sim/ppc/altivec_registers.h

   1 /* Altivec registers, for PSIM, the PowerPC simulator.
   2
   3    Copyright 2003-2020 Free Software Foundation, Inc.
   4
   5    Contributed by Red Hat Inc; developed under contract from Motorola.
   6    Written by matthew green <mrg@redhat.com>.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 /* Manage this as 4 32-bit entities, 8 16-bit entities or 16 8-bit
  24    entities.  */
  25 typedef union
  26 {
  27   unsigned8 b[16];
  28   unsigned16 h[8];
  29   unsigned32 w[4];
  30 } vreg;
  31
  32 typedef unsigned32 vscreg;
  33
  34 struct altivec_regs {
  35   /* AltiVec Registers */
  36   vreg vr[32];
  37   vscreg vscr;
  38 };
  39
  40 /* AltiVec registers */
  41 #define VR(N)           cpu_registers(processor)->altivec.vr[N]
  42
  43 /* AltiVec vector status and control register */
  44 #define VSCR            cpu_registers(processor)->altivec.vscr
  45
  46 /* AltiVec endian helpers, wrong endian hosts vs targets need to be
  47    sure to get the right bytes/halfs/words when the order matters.
  48    Note that many AltiVec instructions do not depend on byte order and
  49    work on N independant bits of data.  This is only for the
  50    instructions that actually move data around.  */
  51
  52 #if (WITH_HOST_BYTE_ORDER == BIG_ENDIAN)
  53 #define AV_BINDEX(x)    ((x) & 15)
  54 #define AV_HINDEX(x)    ((x) & 7)
  55 #else
  56 static char endian_b2l_bindex[16] = { 3, 2, 1, 0, 7, 6, 5, 4,
  57                              11, 10, 9, 8, 15, 14, 13, 12 };
  58 static char endian_b2l_hindex[16] = { 1, 0, 3, 2, 5, 4, 7, 6 };
  59 #define AV_BINDEX(x)    endian_b2l_bindex[(x) & 15]
  60 #define AV_HINDEX(x)    endian_b2l_hindex[(x) & 7]
  61 #endif