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;
}
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;
}
