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32b9cdb7cf
fpc/compiler/i386/ra386.pas
peter 32b9cdb7cf + new tlinkedlist class (merge of old tstringqueue,tcontainer and 
tlinkedlist objects)
2000-12-25 00:07:25 +00:00

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{
$Id$
Copyright (c) 1998-2000 by Carl Eric Codere and Peter Vreman
Handles the common i386 assembler reader routines
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 Ra386;
{$i defines.inc}
interface
uses
aasm,cpubase,RAUtils;
{ Parser helpers }
function is_prefix(t:tasmop):boolean;
function is_override(t:tasmop):boolean;
Function CheckPrefix(prefixop,op:tasmop): Boolean;
Function CheckOverride(overrideop,op:tasmop): Boolean;
Procedure FWaitWarning;
type
P386Operand=^T386Operand;
T386Operand=object(TOperand)
Procedure SetCorrectSize(opcode:tasmop);virtual;
Function SetupResult : boolean;virtual;
end;
P386Instruction=^T386Instruction;
T386Instruction=object(TInstruction)
{ Operand sizes }
procedure AddReferenceSizes;
procedure SetInstructionOpsize;
procedure CheckOperandSizes;
procedure CheckNonCommutativeOpcodes;
{ opcode adding }
procedure ConcatInstruction(p : taasmoutput);virtual;
end;
implementation
uses
{$ifdef NEWCG}
cgbase,
{$else}
hcodegen,
{$endif}
globtype,symconst,symdef,systems,types,globals,verbose,cpuasm;
{*****************************************************************************
Parser Helpers
*****************************************************************************}
function is_prefix(t:tasmop):boolean;
var
i : longint;
Begin
is_prefix:=false;
for i:=1 to AsmPrefixes do
if t=AsmPrefix[i-1] then
begin
is_prefix:=true;
exit;
end;
end;
function is_override(t:tasmop):boolean;
var
i : longint;
Begin
is_override:=false;
for i:=1 to AsmOverrides do
if t=AsmOverride[i-1] then
begin
is_override:=true;
exit;
end;
end;
Function CheckPrefix(prefixop,op:tasmop): Boolean;
{ Checks if the prefix is valid with the following opcode }
{ return false if not, otherwise true }
Begin
CheckPrefix := TRUE;
(* Case prefix of
A_REP,A_REPNE,A_REPE:
Case opcode Of
A_SCASB,A_SCASW,A_SCASD,
A_INS,A_OUTS,A_MOVS,A_CMPS,A_LODS,A_STOS:;
Else
Begin
CheckPrefix := FALSE;
exit;
end;
end; { case }
A_LOCK:
Case opcode Of
A_BT,A_BTS,A_BTR,A_BTC,A_XCHG,A_ADD,A_OR,A_ADC,A_SBB,A_AND,A_SUB,
A_XOR,A_NOT,A_NEG,A_INC,A_DEC:;
Else
Begin
CheckPrefix := FALSE;
Exit;
end;
end; { case }
A_NONE: exit; { no prefix here }
else
CheckPrefix := FALSE;
end; { end case } *)
end;
Function CheckOverride(overrideop,op:tasmop): Boolean;
{ Check if the override is valid, and if so then }
{ update the instr variable accordingly. }
Begin
CheckOverride := true;
{ Case instr.getinstruction of
A_MOVS,A_XLAT,A_CMPS:
Begin
CheckOverride := TRUE;
Message(assem_e_segment_override_not_supported);
end
end }
end;
Procedure FWaitWarning;
begin
if (target_info.target=target_i386_GO32V2) and (cs_fp_emulation in aktmoduleswitches) then
Message(asmr_w_fwait_emu_prob);
end;
{*****************************************************************************
T386Operand
*****************************************************************************}
Procedure T386Operand.SetCorrectSize(opcode:tasmop);
begin
if att_needsuffix[opcode]=attsufFPU then
begin
case size of
S_L : size:=S_FS;
S_IQ : size:=S_FL;
end;
end
else if att_needsuffix[opcode]=attsufFPUint then
begin
case size of
S_W : size:=S_IS;
S_L : size:=S_IL;
end;
end;
end;
Function T386Operand.SetupResult:boolean;
var
Res : boolean;
Begin
Res:=TOperand.setupResult;
{ replace by ref by register if not place was
reserved on stack }
if res and (procinfo^.return_offset=0) then
begin
opr.typ:=OPR_REGISTER;
if is_fpu(procinfo^.returntype.def) then
begin
opr.reg:=R_ST0;
case pfloatdef(procinfo^.returntype.def)^.typ of
s32real : size:=S_FS;
s64real : size:=S_FL;
s80real : size:=S_FX;
s64comp : size:=S_IQ;
else
begin
Message(asmr_e_cannot_use_RESULT_here);
res:=false;
end;
end;
end
else if ret_in_acc(procinfo^.returntype.def) then
case procinfo^.returntype.def^.size of
1 : begin
opr.reg:=R_AL;
size:=S_B;
end;
2 : begin
opr.reg:=R_AX;
size:=S_W;
end;
3,4 : begin
opr.reg:=R_EAX;
size:=S_L;
end;
else
begin
Message(asmr_e_cannot_use_RESULT_here);
res:=false;
end;
end;
Message1(asmr_h_RESULT_is_reg,reg2str(opr.reg));
end;
SetupResult:=res;
end;
{*****************************************************************************
T386Instruction
*****************************************************************************}
procedure T386Instruction.AddReferenceSizes;
{ this will add the sizes for references like [esi] which do not
have the size set yet, it will take only the size if the other
operand is a register }
var
operand2,i : longint;
s : pasmsymbol;
so : longint;
begin
for i:=1to ops do
begin
operands[i]^.SetCorrectSize(opcode);
if (operands[i]^.size=S_NO) then
begin
case operands[i]^.Opr.Typ of
OPR_REFERENCE :
begin
if i=2 then
operand2:=1
else
operand2:=2;
if operand2<ops then
begin
{ Only allow register as operand to take the size from }
if operands[operand2]^.opr.typ=OPR_REGISTER then
operands[i]^.size:=operands[operand2]^.size
else
begin
{ if no register then take the opsize (which is available with ATT),
if not availble then give an error }
if opsize<>S_NO then
operands[i]^.size:=opsize
else
begin
Message(asmr_e_unable_to_determine_reference_size);
{ recovery }
operands[i]^.size:=S_L;
end;
end;
end
else
begin
if opsize<>S_NO then
operands[i]^.size:=opsize
end;
end;
OPR_SYMBOL :
begin
{ Fix lea which need a reference }
if opcode=A_LEA then
begin
s:=operands[i]^.opr.symbol;
so:=operands[i]^.opr.symofs;
operands[i]^.opr.typ:=OPR_REFERENCE;
reset_reference(operands[i]^.opr.ref);
operands[i]^.opr.ref.symbol:=s;
operands[i]^.opr.ref.offset:=so;
end;
operands[i]^.size:=S_L;
end;
end;
end;
end;
end;
procedure T386Instruction.SetInstructionOpsize;
begin
if opsize<>S_NO then
exit;
case ops of
0 : ;
1 :
{ "push es" must be stored as a long PM }
if ((opcode=A_PUSH) or
(opcode=A_POP)) and
(operands[1]^.opr.typ=OPR_REGISTER) and
((operands[1]^.opr.reg>=firstsreg) and
(operands[1]^.opr.reg<=lastsreg)) then
opsize:=S_L
else
opsize:=operands[1]^.size;
2 :
begin
case opcode of
A_MOVZX,A_MOVSX :
begin
case operands[1]^.size of
S_W :
case operands[2]^.size of
S_L :
opsize:=S_WL;
end;
S_B :
case operands[2]^.size of
S_W :
opsize:=S_BW;
S_L :
opsize:=S_BL;
end;
end;
end;
A_OUT :
opsize:=operands[1]^.size;
else
opsize:=operands[2]^.size;
end;
end;
3 :
opsize:=operands[3]^.size;
end;
end;
procedure T386Instruction.CheckOperandSizes;
var
sizeerr : boolean;
i : longint;
begin
{ Check only the most common opcodes here, the others are done in
the assembler pass }
case opcode of
A_PUSH,A_POP,A_DEC,A_INC,A_NOT,A_NEG,
A_CMP,A_MOV,
A_ADD,A_SUB,A_ADC,A_SBB,
A_AND,A_OR,A_TEST,A_XOR: ;
else
exit;
end;
{ Handle the BW,BL,WL separatly }
sizeerr:=false;
{ special push/pop selector case }
if ((opcode=A_PUSH) or
(opcode=A_POP)) and
(operands[1]^.opr.typ=OPR_REGISTER) and
((operands[1]^.opr.reg>=firstsreg) and
(operands[1]^.opr.reg<=lastsreg)) then
exit;
if opsize in [S_BW,S_BL,S_WL] then
begin
if ops<>2 then
sizeerr:=true
else
begin
case opsize of
S_BW :
sizeerr:=(operands[1]^.size<>S_B) or (operands[2]^.size<>S_W);
S_BL :
sizeerr:=(operands[1]^.size<>S_B) or (operands[2]^.size<>S_L);
S_WL :
sizeerr:=(operands[1]^.size<>S_W) or (operands[2]^.size<>S_L);
end;
end;
end
else
begin
for i:=1to ops do
begin
if (operands[i]^.opr.typ<>OPR_CONSTANT) and
(operands[i]^.size in [S_B,S_W,S_L]) and
(operands[i]^.size<>opsize) then
sizeerr:=true;
end;
end;
if sizeerr then
begin
{ if range checks are on then generate an error }
if (cs_compilesystem in aktmoduleswitches) or
not (cs_check_range in aktlocalswitches) then
Message(asmr_w_size_suffix_and_dest_dont_match)
else
Message(asmr_e_size_suffix_and_dest_dont_match);
end;
end;
{ This check must be done with the operand in ATT order
i.e.after swapping in the intel reader
but before swapping in the NASM and TASM writers PM }
procedure T386Instruction.CheckNonCommutativeOpcodes;
begin
if ((ops=2) and
(operands[1]^.opr.typ=OPR_REGISTER) and
(operands[2]^.opr.typ=OPR_REGISTER) and
{ if the first is ST and the second is also a register
it is necessarily ST1 .. ST7 }
(operands[1]^.opr.reg=R_ST)) or
((ops=1) and
(operands[1]^.opr.typ=OPR_REGISTER) and
(operands[1]^.opr.reg in [R_ST1..R_ST7])) or
(ops=0) then
if opcode=A_FSUBR then
opcode:=A_FSUB
else if opcode=A_FSUB then
opcode:=A_FSUBR
else if opcode=A_FDIVR then
opcode:=A_FDIV
else if opcode=A_FDIV then
opcode:=A_FDIVR
else if opcode=A_FSUBRP then
opcode:=A_FSUBP
else if opcode=A_FSUBP then
opcode:=A_FSUBRP
else if opcode=A_FDIVRP then
opcode:=A_FDIVP
else if opcode=A_FDIVP then
opcode:=A_FDIVRP;
end;
{*****************************************************************************
opcode Adding
*****************************************************************************}
procedure T386Instruction.ConcatInstruction(p : taasmoutput);
var
siz : topsize;
i : longint;
ai : taicpu;
begin
{ Get Opsize }
if (opsize<>S_NO) or (Ops=0) then
siz:=opsize
else
begin
if (Ops=2) and (operands[1]^.opr.typ=OPR_REGISTER) then
siz:=operands[1]^.size
else
siz:=operands[Ops]^.size;
end;
{ NASM does not support FADD without args
as alias of FADDP
and GNU AS interprets FADD without operand differently
for version 2.9.1 and 2.9.5 !! }
if (opcode=A_FADD) and (ops=0) then
begin
opcode:=A_FADDP;
message(asmr_w_fadd_to_faddp);
end;
{ I tried to convince Linus Torwald to add
code to support ENTER instruction
(when raising a stack page fault)
but he replied that ENTER is a bad instruction and
Linux does not need to support it
So I think its at least a good idea to add a warning
if someone uses this in assembler code
FPC itself does not use it at all PM }
if (opcode=A_ENTER) and ((target_info.target=target_i386_linux) or
(target_info.target=target_i386_FreeBSD)) then
begin
message(asmr_w_enter_not_supported_by_linux);
end;
ai:=taicpu.op_none(opcode,siz);
ai.Ops:=Ops;
for i:=1to Ops do
begin
case operands[i]^.opr.typ of
OPR_CONSTANT :
ai.loadconst(i-1,operands[i]^.opr.val);
OPR_REGISTER:
ai.loadreg(i-1,operands[i]^.opr.reg);
OPR_SYMBOL:
ai.loadsymbol(i-1,operands[i]^.opr.symbol,operands[i]^.opr.symofs);
OPR_REFERENCE:
ai.loadref(i-1,newreference(operands[i]^.opr.ref));
end;
end;
{ Condition ? }
if condition<>C_None then
ai.SetCondition(condition);
{ Concat the opcode or give an error }
if assigned(ai) then
p.concat(ai)
else
Message(asmr_e_invalid_opcode_and_operand);
end;
end.
{
$Log$
Revision 1.4 2000-12-25 00:07:34 peter
+ new tlinkedlist class (merge of old tstringqueue,tcontainer and
tlinkedlist objects)
Revision 1.3 2000/11/29 00:30:50 florian
* unused units removed from uses clause
* some changes for widestrings
Revision 1.2 2000/10/31 22:30:14 peter
* merged asm result patch part 2
Revision 1.1 2000/10/15 09:47:43 peter
* moved to i386/
Revision 1.7 2000/10/08 10:26:33 peter
* merged @result fix from Pierre
Revision 1.6 2000/09/24 21:33:47 peter
* message updates merges
Revision 1.5 2000/09/24 15:06:25 peter
* use defines.inc
Revision 1.4 2000/09/16 12:22:52 peter
* freebsd support merged
Revision 1.3 2000/09/03 11:44:00 peter
* error for not specified operand size, which is now required for
newer binutils (merged)
* previous commit fix for tcflw (merged)
Revision 1.2 2000/07/13 11:32:47 michael
+ removed logs
}
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