LXR qemu/linux-user/sh4/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(CPUSH4State *env)
  27{
  28    CPUState *cs = env_cpu(env);
  29    int trapnr, ret;
  30
  31    while (1) {
  32        bool arch_interrupt = true;
  33
  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 0x160:
  41            env->pc += 2;
  42            ret = do_syscall(env,
  43                             env->gregs[3],
  44                             env->gregs[4],
  45                             env->gregs[5],
  46                             env->gregs[6],
  47                             env->gregs[7],
  48                             env->gregs[0],
  49                             env->gregs[1],
  50                             0, 0);
  51            if (ret == -QEMU_ERESTARTSYS) {
  52                env->pc -= 2;
  53            } else if (ret != -QEMU_ESIGRETURN) {
  54                env->gregs[0] = ret;
  55            }
  56            break;
  57        case EXCP_INTERRUPT:
  58            /* just indicate that signals should be handled asap */
  59            break;
  60        case EXCP_DEBUG:
  61            force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
  62            break;
  63        case EXCP_ATOMIC:
  64            cpu_exec_step_atomic(cs);
  65            arch_interrupt = false;
  66            break;
  67        default:
  68            fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
  69            cpu_dump_state(cs, stderr, 0);
  70            exit(EXIT_FAILURE);
  71        }
  72        process_pending_signals (env);
  73
  74        /* Most of the traps imply an exception or interrupt, which
  75           implies an REI instruction has been executed.  Which means
  76           that LDST (aka LOK_ADDR) should be cleared.  But there are
  77           a few exceptions for traps internal to QEMU.  */
  78        if (arch_interrupt) {
  79            env->lock_addr = -1;
  80        }
  81    }
  82}
  83
  84void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
  85{
  86    int i;
  87
  88    for(i = 0; i < 16; i++) {
  89        env->gregs[i] = regs->regs[i];
  90    }
  91    env->pc = regs->pc;
  92}
  93