2015-09-11 08:39:31 +03:00
|
|
|
/*
|
|
|
|
* emulator main execution loop
|
|
|
|
*
|
|
|
|
* Copyright (c) 2003-2005 Fabrice Bellard
|
|
|
|
*
|
|
|
|
* This library is free software; you can redistribute it and/or
|
|
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
|
|
* License as published by the Free Software Foundation; either
|
2019-01-23 17:08:56 +03:00
|
|
|
* version 2.1 of the License, or (at your option) any later version.
|
2015-09-11 08:39:31 +03:00
|
|
|
*
|
|
|
|
* This library is distributed in the hope that it will be useful,
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
|
* Lesser General Public License for more details.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
|
|
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
|
|
|
|
*/
|
|
|
|
|
2016-01-26 21:16:56 +03:00
|
|
|
#include "qemu/osdep.h"
|
2015-09-11 08:39:31 +03:00
|
|
|
#include "sysemu/cpus.h"
|
2019-05-23 17:35:05 +03:00
|
|
|
#include "sysemu/tcg.h"
|
2016-03-15 15:18:37 +03:00
|
|
|
#include "exec/exec-all.h"
|
2015-09-11 08:39:31 +03:00
|
|
|
|
2017-07-03 13:12:12 +03:00
|
|
|
bool tcg_allowed;
|
|
|
|
|
2016-05-17 17:18:04 +03:00
|
|
|
/* exit the current TB, but without causing any exception to be raised */
|
|
|
|
void cpu_loop_exit_noexc(CPUState *cpu)
|
2015-09-11 08:39:31 +03:00
|
|
|
{
|
|
|
|
cpu->exception_index = -1;
|
2018-04-09 12:13:20 +03:00
|
|
|
cpu_loop_exit(cpu);
|
2015-09-11 08:39:31 +03:00
|
|
|
}
|
|
|
|
|
2016-05-17 17:18:03 +03:00
|
|
|
#if defined(CONFIG_SOFTMMU)
|
2015-10-01 17:29:50 +03:00
|
|
|
void cpu_reloading_memory_map(void)
|
2015-09-11 08:39:31 +03:00
|
|
|
{
|
2017-03-22 19:11:13 +03:00
|
|
|
if (qemu_in_vcpu_thread() && current_cpu->running) {
|
2015-10-01 17:29:49 +03:00
|
|
|
/* The guest can in theory prolong the RCU critical section as long
|
|
|
|
* as it feels like. The major problem with this is that because it
|
|
|
|
* can do multiple reconfigurations of the memory map within the
|
|
|
|
* critical section, we could potentially accumulate an unbounded
|
|
|
|
* collection of memory data structures awaiting reclamation.
|
2015-09-11 08:39:31 +03:00
|
|
|
*
|
2015-10-01 17:29:49 +03:00
|
|
|
* Because the only thing we're currently protecting with RCU is the
|
|
|
|
* memory data structures, it's sufficient to break the critical section
|
|
|
|
* in this callback, which we know will get called every time the
|
|
|
|
* memory map is rearranged.
|
|
|
|
*
|
|
|
|
* (If we add anything else in the system that uses RCU to protect
|
|
|
|
* its data structures, we will need to implement some other mechanism
|
|
|
|
* to force TCG CPUs to exit the critical section, at which point this
|
|
|
|
* part of this callback might become unnecessary.)
|
2015-09-11 08:39:31 +03:00
|
|
|
*
|
|
|
|
* This pair matches cpu_exec's rcu_read_lock()/rcu_read_unlock(), which
|
2015-10-01 17:29:50 +03:00
|
|
|
* only protects cpu->as->dispatch. Since we know our caller is about
|
|
|
|
* to reload it, it's safe to split the critical section.
|
2015-09-11 08:39:31 +03:00
|
|
|
*/
|
|
|
|
rcu_read_unlock();
|
|
|
|
rcu_read_lock();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
void cpu_loop_exit(CPUState *cpu)
|
|
|
|
{
|
2018-04-09 12:13:20 +03:00
|
|
|
/* Undo the setting in cpu_tb_exec. */
|
|
|
|
cpu->can_do_io = 1;
|
2015-09-11 08:39:31 +03:00
|
|
|
siglongjmp(cpu->jmp_env, 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
void cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc)
|
|
|
|
{
|
|
|
|
if (pc) {
|
2022-10-24 16:09:57 +03:00
|
|
|
cpu_restore_state(cpu, pc);
|
2015-09-11 08:39:31 +03:00
|
|
|
}
|
2018-04-09 12:13:20 +03:00
|
|
|
cpu_loop_exit(cpu);
|
2015-09-11 08:39:31 +03:00
|
|
|
}
|
2016-06-30 08:12:55 +03:00
|
|
|
|
|
|
|
void cpu_loop_exit_atomic(CPUState *cpu, uintptr_t pc)
|
|
|
|
{
|
|
|
|
cpu->exception_index = EXCP_ATOMIC;
|
|
|
|
cpu_loop_exit_restore(cpu, pc);
|
|
|
|
}
|