target/openrisc/exception_helper.c

   1 /*
   2  * OpenRISC exception helper routines
   3  *
   4  * Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
   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 2.1 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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "cpu.h"
  22 #include "exec/exec-all.h"
  23 #include "exec/helper-proto.h"
  24 #include "exception.h"
  25
  26 void HELPER(exception)(CPUOpenRISCState *env, uint32_t excp)
  27 {
  28     OpenRISCCPU *cpu = env_archcpu(env);
  29
  30     raise_exception(cpu, excp);
  31 }
  32
  33 static void QEMU_NORETURN do_range(CPUOpenRISCState *env, uintptr_t pc)
  34 {
  35     CPUState *cs = env_cpu(env);
  36
  37     cs->exception_index = EXCP_RANGE;
  38     cpu_loop_exit_restore(cs, pc);
  39 }
  40
  41 void HELPER(ove_cy)(CPUOpenRISCState *env)
  42 {
  43     if (env->sr_cy) {
  44         do_range(env, GETPC());
  45     }
  46 }
  47
  48 void HELPER(ove_ov)(CPUOpenRISCState *env)
  49 {
  50     if (env->sr_ov < 0) {
  51         do_range(env, GETPC());
  52     }
  53 }
  54
  55 void HELPER(ove_cyov)(CPUOpenRISCState *env)
  56 {
  57     if (env->sr_cy || env->sr_ov < 0) {
  58         do_range(env, GETPC());
  59     }
  60 }