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 } 60