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.h"
  22#include "user-internals.h"
  23#include "cpu_loop-common.h"
  24#include "signal-common.h"
  25
  26void cpu_loop(CPUOpenRISCState *env)
  27{
  28    CPUState *cs = env_cpu(env);
  29    int trapnr;
  30    abi_long ret;
  31
  32    for (;;) {
  33        cpu_exec_start(cs);
  34        trapnr = cpu_exec(cs);
  35        cpu_exec_end(cs);
  36        process_queued_cpu_work(cs);
  37
  38        switch (trapnr) {
  39        case EXCP_SYSCALL:
  40            env->pc += 4;   /* 0xc00; */
  41            ret = do_syscall(env,
  42                             cpu_get_gpr(env, 11), /* return value       */
  43                             cpu_get_gpr(env, 3),  /* r3 - r7 are params */
  44                             cpu_get_gpr(env, 4),
  45                             cpu_get_gpr(env, 5),
  46                             cpu_get_gpr(env, 6),
  47                             cpu_get_gpr(env, 7),
  48                             cpu_get_gpr(env, 8), 0, 0);
  49            if (ret == -QEMU_ERESTARTSYS) {
  50                env->pc -= 4;
  51            } else if (ret != -QEMU_ESIGRETURN) {
  52                cpu_set_gpr(env, 11, ret);
  53            }
  54            break;
  55        case EXCP_ALIGN:
  56            force_sig_fault(TARGET_SIGBUS, TARGET_BUS_ADRALN, env->eear);
  57            break;
  58        case EXCP_ILLEGAL:
  59            force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPC, env->pc);
  60            break;
  61        case EXCP_INTERRUPT:
  62            /* We processed the pending cpu work above.  */
  63            break;
  64        case EXCP_DEBUG:
  65            force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
  66            break;
  67        case EXCP_ATOMIC:
  68            cpu_exec_step_atomic(cs);
  69            break;
  70        case EXCP_RANGE:
  71            /* Requires SR.OVE set, which linux-user won't do. */
  72            cpu_abort(cs, "Unexpected RANGE exception");
  73        case EXCP_FPE:
  74            /*
  75             * Requires FPSCR.FPEE set.  Writes to FPSCR from usermode not
  76             * yet enabled in kernel ABI, so linux-user does not either.
  77             */
  78            cpu_abort(cs, "Unexpected FPE exception");
  79        default:
  80            g_assert_not_reached();
  81        }
  82        process_pending_signals(env);
  83    }
  84}
  85
  86void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
  87{
  88    int i;
  89
  90    for (i = 0; i < 32; i++) {
  91        cpu_set_gpr(env, i, regs->gpr[i]);
  92    }
  93    env->pc = regs->pc;
  94    cpu_set_sr(env, regs->sr);
  95}
  96