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-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(CPUSH4State *env)
  28{
  29    CPUState *cs = env_cpu(env);
  30    int trapnr, ret;
  31    target_siginfo_t info;
  32
  33    while (1) {
  34        bool arch_interrupt = true;
  35
  36        cpu_exec_start(cs);
  37        trapnr = cpu_exec(cs);
  38        cpu_exec_end(cs);
  39        process_queued_cpu_work(cs);
  40
  41        switch (trapnr) {
  42        case 0x160:
  43            env->pc += 2;
  44            ret = do_syscall(env,
  45                             env->gregs[3],
  46                             env->gregs[4],
  47                             env->gregs[5],
  48                             env->gregs[6],
  49                             env->gregs[7],
  50                             env->gregs[0],
  51                             env->gregs[1],
  52                             0, 0);
  53            if (ret == -TARGET_ERESTARTSYS) {
  54                env->pc -= 2;
  55            } else if (ret != -TARGET_QEMU_ESIGRETURN) {
  56                env->gregs[0] = ret;
  57            }
  58            break;
  59        case EXCP_INTERRUPT:
  60            /* just indicate that signals should be handled asap */
  61            break;
  62        case EXCP_DEBUG:
  63            info.si_signo = TARGET_SIGTRAP;
  64            info.si_errno = 0;
  65            info.si_code = TARGET_TRAP_BRKPT;
  66            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  67            break;
  68        case EXCP_ATOMIC:
  69            cpu_exec_step_atomic(cs);
  70            arch_interrupt = false;
  71            break;
  72        default:
  73            fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
  74            cpu_dump_state(cs, stderr, 0);
  75            exit(EXIT_FAILURE);
  76        }
  77        process_pending_signals (env);
  78
  79        /* Most of the traps imply an exception or interrupt, which
  80           implies an REI instruction has been executed.  Which means
  81           that LDST (aka LOK_ADDR) should be cleared.  But there are
  82           a few exceptions for traps internal to QEMU.  */
  83        if (arch_interrupt) {
  84            env->lock_addr = -1;
  85        }
  86    }
  87}
  88
  89void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
  90{
  91    int i;
  92
  93    for(i = 0; i < 16; i++) {
  94        env->gregs[i] = regs->regs[i];
  95    }
  96    env->pc = regs->pc;
  97}
  98