예제 #1
0
gpointer
mono_arch_create_handler_block_trampoline (MonoTrampInfo **info, gboolean aot)
{
	guint8 *tramp = mono_get_trampoline_code (MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD);
	guint8 *code, *buf;
	int tramp_size = 64;
	MonoJumpInfo *ji = NULL;
	GSList *unwind_ops = NULL;

	g_assert (!aot);

	code = buf = mono_global_codeman_reserve (tramp_size);

	/*
	 * This trampoline restore the call chain of the handler block 
	 * then jumps into the code that deals with it.
	 */

	if (mono_get_jit_tls_offset () != -1) {
		s390_ear  (code, s390_r1, 0);
		s390_sllg (code, s390_r1, s390_r1, 0, 32);
		s390_ear  (code, s390_r1, 1);
		S390_SET  (code, s390_r14, mono_get_jit_tls_offset());
		s390_lg   (code, s390_r14, s390_r1, 0, G_STRUCT_OFFSET(MonoJitTlsData, handler_block_return_address));
		/* 
		 * Simulate a call 
		 */
		S390_SET  (code, s390_r1, tramp);
		s390_br   (code, s390_r1);
	} else {
		/*
		 * Slow path uses a C helper
		 */
		S390_SET  (code, s390_r2, tramp);
		S390_SET  (code, s390_r1, handler_block_trampoline_helper);
		s390_br	  (code, s390_r1);
	}

	mono_arch_flush_icache (buf, code - buf);

	if (mono_profiler_events & MONO_PROFILE_JIT_COMPILATION)
		mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);

	g_assert (code - buf <= tramp_size);

	*info = mono_tramp_info_create ("handler_block_trampoline", buf, code - buf, ji, unwind_ops);

	return buf;
}
예제 #2
0
gpointer
mono_arch_create_monitor_exit_trampoline (MonoTrampInfo **info, gboolean aot)
{
	guint8	*tramp,
		*code, *buf;
	gint16	*jump_obj_null, 
		*jump_have_waiters, 
		*jump_sync_null, 
		*jump_not_owned, 
		*jump_cs_failed,
		*jump_next,
		*jump_sync_thin_hash = NULL;
	int	tramp_size,
		status_offset, nest_offset;
	MonoJumpInfo *ji = NULL;
	GSList *unwind_ops = NULL;
	int	obj_reg = s390_r2,
		sync_reg = s390_r3,
		status_reg = s390_r4;

	g_assert (obj_reg == MONO_ARCH_MONITOR_OBJECT_REG);

	mono_monitor_threads_sync_members_offset (&status_offset, &nest_offset);
	g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (status_offset) == sizeof (guint32));
	g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (nest_offset) == sizeof (guint32));
	status_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (status_offset);
	nest_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (nest_offset);

	tramp_size = 160;

	code = buf = mono_global_codeman_reserve (tramp_size);

	unwind_ops = mono_arch_get_cie_program ();

	if (mono_thread_get_tls_offset () != -1) {
		/* MonoObject* obj is in obj_reg */
		/* is obj null? */
		s390_ltgr (code, obj_reg, obj_reg);
		/* if yes, jump to actual trampoline */
		s390_jz (code, 0); CODEPTR(code, jump_obj_null);

		/* load obj->synchronization to RCX */
		s390_lg (code, sync_reg, 0, obj_reg, MONO_STRUCT_OFFSET (MonoObject, synchronisation));

		if (mono_gc_is_moving ()) {
			/*if bit zero is set it's a thin hash*/
			s390_tmll (code, sync_reg, 1);
			s390_jo   (code, 0); CODEPTR(code, jump_sync_thin_hash);

			/* Clear bits used by the gc */
			s390_nill (code, sync_reg, ~0x3);
		}

		/* is synchronization null? */
		s390_ltgr (code, sync_reg, sync_reg);
		/* if yes, jump to actual trampoline */
		s390_jz (code, 0); CODEPTR(code, jump_sync_null);

		/* next case: synchronization is not null */
		/* load MonoInternalThread* into r5 */
		s390_ear (code, s390_r5, 0);
		s390_sllg(code, s390_r5, s390_r5, 0, 32);
		s390_ear (code, s390_r5, 1);
		/* load TID into r1 */
		s390_lg  (code, s390_r1, 0, s390_r5, mono_thread_get_tls_offset ());
		s390_lgf (code, s390_r1, 0, s390_r1, MONO_STRUCT_OFFSET (MonoInternalThread, small_id));
		/* is synchronization->owner == TID */
		s390_lgf (code, status_reg, 0, sync_reg, status_offset);
		s390_xr  (code, s390_r1, status_reg);
		s390_tmlh (code, s390_r1, OWNER_MASK);
		/* if not, jump to actual trampoline */
		s390_jno (code, 0); CODEPTR(code, jump_not_owned);

		/* next case: synchronization->owner == TID */
		/* is synchronization->nest == 1 */
		s390_lgf (code, s390_r0, 0, sync_reg, nest_offset);
		s390_chi (code, s390_r0, 1);
		/* if not, jump to next case */
		s390_jne (code, 0); CODEPTR(code, jump_next);
		/* if yes, is synchronization->entry_count greater than zero */
		s390_cfi (code, status_reg, ENTRY_COUNT_WAITERS);
		/* if not, jump to actual trampoline */
		s390_jnz (code, 0); CODEPTR(code, jump_have_waiters);
		/* if yes, try to set synchronization->owner to null and return */
		/* old status in s390_r0 */
		s390_lgfr (code, s390_r0, status_reg);
		/* form new status */
		s390_nilf (code, status_reg, ENTRY_COUNT_MASK);
		/* compare and exchange */
		s390_cs (code, s390_r0, status_reg, sync_reg, status_offset);
		/* if not successful, jump to actual trampoline */
		s390_jnz (code, 0); CODEPTR(code, jump_cs_failed);
		s390_br  (code, s390_r14);

		/* next case: synchronization->nest is not 1 */
		PTRSLOT (code, jump_next);
		/* decrease synchronization->nest and return */
		s390_lgf (code, s390_r0, 0, sync_reg, nest_offset);
		s390_ahi (code, s390_r0, -1);
		s390_st  (code, s390_r0, 0, sync_reg, nest_offset);
		s390_br  (code, s390_r14);

		PTRSLOT (code, jump_obj_null);
		if (jump_sync_thin_hash)
			PTRSLOT (code, jump_sync_thin_hash);
		PTRSLOT (code, jump_have_waiters);
		PTRSLOT (code, jump_not_owned);
		PTRSLOT (code, jump_cs_failed);
		PTRSLOT (code, jump_sync_null);
	}

	/* jump to the actual trampoline */
	tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_MONITOR_EXIT, mono_get_root_domain (), NULL);

	S390_SET (code, s390_r1, tramp);
	s390_br (code, s390_r1);

	mono_arch_flush_icache (code, code - buf);
	mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_MONITOR, NULL);
	g_assert (code - buf <= tramp_size);

	if (info)
		*info = mono_tramp_info_create ("monitor_exit_trampoline", buf, code - buf, ji, unwind_ops);

	return buf;
}
예제 #3
0
gpointer
mono_arch_create_monitor_enter_trampoline (MonoTrampInfo **info, gboolean is_v4, gboolean aot)
{
	guint8	*tramp,
		*code, *buf;
	gint16	*jump_obj_null, 
		*jump_sync_null, 
		*jump_cs_failed, 
		*jump_other_owner, 
		*jump_tid, 
		*jump_sync_thin_hash = NULL,
		*jump_lock_taken_true = NULL;
	int tramp_size,
	    status_reg = s390_r0,
	    lock_taken_reg = s390_r1,
	    obj_reg = s390_r2,
	    sync_reg = s390_r3,
	    tid_reg = s390_r4,
	    status_offset,
	    nest_offset;
	MonoJumpInfo *ji = NULL;
	GSList *unwind_ops = NULL;

	g_assert (MONO_ARCH_MONITOR_OBJECT_REG == obj_reg);
#ifdef MONO_ARCH_MONITOR_LOCK_TAKEN_REG
	g_assert (MONO_ARCH_MONITOR_LOCK_TAKEN_REG == lock_taken_reg);
#else
	g_assert (!is_v4);
#endif

	mono_monitor_threads_sync_members_offset (&status_offset, &nest_offset);
	g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (status_offset) == sizeof (guint32));
	g_assert (MONO_THREADS_SYNC_MEMBER_SIZE (nest_offset) == sizeof (guint32));
	status_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (status_offset);
	nest_offset = MONO_THREADS_SYNC_MEMBER_OFFSET (nest_offset);

	tramp_size = 160;

	code = buf = mono_global_codeman_reserve (tramp_size);

	unwind_ops = mono_arch_get_cie_program ();

	if (mono_thread_get_tls_offset () != -1) {
		/* MonoObject* obj is in obj_reg */
		/* is obj null? */
		s390_ltgr (code, obj_reg, obj_reg);
		/* if yes, jump to actual trampoline */
		s390_jz (code, 0); CODEPTR(code, jump_obj_null);

		if (is_v4) {
			s390_cli (code, lock_taken_reg, 0, 1);
			/* if *lock_taken is 1, jump to actual trampoline */
			s390_je (code, 0); CODEPTR(code, jump_lock_taken_true);
		}

		/* load obj->synchronization to sync_reg */
		s390_lg (code, sync_reg, 0, obj_reg, MONO_STRUCT_OFFSET (MonoObject, synchronisation));

		if (mono_gc_is_moving ()) {
			/*if bit zero is set it's a thin hash*/
			s390_tmll (code, sync_reg, 1);
			s390_jo  (code, 0); CODEPTR(code, jump_sync_thin_hash);

			/* Clear bits used by the gc */
			s390_nill (code, sync_reg, ~0x3);
		}

		/* is synchronization null? */
		s390_ltgr (code, sync_reg, sync_reg);
		/* if yes, jump to actual trampoline */
		s390_jz (code, 0); CODEPTR(code, jump_sync_null);

		/* load MonoInternalThread* into tid_reg */
		s390_ear (code, s390_r5, 0);
		s390_sllg(code, s390_r5, s390_r5, 0, 32);
		s390_ear (code, s390_r5, 1);
		/* load tid */
		s390_lg  (code, tid_reg, 0, s390_r5, mono_thread_get_tls_offset ());
		s390_lgf (code, tid_reg, 0, tid_reg, MONO_STRUCT_OFFSET (MonoInternalThread, small_id));

		/* is synchronization->owner free */
		s390_lgf  (code, status_reg, 0, sync_reg, status_offset);
		s390_nilf (code, status_reg, OWNER_MASK);
		/* if not, jump to next case */
		s390_jnz  (code, 0); CODEPTR(code, jump_tid);

		/* if yes, try a compare-exchange with the TID */
		/* Form new status in tid_reg */
		s390_xr (code, tid_reg, status_reg);
		/* compare and exchange */
		s390_cs (code, status_reg, tid_reg, sync_reg, status_offset);
		s390_jnz (code, 0); CODEPTR(code, jump_cs_failed);
		/* if successful, return */
		if (is_v4)
			s390_mvi (code, lock_taken_reg, 0, 1);
		s390_br (code, s390_r14);

		/* next case: synchronization->owner is not null */
		PTRSLOT(code, jump_tid);
		/* is synchronization->owner == TID? */
		s390_nilf (code, status_reg, OWNER_MASK);
		s390_cr (code, status_reg, tid_reg);
		/* if not, jump to actual trampoline */
		s390_jnz (code, 0); CODEPTR(code, jump_other_owner);
		/* if yes, increment nest */
		s390_lgf (code, s390_r5, 0, sync_reg, nest_offset);
		s390_ahi (code, s390_r5, 1);
		s390_st  (code, s390_r5, 0, sync_reg, nest_offset);
		/* return */
		if (is_v4)
			s390_mvi (code, lock_taken_reg, 0, 1);
		s390_br (code, s390_r14);

		PTRSLOT (code, jump_obj_null);
		if (jump_sync_thin_hash)
			PTRSLOT (code, jump_sync_thin_hash);
		PTRSLOT (code, jump_sync_null);
		PTRSLOT (code, jump_cs_failed);
		PTRSLOT (code, jump_other_owner);
		if (is_v4)
			PTRSLOT (code, jump_lock_taken_true);
	}

	/* jump to the actual trampoline */
	if (is_v4)
		tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_MONITOR_ENTER_V4, mono_get_root_domain (), NULL);
	else
		tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_MONITOR_ENTER, mono_get_root_domain (), NULL);

	/* jump to the actual trampoline */
	S390_SET (code, s390_r1, tramp);
	s390_br (code, s390_r1);

	mono_arch_flush_icache (code, code - buf);
	mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_MONITOR, NULL);
	g_assert (code - buf <= tramp_size);

	if (info) {
		if (is_v4)
			*info = mono_tramp_info_create ("monitor_enter_v4_trampoline", buf, code - buf, ji, unwind_ops);
		else
			*info = mono_tramp_info_create ("monitor_enter_trampoline", buf, code - buf, ji, unwind_ops);
	}

	return buf;
}