linux-user/m68k/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(CPUM68KState *env)
  27 {
  28     CPUState *cs = env_cpu(env);
  29     int trapnr;
  30     unsigned int n;
  31
  32     for(;;) {
  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 EXCP_HALT_INSN:
  40             /* Semihosing syscall.  */
  41             env->pc += 4;
  42             do_m68k_semihosting(env, env->dregs[0]);
  43             break;
  44         case EXCP_ILLEGAL:
  45         case EXCP_LINEA:
  46         case EXCP_LINEF:
  47             force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPN, env->pc);
  48             break;
  49         case EXCP_CHK:
  50             force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTOVF, env->pc);
  51             break;
  52         case EXCP_DIV0:
  53             force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTDIV, env->pc);
  54             break;
  55         case EXCP_TRAP0:
  56             {
  57                 abi_long ret;
  58                 n = env->dregs[0];
  59                 env->pc += 2;
  60                 ret = do_syscall(env,
  61                                  n,
  62                                  env->dregs[1],
  63                                  env->dregs[2],
  64                                  env->dregs[3],
  65                                  env->dregs[4],
  66                                  env->dregs[5],
  67                                  env->aregs[0],
  68                                  0, 0);
  69                 if (ret == -QEMU_ERESTARTSYS) {
  70                     env->pc -= 2;
  71                 } else if (ret != -QEMU_ESIGRETURN) {
  72                     env->dregs[0] = ret;
  73                 }
  74             }
  75             break;
  76         case EXCP_INTERRUPT:
  77             /* just indicate that signals should be handled asap */
  78             break;
  79         case EXCP_DEBUG:
  80             force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
  81             break;
  82         case EXCP_ATOMIC:
  83             cpu_exec_step_atomic(cs);
  84             break;
  85         default:
  86             EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
  87             abort();
  88         }
  89         process_pending_signals(env);
  90     }
  91 }
  92
  93 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
  94 {
  95     CPUState *cpu = env_cpu(env);
  96     TaskState *ts = cpu->opaque;
  97     struct image_info *info = ts->info;
  98
  99     env->pc = regs->pc;
 100     env->dregs[0] = regs->d0;
 101     env->dregs[1] = regs->d1;
 102     env->dregs[2] = regs->d2;
 103     env->dregs[3] = regs->d3;
 104     env->dregs[4] = regs->d4;
 105     env->dregs[5] = regs->d5;
 106     env->dregs[6] = regs->d6;
 107     env->dregs[7] = regs->d7;
 108     env->aregs[0] = regs->a0;
 109     env->aregs[1] = regs->a1;
 110     env->aregs[2] = regs->a2;
 111     env->aregs[3] = regs->a3;
 112     env->aregs[4] = regs->a4;
 113     env->aregs[5] = regs->a5;
 114     env->aregs[6] = regs->a6;
 115     env->aregs[7] = regs->usp;
 116     env->sr = regs->sr;
 117
 118     ts->stack_base = info->start_stack;
 119     ts->heap_base = info->brk;
 120     /* This will be filled in on the first SYS_HEAPINFO call.  */
 121     ts->heap_limit = 0;
 122 }