{
Copyright (c) 1998-2002 by Carl Eric Codere and Peter Vreman
Does the parsing for the PowerPC GNU AS styled inline assembler.
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 rappcgas;
{$i fpcdefs.inc}
Interface
uses
raatt,rappc;
type
tppcattreader = class(tattreader)
function is_asmopcode(const s: string):boolean;override;
procedure handleopcode;override;
procedure BuildReference(oper : tppcoperand);
procedure BuildOperand(oper : tppcoperand);
procedure BuildOpCode(instr : tppcinstruction);
procedure ReadAt(oper : tppcoperand);
procedure ReadSym(oper : tppcoperand);
procedure ConvertCalljmp(instr : tppcinstruction);
end;
Implementation
uses
{ helpers }
cutils,
{ global }
globtype,verbose,
systems,
{ aasm }
cpubase,aasmbase,aasmtai,aasmdata,aasmcpu,
{ symtable }
symconst,symsym,
{ parser }
procinfo,
rabase,rautils,
cgbase,cgobj
;
procedure tppcattreader.ReadSym(oper : tppcoperand);
var
tempstr, mangledname : string;
typesize,l,k : aint;
begin
tempstr:=actasmpattern;
Consume(AS_ID);
{ typecasting? }
if (actasmtoken=AS_LPAREN) and
SearchType(tempstr,typesize) then
begin
oper.hastype:=true;
Consume(AS_LPAREN);
BuildOperand(oper);
Consume(AS_RPAREN);
if oper.opr.typ in [OPR_REFERENCE,OPR_LOCAL] then
oper.SetSize(typesize,true);
end
else
if not oper.SetupVar(tempstr,false) then
Message1(sym_e_unknown_id,tempstr);
{ record.field ? }
if actasmtoken=AS_DOT then
begin
BuildRecordOffsetSize(tempstr,l,k,mangledname,false);
if (mangledname<>'') then
Message(asmr_e_invalid_reference_syntax);
inc(oper.opr.ref.offset,l);
end;
end;
procedure tppcattreader.ReadAt(oper : tppcoperand);
begin
{ check for ...@ }
if actasmtoken=AS_AT then
begin
if (oper.opr.ref.symbol=nil) and
(oper.opr.ref.offset = 0) then
Message(asmr_e_invalid_reference_syntax);
Consume(AS_AT);
if actasmtoken=AS_ID then
begin
if upper(actasmpattern)='L' then
oper.opr.ref.refaddr:=addr_lo
else if upper(actasmpattern)='HA' then
oper.opr.ref.refaddr:=addr_hi
else
Message(asmr_e_invalid_reference_syntax);
Consume(AS_ID);
end
else
Message(asmr_e_invalid_reference_syntax);
end;
end;
Procedure tppcattreader.BuildReference(oper : tppcoperand);
procedure Consume_RParen;
begin
if actasmtoken <> AS_RPAREN then
Begin
Message(asmr_e_invalid_reference_syntax);
RecoverConsume(true);
end
else
begin
Consume(AS_RPAREN);
if not (actasmtoken in [AS_COMMA,AS_SEPARATOR,AS_END]) then
Begin
Message(asmr_e_invalid_reference_syntax);
RecoverConsume(true);
end;
end;
end;
var
l : aint;
begin
Consume(AS_LPAREN);
Case actasmtoken of
AS_INTNUM,
AS_MINUS,
AS_PLUS:
Begin
{ offset(offset) is invalid }
If oper.opr.Ref.Offset <> 0 Then
Begin
Message(asmr_e_invalid_reference_syntax);
RecoverConsume(true);
End
Else
Begin
oper.opr.Ref.Offset:=BuildConstExpression(false,true);
Consume(AS_RPAREN);
if actasmtoken=AS_AT then
ReadAt(oper);
end;
exit;
End;
AS_REGISTER: { (reg ... }
Begin
if ((oper.opr.typ=OPR_REFERENCE) and (oper.opr.ref.base<>NR_NO)) or
((oper.opr.typ=OPR_LOCAL) and (oper.opr.localsym.localloc.loc<>LOC_REGISTER)) then
message(asmr_e_cannot_index_relative_var);
oper.opr.ref.base:=actasmregister;
Consume(AS_REGISTER);
{ can either be a register or a right parenthesis }
{ (reg) }
if actasmtoken=AS_RPAREN then
Begin
Consume_RParen;
exit;
end;
{ (reg,reg .. }
Consume(AS_COMMA);
if (actasmtoken=AS_REGISTER) and
(oper.opr.Ref.Offset = 0) then
Begin
oper.opr.ref.index:=actasmregister;
Consume(AS_REGISTER);
Consume_RParen;
end
else
Begin
Message(asmr_e_invalid_reference_syntax);
RecoverConsume(false);
end;
end; {end case }
AS_ID:
Begin
ReadSym(oper);
{ add a constant expression? }
if (actasmtoken=AS_PLUS) then
begin
l:=BuildConstExpression(true,true);
case oper.opr.typ of
OPR_CONSTANT :
inc(oper.opr.val,l);
OPR_LOCAL :
inc(oper.opr.localsymofs,l);
OPR_REFERENCE :
inc(oper.opr.ref.offset,l);
else
internalerror(200309202);
end;
end;
Consume(AS_RPAREN);
if actasmtoken=AS_AT then
ReadAt(oper);
End;
AS_COMMA: { (, ... can either be scaling, or index }
Begin
Consume(AS_COMMA);
{ Index }
if (actasmtoken=AS_REGISTER) then
Begin
oper.opr.ref.index:=actasmregister;
Consume(AS_REGISTER);
{ check for scaling ... }
Consume_RParen;
end
else
begin
Message(asmr_e_invalid_reference_syntax);
RecoverConsume(false);
end;
end;
else
Begin
Message(asmr_e_invalid_reference_syntax);
RecoverConsume(false);
end;
end;
end;
Procedure tppcattreader.BuildOperand(oper : tppcoperand);
var
expr : string;
typesize,l : aint;
procedure AddLabelOperand(hl:tasmlabel);
begin
if not(actasmtoken in [AS_PLUS,AS_MINUS,AS_LPAREN]) and
is_calljmp(actopcode) then
begin
oper.opr.typ:=OPR_SYMBOL;
oper.opr.symbol:=hl;
end
else
begin
oper.InitRef;
oper.opr.ref.symbol:=hl;
end;
end;
procedure MaybeRecordOffset;
var
mangledname: string;
hasdot : boolean;
l,
toffset,
tsize : aint;
begin
if not(actasmtoken in [AS_DOT,AS_PLUS,AS_MINUS]) then
exit;
l:=0;
hasdot:=(actasmtoken=AS_DOT);
if hasdot then
begin
if expr<>'' then
begin
BuildRecordOffsetSize(expr,toffset,tsize,mangledname,false);
if (oper.opr.typ<>OPR_CONSTANT) and
(mangledname<>'') then
Message(asmr_e_wrong_sym_type);
inc(l,toffset);
oper.SetSize(tsize,true);
end;
end;
if actasmtoken in [AS_PLUS,AS_MINUS] then
inc(l,BuildConstExpression(true,false));
case oper.opr.typ of
OPR_LOCAL :
begin
{ don't allow direct access to fields of parameters, because that
will generate buggy code. Allow it only for explicit typecasting }
if hasdot and
(not oper.hastype) and
(tabstractvarsym(oper.opr.localsym).owner.symtabletype=parasymtable) and
(current_procinfo.procdef.proccalloption<>pocall_register) then
Message(asmr_e_cannot_access_field_directly_for_parameters);
inc(oper.opr.localsymofs,l)
end;
OPR_CONSTANT :
if (mangledname<>'') then
begin
if (oper.opr.val<>0) then
Message(asmr_e_wrong_sym_type);
oper.opr.typ:=OPR_SYMBOL;
oper.opr.symbol:=current_asmdata.RefAsmSymbol(mangledname);
end
else
inc(oper.opr.val,l);
OPR_REFERENCE :
inc(oper.opr.ref.offset,l);
OPR_SYMBOL:
Message(asmr_e_invalid_symbol_ref);
else
internalerror(200309221);
end;
end;
function MaybeBuildReference:boolean;
{ Try to create a reference, if not a reference is found then false
is returned }
begin
MaybeBuildReference:=true;
case actasmtoken of
AS_INTNUM,
AS_MINUS,
AS_PLUS:
Begin
oper.opr.ref.offset:=BuildConstExpression(True,False);
if actasmtoken<>AS_LPAREN then
Message(asmr_e_invalid_reference_syntax)
else
BuildReference(oper);
end;
AS_LPAREN:
BuildReference(oper);
AS_ID: { only a variable is allowed ... }
Begin
ReadSym(oper);
case actasmtoken of
AS_END,
AS_SEPARATOR,
AS_COMMA: ;
AS_LPAREN:
BuildReference(oper);
else
Begin
Message(asmr_e_invalid_reference_syntax);
Consume(actasmtoken);
end;
end; {end case }
end;
else
MaybeBuildReference:=false;
end; { end case }
end;
var
tempreg : tregister;
hl : tasmlabel;
ofs : aint;
Begin
expr:='';
case actasmtoken of
AS_LPAREN: { Memory reference or constant expression }
Begin
oper.InitRef;
BuildReference(oper);
end;
AS_INTNUM,
AS_MINUS,
AS_PLUS:
Begin
{ Constant memory offset }
{ This must absolutely be followed by ( }
oper.InitRef;
oper.opr.ref.offset:=BuildConstExpression(True,False);
if actasmtoken<>AS_LPAREN then
begin
ofs:=oper.opr.ref.offset;
BuildConstantOperand(oper);
inc(oper.opr.val,ofs);
end
else
BuildReference(oper);
end;
AS_ID: { A constant expression, or a Variable ref. }
Begin
{ Local Label ? }
if is_locallabel(actasmpattern) then
begin
CreateLocalLabel(actasmpattern,hl,false);
Consume(AS_ID);
AddLabelOperand(hl);
end
else
{ Check for label }
if SearchLabel(actasmpattern,hl,false) then
begin
Consume(AS_ID);
AddLabelOperand(hl);
end
else
{ probably a variable or normal expression }
{ or a procedure (such as in CALL ID) }
Begin
{ is it a constant ? }
if SearchIConstant(actasmpattern,l) then
Begin
if not (oper.opr.typ in [OPR_NONE,OPR_CONSTANT]) then
Message(asmr_e_invalid_operand_type);
BuildConstantOperand(oper);
end
else
begin
expr:=actasmpattern;
Consume(AS_ID);
{ typecasting? }
if (actasmtoken=AS_LPAREN) and
SearchType(expr,typesize) then
begin
oper.hastype:=true;
Consume(AS_LPAREN);
BuildOperand(oper);
Consume(AS_RPAREN);
if oper.opr.typ in [OPR_REFERENCE,OPR_LOCAL] then
oper.SetSize(typesize,true);
end
else
begin
if oper.SetupVar(expr,false) then
ReadAt(oper)
else
Begin
{ look for special symbols ... }
if expr= '__HIGH' then
begin
consume(AS_LPAREN);
if not oper.setupvar('high'+actasmpattern,false) then
Message1(sym_e_unknown_id,'high'+actasmpattern);
consume(AS_ID);
consume(AS_RPAREN);
end
else
if expr = '__RESULT' then
oper.SetUpResult
else
if expr = '__SELF' then
oper.SetupSelf
else
if expr = '__OLDEBP' then
oper.SetupOldEBP
else
Message1(sym_e_unknown_id,expr);
end;
end;
end;
if actasmtoken=AS_DOT then
MaybeRecordOffset;
{ add a constant expression? }
if (actasmtoken=AS_PLUS) then
begin
l:=BuildConstExpression(true,false);
case oper.opr.typ of
OPR_CONSTANT :
inc(oper.opr.val,l);
OPR_LOCAL :
inc(oper.opr.localsymofs,l);
OPR_REFERENCE :
inc(oper.opr.ref.offset,l);
else
internalerror(200309202);
end;
end
end;
{ Do we have a indexing reference, then parse it also }
if actasmtoken=AS_LPAREN then
BuildReference(oper);
end;
AS_REGISTER: { Register, a variable reference or a constant reference }
Begin
{ save the type of register used. }
tempreg:=actasmregister;
Consume(AS_REGISTER);
if (actasmtoken in [AS_END,AS_SEPARATOR,AS_COMMA]) then
if is_condreg(tempreg) and
((actopcode = A_BC) or
(actopcode = A_BCCTR) or
(actopcode = A_BCLR) or
(actopcode = A_TW) or
(actopcode = A_TWI)) then
begin
{ it isn't a real operand, everything is stored in the condition }
oper.opr.typ:=OPR_NONE;
actcondition.cr := getsupreg(tempreg);
end
else
begin
if not (oper.opr.typ in [OPR_NONE,OPR_REGISTER]) then
Message(asmr_e_invalid_operand_type);
oper.opr.typ:=OPR_REGISTER;
oper.opr.reg:=tempreg;
end
else if is_condreg(tempreg) then
begin
if not(actcondition.cond in [C_T..C_DZF]) then
Message(asmr_e_syn_operand);
if actasmtoken=AS_STAR then
begin
consume(AS_STAR);
if (actasmtoken=AS_INTNUM) then
begin
consume(AS_INTNUM);
if actasmtoken=AS_PLUS then
begin
consume(AS_PLUS);
if (actasmtoken=AS_ID) then
begin
oper.opr.typ:=OPR_NONE;
if actasmpattern='LT' then
actcondition.crbit:=(getsupreg(tempreg)-(RS_CR0))*4
else if actasmpattern='GT' then
actcondition.crbit:=(getsupreg(tempreg)-(RS_CR0))*4+1
else if actasmpattern='EQ' then
actcondition.crbit:=(getsupreg(tempreg)-(RS_CR0))*4+2
else if actasmpattern='SO' then
actcondition.crbit:=(getsupreg(tempreg)-(RS_CR0))*4+3
else
Message(asmr_e_syn_operand);
consume(AS_ID);
end
else
Message(asmr_e_syn_operand);
end
else
Message(asmr_e_syn_operand);
end
else
Message(asmr_e_syn_operand);
end
else
Message(asmr_e_syn_operand);
end
else
Message(asmr_e_syn_operand);
end;
AS_END,
AS_SEPARATOR,
AS_COMMA: ;
else
Begin
Message(asmr_e_syn_operand);
Consume(actasmtoken);
end;
end; { end case }
end;
{*****************************************************************************
tppcattreader
*****************************************************************************}
procedure tppcattreader.BuildOpCode(instr : tppcinstruction);
var
operandnum : longint;
Begin
{ opcode }
if (actasmtoken<>AS_OPCODE) then
Begin
Message(asmr_e_invalid_or_missing_opcode);
RecoverConsume(true);
exit;
end;
{ Fill the instr object with the current state }
with instr do
begin
Opcode:=ActOpcode;
condition:=ActCondition;
end;
{ We are reading operands, so opcode will be an AS_ID }
operandnum:=1;
Consume(AS_OPCODE);
{ Zero operand opcode ? }
if actasmtoken in [AS_SEPARATOR,AS_END] then
begin
operandnum:=0;
exit;
end;
{ Read the operands }
repeat
case actasmtoken of
AS_COMMA: { Operand delimiter }
Begin
if operandnum>Max_Operands then
Message(asmr_e_too_many_operands)
else
begin
{ condition operands doesn't set the operand but write to the
condition field of the instruction
}
if instr.Operands[operandnum].opr.typ<>OPR_NONE then
Inc(operandnum);
end;
Consume(AS_COMMA);
end;
AS_SEPARATOR,
AS_END : { End of asm operands for this opcode }
begin
break;
end;
else
BuildOperand(instr.Operands[operandnum] as tppcoperand);
end; { end case }
until false;
if (operandnum=1) and (instr.Operands[operandnum].opr.typ=OPR_NONE) then
dec(operandnum);
instr.Ops:=operandnum;
end;
function tppcattreader.is_asmopcode(const s: string):boolean;
var
cond : tasmcondflag;
hs : string;
Begin
{ making s a value parameter would break other assembler readers }
hs:=s;
is_asmopcode:=false;
{ clear op code }
actopcode:=A_None;
{ clear condition }
fillchar(actcondition,sizeof(actcondition),0);
{ check for direction hint }
if hs[length(s)]='-' then
begin
dec(ord(hs[0]));
actcondition.dirhint:=DH_Minus;
end
else if hs[length(s)]='+' then
begin
dec(ord(hs[0]));
actcondition.dirhint:=DH_Plus;
end;
actopcode := tasmop(ptrint(iasmops.find(hs)));
if actopcode <> A_NONE then
begin
if actcondition.dirhint<>DH_None then
message1(asmr_e_unknown_opcode,actasmpattern);
actasmtoken:=AS_OPCODE;
is_asmopcode:=true;
exit;
end;
{ not found, check branch instructions }
if hs[1]='B' then
begin
{ we can search here without an extra table which is sorted by string length
because we take the whole remaining string without the leading B }
if copy(hs,length(s)-1,2)='LR' then
begin
actopcode := A_BCLR;
setlength(hs,length(hs)-2)
end
else if copy(hs,length(s)-2,3)='CTR' then
begin
actopcode := A_BCCTR;
setlength(hs,length(hs)-3)
end
else
actopcode := A_BC;
for cond:=low(TAsmCondFlag) to high(TAsmCondFlag) do
if copy(hs,2,length(s)-1)=UpperAsmCondFlag2Str[cond] then
begin
actcondition.simple:=true;
actcondition.cond:=cond;
if (cond in [C_LT,C_LE,C_EQ,C_GE,C_GT,C_NL,C_NE,C_NG,C_SO,C_NS,C_UN,C_NU]) then
actcondition.cr := RS_CR0;
actasmtoken:=AS_OPCODE;
is_asmopcode:=true;
exit;
end;
end;
end;
procedure tppcattreader.ConvertCalljmp(instr : tppcinstruction);
begin
if instr.Operands[1].opr.typ = OPR_CONSTANT then
begin
if (instr.operands[1].opr.val > 31) or
(instr.operands[2].opr.typ <> OPR_CONSTANT) or
(instr.operands[2].opr.val > 31) or
not(instr.operands[3].opr.typ in [OPR_REFERENCE,OPR_SYMBOL]) then
Message(asmr_e_syn_operand);
{ BO/BI notation }
instr.condition.simple := false;
instr.condition.bo := instr.operands[1].opr.val;
instr.condition.bi := instr.operands[2].opr.val;
instr.operands[1].free;
instr.operands[2].free;
instr.operands[2] := nil;
instr.operands[1] := instr.operands[3];
instr.operands[3] := nil;
instr.ops := 1;
end;
if instr.Operands[1].opr.typ = OPR_REFERENCE then
begin
instr.Operands[1].opr.ref.refaddr:=addr_full;
if (instr.Operands[1].opr.ref.base<>NR_NO) or
(instr.Operands[1].opr.ref.index<>NR_NO) then
Message(asmr_e_syn_operand);
end;
end;
procedure tppcattreader.handleopcode;
var
instr : tppcinstruction;
begin
instr:=TPPCInstruction.Create(TPPCOperand);
BuildOpcode(instr);
instr.condition := actcondition;
if is_calljmp(instr.opcode) then
ConvertCalljmp(instr);
{
instr.AddReferenceSizes;
instr.SetInstructionOpsize;
instr.CheckOperandSizes;
}
instr.ConcatInstruction(curlist);
instr.Free;
end;
{*****************************************************************************
Initialize
*****************************************************************************}
const
asmmode_ppc_att_info : tasmmodeinfo =
(
id : asmmode_ppc_gas;
idtxt : 'GAS';
casmreader : tppcattreader;
);
asmmode_ppc_standard_info : tasmmodeinfo =
(
id : asmmode_standard;
idtxt : 'STANDARD';
casmreader : tppcattreader;
);
initialization
RegisterAsmMode(asmmode_ppc_att_info);
RegisterAsmMode(asmmode_ppc_standard_info);
end.
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