{
    Copyright (c) 1998-2002 by Florian Klaempfl

    Contains the base types for the PowerPC

    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.

 ****************************************************************************
}
{ This Unit contains the base types for the PowerPC64
}
unit cpubase;

{$I fpcdefs.inc}

interface

uses
  strings, globtype,
  cutils, cclasses, aasmbase, cpuinfo, cgbase;

{*****************************************************************************
                                Assembler Opcodes
*****************************************************************************}

type
  TAsmOp = (A_None,
    { normal opcodes }
    a_add, a_add_, a_addo, a_addo_, a_addc, a_addc_, a_addco, a_addco_,
    a_adde, a_adde_, a_addeo, a_addeo_, a_addi, a_addic, a_addic_, a_addis,
    a_addme, a_addme_, a_addmeo, a_addmeo_, a_addze, a_addze_, a_addzeo,
    a_addzeo_, a_and, a_and_, a_andc, a_andc_, a_andi_, a_andis_, a_b,
    a_ba, a_bl, a_bla, a_bc, a_bca, a_bcl, a_bcla, a_bcctr, a_bcctrl, a_bclr,
    a_bclrl, a_cmp, a_cmpi, a_cmpl, a_cmpli, a_cntlzw, a_cntlzw_, a_crand,
    a_crandc, a_creqv, a_crnand, a_crnor, a_cror, a_crorc, a_crxor, a_dcba,
    a_dcbf, a_dcbi, a_dcbst, a_dcbt, a_dcbtst, a_dcbz, a_divw, a_divw_, a_divwo,
      a_divwo_,
    a_divwu, a_divwu_, a_divwuo, a_divwuo_, a_eciwx, a_ecowx, a_eieio, a_eqv,
    a_eqv_, a_extsb, a_extsb_, a_extsh, a_extsh_, a_fabs, a_fabs_, a_fadd,
    a_fadd_, a_fadds, a_fadds_, a_fcmpo, a_fcmpu, a_fctiw, a_fctiw_, a_fctiwz,
    a_fctwz_, a_fdiv, a_fdiv_, a_fdivs, a_fdivs_, a_fmadd, a_fmadd_, a_fmadds,
    a_fmadds_, a_fmr, a_fmsub, a_fmsub_, a_fmsubs, a_fmsubs_, a_fmul, a_fmul_,
    a_fmuls, a_fmuls_, a_fnabs, a_fnabs_, a_fneg, a_fneg_, a_fnmadd,
    a_fnmadd_, a_fnmadds, a_fnmadds_, a_fnmsub, a_fnmsub_, a_fnmsubs,
    a_fnmsubs_, a_fres, a_fres_, a_frsp, a_frsp_, a_frsqrte, a_frsqrte_,
    a_fsel, a_fsel_, a_fsqrt, a_fsqrt_, a_fsqrts, a_fsqrts_, a_fsub, a_fsub_,
    a_fsubs, a_fsubs_, a_icbi, a_isync, a_lbz, a_lbzu, a_lbzux, a_lbzx,
    a_lfd, a_lfdu, a_lfdux, a_lfdx, a_lfs, a_lfsu, a_lfsux, a_lfsx, a_lha,
    a_lhau, a_lhaux, a_lhax, a_lhbrx, a_lhz, a_lhzu, a_lhzux, a_lhzx, a_lmw,
    a_lswi, a_lswx, a_lwarx, a_lwbrx, a_lwz, a_lwzu, a_lwzux, a_lwzx, a_mcrf,
    a_mcrfs, a_mcrxr, a_mfcr, a_mffs, a_mffs_, a_mfmsr, a_mfspr, a_mfsr,
    a_mfsrin, a_mftb, a_mtcrf, a_mtfsb0, a_mtfsb1, a_mtfsf, a_mtfsf_,
    a_mtfsfi, a_mtfsfi_, a_mtmsr, a_mtspr, a_mtsr, a_mtsrin, a_mulhw,
    a_mulhw_, a_mulhwu, a_mulhwu_, a_mulli, a_mullw, a_mullw_, a_mullwo,
    a_mullwo_, a_nand, a_nand_, a_neg, a_neg_, a_nego, a_nego_, a_nor, a_nor_,
    a_or, a_or_, a_orc, a_orc_, a_ori, a_oris, a_rfi, a_rlwimi, a_rlwimi_,
    a_rlwinm, a_rlwinm_, a_rlwnm, a_sc, a_slw, a_slw_, a_sraw, a_sraw_,
    a_srawi, a_srawi_, a_srw, a_srw_, a_stb, a_stbu, a_stbux, a_stbx, a_stfd,
    a_stfdu, a_stfdux, a_stfdx, a_stfiwx, a_stfs, a_stfsu, a_stfsux, a_stfsx,
    a_sth, a_sthbrx, a_sthu, a_sthux, a_sthx, a_stmw, a_stswi, a_stswx, a_stw,
    a_stwbrx, a_stwcx_, a_stwu, a_stwux, a_stwx, a_subf, a_subf_, a_subfo,
    a_subfo_, a_subfc, a_subfc_, a_subfco, a_subfco_, a_subfe, a_subfe_,
    a_subfeo, a_subfeo_, a_subfic, a_subfme, a_subfme_, a_subfmeo, a_subfmeo_,
    a_subfze, a_subfze_, a_subfzeo, a_subfzeo_, a_sync, a_tlbia, a_tlbie,
    a_tlbsync, a_tw, a_twi, a_xor, a_xor_, a_xori, a_xoris,
    { simplified mnemonics }
    a_subi, a_subis, a_subic, a_subic_, a_sub, a_sub_, a_subo, a_subo_,
    a_subc, a_subc_, a_subco, a_subco_, a_cmpwi, a_cmpw, a_cmplwi, a_cmplw,
    a_extlwi, a_extlwi_, a_extrwi, a_extrwi_, a_inslwi, a_inslwi_, a_insrwi,
    a_insrwi_, a_rotlwi, a_rotlwi_, a_rotlw, a_rotlw_, a_slwi, a_slwi_,
    a_srwi, a_srwi_, a_clrlwi, a_clrlwi_, a_clrrwi, a_clrrwi_, a_clrslwi,
    a_clrslwi_, a_bf, a_bt, a_blr, a_bctr, a_blrl, a_bctrl, a_crset, a_crclr, a_crmove,
    a_crnot, a_mt {move to special prupose reg}, a_mf
      {move from special purpose reg},
    a_nop, a_li, a_lis, a_la, a_mr, a_mr_, a_not, a_mtcr, a_mtlr, a_mflr,
    a_mtctr, a_mfctr,
    A_EXTSW,
    A_RLDIMI,
    A_STD, A_STDU, A_STDX, A_STDUX,
    A_LD, A_LDU, A_LDX, A_LDUX,
    A_CMPD, A_CMPDI, A_CMPLD, A_CMPLDI,
    A_SRDI, A_SRADI,
    A_SLDI,
    A_RLDCL, A_RLDCL_, A_RLDICL, A_RLDICL_, A_RLDCR, A_RLDCR_, A_RLDICR, A_RLDICR_,
    A_DIVDU, A_DIVDU_, A_DIVD, A_DIVD_, A_MULLD, A_MULLD_, A_MULHD, A_MULHD_, A_SRAD, A_SLD, A_SRD,
    A_DIVDUO_, A_DIVDO_,
    A_LWA, A_LWAX, A_LWAUX,
    A_FCFID,
    A_LDARX, A_STDCX_, A_CNTLZD,
    A_LVX, A_STVX,
    A_MULLDO, A_MULLDO_, A_MULHDU, A_MULHDU_,
    A_MFXER,
    A_FCTID, A_FCTID_, A_FCTIDZ, A_FCTIDZ_,
    A_EXTRDI, A_EXTRDI_, A_INSRDI, A_INSRDI_,
    A_LWSYNC);

  {# This should define the array of instructions as string }
  op2strtable = array[tasmop] of string[8];

const
  {# First value of opcode enumeration }
  firstop = low(tasmop);
  {# Last value of opcode enumeration  }
  lastop = high(tasmop);

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

type
  { Number of registers used for indexing in tables }
  tregisterindex = 0..{$I rppcnor.inc} - 1;

const
  maxvarregs = 32 - 6;
    { 32 int registers - r0 - stackpointer - r2 - 3 scratch registers }
  maxfpuvarregs = 28; { 32 fpuregisters - some scratch registers (minimally 2) }
  { Available Superregisters }
{$I rppcsup.inc}

  { No Subregisters }
  R_SUBWHOLE = R_SUBNONE;

  { Available Registers }
{$I rppccon.inc}

  { Integer Super registers first and last }
  first_int_imreg = $20;

  { Float Super register first and last }
  first_fpu_imreg = $20;

  { MM Super register first and last }
  first_mm_imreg = $20;

{ TODO: Calculate bsstart}
  regnumber_count_bsstart = 64;

  regnumber_table: array[tregisterindex] of tregister = (
{$I rppcnum.inc}
    );

  regstabs_table: array[tregisterindex] of shortint = (
{$I rppcstab.inc}
    );

  regdwarf_table: array[tregisterindex] of shortint = (
{$I rppcdwrf.inc}
    );

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

type
  TAsmCondFlag = (C_None { unconditional jumps },
    { conditions when not using ctr decrement etc }
    C_LT, C_LE, C_EQ, C_GE, C_GT, C_NL, C_NE, C_NG, C_SO, C_NS, C_UN, C_NU,
    { conditions when using ctr decrement etc }
    C_T, C_F, C_DNZ, C_DNZT, C_DNZF, C_DZ, C_DZT, C_DZF);

  TDirHint = (DH_None, DH_Minus, DH_Plus);

const
  { these are in the XER, but when moved to CR_x they correspond with the }
  { bits below                                                            }
  C_OV = C_GT;
  C_CA = C_EQ;
  C_NO = C_NG;
  C_NC = C_NE;

type
  TAsmCond = packed record
    dirhint: tdirhint;
    case simple: boolean of
      false: (BO, BI: byte);
      true: (
        cond: TAsmCondFlag;
        case byte of
          0: ();
          { specifies in which part of the cr the bit has to be }
          { tested for blt,bgt,beq,..,bnu                       }
          1: (cr: RS_CR0..RS_CR7);
          { specifies the bit to test for bt,bf,bdz,..,bdzf }
          2: (crbit: byte)
          );
  end;

const
  AsmCondFlag2BO: array[C_T..C_DZF] of Byte =
  (12, 4, 16, 8, 0, 18, 10, 2);

  AsmCondFlag2BOLT_NU: array[C_LT..C_NU] of Byte =
  (12, 4, 12, 4, 12, 4, 4, 4, 12, 4, 12, 4);

  AsmCondFlag2BI: array[C_LT..C_NU] of Byte =
  (0, 1, 2, 0, 1, 0, 2, 1, 3, 3, 3, 3);

  AsmCondFlagTF: array[TAsmCondFlag] of Boolean =
  (false, true, false, true, false, true, false, false, false, true, false,
    true, false,
    true, false, false, true, false, false, true, false);

  AsmCondFlag2Str : array[TAsmCondFlag] of string[4] = ({cf_none}'',
    { conditions when not using ctr decrement etc}
    'lt', 'le', 'eq', 'ge', 'gt', 'nl', 'ne', 'ng', 'so', 'ns', 'un', 'nu',
    't', 'f', 'dnz', 'dnzt', 'dnzf', 'dz', 'dzt', 'dzf');

  UpperAsmCondFlag2Str: array[TAsmCondFlag] of string[4] = ({cf_none}'',
    { conditions when not using ctr decrement etc}
    'LT', 'LE', 'EQ', 'GE', 'GT', 'NL', 'NE', 'NG', 'SO', 'NS', 'UN', 'NU',
    'T', 'F', 'DNZ', 'DNZT', 'DNZF', 'DZ', 'DZT', 'DZF');

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

type
  TResFlagsEnum = (F_EQ, F_NE, F_LT, F_LE, F_GT, F_GE, F_SO, F_FX, F_FEX, F_VX,F_OX,
                   { For IEEE-compliant floating-point compares, only <= and >=
                     are actually needed but the other two are for inverse. }
                   F_FA,F_FAE,F_FB,F_FBE);

  TResFlags = record
    cr: RS_CR0..RS_CR7;
    flag: TResFlagsEnum;
  end;

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

const
  { MacOS only. Whether the direct data area (TOC) directly contain
    global variables. Otherwise it contains pointers to global variables. }
  macos_direct_globals = false;

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

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

const
  max_operands = 5;

  {*****************************************************************************
                            Default generic sizes
  *****************************************************************************}

  {# Defines the default address size for a processor, }
  OS_ADDR = OS_64;
  {# the natural int size for a processor,
     has to match osuinttype/ossinttype as initialized in psystem }
  OS_INT = OS_64;
  OS_SINT = OS_S64;
  {# the maximum float size for a processor,           }
  OS_FLOAT = OS_F64;
  {# the size of a vector register for a processor     }
  OS_VECTOR = OS_M128;

  {*****************************************************************************
                                 GDB Information
  *****************************************************************************}

        {# Register indexes for stabs information, when some
           parameters or variables are stored in registers.

           Taken from rs6000.h (DBX_REGISTER_NUMBER)
           from GCC 3.x source code. PowerPC has 1:1 mapping
           according to the order of the registers defined
           in GCC

        }

  stab_regindex: array[tregisterindex] of shortint = (
{$I rppcstab.inc}
    );

  {*****************************************************************************
                            Generic Register names
  *****************************************************************************}

  // Stack pointer register
  NR_STACK_POINTER_REG = NR_R1;
  RS_STACK_POINTER_REG = RS_R1;
  // old stack pointer register used during copying variables from the caller
  // stack frame
  NR_OLD_STACK_POINTER_REG = NR_R12;
  // Frame pointer register
  NR_FRAME_POINTER_REG = NR_STACK_POINTER_REG;
  RS_FRAME_POINTER_REG = RS_STACK_POINTER_REG;
  {# Register for addressing absolute data in a position independant way,
     such as in PIC code. The exact meaning is ABI specific. For
     further information look at GCC source : PIC_OFFSET_TABLE_REGNUM

     Taken from GCC rs6000.h
  }
{ TODO: As indicated in rs6000.h, but can't find it anywhere else!}
  NR_PIC_OFFSET_REG = NR_R30;
  { Return address of a function }
  NR_RETURN_ADDRESS_REG = NR_R0;
  { Results are returned in this register (64-bit values) }
  NR_FUNCTION_RETURN_REG = NR_R3;
  RS_FUNCTION_RETURN_REG = RS_R3;
  { The value returned from a function is available in this register }
  NR_FUNCTION_RESULT_REG = NR_FUNCTION_RETURN_REG;
  RS_FUNCTION_RESULT_REG = RS_FUNCTION_RETURN_REG;

  NR_FPU_RESULT_REG = NR_F1;
  NR_MM_RESULT_REG = NR_M0;

  NR_DEFAULTFLAGS = NR_CR;
  RS_DEFAULTFLAGS = RS_CR;

  {*****************************************************************************
                         GCC /ABI linking information
  *****************************************************************************}

  {# Required parameter alignment when calling a routine declared as
     stdcall and cdecl. The alignment value should be the one defined
     by GCC or the target ABI.
  }
  std_param_align = 8;
  vmx_std_param_align = 16;

  {*****************************************************************************
                              CPU Dependent Constants
  *****************************************************************************}

  LinkageAreaSizeELF = 48;
  LinkageAreaSizeELFv2 = 32;
  { offset in the linkage area for the saved stack pointer }
  LA_SP = 0;
  { offset in the linkage area for the saved conditional register}
  LA_CR_SYSV = 8;
  { offset in the linkage area for the saved link register}
  LA_LR_AIX = 16;
  LA_LR_SYSV = 16;
  { offset in the linkage area for the saved RTOC register}
  LA_RTOC_SYSV = 40;
  LA_RTOC_AIX = 40;
  LA_RTOC_ELFV2 = 24;

  PARENT_FRAMEPOINTER_OFFSET = 24;

  NR_RTOC = NR_R2;

  ELF_STACK_ALIGN = 16;

  { the size of the "red zone" which must not be changed by asynchronous calls
   in the stack frame and can be used for storing temps }
  RED_ZONE_SIZE = 288;
  
  { minimum size of the stack frame if one exists }
  MINIMUM_STACKFRAME_SIZE = 112;
  MINIMUM_STACKFRAME_SIZE_ELFV2 = 112 - 16;

  maxfpuregs = 8;

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

function is_calljmp(o: tasmop): boolean;

procedure inverse_flags(var r: TResFlags);
function flags_to_cond(const f: TResFlags): TAsmCond;
procedure create_cond_imm(BO, BI: byte; var r: TAsmCond);
procedure create_cond_norm(cond: TAsmCondFlag; cr: byte; var r: TasmCond);

function cgsize2subreg(regtype: tregistertype; s: Tcgsize): Tsubregister;
{ Returns the tcgsize corresponding with the size of reg.}
function reg_cgsize(const reg: tregister): tcgsize;

function findreg_by_number(r: Tregister): tregisterindex;
function std_regnum_search(const s: string): Tregister;
function std_regname(r: Tregister): string;
function is_condreg(r: tregister): boolean;

function inverse_cond(const c: TAsmCond): TAsmCond; {$IFDEF USEINLINE}inline;{$ENDIF USEINLINE}
function conditions_equal(const c1, c2: TAsmCond): boolean;

 { Checks if Subset is a subset of c (e.g. "less than" is a subset of "less than or equal" }
function condition_in(const Subset, c: TAsmCond): Boolean;

function dwarf_reg(r:tregister):shortint;
function dwarf_reg_no_error(r:tregister):shortint;
function eh_return_data_regno(nr: longint): longint;

implementation

uses
  rgBase, globals, verbose, itcpugas;

const
  std_regname_table: TRegNameTable = (
{$I rppcstd.inc}
    );

  regnumber_index: array[tregisterindex] of tregisterindex = (
{$I rppcrni.inc}
    );

  std_regname_index: array[tregisterindex] of tregisterindex = (
{$I rppcsri.inc}
    );

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

function is_calljmp(o: tasmop): boolean;
begin
  is_calljmp := false;
  case o of
    A_B, A_BA, A_BL, A_BLA, A_BC, A_BCA, A_BCL, A_BCLA, A_BCCTR, A_BCCTRL,
    A_BCLR, A_BF, A_BT,
    A_BCLRL, A_TW, A_TWI: is_calljmp := true;
    else
      ;
  end;
end;

procedure inverse_flags(var r: TResFlags);
const
  inv_flags: array[F_EQ..F_GE] of TResFlagsEnum =
  (F_NE, F_EQ, F_GE, F_GE, F_LE, F_LT);
  inv_fpuflags: array[F_FA..F_FBE] of TResFlagsEnum =
  (F_FBE,F_FB,F_FAE,F_FA);
begin
  if r.flag in [F_EQ..F_GE] then
    r.flag := inv_flags[r.flag]
  else if r.flag in [F_FA..F_FBE] then
    r.flag := inv_fpuflags[r.flag]
  else
    internalerror(2014041901);
end;

function inverse_cond(const c: TAsmCond): Tasmcond;
{$IFDEF USEINLINE}inline;
{$ENDIF USEINLINE}
const
  inv_condflags: array[TAsmCondFlag] of TAsmCondFlag = (C_None,
    C_GE, C_GT, C_NE, C_LT, C_LE, C_LT, C_EQ, C_GT, C_NS, C_SO, C_NU, C_UN,
    C_F, C_T, C_DNZ, C_DNZF, C_DNZT, C_DZ, C_DZF, C_DZT);
begin
  if (c.cond in [C_DNZ, C_DZ]) then
    internalerror(2005022501);
  result := c;
  result.cond := inv_condflags[c.cond];
end;

function conditions_equal(const c1, c2: TAsmCond): boolean;
begin
  result :=
    (c1.simple and c2.simple) and
    (c1.cond = c2.cond) and
    ((not (c1.cond in [C_T..C_DZF]) and
    (c1.cr = c2.cr)) or
    (c1.crbit = c2.crbit));
end;

{ Checks if Subset is a subset of c (e.g. "less than" is a subset of "less than or equal" }
function condition_in(const Subset, c: TAsmCond): Boolean;
  begin
    Result := (c.cond = C_None) or conditions_equal(Subset, c);

    { TODO: Can a PowerPC programmer please update this procedure to
      actually detect subsets? Thanks. [Kit] }
  end;

function flags_to_cond(const f: TResFlags): TAsmCond;
const
  flag_2_cond: array[F_EQ..F_SO] of TAsmCondFlag =
  (C_EQ, C_NE, C_LT, C_LE, C_GT, C_GE, C_SO);
begin
  if f.flag > high(flag_2_cond) then
    internalerror(200112301);
  result.simple := true;
  result.cr := f.cr;
  if byte(f.cr)=0 then
    Comment(V_error,'Wrong use of whole CR register in falgs_to_cond');
  result.cond := flag_2_cond[f.flag];
end;

procedure create_cond_imm(BO, BI: byte; var r: TAsmCond);
begin
  r.simple := false;
  r.bo := bo;
  r.bi := bi;
end;

procedure create_cond_norm(cond: TAsmCondFlag; cr: byte; var r: TasmCond);
begin
  r.dirhint := DH_None;
  r.simple := true;
  r.cond := cond;
  case cond of
    C_NONE: ;
    C_T..C_DZF: r.crbit := cr
  else
    r.cr := RS_CR0 + cr;
  end;
end;

function is_condreg(r: tregister): boolean;
var
  supreg: tsuperregister;
begin
  result := false;
  if (getregtype(r) = R_SPECIALREGISTER) then
  begin
    supreg := getsupreg(r);
    result := (supreg >= RS_CR0) and (supreg <= RS_CR7);
  end;
end;

function reg_cgsize(const reg: tregister): tcgsize;
begin
  case getregtype(reg) of
    R_INTREGISTER:
      result := OS_64;
    R_MMREGISTER:
	  result := OS_M128;
    R_FPUREGISTER:
	  result := OS_F64;
  else
    internalerror(200303181);
  end;
end;

function cgsize2subreg(regtype: tregistertype; s: Tcgsize): Tsubregister;
begin
  cgsize2subreg := R_SUBWHOLE;
end;

function findreg_by_number(r: Tregister): tregisterindex;
begin
  result := rgBase.findreg_by_number_table(r, regnumber_index);
end;

function std_regnum_search(const s: string): Tregister;
begin
  result := regnumber_table[findreg_by_name_table(s, std_regname_table,
    std_regname_index)];
end;

function std_regname(r: Tregister): string;
var
  p: tregisterindex;
begin
  p := findreg_by_number_table(r, regnumber_index);
  if p <> 0 then
    result := std_regname_table[p]
  else
    result := generic_regname(r);
end;

function dwarf_reg(r:tregister):shortint;
begin
  result:=regdwarf_table[findreg_by_number(r)];
  if result=-1 then
    internalerror(200603251);
end;

function dwarf_reg_no_error(r:tregister):shortint;
  begin
    result:=regdwarf_table[findreg_by_number(r)];
  end;

function eh_return_data_regno(nr: longint): longint;
begin
  if (nr>=0) and (nr<2) then
    result:=nr+3
  else
    result:=-1;
end;

end.

