static void cpu_exec_step(CPUState *cpu) { CPUClass *cc = CPU_GET_CLASS(cpu); TranslationBlock *tb; target_ulong cs_base, pc; uint32_t flags; uint32_t cflags = 1 | CF_IGNORE_ICOUNT; if (sigsetjmp(cpu->jmp_env, 0) == 0) { tb = tb_lookup__cpu_state(cpu, &pc, &cs_base, &flags, cflags & CF_HASH_MASK); if (tb == NULL) { mmap_lock(); tb_lock(); tb = tb_gen_code(cpu, pc, cs_base, flags, cflags); tb_unlock(); mmap_unlock(); } cc->cpu_exec_enter(cpu); /* execute the generated code */ trace_exec_tb(tb, pc); cpu_tb_exec(cpu, tb); cc->cpu_exec_exit(cpu); } else { /* We may have exited due to another problem here, so we need * to reset any tb_locks we may have taken but didn't release. * The mmap_lock is dropped by tb_gen_code if it runs out of * memory. */ #ifndef CONFIG_SOFTMMU tcg_debug_assert(!have_mmap_lock()); #endif tb_lock_reset(); } }