister;
hregister:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_load_ref_reg(current_asmdata.CurrAsmList,OS_ADDR,OS_ADDR,href,hregister);
location.reference.base:=current_procinfo.tlsoffset;
include(current_procinfo.flags,pi_needs_tls);
location.reference.index:=hregister;
handled:=true;
end;
tlsm_local_exec:
begin
reference_reset_symbol(href,current_asmdata.RefAsmSymbol(gvs.mangledname,AT_TLS),0,sizeof(AInt),[]);
href.refaddr:=addr_tpoff;
hregister:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_loadaddr_ref_reg(current_asmdata.CurrAsmList,href,hregister);
reference_reset(href,0,[]);
location.reference.base:=current_procinfo.tlsoffset;
include(current_procinfo.flags,pi_needs_tls);
location.reference.index:=hregister;
handled:=true;
end;
else
Internalerror(2019092806);
end;
end;
end;
if not handled then
inherited;
end;
begin
cloadnode:=tarmloadnode;
end.
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