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-common.h"
  22 #include "qemu.h"
  23 #include "user-internals.h"
  24 #include "cpu_loop-common.h"
  25 #include "signal-common.h"
  26
  27 void cpu_loop(CPUM68KState *env)
  28 {
  29     CPUState *cs = env_cpu(env);
  30     int trapnr;
  31     unsigned int n;
  32
  33     for(;;) {
  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 EXCP_HALT_INSN:
  41             /* Semihosing syscall.  */
  42             env->pc += 4;
  43             do_m68k_semihosting(env, env->dregs[0]);
  44             break;
  45         case EXCP_ILLEGAL:
  46         case EXCP_LINEA:
  47         case EXCP_LINEF:
  48             force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPN, env->pc);
  49             break;
  50         case EXCP_CHK:
  51             force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTOVF, env->pc);
  52             break;
  53         case EXCP_DIV0:
  54             force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTDIV, env->pc);
  55             break;
  56         case EXCP_TRAP0:
  57             {
  58                 abi_long ret;
  59                 n = env->dregs[0];
  60                 env->pc += 2;
  61                 ret = do_syscall(env,
  62                                  n,
  63                                  env->dregs[1],
  64                                  env->dregs[2],
  65                                  env->dregs[3],
  66                                  env->dregs[4],
  67                                  env->dregs[5],
  68                                  env->aregs[0],
  69                                  0, 0);
  70                 if (ret == -QEMU_ERESTARTSYS) {
  71                     env->pc -= 2;
  72                 } else if (ret != -QEMU_ESIGRETURN) {
  73                     env->dregs[0] = ret;
  74                 }
  75             }
  76             break;
  77         case EXCP_INTERRUPT:
  78             /* just indicate that signals should be handled asap */
  79             break;
  80         case EXCP_DEBUG:
  81             force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
  82             break;
  83         case EXCP_ATOMIC:
  84             cpu_exec_step_atomic(cs);
  85             break;
  86         default:
  87             EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
  88             abort();
  89         }
  90         process_pending_signals(env);
  91     }
  92 }
  93
  94 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
  95 {
  96     CPUState *cpu = env_cpu(env);
  97     TaskState *ts = cpu->opaque;
  98     struct image_info *info = ts->info;
  99
 100     env->pc = regs->pc;
 101     env->dregs[0] = regs->d0;
 102     env->dregs[1] = regs->d1;
 103     env->dregs[2] = regs->d2;
 104     env->dregs[3] = regs->d3;
 105     env->dregs[4] = regs->d4;
 106     env->dregs[5] = regs->d5;
 107     env->dregs[6] = regs->d6;
 108     env->dregs[7] = regs->d7;
 109     env->aregs[0] = regs->a0;
 110     env->aregs[1] = regs->a1;
 111     env->aregs[2] = regs->a2;
 112     env->aregs[3] = regs->a3;
 113     env->aregs[4] = regs->a4;
 114     env->aregs[5] = regs->a5;
 115     env->aregs[6] = regs->a6;
 116     env->aregs[7] = regs->usp;
 117     env->sr = regs->sr;
 118
 119     ts->stack_base = info->start_stack;
 120     ts->heap_base = info->brk;
 121     /* This will be filled in on the first SYS_HEAPINFO call.  */
 122     ts->heap_limit = 0;
 123 }