void cpu_loop(CPUM68KState *env) { CPUState *cs = CPU(m68k_env_get_cpu(env)); int trapnr; unsigned int n; target_siginfo_t info; TaskState *ts = cs->opaque; for(;;) { cpu_exec_start(cs); trapnr = cpu_exec(cs); cpu_exec_end(cs); process_queued_cpu_work(cs); switch(trapnr) { case EXCP_ILLEGAL: { if (ts->sim_syscalls) { uint16_t nr; get_user_u16(nr, env->pc + 2); env->pc += 4; do_m68k_simcall(env, nr); } else { goto do_sigill; } } case EXCP_HALT_INSN: /* Semihosing syscall. */ env->pc += 4; do_m68k_semihosting(env, env->dregs[0]); case EXCP_LINEA: case EXCP_LINEF: case EXCP_UNSUPPORTED: do_sigill: info.si_signo = TARGET_SIGILL; info.si_code = TARGET_ILL_ILLOPN; case EXCP_TRAP0: { abi_long ret; ts->sim_syscalls = 0; n = env->dregs[0]; env->pc += 2; ret = do_syscall(env, n, env->dregs[1], env->dregs[2], env->dregs[3], env->dregs[4], env->dregs[5], env->aregs[0], 0, 0); if (ret == -TARGET_ERESTARTSYS) { env->pc -= 2; } else if (ret != -TARGET_QEMU_ESIGRETURN) { env->dregs[0] = ret; } } case EXCP_INTERRUPT: /* just indicate that signals should be handled asap */ case EXCP_ACCESS: { info.si_signo = TARGET_SIGSEGV; /* XXX: check env->error_code */ info.si_code = TARGET_SEGV_MAPERR; info._sifields._sigfault._addr = env->mmu.ar; } case EXCP_DEBUG: { int sig; sig = gdb_handlesig(cs, TARGET_SIGTRAP); if (sig) { info.si_signo = sig; info.si_code = TARGET_TRAP_BRKPT; } } case EXCP_ATOMIC: cpu_exec_step_atomic(cs); default: EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr); abort(); } process_pending_signals(env); } }