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 "exec/exec-all.h"
  24 #include "qemu/plugin.h"
  25 #include "internal.h"
  26
  27 bool tcg_allowed;
  28
  29 /* exit the current TB, but without causing any exception to be raised */
  30 void cpu_loop_exit_noexc(CPUState *cpu)
  31 {
  32     cpu->exception_index = -1;
  33     cpu_loop_exit(cpu);
  34 }
  35
  36 void cpu_loop_exit(CPUState *cpu)
  37 {
  38     /* Undo the setting in cpu_tb_exec.  */
  39     cpu->can_do_io = 1;
  40     /* Undo any setting in generated code.  */
  41     qemu_plugin_disable_mem_helpers(cpu);
  42     siglongjmp(cpu->jmp_env, 1);
  43 }
  44
  45 void cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc)
  46 {
  47     if (pc) {
  48         cpu_restore_state(cpu, pc);
  49     }
  50     cpu_loop_exit(cpu);
  51 }
  52
  53 void cpu_loop_exit_atomic(CPUState *cpu, uintptr_t pc)
  54 {
  55     /* Prevent looping if already executing in a serial context. */
  56     g_assert(!cpu_in_serial_context(cpu));
  57     cpu->exception_index = EXCP_ATOMIC;
  58     cpu_loop_exit_restore(cpu, pc);
  59 }