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813 lines
26 KiB
ObjectPascal
813 lines
26 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 ARM 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 raarmgas;
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{$i fpcdefs.inc}
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Interface
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uses
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raatt,raarm,
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cpubase;
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type
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tarmattreader = class(tattreader)
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actoppostfix : TOpPostfix;
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function is_asmopcode(const s: string):boolean;override;
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function is_register(const s:string):boolean;override;
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procedure handleopcode;override;
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procedure BuildReference(oper : tarmoperand);
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procedure BuildOperand(oper : tarmoperand);
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function TryBuildShifterOp(oper : tarmoperand) : boolean;
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procedure BuildOpCode(instr : tarminstruction);
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procedure ReadSym(oper : tarmoperand);
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procedure ConvertCalljmp(instr : tarminstruction);
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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,globals,verbose,
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systems,
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{ aasm }
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cpuinfo,aasmbase,aasmtai,aasmdata,aasmcpu,
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{ symtable }
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symconst,symbase,symtype,symsym,symtable,
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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,cgobj
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;
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function tarmattreader.is_register(const s:string):boolean;
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type
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treg2str = record
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name : string[2];
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reg : tregister;
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end;
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const
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extraregs : array[0..19] of treg2str = (
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(name: 'A1'; reg : NR_R0),
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(name: 'A2'; reg : NR_R1),
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(name: 'A3'; reg : NR_R2),
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(name: 'A4'; reg : NR_R3),
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(name: 'V1'; reg : NR_R4),
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(name: 'V2'; reg : NR_R5),
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(name: 'V3'; reg : NR_R6),
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(name: 'V4'; reg : NR_R7),
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(name: 'V5'; reg : NR_R8),
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(name: 'V6'; reg : NR_R9),
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(name: 'V7'; reg : NR_R10),
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(name: 'V8'; reg : NR_R11),
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(name: 'WR'; reg : NR_R7),
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(name: 'SB'; reg : NR_R9),
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(name: 'SL'; reg : NR_R10),
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(name: 'FP'; reg : NR_R11),
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(name: 'IP'; reg : NR_R12),
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(name: 'SP'; reg : NR_R13),
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(name: 'LR'; reg : NR_R14),
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(name: 'PC'; reg : NR_R15));
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var
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i : longint;
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begin
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result:=inherited is_register(s);
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{ reg found?
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possible aliases are always 2 char
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}
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if result or (length(s)<>2) then
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exit;
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for i:=low(extraregs) to high(extraregs) do
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begin
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if s=extraregs[i].name then
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begin
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actasmregister:=extraregs[i].reg;
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result:=true;
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actasmtoken:=AS_REGISTER;
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exit;
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end;
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end;
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end;
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procedure tarmattreader.ReadSym(oper : tarmoperand);
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var
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tempstr, mangledname : string;
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typesize,l,k : longint;
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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,mangledname,false);
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if (mangledname<>'') then
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Message(asmr_e_invalid_reference_syntax);
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inc(oper.opr.ref.offset,l);
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end;
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end;
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Procedure tarmattreader.BuildReference(oper : tarmoperand);
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procedure Consume_RBracket;
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begin
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if actasmtoken<>AS_RBRACKET 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_RBRACKET);
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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 read_index;
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begin
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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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end
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else if actasmtoken=AS_HASH then
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begin
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Consume(AS_HASH);
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inc(oper.opr.ref.offset,BuildConstExpression(false,true));
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end;
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end;
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begin
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Consume(AS_LBRACKET);
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if actasmtoken=AS_REGISTER then
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begin
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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_RBRACKET then
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Begin
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Consume_RBracket;
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oper.opr.ref.addressmode:=AM_POSTINDEXED;
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if actasmtoken=AS_COMMA then
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read_index;
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exit;
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end;
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if actasmtoken=AS_COMMA then
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begin
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read_index;
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Consume_RBracket;
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end;
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if actasmtoken=AS_NOT then
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begin
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consume(AS_NOT);
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oper.opr.ref.addressmode:=AM_PREINDEXED;
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end;
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end {end case }
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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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function tarmattreader.TryBuildShifterOp(oper : tarmoperand) : boolean;
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procedure handlepara(sm : tshiftmode);
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begin
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consume(AS_ID);
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fillchar(oper.opr,sizeof(oper.opr),0);
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oper.opr.typ:=OPR_SHIFTEROP;
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oper.opr.shifterop.shiftmode:=sm;
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if sm<>SM_RRX then
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begin
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case actasmtoken of
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AS_REGISTER:
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begin
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oper.opr.shifterop.rs:=actasmregister;
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consume(AS_REGISTER);
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end;
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AS_HASH:
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begin
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consume(AS_HASH);
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oper.opr.shifterop.shiftimm:=BuildConstExpression(false,false);
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end;
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else
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Message(asmr_e_illegal_shifterop_syntax);
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end;
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end;
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end;
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begin
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result:=true;
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if (actasmtoken=AS_ID) then
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begin
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if (actasmpattern='LSL') then
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handlepara(SM_LSL)
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else if (actasmpattern='LSR') then
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handlepara(SM_LSR)
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else if (actasmpattern='ASR') then
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handlepara(SM_ASR)
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else if (actasmpattern='ROR') then
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handlepara(SM_ROR)
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else if (actasmpattern='RRX') then
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handlepara(SM_ROR)
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else
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result:=false;
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end
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else
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result:=false;
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end;
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Procedure tarmattreader.BuildOperand(oper : tarmoperand);
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var
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expr : string;
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typesize,l : longint;
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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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mangledname: string;
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hasdot : boolean;
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l,
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toffset,
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tsize : longint;
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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,mangledname,false);
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if (oper.opr.typ<>OPR_CONSTANT) and
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(mangledname<>'') then
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Message(asmr_e_wrong_sym_type);
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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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(tabstractnormalvarsym(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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if (mangledname<>'') then
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begin
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if (oper.opr.val<>0) then
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Message(asmr_e_wrong_sym_type);
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oper.opr.typ:=OPR_SYMBOL;
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oper.opr.symbol:=current_asmdata.RefAsmSymbol(mangledname);
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end
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else
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inc(oper.opr.val,l);
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OPR_SYMBOL:
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Message(asmr_e_invalid_symbol_ref);
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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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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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ReadSym(oper);
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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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ireg : tsuperregister;
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hl : tasmlabel;
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ofs : longint;
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registerset : tcpuregisterset;
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Begin
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expr:='';
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case actasmtoken of
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AS_LBRACKET: { 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_HASH: { Constant expression }
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Begin
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Consume(AS_HASH);
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BuildConstantOperand(oper);
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end;
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(*
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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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begin
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ofs:=oper.opr.ref.offset;
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BuildConstantOperand(oper);
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inc(oper.opr.val,ofs);
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end
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else
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BuildReference(oper);
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end;
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*)
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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 not(oper.SetupVar(expr,false)) then
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Begin
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{ look for special symbols ... }
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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;
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end;
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if actasmtoken=AS_DOT then
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MaybeRecordOffset;
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{ add a constant expression? }
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if (actasmtoken=AS_PLUS) then
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begin
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l:=BuildConstExpression(true,false);
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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;
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end
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end;
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{ Do we have a indexing reference, then parse it also }
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if actasmtoken=AS_LPAREN then
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BuildReference(oper);
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end;
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{ Register, a variable reference or a constant reference }
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AS_REGISTER:
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Begin
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{ save the type of register used. }
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tempreg:=actasmregister;
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Consume(AS_REGISTER);
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if (actasmtoken in [AS_END,AS_SEPARATOR,AS_COMMA]) then
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Begin
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if not (oper.opr.typ in [OPR_NONE,OPR_REGISTER]) then
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Message(asmr_e_invalid_operand_type);
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oper.opr.typ:=OPR_REGISTER;
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oper.opr.reg:=tempreg;
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end
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else if (actasmtoken=AS_NOT) and (actopcode in [A_LDM,A_STM]) then
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begin
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consume(AS_NOT);
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oper.opr.typ:=OPR_REFERENCE;
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oper.opr.ref.addressmode:=AM_PREINDEXED;
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oper.opr.ref.index:=tempreg;
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end
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else
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Message(asmr_e_syn_operand);
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end;
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{ Registerset }
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AS_LSBRACKET:
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begin
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consume(AS_LSBRACKET);
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registerset:=[];
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while true do
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begin
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if actasmtoken=AS_REGISTER then
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begin
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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,A_MLA])) 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.
|