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 "cpu_loop-common.h"
  24
  25 void cpu_loop(CPUM68KState *env)
  26 {
  27     CPUState *cs = env_cpu(env);
  28     int trapnr;
  29     unsigned int n;
  30     target_siginfo_t info;
  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             info.si_signo = TARGET_SIGILL;
  48             info.si_errno = 0;
  49             info.si_code = TARGET_ILL_ILLOPN;
  50             info._sifields._sigfault._addr = env->pc;
  51             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  52             break;
  53         case EXCP_CHK:
  54             info.si_signo = TARGET_SIGFPE;
  55             info.si_errno = 0;
  56             info.si_code = TARGET_FPE_INTOVF;
  57             info._sifields._sigfault._addr = env->pc;
  58             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  59             break;
  60         case EXCP_DIV0:
  61             info.si_signo = TARGET_SIGFPE;
  62             info.si_errno = 0;
  63             info.si_code = TARGET_FPE_INTDIV;
  64             info._sifields._sigfault._addr = env->pc;
  65             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  66             break;
  67         case EXCP_TRAP0:
  68             {
  69                 abi_long ret;
  70                 n = env->dregs[0];
  71                 env->pc += 2;
  72                 ret = do_syscall(env,
  73                                  n,
  74                                  env->dregs[1],
  75                                  env->dregs[2],
  76                                  env->dregs[3],
  77                                  env->dregs[4],
  78                                  env->dregs[5],
  79                                  env->aregs[0],
  80                                  0, 0);
  81                 if (ret == -TARGET_ERESTARTSYS) {
  82                     env->pc -= 2;
  83                 } else if (ret != -TARGET_QEMU_ESIGRETURN) {
  84                     env->dregs[0] = ret;
  85                 }
  86             }
  87             break;
  88         case EXCP_INTERRUPT:
  89             /* just indicate that signals should be handled asap */
  90             break;
  91         case EXCP_ACCESS:
  92             {
  93                 info.si_signo = TARGET_SIGSEGV;
  94                 info.si_errno = 0;
  95                 /* XXX: check env->error_code */
  96                 info.si_code = TARGET_SEGV_MAPERR;
  97                 info._sifields._sigfault._addr = env->mmu.ar;
  98                 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  99             }
 100             break;
 101         case EXCP_DEBUG:
 102             info.si_signo = TARGET_SIGTRAP;
 103             info.si_errno = 0;
 104             info.si_code = TARGET_TRAP_BRKPT;
 105             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
 106             break;
 107         case EXCP_ATOMIC:
 108             cpu_exec_step_atomic(cs);
 109             break;
 110         default:
 111             EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
 112             abort();
 113         }
 114         process_pending_signals(env);
 115     }
 116 }
 117
 118 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 119 {
 120     CPUState *cpu = env_cpu(env);
 121     TaskState *ts = cpu->opaque;
 122     struct image_info *info = ts->info;
 123
 124     env->pc = regs->pc;
 125     env->dregs[0] = regs->d0;
 126     env->dregs[1] = regs->d1;
 127     env->dregs[2] = regs->d2;
 128     env->dregs[3] = regs->d3;
 129     env->dregs[4] = regs->d4;
 130     env->dregs[5] = regs->d5;
 131     env->dregs[6] = regs->d6;
 132     env->dregs[7] = regs->d7;
 133     env->aregs[0] = regs->a0;
 134     env->aregs[1] = regs->a1;
 135     env->aregs[2] = regs->a2;
 136     env->aregs[3] = regs->a3;
 137     env->aregs[4] = regs->a4;
 138     env->aregs[5] = regs->a5;
 139     env->aregs[6] = regs->a6;
 140     env->aregs[7] = regs->usp;
 141     env->sr = regs->sr;
 142
 143     ts->stack_base = info->start_stack;
 144     ts->heap_base = info->brk;
 145     /* This will be filled in on the first SYS_HEAPINFO call.  */
 146     ts->heap_limit = 0;
 147 }