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{
Copyright (c) 1998-2006 by the Free Pascal development team
This unit implements an asmoutput class for m68k GAS syntax
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 ag68kgas;
{$i fpcdefs.inc}
interface
uses
cclasses,cpubase,systems,
globals,globtype,
aasmbase,aasmtai,aasmdata,aasmcpu,assemble,aggas;
type
Tm68kGNUAssembler=class(TGNUassembler)
constructor create(info: pasminfo; smart: boolean); override;
function MakeCmdLine : TCmdStr; override;
end;
type
Tm68kInstrWriter=class(TCPUInstrWriter)
procedure WriteInstruction(hp: tai);override;
end;
const
gas_opsize2str : array[topsize] of string[2] =
('','.b','.w','.l','.s','.d','.x','');
implementation
uses
cutils,
cgbase,cgutils,cpuinfo,
verbose,itcpugas;
{****************************************************************************}
{ GNU m68k Assembler writer }
{****************************************************************************}
constructor Tm68kGNUAssembler.create(info: pasminfo; smart: boolean);
begin
inherited;
InstrWriter := Tm68kInstrWriter.create(self);
end;
function Tm68kGNUAssembler.MakeCmdLine: TCmdStr;
begin
result:=inherited MakeCmdLine;
// Use old -m option for Amiga system
if target_info.system=system_m68k_amiga then
Replace(result,'$ARCH','-m'+GasCpuTypeStr[current_settings.cputype])
else
Replace(result,'$ARCH','-march='+GasCpuTypeStr[current_settings.cputype]);
end;
function getreferencestring(var ref : treference) : string;
var
s,basestr,indexstr : string;
begin
s:='';
with ref do
begin
basestr:=gas_regname(base);
indexstr:=gas_regname(index);
if assigned(symbol) then
s:=s+symbol.name;
if offset<0 then s:=s+tostr(offset)
else if (offset>0) then
begin
if (symbol=nil) then s:=tostr(offset)
else s:=s+'+'+tostr(offset);
end
else if (index=NR_NO) and (base=NR_NO) and not assigned(symbol) then
s:=s+'0';
if (index<>NR_NO) and (base=NR_NO) and (direction=dir_none) then
begin
if (scalefactor = 1) or (scalefactor = 0) then
s:=s+'('+indexstr+'.l)'
else
s:=s+'('+indexstr+'.l*'+tostr(scalefactor)+')'
end
else if (index=NR_NO) and (base<>NR_NO) and (direction=dir_inc) then
begin
if (scalefactor = 1) or (scalefactor = 0) then
s:=s+'('+basestr+')+'
else
InternalError(10002);
end
else if (index=NR_NO) and (base<>NR_NO) and (direction=dir_dec) then
begin
if (scalefactor = 1) or (scalefactor = 0) then
s:=s+'-('+basestr+')'
else
InternalError(10003);
end
else if (index=NR_NO) and (base<>NR_NO) and (direction=dir_none) then
begin
s:=s+'('+basestr+')'
end
else if (index<>NR_NO) and (base<>NR_NO) and (direction=dir_none) then
begin
if (scalefactor = 1) or (scalefactor = 0) then
s:=s+'('+basestr+','+indexstr+'.l)'
else
s:=s+'('+basestr+','+indexstr+'.l*'+tostr(scalefactor)+')';
end;
end;
getreferencestring:=s;
end;
function getopstr(var o:toper) : string;
var
i : tsuperregister;
begin
case o.typ of
top_reg:
getopstr:=gas_regname(o.reg);
top_ref:
if o.ref^.refaddr=addr_full then
begin
if assigned(o.ref^.symbol) then
getopstr:=o.ref^.symbol.name
else
getopstr:='#';
if o.ref^.offset>0 then
getopstr:=getopstr+'+'+tostr(o.ref^.offset)
else
if o.ref^.offset<0 then
getopstr:=getopstr+tostr(o.ref^.offset)
else
if not(assigned(o.ref^.symbol)) then
getopstr:=getopstr+'0';
end
else
getopstr:=getreferencestring(o.ref^);
top_regset:
begin
getopstr:='';
for i:=RS_D0 to RS_D7 do
begin
if i in o.dataregset then
getopstr:=getopstr+gas_regname(newreg(R_INTREGISTER,i,R_SUBWHOLE))+'/';
end;
for i:=RS_A0 to RS_SP do
begin
if i in o.addrregset then
getopstr:=getopstr+gas_regname(newreg(R_ADDRESSREGISTER,i,R_SUBWHOLE))+'/';
end;
for i:=RS_FP0 to RS_FP7 do
begin
if i in o.fpuregset then
getopstr:=getopstr+gas_regname(newreg(R_FPUREGISTER,i,R_SUBNONE))+'/';
end;
delete(getopstr,length(getopstr),1);
end;
top_const:
getopstr:='#'+tostr(longint(o.val));
top_realconst:
begin
str(o.val_real,getopstr);
if getopstr[1]=' ' then
getopstr[1]:='+';
getopstr:='#0d'+getopstr;
end;
else internalerror(200405021);
end;
end;
function getopstr_jmp(var o:toper) : string;
begin
case o.typ of
top_reg:
getopstr_jmp:=gas_regname(o.reg);
top_ref:
if o.ref^.refaddr=addr_no then
getopstr_jmp:=getreferencestring(o.ref^)
else
begin
if assigned(o.ref^.symbol) then
getopstr_jmp:=o.ref^.symbol.name
else
getopstr_jmp:='';
if o.ref^.offset>0 then
getopstr_jmp:=getopstr_jmp+'+'+tostr(o.ref^.offset)
else
if o.ref^.offset<0 then
getopstr_jmp:=getopstr_jmp+tostr(o.ref^.offset)
else
if not(assigned(o.ref^.symbol)) then
getopstr_jmp:=getopstr_jmp+'0';
end;
top_const:
getopstr_jmp:=tostr(o.val);
else
internalerror(200405022);
end;
end;
{****************************************************************************
TM68kASMOUTPUT
****************************************************************************}
{ returns the opcode string }
function getopcodestring(hp : tai) : string;
var
op : tasmop;
begin
op:=taicpu(hp).opcode;
{ old versions of GAS don't like PEA.L and LEA.L }
if (op in [
A_LEA,A_PEA,A_ABCD,A_BCHG,A_BCLR,A_BSET,A_BTST,
A_EXG,A_NBCD,A_SBCD,A_SWAP,A_TAS,A_SCC,A_SCS,
A_SEQ,A_SGE,A_SGT,A_SHI,A_SLE,A_SLS,A_SLT,A_SMI,
A_SNE,A_SPL,A_ST,A_SVC,A_SVS,A_SF]) then
result:=gas_op2str[op]
else
{ Scc/FScc is always BYTE, DBRA/DBcc is always WORD, doesn't need opsize (KB) }
if op in [A_SXX, A_FSXX, A_DBXX, A_DBRA] then
result:=gas_op2str[op]+cond2str[taicpu(hp).condition]
else
{ fix me: a fugly hack to utilize GNU AS pseudo instructions for more optimal branching }
if op in [A_JSR] then
result:='jbsr'
else
if op in [A_JMP] then
result:='jra'
else
if op in [A_BXX] then
result:='j'+cond2str[taicpu(hp).condition]+gas_opsize2str[taicpu(hp).opsize]
else
if op in [A_FBXX] then
result:='fj'+{gas_op2str[op]+}cond2str[taicpu(hp).condition]+gas_opsize2str[taicpu(hp).opsize]
else
result:=gas_op2str[op]+gas_opsize2str[taicpu(hp).opsize];
end;
procedure Tm68kInstrWriter.WriteInstruction(hp: tai);
var
op : tasmop;
s : string;
sep : char;
i : integer;
begin
if hp.typ <> ait_instruction then exit;
op:=taicpu(hp).opcode;
{ call maybe not translated to call }
s:=#9+getopcodestring(hp);
{ process operands }
if taicpu(hp).ops<>0 then
begin
{ call and jmp need an extra handling }
{ this code is only called if jmp isn't a labeled instruction }
{ quick hack to overcome a problem with manglednames=255 chars }
if is_calljmp(op) then
begin
s:=s+#9+getopstr_jmp(taicpu(hp).oper[0]^);
{ dbcc dx,<sym> has two operands! (KB) }
if (taicpu(hp).ops>1) then
s:=s+','+getopstr_jmp(taicpu(hp).oper[1]^);
if (taicpu(hp).ops>2) then
internalerror(2006120501);
end
else
begin
for i:=0 to taicpu(hp).ops-1 do
begin
if i=0 then
sep:=#9
else
if (i=2) and
(op in [A_DIVSL,A_DIVUL,A_MULS,A_MULU,A_DIVS,A_DIVU]) then
sep:=':'
else
sep:=',';
s:=s+sep+getopstr(taicpu(hp).oper[i]^);
end;
end;
end;
owner.writer.AsmWriteLn(s);
end;
{*****************************************************************************
Initialize
*****************************************************************************}
const
as_m68k_as_info : tasminfo =
(
id : as_gas;
idtxt : 'AS';
asmbin : 'as';
asmcmd : '$ARCH -o $OBJ $EXTRAOPT $ASM';
supported_targets : [system_m68k_Amiga,system_m68k_Atari,system_m68k_Mac,system_m68k_linux,system_m68k_PalmOS,system_m68k_netbsd,system_m68k_openbsd,system_m68k_embedded];
flags : [af_needar,af_smartlink_sections];
labelprefix : '.L';
comment : '# ';
dollarsign: '$';
);
initialization
RegisterAssembler(as_m68k_as_info,Tm68kGNUAssembler);
end.
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