LXR qemu/linux-user/openrisc/cpu

   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
  27void 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
  87void 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}
  97