fpc/compiler/i386/cpubase.pas

{
    $Id$
    Copyright (c) 1998-2000 by Florian Klaempfl and Peter Vreman

    Contains the base types 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 cpubase;

{$i defines.inc}

interface

uses
  globals,cutils,cclasses,aasm;

const
{ Size of the instruction table converted by nasmconv.pas }
  instabentries = {$i i386nop.inc}
  maxinfolen    = 8;

{ By default we want everything }
{$define ATTOP}
{$define ATTREG}
{$define INTELOP}
{$define ITTABLE}

{ We Don't need the intel style opcodes if we don't have a intel
  reader or generator }
{$ifdef NORA386INT}
  {$ifdef NOAG386NSM}
    {$ifdef NOAG386INT}
      {$undef INTELOP}
    {$endif}
  {$endif}
{$endif}

{ We Don't need the AT&T style opcodes if we don't have a AT&T
  reader or generator }
{$ifdef NORA386ATT}
  {$ifdef NOAG386ATT}
    {$undef ATTOP}
    {$ifdef NOAG386DIR}
       {$undef ATTREG}
    {$endif}
  {$endif}
{$endif}

{ We need the AT&T suffix table for both asm readers and AT&T writer }
{$define ATTSUF}
{$ifdef NORA386INT}
  {$ifdef NORA386ATT}
    {$ifdef NOAG386ATT}
      {$undef ATTSUF}
    {$endif}
  {$endif}
{$endif}

const
{ Operand types }
  OT_NONE      = $00000000;

  OT_BITS8     = $00000001;  { size, and other attributes, of the operand  }
  OT_BITS16    = $00000002;
  OT_BITS32    = $00000004;
  OT_BITS64    = $00000008;  { FPU only  }
  OT_BITS80    = $00000010;
  OT_FAR       = $00000020;  { this means 16:16 or 16:32, like in CALL/JMP }
  OT_NEAR      = $00000040;
  OT_SHORT     = $00000080;

  OT_SIZE_MASK = $000000FF;  { all the size attributes  }
  OT_NON_SIZE  = longint(not OT_SIZE_MASK);

  OT_SIGNED    = $00000100;  { the operand need to be signed -128-127 }

  OT_TO        = $00000200;  { operand is followed by a colon  }
                             { reverse effect in FADD, FSUB &c  }
  OT_COLON     = $00000400;

  OT_REGISTER  = $00001000;
  OT_IMMEDIATE = $00002000;
  OT_IMM8      = $00002001;
  OT_IMM16     = $00002002;
  OT_IMM32     = $00002004;
  OT_IMM64     = $00002008;
  OT_IMM80     = $00002010;
  OT_REGMEM    = $00200000;  { for r/m, ie EA, operands  }
  OT_REGNORM   = $00201000;  { 'normal' reg, qualifies as EA  }
  OT_REG8      = $00201001;
  OT_REG16     = $00201002;
  OT_REG32     = $00201004;
  OT_MMXREG    = $00201008;  { MMX registers  }
  OT_XMMREG    = $00201010;  { Katmai registers  }
  OT_MEMORY    = $00204000;  { register number in 'basereg'  }
  OT_MEM8      = $00204001;
  OT_MEM16     = $00204002;
  OT_MEM32     = $00204004;
  OT_MEM64     = $00204008;
  OT_MEM80     = $00204010;
  OT_FPUREG    = $01000000;  { floating point stack registers  }
  OT_FPU0      = $01000800;  { FPU stack register zero  }
  OT_REG_SMASK = $00070000;  { special register operands: these may be treated differently  }
                             { a mask for the following  }
  OT_REG_ACCUM = $00211000;  { accumulator: AL, AX or EAX  }
  OT_REG_AL    = $00211001;    { REG_ACCUM | BITSxx  }
  OT_REG_AX    = $00211002;    { ditto  }
  OT_REG_EAX   = $00211004;    { and again  }
  OT_REG_COUNT = $00221000;  { counter: CL, CX or ECX  }
  OT_REG_CL    = $00221001;    { REG_COUNT | BITSxx  }
  OT_REG_CX    = $00221002;    { ditto  }
  OT_REG_ECX   = $00221004;    { another one  }
  OT_REG_DX    = $00241002;

  OT_REG_SREG  = $00081002;  { any segment register  }
  OT_REG_CS    = $01081002;  { CS  }
  OT_REG_DESS  = $02081002;  { DS, ES, SS (non-CS 86 registers)  }
  OT_REG_FSGS  = $04081002;  { FS, GS (386 extended registers)  }

  OT_REG_CDT   = $00101004;  { CRn, DRn and TRn  }
  OT_REG_CREG  = $08101004;  { CRn  }
  OT_REG_CR4   = $08101404;  { CR4 (Pentium only)  }
  OT_REG_DREG  = $10101004;  { DRn  }
  OT_REG_TREG  = $20101004;  { TRn  }

  OT_MEM_OFFS  = $00604000;  { special type of EA  }
                             { simple [address] offset  }
  OT_ONENESS   = $00800000;  { special type of immediate operand  }
                             { so UNITY == IMMEDIATE | ONENESS  }
  OT_UNITY     = $00802000;  { for shift/rotate instructions  }

{Instruction flags }
  IF_NONE   = $00000000;
  IF_SM     = $00000001;        { size match first two operands  }
  IF_SM2    = $00000002;
  IF_SB     = $00000004;  { unsized operands can't be non-byte  }
  IF_SW     = $00000008;  { unsized operands can't be non-word  }
  IF_SD     = $00000010;  { unsized operands can't be nondword  }
  IF_AR0    = $00000020;  { SB, SW, SD applies to argument 0  }
  IF_AR1    = $00000040;  { SB, SW, SD applies to argument 1  }
  IF_AR2    = $00000060;  { SB, SW, SD applies to argument 2  }
  IF_ARMASK = $00000060;  { mask for unsized argument spec  }
  IF_PRIV   = $00000100;  { it's a privileged instruction  }
  IF_SMM    = $00000200;  { it's only valid in SMM  }
  IF_PROT   = $00000400;  { it's protected mode only  }
  IF_UNDOC  = $00001000;  { it's an undocumented instruction  }
  IF_FPU    = $00002000;  { it's an FPU instruction  }
  IF_MMX    = $00004000;  { it's an MMX instruction  }
  IF_3DNOW  = $00008000;  { it's a 3DNow! instruction  }
  IF_SSE    = $00010000;  { it's a SSE (KNI, MMX2) instruction  }
  IF_PMASK  =
     longint($FF000000);  { the mask for processor types  }
  IF_PFMASK =
     longint($F001FF00);  { the mask for disassembly "prefer"  }
  IF_8086   = $00000000;  { 8086 instruction  }
  IF_186    = $01000000;  { 186+ instruction  }
  IF_286    = $02000000;  { 286+ instruction  }
  IF_386    = $03000000;  { 386+ instruction  }
  IF_486    = $04000000;  { 486+ instruction  }
  IF_PENT   = $05000000;  { Pentium instruction  }
  IF_P6     = $06000000;  { P6 instruction  }
  IF_KATMAI = $07000000;  { Katmai instructions  }
  IF_CYRIX  = $10000000;  { Cyrix-specific instruction  }
  IF_AMD    = $20000000;  { AMD-specific instruction  }
  { added flags }
  IF_PRE    = $40000000;  { it's a prefix instruction }
  IF_PASS2  =
     longint($80000000);  { if the instruction can change in a second pass }

type
  TAttSuffix = (AttSufNONE,AttSufINT,AttSufFPU,AttSufFPUint);

  TAsmOp=
{$i i386op.inc}

  op2strtable=array[tasmop] of string[11];

  tstr2opentry = class(Tnamedindexitem)
    op: TAsmOp;
  end;

const
  firstop = low(tasmop);
  lastop  = high(tasmop);

  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
  );


{$ifdef INTELOP}
  int_op2str:op2strtable=
{$i i386int.inc}
{$endif INTELOP}

{$ifdef ATTOP}
  att_op2str:op2strtable=
{$i i386att.inc}
{$endif ATTOP}

{$ifdef ATTSUF}
  att_needsuffix:array[tasmop] of TAttSuffix=
{$i i386atts.inc}
{$endif ATTSUF}


{*****************************************************************************
                                Operand Sizes
*****************************************************************************}

type
  topsize = (S_NO,
    S_B,S_W,S_L,S_BW,S_BL,S_WL,
    S_IS,S_IL,S_IQ,
    S_FS,S_FL,S_FX,S_D,S_Q,S_FV,
    S_NEAR,S_FAR,S_SHORT
  );

const
  { Intel style operands ! }
  opsize_2_type:array[0..2,topsize] of longint=(
    (OT_NONE,
     OT_BITS8,OT_BITS16,OT_BITS32,OT_BITS16,OT_BITS32,OT_BITS32,
     OT_BITS16,OT_BITS32,OT_BITS64,
     OT_BITS32,OT_BITS64,OT_BITS80,OT_BITS64,OT_BITS64,OT_BITS64,
     OT_NEAR,OT_FAR,OT_SHORT
    ),
    (OT_NONE,
     OT_BITS8,OT_BITS16,OT_BITS32,OT_BITS8,OT_BITS8,OT_BITS16,
     OT_BITS16,OT_BITS32,OT_BITS64,
     OT_BITS32,OT_BITS64,OT_BITS80,OT_BITS64,OT_BITS64,OT_BITS64,
     OT_NEAR,OT_FAR,OT_SHORT
    ),
    (OT_NONE,
     OT_BITS8,OT_BITS16,OT_BITS32,OT_NONE,OT_NONE,OT_NONE,
     OT_BITS16,OT_BITS32,OT_BITS64,
     OT_BITS32,OT_BITS64,OT_BITS80,OT_BITS64,OT_BITS64,OT_BITS64,
     OT_NEAR,OT_FAR,OT_SHORT
    )
  );

{$ifdef ATTOP}
  att_opsize2str : array[topsize] of string[2] = ('',
    'b','w','l','bw','bl','wl',
    's','l','q',
    's','l','t','d','q','v',
    '','',''
  );
{$endif}


{*****************************************************************************
                                Conditions
*****************************************************************************}

type
  TAsmCond=(C_None,
    C_A,C_AE,C_B,C_BE,C_C,C_E,C_G,C_GE,C_L,C_LE,C_NA,C_NAE,
    C_NB,C_NBE,C_NC,C_NE,C_NG,C_NGE,C_NL,C_NLE,C_NO,C_NP,
    C_NS,C_NZ,C_O,C_P,C_PE,C_PO,C_S,C_Z
  );

const
  cond2str:array[TAsmCond] of string[3]=('',
    'a','ae','b','be','c','e','g','ge','l','le','na','nae',
    'nb','nbe','nc','ne','ng','nge','nl','nle','no','np',
    'ns','nz','o','p','pe','po','s','z'
  );
  inverse_cond:array[TAsmCond] of TAsmCond=(C_None,
    C_NA,C_NAE,C_NB,C_NBE,C_NC,C_NE,C_NG,C_NGE,C_NL,C_NLE,C_A,C_AE,
    C_B,C_BE,C_C,C_E,C_G,C_GE,C_L,C_LE,C_O,C_P,
    C_S,C_Z,C_NO,C_NP,C_NP,C_P,C_NS,C_NZ
  );

const
  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'
  );


{*****************************************************************************
                                  Registers
*****************************************************************************}

type
  { enumeration for registers, don't change the order }
  { it's used by the register size conversions        }
  tregister = (R_NO,
    R_EAX,R_ECX,R_EDX,R_EBX,R_ESP,R_EBP,R_ESI,R_EDI,
    R_AX,R_CX,R_DX,R_BX,R_SP,R_BP,R_SI,R_DI,
    R_AL,R_CL,R_DL,R_BL,R_AH,R_CH,R_BH,R_DH,
    R_CS,R_DS,R_ES,R_SS,R_FS,R_GS,
    R_ST,R_ST0,R_ST1,R_ST2,R_ST3,R_ST4,R_ST5,R_ST6,R_ST7,
    R_DR0,R_DR1,R_DR2,R_DR3,R_DR6,R_DR7,
    R_CR0,R_CR2,R_CR3,R_CR4,
    R_TR3,R_TR4,R_TR5,R_TR6,R_TR7,
    R_MM0,R_MM1,R_MM2,R_MM3,R_MM4,R_MM5,R_MM6,R_MM7,
    R_XMM0,R_XMM1,R_XMM2,R_XMM3,R_XMM4,R_XMM5,R_XMM6,R_XMM7
  );

  tregisterset = set of tregister;

  reg2strtable = array[tregister] of string[6];

const
  firstreg = low(tregister);
  lastreg  = high(tregister);

  firstsreg = R_CS;
  lastsreg  = R_GS;

  regset8bit  : tregisterset = [R_AL..R_DH];
  regset16bit : tregisterset = [R_AX..R_DI,R_CS..R_SS];
  regset32bit : tregisterset = [R_EAX..R_EDI];

  { 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
  );

  { Convert reg to operand type }
  reg_2_type:array[firstreg..lastreg] of longint = (OT_NONE,
    OT_REG_EAX,OT_REG_ECX,OT_REG32,OT_REG32,OT_REG32,OT_REG32,OT_REG32,OT_REG32,
    OT_REG_AX,OT_REG_CX,OT_REG_DX,OT_REG16,OT_REG16,OT_REG16,OT_REG16,OT_REG16,
    OT_REG_AL,OT_REG_CL,OT_REG8,OT_REG8,OT_REG8,OT_REG8,OT_REG8,OT_REG8,
    OT_REG_CS,OT_REG_DESS,OT_REG_DESS,OT_REG_DESS,OT_REG_FSGS,OT_REG_FSGS,
    OT_FPU0,OT_FPU0,OT_FPUREG,OT_FPUREG,OT_FPUREG,OT_FPUREG,OT_FPUREG,OT_FPUREG,OT_FPUREG,
    OT_REG_DREG,OT_REG_DREG,OT_REG_DREG,OT_REG_DREG,OT_REG_DREG,OT_REG_DREG,
    OT_REG_CREG,OT_REG_CREG,OT_REG_CREG,OT_REG_CR4,
    OT_REG_TREG,OT_REG_TREG,OT_REG_TREG,OT_REG_TREG,OT_REG_TREG,
    OT_MMXREG,OT_MMXREG,OT_MMXREG,OT_MMXREG,OT_MMXREG,OT_MMXREG,OT_MMXREG,OT_MMXREG,
    OT_XMMREG,OT_XMMREG,OT_XMMREG,OT_XMMREG,OT_XMMREG,OT_XMMREG,OT_XMMREG,OT_XMMREG
  );

{$ifdef INTELOP}
  int_reg2str : reg2strtable = ('',
    'eax','ecx','edx','ebx','esp','ebp','esi','edi',
    'ax','cx','dx','bx','sp','bp','si','di',
    'al','cl','dl','bl','ah','ch','bh','dh',
    'cs','ds','es','ss','fs','gs',
    'st','st(0)','st(1)','st(2)','st(3)','st(4)','st(5)','st(6)','st(7)',
    'dr0','dr1','dr2','dr3','dr6','dr7',
    'cr0','cr2','cr3','cr4',
    'tr3','tr4','tr5','tr6','tr7',
    'mm0','mm1','mm2','mm3','mm4','mm5','mm6','mm7',
    'xmm0','xmm1','xmm2','xmm3','xmm4','xmm5','xmm6','xmm7'
  );

  int_nasmreg2str : reg2strtable = ('',
    'eax','ecx','edx','ebx','esp','ebp','esi','edi',
    'ax','cx','dx','bx','sp','bp','si','di',
    'al','cl','dl','bl','ah','ch','bh','dh',
    'cs','ds','es','ss','fs','gs',
    'st0','st0','st1','st2','st3','st4','st5','st6','st7',
    'dr0','dr1','dr2','dr3','dr6','dr7',
    'cr0','cr2','cr3','cr4',
    'tr3','tr4','tr5','tr6','tr7',
    'mm0','mm1','mm2','mm3','mm4','mm5','mm6','mm7',
    'xmm0','xmm1','xmm2','xmm3','xmm4','xmm5','xmm6','xmm7'
  );
{$endif}

{$ifdef ATTREG}
  att_reg2str : reg2strtable = ('',
    '%eax','%ecx','%edx','%ebx','%esp','%ebp','%esi','%edi',
    '%ax','%cx','%dx','%bx','%sp','%bp','%si','%di',
    '%al','%cl','%dl','%bl','%ah','%ch','%bh','%dh',
    '%cs','%ds','%es','%ss','%fs','%gs',
    '%st','%st(0)','%st(1)','%st(2)','%st(3)','%st(4)','%st(5)','%st(6)','%st(7)',
    '%dr0','%dr1','%dr2','%dr3','%dr6','%dr7',
    '%cr0','%cr2','%cr3','%cr4',
    '%tr3','%tr4','%tr5','%tr6','%tr7',
    '%mm0','%mm1','%mm2','%mm3','%mm4','%mm5','%mm6','%mm7',
    '%xmm0','%xmm1','%xmm2','%xmm3','%xmm4','%xmm5','%xmm6','%xmm7'
  );
{$endif ATTREG}


{*****************************************************************************
                                   Flags
*****************************************************************************}

type
  TResFlags = (F_E,F_NE,F_G,F_L,F_GE,F_LE,F_C,F_NC,F_A,F_AE,F_B,F_BE);

const
  { arrays for boolean location conversions }
  flag_2_cond : array[TResFlags] of TAsmCond =
     (C_E,C_NE,C_G,C_L,C_GE,C_LE,C_C,C_NC,C_A,C_AE,C_B,C_BE);


{*****************************************************************************
                                Reference
*****************************************************************************}

type
  trefoptions=(ref_none,ref_parafixup,ref_localfixup,ref_selffixup);

  { immediate/reference record }
  preference = ^treference;
  treference = packed record
     is_immediate : boolean; { is this used as reference or immediate }
     segment,
     base,
     index       : tregister;
     scalefactor : byte;
     offset      : longint;
     symbol      : tasmsymbol;
     offsetfixup : longint;
     options     : trefoptions;
{$ifdef newcg}
     alignment   : byte;
{$endif newcg}
  end;

{*****************************************************************************
                                Operands
*****************************************************************************}

       { Types of operand }
        toptype=(top_none,top_reg,top_ref,top_const,top_symbol);

        toper=record
          ot  : longint;
          case typ : toptype of
           top_none   : ();
           top_reg    : (reg:tregister);
           top_ref    : (ref:preference);
           top_const  : (val:longint);
           top_symbol : (sym:tasmsymbol;symofs:longint);
        end;



{*****************************************************************************
                             Argument Classification
*****************************************************************************}

type
  TArgClass = (
     { the following classes should be defined by all processor implemnations }
     AC_NOCLASS,
     AC_MEMORY,
     AC_INTEGER,
     AC_FPU,
     { the following argument classes are i386 specific }
     AC_FPUUP,
     AC_SSE,
     AC_SSEUP);

{*****************************************************************************
                               Generic Location
*****************************************************************************}

type
  TLoc=(
    LOC_INVALID,      { added for tracking problems}
    LOC_FPU,          { FPU stack }
    LOC_REGISTER,     { in a processor register }
    LOC_MEM,          { in memory }
    LOC_REFERENCE,    { like LOC_MEM, but lvalue }
    LOC_JUMP,         { boolean results only, jump to false or true label }
    LOC_FLAGS,        { boolean results only, flags are set }
    LOC_CREGISTER,    { Constant register which shouldn't be modified }
    LOC_MMXREGISTER,  { MMX register }
    LOC_CMMXREGISTER, { MMX register variable }
    LOC_CFPUREGISTER, { if it is a FPU register variable on the fpu stack }
    LOC_SSEREGISTER,
    LOC_CSSEREGISTER
  );

  plocation = ^tlocation;
  tlocation = packed record
     case loc : tloc of
        LOC_MEM,LOC_REFERENCE : (reference : treference);
        LOC_FPU : ();
        LOC_JUMP : ();
        LOC_FLAGS : (resflags : tresflags);
        LOC_INVALID : ();

        { it's only for better handling }
        LOC_MMXREGISTER : (mmxreg : tregister);
        { segment in reference at the same place as in loc_register }
        LOC_REGISTER,LOC_CREGISTER : (
        case longint of
          1 : (register,segment,registerhigh : tregister);
          { overlay a registerlow }
          2 : (registerlow : tregister);
        );
  end;

{*****************************************************************************
                                 Constants
*****************************************************************************}

const
  general_registers = [R_EAX,R_EBX,R_ECX,R_EDX];

  intregs = general_registers;
  fpuregs = [];
  mmregs = [R_MM0..R_MM7];

  lvaluelocations = [LOC_REFERENCE,LOC_CFPUREGISTER,
    LOC_CREGISTER,LOC_MMXREGISTER,LOC_CMMXREGISTER];

  registers_saved_on_cdecl = [R_ESI,R_EDI,R_EBX];

  { generic register names }
  stack_pointer = R_ESP;
  frame_pointer = R_EBP;
  self_pointer  = R_ESI;
  accumulator   = R_EAX;
  accumulatorhigh = R_EDX;
  { the register where the vmt offset is passed to the destructor }
  { helper routine                                                }
  vmt_offset_reg = R_EDI;

  scratch_regs : array[1..1] of tregister = (R_EDI);

{ low and high of the available maximum width integer general purpose }
{ registers                                                           }
  LoGPReg = R_EAX;
  HiGPReg = R_EDI;

{ low and high of every possible width general purpose register (same as }
{ above on most architctures apart from the 80x86)                       }
  LoReg = R_EAX;
  HiReg = R_BL;

  cpuflags = [];

  { sizes }
  pointersize   = 4;
  extended_size = 10;
  sizepostfix_pointer = S_L;


{*****************************************************************************
                              Instruction table
*****************************************************************************}

{$ifndef NOAG386BIN}
type
  tinsentry=packed record
    opcode  : tasmop;
    ops     : byte;
    optypes : array[0..2] of longint;
    code    : array[0..maxinfolen] of char;
    flags   : longint;
  end;
  pinsentry=^tinsentry;

  TInsTabCache=array[TasmOp] of longint;
  PInsTabCache=^TInsTabCache;

const
  InsTab:array[0..instabentries-1] of TInsEntry=
{$i i386tab.inc}

var
  InsTabCache : PInsTabCache;
{$endif NOAG386BIN}


{*****************************************************************************
                   Opcode propeties (needed for optimizer)
*****************************************************************************}

{$ifndef NOOPT}
Type
{What an instruction can change}
  TInsChange = (Ch_None,
     {Read from a register}
     Ch_REAX, Ch_RECX, Ch_REDX, Ch_REBX, Ch_RESP, Ch_REBP, Ch_RESI, Ch_REDI,
     {write from a register}
     Ch_WEAX, Ch_WECX, Ch_WEDX, Ch_WEBX, Ch_WESP, Ch_WEBP, Ch_WESI, Ch_WEDI,
     {read and write from/to a register}
     Ch_RWEAX, Ch_RWECX, Ch_RWEDX, Ch_RWEBX, Ch_RWESP, Ch_RWEBP, Ch_RWESI, Ch_RWEDI,
     {modify the contents of a register with the purpose of using
      this changed content afterwards (add/sub/..., but e.g. not rep
      or movsd)}
     Ch_MEAX, Ch_MECX, Ch_MEDX, Ch_MEBX, Ch_MESP, Ch_MEBP, Ch_MESI, Ch_MEDI,
     Ch_CDirFlag {clear direction flag}, Ch_SDirFlag {set dir flag},
     Ch_RFlags, Ch_WFlags, Ch_RWFlags, Ch_FPU,
     Ch_Rop1, Ch_Wop1, Ch_RWop1,Ch_Mop1,
     Ch_Rop2, Ch_Wop2, Ch_RWop2,Ch_Mop2,
     Ch_Rop3, Ch_WOp3, Ch_RWOp3,Ch_Mop3,
     Ch_WMemEDI,
     Ch_All
  );


const
  MaxCh = 3; { Max things a instruction can change }
type
  TInsProp = packed record
    Ch : Array[1..MaxCh] of TInsChange;
  end;

const
  InsProp : array[tasmop] of TInsProp =
{$i i386prop.inc}

{$endif NOOPT}


{*****************************************************************************
                                  Init/Done
*****************************************************************************}

  procedure InitCpu;
  procedure DoneCpu;

{*****************************************************************************
                                  Helpers
*****************************************************************************}

    const
       maxvarregs = 4;
       varregs : array[1..maxvarregs] of tregister =
         (R_EBX,R_EDX,R_ECX,R_EAX);

       maxfpuvarregs = 8;
       max_operands = 3;

       maxintregs = maxvarregs;
       maxfpuregs = maxfpuvarregs;

    function imm_2_type(l:longint):longint;

    { the following functions allow to convert registers }
    { for example reg8toreg32(R_AL) returns R_EAX        }
    { for example reg16toreg32(R_AL) gives an undefined  }
    { result                                             }
    { these functions expects that the turn of           }
    { tregister isn't changed                            }
    function reg8toreg16(reg : tregister) : tregister;
    function reg8toreg32(reg : tregister) : tregister;
    function reg16toreg8(reg : tregister) : tregister;
    function reg32toreg8(reg : tregister) : tregister;
    function reg32toreg16(reg : tregister) : tregister;
    function reg16toreg32(reg : tregister) : tregister;

    { these procedures must be defined by all target cpus }
    function regtoreg8(reg : tregister) : tregister;
    function regtoreg16(reg : tregister) : tregister;
    function regtoreg32(reg : tregister) : tregister;

    { can be ignored on 32 bit systems }
    function regtoreg64(reg : tregister) : tregister;

    { returns the operand prefix for a given register }
    function regsize(reg : tregister) : topsize;

    { resets all values of ref to defaults }
    procedure reset_reference(var ref : treference);
    { set mostly used values of a new reference }
    function new_reference(base : tregister;offset : longint) : preference;

    function newreference(const r : treference) : preference;
    procedure disposereference(var r : preference);

    function reg2str(r : tregister) : string;

    function is_calljmp(o:tasmop):boolean;

    procedure clear_location(var loc : tlocation);
    procedure set_location(var destloc,sourceloc : tlocation);
    procedure swap_location(var destloc,sourceloc : tlocation);


implementation

{$ifdef heaptrc}
  uses
      ppheap;
{$endif heaptrc}

{*****************************************************************************
                                  Helpers
*****************************************************************************}

    function imm_2_type(l:longint):longint;
      begin
        if (l>=-128) and (l<=127) then
         imm_2_type:=OT_IMM8 or OT_SIGNED
        else
         if (l>=-255) and (l<=255) then
          imm_2_type:=OT_IMM8
        else
         if (l>=-32768) and (l<=32767) then
          imm_2_type:=OT_IMM16 or OT_SIGNED
        else
         if (l>=-65536) and (l<=65535) then
          imm_2_type:=OT_IMM16 or OT_SIGNED
         else
          imm_2_type:=OT_IMM32;
      end;

    function reg2str(r : tregister) : string;
      const
         a : array[R_NO..R_BL] of string[3] =
          ('','EAX','ECX','EDX','EBX','ESP','EBP','ESI','EDI',
           'AX','CX','DX','BX','SP','BP','SI','DI',
           'AL','CL','DL','BL');
      begin
         if r in [R_ST0..R_ST7] then
           reg2str:='ST('+tostr(longint(r)-longint(R_ST0))+')'
         else
           reg2str:=a[r];
      end;


    function is_calljmp(o:tasmop):boolean;
      begin
        case o of
          A_CALL,
          A_JCXZ,
          A_JECXZ,
          A_JMP,
          A_LOOP,
          A_LOOPE,
          A_LOOPNE,
          A_LOOPNZ,
          A_LOOPZ,
          A_Jcc :
            is_calljmp:=true;
          else
            is_calljmp:=false;
        end;
      end;


    procedure disposereference(var r : preference);
      begin
         dispose(r);
         r:=nil;
      end;


    function newreference(const r : treference) : preference;
      var
         p : preference;
      begin
         new(p);
         p^:=r;
         newreference:=p;
      end;


    function reg8toreg16(reg : tregister) : tregister;

      begin
         reg8toreg16:=reg32toreg16(reg8toreg32(reg));
      end;

    function reg16toreg8(reg : tregister) : tregister;

      begin
         reg16toreg8:=reg32toreg8(reg16toreg32(reg));
      end;

    function reg16toreg32(reg : tregister) : tregister;

      begin
         reg16toreg32:=tregister(byte(reg)-byte(R_EDI));
      end;

    function reg32toreg16(reg : tregister) : tregister;

      begin
         reg32toreg16:=tregister(byte(reg)+byte(R_EDI));
      end;

    function reg32toreg8(reg : tregister) : tregister;

      begin
         reg32toreg8:=tregister(byte(reg)+byte(R_DI));
      end;

    function reg8toreg32(reg : tregister) : tregister;

      begin
         reg8toreg32:=tregister(byte(reg)-byte(R_DI));
      end;

    function regtoreg8(reg : tregister) : tregister;

     begin
        regtoreg8:=reg32toreg8(reg);
     end;

    function regtoreg16(reg : tregister) : tregister;

     begin
        regtoreg16:=reg32toreg16(reg);
     end;

    function regtoreg32(reg : tregister) : tregister;

     begin
        regtoreg32:=reg;
     end;

    function regtoreg64(reg : tregister) : tregister;

     begin
        { to avoid warning }
        regtoreg64:=R_NO;
     end;

function regsize(reg : tregister) : topsize;
begin
   if reg in regset8bit then
     regsize:=S_B
   else if reg in regset16bit then
     regsize:=S_W
   else if reg in regset32bit then
     regsize:=S_L;
end;


procedure reset_reference(var ref : treference);
begin
  FillChar(ref,sizeof(treference),0);
end;


function new_reference(base : tregister;offset : longint) : preference;
var
  r : preference;
begin
  new(r);
  FillChar(r^,sizeof(treference),0);
  r^.base:=base;
  r^.offset:=offset;
  new_reference:=r;
end;

    procedure clear_location(var loc : tlocation);

      begin
        loc.loc:=LOC_INVALID;
      end;

    {This is needed if you want to be able to delete the string with the nodes !!}
    procedure set_location(var destloc,sourceloc : tlocation);

      begin
        destloc:= sourceloc;
      end;

    procedure swap_location(var destloc,sourceloc : tlocation);

      var
         swapl : tlocation;

      begin
         swapl := destloc;
         destloc := sourceloc;
         sourceloc := swapl;
      end;


{*****************************************************************************
                              Instruction table
*****************************************************************************}

procedure DoneCpu;
begin
  {exitproc:=saveexit; }
{$ifndef NOAG386BIN}
  if assigned(instabcache) then
    dispose(instabcache);
{$endif NOAG386BIN}
end;


procedure BuildInsTabCache;
{$ifndef NOAG386BIN}
var
  i : longint;
{$endif}
begin
{$ifndef NOAG386BIN}
  new(instabcache);
  FillChar(instabcache^,sizeof(tinstabcache),$ff);
  i:=0;
  while (i<InsTabEntries) do
   begin
     if InsTabCache^[InsTab[i].OPcode]=-1 then
      InsTabCache^[InsTab[i].OPcode]:=i;
     inc(i);
   end;
{$endif NOAG386BIN}
end;


procedure InitCpu;
begin
{$ifndef NOAG386BIN}
  if not assigned(instabcache) then
    BuildInsTabCache;
{$endif NOAG386BIN}
end;

end.
{
  $Log$
  Revision 1.7  2001-12-06 17:57:40  florian
    + parasym to tparaitem added

  Revision 1.6  2001/09/28 20:39:33  jonas
    * changed all flow control structures (except for exception handling
      related things) to processor independent code (in new ncgflw unit)
    + generic cgobj unit which contains lots of code generator helpers with
      global "cg" class instance variable
    + cgcpu unit for i386 (implements processor specific routines of the above
      unit)
    * updated cgbase and cpubase for the new code generator units
    * include ncgflw unit in cpunode unit

  Revision 1.5  2001/05/18 23:01:13  peter
    * portable constants

  Revision 1.4  2001/04/13 01:22:18  peter
    * symtable change to classes
    * range check generation and errors fixed, make cycle DEBUG=1 works
    * memory leaks fixed

  Revision 1.3  2001/02/20 21:34:04  peter
    * iret, lret fixes

  Revision 1.2  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 1.1  2000/10/15 09:39:37  peter
    * moved cpu*.pas to i386/
    * renamed n386 to common cpunode

  Revision 1.7  2000/09/26 20:06:13  florian
    * hmm, still a lot of work to get things compilable

  Revision 1.6  2000/09/24 15:06:14  peter
    * use defines.inc

  Revision 1.5  2000/08/27 16:11:50  peter
    * moved some util functions from globals,cobjects to cutils
    * splitted files into finput,fmodule

  Revision 1.4  2000/08/05 13:25:06  peter
    * packenum 1 fixes (merged)

  Revision 1.3  2000/07/14 05:11:48  michael
  + Patch to 1.1

  Revision 1.2  2000/07/13 11:32:39  michael
  + removed logs

}