target-ppc/op_helper_mem.h

   1 /*
   2  *  PowerPC emulation micro-operations helpers for qemu.
   3  *
   4  *  Copyright (c) 2003-2007 Jocelyn Mayer
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "op_mem_access.h"
  22
  23 /* PowerPC 601 specific instructions (POWER bridge) */
  24 // XXX: to be tested
  25 void glue(do_POWER_lscbx, MEMSUFFIX) (int dest, int ra, int rb)
  26 {
  27     int i, c, d, reg;
  28
  29     d = 24;
  30     reg = dest;
  31     for (i = 0; i < T1; i++) {
  32         c = glue(ldu8, MEMSUFFIX)((uint32_t)T0++);
  33         /* ra (if not 0) and rb are never modified */
  34         if (likely(reg != rb && (ra == 0 || reg != ra))) {
  35             env->gpr[reg] = (env->gpr[reg] & ~(0xFF << d)) | (c << d);
  36         }
  37         if (unlikely(c == T2))
  38             break;
  39         if (likely(d != 0)) {
  40             d -= 8;
  41         } else {
  42             d = 24;
  43             reg++;
  44             reg = reg & 0x1F;
  45         }
  46     }
  47     T0 = i;
  48 }
  49
  50 #undef MEMSUFFIX