From 5abf9495ca9ff41160260ac274115825c10545cc Mon Sep 17 00:00:00 2001 From: Peter Crosthwaite Date: Thu, 10 Sep 2015 22:39:31 -0700 Subject: cpu-exec: Migrate some generic fns to cpu-exec-common The goal is to split the functions such that cpu-exec is CPU specific content, while cpus-exec-common.c is generic code only. The function interface to cpu-exec needs to be virtualised to prepare support for multi-arch and moving these definitions out saves bloating the QOM interface. So move these definitions out of cpu-exec to a new module, cpu-exec-common. Signed-off-by: Peter Crosthwaite Message-Id: <3cefeb3fbbb33031670951a0e74de2778529da3f.1441614289.git.crosthwaite.peter@gmail.com> Signed-off-by: Paolo Bonzini --- cpu-exec-common.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 81 insertions(+) create mode 100644 cpu-exec-common.c (limited to 'cpu-exec-common.c') diff --git a/cpu-exec-common.c b/cpu-exec-common.c new file mode 100644 index 0000000000..16d305b911 --- /dev/null +++ b/cpu-exec-common.c @@ -0,0 +1,81 @@ +/* + * 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 . + */ + +#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); +} -- cgit v1.2.1