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00c901b3c1
fpc/compiler/i386/cpuasm.pas
peter 00c901b3c1 * check for valid asm instructions
2001-01-12 19:18:42 +00:00

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{
$Id$
Copyright (c) 1998-2000 by Florian Klaempfl and Peter Vreman
Contains the assembler object for the i386
* This code was inspired by the NASM sources
The Netwide Assembler is copyright (C) 1996 Simon Tatham and
Julian Hall. All rights reserved.
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 cpuasm;
{$i defines.inc}
{ Optimize addressing and skip already passed nodes }
{$ifndef NASMDEBUG}
{$define OPTEA}
{$define PASS2FLAG}
{$endif ndef NASMDEBUG}
{ Give warnings when an immediate is found in the reference struct }
{.$define REF_IMMEDIATE_WARN}
interface
uses
cobjects,cclasses,
aasm,globals,verbose,
cpubase;
const
MaxPrefixes=4;
type
tairegalloc = class(tai)
allocation : boolean;
reg : tregister;
constructor alloc(r : tregister);
constructor dealloc(r : tregister);
end;
{ alignment for operator }
tai_align = class(tai_align_abstract)
reg : tregister;
constructor create(b:byte);
constructor create_op(b: byte; _op: byte);
function getfillbuf:pchar;
end;
taicpu = class(tai)
is_jmp : boolean; { is this instruction a jump? (needed for optimizer) }
opcode : tasmop;
opsize : topsize;
condition : TAsmCond;
ops : longint;
oper : array[0..2] of toper;
constructor op_none(op : tasmop;_size : topsize);
constructor op_reg(op : tasmop;_size : topsize;_op1 : tregister);
constructor op_const(op : tasmop;_size : topsize;_op1 : longint);
constructor op_ref(op : tasmop;_size : topsize;_op1 : preference);
constructor op_reg_reg(op : tasmop;_size : topsize;_op1,_op2 : tregister);
constructor op_reg_ref(op : tasmop;_size : topsize;_op1 : tregister;_op2 : preference);
constructor op_reg_const(op:tasmop; _size: topsize; _op1: tregister; _op2: longint);
constructor op_const_reg(op : tasmop;_size : topsize;_op1 : longint;_op2 : tregister);
constructor op_const_const(op : tasmop;_size : topsize;_op1,_op2 : longint);
constructor op_const_ref(op : tasmop;_size : topsize;_op1 : longint;_op2 : preference);
constructor op_ref_reg(op : tasmop;_size : topsize;_op1 : preference;_op2 : tregister);
{ this is only allowed if _op1 is an int value (_op1^.isintvalue=true) }
constructor op_ref_ref(op : tasmop;_size : topsize;_op1,_op2 : preference);
constructor op_reg_reg_reg(op : tasmop;_size : topsize;_op1,_op2,_op3 : tregister);
constructor op_const_reg_reg(op : tasmop;_size : topsize;_op1 : longint;_op2 : tregister;_op3 : tregister);
constructor op_const_ref_reg(op : tasmop;_size : topsize;_op1 : longint;_op2 : preference;_op3 : tregister);
constructor op_reg_reg_ref(op : tasmop;_size : topsize;_op1,_op2 : tregister; _op3 : preference);
constructor op_const_reg_ref(op : tasmop;_size : topsize;_op1 : longint;_op2 : tregister;_op3 : preference);
{ this is for Jmp instructions }
constructor op_cond_sym(op : tasmop;cond:TAsmCond;_size : topsize;_op1 : pasmsymbol);
constructor op_sym(op : tasmop;_size : topsize;_op1 : pasmsymbol);
constructor op_sym_ofs(op : tasmop;_size : topsize;_op1 : pasmsymbol;_op1ofs:longint);
constructor op_sym_ofs_reg(op : tasmop;_size : topsize;_op1 : pasmsymbol;_op1ofs:longint;_op2 : tregister);
constructor op_sym_ofs_ref(op : tasmop;_size : topsize;_op1 : pasmsymbol;_op1ofs:longint;_op2 : preference);
procedure loadconst(opidx:longint;l:longint);
procedure loadsymbol(opidx:longint;s:pasmsymbol;sofs:longint);
procedure loadref(opidx:longint;p:preference);
procedure loadreg(opidx:longint;r:tregister);
procedure loadoper(opidx:longint;o:toper);
procedure changeopsize(siz:topsize);
procedure SetCondition(c:TAsmCond);
destructor destroy;override;
function getcopy:tlinkedlistitem;override;
function GetString:string;
procedure SwapOperands;
procedure CheckNonCommutativeOpcodes;
private
segprefix : tregister;
procedure init(op : tasmop;_size : topsize); { this need to be called by all constructor }
{$ifndef NOAG386BIN}
public
{ the next will reset all instructions that can change in pass 2 }
procedure ResetPass2;
function CheckIfValid:boolean;
function Pass1(offset:longint):longint;virtual;
procedure Pass2;virtual;
private
{ next fields are filled in pass1, so pass2 is faster }
insentry : PInsEntry;
insoffset,
inssize : longint;
LastInsOffset : longint; { need to be public to be reset }
function InsEnd:longint;
procedure create_ot;
function Matches(p:PInsEntry):longint;
function calcsize(p:PInsEntry):longint;
procedure gencode;
function NeedAddrPrefix(opidx:byte):boolean;
{$endif NOAG386BIN}
end;
implementation
uses
cutils,
ogbase;
{*****************************************************************************
TaiRegAlloc
*****************************************************************************}
constructor tairegalloc.alloc(r : tregister);
begin
inherited create;
typ:=ait_regalloc;
allocation:=true;
reg:=r;
end;
constructor tairegalloc.dealloc(r : tregister);
begin
inherited create;
typ:=ait_regalloc;
allocation:=false;
reg:=r;
end;
{****************************************************************************
TAI_ALIGN
****************************************************************************}
constructor tai_align.create(b: byte);
begin
inherited create(b);
reg := R_ECX;
end;
constructor tai_align.create_op(b: byte; _op: byte);
begin
inherited create_op(b,_op);
reg := R_NO;
end;
function tai_align.getfillbuf:pchar;
const
alignarray:array[0..5] of string[8]=(
#$8D#$B4#$26#$00#$00#$00#$00,
#$8D#$B6#$00#$00#$00#$00,
#$8D#$74#$26#$00,
#$8D#$76#$00,
#$89#$F6,
#$90
);
var
bufptr : pchar;
j : longint;
begin
if not use_op then
begin
bufptr:=@buf;
while (fillsize>0) do
begin
for j:=0 to 5 do
if (fillsize>=length(alignarray[j])) then
break;
move(alignarray[j][1],bufptr^,length(alignarray[j]));
inc(bufptr,length(alignarray[j]));
dec(fillsize,length(alignarray[j]));
end;
end;
getfillbuf:=pchar(@buf);
end;
{*****************************************************************************
Taicpu Constructors
*****************************************************************************}
procedure taicpu.loadconst(opidx:longint;l:longint);
begin
if opidx>=ops then
ops:=opidx+1;
with oper[opidx] do
begin
if typ=top_ref then
disposereference(ref);
val:=l;
typ:=top_const;
end;
end;
procedure taicpu.loadsymbol(opidx:longint;s:pasmsymbol;sofs:longint);
begin
if opidx>=ops then
ops:=opidx+1;
with oper[opidx] do
begin
if typ=top_ref then
disposereference(ref);
sym:=s;
symofs:=sofs;
typ:=top_symbol;
end;
{ Mark the symbol as used }
if assigned(s) then
inc(s^.refs);
end;
procedure taicpu.loadref(opidx:longint;p:preference);
begin
if opidx>=ops then
ops:=opidx+1;
with oper[opidx] do
begin
if typ=top_ref then
disposereference(ref);
if p^.is_immediate then
begin
{$ifdef REF_IMMEDIATE_WARN}
Comment(V_Warning,'Reference immediate');
{$endif}
val:=p^.offset;
disposereference(p);
typ:=top_const;
end
else
begin
ref:=p;
if not(ref^.segment in [R_DS,R_NO]) then
segprefix:=ref^.segment;
typ:=top_ref;
{ mark symbol as used }
if assigned(ref^.symbol) then
inc(ref^.symbol^.refs);
end;
end;
end;
procedure taicpu.loadreg(opidx:longint;r:tregister);
begin
if opidx>=ops then
ops:=opidx+1;
with oper[opidx] do
begin
if typ=top_ref then
disposereference(ref);
reg:=r;
typ:=top_reg;
end;
end;
procedure taicpu.loadoper(opidx:longint;o:toper);
begin
if opidx>=ops then
ops:=opidx+1;
if oper[opidx].typ=top_ref then
disposereference(oper[opidx].ref);
oper[opidx]:=o;
{ copy also the reference }
if oper[opidx].typ=top_ref then
oper[opidx].ref:=newreference(o.ref^);
end;
procedure taicpu.changeopsize(siz:topsize);
begin
opsize:=siz;
end;
procedure taicpu.init(op : tasmop;_size : topsize);
begin
typ:=ait_instruction;
is_jmp:=false;
segprefix:=R_NO;
opcode:=op;
opsize:=_size;
ops:=0;
condition:=c_none;
fillchar(oper,sizeof(oper),0);
{$ifndef NOAG386BIN}
insentry:=nil;
LastInsOffset:=-1;
InsOffset:=0;
InsSize:=0;
{$endif}
end;
constructor taicpu.op_none(op : tasmop;_size : topsize);
begin
inherited create;
init(op,_size);
end;
constructor taicpu.op_reg(op : tasmop;_size : topsize;_op1 : tregister);
begin
inherited create;
init(op,_size);
ops:=1;
loadreg(0,_op1);
end;
constructor taicpu.op_const(op : tasmop;_size : topsize;_op1 : longint);
begin
inherited create;
init(op,_size);
ops:=1;
loadconst(0,_op1);
end;
constructor taicpu.op_ref(op : tasmop;_size : topsize;_op1 : preference);
begin
inherited create;
init(op,_size);
ops:=1;
loadref(0,_op1);
end;
constructor taicpu.op_reg_reg(op : tasmop;_size : topsize;_op1,_op2 : tregister);
begin
inherited create;
init(op,_size);
ops:=2;
loadreg(0,_op1);
loadreg(1,_op2);
end;
constructor taicpu.op_reg_const(op:tasmop; _size: topsize; _op1: tregister; _op2: longint);
begin
inherited create;
init(op,_size);
ops:=2;
loadreg(0,_op1);
loadconst(1,_op2);
end;
constructor taicpu.op_reg_ref(op : tasmop;_size : topsize;_op1 : tregister;_op2 : preference);
begin
inherited create;
init(op,_size);
ops:=2;
loadreg(0,_op1);
loadref(1,_op2);
end;
constructor taicpu.op_const_reg(op : tasmop;_size : topsize;_op1 : longint;_op2 : tregister);
begin
inherited create;
init(op,_size);
ops:=2;
loadconst(0,_op1);
loadreg(1,_op2);
end;
constructor taicpu.op_const_const(op : tasmop;_size : topsize;_op1,_op2 : longint);
begin
inherited create;
init(op,_size);
ops:=2;
loadconst(0,_op1);
loadconst(1,_op2);
end;
constructor taicpu.op_const_ref(op : tasmop;_size : topsize;_op1 : longint;_op2 : preference);
begin
inherited create;
init(op,_size);
ops:=2;
loadconst(0,_op1);
loadref(1,_op2);
end;
constructor taicpu.op_ref_reg(op : tasmop;_size : topsize;_op1 : preference;_op2 : tregister);
begin
inherited create;
init(op,_size);
ops:=2;
loadref(0,_op1);
loadreg(1,_op2);
end;
constructor taicpu.op_ref_ref(op : tasmop;_size : topsize;_op1,_op2 : preference);
begin
inherited create;
init(op,_size);
ops:=2;
loadref(0,_op1);
loadref(1,_op2);
end;
constructor taicpu.op_reg_reg_reg(op : tasmop;_size : topsize;_op1,_op2,_op3 : tregister);
begin
inherited create;
init(op,_size);
ops:=3;
loadreg(0,_op1);
loadreg(1,_op2);
loadreg(2,_op3);
end;
constructor taicpu.op_const_reg_reg(op : tasmop;_size : topsize;_op1 : longint;_op2 : tregister;_op3 : tregister);
begin
inherited create;
init(op,_size);
ops:=3;
loadconst(0,_op1);
loadreg(1,_op2);
loadreg(2,_op3);
end;
constructor taicpu.op_reg_reg_ref(op : tasmop;_size : topsize;_op1,_op2 : tregister;_op3 : preference);
begin
inherited create;
init(op,_size);
ops:=3;
loadreg(0,_op1);
loadreg(1,_op2);
loadref(2,_op3);
end;
constructor taicpu.op_const_ref_reg(op : tasmop;_size : topsize;_op1 : longint;_op2 : preference;_op3 : tregister);
begin
inherited create;
init(op,_size);
ops:=3;
loadconst(0,_op1);
loadref(1,_op2);
loadreg(2,_op3);
end;
constructor taicpu.op_const_reg_ref(op : tasmop;_size : topsize;_op1 : longint;_op2 : tregister;_op3 : preference);
begin
inherited create;
init(op,_size);
ops:=3;
loadconst(0,_op1);
loadreg(1,_op2);
loadref(2,_op3);
end;
constructor taicpu.op_cond_sym(op : tasmop;cond:TAsmCond;_size : topsize;_op1 : pasmsymbol);
begin
inherited create;
init(op,_size);
condition:=cond;
ops:=1;
loadsymbol(0,_op1,0);
end;
constructor taicpu.op_sym(op : tasmop;_size : topsize;_op1 : pasmsymbol);
begin
inherited create;
init(op,_size);
ops:=1;
loadsymbol(0,_op1,0);
end;
constructor taicpu.op_sym_ofs(op : tasmop;_size : topsize;_op1 : pasmsymbol;_op1ofs:longint);
begin
inherited create;
init(op,_size);
ops:=1;
loadsymbol(0,_op1,_op1ofs);
end;
constructor taicpu.op_sym_ofs_reg(op : tasmop;_size : topsize;_op1 : pasmsymbol;_op1ofs:longint;_op2 : tregister);
begin
inherited create;
init(op,_size);
ops:=2;
loadsymbol(0,_op1,_op1ofs);
loadreg(1,_op2);
end;
constructor taicpu.op_sym_ofs_ref(op : tasmop;_size : topsize;_op1 : pasmsymbol;_op1ofs:longint;_op2 : preference);
begin
inherited create;
init(op,_size);
ops:=2;
loadsymbol(0,_op1,_op1ofs);
loadref(1,_op2);
end;
destructor taicpu.destroy;
begin
{ unrolled for speed }
if (ops>0) then
begin
case oper[0].typ of
top_ref:
dispose(oper[0].ref);
top_symbol:
dec(Pasmsymbol(oper[0].sym)^.refs);
end;
if (ops>1) then
begin
if (oper[1].typ=top_ref) then
dispose(oper[1].ref);
if (ops>2) and (oper[2].typ=top_ref) then
dispose(oper[2].ref);
end;
end;
inherited destroy;
end;
function taicpu.getcopy:tlinkedlistitem;
var
p : taicpu;
begin
p:=taicpu(inherited getcopy);
{ make a copy of the references, unrolled for speed }
if ops>0 then
begin
if (p.oper[0].typ=top_ref) then
begin
new(p.oper[0].ref);
p.oper[0].ref^:=oper[0].ref^;
end;
if ops>1 then
begin
if (p.oper[1].typ=top_ref) then
begin
new(p.oper[1].ref);
p.oper[1].ref^:=oper[1].ref^;
end;
if (ops>2) and (p.oper[2].typ=top_ref) then
begin
new(p.oper[2].ref);
p.oper[2].ref^:=oper[2].ref^;
end;
end;
end;
getcopy:=p;
end;
procedure taicpu.SetCondition(c:TAsmCond);
begin
condition:=c;
end;
function taicpu.GetString:string;
var
i : longint;
s : string;
addsize : boolean;
begin
s:='['+int_op2str[opcode];
for i:=1to ops do
begin
if i=1 then
s:=s+' '
else
s:=s+',';
{ type }
addsize:=false;
if (oper[i-1].ot and OT_XMMREG)=OT_XMMREG then
s:=s+'xmmreg'
else
if (oper[i-1].ot and OT_MMXREG)=OT_MMXREG then
s:=s+'mmxreg'
else
if (oper[i-1].ot and OT_FPUREG)=OT_FPUREG then
s:=s+'fpureg'
else
if (oper[i-1].ot and OT_REGISTER)=OT_REGISTER then
begin
s:=s+'reg';
addsize:=true;
end
else
if (oper[i-1].ot and OT_IMMEDIATE)=OT_IMMEDIATE then
begin
s:=s+'imm';
addsize:=true;
end
else
if (oper[i-1].ot and OT_MEMORY)=OT_MEMORY then
begin
s:=s+'mem';
addsize:=true;
end
else
s:=s+'???';
{ size }
if addsize then
begin
if (oper[i-1].ot and OT_BITS8)<>0 then
s:=s+'8'
else
if (oper[i-1].ot and OT_BITS16)<>0 then
s:=s+'16'
else
if (oper[i-1].ot and OT_BITS32)<>0 then
s:=s+'32'
else
s:=s+'??';
{ signed }
if (oper[i-1].ot and OT_SIGNED)<>0 then
s:=s+'s';
end;
end;
GetString:=s+']';
end;
procedure taicpu.SwapOperands;
var
p : TOper;
begin
{ Fix the operands which are in AT&T style and we need them in Intel style }
case ops of
2 : begin
{ 0,1 -> 1,0 }
p:=oper[0];
oper[0]:=oper[1];
oper[1]:=p;
end;
3 : begin
{ 0,1,2 -> 2,1,0 }
p:=oper[0];
oper[0]:=oper[2];
oper[2]:=p;
end;
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 taicpu.CheckNonCommutativeOpcodes;
begin
if ((ops=2) and
(oper[0].typ=top_reg) and
(oper[1].typ=top_reg) and
{ if the first is ST and the second is also a register
it is necessarily ST1 .. ST7 }
(oper[0].reg=R_ST)) or
((ops=1) and
(oper[0].typ=top_reg) and
(oper[0].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;
{*****************************************************************************
Assembler
*****************************************************************************}
{$ifndef NOAG386BIN}
type
ea=packed record
sib_present : boolean;
bytes : byte;
size : byte;
modrm : byte;
sib : byte;
end;
procedure taicpu.create_ot;
{
this function will also fix some other fields which only needs to be once
}
var
i,l,relsize : longint;
begin
if ops=0 then
exit;
{ update oper[].ot field }
for i:=0 to ops-1 do
with oper[i] do
begin
case typ of
top_reg :
ot:=reg_2_type[reg];
top_ref :
begin
{ create ot field }
ot:=OT_MEMORY or opsize_2_type[i,opsize];
if (ref^.base=R_NO) and (ref^.index=R_NO) then
ot:=ot or OT_MEM_OFFS;
{ handle also the offsetfixup }
inc(ref^.offset,ref^.offsetfixup);
ref^.offsetfixup:=0;
{ fix scalefactor }
if (ref^.index=R_NO) then
ref^.scalefactor:=0
else
if (ref^.scalefactor=0) then
ref^.scalefactor:=1;
end;
top_const :
begin
if (opsize<>S_W) and (val>=-128) and (val<=127) then
ot:=OT_IMM8 or OT_SIGNED
else
ot:=OT_IMMEDIATE or opsize_2_type[i,opsize];
end;
top_symbol :
begin
if LastInsOffset=-1 then
l:=0
else
l:=InsOffset-LastInsOffset;
inc(l,symofs);
if assigned(sym) then
inc(l,sym^.address);
{ instruction size will then always become 2 (PFV) }
relsize:=(InsOffset+2)-l;
if (not assigned(sym) or
((sym^.bind<>AB_EXTERNAL) and (sym^.address<>0))) and
(relsize>=-128) and (relsize<=127) then
ot:=OT_IMM32 or OT_SHORT
else
ot:=OT_IMM32 or OT_NEAR;
end;
end;
end;
end;
function taicpu.InsEnd:longint;
begin
InsEnd:=InsOffset+InsSize;
end;
function taicpu.Matches(p:PInsEntry):longint;
{ * IF_SM stands for Size Match: any operand whose size is not
* explicitly specified by the template is `really' intended to be
* the same size as the first size-specified operand.
* Non-specification is tolerated in the input instruction, but
* _wrong_ specification is not.
*
* IF_SM2 invokes Size Match on only the first _two_ operands, for
* three-operand instructions such as SHLD: it implies that the
* first two operands must match in size, but that the third is
* required to be _unspecified_.
*
* IF_SB invokes Size Byte: operands with unspecified size in the
* template are really bytes, and so no non-byte specification in
* the input instruction will be tolerated. IF_SW similarly invokes
* Size Word, and IF_SD invokes Size Doubleword.
*
* (The default state if neither IF_SM nor IF_SM2 is specified is
* that any operand with unspecified size in the template is
* required to have unspecified size in the instruction too...)
}
var
i,j,asize,oprs : longint;
siz : array[0..2] of longint;
begin
Matches:=100;
{ Check the opcode and operands }
if (p^.opcode<>opcode) or (p^.ops<>ops) then
begin
Matches:=0;
exit;
end;
{ Check that no spurious colons or TOs are present }
for i:=0 to p^.ops-1 do
if (oper[i].ot and (not p^.optypes[i]) and (OT_COLON or OT_TO))<>0 then
begin
Matches:=0;
exit;
end;
{ Check that the operand flags all match up }
for i:=0 to p^.ops-1 do
begin
if (p^.optypes[i] and (not oper[i].ot) or
((p^.optypes[i] and OT_SIZE_MASK) and
((p^.optypes[i] xor oper[i].ot) and OT_SIZE_MASK)))<>0 then
begin
if ((p^.optypes[i] and (not oper[i].ot) and OT_NON_SIZE) or
(oper[i].ot and OT_SIZE_MASK))<>0 then
begin
Matches:=0;
exit;
end
else
Matches:=1;
end;
end;
{ Check operand sizes }
{ as default an untyped size can get all the sizes, this is different
from nasm, but else we need to do a lot checking which opcodes want
size or not with the automatic size generation }
asize:=longint($ffffffff);
if (p^.flags and IF_SB)<>0 then
asize:=OT_BITS8
else if (p^.flags and IF_SW)<>0 then
asize:=OT_BITS16
else if (p^.flags and IF_SD)<>0 then
asize:=OT_BITS32;
if (p^.flags and IF_ARMASK)<>0 then
begin
siz[0]:=0;
siz[1]:=0;
siz[2]:=0;
if (p^.flags and IF_AR0)<>0 then
siz[0]:=asize
else if (p^.flags and IF_AR1)<>0 then
siz[1]:=asize
else if (p^.flags and IF_AR2)<>0 then
siz[2]:=asize;
end
else
begin
{ siz[0]:=asize;
siz[1]:=asize;
siz[2]:=asize; }
{ we can leave because the size for all operands is forced to be
the same }
exit;
end;
if (p^.flags and (IF_SM or IF_SM2))<>0 then
begin
if (p^.flags and IF_SM2)<>0 then
oprs:=2
else
oprs:=p^.ops;
for i:=0 to oprs-1 do
if ((p^.optypes[i] and OT_SIZE_MASK) <> 0) then
begin
for j:=0 to oprs-1 do
siz[j]:=p^.optypes[i] and OT_SIZE_MASK;
break;
end;
end
else
oprs:=2;
{ Check operand sizes }
for i:=0 to p^.ops-1 do
begin
if ((p^.optypes[i] and OT_SIZE_MASK)=0) and
((oper[i].ot and OT_SIZE_MASK and (not siz[i]))<>0) and
{ Immediates can always include smaller size }
((oper[i].ot and OT_IMMEDIATE)=0) and
(((p^.optypes[i] and OT_SIZE_MASK) or siz[i])<(oper[i].ot and OT_SIZE_MASK)) then
Matches:=2;
end;
end;
procedure taicpu.ResetPass2;
begin
{ we are here in a second pass, check if the instruction can be optimized }
if assigned(InsEntry) and
((InsEntry^.flags and IF_PASS2)<>0) then
begin
InsEntry:=nil;
InsSize:=0;
end;
LastInsOffset:=-1;
end;
function taicpu.CheckIfValid:boolean;
var
m,i : longint;
begin
CheckIfValid:=false;
{ Things which may only be done once, not when a second pass is done to
optimize }
if Insentry=nil then
begin
{ We need intel style operands }
SwapOperands;
{ create the .ot fields }
create_ot;
{ set the file postion }
aktfilepos:=fileinfo;
end
else
begin
{ we've already an insentry so it's valid }
CheckIfValid:=true;
exit;
end;
{ Lookup opcode in the table }
InsSize:=-1;
i:=instabcache^[opcode];
if i=-1 then
begin
{$ifdef TP}
Message1(asmw_e_opcode_not_in_table,'');
{$else}
Message1(asmw_e_opcode_not_in_table,att_op2str[opcode]);
{$endif}
exit;
end;
insentry:=@instab[i];
while (insentry^.opcode=opcode) do
begin
m:=matches(insentry);
if m=100 then
begin
InsSize:=calcsize(insentry);
if (segprefix<>R_NO) then
inc(InsSize);
CheckIfValid:=true;
exit;
end;
inc(i);
insentry:=@instab[i];
end;
if insentry^.opcode<>opcode then
Message1(asmw_e_invalid_opcode_and_operands,GetString);
{ No instruction found, set insentry to nil and inssize to -1 }
insentry:=nil;
inssize:=-1;
end;
function taicpu.Pass1(offset:longint):longint;
begin
Pass1:=0;
{ Save the old offset and set the new offset }
InsOffset:=Offset;
{ Things which may only be done once, not when a second pass is done to
optimize }
if Insentry=nil then
begin
{ Check if error last time then InsSize=-1 }
if InsSize=-1 then
exit;
{ set the file postion }
aktfilepos:=fileinfo;
end
else
begin
{$ifdef PASS2FLAG}
{ we are here in a second pass, check if the instruction can be optimized }
if (InsEntry^.flags and IF_PASS2)=0 then
begin
Pass1:=InsSize;
exit;
end;
{ update the .ot fields, some top_const can be updated }
create_ot;
{$endif}
end;
{ Check if it's a valid instruction }
if CheckIfValid then
begin
LastInsOffset:=InsOffset;
Pass1:=InsSize;
exit;
end;
LastInsOffset:=-1;
end;
procedure taicpu.Pass2;
var
c : longint;
begin
{ error in pass1 ? }
if insentry=nil then
exit;
aktfilepos:=fileinfo;
{ Segment override }
if (segprefix<>R_NO) then
begin
case segprefix of
R_CS : c:=$2e;
R_DS : c:=$3e;
R_ES : c:=$26;
R_FS : c:=$64;
R_GS : c:=$65;
R_SS : c:=$36;
end;
objectdata.writebytes(c,1);
{ fix the offset for GenNode }
inc(InsOffset);
end;
{ Generate the instruction }
GenCode;
end;
function taicpu.NeedAddrPrefix(opidx:byte):boolean;
var
i,b : tregister;
begin
if (OT_MEMORY and (not oper[opidx].ot))=0 then
begin
i:=oper[opidx].ref^.index;
b:=oper[opidx].ref^.base;
if not(i in [R_NO,R_EAX,R_EBX,R_ECX,R_EDX,R_EBP,R_ESP,R_ESI,R_EDI]) or
not(b in [R_NO,R_EAX,R_EBX,R_ECX,R_EDX,R_EBP,R_ESP,R_ESI,R_EDI]) then
begin
NeedAddrPrefix:=true;
exit;
end;
end;
NeedAddrPrefix:=false;
end;
function regval(r:tregister):byte;
begin
case r of
R_EAX,R_AX,R_AL,R_ES,R_CR0,R_DR0,R_ST,R_ST0,R_MM0,R_XMM0 :
regval:=0;
R_ECX,R_CX,R_CL,R_CS,R_DR1,R_ST1,R_MM1,R_XMM1 :
regval:=1;
R_EDX,R_DX,R_DL,R_SS,R_CR2,R_DR2,R_ST2,R_MM2,R_XMM2 :
regval:=2;
R_EBX,R_BX,R_BL,R_DS,R_CR3,R_DR3,R_TR3,R_ST3,R_MM3,R_XMM3 :
regval:=3;
R_ESP,R_SP,R_AH,R_FS,R_CR4,R_TR4,R_ST4,R_MM4,R_XMM4 :
regval:=4;
R_EBP,R_BP,R_CH,R_GS,R_TR5,R_ST5,R_MM5,R_XMM5 :
regval:=5;
R_ESI,R_SI,R_DH,R_DR6,R_TR6,R_ST6,R_MM6,R_XMM6 :
regval:=6;
R_EDI,R_DI,R_BH,R_DR7,R_TR7,R_ST7,R_MM7,R_XMM7 :
regval:=7;
else
begin
internalerror(777001);
regval:=0;
end;
end;
end;
function process_ea(const input:toper;var output:ea;rfield:longint):boolean;
const
regs : array[0..63] of tregister=(
R_MM0, R_EAX, R_AX, R_AL, R_XMM0, R_NO, R_NO, R_NO,
R_MM1, R_ECX, R_CX, R_CL, R_XMM1, R_NO, R_NO, R_NO,
R_MM2, R_EDX, R_DX, R_DL, R_XMM2, R_NO, R_NO, R_NO,
R_MM3, R_EBX, R_BX, R_BL, R_XMM3, R_NO, R_NO, R_NO,
R_MM4, R_ESP, R_SP, R_AH, R_XMM4, R_NO, R_NO, R_NO,
R_MM5, R_EBP, R_BP, R_CH, R_XMM5, R_NO, R_NO, R_NO,
R_MM6, R_ESI, R_SI, R_DH, R_XMM6, R_NO, R_NO, R_NO,
R_MM7, R_EDI, R_DI, R_BH, R_XMM7, R_NO, R_NO, R_NO
);
var
j : longint;
i,b : tregister;
sym : pasmsymbol;
md,s : byte;
base,index,scalefactor,
o : longint;
begin
process_ea:=false;
{ register ? }
if (input.typ=top_reg) then
begin
j:=0;
while (j<=high(regs)) do
begin
if input.reg=regs[j] then
break;
inc(j);
end;
if j<=high(regs) then
begin
output.sib_present:=false;
output.bytes:=0;
output.modrm:=$c0 or (rfield shl 3) or (j shr 3);
output.size:=1;
process_ea:=true;
end;
exit;
end;
{ memory reference }
i:=input.ref^.index;
b:=input.ref^.base;
s:=input.ref^.scalefactor;
o:=input.ref^.offset;
sym:=input.ref^.symbol;
{ it's direct address }
if (b=R_NO) and (i=R_NO) then
begin
{ it's a pure offset }
output.sib_present:=false;
output.bytes:=4;
output.modrm:=5 or (rfield shl 3);
end
else
{ it's an indirection }
begin
{ 16 bit address? }
if not((i in [R_NO,R_EAX,R_EBX,R_ECX,R_EDX,R_EBP,R_ESP,R_ESI,R_EDI]) and
(b in [R_NO,R_EAX,R_EBX,R_ECX,R_EDX,R_EBP,R_ESP,R_ESI,R_EDI])) then
Message(asmw_e_16bit_not_supported);
{$ifdef OPTEA}
{ make single reg base }
if (b=R_NO) and (s=1) then
begin
b:=i;
i:=R_NO;
end;
{ convert [3,5,9]*EAX to EAX+[2,4,8]*EAX }
if (b=R_NO) and
(((s=2) and (i<>R_ESP)) or
(s=3) or (s=5) or (s=9)) then
begin
b:=i;
dec(s);
end;
{ swap ESP into base if scalefactor is 1 }
if (s=1) and (i=R_ESP) then
begin
i:=b;
b:=R_ESP;
end;
{$endif}
{ wrong, for various reasons }
if (i=R_ESP) or ((s<>1) and (s<>2) and (s<>4) and (s<>8) and (i<>R_NO)) then
exit;
{ base }
case b of
R_EAX : base:=0;
R_ECX : base:=1;
R_EDX : base:=2;
R_EBX : base:=3;
R_ESP : base:=4;
R_NO,
R_EBP : base:=5;
R_ESI : base:=6;
R_EDI : base:=7;
else
exit;
end;
{ index }
case i of
R_EAX : index:=0;
R_ECX : index:=1;
R_EDX : index:=2;
R_EBX : index:=3;
R_NO : index:=4;
R_EBP : index:=5;
R_ESI : index:=6;
R_EDI : index:=7;
else
exit;
end;
case s of
0,
1 : scalefactor:=0;
2 : scalefactor:=1;
4 : scalefactor:=2;
8 : scalefactor:=3;
else
exit;
end;
if (b=R_NO) or
((b<>R_EBP) and (o=0) and (sym=nil)) then
md:=0
else
if ((o>=-128) and (o<=127) and (sym=nil)) then
md:=1
else
md:=2;
if (b=R_NO) or (md=2) then
output.bytes:=4
else
output.bytes:=md;
{ SIB needed ? }
if (i=R_NO) and (b<>R_ESP) then
begin
output.sib_present:=false;
output.modrm:=(md shl 6) or (rfield shl 3) or base;
end
else
begin
output.sib_present:=true;
output.modrm:=(md shl 6) or (rfield shl 3) or 4;
output.sib:=(scalefactor shl 6) or (index shl 3) or base;
end;
end;
if output.sib_present then
output.size:=2+output.bytes
else
output.size:=1+output.bytes;
process_ea:=true;
end;
function taicpu.calcsize(p:PInsEntry):longint;
var
codes : pchar;
c : byte;
len : longint;
ea_data : ea;
begin
len:=0;
codes:=@p^.code;
repeat
c:=ord(codes^);
inc(codes);
case c of
0 :
break;
1,2,3 :
begin
inc(codes,c);
inc(len,c);
end;
8,9,10 :
begin
inc(codes);
inc(len);
end;
4,5,6,7 :
begin
if opsize=S_W then
inc(len,2)
else
inc(len);
end;
15,
12,13,14,
16,17,18,
20,21,22,
40,41,42 :
inc(len);
24,25,26,
31,
48,49,50 :
inc(len,2);
28,29,30, { we don't have 16 bit immediates code }
32,33,34,
52,53,54,
56,57,58 :
inc(len,4);
192,193,194 :
if NeedAddrPrefix(c-192) then
inc(len);
208 :
inc(len);
200,
201,
202,
209,
210,
217,218,219 : ;
216 :
begin
inc(codes);
inc(len);
end;
224,225,226 :
begin
InternalError(777002);
end;
else
begin
if (c>=64) and (c<=191) then
begin
if not process_ea(oper[(c shr 3) and 7], ea_data, 0) then
Message(asmw_e_invalid_effective_address)
else
inc(len,ea_data.size);
end
else
InternalError(777003);
end;
end;
until false;
calcsize:=len;
end;
procedure taicpu.GenCode;
{
* the actual codes (C syntax, i.e. octal):
* \0 - terminates the code. (Unless it's a literal of course.)
* \1, \2, \3 - that many literal bytes follow in the code stream
* \4, \6 - the POP/PUSH (respectively) codes for CS, DS, ES, SS
* (POP is never used for CS) depending on operand 0
* \5, \7 - the second byte of POP/PUSH codes for FS, GS, depending
* on operand 0
* \10, \11, \12 - a literal byte follows in the code stream, to be added
* to the register value of operand 0, 1 or 2
* \17 - encodes the literal byte 0. (Some compilers don't take
* kindly to a zero byte in the _middle_ of a compile time
* string constant, so I had to put this hack in.)
* \14, \15, \16 - a signed byte immediate operand, from operand 0, 1 or 2
* \20, \21, \22 - a byte immediate operand, from operand 0, 1 or 2
* \24, \25, \26 - an unsigned byte immediate operand, from operand 0, 1 or 2
* \30, \31, \32 - a word immediate operand, from operand 0, 1 or 2
* \34, \35, \36 - select between \3[012] and \4[012] depending on 16/32 bit
* assembly mode or the address-size override on the operand
* \37 - a word constant, from the _segment_ part of operand 0
* \40, \41, \42 - a long immediate operand, from operand 0, 1 or 2
* \50, \51, \52 - a byte relative operand, from operand 0, 1 or 2
* \60, \61, \62 - a word relative operand, from operand 0, 1 or 2
* \64, \65, \66 - select between \6[012] and \7[012] depending on 16/32 bit
* assembly mode or the address-size override on the operand
* \70, \71, \72 - a long relative operand, from operand 0, 1 or 2
* \1ab - a ModRM, calculated on EA in operand a, with the spare
* field the register value of operand b.
* \2ab - a ModRM, calculated on EA in operand a, with the spare
* field equal to digit b.
* \30x - might be an 0x67 byte, depending on the address size of
* the memory reference in operand x.
* \310 - indicates fixed 16-bit address size, i.e. optional 0x67.
* \311 - indicates fixed 32-bit address size, i.e. optional 0x67.
* \320 - indicates fixed 16-bit operand size, i.e. optional 0x66.
* \321 - indicates fixed 32-bit operand size, i.e. optional 0x66.
* \322 - indicates that this instruction is only valid when the
* operand size is the default (instruction to disassembler,
* generates no code in the assembler)
* \330 - a literal byte follows in the code stream, to be added
* to the condition code value of the instruction.
* \340 - reserve <operand 0> bytes of uninitialised storage.
* Operand 0 had better be a segmentless constant.
}
var
currval : longint;
currsym : pasmsymbol;
procedure getvalsym(opidx:longint);
begin
case oper[opidx].typ of
top_ref :
begin
currval:=oper[opidx].ref^.offset;
currsym:=oper[opidx].ref^.symbol;
end;
top_const :
begin
currval:=oper[opidx].val;
currsym:=nil;
end;
top_symbol :
begin
currval:=oper[opidx].symofs;
currsym:=oper[opidx].sym;
end;
else
Message(asmw_e_immediate_or_reference_expected);
end;
end;
const
CondVal:array[TAsmCond] of byte=($0,
$7, $3, $2, $6, $2, $4, $F, $D, $C, $E, $6, $2,
$3, $7, $3, $5, $E, $C, $D, $F, $1, $B, $9, $5,
$0, $A, $A, $B, $8, $4);
var
c : byte;
pb,
codes : pchar;
bytes : array[0..3] of byte;
rfield,
data,s,opidx : longint;
ea_data : ea;
begin
codes:=insentry^.code;
{ Force word push/pop for registers }
if (opsize=S_W) and ((codes[0]=#4) or (codes[0]=#6) or
((codes[0]=#1) and ((codes[2]=#5) or (codes[2]=#7)))) then
begin
bytes[0]:=$66;
objectdata.writebytes(bytes,1);
end;
repeat
c:=ord(codes^);
inc(codes);
case c of
0 :
break;
1,2,3 :
begin
objectdata.writebytes(codes^,c);
inc(codes,c);
end;
4,6 :
begin
case oper[0].reg of
R_CS :
begin
if c=4 then
bytes[0]:=$f
else
bytes[0]:=$e;
end;
R_NO,
R_DS :
begin
if c=4 then
bytes[0]:=$1f
else
bytes[0]:=$1e;
end;
R_ES :
begin
if c=4 then
bytes[0]:=$7
else
bytes[0]:=$6;
end;
R_SS :
begin
if c=4 then
bytes[0]:=$17
else
bytes[0]:=$16;
end;
else
InternalError(777004);
end;
objectdata.writebytes(bytes,1);
end;
5,7 :
begin
case oper[0].reg of
R_FS :
begin
if c=5 then
bytes[0]:=$a1
else
bytes[0]:=$a0;
end;
R_GS :
begin
if c=5 then
bytes[0]:=$a9
else
bytes[0]:=$a8;
end;
else
InternalError(777005);
end;
objectdata.writebytes(bytes,1);
end;
8,9,10 :
begin
bytes[0]:=ord(codes^)+regval(oper[c-8].reg);
inc(codes);
objectdata.writebytes(bytes,1);
end;
15 :
begin
bytes[0]:=0;
objectdata.writebytes(bytes,1);
end;
12,13,14 :
begin
getvalsym(c-12);
if (currval<-128) or (currval>127) then
Message2(asmw_e_value_exceeds_bounds,'signed byte',tostr(currval));
if assigned(currsym) then
objectdata.writereloc(currval,1,currsym,relative_false)
else
objectdata.writebytes(currval,1);
end;
16,17,18 :
begin
getvalsym(c-16);
if (currval<-256) or (currval>255) then
Message2(asmw_e_value_exceeds_bounds,'byte',tostr(currval));
if assigned(currsym) then
objectdata.writereloc(currval,1,currsym,relative_false)
else
objectdata.writebytes(currval,1);
end;
20,21,22 :
begin
getvalsym(c-20);
if (currval<0) or (currval>255) then
Message2(asmw_e_value_exceeds_bounds,'unsigned byte',tostr(currval));
if assigned(currsym) then
objectdata.writereloc(currval,1,currsym,relative_false)
else
objectdata.writebytes(currval,1);
end;
24,25,26 :
begin
getvalsym(c-24);
if (currval<-65536) or (currval>65535) then
Message2(asmw_e_value_exceeds_bounds,'word',tostr(currval));
if assigned(currsym) then
objectdata.writereloc(currval,2,currsym,relative_false)
else
objectdata.writebytes(currval,2);
end;
28,29,30 :
begin
getvalsym(c-28);
if assigned(currsym) then
objectdata.writereloc(currval,4,currsym,relative_false)
else
objectdata.writebytes(currval,4);
end;
32,33,34 :
begin
getvalsym(c-32);
if assigned(currsym) then
objectdata.writereloc(currval,4,currsym,relative_false)
else
objectdata.writebytes(currval,4);
end;
40,41,42 :
begin
getvalsym(c-40);
data:=currval-insend;
if assigned(currsym) then
inc(data,currsym^.address);
if (data>127) or (data<-128) then
Message1(asmw_e_short_jmp_out_of_range,tostr(data));
objectdata.writebytes(data,1);
end;
52,53,54 :
begin
getvalsym(c-52);
if assigned(currsym) then
objectdata.writereloc(currval,4,currsym,relative_true)
else
objectdata.writereloc(currval-insend,4,nil,relative_false)
end;
56,57,58 :
begin
getvalsym(c-56);
if assigned(currsym) then
objectdata.writereloc(currval,4,currsym,relative_true)
else
objectdata.writereloc(currval-insend,4,nil,relative_false)
end;
192,193,194 :
begin
if NeedAddrPrefix(c-192) then
begin
bytes[0]:=$67;
objectdata.writebytes(bytes,1);
end;
end;
200 :
begin
bytes[0]:=$67;
objectdata.writebytes(bytes,1);
end;
208 :
begin
bytes[0]:=$66;
objectdata.writebytes(bytes,1);
end;
216 :
begin
bytes[0]:=ord(codes^)+condval[condition];
inc(codes);
objectdata.writebytes(bytes,1);
end;
201,
202,
209,
210,
217,218,219 :
begin
{ these are dissambler hints or 32 bit prefixes which
are not needed }
end;
31,
48,49,50,
224,225,226 :
begin
InternalError(777006);
end
else
begin
if (c>=64) and (c<=191) then
begin
if (c<127) then
begin
if (oper[c and 7].typ=top_reg) then
rfield:=regval(oper[c and 7].reg)
else
rfield:=regval(oper[c and 7].ref^.base);
end
else
rfield:=c and 7;
opidx:=(c shr 3) and 7;
if not process_ea(oper[opidx], ea_data, rfield) then
Message(asmw_e_invalid_effective_address);
pb:=@bytes;
pb^:=chr(ea_data.modrm);
inc(pb);
if ea_data.sib_present then
begin
pb^:=chr(ea_data.sib);
inc(pb);
end;
s:=pb-pchar(@bytes);
objectdata.writebytes(bytes,s);
case ea_data.bytes of
0 : ;
1 :
begin
if (oper[opidx].ot and OT_MEMORY)=OT_MEMORY then
objectdata.writereloc(oper[opidx].ref^.offset,1,oper[opidx].ref^.symbol,relative_false)
else
begin
bytes[0]:=oper[opidx].ref^.offset;
objectdata.writebytes(bytes,1);
end;
inc(s);
end;
2,4 :
begin
objectdata.writereloc(oper[opidx].ref^.offset,ea_data.bytes,
oper[opidx].ref^.symbol,relative_false);
inc(s,ea_data.bytes);
end;
end;
end
else
InternalError(777007);
end;
end;
until false;
end;
{$endif NOAG386BIN}
end.
{
$Log$
Revision 1.9 2001-01-12 19:18:42 peter
* check for valid asm instructions
Revision 1.8 2001/01/07 15:48:56 jonas
* references to symbols were only decreased in taicpu.done for jmps, fixed
Revision 1.7 2000/12/26 15:56:17 peter
* unrolled loops in taicpu.destroy
Revision 1.6 2000/12/25 00:07:31 peter
+ new tlinkedlist class (merge of old tstringqueue,tcontainer and
tlinkedlist objects)
Revision 1.5 2000/12/23 19:59:35 peter
* object to class for ow/og objects
* split objectdata from objectoutput
Revision 1.4 2000/12/07 17:19:45 jonas
* new constant handling: from now on, hex constants >$7fffffff are
parsed as unsigned constants (otherwise, $80000000 got sign extended
and became $ffffffff80000000), all constants in the longint range
become longints, all constants >$7fffffff and <=cardinal($ffffffff)
are cardinals and the rest are int64's.
* added lots of longint typecast to prevent range check errors in the
compiler and rtl
* type casts of symbolic ordinal constants are now preserved
* fixed bug where the original resulttype wasn't restored correctly
after doing a 64bit rangecheck
Revision 1.3 2000/11/12 22:20:37 peter
* create generic toutputsection for binary writers
Revision 1.2 2000/10/15 10:50:46 florian
* fixed xmm register access
Revision 1.1 2000/10/15 09:39:37 peter
* moved cpu*.pas to i386/
* renamed n386 to common cpunode
Revision 1.5 2000/09/24 15:06:14 peter
* use defines.inc
Revision 1.4 2000/08/27 16:11:50 peter
* moved some util functions from globals,cobjects to cutils
* splitted files into finput,fmodule
Revision 1.3 2000/07/13 12:08:25 michael
+ patched to 1.1.0 with former 1.09patch from peter
Revision 1.2 2000/07/13 11:32:38 michael
+ removed logs
}
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