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_ILLEGAL:
  40         case EXCP_LINEA:
  41         case EXCP_LINEF:
  42             force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPN, env->pc);
  43             break;
  44         case EXCP_CHK:
  45         case EXCP_TRAPCC:
  46             force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTOVF, env->mmu.ar);
  47             break;
  48         case EXCP_DIV0:
  49             force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTDIV, env->mmu.ar);
  50             break;
  51         case EXCP_TRACE:
  52             force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_TRACE, env->mmu.ar);
  53             break;
  54         case EXCP_TRAP0:
  55             {
  56                 abi_long ret;
  57                 n = env->dregs[0];
  58                 ret = do_syscall(env,
  59                                  n,
  60                                  env->dregs[1],
  61                                  env->dregs[2],
  62                                  env->dregs[3],
  63                                  env->dregs[4],
  64                                  env->dregs[5],
  65                                  env->aregs[0],
  66                                  0, 0);
  67                 if (ret == -QEMU_ERESTARTSYS) {
  68                     env->pc -= 2;
  69                 } else if (ret != -QEMU_ESIGRETURN) {
  70                     env->dregs[0] = ret;
  71                 }
  72             }
  73             break;
  74         case EXCP_INTERRUPT:
  75             /* just indicate that signals should be handled asap */
  76             break;
  77         case EXCP_TRAP0 + 1 ... EXCP_TRAP0 + 14:
  78             force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLTRP, env->pc);
  79             break;
  80         case EXCP_DEBUG:
  81         case EXCP_TRAP15:
  82             force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
  83             break;
  84         case EXCP_ATOMIC:
  85             cpu_exec_step_atomic(cs);
  86             break;
  87         default:
  88             EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
  89             abort();
  90         }
  91         process_pending_signals(env);
  92     }
  93 }
  94
  95 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
  96 {
  97     CPUState *cpu = env_cpu(env);
  98     TaskState *ts = get_task_state(cpu);
  99     struct image_info *info = ts->info;
 100
 101     env->pc = regs->pc;
 102     env->dregs[0] = regs->d0;
 103     env->dregs[1] = regs->d1;
 104     env->dregs[2] = regs->d2;
 105     env->dregs[3] = regs->d3;
 106     env->dregs[4] = regs->d4;
 107     env->dregs[5] = regs->d5;
 108     env->dregs[6] = regs->d6;
 109     env->dregs[7] = regs->d7;
 110     env->aregs[0] = regs->a0;
 111     env->aregs[1] = regs->a1;
 112     env->aregs[2] = regs->a2;
 113     env->aregs[3] = regs->a3;
 114     env->aregs[4] = regs->a4;
 115     env->aregs[5] = regs->a5;
 116     env->aregs[6] = regs->a6;
 117     env->aregs[7] = regs->usp;
 118     env->sr = regs->sr;
 119
 120     ts->stack_base = info->start_stack;
 121     ts->heap_base = info->brk;
 122     /* This will be filled in on the first SYS_HEAPINFO call.  */
 123     ts->heap_limit = 0;
 124 }