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 "cpu_loop-common.h"
  23
  24void cpu_loop(CPUSH4State *env)
  25{
  26    CPUState *cs = CPU(sh_env_get_cpu(env));
  27    int trapnr, ret;
  28    target_siginfo_t info;
  29
  30    while (1) {
  31        bool arch_interrupt = true;
  32
  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 0x160:
  40            env->pc += 2;
  41            ret = do_syscall(env,
  42                             env->gregs[3],
  43                             env->gregs[4],
  44                             env->gregs[5],
  45                             env->gregs[6],
  46                             env->gregs[7],
  47                             env->gregs[0],
  48                             env->gregs[1],
  49                             0, 0);
  50            if (ret == -TARGET_ERESTARTSYS) {
  51                env->pc -= 2;
  52            } else if (ret != -TARGET_QEMU_ESIGRETURN) {
  53                env->gregs[0] = ret;
  54            }
  55            break;
  56        case EXCP_INTERRUPT:
  57            /* just indicate that signals should be handled asap */
  58            break;
  59        case EXCP_DEBUG:
  60            info.si_signo = TARGET_SIGTRAP;
  61            info.si_errno = 0;
  62            info.si_code = TARGET_TRAP_BRKPT;
  63            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  64            break;
  65        case 0xa0:
  66        case 0xc0:
  67            info.si_signo = TARGET_SIGSEGV;
  68            info.si_errno = 0;
  69            info.si_code = TARGET_SEGV_MAPERR;
  70            info._sifields._sigfault._addr = env->tea;
  71            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  72            break;
  73        case EXCP_ATOMIC:
  74            cpu_exec_step_atomic(cs);
  75            arch_interrupt = false;
  76            break;
  77        default:
  78            fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
  79            cpu_dump_state(cs, stderr, fprintf, 0);
  80            exit(EXIT_FAILURE);
  81        }
  82        process_pending_signals (env);
  83
  84        /* Most of the traps imply an exception or interrupt, which
  85           implies an REI instruction has been executed.  Which means
  86           that LDST (aka LOK_ADDR) should be cleared.  But there are
  87           a few exceptions for traps internal to QEMU.  */
  88        if (arch_interrupt) {
  89            env->lock_addr = -1;
  90        }
  91    }
  92}
  93
  94void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
  95{
  96    int i;
  97
  98    for(i = 0; i < 16; i++) {
  99        env->gregs[i] = regs->regs[i];
 100    }
 101    env->pc = regs->pc;
 102}
 103