2413 // for GC.
2414 // - Thread A is resumed to finish this native method, but doesn't block
2415 // here since it didn't see any synchronization in progress, and escapes.
2416
2417 // Transition from _thread_in_native to _thread_in_native_trans.
2418 __ li(R0, _thread_in_native_trans);
2419 __ release();
2420 // TODO: PPC port assert(4 == JavaThread::sz_thread_state(), "unexpected field size");
2421 __ stw(R0, thread_(thread_state));
2422
2423
2424 // Must we block?
2425 // --------------------------------------------------------------------------
2426
2427 // Block, if necessary, before resuming in _thread_in_Java state.
2428 // In order for GC to work, don't clear the last_Java_sp until after blocking.
2429 Label after_transition;
2430 {
2431 Label no_block, sync;
2432
2433 if (os::is_MP()) {
2434 if (UseMembar) {
2435 // Force this write out before the read below.
2436 __ fence();
2437 } else {
2438 // Write serialization page so VM thread can do a pseudo remote membar.
2439 // We use the current thread pointer to calculate a thread specific
2440 // offset to write to within the page. This minimizes bus traffic
2441 // due to cache line collision.
2442 __ serialize_memory(R16_thread, r_temp_4, r_temp_5);
2443 }
2444 }
2445
2446 Register sync_state_addr = r_temp_4;
2447 Register sync_state = r_temp_5;
2448 Register suspend_flags = r_temp_6;
2449
2450 // No synchronization in progress nor yet synchronized
2451 // (cmp-br-isync on one path, release (same as acquire on PPC64) on the other path).
2452 __ safepoint_poll(sync, sync_state);
2453
2454 // Not suspended.
2455 // TODO: PPC port assert(4 == Thread::sz_suspend_flags(), "unexpected field size");
2456 __ lwz(suspend_flags, thread_(suspend_flags));
2457 __ cmpwi(CCR1, suspend_flags, 0);
2458 __ beq(CCR1, no_block);
2459
2460 // Block. Save any potential method result value before the operation and
2461 // use a leaf call to leave the last_Java_frame setup undisturbed. Doing this
2462 // lets us share the oopMap we used when we went native rather than create
2463 // a distinct one for this pc.
|
2413 // for GC.
2414 // - Thread A is resumed to finish this native method, but doesn't block
2415 // here since it didn't see any synchronization in progress, and escapes.
2416
2417 // Transition from _thread_in_native to _thread_in_native_trans.
2418 __ li(R0, _thread_in_native_trans);
2419 __ release();
2420 // TODO: PPC port assert(4 == JavaThread::sz_thread_state(), "unexpected field size");
2421 __ stw(R0, thread_(thread_state));
2422
2423
2424 // Must we block?
2425 // --------------------------------------------------------------------------
2426
2427 // Block, if necessary, before resuming in _thread_in_Java state.
2428 // In order for GC to work, don't clear the last_Java_sp until after blocking.
2429 Label after_transition;
2430 {
2431 Label no_block, sync;
2432
2433 if (UseMembar) {
2434 // Force this write out before the read below.
2435 __ fence();
2436 } else {
2437 // Write serialization page so VM thread can do a pseudo remote membar.
2438 // We use the current thread pointer to calculate a thread specific
2439 // offset to write to within the page. This minimizes bus traffic
2440 // due to cache line collision.
2441 __ serialize_memory(R16_thread, r_temp_4, r_temp_5);
2442 }
2443
2444 Register sync_state_addr = r_temp_4;
2445 Register sync_state = r_temp_5;
2446 Register suspend_flags = r_temp_6;
2447
2448 // No synchronization in progress nor yet synchronized
2449 // (cmp-br-isync on one path, release (same as acquire on PPC64) on the other path).
2450 __ safepoint_poll(sync, sync_state);
2451
2452 // Not suspended.
2453 // TODO: PPC port assert(4 == Thread::sz_suspend_flags(), "unexpected field size");
2454 __ lwz(suspend_flags, thread_(suspend_flags));
2455 __ cmpwi(CCR1, suspend_flags, 0);
2456 __ beq(CCR1, no_block);
2457
2458 // Block. Save any potential method result value before the operation and
2459 // use a leaf call to leave the last_Java_frame setup undisturbed. Doing this
2460 // lets us share the oopMap we used when we went native rather than create
2461 // a distinct one for this pc.
|