{
Copyright (c) 1998-2002 by Carl Eric Codere and Peter Vreman
Does the parsing for the ARM 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 raarmgas;
{$i fpcdefs.inc}
Interface
uses
raatt,raarm,
cpubase;
type
tarmattreader = class(tattreader)
actoppostfix : TOpPostfix;
function is_asmopcode(const s: string):boolean;override;
function is_register(const s:string):boolean;override;
procedure handleopcode;override;
procedure BuildReference(oper : tarmoperand);
procedure BuildOperand(oper : tarmoperand);
function TryBuildShifterOp(oper : tarmoperand) : boolean;
procedure BuildOpCode(instr : tarminstruction);
procedure ReadSym(oper : tarmoperand);
procedure ConvertCalljmp(instr : tarminstruction);
end;
Implementation
uses
{ helpers }
cutils,
{ global }
globtype,globals,verbose,
systems,
{ aasm }
cpuinfo,aasmbase,aasmtai,aasmdata,aasmcpu,
{ symtable }
symconst,symbase,symtype,symsym,symtable,
{ parser }
scanner,
procinfo,
itcpugas,
rabase,rautils,
cgbase,cgobj
;
function tarmattreader.is_register(const s:string):boolean;
type
treg2str = record
name : string[2];
reg : tregister;
end;
const
extraregs : array[0..19] of treg2str = (
(name: 'A1'; reg : NR_R0),
(name: 'A2'; reg : NR_R1),
(name: 'A3'; reg : NR_R2),
(name: 'A4'; reg : NR_R3),
(name: 'V1'; reg : NR_R4),
(name: 'V2'; reg : NR_R5),
(name: 'V3'; reg : NR_R6),
(name: 'V4'; reg : NR_R7),
(name: 'V5'; reg : NR_R8),
(name: 'V6'; reg : NR_R9),
(name: 'V7'; reg : NR_R10),
(name: 'V8'; reg : NR_R11),
(name: 'WR'; reg : NR_R7),
(name: 'SB'; reg : NR_R9),
(name: 'SL'; reg : NR_R10),
(name: 'FP'; reg : NR_R11),
(name: 'IP'; reg : NR_R12),
(name: 'SP'; reg : NR_R13),
(name: 'LR'; reg : NR_R14),
(name: 'PC'; reg : NR_R15));
var
i : longint;
begin
result:=inherited is_register(s);
{ reg found?
possible aliases are always 2 char
}
if result or (length(s)<>2) then
exit;
for i:=low(extraregs) to high(extraregs) do
begin
if s=extraregs[i].name then
begin
actasmregister:=extraregs[i].reg;
result:=true;
actasmtoken:=AS_REGISTER;
exit;
end;
end;
end;
procedure tarmattreader.ReadSym(oper : tarmoperand);
var
tempstr, mangledname : string;
typesize,l,k : longint;
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 tarmattreader.BuildReference(oper : tarmoperand);
procedure Consume_RBracket;
begin
if actasmtoken<>AS_RBRACKET then
Begin
Message(asmr_e_invalid_reference_syntax);
RecoverConsume(true);
end
else
begin
Consume(AS_RBRACKET);
if not (actasmtoken in [AS_COMMA,AS_SEPARATOR,AS_END]) then
Begin
Message(asmr_e_invalid_reference_syntax);
RecoverConsume(true);
end;
end;
end;
procedure read_index;
begin
Consume(AS_COMMA);
if actasmtoken=AS_REGISTER then
Begin
oper.opr.ref.index:=actasmregister;
Consume(AS_REGISTER);
end
else if actasmtoken=AS_HASH then
begin
Consume(AS_HASH);
inc(oper.opr.ref.offset,BuildConstExpression(false,true));
end;
end;
begin
Consume(AS_LBRACKET);
if actasmtoken=AS_REGISTER then
begin
oper.opr.ref.base:=actasmregister;
Consume(AS_REGISTER);
{ can either be a register or a right parenthesis }
{ (reg) }
if actasmtoken=AS_RBRACKET then
Begin
Consume_RBracket;
oper.opr.ref.addressmode:=AM_POSTINDEXED;
if actasmtoken=AS_COMMA then
read_index;
exit;
end;
if actasmtoken=AS_COMMA then
begin
read_index;
Consume_RBracket;
end;
if actasmtoken=AS_NOT then
begin
consume(AS_NOT);
oper.opr.ref.addressmode:=AM_PREINDEXED;
end;
end {end case }
else
Begin
Message(asmr_e_invalid_reference_syntax);
RecoverConsume(false);
end;
end;
function tarmattreader.TryBuildShifterOp(oper : tarmoperand) : boolean;
procedure handlepara(sm : tshiftmode);
begin
consume(AS_ID);
fillchar(oper.opr,sizeof(oper.opr),0);
oper.opr.typ:=OPR_SHIFTEROP;
oper.opr.shifterop.shiftmode:=sm;
if sm<>SM_RRX then
begin
case actasmtoken of
AS_REGISTER:
begin
oper.opr.shifterop.rs:=actasmregister;
consume(AS_REGISTER);
end;
AS_HASH:
begin
consume(AS_HASH);
oper.opr.shifterop.shiftimm:=BuildConstExpression(false,false);
end;
else
Message(asmr_e_illegal_shifterop_syntax);
end;
end;
end;
begin
result:=true;
if (actasmtoken=AS_ID) then
begin
if (actasmpattern='LSL') then
handlepara(SM_LSL)
else if (actasmpattern='LSR') then
handlepara(SM_LSR)
else if (actasmpattern='ASR') then
handlepara(SM_ASR)
else if (actasmpattern='ROR') then
handlepara(SM_ROR)
else if (actasmpattern='RRX') then
handlepara(SM_ROR)
else
result:=false;
end
else
result:=false;
end;
Procedure tarmattreader.BuildOperand(oper : tarmoperand);
var
expr : string;
typesize,l : longint;
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 : longint;
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
(tabstractnormalvarsym(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 :
inc(oper.opr.val,l);
OPR_REFERENCE :
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_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;
ireg : tsuperregister;
hl : tasmlabel;
ofs : longint;
registerset : tcpuregisterset;
Begin
expr:='';
case actasmtoken of
AS_LBRACKET: { Memory reference or constant expression }
Begin
oper.InitRef;
BuildReference(oper);
end;
AS_HASH: { Constant expression }
Begin
Consume(AS_HASH);
BuildConstantOperand(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 not(oper.SetupVar(expr,false)) then
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;
{ Register, a variable reference or a constant reference }
AS_REGISTER:
Begin
{ save the type of register used. }
tempreg:=actasmregister;
Consume(AS_REGISTER);
if (actasmtoken in [AS_END,AS_SEPARATOR,AS_COMMA]) then
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 (actasmtoken=AS_NOT) and (actopcode in [A_LDM,A_STM]) then
begin
consume(AS_NOT);
oper.opr.typ:=OPR_REFERENCE;
oper.opr.ref.addressmode:=AM_PREINDEXED;
oper.opr.ref.index:=tempreg;
end
else
Message(asmr_e_syn_operand);
end;
{ Registerset }
AS_LSBRACKET:
begin
consume(AS_LSBRACKET);
registerset:=[];
while true do
begin
if actasmtoken=AS_REGISTER then
begin
include(registerset,getsupreg(actasmregister));
tempreg:=actasmregister;
consume(AS_REGISTER);
if actasmtoken=AS_MINUS then
begin
consume(AS_MINUS);
for ireg:=getsupreg(tempreg) to getsupreg(actasmregister) do
include(registerset,ireg);
consume(AS_REGISTER);
end;
end
else
consume(AS_REGISTER);
if actasmtoken=AS_COMMA then
consume(AS_COMMA)
else
break;
end;
consume(AS_RSBRACKET);
oper.opr.typ:=OPR_REGSET;
oper.opr.regset:=registerset;
end;
AS_END,
AS_SEPARATOR,
AS_COMMA: ;
else
Begin
Message(asmr_e_syn_operand);
Consume(actasmtoken);
end;
end; { end case }
end;
{*****************************************************************************
tarmattreader
*****************************************************************************}
procedure tarmattreader.BuildOpCode(instr : tarminstruction);
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;
oppostfix:=actoppostfix;
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 ((instr.opcode=A_MOV) and (operandnum=2)) or
((operandnum=3) and not(instr.opcode in [A_UMLAL,A_UMULL,A_SMLAL,A_SMULL])) then
begin
Consume(AS_COMMA);
if not(TryBuildShifterOp(instr.Operands[operandnum+1] as tarmoperand)) then
Message(asmr_e_illegal_shifterop_syntax);
Inc(operandnum);
end
else
begin
if operandnum>Max_Operands then
Message(asmr_e_too_many_operands)
else
Inc(operandnum);
Consume(AS_COMMA);
end;
end;
AS_SEPARATOR,
AS_END : { End of asm operands for this opcode }
begin
break;
end;
else
BuildOperand(instr.Operands[operandnum] as tarmoperand);
end; { end case }
until false;
instr.Ops:=operandnum;
end;
function tarmattreader.is_asmopcode(const s: string):boolean;
const
{ sorted by length so longer postfixes will match first }
postfix2strsorted : array[1..19] of string[2] = (
'EP','SB','BT','SH',
'IA','IB','DA','DB','FD','FA','ED','EA',
'B','D','E','P','T','H','S');
postfixsorted : array[1..19] of TOpPostfix = (
PF_EP,PF_SB,PF_BT,PF_SH,
PF_IA,PF_IB,PF_DA,PF_DB,PF_FD,PF_FA,PF_ED,PF_EA,
PF_B,PF_D,PF_E,PF_P,PF_T,PF_H,PF_S);
var
len,
j,
sufidx : longint;
hs : string;
maxlen : longint;
icond : tasmcond;
Begin
{ making s a value parameter would break other assembler readers }
hs:=s;
is_asmopcode:=false;
{ clear op code }
actopcode:=A_None;
actcondition:=C_None;
{ first, handle B else BLS is read wrong }
if ((hs[1]='B') and (length(hs)=3)) then
begin
for icond:=low(tasmcond) to high(tasmcond) do
begin
if copy(hs,2,3)=uppercond2str[icond] then
begin
actopcode:=A_B;
actasmtoken:=AS_OPCODE;
actcondition:=icond;
is_asmopcode:=true;
exit;
end;
end;
end;
maxlen:=max(length(hs),5);
actopcode:=A_NONE;
for j:=maxlen downto 1 do
begin
actopcode:=tasmop(PtrInt(iasmops.Find(copy(hs,1,j))));
if actopcode<>A_NONE then
begin
actasmtoken:=AS_OPCODE;
{ strip op code }
delete(hs,1,j);
break;
end;
end;
if actopcode=A_NONE then
exit;
{ search for condition, conditions are always 2 chars }
if length(hs)>1 then
begin
for icond:=low(tasmcond) to high(tasmcond) do
begin
if copy(hs,1,2)=uppercond2str[icond] then
begin
actcondition:=icond;
{ strip condition }
delete(hs,1,2);
break;
end;
end;
end;
{ check for postfix }
if length(hs)>0 then
begin
for j:=low(postfixsorted) to high(postfixsorted) do
begin
if copy(hs,1,length(postfix2strsorted[j]))=postfix2strsorted[j] then
begin
actoppostfix:=postfixsorted[j];
{ strip postfix }
delete(hs,1,length(postfix2strsorted[j]));
break;
end;
end;
end;
{ if we stripped all postfixes, it's a valid opcode }
is_asmopcode:=length(hs)=0;
end;
procedure tarmattreader.ConvertCalljmp(instr : tarminstruction);
var
newopr : toprrec;
begin
if instr.Operands[1].opr.typ=OPR_REFERENCE then
begin
newopr.typ:=OPR_SYMBOL;
newopr.symbol:=instr.Operands[1].opr.ref.symbol;
newopr.symofs:=instr.Operands[1].opr.ref.offset;
if (instr.Operands[1].opr.ref.base<>NR_NO) or
(instr.Operands[1].opr.ref.index<>NR_NO) then
Message(asmr_e_syn_operand);
instr.Operands[1].opr:=newopr;
end;
end;
procedure tarmattreader.handleopcode;
var
instr : tarminstruction;
begin
instr:=TarmInstruction.Create(TarmOperand);
BuildOpcode(instr);
if is_calljmp(instr.opcode) then
ConvertCalljmp(instr);
{
instr.AddReferenceSizes;
instr.SetInstructionOpsize;
instr.CheckOperandSizes;
}
instr.ConcatInstruction(curlist);
instr.Free;
actoppostfix:=PF_None;
end;
{*****************************************************************************
Initialize
*****************************************************************************}
const
asmmode_arm_att_info : tasmmodeinfo =
(
id : asmmode_arm_gas;
idtxt : 'GAS';
casmreader : tarmattreader;
);
asmmode_arm_standard_info : tasmmodeinfo =
(
id : asmmode_standard;
idtxt : 'STANDARD';
casmreader : tarmattreader;
);
initialization
RegisterAsmMode(asmmode_arm_att_info);
RegisterAsmMode(asmmode_arm_standard_info);
end.
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