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{
$Id: rax86att.pas,v 1.11 2005/04/25 09:51:07 florian Exp $
Copyright (c) 1998-2002 by Carl Eric Codere and Peter Vreman
Does the parsing for the x86 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 rax86att;
{$i fpcdefs.inc}
Interface
uses
cpubase,
raatt,rax86;
type
tx86attreader = class(tattreader)
ActOpsize : topsize;
function is_asmopcode(const s: string):boolean;override;
procedure handleopcode;override;
procedure BuildReference(oper : tx86operand);
procedure BuildOperand(oper : tx86operand);
procedure BuildOpCode(instr : tx86instruction);
procedure handlepercent;override;
end;
Implementation
uses
{ helpers }
cutils,
{ global }
globtype,verbose,
systems,
{ aasm }
aasmbase,aasmtai,aasmcpu,
{ symtable }
symconst,
{ parser }
scanner,
procinfo,
itcpugas,
rabase,rautils,
cgbase
;
procedure tx86attreader.handlepercent;
var
len : longint;
begin
len:=1;
actasmpattern[len]:='%';
c:=current_scanner.asmgetchar;
{ to be a register there must be a letter and not a number }
if c in ['0'..'9'] then
begin
actasmtoken:=AS_MOD;
end
else
begin
while c in ['a'..'z','A'..'Z','0'..'9'] do
Begin
inc(len);
actasmpattern[len]:=c;
c:=current_scanner.asmgetchar;
end;
actasmpattern[0]:=chr(len);
uppervar(actasmpattern);
if (actasmpattern = '%ST') and (c='(') then
Begin
actasmpattern:=actasmpattern+c;
c:=current_scanner.asmgetchar;
if c in ['0'..'9'] then
actasmpattern:=actasmpattern + c
else
Message(asmr_e_invalid_fpu_register);
c:=current_scanner.asmgetchar;
if c <> ')' then
Message(asmr_e_invalid_fpu_register)
else
Begin
actasmpattern:=actasmpattern + c;
c:=current_scanner.asmgetchar; { let us point to next character. }
end;
end;
if is_register(actasmpattern) then
exit;
Message(asmr_e_invalid_register);
actasmtoken:=raatt.AS_NONE;
end;
end;
Procedure tx86attreader.BuildReference(oper : tx86operand);
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;
procedure Consume_Scale;
var
l : aint;
begin
{ we have to process the scaling }
l:=BuildConstExpression(false,true);
if ((l = 2) or (l = 4) or (l = 8) or (l = 1)) then
oper.opr.ref.scalefactor:=l
else
Begin
Message(asmr_e_wrong_scale_factor);
oper.opr.ref.scalefactor:=0;
end;
end;
begin
oper.InitRef;
Consume(AS_LPAREN);
Case actasmtoken of
AS_INTNUM,
AS_MINUS,
AS_PLUS: { absolute offset, such as fs:(0x046c) }
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_RParen;
end;
exit;
End;
AS_REGISTER: { (reg ... }
Begin
{ Check if there is already a base (mostly ebp,esp) than this is
not allowed, because it will give crashing code }
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 then
Begin
oper.opr.ref.index:=actasmregister;
Consume(AS_REGISTER);
{ check for scaling ... }
case actasmtoken of
AS_RPAREN:
Begin
Consume_RParen;
exit;
end;
AS_COMMA:
Begin
Consume(AS_COMMA);
Consume_Scale;
Consume_RParen;
end;
else
Begin
Message(asmr_e_invalid_reference_syntax);
RecoverConsume(false);
end;
end; { end case }
end
else
Begin
Message(asmr_e_invalid_reference_syntax);
RecoverConsume(false);
end;
end; {end case }
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 ... }
case actasmtoken of
AS_RPAREN:
Begin
Consume_RParen;
exit;
end;
AS_COMMA:
Begin
Consume(AS_COMMA);
Consume_Scale;
Consume_RParen;
end;
else
Begin
Message(asmr_e_invalid_reference_syntax);
RecoverConsume(false);
end;
end; {end case }
end
{ Scaling }
else
Begin
Consume_Scale;
Consume_RParen;
exit;
end;
end;
else
Begin
Message(asmr_e_invalid_reference_syntax);
RecoverConsume(false);
end;
end;
end;
Procedure tx86attreader.BuildOperand(oper : tx86operand);
var
tempstr,
expr : string;
typesize,l,k : 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
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);
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
(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 :
inc(oper.opr.ref.offset,l);
else
internalerror(200309221);
end;
end;
procedure handleat;
begin
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
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);
inc(oper.opr.ref.offset,l);
end;
if actasmtoken=AS_AT then
begin
consume(AS_AT);
if actasmtoken=AS_ID then
begin
if actasmpattern='GOTPCREL' then
oper.opr.ref.refaddr:=addr_pic
else
Message(asmr_e_invalid_reference_syntax);
end
else
Message(asmr_e_invalid_reference_syntax);
end;
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;
Begin
expr:='';
case actasmtoken of
AS_LPAREN: { Memory reference or constant expression }
Begin
oper.InitRef;
BuildReference(oper);
end;
AS_DOLLAR: { Constant expression }
Begin
Consume(AS_DOLLAR);
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
Message(asmr_e_invalid_reference_syntax)
else
BuildReference(oper);
end;
AS_STAR: { Call from memory address }
Begin
Consume(AS_STAR);
if actasmtoken=AS_REGISTER then
begin
oper.opr.typ:=OPR_REGISTER;
oper.opr.reg:=actasmregister;
oper.SetSize(tcgsize2size[reg_cgsize(actasmregister)],true);
Consume(AS_REGISTER);
end
else
begin
oper.InitRef;
if not MaybeBuildReference then
Message(asmr_e_syn_operand);
end;
{ this is only allowed for call's and jmp's }
if not is_calljmp(actopcode) then
Message(asmr_e_syn_operand);
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
begin
if actasmtoken=AS_AT then
begin
consume(AS_AT);
if actasmtoken=AS_ID then
begin
if actasmpattern='GOTPCREL' then
begin
oper.opr.ref.refaddr:=addr_pic;
consume(AS_ID);
end
else
Message(asmr_e_invalid_reference_syntax);
end
else
Message(asmr_e_invalid_reference_syntax);
end;
end
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 = AS_COLON then
Begin
Consume(AS_COLON);
oper.InitRef;
oper.opr.ref.segment:=tempreg;
{ This must absolutely be followed by a reference }
if not MaybeBuildReference then
Begin
Message(asmr_e_invalid_seg_override);
Consume(actasmtoken);
end;
end
{ Simple register }
else 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;
oper.SetSize(tcgsize2size[reg_cgsize(oper.opr.reg)],true);
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;
procedure tx86attreader.BuildOpCode(instr : tx86instruction);
var
operandnum : longint;
PrefixOp,OverrideOp: tasmop;
Begin
PrefixOp:=A_None;
OverrideOp:=A_None;
{ prefix seg opcode / prefix opcode }
repeat
if is_prefix(actopcode) then
begin
PrefixOp:=ActOpcode;
with instr do
begin
opcode:=ActOpcode;
condition:=ActCondition;
opsize:=ActOpsize;
ConcatInstruction(curlist);
end;
Consume(AS_OPCODE);
end
else
if is_override(actopcode) then
begin
OverrideOp:=ActOpcode;
with instr do
begin
opcode:=ActOpcode;
condition:=ActCondition;
opsize:=ActOpsize;
ConcatInstruction(curlist);
end;
Consume(AS_OPCODE);
end
else
break;
{ allow for newline as in gas styled syntax }
while actasmtoken=AS_SEPARATOR do
Consume(AS_SEPARATOR);
until (actasmtoken<>AS_OPCODE);
{ 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;
opsize:=ActOpsize;
end;
{ Valid combination of prefix/override and instruction ? }
if (prefixop<>A_NONE) and (NOT CheckPrefix(PrefixOp,actopcode)) then
Message1(asmr_e_invalid_prefix_and_opcode,actasmpattern);
if (overrideop<>A_NONE) and (NOT CheckOverride(OverrideOp,ActOpcode)) then
Message1(asmr_e_invalid_override_and_opcode,actasmpattern);
{ 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
Inc(operandnum);
Consume(AS_COMMA);
end;
AS_SEPARATOR,
AS_END : { End of asm operands for this opcode }
begin
break;
end;
else
BuildOperand(instr.Operands[operandnum] as tx86operand);
end; { end case }
until false;
instr.Ops:=operandnum;
end;
function tx86attreader.is_asmopcode(const s: string):boolean;
const
{ We need first to check the long prefixes, else we get probs
with things like movsbl }
att_sizesuffixstr : array[0..9] of string[2] = (
'','BW','BL','WL','B','W','L','S','Q','T'
);
att_sizesuffix : array[0..9] of topsize = (
S_NO,S_BW,S_BL,S_WL,S_B,S_W,S_L,S_FS,S_IQ,S_FX
);
att_sizefpusuffix : array[0..9] of topsize = (
S_NO,S_NO,S_NO,S_NO,S_NO,S_NO,S_FL,S_FS,S_IQ,S_FX
);
att_sizefpuintsuffix : array[0..9] of topsize = (
S_NO,S_NO,S_NO,S_NO,S_NO,S_NO,S_IL,S_IS,S_IQ,S_NO
);
var
str2opentry: tstr2opentry;
cond : string[4];
cnd : tasmcond;
len,
j,
sufidx : longint;
Begin
is_asmopcode:=FALSE;
actopcode:=A_None;
actcondition:=C_None;
actopsize:=S_NO;
{ search for all possible suffixes }
for sufidx:=low(att_sizesuffixstr) to high(att_sizesuffixstr) do
begin
len:=length(s)-length(att_sizesuffixstr[sufidx]);
if copy(s,len+1,length(att_sizesuffixstr[sufidx]))=att_sizesuffixstr[sufidx] then
begin
{ here we search the entire table... }
str2opentry:=nil;
if {(length(s)>0) and} (len>0) then
str2opentry:=tstr2opentry(iasmops.search(copy(s,1,len)));
if assigned(str2opentry) then
begin
actopcode:=str2opentry.op;
if gas_needsuffix[actopcode]=attsufFPU then
actopsize:=att_sizefpusuffix[sufidx]
else if gas_needsuffix[actopcode]=attsufFPUint then
actopsize:=att_sizefpuintsuffix[sufidx]
else
actopsize:=att_sizesuffix[sufidx];
actasmtoken:=AS_OPCODE;
is_asmopcode:=TRUE;
exit;
end;
{ not found, check condition opcodes }
j:=0;
while (j<CondAsmOps) do
begin
if Copy(s,1,Length(CondAsmOpStr[j]))=CondAsmOpStr[j] then
begin
cond:=Copy(s,Length(CondAsmOpStr[j])+1,len-Length(CondAsmOpStr[j]));
if cond<>'' then
begin
for cnd:=low(TasmCond) to high(TasmCond) do
if Cond=Upper(cond2str[cnd]) then
begin
actopcode:=CondASmOp[j];
if gas_needsuffix[actopcode]=attsufFPU then
actopsize:=att_sizefpusuffix[sufidx]
else if gas_needsuffix[actopcode]=attsufFPUint then
actopsize:=att_sizefpuintsuffix[sufidx]
else
actopsize:=att_sizesuffix[sufidx];
actcondition:=cnd;
actasmtoken:=AS_OPCODE;
is_asmopcode:=TRUE;
exit;
end;
end;
end;
inc(j);
end;
end;
end;
end;
procedure tx86attreader.handleopcode;
var
instr : Tx86Instruction;
begin
instr:=Tx86Instruction.Create(Tx86Operand);
instr.OpOrder:=op_att;
BuildOpcode(instr);
instr.AddReferenceSizes;
instr.SetInstructionOpsize;
instr.CheckOperandSizes;
instr.ConcatInstruction(curlist);
instr.Free;
end;
end.
{
$Log: rax86att.pas,v $
Revision 1.11 2005/04/25 09:51:07 florian
+ pic code reading for the assembler readers
* loadaddr generates pic code as well now
Revision 1.10 2005/02/14 17:13:10 peter
* truncate log
}
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