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f723f73f77
fpc/compiler/i386/ra386.pas
pierre f723f73f77 * correct last wrong fix for tw2158
2002-10-31 13:28:32 +00:00

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{
$Id$
Copyright (c) 1998-2002 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;
{$i fpcdefs.inc}
interface
uses
aasmbase,aasmtai,aasmcpu,
cpubase,rautils,cclasses;
{ Parser helpers }
function is_prefix(t:tasmop):boolean;
function is_override(t:tasmop):boolean;
Function CheckPrefix(prefixop,op:tasmop): Boolean;
Function CheckOverride(overrideop,op:tasmop): Boolean;
Procedure FWaitWarning;
type
T386Operand=class(TOperand)
Procedure SetCorrectSize(opcode:tasmop);override;
end;
T386Instruction=class(TInstruction)
{ Operand sizes }
procedure AddReferenceSizes;
procedure SetInstructionOpsize;
procedure CheckOperandSizes;
procedure CheckNonCommutativeOpcodes;
{ opcode adding }
procedure ConcatInstruction(p : taasmoutput);override;
end;
tstr2opentry = class(Tnamedindexitem)
op: TAsmOp;
end;
const
AsmPrefixes = 6;
AsmPrefix : array[0..AsmPrefixes-1] of TasmOP =(
A_LOCK,A_REP,A_REPE,A_REPNE,A_REPNZ,A_REPZ
);
AsmOverrides = 6;
AsmOverride : array[0..AsmOverrides-1] of TasmOP =(
A_SEGCS,A_SEGES,A_SEGDS,A_SEGFS,A_SEGGS,A_SEGSS
);
CondAsmOps=3;
CondAsmOp:array[0..CondAsmOps-1] of TasmOp=(
A_CMOVcc, A_Jcc, A_SETcc
);
CondAsmOpStr:array[0..CondAsmOps-1] of string[4]=(
'CMOV','J','SET'
);
{ Convert reg to opsize }
reg_2_opsize:array[firstreg..lastreg] of topsize = (S_NO,
S_L,S_L,S_L,S_L,S_L,S_L,S_L,S_L,
S_W,S_W,S_W,S_W,S_W,S_W,S_W,S_W,
S_B,S_B,S_B,S_B,S_B,S_B,S_B,S_B,
S_W,S_W,S_W,S_W,S_W,S_W,
S_FL,S_FL,S_FL,S_FL,S_FL,S_FL,S_FL,S_FL,S_FL,
S_L,S_L,S_L,S_L,S_L,S_L,
S_L,S_L,S_L,S_L,
S_L,S_L,S_L,S_L,S_L,
S_D,S_D,S_D,S_D,S_D,S_D,S_D,S_D,
S_D,S_D,S_D,S_D,S_D,S_D,S_D,S_D
);
implementation
uses
globtype,globals,systems,verbose,
cpuinfo,ag386att;
{$define ATTOP}
{$define INTELOP}
{$ifdef NORA386INT}
{$ifdef NOAG386NSM}
{$ifdef NOAG386INT}
{$undef INTELOP}
{$endif}
{$endif}
{$endif}
{$ifdef NORA386ATT}
{$ifdef NOAG386ATT}
{$undef ATTOP}
{$endif}
{$endif}
{*****************************************************************************
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.system=system_i386_GO32V2) and (cs_fp_emulation in aktmoduleswitches) then
Message(asmr_w_fwait_emu_prob);
end;
{*****************************************************************************
T386Operand
*****************************************************************************}
Procedure T386Operand.SetCorrectSize(opcode:tasmop);
begin
if gas_needsuffix[opcode]=attsufFPU then
begin
case size of
S_L : size:=S_FS;
S_IQ : size:=S_FL;
end;
end
else if gas_needsuffix[opcode]=attsufFPUint then
begin
case size of
S_W : size:=S_IS;
S_L : size:=S_IL;
end;
end;
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 : tasmsymbol;
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
begin
if ((opcode<>A_MOVD) and
(opcode<>A_CVTSI2SS)) then
operands[i].size:=operands[operand2].size;
end
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;
Fillchar(operands[i].opr.ref,sizeof(treference),0);
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_MOVD : { movd is a move from a mmx register to a
32 bit register or memory, so no opsize is correct here PM }
exit;
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:=1 to 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 in [R_ST..R_ST0])) 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;
if ((ops=1) and
(operands[1].opr.typ=OPR_REGISTER) and
(operands[1].opr.reg in [R_ST1..R_ST7])) then
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,asize : 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;
{ MOVD should be of size S_LQ or S_QL, but these do not exist PM }
if (ops=2) and (operands[1].size<>S_NO) and
(operands[2].size<>S_NO) and (operands[1].size<>operands[2].size) then
siz:=S_NO;
end;
if ((opcode=A_MOVD)or
(opcode=A_CVTSI2SS)) and
((operands[1].size=S_NO) or
(operands[2].size=S_NO)) then
siz:=S_NO;
{ 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 (ops=0) and
((opcode=A_FADD) or
(opcode=A_FMUL) or
(opcode=A_FSUB) or
(opcode=A_FSUBR) or
(opcode=A_FDIV) or
(opcode=A_FDIVR)) then
begin
if opcode=A_FADD then
opcode:=A_FADDP
else if opcode=A_FMUL then
opcode:=A_FMULP
else if opcode=A_FSUB then
opcode:=A_FSUBP
else if opcode=A_FSUBR then
opcode:=A_FSUBRP
else if opcode=A_FDIV then
opcode:=A_FDIVP
else if opcode=A_FDIVR then
opcode:=A_FDIVRP;
{$ifdef ATTOP}
message1(asmr_w_fadd_to_faddp,gas_op2str[opcode]);
{$else}
{$ifdef INTELOP}
message1(asmr_w_fadd_to_faddp,std_op2str[opcode]);
{$else}
message1(asmr_w_fadd_to_faddp,'fXX');
{$endif INTELOP}
{$endif ATTOP}
end;
{ GNU AS interprets FDIV without operand differently
for version 2.9.1 and 2.10
we add explicit args to it !! }
if (ops=0) and
((opcode=A_FSUBP) or
(opcode=A_FSUBRP) or
(opcode=A_FDIVP) or
(opcode=A_FDIVRP) or
(opcode=A_FSUB) or
(opcode=A_FSUBR) or
(opcode=A_FDIV) or
(opcode=A_FDIVR)) then
begin
{$ifdef ATTOP}
message1(asmr_w_adding_explicit_args_fXX,gas_op2str[opcode]);
{$else}
{$ifdef INTELOP}
message1(asmr_w_adding_explicit_args_fXX,std_op2str[opcode]);
{$else}
message1(asmr_w_adding_explicit_args_fXX,'fXX');
{$endif INTELOP}
{$endif ATTOP}
ops:=2;
operands[1].opr.typ:=OPR_REGISTER;
operands[2].opr.typ:=OPR_REGISTER;
operands[1].opr.reg:=R_ST;
operands[2].opr.reg:=R_ST1;
end;
if (ops=1) and
((operands[1].opr.typ=OPR_REGISTER) and
(operands[1].opr.reg in [R_ST1..R_ST7])) and
((opcode=A_FSUBP) or
(opcode=A_FSUBRP) or
(opcode=A_FDIVP) or
(opcode=A_FDIVRP) or
(opcode=A_FADDP) or
(opcode=A_FMULP)) then
begin
{$ifdef ATTOP}
message1(asmr_w_adding_explicit_first_arg_fXX,gas_op2str[opcode]);
{$else}
{$ifdef INTELOP}
message1(asmr_w_adding_explicit_first_arg_fXX,std_op2str[opcode]);
{$else}
message1(asmr_w_adding_explicit_first_arg_fXX,'fXX');
{$endif INTELOP}
{$endif ATTOP}
ops:=2;
operands[2].opr.typ:=OPR_REGISTER;
operands[2].opr.reg:=operands[1].opr.reg;
operands[1].opr.reg:=R_ST;
end;
if (ops=1) and
((operands[1].opr.typ=OPR_REGISTER) and
(operands[1].opr.reg in [R_ST1..R_ST7])) and
((opcode=A_FSUB) or
(opcode=A_FSUBR) or
(opcode=A_FDIV) or
(opcode=A_FDIVR) or
(opcode=A_FADD) or
(opcode=A_FMUL)) then
begin
{$ifdef ATTOP}
message1(asmr_w_adding_explicit_second_arg_fXX,gas_op2str[opcode]);
{$else}
{$ifdef INTELOP}
message1(asmr_w_adding_explicit_second_arg_fXX,std_op2str[opcode]);
{$else}
message1(asmr_w_adding_explicit_second_arg_fXX,'fXX');
{$endif INTELOP}
{$endif ATTOP}
ops:=2;
operands[2].opr.typ:=OPR_REGISTER;
operands[2].opr.reg:=R_ST;
end;
{ I tried to convince Linus Torwald to add
code to support ENTER instruction
(when raising a stack page fault)
but he replied that ENTER is a bad instruction and
Linux does not need to support it
So I think its at least a good idea to add a warning
if someone uses this in assembler code
FPC itself does not use it at all PM }
if (opcode=A_ENTER) and ((target_info.system=system_i386_linux) or
(target_info.system=system_i386_FreeBSD)) then
begin
message(asmr_w_enter_not_supported_by_linux);
end;
ai:=taicpu.op_none(opcode,siz);
ai.Ops:=Ops;
for i:=1to Ops do
begin
case operands[i].opr.typ of
OPR_CONSTANT :
ai.loadconst(i-1,aword(operands[i].opr.val));
OPR_REGISTER:
ai.loadreg(i-1,operands[i].opr.reg);
OPR_SYMBOL:
ai.loadsymbol(i-1,operands[i].opr.symbol,operands[i].opr.symofs);
OPR_REFERENCE:
begin
ai.loadref(i-1,operands[i].opr.ref);
if operands[i].size<>S_NO then
begin
asize:=0;
case operands[i].size of
S_B :
asize:=OT_BITS8;
S_W, S_IS :
asize:=OT_BITS16;
S_L, S_IL, S_FS:
asize:=OT_BITS32;
S_Q, S_D, S_FL, S_FV :
asize:=OT_BITS64;
S_FX :
asize:=OT_BITS80;
end;
if asize<>0 then
ai.oper[i-1].ot:=(ai.oper[i-1].ot and not OT_SIZE_MASK) or asize;
end;
end;
end;
end;
if (opcode=A_CALL) and (opsize=S_FAR) then
opcode:=A_LCALL;
if (opcode=A_JMP) and (opsize=S_FAR) then
opcode:=A_LJMP;
if (opcode=A_LCALL) or (opcode=A_LJMP) then
opsize:=S_FAR;
{ Condition ? }
if condition<>C_None then
ai.SetCondition(condition);
{ Concat the opcode or give an error }
if assigned(ai) then
begin
{ Check the instruction if it's valid }
{$ifndef NOAG386BIN}
ai.CheckIfValid;
{$endif NOAG386BIN}
p.concat(ai);
end
else
Message(asmr_e_invalid_opcode_and_operand);
end;
end.
{
$Log$
Revision 1.25 2002-10-31 13:28:32 pierre
* correct last wrong fix for tw2158
Revision 1.24 2002/10/30 17:10:00 pierre
* merge of fix for tw2158 bug
Revision 1.23 2002/07/26 21:15:44 florian
* rewrote the system handling
Revision 1.22 2002/07/01 18:46:34 peter
* internal linker
* reorganized aasm layer
Revision 1.21 2002/05/18 13:34:25 peter
* readded missing revisions
Revision 1.20 2002/05/16 19:46:52 carl
+ defines.inc -> fpcdefs.inc to avoid conflicts if compiling by hand
+ try to fix temp allocation (still in ifdef)
+ generic constructor calls
+ start of tassembler / tmodulebase class cleanup
Revision 1.18 2002/05/12 16:53:18 peter
* moved entry and exitcode to ncgutil and cgobj
* foreach gets extra argument for passing local data to the
iterator function
* -CR checks also class typecasts at runtime by changing them
into as
* fixed compiler to cycle with the -CR option
* fixed stabs with elf writer, finally the global variables can
be watched
* removed a lot of routines from cga unit and replaced them by
calls to cgobj
* u32bit-s32bit updates for and,or,xor nodes. When one element is
u32bit then the other is typecasted also to u32bit without giving
a rangecheck warning/error.
* fixed pascal calling method with reversing also the high tree in
the parast, detected by tcalcst3 test
Revision 1.17 2002/04/15 19:12:09 carl
+ target_info.size_of_pointer -> pointer_size
+ some cleanup of unused types/variables
* move several constants from cpubase to their specific units
(where they are used)
+ att_Reg2str -> gas_reg2str
+ int_reg2str -> std_reg2str
Revision 1.16 2002/04/04 19:06:13 peter
* removed unused units
* use tlocation.size in cg.a_*loc*() routines
Revision 1.15 2002/04/02 17:11:39 peter
* tlocation,treference update
* LOC_CONSTANT added for better constant handling
* secondadd splitted in multiple routines
* location_force_reg added for loading a location to a register
of a specified size
* secondassignment parses now first the right and then the left node
(this is compatible with Kylix). This saves a lot of push/pop especially
with string operations
* adapted some routines to use the new cg methods
Revision 1.14 2002/01/24 18:25:53 peter
* implicit result variable generation for assembler routines
* removed m_tp modeswitch, use m_tp7 or not(m_fpc) instead
}
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