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     target_siginfo_t info;
  33
  34     for(;;) {
  35         cpu_exec_start(cs);
  36         trapnr = cpu_exec(cs);
  37         cpu_exec_end(cs);
  38         process_queued_cpu_work(cs);
  39
  40         switch(trapnr) {
  41         case EXCP_HALT_INSN:
  42             /* Semihosing syscall.  */
  43             env->pc += 4;
  44             do_m68k_semihosting(env, env->dregs[0]);
  45             break;
  46         case EXCP_ILLEGAL:
  47         case EXCP_LINEA:
  48         case EXCP_LINEF:
  49             info.si_signo = TARGET_SIGILL;
  50             info.si_errno = 0;
  51             info.si_code = TARGET_ILL_ILLOPN;
  52             info._sifields._sigfault._addr = env->pc;
  53             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  54             break;
  55         case EXCP_CHK:
  56             info.si_signo = TARGET_SIGFPE;
  57             info.si_errno = 0;
  58             info.si_code = TARGET_FPE_INTOVF;
  59             info._sifields._sigfault._addr = env->pc;
  60             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  61             break;
  62         case EXCP_DIV0:
  63             info.si_signo = TARGET_SIGFPE;
  64             info.si_errno = 0;
  65             info.si_code = TARGET_FPE_INTDIV;
  66             info._sifields._sigfault._addr = env->pc;
  67             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  68             break;
  69         case EXCP_TRAP0:
  70             {
  71                 abi_long ret;
  72                 n = env->dregs[0];
  73                 env->pc += 2;
  74                 ret = do_syscall(env,
  75                                  n,
  76                                  env->dregs[1],
  77                                  env->dregs[2],
  78                                  env->dregs[3],
  79                                  env->dregs[4],
  80                                  env->dregs[5],
  81                                  env->aregs[0],
  82                                  0, 0);
  83                 if (ret == -TARGET_ERESTARTSYS) {
  84                     env->pc -= 2;
  85                 } else if (ret != -TARGET_QEMU_ESIGRETURN) {
  86                     env->dregs[0] = ret;
  87                 }
  88             }
  89             break;
  90         case EXCP_INTERRUPT:
  91             /* just indicate that signals should be handled asap */
  92             break;
  93         case EXCP_DEBUG:
  94             info.si_signo = TARGET_SIGTRAP;
  95             info.si_errno = 0;
  96             info.si_code = TARGET_TRAP_BRKPT;
  97             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  98             break;
  99         case EXCP_ATOMIC:
 100             cpu_exec_step_atomic(cs);
 101             break;
 102         default:
 103             EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
 104             abort();
 105         }
 106         process_pending_signals(env);
 107     }
 108 }
 109
 110 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 111 {
 112     CPUState *cpu = env_cpu(env);
 113     TaskState *ts = cpu->opaque;
 114     struct image_info *info = ts->info;
 115
 116     env->pc = regs->pc;
 117     env->dregs[0] = regs->d0;
 118     env->dregs[1] = regs->d1;
 119     env->dregs[2] = regs->d2;
 120     env->dregs[3] = regs->d3;
 121     env->dregs[4] = regs->d4;
 122     env->dregs[5] = regs->d5;
 123     env->dregs[6] = regs->d6;
 124     env->dregs[7] = regs->d7;
 125     env->aregs[0] = regs->a0;
 126     env->aregs[1] = regs->a1;
 127     env->aregs[2] = regs->a2;
 128     env->aregs[3] = regs->a3;
 129     env->aregs[4] = regs->a4;
 130     env->aregs[5] = regs->a5;
 131     env->aregs[6] = regs->a6;
 132     env->aregs[7] = regs->usp;
 133     env->sr = regs->sr;
 134
 135     ts->stack_base = info->start_stack;
 136     ts->heap_base = info->brk;
 137     /* This will be filled in on the first SYS_HEAPINFO call.  */
 138     ts->heap_limit = 0;
 139 }