mirror of https://gitee.com/openkylin/qemu.git
82 lines
2.4 KiB
C
82 lines
2.4 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_reload_memory_map(CPUState *cpu)
|
|
{
|
|
AddressSpaceDispatch *d;
|
|
|
|
if (qemu_in_vcpu_thread()) {
|
|
/* Do not let the guest prolong the critical section as much as it
|
|
* as it desires.
|
|
*
|
|
* Currently, this is prevented by the I/O thread's periodinc kicking
|
|
* of the VCPU thread (iothread_requesting_mutex, qemu_cpu_kick_thread)
|
|
* but this will go away once TCG's execution moves out of the global
|
|
* mutex.
|
|
*
|
|
* This pair matches cpu_exec's rcu_read_lock()/rcu_read_unlock(), which
|
|
* only protects cpu->as->dispatch. Since we reload it below, we can
|
|
* split the critical section.
|
|
*/
|
|
rcu_read_unlock();
|
|
rcu_read_lock();
|
|
}
|
|
|
|
/* The CPU and TLB are protected by the iothread lock. */
|
|
d = atomic_rcu_read(&cpu->as->dispatch);
|
|
cpu->memory_dispatch = d;
|
|
tlb_flush(cpu, 1);
|
|
}
|
|
#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);
|
|
}
|