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819 lines
27 KiB
ObjectPascal
819 lines
27 KiB
ObjectPascal
{
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Copyright (c) 1998-2002 by Carl Eric Codere and Peter Vreman
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Does the parsing for the x86 GNU AS styled inline assembler.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************
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}
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Unit rax86att;
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{$i fpcdefs.inc}
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Interface
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uses
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cpubase,
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raatt,rax86;
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type
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tx86attreader = class(tattreader)
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ActOpsize : topsize;
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function is_asmopcode(const s: string):boolean;override;
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procedure handleopcode;override;
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procedure BuildReference(oper : tx86operand);
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procedure BuildOperand(oper : tx86operand);
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procedure BuildOpCode(instr : tx86instruction);
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procedure handlepercent;override;
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end;
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Implementation
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uses
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{ helpers }
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cutils,
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{ global }
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globtype,verbose,
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systems,
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{ aasm }
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aasmbase,aasmtai,aasmcpu,
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{ symtable }
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symconst,
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{ parser }
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scanner,
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procinfo,
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itcpugas,
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rabase,rautils,
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cgbase
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;
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procedure tx86attreader.handlepercent;
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var
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len : longint;
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begin
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len:=1;
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actasmpattern[len]:='%';
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c:=current_scanner.asmgetchar;
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{ to be a register there must be a letter and not a number }
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if c in ['0'..'9'] then
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begin
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actasmtoken:=AS_MOD;
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end
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else
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begin
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while c in ['a'..'z','A'..'Z','0'..'9'] do
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Begin
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inc(len);
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actasmpattern[len]:=c;
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c:=current_scanner.asmgetchar;
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end;
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actasmpattern[0]:=chr(len);
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uppervar(actasmpattern);
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if (actasmpattern = '%ST') and (c='(') then
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Begin
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actasmpattern:=actasmpattern+c;
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c:=current_scanner.asmgetchar;
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if c in ['0'..'9'] then
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actasmpattern:=actasmpattern + c
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else
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Message(asmr_e_invalid_fpu_register);
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c:=current_scanner.asmgetchar;
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if c <> ')' then
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Message(asmr_e_invalid_fpu_register)
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else
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Begin
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actasmpattern:=actasmpattern + c;
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c:=current_scanner.asmgetchar; { let us point to next character. }
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end;
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end;
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if is_register(actasmpattern) then
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exit;
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Message(asmr_e_invalid_register);
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actasmtoken:=raatt.AS_NONE;
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end;
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end;
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Procedure tx86attreader.BuildReference(oper : tx86operand);
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procedure Consume_RParen;
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begin
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if actasmtoken <> AS_RPAREN then
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Begin
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Message(asmr_e_invalid_reference_syntax);
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RecoverConsume(true);
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end
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else
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begin
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Consume(AS_RPAREN);
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if not (actasmtoken in [AS_COMMA,AS_SEPARATOR,AS_END]) then
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Begin
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Message(asmr_e_invalid_reference_syntax);
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RecoverConsume(true);
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end;
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end;
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end;
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procedure Consume_Scale;
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var
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l : aint;
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begin
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{ we have to process the scaling }
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l:=BuildConstExpression(false,true);
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if ((l = 2) or (l = 4) or (l = 8) or (l = 1)) then
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oper.opr.ref.scalefactor:=l
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else
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Begin
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Message(asmr_e_wrong_scale_factor);
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oper.opr.ref.scalefactor:=0;
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end;
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end;
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begin
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oper.InitRef;
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Consume(AS_LPAREN);
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Case actasmtoken of
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AS_INTNUM,
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AS_MINUS,
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AS_PLUS: { absolute offset, such as fs:(0x046c) }
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Begin
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{ offset(offset) is invalid }
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If oper.opr.Ref.Offset <> 0 Then
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Begin
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Message(asmr_e_invalid_reference_syntax);
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RecoverConsume(true);
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End
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Else
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Begin
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oper.opr.Ref.Offset:=BuildConstExpression(false,true);
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Consume_RParen;
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end;
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exit;
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End;
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AS_REGISTER: { (reg ... }
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Begin
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{ Check if there is already a base (mostly ebp,esp) than this is
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not allowed, because it will give crashing code }
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if ((oper.opr.typ=OPR_REFERENCE) and (oper.opr.ref.base<>NR_NO)) or
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((oper.opr.typ=OPR_LOCAL) and (oper.opr.localsym.localloc.loc<>LOC_REGISTER)) then
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message(asmr_e_cannot_index_relative_var);
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oper.opr.ref.base:=actasmregister;
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Consume(AS_REGISTER);
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{ can either be a register or a right parenthesis }
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{ (reg) }
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if actasmtoken=AS_RPAREN then
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Begin
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Consume_RParen;
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exit;
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end;
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{ (reg,reg .. }
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Consume(AS_COMMA);
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if actasmtoken=AS_REGISTER then
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Begin
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oper.opr.ref.index:=actasmregister;
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Consume(AS_REGISTER);
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{ check for scaling ... }
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case actasmtoken of
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AS_RPAREN:
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Begin
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Consume_RParen;
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exit;
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end;
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AS_COMMA:
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Begin
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Consume(AS_COMMA);
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Consume_Scale;
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Consume_RParen;
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end;
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else
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Begin
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Message(asmr_e_invalid_reference_syntax);
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RecoverConsume(false);
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end;
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end; { end case }
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end
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else
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Begin
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Message(asmr_e_invalid_reference_syntax);
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RecoverConsume(false);
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end;
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end; {end case }
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AS_COMMA: { (, ... can either be scaling, or index }
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Begin
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Consume(AS_COMMA);
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{ Index }
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if (actasmtoken=AS_REGISTER) then
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Begin
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oper.opr.ref.index:=actasmregister;
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Consume(AS_REGISTER);
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{ check for scaling ... }
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case actasmtoken of
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AS_RPAREN:
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Begin
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Consume_RParen;
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exit;
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end;
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AS_COMMA:
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Begin
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Consume(AS_COMMA);
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Consume_Scale;
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Consume_RParen;
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end;
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else
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Begin
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Message(asmr_e_invalid_reference_syntax);
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RecoverConsume(false);
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end;
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end; {end case }
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end
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{ Scaling }
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else
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Begin
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Consume_Scale;
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Consume_RParen;
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exit;
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end;
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end;
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else
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Begin
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Message(asmr_e_invalid_reference_syntax);
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RecoverConsume(false);
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end;
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end;
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end;
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Procedure tx86attreader.BuildOperand(oper : tx86operand);
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var
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tempstr,
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expr : string;
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typesize,l,k : aint;
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procedure AddLabelOperand(hl:tasmlabel);
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begin
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if not(actasmtoken in [AS_PLUS,AS_MINUS,AS_LPAREN]) and
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is_calljmp(actopcode) then
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begin
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oper.opr.typ:=OPR_SYMBOL;
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oper.opr.symbol:=hl;
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end
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else
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begin
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oper.InitRef;
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oper.opr.ref.symbol:=hl;
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end;
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end;
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procedure MaybeRecordOffset;
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var
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hasdot : boolean;
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l,
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toffset,
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tsize : aint;
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begin
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if not(actasmtoken in [AS_DOT,AS_PLUS,AS_MINUS]) then
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exit;
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l:=0;
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hasdot:=(actasmtoken=AS_DOT);
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if hasdot then
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begin
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if expr<>'' then
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begin
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BuildRecordOffsetSize(expr,toffset,tsize);
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inc(l,toffset);
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oper.SetSize(tsize,true);
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end;
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end;
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if actasmtoken in [AS_PLUS,AS_MINUS] then
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inc(l,BuildConstExpression(true,false));
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case oper.opr.typ of
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OPR_LOCAL :
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begin
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{ don't allow direct access to fields of parameters, because that
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will generate buggy code. Allow it only for explicit typecasting }
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if hasdot and
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(not oper.hastype) and
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(oper.opr.localsym.owner.symtabletype=parasymtable) and
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(current_procinfo.procdef.proccalloption<>pocall_register) then
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Message(asmr_e_cannot_access_field_directly_for_parameters);
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inc(oper.opr.localsymofs,l)
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end;
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OPR_CONSTANT :
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inc(oper.opr.val,l);
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OPR_REFERENCE :
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inc(oper.opr.ref.offset,l);
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else
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internalerror(200309221);
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end;
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end;
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procedure handleat;
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begin
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end;
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function MaybeBuildReference:boolean;
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{ Try to create a reference, if not a reference is found then false
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is returned }
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begin
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MaybeBuildReference:=true;
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case actasmtoken of
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AS_INTNUM,
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AS_MINUS,
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AS_PLUS:
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Begin
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oper.opr.ref.offset:=BuildConstExpression(True,False);
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if actasmtoken<>AS_LPAREN then
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Message(asmr_e_invalid_reference_syntax)
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else
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BuildReference(oper);
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end;
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AS_LPAREN:
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BuildReference(oper);
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AS_ID: { only a variable is allowed ... }
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Begin
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tempstr:=actasmpattern;
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Consume(AS_ID);
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{ typecasting? }
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if (actasmtoken=AS_LPAREN) and
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SearchType(tempstr,typesize) then
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begin
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oper.hastype:=true;
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Consume(AS_LPAREN);
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BuildOperand(oper);
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Consume(AS_RPAREN);
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if oper.opr.typ in [OPR_REFERENCE,OPR_LOCAL] then
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oper.SetSize(typesize,true);
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end
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else
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if not oper.SetupVar(tempstr,false) then
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Message1(sym_e_unknown_id,tempstr);
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{ record.field ? }
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if actasmtoken=AS_DOT then
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begin
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BuildRecordOffsetSize(tempstr,l,k);
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inc(oper.opr.ref.offset,l);
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end;
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if actasmtoken=AS_AT then
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begin
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consume(AS_AT);
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if actasmtoken=AS_ID then
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begin
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{$ifdef x86_64}
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if actasmpattern='GOTPCREL' then
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{$endif x86_64}
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{$ifdef i386}
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if actasmpattern='GOT' then
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{$endif i386}
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oper.opr.ref.refaddr:=addr_pic
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else
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Message(asmr_e_invalid_reference_syntax);
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end
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else
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Message(asmr_e_invalid_reference_syntax);
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end;
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case actasmtoken of
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AS_END,
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AS_SEPARATOR,
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AS_COMMA: ;
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AS_LPAREN:
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BuildReference(oper);
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else
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Begin
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Message(asmr_e_invalid_reference_syntax);
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Consume(actasmtoken);
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end;
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end; {end case }
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end;
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else
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MaybeBuildReference:=false;
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end; { end case }
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end;
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var
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tempreg : tregister;
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hl : tasmlabel;
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Begin
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expr:='';
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case actasmtoken of
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AS_LPAREN: { Memory reference or constant expression }
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Begin
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oper.InitRef;
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BuildReference(oper);
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end;
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AS_DOLLAR: { Constant expression }
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Begin
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Consume(AS_DOLLAR);
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BuildConstantOperand(oper);
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end;
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AS_INTNUM,
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AS_MINUS,
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AS_PLUS:
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Begin
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{ Constant memory offset }
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{ This must absolutely be followed by ( }
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oper.InitRef;
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oper.opr.ref.offset:=BuildConstExpression(True,False);
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if actasmtoken<>AS_LPAREN then
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Message(asmr_e_invalid_reference_syntax)
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else
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BuildReference(oper);
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end;
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AS_STAR: { Call from memory address }
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Begin
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Consume(AS_STAR);
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if actasmtoken=AS_REGISTER then
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begin
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oper.opr.typ:=OPR_REGISTER;
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oper.opr.reg:=actasmregister;
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oper.SetSize(tcgsize2size[reg_cgsize(actasmregister)],true);
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Consume(AS_REGISTER);
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end
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else
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begin
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oper.InitRef;
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if not MaybeBuildReference then
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Message(asmr_e_syn_operand);
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end;
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{ this is only allowed for call's and jmp's }
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if not is_calljmp(actopcode) then
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Message(asmr_e_syn_operand);
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end;
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AS_ID: { A constant expression, or a Variable ref. }
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Begin
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{ Local Label ? }
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if is_locallabel(actasmpattern) then
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begin
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CreateLocalLabel(actasmpattern,hl,false);
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Consume(AS_ID);
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AddLabelOperand(hl);
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end
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else
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{ Check for label }
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if SearchLabel(actasmpattern,hl,false) then
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begin
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Consume(AS_ID);
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AddLabelOperand(hl);
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end
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else
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{ probably a variable or normal expression }
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{ or a procedure (such as in CALL ID) }
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Begin
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{ is it a constant ? }
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if SearchIConstant(actasmpattern,l) then
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Begin
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if not (oper.opr.typ in [OPR_NONE,OPR_CONSTANT]) then
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Message(asmr_e_invalid_operand_type);
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BuildConstantOperand(oper);
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end
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else
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begin
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expr:=actasmpattern;
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Consume(AS_ID);
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{ typecasting? }
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if (actasmtoken=AS_LPAREN) and
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SearchType(expr,typesize) then
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begin
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oper.hastype:=true;
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Consume(AS_LPAREN);
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BuildOperand(oper);
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Consume(AS_RPAREN);
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if oper.opr.typ in [OPR_REFERENCE,OPR_LOCAL] then
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oper.SetSize(typesize,true);
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end
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else
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begin
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if oper.SetupVar(expr,false) then
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begin
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if actasmtoken=AS_AT then
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begin
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consume(AS_AT);
|
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if actasmtoken=AS_ID then
|
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begin
|
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{$ifdef x86_64}
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if actasmpattern='GOTPCREL' then
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{$endif x86_64}
|
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{$ifdef i386}
|
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if actasmpattern='GOT' then
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{$endif i386}
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begin
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oper.opr.ref.refaddr:=addr_pic;
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consume(AS_ID);
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end
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else
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Message(asmr_e_invalid_reference_syntax);
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end
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else
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Message(asmr_e_invalid_reference_syntax);
|
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end;
|
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end
|
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else
|
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Begin
|
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{ look for special symbols ... }
|
|
if expr= '__HIGH' then
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begin
|
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consume(AS_LPAREN);
|
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if not oper.setupvar('high'+actasmpattern,false) then
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Message1(sym_e_unknown_id,'high'+actasmpattern);
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consume(AS_ID);
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consume(AS_RPAREN);
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end
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else
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if expr = '__RESULT' then
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oper.SetUpResult
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else
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if expr = '__SELF' then
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oper.SetupSelf
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else
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if expr = '__OLDEBP' then
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oper.SetupOldEBP
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else
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Message1(sym_e_unknown_id,expr);
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|
end;
|
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end;
|
|
end;
|
|
if actasmtoken=AS_DOT then
|
|
MaybeRecordOffset;
|
|
{ add a constant expression? }
|
|
if (actasmtoken=AS_PLUS) then
|
|
begin
|
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l:=BuildConstExpression(true,false);
|
|
case oper.opr.typ of
|
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OPR_CONSTANT :
|
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inc(oper.opr.val,l);
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OPR_LOCAL :
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inc(oper.opr.localsymofs,l);
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OPR_REFERENCE :
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inc(oper.opr.ref.offset,l);
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else
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|
internalerror(200309202);
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|
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.
|