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{
Copyright (c) 2003 by Florian Klaempfl
This unit implements an asm for the ARM
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 implements the GNU Assembler writer for the ARM
}
unit agavrgas;
{$i fpcdefs.inc}
interface
uses
globtype,systems,
aasmtai,aasmdata,
assemble,aggas,
cpubase;
type
{ TAVRGNUAssembler }
TAVRGNUAssembler=class(TGNUassembler)
constructor CreateWithWriter(info: pasminfo; wr: TExternalAssemblerOutputFile; freewriter, smart: boolean); override;
function MakeCmdLine: TCmdStr; override;
end;
TAVRInstrWriter=class(TCPUInstrWriter)
procedure WriteInstruction(hp : tai);override;
end;
implementation
uses
cutils,globals,verbose,
aasmbase,aasmcpu,
itcpugas,
cpuinfo,
cgbase,cgutils;
{****************************************************************************}
{ GNU Arm Assembler writer }
{****************************************************************************}
constructor TAVRGNUAssembler.CreateWithWriter(info: pasminfo; wr: TExternalAssemblerOutputFile; freewriter, smart: boolean);
begin
inherited;
InstrWriter := TAVRInstrWriter.create(self);
end;
{****************************************************************************}
{ Helper routines for Instruction Writer }
{****************************************************************************}
Procedure TAVRInstrWriter.WriteInstruction(hp : tai);
var
op: TAsmOp;
function getreferencestring(var ref : treference) : string;
var
s : string;
begin
s:='';
with ref do
begin
{$ifdef extdebug}
// if base=NR_NO then
// internalerror(200308292);
// if ((index<>NR_NO) or (shiftmode<>SM_None)) and ((offset<>0) or (symbol<>nil)) then
// internalerror(200308293);
{$endif extdebug}
if index<>NR_NO then
internalerror(2011021707)
else if base<>NR_NO then
begin
if addressmode=AM_PREDRECEMENT then
s:='-';
case base of
NR_R26:
s:=s+'X';
NR_R28:
s:=s+'Y';
NR_R30:
s:=s+'Z';
else
s:=s+gas_regname(base);
end;
if addressmode=AM_POSTINCREMENT then
s:=s+'+'
else if addressmode = AM_UNCHANGED then
begin
if (offset>0) or ((offset=0) and (op in [A_LDD,A_STD])) then
s:=s+'+'+tostr(offset)
else if offset<0 then
s:=s+tostr(offset);
end;
end
else if assigned(symbol) or (offset<>0) then
begin
if assigned(symbol) then
s:=ApplyAsmSymbolRestrictions(symbol.name);
if s='' then
s:=tostr(offset)
else if offset<0 then
s:=s+tostr(offset)
else if offset>0 then
s:=s+'+'+tostr(offset);
case refaddr of
addr_hi8:
s:='hi8('+s+')';
addr_hi8_gs:
s:='hi8(gs('+s+'))';
addr_lo8:
s:='lo8('+s+')';
addr_lo8_gs:
s:='lo8(gs('+s+'))';
else
s:='('+s+')';
end;
end
{ reference to address 0? }
else if not(assigned(symbol)) and (offset=0) then
s:='(0)';
end;
getreferencestring:=s;
end;
function getopstr(const o:toper) : string;
var
hs : string;
begin
case o.typ of
top_reg:
getopstr:=gas_regname(o.reg);
top_const:
getopstr:=tostr(longint(o.val));
top_ref:
if o.ref^.refaddr=addr_full then
begin
hs:=ApplyAsmSymbolRestrictions(o.ref^.symbol.name);
if o.ref^.offset>0 then
hs:=hs+'+'+tostr(o.ref^.offset)
else if o.ref^.offset<0 then
hs:=hs+tostr(o.ref^.offset);
getopstr:=hs;
end
else
getopstr:=getreferencestring(o.ref^);
else
internalerror(2002070604);
end;
end;
var
s: string;
i: byte;
sep: string[3];
begin
op:=taicpu(hp).opcode;
s:=#9+gas_op2str[op]+cond2str[taicpu(hp).condition];
if taicpu(hp).ops<>0 then
begin
sep:=#9;
for i:=0 to taicpu(hp).ops-1 do
begin
s:=s+sep+getopstr(taicpu(hp).oper[i]^);
sep:=',';
end;
end;
owner.writer.AsmWriteLn(s);
end;
function TAVRGNUAssembler.MakeCmdLine: TCmdStr;
begin
result := '-mmcu='+lower(cputypestr[current_settings.cputype])+' '+inherited MakeCmdLine;
end;
const
as_avr_gas_info : tasminfo =
(
id : as_gas;
idtxt : 'AS';
asmbin : 'as';
asmcmd : '-o $OBJ $EXTRAOPT $ASM';
supported_targets : [system_avr_embedded];
flags : [af_needar,af_smartlink_sections];
labelprefix : '.L';
labelmaxlen : -1;
comment : '# ';
dollarsign: 's';
);
begin
RegisterAssembler(as_avr_gas_info,TAVRGNUAssembler);
end.
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