linux-user/openrisc/cpu_loop.c

   1 /*
   2  *  qemu user cpu loop
   3  *
   4  *  Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program 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
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "qemu-common.h"
  22 #include "qemu.h"
  23 #include "user-internals.h"
  24 #include "cpu_loop-common.h"
  25 #include "signal-common.h"
  26
  27 void cpu_loop(CPUOpenRISCState *env)
  28 {
  29     CPUState *cs = env_cpu(env);
  30     int trapnr;
  31     abi_long ret;
  32
  33     for (;;) {
  34         cpu_exec_start(cs);
  35         trapnr = cpu_exec(cs);
  36         cpu_exec_end(cs);
  37         process_queued_cpu_work(cs);
  38
  39         switch (trapnr) {
  40         case EXCP_SYSCALL:
  41             env->pc += 4;   /* 0xc00; */
  42             ret = do_syscall(env,
  43                              cpu_get_gpr(env, 11), /* return value       */
  44                              cpu_get_gpr(env, 3),  /* r3 - r7 are params */
  45                              cpu_get_gpr(env, 4),
  46                              cpu_get_gpr(env, 5),
  47                              cpu_get_gpr(env, 6),
  48                              cpu_get_gpr(env, 7),
  49                              cpu_get_gpr(env, 8), 0, 0);
  50             if (ret == -QEMU_ERESTARTSYS) {
  51                 env->pc -= 4;
  52             } else if (ret != -QEMU_ESIGRETURN) {
  53                 cpu_set_gpr(env, 11, ret);
  54             }
  55             break;
  56         case EXCP_ALIGN:
  57             force_sig_fault(TARGET_SIGBUS, TARGET_BUS_ADRALN, env->eear);
  58             break;
  59         case EXCP_ILLEGAL:
  60             force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPC, env->pc);
  61             break;
  62         case EXCP_INTERRUPT:
  63             /* We processed the pending cpu work above.  */
  64             break;
  65         case EXCP_DEBUG:
  66             force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
  67             break;
  68         case EXCP_ATOMIC:
  69             cpu_exec_step_atomic(cs);
  70             break;
  71         case EXCP_RANGE:
  72             /* Requires SR.OVE set, which linux-user won't do. */
  73             cpu_abort(cs, "Unexpected RANGE exception");
  74         case EXCP_FPE:
  75             /*
  76              * Requires FPSCR.FPEE set.  Writes to FPSCR from usermode not
  77              * yet enabled in kernel ABI, so linux-user does not either.
  78              */
  79             cpu_abort(cs, "Unexpected FPE exception");
  80         default:
  81             g_assert_not_reached();
  82         }
  83         process_pending_signals(env);
  84     }
  85 }
  86
  87 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
  88 {
  89     int i;
  90
  91     for (i = 0; i < 32; i++) {
  92         cpu_set_gpr(env, i, regs->gpr[i]);
  93     }
  94     env->pc = regs->pc;
  95     cpu_set_sr(env, regs->sr);
  96 }