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 } 59