
/*---------------------------------------------------------------*/
/*--- begin                               guest_ppc_helpers.c ---*/
/*---------------------------------------------------------------*/

/*
   This file is part of Valgrind, a dynamic binary instrumentation
   framework.

   Copyright (C) 2004-2017 OpenWorks LLP
      info@open-works.net

   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., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.

   The GNU General Public License is contained in the file COPYING.

   Neither the names of the U.S. Department of Energy nor the
   University of California nor the names of its contributors may be
   used to endorse or promote products derived from this software
   without prior written permission.
*/

#include "libvex_basictypes.h"
#include "libvex_emnote.h"
#include "libvex_guest_ppc32.h"
#include "libvex_guest_ppc64.h"
#include "libvex_ir.h"
#include "libvex.h"

#include "main_util.h"
#include "main_globals.h"
#include "guest_generic_bb_to_IR.h"
#include "guest_ppc_defs.h"


/* This file contains helper functions for ppc32 and ppc64 guest code.
   Calls to these functions are generated by the back end.  These
   calls are of course in the host machine code and this file will be
   compiled to host machine code, so that all makes sense.

   Only change the signatures of these helper functions very
   carefully.  If you change the signature here, you'll have to change
   the parameters passed to it in the IR calls constructed by
   guest-ppc/toIR.c.
*/


/*---------------------------------------------------------------*/
/*--- Misc integer helpers.                                   ---*/
/*---------------------------------------------------------------*/

/* CALLED FROM GENERATED CODE */
/* DIRTY HELPER (non-referentially-transparent) */
/* Horrible hack.  On non-ppc platforms, return 1. */
/* Reads a complete, consistent 64-bit TB value. */
ULong ppcg_dirtyhelper_MFTB ( void )
{
#  if defined(__powerpc__)
   ULong res;
   UInt  lo, hi1, hi2;
   while (1) {
      __asm__ __volatile__ ("\n"
         "\tmftbu %0\n"
         "\tmftb %1\n"
         "\tmftbu %2\n"
         : "=r" (hi1), "=r" (lo), "=r" (hi2)
      );
      if (hi1 == hi2) break;
   }
   res = ((ULong)hi1) << 32;
   res |= (ULong)lo;
   return res;
#  else
   return 1ULL;
#  endif
}


/* CALLED FROM GENERATED CODE */
/* DIRTY HELPER (non-referentially transparent) */
UInt ppc32g_dirtyhelper_MFSPR_268_269 ( UInt r269 )
{
#  if defined(__powerpc__)
   UInt spr;
   if (r269) {
      __asm__ __volatile__("mfspr %0,269" : "=b"(spr));
   } else {
      __asm__ __volatile__("mfspr %0,268" : "=b"(spr));
   }
   return spr;
#  else
   return 0;
#  endif
}


/* CALLED FROM GENERATED CODE */
/* DIRTY HELPER (I'm not really sure what the side effects are) */
UInt ppc32g_dirtyhelper_MFSPR_287 ( void )
{
#  if defined(__powerpc__)
   UInt spr;
   __asm__ __volatile__("mfspr %0,287" : "=b"(spr));
   return spr;
#  else
   return 0;
#  endif
}


/* CALLED FROM GENERATED CODE */
/* DIRTY HELPER (reads guest state, writes guest mem) */
void ppc32g_dirtyhelper_LVS ( VexGuestPPC32State* gst,
                              UInt vD_off, UInt sh, UInt shift_right )
{
  static
  UChar ref[32] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
                    0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
                    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
                    0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F };
  U128* pU128_src;
  U128* pU128_dst;

  vassert( vD_off       <= sizeof(VexGuestPPC32State)-8 );
  vassert( sh           <= 15 );
  vassert( shift_right  <=  1 );
  if (shift_right)
     sh = 16-sh;
  /* else shift left  */

  pU128_src = (U128*)&ref[sh];
  pU128_dst = (U128*)( ((UChar*)gst) + vD_off );

  (*pU128_dst)[0] = (*pU128_src)[0];
  (*pU128_dst)[1] = (*pU128_src)[1];
  (*pU128_dst)[2] = (*pU128_src)[2];
  (*pU128_dst)[3] = (*pU128_src)[3];
}

/* CALLED FROM GENERATED CODE */
/* DIRTY HELPER (reads guest state, writes guest mem) */
void ppc64g_dirtyhelper_LVS ( VexGuestPPC64State* gst,
                              UInt vD_off, UInt sh, UInt shift_right,
                              UInt endness )
{
  UChar ref[32];
  ULong i;
  Int k;
  /* ref[] used to be a static const array, but this doesn't work on
     ppc64 because VEX doesn't load the TOC pointer for the call here,
     and so we wind up picking up some totally random other data.
     (It's a wonder we don't segfault.)  So, just to be clear, this
     "fix" (vex r2073) is really a kludgearound for the fact that
     VEX's 64-bit ppc code generation doesn't provide a valid TOC
     pointer for helper function calls.  Ick.  (Bug 250038) */
  for (i = 0; i < 32; i++) ref[i] = i;

  U128* pU128_src;
  U128* pU128_dst;

  vassert( vD_off       <= sizeof(VexGuestPPC64State)-8 );
  vassert( sh           <= 15 );
  vassert( shift_right  <=  1 );
  if (shift_right)
     sh = 16-sh;
  /* else shift left  */

  pU128_src = (U128*)&ref[sh];
  pU128_dst = (U128*)( ((UChar*)gst) + vD_off );

  if ((0x1 & endness) == 0x0) {
     /* Little endian */
     unsigned char *srcp, *dstp;
     srcp = (unsigned char *)pU128_src;
     dstp = (unsigned char *)pU128_dst;
     for (k = 15; k >= 0; k--, srcp++)
        dstp[k] = *srcp;
  } else {
     (*pU128_dst)[0] = (*pU128_src)[0];
     (*pU128_dst)[1] = (*pU128_src)[1];
     (*pU128_dst)[2] = (*pU128_src)[2];
     (*pU128_dst)[3] = (*pU128_src)[3];
  }
}


/* Helper-function specialiser. */

IRExpr* guest_ppc32_spechelper ( const HChar* function_name,
                                 IRExpr** args,
                                 IRStmt** precedingStmts,
                                 Int      n_precedingStmts )
{
   return NULL;
}

IRExpr* guest_ppc64_spechelper ( const HChar* function_name,
                                 IRExpr** args,
                                 IRStmt** precedingStmts,
                                 Int      n_precedingStmts )
{
   return NULL;
}


/* 16-bit floating point number is stored in the lower 16-bits of 32-bit value */
#define I16_EXP_MASK       0x7C00
#define I16_FRACTION_MASK  0x03FF
#define I32_EXP_MASK       0x7F800000
#define I32_FRACTION_MASK  0x007FFFFF
#define I64_EXP_MASK       0x7FF0000000000000ULL
#define I64_FRACTION_MASK  0x000FFFFFFFFFFFFFULL
#define V128_EXP_MASK      0x7FFF000000000000ULL
#define V128_FRACTION_MASK 0x0000FFFFFFFFFFFFULL  /* upper 64-bit fractional mask */

ULong generate_C_FPCC_helper( ULong irType, ULong src_hi, ULong src )
{
   UInt NaN, inf, zero, norm, dnorm, pos;
   UInt bit0, bit1, bit2, bit3;
   UInt sign_bit = 0;
   ULong exp_mask = 0, exp_part = 0, frac_part = 0;
   ULong fpcc, c;

   if ( irType == Ity_I16 ) {
      frac_part = I16_FRACTION_MASK & src;
      exp_mask = I16_EXP_MASK;
      exp_part = exp_mask & src;
      sign_bit = src >> 15;

   } else if ( irType == Ity_I32 ) {
      frac_part = I32_FRACTION_MASK & src;
      exp_mask = I32_EXP_MASK;
      exp_part = exp_mask & src;
      sign_bit = src >> 31;

   } else  if ( irType == Ity_I64 ) {
     frac_part = I64_FRACTION_MASK & src;
     exp_mask = I64_EXP_MASK;
     exp_part = exp_mask & src;
     sign_bit = src >> 63;

   } else  if ( irType == Ity_F128 ) {
     /* only care if the frac part is zero or non-zero */
     frac_part = (V128_FRACTION_MASK & src_hi) | src;
     exp_mask = V128_EXP_MASK;
     exp_part = exp_mask & src_hi;
     sign_bit = src_hi >> 63;
   } else {
     vassert(0);  // Unknown value of irType
   }

   /* NaN: exponene is all ones, fractional part not zero */
   if ((exp_part == exp_mask) && (frac_part != 0))
     NaN = 1;
   else
     NaN = 0;

   /* inf: exponent all 1's, fraction part is zero */
   if ((exp_part == exp_mask) && (frac_part == 0))
     inf = 1;
   else
     inf = 0;

   /* zero: exponent is 0, fraction part is zero */
   if ((exp_part == 0) && (frac_part == 0))
     zero = 1;
   else
     zero = 0;

   /* norm: exponent is not 0, exponent is not all 1's */
   if ((exp_part != 0) && (exp_part != exp_mask))
     norm = 1;
   else
     norm = 0;

   /* dnorm: exponent is all 0's, fraction is not 0 */
   if ((exp_part == 0) && (frac_part != 0))
     dnorm = 1;
   else
     dnorm = 0;

   /* pos: MSB is 1 */
   if (sign_bit == 0)
     pos = 1;
   else
     pos = 0;

   /* calculate FPCC */
   /* If the result is NaN then must force bits 1, 2 and 3 to zero
    * to get correct result.
    */
   bit0 = NaN | inf;

   bit1 = (!NaN) & zero;
   bit2 =  (!NaN) & ((pos & dnorm) | (pos & norm) | (pos & inf))
      & ((!zero) & (!NaN));
   bit3 =  (!NaN) & (((!pos) & dnorm) |((!pos) & norm) | ((!pos) & inf))
      & ((!zero) & (!NaN));

   fpcc = (bit3 << 3) | (bit2 << 2) | (bit1 << 1) | bit0;

   /* calculate C */
   c = NaN | ((!pos) & dnorm) | ((!pos) & zero) | (pos & dnorm);

   /* return C in the upper 32-bits and FPCC in the lower 32 bits */
   return (c <<32) | fpcc;
}


/*---------------------------------------------------------------*/
/*--- Misc BCD clean helpers.                                 ---*/
/*---------------------------------------------------------------*/

/* NOTE, the clean and dirty helpers need to called using the
 * fnptr_to_fnentry() function wrapper to handle the Big Endian
 * pointer-to-function ABI and the Little Endian ABI.
 */

/* This C-helper takes a 128-bit BCD value as two 64-bit pieces.
 * It checks the string to see if it is a valid 128-bit BCD value.
 * A valid BCD value has a sign value in bits [3:0] between 0xA
 * and 0xF inclusive. each of the BCD digits represented as a 4-bit
 * hex number in bits BCD value[128:4] mut be between 0 and 9
 * inclusive.  Returns an unsigned 64-bit value if valid.
 */
ULong is_BCDstring128_helper( ULong Signed, ULong bcd_string_hi,
                              ULong bcd_string_low ) {
   Int i;
   ULong valid_bcd, sign_valid = False;
   ULong digit;
   UInt  sign;

   if ( Signed == True ) {
      sign = bcd_string_low & 0xF;
      if( ( sign >= 0xA ) && ( sign <= 0xF ) )
         sign_valid = True;

      /* Change the sign digit to a zero
       * so the for loop below works the same
       * for signed and unsigned BCD stings
       */
      bcd_string_low &= 0xFFFFFFFFFFFFFFF0ULL;

   } else {
      sign_valid = True;  /* set sign to True so result is only
                             based on the validity of the digits */
   }

   valid_bcd = True;  // Assume true to start
   for( i = 0; i < 32; i++ ) {
      /* check high and low 64-bit strings in parallel */
      digit = bcd_string_low & 0xF;
      if ( digit > 0x9 )
         valid_bcd = False;
      bcd_string_low = bcd_string_low >> 4;

      digit = bcd_string_hi & 0xF;
      if ( digit > 0x9 )
         valid_bcd = False;
      bcd_string_hi = bcd_string_hi >> 4;
   }

   return valid_bcd & sign_valid;
}

/* This clean helper takes a signed 32-bit BCD value and a carry in
 * and adds 1 to the value of the BCD value.  The BCD value is passed
 * in as a single 64-bit value.  The incremented value is returned in
 * the lower 32 bits of the result.  If the input was signed the sign of
 * the result is the same as the input.  The carry out is returned in
 * bits [35:32] of the result.
 */
ULong increment_BCDstring32_helper( ULong Signed,
                                    ULong bcd_string, ULong carry_in ) {
   UInt i, num_digits = 8;
   ULong bcd_value, result = 0;
   ULong carry, digit, new_digit;

   carry = carry_in;

   if ( Signed == True ) {
      bcd_value = bcd_string >> 4;   /* remove sign */
      num_digits = num_digits - 1;
   } else {
      bcd_value = bcd_string;
   }

   for( i = 0; i < num_digits; i++ ) {
      digit = bcd_value & 0xF;
      bcd_value = bcd_value >> 4;
      new_digit = digit + carry;

      if ( new_digit > 10 ) {
         carry = 1;
         new_digit = new_digit - 10;

      } else {
         carry = 0;
      }
      result =  result | (new_digit << (i*4) );
   }

   if ( Signed == True ) {
      result = ( carry << 32) | ( result << 4 ) | ( bcd_string & 0xF );
   } else {
      result = ( carry << 32) | result;
   }

   return result;
}

/*---------------------------------------------------------------*/
/*--- Misc packed decimal clean helpers.                      ---*/
/*---------------------------------------------------------------*/

/* This C-helper takes a 64-bit packed decimal value stored in a
 * 64-bit value. It converts the zoned decimal format.  The lower
 * byte may contain a sign value, set it to zero.  If return_upper
 * is zero, return lower 64 bits of result, otherwise return upper
 * 64 bits of the result.
 */
ULong convert_to_zoned_helper( ULong src_hi, ULong src_low,
                               ULong upper_byte, ULong return_upper ) {
   UInt i, sh;
   ULong tmp = 0, new_value;

   /* Remove the sign from the source.  Put in the upper byte of result.
    * Sign inserted later.
    */
   if ( return_upper == 0 ) {  /* return lower 64-bit result */
      for(i = 0; i < 7; i++) {
         sh = ( 8 - i ) * 4;
         new_value = ( ( src_low >> sh ) & 0xf ) | upper_byte;
         tmp = tmp | ( new_value <<  ( ( 7 - i ) * 8 ) );
      }

   } else {
      /* Byte for i=0 is in upper 64-bit of the source, do it separately */
      new_value = ( src_hi & 0xf ) | upper_byte;
      tmp = tmp | new_value << 56;

      for( i = 1; i < 8; i++ ) {
         sh = ( 16 - i ) * 4;
         new_value = ( ( src_low >> sh ) & 0xf ) | upper_byte;
         tmp = tmp | ( new_value <<  ( ( 7 - i ) * 8 ) );
      }
   }
   return tmp;
}

/* This C-helper takes the lower 64-bits of the 128-bit packed decimal
 * src value.  It converts the src value to a 128-bit national format.
 * If return_upper is zero, the helper returns lower 64 bits of result,
 * otherwise it returns the upper 64-bits of the result.
 */
ULong convert_to_national_helper( ULong src, ULong return_upper ) {

   UInt i;
   UInt sh = 3, max = 4, min = 0;  /* initialize max, min for return upper */
   ULong tmp = 0, new_value;

   if ( return_upper == 0 ) {  /* return lower 64-bit result */
      min = 4;
      max = 7;
      sh  = 7;
   }

   for( i = min; i < max; i++ ) {
      new_value = ( ( src >> ( ( 7 - i ) * 4 ) ) & 0xf ) | 0x0030;
      tmp = tmp | ( new_value <<  ( ( sh - i ) * 16 ) );
   }
   return tmp;
}

/* This C-helper takes a 128-bit zoned value stored in a 128-bit
 * value. It converts it to the packed 64-bit decimal format without a
 * a sign value.  The sign is supposed to be in bits [3:0] and the packed
 * value in bits [67:4].  This helper leaves it to the caller to put the
 * result into a V128 and shift the returned value over and put the sign
 * in.
 */
ULong convert_from_zoned_helper( ULong src_hi, ULong src_low ) {
   UInt i;
   ULong tmp = 0, nibble;

   /* Unroll the i = 0 iteration so the sizes of the loop for the upper
    * and lower extraction match.  Skip sign in lease significant byte.
    */
   nibble = ( src_hi >> 56 ) & 0xF;
   tmp = tmp | ( nibble << 60 );

   for( i = 1; i < 8; i++ ) {
      /* get the high nibbles, put into result */
      nibble = ( src_hi >> ( ( 7 - i ) * 8 ) ) & 0xF;
      tmp = tmp | ( nibble << ( ( 15 - i ) * 4 ) );

      /* get the low nibbles, put into result */
      nibble = ( src_low >> ( ( 8 - i ) * 8 ) ) & 0xF;
      tmp = tmp | ( nibble << ( ( 8 - i ) * 4 ) );
   }
   return tmp;
}

/* This C-helper takes a 128-bit national value stored in a 128-bit
 * value. It converts it to a signless packed 64-bit decimal format.
 */
ULong convert_from_national_helper( ULong src_hi, ULong src_low ) {
   UInt i;
   ULong tmp = 0, hword;

   src_low = src_low & 0xFFFFFFFFFFFFFFF0ULL; /* remove the sign */

   for( i = 0; i < 4; i++ ) {
      /* get the high half-word, put into result */
      hword = ( src_hi >> ( ( 3 - i ) * 16 ) ) & 0xF;
      tmp = tmp | ( hword << ( ( 7 - i ) * 4 ) );

      /* get the low half-word, put into result */
      hword = ( src_low >> (  ( 3 - i ) * 16 ) ) & 0xF;
      tmp = tmp | ( hword << ( ( 3 - i ) * 4 ) );
   }
   return tmp;
}

/*----------------------------------------------*/
/*--- The exported fns ..                    ---*/
/*----------------------------------------------*/

/* VISIBLE TO LIBVEX CLIENT */
UInt LibVEX_GuestPPC32_get_CR ( /*IN*/const VexGuestPPC32State* vex_state )
{
#  define FIELD(_n)                                    \
      ( ( (UInt)                                       \
           ( (vex_state->guest_CR##_n##_321 & (7<<1))  \
             | (vex_state->guest_CR##_n##_0 & 1)       \
           )                                           \
        )                                              \
        << (4 * (7-(_n)))                              \
      )

   return 
      FIELD(0) | FIELD(1) | FIELD(2) | FIELD(3)
      | FIELD(4) | FIELD(5) | FIELD(6) | FIELD(7);

#  undef FIELD
}


/* VISIBLE TO LIBVEX CLIENT */
/* Note: %CR is 32 bits even for ppc64 */
UInt LibVEX_GuestPPC64_get_CR ( /*IN*/const VexGuestPPC64State* vex_state )
{
#  define FIELD(_n)                                    \
      ( ( (UInt)                                       \
           ( (vex_state->guest_CR##_n##_321 & (7<<1))  \
             | (vex_state->guest_CR##_n##_0 & 1)       \
           )                                           \
        )                                              \
        << (4 * (7-(_n)))                              \
      )

   return 
      FIELD(0) | FIELD(1) | FIELD(2) | FIELD(3)
      | FIELD(4) | FIELD(5) | FIELD(6) | FIELD(7);

#  undef FIELD
}


/* VISIBLE TO LIBVEX CLIENT */
void LibVEX_GuestPPC32_put_CR ( UInt cr_native,
                                /*OUT*/VexGuestPPC32State* vex_state )
{
   UInt t;

#  define FIELD(_n)                                           \
      do {                                                    \
         t = cr_native >> (4*(7-(_n)));                       \
         vex_state->guest_CR##_n##_0 = toUChar(t & 1);        \
         vex_state->guest_CR##_n##_321 = toUChar(t & (7<<1)); \
      } while (0)

   FIELD(0);
   FIELD(1);
   FIELD(2);
   FIELD(3);
   FIELD(4);
   FIELD(5);
   FIELD(6);
   FIELD(7);

#  undef FIELD
}


/* VISIBLE TO LIBVEX CLIENT */
/* Note: %CR is 32 bits even for ppc64 */
void LibVEX_GuestPPC64_put_CR ( UInt cr_native,
                                /*OUT*/VexGuestPPC64State* vex_state )
{
   UInt t;

#  define FIELD(_n)                                           \
      do {                                                    \
         t = cr_native >> (4*(7-(_n)));                       \
         vex_state->guest_CR##_n##_0 = toUChar(t & 1);        \
         vex_state->guest_CR##_n##_321 = toUChar(t & (7<<1)); \
      } while (0)

   FIELD(0);
   FIELD(1);
   FIELD(2);
   FIELD(3);
   FIELD(4);
   FIELD(5);
   FIELD(6);
   FIELD(7);

#  undef FIELD
}


/* VISIBLE TO LIBVEX CLIENT */
UInt LibVEX_GuestPPC32_get_XER ( /*IN*/const VexGuestPPC32State* vex_state )
{
   UInt w = 0;
   w |= ( ((UInt)vex_state->guest_XER_BC) & 0xFF );
   w |= ( (((UInt)vex_state->guest_XER_SO) & 0x1) << 31 );
   w |= ( (((UInt)vex_state->guest_XER_OV) & 0x1) << 30 );
   w |= ( (((UInt)vex_state->guest_XER_CA) & 0x1) << 29 );
   w |= ( (((UInt)vex_state->guest_XER_OV32) & 0x1) << 19 );
   w |= ( (((UInt)vex_state->guest_XER_CA32) & 0x1) << 18 );
   return w;
}


/* VISIBLE TO LIBVEX CLIENT */
/* Note: %XER is 32 bits even for ppc64 */
UInt LibVEX_GuestPPC64_get_XER ( /*IN*/const VexGuestPPC64State* vex_state )
{
   UInt w = 0;
   w |= ( ((UInt)vex_state->guest_XER_BC) & 0xFF );
   w |= ( (((UInt)vex_state->guest_XER_SO) & 0x1) << 31 );
   w |= ( (((UInt)vex_state->guest_XER_OV) & 0x1) << 30 );
   w |= ( (((UInt)vex_state->guest_XER_CA) & 0x1) << 29 );
   w |= ( (((UInt)vex_state->guest_XER_OV32) & 0x1) << 19 );
   w |= ( (((UInt)vex_state->guest_XER_CA32) & 0x1) << 18 );
   return w;
}


/* VISIBLE TO LIBVEX CLIENT */
void LibVEX_GuestPPC32_put_XER ( UInt xer_native,
                                 /*OUT*/VexGuestPPC32State* vex_state )
{
   vex_state->guest_XER_BC = toUChar(xer_native & 0xFF);
   vex_state->guest_XER_SO = toUChar((xer_native >> 31) & 0x1);
   vex_state->guest_XER_OV = toUChar((xer_native >> 30) & 0x1);
   vex_state->guest_XER_CA = toUChar((xer_native >> 29) & 0x1);
   vex_state->guest_XER_OV32 = toUChar((xer_native >> 19) & 0x1);
   vex_state->guest_XER_CA32 = toUChar((xer_native >> 18) & 0x1);
}

/* VISIBLE TO LIBVEX CLIENT */
/* Note: %XER is 32 bits even for ppc64 */
void LibVEX_GuestPPC64_put_XER ( UInt xer_native,
                                 /*OUT*/VexGuestPPC64State* vex_state )
{
   vex_state->guest_XER_BC = toUChar(xer_native & 0xFF);
   vex_state->guest_XER_SO = toUChar((xer_native >> 31) & 0x1);
   vex_state->guest_XER_OV = toUChar((xer_native >> 30) & 0x1);
   vex_state->guest_XER_CA = toUChar((xer_native >> 29) & 0x1);
   vex_state->guest_XER_OV32 = toUChar((xer_native >> 19) & 0x1);
   vex_state->guest_XER_CA32 = toUChar((xer_native >> 18) & 0x1);
}

/* VISIBLE TO LIBVEX CLIENT */
void LibVEX_GuestPPC32_initialise ( /*OUT*/VexGuestPPC32State* vex_state )
{
   Int i;
   vex_state->host_EvC_FAILADDR = 0;
   vex_state->host_EvC_COUNTER  = 0;
   vex_state->pad3 = 0;
   vex_state->pad4 = 0;

   vex_state->guest_GPR0  = 0;
   vex_state->guest_GPR1  = 0;
   vex_state->guest_GPR2  = 0;
   vex_state->guest_GPR3  = 0;
   vex_state->guest_GPR4  = 0;
   vex_state->guest_GPR5  = 0;
   vex_state->guest_GPR6  = 0;
   vex_state->guest_GPR7  = 0;
   vex_state->guest_GPR8  = 0;
   vex_state->guest_GPR9  = 0;
   vex_state->guest_GPR10 = 0;
   vex_state->guest_GPR11 = 0;
   vex_state->guest_GPR12 = 0;
   vex_state->guest_GPR13 = 0;
   vex_state->guest_GPR14 = 0;
   vex_state->guest_GPR15 = 0;
   vex_state->guest_GPR16 = 0;
   vex_state->guest_GPR17 = 0;
   vex_state->guest_GPR18 = 0;
   vex_state->guest_GPR19 = 0;
   vex_state->guest_GPR20 = 0;
   vex_state->guest_GPR21 = 0;
   vex_state->guest_GPR22 = 0;
   vex_state->guest_GPR23 = 0;
   vex_state->guest_GPR24 = 0;
   vex_state->guest_GPR25 = 0;
   vex_state->guest_GPR26 = 0;
   vex_state->guest_GPR27 = 0;
   vex_state->guest_GPR28 = 0;
   vex_state->guest_GPR29 = 0;
   vex_state->guest_GPR30 = 0;
   vex_state->guest_GPR31 = 0;

   /* Initialise the vector state. */
#  define VECZERO(_vr) _vr[0]=_vr[1]=_vr[2]=_vr[3] = 0;

   VECZERO(vex_state->guest_VSR0 );
   VECZERO(vex_state->guest_VSR1 );
   VECZERO(vex_state->guest_VSR2 );
   VECZERO(vex_state->guest_VSR3 );
   VECZERO(vex_state->guest_VSR4 );
   VECZERO(vex_state->guest_VSR5 );
   VECZERO(vex_state->guest_VSR6 );
   VECZERO(vex_state->guest_VSR7 );
   VECZERO(vex_state->guest_VSR8 );
   VECZERO(vex_state->guest_VSR9 );
   VECZERO(vex_state->guest_VSR10);
   VECZERO(vex_state->guest_VSR11);
   VECZERO(vex_state->guest_VSR12);
   VECZERO(vex_state->guest_VSR13);
   VECZERO(vex_state->guest_VSR14);
   VECZERO(vex_state->guest_VSR15);
   VECZERO(vex_state->guest_VSR16);
   VECZERO(vex_state->guest_VSR17);
   VECZERO(vex_state->guest_VSR18);
   VECZERO(vex_state->guest_VSR19);
   VECZERO(vex_state->guest_VSR20);
   VECZERO(vex_state->guest_VSR21);
   VECZERO(vex_state->guest_VSR22);
   VECZERO(vex_state->guest_VSR23);
   VECZERO(vex_state->guest_VSR24);
   VECZERO(vex_state->guest_VSR25);
   VECZERO(vex_state->guest_VSR26);
   VECZERO(vex_state->guest_VSR27);
   VECZERO(vex_state->guest_VSR28);
   VECZERO(vex_state->guest_VSR29);
   VECZERO(vex_state->guest_VSR30);
   VECZERO(vex_state->guest_VSR31);
   VECZERO(vex_state->guest_VSR32);
   VECZERO(vex_state->guest_VSR33);
   VECZERO(vex_state->guest_VSR34);
   VECZERO(vex_state->guest_VSR35);
   VECZERO(vex_state->guest_VSR36);
   VECZERO(vex_state->guest_VSR37);
   VECZERO(vex_state->guest_VSR38);
   VECZERO(vex_state->guest_VSR39);
   VECZERO(vex_state->guest_VSR40);
   VECZERO(vex_state->guest_VSR41);
   VECZERO(vex_state->guest_VSR42);
   VECZERO(vex_state->guest_VSR43);
   VECZERO(vex_state->guest_VSR44);
   VECZERO(vex_state->guest_VSR45);
   VECZERO(vex_state->guest_VSR46);
   VECZERO(vex_state->guest_VSR47);
   VECZERO(vex_state->guest_VSR48);
   VECZERO(vex_state->guest_VSR49);
   VECZERO(vex_state->guest_VSR50);
   VECZERO(vex_state->guest_VSR51);
   VECZERO(vex_state->guest_VSR52);
   VECZERO(vex_state->guest_VSR53);
   VECZERO(vex_state->guest_VSR54);
   VECZERO(vex_state->guest_VSR55);
   VECZERO(vex_state->guest_VSR56);
   VECZERO(vex_state->guest_VSR57);
   VECZERO(vex_state->guest_VSR58);
   VECZERO(vex_state->guest_VSR59);
   VECZERO(vex_state->guest_VSR60);
   VECZERO(vex_state->guest_VSR61);
   VECZERO(vex_state->guest_VSR62);
   VECZERO(vex_state->guest_VSR63);

#  undef VECZERO

   vex_state->guest_CIA  = 0;
   vex_state->guest_LR   = 0;
   vex_state->guest_CTR  = 0;

   vex_state->guest_XER_SO = 0;
   vex_state->guest_XER_OV = 0;
   vex_state->guest_XER_CA = 0;
   vex_state->guest_XER_BC = 0;

   vex_state->guest_XER_OV32 = 0;
   vex_state->guest_XER_CA32 = 0;

   vex_state->guest_CR0_321 = 0;
   vex_state->guest_CR0_0   = 0;
   vex_state->guest_CR1_321 = 0;
   vex_state->guest_CR1_0   = 0;
   vex_state->guest_CR2_321 = 0;
   vex_state->guest_CR2_0   = 0;
   vex_state->guest_CR3_321 = 0;
   vex_state->guest_CR3_0   = 0;
   vex_state->guest_CR4_321 = 0;
   vex_state->guest_CR4_0   = 0;
   vex_state->guest_CR5_321 = 0;
   vex_state->guest_CR5_0   = 0;
   vex_state->guest_CR6_321 = 0;
   vex_state->guest_CR6_0   = 0;
   vex_state->guest_CR7_321 = 0;
   vex_state->guest_CR7_0   = 0;

   vex_state->guest_FPROUND  = PPCrm_NEAREST;
   vex_state->guest_DFPROUND = PPCrm_NEAREST;
   vex_state->guest_C_FPCC   = 0;
   vex_state->pad2 = 0;

   vex_state->guest_VRSAVE = 0;

   vex_state->guest_VSCR = 0x0;  // Non-Java mode = 0

   vex_state->guest_EMNOTE = EmNote_NONE;

   vex_state->guest_CMSTART = 0;
   vex_state->guest_CMLEN   = 0;

   vex_state->guest_NRADDR = 0;
   vex_state->guest_NRADDR_GPR2 = 0;

   vex_state->guest_REDIR_SP = -1;
   for (i = 0; i < VEX_GUEST_PPC32_REDIR_STACK_SIZE; i++)
      vex_state->guest_REDIR_STACK[i] = 0;

   vex_state->guest_IP_AT_SYSCALL = 0;
   vex_state->guest_SPRG3_RO = 0;
   vex_state->guest_PPR = 0x4ULL << 50;  // medium priority
   vex_state->guest_PSPB = 0x100;  // an arbitrary non-zero value to start with

   vex_state->padding1 = 0;
   /*   vex_state->padding2 = 0;  currently not used */
}


/* VISIBLE TO LIBVEX CLIENT */
void LibVEX_GuestPPC64_initialise ( /*OUT*/VexGuestPPC64State* vex_state )
{
   Int i;
   vex_state->host_EvC_FAILADDR = 0;
   vex_state->host_EvC_COUNTER = 0;
   vex_state->pad0 = 0;
   vex_state->guest_GPR0  = 0;
   vex_state->guest_GPR1  = 0;
   vex_state->guest_GPR2  = 0;
   vex_state->guest_GPR3  = 0;
   vex_state->guest_GPR4  = 0;
   vex_state->guest_GPR5  = 0;
   vex_state->guest_GPR6  = 0;
   vex_state->guest_GPR7  = 0;
   vex_state->guest_GPR8  = 0;
   vex_state->guest_GPR9  = 0;
   vex_state->guest_GPR10 = 0;
   vex_state->guest_GPR11 = 0;
   vex_state->guest_GPR12 = 0;
   vex_state->guest_GPR13 = 0;
   vex_state->guest_GPR14 = 0;
   vex_state->guest_GPR15 = 0;
   vex_state->guest_GPR16 = 0;
   vex_state->guest_GPR17 = 0;
   vex_state->guest_GPR18 = 0;
   vex_state->guest_GPR19 = 0;
   vex_state->guest_GPR20 = 0;
   vex_state->guest_GPR21 = 0;
   vex_state->guest_GPR22 = 0;
   vex_state->guest_GPR23 = 0;
   vex_state->guest_GPR24 = 0;
   vex_state->guest_GPR25 = 0;
   vex_state->guest_GPR26 = 0;
   vex_state->guest_GPR27 = 0;
   vex_state->guest_GPR28 = 0;
   vex_state->guest_GPR29 = 0;
   vex_state->guest_GPR30 = 0;
   vex_state->guest_GPR31 = 0;

   /* Initialise the vector state. */
#  define VECZERO(_vr) _vr[0]=_vr[1]=_vr[2]=_vr[3] = 0;

   VECZERO(vex_state->guest_VSR0 );
   VECZERO(vex_state->guest_VSR1 );
   VECZERO(vex_state->guest_VSR2 );
   VECZERO(vex_state->guest_VSR3 );
   VECZERO(vex_state->guest_VSR4 );
   VECZERO(vex_state->guest_VSR5 );
   VECZERO(vex_state->guest_VSR6 );
   VECZERO(vex_state->guest_VSR7 );
   VECZERO(vex_state->guest_VSR8 );
   VECZERO(vex_state->guest_VSR9 );
   VECZERO(vex_state->guest_VSR10);
   VECZERO(vex_state->guest_VSR11);
   VECZERO(vex_state->guest_VSR12);
   VECZERO(vex_state->guest_VSR13);
   VECZERO(vex_state->guest_VSR14);
   VECZERO(vex_state->guest_VSR15);
   VECZERO(vex_state->guest_VSR16);
   VECZERO(vex_state->guest_VSR17);
   VECZERO(vex_state->guest_VSR18);
   VECZERO(vex_state->guest_VSR19);
   VECZERO(vex_state->guest_VSR20);
   VECZERO(vex_state->guest_VSR21);
   VECZERO(vex_state->guest_VSR22);
   VECZERO(vex_state->guest_VSR23);
   VECZERO(vex_state->guest_VSR24);
   VECZERO(vex_state->guest_VSR25);
   VECZERO(vex_state->guest_VSR26);
   VECZERO(vex_state->guest_VSR27);
   VECZERO(vex_state->guest_VSR28);
   VECZERO(vex_state->guest_VSR29);
   VECZERO(vex_state->guest_VSR30);
   VECZERO(vex_state->guest_VSR31);
   VECZERO(vex_state->guest_VSR32);
   VECZERO(vex_state->guest_VSR33);
   VECZERO(vex_state->guest_VSR34);
   VECZERO(vex_state->guest_VSR35);
   VECZERO(vex_state->guest_VSR36);
   VECZERO(vex_state->guest_VSR37);
   VECZERO(vex_state->guest_VSR38);
   VECZERO(vex_state->guest_VSR39);
   VECZERO(vex_state->guest_VSR40);
   VECZERO(vex_state->guest_VSR41);
   VECZERO(vex_state->guest_VSR42);
   VECZERO(vex_state->guest_VSR43);
   VECZERO(vex_state->guest_VSR44);
   VECZERO(vex_state->guest_VSR45);
   VECZERO(vex_state->guest_VSR46);
   VECZERO(vex_state->guest_VSR47);
   VECZERO(vex_state->guest_VSR48);
   VECZERO(vex_state->guest_VSR49);
   VECZERO(vex_state->guest_VSR50);
   VECZERO(vex_state->guest_VSR51);
   VECZERO(vex_state->guest_VSR52);
   VECZERO(vex_state->guest_VSR53);
   VECZERO(vex_state->guest_VSR54);
   VECZERO(vex_state->guest_VSR55);
   VECZERO(vex_state->guest_VSR56);
   VECZERO(vex_state->guest_VSR57);
   VECZERO(vex_state->guest_VSR58);
   VECZERO(vex_state->guest_VSR59);
   VECZERO(vex_state->guest_VSR60);
   VECZERO(vex_state->guest_VSR61);
   VECZERO(vex_state->guest_VSR62);
   VECZERO(vex_state->guest_VSR63);

#  undef VECZERO

   vex_state->guest_CIA  = 0;
   vex_state->guest_LR   = 0;
   vex_state->guest_CTR  = 0;

   vex_state->guest_XER_SO = 0;
   vex_state->guest_XER_OV = 0;
   vex_state->guest_XER_CA = 0;
   vex_state->guest_XER_BC = 0;

   vex_state->guest_CR0_321 = 0;
   vex_state->guest_CR0_0   = 0;
   vex_state->guest_CR1_321 = 0;
   vex_state->guest_CR1_0   = 0;
   vex_state->guest_CR2_321 = 0;
   vex_state->guest_CR2_0   = 0;
   vex_state->guest_CR3_321 = 0;
   vex_state->guest_CR3_0   = 0;
   vex_state->guest_CR4_321 = 0;
   vex_state->guest_CR4_0   = 0;
   vex_state->guest_CR5_321 = 0;
   vex_state->guest_CR5_0   = 0;
   vex_state->guest_CR6_321 = 0;
   vex_state->guest_CR6_0   = 0;
   vex_state->guest_CR7_321 = 0;
   vex_state->guest_CR7_0   = 0;

   vex_state->guest_FPROUND  = PPCrm_NEAREST;
   vex_state->guest_DFPROUND = PPCrm_NEAREST;
   vex_state->guest_C_FPCC   = 0;
   vex_state->pad2 = 0;

   vex_state->guest_VRSAVE = 0;

   vex_state->guest_VSCR = 0x0;  // Non-Java mode = 0

   vex_state->guest_EMNOTE = EmNote_NONE;

   vex_state->padding = 0;

   vex_state->guest_CMSTART = 0;
   vex_state->guest_CMLEN   = 0;

   vex_state->guest_NRADDR = 0;
   vex_state->guest_NRADDR_GPR2 = 0;

   vex_state->guest_REDIR_SP = -1;
   for (i = 0; i < VEX_GUEST_PPC64_REDIR_STACK_SIZE; i++)
      vex_state->guest_REDIR_STACK[i] = 0;

   vex_state->guest_IP_AT_SYSCALL = 0;
   vex_state->guest_SPRG3_RO = 0;
   vex_state->guest_TFHAR  = 0;
   vex_state->guest_TFIAR  = 0;
   vex_state->guest_TEXASR = 0;
   vex_state->guest_PPR = 0x4ULL << 50;  // medium priority
   vex_state->guest_PSPB = 0x100;  // an arbitrary non-zero value to start with
   vex_state->guest_DSCR = 0;
}


/*-----------------------------------------------------------*/
/*--- Describing the ppc guest state, for the benefit     ---*/
/*--- of iropt and instrumenters.                         ---*/
/*-----------------------------------------------------------*/

/* Figure out if any part of the guest state contained in minoff
   .. maxoff requires precise memory exceptions.  If in doubt return
   True (but this is generates significantly slower code).  

   By default we enforce precise exns for guest R1 (stack pointer),
   CIA (current insn address) and LR (link register).  These are the
   minimum needed to extract correct stack backtraces from ppc
   code. [[NB: not sure if keeping LR up to date is actually
   necessary.]]

   Only R1 is needed in mode VexRegUpdSpAtMemAccess.   
*/
Bool guest_ppc32_state_requires_precise_mem_exns (
        Int minoff, Int maxoff, VexRegisterUpdates pxControl
     )
{
   Int lr_min  = offsetof(VexGuestPPC32State, guest_LR);
   Int lr_max  = lr_min + 4 - 1;
   Int r1_min  = offsetof(VexGuestPPC32State, guest_GPR1);
   Int r1_max  = r1_min + 4 - 1;
   Int cia_min = offsetof(VexGuestPPC32State, guest_CIA);
   Int cia_max = cia_min + 4 - 1;

   if (maxoff < r1_min || minoff > r1_max) {
      /* no overlap with R1 */
      if (pxControl == VexRegUpdSpAtMemAccess)
         return False; // We only need to check stack pointer.
   } else {
      return True;
   }

   if (maxoff < lr_min || minoff > lr_max) {
      /* no overlap with LR */
   } else {
      return True;
   }

   if (maxoff < cia_min || minoff > cia_max) {
      /* no overlap with CIA */
   } else {
      return True;
   }

   return False;
}

Bool guest_ppc64_state_requires_precise_mem_exns (
        Int minoff, Int maxoff, VexRegisterUpdates pxControl
     )
{
   /* Given that R2 is a Big Deal in the ELF ppc64 ABI, it seems
      prudent to be conservative with it, even though thus far there
      is no evidence to suggest that it actually needs to be kept up
      to date wrt possible exceptions. */
   Int lr_min  = offsetof(VexGuestPPC64State, guest_LR);
   Int lr_max  = lr_min + 8 - 1;
   Int r1_min  = offsetof(VexGuestPPC64State, guest_GPR1);
   Int r1_max  = r1_min + 8 - 1;
   Int r2_min  = offsetof(VexGuestPPC64State, guest_GPR2);
   Int r2_max  = r2_min + 8 - 1;
   Int cia_min = offsetof(VexGuestPPC64State, guest_CIA);
   Int cia_max = cia_min + 8 - 1;

   if (maxoff < r1_min || minoff > r1_max) {
      /* no overlap with R1 */
      if (pxControl == VexRegUpdSpAtMemAccess)
         return False; // We only need to check stack pointer.
   } else {
      return True;
   }

   if (maxoff < lr_min || minoff > lr_max) {
      /* no overlap with LR */
   } else {
      return True;
   }

   if (maxoff < r2_min || minoff > r2_max) {
      /* no overlap with R2 */
   } else {
      return True;
   }

   if (maxoff < cia_min || minoff > cia_max) {
      /* no overlap with CIA */
   } else {
      return True;
   }

   return False;
}


#define ALWAYSDEFD32(field)                           \
    { offsetof(VexGuestPPC32State, field),            \
      (sizeof ((VexGuestPPC32State*)0)->field) }

VexGuestLayout
   ppc32Guest_layout 
      = { 
          /* Total size of the guest state, in bytes. */
          .total_sizeB = sizeof(VexGuestPPC32State),

          /* Describe the stack pointer. */
          .offset_SP = offsetof(VexGuestPPC32State,guest_GPR1),
          .sizeof_SP = 4,

          /* Describe the frame pointer. */
          .offset_FP = offsetof(VexGuestPPC32State,guest_GPR1),
          .sizeof_FP = 4,

          /* Describe the instruction pointer. */
          .offset_IP = offsetof(VexGuestPPC32State,guest_CIA),
          .sizeof_IP = 4,

          /* Describe any sections to be regarded by Memcheck as
             'always-defined'. */
          .n_alwaysDefd = 12,

          .alwaysDefd 
	  = { /*  0 */ ALWAYSDEFD32(guest_CIA),
	      /*  1 */ ALWAYSDEFD32(guest_EMNOTE),
	      /*  2 */ ALWAYSDEFD32(guest_CMSTART),
	      /*  3 */ ALWAYSDEFD32(guest_CMLEN),
	      /*  4 */ ALWAYSDEFD32(guest_VSCR),
	      /*  5 */ ALWAYSDEFD32(guest_FPROUND),
              /*  6 */ ALWAYSDEFD32(guest_NRADDR),
	      /*  7 */ ALWAYSDEFD32(guest_NRADDR_GPR2),
	      /*  8 */ ALWAYSDEFD32(guest_REDIR_SP),
	      /*  9 */ ALWAYSDEFD32(guest_REDIR_STACK),
	      /* 10 */ ALWAYSDEFD32(guest_IP_AT_SYSCALL),
	      /* 11 */ ALWAYSDEFD32(guest_C_FPCC)
            }
        };

#define ALWAYSDEFD64(field)                           \
    { offsetof(VexGuestPPC64State, field),            \
      (sizeof ((VexGuestPPC64State*)0)->field) }

VexGuestLayout
   ppc64Guest_layout 
      = { 
          /* Total size of the guest state, in bytes. */
          .total_sizeB = sizeof(VexGuestPPC64State),

          /* Describe the stack pointer. */
          .offset_SP = offsetof(VexGuestPPC64State,guest_GPR1),
          .sizeof_SP = 8,

          /* Describe the frame pointer. */
          .offset_FP = offsetof(VexGuestPPC64State,guest_GPR1),
          .sizeof_FP = 8,

          /* Describe the instruction pointer. */
          .offset_IP = offsetof(VexGuestPPC64State,guest_CIA),
          .sizeof_IP = 8,

          /* Describe any sections to be regarded by Memcheck as
             'always-defined'. */
          .n_alwaysDefd = 12,

          .alwaysDefd 
	  = { /*  0 */ ALWAYSDEFD64(guest_CIA),
	      /*  1 */ ALWAYSDEFD64(guest_EMNOTE),
	      /*  2 */ ALWAYSDEFD64(guest_CMSTART),
	      /*  3 */ ALWAYSDEFD64(guest_CMLEN),
	      /*  4 */ ALWAYSDEFD64(guest_VSCR),
	      /*  5 */ ALWAYSDEFD64(guest_FPROUND),
	      /*  6 */ ALWAYSDEFD64(guest_NRADDR),
	      /*  7 */ ALWAYSDEFD64(guest_NRADDR_GPR2),
	      /*  8 */ ALWAYSDEFD64(guest_REDIR_SP),
	      /*  9 */ ALWAYSDEFD64(guest_REDIR_STACK),
	      /* 10 */ ALWAYSDEFD64(guest_IP_AT_SYSCALL),
	      /* 11 */ ALWAYSDEFD64(guest_C_FPCC)
            }
        };

/*---------------------------------------------------------------*/
/*--- end                                 guest_ppc_helpers.c ---*/
/*---------------------------------------------------------------*/
