linux-user/sh4/cpu_loop.c

   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
  26 void 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
  84 void 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 }