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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 agarmgas;
{$i fpcdefs.inc}
interface
uses
globtype,
aasmtai,aasmdata,
aggas,
cpubase;
type
TARMGNUAssembler=class(TGNUassembler)
constructor create(smart: boolean); override;
function MakeCmdLine: TCmdStr; override;
procedure WriteExtraHeader; override;
end;
TArmInstrWriter=class(TCPUInstrWriter)
procedure WriteInstruction(hp : tai);override;
end;
TArmAppleGNUAssembler=class(TAppleGNUassembler)
constructor create(smart: boolean); override;
end;
const
gas_shiftmode2str : array[tshiftmode] of string[3] = (
'','lsl','lsr','asr','ror','rrx');
implementation
uses
cutils,globals,verbose,
systems,
assemble,
cpuinfo,aasmcpu,
itcpugas,
cgbase,cgutils;
{****************************************************************************}
{ GNU Arm Assembler writer }
{****************************************************************************}
constructor TArmGNUAssembler.create(smart: boolean);
begin
inherited create(smart);
InstrWriter := TArmInstrWriter.create(self);
end;
function TArmGNUAssembler.MakeCmdLine: TCmdStr;
begin
result:=inherited MakeCmdLine;
if (current_settings.fputype = fpu_soft) then
result:='-mfpu=softvfp '+result;
if (current_settings.fputype = fpu_vfpv2) then
result:='-mfpu=vfpv2 '+result;
if (current_settings.fputype = fpu_vfpv3) then
result:='-mfpu=vfpv3 '+result;
if (current_settings.fputype = fpu_vfpv3_d16) then
result:='-mfpu=vfpv3-d16 '+result;
if current_settings.cputype = cpu_armv7m then
result:='-march=armv7m -mthumb -mthumb-interwork '+result;
if target_info.abi = abi_eabihf then
{ options based on what gcc uses on debian armhf }
result:='-mfloat-abi=hard -meabi=5 '+result;
end;
procedure TArmGNUAssembler.WriteExtraHeader;
begin
inherited WriteExtraHeader;
if current_settings.cputype in cpu_thumb2 then
AsmWriteLn(#9'.syntax unified');
end;
{****************************************************************************}
{ GNU/Apple ARM Assembler writer }
{****************************************************************************}
constructor TArmAppleGNUAssembler.create(smart: boolean);
begin
inherited create(smart);
InstrWriter := TArmInstrWriter.create(self);
end;
{****************************************************************************}
{ Helper routines for Instruction Writer }
{****************************************************************************}
function getreferencestring(var ref : treference) : string;
var
s : string;
begin
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 assigned(symbol) then
begin
if (base<>NR_NO) and not(is_pc(base)) then
internalerror(200309011);
s:=symbol.name;
if offset<0 then
s:=s+tostr(offset)
else if offset>0 then
s:=s+'+'+tostr(offset);
end
else
begin
s:='['+gas_regname(base);
if addressmode=AM_POSTINDEXED then
s:=s+']';
if index<>NR_NO then
begin
if signindex<0 then
s:=s+', -'
else
s:=s+', ';
s:=s+gas_regname(index);
if shiftmode<>SM_None then
s:=s+', '+gas_shiftmode2str[shiftmode]+' #'+tostr(shiftimm);
end
else if offset<>0 then
s:=s+', #'+tostr(offset);
case addressmode of
AM_OFFSET:
s:=s+']';
AM_PREINDEXED:
s:=s+']!';
end;
end;
end;
getreferencestring:=s;
end;
const
shiftmode2str: array[tshiftmode] of string[3] = ('','lsl','lsr','asr','ror','rrx');
function getopstr(const o:toper) : string;
var
hs : string;
first : boolean;
r : tsuperregister;
begin
case o.typ of
top_reg:
getopstr:=gas_regname(o.reg);
top_shifterop:
begin
if (o.shifterop^.rs<>NR_NO) and (o.shifterop^.shiftimm=0) then
getopstr:=shiftmode2str[o.shifterop^.shiftmode]+' '+gas_regname(o.shifterop^.rs)
else if (o.shifterop^.rs=NR_NO) then
getopstr:=shiftmode2str[o.shifterop^.shiftmode]+' #'+tostr(o.shifterop^.shiftimm)
else internalerror(200308282);
end;
top_const:
getopstr:='#'+tostr(longint(o.val));
top_regset:
begin
getopstr:='{';
first:=true;
for r:=RS_R0 to RS_R15 do
if r in o.regset^ then
begin
if not(first) then
getopstr:=getopstr+',';
getopstr:=getopstr+gas_regname(newreg(o.regtyp,r,o.subreg));
first:=false;
end;
getopstr:=getopstr+'}';
end;
top_conditioncode:
getopstr:=cond2str[o.cc];
top_modeflags:
begin
getopstr:='';
if mfA in o.modeflags then getopstr:=getopstr+'a';
if mfI in o.modeflags then getopstr:=getopstr+'i';
if mfF in o.modeflags then getopstr:=getopstr+'f';
end;
top_ref:
if o.ref^.refaddr=addr_full then
begin
hs:=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;
Procedure TArmInstrWriter.WriteInstruction(hp : tai);
var op: TAsmOp;
postfix,s: string;
i: byte;
sep: string[3];
begin
op:=taicpu(hp).opcode;
if current_settings.cputype in cpu_thumb2 then
begin
postfix:='';
if taicpu(hp).wideformat then
postfix:='.w';
if taicpu(hp).ops = 0 then
s:=#9+gas_op2str[op]+' '+cond2str[taicpu(hp).condition]+oppostfix2str[taicpu(hp).oppostfix]
else
s:=#9+gas_op2str[op]+oppostfix2str[taicpu(hp).oppostfix]+postfix+cond2str[taicpu(hp).condition]; // Conditional infixes are deprecated in unified syntax
end
else
s:=#9+gas_op2str[op]+cond2str[taicpu(hp).condition]+oppostfix2str[taicpu(hp).oppostfix];
if taicpu(hp).ops<>0 then
begin
sep:=#9;
for i:=0 to taicpu(hp).ops-1 do
begin
// debug code
// writeln(s);
// writeln(taicpu(hp).fileinfo.line);
{ LDM and STM use references as first operand but they are written like a register }
if (i=0) and (op in [A_LDM,A_STM,A_FSTM,A_FLDM]) then
begin
case taicpu(hp).oper[0]^.typ of
top_ref:
begin
s:=s+sep+gas_regname(taicpu(hp).oper[0]^.ref^.index);
if taicpu(hp).oper[0]^.ref^.addressmode=AM_PREINDEXED then
s:=s+'!';
end;
top_reg:
s:=s+sep+gas_regname(taicpu(hp).oper[0]^.reg);
else
internalerror(200311292);
end;
end
{ register count of SFM and LFM is written without # }
else if (i=1) and (op in [A_SFM,A_LFM]) then
begin
case taicpu(hp).oper[1]^.typ of
top_const:
s:=s+sep+tostr(taicpu(hp).oper[1]^.val);
else
internalerror(200311292);
end;
end
else
s:=s+sep+getopstr(taicpu(hp).oper[i]^);
sep:=',';
end;
end;
owner.AsmWriteLn(s);
end;
const
as_arm_gas_info : tasminfo =
(
id : as_gas;
idtxt : 'AS';
asmbin : 'as';
asmcmd : '-o $OBJ $ASM';
supported_targets : [system_arm_linux,system_arm_wince,system_arm_gba,system_arm_palmos,system_arm_nds,system_arm_embedded,system_arm_symbian];
flags : [af_allowdirect,af_needar,af_smartlink_sections];
labelprefix : '.L';
comment : '# ';
dollarsign: '$';
);
as_arm_gas_darwin_info : tasminfo =
(
id : as_darwin;
idtxt : 'AS-Darwin';
asmbin : 'as';
asmcmd : '-o $OBJ $ASM -arch $ARCH';
supported_targets : [system_arm_darwin];
flags : [af_allowdirect,af_needar,af_smartlink_sections,af_supports_dwarf,af_stabs_use_function_absolute_addresses];
labelprefix : 'L';
comment : '# ';
dollarsign: '$';
);
begin
RegisterAssembler(as_arm_gas_info,TARMGNUAssembler);
RegisterAssembler(as_arm_gas_darwin_info,TArmAppleGNUAssembler);
end.
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