accel/tcg/cpu-exec-common.c

   1 /*
   2  *  emulator main execution loop
   3  *
   4  *  Copyright (c) 2003-2005 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "sysemu/cpus.h"
  22 #include "sysemu/tcg.h"
  23 #include "qemu/plugin.h"
  24 #include "internal-common.h"
  25
  26 bool tcg_allowed;
  27
  28 /* exit the current TB, but without causing any exception to be raised */
  29 void cpu_loop_exit_noexc(CPUState *cpu)
  30 {
  31     cpu->exception_index = -1;
  32     cpu_loop_exit(cpu);
  33 }
  34
  35 void cpu_loop_exit(CPUState *cpu)
  36 {
  37     /* Undo the setting in cpu_tb_exec.  */
  38     cpu->neg.can_do_io = true;
  39     /* Undo any setting in generated code.  */
  40     qemu_plugin_disable_mem_helpers(cpu);
  41     siglongjmp(cpu->jmp_env, 1);
  42 }
  43
  44 void cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc)
  45 {
  46     if (pc) {
  47         cpu_restore_state(cpu, pc);
  48     }
  49     cpu_loop_exit(cpu);
  50 }
  51
  52 void cpu_loop_exit_atomic(CPUState *cpu, uintptr_t pc)
  53 {
  54     /* Prevent looping if already executing in a serial context. */
  55     g_assert(!cpu_in_serial_context(cpu));
  56     cpu->exception_index = EXCP_ATOMIC;
  57     cpu_loop_exit_restore(cpu, pc);
  58 }