tcg: Merge tb_find_slow() and tb_find_fast()
These functions are not too big and can be merged together. This makes locking scheme more clear and easier to follow. Signed-off-by: Sergey Fedorov <serge.fdrv@gmail.com> Signed-off-by: Sergey Fedorov <sergey.fedorov@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20160715175852.30749-12-sergey.fedorov@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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74d356dd48
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72
cpu-exec.c
72
cpu-exec.c
@ -279,45 +279,9 @@ static TranslationBlock *tb_find_physical(CPUState *cpu,
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return qht_lookup(&tcg_ctx.tb_ctx.htable, tb_cmp, &desc, h);
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}
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static TranslationBlock *tb_find_slow(CPUState *cpu,
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target_ulong pc,
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target_ulong cs_base,
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uint32_t flags,
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bool *have_tb_lock)
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{
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TranslationBlock *tb;
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tb = tb_find_physical(cpu, pc, cs_base, flags);
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if (!tb) {
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/* mmap_lock is needed by tb_gen_code, and mmap_lock must be
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* taken outside tb_lock. As system emulation is currently
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* single threaded the locks are NOPs.
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*/
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mmap_lock();
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tb_lock();
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*have_tb_lock = true;
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/* There's a chance that our desired tb has been translated while
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* taking the locks so we check again inside the lock.
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*/
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tb = tb_find_physical(cpu, pc, cs_base, flags);
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if (!tb) {
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/* if no translated code available, then translate it now */
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tb = tb_gen_code(cpu, pc, cs_base, flags, 0);
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}
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mmap_unlock();
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}
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/* We add the TB in the virtual pc hash table for the fast lookup */
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atomic_set(&cpu->tb_jmp_cache[tb_jmp_cache_hash_func(pc)], tb);
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return tb;
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}
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static inline TranslationBlock *tb_find_fast(CPUState *cpu,
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TranslationBlock *last_tb,
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int tb_exit)
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static inline TranslationBlock *tb_find(CPUState *cpu,
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TranslationBlock *last_tb,
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int tb_exit)
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{
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CPUArchState *env = (CPUArchState *)cpu->env_ptr;
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TranslationBlock *tb;
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@ -332,7 +296,31 @@ static inline TranslationBlock *tb_find_fast(CPUState *cpu,
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tb = atomic_rcu_read(&cpu->tb_jmp_cache[tb_jmp_cache_hash_func(pc)]);
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if (unlikely(!tb || tb->pc != pc || tb->cs_base != cs_base ||
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tb->flags != flags)) {
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tb = tb_find_slow(cpu, pc, cs_base, flags, &have_tb_lock);
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tb = tb_find_physical(cpu, pc, cs_base, flags);
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if (!tb) {
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/* mmap_lock is needed by tb_gen_code, and mmap_lock must be
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* taken outside tb_lock. As system emulation is currently
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* single threaded the locks are NOPs.
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*/
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mmap_lock();
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tb_lock();
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have_tb_lock = true;
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/* There's a chance that our desired tb has been translated while
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* taking the locks so we check again inside the lock.
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*/
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tb = tb_find_physical(cpu, pc, cs_base, flags);
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if (!tb) {
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/* if no translated code available, then translate it now */
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tb = tb_gen_code(cpu, pc, cs_base, flags, 0);
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}
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mmap_unlock();
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}
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/* We add the TB in the virtual pc hash table for the fast lookup */
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atomic_set(&cpu->tb_jmp_cache[tb_jmp_cache_hash_func(pc)], tb);
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}
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#ifndef CONFIG_USER_ONLY
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/* We don't take care of direct jumps when address mapping changes in
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@ -437,7 +425,7 @@ static inline bool cpu_handle_exception(CPUState *cpu, int *ret)
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} else if (replay_has_exception()
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&& cpu->icount_decr.u16.low + cpu->icount_extra == 0) {
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/* try to cause an exception pending in the log */
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cpu_exec_nocache(cpu, 1, tb_find_fast(cpu, NULL, 0), true);
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cpu_exec_nocache(cpu, 1, tb_find(cpu, NULL, 0), true);
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*ret = -1;
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return true;
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#endif
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@ -620,7 +608,7 @@ int cpu_exec(CPUState *cpu)
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atomic_mb_set(&cpu->tb_flushed, false); /* reset before first TB lookup */
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for(;;) {
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cpu_handle_interrupt(cpu, &last_tb);
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tb = tb_find_fast(cpu, last_tb, tb_exit);
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tb = tb_find(cpu, last_tb, tb_exit);
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cpu_loop_exec_tb(cpu, tb, &last_tb, &tb_exit, &sc);
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/* Try to align the host and virtual clocks
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if the guest is in advance */
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