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 2.1 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 "qemu/osdep.h"
  22 #include "cpu.h"
  23 #include "exec/exec-all.h"
  24 #include "internal.h"
  25
  26 void ppc_cpu_record_sigsegv(CPUState *cs, vaddr address,
  27                             MMUAccessType access_type,
  28                             bool maperr, uintptr_t retaddr)
  29 {
  30     CPUPPCState *env = cpu_env(cs);
  31     int exception, error_code;
  32
  33     /*
  34      * Both DSISR and the "trap number" (exception vector offset,
  35      * looked up from exception_index) are present in the linux-user
  36      * signal frame.
  37      * FIXME: we don't actually populate the trap number properly.
  38      * It would be easiest to fill in an env->trap value now.
  39      */
  40     if (access_type == MMU_INST_FETCH) {
  41         exception = POWERPC_EXCP_ISI;
  42         error_code = 0x40000000;
  43     } else {
  44         exception = POWERPC_EXCP_DSI;
  45         error_code = 0x40000000;
  46         if (access_type == MMU_DATA_STORE) {
  47             error_code |= 0x02000000;
  48         }
  49         env->spr[SPR_DAR] = address;
  50         env->spr[SPR_DSISR] = error_code;
  51     }
  52     cs->exception_index = exception;
  53     env->error_code = error_code;
  54     cpu_loop_exit_restore(cs, retaddr);
  55 }