text: 
  /*---------------------------------------------------------------*/
  /*--- begin                               guest_ppc_helpers.c ---*/
  /*---------------------------------------------------------------*/
  
  /*
     This file is part of Valgrind, a dynamic binary instrumentation
     framework.
  
     Copyright (C) 2004-2010 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_emwarn.h"
  #include "libvex_guest_ppc32.h"
  #include "libvex_guest_ppc64.h"
  #include "libvex_ir.h"
  #include "libvex.h"
  
  #include "main_util.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__) || defined(_AIX)
     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__) || defined(_AIX)
     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__) || defined(_AIX)
     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 )
  {
    UChar ref[32];
    ULong i;
    /* 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 );
  
    (*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 ( HChar* function_name,
                                   IRExpr** args,
                                   IRStmt** precedingStmts,
                                   Int      n_precedingStmts )
  {
     return NULL;
  }
  
  IRExpr* guest_ppc64_spechelper ( HChar* function_name,
                                   IRExpr** args,
                                   IRStmt** precedingStmts,
                                   Int      n_precedingStmts )
  {
     return NULL;
  }
  
  
  /*----------------------------------------------*/
  /*--- The exported fns ..                    ---*/
  /*----------------------------------------------*/
  
  /* VISIBLE TO LIBVEX CLIENT */
  UInt LibVEX_GuestPPC32_get_CR ( /*IN*/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*/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*/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 );
     return w;
  }
  
  
  /* VISIBLE TO LIBVEX CLIENT */
  /* Note: %XER is 32 bits even for ppc64 */
  UInt LibVEX_GuestPPC64_get_XER ( /*IN*/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 );
     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);
  }
  
  /* 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);
  }
  
  /* VISIBLE TO LIBVEX CLIENT */
  void LibVEX_GuestPPC32_initialise ( /*OUT*/VexGuestPPC32State* vex_state )
  {
     Int i;
     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 = (UInt)PPCrm_NEAREST;
  
     vex_state->guest_VRSAVE = 0;
  
     vex_state->guest_VSCR = 0x0;  // Non-Java mode = 0
  
     vex_state->guest_EMWARN = EmWarn_NONE;
  
     vex_state->guest_TISTART = 0;
     vex_state->guest_TILEN   = 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;
  }
  
  
  /* VISIBLE TO LIBVEX CLIENT */
  void LibVEX_GuestPPC64_initialise ( /*OUT*/VexGuestPPC64State* vex_state )
  {
     Int i;
     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 = (UInt)PPCrm_NEAREST;
  
     vex_state->guest_VRSAVE = 0;
  
     vex_state->guest_VSCR = 0x0;  // Non-Java mode = 0
  
     vex_state->guest_EMWARN = EmWarn_NONE;
  
     vex_state->padding = 0;
  
     vex_state->guest_TISTART = 0;
     vex_state->guest_TILEN   = 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->padding2 = 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.]]
  */
  Bool guest_ppc32_state_requires_precise_mem_exns ( Int minoff, 
                                                     Int maxoff )
  {
     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 < lr_min || minoff > lr_max) {
        /* no overlap with LR */
     } else {
        return True;
     }
  
     if (maxoff < r1_min || minoff > r1_max) {
        /* no overlap with R1 */
     } 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 )
  {
     /* 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 < lr_min || minoff > lr_max) {
        /* no overlap with LR */
     } else {
        return True;
     }
  
     if (maxoff < r1_min || minoff > r1_max) {
        /* no overlap with R1 */
     } 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 = 11,
  
            .alwaysDefd 
  	  = { /*  0 */ ALWAYSDEFD32(guest_CIA),
  	      /*  1 */ ALWAYSDEFD32(guest_EMWARN),
  	      /*  2 */ ALWAYSDEFD32(guest_TISTART),
  	      /*  3 */ ALWAYSDEFD32(guest_TILEN),
  	      /*  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)
              }
          };
  
  #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 = 11,
  
            .alwaysDefd 
  	  = { /*  0 */ ALWAYSDEFD64(guest_CIA),
  	      /*  1 */ ALWAYSDEFD64(guest_EMWARN),
  	      /*  2 */ ALWAYSDEFD64(guest_TISTART),
  	      /*  3 */ ALWAYSDEFD64(guest_TILEN),
  	      /*  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)
              }
          };
  
  /*---------------------------------------------------------------*/
  /*--- end                                 guest_ppc_helpers.c ---*/
  /*---------------------------------------------------------------*/
  