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 "cpu_loop-common.h"
  23
  24 void 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             {
  61                 int sig;
  62
  63                 sig = gdb_handlesig(cs, TARGET_SIGTRAP);
  64                 if (sig) {
  65                     info.si_signo = sig;
  66                     info.si_errno = 0;
  67                     info.si_code = TARGET_TRAP_BRKPT;
  68                     queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  69                 } else {
  70                     arch_interrupt = false;
  71                 }
  72             }
  73             break;
  74         case 0xa0:
  75         case 0xc0:
  76             info.si_signo = TARGET_SIGSEGV;
  77             info.si_errno = 0;
  78             info.si_code = TARGET_SEGV_MAPERR;
  79             info._sifields._sigfault._addr = env->tea;
  80             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  81             break;
  82         case EXCP_ATOMIC:
  83             cpu_exec_step_atomic(cs);
  84             arch_interrupt = false;
  85             break;
  86         default:
  87             fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
  88             cpu_dump_state(cs, stderr, fprintf, 0);
  89             exit(EXIT_FAILURE);
  90         }
  91         process_pending_signals (env);
  92
  93         /* Most of the traps imply an exception or interrupt, which
  94            implies an REI instruction has been executed.  Which means
  95            that LDST (aka LOK_ADDR) should be cleared.  But there are
  96            a few exceptions for traps internal to QEMU.  */
  97         if (arch_interrupt) {
  98             env->lock_addr = -1;
  99         }
 100     }
 101 }
 102
 103 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 104 {
 105     int i;
 106
 107     for(i = 0; i < 16; i++) {
 108         env->gregs[i] = regs->regs[i];
 109     }
 110     env->pc = regs->pc;
 111 }