82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
/*
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* emulator main execution loop
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*
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* Copyright (c) 2003-2005 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "cpu.h"
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#include "sysemu/cpus.h"
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#include "exec/memory-internal.h"
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bool exit_request;
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CPUState *tcg_current_cpu;
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/* exit the current TB from a signal handler. The host registers are
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restored in a state compatible with the CPU emulator
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*/
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#if defined(CONFIG_SOFTMMU)
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void cpu_resume_from_signal(CPUState *cpu, void *puc)
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{
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/* XXX: restore cpu registers saved in host registers */
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cpu->exception_index = -1;
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siglongjmp(cpu->jmp_env, 1);
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}
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void cpu_reload_memory_map(CPUState *cpu)
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{
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AddressSpaceDispatch *d;
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if (qemu_in_vcpu_thread()) {
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/* Do not let the guest prolong the critical section as much as it
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* as it desires.
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*
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* Currently, this is prevented by the I/O thread's periodinc kicking
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* of the VCPU thread (iothread_requesting_mutex, qemu_cpu_kick_thread)
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* but this will go away once TCG's execution moves out of the global
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* mutex.
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*
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* This pair matches cpu_exec's rcu_read_lock()/rcu_read_unlock(), which
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* only protects cpu->as->dispatch. Since we reload it below, we can
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* split the critical section.
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*/
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rcu_read_unlock();
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rcu_read_lock();
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}
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/* The CPU and TLB are protected by the iothread lock. */
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d = atomic_rcu_read(&cpu->as->dispatch);
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cpu->memory_dispatch = d;
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tlb_flush(cpu, 1);
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}
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#endif
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void cpu_loop_exit(CPUState *cpu)
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{
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cpu->current_tb = NULL;
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siglongjmp(cpu->jmp_env, 1);
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}
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void cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc)
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{
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if (pc) {
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cpu_restore_state(cpu, pc);
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}
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cpu->current_tb = NULL;
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siglongjmp(cpu->jmp_env, 1);
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}
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