83 lines
2.8 KiB
C
83 lines
2.8 KiB
C
/*
|
|
* 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
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* 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/>.
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include "cpu.h"
|
|
#include "sysemu/cpus.h"
|
|
#include "exec/memory-internal.h"
|
|
|
|
bool exit_request;
|
|
CPUState *tcg_current_cpu;
|
|
|
|
/* exit the current TB from a signal handler. The host registers are
|
|
restored in a state compatible with the CPU emulator
|
|
*/
|
|
#if defined(CONFIG_SOFTMMU)
|
|
void cpu_resume_from_signal(CPUState *cpu, void *puc)
|
|
{
|
|
/* XXX: restore cpu registers saved in host registers */
|
|
|
|
cpu->exception_index = -1;
|
|
siglongjmp(cpu->jmp_env, 1);
|
|
}
|
|
|
|
void cpu_reloading_memory_map(void)
|
|
{
|
|
if (qemu_in_vcpu_thread()) {
|
|
/* 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.
|
|
*
|
|
* 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.)
|
|
*
|
|
* This pair matches cpu_exec's rcu_read_lock()/rcu_read_unlock(), which
|
|
* only protects cpu->as->dispatch. Since we know our caller is about
|
|
* to reload it, it's safe to split the critical section.
|
|
*/
|
|
rcu_read_unlock();
|
|
rcu_read_lock();
|
|
}
|
|
}
|
|
#endif
|
|
|
|
void cpu_loop_exit(CPUState *cpu)
|
|
{
|
|
cpu->current_tb = NULL;
|
|
siglongjmp(cpu->jmp_env, 1);
|
|
}
|
|
|
|
void cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc)
|
|
{
|
|
if (pc) {
|
|
cpu_restore_state(cpu, pc);
|
|
}
|
|
cpu->current_tb = NULL;
|
|
siglongjmp(cpu->jmp_env, 1);
|
|
}
|