target-ppc/user_only_helper.c

   1 /*
   2  *  PowerPC MMU stub handling for user mode emulation
   3  *
   4  *  Copyright (c) 2003-2007 Jocelyn Mayer
   5  *  Copyright (c) 2013 David Gibson, IBM Corporation.
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "cpu.h"
  22
  23 int cpu_handle_mmu_fault(CPUPPCState *env, target_ulong address, int rw,
  24                          int mmu_idx)
  25 {
  26     int exception, error_code;
  27
  28     if (rw == 2) {
  29         exception = POWERPC_EXCP_ISI;
  30         error_code = 0x40000000;
  31     } else {
  32         exception = POWERPC_EXCP_DSI;
  33         error_code = 0x40000000;
  34         if (rw) {
  35             error_code |= 0x02000000;
  36         }
  37         env->spr[SPR_DAR] = address;
  38         env->spr[SPR_DSISR] = error_code;
  39     }
  40     env->exception_index = exception;
  41     env->error_code = error_code;
  42
  43     return 1;
  44 }